Vehicle air conditioning system

Abstract

To integrate the solenoid valve and heat exchanger in a vehicle air conditioning system. [Solution] The vehicle air conditioning system comprises a refrigeration cycle in which a refrigerant circulates, having a solenoid valve 24 and a heat exchanger 26 provided downstream of the solenoid valve 24 in the refrigerant flow direction, and a base 22 to which the solenoid valve 24 and the heat exchanger 26 are fixed. The base 22 includes a refrigerant inlet 30, a refrigerant outlet 32 ​​connected to a refrigerant inlet 82 of the heat exchanger 26, a tunnel-shaped internal flow path 36 connected between the refrigerant inlet 30 and the refrigerant outlet 32, an opening 42, and a control passage 43 connected from the opening 42 to a part of the internal flow path 36. The solenoid valve 24 includes a rod 62 that can reach a part of the internal flow path 36 through the control passage 43 from the opening 42 of the base 22. The solenoid valve 24 controls the opening of the internal flow path 36 according to the amount by which the rod 62 protrudes into a part of the internal flow path 36.

Description

【Technical Field】 【0001】 This specification relates to a vehicle air conditioner, and particularly discloses a vehicle air conditioner including a unit in which a solenoid valve and a heat exchanger are integrated. 【Background Art】 【0002】 A vehicle air conditioner includes a refrigeration cycle in which a refrigerant circulates. The refrigeration cycle includes a solenoid valve and a heat exchanger provided on the downstream side of the refrigerant flow direction of the solenoid valve. The heat exchanger exchanges heat between, for example, a refrigerant and a coolant. The solenoid valve is provided to switch the presence or absence of the refrigerant supplied to the heat exchanger or to adjust the amount of the refrigerant flowing into the heat exchanger. 【0003】 Patent Document 1 discloses a vehicle air conditioner including a refrigeration cycle using carbon dioxide as a refrigerant. 【Prior Art Documents】 【Patent Documents】 【0004】 【Patent Document 1】 Japanese Unexamined Patent Application Publication No. 2008-157588 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0005】 In a vehicle air conditioner, a solenoid valve and a heat exchanger are connected by a pipe. Connectors called joints are arranged at both ends of the pipe. The pipe is connected to the solenoid valve using a joint at one end and to the heat exchanger using a joint at the other end. However, space for arranging the pipe and the two joints is required inside the vehicle. In order to omit these pipe and the two joints, it is desired to integrate the solenoid valve and the heat exchanger. 【0006】 This specification discloses a configuration in which a solenoid valve and a heat exchanger in a vehicle air conditioner are integrated. 【Means for Solving the Problems】 【0007】 The vehicle air conditioning system disclosed herein comprises a refrigeration cycle in which a refrigerant circulates, having a solenoid valve and a heat exchanger provided downstream of the solenoid valve in the refrigerant flow direction, and a base to which the solenoid valve and the heat exchanger are fixed. The base includes a refrigerant inlet, a refrigerant outlet connected to the refrigerant inlet of the heat exchanger, a tunnel-shaped internal flow path connecting the refrigerant inlet and the refrigerant outlet, an opening, and a control passage leading from the opening to a portion of the internal flow path. The solenoid valve includes a rod that can reach a portion of the internal flow path through the control passage from the opening of the base. The solenoid valve controls the opening of the internal flow path in proportion to the amount by which the rod protrudes into the portion of the internal flow path. 【0008】 With this configuration, the solenoid valve and heat exchanger are connected by an internal flow path in the base, eliminating the need for pipes and two joints. Since the solenoid valve and heat exchanger are integrated in the base, the space required for the air conditioning system within the vehicle can be reduced. 【0009】 In the vehicle air conditioning system of this disclosure, the solenoid valve may be an expansion valve that reduces the pressure of the refrigerant, and the heat exchanger may be a chiller into which the refrigerant and coolant flow, evaporating the refrigerant and absorbing the heat of the coolant. 【0010】 In the vehicle air conditioning system of the present disclosure, the solenoid valve may be a control valve that switches the opening and closing of the internal flow path, and the heat exchanger may be a refrigerant cooler into which the refrigerant and coolant liquid flow and the coolant liquid cools the refrigerant. 