WO2022194902A1 - Système de conditionnement thermique - Google Patents
Système de conditionnement thermique Download PDFInfo
- Publication number
- WO2022194902A1 WO2022194902A1 PCT/EP2022/056765 EP2022056765W WO2022194902A1 WO 2022194902 A1 WO2022194902 A1 WO 2022194902A1 EP 2022056765 W EP2022056765 W EP 2022056765W WO 2022194902 A1 WO2022194902 A1 WO 2022194902A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- conditioning system
- thermal conditioning
- expansion device
- passage
- evaporator
- Prior art date
Links
- 230000003750 conditioning effect Effects 0.000 title claims abstract description 54
- 239000012530 fluid Substances 0.000 claims abstract description 93
- 239000003507 refrigerant Substances 0.000 claims abstract description 93
- 230000006835 compression Effects 0.000 claims abstract description 18
- 238000007906 compression Methods 0.000 claims abstract description 18
- 239000013529 heat transfer fluid Substances 0.000 claims abstract description 14
- 238000011144 upstream manufacturing Methods 0.000 claims description 18
- 238000001816 cooling Methods 0.000 description 14
- 230000033228 biological regulation Effects 0.000 description 12
- 239000002826 coolant Substances 0.000 description 12
- 238000004146 energy storage Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000004378 air conditioning Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
- B60H1/00814—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation
- B60H1/00878—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation the components being temperature regulating devices
- B60H1/00899—Controlling the flow of liquid in a heat pump system
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
- F25B5/02—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
- F25B41/32—Expansion valves having flow rate limiting means other than the valve member, e.g. having bypass orifices in the valve body
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
- F25B41/325—Expansion valves having two or more valve members
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
- F25B41/33—Expansion valves with the valve member being actuated by the fluid pressure, e.g. by the pressure of the refrigerant
- F25B41/335—Expansion valves with the valve member being actuated by the fluid pressure, e.g. by the pressure of the refrigerant via diaphragms
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
- F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
- F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
- F25B41/35—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators by rotary motors, e.g. by stepping motors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
- B60H1/00814—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation
- B60H1/00878—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation the components being temperature regulating devices
- B60H2001/00928—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation the components being temperature regulating devices comprising a secondary circuit
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
- B60H1/00814—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation
- B60H1/00878—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation the components being temperature regulating devices
- B60H2001/00949—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation the components being temperature regulating devices comprising additional heating/cooling sources, e.g. second evaporator
Definitions
- the present invention relates to the field of thermal conditioning systems. These thermal conditioning systems can in particular be fitted to motor vehicles. In this type of application, these systems make it possible to ensure thermal regulation of various components or modules of the vehicle. Heat exchanges are mainly managed by the compression and expansion of a refrigerant fluid circulating in a circuit in which several heat exchangers are arranged.
- the refrigerant circulates in two branches of the refrigerant circuit arranged in parallel, and each comprising an evaporator.
- the refrigerant can undergo expansion in each of the evaporators, which makes it possible to absorb heat and ensure thermal regulation of the component or module associated with this evaporator.
- thermostatic expansion valve It is also known to control the expansion of the refrigerant fluid in an evaporator by means of a thermostatic expansion valve. Such an expansion valve regulates the superheat of the refrigerant fluid leaving the evaporator without requiring an electrical control or an electrical signal.
- a thermostatic expansion valve is both inexpensive to manufacture and simple to integrate into a thermal conditioning system.
- An object of the present invention is thus to provide a thermal conditioning system that can operate in a stable manner, even when an evaporator controlled by a thermostatic expansion valve must operate by providing a low thermal power, well below the nominal power.
