JPH08233379A - Refrigerator - Google Patents

Abstract

PURPOSE: To reduce the impact of the collision of liquid refrigerant fed to the outlet side of a solenoid valve via a bypass tube to an expansion valve and to reduce the collision sound by providing a switching valve and a pressure reducing mechanism interposed in series with the tube for bypassing the valve. CONSTITUTION: When a thermostat 10 senses the temperature of a predetermined temperature or lower in a refrigerating state, a solenoid valve 3 is closed, and a high pressure becomes from a compressor 1 to a condenser 2, a high-pressure liquid tube 28. On the other hand, a low pressure becomes from a high-pressure tube 8a to an expansion valve 4, a low-pressure gas tube 9, an evaporator 5 and the compressor 1. Then, the compressor 1 is stepped. Thereafter, when the thermostat 10 detects the temperature of a predetermined temperature or higher in this state, a solenoid valve 12 for a bypass tube is first opened, high- pressure liquid refrigerant in the tube 8 is pressure-reduced via a capillary tube 13, and then fed to the tube 8a, thereby reducing the impact due to the collision of the liquid refrigerant with the valve 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerating device for cooling the inside of a freezer or the like.

[0002]

2. Description of the Related Art FIG. 3 is a refrigerant system diagram of a conventional refrigeration system. In the figure, 1 is a compressor, 2 is a condenser, 3 is an electromagnetic valve, 4 is an expansion valve, 5 is an evaporator, which are connected in sequence by piping, and the air cooled by the evaporator 5 is stored. A blower 6 for blowing air inside and a blower 7 for blowing air for cooling the high temperature refrigerant flowing through the condenser 2 are provided. In the figure, 8 is a high-pressure liquid pipe connected from the condenser 2 to the solenoid valve 3, 8a is a high-pressure liquid pipe connected from the solenoid valve 3 to the expansion valve 4, and 9 is connected from the expansion valve 4 to the evaporator 5. The low-pressure gas pipe 10 is a thermostat for adjusting the temperature in the freezer in which the evaporator 5 is placed.

When the temperature sensed by the thermostat 10 is equal to or higher than a predetermined temperature, the compressor 1 is in the operating state and the solenoid valve 3 is in the open circuit state due to the switch action of the thermostat 10. The high-temperature and high-pressure gas refrigerant discharged from the compressor 1 is heat-exchanged with the air blown from the blower 7 in the condenser 2 and condensed to become a high-pressure liquid refrigerant. The high-pressure liquid refrigerant is decompressed by passing through the expansion valve 4, and becomes low-pressure liquid refrigerant. The low-pressure liquid refrigerant is heat-exchanged with the air blown from the blower 6 in the evaporator 5, and evaporated to become a low-pressure gas refrigerant. The low-pressure gas refrigerant is sucked into the compressor 1.

When the temperature sensed by the thermostat 10 falls below a predetermined temperature, the solenoid valve 3 is closed due to the switch action of the thermostat 10, and the compressor 1
Between the condenser 2 and the high pressure liquid pipe 8 is in a high pressure state,
After the high pressure liquid pipe 8a, the expansion valve 4, the low pressure gas pipe 9, the evaporator 5 and the compressor 1 are in a low pressure state, the compressor 1 is stopped. (Hereinafter, the electromagnetic valve 3 is closed, the pressure between the compressor 1 to the condenser 2 and the high pressure liquid pipe 8 is high, and the high pressure liquid pipe 8a to the expansion valve 4 to the low pressure gas pipe 9 to the evaporator 5 to the compression The stop of the compressor 1 after the pressure between the machines 1 becomes low is referred to as pump down.) Further, the user of the conventional refrigeration system operates the solenoid valve 3 while the conventional refrigeration system is in operation. The pump is down even when the circuit is closed.

The pump down is also performed when the operation of the conventional refrigeration system is stopped by the switch action of the timer when the operation time exceeds a predetermined time using a timer or the like.

[0006]

The above conventional refrigeration system has the following problems to be solved.

