Refrigeration equipment with thermal switching device and control strategy thereof

Abstract

The invention belongs to the technical field of refrigeration, and relates to refrigeration equipment with a thermal switch device and a control strategy of the refrigeration equipment. The refrigeration equipment comprises a box body, an evaporation pipe, a thermal switch device, an electromagnet and the like, the evaporation pipe is attached to and wound on the outer side of at least one container wall; the thermal switch device is arranged on the outer side of the evaporation pipe and comprises a shell and a phase change device. The shell is a sealed shell internally provided with a vacuum cavity, and a heat conduction material is clamped between the shell and the liner wall; the phase change device is connected into the vacuum cavity in a sliding mode and can move in a reciprocating mode in the direction close to or away from the container wall, the phase change device comprises a phase change shell and a phase change material filled in the phase change shell, and a magnet is attached to the side, away from the container wall, of the phase change shell; the electromagnet is positioned on the outer side of the thermal switch device and is opposite to the magnet; the control system is used for regulating and controlling the polarity of the electromagnet so that the electromagnet can generate attraction force or repulsive force on the magnet, and then the phase change device is driven to move in the vacuum cavity. According to the invention, the movable integrated arrangement of the phase change device in the box body is realized, so that cold storage in a valley electricity period and cold release in a peak electricity period can be realized, and thus the cross-period intelligent scheduling of the cooling capacity is realized.

Description

Technical Field

[0001] The invention belongs to the technical field of refrigeration, and in particular relates to a refrigeration device with a thermal switch device and a control strategy thereof. Background Art

[0002] In refrigeration systems, ice blocks are common cold storage devices, which are widely used in refrigerators, freezers and other refrigeration equipment. However, traditional ice blocks have the following limitations:

[0003] 1) Traditional ice blocks can only store cold passively and cannot actively control the storage and release of cold. When the refrigeration equipment is cooling, the ice blocks will passively absorb cold, but it is difficult to effectively release cold when the refrigeration equipment needs it. This passive cold storage method leads to low energy utilization efficiency and is difficult to flexibly adjust according to actual needs.

[0004] 2) Traditional ice packs cannot effectively utilize the peak-valley price difference of the power grid; during the valley period when the electricity price is lower, traditional ice packs cannot actively store cold energy; during the peak period when the electricity price is higher, traditional ice packs cannot actively release cold energy; therefore, users cannot reduce electricity costs and improve economic benefits through intelligent cold storage and release. Summary of the invention

[0005] In view of the deficiencies existing in the related art, the present invention provides a refrigeration device with a thermal switch device and a control strategy thereof to solve the technical problems mentioned in the background technology.

[0006] The present invention provides a refrigeration device with a thermal switch device, comprising:

[0007] The box body includes an inner liner having a plurality of liner walls;

[0008] A refrigeration device is arranged in the box to provide cooling to the inner tank; the refrigeration device includes an evaporation tube, which is arranged in close contact with the outer side of at least one tank wall;

[0009] A thermal switch device is arranged outside the evaporation tube; the thermal switch device comprises a shell and a phase change device; the shell is a sealed shell with a vacuum cavity inside, and a heat conductive material is sandwiched between the shell and the gallbladder wall; the phase change device is slidably connected in the vacuum cavity and can reciprocate in a direction close to or away from the gallbladder wall, the phase change device comprises a phase change shell, a phase change material filled in the phase change shell, and a magnet is attached to the inner wall of the phase change shell on the side away from the gallbladder wall;

[0010] The electromagnetic drive mechanism comprises an electromagnet, which is located on the outer side of the thermal switch device away from the gallbladder wall and is arranged opposite to the magnet;

[0011] A control system is electrically connected to the electromagnetic drive mechanism; the control system is used to adjust the polarity of the electromagnet so that the electromagnet generates an attractive force or a repulsive force on the magnet, thereby driving the phase change device to move in the vacuum chamber in a direction away from or close to the gallbladder wall.

[0012] In some of the embodiments, the phase change material in the phase change device is a magnesium chloride solution with a mass fraction of 17%; and the phase change temperature of the phase change material is lower than the preset box temperature of the refrigeration equipment.

