Temperature and humidity control device for electrical cabinet

Abstract

The invention particularly relates to a temperature and humidity control device for an electrical cabinet. The temperature and humidity control device comprises a power supply assembly, a control assembly and a closed circulation system composed of a thermoelectric temperature and humidity assembly, a water condensation assembly and a heat dissipation assembly. In the closed circulation system, a coolant in the thermoelectric temperature and humidity assembly (1) is heated based on thermoelectric conversion to form a high-temperature coolant, the high-temperature coolant flows back into the thermoelectric temperature and humidity assembly (1) after flowing to the water condensation assembly and the heat dissipation assembly, and heat in the electrical cabinet (13) is conducted out of the electrical cabinet (13) through reciprocating circulation. The power supply assembly (8) provides direct current for the thermoelectric temperature and humidity assembly (1) and the flow regulating valve (7); the control assembly controls the direct current output by the power supply assembly (8) to the thermoelectric temperature and humidity assembly (1) and controls the opening degree of the flow regulating valve (7). Based on the thermoelectric conversion technology, the temperature in the electrical cabinet is adjusted, the temperature of local hot spots in the electrical cabinet is reduced, and it is ensured that components in the electrical cabinet work at the proper temperature.

Description

Technical Field

[0001] The invention relates to the technical field of thermoelectric conversion and electrical automation, and in particular to a temperature and humidity control device for an electrical cabinet. Background Art

[0002] The high-power IGBT electrical cabinet contains many power components. The large amount of heat dissipation makes the temperature inside the electrical cabinet high. The power components are in a high temperature state for a long time, which reduces the reliability, especially in summer when failures occur frequently. Even in an indoor environment, the temperature in the distribution room is controllable, but due to the arrangement of components in the electrical cabinet and the air flow in the cabinet, there will still be local hot spots, causing the components to still work at a high temperature. The temperature inside the DC power cabinet in the distribution room of a power plant was measured at an indoor temperature of 27°C, and the highest temperature exceeded 70°C. Local hot spots in the electrical cabinet make local components prone to aging, which in turn causes failures, reducing the reliability of the electrical system.

[0003] At present, most electrical cabinet temperature control is mainly achieved by adjusting the ventilation volume through temperature negative feedback. The fan operation noise is large, and under the IP level requirements of the electrical cabinet, the adjustable range of the ventilation volume in the cabinet is limited. Summary of the invention

[0004] The purpose of the present invention is to provide a temperature and humidity control device for an electrical cabinet, which, based on thermoelectric conversion technology, regulates the temperature inside the electrical cabinet, reduces the temperature of local hot spots in the electrical cabinet, and ensures that components in the electrical cabinet operate at a suitable temperature.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] An electrical cabinet temperature and humidity control device comprises a power supply component, a thermoelectric temperature and humidity component, a control component and a condensation component installed in the electrical cabinet, and a heat dissipation component installed outside the electrical cabinet;

[0007] The thermoelectric temperature and humidity component is connected with the condensation component and the heat dissipation component in sequence, and the heat dissipation component is connected with the thermoelectric temperature and humidity component through a flow control valve, forming a closed circulation system that uses the coolant density difference as a driving force to achieve natural circulation;

[0008] In the closed-loop system, the coolant in the thermoelectric temperature and humidity component is heated by thermoelectric conversion to form a high-temperature coolant, which then flows to the condensation component; the high-temperature coolant in the condensation component evaporates the condensed water formed by the heat in the electrical cabinet and flows to the heat dissipation component, and then flows back to the thermoelectric temperature and humidity component after being condensed by the heat dissipation component, and the reciprocating cycle conducts the heat in the electrical cabinet to the outside of the electrical cabinet;

[0009] The power supply component provides direct current to the thermoelectric temperature and humidity component and the flow regulating valve; the control component controls the direct current output by the power supply component to the thermoelectric temperature and humidity component and controls the opening of the flow regulating valve.

