JP6736727B2 - Internal heat exchanger and refrigeration cycle of vehicle air conditioner including the same - Google Patents

Description

The present disclosure relates to an internal heat exchanger and a refrigeration cycle of a vehicle air conditioner including the internal heat exchanger.

As a means for improving the cooling capacity of the refrigeration cycle, an internal heat exchanger for exchanging heat between the relatively high temperature refrigerant flowing from the condenser to the expansion device and the relatively low temperature refrigerant flowing from the evaporator to the compressor is used. A configuration of arranging in a refrigeration cycle is known (for example, refer to Patent Document 1). Patent Document 1 discloses a configuration in which the internal heat exchanger 17 is provided in the vicinity of the air conditioning unit 30 and is arranged in the vehicle interior (the interior side of the dash panel 3) together with the air conditioning unit 30. The internal heat exchanger of Patent Document 1 has a tubular structure called a so-called double tube, and has a problem of poor heat exchange efficiency. On the other hand, an internal heat exchanger having a structure in which plates are stacked is known (for example, refer to Patent Document 2). This plate-stacked internal heat exchanger has higher heat exchange efficiency than the double-tube internal heat exchanger.

By the way, an expansion device used for a refrigeration cycle of a vehicle air conditioner is generally arranged in the vicinity of the evaporator in order to immediately allow the adiabatically expanded refrigerant to flow into the evaporator (see, for example, Patent Document 3). .. The expansion device is also a component that needs to be replaced due to a failure. In Patent Document 3, for example, the expansion device 1 is arranged in the vicinity of the air conditioning unit 30, and the expansion device 1 is required to be replaced. The expansion device 1 is passed through the pipe penetrating opening 16 provided in the dash panel D and the engine is passed through. It is disclosed that the room E can be removed.

JP, 2007-055553, A JP, 2007-139288, A JP, 2007-118654, A

Here, it can be assumed that the air-conditioning unit of Patent Document 1 uses the plate laminated internal heat exchanger of Patent Document 2. Then, the assumed air conditioning unit is naturally equipped with the expansion device. At this time, the expansion device is always arranged in the refrigerant passage between the internal heat exchanger and the evaporator. Further, the internal heat exchanger is arranged inside the vehicle compartment. Therefore, the internal heat exchanger is arranged between the dash panel and the expansion device. Therefore, in the air conditioning unit assumed from the combination of Patent Documents 1 and 2, it is extremely difficult to dispose the expansion device near the dash panel as in Patent Document 3.

However, the expansion device is a component that needs to be replaced due to a failure. For this reason, by making the expansion device replaceable from the engine room side, it is strongly required to secure workability without replacement from the vehicle interior side, where it is difficult to secure a working space because the air conditioner and glove box are located. To be Up to now, there is no known reference to the refrigeration cycle in which the internal heat exchanger is arranged in the vehicle compartment, which mentions the replacement work of the expansion device. When exchanging the expansion device used in the refrigeration cycle equipped with the internal heat exchanger, when working from the engine room side, the internal heat exchanger and the expansion device are removed, and the internal heat with a larger external shape than the expansion device is removed. It is necessary to remove the exchanger.

An object of the present disclosure is to provide an internal heat exchanger that enables attachment/detachment work of an expansion device from the engine room side through a through hole provided in a dash panel, and a refrigeration cycle of a vehicle air conditioner including the internal heat exchanger. ..

The internal heat exchanger according to the present invention is an internal heat exchanger equipped in a refrigeration cycle of a vehicle air conditioner having a compressor, a condenser, an expansion device, and an evaporator, and is formed by stacking plate-shaped members. , Heat exchange of the refrigerant between a first heat exchange path through which the refrigerant guided from the condenser to the expansion device flows and a second heat exchange path through which the refrigerant guided from the evaporator to the compressor flows A heat exchange part, a first inflow path through which the refrigerant flows from the condenser to the first heat exchange path, and a first outflow path through which the refrigerant flows from the second heat exchange path to the compressor flow A refrigerant inlet/outlet part, a second outflow passage through which the refrigerant is introduced from the first heat exchange passage to the expansion device, and a second inflow passage through which the refrigerant is introduced from the expansion device to the second heat exchange passage pass. An expansion device connecting part, wherein the expansion device connecting part has a first screw threaded part, and the internal heat exchanger is attached to and detached from the expansion device by a fixing member having a screw head part and a screw shaft part. Securing is possible, the screw shaft portion is inserted into the first screw threaded portion and is inserted into the fourth screw threaded portion provided in the expansion device, and the refrigerant inlet/outlet portion is the heat exchange portion. It is fixed to the plate-shaped member arranged on the surface of one side, the expansion device connection portion is fixed to the plate-shaped member arranged on the surface of the other side of the heat exchange portion, the heat exchange portion, A third screw threaded portion at a position on the same straight line with respect to the first screw threaded portion, the third screw threaded portion being capable of inserting the fixing member, and the screw shaft portion being The screw head is inserted into the third screw threaded portion, and the screw head is locked to the opening edge of the first screw threaded portion. The refrigerant inlet/outlet part is fixed to the plate-shaped member arranged on the surface of one side of the heat exchange part, and the expansion device connecting part is the plate-shaped part arranged on the surface of the other side of the heat exchange part. It is fixed to a member, and the heat exchange part has a third screw threaded part at a position on the same straight line as the first screw threaded part, and the third screw threaded part can insert the fixing member. The screw shaft portion is inserted into the third screw threaded portion, and the screw head is locked to the opening edge of the first screw threaded portion, so that the heat generated by tightening the fixing member is reduced. It is possible to prevent deformation of the exchange section.

In the internal heat exchanger according to the present invention, the first screw threaded portion has a counterbore portion at an end portion on the plate member side, and the screw shaft portion is inserted into the first screw threaded portion, Moreover, it is preferable that the screw head is housed in the counterbore. It is possible to prevent deformation of the heat exchange section due to tightening of the fixing member.

A refrigeration cycle of a vehicle air conditioner according to the present invention is characterized by including an internal heat exchanger according to the present invention.

According to the present disclosure, it is possible to provide an internal heat exchanger that enables attachment/detachment work of an expansion device from the engine room side through a through hole provided in a dash panel, and a refrigeration cycle of a vehicle air conditioner including the internal heat exchanger. ..

It is a system diagram showing an example of a refrigerating cycle provided with an internal heat exchanger concerning this embodiment. It is an exploded perspective view showing a connection structure of a first example of an internal heat exchanger and an expansion device concerning this embodiment. It is an exploded perspective view showing a connection structure of a second example of an internal heat exchanger and an expansion device concerning this embodiment. It is a perspective view showing the 3rd example of the internal heat exchanger concerning this embodiment. It is an exploded perspective view showing the connection structure of the 4th example of an internal heat exchanger concerning this embodiment, and an expansion device. It is a side view which shows the modification of the internal heat exchanger of a 4th example. It is a disassembled perspective view which shows the connection structure of the 5th example of the internal heat exchanger and expansion device which concern on this embodiment. It is a perspective view which shows the modification of a refrigerant inlet/outlet part or an expansion device connection part.

