JPS59218323A - Suction muffler for closed compressor - Google Patents

Abstract

PURPOSE:To prevent increase in temperature of refrigerant gas and simplify a producing step, by making a wall of a noise eliminating box of a suction muffler for a closed compressor in a double-layered structure consisting of a metallic sound-insulating layer and a heat-insulating layer made of a heat insulator. CONSTITUTION:There is provided a noise eliminating box 1 of a suction muffler between a valve cover 3 mounted to a cylinder 2 of a closed compressor and a suction pipe 4. A wall 5 of the noise eliminating box 1 is constituted of an outside sound-insulating layer 6 made of metallic materials and an inside heat-insulating layer 7 made of synthetic resin material, etc. With this arrangement, a refrigerant gas to be sucked through the suction pipe is not heated to maintain temperature of the refrigerant gas constant, and the wall 5 may be fixed to the cylinder 2 by welding, etc.

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to a suction muffler for a hermetic compressor, and in particular can prevent the temperature of refrigerant gas sucked into a compression section from becoming too high. This article concerns the suction 7 flask of a hermetic compressor, which contributes to the simplification of the construction process.

[Problems with the Technical Background of the Invention] In general, the suction muffler of a hermetic compressor uses a material with a large mass to improve sound insulation, and is usually made of metal such as casting or steel plate. '3+ J, is formed and attached to the frame of the cylinder or compression part by soldering or welding.

On the other hand, the temperature of the refrigerant gas sucked into the compression section is required to be as low as possible in order to increase the volumetric efficiency of suction into the cylinder.

However, in the housing of a hermetic compressor, heat is generated from electric parts, etc., so the temperature is higher than that of the refrigerant gas being sucked in. Therefore, the insulation between the internal atmosphere of the housing and the refrigerant gas is ) is expected to reach 11.

However, as mentioned above, the suction manora (metal material 1
Since it is formed by 'i1, its thermal conductivity is 1'
)11 The porosity is large, and when the refrigerant gas flows through the suction muffler, it gets heated and expands.
There was a problem that the volumetric efficiency of suction into the air was reduced.

Therefore, instead of metal materials, a suction muffler formed using a high-insulating synthetic 4-hole material is known (A), but since the material is synthetic resin, it is fixed by brazing or welding. Since the cylinder cannot be fixed to the frame of the compression section with adhesive, it requires time for the adhesive to dry, which reduces the workability and fixation. There was a problem of a decrease in strength.Furthermore, if the material was made of synthetic resin, the mass would be smaller than that of metal, resulting in a problem that the sound insulation effect would be reduced.

LObject of the Invention] The present invention has been devised in view of the above-mentioned problems and to effectively solve them.

The purpose of the present invention is to prevent the temperature of the refrigerant gas sucked into the compression section from rising. The purpose of the present invention is to provide several suction mufflers.

[Summary of the Invention] The present invention achieves the above object by forming the wall of the sound-absorbing cavity box of the suction muffler into a two-layer structure consisting of a sound insulating wall layer made of metal and a heat insulating wall layer made of a heat insulating material. be.

[Embodiments of the Invention] A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a suction muffler according to the present invention.

A suction muffler muffling cavity box 1 has a suction pipe 4 connected thereto so that refrigerant gas sucked into the cylinder 2 via a valve cover 3 attached to the cylinder 2 is guided to a valve cup \3v1. In the middle of the pipe (,: ~ is being cut.

The wall body 5 that defines the external shape of the sound-absorbing cavity box 1 has a two-layer structure, with a sound insulating wall B6 made of a metal material cast on the outside, and a composite wall with insulation properties on the inside. A heat insulating wall layer 7 made of resin etc. is installed.
Being beaten.

In addition, the insulation layer 6 and the heat insulation wall layer 7 may be in close contact with each other, but in this embodiment, the dimensional accuracy of the inner heat insulation wall layer 7 is made rough in order to further improve the insulation performance and the sound deadening function. A void layer 8 is provided between these so that the material can be removed.

Furthermore, the inner wall surface of the sound insulating V layer 6 is protruded inward of the sound deadening cavity box 1, and a heat insulating wall layer 7 is provided on the inner wall surface of the sound insulating V layer 6 to form a constriction protrusion 9 that reduces the cross-sectional area of the refrigerant flow path. The structure is such that the noise reduction effect is enhanced. Note that the aperture protrusion 9 may be formed by the force of the heat insulating wall layer 7, and the inner wall surface of the sound insulating wall layer 6 may be formed into a smooth surface.

