Hybrid heat dissipation type power transformer

Abstract

The invention discloses a hybrid heat dissipation type power transformer, and relates to the technical field of power transformers. The dry-type transformer comprises a mounting box, a dry-type transformer body and a mixed heat dissipation system. A cooling fan and an air outlet barrel are arranged at the rear end of the mounting box, a fan rotating shaft is connected with a self-cleaning filter barrel cover, vibration dust removal of the filter barrel cover is achieved through cooperation of a spring, a brush plate and a knocking spherical surface, and dust enters a detachable collecting box through a collecting opening. Profiling cooling fins are arranged in the mounting box and tightly attached to the transformer body, liquid cooling heat dissipation is carried out on the outer portion of the mounting box through a C-shaped cooling fin assembly, and cooling liquid is circularly cooled through the cooling box. The box door is provided with a dustproof air inlet and a rain shielding structure. By combining the air cooling and liquid cooling dual heat dissipation modes, the rotating shaft drives the brush plate to be matched with the filter cartridge cover supported by the spring, dust on the filter screen is automatically cleaned, blockage is avoided, continuous and efficient work of the heat dissipation fan is guaranteed, the internal temperature of the transformer is effectively reduced, equipment damage caused by heat accumulation is avoided, and the service life is remarkably prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of power transformers, and particularly relates to a hybrid-cooling power transformer. Background Art

[0002] A power transformer is a static electrical device used to convert an alternating voltage (current) of a certain value into another or several different values of voltage (current) with the same frequency. It realizes the transfer of electrical energy based on the principle of electromagnetic induction.

[0003] A dry-type power transformer is a transformer that does not use a liquid cooling medium and mainly relies on air or other gases for cooling. Due to its environmental protection, safety, and simple maintenance, it is widely used in fields such as construction, industry, and transportation. Its main features include an oil-free design without using insulating oil, avoiding oil leakage and fire risks; environmental protection: no oil, reducing environmental pollution; simple maintenance: simple structure and low maintenance cost; flexible installation: small size and light weight, suitable for various installation environments; good fire resistance: using flame-retardant materials with excellent fire resistance.

[0004] With the growth of power demand and the development of power systems, power transformers will gradually need to handle larger power and currents, which will inevitably lead to increased heat generation. To ensure the safe and stable operation of power transformers, a heat dissipation mechanism needs to be equipped for power transformers.

[0005] Heat dissipation fins are provided at the outer end of the power transformer to dissipate heat from the power transformer. When the power transformer is used at high temperatures, the heat dissipation efficiency of the heat dissipation fins for the internal heat of the power transformer is slow, and heat is easily accumulated inside the power transformer. The parts inside the power transformer are easily deformed or damaged by high-temperature baking, reducing the service life of the power transformer. Therefore, we propose a hybrid-cooling power transformer. Summary of the Invention

[0006] The purpose of the present invention is to provide a hybrid-cooling power transformer to solve the problem that when the existing power transformer is used at high temperatures, the heat dissipation efficiency of the heat dissipation fins for the internal heat of the power transformer is slow, heat is easily accumulated inside the power transformer, and the parts inside the power transformer are easily deformed or damaged by high-temperature baking, reducing the service life of the power transformer.

[0007] To solve the above technical problems, the present invention is realized through the following technical solutions:

[0008] The present invention relates to a hybrid heat dissipation type power transformer, which comprises an installation box. A box door is arranged on the front end face of the installation box. A heat dissipation fan is installed in the middle of the rear end face of the installation box. An air outlet cylinder is fixed around the heat dissipation fan. An arc-shaped groove is formed on one end face of the air outlet cylinder. A plurality of springs are fixed in the arc-shaped groove. A filter cylinder cover is fixed at the free end of the spring. The rotating shaft of the heat dissipation fan penetrates through the filter cylinder cover and is rotationally matched with it. A brush plate is fixed on the circumferential side surface of the rotating shaft. The bristles of the brush plate abut against the filter cylinder cover. A knocking spherical surface is arranged on the inner surface of the filter cylinder cover. A collection opening is formed on the lower arc surface of the air outlet cylinder. A track plate is arranged on the surface of the installation box below the air outlet cylinder. A groove is formed in the middle of the lower surface of the track plate. An extrusion spring is arranged in the groove. A limiting column is arranged at one end of the extrusion spring. The free end of the limiting column is a hemispherical surface. A collection box is installed on the track plate. The collection port of the collection box is adapted to the collection opening;

