Refrigeration equipment and control method and control device thereof

Abstract

The invention provides refrigeration equipment and a control method and device thereof. The refrigeration equipment comprises an inner container, and the inner container is provided with a storage cavity and an opening formed in the top of the inner container; the first evaporator and the second evaporator are arranged on the outer side of the inner container, and in the vertical direction, the first evaporator is located on the lower side of the second evaporator; the valve group is used for controlling a refrigerant to flow between the first evaporator and the second evaporator; wherein the refrigeration equipment has a first refrigeration state and a second refrigeration state; when the refrigeration equipment is in the first refrigeration state, the valve group controls the refrigerant to flow in the first evaporator and the second evaporator; and when the refrigeration equipment is in the second refrigeration state, the valve group controls the refrigerant to flow only in the first evaporator.

Description

Technical Field

[0001] The present application relates to the field of refrigeration technology, and in particular to refrigeration equipment and a control method and a control device thereof. Background Art

[0002] The energy consumption of refrigerators and other refrigeration equipment is an indicator that users pay more attention to. Reducing energy consumption is an important research topic for refrigeration equipment to meet user needs and energy-saving needs. Top-opening refrigerators are a common type of refrigeration equipment. Due to their large capacity, they are favored in cold storage, catering and other scenarios. However, when storing some items, they are placed in the bottom area of ​​the refrigerator; when refrigeration is required, the refrigerator needs to provide cooling for its entire space, resulting in a mismatch between the cooling provided and the cooling demand, resulting in cooling waste and high energy consumption. Summary of the invention

[0003] The main purpose of the present application is to provide a refrigeration device and a control method and a control device thereof, aiming to solve the technical problems of waste of cooling capacity and high energy consumption of top-opening refrigeration devices in the prior art.

[0004] In a first aspect, the present application provides a refrigeration device, comprising:

[0005] An inner liner, the inner liner having a storage cavity and an opening disposed at a top of the inner liner;

[0006] a first evaporator and a second evaporator, wherein the first evaporator and the second evaporator are disposed outside the inner container, and in a vertical direction, the first evaporator is located below the second evaporator; and

[0007] A valve group, the valve group is used to control the flow of refrigerant in the first evaporator and the second evaporator; wherein the refrigeration device has a first refrigeration state and a second refrigeration state; when the refrigeration device is in the first refrigeration state, the valve group controls the refrigerant to flow in the first evaporator and the second evaporator; when the refrigeration device is in the second refrigeration state, the valve group controls the refrigerant to flow only in the first evaporator.

[0008] Optionally, the valve group includes a first expansion valve, a second expansion valve and a valve; the first expansion valve is connected in series with the first evaporator to form a first refrigerant flow path; the second expansion valve, the second evaporator and the valve are connected in series to form a second refrigerant flow path; and the first expansion valve is connected in parallel with the second refrigerant flow path; the first evaporator and the second evaporator are arranged in series;

[0009] Wherein, when the refrigeration device is in the first refrigeration state, the valve is in an open state and the second expansion valve is in an open state; when the refrigeration device is in the second refrigeration state, the valve is in a closed state and the first expansion valve is in an open state.

[0010] Optionally, when the refrigeration device is in the first refrigeration state, the first expansion valve is in a closed state.

[0011] Optionally, the valve group includes a first expansion valve, a second expansion valve and a valve; the first expansion valve is connected in series with the first evaporator to form a first refrigerant flow path; the second expansion valve, the second evaporator and the valve are connected in series to form a second refrigerant flow path; and the first expansion valve is connected in parallel with the second refrigerant flow path; the first evaporator and the second evaporator are arranged in parallel;

[0012] Wherein, when the refrigeration device is in the first refrigeration state, the valve is in an open state, and the second expansion valve and the first expansion valve are in an open state; when the refrigeration device is in the second refrigeration state, the valve is in a closed state, and the first expansion valve is in an open state.

