JPH0823354B2 - Hermetic rotary compressor - Google Patents

Description

The present invention relates to a hermetic rotary compressor used in a refrigerator or the like.

(B) Conventional technology Conventionally, a refrigerator equipped with this type of hermetic rotary compressor prevents a high-temperature high-pressure gas refrigerant from flowing back from the compressor to the cooler due to a pressure difference when the compressor is stopped. As disclosed in Japanese Utility Model Publication No. 61-46367, etc., in order to prevent temperature rise and improve the starting characteristics at restart, check with the low-pressure side pipe between the compressor and the cooler. While the valve is provided, a gas reservoir is provided in the pipe between the check valve and the compressor.

(C) Problems to be Solved by the Invention However, according to the above configuration, since the check valve and the gas reservoir are attached to the refrigerant pipe outside the compressor by brazing, not only the number of parts increases but also the refrigerator. However, there is a problem that the piping structure becomes complicated due to the restriction of the space in the machine room, and the mounting work becomes complicated.

The present invention has been made in view of the above circumstances, and provides a hermetic rotary compressor capable of further improving the internal temperature of the refrigerator and the starting characteristics without increasing the number of parts or complicating the mounting work. With the goal.

(D) Means for Solving the Problems The present invention relates to an electric motor unit, a compressor unit driven by the electric motor unit, a gas suction passage provided so as to communicate with a cylinder bore of the compressor unit, and A check valve provided in the middle of the passage and a volume provided in the middle of the gas suction passage between the check valve and the cylinder bore are built in a sealed case.

(E) Operation In the hermetic rotary compressor of the present invention having the above-mentioned structure, the check valve provided in the gas suction passage prevents backflow of the high-temperature high-pressure gas to the cooler when the compressor is stopped, and prevents the temperature inside the refrigerator. Not only is it possible to prevent the pressure rise on the low pressure side when the compressor is stopped and shorten the pressure equilibration time between the high pressure and the low pressure, by not only preventing the rise in the pressure of the compressor but also significantly reducing the distance between the check valve and the cylinder bore. It is possible to speed up the start of restart. In addition, due to the volume provided between the check valve and the cylinder bore, during restart, the gas in the volume can be supplied to the cylinder bore to maintain the pressure equilibrium state for a long time until the compressor transitions to a stable state. The starting characteristics of can be improved. Not only that, the check valve and volume are installed by effectively utilizing the existing parts and space inside the sealed case, so the compressor and machine room are enlarged and the number of parts is increased.
Further, the piping structure is not complicated and the mounting workability can be improved.

(F) Example Hereinafter, an example of the present invention will be described with reference to the drawings.

Reference numeral 1 denotes a cylindrical hermetically sealed case 2, and an electric motor unit 3 at an upper part and a rotary compressor unit 4 driven by the electric motor unit at a lower part.
It is a hermetic rotary compressor that stores the. The compressor section 4 has a cylinder bore 5 and a cylinder block 7 having a suction hole 6 communicating with the bore therein, a compression chamber 8 formed by closing the bore of the block, and a bearing portion 10 for a rotary shaft 9. An upper frame 12 and a lower frame 13 having 11, a roller 15 fitted on the eccentric portion 14 of the rotating shaft 9 and eccentrically rotating in the compression chamber 8, and a compression chamber whose tip is constantly in pressure contact with this roller. It is composed of a vane 16 that divides the inside of the container 8 into a high pressure side and a low pressure side. Reference numeral 17 is a cup body that is fitted into the upper frame body 12 and forms a discharge chamber 18 therein. Reference numeral 19 denotes a volume formed by closing the lower frame 13 with the end plate 20 at the recess on the lower surface. The volume of this volume is the cylinder bore 5 for the reason described later.
The discharge volume is set to about 4 to 5 times. Reference numeral 21 denotes a check valve housed in the suction hole 6 of the cylinder block 7, which has a passage 22 on the outer circumference and which moves in the suction hole 6 by gas pressure and a valve formed on the end face of the sleeve 24. It is composed of a seat 25. Reference numeral 26 is a strainer press-fitted into the suction hole 6, one end of which is used as a valve retainer for the valve body 23. Numeral 27 is provided across both the cylinder block 7 and the lower frame 13 so that one end is opened to the suction hole 6 between the check valve 21 and the cylinder body 5 and the other end is opened to the volume 19. It is a communication hole. 28 is a suction pipe and 29 is a discharge pipe.

