JP2017089978A - Refrigerant pipe with silencer and refrigeration cycle of vehicular air conditioner including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerant pipe with a silencer enabling downsizing and securing vibration resistance and airtightness, and a refrigeration cycle of a vehicular air conditioner including the refrigerant pipe.SOLUTION: A refrigerant pipe 22 includes a silencer 40 and pipes 31, 34 inserted into the silencer 40, and the pipes 31, 34 are respectively inserted into pipe sockets 51, 61 of the silencer 40. Socket end parts 51a, 61a of the pipe sockets 51, 61 respectively facing to or contacting with the outer peripheral surfaces of the pipes 31, 34 are recessed on an internal space 40a side of the silencer, and the silencer 40 and the pipes 31, 34 are connected with brazing.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a refrigerant pipe having a silencer for reducing abnormal noise of a refrigerant and arranged in a vehicle air conditioner as part of a refrigeration cycle, and a refrigeration cycle including the same.

  The refrigeration cycle of a vehicle air conditioner has a configuration in which a compressor, a condenser, an expansion device, and an evaporator are connected by a refrigerant pipe, and the refrigerant circulates inside. At this time, abnormal noise may occur due to the flow of the refrigerant. Therefore, a technique of providing a silencer with an enlarged flow path cross-sectional area in a part of the refrigerant pipe is disclosed (for example, Patent Document 1 and Patent Document 2). As a result, abnormal noise components such as pulsation can be attenuated and transmission of abnormal noise can be suppressed.

  By the way, many parts of the refrigeration cycle of the vehicle air conditioner are arranged in the engine room. Many parts are arranged in the engine room, and the refrigerant pipe is arranged so as to bypass these parts. For this reason, downsizing of refrigerant piping including a silencer and improvement in the degree of freedom of layout are required.

  In this respect, the technique of Patent Document 1 has one of the two pipe receptacles of the cylindrical silencer formed on the bottom surface, so that the size of the silencer in the direction along the refrigerant flow can be reduced. Further, in the technique of Patent Document 2, the silencer can be further miniaturized because both of the two pipe receiving ports of the silencer are formed on the bottom surface substantially perpendicular to the direction of the refrigerant flowing through the refrigerant pipe. .

JP 2000-205701 A Shokai 59-043617

  However, the silencer and the refrigerant pipe of Patent Document 1 are formed in a portion extending in the direction along the flow of the refrigerant on the other side of the two pipe receptacles of the silencer. It has not been fully planned.

  In the silencer and the refrigerant pipe of Patent Document 2, the two pipe receiving ports of the silencer are both formed on the bottom surface, and the size is reduced in the direction along the flow of the refrigerant. . However, it is not disclosed how vibration resistance and airtightness are secured between the hole of the silencer and the pipe.

  Accordingly, the present invention provides a refrigerant pipe having a silencer whose size is reduced in the direction along the flow of the refrigerant, a refrigerant pipe ensuring vibration resistance and airtightness, and a refrigeration cycle for a vehicle air conditioner including the refrigerant pipe. The purpose is to do.

  The invention described in the first claim of the present application is the refrigerant pipes 20, 21, 22 used in the refrigeration cycle 2 of the vehicle air conditioner 1, when the reference numerals used in the examples are attached, and the inside is a refrigerant The two pipes 31 and 34 through which the refrigerant flows and a silencer 40 having two pipe receptacles into which the pipe has a larger flow passage cross-sectional area than the pipe and the pipe is inserted. The first bottom surface 50 has a first bottom surface 50 and a second bottom surface 60 which are substantially perpendicular to the direction of the refrigerant flowing through the inside of the silencer and spaced apart from each other. An opening 51 is formed, and the second bottom surface 60 is formed with a second pipe receiving port 61 out of two pipe receiving ports, and at least of the first pipe receiving port 51 and the second pipe receiving port 61 One face or contact with the outer peripheral surface of the pipe to be inserted Socket ends 51a, 61a is, is characterized in that recessed into the inner space 40a side of the silencer.

