JP2012167879A - Evaporator and vehicle air conditioning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an evaporator and a vehicle air conditioning device, capable of suppressing amplification of noise generating when a refrigerant passes through an expansion valve.SOLUTION: This evaporator configures the vehicle air conditioning device with a compressor, a condenser and the expansion valve 5. The evaporator includes an evaporator body having a refrigerant inlet header section, a refrigerant outlet header section and a heat exchange core section, a refrigerant inlet pipe 3 connected with the refrigerant inlet header section at one end to allow the refrigerant to flow into the refrigerant inlet header section, and a refrigerant outlet pipe connected with the refrigerant outlet header section at one end to allow the refrigerant to flow out from the refrigerant outlet header section. The other end of the refrigerant inlet pipe 3 is connected with the expansion valve 5 to be communicated with a refrigerant supply pathway 32, and the other end of the refrigerant outlet pipe is connected with the expansion valve 5 to be communicated with a refrigerant discharge pathway. The relationship of B/A≤1.0 is satisfied, when an inner diameter of the refrigerant supply pathway 32 of the expansion valve 5 is A mm, and an inner diameter of the refrigerant inlet pipe 3 is B mm.

Description

  The present invention relates to an evaporator and a vehicle air conditioner including the evaporator.

  As an evaporator used in a vehicle air conditioner mounted on an automobile, an evaporator main body having a refrigerant inlet header, a refrigerant outlet header, and a heat exchange core, and one end connected to the refrigerant inlet header of the evaporator main body and a refrigerant A refrigerant inlet pipe that allows a refrigerant to flow into the inlet header part and a refrigerant outlet pipe that has one end connected to the refrigerant outlet header part of the evaporator body and allows the refrigerant to flow out of the refrigerant outlet header part are known ( Patent Document 1).

  The evaporator described in Patent Document 1 includes a compressor, a refrigerant cooler that cools the refrigerant compressed by the compressor, a refrigerant supply path and a refrigerant discharge path, and an expansion that depressurizes the refrigerant cooled by the refrigerant cooler. The vehicle air conditioner is configured together with the valve, and is not explicitly disclosed in Patent Document 1, but is connected to the expansion valve so that the other end of the refrigerant inlet pipe communicates with the refrigerant supply path. The other end is connected to the expansion valve so as to communicate with the refrigerant discharge path.

  By the way, in the case of the vehicle air conditioner using the evaporator described in Patent Document 1, an abnormal noise is generated when the refrigerant passes through the expansion valve, which is significantly amplified by the refrigerant inlet pipe of the evaporator, etc. May give a pleasant feeling.

JP 2005-164226 A

  An object of the present invention is to provide an evaporator and a vehicle air conditioner that can solve the above-described problems and can suppress amplification of abnormal noise generated when the refrigerant passes through the expansion valve.

  As a result of repeated experiments and researches to solve the above problems, the present inventors have found that in the evaporator described in Patent Document 1, the inner diameter of the refrigerant inlet pipe is considerably larger than the inner diameter of the refrigerant supply path of the expansion valve. In addition, when the refrigerant flows from the refrigerant supply passage of the expansion valve into the refrigerant inlet pipe, the volume of the refrigerant changes so as to increase, and due to this volume change, the difference generated when the refrigerant passes through the expansion valve. We found that the sound was significantly amplified.

  The present invention has been completed based on such knowledge and comprises the following aspects.

1) A vehicle air conditioner together with a compressor, a refrigerant cooler that cools the refrigerant compressed by the compressor, and an expansion valve that has a refrigerant supply path and a refrigerant discharge path and depressurizes the refrigerant cooled by the refrigerant cooler An evaporator body having a refrigerant inlet header section, a refrigerant outlet header section and a heat exchange core section, one end of which is connected to the refrigerant inlet header section of the evaporator body and the refrigerant flows into the refrigerant inlet header section And a refrigerant outlet pipe having one end connected to the refrigerant outlet header of the evaporator body and allowing the refrigerant to flow out of the refrigerant outlet header, and the other end of the refrigerant inlet pipe communicates with the refrigerant supply path. In an evaporator that is connected to the expansion valve in a state, and the other end of the refrigerant outlet pipe is connected to the expansion valve in a state of communication with the refrigerant discharge path.
An evaporator that satisfies the relationship B / A ≦ 1.0, where Amm is the inner diameter of the refrigerant supply path of the expansion valve and Bmm is the inner diameter of the refrigerant inlet pipe.

