Sealed enclosure temperature control system and method

Abstract

The present application relates to the technical field of sealed enclosures, and provides a sealed enclosure temperature control system and a method. The sealed enclosure temperature control system comprises: a heat pump unit, a sealed enclosure, a first temperature sensor and a controller. The heat pump unit comprises, connected to form a cycle, a compressor, a condenser, an electronic expansion valve and an evaporator, the sealed enclosure being arranged on the evaporator side by side. The first temperature sensor is arranged in the sealed enclosure and is used for measuring the temperature in the sealed enclosure. The controller is separately electrically connected to the first temperature sensor, the compressor and the electronic expansion valve, and is used for controlling, during the cooling operation of the heat pump unit, the degree of opening of the electronic expansion valve according to the measured temperature in the sealed enclosure. The present application can use heat pump technology to accurately control internal temperatures of sealed enclosures, so as to quickly dissipate heat out of the sealed enclosures, thereby decreasing the internal temperatures of the sealed enclosures and ensuring the normal operation of electric devices in the sealed enclosures.

Description

Sealed box temperature control system and method

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 2023116990388, filed on December 12, 2023, entitled “Sealed Box Temperature Control System and Method,” which is incorporated herein by reference in its entirety. Technical Field

[0003] The present application relates to the technical field of sealed boxes, and in particular to a sealed box temperature control system and method. Background Art

[0004] In related technologies, electrical components are housed within a sealed enclosure. This seal effectively prevents water and dust from entering, preventing damage to the components. However, during use, because the enclosure is sealed, heat generated by the electrical components can accumulate within the enclosure, causing the temperature inside to overheat. This can easily damage the components over time, and in severe cases, even cause explosions.

[0005] Therefore, there is an urgent need for a device that can dissipate the heat inside the sealed box.

[0006] Summary of the Invention

[0007] The present application provides a sealed box temperature control system and method to solve the defect in the related art that the temperature inside the sealed box is too high, causing damage to electrical components or even explosion. Heat pump technology can be used to achieve precise control of the temperature inside the sealed box, thereby quickly dissipating the heat inside the sealed box, reducing the temperature inside the sealed box, and ensuring the normal operation of the electrical components in the sealed box. It has the characteristics of simple structure, stability and reliability.

[0008] The present application provides a sealed box temperature control system, comprising:

[0009] Heat pump unit, including a compressor, condenser, electronic expansion valve and evaporator connected in a loop;

[0010] A sealed box body is arranged side by side with the evaporator;

[0011] a first temperature sensor, disposed in the sealed box, for detecting the temperature inside the sealed box;

[0012] The controller is electrically connected to the first temperature sensor, the compressor and the electronic expansion valve respectively, and is used to control the opening of the electronic expansion valve according to the detected temperature in the sealed box when the heat pump unit is in cooling operation.

[0013] The sealed box temperature control system provided by the present application can realize refrigeration operation by a heat pump unit including a compressor, a condenser, an electronic expansion valve and an evaporator connected in a loop, so that the evaporator can absorb heat and reduce the ambient temperature; the sealed box is arranged side by side with the evaporator, and the evaporator can absorb the heat of the sealed box, thereby reducing the temperature in the sealed box; the first temperature sensor is arranged in the sealed box, and the temperature in the sealed box can be detected in real time; the controller is electrically connected to the first temperature sensor, the compressor and the electronic expansion valve respectively, and is used to control the opening of the electronic expansion valve according to the detected temperature in the sealed box when the heat pump unit is in refrigeration operation, thereby controlling the temperature in the sealed box and achieving the purpose of reducing the temperature inside the sealed box. Therefore, the present application can use heat pump technology to achieve precise control of the temperature inside the sealed box by cleverly combining the heat pump unit with the sealed box, thereby quickly dissipating the heat in the sealed box, reducing the temperature in the sealed box, and ensuring the normal operation of the electrical components in the sealed box, and has the characteristics of simple structure, stability and reliability.

