Sealed box body temperature control system and method

Abstract

The invention relates to the technical field of sealed box bodies, and provides a sealed box body temperature control system and method.The sealed box body temperature control system comprises a heat pump unit, a sealed box body, a first temperature sensor and a controller, and the heat pump unit comprises a compressor, a condenser, an electronic expansion valve and an evaporator which are circularly connected; the sealing box bodies are arranged on the evaporator side by side. The first temperature sensor is arranged in the sealed box body and is used for detecting the temperature in the sealed box body; the controller is electrically connected with the first temperature sensor, the compressor and the electronic expansion valve and used for controlling the opening degree of the electronic expansion valve according to the detected temperature in the sealed box body under the condition that the heat pump unit operates in a refrigeration mode. The internal temperature of the sealed box body can be accurately controlled by utilizing a heat pump technology, so that heat in the sealed box body is quickly dissipated, the temperature in the sealed box body is reduced, and normal operation of electric parts in the sealed box body is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of sealed boxes, and in particular to a temperature control system and method for a sealed box. Background Art

[0002] In the related art, electrical components are arranged inside a sealed box. By sealing the box, it can effectively prevent water and dust from entering and prevent the electrical components from being damaged. However, during use, due to the sealing of the box, the heat generated by the electrical components will accumulate inside the sealed box, causing the temperature inside the sealed box to be too high. After a long time, it is easy to cause damage to the electrical components, and in severe cases, even an explosion may occur.

[0003] Therefore, there is an urgent need for a device that can dissipate the heat inside the sealed box. Summary of the Invention

[0004] The present invention provides a temperature control system and method for a sealed box, which are used to solve the defect that the temperature inside the sealed box is too high in the related art, resulting in damage to electrical components or even explosion. The precise control of the temperature inside the sealed box can be achieved by using heat pump technology, so as to quickly dissipate the heat inside the sealed box, reduce the temperature inside the sealed box, ensure the normal operation of the electrical components inside the sealed box, and has the characteristics of simple structure, stable and reliable.

[0005] The present invention provides a temperature control system for a sealed box, including:

[0006] A heat pump unit, including a compressor, a condenser, an electronic expansion valve, and an evaporator connected in a cycle;

[0007] A sealed box, arranged side by side with the evaporator;

[0008] A first temperature sensor, arranged inside the sealed box, for detecting the temperature inside the sealed box;

[0009] A controller, electrically connected to the first temperature sensor, the compressor, and the electronic expansion valve respectively, and used to control the opening degree of the electronic expansion valve according to the detected temperature inside the sealed box when the heat pump unit operates in a refrigeration mode.

[0010] The temperature control system for a sealed box provided by the present invention includes a heat pump unit which is connected in a cycle with a compressor, a condenser, an electronic expansion valve and an evaporator, and can realize refrigeration operation, enabling the evaporator to absorb heat and reduce the surrounding environmental 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 inside the sealed box; a first temperature sensor is arranged inside the sealed box to detect the temperature inside the sealed box in real time; the controller is electrically connected to the first temperature sensor, the compressor and the electronic expansion valve respectively, and is used for controlling the opening degree of the electronic expansion valve according to the detected temperature inside the sealed box in the case of the refrigeration operation of the heat pump unit, thereby controlling the temperature inside the sealed box and achieving the purpose of reducing the temperature inside the sealed box. Therefore, by skillfully combining the heat pump unit with the sealed box, the present invention can utilize the heat pump technology to accurately control the temperature inside the sealed box, thereby quickly dissipating the heat inside the sealed box, reducing the temperature inside the sealed box, ensuring the normal operation of the electrical components inside the sealed box, and having the characteristics of simple structure, stability and reliability.

[0011] According to a temperature control system for a sealed box provided by the present invention, the heat pump unit further includes:

[0012] A fan, arranged side by side with the evaporator and electrically connected to the controller, and the controller is further used for controlling the rotation speed of the fan according to the detected temperature inside the sealed box in the case of the refrigeration operation of the heat pump unit.

