JPH09196514A - Piping vibration reducing device of refrigerating cycle device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a piping vibration reducing device of large refrigeration cycle with excellent vibration reduction effect at a relatively low cost and at low frequency. SOLUTION: In a refrigeration cycle device in which a discharge piping 3 and a suction piping 2 are connected to a compressor 1, and a discharge muffler is connected in the middle of the discharge piping 3, the suction piping 2 is connected to the discharge muffler 4 by a connection member 5 to reduce the vibration by coinciding the natural frequency of the suction piping 2 with the natural frequency of the spring-mass system to be determined by the discharge muffler 4 and the connection member 5. Since both the discharge muffler 4 is integratedly connected to the suction piping 2 by the connection member 5 having the damping function, the system is integrated as a whole, and the components mutually attenuate the vibration.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration reducing device for reducing vibrations caused by resonance of a discharge pipe or a suction pipe connected to a compressor in a refrigerating cycle such as a refrigerating machine or an air conditioner.

[0002]

2. Description of the Related Art In a refrigerating cycle such as a refrigerator or an air conditioner, a compressor, a condenser, an expansion valve and an evaporator are connected by piping, and a high pressure refrigerant gas pressurized by the compressor is sent to the condenser to be liquefied. The liquid refrigerant gas is expanded by an expansion valve, sent to the evaporator, evaporated by the evaporator, and returned to the compressor.

A suction pipe for sucking the refrigerant gas from the evaporator side and a discharge pipe for discharging the high pressure refrigerant gas from the compressor to the condenser side are connected to the compressor. In addition, a discharge muffler with a larger diameter than the discharge pipe is connected in the middle of this discharge pipe, and this discharge muffler reduces noise generated by shocking flow of refrigerant gas into the compressor and during discharge. It is supposed to do.

[0004]

By the way, among the above-mentioned constitutions, since the compressor compresses the refrigerant gas by the driving force, it is likely to generate vibration. For this reason, conventionally, a compressor is mounted on a vibration-proof rubber, and the vibration-proof rubber prevents vibrations generated in the compressor, particularly vibrations below the compressor.

However, the vibration generated in the compressor propagates not only to the compressor but also to the suction pipe and the discharge pipe, and the suction pipe and the discharge pipe generate vibration and noise. In particular, when the vibration frequency of the compressor and the natural frequency of the pipe match, the suction pipe and the discharge pipe resonate and the vibration becomes large, and there is a concern that these pipes may be damaged.

The vibration propagated to the suction pipe and the discharge pipe also propagates to the evaporator and the condenser connected to the suction pipe and the outer plate covering the evaporator and the condenser, and the evaporator, the condenser and the outer plate are subjected to the vibration. When shaken, noise may be generated.

In order to prevent such vibration, conventionally, for example, the suction pipe and the discharge pipe are individually wrapped around a damping material such as rubber, and the vibration of the suction pipe and the discharge piping is prevented by these damping materials. Means have been adopted.

However, in the method of supporting the pipe with such a damping material, the damping material such as rubber may not be elastically deformed sufficiently when the vibration has a low frequency, and the damping is sufficiently performed. There are times when I can't forget. Further, when the vibration has a low frequency, the vibration frequency of the compressor and the natural frequency of the pipe are likely to coincide with each other, so that the vibration of the pipe is likely to be large. Further, when the vibration has a high frequency, the energy of the vibration is large because the cycle of the vibration is fast, so that the effect becomes insufficient unless a large number of damping materials are attached. In particular, when controlling using an inverter circuit whose speed is easily controlled as a drive source of a compressor, if the generated vibration has a low frequency, the vibration cannot be sufficiently reduced.

The present invention has been made in view of the above circumstances. An object of the present invention is to provide a pipe vibration reducing apparatus for a refrigeration cycle which is relatively low in cost and has a great effect of reducing vibration even at low frequencies. To do.

[0010]

In order to solve the above problems, the invention of claim 1 connects a discharge pipe and a suction pipe to a compressor, and connects a discharge muffler in the middle of the discharge pipe. In the refrigeration cycle device, the suction pipe and the discharge muffler are connected by a connecting member having a vibration damping function, and the natural frequency of the suction pipe and the natural frequency of a spring-mass system determined by the discharge muffler and the connecting member. The feature is that the vibrations are reduced by matching with.

