Intelligent temperature control type low-voltage draw-out switch cabinet

Abstract

The invention relates to the technical field of electric appliance cabinets, in particular to an intelligent temperature control type low-voltage draw-out type switch cabinet which comprises a main body cabinet divided into a front cavity and a rear cavity by a first partition plate, an air duct is installed on the first side wall of the main body cabinet, and an air guide bin, a pre-cooling bin and an air inlet bin are sequentially arranged in the front cavity from top to bottom; a third electric closed air valve is installed between the pre-cooling bin and the air inlet bin, a second electric closed air valve is installed between the pre-cooling bin and the air channel, the air channel is communicated with the outside through a first electric closed air valve, a plurality of fifth ventilation holes are formed in the position, corresponding to the pre-cooling bin, of the first partition plate, and a second heat exchanger is installed in the pre-cooling bin. The second heat exchanger is fixedly connected with the outdoor unit through a fourth pipeline and a third pipeline, and the air guide bin and the rear cavity communicate with the air flue through fans correspondingly. A relatively closed ring can be formed in the cabinet body, intelligent control over the internal temperature is achieved in cooperation with the outdoor unit and the heat exchanger, and the application scene is expanded.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical cabinets, and in particular to an intelligent temperature-controlled low-voltage withdrawable switch cabinet. Background Art

[0002] The withdrawable low-voltage cabinet is a device responsible for completing the control, protection, conversion and distribution of electric energy in the low-voltage power supply system. This type of switch cabinet has strict requirements on the environment, especially the temperature. However, when many withdrawable switch cabinets are used at the same time, these withdrawable switch cabinets are usually placed in the equipment room and an air-conditioning system is installed for the equipment room. When only a small number of withdrawable switch cabinets are used, or even only one, it will be very costly to build a separate equipment room with an air-conditioning system to cool it down. However, the existing withdrawable switch cabinets themselves do not have the ability to adjust the internal operating temperature, which limits their application scenarios. Summary of the invention

[0003] In order to solve the defects in the prior art, the present invention provides an intelligent temperature-controlled low-voltage withdrawable switch cabinet, which is specifically implemented by the following technical solutions: An intelligent temperature-controlled low-voltage withdrawable switch cabinet, comprising a main cabinet divided into a front cavity and a rear cavity by a first partition, a sealing cover is installed at one end of the main cabinet, an air duct is installed on the first side wall of the main cabinet, an air guide bin, a precooling bin and an air inlet bin are sequentially arranged in the front cavity from top to bottom, a plurality of drawers are installed between the precooling bin and the air guide bin, a third electric airtight air valve is installed between the precooling bin and the air inlet bin, a second electric airtight air valve is installed between the precooling bin and the air duct, the air duct is connected to the outside through the first electric airtight air valve, a plurality of fifth ventilation holes are opened at positions corresponding to the first partition and the precooling bin, and the precooling bin is provided with a plurality of airtight air valves. A second heat exchanger is installed inside, and the second heat exchanger is fixedly connected to the fourth pipe and the third pipe respectively through the fifth solenoid valve and the sixth solenoid valve, the third pipe and the fourth pipe are connected with the external unit, the air guide bin and the rear cavity are connected with the air duct through the second air outlet and the first air outlet respectively, the second air outlet and the first air outlet are both equipped with fans, a temperature sensor is installed in the drawer, and an external temperature sensor is installed in the main cabinet, and the external temperature sensor, the temperature sensor, the third electric sealed air valve, the first electric sealed air valve, the second electric sealed air valve, the fifth solenoid valve, the sixth solenoid valve, the fan, and the external unit are all electrically connected to the controller.

[0004] A first heat exchanger is installed between two adjacent drawers, and the first heat exchanger is connected to the third pipe and the fourth pipe through the fifth pipe and the sixth pipe respectively. A third solenoid valve is installed on the fifth pipe, and a fourth solenoid valve is installed on the sixth pipe. The third solenoid valve and the fourth solenoid valve are both electrically connected to the controller.

[0005] The first heat exchanger includes a third ventilation plate fixedly mounted on the main cabinet, a plurality of heat exchange rods are mounted on the bottom of the third ventilation plate, and each of the heat exchange rods is connected to the sixth pipe and the fifth pipe respectively through a liquid inlet branch pipe and a liquid outlet branch pipe.

