Thermal insulation, heating and heat storage electrical cabinet for extremely cold region and control method thereof

Abstract

The invention provides a heat preservation, heating and heat storage electrical cabinet for an extremely cold region and a control method thereof, and relates to the technical field of electrical cabinets, the electrical cabinet comprises a cabinet body, a liquid storage tank, a heat storage tank, a circulation pipeline and a controller, the controller controls a first circulation loop to be communicated according to the temperature of heat conduction oil in the liquid storage tank, and the heat conduction oil in the liquid storage tank is sucked to a heat exchange pipe; heating the phase change material; and when the temperature in the cabinet body is lower than a second set temperature, the second circulation loop is controlled to be communicated, and the heat conduction oil heated by the phase change material is sucked into the heat exchanger to heat the interior of the cabinet body. The solar thermal collector has the beneficial effects that the heat conduction oil is heated by the solar thermal collector in the daytime, the phase-change material is heated through the heat conduction oil, and the phase-change material stores heat; at night, the phase change materials release heat in a phase change mode to heat the heat conduction oil and heat the interior of the cabinet body, so that the interior of the cabinet body has a long-time heat preservation effect, electrical elements are prevented from being out of order or breaking down in a low-temperature environment, and energy consumption is effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical cabinets, and in particular to an electrical cabinet for heat preservation, heating and heat storage in extremely cold areas and a control method thereof. Background Art

[0002] The lowest temperature in the high latitudes in northern my country, some high-altitude areas such as the Qinghai-Tibet Plateau, and the North and South Poles of the earth can reach -40℃ or even lower, which are extremely cold areas in the usual sense. With the development of science and technology, human activity areas have reached the above-mentioned extremely cold areas. Human production, life, or living and work are inseparable from electricity and electrical equipment. At extremely low temperatures, the conductivity, insulation characteristics, switching characteristics, and limit voltage of electrical components will be significantly attenuated, and electrical equipment will not be able to start normally, the display / control screen will be distorted, and the battery life will be sharply reduced. In short, at extremely low temperatures, the failure rate of electrical equipment increases significantly, affecting people's normal work and life, and even threatening people's normal survival in some occasions. Electrical equipment is usually placed in electrical cabinets, so the thermal environment inside the electrical cabinet directly affects whether the electrical equipment can work reliably.

[0003] At present, most of the insulation measures for electrical cabinets are to move the electrical cabinets indoors, which cannot solve the need for some cabinets to be used outdoors in extremely low temperature environments. In addition, there is also a method of simply installing electric heaters and fans inside the cabinets, which has the problems of high energy consumption and insufficient energy saving and economy, as well as the problem of damage to electrical components due to the rapid drop of the cabinet temperature to the ambient temperature in certain power outage situations. Summary of the invention

[0004] In view of this, in order to solve the problem that electrical components inside electrical cabinets in extremely cold regions are prone to low-temperature failures, an embodiment of the present invention provides an electrical cabinet for heat preservation, heating, and heat storage in extremely cold regions and a control method thereof.

[0005] An embodiment of the present invention provides an electrical cabinet for heat preservation, heating and heat storage in extremely cold regions, comprising:

[0006] A cabinet with a double-layer vacuum structure has an openable sealed door on its front side, and a heat exchanger and a first temperature sensor are arranged inside the cabinet;

[0007] A liquid storage tank storing heat transfer oil, which is arranged on the top of the cabinet, a solar collector is arranged on the top of the liquid storage tank, and the solar collector is used to heat the heat transfer oil. A second temperature sensor is arranged in the liquid storage tank;

[0008] A heat storage tank capable of being buried underground, having a heat exchange tube inside, and an electric heater, a phase change material and a third temperature sensor located outside the heat exchange tube;

[0009] a circulation pipeline, comprising a first circulation loop connecting the liquid storage tank and the heat exchange tube, and a second circulation loop connecting the heat exchange tube and the heat exchanger;

[0010] and a controller, which is respectively connected to the first temperature sensor, the second temperature sensor and the third temperature sensor to obtain the internal temperature of the inner cabinet, the temperature of the heat transfer oil in the liquid storage tank and the temperature of the phase change material. The controller is also connected to the first circulation loop and the second circulation loop. The controller is used to control the connection and disconnection of the first circulation pipeline and the second circulation pipeline so that the solar energy absorbed by the heat transfer oil in the liquid storage tank is used to heat the phase change material, and heat the inner cabinet through the phase change material.