  Thereby, when the pipes 31 and 34 are inserted into the pipe receiving ports 51 and 61 of the silencer 40, the receiving end portion facing or contacting the outer peripheral surface of the pipe is recessed in the silencer. When brazing 31 and 34 and silencer 40, a brazing reservoir can be provided and the outer peripheral surface of a pipe and a silencer can be brazed firmly. And vibration resistance and airtightness can be ensured.

  Further, in the invention described in claim 2 of the present application, in the invention of the first claim, the first pipe receiving port 51 and the second pipe receiving port 61 are both outer peripheral surfaces of inserted pipes. The receiving end portions 51a and 61a that are opposed to or in contact with the concave portion are recessed toward the inner space 40a side of the silencer. In the refrigerant pipes 20, 21, and 22 where the silencer 40 is disposed in the middle of the refrigerant flow path, for example, when connecting two connection parts between the silencer 40 and the pipes 31 and 34, both connection parts are strong. Can be brazed.

  In the invention described in claim 3 of the present application, in the invention of claim 1 or claim 2, the space between the outer surface of the silencer and the outer peripheral surface of the pipe in the receiving end portion is It is a pool. After connecting the silencer 40 made of aluminum or aluminum alloy and the pipes 31 and 34 using the brazing material of aluminum alloy as in the following embodiment of the present invention, the brazing materials 52 and 62 function as structural members. Therefore, the pipes 31 and 34 are connected to the silencer 40 via the brazing materials 52 and 62, so that they can be firmly fixed.

  The invention described in claim 4 of the present application is any one of the inventions of the first to third claims, wherein the first bottom surface 50 and the second bottom surface 60 are non-parallel. It is said. As a result, when the two pipes 31, 34 are to be bent in a desired direction, the angle between the first bottom surface 50 and the second bottom surface 60 is set to the desired bending direction, thereby realizing a compact bending shape. can do.

  Further, in the invention described in claim 5 of the present application, in any of the inventions of the first to fourth claims, the two pipes 31 and 34 and the silencer 40 are made of aluminum or an aluminum alloy. It is characterized by that. It is easy to process and can be brazed.

  In the sixth aspect of the present invention, the refrigerant pipes 20, 21, and 22 described in any of the first to fifth aspects of the invention are connected to the refrigeration cycle of the vehicle air conditioner 1. It is characterized by being applied to 2. It is possible to provide a refrigeration cycle 2 that is reduced in size while having vibration resistance and airtightness.

  As described above, according to the present invention, it is possible to provide a refrigerant pipe that ensures not only miniaturization but also vibration resistance and airtightness. In addition, it is possible to provide a refrigeration cycle that is downsized while having vibration resistance and airtightness.

It is the schematic which shows an example of the refrigerating cycle of the vehicle air conditioner which concerns on this embodiment. It is a schematic perspective view which shows a part of refrigeration cycle of the vehicle air conditioner which concerns on this embodiment. It is a schematic sectional drawing of the silencer and its peripheral component which concern on Example 1. FIG. It is a schematic sectional drawing of the silencer which concerns on Example 2, and its peripheral components. It is a schematic sectional drawing explaining the manufacturing process of the silencer which concerns on Example 1. FIG. It is a schematic sectional drawing of the silencer which concerns on a comparative example with this embodiment, and its peripheral components.

  Embodiments of the present invention will be described below 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 drawings, the same reference numerals denote the same components. Various modifications may be made as long as the effects of the present invention are achieved.

  As shown in FIG. 1, the vehicle air conditioner 1 according to this embodiment is mounted on a vehicle (not shown), and includes a refrigeration cycle 2 and an air conditioning unit 3. The vehicle is partitioned by a partition plate P into an engine room 500 in which an engine (not shown) is arranged and a vehicle room 600 in which a passenger is boarded.

