Structure for applying backward-tilting centrifugal fan to split type direct current charging pile main machine

Abstract

The utility model discloses a structure for applying a backward-tilting centrifugal fan to a split type direct current charging pile main machine, which enables the structure for installing the fan to be simple and the fan to be simple and convenient to disassemble and assemble. The host comprises a host cabinet body; the top cover comprises peripheral surrounding plates and a cover plate, the peripheral surrounding plates specifically comprise a front panel, a rear panel and two side plates, the cover plate is arranged at the top of the central area of the peripheral surrounding plates, at least one of the peripheral surrounding plates is provided with a ventilation dustproof structure, the ventilation dustproof structure is used for exhausting hot air, and the fan is a backward-inclined centrifugal fan. Air enters from the bottom of the fan, and air exits from the outer circumference of the fan; the fan mounting unit is used for fixedly mounting a fan, the fan mounting unit comprises a bottom plate, and the central area of the bottom plate is a hollow surface area.

Description

Technical Field

[0001] The utility model relates to the technical field of the structure of a DC charging pile host, in particular to a structure in which a backward-inclined centrifugal fan is applied to a split-type DC charging pile host. Background Technique

[0002] A DC charging pile is a high-power DC charging device for charging the power battery of a new energy electric vehicle. At present, DC charging piles are mainly divided into two categories: integrated DC charging piles and split-type DC charging piles. When the rated power of a DC charging pile reaches more than 300 kW, the DC charging pile is generally made into a split-type DC charging pile. The split-type DC charging pile includes a split-type DC charging pile host and a supporting DC charging terminal. Inside the split-type DC charging pile host, a relatively large number of DC charging modules, electrical components in the power distribution part, electrical components in the power main circuit part, electrical components in the control circuit part, etc. are mainly installed.

[0003] When the split-type DC charging pile host is working, the DC charging modules and the electrical components in the power distribution part generate serious heat. When designing the structure of the product, a good heat dissipation structure must be considered to control the temperature rise of the whole machine within a certain range. Since the split-type DC charging pile host concentrates the heat-generating electrical components, a good heat dissipation structure design is necessary. The split-type DC charging pile host is divided into air-cooling and liquid-cooling according to the heat dissipation method. Air-cooling is further divided into centrifugal fan air-cooling type and axial flow fan air-cooling type.

[0004] At present, the air-cooling heat dissipation structure of the split-type DC charging pile host on the market is still the mainstream. Among them, the air flow driving part in the air duct uses an axial flow fan. Due to the small air pressure and poor heat dissipation efficiency of the axial flow fan, the proportion in the industry development trend is shrinking; at present, the industry gradually uses a backward-inclined centrifugal fan to replace the axial flow fan. Due to the large air pressure and good heat dissipation efficiency of the backward-inclined centrifugal fan, the proportion in the future development trend will be larger and larger. The backward-inclined centrifugal fan has a large air volume and a large air pressure. When the air volume is above 3000 m 3 / H, the backward-inclined centrifugal fan becomes large in volume and more cumbersome.

[0005] When the air pressure of the backward-inclined centrifugal fan is set at the top of the DC charging pile, for the existing installation method, first remove the top cover, then install the backward-inclined centrifugal fan to the top with structural parts, fix it with fasteners, and finally lift the top cover up or use an electric hoist to hoist it up to cover the backward-inclined centrifugal fan, and fix the top cover firmly with fasteners. The defect of this conventional installation method is that the installation process is cumbersome, laborious and time-consuming. Before installing the backward-inclined centrifugal fan, at least two people need to cooperate to first lift the top cover down or use an electric hoist to lift it down. After resetting the backward-inclined centrifugal fan, at least two people need to cooperate to lift the top cover up and cover it or use an electric hoist to lift it up and cover it. In addition, some structural parts of the conventional backward-inclined centrifugal fan unit are bulky, and the disassembly and assembly process is laborious and time-consuming. Summary of the Invention

[0006] In view of the above problems, the utility model provides a structure of an inclined-back centrifugal fan applied to a split DC charging pile host, which makes the structure for installing the fan simple, and the disassembly and assembly of the fan are convenient.

