JPS62245068A - Cooling device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a cooling device for cooling a plurality of cold storage containers (cold storage chambers) by individually controlling the temperature thereof.

[Conventional technology]

A system in which a single compressor cools multiple cold storage chambers by individually controlling the temperature is known (Japanese Patent Publication No. 46-32029).
, 4B-32030), each cold storage room is equipped with a temperature controller that adjusts the temperature by heating it with a heater when the room is properly cooled.

[Problem that the invention seeks to solve]

In the above system, cooling for at least one cold storage compartment is provided by IT! The compressor will continue to operate as long as the temperature is maintained (the other cold storage compartments are in the appropriate cooling state and the temperature is being adjusted by the temperature controller), but once all the cold storage compartments are in the optimal cooling state, the compressor will continue to operate. Stop. Although this compressor stop condition is thought to occur frequently, such operating conditions are not favorable for the machine. The more the number of cold storage compartments increases, and the more frequently the load changes during temperature control, the more
The compressor is no longer able to comply with this and the refrigeration cycle becomes unstable, leading to poor cooling and compressor failure.

The present invention was made to solve the problems of the conventional technology, and allows the compressor to be operated under favorable conditions, and requires less equipment for load adjustment.
It is an object of the present invention to provide a cooling device that can always provide a stable cooling cycle.

[Means for solving problems]

The present invention is an apparatus for individually cooling a plurality of cold storage chambers with a single compressor, which includes a plurality of temperature raising means each consisting of a thermostat contact and a heater connected in series thereto;
The cooling device has a low pressure switch, a compressor motor, and a high pressure switch connected in series, and the operation of the compressor motor is controlled regardless of the operation of the thermostat.

FIG. 1 is a principle circuit diagram of the present invention, in which the power line 1
Contact points 3 of a plurality of thermostats 5 connected between 2;
A heater 4 that operates when this contact 3 is closed;
A switch 6 that opens when the pressure is low, a compressor electric motor 7,
It consists of a high voltage switch 8 for directly connecting the electric motor 7 to the power line 2 when the voltage is low, and for connecting the electric motor 7 to the power line 2 via the fan motor 9 when the voltage is high.

[For production]

Regardless of the operation of the switch 6 that opens at low pressure, the compressor motor 7, and the high pressure switch 8, the thermostat 5
The heater 4 is controlled to be connected between the power lines 1 and 2 by the operation of the contact 3.

Therefore, even when the cooling load is low, important operations of the electric motor 7 due to frequent operations of the thermostat are avoided, the compressor is smoothly controlled, and long life and quiet operation are possible.

〔Example〕

FIG. 2 shows a preferred embodiment of the cooling device according to the present invention, in which a series circuit consisting of a compressor 10 and a condenser 11 is connected via a flow divider 12 to a capillary tube 13 and a cooler 14. Consists of multiple cooling circuits connected. 1st
The heater 4 shown in the figure may heat the vicinity of the entrance of the capillary tube 13 to promote vaporization of the refrigerant, or may heat the container 15 itself.The operation of the entire apparatus is as follows. That is, when the power is turned on using a switch (not shown) or the like, the motor 7 is connected between the power lines 1 and 2 through the series circuit of the low voltage switch 6, the high voltage switch 8, and the fan motor 9 because the voltage is in a high voltage state. . Here, the installed container 15 is cooled, and when the cooling temperature at which the thermostat 5 operates is reached, the contact 3 of the thermostat 5 is closed and heating by the heater 4 is performed. Accordingly, the vicinity of the entrance of the capillary tube 13 or the container 15 itself is heated and controlled to a predetermined temperature. At this time, the fan motor 9 works and the supercooled state can be easily escaped. Container 15 to be installed
Even if the number of containers is small and the cooling load is small, the temperature of the container 15 is controlled within a predetermined range by controlling the thermostat 5. When the low pressure switch 6 operates, the power to the electric motor 7 is naturally cut off, but since the frequency of operation is very low compared to the frequent operation of the thermostat 5, the compression switch is frequently turned on and off. There isn't.

〔Effect of the invention〕

As described above, according to the present invention, the compressor is turned on.
- Since the OFF operation is not performed frequently, operation is extremely smooth and the life of the equipment can be extended.

[Brief explanation of drawings]

FIG. 1 is a principle circuit diagram of the present invention, FIG. 2 is a circuit diagram of an embodiment of the present invention, and FIG. 3 is a diagram showing a container device suitable for use with the present invention. Explanation of symbols 3--Thermostat contacts, 4--Heaters 1, 5
・-・Thermostat, 6-Low pressure switch, 7-Compressor electric motor, 8--High pressure switch, 9-Fan motor

Claims (2)

[Claims] (1) A device for individually cooling multiple cold storage rooms with a single compressor, which includes multiple temperature raising means consisting of thermostat contacts and heaters connected in series, and low pressure connected in series. 1. A cooling device comprising a switch, a compressor motor, and a high-pressure switch, the operation of the compressor motor being controlled regardless of the operation of the thermostat. (2) A fan motor is provided, and the high pressure switch is a changeover type switch, and when the pressure is high, the operation of the high pressure switch connects the compressor motor to the power supply line via the fan motor, and the 2. The cooling device according to claim 1, wherein the electric motor of the compressor is directly connected to a power supply line during operation.