US20190041145A1 - Three-way modulating valve for temperature control - Google Patents
Three-way modulating valve for temperature control Download PDFInfo
- Publication number
- US20190041145A1 US20190041145A1 US15/665,654 US201715665654A US2019041145A1 US 20190041145 A1 US20190041145 A1 US 20190041145A1 US 201715665654 A US201715665654 A US 201715665654A US 2019041145 A1 US2019041145 A1 US 2019041145A1
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- Prior art keywords
- fluid
- valve
- heat exchanger
- set forth
- supply
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Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
- F28F27/02—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus for controlling the distribution of heat-exchange media between different channels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENTS OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D13/00—Arrangements or adaptations of air-treatment apparatus for aircraft crew or passengers, or freight space, or structural parts of the aircraft
- B64D13/006—Arrangements or adaptations of air-treatment apparatus for aircraft crew or passengers, or freight space, or structural parts of the aircraft the air being used to cool structural parts of the aircraft
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENTS OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D13/00—Arrangements or adaptations of air-treatment apparatus for aircraft crew or passengers, or freight space, or structural parts of the aircraft
- B64D13/06—Arrangements or adaptations of air-treatment apparatus for aircraft crew or passengers, or freight space, or structural parts of the aircraft the air being conditioned
- B64D13/08—Arrangements or adaptations of air-treatment apparatus for aircraft crew or passengers, or freight space, or structural parts of the aircraft the air being conditioned the air being heated or cooled
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P7/00—Controlling of coolant flow
- F01P7/14—Controlling of coolant flow the coolant being liquid
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/54—Arrangements for modifying the way in which the rate of flow varies during the actuation of the valve
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
- F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
- F16K11/04—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only lift valves
- F16K11/044—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only lift valves with movable valve members positioned between valve seats
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
- F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
- F16K11/08—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only taps or cocks
- F16K11/085—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only taps or cocks with cylindrical plug
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/08—Details
- F16K5/12—Arrangements for modifying the way in which the rate of flow varies during the actuation of the valve
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
- F28D15/06—Control arrangements therefor
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/01—Control of temperature without auxiliary power
- G05D23/13—Control of temperature without auxiliary power by varying the mixing ratio of two fluids having different temperatures
- G05D23/1306—Control of temperature without auxiliary power by varying the mixing ratio of two fluids having different temperatures for liquids
- G05D23/132—Control of temperature without auxiliary power by varying the mixing ratio of two fluids having different temperatures for liquids with temperature sensing element
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P7/00—Controlling of coolant flow
- F01P7/14—Controlling of coolant flow the coolant being liquid
- F01P2007/146—Controlling of coolant flow the coolant being liquid using valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P2025/00—Measuring
- F01P2025/08—Temperature
- F01P2025/52—Heat exchanger temperature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F2250/00—Arrangements for modifying the flow of the heat exchange media, e.g. flow guiding means; Particular flow patterns
- F28F2250/06—Derivation channels, e.g. bypass
Definitions
- This application relates to a three-way modulating valve placed to modulate the flow of a cooling fluid through a heat exchanger to, in turn, control the temperature of a cooled fluid.
- Temperature control systems are known and widely utilized. In one application, a system controls the temperature of the air being delivered into a spacecraft environment.
- a system for changing the temperature of a first fluid to meet a desired temperature comprises a fluid supply for the first fluid, the fluid supply for the first fluid passing through a heat exchanger.
- a temperature sensor for the first fluid senses a temperature of the first fluid downstream of the heat exchanger.
- a supply for a second fluid changes a temperature of the first fluid.
- the supply for the second fluid passes through the heat exchanger.
- a valve is positioned upstream of the said heat exchanger on the supply for the second fluid, and controls a flow rate of the second fluid diverted into a bypass line compared to a flow rate of the second fluid directed through the heat exchanger, with the three-way valve controlled by a control in response to feedback from said temperature sensor.
- the valve changes the respective flow rates delivered into the bypass line and through the heat exchanger in a non-linear manner with a change in valve position
- a manned spaceship is also disclosed.
- FIG. 1 schematically shows a system.
- FIG. 2 shows a valve incorporated into the FIG. 1 system.
- FIG. 3 shows a portion of the valve of FIG. 2 .
- FIG. 4A shows an operational feature
- FIG. 4B shows another feature.
