JP5537822B2 - Piping joint structure - Google Patents

Description

  The present invention relates to a pipe joint structure for joining pipes together in advance when metal pipes are fixed by brazing.

  Conventionally, as means for joining pipes before brazing work, “a plurality of sets of interengaging devices composed of small protrusions and depressions on a fluid inlet / outlet pipe and a fluid inlet / outlet pipe mounting portion such as a tank in a heat exchanger. A pipe joining means provided with "" has been proposed (see, for example, Patent Document 1).

Japanese Utility Model Publication No. 61-58597 (claims, FIGS. 2 and 3)

  In the pipe joining means of Patent Document 1 described above, when the inlet pipe is fitted into the pipe mounting cylinder, the inlet pipe is inserted in an arbitrary direction with respect to the axis and then rotated to engage the small protrusion and the recess. It was. However, there is a problem in that it cannot be visually confirmed whether or not the small protrusion and the indentation are engaged at a predetermined position, and the brazing may be fixed at an incorrect position.

  The present invention has been made in order to solve the above-mentioned problems, and can be brazed and fixed after joining pipes at predetermined positions without using a pipe assembly jig, and can be joined in a visually observable state. It is intended to provide a pipe joint structure that can determine the relative position in the circumferential direction and the engagement allowance.

The pipe joint structure according to the present invention includes one pipe and the other pipe provided with an end portion having a diameter larger than the diameter of the end portion of the one pipe in the pipe joint structure for tightly fixing by brazing. , A restriction mechanism is provided that restricts the relative position and engagement margin in the circumferential direction of both pipes when the end of one pipe is inserted into the end of the other pipe. A protrusion provided on the outer peripheral surface of the pipe, a first recess formed continuously from the end face at the end of the other pipe, connected to the first recess, and connected to the first recess. A gap provided in the radial direction is wide and provided with a recess having a second recess with which the protrusion engages after passing through the protrusion , and a local portion provided at the end of one pipe and the end of the other pipe, respectively. A flat portion.

  In the present invention, the restriction mechanism restricts the relative position and engagement margin in the circumferential direction of one pipe and the other pipe. Therefore, in pipe assembly, rotational displacement and engagement in the axial direction during pipe joining. Brazing work can be performed in a state where the bill is regulated. Therefore, it is not necessary to produce and use pipe assembly jigs with different specifications each time, and it is possible to improve assembly quality and simplify assembly equipment and assembly work.

It is a partial internal front view which shows the whole air conditioner in Embodiment 1 and 2 of this invention. They are the partial perspective view (a) and partial sectional view (b) which show a pipe joint part in Embodiment 1 of the present invention. They are the fragmentary perspective view (a) and partial sectional view (b) which show a pipe joint part in Embodiment 2 of the present invention.

Embodiment 1 FIG.
1 and 2 are diagrams showing the first embodiment, FIG. 1 is a partial front view of the air conditioner, FIG. 2 (a) is a partial perspective view of a pipe joint, and FIG. 2 (b) is a pipe joint. It is a fragmentary sectional view of a part. Although an outdoor unit of an air conditioner will be described as an example of the pipe joint, the present invention is not limited to the air conditioner.

  The air conditioner main body 1 in FIG. 1 includes a blower 3, an electric / electronic component 4, a heat exchanger 5, and a compressor 6 inside an outer box 2. A pipe 7 connects refrigerant circuit components such as the heat exchanger 5 and the compressor 6.

  In FIG. 2 (a), 7a is a convex side pipe, and a projection 7b is provided on the outer peripheral surface thereof. 7c is a concave pipe, and its end 7f has a diameter larger than the diameter of the end of the convex pipe 7a. Further, a bag-like recess 7d and a recess 7e that engages with the protrusion 7b are formed on the end 7f continuously from the end face. The bag-like recess 7d and the recess 7e constitute a recess according to the present invention.

  In FIG. 2 (b), the bag-like recess 7d and the recess 7e of the concave pipe are formed continuously from the end face, but the gap of the bag-like recess 7d is narrower in the radial direction than the gap of the recess 7e. Yes. Therefore, at the time of pipe joining, first, the projection 7b of the convex side pipe is inserted into the bag-like concave part 7d using elastic force. When the projection 7b reaches the recess 7e, it is engaged, and the position is fixed in the circumferential direction and the depth direction. Then, even if a force in the direction opposite to the insertion is applied, the gap between the bag-like recesses 7d is narrower in the radial direction than the gap between the recesses 7e, so that the projections 7b are not pulled out and both pipes are joined and fixed. Is retained. By brazing the pipe joint in this state, sealing and fixing can be reliably performed.

Embodiment 2. FIG.
3A and 3B are diagrams showing Embodiment 2 of the present invention, in which FIG. 3A is a partial perspective view of a pipe joint, and FIG. 3B is a partial cross-sectional view of the pipe joint.
The difference from the first embodiment is that the cross-sectional shape of the end of the convex pipe 7a is not circular, but an irregular circular cross-section 7g provided with a flat portion 7i locally, and the corresponding concave portion. The end of the side pipe 7c is also an irregular circular end 7h provided with a flat portion similar to the above. 2 and 3 are denoted by the same reference numerals.

  According to Embodiment 2 above, in FIG. 3 (a), the bag-like recess 7d and the recess 7e of the concave pipe are formed continuously from the end surface, but the gap between the bag-like recess 7d is the recess 7e. It is narrower in the radial direction than the gap. At the time of pipe joining, first, the projection 7b of the convex side pipe is inserted into the bag-like concave part 7d using elastic force. At this time, since the flat portion is present at the end portions of both pipes, the rotational movement in the insertion process is restricted, so that the relative position in the circumferential direction can be restricted with higher accuracy. When the projection 7b reaches the recess 7e, it is engaged, and the position is fixed in the circumferential direction and the depth direction. Needless to say, even if a force in the opposite direction to the insertion is applied, the gap between the bag-like recesses 7d is narrower in the radial direction than the gap between the recesses 7e, so the projections 7b are not pulled out, and both pipes are joined and fixed. State is maintained. By brazing the pipe joint in this state, hermetic fixation can be performed more reliably.

  In the above description, one part (7b, 7d and 7e) forcing the pipe joining position, which forms a part of the regulation mechanism of the present invention, is one place. An effect is obtained. Moreover, although the flat part (7h and 7i) which forms a part of regulation mechanism of this invention is made into one place, you may provide in multiple places.

  DESCRIPTION OF SYMBOLS 1 Air conditioner main body, 2 Outer box body, 3 Blower, 4 Electric / electronic parts, 5 Heat exchanger, 6 Compressor, 7 Piping, 7a Convex side piping, 7b Protrusion, 7c Concave side piping, 7d Bag-like recessed part, 7e Concave part, 7f End part of concave side pipe, 7g Deformed circular cross section, 7h Deformed circular end part, 7i Flat part of convex side pipe.

Claims (1)

In a pipe joint structure that performs tight fixing by brazing,
Including one pipe and the other pipe having an end having a diameter larger than the diameter of the end of the one pipe;
When the end of the one pipe is inserted into the end of the other pipe, a restriction mechanism is provided that restricts the relative position in the circumferential direction of both pipes and the engagement allowance;
The regulation mechanism is
A protrusion provided on the outer peripheral surface of the one pipe;
A first recess formed continuously from an end surface at the end of the other pipe, and connected to the first recess, the gap in the radial direction of the pipe being wider than the first recess, A recess comprising a second recess with which the protrusion engages after passing the protrusion ;
Local flat portions respectively provided at an end of the one pipe and an end of the other pipe;
A piping joint structure characterized by comprising:

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