US20070095098A1 - Expansion valve for rear seat air conditioner - Google Patents
Expansion valve for rear seat air conditioner Download PDFInfo
- Publication number
- US20070095098A1 US20070095098A1 US11/584,851 US58485106A US2007095098A1 US 20070095098 A1 US20070095098 A1 US 20070095098A1 US 58485106 A US58485106 A US 58485106A US 2007095098 A1 US2007095098 A1 US 2007095098A1
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- United States
- Prior art keywords
- air conditioner
- orifice
- expansion valve
- ball
- seat air
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
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- 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
- B60H1/00485—Valves for air-conditioning devices, e.g. thermostatic valves
-
- 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
- B60H1/00007—Combined heating, ventilating, or cooling devices
- B60H1/00207—Combined heating, ventilating, or cooling devices characterised by the position of the HVAC devices with respect to the passenger compartment
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- 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
- F16K7/00—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves
- F16K7/12—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with flat, dished, or bowl-shaped diaphragm
- F16K7/14—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with flat, dished, or bowl-shaped diaphragm arranged to be deformed against a flat seat
- F16K7/17—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with flat, dished, or bowl-shaped diaphragm arranged to be deformed against a flat seat the diaphragm being actuated by fluid pressure
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- 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
- F25B31/00—Compressor arrangements
- F25B31/002—Lubrication
- F25B31/004—Lubrication oil recirculating arrangements
-
- 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
-
- 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
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- 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
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- 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
- B60H1/00007—Combined heating, ventilating, or cooling devices
- B60H1/00207—Combined heating, ventilating, or cooling devices characterised by the position of the HVAC devices with respect to the passenger compartment
- B60H2001/00242—Devices in the rear area of the passenger compartment
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- 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
- F25B2341/00—Details of ejectors not being used as compression device; Details of flow restrictors or expansion valves
- F25B2341/06—Details of flow restrictors or expansion valves
- F25B2341/068—Expansion valves combined with a sensor
- F25B2341/0683—Expansion valves combined with a sensor the sensor is disposed in the suction line and influenced by the temperature or the pressure of the suction gas
Definitions
- the present invention relates to an expansion valve for a rear seat air conditioner of an automotive vehicle, and more particularly, to an expansion valve for a rear seat air conditioner of an automotive vehicle, which can circulate a flow of refrigerant stagnated between a compressor and the rear seat air conditioner through a bleeding channel of the expansion valve when only a front seat air conditioner is operated stopping operation of the rear seat air conditioner, thereby supplying oil contained in refrigerant between the compressor and the rear seat air conditioner to the compressor.
- a rear seat air conditioner for a vehicle is applied to automotive vehicles of a large capacity, for instance, vans, RVs (Recreational Vehicles), or deluxe vehicles, as large as only a front seat air conditioner cannot agreeably cool or heat the inside of the vehicle.
- the rear seat air conditioner is installed in a sealed space of the rear of the vehicle in link with the front seat air conditioner, and so, constitutes a dual air conditioner together with the front seat air conditioner.
- a dual air conditioner shown in FIG. 1 includes a front seat air conditioner 10 and a rear seat air conditioner 30 .
- the front seat air conditioner 10 includes: a compressor 12 for compressing and discharging refrigerant; a condenser 14 for condensing refrigerant discharged from the compressor 12 ; a receiver dryer 16 for separating gas from the condensed refrigerant; a front expansion valve 18 for expanding refrigerant discharged from the receiver dryer 16 ; a front evaporator 22 embedded in a front air conditioning case 20 for converting the air into cold air by thermally exchanging refrigerant supplied from the front expansion valve 18 and air blown from a front air blast 26 and sending refrigerant to the compressor 12 ; and a front heater core 24 embedded in the front air conditioning case 20 for converting the air into hot air by thermally exchanging cooling water flowing therein and air blown from the front air blast 26 .
- the rear seat air conditioner 30 includes: a rear expansion valve 34 for expanding refrigerant discharged from the receiver dryer 16 of the front seat air conditioner 10 ; a rear evaporator 36 embedded in a rear air conditioning case 32 for converting the air into cold air by thermally exchanging refrigerant supplied from the rear expansion valve 34 and air blown from a rear seat air blast 40 and sending refrigerant to the compressor 12 ; and a rear heater core 38 embedded in the rear air conditioning case 32 for converting the air into hot air by thermally exchanging cooling water flowing therein and air blown from the front air blast 40 .
- the front expansion valve 18 or the rear expansion valve 34 is mounted on an inlet of the front evaporator 22 or the rear evaporator 36 and expands refrigerant of high temperature and high pressure discharged from the receiver dryer 16 to convert it into a low pressure state of a dew form and supply it to the evaporator, thereby increasing evaporation efficiency.
- the expansion valves 18 and 34 serves to adjust the flow rate of refrigerant.
- FIG. 2 shows an example of the rear expansion valve 34 of the expansion valves 18 and 34 .
- the rear expansion valve 34 includes: a valve block 50 ; a low-pressure refrigerant channel 52 horizontally mounted on the upper end part of the valve block 50 for connecting the compressor 12 with the outlet of the rear evaporator 36 ; a high-pressure refrigerant channel 54 horizontally mounted on the lower end part of the valve block 50 and having an entrance portion 55 connected to the receiver dryer 16 , a discharge portion 56 connected to the inlet of the rear evaporator 36 , and an orifice 57 for connecting the entrance portion 55 and the discharge portion 56 with each other; a temperature sensing bulb 60 mounted on the upper end of the valve block 50 ; a pressure delivery bar 64 liftably mounted across the low-pressure refrigerant channel 52 and the orifice 57 of the high-pressure refrigerant channel 54 from the temperature sensing bulb 60 ; and a ball valve 68 mounted on a communication path 66 fluidically communicating with the orifice 57 and the entrance
- the oil circulation rate is reduced from the time when operation of the rear seat air conditioner 30 is stopped, and so, it may have a bad influence on durability of the compressor 12 , for instance, sticking of the compressor 12 , due to a lack of lubrication and cause a serious operational noise of the compressor 12 as operational time of the compressor 12 passes.
