Filter device for air inlet of high-voltage frequency converter

Abstract

The utility model belongs to the technical field of high-voltage frequency converters, and particularly discloses a high-voltage frequency converter air inlet filtering device which comprises an outer frame and two filtering layers, a plurality of connecting plates are arranged on one side of the outer frame, a plurality of round through holes are formed in the connecting plates, and two strip-shaped through holes are formed in each of the two sides of the outer frame. The inner sides of the upper frame and the lower frame of the outer frame are each provided with two strip-shaped grooves, the two strip-shaped grooves correspond to the strip-shaped through holes respectively, the outer sides of the upper frame and the lower frame of each filter layer are provided with protruding strips, each protruding strip is in sliding connection with the corresponding strip-shaped groove, filter cotton is placed in each filter layer, and a handle is arranged on each filter layer. The device can clean the filter screen at the air inlet of the high-voltage frequency converter in a non-stop state, can adapt to the fast-paced requirement of steelmaking production, and can timely disassemble, purge and maintain the filter screen at the air inlet under the condition that the high-voltage frequency converter is not stopped, so that the service life of the high-voltage frequency converter is prolonged. And the risk of high-temperature alarm shutdown of the transformer and the power unit caused by blockage of the air inlet is reduced.

Description

Technical Field

[0001] This utility model relates to the field of high voltage frequency converter technology, specifically to a high voltage frequency converter air inlet filter device. Background Technology

[0002] Currently, multiple high-voltage frequency converters are used simultaneously in steelmaking processes. During the operation of these converters, the filter plays a crucial role. It effectively blocks dust, fibers, metal particles, and corrosive substances such as sulfides and chlorides from entering the converter, protecting the complex internal electronic components and circuits. This prevents dust accumulation from affecting heat dissipation, reducing component performance and lifespan, and avoids corrosive substances damaging metal parts and electronic components, thus preventing malfunctions. It also blocks moisture to a certain extent, reducing its adverse effects on components. While fulfilling its blocking function, the filter does not obstruct airflow, ensuring that cooling air smoothly enters the converter to remove heat, providing a relatively clean and dry working environment, maintaining stable operating temperature and performance, reducing equipment failure rates, and extending equipment lifespan.

[0003] However, during long-term filtration operations, the air inlet of the high-voltage frequency converter filter screen can become clogged with impurities such as plant fluff, flying insects, and dust. Therefore, the filter screen needs to be purged at least twice a month. These high-voltage frequency converters use fixed filter screen devices, but since the high-voltage frequency converters are in operation for a long time and there are few opportunities to stop, and it is strictly forbidden to open the cabinet door during normal operation, maintenance cannot be performed at any time. This causes the transformers and power units of each high-voltage frequency converter to experience high temperature alarms and shutdowns due to blocked ventilation openings, thus affecting the overall operating conditions. Utility Model Content

[0004] The purpose of this utility model is to provide a high-voltage frequency converter air inlet filter device to solve the problem that high-voltage frequency converters are in a long-term working state with few opportunities for shutdown. During normal operation, it is strictly forbidden to open the cabinet door and perform maintenance at any time. As a result, the transformers and power units of the high-voltage frequency converters will cause high temperature alarms and shutdowns due to blocked ventilation openings, thus affecting the overall operating conditions.

[0005] To achieve the above objectives, the basic solution provided by this utility model is as follows: a high-voltage frequency converter air inlet filter device, including an outer frame and two filter layers. A plurality of connecting plates are provided on one side of the outer frame, and a plurality of circular through holes are opened on the connecting plates. Two strip-shaped through holes are opened on each side of the outer frame. Two strip-shaped grooves are opened on the inner sides of the upper and lower frames of the outer frame, and the two strip-shaped grooves correspond to the strip-shaped through holes respectively. A protruding strip is provided on the outer side of the upper and lower frames of each filter layer, and each protruding strip is slidably connected to the strip-shaped groove. Filter cotton is placed in each filter layer, and a handle is provided on each filter layer.

[0006] The working principle of this utility model is as follows: the convex strips of the two filter layers are slid into the strip groove of the outer frame in sequence to form two layers of filter. When cleaning, first take out one filter layer and clean the filter cotton inside. Put the cleaned filter cotton into the filter layer, then slide the filter layer into the outer frame. Then take out the other filter layer and repeat the cleaning work.

[0007] The beneficial effects of this utility model are as follows: the device can clean the air inlet filter of the high-voltage frequency converter without shutting down the machine, which can adapt to the needs of the fast pace of steelmaking production. It ensures that the air inlet filter can be disassembled and cleaned in a timely manner without shutting down the high-voltage frequency converter, reducing the risk of transformer and power unit high temperature alarm shutdown caused by air inlet blockage.

[0008] Option 2, a preferred option of the basic design, involves a filter layer consisting of two frames, Frame 1 and Frame 2. Frame 1 and Frame 2 are connected by a hinge on one side. Frame 1 has a latch on its movable side, and Frame 2 has a slot on its movable side. The latch and slot are connected by a snap-fit ​​mechanism. This design, with the filter layer consisting of two hinged frames, facilitates easy cleaning and replacement of the internal filter cotton without requiring strenuous disassembly. Furthermore, it prevents damage to the filter cotton when placing clean filter cotton.

[0009] Option 3, a preferred option of Option 2, features protective netting on both frame 1 and frame 2, with the filter cotton positioned between the two nets. The protective netting protects the filter cotton inside the frame from deformation due to the suction force of the high-voltage inverter during operation.

[0010] Option four, a preferred option of the basic design, involves placing an aluminum gasket within each groove. The aluminum gasket reduces friction between the raised strip and the groove.