[0011] Furthermore, it also includes a backup battery and a dual power automatic transfer switch, and the controller is connected to the backup battery through the dual power automatic transfer switch.

[0012] Further, the circulation pipeline includes a first water inlet pipe, a first water return pipe, a second water inlet pipe, a second water return pipe, a first electromagnetic three-way valve, a second electromagnetic three-way valve and a circulation pump, wherein the liquid storage tank, the first water inlet pipe, the first electromagnetic three-way valve, the circulation pump, the second water inlet pipe, the heat exchange pipe, the second water return pipe, the second electromagnetic three-way valve and the first return pipe are connected in sequence to form a first circulation loop; and the first electromagnetic three-way valve and the second electromagnetic three-way valve are respectively connected to the heat exchanger, so that the first electromagnetic three-way valve, the circulation pump, the second water inlet pipe, the heat exchange pipe, the second water return pipe, the second electromagnetic three-way valve and the heat exchanger form a second circulation loop, and the controller connects the first electromagnetic three-way valve, the second electromagnetic three-way valve, the circulation pump and the electric heater, and the controller is used to control the connection and disconnection of the first circulation pipeline and the second circulation pipeline.

[0013] Furthermore, the number of the heat exchange tubes is set to be multiple, and the multiple heat exchange tubes are arranged side by side. The heat exchange tubes are wavy flat tubes, and both ends of all the heat exchange tubes are respectively connected to two manifolds, and the second water inlet pipe and the second water return pipe are respectively connected to the two manifolds.

[0014] Furthermore, the top of the cabinet is triangular, and the solar collectors are respectively arranged on two side surfaces of the top of the cabinet.

[0015] Furthermore, the outer wall of the cabinet is an insulation board, and the outside of the circulation pipeline and the outer wall of the heat storage box are wrapped with insulation material.

[0016] Furthermore, an air guide tube is provided at the bottom of the cabinet, and the air guide tube is in a stepped cylinder shape. The heat exchanger is installed on the upper part of the air guide tube, a fan is provided inside the air guide tube, a plurality of air guide plates are provided at the lower part of the air guide tube, an air inlet is provided on the lower outer wall of the air guide tube, and a filter is provided on the inner side of the air inlet.

[0017] Furthermore, an air extraction port is provided on the inner wall of the cabinet.

[0018] In addition, an embodiment of the present invention further provides the above-mentioned control method for the insulation, heating, and heat storage electrical cabinet in extremely cold regions, comprising the following steps:

[0019] S1, the controller obtains the internal temperature of the cabinet, the temperature of the heat transfer oil in the liquid storage tank and the temperature of the phase change material through the first temperature sensor, the second temperature sensor and the third temperature sensor;

[0020] S2, when the controller determines that the temperature of the heat transfer oil in the liquid storage tank rises to the first set temperature, the controller controls the first circulation loop to be connected, and controls the heat transfer oil in the liquid storage tank to flow to the heat exchange tube, and the heat transfer oil heats the phase change material in the heat storage tank when flowing through the heat exchange tube;

[0021] S3, when the controller determines that the temperature inside the cabinet is lower than the second set temperature, the controller controls the second circulation loop to be connected, and controls the heat transfer oil heated by the phase change material to flow to the heat exchanger, and the heat transfer oil heats the cabinet when flowing through the heat exchanger;

[0022] S4. When the controller determines that the temperature of the phase change material is lower than the third set temperature, the controller controls the electric heater to heat the phase change material and the heat transfer oil, so as to heat the inside of the heat storage tank to a fourth set temperature.