[0006] The third ventilation plate is provided with a plurality of rows of third ventilation holes, and each row of the third ventilation holes is located between two adjacent heat exchange rods.

[0007] The heat exchange rod includes a rod body in the shape of an isosceles triangle and a third through hole in the middle. A liquid outlet through hole is provided on the first side wall of the rod body, and at least one liquid inlet through hole is provided on the second side wall and the third side wall of the rod body. A second end cover is fixedly installed on the first end of the rod body, and a first end cover is fixedly installed on the second end. A liquid outlet groove and a liquid inlet groove are provided on the second end cover. The liquid outlet groove is connected to the liquid outlet branch pipe through the liquid outlet through hole, and the liquid inlet groove is connected to the liquid inlet branch pipe through the liquid inlet interface. A liquid through groove is provided on the first end cover, and the liquid through groove connects the liquid inlet through hole and the liquid outlet through hole.

[0008] The second side wall and the third side wall of the rod body have the same size, and the first side wall faces the third ventilation plate.

[0009] The two ends of the liquid outlet groove and the two ends of the liquid inlet groove are separated by a first plug plate and a second plug plate respectively, a first slot matching the first plug plate is provided at the connection between the second side wall of the rod body and the first side wall, a second slot matching the second plug plate is provided at the connection between the third side wall of the rod body and the first side wall, and the first slot and the second slot are both located at the first end of the rod body.

[0010] The depths of the liquid outlet groove and the liquid inlet groove are equal, and are both equal to the heights of the first plug board and the second plug board; the depths of the first slot and the second slot are also equal, and are both smaller than the heights of the first plug board and the second plug board.

[0011] The third ventilation plate is provided with flanges on all four sides, and the second end cover, the first end cover and the corresponding flanges are gap-matched.

[0012] A second solenoid valve is installed on the third pipeline, a first solenoid valve is installed on the fourth pipeline, the connection point between the fifth solenoid valve and the fourth pipeline is located between the external unit and the first solenoid valve; the connection point between the sixth solenoid valve and the third pipeline is located between the external unit and the second solenoid valve; the second solenoid valve and the first solenoid valve are electrically connected to the controller.

[0013] The technical solution of the present invention has the following advantages: The low-voltage withdrawable switch cabinet of the present invention cools the medium through an external unit and then pumps it to the second heat exchanger and the first heat exchanger. The controller controls the solenoid valve and the electric closed air valve to operate according to the temperature data, and selects natural wind heat dissipation, heat exchanger heat dissipation, or heat exchanger and natural wind to cooperate in heat dissipation; it can make reasonable choices according to the ambient temperature and internal temperature, has a high degree of intelligence, and has high heat dissipation efficiency. Therefore, it can be used normally even without using an equipment room, which broadens the use scenarios.

[0014] Equipped with multiple first heat exchangers, all of which are equipped with solenoid valves that operate in coordination, the corresponding first heat exchanger can be selected for use according to the local temperature conditions in the cabinet, which can not only improve the heat exchange efficiency but also save energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 for Figure 1 The structural diagram at A in the middle; Figure 3 It is a structural diagram of the cabinet; Figure 4 This is a structural diagram of the main cabinet; Figure 5 The internal structure of the main cabinet Figure 1 ; Figure 6 The internal structure of the main cabinet Figure 2 ; Figure 7 for Figure 5 The structural diagram at B in the middle; Figure 8 for Figure 6 The structural diagram at C in the middle; Fig. 9 for Figure 6 The structural diagram at D in the middle; Fig.10 The structure of the first heat exchanger is shown in FIG. Figure 1 ; Fig.11 The structure of the first heat exchanger is shown in FIG. Figure 2 ; Fig.12 is a schematic diagram of the structure of the heat exchange rod; Fig.13 is a schematic structural diagram of the second end cover; Fig.14 is a schematic structural diagram of a first end cover; Fig.15 is a structural schematic diagram of the first end of the heat exchange rod; Fig.16 This is a structural diagram of a drawer.

