Refrigerator and temperature controller thereof

Abstract

The first end of the temperature controller is electrically connected with a power source, the second end of the temperature controller is electrically connected with an evaporator, and the third end of the temperature controller is electrically connected with an evaporation fan. The temperature controller is provided with an operation part, and under the first gear, the first end is disconnected with the second end and the third end, so that the evaporator and the evaporation fan stop working; under the second gear, the first end is respectively conducted with the second end and the third end so as to enable the evaporator and the evaporation fan to work, or the first end and the second end are conducted and the first end and the third end are disconnected so as to enable the evaporation fan to work under the condition that the evaporator stops working; according to the technical scheme, by optimizing the control mode of the temperature controller, independent control over the evaporator and the evaporation fan is achieved, and the limitation of the synchronous control mode of an existing mechanical temperature controller is overcome.

Description

Technical Field

[0001] This application relates to the field of refrigeration technology, and in particular to a freezer and its thermostat. Background Technology

[0002] In existing refrigeration systems, such as Figure 1 As shown, mechanical thermostats are typically used to control the operation of the evaporator and evaporative fan. When the ambient temperature reaches the set value, the mechanical thermostat closes, driving the evaporator and evaporative fan to start synchronously, achieving cooling. When the temperature drops below the set value, the mechanical thermostat opens, and the aforementioned equipment stops operating to avoid over-cooling. However, this simple control method has certain drawbacks, especially since the evaporative fan also shuts down when the evaporator stops working, preventing the evaporator from receiving airflow for defrosting. Because the moisture accumulated on the evaporator surface cannot evaporate in time, it will form an ice layer, affecting heat exchange efficiency and even causing air duct blockage, reducing system performance. Furthermore, forced ventilation by the evaporative fan is crucial for improving the evaporation effect of the evaporator, and the synchronous control method of traditional mechanical thermostats limits the effectiveness of this function. Utility Model Content

[0003] This application provides a freezer and its thermostat to solve the problem that when the mechanical thermostat is disconnected, the evaporator fan also shuts down, preventing the evaporator from continuing to receive airflow for auxiliary defrosting.

[0004] In a first aspect, a thermostat for a freezer is provided, the thermostat having a first terminal, a second terminal and a third terminal; the first terminal of the thermostat is used for electrical connection to a power source; the second terminal of the thermostat is used for electrical connection to the evaporator of the freezer; and the third terminal of the thermostat is used for electrical connection to the evaporator fan of the freezer.

[0005] The thermostat has an operating component that can be switched by the user to a first setting and a second setting. In the first setting, the first terminal of the thermostat is disconnected from the second and third terminals, respectively, to stop the evaporator and the evaporation fan from working. In the second setting, the first terminal of the thermostat is connected to the second and third terminals, respectively, to enable the evaporator and the evaporation fan to work. Alternatively, the first terminal of the thermostat is connected to the second terminal, and the first terminal of the thermostat is disconnected from the third terminal, to enable the evaporation fan to work while the evaporator is stopped.

[0006] In the above solution, by optimizing the control method of the thermostat, independent control of the evaporator and evaporator fan is achieved, overcoming the limitations of the synchronous control method of existing mechanical thermostats. In the first setting, the thermostat cuts off the power to the evaporator and evaporator fan, causing the freezer to completely stop working, suitable for equipment maintenance or energy-saving needs. In the second setting, the thermostat can control the start and stop of the evaporator and evaporator fan separately according to the operating mode, giving the system greater operational flexibility. In particular, when the evaporator stops working, the thermostat can still keep the evaporator fan running, allowing air to continuously flow through the evaporator, achieving auxiliary defrosting, effectively reducing ice buildup, improving heat exchange efficiency, and preventing air duct blockage. In addition, the continuous ventilation of the evaporator fan enhances the evaporation effect of the evaporator, improves the overall cooling performance, optimizes energy consumption management, ensures that the freezer operates in a more stable and efficient state, and extends the service life of the equipment, improving the user experience.

[0007] In some embodiments, a thermostat for a freezer is provided, the thermostat including a rotary switch and a temperature switch, the rotary switch including a knob, a first end and a second end; the knob serves as the operating component, the first end of the rotary switch leads out to the first end of the thermostat, and the second end of the rotary switch leads out to the third end of the thermostat; the temperature switch includes a first end and a second end, the first end of the temperature switch is connected to the second end of the rotary switch, and the second end of the temperature switch leads out to the second end of the thermostat;

[0008] When the knob is rotated to the first position, the first and second ends of the knob switch are disconnected, so that the first end of the thermostat is disconnected from the second and third ends respectively.

[0009] When the knob is rotated to the second position, the first and second terminals of the knob switch are connected, so that the first and third terminals of the thermostat are connected. When the temperature switch detects that the freezer temperature is greater than the temperature threshold, the first and second terminals of the temperature switch are connected, so that the first and second terminals of the thermostat are connected. When the temperature switch detects that the freezer temperature is less than the temperature threshold, the first and second terminals of the temperature switch are disconnected, so that the first and second terminals of the thermostat are disconnected.

[0010] In the above solution, the combination of a rotary switch and a temperature switch enables precise control of the freezer evaporator and evaporator fan. In the first position, the rotary switch disconnects the circuit, effectively stopping the operation of the evaporator and evaporator fan, ensuring the equipment is in a shut-off state, reducing energy consumption and protecting the equipment. In the second position, the rotary switch connects the circuit, and in conjunction with the temperature switch, automatically adjusts the equipment operation according to the freezer temperature. When the temperature is higher than the set threshold, the evaporator is activated to achieve efficient cooling. When the temperature is lower than the threshold, it is automatically disconnected to avoid over-operation. This solution offers energy-saving, easy-to-operate, and highly reliable technical benefits.

[0011] In some embodiments, a thermostat for a freezer is provided. The rotary switch further includes an off position, at least one temperature adjustment position, and a temperature threshold setting module. The knob has a fixed connection end and a switching end. The fixed end of the knob is the first end of the rotary switch. The first end of the off position and the first end of each temperature adjustment position are connected to the second end of the rotary switch. The second end of each temperature adjustment position is also connected to one end of the temperature threshold setting module. The other end of the temperature threshold setting module is connected to the control end of the temperature switch.

[0012] When the knob is rotated to switch the knob's switching end to be connected to the second end of the disconnect position, the knob is in the first position;

[0013] When the knob is rotated to switch the knob's switching end to be connected to the second end of any of the temperature adjustment settings, the temperature threshold setting module sets the temperature threshold of the temperature switch, and the knob is in the second setting.

