JP2005207463A - Connecting structure of passages - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a passage connecting structure of blocks to each other capable of suppressing the cost using a simple constitution. <P>SOLUTION: When the passages (outlet 19 and connection hole 22) of a liquid tank 3 and a double pipe fitting block 14 to be coupled together are connected with each other, the connecting pipe parts 25a and 25b at the ends of a pipe fitting 25 having a flange part 25c at the periphery of the middle part in the longitudinal direction are pinched by the joining surfaces 3a and 14a of the liquid tank 3 and the double pipe fitting block 14 in the condition that they are inserted through an O-ring 100 to the open end of each passage and the flange part 25c is accommodated in a ring-shaped recess 22b provided in each block. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a passage connection structure applied to a location where a refrigerant passage of a vehicle air conditioner is connected to an expansion valve.

Conventionally, when the paths provided in two blocks to be coupled to each other are connected to each other, the path end of one block is cut into a male shape and the path end of the other block is cut into a female shape. Both passages are connected to each other by fitting a die passage end and a female die passage end (see, for example, Patent Document 1). Moreover, there exists what substitutes a male type | mold with the protrusion end of the pipe penetrated to the block (for example, refer patent document 2).
Japanese Utility Model Publication No.4-2383 (FIG. 6) Japanese Patent Laid-Open No. 9-229262

  However, in the case where a male die is directly processed into a block by conventional cutting, there is a problem that the processing cost increases. Further, in the case where the projecting end of the pipe is replaced with a male type, there is a problem that the processing load when the pipe is fixed through is large, and the cost is also increased.

  In view of the above circumstances, an object of the present invention is to provide a passage connection structure between blocks that can reduce the cost with a simpler configuration.

  The invention according to claim 1 is a structure in which passages provided in two blocks to be coupled to each other are connected to each other, and connecting pipe portions at both ends of a pipe joint having flange portions on the outer periphery of the intermediate portion in the length direction. Are inserted into the opening ends of the passages of the respective blocks through a sealing material, and the flange portion is fixed between the blocks or to any one of the blocks.

  A second aspect of the invention is the passage connection structure according to the first aspect, wherein the flange portion is sandwiched between the mating surfaces of the blocks.

  The invention according to claim 3 is the passage connection structure according to claim 2, wherein an annular receiving recess is provided at an opening end of the passage of one of the blocks, and the annular receiving recess is provided with the annular receiving recess. The flange part is accommodated and the flange part is clamped between the mating surfaces of both blocks by joining both blocks in that state.

  A fourth aspect of the invention is the passage connection structure according to the first aspect, wherein the flange portion is fixed by caulking to one of the blocks.

  Invention of Claim 5 is the connection structure of the channel | path of Claim 4, Comprising: The cyclic | annular accommodation recessed part was provided in the opening end of the channel | path of one of the said blocks, and the said cyclic | annular accommodation recessed part has the said The flange part is accommodated, and the flange part is caulked and fixed by cutting the peripheral wall part of the accommodating recess in a thin shape from the outer peripheral side in this state and bending it inwardly.

  According to the first aspect of the present invention, since the passages of both blocks are connected using independent pipe joints, it is not necessary to perform troublesome processing on each block, and the cost can be reduced. Moreover, since the pipe joint with a flange is used, it can fix reliably and the workability | operativity at the time of a connection is also good.

  According to invention of Claim 2, since a flange part is clamped between the mating surfaces of both blocks, a pipe joint can be reliably hold | maintained without backlash only by couple | bonding blocks.

  According to the invention of claim 3, the flange portion is sandwiched between the mating surfaces by joining both blocks in a state in which the flange portion is accommodated in the annular accommodating recess formed in one block, so that the mating surfaces are in close contact with each other The pipe joint can be securely held without rattling.

  According to the invention of claim 4, since the flange portion is fixed by caulking to any of the blocks, the workability at the time of connection is good, and the pipe joint can be securely held without rattling.

  According to the invention of claim 5, in a state where the flange portion is accommodated in the annular accommodating recess formed in one block, the peripheral wall portion of the accommodating recess is cut into a thin shape from its outer peripheral side and bent inwardly. Since the flange portion is swaged and fixed, the pipe joint can be swaged and fixed effectively using the elements in the housing recess while minimizing troublesome cutting.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view showing a state before connection of the connection structure of the embodiment. This connection structure is applied to a connection portion between the liquid tank 3 and the pipe in the refrigeration cycle of the vehicle air conditioner. What is indicated by reference numeral 14 is a double pipe joint block. Here, the liquid tank 3 and the double pipe joint block 14 correspond to two blocks to be coupled to each other.

  In the following description, the entire system to which the connection structure of the embodiment is applied will be described first, and then the details of the part to which the connection structure of the embodiment is applied will be described. 2 is a schematic configuration diagram of the refrigeration cycle of the vehicle air conditioner, FIG. 3 is an exploded perspective view of a pipe connection structure of the refrigeration cycle, and FIG.