【0011】 Furthermore, the vehicle air conditioning system disclosed herein comprises a refrigeration cycle in which a refrigerant circulates, having a first solenoid valve, a second solenoid valve, and a heat exchanger, and a base on which the first solenoid valve, the second solenoid valve, and the heat exchanger are fixed. The base includes a refrigerant inlet, a first refrigerant outlet connected to the refrigerant inlet of the heat exchanger, a second refrigerant outlet, and a tunnel-shaped internal flow path. The internal flow path of the base includes an inlet flow path extending from the refrigerant inlet, branching sections branching from the inlet flow path toward the first refrigerant outlet and the second refrigerant outlet, a first flow path connected between the branching section and the first refrigerant outlet, and a second flow path connected between the branching section and the second refrigerant outlet. The base includes a first opening and a first control passage that extends from the first opening to a portion of the first flow path. The first solenoid valve includes a first rod that is reachable from the first opening of the base through the first control passage to a portion of the first flow path. The first solenoid valve controls the opening of the first flow path in proportion to the amount by which the first rod protrudes into the portion of the first flow path. The base includes a second opening and a second control passage that extends from the second opening to a portion of the second flow path. The second solenoid valve includes a second rod that is reachable from the second opening of the base through the second control passage to a portion of the second flow path. The second solenoid valve controls the opening of the second flow path by the amount that the second rod protrudes into the portion of the second flow path. 【0012】 With this configuration, the first solenoid valve and the heat exchanger are connected by an internal flow path in the base, and the second solenoid valve and the second refrigerant outlet are also connected by an internal flow path in the base, thus reducing a relatively large number of components in the air conditioning system (pipes, joints, branch pipes, etc.). Since the two solenoid valves and the heat exchanger are integrated into the base, the space required for the air conditioning system within the vehicle can be reduced. [Effects of the Invention] 【0013】 According to the technology disclosed herein, the solenoid valve and the heat exchanger are integrated, which reduces the space required inside the vehicle for the air conditioning system. [Brief explanation of the drawing] 【0014】 [Figure 1] This is a schematic diagram showing the configuration of an air conditioning system. [Figure 2]It is a schematic diagram showing the refrigerant flow (solid line arrow) during cooling and the refrigerant flow (dotted line arrow) during heating. [Figure 3] The upper part is a schematic diagram showing the chiller unit 20, and the lower part is a schematic diagram showing the comparative technology. [Figure 4] (A) is a perspective view schematically showing the chiller unit 20, and (B) is a cross-sectional view taken along the line A-A of (A). [Figure 5] The upper part is a schematic diagram showing another chiller unit 20a, and the lower part is a schematic diagram showing the comparative technology. [Figure 6] (A) is a perspective view schematically showing the chiller unit 20a, (B) is a cross-sectional view taken along the line B-B of (A), and (C) is a cross-sectional view taken along the line C-C of (A). [Figure 7] The upper part is a schematic diagram showing the water-cooled GC unit 120, and the lower part is a schematic diagram showing the comparative technology. [Figure 8] The upper part is a schematic diagram showing another water-cooled GC unit 120a, and the lower part is a schematic diagram showing the comparative technology. 【Mode for Carrying Out the Invention】 【0015】 Hereinafter, embodiments will be described with reference to the drawings. In all the drawings, the same reference numerals are assigned to equivalent elements, and redundant explanations are omitted. In the following description, unless otherwise specified, the terms indicating the directions of front, back, left, right, up, and down represent the directions of the heat exchanger unit. In FIGS. 4 and 6, the direction of arrow Fr represents the front, the direction of arrow Up represents the upper, and the direction of arrow Lh represents the left. 