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Pipe joint

A technology of pipe joints and connections, applied in the field of pipe joints, can solve problems such as global warming and ozone layer destruction

Inactive Publication Date: 2009-09-16
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in recent years, freon gas, which is often used as a refrigerant in refrigeration equipment, has become a major cause of damage such as the destruction of the ozone layer and global warming when it is discharged into the atmosphere.

Method used

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Experimental program
Comparison scheme
Effect test

no. 1 approach

[0035] Below, refer to Figure 1 ~ Figure 4 The first embodiment in which the present invention is embodied as a pipe joint will be described. figure 1 It is a partial cross-sectional view showing the structure of the pipe joint 1. The pipe joint 1 is a bite-in joint for connecting refrigerant pipes of, for example, a refrigeration device or a heat pump water heating device, and includes a joint body 11 connected to the pipe 10, and a screwing member screwed to the joint body 11 Nut 12. The tip portion 10a of the pipe 10 to be connected is inserted into the pipe connection port 11a provided at one end portion of the joint body 11 in the axial direction.

[0036] The pipe joint 1 includes an annular ferrule 13 that bites into the outer peripheral surface of the pipe when the pipe is connected. The ferrule 13 is integrally provided with the nut 12 before the pipe 10 is connected, and the nut 12 is screwed to the joint body 11 to be disconnected and separated from the nut 12. The fro...

no. 2 approach

[0063] Below, refer to Figure 5 (a)~ Figure 6 (d) The second embodiment in which the present invention is embodied as a pipe joint will be described. In the second to fourth embodiments described below, only the coupling form between the gripping part and the screw part constituting the nut is different from the first embodiment, and the structure of the joint body and the nut for connecting the piping is different from that of the first embodiment. The implementation is the same. Therefore, in the second embodiment to the fourth embodiment described below, the description of the same structure as the first embodiment is omitted or simplified.

[0064] The pipe joint 2 according to the second embodiment includes a joint main body 21 into which the pipe 10 is inserted, and a nut 22 as a tightening member screwed to the joint main body 21. The joint main body 21 has the same shape as the joint main body 11 according to the first embodiment. The nut 22 includes a screw part 24 that...

no. 3 approach

[0079] Below, refer to Figure 7 (a)~ Figure 8 (d) A description will be given of a third embodiment in which the present invention is embodied as a pipe joint. The pipe joint 3 according to the third embodiment includes a joint main body 31 into which the pipe 10 is inserted, and a nut 32 as a tightening member screwed to the joint main body 31. The joint main body 31 has the same shape as the joint main body 11 according to the first embodiment. The nut 32 includes a screw part 34 that is screwed to the joint body 31 to connect the pipe 10 to the joint body 31 and a grip part 35 that is held by a tightening tool such as a wrench when the nut 32 is screwed.

[0080] Figure 7 (a)~ Figure 7 (c) is a partial cross-sectional view showing the structure of the nut 32. Such as Figure 7 As shown in (a), before the connection operation of the pipe 10, the screw part 34 and the holding part 35 are coupled to each other. On the inner periphery of the screw part 34 of the nut 32, the fe...

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PUM

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Abstract

A nut 12 serving as a fastening member includes a screw part 14 which is screwed to a joint body 11 and connects a pipe 10, and a holding part 15 which is held by a fastening tool when screwing the nut 12. The screw part 14 and the holding part 15 are coupled to each other before the screwing of the nut 12 to the joint body 11. When screwing the nut 12 to the joint body 11, the coupling of the holding part 15 and the screw part 14 is cancelled when the rotational torque of the holding part 15 reaches a predetermined value which is larger than the rotational torque at the time of completing the connection of the pipe 10, that is, after the connection of the pipe 10 is completed.

Description

Technical field [0001] The present invention relates to a pipe joint in which a pipe is connected to a joint body by screwing a tightening member on a joint body. Background technique [0002] Conventionally, in refrigeration devices, heat pump water heaters, etc., various pipe joints have been used in the connection portion of the refrigerant pipe through which the refrigerant circulates, for example, the flared pipe joint and the bite-in type joint disclosed in Patent Document 1 are used. In such a horn pipe joint and a bite-in type joint, as shown in Patent Document 1, a pipe is connected to the joint body by screwing a tightening member to the joint body. In other words, in the horn pipe joint, by screwing the tightening member, the pipe is clamped by the joint body and the tightening member, thereby connecting the pipe and the joint body. In the bite-in type joint, the bite portion is bitten into the pipe by screwing the tightening member, thereby connecting the pipe and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L13/00F16L19/08
CPCF16L19/103F16L19/00F16L19/14F16L13/00F16L19/02F16L19/08
Inventor 中田春男
Owner DAIKIN IND LTD