JPS5898692A - Rotary compressor - Google Patents

Abstract

PURPOSE:To reduce an electric power consumption by a method wherein overheated gas, flowing into an evaporator from the compressor while it is stopped, is intercepted to reduce the temperature rise of the evaporator. CONSTITUTION:The gas of refrigerant medium, discharged into an enclosed vessel 2, is flowed into second discharging port 21 and is flowed to the condenser of a refrigerating cycle from a discharging pipe 22 through an inflow path 23. A pressure in a cylinder chamber 11 and the same in the enclosed vessel 2 become equal by the stop of a compressing element 4 and a discharge valve 15 closes the first discharging port 14 and the second discharging port 21. Accodingly, the inflow of the overheated refrigerant medium gas through the cndenser of the refrigerating device is prevented while the compressor is stopped to prevent the temperature rise of the evaporator, therefore, the electric power consumption may be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotary compressor that improves the motion efficiency of a refrigeration system.

In the Japanese market, it is at its peak in terms of commercialization, mainly in room air conditioners. On the other hand, the mainstream of small compressors used in household refrigerators and the like was the reciprocating type. This is because the compressor is small, ie, has a small cylinder volume, so if it is made rotary, leakage loss from the cylinder, piston, etc. that constitute the compression element is large, and its efficiency is lower than that of the reciprocating type. However, with recent improvements in processing technology, the leakage loss has become smaller and efficiency has been greatly improved, and rotary compressors are now being used in small compressors such as household refrigerators.

However, the efficiency of a rotary compressor is significantly different between the efficiency evaluated under continuous operation conditions such as a calorimeter test and the efficiency evaluated by incorporating it into a home refrigerator according to the "Power consumption test for home refrigerators" according to JIS 09607. There was found. To give an example of this, the energy efficiency rate in a compressor calorimeter test (
1! :I! :R) is about 1.2 times that of the reciprocating type for the rotary set, which is 3/, -mi. However, in the power consumption test of a household refrigerator, the power consumption of the rotary set is about 1.2 times that of the reciprocating type. This is a reduction of about 6 inches, and the actual situation is that the efficiency at the time of mounting is greatly reduced. The cause of this is that while the compressor, whose temperature is controlled by a thermostat, is stopped, a large amount of high-temperature, high-pressure gas in the closed container flows into the cylinder chamber through the mechanical seal of the compression element of the compressor, and the superheated gas that flows into the cylinder is It flows through two channels: one flows from the chamber to the evaporator, and the other flows from the sealed container to the condenser to the capillary tube to the evaporator, which heats the evaporator, resulting in a heat load on the refrigerator. This results in an increase in the operating rate, an increase in power consumption, and a decrease in operating efficiency. In particular, the rotary set is a large capacity sealed container with high temperature and high pressure inside, and the amount of heat flowing into the evaporator is also very large. In order to eliminate the above-mentioned drawbacks, a common method is to provide a solenoid valve or the like in the discharge pipe and suction pipe of the compressor, but this method is expensive, and the solenoid valve itself consumes electricity, resulting in a decrease in efficiency. It has drawbacks such as a decrease in reliability, such as occurrence of malfunction and increased risk of leakage due to an increase in the number of welded parts. In addition, even if a solenoid valve is installed on either the discharge pipe or the suction pipe, 2
It has also been confirmed that there is almost no effect because one side of the flow path is established.

In view of the above points, the present invention blocks the superheated gas flowing from the compressor to the condenser and suction line when the compressor is stopped, thereby enabling highly efficient operation even when used in small refrigeration equipment such as household refrigerators. The purpose of the present invention is to provide a rotary compressor that does the following:

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. 1 is a so-called rolling piston type rotary compressor, and an electric element 3 is installed in a sealed container 2''.
The compression element 4 is press-fitted and fixed. A shaft 6, which is directly connected to the electric element 3 and has an eccentric portion 6&, is attached to the axis of the hollow cylindrical cylinder 6 so that its axes coincide with each other. The remote part of the roller 7 provided in the shirt has a small gap with the inner surface of the cylinder 6 to maintain airtightness.

A narrow groove 8 is provided in the cylinder 5, and a flat plate-shaped vane e is slidably accommodated in the narrow groove 8. The vane 9 is urged by a spring 10 to tightly contact the roller 7, and the cylinder chamber 11 is It is divided into high pressure side and low pressure side.