[0014] In the above solution, flexible control of the freezer is achieved through the switching of a rotary switch, providing a disconnect position and multiple temperature adjustment positions to meet different usage needs. In the disconnect position, the thermostat cuts off the power connection, causing the evaporator and evaporator fan to completely stop working, effectively saving energy and suitable for equipment shutdown or maintenance. In the temperature adjustment position, the temperature threshold setting module accurately adjusts the temperature control state according to the temperature threshold set by the user, ensuring that the freezer operates efficiently within the set temperature range. The thermostat can automatically adjust the start and stop of the cooling system according to the external ambient temperature, improving temperature control accuracy, optimizing energy consumption management, and enhancing the operational stability and service life of the freezer.

[0015] In some embodiments, a temperature controller for a freezer is provided, wherein the temperature switch includes a first metal plate and a second metal plate, a first end of the first metal plate leads out to a first end of the temperature switch, the second end of the first metal plate and the first end of the second metal plate are arranged parallel to each other with a distance between them, and the second end of the second metal plate leads out to a second end of the temperature switch.

[0016] The temperature threshold setting module is connected to the first metal plate or the second metal plate. When the knob is switched to the temperature adjustment position, the temperature threshold setting module adjusts the distance between the second end of the first metal plate and the first end of the second metal plate to adjust the temperature threshold of the temperature switch.

[0017] In the above solution, precise control of the freezer's start-up temperature is achieved by adjusting the distance between the first and second metal plates of the temperature switch. The temperature threshold setting module can adjust the distance between the two plates to set the trigger temperature of the temperature switch, thereby improving the sensitivity and adaptability of the temperature controller. When the distance is reduced, the freezer starts earlier at a lower temperature, while when the distance is increased, the freezer's start-up temperature is increased, allowing users to flexibly adjust the freezer's operating temperature range according to their needs. This implementation method achieves adjustable temperature control, improves the freezer's energy-saving effect and service life, and ensures that the freezer operates efficiently within the set temperature range.

[0018] In some embodiments, a temperature controller for a freezer is provided. The temperature switch includes a control module, a switch module, and a temperature sensor. One end of the switch module is a first end of the temperature switch, and the other end of the switch module is a second end of the temperature switch. A first input end of the control module is connected to the signal output end of the temperature threshold setting module, a second input end of the control module is connected to the output end of the temperature sensor, and the output end of the control module is connected to the control end of the switch module.

[0019] The control module sets a temperature threshold according to the control signal output by the temperature threshold setting module, and controls the switch module to turn on when the temperature sensor detects that the freezer temperature is greater than the temperature threshold, and controls the switch module to turn off when the temperature sensor detects that the freezer temperature is less than the temperature threshold.

[0020] In the above solution, precise temperature control of the freezer is achieved through intelligent control of the temperature switch, combined with real-time detection of the temperature sensor and dynamic adjustment of the control module. The temperature switch can be set with different temperature thresholds according to the knob switch to ensure that the evaporator operates within a suitable temperature range, avoid over-cooling, and reduce energy consumption.

[0021] In some embodiments, a temperature controller for a freezer is provided, wherein the temperature threshold setting module is an elastic module, and when the rotary switch is in the second position, the elastic module sends an elastic signal corresponding to the current temperature setting to the control module.

[0022] The control module includes a pressure sensor and a control unit. The detection end of the pressure sensor is the first input end of the control module. The output end of the pressure sensor is connected to the first signal input end of the control unit. The second signal input end of the control unit is the second input end of the control module. The output end of the control unit is the output end of the control module.

[0023] The pressure sensor outputs a detection signal to the control unit based on the elastic signal, and the control unit sets a temperature threshold based on the detection signal.

[0024] In the above solution, precise temperature regulation is achieved through the cooperation of the elastic module, pressure sensor and control unit. Different temperature adjustment positions of the knob switch correspond to different elastic signals. The pressure sensor detects the signals and transmits them to the control unit, which automatically adjusts the temperature threshold and optimizes the cooling control. Compared with traditional mechanical thermostats, this solution improves temperature control accuracy, avoids over-cooling and reduces energy consumption.

[0025] In some embodiments, a temperature controller for a freezer is provided, wherein the temperature threshold setting module is a relay module, and when the rotary switch is in the second position, the relay module sends an electrical signal corresponding to the current temperature setting to the control module.

[0026] The control module includes a current sensor and a control unit. The detection terminal of the current sensor is the first input terminal of the control module. The output terminal of the current sensor is connected to the first signal input terminal of the control unit. The second signal input terminal of the control unit is the second signal input terminal of the control module. The output terminal of the control unit is the output terminal of the control module.

[0027] The current sensor is configured to:

[0028] The electrical signal is used to output a detection signal to the control unit, so that the control unit can set a temperature threshold based on the detection signal.

[0029] In the above solution, the cooperation of relay module, current sensor and control unit realizes an efficient, accurate and reliable temperature regulation method. The user selects the temperature adjustment level by turning the knob switch, the relay module outputs the corresponding electrical signal, the current sensor detects the signal, and the control unit automatically adjusts the temperature threshold according to the signal to ensure that the freezer operates within the optimal temperature range, reduce energy consumption, improve refrigeration efficiency and extend the service life of the equipment.

[0030] Secondly, a freezer is provided, including the aforementioned thermostat, evaporator, and evaporation fan.

[0031] It is understandable that the beneficial effects of the second aspect mentioned above can be found in the relevant descriptions in the first aspect mentioned above, and will not be repeated here. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a structural diagram of a freezer provided by existing technology;

[0034] Figure 2 This is a schematic diagram of the first structure of a freezer in Embodiment 1 of this utility model;

[0035] Figure 3 This is a schematic diagram of the structure of a temperature controller in a freezer according to Embodiment 1 of this utility model;

[0036] Figure 4 This is a schematic diagram of the structure of a rotary switch in a thermostat in a freezer according to Embodiment 1 of this utility model;

[0037] Figure 5 This is a schematic diagram of the temperature switch in a thermostat of a freezer according to Embodiment 1 of this utility model;

[0038] Figure 6 This is a schematic diagram of the temperature switch in a thermostat of a freezer according to Embodiment 1 of this utility model;

[0039] Figure 7 This is a schematic diagram of the connection between the elastic module and the temperature switch in the thermostat of a freezer according to Embodiment 1 of this utility model;

[0040] Figure 8 This is a schematic diagram of the connection between the relay module and the temperature switch in the temperature controller of a freezer according to Embodiment 1 of this utility model;

[0041] Figure 9 This is a schematic diagram of the second structure of a freezer in Embodiment 1 of this utility model;

[0042] Figure 10 This is a schematic diagram of the third structure of a freezer in Embodiment 1 of this utility model;

[0043] Figure 11 This is a schematic diagram of the structure of a rotary switch in a freezer according to Embodiment 1 of this utility model;

[0044] In the diagram: 10, thermostat; 20, power supply; 30, evaporator; 40, evaporator fan; 100, operating component; 101, rotary switch; 102, temperature switch; 111, off position; 112, temperature adjustment position; 113, temperature threshold setting module; 114, first metal plate; 115, second metal plate; 121, switch module; 122, control module; 123, temperature sensor; 131, elastic module; 132, pressure sensor; 133, control unit; 134, relay module; 135, current sensor; 141, lamp switch module; 142, power adapter; 143, lamp module. Detailed Implementation

[0045] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0046] It should be understood that, when used in this specification and appended claims, unless otherwise stated, the term " / " means "or," for example, A / B can mean A or B; "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist, for example, A and / or B can represent: A alone, A and B simultaneously, and B alone. Furthermore, in the description of the embodiments in this application, "multiple" refers to two or more.

