JPH045483A - Hermetic compressor - Google Patents

Abstract

PURPOSE:To reduce the noise of a compressor, improve the productivity, and achieve a light weight by forming a closed container for containing a motor part and a compressor part out of engineering plastic. CONSTITUTION:For a hermetic compressor 1, a closed container 2 for containing a compressor main body 5 consisting of a motor part 3 and a compressor part 4 is formed of engineering plastic. The natural frequency of the closed container 2 can be set low by this, so resonance with inner vibration of the compressor 1 is less likely to occur, and the damping factor of the closed container 2 can be improved, so the noise of the compressor 1 can be reduced. Post-processes relating to the closed container 2 are eliminated, so the productivity is improved, and a light weight can be achieved.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a hermetic compressor used in refrigerators, freezer showcases, and the like.

(b) Conventional technology Conventionally, this type of hermetic compressor was
As described in the above publication, an electric motor section and a compressor section are housed in a sealed container, these two parts are connected by a rotating shaft, and the opening of the cylinder of the compressor section is connected to a valve plate and a cylinder. ... It is constructed by closing with l-do. Here, since the sealed container is usually a pressure container to which an internal pressure of 4 to 5 kg/cm" is applied, it may even be formed by welding a pair of cup-shaped containers formed by deep drawing of steel plates for boat fishing. In addition, airtight terminals with pins sealed and fixed with glass are used for power supply terminals to the electric motor section1.
A second airtight terminal is attached to the sealed container by welding.

(c) Problems to be Solved by the Invention However, according to the above configuration, since the closed container is made of metal, its natural frequency is relatively high, and it is likely to resonate with the operating vibration of the compressor inside the container, and it will be damped. Due to the slow rate, there was a problem of increased noise. Furthermore, since the hermetic container is a pressure vessel as described above, high sealing properties are required for welding the airtight terminal, making welding workability and post-inspection troublesome. Furthermore, since the sealed container is made of metal, it requires post-processing such as painting for rust prevention, and it also has the problem of increased weight.

The present invention has been made in view of these points, and it is possible to suppress the resonance of the sealed container, reduce the noise of the compressor, eliminate post-processing related to the container, improve productivity, and promote weight reduction. The purpose is to provide a mold compressor.

(d) Means for Solving the Problems The present invention is a device in which an electric motor section and a compressor section are housed in a closed container, and the closed container is made of engineering plastic.

In addition, a pin for power supply to the electric motor section is fixed to an airtight container made of engineering plastic.

(E) Function The hermetic compressor of the present invention has the above-described structure, so that the natural frequency of the hermetic container is made low, making it difficult to resonate with the internal vibrations of the compressor, and the damping rate of the container is increased, so that the compressor can reduce noise. Since the sealed container is made of engineering plastic, post-processing such as painting for rust prevention is not necessary, and productivity can be improved.

In addition, in an airtight container made of engineering plastic,
Since the power supply pin to the electric motor part is fixed, the power supply pin can be fixed at the same time as the container is being formed.
Not only can the number of man-hours be reduced, but also the sealing performance can be improved, and there is no need to worry about poor insulation.

(f) Example Embodiments of the present invention will be described below with reference to the drawings.

Reference numeral 1 designates a hermetic compressor in which a compressor main body 5 consisting of an electric motor section 3 and a compressor section 4 is housed in a closed container 2, and the amphibious sections 3 and 4 are connected by a rotating shaft 6. The electric motor section 3 is composed of a stator 7 and a rotor 8. The compressor section 4 includes a motor case 9 that is fixed to the upper surface of the stator 7 and has a cylinder 9a integrally formed therein, a ball joint type piston 10 that slides reciprocatingly within the cylinder 9a, and a rotation # of this piston. I6 crank pin 11
The valve plate 13 and cylinder head 14 close the open end surface of the cylinder 9a. The motor case 9 includes, in addition to the cylinder 9a, a mounting leg 15 to the stator and a bearing 16.
and the abutting part 17 with the closed container 2 are integrally formed of casting. ] 8 is a balancer formed integrally with the rotating shaft 5.

The airtight container 2 is formed by vibration welding of two engineering plastic containers 2a and 2b. A mounting part 20 for a power supply pin 19 to the electric motor part 3 is integrally formed on the side wall of the container body 2a, and the power supply pin 19 is attached to the flange 21 of the pin at the same time as the injection molding of the container 2a. It is fixed by inserting it into the mounting part 20. 22 is a rib protruding from the inside of the container 2a, and the cluster 2 connected to the electric motor part 3 is connected to the protrusion 23 of this rib.
4 is inserted into the power supply pin 19 and the rib 22
It is held by fitting into the projection 23 of. Reference numeral 25 denotes a terminal fence protruding from the outside of the container 2a, and by attaching a cover (not shown) to this fence, the starting relay and protection relay connected to the power supply pin 19 are covered. Reference numeral 26 denotes a base plate integrally formed at the lower part of the container 2a, and by attaching this base plate to a base via anti-vibration rubber, the compressor is fixed to a device such as a refrigerator. Here, engineering plastics are synthetic beet resins with a tensile strength of 5 kg/m2 or more and a long-term heat resistance temperature of 100°C or more, but in the present invention, polyamides with particularly excellent refrigerant resistance and rigidity are used. Materials such as imide, polyimide, and alloy are suitable. It should be noted that an alloy is a mixture of two or more types of polymer materials, and can exhibit properties that exceed the physical properties of each material.

In the hermetic compressor configured as described above, the hermetic container 2 is made of engineering plastic, so the natural frequency of the hermetic container 2 is made low, making it difficult to resonate with the internal vibrations of the compressor, and also making it difficult to resonate with the internal vibrations of the compressor. The damping rate of the container can be accelerated and the noise of the compressor can be reduced.In addition, since the sealed container 2 is made of encinaging plastic, it can be easily used after painting for rust prevention, finishing polishing, etc. Processing can be made unnecessary and productivity can be improved.

In addition, an airtight container 2a made of engineering plastic
In addition, since the power supply pin 19 to the electric motor section 3 is fixed directly, the power supply pin 19 can be fixed at the same time as molding the container, which not only reduces the number of man-hours but also eliminates the need for the conventional method. Since no welding is required around the terminals, the sealing performance can be improved, and since the insulation distance between the power supply pins 19 can be long, there is no need to worry about poor insulation.

In addition, the terminal fence 25 and base plate 26 are also connected to the container 2.
Since it is integrally formed with a, the number of parts can be reduced and productivity can be improved.

(g) Effects of the Invention As described above, according to the present invention, the natural frequency of the closed container is made low to make it difficult to resonate with the internal vibrations of the compressor, and the damping rate of the container is increased to increase the frequency of the compressor. Can reduce noise. Furthermore, since the sealed container is made of engineered non-blasted material, post-processing such as painting for rust prevention is not necessary, and productivity can be improved.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a hermetic compressor showing an embodiment of the present invention, and FIG. 2 is a sectional view of essential parts of the compressor shown in FIG. 2... Sealed container, 2a, 2b... Container, 19... Power supply pin, 20... Mounting part, 24... Cluster.

Claims (2)

[Claims] (1) A hermetic compressor comprising an electric motor section and a compressor section housed in a hermetically sealed container, wherein said hermetic container is made of engineering plastic. (2) The hermetic compressor according to claim 1, characterized in that a pin for feeding power to the electric motor section is fixed to the hermetic container.