[0023] Furthermore, the step S2 also includes: when the controller determines that the temperature of the heat transfer oil in the liquid storage tank rises to a first set temperature and the temperature inside the inner cabinet is lower than a second preset temperature, controlling the second circulation loop to be connected.

[0024] The beneficial effects brought about by the technical solution provided by the embodiment of the present invention are:

[0025] 1. The present invention is an insulation, heating and heat storage electrical cabinet for extremely cold areas and a control method thereof. During the day, a solar collector is used to heat the heat transfer oil, and the heat transfer oil is used to heat the phase change material, and the phase change material stores heat. At night, the phase change material releases heat to heat the heat transfer oil, and the heated heat transfer oil is then pumped to a heat exchanger to heat the inside of the cabinet, so that the inside of the cabinet has a long-term insulation effect, avoiding malfunction or failure of electrical components in a low temperature environment, and can also effectively reduce the insulation energy consumption of the electrical cabinet.

[0026] 2. The present invention is an electrical cabinet for heat preservation, heating and heat storage in extremely cold areas and a control method thereof. When it is rainy or other weather conditions where the solar collector cannot be used to heat the heat transfer oil, the phase change material and the heat transfer oil are directly heated by an electric heater in a heat storage tank. The heat of the heat transfer oil is then consumed to heat the inside of the cabinet through a heat exchanger, and then the heat generated by the phase change of the phase change material is used to heat the heat transfer oil to supplement the heat consumption of the heat transfer oil. This can effectively extend the insulation time of a single heating by the electric heater, reduce the heating frequency (start and stop times) of the electric heater, extend the operating life of the equipment, and make it suitable for long-term operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of an electrical cabinet for heat preservation, heating and heat storage in extremely cold regions according to the present invention;

[0028] Figure 2 This is an internal structural diagram of an electrical cabinet for heat preservation, heating and heat storage in extremely cold areas according to the present invention;

[0029] Figure 3 It is a cross-sectional view of an electrical cabinet for heat preservation, heating and heat storage in extremely cold regions according to the present invention;

[0030] Figure 4 is a schematic diagram of a heat exchange tube;

[0031] Figure 5 It is a schematic diagram of the fan and the air guide tube;

[0032] Figure 6 The present invention is a flow chart of a control method for a heat preservation, heating and heat storage electrical cabinet used in extremely cold areas.

[0033] In the figure: 1. cabinet; 2. liquid storage tank; 3. heat storage tank; 4. controller; 5. heat exchanger; 6. circuit board; 7. solar collector; 8. second temperature sensor; 9. inner cabinet; 10. outer cabinet; 11. insulation board; 12. heat exchange tube; 13. phase change material; 14. electric heater; 15. first water inlet pipe; 16. first electromagnetic three-way valve; 17. circulation pump; 18. second water inlet pipe; 19. second water return pipe; 20. second electromagnetic three-way valve; 21. third temperature sensor; 22. first water return pipe; 23. fan; 24. air guide tube; 25. air outlet; 26. first temperature sensor; 27. backup battery; 28. air guide plate; 29. ​​manifold; 30. sealing door. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the present invention clearer, the following will further describe the embodiments of the present invention in conjunction with the accompanying drawings. The following is a preferred embodiment of the present invention, which is intended to provide a basic understanding of the present invention, but is not intended to confirm the key or decisive elements of the present invention or to limit the scope of protection.

[0035] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0036] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0037] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in the subsequent drawings. At the same time, it should be understood that for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0038] In the description of the present invention, it should be noted that the circuits, electronic components and modules involved in the present invention are all prior art and can be fully implemented by those skilled in the art without further elaboration.

[0039] It should be further explained that, unless otherwise clearly specified and limited, the terms "installation" and "connection" 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 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.