- the present invention proposes a thermal conditioning system comprising a refrigerant circuit configured to circulate a refrigerant fluid, the refrigerant circuit comprising:
- bypass branch connecting a first connection point arranged on the main loop downstream of the condenser and upstream of the first expansion device to a second connection point arranged on the main loop downstream of the first evaporator and upstream of the compression
- the bypass branch comprising a second expansion device and a second evaporator
- the second expansion device is a thermostatic-type expansion valve configured to vary a flow section of the refrigerant fluid between a minimum flow section and a maximum flow section
- the bypass branch comprises a flow restriction device passage configured to limit a passage section of the refrigerant fluid to a value less than the maximum passage section of the second expansion device.
- the passage restriction device makes it possible to limit the flow rate of refrigerant fluid sent to the second evaporator, without modifying the elements of the second expansion device which participate in the regulation of the passage section of the refrigerant fluid.
- the passage restriction makes it possible to obtain operation with a regular fluid flow refrigerant in the second evaporator.
- the temperature within the second evaporator undergoes fewer variations over time and can be controlled more precisely.
- the thermal conditioning system may be an automotive thermal conditioning system.
- the second expansion device is arranged upstream of the second evaporator.
- the first heat transfer fluid is a flow of air outside the passenger compartment of a motor vehicle.
- the first heat transfer fluid is a heat transfer liquid.
- the first evaporator is configured to exchange heat with a second heat transfer fluid.
- the second heat transfer fluid is a flow of air inside the passenger compartment of the vehicle.
- the second evaporator can be thermally coupled with an element of an electric traction chain of the vehicle.
- the element of the electric traction chain may be an electrical energy storage battery.
- the second evaporator is attached to the electrical energy storage battery.
- the element of the electric traction chain can be an electronic module for controlling an electric traction motor of the vehicle.
- the passage restriction device is configured to limit a refrigerant passage section to a value less than 30% of the maximum passage section of the second expansion device.
- the first expansion device can be an electronic expansion valve, a thermostatic expansion valve, or a calibrated orifice.
- the second expansion device comprises a first refrigerant fluid circulation conduit configured to supply the second evaporator and a second refrigerant fluid circulation conduit configured to receive the refrigerant fluid at the outlet of the second evaporator, and the second expansion device comprises a movable shutter configured to vary a passage section of the first duct under the action of a thermally sensitive element placed in the second duct.
- the passage restriction device is arranged in the second conduit.
- the passage restriction device is arranged upstream of the thermally sensitive element.
- the passage restriction device is arranged downstream of the thermally sensitive element.
- the passage restriction device is a diaphragm comprising a calibrated orifice.
- the diaphragm is cylindrical.
- the calibrated orifice is cylindrical and coaxial with an axis of the diaphragm.
- a passage section of the calibrated orifice is between 0.5% and 10% of the maximum passage section of the second expansion device.
- the second expansion device comprises a housing for receiving the diaphragm, the diaphragm being arranged in the receiving housing.
- the refrigerant circuit comprises a hose connected to the second expansion device, the hose comprising a connecting flange with the second expansion device, and the flange comprises a housing for receiving the diaphragm, the diaphragm being disposed in the receiving housing.
- the passage restriction device is arranged downstream of the second expansion device.
- the passage restriction device is a valve comprising a fluid circulation conduit and a movable shutter disposed in the conduit, the movable shutter being configured to vary a section passage of the valve pipe.
- the passage restriction device comprises an electric motor configured to move the movable shutter.
- the electric motor may be a DC motor.
- the electric motor may be a stepper motor.
- the passage restriction device and the second trigger device are adjacent.
- the passage restriction device and the second trigger device are part of the same body.
- the body can for example be a foundry body.
- the fluid circulation conduit of the passage restriction device is coaxial with the second fluid circulation conduit of the second expansion device.
- the passage restriction device and the second expansion device are connected by a hose.
- the hose connecting the passage restriction device and the second expansion device has a length of less than 10 centimeters.
- the movable shutter of the passage restriction device is a rotating ball comprising a through recess configured to form a portion of fluid circulation conduit.
- an axis of rotation of the rotary ball and an axis of the fluid circulation conduit of the passage restriction device are perpendicular.
- An axis of rotation of the rotary ball and an axis of the through recess are perpendicular.