In the refrigeration cycle 2, a compressor 10, a condenser 11, an expansion device 12, and an evaporator 13 are appropriately connected through refrigerant pipes 20, 21, and 22. The compressor 10 is appropriately driven by an engine (not shown) or an electric motor to suck and discharge the refrigerant in the refrigeration cycle 2 and circulate. The refrigeration cycle 3 is disposed across the engine room 500 and the vehicle compartment 600. Specifically, a refrigerant pipe 21 connecting the condenser 11 to the expansion device 12 and a refrigerant pipe 22 connecting the evaporator 13 to the compressor 10 penetrate the partition plate P, and the compressor 10 , The condenser 11, the refrigerant pipe 20 connecting the compressor to the condenser, a part of the refrigerant pipe 21, and a part of the refrigerant pipe 22, a part of the refrigerant pipe 21, the expansion A part of the device 12, the evaporator 13, and the refrigerant pipe 22 are disposed on the vehicle interior 600 side.
In addition, although not shown in figure, the structure which connects between the downstream from the expansion apparatus 12 to the condenser 13 or between the downstream of the condenser 13 and the expansion apparatus 12 may be sufficient as refrigerant | coolant piping. In this case, the refrigerant pipe 22 connects between the expansion device 12 and the compressor 10.

  The air conditioning unit 3 is disposed inside the passenger compartment 600 and is formed downstream of the case 101, the blower 102 disposed inside the case 101, the evaporator 13 disposed downstream of the blower 102, and the evaporator 13. The outlets 103a, 103b, 103c are provided. Even if a known heat exchanger (not shown) for heating is disposed downstream of the evaporator 13. The blower 102 sucks and blows air in the passenger compartment 600 and / or air outside the vehicle selected as appropriate, and the blown air passes through the evaporator 13 and the air that passes through the evaporator 13 is blown out by the blower outlet 103a. , 103b, 103c are blown out toward the passenger compartment 600. At this time, if the refrigeration cycle 2 is operating, when the blown air passes through the evaporator 13, it is cooled and dehumidified.

  It is known that the compressor 10 may cause pulsation, which is one of the causes of abnormal noise, when the refrigerant inside the refrigeration cycle 2 is sucked and discharged. When the pulsation occurs, the sound component may propagate through the refrigerant and the refrigerant pipe 22 to reach the air conditioning unit 3 and may be propagated to the passenger in the passenger compartment 600.

  Therefore, as shown in FIG. 2, a technique is known in which a refrigerant pipe 22 connected to the upstream side of the compressor 10 is provided with a silencer 40 for suppressing propagation of pulsation. FIG. 2 is a schematic perspective view showing a part of the refrigeration cycle of the vehicle air conditioner according to the present embodiment. The compressor 10, the refrigerant pipe 20 through which the refrigerant discharged from the compressor 10 flows, and the compressor 10 sucks. The refrigerant | coolant piping 22 through which the refrigerant | coolant to flow through is shown. The refrigerant pipe 22 includes a pipe 31 and a pipe 34 through which the refrigerant flows, a silencer 40 having a larger refrigerant flow path cross-sectional area than the pipes 31 and 34 into which the pipes 31 and 34 are inserted, and a flexible rubber hose. 33, a caulking portion 32 that connects the pipe 31 and the rubber hose 33, and a connector 35 that enables the tip of the pipe 34 to be attached to the compressor 10. The pipe 31, the crimping part 32, the pipe 34, the connector 35, and the silencer 40 are made of metal such as aluminum or aluminum alloy. In addition, although the silencer 40 is shown as a cylindrical shape in FIG. 2, the silencer 40 is not necessarily limited thereto, and may be a prism such as a quadrangular prism, or an oblique prism. Moreover, although the silencer 40 showed the example provided in the refrigerant | coolant piping 22 connected to the upstream of the compressor 10 in this Example, it connects between the compressor 10 and the condenser 11 as needed. You may provide in the refrigerant | coolant piping 20 and the refrigerant | coolant piping 21 which connects between the condenser 11 and the expansion apparatus 12.

