• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Method for preventing condensate in the oil of an oil-injected compressor (1), characterized in that before the compressor element (2) is shut down, when the maximum pressure (pmax) in the consumer network (16) has been reached, the compressor element is driven further until the temperature (T) of the oil or of freshly compressed gas is lower than a set fixed or calculated minimum value (Tmin) above which no or as little condensate as possible is present in the oil.
    公开号:BE1021804B1
    申请号:E2014/0095
    申请日:2014-02-13
    公开日:2016-01-19
    发明作者:
    申请人:Atlas Copco Airpower Naamloze Vennootschap；
    IPC主号:
    专利说明:

    Method for preventing condensate in the oil of an oil-injected compressor and compressor in which such method is applied.
    The present invention relates to a method for preventing condensate in the oil of an oil-injected compressor.
    The invention is more specifically intended for oil-injected compressors with a variable speed.
    Such compressors comprise a compressor element, for example in the form of a screw compressor element with two co-operating rotor screws which are mounted in a housing and which are driven by a variable speed drive that is a function of the load.
    Such compressors are furthermore provided with an oil circuit which is provided for injecting oil into the compressor element for lubricating and cooling the rotor screws and for sealing the play between the rotors themselves and between the rotors and the housing.
    The injected oil leaves the compressor element like a mist of oil droplets in the compressed gas which, before being delivered to a consumer network, is sent through an oil separator to separate and collect the oil present in the compressed gas to extract the oil, being able to inject back into the compressor element after a possible cooling.
    Known compressors of this type include a control for controlling the speed as a function of the requested flow rate and the requested pressure in the downstream consumer network. When the pressure in the consumer network has reached a set value, the aforementioned control causes the compressor element to be shut down according to a specified stop program whereby the speed of the compressor element decreases to a set minimum speed and where, when this minimum speed is reached, the compressor element drive is switched off.
    The compressed gas that leaves the compressor element and is sent through the oil separator also contains a quantity of water vapor in addition to oil droplets.
    A drawback is that there is a risk that if the temperature of the compressed gas at the outlet of the compressor element is not sufficiently high, for example with a low load and when the compressor element is shut down, the water vapor present in the compressed gas starts to condense and to the oil ends up, which can cause damage when the compressor element is restarted.
    The present invention has for its object to provide a solution to the aforementioned disadvantage and other disadvantages.
    To this end the invention relates to a method for preventing condensate in the oil of an oil-injected compressor comprising an oil-injected compressor element with an inlet that can be closed by means of a controlled inlet valve and an outlet; a drive for the compressor element; an oil circuit comprising an oil separator with an input connected to the outlet of the compressor element and an output to which a consumer network for compressed gas can be connected, which oil separator contains a pressure vessel in which the oil separated from the compressed gas is collected and from which oil enters the compressor element can be injected; a control for the drive of the compressor element which is such that, when the pressure in the consumer network reaches a set maximum value, the drive of the compressor element is stopped according to a set stop program, characterized in that before the drive of the compressor element is stopped when the maximum pressure in the consumer network has been reached, the method comprises the following steps, - determining the temperature of the compressed gas or of the oil; - when this temperature is higher than a set fixed or calculated minimum value in order to prevent condensate in the oil as much as possible, to stop the compressor element drive according to the set stop program; - when this temperature is lower than the aforementioned set fixed or calculated minimum value, not immediately stopping the drive but, according to a recirculation program, continuing to drive the control with an open inlet valve to continue compressing gas and compressing this compressed gas from the oil separator via to recirculate a recirculation line to the inlet of the compressor element to raise the temperature until the aforementioned minimum temperature is reached and then stop the drive, possibly after a set minimum duration and / or with a possible stop delay according to the set driver program or after a set maximum duration if the minimum temperature after this maximum duration would not have been reached.
    Thanks to this method, the compressor element is not immediately stopped when the set operating pressure in the consumer network is reached as is usually the case, but first it is checked whether the temperature of the oil in the pressure vessel is sufficient to have no condensate in the oil and if the temperature is insufficient, first a recirculation program is completed during which the compressor element continues to run at a minimum speed to continue compressing gas which after compression is diverted from the pressure vessel to the inlet of the compressor element to be compressed again therefrom.