[0047] In the description of this utility model specification and the appended claims, the term "comprising" indicates the presence of a described feature, integral, step, operation, element, and / or component, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or collections thereof. It should also be understood that the term "and / or" as used in this utility model specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0048] Furthermore, in the description of this utility model specification and the appended claims, the terms "first," "second," "third," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0049] References to "one embodiment" or "some embodiments" in this specification mean that one or more embodiments of the present invention include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0050] It should be understood that the sequence number of each step in the following embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of this utility model embodiment.

[0051] To facilitate a further understanding of the technical solutions in some embodiments of this application, the technical solutions of the freezer and its refrigeration system, and how these solutions solve the aforementioned technical problems, are described in detail below with reference to specific embodiments and accompanying drawings. The embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this application.

[0052] In some embodiments, such as Figure 2 As shown, a thermostat 10 for a freezer is provided. The thermostat 10 has a first terminal A1, a second terminal A2, and a third terminal A3. The first terminal A1 of the thermostat 10 is used to electrically connect to a power supply 20. The second terminal A2 of the thermostat 10 is used to electrically connect to the evaporator 30 of the freezer. The third terminal A3 of the thermostat 10 is used to electrically connect to the evaporator fan 40 of the freezer.

[0053] The thermostat 10 has an operating component 100, which can be switched by the user to a first position and a second position. In the first position, the first terminal A1 of the thermostat 10 is disconnected from the second terminal A2 and the third terminal A3 of the thermostat 10, respectively, to stop the evaporator 30 and the evaporator fan 40 from working. In the second position, the first terminal A1 of the thermostat 10 is connected to the second terminal A2 and the third terminal A3 of the thermostat 10, respectively, to enable the evaporator 30 and the evaporator fan 40 to work. Alternatively, the first terminal A1 of the thermostat 10 is connected to the second terminal A2 of the thermostat 10, and the first terminal A1 of the thermostat 10 is disconnected from the third terminal A3 of the thermostat 10, to enable the evaporator fan 40 to work when the evaporator 30 is stopped.

[0054] The thermostat 10 has its first terminal A1 connected to the power supply 20, ensuring the power supply for the entire thermostat 10. Terminal A1 is the basic power input terminal for the normal operation of the thermostat 10. When the freezer is plugged in and activated, terminal A1 receives power current, providing power to other modules connected to the thermostat 10. Depending on the operating position, terminal A1 is connected or disconnected from other ports (second terminal A2 and third terminal A3). The second terminal A2 of the thermostat 10 is electrically connected to the evaporator 30 of the freezer. Through this terminal, the thermostat 10 can control the operating state of the evaporator 30. In the first position, terminal A2 is disconnected from terminal A1, and the evaporator 30 stops working; in the second position, terminal A2 is connected to terminal A1, causing the evaporator 30 to start and operate, helping to cool the freezer. The third terminal A3 of the thermostat 10 is electrically connected to the evaporator fan 40 of the freezer, controlling the on / off state of the evaporator fan 40. In the first setting, terminal A3 is disconnected from terminal A1, and the evaporator fan 40 stops working. In the second setting, terminal A3 is connected to terminal A1, causing the evaporator fan 40 to start working, typically working in conjunction with the evaporator 30 to ensure continued airflow for defrosting. Specifically, if terminal A1 is disconnected from terminal A2 in the second setting, the evaporator fan 40 continues to operate, but the evaporator 30 stops working. This is typically used for special operating modes, such as preventing frost buildup or specific maintenance modes. The operating component 100 allows the user to switch the operating mode of the thermostat 10 by selecting different settings. The user selects the first or second setting by switching the operating component 100. In the first setting, terminals A1, A2, and A3 of the thermostat 10 are all disconnected, and both the evaporator 30 and the evaporator fan 40 stop working, typically used to shut down the freezer or for equipment maintenance. In the second position, both terminals A1 and A2, and both A1 and A3 are connected, causing the evaporator 30 and evaporator fan 40 to start working, and the freezer to enter normal operation. Alternatively, under specific circumstances, terminals A1 and A2 can be disconnected, while terminals A1 and A3 are connected, allowing only the evaporator fan 40 to operate, while the evaporator 30 stops working.

[0055] It should be noted that the switching of gears by the operating component 100 is usually accomplished through mechanical or electronic means, including but not limited to the following structures:

[0056] 1. Mechanical switch method: The operating component 100 is a physical knob or toggle switch, which the user can rotate or toggle to select different gears.

[0057] 2. Electronic switch (touch or button): The operating component 100 is an electronic touch screen or button, and the user selects the gear by pressing the button or touching the interface.

[0058] 3. Rotary encoder: The operating component 100 is a rotary encoder, which allows the user to select different speeds.

[0059] The technical advantages of this embodiment are as follows: By optimizing the control method of the thermostat, independent control of the evaporator and the evaporator fan is achieved, overcoming the limitations of the synchronous control method of existing mechanical thermostats. In the first setting, the thermostat cuts off the power to the evaporator and the evaporator fan, causing the freezer to completely stop working, suitable for equipment maintenance or energy-saving needs. In the second setting, the thermostat can control the start and stop of the evaporator and the evaporator fan separately according to the operating mode, giving the system greater operational flexibility. In particular, when the evaporator stops working, the thermostat can still keep the evaporator fan running, allowing air to continuously flow through the evaporator, achieving auxiliary defrosting, effectively reducing ice buildup, improving heat exchange efficiency, and preventing air duct blockage. In addition, the continuous ventilation of the evaporator fan enhances the evaporation effect of the evaporator, improves the overall cooling performance, optimizes energy consumption management, ensures that the freezer operates in a more stable and efficient state, and extends the service life of the equipment, improving the user experience.

