Sealing structure for air inlet surface and air outlet surface of power unit of high-voltage frequency converter

Abstract

The utility model belongs to the technical field of sealing structures, and particularly discloses a sealing structure for air inlet surfaces and air outlet surfaces of power units of a high-voltage frequency converter, a plurality of power units are arranged and mounted in a cabinet body of the high-voltage frequency converter, and a plurality of rows of unit mounting cross beams are arranged in the cabinet body of the high-voltage frequency converter. The plurality of power units are sequentially installed on the plurality of rows of unit installation cross beams, a first sealing strip is arranged between every two adjacent power units, the first sealing strips among the plurality of power units and the plurality of rows of unit installation cross beams define a plurality of sealing frames, and the sealing frames are located at air inlets of the power units. The air inlet panels on the plurality of power units are sequentially connected to the plurality of sealing frames, and the air inlet panels and the sealing frames form a sealing surface structure. According to the utility model, the over-temperature phenomenon of the frequency converter caused by untight sealing due to processing and assembling errors can be avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to a sealing structure technical field, concretely relates to a high pressure frequency converter power unit air inlet and outlet face sealing structure. BACKGROUND

[0002] In recent years, with the large number of high pressure frequency converters in market, the core power device of frequency converter of several brands manufacturers at home and abroad appears over temperature alarm and even damage situation. Since power device has important effect in frequency conversion system, and is high in value, once damage will lead to frequency conversion equipment itself economic loss. The paralysis of whole frequency conversion system causes unit unplanned shutdown, and will bring very big economic loss to user.

[0003] The above over temperature phenomenon is mainly due to that the air inlet and outlet face of power unit in high pressure frequency converter is not tightly closed, part cooling gas leaks to the air outlet face through the unsealed gap, the air volume through the radiator of power device is insufficient, the heat emitted by the radiator cannot be taken away in time, at this time, the running power device still emits heat, the heat accumulates, the temperature is higher and higher, when the temperature exceeds the limit set by the protection system of frequency converter, over temperature alarm is sent, when the accumulated temperature exceeds the maximum value that the device can withstand, the device damage occurs.

[0004] The air inlet and outlet sealing surface of the power unit in the conventional high pressure frequency converter on the market is at the air outlet face of power unit, once the power unit is not pushed into place (as shown in the drawing) or is inclined due to machining error (as shown in the drawing), the sealing at this place is not tight and is difficult to check, part cooling gas leaks to the air outlet face through the unsealed gap, the air volume through the radiator of power device is insufficient, over temperature alarm and device damage occur. In addition, the SMC partition plate used by the air inlet and outlet sealing surface of the power unit in the conventional high pressure frequency converter on the market has large area and high cost. Figure 9 Figure 10 The above over temperature phenomenon often occurs in the case that the environmental temperature is relatively high in summer, the high environmental temperature also causes the increase of power device itself power consumption, if the air inlet and outlet face of power unit in high pressure frequency converter is not tightly closed, eventually, power device over temperature alarm and even damage occur, leading to unplanned shutdown. INVENTION CONTENTS

[0005] The utility model provides a kind of air inlet and outlet face sealing structure of high pressure frequency converter power unit, to avoid the phenomenon that frequency converter appears over temperature due to the sealing not tight caused by machining, assembly error and difficult to check and correct.

[0006] The utility model provides a kind of air inlet and outlet face sealing structure of high pressure frequency converter power unit, to avoid the phenomenon that frequency converter appears over temperature due to the sealing not tight caused by machining, assembly error and difficult to check and correct.

[0007] ​The utility model discloses a high -pressure frequency converter power unit import, export wind surface sealing structure, power unit has a plurality of, a plurality of power unit arrangement installs in the cabinet of high -pressure frequency converter, and the cabinet of high -pressure frequency converter is equipped with multiple unit installation crossbeam, and a plurality of power unit is installed on multiple unit installation crossbeam in proper order, and the first sealing strip is equipped between two adjacent power units, and the first sealing strip between a plurality of power units and multiple unit installation crossbeam enclose a plurality of sealed frame, the sealed frame is located the air inlet of power unit, and the air inlet panel on a plurality of power units is connected on a plurality of sealed frame in proper order, and the air inlet panel and sealed frame form sealing surface structure.