[0014] According to a sealed box temperature control system provided by the present application, the heat pump unit further includes:

[0015] The fan is arranged side by side with the evaporator and is electrically connected to the controller. The controller is also used to control the speed of the fan according to the detected temperature in the sealed box when the heat pump unit is in cooling operation.

[0016] The sealed box temperature control system provided in the present application realizes the coordinated control of the electronic expansion valve and the fan. Driven by the fan, the air temperature of the air passing through the evaporator is further reduced. The air passes through the sealed box, exchanges heat with the sealed box, and takes away the heat of the sealed box. Moreover, according to the temperature inside the sealed box, the fan speed can be further increased to increase the air volume passing through the sealed box itself, thereby increasing the heat dissipation of the sealed box and effectively reducing the temperature inside the sealed box, thereby ensuring the normal operation of the electrical components in the sealed box, preventing explosion, and effectively improving safety and reliability.

[0017] According to a sealed box temperature control system provided by the present application, the evaporator is provided with a second temperature sensor, and the second temperature sensor is electrically connected to the controller for detecting the temperature of the evaporator.

[0018] According to a sealed box temperature control system provided by the present application, a liquid storage tank is provided between the condenser and the electronic expansion valve.

[0019] The present application sets a liquid storage tank between the condenser and the electronic expansion valve to store high-pressure liquid from the condenser, so that the liquid does not submerge the surface of the condenser, the heat transfer area of ​​the condenser can be fully utilized, and the circulation of the refrigerant can be adjusted and stabilized to adapt to changes in working conditions. In addition, it can also act as a liquid seal to prevent high-pressure refrigerant gas from entering the compressor and causing liquid hammer, thereby achieving the purpose of protecting the compressor.

[0020] According to a sealed box temperature control system provided by the present application, a filter is provided between the liquid storage tank and the electronic expansion valve.

[0021] This application sets a filter between the liquid storage tank and the electronic expansion valve to filter the refrigerant impurities in the pipeline, avoid clogging the electronic expansion valve, thereby ensuring the normal operation of the heat pump unit, and ensuring the control accuracy of the electronic expansion valve, thereby achieving precise control of the sealed box temperature.

[0022] According to a sealed box temperature control system provided by the present application, the condenser is cyclically connected to the cooling water supply device via a circulating water circuit.

[0023] The present application connects the condenser to the cooling water supply device through a circulating water circuit, and can use the heat released by the condenser to heat the cooling water supplied by the cooling water supply device to obtain hot water, thereby achieving full recycling of system energy and improving the energy utilization rate of the system.

[0024] The present application also provides a control method for the above-mentioned sealed box temperature control system, comprising:

[0025] When the heat pump unit is in cooling operation, detecting the temperature inside the sealed box;

[0026] The opening of the electronic expansion valve is controlled according to the detected temperature inside the sealed box.

[0027] The control method of the sealed box temperature control system provided in the present application detects the temperature inside the sealed box when the heat pump unit is in cooling operation, and controls the opening of the electronic expansion valve according to the detected temperature inside the sealed box, thereby adjusting the refrigerant flow rate and thus adjusting the temperature of the evaporator, thereby reducing the temperature of the air passing through the evaporator, reducing the ambient temperature around the sealed box, increasing the heat exchange of the sealed box, and reducing the temperature inside the sealed box.

[0028] According to a control method for a sealed box temperature control system provided by the present application, the step of controlling the opening of the electronic expansion valve according to the detected temperature inside the sealed box includes:

[0029] Determining that the temperature inside the sealed box is greater than a target set value, and reducing the opening of the electronic expansion valve;

[0030] Determine that the temperature in the sealed box is less than or equal to a target set value, and control the opening of the electronic expansion valve to remain unchanged.

[0031] When the temperature inside the sealed box is greater than the safe target setting value, it means there is a safety hazard. At this time, reduce the opening of the electronic expansion valve, reduce the refrigerant flow, lower the temperature of the evaporator, and lower the temperature of the air passing through the evaporator. The air passes through the sealed box, exchanges heat with the sealed box, takes away the heat of the sealed box, and achieves the purpose of lowering the temperature inside the sealed box; when the temperature inside the sealed box is less than or equal to the safe target setting value, it means there is no safety hazard. At this time, keep the current opening of the electronic expansion valve unchanged to ensure the current temperature of the evaporator, thereby ensuring the normal operation of the heat pump unit.

