• 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:
    The present invention relates to an arrangement for controlling the temperature of coolant circulating in a cooling system. The arrangement comprises at least one main thermostat (6, 6a, 6b) which is adapted to direct coolant to a cooler (9) in the cooling system at three times when the coolant has a higher temperature than single control temperature (I 1, TM, T1b) for the main thermostat (6, 6a, 6b). The arrangement comprises an additional thermostat (12, 12a) having a control temperature (TO), which is lower than the control temperature of the main thermostat (6, 6a, 6b) (T1, Th, TW), the additional thermostat (12, 12a) being adapted to conduct a part of the coolant flow that circulates in the cooling system to the radiator (9) in the event of a three-way downturn when the coolant has a higher temperature than the control thermostat (TO) of the additional thermostat. (Fig. 1)
    公开号:SE1051083A1
    申请号:SE1051083
    申请日:2010-10-18
    公开日:2012-04-19
    发明作者:Zoltan Kardos；Marcus Ekman；Viktor Berggren；Tommi Bjoerkbacka
    申请人:Scania Cv Ab；
    IPC主号:
    专利说明:

    101520253035activated. During such times, the coolant temperature can rise very rapidlythe cooling system. Conventional thermostats, which include wax bodies that change phase thenthe control temperature is exceeded, reacts with a certain time delay. The coolantrisks in this case obtaining a clearly higher temperature than that of the thermostatcontrol temperature before the tin state opens. The thermal loads of the radiatorand the connecting devices exposed can result in defects and cracks.
    These units can thus have a reduced service life.
    SUMMARY OF THE INVENTIONThe object of the present invention is to provide an arrangement which regulatescoolant fl fate so that it does not expose the radiator and connecting units to thermalloads of a size so that defects and cracks are likely to occur. Anotherpurpose is to provide an arrangement that can maintain a desired stabilitycoolant temperatures even at times when the cooling system is exposed to large momentsloads.
    These objects are achieved with the arrangement of the kind mentioned at the outset, whichcharacterized by the features specified in the characterizing part of claim 1. According toThe extraction thus uses an extra thermostat that has a lower onecontrol temperature than the main thermostat. The extra thermostat will thusopen and direct a certain amount of coolant aren through the radiator before the main thermostat opens.
    Such an initial fate of coolant results in the radiator and connecting unitsreceives a heating in a first step before the main thermostat opens and healsdet the fate of hot coolant is led to the radiator. Such an initial heating of the radiator andconnecting units reduces the rate at which the material in the units heats upup. The risk of cracks and deformations occurring in the radiator and the connectionsthe units due to a very rapid thermal expansion of the material is thussubstantially eliminated. Another benefit of conducting a certain initial coolant fatethrough the radiator before the main thermostat opens is that the coolant provides a certaincooling. As a result, the coolant temperature rises more slowly before it reachesthe control temperature of the main thermostat. Thus, the main thermostat is not requiredneed to react and open extremely quickly to prevent the coolant from getting onetoo high temperature. During certain operating cases, a desired one may also be requiredcoolant temperature is maintained using the auxiliary thermostat withoutthe main thermostat essentially needs to be opened and closed.101520253035According to an embodiment of the invention, the auxiliary thermostat is adapted to conduct oneless than 50% of the coolant fl fate circulating in the cooling system, with advantage 5 - 20%of coolant fl fate, to the radiator at shit times when the coolant has a highertemperature than the control temperature of the auxiliary thermostat. The extra thermostat leadsthus a less coolant fl destined for the radiator than the main thermostat. What proportion ofThe coolant fate that is suitably controlled by the auxiliary thermostat varies for differentcooling system. In many cooling systems it is advisable that the extra thermostat controls about 10%of coolant fl the fate of the cooling system. The control temperature of the extra thermostat can be3 ° C - 10 ° C lower than the control temperature of the main thermostat. How much lowerThe control temperature that the extra thermostat should have varies for different cooling systems. INmany cooling systems, it is appropriate that the auxiliary thermostat has a control temperaturewhich is about 5 ° C lower than the control temperature of the main thermostat.