- the movable shutter of the passage restriction device is a rotary shutter configured to pivot in the fluid circulation conduit.
- the movable shutter of the passage restriction device is a valve movable in translation.
- FIG. 1 is a schematic representation of a thermal conditioning system according to the invention
- FIG. 48 is a partial schematic representation of a thermal conditioning system according to a first embodiment of the invention.
- FIG. 3 is a partial schematic representation of a thermal conditioning system according to a variant of the first embodiment
- Figure 4 is a partial schematic representation of a thermal conditioning system according to another variant of the first embodiment
- FIG. 5 is a partial schematic representation of a thermal conditioning system according to a second embodiment of the invention.
- Figure 6 is a partial schematic representation of a thermal conditioning system according to a variant of the second embodiment
- FIG. 7 is a partial schematic representation of a thermal conditioning system according to another variant of the second embodiment
- Figure 8 is a partial schematic representation of a thermal conditioning system according to yet another variant of the second embodiment
- FIG. 9 shows is a partial schematic representation of a thermal conditioning system according to yet another variant of the second embodiment
- Figure 10 is a curve showing the evolution over time of the operation of a thermal conditioning system according to the state of the art
- Figure 11 is a curve diagramming the evolution over time of the operation of a thermal conditioning system according to the invention.
- a first element upstream of a second element means that the first element is placed before the second element with respect to the direction of circulation, or course, of a fluid.
- a first element downstream of a second element means that the first element is placed after the second element with respect to the direction of circulation, or travel, of the fluid in question.
- the term “a first element is upstream of a second element” means that the refrigerant successively passes through the first element, then the second element, without passing through the compression device 2. Otherwise said, the refrigerant leaves the compression device 2, possibly crosses one or more elements, then crosses the first element, then the second element, then returns to the inlet 2a of the compression device 2, possibly after having crossed other elements.
- An electronic control unit receives information from various sensors measuring in particular the characteristics of the refrigerant at various points in the circuit.
- the electronic unit also receives the instructions requested by the occupants of the vehicle, such as the desired temperature inside the passenger compartment.
- the electronic unit implements control laws allowing the piloting of the various actuators, in order to ensure the control of the thermal conditioning system 100.
- the thermal conditioning system 100 comprises a compression device 2 making it possible to put the refrigerant fluid under pressure and to circulate it in the refrigerant fluid circuit 1.
- the compression device 2 can be an electric compressor, it is i.e. a compressor whose moving parts are driven by an electric motor.
- the compression device 2 comprises a suction side of the low-pressure refrigerant fluid, also called inlet 2a of the compression device 2, and a delivery side of the high pressure refrigerant fluid, also called outlet 2b of the compression device 2.
- the internal moving parts of the compressor 2 cause the refrigerant fluid to pass from a low pressure on the inlet side 2a to a high pressure on the outlet side 2b. After expansion in one or more expansion devices of circuit 1, the refrigerant fluid returns to the inlet of compressor 2 and begins a new thermodynamic cycle.
- connection point allows the refrigerant to pass through one or other of the circuit portions joining at this connection point.
- the distribution of the refrigerant fluid between the two portions of the circuit joining at a connection point is done by playing on the opening or closing of stop valves or expansion devices included on each of the two branches.
- each connection point is a means of redirecting the fluid arriving at this connection point.
- the refrigerant used by the refrigerant circuit 1 is here a chemical fluid such as R1234yf.
- Other refrigerants could be used, such as R134a for example.
- thermal conditioning system 100 comprising a circuit 1 of refrigerant fluid configured to circulate a refrigerant fluid, the circuit 1 of refrigerant fluid comprising:
- a condenser 3 configured to exchange heat with a first heat transfer fluid
- bypass branch B connecting a first connection point 11 arranged on the main loop A downstream of the condenser 3 and upstream of the first expansion device 4 to a second connection point 12 arranged on the main loop A downstream of the first evaporator 5 and upstream of the compression device 2,
- the bypass branch B comprising a second device for expansion device 6 and a second evaporator 7, in which the second expansion device 6 is a thermostatic type expansion valve configured to vary a flow section of the refrigerant fluid between a minimum flow section Smin and a maximum flow section Smax, and in which the bypass branch B comprises a passage restriction device 8 configured to limit a passage section of the refrigerant fluid to a value lower than the maximum passage section Smax of the second expansion device 6.
