JP2002029251A - Air conditioner for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner for a vehicle capable of improving the assembly property and enabling reuse by mounting an expansion valve so as to wrap it by an easily detachable thermal insulation member. SOLUTION: In this air conditioner for the vehicle provided with an air conditioning case 4 introducing air into a vehicle room, an evaporator 5 stored in the air conditioning case 4 to cool air, the expansion valve 13 connected with the evaporator 5 and arranged on an outer side of one end face of the air conditioning case 4 to reduce a pressure of high pressure refrigerant, and refrigerant outlet and inlet pipes 14a, 14b connected with one end face of the expansion valve 13, the expansion valve 13 has a half split shape so as to wrap a part of the expansion valve 13 and the refrigerant outlet and inlet pipes 14a, 14b, and a thermal insulation case 15 in which a recessed part for fitting an outer shape of the part of the expansion valve 13 and the refrigerant outlet and inlet pipes 14a, 14b is formed is mounted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner for a vehicle for air-conditioning a vehicle interior, and more particularly, to soundproofing and heat insulation of a pressure reducing means provided outside an air conditioning case.

[0002]

2. Description of the Related Art A decompression means (expansion valve) connected to a cooling means (evaporator) of a conventional vehicle air conditioner for decompressing and expanding a high-pressure refrigerant is provided, for example, as shown in FIG. 100, an evaporator 110 is accommodated therein.
An expansion valve 120 connected to the air conditioning case 100 is disposed outside one end surface of the air conditioning case 100. The expansion valve 120 includes
A refrigerant inlet / outlet pipe 130 is connected to the opposite surface side connected to the evaporator 110.

[0003] The above-mentioned expansion valve 120 is connected to the evaporator 11.
This is a temperature-type expansion valve that detects an outlet temperature of 0 and feeds it back to the control mechanism of the expansion valve 120. Generally, this temperature-type expansion valve has a large opening degree of the expansion valve 120 when a cooling operation is started while the vehicle is left for a while under a condition in which the outside air temperature or the inside air temperature is relatively high. Therefore, when a large amount of liquid refrigerant is sent to the evaporator 110, the refrigerant may pass through the expansion valve 120 instantaneously.

When the expansion valve 120 is exposed as shown in FIG. 4A, the evaporator 1 is cooled in a cooling operation.
Since the connection is made to the connection 10, there is a possibility that dew condensation water is generated and drops of water are dropped into the vehicle interior.

Therefore, in order to prevent these, FIG.
As shown in (b), the expansion valve 120 and the inlet / outlet pipe 1
A heat insulating member 14 of a plate-like rectangular sheet made of rubber (for example, butyl rubber) so as to cover the entire surface of the connection portion 30
The end surface of the heat insulating member 140 is pressed down with a fingertip so as to prevent air from entering and exiting the inside of the heat insulating member 140, thereby bonding the heat insulating member 140 to the inside. With the heat insulating member 140, the former is soundproofed and the latter is prevented from dew condensation.

[0006]

However, when the above-mentioned heat insulating member 140 is used, there is a problem that an assembling time for securely winding and bonding is required.

When the heat insulating member 140 comes into contact with an adjusting nut for adjusting the opening of the expansion valve 120 for inspection of a refrigeration cycle or the like, it is necessary to remove the adhesive so as to peel off the adhesive portion. However, this heat insulating member 140
If it is removed so as to be peeled off and re-attached after inspection, the adhesive surface deteriorates and it is difficult to reuse it. As a result, at the time of maintenance or inspection such as replacement or adjustment of the expansion valve 120, it is necessary to replace the expansion valve 120 with a new substitute at every maintenance and inspection.

In view of the above, an object of the present invention is to provide
It is an object of the present invention to provide an air conditioner for a vehicle, which is easily attached and detached so as to include an expansion valve so as to be easily assembled and reused.

[0009]

In order to achieve the above object, the technical means according to claims 1 to 3 are adopted.

That is, according to the first aspect of the present invention, the blowing means (3) for generating an air flow, the air conditioning case (4) for guiding the air from the blowing means (3) into the vehicle interior, and the air conditioning case (4).
A cooling means (5) for dehumidifying and cooling the air from the blowing means (3), and a high-pressure refrigerant connected to the cooling means (5) and installed outside one end face of the air conditioning case (4). In a vehicle air conditioner provided with a pressure reducing means (13) for reducing pressure and a refrigerant pipe (14a, 14b) connected to one end face of the pressure reducing means (13), the pressure reducing means (13) includes a pressure reducing means (13). ) And a part of the refrigerant pipes (14a, 14b), have a half-split shape, and have a concave portion for fitting with the external shape of a part of the pressure reducing means (13) and the refrigerant pipes (14a, 14b). Characterized in that a heat insulating member (15) in which is formed is mounted.