[0060] As one implementation method, such as Figure 3 As shown, the thermostat 10 includes a rotary switch 101 and a temperature switch 102. The rotary switch 101 includes a knob, a first end, and a second end. The knob serves as an operating component 100. The first end of the rotary switch 101 leads out to the first end of the thermostat 10, and the second end of the rotary switch 101 leads out to the third end of the thermostat 10. The temperature switch 102 includes a first end and a second end. The first end of the temperature switch 102 is connected to the second end of the rotary switch 101, and the second end of the temperature switch 102 leads out to the second end of the thermostat 10.

[0061] When the knob is rotated to the first position, the first and second ends of the knob switch 101 are disconnected, so that the first end of the thermostat 10 is disconnected from the second and third ends respectively.

[0062] When the knob is rotated to the second position, the first and second terminals of the knob switch 101 are connected, so that the first and third terminals of the thermostat 10 are connected. When the temperature switch 102 detects that the freezer temperature is greater than the temperature threshold, the first and second terminals of the temperature switch 102 are connected, so that the first and second terminals of the thermostat 10 are connected. When the temperature switch 102 detects that the freezer temperature is less than the temperature threshold, the first and second terminals of the temperature switch 102 are disconnected, so that the first and second terminals of the thermostat 10 are disconnected.

[0063] The rotary switch 101 serves as the primary interaction component between the user and the thermostat 10, switching the operating positions of the thermostat 10 based on the user's rotation. The knob is a physical operating component with a rotational function, allowing selection of different positions. Rotation of the knob alters its internal switching mechanism, thus selecting different operating states. The rotary switch 101 has at least two positions. When the knob is rotated to the first position, the first and second terminals of the rotary switch 101 are disconnected. At this time, the first terminal A1 of the thermostat 10 is disconnected from the second and third terminals A2 and A3, cutting off the current and stopping the evaporator 30 and evaporator fan 40. This is used for shutdown or maintenance, ensuring the equipment is in a non-operating state and avoiding unnecessary energy consumption. When the knob is rotated to the second position, the first terminal A1 of the rotary switch 101 is connected to the second terminal A2. At this time, the first terminal A1 of the thermostat 10 is connected to the third terminal A3, starting the evaporator fan 40. Temperature switch 102 monitors the freezer temperature and controls the conduction state of thermostat 10 according to a preset temperature threshold, determining whether to start the evaporator 30. When the outside temperature exceeds the set threshold, the first and second terminals of temperature switch 102 are connected. At this time, the first terminal A1 and the second terminal A2 of thermostat 10 are connected, allowing current to flow into the evaporator 30, enabling it to start working and refrigerating. When the freezer temperature drops below the threshold set by temperature switch 102, the first and second terminals of temperature switch 102 are disconnected, and the first terminal A1 and the second terminal A2 of thermostat 10 are disconnected, thereby cutting off the power supply to the evaporator and stopping its operation.

[0064] The technical advantages of this embodiment are as follows: By combining the rotary switch 101 and the temperature switch 102, precise control of the freezer evaporator and evaporator fan is achieved; in the first position, the rotary switch 101 disconnects the circuit, effectively stopping the operation of the evaporator and evaporator fan, ensuring that the equipment is in a closed state, reducing energy consumption and protecting the equipment; in the second position, the rotary switch 101 connects the circuit, and in conjunction with the temperature switch 102, the equipment operation is automatically adjusted according to the freezer temperature. When the temperature is higher than the set threshold, the evaporator is activated to achieve efficient cooling, and when the temperature is lower than the threshold, it is automatically disconnected to avoid over-operation. This has the technical advantages of energy saving, simple operation, and high reliability.

[0065] As one implementation method, such as Figure 4 As shown, the rotary switch 101 also includes an off position 111, at least one temperature adjustment position 112, and a temperature threshold setting module 113. The knob has a fixed connection end A0 and a switching end B0. The fixed end A0 of the knob is the first end of the rotary switch 101. The first end of the off position 111 and the first end of each temperature adjustment position are connected together to form the second end of the rotary switch 101. The second end of each temperature adjustment position is also connected to one end of the temperature threshold setting module 113. The other end of the temperature threshold setting module 113 is connected to the control end of the temperature switch 102.

[0066] When the knob is rotated, the switching end B0 of the knob is switched to be connected to the second end of the disconnect position 111, and the knob is in the first position.

[0067] When the knob is rotated, the switching end B0 of the knob is switched to be connected to the second end of any temperature adjustment position 112. The temperature threshold setting module 113 sets the temperature threshold of the temperature switch, and the knob is in the second position.

[0068] The knob is the main interface between the user and the thermostat. Rotation selects different settings, switching between different operating levels. The switching terminal B0 connects the fixed terminal A0 to either the disconnect position 111 or the temperature adjustment position 112 to enter the first or second setting. The main function of the disconnect position 111 is to completely shut down the freezer, cutting off the connection between the power supply 20 and the evaporator 30, evaporator fan 40, etc. It is a structure used for stopping or shutting down the equipment and can disconnect the circuit. When the knob is rotated to the disconnect position 111, the switching terminal B0 of the knob switch 101 connects to the second terminal of the disconnect position 111, causing the first terminal A1 of the thermostat 10 to disconnect from the second terminal A2 and the third terminal A3. At this time, the evaporator 30 and the evaporator fan 40 no longer receive current, stopping all cooling operations. The temperature adjustment setting 112 allows users to adjust the operating temperature range of the freezer according to their needs. Different temperature adjustment settings 112 are selected via a knob to control the operating state of the thermostat 10 and set the desired temperature threshold. The temperature adjustment setting 112 can be multiple parallel conducting circuits. When the knob is rotated to the temperature adjustment setting 112, the switching terminal of the knob switch 101 connects to the second terminal of the temperature adjustment setting 112, activating the temperature threshold setting module 113. At the temperature adjustment setting 112, the temperature threshold setting module 113 sets a temperature threshold based on the selected setting. This temperature threshold is transmitted to the control terminal of the temperature switch 102. If the external ambient temperature exceeds the set threshold, the temperature switch 102 is activated, starting the evaporator 30 of the freezer. If the external temperature is lower than the set threshold, the temperature switch 102 is deactivated, and the freezer's refrigeration system stops working. The temperature threshold setting module 113 is used to adjust the temperature threshold of the temperature switch 102, ensuring the freezer operates within the required temperature range and achieving precise temperature control. When the knob selects temperature setting 112, the second end of the knob switch 101 is connected to one end of the temperature threshold setting module 113, and the temperature threshold setting module 113 starts working. The temperature threshold setting module 113 sets a specific temperature value according to the selected setting and transmits the temperature value to the control terminal of the temperature switch 102.

