JPH0610875A - Silencer for compressor - Google Patents

Abstract

PURPOSE:To prevent a silencing effect from its decrease due to columnar resonance so as to reduce compressor noise by providing a chamber in a connecting pipe. CONSTITUTION:A chamber 15 provided in a connecting pipe 11 is formed to be sealed by welding or the like and arranged in a closed case 2. Refrigerant gas compressed in a cylinder 7 is once delivered to a delivery chamber 10a through a valve in a hollow cavity part of a bearing 9, delivered to the chamber 15 through the connecting pipe 11 from a delivery hole provided in a delivery cover 10, and further delivered to a delivery chamber 13a by the connecting pipe 11, to guide the gas to a cooling system from a tail pipe 14. In a process thus provided, a pressure pulsation generated in the cylinder 7 is damped by the first silencer 12, constituted of the hollow cavity part and the delivery chamber 10a, second silencer 13 and the chamber 15, to actuate the chamber 15 as an expansion type silencer, and a refrigerant pressure pulsation is damped in the case that a refrigerant passes through the delivery chambers 10a, 13a and the chamber l5. In this way, compressor noise can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to noise reduction of a compressor used in a refrigerating machine.

[0002]

2. Description of the Related Art A compressor used in a refrigerating and refrigerating apparatus compresses a refrigerant in a cylinder and discharges it to a cooling system. Therefore, pressure pulsation occurs in the refrigerant, which vibrates the compressor, piping, cooling equipment, etc. It was making noise. Therefore, conventionally, a muffler is provided immediately after the refrigerant compressed in the cylinder is discharged, or if the pressure pulsation cannot be suppressed, another muffler is provided to reduce noise. .

An example of the conventional silencer for a compressor described above will be described below with reference to the drawings.

FIG. 4, FIG. 5 and FIG. 6 show an example of a silencer of a conventional compressor, where 1 is a compressor and 2 is a closed case,
A stator 3 is shrink-fitted and fixed to the closed case 2.
A rotor 4 is connected to the crankshaft 5. 6
Is a rotary type piston, and 7 is a cylinder. Reference numeral 8 denotes a rotor-side bearing, which is welded and fixed to the closed case 2. Reference numeral 9 is a bearing at the end of the shaft, and 9a is a recess for mounting a valve (not shown). A discharge chamber 10a is constituted by fixing a cup-shaped discharge cover 10 to the bearing 9. The discharge hole 10 is formed in the discharge cover 10.
b is provided, and the joint portion 11a of the connection pipe 11 is press-fitted and fixed. The recess 9a of the bearing 9 and the discharge chamber 10a form a first silencer 12. 13 is the discharge chamber 13a, the connection pipe 11 is 1/2 inserted
Further, it is the second silencer configured by inserting the tail pipe 14 connected to the cooling system by ¼.

In the muffler of the compressor constructed as described above, the refrigerant gas compressed in the cylinder 7 whose operation will be described below is discharged through the valve (not shown) in the recess 9a of the bearing 9. It is discharged to the chamber 10a at one end, discharged from the discharge hole 10b provided in the discharge cover 10 to the discharge chamber 13a through the connection pipe 11, and further guided to the cooling system from the tail pipe 14.

Therefore, the recess 9a and the discharge chamber 1
The first muffler 12 and the second muffler 13 composed of 0a function as expansion mufflers, and the refrigerant is discharged from the discharge chamber 1
The pressure pulsation of the refrigerant is attenuated when passing through 0a and 13a. Particularly, the second silencer 13 enhances the pulsation damping effect by the effect of 1/2 insertion and 1/4 insertion, and the first silencer 12 and the second silencer 13 have a two-stage silencer structure, and further the pulsation damping effect. Is increasing. Therefore, the pressure pulsation component of the compressed refrigerant gas guided to the cooling system is sufficiently reduced, and the generation of noise can be reduced.

[0007]

However, in the above-mentioned configuration, the first silencer 12 and the second silencer 13 have a two-stage silencer configuration, and the discharge chamber 10a, between the two silencers, When the air column resonance mode in which 13a becomes an antinode and the connection pipe 11 serves as a node occurs and the resonance frequency approaches the fundamental wave having the largest pressure pulsation component, there is a problem that the sound deadening effect is significantly reduced.

In view of the above problems, it is an object of the present invention to avoid the resonance between two silencers from the pressure pulsation fundamental wave frequency to prevent a reduction in the silencing effect due to air column resonance and to reduce the compressor noise. I am trying.

[0009]

In order to achieve the above object, a muffler of a compressor according to the present invention comprises an electric compression element, a first silencer communicating with a discharge hole of the electric compression element, and a first silencer. And a second silencer communicating with the connection pipe via a connection pipe, and the connection pipe is provided with a chamber.

Further, the chamber provided in the connection pipe is formed by the expansion pipe of the connection pipe.