[0009] A heat dissipation component is arranged on the rear side surface in the installation box. The heat dissipation component comprises two fixing plates and a plurality of profiled heat dissipation fins fixed on the two fixing plates. The two fixing plates are respectively fixed on the upper side and the lower side of the rear wall of the installation box. The middle of the bottom surface in the installation box is fixed with a dry-type transformer body through bolts. A plurality of profiled heat dissipation fins are closely attached to the dry-type transformer body;

[0010] The installation box is fixed on the upper, lower, left and right four surfaces through a heat dissipation fin assembly. The heat dissipation fin assembly is composed of a liquid inlet pipe, a liquid outlet pipe and a plurality of C-shaped heat dissipation fins. A through hole is formed in the middle of the C-shaped heat dissipation fins. The two ends of a plurality of C-shaped heat dissipation fins are respectively fixedly communicated with the liquid inlet pipe and the liquid outlet pipe;

[0011] Support plates are fixed on the C-shaped heat dissipation fins on both sides of the lower surface of the installation box. A receiving plate is jointly fixed between the two support plates. A cooling box is arranged on the upper surface of the receiving plate. Flow guiding plates are alternately fixed on the inner wall of the cooling box. The liquid inlet pipe is communicated with the lower end of the side surface of the cooling box through a water outlet cooling pipe. The liquid outlet pipe is communicated with the upper end of the side surface of the cooling box through a water inlet cooling pipe. A pump is arranged on the circumferential side surface of the water outlet cooling pipe.

[0012] In one embodiment, an arc-shaped protrusion matching the arc-shaped groove is arranged on one surface of the filter cylinder cover. One surface of the arc-shaped protrusion is fixedly connected with the spring. The shape and size of the arc-shaped protrusion are both adapted to the arc-shaped groove. The arc-shaped protrusion and the arc-shaped groove are matched with each other.

[0013] In one embodiment, a handle is arranged on one surface of the collection box. A chute is arranged at the lower end of one side surface of the collection box. The chute is adapted to the track plate. A limiting hole matching the limiting column is formed in the middle of the chute. The limiting column and the limiting hole are clamped and matched.

[0014] In one embodiment, the liquid inlet pipe, the liquid outlet pipe and several C-shaped heat dissipation fins are all fixedly connected to the outer surface of the installation box.

[0015] In one embodiment, a cooling device is arranged in the cooling box. The cooling device is arranged on the flow guide plate at the middle position. An inlet pipe orifice is arranged on one side surface of the cooling box, and a valve is arranged on the peripheral side surface of the inlet pipe orifice.

[0016] In one embodiment, the position and size of the knocking spherical surface are both adapted to the brush plate, and the knocking spherical surface cooperates with the brush plate.

[0017] In one embodiment, an air inlet is opened at the lower end of one surface of the box door. Rain shields are arranged above the air inlets. A dust-proof net is fixed in the air inlets by screws, and a door lock structure is arranged on the box door.

[0018] The present invention has the following beneficial effects:

[0019] Efficient hybrid heat dissipation: Combining air cooling (heat dissipation fan, profiled heat dissipation fins) and liquid cooling (C-shaped heat dissipation fins, coolant circulation) dual heat dissipation mechanisms, significantly improving the heat dissipation efficiency and ensuring the stable operation of the transformer under high-temperature conditions.

[0020] Self-cleaning filtration system: The cooperation between the brush plate driven by the rotating shaft and the filter cartridge cover supported by the spring realizes the automatic cleaning of the dust on the filter net, avoiding blockage and ensuring the continuous and efficient operation of the heat dissipation fan.