[0010] Thermoelectric conversion principle: Based on the Peltier effect of thermoelectric materials, when the thermoelectric device is connected to direct current, one side releases heat and the surface temperature decreases; the other side absorbs heat and the surface temperature increases. The cooler is constructed using the cold surface of the thermoelectric device to reduce the temperature of the air flowing through it; at the same time, a flat evaporator is arranged on the hot surface of the thermoelectric device to connect the heat pipe to export the heat to the outside of the electrical cabinet, thereby reducing the temperature inside the electrical cabinet.

[0011] As one of the possible implementation methods, the thermoelectric temperature and humidity assembly includes a thermoelectric device group, a flat plate evaporator and a fin assembly;

[0012] The fin assembly is installed on the inner side of the air inlet of the electrical cabinet, and the thermoelectric device group and the flat plate evaporator are arranged on the top and bottom of the fin assembly. The cold surface of the thermoelectric device group is in contact with the fin assembly, and the hot surface of the thermoelectric device group is in contact with the flat plate evaporator.

[0013] A heat-conducting medium is filled between the cold surface of the thermoelectric device group and the fin assembly, and between the hot surface of the thermoelectric device group and the flat plate evaporator;

[0014] The flat plate evaporator is filled with coolant, and the coolant in the flat plate evaporator is heated by the heat of the heating surface of the thermoelectric device to form a high-temperature coolant.

[0015] As one of the feasible ways, the thermoelectric device group is composed of a plurality of thermoelectric devices connected in series and parallel, and thermal insulation materials are filled between the thermoelectric devices.

[0016] As one possible implementation, the fin assembly includes an upper fin base plate, a lower fin base plate, and a first fin between the upper fin base plate and the lower fin base plate;

[0017] Thermoelectric device groups and flat plate evaporators are arranged on the top of the fin upper substrate and the bottom of the fin lower substrate. The cold surface of the thermoelectric device group on the top of the fin upper substrate is in contact with and connected to the fin upper substrate, the hot surface of the thermoelectric device group on the top of the fin upper substrate is in contact with and connected to the flat plate evaporator, the cold surface of the thermoelectric device group on the bottom of the fin lower substrate is in contact with and connected to the fin lower substrate, and the hot surface of the thermoelectric device group on the bottom of the fin lower substrate is in contact with and connected to the flat plate evaporator.

[0018] A heat conducting medium is filled between the cold surface of the thermoelectric device group at the top of the fin upper substrate and the fin upper substrate, between the cold surface of the thermoelectric device group at the bottom of the fin lower substrate and the fin lower substrate, between the hot surface of the thermoelectric device group at the top of the fin upper substrate and the flat plate evaporator, and between the hot surface of the thermoelectric device group at the bottom of the fin lower substrate and the flat plate evaporator;

[0019] The upper fin base plate and the lower fin base plate are both welded to the inner wall of the electrical cabinet; the flat plate evaporator on the top of the upper fin base plate is bolted to the upper fin base plate, and the flat plate evaporator at the bottom of the lower fin base plate is bolted to the lower fin base plate; a support frame is provided at the bottom of the flat plate evaporator at the bottom of the lower fin base plate, and the support frame is welded to the inner wall of the electrical cabinet.

[0020] As one of the feasible ways, the heat conducting medium is heat conducting silicone.

[0021] As one possible implementation, the condensation assembly includes a condensation tray and a condensation evaporator; the condensation evaporator includes a container, a first serpentine tube in the container, and a water storage box below the first serpentine tube in the container;

[0022] The condensation tray is below the thermoelectric temperature and humidity assembly, collecting condensed water on the surface of the first fin flowing down along the first fin; the water storage box is connected to the condensation tray, and the condensed water in the condensation tray flows to the water storage box;

[0023] The inlet of the first serpentine tube is respectively connected with the outlet of the flat plate evaporator; the high-temperature coolant in the flat plate evaporator flows to the first serpentine tube; the high-temperature coolant in the first serpentine tube exchanges heat with the condensed water in the water storage box to evaporate the condensed water in the water storage box.

[0024] As one of the feasible ways, the condensate pan is provided with an inclination angle so that the condensed water in the condensate pan can flow naturally toward the water storage box.

