JPH0579897B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention has an evaporator, a condenser, a compressor, and a main motor for driving the compressor, and the main motor is cooled with condensed refrigerant liquid. The present invention relates to a method of operating a refrigerant machine as described above.

[Conventional technology]

This main motor cooling system, as disclosed in Japanese Patent Application Laid-Open No. 58-110963, uses the heat recovered when cooling the internal heat of the main motor to be directly released into the cooling water in the condenser. This is a cooling method that does not use compression power and is effective in saving energy for refrigerators. In this type of system, a refrigerant pump is provided to supply a refrigerant for cooling to the main motor.

[Problem that the invention seeks to solve]

However, in such a refrigerator, cavitation occurs in the refrigerant pump during startup or under light load, which may lead to vibration and damage to the refrigerant pump.

Normally, the refrigerant pump used for such applications is a closed type with bearings lubricated by refrigerant liquid in order to improve the airtightness of the refrigerator, but under the cavitation phenomenon described above, the refrigerant If the bearing is not sufficiently lubricated by the liquid and is exposed to such a phenomenon for a long period of time, there is a problem that the durability of the refrigerant pump is adversely affected.

In order to solve this kind of problem, it is possible to stop the refrigerant pump in situations where cavitation phenomenon is likely to occur, but stopping the refrigerant pump may cause the main motor to overheat. As a secondary means to eliminate this problem, it may be possible to stop the main motor in conjunction with the refrigerant pump. However, stopping the main motor of a refrigerator, unlike a refrigerant pump, consumes a large amount of power, so if the number of stops and starts increases, voltage fluctuations may occur in the power supply system, or instantaneous This caused problems such as large current flowing.

The present invention solves the problems of the conventional methods as described above, and provides a highly reliable method of operating a refrigerator that prevents cavitation of the refrigerant pump and does not adversely affect the power supply system. The purpose is to

[Means for solving problems]

The inventors conducted experiments to achieve the above objectives.
The present invention was made based on the findings obtained through repeated research.

In other words, the inventors' research has shown that during operation of the refrigerator, especially when it is operated under an extremely light load, or for a certain period of time when the refrigerator is started, a sufficient amount of refrigerant cannot be obtained to condense in the condenser. It was confirmed that, as a result, the amount of refrigerant required for suction into the pump was insufficient, causing cavitation.

On the other hand, even if the refrigerant pump is stopped while the main motor is running, or if the main motor is operated without the refrigerant pump running, the internal temperature of the main motor will not rise rapidly and usually lasts for 10 to 15 minutes. It was confirmed that the system can be operated without any practical problems. It has also been confirmed that if only the main motor continues to be operated for a longer period of time, the internal temperature of the motor will rise and the thermostat installed in the main motor will operate, causing the refrigerator to stop abnormally. In this way, it was confirmed that the operating time of the main motor can be increased by 10 to 15 minutes compared to the required operating time of the refrigerant pump.

In normal refrigerator applications, even if the refrigerant pump is stopped due to an extremely low load on the refrigerator and the refrigerant pump is likely to cause cavitation, the refrigerant load will decrease within 10 to 15 minutes. In many cases, the refrigerant pump becomes able to restart operation without cavitation because the refrigerant liquid increases and the refrigerant liquid becomes sufficient again. There is no need to stop it in conjunction with the refrigerant pump,
Keep the main motor running as long as practical,
It has been confirmed that it is possible to create a desirable operating mode for the problems that occur in the power supply system as described above.

On the other hand, at startup, the amount of refrigerant required for suction by the refrigerant pump is not sufficiently obtained, and cavitation is therefore likely to occur.However, as mentioned above, the main motor is started without the refrigerant pump being operated. However, for some time there are no cooling problems. Once started, if the refrigeration load is sufficient, a large amount of refrigerant will condense in the condenser and refrigerant liquid will be obtained, and the refrigerant pump will be able to operate without cavitation. Therefore, the refrigerant pump and main motor do not necessarily need to be operated in conjunction with each other even at startup; in practice, the main motor is operated first while the refrigerant pump is stopped, and the refrigerant pump is turned off when the refrigerant level is secured. It was confirmed that it is possible to operate the refrigerant pump in a desirable operating mode to extend the life of the refrigerant pump.

