JPH0989417A - Pipe unit for air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the design of a pipe shape and the control of a compressor to prevent the vibration of a refrigerant pipe connected to the compressor of an air conditioner. SOLUTION: At the refrigerant pipe having a stainless steel bellows pipe and a flexible pipe 6 made of urethane rubber charged and cured in the gap space at a nitrile rubber cylinder concentrically disposed at an interval at the outside of the bellows pipe are connected in series on the way of a suction pipe 4 connected between a compressor 1 and a four-way valve 8, the part of a suction pipe 4 connected to the opposed side to the compressor 1 of the pipe 6 is fixed to the fixing part 7. Accordingly, the vibration of the pipe can be adsorbed to reduce in size the unit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piping device for connecting a refrigerant pipe of an air conditioner.

[0002]

2. Description of the Related Art Generally, vibration of a compressor is caused in a connecting pipe between a compressor of an air conditioner and an indoor heat exchanger and an outdoor heat exchanger, that is, a suction pipe portion to the compressor and a discharge pipe portion from the compressor. A vibration absorber is provided to prevent transfer to the heat exchanger.

FIG. 11 is a block diagram showing a piping device of a conventional air conditioner. In the figure, the pipe is made of a bare copper pipe, and vibrations are absorbed by a large number of loop pipes. The compressor 1 is elastically supported on the air conditioner main body or the base of the air conditioner via a vibration isolator 2, and a four-way valve 8 is arranged above it. An accumulator 5 is connected in the middle of a suction pipe 4 connecting the four-way valve 8 and the compressor 1, and the four-way valve 8 and the compressor 1 are connected to the discharge pipe 3
Connected by Further, the four-way valve 8 and the heat exchanger 9 are connected by the suction pipe 4 and the discharge pipe 3. Each of these tubes is bent in a loop around the compressor 1.

The conventional piping device for an air conditioner is constructed as described above. When the compressor 1 is driven to compress and discharge the refrigerant, the compressor 1 vibrates and the suction pipe 4 and the discharge are discharged. It is propagated through the pipe 3 and reaches the heat exchanger 9 through the four-way valve 8. However, the refrigerant pipes 3 and 4 are connected to the compressor 1
Since it is bent in a loop shape around, vibration damping is performed and vibration is gradually attenuated.

FIG. 12 is a block diagram showing another conventional piping device for an air conditioner. In the figure, compressor 1 to operation valve 1
The refrigerant pipe connected to 0 is fixed to the base having high rigidity by using the fixing metal fitting 7.

That is, when the compressor 1 is driven to compress and discharge the refrigerant, vibration is generated from the compressor 1 and propagates through the refrigerant pipe. The refrigerant pipe is fixed to the base by the fixing bracket 7. Therefore, the vibration propagating to the refrigerant pipe after the fixed portion is small.

[0007]

In the conventional piping device for an air conditioner shown in FIG. 11, the number of loops formed in the pipe is increased and the length of the pipe is increased, so that the flow of the refrigerant is increased. There is a problem that not only the resistance increases, but also the piping space becomes large and the device becomes large.

Further, as the number of loops formed in the pipes increases, the possibility that the pipes will come into contact with each other due to vibration of the pipes 3 and 4 increases, and positioning during assembly becomes difficult. If the pipe is fixed to prevent this, vibration is transmitted from the fixed portion, and the advantage of increasing the number of loops decreases.

Furthermore, as the number of loops formed in the pipe increases, the number of natural frequencies of the piping system also increases, and depending on the operating speed of the compressor, the operating speed of the compressor and the natural frequency of the piping system match. The resonance occurs, the vibration becomes large, and in the worst case, the pipe is broken. In particular, when the frequency of the input power source of the compressor 1 is changed and the operation speed of the compressor is changed, if the number of loops formed in the pipe is large, the frequency of resonance also increases, and the pipe for avoiding this It becomes very difficult to design the shape and control the compressor.

