JP2018058482A - Air conditioner for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner for a vehicle capable of solving a problem caused by peeling of a packing that is pasted on a tank of a radiator.SOLUTION: A draft air duct formed in a housing 2 is provided with a pair of tanks 31, 32, a plurality of micro tubes 33 bridging between both tanks 31, 32, and a radiator 13 comprising a fin 34 provided among the micro tubes. Sealing packings 37, 38 pasted to cover each tank of the radiator 13 respectively are provided, and the packings 37, 38 are provided in such a manner as to cover a gap 36 between the tanks 31, 32 and the fin 34 on a windward side and not to cover it on a leeward side.SELECTED DRAWING: Figure 6

Description

  The present invention relates to an air conditioner for a vehicle provided with a micro tube type heat radiator in an air passage formed in a housing.

  A heat pump type vehicle air conditioner can be used for any engine-driven automobile, electric vehicle, or hybrid vehicle. A heat absorber (cooling heat exchanger) and a radiator are provided in an air passage formed in the housing. (Heating heat exchanger) is provided. In this case, the radiator is inserted and attached into the housing through an attachment / detachment opening formed in the housing (see, for example, Patent Document 1).

  In addition, the radiator is a micro tube type heat exchanger in consideration of heat exchange efficiency. FIGS. 8 and 9 show a view of this type of heat radiator 100 as viewed from the windward side and a cross-sectional view thereof, respectively. The radiator 100 was composed of a pair of tanks 101, 102, a plurality of microtubes 103 across the tanks 101, 102, and heat exchange fins 104 attached between the microtubes 103. .

  In this case, since a gap 106 is formed between the tanks 101 and 102 and the fins 104, the gap 106 is closed on the windward side and the leeward side, and the tanks 102 and 101, the housing 107, and the partition wall 108 ( For the purpose of sealing the space between the tanks 107 and 102, packings 111 and 112 are attached so as to cover them. Then, with the packings 111 and 112 attached, the radiator 100 is inserted into the housing 107 through the attachment / detachment port 113 from the side of the packing 111 that covers the upper tank 101.

  The attachment / detachment opening 113 is formed in the bottom wall 107A of the housing 107, and a flange 114 protruding outward is formed around the attachment / detachment opening 113. The flange 114 is inclined so as to narrow the opening at the tip (this is the opening of the attachment / detachment opening 113) in order to improve the sealing performance by bringing the packing 112 into close contact. The radiator 100 is inserted through the attachment / detachment port 113 and is disposed in the heating heat exchange passage 109 between the housing 107 and the partition wall 108.

JP, 2015-160461, A

  However, especially the portion of the packing 111 corresponding to the gap 106 between the fin 104 and the tank 101 has a small adhesion area, so that the portion on the leeward side is peeled off as shown by the broken line in FIG. (Indicated by 111A) blocks the leeward air passage (downstream of the heat exchange passage 109 for heating) of the radiator 100, obstructs the flow of air exchanged with the radiator 100, and improves the window clearness of the vehicle. The problem of getting worse occurred. Further, the packing 112 covering the lower tank 102 is pushed into the attachment / detachment port 113 at the final stage of insertion, but the attachment / detachment port 113 has a shape narrowed at the tip of the flange 114 as described above. At that time, the packing 112 may be caught on the opening edge and peeled off.

  The present invention has been made to solve the conventional technical problems, and provides a vehicle air conditioner that can solve the problem caused by the peeling of the packing stuck to the tank of the radiator. With the goal.

  In order to solve the above-mentioned problems, a vehicle air conditioner according to a first aspect of the present invention includes a pair of tanks, a plurality of microtubes extending between the two tanks, a microtube, and each microtube. It is provided with a heat sink composed of fins provided between them, and has a seal packing attached so as to cover each tank of the heat sink, and the packing has a gap between the tank and the fin on the windward side. The cover is provided so as not to be covered on the leeward side.

  A vehicle air conditioner according to a second aspect of the present invention includes a pair of tanks, a plurality of microtubes extending between the two tanks, and fins provided between the microtubes in an air passage formed in the housing. Comprising a seal packing affixed to cover each tank of the radiator and an attachment / detachment opening formed in the housing, and the radiator covers one of the tanks The packing that is inserted into the housing from the packing side through the attachment / detachment opening and covers the other tank is provided so as to cover the gap between the tank and the fin on the windward side and not on the leeward side.