Based on these findings, the present invention aims to prolong the life of the refrigerant pump, maintain smooth cooling of the main motor, and obtain an operating method that has less negative impact on the main motor's power supply system. When the surface level drops, the refrigerant pump is stopped, and the main motor is operated as long as the internal cooling effect can be obtained.
The main motor is stopped when the cooling effect is no longer obtained, or the refrigerant pump is operated again when the suction liquid level of the refrigerant pump is sufficiently obtained, or the refrigeration load is reduced when the main motor is stopped. The structure is such that the main motor is operated again when the amount increases.

The present invention includes an evaporator, a condenser, a compressor, and a main motor that drives the compressor, and communicates an internal space of the main motor with the condenser to transfer the refrigerant liquid condensed in the condenser to the main motor. In a method of operating a refrigerator in which a refrigerant is introduced into the internal space of a motor via a refrigerant pump, with regard to the operation and stopping of the main motor and the refrigerant pump, when starting the refrigerator, the main motor is operated while the refrigerant pump is stopped. and a step of detecting a drop in the suction liquid level of the refrigerant pump and stopping the refrigerant pump when the refrigerator is in operation and the main motor and refrigerant pump are in operation;
The process of detecting a decrease in the cooling effect of the main motor and stopping the main motor when the main motor is in operation and the refrigerant pump is stopped while the refrigerator is operating, and the process of stopping the main motor, and the operation of the refrigerator A refrigerator characterized in that the refrigerator is operated by detecting an increase in the load of the refrigerator and operating the main motor when the main motor and refrigerant pump are stopped. It's a driving method.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings.

In FIG. 1, 7 is a compressor, and the speed increaser 1
It is driven by the main motor 11 via 0. Reference numeral 9 denotes a suction vane as a capacity control device, and the opening degree of the vane is controlled by an actuator 17 to control the capacity of the compressor 7, that is, the capacity of the refrigerator.

The condenser 3 and the evaporator 1 are formed within one can body. The condenser 3 has an inlet side connected to the discharge side of the compressor 7, and an outlet side equipped with a float chamber 12 in which condensate is stored, and communicates with the bottom of the evaporator 1 via a float valve 16. . The evaporator 1 is connected via a passage 5 to the suction side of the compressor 7 .

4 is a cooling water passage, and 2 is a cold water passage.

The refrigerant liquid storage section of the float chamber 12 includes a passage 14,
Refrigerant pump 20, passage 14', spray nozzle 1
It is connected to the internal space of the main motor 11 via 5. 21 is a passage that communicates the internal space of the main motor 11 and the condenser 3.

On the discharge side of the refrigerant pump 20, a solenoid valve 22 and an orifice 26 are provided in parallel in a passage 14'. 45 is a temperature detector that detects the cold water outlet temperature.

Reference numeral 18 has an operation panel as a control mechanism, which receives a chilled water outlet temperature signal as a load signal, a suction vane opening signal, etc., and operates the refrigerant pump 2 as described later.
0, a solenoid valve 22, an actuator 17, etc.

Further, the operation panel 18 receives a signal of the chilled water outlet temperature or the coolant outlet temperature as a load signal, and outputs a signal to the actuator 17 to operate the suction vane 9 so as to set the chilled water outlet temperature to a predetermined temperature. capacity control.

The refrigeration cycle will be explained with reference to FIG. The refrigerant evaporated in the evaporator 1 passes through the passage 5 to the compressor 7.
The air is sucked in, compressed, flows into the condenser 3, condenses, flows into the float chamber 12, is depressurized by the float valve 16, and flows into the evaporator 1 again to form a refrigeration cycle.

Next, the cooling cycle of the main motor 11 will be explained. The internal space of the main motor 11 communicates with the condenser 3 through a passage 21, and the refrigerant for cooling the main motor 11 is sucked from the float chamber 12 of the condenser 3 through the passage 14 by a refrigerant pump 20 and is pressurized. It is supplied to the spray nozzle 15 through the passage 14' and sprayed inside the motor. The sprayed refrigerant takes away the internal heat generation of the main motor 11 and cools the inside of the main motor 11 while evaporating itself, flows into the condenser 3 through the passage 21, and is cooled by the cooling water in the cooling water passage 4. The refrigerant is condensed and returned to the float chamber 12 as a refrigerant liquid. The interior of the main motor 11 is cooled by repeating the above cooling cycle.