  In the refrigeration cycle of this vehicle air conditioner, the high-temperature and high-pressure gas refrigerant compressed by the compressor 1 is heat-exchanged with the outside air by the condenser 2 to obtain a high-pressure liquid refrigerant or gas-liquid mixed refrigerant, and is separated into gas and liquid by the liquid tank 3. After that, it is adiabatically expanded by an expansion valve 4 as expansion means to form a low-temperature and low-pressure liquid refrigerant or gas-liquid mixed refrigerant, and heat is exchanged with air in the passenger compartment by an evaporator 5 to obtain a low-pressure gas refrigerant, and then returned to the compressor 1. I am doing so.

  In order to prevent the vibration and pulsation of the compressor 1 driven by an unillustrated engine from being transmitted to the condenser 2 and the evaporator 5, the compressor 1 is connected in communication with the condenser 2 and the evaporator 5 via the flexible hose 6.

  The capacitor 2 is integrated with a radiator (not shown) and is elastically supported outside the passenger compartment. As shown in FIG. 3, the capacitor 2 includes a large number of flat tubes 8, 8,... Arranged in parallel between a pair of header tubes 7, 7 (only one is shown) arranged opposite to each other. Both ends are connected to the header tube 7 in communication, and heat transfer fins (not shown) are interposed between the flat tubes 8 and 8.

  The liquid tank 3 is connected in communication with the capacitor 2 via the pipe 9 and is disposed at a position away from the capacitor 2. By separating the liquid tank 3 from the capacitor 2 in this manner, the liquid tank 3 does not get in the way when the capacitor 2 is mounted on the vehicle, so that the mountability is improved.

  A double pipe 11 is connected to the expansion valve 4 and the evaporator 5 via a joint 10. The double tube 11 is made of a metal having good thermal conductivity, and includes an outer tube 12 and an inner tube 13 inserted therein. One end of each of the outer pipe 12 and the inner pipe 13 is brazed to the double pipe joint block 14.

  One end of the inner pipe 13 is connected to the outlet of the liquid tank 3 through the double pipe joint block 14, and the other end of the inner pipe 13 is connected to the inlet of the expansion valve 4 through the joint 10. On the other hand, one end of the outer tube 12 is connected to the inlet of the compressor 1 via the pipe 16, and the other end of the outer tube 12 is connected to the outlet of the evaporator 5 via the joint 10.

  The refrigerant discharged from the liquid tank 3 is supplied to the expansion valve 4 through the inner pipe 13 and adiabatically expands here. Then, it evaporates by the evaporator 5 and returns to the compressor 1 through the outer pipe 12. At this time, heat exchange with the refrigerant passing through the inner pipe 13 is performed.

  As a result, the high-pressure refrigerant passing through the inner pipe 13 is supercooled and a predetermined subcooling is achieved, so that the refrigerant cycle is stabilized and the heat exchange efficiency in the evaporator 5 is improved. On the other hand, since the low-pressure refrigerant passing through the outer pipe 12 is heated, power consumption in the compressor 1 can be reduced.

  If the refrigerant before the inlet of the liquid tank 3 is subcooled to take a subcool, the liquid tank 3 will be full, so it will be necessary to enclose excess refrigerant. Then, since the subcooling is performed for the refrigerant discharged from the liquid tank 3, such a need is not required.

  Also, the refrigerant flow path from the outlet of the liquid tank 3 to the inlet of the expansion valve 4 and a part of the refrigerant flow path from the outlet of the evaporator 5 to the inlet of the compressor 1 are configured by a single double pipe 11. Thus, there is an advantage that the piping structure in the engine room is simplified. Note that only a part of the refrigerant flow path from the outlet of the liquid tank 3 to the inlet of the expansion valve 4 may be constituted by a double pipe, or the whole may be constituted by a double pipe.

  In this way, heat exchange is performed in the double pipe portion, and the high-pressure refrigerant passing through the inner pipe 13 is supercooled to obtain a predetermined subcool, so that it is not necessary to provide a subcool portion integrally with the capacitor portion. Since the size can be increased, the heat dissipation performance of the capacitor can be improved.

  Next, a connection structure using the double pipe joint block 14 which is a characteristic point of the present embodiment will be described.

  The double pipe joint block 14 is a block-like joint for branching the flow paths of the inner pipe 13 and the outer pipe 12 of the double pipe 11 toward the outlet of the liquid tank 3 and the inlet of the compressor 1. That is, as shown in FIG. 1, the double pipe joint block 14 includes a connection port 21 to which the double pipe is brazed, a connection port 22 to be connected to the liquid tank outlet, and a pipe on the compressor inlet side. Are connected to each other, and each flow path of the double pipe 11 connected to the double pipe connection port 21 is branched into the connection port 22 and the connection port 23 in the inside thereof. And a branch passage 20 for.