- FIG. 5 is a graph showing a change in temperature achieved by a respective amount of flow bypass around a heat exchanger with and without the non-liner valve.
- FIG. 6 compares the prior art flow split with a non-linear valve as disclosed here.
- FIG. 7 shows another embodiment.
- FIG. 8 shows yet another embodiment.
- FIG. 1 shows an airflow system 20 for delivering air into interior 22 of a manned spacecraft. While this particular application is disclosed, it should be understood that the teachings of this disclosure would extend to other applications.
- a pump 24 moves a cooling fluid through a line 26 to heat exchanger 28 .
- the cooling fluid line includes a three-way modulating valve 30 which may selectively divert a portion of the cooling fluid into a bypass line 32 , which bypasses the heat exchanger 28 .
- the lines 26 and 32 may reconnect at a downstream point 33 .
- the modulating valve 30 is able to control the respective flow rate going to the bypass line 32 compared to the flow rate to line 26 , and heat exchanger 28 .
- the modulating valve 30 is capable of infinitely varying the respective flow rates between 0 and 100%.
- a control 40 is shown schematically controlling the valve 30 and taking in feedback from a temperature sensor 36 .
- Temperature sensor 36 senses the temperature of air in a line 31 downstream of the heat exchanger 28 .
- a fan 34 drives air through the heat exchanger 28 to be cooled to a temperature desired and achieved by control 40 .
- the size of the valve may be dramatically reduced compared to the prior art mentioned above.
- the valve 30 has unique characteristics.
- the valve 30 achieves non-linear flow bypass as a function of valve position.
- the non-linear flow bypass ratio profile is tailored to compensate for a non-linear response of the heat exchanger. That is, the heat exchanger 28 does not behave in a linear fashion dependent on the flow rate of cooling fluid delivered through the heat exchanger 28 .
- Applicant has recognized that a linear change in flow rate would result in a non-linear change in temperature.
- valve 30 has a pressure drop profile tailored to balance a pressure drop across the heat exchanger. That is, as the flow rate of cooling fluid passing through the heat exchanger changes, the pressure drop across the heat exchanger would also change. Due to the valve's unique pressure drop profile, an overall system hydraulic resistance remains relatively constant regardless of the valve position. This simplifies the design of the centrifugal pump 24 and allows the use of a relatively less expensive fixed speed pump 24 . This characteristic reduces the induction of variation in system flow rate across the whole system 20 .
- the non-linear flow bypass ratio and the pressure drop profile are achieved by a shape of valve windows in the valve 30 .
- the valve 30 generally includes a rotating spool 41 receiving the cooling fluid into a central chamber 42 . The fluid then flows outwardly through windows 50 and 52 .
- Outlets 44 and 46 are formed in a valve housing. Outlet 44 delivers fluid to line 26 and hence to the heat exchanger. Outlet 46 delivers the fluid to the bypass line 32 .
- FIG. 3 shows the spool 41 .
- the fluid is delivered into the interior as shown by arrow F. It then flows outwardly through a window profile defined by window portions 50 and 52 .
- the profiles 50 and 52 may be generally symmetrical and have a very large, non-linear change in area across a circumferential extent. At one circumferential end 70 , flow area is small.
- FIG. 4A this is shown aligned with the opening 44 .
- control 40 changes the circumferential location of the spool 41 , the amount of fluid delivered into lines 26 and 32 varies in a non-linear fashion.
- specific shape of the windows 50 and 52 is selected to achieve the pressure drop control.
- an end 71 opposite to end 70 is the relatively large volume portion and includes the central portion 62 and the wings 60 .
- angled ends 64 extend from a central portion 62 into a smaller central portion 66 and then into a tapering portion 68 that eventually leads to the end 70 .
- each of the first and second windows 50 , 52 have an enlarged area portion and change to smaller areas in a non-linear manner when moving in a circumferential direction.
- the first and second valve windows 50 , 52 have enlarged area portions 62 which are circumferentially adjacent to each other and smaller area portions 68 which are circumferentially spaced from each other.
- the enlarged area portion 62 extends between enlarged ends and wings 60 in a direction generally perpendicular to the circumferential direction.
- FIG. 4B shows one position, wherein the outlet 46 is aligned with a greater volume of the window 52 than is the outlet 44 aligned with the window 50 .
- valve While a rotary valve is shown, a similar non-linear bypass effect can be achieved in other ways.
