JPS61283776A - Cooling apparatus for compressor - Google Patents

Abstract

PURPOSE:To obtain the cooling apparatus for a compressor which has the simple constitution and has high reliability by controlling a cooling means for cooling the compressor by the output of a detecting means for detecting the temperature rise of the compressor. CONSTITUTION:The temperature rise of a compressor 1 is detected by a sensor 15 for detecting the discharge gas temperature of the compressor 1, and the output of the sensor 15 is input into a control circuit 14. Since, when the temperature of the compressor 1 increases, also the discharge gas temperature of the compressor 1 increases, the abnormal temperature of the compressor 1 is detected by the discharge gas temperature sensor 15, and a fan motor 12 is operated. The fan motor 12 is operated by the turning-OFF of a switch 16 by the output of the control circuit 14 which is caused by introducing the output of the sensor 15 into the control circuit 14.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a cooling device for a compressor, and particularly to a cooling device using an air blower.

[Background of the invention]

A conventional compressor cooling system is shown in FIG. FIG. 2 is a diagram showing a schematic configuration of a compressor and a refrigeration cycle, where l is a compressor, 2 is a condenser, 3 is a pressure reducer, and 4 is an evaporator. The compressor 1 is a hermetic compressor, and includes a compression section 5 and an electric motor 6.

Oil 7 for lubricating and cooling the sliding parts is sealed inside the compressor 1.

When such a compressor is operated continuously, it reaches a high temperature of about 80° C. Therefore, in order to increase the efficiency of the compressor, it is necessary to cool the compressor.

As a means for this cooling, for example, as shown in FIG. 3, a heat pipe 8 with fins 9 attached is welded to the compressor 1, and the heat inside the compressor 1 is transferred to the outside by the heat exchange action of the refrigerant in the heat pipe 8. Heat dissipation measures were taken. However, this heat pipe is complicated to manufacture, such as installing the heat pipe and filling the refrigerant, and since the capacity of the heat pipe is constant, there is a problem that it is only possible to control the temperature at a constant level.

An example of something related to this type of refrigeration cycle is Japanese Utility Model Application Publication No. 59-148568.

[Purpose of the invention]

An object of the present invention is to provide a compressor cooling device that has a simple structure and is highly reliable.

SUMMARY OF THE INVENTION To achieve the above object, the present invention is characterized in that a compressor whose capacity can be varied by driving the compressor motor in a speed controllable manner is cooled by an air blower. The present invention having such characteristics was made based on the following facts. That is, for example, in a refrigeration cycle such as a household refrigerator, about 50% of the heat radiated on the high temperature side is from the surface of the compressor, and the rest is radiated from the condenser. Therefore, it was found that improving the heat transfer coefficient by improving ventilation to the compressor is the most efficient way to dissipate heat from the high temperature side.

[Embodiments of the invention]

An embodiment of a compressor cooling device with variable capacity according to the present invention will be described with reference to FIG. In the figure, a blower device 13 consisting of a fan 11 and a fan motor 12 is provided near a compressor 1 whose capacity can be varied. When the refrigerator is operated at low temperatures or with low compressor capacity,
Even if the heat dissipation from the compressor 1 is not particularly increased, the temperature rise is small, and there is no problem with reliability. but,
When the refrigerating capacity is increased under high temperature conditions or by operating the electric motor 6 in the compressor 1 at high speed, it becomes necessary to increase heat dissipation from the compressor 1. The air blower 3 shown in FIG. 1 may be operated when the temperature of the compressor 1 reaches a specified value or higher, and may be stopped at other times. 14 is a control circuit composed of, for example, a microcomputer;
The temperature rise is detected by a sensor (for example, a thermistor) 15 that detects the discharge gas temperature of the compressor 1, and the output of the sensor 15 is sent to the control circuit 14.

When the temperature of the compressor 1 rises, the temperature of the discharge gas of the compressor 1 also rises, so the discharge gas temperature sensor 15 detects an abnormal temperature (for example, 55 degrees or more) of the compressor 1 and turns the fan motor 12 on. drive. 7 When the motor 12 is operated, the output of the sensor 15 is connected to the control circuit 14 in all directions, so that the output of the control circuit 14 closes the switch 16 (ON).
This is done by doing this.

When the discharge gas temperature drops, the operation of the fan motor i2 is stopped by the control circuit 14 opening the switch 16 (OFF).

In addition, in FIG. 1, 17 is the operation switch of the compressor 1,
18 is a power supply, and the same reference numerals as in FIG. 2 indicate the same or equivalent parts.

In the above description, the abnormal temperature of the compressor 1 is detected by sensing the temperature of the discharged gas, but the present invention is not limited to this, and can also be performed by sensing the saturation temperature of the condenser 2. Furthermore, when increasing the rotational speed of the electric motor 6 in order to increase the capacity of the compressor 1, it goes without saying that the air blower of the compressor 1 may be operated using a control signal that varies the capacity. In this case, the discharge gas temperature sensor becomes unnecessary. By using a fan as a cooling device,
Enclosing refrigerant inside the pipe like a conventional heat pipe,
Since heat pipe welding to the compressor is not necessary, a cooling device with an extremely simple structure can be obtained.

〔Effect of the invention〕

According to the present invention, since the compressor is cooled only when the compressor 1 is cooled, it is possible to cool the compressor with extremely high reliability such as low noise and power saving.

[Brief explanation of drawings]

FIG. 1 is a diagram for explaining one embodiment of the cooling device of the present invention, and FIG. 2 is a schematic diagram of a refrigeration cycle for explaining a conventional cooling device. 1... Compressor, 2... Condenser, 3... Pressure reducer, 4
...Evaporator, 5.Mechanical part, 6.Electric motor, 7.
...Refrigerating machine oil, 8...Thermosiphon, 9...Radiator, 10...Refrigerant, 11...Fan, 12...
Fan motor, 14...control device. Agent: Patent Attorney Katsuo Ogawa' Jl: 1 mouth, 2 mouths

Claims (1)

[Claims] 1. It consists of a refrigeration cycle having a compressor whose capacity can be varied, a detection means for detecting a temperature rise of the compressor, and a control device for controlling a cooling means for cooling the compressor based on the output from the detection means. A cooling device for a compressor, characterized in that means is provided in the refrigeration cycle.