[0013] Optionally, the valve group further includes a one-way valve, which is disposed in the second refrigerant flow path and is configured to prevent the refrigerant from flowing to the second evaporator when the refrigeration device is in the second refrigeration state.

[0014] Optionally, the refrigeration equipment further comprises a compressor and a condenser; the condenser is connected to the compressor;

[0015] The condenser is connected to the first evaporator and the second evaporator, and is used to provide condensed refrigerant to the first evaporator and the second evaporator;

[0016] The first evaporator and the second evaporator are connected to the compressor, and the compressor is used to pressurize the refrigerant after the heat exchange between the first evaporator and the second evaporator.

[0017] Optionally, the first evaporator and the second evaporator both include heat exchange tubes, and the heat exchange tubes are wound around the outer surface of the inner tank.

[0018] In a second aspect, the present application further proposes a control method for a refrigeration device, which is used to control the refrigeration device as described above, and the control method comprises:

[0019] Get the current storage capacity in the liner;

[0020] When the current storage capacity is less than a preset capacity, controlling the refrigeration device to operate in the second refrigeration state;

[0021] When the current storage capacity is greater than the preset capacity, the refrigeration device is controlled to operate in the first refrigeration state.

[0022] In a third aspect, the present application further proposes a control device for a refrigeration device, which is used to control the refrigeration device as described above, and the control device comprises:

[0023] An acquisition module is used to obtain the current storage capacity of the inner tank;

[0024] a control module, configured to control the refrigeration device to operate in the second refrigeration state when the current storage capacity is less than a preset capacity;

[0025] The control module is further configured to control the refrigeration device to operate in the first refrigeration state when the current storage capacity is greater than the preset capacity.

[0026] In the technical solution of the embodiment of the present application, the inner tank of the refrigeration device has a top-opening opening, and the user places the items to be stored into the storage cavity from the opening; the first evaporator and the second evaporator are arranged on the outside of the inner tank to provide cold energy to the inner tank; and the first evaporator is arranged on the lower side of the second evaporator in the vertical direction; when the refrigeration device is in the first refrigeration state, the valve group controls the refrigerant to flow in the first evaporator and the second evaporator, and then the first evaporator and the second evaporator simultaneously provide cold energy to the inner tank; and when the refrigeration device is in the second refrigeration state, the valve group controls the refrigerant to flow only in the first evaporator. Since the items are gradually accumulated from bottom to top, when there are more items, the refrigeration device can operate in the first refrigeration state and provide cold energy to most areas of the inner tank; and when there are fewer items, the refrigeration can operate in the second refrigeration state and only provide cold energy to the bottom area of ​​the inner tank, so that when there are fewer stored items, the provided cold energy can be concentrated in the bottom area, and the cold energy supply and demand matching degree is high, reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0028] Figure 1 A schematic diagram of the refrigeration principle structure of a refrigeration device provided in an embodiment of the present application Figure 1 ;

[0029] Figure 2 A schematic diagram of the structure of a refrigeration device provided in an embodiment of the present application;

[0030] Figure 3 A schematic diagram of the refrigeration principle structure of a refrigeration device provided in an embodiment of the present application Figure 2 ;

[0031] Figure 4 A schematic diagram of the refrigeration principle structure of a refrigeration device provided in an embodiment of the present application Figure 3 ;

[0032] Figure 5 A schematic diagram of the refrigeration principle structure of a refrigeration device provided in an embodiment of the present application Figure 4 ;

[0033] Figure 6 A schematic flow chart of a control method for a refrigeration device provided in an embodiment of the present application;

[0034] Figure 7 A schematic flow chart of a control device for a refrigeration device provided in an embodiment of the present application.