- the valve may move along an axial direction to achieve non-linear flow.
- the temperature response seen in the air being cooled is relatively linear with a change in bypass ratio.
- FIG. 6 compares a flow split for a linear flow profile with that for a non-linear flow. As can be appreciated in the left-hand graph, a change in the primary flow X moves in a linear manner compared to a change in the secondary or bypass flow Y.
- FIG. 7 Another embodiment 100 is shown in FIG. 7 .
- a fluid supply 102 is split between supplies 104 and 106 , leading to a heat exchanger 28 , and a bypass line, as shown in FIG. 1 .
- An actuator 108 moves a shaft 110 in a linear direction to move two valve pistons 112 and 116 relative to valve seats 114 and 118 .
- the change in flow rates would not be non-linear in this embodiment, for reasons mentioned above.
- the change in pressure drop feature mentioned above will preferably also be achieved by this embodiment.
- FIG. 8 shows an embodiment 150 wherein a window 154 supplies fluid to the heat exchanger and another window 152 , supplies fluid to the bypass.
- Windows 152 and 154 have different shapes, or profiles. That is, they are non-symmetric.
- the window 154 begins to be closed, it gains 80% of flow within a first 18% of rotation, in one example.
- the window 152 moves to close, it gains only 20% of flow over 82% of rotation.
- the windows 154 and 152 provide equal flow at approximately 8% of the rotary valve position, as opposed to 50%.
- valve pistons 112 and 116 in the FIG. 7 embodiment can also be modified in view of this concept such that they are not symmetric.
- a unique system is disclosed for providing a controlled supply of a cooled fluid. It should be understood that a system would have benefits in many other applications. As only one example, the fluid with the controlled temperature and without the bypass valve might be heated rather than cooled.
- This disclosure provides a temperature response in a first fluid that approaches a linear change, with respect to a modulating valve position for a second fluid.
- the valve modulates the second fluid saves weight and volume.
- the valve design has a nonlinear flow split to achieve this feature.
Abstract
Description
- This application relates to a three-way modulating valve placed to modulate the flow of a cooling fluid through a heat exchanger to, in turn, control the temperature of a cooled fluid.
- Temperature control systems are known and widely utilized. In one application, a system controls the temperature of the air being delivered into a spacecraft environment.
- It is known to pass the air through a heat exchanger to cool the air with a cooling fluid. It is also known to have a three-way modulating valve that modulates the amount of air passing through the heat exchanger such that a percentage of the air may bypass the heat exchanger. In this way, a desired temperature is achieved downstream.
- Since the volume of air passing through such a system is large, the size of the modulating valve is also large.
- In addition, known modulating valves have generally changed flow rates in a linear manner.
- A system for changing the temperature of a first fluid to meet a desired temperature comprises a fluid supply for the first fluid, the fluid supply for the first fluid passing through a heat exchanger. A temperature sensor for the first fluid senses a temperature of the first fluid downstream of the heat exchanger. A supply for a second fluid changes a temperature of the first fluid. The supply for the second fluid passes through the heat exchanger. A valve is positioned upstream of the said heat exchanger on the supply for the second fluid, and controls a flow rate of the second fluid diverted into a bypass line compared to a flow rate of the second fluid directed through the heat exchanger, with the three-way valve controlled by a control in response to feedback from said temperature sensor. The valve changes the respective flow rates delivered into the bypass line and through the heat exchanger in a non-linear manner with a change in valve position
- A manned spaceship is also disclosed.
- These and other features may be best understood from the following drawings and specification.
-
FIG. 1 schematically shows a system. -
FIG. 2 shows a valve incorporated into theFIG. 1 system. -
FIG. 3 shows a portion of the valve ofFIG. 2 . -
FIG. 4A shows an operational feature. -
FIG. 4B shows another feature. -
FIG. 5 is a graph showing a change in temperature achieved by a respective amount of flow bypass around a heat exchanger with and without the non-liner valve. -
FIG. 6 compares the prior art flow split with a non-linear valve as disclosed here. -
FIG. 7 shows another embodiment. -
FIG. 8 shows yet another embodiment. - These and other features may be best understood from the following drawings and specification.
