CN113074465B - Refrigeration cycle system, refrigeration equipment and control method thereof - Google Patents

Abstract

The invention provides a refrigeration cycle system, refrigeration equipment and a control method thereof, wherein the refrigeration cycle system comprises a compressor, an evaporator, a first condenser, a second condenser, an evaporation dish and a water temperature sensor arranged in the evaporation dish, the inlet end of the first condenser is connected with the outlet end of the compressor, the outlet end of the first condenser is connected with the inlet end of the evaporator, the second condenser is arranged in the evaporation dish, the inlet end of the second condenser is connected with the outlet end of the compressor, and the outlet end of the second condenser is connected with the inlet end of the evaporator. When the temperature value detected by the water temperature sensor is smaller than or equal to a first preset temperature value, the outlet end of the compressor is communicated with the inlet end of the second condenser, so that the second condenser is water-cooled by using defrosting water with lower temperature, the heat exchange efficiency is improved, and when the temperature value detected by the water temperature sensor is larger than the first preset temperature value, the outlet end of the compressor is communicated with the inlet end of the first condenser, and the cooling is continued by adopting an air cooling or other cooling modes, so that the refrigerating effect is ensured.

Description

Refrigeration cycle system, refrigeration equipment and control method thereof

Technical Field

The present invention relates to the technical field of cold storage and frozen storage, and in particular to a refrigeration cycle system, refrigeration equipment and a control method thereof.

Background Art

The refrigeration system cycle efficiency is a key factor affecting the refrigerator, and reducing the condensing pressure can improve the refrigeration cycle efficiency. In general refrigeration system design, the condensing pressure is reduced by strengthening the heat dissipation of the condenser. The means of strengthening heat dissipation include increasing the length/heat dissipation area of the condenser, changing the type of condenser (for example, changing the wire tube condenser to a microchannel condenser, etc.), and increasing the air flow speed around the condenser (increasing the speed of the cooling fan and increasing the forced convection heat transfer coefficient).

However, for the enhanced heat dissipation method of conventional refrigerators, the heat exchange efficiency of the condenser is limited. How to improve the heat exchange efficiency of the condenser is an important problem that technicians in this field need to solve.

Summary of the invention

An object of the present invention is to provide a refrigeration cycle system, a refrigeration device and a control method thereof that at least solve the above-mentioned technical problems.

A further object of the present invention is to save energy and reduce consumption.

According to one aspect of the present invention, the present invention provides a refrigeration cycle system of a refrigeration device, comprising:

compressor;

Evaporator;

An evaporating dish, used to receive defrost water from the evaporator discharged from a defrost drain pipe of the refrigeration equipment;

A first condenser, whose inlet end is connected to the outlet end of the compressor, and whose outlet end is connected to the inlet end of the evaporator;

A second condenser is arranged in the evaporating dish to utilize the defrosting water in the evaporating dish to dissipate heat, the inlet end of the second condenser is connected to the outlet end of the compressor, and the outlet end of the second condenser is connected to the inlet end of the evaporator;

a water temperature sensor, disposed in the evaporating dish and configured to detect the temperature of defrost water in the area of the evaporating dish where the second condenser is located;

The refrigeration cycle system is configured such that when the temperature value detected by the water temperature sensor is less than or equal to a first preset temperature value, the outlet end of the compressor is connected to the inlet end of the second condenser, and when the temperature value detected by the water temperature sensor is greater than the first preset temperature value, the outlet end of the compressor is connected to the inlet end of the first condenser.

Optionally, the refrigeration cycle system further includes:

An electric valve is arranged on the refrigerant pipeline between the outlet of the compressor and the first condenser and the second condenser;

The electric valve is configured to controllably connect the outlet of the compressor and the inlet of the second condenser when the temperature value detected by the water temperature sensor is less than or equal to the first preset temperature value, and to controllably connect the outlet of the compressor and the inlet of the first condenser when the temperature value detected by the water temperature sensor is greater than the first preset temperature value.