[0013] In some embodiments, the thermally conductive material is thermally conductive silicone or thermally conductive gel.

[0014] In some embodiments, a heat insulating sleeve is sandwiched between the evaporating tube and the heat conducting material.

[0015] In some embodiments, the distance m between the cavity wall of the vacuum cavity close to the gallbladder wall and the cavity wall away from the gallbladder wall is greater than the distance D between the outer wall of the phase change shell close to the gallbladder wall and the outer wall away from the gallbladder wall, and L=D+10mm.

[0016] In some of the embodiments, the thermal switch device also includes guide components respectively arranged on the upper and lower sides of the phase change device, each guide component includes a guide rail and a roller that can move back and forth along the guide rail; the guide rail is arranged on the top surface or bottom surface of the vacuum chamber of the outer shell, and the roller is connected to the upper and lower sides of the phase change shell.

[0017] The present invention also provides a control strategy for a refrigeration device with a thermal switch device, which is based on the aforementioned refrigeration device with a thermal switch device and includes the following steps:

[0018] S1. Inputting preset power period information into the control system, the preset power period information includes peak power period, valley power period and flat power period;

[0019] S2, the refrigeration equipment is running, and the control system detects the current power period;

[0020] If the current period is valley electricity, the control system adjusts the polarity of the electromagnet to make the phase change device fit with the vacuum chamber wall close to the gallbladder wall, and the phase change material in the phase change device absorbs the cold in the box through the heat conductive material to store cold; the control system detects the cold capacity in the phase change device, and when the cold storage is full, the control system reverses the polarity of the electromagnet to move the phase change device away from the gallbladder wall, so that a vacuum insulation layer is formed between the phase change device and the vacuum chamber wall close to the gallbladder wall;

[0021] If it is currently in the peak power period, the control system adjusts the polarity of the electromagnet to make the phase change device fit with the vacuum chamber wall close to the gallbladder wall, and the phase change material in the phase change device releases cold energy into the box through the heat conductive material; the control system detects the cold energy in the phase change device, and when the cold energy is insufficient, the control system reverses the polarity of the electromagnet to make the phase change device move away from the gallbladder wall, so that a vacuum heat insulation layer is formed between the phase change device and the vacuum chamber wall close to the gallbladder wall;

[0022] If the current state is in the flat power period, the control system adjusts the polarity of the electromagnet so that the phase change device does not fit the vacuum chamber wall close to the gallbladder wall, and a vacuum insulation layer is formed between the phase change device and the vacuum chamber wall close to the gallbladder wall.

[0023] In some of the embodiments, when the control system detects that the current period is off-peak and the phase change device is storing cold, the control system also monitors whether goods are added in the box. If goods are added in the box, the control system reverses the polarity of the electromagnet to move the phase change device away from the gallbladder wall, forming a vacuum insulation layer between the phase change device and the vacuum chamber wall close to the gallbladder wall.

[0024] In some of the embodiments, a temperature sensor for measuring the real-time temperature of the phase change material is provided in the phase change device; the control system is connected to the temperature sensor to detect the cooling condition in the phase change device.

[0025] Based on the above technical scheme, the refrigeration equipment with a thermal switch device and its control strategy in the embodiment of the present invention realizes the movable integrated setting of the phase change device in the box, and stores cold during the valley electricity period and releases cold during the peak electricity period, thereby realizing cross-time intelligent scheduling of cooling capacity, making full use of the peak-valley electricity price difference to reduce the electricity cost of the refrigeration equipment, and solving the problem that traditional ice blocks cannot actively control the storage and release of cold capacity and cannot effectively utilize the peak-valley electricity price difference of the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0027] Figure 1 It is a partial schematic diagram of a refrigeration device with a thermal switch device of the present invention;

[0028] Figure 2 It is a schematic diagram of the state of the phase change device in the refrigeration equipment with the thermal switch device of the present invention when storing or releasing cold;

[0029] Figure 3 It is a schematic diagram of a state when a vacuum insulation layer is formed between a phase change device and a vacuum cavity of a shell in a refrigeration device having a thermal switch device of the present invention;

[0030] Figure 4 The figure is a flow chart of the control strategy of the refrigeration equipment with the thermal switch device of the present invention.