That is, since the conventional refrigerating apparatus is configured as described above, when the temperature sensed by the thermostat 10 becomes higher than a predetermined temperature after the pump down, or the user freezes the conventional refrigerating apparatus. When restarting the device, or when the timer causes the stop time to become a predetermined time or more and the conventional refrigerating device enters an operating state due to the switching action of the timer, the high pressure liquid of the conventional refrigerating device High pressure inside the pipe 8 and high pressure liquid pipe 8a
Since the solenoid valve 3 is opened in a state where the pressure difference from the low pressure inside is large, the high-pressure liquid refrigerant in the high-pressure liquid pipe 8 rapidly flows into the expansion valve 4 through the high-pressure liquid pipe 8a, so that the liquid refrigerant is Collides with the expansion valve 4. (Hereinafter, a phenomenon in which the liquid refrigerant rapidly flows into the expansion valve 4 and collides with the expansion valve 4 is referred to as a liquid hammer phenomenon.) When the liquid hammer phenomenon occurs, an impact sound is generated when the liquid refrigerant collides with the expansion valve 4. There is a problem to be solved, such as the occurrence of the above or destruction of the expansion valve 4.

The present invention has been proposed in order to solve the above problems, and the pressure difference between the high pressure in the high pressure liquid pipe 8 and the low pressure in the high pressure liquid pipe 8a when the solenoid valve 3 is closed. When it is necessary to open the solenoid valve 3 in a large state, the solenoid valve 3 is bypassed and the high pressure liquid refrigerant in the high pressure liquid pipe 8 is depressurized before the solenoid valve 3 is opened. By reducing the pressure by passing through the mechanism and sending it to the high-pressure liquid pipe 8a, and reducing the pressure difference between the pressure in the high-pressure liquid pipe 8 and the pressure in the high-pressure liquid pipe 8a, the solenoid valve 3 is opened. An object of the present invention is to provide a refrigerating device that can reduce the liquid hammer phenomenon.

[0009]

As a means for solving the above problems, the present invention is to provide a refrigerating apparatus as described in (1) to (3) below.

(1). In a refrigerating apparatus in which a compressor, a condenser, a solenoid valve, an expansion valve, and an evaporator are sequentially connected by pipes to form a refrigeration cycle, a bypass pipe that bypasses the solenoid valve and a bypass pipe that is interposed in series. A refrigeration system comprising an opening / closing valve and a pressure reducing mechanism.

(2). In the refrigeration apparatus described in (1) above, the on / off valve of the bypass pipe is opened by a start signal of the compressor,
When the pressure difference between the inlet and the outlet of the solenoid valve becomes equal to or less than a predetermined value, the compressor is started and the solenoid valve is opened at the same time, and the opening / closing valve of the bypass pipe is closed. Refrigeration equipment to be.

(3). In the refrigerating apparatus according to (1) above, an opening / closing valve of the bypass pipe is opened by a start signal of a compressor, and after a predetermined time, the compressor is started and the solenoid valve is opened at the same time to open / close the bypass pipe. A refrigerating apparatus, characterized in that the refrigerating apparatus is configured to be closed.

[0013]

Since the present invention is constructed as described above, it has the following actions.

(1). In the configuration of (1) above, since the bypass pipe that bypasses the solenoid valve is provided, and the on-off valve and the pressure reducing mechanism that are interposed in series in the bypass pipe are provided,
If the on-off valve of the bypass pipe is opened before opening the solenoid valve, one high-pressure liquid refrigerant will flow to the other low-pressure side (the side with the expansion valve) via the pressure reducing mechanism, and the pressure difference between the two will be eliminated. The high-pressure liquid refrigerant does not flow into the expansion valve on the low-pressure side at a high pressure difference and collide with each other as in the conventional case, so that a large impact noise is generated or the expansion valve is not destroyed.

(2). In the configuration of the above (2), when the opening / closing valve of the bypass pipe is opened by the start signal of the compressor of the above (1) and the pressure difference between the inlet and the outlet of the solenoid valve becomes a predetermined value or less, the compressor The solenoid valve is opened at the same time when the engine is started, and then the on-off valve of the bypass pipe is closed. Therefore, the action of the above (1) can be properly performed.

