Refrigeration equipment door opening system and refrigeration equipment

By using an electromagnetic coil assembly in the refrigeration equipment, the door is opened by utilizing the principle of repulsion between like magnetic poles, thus solving the problem of loud door opening noise in the refrigeration equipment, achieving quiet door opening, improving user experience and equipment lifespan.

CN223869623UActive Publication Date: 2026-02-03TCL HOME APPLIANCES (HEFEI) CO LTD
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Patent Information

Application Number
CN202520084903.6
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-01-14
Publication Date
2026-02-03
Estimated Expiration
2035-01-14

AI Technical Summary

Technical Problem

The door opening mechanism of existing refrigeration equipment is noisy, which affects the user experience.

Method used

Using an electromagnetic coil assembly, the door is opened by leveraging the principle of repulsion between like magnetic poles. This repulsive force generated by the electromagnetic coil assembly pushes the door open, achieving contactless door opening.

Benefits of technology

It reduces noise during the door opening process, improves the user experience, and extends the service life of the mechanical structure.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the technical field of household appliances, and provides a refrigeration equipment door opening system and refrigeration equipment, the refrigeration equipment door opening system comprises a box body, a door body and a power supply device, the box body is provided with a first electromagnetic coil assembly, the door body is rotatably arranged on the box body, and the door body is provided with a second electromagnetic coil assembly; the second electromagnetic coil assembly is arranged corresponding to the first electromagnetic coil assembly, the power supply device is used for supplying power to the first electromagnetic coil assembly and the second electromagnetic coil assembly when the door body needs to be opened, and the magnetic poles of the sides, close to each other, of the first electromagnetic coil assembly and the second electromagnetic coil assembly are the same. According to the principle that magnetic poles of the same polarity repel each other, repulsive force generated by the electromagnetic coil assembly can push the door body to be opened to open the door, a non-contact door opening mode is achieved, noise possibly generated in the door opening process of a traditional push rod or sliding block mechanism is avoided, and the use experience of a user is improved.
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Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of household appliances, and particularly relates to a refrigeration equipment door opening system and a refrigeration equipment. BACKGROUND

[0002] In related technologies, the door opening mechanism of a refrigeration equipment such as a refrigerator usually comprises a push rod or a sliding block, and the automatic opening of the door is realized by the push rod or the sliding block contacting the door body. The opening process is noisy, which affects the user experience. CONTENT OF THE UTILITY MODEL

[0003] The refrigeration equipment door opening system and the refrigeration equipment provided by the embodiments of the application solve the problem of large noise during the opening of the existing refrigeration equipment.

[0004] In a first aspect, the embodiments of the application provide a refrigeration equipment door opening system, comprising:

[0005] a cabinet body, wherein a first electromagnetic coil assembly is installed on the cabinet body;

[0006] a door body, which is rotationally arranged on the cabinet body, wherein a second electromagnetic coil assembly is installed on the door body, and the second electromagnetic coil assembly is arranged correspondingly to the first electromagnetic coil assembly;

[0007] a power supply device, which is configured to supply power to the first electromagnetic coil assembly and the second electromagnetic coil assembly when the door body needs to be opened, and the magnetic poles on the side where the first electromagnetic coil assembly and the second electromagnetic coil assembly are close to each other are the same.

[0008] In some embodiments of the application, the number of the first electromagnetic coil assemblies and the number of the second electromagnetic coil assemblies are both multiple, and the first electromagnetic coil assemblies and the second electromagnetic coil assemblies are arranged one by one.

[0009] In some embodiments of the application, the rotation side of the door body is rotationally connected to the cabinet body, and the second electromagnetic coil assembly is installed on the side of the door body away from the rotation side.

[0010] In some embodiments of the application, the refrigeration equipment door opening system further comprises:

[0011] a first mounting box, which is installed on the cabinet body, and the first electromagnetic coil assembly is installed in the first mounting box;

[0012] a second mounting box, which is installed on the door body, and the second electromagnetic coil assembly is installed in the second mounting box.

[0013] In some embodiments of the application, the first mounting box is provided with a first limiting piece on each of the opposite sides, and the first limiting piece is configured to fix the first coil of the first electromagnetic coil assembly.

[0014] And / or, the second installation box is provided with a second limiting piece on the opposite side, and the second limiting piece is used for fixing the second coil of the second electromagnetic coil assembly.

[0015] In some embodiments of the present application, the first installation box and the second installation box are respectively installed outside the cabinet and the door body.