[0017] In the figure, 1-external unit, 2-air duct, 3-first sealed door, 4-air intake grille, 5-first pipeline, 6-second pipeline, 7-first electric sealed air valve, 8-main cabinet, 9-second sealed door, 10-second electric sealed air valve, 11-third pipeline, 12-first solenoid valve, 13-second solenoid valve, 14-first air outlet, 15-second air outlet, 16-sealing cover, 17-air guide bin, 18-drawer, 19-precooling bin, 20-fourth pipeline, 21-first partition, 22-first ventilation plate, 23-first heat exchanger, 24-socket, 25-second ventilation plate, 26-second partition, 27-third electric sealed air valve, 28-second heat exchanger, 29-external temperature sensor, 30-slide rail, 31-third solenoid valve, 32-fourth solenoid Valve, 33-fifth pipeline, 34-sixth pipeline, 35-seventh pipeline, 36-eighth pipeline, 37-fifth solenoid valve, 38-sixth solenoid valve, 39-third ventilation plate, 40-turn edge, 41-heat exchange rod, 42-liquid inlet branch pipe, 43-liquid outlet branch pipe, 44-third ventilation hole, 45-rod body, 46-first end cover, 47-second end cover, 48-first cover body, 49-liquid outlet interface, 50-first plug plate, 51-liquid outlet groove, 52-second plug plate, 53-liquid inlet groove, 54-liquid inlet interface, 55-second cover body, 56-liquid groove, 57-second limiting ring, 58-second through hole, 59-liquid outlet through hole, 60-first slot, 61-liquid inlet through hole, 62-third through hole, 63-fourth ventilation hole, 64-roller, 65-handle. DETAILED DESCRIPTION

[0018] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not 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.

[0019] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", 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 modules or elements 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", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0020] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 indirectly connected 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.

[0021] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0022] As attached Figure 1 As shown, the present invention provides an intelligent temperature-controlled low-voltage withdrawable switch cabinet, including a cabinet body and an external unit 1, wherein the external unit 1 serves as a cold source and is connected to multiple heat exchangers located in the cabinet body through pipelines to provide refrigerant to the heat exchangers, thereby realizing cooling inside the cabinet body.

[0023] The external unit 1 in this embodiment is a prior art, for example, a refrigeration device such as a variable frequency external unit of an air conditioner can be used.

[0024] An air duct 2 is installed on one side of the cabinet, and the air duct 2 is used to realize the flow of gas inside the cabinet, so as to keep the temperature inside the cabinet relatively uniform. The air duct 2 is made of high-temperature plate.

[0025] As attached Figure 3 As shown, the cabinet body includes a main cabinet 8 and a sealing cover 16 fixedly installed at one end of the main cabinet 8. The sealing cover 16 is installed with a first sealing door 3.

[0026] The air duct 2 is fixedly mounted on the first side wall of the main cabinet 8. A first air outlet 14 and a second air outlet 15 are provided on the upper portion of the first side wall of the main cabinet 8, and fans are installed at the first air outlet 14 and the second air outlet 15.

[0027] As attached Figure 4 and attached Figure 5As shown, the upper part of the main cabinet 8 is provided with an air guide bin 17, and the lower part is provided with a precooling bin 19 and an air inlet bin. The precooling bin 19 is located at the top of the air inlet bin and is separated by a second partition 26. A plurality of drawers 18 are installed in the main cabinet 8 between the precooling bin 19 and the air guide bin 17, and the plurality of drawers 18 are arranged along the height direction of the main cabinet 8.

[0028] As attached Figure 3 and attached Figure 4 As shown, a sealing plate is fixedly mounted on one side of the pre-cooling chamber 19 facing the sealing cover 16 .

[0029] As attached Figure 5 As shown, a first partition 21 is fixedly installed in the main cabinet 8, and the first partition 21 divides the main cabinet 8 into a front cavity and a rear cavity. The aforementioned air guide bin 17, pre-cooling bin 19, drawer 18 and air inlet bin are all arranged in the front cavity. The rear cavity is used to install wiring and other lines.

[0030] A second sealing door 9 is installed on the rear cavity.

[0031] As attached Figure 1 and attached Figure 2 As shown, an air intake grille 4 is fixedly mounted on one end of the air intake bin away from the rear cavity, and a second dustproof net is also mounted on the air intake grille 4, and the second dustproof net is located in the air intake bin.

[0032] The second air outlet 15 is located in the front cavity, and is used to connect the front cavity and the air duct 2 ; the first air outlet 14 is located in the rear cavity, and is used to connect the rear cavity and the air duct 2 .

[0033] A second ventilation plate 25 is fixedly installed on the top of the pre-cooling chamber 19 , and a first ventilation plate 22 is fixedly installed on the bottom of the air guide chamber 17 ; the aforementioned plurality of drawers 18 are all installed between the first ventilation plate 22 and the second ventilation plate 25 .