    According to another embodiment of the invention, the arrangement comprises parallelarranged pipes leading the coolant to the auxiliary thermostat andthe main thermostat. Said parallel wires can be dimensioned so that aAppropriate distribution of coolant fate to the respective thermostats is obtained. In thisIn this case, the auxiliary thermostat and the main thermostat are arranged in separate thermostat housings.
    All the coolant is thus led to the common thermostat housing. The main statemay comprise a poppet valve provided with a through hole and that itthe extra thermostat is mounted on the poppet valve in connection with the said throughholes where it is adapted to be placed in an open position and conduct coolant, via said holes,to the radiator during dry periods when the coolant has a higher temperature than the extra onethermostat control temperature. In this an arrangement is obtained which essentially does notrequires more space than a conventional thermostat. Alternatively, the main thermostat canand the additional thermostat be arranged in separate thermostat housings.
    According to another preferred embodiment of the invention, the arrangement comprisestwo main thermostats arranged in parallel which have different control temperatures. WithWith the help of two such main thermostats, the coolant flow to the radiator can be regulatedin several steps. When the coolant has a moderately high temperature, one of them opensthe main thermostat. When the coolant has a more than moderately high temperature also opensthe other main state. The higher the temperature of the coolant, the greaterproportion of the coolant is led to the radiator for cooling. Thus, one can be very stablecoolant temperature is maintained even at times when the cooling system is exposed101520253035rapid load variations. Advantageously, the two are arranged in parallelthe main thermostats arranged in a common thermostat housing. The mutualthe thermostat housing is a compact unit. One of the two arranged in parallelthe main thermostats can have a control temperature of 3 - 10 ° C. What a differenceas it should be between the control temperatures of the main thermostats vary too differentlycooling system. In many cooling systems, it is advisable for one main thermostat to have onecontrol temperature which is about 5-7 ° C lower than that of the other main thermostatcontrol temperature.
    According to another preferred embodiment of the invention comprises at least one ofthe thermostats a temperature sensing means in the form of a housing enclosing awax substance 'soin is adapted to the second phase at the thermostat's control temperature. Manywaxes have a melting temperature in the temperature range 60-100 ° C. Cooling system witha circulating coolant usually has a desired control temperature within itinterval. By Selecting a suitable wax substance with any additives canessentially always a phase-changing wax substance with a suitable melting temperatureprovided. The casing is advantageously made of a thin metal material with goodheat-conducting 'properties.
    BRIEF DESCRIPTION OF THE DRAWINGS AIn the following, by way of example, preferred embodiments of the invention are describedwith reference to the accompanying drawings, in which:Fig. 1 shows a cooling system for an internal combustion engine with an arrangement according toin a first embodiment of the invention,Fig. 2 shows an arrangement according to a second embodiment of the invention andFig. 3 shows an arrangement according to a third embodiment of the invention.
    DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS OFTHE INVENTIONFig. 1 shows a cooling system for cooling an internal combustion engine 1 in a vehicle. The coolantis circulated in the cooling system by means of a coolant pump 2 which is arranged in ainlet line 3 to the internal combustion engine 1. E fi er that the coolant has passed throughthe internal combustion engine 1 is led to an oil cooler 4 for a hydraulic retarder.101520253035The coolant is then passed through a line 5 which branches into a main line Sa anda parallel wire Sb. The main line 5a leads to a main part of the coolanta main tin switch 6. The main thermostat 6 has a control temperature T1 which,for example, may be 80 ° C. Then the coolant has a lower temperature thancontrol temperature T; the main thermostat 6 is in a closed position.
    The main thermostat 6 thus leads the coolant to a return line 7 which is connectedwith the inlet line 3 to the internal combustion engine 1. When the coolant has a highertemperature than the control temperature T1, the main thermostat 6 is in an open position.
    In this case, the main thermostat 6 leads the coolant to a line 8 and a cooler 9 thereit cools. The radiator 9 can be mounted at a front part of the vehicle. A cooler fl genuine10 sucks a cooling lye stream through the cooler 9 so that the coolant provides oneefficient cooling in the cooler 9. After the coolant has cooled in the cooler 9, it is led, via areturn line 11, back to the inlet line 3 and the internal combustion engine 1.
    A small part of the coolant flow in the line 5 is led into the parallel line 5b.