[0069] The structure of the temperature threshold setting module 113 can be designed in different ways according to application requirements and accuracy requirements, including but not limited to the following structures:

[0070] 1. Mechanical Temperature Threshold Adjustment Structure: The temperature threshold setting module 113 is a spring-loaded mechanism, and the temperature switch 102 is a bimetallic temperature switch. When the knob adjusts the preset temperature, it changes the elasticity of the spring-loaded mechanism, thereby changing the initial position of the bimetallic strip and altering the range of its contact opening or closing temperature. When the ambient temperature rises above the set value, the bimetallic strip bends due to heat, pushing the mechanical contacts to disconnect the circuit and stop the cooling system from working. When the ambient temperature drops below the set value, the bimetallic strip returns to its shape, the contacts close again, and the cooling system restarts.

[0071] 2. Electronic Variable Resistor: The temperature threshold setting module 113 is a voltage divider circuit. The potentiometer knob changes the output voltage of the voltage divider circuit, which serves as a reference value for the temperature setting. The temperature switch 102 includes a sensor and a comparator. The sensor (such as an NTC thermistor) detects the current temperature and generates a corresponding voltage signal. The comparator compares the detected temperature signal with the set value: if the temperature is higher than the set value, it outputs a low-level signal to disconnect the cooling device. If the temperature is lower than the set value, it outputs a high-level signal to activate the cooling device.

[0072] 3. Digital Temperature Threshold Setting Module: The temperature threshold setting module 113 is a rotary encoder or button. The temperature switch 102 includes an MCU and a sensor. The user-set temperature value is input via the knob or button and stored in the MCU's internal register or EEPROM. The MCU collects the current ambient temperature data through the sensor and compares it with the set temperature value in real time. If the current temperature is higher than the set temperature, the MCU outputs a signal to turn off the cooling device. If the current temperature is lower than the set temperature, the MCU outputs a signal to turn on the cooling device.

[0073] The technical advantages of this embodiment are as follows: Flexible control of the freezer is achieved through the switching of the rotary switch 101, providing a disconnect position 111 and multiple temperature adjustment positions 112 to meet different usage needs; in the disconnect position 111, the thermostat 10 cuts off the power connection, causing the evaporator 30 and evaporator fan 40 to completely stop working, effectively saving energy and suitable for equipment shutdown or maintenance; in the temperature adjustment position 112, the temperature threshold setting module 113 accurately adjusts the temperature control state according to the user-set temperature threshold, ensuring the freezer operates efficiently within the set temperature range; the thermostat 10 can automatically adjust the start and stop of the cooling system according to the external ambient temperature, improving temperature control accuracy, optimizing energy consumption management, and enhancing the freezer's operational stability and service life.

[0074] As one implementation method, such as Figure 5As shown, the temperature switch 102 includes a first metal piece 114 and a second metal piece 115. The first end A4 of the first metal piece 114 leads out to the first end of the temperature switch 102. The second end of the first metal piece 114 and the first end of the second metal piece 115 are arranged parallel to each other with a distance between them. The second end A5 of the second metal piece 115 leads out to the second end of the temperature switch 102.

[0075] The temperature threshold setting module 113 is connected to the first metal plate 114 or the second metal plate 115. When the knob is switched to the temperature adjustment position, the temperature threshold setting module 113 adjusts the distance between the second end of the first metal plate 114 and the first end of the second metal plate 115 to adjust the temperature threshold of the temperature switch 102.

[0076] The first metal piece 114 is the main temperature-sensing element of the temperature switch 102, responding to changes in ambient temperature and controlling the opening and closing of the thermostat 10 through deformation. Its second end is parallel to and spaced relative to the first end of the second metal piece 115, forming a temperature trigger control point. When the temperature rises, the first metal piece 114 expands due to heat, deforming and moving closer to or in contact with the second metal piece 115, thus completing the circuit. At this time, the temperature switch 102 closes, the first and second ends of the thermostat 10 are connected, and the freezer begins to cool. When the temperature drops, the first metal piece 114 cools and springs back, returning to its original shape and disconnecting from the second metal piece 115, thus breaking the circuit. At this time, the temperature switch 102 opens, the first and second ends of the thermostat 10 are disconnected, and the freezer stops cooling. The second metal piece 115 itself remains unchanged, serving only as a contact end; its main function is as a conductive end, forming a temperature-sensitive circuit with the first metal piece 114. The temperature threshold setting module 113 is used to adjust the distance between the first metal plate 114 and the second metal plate 115, thereby controlling the trigger temperature threshold of the temperature switch 102. By changing the initial distance between them, the required deformation of the first metal plate 114 is affected, thus affecting the temperature trigger point. When the knob is switched to the temperature adjustment position, the temperature threshold setting module 113 connects to either the first metal plate 114 or the second metal plate 115, making its position adjustable. Adjusting the distance controls the temperature trigger point. When the distance is reduced, the first metal plate 114 can contact the second metal plate 115 with slight heating, and the temperature switch 102 conducts at a lower temperature, causing the freezer to start earlier. When the distance is increased, the first metal plate 114 requires a higher temperature to bend and contact the second metal plate 115, increasing the freezer's start-up temperature. When the user adjusts the set temperature via the knob, the temperature threshold setting module 113 changes the distance between the first metal plate 114 and the second metal plate 115 to ensure that the thermostat 10 operates within the set temperature range.

[0077] The technical advantages of this embodiment are as follows: By adjusting the distance between the first metal plate 114 and the second metal plate 115 of the temperature switch, precise control of the freezer's start-up temperature is achieved; the temperature threshold setting module 113 can adjust the distance between the two plates, thereby setting the trigger temperature of the temperature switch 102 and improving the sensitivity and adaptability of the temperature controller 10; when the distance is reduced, the freezer starts earlier at a lower temperature, while when the distance is increased, the freezer's start-up temperature increases, allowing users to flexibly adjust the freezer's operating temperature range according to their needs; this embodiment achieves adjustable temperature control, improves the freezer's energy-saving effect and service life, and ensures that the freezer operates efficiently within the set temperature range.

[0078] As one implementation method, such as Figure 6 As shown, the temperature switch 102 includes a control module 122, a switch module 121, and a temperature sensor 123. One end B1 of the switch module 121 is the first end of the temperature switch 102, and the other end B2 is the second end of the temperature switch 102. The first input end B6 of the control module 122 is connected to the signal output end of the temperature threshold setting module 113, the second input end B5 of the control module 122 is connected to the output end B7 of the temperature sensor 123, and the output end B4 of the control module 122 is connected to the control end B3 of the switch module 121. The control module 122 sets the temperature threshold according to the control signal output by the temperature threshold setting module 113, and controls the switch module 121 to turn on when the temperature sensor 123 detects that the freezer temperature is greater than the temperature threshold, and controls the switch module 121 to turn off when the temperature sensor 123 detects that the freezer temperature is less than the temperature threshold.