[0031] In the figure: 1. box body; 2. tank wall; 3. foaming layer; 4. evaporating tube; 5. thermal switch device; 51. outer shell; 52. phase change device; 521. phase change shell; 522. phase change material; 523. magnet; 6. thermal conductive material; 7. electromagnet; 8. roller; 9. vacuum insulation layer. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0033] In the description of the present invention, it is to be understood that the terms "center", "lateral", "longitudinal", "up", "down", "top", "bottom", "inside", "outside", "left", "right", "front", "back", "vertical", "horizontal", etc., indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, that is, the directions are expressed when the user faces the refrigeration equipment, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation to the present invention.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] refer to Figure 1-Figure 4 As shown, the present invention provides a refrigeration device with a thermal switch device, which includes a box body 1, a refrigeration device, a thermal switch device 5, an electromagnetic drive mechanism and a control system.

[0036] The box body 1 includes a box shell and an inner liner, and the inner liner has a plurality of liner walls 2; a foaming layer 3 is provided between the liner wall 2 and the box shell; the space formed by the inner liner is the inner space of the box body 1 for storing goods. The refrigeration device is arranged in the box body 1 to provide cooling to the inner liner, that is, to provide cooling to the inner space of the box for storing goods; it can be understood that the refrigeration device usually includes a compressor, a condenser, a throttling device and an evaporator, etc., to form a refrigeration circuit; a refrigerant circulates in the refrigeration circuit. The evaporator includes an evaporation tube 4, which is arranged in close contact with the outer side of at least one liner wall 2.

[0037] The thermal switch device 5 is arranged on the outside of the evaporation tube 4, that is, the thermal switch device 5 is located in the foaming layer 3 and close to the evaporation tube 4. The thermal switch device 5 includes an outer shell 51 and a phase change device 52. The outer shell 51 is a sealed shell with a vacuum cavity inside. A heat-conducting material 6 is sandwiched between the outer shell 51 and the inner gallbladder wall 2, so that the outer shell 51 and the inner gallbladder wall 2 are connected and heat is transferred through the heat-conducting material 6; it can be understood that the evaporation tube 4 at the thermal switch device 5 is wrapped in the heat-conducting material 6 between the outer shell 51 and the inner gallbladder wall 2. The phase change device 52 is slidably connected to the vacuum cavity of the outer shell 51, and the phase change device 52 can reciprocate in the direction of approaching or moving away from the gallbladder wall 2, that is, the distance L between the cavity wall of the vacuum cavity of the outer shell 51 close to the gallbladder wall 2 and the cavity wall away from the gallbladder wall 2 is greater than the distance D between the outer wall of the phase change device 52 close to the gallbladder wall 2 and the outer wall away from the gallbladder wall 2. The phase change device 52 includes a phase change shell 521 and a phase change material 522 filled in the phase change shell 521; the phase change material 522 can store and release energy through physical state changes; a magnet 523 is attached to the inner wall of the phase change shell 521 away from the gallbladder wall 2, and the magnet 523 has magnetic poles.

[0038] The electromagnetic drive mechanism includes an electromagnet 7, which is located on the outer side of the thermal switch device 5 away from the gallbladder wall 2 and is arranged opposite to the magnet 523; that is, the electromagnet 523 is located in the foaming layer 3 between the thermal switch device 5 and the box shell. After the electromagnet 7 is energized, it can generate polarity, which can generate an attractive force or a repulsive force on the magnet 523 in the phase change device 52, and then drive the magnet 523 and the phase change device 52 to move, providing a driving force for the movement of the phase change device 52, and avoiding the wear and power performance degradation caused by the use of a traditional mechanical drive mechanism.