[0011]

According to the present invention, due to the above structure, the chamber provided in the connecting pipe softens the acoustic spring of the first silencer or the second silencer, and the air generated between the first silencer and the second silencer is generated. The column resonance frequency is remarkably lowered, the pressure pulsation fundamental wave frequency can be largely avoided, and the pressure pulsation damping effect can be enhanced overall.

Further, by forming the chamber provided in the connection pipe by the expansion pipe of the connection pipe, it is possible to improve reliability without the need for welding and to easily assemble at a low cost.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A muffler for a compressor according to an embodiment of the present invention will be described below with reference to the drawings. In order to avoid duplication of description, the same parts as those of the conventional example will be denoted by the same reference numerals.

In FIG. 1, reference numeral 15 denotes a chamber provided in the connection pipe 11, which is hermetically formed by welding or the like.
It is arranged in the closed case 2.

The operation of the embodiment configured as described above will be described. The refrigerant gas compressed in the cylinder 7 is once discharged to the discharge chamber 10a through a valve (not shown) in the recess 9a of the bearing 9, and the discharge cover 10
The gas is discharged into the chamber 15 through the connection pipe 11 from the discharge hole 10b provided in, and further discharged into the discharge chamber 13a through the connection pipe 11 and guided to the cooling system through the tail pipe 14.

In this process, the pressure pulsation generated in the cylinder 7 causes the first muffler 12, the second muffler 13 and the chamber 15 constituted by the concave portion 9a and the discharge chamber 10a to be an expansion muffler. As a result, the pressure pulsation of the refrigerant is attenuated when the refrigerant passes through the discharge chambers 10a, 13a and the chamber 15.

Here, conventionally, the discharge chambers 10a, 1
Although the frequency of the air column resonance mode in which 3a is the belly and the connection pipe 11 is the node is close to the pressure pulsation fundamental wave frequency, the acoustic spring of the first silencer is softened by the chamber 15, and the air column resonance frequency is remarkably high. descend. Therefore, the air column resonance frequency can be largely avoided from the pressure pulsation fundamental wave frequency, and the silencing effect near the fundamental wave frequency can be improved.

Further, conventionally, the second silencer 13 enhances the pulsation damping effect by the effect of 1/2 insertion and 1/4 insertion, and the first silencer 12 and the second silencer 13 have a two-stage silencer structure. Although the pulsation damping effect was enhanced to some extent, by providing the chamber 15 of the present invention, a three-stage silencer structure can be obtained, and the pressure pulsation damping effect can be further enhanced and the silencing effect can be improved as compared with the conventional case.

Further, as shown in FIGS. 2 and 3, the connecting pipe 1
1 is not a method of fitting and joining the chamber 15 provided by welding or the like, but a straight pipe is fixed by jigs 16 and 17 having the outer shape of the chamber 15 and high pressure is applied to the inside of the pipe, By forming the chamber 15 by inflating it from the inside and plastically deforming it, the connection pipe 11 can be integrally formed, and there is no need for welding or the like to improve reliability, and at the same time, it can be easily assembled at low cost.

The same effect can be obtained even if the chamber 15 is provided at any position of the connection pipe 11.

[0021]

As described above, according to the present invention, the electric compression element, the first silencer that communicates with the discharge hole of the electric compression element, and the second silencer that communicates with the first silencer via the connection pipe are provided. By providing a chamber in the connecting pipe, the acoustic spring of the first silencer or the second silencer becomes soft, the air column resonance frequency is significantly lowered, and the pressure pulsation fundamental wave frequency can be largely avoided. , It is possible to prevent deterioration of the muffling effect. Furthermore, the first muffler, the second muffler, and the chamber provided in the connection pipe form a three-stage muffler structure, whereby the damping effect of the pressure pulsation can be enhanced overall, and the muffling effect can be improved.

Further, since the chamber provided in the connection pipe is formed by the expansion pipe of the connection pipe, the reliability is improved without the need for welding or the like, and the assembly can be easily performed at low cost.

Thus, it is possible to provide a highly reliable, low cost, low noise compressor that can be easily assembled.

[Brief description of drawings]

FIG. 1 is a sectional view of a compressor according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing another example of a compressor before forming a chamber.

3 is a cross-sectional view after formation of the chamber of FIG.

FIG. 4 is a conventional connecting pipe for a compressor, a second silencer,
Perspective view showing the tail tube

FIG. 5 is an exploded perspective view showing a bearing and a discharge cover of a compressor showing the conventional example.

FIG. 6 is a sectional view of a compressor showing the conventional example.

[Explanation of symbols]

 1 Compressor 9 Bearing 10 Discharge Cover 11 Connection Piping 12 First Silencer 13 Second Silencer 14 Tailpipe 15 Chamber

Claims (2)

[Claims] 1. A chamber comprising: an electric compression element; a first silencer that communicates with a discharge hole of the electric compression element; and a second silencer that communicates with the first silencer through a connection pipe. A silencer for a compressor, characterized by being provided with. 2. The silencer for a compressor according to claim 1, wherein the chamber provided in the connection pipe is formed by an expansion pipe of the connection pipe.