- the present invention has been made to solve the above problems occurring in the prior arts, and it is an object of the present invention to provide an expansion valve for a rear seat air conditioner of an automotive vehicle, which can circulate a flow of refrigerant stagnated between a compressor and the rear seat air conditioner through a bleeding channel of the expansion valve for the rear seat air conditioner when a front seat air conditioner is operated stopping the operation of the rear seat air conditioner, thereby supplying oil contained in refrigerant between the compressor and the rear seat air conditioner to the compressor.
- an expansion valve for a rear seat air conditioner of an automotive vehicle including: a low-pressure refrigerant channel for connecting an outlet of a rear evaporator with a compressor; a high-pressure refrigerant channel having an entrance portion for introducing condensed refrigerant into the high-pressure refrigerant channel, a discharge portion connected to an inlet of the rear evaporator, and an orifice for connecting the entrance portion and the discharge portion with each other; a pressure delivery bar liftably mounted across the low-pressure refrigerant channel and the orifice of the high-pressure refrigerant channel; a temperature sensing bulb connected with the pressure delivery bar; and a ball valve mounted on a communication path fluidically communicating with the orifice and the entrance portion for adjusting an opening degree of the orifice in link with the pressure delivery bar, wherein the orifice includes a slant enlarged portion formed on the communication path side so that a ball of the ball valve is seated on the slant
- the bleeding channel includes a groove formed on the slant enlarged portion.
- the bleeding channel includes a groove or a concave formed on the ball side, which is in contact with the slant enlarged portion.
- the orifice includes a straight portion formed on the discharge portion side, a diameter of the straight portion is within the range of 2.6 mm to 3.1 mm, and a diameter of the ball of the ball valve is within the range of 3.1 mm to 3.5 mm.
- the bleeding channel has two to twelve grooves.
- a sectional area of the entire passageway of the grooves is corresponded to a sectional area of a circle, which has a diameter ranging 0.3 mm to 0.8 mm.
- the diameter is an equivalent diameter of the circle when a sectional area of the entire passageway of the grooves is converted into a circle.
- FIG. 1 is a structural view showing an automotive vehicle to which a dual air conditioner is applied;
- FIG. 2 is a sectional view of a prior art expansion valve for a prior art rear seat air conditioner
- FIG. 3 is a graph showing a change in an oil circulation rate by time when operation of the prior art rear seat air conditioner is stopped;
- FIG. 4 is a sectional view of an expansion valve for a rear seat air conditioner according to the present invention.
- FIG. 5 is a bottom enlarged view showing an example of an orifice of the expansion valve of FIG. 4 ;
- FIG. 6 is a bottom enlarged view showing another example of the orifice of the expansion valve of FIG. 4 ;
- FIG. 7 is a perspective view of a ball of a ball valve of the expansion valve according to the present invention.
- FIGS. 8 and 9 are graphs showing changes in an oil circulation rate by time when operation of the rear seat air conditioner to which the expansion valve of the present invention is applied is stopped.
- FIG. 4 shows an expansion valve for a rear seat air conditioner of an automotive vehicle according to the present invention.
- the expansion valve 100 for the rear seat air conditioner includes a valve block 110 , a low-pressure refrigerant channel 120 , a high-pressure refrigerant channel 130 , a temperature sensing bulb 180 , a pressure delivery bar 170 , and a ball valve 160 .
- the low-pressure refrigerant channel 120 is horizontally mounted on the upper end part of the valve block 110 to connect an outlet of a rear evaporator 36 (see FIG. 1 ) constituting the rear seat air conditioner 30 (see FIG. 1 ) with a compressor 12 (see FIG. 1 ).
- the high-pressure refrigerant channel 130 is horizontally mounted on the lower end part of the valve block 110 to connect an inlet of the rear evaporator 36 with a condenser 14 or a receiver dryer 16 (see FIG. 1 ).
- the high-pressure refrigerant channel 130 includes an entrance portion 132 connected with the condenser 14 or the receiver dryer 16 for introducing condensed refrigerant, a discharge portion 134 connected to the inlet of the rear evaporator 36 , and an orifice 136 for connecting the entrance portion 132 and the discharge portion 134 with each other.
- the temperature sensing bulb 180 is mounted on the top of the valve block 110 and connected with the pressure delivery bar 170 liftably mounted across the low-pressure refrigerant channel 120 and the orifice 136 of the high-pressure refrigerant channel 130 .
- a diaphragm 182 mounted below a gas chamber 184 inside the temperature sensing bulb 180 is connected with the pressure delivery bar 170 . Therefore, temperature of refrigerant flowing in the low-pressure refrigerant channel 120 is transferred to the gas chamber 184 through the pressure delivery bar 170 , and so, the pressure delivery bar 170 is liftable while the diaphragm 182 is vertically moved according to a pressure change of the gas chamber 184 .
- the ball valve 160 is to adjust an opening degree of the orifice 136 in link with the pressure delivery bar 170 , and mounted on a communication path 150 passing through the orifice 136 and the entrance portion 132 .
- the ball valve 160 is arranged in close with the bottom of the lower end of the pressure delivery bar 170 , and includes a ball 162 for adjusting the opening degree of the orifice 136 and a spring 164 for elastically supporting the ball 162 by interposing a support plate 166 between the ball 162 and the spring 164 .