[0013] In the temperature control system for a sealed box provided by the present invention, by coordinately controlling the electronic expansion valve and the fan, the air is further cooled by the evaporator under the drive of the fan, and the air passes through the sealed box and exchanges heat with the sealed box to take away the heat of the sealed box; and the rotation speed of the fan can be further increased according to the temperature inside the sealed box to increase the air volume passing through the sealed box itself, thereby increasing the heat dissipation of the sealed box, effectively reducing the temperature inside the sealed box, ensuring the normal operation of the electrical components inside the sealed box, preventing explosion, and effectively improving the safety and reliability.

[0014] According to a temperature control system for a sealed box provided by the present invention, 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.

[0015] According to a temperature control system for a sealed box provided by the present invention, a liquid storage tank is arranged between the condenser and the electronic expansion valve.

[0016] By arranging a liquid storage tank between the condenser and the electronic expansion valve, the present invention can store the high-pressure liquid from the condenser, preventing the liquid from flooding the surface of the condenser, enabling the heat transfer area of the condenser to fully play its role, regulating and stabilizing the refrigerant cycle to adapt to the change of working conditions, and also playing a role in liquid sealing to prevent high-pressure refrigerant gas from entering the compressor to cause liquid hammer, thereby achieving the purpose of protecting the compressor.

[0017] According to a temperature control system for a sealed box body provided by the present invention, a filter is arranged between the liquid storage tank and the electronic expansion valve.

[0018] By arranging a filter between the liquid storage tank and the electronic expansion valve, the present invention can filter the refrigerant impurities in the pipeline, avoid clogging the electronic expansion valve, thus ensuring the normal operation of the heat pump unit, and ensuring the control accuracy of the electronic expansion valve to achieve precise control of the temperature of the sealed box body.

[0019] According to a temperature control system for a sealed box body provided by the present invention, the condenser is circularly connected to a cooling water supply device through a circulating water path.

[0020] By circularly connecting the condenser to the cooling water supply device through the circulating water path, the present invention can heat the cooling water supplied by the cooling water supply device by using the heat released by the condenser, thereby obtaining hot water, realizing the full recovery and utilization of the system energy, and improving the energy utilization rate of the system.

[0021] The present invention also provides a control method for the above-mentioned temperature control system of the sealed box body, including:

[0022] When the heat pump unit operates in refrigeration mode, detecting the temperature inside the sealed box body;

[0023] Controlling the opening degree of the electronic expansion valve according to the detected temperature inside the sealed box body.

[0024] The control method for the temperature control system of the sealed box body provided by the present invention, by detecting the temperature inside the sealed box body when the heat pump unit operates in refrigeration mode, and controlling the opening degree of the electronic expansion valve according to the detected temperature inside the sealed box body, can adjust the refrigerant flow rate, thereby adjusting the temperature of the evaporator, reducing the temperature of the air passing through the evaporator, lowering the environmental temperature around the sealed box body, increasing the heat exchange amount of the sealed box body, and reducing the internal temperature of the sealed box body.

[0025] According to a control method for a temperature control system of a sealed box body provided by the present invention, the step of controlling the opening degree of the electronic expansion valve according to the detected temperature inside the sealed box body includes:

[0026] Determining that the temperature inside the sealed box body is greater than the target set value, and reducing the opening degree of the electronic expansion valve;

[0027] Determine that the temperature inside the sealed box is less than or equal to the target set value, and keep the opening degree of the electronic expansion valve unchanged.

[0028] When the temperature inside the sealed box is greater than the safe target set value, it indicates a potential safety hazard. At this time, reduce the opening degree of the electronic expansion valve, reduce the refrigerant flow rate, lower the temperature of the evaporator, so that the temperature of the air passing through the evaporator decreases. The air passes through the sealed box and exchanges heat with the sealed box, taking away the heat of the sealed box, achieving the purpose of reducing the internal temperature of the sealed box; when the temperature inside the sealed box is less than or equal to the safe target set value, it indicates no potential safety hazard. At this time, keep the current opening degree of the electronic expansion valve unchanged to ensure the current temperature of the evaporator, thereby ensuring the normal operation of the heat pump unit.

[0029] According to a control method of a temperature control system for a sealed box provided by the present invention, in the case of the refrigeration operation of the heat pump unit, it further includes:

[0030] Control the rotation speed of the fans arranged side by side on the evaporator according to the detected temperature inside the sealed box.

[0031] The control method of the temperature control system for the sealed box provided by the present invention, through the coordinated control of the electronic expansion valve and the fans, the temperature of the air passing through the evaporator is further reduced under the drive of the fans. The air passes through the sealed box and exchanges heat with the sealed box, taking away the heat of the sealed box, effectively reducing the internal temperature of the sealed box.