In the hermetic rotary compressor configured as described above, the check valve 21 opens the suction hole 6 as shown in FIG. 3 during operation, and the suction pipe 28 and the suction hole 6 are opened from the external refrigerant circuit (not shown). The gas introduced into the compression chamber 8 via the compression chamber 8 is compressed inside the chamber and then discharged to the outside of the machine via the discharge hole 30 of the upper frame 12, the discharge chamber 18, the internal space of the closed case 2 and the discharge pipe 29. Derived. At this time, since the volume 19 is a kind of resonance type silencer, it functions to reduce the pulsating sound of the inhaled gas. Further, when the compressor is stopped, as shown in FIG. 4, the check valve 21 blocks the suction hole 6 by the high pressure gas remaining in the compression chamber 8 and the high pressure gas does not flow back to the cooler. . At this time, the volume 19 is filled with high-pressure gas.

That is, according to the configuration of the present embodiment, the check valve 21 provided in the suction hole 6 simply prevents the high-temperature high-pressure gas from flowing back to the cooler when the compressor is stopped, and prevents the temperature inside the refrigerator from rising. Not only that, the distance between the check valve and the cylinder bore 5 is remarkably shortened by the small volume of the suction hole 6 to increase the pressure on the low pressure side when the compressor is stopped (roller in the compression chamber 8). The pressure rise due to the high-pressure gas leaking from the seal portion of the vane 16 and the vane 16) can be accelerated, the time required for the equilibrium of the standing forces between the high pressure and the low pressure can be shortened, and the start-up at the time of restart can be accelerated. Further, although the volume 19 provided between the check valve 21 and the cylinder bore 5 increases the volume between the check valve 21 and the bore 5, the effect of the above-mentioned rising characteristic is somewhat lost, but the compression is performed at the time of restart. The gas in the volume can be supplied into the cylinder bore 5 to maintain the pressure equilibrium state for a long time until the machine shifts to a stable state, and the starting characteristics at the time of restart can be improved. Not only check valve 21 and volume 19
Is installed by effectively using the existing parts of the compressor unit 4 (for example, the sleeve 24 and the upper and lower frame members 12 and 13) and the space inside the closed case 2, so that the compressor and the machine room are enlarged. Or
Mounting workability can be improved without increasing the number of parts or complicating the piping structure. Furthermore, since the volume 1 functions as a kind of resonance silencer,
The pulsation of gas can be prevented and noise can be reduced, and the low temperature gas that circulates one after another can be sent into the cylinder bore 5 as it is, and the suction amount of the suction gas is not so affected, so that the capacity is lowered. Nor. If the volume of the volume 19 is too large, the time required for pressure equilibrium will be delayed, and if it is too small, the pressure equilibrium state at restart will not be maintained for a long time. About 5 times is good.

Further, FIGS. 6 to 10 show another embodiment, and FIGS. 6 to 8 show a check valve 32 constituted by a ball valve 30 and a cylindrical valve retainer 31, FIG. 9 and FIG. FIG. 10 shows that the volume 33 is arranged as a separate type resonance silencer in the space on the side of the cylinder block 34, and the communication pipe 35 is connected to the suction hole 38 between the check valve 36 and the cylinder bore 37. All of these have the same effects as those of the embodiment shown in FIGS. 1 to 5.

(G) Effects of the Invention As described above, according to the present invention, it is possible to further improve the internal temperature of the refrigerator and the starting characteristics without increasing the number of parts and complicating the mounting work. A low-noise compressor can be provided.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a hermetic rotary compressor showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA in FIG. 1, and FIGS. 3 and 4 are check valves. Fig. 3 is a cross-sectional view of the
FIGS. 6 to 10 show other embodiments, FIGS. 6 and 7 are cross sectional views of the check valve, and FIG. 8 is C of FIG. -C sectional view in the section, Fig. 9 is a vertical sectional view of the main part of the hermetic rotary compressor, and Fig. 10 is a sectional view.
It is sectional drawing in the DD section of a figure. 2 ... Airtight case, 3 ... Electric motor part, 4 ... Compressor part,
5 ... Cylinder bore, 6 ... Suction hole, 7 ... Cylinder block, 19,33 ... Volume, 21,32,36 ... Check valve, 2
7 ... Communication hole.

Claims (1)

[Claims] 1. A motor unit, a compressor unit driven by the motor unit, a gas suction passage provided so as to communicate with the inside of a cylinder bore of the compressor unit, and a reverse passage provided in the middle of the passage. A hermetic rotary compressor characterized in that a stop valve and a volume provided midway in the gas suction passage between the check valve and the cylinder bore are incorporated in a hermetic case.