2) a compressor, a refrigerant cooler that cools the refrigerant compressed by the compressor, an expansion valve that depressurizes the refrigerant cooled by the refrigerant cooler, and an air conditioner for a vehicle including the evaporator described in 1) above. ,
A vehicle air conditioner that satisfies the relationship B / A ≦ 1.0, where the inner diameter of the refrigerant supply path of the expansion valve is A mm and the inner diameter of the refrigerant inlet pipe is B mm.

  According to the evaporator of 1), when the inner diameter of the refrigerant supply passage of the expansion valve is Amm and the inner diameter of the refrigerant inlet pipe is Bmm, the relationship of B / A ≦ 1.0 is satisfied. When the refrigerant is incorporated in an air conditioner for a vehicle, a volume change that increases the volume of the refrigerant when the refrigerant flows into the refrigerant inlet pipe from the refrigerant supply path of the expansion valve can be suppressed. Therefore, amplification of abnormal noise generated when the refrigerant passes through the expansion valve is suppressed, and discomfort is prevented from being given to the passengers in the passenger compartment.

  According to the vehicle air conditioner of 2) above, when the inner diameter of the refrigerant supply path of the expansion valve is Amm and the inner diameter of the refrigerant inlet pipe is Bmm, the relationship B / A ≦ 1.0 is satisfied. However, when the refrigerant flows into the refrigerant inlet pipe from the refrigerant supply path of the expansion valve, a volume change that increases the volume of the refrigerant can be suppressed. Therefore, amplification of abnormal noise generated when the refrigerant passes through the expansion valve is suppressed, and discomfort is prevented from being given to the passengers in the passenger compartment.

It is a partially cutaway perspective view showing an evaporator and an expansion valve of the present invention used in a vehicle air conditioner. It is an AA line expanded sectional view of FIG. It is a graph which shows the experimental result performed using this invention product and a comparative product. It is a figure equivalent to FIG. 2 which shows the modification of a refrigerant inlet pipe and an expansion valve attachment member.

  Embodiments of the present invention will be described below with reference to the drawings.

  In the following description, the downstream side in the ventilation direction (the direction indicated by the arrow X in FIG. 1) is the front, and the opposite side is the rear. Further, the left and right when viewing the rear from the front, that is, the left and right in FIG.

  Furthermore, in the following description, the term “aluminum” includes aluminum alloys in addition to pure aluminum.

  FIG. 1 shows an evaporator and an expansion valve of the present invention used for a vehicle air conditioner, and FIG.

  In FIG. 1, an evaporator (1) includes an evaporator body (2), a refrigerant inlet pipe (3), and a refrigerant outlet pipe (4). As is well known, a compressor (not shown), a compressor A condenser (including a subcool condenser having a supercooling section in addition to the condenser section) (not shown) as a refrigerant cooler that cools the refrigerant compressed in (5), and an expansion valve that depressurizes the refrigerant cooled by the condenser (5 ) Together with the vehicle air conditioner, and evaporates the refrigerant decompressed by the expansion valve (5).

