JPH0114792Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a hermetic compressor.

A conventional hermetic compressor is explained with reference to Figs. 1, 2, and 3. In Fig. 1, 1 is a casing, 2 is a discharge pipe protruding from the casing 1, and high-temperature and high-pressure refrigerant is transferred from the discharge pipe 2 to a condenser. 3 and is sucked into the casing 1 through the capillary tube 4 evaporator 5 suction pipe 6 suction chamber 13, compressed, and discharged into the discharge pipe 2.
However, at that time,
The capacity of the hermetic compressor is controlled as follows.
That is, a free valve 15 for opening and closing the opening 14 is provided at the opening 14 for releasing the compressed gas refrigerant to the low pressure side from between the suction chamber 13 and the discharge chamber 12 of the shilling 17, and the free valve 15 is connected to the compressor. Control is achieved by introducing pilot pressure obtained by opening and closing electromagnetic valves 9 and 10 provided externally into the bypass reservoir 16 and opening and closing the bypass reservoir 16. Here, to explain the above-mentioned valve mechanism, the valve mechanism, as shown in Figs. 2 and 3,
The opening 14 provided in the lower bearing 19 and the lower bearing 19
An insertion hole 19A drilled in the insertion hole 19A, a valve retainer 18 press-fitted into the insertion hole 19A, a free valve 15, and a valve seat 30.
and gasket 31, when the bypass reservoir 16 is at low pressure, the free valve 15 is open, and when the bypass reservoir 16 is at high pressure,
In order to close the free valve 15, also close the gasket 3.
1 prevents high pressure gas from leaking into the cylinder 17 at this time.

In the hermetic compressor, since the valve retainer 18 is press-fitted into the insertion hole 19A, processing accuracy is required, and deformation is likely to occur due to press-fitting. () The valve retainer 18 falls off due to gas pressure. There was a problem.

This proposal addresses the above-mentioned problem, and includes a bypass opening in the upper bearing or lower bearing that forms the compression chamber that allows part of the compressed gas to escape from the middle of the compression chamber to the low-pressure side, and an opening for the bypass. In a hermetic compressor, the bearing is provided with a free valve that opens and closes the opening by switching pilot pressure acting as back pressure to high or low pressure, the bearing having a stepped hole communicating with the bypass opening. established,
A gasket and a valve seat are fixed to the bottom of the small diameter part on the opening side of the stepped hole via a ring, and the free valve is inserted into the inside of the ring, and the large diameter part of the stepped hole on the side opposite to the opening is fixed. The present invention relates to a hermetic compressor characterized in that a valve-cum-ring retainer that holds down the free valve and the ring is tightened and fixed with bolts, and its purpose is to improve the machining accuracy of the valve-cum-ring retainer and the stepped hole. is not required, reducing manufacturing costs. There is no need to press-fit the valve/ring holder, and deformation due to press-fitting of the valve/ring holder can be prevented. Prevents the valve/ring retainer from falling off due to gas pressure. Another object of the present invention is to provide an improved hermetic compressor that can prevent wear due to the free valve in the small diameter portion on the opening side of the stepped hole.

Next, the hermetic compressor of the present invention will be explained using an embodiment shown in FIGS. 4 and 5. 190 is a lower bearing;
4 is a bypass opening provided in the lower bearing 190, 191 and 192 are stepped holes provided in the lower bearing 190 and communicating with the bypass opening 14; 192 is a small diameter portion on the opening side, and 192 is a large diameter portion on the side opposite to the opening. 15 is a small diameter portion 1 on the opening side of the stepped holes 191 and 192 that is closer to the bypass opening 14.
The free valve 180 is fitted into the stepped hole 191, 192, and the valve/ring holder 180 is fitted into the large diameter part 191 on the opposite opening side far from the bypass opening 14. is designed to hold down the free valve 15 and a ring 200 described later. In addition, 193 is the lower bearing 190
A bolt hole 200 provided in the opening is a ring inserted into the small diameter portion 192 on the opening side, and the ring 200 fixes the gasket 31 and the valve seat 30. 201 is screwed into the bolt hole 193 to hold the valve/ring retainer 180 on the lower bearing 1.
This is a bolt that is tightened and fixed to 90. The valve/ring retainer 180 has a shape that allows the free valve 15 to operate reliably, and has a passage having a cross-sectional area sufficient to pass the gas refrigerant.

In this case, the lower bearing 190 (or upper bearing) that forms the compression chamber has a bypass opening 14 for releasing a part of the compressed gas to the low pressure side from the middle of the compression chamber, and In a hermetic compressor provided with a free valve 15 that opens and closes the bypass opening 14 by switching pilot pressure acting as back pressure to high pressure or low pressure, the bypass opening 1 is attached to the bearing 190.
Stepped holes 191, 192 communicating with 4 are provided, and the opening side small diameter portion 192 of the stepped holes 191, 192 is provided.
A gasket 31 and a valve seat 30 are fixed to the bottom of the valve via a ring 200, and the free valve 15 is fitted into the ring 200, and the stepped hole 19 is
A valve/ring retainer 180 that holds down the free valve 15 and the ring 200 is tightened and fixed to the large diameter portion 191 on the side opposite to the opening of No. 1,192 with bolts 201. () Valve/ring retainer 180 and stepped hole 1
Since machining accuracy is not required for 91 and 192, manufacturing costs can be reduced. () Furthermore, there is no need to press-fit the valve/ring retainer 180, and deformation due to press-fitting of the valve/ring retainer 180 can be prevented. ()
Further, as described above, the valve/ring retainer 180 is tightened and fixed by the bolt 201, and it is possible to prevent the valve/ring retainer 180 from falling off due to gas pressure.

() Also, since the ring 200 for fixing the gasket 31 and the valve seat 30 is interposed between the small diameter portion 192 on the opening side of the stepped holes 191, 192 and the free valve 15, the free valve 15 on the small diameter portion 192 on the opening side
This has the effect of preventing wear due to

[Brief explanation of the drawing]

Figure 1 is a system diagram when a conventional hermetic compressor is used in a refrigeration system, Figure 2 is a vertical side view of the hermetic compressor, and Figure 3 is an enlarged view of the lower bearing part of the hermetic compressor. FIG. 4 is a vertical side view showing the lower bearing portion of the hermetic compressor according to the present invention, and FIG. 5 is a bottom view seen from the direction of arrow V in FIG. 4. 14... Bypass opening, 15... Free valve, 30... Valve seat, 31... Gasket, 180
...Valve/ring retainer, 190...Lower bearing, 1
91, 192...Stepped hole, 191...Large diameter part on the opposite opening side, 192...Small diameter part on the opening side, 200...
...Ring, 201...Bolt.

Claims (1)

[Scope of utility model registration request] The upper bearing or the lower bearing that forms the compression chamber has a bypass opening that releases part of the compressed gas from the middle of the compression chamber to the low pressure side, and a pilot pressure that acts as back pressure on the bypass opening. In a hermetic compressor equipped with a free valve that opens and closes the opening by switching to a low pressure, the bearing is provided with a stepped hole that communicates with the bypass opening, and a small diameter portion on the opening side of the stepped hole is provided. A gasket and a valve seat are fixed to the bottom of the valve through a ring, and the free valve is inserted into the inside of the ring, and the free valve and the ring are held in the large diameter portion of the stepped hole on the side opposite to the opening. A hermetic compressor characterized by a ring retainer that is tightened and fixed with bolts.