[0025] As one possible implementation method, the heat dissipation component includes a condenser;

[0026] The outlet of the first serpentine tube is connected to the inlet of the condenser, and the outlet of the condenser is connected to the inlet of the flat plate evaporator through a flow regulating valve;

[0027] The high-temperature coolant in the first serpentine tube exchanges heat with the condensed water in the water storage box and then flows to the condenser. After being condensed by the condenser, it is sent back to the flat evaporator through the flow regulating valve.

[0028] As one possible implementation, the condenser includes a second serpentine tube and a second fin;

[0029] The first serpentine tube outlet is communicated with the second serpentine tube inlet, and the second serpentine tube outlet is communicated with the flat plate evaporator inlet through a flow regulating valve.

[0030] As one of the possible implementations, the control component includes a temperature and humidity sensor, a controller, and a signal acquisition module;

[0031] There are multiple temperature and humidity sensors, which are used to measure the temperature and humidity values ​​in the electrical cabinet and send them to the signal acquisition module;

[0032] A signal acquisition module is used to receive the temperature and humidity values ​​in the electrical cabinet measured by each temperature and humidity sensor and send them to the controller;

[0033] The controller sets the target value of the average temperature and humidity in the electrical cabinet, and is used to receive the temperature and humidity values ​​in the electrical cabinet measured by each temperature and humidity sensor sent by the signal acquisition module and take the average value to obtain the measured value of the average temperature and humidity in the electrical cabinet; based on the difference between the measured value of the average temperature and humidity in the electrical cabinet and the target value, a control signal is generated to control the opening of the flow control valve and the DC current output by the power supply component to the thermoelectric device group.

[0034] As one of the possible implementations, the temperature and humidity sensor includes a temperature sensor;

[0035] There are multiple temperature sensors, which are distributed inside the air inlet and outlet of the electrical cabinet, and are used to measure the temperature value inside the electrical cabinet and send it to the signal acquisition module;

[0036] A signal acquisition module is used to receive the temperature values ​​in the electrical cabinet measured by each temperature sensor and send them to the controller;

[0037] The controller sets a set value of the average temperature in the electrical cabinet, and is used to receive the temperature values ​​in the electrical cabinet measured by each temperature sensor sent by the signal acquisition module and take the average value to obtain the measured value of the average temperature in the electrical cabinet; according to the difference between the measured value and the set value of the average temperature in the electrical cabinet, a control signal is generated to control the opening of the flow control valve.

[0038] As one of the possible implementations, the temperature and humidity sensor includes a humidity sensor;

[0039] There are multiple humidity sensors, which are distributed in the middle of the inner side of the air outlet of the electrical cabinet, and are used to measure the humidity value in the electrical cabinet and send it to the signal acquisition module;

[0040] A signal acquisition module is used to receive the humidity value in the electrical cabinet measured by each humidity sensor and send it to the controller;

[0041] The controller is provided with a set value of the average humidity in the electrical cabinet, and is used to receive the humidity values ​​in the electrical cabinet measured by each humidity sensor sent by the signal acquisition module and take the average value to obtain the measured value of the average humidity in the electrical cabinet; according to the difference between the measured value and the set value of the average humidity in the electrical cabinet, a control signal is generated to control the DC current output by the power supply component to the thermoelectric device group.

[0042] Beneficial technical effects of the present invention:

[0043] The temperature and humidity control device for an electrical cabinet of the present invention adopts thermoelectric conversion technology, and can accurately, effectively and quietly regulate the temperature and humidity in the electrical cabinet, control the temperature of local hot spots in the electrical cabinet, and enable the components in the electrical cabinet to operate within a suitable temperature and humidity range, thereby extending the service life of the components in the electrical cabinet and improving the reliability of the electrical system. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a structural schematic diagram of an embodiment of the temperature and humidity control device for an electrical cabinet of the present invention;

[0045] Figure 2 It is a structural schematic diagram of an embodiment of the thermoelectric temperature and humidity assembly of the present invention;

[0046] Figure 3 It is a schematic diagram of the upper structure of an embodiment of the fin assembly of the present invention;

[0047] Figure 4 It is a schematic diagram of the lower structure of an embodiment of the fin assembly of the present invention;

[0048] Figure 5 It is a structural schematic diagram of an embodiment of the condenser of the present invention.