  The evaporator body (2) includes an aluminum first header tank (11) and an aluminum second header tank (12) extending in the left-right direction and spaced apart in the vertical direction, and both header tanks (11) (12 ) And a heat exchange core portion (13) provided between them. The first header tank (11) is integrated with the refrigerant inlet header portion (14) located on the front side (downstream side in the ventilation direction) and the refrigerant inlet header portion (14) located on the rear side (upstream side in the ventilation direction). And a refrigerant outlet header portion (15). A refrigerant inlet (16) is provided at the right end of the refrigerant inlet header (14), and one end of an aluminum refrigerant inlet pipe (3) is inserted into the refrigerant inlet (16) to form the refrigerant inlet header (14 )It is connected to the. Also, a refrigerant outlet (17) is provided at the right end of the refrigerant outlet header (15), and one end of an aluminum refrigerant outlet pipe (4) is inserted into the refrigerant outlet (17) so that the refrigerant outlet header Connected to (15). Then, the refrigerant flows from the refrigerant inlet pipe (3) through the refrigerant inlet (16) into the refrigerant inlet header part (14) and from the refrigerant outlet header part (15) through the refrigerant outlet (17) to the refrigerant outlet pipe. (4) is leaked.

  The second header tank (12) includes a first intermediate header portion (18) located on the front side and a second intermediate header portion (19) located on the rear side and integrated with the first intermediate header portion (18). And. The first intermediate header portion (18) and the second intermediate header portion (19) of the second header tank (12) are joined across the right end portions of the intermediate header portions (18) and (19), and The inside is communicated through an aluminum communication member (21) that forms a passage.

  The heat exchange core (13) has a plurality of aluminum extrusions in which the width direction faces the ventilation direction (front-rear direction), the length direction faces the up-down direction, and is arranged in parallel in the left-right direction. Heat exchange pipe rows (23) made of flat heat exchange pipes (22) made of wood are provided in two rows at intervals in the front-rear direction, and adjacent to each heat exchange pipe row (23) in the left-right direction. (22) Aluminum corrugated fins (24) on the outside of the heat exchange pipes (22) of the front and rear heat exchange pipe rows (23) on the outside of the heat exchange pipes (22) at the left and right ends, respectively, ) Is placed and brazed to the heat exchange pipe (22), and aluminum side plates (25) are placed outside the corrugated fins (24) at the left and right ends and brazed to the corrugated fins (24). It is configured. The upper and lower ends of the heat exchange tube group (23) of the front heat exchange tube row (23) are connected to the refrigerant inlet header portion (14) and the first intermediate header portion (18) by brazing, respectively. The upper and lower ends of the heat exchange tube group (23) of the rear heat exchange tube row (23) are connected to the refrigerant outlet header portion (15) and the second intermediate header portion (19) by brazing, respectively. .

  An aluminum expansion valve mounting member (26) is brazed across the tip of the refrigerant inlet pipe (3) and the refrigerant outlet pipe (4), and the expansion valve (5) is mounted on the expansion valve mounting member (26). Yes. As shown in FIG. 2, the expansion valve mounting member (26) is formed with an inlet side refrigerant channel (27) having a circular cross section and an outlet side refrigerant channel (not shown) having a circular cross section in a penetrating manner. ing. A large-diameter portion (27a) is formed at one end of the inlet-side refrigerant flow path (27), and the distal end portion of the refrigerant inlet pipe (3) is inserted into the large-diameter portion (27a) so that the expansion valve mounting member It is joined to (26) by welding or brazing. The inlet side refrigerant flow path on the surface where the other end of the inlet side refrigerant flow path (27) of the expansion valve mounting member (26) (the end opposite to the side where the large diameter part (27a) is formed) is opened ( A male pipe portion (28) whose outer peripheral surface is formed into a cylindrical surface is integrally formed on the peripheral edge of the opening of (27) so as to protrude outward. An annular groove (29) is formed over the entire circumference on the outer peripheral surface of the male pipe portion (28), and an O-ring (31) is mounted in the annular groove (29).