[0032] According to a control method of a sealed box temperature control system provided by the present application, when the heat pump unit is in cooling operation, the method further includes:

[0033] The rotation speed of the fan arranged side by side with the evaporator is controlled according to the detected temperature in the sealed box.

[0034] The control method of the sealed box temperature control system provided in the present application coordinates the control of the electronic expansion valve and the fan. Driven by the fan, the air temperature of the air passing through the evaporator is further reduced. The air passes through the sealed box, exchanges heat with the sealed box, takes away the heat of the sealed box, and effectively reduces the temperature inside the sealed box.

[0035] According to a control method for a sealed box temperature control system provided by the present application, the step of controlling the rotation speed of a fan arranged side by side with the evaporator according to the detected temperature inside the sealed box includes:

[0036] Determining that the temperature inside the sealed box is greater than a target set value, and increasing the speed of the fan;

[0037] Determine that the temperature inside the sealed box is less than or equal to a target set value, and control the speed of the fan to remain unchanged.

[0038] When the temperature inside the sealed box is greater than the target set value, it indicates that there is a safety hazard. At this time, the fan speed can be increased to increase the air volume passing through the sealed box itself, thereby increasing the heat dissipation of the sealed box and effectively reducing the temperature inside the sealed box, thereby ensuring the normal operation of the electrical components in the sealed box, preventing explosions, and effectively improving safety and reliability; when the temperature inside the sealed box is less than or equal to the safe target set value, it indicates that there is no safety hazard. At this time, the fan speed is kept unchanged to ensure the normal operation of the heat pump unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in this application or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0040] FIG1 is a schematic structural diagram of a sealed box temperature control system provided by the present application;

[0041] FIG2 is one of the assembly diagrams of the sealed box provided in the present application;

[0042] FIG3 is a second schematic diagram of the assembly of the sealed box provided in the present application;

[0043] FIG4 is a flow chart of one of the control methods of the sealed box temperature control system provided by the present application;

[0044] FIG5 is a second flow chart of a control method for a sealed box temperature control system provided by the present application;

[0045] FIG6 is a third flow chart of the control method of the sealed box temperature control system provided by the present application;

[0046] FIG7 is a fourth flow chart of the control method of the sealed box temperature control system provided by the present application;

[0047] FIG8 is a fifth flow chart of the control method of the sealed box temperature control system provided in the present application.

[0048] Reference numerals: 1: sealed box; 2: first temperature sensor; 3: compressor; 4: condenser; 5: electronic expansion valve; 6: evaporator; 7: fan; 8: second temperature sensor; 9: liquid storage tank; 10: filter; 11: cooling water supply device. DETAILED DESCRIPTION

[0049] To make the objectives, technical solutions, and advantages of this application more clear, the technical solutions of this application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0050] In the description of the embodiments of the present application, it should be noted that the terms "top," "bottom," "inner," "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of the embodiments of the present application and to simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0051] In the description of the embodiments of this application, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of this application based on the specific circumstances.

[0052] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0053] The sealed box temperature control system and method of the present application will be described below with reference to FIG. 1 to FIG. 8 .

[0054] According to the embodiment of the first aspect of the present application, referring to Figures 1 to 3, the sealed box temperature control system provided by the present application mainly includes: a heat pump unit, a sealed box 1, a first temperature sensor 2 and a controller and other components.

[0055] The heat pump unit includes a compressor 3, a condenser 4, an electronic expansion valve 5 and an evaporator 6 which are connected in a loop via a refrigerant circulation pipeline. During refrigeration operation, the high-temperature and high-pressure gaseous refrigerant generated by the compressor 3 enters the condenser 4 to condense and release heat, is then throttled by the electronic expansion valve 5, evaporates in the evaporator 6 to absorb heat, and finally flows back to the compressor 3.