[0008] Compared with the prior art, the present scheme has the following advantages and beneficial effects:

[0009] In the present scheme, the position of the sealing surface structure is adjusted, the original SMC partition plate at the air outlet of the power unit is cancelled, and the sealing surface structure is arranged at the air inlet of the power unit, thereby avoiding the problems of difficult inspection and acceptance, missed sealing, power device overheating caused by wind loss, and machine equipment failure caused by the sealing surface being too far from the cabinet door panel of the high-voltage frequency converter and being too narrow.

[0010] In addition, in the present scheme, the air inlet panel, the first sealing strip and the unit installation crossbeam form a sealing surface structure, and the adjacent air inlet panels are sealed by the first sealing strip, thereby avoiding the problems of insufficient perpendicularity caused by the machining or assembly error of the power unit body, leading to poor sealing, and ensuring the reliability of the sealing.

[0011] By moving the sealing surface of the power unit from the air outlet to the air inlet, the sealing frame formed by the unit installation crossbeam and the first sealing strip and the air inlet panel of the power unit form a sealing surface structure, thereby avoiding the problems of poor sealing caused by the unit not being pushed into place during installation and being difficult to observe, ensuring the reliability of the sealing, avoiding the problems of power device overheating caused by wind loss due to the leakage of the inlet and outlet air sealing surface caused by the inclination of the power unit caused by the machining error, and avoiding the problems of power device overheating caused by wind loss due to the leakage of the inlet and outlet air sealing surface caused by the unit not being assembled in place.

[0012] By moving the sealing surface of the power unit from the air outlet to the air inlet, the convenience of inspection and quality inspection personnel during assembly is improved, and by replacing the large-area SMC sealing plate at the air outlet with the first sealing strip, the amount of raw materials for the sealing surface is saved, and the cost is reduced.

[0013] Further, the upper part and the lower part of the air inlet panel are connected to the unit installation crossbeams located in the upper row and the lower row, respectively.

[0014] Beneficial effects: the upper and lower parts of the air inlet panel are connected with the unit installation beams, and form a rectangular frame structure with the first sealing strips and the unit installation beams.

[0015] Further, the upper and lower parts of the air inlet panel are respectively provided with second sealing strips between the unit installation beams of the upper and lower rows.

[0016] Beneficial effects: the second sealing strips can further enhance the sealing performance of the sealing surface structure.

[0017] Further, the side of the upper and lower parts of the air inlet panel facing the unit installation beams is provided with a sunken platform matching the unit installation beams.

[0018] Beneficial effects: the sunken platform structure on the unit installation beams can reserve a step structure on the upper and lower parts of the air inlet panel, which can position the unit installation beams, match the connection between the unit installation beams and the air inlet panel, reduce the thickness of the connection, facilitate the connection and fixation, and improve the connection firmness.

[0019] Further, the second sealing strip is located between the unit installation beam and the side wall of the sunken platform.

[0020] Beneficial effects: such arrangement can enhance the sealing performance of the connection between the unit installation beam and the air inlet panel, thereby ensuring the effectiveness of the power unit sealing surface.

[0021] Further, the second sealing strip is a flexible sealing strip.

[0022] Beneficial effects: the flexible second sealing strip can connect the unit installation beam and the air inlet panel flexibly, and compensate for the gap caused by the machining error.

[0023] Further, the second sealing strip is an EPDM sealing strip made of EPDM material.

[0024] Beneficial effects: the EPDM sealing strip can connect the unit installation beam and the air inlet panel flexibly, and has good weather resistance, chemical resistance and heat resistance.

[0025] Further, the unit installation beam has a cross-section in the shape of a Chinese character "。

[0026] Beneficial effects: such arrangement can make the unit installation beam have high structural strength and meet the sufficient creepage distance between two units.

[0027] Further, the first sealing strip is a sealing strip made of SMC material.

[0028] Beneficial effect: SMC material is an insulating material, which can effectively ensure the electrical safety distance between units while meeting the sealing effect, and by effectively controlling the unit spacing, the spacing between power units can be optimized to improve the power density of the whole machine.

[0029] Further, the air inlet panel is detachably connected with the unit mounting cross beam.

