JP6002426B2 - Evaporator - Google Patents

Description

  The present invention relates to an evaporator suitably used for a car air conditioner that is a refrigeration cycle mounted on an automobile, for example.

In this specification and claims, the term “aluminum” includes aluminum alloys in addition to pure aluminum .

  Conventionally, refrigeration cycles used in car air conditioners include compressors, condensers, evaporators, expansion valves and gas-liquid separators as decompressors, and those equipped with capillary tubes as decompressors instead of expansion valves. Widely known.

The evaporator used in the above-described car air conditioner is connected to a plurality of refrigerant flow pipes through which the refrigerant flows, a refrigerant inlet header section and a refrigerant outlet header section to which the plurality of refrigerant distribution pipes are connected, and a refrigerant inlet header section. and aluminum inlet pipe for supplying a coolant into the inlet header, is connected to the refrigerant outlet header section includes an aluminum outlet pipe for discharging the refrigerant from the refrigerant outlet header section, during operation of a car air conditioner, the inlet pipe The refrigerant that has flowed into the refrigerant inlet header part through the refrigerant enters the refrigerant outlet header part through all the refrigerant flow pipes, and flows out through the outlet pipe. Such a car air conditioner detects, for example, the air temperature (discharge air temperature) on the outlet side of the evaporator, and is controlled so that the compressor is periodically turned on and off based on the detected air discharge temperature. The temperature is kept within a set temperature range.

  However, in the case of a car air conditioner in which an expansion valve is used as a pressure reducer, particularly when the car air conditioner is started, the refrigerant flow is disturbed by a sudden pressure change in the expansion valve, and the inlet pipe and the outlet pipe vibrate. There is a problem that the vibration propagates to the evaporator and vibrates the evaporator, thereby generating noise. In the case of a car air conditioner using a capillary tube as a decompressor, the capillary tube vibrates due to turbulence or pressure pulsation of the refrigerant flowing inside the capillary tube, and this vibration propagates to the evaporator via the inlet pipe. There is a problem that noise is generated.

  Especially in recent automobiles, engine noise, road noise, etc. are reduced and quietness is improved, so the noise emitted from the evaporator of a car air conditioner that is a refrigeration cycle causes discomfort to passengers in the passenger compartment It has become.

  As an evaporator having a noise reduction effect used in a car air conditioner provided with a capillary tube, a plurality of refrigerant flow pipes through which the refrigerant flows, a refrigerant inlet header section and a refrigerant outlet header section to which the plurality of refrigerant flow pipes are connected, and a refrigerant inlet An inlet pipe connected to the header portion for supplying the refrigerant into the refrigerant inlet header and an outlet pipe connected to the refrigerant outlet header portion for discharging the refrigerant from within the refrigerant outlet header portion; There has been proposed one in which a conduit having an inner diameter larger than the inner diameter of the inlet pipe is connected and the outer periphery of the conduit is covered with a damping material (see Patent Document 1).

  In the evaporator described in Patent Document 1, the refrigerant first flows into a conduit having an inner diameter larger than the inner diameter of the inlet pipe, releases the turbulent energy and pressure pulsation energy of the refrigerant flow into the conduit, and the pressure pulsation and the refrigerant flow. By damping the vibration of the conduit due to the turbulent energy with the damping material, the propagation of vibration to the inlet pipe and the evaporator is prevented, and the generation of noise from the evaporator is suppressed.

  However, the evaporator described in Patent Document 1 requires a conduit having an inner diameter larger than the inner diameter of the inlet pipe, which increases the number of parts. In addition, in order to effectively release the turbulent energy and pressure pulsation energy of the refrigerant flow into the conduit, it is necessary to make the length of the conduit constant or more, and there is a problem that the installation space of the evaporator is increased. Furthermore, the conduit is vibrated by the energy of pressure pulsation and refrigerant flow turbulence, and this vibration is damped by the damping material, so that the conduit vibration is transmitted to the inlet pipe before being damped by the damping material. The vibration transmitted to the pipe may be transmitted to the evaporator.

