JPS61108888A - Enclosed type rotary compressor - Google Patents

Abstract

PURPOSE:To eliminate the necessity for an expensive solenoid valve while consume no electric power at all also for opening and closing a valve, by providing a built-in delivery gas cut mechanism, which uses a ball operated by the internal pressure in an enclosed case, in a compression mechanism. CONSTITUTION:A delivery gas cut mechanism 11, providing in its one end a circuit 13 air-tightly connected with a suction circuit 10 of a compression mechanism 3 and in the other end adjacently a delivery circuit port 14 opened inside an enclosed case 2 and a gas delivery port 15, provides inside a ball 16 performing valve action. In this constitution, while a compressor is in operation, if high pressure and high temperature gas jetted into the enclosed case 2 passes through the delivery circuit port 14 being jetted, the mechanism, both lifting the ball 16 and attaching it to a valve seat 13a by attractive force of the suction circuit 13, delivers the gas through the gas delivery port 15. Next the compressor, if its operation is stopped, ceases jetting of the gas, and the ball 16 drops by its dead weight to a side of the gas delivery port 15, closing a circuit to the gas delivery port 15.

Description

Detailed Description of the Invention: Industrial Field of Application The present invention is a hermetic rotary compressor used in a refrigeration cycle. Regarding the technology built into the machine.

Structure of a conventional example and its problems A conventional rotary compressor 1 has a sealed case 2, a compression mechanism 3, an electric motor 4 as shown in FIG. 2, and a conventional compressor using the solenoid valve as shown in FIG. An explanatory diagram of the refrigeration cycle in use is shown. 1 is a hermetic rotary compressor,
6 is a condenser, 6 is a solenoid valve, 7 is a capillary tube,
8 is an evaporator, and 9 is a reverse valve.

The reason why the electromagnetic valve 6 is required is that when the compressor is stopped, high-pressure, high-temperature gas in the sealed case 2 passes through the capillary tube 7 and leaks into the evaporator 8.

Since the gas at this time has a lower pressure and a smaller amount than when the compressor is operating, it does not evaporate in the evaporator 8, but the evaporator 8 is heated and heat loss occurs. The solenoid valve 6 is required to prevent this heat loss from occurring.The conventional solenoid valve 6 is operated by a solenoid coil.

Because a discharge gas cut valve was used, assembling and lowering the refrigeration cycle was extremely complicated and required a lot of man-hours, and the valve had to be opened while the compressor was running. It was consuming power to operate. However, it was expensive due to the large number of component parts.

When conventional solenoid valves are installed in refrigeration systems, they have the drawbacks mentioned above.

Purpose of the Invention Therefore, in order to eliminate the above-mentioned drawbacks, the present invention provides a valve for preventing heat loss inside the compressor, thereby reducing the number of man-hours required for assembling a refrigeration cycle and brazing the valve. The purpose is to eliminate the need for power consumption and reduce material costs.

Structure of the Invention In order to achieve this object, the present invention has a built-in discharge gas cut pulp mechanism using a ball valve operated by the internal pressure of a sealed case inside the compression mechanism, thereby creating a system that is simple and inexpensive, without consuming electricity. It is a method that can reliably prevent heat loss.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. still,
The same parts as in the conventional example will be explained using the same reference numerals. In FIG. 1, 1 is a compressor main body, 2 is a closed case, and a compression mechanism 3 and an electric motor 4 are built inside the case.

1o is a suction circuit pipe that is airtightly fixed to the compression mechanism 3; 11B is a discharge gas cut mechanism provided in the bearing 12; one end is connected to the suction circuit 10 of the compression mechanism 3;
A circuit 13 is airtightly connected to the gas discharge circuit 13, and a discharge circuit port 14 and a gas discharge port 15 which are open in the sealed case 2 are provided adjacent to each other at the other end, and a ball 16 that acts as a valve is provided inside. ing.

17 is a discharge pipe airtightly connected to the discharge gas cut mechanism 11, 18 is a gas jet port of the compression mechanism,
The circuit 13 is provided with a valve seat 13a of a ball 16, and a bushing 19 having a valve seat 1.5a of the valve 16 forming the gas discharge port 15 is press-fitted into the discharge gas cut mechanism 11. has been done.

In the above configuration, while the compressor is in operation, high-pressure and high-temperature gas is ejected from the gas ejection port 18 into the sealed case 2 through the discharge circuit port 1.
4, the ball 16 is pushed up and the suction force of the suction circuit 13 causes the ball 16 to
It is attached to the valve seat 13a, forming one gas circuit, and gas is discharged to the refrigeration system through the gas discharge port 15 and the discharge pipe 17. - Next, when the compressor stops operating, the gas jetting stops and high pressure gas leaks from the cylinder etc. into the suction circuit 13, and the pressures in the circuit 13 and the discharge circuit port 14 become equal, and the ball 1
Due to its own weight, the ball 16 falls to the side of the gas discharge port 16, and is pressed against the valve seat 15a provided in the gas discharge port 15 by the shell internal pressure, closing the circuit to the gas discharge port 15, and thus to the refrigeration system. The high-pressure, high-temperature gas discharge is completely canted, thereby preventing the occurrence of heat loss in the refrigeration system. Therefore, when the compressor of the above embodiment is assembled into a refrigeration system, the conventional solenoid valve becomes unnecessary, the many man-hours required for assembly and brazing can be saved, and no electricity is required to open and close the valve. This provides many practical effects, such as preventing heat loss caused by high-pressure, high-temperature gas flowing into the refrigeration system when the compressor is stopped.

Effects of the Invention As is clear from the above explanation, the present invention eliminates the need for an expensive solenoid valve by incorporating a discharge gas capping mechanism using a ball operated by the internal pressure of a sealed case into the compression mechanism. No power consumption is required to open or close the
This has the effect of reducing the number of steps needed to assemble the refrigeration system and preventing heat loss in the refrigeration system.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a hermetic rotary compressor showing an embodiment of the present invention, FIG. 2 is a sectional view of a conventional hermetic rotary compressor, and FIG. 3 is a diagram of a conventional refrigeration system. 2... Sealed case, 3... Compression mechanism, 4
...Electric motor, 16...Ball valve, 1
3a, 15a... Valve seat, 11-... Discharge gas cut mechanism.

Claims (1)

[Claims] A hermetic rotary compressor is made up of a hermetic case, a compression mechanism, and an electric motor, and has a built-in discharge gas cut mechanism in which the compression mechanism is equipped with a ball valve and a valve seat that are operated by the internal pressure of the hermetic case.