JP2005042858A - Flare pipe joint structure, and product using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact flare pipe joint structure which is adaptable even when the diameter of a connection pipe is changed, and a product using the same. <P>SOLUTION: The flare pipe joint structure comprises a joint body with a fluid passage to allow fluid such as pressurized refrigerant to pass built therein, a pipe having a trumpet-shaped expanded portion abutted on a conical fastening surface of an end part of the joint body on a terminal, and a flare nut which has a cone-shaped storage surface to store the trumpet-shaped expanded portion of the pipe and is fastened to the joint body by screws via the cone-shaped storage surface. The diameter of the fluid passage of the joint body is substantially set to be the smaller inside diameter of the pipe so that the size of the conical fastening surface of the joint body is adaptable even when the size of the trumpet-shaped expanded portion is changed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a flare pipe joint structure capable of accommodating different pipe diameters and a product using the same.

  In the conventional flare pipe joint structure, in order to be able to cope with different pipe diameters, a plurality of flare screw stoppers corresponding to multi-size pipes having different outer diameters and a plurality of flare screw stoppers are respectively connected. And a flare adapter having a flare contact surface capable of mechanically sealing the trumpet-shaped expanded portion provided at the end of the end to the multi-sized tube having different outer diameters is pressed against the trumpet-shaped expanded portion provided at the end of the tubular end After that, the outer periphery of the flare screw stop portion having a size corresponding to the tube is screwed and tightened with a flare nut. (For example, refer to Patent Document 1.)

Japanese Patent Laid-Open No. 10-29284 (page 2-4, FIG. 1)

  As described above, the conventional flare pipe joint structure can cope with different pipe diameters, but the flare pipe joint structure becomes longer or the processing of the flare pipe joint structure becomes complicated. There was a problem that cost was high.

  The present invention has been made to solve such problems, and to obtain a flare pipe joint structure that is easy to process, is compact, and can be used even when the connecting pipe diameter changes, and a product using the same. With the goal.

  In the flare piping joint structure and the product using the same according to the present invention, the joint main body having a fluid path for passing a fluid such as a refrigerant, and the trumpet-shaped expanded pipe portion that comes into contact with the conical fastening surface at the end of the joint main body are terminated. And a flare nut having a mortar-shaped storage surface for storing a trumpet-shaped expanded portion of the pipe, and a flare nut fastened to the joint body via a screw via the mortar-shaped storage surface. In the structure, the size of the conical fastening surface of the joint body can be adjusted even if the size of the trumpet-shaped expanded portion changes due to the change in the pipe size. It is almost matched to the inner diameter of the smaller pipe size.

  Further, the size of the mortar-shaped storage surface of the flare nut is selected according to the trumpet-shaped expanded portion having the larger piping size.

  Moreover, the piping insertion hole of the mortar-shaped storage surface of the said flare nut is provided with each hole diameter size according to the change of the said piping size.

  Moreover, the said flare nut has each hole diameter size mark according to the said piping insertion hole size.

  Further, the joint body has a variable mark of the pipe size.

  The diameter of the fluid path on the anti-flare nut side is selected according to the outer diameter of the larger pipe size.

  The flare pipe joint structure according to any one of claims 1 to 6 is used.

  A joint main body having a fluid path for passing a fluid such as a refrigerant, a pipe having a trumpet-shaped expanded portion in contact with a conical fastening surface at the end of the joint main body, and a mortar for housing the trumpet-shaped expanded portion of the pipe A flare pipe joint structure comprising a flared nut and a flared nut fastened to the joint body via a screw through the mortar-shaped storage surface, wherein the size of the conical fastening surface of the joint body is Since the diameter of the fluid path of the joint body is substantially matched to the inner diameter of the smaller pipe size so that it can be accommodated even if the size of the trumpet-like expanded portion changes due to the change in the pipe size, The receiving area of the conical fastening surface is increased, and the trumpet-shaped expanded portion of the pipe is brought into contact with and supported by the same surface of the increased conical fastening surface. The change in pipe diameter, a compact to accommodate servants the trumpet-shaped expanded portion is changed, good usability, less flared pipe joint structure of the number of processing steps is obtained.

  In addition, since the size of the mortar-shaped storage surface of the flare nut is selected in accordance with the larger trumpet-shaped expanded portion of the pipe, it is possible to cope with changes in the trumpet-shaped expanded portion due to changes in the pipe diameter. Since the processing man-hours for the flare nut can be reduced, an economical and easy-to-use flare piping joint structure can be obtained.

  In addition, pipe insertion holes on the mortar-shaped storage surface of the flare nut are provided in each hole diameter size according to the change in the pipe size, so pipes with different diameters cannot be attached, so the pipe size changes Even so, it is possible to obtain a flare piping joint structure capable of accurately attaching the piping.