[0049] In the figure, 1. thermoelectric temperature and humidity assembly; 2. condensation evaporator; 3. condensation tray; 4. thermoelectric device group; 5. electrical cabinet air inlet; 6. flat plate evaporator; 7. flow control valve; 8. power supply assembly; 9. condenser; 10. temperature and humidity sensor; 11. electrical cabinet air outlet; 12. controller; 13. electrical cabinet; 14. flat plate evaporator outlet pipe; 15. fin; 16. flat plate evaporator inlet pipe; 17. fastening bolts; 18. fin upper substrate; 19. heat transfer medium; 20. fixing weld; 21. fin lower substrate; 22. support frame; 23. second serpentine tube; 24. second fin. DETAILED DESCRIPTION

[0050] The technical solution of the present invention is described clearly and completely below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] In the description of the present invention, it should be understood that the terms "left end", "right end", "top", "bottom", "outside", "inside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing 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 cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0052] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] See also Figure 1-5 , this embodiment provides an electrical cabinet temperature and humidity control device, including a power supply component 8, a thermoelectric temperature and humidity component 1, a control component and a condensation component installed in the electrical cabinet, and a heat dissipation component installed outside the electrical cabinet;

[0054] The thermoelectric temperature and humidity component 1 is connected with the condensation component and the heat dissipation component in sequence, and the heat dissipation component is connected with the thermoelectric temperature and humidity component 1 through the flow regulating valve 7, forming a closed circulation system that uses the coolant density difference as a driving force to realize natural circulation;

[0055] In the closed-loop system, the coolant in the thermoelectric temperature and humidity component 1 is heated based on thermoelectric conversion to form a high-temperature coolant, and then flows to the condensation component; the high-temperature coolant in the condensation component evaporates the condensed water formed by the heat in the electrical cabinet 13 and flows to the heat dissipation component, and then flows back to the thermoelectric temperature and humidity component 1 after condensation by the heat dissipation component, and the reciprocating cycle conducts the heat in the electrical cabinet 13 to the outside of the electrical cabinet 13;

[0056] The power supply component 8 provides direct current to the thermoelectric temperature and humidity component 1 and the flow regulating valve 7; the control component controls the direct current output by the power supply component 8 to the thermoelectric temperature and humidity component 1 and controls the opening of the flow regulating valve 7.

[0057] Thermoelectric conversion principle: Based on the Peltier effect of thermoelectric materials, when the thermoelectric device is connected to direct current, one side releases heat and the surface temperature decreases; the other side absorbs heat and the surface temperature increases. The cooler is constructed using the cold surface of the thermoelectric device to reduce the temperature of the air flowing through it; at the same time, a flat evaporator is arranged on the hot surface of the thermoelectric device to connect the heat pipe to export the heat to the outside of the electrical cabinet, thereby reducing the temperature inside the electrical cabinet.

[0058] In this embodiment, as one of the achievable ways, the thermoelectric temperature and humidity assembly 1 includes a thermoelectric device group 4, a flat plate evaporator 6 and a fin assembly;

[0059] The fin assembly is installed inside the air inlet 5 of the electrical cabinet, and the thermoelectric device group 4 and the flat plate evaporator 6 are arranged on the top and bottom of the fin assembly. The cold surface of the thermoelectric device group 4 is in contact with the fin assembly, and the hot surface of the thermoelectric device group 4 is in contact with the flat plate evaporator.

[0060] A heat-conducting medium is filled between the cold surface of the thermoelectric device group 4 and the fin assembly, and between the hot surface of the thermoelectric device group 4 and the flat plate evaporator 6;

[0061] The flat plate evaporator 6 is filled with coolant, and the coolant in the flat plate evaporator 6 is heated by the heat of the hot surface of the thermoelectric device group 4 to form a high-temperature coolant.

[0062] In this embodiment, as one of the feasible ways, the thermoelectric device group 4 is composed of a plurality of thermoelectric devices connected in series and parallel, and heat insulating materials are filled between the thermoelectric devices to improve the energy efficiency of the thermoelectric device group.