Further, in the structure shown in FIG. 12, since the refrigerant pipe is fixed, stress concentrates on the refrigerant pipe around the fixed portion and the refrigerant pipe at the bent portion. In order to avoid this concentration of stress, it is necessary to lengthen the refrigerant pipe and form many loops, so the same problems as those shown in FIG. 11 occur.

The present invention has been made in order to solve the above-mentioned problems, and it is possible to reduce the size of an air conditioner capable of sufficiently absorbing the vibration of the refrigerant pipe connected to the compressor of the air conditioner. An object is to provide a piping device.

[0012]

According to a first aspect of the present invention, there is provided a piping device for an air conditioner, wherein a flexible pipe is connected in series in the middle of a refrigerant pipe connecting a compressor and a control valve, The refrigerant pipe on the side opposite to the compressor of the pipe is fixed.

Further, a pipe device for an air conditioner according to a second aspect of the present invention is the pipe device for an air conditioner according to the first aspect of the present invention, in which a rubber mesh is disposed inside or outside a rubber cylinder forming a flexible tube. is there.

A piping device for an air conditioner according to a third aspect of the present invention is the piping device according to the first or second aspect of the present invention, in which the fixed portion of the refrigerant pipe is arranged in a position close to the flexible tube. The refrigerant pipe is fixed in a state where there is no bent portion between the fixed portion and the fixed portion.

Further, a piping device for an air conditioner according to a fourth aspect of the present invention is the one according to the first or second aspect of the invention, wherein the refrigerant pipe is constrained in a state having a degree of freedom in at least one direction.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. 1 to 3 are views showing an embodiment of the first invention of the present invention, FIG. 1 is a configuration diagram, FIG. 2 is a view showing a main part of FIG. 1, and (A) is a perspective view of a pipe fixing part. FIG. 3B is a horizontal cross-sectional view, and FIG. 3 is a vertical cross-sectional view of a flexible tube. In the figure, a compressor 1 is elastically supported by a body of an air conditioner or a base of an air conditioner via a vibration isolator 2. An accumulator 5 is connected in the middle of a suction pipe 4 connecting the four-way valve 8 and the compressor 1, and the outdoor unit heat exchanger 9 and the compressor 1 are connected via the four-way valve 8.

Reference numeral 6 denotes a flexible tube, which is connected in series in the middle of the suction pipe 4 which connects the accumulator 5 and the four-way valve 8. In the fixed portion 7 of the pipe, the suction pipe 4 is wrapped with a rubber pipe 11 and is pressed by a sheet metal 12 from above, and the sheet metal 12 is fixed to the substrate of the air conditioner, thereby fixing the suction pipe 4 and the substrate of the air conditioner. are doing. Flexible tube 6
A stainless steel bellows pipe 15 is welded to the suction pipe 4 at a welding portion 16. Urethane rubber 14 is filled in and closely adhered to the gap between the bellows tube 15 and the bellows tube 15 and the bellows tube 15 and the gap between the bellows tube 15 and the welded portion 16.

In the piping device of the air conditioner constructed as described above, the vibration from the compressor 1 is transmitted through the accumulator 5 and the suction pipe 4 as the refrigerant pipe, and the flexible pipe 6
Reach However, since the suction pipe 4 connected to the side opposite to the compressor 1 of the flexible pipe 6 is fixed by the fixed portion 7, the amplitude of the suction pipe 4 at the fixed portion 7 is suppressed, and vibration is mainly allowed. It is absorbed by the flexible tube 6. Therefore, the vibration transmitted from the fixed portion 7 first is considerably smaller than the vibration generated in the compressor 1. Therefore, the vibration of the outdoor unit of the air conditioner is as shown in FIG.
As described above, it is significantly reduced as compared with the outdoor unit that does not use the flexible tube 6. Further, since the stress applied to the pipe due to the vibration of the suction pipe 4 is absorbed by the flexible pipe 6, the concentration of the stress on the suction pipe 4 near the fixed portion 7 can be avoided.