【0016】 FIG. 1 is a schematic diagram showing the configuration of the air conditioner 12. The air conditioner 12 is mounted on an automobile as a vehicle. The air conditioner 12 includes a refrigeration cycle 14, a high-temperature coolant circuit 15, and a low-temperature coolant circuit 16. In the refrigeration cycle 14, the refrigerant circulates. The refrigerant may be carbon dioxide (R744). In each of the coolant circuits 15 and 16, the coolant circulates. 【0017】 The refrigeration cycle 14 includes a compressor 90, a solenoid valve 124, a solenoid valve 125, a water-cooled gas cooler 126 (referred to as water-cooled GC), an expansion valve 91, an air-cooled gas cooler 92 (referred to as air-cooled GC), a solenoid valve 93, a solenoid valve 24, a chiller 26, a solenoid valve 25, an evaporator 94, an accumulator 95, and a solenoid valve 96. In the refrigeration cycle 14, each device is connected by a refrigerant pipe, an internal flow path of a pedestal described below, etc. 【0018】 The water-cooled GC 126 (see FIG. 1) is a heat exchanger (refrigerant cooler) in which the refrigerant and the coolant of the coolant circuit 15 flow in, and the refrigerant is cooled by the coolant. The air-cooled GC 92 is a heat exchanger that exchanges heat between the refrigerant and air. The chiller 26 is a heat exchanger in which the refrigerant and the coolant of the coolant circuit 16 flow in, the refrigerant is evaporated, and the heat of the coolant in the coolant circuit 16 is absorbed. The evaporator 94 is disposed inside an air conditioning unit (HVAC: Heating, Ventilation, and Air Conditioning) and cools the air blown into the vehicle interior. 【0019】 The solenoid valves 24 and 25 function as expansion valves that reduce the pressure of the refrigerant. The solenoid valves 24 and 25 control the amount of refrigerant passing through the refrigerant flow path in multiple steps. The solenoid valve 124 functions as a control valve. The solenoid valves 93, 96, 124, and 125 control the refrigerant flow path in two steps of open or closed. These solenoid valves are connected to a controller (not shown) and operate according to commands output from the controller. The controller is a computer including a processor and a memory. 【0020】 The high-temperature coolant circuit 15 is configured by connecting a water-cooled GC 126, a heater 200, a heater core 202, and a pump 204 in sequence with coolant pipes. In the coolant circuit 15, the coolant pumped by the pump 204 becomes high-temperature by being heated by the refrigerant while passing through the water-cooled GC 126. The high-temperature coolant is sent to the heater core 202. The heater core 202 is disposed inside the air conditioning unit and heats the air blown into the vehicle interior. 【0021】 The low-temperature coolant circuit 16 is configured by sequentially connecting a chiller 26, a battery 300, and a pump 304 with coolant piping. The battery 300 supplies power to the motor, which is the power source of the vehicle. In the coolant circuit 16, the coolant pumped by the pump 304 becomes cold due to the absorption of heat by the refrigerant as it passes through the chiller 26. The cooled coolant is then sent to the battery 300 to cool the battery 300. 【0022】 Figure 2 shows the refrigerant flow during cooling with solid arrows and the refrigerant flow during heating with dotted arrows. During cooling, the refrigerant circulates sequentially through the compressor 90, solenoid valve 125, air-cooled GC 92 (refrigerant heat dissipation), solenoid valve 25, evaporator 94 (refrigerant heat absorption), and accumulator 95. Also during cooling, the refrigerant flowing out from the air-cooled GC 92 flows into the accumulator 95 after passing through the solenoid valve 24 and chiller 26 (refrigerant heat absorption). 【0023】 During heating, the refrigerant circulates sequentially through the compressor 90, solenoid valve 124, water-cooled GC126 (for refrigerant heat dissipation), expansion valve 91, air-cooled GC92 (for refrigerant heat absorption), solenoid valve 93, and accumulator 95. 【0024】 As shown in Figure 1, the air conditioning system 12 includes a heat exchanger unit that integrates a solenoid valve and a heat exchanger, located inside the dashed line. The chiller unit 20 is a heat exchanger unit that integrates a solenoid valve 24 and a chiller 26. The chiller unit 20a is a heat exchanger unit that integrates a solenoid valve 25 in addition to the solenoid valve 24 and chiller 26. In the air conditioning system 12, either the chiller unit 20 or the chiller unit 20a is selectively adopted. 【0025】 Furthermore, the water-cooled GC unit 120 is a heat exchanger unit that integrates the solenoid valve 124 and the water-cooled GC 126. The water-cooled GC unit 120a is a heat exchanger unit that integrates the solenoid valve 124 and the water-cooled GC 126, plus an additional solenoid valve 125. In the air conditioning system 12, either the water-cooled GC unit 120 or the water-cooled GC unit 120a is selectively adopted. 