[0063] In this embodiment, as one of the achievable ways, the fin assembly includes an upper fin base plate 18, a lower fin base plate 21, and a first fin 15 between the upper fin base plate 18 and the lower fin base plate 21;

[0064] Thermoelectric device groups 4 and flat plate evaporators 6 are arranged at the top of the fin upper substrate 18 and the bottom of the fin lower substrate 21. The cold surface of the thermoelectric device group 4 at the top of the fin upper substrate 18 is in contact with and connected to the fin upper substrate 18, the hot surface of the thermoelectric device group 4 at the top of the fin upper substrate 18 is in contact with and connected to the flat plate evaporator 6, the cold surface of the thermoelectric device group 4 at the bottom of the fin lower substrate 21 is in contact with and connected to the fin lower substrate 21, and the hot surface of the thermoelectric device group 4 at the bottom of the fin lower substrate 21 is in contact with and connected to the flat plate evaporator 6;

[0065] The space between the cold surface of the thermoelectric device group 4 at the top of the fin upper substrate 18 and the fin upper substrate 18, the space between the cold surface of the thermoelectric device group 4 at the bottom of the fin lower substrate 21 and the fin lower substrate 21, the space between the hot surface of the thermoelectric device group 4 at the top of the fin upper substrate 18 and the flat plate evaporator 6, and the space between the hot surface of the thermoelectric device group 4 at the bottom of the fin lower substrate 21 and the flat plate evaporator 6 are all filled with heat conducting medium;

[0066] The fin upper substrate 18 and the fin lower substrate 21 are both welded to the inner wall of the electrical cabinet 13; the flat plate evaporator 6 at the top of the fin upper substrate 18 is bolted to the fin upper substrate 18, and the flat plate evaporator 6 at the bottom of the fin lower substrate 21 is bolted to the fin lower substrate 21; a support frame 22 is provided at the bottom of the flat plate evaporator 6 at the bottom of the fin lower substrate 21, and the support frame 22 is welded to the inner wall of the electrical cabinet 13.

[0067] In this embodiment, as one of the feasible ways, the heat conducting medium is heat conducting silica gel.

[0068] In this embodiment, as one of the achievable ways, the condensation assembly includes a condensation tray 3 and a condensation evaporator 2;

[0069] The condensate evaporator 2 comprises a container, a first serpentine tube in the container, and a water storage box below the first serpentine tube in the container;

[0070] The condensation tray 3 is below the thermoelectric temperature and humidity assembly 1, and collects the condensation water on the surface of the first fin 15 flowing down along the first fin 15; the water storage box is connected to the condensation tray 3, and the condensation water in the condensation tray 3 flows to the water storage box;

[0071] The inlet of the first serpentine tube is connected to the outlet of the flat plate evaporator 6; the high-temperature coolant in the flat plate evaporator 6 flows to the first serpentine tube; the high-temperature coolant in the first serpentine tube exchanges heat with the condensed water in the water storage box to evaporate the condensed water in the water storage box.

[0072] In this embodiment, as one of the feasible ways, the condensate tray 3 has an inclination, so that the condensate in the condensate tray 3 naturally flows toward the water storage box.

[0073] In this embodiment, as one of the achievable ways, the heat dissipation assembly includes a condenser 9;

[0074] The outlet of the first serpentine tube is connected to the inlet of the condenser 9, and the outlet of the condenser 9 is connected to the inlet of the flat plate evaporator 6 through the flow regulating valve 7;

[0075] The high-temperature coolant in the first serpentine tube exchanges heat with the condensed water in the water storage box and then flows to the condenser 9 , and after being condensed by the condenser 9 , is sent back to the flat evaporator 6 through the flow regulating valve 7 .

[0076] In this embodiment, as one of the feasible methods, the condenser 9 calculates the heat exchange area according to the heat required for temperature control in the electrical cabinet 13, adopts the type of serpentine tube through fins, and is installed as a whole outside the electrical cabinet 13, and its inlet and outlet serpentine tubes are perforated at the top of the electrical cabinet 13 to the inside of the electrical cabinet 13.