Hereinafter, one embodiment of the present invention will be described with reference to the accompanying drawings. The embodiments described below are examples of the present invention, and the present invention is not limited to the following embodiments. In addition, in the present specification and the drawings, components having the same reference numerals indicate the same components. Various modifications may be made as long as the effects of the present invention are exhibited.

The internal heat exchanger 100 according to the present embodiment is installed in a refrigeration cycle 1 of a vehicle air conditioner including a compressor 2, a condenser 3, an expansion device 4 and an evaporator 5, as shown in FIG. 1 or 2. In the internal heat exchanger, the first heat exchange path 111, which is configured by stacking plate-shaped members and through which the refrigerant guided from the condenser 3 to the expansion device 4 flows, and the refrigerant guided from the evaporator 5 to the compressor 2 are A heat exchange unit 110 that performs heat exchange of the refrigerant with the flowing second heat exchange path 112, and a first inflow path 121 and a second heat exchange path through which the refrigerant guided from the condenser 3 to the first heat exchange path 111 flows. From the refrigerant outlet/inlet part 120 through which the first outflow passage 122 through which the refrigerant guided from 112 to the compressor 2 flows, and from the second outflow passage 132 and the expansion device 4 through which the refrigerant guided from the first heat exchange passage 111 to the expansion device 4 flows. The expansion device connection part 130 through which the second inflow path 131 through which the refrigerant guided to the second heat exchange path 112 flows is provided. The expansion device connection part 130 has the first screw threaded part 133, and the internal heat exchanger. 100 is detachably fixed to the expansion device 4 by a fixing member 140 having a screw head 141 and a screw shaft part 142. The screw shaft part 142 is inserted into the first screw threaded part 133 and the expansion device 4 is inserted. It is inserted into the fourth screw threaded portion 41 provided on the.

The compressor 2 receives a driving force from an engine (not shown) or a driving force of a motor (not shown) driven by electric power to compress the low-temperature low-pressure vaporized state refrigerant to a high temperature. Use high-pressure vaporized refrigerant. The compressor 2 may be a fixed capacity type or a variable capacity type.

The condenser 3 is generally arranged in front of the radiator in the engine room at the tip (front) of the vehicle. The condenser 3 is a heat exchanger, and introduces the high-temperature and high-pressure vaporized refrigerant discharged from the compressor 2 from a grill opening (not shown) provided on the front surface of the vehicle such as the front grill. It is cooled by the outside air in the front of the vehicle to become a high temperature, high pressure liquefied refrigerant. The outside air introduced from the grille opening is generated by either or both of running of the vehicle and operation of a cooling fan (not shown).

The expansion device 4 decompresses and expands the refrigerant condensed by the condenser 3 by a throttling action to form a low-temperature low-pressure mist-like refrigerant (gas-liquid mixed refrigerant) and adjusts the flow rate of the refrigerant. ..

As shown in FIG. 2, the expansion device 4 includes a fourth threaded portion 41, a flow path 42 through which the refrigerant flowing into the evaporator 5 flows, and a flow path 43 through which the refrigerant discharged from the evaporator 5 flows. Have. It is preferable that the fourth screw threaded portion 41 be provided substantially parallel to the flow path 43 through which the refrigerant flowing out from the evaporator 5 flows. Here, “substantially parallel” means that the fourth screw threaded portion 41 and the flow path 43 are arranged in parallel without intersecting each other. The fourth threaded portion 41 is a space without an obstacle for passing the fixing member 140 through the expansion device 4, and is, for example, a tubular hole as shown in FIG. 2 or a U-shaped or V-shaped groove. (Not shown) or a bottomed screw hole (not shown) into which the fixing member 140 is screwed.

Pipes 63 and 64 are connected to the flow paths 42 and 43 of the expansion device 4, respectively. The pipes 63 and 64 are attached to the expansion device 4 by the joint portion 72, for example. The pipes 63, 64 preferably have fitting portions 63a, 64a protruding from the surface of the joint portion 72 on the side of the expansion device 4. An O-ring (not shown) is preferably attached to the outer peripheral surface of the fitting portions 63a and 64a. The pipes 63 and 64 can be attached to the expansion device 4 by lightly press-fitting the fitting portions 63a and 64a into the flow paths 42 and 43, respectively.

The evaporator 5 is a heat exchanger, which vaporizes the gas-liquid mixed refrigerant in the expansion device 4, and cools and dehumidifies the blast air passing through the evaporator 5 by the heat of evaporation at that time.

The internal heat exchanger 100 has a heat exchange section 110, a refrigerant inlet/outlet section 120, and an expansion device connecting section 130.

The heat exchange unit 110 has a laminated structure in which a plurality of plate-shaped members 101 pressed into a predetermined shape are laminated in the thickness direction thereof, and first heat exchange passages 111 and second heat exchange passages 112 are alternately arranged in parallel. Have. The internal heat exchanger 100 having such a laminated structure may be referred to as a plate laminated internal heat exchanger or a plate type internal heat exchanger. A relatively high temperature refrigerant flows through the first heat exchange passage 111, and a relatively low temperature refrigerant flows through the second heat exchange passage 112. In the heat exchange section 110, heat exchange of the refrigerant is performed between the first heat exchange passage 111 and the second heat exchange passage 112.

The refrigerant inlet/outlet part 120 is a connection part for connecting the pipes 62 and 65 to the heat exchange part 110. The first inflow passage 121 is a refrigerant flow passage between the pipe 62 and the first heat exchange passage 111. The first outflow passage 122 is a refrigerant passage between the second heat exchange passage 112 and the pipe 65.

The pipes 62 and 65 are attached to the refrigerant inlet/outlet part 120 by the joint part 71, for example. The pipes 62, 65 preferably have fitting portions 62a, 65a protruding from the surface of the joint portion 71 on the heat exchanger 100 side. An O-ring (not shown) is preferably attached to the outer peripheral surface of each of the fitting portions 62a and 65a. Then, the fitting portions 62a and 65a are lightly press-fitted into the first inflow passage 121 or the first outflow passage 122, respectively, whereby the pipes 62 and 65 can be attached to the refrigerant inlet/outlet portion 120.

The expansion device connection part 130 is a connection part for connecting the expansion device 4 to the heat exchange part 110. The second outflow passage 132 is a refrigerant passage between the first heat exchange passage 111 and the passage 42 of the expansion device 4. The second inflow path 131 is a refrigerant flow path between the flow path 43 of the expansion device 4 and the second heat exchange path 112.

The second outflow passage 132 and the second inflow passage 131 preferably have fitting portions 132a and 131a protruding from the surface of the expansion device connecting portion 130 on the expansion device 4 side. An O-ring (not shown) is preferably attached to the outer peripheral surface of the fitting portions 132a and 131a. Then, the expansion device connection portion 130 can be attached to the expansion device 4 by lightly press-fitting the fitting parts 132a and 131a into the flow paths 42 and 43 of the expansion device 4, respectively. The present invention is not limited to the form in which the expansion device connection portion 130 is directly connected to the expansion device 4 as shown in FIG. Pipes may be interposed (not shown) between the two inflow paths 131.

The first screw threaded portion 133 is an unobstructed space for passing the fixing member 140 through the inflator connection portion 130, and is, for example, the tubular hole shown in FIG. 2, the U-shaped groove or V shown in FIG. It is a V-shaped groove (not shown).