In order to constitute the cylinder chamber 11, side plates 12 and 13 are firmly attached to both sides of the cylinder 5. The side plate 12 has a first discharge hole 14. A first discharge valve device 17 including a discharge valve 15 and a valve stop 16 is provided, and the refrigerant gas from the cylinder chamber 11 is once discharged into the closed container 2. On the other hand, the suction passage 18 of the cylinder 6 is provided with a low-pressure side check valve 19 that is open when refrigerant gas is being sucked and closed in the opposite direction. 2o is a second discharge valve device, which includes a second discharge hole 21 formed in the side plate 12 in parallel with the first discharge hole 14, and a discharge pipe 22 (discharge path) extending outside the closed container 2.
an outflow path 23 communicating with the second discharge hole 21 and substantially perpendicular to the second discharge hole 21;
It is composed of a discharge valve 16 that also serves as the first discharge valve device 17, and a valve stop 16 that also serves as the first discharge valve device 1. In particular, the second discharge hole 21 is connected to the first discharge valve as described above. The first discharge hole 1 is connected between the hole 14 and the bolt 24 that fixes the discharge valve 16 and the valve stop 16.
They are located close to number 4. and discharge valve 1
When the discharge valve 16 closes the first discharge port 14, the second discharge hole 21 is also closed, and when the discharge valve 16 opens the first discharge hole 14, the second discharge hole 21 is also opened at the same time. . A condenser, a capillary tube, and an evaporator (all not shown) are connected between the discharge pipe 22 and the suction side of the rotary compressor 1 to form a refrigeration cycle.

Next, we will discuss the effect. First, while the compressor 1 is in operation, the pressure in the suction passage 18 provided in the cylinder 6 becomes low due to the compression action of the compression element 4, and the low-pressure side check valve 19 becomes open. Further, when the pressure of the refrigerant gas compressed in the cylinder chamber 11 by the compression action of the compression element 4 becomes 7 l 2 greater than the pressure in the closed container 2, the discharge valve 16 is set to the valve stop 16 due to the differential pressure. The first discharge valve device 17 is opened and the compressed refrigerant gas is discharged into the closed container 2. Second
The discharge valve 16 of the discharge valve device 20 is the first discharge valve device 1
7, so when the pressure inside the cylinder chamber 11 becomes higher than the pressure inside the closed container 2 and comes into close contact with the valve stop 16, the second discharge valve is opened as shown in FIG. The device 2o is in an open state like the first discharge valve device 17. Therefore, the refrigerant gas discharged from the closed container 2 flows into the second discharge hole 21, passes through the outlet passage 23, and flows from the discharge pipe 22 to a condenser (not shown) of the refrigeration cycle.

Next, let's talk about stopping. When the compression element 4 is stopped, high-pressure refrigerant gas gradually flows into the cylinder chamber 11 through a small gap between the cylinder 6 and the side plate 12.13, so the low-pressure side check valve 19 provided in the suction path 18 closes. This prevents superheated refrigerant gas from flowing into the evaporator (not shown) of the refrigeration cycle, thereby preventing a temperature rise during the evaporator.

Further, by stopping the compression element 4, the pressure in the cylinder chamber 11 and the pressure in the closed container 2 become equal, and the discharge valve 16 opens the first discharge hole 14 and the second discharge hole 21, as shown in FIG. Close the circuit. Therefore, the superheated refrigerant gas while the compressor 1 is stopped is prevented from flowing into the evaporator through the condenser of the refrigeration system, thereby preventing the temperature of the evaporator from rising.

As described above, the present invention provides a low-pressure side check valve in the suction passage, and a second discharge valve device that opens when the compressor is operating and closes when the compressor is stopped in synchronization with the first discharge valve device of the compression element. Because of this, when the compressor is stopped, the capacitor is removed from the compressor.

and the superheated gas flowing into the evaporator via the suction line. Therefore, compared to conventional products, the temperature rise of the evaporator is smaller and the operating rate is reduced.

In addition to reducing power consumption, there is no need for a conventional solenoid valve, which saves power, and reduces the risk of malfunctions and leaks due to an increased number of welded parts, improving reliability. In addition, the second discharge valve arrangement is installed in parallel with the first discharge valve device, and the discharge valve is also used as the first discharge valve device, so there is no increase in the number of parts and assembly is easy. can get.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a rotary compressor according to an embodiment of the present invention, Fig. 2 is a sectional view taken along the line T'' in Fig. 1, and Fig. 3 is a sectional view taken along the line T'' in Fig. 2. FIG. 4 is a sectional view showing the compressor in a stopped state corresponding to FIG. 3. 4...Compression element, 11...Cylinder chamber, 16...Discharge 11 arm club, 17...
First discharge valve device, 18... Suction passage, 19...
...Low pressure side check valve, 20...Second discharge valve device, 22...Discharge pipe (discharge path). Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure a Figure 3 Figure 4 Member 23

Claims (2)

[Claims] (1) A low-pressure side check valve is provided in the suction path of the compression element, and a first discharge valve device for discharging compressed refrigerant gas into a closed container is provided on a side plate constituting a cylinder chamber of the compression element, and the closed container a second discharge valve device for discharging refrigerant gas therein to a discharge passage, and the second discharge valve device is configured to open and close in synchronization with the first discharge valve device. (2) The rotor 11-compressor according to claim 1, wherein the discharge valve for opening and closing the discharge hole of the second discharge valve device also serves as the discharge valve of the first discharge valve device.