[0077] In this embodiment, as one of the achievable ways, the condenser 9 includes a second serpentine tube 23 and a second fin 24;

[0078] The outlet of the first serpentine tube is communicated with the inlet of the second serpentine tube 23 , and the outlet of the second serpentine tube 23 is communicated with the inlet of the flat plate evaporator 6 through the flow regulating valve 7 .

[0079] In this embodiment, as one of the achievable ways, the first fin 15 and the second fin 24 are both made of aluminum; the first serpentine tube and the second serpentine copper tube 23 are both made of copper.

[0080] In this embodiment, as one of the achievable methods, the control component includes a temperature and humidity sensor 10, a controller 12 and a signal acquisition module;

[0081] There are multiple temperature and humidity sensors 10, which are used to measure the temperature and humidity values ​​in the electrical cabinet 13 and send them to the signal acquisition module;

[0082] A signal acquisition module, used to receive the temperature and humidity values ​​in the electrical cabinet 13 measured by each temperature and humidity sensor and send them to the controller 12;

[0083] The controller 12 sets a target value for the average temperature and humidity in the electrical cabinet 13, and is used to receive the temperature and humidity values ​​in the electrical cabinet 13 measured by each temperature and humidity sensor sent by the signal acquisition module and take the average value to obtain the measured value of the average temperature and humidity in the electrical cabinet 13; based on the difference between the measured value of the average temperature and humidity in the electrical cabinet 13 and the target value, a control signal is generated to control the opening of the flow regulating valve 7 and the DC current output by the power supply assembly 8 to the thermoelectric device group 4.

[0084] In this embodiment, as one of the implementable ways, the temperature and humidity sensor 10 includes a temperature sensor;

[0085] There are multiple temperature sensors, which are distributed inside the air inlet 5 of the electrical cabinet and inside the air outlet 11 of the electrical cabinet, and are used to measure the temperature value inside the electrical cabinet 13 and send it to the signal acquisition module;

[0086] A signal acquisition module, used to receive the temperature values ​​in the electrical cabinet 13 measured by each temperature sensor and send them to the controller 12;

[0087] The controller 12 sets a set value of the average temperature in the electrical cabinet 13, and is used to receive the temperature values ​​in the electrical cabinet 13 measured by various temperature sensors sent by the signal acquisition module and take the average value to obtain the measured value of the average temperature in the electrical cabinet 13; based on the difference between the measured value and the set value of the average temperature in the electrical cabinet 13, a control signal is generated to control the opening of the flow control valve 7.

[0088] In this embodiment, as one of the achievable methods, the temperature and humidity sensor 10 includes a humidity sensor;

[0089] There are multiple humidity sensors, which are distributed in the middle of the inner side of the electrical cabinet air outlet 11 and are used to measure the humidity value in the electrical cabinet 13 and send it to the signal acquisition module;

[0090] A signal acquisition module, used to receive the humidity values ​​in the electrical cabinet 13 measured by each humidity sensor and send them to the controller 12;

[0091] The controller 12 is provided with a set value of the average humidity in the electrical cabinet 13, and is used to receive the humidity values ​​in the electrical cabinet 13 measured by each humidity sensor sent by the signal acquisition module and take the average value to obtain the measured value of the average humidity in the electrical cabinet 13; according to the difference between the measured value and the set value of the average humidity in the electrical cabinet 13, a control signal is generated to control the DC current output by the power supply component 8 to the thermoelectric device group 4.

[0092] In this embodiment, as one of the feasible ways, the input end of the power supply component 8 is connected to the 220VAC mains, and the output end of the power supply component 8 is adapted to the DC current required by the flow control valve 7 and the thermoelectric device group 4; the power supply component 8 realizes DC current regulation and switching according to the control signal; the output end of the power supply component 8 is respectively connected to the flow control valve 7 and the thermoelectric device group 4, and outputs DC current to the flow control valve 7 and the thermoelectric device group 4.