[0040] Please refer to Figure 1 , 2 3. An embodiment of the present invention provides an electrical cabinet for heat preservation, heating and heat storage in extremely cold areas, which is used outdoors in extremely cold areas such as the Qinghai-Tibet Plateau and Antarctica. The electrical cabinet for heat preservation, heating and heat storage in extremely cold areas mainly includes a cabinet body 1, a liquid storage tank, a heat storage tank 3, a circulation pipeline and a controller 4.

[0041] The cabinet 1 has a space for arranging electrical components, and an openable sealed door 30 is provided on the front side to place the electrical components in. The shape of the cabinet 1 can be flexibly set according to the actual arrangement requirements of the electrical components. For example, in this embodiment, the shape of the cabinet 1 is set to be a rectangular parallelepiped.

[0042] The cabinet 1 has a good thermal insulation effect. The cabinet 1 is a double-layer vacuum structure, specifically including an inner cabinet 9, and an outer cabinet 10 arranged on the periphery of the inner cabinet 9, and a vacuum chamber is formed between the outer cabinet 10 and the inner cabinet 9. The cabinet 1 adopts a double-layer hollow structure to reduce the heat exchange between the inner cabinet 9 and the outer cabinet 10. The use of vacuum insulation can effectively reduce the heat loss inside the inner cabinet 9 and improve the thermal insulation performance. In some embodiments, in order to evacuate the vacuum chamber, the inner wall of the inner cabinet 9 is provided with an air suction port 25, and the air suction port 25 is connected to the vacuum chamber, and the vacuum chamber can be evacuated by a vacuum pump. And in order to further reduce the heat loss inside the cabinet 1, the outer wall of the outer cabinet 10 is an insulation board 11.

[0043] The inner cabinet 9 is provided with a heat exchanger 5 and a first temperature sensor 26. The heat exchanger 5 is installed at the bottom of the inner cabinet 9. Figure 5 As shown, an air guide 24 is provided at the bottom of the inner cabinet 9, and the air guide 24 is in a stepped cylinder shape. The heat exchanger 5 is installed on the upper part of the air guide 24. A fan 23 is provided inside the air guide 24, and the fan 23 is located below the heat exchanger 5 and is aligned with the heat exchanger 5. A plurality of air guide plates 28 are provided at the lower part of the air guide 24, and the air guide plates 28 are evenly distributed around the axis of the air guide 24. An air inlet is provided on the lower outer wall of the air guide 24, and a filter is provided inside the air inlet, and the filter can filter the air to be heated.

[0044] The first thermometer is generally disposed in the middle of the inner cabinet 9 so as to accurately detect the temperature inside the inner cabinet 9 .

[0045] The liquid storage tank is arranged on the top of the cabinet 1. The liquid storage tank stores heat transfer oil. The top of the liquid storage tank is provided with a solar collector 7. The solar collector 7 is used to heat the heat transfer oil. The liquid storage tank is provided with a second temperature sensor 8. The second temperature sensor 8 can detect the temperature of the heat transfer oil in the liquid storage tank.

[0046] In order to improve the heating efficiency of the solar collector 7, the top of the cabinet 1 is triangular, and the solar collector 7 is respectively arranged on two sides of the top of the cabinet 1, so that the solar collector 7 has a larger light receiving area and can absorb solar energy more efficiently.

[0047] The heat storage tank 3 can generally be buried underground, where the temperature of the underground soil is relatively constant and changes relatively slowly, which has a heat preservation effect on the heat storage tank 3 and can extend the heat preservation time of the heat storage tank 3. The outer wall of the heat storage tank 3 is wrapped with heat preservation materials such as heat preservation cotton to reduce heat loss.

[0048] Recombination Figure 4 As shown, the heat storage tank 3 is provided with a heat exchange tube 12, and an electric heater 14, a phase change material 13 and a third temperature sensor 21 located outside the heat exchange tube 12. In order to improve the heat exchange efficiency inside the heat storage tank 3, the number of the heat exchange tubes 12 is set to be multiple, and the multiple heat exchange tubes 12 are arranged side by side. The heat exchange tubes 12 are wavy flat tubes, which can greatly increase the surface area of ​​the heat exchange tubes 12, that is, greatly increase the contact area between the heat exchange tubes 12 and the phase change material 13, so that the heat exchange efficiency is significantly improved. The two ends of all the heat exchange tubes 12 are respectively connected to two manifolds 29, and the fluid can be diverted from one manifold 29 to each of the heat exchange tubes 12 and merged in another manifold 29.