[0034] The first ventilation plate 22 is provided with a first ventilation hole, and the second ventilation plate 25 is provided with a second ventilation hole.

[0035] As attached Figure 5 , Attachment Figure 6 and attached Figure 7 As shown, a first ventilation window is provided on the second partition plate 26, and a third electric airtight air valve 27 is fixedly installed at the first ventilation window; when the third electric airtight air valve 27 is opened, the precooling chamber 19 is connected to the air inlet chamber. The third electric airtight air valve 27 is located in the air inlet chamber.

[0036] A second ventilation window connected to the pre-cooling chamber 19 is provided on the first side wall of the main cabinet 8, and a second electric sealed air valve 10 is fixedly installed on the second ventilation window, and the second electric sealed air valve 10 is located in the air duct 2; when the second electric sealed air valve 10 is opened, the pre-cooling chamber 19 is connected to the air duct 2.

[0037] A second heat exchanger 28 is also fixedly mounted on the top of the second partition plate 26 by screws, that is, the second heat exchanger 28 is located in the pre-cooling chamber 19 .

[0038] A plurality of fifth ventilation holes are provided at positions corresponding to the first partition plate 21 and the pre-cooling chamber 19 for connecting the pre-cooling chamber 19 with the rear cavity.

[0039] As attached Figure 6 and attached Fig. 9 As shown, the medium inlet of the second heat exchanger 28 is fixedly connected to the first end of the eighth pipeline 36, and the second end of the eighth pipeline 36 is fixedly connected to the second pipeline 6; the medium outlet of the second heat exchanger 28 is fixedly connected to the first end of the seventh pipeline 35, and the second end of the seventh pipeline 35 is fixedly connected to the first pipeline 5. The second pipeline 6 is connected to the medium inlet of the external unit 1; the first pipeline 5 is connected to the medium outlet of the external unit 1.

[0040] A sixth solenoid valve 38 is installed on the seventh pipeline 35 , and a fifth solenoid valve 37 is installed on the eighth pipeline 36 . The fifth solenoid valve 37 and the sixth solenoid valve 38 are opened and closed synchronously.

[0041] The third pipeline 11 and the fourth pipeline 20 are both fixedly connected to the external unit 1 .

[0042] As attached Figure 6 As shown, a second solenoid valve 13 is installed on the third pipeline 11 , a first solenoid valve 12 is installed on the fourth pipeline 20 , and the first solenoid valve 12 and the second solenoid valve 13 are switched synchronously.

[0043] The connection point between the eighth pipeline 36 and the fourth pipeline 20 is located between the external unit 1 and the first solenoid valve 12 ; the connection point between the seventh pipeline 35 and the third pipeline 11 is located between the external unit 1 and the second solenoid valve 13 .

[0044] As attached Figure 1 and attached Figure 2 As shown, a third ventilation window is provided on the side of the air duct 2 away from the main cabinet 8. A first electric airtight air valve 7 and a first dustproof net are installed on the third ventilation window, wherein the first dustproof net is located inside the air duct 2 and the first electric airtight air valve 7 is located outside the air duct 2; when the first electric airtight air valve 7 is opened, the air duct 2 is connected to the outside.

[0045] In the front cavity between the first ventilation plate 22 and the second ventilation plate 25 , a plurality of first heat exchangers 23 are fixedly installed, and each of the first heat exchangers 23 is located between two adjacent drawers 18 .

[0046] As attached Figure 5 As shown, the first heat exchanger 23 is in a plate shape as a whole and is fixedly installed between the first side wall and the second side wall of the main cabinet 8.

[0047] As attached Figure 6 and attached Figure 8 As shown, the first heat exchanger 23 is connected to the third pipeline 11 and the fourth pipeline 20 through the fifth pipeline 33 and the sixth pipeline 34 respectively.

[0048] The first end of the third pipe 11 is connected to the medium outlet of the external unit 1, and the second end is closed; the first end of the fourth pipe 20 is connected to the medium inlet of the external unit 1, and the second end is closed. Specifically, the third pipe 11 is connected to the medium outlet of the external unit 1 through the first pipe 5, and the fourth pipe 20 is connected to the medium inlet of the external unit 1 through the second pipe 6.

[0049] The third solenoid valve 31 is installed on the fifth pipeline 33 , and the fourth solenoid valve 32 is installed on the sixth pipeline 34 . The third solenoid valve 31 and the fourth solenoid valve 32 are opened and closed synchronously.