(3). In the configuration of (3) above, the opening / closing valve of the bypass pipe is opened by the start signal of the compressor of the above configuration (1), and after a lapse of a predetermined time, the compressor is started and simultaneously the solenoid valve is opened. Since the on-off valve is closed, the pressure difference is sufficiently eliminated through the bypass pipe within a predetermined time, and then the solenoid valve is opened and the on-off valve that has finished its function is closed. The action is performed properly.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIG. 1 and a second embodiment will be described with reference to FIG. The configuration of the second embodiment (FIG. 2) is different from the configuration of the first embodiment (FIG. 1) only in that the solenoid valve 12 and the capillary tube 13 are switched in series order. It is exactly the same as the effect,
The description of the first embodiment is applied as it is, and the description of the second embodiment is omitted.

FIG. 1 is a refrigerant system diagram of the first embodiment. The same components as those in FIG. 3 of the conventional example are designated by the same reference numerals, and the description thereof will be omitted except when necessary.

In the figure, 11 is a bypass pipe provided to bypass the solenoid valve 3, 12 is a bypass pipe solenoid valve that opens and closes a passage of the bypass pipe 11 provided in the middle of the bypass pipe 11, and 13 is a bypass pipe. It is a capillary tube that forms a pressure reducing mechanism that reduces the pressure of the liquid refrigerant flowing when the piping solenoid valve 12 is in the open state. Other configurations are similar to those of the conventional example.

Next, the operation of the above configuration will be described.

In FIG. 1, when the temperature sensed by the thermostat 10 is higher than a predetermined temperature, the compressor 1 is operating, the blowers 6 and 7 are operating, the solenoid valve 3 is open, and the bypass piping solenoid valve 12 is closed. When it is in the state, the freezing operation is performed. When the thermostat 10 detects a temperature lower than a predetermined temperature in the freezing operation state, the solenoid valve 3 is closed due to the switch action of the thermostat 10, and a high pressure occurs between the compressor 1, the condenser 2 and the high pressure liquid pipe 8. Then, the high pressure liquid pipe 8a, the expansion valve 4, the low pressure gas pipe 9, the evaporator 5 and the compressor 1 are in a low pressure state and then the compressor 1 is stopped (hereinafter, the solenoid valve 3 is closed). After the high pressure state between the compressor 1 and the condenser 2 and the high pressure liquid pipe 8 and the low pressure state between the high pressure liquid pipe 8a, the expansion valve 4, the low pressure gas pipe 9, the evaporator 5 and the compressor 1. Stopping the compressor 1 is referred to as pump down.) In the above state, when the thermostat 10 detects a temperature equal to or higher than a predetermined temperature, the bypass piping solenoid valve 12 is opened to bypass the solenoid valve 3 to bypass the high pressure liquid refrigerant in the high pressure liquid pipe 8. The pressure is reduced through 13 and fed into the high pressure liquid pipe 8a. Since the sent liquid refrigerant is decompressed, the pressure difference between the pressure of the liquid refrigerant and the pressure in the high-pressure liquid pipe 8a is small, and the force of the sent liquid refrigerant to flow into the expansion valve 4 through the high-pressure liquid pipe 8a is small. The impact caused by the collision between the liquid refrigerant and the expansion valve 4 is reduced, and the collision noise generated at that time is also reduced. In this way, the liquid refrigerant flows into the high-pressure liquid pipe 8a, and after the pressure difference between the high pressure inside the high-pressure liquid pipe 8 and the low pressure inside the high-pressure liquid pipe 8a becomes small, the bypass pipe solenoid valve 12 is closed and the solenoid valve is closed. 3 is opened. At this time, since the pressure difference between the high pressure inside the high-pressure liquid pipe 8 and the low pressure inside the high-pressure liquid pipe 8a has already become small, the liquid refrigerant sent from the high-pressure liquid pipe 8 to the high-pressure liquid pipe 8a flows through the high-pressure liquid pipe 8a. The momentum flowing through the expansion valve 4 through the expansion valve 4 is small, the impact due to the collision between the liquid refrigerant and the expansion valve 4 is small, and the collision noise generated at that time is also small. After performing the above operation, the refrigeration system is in operation.

