Supporting frame for centrifugal fan, centrifugal fan assembly and frequency converter

Abstract

The utility model relates to a supporting frame used for a centrifugal fan, a centrifugal fan assembly and a frequency converter. The supporting frame (100) comprises a bottom plate (110), a supporting frame (120) and a supporting frame (120), a plurality of support columns (120), wherein the bottom of each of the plurality of support columns is fixed on the bottom plate; the cover plate (130) is fixed to the top of each supporting column; wherein the top of each supporting column (120) is closer to the vertical center line of the bottom plate (110) than the bottom of each supporting column (120), so that the technical effects that the supporting frame for the centrifugal fan has high stability, can be matched with fans of different specifications for use, and has lower cost are achieved.

Description

Technical Field

[0001] The present application relates to a support frame for a centrifugal fan, and more specifically, to an improved support frame for a centrifugal fan which can provide high stability, is suitable for use with fans of different specifications, and is low in cost, a centrifugal fan assembly including the support frame, and a frequency converter including the centrifugal fan assembly. Background Art

[0002] In applications such as ships, centrifugal fans are often faced with extremely harsh vibration conditions, which places extremely high strength and stability requirements on the fan support frame. However, the rigidity of the traditional centrifugal fan support frame is insufficient, resulting in the fan response point acceleration value being too high in extremely harsh vibration conditions such as ships, and unable to meet the necessary safety standards.

[0003] Currently, one solution is to use a welded structure with high strength (such as high-strength steel) and complex design (such as mesh connection) as the main frame of the fan support structure. This structure can effectively resist vibration and protect the normal operation of the fan, but it is expensive and difficult to apply to fans of different specifications. Another solution is to add special dampers at the bottom of the fan support frame to absorb and reduce vibration transmission, helping the fan to maintain stable operation under extreme conditions. However, these special dampers are expensive.

[0004] Therefore, it is desirable to provide an improved support frame for a centrifugal fan, which can effectively withstand harsh vibration conditions such as ships, provide high stability, and can be adapted for use with fans of different specifications and has a lower cost. Utility Model Content

[0005] The present application is proposed in view of the above-mentioned problems. The main purpose of the present application is to provide an improved support frame for a centrifugal fan, a centrifugal fan assembly including the support frame, and a frequency converter including the centrifugal fan assembly, so as to at least solve the technical problems in the prior art that the support frame for the centrifugal fan is difficult to withstand the harsh vibration conditions of ships, etc., is costly and cannot be adapted to fans of different specifications.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a support frame for a centrifugal fan is provided, which includes: a base plate; a plurality of support columns, the bottom of each of the plurality of support columns is fixed on the base plate; and a cover plate, fixed to the top of each support column; wherein the top of each support column is closer to the vertical center line of the base plate than the bottom.

[0007] In this way, the support frame formed by the base plate, multiple support columns and the cover plate can be in the shape of a prism (or a truncated pyramid), which makes it more stable than the traditional rectangular support frame, thereby enabling it to be used in harsh vibration conditions such as ships.

[0008] Further, according to an embodiment of the present application, an adapter plate and a shock-absorbing pad are arranged between the top of each support column and the cover plate, and the top of each support column, the adapter plate, the shock-absorbing pad and the cover plate are connected in sequence by a first bolt.

[0009] In this way, by arranging the adapter plate and the shock-absorbing pad between each support column and the cover plate, the damping coefficient of the support frame can be increased, and the influence of vibration on the structure of the support frame can be reduced. In addition, since the first bolt connection is used, it is easy to replace the shock-absorbing pad and the adapter plate for centrifugal fans of different weights. Therefore, the support frame for centrifugal fans according to the present application can be applicable to centrifugal fans of different weights.

[0010] Further, according to an embodiment of the present application, the bottom of each support column is fixed to the base plate by a second bolt.

[0011] In this way, each component in the support frame of the present application is fixed by bolts, so each component is detachable. In this way, for centrifugal fans of different specifications (such as height or weight), only local components need to be replaced to adapt the centrifugal fan. That is, the support frame of the present application adopts a modular design, which greatly reduces the design time and difficulty, and makes it highly versatile. In particular, since the support column is detachable, different support columns with height matching can be selected for centrifugal fans of different heights. Therefore, the support frame for centrifugal fans according to the present application can be suitable for centrifugal fans of different heights.

[0012] Further, according to an embodiment of the present application, the shock absorbing pad includes at least one cylindrical shock absorbing pad.