[0032] According to a control method of a temperature control system for a sealed box provided by the present invention, the step of controlling the rotation speed of the fans arranged side by side on the evaporator according to the detected temperature inside the sealed box includes:

[0033] Determine that the temperature inside the sealed box is greater than the target set value, and increase the rotation speed of the fans;

[0034] Determine that the temperature inside the sealed box is less than or equal to the target set value, and keep the rotation speed of the fans unchanged.

[0035] When the temperature inside the sealed box is greater than the target set value, it indicates a potential safety hazard. At this time, the rotation speed of the fans can be increased to increase the air volume passing through the sealed box itself, thereby increasing the heat dissipation of the sealed box, effectively reducing the internal temperature of the sealed box, ensuring the normal operation of the electrical components inside the sealed box, preventing explosion, 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 no potential safety hazard. At this time, keep the rotation speed of the fans unchanged, thereby ensuring the normal operation of the heat pump unit. Description of the Drawings

[0036] To more clearly illustrate the technical solutions in the present invention or related technologies, the following will briefly introduce the drawings required for use in the description of the embodiments or related technologies. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0037] Figure 1 is a schematic structural diagram of the sealed box temperature control system provided by the present invention;

[0038] Figure 2 is one of the assembly schematic diagrams of the sealed box provided by the present invention;

[0039] Figure 3 is another assembly schematic diagram of the sealed box provided by the present invention;

[0040] Figure 4 is one of the flow schematic diagrams of the control method of the sealed box temperature control system provided by the present invention;

[0041] Figure 5 is another flow schematic diagram of the control method of the sealed box temperature control system provided by the present invention;

[0042] Figure 6 is a third flow schematic diagram of the control method of the sealed box temperature control system provided by the present invention;

[0043] Figure 7 is a fourth flow schematic diagram of the control method of the sealed box temperature control system provided by the present invention;

[0044] Figure 8 is a fifth flow schematic diagram of the control method of the sealed box temperature control system provided by the present invention.

[0045] Reference numerals:

[0046] 1: Sealed box; 2: First temperature sensor; 3: Compressor; 4: Condenser;

[0047] 5: Electronic expansion valve; 6: Evaporator; 7: Fan; 8: Second temperature sensor;

[0048] 9: Liquid storage tank; 10: Filter; 11: Cooling water supply device. Detailed implementation manners

[0049] To make the objectives, technical solutions and advantages of the present invention more clear, the following will, in conjunction with the accompanying drawings in the present invention, clearly and completely describe the technical solutions in the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without making creative efforts fall within the scope of protection of the present invention.

[0050] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "top", "bottom", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of the present invention. In addition, terms such as "first", "second", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0051] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0052] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. 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 a suitable manner in any one or more embodiments or examples. In addition, without conflict, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0053] The following will be combined with Figures 1 - 8 Describe the sealed box temperature control system and method of the present invention.

[0054] According to the embodiments of the first aspect of the present invention, as shown in reference to Figures 1 - 3 The sealed box temperature control system provided by the present invention mainly includes components such as a heat pump unit, a sealed box 1, a first temperature sensor 2, and a controller.

[0055] Among them, the heat pump unit includes a compressor 3, a condenser 4, an electronic expansion valve 5, and an evaporator 6 that are connected in a cycle through a refrigerant circulation pipeline; during refrigeration operation, the high-temperature and high-pressure gaseous refrigerant generated by the compressor 3 enters the condenser 4 for condensation and heat release, then throttles through the electronic expansion valve 5, then evaporates and absorbs heat through the evaporator 6, and finally returns 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 arranged inside the sealed box body 1 and is used to detect the temperature inside the sealed box body 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 degree of the electronic expansion valve 5 according to the detected temperature inside the sealed box body 1 in the case of the heat pump unit operating in refrigeration mode.