Optionally, the refrigeration cycle system further includes:

A first one-way valve is disposed on the refrigerant pipeline between the outlet of the first condenser and the inlet of the evaporator, and is configured to promote the refrigerant at the outlet of the first condenser to flow toward the inlet of the evaporator when the inlet of the first condenser is connected to the outlet of the compressor;

The second one-way valve is arranged on the refrigerant pipeline between the outlet of the second condenser and the inlet of the evaporator, and is configured to promote the refrigerant at the outlet of the second condenser to flow toward the inlet of the evaporator when the inlet of the second condenser is connected to the outlet of the compressor.

Optionally, the refrigeration cycle system further includes:

a water baffle, located in the evaporating dish, configured to separate the evaporating dish into a water evaporation zone and a water cooling zone, wherein the water cooling zone is used to receive defrost water from the evaporator discharged by the defrost drain pipe;

a cover plate, located above the water cooling zone, configured to cooperate with the water baffle to close the water cooling zone, the second condenser is arranged in the water cooling zone, the water temperature sensor is arranged in the water cooling zone, and is configured to detect the temperature of defrost water in the water cooling zone;

A heating pipe is connected between the outlet of the compressor and the first condenser and the second condenser, and is arranged in the water evaporation area. An overflow port is defined between the cover plate and the water baffle plate so that when the defrost water in the water cooling area overflows into the water evaporation area, the heating pipe accelerates evaporation.

Optionally, the outer surface of the second condenser is coated with an anti-corrosion layer or deposited with electrophoretic paint.

Optionally, the second condenser is a microchannel condenser.

Optionally, the refrigeration cycle system further includes:

The heat dissipation fan is arranged adjacent to the first condenser and is configured to accelerate the airflow around the first condenser to accelerate the heat dissipation of the first condenser.

Optionally, the refrigeration cycle system further includes:

The dew removal pipe, the drying filter and the capillary tube are sequentially connected between the outlet ends of the first condenser and the second condenser and the inlet end of the evaporator.

According to another aspect of the present invention, there is also provided a refrigeration device, comprising:

The refrigeration cycle system according to any of the preceding items;

A box body, defining a storage compartment therein;

a temperature sensor configured to detect the temperature inside the storage room;

The controller is configured to control the connection between the outlet of the compressor and the inlet of the second condenser when the temperature value detected by the water temperature sensor of the refrigeration cycle system is less than or equal to a first preset temperature value, and is also configured to control the connection between the outlet of the compressor and the inlet of the first condenser of the refrigeration cycle system when the temperature value detected by the water temperature sensor is greater than the first preset temperature value and the temperature value detected by the temperature sensor is greater than the second preset temperature value.

According to another aspect of the present invention, there is also provided a method for controlling a refrigeration device, comprising:

Detect the temperature of the defrost water in the area where the second condenser is located in the evaporating dish;

Check the temperature in the storage room;

If the temperature of the defrost water is less than or equal to the first preset temperature, connecting the outlet of the compressor and the inlet of the second condenser;

If the temperature of the defrost water is greater than a first preset temperature, and the temperature in the storage room is greater than a second preset temperature, the outlet of the compressor is connected to the inlet of the first condenser.

The refrigeration cycle system, refrigeration equipment and control method thereof of the present invention first utilizes defrost water with a relatively low temperature to water-cool the second condenser to improve the heat exchange efficiency, and when the defrost water temperature rises and reduces the cooling efficiency of the second condenser, the refrigerant is adjusted to flow to the first condenser, and air cooling or other cooling methods are used to continue cooling, thereby ensuring the refrigeration effect.

Furthermore, the refrigeration cycle system, refrigeration equipment and control method thereof of the present invention seal the second condenser in the water cooling zone of the evaporating dish, and can use defrost water to fully cool the second condenser, and use the refrigerant in the heating tube to evaporate the defrost water overflowing into the water evaporation zone, thereby achieving the effect of energy saving and consumption reduction.

Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

FIG1 is a schematic diagram of a refrigeration cycle system according to an embodiment of the present invention;

2 is a schematic diagram of a second condenser of a refrigeration cycle system according to an embodiment of the present invention;

3 is a schematic diagram of a second condenser of a refrigeration cycle system according to another embodiment of the present invention;

FIG4 is a schematic diagram of a refrigeration device according to an embodiment of the present invention; and

FIG. 5 is a schematic diagram of a control method for a refrigeration device according to an embodiment of the present invention.

DETAILED DESCRIPTION

This embodiment first provides a refrigeration cycle system of a refrigeration device 100, which is described in detail below with reference to Figures 1 to 3. The refrigeration device 100 may be a device with refrigeration or freezing storage functions such as a refrigerator or freezer.

1 is a schematic diagram of a refrigeration cycle system according to an embodiment of the present invention, FIG. 2 is a schematic diagram of a second condenser 104 of a refrigeration cycle system according to an embodiment of the present invention, and FIG. 3 is a schematic diagram of a second condenser 104 of a refrigeration cycle system according to another embodiment of the present invention.

The refrigeration cycle system generally includes a compressor 101, a condenser and an evaporator 102, which are connected in sequence through a refrigerant pipeline. The compressor 101 increases the pressure and temperature of the refrigerant vapor through compression, and compresses the low-temperature and low-pressure refrigerant vapor to a high-temperature and high-pressure state; the condenser is a heat exchange device, which uses air to take away the heat of the high-temperature and high-pressure refrigeration vapor from the compressor 101, so that the high-temperature and high-pressure refrigerant vapor is cooled and condensed into a high-pressure refrigerant liquid; and the evaporator 102 is located downstream of the condenser, and the refrigerant liquid flowing into the evaporator 102 evaporates and cools in the evaporator 102 to realize the refrigeration process of the refrigerator, and the generated low-pressure vapor is sucked into the compressor 101 again, and this cycle repeats itself continuously.

For the air-cooled refrigeration device 100, the evaporator 102 is prone to frost during the heat exchange process, and it usually needs to be defrosted after running for a period of time. After defrosting, the defrosted water dripping from the evaporator 102 is generally introduced into the evaporating dish 110 through the defrosting drain pipe 105. That is to say, the evaporating dish 110 is generally used to receive the defrosted water from the evaporator 102 discharged from the defrosting drain pipe 105 of the refrigeration device 100. In traditional refrigeration equipment, the evaporating dish 110 is generally located near the condenser, and the defrosted water in the evaporating dish 110 is evaporated by the heat dissipation of the condenser, and the condenser is generally cooled by air.

In this embodiment, the condenser includes two types, one is the first condenser 103, and the other is the second condenser 104. The inlet of the first condenser 103 is connected to the outlet of the compressor 101, and the outlet is connected to the inlet of the evaporator 102. The inlet of the second condenser 104 is also connected to the outlet of the compressor 101, and the outlet is connected to the inlet of the evaporator 102. That is to say, the first condenser 103 and the second condenser 104 are connected in parallel. In addition, the second condenser 104 is arranged in the evaporating dish 110, and the defrosting water in the evaporating dish 110 can be used to dissipate heat for the second condenser 104, and the second condenser 104 is cooled by water cooling. Since the forced convection heat transfer coefficient of the air cooling method is about 20 to 40 W/m ² *K, and the natural convection heat transfer coefficient of water is as high as 200 W/m ² *K, which is 5 to 10 times the heat transfer coefficient of the condenser of the air cooling method, the heat transfer efficiency of the second condenser 104 using water cooling is higher.