[0021] Modular design: The collection box can be quickly disassembled and assembled through the sliding groove and the limit post, facilitating the cleaning of accumulated dust; the flow guide plate of the cooling box optimizes the coolant flow path, improving the heat exchange efficiency.

[0022] Dust-proof and rain-proof structure: The air inlets are equipped with dust-proof nets and rain shields to prevent external impurities and rainwater from invading, reducing the short-circuit risk and enhancing the environmental adaptability.

[0023] Prolonging the equipment life: Efficient heat dissipation reduces the internal thermal stress of the transformer, avoiding the deformation or aging of components, and significantly improving the reliability and service life of the equipment.

[0024] Of course, it is not necessary for any product implementing the present invention to achieve all the above advantages simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for describing the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention, and those of ordinary skill in the art can also obtain other drawings based on these drawings without creative efforts.

[0026] Figure 1 It is a schematic diagram of the overall structure of a hybrid cooling power transformer;

[0027] Figure 2 It is a left view of a hybrid cooling power transformer;

[0028] Figure 3 It is Figure 2 The sectional view taken along line A-A in

[0029] Figure 4 It is Figure 3 The enlarged view of part C in

[0030] Figure 5 It is Figure 3 The sectional view taken along line B-B in

[0031] Figure 6 It is Figure 5 The enlarged view of part A in

[0032] Figure 7 It is Figure 5 The enlarged view of part B in

[0033] Figure 8 It is Figure 3 The sectional view taken along line C-C in

[0034] In the attached drawings, the list of components represented by each reference numeral is as follows:

[0035] 1. Installation box; 101. Box door; 102. Cooling fan; 103. Air outlet pipe; 104. Arc groove; 105. Spring; 106. Filter cartridge cover; 1061. Arc protrusion; 107. Rotating shaft; 108. Brush plate; 109. Knocking spherical surface; 110. Collection opening; 111. Track plate; 112. Groove; 113. Extrusion spring; 114. Limit post; 115. Collection box; 116. Handle; 117. Slide groove; 118. Limit hole; 119. Air inlet; 120. Rain shield; 201. Cooling component; 202. Fixed plate; 203. Profiled cooling fins; 204. Dry-type transformer body; 205. Cooling fin assembly; 206. Liquid inlet pipe; 207. Liquid outlet pipe; 208. C-shaped cooling fin; 209. Through hole; 210. Support plate; 211. Bearing plate; 212. Cooling box; 213. Deflector; 214. Outlet water cooling pipe; 215. Inlet water cooling pipe; 216. Liquid inlet port; 217. Valve; 218. Pump. Detailed implementation manners

[0036] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0037] In the description of the present invention, it should be understood that the terms "upper", "middle", "outer", "inner", etc. indicating orientations or positional relationships are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements 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.

[0038] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" 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 according to specific circumstances.

[0039] Please refer to Figures 1-8 As shown in the figure, the present invention is a hybrid heat dissipation type power transformer, including an installation box 1. A box door 101 is arranged on the front end face of the installation box 1. A heat dissipation fan 102 is installed in the middle of the rear end face of the installation box 1. An air outlet cylinder 103 is fixed around the heat dissipation fan 102. An arc-shaped groove 104 is opened on one end face of the air outlet cylinder 103. A plurality of springs 105 are fixed in the arc-shaped groove 104. A filter cylinder cover 106 is fixed at the free end of the spring 105. The rotating shaft 107 of the heat dissipation fan 102 passes through the filter cylinder cover 106 and is rotationally matched with it. A brush plate 108 is fixed on the circumferential side of the rotating shaft 107. The bristles of the brush plate 108 abut against the filter cylinder cover 106, which is convenient for cleaning the mesh holes of the filter cylinder cover 106 and avoiding the influence on the heat dissipation effect due to long-term blockage. A knocking spherical surface 109 is arranged on the inner surface of the filter cylinder cover 106. A collection opening 110 is opened on the lower arc surface of the air outlet cylinder 103. A track plate 111 is arranged on the surface of the installation box 1 below the air outlet cylinder 103. A groove 112 is opened in the middle of the lower surface of the track plate 111. A pressing spring 113 is arranged in the groove 112. A limiting column 114 is arranged at one end of the pressing spring 113. The free end of the limiting column 114 is a hemispherical surface. A collection box 115 is installed on the track plate 111. The collection port of the collection box 115 is adapted to the collection opening 110. The cooperation between the brush plate 108 driven by the rotating shaft 107 and the filter cylinder cover 106 supported by the spring 105 realizes the automatic cleaning of the dust on the filter net, avoids blockage, and ensures the continuous and efficient operation of the heat dissipation fan 102.