[0049] The electric heater 14 is arranged crosswise with each of the heat exchange tubes 12 so as to uniformly heat the heat exchange tubes 12. The phase change material 13 has the characteristics of absorbing heat and liquefying at high temperature and solidifying and releasing heat at low temperature.

[0050] The phase change material 13 can be flexibly selected according to the actual working environment of the electrical cabinet, that is, the phase change temperature range of the phase change material 13 is determined according to the temperature when the cabinet 1 needs to be heated, and then a suitable phase change material 13 is selected according to the phase change temperature range, such as selecting from the ternary eutectic phase change material 13. When the phase change material 13 is actually arranged, attention should be paid to the volume change caused by the phase change of the phase change material 13, so that the phase change material 13 does not completely fill the heat storage tank 3, and some space is reserved in the heat storage tank 3.

[0051] The circulation pipeline includes a first water inlet pipe 15, a first water return pipe 22, a second water inlet pipe 18, a second water return pipe 19, a first electromagnetic three-way valve 16, a second electromagnetic three-way valve 20 and a circulation pump 17. The outside of the circulation pipeline is wrapped with insulation materials such as insulation cotton to reduce heat loss.

[0052] The liquid storage tank, the first water inlet pipe 15, the first electromagnetic three-way valve 16, the circulation pump 17, the second water inlet pipe 18, the heat exchange pipe 12, the second water return pipe 19, the second electromagnetic three-way valve 20 and the first water return pipe 22 are connected in sequence to form a first circulation loop, where the second water inlet pipe 18 and the second water return pipe 19 are respectively connected to the two conduits 29.

[0053] And the first electromagnetic three-way valve 16 and the second electromagnetic three-way valve 20 are respectively connected to the heat exchanger 5, so that the first electromagnetic three-way valve 16, the circulation pump 17, the second water inlet pipe 18, the heat exchange pipe 12, the second water return pipe 19, the second electromagnetic three-way valve 20 and the heat exchanger 5 form a second circulation loop.

[0054] The controller 4 is respectively connected to the first temperature sensor 26, the second temperature sensor 8, the third temperature sensor 21, the first electromagnetic three-way valve 16, the second electromagnetic three-way valve 20, the circulation pump 17 and the electric heater 14. The controller 4 controls the connection and disconnection of the first circulation pipeline and the second circulation pipeline, the solar collector 7 heats the heat transfer oil in the liquid storage tank 2, and the controller 4 controls the circulation pump 17 to pump the heat transfer oil to the heat exchange tube 12 to heat the phase change material 13, so that the solar energy absorbed by the heat transfer oil in the liquid storage tank 2 is used to heat the phase change material, and the phase change material 13 stores heat; and after the phase change material 13 heats the heat transfer oil by phase change and heat release, the circulation pump 17 is controlled to pump the heat transfer oil to the heat exchanger 5 to heat the inside of the cabinet, and the inner cabinet 9 is heated by the phase change material, so that the inside of the cabinet has a long-term heat preservation effect.

[0055] Considering that power outage in an extremely cold environment will make the insulation effect of the electrical cabinet for heat preservation, heating and heat storage in extremely cold areas ineffective, resulting in electrical component failure. The electrical cabinet for heat preservation, heating and heat storage in extremely cold areas also includes a backup battery 27 and a dual power automatic conversion switch, and the controller 4 is connected to the backup battery 27 through the dual power automatic conversion switch. Generally, a circuit board 6 is provided inside the electrical cabinet, and the controller 4 and the dual power automatic conversion switch are integrated on the circuit board 6. The circuit board 6 is connected to the working power supply. When the working power supply fails, the dual power automatic conversion switch automatically switches to the backup power supply.