[0013] Further, according to an embodiment of the present application, the shock-absorbing pad includes a plurality of cylindrical shock-absorbing pads, and the plurality of cylindrical shock-absorbing pads are arranged side by side on the adapter plate along the length direction of the adapter plate.

[0014] In this way, multiple shock-absorbing pads can be used to effectively increase the damping coefficient of the support frame and reduce the impact of vibration on the structure of the support frame.

[0015] Further, according to an embodiment of the present application, each support column includes a top plate, a bottom plate opposite to the top plate, a back plate connecting the top plate and the bottom plate, and two opposite side plates located on both sides of the back plate. The top plate, the bottom plate, the back plate, and the two side plates form a groove-like structure, and the opening of the groove-like structure faces the center of the bottom plate. The top of the support column includes the top plate, and the bottom of the support column includes the bottom plate.

[0016] In this way, the support columns are arranged in a slot-like structure with an opening, which makes it easy for operators to operate the connecting bolts on each support column, thereby facilitating the replacement of various components in the support frame.

[0017] Further, according to an embodiment of the present application, the cover plate is provided with an opening that matches the size and shape of the top portion of the centrifugal fan, and the bottom plate is provided with an opening that matches the size and shape of the bottom portion of the centrifugal fan.

[0018] In this way, the centrifugal fan can be fixed in the supporting frame.

[0019] According to another aspect of the present application, a centrifugal fan assembly is provided, comprising: the above-mentioned support frame for a centrifugal fan; and a centrifugal fan, comprising a top portion, a middle portion and a bottom portion. The bottom portion of the centrifugal fan is arranged in an opening of a bottom plate of the support frame, the top portion of the centrifugal fan is exposed through an opening on a cover plate of the support frame, and the cover plate of the support frame is fixed to the middle portion of the centrifugal fan by a third bolt.

[0020] In this way, the centrifugal fan can be stably mounted in the support frame, and the support frame can stably support the centrifugal fan even under severe vibration conditions such as ships. Therefore, the centrifugal fan assembly can be suitable for severe vibration conditions such as ships.

[0021] Further, according to an embodiment of the present application, the bottom portion of the centrifugal fan is provided with an opening facing downward of the base plate.

[0022] In this way, the opening can serve as an air inlet for the centrifugal fan.

[0023] According to another aspect of the present application, a frequency converter is provided, which includes: a cabinet, and the above-mentioned centrifugal fan assembly, wherein the centrifugal fan assembly is arranged in the cabinet and fixed to at least one of the top surface, bottom surface and side surface of the cabinet.

[0024] In this way, by using the centrifugal fan assembly with the above-mentioned support frame in the frequency converter, the centrifugal fan assembly can be suitable for severe vibration conditions such as ships, so that the frequency converter can also be suitable for severe vibration conditions such as ships.

[0025] In an embodiment of the present application, a support frame for a centrifugal fan is provided, which includes: a base plate; a plurality of support columns, the bottom of each of the plurality of support columns being fixed on the base plate; and a cover plate fixed to the top of each support column; wherein the top of each support column is closer to the vertical center line of the base plate than the bottom, thereby achieving the technical effect of providing a support frame for a centrifugal fan that has high stability, can be adapted to fans of different specifications, and has low cost, a centrifugal fan assembly including the support frame, and a frequency converter including the centrifugal fan assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings constituting part of the present application are used to provide a further understanding of the present application. The exemplary embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0027] Figure 1 A structural schematic diagram of a support frame for a centrifugal fan according to an exemplary embodiment of the present application is shown;

[0028] Figure 2 A detailed schematic diagram of an adapter plate and a shock-absorbing pad in a support frame for a centrifugal fan according to an exemplary embodiment of the present application is shown;

[0029] Figure 3 A detailed schematic diagram of a support column in a support frame for a centrifugal fan according to an exemplary embodiment of the present application is shown;

[0030] Figure 4 A schematic diagram showing a centrifugal fan assembly including a support frame for a centrifugal fan according to an exemplary embodiment of the present application; and

[0031] Figure 5 A schematic diagram of a frequency converter according to an exemplary embodiment of the present application is shown.