[0007] A structure of an inclined-back centrifugal fan applied to a split DC charging pile host, characterized in that it includes:

[0008] A main cabinet body;

[0009] A top cover, which includes a surrounding plate and a cover plate. The surrounding plate specifically includes a front panel, a rear panel and two side panels. A cover plate is arranged at the top of the central area of the surrounding plate. At least one plate of the surrounding plate is provided with a ventilation and dust-proof structure, and the ventilation and dust-proof structure is used to discharge hot air.

[0010] A fan, which is an inclined-back centrifugal fan. The bottom of the fan is for air intake, and the outer circumference is for air outlet;

[0011] And a fan installation unit, which is used to fixedly install the fan. The fan installation unit includes a bottom plate, and the central area of the bottom plate is a hollow area;

[0012] A convex fan installation seat is arranged at the center of the top plate of the main cabinet body. The central area of the fan installation seat is a vertical through space. The bottom plate of the fan installation unit is fixedly installed on the fan installation seat. The vertical through space conducts the heat in the main cabinet body into the bottom air intake area of the fan through the hollow area;

[0013] The bottom of the rear panel of the top cover is connected to the rear end of the top of the main cabinet body through a hinge structure. Guide telescopic rod mechanisms are respectively arranged between the two side panels of the top cover and the two sides of the top of the main cabinet body.

[0014] It is further characterized in that:

[0015] Guide rail grooves are arranged convexly on both sides of the fan installation seat. The track spaces of the two groups of guide rail grooves are arranged facing each other. Each group of guide rail grooves includes a lower connecting plate, an outer connecting plate and an upper connecting plate. Convex side supports are respectively fixedly installed on both sides of the bottom plate of the fan installation unit. The two convex side supports of the fan installation unit are installed in the corresponding guide rail grooves during installation to ensure that the fan installation unit will not derail during the assembly process;

[0016] A stop edge is arranged at the rear end of the fan installation seat. A convex conical guide is arranged on the front vertical surface of the stop edge. A corresponding positioning hole is arranged on the rear vertical surface of the bottom plate. The conical guide is inserted into the positioning hole to complete the stop positioning of the bottom plate and the fan installation seat;

[0017] A positioning plate is fixedly installed at the front end of the bottom plate. Positioning connection holes are provided on the positioning plate. Locking holes corresponding to the positioning connection holes are provided on the front end plate of the fan mounting base. Locking screws penetrate the positioning connection holes of the positioning plate and are locked to the corresponding locking holes of the front end plate to ensure the stable and reliable arrangement of the fan installation unit.

[0018] The fan installation unit further includes a top sheet metal block and a plurality of connecting round tubes. The top sheet metal block is fixedly connected to the top position of the fan through fasteners. The outer circumference of the top sheet metal block is fixedly connected to the upper ends of the evenly distributed connecting round tubes. The lower ends of the connecting round tubes are fixedly connected to the corresponding positions of the bottom plate. The bottom of the fan is fixedly connected to the corresponding position of the bottom plate.

[0019] The top plate is further provided with a protruding cable threading pipe. The cable of the fan is connected to the power supply in the main cabinet through the cable threading pipe.

[0020] Ventilation and dust-proof structures are provided on both the front panel and the rear panel.

[0021] The ventilation and dust-proof structure includes movable self-hanging louvers, fixed-angle louvers, and stainless steel wire meshes arranged from the inside to the outside. When the fan does not blow outwards, the movable self-hanging louvers automatically close the air outlet to prevent the intrusion of external dust and water vapor. The fixed-angle louvers prevent rainwater from splashing into the pile interior. The stainless steel wire mesh prevents the entry of external insects and small animals.

[0022] The guiding telescopic rod mechanism includes a guiding rod and a locking connection seat. The guiding rod is pivotally connected to the inner wall of the corresponding side plate of the top cover. The bottom of the locking connection seat is pivotally connected to the protruding connection seat on the top plate. The guiding rod is inserted into the track groove of the locking connection seat. A guiding locking groove is further provided on the locking connection seat. The locking protrusion of the guiding rod is fitted into the guiding locking groove. The guiding locking groove includes a linear guiding groove and a plurality of branch locking grooves.