[0059] Specifically, when the temperature inside the sealed box body 1 is greater than the safe target set value, it indicates a potential safety hazard. At this time, the opening degree of the electronic expansion valve 5 is reduced, the refrigerant flow rate is reduced, the temperature of the evaporator 6 is lowered, the temperature of the air passing through the evaporator 6 is reduced, and the air passes through the sealed box body 1, exchanges heat with the sealed box body 1, and takes away the heat of the sealed box body 1 to achieve the purpose of reducing the temperature inside the sealed box body 1; when the temperature inside the sealed box body 1 is less than or equal to the safe target set value, it indicates no potential safety hazard. At this time, the current opening degree of the electronic expansion valve 5 is maintained unchanged to ensure the current temperature of the evaporator 6, thereby ensuring the normal operation of the heat pump unit.

[0060] The sealed box body temperature control system provided by the embodiment of the present invention can achieve refrigeration operation through the heat pump unit, enabling the evaporator 6 to absorb heat and reduce the surrounding environment temperature; by arranging the sealed box body 1 side by side with 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; by arranging the first temperature sensor 2 inside the sealed box body 1, the temperature inside the sealed box body 1 can be detected in real time; by electrically connecting the controller to the first temperature sensor 2, the compressor 3, and the electronic expansion valve 5 respectively, and controlling the opening degree of the electronic expansion valve 5 according to the detected temperature inside the sealed box body 1 in the case of the heat pump unit operating in refrigeration mode, thereby controlling the temperature inside the sealed box body 1 to achieve the purpose of reducing the temperature inside the sealed box body 1.

[0061] Therefore, the present invention can precisely control the temperature inside the sealed box body 1 by skillfully combining the heat pump unit with the sealed box body 1, thereby quickly dissipating the heat inside the sealed box body 1, reducing the temperature inside the sealed box body 1, ensuring the normal operation of the electrical components inside the sealed box body 1, and having the characteristics of simple structure, stable and reliable performance, etc.

[0062] According to an embodiment of the present invention, with reference to Figure 1 and Figure 2 as shown, the heat pump unit further includes: a fan 7, which is arranged side by side with the evaporator 6 and is electrically connected to the controller. The controller is further configured to control the rotation speed of the fan 7 according to the detected temperature inside the sealed box 1 when the heat pump unit is operating in the refrigeration mode. When the fan 7 is running, outdoor air passes through the evaporator 6 and blows towards 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 set value, the rotation speed of the fan 7 can be increased at this time 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, so as to ensure the normal operation of the electrical components inside the sealed box 1, prevent explosion, and effectively improve the safety and reliability; when the temperature inside the sealed box 1 is less than or equal to the safe target set value, the rotation speed of the fan 7 remains unchanged at this time, so as to ensure the normal operation of the heat pump unit.

[0064] The sealed box temperature control system provided by the embodiment of the present invention controls the electronic expansion valve 5 and the fan 7 in coordination. Driven by the fan 7, the temperature of the air passing through the evaporator 6 is further 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, effectively reducing the temperature inside the sealed box 1, so as to ensure the normal operation of the electrical components inside the sealed box 1, prevent explosion, and effectively improve the safety and reliability.

[0065] According to an embodiment of the present invention, the evaporator 6 is provided with a second temperature sensor 8, and the second temperature sensor 8 is electrically connected to the controller for detecting the temperature of the evaporator 6.

[0066] According to an embodiment of the present invention, with reference to Figure 1 as shown, a liquid storage tank 9 is provided between the condenser 4 and the electronic expansion valve 5.

[0067] By providing the liquid storage tank 9 between the condenser 4 and the electronic expansion valve 5 in the embodiment of the present invention, the high-pressure liquid from the condenser 4 can be stored, so that the surface of the condenser 4 will not be flooded by the liquid, enabling the heat transfer area of the condenser 4 to fully play its role, and adjusting and stabilizing the refrigerant cycle to adapt to the change of working conditions. In addition, it can also play a 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 an embodiment of the present invention, a filter 10 is provided between the liquid storage tank 9 and the electronic expansion valve 5.

[0069] In the embodiment of the present invention, by arranging a filter 10 between the liquid storage tank 9 and the electronic expansion valve 5, refrigerant impurities in the pipeline can be filtered to avoid blocking 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, realizing precise control of the temperature of the sealed box body 1.

[0070] According to an embodiment of the present invention, the condenser 4 is connected in a cycle with the cooling water supply device 11 through a circulating water path.

