WO2013189076A1

WO2013189076A1 - Refrigeration device, refrigeration system and defrosting control method for refrigeration device

Info

Publication number: WO2013189076A1
Application number: PCT/CN2012/077343
Authority: WO
Inventors: 金皓基; 金松哲
Original assignee: 合肥华凌股份有限公司; 合肥美的电冰箱有限公司
Priority date: 2012-06-18
Filing date: 2012-06-21
Publication date: 2013-12-27
Also published as: CN102706021A

Abstract

A refrigeration device, a refrigeration system and a defrosting control method for the refrigeration device. The refrigeration system comprises: a first refrigeration branch(10), the first refrigeration branch comprises a first compressor(11), a first condenser(12) and a first evaporator(13) which are in serial connection; a second refrigeration branch(20), the second refrigeration branch(20) comprises a second compressor(21), a second condenser(22) and a second evaporator(23) which are in serial connection; a third condenser(30), the third condenser(30) is connected with the second refrigeration branch(20); and a switching unit(40), the switching unit(40) is connected with the second refrigeration branch(20) and is used for selectively causing a refrigerant in the second refrigeration branch(20) to pass by the third condenser(30), so as to heat the first evaporator(13) by the third condenser(30). The refrigeration system defrosts the evaporator by the condenser, no independently arranged electric heating defrosting device is required, the energy consumption is reduced and the safety of a defrosting process is increased.

Description

Refrigeration device and refrigeration system thereof, and defrosting control method of the same

The present invention relates to the field of refrigeration equipment, and in particular to a refrigeration apparatus and a refrigeration system and a defrosting control method of the same. Background technique

Existing water tanks, especially air-cooled water tanks, are usually defrosted by heating. The usual practice is to use electric heating to defrosting, for example, adding steel pipe heaters or aluminum near the evaporator. Tube heater or quartz tube heater, etc., defrosting, when using this defrosting method, the defrosting power is large, energy consumption is high, and in the event of electrical failure, it is easy to cause fire, and there is a certain safety hazard . Summary of the invention

The present invention aims to solve at least one of the technical problems existing in the prior art.

In view of the above, the present invention needs to provide a refrigeration system that can defrost the evaporator through a condenser to improve defrosting efficiency and ensure safety during defrosting. Further, the present invention needs to provide a refrigerating apparatus having the above-described refrigerating system, wherein the refrigerating apparatus has a small defrosting power and a high safety factor at least during defrosting. Further, the present invention is also required to provide a defrosting control method of the refrigeration apparatus.

According to a first aspect of the present invention, a refrigeration system is provided, comprising: a first refrigeration branch, the first refrigeration branch including a first compressor, a first condenser, and a first evaporator connected in series; a cooling branch, the second cooling branch includes a second compressor, a second condenser, and a second evaporator connected in series; a third condenser, the third condenser being connected in the second cooling branch a switching unit connected in the second cooling branch for selectively passing refrigerant in the second cooling branch through the third condenser to pass the third condensation The heater heats the first evaporator.

According to the refrigeration system of the embodiment of the present invention, when it is required to defoase the first evaporator, the switching unit can be operated to pass the refrigerant through the third condenser. Thereby, the first evaporator can be defrosted by utilizing the heat energy transferred from the third condenser.这种 With this defrosting method, it is not necessary to separately provide an electric heating defrosting device, which reduces energy consumption and improves the safety of the defrosting process. At the same time, since the first evaporator is defrosted by the third condenser, the temperature of the refrigerant flowing through the third condenser can be lowered, and the working efficiency of the second refrigeration branch is improved. Therefore, the refrigeration system according to the embodiment of the present invention has higher work efficiency and defrosting efficiency.

According to an embodiment of the present invention, the switching unit has first to third interfaces, the third condenser is connected in parallel with the second condenser, and the first interface of the switching unit and the first The outlets of the two compressors are connected and the second and third ports of the switching unit are connected to the inlets of the second and third condensers, respectively.

According to an embodiment of the present invention, a first interface of the switching unit is connected to an outlet of the second condenser, a second interface of the switching unit is connected to an inlet of the third condenser, and the A third interface of the switching unit is coupled to the outlet of the third condenser and the inlet of the second evaporator. According to an embodiment of the present invention, a first interface of the switching unit is connected to an outlet of the second compressor, and a second interface of the switching unit is connected to an inlet of the third condenser, the switching unit A third interface is coupled to the outlet of the third condenser and the inlet of the second condenser.