- the expansion valve 100 for the rear seat air conditioner according to the present invention can circulate refrigerant between the rear seat air conditioner 30 and the compressor 12 even though the ball 162 of the ball valve 160 is seated on the orifice 136 in a state where only a front seat air conditioner 10 (see FIG. 1 ) is operated stopping the operation of the rear seat air conditioner 30 (see FIG. 1 ), whereby oil contained in refrigerant of the rear seat air conditioner 30 can be returned to the compressor 12 smoothly.
- a bleeding channel 140 is provided on the inner circumferential surface of the orifice 136 for fluidically communicating the communication path 150 and the discharge portion 134 with each other.
- the bleeding channel 140 includes a number of grooves 142 formed on the inner peripheral surface of the orifice 136 to fluidically communicate the communication path 150 and the discharge portion 134 with each other.
- the orifice 136 includes a straight portion 136 b of the discharge portion 134 side, and a slant enlarged portion 136 a of the communication path 150 side on which the ball 162 of the ball valve 160 is seated.
- FIG. 5 shows an example that three grooves 142 are formed
- FIG. 6 shows another example that six grooves 142 are formed, but it is preferable that six grooves 142 are formed in consideration of flow-ability and process-ability of refrigerant.
- the grooves 142 can be formed, for example, by a notching method.
- a diameter of the straight portion 136 b of the orifice is within the range of 2.6 mm to 3.1 mm and a diameter of the ball 162 of the ball valve 160 is within the range of 3.1 mm to 3.5 mm.
- a sectional area of the bleeding channel 140 namely, a sectional area of the entire passageway of the grooves 142 corresponds to a sectional area of a circle, which has a diameter of 0.3 mm to 0.8 mm.
- the grooves 142 of the bleeding channel 140 are formed on the inner peripheral surface of the slant enlarged portion 136 a , but may be formed on the outer peripheral surface of the ball 162 , which is in contact with the slant enlarged portion 136 a as shown in FIG. 7 .
- the grooves 162 a are formed on the outer peripheral surface of the ball 162 in a lattice form, but may be formed in one of various shapes.
- the bleeding channel 140 may have a concave (not shown) formed on the outer peripheral surface of the ball 162 .
- the ball 162 of the ball valve 160 may be formed in a spherical or conical shape or one of other shapes.
- a structure for adjusting the opening degree of the orifice 136 will be described in more detail.
- temperature of refrigerant discharged from the rear evaporator 36 to the low-pressure refrigerant channel 120 drops, temperature of refrigerant is transferred to the temperature sensing bulb 180 through the pressure deliver bar 170 . Therefore, temperature of the gas chamber 184 inside the temperature sensing bulb 180 drops and gas contained inside the gas chamber 184 is condensed, so that pressure of the gas chamber 184 is lowered and volume of the gas chamber 184 is reduced, whereby the diaphragm 182 mounted inside the temperature sensing bulb 180 is displaced upwardly.
- the pressure delivery bar 170 is moved upwardly in link with the displacement of the diaphragm 182 and the ball 162 of the ball valve 160 is moved upwardly by elasticity of the spring 164 , whereby the opening degree of the orifice 136 is reduced and the flow rate of refrigerant is reduced. Contrariwise, when temperature of refrigerant flowing inside the low-pressure refrigerant channel 120 rises, the pressure delivery bar 170 moves downwardly and the opening degree of the orifice 136 is increased, whereby the flow rate of refrigerant is increased.
- the orifice 136 is intercepted and refrigerant cannot be circulated between the compressor 12 and the rear seat air conditioner 30 and is stagnated. Therefore, oil contained in refrigerant located in the stagnated area is not supplied to the compressor 12 .
- refrigerant of a predetermined flow rate can be circulated between the compressor 12 and the rear seat air conditioner 30 through the bleeding channel 140 having the grooves 142 formed on the slant enlarged portion 136 a of the orifice 136 .
- refrigerant of the entrance portion 132 can be flown to the discharge portion 134 after passing through the straight portion 136 b of the orifice 136 through the communication path 150 and the bleeding channel 140 , whereby refrigerant of the predetermined flow rate can be circulated between the rear seat air conditioner 30 and the compressor 12 smoothly.
- FIGS. 8 and 9 are graphs showing changes in an oil circulation rate by time when operation of the rear seat air conditioner to which the expansion valve of the present invention is applied is stopped.
- FIG. 8 shows a case that the diameter of the bleeding channel 140 is 0.3 mm
- FIG. 9 shows a case that the diameter of the bleeding channel 140 is 0.4 mm.
- Table 1 is to compare the oil circulation rate between the expansion valve according to the present invention and the prior art expansion valve to which the bleeding channel is not applied in case of a dual mode that the front and rear seat air conditioners are all operated and in case of a single mode that only the front seat air conditioner is operated stopping the operation of the rear seat air conditioner.
- a dimension of the bleeding channel is indicated by converting a dimension corresponding to a sectional area of the entire passageway of the grooves 142 into a diameter of a circle.
- the expansion valve for the rear seat air conditioner of the automotive vehicle can circulate refrigerant between the compressor and the rear seat air conditioner since refrigerant of the predetermined flow rate introduced into the entrance portion 132 from the receiver dryer can flow to the discharge portion 134 , which is connected to the rear evaporator, through the bleeding channel 140 formed in the expansion valve even when operation of the rear seat air conditioner is stopped but only the front seat air conditioner is operated. Therefore, the present invention can smoothly supply oil contained in refrigerant between the compressor and the rear seat air conditioner to the compressor, thereby preventing bad influences on durability of the compressor, for example, sticking of the compressor due to a lack of lubrication as operation time of the compressor passes, and extending a lifespan of the compressor by protecting the compressor. In addition, the present invention can reduce operational noise of the compressor by raising a lubricating effect.
Abstract
The present invention relates to an expansion valve for a rear seat air conditioner of an automotive vehicle, which can circulate a flow of refrigerant stagnated between a compressor and the rear seat air conditioner through a bleeding channel of the expansion valve when only a front seat air conditioner is operated stopping the operation of the rear seat air conditioner, thereby supplying oil contained in refrigerant between the compressor and the rear seat air conditioner to the compressor.