[0023] When the top cover is opened upwards, the guiding telescopic rod mechanism composed of the guiding rod and the locking connection seat is pulled and elongated. When the top cover pauses, the locking protrusion of the guiding rod is fitted into the non-branch locking groove at the corresponding position, and it is in a limit self-locking state. When released, the top cover will not fall downwards in the reverse direction. When the guiding telescopic rod mechanism composed of the guiding rod and the locking connection seat is stretched to the longest state, at this time, the top cover rotates upwards to the maximum angle.

[0024] After adopting the structure of the present utility model, air inlets are provided on the front door and the rear door of the main cabinet body. A fan installation unit is installed inside the top cover. The fan is fixedly installed on the fan installation unit. The fan sucks air outwards. See Figure 1For the air flow direction of the whole machine, the top cover rotates upward and opens at a certain angle. With the hinge structure as the fulcrum, the top cover rotates upward and opens. When the top cover opens upward, the telescopic rod mechanism is pulled and elongated; when the telescopic rod mechanism pauses, the telescopic rod mechanism is in a limit self-locking state, and the top cover will not fall back when released. The fan is installed on the fan installation unit, and then the fan installation unit together with the fan is installed on the fan installation seat of the main cabinet body, which makes the structure for installing the fan simple and the disassembly and assembly of the fan convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a side view of the split DC charging pile main body corresponding to the utility model;

[0026] Figure 2 It is a three-dimensional view of the split DC charging pile main body with the top cover opened at a certain angle of the utility model;

[0027] Figure 3 For Figure 2 explosion schematic diagram in the state;

[0028] Figure 4 For Figure 3 partial enlarged schematic diagram at position A of

[0029] Figure 5 For Figure 3 partial enlarged schematic diagram at position B of

[0030] Figure 6 It is a partial cross-sectional view of the top cover of the present utility model;

[0031] Figure 7 For Figure 6 partial enlarged schematic diagram at position C of

[0032] Figure 8 It is an assembled explosion schematic diagram of the fan and the fan installation unit of the present utility model;

[0033] Figure 9 It is a schematic diagram for separately overhauling one fan when multiple split DC charging pile main bodies are combined in a cabinet; the names corresponding to the numbers in the figure are as follows:

[0034] Top cover 1, front door 2, rear door 3, fan installation unit 4, fan 5, handle 6, hinge structure 7, guiding telescopic rod mechanism 8, guiding rod 81, locking projection 811, locking connection seat 82, guiding locking groove 83, linear guiding groove 831, branch locking groove 832, cable conduit 9, guide rail groove 10, conical guiding member 11, fixed angle louver 12, movable self-hanging louver 13, top sheet metal block 14, stainless steel wire mesh 15, screw 16, bottom plate 17, positioning plate 171, positioning connection hole 172, side convex support foot 18, screw 19, bottom air collecting cover 20, connecting round pipe 21;

[0035] The main body cabinet 100, the top plate 101, the upward convex connecting seat 102, the fan mounting seat 110, and the locking hole 111. Specific embodiments

[0036] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0037] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is 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 thus should not be construed as a limitation to the present invention. In the description of the present invention, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly defined and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

[0039] The present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0040] The structure of a backward-inclined centrifugal fan applied to the main body of a split DC charging pile, as shown in Figures 1-9 , which includes a main body cabinet 100, a top cover 1, a fan, and a fan installation unit 4;

[0041] Air inlets are provided on both the front door 2 and the rear door 3 of the main body cabinet 100.

[0042] The top cover 1 includes a surrounding plate and a cover plate. The surrounding plate specifically includes a front panel, a rear panel, and two side panels. The cover plate is fixedly installed at the top of the central area of the surrounding plate. At least one plate of the surrounding plate is provided with a ventilation and dust-proof structure, and the ventilation and dust-proof structure is used to discharge hot air.

[0043] The fan 5 is a backward-inclined centrifugal fan. The bottom of the fan 5 is for air intake, and the outer circumference is for air outlet.

[0044] The fan installation unit 4 is used for fixedly installing the fan 5. The fan installation unit 4 includes a bottom plate 17, and the central area of the bottom plate 17 is a hollow area;

[0045] In the center of the top plate 101 of the main cabinet body 100, there is a protruding fan mounting seat 110. The central area of the fan mounting seat 110 is a vertical through space. The bottom plate 17 of the fan installation unit 4 is fixedly installed on the fan mounting seat 110. The heat inside the main cabinet is conducted into the bottom air inlet area of the fan 5 through the hollow area and the vertical through space;

[0046] The bottom of the rear panel of the top cover 1 is connected to the rear end of the top of the main cabinet body 100 through a hinge structure 7. Guide telescopic rod mechanisms 8 are respectively arranged between the two side plates of the top cover 1 and the two sides of the top of the main cabinet body.