Next, the control of this embodiment will be explained.

In FIG. 1, the actuator 17 is provided with a detection mechanism for detecting the operation amount, that is, the opening degree of the operation part of the capacity control mechanism, that is, the suction vane 9, and a detection signal is sent to the operation panel 18, and the refrigerant pump is The main motor 20 and the main motor 11 are configured to control their operating modes.

Figure 2 is an electrical wiring diagram showing a sequence circuit.
23 is a contact that is connected when the opening degree of the suction vane 9 reaches a certain value, that is, the operation amount corresponding to a predetermined minimum capacity, or more; 25 is an electromagnetic switch for a refrigerant pump; 30 is a cold water or cooling water A temperature controller that detects the temperature with temperature detectors 45 and 46 and issues a signal to open and close the suction vane 9; 31 is a module troll motor built into the actuator 17; 32 is the main motor 11 or an oil pump (not shown); A main relay 33 operates in conjunction with the main relay 33, which is activated by the direction in which the suction vane 7 is opened, which is emitted from the temperature controller 30.
4 is a time-limited relay, 35 is a contact that is opened and closed by the relay 33, and 36 is a contact that is opened and closed by the time-limited relay 34.

FIG. 3 is a detailed diagram of the opening detection mechanism of the suction vane 9, where 24 is the minimum opening at which the opening (i.e., the amount of operation) of the suction vane 9 (i.e., the operation part of the capacity control device) with the cam 27 is constant. An opening that exceeds a degree (i.e.,
This micro switch has a built-in contact 23 that is connected when the amount of operation corresponding to a predetermined minimum capacity of the control capacity is reached. FIG. 4 is an explanatory diagram of the operation of three relays related to this embodiment, and the operation mode is divided into three parts a, b, and c in the figure.

The operation will be explained using FIGS. 1 to 4.

During operation of the refrigerator, particularly when the refrigerator is operated under an extremely light load, the suction vane 9 operates with capacity control to keep the chilled water temperature constant, and the module troll motor 31 is operated to almost completely close the control capacity. The amount of operation corresponds to a capacity below the predetermined minimum capacity of , and the action of the cam 24 in FIG.
is cut off and the refrigerant pump 20 stops, but the main relay 32 is excited for a while by the action of the time-limited relay 34, during which the main motor 11 continues to operate, and after a certain period of time T has passed, the contact 36 is cut and the main motor 11
will also stop. The operation during this period corresponds to the operating mode shown in FIG. 4a.

However, the electromagnetic switch 25 was disconnected and the refrigerant pump 2
If a signal to open the suction vane 9 is issued from the temperature controller 30 before a certain period of time T has elapsed after 0 has stopped, the relay 33 is energized, the contacts 35 are connected, and the main relay 32 remains energized. As a result, the main motor 11 no longer stops, the suction vane 9 opens, and the amount of operation corresponds to a capacity greater than the predetermined minimum capacity of the control capacity, and the contacts 23 are connected by the action of the cam 24, and the electromagnetic The switch 25 is excited and the refrigerant pump 20
is operated again. The operation during this period corresponds to the operating mode shown in FIG. 4b.

In this way, if the refrigerant is operated under an extremely light load such that the suction vane 9 is fully closed and the amount of refrigerant required for suction by the refrigerant pump 20 cannot be obtained, the suction liquid The decrease in temperature is indirectly detected by the opening degree of the suction vane 9, and the refrigerant pump 20 is immediately stopped, while the main motor 11 continues to operate without stopping for a certain period of time T during which the cooling effect remains. If there is no load recovery after that and the load remains very small from zero, the main motor 11 can be stopped.

In this way, it is possible to avoid the cavitation phenomenon of the refrigerant pump 20 and to perform an operation that avoids as much as possible the starting and stopping of the main motor 11 that would have an adverse effect on the power supply system.