In addition, a water temperature sensor 106 is provided in the evaporating dish 110, which is configured to detect the temperature of the defrosting water in the area where the second condenser 104 is located in the evaporating dish 110. The refrigeration cycle system can be configured such that when the temperature value detected by the water temperature sensor 106 is less than or equal to the first preset temperature value, the outlet of the compressor 101 is connected to the inlet of the second condenser 104, and when the temperature value detected by the water temperature sensor 106 is greater than the first preset temperature value, the outlet of the compressor 101 is connected to the inlet of the first condenser 103. That is to say, when the temperature of the defrost water for cooling the second condenser 104 is low, the refrigerant of the compressor 101 flows to the second condenser 104. At this time, the second condenser 104 is water-cooled with high heat dissipation efficiency. During the heat dissipation process, the temperature of the defrost water gradually increases, which is not conducive to the heat dissipation of the second condenser 104. At this time, the flow direction of the refrigerant can be changed so that the refrigerant of the compressor 101 flows to the first condenser 103 until the defrost water in the evaporating dish 110 is naturally cooled to a temperature lower than the first preset temperature, and then the flow direction of the refrigerant can be switched again. Therefore, this embodiment uses defrost water with a lower temperature to water-cool the second condenser 104, thereby improving the heat exchange efficiency of the second condenser 104, reducing the condensation temperature and condensation pressure, and is beneficial to improving the refrigeration cycle efficiency of the refrigeration equipment 100; and by adding a first condenser 103 in parallel with the second condenser 104, when the defrost water temperature rises and reduces the cooling efficiency of the second condenser 104, the refrigerant flowing out of the compressor 101 is switched to be condensed by the first condenser 103, thereby ensuring the refrigeration effect of the refrigeration equipment 100.

If the temperature of the outside air is T2, the first preset temperature value may be T2+ΔT, where ΔT may be 3.

The first condenser 103 can be cooled by air or naturally. In this embodiment, in order to speed up the heat dissipation of the first condenser 103, a heat dissipation fan 109 is arranged near the first condenser 103, which is configured to accelerate the air flow around the first condenser 103 to quickly cool the first condenser 103.

Due to the size limitation of the evaporating dish 110, the second condenser 104 may adopt a microchannel condenser to ensure the heat exchange area of the second condenser 104 while reducing the space occupied by the second condenser 104. As shown in Figures 2 and 3, as is well known to those skilled in the art, a microchannel condenser may refer to a condenser formed by bending a condensing tube 1041 into a plurality of parallel and spaced flat sections, with heat dissipation fins formed between adjacent flat sections, and the heat dissipation fins between adjacent flat sections and the heat exchange medium flow channel. This type of condenser has high heat exchange efficiency and occupies less space.

Since the second condenser 104 is water-cooled, the design of the second condenser 104 needs to consider the anti-corrosion problem. In this embodiment, the outer surface of the second condenser 104 can be coated with an anti-corrosion layer 1042 or deposited with electrophoretic paint. Both structures can have a good anti-corrosion effect to prevent the second condenser 104 from being corroded. The anti-corrosion material can be polyethylene hot melt, heat shrink tubing, etc. As shown in Figure 2, the outer periphery of the condensation tube 1041 of the second condenser 104 can be sleeved with a polyethylene hot melt sleeve. As shown in Figure 3, the entire outer surface of the second condenser 104 is coated with polyethylene hot melt.

The first condenser 103 may also be a microchannel condenser or other types of condensers, which is not specifically limited in this embodiment.

Referring to FIG. 1 again, as those skilled in the art will appreciate, the refrigeration cycle system may generally further include a dew-removing pipe 120, a filter drier 130, a capillary tube 140, etc., which are sequentially connected between the outlet ends of the first condenser 103 and the second condenser 104 and the inlet end of the evaporator 102. That is, in the refrigerant flow direction, the compressor 101, the first condenser 103/the second condenser 104, the dew-removing pipe 120, the filter drier 130, and the capillary tube 140 are sequentially connected. The low-temperature and low-pressure refrigerant gas is compressed into a high-temperature and high-pressure gas by the compressor 101, enters the first condenser 103/the second condenser 104, and is condensed into a low-temperature and high-pressure gas-liquid two-phase region. Thereafter, it continues to cool down in the dew removal pipe 120 to form a certain degree of supercooling, and then passes through the drying filter 130 to enter the capillary tube 140, and enters the evaporator 102 through the throttling of the capillary tube 140. In the evaporator 102, the low-temperature and low-pressure refrigerant absorbs the heat of the storage compartment of the refrigeration equipment 100, and is then sucked back into the compressor 101, forming a refrigeration cycle.