[0011] Option 5, the preferred option of the basic solution, features a frame, filter layer, and connecting plate all made of stainless steel. Stainless steel has high strength and is resistant to corrosion and high temperatures, making it not only resistant to the corrosion of the high-voltage frequency converter in harsh environments but also able to withstand the airflow impact at the air inlet and collisions with external objects.

[0012] Option six, an optimal choice from the basic options, uses sponge as the filter material. Sponge offers good filtration and breathability, and has low operating costs. Attached Figure Description

[0013] Figure 1 This is a perspective view of a high-voltage frequency converter air inlet filter device according to the present invention;

[0014] Figure 2 This is a perspective view of the outer frame of the air inlet filter device for a high-voltage frequency converter according to this utility model.

[0015] Figure 3 This is a perspective view of the filter layer of a high-voltage frequency converter air inlet filter device according to this utility model.

[0016] Figure 4 This is a three-dimensional view of the filter layer of a high-voltage frequency converter air inlet filter device when the filter layer is open.

[0017] Figure 5 yes Figure 3 A magnified view of a portion of point A in the middle. Detailed Implementation

[0018] The present invention will be further described in detail below through specific embodiments:

[0019] The reference numerals in the accompanying drawings of the instruction manual include: 1. outer frame, 2. filter layer, 201. frame one, 202. frame two, 203. buckle, 204. slot, 3. connecting plate, 4. circular through hole, 5. strip through hole, 6. strip groove, 7. protrusion, 8. filter cotton, 9. handle, 10. protective net, 11. aluminum gasket.

[0020] Example

[0021] The basic implementation examples are as follows: Figure 1 To be continued Figure 5 As shown: A high-voltage frequency converter air inlet filter device includes an outer frame 1 and two filter layers 2. The filter layers 2 are divided into a first frame 201 and a second frame 202. The first frame 201 and the second frame 202 are connected by a hinge on one side. The movable side of the first frame 201 is provided with a buckle 203, and the movable side of the second frame 202 is provided with a slot 204. The buckle 203 and the slot 204 are connected by a snap-fit. A plurality of connecting plates 3 are provided on one side of the outer frame 1. A plurality of circular through holes 4 are opened on the plurality of connecting plates 3. Two strip-shaped through holes 5 are opened on each side of the outer frame 1. The inner sides of the upper and lower frames of the outer frame 1 are each provided with a... There are two strip-shaped grooves 6, each with an aluminum gasket 11. The strip-shaped grooves 6 correspond to the strip-shaped through holes 5. The outer sides of the upper and lower frames of each filter layer 2 are provided with protruding strips 7, each of which is slidably connected to the strip-shaped grooves 6. Each filter layer 2 contains filter cotton 8. The first frame 201 and the second frame 202 are provided with protective nets 10. The filter cotton 8 is located between the two protective nets 10. The filter cotton 8 is made of sponge. Each filter layer 2 is provided with a handle 9. The outer frame 1, filter layer 2, connecting plate 3 and handle 9 are all made of stainless steel.

[0022] The implementation method of this embodiment is as follows:

[0023] 1. When installing the filter device, first place the filter device at the air inlet, then the connecting plate 3 on the outer frame 1 abuts against the high voltage inverter housing, and the bolts are passed through the circular through hole 4 on the connecting plate 3 to connect the connecting plate 3 with the high voltage inverter housing, thereby fixing the filter device at the air outlet of the high voltage inverter.

[0024] 2. When cleaning the filter device, first pull the handle 9 to remove one filter layer 2 from the outer frame 1, leaving the other filter layer 2 in the outer frame 1 for filtration. Then place the removed filter layer 2 in the cleaning area, flip the buckle 203 to separate the buckle 203 from the slot 204, then open the first frame 201 and take out the filter cotton 8 for cleaning. After cleaning, place the clean filter cotton 8 on the second frame 202, then close the first frame 201, flip the buckle 203 in the opposite direction to lock the buckle 203 and the slot 204, then place the assembled filter layer 2 back into the outer frame 1. Then take out the other filter layer 2 and repeat the cleaning process. Finally, put the cleaned filter layer 2 back into the outer frame 1.

[0025] The above descriptions are merely embodiments of this utility model, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A high-voltage frequency converter air inlet filter device, characterized by, Including outer frame (1) and two filter layer (2), one side of outer frame (1) is equipped with several connecting plate (3), several connecting plate (3) is opened with several circular through hole (4), both sides of outer frame (1) are opened with two strip through hole (5), the inside of upper and lower frame of outer frame (1) is opened with two strip recess (6) respectively, strip recess (6) corresponds with strip through hole (5) respectively, the outside of each filter layer (2) is equipped with convex strip (7), each convex strip (7) is connected with strip recess (6) slidingly, each filter layer (2) is placed with filter cotton (8), each filter layer (2) is equipped with handle (9).

2. The high-voltage frequency converter air inlet filtering device according to claim 1, characterized in that, The filter layer (2) is divided into frame one (201) and frame two (202), one side of the frame one (201) and the frame two (202) is hinged, the movable side of the frame one (201) is equipped with a buckle (203), the movable side of the frame two (202) is equipped with a clamping groove (204), the buckle (203) and the clamping groove (204) are buckled.

3. The high-voltage frequency converter air inlet filter device according to claim 2, characterized in that, The frame one (201) and the frame two (202) are equipped with protective nets (10), and the filter cotton (8) is located between the two protective nets (10).

4. The high-voltage frequency converter air inlet filter device according to claim 1, characterized in that, Each strip recess (6) is equipped with an aluminum gasket (11).

5. The high-voltage frequency converter air inlet filter device according to claim 1, characterized in that, The outer frame (1), filter layer (2), connecting plate (3) and handle (9) are stainless steel materials.

6. The high-voltage frequency converter air inlet filter device according to claim 1, characterized in that, The material of the filter cotton (8) is sponge.

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