  A large-diameter portion 22a is provided on the opening side of the connection port 22 of the double pipe joint block 14, and an annular accommodating recess 22b is provided at the open end of the large-diameter portion 22a. A flanged pipe joint 25 is used to connect the connection port 22 and the outlet 19 of the liquid tank 3 (corresponding to a passage in the liquid tank).

  The flanged pipe joint 25 has both ends in the length direction as connection pipe portions 25a and 25b, and has a flange portion 25c on the outer periphery of the intermediate portion in the longitudinal direction. The outer periphery of the connection pipe portions 25a and 25b An O-ring (seal member) 100 is attached in advance. The pipe joint 25 may be manufactured by cutting or the like, but may be manufactured by pressing the pipe wall of the pipe into a flange shape as shown in FIG. Then, one connecting pipe portion 25a is inserted into the large diameter portion 22a of the connection port 22 via the O-ring 100, and the flange portion 25c is accommodated in the annular accommodating recess 22b of the double pipe joint block 14, thereby A joint 25 is attached to the double pipe joint block 14.

  In this state, the other connecting pipe portion 25b of the pipe joint 25 protrudes from the joint surface (mating surface) 14a with the liquid tank 3 toward the liquid tank 3, and this protruding portion functions as a male connecting portion. .

  The double pipe joint block 14 is provided with a U-shaped opening 26 into which the pipe 9 connecting the outlet of the capacitor 2 and the inlet 18 of the liquid tank 3 can be inserted from the radial direction. Receiving recess for receiving the flange portion 9b on the proximal end side of the connecting portion 9a of the pipe 9 on the joint surface 14a of the double pipe joint block 14 with the liquid tank 3 in order to position the pipe 9 inserted into the opening 26 27.

  The pipe connection work with the double pipe joint block 14 configured as described above will be described below. First, as shown in FIG. 4, the pipe 9 is inserted into the U-shaped opening 26 of the double pipe joint block 14 to which the double pipe 11 is fixed by brazing.

  Next, the flange portion 9b of the pipe 9 inserted into the U-shaped opening 26 is disposed on the joint surface 14a of the double pipe joint block 14 with the liquid tank 3, and the pipe 9 is connected to the double pipe joint block 14. Temporarily fix to. At this time, the flange portion 9 b is accommodated in the accommodating recess 27 of the double pipe joint block 14 to restrict the pipe 9 from being displaced in the radial direction within the U-shaped opening 26. That is, the pipe 9 is positioned at a predetermined position in the U-shaped opening 26. In addition, an O-ring 100 is attached to the outer periphery of the tip of the pipe 9.

  Thereafter, the pipe 9 is connected to the liquid tank 3 inlet 18 in a state where the flange 9b of the pipe 9 and the flange 25c of the pipe joint 25 are sandwiched between the double pipe joint block 14 and the liquid tank 3, The connecting pipe portion 25b on the protruding side of the pipe joint 25 is connected to the liquid tank 3 outlet 19, and the double pipe joint block 14 is fastened to the liquid tank 3 with bolts (not shown).

  By doing so, the passage (exit 19) of the liquid tank 3 and the passage (connection port 22) of the double pipe joint block 14 can be connected to each other via the pipe joint 25. In this case, the coupling between the liquid tank 3 and the double pipe joint block 14 sandwiches the flange part 25c of the pipe joint 25 and the flange part 9b of the pipe 9 between the joint surfaces (mating surfaces) 3a and 14a thereof. The pipe joint 25 and the pipe 9 can be reliably held without rattling.

  Finally, the pipe 16 is connected to the connection port 23 of the double pipe joint block 14, and the flange portion 16 b of the pipe 16 is fastened to the double pipe joint block 14.

  By connecting in this way, there are the following effects.

  First, since the independent pipe joint 25 connected directly to the liquid tank 3 outlet 19 is attached to the connection port 22 of the double pipe joint block 14, the connection port 22 and the liquid tank 3 outlet 19 are connected. Therefore, it is not necessary to use piping, and therefore the number of parts is reduced and the manufacturing cost can be reduced.

  Second, by attaching an independent pipe joint 25 to the connection port 22 of the double pipe joint block 14, one of the pipe connections 25b of the pipe joint 25 itself can be made to function as a male-type connection part. Since it can be fitted to the outlet 19 of the tank 3, it is not necessary to perform troublesome processing such as providing a male convex portion on the double pipe joint block 14 itself by cutting, and the increase in cost can be suppressed as much as possible. it can.