    Thus, during the recirculation program, the same gas is always compressed again and circulated in a circle over the pressure vessel, as a result of which the compressed gas is heated and thus also the oil in the pressure vessel.
    When the oil has warmed up sufficiently to allow all the moisture in the oil to evaporate, the stop program is completed to shut down the compressor in the usual way, possibly with a certain delay during which the compressor element continues to run in recirculation to ensure homogeneous heating of the oil.
    The fact that the oil is sufficiently heated is in practice the easiest evaluated on the basis of the temperature of the compressed gas that is measured or determined at the outlet of the compressor element, which temperature is a good indication of the temperature of the oil in the pressure vessel.
    The minimum temperature above which there is no longer any danger for condensate in the oil mainly depends on the condensation temperature. The higher the set minimum temperature, the smaller the risk of condensate being present in the oil.
    The value of the minimum temperature is in any case set to a fixed or calculated value that is lower than the temperature at which the thermostatic valve is usually set and which ensures that when the oil is cold, for example at start-up, the oil is directly is injected into the compressor element and when the oil is warm, the oil from the pressure vessel is first passed around an oil cooler.
    In practice, this means that a minimum temperature is set that is as high as possible but lower than the temperature of the thermostat valve, at least insofar as a thermostat is present, which temperature is in practice between 60 ° C and 90 ° C, for example around 70 ° C.
    The minimum temperature can also be determined in real time based on the condensing temperature that can be calculated in real time, for example, based on the measured ambient temperature and relative humidity.
    A built-in safety of the recirculation program ensures that if the desired minimum temperature cannot be reached, the compressor is still stopped after a set minimum duration.
    Another protection ensures that if the oil is heated up too quickly during the recirculation program, the drive is immediately stopped when a set maximum temperature is reached.
    Preferably during the recirculation program the compressed gas is recirculated over a calibrated throttle in order to obtain a pressure in the pressure vessel which is lower than the pressure on which the minimum pressure valve of the pressure vessel is adjusted in order to prevent compressed gas from being supplied to the consumer network at this stage. on the one hand, and that a minimum internal pressure is guaranteed for oil injection to the compressor element, on the other.
    After the recirculation program has been completed, the recirculation line is closed again and the drive is stopped after a set stop delay, this stop delay ensuring that sufficient pressure is built up in the pressure vessel that is necessary for controlling the inlet valve as usual.
    The invention also relates to a compressor adapted to carry out the method of the invention, comprising an oil-injected compressor element with an inlet that can be closed by means of a controlled inlet valve and an outlet; a drive for the compressor element; an oil circuit comprising an oil separator with an input connected to the outlet of the compressor element and an output to which a consumer network for compressed gas can be connected, which oil separator contains a pressure vessel in which the oil separated from the compressed gas is collected and from which oil enters the compressor element can be injected via an injection line; a pressure sensor for determining the pressure in the consumer network and a control for the drive of the compressor element which is such that when the pressure in the consumer network reaches a set maximum value, the drive of the compressor element is stopped according to a set stop program, with characterized in that the compressor is provided with a temperature probe for determining the temperature of the compressed gas or of the oil and with a so-called recirculation line which connects the oil separator to the inlet of the compressor element and in which a throttle and a controlled normally closed lockable recirculation valve is included which is connected to the aforementioned control which is such that before the compressor element drive is stopped when the maximum pressure in the consumer network is reached, the recirculation valve opens when the temperature determined by the temperature probe is lower than a set fixed or calculated min imum value and the drive is driven further until the temperature reaches the minimum value or a set maximum duration has elapsed to then stop the drive with a possible delay.
    With the insight to better demonstrate the characteristics of the invention, a preferred application of a method according to the invention for preventing condensate in the oil of an oil-injected compressor and of such compressor is described below as an example without any limiting character. this method is used, in which: figure 1 schematically represents an oil-injected compressor according to the invention during standstill; Figure 2 shows the stop program of a classic oil-injected compressor; figure 3 represents an analog diagram like that of figure 2, but for a compressor according to the invention; Figure 4 shows the compressor of Figure 1 during a state of use; Figure 5 shows a variant of the diagram of Figure 3.
    The installation shown in Figure 1 relates to an oil-injected screw compressor 1 according to the invention, comprising a compressor element 2 of the known screw type with a housing 3 in which two co-operating helical rotors 4 are driven by means of a drive 5.