The fixing member 140 is a screw-like member for detachably fixing the internal heat exchanger 100 to the expansion device 4, and is, for example, a bolt. A hole 141a or a groove (not shown) for turning with a tool is preferably provided on the top surface of the screw head 141. Alternatively, it is preferable that the screw head 141 has a hexagonal shape (not shown) or the like, which can be turned by a tool. A screw groove 142a is preferably cut in a part or the whole of the screw shaft portion 142.

The screw shaft portion 142 is inserted into the first screw threaded portion 133 and the fourth screw threaded portion 41 provided in the expansion device 4. The screw shaft portion 142 penetrates the fourth screw threaded portion 41 and is inserted into the sixth screw threaded portion 72a provided in the joint portion 72, and the screw groove provided on the inner peripheral surface of the sixth screw threaded portion 72a. Screw into. Alternatively, the screw shaft portion 142 may be screwed into a groove provided in the fourth screw threading portion 41.

The refrigeration cycle 1 of the vehicle air conditioner according to this embodiment includes the internal heat exchanger 100 according to this embodiment. As shown in FIG. 1, the refrigeration cycle 1 has a closed circuit in which a compressor 2, a condenser 3, an expansion device 4, and an evaporator 5 are connected by pipes 61 to 65, and a refrigerant circulates inside the closed circuit. To do. The internal heat exchanger 100 is arranged on a closed circuit. The refrigerant is, for example, a fluorocarbon-based substance such as R134a, HFO-1234yf, or carbon dioxide. The refrigeration cycle 1 separates a gaseous refrigerant and a liquid refrigerant between the inside of the condenser 3 or between the condenser 3 and the internal heat exchanger 100 when the refrigerant circulating inside is a fluorocarbon material. In addition, a liquid tank (not shown) that stores a part of the refrigerant is provided. The refrigeration cycle 1 includes an accumulator (not shown) that stores a part of the refrigerant between the evaporator 5 and the compressor 2 when the refrigerant circulating inside is carbon dioxide. More preferably, an accumulator (not shown) is provided between the internal heat exchanger 100 and the compressor 2.

The pipe 61 connects the outlet of the compressor 2 and the inlet of the condenser 3 directly or indirectly. The pipe 62 connects the outlet part of the condenser 3 and the inlet part of the first inflow path 121 directly or indirectly. The pipe 63 connects the outlet of the expansion device 4 and the inlet of the evaporator 5 directly or indirectly. The pipe 64 connects the outlet of the evaporator 5 and the inlet of the second inflow path 131 directly or indirectly. The pipe 65 directly or indirectly connects the outlet of the first outflow passage 122 and the inlet of the compressor 2.

Among the components of the refrigeration cycle 1, the compressor 2 and the condenser 3 are arranged in the engine room E, and the internal heat exchanger 100, the expansion device 4 and the evaporator 5 are arranged in the vehicle compartment R. The engine compartment E and the vehicle compartment R are partitioned by a dash panel D. An HVAC unit (not shown) is arranged in the vehicle interior R. The HVAC unit has a blower (not shown), an expansion device 4, an evaporator 5, an air mix door (not shown), a heater core (not shown), and the like, and blows conditioned air into the vehicle interior R. The dash panel D may also be called a firewall or toe board.

The dash panel D has a through hole 91. The through hole 91 has a size that allows the expansion device 4 to be taken in and out. The through hole 91 is used to connect a device (for example, the compressor 2 or the condenser 3) arranged in the engine room E and a device (for example, the internal heat exchanger 100) arranged in the vehicle interior R. In addition to being an opening, the opening is for opening and closing the expansion device 4. Inside the vehicle interior R, the internal heat exchanger 100 is arranged near the dash panel D. When the through hole 91 is viewed from the engine room E side in a front view, the internal heat exchanger 100 is preferably arranged such that the refrigerant inlet/outlet portion 120 is present in a region surrounded by the opening edge of the through hole 91.

The internal heat exchanger according to the present embodiment includes the internal heat exchangers 100, 200, 300, 400, 500 of the first example to the fifth example depending on the manner of fixing to the expansion device 4. The internal heat exchanger of each example will be described.

The internal heat exchanger 100 of the first example will be described with reference to FIG. In the internal heat exchanger 100 of the first example, the refrigerant inlet/outlet portion 120 is fixed to the plate-like member 101b arranged on the surface on one side of the heat exchange portion 110, and the expansion device connection portion 130 is connected to the heat exchange portion 110. The refrigerant inlet/outlet portion 120 and the expansion device connecting portion 130 are fixed back to the plate-like member 101a disposed on the other surface, and the refrigerant inlet/outlet portion 120 is arranged back to back with the heat exchange portion 110 interposed therebetween. The second screw threaded portion 123 is provided at a position on the same straight line with respect to the threaded portion 133, and the heat exchange section 110 includes the third screw threaded portion 123 between the second screw threaded portion 123 and the first screw threaded portion 133. It is preferable that the screw shaft portion 142 has a portion 113a and that the screw shaft portion 142 be inserted into the second screw threaded portion 123 and the third screw threaded portion 113a.

The refrigerant inlet/outlet portion 120 and the expansion device connecting portion 130 are joined to the plate-like members 101b and 101a by brazing, for example.

The second threaded portion 123 is a space without an obstacle for passing the fixing member 140 through the refrigerant inlet/outlet portion 120, and is, for example, a tubular hole shown in FIG. 2, a U-shaped groove or V-shaped shown in FIG. 8. Groove (not shown).

The third screw threaded portion 113a is a space without an obstacle for passing the fixing member 140 through the heat exchange section 110. In the internal heat exchanger 100 of the first example, the heat exchange section 110 has the groove section 113 extending in the stacking direction of the plate-shaped members 101 (the XX′ direction), and the third screw threaded section 113a has the groove section. The space within 113 is preferable.

The groove 113 is, for example, a U-shaped groove or a V-shaped groove (not shown) shown in FIG. By forming the third screw threaded portion 113a in the groove shape, since the plate-shaped member 101 has a laminated structure on both sides of the third screw threaded portion 113a, the strength of the portion to which the fastening member 140 exerts the tightening force is secured. .. Therefore, deformation of the heat exchange portion due to tightening of the fixing member 140 is unlikely to occur. The groove 113 is formed by stacking the plate-shaped members 101 having notches so that the notches overlap.

An example of an assembling procedure of the expansion device 4 in the refrigeration cycle 1 including the internal heat exchanger 100 of the first example will be described. The assembling work is performed from the engine room E side. First, the expansion device 4 is attached to the joint part 72 by fitting the flow paths 42 and 43 of the expansion device 4 into the fitting parts 63 a and 64 a. Next, the internal heat exchanger 100 is attached to the expansion device 4 by fitting the fitting parts 132 a and 131 a of the expansion device connection part 130 into the flow paths 42 and 43 of the expansion device 4. Then, the fitting parts 62a and 65a are fitted to the first inflow passage 121 and the first outflow passage 122, so that the joint portion 71 is attached to the internal heat exchanger 100. Finally, the screw shaft portion 142 of the fixing member 140 includes the fifth screw threaded portion 71a, the second screw threaded portion 123, the third screw threaded portion 113a, the first screw threaded portion 133, and the fourth screw thread provided on the joint portion 71. It is inserted into the through portion 41 and screwed into a screw groove provided on the inner peripheral surface of the sixth screw through portion 72a. At this time, the screw head 141 is locked to the opening edge of the fifth screw threaded portion 71a.