The switching of the refrigerant flow direction can be realized by the electric valve 108 or the solenoid valve. Specifically, the electric valve 108 can be arranged on the refrigerant pipeline between the outlet of the compressor 101 and the first condenser 103 and the second condenser 104. The electric valve 108 is configured to control the connection between the outlet of the compressor 101 and the inlet of the second condenser 104 when the temperature value detected by the water temperature sensor 106 is less than or equal to the first preset temperature value, and to control the connection between the outlet of the compressor 101 and the inlet of the first condenser 103 when the temperature value detected by the water temperature sensor 106 is greater than the first preset temperature value. In this embodiment, the electric valve 108 or the solenoid valve is used to realize the automatic switching of the refrigerant flow direction when the conditions are met.

In some embodiments, the refrigeration cycle system may further include a first one-way valve 170 and a second one-way valve 180. The first one-way valve 170 is disposed on the refrigerant pipeline between the outlet of the first condenser 103 and the inlet of the evaporator 102, and is configured to promote the refrigerant at the outlet of the first condenser 103 to flow toward the inlet of the evaporator 102 when the inlet of the first condenser 103 is connected to the outlet of the compressor 101. The second one-way valve 180 is disposed on the refrigerant pipeline between the outlet of the second condenser 104 and the inlet of the evaporator 102, and is configured to promote the refrigerant at the outlet of the second condenser 104 to flow toward the inlet of the evaporator 102 when the inlet of the second condenser 104 is connected to the outlet of the compressor 101. In this embodiment, a first one-way valve 170 and a second one-way valve 180 are provided to prevent the refrigerant from flowing in the opposite direction when the first condenser 103 is connected to the compressor 101 or when the second condenser 104 is connected to the compressor 101, thereby ensuring that the refrigerant always flows toward the evaporator 102.

In some embodiments, the refrigeration cycle system further includes a water baffle 114, a cover plate 113 and a heating pipe 107. The water baffle 114 is located in the evaporation dish 110 and is configured to divide the evaporation dish 110 into a water evaporation zone 111 and a water cooling zone 112. The water cooling zone 112 is used to receive the defrost water discharged from the evaporator 102 by the defrost drain pipe 105. The second condenser 104 is arranged in the water cooling zone 112. The water temperature sensor 106 is arranged in the water cooling zone 112 and is configured to detect the temperature of the defrost water in the water cooling zone 112. The cover plate 113 is located above the water cooling zone 112 and is configured to cooperate with the water baffle 114 to close the water cooling zone 112, so that the defrost water with a lower temperature flows into the water cooling zone 112 to cool the second condenser 104. A part of the water vapor condenses into water droplets on the cover plate 113 and falls down, reducing the evaporation of the defrost water in the water cooling zone 112, so that the defrost water can be used to fully cool the second condenser 104.

An overflow port 115 may be defined between the cover plate 113 and the water baffle 114, and the excess defrost water in the water cooling area 112 may overflow into the water evaporation area 111, and a heating pipe 107 may be provided in the water evaporation area 111, which is connected between the outlet of the compressor 101 and the first condenser 103 and the second condenser 104. The refrigerant flowing out of the compressor 101 first enters the heating pipe 107, flows out of the heating pipe 107, and then enters the first condenser 103/the second condenser 104. In this way, the defrost water overflowing into the water evaporation area 111 can be evaporated by the refrigerant in the heating pipe 107, thereby achieving the effect of energy saving and consumption reduction.

FIG. 4 is a schematic diagram of a refrigeration device 100 according to an embodiment of the present invention.