[0039] The control system is electrically connected to the electromagnetic drive mechanism. The control system is used to adjust the polarity of the electromagnet 7 so that the electromagnet 7 generates an attractive force or a repulsive force on the magnet 523 in the phase change device 52; when the electromagnet 7 generates an attractive force on the magnet 523, the magnet 523 moves toward the electromagnet 7, thereby driving the phase change device 52 to move away from the bile wall 2 in the vacuum chamber of the shell 51; when the electromagnet 7 generates a repulsive force on the magnet 523, the magnet 523 moves away from the electromagnet 7, thereby driving the phase change device 52 to move toward the bile wall 2 in the vacuum chamber of the shell 51.

[0040] To further illustrate, when the refrigeration equipment is working, the refrigeration device supplies cold to the inner tank, and the cold in the box is dissipated outward through the inner tank wall 2. When the phase change device 52 is attached to the cavity wall of the vacuum cavity of the outer shell 51 close to the tank wall 2, if the temperature in the box is low, the phase change material 522 in the phase change device 52 absorbs the cold in the box and stores it through the phase change shell 521, the outer shell 51, the heat conductive material 6 and the inner tank wall 2 to realize the cold storage function; if the temperature in the box is high, the cold stored in the phase change material 522 is released into the box through the phase change shell 521, the outer shell 51, the heat conductive material 6 and the inner tank wall 2 to realize the cooling function. When the phase change device 52 leaves the cavity wall of the vacuum cavity of the outer shell 51 close to the gallbladder wall 2, a vacuum insulation layer 9 will be formed between the phase change device 52 and the cavity wall of the vacuum cavity of the outer shell 51 close to the gallbladder wall 2; the vacuum insulation layer 9 can greatly reduce the transfer of heat, thereby avoiding the loss of cold in the box, improving the thermal insulation performance between the phase change device 52 and the inner gallbladder wall 2, and achieving a heat insulation effect.

[0041] The above-mentioned schematic embodiment realizes the integrated setting of the phase change device 52 in the box body 1 and enables the phase change device 52 to move back and forth relative to the inner tank wall 2, thereby realizing the functions of cold storage, cold release and vacuum insulation, so that the refrigeration equipment has the ability to dispatch cold capacity; on this basis, the control system can control the position of the phase change device 52 by adjusting the polarity of the electromagnet 7 according to actual conditions such as power period or user demand, thereby realizing the on-demand dispatch of cold capacity, thereby achieving the purpose of energy saving and consumption reduction.

[0042] In some embodiments, the phase change material 522 in the phase change device 52 is a magnesium chloride solution with a mass fraction of 17%; the phase change temperature of the phase change material 522 is lower than the preset box temperature of the refrigeration equipment; the phase change material 522 is a phase change material with high latent heat and low phase change point; when the phase change material 522 stores cold, it absorbs and effectively stores cold energy during the phase change process from liquid to solid; when the phase change material 522 releases cold, it can release a large amount of cold energy during the phase change process from solid to liquid; thereby, the cold storage and release functions of the phase change device 52 are realized, and the cold utilization efficiency is optimized.

[0043] refer to Figure 1 As shown, in some embodiments, the thermally conductive material 6 is thermally conductive silicone or thermally conductive gel; the thermally conductive material 6 is a flexible and highly thermally conductive material 6, which, on the one hand, enables the outer shell 51 of the thermal switch device 5 to be tightly combined with the inner tank wall 2, and on the other hand, effectively improves the heat transfer efficiency between the outer shell 51 and the tank wall 2.

[0044] refer to Figure 1 As shown, in some embodiments, an insulating sleeve (not shown) is sandwiched between the evaporator tube 4 and the heat-conducting material 6 to prevent the cold in the evaporator tube 4 from being conducted to the heat-conducting material 6 and interfering with the cold transfer during normal cooling of the refrigeration equipment, thereby ensuring stable operation of the refrigeration equipment.

