JP2015189257A - Vehicular air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the transmission of vibrations accompanied with coolant passing, while suppressing the increase of weight, in a vehicular air conditioner 1.SOLUTION: A vehicular air conditioner 1 is equipped with an expansion valve 52; an air conditioning case 11; a heat exchanger 20 for cooling disposed in the air conditioning case 11; a coolant pipe 90 connecting a coolant outlet of the expansion valve 52 and a coolant inlet of the heat exchanger 20 for cooling; and a packing 100 formed by an elastic member, and disposed between the coolant pipe 90 and the air conditioning case 11 in the air conditioning case 11. The packing 100 suppresses the transmission of vibrations from the coolant pipe 90 to the air conditioning case side, while pressed by a plurality of ribs 110 of the air conditioning case 11 and elastically deformed between the air conditioning case 11 and the coolant pipe 90.

Description

  The present invention relates to a vehicle air conditioner.

  2. Description of the Related Art Conventionally, an expansion valve for an air conditioner includes a rubber body that stores an expansion mechanism and a housing member that stores the rubber body, and the expansion mechanism is supported on the housing member via the rubber body to expand the expansion mechanism. The refrigerant passing sound due to the vibration of the valve body constituting the valve is reduced (for example, see Patent Document 1).

  Furthermore, some air conditioners use a hose member made of an elastic material as the refrigerant pipe in order to reduce the refrigerant passing sound generated when the refrigerant passes through the refrigerant pipe between the expansion valve and the heat exchanger for cooling. (For example, refer to Patent Document 2).

Japanese Patent Laid-Open No. 9-144543 JP 2004-42811 A

  The present inventors refer to the inventions described in Patent Documents 1 and 2 above, and in the vehicle air conditioner, the refrigerant passing sound caused by vibration generated when the refrigerant flows from the expansion valve to the cooling heat exchanger. Studied to prevent the passengers from feeling uncomfortable.

  According to the present inventors, the refrigerant flows as a turbulent flow in a gas-liquid two-phase state in the refrigerant pipe between the refrigerant outlet of the expansion valve and the refrigerant inlet of the cooling heat exchanger. For this reason, when the refrigerant passes through the refrigerant pipe, the liquid phase refrigerant collides with the inner wall of the refrigerant pipe, or a vortex of the refrigerant is generated in the refrigerant pipe, thereby causing vibration. This vibration resonates in the tank on the refrigerant inlet side of the cooling heat exchanger. As a result, the refrigerant passing sound due to the vibration is amplified in the tank on the refrigerant inlet side. This amplified sound is transmitted to the passenger compartment through the air conditioning case, giving the passenger a sense of incongruity.

  For example, by wrapping an elastic member such as butyl rubber around the cooling heat exchanger main body or refrigerant piping associated with the cooling heat exchanger to increase the weight of the cooling heat exchanger, thereby reducing vibrations associated with passage of the refrigerant. However, there is a tradeoff that increases the weight of the heat exchanger for cooling.

  In view of the above points, the present invention provides a vehicle air conditioner that suppresses an increase in the weight of a cooling heat exchanger and suppresses the sound of refrigerant passing due to the vibration of the refrigerant piping from causing the passenger to feel uncomfortable. An object is to provide an apparatus.

  In order to achieve the above object, according to the first aspect of the present invention, there is provided an expansion valve (52) for constituting the refrigeration cycle device (54) to depressurize the refrigerant, and an air flow path for circulating an air flow toward the vehicle interior. An air-conditioning case (11) constituting the refrigeration cycle apparatus together with the expansion valve, and a cooling heat exchanger (20) for cooling the air flow with the refrigerant decompressed by the expansion valve, are disposed in the air-conditioning case. The refrigerant pipe (90) for guiding the refrigerant flowing from the refrigerant outlet of the expansion valve to the refrigerant inlet of the cooling heat exchanger, and a packing formed by an elastic member and disposed between the air conditioning case and the refrigerant pipe (100), and the air conditioning case is provided with a protrusion (110) that protrudes toward the refrigerant pipe, and the air conditioning case presses the refrigerant pipe through the packing by the protrusion to push the packing. Characterized in that it is deformed.