According to another aspect of the present invention, the present invention also provides a refrigeration device 100. As mentioned above, the refrigeration device 100 can be a refrigerator, a freezer, or other equipment for refrigeration and freezing storage. The refrigeration device 100 of this embodiment includes a refrigeration cycle system, a box (not shown), a temperature sensor 150, and a controller 160, etc., of any of the above embodiments. A storage room is defined in the box, and the temperature sensor 150 is configured to detect the temperature in the storage room, and the controller 160 is configured to control the connection between the outlet of the compressor 101 and the inlet of the second condenser 104 when the temperature value detected by the water temperature sensor 106 of the refrigeration cycle system is less than or equal to the first preset temperature value, and is also configured to control the connection between the outlet of the compressor 101 of the refrigeration cycle system and the inlet of the first condenser 103 when the temperature value detected by the water temperature sensor 106 is greater than the first preset temperature value and the temperature value detected by the temperature sensor 150 is greater than the second preset temperature value.

That is to say, when the refrigeration cycle system is applied to the refrigeration equipment 100, the switching of the refrigerant in the refrigeration cycle system also needs to consider the cooling of the storage room. When the refrigerator starts to refrigerate, the defrost water flowing into the evaporating dish 110 has not yet exchanged heat with the second condenser 104, and the temperature is relatively low. At this time, the refrigerant flows to the second condenser 104, and water cooling is used to improve the heat dissipation efficiency of the second condenser 104. As the heat dissipation proceeds, the temperature of the defrost water gradually increases. If the temperature in the storage room reaches the set shutdown point, the machine shuts down normally. If the temperature in the storage room still does not reach the shutdown point, and the temperature of the defrost water rises to a certain level at this time, which is not conducive to the heat dissipation of the second condenser 104, the refrigerant needs to be switched to flow to the first condenser 103, and air cooling is used for heat dissipation. This cycle is repeated until the storage room reaches the set shutdown point. This ensures the heat dissipation efficiency of the first condenser 103/the second condenser 104, and avoids overcooling of the storage room.

The controller 160 can control the flow direction of the refrigerant by controlling the electric valve 108/solenoid valve disposed on the refrigerant pipeline between the outlet of the compressor 101 and the first condenser 103 and the second condenser 104 .

FIG5 is a schematic diagram of a control method of a refrigeration device 100 according to an embodiment of the present invention. As shown in FIG5 , this embodiment further provides a control method of a refrigeration device 100, including:

S102, detecting the temperature of the defrost water in the area where the second condenser 104 of the evaporating dish 110 is located;

S104, detecting the temperature in the storage room;

S106, if the temperature of the defrost water is less than or equal to the first preset temperature, connecting the outlet of the compressor 101 and the inlet of the second condenser 104;

S108 , if the temperature of the defrost water is greater than the first preset temperature, and the temperature in the storage room is greater than the second preset temperature, the outlet of the compressor 101 and the inlet of the first condenser 103 are connected.

The control method of this embodiment controls the flow direction of the refrigerant according to the temperature of the defrost water and the temperature of the storage compartment, thereby ensuring the heat dissipation efficiency of the first condenser 103 /the second condenser 104 and improving the overall refrigeration efficiency of the refrigeration device 100.

At this point, those skilled in the art should recognize that, although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived based on the content disclosed in the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and identified as covering all such other variations or modifications.

Claims (9)

1. A refrigeration cycle system of a refrigeration device, comprising:

a compressor;

An evaporator;

an evaporation pan for receiving defrost water from the evaporator discharged by a defrost drain pipe of a refrigeration device;

the inlet end of the first condenser is connected with the outlet end of the compressor, and the outlet end of the first condenser is connected with the inlet end of the evaporator;

the second condenser is arranged in the evaporation dish so as to radiate heat by using defrosting water in the evaporation dish, the inlet end of the second condenser is connected with the outlet end of the compressor, and the outlet end of the second condenser is connected with the inlet end of the evaporator;

the water temperature sensor is arranged in the evaporation pan and is configured to detect the temperature of defrosting water in the area where the second condenser is located in the evaporation pan;

the refrigeration cycle system is configured to switch the outlet end of the compressor to be communicated with the inlet end of the second condenser when the temperature value detected by the water temperature sensor is smaller than or equal to a first preset temperature value, and switch the outlet end of the compressor to be communicated with the inlet end of the first condenser when the temperature value detected by the water temperature sensor is larger than the first preset temperature value;