Description
- 1. Field of the Invention
- The present invention relates to an expansion valve for a rear seat air conditioner of an automotive vehicle, and more particularly, to an expansion valve for a rear seat air conditioner of an automotive vehicle, which can circulate a flow of refrigerant stagnated between a compressor and the rear seat air conditioner through a bleeding channel of the expansion valve when only a front seat air conditioner is operated stopping operation of the rear seat air conditioner, thereby supplying oil contained in refrigerant between the compressor and the rear seat air conditioner to the compressor.
- 2. Background Art
- In general, a rear seat air conditioner for a vehicle is applied to automotive vehicles of a large capacity, for instance, vans, RVs (Recreational Vehicles), or deluxe vehicles, as large as only a front seat air conditioner cannot agreeably cool or heat the inside of the vehicle. The rear seat air conditioner is installed in a sealed space of the rear of the vehicle in link with the front seat air conditioner, and so, constitutes a dual air conditioner together with the front seat air conditioner.
- A dual air conditioner shown in
FIG. 1 includes a frontseat air conditioner 10 and a rearseat air conditioner 30. - The front
seat air conditioner 10 includes: acompressor 12 for compressing and discharging refrigerant; acondenser 14 for condensing refrigerant discharged from thecompressor 12; areceiver dryer 16 for separating gas from the condensed refrigerant; afront expansion valve 18 for expanding refrigerant discharged from thereceiver dryer 16; afront evaporator 22 embedded in a frontair conditioning case 20 for converting the air into cold air by thermally exchanging refrigerant supplied from thefront expansion valve 18 and air blown from afront air blast 26 and sending refrigerant to thecompressor 12; and afront heater core 24 embedded in the frontair conditioning case 20 for converting the air into hot air by thermally exchanging cooling water flowing therein and air blown from thefront air blast 26. - In addition, the rear
seat air conditioner 30 includes: arear expansion valve 34 for expanding refrigerant discharged from thereceiver dryer 16 of the frontseat air conditioner 10; arear evaporator 36 embedded in a rearair conditioning case 32 for converting the air into cold air by thermally exchanging refrigerant supplied from therear expansion valve 34 and air blown from a rearseat air blast 40 and sending refrigerant to thecompressor 12; and arear heater core 38 embedded in the rearair conditioning case 32 for converting the air into hot air by thermally exchanging cooling water flowing therein and air blown from thefront air blast 40. - Meanwhile, the
front expansion valve 18 or therear expansion valve 34 is mounted on an inlet of thefront evaporator 22 or therear evaporator 36 and expands refrigerant of high temperature and high pressure discharged from thereceiver dryer 16 to convert it into a low pressure state of a dew form and supply it to the evaporator, thereby increasing evaporation efficiency. - Since a thermal load of the air conditioner is changed by the outdoor temperature, humidity, the number of passengers, rotational frequency of the
compressor 12, and so on, there is a need to adjust a flow rate of refrigerant circulating inside a cycle to show the best capability of each units coping with the change, and so, theexpansion valves - Moreover, if the thermal load is large in a state where the refrigerant amount is uniform, when refrigerant arrives at an outlet of the
evaporator compressor 12 rises, and so, a cylinder (not shown) of thecompressor 12 is heated. On the contrary, if the thermal load is small, refrigerant is not completely evaporated event at an outlet of theevaporator compressor 12 to cause liquid compression, and thereby, a valve unit (not shown) of thecompressor 12 is damaged. Theexpansion valves evaporators -
FIG. 2 shows an example of therear expansion valve 34 of theexpansion valves rear expansion valve 34 includes: avalve block 50; a low-pressure refrigerant channel 52 horizontally mounted on the upper end part of thevalve block 50 for connecting thecompressor 12 with the outlet of therear evaporator 36; a high-pressure refrigerant channel 54 horizontally mounted on the lower end part of thevalve block 50 and having anentrance portion 55 connected to thereceiver dryer 16, adischarge portion 56 connected to the inlet of therear evaporator 36, and anorifice 57 for connecting theentrance portion 55 and thedischarge portion 56 with each other; atemperature sensing bulb 60 mounted on the upper end of thevalve block 50; apressure delivery bar 64 liftably mounted across the low-pressure refrigerant channel 52 and theorifice 57 of the high-pressure refrigerant channel 54 from thetemperature sensing bulb 60; and aball valve 68 mounted on acommunication path 66 fluidically communicating with theorifice 57 and theentrance portion 55 to adjust an opening degree of theorifice 57 in link with thepressure delivery bar 64. - Operation of the
rear expansion valve 34 will be described. When refrigerant is introduced from thereceiver dryer 16 to theentrance portion 55 of the high-pressure refrigerant channel 54, the opening degree of theorifice 57 is adjusted according to ascent and descent of aball 69 of theball valve 68 due to a vertical movement of thepressure delivery bar 64. Therefore, refrigerant introduced into theentrance portion 55 can be supplied to therear evaporator 36 through thecommunication path 66, theorifice 57 and thedischarge portion 56 in order while adjusting its flow rate. That is, when temperature of refrigerant discharged from therear evaporator 36 to the low-pressure refrigerant channel 52 is lowered, temperature of refrigerant is transferred to thetemperature sensing bulb 60 through thepressure delivery bar 64. Therefore, temperature of agas chamber 62 inside thetemperature sensing bulb 60 is lowered, a diaphragm 61 mounted inside thetemperature sensing bulb 60 is displaced upwardly, whereby thepressure delivery bar 64 is moved upwardly and the opening degree of theorifice 57 is reduced, so that the flow rate of refrigerant is reduced. On the contrary, when temperature of refrigerant flowing inside the low-pressure refrigerant channel 52 rises, the flow rate of refrigerant is increased. - However, in case of an automotive vehicle to which the dual air conditioner shown in
FIG. 1 is applied, when there is no passenger on the rear seat, generally, only the frontseat air conditioner 10 is operated stopping the operation of the rear seat air conditioner. In this instance, in the state where the prior artrear expansion valve 34 is applied, since theorifice 57 is intercepted, refrigerant circulation between thecompressor 12 and the rearseat air conditioner 30 is stagnated. An oil content of refrigerant introduced into thecompressor 12 may be indicated as an oil circulation rate. Since refrigerant circulation between thecompressor 12 and the rearseat air conditioner 30 is stagnated, oil contained in refrigerant in the stagnated area cannot be supplied to thecompressor 12. Therefore, as shown inFIG. 3 , the oil circulation rate is reduced from the time when operation of the rearseat air conditioner 30 is stopped, and so, it may have a bad influence on durability of thecompressor 12, for instance, sticking of thecompressor 12, due to a lack of lubrication and cause a serious operational noise of thecompressor 12 as operational time of thecompressor 12 passes. - Accordingly, the present invention has been made to solve the above problems occurring in the prior arts, and it is an object of the present invention to provide an expansion valve for a rear seat air conditioner of an automotive vehicle, which can circulate a flow of refrigerant stagnated between a compressor and the rear seat air conditioner through a bleeding channel of the expansion valve for the rear seat air conditioner when a front seat air conditioner is operated stopping the operation of the rear seat air conditioner, thereby supplying oil contained in refrigerant between the compressor and the rear seat air conditioner to the compressor.