[0032] The above drawings include the following reference numerals:

[0033] 100: Support frame

[0034] 110: Base plate

[0035] 111: Opening

[0036] 120: Support column

[0037] 121: Top plate

[0038] 122: Bottom plate

[0039] 123: Back panel

[0040] 124, 125: Side panels

[0041] 130: Cover

[0042] 131: Opening

[0043] 140: Adapter plate

[0044] 150: Shock pad

[0045] 160: First Bolt

[0046] 170: Second bolt

[0047] 180: Third bolt

[0048] 200: Centrifugal fan

[0049] 210: Top section

[0050] 220: Middle part

[0051] 230: Bottom section

[0052] 400: Centrifugal fan assembly

[0053] 500: Inverter

[0054] 510: Cabinet

[0055] 512, 514: Partition

[0056] 520: Heat exchanger

[0057] 530: Power unit DETAILED DESCRIPTION

[0058] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0059] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0060] In the present application, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present application.

[0061] The purpose of the present application is to provide an improved support frame for centrifugal fans, so as to at least solve the technical problems in the prior art that the support frame for centrifugal fans is difficult to withstand harsh vibration conditions such as ships, is costly and cannot be adapted to fans of different specifications.

[0062] In the present application, a support frame for a centrifugal fan refers to a structural component used to support and fix a centrifugal fan, which ensures that the centrifugal fan remains stable during operation, reduces the vibration of the centrifugal fan, and provides necessary mechanical support to the centrifugal fan.

[0063] Figure 1 FIG. 2 shows a schematic structural diagram of a support frame for a centrifugal fan according to an exemplary embodiment of the present application. Figure 1 As shown, the support frame 100 for the centrifugal fan includes: a bottom plate 110; a plurality of support columns 120, the bottom of each support column 120 being fixed on the bottom plate 110; and a cover plate 130, fixed to the top of each support column 120; wherein the top of each support column 120 is closer to the vertical center line of the bottom plate 110 than the bottom. The vertical center line of the bottom plate 110 is a straight line passing through the center of the bottom plate and perpendicular to the plane where the bottom plate is located.

[0064] In other words, when moving from the bottom to the top along the support column 120, it gradually approaches the vertical center line of the bottom plate 110. Thus, the support frame 100 formed by the bottom plate 110, the plurality of support columns 120 and the cover plate 130 can be in a prism shape, for example, a triangular prism shape, a quadrangular prism shape, a pentagonal prism shape, etc.

[0065] In this way, compared with a conventional rectangular support frame (ie, a frame in which the support columns are perpendicular to the bottom plate), the overall stability of the support frame 100 can be improved, thereby enabling it to be applied to harsh vibration conditions such as ships.

[0066] Preferably, the support frame 100 may be in a quadrangular pyramid shape. In this case, the number of the support columns 120 is four. In the case of a quadrangular pyramid shape, high stability can be achieved while minimizing the influence of the support frame 100 on the air volume provided by the centrifugal fan. Figure 1 The shape of the support frame 100 is shown by taking a quadrangular pyramid as an example, but it should be noted that the present application is not limited thereto. As long as the bottom plate 110 is set to a triangle, a pentagon, a hexagon or other polygons, and a corresponding number of support columns are set, the support frame 100 can have a triangular pyramid shape, a quadrangular pyramid shape, a pentagonal pyramid shape, and other polygonal pyramid shapes.

[0067] In addition, in the present application, the base plate 110, the plurality of support columns 120 and the cover plate 130 are all made of cold-rolled steel plates (eg, Q235 cold-rolled steel plates), so the material cost is low.

[0068] Further, in the present application, an adapter plate 140 and a shock-absorbing pad 150 are disposed between the top of each support column 120 and the cover plate 130 . The shock-absorbing pad 150 is located on the adapter plate 140 . Figure 2 A detailed schematic diagram of an adapter plate 140 and a shock-absorbing pad 150 in a support frame 100 for a centrifugal fan according to an exemplary embodiment of the present application is shown.

[0069] refer to Figure 1 and Figure 2 In the exemplary embodiment of the present application, the top of each support column 120, the adapter plate 140, the shock absorbing pad 150 and the cover plate 130 are sequentially connected by the first bolt 160. Specifically, the top of each support column 120, the adapter plate 140, the shock absorbing pad 150 and the cover plate 130 are provided with an opening for the first bolt 160 to pass through. The first bolt 160 passes through the top of the support column 120, the adapter plate 140, the shock absorbing pad 150 and the opening on the cover plate 130 in sequence, and is fixed above the cover plate 130 and below the top of the support column 120 via a nut.

[0070] In this way, by providing the adapter plate 140 and the shock-absorbing pad 150 between each support column 120 and the cover plate 130, the damping coefficient of the support frame 100 can be increased and the influence of vibration on the structure of the support frame 100 can be reduced. Therefore, the stability of the support frame 100 can be improved without increasing the cost.