[0079] In this system, one end B1 of the switch module 121 serves as the power input terminal of the temperature switch 102, receiving power from the rotary switch 101. The other end B2 serves as the power output terminal of the temperature switch 102, controlling the power supply to the compressor 20 and the condenser fan 30. The first input terminal B6 of the control module 122 is the signal input terminal of the temperature switch 102, used to receive control signals from the rotary switch 101 to set a temperature threshold. The second input terminal B5 is connected to the output terminal of the temperature sensor 123 to acquire real-time freezer temperature data. The temperature sensor 123 monitors the internal temperature of the freezer and sends the temperature data to the control module 122. When the rotary switch 101 is in the temperature adjustment position 112, the temperature switch 102 receives power and enters the monitoring state. The control module 122 receives the control signal from the rotary switch 101 and sets the corresponding temperature threshold. The temperature sensor 123 begins to detect the internal temperature of the freezer and sends the data to the control module 122. The control module 122 determines that the current temperature exceeds the temperature threshold and controls the switch module 121 to conduct. The power output terminal begins supplying power to the evaporator 30, enabling it to start cooling. Control module 122 determines that the temperature is low enough and controls switch module 121 to disconnect. This cuts off the power to the evaporator 30, preventing over-cooling and improving energy efficiency. While rotary switch 101 remains in the temperature setting 112, the evaporator fan 40 continues to operate, optimizing air circulation and preventing frost.

[0080] The technical effect of this embodiment is that: through the intelligent control of the temperature switch 102, combined with the real-time detection of the temperature sensor 123 and the dynamic adjustment of the control module 122, precise temperature control of the freezer is achieved; the temperature switch 102 can set different temperature thresholds according to the knob switch 101 to ensure that the evaporator 30 operates within a suitable temperature range, avoid over-cooling, and reduce energy consumption.

[0081] As one implementation method, such as Figure 7 As shown, the temperature threshold setting module 113 is an elastic module 131. When the knob switch 101 is in the second position, the elastic module 131 sends an elastic signal corresponding to the current temperature setting 112 to the temperature switch 102.

[0082] The control module 122 includes a pressure sensor 132 and a control unit 133. The detection end of the pressure sensor 132 is the signal input end of the control module 122. The output end of the pressure sensor 132 is connected to the first input end of the control unit 133. The second signal input end of the control unit 133 is the second signal input end of the control module 122. The output end of the control unit 133 is the output end of the control module 122. The pressure sensor 132 outputs a detection signal to the control unit 133 based on the elastic signal. The control unit 133 sets a temperature threshold based on the detection signal.

[0083] The elastic module 131 is connected to the temperature adjustment settings of the rotary switch 101, and is used to send different elastic signals to the temperature switch 102 at different temperature settings 112. The elastic signal is a signal based on physical deformation (e.g., pressure changes caused by spring compression or deformation of elastic materials). When the rotary switch 101 is in the second setting, adjusting to different temperature settings causes the elastic module 131 to deform to varying degrees, thus affecting signal transmission. The detection end of the pressure sensor 132 is the signal input end, used to receive the elastic signal from the elastic module 131, measure the corresponding pressure value according to the setting changes of the rotary switch 101, and convert it into an electrical signal (detection signal). The output end of the pressure sensor 132 is connected to the control unit 133, sending the measurement results to the control unit 133. The first signal input end of the control unit 133 is connected to the output end of the pressure sensor 132 to receive the pressure detection signal. The second signal input end of the control unit 133 is used to receive temperature information from the temperature sensor 123, combine it with the detection signal from the pressure sensor 132 to set the corresponding temperature threshold, and start or stop the evaporator 30. When the rotary switch 101 is adjusted to different settings, the elastic module 131 deforms, applying different levels of pressure. The elastic signal is detected by the pressure sensor 132 and converted into a corresponding electrical signal (detection signal). Different pressure values ​​correspond to different temperature setpoints. The control unit 133 receives the signal from the pressure sensor 132 and adjusts the operating threshold of the temperature switch 102 accordingly. For example, when the knob is set to a lower temperature setting, the elastic module 131 generates less pressure, the pressure sensor 132 outputs a smaller signal, and the control unit 133 sets a lower temperature threshold. When the knob is set to a higher temperature setting, the elastic module 131 generates more pressure, the pressure sensor 132 outputs a larger signal, and the control unit 133 sets a higher temperature threshold. The temperature sensor 123 monitors the internal temperature of the freezer in real time and sends the data to the control unit 133. When the temperature is higher than the set temperature threshold, the control unit 133 starts the evaporator 30 for cooling; when the temperature drops below the set threshold, the control unit 133 stops the evaporator 30 to prevent over-cooling and reduce energy consumption.

[0084] The technical advantages of this embodiment are as follows: through the cooperation of the elastic module 131, the pressure sensor 132 and the control unit 133, precise temperature regulation is achieved. Different temperature adjustment levels 112 of the rotary switch 101 correspond to different elastic signals. The pressure sensor 132 detects the signal and transmits it to the control unit 133, which automatically adjusts the temperature threshold and optimizes the cooling control. Compared with the traditional mechanical temperature controller 10, this solution improves the temperature control accuracy, avoids over-cooling, and reduces energy consumption.

[0085] As one implementation method, such as Figure 8As shown, the temperature threshold setting module 113 is a relay module 134. When the rotary switch 101 is in the second position, the relay module 134 sends an electrical signal corresponding to the current temperature setting 112 to the temperature switch 102.

[0086] The control module 122 includes a current sensor 135 and a control unit 133. The detection terminal of the current sensor 135 is the signal input terminal of the control module 122. The output terminal of the current sensor 135 is connected to the first input terminal of the control unit 133. The second signal input terminal of the control unit 133 is the second signal input terminal of the control module 122. The output terminal of the control unit 133 is the output terminal of the control module 122. The current sensor 135 outputs a detection signal to the control unit 133 according to the electrical signal. The control unit 133 sets the temperature threshold according to the detection signal.