  Therefore, it is possible to reduce the vibration generated in the refrigerant pipe as the refrigerant passes. For this reason, while suppressing an increase in the weight of the heat exchanger for cooling, vibration propagation from the refrigerant pipe to the heat exchanger for cooling is also suppressed, reducing the noise passing through the refrigerant radiated from the heat exchanger for cooling. Giving a sense of incongruity can be suppressed.

  In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim shows the correspondence with the specific means as described in embodiment mentioned later.

It is a side view of the vehicle air conditioner in one embodiment of the present invention. It is a figure which shows the refrigerating cycle which the heat exchanger for cooling of the said embodiment and an expansion valve comprise. It is the figure which looked at the heat exchanger for cooling of the above-mentioned embodiment from the vehicle rear side. It is a figure which shows schematic structure of the heat exchanger for cooling of the said embodiment. It is the elements on larger scale of the heat exchanger for cooling of the said embodiment. It is a graph which shows the actual measurement value of the vibration characteristic of the upper end tank of the heat exchanger for cooling. It is a graph which shows the characteristic of a refrigerant passing sound in the vehicle air conditioner which is not elastically deforming the packing of FIG. It is a graph which shows the characteristic of a refrigerant passing sound in the vehicle air conditioner of the said embodiment.

  Hereinafter, an embodiment of a vehicle air conditioner of the present invention will be described with reference to the drawings.

  1 and 3, each arrow indicates a vehicle mounted state, a front arrow indicates a vehicle traveling direction front side, a rear arrow indicates a vehicle traveling direction rear side, an up arrow indicates a celestial region improvement side, and a down arrow indicates a top and bottom direction downward direction. The right arrow indicates the right side in the vehicle width direction (vehicle left-right direction), and the left arrow indicates the left side in the vehicle width direction.

  As shown in FIG. 1, the vehicle air conditioner 1 includes an indoor air conditioning unit 10 and a blower unit (not shown). The indoor air-conditioning unit 10 is disposed on the center side in the lower part of the instrument panel (instrument panel) in the vehicle interior. The blower unit is arranged offset to the passenger seat side with respect to the indoor air conditioning unit 10.

  The indoor air-conditioning unit 10 includes an air-conditioning case 11 that constitutes an air flow path that circulates air blown from the blower unit toward the vehicle interior. In the air conditioning case 11, a cooling heat exchanger 20, a heating heat exchanger 30, and an auxiliary heater 40 are arranged.

  As shown in FIG. 2, the cooling heat exchanger 20 constitutes a refrigeration cycle device 54 that circulates refrigerant together with a compressor 50, a condenser 51, an expansion valve 52, and an accumulator 53. The compressor 50, the condenser 51, the expansion valve 52, the cooling heat exchanger 20, and the accumulator 53 are connected by a refrigerant pipe.

  As shown in FIGS. 3 and 4, the cooling heat exchanger 20 includes a plurality of tubes 60, heat exchange fins 61, upper tanks 70, 71, 72, 73, and lower tanks 74, 75.

  The plurality of tubes 60 are arranged in two rows in the air flow direction in the air conditioning case 11 (see arrow A in FIG. 4). Among the plurality of tubes 60, the plurality of tubes 60 on the downstream side in the air flow direction together with the heat exchange fins 61 constitute the heat exchange cores 80 and 81. The heat exchange core 80 is disposed on the one side in the arrangement direction of the tubes 60 with respect to the heat exchange core 81. The heat exchange fins 61 are connected to the surface of the plurality of tubes 60. Among the plurality of tubes 60, the plurality of tubes 60 on the upstream side in the air flow direction together with the heat exchange fins 61 constitute the heat exchange cores 82 and 83. The heat exchange core 82 is arranged on the one side in the arrangement direction of the tubes 60 with respect to the heat exchange core 83.

  In the present embodiment, the refrigerant that has flowed out of the expansion valve 52 in the cooling heat exchanger 20 flows as indicated by an arrow B.