    The parallel line 5b leads the coolant to an extra thermostat 12. The extrathe thermostat 12 has a control temperature TO which is lower than that of the main thermostatcontrol temperature T1. The control thermostat temperature control TO can,for example, be 5 ° C lower than the control temperature T1 of the main thermostat. Thenthe coolant has a lower temperature than the control temperature TÛ sets it extrathe thermostat in a closed position. The extra thermostat 12 thus dissipates the coolantthe parallel line 5b, via a line 5b1, to the return line 7. When the coolant hasa higher temperature than the control temperature TO sets the auxiliary thermostat 12 inan open position. The additional thermostat 12 in this case conducts the coolant, via the line 5b2,to the line 8 and the radiator 9. If the coolant is cooled in the radiator 9, it is led, via areturn line 11, back to the inlet line 3.
    During three downhills when the internal combustion engine 1 has just been started, the coolant usually has onelower temperature than both the control thermostat temperature control TO andthe main temperature of the main thermostat Tl. In this case, the two thermostats lead 6,12 all coolant to the inlet line 7 and thus to the internal combustion engine 1 withoutcooling. When the coolant has such a temperature, the two thermostats 6, 12 operate onthe same way as a conventional thermostat. After a period of operation of the internal combustion engine 1the coolant in the cooling system is usually heated to a temperature higher than the extra onethermostat control temperature TO but lower than main thermostat 6control temperature Tl. Then the coolant has a temperature within this101520253035temperature range, the extra thermostat 12 coolant leads to line 8 andthe cooler 9 at the same time as the main thermostat 6 conducts coolant to the inlet line 7.
    Thus, a smaller part of the coolant is led to the cooler 9 for cooling while itthe main part of the coolant is led to the internal combustion engine 1 without being cooled. Thethe smaller part of the coolant which is led to the line 8 and the cooler 9 provides oneheating the material in these units in a first step;During continued operation of the internal combustion engine 1 and any activation of the retarderthe temperature of the coolant in the line 5 can rise to a higher temperature thanthe control temperature T1 of the main thermostat 6. When it happens, both standthe main thermostat 6 and the auxiliary thermostat 12 in an open position at which allcoolant is led to the radiator 9 for cooling. Then the coolant has such a temperaturethe two thermostats 6, 12 thus function in the same way as a conventional onethermostat. The hot coolant, which is now circulating through line 8 and the radiator 9,heats the material in these units in a second step. By arranging an extrathermostat 12 with a lower control temperature TU than the main thermostat 6control temperature T1 in a parallel line 5b can thus a smaller amountcoolant with a temperature not exceeding that of the main thermostatcontrol temperature T; used to provide an initial heating ofthe line 8 and the cooler 9 in a first step. Then the main thermostat 6 is opened in a laterstage, the material in the line 8 and the cooler 9 provide a heating in a secondstep. In this case, a slower heating of the material in the pipe is provided8 and the cooler 9. Thus, the material in the line 8 and in the cooler 9 will notexposed to the same rapid heating and the same high thermal load as thena conventional thermostat suddenly opens and conducts the entire hot coolant fatethrough the line 8 and the radiator 9. By means of the additional thermostat 12 is providedalso some cooling of the coolant in the cooling system before the main thermostat opens.
    The coolant temperature thus does not rise as fast in connection withmain temperature control temperature Tl. The main thermostat 6 thus has timeto open before the coolant temperature becomes too high. Thus, even a smoother cancoolant temperature is obtained.
    Fig. 2 shows a thermostat housing 13 which comprises both a main thermostat 6 and an additional onethermostat 12. The thermostat housing 13 consists of an upper part 13a and a lower part 13b which isjoined in an appropriate manner. The upper part 13a of the housing comprises an inlet opening 5cfor receiving coolant from a line corresponding to line 5 in Fig. 1.101520253035The upper part 13a of the housing also comprises an outlet opening 7a which is connected to oneinlet line corresponding to the inlet line 7 in FIG. l. Lower part of the house 13bcomprises an outlet opening Sa which is connected to a line corresponding toline 8 in FIG. A thermostat plate 14 is attached between the two parts 13a, 13b of the housing.
    The thermostat plate 14 is provided with a through opening. The main tennis state 6 isarranged so that it can regulate the coolant flow through the opening of the thermostat plate 14.