The sound deadening cavity box 1 is either cast integrally with the cylinder 2 or formed separately and attached to the outside of the cylinder 2 by soldering or welding.

The refrigerant circulates through the refrigeration cycle, becomes a low-pressure gas, flows through the suction pipe 4, and passes through the muffler box 1 of the suction muffler when being sucked into the cylinder 2. At this time, the surrounding atmosphere of the sound-absorbing cavity box 1 is muted due to the heat generated by electric parts (not shown), etc., but the inside and outside of the box are insulated by the heat-insulating wall layer 7.
The third refrigerant is not heated and its humidity can be kept approximately constant. Further, by providing the void layer 8, the heat insulating function of the wall body 5 is further enhanced.

As a sound deadening effect, a sound insulation function is exhibited by the mass effect of the sound insulation wall layer 6, and a sound absorption function is also exhibited by the void layer 8 and the aperture protrusion 9.

Regarding the manufacturing process, since the wall body 5 can be fixed to the cylinder 2 by brazing or welding, it can be firmly assembled in a short time, unlike the conventional J3. Further, regarding the inner heat insulating wall layer 7, by providing the void layer 8, its dimensional accuracy can be roughly set.

In addition, as shown in FIG. 2, when the sound-absorbing cavity box 1 is attached to the frame 10 of the compression section, the negative side of the hemp sound wall m6 is left open, and the heat insulating wall layer 7 is housed inside it. The open side surface may be placed over the end surface of the frame 10 and the joint may be fixed by brazing or welding.

Alternatively, as shown in FIG. 3, the sound deadening cavity box 1 may be formed of a steel plate or the like and have a substantially rectangular cross section, and may be connected to the inside of the valve cover 3 through the suction pipe 4.

By the way, in a hermetic compressor, refrigerant gas compressed in a cylinder generally flows from a valve cover to a discharge side via a discharge muffler. These days, the refrigerant gas around cylinder 1 to the knob, the valve cover, and its surroundings is quite high temperature.
Therefore, f' arrives at the discharge valve or suction valve, ICf,'l
There is a risk that the lubricating oil will burn and generate sludge. Therefore, as shown in FIG. 4 or FIG. 5, the connection port 12 of the discharge muffler 11 from the valve nozzle 3 is provided at the position farthest from the valve cover 3, and if these are connected by the discharge @13, the discharge pipe Since the wall thickness of the cylinder 13 is relatively thin and the heat dissipation effect is large, heat dissipation from the vicinity of the cylinder 1 to the knob 14, the valve cover 3 and its surroundings can be promoted, and the generation of sludge can be prevented.

[Effects of the Invention] As is clear from the above description, the present invention provides the following excellent effects.

■It is possible to prevent the temperature of the refrigerant gas sucked into the compression section from becoming too high.

■The volumetric efficiency of sucking refrigerant gas into the cylinder can be increased as much as possible.

■Machining and assembly processes can be simplified.

■The silencing function can be improved as much as possible.

■The structure is simple and can be easily adopted.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing a schematic configuration of one embodiment of a suction muffler according to the present invention, and FIGS. 2 and 3 each show a schematic configuration of other embodiments of a suction muffler according to the present invention. The side sectional view, FIG. 4, and FIG. 5 are schematic configuration diagrams showing different mounting structures for the discharge muffler. In the figure, 1 is a sound deadening cavity box, 5 is a wall, 6 is a sound insulation Iff, and 7
is a heat insulating wall layer, 8 is a void layer, and 9 is an aperture projection.

Claims (4)

[Claims] (1) A suction muffler connected to the suction side of the compression section of a hermetic compressor (here, the heavy body that defines the external shape of the sound-absorbing cavity box of the suction muffler is made of a metal material or the like).
A suction muffler for a hermetic compressor characterized by having a two-layer structure in which a sound wall layer and a heat insulating wall layer formed of a heat insulating material such as a resin material are stacked on the inside and outside. (2) A suction muffler for a hermetic compressor according to claim 1, wherein a void layer is provided between the sound insulating wall layer and the heat insulating wall layer. (3) A suction muffler for a hermetic compressor according to claims 1 and 2, wherein the sound insulating wall layer is provided on the outside and the heat insulating wall layer is provided on the inside. (4) The above-mentioned patent claim, wherein the sound insulating wall layer is disposed fully on the outside and the heat insulating wall layer is disposed on the inside, and a throttle protrusion is formed on the inner surface of the heat insulating wall layer to reduce the cross-sectional area of the refrigerant flow path. A suction muffler for a hermetic compressor according to items 1 and 2.