When the user activates the refrigerating apparatus stopped in the pump down state, the bypass piping solenoid valve 12 is opened and the solenoid valve 3 is bypassed.
The high pressure liquid refrigerant in the high pressure liquid pipe 8 is transferred to the capillary tube 13
It is decompressed through and sent to the high pressure liquid pipe 8a. Since the sent liquid refrigerant is decompressed, the pressure difference between the pressure of the liquid refrigerant and the pressure in the high-pressure liquid pipe 8a is small, and the force of the sent liquid refrigerant to flow into the expansion valve 4 through the high-pressure liquid pipe 8a is small. The impact caused by the collision between the liquid refrigerant and the expansion valve 4 is reduced, and the collision noise generated at that time is also reduced. In this way, the liquid refrigerant flows into the high-pressure liquid pipe 8a, and after the pressure difference between the high pressure inside the high-pressure liquid pipe 8 and the low pressure inside the high-pressure liquid pipe 8a becomes small, the bypass pipe solenoid valve 12 is closed and the solenoid valve is closed. 3 is opened. At this time, since the pressure difference between the high pressure inside the high-pressure liquid pipe 8 and the low pressure inside the high-pressure liquid pipe 8a has already become small, the liquid refrigerant sent from the high-pressure liquid pipe 8 to the high-pressure liquid pipe 8a flows through the high-pressure liquid pipe 8a. The momentum flowing through the expansion valve 4 through the expansion valve 4 is small, the impact due to the collision between the liquid refrigerant and the expansion valve 4 is small, and the collision noise generated at that time is also small. After performing the above operation, the refrigeration system is in operation.

When the thermostat 10 detects a temperature higher than a predetermined temperature after the user shuts down the solenoid valve 3 for the purpose of removing frost or ice on the evaporator 5 and pumps down. The solenoid valve 12 for bypass piping is opened to bypass the solenoid valve 3, and the high-pressure liquid refrigerant in the high-pressure liquid pipe 8 is decompressed through the capillary tube 13 and sent to the high-pressure liquid pipe 8a. Since the sent liquid refrigerant is decompressed, the pressure difference between the pressure of the liquid refrigerant and the pressure in the high-pressure liquid pipe 8a is small, and the force of the sent liquid refrigerant to flow into the expansion valve 4 through the high-pressure liquid pipe 8a is small. The impact caused by the collision between the liquid refrigerant and the expansion valve 4 is reduced, and the collision noise generated at that time is also reduced. In this way, the liquid refrigerant is the high pressure liquid pipe 8a.
When the pressure difference between the high pressure inside the high pressure liquid pipe 8 and the low pressure inside the high pressure liquid pipe 8a becomes small, the bypass pipe solenoid valve 12 is closed and the solenoid valve 3 is opened. At this time, since the pressure difference between the high pressure inside the high pressure liquid pipe 8 and the low pressure inside the high pressure liquid pipe 8a has already become small, the high pressure liquid pipe 8
The liquid refrigerant sent from the high pressure liquid pipe 8a to the high pressure liquid pipe 8a
The momentum flowing through the expansion valve 4 through the expansion valve 4 is small, the impact due to the collision between the liquid refrigerant and the expansion valve 4 is small, and the collision noise generated at that time is also small. After performing the above operation, the refrigeration system is in an operating state.

Further, after the operation time exceeds a predetermined time by using a timer or the like and the pump down is performed,
When the thermostat 10 detects a temperature higher than a predetermined temperature, the bypass piping solenoid valve 12 is opened, the solenoid valve 3 is bypassed, and the high pressure liquid refrigerant in the high pressure liquid pipe 8 is depressurized through the capillary tube 13. And sends it to the high pressure liquid pipe 8a. Since the sent liquid refrigerant is decompressed, the pressure difference between the pressure of the liquid refrigerant and the pressure in the high-pressure liquid pipe 8a is small, and the force of the sent liquid refrigerant to flow into the expansion valve 4 through the high-pressure liquid pipe 8a is small. The impact caused by the collision between the liquid refrigerant and the expansion valve 4 is reduced, and the collision noise generated at that time is also reduced. In this way, the liquid refrigerant flows into the high-pressure liquid pipe 8a, and after the pressure difference between the high pressure inside the high-pressure liquid pipe 8 and the low pressure inside the high-pressure liquid pipe 8a becomes small, the bypass pipe solenoid valve 12 is closed and the solenoid valve is closed. 3 is opened. At this time, the high pressure liquid pipe 8
Since the pressure difference between the high pressure inside and the low pressure inside the high pressure liquid pipe 8a has already become small, the high pressure liquid pipe 8 to the high pressure liquid pipe 8a
The liquid refrigerant sent to the expansion valve 4 passes through the high pressure liquid pipe 8a.
The momentum of flowing into is small, the impact due to the collision between the liquid refrigerant and the expansion valve 4 is small, and the collision noise generated at that time is also small. After performing the above operation, the refrigeration system is in an operating state.