【0026】 First, the chiller unit 20 will be described. The upper part of Figure 3 is a schematic diagram showing the chiller unit 20, and the lower part of Figure 3 is a schematic diagram showing comparative technology. Figure 4(A) is a simplified perspective view of the chiller unit 20. Figure 4(B) is a cross-sectional view along line AA in Figure 4(A). In Figure 4(B), the internal cross-sections of the solenoid valve 24 and the chiller 26 are omitted. 【0027】 The chiller unit 20 comprises a base 22, a chiller 26, and a solenoid valve 24, as shown in Figure 4(A). The base 22 may be made of aluminum. The base 22 has an L-shape in cross-sectional view along the up, down, left, and right directions, and has a predetermined thickness in the front-to-back direction. The base 22 has a stepped shape, with the left side being one step lower than the right side. 【0028】 The chiller 26 is fixed to the upper left side (downward-sloping portion) of the base 22. The solenoid valve 24 is fixed to the upper right side (upward-sloping portion) of the base 22. The chiller 26 and the solenoid valve 24 may be fixed to the base 22 by screw fastening, brazing, etc. 【0029】 The solenoid valve 24 comprises a body 60 and a rod 62 (see Figure 4(B)) that is extendable downward from the body 60. The chiller 26 comprises a body 80, a refrigerant inlet 82, and a refrigerant outlet 83. The refrigerant inlet 82 is located at the bottom of the body 80, and the refrigerant outlet 83 is located at the top of the body 80. Inside the body 80 of the chiller 26, the refrigerant flows from bottom to top due to the pressure of the refrigerant. 【0030】 The chiller 26 also includes a coolant inlet and a coolant outlet (not shown). The coolant inlet and outlet are located on the side of the main body 80. The coolant inlet is located higher than the coolant outlet. Pipe 86 is connected to the coolant inlet of the chiller 26. Pipe 87 is connected to the coolant outlet of the chiller 26. Coolant flows into the main body 80 of the chiller 26 via pipe 86, and coolant that flows out of the main body 80 of the chiller 26 flows through pipe 87. Inside the main body 80 of the chiller 26, the coolant flows from top to bottom. 【0031】 As shown in Figure 4(B), the base 22 includes a refrigerant inlet 30, a refrigerant outlet 32, and an opening 42. The refrigerant inlet 30 is located on the right side of the base 22. The refrigerant outlet 32 ​​is located on the upper left side of the base. The opening 42 is located on the upper right side of the base 22. 【0032】 Inside the base 22 are an internal flow path 36, a reservoir 31, and a control passage 43. The internal flow path 36 and the control passage 43 may be formed in the base 22, for example, by drilling holes. The internal flow path 36 is connected between the refrigerant inlet 30 and the refrigerant outlet 32. The control passage 43 is connected to a part of the internal flow path 36 from the opening 42. The internal flow path 36 and the control passage 43 each have a circular cross-section and are tunnel-shaped. The reservoir 31 is provided on the downstream side of the internal flow path 36 in the direction of refrigerant flow. The refrigerant outlet 32 ​​is provided above the reservoir 31. The refrigerant outlet 32 ​​is connected to the refrigerant inlet 82 of the chiller 26. 【0033】 The solenoid valve 24 is equipped with a rod 62 that is extendable downward from the bottom of the main body 60. The rod 62 can reach a portion of the internal flow path 36 through the opening 42 of the base 22 and through the control passage 43. Figure 4(B) shows the rod 62 in a retracted state. The same figure also shows the position of the tip of the rod 62 when it is extended, indicated by a dashed line. The portion of the internal flow path 36 where the cross-section of the internal flow path 36 changes due to the rod 62 is the valve section 64. The solenoid valve 24 controls the opening degree of the internal flow path 36 (valve section 64) according to the amount by which the rod 62 protrudes into a portion of the internal flow path 36. 【0034】 A pipe 601 is connected to the refrigerant inlet 30 of the base 22 via a joint 501. A pipe 602 is connected to the refrigerant outlet 83 of the chiller 26 via a joint 502. 【0035】 The upper part of Figure 3 shows the internal flow path 36 of the chiller unit 20 with a dashed line. The lower part of Figure 3 shows a configuration in which the solenoid valve 24 and chiller 26 are not integrated, as a comparative example. In the comparative example, two joints 503, 504 and a pipe 603 are required between the solenoid valve 24 and the chiller 26. However, in the chiller unit 20, the two joints 503, 504 and the pipe 603 in the comparative example can be omitted. 