[0071] In the embodiment of the present invention, by connecting the condenser 4 in a cycle with the cooling water supply device 11 through a circulating water path, the cooling water supplied by the cooling water supply device 11 can be heated by using the heat released by the condenser 4, thereby obtaining hot water, realizing full recovery and utilization of the system energy, and improving the energy utilization rate of the system.

[0072] According to an embodiment of the present invention, the sealed box body 1 of the present invention can be prepared by using a heat dissipation material, thereby further improving the heat dissipation effect of the sealed box body 1.

[0073] Next, the control method of the sealed box body temperature control system provided by the present invention will be described. The control method of the sealed box body temperature control system described below can be mutually corresponding and referred to with the sealed box body temperature control system described above.

[0074] According to an embodiment of the second aspect of the present invention, with reference to Figure 4 As shown, the present invention also provides a control method for the sealed box body temperature control system of the above embodiment, which mainly includes the following steps:

[0075] S100. When the heat pump unit operates in refrigeration mode, detect the temperature inside the sealed box body 1;

[0076] S200. According to the detected temperature inside the sealed box body 1, control the opening degree of the electronic expansion valve 5.

[0077] In the control method of the sealed box body temperature control system provided by the embodiment of the present invention, by detecting the temperature inside the sealed box body 1 when the heat pump unit operates in refrigeration mode and controlling the opening degree of the electronic expansion valve 5 according to the detected temperature inside the sealed box body 1, the refrigerant flow rate can be adjusted, thereby adjusting the temperature of the evaporator 6, reducing the temperature of the air passing through the evaporator 6, reducing the ambient temperature around the sealed box body 1, increasing the heat exchange amount of the sealed box body 1, and reducing the internal temperature of the sealed box body 1.

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

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

[0080] Determine that the temperature inside the sealed box 1 is less than or equal to the target set value, and keep the opening degree of the electronic expansion valve 5 unchanged.

[0081] When the temperature inside the sealed box 1 is greater than the safe target set value, it indicates a potential safety hazard. At this time, reduce the opening degree of the electronic expansion valve 5, reduce the refrigerant flow rate, lower the temperature of the evaporator 6, so that the temperature of the air passing through the evaporator 6 decreases. The air passes through the sealed box 1 and exchanges heat with the sealed box 1, taking away the heat of the sealed box 1 to achieve the purpose of reducing 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 set value, it indicates no safety hazard. At this time, keep the current opening degree of the electronic expansion valve 5 unchanged to ensure the current temperature of the evaporator 6, thereby ensuring the normal operation of the heat pump unit.

[0082] According to an embodiment of the present invention, with reference to Figure 5 As shown, in the case of the heat pump unit operating in refrigeration mode, it further includes the steps:

[0083] S300. Control the rotational speed of the fan 7 arranged side by side on 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 by the embodiment of the present invention, by jointly controlling the electronic expansion valve 5 and the fan 7, the temperature of the air passing through the evaporator 6 is further reduced under the drive of the fan 7. 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 internal temperature of the sealed box 1.

[0085] According to an embodiment of the present invention, the step of controlling the rotational speed of the fan 7 arranged side by side on the evaporator 6 according to the detected temperature inside the sealed box 1 includes:

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

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

[0088] When the temperature inside the sealed box 1 is greater than the target set value, it indicates a potential safety hazard. At this time, the rotational 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 internal temperature of the sealed box 1, so as to ensure the normal operation of the electrical components inside the sealed box 1, prevent explosion, and effectively improve safety and reliability; when the temperature inside the sealed box 1 is less than or equal to the safe target set value, it indicates no safety hazard. At this time, keep the rotational speed of the fan 7 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 invention will be further described below in conjunction with specific examples.

[0090] In a specific example, referring to Figure 6 as shown, the control method of the sealed box temperature control system provided by the present invention mainly includes the following steps:

[0091] (1) The heat pump unit operates in refrigeration mode;

[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 set value Tax, and determine whether the temperature Tao inside the sealed box 1 is greater than the target set value Tax;

[0094] (4) If Tao > Tax, at this time, reduce the opening degree of the electronic expansion valve 5, reduce the refrigerant flow rate, lower the temperature of the evaporator 6, so that the temperature of the air passing through the evaporator 6 decreases. The air passes through the sealed box 1 and exchanges heat with the sealed box 1, taking away the heat of the sealed box 1 to achieve the purpose of reducing the internal temperature of the sealed box 1;