JP-A-6-194006

  An object of the present invention is to provide an evaporator that can solve the above-described problems and reduce the number of parts, prevent an increase in installation space, and is excellent in quietness.

  In order to achieve the above object, the present invention comprises the following aspects.

1) A plurality of refrigerant flow pipes through which refrigerant flows, a refrigerant inlet header section and a refrigerant outlet header section connected to the plurality of refrigerant distribution pipes, and aluminum that is connected to the refrigerant inlet header section and supplies the refrigerant into the refrigerant inlet header An inlet pipe, an aluminum outlet pipe connected to the refrigerant outlet header section for discharging the refrigerant from the refrigerant outlet header section , and attached to the inlet pipe and the distal end of the outlet pipe, and both pipes are connected to the expansion valve. An evaporator comprising a joint member ,
An evaporator in which a damping member made of a rubber-like elastic body is disposed inside an inlet pipe and an outlet pipe.

2) The evaporator according to 1) above, wherein the damping member is tubular and the outer circumferential surface of the damping member is in close contact with the inner circumferential surfaces of the inlet pipe and the outlet pipe.

3) At least one of the inlet pipe and the outlet pipe is bent between the connection end portion to the header portion and the tip portion, and the vibration damping member has a tip portion inside the bent pipe. The evaporator according to 1) or 2), wherein the evaporator is disposed so as to extend from the bent portion on the most distal end side to the portion beyond the bent portion.

4) The evaporator according to any one of 1) to 3) above, wherein the damping member is made of chloroprene rubber or ethylene propylene rubber.

According to the evaporators 1) to 4) , since the vibration damping member made of a rubber-like elastic body is arranged inside the aluminum inlet pipe and outlet pipe, the following effects can be obtained. That is, when this evaporator is used in a car air conditioner provided with an expansion valve as a pressure reducer, the expansion valve having a high-pressure refrigerant supply path and a low-pressure refrigerant discharge path over both ends of the inlet pipe and the outlet pipe ( A joint member connected to (not shown) is attached. Then, when the car air conditioner is started, the refrigerant flow is disturbed by a sudden pressure change in the expansion valve. This disturbance of the refrigerant flow is attenuated by the damping member, and the occurrence of vibrations in the inlet pipe and the outlet pipe is suppressed. . Therefore, vibration propagating from the inlet pipe and the outlet pipe to the evaporator is reduced, and generation of noise due to the vibration of the evaporator is suppressed. As a result, even in recent automobiles in which quietness is improved by reducing engine noise, road noise, and the like, noise generated from the evaporator is suppressed from causing discomfort to passengers in the passenger compartment.

  Moreover, unlike the evaporator described in Patent Document 1, a conduit having an inner diameter larger than the inner diameter of the inlet pipe and a length longer than a certain length is not required, so that the number of parts can be reduced and the installation space for the evaporator can be reduced. It becomes possible to reduce the size.

  According to the evaporator of 2), the disturbance of the refrigerant flow at the start of the car air conditioner is effectively attenuated by the damping member, and the occurrence of vibrations in the inlet pipe and the outlet pipe is further effectively suppressed.

  According to the evaporator of the above 3), even if the bending structure of the bent pipe is complicated, the damping member can be mounted relatively easily, and the disturbance of the refrigerant flow is effectively attenuated by the damping member. The

According to Ebapore data above 4), for example, is excellent in compatibility with the HFC134a used as a refrigerant,径時degradation is reduced, the vibration damping performance can be maintained over a long period of time.

FIG. 2 is a partially cutaway perspective view showing the overall configuration of the evaporator according to the present invention so that the damping member is outside the inlet pipe and the outlet pipe. It is an AA line expanded sectional view of Drawing 1 in the state where a damping member was attached inside an entrance pipe and an exit pipe.

Embodiments of the present invention will be described below with reference to the drawings. The embodiments described below, the evaporator according to the invention, is applied to a refrigeration cycle constituting the car air conditioner having the expansion valve as a decompressor.

Further , in the following description, the downstream side (direction indicated by arrow X in the drawing) of the air flowing through the ventilation gap between adjacent heat exchange tubes is referred to as the front, and the opposite side is referred to as the rear. Are left and right.