【0036】 The chiller unit 20 and other heat exchanger units described below can reduce the number of parts in the air conditioning system and the space required for the air conditioning system within the vehicle. Furthermore, cost reduction, weight reduction, and improved ease of assembly into the vehicle due to the integration of multiple parts can be expected. The reduced number of connection points also lowers the risk of refrigerant leakage. This means that the need to replenish refrigerant decreases, reducing the burden on the user. Environmental impact due to refrigerant leakage can also be suppressed. Additionally, the integration of the solenoid valve and heat exchanger reduces the labor required for parts replacement, leading to improved serviceability. 【0037】 Furthermore, in refrigeration cycles using carbon dioxide as a refrigerant, the refrigerant is under high pressure, requiring the use of pressure-resistant equipment, which tends to result in larger equipment. Additionally, carbon dioxide refrigeration cycles tend to have a large number of components. However, technology that integrates solenoid valves and heat exchangers is expected to lead to miniaturization and a reduction in the number of components in carbon dioxide refrigeration cycles. 【0038】 Next, another chiller unit 20a will be described. The upper part of Figure 5 is a schematic diagram showing another chiller unit 20a, and the lower part of Figure 5 is a schematic diagram showing the comparative technology. Figure 6(A) is a simplified perspective view of chiller unit 20a. Figure 6(B) is a cross-sectional view along line BB in Figure 6(A). Figure 6(C) is a cross-sectional view along line CC in Figure 6(A). 【0039】 As shown in Figure 6(A), the chiller unit 20a comprises a base 23, a chiller 26, a solenoid valve 24, and a solenoid valve 25. Compared to the base 22 in Figure 4(A), the base 23 has a modified internal flow path 36, and a second refrigerant outlet 33, a second opening 52 (see Figure 6(C)), and a second control passage 53 have been added. Hereafter, the refrigerant outlet 32, opening 42, and control passage 43 described using Figure 4(B) will be referred to as the first refrigerant outlet 32, the first opening 42, and the first control passage 43, respectively. 【0040】 The chiller 26 is fixed to the upper left side (downward-sloping portion) of the base 23, as shown in Figure 6(A). The solenoid valve 24 is fixed to the upper right rear portion (upward-sloping portion) of the base 23. The solenoid valve 25 is fixed to the upper right front portion (upward-sloping portion) of the base 23. The chiller 26 and the solenoid valves 24 and 25 may be fixed to the base 23 by screw fastening, brazing, etc. 【0041】 Solenoid valve 25 has a structure similar to that of solenoid valve 24. As shown in Figure 6(C), solenoid valve 25 comprises a body 70 and a rod 72 that is extendable downward from the body 70. Hereinafter, solenoid valve 24 and solenoid valve 25 will be referred to as the first solenoid valve 24 and the second solenoid valve 25, respectively. Also, hereafter, the rod 62 of the first solenoid valve 24 and the rod 72 of the second solenoid valve 25 will be referred to as the first rod 62 and the second rod 72, respectively. 【0042】 The base 23 includes a refrigerant inlet 30, a first refrigerant outlet 32, a second refrigerant outlet 33, a first opening 42 (see Figure 6(B)), and a second opening 52 (see Figure 6(C)). The refrigerant inlet 30 is located in the center of the front-to-back direction on the right side of the base 23. The second refrigerant outlet 33 is located at the front of the right side of the base 23. The first refrigerant outlet 32 ​​is located on the upper left side of the base 23. The first opening 42 is located on the upper right rear of the base 23. The second opening 52 is located on the upper right front of the base 23. 【0043】 Inside the base 23 are an internal flow path 36, a reservoir 31, a first control passage 43, and a second control passage 53. As shown in Figure 6(A), the internal flow path 36 includes an inlet flow path 37, a branching section 38, a first flow path 40, and a second flow path 50. The inlet flow path 37 extends from the refrigerant inlet 30. The branching section 38 is the portion that branches off from the end of the inlet flow path 37 toward the first refrigerant outlet 32 ​​and the second refrigerant outlet 33, respectively. The first flow path 40 is connected between the branching section 38 and the first refrigerant outlet 32. The second flow path 50 is connected between the branching section 38 and the second refrigerant outlet 33. 