• 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:
    System comprising two or more pumps connected in parallel and pressure switch designed to operate in said system. System with two pumps (b1, b2) connected in parallel to a discharge manifold (1) and two electronic pressure switches (p1, p2) equipped with a pressure sensor (s1, s2) connected to the discharge manifold (1) configured for alternate its operation between a first configuration with a first shutdown pressure (pmax1) and a first ignition pressure (pmin1) and a second configuration with a second shutdown pressure (pmax2) and a second ignition pressure (pmin2), the first shut-off pressure (pmax1) greater than the second shut-down pressure (pmax2) and the first ignition pressure (pmin1) greater than the second ignition pressure (pmin2). Each of the pressure switches (p1, p2) is configured to alternate its operation between the two configurations as a function of a pressure reading (pimp) in the discharge manifold with the pressure sensor (s) (s1, s2). It also refers to a pressure switch. (Machine-translation by Google Translate, not legally binding)
    公开号:ES2620685A1
    申请号:ES201631347
    申请日:2016-10-18
    公开日:2017-06-29
    发明作者:Fernando BANÚS GARCÍA；Jaume BUCH LLORACH；Àngel ANDRÉS CASTELLANO
    申请人:Coelbo Control System S L；Coelbo Control System SL；
    IPC主号:
    专利说明:

    SYSTEM THAT INCLUDES TWO OR MORE PUMPS CONNECTED IN PARALLEL AND PRESSURE CONCEPTED TO OPERATE IN SUCH SYSTEM
    Field of the Invention
    The present invention relates to the control of a pressure group provided with two or more pumps and their respective pressure switches, and is intended to ensure optimum control and lifetime of the system.
    Background of the invention
    The systems provided with two or more pumps connected in parallel are known, a discharge manifold to which the pump outputs are connected, which comprises for the control of the operation of each
    15 pump two pressure switches equipped with means to measure the pressure in the discharge manifold. In the case of mechanical pressure switches the pressure is detected mechanically in the pressure switch itself, while in the case of an electronic pressure switch, it comprises a pressure sensor and an actuating relay.
    These systems are designed to meet demand when it has consumption peaks, since it is more efficient in terms of operation and costs to have two smaller pumps, which can operate in optimal conditions, instead of only one that most of the time would be underused
    This implies, however, greater needs in terms of its control.
    25 In particular, it should be provided that the pressure switches have different settings of pressure on and off, and in particular, one of the pumps must have a first on and a first off pressure, while the other has a second ignition pressure and a second shut-off pressure, the first shut-off pressure being greater than the second shut-off pressure and the first ignition pressure being greater than the second ignition pressure, as shown in the figure
    30 1.
    As is known, the pumps usually operate with a boiler also connected to the discharge manifold, and the different on and off pressures guarantee the stability of the system.
    35 What happens is the following. It is assumed that the system is at rest at a pressure between the upper shut-off pressure (Pmax1) of the pumps and the upper ignition pressure (Pmin1). When a demand for water occurs, the pressure in the discharge manifold begins to drop. With a boiler, the pressure drop is softer than if there was not. When the first ignition pressure (Pmin1) is reached, the first pump is started
    40 Then it can happen that the flow of this first pump is higher than the consumption caused by its start-up, so that the pressure in the drive tends to increase, the boiler is refilled, and the shut-off pressure is reached of the first bomb. In other words, what would happen if there was only one pump, and the second pump has not come to work (figure 2)
    45 Or it may happen that the flow rate of the first pump is not sufficient to meet the demand and that the pressure continues to decrease until the second ignition pressure (Pmin2) is reached, so that the second pump is put into operation. In this case, if the system is correctly sized to respond to the demand peaks, the demand can be satisfied with the two pumps and refill the
    50 boiler During the rise of the pressure in the manifold, the second shutdown pressure (Pmax2) will first be reached, at which point the second pump will be shut down, and then the first shutdown pressure (Pmax1) will be reached, at which time the First pump will also shut down. This sequence is illustrated in Figure 3.