An example of a procedure for removing the expansion device 4 in the refrigeration cycle 1 including the internal heat exchanger 100 of the first example will be described. The removal work is performed from the engine room E side. First, the fixing member 140 is removed. Next, the fitting portions 62a and 65a are pulled out from the first inflow passage 121 and the first outflow passage 122, and the joint portion 71 is removed from the internal heat exchanger 100. Next, by pulling the internal heat exchanger 100 toward the engine room E, the fitting portions 132a and 131a of the expansion device connecting portion 130 are pulled out from the flow paths 42 and 43 of the expansion device 4, and the internal heat exchanger is expanded from the expansion device 4. Remove 100. Next, the position of the internal heat exchanger 100 is shifted to the upper, lower, left, or right so that the expansion device 4 can be seen from the engine room E side. Finally, by pulling the expansion device 4 toward the engine room E, the flow paths 42 and 43 of the expansion device 4 fitted in the fitting portions 63a and 64a are opened, and the expansion device 4 is removed from the joint portion 72.

According to the internal heat exchanger 100 of the first example, the following effects can be obtained. First, the assembling and dismounting work of the expansion device 4 can be performed from the engine room E side. Since the joint portion 71, the internal heat exchanger 100, the expansion device 4 and the joint portion 72 can be fixed with one fixing member 140, the attachment/detachment work of the expansion device 4 can be performed by attaching/detaching the one fixing member 140. You can do it by a simpler procedure.

In the refrigeration cycle 1, it is preferable that the expansion device 4 be prevented from falling when the fixing member 140 is removed. The device for preventing the expansion device 4 from falling is, for example, as shown in FIG. 2, a structure for attaching the expansion device 4 to the joint portion 72 is such that the flow paths 42 and 43 of the expansion device 4 are fitted to the fitting portions 63a and 64a. It is a structure that is fitted to. In addition, a foam lining (not shown) is provided on the outer circumference of the expansion device 4 to be attached to a case (not shown) of the HVAC, or as a fixing member for the expansion device 4 and the joint portion 72, which is separate from the fixing member 140. A fixing member (not shown) may be used. The fixing member separate from the fixing member 140 is preferably, for example, a grommet that surrounds the periphery of the expansion device 4.

Up to this point, the form in which the joint part 71, the internal heat exchanger 100, the expansion device 4 and the joint part 72 are fixed by the fixing member 140 has been described, but the present invention is not limited to this. For example, the internal heat exchanger 100 and the expansion device 4 are fixed by the fixing member 140, and the fixing of the joint part 71 and the internal heat exchanger 100 and the fixing of the expansion device 4 and the joint part 72 are performed separately. A fixing member (not shown) may be used.

The internal heat exchangers 200 and 300 of the second example and the third example will be described with reference to FIGS. 3 and 4, respectively. Regarding the internal heat exchangers 200 and 300 of the second example and the third example, the description of the configuration common to the internal heat exchanger 100 of the first example is omitted, and the different configuration will be mainly described.

In the internal heat exchanger 200 of the second example, as shown in FIG. 3, the heat exchanging part 210 includes both surface layer portions 210A and 210B of the heat exchanging part 210 in the stacking direction of plate members (XX′ direction). , Has protrusions 214A and 214B that protrude in the same direction with respect to the inner layer portion 210C sandwiched between the two surface layer portions 210A and 210B, and one of the protrusions 214A and 214B has a refrigerant inlet/outlet. The part 120 is fixed, the expansion device connection part 130 is fixed to the other protrusion part 214A, and the projection part 214A to which the expansion device connection part 130 is fixed forms the first path 215 connected to the first screw thread part 133. The protruding portion 214B having the refrigerant inlet/outlet portion 120 fixed thereto has a second path 216 connected to the second screw threaded portion 123, and the third screw threaded portion 213 has a space in the first path 215 and a second path 215. It is preferably composed of a space inside the route 216 and a space 217 between the first route 215 and the second route 216.

The surface layer portion 210A includes a plate-shaped member 101a arranged on the other surface of the heat exchange portion 210. In FIG. 3, as an example, the surface layer portion 210A is shown to include a plate-shaped member 101a and a plate-shaped member 101c adjacent to the plate-shaped member 101a. The structure of the surface layer portion 210A is not limited to this, and in addition to the plate-shaped members 101a and 101c, it further includes one or more plate-shaped members arranged on the inner layer side of the heat exchange section 210 with respect to the plate-shaped member 101c. You may stay.

The surface layer portion 210B includes a plate member 101b arranged on one surface of the heat exchange portion 210. In FIG. 3, as an example, the surface layer portion 210B is shown to include a plate-shaped member 101b and a plate-shaped member 101d adjacent to the plate-shaped member 101b. The structure of the surface layer portion 210B is not limited to this, and in addition to the plate-shaped members 101b and 101d, it further includes one or more plate-shaped members arranged on the inner layer side of the heat exchange section 210 with respect to the plate-shaped member 101d. You may stay.

The inner layer portion 210C is made of a plate-shaped member other than the plate-shaped members 101a, 101b, 101c, 101d forming both surface layer portions 210A, 210B.

The projecting portions 214A and 214B extend the edges of the plate-shaped members 101a, 101b, 101c, and 101d that form both surface layer portions 210A and 210B in the same direction as the edges of the plate-shaped members that form the inner layer portion 210C. It is the part that made it.

The first path 215 and the second path 216 are spaces without obstacles for allowing the fixing member 140 to pass through the protrusions 214A and 214B, and are, for example, through holes as shown in FIG. It may be a V-shaped groove (not shown).

In the internal heat exchanger 200 of the second example, since the outer shape of each plate-shaped member 101 can be a simple shape such as a rectangle, the structure of the heat exchange section is simpler and the productivity is excellent.

In the internal heat exchanger 300 of the third example, as shown in FIG. 4, the heat exchange section 310 has a tubular hollow section 313 extending in the stacking direction of the plate-shaped members, and the third screw threaded section is a tubular section. It is preferable that the space is the space inside the hollow portion 313. The cylindrical hollow portion 313 is formed by stacking the plate-like members 101 having through holes so that the through holes overlap. Since the third threaded portion is surrounded by the laminated structure of the plate-shaped member 101, the strength of the portion to which the fastening force of the fixing member 140 is applied is secured. Therefore, deformation of the heat exchange portion due to tightening of the fixing member 140 is unlikely to occur.

Assembly and removal work of the expansion device 4 in the refrigeration cycle 1 including the internal heat exchangers 200 and 300 of the second example and the third example is the same as in the refrigeration cycle including the internal heat exchanger 100 of the first example. Then, according to the internal heat exchangers 200 and 300 of the second and third examples, the same effect as that of the internal heat exchanger 100 of the first example can be obtained.

The internal heat exchanger 400 of the fourth example will be described with reference to FIG. Regarding the internal heat exchanger 400 of the fourth example, the description of the configuration common to the internal heat exchanger 100 of the first example will be omitted, and the different configuration will be mainly described.