The above is the solenoid valve 1 of the bypass pipe 11.
Although the method of starting the compressor 1 when the pressure difference between the inlet and the outlet of the solenoid valve 3 after opening the valve 2 becomes equal to or less than a predetermined value has been described, the compressor 1 is started after a predetermined time has elapsed instead of the pressure difference.
May be started.

As described above, according to the present embodiment, when the solenoid valve 3 is closed and a high pressure difference is generated between the flow passages on both sides of the solenoid valve 3, that is, between the high pressure liquid pipe 8 and the high pressure liquid pipe 8a, the bypass piping is previously set. 11
The electromagnetic valve 12 is opened, and the liquid refrigerant decompressed through the capillary tube 13 is sent from the high-pressure liquid pipe 8 to the same 8a to reduce the pressure difference, and then the electromagnetic valve 3 is opened to allow the liquid refrigerant to flow. Therefore, there is an advantage that a problem that a large impact sound is generated or the expansion valve 4 is broken is solved.

[0027]

The present invention has the following effects because it is configured as described above.

That is, according to the present invention, the bypass pipe for bypassing the solenoid valve is provided, and the opening / closing valve and the pressure reducing mechanism are interposed in series therewith. Therefore, when the pressure difference between the inlet and the outlet of the solenoid valve is large, the solenoid valve is By opening the on-off valve of the bypass piping that bypasses the solenoid valve before opening, and depressurizing the high pressure liquid refrigerant at the inlet side of the solenoid valve and sending it to the outlet side of the solenoid valve,
The impact of the collision between the liquid refrigerant sent to the outlet side of the solenoid valve through the bypass pipe and the expansion valve is reduced, and the impact noise generated at that time is reduced, and the effect of avoiding the destruction of the expansion valve due to the impact is reduced. is there.

Further, after opening the bypass pipe, that is, the on-off valve to reduce the pressure difference between the inlet and the outlet of the solenoid valve, the solenoid valve is opened and the liquid refrigerant at the inlet side of the solenoid valve is sent to the outlet side of the solenoid valve. As a result, the impact of the collision between the fed liquid refrigerant and the expansion valve is reduced, the impact noise generated at that time is reduced, and the expansion valve is prevented from being destroyed by the impact.

[Brief description of drawings]

FIG. 1 is a refrigerant system diagram of a refrigerating apparatus according to a first embodiment of the present invention,

FIG. 2 is a refrigerant system diagram of a refrigeration system according to a second embodiment of the present invention,

FIG. 3 is a refrigerant system diagram showing a conventional refrigeration system.

[Explanation of Codes] 1 Compressor 2 Condenser 3 Solenoid valve 4 Expansion valve 5 Evaporator 6,7 Blower 8,8a High pressure liquid pipe 9 Low pressure gas pipe 10 Thermostat 11 Bypass pipe 12 Solenoid valve (open / close valve) 13 Capillary tube ( Decompression mechanism)

Claims (3)

[Claims] 1. A refrigerating apparatus in which a compressor, a condenser, a solenoid valve, an expansion valve, and an evaporator are sequentially connected by pipes to form a refrigeration cycle, and a bypass pipe bypassing the solenoid valve and a bypass pipe A refrigeration system comprising an on-off valve and a pressure reducing mechanism which are interposed in series. 2. The refrigerating apparatus according to claim 1, wherein the opening / closing valve of the bypass pipe is opened by a start signal of the compressor, and when the pressure difference between the inlet and the outlet of the solenoid valve becomes a predetermined value or less, the compression is performed. A refrigerating apparatus characterized in that the solenoid valve is opened and the on-off valve of the bypass pipe is closed at the same time when the machine is started. 3. The refrigeration apparatus according to claim 1, wherein an opening / closing valve of the bypass pipe is opened by a start signal of a compressor, and after a lapse of a predetermined time, the compressor is started and at the same time the solenoid valve is opened to open the bypass valve. A refrigeration system configured to close an on-off valve of a pipe.