  Specifically, the upper tank 70 divides the refrigerant that has flowed out of the expansion valve 52 into a plurality of tubes 60 that constitute the heat exchange core 80. The lower tank 74 collects the refrigerant flowing out from the plurality of tubes 60 constituting the heat exchange core 80 and divides the refrigerant into the plurality of tubes 60 constituting the heat exchange core 81. The upper tank 71 collects refrigerant flowing out from the plurality of tubes 60 constituting the heat exchange core 81, and flows the collected refrigerant to the upper tank 72. The upper tank 72 is divided into a plurality of tubes 60 constituting the heat exchange core 82. The lower tank 75 collects refrigerant flowing out from the plurality of tubes 60 constituting the heat exchange core 82 and divides the refrigerant into the plurality of tubes 60 constituting the heat exchange core 83. The upper tank 73 collects the refrigerant flowing from the plurality of tubes 60 constituting the heat exchange core 83 and guides it to the accumulator 53.

  The heating heat exchanger 30 in FIG. 3 is disposed on the air downstream side with respect to the cooling heat exchanger 20, and heats the air that has passed through the cooling heat exchanger 20 with engine cooling water (hot water). The auxiliary heater 40 is composed of an electric heater such as a PTC element or the like, and is disposed on the air downstream side of the heat exchanger 30 for heating. The auxiliary heater 40 heats the air flow that has passed through the heat exchanger 30 for heating. The cooling heat exchanger 20, the heating heat exchanger 30, and the auxiliary heater 40 are supported by the air conditioning case 11.

  The air conditioning case 11 of FIG. 1 is provided with bypass passages 35a and 35b that allow the cool air flowing from the cooling heat exchanger 20 to bypass the heating heat exchanger 30 and the auxiliary heater 40 and flow to each outlet opening. The bypass passage 35 a is provided above the heating heat exchanger 30 in the air conditioning case 11. The bypass passage 35 b is provided in the air conditioning case 11 below the heating heat exchanger 30.

  Here, each blowing opening part is comprised from the face blowing opening part, the foot blowing opening part, and the defroster blowing opening part. The face blowout opening is a blowout opening that guides the conditioned air to a face blowout port that blows the conditioned air toward the passenger's upper body. The foot blowout opening is a blowout opening that guides the conditioned air to a foot blowout that blows the conditioned air toward the passenger's lower body. The defroster blowout opening is a blowout opening that guides the conditioned air to the defroster blowout that blows the conditioned air onto the inner surface of the window glass.

  Between the heat exchanger 30 for heating and the heat exchanger 20 for cooling, air mix doors 37a and 37b are provided. The air mix door 37a changes the ratio of the amount of air passing through the bypass passage 35a and the amount of air passing through the heating heat exchanger 30 and the auxiliary heater 40. The air mix door 37b changes the ratio between the amount of air passing through the bypass passage 35b and the amount of air passing through the heating heat exchanger 30 and the auxiliary heater 40. With the air mix doors 37a and 37b operating in this way, the temperature of the air blown out from the air outlet into the vehicle compartment can be changed.

  The refrigerant inlet of the upper tank 70 of the cooling heat exchanger 20 of the present embodiment is connected to the refrigerant outlet of the expansion valve 52 via the refrigerant pipe 90. The expansion valve 52 is disposed in the air conditioning case 11. The refrigerant pipe 90 connects between the upper tank 70 of the cooling heat exchanger 20 and the expansion valve 52. The refrigerant pipe 90 guides the refrigerant decompressed and expanded by the expansion valve 52 to the upper tank 70 of the cooling heat exchanger 20.

  In the air conditioning case 11, a packing 100 formed in a plate shape by an elastic member such as rubber is disposed between the refrigerant pipe 90 and the inner wall of the air conditioning case 11. The packing 100 is disposed on the right side in the vehicle width direction with respect to the refrigerant pipe 90. The packing 100 of the present embodiment is located on the refrigerant tank 90 on the upper tank 70 side of the cooling heat exchanger 20.

  Here, a plurality of ribs 110 (four ribs 110 in FIG. 5) are provided on the inner wall of the air conditioning case 11 as protrusions protruding toward the refrigerant pipe 90 side. The plurality of ribs 110 are arranged in the flow direction of the refrigerant in the refrigerant pipe 90. Each of the plurality of ribs 110 is formed to extend in a direction orthogonal to the flow direction of the refrigerant in the refrigerant pipe 90.