[0016] Or, the first installation box is embedded in the cabinet, and the second installation box is embedded in the door body.

[0017] In some embodiments of the present application, the first electromagnetic coil assembly includes a first core and a first coil wound on the first core, and the second electromagnetic coil assembly includes a second core and a second coil wound on the second core; during the opening of the door body, the magnetic poles of the first core and the second core on the side close to each other are the same.

[0018] In some embodiments of the present application, the axis of the first core is on the same line as the axis of the second core.

[0019] In some embodiments of the present application, the refrigeration equipment door opening system further comprises:

[0020] A controller is arranged in the cabinet, and the controller is configured to control the power supply device to supply power to the first electromagnetic coil assembly and the second electromagnetic coil assembly when receiving an opening signal.

[0021] An opening trigger is used to send the opening signal to the controller.

[0022] In a second aspect, the embodiments of the present application also provide a refrigeration equipment, which comprises the refrigeration equipment door opening system described in the above embodiments.

[0023] The refrigeration equipment door opening system provided by the embodiments of the present application comprises a cabinet, a door body and a power supply device. The cabinet is provided with a first electromagnetic coil assembly. The door body is rotatably arranged on the cabinet. The door body is provided with a second electromagnetic coil assembly. The second electromagnetic coil assembly is arranged corresponding to the first electromagnetic coil assembly. The power supply device is used to supply power to the first electromagnetic coil assembly and the second electromagnetic coil assembly when the door body needs to be opened. The magnetic poles on the side close to each other of the first electromagnetic coil assembly and the second electromagnetic coil assembly are the same. According to the principle that the same magnetic poles repel each other, the repulsive force generated between the first electromagnetic coil assembly and the second electromagnetic coil assembly can push the door body to open and perform the opening, so that a non-contact opening mode is realized. The noise generated by the traditional push rod or sliding block mechanism during the opening process is avoided, and the user experience is improved.

[0024] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings. In the following description, the same reference numerals denote the same parts.

[0027] Figure 1 A schematic diagram of the structure of the refrigeration equipment door opening system provided in the embodiments of this application. Figure 1 .

[0028] Figure 2 A schematic diagram of the circuit connection of the door opening system of the refrigeration equipment provided in the embodiments of this application.

[0029] Figure 3 This is a schematic diagram of the installation of the first electromagnetic coil assembly provided in an embodiment of this application.

[0030] Figure 4 This is a schematic diagram of the installation of the second electromagnetic coil assembly provided in an embodiment of this application.

[0031] Figure 5 A schematic diagram of the structure of the refrigeration equipment door opening system provided in the embodiments of this application. Figure 2 .

[0032] Figure label:

[0033] 100. Housing; 110. First electromagnetic coil assembly; 111. First coil; 112. First iron core; 120. First mounting box; 121. First limiting component;

[0034] 200. Door body; 210. Second electromagnetic coil assembly; 211. Second coil; 212. Second iron core; 201. Rotating side; 220. Second mounting box; 221. Second limiting component;

[0035] 300. Power supply equipment;

[0036] 400. Controller. Detailed Implementation

[0037] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this application, but should not be used to limit the scope of this application.

[0038] In the description of the embodiments of this application, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0040] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0041] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0042] In related technologies, the door opening mechanism of refrigeration equipment such as refrigerators usually includes a non-concealed push mechanism such as a push rod or slider. The door opens automatically by contacting the door body through the push mechanism. However, the noise during the opening process is relatively loud, which affects the user experience.

[0043] This application provides a door opening system and a refrigeration device to solve the problem of excessive noise generated when opening the door of existing refrigeration devices. The following will be described in conjunction with the accompanying drawings. Figures 1-5 Please provide an explanation.

[0044] The refrigeration equipment door opening system provided in this application embodiment is referenced. Figure 1 and Figure 2 As shown, the device includes a housing 100, a door 200, and a power supply device 300. The housing 100 is equipped with a first electromagnetic coil assembly 110. The door 200 is rotatably mounted on the housing 100 and is equipped with a second electromagnetic coil assembly 210. The second electromagnetic coil assembly 210 is arranged corresponding to the first electromagnetic coil assembly 110. The power supply device 300 is used to supply power to the first electromagnetic coil assembly 110 and the second electromagnetic coil assembly 210 when the door 200 needs to be opened. The magnetic poles of the first electromagnetic coil assembly 110 and the second electromagnetic coil assembly 210 are the same on the side that is close to each other.