-
FIG. 1 shows anairflow system 20 for delivering air intointerior 22 of a manned spacecraft. While this particular application is disclosed, it should be understood that the teachings of this disclosure would extend to other applications. - A
pump 24 moves a cooling fluid through aline 26 toheat exchanger 28. The cooling fluid line includes a three-way modulating valve 30 which may selectively divert a portion of the cooling fluid into abypass line 32, which bypasses theheat exchanger 28. Thelines downstream point 33. - The modulating
valve 30 is able to control the respective flow rate going to thebypass line 32 compared to the flow rate toline 26, andheat exchanger 28. The modulatingvalve 30 is capable of infinitely varying the respective flow rates between 0 and 100%. - A
control 40 is shown schematically controlling thevalve 30 and taking in feedback from atemperature sensor 36.Temperature sensor 36 senses the temperature of air in aline 31 downstream of theheat exchanger 28. Afan 34 drives air through theheat exchanger 28 to be cooled to a temperature desired and achieved bycontrol 40. - By placing the modulating
valve 30 on the cooling fluid line, rather than the airflow line, the size of the valve may be dramatically reduced compared to the prior art mentioned above. - The
valve 30 has unique characteristics. In particular, thevalve 30 achieves non-linear flow bypass as a function of valve position. The non-linear flow bypass ratio profile is tailored to compensate for a non-linear response of the heat exchanger. That is, theheat exchanger 28 does not behave in a linear fashion dependent on the flow rate of cooling fluid delivered through theheat exchanger 28. As should be understand, Applicant has recognized that a linear change in flow rate would result in a non-linear change in temperature. - In addition, the
valve 30 has a pressure drop profile tailored to balance a pressure drop across the heat exchanger. That is, as the flow rate of cooling fluid passing through the heat exchanger changes, the pressure drop across the heat exchanger would also change. Due to the valve's unique pressure drop profile, an overall system hydraulic resistance remains relatively constant regardless of the valve position. This simplifies the design of thecentrifugal pump 24 and allows the use of a relatively less expensivefixed speed pump 24. This characteristic reduces the induction of variation in system flow rate across thewhole system 20. - In one embodiment, the non-linear flow bypass ratio and the pressure drop profile are achieved by a shape of valve windows in the
valve 30. As shown inFIG. 2 , thevalve 30 generally includes a rotatingspool 41 receiving the cooling fluid into acentral chamber 42. The fluid then flows outwardly throughwindows -
Outlets Outlet 44 delivers fluid toline 26 and hence to the heat exchanger.Outlet 46 delivers the fluid to thebypass line 32. -
FIG. 3 shows thespool 41. The fluid is delivered into the interior as shown by arrow F. It then flows outwardly through a window profile defined bywindow portions - As shown in
FIG. 4A , theprofiles circumferential end 70, flow area is small. - In
FIG. 4A , this is shown aligned with theopening 44. In the positions shown inFIG. 4A , there would be a relatively small amount of fluid being delivered to theheat exchanger 28 compared to the amount delivered from the relatively large portions defined bywings 60 andcentral portion 62, which are communicating with theoutlet 46. - However, as the
spool 41 moves circumferentially, one can appreciate that the size of thewindow 52 aligned with thepassage 46 will move into smaller portions such that it approaches the end 70 (not shown forprofile 52, but it is the same as profile 50). - Thus, as the
control 40 changes the circumferential location of thespool 41, the amount of fluid delivered intolines windows - In the illustrated embodiment, an
end 71 opposite to end 70 is the relatively large volume portion and includes thecentral portion 62 and thewings 60. As shown, angled ends 64 extend from acentral portion 62 into a smallercentral portion 66 and then into a taperingportion 68 that eventually leads to theend 70. - It could be said each of the first and
second windows second valve windows area portions 62 which are circumferentially adjacent to each other andsmaller area portions 68 which are circumferentially spaced from each other. Theenlarged area portion 62 extends between enlarged ends andwings 60 in a direction generally perpendicular to the circumferential direction. -
FIG. 4B shows one position, wherein theoutlet 46 is aligned with a greater volume of thewindow 52 than is theoutlet 44 aligned with thewindow 50. As also shown inFIG. 4B , there are gaskets or seals 61 sealing off the rest of the window from the flow path into therespective outlets - While a rotary valve is shown, a similar non-linear bypass effect can be achieved in other ways. In one embodiment, the valve may move along an axial direction to achieve non-linear flow.