[0035] Reference numerals list

[0036] 110 Liner 144 Check valve 120 First evaporator 150 Condenser 130 Second evaporator 160 compressor 140 Valve Group 170 Filter drier 141 First expansion valve 210 Get Module 142 valve 220 Control Module 143 Second expansion valve DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0038] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0039] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0040] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0041] Combination Figure 1 and Figure 2 As shown, the embodiment of the present application provides a refrigeration device, including:

[0042] An inner liner 110, wherein the inner liner 110 has a storage cavity and an opening disposed at the top of the inner liner 110;

[0043] a first evaporator 120 and a second evaporator 130, wherein the first evaporator 120 and the second evaporator 130 are disposed outside the inner container 110, and in a vertical direction, the first evaporator 120 is located below the second evaporator 130; and

[0044] A valve group 140, wherein the valve group 140 is used to control the flow of refrigerant in the first evaporator 120 and the second evaporator 130; wherein the refrigeration device has a first refrigeration state and a second refrigeration state; when the refrigeration device is in the first refrigeration state, the valve group 140 controls the flow of the refrigerant in the first evaporator 120 and the second evaporator 130; when the refrigeration device is in the second refrigeration state, the valve group 140 controls the flow of the refrigerant only in the first evaporator 120.

[0045] In the technical solution of the embodiment of the present application, the inner tank 110 of the refrigeration device has a top-opening opening, and the user places the items to be stored into the storage cavity through the opening; the first evaporator 120 and the second evaporator 130 are arranged on the outside of the inner tank 110 to provide cooling to the inner tank 110; and the first evaporator 120 is placed on the lower side of the second evaporator 130 in the vertical direction; the valve group 140 controls the refrigerant to flow in the first evaporator 120 and the second evaporator 130 when the refrigeration device is in the first refrigeration state, and then the first evaporator 120 and the second evaporator 130 simultaneously provide cooling to the inner tank 110; and the valve group 140 controls the refrigerant to flow only in the first evaporator 120 when the refrigeration device is in the second refrigeration state. As items gradually accumulate from bottom to top, when there are more items, the refrigeration equipment can operate in the first refrigeration state and provide cold air to most areas of the inner tank 110; when there are fewer items, the refrigeration equipment can operate in the second refrigeration state and only provide cold air to the bottom area of ​​the inner tank 110, so that when there are fewer stored items, the provided cold air can be concentrated in the bottom area, with a high matching degree between cold air supply and demand, thereby reducing energy consumption.

[0046] In some embodiments, Figure 2 As shown, the first evaporator 120 is arranged corresponding to the lower half of the inner tank 110, and the second evaporator 130 is arranged corresponding to the upper half of the inner tank 110. In this embodiment, the refrigeration device can be half-box refrigeration and full-box refrigeration; when half-box refrigeration is used, the valve group 140 controls the refrigerant to flow only in the first evaporator 120, so as to be used in the case where the storage capacity of items is less than or close to half of the capacity of the inner tank 110; when full-box refrigeration is used, the valve group 140 controls the refrigerant to flow in the first evaporator 120 and the second evaporator 130, so as to be used in the case where the storage capacity of items is greater than half of the capacity of the inner tank 110. Therefore, the refrigeration device in this embodiment can switch between half-box refrigeration (second refrigeration state) and full-box refrigeration (first refrigeration state) according to the capacity of the items placed in the inner tank 110, which helps to balance the supply and demand of cooling capacity and reduce energy consumption.

[0047] For example, in some application scenarios, consumers or users only need a small amount of frozen products; in the prior art, the whole box needs to be started to refrigerate to freeze the products, which consumes a lot of energy and takes a long time to freeze; in the technical solution of the present application, half the box can be used to start refrigeration to freeze the products, so that the cold supply is concentrated on the bottom of the lower inner tank 110, which consumes less energy and shortens the freezing time, thereby reducing costs and increasing efficiency.

[0048] In an embodiment, the inner tank 110 may be a refrigerated inner tank 110, a frozen inner tank 110, or a refrigerated and frozen inner tank 110. The inner tank 110, the first evaporator 120, the second evaporator 130, and the valve group 140 are placed in a space defined by a shell of the refrigeration device. In an embodiment, the refrigeration device further includes a controller, which is used to control the refrigeration device to switch between a first refrigeration state and a second refrigeration state, that is, the controller is used to output a control instruction to the valve group 140.