In the internal heat exchanger 400 of the fourth example, the refrigerant inlet/outlet part 420 is fixed to the plate-like member 101b arranged on the surface of one side of the heat exchange part 410, and the expansion device connecting part 130 is connected to the heat exchange part 410. The heat exchange part 410 is fixed to the plate-shaped member 101a arranged on the surface on the other side, and the heat exchange part 410 has a third screw threaded part 413a at a position on the same straight line as the first screw threaded part 133. The screw threaded portion 413a is capable of inserting the fixing member 140, the screw shaft portion 142 is inserted into the third screw threaded portion 413a, and the screw head 141 is engaged with the opening edge of the first screw threaded portion 133. It is preferably stopped.

In the internal heat exchanger 400 of the fourth example, it is preferable that the refrigerant inlet/outlet portion 420 has the second screw threaded portion 423. The second screw threaded portion 123 of the internal heat exchanger 100 of the first example was a portion that contributes to the fixation of the internal heat exchanger 100 and the expansion device 4, while the internal heat exchanger of the fourth example. The second threaded portion 423 of 400 does not contribute to the fixation of the internal heat exchanger 400 and the expansion device 4. Specifically, when the internal heat exchanger 400 and the expansion device 4 are in a fixed state, the fixing member 140 that fixes the internal heat exchanger 400 and the expansion device 4 is not arranged in the second screw threaded portion 423.

The second threaded portion 423 of the internal heat exchanger 400 of the fourth example preferably contributes to the fixation of the joint portion 71 and the internal heat exchanger 400. Specifically, a fixing member 150 that is separate from the fixing member 140 is used to fix the joint portion 71 and the internal heat exchanger 400, and the screw shaft portion 151 of the fixing member 150 is the fifth screw of the joint portion 71. It is inserted through the through portion 71a and is screwed into a screw groove provided on the inner peripheral surface of the second screw through portion 423. Further, the screw head 151 is locked to the opening edge of the fifth screw threaded portion 71a.

In the internal heat exchanger 400 of the fourth example, the second threaded portion 423 is not arranged on the extension line of the first threaded portion 133 as shown in FIG. 5, or is the same as the first threaded portion 133. You may arrange|position in a position on a line (not shown). It is more preferable that the second screw threaded portion 423 is not arranged on the extension line of the first screw threaded portion 133. When the second screw threaded portion 423 is arranged on the same line as the first screw threaded portion 133, the size of the second screw threaded portion 423 is set to a size that allows the fixing member 140 to be inserted.

The third screw threaded portion 413a of the internal heat exchanger 400 of the fourth example is a work space for attaching and detaching the fixing member 140. When the internal heat exchanger 400 and the expansion device 4 of the fourth example are in a fixed state, the fixing member 140 that fixes the internal heat exchanger 400 and the expansion device 4 is not arranged in the third screw threaded portion 413a.

Like the internal heat exchanger 100 of the first example, the third screw threaded portion 413a is preferably a space inside the groove portion 413 provided in the heat exchange portion 410. The present invention is not limited to this. The third screw threaded portion 413a is, for example, similar to the internal heat exchanger 200 of the second example, the space inside the first path 215, the space inside the second path 216, and the first path 215 and the second path 216. It may be a space 217 between them (shown in FIG. 3) or a space inside the cylindrical hollow portion 313 (shown in FIG. 4) as in the internal heat exchanger 300 of the third example.

In the internal heat exchanger 400 of the fourth example, when the through hole 91 (illustrated in FIG. 1) of the dash panel D is viewed from the engine room E side in a front view, the refrigerant is provided in a region surrounded by the opening edge of the through hole 91. It is preferable that the inlet/outlet part 420 and the third screw threaded part 413a are arranged so as to be present.

In the internal heat exchanger 400 of the fourth example, as shown in FIG. 6, the first screw threaded portion 133 has a counterbore portion 133a at the end on the plate member 101 side, and the screw shaft portion 142 is It is preferable that the first screw thread portion 133 is inserted and the screw head 141 is housed in the spot facing portion 133a. The counterbore part 133a is an enlarged diameter part in which the diameter of the end of the first screw threaded part 133 is increased from that of the other part.

An example of an assembling procedure of the expansion device 4 in the refrigeration cycle 1 including the internal heat exchanger 400 of the fourth example will be described with reference to FIG. First, each component is attached in the same manner as when the internal heat exchanger 100 of the first example is provided. Then, the fixing member 140 is passed through the third screw threading portion 413a. Then, the screw shaft portion 142 of the fixing member 140 is inserted into the first screw passing portion 133 and the fourth screw passing portion 41, and is provided on the inner peripheral surface of the fourth screw passing portion 41 or the sixth screw passing portion 72a. It is screwed into the thread groove. At this time, the screw head 141 is locked to the opening edge of the first screw threaded portion 133. Further, the screw shaft portion 152 of the fixing member 150, which is separate from the fixing member 140, is inserted into the fifth screw passing portion 71a and the second screw passing portion 423 of the joint portion 71, and the inner peripheral surface of the second screw passing portion 423 is inserted. It is screwed into the thread groove provided in the. At this time, the screw head 151 is locked to the opening edge of the fifth screw threaded portion 71a.

An example of a procedure for removing the expansion device 4 in the refrigeration cycle 1 including the internal heat exchanger 400 of the fourth example will be described with reference to FIG. First, the tool is inserted into the third threaded portion 413a, and the fixing member 140 is removed. Further, the fixing member 150 is removed. Then, the expansion device 4 can be removed as in the case where the internal heat exchanger 100 of the first example is provided.

According to the internal heat exchanger 400 of the fourth example, the following effects can be obtained. Since the heat exchange section 410 is not included in the tightening target of the fixing member 140, it is possible to prevent the heat exchange section 410 from being deformed due to the tightening of the fixing member 140. Further, since the length of the fixing member 140 can be shortened, the work from the engine room E side can be facilitated.

The internal heat exchanger 500 of the fifth example will be described with reference to FIG. 7. The description of the internal heat exchanger 500 of the fifth example common to that of the internal heat exchanger 100 of the first example is omitted, and the different structure will be mainly described.

In the internal heat exchanger 500 of the fifth example, the refrigerant inlet/outlet part 520 is arranged on the side 102 side of the plate-shaped member, and the expansion device connecting part 530 is located on the side 103 side opposite the side 102 side of the plate-shaped member. The opening of the first screw threaded portion 533 is arranged so as to face the side 102, and the refrigerant inlet/outlet portion 520 and the expansion device connecting portion 530 are on the same side in the stacking direction (XX′ direction) of the plate-shaped members. The screw shaft portion (not shown) is inserted into the first screw threaded portion 533, and the screw head (not shown) is locked to the opening edge of the first screw threaded portion 533. Is preferred.

The internal heat exchanger 500 of the fifth example is greatly different from the internal heat exchangers 100, 200, 300, 400 of the first to fourth examples in that the internal heat exchangers 100, 200 of the first to fourth examples are different. 200, 300, and 400 are arranged with the plate surface of the plate-shaped member in a direction substantially parallel to the dash panel D, whereas the internal heat exchanger 500 of the fifth example is the plate of the plate-shaped member. This is the point that the surface is arranged in a direction substantially orthogonal to the dash panel D.

