JPH06147660A - Method for operating freezer device - Google Patents

Abstract

PURPOSE:To start the operation of a freezer easily under any condition. CONSTITUTION:The device is provided with an evaporator 19 installed in a freezer device 1, a condensor 21 for supplying liquified refrigerant to the evaporator 19 through a pressure reducing means 20, a compressor 22 for compressing gasified refrigerant got from the evaporator 19 and feeding it out to the condensor 21, and a bypass pipe 23 for directly bypassing compressed gasified refrigerant before flowing into the condensor 21 to an inlet port side of the evaporator 21. There is also provided a solenoid valve 24 installed in the midway part of the bypass pipe 23 and forming a freezing circuit. A method for so operating the freezer device that the operation of the compressor 22 is started after the solenoid valve 24 is opened for a predetermined period of time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for operating a refrigeration system having a refrigeration cycle provided with a pipe for directly bypassing the vaporized refrigerant compressed before flowing into a condenser to the inlet side of the evaporator.

[0002]

2. Description of the Related Art In a conventional refrigeration system of this type, since the compressor was operated at the start of operation, the high-pressure side pressure and the low-pressure side pressure in the refrigeration cycle were almost in equilibrium when the compressor was stopped for a long time. The compressor can be started easily, but when restarting after the operation is stopped, if the stop time is short, the pressure difference between the high-pressure side pressure and the low-pressure side pressure will be large, and the motor will only send more refrigerant to the high-pressure side. Since it requires an output, it has a drawback that it cannot be started easily.
As a compressor, the rotary type is remarkably defective in this, and as a technique for improving this defect, Jitsuko Sho 31-173.
There is an 85 publication.

[0003]

However, this is a light starter having a check valve on the suction side of the rotary compressor. However, even with this method, the time required to reduce the pressure difference between the high pressure side and the low pressure side is required, so when restarting after a short time, the operation starts with a large pressure difference. As a result, the load of the motor output is abnormal and the engine cannot be started.

Provided is a refrigerating apparatus operating method for easily starting the engine under any condition.

[0005]

As a means for achieving the above-mentioned object, the present invention provides an evaporator provided in a refrigerating apparatus, and a condenser for supplying a liquefied refrigerant to the evaporator via a pressure reducing means. , A compressor that compresses the vaporized refrigerant from the evaporator and sends it to the condenser, and a bypass pipe that directly bypasses the compressed vaporized refrigerant before flowing into the condenser to the inlet side of the evaporator, The present invention provides an electromagnetic valve that is provided in the middle of a bypass pipe and forms a refrigeration circuit, and a method for operating a refrigeration system that starts the operation of the compressor after opening the electromagnetic valve for a predetermined time.

Further, when the compressor overload protection device is activated, the compressor is stopped and the compressor is started again, the operation of the compressor is restarted after opening the solenoid valve for a predetermined time. A method for operating the refrigeration system according to claim 1 is provided.

[0007]

According to the present invention, since the operation of the compressor is started after the solenoid valve provided in the middle of the bypass pipe is opened for a predetermined time, the refrigerant rapidly flows from the high pressure side to the low pressure side, and the pressure difference in a short time. Therefore, the compressor can be smoothly started regardless of the state in which the operation is started.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention used in an ice making machine will be described with reference to the drawings. However, the invention can be applied to any refrigeration system without departing from the spirit of the present invention. First, FIG. 1 shows an inverse cell type ice making machine equipped with the present invention. An ice making device (freezing device) 1 of this ice making machine has a large number of downwardly opening ice making chambers 2 and an evaporator 19 on its upper surface. It has an ice making unit 3 provided, a tilting member 5 including a water tray 4 for opening and closing each ice making chamber 2 from below, and a drive device 6 for driving the tilting member 5 to open and close. The tilting member 5 includes a water tray 4 that opens and closes the ice making chamber 2, a water tank 7 that is mounted so as to cover the lower portion of the water tray 4, and a circulation that sends water from the water tank 7 to a sprinkler of the water tray 4. It has a pump 9 and a water level control unit 11 equipped with a water level switch 10 for adjusting the water level of the water tank 7. The water tray 4 has a sprinkling passage, and has a sprinkling nozzle for the ice making chamber 2 and a condensing hole for returning the residual water in the ice making chamber 2 to the water tank 7. The tilting / removing member 5 is pivotally supported by its rear portion, and the front portion is pulled down by the drive device 6 and is pivoted by pulling up. The drive device 6 reciprocates the drive cam 14. The drive cam 14 has a first arm 15 and a second arm 16 extending in opposite directions, and a water tray 4 and an evaporator 19 in the middle.
A peeling assisting projection is formed to release the close contact with.