According to the first aspect of the present invention, the pressure reducing means (1
3) By mounting a heat insulating member (15) fitted to the external shape of a part of the refrigerant pipes (14a, 14b), the enclosing portion becomes a heat insulating member (15) as in the conventional technology of winding a rubber-like rectangular sheet. No condensation water is generated around the decompression means (13) which is cooled by being closely contacted with and covered.

Further, for example, the heat insulating member (15) has a half-split shape, and the pressure reducing means (13) and the refrigerant pipe (14a, 1
By mounting so that a part of 4b) is fitted, assembling of the heat insulating member (15) is facilitated, and the number of assembling steps can be reduced as compared with the conventional method of winding a rubber-like rectangular sheet.

Further, a heat-insulating member (15) having a half-split shape is provided.
For example, by making attachment and detachment easy such that one end is engaged with the convex portion and the other end is engaged with the concave portion, it can be reused as compared with the conventional bonding method, and the serviceability can be improved.

According to the second aspect of the present invention, the heat insulating member (15)
Means that an outer case (15a) whose outside is formed of a resin or rubber-based material, and a heat insulating portion (15b) having a sound absorbing and water repellent function inside the outer case (15a). Features.

According to the invention of claim 2, since the refrigerant passage noise generated from the pressure reducing means (13) at the time of startup of the air conditioner is a source of relatively high frequency range above 4KH _Z, for example, the outer casing (15a ), A heat insulating portion (15b) having a sound absorbing function is provided inside the heat insulating portion (15b).
The sound is absorbed by b) and soundproofing becomes possible.

Also, a heat insulating portion (15b) having a water repellent function.
With this configuration, the heat insulating portion (15b) maintains the heat insulating characteristics and the sound absorbing characteristics without impregnating the dew water.

According to the third aspect of the present invention, the heat insulating member (15)
Has a protrusion (16a) at one end and a protrusion (1) at the other end.
6a) and a recess (16b) for engaging with
The depressurizing means (13) and the refrigerant pipes (14a, 14b) are engaged by engaging the convex part (16a) and the concave part (16b).
Is characterized by including a part of

According to the third aspect of the present invention, the heat insulating member (1)
5) By adopting an easily detachable structure in which one end is engaged with the convex portion (16a) and the other end is engaged with the concave portion (16b), it can be reused as compared with the conventional bonding method, and the serviceability is improved. Improvement can be achieved. In addition, the code | symbol in parenthesis of each said means shows the correspondence with the concrete means of embodiment mentioned later.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a vehicle air conditioner according to the present invention will be described below with reference to FIGS. First,
The air-conditioning unit 1 includes an inside / outside air switching unit 2 for selecting whether the air to be sent into the vehicle compartment is the inside air (inside air) or the outside air (outside air), and the air selected by the inside / outside air switching unit 2. A blowing means 3 for blowing air into the vehicle interior, an air conditioning case 4 as an air passage for guiding air from the blowing means 3 into the vehicle interior,
The air conditioner includes an evaporator 5 as cooling means for cooling air flowing through the air conditioning case 4 and a temperature adjusting means 6 for adjusting the temperature of air blown out from the air conditioning case 4 into the vehicle interior.

The inside / outside air switching means 2 is provided at a position upstream of the air of the blowing means 3 and has an inside air suction port 2a communicating with the vehicle interior.
And an outside air suction port 2b communicating with the outside of the vehicle, and an inside / outside air switching door 2c for selectively opening and closing the inside air suction port 2a and the outside air suction port 2b. The inside / outside air switching door 2c is driven by a driving means such as a servo motor (not shown), and inside air circulation mode in which the inside air is sucked through the inside air suction port 2a, and outside air is sucked through the outside air suction port 2b. Switches to the outside air introduction mode.

The air blowing means 3 is connected to the air upstream side of the air conditioning case 4 and is a means for generating an air flow for blowing air into the vehicle interior. The blower 3 includes a fan case 3a, a fan 3b, and a fan motor 3c.
Drives the fan 3b according to the voltage applied from the drive circuit, and blows the inside air or the outside air into the vehicle compartment through the air conditioning case 4.

The air-conditioning case 4 is arranged in the front of the vehicle interior. At the outlet side of the air-conditioning case 4, a face outlet 7 for blowing out the air passing through the air-conditioning case 4 toward the upper body of the occupant in the passenger compartment, and a foot outlet 8 for blowing out the air toward the feet of the occupant. And a defroster outlet 9 for blowing the air toward the window glass of the automobile.

The air conditioning case 4 is provided with means for adjusting the amount of air flowing through each of the air outlets 7, 8, and 9, specifically, a face door 7a, a foot door 8a, and a defroster door 9a. These doors 7a, 8a,
9a is driven by respective driving means, specifically, a servomotor (not shown).