[0030] Beneficial effect: In this way, assembly is facilitated, and disassembly and maintenance can be conveniently performed according to actual conditions. BRIEF DESCRIPTION OF DRAWINGS

[0031] The drawings described herein are used to provide further understanding of the embodiments of the present application, constitute a part of the present application, and do not constitute a limitation of the embodiments of the present application. In the drawings:

[0032] Figure 1 Fig. 1 is a schematic diagram of the overall structure of a high-voltage frequency converter power unit air inlet and outlet surface sealing structure of the present application;

[0033] Figure 2 Fig. 2 is a sectional view of B-B in Fig. 1; Figure 1

[0034] Figure 3 Fig. 3 is a sectional view of A-A in Fig. 1; Figure 1

[0035] Figure 4 Fig. 4 is a partial schematic view in Fig. 1; Figure 1

[0036] Figure 5 Fig. 5 is a partial schematic view in Fig. 1; Figure 2

[0037] Figure 6 Fig. 6 is a partial schematic view of Fig. 1 after the functional unit is removed; Figure 2

[0038] Figure 7 Fig. 7 is a partial schematic view in Fig. 1; Figure 3

[0039] Figure 8 Fig. 8 is a partial enlarged view of C in Fig. 1; Figure 5

[0040] Figure 9 Fig. 9 is a schematic diagram of the state of the power unit assembly in the background technology without being pushed into place;

[0041] Figure 10 Fig. 10 is a schematic diagram of the state of the functional unit tilting due to machining error in the background technology.

[0042] Markings in the drawings and corresponding component names: ​​​​​​​

[0043] Power unit 1, unit installation beam 2, first sealing strip 3, air inlet panel 4, second sealing strip 5. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the utility model is further described in detail below in combination with examples and drawings, and the schematic embodiment of the utility model and its description are only used to explain the utility model and do not serve as the limitation of the utility model.

[0045] As shown in Figure 1 , Figure 2 and Figure 3 , the embodiment 1 provides a kind of high voltage frequency converter power unit air inlet and outlet face sealing structure, as shown in Figure 1 , power unit 1 has multiple, multiple power unit 1 is installed in the cabinet of high voltage frequency converter in neat arrangement, multiple unit installation beams 2 are equipped in the cabinet of high voltage frequency converter, multiple power unit 1 is installed on multiple unit installation beams 2 in turn, so that multiple power unit 1 forms multiple row structure.

[0046] As shown in Figure 4 , Figure 5 , Figure 6 and Figure 7 , first sealing strip 3 is equipped between adjacent two power unit 1, and the first sealing strip 3 between multiple power unit 1 and multiple unit installation beams 2 form multiple sealing frames, i.e. between the adjacent two first sealing strips 3 in the same row and the unit installation beams 2 of upper row and lower row are enclosed into rectangular sealing frame structure.

[0047] The sealing frame in the embodiment is located at the air inlet of power unit 1, as shown in Figure 5 , the direction indicated by arrow is the air inlet of power unit 1, and the wind from outside enters the air inlet panel 4 of power unit 1 along the direction indicated by arrow, and the air inlet panel 4 on multiple power unit 1 is connected on multiple sealing frames in turn, and the air inlet panel 4 and the sealing frame form sealing surface structure.

[0048] The upper part and the lower part of air inlet panel 4 are connected with the unit installation beams 2 in upper row and lower row respectively in the embodiment, and air inlet panel 4 and the unit installation beams 2 are detachably connected in the embodiment, and specifically: as shown in Figure 5 , air inlet panel 4 and unit installation beam 2 are detachably fixed by bolt, and the material of air inlet panel 4 and unit installation beam 2 is SMC material.

[0049] As shown in Figure 5As shown, the cross section of the unit mounting beam 2 in the embodiment is in the shape of a Chinese character, and the Chinese character-shaped structure of the unit mounting beam 2 in the embodiment is installed in the form of being rotated by 90° in the counterclockwise direction, and the upper portion and the lower portion of the air inlet panel 4 are both provided with a sunken platform which is matched with one side of the unit mounting beam 2, so that the upper portion and the lower portion of the air inlet panel 4 form a stepped structure, and one side of the unit mounting beam 2 in the upper row and the lower row is located at the sunken platform of the upper portion and the lower portion of the air inlet panel 4 respectively, and is locked and fixed by bolts, so that the connection between the air inlet panel 4 and the unit mounting beam 2 in the upper row and the lower row is completed.

[0050] In the embodiment, the first sealing strip 3 on each sealing frame is a sealing strip made of SMC material. Figure 4 As shown, the first sealing strip 3 in the embodiment is fixedly connected with the adjacent air inlet panel 4 by bolts, and in the embodiment, the first sealing strip 3 and the adjacent air inlet panel 4 are connected and fixed by three bolts which are distributed at intervals in the vertical direction.