[0071] In addition, since the top of each support column 120, the adapter plate 140, the shock-absorbing pad 150 and the cover plate 130 are connected in sequence by the first bolt 160, these components are detachable. Therefore, it is easy to replace the shock-absorbing pad 150 and the adapter plate 140 adapted thereto. This makes it possible to select shock-absorbing pads of different specifications for centrifugal fans of different weights. For example, a larger shock-absorbing pad 150 can be selected for a heavier centrifugal fan. Therefore, the support frame 100 for a centrifugal fan according to the present application can be applicable to centrifugal fans of different weights.

[0072] The adapter plate 140 may have a rectangular shape, such as a rounded rectangle. The size of the adapter plate 140 may be larger than the size of the top of the support column 120. The size of the adapter plate 140 may also be larger than the size of the shock-absorbing pad 150, so as to stably support the shock-absorbing pad 150 located thereon. In other words, the size of the adapter plate 140 is determined according to the size of the shock-absorbing pad 150. Therefore, different specifications of shock-absorbing pads 150 and their corresponding adapter plates 140 can be selected for centrifugal fans of different weights.

[0073] Further, in the present application, the number of the shock absorbing pads 150 may be one or more. The number of the first bolts 160 is the same as the number of the shock absorbing pads 150. The shock absorbing pads 150 may be cylindrical, rectangular or other suitable shapes. The shock absorbing pads 150 may be made of rubber.

[0074] For example, the shock absorbing pad 150 may include a plurality of cylindrical shock absorbing pads. At this time, on the top of each supporting column 120, a plurality of cylindrical shock absorbing pads are arranged side by side on the adapter plate 140 along the length direction of the adapter plate 140. Figure 1 and Figure 2 The case where two shock-absorbing pads 150 are arranged side by side on the adapter plate 140 is shown, but the present application is not limited thereto.

[0075] Further, in the present application, the bottom of each support column 120 is fixed to the bottom plate 110 by a second bolt 170 .

[0076] In this way, unlike the one-piece support frame of the traditional welding method, the base plate 110, the support column 120 and the cover plate 130 in the support frame 100 of the present application are fixed to each other by bolts, so each component is detachable. In this way, for centrifugal fans of different specifications, only local components need to be replaced to adapt the centrifugal fan. That is, the support frame 100 of the present application adopts a modular design, which greatly reduces the design time and difficulty, and makes it highly versatile. In particular, since the support column 120 is detachable, different support columns 120 with high matching can be selected for centrifugal fans of different heights. Therefore, the support frame 100 for centrifugal fans according to the present application can also be applicable to centrifugal fans of different heights.

[0077] In addition, since all parts are connected by bolts, the processing technology requirements are low and the assembly is convenient.

[0078] Figure 3 FIG. 1 shows a detailed schematic diagram of a support column 120 in a support frame 100 for a centrifugal fan according to an exemplary embodiment of the present application. Figure 3 As shown, each support column 120 includes a top plate 121, a bottom plate 122 opposite to the top plate, a back plate 123 connecting the top plate and the bottom plate, and two opposite side plates 124 and 125 located on both sides of the back plate. The top plate 121, the bottom plate 122, the back plate 123, and the two side plates 124 and 125 form a groove structure. The opening of the groove structure faces the center of the bottom plate 110.

[0079] Further, the top of the support column 120 includes a top plate 121, and the bottom of the support column 120 includes a bottom plate 122. For example, the top of the support column 120 is composed of the top plate 121, and the bottom of the support column 120 is composed of the bottom plate 122. At this time, the top plate 121 of the support column 120, the adapter plate 140, the shock absorbing pad 150 and the cover plate 130 are sequentially connected by the first bolt 160, and the bottom plate 122 of the support column 120 is fixed to the bottom plate 110 by the second bolt 170.

[0080] By arranging the support column 120 into a groove-like structure and making its opening face toward the center of the base plate, it is easy for operators to operate components such as the first bolt 160 and the second bolt 170 on each support column 120, thereby facilitating replacement of components such as the support column 120, the adapter plate 140, and the shock-absorbing pad 150.

[0081] Furthermore, the bottom plate 110 is provided with an opening 111 that matches the size and shape of the bottom portion of the centrifugal fan. Figure 1 As shown, the cover plate 130 is also provided with an opening 131 that matches the size and shape of the top portion of the centrifugal fan. Thus, the centrifugal fan can be installed in the support frame 100.