    55 The system just described, in which both mechanical and electronic pressure switches can be used, involves very simple programming, by setting the four limit pressures.
    However, it has the obvious disadvantage that the first pump will work much more frequently than the other, so that the system is not optimal from a component duration point of view, since very
    60 the first bomb will probably fail long before the second.
    In order to respond to this problem, two solutions have been proposed, the first consisting of connecting the pumps or pressure switches to a common central unit and the second one involving the use of independent electronic pressure switches equipped with means of communication with each other. Both solutions are complex, as the first
    65 implies arranging a synchronization center, while the other implies connecting the pressure switches to each other. With both systems, the pump configurations can be alternated so that they end up supporting a
    similar workload.
    The inventors consider these solutions to be expensive
    Description of the invention
    To respond to the shortcomings of the state of the art, the present invention proposes a system comprising at least two pumps connected in parallel, a discharge manifold to which the outputs of the two or more pumps are connected, which comprises for control of operation of each pump two electronic pressure switches equipped with a pressure sensor connected to the discharge manifold, in which the pressure switches are configured to alternate their operation between at least two co-configurations of pressure on and off, namely:
    - a first configuration with a first off pressure and a first on pressure; -a second co-configuration with a second off pressure and a second on pressure;
    in which the first shut-off pressure is greater than the second shut-off pressure and in which the first ignition pressure is greater than the second ignition pressure, in which the pressure switches are configured to perform said alternation based on a reading pressure in the impulse manifold J with the pressure sensor (s)
    Through these characteristics, it is possible to properly alternate the operation of two or more pumps, and ensure that each of them has a similar cumulative workload, which increases the life of the system. With respect to the known, a system based on a communication between pressure switches, whether or not using an intermediate exchange, is replaced by a system based on the monitoring of the common pressure together with the knowledge of the operating status of each pump by its corresponding pressure switch.
    In particular, in the case of two pumps, each pressure switch will alternate its operation between the first and second pressure on and off.
    In some embodiments, the pressure switches are configured to be set to the first configuration or the second configuration when the pressure sensor indicates that the first shutdown pressure has been exceeded a predetermined number of times. Thus, if for any reason one of the pumps starts up for a minimum number of times in a row, the system will automatically assign the system a status that will allow the alternation between pumps to be restarted. In other words, if for some reason, for example due to errors in pressure measurements, or by pressures close to the threshold pressures, the two pumps start to operate simultaneously with the same mode, when it is detected that one of the they exceed a number of start-ups in a row, then it will impose who will work with what pressure limits. The pressure switch that decides on these situations will be called a teacher, and the other is a slave. Obviously, it will be provided that the pressure switches, when configured after installation, can be programmed as a master or as a slave.
    In some embodiments, the system comprises a boiler connected to the discharge manifold. In the vast majority of cases, as usual, the system will have a boiler, which allows to significantly increase the differences between the threshold pressures, and therefore avoid the continuous switching on and off of the pumps
    In some embodiments, each of the pressure switches is provided with a pressure sensor.
    In some embodiments, the system comprises a common housing of the two pressure switches. In other words, the supply of the system pressure switches can be provided as separate units, which will be the most common, or they can be supplied integrated into a single housing, which will facilitate its installation. In this case, it can also be provided that programming is easier, because the device itself can already decide which is the master unit
    The invention also relates to a pressure switch intended to be integrated in a system according to any of the variants described, and which is configured to alternate its operation between two configurations of on / off pressure:
    - a first configuration with a first pressure off and a first pressure on; -a second configuration with a second off pressure and a second on pressure;
    in which the first shut-off pressure is greater than the second shut-off pressure and in which the first ignition pressure is greater than the second ignition pressure, in which the pressure switch is configured to perform said alternation based on a reading pressure in the discharge manifold with the pressure sensor
    8 brief description of the figures
    To complement the description and in order to help a better understanding of the characteristics of the
    The invention, according to an example of practical implementation thereof, is accompanied as an integral part of the description, a set of figures in which the following has been represented by way of illustration and not limitation ·
    Figure 1 is a schematic diagram showing the relationship between the on and off pressures of two pumps arranged to operate in parallel
    Figure 2 shows the temporal evolution of the pressure in a sequence in which a single pump is started.