[0093] The temperature and humidity control device of the electrical cabinet of the present embodiment adopts thermoelectric conversion technology, which can accurately, effectively and quietly regulate the temperature and humidity in the electrical cabinet, control the temperature of local hot spots in the electrical cabinet, and realize that the outlet temperature of the electrical cabinet 13 is adjustable within (25~40)℃, with a control accuracy of ±1℃; it realizes that the average temperature in the electrical cabinet 13 is reduced from the original 51.7℃ to 26.4℃, thereby extending the service life of the components in the electrical cabinet and improving the reliability of the electrical system.

[0094] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A temperature and humidity control device for an electrical cabinet, characterized in that: It comprises a power supply component (8), a thermoelectric temperature and humidity component (1), a control component and a condensation component installed in an electrical cabinet (13), and a heat dissipation component installed outside the electrical cabinet (13); The thermoelectric temperature and humidity component (1) is connected to the condensation component and the heat dissipation component in sequence, and the heat dissipation component is connected to the thermoelectric temperature and humidity component (1) through a flow control valve (7), forming a closed circulation system that uses the coolant density difference as a driving force to achieve natural circulation; In the closed-loop system, the coolant in the thermoelectric temperature and humidity component (1) is heated based on thermoelectric conversion to form a high-temperature coolant, and then flows to the condensation component; the high-temperature coolant in the condensation component evaporates condensed water formed by heat in the electrical cabinet (13) and then flows to the heat dissipation component, and then flows back to the thermoelectric temperature and humidity component (1) after being condensed by the heat dissipation component, and the reciprocating cycle is used to conduct the heat in the electrical cabinet (13) to the outside of the electrical cabinet (13); The power supply component (8) provides direct current to the thermoelectric temperature and humidity component (1) and the flow regulating valve (7); the control component controls the direct current output by the power supply component (8) to the thermoelectric temperature and humidity component (1) and controls the opening of the flow regulating valve (7).

2. The temperature and humidity control device for an electrical cabinet according to claim 1, characterized in that: The thermoelectric temperature and humidity assembly (1) comprises a thermoelectric device group (4), a flat plate evaporator (6) and a fin assembly; The fin assembly is installed on the inner side of the air inlet (5) of the electrical cabinet, and the thermoelectric device group (4) and the flat plate evaporator (6) are arranged on the top and bottom of the fin assembly. The cold surface of the thermoelectric device group (4) is in contact with the fin assembly, and the hot surface of the thermoelectric device group (4) is in contact with the flat plate evaporator. A heat-conducting medium is filled between the cold surface of the thermoelectric device group (4) and the fin assembly, and between the hot surface of the thermoelectric device group (4) and the flat plate evaporator (6); a coolant is filled in the flat plate evaporator (6), and the coolant in the flat plate evaporator (6) is heated by the heat of the hot surface of the thermoelectric device group (4) to form a high-temperature coolant.

3. The temperature and humidity control device for an electrical cabinet according to claim 2, characterized in that: The thermoelectric device group (4) is composed of a plurality of thermoelectric devices connected in series and in parallel, and heat insulating materials are filled between the thermoelectric devices.

4. The temperature and humidity control device for an electrical cabinet according to claim 2, characterized in that: The fin assembly comprises an upper fin base plate (18), a lower fin base plate (21), and a first fin (15) between the upper fin base plate (18) and the lower fin base plate (21); Thermoelectric device groups (4) and flat plate evaporators (6) are arranged at the top of the fin upper substrate (18) and the bottom of the fin lower substrate (21); the cold surface of the thermoelectric device group (4) at the top of the fin upper substrate (18) is in contact with and connected to the fin upper substrate (18); the hot surface of the thermoelectric device group (4) at the top of the fin upper substrate (18) is in contact with and connected to the flat plate evaporator (6); the cold surface of the thermoelectric device group (4) at the bottom of the fin lower substrate (21) is in contact with and connected to the fin lower substrate (21); and the hot surface of the thermoelectric device group (4) at the bottom of the fin lower substrate (21) is in contact with and connected to the flat plate evaporator (6); A heat-conducting medium is filled between the cold surface of the thermoelectric device group (4) at the top of the fin upper substrate (18) and the fin upper substrate (18), between the cold surface of the thermoelectric device group (4) at the bottom of the fin lower substrate (21) and the fin lower substrate (21), between the hot surface of the thermoelectric device group (4) at the top of the fin upper substrate (18) and the flat plate evaporator (6), and between the hot surface of the thermoelectric device group (4) at the bottom of the fin lower substrate (21) and the flat plate evaporator (6); The fin upper substrate (18) and the fin lower substrate (21) are both welded to the inner wall of the electrical cabinet (13) 13; the flat plate evaporator (6) at the top of the fin upper substrate (18) is bolted to the fin upper substrate (18), and the flat plate evaporator (6) at the bottom of the fin lower substrate (21) is bolted to the fin lower substrate (21); a support frame (22) is provided at the bottom of the flat plate evaporator (6) at the bottom of the fin lower substrate (21), and the support frame (22) is welded to the inner wall of the electrical cabinet (13) 13.