[0049] In some other optional embodiments of the present application, such as Figure 3 As shown, the valve group 140 includes a first expansion valve 141, a second expansion valve 143 and a valve 142; the first expansion valve 141 is connected in series with the first evaporator 120 to form a first refrigerant flow path; the second expansion valve 143, the second evaporator 130 and the valve 142 are connected in series to form a second refrigerant flow path; and the first expansion valve 141 is connected in parallel with the second refrigerant flow path; the first evaporator 120 and the second evaporator 130 are arranged in series. Wherein, when the refrigeration device is in the first refrigeration state, the valve 142 is in an open state, and the second expansion valve 143 is in an open state, at which time the refrigerant will flow in the first evaporator 120 and the second evaporator 130; when the refrigeration device is in the second refrigeration state, the valve 142 is in a closed state, and the first expansion valve 141 is in an open state, at which time the refrigerant only flows in the first evaporator 120. In some embodiments, when the refrigeration device is in the first refrigeration state, the first expansion valve 141 may be in an open state. At this time, the opening of the first expansion valve 141 and the second expansion valve 143 can be controlled according to the storage capacity of the inner tank 110 to adjust the flow rate of the refrigerant flowing in the first evaporator 120 and the second evaporator 130 to adjust the distribution of cooling capacity.

[0050] In some other embodiments, when the refrigeration device is in the first refrigeration state, the first expansion valve 141 may be in a closed state. In this embodiment, when the first expansion valve 141 is closed, the refrigerant passes through the second expansion valve 143, then passes through the second evaporator 130 and the first evaporator 120, and the flow rates in the first evaporator 120 and the second evaporator 130 are the same. In this embodiment, the first evaporator 120 is arranged in the lower half, and the second evaporator 130 is arranged in the upper half. After the refrigeration equipment is powered on and powered on, when the refrigeration equipment needs to start the full-box refrigeration mode (the first refrigeration state), first, the valve 142 is powered on, the first expansion valve 141 is closed, and the second expansion valve 143 is opened. The low-pressure gaseous refrigerant passes through the valve 142, and then after throttling and reducing the pressure of the second expansion valve 143, the refrigerant liquid flows into the second evaporator 130 and the first evaporator 120 to refrigerate the entire box of the refrigeration equipment. The refrigerant absorbs the heat energy in the box to evaporate itself and become superheated steam, and then enters the compressor 160 through the suction pipe to complete a cycle. When the half-box refrigeration mode is started (the second refrigeration state), the valve 142 is first powered off and closed, and the first expansion valve 141 is opened to achieve separate refrigeration of only the lower part of the inner tank 110 of the refrigeration equipment.

[0051] In some other optional embodiments of the present application, such as Figure 4 As shown, the valve group 140 includes a first expansion valve 141, a second expansion valve 143 and a valve 142; the first expansion valve 141 is connected in series with the first evaporator 120 to form a first refrigerant flow path; the second expansion valve 143, the second evaporator 130 and the valve 142 are connected in series to form a second refrigerant flow path; and the first expansion valve 141 is connected in parallel with the second refrigerant flow path; the first evaporator 120 and the second evaporator 130 are arranged in parallel; wherein, when the refrigeration device is in the first refrigeration state, the valve 142 is in an open state, and the The second expansion valve 143 and the first expansion valve 141 are in an open state. At this time, the refrigerant flows to the first evaporator 120 and the second evaporator 130 respectively. The flow of the first evaporator 120 and the second evaporator 130 can be adjusted by adjusting the opening of the first expansion valve 141 and the second expansion valve 143, thereby adjusting the distribution of the cooling capacity; when the refrigeration equipment is in the second refrigeration state, the valve 142 is in a closed state, and the first expansion valve 141 is in an open state. At this time, the first refrigerant only passes through the first evaporator 120 to cool the lower area of ​​the inner tank 110.