Further, the flexible tube 6 is easily deformed, but since the suction pipe 4 is fixed, the position of the suction pipe 4 can be accurately determined during assembly. Therefore, the suction pipe 4
The length can be shortened and the space for disposing the suction pipe 4 can be reduced, so that the unit can be downsized. Further, since the number of loops required to absorb the vibration can be reduced, the number of resonance frequencies of the pipe can be reduced, and the pipe shape can be easily designed.

In this embodiment, the flexible pipe 6 is connected to the suction pipe 4, but the flexible pipe 6 may be connected in series to the discharge pipe 3 or both the discharge pipe 3 and the suction pipe 4. .
Further, in this embodiment, the flexible tube 6 having a cylindrical outer side is used, but a bellows-shaped one may be used. Further, although urethane rubber 14 is used as the filler, the same effect can be obtained by using styrene rubber, nitrile rubber, chloroprene rubber, butyl rubber, or silicone rubber.

Embodiment 2 FIG. FIG. 4 is a block diagram showing another embodiment of the first invention of the present invention. The compressor 1 is elastically supported by a main body of the air conditioner or a base of the air conditioner via a vibration isolator 2. Accumulators 5 and 25 are connected in the middle of a suction pipe 4 connecting the four-way valve 8 and the compressor 1, and the outdoor unit heat exchanger 9 and the compressor 1 are connected via the four-way valve 8. A flexible tube 6 is connected in series in the middle of the suction pipe 4 that connects the accumulator 5 and the accumulator 25. The accumulator 25 is a sheet metal band 26 and is fixed to an arm 27 fixed to the substrate of the air conditioner.

The vibration from the compressor 1 is transmitted to the accumulator 5 and the suction pipe 4, and reaches the flexible pipe 6. However, since the accumulator 25 is fixed, the amplitude of the accumulator 25 is suppressed and the vibration is mainly absorbed by the flexible tube 6. Therefore, the vibration transmitted first from the accumulator 25 is considerably smaller than the vibration generated in the compressor 1.
Therefore, the vibration of the outdoor unit of the air conditioner is significantly reduced as compared with the outdoor unit that does not use the flexible tube 6 as shown in FIG. 11.

Further, when the accumulator 25 is not fixed, the accumulator 25 is heavy and vibrates greatly so that the stress applied to the pipe becomes large. However, by fixing the accumulator 25, the amplitude is suppressed and the vibration is caused by the flexible pipe 6. Since it is absorbed by the portion, increase in pipe stress can be avoided.
Therefore, the length of the suction pipe 4 can be shortened and the space for disposing the suction pipe 4 can be reduced, so that the unit can be downsized. Also, since the number of loops required to absorb the vibration can be reduced,
The number of resonance frequencies of the pipe can be reduced, and the pipe shape can be easily designed.

In this embodiment, the flexible pipe 6 is used as the suction pipe 4, but the flexible pipe 6 may be connected in series to the discharge pipe 3 or both the discharge pipe 3 and the suction pipe 4. Further, in this embodiment, the flexible tube 6 having a cylindrical outer side is used, but a bellows-shaped one may be used.

Example 3. FIG. 5 is a longitudinal sectional view of a flexible tube showing an embodiment of the second invention of the present invention. Note that FIG. 1 is also used in the third embodiment. In this embodiment, the flexible tube 6 of the first embodiment is used.
Is replaced with the flexible tube 6 shown in FIG. As shown in FIG. 5, a stainless steel bellows pipe 15 welded to the suction pipe 4 is preliminarily reinforced with a mesh whose inner diameter is larger than the outer diameter of the bellows pipe 15 and is reinforced by a mesh 17 made of rubber, for example, a nitrile rubber cylinder. 13 are arranged concentrically. Then, a raw material obtained by mixing a liquid urethane rubber 14 with a chain extender and a cross-linking agent is injected into the space between the bellows tube 15 and the cylinder 13 and cured.

As a result, it is possible to obtain the urethane rubber 14 having no gap in the gap between the cylinder 13 and the bellows tube 15. Although the mesh 17 is shown as being arranged inside the cylinder 13, it may be arranged outside the cylinder 13.