According to the structure of claim 1, since both the discharge muffler and the suction pipe are connected by a connecting member having a vibration damping function to be integrated, the discharge muffler and the suction pipe form one vibration system as a whole. These natural frequencies come to match. Therefore, the whole resonates, the vibration of the suction pipe is transmitted to the discharge muffler, and the vibration of the suction pipe is damped by the damping damper action of the spring-mass system of the discharge muffler. Moreover, since the two are connected by the connecting member having the vibration damping function, the vibrations are mutually attenuated.

The invention according to claim 2 is characterized in that a part of the suction pipe and the discharge muffler are arranged in parallel, and the suction pipe and the discharge muffler are connected by the connecting member. It is a piping vibration reduction device of the described refrigeration cycle device.

According to the structure of the second aspect, since a part of the suction pipe and the discharge muffler are arranged in parallel, it becomes easy to connect these pipes and the muffler with the connecting member. According to a third aspect of the present invention, the connecting member is provided with two cylindrical holes through which the suction pipe and the discharge muffler are inserted, and these two cylindrical holes have the suction pipe and the discharge muffler. The pipe vibration reducing device for a refrigeration cycle device according to claim 1 or 2, wherein a cut line for fitting therein is provided.

According to the structure of claim 3, since the connecting member is provided with two cylindrical holes, if the suction pipe and the discharge muffler are fitted into these cylindrical holes, they are connected to each other by the connecting member. In addition, since these cylindrical holes are provided with cuts, they can be easily attached to the suction pipe and the discharge muffler.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described.
The following description is based on FIGS. 1 and 2. FIG. 1 is a diagram showing a configuration in the vicinity of a compressor in an air conditioner having a refrigeration cycle, and FIG. 2 is a diagram showing a cross section of a connecting member made of rubber.

In FIG. 1, reference numeral 1 is a compressor, and a suction pipe 2 and a discharge pipe 3 are connected to the compressor 1. The suction pipe 2 and the discharge pipe 3 are not affected by the refrigerant gas (for example, a steel pipe is generally used when the refrigerant gas is ammonia, and a copper pipe is used when the refrigerant gas is chlorofluorocarbon). It is strong enough to withstand low temperatures.

The discharge pipe 3 is provided in the middle of the discharge pipe 3.
A discharge muffler 4 having a larger diameter and a larger weight than the discharge pipe 3 is provided.
The noise generated by the shocking flow when the refrigerant gas is sucked in and when the refrigerant gas is discharged from the compressor 1 is reduced. The discharge muffler 4 and the suction pipe 2 are arranged so as to partially adjoin each other in parallel, and the discharge muffler 4 and the suction pipe 2 adjacent to each other are connected by a connecting member 5 made of rubber or the like having a vibration damping function. ing. As shown in FIG. 2, the connecting member 5 has a dulled shape, that is, a first cylindrical hole 6 through which the discharge muffler 4 is inserted and elastically attached is formed on one side, and the other is formed on the other side. A second cylindrical hole 7 through which the suction pipe 2 is inserted and elastically attached is provided, and the first cylindrical hole 6 and the second cylindrical hole 7 are integrally connected. Then, in the connecting member 5, cuts 8 and 9 along the axial direction are formed on the side walls of the first cylindrical hole 6 and the second cylindrical hole 7, respectively.
Is provided to facilitate attachment and detachment of the connecting member 5 to the discharge pipe 3 and the suction pipe 2. The connecting member 5 has an appropriate spring constant by adjusting the hardness of rubber, the wall thickness of rubber, and the length in the axial direction. The spring constant of the discharge muffler 4 and the connecting member 5 is adjusted. The natural frequency and the natural frequency of the suction pipe 2 are adjusted to match. That is, the natural frequencies of the connecting member 5 and the discharge muffler 4 are obtained by the following equation.

[0018]

[Equation 1]

For this reason, the spring constant k of the connecting member 5 is adjusted by adjusting the hardness, wall thickness and axial length of the rubber of the connecting member 5.
By adjusting, the natural frequency of the discharge muffler 4 and the connecting member 5 and the natural frequency of the suction pipe 2 can be matched.