[0082] Figure 4 FIG. 4 is a schematic diagram showing a centrifugal fan assembly 400 including a support frame for a centrifugal fan according to an exemplary embodiment of the present application. Figure 4 As shown, the centrifugal fan assembly 400 includes a support frame 100 for a centrifugal fan according to the present application and a centrifugal fan 200. The centrifugal fan 200 includes a top portion 210, a middle portion 220, and a bottom portion 230. The bottom portion 230 of the centrifugal fan 200 is arranged in the opening 111 of the bottom plate 110 of the support frame 100, and the top portion 210 of the centrifugal fan 200 is exposed through the opening 131 on the cover plate 130 of the support frame 100.

[0083] In addition, the cover plate 130 of the support frame 100 may be further fixed to the middle portion 220 of the centrifugal fan 200 by the third bolts 180. Thus, the centrifugal fan 200 may be stably installed in the support frame 100.

[0084] In this way, in the centrifugal fan assembly 400 according to the present application, the support frame 100 can stably support the centrifugal fan 200 even under severe vibration conditions such as ships. Therefore, the centrifugal fan assembly 400 according to the present application can be applied to severe vibration conditions such as ships.

[0085] Furthermore, the bottom plate 110 or the cover plate 130 of the support frame 100 may also be fixed to any installation plane (eg, an installation surface in a cabinet of a frequency converter on a ship) via bolts.

[0086] Further, the centrifugal fan 200 may also include a motor, which may be arranged in the housing of the top portion 210. The bottom portion 230 may be provided with an opening (not shown) facing below the bottom plate 110 of the support frame 100, which may serve as an air inlet of the centrifugal fan 200. The middle portion 220 is also provided with a plurality of openings facing all around, and one or more of the plurality of openings may serve as an air outlet of the centrifugal fan 200.

[0087] Figure 5 FIG. 2 shows a schematic diagram of a frequency converter according to an exemplary embodiment of the present application. Figure 5 As shown, the frequency converter 500 includes a cabinet 510 and the centrifugal fan assembly 400. The centrifugal fan assembly 400 is arranged in the cabinet 510 and fixed to at least one of the top surface, the bottom surface and the side surface of the cabinet 510. Thus, the centrifugal fan assembly 400 can force the air in the cabinet 510 to flow. Figure 5 As an example, the centrifugal fan assembly 400 is fixed to the top and side of the cabinet 510, but the present application is not limited thereto. The centrifugal fan assembly 400 can also be fixed only to the top, only to the side, or to the bottom of the cabinet 510.

[0088] Further, the cabinet 510 may be provided with intersecting partitions 512 and 514 for forming an air duct of the centrifugal fan assembly 400. The partition 512 extends along the width direction of the cabinet and is fixed to both sides of the cabinet, and the partition 514 extends vertically from the top surface of the cabinet 510 and is at a predetermined distance from the bottom surface of the cabinet 510. The bottom of the centrifugal fan assembly 400 (for example, the bottom plate 110 of the support frame 100) can be fixed on the partition 512. An opening (for example, a circular opening) corresponding to the air inlet of the centrifugal fan 200 may be provided on the partition 512. One side of the centrifugal fan assembly 400 may be fixed to the partition 514. An opening (for example, a rectangular opening) corresponding to the air outlet of the centrifugal fan 200 may be provided on the partition 514. Thus, the centrifugal fan assembly 400 can take in air from the bottom and discharge air from the side.

[0089] Further, the centrifugal fan assembly 400 can be used as a part of the heat dissipation system of the frequency converter 500. The heat dissipation system can also include a heat exchanger 520 located in the cabinet 510. The heat exchanger 520 can be embedded in the partition 512 and located on both sides of the partition 514 with the centrifugal fan assembly 400. The heat exchanger 520 can reduce the temperature of the air passing therethrough.

[0090] In addition, the frequency converter 500 may further include various power units 530 arranged in the cabinet 510, such as a rectifier unit, a DC intermediate circuit, an inverter unit, etc.