[0087] The relay module 134 is connected to the rotary switch 101 and sends corresponding electrical signals to the temperature switch 102 at different temperature settings 112. Different temperature settings 112 correspond to different electrical signals, thereby instructing the temperature control system to set different temperature thresholds. The current sensor 135's detection end is connected to the signal input end of the control module 122 to detect the electrical signals output by the relay module 134. Its output end is connected to the first signal input end of the control unit 133, converting the measured electrical signals into detection signals and transmitting them to the control unit 133. The first signal input end of the control unit 133 receives the detection signals from the current sensor 135 to determine the current setting of the rotary switch 101. The second signal input end is connected to the temperature sensor 123 to monitor the freezer temperature in real time. Combined with the detection signals from the current sensor 135, it sets an appropriate temperature threshold and controls the working state of the evaporator 30. When the rotary switch 101 is adjusted to different settings, the relay module 134 outputs different electrical signals according to the setting state. These electrical signals are detected by the current sensor 135 and converted into corresponding detection signals. For example, different temperature adjustment settings 112 of the rotary switch 101 control the conduction state of different relays. The relay module 134 connects to multiple resistor voltage divider networks, with each setting corresponding to a different output voltage. The temperature switch 102 reads this voltage value and sets the corresponding temperature threshold. When the rotary switch 101 selects different settings, the relay module 134 connects different resistor combinations to change the output voltage: setting 1: R1 = 10kΩ, R2 = 2kΩ, output 1.2V; setting 2: R1 = 10kΩ, R2 = 5kΩ, output 2.5V; setting 3: R1 = 10kΩ, R2 = 8kΩ, output 3.8V; setting 4: R1 = 10kΩ, R2 = 10kΩ, output 5.0V. The control unit 133 receives the detection signal from the current sensor 135, analyzes the current temperature adjustment setting 112, and adjusts the temperature threshold of the temperature switch 102. For example: when the knob is set to a lower temperature setting, the relay module 134 outputs a smaller current signal, the current sensor 135 detects the lower signal, and the control unit 133 sets a lower temperature threshold. When the knob is set to a higher temperature setting, the relay module 134 outputs a larger current signal, the current sensor 135 detects the higher signal, and the control unit 133 sets a higher temperature threshold. The temperature sensor 123 monitors the internal temperature of the freezer in real time and sends the data to the control unit 133. When the temperature is higher than the set temperature threshold, the control unit 133 starts the evaporator 30 for cooling; when the temperature drops below the set threshold, the control unit 133 stops the evaporator 30 to prevent over-cooling and reduce energy consumption.

[0088] The technical advantages of this embodiment are as follows: through the cooperation of the relay module 134, the current sensor 135 and the control unit 133, an efficient, accurate and reliable temperature regulation method is achieved. The user selects the temperature adjustment level 112 through the knob switch 101, the relay module 134 outputs the corresponding electrical signal, the current sensor 135 detects the signal, and the control unit 133 automatically adjusts the temperature threshold according to the signal to ensure that the freezer operates within the optimal temperature range, reduce energy consumption, improve refrigeration efficiency and extend the service life of the equipment.

[0089] As one implementation method, Figure 9 As shown, the freezer also includes a light switch module 141, a power adapter 142, and a light module 143 connected in sequence. The light switch module 141 is also connected to the power input terminal of the rotary switch 101. When the light switch module 141 is in the on state, the power adapter 142 is configured to convert the input power voltage to supply power to the light module 143.

[0090] The light switch module 141 serves as a user-controlled light switch, controlling the power supply status of the light module 143. The light switch module 141 is connected to the power input terminal of the rotary switch 101, ensuring that the lights can be independently switched on and off when the freezer is in operation. When the light switch module 141 is on, power voltage is allowed to enter the power adapter 142, starting the lighting system. The power adapter 142 provides the converted voltage to the light module 143, illuminating the lights. When the light switch module 141 is off, the input to the power adapter 142 is cut off, the light module 143 stops working, and the lights turn off. The power adapter 142 converts the input power voltage to a low-voltage DC voltage suitable for the operation of the light module 143, ensuring the stability and safety of the lighting system. When the light switch module 141 is on, the power adapter 142 receives power from the light switch module 141. It converts the voltage to a low-voltage output suitable for the light module 143 (e.g., 220V AC to 12V DC), providing a stable low-voltage power supply to the light module 143, illuminating the lights. When the light switch module 141 is disconnected, the power adapter 142 no longer receives voltage and stops working. The light module 143 receives no power input, and the light goes out. The light module 143 provides illumination inside the freezer, allowing users to easily view the items inside. It consists of light sources such as LEDs or fluorescent lamps, and its operating voltage is typically low (e.g., 12V DC). When the power adapter 142 provides low-voltage power, the light module 143 starts working, and the light illuminates; when the power adapter 142 stops supplying power, the light module 143 shuts down, and the light goes out.

[0091] The technical advantage of this embodiment is that, through the combination of the light switch module 141, the power adapter 142 and the light module 143, intelligent lighting control of the freezer is realized. Users can freely switch the lights on and off when the freezer is working. The power adapter 142 provides stable low-voltage power supply, ensuring a safe, energy-saving and efficient lighting experience.

[0092] As an example, such as Figure 10 and Figure 11 As shown, the L connector of plug T is connected to one end of light switch K3 and one end of rotary switch K1. The other end of rotary switch K1 is connected to one end of temperature switch K2 and the power input terminal of evaporator fan M4. The other end of temperature switch K2 is connected to the power input terminals of evaporator M1, compressor M2, and condenser fan M3. The grounding terminals of evaporator M1, compressor M2, condenser fan M3, and evaporator fan M4 are connected together to the N connector of socket T. The other end of light switch K3 is connected to the power input terminal of power adapter Q1. The output terminal of power adapter Q1 is connected to one end of lamp L2. The other end of lamp L2 is connected to one end of lamp L1. The other end of lamp L1 is connected to the input terminal of power adapter Q1. The grounding terminal of power adapter Q1 is connected to the N connector of socket T. Figure 11 As shown, the rotary switch K1 includes an off position 0 and temperature adjustment positions 1 to 8. The working process of this embodiment is as follows:

[0093] 1. When the knob arrow of rotary switch K1 is in the 0 position, rotary switch K1 is in the off state, and evaporator M1, compressor M2, condenser fan M3 and evaporator fan M4 are not working.

[0094] 2. When the knob arrow of rotary switch K1 is in a non-zero position, rotary switch K1 is in the closed state. After rotary switch K1 is turned on, power is supplied to temperature switch K2 through rotary switch K1. Temperature switch K2 controls the operation of evaporator M1, compressor M2, and condenser fan M3 according to temperature requirements. If the temperature does not reach the set value, temperature switch K2 opens, stopping the operation of evaporator M1, compressor M2, and condenser fan M3. If the temperature is higher than the set value, temperature switch K2 closes, starting evaporator M1, compressor M2, and condenser fan M3 to perform a refrigeration cycle. Evaporator fan M4 is directly powered by rotary switch K1. When rotary switch K1 is in any non-zero position, evaporator fan M4 will work to ensure cold air circulation.