[0052] In some other optional embodiments of the present application, such as Figure 5As shown, as an optional implementation of the above embodiment, the valve group 140 includes a first expansion valve 141 and a second expansion valve 143; the first expansion valve 141 is connected in series with the first evaporator 120 to form a first refrigerant flow path; the second expansion valve 143 is connected in series with the second evaporator 130 to form a second refrigerant flow path; the first refrigerant flow path and the second refrigerant flow path are arranged in parallel; when the refrigeration device is in the first refrigeration state, the first expansion valve 141 is in an open state, and the second expansion valve 143 is in an open state, and the flow of the first evaporator 120 and the second evaporator 130 can be adjusted by adjusting the opening of the first expansion valve 141 and the second expansion valve 143, thereby adjusting the distribution of the refrigeration capacity; when the refrigeration device is in the second refrigeration state, the second expansion valve 143 is in a closed state, and the first expansion valve 141 is in an open state. At this time, the first refrigerant only passes through the first evaporator 120 to cool the lower area of ​​the inner tank 110.

[0053] As an optional implementation of the above embodiment, Figure 3 , Figure 4 or Figure 5 As shown, the valve group 140 further includes a one-way valve 144, which is disposed in the second refrigerant flow path and configured to prevent the refrigerant from flowing to the second evaporator 130 when the refrigeration device is in the second refrigeration state. That is, in the technical solution of the embodiment of the present application, when the refrigeration device is operated in the second refrigeration state, the refrigerant will not flow into the second evaporator 130 under the action of the one-way valve 144; and the refrigerant in the second refrigerant flow path can be sucked into the first refrigerant flow path to participate in the circulation of the refrigerant, so that the refrigerant in the refrigeration system is sufficient to participate in the circulation.

[0054] As an optional implementation of the above embodiment, Figure 1 , Figure 3 , Figure 4 and Figure 5As shown, the refrigeration equipment further includes a compressor 160 and a condenser 150; the condenser 150 is connected to the compressor 160. The high-temperature and high-pressure refrigerant compressed by the compressor 160 flows to the condenser 150, and the refrigerant releases heat and reduces pressure in the condenser 150, and forms a low-temperature and low-pressure refrigerant after condensation. The condenser 150 is connected to the first evaporator 120 and the second evaporator 130, and is used to provide the condensed refrigerant to the first evaporator 120 and the second evaporator 130; the low-temperature and low-pressure refrigerant formed after condensation flows to the first evaporator 120 alone or to the first evaporator 120 and the second evaporator 130 under the action of the valve group 140. The first evaporator 120 and the second evaporator 130 are connected to the compressor 160, and the compressor 160 is used to pressurize the refrigerant after heat exchange between the first evaporator 120 and the second evaporator 130. After the refrigerant absorbs heat in the first evaporator 120 and the second evaporator 130, it re-enters the compressor 160 to complete the cycle.

[0055] For example, Figure 3 As shown, in the first cooling state, when the first expansion valve 141 is closed, the refrigerant after passing through the condenser 150 passes through the valve 142, the second expansion valve 143, the second evaporator 130, the check valve 144 and the first evaporator 120 in sequence, and finally flows into the compressor 160, completing a cycle. Figure 3 As shown, in the first refrigeration state, when the first expansion valve 141 is opened, the refrigerant after passing through the condenser 150, the first part of the refrigerant passes through the valve 142, the second expansion valve 143, the second evaporator 130, and the one-way valve 144 in sequence, the second part passes through the first expansion valve 141 and merges with the first part and then flows into the first evaporator 120, and finally flows into the compressor 160, completing a cycle.

[0056] In an embodiment, the refrigeration equipment also includes a drying filter 170, which is arranged between the condenser 150 and the valve group 140, that is, the condensed refrigerant first flows through the drying filter 170, and then flows only to the first evaporator 120, or flows to the first evaporator 120 and the second evaporator 130 through the control of the valve group 140.