- To accomplish the above object, according to the present invention, there is provided an expansion valve for a rear seat air conditioner of an automotive vehicle including: a low-pressure refrigerant channel for connecting an outlet of a rear evaporator with a compressor; a high-pressure refrigerant channel having an entrance portion for introducing condensed refrigerant into the high-pressure refrigerant channel, a discharge portion connected to an inlet of the rear evaporator, and an orifice for connecting the entrance portion and the discharge portion with each other; a pressure delivery bar liftably mounted across the low-pressure refrigerant channel and the orifice of the high-pressure refrigerant channel; a temperature sensing bulb connected with the pressure delivery bar; and a ball valve mounted on a communication path fluidically communicating with the orifice and the entrance portion for adjusting an opening degree of the orifice in link with the pressure delivery bar, wherein the orifice includes a slant enlarged portion formed on the communication path side so that a ball of the ball valve is seated on the slant enlarged portion, and wherein the orifice has a bleeding channel formed on an inner circumferential surface thereof so as to fluidically communicate the communication path and the discharge portion with each other even when the ball of the ball valve is seated on the slant enlarged portion.
- It is preferable that the bleeding channel includes a groove formed on the slant enlarged portion.
- Moreover, it is preferable that the bleeding channel includes a groove or a concave formed on the ball side, which is in contact with the slant enlarged portion.
- Furthermore, it is preferable that the orifice includes a straight portion formed on the discharge portion side, a diameter of the straight portion is within the range of 2.6 mm to 3.1 mm, and a diameter of the ball of the ball valve is within the range of 3.1 mm to 3.5 mm.
- In addition, it is preferable that the bleeding channel has two to twelve grooves.
- Additionally, it is preferable that a sectional area of the entire passageway of the grooves is corresponded to a sectional area of a circle, which has a diameter ranging 0.3 mm to 0.8 mm. The diameter is an equivalent diameter of the circle when a sectional area of the entire passageway of the grooves is converted into a circle.
- The above and other objects, features and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments of the invention in conjunction with the accompanying drawings, in which:
-
FIG. 1 is a structural view showing an automotive vehicle to which a dual air conditioner is applied; -
FIG. 2 is a sectional view of a prior art expansion valve for a prior art rear seat air conditioner; -
FIG. 3 is a graph showing a change in an oil circulation rate by time when operation of the prior art rear seat air conditioner is stopped; -
FIG. 4 is a sectional view of an expansion valve for a rear seat air conditioner according to the present invention; -
FIG. 5 is a bottom enlarged view showing an example of an orifice of the expansion valve ofFIG. 4 ; -
FIG. 6 is a bottom enlarged view showing another example of the orifice of the expansion valve ofFIG. 4 ; -
FIG. 7 is a perspective view of a ball of a ball valve of the expansion valve according to the present invention; and -
FIGS. 8 and 9 are graphs showing changes in an oil circulation rate by time when operation of the rear seat air conditioner to which the expansion valve of the present invention is applied is stopped. - Reference will be now made in detail to the preferred embodiment of the present invention with reference to the attached drawings. Terms and words used in this specification and claims should be interpreted as meaning and concept corresponding to the technical idea of the present invention based on the principle that the inventor can properly define the concept of words to explain the inventor's invention in the best way.