[0051] In another embodiment, the first sealing strip 3 is made of EPDM material. Figure 5 And Figure 8 As shown, the upper portion and the lower portion of the air inlet panel 4 are both provided with a second sealing strip 5 between the unit mounting beam 2 in the upper row and the lower row, and the second sealing strip 5 is located between the side wall of the sunken platform of the unit mounting beam 2 and the air inlet panel 4.

[0052] The second sealing strip 5 is a flexible sealing strip, and specifically, the second sealing strip 5 in the embodiment is an EPDM sealing strip made of EPDM material, and the second sealing strip 5 is adhesively fixed with the air inlet panel 4 and the unit mounting beam 2.

[0053] The specific implementation process is as follows:

[0054] In the utility model, the position of the sealing surface on the high-voltage frequency converter cabinet is adjusted, and the original SMC partition plate (such as Figure 9 ) at the air outlet of the power unit 1 is cancelled, a first sealing strip 3 is arranged at the air inlet of the power unit 1 to cooperate with the unit mounting beam 2 to form a sealing frame, and the SMC air inlet panel 4 of the power unit 1 is matched with the sealing frame to form a sealing surface structure.

[0055] In order to ensure the effectiveness of the sealing, a circle of EPDM sealing strips is pasted on the SMC air inlet panel 4 of the power unit 1, which plays a role of flexible connection and makes up for the gap caused by partial machining error.

[0056] The utility model adjusts the position of the sealing surface, and the achievements obtained include:

[0057] 1), avoid the unit tilt due to processing error, into and out of the air leakage, resulting in air loss caused by power device overheating problem;

[0058] 2), avoid the unit assembly caused by the air leakage of into and out of the air leakage, resulting in air loss caused by power device overheating problem;

[0059] 3), avoid the sealing surface distance cabinet door too far, and too narrow caused by inspection acceptance difficult, leak detection problem, resulting in power device overheating problem;

[0060] 4), the utility model saves the cost on the conventional scheme, the SMC material quantity of sealing surface reduces 90%.

[0061] The present invention has been applied to 1500KVA four quadrant high voltage frequency converter, and good sealing effect is obtained.

[0062] It should be noted that the above description of the disclosed embodiments enables those skilled in the art to realize or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high-voltage frequency converter power unit air inlet and outlet face sealing structure, the power unit having a plurality of power units arranged and installed in a cabinet of the high-voltage frequency converter, the cabinet of the high-voltage frequency converter being provided with a plurality of rows of unit installation crossbeams, and the plurality of power units being sequentially installed on the plurality of rows of unit installation crossbeams, characterized in that, First sealing strips are arranged between two adjacent power units, the first sealing strips between the power units and the multiple rows of unit mounting beams form multiple sealing frames, the sealing frames are located at air inlets of the power units, air inlet panels on the multiple power units are sequentially connected to the multiple sealing frames, and the air inlet panels and the sealing frames form a sealed surface structure.

2. The high-voltage frequency converter power unit air inlet / outlet face sealing structure according to claim 1, characterized in that, Upper and lower portions of the air inlet panel are connected to unit mounting beams located in upper and lower rows, respectively.

3. The high-voltage frequency converter power unit air inlet / outlet face sealing structure according to claim 2, characterized in that, Second sealing strips are arranged between the upper and lower portions of the air inlet panel and the unit mounting beams located in the upper and lower rows, respectively.

4. The high-voltage frequency converter power unit air inlet / outlet face sealing structure according to claim 3, characterized in that, Sides of the upper and lower portions of the air inlet panel facing the unit mounting beams are provided with sunken platforms matched with the unit mounting beams.

5. The high voltage frequency converter power unit air inlet / outlet face seal structure of claim 4, wherein, The second sealing strips are located between the unit mounting beams and side walls of the sunken platforms.

6. A sealing structure for the air inlet and outlet surface of a power unit of a high-voltage frequency converter according to any one of claims 3-5, characterized in that, The second sealing strips are flexible sealing strips.

7. The high voltage frequency converter power unit air inlet / outlet face seal structure of claim 6, wherein, The second sealing strips are EPDM sealing strips made of EPDM material.

8. The high voltage frequency converter power unit air inlet / outlet face seal structure of claim 1, wherein, The unit mounting beams have a cross-section in the shape of a Chinese character "。 9. The high voltage frequency converter power unit air inlet / outlet face seal structure of claim 1, wherein, The first sealing strips are sealing strips made of SMC material.

10. The high voltage frequency converter power unit air inlet / outlet face seal structure of claim 2, wherein, The air inlet panel and the unit mounting beam are detachably connected.

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