[0045] It is understood that in this embodiment, the electromagnetic coil assembly may include a coil and a magnetic material, and a magnetic field is generated around the coil when current flows through it. The polarity of the magnetic field can be controlled by controlling the direction of the current.

[0046] Based on the principle of magnetic repulsion between like poles and attraction between unlike poles, the first electromagnetic coil assembly 110 and the second electromagnetic coil assembly 210 are powered when the door 200 is opened. This causes the magnetic poles on the sides of the first electromagnetic coil assembly 110 and the second electromagnetic coil assembly 210 that are close to each other to be the same, thereby generating a repulsive force. When the repulsive force is large enough, it can push the door 200 to rotate, thus opening the door. Since no mechanical parts directly contact the door 200 during the opening process, no noise caused by friction or impact is generated, resulting in a quieter opening sound and providing users with a smoother and quieter door opening experience. Furthermore, it reduces wear on the housing 100 or the door 200 caused by mechanical contact, improving the system's service life.

[0047] For example, the power supply device 300 may include two power supplies, which are respectively located in the housing 100 and the door 200, and respectively supply power to the first electromagnetic coil assembly 110 and the second electromagnetic coil assembly. The power supply on the door 200 can be routed through the door hinge to the inside of the door 200 to reduce damage to the wiring during the opening and closing of the door; the wiring of the power supply on the housing 100 can be routed through the outer shell of the housing 100.

[0048] In one optional embodiment, there are multiple first electromagnetic coil assemblies 110 and second electromagnetic coil assemblies 210, and the first electromagnetic coil assemblies 110 and the second electromagnetic coil assemblies 210 are arranged in a one-to-one correspondence.

[0049] For example, by assembling multiple electromagnetic coil assemblies on the door 200 and the housing 100, the force generated when opening the door can be more evenly distributed across the door 200. Each first electromagnetic coil assembly 110 needs to precisely correspond to a second electromagnetic coil assembly 210 on the door 200 to ensure that the magnetic lines of force they generate are correctly aligned and produce a repulsive force. Multiple electromagnetic coil assemblies can generate a larger total repulsive force, ensuring that the door 200 can be opened smoothly. When one electromagnetic coil assembly fails, the others can still operate, ensuring that the basic functions of the door opening system are not affected and improving system reliability.

[0050] Optionally, multiple electromagnetic coil assemblies can be controlled independently or uniformly.

[0051] In one alternative implementation, refer to Figure 1 As shown, the rotating side 201 of the door 200 is rotatably connected to the housing 100, and the second electromagnetic coil assembly 210 is installed on the side of the door 200 away from the rotating side 201.

[0052] In this embodiment, the rotating side 201 of the door 200 refers to the side of the door 200 that is hinged to the housing 100. Since the second electromagnetic coil assembly 210 is installed on the door 200 away from the rotating side 201, the repulsive force they generate can form a large torque. Only a small repulsive force is needed to open the door 200, reducing energy consumption. Moreover, the large torque helps the door 200 to open smoothly, reducing shaking and instability when opening the door.

[0053] For example, combined Figure 1 and Figure 2 As shown, the first electromagnetic coil assembly 110 includes a first iron core 112 and a first coil 111 wound around the first iron core 112, and the second electromagnetic coil assembly 210 includes a second iron core 212 and a second coil 211 wound around the second iron core 212; during the opening of the door 200, the magnetic poles of the first iron core 112 and the second iron core 212 on the side that are close to each other are the same.

[0054] The power supply device 300 can supply power to the first coil 111 and the second coil 211, thereby generating a magnetic field around the first iron core 112 and the second iron core 212. Since the magnetic poles of the magnetic fields on the sides of the first iron core 112 and the second iron core 212 that are close to each other are the same, according to the principle that like magnetic poles repel each other, the first iron core 112 and the second iron core 212 will push each other away. This repulsive force acts on the door 200, thereby pushing the door 200 to open, realizing the non-contact opening of the door 200.

[0055] For example, the materials of the first iron core 112 and the second iron core 212 may include, but are not limited to, ferrite, silicon steel, soft magnetic alloy, ferrite nanoparticles, ferrite boron magnets, etc., and this embodiment does not specifically limit them.

[0056] In one optional implementation, combined with Figure 1 and Figure 2 As shown, the axis of the first iron core 112 and the axis of the second iron core 212 are on the same straight line, so that the magnetic fields generated by the first iron core 112 and the second iron core 212 are parallel and symmetrical in space. Due to the alignment of the axes, the repulsive force of the magnetic field will be transmitted along the axis direction, thereby pushing the door 200 more effectively.