- As shown in
FIG. 5 , due to the non-linear valve, the temperature response seen in the air being cooled is relatively linear with a change in bypass ratio. - This can be explained by reference to
FIGS. 5 . -
FIG. 6 compares a flow split for a linear flow profile with that for a non-linear flow. As can be appreciated in the left-hand graph, a change in the primary flow X moves in a linear manner compared to a change in the secondary or bypass flow Y. - However, as shown on the graph to the right, with a non-linear flow split, the primary flow X and the secondary flow Y change in a non-linear manner.
- As mentioned above, Applicant has recognized that such a change will result in a linear temperature change for the fluid to be cooled.
- Another
embodiment 100 is shown inFIG. 7 . Here, afluid supply 102 is split betweensupplies 104 and 106, leading to aheat exchanger 28, and a bypass line, as shown inFIG. 1 . - An
actuator 108 moves ashaft 110 in a linear direction to move twovalve pistons valve seats 114 and 118. The change in flow rates would not be non-linear in this embodiment, for reasons mentioned above. The change in pressure drop feature mentioned above will preferably also be achieved by this embodiment. - Applicant has also recognized that symmetric windows such as shown in
FIGS. 3 and 4A may not be the most preferred embodiment. - Rather, Applicant has recognized that a linear temperature profile may be best achieved by having different changes in the respective flow rate. As an example,
FIG. 8 shows anembodiment 150 wherein awindow 154 supplies fluid to the heat exchanger and anotherwindow 152, supplies fluid to the bypass.Windows - In one example, as the
window 154 begins to be closed, it gains 80% of flow within a first 18% of rotation, in one example. On the other hand, as thewindow 152 moves to close, it gains only 20% of flow over 82% of rotation. Thus, in this example, thewindows - Of course, these numbers are simply examples, The specifics of a particular system will dictate the respect flow rates. Armed with this disclosure, a worker of ordinary skill in this art will be able to recognize how to design the windows to achieve this flow. The profiles of the
valve pistons FIG. 7 embodiment can also be modified in view of this concept such that they are not symmetric. - A unique system is disclosed for providing a controlled supply of a cooled fluid. It should be understood that a system would have benefits in many other applications. As only one example, the fluid with the controlled temperature and without the bypass valve might be heated rather than cooled.
- This disclosure provides a temperature response in a first fluid that approaches a linear change, with respect to a modulating valve position for a second fluid. The valve modulates the second fluid saves weight and volume. The valve design has a nonlinear flow split to achieve this feature.
- Although an embodiment of this invention has been disclosed, a worker of ordinary skill in this art would recognize that certain modifications would come within the scope of this invention. For that reason, the following claims should be studied to determine the true scope and content of this invention.
Claims (20)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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US15/665,654 US20190041145A1 (en) | 2017-08-01 | 2017-08-01 | Three-way modulating valve for temperature control |
EP18186848.0A EP3438780B1 (en) | 2017-08-01 | 2018-08-01 | Three-way modulating valve for temperature control |
US16/934,437 US11519680B2 (en) | 2017-08-01 | 2020-07-21 | Three-way modulating valve for temperature control |
Applications Claiming Priority (1)
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US15/665,654 US20190041145A1 (en) | 2017-08-01 | 2017-08-01 | Three-way modulating valve for temperature control |
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US16/934,437 Continuation US11519680B2 (en) | 2017-08-01 | 2020-07-21 | Three-way modulating valve for temperature control |
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US20190041145A1 true US20190041145A1 (en) | 2019-02-07 |
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US15/665,654 Abandoned US20190041145A1 (en) | 2017-08-01 | 2017-08-01 | Three-way modulating valve for temperature control |
US16/934,437 Active 2037-09-09 US11519680B2 (en) | 2017-08-01 | 2020-07-21 | Three-way modulating valve for temperature control |
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US16/934,437 Active 2037-09-09 US11519680B2 (en) | 2017-08-01 | 2020-07-21 | Three-way modulating valve for temperature control |
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US9472819B2 (en) * | 2012-04-27 | 2016-10-18 | Hamilton Sundstrand Corporation | Warming feature for aircraft fuel cells |
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Also Published As
Publication number | Publication date |
---|---|
US11519680B2 (en) | 2022-12-06 |
US20200348092A1 (en) | 2020-11-05 |
EP3438780B1 (en) | 2021-01-06 |
EP3438780A2 (en) | 2019-02-06 |
EP3438780A3 (en) | 2019-06-26 |
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