[0057] As an optional implementation of the above embodiment, the first evaporator 120 and the second evaporator 130 both include heat exchange tubes, and the heat exchange tubes are wound around the outer surface of the inner liner 110. In the embodiment, the heat exchange tubes are wound around the outer surface of the inner liner 110 to provide cooling to the inner liner 110 by heat transfer.

[0058] Second, as Figure 6As shown, the embodiment of the present application further proposes a control method for a refrigeration device, which is used to control the refrigeration device as described above, and the control method includes:

[0059] S100, obtaining the current storage capacity of the inner tank 110;

[0060] S210, when the current storage capacity is less than a preset capacity, controlling the refrigeration device to operate in the second refrigeration state;

[0061] S220: When the current storage capacity is greater than the preset capacity, control the refrigeration device to operate in the first refrigeration state.

[0062] In an embodiment, the refrigeration state of the refrigeration equipment is controlled by the current storage capacity, so that the cooling capacity provided by the refrigeration equipment can match the required cooling capacity as much as possible, saving energy consumption and ensuring the storage effect of items.

[0063] In the embodiment, the preset capacity is set corresponding to the height at which the first evaporator 120 is set on the inner tank 110. For example, if the height at which the first evaporator 120 is set on the inner tank 110 is half of the height of the inner tank 110, the preset capacity can be set to half of the capacity of the inner tank 110. That is, when the current storage capacity is less than half of the capacity of the inner tank 110, only the first evaporator 120 provides cooling capacity.

[0064] Thirdly, Figure 7 As shown, the embodiment of the present application further provides a control device for a refrigeration device, which is used to control the refrigeration device as described above, and the control device includes:

[0065] An acquisition module 210 is used to acquire the current storage capacity of the inner tank 110;

[0066] A control module 220, configured to control the refrigeration device to operate in the second refrigeration state when the current storage capacity is less than a preset capacity;

[0067] The control module 220 is further configured to control the refrigeration device to operate in the first refrigeration state when the current storage capacity is greater than the preset capacity.

[0068] In an embodiment, the refrigeration state of the refrigeration equipment is controlled by the current storage capacity, so that the cooling capacity provided by the refrigeration equipment can match the required cooling capacity as much as possible, saving energy consumption and ensuring the storage effect of items.

[0069] In the embodiment, the preset capacity is set corresponding to the height at which the first evaporator 120 is set on the inner tank 110. For example, if the height at which the first evaporator 120 is set on the inner tank 110 is half of the height of the inner tank 110, the preset capacity can be set to half of the capacity of the inner tank 110. That is, when the current storage capacity is less than half of the capacity of the inner tank 110, only the first evaporator 120 provides cooling capacity.

[0070] In the technical solution provided in the embodiment of the present application, the refrigeration equipment and control method and control device can meet the storage needs of users, and can also enable the refrigeration equipment to achieve the lowest energy consumption under different usage conditions and user requirements, so that the refrigeration system of the refrigeration equipment can operate efficiently and reliably and the system energy consumption is minimized, thereby reducing the energy consumption of the whole machine, improving the energy efficiency level of the product, and enhancing the market competitiveness of the product. The above is only an optional embodiment of the present application, and does not limit the patent scope of the present application. All equivalent structural changes made under the application concept of the present application using the contents of the specification and drawings of the present application, or directly / indirectly used in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A refrigeration device, characterized in that: include: An inner liner, the inner liner having a storage cavity and an opening disposed at a top of the inner liner; A first evaporator and a second evaporator, wherein the first evaporator and the second evaporator are arranged outside the inner container, and in a vertical direction, the first evaporator is located below the second evaporator; as well as A valve group, the valve group is used to control the flow of refrigerant in the first evaporator and the second evaporator; wherein the refrigeration device has a first refrigeration state and a second refrigeration state; when the refrigeration device is in the first refrigeration state, the valve group controls the refrigerant to flow in the first evaporator and the second evaporator; when the refrigeration device is in the second refrigeration state, the valve group controls the refrigerant to flow only in the first evaporator.