[0045] refer to Figure 1 , Figure 3 As shown, in some embodiments, the distance L between the cavity wall of the vacuum cavity of the outer shell 51 close to the gallbladder wall 2 and the cavity wall on the side away from the gallbladder wall 2 is greater than the distance D between the outer wall of the phase change shell 521 close to the gallbladder wall 2 and the outer wall on the side away from the gallbladder wall 2, and L=D+10mm; therefore, when the phase change device 52 moves away from the gallbladder wall 2, the maximum thickness of the vacuum insulation layer 9 that can be formed is 10mm; after analysis, the setting of the vacuum insulation layer 9 can significantly improve the insulation effect, and the insulation effect brought about can be up to 18 times that of the absence of a vacuum layer; it should be noted that in actual applications, the specific thickness of the vacuum insulation layer 9 can be controlled by turning the electromagnet 7 on and off, thereby adjusting the position of the phase change device 52 in the vacuum cavity of the outer shell 51, and then adjusting the insulation effect of the vacuum insulation layer 9.

[0046] refer to Figure 2 , Figure 3 As shown, in some embodiments, the thermal switch device 5 further includes guide components respectively arranged on the outer sides of the upper and lower sides of the phase change device 52, and each guide component includes a guide rail (not shown) and a roller 8. The guide rail is arranged on the top surface or bottom surface of the vacuum chamber of the shell 51, and the extension direction of the guide rail is perpendicular to the inner gallbladder wall 2; the roller 8 is connected to the outer sides of the upper and lower sides of the phase change shell 521, and the roller 8 is adapted to the guide rail so that the roller 8 can reciprocate along the guide rail, thereby driving the phase change device 52 to move in a direction close to or away from the gallbladder wall 2. This illustrative embodiment can reduce the friction resistance of the phase change device 52 when it moves through the matching arrangement of the guide rail and the roller 8, thereby reducing the specifications and energy consumption of the electromagnet 7 providing the driving force, and realizing the smooth and smooth movement of the phase change device 52 in the vacuum chamber of the shell 51.

[0047] refer to Figure 1-Figure 4 As shown, the present invention also provides a control strategy for a refrigeration device with a thermal switch device, which is based on the aforementioned refrigeration device with a thermal switch device and includes the following steps:

[0048] S1. Input preset power period information into the control system. The preset power period information includes peak power period, valley power period and normal power period.

[0049] S2. The refrigeration equipment is running, and the control system detects the current power period.

[0050] If the control system detects that it is currently in the valley electricity period, the control system adjusts the polarity of the electromagnet 7 to make it produce a repulsive force on the magnet 523 in the phase change device 52, and the magnet 523 will drive the phase change device 52 to move in the direction close to the gallbladder wall 2, so that the phase change device 52 fits with the vacuum chamber wall of the shell 51 close to the gallbladder wall 2, and the phase change material 522 in the phase change device 52 absorbs the cold in the box through the heat conductive material 6 to store cold; since the electricity price is low during the valley electricity period, it provides an excellent economic opportunity for the phase change device 52 to store cold. The control system detects the cold in the phase change device 52. When the cold storage is full, the control system reverses the polarity of the electromagnet 7 to make it produce an attractive force on the magnet 523 in the phase change device 52, and the magnet 523 will drive the phase change device 52 to move away from the gallbladder wall 2, so that a vacuum insulation layer 9 is formed between the phase change device 52 and the vacuum chamber wall of the shell 51 close to the gallbladder wall 2, to avoid the ineffective release of cold in the box.

[0051] If the control system detects that it is currently in the peak power period, the control system adjusts the polarity of the electromagnet 7 so that it generates a repulsive force on the magnet 523 in the phase change device 52, and the magnet 523 will drive the phase change device 52 to move in the direction close to the gallbladder wall 2, so that the phase change device 52 fits the vacuum chamber wall of the shell 51 close to the gallbladder wall 2, and the phase change material 522 in the phase change device 52 releases cold energy into the box through the heat conductive material 6; due to the high electricity price during the peak power period, the phase change device 52 releases cold energy at this time, which is conducive to maintaining the low temperature state in the box, reducing the power consumption during the peak power period, and thus reducing the operating cost of the refrigeration equipment. The control system detects the cold energy in the phase change device 52. When the cold energy is insufficient, that is, the cold energy is exhausted, the control system reverses the polarity of the electromagnet 7 so that it generates an attractive force on the magnet 523 in the phase change device 52, and the magnet 523 will drive the phase change device 52 to move in the direction away from the gallbladder wall 2, so that a vacuum insulation layer 9 is formed between the phase change device 52 and the vacuum chamber wall of the shell 51 close to the gallbladder wall 2, thereby preventing the loss of cold energy in the box.