[0056] The sealed box body 1 is arranged side by side with the evaporator 6 , for example, in front of the evaporator 6 . The evaporator 6 can absorb the heat of the sealed box body 1 , thereby reducing the temperature inside the sealed box body 1 .

[0057] The first temperature sensor 2 is disposed in the sealed box 1 and is used to detect the temperature in the sealed box 1 .

[0058] The controller is electrically connected to the first temperature sensor 2, the compressor 3 and the electronic expansion valve 5 respectively, and is used to control the opening of the electronic expansion valve 5 according to the detected temperature in the sealed box 1 when the heat pump unit is in cooling operation.

[0059] Specifically, when the temperature inside the sealed box 1 is greater than the safe target setting value, it indicates that there is a safety hazard. At this time, the opening of the electronic expansion valve 5 is reduced, the refrigerant flow is reduced, and the temperature of the evaporator 6 is lowered, so that the temperature of the air passing through the evaporator 6 is reduced. The air passes through the sealed box 1, exchanges heat with the sealed box 1, and takes away the heat of the sealed box 1, thereby achieving the purpose of lowering the internal temperature of the sealed box 1; when the temperature inside the sealed box 1 is less than or equal to the safe target setting value, it indicates that there is no safety hazard. At this time, the current opening of the electronic expansion valve 5 is kept unchanged to ensure the current temperature of the evaporator 6, thereby ensuring the normal operation of the heat pump unit.

[0060] The sealed box temperature control system provided in the embodiment of the present application can realize cooling operation through the heat pump unit, so that the evaporator 6 absorbs heat and reduces the ambient temperature; the sealed box 1 is arranged side by side with the evaporator 6, and the evaporator 6 can absorb the heat of the sealed box 1, thereby reducing the temperature inside the sealed box 1; the first temperature sensor 2 is arranged in the sealed box 1, and the temperature inside the sealed box 1 can be detected in real time; the controller is electrically connected to the first temperature sensor 2, the compressor 3 and the electronic expansion valve 5 respectively, and is used to control the opening of the electronic expansion valve 5 according to the detected temperature inside the sealed box 1 when the heat pump unit is in cooling operation, thereby controlling the temperature inside the sealed box 1 and achieving the purpose of reducing the internal temperature of the sealed box 1.

[0061] Therefore, the present application cleverly combines the heat pump unit with the sealed box 1, and can use heat pump technology to achieve precise control of the internal temperature of the sealed box 1, thereby quickly dissipating the heat in the sealed box 1, reducing the temperature inside the sealed box 1, and ensuring the normal operation of the electrical components in the sealed box 1. It also has the characteristics of simple structure, stability and reliability.

[0062] According to one embodiment of the present application, as shown in Figures 1 and 2, the heat pump unit also includes: a fan 7, which is arranged side by side with the evaporator 6 and is electrically connected to the controller. The controller is also used to control the speed of the fan 7 according to the detected temperature inside the sealed box 1 when the heat pump unit is in cooling operation. When the fan 7 is running, the outdoor air passes through the evaporator 6 and blows toward the sealed box 1, quickly taking away the heat generated by the sealed box 1, thereby reducing the temperature inside the sealed box 1.

[0063] Specifically, when the temperature inside the sealed box 1 is greater than the target setting value, the speed of the fan 7 can be increased to increase the air volume passing through the sealed box 1 itself, thereby increasing the heat dissipation of the sealed box 1 and quickly reducing the temperature inside the sealed box 1, thereby ensuring the normal operation of the electrical components in the sealed box 1, preventing explosion, and effectively improving safety and reliability; when the temperature inside the sealed box 1 is less than or equal to the safe target setting value, the speed of the fan 7 is kept unchanged to ensure the normal operation of the heat pump unit.