[0047] In a specific embodiment, on both sides of the fan mounting seat 110, there are protruding guide rail grooves 10. The track spaces of the two groups of guide rail grooves 10 are arranged facing each other. Each group of guide rail grooves 10 includes a lower connecting plate, an outer connecting plate, and an upper connecting plate. On both sides of the bottom plate 17 of the fan installation unit 4, side protruding support feet 18 are fixedly installed respectively. When installing, the two side protruding support feet 18 of the fan installation unit 4 are embedded in the corresponding guide rail grooves 10 to ensure that the fan installation unit 4 will not derail during the assembly process;

[0048] At the rear end of the fan mounting seat 110, there is a stop edge. On the front vertical surface of the stop edge, there is a protruding conical guide 11. On the rear vertical surface of the bottom plate 17, there is a corresponding positioning hole. The conical guide 11 is inserted into the positioning hole to complete the stop positioning of the bottom plate 17 and the fan mounting seat 110;

[0049] At the front end of the bottom plate 17, a positioning plate 171 is fixedly installed. On the positioning plate 171, there are positioning connection holes 172. At the position corresponding to the positioning connection holes on the front end plate of the fan mounting seat 110, there are locking holes 111. The locking screw passes through the positioning connection hole 172 of the positioning plate 171 and then locks to the corresponding locking hole 111 on the front end plate to ensure the stable and reliable arrangement of the fan installation unit 4;

[0050] The fan installation unit 4 further includes a top sheet metal block 14 and a number of connecting round tubes 21. The top sheet metal block 14 is fixedly connected to the top position of the fan 5 through screws 16. The outer circumference of the top sheet metal block 14 is fixedly connected to the upper ends of the uniformly distributed connecting round tubes 21. The lower ends of the connecting round tubes 21 are fixedly connected to the corresponding positions of the bottom plate 17. The bottom of the fan 5 is fixedly connected to the corresponding position of the bottom plate 17;

[0051] The top plate 101 is also provided with a protruding cable conduit 9. The cable of the fan 5 is connected to the power supply inside the main cabinet body 100 through the cable conduit 9;

[0052] The front panel and the rear panel are both provided with ventilation and dust-proof structures. The ventilation and dust-proof structures include movable self-hanging louvers 13, fixed-angle louvers 12, and stainless steel wire meshes 15 arranged from inside to outside. When the fan 5 does not blow air outwards, the movable self-hanging louvers 13 automatically close the air outlet to prevent the intrusion of external dust and water vapor. The fixed-angle louvers 12 prevent rainwater from splashing into the pile interior, and the stainless steel wire meshes 15 prevent the entry of external insects and small animals.

[0053] The guiding telescopic rod mechanism 8 includes a guiding rod 81 and a locking connection seat 82. The guiding rod 81 is pivotally connected to the inner wall of the corresponding side plate of the top cover 1. The bottom of the locking connection seat 82 is pivotally connected to the upward convex connection seat 102 of the top plate 101. The guiding rod 81 is inserted into the track groove of the locking connection seat 82. The locking connection seat 82 is also provided with a guiding locking groove 83. The locking protrusion 811 of the guiding rod 81 is fitted into the guiding locking groove 83. The guiding locking groove 83 includes a linear guiding groove 831 and a plurality of branch locking grooves 832.

[0054] In a specific embodiment, a handle 6 is further provided at the lower part of the front panel of the top cover 1. By pulling the handle 6 upwards with force, the top cover 1 can be rotated upwards by a maximum of 40° with the hinge structure 7 as the fulcrum. When the top cover 1 is opened upwards, the guiding telescopic rod mechanism 8 composed of the guiding rod 81 and the locking connection seat 82 is pulled and elongated. When the top cover 1 pauses, the locking protrusion 811 of the guiding rod 81 is fitted into the non-branch locking groove 832 at the corresponding position, being in a limit self-locking state. When the hand is released, the top cover 1 will not fall down in the reverse direction. When the guiding telescopic rod mechanism 8 composed of the guiding rod 81 and the locking connection seat 82 is stretched to the longest state, at this time, the top cover 1 is rotated upwards to the maximum angle. The cable threading pipe 9 is used for threading the cables of the fan 5. Through this cable threading pipe 9, the power cord of the fan 5 can be connected to the corresponding port position inside the pile. It should be noted that before pulling the fan 5 out of the track groove 10, the power cord of the fan 5 needs to be loosened and pulled out from the cable threading pipe 9.