【0044】 Figure 6(A) shows a portion of the first flow path 40 extending rearward from the branching section 38, and a connecting section c1 located at its rear end. The connecting section c1 is the point where a portion of the first flow path 40 extending in the front-rear direction intersects with a portion of the first flow path 40 extending in the up-down direction (see Figure 6(B)). Also, Figure 6(A) shows a portion of the second flow path 50 extending forward from the branching section 38, and a connecting section c2 located at its front end. The connecting section c2 is the point where a portion of the second flow path 50 extending in the front-rear direction intersects with a portion of the second flow path 50 extending in the up-down direction (see Figure 6(C)). 【0045】 The reservoir 31 is located downstream of the first flow path 40 in the refrigerant flow direction. The first refrigerant outlet 32 ​​is located above the reservoir 31. The first refrigerant outlet 32 ​​is connected to the refrigerant inlet 82 of the chiller 26. 【0046】 The first control passage 43 extends from the first opening 42 to a portion of the first flow path 40. The first control passage 43 has a circular cross-section and is tunnel-shaped. The first solenoid valve 24 includes a first rod 62 that is extendable downward from the bottom of the main body 60. The first rod 62 can reach a portion of the first flow path 40 by passing through the first control passage 43 from the first opening 42 of the base 23. Figure 6(B) shows the first rod 62 in a retracted state. The same figure also shows the position of the tip of the first rod 62 when it is extended, indicated by a dashed line. The portion of the first flow path 40 where the cross-section of the first flow path 40 changes due to the first rod 62 is the first valve section 64. The first solenoid valve 24 controls the opening degree of the first flow path 40 (first valve section 64) according to the amount by which the first rod 62 protrudes into a portion of the first flow path 40. 【0047】 The second control passage 53 extends from the second opening 52 to a portion of the second flow path 50. The second control passage 53 has a circular cross-section and is tunnel-shaped. The second solenoid valve 25 includes a second rod 72 that is extendable downward from the bottom of the main body 70. The second rod 72 can reach a portion of the second flow path 50 by passing through the second control passage 53 from the second opening 52 of the base 23. Figure 6(C) shows the second rod 72 in a retracted state. The same figure also shows the position of the tip of the second rod 72 when it is extended, indicated by a dashed line. The portion of the second flow path 50 where the cross-section of the second flow path 50 changes due to the second rod 72 is the second valve section 74. The second solenoid valve 25 controls the opening degree of the second flow path 50 (second valve section 74) according to the amount by which the second rod 72 protrudes into a portion of the second flow path 50. 【0048】 The refrigerant inlet 30 of the base 23 is provided with a pipe and joint similar to the pipe 601 and joint 501 shown in Figure 4(B). The refrigerant outlet 83 of the chiller 26 is connected to the pipe 602 via the joint 502. The second refrigerant outlet 33 of the base 23 is connected to the pipe 610 via the joint 510, as shown in Figure 4(C). 【0049】 The upper part of Figure 5 shows the internal flow path 36 of the chiller unit 20a with a dashed line. The lower part of Figure 5 shows a configuration in which the solenoid valves 24, 25 and the chiller 26 are not integrated, as a comparative technique. In the comparative technique, a branch structure 701 (branching pipe), two joints 501, 505 for the two solenoid valves 24, 25, and two joints 503, 504 and pipe 603 between the solenoid valves 24 and the chiller 26 are required. However, in the chiller unit 20a, the branch structure 701, the three joints 503, 504, 505, and pipe 603 found in the comparative technique can be omitted. 【0050】 The chiller unit 20a described above can achieve the same effects as the chiller unit 20 in Figures 3 and 4. Furthermore, since the first solenoid valve 24 and the chiller 26 are connected by the internal flow path 36 of the base 23, and the second solenoid valve 25 and the second refrigerant outlet 33 are also connected by the internal flow path 36 of the base 23, a relatively large number of parts (pipes, joints, branch pipes, etc.) in the air conditioning system 12 can be reduced. Because the two solenoid valves 24 and 25 and the chiller 26 are integrated by the base 23, the space required for the air conditioning system 12 inside the vehicle can be reduced. 