  Although not shown, a large-diameter portion is formed at one end of the outlet-side refrigerant flow path, and the tip of the refrigerant outlet pipe (4) is inserted into the large-diameter portion so that the expansion valve mounting member (26 ) By welding or brazing. On the periphery of the opening of the outlet refrigerant flow path on the surface where the other end of the outlet refrigerant flow path of the expansion valve mounting member (26) is opened, a male pipe portion whose outer peripheral surface is a cylindrical surface is outward. It is integrally formed in a protruding shape. An annular groove is formed over the entire outer peripheral surface of the male pipe portion, and an O-ring is mounted in the annular groove.

  The expansion valve (5) is formed with a refrigerant supply path (32) having a circular cross section and a refrigerant discharge path (not shown) having a circular cross section. One end of the refrigerant supply path (32) has a cylindrical inner peripheral surface, and a male pipe part (28) on the inlet side refrigerant flow path (27) side of the expansion valve mounting member (26) is inserted. An insertion hole (33) is formed.

  Although not shown, one end of the refrigerant discharge passage has a cylindrical inner peripheral surface, and an insertion hole is formed into which the male pipe portion on the outlet refrigerant passage side of the expansion valve mounting member is inserted. Has been.

  Then, both male pipe portions (28) of the expansion valve mounting member (26) were inserted into the insertion hole portion (33) of the refrigerant supply passage (32) of the expansion valve (5) and the insertion hole portion of the refrigerant discharge passage. In the state, the expansion valve (5) and the expansion valve mounting member (26) are fixed by appropriate fastening means such as a male screw and a female screw, whereby the refrigerant inlet pipe (3) and the refrigerant outlet pipe (4) are The expansion valve (5) is connected to the refrigerant supply path (32) and the refrigerant discharge path, respectively.

  Here, when the inner diameter of the refrigerant supply path (32) of the expansion valve (5) is Amm and the inner diameter of the refrigerant inlet pipe (3) is Bmm, the relationship of B / A ≦ 1.0 is satisfied. When B / A> 1, the volume of the refrigerant increases when the refrigerant flows into the refrigerant inlet pipe (3) from the refrigerant supply path (32) of the expansion valve (5), and as a result, the refrigerant passes through the expansion valve (5). This is because the abnormal noise generated when passing is remarkably amplified. The lower limit of the inner diameter B of the refrigerant inlet pipe (3) is about 5 mm.

  Next, the results of experiments conducted to examine the performance of the product of the present invention and the comparative product will be described.

  As the product of the present invention, B / A = 0, where the inside diameter of the refrigerant inlet pipe (3) of the evaporator (1) is 6 mm and the inside diameter of the refrigerant supply path (32) of the expansion valve (5) is 8 mm. .75 was used. Further, as a comparative product, the inner diameter of the refrigerant inlet pipe (3) of the evaporator (1): B is 10.3 mm, the inner diameter of the refrigerant supply path (32) of the expansion valve (5): A is 8 mm, B / What set to A = 1.3 was used.

  And the compressor of the vehicle air conditioner provided with the evaporator (1) and the expansion valve (5) of the product of the present invention and the comparative product is set to a rotational speed corresponding to a vehicle speed of 40 to 60 km, and the air side The operation was performed at a temperature of 35 ° C. and a relative humidity (RH) of 60%, and the relationship between the frequency of the generated sound and the sound pressure level was determined. The result is shown in FIG.

  From the results shown in FIG. 3, it can be seen that the sound pressure level of the product of the present invention is lower than the sound pressure level of the comparative product in the frequency band of 5000 Hz or higher.

FIG. 4 shows a modification of the refrigerant inlet pipe and the expansion valve mounting member. In FIG. 4, the expansion valve mounting member (40) includes an inlet side through hole (41) having a circular cross section and an outlet side through hole having a circular cross section. A hole (not shown) is formed. The refrigerant inlet pipe (42) is passed through the inlet side through hole (41) of the expansion valve mounting member (40), and the tip end portion projects from the expansion valve mounting member (40) over a predetermined length. The protrusion protruding from the expansion valve mounting member (40) at the distal end of the refrigerant inlet pipe (42) is a fitting protrusion inserted into the insertion hole (33) of the refrigerant supply path (32) of the expansion valve (5). Part (43). The outer diameter of the fitting convex part (43) is larger than the other part of the refrigerant inlet pipe (42). An annular groove (44) is formed over the entire circumference of the outer peripheral surface of the fitting convex portion (43), and an O-ring (44) is mounted in the annular groove (33).