[0052] If the control system detects that it is currently in the flat power period, the control system adjusts the polarity of the electromagnet 7 so that the phase change device 52 does not fit into the vacuum chamber wall of the outer shell 51 on the side close to the gallbladder wall 2, and a vacuum insulation layer 9 is formed between the phase change device 52 and the vacuum chamber wall of the outer shell 51 on the side close to the gallbladder wall 2 to prevent the loss of cold air in the box.

[0053] The above-mentioned illustrative embodiment refines the control strategy of the refrigeration equipment during the valley power period, the peak power period and the flat power period, and drives the phase change device 52 to move by adjusting the polarity of the electromagnet 7, so as to realize cold storage during the valley power period, cold release during the peak power period, and form vacuum insulation when not storing or releasing cold, thereby realizing cross-time intelligent scheduling of cold capacity, avoiding ineffective release or loss of cold capacity in the box, greatly improving the utilization efficiency of cold capacity, and making full use of the peak-valley electricity price difference to reduce the electricity cost of the refrigeration equipment, thereby solving the problem that traditional ice blocks cannot actively control the storage and release of cold capacity and cannot effectively utilize the peak-valley electricity price difference of the power grid.

[0054] In some embodiments, when the control system detects that it is currently in a valley electricity period and the phase change device 52 is storing cold, the control system also monitors whether goods are added in the box. If goods are added in the box, the control system reverses the polarity of the electromagnet 7 to cause it to generate an attraction for the magnet 523 in the phase change device 52. The magnet 523 will drive the phase change device 52 to move away from the gallbladder wall 2, so that a vacuum insulation layer 9 is formed between the phase change device 52 and the vacuum chamber wall of the outer shell 51 on the side close to the gallbladder wall 2, thereby preventing the phase change material 522 from storing cold and robbing the refrigeration equipment of its cooling capacity, thereby ensuring that the newly added goods can be quickly cooled.

[0055] In some embodiments, a temperature sensor (not shown) for measuring the real-time temperature of the phase change material 522 is provided in the phase change device 52; the control system is electrically or communicatively connected to the temperature sensor, and by reading the real-time temperature of the phase change material 522, it is determined whether the phase change device 52 has reached a state of full cold storage or insufficient cold storage, thereby realizing the detection of the cold storage situation in the phase change device 52.

[0056] In summary, the refrigeration equipment with a thermal switch device and its control strategy of the present invention, through the settings of the thermal switch device 5, the electromagnetic drive mechanism, and the guide component, realizes the integrated setting of the phase change device 52 in the box body 1 and enables the phase change device 52 to reciprocate relative to the inner tank wall 2; by adjusting the polarity of the electromagnet 7 to drive the phase change device 52 to move, it is realized to store cold during the valley power period, release cold during the peak power period, and form vacuum insulation when not storing cold or releasing cold, thereby realizing cross-time intelligent scheduling of cold capacity, making full use of the peak-valley electricity price difference to reduce the electricity cost of the refrigeration equipment, improve energy utilization, and improve economic benefits.

[0057] Finally, it should be noted that: the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0058] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A refrigeration device having a thermal switch device, characterized in that: include: The box body comprises an inner liner, wherein the inner liner has a plurality of liner walls; A refrigeration device is arranged in the box to provide cooling to the inner tank; the refrigeration device comprises an evaporation tube, and the evaporation tube is arranged in close contact with the outer side of at least one tank wall; A thermal switch device is arranged outside the evaporation tube; the thermal switch device comprises a shell and a phase change device; the shell is a sealed shell with a vacuum chamber inside, and a heat-conducting material is sandwiched between the shell and the gallbladder wall; the phase change device is slidably connected in the vacuum chamber and can reciprocate in a direction close to or away from the gallbladder wall, the phase change device comprises a phase change shell, a phase change material filled in the phase change shell, and a magnet is attached to the inner wall of the phase change shell on the side away from the gallbladder wall; An electromagnetic drive mechanism, comprising an electromagnet, the electromagnet being located on the outer side of the thermal switch device away from the gallbladder wall and arranged opposite to the magnet; A control system is electrically connected to the electromagnetic drive mechanism; the control system is used to adjust the polarity of the electromagnet so that the electromagnet generates an attractive force or a repulsive force on the magnet, thereby driving the phase change device to move in the vacuum chamber in a direction away from or close to the gallbladder wall.