[0056] And, if Figure 6 As shown, an embodiment of the present invention also provides the above-mentioned control method for the insulation, heating, and heat storage electrical cabinet in extremely cold areas, comprising the following steps:

[0057] S1, the controller 4 obtains the internal temperature of the inner cabinet 9, the temperature of the heat transfer oil in the liquid storage tank 2 and the temperature of the phase change material 13 through the first temperature sensor 26, the second temperature sensor 8 and the third temperature sensor 21. Whether the cabinet 1 needs to be heated is determined according to the internal temperature of the inner cabinet 9. Generally, heating is required when the internal temperature of the inner cabinet 9 is lower than the minimum working temperature of the electrical components.

[0058] S2. When the controller 4 determines that the temperature of the heat transfer oil in the liquid storage tank 2 rises to the first set temperature, it controls the first electromagnetic three-way valve 16 and the second electromagnetic three-way valve 20 to connect the first circulation loop, and controls the circulation pump 17 to pump the heat transfer oil in the liquid storage tank to the heat exchange tube 12. When the heat transfer oil flows through the heat exchange tube 12, it heats the phase change material 13 in the heat storage tank 3.

[0059] Specifically, generally after the sun rises on a sunny day, solar energy is converted into heat of the phase change material 13 for heat storage: sunlight shines on the solar collector 7 to heat the heat transfer oil in the liquid storage tank 2, and the temperature of the heat transfer oil rises. When the temperature of the heat transfer oil in the liquid storage tank 2 rises to a first set temperature, the controller 4 controls the first electromagnetic three-way valve 16 to connect the first water inlet pipe 15 and the second water inlet pipe 18, and the second electromagnetic three-way valve 20 to connect the first return pipe 22 and the second return pipe 19, that is, the first circulation loop is connected, and the circulation pump 17 is controlled to start, so that the heat transfer oil in the liquid storage tank is sucked into the heat exchange tube 12 to heat the phase change material 13.

[0060] It should be noted that if the temperature is too low during the daytime on a sunny day and the temperature inside the inner cabinet 9 is lower than the second set temperature, the step S2 further includes: when the controller 4 determines that the temperature of the heat transfer oil in the liquid storage tank 2 rises to the first set temperature and the temperature inside the inner cabinet 9 is lower than the second preset temperature, the second circulation loop is controlled to be connected. At this time, the first circulation loop and the second circulation loop are connected at the same time, and the solar energy partially heats the phase change material 13 for energy storage and partially directly heats the inner cabinet 9. The second set temperature is generally determined according to the lowest operating temperature of the electrical components that need to be installed inside the inner cabinet 9.

[0061] S3. When the controller 4 determines that the internal temperature of the inner cabinet 9 is lower than the second set temperature, it controls the first electromagnetic three-way valve 16 and the second electromagnetic three-way valve 20 to connect the second circulation loop, and controls the circulation pump 17 to pump the heat transfer oil heated by the phase change material 13 to the heat exchanger 5. The heat transfer oil heats the inner cabinet 9 when flowing through the heat exchanger 5.

[0062] Specifically, when there is no sunlight at night, the temperature inside the inner cabinet 9 gradually decreases. When the temperature inside the inner cabinet 9 is lower than the second set temperature, it should be noted that when the temperature inside the inner cabinet 9 is close to the second set temperature, the temperature is lower than the phase change temperature of the phase change material 13. The phase change material 13 solidifies and releases heat to heat the heat transfer oil. The controller 4 controls the first electromagnetic three-way valve 16 to connect one end of the heat exchanger 5 with the second water inlet pipe 18, and the second electromagnetic three-way valve 20 to connect the other end of the heat exchanger 5 with the second water return pipe 19, that is, the second circulation loop is connected, and the circulation pump 17 is controlled to start, and the heat transfer oil heated by the phase change material 13 is sucked into the heat exchanger 5 to heat the inner cabinet 9. The second circulation loop continues to work to suck the heat transfer oil into the heat exchanger 5 to continuously heat the inner cabinet 9.

