JPS59224483A - Freezer - Google Patents

Abstract

PURPOSE:To enable a lubricating oil to be normally set to a given temperature by the cooling effect of a lubricating oil when the lubricating oil is at a high temperature and by the insulating effect of an insulating material when it is at a low temperature, by a method wherein the electromagnetic valve of a heat pipe mounted to the bottom of a compressor is controlled by a thermostat. CONSTITUTION:When a compressor 1 is operated and the temperature of a lubrication oil 2 is increased to higher than a given temperature by the insulating effect of an insulating material 3, with a thermostat device, not shown, operated, an electromagnetic valve 5 is brought into a releasing state, a heating evaporating part 4A of a heat pipe 4 is communicated with a radiation condensing part 4B, and the temperature of the compressor 1 is lowered by the cooling effect of the heat pipe 4. When the temperature of the lubricating oil 2 is lowered to a given temperature, the electromagnetic valve 5 is brought to a closing state with the aid of the thermostat device, the heat pipe 4 is brought to an inoperative state, and the temperature of the compressor 1 and the lubricating oil 2 is raised again by the insulating effect of the lubricating material 3. Repetition of such operation enables the lubricating oil 2 to be normally held at a given temperature, and this permits viscosity to be held at a low value and allows reduction of the input of the compressor.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention d relates to temperature control of a compressor of a refrigeration system.

Conventional refrigeration systems generally have a refrigeration cycle in which the young gas compressed by a compressor is circulated from a condenser through a throttle device, an evaporator, and a suction pipe to an FIT and a compressor. In this refrigeration system, the temperature of the compressor changes due to changes in the ambient temperature at the location where the compressor is installed, and the viscosity of the lubricating oil sealed in the compressor changes. Since the viscosity resistance of each sliding part of the compressor changes due to a change in the viscosity of the lubricating oil, the mechanical input has the characteristics shown in FIG. 1 even if the output of the compressor, that is, the refrigerating capacity is the same. That is, when the compressor temperature is relatively high in the summer, the compressor input is small, and when the compressor temperature is relatively low in the winter, the compressor input is large.

In view of the above points, the present invention provides a refrigeration system that maintains the temperature of a compressor appropriately, and aims to save energy throughout the year.

An embodiment of the present invention will be described below with reference to FIG. 1
1 is a compressor, and inside the compressor 1, an electric compression element (not shown) and lubricating oil 2 are housed.

Reference numeral 3 denotes a heat insulating material that intensively insulates the storage portion of the lubricating oil 2 in the compressor 1, prevents heat radiation from the compressor 1, and increases the temperature of the lubricating oil 2. A heat pipe 4 cools the temperature of the compressor 1. The heating evaporation section 4A of the heat pipe 4 is installed so as to exchange heat with the lubricating oil 2 via the bottom surface 1A of the compressor 1. 4B is a heat dissipation condensing section of the heat pipe 4, which cools and condenses the working fluid in the heat vibe 4 that has been evaporated in the heating evaporation section 4A at the ambient air temperature, and operates as a heat pipe. A solenoid valve 5 controls the operation of the heat pipe 4, and is installed in the heat pipe section as close as possible to the heat insulating material 3. Solenoid valve 5
is controlled by a thermostat device (not shown) that directly or indirectly detects the temperature of the lubricating oil 2 in the compressor 1.

The refrigerant gas compressed by the compressor 1 passes through the condenser 6° throttle device, the evaporator 8, and then circulates back to the compressor 1, forming a refrigeration cycle.

The operation of the solenoid valve 5 will now be explained. When the compressor 1 is operated and the temperature of the lubricating oil 2 becomes higher than a predetermined temperature due to the heat insulating effect of the heat insulating material 3, the electromagnetic valve 5 is kept open by the action of the thermostat device. At this time, the heating evaporation section 4A and the heat radiation condensation section 4B of the heat pipe 4 are communicated with each other, so that the heat pipe 4 is operated to lower the temperature of the compressor 1.

When the temperature of the lubricating oil 2 drops to a predetermined temperature, the electromagnetic valve 6 is closed by the thermostat, the heating evaporation section 4A and the heat radiation condensation section 4B of the heat pipe 4 are shut off by the electromagnetic valve 5, and the hild pipe 4 is closed. It stops working.

Then, the temperature of compressor 1 and lubricating oil 2 is ml heating material 3
It rises again due to the insulation effect of . By repeating this action, the temperature of the lubricating oil 2 is maintained at a predetermined temperature. The relationship between the cooling capacity of the heat pipe 4 and the heat insulating capacity of the heat insulating material 3 is that when the temperature of the compressor 1 is at its highest, such as in summer, when the heat pipe 4 is constantly operating,
The capacity is set so that the temperature is equivalent to that of

According to this configuration, even when the temperature of the compressor 1 is at its highest in summer, etc., the temperature of the lubricating oil 2 can be maintained at the same level as before due to the cooling effect of the heat pipe 4, so problems such as deterioration of the lubricating oil 2 can be avoided. There isn't. In addition, when the temperature of the compressor 1 is relatively low, such as during winter, the temperature of the compressor 1 is increased due to the insulation effect of the heat insulating material 3, and the temperature of the lubricating oil 2 is maintained at a predetermined temperature by the function of the thermostat device, so that the lubrication is maintained. It is possible to maintain the viscosity of the oil 2 at a low viscosity, and the human power required for the compressor can be reduced.

As described above, the refrigeration system of the present invention fixes one side of the heat pipe having a solenoid valve to the bottom of the compressor for heat exchange, and also provides a heat insulating material around the compressor to increase the temperature of the lubricating oil inside the compressor. The solenoid valve can be controlled by a thermostat device that directly or indirectly detects the temperature of the lubricating oil, and the temperature of the lubricating oil can be set to a predetermined temperature. Since the temperature of the lubricating oil can be maintained at the same level or lower, there are no problems such as deterioration of the lubricating oil or reduction in refrigeration capacity. On the other hand, when the temperature of the lubricating oil is low, such as in winter, the operation of the heat pipe is stopped by the action of the thermostat device, and the temperature of the compressor is increased by the insulation effect of the insulation 42, and the lubricating oil is maintained at a predetermined temperature. It is possible to maintain the viscosity of the compressor at a low and appropriate viscosity, which not only reduces compressor operation input and reduces energy consumption, but also reduces noise since the compressor is surrounded by insulation material. This has great practical effects, such as being able to achieve the same goals.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the relationship between compressor temperature and compressor input of a conventional refrigeration system, and FIG. 2 is a refrigerant circuit diagram of a refrigeration system showing an embodiment of the present invention. 1... Compressor, 2... Lubricating oil, 3...
...Insulation material, 4...Heat vibrator, 5...Solenoid valve.

Claims (1)

[Claims] 11-In a device configured by sequentially connecting a condenser, a condenser, a throttle device, and an evaporator, 1. One of the heat pipes having a solenoid valve is fixed to the bottom of the compressor for heat exchange, and a heat insulating material is provided around the compressor, and a thermostat device that directly or indirectly detects the lubricating oil temperature in the compressor is used. To control the solenoid valve! [Refrigerating equipment with 4 characteristics.