That is, the flexible tube 6 is filled with the refrigerant,
When an internal pressure is applied, the expansion of the flexible tube 6 is suppressed by the nitrile rubber that is adjusted by the rubber mesh 17, and the stress is dispersed without concentrating on the timed portion of the flexible tube 6,
There is an effect that the pressure resistance of the flexible tube 6 can be improved.
Further, regarding the vibration of the suction pipe 4, the same effect as that of the first embodiment can be obtained. In this embodiment, nitrile rubber is used for the cylinder 13, but similar effects can be obtained by replacing it with styrene rubber, urethane rubber, chloroprene rubber, butyl rubber, or silicone rubber. Further, although the mesh 17 made of rubber is used in this embodiment, the same effect can be obtained by using a resin system such as nylon.

Example 4. 6 and 7 show a third embodiment of the present invention.
FIG. 6 is a diagram showing an embodiment of the invention, FIG. 6 is a configuration diagram of a main part, and FIG. In this embodiment, the fixing position of the fixing portion 7 of the first embodiment is changed, so that there is no bent portion between the flexible tube 6 and the fixing portion 18 of the suction pipe 4,
The suction pipe 4 is fixed at a position close to the flexible pipe 6. That is, the straight pipe portion adjacent to the flexible pipe 6 is fixed. As shown in FIG. 7, the flexible tube 6 and the fixing portion 18
There is no bend between them. The suction pipe 4 wrapped with the rubber pipe 19 is fixed by a sheet metal band 20 to a sheet metal arm 21 fixed to the substrate of the air conditioner.

That is, the vibration from the compressor 1 is transmitted through the accumulator 5 and the suction pipe 4 and reaches the flexible pipe 6.
However, since the suction pipe 4 connected to the side opposite to the compressor 1 of the flexible tube 6 is fixed at a position close to the flexible tube 6, the amplitude is suppressed and the vibration is mainly absorbed by the flexible tube 6. To be done. Therefore, the vibration transmitted from the fixed portion 18 first is considerably smaller than the vibration generated in the compressor 1. Therefore, the vibration of the outdoor unit of the air conditioner is significantly reduced as compared with the outdoor unit that does not use the flexible tube 6 as shown in FIG. 11. Further, since the stress applied to the pipe due to the vibration of the suction pipe 4 is absorbed by the flexible pipe 6 and there is no bent portion where the stress is likely to be concentrated, the stress applied to the pipe between the flexible pipe 6 and the fixed portion 18 is reduced. You can avoid concentration. Also, the suction pipe 4
Is fixed, the position of the suction pipe 4 can be accurately determined during assembly. Therefore, the length of the suction pipe 4 can be shortened and the space for disposing the suction pipe 4 can be reduced, so that there is an effect that the unit can be downsized.

Example 5. FIG. 8 is a perspective view of an essential part showing an embodiment of the fourth invention of the present invention. This embodiment is the first embodiment.
The fixing means of the fixing part 7 is changed, and the bent portion of the suction pipe 4 is constrained by a rubber guide 23 provided on a metal plate 22 fixed to the substrate of the air conditioner.
That is, the bending portion of the suction pipe 4 is restrained from moving in the lateral direction with respect to the bending direction, but is not restrained in other directions, and can freely move. Here, the metal plate 22 and the guide 23 form a fixed portion 24.

That is, the vibration from the compressor 1 is transmitted through the accumulator 5 and the suction pipe 4 and reaches the flexible pipe 6.
However, since the refrigerant pipe 4 connected to the opposite side of the flexible tube 6 from the compressor 1 is constrained laterally with respect to the bending of the pipe, the amplitude in this direction is suppressed, and the vibration is mainly caused by the flexible tube. Absorbed in 6 parts. Therefore, the vibration transmitted from the fixed portion 24 first becomes considerably smaller than the vibration generated in the compressor 1. Therefore, the vibration of the outdoor unit of the air conditioner is significantly reduced as compared with the outdoor unit that does not use the flexible tube 6 as shown in FIG. 11.