  By the way, in the engine room 500 in which the compressor 10 and the silencer 40 are arranged, various devices are arranged, and the refrigerant pipes 20, 21, and 22 are also required to have a high degree of design freedom regarding the layout. The silencer 40 and the vicinity thereof are no exception, and there is a demand for miniaturization and bending shapes.

<Comparative example>
Before describing the embodiment of the present invention, a comparative example is shown. FIG. 6 is a schematic cross-sectional view of a silencer 140 and its peripheral parts according to a comparative example with the present embodiment, and shows a peripheral structure in a conventional silencer suggested by Patent Document 2, in which the evaporator 13, the compressor 10, A part of the refrigerant pipe 122 for connecting is shown. The refrigerant pipe 122 of the comparative example includes pipes 31 and 34, and a silencer 140 having pipe receiving ports 151 and 161 into which the flow path cross-sectional area is larger than those of the pipes 31 and 34, and the pipes 151 and 161 are inserted. The silencer 140 has a first bottom surface 150 and a second bottom surface 160 that are substantially perpendicular to the direction 141a of the refrigerant flowing through the inside of the silencer and spaced apart from each other. The first bottom surface 150 is a first pipe receiving port 151. The second bottom surface 160 is formed with a second pipe receiving port 161, and the receiving end 151 a that faces or contacts the outer peripheral surface of the inserted pipe 31 is flush with the first bottom surface 150. The receiving end portion 161 a that faces or contacts the outer peripheral surface of the inserted pipe 34 is on the same plane as the first bottom surface 160. After the pipe 31 is inserted into the first pipe receiving port 151, it is brazed and fixed to the silencer 140. After the pipe 34 is inserted into the second pipe receiving port 161, it is brazed and fixed to the silencer 140.

  The flow of the refrigerant flowing through the inside of the refrigerant pipe 122 downstream from the rubber hose 33 will be described. The refrigerant that has flowed through the pipe 31 as indicated by the arrow 31a reaches the internal space 140a of the silencer 140 and flows through the internal space 140a as a main flow 141a, a substream 141b, and 141c. Then, the main flow 141a and the substreams 141d and 141e are sucked into the pipe 34 and flow toward the compressor 10 as indicated by an arrow 34a. Even if pulsation occurs in the compressor 10 and propagates to the flow of the arrow 34 a, the inner space 140 a of the silencer 140 has a constant volume, and the flow path cross-sectional area is relatively relative to the pipe 34. Since it is large, the flow velocity is also slow, so that the propagation of pulsation can be suppressed with respect to the refrigerant flow indicated by the arrow 31a.

  In the silencer 140, the dimension L0 of the portion having a large flow path cross-sectional area is the dimension of the silencer 140 in the refrigerant flow direction, and the shape in which the size is reduced while obtaining the pulsation suppressing effect is obtained. It has become.

  Here, the pipe 31 and the silencer 140 are merely connected by brazing performed in the range of the plate thickness of the silencer 140 at the first pipe receiving port 151. Since the surface area to be brazed is small (narrow) in this way, the reliability with respect to airtightness and pressure resistance is not high. In addition, even when an external force is applied to the pipe 31, since the surface area to be brazed is small, the reliability with respect to vibration resistance is not high.

  Similarly, the pipe 34 and the silencer 140 are only connected by brazing performed in the range of the thickness of the silencer 140 at the second pipe receiving port 161. Since the surface area to be brazed is small, the reliability with respect to vibration resistance, airtightness and pressure resistance is not high.