[0040] A heat dissipation component 201 is provided on the rear inner side of the installation box 1. The heat dissipation component 201 includes two fixing plates 202 and a number of profiled heat dissipation fins 203 fixed on the two fixing plates 202. The two fixing plates 202 are respectively fixed on the upper side and the lower side of the rear wall of the installation box 1. A dry-type transformer body 204 is fixed to the middle of the inner bottom surface of the installation box 1 by bolts, and a number of profiled heat dissipation fins 203 are closely attached to the dry-type transformer body 204;

[0041] The installation box 1 is fixed to the upper, lower, left and right four surfaces of the installation box 1 through a heat dissipation fin assembly 205. The heat dissipation fin assembly 205 is composed of a liquid inlet pipe 206, a liquid outlet pipe 207 and a number of C-shaped heat dissipation fins 208. A through hole 209 is provided in the middle of the C-shaped heat dissipation fin 208. The two ends of a number of C-shaped heat dissipation fins 208 are respectively fixedly communicated with the liquid inlet pipe 206 and the liquid outlet pipe 207;

[0042] Support plates 210 are fixed on the C-shaped heat dissipation fins 208 on both sides of the lower surface of the installation box 1. A receiving plate 211 is jointly fixed between the two support plates 210. A cooling box 212 is provided on the upper surface of the receiving plate 211. Flow guide plates 213 are alternately fixed on the inner wall of the cooling box 212. The liquid inlet pipe 206 is communicated with the lower end of the side surface of the cooling box 212 through a water outlet cooling pipe 214, and the liquid outlet pipe 207 is communicated with the upper end of the side surface of the cooling box 212 through a water inlet cooling pipe 215. A pump 218 is provided on the circumferential side surface of the water outlet cooling pipe 214.

[0043] Further, an arc-shaped protrusion 1061 matching the arc-shaped groove 104 is provided on one surface of the filter cartridge cover 106. One surface of the arc-shaped protrusion 1061 is fixedly connected to the spring 105. The shape and size of the arc-shaped protrusion 1061 are both adapted to the arc-shaped groove 104, and the arc-shaped protrusion 1061 and the arc-shaped groove 104 cooperate with each other.

[0044] Further, a handle 116 is provided on one surface of the collection box 115. A chute 117 is opened at the lower end of one side surface of the collection box 115. The chute 117 is adapted to the track plate 111. A limiting hole 118 matching the limiting column 114 is opened in the middle of the chute 117. The limiting column 114 and the limiting hole 118 are clamped and matched. The collection box 115 is quickly disassembled and assembled through the chute 117 and the limiting column 114, which is convenient for cleaning dust accumulation; the flow guide plate 213 of the cooling box 212 optimizes the coolant flow path and improves the heat exchange efficiency.

[0045] Further, the liquid inlet pipe 206, the liquid outlet pipe 207 and a number of C-shaped heat dissipation fins 208 are all fixedly connected to the outer surface of the installation box 1.

[0046] Furthermore, a cooling device is provided in the cooling box 212, and the cooling device is arranged on the guide plate 213 at the middle position. A liquid inlet pipe 216 is provided on one side of the cooling box 212, and a valve 217 is provided on the side around the liquid inlet pipe 216 to facilitate the addition of coolant.