  According to a third aspect of the present invention, there is provided a vehicle air conditioner comprising: a pair of tanks, a plurality of microtubes extending between the two tanks, and fins provided between the microtubes. A heatsink is provided with a seal packing affixed to cover each tank of the heatsink and an attachment / detachment opening formed in the housing, and the heatsink is on the packing side covering one tank The gasket is inserted into the housing through the attachment / detachment opening, and the packing covering each tank is provided so as to cover the gap between the tank and the fin on the windward side and not on the leeward side.

  A vehicle air conditioner according to a fourth aspect of the present invention is the air conditioning apparatus for a vehicle according to the second or third aspect, wherein the housing has a flange projecting outward from the periphery of the attachment / detachment opening, and the flange has an opening at the tip. It is inclined so as to narrow.

  According to the invention of claim 1 or claim 3, since the packing that covers the tank of the so-called microtube type radiator is provided so as to cover the gap between the tank and the fin on the windward side and not on the leeward side. There is no risk of the leeward packing being peeled off due to the change and blocking the air passage in the housing. Accordingly, it is possible to avoid inconvenience that the flow of air exchanged with the radiator is hindered and the window clearness of the vehicle is deteriorated.

  According to the invention of claim 2 or claim 3, when the radiator is inserted into the housing from the packing side that covers one of the tanks from the attachment / detachment port formed in the housing, each tank or the other tank is covered. Since the packing is provided so that the gap between the tank and the fin is covered on the windward side and not on the leeward side, it is difficult for the packing to be caught on the opening edge of the attachment / detachment port at the final stage of inserting the radiator from the attachment / detachment port.

  Thereby, it is possible to suppress the occurrence of inconvenience that the packing is peeled off when the radiator is inserted, and to improve the assembly workability. This is particularly effective when the housing has a flange projecting outward from the periphery of the attachment / detachment opening and the flange is inclined so as to narrow the opening at the tip. Become.

It is a schematic block diagram of the vehicle air conditioner of one Embodiment to which this invention is applied. It is sectional drawing of the air conditioning apparatus for vehicles of FIG. It is the schematic of the refrigerating cycle at the time of air_conditionaing | cooling operation of the air conditioning apparatus for vehicles of FIG. It is the schematic of the refrigerating cycle at the time of the heating operation of the air conditioning apparatus for vehicles of FIG. It is the figure seen from the windward side of the heat radiator of the vehicle air conditioner of FIG. It is sectional drawing of the heat radiator of FIG. It is the figure which looked at the heat radiator of FIG. 5 from the leeward side. It is the figure which looked at the conventional heat radiator from the windward side. It is sectional drawing of the heat radiator of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. A vehicle air conditioner 50 to which the present invention is applied is disposed in a vehicle interior of an automobile (including an engine-driven automobile, an electric vehicle, and a hybrid vehicle), and uses vehicle interior air (inside air) or exterior air (outside air). Heat exchange between the HVAC (Heating Ventilation and Air Conditioning) unit 1 (FIGS. 1 and 2) that takes in and regulates the temperature and blows it out into the passenger compartment, and exchanges heat between the HVAC unit 1 via the refrigerant. The refrigeration cycle (heat pump cycle) 20 (FIGS. 3 and 4) is performed.

  FIG. 1 is a schematic view of the HVAC unit 1, and FIG. 2 is a cross-sectional view of the HVAC unit 1. In the embodiment, the radiator 13 of the refrigeration cycle 20 is used as a heating device for heating, and the PTC heater 14 is used as an auxiliary heating device.

  First, the configuration of the HVAC unit 1 will be described with reference to FIGS. 1 and 2. The HVAC unit 1 includes a housing 2, and an air passage 3 is formed inside the housing 2. On the inlet side of the air passage 3, air flows from the internal air intake port 4 and the external air intake port 5, an internal / external air switching door 6 that selectively switches between the intake ports 4 and 5, a filter 7, and the intake ports 4 and 5. A blower 8 that takes in (inside air or outside air) and blows air to the air blowing path 3 is provided.

  A heat absorber 9 that is a heat exchanger for cooling the refrigeration cycle 20 is provided on the downstream side of the blower 8 in the air passage 3. The downstream side of the heat absorber 9 in the air passage 3 is divided into a heating heat exchange passage 11 and a bypass passage 12 by a partition wall 10 constituting a part of the housing 2. In the heat exchange passage 11 for heating, a radiator 13 which is a heat exchanger for heating of a refrigeration cycle as a heating device and a PTC heater 14 as an auxiliary heating device are provided in series. In this case, the PTC heater 14 is provided on the leeward side, and the radiator 13 is provided on the leeward side. Therefore, the bypass passage 12 bypasses the radiator 13 and the PTC heater 14.