On the other hand, when starting a refrigerator that has stopped, or during light load operation as described above, the refrigerant pump 20
If the main motor 11 is restarted from a stopped state because the load does not recover after stopping, the suction vane 9
Since it is in the fully closed state, the contact point 23 is disconnected by the action of the cam 24 as described above, and therefore the electromagnetic switch 25 is in a de-energized state and the refrigerant pump 20 is in a stopped state. In this state, if the load on the refrigerator is restored and the chilled water temperature rises, or if the refrigerator is operated as a heat pump and the cooling water temperature decreases, the temperature controller 30 issues a signal to open the suction vane 9, As a result, the relay 33 is energized, the contacts 35 are connected, the main relay 32 is energized, and the main motor 11 starts operating.

Since the main motor 11 is normally operated via a starter, it usually takes several seconds t for the compressor 7 to start operating after the main relay 32 is energized, and during this time the temperature controller 30 sends the actuator of the suction vane 9 Usually, a means is used to prevent the suction vane 9 from opening by blocking the signal to open the suction vane 9 that is transmitted to the suction vane 9.
After the start is completed and the suction vane 9
When the cam 24 opens, a rise in the suction liquid level is indirectly detected based on the degree of opening, and the contact 2 is opened by the action of the cam 24.
3 is connected, the electromagnetic switch 25 is excited, and the refrigerant pump 20 starts operating. The operation during this period is shown in the operating mode shown in FIG. 4c.

In this way, when the refrigerating machine is restarted when it is stopped due to the operation mode shown in FIG. 4a during light load, the refrigerant pump 20 is The refrigerant pump 20 can be operated after stopping the operation of the refrigerant pump 20, waiting for the suction vane 9 to open and the refrigerant necessary for suction to be generated, and for the suction liquid level to rise. It is possible to drive without cavitation.

After starting the refrigerator in this way, when the load becomes stable, the signal to open the suction vane 9 is no longer issued, and in that case, the relay 33 in the operating mode shown in c in Fig. 4 is indicated by a broken line. This is the driving mode.

In this way, in this embodiment, when the main motor 11 is operating and the refrigerant pump 20 is operating, it is detected that the suction liquid level of the refrigerant pump 20 is decreasing, the refrigerant pump 20 is stopped, and the main motor 11 is in operation. When the motor 11 is operating and the refrigerant pump 20 is stopped, the main motor 11 is stopped if the cooling effect of the main motor 11 decreases, and the main motor 11 is stopped if the suction liquid level of the refrigerant pump 20 is rising. The refrigerant pump 20 is operated by detecting the state, and when the main motor 11 is stopped, an increase in the load on the refrigerator is detected and the main motor 11 is started.

Further, in this embodiment, in order to avoid operation of the refrigerant pump 20 under the cavitation phenomenon, the refrigerant pump 20 is configured to be stopped when the suction liquid level of the refrigerant pump 20 decreases.
In order to shorten the zero stop period as much as possible, when the flow rate of refrigerant flowing into the float chamber 12 decreases, a method is used in which the flow rate of the refrigerant pump 20 is reduced to prevent a drop in the suction liquid level, thereby preventing the cavitation phenomenon from occurring. can also be delayed.

As such a method, as shown in FIG. 1, a solenoid valve 22 and an orifice 26 in parallel with the solenoid valve 22 are provided in the discharge passage 14' of the refrigerant pump 20, and when the refrigerant liquid level drops, the solenoid valve 22 is closed. It is also possible to adjust the discharge amount by closing the valve.

In this case, as a method for detecting a drop in the refrigerant liquid level, a contact point is provided with a cam linked to the suction vane 9 as shown in FIG. This can be realized by, for example, a method of configuring the vane 9 to be placed in a position where it operates in a more open state.