[0095] 3. Settings 1-8: The temperature gradually decreases, and the operating time or intensity of the evaporator M1, compressor M2, and condenser fan M3 varies. Assuming the rotary switch K1 is set to setting 5, and the target temperature set by the temperature switch K2 is -5℃, with an ambient temperature of 1℃, when the temperature switch K2 is closed, the evaporator M1, compressor M2, and condenser fan M3 begin operating, and the evaporator fan M4 runs. When the temperature drops to -5℃, the temperature switch K2 opens, the evaporator M1, compressor M2, and condenser fan M3 stop operating, and the evaporator fan M4 continues to operate to maintain air circulation.

[0096] 4. Lighting circuit: When the light switch K3 is turned on, the power adapter Q1 is connected to the power supply, providing power to the lamps L1 and L2 to complete the lighting function.

[0097] Example 2

[0098] This second embodiment provides a freezer, including a thermostat, an evaporator, and an evaporation fan as described in the first embodiment.

[0099] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A thermostat for a refrigerator, characterized by The temperature controller has a first end, a second end and a third end; the first end of the temperature controller is used for electrically connecting a power supply; the second end of the temperature controller is used for electrically connecting an evaporator of the refrigerator; and the third end of the temperature controller is used for electrically connecting an evaporating fan of the refrigerator. The temperature controller has an operating component which can be switched by a user to a first gear and a second gear; in the first gear, the first end of the temperature controller is disconnected from the second end and the third end of the temperature controller respectively, so as to stop the evaporator and the evaporating fan from working; in the second gear, the first end of the temperature controller is connected to the second end and the third end of the temperature controller respectively, so as to make the evaporator and the evaporating fan work, or the first end of the temperature controller is connected to the second end, and the first end of the temperature controller is disconnected from the third end, so as to make the evaporating fan work while the evaporator stops working.

2. The temperature controller of claim 1, wherein The temperature controller comprises a knob switch and a temperature switch; the knob switch comprises a knob, a first end and a second end; the knob is used as the operating component; the first end of the knob switch leads out the first end of the temperature controller; and the second end of the knob switch leads out the third end of the temperature controller; the temperature switch comprises a first end and a second end; the first end of the temperature switch is connected to the second end of the knob switch; and the second end of the temperature switch leads out the second end of the temperature controller. In the case that the knob is rotated to the first gear, the first end and the second end of the knob switch are disconnected, so as to disconnect the first end of the temperature controller from the second end and the third end respectively. In the case that the knob is rotated to the second gear, the first end and the second end of the knob switch are connected, so as to connect the first end of the temperature controller to the third end; in the case that the temperature switch detects that the temperature of the refrigerator is greater than a temperature threshold, the first end and the second end of the temperature switch are connected, so as to connect the first end of the temperature controller to the second end; and in the case that the temperature switch detects that the temperature of the refrigerator is less than the temperature threshold, the first end and the second end of the temperature switch are disconnected, so as to disconnect the first end of the temperature controller from the second end.

3. The temperature controller of claim 2, wherein, The knob switch further comprises an off gear, at least one temperature adjustment gear and a temperature threshold setting module; the knob is provided with a fixed end and a switching end; the fixed end of the knob is the first end of the knob switch; the first end of the off gear and the first end of each temperature adjustment gear are connected together as the second end of the knob switch; the second end of each temperature adjustment gear is further connected to one end of the temperature threshold setting module; and the other end of the temperature threshold setting module is connected to the control end of the temperature switch. In the case that the rotation of the knob switches the switching end of the knob to be connected to the second end of the off gear, the knob is in the first gear. In the case that the rotation of the knob switches the switching end of the knob to be connected to the second end of any one of the temperature adjustment gears, the temperature threshold setting module sets the temperature threshold of the temperature switch, and the knob is in the second gear.

4. The temperature controller of claim 3, wherein The temperature switch comprises a first metal sheet and a second metal sheet, a first end of the first metal sheet leads out a first end of the temperature switch, a second end of the first metal sheet and a first end of the second metal sheet are arranged in parallel with a spacing, and a second end of the second metal sheet leads out a second end of the temperature switch; The temperature threshold setting module is connected to the first metal sheet or the second metal sheet, and when the knob switch is switched to the temperature adjustment gear, the spacing between the second end of the first metal sheet and the first end of the second metal sheet is adjusted by the temperature threshold setting module to adjust the temperature threshold of the temperature switch.

5. The temperature controller of claim 3, wherein The temperature switch comprises a control module, a switch module, and a temperature sensor, one end of the switch module is a first end of the temperature switch, the other end of the switch module is a second end of the temperature switch, a first input end of the control module is connected to a signal output end of the temperature threshold setting module, a second input end of the control module is connected to an output end of the temperature sensor, and an output end of the control module is connected to a control end of the switch module; The control module sets the temperature threshold according to the control signal output by the temperature threshold setting module, controls the switch module to be turned on when the temperature sensor detects that the temperature of the refrigerator is greater than the temperature threshold, and controls the switch module to be turned off when the temperature sensor detects that the temperature of the refrigerator is less than the temperature threshold.

6. The temperature controller of claim 5, wherein, The temperature threshold setting module is an elastic module, and when the knob switch is in the second gear, the elastic module sends an elastic signal corresponding to the current temperature adjustment gear to the control module.

7. The temperature controller of claim 6, wherein the temperature controller is configured to: The control module comprises a pressure sensor and a control unit, a detection end of the pressure sensor is a first input end of the control module, an output end of the pressure sensor is connected to a first signal input end of the control unit, a second signal input end of the control unit is a second input end of the control module, and an output end of the control unit is an output end of the control module; The pressure sensor outputs a detection signal to the control unit according to the elastic signal, and the control unit sets the temperature threshold according to the detection signal.

8. The temperature controller of claim 5, wherein, The temperature threshold setting module is a relay module, and when the knob switch is in the second gear, the relay module sends an electric signal corresponding to the current temperature adjustment gear to the control module.

9. The temperature controller of claim 8, wherein, The control module comprises a current sensor and a control unit, a detection end of the current sensor is a first input end of the control module, an output end of the current sensor is connected to a first signal input end of the control unit, a second signal input end of the control unit is a second signal input end of the control module, and an output end of the control unit is an output end of the control module; The current sensor outputs a detection signal to the control unit according to the electric signal, so that the control unit sets the temperature threshold according to the detection signal.

10. A refrigerator characterized by The temperature controller, the evaporator, and the evaporative air fan comprising the temperature controller according to any one of claims 1-9.

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