-
FIG. 4 shows an expansion valve for a rear seat air conditioner of an automotive vehicle according to the present invention. - The
expansion valve 100 for the rear seat air conditioner according to the present invention includes avalve block 110, a low-pressure refrigerant channel 120, a high-pressure refrigerant channel 130, atemperature sensing bulb 180, apressure delivery bar 170, and aball valve 160. - The low-
pressure refrigerant channel 120 is horizontally mounted on the upper end part of thevalve block 110 to connect an outlet of a rear evaporator 36 (seeFIG. 1 ) constituting the rear seat air conditioner 30 (seeFIG. 1 ) with a compressor 12 (seeFIG. 1 ). - In addition, the high-
pressure refrigerant channel 130 is horizontally mounted on the lower end part of thevalve block 110 to connect an inlet of therear evaporator 36 with acondenser 14 or a receiver dryer 16 (seeFIG. 1 ). The high-pressure refrigerant channel 130 includes anentrance portion 132 connected with thecondenser 14 or thereceiver dryer 16 for introducing condensed refrigerant, adischarge portion 134 connected to the inlet of therear evaporator 36, and anorifice 136 for connecting theentrance portion 132 and thedischarge portion 134 with each other. - Moreover, the
temperature sensing bulb 180 is mounted on the top of thevalve block 110 and connected with thepressure delivery bar 170 liftably mounted across the low-pressure refrigerant channel 120 and theorifice 136 of the high-pressure refrigerant channel 130. In this instance, adiaphragm 182 mounted below agas chamber 184 inside thetemperature sensing bulb 180 is connected with thepressure delivery bar 170. Therefore, temperature of refrigerant flowing in the low-pressure refrigerant channel 120 is transferred to thegas chamber 184 through thepressure delivery bar 170, and so, thepressure delivery bar 170 is liftable while thediaphragm 182 is vertically moved according to a pressure change of thegas chamber 184. - The
ball valve 160 is to adjust an opening degree of theorifice 136 in link with thepressure delivery bar 170, and mounted on acommunication path 150 passing through theorifice 136 and theentrance portion 132. Theball valve 160 is arranged in close with the bottom of the lower end of thepressure delivery bar 170, and includes aball 162 for adjusting the opening degree of theorifice 136 and aspring 164 for elastically supporting theball 162 by interposing asupport plate 166 between theball 162 and thespring 164. - The
expansion valve 100 for the rear seat air conditioner according to the present invention can circulate refrigerant between the rearseat air conditioner 30 and thecompressor 12 even though theball 162 of theball valve 160 is seated on theorifice 136 in a state where only a front seat air conditioner 10 (seeFIG. 1 ) is operated stopping the operation of the rear seat air conditioner 30 (seeFIG. 1 ), whereby oil contained in refrigerant of the rearseat air conditioner 30 can be returned to thecompressor 12 smoothly. To this end, ableeding channel 140 is provided on the inner circumferential surface of theorifice 136 for fluidically communicating thecommunication path 150 and thedischarge portion 134 with each other. - As shown in FIGS. 4 to 6, the
bleeding channel 140 includes a number ofgrooves 142 formed on the inner peripheral surface of theorifice 136 to fluidically communicate thecommunication path 150 and thedischarge portion 134 with each other. - In more concrete, the
orifice 136 includes astraight portion 136 b of thedischarge portion 134 side, and a slantenlarged portion 136 a of thecommunication path 150 side on which theball 162 of theball valve 160 is seated. In this instance, it is preferable that three or twelvegrooves 142 are formed on the slant enlargedportion 136 a at predetermined intervals to fluidically communicate thecommunication path 150 with thestraight portion 136 b even though theball 162 of theball valve 160 is seated on the slant enlargedportion 136 a. Therefore, even though theball 162 of theball valve 160 is seated on the slant enlargedportion 136 a, thecommunication path 150 can be fluidically communicated with thedischarge portion 134 through thegrooves 142 and thestraight portion 136 b. -
FIG. 5 shows an example that threegrooves 142 are formed, andFIG. 6 shows another example that sixgrooves 142 are formed, but it is preferable that sixgrooves 142 are formed in consideration of flow-ability and process-ability of refrigerant. Thegrooves 142 can be formed, for example, by a notching method. - Furthermore, it is preferable that a diameter of the
straight portion 136 b of the orifice is within the range of 2.6 mm to 3.1 mm and a diameter of theball 162 of theball valve 160 is within the range of 3.1 mm to 3.5 mm. - Additionally, it is preferable that a sectional area of the bleeding
channel 140, namely, a sectional area of the entire passageway of thegrooves 142 corresponds to a sectional area of a circle, which has a diameter of 0.3 mm to 0.8 mm. - Meanwhile, in this embodiment, the
grooves 142 of the bleedingchannel 140 are formed on the inner peripheral surface of the slant enlargedportion 136 a, but may be formed on the outer peripheral surface of theball 162, which is in contact with the slant enlargedportion 136 a as shown inFIG. 7 . InFIG. 7 , thegrooves 162 a are formed on the outer peripheral surface of theball 162 in a lattice form, but may be formed in one of various shapes. In addition, not shown in the drawings, but the bleedingchannel 140 may have a concave (not shown) formed on the outer peripheral surface of theball 162. - Moreover, the
ball 162 of theball valve 160 may be formed in a spherical or conical shape or one of other shapes. - Next, the operation of the expansion valve for the rear seat air conditioner of the automotive vehicle according to the present invention will be described.