  The plurality of ribs 110 of the air conditioning case 11 respectively hold the packing 100 toward the refrigerant pipe 90. For this reason, the packing 100 is held by the plurality of ribs 110, and in the refrigerant pipe 90, the upper tank 70 side of the cooling heat exchanger 20 (that is, the refrigerant inlet side of the cooling heat exchanger 20) and the air conditioning case 11. It is elastically deformed between. In the present embodiment, the plurality of ribs 110 are pressed against the packing 100 in a direction orthogonal to the flow direction of the refrigerant in the refrigerant pipe 90.

  Next, the operation of the vehicle air conditioner 1 of the present embodiment will be described. First, the compressor 50 sucks and compresses the refrigerant and discharges it. The condenser 51 cools and condenses the refrigerant discharged from the compressor 50. The expansion valve 52 decompresses and expands the refrigerant cooled and condensed by the condenser 51. The cooling heat exchanger 20 cools the air flow in the air conditioning case 11 with the refrigerant decompressed and expanded by the expansion valve 52. The accumulator 53 stores liquid refrigerant among the refrigerant flowing out of the cooling heat exchanger 20 and guides the gas refrigerant to the inlet of the compressor 50.

  Here, in the refrigerant pipe 90 between the expansion valve 52 and the cooling heat exchanger 20, the refrigerant discharged from the expansion valve 52 flows into the cooling heat exchanger 20 in a gas-liquid two-phase state. At this time, the refrigerant discharged from the expansion valve 52 flows to the upper tank 70 side of the cooling heat exchanger 20 as turbulent flow. For this reason, in the refrigerant pipe 90, the liquid-phase refrigerant out of the refrigerant collides with the inner wall of the refrigerant pipe 90, or the refrigerant vortex is generated. Accordingly, vibration occurs when the refrigerant passes through the refrigerant pipe 90.

  On the other hand, in the air conditioning case 11 of the present embodiment, the packing 100 is elastically deformed between the air conditioning case 11 and the refrigerant pipe 90 by pressing the packing 100 toward the refrigerant pipe 90 by the plurality of ribs 110. Thereby, vibration generated in the refrigerant pipe 90 can be reduced.

  According to the present embodiment described above, the expansion valve 52 that configures the refrigeration cycle device 54 and decompresses the refrigerant, the air conditioning case 11 that configures the air flow path that distributes the air flow toward the vehicle interior, and the air conditioning case The cooling heat exchanger 20 that cools the air flow with the refrigerant that is disposed in the refrigerant 11 and depressurized by the expansion valve 52 and the refrigerant that flows from the refrigerant outlet of the expansion valve 52 are guided to the refrigerant inlet of the cooling heat exchanger 20. The refrigerant pipe 90 and a packing 100 formed by an elastic member and disposed between the refrigerant pipe 90 and the air conditioning case 11 inside the air conditioning case 11. The rib 110 is pressed and elastically deformed between the air conditioning case 11 and the refrigerant pipe 90. In other words, the air conditioning case 11 is characterized in that the packing 100 is elastically deformed by pressing the refrigerant pipe 90 through the packing 100 with a plurality of ribs 110.

  Therefore, vibration generated in the refrigerant pipe 90 as the refrigerant passes through the refrigerant pipe 90 can be reduced. For this reason, vibration propagation from the refrigerant pipe 90 to the cooling heat exchanger 20 is also suppressed. Therefore, resonance of the upper tank 70 of the cooling heat exchanger 20 due to vibration of the refrigerant pipe 90 is suppressed. Along with this, it is possible to reduce the refrigerant passing sound radiated from the cooling heat exchanger 20 and to prevent the passenger from feeling uncomfortable. As described above, it is possible to suppress an increase in the weight of the cooling heat exchanger 20 and to prevent the passenger from feeling uncomfortable due to the refrigerant passing sound caused by the vibration accompanying the refrigerant passing.

