JPS6093194A - Seal type compressor - Google Patents

Abstract

PURPOSE:To prevent deformation of bearing due to reduction of wall thickness in bolt clamping by reducing pressure loss by forming a valve chest in a valve cover by making a discharge valve a free valve and providing a cylindrical member whose one end is open so as to surround the free valve. CONSTITUTION:A free valve 20 is disposed on a discharge port 11 of a main bearing 6. A valve chest forming member 21 is provided in a valve cover 13 so as to surround the free valve 20. The valve chest forming member is cylindrical with open one end, and a discharge port 22 is formed on the side wall and a supporting projection 23 engaging a back-up spring 24 of the valve 20 and used as a stopper of the free valve 20 is formed on the upper wall. Then no broad step portion is required on the bearing unit and deformation of the bearing 6 can be prevented in bolt clamping.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a hermetic compressor incorporated in, for example, a room cooler, and particularly relates to a cylinder mechanism designed to suppress noise and improve reliability.

[Technical background of the invention]

As shown in FIG. 1, this type of hermetic compressor has an electric motor 2 provided inside and above a hermetic casing 1.
A large diameter portion 4 integrally formed at the lower end of the shaft 3 extending downward from
A main bearing 6 and a sub-bearing 7 of the compression bag [S] are provided to sandwich the compression bag [S].

As shown in FIG. 2, the compression device 5 includes a main bearing 6. It has a secondary bearing 7 and a cylinder 8 located between them, and the cylinder 8 is formed by the cooperative action of a roller 9 fitted onto the large diameter portion 4 and a blade 10 that comes into elastic contact with the roller 9.
A compression chamber is formed inside. On the other hand, a discharge boat 11 is provided at an appropriate position of the main bearing 6, and this discharge boat 11
A discharge valve 12 made of a reed valve is disposed in the discharge valve 12 . A substantially cylindrical pulp cover 13 is attached to cover the area of the main bearing 6 including the discharge valve 12.

As shown in FIG. 3, the discharge valve 12 is attached to the main bearing 6 via a bolt 14 by a valve stopper 12a having a screw hole at one end.

[Problems with background technology]

However, in the above type of hermetic compressor, the discharge valve has one end fixed or is a closed valve, so even if the valve opens, it is difficult for gas to flow to the bolt side, resulting in increased loss and There is a problem in that the step in the valve shape causes deformation of the bearing due to uneven wall thickness when tightening the bolt, resulting in abnormal wear of the bearing.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide a hermetic compressor that uses a free valve as a discharge valve and is easy to assemble and achieves low noise and high reliability. do.

[Summary of the invention]

The present invention configures the discharge valve as a free valve, surrounds the free valve with a cylindrical member with an opening at one end defining a valve chamber, facilitates centering of the free valve, and simplifies assembly. Noise is reduced by defining a pulp chamber inside.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 4, the same parts 41 as in FIG. 2 are given the same reference numerals.

In FIG. 4, reference numeral 20 denotes a free valve, and this free valve 20 is arranged in the discharge boat 11 of the main bearing 6. A pulp chamber forming member 21 is provided within the pulp cover 13 so as to surround the free valve 20.

The valve chamber forming member 21 has a cylindrical shape with one end open, and has a discharge hole 22 formed in the side wall and a support protrusion 23 projecting inwardly formed in the wall. The support protrusion 23
supports the coiled backup spring 24 and also acts as a stopper for the free valve 20 that moves up and down. The backup spring 24 is
It is disposed in a valve chamber 25 formed within the pulp chamber forming member 21 (3), and the free valve 2o is brought into elastic contact with the discharge boat 11.

On the other hand, the upper surface of the pulp chamber forming member 21 and the pulp cover 1
A wave washer 26 is provided between the valve chamber 25 and the valve chamber 25 to bring the valve chamber forming member 21 into elastic contact with the main bearing 60 surface.
is defined.

Next, the effect will be explained.

To arrange the free valve 2o on the discharge boat 11 of the main bearing 6, first place the free valve 20 on the discharge port 11, then attach a backup spring to the support protrusion 23 of the valve chamber forming member 21, and The valve chamber forming member 21 is placed on the main bearing 6 so as to surround the free valve 20.

Next, after placing the corrugated washer 26 on the pulp chamber forming member 21, the pulp cover 13 is attached to the main bearing 6 by normal means. This completes the installation of the free valve 20.

FIG. 6 shows another embodiment of the present invention, in which the lower end of the pulp chamber forming member 30 is curled outward;
The coiled spring 32 is supported by this curled portion 31, and the valve chamber forming member 30 is held in elastic contact with the main bearing 6.

Although not shown, the valve chamber forming member 3o may of course be attached to a stopper made of a leaf spring having a notch at one end, and this stopper may be fixed to the bearing portion of the main bearing.

〔Effect of the invention〕

As described above, according to the present invention, there is no need to provide a wide step in the bearing section, so deformation of the bearing surface when tightening bolts is reduced, and a separate valve chamber is formed within the pulp cover. , it is possible to reduce pulp noise, and the valve assembly is simple.Furthermore, if the cylindrical member is supported by a coil spring, the cylindrical member moves upward when compressing the liquid, and there is a gap between the cylindrical member and the bearing part. Since a gap is formed and the gas-liquid mixed refrigerant is discharged from the gap, the valve mechanism can be protected.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional hermetic compressor, Fig. 2 is an enlarged sectional view of the same compressor, Fig. 3 is an explanatory diagram of the discharge valve section, and Fig. 4 is an enlarged sectional view of the compressor.
FIG. 5 is a cross-sectional view of a compression device portion of a hermetic compressor according to the present invention, FIG. 5 is an explanatory view of a discharge valve portion, and FIG. 6 is a diagram showing another embodiment of the present invention. 6...Main bearing, 11...Discharge port, 13...Valve cover, addition...Free valve, 21...Valve chamber forming member, 22...Discharge hole, 23...Support protrusion Department, U.
-・Backup spring, 25...Valve chamber. Representative Patent Attorney Noriyuki Chika (and 1 other person) (7) Figure 1 Figure 2 Figure 3 Figure 11 Figure 4 Figure 5 326 302332 0116

Claims (1)

[Scope of Claims] 1. An electric motor and a compression device directly connected to the electric motor are provided in a sealed casing, a discharge valve is disposed on a discharge boat provided on a bearing of the compression device, and a pulp cover is attached to the bearing. In the hermetic compressor, the discharge valve is a free valve, and a cylindrical member with one end open is provided to surround the free valve, and a pulp chamber is defined within the pulp cover. compressor. 2. The hermetic compressor according to claim 1, wherein the cylindrical member is fixed to a bearing via a spring device. 3. The hermetic compressor according to claim 1, characterized in that a backup spring for elastically supporting the free valve is attached to a support portion projecting inside the upper surface of the cylindrical member.