Next, the temperature adjusting means 6 includes a heater core 6a.
And an air mix door 6b. In the heater core 6a, a hot air passage 6c through which air from the evaporator 5 passes through the heater core 6a and a bypass passage 6d through which air from the evaporator 5 bypasses the heater core 6a are formed at the downstream side of the evaporator 5. It is arranged to be. The heater core 6a is a heat exchanger through which engine cooling water flows, and heats the air in the air conditioning case 4 passing through the heater core 6a by the heat of the engine cooling water.

The air mix door 6b is provided at a position upstream of the heater core 6a on the air side, and is driven by driving means such as a servomotor. In accordance with the position set by the servomotor, the amount of air that passes through the warm air passage 6c and is heated by the heater core 6a and the amount of air that passes through the bypass passage 6d are adjusted to blow out from the outlet. The temperature of the blowout temperature is adjusted.

Next, the evaporator 5 is a component of a refrigeration cycle for cooling the air passing through the air-conditioning case 4, and is disposed upstream of the air inside the air-conditioning case 4. Cool the air. The refrigerating cycle is a well-known type that includes a compressor 10, a condenser 11, a liquid receiver 12, and an expansion valve 13 in addition to the evaporator 5.

The compressor 10 is driven to rotate by transmitting the rotational power of an engine (not shown) via an electromagnetic clutch (not shown), and operates the refrigerating cycle to make the evaporator 5 function as cooling means. .

Next, one end of the expansion valve 13 is connected to the inlet pipe 5a and the outlet pipe 5b of the evaporator 5, and the other end of the expansion valve 13 communicates with the refrigerant inlet pipe 14a and the compressor 10 which communicate with the liquid receiver 12. This is a box-type expansion valve connected to the refrigerant outlet pipe 14b. The expansion valve 13 includes an evaporator 5
Contains a temperature sensing part that detects the refrigerant temperature at the outlet side of
It depressurizes and expands the high-temperature and high-pressure liquid refrigerant that has passed through the receiver 12, detects the outlet temperature of the evaporator 5 so as to maintain an appropriate degree of superheat at the outlet of the evaporator 5, and adjusts the refrigerant flow rate. is there.

As shown in FIG. 2A, the expansion valve 13 is provided outside the one end face of the air conditioning case 4 and is enclosed by a heat insulating case 15. The two-dot chain line shown in FIG. 2A is a heat insulating material covered by the refrigerant inlet / outlet pipes 14a and 14b.

As shown in FIG. 2B, the heat-insulating case 15 is formed in a half-split shape and includes an outer case 15a and a heat-insulating portion 15b. As shown in FIG. 2 (b), the half-split shape has one end of the heat-insulating case 15 divided into two parts elastically connected, and the other end of the heat-insulating case 15 can be opened and closed. (Separable).

The outer case 15a is made of a resin such as polypropylene or a rubber-based material.
Is formed of a heat insulating material having a sound absorbing effect such as a foam material having an air layer and having a water repellent function, and one of the expansion valve 13 and the refrigerant inlet / outlet pipes 14a and 14b inside the outer case 15a. It is formed in a concave shape for fitting with the external shape of the part.

By forming the heat insulating portion 15b in a concave shape, the expansion valve 13 and the refrigerant inlet / outlet pipes 14a, 1a
A part of 4b is closely contacted and contained without gaps, thereby preventing contact with high-humidity air in the vehicle interior, thereby preventing the generation of dew condensation water. In addition, by using a heat insulating material having a water repellent function, the heat insulating property and the sound absorbing property are maintained without impregnating the heat insulating part 15b with dew water.

Also, a protrusion 16a is formed at one end, and a recess 16b is formed at the other end to engage with the protrusion 16a. The outer case 15a is attached by bending along the longitudinal center line of the outer case 15a. There is an easy structure. Thereby, the expansion valve 13 and the refrigerant inlet / outlet pipes 14a, 14b
Is included.

The operation of the vehicle air conditioner having the above configuration will be described. First, the air conditioning control is controlled by an electric control circuit (not shown). The air-conditioning control circuit is constituted by, for example, a microcomputer, and inputs signals such as an inside air temperature detected by an inside air temperature sensor, an outside air temperature detected by an outside air temperature sensor, an amount of solar radiation detected by a solar radiation sensor, and a set temperature set by an occupant. For example, information on an operation panel (not shown) operated by the occupant is read, and a target blowing temperature is calculated based on the data, and a blowing mode, an opening degree of the air mix door 6b, a voltage level of the blowing means 3 are calculated. , For controlling the operation / stop of the compressor 10.