According to an embodiment of the invention, the switching unit is switched wide.

According to an embodiment of the invention, the switching is broadly electromagnetic wide.

According to an embodiment of the present invention, the refrigeration system further includes a temperature sensor for detecting a temperature of the first evaporator, wherein the switching unit makes the temperature when the temperature detected by the temperature sensor is lower than a first predetermined temperature The refrigerant in the second refrigeration branch passes through the third condenser to heat the first evaporator, and when the temperature detected by the temperature sensor is higher than a second predetermined temperature, the switching unit causes the The refrigerant in the second refrigeration branch passes through the third condenser to stop heating the first evaporator.

According to an embodiment of the present invention, the refrigeration system further includes a frost amount sensor for detecting a frost amount on the first evaporator, wherein when the frost amount detected by the frost amount sensor is greater than the first predetermined frost amount The switching unit passes the refrigerant in the second cooling branch through the third condenser to heat the first evaporator, and when the amount of frost detected by the frost amount sensor is less than the second predetermined frost amount The switching unit causes the refrigerant in the second refrigeration branch to bypass the third condenser to stop heating the first evaporator.

According to an embodiment of the invention, the third condenser is disposed adjacent to the first evaporator.

According to an embodiment of the invention, the third condenser is a coil condenser, and the coil of the third condenser is wound around the first evaporator.

According to an embodiment of the invention, the third condenser is placed in close proximity to the first evaporator.

According to a second aspect of the present invention, a refrigeration apparatus is provided, comprising: a casing having first and second refrigerating compartments; a tank door connected to the casing to open and Closing the refrigerating compartment; and a refrigeration system, the refrigeration system being disposed in the casing and being the refrigeration system according to the above embodiment of the present invention, the first and second refrigeration branches of the refrigeration system Respectively cooling the first and second refrigerating compartments, respectively.

According to the refrigeration apparatus of the embodiment of the present invention, the first evaporator in the first cooling branch can be made by the third condenser connected to the second cooling branch by providing the first cooling branch and the second cooling branch. Defrost treatment, using this defrosting method, does not require a separate electric heating defrosting device, which reduces energy consumption and improves the safety of the defrosting process. At the same time, since the third evaporator is used to defrost the first evaporator, the temperature of the refrigerant flowing through the third condenser can be lowered, and the working efficiency of the second refrigeration branch is improved. Therefore, the refrigeration system according to an embodiment of the present invention has higher work efficiency and defrosting efficiency.

According to an embodiment of the invention, the first refrigerating compartment is a freezing compartment, and the second refrigerating compartment is a refrigerating compartment. According to a third aspect of the present invention, there is provided a defrosting control method for a refrigerating apparatus, comprising the steps of: a) determining whether the first evaporator requires defrosting; b) when the first evaporator requires defrosting And the switching unit passes the refrigerant in the second cooling branch through the third condenser to heat the first evaporator to defrost the first evaporator; c) when the first When the evaporator does not require defrosting, the switching unit bypasses the refrigerant in the second refrigeration branch through the first evaporator to stop defrosting the first evaporator.

According to the defrosting control method of the refrigerating apparatus according to the embodiment of the present invention, the thermal energy radiated outward by the third condenser can be utilized, Defrost the first evaporator.这种With this defrosting method, it is not necessary to separately provide an electric heating defrosting device, which reduces energy consumption and improves the safety of the defrosting process. At the same time, since the third evaporator is used to defrost the first evaporator, the temperature of the refrigerant flowing through the third condenser can also be lowered, and the working efficiency of the second refrigeration branch is improved. Therefore, the refrigeration system according to an embodiment of the present invention has higher work efficiency and defrosting efficiency.

According to an embodiment of the invention, it is determined in step a) whether the first evaporator requires defrosting by detecting the temperature of the first evaporator and/or detecting the amount of frost on the first evaporator.

The additional aspects and advantages of the invention will be set forth in part in the description which follows. DRAWINGS

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from

1 shows a schematic structural view of a refrigeration system according to an embodiment of the present invention;

2 is a schematic structural view of a refrigeration system according to another embodiment of the present invention;

Figure 3 is a block diagram showing the structure of a refrigeration system according to still another embodiment of the present invention;

Figure 4 is a block diagram showing the structure of a refrigeration system in accordance with one embodiment of the present invention;

FIG. 5 shows a flow chart of a defrosting control method of a refrigeration apparatus according to an embodiment of the present invention. detailed description

The embodiments of the present invention are described in detail below, and the examples of the embodiments are illustrated in the drawings, wherein the same or similar reference numerals are used to refer to the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the drawings are intended to be illustrative only and not to limit the invention.