    Figure 3 shows the temporal evolution of the pressure in a sequence in which the two pumps are turned on.
    Figure 4 shows the temporal evolution of the pressure in a sequence in which the two pumps are turned on and the auxiliary pump stops and starts successively due to variations in consumption
    20 Figure 5 shows a diagram of the installation provided with two pumps
    Figures 6a and 6b show diagrams of embodiments in which the two pressure switches are in the same housing, to facilitate their installation.
    Description of an embodiment of the invention
    As can be seen in Figure 5, according to a preferred embodiment, the invention relates to a system S comprising two pumps 81, 82 connected in parallel, a discharge manifold 1 to which the outputs of the two pumps 81 are connected, 82 And comprising for the operation control of each pump B 1, 82
    30 electronic pressure switches P1, P2. The system is completed with a boiler 2 designed to ensure greater pressure stability, such as a membrane boiler.
    Each pressure switch is provided with a pressure sensor S1, S2 connected to the drive manifold 1, so that they can measure the same pressure, or at most one pressure that will differ in the pressure drop between the two pressure points, If these are different Obviously, it will be ensured that the difference is minimal to ensure the proper functioning of the system.
    In particular, the pressure switches P1, P2 are configured to alternate their operation between two or more pressure settings on Pmax1, Pmax2 and off Pmin1, Pmin2 ·
    - a first configuration with a first Pmax shutdown pressure: 1 and a first ignition pressure Pmin1; -a second configuration with a second Pmax2 shutdown pressure and a second Pmin2 ignition pressure
    Therefore, each of them will alter its state between these two intervals. It should be noted that the numbering 1, 2 after the pressure does not imply that they are associated with one of the pressure switch pump groups, but quite the opposite, each of the pumps will alter its operation between these co-configurations, as will be clarified hereinafter
    As can be seen in Figure 1, the first shutdown pressure Pmax: 1 is greater than the second shutdown pressure Pmax2 and the first ignition pressure Pmin1 is greater than the second ignition pressure Pmin2, which is known in the state of technique
    55 However, the novelty is that the pressure switches P1, P2 are configured to perform said alternation based on a pressure reading Pimp in the drive manifold with the pressure sensor or sensors S1, S2.
    During the initial configuration of the group one of the pressure switches should be designated as a teacher. This pressure switch will be responsible for managing the resynchronization algorithms. The other pressure switch, or the others if the system comprises more than two, will be designated as a slave.
    Regarding the order of start-up of the pumps, the pump operating between Pmax1 and Pm in1 is defined as the main one. The pump operating between Pmax2 and Pmin2 is defined as an aid. If there were more auxiliary pumps, they would be defined following this logic.
    During operation, both the master device and the slave / slaves may be functioning as the main or auxiliary auxiliary due to the alteration.
    The initial configuration, in a group of two pumps, consists in that the first pump 81 is in the state to operate with the first shutdown pressure Pmax1 and the first ignition pressure Pmin1
    5 (master device operating as main) and the second pump is in the state to operate with the second shutdown pressure Pmax2 and the second ignition pressure Pmin2 (slave device operating as auxiliary), the first shutdown pressure Pmax1 being greater than the second shutdown pressure Pmax2 and the first ignition pressure Pmin1 being greater than the second ignition pressure Pmin2. For example, Pmax1 = 3.5 bar, Pmin1 = 2.5 bar, Pmax2 = 3 bar and Pmin2 = 2 bar.
    Then the cases detailed below can be given
    Case 1:
    15 As can be seen in Figure 2, first the pressure in the discharge manifold 1 falls below Pmin 1, which corresponds to t1 This causes the activation of the pump 81 If 81 has sufficient capacity, the pressure in the manifold it will go up to Pmax1, and then 81 will turn off.