[0057] In one alternative implementation, refer to Figure 1 As shown, the refrigeration equipment door opening system also includes a first mounting box 120 and a second mounting box 220. The first mounting box 120 is installed on the cabinet 100, and the first electromagnetic coil assembly 110 is installed inside the first mounting box 120. The second mounting box 220 is installed on the door 200, and the second electromagnetic coil assembly 210 is installed inside the second mounting box 220.

[0058] By installing the electromagnetic coil assembly within its corresponding mounting box, it can be protected from external physical damage such as impacts, dust, and other environmental factors, thus extending its lifespan. Furthermore, the electromagnetic coil assembly can be concealed within the mounting box, enabling a discreet design for the door opening system. The mounting box can be designed to harmonize with the overall appearance of the refrigerator, enhancing the product's aesthetics. The electromagnetic coil assembly can be modularly installed within the mounting box, facilitating installation and maintenance.

[0059] Understandably, the size and shape of the mounting box can be designed to match the size and shape of the electromagnetic coil assembly; for example, the mounting box can be square or cylindrical.

[0060] Optionally, the mounting box can be designed with heat dissipation capabilities, such as by providing ventilation holes or equipping it with heat-dissipating material to prevent overheating of the electromagnetic coil assembly. Optionally, a shielding component can also be installed inside the mounting box to shield against electromagnetic interference.

[0061] In one alternative implementation, refer to Figure 2 and Figure 3 As shown, first limiting members 121 are provided on opposite sides (e.g., left and right sides, top and bottom sides, or all sides) inside the first mounting box 120. The first limiting members 121 are used to fix the first coil 111 of the first electromagnetic coil assembly 110, thereby preventing the first coil 111 from being displaced under the action of electromagnetic force, and ensuring the stability and long-term reliability of the first electromagnetic coil assembly 110.

[0062] In another alternative implementation, refer to Figure 2 and Figure 4 As shown, the second mounting box 220 is provided with second limiting members 221 on both opposite sides. The second limiting members 221 are used to fix the second coil 211 of the second electromagnetic coil assembly 210, and can also prevent the second coil 211 from being displaced under the action of electromagnetic force, so as to ensure the stability and long-term reliability of the second electromagnetic coil assembly 210.

[0063] In one alternative implementation, refer to Figure 1 As shown, the first mounting box 120 and the second mounting box 220 are respectively installed on the outside of the housing 100 and the door 200, for example, on the top or bottom of the outside of the housing 100 and the door 200, so as to avoid affecting the internal space of the refrigeration equipment and to help the heat dissipation of the first electromagnetic coil assembly 110 and the second electromagnetic coil assembly 210.

[0064] In one alternative implementation, refer to Figure 5 As shown, the first mounting box 120 is embedded in the cabinet 100, and the second mounting box 220 is embedded in the door 200. The embedded hidden design makes the refrigerator appearance smoother and more beautiful, and can also better protect the electromagnetic coil components, reduce the influence of the external environment, and help improve the overall integration of the system, making the structure of the refrigeration equipment more compact.

[0065] In one alternative implementation, refer to Figure 2 As shown, the refrigeration equipment door opening system also includes a controller 400 and a door opening trigger. The controller 400 is located in the cabinet 100. The controller 400 is configured to control the power supply device 300 to supply power to the first electromagnetic coil assembly 110 and the second electromagnetic coil assembly 210 when a door opening signal is received. The door opening trigger is used to send a door opening signal to the controller 400.

[0066] The door opening trigger is the interface through which the user interacts with the door opening system. It can be a button, touchscreen, gesture recognition device, voice recognition device, smart lock, or other sensor used to send an opening signal to the controller 400. The opening signal can be an optical signal, electrical signal, voice signal, or image signal, etc. Users can trigger the door to open with simple operations, improving ease of use.

[0067] The refrigeration equipment door opening system provided in this application includes a housing 100, a door 200, and a power supply device 300. The housing 100 is equipped with a first electromagnetic coil assembly 110. The door 200 is rotatably mounted on the housing 100 and is equipped with a second electromagnetic coil assembly 210, which is positioned corresponding to the first electromagnetic coil assembly 110. The power supply device 300 supplies power to the first electromagnetic coil assembly 110 and the second electromagnetic coil assembly 210 when the door 200 needs to be opened. The magnetic poles on the sides of the first electromagnetic coil assembly 110 and the second electromagnetic coil assembly 210 that are close to each other are identical. Utilizing the principle of repulsion between like magnetic poles, the repulsive force generated by the electromagnetic coil assemblies can push the door 200 open, achieving a non-contact door opening method. This avoids the noise that may be generated during the opening process of traditional push rod or slider mechanisms, improving the user experience.