- the thermal conditioning system 100 is a thermal conditioning system for a motor vehicle.
- the second expansion device 6 is arranged upstream of the second evaporator 7. This means that the refrigerant fluid is expanded upstream of the second evaporator 7.
- the passage restriction device 8 is separate from the second trigger device 6.
- Condenser 3 is a heat exchanger configured to ensure condensation of the refrigerant fluid. The heat given off by the condensation of the refrigerant fluid is transferred to the first heat transfer fluid.
- the first heat transfer fluid here is a flow of Fe air outside the passenger compartment of a motor vehicle.
- exterior air flow Fe is meant an air flow which is not intended for the passenger compartment. In other words, this air flow remains outside the vehicle.
- a motorized fan unit arranged in the immediate vicinity of the condenser 3, not shown, can be activated in order to increase, if necessary, the flow rate of the outside air flow Fe.
- the first heat transfer fluid is a heat transfer liquid.
- the heat transfer liquid can circulate in a heat transfer liquid circuit comprising a heat exchanger arranged in the passenger compartment of the vehicle. The heating of the passenger compartment of the vehicle is ensured in particular by this heat exchanger.
- the first evaporator 5 is configured to exchange heat with a second heat transfer fluid.
- the second heat transfer fluid here is a flow of air Fi inside the passenger compartment of the vehicle.
- Interior air flow Fi means an air flow intended for the passenger compartment of the motor vehicle.
- This indoor air flow can circulate in a heating, ventilation and air conditioning installation, generally referred to by the English term “HVAC” meaning “Heating, Ventilating and Air Conditioning”.
- HVAC heating, ventilation and air conditioning
- This installation has not been shown in the figures.
- another motor-fan unit also not shown in the figures, is arranged in the heating installation in order to increase, if necessary, the flow rate of the interior air flow Fi on the first evaporator 5.
- the second evaporator 7 is here thermally coupled with an element 30 of an electric traction chain of the vehicle.
- the element 30 of the electric traction chain is for example a battery 30 for storing electrical energy.
- the heat exchange between the electrical energy storage battery 30 and the second evaporator 7 is direct, that is to say without the intervention of another heat transfer fluid.
- the wall of the second evaporator 7 absorbs the heat from the battery.
- the second evaporator 7 is attached to the battery 30 for storing electrical energy.
- the element 30 of the electric traction chain can be an electronic module for controlling an electric traction motor of the vehicle.
- the second connection point 12 is arranged upstream of the compression device 2. This means that the second connection point 12 is arranged upstream of an inlet 2a of the compression device 2.
- the coolant passage section is defined as the surface of a cross section of the coolant circuit 1.
- the refrigerant circuit 1 comprises several tubes and hoses connected together.
- the flow section of the coolant 1 can vary at various points of the coolant circuit.
- the passage section is the area of a disk whose diameter is the inside diameter of the tube.
- the passage restriction device 8 makes it possible to limit the flow of refrigerant fluid sent to the second evaporator 7, without having to modify the elements of the second expansion device 6 which participate in the regulation of the passage section of the refrigerant fluid .
- the passage restriction 8 makes it possible to obtain operation with a flow rate regular coolant in the second evaporator 7.
- This case corresponds for example to a case where the battery 30 needs to receive a slight cooling.
- This case can occur when the ambient temperature is moderate and the power dissipated is itself moderate, for example when the vehicle does not exceed 50 km/h on a level road and with a nominal total rolling weight.
- FIG. 10 schematically illustrates the operation of a thermal conditioning system according to the state of the art.
- the curve 40 corresponds to the evolution of the temperature at a given point of the second evaporator 7.