In the example shown in FIG. 1, when the main motor 11 is in operation and the refrigerant pump 20 is in operation, the fact that the suction liquid level of the refrigerant pump 20 is decreasing is indirectly indicated by the suction vane 9 corresponding to the decrease in load. As an alternative direct or indirect method of detecting a drop in the suction liquid level, there is a liquid level detection method that operates below a certain liquid level in the float chamber 22. A method of installing a device and detecting a drop in the suction liquid level of the refrigerant pump 20 by operating the liquid level detector, or measuring the current consumption of the refrigerant pump 20, and detecting the current value when cavitation phenomenon occurs. There is a method of detecting a decrease in the suction liquid level of the refrigerant pump 20 when the current consumption of the refrigerant pump 20 falls below a certain value by utilizing the characteristic of the decrease, or a method of measuring the vibration of the refrigerant pump 20. When a cavitation phenomenon occurs, a method of detecting a drop in the suction liquid level of the refrigerant pump 20 when the vibration of the refrigerant pump 20 exceeds a certain value by utilizing the characteristic that the vibration value increases may be used. No problem.

Similarly, in the example of FIG. 1, when the main motor 11 is in operation and the refrigerant pump 20 is stopped, the time-limited relay 34 detects the state in which the cooling effect of the main motor 11 decreases over time. As an alternative method for directly or indirectly detecting a decrease in the cooling effect of the main motor 11, there is a method in which a temperature detector that operates above a certain temperature is provided inside the main motor 11, and detection is performed by the operation of the temperature detector. May be used.

Similarly, in the example shown in FIG. 1, when the main motor 11 is stopped, an increase in the refrigeration load of the refrigerator is detected by the opening signal of the suction vane 9 from the temperature controller 30. As a direct or indirect method of detecting an increase in refrigeration load, it is possible to install a temperature detector in the chilled water system that activates when the chilled water temperature exceeds a certain value, and detect the temperature by the activation of the temperature detector. Alternatively, the suction vane 9 open signal and the temperature sensor signal may be used together.

As described above, there are various means for carrying out the present invention, and they are highly practical. By selecting and combining these means, a wide variety of means exist. Examples are shown in FIGS. 5 to 8.

5 and 6 show other embodiments of the present invention.
The figure is a cycle explanatory diagram, and FIG. 6 is an electrical wiring diagram showing a sequence circuit. To explain the configuration, as shown in FIG. 5, a liquid level detector 40 is installed in the float chamber 12 and is activated when the liquid level falls below a certain level.The detection signal is transmitted to the operation panel 18, and the liquid level detector 40 is activated when the chilled water temperature exceeds a certain value. A temperature sensor 50 is attached to the cold water passage 2 and the detection signal is transmitted to the operation panel 18. Furthermore, a temperature detector 41 that operates at a temperature above a certain temperature is provided in the main motor 11, and the detection signal is transmitted to the operation panel 18.
In addition, an electric circuit is constructed as shown in FIG.

To explain the operation with reference to FIGS. 5 and 6, when the refrigerant pump 20 and the main motor 11 are operating together, the contact 39 is activated when the liquid level falls below a certain value based on the detection signal of the liquid level detector 40. Although the electromagnetic switch 25 is disconnected and the refrigerant pump 20 is stopped, the main motor 11 continues to operate.

Next, when the refrigerant pump 20 is stopped and the main motor 11 is operating, the temperature sensor 4 in the main motor 11
1 is activated, the contacts 38 are disconnected, but at this time, the contacts 37 and 35 are already disconnected due to the light load and the drop in the liquid level and the small opening of the suction vane 9, so the main relay 32 is de-energized. The main motor 11 then stops.

However, in this case, if the refrigerant level in the float chamber 12 rises and the contact 39 is connected before the main relay 32 is de-energized, the electromagnetic switch 25 is energized and the refrigerant pump 20 is operated. At the same time, the contacts 37 are connected, the main relay 32 continues to be excited, and the main motor 11 continues to operate.

On the other hand, when starting a stopped refrigerator, or when restarting from a state where the main motor 11 is stopped due to no load recovery after the refrigerant pump 20 is stopped during light load operation as described above, the load on the refrigerator is When the chilled water temperature rises after recovery, or when the chiller is operated as a heat pump and the chilled water temperature falls, the contact 51 of the temperature detector 50 is connected, thereby energizing the relay 33. The contacts 35 are connected, the main relay 32 is excited, and the main motor 11 starts operating. After the compressor 7 is operated by the operation of the main motor 11, the refrigerant pump 20 is operated as the refrigerant liquid level in the float chamber 12 rises.