[0068] In an optional implementation, when closing the door, the direction of the current in the first electromagnetic coil assembly 110 or the second electromagnetic coil assembly 210 can be adjusted so that the magnetic fields generated by the two electromagnetic coil assemblies attract each other, thereby achieving a tight closure of the door 200 and ensuring the sealing performance between the door 200 and the housing 100.

[0069] Secondly, this application also provides a refrigeration device, which includes the refrigeration device door opening system described in the above embodiments.

[0070] It is understood that the refrigeration equipment in this embodiment may include, but is not limited to, electrical appliances such as refrigerators, freezers, and display cases. Taking a refrigerator as an example, the refrigerator may be a single-door refrigerator, a double-door refrigerator, or a multi-door refrigerator, etc., and this embodiment does not make specific limitations in this regard.

[0071] It is understood that if the door opening system of the refrigeration equipment has the beneficial effects of the above embodiments, then the refrigeration equipment will have the beneficial effects of the above embodiments accordingly. The specific implementation method can be referred to the above embodiments, and this embodiment will not repeat it.

[0072] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate this application and are not intended to limit this application. Although this application has been described in detail with reference to the embodiments, those skilled in the art should understand that various combinations, modifications, or equivalent substitutions of the technical solutions of this application do not depart from the spirit and scope of the technical solutions of this application and should all be covered within the protection scope of this application.

Claims

1. A door opening system for a refrigeration equipment, characterized in that, include: The enclosure contains the first electromagnetic coil assembly; The door is rotatably mounted on the housing, and the door is equipped with a second electromagnetic coil assembly, which is configured to correspond to the first electromagnetic coil assembly. A power supply device is provided to supply power to the first electromagnetic coil assembly and the second electromagnetic coil assembly when the door needs to be opened, wherein the magnetic poles of the first electromagnetic coil assembly and the second electromagnetic coil assembly are the same on the side closest to each other.

2. The refrigeration equipment door opening system according to claim 1, characterized in that, There are multiple first electromagnetic coil assemblies and multiple second electromagnetic coil assemblies, and the first electromagnetic coil assemblies and the second electromagnetic coil assemblies are arranged in a one-to-one correspondence.

3. The refrigeration equipment door opening system according to claim 1, characterized in that, The rotating side of the door is rotatably connected to the housing, and the second electromagnetic coil assembly is installed on the side of the door away from the rotating side.

4. The refrigeration equipment door opening system according to claim 1, characterized in that, The refrigeration equipment door opening system also includes: A first mounting box is installed in the housing, and the first electromagnetic coil assembly is installed inside the first mounting box; The second mounting box is installed on the door body, and the second electromagnetic coil assembly is installed inside the second mounting box.

5. The refrigeration equipment door opening system according to claim 4, characterized in that, The first mounting box has a first limiting member on each of its opposite sides. The first limiting member is used to fix the first coil of the first electromagnetic coil assembly. And / or, the second mounting box is provided with second limiting members on both opposite sides, the second limiting members being used to fix the second coil of the second electromagnetic coil assembly.

6. The refrigeration equipment door opening system according to claim 4, characterized in that, The first mounting box and the second mounting box are respectively installed on the outside of the housing and the door; Alternatively, the first mounting box is embedded within the housing, and the second mounting box is embedded within the door.

7. The refrigeration equipment door opening system according to claim 1, characterized in that, The first electromagnetic coil assembly includes a first iron core and a first coil wound around the first iron core, and the second electromagnetic coil assembly includes a second iron core and a second coil wound around the second iron core; during the opening of the door, the magnetic poles of the first iron core and the second iron core are the same on the side that are close to each other.

8. The refrigeration equipment door opening system according to claim 7, characterized in that, The axis of the first iron core and the axis of the second iron core are on the same straight line.

9. The refrigeration equipment door opening system according to any one of claims 1-8, characterized in that, The refrigeration equipment door opening system also includes; A controller is disposed in the enclosure and is configured to control the power supply device to supply power to the first electromagnetic coil assembly and the second electromagnetic coil assembly upon receiving an opening signal. A door opening trigger is used to send the door opening signal to the controller.

10. A refrigeration device, characterized in that, The refrigeration equipment includes the refrigeration equipment door opening system as described in any one of claims 1-9.