JPH0486393A - Sealed type electric compressor - Google Patents

Abstract

PURPOSE:To largely reduce a compressor noise by a relatively simple mounting method by providing a damper material for absorbing the high frequency vibration of a sealed vessel on the sealed vessel outer wall of a compressor through a bolt welded and fixed to the sealed vessel. CONSTITUTION:Bolts 13 are welded and fixed between each position 4c, 4d, 4e in which an electric motor part 2 and a compressor mechanism part 3 provided in a sealed vessel 1 are welded and fixed to the sealed vessel 1, or between the welding positions 4c, 4d, and 4c, 4e, and onto the outer wall of a sealed vessel lower part 1c. Damper materials 11 having through holes and steel plates arresting plate 12 having through holes are inserted to the bolts 13, and fixed to the sealed vessel 1 by nuts 14. Thus, the vibration energy of the sealed vessel 1 generated at the time of operation of the electric compressor can be converted into a thermal energy in the damper materials 11, so that the noise generated from the sealed vessel 1 can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a hermetic electric compressor used in an air conditioner.

2. Description of the Related Art Conventionally, as shown in FIGS. 7 and 8, a hermetic electric compressor has a structure in which an electric motor section 2 and a compression mechanism section 3 driven by the electric motor are disposed inside a hermetic container 1. The stator 2a of the electric motor section 2 and the cylinder section 4 of the compression mechanism section 3 are press-fitted into the closed container 1 or 4c, 4d.
, 4a, and the compression mechanism section 3 is disposed within the crankshaft 5 and the cylinder 4, which is directly connected to the rotor 2b of the electric motor section 2. A piston 6 and a bearing end plate 78 for closing the cylinder 4 are disposed at both ends of the cylinder 4, and a compression space constituted by the inside of the cylinder 4 and the outer diameter of the piston 6 is divided into a suction side 4a and a compression side 4b. The bearing end plate 7 or 8 was provided with a discharge hole (not shown) and a discharge valve (not shown) for opening and closing the discharge hole.

In the above configuration, when the electric motor unit 2 is driven, the refrigerant in the refrigeration cycle having a well-known structure is sucked in from the suction pipe 1a and flows from the suction side 4a of the cylinder 4 to the compression side 4b according to the transfer of the piston 6. It is compressed here, passes through a discharge notch (not shown) provided in the cylinder 4 and a discharge port (not shown) provided in the upper bearing end plate 8, and pushes up a discharge valve (not shown). , is discharged into the space 10a in the discharge muffler 10, is discharged into the airtight container through the discharge hole (not shown) provided in the discharge muffler 10, and is frozen again through the discharge pipe 1b → into the fuel. It is discharged.

Problems to be Solved by the Invention However, when the compressed refrigerant gas pushes up the discharge valve (not shown) and is suddenly ejected from the discharge hole (not shown), a large pressure wave is generated. It propagates to each part space and generates large gas pressure pulsations, and the compression mechanism part 3,
In addition, the closed container 1 is vibrated from inside to generate high frequency vibrations in the closed container 1, thereby inducing noise.

The present invention was made to solve the above problems, and an object of the present invention is to reduce compressor noise.

Means for Solving the Problems In order to solve the problem described in item 1, the present invention provides an electric motor and a compression mechanism driven by the electric motor, which is disposed inside a closed container, and wherein the compression mechanism is connected to the closed container. On the other hand, in an electric compressor that is fixed by welding or press-fitting, a damping material that absorbs high frequency vibrations of the sealed container and a steel plate that supports the vibration damping material are provided on the outer wall of the sealed container. It is installed via welded bolts and is crimped to the closed container with nuts.

Effect: According to the above structure, high frequency vibrations of the closed container can be damped, thereby reducing noise of the compressor.

Embodiment The present invention will be described with reference to the accompanying drawings showing one embodiment of the invention. FIG. 1 is a diagram showing the principle of the present invention, and FIGS. 2 and 3 are examples of the present invention.

First, the principle of the present invention will be explained with reference to FIG. 1 (al).