[0055] A hinge structure 7 is provided at the rear side of the top cover 1. The top cover 1 can be rotated and opened with the hinge structure 7 as the rotation axis by applying an upward external force on the handle.

[0056] The fan 5 can extract the hot air inside the pile and discharge it outwards, as shown in Figure 1 the air flow direction in. The main body of the fan 5 is fixed with screws 16 by a structural member composed of a top sheet metal block 14 and 4 round steel pipes 21. The selected round steel pipes 21 are not solid round steel, in order to reduce the overall weight of the fan installation unit 4 and at the same time minimize the wind resistance at the air outlet of the fan 5. The bottom air collecting hood 20 of the fan 5 is directly fastened to the bottom plate 17 with screws. The bottom of the round steel pipe 21 is fixed to the bottom plate 17 with screws 19. SUS304 stainless steel side convex feet 18 are provided on the left and right sides of the bottom plate 17, which can be placed in the track groove 10 to slide.

[0057] Figure 9 When multiple split - type DC charging pile hosts are installed in a cabinet, when separately maintaining the fan 5 of one of them, the adjacent hosts are not affected. When maintaining the fan 5 of the host in the middle, only need to open the top cover to expose the fan 5, or remove the power cord of the fan, then it is convenient to maintain without affecting the adjacent hosts.

[0058] This backward - inclined centrifugal fan adopts a simple installation structure, which can make the operation of the backward - inclined centrifugal fan more labor - saving. Its beneficial effects are as follows:

[0059] 1) Disassembly and assembly can be simplified to single - person operation, improving production efficiency. Conventionally, 2 or more people are required to first lift down the large and heavy top cover, and then carry and install the backward - inclined centrifugal fan onto the charging pile.

[0060] 2) Improve the operation and maintenance efficiency. When operating and maintaining the stations, only need to rotate the top cover to open it at a certain angle, and one person can disassemble the backward - inclined centrifugal fan. There is no need for two people to directly disassemble the top cover to disassemble the backward - inclined centrifugal fan, which simplifies the cumbersome disassembly and assembly of the top cover, reduces the operation and maintenance cost, and improves the efficiency.

[0061] 3) The structure of some components of the fan installation unit is simplified, saving materials, reducing weight, and lowering the processing technology. Using round tubes as the framework, the weight is reduced by at least 50%, and threads can be directly tapped on the inner diameter of the round tube for fastening screws.

[0062] 4) When multiple split - type DC charging pile hosts are installed in a cabinet, when separately maintaining the backward - inclined centrifugal fan of one of them, the adjacent hosts are not affected.

[0063] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above - mentioned exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, in any aspect, the embodiments should be regarded as exemplary and non - restrictive. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be encompassed by the present utility model. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0064] In addition, it should be understood that although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. Structure of a backward-inclined centrifugal fan applied to a split-type DC charging pile host, characterized in that, It includes: The main body cabinet; The top cover, which includes a surrounding plate and a cover plate. The surrounding plate specifically includes a front panel, a rear panel, and two side panels. The cover plate is arranged at the top of the central area of the surrounding plate. At least one of the surrounding plates is provided with a ventilation and dust-proof structure, and the ventilation and dust-proof structure is used to discharge hot air. The fan, which is a backward-inclined centrifugal fan. The bottom of the fan is for air intake, and the outer circumference is for air outlet. And a fan installation unit, which is used to fixedly install the fan. The fan installation unit includes a bottom plate, and the central area of the bottom plate is a hollow area. A fan mounting seat protruding upward is provided at the center of the top plate of the main body cabinet. The central area of the fan mounting seat is a vertically penetrating space. The bottom plate of the fan installation unit is fixedly installed on the fan mounting seat. The vertically penetrating space conducts the heat in the main body cabinet into the bottom air intake area of the fan through the hollow area. The bottom of the rear panel of the top cover is connected to the top rear end of the main body cabinet through a hinge structure. Guide telescopic rod mechanisms are respectively arranged between the two side panels of the top cover and the two sides of the top of the main body cabinet.