[0091] The air outlet of the centrifugal fan assembly 400 can be connected to the air inlet of the heat exchanger 520 (for example, via a pipe or without a pipe and only having an air flow channel), and together with the heat exchanger 520, achieve efficient heat dissipation of the heat source (i.e., the power unit 530, etc.) in the cabinet 510. Figure 5 The arrows in the figure schematically show the flow path of the air in the cabinet 510. That is, the hot air from the power unit 530 can first enter the centrifugal fan assembly 400, and then the air exhausted from the centrifugal fan assembly 400 can enter the heat exchanger 520, and the cold air after passing through the heat exchanger 520 enters the power unit 530 again. In this way, the heat dissipation of the power unit 530 is achieved. In addition, the air outlet of the heat exchanger 520 can also be connected to the air inlet of the centrifugal fan assembly 400. At this time, the hot air from the power unit 530 enters the centrifugal fan assembly 400 after being cooled by the heat exchanger 520.

[0092] In addition, the frequency converter according to the exemplary embodiment of the present application may be a medium voltage or high voltage frequency converter. In the present application, the medium voltage or high voltage frequency converter refers to a frequency converter with an input voltage of 3.3 kilovolts or more. In the exemplary embodiment of the present application, the input voltage of the medium voltage or high voltage frequency converter may be 10 kilovolts to 13 kilovolts, 35 kilovolts, etc.

[0093] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0094] It should be noted that the terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the application described herein can be implemented in an order other than those illustrated or described herein. The nouns and pronouns related to people in this patent application are not limited to specific genders.

[0095] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A support frame for a centrifugal fan, characterized in that: include: Bottom plate (110); a plurality of support columns (120), wherein the bottom of each support column (120) of the plurality of support columns (120) is fixed on the bottom plate (110); and A cover plate (130) fixed to the top of each of the support columns (120); The top of each support column (120) is closer to the vertical center line of the base plate (110) than the bottom.

2. The support frame for a centrifugal fan according to claim 1, characterized in that: An adapter plate (140) and a shock-absorbing pad (150) are provided between the top of each support column (120) and the cover plate (130); the top of each support column (120), the adapter plate (140), the shock-absorbing pad (150) and the cover plate (130) are connected in sequence via a first bolt (160).

3. The support frame for a centrifugal fan according to claim 2, characterized in that: The bottom of each support column (120) is fixed to the base plate (110) by a second bolt (170).

4. The support frame for a centrifugal fan according to claim 2, characterized in that: The shock absorbing pad (150) includes at least one cylindrical shock absorbing pad.

5. The support frame for a centrifugal fan according to claim 4, characterized in that: The shock absorbing pad (150) comprises a plurality of cylindrical shock absorbing pads, and the plurality of cylindrical shock absorbing pads are arranged side by side on the adapter plate (140) along the length direction of the adapter plate (140).

6. The support frame for a centrifugal fan according to any one of claims 1 to 5, characterized in that: Each of the support columns (120) comprises a top plate (121), a bottom plate (122) opposite to the top plate (121), a back plate (123) connecting the top plate (121) and the bottom plate (122), and two opposite side plates (124, 125) located on both sides of the back plate (123). The top plate (121), the bottom plate (122), the back plate (123), and the two side plates (124, 125) form a groove-like structure, and the opening of the groove-like structure faces the center of the bottom plate (110). The top of the support column (120) includes the top plate (121), and the bottom of the support column (120) includes the bottom plate (122).

7. The support frame for a centrifugal fan according to any one of claims 1 to 5, characterized in that: The cover plate (130) is provided with an opening whose size and shape match those of the top portion (210) of the centrifugal fan (200), and the bottom plate (110) is provided with an opening whose size and shape match those of the bottom portion (230) of the centrifugal fan (200).

8. A centrifugal fan assembly, characterized in that: include: A support frame for a centrifugal fan according to any one of claims 1 to 7, and The centrifugal fan (200) comprises a top portion (210), a middle portion (220) and a bottom portion (230), The bottom portion (230) of the centrifugal fan (200) is arranged in an opening (111) of a bottom plate (110) of the support frame (100), the top portion (210) of the centrifugal fan (200) is exposed through an opening (131) on a cover plate (130) of the support frame (100), and the cover plate (130) of the support frame (100) is fixed to the middle portion (220) of the centrifugal fan (200) by a third bolt (180).

9. The centrifugal fan assembly according to claim 8, characterized in that: The bottom portion (230) of the centrifugal fan (200) is provided with an opening facing downward of the bottom plate (110).

10. A frequency converter, characterized in that: include: Cabinet (510); as well as The centrifugal fan assembly according to claim 8 or 9, The centrifugal fan assembly (400) is arranged in the cabinet (510) and fixed to at least one of the top surface, the bottom surface and the side surface of the cabinet (510).

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