[0063] In order to improve the heat exchange efficiency of the heat exchanger 5, the controller 4 can also control the fan to start when the second circulation loop is connected, and the fan blows air to the heat exchanger 5 to accelerate the airflow into the inner cabinet 9, thereby improving the heat exchange effect and making the temperature in the cabinet tend to be evenly distributed.

[0064] S4. When the controller 4 determines that the temperature of the phase change material 13 is lower than the third set temperature, the controller 4 controls the electric heater 14 to heat the phase change material 13 and the heat transfer oil, so as to heat the inside of the heat storage tank 3 to a fourth set temperature.

[0065] When the temperature of the phase change material 13 is lower than the third set temperature, it means that the heat of the phase change material 13 is not enough to heat the heat transfer oil. At this time, the electric heater 14 is controlled to heat the phase change material 13 and the heat transfer oil, and the heat storage tank 3 is heated to the fourth set temperature. The fourth set temperature should be higher than the phase change temperature of the phase change material 13. The phase change material 13 liquefies and absorbs heat to store heat. After the heat of the heat transfer oil is consumed, the phase change material 13 solidifies and releases heat, which can supplement the heat of the heat transfer oil and extend the heating time of the heat transfer oil in the inner cabinet 9 through the heat exchanger 5.

[0066] Since the second circulation loop is continuously working, the heat transfer oil heated by the electric heater 14 can be pumped to the heat exchanger 5 to continuously heat the inner cabinet 9. Therefore, it is only necessary to control the phase change material 13 to start when the temperature is lower than the third set temperature and stop when the temperature is higher than the fourth set temperature through the controller 4. This can reduce the working time of the electric heater 14 and reduce energy consumption.

[0067] In this article, the directional words such as front, back, top, and bottom involved are defined by the positions of the parts in the drawings and the positions of the parts relative to each other, just for the sake of clarity and convenience in expressing the technical solution. It should be understood that they are relative concepts and can change accordingly according to different ways of use and placement, and the use of the directional words should not limit the scope of protection claimed in this application.

[0068] In the absence of conflict, the above embodiments and features in the embodiments may be combined with each other. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An electrical cabinet for heat preservation, heating and heat storage in extremely cold areas, characterized by: include A cabinet with a double-layer vacuum structure has an openable sealed door on its front side, and a heat exchanger and a first temperature sensor are arranged inside the cabinet; A liquid storage tank storing heat transfer oil, which is arranged on the top of the cabinet, a solar collector is arranged on the top of the liquid storage tank, and the solar collector is used to heat the heat transfer oil. A second temperature sensor is arranged in the liquid storage tank; A heat storage tank capable of being buried underground, having a heat exchange tube inside, and an electric heater, a phase change material and a third temperature sensor located outside the heat exchange tube; a circulation pipeline, comprising a first circulation loop connecting the liquid storage tank and the heat exchange tube, and a second circulation loop connecting the heat exchange tube and the heat exchanger; and a controller, which is respectively connected to the first temperature sensor, the second temperature sensor and the third temperature sensor to obtain the internal temperature of the cabinet, the temperature of the heat transfer oil in the liquid storage tank and the temperature of the phase change material. The controller is also connected to the first circulation loop and the second circulation loop. The controller is used to control the connection and disconnection of the first circulation pipeline and the second circulation pipeline so that the solar energy absorbed by the heat transfer oil in the liquid storage tank is used to heat the phase change material, and heat the cabinet through the phase change material.

2. The electrical cabinet for heat preservation, heating and heat storage in extremely cold regions as claimed in claim 1, characterized in that: It also includes a backup battery and a dual power automatic transfer switch, and the controller is connected to the backup battery through the dual power automatic transfer switch.