  Further, a large-diameter portion (41a) is formed at the end of the expansion valve mounting member (40) opposite to the fitting convex portion (43) in the entry side through hole (41), and a refrigerant inlet pipe ( An annular bead (42a) formed in 42) is fitted.

  Although not shown, the refrigerant outlet pipe is passed through the outlet-side through hole of the expansion valve mounting member (40), and the tip of the refrigerant outlet pipe projects from the expansion valve mounting member (40) over a predetermined length. A portion protruding from the expansion valve mounting member (40) at the tip of the refrigerant outlet pipe is a fitting convex portion that is inserted into the insertion hole of the refrigerant discharge path of the expansion valve (5). The outer diameter of the fitting convex part is larger than the other part of the refrigerant outlet pipe. An annular groove is formed over the entire outer peripheral surface of the fitting convex portion, and an O-ring is mounted in the annular groove.

  Then, both fitting projections (43) of the expansion valve mounting member (40) are inserted into the insertion hole (33) of the refrigerant supply passage (32) of the expansion valve (5) and the insertion hole of the refrigerant discharge passage. In this state, the expansion valve (5) and the expansion valve mounting member (40) are fixed by appropriate fastening means such as a male screw and a female screw, so that the refrigerant inlet pipe (42) and the refrigerant outlet pipe are respectively The expansion valve (5) is connected to the refrigerant supply path (32) and the refrigerant discharge path.

  Here, the relationship of B / A ≦ 1.0 is satisfied when the inner diameter of the refrigerant supply path (32) of the expansion valve (5) is Amm and the inner diameter of the refrigerant inlet pipe (3) is Bmm. The lower limit of the inner diameter B of the refrigerant inlet pipe (3) is about 5 mm.

  The evaporator according to the present invention is suitably used for a vehicle air conditioner.

(1): Evaporator
(2): Evaporator body
(3) (42): Refrigerant inlet pipe
(4): Refrigerant outlet pipe
(5): Expansion valve
(13): Heat exchange core
(14): Refrigerant inlet header
(15): Refrigerant outlet header

Claims (2)

A vehicle air conditioner is configured with a compressor, a refrigerant cooler that cools the refrigerant compressed by the compressor, and an expansion valve that has a refrigerant supply path and a refrigerant discharge path and depressurizes the refrigerant cooled by the refrigerant cooler An evaporator body having a refrigerant inlet header portion, a refrigerant outlet header portion and a heat exchange core portion, and a refrigerant having one end connected to the refrigerant inlet header portion of the evaporator main body and allowing the refrigerant to flow into the refrigerant inlet header portion An inlet pipe and a refrigerant outlet pipe having one end connected to the refrigerant outlet header of the evaporator body and allowing the refrigerant to flow out of the refrigerant outlet header, and the other end of the refrigerant inlet pipe is in communication with the refrigerant supply path In an evaporator configured to be connected to an expansion valve and having the other end of the refrigerant outlet pipe connected to the expansion valve in communication with the refrigerant discharge path,
An evaporator that satisfies the relationship B / A ≦ 1.0, where Amm is the inner diameter of the refrigerant supply path of the expansion valve and Bmm is the inner diameter of the refrigerant inlet pipe. A compressor, a refrigerant cooler that cools the refrigerant compressed by the compressor, an expansion valve that decompresses the refrigerant cooled by the refrigerant cooler, and an air conditioner for a vehicle including the evaporator according to claim 1,
A vehicle air conditioner that satisfies the relationship B / A ≦ 1.0, where the inner diameter of the refrigerant supply path of the expansion valve is A mm and the inner diameter of the refrigerant inlet pipe is B mm.

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