    The compressor element 2 is provided with an inlet 6 which can be closed by means of a controllable inlet valve 7, which inlet 6 is connected by means of a suction line 8 to an inlet filter 9 for sucking gas, in this case air from the environment.
    The compressor element 2 is also provided with an outlet 10 and subsequently a pressure line 11 which is connected via a pressure vessel 12 of an oil separator 13 and via a pressure line 14 and a cooler 15 to a downstream consumer network 16 for supplying various pneumatic tools or those that are not shown here.
    A minimum pressure valve 17 is provided in the pressure line 14 at the outlet of the pressure vessel 12, which valve valve only opens when the pressure in the pressure vessel 12 reaches a set minimum value pmin.
    In the pressure vessel 12, a blow-off branch 18 is provided which opens at the inlet 6 and which can be closed by means of blow-off valve 19 in the form of a spring-activated controllable electro valve which is normally kept closed by means of a spring.
    The screw compressor 1 is provided with an oil circuit 20 for injecting oil 21 from the pressure vessel 12 under the influence of the pressure into the pressure vessel 12 via a delivery pipe 22 into the pressure vessel 12 and injection pipe 23 into the compressor element 2 for lubrication and / or cooling and / or for the seal between the rotors 4 and the rotors 4 and the housing 3.
    The oil 21 that is pushed from the pressure vessel 12 to the injection line 23 can be circulated via an oil filter 24 and thermostat valve 25 via a branch line 26 through an oil cooler 27 to cool the oil 21 from the pressure vessel 12.
    In the example shown, the cooled oil, although not strictly necessary, is passed over the drive 5 before being injected into the compressor element 2, this for cooling this drive 5.
    The drive 5 is in this case a drive with a variable speed n which as a function of the load of the consumer network 16, more particularly as a function of the pressure and the flow of gas taken by the consumer network 16.
    This drive 5 is controlled in known manner by an electrical or electronic control 28 as a function of the aforementioned pressure in the consumer network 16, which pressure is for instance determined by means of a pressure sensor 29 or the like.
    The control 28 also controls the opening and closing of the relief valve 19.
    Characteristic of the invention is that the compressor 1 is additionally equipped with a recirculation line 31 which connects the pressure vessel 12 to the inlet 6 of the compressor element 2 and which can be closed by means of a recirculation valve 31, in this case in the form of a controlled spring-assisted normally closed electrical valve.
    In the recirculation line 30, a calibrated throttle 32 is provided which is designed to have, when the recirculation valve 31 is opened, a pressure in the pressure vessel 12 which is lower than the minimum pressure pmin to which the minimum pressure valve 17 is set.
    This recirculation valve 31 is connected to the control 28 for controlling the recirculation valve 31, mainly as a function of the pressure p measured with the aforementioned pressure sensor 29 and as a function of the temperature T of the compressed gas at or in the outlet 10 of the compressor element 2, which temperature T is for example measured with the aid of a temperature sensor 33 whose signal is fed back to the control 28.
    The method according to the invention can be explained as follows.
    When the drive 5 is started, the compressor 1 is in a starting situation as shown in figure 1, wherein the inlet valve 7 is open and the blow-off valve 19 and the recirculation valve 31 are both in a closed state around the blow-off line 18 and the recirculation line 30. to close. The pressure vessel 12 is then partially filled with oil 21.
    In operation, air with the water vapor present therein is sucked in from the environment via the inlet 8 and compressed in the compressor element 2.
    The pressure in pressure vessel 12 then starts to rise and causes oil 21 to be injected from pressure vessel 12 via injection line 23 into compressor element 2, the oil being directly dependent on the temperature of the oil and on the position of the thermostat valve 25 is sent to the injection line 23 to be diverted via the oil cooler 27. The thermostat valve 25 is adjusted to a temperature T25 of, for example, 70 ° C.
    The oil that is present in the compressed air is separated in the oil separator 13 and collected in the pressure vessel 12.
    As soon as the aforementioned minimum pressure has been reached in the pressure vessel 12 or a sufficient pressure to overcome the back pressure in the consumer network 16, the minimum pressure valve 17 opens and compressed air is supplied to the consumer network after prior cooling in the cooler 15.