  FIG. 1 shows the overall configuration of an evaporator according to the present invention, and FIG. 2 shows the configuration of the main part thereof.

  In FIG. 1, the evaporator (1) is composed of an aluminum first header tank (2) and an aluminum second header tank (3) which are spaced apart in the vertical direction with the longitudinal direction directed in the horizontal direction. And a heat exchange core portion (4) provided between the header tanks (2) and (3).

  The first header tank (2) is integrated with the leeward upper header part (5) located on the front side (leeward side) and the rearward side (leeward side) and integrated with the leeward upper header part (5). The windward upper header part (6) is provided, the entire leeward upper header part (5) is a refrigerant inlet header part, and the whole windward upper header part (6) is a refrigerant outlet header part. . An aluminum inlet pipe (7) for supplying refrigerant into the leeward upper header (5) is connected to the right end of the leeward upper header (5) of the first header tank (2). An aluminum outlet pipe (8) for discharging the refrigerant from the upwind header section (6) is connected to the right end of the section (6). A joint member (9) connecting both pipes (7) and (8) to an expansion valve (not shown) having a high-pressure refrigerant supply path and a low-pressure refrigerant discharge path across the ends of the inlet pipe (7) and the outlet pipe (8). ) Is attached.

  The second header tank (3) includes a leeward lower header portion (11) located on the front side and an upwind lower header portion (12) located on the rear side and integrated with the leeward lower header portion (11). The entire leeward lower header portion (11) is a first intermediate header portion, and the entire leeward lower header portion (12) is a second intermediate header portion. The leeward lower header portion (11) and the leeward lower header portion (12) of the second header tank (3) are joined across the right end portions of the lower header portions (11) and (12), and The inside is communicated through a communication member (13) that forms a passage.

  The heat exchange core part (4) has a plurality of extruded aluminum flat refrigerant flow pipes (14) with the longitudinal direction facing the vertical direction and the width direction facing the ventilation direction (front-rear direction). Are arranged in parallel. That is, a plurality of sets of two refrigerant circulation pipes (14) arranged at intervals in the front-rear direction are arranged at intervals in the left-right direction, and the front and rear refrigerant circulation pipes (14) A ventilation gap is formed between adjacent members of the set. The upper end portion of the front refrigerant flow pipe (14) is connected to the leeward upper header portion (5), and the lower end portion thereof is connected to the leeward lower header portion (11). The upper end of the rear refrigerant flow pipe (14) is connected to the windward upper header (6), and the lower end is connected to the windward lower header (12). The front and rear refrigerant flow pipes (14) are spanned across the front and rear refrigerant flow pipes (14) on the outside of the air gap between adjacent sets of refrigerant flow pipes (14) and the left and right ends of the refrigerant flow pipes (14). Aluminum corrugated fins (15) are disposed on the refrigerant flow pipe (14) and aluminum side plates (16) are disposed on the outer sides of the corrugated fins (15) at both the left and right ends, respectively. ) Is brazed.

Tubular damping members (17) and (18) each made of a rubber-like elastic body are arranged inside the inlet pipe (7) and the outlet pipe (8). The outer peripheral surfaces of the damping members (17) and (18) are in close contact with the inner peripheral surfaces of the inlet pipe (7) and the outlet pipe (8). At least one of the inlet pipe (7) and the outlet pipe (8), here both pipes (7) and (8) are connected to the header portions (5) and (6), and the joint member (9 ) And the connection end to the expansion valve, and the connection portion of the joint member (9) to the expansion valve faces rearward. Here, the bent parts closest to the joint member (9) of the pipes (7) and (8) are indicated by (7a) and (8a). The damping members (17) and (18) are at least between the bent member (7a) and (8a) from the end on the joint member (9) side inside the pipes (7) and (8), preferably a joint member ( It is arranged so as to extend from the end portion on the 9) side to the portion beyond the bent portions (7a) and (8a). Vibration damping member (17) (18) consists of chloroprene rubber or ethylene propylene rubber.