<Example 1>
Subsequently, an embodiment of the present invention will be described. FIG. 3 shows Example 1 of the present embodiment and is a schematic cross-sectional view of the silencer 40 and its peripheral components. A part of the refrigerant pipe 22 connecting the evaporator 13 and the compressor 10 is shown. The refrigerant pipe 22 according to the first embodiment includes pipes 31 and 34 and a silencer 40 having pipe receiving ports 51 and 61 into which the pipes 31 and 34 are inserted. The silencer 40 includes a first bottom surface 50 and a second bottom surface 60 that are substantially perpendicular to the direction 41a of the refrigerant flowing through the silencer and spaced apart from each other. The first bottom surface 50 is a first pipe receiving port. 51 is formed, the second bottom surface 60 is formed with a second pipe receiving port 61, and the receiving end 51 a that faces or contacts the outer peripheral surface of the pipe 31 to be inserted is silencer 40 with respect to the first bottom surface 50. The receiving end 61a that is indented or in contact with the outer peripheral surface of the pipe 34 to be inserted is located inside the silencer 40 (with respect to the inner space 40a). Side) And Nde. After the pipe 31 is inserted into the first pipe receiving port 51, it is brazed and fixed to the silencer 40. After the pipe 34 is inserted into the second pipe receiving port 61, it is brazed and fixed to the silencer 40.

  The flow of the refrigerant flowing through the refrigerant pipe 22 downstream from the rubber hose 33 will be described. The refrigerant that has flowed through the pipe 31 as indicated by the arrow 31a reaches the internal space 40a of the silencer 40, and flows through the internal space 40a as a main flow 41a and side flows 41b and 41c. Then, the main flow 41a and the substreams 41d and 41e are sucked into the pipe 34 and flow toward the compressor 10 as indicated by an arrow 34a. Even if pulsation occurs in the compressor 10 and propagates to the flow of the arrow 34 a, the inner space 40 a of the silencer 40 has a constant volume, and the flow path cross-sectional area is relative to the pipe 34. Since it is large, the flow velocity is also slow, so that the propagation of pulsation can be suppressed with respect to the refrigerant flow indicated by the arrow 31a.

  The silencer 40 also has a dimension L1 having a large flow path cross-sectional area, which is the dimension of the silencer 40 in the refrigerant flow direction. It has become.

  Here, the pipe 31 and the silencer 40 are not only the thickness of the silencer 40 in the first pipe receiving port 51 but also the portion where the receiving end 51a is recessed in the silencer 40 (inside the internal space 40a). The brazing material 52 to be stored is also connected. Since the surface area to be brazed is large (wide) in this way, the reliability with respect to airtightness and pressure resistance can be increased. In addition, even when an external force is applied to the pipe 31, since the surface area to be brazed is large, the reliability with respect to vibration resistance can be increased.

  Similarly, the pipe 34 and the silencer 40 are recessed not only in the plate thickness range of the silencer 40 in the second pipe receiving port 61 but also in the inside of the silencer 40 (on the inner space 40a side). The brazing material 62 stored in the portion is also connected. Therefore, the surface area to be brazed is large, and the reliability with respect to vibration resistance, airtightness and pressure resistance can be increased.

<Manufacturing method>
Next, the manufacturing method of a silencer is shown using FIG. FIG. 5 is a schematic cross-sectional view illustrating the manufacturing process of the silencer 40 according to the first embodiment.

  First, the raw material is plastically processed by a forging process, and as shown in FIG. 5A, for example, a bottomed cylindrical body is formed. The side surface 42 is not limited to a circular cross section, and may be a polygon or an ellipse. The bottomed surface is the first bottom surface 50.

  Next, a part of the first bottom surface 50 is pressed to form a first pipe receiving port 51 and a receiving end 51a as shown in FIG. The first pipe receiving port 51 is formed by removing the surplus portion 53. The receiving end 51a is bent toward the inner space 40a. Here, the diameter of the first pipe receiving port 51 is preferably slightly smaller than the diameter of the pipe 31. In the later process, when the pipe 31 and the silencer 40 are connected by brazing, it is easy to ensure airtightness. Even if the diameter of the first pipe receiving port 51 is slightly smaller than the diameter of the pipe 31, the receiving end 51a bent toward the inner space 40a can be elastically deformed and inserted.