- In case that the front and rear
seat air conditioners 10 and 30 (seeFIG. 1 ) constituting a dual air conditioner are all operated, when refrigerant is introduced from thereceiver dryer 16 into theentrance portion 132 of the high-pressure refrigerant channel 130, the opening degree of theorifice 136 is adjusted according to rise and fall of theball 162 of theball valve 160 due to the vertical movement of thepressure delivery bar 170. Therefore, refrigerant introduced into theentrance portion 132 can be supplied to therear evaporator 36 while controlling its flow rate after passing through thecommunication path 150, theorifice 136 and thedischarge portion 134 in order. - A structure for adjusting the opening degree of the
orifice 136 will be described in more detail. When temperature of refrigerant discharged from therear evaporator 36 to the low-pressure refrigerant channel 120 drops, temperature of refrigerant is transferred to thetemperature sensing bulb 180 through the pressure deliverbar 170. Therefore, temperature of thegas chamber 184 inside thetemperature sensing bulb 180 drops and gas contained inside thegas chamber 184 is condensed, so that pressure of thegas chamber 184 is lowered and volume of thegas chamber 184 is reduced, whereby thediaphragm 182 mounted inside thetemperature sensing bulb 180 is displaced upwardly. Thepressure delivery bar 170 is moved upwardly in link with the displacement of thediaphragm 182 and theball 162 of theball valve 160 is moved upwardly by elasticity of thespring 164, whereby the opening degree of theorifice 136 is reduced and the flow rate of refrigerant is reduced. Contrariwise, when temperature of refrigerant flowing inside the low-pressure refrigerant channel 120 rises, thepressure delivery bar 170 moves downwardly and the opening degree of theorifice 136 is increased, whereby the flow rate of refrigerant is increased. - As described above, after the front and rear
seat air conditioners seat air conditioner 10 is operated stopping the operation of the rearseat air conditioner 30 in case that there is no passenger on the rear seat of the automotive vehicle, generally, theorifice 136 is intercepted and refrigerant cannot be circulated between thecompressor 12 and the rearseat air conditioner 30 and is stagnated. Therefore, oil contained in refrigerant located in the stagnated area is not supplied to thecompressor 12. However, in the present invention, refrigerant of a predetermined flow rate can be circulated between thecompressor 12 and the rearseat air conditioner 30 through the bleedingchannel 140 having thegrooves 142 formed on the slant enlargedportion 136 a of theorifice 136. - That is, refrigerant of the
entrance portion 132 can be flown to thedischarge portion 134 after passing through thestraight portion 136 b of theorifice 136 through thecommunication path 150 and the bleedingchannel 140, whereby refrigerant of the predetermined flow rate can be circulated between the rearseat air conditioner 30 and thecompressor 12 smoothly. - As described above, when refrigerant of the predetermined flow rate can be circulated between the rear
seat air conditioner 30 and thecompressor 12, oil contained in refrigerant in the area can be supplied to thecompressor 12 smoothly so as to prevent a lack of lubrication of thecompressor 12. -
FIGS. 8 and 9 are graphs showing changes in an oil circulation rate by time when operation of the rear seat air conditioner to which the expansion valve of the present invention is applied is stopped.FIG. 8 shows a case that the diameter of the bleedingchannel 140 is 0.3 mm, andFIG. 9 shows a case that the diameter of the bleedingchannel 140 is 0.4 mm. As you can see fromFIGS. 8 and 9 , even though operation of the rearseat air conditioner 30 is stopped, oil is circulated through the bleedingchannel 140, so that oil can be supplied to thecompressor 12 smoothly and uniformly without reduction of the oil circulation rate as time goes. - The following Table 1 is to compare the oil circulation rate between the expansion valve according to the present invention and the prior art expansion valve to which the bleeding channel is not applied in case of a dual mode that the front and rear seat air conditioners are all operated and in case of a single mode that only the front seat air conditioner is operated stopping the operation of the rear seat air conditioner. For your reference, in Table 1, a dimension of the bleeding channel is indicated by converting a dimension corresponding to a sectional area of the entire passageway of the
grooves 142 into a diameter of a circle.TABLE 1 Bleeding Operation Oil circulation rate (%) Division channel (mm) period (HR) Dual Single Prior art None 1 8.0 3.4 2 2.2 4 1.8 Present 0.6 1 8.2 8.8 invention 12 8.9 Present 0.5 1 8.0 7.8 invention 22 7.9 Present 0.4 1 8.4 7.7 invention 32 7.7 Present 0.3 1 8.3 6.7 invention 42 6.7 - As indicated in the above Table 1, in the single mode, the oil circulation rate of the present invention was still higher than the prior art expansion valve, and did not drop even though time passed. In addition, not shown in Table 1, but even when refrigerant of the predetermined flow rate is circulated between the compressor and the rear seat air conditioner, cooling performance did not drop even though time passed.
- As described above, the expansion valve for the rear seat air conditioner of the automotive vehicle according to the present invention can circulate refrigerant between the compressor and the rear seat air conditioner since refrigerant of the predetermined flow rate introduced into the
entrance portion 132 from the receiver dryer can flow to thedischarge portion 134, which is connected to the rear evaporator, through the bleedingchannel 140 formed in the expansion valve even when operation of the rear seat air conditioner is stopped but only the front seat air conditioner is operated. Therefore, the present invention can smoothly supply oil contained in refrigerant between the compressor and the rear seat air conditioner to the compressor, thereby preventing bad influences on durability of the compressor, for example, sticking of the compressor due to a lack of lubrication as operation time of the compressor passes, and extending a lifespan of the compressor by protecting the compressor. In addition, the present invention can reduce operational noise of the compressor by raising a lubricating effect. - While the present invention has been described with reference to the particular illustrative embodiments, it is not to be restricted by the embodiments but only by the appended claims. It is to be appreciated that those skilled in the art can change or modify the embodiments without departing from the scope and spirit of the present invention.
Claims (6)
1. An expansion valve for a rear seat air conditioner of an automotive vehicle, which comprises: a low-pressure refrigerant channel for connecting an outlet of a rear evaporator with a compressor; a high-pressure refrigerant channel having an entrance portion for introducing refrigerant into the high-pressure refrigerant channel, a discharge portion connected to an inlet of the rear evaporator, and an orifice for connecting the entrance portion and the discharge portion with each other; a pressure delivery bar liftably mounted across the low-pressure refrigerant channel and the orifice of the high-pressure refrigerant channel; a temperature sensing bulb connected with the pressure delivery bar; and a ball valve mounted on a communication path fluidically communicating with the orifice and the entrance portion for adjusting an opening degree of the orifice in link with the pressure delivery bar,
wherein the orifice includes a slant enlarged portion formed on the communication path side so that a ball of the ball valve is seated on the slant enlarged portion, and
wherein the orifice has a bleeding channel formed on an inner circumferential surface thereof so as to fluidically communicate the communication path and the discharge portion with each other even when the ball of the ball valve is seated on the slant enlarged portion.
2. The expansion valve according to claim 1 , wherein the bleeding channel includes a groove formed on the slant enlarged portion.