2. The refrigeration device according to claim 1, characterized in that: The valve group includes a first expansion valve, a second expansion valve and a valve; the first expansion valve is connected in series with the first evaporator to form a first refrigerant flow path; the second expansion valve, the second evaporator and the valve are connected in series to form a second refrigerant flow path; and the first expansion valve is connected in parallel with the second refrigerant flow path; the first evaporator and the second evaporator are arranged in series; Wherein, when the refrigeration device is in the first refrigeration state, the valve is in an open state and the second expansion valve is in an open state; when the refrigeration device is in the second refrigeration state, the valve is in a closed state and the first expansion valve is in an open state.

3. The refrigeration device according to claim 2, characterized in that: When the refrigeration device is in the first refrigeration state, the first expansion valve is in a closed state.

4. The refrigeration device according to claim 1, characterized in that: The valve group includes a first expansion valve, a second expansion valve and a valve; the first expansion valve is connected in series with the first evaporator to form a first refrigerant flow path; the second expansion valve, the second evaporator and the valve are connected in series to form a second refrigerant flow path; and the first expansion valve is connected in parallel with the second refrigerant flow path; the first evaporator and the second evaporator are arranged in parallel; Wherein, when the refrigeration device is in the first refrigeration state, the valve is in an open state, and the second expansion valve and the first expansion valve are in an open state; when the refrigeration device is in the second refrigeration state, the valve is in a closed state, and the first expansion valve is in an open state.

5. The refrigeration device according to claim 1, characterized in that: The valve group includes a first expansion valve and a second expansion valve; the first expansion valve is connected in series with the first evaporator to form a first refrigerant flow path; the second expansion valve is connected in series with the second evaporator to form a second refrigerant flow path; the first refrigerant flow path and the second refrigerant flow path are arranged in parallel; When the refrigeration device is in the first refrigeration state, the first expansion valve is in an open state, and the second expansion valve is in an open state; When the refrigeration device is in the second refrigeration state, the second expansion valve is in a closed state, and the first expansion valve is in an open state.

6. The refrigeration device according to any one of claims 2 to 5, characterized in that: The valve group further includes a one-way valve, which is disposed in the second refrigerant flow path and is configured to prevent the refrigerant from flowing to the second evaporator when the refrigeration device is in the second refrigeration state.

7. The refrigeration device according to any one of claims 1 to 5, characterized in that: The refrigeration equipment further comprises a compressor and a condenser; the condenser is connected to the compressor; The condenser is connected to the first evaporator and the second evaporator, and is used to provide condensed refrigerant to the first evaporator and the second evaporator; The first evaporator and the second evaporator are connected to the compressor, and the compressor is used to pressurize the refrigerant after the heat exchange between the first evaporator and the second evaporator.

8. The refrigeration device according to any one of claims 1 to 5, characterized in that: The first evaporator and the second evaporator both include heat exchange tubes, and the heat exchange tubes are wound around the outer surface of the inner tank.

9. A method for controlling a refrigeration device, characterized in that: Used to control the refrigeration equipment according to any one of claims 1 to 8, the control method comprising: Get the current storage capacity in the liner; When the current storage capacity is less than a preset capacity, controlling the refrigeration device to operate in the second refrigeration state; When the current storage capacity is greater than the preset capacity, the refrigeration device is controlled to operate in the first refrigeration state.

10. A control device for a refrigeration device, characterized in that: Used to control the refrigeration equipment according to any one of claims 1 to 8, the control device comprises: An acquisition module is used to obtain the current storage capacity of the inner tank; a control module, configured to control the refrigeration device to operate in the second refrigeration state when the current storage capacity is less than a preset capacity; The control module is further configured to control the refrigeration device to operate in the first refrigeration state when the current storage capacity is greater than the preset capacity.

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