[0095] (5) If Tao ≤ Tax, at this time, keep the opening degree of the current electronic expansion valve 5 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, referring to Figure 7 as shown, the control method of the sealed box temperature control system provided by the present invention mainly includes the following steps:

[0097] (1) The heat pump unit operates in refrigeration mode;

[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 set value Tax, and determine whether the temperature Tao inside the sealed box 1 is greater than the target set value Tax;

[0100] (4) If Tao > Tax, at this time, increase the speed of the fan 7, 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 internal temperature of the sealed box 1;

[0101] (5) If Tao ≤ Tax, at this time, keep the speed of the fan 7 unchanged, thereby ensuring the normal operation of the heat pump unit.

[0102] In a specific example, referring to Figure 8 as shown, the control method of the sealed box temperature control system provided by the present invention mainly includes the following steps:

[0103] (1) The heat pump unit operates in refrigeration mode;

[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 set value Tax, and determine whether the temperature Tao inside the sealed box 1 is greater than the target set value Tax;

[0106] (4) If Tao > Tax, at this time, reduce the opening degree of the electronic expansion valve 5 and increase the rotational speed of the fan 7. Driven by the fan 7, the temperature of the air passing through the evaporator 6 rapidly decreases. The air passes through the sealed box 1, exchanges heat with the sealed box 1, and quickly takes away the heat of the sealed box 1, effectively reducing the internal temperature of the sealed box 1;

[0107] (5) If Tao ≤ Tax, at this time, keep the opening degree of the current electronic expansion valve 5 and the rotational speed of the fan 7 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 invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A sealed box temperature control system, characterized in that, it includes: A heat pump unit, including a compressor, a condenser, an electronic expansion valve and an evaporator connected in a cycle; A sealed box, arranged side by side with the evaporator; A first temperature sensor, arranged inside the sealed box for detecting the temperature inside the sealed box; A controller, electrically connected to the first temperature sensor, the compressor and the electronic expansion valve respectively, and used for controlling the opening degree of the electronic expansion valve according to the detected temperature inside the sealed box when the heat pump unit operates in refrigeration.

2. The sealed box temperature control system according to claim 1, characterized in that, The heat pump unit further includes: A fan, arranged side by side with the evaporator and electrically connected to the controller, and the controller is further used for controlling the rotation speed of the fan according to the detected temperature inside the sealed box when the heat pump unit operates in refrigeration.

3. The sealed box temperature control system according to claim 1, characterized in that, A second temperature sensor is arranged on the evaporator, and the second temperature sensor is electrically connected to the controller for detecting the temperature of the evaporator.

4. The sealed box temperature control system according to claim 1, characterized in that, A liquid storage tank is arranged between the condenser and the electronic expansion valve.

5. The sealed box temperature control system according to claim 4, characterized in that, A filter is arranged between the liquid storage tank and the electronic expansion valve.

6. The sealed box temperature control system according to any one of claims 1-5, characterized in that, The condenser is connected in a cycle with a cooling water supply device through a cycle waterway.

7. A control method for the sealed box temperature control system according to any one of claims 1-6, characterized in that, it includes: When the heat pump unit operates in refrigeration, detecting the temperature inside the sealed box; Controlling the opening degree of the electronic expansion valve according to the detected temperature inside the sealed box.

8. The control method for the sealed box temperature control system according to claim 7, characterized in that, The step of controlling the opening degree of the electronic expansion valve according to the detected temperature inside the sealed box includes: Determining that the temperature inside the sealed box is greater than the target set value, and reducing the opening degree of the electronic expansion valve; Determining that the temperature inside the sealed box is less than or equal to the target set value, and keeping the opening degree of the electronic expansion valve unchanged.

9. The control method for the sealed box temperature control system according to claim 7, characterized in that, When the heat pump unit operates in refrigeration, it further includes: Controlling the rotation speed of the fan arranged side by side with the evaporator according to the detected temperature inside the sealed box.

10. The control method for the sealed box temperature control system according to claim 9, characterized in that, The step of controlling the rotation speed of the fan arranged side by side with the evaporator according to the detected temperature inside the sealed box includes: Determining that the temperature inside the sealed box is greater than the target set value, and increasing the rotation speed of the fan; Determine that the temperature inside the sealed box is less than or equal to the target set value, and keep the rotation speed of the fan unchanged.

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