  The PTC heater 14 is an auxiliary heating device particularly suitable for a hybrid vehicle and an electric vehicle, and heats the air by passing the air through the electrically heated heater element. Temperature control is facilitated by using a PTC heater as the electric heater. A heater core may be used as the auxiliary heating device. The heater core is an auxiliary heating device suitable for an engine-driven automobile, and heats air using engine cooling water (engine cooling water received by cooling the engine) as a heat medium.

  An air mix door 16 is provided on the inlet side of the heat exchange passage 11 for heating and the bypass passage 12. The air mix door 16 controls the flow of air to the heat exchange passage 11 for heating (PTC heater 14 and radiator 13), and blocks the flow of air to the heat exchange passage 11 for heating during cooling operation. It has a function to do.

  A def outlet 17, a face outlet 18, and a foot outlet 19 are provided on the outlet side of the air passage 3 in order to blow out temperature-controlled air in an appropriate direction, and these are opened and closed by respective doors. The

  In the case of a vehicle air conditioner with independent left and right temperature control specifications that can be adjusted independently on the driver's side and the passenger's side, the front side and the back side in the direction perpendicular to the plane of FIG. 1 and FIG. Left and right independent air passages 3 and 3 are formed on the side. The heat absorber 9, the radiator 13, and the PTC heater 14 are provided across the left and right independent air passages 3 and 3. The air mix door 16 is separately provided in the left and right independent air passages 3 and 3, and the left and right independent temperature adjustment is possible by adjusting the opening degree of each air mix door 16 separately. At this time, it goes without saying that the face outlet 18 and the foot outlet 19 are provided independently on the left and right.

  Next, the configuration of the refrigeration cycle 20 will be described with reference to FIGS. 3 and 4. 3 and 4 are schematic views of the refrigeration cycle 20, FIG. 3 shows a state during cooling operation, and FIG. 4 shows a state during heating operation.

  The refrigeration cycle 20 circulates the refrigerant, and includes the heat absorber (cooling heat exchanger) 9 and the radiator (heating heat exchanger) 13. The refrigeration cycle 20 includes the heat absorber (cooling heat exchanger) 9, a compressor (compressor) 21 to which the outlet side pipe of the heat absorber 9 is connected, and a radiator (to which the outlet side pipe of the compressor 21 is connected). A heat exchanger for heating) 13, a decompression device 22 such as an expansion valve to which an outlet side pipe of the radiator 13 is connected, an outside heat exchanger 23 to which an outlet side pipe of the decompression device 22 is connected, and the outside of the cabin The decompression device 24 such as an expansion valve to which the outlet side piping of the heat exchanger 23 is connected is configured, and the outlet side piping of the decompression device 24 is connected to the heat absorber 9.

  The vehicle exterior heat exchanger 23 is disposed outside the vehicle interior, specifically, in front of the vehicle, and exchanges heat with the outside air by receiving air blown by the fan 29 or traveling wind of the vehicle. A bypass pipe 25 is provided for the decompression device 22. Here, under the control of the on-off valve 26 provided in the bypass pipe 25, the refrigerant flows through the bypass pipe 25 during the cooling operation, and the refrigerant flows through the decompression device 22 during the heating operation.

  Further, a bypass pipe 27 for bypassing the pressure reducing device 24 and the heat absorber (cooling heat exchanger) 9 is provided. Here, under the control of the on-off valve 28 provided in the bypass pipe 27, the refrigerant flows to the decompression means 24 and the heat absorber 9 during the cooling operation, and the refrigerant flows through the bypass pipe 27 during the heating operation. In addition to the on-off valves 26 and 28, a one-way valve or the like is provided as appropriate for the above flow control, but it is omitted here.

  Next, the operation of the refrigeration cycle 20 will be described separately for the cooling operation and the heating operation. During the cooling operation, as shown in FIG. 3, the on-off valve 26 of the bypass pipe 25 is opened, the on-off valve 28 of the bypass pipe 27 is closed, and the refrigerant is circulated as shown by the arrows in FIG. In the refrigeration cycle 20, first, the high-temperature and high-pressure gas refrigerant compressed by the compressor 21 flows into the radiator (heating heat exchanger) 13. However, during the cooling operation, the air mix door 16 is closed to exchange heat with air. Is not performed, and passes through the radiator 13 as it is. Accordingly, the high-temperature and high-pressure gas refrigerant compressed by the compressor 21 passes through the bypass pipe 25 as it is and flows into the vehicle exterior heat exchanger 23 that functions as a radiator during cooling operation. Therefore, the high-temperature and high-pressure gas refrigerant radiates heat to the outside air in the vehicle exterior heat exchanger 23 and is condensed and liquefied. Note that, compared with a method in which the refrigerant bypasses the radiator (heating heat exchanger) 13 during cooling operation, piping and valves for bypassing can be omitted, and cost reduction can be achieved.