- the set point temperature of the refrigerant fluid in the second evaporator is T_1.
- T_1 The set point temperature of the refrigerant fluid in the second evaporator.
- the second expansion device 6 which is a thermostatic expansion valve, opens and causes refrigerant fluid to circulate in the second evaporator 7.
- the temperature decreases.
- the temperature is lower than the setpoint T_1 and continues to drop, the flow rate of refrigerant must therefore decrease.
- the second expansion device 6 closes and prevents the circulation of refrigerant fluid in the second evaporator 7. The temperature therefore rises.
- FIG 11 illustrates the operation of a thermal conditioning system according to the invention, under the same conditions in terms of cooling requirement and setpoint temperature.
- the instant tO corresponds to the instant when the thermostatic expansion valve 6 opens and causes refrigerant fluid to circulate in the second evaporator 7. Thanks to the passage restriction device 8, the flow rate of refrigerant fluid can be sufficiently low. , while being non-zero, to ensure the cooling power sought by the regulation.
- the thermostatic expansion valve 6 then operates over an opening range in which regulation of the flow is possible without going as far as operating phases at zero flow.
- the circulation of refrigerant fluid can be maintained continuously.
- the temperature within the second evaporator 7 undergoes fewer variations over time and can be controlled more precisely.
- the passage restriction device 8 is configured to limit a refrigerant passage section to a value less than 30% of the maximum passage section Smax of the second expansion device 6. For example, for a passage diameter of 18 millimeters, the corresponding passage section is about 254 square millimeters. In the case of a passage restriction device comprising a calibrated orifice 4 millimeters in diameter, the passage section is approximately 12.5 square millimeters, which represents approximately 5% of the maximum passage section.
- the first expansion device 4 can be an electronic expansion valve, a thermostatic expansion valve, or a calibrated orifice.
- An electronic-type expansion valve comprises an electric motor for moving a movable shutter which controls the passage section offered to the refrigerant fluid. At least one position sensor makes it possible to achieve the servo-control in position of the movable shutter.
- the electronic control unit controls the electronic expansion valve.
- the second expansion device 6 is a thermostatic expansion valve. As illustrated in FIGS. 2 to 9, the second expansion device 6 comprises a first conduit 9 for the circulation of refrigerant fluid configured to supply the second evaporator 7 and a second conduit 10 for the circulation of refrigerant fluid configured to receive the refrigerant fluid at the outlet. of the second evaporator 7.
- the second expansion device 6 comprises a movable shutter 14 configured to vary a passage section of the first duct 9 under the action of a thermally sensitive element 13 placed in the second duct 10.
- the passage restriction device 8 is arranged in the second conduit 10.
- the passage restriction device 8 is integrated into the second trigger device 6.
- the first coolant circulation conduit 9 and the second coolant circulation conduit 10 are here part of the same foundry body.
- the movable shutter 14 of the second expansion device 6 is movable under the action of a return spring 15 and under the action of the thermally sensitive element 13.
- the thermally sensitive element 13 comprises a membrane 16 subjected to the pressure of a fluid disposed in a receptacle disposed in the flow of refrigerant fluid leaving the second evaporator 7.
- the fluid is thus substantially at the same temperature as the refrigerant fluid exiting from the evaporator.
- the fluid contained in the receptacle exerts sufficient force on the membrane 16 to move the movable shutter 14 and increase the section through which the coolant passes.
- the flow rate of refrigerant fluid therefore increases, which increases the heat absorbed in the evaporator and decreases the temperature of the refrigerant fluid leaving the evaporator. Regulation is thus ensured.
- the thermally sensitive element 13 is subjected to a temperature substantially equal to the temperature of the refrigerant fluid leaving the second evaporator 7.
- the passage restriction device 8 is arranged upstream of the thermally sensitive element 13.
- the passage restriction device 8 is arranged downstream of an inlet 10a of the second conduit 10, and upstream of the thermally sensitive element 13. In other words, the refrigerant fluid leaving the second evaporator 7 first passes through the passage restriction device 8 before reaching the thermally sensitive element 13.