Further, since it can move freely except in the restraining direction, the stress applied to the suction pipe 4 around the fixed portion 24 can be released. Therefore, the length of the suction pipe 4 can be shortened and the space for disposing the suction pipe 4 can be reduced, so that the unit can be downsized. In this embodiment, the flexible pipe 6 is used as the suction pipe 4, but the flexible pipe 6 may be connected in series to the discharge pipe 3 or both the discharge pipe 3 and the suction pipe 4.

In this way, if the pipe is constrained only in the direction effective for vibration reduction, the pipe can move freely in the directions other than the constraining direction. There is an effect that the stress applied to can be released.

Embodiment 6 FIG. 9 and 10 are views showing another embodiment of the fourth invention of the present invention. FIG. 9 (A) is a perspective view of a main part, FIG. 9 (B) is a plan view of a restraint part, and FIG. 10 is a vibration diagram. It is a figure which shows a measurement result. In this embodiment, the suction pipe 4 is fixed to the substrate of the air conditioner by a tie wrap 28.
1, the movement of the suction pipe 4 in the direction perpendicular to the bending is not restricted.

FIG. 10 shows the measurement results of the floor excitation force and the vibration frequency.
Shown in In FIG. 10, ◯ is the result of the conventional apparatus, and □ is the result of the sixth embodiment. In this way,
Since the suction pipe 4 is not restricted in the parallel direction and has a degree of freedom, it has the same effect as that of the fifth embodiment.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a first embodiment of the present invention.

FIG. 2 is a view showing a main part of FIG. 1, in which (A) is a perspective view of a pipe fixing portion, and (B) is a cross-sectional view of (A).

FIG. 3 is a vertical cross-sectional view of the flexible tube of FIG.

FIG. 4 is a configuration diagram showing a second embodiment of the present invention.

FIG. 5 is a vertical sectional view of a flexible tube according to a third embodiment of the present invention.

FIG. 6 is a configuration diagram of a main part showing a fourth embodiment of the present invention.

FIG. 7 is an enlarged perspective view of the fixing portion shown in FIG.

FIG. 8 is a perspective view of a main part showing a fifth embodiment of the present invention.

9A and 9B are views showing a sixth embodiment of the present invention, in which FIG. 9A is a perspective view of a main part, and FIG. 9B is a plan view of the restraint part of FIG.

FIG. 10 is a diagram showing a vibration measurement result in FIG. 9.

FIG. 11 is a configuration diagram showing a piping device of a conventional air conditioner.

FIG. 12 is a configuration diagram showing a piping device of another conventional air conditioner.

[Explanation of symbols]

1 compressor, 3 refrigerant pipe (discharge pipe), 4 refrigerant pipe (suction pipe), 6 flexible pipe, 7 pipe fixing part, 8 control valve (four-way valve), 13 nitrile rubber cylinder, 14 urethane rubber, 15 stainless steel Bellows tube, 17 rubber mesh, 18 pipe fixing part, 24 pipe fixing part, 28 tie wrap.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takaharu Aoki 5-2-6 Imaike 5-chome, Chikusa-ku, Nagoya-shi, Aichi Konishi Engineering Co., Ltd.

Claims (4)

[Claims] 1. A bellows pipe made of stainless steel, a nitrile rubber cylinder disposed concentrically outside the bellows pipe with a gap therebetween, in the middle of a refrigerant pipe connecting a compressor and a control valve, and the above gap. In a piping device in which flexible tubes made of urethane rubber injected and cured into a pipe are connected in series, the refrigerant pipe connected to the side opposite to the compressor of the flexible tube is fixed, and the air conditioner is fixed. Plumbing equipment. 2. A rubber mesh is provided inside or outside a cylinder made of nitrile rubber.
The air conditioner piping device described. 3. A fixing portion of the refrigerant pipe is arranged at a position close to the flexible tube, and the refrigerant pipe is fixed in a state where there is no bent portion between the flexible tube and the fixing portion. The piping device for an air conditioner according to claim 1 or 2, characterized in that. 4. The piping device for an air conditioner according to claim 1 or 2, wherein the refrigerant pipe is constrained in a state having a degree of freedom in at least one direction.