JPH03271667A - Piping joint for refrigeration cycle - Google Patents

Abstract

PURPOSE:To prevent leakage of gas from inside of a piping system and shield vibrations by a method wherein a pipe material the main component of which is high specific gravity metal prominent in the plastic fluidity, desirably lead, is used as an innermost diameter part of a joint, and a resinous recessed and protruded pipe is arranged on the outside of it. CONSTITUTION:Each end of a joint is provided with a copper pipe 1 to make the joint weldable, and has an expanded pipe part 1b for fixing and retaining a cover member. The copper pipe 1 is jointed with a lead pipe 2 through a soldering part 3. In this instance, it is desirable that a flow-in soldering part 3a is formed in a gap between the pipes 1 and 2 by capillarity, whereby the jointing strength is improved. Further, outside of it, there are provided a cover pipe 4 made of plastics or rubber, and a protection cover pipe 5 which is extendable in the vertical direction with respect to the inner pressure and the pipe diameter. These lead pipe 2, cover pipe 4 and protection cover pipe 5 are held tight with a hose bands 6 and 7. The joint is formed in the same shape at the both ends, and welded to a piping at a terminal part 1a. The inside of the cover pipe 4 is formed in a recessed and protruded pattern.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the structure of a pipe joint attached to the pipes of a refrigeration cycle having a compressor, a heat exchanger, a pressure reducing section, and the like.

[Prior Art] As described in Japanese Utility Model Application Publication No. 62-115065, the conventional structure has a three-layer structure including a metal bellows tube, an elastic body such as rubber, and a metal pipe. Metal nets were also used instead of metal bellows tubes.

[Problems to be Solved by the Invention] In the above-mentioned prior art, not only are the joining methods between each layer and the pipes unclear, but also, for example, when welded to the pipes,
Since it is a continuous body of metal, it is impossible to block vibrations, and if a metal net is used instead of a metal bellows tube, elastic materials such as rubber may easily allow the gas inside the tube to permeate to the outside. There was a problem.

The purpose of the present invention is not only to prevent gas leakage from inside the piping system, but also to broadly block vibrations.

[Means for solving the problem] In order to achieve the above object, a high specific gravity metal with excellent plastic fluidity, preferably lead as a main component, is used for the innermost diameter part of the existing joint, and a pipe material containing lead as a main component is used on the outside. It is equipped with concave and convex tubes made of resin. In addition, since refrigerant passes through the inside at high pressure, a lead pipe is fixed with a brazing material, such as solder, to maintain airtightness.

[Function] Pipe members whose main component is lead can be easily joined to copper piping materials by soldering, so airtightness is maintained much better than with organic adhesives. Therefore, there is no refrigerant leakage, and since the lead material does not easily propagate vibrations, low noise can be achieved.

[Example] An example of the present invention will be described below with reference to FIGS. 1, 2, and 3. The joint structure of the present invention, as shown in FIG.
Copper tubes 1 are disposed at both ends so as to be weldable to piping, and have expanded tube portions 1b for fixing and holding the covering material. The lead pipe 2 is joined to the copper pipe 1 by a solder part 3, and preferably, the joining strength is improved by forming an inflow solder part 3a in the gap between the two by capillarity. Further, on the outside thereof, a cladding tube 4 made of plastic, rubber, etc., and a protective cladding tube 5 against internal pressure, tube diameter, and vertical extension are provided. These lead pipes 2, cladding pipes 4. And the protective cladding 5 is secured to the copper tube 1 with a hose band 6.7. This joint has the same shape at both ends, and is welded to the pipe at the end 1a. Various shapes can be considered for the terminal portion 1a in order to facilitate connection with piping, but the effects of the present invention are not dependent on these shapes. The cladding tube 4 has an uneven inner surface.

Figure 2 shows the center part of the joint, but after joining the joint in the shape of Figure 1 in the middle of the refrigeration cycle piping, when the refrigerant actually passes through it, that is, during a test run, the internal pressure rises, and the lead pipe 2 becomes the clad pipe. 4 is shown deformed following the convex portions 4a and concave portions 4b of No. 4.