In the description of the present invention, it is to be understood that the terms "center", "vertical", "transverse", "upper", "lower", "previous", "rear", "left", "right", " The orientation or positional relationship of the indications "upright", "horizontal", "top", "bottom", "inside", "outside" and the like is based on the orientation or positional relationship shown in the drawings, for convenience of description of the present invention and simplification. It is to be understood that the invention is not to be construed as a limitation Moreover, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that the terms "installation", "connected", and "connected" are to be understood broadly, and may be fixed or detachable, for example, unless otherwise explicitly defined and defined. Connected, or connected integrally; can be mechanical or electrical; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of the two components. The specific meaning of the above terms in the present invention can be understood by those skilled in the art in a specific case.

Next, a refrigeration system according to an embodiment of the present invention will be described first with reference to Figs.

As shown in FIGS. 1-3, a refrigeration system according to an embodiment of the present invention includes: a first cooling branch 10, a second cooling branch 20, a third condenser 30, and a switching unit 40. Specifically, the first refrigeration branch 10 includes a first compressor 11, a first condenser 12, and a first evaporator connected in series

13.

The second refrigeration branch 20 includes a second compressor 21, a second condenser 22, and a second evaporator 23 connected in series.

It should be noted that the first cooling branch 10 and the second cooling branch 20 may be mutually independent refrigeration circuits, so that different cooling rooms may be separately cooled.

The third condenser 30 can be connected in the second refrigeration branch 20. In other words, a third condenser 30 is also connected to the second refrigeration branch 20.

The switching unit 40 is connected in the second cooling branch 20 for selectively passing the refrigerant in the second cooling branch 20 through the third condenser 30 to heat the first evaporator 13 through the third condenser 30 to When the first evaporator 13 needs to be defrosted, the first evaporator 13 is heated and defrosted. In other words, the third condenser 30 can selectively pass the refrigerant through the third condenser through the switching of the first interface 41, the second interface 42, and the third interface 43 that the switching unit 40 has. 30, so that the third condenser 30 transfers heat energy outward to perform defrosting treatment on the first evaporator 13.

According to the refrigeration system of the embodiment of the present invention, when it is required to defoase the first evaporator 13, the switching unit 40 can be operated to pass the refrigerant through the third condenser 30. Thereby, the first evaporator 13 can be defrosted by the heat energy radiated from the third condenser 30.这种 With this defrosting method, it is not necessary to separately provide an electric heating defrosting device, which reduces energy consumption and improves the safety of the defrosting process. At the same time, since the first evaporator 13 is defrosted by the third condenser 30, the temperature of the refrigerant flowing through the third condenser 30 can be lowered, and the working efficiency of the second refrigeration branch can be improved. Therefore, the refrigeration system according to an embodiment of the present invention has higher work efficiency and defrosting efficiency.

As shown in FIG. 1, according to an embodiment of the present invention, the switching unit 40 has a first interface 41, a second interface 42 and a third interface 43, the third condenser 30 is connected in parallel with the second condenser 22, and the switching unit 40 The first interface 41 is connected to the outlet 211 of the second compressor 21 and the second interface 42 and the third interface 43 of the switching unit 40 are connected to the inlets of the second condenser 22 and the third condenser 30, respectively. Thereby, control of the operational states of the second condenser 22 and the third condenser 30 can be achieved.

It should be noted that the second condenser 22 and the third condenser 30 can be selectively connected by controlling the switching of the second interface 42 and the third interface 43 of the switching unit 40 (for example, switching width, preferably battery width). In the second refrigeration branch. For example, opening the first interface 41 and the second interface 42, closing the third interface 43, allows the second condenser 22 to be connected to the second cooling branch 20. Opening the first interface 41 and the third interface 43 and closing the second interface 42 can connect the third condenser 30 to the second cooling branch 20, and the heat generated by the third condenser 30 can be applied to the first evaporator. 13 defrosting.