In this manner, even in the embodiments shown in FIGS. 5 and 6, the load operation becomes extremely light during operation of the refrigerator, and a sufficient amount of refrigerant required for suction by the refrigerant pump 20 cannot be obtained. If the refrigerant pump 2
0, while the main motor 11 continues to operate while the cooling effect within the main motor 11 remains, and if the refrigeration load recovers and the suction liquid level of the refrigerant pump 20 rises, the main motor 11 continues to operate. When the refrigerant pump 20 is operated and the internal temperature of the main motor 11 rises without recovery of the refrigeration load, the main motor 11 can be stopped.

On the other hand, when starting a stopped refrigerator, or when restarting the main motor 11 from a stopped state because the load has not recovered after stopping the refrigerant pump 20 during the light load, the refrigerant pump 20 moves to the suction liquid level. Since it is started and stopped by the detection signal of the detector 40, it can be operated without causing cavitation phenomenon.

In this way, the refrigerant pump 20 can be operated in a manner that avoids the cavitation phenomenon, and the main motor 11 can be operated in a manner that avoids the frequent starting and stopping of the main motor 11 that would have an adverse effect on the power supply system.

FIG. 7 shows another embodiment of the invention.

In the embodiment shown in FIG. 7, the refrigerant pump 20 is provided with a current detector 42 that is activated when the current consumption of the pump's motor falls below a certain value as a mechanism for indirectly detecting a drop in the suction liquid level of the refrigerant pump 20. , an electric circuit is configured to transmit a detection signal to the operation panel 18 and stop the refrigerant pump 20 when the detector 42 is activated.

With this configuration, the refrigerant pump 2
If the suction liquid level drops to 0, cavitation phenomenon occurs, and the current consumption decreases, the refrigerant pump 2
0 can be stopped and long-term operation under cavitation phenomenon can be avoided. In addition, regarding the operation mode of the refrigerant pump 20 and the main motor 11,
Any of the methods shown in the embodiments of FIGS. 4, 5, and 6 may be adopted.

FIG. 8 shows another embodiment of the present invention.

In the embodiment shown in FIG. 8, as a mechanism for indirectly detecting a drop in the suction liquid level of the refrigerant pump 20, a vibration detector is activated when the amplitude of vibrations generated in the refrigerant pump 20 during operation exceeds a certain value. 43,
An electric circuit is configured to transmit the detection signal to the operation panel 18 and stop the refrigerant pump 20 when the vibration detector 43 is activated.

With this configuration, the refrigerant pump 2
If the suction liquid level drops to 0 and cavitation phenomenon occurs and vibration becomes large, refrigerant pump 2
0 can be stopped and long-term operation under cavitation phenomenon can be avoided.

In addition, regarding the operation mode of the refrigerant pump 20 and the main motor 11, any of the methods shown in the embodiments described above may be adopted.

Although the above embodiment uses a relay sequence, the gist of the present invention is to rationalize the operation mode of the refrigerant pump and the main motor, and therefore, it is possible to use a microcomputer instead of using the illustrated relay sequence. The present invention also includes implementing the same operating mode by attaching a detector or a relay to the microcomputer program and the input/output contacts of the microcomputer.

〔Effect of the invention〕

The present invention stops the refrigerant pump when the suction liquid level of the refrigerant pump decreases, operates the main motor as long as an internal cooling effect can be obtained, and stops the main motor when the cooling effect can no longer be obtained. , or if the suction liquid level of the refrigerant pump is sufficiently obtained, the refrigerant pump is operated again, or if the main motor is stopped, the main motor is restarted when the refrigeration load increases. By configuring the motor to operate, it is possible to avoid operation under the cavitation phenomenon of the refrigerant pump and extend the life of the refrigerant pump, thereby improving the reliability of the motor cooling function. It is possible to provide a highly reliable operating method for a refrigerator that avoids frequent start and stop operations and has little adverse effect on the power supply system of the main motor, and is extremely effective in practice.