3. The expansion valve according to claim 1 , wherein the bleeding channel includes a groove formed on the ball side, which is in contact with the slant enlarged portion.
4. The expansion valve according to claim 1 , wherein the orifice includes a straight portion formed on the discharge portion side, a diameter of the straight portion is within the range of 2.6 mm to 3.1 mm, and a diameter of the ball of the ball valve is within the range of 3.1 mm to 3.5 mm.
5. The expansion valve according to claim 2 , wherein the bleeding channel has three to twelve grooves.
6. The expansion valve according to claim 2 , wherein a sectional area of the entire passageway of the grooves is corresponded to a sectional area of a circle, which has a diameter ranging 0.3 mm to 0.8 mm.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020050102882A KR20070046323A (en) | 2005-10-31 | 2005-10-31 | Expansion valve for rear car air conditioner |
KR2005-102882 | 2005-10-31 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20070095098A1 true US20070095098A1 (en) | 2007-05-03 |
Family
ID=37913029
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/584,851 Abandoned US20070095098A1 (en) | 2005-10-31 | 2006-10-23 | Expansion valve for rear seat air conditioner |
Country Status (5)
Country | Link |
---|---|
US (1) | US20070095098A1 (en) |
JP (1) | JP2007126134A (en) |
KR (1) | KR20070046323A (en) |
CN (1) | CN100464097C (en) |
DE (1) | DE102006049852A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
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US20140096945A1 (en) * | 2012-10-09 | 2014-04-10 | Delphi Technologies, Inc. | Heating and cooling system for occupants of the rear portion of a vehicle |
US20160195318A1 (en) * | 2014-11-18 | 2016-07-07 | Valeo Japan Co., Ltd. | Expansion apparatus and refrigerant cycle of vehicle air conditioner using the same |
US20170115041A1 (en) * | 2015-10-27 | 2017-04-27 | Mahle International Gmbh | Valve mechanism for an air conditioning system |
US10414244B2 (en) | 2015-07-08 | 2019-09-17 | Denso Corporation | Refrigeration system, and in-vehicle refrigeration system |
US11225125B2 (en) * | 2017-07-31 | 2022-01-18 | Denso Corporation | Integrated valve device |
Families Citing this family (11)
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KR101275071B1 (en) * | 2007-05-08 | 2013-06-14 | 한라비스테온공조 주식회사 | Expansion valve of air conditioning system for automotive vehicles |
DE102008005074A1 (en) * | 2008-01-18 | 2009-07-23 | Valeo Klimasysteme Gmbh | Ejector for air conditioning |
JP2011133157A (en) * | 2009-12-24 | 2011-07-07 | Fuji Koki Corp | Expansion valve |
JP5432236B2 (en) * | 2011-01-31 | 2014-03-05 | 株式会社鷺宮製作所 | Throttle valve device |
JP6105256B2 (en) * | 2012-10-31 | 2017-03-29 | 株式会社日本クライメイトシステムズ | Air conditioner for vehicles |
US9682608B2 (en) * | 2013-01-30 | 2017-06-20 | Hanon Systems | Supplemental heating and cooling sources for a heating, ventilation and air conditioning system |
KR102552118B1 (en) * | 2016-07-22 | 2023-07-10 | 한온시스템 주식회사 | Air conditining system for vehicle and its control method |
KR102644744B1 (en) * | 2018-11-08 | 2024-03-11 | 주식회사 두원공조 | Cooling and heating system for vehicle |
KR102644747B1 (en) * | 2018-11-12 | 2024-03-11 | 주식회사 두원공조 | Cooling and heating system for vehicle |
JP7266283B2 (en) * | 2019-03-04 | 2023-04-28 | 株式会社不二工機 | valve device |
CN111219533B (en) * | 2020-03-23 | 2021-10-26 | 浙江农林大学暨阳学院 | Thermal expansion valve and automobile air conditioning system |
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- 2005-10-31 KR KR1020050102882A patent/KR20070046323A/en not_active Application Discontinuation
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- 2006-10-23 DE DE102006049852A patent/DE102006049852A1/en not_active Withdrawn
- 2006-10-23 US US11/584,851 patent/US20070095098A1/en not_active Abandoned
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- 2006-10-30 CN CNB2006101427156A patent/CN100464097C/en active Active
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US3768509A (en) * | 1971-06-14 | 1973-10-30 | G Goda | Liquid check valve assembly |
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Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
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US20140096945A1 (en) * | 2012-10-09 | 2014-04-10 | Delphi Technologies, Inc. | Heating and cooling system for occupants of the rear portion of a vehicle |
US9168810B2 (en) * | 2012-10-09 | 2015-10-27 | Delphi Technologies, Inc. | Heating and cooling system for occupants of the rear portion of a vehicle |
US20160195318A1 (en) * | 2014-11-18 | 2016-07-07 | Valeo Japan Co., Ltd. | Expansion apparatus and refrigerant cycle of vehicle air conditioner using the same |
US10414244B2 (en) | 2015-07-08 | 2019-09-17 | Denso Corporation | Refrigeration system, and in-vehicle refrigeration system |
US20170115041A1 (en) * | 2015-10-27 | 2017-04-27 | Mahle International Gmbh | Valve mechanism for an air conditioning system |
US10197315B2 (en) * | 2015-10-27 | 2019-02-05 | Mahle International Gmbh | Valve mechanism for an air conditioning system |
US11225125B2 (en) * | 2017-07-31 | 2022-01-18 | Denso Corporation | Integrated valve device |
Also Published As
Publication number | Publication date |
---|---|
KR20070046323A (en) | 2007-05-03 |
CN1959164A (en) | 2007-05-09 |
JP2007126134A (en) | 2007-05-24 |
DE102006049852A1 (en) | 2007-05-03 |
CN100464097C (en) | 2009-02-25 |
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