【0051】 Next, the water-cooled GC unit 120 will be described. The upper part of Figure 7 is a schematic diagram showing the water-cooled GC unit 120, and the lower part of Figure 7 is a schematic diagram showing comparative technology. The water-cooled GC unit 120 uses a base that is almost the same as the base 22 of the chiller unit 20 explained using Figure 4. In the water-cooled GC unit 120, the water-cooled GC 126 is placed on the base in place of the chiller 26 of the chiller unit 20. Also, in the water-cooled GC unit 120, the solenoid valve 124 is placed on the base in place of the solenoid valve 24 of the chiller unit 20. 【0052】 In the upper part of Figure 7, the internal flow path 36 of the base of the water-cooled GC unit 120 is shown by a dashed line. The internal flow path 36 of the base of the water-cooled GC unit 120 has an additional branch section 39 between the solenoid valve 124 and the water-cooled GC 126 compared to the internal flow path 36 of the base 22 of the chiller unit 20 (see upper part of Figure 3). In the water-cooled GC unit 120, the branch section 39 is provided between the valve section 64 and the refrigerant outlet 32 ​​in the base 22 (see Figure 4(B)). In the water-cooled GC unit 120, as shown in the upper part of Figure 7, an internal flow path 36 is provided that leads from the branch section 39 to another refrigerant outlet 34. The refrigerant outlet 34 is located on the rear surface of the base. A pipe is connected to the refrigerant outlet 34 via a joint 503. 【0053】 The lower part of Figure 7 shows a configuration in which the solenoid valve 124 and the water-cooled GC 126 are not integrated, as a comparative example. In the comparative example, two joints 503 and 504 and a branch structure 703 (branching pipe) are required between the solenoid valve 124 and the water-cooled GC 126. However, in the water-cooled GC unit 120, the joints 504 and branch structure 703 in the comparative example can be omitted. The water-cooled GC unit 120 described above can also obtain the same effects as the chiller unit 20 in Figures 3 and 4. 【0054】 Next, the water-cooled GC unit 120a will be described. The upper part of Figure 8 is a schematic diagram showing the water-cooled GC unit 120a, and the lower part of Figure 8 is a schematic diagram showing the comparative technology. The water-cooled GC unit 120a uses a base that is almost the same as the base 23 of the chiller unit 20a described using Figure 6. In the water-cooled GC unit 120a, the water-cooled GC 126 is placed on the base in place of the chiller 26 of the chiller unit 20a. Also, in the water-cooled GC unit 120a, the solenoid valve 124 is placed on the base in place of the solenoid valve 24 of the chiller unit 20a, and the solenoid valve 125 is placed on the base in place of the solenoid valve 25 of the chiller unit 20a. 【0055】 In the upper part of Figure 8, the internal flow path 36 of the base of the water-cooled GC unit 120a is shown by a dashed line. The internal flow path 36 of the base of the water-cooled GC unit 120a has an additional branch section 39 between the solenoid valve 124 and the water-cooled GC 126 compared to the internal flow path 36 of the base 23 of the chiller unit 20a (see upper part of Figure 5). In the water-cooled GC unit 120a, the branch section 39 is provided between the first valve section 64 and the first refrigerant outlet 32 ​​in the base 23 (see Figure 6(B)). In the water-cooled GC unit 120a, as shown in the upper part of Figure 8, an internal flow path 36 is provided that leads from the branch section 39 to another refrigerant outlet 34. The refrigerant outlet 34 is provided on the rear surface of the base. A pipe is connected to the refrigerant outlet 34 via a joint 503. 【0056】 The lower part of Figure 8 shows a configuration in which the solenoid valves 124 and 125 and the water-cooled GC 126 are not integrated, as a comparative example. In the comparative example, two branch structures 701 and 703 (branching pipes), two joints 501 and 505 for the two solenoid valves 124 and 125, and two joints 503 and 504 between the solenoid valves 124 and the water-cooled GC 126 are required. However, in the water-cooled GC unit 120a, the two branch structures 701 and 703 and the two joints 504 and 505 found in the comparative example can be omitted. The water-cooled GC unit 120a described above can also obtain the same effects as the chiller unit 20a in Figures 5 and 6. [Explanation of symbols] 【0057】 12 Air conditioning unit, 14 Refrigeration cycle, 15,16 Coolant circuit, 20,20a Chiller unit (heat exchanger unit), 22,23 Base, 24 Solenoid valve (expansion valve, first solenoid valve), 25 Solenoid valve (expansion