Air cooling system of high-voltage frequency converter

Abstract

The invention relates to an air cooling system of a high-voltage frequency converter. A high-voltage inverter (1) is provided with: a cabinet (11) in which electrical equipment is housed; and a door plate (12) capable of opening and closing the cabinet and having a plurality of air inlet holes through which cooling air enters the cabinet. The air cooling system is provided with: a fan (2) which is provided at the top of the cabinet, has an air inlet communicating with the cabinet, and has an air outlet formed in the side surface of a fan frame that accommodates the fan; and an air guide structure (3) provided at the top of the cabinet so as to be connected to the air outlet of the fan, the air guide structure (3) having an air duct base part (31) that forms an air duct having one end communicating with the air outlet of the fan and the other end opening upward so as to serve as an open side communicating with outside air, the air guide structure exhausts hot air flowing through the inside of the cabinet to the upper part through the air duct. The air cooling system is provided with the air guide structure, so that the temperature around the fan can be prevented from being too high, noise is reduced, and water dripping is prevented while air short circuit is avoided.

Description

Technical Field

[0001] The invention relates to an air cooling system for a high-voltage frequency converter, and in particular to an air cooling system for a high-voltage frequency converter with an air guide structure. Background Art

[0002] The high-voltage inverter contains a large number of electrical equipment in the cabinet. As a high-power frequency modulation power supply device, the power conversion unit and the electrical equipment of the transformer in the cabinet will generate a lot of heat during operation. Therefore, a stable heat dissipation system is required to dissipate the internal heat to prevent damage to the internal electrical equipment. The air cooling system has the advantages of low failure rate and easy maintenance, so it is widely used in the heat dissipation of power control devices.

[0003] A fan of an air cooling system is usually installed on the top of the cabinet of the power control device. Through the action of the fan, cooling air is sucked into the cabinet from the air inlet holes of the cabinet door panel. The sucked cooling air undergoes heat exchange with the air in the cabinet and becomes hot air, which is discharged to the outside of the cabinet through the fan, thereby achieving heat dissipation in the cabinet of the high-voltage inverter.

[0004] In the previous air cooling system of high voltage inverter, Fig.11 As shown in FIG. 1 , when the fan outlet faces the side, the hot air is discharged horizontally toward the front through the outlet. Therefore, most of the heat is only discharged around the fan, which may cause the fan life to be shortened due to the high temperature around the fan.

[0005] In addition, the fan rotation will produce a lot of noise, such as Fig.11 As shown in the figure, since the fan outlet faces the side, affected by the hot air exhaust direction and airflow, it is easy to cause excessive noise in the outlet direction of the high-voltage inverter, which will directly affect the noise test accuracy of the noise test point. Therefore, there is a problem of increased noise level caused by the exhaust direction.

[0006] In addition, especially in Fig.11 As shown in the figure, when the fan outlet and the cabinet door face the same direction, that is, the outlet is formed in the front, there is a problem of "wind short circuit" between the fan outlet direction and the air inlet direction of the door panel, resulting in reduced heat dissipation performance. The so-called "wind short circuit" means that the fan outlet direction and the door panel air inlet direction are in the same direction, and the hot air discharged from the fan is sucked into the work cabinet through the door panel air inlet hole.

[0007] In addition, in the previous air cooling system of high-voltage inverters, such as Fig.11 As shown, the air outlet of the fan is directly exposed to the ambient air, and dripping water falling to the top of the cabinet can easily invade through the air outlet of the fan, so there is a problem that it is impossible to prevent dripping water. Summary of the invention

[0008] The present invention is made in view of the above problems, and its purpose is to provide an air cooling system for a high-voltage inverter that can prevent water dripping while avoiding excessive temperature around the fan, reducing noise, and avoiding wind short circuit.

[0009] In order to solve the above-mentioned problem, the present invention relates to an air cooling system for a high-voltage inverter, the high-voltage inverter comprising: a cabinet for accommodating electrical equipment; and a door panel for opening and closing the cabinet, forming a plurality of air inlets for cooling air to enter the interior of the cabinet; the air cooling system comprising: a fan, arranged on the cabinet top of the cabinet, comprising a fan body and a fan frame for accommodating the fan body, an air inlet for communicating with the interior of the cabinet formed on the bottom surface of the fan frame, and an air outlet formed on the side surface of the fan frame; and an air guide structure, arranged on the cabinet top of the cabinet in connection with the air outlet of the fan, comprising an air duct base portion, the air duct base portion (31) forming an air duct having one end connected with the air outlet of the fan and the other end open upwardly and connected to the outside air as the open side, the air guide structure discharges the air that becomes hot air due to flowing through the interior of the cabinet upwardly through the air duct.

[0010] The air cooling system of the high-voltage frequency converter according to the present invention may also be such that the air outlet is formed on a side surface of the fan frame facing the same direction as the door panel.

[0011] The air cooling system of the high-voltage inverter related to the present invention may also be that the air duct base portion includes: a straight pipe portion, located at one end side of the air duct and formed in a cubic shape; and an arc-shaped pipe portion, formed continuously with the straight pipe portion at the other end side of the air duct, and a continuous surface continuous with the bottom surface of the straight pipe portion is a curved surface curved upward.