    The main thermostat 6 comprises a temperature sensing sensor in the form of a sleeve 15which encloses a wax substance. The sleeve 15 is made of a thin-walled metal materialwith good heat-conducting properties such as aluminum, copper or brass.
    The wax core inside the sleeve 15 has the property of changing the phase from a solid state to afl surface condition at the main thermostat control temperature T1. Then the wax core insidethe sleeve 5 changes to the fl surface state, it increases in volume. The sleeve 15 is firmly connectedwith a poppet valve 16 which closes the opening of the thermostat plate 14. A spring member 17is clamped between the poppet valve 16 and an upper support portion 18 of the main tin state 6.
    The spring member 17 tends to displace the poppet valve 16 downward toward a positionwhich it closes to the opening of the thermostat plate 14. The sleeve 15 is slidablearranged on a rod 19 which at one lower end is fixed in a lower support portion 20.
    The support portions 18, 20 include spaces through which the coolant can pass. The bar19 has a cylindrical portion or the like which is in contact with the wax blank insidesleeve 15. When the wax substance changes phase, the sleeve 15 provides a displacement movement inrelation to the rod 19. The sleeve 15 is connected at an upper portion to avalve body 21.
    The poppet valve 16 is provided with a through hole 22. An additional thermostat 12 isadapted to regulate the coolant flow through said hole 22. The auxiliary thermostat 12is significantly smaller than the main thermostat 6 but it has a substantially equivalentConstruction. The auxiliary thermostat 12 includes a temperature sensing sensor inin the form of a sleeve 23 enclosing a wax blank. The wax iron inside the sleeve 23 hasthe property that it changes phase from a solid state to a liquid state at the extrathe thermostat control temperature TG. The control thermostat control temperature TOis 3 -10 ° C lower than the main valve control temperature T1. Sleeve 23 is fixedconnected to a poppet valve 24. The poppet valve 24 has a shape so that it can coverthrough the opening 22 of the poppet valve 16. A capercaillie member 25 is sandwiched betweenthe poppet valve 24 and an upper support portion 26 of the auxiliary thermostat 12.
    The spring member 25 strives to displace the poppet valve 24 downwards towards a position i101520253035which it closes to the through opening 22 of the poppet valve 16. The I-cylinder 23 isslidably mounted on a rod 27 which at one lower end is fixed in a lower support portion28. The rod 27 is connected to a cylindrical portion or the like which is incontact with the wax substance inside the sleeve 23.
    During operation of the internal combustion engine 1, the coolant pump 2 circulates coolant throughthe cooling system. The coolant is led into the valve body 13 via the inlet opening 5c.
    The coolant in the valve body 13 comes into contact with the sleeve 15 of the main valve 6and the sleeve 23 of the auxiliary valve 12. During operating conditions when the coolant ithe cooling system has a lower temperature than the control temperature TO of the additional thermostat,the wax blanks inside the two sleeves 15, 23 are in a solid state. The waxes occupythus a minimal volume inside the respective sleeves 15, 23. Return spring 17 ofthe main thermostat 6 thus holds the valve plate 16 in a closed position in which itcloses the opening of the thermostat plate 14. Return] eats 17 at the extra thermostat holdsthe valve plate 24 in a closed position where it closes the through hole 22 inthus, the plate valve 16. In this case, no coolant can pass the plate valve16 and is led to the outlet opening Sa and the cooler 9. In this case, providethe coolant thus no cooling in the radiator 9. All coolant is led in this; fall out throughthe outlet opening 7 ~ a after which the coolant is led to the internal combustion engine 1 without cooling.
    During operating cases when the coolant is not cooled in the cooler 9, the coolant usually risestemperature in the cooling system. As soon as the coolant temperature rises above the extrathe control temperature TO of the thermostat 12 begins to melt the wax substance in the sleeve 23. Thenthe wax substance melts it increases in volume. The expansion of the wax substance inside the sleeve 23 results inthat the sleeve 23 is displaced upwards on the rod 27. Thus, the disc valve 24 exposes thethrough the hole 22 in the poppet valve 16. This condition is shown in Fig. 2. A small part ofcoolant fl fate led in this case, via the hole 22 in the poppet valve 16, to the valve bodylower part 13b where it is led out through the outlet opening Sa and to the radiator 9.