2. The structure of a backward-inclined centrifugal fan applied to the main unit of a split-type DC charging pile according to claim 1, wherein: Guide rail grooves protruding upward are provided on both sides of the fan mounting seat. The track spaces of the two groups of guide rail grooves are arranged facing each other. Each group of guide rail grooves includes a lower connecting plate, an outer connecting plate, and an upper connecting plate. Side convex support feet are respectively fixedly installed on both sides of the bottom plate of the fan installation unit. The two side convex support feet of the fan installation unit are installed in the corresponding guide rail grooves during installation.

3. The structure of a backward-inclined centrifugal fan applied to the main unit of a split-type DC charging pile according to claim 2, wherein: A stop edge is provided at the rear end of the fan mounting seat. A conical guide protruding forward is provided on the front vertical surface of the stop edge. A corresponding positioning hole is provided on the rear vertical surface of the bottom plate. The conical guide is inserted into the positioning hole to complete the stop positioning of the bottom plate and the fan mounting seat.

4. The structure of a backward-inclined centrifugal fan applied to a split-type DC charging pile main unit according to claim 3, wherein: A positioning plate is fixedly installed at the front end of the bottom plate. A positioning connection hole is provided on the positioning plate. A locking hole is provided at the position corresponding to the positioning connection hole on the front end plate of the fan mounting seat. The locking screw passes through the positioning connection hole of the positioning plate and is locked to the corresponding locking hole of the front end plate.

5. The structure of a backward-inclined centrifugal fan applied to a split-type DC charging pile host according to claim 1, characterized in that: The fan installation unit further includes a top sheet metal block and a plurality of connecting round tubes. The top sheet metal block is fixedly connected to the top position of the fan through fasteners. The outer circumference of the top sheet metal block is fixedly connected to the upper ends of the evenly distributed connecting round tubes. The lower ends of the connecting round tubes are fixedly connected to the corresponding positions of the bottom plate. The bottom of the fan is fixedly connected to the corresponding position of the bottom plate.

6. The structure of a backward-inclined centrifugal fan applied to a split-type DC charging pile main unit according to claim 1, wherein: The top plate is also provided with a cable conduit protruding upward. The cable of the fan is connected to the power supply in the main body cabinet through the cable conduit.

7. The structure of a backward-inclined centrifugal fan applied to a split-type DC charging pile main unit according to claim 1, wherein: The front panel and the rear panel are both provided with ventilation and dust-proof structures.

8. The structure of a backward-inclined centrifugal fan applied to the main unit of a split-type DC charging pile according to claim 1 or 7, characterized in that: The ventilation and dust-proof structure includes movable self-hanging louvers, fixed-angle louvers, and stainless steel wire meshes arranged from inside to outside.

9. The structure of a backward-inclined centrifugal fan applied to a split-type DC charging pile host according to claim 1, wherein: The guide telescopic rod mechanism includes a guide rod and a locking connection seat. The guide rod is pivotally connected to the inner wall of the corresponding side panel of the top cover. The bottom of the locking connection seat is pivotally connected to the upwardly protruding connection seat of the top plate. The guide rod is inserted into the track groove of the locking connection seat. A guide locking groove is also provided on the locking connection seat. The locking protrusion of the guide rod is installed in the guide locking groove. The guide locking groove includes a linear guide groove and a plurality of branch locking grooves.

10. The structure of a backward-inclined centrifugal fan applied to the main unit of a split-type DC charging pile according to claim 9, characterized in that: When the top cover is opened upward, the guiding telescopic rod mechanism composed of the guiding rod and the locking connection seat is pulled and elongated; when the top cover pauses, the locking protrusion of the guiding rod is fitted into the non-branching locking groove at the corresponding position, and is in a limit self-locking state. When the hand is released, the top cover will not fall back. When the guiding telescopic rod mechanism composed of the guiding rod and the locking connection seat is stretched to the longest state, at this time the top cover rotates upward to the maximum angle.

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