As shown in FIG. 2, according to another embodiment of the present invention, the first interface 41 of the switching unit 40 is connected to the outlet of the second condenser 22, and the second interface 42 of the switching unit 40 and the third condenser 30 are The inlets are connected, and the third port 43 of the switching unit 40 is connected to the outlet of the third condenser 30 and the inlet of the second evaporator 23. Thereby, the second condenser 22 and the third condenser 30 can be selectively connected to the second cooling branch 20 by controlling the opening and closing of the second interface 42 and the third interface 43 of the switching unit 40. When the second condenser 22 is connected to the second cooling branch 20, the second cooling branch 20 performs normal cooling, and when the third condenser 30 is connected to the second cooling branch 20, the second cooling branch 20 Normal cooling can be performed, and the first evaporator 13 in the first cooling branch 10 can also be defrost by the third condenser 30, thereby improving the cooling efficiency of the refrigeration system. It should be noted that, as shown in FIG. 4, a first capillary 91 may be connected to the first cooling branch 10, and a second capillary 92 may be connected to the second cooling branch 20. The first capillary 91 may be connected to the first capillary 91. Between a condenser 12 and the first evaporator 13, a second capillary 92 may be connected between the second condenser 22 and the third condenser 30 and the second evaporator 23. The first capillary 91 and the second capillary 92 may also be connected in series to a drying tube (not shown). Thereby, the cooling efficiency of the water tank can be improved. A first unidirectional width 101 and a second unidirectional width 102 may be disposed in the second cooling branch 20, and the first unidirectional width 101 may be connected between the second cold trap 22 and the second capillary 92, the second single The width 102 can be connected between the third condenser 30 and the second capillary 92. Thereby, when the one of the second condenser 22 and the third condenser 30 is connected to the second cooling branch 20, the second cooling branch 20 can be unidirectionally turned on.

As shown in FIG. 3, according to still another embodiment of the present invention, the first interface 41 of the switching unit 40 is connected to the outlet of the second compressor 21, and the second interface 42 of the switching unit 40 is connected to the inlet of the third condenser 30. The third interface 43 of the switching unit 40 is connected to the outlet of the third condenser 30 and the inlet of the second condenser 22. Thereby, the second condenser 22 and the third condenser 30 can be selectively connected to the second cooling branch 20 by controlling the opening and closing of the second port 42 and the third port 43 of the switching unit 40. When the second condenser 22 is connected to the second cooling branch 20, the second cooling branch 20 performs normal cooling, and when the third condenser 30 is connected to the second cooling branch 20, the second cooling branch 20 Normal cooling can be performed, and the first evaporator 13 in the first cooling branch 10 can also be defrost by the third condenser 30, thereby improving the cooling efficiency of the refrigeration system.

According to an embodiment of the present invention, the refrigeration system may further include a temperature sensor (not shown) for detecting the temperature of the first evaporator 13, wherein the switching unit 40 when the temperature detected by the temperature sensor is lower than the first predetermined temperature The refrigerant in the second refrigeration branch 20 is passed through the third condenser 30 to heat the first evaporator 13, and the switching unit 40 causes the second refrigeration branch 20 when the temperature detected by the temperature sensor is higher than the second predetermined temperature. The refrigerant inside passes through the third condenser 30 to stop heating the first evaporator 13. Thereby, the defrosting of the first evaporator 13 can be controlled by judging the temperature, and the first evaporator 13 can be defrosted in time to improve the working efficiency of the first evaporator 13.

According to an embodiment of the present invention, the refrigeration system may further include a frost amount sensor (not shown) for detecting the amount of frost on the first evaporator 13, wherein the amount of frost detected by the frost amount sensor is greater than the first predetermined frost The quantity-time switching unit 40 passes the refrigerant in the second cooling branch 20 through the third condenser 30 to heat the first evaporator 13, and when the amount of frost detected by the frost amount sensor is less than the second predetermined amount of frost The switching unit 40 passes the refrigerant in the second cooling branch 20 through the third condenser 30 to stop heating the first evaporator 13. Thereby, by selectively detecting the amount of frost on the first evaporator 13, the defrosting operation can be performed, whereby the working efficiency of the refrigeration system can be improved, and the defrosting effect can be improved.

According to an embodiment of the present invention, the third condenser 30 may be disposed adjacent to the first evaporator 13. Thereby, the heat of the third condenser 30 can be better transmitted to the first evaporator to achieve defrosting of the first evaporator 13 when defrosting of the first evaporator 13 is required.