    The pressure p in the consumer network is measured with the pressure probe 29, the signal of which is coupled to the control 28.
    As soon as the pressure p in the consumer network reaches a set value pmax, the control 28 gives a signal to stop the drive according to a specified stop program 34.
    In a conventional compressor without recirculation, in that case the speed n of the drive is slowed down to a minimum set speed nmin and the drive is stopped completely as soon as this minimum speed nmin has been reached, whereby this speed is for instance between 0 and 10,000 revolutions per speed. minute, for example 2,100 revolutions per minute.
    This is shown schematically in Figure 2 where after the start-up in step A starting from the situation of Figure 1, in step B the pressure p in the consumer network is measured repetitively or continuously and compared with the set maximum pressure pmax, after which the pressure as soon as p becomes larger than pmax, the stop program in step C is started.
    In the case of the invention, an additional recirculation program 35 is run through between step B and step C, as schematically shown in Figure 3. This recirculation program 35 is thus started as soon as the pressure p becomes equal to pmax.
    During this recirculation program 35, the temperature T is measured continuously or repetitively in step D and compared with the set minimum temperature Tmin above which there is no risk of condensate occurring in the oil.
    When the temperature T is lower than Tmin, the speed of the drive 5 is reduced to the set minimum value nmin and the recirculation valve 21 is opened as shown with step E in the diagram of figure 3.
    This state is shown in Figure 4.
    The compressor element 2 thus continues to compress air at a minimum speed, which compressed air is returned from the pressure vessel 12 via the recirculation line 18 and the throttle 32 to the inlet 6 where it is again sucked in and compressed by the compressor element 2.
    The throttle is calculated that in this phase a pressure is realized in the pressure vessel 12 which is lower than the pressure value pmin to which the minimum pressure valve is set so that no compressed air can escape to the consumer network.
    Thus, the same air is always circulated in a circle as shown with the arrows Q in Figure 4 and is thus sucked in and compressed again and again, whereby the temperature of this air increases and thus also the temperature of the oil 21 in the pressure vessel 12 until when Tmin becomes achieved.
    Once Tmin is reached, step C is taken from step D to start the stop program 34 as with a conventional compressor without recirculation.
    During the stop program, the drive is switched off and the recirculation valve 21 is closed again to return to the starting position.
    The temperature T used for the recirculation program is preferably the temperature of the compressed gas that is measured or determined at the outlet of the compressor element.
    The temperature in the outlet above which there is no or a minimal risk of the presence of condensate in the oil is dependent on the condensation temperature which is dependent on the environmental variables in which the compressor 1 is employed.
    The higher the set temperature Tmin, the smaller the risk. In any case, Tmin must be lower than the temperature T25 at which the thermostat valve 25 is set, at least insofar as a thermostat valve 25 is present, so that the oil is not sent over the oil cooler 27 during the recirculation phase to heat up the oil.
    The minimum temperature Tmin is therefore preferably set as close as possible to the aforementioned temperature T25 at which the thermostat valve 25 is adjusted, for example just below 70 ° C.
    In practice, this temperature Tmin is between 60 ° C and 90 ° C.
    Instead of a thermostat valve 25, the compressor can also be equipped with an electronically controlled mixer, in which case the temperature at which the thermostat valve 25 is set should not be taken into account.
    It is not excluded to measure the temperature at a different location, for example in the oil 21 in the pressure vessel and to set a corresponding Tmin.
    Figure 5 shows a diagram like that of Figure 3, but with additional safety features as explained below.
    A maximum duration tmax of the recirculation program is set in the control 28. As long as the minimum temperature Tmin is not reached, it is checked during a process step F whether the duration of the recirculation program 35 since the start of the recirculation program 35 does not exceed the set maximum duration.
    If the temperature Tmin is not reached within this time period tmax, this may be an indication that the ambient temperature is too low to achieve the desired temperature
    Train to reach or that the cooling capacity of the compressor 1 is too large.
    In that case, after the maximum duration tmax has been reached, the recirculation program is exited and the stop program is immediately switched on to start the stop program, and an error counter f is increased by one, which error counter indicates how many times this condition has occurred.
    The aforementioned maximum duration tmax is, for example, set between 0 and 40 minutes, preferably at approximately 600 seconds.