valve, second solenoid valve), 26 Chiller (heat exchanger), 30 Refrigerant inlet, 31 Reservoir, 32 Refrigerant outlet (first refrigerant outlet), 33 Second refrigerant outlet, 34 Refrigerant outlet, 36 Internal flow path, 37 Inlet flow path, 38,39 Branch section, 40 First flow path, 42 Opening (first opening), 43 Control passage (first control passage), 50 Second flow path, 52 Opening (second opening), 53 Control passage (second control passage), 60 Main body, 62 Rod (first rod), 64 Valve section (first valve section), 70 Main body, 72 rod (second rod), 74 valve section (second valve section), 80 main body, 82 refrigerant inlet, 83 refrigerant outlet, 86, 87 pipes, 90 compressor, 91 expansion valve, 92 air-cooled gas cooler, 93 solenoid valve, 94 evaporator, 95 accumulator, 96 solenoid valve, 120, 120a water-cooled GC unit (heat exchanger unit), 124 solenoid valve (control valve, first solenoid valve), 125 solenoid valve (second solenoid valve), 126 water-cooled gas cooler (heat exchanger, refrigerant cooler), 200 heater, 202 heater core, 204 pump, 300 battery, 304 pump, 501~505, 510 joint, 601~603, 610 pipe, 701, 703 branch structure.

Claims

[Claim 1] A vehicle air conditioning system, A refrigeration cycle in which a refrigerant circulates includes a solenoid valve and a heat exchanger provided on the downstream side of the solenoid valve in the direction of refrigerant flow, The solenoid valve and the heat exchanger are fixed to a base, The base includes a refrigerant inlet, a refrigerant outlet connected to the refrigerant inlet of the heat exchanger, a tunnel-shaped internal flow path between the refrigerant inlet and the refrigerant outlet, an opening, and a control passage extending from the opening to a part of the internal flow path. The solenoid valve includes a rod that can reach a portion of the internal flow path through the control passage from the opening of the base, and the solenoid valve controls the opening of the internal flow path in proportion to the amount by which the rod protrudes into the portion of the internal flow path. Vehicle air conditioning system. [Claim 2] A vehicle air conditioning system according to claim 1, The solenoid valve is an expansion valve that reduces the pressure of the refrigerant, The heat exchanger is a chiller into which the refrigerant and coolant flow, evaporating the refrigerant and absorbing the heat of the coolant. Vehicle air conditioning system. [Claim 3] A vehicle air conditioning system according to claim 1, The solenoid valve is a control valve that switches the opening and closing of the internal flow path, The heat exchanger is a refrigerant cooler into which the refrigerant and the cooling liquid flow, and the cooling liquid cools the refrigerant. Vehicle air conditioning system. [Claim 4] A vehicle air conditioning system, A refrigeration cycle in which a refrigerant circulates, comprising a first solenoid valve, a second solenoid valve, and a heat exchanger, The system comprises the first solenoid valve, the second solenoid valve, and a base on which the heat exchanger is fixed, The base includes a refrigerant inlet, a first refrigerant outlet connected to the refrigerant inlet of the heat exchanger, a second refrigerant outlet, and a tunnel-shaped internal flow path. The internal flow path of the base includes an inlet flow path extending from the refrigerant inlet, branching sections branching from the inlet flow path toward the first refrigerant outlet and the second refrigerant outlet, a first flow path connected between the branching section and the first refrigerant outlet, and a second flow path connected between the branching section and the second refrigerant outlet. The base includes a first opening and a first control passage extending from the first opening to a portion of the first flow path, the first solenoid valve includes a first rod that can reach a portion of the first flow path through the first control passage from the first opening of the base, and the first solenoid valve controls the opening of the first flow path in proportion to the amount by which the first rod protrudes into the portion of the first flow path. The base includes a second opening and a second control passage extending from the second opening to a portion of the second flow path, the second solenoid valve includes a second rod that is reachable from the second opening of the base through the second control passage to a portion of the second flow path, and the second solenoid valve controls the opening of the second flow path in proportion to the amount by which the second rod protrudes into the portion of the second flow path. Vehicle air conditioning system.

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