[0050] The structure of the first heat exchanger 23 is shown in the attached figure. Fig.10 and attached Fig.11 As shown, it includes a third ventilation plate 39, and the third ventilation plate 39 is provided with a flange 40 on all four sides, which can be used to be fixedly connected to the main cabinet 8, and can also protect several heat exchange rods 41 fixedly installed at the bottom of the third ventilation plate 39 to prevent the heat exchange rods 41 from being bumped.

[0051] The third ventilation plate 39 is provided with a plurality of rows of third ventilation holes 44 .

[0052] Each row of third ventilation holes 44 is located between two adjacent heat exchange rods 41. The length direction of the heat exchange rod 41 is the same as the length direction of the third ventilation plate 39.

[0053] Each heat exchange rod 41 has a liquid inlet branch pipe 42 and a liquid outlet branch pipe 43; wherein the first end of the liquid inlet branch pipe 42 and the first end of the liquid outlet branch pipe 43 are connected to the heat exchange rod 41 through a pipe joint, and the second end of the liquid inlet branch pipe 42 and the second end of the liquid outlet branch pipe 43 are connected to the sixth pipeline 34 and the fifth pipeline 33 through pipe joints respectively.

[0054] After coming out of the external unit 1, the cold medium enters the fourth pipe 20, then passes through the fourth solenoid valve 32 to enter the sixth pipe 34, and then enters the heat exchange rod 41. After heat exchange with the air, it once again returns to the external unit 1 through the liquid outlet branch pipe 43, the fifth pipe 33, and the third pipe 11.

[0055] The structure of the heat exchange rod 41 is shown in the attached Fig.12 As shown, it comprises a rod body 45 with an isosceles triangle cross section, a second end cover 47 is fixedly mounted on a first end of the rod body 45, and a first end cover 46 is fixedly mounted on a second end.

[0056] The structure of the rod body 45 is shown in the attached Fig.15As shown, a third through hole 62 extending along the length direction of the rod body 45 is provided, and the third through hole 62 penetrates the rod body 45, so that the rod body 45 becomes a cylindrical structure with three side walls.

[0057] A liquid outlet through hole 59 is provided on the first side wall of the rod body 45. The liquid outlet through hole 59 extends along the length direction of the rod body 45 and penetrates the rod body 45. There is at least one liquid outlet through hole 59.

[0058] At least one liquid inlet through hole 61 is formed on the second side wall and the third side wall of the rod body 45 . The liquid inlet through hole 61 extends along the length direction of the rod body 45 and penetrates the rod body 45 .

[0059] The second side wall and the third side wall of the rod body 45 have the same size.

[0060] The structure of the second end cover 47 is shown in the attached Fig.13 As shown, the whole is also an isosceles triangle. The second end cover 47 includes a first cover body 48, and a first through hole matching the third through hole 62 is provided in the middle of the first cover body 48. The first cover body 48 is provided with a straight-shaped liquid outlet groove 51 and a V-shaped liquid inlet groove 53; the two ends of the liquid outlet groove 51 and the two ends of the liquid inlet groove 53 are separated by a first plug plate 50 and a second plug plate 52 respectively.

[0061] A first slot 60 is provided at the connection between the second side wall and the first side wall of the rod body 45, and a second slot is provided at the connection between the third side wall and the first side wall; Fig.15 As shown, the first slot 60 and the second slot are both located at the first end of the rod body 45, and the first slot 60 matches the first plug board 50, and the second slot matches the second plug board 52, that is, after the second end cover 47 is installed, the first plug board 50 is tightly inserted in the first slot 60, and the second plug board 52 is tightly inserted in the second slot, so as to avoid mixing of the inlet and outlet liquids. In this embodiment, the depth of the outlet groove 51 is equal to that of the inlet groove 53, which is equal to the height of the first plug board 50 and the second plug board 52; the depth of the first slot 60 is also equal to that of the second slot, and both are smaller than the height of the first plug board 50 and the second plug board 52.

[0062] A liquid outlet interface 49 and a liquid inlet interface 54 are fixedly installed on one side of the first cover body 48 away from the rod body 45, wherein the first end of the liquid outlet interface 49 is connected to the liquid outlet groove 51, and the second end is connected to the liquid outlet branch pipe 43 through a pipe joint; the first end of the liquid inlet interface 54 is connected to the liquid inlet groove 53, and the second end is connected to the liquid inlet branch pipe 42 through a pipe joint.