    If the temperature T during the recirculation program does reach the set value Tmin, then a timer is started from then on which records the time t 'since reaching Tmin and which in step G causes the recirculation program to continue during a set minimum duration t'min before stopping the drive 5 in step C, this to ensure uniform heating of the oil 21 in the pressure vessel 12.
    The aforementioned minimum time period t-min is set, for example, between 0 and 60 seconds, preferably at approximately 10 seconds.
    The temperature T is also further monitored during the duration t'min and the drive 5 is immediately stopped when a set maximum temperature Tmax is reached or exceeded that is higher than Tmin, in case the temperature T should rise too rapidly and the compressor could not be stopped in time. This is shown with step H in Figure 5.
    For example, the set maximum temperature Tmax is set to a value that is between 5 ° C and 20 ° C higher than the aforementioned set minimum temperature Tmin, preferably to a value that is approximately 10 ° C higher than this set minimum temperature Tmin and so for example at 80 ° C.
    At the end of the recirculation program 35, the recirculation valve 31 is closed before starting the stopping program 34.
    During a stop program 34, according to a certain aspect of the invention, the drive 5 can only be switched off with a certain stop delay At after the recirculation valve 31 has been closed. The drive 5 then continues to rotate further during this stop delay At at the minimum speed nmin, this delay being between 0 and 40 seconds, for example approximately 2 seconds.
    The purpose of this stop delay At is to ensure that sufficient pressure is built up in the pressure vessel 12 to serve as a control pressure to be able to close the inlet valve 7 as usual.
    According to another aspect of the invention, after closing the recirculation valve 31 and before the drive 5 is switched off, the controller 28 can first check whether the temperature T is higher than the set minimum temperature Tmin and if not the relief valve 19. open to remove the evaporated condensate from the compressor 1.
    An additional protection can be to immediately stop the compressor if the pressure p in the consumer network 16 rises above a set value pstop that is set higher than the aforementioned value pmax, which can occur, for example, when the recirculation valve 31 is blocked, in which case the air will not be able to be recirculated and will therefore be able to escape via the minimum pressure valve 17 to the consumer network, as a result of which the pressure p in the consumer network 16 may inadvertently rise above pmax.
    Although in the examples described above there is always talk of a compressor element 2 with a variable speed drive 5, the invention is also applicable to compressor elements 2 with a fixed speed.
    The present invention is by no means limited to the embodiment described by way of example and shown in the figures, but a method and a compressor according to the invention can be realized in all kinds of variants without departing from the scope of the invention.
    权利要求:
    Claims (17)
    [1]
    Conclusions.
    Method for preventing condensate in the oil of an oil-injected compressor (1) containing an oil-injected compressor element (2) with an inlet (6) that can be closed by means of a controlled inlet valve (7) and an outlet (10) ; a drive (5) for the compressor element (2); an oil circuit (20) comprising an oil separator (13) with an input connected to the outlet (10) of the compressor element (2) and an output to which a consumer network (16) for compressed gas can be connected, which oil separator (13) contains a pressure vessel (12) in which the oil (21) separated from the compressed gas is collected and from which oil can be injected into the compressor element (2); a control (28) for the drive of the compressor element (2) which is such that when the pressure (p) in the consumer network (16) reaches a set maximum value (pmax), the drive (5) of the compressor element (2) ) is stopped according to a set stop program (34), characterized in that before the drive (5) of the compressor element (2) is stopped when the maximum pressure (pmax) in the consumer network (16) is reached, the method follows the following steps comprises: - determining the temperature (T) of the compressed gas or of the oil; - when this temperature (T) is higher than a set fixed or calculated minimum value (Tmin) in order to prevent condensate in the oil as much as possible, to have the drive (5) of the compressor element (2) shut down according to the set stop program ( 34); - if this temperature (T) is lower than the aforementioned set fixed or calculated minimum value (Tmin), do not immediately stop the drive (5) but continue to drive the controller (28) with a recirculation program (35) with a open inlet valve (7) to continue compressing gas and recirculating this compressed gas from the oil separator (13) via a recirculation line (30) to the inlet (7) of the compressor element (2) to raise the temperature ((T) until the aforementioned fixed or calculated minimum temperature (Tmin) is reached in order to then stop the drive (5), possibly after a set minimum duration (t'min) and / or with a possible stop delay, according to the set stop program (34) ) or after a set maximum duration (tmax) if the minimum temperature (Tmin) after this maximum duration (tmax) would not have been reached.