An occupant operates an operation panel (not shown).
When the operation switch is operated, the air-conditioning operation is started, and the target blowing temperature is calculated based on the selected set temperature, the blowing mode, the opening degree of the air mix door 6b, the voltage level of the blowing means 3, This is for adjusting the air conditioning temperature in the vehicle cabin to a set temperature while controlling the operation / stop of the compressor 10 and the like.

According to the vehicle air conditioner in the above embodiment, when the air conditioner is operated to operate the compressor 10 and the evaporator 5 is cooled, the expansion valve 1 connected to the evaporator 5 is cooled.
Since 3 is cooled by heat transfer, the heat insulation case 15 can be included to prevent the generation of dew condensation water.

When the compressor 10 is started up while the vehicle is left for a while under a high load environment condition where the outside air temperature and the inside air temperature are relatively high, the degree of opening of the expansion valve 13 becomes large. Therefore, when a large amount of liquid refrigerant is sent to the evaporator 5, the liquid refrigerant is generated from the expansion valve 13 instantaneously. However, the refrigerant passing noise is also possible to soundproof by inclusion in adiabatic case 15 an expansion valve 13 for a source of relatively high frequency range of not lower than 4KH _Z.

Further, by forming the heat insulating case 15 in a half-split shape and mounting the expansion valve 13 and a part of the refrigerant inlet / outlet pipes 14a and 14b so as to fit each other, the heat insulating case 15 is formed.
Is easier to assemble, and assembling is simpler than in the conventional method of winding a rubber-like rectangular sheet, so that the number of assembling steps can be reduced.

Further, since the heat-insulating case 15 can be easily attached and detached so that one end of the heat-insulating case 15 is engaged with the convex portion and the other end is engaged with the concave portion, the heat-insulating case 15 can be reused as compared with the conventional bonding method, thereby improving serviceability. .

(Other Embodiments) In the above embodiment, the heat insulating case 15 has been described as a one-piece product having a half-split shape. However, the present invention is not limited to this, and as shown in FIG.
The d may be divided into two parts. As a result, the outer case 15a can be made unnecessary, so that the cost can be reduced. In addition, the projections 16a and the depressions 16b are additionally engaged by division.

In the above embodiment, the box-shaped expansion valve 13 having a built-in temperature sensing part has been described. However, the present invention can be applied to a temperature type expansion valve having an external temperature sensing part.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing a schematic configuration of a vehicle air conditioner according to an embodiment of the present invention.

FIG. 2A is a perspective sectional view showing a mounted state of a heat insulating case according to an embodiment of the present invention, and FIG. 2B is a perspective view showing a configuration of the heat insulating case.

FIG. 3 is a perspective view illustrating a configuration of a heat insulating case according to another embodiment.

FIG. 4A is a perspective cross-sectional view showing a mounted state of an expansion valve according to the related art, and FIG. 4B is a perspective cross-sectional view showing a mounted state where a heat insulating member is wound around the expansion valve according to the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 3 ... Blowing means 4 ... Air conditioning case 5 ... Evaporator (cooling means) 13 ... Expansion valve (decompression means) 14a ... Refrigerant inlet pipe (refrigerant pipe) 14b ... Refrigerant outlet pipe (refrigerant pipe) 15 ... Heat insulating case (heat insulating member) 15a: outer case 15b: heat insulating portion 16a: convex portion 16b: concave portion

Claims (3)

[Claims] An air supply means for generating an air flow; an air conditioning case for guiding air from the air supply means into a vehicle compartment; and an air conditioning case accommodated in the air conditioning case. A cooling means (5) for dehumidifying and cooling the air from the air blowing means (3); and a depressurization connected to the cooling means (5) and installed outside one end of the air conditioning case (4) for decompressing the high-pressure refrigerant. Means (13), and a refrigerant pipe (14a, 14b) connected to one end face of the pressure reducing means (13), wherein the pressure reducing means (13) includes the pressure reducing means (13). ) And a part of the refrigerant pipe (14a, 14b), and has a half-split shape, and is fitted with the external shape of the decompression means (13) and a part of the refrigerant pipe (14a, 14b). Recess is formed for Vehicle air conditioner, wherein the heat member (15) is mounted. 2. The heat insulating member (15) has an outer case (15) whose outside is formed of a material such as resin or rubber.
2. The vehicle air conditioner according to claim 1, further comprising: a) and a heat insulating portion having a sound absorbing and water repelling function inside the outer case. 3. The heat insulating member (15) has a convex portion (16a) at one end, a concave portion (16b) engaging with the convex portion (16a) at the other end, and the convex portion. (16a) is engaged with the recess (16b) to reduce the pressure (13) and the refrigerant pipe (14a, 14b).
The vehicle air conditioner according to claim 2, wherein a part of the air conditioner is included.