    What constitutes the novelty of the invention is that the second pressure switch P2, associated with 82, will be
    20 monitor the pressure in the manifold and you will have verified that the pressure has risen to Pmax1 Therefore, you will know that in the next cycle it should be the first to turn on. For its part, the first pressure switch P1 will know that the Pmax1 pressure switch with 81 in operation has been reached. Then you will know that in the next cycle you should be the second one to light up, if necessary. The change of state settings is represented by arrow 81 ~ 82 at time t2.
    Case 2
    If the first pump 81 has no capacity, the pressure will continue to drop to Pmin2, at which point (12) the pump 82 will be activated. Then the pressure will rise again and if the aggregate flow is sufficient, it will first be reached.
    30 Pmax2 (instant t3), and the second pump 82 will turn off, 81 will continue running until it reaches Pmax1, at which time (instant t4) at which 81 it will shut down. At the top of each time interval it is indicated which pumps are activated. This sequence corresponds to the known case and shown in Figure 3.
    Again, what constitutes the novelty of the invention is that the second pressure switch P2, associated with 82, will be
    35 monitor the pressure in the manifold and you will have verified that the pressure has risen to Pmax1 Therefore, you will know that in the next cycle it should be the first to turn on. For its part, the first pressure switch P1 will know that the pressure Pmax1 has been reached with 81 in operation. Then you will know that in the next cycle you should be the second one to light up, if necessary. The change of state settings is represented by arrow 81 ~ 82 at time t4
    40 Therefore, the pressure switches can be synchronized from the knowledge of the pressure read in the manifold and the knowledge of its operating status. Therefore, it is not necessary according to the invention to resort to a central or a communication system between pressure switches, but the synchronization is carried out by reading a common pressure
    Case 3
    Starting from the situation of case 2 after instant t3 (82 off) if demand reverses its trend and increases again until the pressure drops below Pmin2, pump 2 starts again
    50 as happens in moments t2.n. This situation can last until reaching the conditions of the instant 14 This sequence corresponds to the known case and shown in Figure 4, in which the period of time in which consumption oscillations occur
    Case 4
    55 After completing a cycle in Case 1 or Case 2 and Case 3 the order of start-up of the pumps is reversed, that is, the master device will act as an auxiliary and the slave device as the main In these conditions, if the cycle of work is done under the conditions described in Figure 2 or Figure 3, in
    as for the sequence of pressures and with the new order of pumps, there will be no alteration in the
    60 standard operating logic l.
    Case 5:
    Because the decisions associated with the change of commissioning order are linked to the reading of
    The pressure of each device must be given a margin of tolerance for this reading in case there are small calibration deviations. This tolerance can cause the auxiliary device to misinterpret the main stop. This
    would create an alteration of the alteration causing both devices to work in auxiliary mode
    (desynchronization).
    To solve this problem the master device, after 2 consecutive startups in Pmin2, applies a resynchronization algorithm
    This is an algorithm that detects N (for example two or three) consecutive start-ups of the master pump 10 as an auxiliary
    In particular, the master pump working as an auxiliary after two co-executive ignitions does not turn off
    in Pmax2 as it would correspond, but it stops at Pmax1, which forces the auxiliary pump to reverse
    their order and return both to the state of altemance, that is, as a cycle as described in figure 2
    Although in the above description of preferred embodiments the application of the invention to a system provided with two pumps has been described, it is clear that the invention can be applied to a larger number of pumps, with the relevant changes. If, for example, there is a third pump, a third ignition pressure and a third shutdown pressure must be defined. Regarding the alteration algorithms, it will be used
    20 a cyclical strategy, always with the aim of guaranteeing the same long-term workload of the three pumps.
    Finally, in figures 6a and 6b two embodiments have been shown in which the two pressure switches are presented in a common housing, with two pressure points or only one.
    In this text, the word ~ understands · and its variants (such as ~ understanding ·, etc.) should not be construed as excluding, that is, they do not exclude the possibility that what is described includes other elements, steps, etc.
    On the other hand, the invention is not limited to the specific embodiments described but covers
    30 also, for example, the variants that can be made by the average expert in the field (for example, in terms of the choice of materials, dimensions, components, configuration, etc.), within what follows from the claims .