  The refrigerant condensed in the vehicle exterior heat exchanger 23 is adiabatically expanded by a decompression device 24 such as an expansion valve, and after being decompressed, becomes a gas-liquid two-phase refrigerant to become a heat absorber (cooling heat exchanger) 9. Flow into. The refrigerant that has flowed into the heat absorber 9 is heated by heat exchange with air to be evaporated into gas. At this time, the air cooled by the heat absorber 9 is blown out from an appropriate blow-out port, and is provided for cooling in the passenger compartment. The refrigerant that has passed through the heat absorber 9 is sucked into the compressor 21 and compressed again.

  During heating operation, as shown in FIG. 4, the on-off valve 26 of the bypass pipe 25 is closed, the on-off valve 28 of the bypass pipe 27 is opened, and the refrigerant is circulated as shown by the arrows in FIG. In the refrigeration cycle 20, first, the high-temperature and high-pressure gas refrigerant compressed by the compressor 21 flows into the radiator (heating heat exchanger) 13, and is cooled and condensed into liquid by heat exchange with air. At this time, the air blown out from the blower 8 is heated by the radiator 13, blown out from an appropriate outlet, and is used for heating the passenger compartment.

  The refrigerant condensed in the radiator 13 is adiabatically expanded by a decompression device 22 such as an expansion valve, and after being decompressed, becomes a gas-liquid two-phase refrigerant and functions as a heat absorber during heating operation. 23. This gas-liquid two-phase refrigerant absorbs heat from the outside air by the air blown by the fan 29 or the traveling wind of the vehicle in the vehicle exterior heat exchanger 23 and is evaporated and then sucked into the compressor 21 through the bypass pipe 27. And compressed again.

  In the vehicle air conditioner 50 using the refrigeration cycle 20 as described above, since the radiator 13 is used as a heating device during heating operation, the heating performance may be inferior at extremely low temperatures. For this reason, the PTC heater 14 is used together as an auxiliary heating device.

  Next, the structure of the radiator 13 and the assembly structure / procedure thereof will be described with reference to FIGS. 2 and 5 to 7. In this case, the radiator 13 is configured by a microtube type heat exchanger having high heat exchange efficiency between air and the refrigerant. 5 is a view of the radiator 13 as viewed from the leeward side, FIG. 6 is a sectional view, and FIG. 7 is a view as viewed from the leeward side. The radiator 13 includes a pair of upper and lower tanks 31, 32, a plurality of microtubes 33 extending between the tanks 31, 32, and heat exchange fins 34 attached between the microtubes 33. Yes.

  5 and 7, the microtube 33 and the fin 34 are not shown separately, but actually, a plurality of microtubes 33 are arranged in parallel between the tanks 31 and 32, and the fins are interposed between the microtubes 33. 34 are attached respectively.

  Further, in this case, gaps 36 and 36 are formed between the upper tank 31 and the fin 34 positioned at the upper end, and between the lower tank 32 and the fin 34 positioned at the lower end, respectively. Since there are no fins 34 in the gap 36, the heat exchange efficiency between the air and the refrigerant is significantly reduced. Therefore, for the purpose of closing the gaps 36 and sealing between the tanks 32, 31 and the housing 2 and the partition wall 10 (which also constitutes part of the housing 2), Soft packings 37 and 38 are pasted so as to cover.

  In this case, the packing 37 covers the outer surface of the tank 31 from above, and covers the gap 36 between the tank 31 and the fin 34 at the upper end with the windward side of the air blown from the floor 8 and does not cover with the leeward side. Is provided. Further, the packing 38 is provided so as to cover the outer surface of the tank 32 from below, and similarly cover the gap 36 between the tank 32 and the fin 34 at the lower end on the upwind side but not on the downwind side. As a method of not covering the leeward side, the leeward side portions of the packings 111 and 112 in FIG. 9 described above (the portion indicated by 111A in FIG. 9 with respect to the packing 111) are cut out, or FIG. This is achieved by sticking a thing with a width smaller than that of the sticker.

  On the other hand, an attachment / detachment port 41 is formed in the bottom wall 2 </ b> A of the housing 2. A flange 42 that protrudes downward (outward) is formed around the attachment / detachment opening 41, and this flange 42 closes the packing 38 and improves the sealing performance as will be described later. Is inclined so as to narrow the opening).

  Then, the radiator 13 with the packings 37 and 38 attached thereto as described above is inserted into the housing 2 from the side of the packing 37 covering the upper tank 31 through the attachment / detachment port 41, and the partition wall 10 and the housing 2 are inserted. It arrange | positions in the heat exchange path 11 for heating between 2A of bottom walls.