- the passage restriction device 8 is arranged downstream of the thermally sensitive element 13.
- the passage restriction device 8 is arranged downstream of the thermally sensitive element 13, and upstream of an outlet 10b of the second conduit 10. In other words, the refrigerant fluid leaving the second evaporator 7 first passes through the thermally sensitive element 13 before reaching the passage restriction device 8.
- the passage restriction device 8 is a diaphragm comprising a calibrated orifice 17.
- the general shape of the diaphragm is that of a disc .
- the thickness of the disc is less than its radius.
- a passage section of the calibrated orifice 17 is fixed. In other words, the passage section of the calibrated orifice 17 cannot be modified during the operation of the thermal conditioning system 100. A modification of the passage section of the passage restriction device 8 cannot be made only by dismantling and modifying the internal elements of the device, in order to mount a diaphragm having different characteristics.
- the diaphragm is cylindrical.
- the calibrated orifice 17 is cylindrical and coaxial with an axis D1 of the diaphragm.
- the diaphragm is for example metallic.
- the calibrated orifice can for example be obtained by drilling.
- the passage restriction device 8 is simple to manufacture and to develop.
- a passage section of the calibrated orifice 17 is between 0.5% and 10% of the maximum passage section Smax of the second expansion device 6.
- the second expansion device 6 comprises a receiving housing 18 of the diaphragm, the diaphragm being disposed in the receiving housing 18. interface between the housing 18 and the diaphragm is sealed. In other words, the coolant can only pass through the calibrated orifice 17.
- the housing 18 can for example be obtained by machining the cast body of the second expansion device 6.
- the refrigerant circuit 1 comprises a hose 19 connected to the second expansion device 6, the hose 19 comprising a flange 20 for connection with the second device trigger 6, and the flange 20 comprises a housing 21 for receiving the diaphragm, the diaphragm being placed in the receiving housing 21.
- the second trigger device 6 is necessary to install the diaphragm forming a restriction of the passing section.
- the passage restriction device 8 is arranged downstream of the second expansion device 6.
- the passage restriction device 8 is arranged downstream of the second conduit 10 for the circulation of refrigerant fluid receiving the refrigerant fluid which leaves the second evaporator 7.
- the passage restriction device 8 is a valve comprising a conduit 22 for fluid circulation and a shutter mobile 23 arranged in the duct, the mobile shutter 23 being configured to vary a passage section of the duct 22 of the valve.
- the second embodiment differs from the first embodiment in that the section of the passage restriction can vary over time in order to adapt to the needs of the temperature regulation.
- the movable shutter 23 can assume a position such that the conduit 22 is fully open, so as not to limit the flow rate of refrigerant fluid.
- the movable shutter restricts the passage of the refrigerant fluid according to the principle described above.
- a stop function is available. In this case, it is not necessary to provide another stop valve.
- the thermostatic expansion valve 6 then does not need to incorporate a shut-off valve.
- the passage restriction device 8 comprises an electric motor 24 configured to move the movable shutter 23.
- the electric motor 24 may be a DC motor.
- Electric motor 24 may be a stepper motor.
- the passage restriction device 8 and the second expansion device 6 are adjacent.
- adjacent is meant that the passage restriction device 8 and the second expansion device 6 are connected to each other, possibly with an interposed seal.
- the passage restriction device 8 and the second expansion device 6 can be fixed to each other, for example by screws passing through a fixing flange of each device.
- the passage restriction device 8 and the second trigger device 6 are part of the same body.
- the body can for example be a foundry body, that is to say obtained by molding a metal alloy.
- the various fluid passage ducts and the various housings receiving the components of the second expansion device 6 and of the passage restriction device 8 are made in a single body.
- the passage restriction device 8 and the second expansion device 6 are connected by a hose 19.
- the hose connecting the passage restriction device 8 and the second expansion device 6 has a length of less than 10 centimeters.