[0047] Furthermore, the position and size of the knocking spherical surface 109 are adapted to the brush plate 108, and the knocking spherical surface 109 and the brush plate 108 cooperate with each other, so that the filter cover 106 vibrates intermittently under the action of the spring 105 by hitting the knocking spherical surface 109 through the brush plate 109, thereby shaking off the dust on the outside of the filter cartridge cover 106.

[0048] Furthermore, an air inlet 119 is provided at the lower end of a surface of the box door 101, and a rain shield 120 is provided at the upper end of the air inlet 119 to prevent rainwater from splashing into the installation box 1 in rainy weather and causing short circuit or damage to the equipment; a dustproof net is fixed in the air inlet 119 by screws to prevent external impurities and rainwater from intruding, reduce the risk of short circuit, and enhance environmental adaptability; a door lock structure is provided on the box door 101, which is convenient for locking the box door 101 to prevent strangers from accidentally opening it and causing safety hazards.

[0049] See also Figures 1-8 As shown, this embodiment is a working principle of a hybrid heat dissipation power transformer: when the dry-type transformer body 204 is in use, the heat dissipation fan 102 is started synchronously. When the heat dissipation fan 102 rotates, the rotating shaft 107 drives the brush plate 108 to clean the filter cartridge cover 106 to prevent dust from clogging the filter holes of the filter cartridge cover 106 during long-term use, thereby affecting the heat dissipation effect; at the same time, the pump 208 can also be turned on synchronously, and it can also be determined whether to turn it on based on the temperature value of the temperature sensor installed in the installation box 1. In the present invention, it is defaulted to be turned on synchronously. After the pump 218 is turned on, the coolant in the cooling box 212 is cooled by the water outlet. The cooling pipe 214 transports the coolant to the liquid inlet pipe 206, and then transports it to the liquid outlet pipe 207 through the through hole 209 in the C-type heat sink fin 208, and finally returns to the cooling box 212 through the water inlet cooling pipe 215. The coolant transported back takes away a large amount of heat on the C-type heat sink fin 208, thereby accelerating its heat dissipation speed. At the same time, the coolant transported back is cooled by the cooling device in the cooling box 212 and then enters the through hole 209 to dissipate the heat of the C-type heat sink fin 208, thereby quickly taking away the heat generated by the operation of the transformer body 204, avoiding deformation or aging of components, and significantly improving the reliability and service life of the equipment.

[0050] In the description of this specification, the descriptions referring to terms such as "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