When the plate-shaped member has, for example, a rectangular shape, it is preferable that one side 102 of the plate-shaped member is one short side and the opposite side 103 is the other short side.

The refrigerant inlet/outlet portion 520 preferably has a second screw threaded portion 523. The second threaded portion 523 does not contribute to fixing the internal heat exchanger 500 and the expansion device. Specifically, when the internal heat exchanger 500 and the expansion device are in a fixed state, the fixing member that fixes the internal heat exchanger 500 and the expansion device is not arranged in the second screw thread portion 523.

The second screw threaded portion 523 may not be arranged on the extension line of the first screw threaded portion 533, or may be arranged on the same line as the first screw threaded portion 533. When arranging the second screw threaded portion 523 on the same line as the first screw threaded portion 533, the size of the second screw threaded portion 523 is fixed to the internal heat exchanger 500 and the expansion device 4. The fixing member has a size that allows insertion.

The expansion device connection portion 530 is arranged with the opening of the first screw threaded portion 533 facing the side 102. The side 102 side is the engine room E side. By disposing the opening of the first screw threaded portion 533 toward the side 102 side, the work of attaching and detaching the fixing member can be performed from the engine room E side.

The refrigerant inlet/outlet portion 520 and the expansion device connecting portion 530 are arranged on the same side in the laminating direction (X-X′ direction) of the plate-shaped members, which means that the refrigerant inlet/outlet portion 520 and the expansion device connecting portion 530 are It means that it is on the extended surface of the surface of the plate-shaped member 101a arranged on the surface of one side of the heat exchange section 510, or in the space on the opposite side of the extended surface from the heat exchange section 510 side. ..

In the internal heat exchanger 500 of the fifth example, the inlet 111a of the first heat exchange passage, the outlet 111b of the first heat exchange passage, the inlet 121a of the second heat exchange passage, and the outlet 121b of the second heat exchange passage are heat exchange portions. Opened on the surface of the plate-shaped member 101a arranged on the surface on one side of 510, the refrigerant inlet/outlet portion 520 connects the first inflow passage 121 and the first outflow passage 122 to an extension line of the first screw threaded portion 533. The expansion device connection part 530 is arranged in a direction substantially parallel to the second outflow passage 132 and the second inflow passage 131 in a direction substantially parallel to the extension line of the first screw threaded portion 533. The internal heat exchanger 500 includes a first direction conversion member 800 that connects the heat exchange unit 510 and the refrigerant inlet/outlet unit 520, and a second direction conversion member 900 that connects the heat exchange unit 510 and the expansion device connection unit 530. The first direction changing member 800 includes a first connection path 801 that connects the first inflow path 121 and the inlet 111a of the first heat exchange path, an outlet 121b of the second heat exchange path, and a first outflow path. The second direction conversion member 900 has a second connection path 802 that connects the second heat conversion path 122 and the second connection path 802 that connects the second heat transfer path 122 and the second outflow path 132. And a fourth connection path 902 connecting between the second inflow path 131 and the inlet 121a of the second heat exchange path.

In the internal heat exchanger 500 of the fifth example, the first inflow passage 121 and the first outflow passage 122 are arranged in a direction substantially parallel to the extension line of the first screw threaded portion 533. The second outflow passage 132 and the second inflow passage 131 are arranged in a direction substantially parallel to the extension line of the first screw threaded portion 533. Here, the arrangement in the substantially parallel direction will be described by taking the first inflow passage 121 and the first outflow passage 122 as an example, and the first inflow passage 121 and the first outflow passage 122 have the first screw passage portion 533. It extends without crossing the extension line. The term “substantially parallel” means that the extension line of the first screw threaded portion is tilted in a range of, for example, ±5° with respect to the central axis of the first inflow passage 121 or the first outflow passage 122, in addition to the strictly parallel state. Including the state.

In the internal heat exchanger 500 of the fifth example, the expansion device connecting portion 530 has the claw portion 535 that engages with the expansion device (not shown), and the first screw threaded portion 533 and the claw portion 535 are the expansion device. When the connecting portion 530 is viewed from the side Z on which the expansion device is arranged, it is preferable that the connection portion 530 is arranged so as to satisfy the relationship of sandwiching the center of gravity of the expansion device connecting portion 530. The claw portion 535 is provided at the distal end portion of the extending portion 534 that extends from the surface of the expansion device connecting portion 530 on the side Z where the expansion device is arranged toward the side Z where the expansion device is arranged. The extension 534 may be integral with or separate from the inflator connection 530. By engaging the claw portion 535 with the expansion device and inserting the fixing member (not shown) through the first screw threaded portion 533 and the fourth screw threaded portion of the expansion device, the expansion device connection portion 530 is formed on both side surfaces of the expansion device. Fixed to. As a result, the internal heat exchanger 500 can be fixed to the expansion device without rattling.

The first direction changing member 800 includes a first plate 810 arranged on the heat exchange section 510 side, a second plate 820 arranged on the opposite side to the heat exchange section 510 side, the first plate 810 and the second plate. 820 and an intermediate plate 830 disposed between the two.

The first plate 810 includes a first communication port 813 that communicates with the inlet 111a of the first heat exchange passage, a second communication port 814 that communicates with the outlet 121b of the second heat exchange passage, and a plate that swells outward to expand the first plate 810. A first connection path forming bulge portion 811 forming the first connection path 801 and a second connection path forming bulge portion 812 forming the second connection path 802 by bulging the plate outward. .. The one end portion 812a and the other end portion 812b of the second connection path forming bulging portion 812 are located at a position closer to the first end portion 811a and the other end portion 811b of the first connecting path forming bulging portion 811 than the other end portion 812a. One plate 810 is on one side 815 side.

The second plate 820 has a first connection path forming bulge portion 821 that bulges the plate outward to form a first connection path 801 and a second connection path 802 that bulges the plate outward. A second connection path forming bulge portion 822 to be formed. The one end portion 822a and the other end portion 822b of the second connection path forming bulging portion 822 are located closer to each other than the one end portion 821a and the other end portion 821b of the first connecting path forming bulging portion 821. The two plates 820 are on one side 825 side.

The intermediate plate 830 has a first cutout 831 that connects the first connection path forming bulge 811 of the first plate 810 and the first connection path forming bulge 821 of the second plate 820, and the first plate 810. The second notch 832 for connecting the second connection path forming bulge 812 and the second connection path forming bulge 822 of the second plate 820.

The first direction changing member 800 arranges the first plate 810 and the second plate 820 such that one side 815 of the first plate 810 and one side 825 of the second plate 820 are on the same side, and the first plate 810 is disposed. And the second plate 820, the intermediate plate 830 is sandwiched and joined. As a result, the first connection path 801 includes the first connection path forming bulge portion 811 of the first plate 810, the first cutout 831 of the intermediate plate 830, and the first connection path forming bulge portion of the second plate 820. The protruding portion 821 is formed so as to be overlapped. The second connection path 802 includes a second connection path forming bulge portion 812 of the first plate 810, a second notch 832 of the intermediate plate 830, and a second connection path forming bulge of the second plate 820. The part 822 is formed to be overlapped. At this time, the first connecting path 801 and the second connecting path 802 do not cross over. The method of joining the plates is not particularly limited, but is brazing, for example.

