JPS6368796A - Rotary compressor - Google Patents

Abstract

PURPOSE:To prevent the deterioration of radiant efficiency of a condenser, by arranging a high pressure side inlet port at the side of a side plate, thereby preventing the lubricating oil attaching on the surface of the side plate from being induced by a high-temperature and high pressure gas flow to mix into a refrigerant circuit. CONSTITUTION:When a compressor 1 is run, high-temperature, high pressure gas in a closed vessel 2 is delivered into a condenser 31 and an evaporator 16, which form a refrigerant circuit, from an inlet port 23 and an outlet port 25 on the high pressure side in addition to a discharge pipe 25. At this time, mist of lubricating oil 32 contained in the gas attaches on the surface 6a of a side plate 6, runs down to around the high pressure side inlet port 23, and flows into the delivery pipe 24. As a result, the lubricating oil 32 is mixed into a liquid refrigerant, thereby lower radiating efficiency of the condenser 31. To cope with this, the high pressure side inlet port 23 is arranged at a side surface 6c of the side plate 6. With this contrivance, the inlet port is prevented from being situated on the surface 6a of the side plate 6, and consequently the lubricating oil 32 is prevented from flowing into the refrigerant circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a rotary compressor used in refrigeration equipment such as refrigerators and showcases.

[Conventional technology] In a device that cools the inside of a refrigerator by cycling a refrigerant, when the system is stopped, high-temperature refrigerant existing on the high-pressure side of the system flows into the low-pressure cooler and becomes a heat load, which reduces the power consumption of the device. The scenery increases. In order to prevent this phenomenon, a technique has been proposed in which the refrigerant passages on the low-pressure side and the high-pressure side are closed in the compressor when the compressor is stopped.

The above-mentioned compressor will be explained below with reference to FIG.

In FIG. 3, 1 is a rotary compressor, 2 is a closed container, 3 is an electric element such as a rotor 3a and a stator 3b, and 4 is a compression element. A crankshaft 5 is press-fitted into the rotor 3a and rotatably supported by bearings 8a and 7a formed on the side plates 6.7. 8 is a cylinder plate, and a rotor 9 is attached to the eccentric portion 6a of the crankshaft 6.
is rotatably mounted. 10 is the outer periphery of the rotor 9, the inner periphery of the cylinder plate 8, and the side plate e.

10a is a vane groove that partitions a compression chamber 11 defined by a ridge into a low pressure chamber 12 and a high pressure chamber 13. Numeral 14 is a bolt for fixing the side plate θ, 7 and cylinder plate 8 together. Reference numeral 16 denotes an evaporator 16, which is a suction pipe for guiding refrigerant gas to the compression chamber 11, and is press-fitted into the press-fit bore 1e of the side plate 6. The end surface of the end plate of the press-fit bore 16 on the cylinder plate 8 side constitutes a valve seat surface of a disk-shaped intake valve 17. The suction valve 17 is housed in the suction passage 18 that is connected to the press-fit bore 1e, is close to the vane 10, and communicates with the cylinder plate 8, and is equipped with a bias spring that always keeps the valve 17 closed with a weak force. 19 are stored. Further, 20 is a stepped portion that restricts the movement of the suction valve 17 when it is opened. 21 is the compression chamber 11
This is a discharge valve that discharges compressed refrigerant gas into the closed container 2 directly or via a precooler pipe (not shown) (FIG. 4). Reference numeral 22 denotes a high-pressure valve device, which is arranged at approximately the same height as the crankshaft 6.

This high pressure valve 22 includes a plurality of high pressure side inlet ports 23 extending in the axial direction of the crankshaft 6 on the side plate 6,
A high-pressure side outlet port 25 is provided which communicates with a discharge pipe 24 that penetrates the closed container 2. Further, the cylinder plate 28 is provided with a common valve cylinder 26 formed correspondingly to each of the adjacent ports 23, 25, and a low pressure side port 27 is formed at the bottom of this valve cylinder 26. . 28 is a disk-shaped high pressure valve, which can close the inlet and outlet ports 23, 25 on the negative side, and close the low pressure side port 27 on the other side. Reference numeral 29 denotes a bias spring that always biases the high pressure side inlet and outlet ports 23 and 25 to close. 3o is the cylinder plate 8 from the low pressure side port 27 and the opening 27a on one side plate 7 side.
It is a pressure conduction path that directly communicates with the low pressure chamber 12 of υ, and the opening 2 is
are closed by side plates 7.

The operation of the rotary compressor configured as above will be explained below.