Preferably, the third condenser 30 may be a coil condenser, and the coil of the third condenser 30 is wound around the first evaporator 13. Thereby, the first evaporator 13 can be heated by the coil of the third condenser 30 to defrost the first evaporator 13. Alternatively, the third condenser 30 may also be placed in close proximity to the first evaporator 13 to more effectively defrost the first evaporator 13.

The operation of the refrigeration system according to an embodiment of the present invention will now be described with reference to Figs. 1-3. When the refrigeration system is in a normal operating state, the second condenser 22 is connected to the second refrigeration branch 20, and the third condenser 30 is disconnected from the second refrigeration branch 20. At this time, the first cooling branch 10 and the second cooling branch 20 are normally cooled.

When the first evaporator 13 needs to be defrosted, the third condenser 30 is connected to the second refrigeration branch 20, the second condenser 22 is disconnected from the second refrigeration branch 20, and the third condenser 30 utilizes itself outward. The radiated heat defrosts the first evaporator 13. During the defrosting process, the first cooling branch 10 can be stopped, and the second cooling branch 20 can be in a normal working state.

Next, a refrigeration apparatus according to an embodiment of the present invention will be described.

A refrigeration apparatus (not shown) according to an embodiment of the present invention includes: a tank, a tank door, and a refrigeration system.

In particular, the tank may have first and second refrigerating compartments. For example, the first refrigerating compartment may be a freezing compartment and the second refrigerating compartment may be a refrigerating compartment.

The door is connected to the case to open and close the refrigerating compartment.

The refrigeration system is disposed in the tank and is the refrigeration system according to the above embodiment of the present invention. The first cooling branch 10 and the second cooling branch 20 of the refrigeration system are respectively used for the first refrigerating compartment and the second Refrigeration compartment cooling.

According to the refrigeration apparatus of the embodiment of the present invention, by providing the first cooling branch 10 and the second cooling branch 20, the third condenser 30 connected to the second cooling branch 20 can be utilized in the first cooling branch 10. The first evaporator 13 performs defrosting treatment, and the defrosting method is used, and it is not necessary to separately provide an electric heating defrosting device, thereby reducing energy consumption and improving the safety of the defrosting process. At the same time, since the first evaporator 13 is defrosted by the third condenser 30, the temperature of the refrigerant flowing through the third condenser 30 can be lowered, and the working efficiency of the second refrigeration branch can be improved. Therefore, the refrigeration system according to the embodiment of the present invention has higher work efficiency and defrosting efficiency.

Next, a defrosting control method of a refrigerating apparatus according to an embodiment will be described with reference to FIG.

As shown in FIG. 5, the defrosting control method of the refrigerating apparatus according to the embodiment of the present invention includes the following steps: a) judging whether the first evaporator needs defrosting (S10).

For example, the amount of frost on the first evaporator can be indirectly detected or directly detected by a temperature sensor or a defrosting sensor.

In one embodiment of the invention, it is determined, for example, whether the first evaporator requires defrosting by detecting the temperature of the first evaporator and/or detecting the amount of frost on the first evaporator. Thereby, the defrosting efficiency can be improved.

b) when the first evaporator requires defrosting, the switching unit passes the refrigerant in the second refrigeration branch through the third condenser to heat the first evaporator to thereby evaporate The device performs defrosting (S20).

c) when the first evaporator does not require defrosting, for example, by a temperature sensor or a defrosting sensor, the switching unit causes the refrigerant in the second cooling branch to be adjacent when defrosting is not required The defrosting of the first evaporator is stopped by the first evaporator (S30).

According to the defrosting control method of the refrigerating apparatus according to the embodiment of the present invention, the first evaporator 13 can be defrost by utilizing the heat energy radiated from the third condenser 30.这种 With this defrosting method, it is not necessary to separately provide an electric heating defrosting device, which reduces energy consumption and improves the safety of the defrosting process. At the same time, since the first evaporator 13 is defrosted by the third condenser 30, the temperature of the refrigerant flowing through the third condenser 30 can be lowered, and the working efficiency of the second refrigeration branch can be improved. Therefore, the refrigeration system according to an embodiment of the present invention has higher work efficiency and defrosting efficiency.

In the description of the present specification, the terms "one embodiment", "some embodiments", "illustrative embodiments", "show" The description of the ",""specificexamples", or "some examples" and the like is intended to mean that the specific features, structures, materials, or characteristics described in connection with the embodiments or examples are included in the at least one embodiment or example. The above description of the terminology does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be in a suitable manner in any one or more embodiments or examples. Combine.