- the fluid circulation conduit 22 of the passage restriction device 8 is coaxial with the second fluid circulation conduit 10 of the second expansion device 6.
- the conduit 22 and the conduit 10 both extend along the axis D2.
- the movable shutter 23 of the passage restriction device 8 is a rotating ball comprising a through recess 25 configured to form a portion of fluid circulation conduit .
- the rotating ball 23 is linked to an axis rotation shaft D3.
- the axis of rotation D3 of the rotary ball and an axis D2 of the fluid circulation conduit 22 of the passage restriction device 8 are perpendicular.
- the through recess 25 is for example cylindrical and extends along an axis D4.
- the axis of rotation D3 of the rotary ball and an axis D4 of the through recess 25 are perpendicular.
- the coolant passes through the through recess 25.
- a portion of the periphery of the rotating ball 23 seals between the rotating ball 23 and the conduit 22 for fluid circulation.
- the movable shutter 23 of the passage restriction device 8 is a movable valve in translation.
- the movable shutter 23 of the passage restriction device 8 is a rotary flap configured to pivot in the conduit 22 for fluid circulation.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid Mechanics (AREA)
- Air-Conditioning For Vehicles (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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CN202280035210.7A CN117321353A (zh) | 2021-03-15 | 2022-03-15 | 热调节回路 |
EP22715059.6A EP4308862A1 (fr) | 2021-03-15 | 2022-03-15 | Système de conditionnement thermique |
US18/550,296 US20240157762A1 (en) | 2021-03-15 | 2022-03-15 | Thermal conditioning circuit |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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FRFR2102563 | 2021-03-15 | ||
FR2102563 | 2021-03-15 |
Publications (1)
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WO2022194902A1 true WO2022194902A1 (fr) | 2022-09-22 |
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PCT/EP2022/056765 WO2022194902A1 (fr) | 2021-03-15 | 2022-03-15 | Système de conditionnement thermique |
Country Status (4)
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US (1) | US20240157762A1 (fr) |
EP (1) | EP4308862A1 (fr) |
CN (1) | CN117321353A (fr) |
WO (1) | WO2022194902A1 (fr) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0907057A1 (fr) * | 1997-10-03 | 1999-04-07 | Eaton Corporation | Soupape thermostatique de détente avec soupape d'admission intégrée actionnée par électricité |
WO2011128527A1 (fr) * | 2010-04-16 | 2011-10-20 | Valeo Systemes Thermiques | Dispositif de détente thermostatique et boucle de climatisation comprenant un tel dispositif de détente thermostatique |
US20200109884A1 (en) * | 2018-10-08 | 2020-04-09 | Denso Automotive Deutschland Gmbh | Heat exchange system and refrigerant cycle including heat exchange system |
-
2022
- 2022-03-15 WO PCT/EP2022/056765 patent/WO2022194902A1/fr active Application Filing
- 2022-03-15 EP EP22715059.6A patent/EP4308862A1/fr active Pending
- 2022-03-15 CN CN202280035210.7A patent/CN117321353A/zh active Pending
- 2022-03-15 US US18/550,296 patent/US20240157762A1/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0907057A1 (fr) * | 1997-10-03 | 1999-04-07 | Eaton Corporation | Soupape thermostatique de détente avec soupape d'admission intégrée actionnée par électricité |
WO2011128527A1 (fr) * | 2010-04-16 | 2011-10-20 | Valeo Systemes Thermiques | Dispositif de détente thermostatique et boucle de climatisation comprenant un tel dispositif de détente thermostatique |
US20200109884A1 (en) * | 2018-10-08 | 2020-04-09 | Denso Automotive Deutschland Gmbh | Heat exchange system and refrigerant cycle including heat exchange system |
Also Published As
Publication number | Publication date |
---|---|
EP4308862A1 (fr) | 2024-01-24 |
CN117321353A (zh) | 2023-12-29 |
US20240157762A1 (en) | 2024-05-16 |
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