    Thus, the material in the radiator 9 provides a heating in a first step. Thehowever, the main coolant flow is discharged through the outlet opening 7a and back tointernal combustion engine 1 without cooling.
    If the coolant temperature continues to rise so that it also becomes higher thanthe control temperature T1 of the main thermostat also begins to grow the wax substance in the sleeve 15melt. As the wax substance melts and expands inside the sleeve 15, it results in the sleeve15 is displaced upwards on the rod 19. Thus, the disc valve 16 exposes10'1520253035the entire opening of the thermostat plate 14. At the same time, the sleeve 15 displaces the valve body 21upwards so that it closes the outlet opening 7a. In this case, the entire coolant l is destined,through the opening of the thermostat plate 14, to the lower part 13b of the valve body where the coolantis discharged through the outlet opening 8a and to the cooler 9. In this case, acooling 'of all coolant in the radiator 9. When the temperature of the coolant drops belowmain temperature control temperature T; solidifies the wax substance again in the sleeve 15 whichresults in the poppet valve 16 closing. Should the coolant temperature also dropbelow the auxiliary thermostat control temperature TO also closes the poppet valve 24.
    Fig. 3 shows a thermostat housing 29 which comprises two main thermostats 6a, 6b.
    The thermostat housing 29 consists of an upper part 29a and a lower part 29b. Thermostat housingupper part 29a comprises an outlet opening 8a which is connected to a conduit 8 whichleads coolant to a cooler 9. The lower part 29b of the thermostat housing comprises ainlet opening 5c for receiving coolant from a corresponding linethe line 5 in Fig. 1 and an outlet opening 7a which is connected to the inlet line7 which leads coolant to the internal combustion engine 1. A thermostat plate 30 is attached betweenthe two parts of the house 29a, 29b. The thermostat plate 30 is provided with a two throughopenings. The main tin states 6a, 6b are adapted to regulate the coolant flow througheach of said openings. The main thermocouples 6a, 6b comprise onetemperature sensing sensor in the form of a respective sleeve 15a, 15b enclosing onewax substance. The first main thermostat 6a has a sleeve 15a which contains a wax corewhich is phase converted at a temperature Th which may, for example, be 85 ° and the otherthe main thermostat 6b has a sleeve 15b which contains a wax core which is phase convertedat a temperature Tu, which may be, for example, 92 ° C. The sleeves of the main thermostatsl5a, l5b are fixedly connected to a respective poppet valve l6a, l6b. The disc valves16a, 16b have a shape so as to cover the respective openings of the thermostat plate 30. Onespring means 17a, 17b are clamped between the disc valves 16a, 16b and an upper support portion18a, 18b of the respective main thermostats 6a, 6b. The spring means 17a, 17b striveafter displacing the poppet valves 16a, 16b downwards towards a closing position ofthe openings of the thermostat plate 30. The sleeves l5a, l5b are slidably arranged on onerespective rods 19a, 19b which are attached at a lower end to a lower support portion 20a, 20b.
    An additional thermostat housing 31 contains an additional thermostat 12a. The Extra Ternostat House 31consists of an upper part 3la and a lower part 31b. The upper part 3a of the thermostat housing includesan outlet opening Sb which is connected to the line 8 to which coolant leadsthe radiator 9. The lower part 3 lb of the thermostat housing comprises an inlet opening Sd for10152025303510receiving coolant from the line 5 and an outlet opening 7b which is connectedwith the inlet line 7. A thermostat plate 24a is attached between the two parts 3a of the housing 3a,3 lbs. The thermostat plate 24a is provided with a through opening. The extrathe thermostat 12a is adapted to regulate the coolant flow through the thermostat plate 24aopening The extra tin state l2a comprises a temperature sensing sensor in shapeof a sleeve 23a enclosing a wax blank which is phase converted at a temperature TOwhich may, for example, be 80 °. The cylinders 23a are fixedly connected to a poppet valve 24awhich has a design so as to cover the opening of the thermostat plate 24a. A vascular organ25a is clamped between the poppet valve 24a and an upper support portion 26a of the auxiliarythermostats I2a. The spring member 25a strives to displace the poppet valve 24a downwardagainst a position in which it closes to the opening of the thermostat plate 32. Sleeve 23a isslidably mounted on a respective rod 27a which at one lower end is attached to onelower support paita 28a. The auxiliary thermostat 12a has a smaller plate valve 24athan the disc valves 16a, 16b of the two main thermostats 6a, 6b.