While the embodiments of the present invention have been shown and described, the embodiments of the invention may The scope of the invention is defined by the claims and their equivalents.

Claims

claims

1. A refrigeration system, characterized by including:

A first refrigeration branch, the first refrigeration branch includes a first compressor, a first condenser and a first evaporator in series;

A second refrigeration branch, the second refrigeration branch includes a second compressor, a second condenser and a second evaporator in series;

A third condenser, the third condenser is connected in the second refrigeration branch; and

A switching unit, the switching unit is connected to the second refrigeration branch and is used to selectively allow the refrigerant in the second refrigeration branch to pass through the third condenser so as to pass through the third condenser. The first evaporator is heated.

2. The refrigeration system according to claim 1, characterized in that: the switching unit has first to third interfaces, the third condenser and the second condenser are connected in parallel, and the third condenser of the switching unit An interface is connected to the outlet of the second compressor and second and third interfaces of the switching unit are connected to the inlets of the second and third condensers respectively.

3. The refrigeration system according to claim 1, characterized in that, the first interface of the switching unit is connected to the outlet of the second condenser, and the second interface of the switching unit is connected to the third condenser. The third interface of the switching unit is connected to the outlet of the third condenser and the inlet of the second evaporator.

4. The refrigeration system according to claim 1, characterized in that, the first interface of the switching unit is connected to the outlet of the second compressor, and the second interface of the switching unit is connected to the third condenser. is connected to the inlet of the switching unit, and the third interface of the switching unit is connected to the outlet of the third condenser and the inlet of the second condenser.

5. The refrigeration system according to claim 1, wherein the switching unit is a switching switch.

6. The refrigeration system according to claim 5, characterized in that the switching switch is an electromagnetic switch.

7. The refrigeration system according to claim 1, further comprising a temperature sensor for detecting the temperature of the first evaporator, wherein when the temperature detected by the temperature sensor is lower than a first predetermined temperature The switching unit causes the refrigerant in the second refrigeration branch to pass through the third condenser to heat the first evaporator, and when the temperature detected by the temperature sensor is higher than a second predetermined temperature, The switching unit causes the refrigerant in the second refrigeration branch to bypass the third condenser to stop heating the first evaporator.

8. The refrigeration system according to claim 1, further comprising a frost amount sensor for detecting the amount of frost on the first evaporator, wherein when the amount of frost detected by the frost amount sensor is greater than the amount of frost on the first evaporator, When a predetermined amount of frost occurs, the switching unit causes the refrigerant in the second refrigeration branch to pass through the third condenser to heat the first evaporator, and when the amount of frost detected by the frost amount sensor is small, When the second predetermined amount of frost occurs, the switching unit causes the refrigerant in the second refrigeration branch to bypass the third condenser to stop heating the first evaporator.

9. The refrigeration system according to any one of claims 1 to 8, wherein the third condenser is disposed adjacent to the first evaporator.

10. The refrigeration system according to claim 9, wherein the third condenser is a coil condenser, and the coil of the third condenser is wound around the first evaporator.

11. The refrigeration system according to claim 9, wherein the third condenser is disposed close to the first evaporator.

12. A refrigeration equipment, characterized by including:

A box with first and second refrigeration compartments;

a box door connected to the box body to open and close the refrigeration compartment; and

Refrigeration system, the refrigeration system is provided in the box and is the refrigeration system according to any one of claims 1-11, the first and second refrigeration branches of the refrigeration system are respectively used to refrigerate the refrigeration system. The first and second refrigeration compartments are refrigerated.

13. The refrigeration equipment according to claim 12, wherein the first refrigeration compartment is a freezing compartment, and the second refrigeration compartment is a refrigeration compartment.

14. A defrost control method for refrigeration equipment according to claim 12 or 13, characterized in that it includes the following steps:

a) Determine whether the first evaporator needs defrosting;

b) When the first evaporator needs to be defrosted, the switching unit causes the refrigerant in the second refrigeration branch to pass through the third condenser to heat the first evaporator to thereby improve the first evaporator. Defrost the device;

c) When the first evaporator does not need to be defrosted, the switching unit causes the refrigerant in the second refrigeration branch to bypass the first evaporator to stop defrosting the first evaporator. .

15. The defrost control method according to claim 14, characterized in that, in step a), the temperature of the first evaporator is detected and/or the amount of frost on the first evaporator is detected. Whether the first evaporator needs defrost.