  In particular, in the present embodiment, the air conditioning case 11 presses the packing 100 by a plurality of ribs 110 and elastically deforms the packing 100 between the air conditioning case 11 and the refrigerant pipe 90. For this reason, the several rib 110 can concentrate the force added to the packing 100 side from the air-conditioning case 11 side. Therefore, regardless of the shape of the refrigerant pipe 90, the packing 100 can be reliably pressed against the refrigerant pipe 90 side, and vibration generated in the refrigerant pipe 90 can be reduced.

  The effect of the packing 100 of this embodiment is demonstrated with reference to FIG.6, FIG.7, FIG.8.

FIG. 6 is a graph showing measured values of the vibration characteristics of the upper tank 70 of the cooling heat exchanger 20. This graph shows vibration frequency characteristics indicating the relationship between vibration (m / S ² ) and frequency (Hz) acquired by installing the sensor S (see FIG. 3) for detecting vibration of the upper tank 70 in the upper tank 70. is there. FIG. 7 is a graph showing the characteristics of refrigerant passing sound when the packing is not elastically deformed. FIG. 8 is a graph showing characteristics of refrigerant passing sound when the packing 100 of the present embodiment is used. 7 and 8 are actual measurement values of the refrigerant passing sound acquired by the microphone in the vicinity of the face outlet.

  When the vibration characteristic of the upper tank 70 in FIG. 6 is compared with the characteristic of the refrigerant passing sound in FIG. 7, the peak is obtained at the same frequency (2.2 kHz, 4.8 kHz). For this reason, it can be seen that the refrigerant passing sound is caused by the vibration of the upper tank 70.

  On the other hand, when the packing 100 of this embodiment is used, the sound pressure level of the refrigerant passing sound is lowered by the packing 100 as can be seen from the characteristics of the refrigerant passing sound of the refrigerant pipe 90 of FIGS. I understand that. In FIG. 8, the peak at 2.2 kHz and the peak at 4.8 kHz are lowered.

(Other embodiments)
In the above-described embodiment, the example in which the plurality of ribs 110 press the packing 100 in a direction orthogonal to the refrigerant flow direction in the refrigerant pipe 90 has been described. The pressing direction may be a direction other than the orthogonal direction to the refrigerant flow direction.

  In addition, this invention is not limited to above-described embodiment, In the range described in the claim, it can change suitably.

DESCRIPTION OF SYMBOLS 1 Vehicle air conditioner 10 Indoor air conditioning unit 11 Air conditioning case 20 Cooling heat exchanger 52 Expansion valve 54 Refrigeration cycle apparatus 60 Tube 61 Heat exchange fin 70 Upper tank (inlet tank)
90 Refrigerant piping 110 Rib (protrusion)
100 packing

Claims (3)

An expansion valve (52) that constitutes the refrigeration cycle device (54) and depressurizes the refrigerant;
An air-conditioning case (11) that constitutes an air flow path for circulating an air flow toward the vehicle interior;
A cooling heat exchanger (20) that constitutes the refrigeration cycle apparatus together with the expansion valve and cools the air flow with the refrigerant decompressed by the expansion valve;
A refrigerant pipe (90) disposed in the air conditioning case for guiding the refrigerant flowing from the refrigerant outlet of the expansion valve to the refrigerant inlet of the cooling heat exchanger;
A packing (100) formed by an elastic member and disposed between the air conditioning case and the refrigerant pipe;
The air conditioning case is provided with a protruding portion (110) protruding toward the refrigerant pipe side,
The vehicle air conditioner is characterized in that the air conditioning case elastically deforms the packing by pressing the refrigerant pipe through the packing by the protrusion.   The said packing is hold | suppressed by the said projection part, and is elastically deforming between the refrigerant | coolant inlet side of the said heat exchanger for cooling and the said air-conditioning case among the said refrigerant | coolant piping. Vehicle air conditioner. The cooling heat exchanger includes a plurality of tubes (60) through which the refrigerant flows and exchanges heat between the refrigerant and the air, and refrigerant that has passed through the refrigerant pipe from the expansion valve side. An inlet tank (70) for diverting to the tube,
2. The vehicle air conditioner according to claim 1, wherein the packing is pressed by the protrusion and is elastically deformed between the inlet tank side of the refrigerant pipe and the air conditioning case.

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