  Thirdly, the pipe 9 connected to the liquid tank 3 inlet 18 is temporarily held in the U-shaped opening 26 of the double pipe joint block 14, and the pipe 9 is connected by fastening the double pipe joint block 14 to the liquid tank 3. Since the connection with the liquid tank 3 inlet 18 is fixed, the double pipe joint block 14 also functions as a mounting bracket for the pipe 9. Therefore, it is not necessary to prepare a mounting bracket separately, and the manufacturing cost can be further reduced as the number of parts is reduced.

  Fourthly, since the flange 9b of the pipe 9 and the flange 25c of the pipe joint 25 are positioned by the housing recesses 27 and 22b, the connection work of the pipe 9 and the mounting work of the pipe joint 25 are simplified, and the manufacturing cost is further reduced. Can be planned.

  In addition, in the said embodiment, although the flange part 25c of the pipe joint 25 was only accommodated in the accommodation recessed part 22b, the flange part 25c of the pipe joint 25 may be crimped and fixed to the double pipe joint block 14. .

  FIG. 6 shows an example. In this example, an annular housing recess 22c is provided at the open end of the large diameter portion 22a of the connection port 22 of the double pipe joint block 14, and the flange portion 25c of the pipe joint 25 is housed in the annular housing recess 22c. The flange portion 25c is caulked and fixed by cutting the peripheral wall portion 22d of the housing recess 22c into a thin-walled shape from the outer peripheral side and bending it inwardly.

  The peripheral wall portion 22d used for caulking may be a continuous annular shape or may be divided in the circumferential direction and provided at intervals. As a caulking method, the tip of a blade having an inclined surface portion for caulking is protruded on the end surface of the peripheral wall portion of the housing recess 22c, the blade edge is press-fitted as it is, and the peripheral wall portion 22d is brought inside the blade edge. A method of caulking the flange portion 25c by bending and deforming inwardly by the inclined surface portion of the blade edge at the same time while cutting into a thin wall can be employed.

  When the flange portion 25c is fixed by caulking in this way, the pipe joint 25 can be firmly fixed, so that the workability when the mating liquid tank 3 is coupled is improved. Further, by using the peripheral wall portion 22d of the housing recess 22c as a caulking piece in this way, the pipe joint 25 can be caulked and fixed effectively while minimizing troublesome cutting.

  Moreover, although the case where the pipe joint 25 was fixed to the double pipe joint block 14 side was shown in the said embodiment, you may fix to the liquid tank 3 side which is the other block, and do not fix to either. You may just pinch.

It is sectional drawing which shows the state before the connection of the connection structure of embodiment of this invention. It is a schematic block diagram of the refrigerating cycle of the vehicle air conditioner which has a connection part to which the connection structure of embodiment of this invention is applied. It is a disassembled perspective view of the piping connection structure of the said refrigerating cycle. It is a disassembled perspective view which shows the part to which the connection structure of embodiment of this invention was applied. It is sectional drawing which shows the example of formation of the flange part of the pipe joint used for embodiment of this invention. It is principal part sectional drawing of other embodiment of this invention.

Explanation of symbols

3 Liquid tank (block)
14 Double pipe joint block (block)
3a, 14a Joint surface (mating surface)
19 Exit (passage)
22 Connection port (passage)
22b, 22c accommodating recess 22d peripheral wall 25 pipe joint 25a, 25b connecting pipe 25c flange 100 O ring (seal material)

Claims (5)

In the structure in which the passages (19, 22) provided in the two blocks (3, 14) to be coupled to each other are connected to each other,
The connecting pipe parts (25a, 25b) at both ends of the pipe joint (25) having the flange part (25c) on the outer periphery of the intermediate part in the length direction are respectively connected to the passages (19, 22) of the respective blocks (3, 14). The flange portion (25c) is inserted between the blocks (3, 14) or any one of the blocks (3, 14) through the sealing material (100) at the open end. ) Is connected to the passage. The passage connection structure according to claim 1,
A connection structure for a passage, wherein the flange portion (25c) is sandwiched between the mating surfaces (3a, 14a) of the both blocks (3, 14). The passage connection structure according to claim 2,
An annular housing recess (22b) is provided at the open end of the passage (22) of one of the blocks (3, 14), and the flange portion (25c) is formed in the annular housing recess (22b). ), And in this state, the blocks (3, 14) are coupled to each other so that the flange portion (25c) is sandwiched between the mating surfaces (3a, 14a) of both blocks. . The passage connection structure according to claim 1,
A connecting structure for a passage, wherein the flange portion (25c) is caulked and fixed to any one of the blocks (3, 14). The passage connection structure according to claim 4,
An annular housing recess (22c) is provided at the open end of the passage (22) of one of the blocks (3, 14), and the flange portion (25c) is provided in the annular housing recess (22c). ), And in this state, the flange portion (25c) is fixed by crimping by cutting the peripheral wall portion (22d) of the storage recess (22c) into a thin shape from its outer peripheral side and bending it inwardly. A passage connection structure.

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