    权利要求:
    Claims (3)
    [1]
    1.-System (S) comprising two or more pumps (81, 82) connected in parallel, a discharge manifold (1) to which the outputs of the two or more pumps (81, 82) are connected, comprising for the control of
    5 operation of each pump (81, 82) two electronic pressure switches (P1, P2) equipped with pressure sensors (S1, S2) connected to the supply manifold (1), characterized in that the pressure switches (P1, P2) are configured to toggle its operation between two or more pressure settings on (Pmax1, Pmax2) and off (Pmin1, Pmin2)
    10 -a first configuration with a first off pressure (Pmax1) and a first on pressure (Pmin1); -a second configuration with a second shutdown pressure (Pmax2) and a second ignition pressure (Pmin2);
    15 in which the first shutdown pressure (Pmax1) is greater than the second shutdown pressure (Pmax2) and in which the first ignition pressure (Pmin1) is greater than the second ignition pressure (Pmin2), in which the pressure switches (P1, P2) are configured to perform said alternation based on a pressure reading (Pimp) in the discharge manifold with the pressure sensor (s1, S2)
    2. System according to claim 1, wherein the pressure switches (P1, P2) are configured to be set in the first configuration or in the second configuration when the pressure sensor indicates that the first shutdown pressure (Pmax1) has been exceeded a predetermined number of times (N).
    J. System according to any of the preceding claims, comprising a boiler (2) connected to the discharge manifold (1)
    [4]
    4. System according to any of the preceding claims, wherein each of the pressure switches (P1, P2) is provided with a pressure sensor (S1, S2).
    5. System according to any of the preceding claims, comprising a common housing (A) of the two pressure switches (P1, P2)
    [6]
    6. Pressure switch (P1, P2) intended to be integrated in a system according to any of claims 1 to 4, characterized in that it is configured to alter its operation between two pressure settings 35 of shutdown (Pmax1, Pmax2) and on ( Pmin1, Pmin2)
    - a first configuration with a first off pressure (Pmax1) and a first on pressure (Pmin1); a second configuration with a second off pressure (PmalQ) and a second pressure of 40 on (Pmin2);
    in which the first off pressure (Pmax1) is greater than the second off pressure (Pmax2) and in which the first ignition pressure (Pmax1) is greater than the second ignition pressure (Pmax2), in which the pressure switch (P1, P2) is configured to perform said alternation based on a pressure reading
    45 (Pimp) in the discharge manifold with the pressure sensor (S1, S2).
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    法律状态:
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    优先权:
    申请号 | 申请日 | 专利标题
    ES201631347A|ES2620685B1|2016-10-18|2016-10-18|SYSTEM THAT INCLUDES TWO OR MORE PUMPS CONNECTED IN PARALLEL AND PRESSURE CONCEPTED TO OPERATE IN SUCH SYSTEM|ES201631347A| ES2620685B1|2016-10-18|2016-10-18|SYSTEM THAT INCLUDES TWO OR MORE PUMPS CONNECTED IN PARALLEL AND PRESSURE CONCEPTED TO OPERATE IN SUCH SYSTEM|
    CN201780068052.4A| CN110226039B|2016-10-18|2017-10-18|System comprising two or more pumps in parallel and pressure switch for operating in said system|
    US16/342,492| US11041488B2|2016-10-18|2017-10-18|System comprising two or more pumps connected in parallel and a pressure switch conceived to operate in said system|
    MX2019004296A| MX2019004296A|2016-10-18|2017-10-18|System comprising two or more pumps connected in parallel and a pressure switch conceived to operate in said system.|
    PCT/ES2017/070692| WO2018073477A1|2016-10-18|2017-10-18|System comprising two or more pumps connected in parallel and a pressure switch conceived to operate in said system|
    EP17863074.5A| EP3530943A4|2016-10-18|2017-10-18|System comprising two or more pumps connected in parallel and a pressure switch conceived to operate in said system|
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