[0064] The sealed box temperature control system provided in the embodiment of the present application coordinates the control of the electronic expansion valve 5 and the fan 7. Driven by the fan 7, the air temperature is further reduced when passing through the evaporator 6. The air passes through the sealed box 1 and exchanges heat with the sealed box 1, quickly taking away the heat of the sealed box 1, effectively reducing the temperature inside the sealed box 1, thereby ensuring the normal operation of the electrical components in the sealed box 1, preventing explosion, and effectively improving safety and reliability.

[0065] According to one embodiment of the present application, the evaporator 6 is provided with a second temperature sensor 8 , which is electrically connected to the controller and is used to detect the temperature of the evaporator 6 .

[0066] According to one embodiment of the present application, as shown in FIG. 1 , a liquid storage tank 9 is provided between the condenser 4 and the electronic expansion valve 5 .

[0067] The embodiment of the present application sets a liquid storage tank 9 between the condenser 4 and the electronic expansion valve 5 to store high-pressure liquid from the condenser 4, so that the liquid does not submerge the surface of the condenser 4, so that the heat transfer area of ​​the condenser 4 can be fully utilized, and the circulation of the refrigerant can be adjusted and stabilized to adapt to changes in working conditions. In addition, it can also play the role of liquid seal to prevent high-pressure refrigerant gas from entering the compressor 3 to cause liquid hammer, thereby achieving the purpose of protecting the compressor 3.

[0068] According to one embodiment of the present application, a filter 10 is provided between the liquid storage tank 9 and the electronic expansion valve 5 .

[0069] The embodiment of the present application sets a filter 10 between the liquid storage tank 9 and the electronic expansion valve 5 to filter the refrigerant impurities in the pipeline, avoid clogging the electronic expansion valve 5, thereby ensuring the normal operation of the heat pump unit, and ensuring the control accuracy of the electronic expansion valve 5, thereby achieving precise control of the temperature of the sealed box 1.

[0070] According to one embodiment of the present application, the condenser 4 is cyclically connected to the cooling water supply device 11 via a circulating water circuit.

[0071] The embodiment of the present application connects the condenser 4 to the cooling water supply device 11 through a circulating water circuit, and can use the heat released by the condenser 4 to heat the cooling water supplied by the cooling water supply device 11, thereby obtaining hot water, thereby achieving full recycling of system energy and improving the energy utilization rate of the system.

[0072] According to an embodiment of the present application, the sealed box body 1 of the present application can be made of heat dissipation material, thereby further improving the heat dissipation effect of the sealed box body 1.

[0073] The control method of the sealed box temperature control system provided in the present application is described below. The control method of the sealed box temperature control system described below and the sealed box temperature control system described above can be referenced to each other.

[0074] According to an embodiment of the second aspect of the present application, as shown in FIG4 , the present application further provides a control method for the sealed box temperature control system of the above embodiment, which mainly includes the following steps.

[0075] S100 , when the heat pump unit is in cooling operation, detecting the temperature inside the sealed box 1 .

[0076] S200 , controlling the opening of the electronic expansion valve 5 according to the detected temperature inside the sealed box 1 .

[0077] The control method of the sealed box temperature control system provided in the embodiment of the present application detects the temperature inside the sealed box 1 when the heat pump unit is in cooling operation, and controls the opening of the electronic expansion valve 5 according to the detected temperature inside the sealed box 1, thereby adjusting the refrigerant flow rate and thus adjusting the temperature of the evaporator 6, so as to reduce the temperature of the air passing through the evaporator 6, reduce the ambient temperature around the sealed box 1, increase the heat exchange capacity of the sealed box 1, and reduce the internal temperature of the sealed box 1.

[0078] According to one embodiment of the present application, the step of controlling the opening of the electronic expansion valve 5 according to the detected temperature inside the sealed box 1 includes:

[0079] Determine that the temperature in the sealed box 1 is greater than the target setting value, and reduce the opening of the electronic expansion valve 5;

[0080] It is determined that the temperature in the sealed box 1 is less than or equal to the target set value, and the opening of the electronic expansion valve 5 is controlled to remain unchanged.