2. The refrigeration device with a thermal switch device according to claim 1, characterized in that: The phase change material in the phase change device is a magnesium chloride solution with a mass fraction of 17%; the phase change temperature of the phase change material is lower than the preset box temperature of the refrigeration equipment.

3. The refrigeration device with a thermal switch device according to claim 1, characterized in that: The heat-conducting material is heat-conducting silica gel or heat-conducting gel.

4. The refrigeration device with a thermal switch device according to claim 1 or 3, characterized in that: A heat insulating sleeve is sandwiched between the evaporating tube and the heat conducting material.

5. The refrigeration device with a thermal switch device according to claim 1, characterized in that: The distance L between the cavity wall of the vacuum cavity close to the gallbladder wall and the cavity wall away from the gallbladder wall is greater than the distance D between the outer wall of the phase change shell close to the gallbladder wall and the outer wall away from the gallbladder wall, and L=D+10mm.

6. The refrigeration device with a thermal switch device according to claim 1, characterized in that: The thermal switch device also includes guide components respectively arranged on the outside of the upper and lower sides of the phase change device, each of the guide components includes a guide rail and a roller that can reciprocate along the guide rail; the guide rail is arranged on the top surface or bottom surface of the outer shell vacuum chamber, and the roller is connected to the outside of the upper and lower sides of the phase change shell.

7. A control strategy for a refrigeration device having a thermal switch device, characterized in that: Based on the refrigeration equipment with a thermal switch device according to any one of claims 1 to 6, the method comprises the following steps: S1. Inputting preset power period information into the control system, wherein the preset power period information includes peak power period, valley power period and normal power period; S2, the refrigeration equipment is running, and the control system detects the current power period; If the current is in the valley electricity period, the control system adjusts the polarity of the electromagnet to make the phase change device fit with the vacuum chamber wall close to the gallbladder wall, and the phase change material in the phase change device absorbs the cold in the box through the heat conductive material to store cold; the control system detects the cold capacity in the phase change device, and when the cold storage is full, the control system reverses the polarity of the electromagnet to make the phase change device move away from the gallbladder wall, and a vacuum insulation layer is formed between the phase change device and the vacuum chamber wall close to the gallbladder wall; If the current power consumption is at a peak period, the control system adjusts the polarity of the electromagnet to make the phase change device fit with the vacuum chamber wall close to the gallbladder wall, and the phase change material in the phase change device releases cold energy into the box through the heat conductive material; the control system detects the cold energy in the phase change device, and when the cold energy is insufficient, the control system reverses the polarity of the electromagnet to make the phase change device move away from the gallbladder wall, so that a vacuum heat insulation layer is formed between the phase change device and the vacuum chamber wall close to the gallbladder wall; If the current state is flat, the control system adjusts the polarity of the electromagnet so that the phase change device does not fit the vacuum chamber wall close to the gallbladder wall, and a vacuum insulation layer is formed between the phase change device and the vacuum chamber wall close to the gallbladder wall.

8. The control strategy of the refrigeration equipment with a thermal switch device according to claim 7, characterized in that: When the control system detects that it is currently in the off-peak period and the phase change device is storing cold, the control system also monitors whether goods are added in the box. If goods are added in the box, the control system reverses the polarity of the electromagnet to move the phase change device away from the gallbladder wall, and a vacuum insulation layer is formed between the phase change device and the vacuum chamber wall on the side close to the gallbladder wall.

9. The control strategy of the refrigeration equipment with a thermal switch device according to claim 7, characterized in that: The phase change device is provided with a temperature sensor for measuring the real-time temperature of the phase change material; the control system is connected to the temperature sensor to detect the cooling capacity in the phase change device.

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