  Further, since the flare nut has the respective hole diameter size marks according to the pipe insertion hole size, a flare nut corresponding to the pipe size can be easily selected, so that an easy-to-use flare pipe joint structure is obtained.

  Moreover, since the joint body has the variable mark of the pipe size, it is not mistaken for other joint bodies that cannot be changed, so that a flare pipe joint structure that is easy to use can be obtained.

  In addition, since the diameter of the anti-flare nut side of the fluid path is selected according to the outer diameter of the larger pipe size, in particular, the fluid resistance of the refrigerant or the like on the anti-flare nut side is reduced, so that the fluid resistance A flare piping joint structure with a small size can be obtained.

  In addition, since the flare pipe joint structure according to any one of claims 1 to 6 is used, even if the model of the product is changed and the pipe size is changed, it can be easily assembled with a small number of types of joint bodies 1 and the refrigerant. A product using a highly reliable flare piping joint structure in which such fluids do not leak from the joint part can be obtained.

Embodiment 1 FIG.
A first embodiment of the present invention will be described with reference to FIGS.
1 is a schematic configuration diagram of the flare pipe joint structure of the present invention, FIG. 2 is a schematic cross-sectional view when a small size pipe is attached to the flare pipe joint structure of the present invention, and FIG. It is a schematic sectional drawing when large size piping is attached to the flare piping joint structure of invention.

  In these drawings, reference numeral 1 denotes a fluid passage 1c through which a fluid such as a refrigerant passes, and a joint main body 1a connecting the flare side pipe 3 and the anti-flare side pipe 4 of the fluid path. A conical fastening surface provided at the flare-side end and supported by contacting the trumpet-shaped expanded portion 3a of the flare-side pipe 3, 1b is an insertion hole into which the anti-flare-side pipe 4 is inserted, 1d is a threaded portion of the joint body, 2 is a flare nut that is screwed to the joint body 1, 2a is provided in the flare nut, a mortar-shaped storage surface that accommodates the trumpet-shaped expanded portion 3a of the flare-side pipe 3, and 2b is a mortar-shaped storage surface 2a. A threaded portion of a flare nut that is provided on the distal end side and is screwed to the threaded portion 1d of the joint main body, 3 is a flare-side pipe, and 3a is a trumpet-shaped pipe expanded portion provided at the end of the flare-side pipe 3.

  The size of the joint body 1 and the flare nut 2 is larger in the size of the joint 3 and the flare nut 2 so that the size of the joint 3 and the flare nut 2 can be accommodated even if the size of the flare pipe 3 changes. , And ensure the refrigerant speed (passing refrigerant speed) as a fluid by matching the inner diameter of the fluid path 1c through which the fluid such as the refrigerant passes to the size of the smaller pipe 3 to ensure that the refrigerating machine oil that has melted into the refrigerant returns. However, the size of the conical fastening surface 1a is increased, and even if the size of the trumpet-shaped expanded portion 3a changes due to the change of the flare side pipe 3 size, the structure of the same conical fastening surface 1a can be used. It has become.

  That is, the size of the conical fastening surface 1a of the joint body 1 is matched with the size of the trumpet-shaped expanded portion 3a of the larger flare side pipe 3 size, and the inner diameter size of the fluid path 1c of the joint body 1 is the size of the flare side pipe 3 size. A structure in which the size of the conical fastening surface 1a can be accommodated even if the trumpet-shaped expanded portion 3a changes due to the change in the size of the flare side pipe 3 by increasing the size of the conical fastening surface 1a in accordance with the smaller diameter. It has become.

  At this time, the size of the mortar-shaped storage surface 2a of the flare nut 2 is matched to the larger trumpet-shaped expanded portion 3a of the pipe 3, and the trumpet-shaped expanded portion 3a changes due to the change in the flare-side piping 3 size. In addition, by screwing the threaded portion 2b of the flare nut 2 to the threaded portion 1d of the joint body 1, the mortar-shaped storage surface 2a of the flare nut 2 becomes the trumpet-shaped expanded portion 3a on the conical fastening surface 1a of the joint body 1. It has a fixed structure.

  At this time, since the pipe insertion holes 2b of the mortar-shaped storage surface 2a of the flare nut 2 are provided in the respective hole sizes according to the change in the size of the pipe 3, the trumpet-shaped expanded portion 3a is formed by the change in the flare side pipe 3 size. In response to this change, the size of the pipe insertion hole 2b is changed in response to this change, the pressing area of the mortar-shaped storage surface 2a is changed, and the mortar-shaped storage surface 2a with the changed pressing area changes the wrapper. The tubular expanded portion 3a is firmly fixed to the conical fastening surface 1a of the joint body 1.