3. The electrical cabinet for heat preservation, heating and heat storage in extremely cold regions as claimed in claim 1, characterized in that: The circulation pipeline includes a first water inlet pipe, a first water return pipe, a second water inlet pipe, a second water return pipe, a first electromagnetic three-way valve, a second electromagnetic three-way valve and a circulation pump, wherein the liquid storage tank, the first water inlet pipe, the first electromagnetic three-way valve, the circulation pump, the second water inlet pipe, the heat exchange pipe, the second water return pipe, the second electromagnetic three-way valve and the first water return pipe are connected in sequence to form a first circulation loop; and the first electromagnetic three-way valve and the second electromagnetic three-way valve are respectively connected to the heat exchanger, so that the first electromagnetic three-way valve, the circulation pump, the second water inlet pipe, the heat exchange pipe, the second water return pipe, the second electromagnetic three-way valve and the heat exchanger form a second circulation loop, and the controller connects the first electromagnetic three-way valve, the second electromagnetic three-way valve, the circulation pump and the electric heater, and the controller is used to control the connection and disconnection of the first circulation pipeline and the second circulation pipeline.

4. The electrical cabinet for heat preservation, heating and heat storage in extremely cold regions as claimed in claim 3, characterized in that: The number of the heat exchange tubes is set to be multiple, and the multiple heat exchange tubes are arranged side by side. The heat exchange tubes are wavy flat tubes, and both ends of all the heat exchange tubes are respectively connected to two manifolds, and the second water inlet pipe and the second water return pipe are respectively connected to the two manifolds.

5. The electrical cabinet for heat preservation, heating and heat storage in extremely cold regions as claimed in claim 1, characterized in that: The top of the cabinet is triangular, and the solar collectors are respectively arranged on two side surfaces of the top of the cabinet.

6. The electrical cabinet for heat preservation, heating and heat storage in extremely cold regions as claimed in claim 1, characterized in that: The outer wall of the cabinet is a heat-insulating plate, and the outside of the circulation pipeline and the outer wall of the heat storage box are wrapped with heat-insulating materials.

7. The electrical cabinet for heat preservation, heating and heat storage in extremely cold regions as claimed in claim 1, characterized in that: An air guide tube is provided at the bottom of the cabinet, and the air guide tube is in a stepped cylinder shape. The heat exchanger is installed on the upper part of the air guide tube. A fan is provided inside the air guide tube. A plurality of air guide plates are provided at the lower part of the air guide tube. An air inlet is provided on the lower outer wall of the air guide tube, and a filter is provided on the inner side of the air inlet.

8. The electrical cabinet for heat preservation, heating and heat storage in extremely cold regions as claimed in claim 1, characterized in that: An air extraction port is arranged on the inner wall of the cabinet.

9. A control method for heat preservation, heating and heat storage electrical cabinets in extremely cold regions as described in any one of claims 1 to 8, characterized in that: The following steps are involved: S1, the controller obtains the internal temperature of the cabinet, the temperature of the heat transfer oil in the liquid storage tank and the temperature of the phase change material through the first temperature sensor, the second temperature sensor and the third temperature sensor; S2, when the controller determines that the temperature of the heat transfer oil in the liquid storage tank rises to the first set temperature, the controller controls the first circulation loop to be connected, and controls the heat transfer oil in the liquid storage tank to flow to the heat exchange tube, and the heat transfer oil heats the phase change material in the heat storage tank when flowing through the heat exchange tube; S3, when the controller determines that the temperature inside the cabinet is lower than the second set temperature, the controller controls the second circulation loop to be connected, and controls the heat transfer oil heated by the phase change material to flow to the heat exchanger, and the heat transfer oil heats the cabinet when flowing through the heat exchanger; S4. When the controller determines that the temperature of the phase change material is lower than the third set temperature, the controller controls the electric heater to heat the phase change material and the heat transfer oil, so as to heat the inside of the heat storage tank to a fourth set temperature.

10. A control method for heat preservation, heating and heat storage electrical cabinets in extremely cold regions as claimed in claim 9, characterized in that: The step S2 also includes: when the controller determines that the temperature of the heat transfer oil in the liquid storage tank rises to a first set temperature, controlling the second circulation loop to be connected.

Images