[0063] The structure of the first end cover 46 is shown in the attached figure Fig.14 As shown, the whole is also an isosceles triangle, including a second cover body 55 , and a second through hole 58 matching the third through hole 62 is provided in the middle of the second cover body 55 .

[0064] The second cover 55 is provided with an annular liquid-passing groove 56, in which a second limiting ring 57 is provided, and the liquid-passing groove 56 matches the rod 45. During installation, the second end of the rod 45 is inserted into the liquid-passing groove 56 and abuts against the second limiting ring 57, and the second limiting ring 57 is used to prevent the rod 45 from excessively extending into the liquid-passing groove 56, causing blockage in the liquid-passing groove 56.

[0065] The cold medium enters the liquid inlet groove 53 through the liquid inlet interface 54, then flows into the liquid inlet through holes 61 of the second and third side walls of the rod body 45, and finally converges into the liquid through groove 56. The cold medium in the liquid through groove 56 converges into the liquid outlet groove 51 through the liquid outlet through hole 59, and flows out from the liquid outlet interface 49.

[0066] During installation, the first side wall of the rod body 45 faces the third ventilation plate 39 and is connected to the third ventilation plate 39 by screws. Of course, only the first end cap 46 and the second end cap 47 can be connected to the third ventilation plate 39 by screws. A gap is left between the first end cap 46 and the second end cap 47 and the corresponding flange 40, so that air can flow through the third through hole 62 and the cold medium can be fully utilized. The second side wall and the third side wall of the rod body 45 are both inclined, which increases the contact area with the cold air and improves the refrigeration effect. At the same time, a trumpet shape is formed between two adjacent rod bodies 45, and the gas will produce a certain compression when flowing between the two rod bodies 45, and the flow rate will be accelerated, so that the airflow can have a better heat dissipation effect on the equipment in the drawer 18 after passing through the third ventilation hole 44.

[0067] As attached Figure 1 and attached Figure 2 As shown, the third pipe 11 , the fourth pipe 20 , the second electric closed air valve 10 , the fifth pipe 33 , the sixth pipe 34 , the third solenoid valve 31 , the fourth solenoid valve 32 , the fifth solenoid valve 37 , and the sixth solenoid valve 38 are all located in the air duct 2 .

[0068] As attached Fig.16 As shown, the drawer 18 is provided with rollers 64 and handles 65, and a slide rail 30 matching the rollers 64 is fixedly installed in the main cabinet 8, that is, the slide rail 30 rolls with the rollers 64. A plurality of fourth ventilation holes 63 are provided at the bottom of the drawer 18.

[0069] A plurality of sockets 24 corresponding to the drawers 18 are fixedly mounted on the first partition plate 21 .

[0070] A temperature sensor is installed in each drawer 18 , and an external temperature sensor 29 is also installed outside the main cabinet 8 .

[0071] The aforementioned external unit 1, temperature sensor, external temperature sensor 29, first electric airtight air valve 7, second electric airtight air valve 10, first solenoid valve 12, second solenoid valve 13, third electric airtight air valve 27, third solenoid valve 31, fourth solenoid valve 32, fifth solenoid valve 37, sixth solenoid valve 38, fan, etc. are all electrically connected to the controller. The controller can be installed on the first sealing door 3, or in the air duct 2, or in other locations.

[0072] During use, the fan is always in operation.

[0073] When the temperature detected by the external temperature sensor 29 is equal to or lower than the set first threshold, the external unit 1 and all the solenoid valves are in a closed state. At this time, the third electric airtight air valve 27 is opened, the second electric airtight air valve 10 is closed, and the first electric airtight air valve 7 is opened. Under the action of the fan, the cold air from the outside enters the air inlet bin from the air inlet grille 4, and then passes through the third electric airtight air valve 27 to enter the pre-cooling bin 19. After entering the pre-cooling bin 19, part of the air enters the rear cavity, and the other part passes through the second ventilation plate 25 and continues to go up to cool the equipment in the front cavity. The heated air enters the air duct 2 under the action of the fan, and then is discharged from the first electric airtight air valve 7, forming natural cooling.