    [2]
    Method according to claim 1, characterized in that when the recirculation program (35) is running, the temperature (T) of the compressed gas or of the oil does not reach the required minimum temperature (Tmin) after the aforementioned maximum duration (tmax) ), the stop program (34) is executed.
    [3]
    Method according to claim 1 or 2, characterized in that if during the execution of the recirculation program (35) the temperature (T) of the compressed gas or of the oil does not reach the required minimum temperature (Tmin) after the aforementioned maximum duration (tmax), the stop program (34) is executed and an error counter (f) is increased which indicates how many times this condition has occurred.
    [4]
    Method according to one of the preceding claims, characterized in that the aforementioned minimum duration (t-min) is set between 0 and 60 seconds, preferably at approximately 10 seconds.
    [5]
    Method according to one of the preceding claims, characterized in that the aforementioned maximum duration (t max) is set between 0 and 40 minutes, preferably at approximately 600 seconds.
    [6]
    Method according to one of the preceding claims, characterized in that the oil separator (13) is provided with a minimum pressure valve (17) which is set to a minimum pressure value (pmin) and that the pressure in the pressure vessel during the recirculation program (35) is controlled at a value lower than the pressure value (pmin) to which the minimum pressure valve (17) is set.
    [7]
    Method according to claim 6, characterized in that, for controlling the pressure in the oil separator (13) below the adjusted pressure value (pmin) of the minimum pressure valve (17), the compressed gas of the oil separator (13) is passed through a recirculated calibrated throttle (32) to the inlet (7) of the compressor element (2).
    [8]
    Method according to one of the preceding claims, characterized in that during the execution of the recirculation program (35) the drive (5) of the compressor element (2) is immediately stopped when the temperature (T) exceeds a set maximum temperature (Tmax) that is higher than the aforementioned set fixed or calculated minimum value (Tmin) of the temperature.
    [9]
    Method according to one of the preceding claims, characterized in that the set minimum temperature (Tmin) is determined periodically or in real time, based on the condensing temperature calculated on the basis of the measured ambient temperature and relative humidity.
    [10]
    Method according to one of the preceding claims, characterized in that the temperature (T) used for the recirculation program (35) is the temperature of the compressed gas that is measured or determined at the outlet (10) of the compressor element ( 2).
    [11]
    Method according to claim 10, characterized in that the oil is circulated by means of a thermostatic valve (25) in the oil circuit (20) via an oil cooler (27) when the temperature of the oil exceeds the temperature (T25) at which the thermostat valve (25) is adjusted and that the set minimum temperature (Tmin) is below this temperature (T25) at which the thermostat valve (25) is set, preferably as close as possible to this temperature (T25) at which the thermostat valve ( 25) is adjusted, for example around 7 0 ° C.
    [12]
    Method according to claim 11, characterized in that the set maximum temperature (Tmax) is between 5 ° C and 20 ° C higher than the aforementioned set fixed or calculated minimum temperature (Tmin), preferably about 10 ° C higher than this set minimum temperature (Tmin).
    [13]
    Method according to one of the preceding claims, characterized in that the drive (5) of the compressor element (2) is a variable speed (n) drive and that during the recirculation program (35) the speed (n) is reduced to a set minimum value (nmin) that is between 0 and 10,000 revolutions per minute, preferably up to approximately 2,100 revolutions per minute.
    [14]
    Method according to one of the preceding claims, characterized in that after the recirculation program (35) has been carried out, the recirculation line (30) is closed and then the drive (5) is switched off with a certain stop delay (At), whereby this stop delay (At) is between 0 and 40 seconds, more preferably about 2 seconds.
    [15]
    Method according to claim 14, characterized in that the compressor (1) is provided with a closable blow-off branch (18) in order to be able to blow off the compressed gas from the oil separator (13) freely in the environment and that after stopping the drive (5) in a subsequent step it is checked whether the temperature (T) of the compressed gas or of the oil is higher than the set minimum value (Tmin) and if not, that the blow-off branch (18) is opened to blow off gas .