  In this state, the upper packing 37 is in close contact with the partition wall 10 to seal between the radiator 13 and the partition wall 10 and closes the gap 36 between the tank 31 and the fin 34 at the upper end on the windward side. It is also possible to prevent air from passing through the gap 36. Further, the lower packing 38 is in close contact with the flange 42 around the attachment / detachment port 41 to seal between the radiator 13 and the bottom wall 2A, close the attachment / detachment port 41, and between the tank 32 and the fin 34 at the lower end. Since the gap 36 is closed on the windward side, the passage of air through the gap 36 is also prevented.

  Further, since the upper packing 37 is provided so as not to cover the gap 36 on the leeward side, the packing 37 on the leeward side due to aging does not peel off. Therefore, the packing that has been peeled off as in the past does not block the air passage 3 on the downstream side of the heating heat exchange passage 11 in the housing 2, and the flow of air exchanged with the radiator 13 is prevented from being hindered. Therefore, the inconvenience that the window clearness of the vehicle deteriorates can be avoided in advance.

  Further, in the final stage when the radiator 13 is inserted from the attachment / detachment opening 41, the lower packing 38 is pressed while being crushed, but the packing 38 is on the leeward side and the gap between the tank 32 and the fin 34 at the lower end. 36 so that the heat dissipator 13 is pushed in while pressing the windward side portion of the packing 38 against the inner surface of the flange 42, so that the leeward side portion of the packing 38 can be relatively easily removed from the flange 42. Can be placed inside. That is, the packing 38 does not get caught on the opening edge of the attachment / detachment opening 41 as in the prior art.

  As a result, it is possible to suppress the occurrence of inconvenience that the packing 38 is peeled off when the radiator 13 is inserted, and to improve the assembly workability. This is particularly effective when a flange 42 protruding outward from the periphery of the attachment / detachment opening 41 is provided as in the embodiment, and the flange 42 is inclined so as to narrow the opening at the tip.

  In the embodiment, the upper and lower packings 37 and 38 do not cover the gap 36 on the leeward side. However, in the invention of claim 1, only the upper packing 37 may be provided. Only the packing 38 may be used.

  Further, the configuration of the refrigeration cycle and the structure of the HVAC shown in the embodiments are not limited thereto, and it goes without saying that various modifications can be made without departing from the seed showcase of the present invention.

DESCRIPTION OF SYMBOLS 1 HVAC unit 2 Housing 3 Air supply path 4 Inside air intake port 5 Outside air intake port 6 Inside / outside air switching door 8 Blower 9 Heat absorber 10 Partition wall 11 Heat exchange passage for heating 12 Bypass passage 13 Radiator 14 PTC heater 16 Air mix door 17 Differential Air outlet 18 Face air outlet 19 Foot air outlet 20 Refrigeration cycle 31, 32 Tank 33 Micro tube 34 Fin 36 Gap 37, 38 Packing 41 Detachment port 42 Flange 50 Air conditioner for vehicle

Claims (4)

In a vehicle air conditioner including a pair of tanks, a plurality of microtubes extending between both tanks, and a heat radiator including fins provided between the microtubes, in a ventilation path formed in the housing.
It has a seal packing affixed to cover each tank of the radiator,
The vehicle air conditioner is characterized in that the packing is provided so as to cover a gap between the tank and the fin on the windward side but not on the leeward side. In a vehicle air conditioner including a pair of tanks, a plurality of microtubes extending between both tanks, and a heat radiator including fins provided between the microtubes, in a ventilation path formed in the housing.
A seal packing affixed to cover each tank of the radiator,
An attachment / detachment opening formed in the housing,
The radiator is inserted into the housing from the detachable opening from the packing side that covers one of the tanks,
The packing for covering the other tank is provided so as to cover the gap between the tank and the fin on the windward side and not on the leeward side. In a vehicle air conditioner including a pair of tanks, a plurality of microtubes extending between both tanks, and a heat radiator including fins provided between the microtubes, in a ventilation path formed in the housing.
A seal packing affixed to cover each tank of the radiator,
An attachment / detachment opening formed in the housing;
The radiator is inserted into the housing from the detachable opening from the packing side that covers one of the tanks,
The packing for covering each tank is provided so as to cover a gap between the tank and the fin on the windward side and not on the leeward side.   The said housing has a flange which protrudes outward from the circumference | surroundings of the said attachment / detachment opening, This flange is inclined so that opening of a front-end | tip may be narrowed, The Claim 2 or Claim 3 characterized by the above-mentioned. Air conditioner for vehicles.

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