  The evaporator (1) described above constitutes a refrigeration cycle together with a compressor, a condenser as a refrigerant cooler, and an expansion valve as a pressure reducer, and is mounted on a vehicle such as an automobile as a car air conditioner. During the operation of the compressor, the gas-liquid mixed phase two-phase refrigerant that has passed through the compressor, condenser, and expansion valve passes through the inlet pipe (7) and enters the leeward upper header section (5), and the front refrigerant refrigerant pipe (14 ) And flows into the leeward lower header section (11). The refrigerant that has entered the leeward lower header section (11) passes through the communication member (13), enters the leeward lower header section (12), and then passes through the rear refrigerant circulation pipe (14). It flows into the windward upper header section (6) and is sent to the compressor through the outlet pipe (8). The refrigerant exchanges heat with the air passing through the ventilation gap of the heat exchange core section (4) while the refrigerant flows in the refrigerant circulation pipe (14) in the front row and the refrigerant circulation pipe (14) in the rear row. It is cooled and the refrigerant flows out as a gas phase.

  If the compressor is turned on and off periodically for temperature control in the passenger compartment, the refrigerant flow is disturbed by a sudden pressure change at the expansion valve when the car air conditioner starts up. Is attenuated by the damping members (17) and (18), and the occurrence of vibration in the inlet pipe (7) and the outlet pipe (8) is suppressed. Therefore, the vibration propagating from the inlet pipe (7) and the outlet pipe (8) to the evaporator (1) is reduced, and the generation of noise due to the vibration of the evaporator (1) is suppressed. As a result, even in recent automobiles in which engine noise, road noise, and the like are reduced and quietness is improved, noise generated from the evaporator (1) is suppressed from causing discomfort to passengers in the passenger compartment.

  In the above embodiment, the entire leeward upper header portion of the first header tank serves as the refrigerant inlet header portion, and the entire leeward upper header portion serves as the refrigerant outlet header portion, and the leeward lower header of the second header tank. Although the whole part becomes the first intermediate header part and the whole windward lower header part becomes the second intermediate header part, it is not limited to this. For example, a plurality of compartments are provided in the longitudinal direction of the first header tank in the leeward upper header portion of the first header tank, and one of the compartments becomes the leeward upper header portion. In the section, a plurality of sections are provided side by side in the longitudinal direction of the first header tank, and one of the sections may be an upwind header section. In this case, a section at one end of the leeward upper header part is a refrigerant inlet header part, and a section at the same end as the refrigerant inlet header part in the windward upper header part is a refrigerant outlet header part.

  The evaporator according to the present invention is suitably used for an evaporator constituting a car air conditioner using an expansion valve as a decompressor.

(1): Evaporator
(5): Downward upper header (refrigerant inlet header)
(6): Upwind header (refrigerant outlet header)
(7): Inlet pipe
(7a): Bending part
(8): Outlet pipe
(8a): Bending part
(14): Refrigerant distribution pipe
(17) (18): Damping member

Claims (4)

A plurality of refrigerant flow pipes through which the refrigerant flows, a refrigerant inlet header section and a refrigerant outlet header section connected to the plurality of refrigerant distribution pipes, and an aluminum inlet connected to the refrigerant inlet header section for supplying the refrigerant into the refrigerant inlet header A pipe, an aluminum outlet pipe that is connected to the refrigerant outlet header portion and discharges the refrigerant from the refrigerant outlet header portion , and a joint member that is attached across the ends of the inlet pipe and the outlet pipe and connects both pipes to the expansion valve An evaporator comprising
An evaporator in which a damping member made of a rubber-like elastic body is disposed inside an inlet pipe and an outlet pipe. The evaporator according to claim 1, wherein the damping member is tubular and the outer peripheral surface of the damping member is in close contact with the inner peripheral surfaces of the inlet pipe and the outlet pipe. At least one of the inlet pipe and the outlet pipe is bent between the connection end portion to the header portion and the tip portion, and the vibration damping member extends from the tip portion inside the bent pipe. The evaporator according to claim 1, wherein the evaporator is disposed so as to reach a portion beyond the bent portion on the tip side. The evaporator according to any one of claims 1 to 3 , wherein the vibration damping member is made of chloroprene rubber or ethylene propylene rubber .

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