[0074] If the temperature detected by the temperature sensor in a drawer 18 is greater than the preset second threshold value at this time, the external unit 1 is started, the first solenoid valve 12 and the second solenoid valve 13 are opened, and the other solenoid valves are closed. The first heat exchanger 23 at the bottom of the drawer 18 with the temperature exceeding the standard is opened, that is, the third solenoid valve 31 and the fourth solenoid valve 32 corresponding to the first heat exchanger 23 are opened. Of course, the external unit 1 can also be directly started, the fifth solenoid valve 37 and the sixth solenoid valve 38 are opened, and cooling is performed through the second heat exchanger 28.

[0075] When the temperature detected by the external temperature sensor 29 is higher than the set first threshold, the first electric airtight air valve 7 is closed, the third electric airtight air valve 27 is closed, and the second electric airtight air valve 10 is opened. The external unit 1 is turned on, and the fifth solenoid valve 37 and the sixth solenoid valve 38 are opened. The air in the pre-cooling bin 19 is cooled by the second heat exchanger 28. The refrigerated air moves upward under the action of the fan and returns to the pre-cooling bin 19 through the air duct 2 and the second electric airtight air valve 10 to form a cycle. If the temperature detected by the temperature sensor in a drawer 18 is greater than the preset second threshold at this time, the external unit 1 is started, the first solenoid valve 12 and the second solenoid valve 13 are opened, and the other solenoid valves are closed. The first heat exchanger 23 at the bottom of the drawer 18 with excessive temperature is opened, that is, the third solenoid valve 31 and the fourth solenoid valve 32 corresponding to the first heat exchanger 23 are opened. When the temperature sensor in the drawer 18 with excessive temperature detects that the temperature is less than the third threshold, the corresponding third solenoid valve 31 and the fourth solenoid valve 32 are closed. When all the third solenoid valves 31 and the fourth solenoid valves 32 are closed, the first solenoid valve 12 and the second solenoid valve 13 are closed, and only the second heat exchanger 28 is kept refrigerating until the temperature of the drawer 18 exceeds the standard again.

[0076] When the temperature detected by the external temperature sensor 29 is lower than the set first threshold, and the temperatures detected by the temperature sensors in all drawers 18 are lower than the preset second threshold, the external unit 1 and all the solenoid valves are closed.

[0077] Since the drawer 18 at the bottom is directly connected to the pre-cooling chamber 19, the first heat exchanger 23 is no longer installed at the bottom thereof.

[0078] Since the air resistance in the front cavity is relatively large, the total power of the fan installed at the second air outlet 15 is greater than the total power of the fan installed at the first air outlet 14 .

[0079] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. An intelligent temperature-controlled low-voltage withdrawable switch cabinet, characterized in that: The invention comprises a main cabinet (8) which is divided into a front cavity and a rear cavity by a first partition (21), a sealing cover (16) being installed at one end of the main cabinet (8), an air duct (2) being installed on a first side wall of the main cabinet (8), an air guide bin (17), a precooling bin (19) and an air inlet bin being arranged in sequence from top to bottom in the front cavity, a plurality of drawers (18) being installed between the precooling bin (19) and the air guide bin (17), a third electric airtight air valve (27) being installed between the precooling bin (19) and the air inlet bin, a second electric airtight air valve (10) being installed between the precooling bin (19) and the air duct (2), the air duct (2) being connected to the outside world via the first electric airtight air valve (7), a plurality of fifth ventilation holes being opened at positions corresponding to the first partition (21) and the precooling bin (19), a second heat exchanger (28) being installed in the precooling bin (19), and a third electric airtight air valve (27) being installed between the precooling bin (19) and the air inlet bin. The second heat exchanger (28) is fixedly connected to the fourth pipe (20) and the third pipe (11) through a fifth solenoid valve (37) and a sixth solenoid valve (38), respectively; the third pipe (11) and the fourth pipe (20) are in communication with the external unit (1); the air guide chamber (17) and the rear cavity are in communication with the air duct (2) through a second air outlet (15) and a first air outlet (14), respectively; the second air outlet (15) and the first air outlet (14) are both equipped with fans; a temperature sensor is installed in the drawer (18); an external temperature sensor (29) is installed in the main cabinet (8); the external temperature sensor (29), the temperature sensor, the third electric airtight air valve (27), the first electric airtight air valve (7), the second electric airtight air valve (10), the fifth solenoid valve (37), the sixth solenoid valve (38), the fan, and the external unit (1) are all electrically connected to a controller.