5. The temperature and humidity control device for an electrical cabinet according to claim 4, characterized in that: The heat conducting medium is thermally conductive silicone.

6. The temperature and humidity control device for an electrical cabinet according to claim 4, characterized in that: The condensation assembly comprises a condensation tray (3) and a condensation evaporator (2); the condensation evaporator (2) comprises a container, a first serpentine tube in the container, and a water storage box below the first serpentine tube in the container; The condensation tray (3) is located below the thermoelectric temperature and humidity assembly (1) and collects condensed water on the surface of the first fin (15) flowing down along the first fin (15); The water storage box is connected to the condensation tray (3), and the condensed water in the condensation tray (3) flows toward the water storage box; The inlet of the first serpentine tube is respectively connected to the outlet of the flat plate evaporator (6); the high-temperature coolant in the flat plate evaporator (6) flows to the first serpentine tube; the high-temperature coolant in the first serpentine tube exchanges heat with the condensed water in the water storage box, thereby evaporating the condensed water in the water storage box.

7. The temperature and humidity control device for an electrical cabinet according to claim 6, characterized in that: The condensate tray (3) has an inclination angle, so that the condensed water in the condensate tray (3) naturally flows toward the water storage box.

8. The temperature and humidity control device for an electrical cabinet according to claim 6, characterized in that: The heat dissipation component includes a condenser (9); The outlet of the first serpentine tube is connected to the inlet of the condenser (9), and the outlet of the condenser (9) is connected to the inlet of the flat plate evaporator (6) through a flow regulating valve (7); The high-temperature coolant in the first serpentine tube exchanges heat with the condensed water in the water storage box and flows to the condenser (9). After being condensed by the condenser (9), the coolant is sent back to the flat evaporator (6) through the flow regulating valve (7).

9. The temperature and humidity control device for an electrical cabinet according to claim 8, characterized in that: The condenser (9) comprises a second serpentine tube (23) and a second fin (24); The outlet of the first serpentine tube is communicated with the inlet of the second serpentine tube (23), and the outlet of the second serpentine tube (23) is communicated with the inlet of the flat plate evaporator (6) through a flow regulating valve (7).

10. The temperature and humidity control device for an electrical cabinet according to claim 1, characterized in that: The control component includes a temperature and humidity sensor (10), a controller (12) and a signal acquisition module; There are multiple temperature and humidity sensors (10) for measuring the temperature and humidity values ​​in the electrical cabinet (13) and sending them to the signal acquisition module; A signal acquisition module, used for receiving the temperature and humidity values ​​in the electrical cabinet (13) measured by each temperature and humidity sensor and sending them to the controller (12); The controller (12) sets a target value for the average temperature and humidity in the electrical cabinet (13), and is used to receive the temperature and humidity values ​​in the electrical cabinet (13) measured by the temperature and humidity sensors sent by the signal acquisition module and take the average value to obtain the measured value of the average temperature and humidity in the electrical cabinet (13); and to generate a control signal based on the difference between the measured value of the average temperature and humidity in the electrical cabinet (13) and the target value to control the opening of the flow control valve (7) and the DC current output by the power supply component (8) to the thermoelectric device group (4).

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