[0081] When the temperature inside the sealed box 1 is greater than the safe target setting value, it indicates that there is a safety hazard. At this time, the opening of the electronic expansion valve 5 is reduced, the refrigerant flow is reduced, and the temperature of the evaporator 6 is lowered, so that the temperature of the air passing through the evaporator 6 is reduced. The air passes through the sealed box 1, exchanges heat with the sealed box 1, and takes away the heat of the sealed box 1, thereby achieving the purpose of lowering the internal temperature of the sealed box 1; when the temperature inside the sealed box 1 is less than or equal to the safe target setting value, it indicates that there is no safety hazard. At this time, the current opening of the electronic expansion valve 5 is kept unchanged to ensure the current temperature of the evaporator 6, thereby ensuring the normal operation of the heat pump unit.

[0082] According to one embodiment of the present application, as shown in FIG5 , when the heat pump unit is in cooling operation, the following steps are further included:

[0083] S300 , controlling the rotation speed of the fan 7 arranged side by side with the evaporator 6 according to the detected temperature inside the sealed box 1 .

[0084] The control method of the sealed box temperature control system provided in the embodiment of the present application coordinates the control of the electronic expansion valve 5 and the fan 7. Driven by the fan 7, the air temperature is further reduced through the evaporator 6. The air passes through the sealed box 1 and exchanges heat with the sealed box 1, quickly taking away the heat of the sealed box 1, and effectively reducing the internal temperature of the sealed box 1.

[0085] According to one embodiment of the present application, the step of controlling the rotation speed of the fan 7 arranged side by side with the evaporator 6 according to the detected temperature inside the sealed box 1 includes:

[0086] Determine that the temperature in the sealed box 1 is greater than the target setting value, and increase the speed of the fan 7;

[0087] Determine that the temperature in the sealed box 1 is less than or equal to the target set value, and control the speed of the fan 7 to remain unchanged.

[0088] When the temperature inside the sealed box 1 is greater than the target setting value, it indicates that there is a safety hazard. At this time, the speed of the fan 7 can be increased to increase the air volume passing through the sealed box 1 itself, thereby increasing the heat dissipation of the sealed box 1 and quickly reducing the temperature inside the sealed box 1, thereby ensuring the normal operation of the electrical components in the sealed box 1, preventing explosion, and effectively improving safety and reliability; when the temperature inside the sealed box 1 is less than or equal to the safe target setting value, it indicates that there is no safety hazard. At this time, the speed of the fan 7 is kept unchanged to ensure the normal operation of the heat pump unit.

[0089] The control method of the sealed box temperature control system provided by the present application is further described below with reference to specific examples.

[0090] In a specific example, as shown in FIG6 , the control method of the sealed box temperature control system provided in the present application mainly includes the following steps.

[0091] (1) Refrigeration operation of the heat pump unit.

[0092] (2) Detect the temperature Tao inside the sealed box 1.

[0093] (3) Compare the detected temperature Tao inside the sealed box 1 with the target setting value Tax to determine whether the temperature Tao inside the sealed box 1 is greater than the target setting value Tax.

[0094] (4) If Tao>Tax, then reduce the opening of the electronic expansion valve 5, reduce the refrigerant flow, lower the temperature of the evaporator 6, and lower the temperature of the air passing through the evaporator 6. The air passes through the sealed box 1, exchanges heat with the sealed box 1, and takes away the heat of the sealed box 1, thereby achieving the purpose of lowering the internal temperature of the sealed box 1.

[0095] (5) If Tao≤Tax, the current opening of the electronic expansion valve 5 is kept unchanged to ensure the current temperature of the evaporator 6, thereby ensuring the normal operation of the heat pump unit.

[0096] In a specific example, as shown in FIG7 , the control method of the sealed box temperature control system provided in the present application mainly includes the following steps.

[0097] (1) Refrigeration operation of the heat pump unit.

[0098] (2) Detect the temperature Tao inside the sealed box 1.

[0099] (3) Compare the detected temperature Tao inside the sealed box 1 with the target setting value Tax to determine whether the temperature Tao inside the sealed box 1 is greater than the target setting value Tax.

