JPS606089A - Closed type motor compressor - Google Patents

Abstract

PURPOSE:To prevent a metal gauze from being covered with glowth air-bubbles in a closed type motor compressor in which oil is fed to slide parts by means of a centrifugal pump disposed in the lower section of a crankshaft, by providing a spherical crown shape oil strainer to the suction side of the centrifugal pump. CONSTITUTION:A wire gauze 11 is formed in a spherical crown shape with the effective oil passage section of the wire gauze being directed downward. The metal gauze 11 is simultaneously reinforced and secured in an oil strainer by clamping its outer ring-like periphery of the gauze 11 with a thin-plate strainer retainer 12. Accordingly, growth air-bubbles 10 created upon foaming are released upward along the surface of the metal gauze so that the surface of the gauze is not entirely covered with air-bubbles. With this arrangement oil may smoothly pass through the strainer even upon foaming.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a coil strainer portion of a hermetic electric compressor.

[Background of the invention]

FIG. 1 shows seven examples of prior art. 2 is an oil hole 3a provided in the lower part of the crankshaft 3 in the axial direction. It acts as a centrifugal pump and lubricates the lower bearing metal 7, the upper bearing metal 8, and the rod 9 through the oil supply hole 3b.The crankshaft 3 is driven by a motor 40 and is fixed to the thrust load bearing frame 6. Supported by 5.

The structure of the oil strainer used in the conventional hermetic electric compressor mentioned above is shown in FIGS. 2 and 3.

FIG. 2 shows a structure in which gold r#14a is fixed by press-fitting and fixing a strainer holder 4b to the outer diameter part of the frame, and the strainer holder 4b and the gold steel 4a are separate pieces. Figure 3 shows the outer periphery of the gold-bronze 4a (7) with a thin plate.
It is inserted in a ring shape to reinforce and fix the entire valve 14a, and has a structure in which a flange is formed on a thin plate and is press-fitted into the inner diameter part of the frame.

Such conventional oil strainers have the following drawbacks because the oil filtering part made of gold and steel is flat. That is,
When starting with the refrigerant in the lower part of the chamber melted, the refrigerant gas in the pond becomes fine bubbles due to the drop in the chamber, and these fine bubbles form the metal steel 4a of the strainer.
These fine bubbles adhere to the underside of the crankshaft and grow. Gas covers the gold-copper surface, preventing oil from passing through the gold-copper, preventing oil from being supplied to the centrifugal pump at the bottom of the crankshaft, and causing oil to reach the bearing metal. This caused poor sliding, which in turn caused the d-bearing to seize up and cause a 4μ accident.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide an oil strainer in which an oil passage is not obstructed by generated air bubbles.

[Summary of the invention]

In order to achieve the above object, the present invention provides a closed electric compressor in which each sliding part is lubricated through a lubricating hole in the crankshaft by a centrifugal pump provided at the bottom of the crankshaft.
The centrifugal pump is characterized in that a spherical oil strainer is provided on the suction side of the centrifugal pump.

During forming, fine bubbles of refrigerant gas form gold A1,
As these fine bubbles grow on the surface of the gilt copper, the buoyancy of the bubbles becomes greater than the adhesion force of the bubbles, and the growing bubbles escape upward from the surface of the gilt copper, preventing the growing bubbles from clogging the gilt copper. Oil can be smoothly supplied to the oil supply pump even during forming.

[Embodiments of the invention]

Hereinafter, the present invention will be explained in detail with reference to an embodiment shown in FIGS. 4 and 5.

Gold #S11 is formed into a spherical crown shape with approximately the effective oil passage j4i of the gold steel facing downward.

The gold-copper 11 of the oil strainer is reinforced and fixed at the same time by being sandwiched around the outer circumference in a ring shape by a thin strainer plate 12. The strainer is formed with a flange extending in the 111+ direction, and has a structure that can be press-fitted into the hole of the frame 6, so that it can be easily press-fitted and fixed to the frame in a narrow space. is formed.

Therefore, during forming 1 ((generated growth bubbles 10
The bubbles live on the surface of the gold and steel and escape upwards, and the entire surface of the gold and copper is no longer covered with air bubbles, allowing the oil to pass through the strainer smoothly even during forming. Smooth oil supply to the bearing metal is possible. According to experiments, it has been confirmed that if the radius of curvature of gold-bronze is 80 mm or less, growth gas can be produced, and in practice, there is no problem in clogging the wire mesh with growth gas.

〔Effect of the invention〕

Since the present invention is constructed as described above, when oil passes through gold #1, the passage is not blocked by air bubbles.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional closed type strainer, Figs. 2 and 3 are partial views of a conventional strainer, Fig. 4 is a partial view of a strainer of the present invention, Fig. 5 A in Fig. 4 It is an arrow view. 4a... Gold 4b... Strainer Zazae 6...-
Frame 10...Bubble 11...Gold 12...
Strainer Sasae No. 1 Hime Ikuichi Adventure No. 1

Claims (1)

[Claims] 1. In a hermetic electric compressor in which each sliding part is supplied with oil through an oil supply hole in the crankshaft by a centrifugal pump provided at the bottom of the crankshaft, a spherical crown-shaped compressor is provided on the suction side of the centrifugal pump. A hermetic electric compressor characterized by being equipped with an oil strainer. 2 The radius of curvature of the gold steel of the spherical oil strainer is 83
The hermetic electric compressor according to claim 1, wherein the compressor is less than or equal to ty. 3. The closed type electric motor according to claim 1, wherein the spherical oil strainer is fixed to an oil strainer having a flange extending in the axial direction, and the flange is press-fitted into a hole in the frame. compressor.