[0012] The air cooling system of the high-voltage inverter according to the present invention may also be that the air guiding structure comprises: an air duct opening and closing component, which is arranged in the straight duct portion and has a plurality of plate-like parts that open and close the air duct in accordance with the wind pressure in the air duct.

[0013] The air cooling system for a high-voltage inverter according to the present invention may be such that the plurality of plate-like portions are arranged in an up-down direction in the air duct opening and closing component, and the opening and closing action is performed by rotating in accordance with the wind pressure.

[0014] The air cooling system of the high-voltage inverter according to the present invention may also be that when the fan is not working, the multiple plate-like parts hang down due to their own weight in a manner such that two adjacent plate-like parts partially overlap each other, thereby closing the air duct; when the fan is working, the multiple plate-like parts rotate at a specified angle, thereby opening the air duct.

[0015] The air cooling system for a high-voltage frequency converter according to the present invention may also be such that, in the straight pipe portion, two air duct opening and closing components are provided at a predetermined interval.

[0016] The air cooling system of the high-voltage inverter according to the present invention may also be such that the air guiding structure is provided with a water-stop rib between the two air duct opening and closing components, and the water-stop rib prevents dripping water entering through the air duct opening and closing components on the open side of the air duct from moving further.

[0017] The air cooling system of the high-voltage frequency converter according to the present invention may also be such that a drainage groove capable of draining dripping water is formed at the bottom of the straight pipe portion.

[0018] The air cooling system of the high-voltage frequency converter according to the present invention may also be such that sound-absorbing cotton is laid on at least one of the bottom surface of the straight pipe part and the curved surface of the arc-shaped pipe part.

[0019] The air cooling system of the high-voltage inverter of the present invention may also be that a drainage groove capable of draining dripping water is formed at the bottom of the straight pipe part, sound-absorbing cotton is laid on the bottom surface of the straight pipe part, and the part of the sound-absorbing cotton overlapping with the drainage groove is cut off.

[0020] The air cooling system of the high-voltage frequency converter according to the present invention may also be such that the air guide structure is provided with a protective net on the end surface of the open side of the air duct.

[0021] The air cooling system of the high-voltage frequency converter according to the present invention may also be such that the air guiding structure is arranged on the top of the cabinet via a base.

[0022] According to the air cooling system of the high-voltage inverter, it is possible to prevent dripping while avoiding excessive temperature around the fan, reducing noise, and avoiding wind short circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a perspective view showing the overall structure of a high-voltage inverter according to one embodiment of the present invention.

[0024] Figure 2 The diagram is a schematic diagram showing the flow of air when a fan in the air cooling system of the high-voltage inverter according to the embodiment of the present invention is in operation.

[0025] Figure 3 It is a perspective view showing an air guide structure in an air cooling system of a high-voltage inverter according to an embodiment of the present invention.

[0026] Figure 4 This is a perspective view showing the air guide structure in the air cooling system of the high-voltage inverter according to the embodiment of the present invention, when viewed from another angle.

[0027] Figure 5 This is a perspective view showing an air guide structure in an air cooling system for a high-voltage inverter according to an embodiment of the present invention, when viewed from a side connected to an air outlet of a fan.

[0028] Figure 6 This is a diagram showing an air duct opening and closing member included in an air guide structure in an air cooling system of a high-voltage inverter according to an embodiment of the present invention.

[0029] Figure 7 It is a schematic diagram showing the opening and closing of the plate-like portion of the air duct opening and closing component in the air cooling system of the high-voltage inverter involved in one embodiment of the present invention. The left side shows a view when the plate-like portion is closed when the fan is not working, and the right side shows a view when the plate-like portion is open when the fan is working.

[0030] Figure 8 A side view showing an example of a water stop rib provided in an air guide structure in an air cooling system of a high-voltage inverter according to an embodiment of the present invention.

[0031] Fig. 9 This is a diagram showing the flow of dripping water when the fan in the air cooling system of the high-voltage inverter according to the embodiment of the present invention is not in operation.

[0032] Fig.10 This is a diagram showing the flow of dripping water when a fan in the air cooling system of the high-voltage inverter according to the embodiment of the present invention is operating.

[0033] Fig.11 Schematic diagram of an air cooling system for a high voltage inverter in the prior art.

[0034] Description of symbols

[0035] 1...high voltage inverter (high voltage inverter), 11...cabinet, 12...door panel,

[0036] 2… fan,

[0037] 3…wind guide structure, 31…air duct base, 31A…straight duct part, 31B…arc duct part,

[0038] 30 ... mounting frame, 33A, 33B ... air duct opening and closing member, 331A, 331B ... plate-shaped portion, 332A, 332B ... rotating shaft, 333A, 333B ... opening limiting member,

[0039] 32…base, 34…water-stop rib, 35…sound-absorbing cotton, 36…protective net, 37…drainage trough. DETAILED DESCRIPTION

[0040] The following will be combined with the accompanying drawings to clearly and completely describe the embodiments of the present invention. Obviously, the described embodiments are only examples, and therefore limit the scope of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0041] <Implementation Method>

[0042] Figure 1 It is a perspective view showing the overall structure of a high-voltage inverter according to one embodiment of the present invention. Figure 2 This is a schematic diagram showing the flow of air in the air cooling system of the high-voltage inverter according to one embodiment of the present invention.

[0043] like Figure 1 As shown, the air cooling system of this embodiment is arranged on the top of the cabinet of the high-voltage inverter 1.

[0044] The high-voltage inverter 1 is a power control device, and various electrical devices such as semiconductor devices, conductors, fuses, capacitors, transformers, switches, circuit breakers, and measuring devices are stored in a cabinet.

[0045] In the present embodiment, the cabinet 11 of the high-voltage inverter 1 is formed as, for example, an integrated cabinet in which a power conversion unit and a transformer are housed side by side in the front and back directions in a cabinet body.

[0046] like Figure 1 As shown, the outer shape of the cabinet 11 is, for example, a box-shaped. A door panel 12 for opening and closing the cabinet is provided on the front side of the cabinet 11. A plurality of air inlets (not shown) for cooling air are formed on the door panel 12, and an air filter (not shown) is provided for each of the plurality of air inlets. The air filter is, for example, a mesh having a plurality of through holes, and can separate and capture foreign matter such as dust from the air flowing into the interior of the cabinet 11 from the air inlet 3 through the plurality of through holes, so as to ensure the cleanliness of the internal environment of the cabinet 11. In addition, at least one exhaust port (not shown) is formed on the top surface of the cabinet 11 for discharging the air (hot air) after heat exchange in the cabinet 11 from the cabinet 11.

[0047] In this embodiment, if Figure 1 As shown, the air cooling system includes a fan 2 and an air guide structure 3.

[0048] The fan 2 is, for example, a centrifugal fan, and includes a fan body and a fan frame for housing the fan body. An air inlet for communicating with the interior of the cabinet 11 is formed on the bottom surface of the fan frame, and the air inlet is arranged on the top of the cabinet 11 in a manner that the air inlet is opposite to the exhaust port of the cabinet 11. Thus, the fan 2 is connected to the interior of the cabinet 11 via the air inlet of the fan and the exhaust port of the cabinet. In addition, the fan 2 has an air outlet formed on the side of the fan frame. Figure 1 2 shows an example in which an air outlet is formed on the front side surface facing forward like the door panel 12. The fan 2 is configured to discharge hot air sucked from the exhaust port of the cabinet 11 through the air outlet.

[0049] Figure 2 FIG. 2 shows the air flow when the fan 2 is working. When the fan 2 is working, the air supplied by the fan 2 generates a negative pressure in the cabinet 11, thereby Figure 2 As shown, cooling air is sucked in from the outside through the air inlet hole of the door panel 12, the sucked cooling air flows through the cabinet 11 and exchanges heat with the air in the cabinet 11, becomes hot air after the heat exchange, is sucked in from the exhaust port of the cabinet 11 through the air inlet by the fan 2, and is finally discharged to the outside through the air guide structure 3.

[0050] like Figure 1 As shown, on the cabinet top 11, an air guide structure 3 is connected to the air outlet of the fan 2. Figures 3 to 6 The specific structure of the wind guide structure is shown.

[0051] like Figure 3 , Figure 4 As shown, the air guide structure 3 includes an air duct base portion 31 forming an air duct having one end communicating with the air outlet of the fan 2 and the other end opening upward to communicate with the outside air as an open side.

[0052] Moreover, the air duct base portion 31 includes: a straight duct portion 31A, which is located at one end side of the air duct and is formed in a cubic shape; and an arc duct portion 31B, which is continuously formed with the straight duct portion 31A at the other end side of the air duct, and the continuous surface continuous with the bottom surface of the straight duct portion 31A is a curved surface curved upward.

[0053] exist Figure 3 In the figure, a dotted line is shown at the boundary position between the straight pipe part 31A and the arc-shaped pipe part 31B. The dotted line is imaginary and is shown only for the sake of understanding. Such a boundary does not exist in the actual structure. Figure 3 In the figure, the right end corresponds to one end of the air duct, which is also the upstream direction of the wind flow in the air duct, the upper left end corresponds to the other end of the air duct, which is also the downstream direction of the wind flow in the air duct, the right side of the dotted line corresponds to the straight pipe part 31A, and the left side of the dotted line corresponds to the arc-shaped pipe part 31B.

[0054] Since one end of the air duct of the air-guiding structure 3 (the open end of the straight duct portion 31A) is connected to the air outlet of the fan 2, it receives the hot air (referred to as hot air for short) discharged from the air outlet of the fan 2, and then guides the hot air along the straight duct portion 31A and the arc-shaped duct portion 31B, and finally discharges it upward to the outside through the other end of the air duct (the open end of the arc-shaped duct portion 31B).

[0055] like Figure 3 , 4 As shown, the lower portion of the straight duct portion 31A in the air duct base portion 31 is connected to a base 32 , and the air guide structure 3 is fixed to the top of the cabinet 11 via the base 32 .

[0056] Hereinafter, main components of the air guide structure 3 will be described.

[0057] like Figure 3 and Figure 4 As shown, the air guide structure 3 mainly comprises: two air duct opening and closing components 33A, 33B, which are arranged opposite to each other at a prescribed interval in the wind flow direction, and open the air duct formed by the air duct base 31 when the fan 2 is working, and close the air duct formed by the air duct base 31 when the fan 2 is not working; a water stop rib 34, located between the two air duct opening and closing components 33A, 33B, to prevent dripping water entering through the air duct opening and closing component 33A located at the other end side of the air duct (outside the air duct) from moving further; and a mounting frame 30, for installing the two air duct opening and closing components 33A, 33B and the mounting frame 30, and installed in the straight duct portion 31A in a state where the two air duct opening and closing components 33A, 33B and the mounting frame 30 are installed.

[0058] like Figure 4 As shown, the mounting frame 30 is formed into a rectangular cylindrical shape corresponding to the straight pipe part 31A, for example, and at least the bottom outer surface and the side outer surface are in contact with the bottom inner surface and the side inner surface of the straight pipe part 31A, and the top outer surface may or may not be in contact with the inner surface of the straight pipe part 31A. Thus, when the mounting frame 30 is installed as a whole in the straight pipe part 31A with the two air duct opening and closing components 33A, 33B and the water stop rib 34 installed, the mounting frame 30 and the part of the straight pipe part 31A where dripping water easily passes can be in contact with each other.

[0059] Next, the specific structure of the air passage opening and closing members 33A and 33B will be described.

[0060] like Figure 6As shown, in each of the air duct opening and closing members 33A and 33B, a plurality of plate-like portions 331A and 331B are arranged in the up-down direction, which is the direction of gravity, and the plurality of plate-like portions 331A and 331B are parallel to the horizontal direction.

[0061] The following description will be given taking the air duct opening and closing member 33A as an example.

[0062] Figure 7 The diagram shows the opening and closing of the plate-shaped portion 331A of the air duct opening and closing component 33A. The left side shows the plate-shaped portion closed when the fan is not working, and the right side shows the plate-shaped portion opened when the fan is working.

[0063] like Figure 7 As shown, in the air duct opening and closing component 33A, each of the plurality of plate-like portions 331A is rotatably mounted on the mounting frame 30 via a rotating shaft 332A. The outer shape of the plate-like portion 331A corresponds to the shape of the mounting frame 30, for example, a long rectangular plate that is shorter in the vertical direction and longer between the two side edges of the mounting frame 30.

[0064] Specifically, for example, a plurality of rotation shafts 332A are installed in the vertical direction on each of the side surfaces of one side and the other side of the installation frame 30. The two ends of the length direction of a plate-like portion 331A are supported on one rotation shaft 332A formed on the side surface of one side and another rotation shaft 332A formed on the side surface of the other side and located at the same height as the one rotation shaft. Thus, a plurality of plate-like portions 331A arranged in the vertical direction as the gravity direction are axially supported between the side surface of one side and the other side of the installation frame 30, and the plate-like portions 331A rotate around the central axis of the rotation shaft 332A together with the rotation shaft 332A. The central axis of the rotation shaft 332A is, for example, parallel to the long side direction of the plate-like portion 331A.

[0065] The plurality of plate-like portions 331A can rotate and perform an opening and closing operation in accordance with the wind pressure in the air duct formed by the air duct base portion 31 , thereby opening and closing the air duct formed by the air duct base portion 31 .

[0066] like Figure 7 As shown on the left side of , when the fan 2 is not operating, the plurality of plate-like portions 331A hang down due to their own weight and are in a closed state, and any two plate-like portions 331A adjacent in the vertical direction partially overlap each other in the closed state.

[0067] like Figure 7As shown on the right side of the figure, when the fan 2 is working, due to the air supply of the fan 2, each plate-like portion 331A is subjected to the pressure (wind pressure) of the air flow F entering the air duct formed by the air duct base portion 31 from the air outlet of the fan 2 and one end of the air duct. When the wind pressure borne by each plate-like portion 331A reaches a predetermined value or more, an opening action is performed by rotating around the central axis C of the rotating shaft 332A, so that the air duct becomes an open state. Here, the wind pressure of a predetermined value or more is a force that rotates the plate-like portion 331A around the central axis C against the deadweight of the plate-like portion 331A and the friction of the rotating shaft 332A.

[0068] When the wind pressure received by each plate-like portion 331A is smaller than the above-mentioned predetermined magnitude, the plate-like portion 331A assumes a posture in which the air passage is closed by its own weight.

[0069] In addition, if Figure 7 As shown, an opening restriction member 333A is attached to each plate-shaped portion 331A. Each opening restriction member 333A is parallel to the rotation axis 332A of each plate-shaped portion 331A and fixed to the side surface of the mounting frame 30 at a position closer to the other end of the air duct than each plate-shaped portion 331A.

[0070] Each opening limiting member 333A limits the maximum rotation angle of each plate-like portion 331A, thereby limiting the degree of opening of the air duct. For example, when the inclination angle θ of each plate-like portion 331A relative to the lower side in the vertical direction is less than a predetermined angle, each opening limiting member 333A does not contact the plate-like portion 331A, and allows the plate-like portion 331A to rotate around the central axis C. When the inclination angle θ of the plate-like portion 331A reaches a predetermined angle, each opening limiting member 333A contacts the plate-like portion 331A, thereby limiting further rotation of the plate-like portion 331A and prohibiting an increase in the inclination angle θ.

[0071] The prescribed angle is the maximum rotation angle of the plate-like portion 331A. Each opening limiting member 333A allows the plate-like portion 331A to rotate at an angle θ smaller than the prescribed angle, and prohibits the plate-like portion 331A from rotating at an angle θ larger than the prescribed angle. If the prescribed angle is greater than 90°, the plate-like portion 331 will become substantially horizontal, and dripping water W will easily pass between adjacent plate-like portions. Therefore, in order to ensure drip-proof performance, the prescribed angle is at least less than 90°. When the prescribed angle is 60°, both hot air discharge and drip-proof performance can be taken into account, so it is preferred.

[0072] The above specifically describes the air duct opening and closing component 33A, but the air duct opening and closing component 33B is the same as the air duct opening and closing component 33A except for the configuration position, and has the same plate-like portion 331B, rotating shaft 332B and opening limiting component 333B as the plate-like portion 331A, rotating shaft 332A and opening limiting component 333A, and operates in the same way as the air duct opening and closing component 33A, so repeated descriptions are omitted.

[0073] Next, the specific structure of the water stop rib 34 will be described.

[0074] As described above, the water stop rib 34 is provided between the two air duct opening and closing members 33A and 33B, and prevents dripping water entering through the air duct opening and closing member 33A located at the other end side of the air duct (outside the air duct) from advancing further.

[0075] like Figure 3 as well as Figure 6 As shown, in the mounting frame 30, the water stop rib 34 is provided, for example, between the two air duct opening and closing components 33A and 33B, near the air duct opening and closing component 33A, which is closer to the other end side of the air duct (outside the air duct). When the water stop rib 34 is provided close to the air duct opening and closing component 33A, it is preferred because it can effectively block dripping water entering from the air duct opening and closing component 33A.

[0076] like Figure 8 As shown, the water stop rib 34 is formed in a frame shape open at the top along the bottom surface of the mounting frame 30 and at least the lower part of the two side surfaces of the mounting frame 30. Thus, the water stop rib 34 is formed along the lower edge of the air duct opening and closing component 33A and the lower part of the two side edges, and can block dripping water flowing along the lower edge of the air duct opening and closing component 33A and the lower part of the two side edges.

[0077] Next, other configurations of the air guide structure 3 will be described.

[0078] like Figure 3 and Figure 5 As shown, a drainage groove 37 connected to the air duct formed by the air duct base 31 is formed at the bottom of the straight duct portion 31A in the air duct base 31, and the drainage groove 37 is used to drain the dripping water. In addition, the drainage groove 37 can be provided with an interface connected to an external drainage pipe, and by connecting a drainage hose to the interface, the dripping water can be discharged to a desired location outside.

[0079] In addition, if Figure 3 As shown, in the air duct base 31, sound absorbing cotton 35 is laid on the bottom surface of the straight duct portion 31A, and the portion of the sound absorbing cotton 35 overlapping with the drainage groove 37 is cut away. In addition, sound absorbing cotton 35 can also be laid on the curved surface of the arc duct portion 31B.

[0080] In addition, if Figure 3 , 4 As shown in FIG. 6 , the wind guide structure 3 is provided with a protective net 36 at the other end of the air duct, that is, the end surface of the open side of the arc-shaped duct portion 31B. The open shape of the other end of the air duct is, for example, a quadrilateral, and the protective net 36 is also formed into a quadrilateral accordingly.

[0081] <Modification>

[0082] As mentioned above, the air cooling system of the high-voltage inverter according to one embodiment has been described, but the present invention is not limited to this embodiment, and various modifications are possible as described below.

[0083] In the above embodiment, the air duct opening and closing components are provided with two air duct opening and closing components 33A and 33B, but it is also possible to configure only the air duct opening and closing component 33A. Even if only the air duct opening and closing component 33A is provided, the cooperation between the air duct opening and closing component 33A and the drainage groove 37 can basically ensure the drip-proof effect.

[0084] In the above embodiment, the water-stop rib is formed into a frame shape with an upper opening. This is because, since dripping water has the characteristic of flowing downward along the direction of gravity, there is little dripping water staying on the upper part of the two side edges. In contrast, the lower edge of the air duct opening and closing component 33A and the lower part of the two side edges are the key parts for preventing dripping water. Therefore, as described above, the water-stop rib is provided at least for the key parts. However, it is also possible to form the water-stop rib into a closed frame shape in a manner along the outer peripheral edge of the air duct opening and closing component 33A as a whole. In this case, it is possible to prevent dripping water for the entire circumference of the air duct opening and closing component 33A.

[0085] Next, refer to Figure 7 , Fig. 9 , Fig.10 The operation of the air cooling system of the above-mentioned embodiment will be described.

[0086] 《When the high-voltage inverter does not work and the fan does not work》

[0087] When the high-voltage inverter is in non-operating state, fan 2 does not work. Figure 7 As shown on the left side of FIG. 1 , the plurality of plate-like portions 331A and 331B of the air duct opening and closing components 33A and 33B are in a closed state due to hanging down due to gravity, and the air duct is also in a closed state at this time.

[0088] At this time, if Fig. 9 As shown, when there is dripping water in the external environment, the dripping water enters the air duct formed by the air duct base 31 through the protective net 36. It can be imagined that the dripping water includes the falling dripping water that falls vertically to the bottom surface of the air duct, and the inclined dripping water that falls toward the air duct opening and closing parts with an inclination angle relative to the vertical direction.

[0089] In the case where the water dripping is a falling dripping, the water dripping falls on the bottom surface of the air duct and splashes. At this time, the multiple plate-like parts 331A of the air duct opening and closing component 33A are in a closed state. Therefore, even if the water dripping splashes onto the air duct opening and closing component 33A, the splashed water cannot pass through the air duct opening and closing component 33A in the closed state, but flows down along the air duct opening and closing component 33A in the direction of gravity, and is finally discharged to the outside of the cabinet through the drainage groove 37.

[0090] In this case, since the sound-absorbing cotton 35 is laid on the air duct base 31, the falling water drops will absorb part of the kinetic energy when falling on the sound-absorbing cotton 35, so that the speed of the splashing water drops is reduced, and some water drops will lose the kinetic energy to move forward and no longer splash toward the air duct opening and closing component 33A, but will be directly discharged to the outside of the cabinet along the bottom surface of the air duct through the drainage groove 37. In addition, since the air duct opening and closing component 33A is provided with a water-stopping rib 34, even if water drops penetrate along the lower edge of the air duct opening and closing component 33A and the lower part of the two side edges, the water-stopping rib 34 can prevent it from moving forward. Theoretically speaking, the dripping water after passing through the air duct opening and closing component 33A and the water-stop rib 34 basically loses its forward kinetic energy and cannot splash up. Even if it is assumed that the dripping water further splashes onto the air duct opening and closing component 33B, since the multiple plate-like parts 331B of the opening and closing component 33B are in a closed state, the splashing dripping water cannot pass through the air duct opening and closing component 33B in the closed state, but flows down along the air duct opening and closing component 33B in the direction of gravity, and is finally discharged to the outside of the cabinet through the drainage groove 37.

[0091] When the dripping water is inclined, the dripping water falls onto the multiple plate-like parts 331A of the air duct opening and closing component 33A in the closed state, is blocked by the multiple plate-like parts 331A, flows down along the air duct opening and closing component 33A in the direction of gravity, and is finally discharged to the outside of the cabinet through the drainage groove 37.

[0092] In this case, similarly to the above, since the water stop rib 34 and the air passage opening and closing member 33B are further provided, it is possible to prevent the dripping water from passing through the air passage opening and closing member 33A from further advancing.

[0093] 《When the high-voltage inverter is working and the fan is working》

[0094] When the high voltage inverter is in operation, the fan works 2, such as Figure 7 As shown on the right side of the figure, the multiple plate-like parts 331A and 331B of the air duct opening and closing parts 33A and 33B are opened due to the wind pressure of the fan, and the hot air F passes through the gap between the adjacent plate-like parts 331A and 331B and then passes through the protective net 36 to be discharged vertically upward. At this time, although the multiple plate-like parts 331A and 331B of the air duct opening and closing parts 33A and 33B are in an open state, their opening degree has not reached the horizontal level.

[0095] like Fig. 9 As shown, when there is dripping water in the external environment, the dripping water enters the air duct formed by the air duct base 31 through the protective net 36. It can be imagined that the dripping water includes the falling dripping water that falls vertically to the bottom surface of the air duct, and the inclined dripping water that falls toward the air duct opening and closing parts with an inclination angle relative to the vertical direction.

[0096] In the case where the dripping water is a falling dripping water, the dripping water splashes after falling on the bottom surface of the air duct. At this time, since the multiple plate-shaped parts 331A of the air duct opening and closing component 33A are opened at an opening that does not reach the horizontal level, a part of the dripping water splashing from the bottom surface collides with the multiple plate-shaped parts 331A, and most of it is blocked by the multiple plate-shaped parts 331A, flows down along the air duct opening and closing component 33A in the direction of gravity, and finally discharged to the outside of the cabinet through the drainage groove 37. A very small part of it is rebounded again by the plate-shaped parts 331A and passes between the adjacent plate-shaped parts 331A and continues to move toward the air duct opening and closing component 33B. In addition, another part of the dripping water splashing from the bottom surface also passes between the adjacent plate-shaped parts 331A and continues to move toward the air duct opening and closing component 33B. The dripping water passing through the adjacent plate-like parts 331A will lose the kinetic energy to move forward under the action of wind pressure, and will fall down before reaching the air duct opening and closing part 33B, or will be blocked when reaching the air duct opening and closing part 33B and will flow down along the multiple plate-like parts 331B in the direction of gravity, and finally be discharged to the outside of the cabinet through the drainage groove 37.

[0097] In the case of dripping at an angle, the dripping Figure 7 As shown on the right side of the cabinet, the water drops toward the plurality of plate-like parts 331A. At this time, since the plurality of plate-like parts 331A of the air duct opening and closing component 33A are opened at an opening that does not reach the horizontal level, a part of the falling water drops hits the plurality of plate-like parts 331A, and most of them are blocked by the plurality of plate-like parts 331A, flow down along the air duct opening and closing component 33A in the direction of gravity, and finally discharged to the outside of the cabinet through the drainage groove 37. A very small part of the water drops is rebounded again by the plate-like parts 331A, passes between the adjacent plate-like parts 331A, and continues to move toward the air duct opening and closing component 33B. In addition, another part of the falling water drops also passes between the adjacent plate-like parts 331A and continues to move toward the air duct opening and closing component 33B. The dripping water passing through the adjacent plate-like parts 331A will lose the kinetic energy to move forward under the action of wind pressure and fall down before reaching the air duct opening and closing part 33B, or be blocked after reaching the air duct opening and closing part 33B and flow down along the multiple plate-like parts 331B in the direction of gravity, and finally be discharged to the outside of the cabinet through the drainage groove 37.

[0098] In this case, the sound-absorbing cotton 35 and the water-stop rib 34 play the same role as when the high-voltage inverter is not working and the fan is not working. In addition, during the operation of the fan, the sound-absorbing cotton 35 can reduce the noise of the hot air discharge, and accordingly, the noise value of the fan noise test point is also reduced.

[0099] It can be seen from the above that dripping can be effectively prevented whether the fan is working or not, and noise can be effectively reduced when the fan is working.

[0100] Hereinafter, the effects of the air cooling system of the high-voltage inverter according to the present invention will be described.

[0101] According to the air cooling system of the high-voltage frequency converter involved in the present invention, an additional air guide structure is set for the fan, and the air duct base of the air guide structure forms an air duct with one end connected to the air outlet of the fan and the other end open to the top and connected to the outside air. In particular, by setting the other end of the air duct, that is, the final outlet of the hot air, to face upward, the hot air can be discharged upward instead of directly to the side as in the prior art, so that the problem of excessive temperature around the fan, excessive reduction and wind short circuit caused by the outlet wind direction can be effectively avoided. Moreover, since the additional air guide structure is set for the fan, the air outlet of the fan is not directly exposed to the ambient air. Therefore, if the dripping water falling to the top of the cabinet wants to invade the fan, it needs to pass through the air guide structure first, which increases the difficulty of dripping water invading the fan, and to a certain extent, the problem of anti-drip water is achieved. It can be seen that the air cooling system of the high-voltage frequency converter according to the present invention can solve all the problems existing in the prior art by additionally setting the air guide structure, and can achieve anti-drip water while avoiding excessive temperature around the fan, reducing noise and avoiding wind short circuit.

[0102] According to the air cooling system of the high-voltage inverter involved in the present invention, when the direction of the fan outlet is in the same direction as the door panel, the so-called "wind short circuit" is more likely to occur. Therefore, by having an air guide structure, the hot air is discharged upward, thereby effectively avoiding the situation where the hot air is discharged to the side and then directly enters the cabinet, and the occurrence of "wind short circuit" can be more effectively prevented.

[0103] According to the air cooling system of the high-voltage inverter involved in the present invention, by setting the part of the air duct connected to the air outlet of the fan as a straight pipe part, it can be easily connected according to the shape of the air outlet, and because the bottom surface of the straight pipe part is a plane, it is convenient to install some components on the bottom surface. In addition, by setting the part of the air duct that guides the hot air from the side to the top as an arc-shaped pipe part, the continuous surface connected to the bottom surface of the straight pipe part is a curved surface curved upward, the hot air can be discharged smoothly, and at the same time, compared with the case where the continuous surface is formed as a straight surface orthogonal to the bottom surface of the straight pipe part, heat concentration can be avoided.

[0104] According to the air cooling system of the high-voltage inverter involved in the present invention, the anti-drip effect can be further achieved by providing an air duct opening and closing component. In the case where two air duct opening and closing components are provided, the anti-drip effect can be better achieved through redundant settings.

[0105] According to the air cooling system of the above-mentioned high-voltage inverter, the air duct opening and closing component has a plurality of plate-like parts arranged in the direction of gravity, which open and close the air duct corresponding to the wind pressure of the fan air supply, thereby, there is no need to set up a component for opening and closing the air duct, and the opening and closing of the air duct can be easily controlled only by wind pressure, and the control of the opening and closing of the air duct can be realized with a simple structure. In addition, by configuring so that when the fan is not working, the plurality of plate-like parts are respectively drooped in the direction of gravity and two adjacent plate-like parts partially overlap each other, especially by configuring so that two adjacent plate-like parts partially overlap each other, the reliability of preventing dripping water from invading between the plate-like parts can be improved. In addition, by configuring so that when the fan is working, the maximum rotation angle of each of the plurality of plate-like parts is less than the angle in the horizontal direction and is not rotated to the horizontal, therefore, even when the fan is working and the plate-like parts are opened and dripping water falls, by limiting the maximum rotation angle of each of the plate-like parts, the plate-like parts can also block the dripping water.

[0106] According to the air cooling system of the high-voltage inverter involved in the present invention, by further comprising water-stopping ribs, even if dripping water passes through the edge of the air duct opening and closing component, it can be stopped by the water-stopping ribs, thereby more reliably preventing dripping water.

[0107] According to the air cooling system of the high-voltage inverter involved in the present invention, the air guide structure is constructed to be installed on the straight pipe part as a complete assembly after the air duct opening and closing components, the rotating shaft, and the water-stop ribs are installed on the mounting frame. Therefore, the air guide structure can be easily installed relative to the straight pipe part as a complete assembly.

[0108] According to the air cooling system of the high-voltage inverter involved in the present invention, by providing a drainage groove, dripping water falling on the bottom surface of the air duct can be discharged, thereby preventing dripping water from accumulating and overflowing the air duct opening and closing components and water-stopping ribs to invade the fan.

[0109] According to the air cooling system of the high-voltage inverter involved in the present invention, noise can be reduced by laying sound-absorbing cotton. Moreover, when water drops fall on the sound-absorbing cotton, the degree of splashing of water can be reduced compared to the case where water drops directly fall on the bottom surface of the air duct, thereby further improving the anti-drip effect.

[0110] According to the air cooling system of the high-voltage inverter of the present invention, the portion of the sound absorbing cotton overlapping the drainage groove is cut away, thereby making it possible to reliably expose the drainage groove and smoothly drain water through the drainage groove.

[0111] According to the air cooling system of the high-voltage inverter involved in the present invention, a protective net is set up. When dripping water falls through the protective net, it will lose a part of kinetic energy, thereby reducing to a certain extent the possibility of the dripping water moving further forward. Moreover, the protective net can also prevent foreign matter from falling into the air duct of the air guide structure.

[0112] According to the air cooling system of the high-voltage inverter involved in the present invention, by providing a base, the air guide structure can be stably fixed relative to the cabinet top of the cabinet.

[0113] The air cooling system of the high-voltage inverter involved in the present invention is described above, but the implementation is proposed as an example and is not intended to limit the scope of the invention. The implementation can be implemented in various other ways, and various omissions, substitutions, and changes can be made without departing from the scope of the subject matter of the invention. These implementations and their variations are included in the scope or subject matter of the invention, and are also included in the invention described in the claims and the scope of their equivalents.

Claims

1. An air cooling system for a high voltage inverter, The high-voltage frequency converter (1) comprises: A cabinet (11) containing electrical equipment; and The door panel (12) can be opened and closed for the cabinet, and is provided with a plurality of air inlets for cooling air to enter the interior of the cabinet, wherein: The air cooling system has: A fan (2) is arranged on the top of the cabinet, comprising a fan body and a fan frame for accommodating the fan body, an air inlet for communicating with the interior of the cabinet is formed on the bottom surface of the fan frame, and an air outlet is formed on the side surface of the fan frame; and The air guide structure (3) is connected to the air outlet of the fan and is arranged on the top of the cabinet, and comprises an air duct base part (31). The air duct base (31) forms an air duct with one end connected to the air outlet of the fan and the other end open upward to communicate with the outside air as the open side. The air guide structure discharges the air, which becomes hot air as a result of flowing through the interior of the cabinet, upward through the air duct.

2. The air cooling system for a high voltage frequency converter according to claim 1, characterized in that: The air outlet is formed on a side surface of the fan frame facing the same direction as the door panel.

3. The air cooling system for a high voltage frequency converter according to claim 1, characterized in that: The air duct base part (31) comprises: a straight duct portion (31A) located at one end of the air duct and formed in a square shape; and The arc-shaped duct portion (31B) is formed continuously with the straight duct portion at the other end side of the air duct, and the continuous surface continuous with the bottom surface of the straight duct portion is a curved surface that curves upward.

4. The air cooling system for a high voltage frequency converter according to claim 3, characterized in that: The air guide structure (3) comprises: The air duct opening and closing component (33A, 33B) is arranged in the straight duct portion and has a plurality of plate-shaped parts (331A, 331B) that open and close the air duct in accordance with the wind pressure in the air duct to open and close the air duct.

5. The air cooling system for a high voltage frequency converter according to claim 4, characterized in that: The plurality of plate-like portions are arranged in a vertical direction in the air duct opening and closing member, and are rotated in accordance with the wind pressure to perform the opening and closing operation.

6. The air cooling system for a high voltage frequency converter according to claim 5, characterized in that: When the fan is not working, the plurality of plate-like parts hang down due to their own weight in a manner that two adjacent plate-like parts partially overlap each other, thereby closing the air duct. When the fan is in operation, the plurality of plate-shaped portions are respectively rotated by a predetermined angle, thereby opening the air duct.

7. The air cooling system for a high voltage frequency converter according to any one of claims 4 to 6, characterized in that: The straight duct portion is provided with two air duct opening and closing members (33A, 33B) at a predetermined interval.

8. The air cooling system for a high voltage frequency converter according to claim 7, characterized in that: The wind guide structure is provided with a water stop rib (34) between the two wind duct opening and closing components (33A, 33B). The water stop rib blocks dripping water that has entered through the air duct opening and closing member (33A) on the open side of the air duct from advancing further.

9. The air cooling system for a high voltage frequency converter according to any one of claims 3 to 6, characterized in that: A drainage groove (37) is formed at the bottom of the straight pipe portion to drain dripping water.

10. The air cooling system for a high voltage frequency converter according to any one of claims 3 to 6, characterized in that: Sound-absorbing cotton (35) is laid on at least one of the bottom surface of the straight pipe part and the curved surface of the arc-shaped pipe part.

11. The air cooling system for a high voltage frequency converter according to any one of claims 3 to 6, characterized in that: A drainage groove (37) is formed at the bottom of the straight pipe portion to drain the dripping water. A sound-absorbing cotton (35) is laid on the bottom surface of the straight pipe portion. The portion of the sound-absorbing cotton that overlaps with the drainage groove is cut away.

12. The air cooling system for a high voltage frequency converter according to any one of claims 1 to 6, characterized in that: The wind guide structure is provided with a protective net (36) on the end surface of the open side of the wind duct.

13. The air cooling system for a high voltage frequency converter according to any one of claims 1 to 6, characterized in that: The air guide structure is arranged on the top of the cabinet via a base (32).

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