  Next, as shown in FIG. 5 (c), the open portion on the opposite side of the first bottom surface 50 is deformed using the aperture die 80, and the second bottom portion 60 and the aperture portion 63 are replaced. Form.

  Subsequently, as shown in FIG. 5 (d), the throttle part 63 protruding outward from the second bottom part 60 is cut. Note that the diameter of the hole 64 formed by cutting the throttle 63 is set to be sufficiently smaller than the diameter of the pipe 34.

  Furthermore, as shown in FIG. 5E, the second pipe receiving port 61 and the receiving end 61a are formed using the forming jig 81. The receiving end 61a is bent toward the inner space 40a. Here, it is desirable that the diameter of the second pipe receiving port 61 is slightly smaller than the diameter of the pipe 34. In a later step, when the pipe 34 and the silencer 40 are connected by brazing, it is easy to ensure airtightness. Even if the diameter of the second pipe receiving opening 61 is slightly smaller than the diameter of the pipe 34, the receiving end 61a bent toward the inner space 40a can be elastically deformed and inserted.

  The silencer 40 can be manufactured by the manufacturing method as described above.

  Thereafter, the pipe 31 is inserted into the first pipe receiving port 51, the pipe 34 is inserted into the second pipe receiving port 61, and the inserted portions are brazed, and the pipes 31, 34 and the silencer 40 are inserted. And join.

<Other manufacturing methods>
In FIG. 5, the silencer manufacturing method in which the second bottom surface 60 is parallel to the first bottom surface 50 is shown, but when the second bottom surface 60 is formed by the drawing die 80, it does not seem to be parallel to the first bottom surface 50. The silencer 40 of Example 2 can be shape | molded by processing a cylindrical body.

  FIG. 5 shows a method for forming the first pipe receiving port 51 and the receiving end 51a by press working, but in the same way as the processing method for the second pipe receiving port 61 and the receiving end 61a. Alternatively, the drawing die 80 or the forming jig 81 may be used for processing. Production equipment to be prepared can be reduced by reducing the pressing process and using the same jig at a plurality of locations.

  Since the brazing material 52 is an aluminum alloy, it not only joins the silencer 40 and the pipes 31 and 34 but also functions as a structural member after joining. Since the brazing filler metal 52 can be stored in the receiving end portions 51 a and 61 a recessed inside the silencer 40, the pipes 31 and 34 are connected to the silencer 40 by a material thicker than the plate thickness of the first bottom portion 50 and the second bottom portion 60. Is supposed to be fixed firmly.

<Example 2>
FIG. 4 shows Example 2 of the present embodiment, and is a schematic cross-sectional view of the silencer 40 and its peripheral components. The difference from the first embodiment is that the second bottom surface 60 ′ is not parallel to the first bottom surface 50. The refrigerant that has flowed through the refrigerant pipe 22 downstream of the rubber hose 33 is divided into a main flow 41a and substreams 41b and 41c in the same manner as in the first embodiment, and flows through the silencer 40. The main flow 41a and the substream 41d ′, 41e 'is sucked into the pipe 34 and flows toward the compressor 10 as indicated by an arrow 34a. The second bottom surface 60 ′ is not parallel to the first bottom surface 50, but is formed as a surface that is substantially perpendicular to the main flow 41 a. In the silencer 40 of the second embodiment, the size L2 of the portion having a large flow path cross-sectional area is the size of the silencer 40 in the refrigerant flow direction, and the size can be reduced while obtaining the effect of suppressing pulsation. It has the shape shown. In addition, since the receiving end portions 51a and 61a are recessed in the silencer 40 (on the side of the internal space 40a), the surface area to be brazed is large, and the reliability with respect to vibration resistance, airtightness and pressure resistance can be improved. it can.