[0051] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and utilize the present invention well. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A hybrid heat dissipation power transformer, comprising a mounting box (1), characterized in that: The front end surface of the installation box (1) is provided with a box door (101), and a heat dissipation fan (102) is installed in the middle of the rear end surface of the installation box (1). An air outlet tube (103) is fixed around the heat dissipation fan (102), and an arc-shaped groove (104) is opened on one end surface of the air outlet tube (103). A plurality of springs (105) are fixed in the arc-shaped groove (104), and a filter cartridge cover (106) is fixed to the free end of the spring (105). The rotating shaft (107) of the heat dissipation fan (102) passes through the filter cartridge cover (106) and is rotatably matched therewith. A brush plate (108) is fixed to the peripheral side surface of the rotating shaft (107), and the bristles of the brush plate (108) are in contact with the filter cartridge cover (106). The inner surface of the filter cartridge cover (106) is provided with a striking spherical surface (109), the lower arc surface of the air outlet cylinder (103) is provided with a collecting opening (110), the surface of the installation box (1) located below the air outlet cylinder (103) is provided with a track plate (111), a groove (112) is provided in the middle of the lower surface of the track plate (111), a compression spring (113) is provided in the groove (112), a limiting column (114) is provided at one end of the compression spring (113), the free end of the limiting column (114) is a hemispherical surface, a collecting box (115) is installed on the track plate (111), and the collecting port of the collecting box (115) is adapted to the collecting opening (110); A heat dissipation component (201) is arranged on the inner rear side of the installation box (1), and the heat dissipation component (201) comprises two fixing plates (202) and a plurality of contoured heat dissipation fins (203) fixed on the two fixing plates (202), the two fixing plates (202) being respectively fixed on the upper side and the lower side of the rear wall of the installation box (1), a dry-type transformer body (204) being fixed on the middle part of the inner bottom surface of the installation box (1) by means of bolts, and the plurality of contoured heat dissipation fins (203) being closely attached to the dry-type transformer body (204); The installation box (1) is fixed to the upper, lower, left and right surfaces of the installation box (1) through a heat dissipation fin assembly (205); the heat dissipation fin assembly (205) is composed of a liquid inlet pipe (206), a liquid outlet pipe (207) and a plurality of C-shaped heat dissipation fins (208); a through hole (209) is provided in the middle of the C-shaped heat dissipation fin (208); and the two ends of the plurality of C-shaped heat dissipation fins (208) are respectively fixedly connected to the liquid inlet pipe (206) and the liquid outlet pipe (207); Support plates (210) are fixed on the C-shaped heat dissipation fins (208) on both sides of the lower surface of the installation box (1), a receiving plate (211) is fixed between the two support plates (210), a cooling box (212) is arranged on the upper surface of the receiving plate (211), guide plates (213) are alternately fixed on the inner wall of the cooling box (212), the liquid inlet pipe (206) is connected to the lower end of the side of the cooling box (212) through a water outlet cooling pipe (214), the liquid outlet pipe (207) is connected to the upper end of the side of the cooling box (212) through a water inlet cooling pipe (215), and a pump (218) is arranged on the side surface of the water outlet cooling pipe (214).

2. A hybrid heat dissipation power transformer according to claim 1, characterized in that: A surface of the filter cartridge cover (106) is provided with an arc-shaped protrusion (1061) matching the arc-shaped groove (104); a surface of the arc-shaped protrusion (1061) is fixedly connected to the spring (105); the shape and size of the arc-shaped protrusion (1061) are adapted to the arc-shaped groove (104); the arc-shaped protrusion (1061) and the arc-shaped groove (104) cooperate with each other.

3. A hybrid heat dissipation power transformer according to claim 1, characterized in that: A handle (116) is provided on one surface of the collection box (115); a slide groove (117) is provided at the lower end of one side surface of the collection box (115); the slide groove (117) is adapted to the track plate (111); a limiting hole (118) matching the limiting column (114) is provided in the middle of the slide groove (117); the limiting column (114) and the limiting hole (118) are snap-fitted.

4. A hybrid heat dissipation power transformer according to claim 1, characterized in that: The liquid inlet pipe (206), the liquid outlet pipe (207) and the plurality of C-shaped heat dissipation fins (208) are all fixedly connected to the outer surface of the installation box (1).

5. A hybrid heat dissipation power transformer according to claim 1, characterized in that: A cooling device is arranged in the cooling box (212), and the cooling device is arranged on a guide plate (213) at a middle position. A liquid inlet (216) is arranged on one side of the cooling box (212), and a valve (217) is arranged on the side surrounding the liquid inlet (216).

6. A hybrid heat dissipation power transformer according to claim 1, characterized in that: The position and size of the knocking spherical surface (109) are adapted to the brush plate (108), and the knocking spherical surface (109) and the brush plate (108) cooperate with each other.

7. A hybrid heat dissipation power transformer according to claim 1, characterized in that: An air inlet (119) is provided at the lower end of a surface of the box door (101), a rain shield (120) is provided at the upper end of the air inlet (119), a dustproof net is fixed in the air inlet (119) by screws, and a door lock structure is provided on the box door (101).

8. A hybrid heat dissipation power transformer according to claim 1, characterized in that: The pump (218) is electrically connected to the controller and an external power supply, and the cooling fan (102) is electrically connected to the controller and an external power supply.

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