The fixing of the first direction changing member 802 to the heat exchange section 510 is performed as follows. The outer surface of the first plate 810 is joined to the surface of the plate-shaped member 101a arranged on the surface on one side of the heat exchange section 510. At this time, the first communication port 813 and the second communication port 814 are joined so as to overlap the inlet 111a of the first heat exchange passage and the outlet 121b of the second heat exchange passage, respectively. As a result, the first direction changing member 800 is fixed to the heat exchange section 510. Further, the first connection path 801 and the second connection path 802 are joined to the first inflow path 121 and the first outflow path 122. As a result, the first direction changing member 800 is fixed to the refrigerant inlet/outlet portion 520.

The second direction changing member 900 includes a first plate 910 arranged on the heat exchange section 510 side, a second plate 920 arranged on the opposite side to the heat exchange section 510 side, the first plate 910 and the second plate. 920 and an intermediate plate 930 disposed therebetween.

The first plate 910 includes a third communication port 913 that communicates with the outlet 111b of the first heat exchange passage, a fourth communication port 914 that communicates with the inlet 121a of the second heat exchange passage, and a plate that swells outward to form the first plate 910. A third connecting path forming bulge portion 911 forming the third connecting path 901, and a fourth connecting path forming bulging portion 912 forming the fourth connecting path 902 by bulging the plate outward. .. The third connection path forming bulge portion 911 has a bent portion 911c, and the end portion 911a of the third connection path forming bulge portion 911 connected to the third communication port 913 is a third connection path forming bulge. It is on one side 915 side of the first plate 910 rather than the end portion 911b connected to the second outflow passage 132 of the portion 911. One end portion 912a and the other end portion 912b of the fourth connection path forming bulging portion 912 are the first end portion 911b of the third connection path forming bulging portion 911 that is connected to the second outflow passage 132 first. It is on one side 915 side of the plate 910.

The second plate 920 has a third connection path forming bulge portion 921 that bulges the plate outward to form a third connection path 901 and a fourth connection path 902 that bulges the plate outward. And a fourth connection path forming bulged portion 922 to be formed. The fourth connection path forming bulging portion 922 has a bent portion 922c, and the end 922b of the fourth connection path forming bulging portion 922 connected to the second inflow path 131 is the fourth connection path forming bulge. It is on one side 925 side of the second plate 920 than the end 922a of the portion 922 that is connected to the fourth communication port 914. Further, the end portion 922b of the fourth connection path forming bulging portion 922 that is connected to the second inflow path 131 is closer than the one end portion 921a and the other end portion 921b of the third connecting path forming bulging portion 921. It is on one side 925 side of the second plate 920.

The intermediate plate 930 includes a first notch 931 that connects the third connection path forming bulge 911 of the first plate 910 and the third connection path forming bulge 921 of the second plate 920, and the first plate 910. Second notch 932 connecting the fourth connection path forming bulge 912 of the second plate 920 and the fourth connection path forming bulge 922 of the second plate 920, the fourth communication port 914, and the fourth connection path forming bulge. And a through hole 933 connected to the projecting portion 922.

The second direction changing member 900 arranges the first plate 910 and the second plate 920 such that one side 915 of the first plate 910 and one side 925 of the second plate 920 are on the same side, and the first plate 910 is disposed. And the second plate 920, the intermediate plate 930 is sandwiched and joined. As a result, the third connection path 901 includes the third connection path forming bulge portion 911 of the first plate 910, the first notch 931 of the intermediate plate 930, and the third connection path forming bulge portion of the second plate 920. The projecting portion 921 is formed so as to overlap. The fourth connection path 902 includes a fourth connection path forming bulge portion 912 of the first plate 910, a second notch 932 of the intermediate plate 930, and a fourth connection path forming bulge of the second plate 920. The part 922 is formed to be overlapped. At this time, the third connecting path 901 and the fourth connecting path 902 cross each other. The method of joining the plates is not particularly limited, but is brazing, for example.

Further, it is preferable that the third connection path 901 is arranged on the lower side of the vehicle than the fourth connection path 902. The element portion 4a (shown in FIG. 2) of the inflator can be arranged toward the upper side of the vehicle, and good operability of the inflator 4 can be ensured.

In the internal heat exchanger 500 of the fifth example, the inlet 111a of the first heat exchange passage and the inlet 121a of the second heat exchange passage are arranged on one side 104 side of the plate-shaped member and the outlet 121b of the second heat exchange passage. The outlet 111b of the first heat exchange path is arranged on the side 105 side opposite to the one side 104 side of the plate-shaped member, and the second direction conversion member 900 crosses the third connection path 901 and the fourth connection path 902 in a three-dimensional manner. The first inflow path 121 and the second outflow path 132 are arranged on the side 104 side, and the second inflow path 131 and the first outflow path 122 are arranged on the side 105 opposite to each other. It is preferable that the intersecting portion is not arranged on the extension line of the first screw threading portion 533.

When the plate-shaped member has, for example, a rectangular shape, one side 104 of the plate-shaped member is preferably one long side and the opposite side 105 is preferably the other long side.

When the third connecting path 901 and the fourth connecting path 902 are three-dimensionally crossed, the intersecting portion includes a third connecting path forming bulge portion 911 of the first plate 910 and a fourth connecting path forming bulge portion of the second plate 920. It is the output part 922. Since the third connecting path forming bulging part 911 and the fourth connecting path forming bulging part 922 have the bent parts 911c and 922c, respectively, the third connecting path 901 and the fourth connecting path 902 cross over. The first inflow path 121 and the second outflow path 132 are arranged on the side 104 side, and the second inflow path 131 and the first outflow path 122 are arranged on the opposite side 105 side. As a result, the layout of the pipes 62, 63, 64, 65 (shown in FIG. 1) can be made common between the specifications with the internal heat exchanger 500 and the specifications without the internal heat exchanger 500. Further, since the intersecting portion (the third connecting passage forming bulging portion 911 and the fourth connecting passage forming bulging portion 922) is not arranged on the extension line of the first screw threading portion 533, the fixing from the engine room side is performed. A work space for attaching and detaching members is secured.

In FIG. 7, the first connecting path 801 and the second connecting path 802 do not cross over and the third connecting path 901 and the fourth connecting path 902 cross over, but the invention is not limited to this. The first connecting path 801 and the second connecting path 802 may cross over, and the third connecting path 901 and the fourth connecting path 802 may not cross over. By applying the configuration of the second direction changing member 900 to the first direction changing member 800, the first connecting path 801 and the second connecting path 802 can cross each other.

The fixing of the second direction changing member 900 to the heat exchange section 510 is performed as follows. The outer surface of the first plate 910 is joined to the surface of the plate-shaped member 101a arranged on the surface on one side of the heat exchange section 510. At this time, the third communication port 913 and the fourth communication port 914 are joined so as to overlap the outlet 111b of the first heat exchange passage and the inlet 121a of the second heat exchange passage, respectively. As a result, the second direction changing member 900 is fixed to the heat exchange section 510. The third connecting path 901 and the fourth connecting path 902 are joined to the second outflow path 132 and the second inflow path 131. As a result, the second direction changing member 900 is fixed to the expansion device connecting portion 530.