The operation of the pipe vibration reducing device of the refrigeration cycle apparatus having the above-mentioned structure will be described below. In the above configuration, the compressor 1 and the discharge pipe 3 are provided so that their natural frequencies do not match, and the discharge muffler 4 is further provided.
Further, the connecting member 5 and the suction pipe 2 are provided so that their natural frequencies match. Therefore, the transmission of vibration from the compressor 1 is suppressed, and the vibration of the suction pipe 2 is transmitted to the discharge muffler 4 having a large weight. Therefore, when the vibration has a low frequency, the vibration of the suction pipe 2 can be damped by the dynamic damper action due to the weight of the discharge muffler 4. Further, both of them are connected and restrained by a connecting member 5 having a vibration damping function, so that the connecting member 5 is vibrated by the vibration of the suction pipe 2 and the discharge pipe 3.
Shear deformation is caused, and this shear deformation is caused by the connecting member 5.
Since the energy in the shearing direction of is converted into heat energy, vibration can be absorbed thereby. Therefore, the vibrations can be mutually attenuated, and thus the noise can be reduced.

From the above, by controlling the speed of the drive source of the compressor 1 using the inverter circuit, it is possible to sufficiently absorb and reduce the vibration even when the vibration has a low frequency.

Further, since the discharge pipe 3 and the suction pipe 2 are connected by one connecting member 5, the conventional discharge pipe 3 is used.
And compared with the method that the suction pipe 2 was individually controlled,
A large damping effect can be obtained with a small number of parts.

Further, since the connecting member 5 is provided with the cuts 8 and 9, it is easy to fit the connecting member 5 into the discharge muffler 4 and the suction pipe 2. Although one embodiment of the present invention has been described above, the present invention is not limited to this, but can be variously modified. For example, instead of using the connecting member as the damping material, a spring member or an appropriate elastic member such as a sponge body may be used for connection.

[0024]

As described above, according to the first aspect of the present invention, the natural frequencies of the suction pipe protruding from the compressor, the discharge muffler, and the connecting member are the same, and the discharge muffler, the connecting member, and the suction member are in agreement. Vibration of piping is reduced.

According to the second aspect of the present invention, a part of the suction pipe and the discharge muffler are arranged in parallel, and it is easy to attach a connecting member for connecting these pipes. By connecting the arranged portions with a damping material, it is possible to provide a pipe vibration reduction device for a refrigeration cycle device that can effectively reduce vibration.

According to the invention of claim 3, since the damping material has two cylindrical holes, the suction pipe and the discharge muffler are fitted into the cylindrical holes and connected by the connecting member, It is possible to provide a vibration reduction device for a refrigeration cycle that reduces mutual vibrations and has a cut for fitting in the connecting member, so that fitting into the suction pipe and the discharge muffler is easy.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration around a compressor of a refrigeration cycle according to an embodiment of the present invention.

FIG. 2 is a view showing a cross-sectional shape of a connecting member of the embodiment.

[Explanation of symbols]

 1 ... Compressor 2 ... Suction pipe 3 ... Discharge pipe 4 ... Discharge muffler 5 ... Connection member 6, 7 ... Cylindrical hole 8, 9 ... Cut

Claims (3)

[Claims] 1. A refrigeration cycle apparatus in which a discharge pipe and a suction pipe are connected to a compressor, and a discharge muffler is connected in the middle of the discharge pipe, wherein the suction pipe and the discharge muffler have a vibration damping function. A pipe of a refrigerating cycle apparatus, characterized in that a natural frequency of the suction pipe and a natural frequency of a spring-mass system determined by the discharge muffler and the connecting member are connected to each other to reduce the vibration. Vibration reduction device. 2. The refrigeration cycle apparatus according to claim 1, wherein a part of the suction pipe and the discharge muffler are arranged in parallel, and the suction pipe and the discharge muffler are connected by the connecting member. Pipe vibration reduction device. 3. The connecting member is provided with two cylindrical holes through which the suction pipe and the discharge muffler are inserted, and the suction pipe and the discharge muffler are fitted into these two cylindrical holes. The pipe vibration reducing device for a refrigeration cycle apparatus according to claim 1, wherein a cut for inserting is provided.