  In the above structure, the flare nut 2 has respective hole size marks according to the pipe insertion hole size, and the joint body 1 has a variable pipe size mark. The diameter of the anti-flare nut side of the fluid path 1a is provided in accordance with the larger size of the flare side pipe.

  Next, the assembly operation of the flare piping joint structure configured as described above will be described. First, after taking out the joint main body 1 having the pipe size variable mark, the flare side pipe 3 having the trumpet-shaped expanded portion 3a at the tip is taken out, and the size of the flare side pipe 3 is confirmed.

  Next, as a result of the confirmation, for example, when the pipe size is smaller, the flare nut 2 that can be inserted only into this pipe is confirmed and taken out from the hole size mark.

  Next, after the trumpet-shaped expanded portion 3a of the pipe 3 is applied to and pressed against the conical fastening surface 1a of the joint body 1 thus taken out, the flare nut having an insertion hole 2a that is substantially the same as the outer diameter of the pipe. 2 is inserted from the insertion hole, and the screw of the flare nut 2 is screwed onto the screw 1d of the joint body 1 so that the mortar-shaped storage surface 2a of the flare nut 2 is brought into contact with the trumpet-shaped expanded portion 3a of the pipe. The flare side pipe 3 is fixed to the joint body 1 with a flare nut 2 as shown in FIG.

  At this time, since the pipe insertion hole 2a of the flare nut 2 is substantially the same as the outer diameter of the pipe, the pressing area of the mortar-shaped storage surface 2a of the flare nut 2 is as shown in FIG. Since the conical fastening surface 1a of the joint body 1 is also large with respect to the portion 3a, the trumpet-shaped expanded portion 3a of the pipe 3 is firmly fixed to the joint body 1 with an airtight structure. .

Further, even when the flare side pipe 3 is larger in size, that is, when the trumpet-shaped expanded portion 3a is larger, the airtight structure as shown in FIG.
In the above description, the flare nut 2 is inserted into the pipe 3 later. However, the flare nut 2 may be inserted into the pipe 3 in advance.

  Next, before or after these assembly operations, the anti-flare nut is connected to the anti-flare nut side connection port 1b of the fluid path of the joint body 1 adjusted to the outer diameter of the larger pipe size in consideration of the fluid resistance of the refrigerant or the like. Connect the side pipe 4.

  Next, when any one of these flare piping joint structures is used for a product such as an air conditioner, even if the product model changes and the piping size changes, it can be easily assembled with a small number of types of joint bodies 1 and It is possible to prevent fluid such as from leaking from the joint portion.

It is a schematic block diagram of the flare piping joint structure in Embodiment 1 of this invention. It is a schematic sectional drawing of the flare piping joint structure when the piping size in Embodiment 1 of this invention is small. It is a schematic sectional drawing of the flare piping joint structure when the piping size in Embodiment 1 of this invention is large.

Explanation of symbols

  1 joint body, 1a joint conical fastening surface, 1b insertion hole, 1c joint fluid path, 1d joint screw, 2 flare nut, 2a mortar-shaped storage surface, 2b flare nut screw, 3 flare side piping, 3a trumpet expansion 4 Anti-flare piping.

Claims (7)

A joint main body having a fluid path for passing a fluid such as a refrigerant, a pipe having a trumpet-shaped expanded portion in contact with a conical fastening surface at the end of the joint main body, and a mortar for housing the trumpet-shaped expanded portion of the pipe A flare pipe joint structure comprising a flare nut having a shape-like storage surface, and a flare nut fastened to the joint body via a screw via the mortar-shaped storage surface,
The size of the joint body fluid path is set to the pipe size so that the size of the conical fastening surface of the joint body can be accommodated even if the size of the trumpet-shaped expanded portion changes due to the change in the pipe size. Flare piping joint structure characterized by being almost matched to the inner diameter of the smaller one. The flare pipe joint structure according to claim 1, wherein the size of the mortar-shaped storage surface of the flare nut is selected in accordance with the trumpet-shaped expanded pipe portion having the larger pipe size. The flare pipe joint structure according to claim 2, wherein pipe insertion holes on the mortar-shaped storage surface of the flare nut are provided with respective hole diameter sizes according to changes in the pipe size. The said flare nut has each hole diameter size mark according to the said piping insertion hole size, The flare piping joint structure of Claim 3 characterized by the above-mentioned. The flare pipe joint structure according to claim 1, wherein the joint body has a variable mark of the pipe size. The pipe joint structure according to claim 1, wherein the diameter of the fluid path on the side opposite to the flare nut is selected according to the outer diameter of the larger pipe size. A product using the flare piping joint structure according to any one of claims 1 to 6.

Images