FIG. 3 shows the stopped state, in which the low pressure valve 1, which acts as a reverse valve, is closed, and the high pressure valve 28 closes both the high pressure side inlet port 23 and the high pressure side outlet port 26 at the same time. ing. At this time, the high pressure valve 28 controls the pressure difference between the upstream and downstream of the high pressure side outlet port 26, that is, the evaporator 1
It is closed by the force due to the pressure difference between the condensation saturation pressure at the temperature of the cooling chamber where e is located and the saturation pressure at the temperature of the closed container 2, and by the slight force of the bias spring 29.

Therefore, the high-temperature, high-pressure gas in the closed container 2 is prevented from flowing to the condenser 31 and the evaporator 16, reducing the heat load entering the evaporator 1e.

Next, the startup time will be explained.

The crankshaft 5 is rotated by energization of the electric element 3, and the pressure in the low pressure chamber 12 of the compression chamber 11 is reduced. This pressure drop occurs even when there is a relatively rough clearance between the high pressure valve 28 and the valve cylinder 26 (for example, about 0.11 al).
Since the high-pressure side inlet port 23 is closed, this is reliably carried out in a very short time. This pressure drop naturally occurs in the pressure guide path 30.
．． Low pressure side port 27. The pressure inside the valve cylinder 26 decreases, and the pressure difference between the pressure inside the closed container 2 and the pressure inside the valve cylinder 26 acts on the high-pressure valve 28, and the dynamic pressure of the gas flow is strongly reduced at the high-pressure side inlet port 23. Taking this into consideration, the high pressure valve 28 closes the low pressure side port 27 against the force of the bias spring 29, completing the valve opening operation. On the other hand, the suction valve 17 is also opened, and normal cooling operation is performed.

Next, the operation when stopped will be explained.

When the crankshaft 6 stops rotating, the gas flow in the suction pipe 16 stops, and the suction valve 17 closes. Also cylinder 11
The oil seal that divides the inside into high pressure chamber 13 and low pressure chamber 12 is broken, and the high pressure gas inside the closed container 2 is leaked to the vane 10, for example.
The pressure inside the low pressure chamber 12 is increased by the clearance between the vane groove 10a and the like. This pressure increasing effect extends to the low pressure side port 27 through the pressure guiding path 30, and since the volume of the pressure guiding path 30 can be formed small, the pressure increasing time can be shortened. When the pressure inside the low-pressure side port 27 and the pressure inside the closed container 2 are equalized, the high-pressure valve 28 leaves the low-pressure side port 2 due to the force of the bias spring 29, and simultaneously opens the high-pressure side inlet port 23 and the high-pressure side outlet port 26. Close.

Therefore, while the compressor is stopped, the high pressure and high temperature gas in the closed container 2 is transferred to the condenser 31. This prevents it from flowing into the evaporator 1e.

Problems to be Solved by the Invention However, in the above configuration, when the compressor is in operation, the high-temperature, high-pressure gas in the closed container 2 flows through the high-pressure side inlet port 23. From the high pressure side outlet port 26 discharge pipe 24 to the condenser 3
1. When being discharged to the evaporator 16, the atomized lubricating oil 32 contained in the high-temperature, high-pressure gas adheres to the side plate surface 6b, flows down near the high-pressure side inlet port 23, and is attracted by the high-temperature, high-pressure gas flow. It flows into the discharge pipe 24. The lubricating oil 32 is
From the discharge pipe 24, the condenser 31. When the liquid refrigerant flows into the refrigerant circuit formed from the evaporator 16, lubricating oil is mixed into the liquid refrigerant and the liquid phase portion in the condenser 31 increases, so the effective heat radiation portion decreases and the heat radiation efficiency of the condenser 31 is significantly reduced. It will deteriorate. Furthermore, in the gas phase portion, thermal conductivity decreases due to lubricating oil adhering to the inner surface of the tube of the condenser 31, and heat radiation efficiency also deteriorates in this portion.

As a result, the condensing temperature rises, resulting in an abnormally high pressure on the high pressure side, which places an excessive load on the rotary compressor, making it impossible to perform normal cooling operation.
In addition, since the heat dissipation efficiency of the condenser 31 deteriorates, the original refrigerating capacity of the rotary 1 breechizer cannot be fully utilized, resulting in a decrease in the cooling capacity.

In view of the above problems, the present invention provides a rotary compressor that prevents lubricating oil from flowing into the refrigerant circuit and does not affect the heat dissipation efficiency of the condenser.