When the sealed container 1 is in a bending vibration state, the damping material 11 closely fixed to the sealed container 1 will also undergo bending vibration, but due to the expansion and contraction deformation, loss will occur inside the damping material 11, and vibration energy will be lost. is converted into thermal energy, and as a result, the bending vibration level of the vibration of the closed container 1 is reduced. Also, Figure 1 (
If the damping material has a restraining plate 12 on the second part, as in bl, the shear deformation of the damping material will be large, and the damping material 1]
Since it is a type that exhibits a high effect even if it is thin, it has the advantage that the total thickness does not need to be increased.

2 and 3 show 4c, 4d, in which the electric motor section 2 and the compression mechanism section 3 disposed in the hermetic container 1 of a hermetic electric compressor are welded and fixed to the hermetic container, 4e
and between the welding positions 4c and 4d, 4c,
A bolt 13 is welded and fixed to the outer wall of the sealed container 1 between 4c and the lower IC of the sealed container 1, and a damping material 11 having a through hole and a restraining plate 12 made of a steel plate having a through hole are attached to the bolt. It is configured to be inserted and fixed to the closed container 1 with a nut 14.

In the above configuration, when the electric compressor is operated, due to the large gas pressure pulsating force generated inside the compressor, the hermetic container 1 is damaged as shown in FIG. The points where the cylinder 4 is welded and fixed to the sealed container 1, 4c, 4d, and 4e, are nodes of vibration, and the rest have a vibration mode at a high frequency, which is an antinode of vibration. Since the damping material is installed at the position, the vibration energy of the sealed container 1 is converted into thermal energy inside the damping material, and as a result, the noise generated from the sealed container 1 is reduced. .

Next, the vibration characteristics of the compressor having the above configuration and the closed container 1 of the conventional compressor are shown in FIG. 5, and the noise characteristics are shown in FIG. 6. From these results, the compressor with the configuration of the present invention has 200
At high frequencies of 0 Hz or higher, the resonance characteristics are eliminated or relaxed, and as shown in FIG. 6, results were obtained in which the noise value was significantly reduced at frequencies of 1.000 Hz or higher.

Effects of the Invention As is clear from the above explanation, the hermetic electric compressor of the present invention has a damping material that absorbs high-frequency vibrations of the hermetic container and is welded to the outer wall of the hermetic container of the compressor. This is characterized by the fact that it is installed through a relatively simple installation method, which has the advantage of significantly reducing compressor noise.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing the principle of the present invention, Figures 2 and 3 are cross-sectional views showing the principle of the present invention.
The figures are a cross-sectional view, a cross-sectional view, and a cross-sectional view showing one embodiment of the present invention, respectively.
Fig. 4 is a schematic diagram explaining the vibration state of a closed container, Fig. 5 is a vibration characteristic diagram, Fig. 6 is a noise characteristic diagram, and Figs. 7 and 8 are a sectional view and a sectional view, respectively, showing a conventional example. be. 1... Airtight container, 2... Electric motor section, 3
...Compression mechanism section, 4...Cylinder, 4
a...Compression space suction side, 4b...Compression space compression side, 4c, 4d, 4e...Cylinder sealed container welding point, 5...Crankshaft , 6...
...Piston, 7...Lower bearing end plate, 8...
...Upper bearing end plate, 9...Partition plate, 10...
... Discharge muffler 11 ... Damping material, 12
...Restriction plate, 13...Bolt, 14.
...Natsuto. Name of agent Patent attorney Shigetaka Awano and 1 other person

Claims (1)

[Claims] In an electric compressor in which an electric motor and a compression mechanism section driven by the electric motor are disposed inside an airtight container, and the compression mechanism section is fixed to the airtight container by welding or press-fitting, on the outer wall of the airtight container, A damping material that absorbs high-frequency vibrations of the sealed container and a steel plate that supports the vibration damping material are installed via bolts welded and fixed to the sealed container, and are crimped to the sealed container with nuts. A hermetic electric compressor that is characterized by: