JPS63140885A - Enclosed type rotary compressor - Google Patents

Abstract

PURPOSE:To easily obtain a pressure balance by providing a communicating hole communicating the intake hole of a cylinder and the space in an enclosed container and providing a pressure balance controllable valve mechanism in the communicating hole. CONSTITUTION:A communicating hole 15 is provided communicating the intake hole 12 of a cylinder 8 formed with an upper bearing end plate 6 and a lower bearing end plate 9 supporting a crank shaft 5 and closing both end openings of the cylinder 8 and the space in an enclosed container 1. A valve mechanism having a coil spring 16, a valve 17, and a valve guide 18 is provided in this communicating hole 15. Accordingly, the valve 17 is pushed up when the difference between the pressure in the enclosed container 1 and the pressure in the intake hole becomes the predetermined value, thus a pressure balance can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a pressure balance control mechanism for a hermetic rotary compressor constituting a refrigeration cycle.

2. Description of the Related Art Examples of conventional hermetic rotary compressors are shown in FIGS. 4 to 6.

A conventional hermetic rotary compressor includes an electric motor element 4, a crankshaft 5 driven by the electric motor element 4, a piston 7 rotatably fitted to the crankshaft 5, and a piston housed in a hermetically sealed container 1. a cylindrical cylinder 8, a partition plate 1 whose tip touches the piston 7 and makes reciprocating motion;
0, a cylindrical coil spring 13 that biases the partition plate 8, an upper bearing end plate 6 and a lower bearing end plate 9 that support the crankshaft 5 and close the entrances at both ends of the cylinder 8.

It has a configuration in which a compressor element 11 is housed, and is connected to a refrigeration cycle.

The operation of the refrigeration cycle and hermetic rotary compressor constructed as above will be explained below.

The compressor element 11 is driven by the electric motor element 4 to perform a compression movement, and the compressed refrigerant is discharged into the refrigeration cycle from the discharge vibrator 14 of the hermetic rotary compressor. Figure 4 is a general refrigeration cycle diagram. Compressed refrigerant gas passes through the condenser 20 of the refrigeration cycle, is condensed, expands in the capillary tube 21, becomes a low-temperature, low-pressure refrigerant, and absorbs heat in the evaporator 22. and returns to the suction side of the compressor.

Problems to be Solved by the Invention As mentioned above, when the compressor is operating, the condenser 20 of the refrigeration cycle is at high pressure and the evaporator 22 is at low pressure, and when the compressor 20 is stopped, the pressure of the refrigeration cycle is low. Balance begins. That is, high-pressure gas in the condenser 20 flows into the evaporator 22 through the capillary tube, and the refrigerant moves so that the pressure in the condenser 20 and the pressure in the evaporator 22 become the same.

However, in a normal refrigeration cycle, it takes 3 to 5 minutes for the pressure balance to be completed after the compressor 20 is stopped, which limits the restartability of the compressor 20. Conventionally, measures have been taken to improve the restartability of pressing looms, such as increasing the starting torque of the electric motor and continuously operating the heat exchanger fan even when the compressor is stopped.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a communication hole that communicates the suction hole of the cylinder with the space inside the sealed container, and provides a valve mechanism that can control pressure balance in the communication hole. It is something.

Function The present invention has the above-mentioned configuration, so that when the pressure difference between the syringe suction side pressure and the pressure inside the closed container becomes about 4Kg/WfG,
Since the valve opens, it is possible to bypass the high-pressure side and the low-pressure side within the compressor, making it possible to shorten the pressure balance time of the refrigeration cycle and improving the restartability of the compressor.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 4.

First, the schematic structure of a hermetic rotary compressor will be explained with reference to FIGS. 1 to 3. FIG. 3 is a detailed diagram of the pressure equalizing valve mechanism.

In the figure, a closed container 1 includes an electric motor element 4 and a crankshaft 5 driven by the electric motor element 4.
A piston 7 rotatably fitted to the piston 7, a partition plate 10 whose tip contacts the piston 7 and makes reciprocating motion, a cylindrical coil spring 13 that biases the partition plate 10, and a cylinder 8 that supports the crankshaft 5 and supports the cylinder 8. It is formed by an upper bearing end plate 6 and a lower bearing end plate 9 that close the openings at both ends, and is provided with a communication hole 15 that communicates the suction hole 12 of the cylinder 8 with the space inside the sealed container 1, and a coil spring 16, a valve 17, and a valve guide. A valve mechanism having 18 is provided in the communicating hole.

The operation of the hermetic rotary compressor constructed as above will be explained below. FIG. 4 is a general refrigeration cycle diagram.

A driving force is transmitted from the electric motor element 4 to the compressor element 11, which performs a compression movement, and the compressed refrigerant is discharged from the compressor discharge pipe 14 to the refrigeration cycle. The compressed refrigerant gas passes through the condenser 20 of the refrigeration cycle, is condensed, expands in the capillary tube 21, becomes a low-temperature, low-pressure refrigerant, absorbs heat in the evaporator 22, and returns to the suction side of the compressor 19.

If the compressor 19 operating in this state stops,
The refrigerant is a high-pressure, high-temperature condenser 20 and a capillary tube 21.
The pressure in the condenser 20 and evaporator 22 is balanced as it flows through the evaporator 22, but in order to speed up this balancing time, the suction hole 12 of the cylinder 8 and the space inside the closed container 1 are communicated. A valve mechanism is provided in the hole 15 that has been made.

In this valve mechanism, when the difference between the pressure inside the sealed container 1 and the pressure inside the suction hole becomes about 4 to 9/rd G, the valve 17 is pushed up by the coil spring 16, the inside of the sealed container is communicated with the suction hole, and the pressure is released from this communication hole. This enables balance and shortens the balance time.

Effects of the Invention As described above, the present invention can easily balance the pressure inside the condenser and the pressure inside the evaporator, increasing the degree of freedom in designing the compressor motor and also increasing the degree of freedom in designing the refrigeration cycle. This makes it possible to remove restrictions when starting the compressor.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a hermetic rotary compressor according to an embodiment of the present invention, FIG. 2 is a plan view of compressor elements of the same compressor, and FIG. 3 is a cross-sectional view of essential parts showing the balance control valve section. 4 is a diagram of a general refrigeration cycle, FIG. 5 is a longitudinal sectional view of a conventional hermetic rotary compressor, and FIG. 6 is a plan view of compressor elements of the same compressor. 1... Airtight container, 4... Electric motor element,
5... Crankshaft, 6... Upper bearing end plate, 7... Piston, 8... Cylinder 19... Lower bearing end plate. , 10... Partition plate, 12... Suction hole, 13... Coil spring, 14... Discharge pipe, 15...
Communication hole, 16... Coil spring, 17...
・Valve, 18... Valve guide. ) Name of agent Patent attorney Kano Nakao and 1 other person

Claims (1)

[Claims] In a sealed container, an electric motor element, a crankshaft driven by the electric motor element, a piston rotatably fitted to the crankshaft, and a cylindrical cylinder housing the piston and having a suction hole; a partition plate that makes reciprocating motion with its tip in contact with the piston and divides the interior of the cylinder into a refrigerant suction chamber and a compression chamber; a spring that biases the partition plate from behind the partition plate; and a spring that supports the crankshaft and supports the cylinder. A pressure equalizing valve mechanism that houses upper and lower bearing end plates that close openings at both ends of the cylinder, has a hole that communicates the suction hole of the cylinder with the internal space of the sealed container, and has a coil spring, a valve, and a valve guide in the communication hole. A closed rotary compressor equipped with