JPH02275267A - Accumulator and setting method thereof - Google Patents

Abstract

PURPOSE:To prevent a compressor from sucking a liquid refrigerant at the time of operation by a method wherein a liquid tank is wrapped by a double structure and the tank is arranged at a location lower than the compressor in a gravitational direction and at the suction side of the compressor a pressure switch and a relay operated at a set suction pressure are installed. CONSTITUTION:The outer circumference of a liquid tank 1 is wrapped by a cylindrical tank 2 and a cover 3 and another room which has a double tank structure and keeps a perfect air tightness from the tank 1 is installed. The low pressure refrigerant from a vaporizer is caused to flow through a large space in the tank 2 and gasified by using the heat of the high pressure refrigerant in the tank 1 and then is sent to a compressor through a discharge hole 5 installed at the bottom of the tank 2. Next, by the reason that the location of the tank is lower than the compressor in a gravitational direction, the residual refrigerant liquid in the vaporizer and piping is able to be accommodated in the tank inside. Further, a pressure switch 6 and a relay 7 operating after detecting the pressure in the tank 2 are arranged between the coils of a voltage relay 9 controlling an electromagnetic clutch 8.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an air conditioner for an automobile, and particularly to an accumulator for preventing liquid refrigerant from being sucked into a compressor.

[Conventional technology]

Generally, in the refrigerant circuit of an automobile air conditioner, only the gaseous refrigerant that has been completely evaporated in the evaporator is sucked into the compressor, but when the load is small, the refrigerant does not completely evaporate in the evaporator. The bath medium may be sucked into the compressor in a liquid state and cause liquid compression, which may damage the valves of the compressor (first drawback).

In addition, when the vehicle is parked in the hot sun, the expansion valve located inside the vehicle opens naturally, and the liquid refrigerant remaining in the evaporator flows into the compressor, which has a relatively different temperature and height difference due to the location, resulting in less compression. The oil between the slipper and the swash plate inside the machine is washed away, causing the compressor to stick at startup (second drawback).

Normally, the lubricating oil in the compressor circulates together with the refrigerant that circulates in the refrigeration cycle as a liquid or gas, so if there is insufficient refrigerant in the cycle or if a part of the cycle is clogged, the lubricating oil will The supply of lubricating oil to the machine will also be stopped at the same time. However, since the compressor is driven by the engine, it is forced to rotate regardless of the stoppage of lubricant supply, resulting in negative pressure operation and causing abnormal wear and damage to internal parts of the compressor (third drawback).

〔Example〕

The above-mentioned problems should be solved.The invented device is shown in FIG.

In the figure, the outer circumference of the liquid tank 1 is wrapped with a cylindrical tank 2 and a cover 3. It has a double tank structure with a completely airtight separate room from the liquid tank 1, and has a low pressure inlet from an evaporator (not shown). It is assumed that a low pressure discharge port 5 is provided, and a part of the tank 2 further includes a relay 7 operated by a pressure switch 6 and a voltage relay 9 for controlling an electromagnetic clutch 8 of the compressor.

On the other hand, the liquid tank 1 has a refrigerant population of 10 from the condenser.
．． Exit 11. Block 13 with sight glass 12
is fixed to the cover 3 in an airtight manner.

Further, the block 13 has a high pressure liquid refrigerant passage pipe 14,
On the other hand, the desiccant 1 held in the strainer 15.16
7.

Continuing with the explanation of the operation of this accumulator with the above structure, high-pressure refrigerant, which is a mixture of liquid and gas, enters from the condenser (not shown) from the 1° inlet. It is separated into liquid and gas in the liquid tank 1. Strainer 15.
16. The liquid refrigerant that has passed through the desiccant 17 is sent through the pipe 14 from the discharge port 11 to an expansion valve and an evaporator (both not shown). Normally, the refrigerant that has passed through the evaporator is converted into low-pressure gas and sucked into the compressor, but if the load on the evaporator is small, some low-pressure liquid refrigerant may remain. For this purpose, the refrigerant from the evaporator is passed through a large space inside the tank 2 from the low-pressure inlet 4. By using the heat of the high-pressure refrigerant in the liquid tank 1 to completely gasify it and then sending it to the compressor via the discharge port 5 provided at the bottom of the tank 2, the first drawback of the conventional cycle is compressed. It has the feature of preventing accidents caused by liquid returning to the machine.

Furthermore, the heat of vaporization generated by the refrigerant vaporization action within the tank 2 has the advantage of cooling the high-pressure liquid refrigerant within the liquid tank 1, thereby ensuring a stable liquid level.

Next, in order to prevent the refrigerant liquid from stagnation when the vehicle is parked (compressor 0FF), the accumulator (Fig. 1) should be positioned below the compressor in the direction of gravity, so that the evaporator and inside the piping can be prevented. It becomes possible to store the residual liquid refrigerant in this accumulator, and it is possible to prevent the liquid from stagnation in the compressor.

Furthermore, the third drawback is the compressor seizing and locking accident due to insufficient return of lubricating oil that occurs when there is insufficient refrigerant or when the cycle is partially clogged. By disposing the relay 7 between the coils of the voltage relay 9 that controls the electromagnetic clutch 8, it is possible to prevent negative pressure operation of the compressor.

〔Effect of the invention〕

By integrating the beam kit tank 1 and the accumulator 2 of the present invention, the thermal energy of both can be used mutually and the mounting position can be placed at any desired location, resulting in the following effects.

■ Prevent liquid refrigerant from being sucked into the compressor during compressor operation.

■ When the compressor is OFF, the accumulator should be located at a position lower than the compressor in the direction of gravity to prevent the lubricating oil film inside the compressor from being washed away due to the movement of liquid refrigerant due to the outside temperature and to prevent the liquid refrigerant from sleeping in the compressor. I can do it.

■ A pressure switch 6 and a relay 7 are installed on the suction side of the compressor to operate at a certain suction pressure.
A compressor protection device that opens an electromagnetic clutch for a compressor when the cycle is clogged or the like can be obtained.

[Brief explanation of drawings]

FIG. 1 is a structural diagram of an embodiment of the present invention. 1...liquid tank, 2...tank, 4...low pressure inlet. 5...Discharge port, 6...Pressure switch, 7...Relay, 8...Electromagnetic clutch, 9...Voltage relay, 10
...Inlet, 11...Discharge port, 14...Pipe, 15゜16...Store tower 1 diagram

Claims (3)

[Claims] 1. It has a double structure that encloses the liquid tank, and the low-pressure refrigerant from the evaporator passes through a wide space around the outer circumference of the liquid tank, and is completely gasified by the heat action from the liquid tank and the accumulator effect before being sent to the compressor. Accumulator featuring. 2. A method for installing an accumulator, characterized in that when the accumulator according to claim 1 is mounted on an actual vehicle, the accumulator is installed below the compressor in the direction of gravity, thereby preventing trapped liquid refrigerant from remaining in the compressor. 3. A pressure switch and relay are installed that operate at a certain pressure in the accumulator on the suction side of the compressor, and the coil of the voltage relay that activates the electromagnetic clutch of the compressor is controlled to stop compressor operation when there is insufficient lubricating oil in the compressor. A compressor safety device characterized by: