Air cooling system of high-voltage frequency converter

Abstract

The utility model 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 utility model relates to the air cooling system of high voltage frequency converter, especially the air cooling system of high voltage frequency converter with air guide structure. BACKGROUND

[0002] The high voltage frequency converter houses a large amount of electrical equipment in the cabinet, and as a high-power frequency modulation power supply device, the electrical equipment with the power conversion unit and the transformer in the cabinet will generate a large amount of heat during operation. Therefore, a stable heat dissipation system is needed to dissipate the heat inside to prevent the electrical equipment inside from being damaged. 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] Generally, the fan of the air cooling system is arranged on the top of the cabinet of the power control device. The fan sucks in cooling air from the air inlet hole of the door panel of the cabinet, and the sucked cooling air exchanges heat with the air in the cabinet to become hot air, which is then discharged to the outside of the cabinet through the fan, thereby achieving heat dissipation in the cabinet of the high voltage frequency converter.

[0004] In the air cooling system of the conventional high voltage frequency converter, as shown in Figure 11 , when the air outlet of the fan is directed to the side, the hot air is directly discharged horizontally to the front through the air outlet. Therefore, most of the discharged heat is dissipated around the fan, and the temperature around the fan is too high, which reduces the service life of the fan.

[0005] In addition, the rotation of the fan produces a lot of noise, as shown in Figure 11 , due to the air outlet of the fan being directed to the side, the direction of the hot air discharge and the air flow, the noise at the air outlet direction of the high voltage frequency converter is too high, which directly affects the noise test accuracy of the noise test point. Therefore, there is a problem of noise level increase caused by the air discharge direction.

[0006] In addition, especially when the air outlet of the fan and the door panel of the cabinet are directed to the same direction, i.e. the air outlet is formed in the front, as shown in Figure 11 , there is a problem of reduced heat dissipation performance caused by "air short circuit" between the air outlet direction of the fan and the air inlet direction of the door panel. So-called "air short circuit" means that the air outlet direction of the fan and the air inlet direction of the door panel are in the same direction, and the hot air discharged from the fan is sucked into the working cabinet through the air inlet hole of the door panel.

[0007] In addition, in the air cooling system of the conventional high voltage frequency converter, as shown in Figure 11 , the water droplets falling on the top of the cabinet are easily invaded through the air outlet of the fan, so there is a problem of being unable to prevent water droplets. UTILITY MODEL CONTENT

[0008] The utility model discloses in view of above -mentioned's problem makes, its purpose is at avoiding the fan around temperature is too high, reduce the noise, avoid wind short circuit's time realization the drip-proof high pressure frequency changer's air cooling system.

[0009] In order to solve above-mentioned's problem, the utility model discloses high pressure frequency changer's air cooling system, the high pressure frequency changer has: cabinet, and the electrical equipment is housed, and the door board can open and close cabinet, and form multiple air inlets for the air of cooling to enter the inside of cabinet, the air cooling system has: fan, set up in the cabinet roof, and has fan main body and the fan frame that houses this fan main body, and the air inlet for communicating with the inside of cabinet is formed in the bottom surface of fan frame, and the air outlet is formed in the side surface of fan frame, and the air guide structure is set up in the cabinet roof with the air outlet of fan, and has the air duct base body part, and the air duct base body part (31) forms one end with the air outlet of fan communication, and the other end is open to the upper direction and as open side with external air communication air duct, and the air guide structure is discharged to the upper direction through the air duct with the air that becomes hot air due to flowing through the inside of cabinet.

[0010] The utility model discloses high pressure frequency changer's air cooling system also can be, and the air outlet is formed on the side surface of fan frame with the same orientation of door board.

[0011] The utility model discloses high pressure frequency changer's air cooling system also can be, and the air duct base body part includes: straight pipe portion, is located one end side of the air duct, and forms the square shape, and the arc pipe portion is continuously formed with straight pipe portion on the other end side of the air duct, and the continuous surface of the bottom surface of straight pipe portion is curved to the upper direction.

[0012] The utility model discloses high pressure frequency changer's air cooling system also can be, and the air guide structure has: air duct opening and closing part, is arranged in straight pipe portion, and has multiple plate shapes that open and close the air duct with the wind pressure corresponding action and open and close the air duct.

[0013] The utility model discloses high pressure frequency changer's air cooling system also can be, and the multiple plate shapes are arranged in the air duct opening and closing part along the up and down direction, and the opening and closing action is carried out by rotating with the wind pressure.

[0014] The utility model relates to high pressure frequency converter's air cooling system also can be, when the fan does not work, the plurality of plate shape portion respectively due to self weight and with adjacent two plate shape department each other partial overlapping mode hangs down, thereby closes the air duct, when the fan works, the plurality of plate shape portion rotates the angle of stipulation respectively, thereby opens the air duct.

[0015] The utility model relates to high pressure frequency converter's air cooling system also can be, in the straight pipeline portion, two air duct opening and closing parts are arranged across the stipulated interval.

[0016] The utility model relates to high pressure frequency converter's air cooling system also can be, the air guide structure is provided with the water stop rib between two air duct opening and closing parts, and the water stop rib blocks the further advance of the water drop that enters via the air duct opening and closing part of the open side of the air duct.

[0017] The utility model relates to high pressure frequency converter's air cooling system also can be, the drain groove that can discharge water drop is formed in the bottom of the straight pipeline portion.

[0018] The utility model relates to high pressure frequency converter's air cooling system also can be, at least one of the bottom surface of the straight pipeline portion and the curved surface of the arc pipeline portion is paved with sound absorption cotton.

[0019] The utility model relates to high pressure frequency converter's air cooling system also can be, the drain groove that can discharge water drop is formed in the bottom of the straight pipeline portion, sound absorption cotton is paved in the bottom surface of the straight pipeline portion, and the portion of the sound absorption cotton that overlaps the drain groove is cut.

[0020] The utility model relates to high pressure frequency converter's air cooling system also can be, the air guide structure is installed with the protective net on the end face of the open side of the air duct.

[0021] The utility model relates to high pressure frequency converter's air cooling system also can be, the air guide structure is set up in the cabinet top of the cabinet via the base.

[0022] According to the air cooling system of high pressure frequency converter, can realize the anti-dripping water while avoiding the temperature of fan around is too high, reduces the noise, avoids the wind short circuit. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is the perspective drawing of the whole structure of high pressure frequency converter related to an embodiment of the utility model.

[0024] Figure 2 It is the schematic diagram of air flow when the fan works in the air cooling system of high pressure frequency converter related to an embodiment of the utility model.

[0025] Figure 3 is a perspective view showing a wind guide structure in a forced air cooling system of a high voltage frequency converter according to an embodiment of the present application.

[0026] Figure 4 is a perspective view showing a wind guide structure in a forced air cooling system of a high voltage frequency converter according to an embodiment of the present application, as viewed from another angle.

[0027] Figure 5 is a perspective view showing a wind guide structure in a forced air cooling system of a high voltage frequency converter according to an embodiment of the present application, as viewed from a side connected to an air outlet of a fan.

[0028] Figure 6 is a view showing a duct opening and closing member provided in a wind guide structure in a forced air cooling system of a high voltage frequency converter according to an embodiment of the present application.

[0029] Figure 7 is a view showing opening and closing of a plate-shaped portion of a duct opening and closing member in a forced air cooling system of a high voltage frequency converter according to an embodiment of the present application, in which a left side shows a view of the plate-shaped portion when closed when a fan is not operating, and a right side shows a view of the plate-shaped portion when opened when the fan is operating.

[0030] Figure 8 is a side view showing an example of a water stopping rib provided in a wind guide structure in a forced air cooling system of a high voltage frequency converter according to an embodiment of the present application.

[0031] Figure 9 is a view showing flow of water drops when a fan is not operating in a forced air cooling system of a high voltage frequency converter according to an embodiment of the present application.

[0032] Figure 10 is a view showing flow of water drops when a fan is operating in a forced air cooling system of a high voltage frequency converter according to an embodiment of the present application.

[0033] Figure 11 is a view showing a forced air cooling system of a high voltage frequency converter according to a related art.

[0034] Explanation of Reference Numerals

[0035] 1… high voltage frequency converter (high voltage frequency converter), 11… cabinet, 12… door panel,

[0036] 2… fan,

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

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

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

[0040] The embodiments of the present application will be described in detail below with reference to the drawings. It is obvious, however, that the described embodiments are merely examples and thus do not limit the scope of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0041] <EMBODIMENT>

[0042] Figure 1 is a perspective view showing the overall configuration of a high voltage frequency converter according to an embodiment of the present application. Figure 2 is a schematic view showing the flow of air in an air cooling system of a high voltage frequency converter according to an embodiment of the present application.

[0043] As shown in Figure 1 , the air cooling system according to the present embodiment is provided on the top of a cabinet of a high voltage frequency converter 1.

[0044] The high voltage frequency converter 1, as a power control device, houses various electrical equipment such as semiconductor elements, conductors, fuses, capacitors, transformers, switches, circuit breakers, and measuring devices, etc. in the cabinet.

[0045] In the present embodiment, the cabinet 11 of the high voltage frequency converter 1 is formed, for example, as an integrated cabinet housing a power conversion unit and a transformer side by side in the cabinet body.

[0046] As shown in Figure 1 , the cabinet body 11 has, for example, a box shape. A door panel 12 that opens and closes the cabinet body is provided on the front side of the cabinet 11. A plurality of air inlet holes (not shown) for the air for cooling to enter are formed on the door panel 12, and an air filter (not shown) is provided for each of the plurality of air inlet holes. The air filter, for example, has a mesh shape with a plurality of through holes, and can separate and trap foreign matter such as dust from the air flowing into the inside of the cabinet 11 from the air inlet holes 3 through the plurality of through holes, to ensure the cleanliness of the inside of the cabinet 11. Further, at least one air outlet hole (not shown) for discharging the air (hot air) that has been heat-exchanged inside the cabinet 11 from the cabinet 11 is formed on the top surface of the cabinet 11.

[0047] In the present embodiment, as shown in Figure 1As shown, the air cooling system is provided with a fan 2 and an air guide structure 3.

[0048] The fan 2 is, for example, a centrifugal fan, and is provided with a fan main body and a fan frame that houses the fan main body. An air inlet for communicating with the inside of the cabinet 11 is formed on the bottom surface of the fan frame, and the fan frame is disposed on the cabinet top of the cabinet 11 in such a manner that the air inlet faces the exhaust port of the cabinet 11. Thus, the inside of the cabinet 11 is communicated with the fan 2 via the air inlet of the fan and the exhaust port of the cabinet. Figure 1 An example in which an air outlet is formed on the front side surface that faces forward like the door panel 12 is shown in FIG. 8. The fan 2 is configured to discharge the hot air sucked from the exhaust port of the cabinet 11 via the air outlet.

[0049] Figure 2 The air flow when the fan 2 is operating is shown in FIG. 9. When the fan 2 is operating, a negative pressure is generated in the cabinet 11 by the air supply of the fan 2. Thus, as shown in FIG. 10, the air for cooling is sucked from the outside via the air inlet hole of the door panel 12, flows through the inside of the cabinet 11 to exchange heat with the air in the cabinet 11, becomes hot air after the heat exchange, is sucked from the exhaust port of the cabinet 11 by the fan 2 via the air inlet, and is finally discharged to the outside via the air guide structure 3. Figure 2 As shown in FIG. 11, the air guide structure 3 is provided on the cabinet top 11 of the cabinet,

[0050] As shown in FIG. 12, the air guide structure 3 is provided on the cabinet top 11 of the cabinet, Figure 1 As shown in FIG. 13, the air guide structure 3 is provided on the cabinet top 11 of the cabinet, Figures 3 to 6 The detailed configuration of the air guide structure is shown in FIG. 14.

[0051] As shown in FIG. 15, the air guide structure 3 is provided on the cabinet top 11 of the cabinet, Figure 3 , Figure 4 As shown in FIG. 16, the air guide structure 3 is provided on the cabinet top 11 of the cabinet,

[0052] Further, the air duct base portion 31 includes a straight duct portion 31A that is located on the one end side of the air duct and is formed in a square shape, and an arc-shaped duct portion 31B that is continuously formed on the other end side of the air duct with the straight duct portion 31A. A continuous surface that is continuous with the bottom surface of the straight duct portion 31A is a curved surface that curves upward.

[0053] In FIG. 17, a broken line that is imaginary and shown only for the purpose of easy understanding and does not exist in the actual structure is shown at the boundary position of the straight duct portion 31A and the arc-shaped duct portion 31B. Figure 3 Figure 3 ​In the middle, the right end corresponds to one end of the air duct, which is also the upstream direction of the air 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 air flow in the air duct. The part to the right of the dotted line corresponds to the straight pipe section 31A, and the part to the left of the dotted line corresponds to the curved pipe section 31B.

[0054] One end of the air duct of the air guide structure 3 (the open end of the straight pipe section 31A) is connected to the air outlet of the fan 2. Therefore, it receives the hot air (referred to as hot air) discharged from the air outlet of the fan 2. Then, the hot air is guided along the straight pipe section 31A and the curved pipe section 31B, and finally discharged upward to the outside through the other end of the air duct (the open end of the curved pipe section 31B).

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

[0056] The main components of the air guide structure 3 will be explained below.

[0057] like Figure 3 and Figure 4 As shown, the air guiding structure 3 mainly includes: two air duct opening and closing components 33A and 33B, which are arranged opposite each other at a predetermined interval in the airflow direction. When the fan 2 is working, the air duct formed by the air duct base 31 is opened, and when the fan 2 is not working, the air duct formed by the air duct base 31 is closed; a water-stopping rib 34, located between the two air duct opening and closing components 33A and 33B, to prevent dripping water entering through the air duct opening and closing component 33A located on the other end side (outside the air duct) from advancing further; and a mounting frame 30 for installing the two air duct opening and closing components 33A and 33B and the mounting frame 30. The two air duct opening and closing components 33A and 33B and the mounting frame 30 are installed in the straight pipe section 31A.

[0058] like Figure 4 As shown, the mounting frame 30 is, for example, formed into a rectangular tube shape corresponding to the straight pipe section 31A. At least the outer surface of the bottom and the outer surface of the sides need to be in contact with the inner surface of the bottom and the inner surface of the sides of the straight pipe section 31A. The outer surface of the top may or may not be in contact with the inner surface of the straight pipe section 31A. Therefore, when the mounting frame 30 is installed as a whole within the straight pipe section 31A with two duct opening / closing components 33A and 33B and a water-stop rib 34 installed, the mounting frame 30 and the parts of the straight pipe section 31A through which water easily passes can be in close contact.

[0059] Next, the specific composition of the air duct opening and closing components 33A and 33B will be explained.

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

[0061] Hereinafter, the air duct opening and closing member 33A will be described as an example.

[0062] Figure 7 A schematic view showing opening and closing of the plate-shaped portion 331A of the air duct opening and closing member 33A is shown, and the left side shows a view of the plate-shaped portion in the closed state when the fan is not operating, and the right side shows a view of the plate-shaped portion in the open state when the fan is operating.

[0063] As Figure 7 shown, in the air duct opening and closing member 33A, each of the plurality of plate-shaped portions 331A is installed to the installation frame 30 in a rotatable manner via a rotation shaft 332A. The outer shape of the plate-shaped portion 331A corresponds to the shape of the installation frame 30, and is, for example, a long rectangular plate shape in which the up-down direction is shorter and the length between the two side edges of the installation frame 30 is longer.

[0064] Specifically, for example, a plurality of rotation shafts 332A are installed in the up-down direction on each of the one side and the other side of the installation frame 30. One plate-shaped portion 331A is supported at both ends in the lengthwise direction on one rotation shaft 332A formed on the one side and another rotation shaft 332A formed on the other side and located at the same height as the one rotation shaft. Thus, between the one side and the other side of the installation frame 30, a plurality of plate-shaped portions 331A arranged in the up-down direction as the direction of gravity are supported by the shafts, and the plate-shaped portions 331A rotate together with the rotation shafts 332A around the central axis of the rotation shaft 332A. The central axis of the rotation shaft 332A is, for example, parallel with the long edge direction of the plate-shaped portion 331A.

[0065] The plurality of plate-shaped portions 331A can rotate in response to the wind pressure in the air duct formed by the air duct base portion 31 to perform opening and closing operations, thereby opening and closing the air duct formed by the air duct base portion 31.

[0066] As Figure 7 shown on the left side, when the fan 2 is not operating, the plurality of plate-shaped portions 331A are lowered due to the weight, and are in the closed state, and any two plate-shaped portions 331A adjacent in the up-down direction overlap each other in part in the closed state.

[0067] As Figure 7As shown on the right, when the fan 2 is operating, due to the airflow from the fan 2, each plate-shaped portion 331A bears the pressure (wind pressure) of the airflow F entering the air duct formed by the airflow from the air outlet of the fan 2 and one end of the air duct into the air duct base portion 31. When the wind pressure borne by each plate-shaped portion 331A reaches a predetermined level or higher, an opening action is performed to rotate around the central axis C of the rotation shaft 332A, thus opening the air duct. Here, the predetermined level of wind pressure is the force that causes the plate-shaped portion 331A to rotate around the central axis C against its own weight and the friction of the rotation shaft 332A.

[0068] When the wind pressure borne by each plate-shaped part 331A is less than the specified value mentioned above, it becomes a posture in which the air duct is closed by its own weight.

[0069] In addition, such as Figure 7 As shown, an opening limiting member 333A is installed for each plate-shaped portion 331A. Each opening limiting member 333A is, for example, parallel to the rotation axis 332A of each plate-shaped portion 331A, and is fixed to the side of the mounting frame 30 at a position on the other side of the plate-shaped portion 331A closer to the air duct than the plate-shaped portion 331A.

[0070] Each opening limiting member 333A restricts the maximum rotation angle of each plate-shaped portion 331A, thereby limiting the degree of opening of the air duct. For example, when the tilt angle θ of each plate-shaped portion 331A relative to the downward direction is less than a predetermined angle, each opening limiting member 333A does not contact the plate-shaped portion 331A, allowing the plate-shaped portion 331A to rotate about the central axis C. When the tilt angle θ of the plate-shaped portion 331A becomes a predetermined angle, each opening limiting member 333A contacts the plate-shaped portion 331A, thereby limiting further rotation of the plate-shaped portion 331A and prohibiting an increase in the tilt angle θ.

[0071] The specified angle is the maximum rotation angle of the plate-shaped portion 331A. Each opening limiting component 333A allows rotation of the plate-shaped portion 331A with a tilt angle θ smaller than the specified angle, and prohibits rotation of the plate-shaped portion 331A with a tilt angle θ larger than the specified angle. If the specified angle is greater than 90°, the plate-shaped portion 331 will be in a roughly horizontal state, and water dripping W can easily pass between adjacent plate-shaped portions. Therefore, in order to ensure anti-drip performance, the specified angle is at least less than 90°. With a specified angle of 60°, both hot air exhaust and anti-drip performance can be taken into account, so it is preferred.

[0072] The air duct opening and closing member 33B is identical to the air duct opening and closing member 33A except for the arrangement position, and has a plate-shaped portion 331B, a rotation shaft 332B, and an opening degree restricting member 333B identical to the plate-shaped portion 331A, the rotation shaft 332A, and the opening degree restricting member 333A, and operates in the same manner as the air duct opening and closing member 33A, so the repeated description is omitted.

[0073] Next, the detailed configuration of the water stopping rib 34 will be described.

[0074] As described above, the water stopping rib 34 is arranged between the two air duct opening and closing members 33A, 33B, and blocks further advancement of the dripping water that has entered from the air duct opening and closing member 33A on the other end side (the outside of the air duct) of the air duct.

[0075] As shown in Figs. 1 and 2, the water stopping rib 34 is arranged in the installation frame 30, for example, near the air duct opening and closing member 33A on the other end side (the outside of the air duct) of the air duct closer to the air duct opening and closing member 33B. Figure 3 Figure 6 As shown in Figs. 1 and 2, the water stopping rib 34 is arranged in the installation frame 30, for example, near the air duct opening and closing member 33A on the other end side (the outside of the air duct) of the air duct closer to the air duct opening and closing member 33B.

[0076] As shown in Figs. 1 and 2, the water stopping rib 34 is arranged in the installation frame 30, for example, near the air duct opening and closing member 33A on the other end side (the outside of the air duct) of the air duct closer to the air duct opening and closing member 33B. Figure 8 As shown in Figs. 1 and 2, the water stopping rib 34 is arranged in the installation frame 30, for example, near the air duct opening and closing member 33A on the other end side (the outside of the air duct) of the air duct closer to the air duct opening and closing member 33B.

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

[0078] As shown in Figs. 1 and 2, the water stopping rib 34 is arranged in the installation frame 30, for example, near the air duct opening and closing member 33A on the other end side (the outside of the air duct) of the air duct closer to the air duct opening and closing member 33B. Figure 3 Figure 5 As shown in Figs. 1 and 2, the water stopping rib 34 is arranged in the installation frame 30, for example, near the air duct opening and closing member 33A on the other end side (the outside of the air duct) of the air duct closer to the air duct opening and closing member 33B.

[0079] As shown in Figs. 1 and 2, the water stopping rib 34 is arranged in the installation frame 30, for example, near the air duct opening and closing member 33A on the other end side (the outside of the air duct) of the air duct closer to the air duct opening and closing member 33B. Figure 3 As shown in Figs. 1 and 2, the water stopping rib 34 is arranged in the installation frame 30, for example, near the air duct opening and closing member 33A on the other end side (the outside of the air duct) of the air duct closer to the air duct opening and closing member 33B.

[0080] ​​Further, as Figure 3 , 4 , shown in FIG. 6, the air guide structure 3 is provided with a protective screen 36 at the end of the other end of the air duct, i.e., the end face 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, quadrangular, and the protective screen 36 is also formed in quadrangular shape accordingly.

[0081] <Modification>

[0082] The above describes the air cooling system of the high-voltage frequency converter according to an embodiment, but the present application is not limited to this embodiment, and various modifications can be made as described below.

[0083] The above embodiment describes the case where the air duct opening and closing member is provided with two air duct opening and closing members 33A and 33B, but it can also be configured to be provided with only the air duct opening and closing member 33A. Even if only the air duct opening and closing member 33A is provided, by cooperating the air duct opening and closing member 33A with the drain groove 37, the drip-proof effect can be basically ensured.

[0084] The above embodiment describes the case where the water-stopping rib is formed in a frame shape open upward, which is because, since the dripping water has the characteristic of flowing downward along the direction of gravity, the dripping water staying at the upper side of the two side edges is little, and, on the contrary, the lower edge of the air duct opening and closing member 33A and the lower side of the two side edges are the key positions for preventing dripping water, so the water-stopping rib is provided at least for the key positions as described above. However, it can also be that the water-stopping rib is formed in a closed frame shape along the entire outer periphery of the air duct opening and closing member 33A. In this case, the drip-proof effect can be achieved for the entire circumference of the air duct opening and closing member 33A.

[0085] Next, referring to Figure 7 , Figure 9 , Figure 10 the operation of the air cooling system according to the above embodiment will be described.

[0086] When the high-voltage frequency converter is not working and the fan is not working

[0087] When the high-voltage frequency converter is not working, the fan 2 is not working, as shown in the left side of Figure 7 , the plurality of plate-shaped portions 331A and 331B of the air duct opening and closing members 33A and 33B are in a closed state due to gravity, and at this time the air duct is also in a closed state.

[0088] At this time, as shown in Figure 9 , when there is dripping water in the external environment, the dripping water enters the air duct formed by the air duct base portion 31 through the protective screen 36. It can be conceived that the dripping water includes falling dripping water falling vertically to the bottom surface of the air duct, and inclined dripping water falling toward the air duct opening and closing member with an inclination angle with respect to the vertical direction.

[0089] In the case of the falling drop, the drop falls on the back of the air duct bottom surface and splashes, at this time, the plurality of plate-shaped portions 331A of the air duct opening and closing member 33A are in the closed state, therefore, even if the drop splashes on the air duct opening and closing member 33A, the splashed drop cannot pass through the air duct opening and closing member 33A in the closed state, but flows down along the air duct opening and closing member 33A in the direction of gravity, and finally is discharged to the outside of the cabinet through the drain groove 37.

[0090] In this case, since the sound absorbing cotton 35 is laid on the air duct base portion 31, when the falling drop falls on the sound absorbing cotton 35, a part of kinetic energy is absorbed, the speed of the splashed drop is reduced, some drops lose the kinetic energy to further advance and do not splash toward the air duct opening and closing member 33A, but directly flow along the air duct bottom surface and are discharged to the outside of the cabinet through the drain groove 37. Moreover, since the water stopping rib 34 is provided for the air duct opening and closing member 33A, even if the drop penetrates along the lower edge and the lower side portions of the two side edges of the air duct opening and closing member 33A, the water stopping rib 34 can block the further advance. In theory, the drop after passing through the air duct opening and closing member 33A and the water stopping rib 34 basically loses the kinetic energy to advance and cannot splash, even if it is assumed that the drop further splashes on the air duct opening and closing member 33B, since the plurality of plate-shaped portions 331B of the air duct opening and closing member 33B are in the closed state, the splashed drop cannot pass through the air duct opening and closing member 33B in the closed state, but flows down along the air duct opening and closing member 33B in the direction of gravity, and finally is discharged to the outside of the cabinet through the drain groove 37.

[0091] In the case of the falling drop, the drop falls on the back of the air duct bottom surface and splashes, at this time, the plurality of plate-shaped portions 331A of the air duct opening and closing member 33A are in the closed state, therefore, even if the drop splashes on the air duct opening and closing member 33A, the splashed drop cannot pass through the air duct opening and closing member 33A in the closed state, but flows down along the air duct opening and closing member 33A in the direction of gravity, and finally is discharged to the outside of the cabinet through the drain groove 37.

[0092] In this case, as described above, since the water stopping rib 34 and the air duct opening and closing member 33B are also provided, the further advance of the drop after passing through the air duct opening and closing member 33A can be blocked.

[0093] When the high-voltage frequency converter is in the working state, the fan works 2, as shown on the right side of FIG. 6, the plurality of plate-shaped portions 331A, 331B of the air duct opening and closing members 33A, 33B are opened due to the wind pressure of the fan air supply, and become the hot air F passing through the adjacent plate-shaped portions 331A, 331B and then passing through the protective net 36, and is vertically upwardly discharged. At this time, the plurality of plate-shaped portions 331A, 331B of the air duct opening and closing members 33A, 33B are in the opened state, but the opening degree does not reach the horizontal degree.

[0094] When the high-voltage frequency converter is in the working state, the fan works 2, as shown on the right side of FIG. 6, the plurality of plate-shaped portions 331A, 331B of the air duct opening and closing members 33A, 33B are opened due to the wind pressure of the fan air supply, and become the hot air F passing through the adjacent plate-shaped portions 331A, 331B and then passing through the protective net 36, and is vertically upwardly discharged. At this time, the plurality of plate-shaped portions 331A, 331B of the air duct opening and closing members 33A, 33B are in the opened state, but the opening degree does not reach the horizontal degree. Figure 7 ​

[0095] As Figure 9 shown, when there is water dripping from the outside environment, the water drips through the protective net 36 into the air duct formed by the air duct base portion 31. It is conceivable that the water dripping includes vertically falling water that falls vertically to the bottom surface of the air duct, and inclined water that falls toward the air duct opening and closing member with an inclination angle with respect to the vertical direction.

[0096] In the case of the water dripping being vertically falling water, the water falling to the bottom surface splashes. At this time, since the plurality of plate portions 331A of the air duct opening and closing member 33A are opened with an opening degree that does not reach the horizontal level, a part of the water splashing from the bottom surface collides with the plurality of plate portions 331A, most of which are blocked by the plurality of plate portions 331A, and flows down along the air duct opening and closing member 33A in the direction of gravity, and finally is discharged to the outside of the cabinet via the drain groove 37, and a very small part of which is bounced again by the plate portion 331A and continues to advance toward the air duct opening and closing member 33B by passing between the adjacent plate portions 331A. In addition, another part of the water splashing from the bottom surface also continues to advance toward the air duct opening and closing member 33B by passing between the adjacent plate portions 331A. The water dripping that passes between the adjacent plate portions 331A will lose the kinetic energy to further advance under the action of the wind pressure, and falls without reaching the air duct opening and closing member 33B, or reaches the air duct opening and closing member 33B and is blocked to flow down along the plurality of plate portions 331B in the direction of gravity, and finally is discharged to the outside of the cabinet via the drain groove 37.

[0097] In the case of the water dripping being inclined water, the water falls toward the plurality of plate portions 331A as shown on the right side of Figure 7 At this time, since the plurality of plate portions 331A of the air duct opening and closing member 33A are opened with an opening degree that does not reach the horizontal level, a part of the water falling toward the plurality of plate portions 331A collides with the plurality of plate portions 331A, most of which are blocked by the plurality of plate portions 331A, and flows down along the air duct opening and closing member 33A in the direction of gravity, and finally is discharged to the outside of the cabinet via the drain groove 37, and a very small part of which is bounced again by the plate portion 331A and continues to advance toward the air duct opening and closing member 33B by passing between the adjacent plate portions 331A. In addition, another part of the water falling toward the plurality of plate portions 331A also continues to advance toward the air duct opening and closing member 33B by passing between the adjacent plate portions 331A. The water dripping that passes between the adjacent plate portions 331A will lose the kinetic energy to further advance under the action of the wind pressure, and falls without reaching the air duct opening and closing member 33B, or reaches the air duct opening and closing member 33B and is blocked to flow down along the plurality of plate portions 331B in the direction of gravity, and finally is discharged to the outside of the cabinet via the drain groove 37.

[0098] In this case, the sound absorbing cotton 35 and the water stopping rib 34 play the same role as when the high-voltage frequency converter is not working and the fan is not working. In addition, during the working period of the fan, the noise of the hot air exhaust can be reduced under the action of the sound absorbing cotton 35, and accordingly, the noise value of the fan noise test point is also reduced.

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

[0100] The effect of the air cooling system of the high-voltage frequency converter according to the present application is described as follows.

[0101] According to the air cooling system of the high-voltage frequency converter, the air guide structure is additionally arranged for the fan, the air duct base body part of the air guide structure forms an air duct with one end communicated with the air outlet of the fan and the other end opened upward to be communicated with the external air, especially by arranging the other end of the air duct, i.e. the final exhaust port of the hot air, to be upward, so that the hot air is not directly discharged to the side as in the prior art but is discharged upward, therefore, the problem of excessively high temperature around the fan caused by the outlet air direction, excessive reduction and wind short circuit can be effectively avoided. Moreover, since the air guide structure is additionally arranged for the fan, the air outlet of the fan is not directly exposed to the ambient air, therefore, if the dripping water falling from the cabinet top wants to invade the fan, it needs to pass through the air guide structure first, increasing the difficulty of the dripping water invading the fan, and to a certain extent, the problem of preventing dripping water is solved. As can be seen, the air cooling system of the high-voltage frequency converter according to the present application can solve all the problems existing in the prior art by additionally arranging the air guide structure, can avoid excessively high temperature around the fan, reduce noise, and prevent wind short circuit while preventing dripping water.

[0102] According to the air cooling system of the high-voltage frequency converter, in the case that the air outlet direction of the fan and the door plate are in the same direction, so-called "wind short circuit" is more likely to occur, therefore, by having the air guide structure, the hot air is discharged upward, therefore, the condition that the hot air is directly discharged into the cabinet after being discharged to the side can be effectively avoided, and the generation of "wind short circuit" can be more effectively prevented.

[0103] According to the high-voltage frequency converter air cooling system, the part of the air duct connected with the air outlet of the fan is a straight pipe part, which can be easily connected with the shape of the air outlet, and since the bottom surface of the straight pipe part is a plane, some components can be conveniently installed on the bottom surface.

[0104] According to the high-voltage frequency converter air cooling system, the part of the air duct connected with the air outlet of the fan is a straight pipe part, which can be easily connected with the shape of the air outlet, and since the bottom surface of the straight pipe part is a plane, some components can be conveniently installed on the bottom surface.

[0105] According to the high-voltage frequency converter air cooling system, the part of the air duct connected with the air outlet of the fan is a straight pipe part, which can be easily connected with the shape of the air outlet, and since the bottom surface of the straight pipe part is a plane, some components can be conveniently installed on the bottom surface.

[0106] According to the high-voltage frequency converter air cooling system, the part of the air duct connected with the air outlet of the fan is a straight pipe part, which can be easily connected with the shape of the air outlet, and since the bottom surface of the straight pipe part is a plane, some components can be conveniently installed on the bottom surface.

[0107] According to the high-voltage frequency converter air cooling system, the part of the air duct connected with the air outlet of the fan is a straight pipe part, which can be easily connected with the shape of the air outlet, and since the bottom surface of the straight pipe part is a plane, some components can be conveniently installed on the bottom surface.

[0108] According to the high-voltage frequency converter air cooling system, the part of the air duct connected with the air outlet of the fan is a straight pipe part, which can be easily connected with the shape of the air outlet, and since the bottom surface of the straight pipe part is a plane, some components can be conveniently installed on the bottom surface.

[0109] According to the air cooling system of the high-voltage frequency converter, the sound-absorbing cotton is laid, noise can be reduced, and when the dripping water falls on the sound-absorbing cotton, compared with the case of directly falling on the bottom surface of the air duct, the degree of water splashing can be reduced, thereby further improving the anti-dripping effect.

[0110] According to the air cooling system of the high-voltage frequency converter, the sound-absorbing cotton is laid, noise can be reduced, and when the dripping water falls on the sound-absorbing cotton, compared with the case of directly falling on the bottom surface of the air duct, the degree of water splashing can be reduced, thereby further improving the anti-dripping effect.

[0111] According to the air cooling system of the high-voltage frequency converter, the sound-absorbing cotton is laid, noise can be reduced, and when the dripping water falls on the sound-absorbing cotton, compared with the case of directly falling on the bottom surface of the air duct, the degree of water splashing can be reduced, thereby further improving the anti-dripping effect.

[0112] According to the air cooling system of the high-voltage frequency converter, the sound-absorbing cotton is laid, noise can be reduced, and when the dripping water falls on the sound-absorbing cotton, compared with the case of directly falling on the bottom surface of the air duct, the degree of water splashing can be reduced, thereby further improving the anti-dripping effect.

[0113] The air cooling system of the high-voltage frequency converter is described above, but the embodiments are presented as examples and are not intended to limit the scope of the utility model. The embodiments can be implemented in other various ways, various omissions, substitutions, changes can be made within the scope of the utility model without departing from the spirit of the utility model. These embodiments and their modifications are included in the scope or spirit of the utility model, and are also included in the utility model and its equivalent range described in the claims.

Claims

1. An air cooling system of a high voltage inverter, The high voltage inverter (1) is provided with: a cabinet (11) in which an electrical device is accommodated; and a door panel (12) capable of opening and closing the cabinet, formed with a plurality of air inlet holes through which cooling air enters the inside of the cabinet, characterized in that the air cooling system is provided with: a fan (2) provided on the top of the cabinet, provided with a fan main body and a fan frame in which the fan main body is accommodated, an air inlet formed on the bottom surface of the fan frame for communication with the inside of the cabinet, and an air outlet formed on the side surface of the fan frame; and an air guide structure (3) provided on the top of the cabinet in connection with the air outlet of the fan, provided with an air duct base portion (31), the air duct base portion (31) forms an air duct in which one end communicates with the air outlet of the fan and the other end is open toward the upper side to communicate with the outside air, the air guide structure discharges air that has become hot air due to flowing through the inside of the cabinet upward via the air duct.

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

3. The air cooling system of a high voltage inverter according to claim 1, characterized in that the air duct base portion (31) includes: a flat duct portion (31A) located on one end side of the air duct and formed in a square shape; and an arc-shaped duct portion (31B) continuously formed on the other end side of the air duct with the flat duct portion, a continuous surface continuously with the bottom surface of the flat duct portion being a curved surface curved upward.

4. The air cooling system of a high voltage inverter according to claim 3, characterized in that the air guide structure (3) is provided with: an air duct opening and closing member (33A, 33B) disposed on the flat duct portion, provided with a plurality of plate-shaped portions (331A, 331B) that perform opening and closing operations in correspondence with the air pressure in the air duct to open and close the air duct.

5. The air cooling system of a high voltage inverter according to claim 4, characterized in that the plurality of plate-shaped portions are arranged in the air duct opening and closing member in the up and down direction and perform the opening and closing operations by rotating in correspondence with the air pressure.

6. The air cooling system of a high voltage inverter according to claim 5, characterized in that when the fan is not operating, the plurality of plate-shaped portions each fall downward in a manner in which two adjacent plate-shaped portions partially overlap each other due to their own weight, thereby closing the air duct, when the fan is operating, the plurality of plate-shaped portions each rotate by a predetermined angle, thereby opening the air duct.

7. The air cooling system of a high voltage inverter according to any one of claims 4 to 6, characterized in that two air duct opening and closing members (33A, 33B) are provided at a predetermined interval on the flat duct portion.

8. The air cooling system of a high voltage inverter according to claim 7, characterized in that the air guide structure is provided with a water stop rib (34) between the two air duct opening and closing members (33A, 33B), The water-stopping rib blocks further progress of the water drops that have entered via the opening side of the air duct through the air duct opening and closing member (33A).

9. The air cooling system of the high voltage frequency converter according to any one of claims 3 to 6, wherein A drain groove (37) capable of draining the water drops is formed at the bottom of the flat duct portion.

10. The air cooling system of the high voltage frequency converter according to any one of claims 3 to 6, wherein Sound absorbing cotton (35) is laid on at least one of the bottom surface of the flat duct portion and the curved surface of the arc duct portion.

11. The air cooling system of the high voltage frequency converter according to any one of claims 3 to 6, wherein A drain groove (37) capable of draining the water drops is formed at the bottom of the flat duct portion, Sound absorbing cotton (35) is laid on the bottom surface of the flat duct portion, The portion of the sound absorbing cotton that overlaps the drain groove is cut off.

12. The air cooling system of the high voltage frequency converter according to any one of claims 1 to 6, wherein A protective net (36) is installed on the end surface of the opening side of the air duct of the air guiding structure.

13. The air cooling system of the high voltage frequency converter according to any one of claims 1 to 6, wherein The air guiding structure is provided on the cabinet top of the cabinet via a base (32).

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