Means for Solving the Problems In order to solve the above problems, a rotary compressor of the present invention includes a closed container, a compression element and a motor housed in the closed container, and the compression element is connected to a crankshaft. a side plate having a bearing portion for pivotally supporting the rotor; a cylinder plate table rotatably housing the rotor; the side plate and the cylinder plate are overlapped to form a compression chamber;
A vane that partitions the compression chamber into a low pressure chamber and a high pressure chamber, and a suction valve and a discharge valve that communicate with the low pressure chamber and the high pressure chamber, respectively, and that function as a check valve and are disposed in close proximity to the vane. , a high-pressure side inlet port that constantly communicates with the inside of the closed container;
A high-pressure side outlet port that constantly communicates with the discharge pipe and a low-pressure side port that directly communicates with the low-pressure chamber of the compression chamber, the high-pressure side inlet port and the high-pressure side outlet port are simultaneously closed on one side, and the other side is closed. A disk-shaped high pressure valve capable of closing the low pressure side port is provided on the side surface, and the high pressure side inlet port is provided on the side surface of the side plate.

According to the above-described configuration, when the high-temperature and high-pressure gas in the closed container is discharged from the high-pressure side inlet port to the refrigerant circuit during compressor operation, the high-pressure side inlet port is located on the side plate side, so that the high-temperature and high-pressure gas is discharged from the high-pressure side inlet port to the refrigerant circuit. Even if the lubricating oil adhering to the side plate surface flows down due to resuction, the high-temperature, high-pressure gas is discharged to the refrigerant circuit without attracting the lubricating oil.

Example An embodiment of the present invention will be described below without reference to the drawings.

In FIG. 1, reference numeral 23 denotes a high-pressure side inlet port, which is provided on the side surface of the side plate.

The operation of the rotary compressor configured as above will be explained below. In order to avoid duplication of explanation, detailed explanations of operations that are the same as those of the conventional example will be omitted. FIG. 1 shows the state at rest, and FIG. 2 shows the state during operation. During operation of the rotary 1 engine, a mist of lubricating oil 32 contained in the high-temperature, high-pressure gas in the closed container adheres to the side plate surface eb and flows down. but,
Since the high-pressure side inlet port 23 is provided on the side plate 5c, the lubricating oil is attracted by the high-temperature, high-pressure gas flow and flows into the condenser 31. It no longer flows into the refrigerant circuit formed from the evaporator 16.

In this way, in this embodiment, the lubricating oil can be prevented from leaking into the refrigerant circuit, so the original refrigerating ability of the rotary compressor can be secured without deteriorating the heat dissipation ability of the condenser. It is possible to prevent an excessive load from being applied to the rotary compressor itself, and since the high-pressure side inlet port is located on the side of the side plate, it is possible to more effectively prevent lubricating oil from flowing out without increasing the number of parts.

Effects of the Invention As described above, the present invention has an advantage in that the inlet port on the high pressure side is located on the side surface of the side plate even if the lubricating oil contained in the discharged gas adheres to the surface of the side plate. Because of this, the lubricating oil is attracted by the high-temperature, high-pressure gas flow and is difficult to flow into the refrigerant circuit.As a result, various problems caused by lubricating oil flowing into the condenser, which have been problems in the past, are avoided. There are some problems that can be solved and have great practical effects.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a rotary compressor showing an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line nn' in FIG. Figure 3 is a cross-sectional view of a conventional rotary compressor, and Figure 4 is a cross-sectional view of a conventional rotary compressor.
It is a sectional view taken along the line ■-■' in the figure. 1...Rotary compressor, 2...
Airtight container, 3... Electric element, 4... Compression element, 6... Crankshaft, 6, 7...
・Side plate, 6a, 7a...Bearing part, 8
... Cylinder plate, 9 ... Rotor, 10 ... Vane, 11 Mountain... Compression chamber, 1
2...Low pressure presentation, 13...High pressure chamber, 16
... Suction pipe, 17... Suction valve, 19.
...Bias spring, 21.. Instep/discharge valve, 23.
...High pressure side inlet port, 24...Discharge pipe, 26...High pressure side outlet port, 27...
Low pressure side port, 28... High pressure valve, 30...
...Pressure path.

Claims (1)

[Claims] The compressor includes a closed container, a compression element and an electric element housed in the closed container, and the compression element includes a side plate having a bearing portion that pivotally supports a crankshaft, and a cylinder plate that rotatably houses a rotor. , a compression chamber is formed by superimposing the side plate and the cylinder plate, a vane that partitions the compression chamber into a low pressure chamber and a high pressure chamber, and a vane that communicates with the low pressure chamber and the high pressure chamber, and is adjacent to the vane. a high-pressure side inlet port that constantly communicates with the closed container, a high-pressure side outlet port that constantly communicates with the discharge pipe, and a pressure guiding path, a low-pressure side port that directly communicates with the low-pressure chamber of the compression chamber, and a disk-shaped disk that can simultaneously close the high-pressure side inlet port and the high-pressure side outlet port on one side, and close the low-pressure side port on the other end side; A rotary compressor comprising a high pressure side valve, and the high pressure side inlet port is provided on a side surface of the side plate.