2. The intelligent temperature-controlled low-voltage withdrawable switch cabinet according to claim 1 is characterized in that: A first heat exchanger (23) is installed between two adjacent drawers (18); the first heat exchanger (23) is connected to the third pipe (11) and the fourth pipe (20) via a fifth pipe (33) and a sixth pipe (34), respectively; a third solenoid valve (31) is installed on the fifth pipe (33); a fourth solenoid valve (32) is installed on the sixth pipe (34); and the third solenoid valve (31) and the fourth solenoid valve (32) are both electrically connected to a controller.

3. The intelligent temperature-controlled low-voltage withdrawable switch cabinet according to claim 2 is characterized in that: The first heat exchanger (23) comprises a third ventilation plate (39) fixedly mounted on the main cabinet (8), a plurality of heat exchange rods (41) being mounted on the bottom of the third ventilation plate (39), each of the heat exchange rods (41) being connected to the sixth pipeline (34) and the fifth pipeline (33) respectively via a liquid inlet branch pipe (42) and a liquid outlet branch pipe (43).

4. The intelligent temperature-controlled low-voltage withdrawable switch cabinet according to claim 3 is characterized in that: The third ventilation plate (39) is provided with a plurality of rows of third ventilation holes (44), and each row of the third ventilation holes (44) is located between two adjacent heat exchange rods (41).

5. The intelligent temperature-controlled low-voltage withdrawable switch cabinet according to claim 3 is characterized in that: The heat exchange rod (41) comprises a rod body (45) in the shape of an isosceles triangle and provided with a third through hole (62) in the middle thereof; a liquid outlet through hole (59) is provided on a first side wall of the rod body (45); at least one liquid inlet through hole (61) is provided on a second side wall and a third side wall of the rod body (45); a second end cover (47) is fixedly mounted on a first end of the rod body (45); a first end cover (46) is fixedly mounted on a second end of the rod body (45); a liquid outlet groove (51) and a liquid inlet groove (53) are provided on the second end cover (47); the liquid outlet groove (51) is connected to a liquid outlet branch pipe (43) via the liquid outlet through hole (59); the liquid inlet groove (53) is connected to a liquid inlet branch pipe (42) via a liquid inlet interface (54); a liquid through groove (56) is provided on the first end cover (46); the liquid through groove (56) is connected to the liquid inlet through hole (61) and the liquid outlet through hole (59).

6. The intelligent temperature-controlled low-voltage withdrawable switch cabinet according to claim 5 is characterized in that: The second side wall and the third side wall of the rod body (45) have the same size, and the first side wall faces the third ventilation plate (39).

7. The intelligent temperature-controlled low-voltage withdrawable switch cabinet according to claim 5 is characterized in that: The two ends of the liquid outlet groove (51) and the two ends of the liquid inlet groove (53) are separated by a first plug plate (50) and a second plug plate (52) respectively; a first slot (60) matching the first plug plate (50) is provided at the connection between the second side wall of the rod body (45) and the first side wall; a second slot matching the second plug plate (52) is provided at the connection between the third side wall of the rod body (45) and the first side wall; and both the first slot (60) and the second slot are located at the first end of the rod body (45).

8. The intelligent temperature-controlled low-voltage withdrawable switch cabinet according to claim 7 is characterized in that: The depths of the liquid outlet groove (51) and the liquid inlet groove (53) are equal, and are both equal to the heights of the first plug plate (50) and the second plug plate (52); the depths of the first slot (60) and the second slot are also equal, and are both smaller than the heights of the first plug plate (50) and the second plug plate (52).

9. The intelligent temperature-controlled low-voltage withdrawable switch cabinet according to claim 5 is characterized in that: The third ventilation plate (39) is provided with flanges (40) on all four sides, and the second end cover (47), the first end cover (46) and the corresponding flanges (40) are clearance-matched.

10. The intelligent temperature-controlled low-voltage withdrawable switch cabinet according to claim 2 is characterized in that: A second solenoid valve (13) is installed on the third pipeline (11), a first solenoid valve (12) is installed on the fourth pipeline (20), a connection point between the fifth solenoid valve (37) and the fourth pipeline (20) is located between the external unit (1) and the first solenoid valve (12); a connection point between the sixth solenoid valve (38) and the third pipeline (11) is located between the external unit (1) and the second solenoid valve (13); and the second solenoid valve (13) and the first solenoid valve (12) are electrically connected to a controller.

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