By the first direction changing member 800 and the second direction changing member 900, the flow direction of the refrigerant is a direction (Y-Y' direction) intersecting with a direction along the stacking direction (XX' direction) of the heat exchange section 510. ) Can be changed to.

An example of an assembling procedure of the expansion device in the refrigeration cycle including the internal heat exchanger 500 of the fifth example will be described. First, each component is attached in the same manner as when the internal heat exchanger 400 of the fourth example is provided. Next, the fixing member is passed from the engine room E side toward the first screw threaded portion 533 along the plate surface of the plate-shaped member 101a. Then, the screw shaft portion of the fixing member 140 (illustrated in FIG. 5) is inserted into the first screw threaded portion 533 and the fourth screw threaded portion 41 (illustrated in FIG. 5), and the fourth screw threaded portion 41 or the sixth screw threaded portion 41 or The threaded portion 72a (shown in FIG. 5) is screwed into a thread groove provided on the inner peripheral surface of the threaded portion 72a. At this time, the screw head is locked to the opening edge of the first screw threaded portion 533. Further, similarly to the internal heat exchanger 400 of the fourth example shown in FIG. 5, the joint portion 71 (shown in FIG. 5) and the refrigerant inlet/outlet portion 520 are fixed separately from the fixing member 140 (shown in FIG. 5). Fastened with member 150 (illustrated in FIG. 5).

An example of a procedure for removing the expansion device in the refrigeration cycle including the internal heat exchanger 500 of the fifth example will be described. First, the fixing member 140 (shown in FIG. 5) for fixing the expansion device connecting portion 530 and the expansion device 4 (shown in FIG. 5) is removed. Further, the fixing member 150 (shown in FIG. 5) that fixes the joint portion 71 (shown in FIG. 5) and the refrigerant inlet/outlet portion 520 is removed. Then, the expansion device 4 can be removed as in the case where the internal heat exchanger 400 of the fourth example is provided.

According to the internal heat exchanger 500 of the fifth example, the following effects can be obtained. Since the heat exchange section 510 is not included in the fastening target of the fixing member, it is possible to prevent the heat exchange section 510 from being deformed due to the fastening of the fixing member. Further, since the length of the fixing member can be shortened, the work from the engine room E side can be facilitated.

DESCRIPTION OF SYMBOLS 1 Refrigeration cycle 2 Compressor 3 Condenser 4 Expansion device 4a Element part 5 Evaporator 41 4th screw thread part 42,43 Flow path 61-65 of expansion device Piping 62a, 63a, 64a, 65a, 131a, 132a Fitting part 71,72 Joint part 71a 5th screw threaded part 72a 6th screw threaded part 91 Through hole 100,200,300,400,500 Internal heat exchanger 101,101a,101b,101c,101d Plate-shaped member 102 Plate-shaped member 102 Side 103 Opposite side of plate member 104 Side of plate member 105 Side opposite plate member 110, 210, 310, 410, 510 Heat exchange section 111 First heat exchange path 112 Second heat exchange path 113, 413 Grooves 113a, 213, 413a Third screw threaded parts 120, 420, 520 Refrigerant inlet/outlet part 121 First inflow path 122 First outflow path 123, 423, 523 Second screw threaded part 130, 530 Expansion device connecting part 131 Second inflow Path 132 Second outflow path 133,533 First screw threaded portion 133a Counterbore 140 Fixing member 141 Screw head 141a Hole 142 Screw shaft 142a Screw groove 150 Fixing member 151 Screw head 152 Screw shaft 210A, 210B Surface layer portion 210C Inner layer portions 214A, 214B Projection portion 215 First path 216 Second path 217 Space 313 Cylindrical cavity portion 535 Claw portion 534 Extension portion 800 First direction changing member 801 First connection path 802 Second connection path 810 First plate 811 1st connection path formation bulge part 811a, 811b 1st connection path formation bulge part end 812 2nd connection path formation bulge part 812a, 812b 2nd connection path formation bulge part 813 1st communicating port 814 2nd communicating port 815 One side of 1st plate 820 2nd plate 821 1st connection path formation bulging part 821a, 821b End part 822 of 1st connection path formation bulge part 2nd connection path Forming bulging portions 822a, 822b Second connecting path End portion 825 of forming bulging portion 825 Second side of plate 830 Intermediate plate 831 First notch 832 Second notch 900 Second direction changing member 901 Third connecting path 902 4th connecting path 910 1st plate 911 3rd connecting path forming bulging parts 911a, 911b Ends 911c, 922c of 3rd connecting path forming bulging part 912 4th connecting path forming bulging part 912a , 912b The end portion 913 of the fourth connection path forming bulge portion 913 Third communication port 914 Fourth communication port 9 15 One side 920 of the first plate 922 Second plate 921 End portion 922 of third connecting path forming bulging portion 921a, 921b Fourth connecting path forming bulging portion 922a, 922b Fourth End portion 925 of bulging portion for forming connection path 930 Second plate side 930 Intermediate plate 931 First notch 932 Second notch 933 Through hole D Dash panel E Engine room R cabin

Claims (3)

In an internal heat exchanger equipped in a refrigeration cycle of a vehicle air conditioner having a compressor, a condenser, an expansion device and an evaporator,
A first heat exchange path, which is configured by stacking plate-like members and through which the refrigerant guided from the condenser to the expansion device flows, and a second heat exchange path through which the refrigerant, which is guided from the evaporator to the compressor, flows. A heat exchange unit for exchanging heat of the refrigerant between
A refrigerant inlet/outlet part through which a first inflow path through which the refrigerant flows from the condenser to the first heat exchange path and a first outflow path through which the refrigerant flows from the second heat exchange path to the compressor flow,
An expansion device connection part through which a second outflow passage through which the refrigerant flows from the first heat exchange passage to the expansion device and a second inflow passage through which the refrigerant flows from the expansion device to the second heat exchange passage pass; ,,
The inflator connection has a first threaded portion,
The internal heat exchanger is detachably fixed to the expansion device by a fixing member having a screw head portion and a screw shaft portion,
The screw shaft portion is inserted into the first screw threaded portion and is also inserted into a fourth screw threaded portion provided in the expansion device,
The refrigerant inlet/outlet portion is fixed to the plate-shaped member arranged on the surface of one side of the heat exchange portion,
The expansion device connection portion is fixed to the plate-shaped member arranged on the surface of the other side of the heat exchange portion,
The heat exchange section has a third screw threaded portion at a position on the same straight line as the first screw threaded portion,
The third screw threaded portion is capable of inserting the fixing member,
The internal heat exchanger according to claim 1, wherein the screw shaft portion is inserted into the third screw passing portion, and the screw head portion is locked to an opening edge of the first screw passing portion. The first screw threaded portion has a spot facing portion at an end portion on the plate member side,
The internal heat exchanger according to claim 1, wherein the screw shaft portion is inserted into the first screw threaded portion, and the screw head portion is housed in the counterbore portion. A refrigeration cycle for a vehicle air conditioner comprising the internal heat exchanger according to claim 1.

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