[Brief explanation of the drawing]

The drawings relate to embodiments of the present invention; Fig. 1 is a cycle explanatory diagram of one embodiment, Fig. 2 is an electrical wiring diagram showing its sequence circuit, and Fig. 3 is an opening detector of the capacity control mechanism. 4 is a time chart showing the operation of the electric circuit, FIG. 5 is a cycle explanatory diagram of another embodiment, FIG. 6 is an electrical wiring diagram showing the sequence circuit, and FIG. 7 is a time chart showing the operation of the electric circuit. Cycle explanatory diagram of the embodiment, FIG. 8 is a cycle explanatory diagram of another embodiment. 1... Evaporator, 2... Cold water passage, 3... Condenser, 4... Cooling water passage, 5... Passage, 7... Compressor, 9... Suction vane, 10... Speed increaser,
11...Main motor, 12...Float chamber, 14,
14'... passage, 15... spray nozzle, 16
... Float valve, 17 ... Actuator, 18
...Operation panel, 20 ... Refrigerant pump, 21 ... Passage, 22 ... Solenoid valve, 23 ... Contact, 24 ... Cam, 25 ... Solenoid switch, 26 ... Orifice,
27... Micro switch, 30... Temperature controller, 31... Module troll motor, 32...
...Main relay, 33...Relay, 34...Time-limited relay, 35, 36, 37, 38, 39...Contact, 4
0...Liquid level detector, 41...Temperature detector, 42...
...Current detector, 43...Vibration detector, 45, 46
... Temperature detector, 50 ... Temperature detector, 51 ...
contact.

Claims (1)

[Claims] 1. An evaporator, a condenser, a compressor, and a main motor for driving the compressor, an internal space of the main motor communicating with the condenser, and a refrigerant liquid condensed in the condenser. In this method of operating a refrigerator, the refrigerant pump is introduced into the internal space of the main motor via a refrigerant pump, and regarding the operation and stopping of the main motor and the refrigerant pump, the refrigerant pump is stopped when the refrigerator is started. a step of starting the main motor as it is, and a step of detecting a drop in the suction liquid level of the refrigerant pump and stopping the refrigerant pump when the refrigerator is in operation and the main motor and the refrigerant pump are in operation; The process of detecting a decrease in the cooling effect of the main motor and stopping the main motor when the main motor is in operation and the refrigerant pump is stopped while the refrigerator is in operation, and the operation of the refrigerator. A refrigerator characterized in that the refrigerator is operated by detecting an increase in the load of the refrigerator and operating the main motor when the main motor and refrigerant pump are stopped. how to drive. 2. When the refrigerator is in operation and the main motor and refrigerant pump are in operation, the detection of a drop in the suction liquid level of the refrigerant pump is performed by detecting that the suction liquid level has fallen below a predetermined minimum value. Claim No. 1
The method described in section. 3. When the refrigerator is in operation and the main motor and refrigerant pump are in operation, a decrease in the suction liquid level of the refrigerant pump is detected when the current consumption of the refrigerant pump becomes less than a predetermined minimum value. The method according to claim 1, which is carried out by detecting. 4. When the refrigerator is in operation and the main motor and refrigerant pump are in operation, a decrease in the suction liquid level of the refrigerant pump is detected when the vibration value of the refrigerant pump exceeds a predetermined minimum value. The method according to claim 1, which is carried out by detecting. 5. Claim 1, wherein when the refrigerator is in operation, the main motor is in operation, and the refrigerant pump is stopped, an increase in the suction liquid level of the refrigerant pump is detected and the refrigerant pump is operated. Method described. 6. When the refrigerator is in operation, the main motor is in operation, and the refrigerant pump is stopped,
2. The method according to claim 1, wherein the reduction in the cooling effect of the main motor is detected by detecting that the stop time of the refrigerant pump exceeds a predetermined minimum value. 7. When the refrigerator is in operation, the main motor is in operation, and the refrigerant pump is stopped,
2. The method according to claim 1, wherein a decrease in the cooling effect of the main motor is detected by detecting that the temperature within the main motor has exceeded a predetermined maximum value. 8. When the refrigerator is in operation and the main motor and refrigerant pump are stopped, the increase in load of the refrigerator is detected from the chilled water or cooling water temperature control mechanism,
2. The method according to claim 1, wherein the method is carried out by detecting that a signal instructing the capacity control mechanism to operate in a direction in which the capacity increases.