The present invention may be applied to other ice making machines such as an auger type ice making machine and a falling type ice making machine, and may be any refrigerating apparatus as long as it meets the requirements of the present invention. . A description will be given of a refrigeration circuit, which is the gist of the present invention, in the ice making device 1 with reference to FIG. 2. An evaporator 19 is provided in the ice making unit 3, and an expansion valve as a pressure reducing means is provided in the evaporator 19. A condenser 21 for supplying a liquefied refrigerant via 20, a compressor 22 for compressing the vaporized refrigerant from the evaporator 19 and sending it to the condenser 21, and a condenser 22 for preventing an overload of the compressor 22. Overload protection device 26
A hot gas bypass pipe 23 for directly bypassing the compressed vaporized refrigerant before flowing into the condenser 21 to the inlet side of the evaporator 19; and a solenoid valve 24 provided in the middle of the bypass pipe 23. It will be. The condenser 21
A liquid receiver 25 is provided between the expansion valve 20 and the expansion valve 20.

With such a configuration, during the ice making operation, as shown by the solid line arrow in FIG. To circulate the refrigerant, and during ice removal operation, as indicated by the dotted arrow,
The refrigerant is circulated in the order of the compressor 22, the solenoid valve 24, the evaporator 19, and the compressor 22. Next, the operation control of the present invention will be described using the flowcharts of FIGS.

First, FIG. 3 shows the control during normal operation. When the operation is started (S1), only the solenoid valve 24 is first opened. (S2) Then, it is determined whether or not a predetermined time has elapsed. (S3) When the predetermined time has not elapsed (NO), the solenoid valve 24 remains open until the predetermined time elapses. When the predetermined time has passed (YES), the solenoid valve 24 is closed. (S4) Then, the compressor 22 is started.
(S5) FIG. 4 shows control during operation of the overload protection device 26. When the overload protection device 26 operates (S6), the compressor 22 is stopped. (S7) After that, when the overload protection device 26 is restored (S8), only the solenoid valve 24 is opened (S9), and it is checked whether a predetermined time has elapsed. (S10) Here, if the predetermined time has not elapsed (NO), the predetermined time elapses, and after the predetermined time has elapsed (YES), the solenoid valve 24 is closed. (S11) After that, the compressor 22 is started to start normal operation.

As described above, the high pressure side and the low pressure side are directly connected, and the refrigerant rapidly flows from the high pressure side to the low pressure side, so that the pressures equilibrate in a short time. It is sufficient that the solenoid valve 24 is opened for about 3 seconds. Then, after the predetermined time has elapsed, the electromagnetic valve 24 is closed and then the compressor 22 is started. At the same time, the water supply electromagnetic valve for supplying the ice making water to the water tank 7, the water tank. In the case of a circulation pump and an air-cooled condenser for sending the ice making water in 7 to the ice making chamber 2, the cooling fan motor is started to start the normal ice making operation.

[0013]

As described above, according to the present invention, the operation of the compressor is started after the electromagnetic valve provided in the middle of the bypass pipe is opened for a predetermined time, so that the high-pressure side pressure and the low-pressure side pressure are substantially balanced. Since the compressor is started from the state, the compressor can be smoothly started even if the operation is started in any state.

[Brief description of drawings]

FIG. 1 is a side view of an inverse cell type ice making machine equipped with the present invention.

FIG. 2 is a circuit diagram of the refrigerating apparatus of the present invention.

FIG. 3 is a flowchart of control during normal operation according to the present invention.

FIG. 4 is a flow chart of control when the overload protection device of the present invention is activated.
It is a chart.

[Explanation of symbols]

 1 Refrigeration Device 3 Ice Making Unit 19 Evaporator 20 Decompression Means 21 Condenser 22 Compressor 23 Bypass Pipe 24 Solenoid Valve 26 Overload Protection Device

Claims (2)

[Claims] 1. An evaporator provided in a refrigerating apparatus, a condenser for supplying a liquefied refrigerant to the evaporator via a pressure reducing means, and a compressor for compressing the vaporized refrigerant from the evaporator and sending it to the condenser. Machine, a bypass pipe for directly bypassing the compressed vaporized refrigerant before flowing into the condenser to the inlet side of the evaporator, an electromagnetic valve provided in the middle of the bypass pipe and forming a refrigeration circuit, A method for operating a refrigerating apparatus, comprising: starting operation of a compressor after opening a solenoid valve for a predetermined time. 2. When the compressor overload protection device is activated, the compressor is stopped and the compressor is started again, the operation of the compressor is restarted after the solenoid valve is opened for a predetermined time. The method of operating the refrigeration system according to claim 1.