    During operation of the internal combustion engine 1, coolant is circulated parallel to the valve bodiesa 29, 3 l. The coolant is led into the valve body 29, via the inlet opening 5c, where itcomes into contact with the sleeves 15a, 15b of the main terminostats 6a, 6b. The coolantis led parallel into the valve body 31, via the inlet opening Sd, where it enterscontact with the sleeve 23a of the auxiliary thermostat 6a, 6b. Under dri fi stiílfallen thenthe coolant in the cooling system has a lower temperature than that of the extra thermostatcontrol temperature TO, the wax cores are inside the sleeves 15a, 15b, 23a in a fixedstate. The main thermostats 6a, 6b and the auxiliary thermostat 23a are thus in oneclosed mode. Thus, in this case, no coolant can pass past the respective onesthe plate valves 16a, 16b, 24a and are discharged via the outlet openings Sa, 8b tothe line S and the cooler 9. In this case, the coolant thus provides no coolingin the radiator 9. lWhen the coolant temperature rises to a higher temperature than that of the auxiliary thermostat 12acontrol temperature TO melts the wax blank in the sleeve 23a and the poppet valve 24afi inserts the opening of the thermostat plate 32. This condition is shown in Fig. 3. Coolant fatewhich reaches the valve body 31 is in this case led through the opening of the thermostat plate 24a tothe upper part 31a of the valve body, after which it is led out through the outlet opening 8b tothe line 8 and the cooler 9. Since the main thermostats 6a., 6b in a closed position are ledcoolant fl the fate reaching the valve body 29 out through the outlet openings 7a, 7b andback to the combustion engine 1 via line 7 without cooling.10152025303511If the coolant temperature continues to rise so that the coolant temperature becomes higherthan the control temperature of the first main thermostat Tm begins the wax substance in the sleeve 15 ato melt. As the wax substance melts and expands inside the sleeve 15a, it results in thatthe sleeve 15a is displaced upwards on the rod 19a. Thus, the disc valve 16a insertsone opening of the thermostat plate 14. In this case, the first main thermostat 6a leads apart of the coolant fl which reaches the thermostat body 29 to the outlet opening 8a,the line 8 and the radiator 9. The second main thermostat 6b, which is in a closed position,leads a remaining part of the coolant flow which reaches the thermostat body 29 out throughthe outlet openings 7a, 7b and back to the internal combustion engine 1 via the line 7 withoutto cool. The main valves 6a, 6b in this example are the same size. Coolant flow asis led out through the outlet openings 7a of the thermostat body 29, Sa is in this case equal in size.
    If the coolant temperature continues to rise so that the coolant temperature also becomeshigher than the control temperature Tu of the other main thermostat, the wax substance begins insleeve l5b also to melt. Then the wax substance melts and expands inside the sleeve l5bthis results in the sleeve l5b being displaced upwards on the rod l9b. Thus fi addsthe second opening of the poppet valve I6b of the thermostat plate 14. In this case, the first leadsthe main thermostat 6a and the second main thermostat 6b the entire coolant flow which reachesthe thermostat body 29, to the outlet opening 8a, the line 8 and the radiator 9. Thenthe coolant has this temperature, thus the entire coolant flow is led to the cooler 9 tokylas. At operating times when the coolant temperature drops, the main thermostats 6a,6b and the auxiliary thermostat is closed in turn, resulting in a gradualreduction of coolant cooling.
    In this case, three parallel-connected thermostats 6a, 6b, 12a with different ones are thus usedcontrol temperatures TO, Th, Tlb. The extra thermostat 12a enables a relativesmall flow of coolant having a temperature just below the first inmain temperature control temperature Tla. Thus, a suitable heating ofthe line 8 and the cooler 9 are obtained in a first step. With that comes the lead 8and the radiator 9 not to be subjected to the same high thermal stress thenthe main thermostats 6a, 6b open and conduct hot coolant in a relatively large amount tothe line 8 and the radiator 9. By means of the three thermostats 6a, 6b, connected in parallel,l2a which have different control temperatures TO, Tja, T n, can cause rapid oscillationsthe coolant temperature is also reduced and a more even coolant temperature is obtained below12Operation. This is an advantage both for the internal combustion engine I and other components such ascooled or heated by the coolant in the cooling system.