[0100] (4) If Tao>Tax, then the speed of the fan 7 is increased to increase the air volume passing through the sealed box 1 itself, thereby increasing the heat dissipation of the sealed box 1 and effectively reducing the temperature inside the sealed box 1.

[0101] (5) If Tao≤Tax, the speed of the fan 7 is kept unchanged to ensure the normal operation of the heat pump unit.

[0102] In a specific example, as shown in FIG8 , the control method of the sealed box temperature control system provided in the present application mainly includes the following steps.

[0103] (1) Refrigeration operation of the heat pump unit.

[0104] (2) Detect the temperature Tao inside the sealed box 1.

[0105] (3) Compare the detected temperature Tao inside the sealed box 1 with the target setting value Tax to determine whether the temperature Tao inside the sealed box 1 is greater than the target setting value Tax.

[0106] (4) If Tao>Tax, the opening of the electronic expansion valve 5 is reduced and the speed of the fan 7 is increased. Driven by the fan 7, the air temperature of the air passing through the evaporator 6 is rapidly reduced. The air passes through the sealed box 1 and exchanges heat with the sealed box 1, quickly taking away the heat of the sealed box 1, and effectively reducing the internal temperature of the sealed box 1.

[0107] (5) If Tao≤Tax, the current opening of the electronic expansion valve 5 and the speed of the fan 7 are kept unchanged to ensure the current temperature of the evaporator 6, thereby ensuring the normal operation of the heat pump unit.

[0108] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A sealed box temperature control system, comprising: A heat pump unit, including a compressor, a condenser, an electronic expansion valve and an evaporator connected in a loop; A sealed box body, arranged side by side with the evaporator; A first temperature sensor is disposed in the sealed box and is used to detect the temperature in the sealed box; The controller is electrically connected to the first temperature sensor, the compressor and the electronic expansion valve respectively, and is used to control the opening of the electronic expansion valve according to the detected temperature in the sealed box when the heat pump unit is in refrigeration operation.

2. The sealed box temperature control system according to claim 1, wherein: The heat pump unit also includes: The fan is arranged side by side with the evaporator and is electrically connected to the controller. The controller is also used to control the speed of the fan according to the detected temperature in the sealed box when the heat pump unit is in refrigeration operation.

3. The sealed box temperature control system according to claim 1, wherein: The evaporator is provided with a second temperature sensor, which is electrically connected to the controller and is used to detect the temperature of the evaporator.

4. The sealed box temperature control system according to claim 1, wherein: A liquid storage tank is provided between the condenser and the electronic expansion valve.

5. The sealed box temperature control system according to claim 4, wherein: A filter is provided between the liquid storage tank and the electronic expansion valve.

6. The sealed box temperature control system according to any one of claims 1 to 5, wherein: The condenser is cyclically connected to a cooling water supply device via a circulating water circuit.

7. A method for controlling a sealed box temperature control system according to any one of claims 1 to 6, comprising: When the heat pump unit is in refrigeration operation, detecting the temperature inside the sealed box; The opening of the electronic expansion valve is controlled according to the detected temperature in the sealed box.

8. The control method of the sealed box temperature control system according to claim 7, wherein: The step of controlling the opening of the electronic expansion valve according to the detected temperature in the sealed box includes: Determining that the temperature in the sealed box is greater than a target setting value, and reducing the opening of the electronic expansion valve; Determine that the temperature in the sealed box is less than or equal to a target setting value, and control the opening of the electronic expansion valve to remain unchanged.

9. The control method of the sealed box temperature control system according to claim 7, wherein: When the heat pump unit is in cooling operation, the method further comprises: The rotation speed of the fan arranged in parallel with the evaporator is controlled according to the detected temperature in the sealed box.

10. The control method of the sealed box temperature control system according to claim 9, wherein: The step of controlling the rotation speed of the fan arranged in parallel with the evaporator according to the detected temperature in the sealed box includes: Determining that the temperature in the sealed box is greater than a target setting value, increasing the speed of the fan; Determine that the temperature in the sealed box is less than or equal to a target setting value, and control the speed of the fan to remain unchanged.

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