    [16]
    Method according to one of the preceding claims, characterized in that, when the maximum pressure value in the consumer network is reached, the stop program (34) consists of reducing the speed (s) of compressor element (2) to a set minimum value (nmin), after which, insofar as the temperature (T) of the compressed gas or of the oil is higher than the set fixed or calculated minimum value (Tmin), the drive (5) is switched off.
    [17]
    17. - Oil-injected compressor comprising an oil-injected compressor element (2) with an inlet (6) that can be closed by means of a controlled inlet valve (7) and an outlet (10); a drive (5) for the compressor element (2); an oil circuit (20) comprising an oil separator (13) with an input connected to the outlet (10) of the compressor element (2) and an output to which a compressed gas consumer network (16) can be connected, which oil separator (13) contains a pressure vessel (12) in which the oil (21) separated from the compressed gas is collected and from which oil can be injected into the compressor element (2) via an injection line (23); a pressure sensor (29) for determining the pressure (p) in the consumer network (16) and a control (28) for the drive (5) of the compressor element (2) which is such that when the pressure (p) in the consumer network (16) reaches a set maximum value (pmax), the drive (5) of the compressor element (2) is stopped according to a set stop program (34), characterized in that the compressor (1) is provided with a temperature probe (33 ) for determining the temperature (T) of the compressed gas or of the oil and of a so-called recirculation line (30) connecting the oil separator (13) to the inlet (6) of the compressor element (2) and in which a throttle ( 32) and a controlled normally closed lockable recirculation valve (31) is included which is connected to the aforementioned control (28) such that before the drive (5) of the compressor element (2) is stopped when the maximum pressure (pmax) in the consumer network (16) has been reached, the reci The circulation valve (31) opens when the temperature (T) determined with the temperature probe (33) is lower than a set minimum value (Tmin) and the drive (5) is driven further until the temperature (T) reaches the minimum value (Tmin) or a set maximum duration (tmax) has elapsed to then stop the drive (5) with a possible delay (t'min).
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    法律状态:
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    申请号 | 申请日 | 专利标题
    US201461925902P| true| 2014-01-10|2014-01-10|
    US61925902|2014-01-10|CN201410759409.1A| CN104776028B|2014-01-10|2014-12-11|The method and the compressor of application this method condensed in the oil of anti-spraying oil formula compressor|
    CN201420780153.8U| CN204783653U|2014-01-10|2014-12-11|Oil spout formula compressor|
    EP15710412.6A| EP3092411B1|2014-01-10|2015-01-08|Method for preventing condensate in the oil of an oil-injected compressor and compressor in which such a method is applied|
    EP21174028.7A| EP3889433A1|2014-01-10|2015-01-08|Method for preventing condensate in the oil of an oil-injected compressor and compressor in which such a method is applied|
    US15/110,436| US10550844B2|2014-01-10|2015-01-08|Method for preventing condensate in the oil of an oil-injected compressor and compressor in which such a method is applied|
    PCT/BE2015/000002| WO2015103678A1|2014-01-10|2015-01-08|Method for preventing condensate in the oil of an oil-injected compressor and compressor in which such a method is applied|
    KR1020167021765A| KR101981847B1|2014-01-10|2015-01-08|Method for preventing condensate in the oil of an oil-injected compressor and compressor in which such a method is applied|
    ES15710412T| ES2743242T3|2014-01-10|2015-01-08|Method to prevent the presence of condensate in the oil of a compressor with oil injection and the compressor in which such a method is applied.|
    JP2016545791A| JP6543634B2|2014-01-10|2015-01-08|Method for preventing condensation in oil of oil jet compressor and compressor to which the method is applied|
    BR112016015793-1A| BR112016015793A2|2014-01-10|2015-01-08|METHOD TO AVOID CONDENSATE IN THE OIL OF A COMPRESSOR WITH OIL INJECTION AND COMPRESSOR IN WHICH SUCH METHOD IS APPLIED.|
    ES19164967T| ES2888652T3|2014-01-10|2015-01-08|Method for preventing the presence of condensate in the oil of an oil-injected compressor and the compressor to which such a method is applied|
    EP19164967.2A| EP3534008B1|2014-01-10|2015-01-08|Method for preventing condensate in the oil of an oil-injected compressor and compressor in wich such a method is applied|
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