    The invention is in no way limited to the embodiment described inthe drawing but can be varied freely within the scope of the claims.
    权利要求:
    Claims (10)
    [1]
    Arrangement for controlling the temperature of coolant circulating in a cooling system, the arrangement comprising at least one main thermostat (6, 6a, 6b) adapted to direct coolant to a cooler (9) in the cooling system at three då stills when the coolant has a higher temperature than a control temperature (Tr, TIO, Tlb), for the main thermostat (6, 6a, 6b), characterized in that the arrangement comprises an additional thermostat (12, 12a) having a control temperature (f 0), which is lower than that of the main thermostat (6 , 6a, 6b) control temperature (Ti, Tla, Tlb), the auxiliary thermostat (12, 12a) being adapted to conduct a part of the coolant flow circulating in the cooling system to the cooler (9) in the operating cases when the coolant has a higher temperature than extra thermostat control temperature (TO).
    [2]
    Arrangement according to claim 1, characterized in that the auxiliary thermostat (12, 12a) is adapted to conduct a smaller part than 50% of the coolant fl fate circulating in the cooling system, with: Advantage 5 - 20% of the coolant fl fate, to the radiator (9) at three då stills when the coolant has a higher temperature than the control thermostat's control temperature (TO).
    [3]
    Arrangement according to Claim 1 or 2, characterized in that the control temperature (TO) of the auxiliary thermostat is 3 ° C ~ 10 ° C lower than the control temperature of the main thermostat (6, 6a, 6b) (T1, TM, Tlb).
    [4]
    Arrangement according to one of the preceding claims, characterized in that the arrangement comprises lines arranged in parallel which lead the coolant to the auxiliary thermostat (12, 12a) and the main thermostat (6, 6a, 6b).
    [5]
    Arrangement according to one of the preceding claims 1 to 3, characterized in that the main thermostat (6) and the auxiliary thermostat (12) are arranged in a common terrno state house (13).
    [6]
    Arrangement according to claim 5, characterized in that the main thermostat (6) comprises a poppet valve (16) provided with a through hole (22) and that the additional thermostat (12) is mounted on the poppet valve (16) in connection with said through hole. hole (22) where it is adapted to be placed in an open position and lead coolant, via said hole (22), to the cooler (9) during operating cases when the coolant has a higher temperature than the control temperature (TO) of the auxiliary thermostat. 10 15 20 14
    [7]
    Arrangement according to one of the preceding claims, characterized in that the arrangement comprises two main thermostats (6a, 6b) arranged in parallel which have different control temperatures (Th, Tlb).
    [8]
    Arrangement according to Claim 7, characterized in that the two main thermostats (6a, 6b) arranged in parallel are arranged in a common thermostat housing (29).
    [9]
    Arrangement according to claim 7 or 8, characterized in that one of the two main thermostats (6b) arranged in parallel has a control temperature (Tlb) which is 3 ~ ° C - 10 ° C higher than the control temperature (Ta) of the other main thermostat (6a). hrs).
    [10]
    Arrangement according to one of the preceding claims, characterized in that at least one of the thermostats (6, 6a, 6b, 12, 12a) comprises a temperature sensing means in the form of a casing which encloses a wax substance which is adapted to change phase at the thermostat's control temperature ( Ib, TI, Th, Tlb).
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    同族专利:
    公开号 | 公开日
    SE536527C2|2014-02-04|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    2021-06-01| NUG| Patent has lapsed|
    优先权:
    申请号 | 申请日 | 专利标题
    SE1051083A|SE536527C2|2010-10-18|2010-10-18|Arrangements for controlling the temperature of coolant circulating in a cooling system|SE1051083A| SE536527C2|2010-10-18|2010-10-18|Arrangements for controlling the temperature of coolant circulating in a cooling system|
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