The refrigeration cycle system further includes:

the water baffle is positioned in the evaporation pan and is used for dividing the evaporation pan into a water evaporation area and a water cooling area, and the water cooling area is used for receiving the defrosting water discharged by the defrosting drain pipe from the evaporator;

The cover plate is positioned above the water cooling area and is arranged to be matched with the water baffle to seal the water cooling area, the second condenser is arranged in the water cooling area, and the water temperature sensor is arranged in the water cooling area and is configured to detect the temperature of defrosting water in the water cooling area;

And the heating pipe is connected between the outlet end of the compressor and the first condenser and the second condenser, is arranged in the water evaporation area, and is provided with an overflow port between the cover plate and the water baffle plate, so that when defrosting water in the water cooling area overflows into the water evaporation area, the heating pipe accelerates evaporation.

2. The refrigeration cycle system of claim 1, further comprising:

The electric valve is arranged on a refrigerant pipeline between the outlet end of the compressor and the first condenser and the second condenser;

The electric valve is configured to control the connection between the outlet end of the compressor and the inlet end of the second condenser when the temperature value detected by the water temperature sensor is smaller than or equal to the first preset temperature value, and control the connection between the outlet end of the compressor and the inlet end of the first condenser when the temperature value detected by the water temperature sensor is greater than the first preset temperature value.

3. The refrigeration cycle system of claim 1, further comprising:

The first one-way valve is arranged on a refrigerant pipeline between the outlet end of the first condenser and the inlet end of the evaporator and is configured to promote the refrigerant at the outlet end of the first condenser to flow towards the inlet end of the evaporator when the inlet end of the first condenser is communicated with the outlet end of the compressor;

the second one-way valve is arranged on the refrigerant pipeline between the outlet end of the second condenser and the inlet end of the evaporator and is configured to promote the refrigerant at the outlet end of the second condenser to flow towards the inlet end of the evaporator when the inlet end of the second condenser is communicated with the outlet end of the compressor.

4. The refrigeration cycle system of claim 1, wherein

The outer surface of the second condenser is coated with an anti-corrosion layer or is deposited with electrophoretic paint.

5. The refrigeration cycle system of claim 1, wherein

The second condenser is a microchannel condenser.

6. The refrigeration cycle system of claim 1, further comprising:

And the heat dissipation fan is arranged close to the first condenser and is configured to accelerate airflow around the first condenser so as to accelerate heat dissipation of the first condenser.

7. The refrigeration cycle system of claim 1, further comprising:

the dew removing pipe, the drying filter and the capillary tube are sequentially connected between the outlet end of the first condenser and the outlet end of the second condenser and the inlet end of the evaporator.

8. A refrigeration appliance comprising:

the refrigeration cycle system of any one of claims 1 to 7;

A box body, in which a storage compartment is defined;

a temperature sensor configured to detect a temperature within the storage compartment;

The controller is configured to control and conduct the outlet end of the compressor and the inlet end of the second condenser when the temperature value detected by the water temperature sensor of the refrigeration cycle system is smaller than or equal to a first preset temperature value, and also configured to control and conduct the outlet end of the compressor of the refrigeration cycle system and the inlet end of the first condenser when the temperature value detected by the water temperature sensor is larger than the first preset temperature value and the temperature value detected by the temperature sensor is larger than the second preset temperature value.

9. A control method of a refrigeration apparatus as recited in claim 8, the control method comprising:

Detecting the temperature of defrosting water in the area where the second condenser is located in the evaporation pan;

Detecting the temperature in the storage room;

If the temperature value of the defrosting water is smaller than or equal to a first preset temperature value, the outlet end of the compressor and the inlet end of the second condenser are conducted;

if the temperature value of the defrosting water is larger than a first preset temperature value, and the temperature value in the storage compartment is larger than a second preset temperature value, the outlet end of the compressor and the inlet end of the first condenser are conducted.