  In the second embodiment, since the second bottom surface 60 ′ is not parallel (not parallel) to the first bottom surface 50, the pipe 34 can be arranged in a direction different from the axial direction of the pipe 31. It is possible. For this reason, when employ | adopting the layout which bends the refrigerant | coolant piping 22 in the vicinity of the silencer 40, it can reduce in size.

  Up to this point, an example in which both the receiving end 51a and the receiving end 61a are recessed toward the inner space 40a has been shown, but depending on the implementation situation, only one of the receiving ends 51a It may be recessed toward the inner space 40a.

DESCRIPTION OF SYMBOLS 1 Vehicle air conditioner 2 Refrigeration cycle 3 Air conditioning unit 10 Compressor 11 Condenser 12 Expander 13 Evaporator 20 Refrigerant piping (refrigerant piping connecting between compressor and condenser)
21 Refrigerant piping (refrigerant piping connecting the condenser to the expansion device)
22 Refrigerant piping (refrigerant piping connecting between the evaporator and the compressor, or refrigerant piping connecting between the expansion device and the compressor)
31 Pipe 31a Arrow (flow of refrigerant)
32 Caulking part 33 Rubber hose 34 Pipe 34a Arrow (flow of refrigerant)
35 Connector 40 Silencer 40a Internal space 41a Main flow 41b, 41c, 41d, 41e Subflow 41d ', 41e' Subflow 42 Side surface 50 First bottom surface 51 First pipe receiving port 51a Receiving end 52 Brazing material 53 Surplus portion 60 Second bottom surface 60 ′ Second bottom surface 61 Second pipe receiving port 61a Receiving end portion 62 Brazing material 63 Restriction portion 64 Hole portion 80 Drawing die 81 Molding jig 101 Case 102 Blower 103a, 103b, 103c Outlet 122 Refrigerant piping (From the refrigerant pipe connecting the evaporator to the compressor or from the expansion device
Refrigerant piping connecting between the compressor)
140 Silencer 140a Internal space 141a Main flow 141b, 141c, 141d, 141e Subflow 141d ', 141e' Subflow 142 Side surface 150 First bottom surface 151 First pipe receiving port 151a Receiving end portion 160 Second bottom surface 160 'Second bottom surface 161 Second pipe receiving port 161a Reception end 500 Engine room 600 Car compartment P Partition plate

Claims (6)

A refrigerant pipe used for a refrigeration cycle of a vehicle air conditioner,
Two pipes through which refrigerant flows,
A silencer having two pipe receiving ports into which the pipe has a larger flow passage cross-sectional area than the pipe and the pipe is inserted;
The silencer has a first bottom surface and a second bottom surface that are substantially perpendicular to the direction of the refrigerant flowing through the silencer and spaced apart from each other.
The first bottom surface is formed with a first pipe receptacle among the two pipe receptacles,
The second bottom surface is formed with a second pipe receptacle among the two pipe receptacles,
At least one of the first pipe receiving port and the second pipe receiving port has a receiving end that faces or contacts the outer peripheral surface of the inserted pipe, and is recessed toward the inner space side of the silencer. Refrigerant piping characterized by Each of the first pipe receiving port and the second pipe receiving port has a receiving end that faces or contacts the outer peripheral surface of the inserted pipe, and is recessed toward the inner space side of the silencer. The refrigerant pipe according to claim 1. The refrigerant pipe according to claim 1 or 2, wherein a portion of the receiving end portion between the outside of the silencer and the outer peripheral surface of the pipe is a wax pool. The refrigerant piping according to any one of claims 1 to 3, wherein the first bottom surface and the second bottom surface are non-parallel. The refrigerant pipe according to any one of claims 1 to 4, wherein the two pipes and the silencer are made of aluminum or an aluminum alloy.   A refrigeration cycle for a vehicle air conditioner comprising the refrigerant pipe according to any one of claims 1 to 5.

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