FIG. 3 shows an example in which the joint of the present invention is installed, and the compressor 8 and the outdoor heat exchanger 9 are housed inside the cabinet 10. The compressor 8 and the outdoor heat exchanger 9 are connected by a discharge pipe 11, and the compressed refrigerant is transferred to the outdoor heat exchanger 9.
flows into. On the other hand, in cabinet 1o, valve 15
This valve 15 is connected to the compressor 8 via the suction side piping 13. The vibrations of the compressor 8 are transmitted through the discharge side pipe 911 and the suction side pipe 913, vibrate to the heat exchanger 9, and further to the cabinet 10, resulting in large noise due to a resonance phenomenon in the housing. The vibration of the compressor 8, which is the source of this noise, can be reduced by attaching the joints 12 and 14 of the present invention to each pipe.

It becomes possible to reduce the amount by a large margin. Therefore, the joint of the present invention is shown in FIG. 1, in which the copper pipe 1 has a suction side pipe 1
3. Welded to the discharge side piping 11.

The vibrations of the compressor 8 are strongly propagated to the copper pipe 1 and solder part 3 of the joint, but the vibrations are greatly attenuated by the lead pipe 2, which is a low-vibration member, and the cladding pipe 4, such as plastic or rubber. This has the effect of suppressing the vibration amplitude to other parts, ultimately reducing the noise level. On the other hand, for the protective cladding tube 5, a woven metal material is good because of its vibration damping properties, flexibility, and strength, and the same effect can be expected even if the tube material is made into a jagged or loose shape by bulge processing etc. be.

The shape of the hose band 6.7 is not specified; the hose band 6 firmly holds the cladding tube 4 and the protective cladding tube 5 on the copper tube 1, and the hose band 7 is attached to the copper tube, the solder inflow part 3a, It securely holds the lead pipe 2, cladding tube 4, and protective cladding tube 5. In addition, the cladding tube 4 and the protective cladding tube 5 are made longer than the joint after welding the top of the copper pipe to the discharge side piping 11 and the suction side piping 13. The effects of the present invention can be expected even if the hose band 6 is used to secure the hose. Furthermore, the same effect can be obtained by integrally covering the hose band 6.7 with a metal fixing cap and crimping the parts to be secured with the hose band 6.7.

According to this example, the lead pipe, which is a high-density metal with plastic fluidity, not only has good vibration absorbing properties, but also has the ability to obtain a similar ridged or loose shape under internal refrigerant pressure without any preforming process such as bulging process. Therefore, it has a great effect on vibration damping.

Further, the high specific gravity metal with excellent plastic fluidity is not limited to lead, and the effects of the present invention can be expected as long as it is metal bonding, including solder bonding. Regarding the cladding tube 4,
The shape of the unevenness is not prescribed, but the unevenness is provided in consideration of the wall thickness, internal growth, etc. of the lead pipe 2. Furthermore, when selecting a highly flexible material such as rubber or elastomer, the effects of the present invention can be expected by providing the unevenness not only on the inner circumferential side but also on the outer circumferential side or on both the inner and outer circumferences. On the other hand, if the cladding tube 4 is sufficient in terms of strength, internal pressure, and direction of extension, there is no need to use the protective cladding tube 5. For example, there is a case where the cladding tube 4 is mainly made of resin and has a reinforcing material such as a metal wire arranged inside or outside.

[Effects of the Invention] According to the present invention, by attaching joints to the discharge-side piping and the suction-side piping, vibrations of the compressor can be isolated, which has the effect of reducing the noise level of the entire unit.

[Brief explanation of drawings]

FIG. 1 is a half sectional view of an embodiment of the present invention, FIG. 2 is a sectional view of the center of the joint in the drawing, and FIG. 3 is an internal side view of the outdoor unit. Explanation of symbols

Claims (1)

[Claims] 1. A high specific gravity metal with excellent plastic fluidity fixed to steel pipes at both ends with a brazing filler metal in a piping joint attached to piping of a refrigeration cycle having a compressor, a heat exchanger, and a decompression section. A piping joint for a refrigeration cycle, characterized in that it is composed of a pipe, a resin pipe with an uneven outer periphery, or a composite pipe whose main component is resin. 2. The piping joint for a refrigeration cycle according to claim 1, wherein the high specific gravity metal pipe with excellent plastic fluidity contains 90% or more of lead.