A return air filter screen structure

Abstract

The utility model discloses a kind of return air filter screen structures, including the upper frame and lower frame of hollow rectangle, the upper frame and lower frame are enclosed and form a containing space for containing filter cotton, the filter cotton is in wave shape, the upper frame is provided with several lower limit rod corresponding with the wave trough of filter cotton, the lower frame is provided with several upper limit rod corresponding with the wave crest of filter cotton, the upper frame and lower frame are connected by locking member;Filter cotton is fixed as wave shape by upper frame, lower frame, upper limit rod and lower limit rod, filter cotton will filter dust impurities in air, ensure that the air in the compartment is clean, wave-shaped filter cotton can increase filter area, prolong service time, reduce replacement frequency, the connection of locking member is stable, so that filter cotton is not prone to displacement under the action of wind force.

Description

Technical Field

[0001] This utility model relates to the field of rail vehicle equipment technology, specifically to a return air filter structure. Background Technology

[0002] The air conditioning system used on rail vehicles must be able to withstand harsh working environments such as rain, snow, and dust. The filtration mechanism needs to filter rainwater and dust. Since rail vehicles are outdoors for a long time, they are prone to accumulating dust and other impurities and need to be replaced regularly. However, since rail vehicles are in operation most of the time, it is inconvenient to replace and clean them. Therefore, a filtration mechanism that can reduce the frequency of replacement and cleaning and is easy to disassemble and install is needed. Utility Model Content

[0003] Based on the above-mentioned problems existing in the prior art, the purpose of this utility model embodiment is to provide a return air filter structure.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a return air filter structure, including an upper frame and a lower frame that are hollow rectangles, the upper frame and the lower frame enclosing a receiving space for accommodating filter cotton, the filter cotton being wavy, the upper frame being provided with a plurality of lower limit rods corresponding to the troughs of the filter cotton, the lower frame being provided with a plurality of upper limit rods corresponding to the crests of the filter cotton, and the upper frame and the lower frame being connected by a locking member.

[0005] Furthermore, the outer edge of the upper frame is folded downward to form an upper edge strip, and the outer edge of the lower frame is folded upward to form a lower edge strip, with the upper edge strip located on the outer periphery of the lower edge strip.

[0006] Furthermore, a mounting plate is provided on the side of the lower frame opposite to the upper frame, and the horizontal projection surface of the mounting plate completely covers the horizontal projection surface of the lower frame.

[0007] Furthermore, the mounting plate has lock seats located on the outer side of the lower strip on both sides in the width direction. A rotating rod is rotatably mounted on the lock seat, and a bolt is mounted on the rotating rod. Locking plates corresponding to the lock seats are provided on both outer sides in the width direction of the upper frame. The locking plates have grooves for the bolt to rotate on the outer side, and a wing nut is threaded onto the bolt.

[0008] Furthermore, a thickened layer is provided at the edge of the filter cotton.

[0009] Furthermore, a metal filter screen is provided between the upper frame and the filter cotton, and the metal filter screen is wavy.

[0010] Compared with existing technologies, the beneficial effects achieved by this utility model are as follows: the filter cotton is fixed in a wavy shape by the upper frame, lower frame, upper limit rod, and lower limit rod. The filter cotton will filter dust and impurities in the air, ensuring clean air inside the carriage. The wavy shape of the filter cotton can increase the filtration area, extend the service life, and reduce the replacement frequency. The connection of the locking parts is stable, making the filter cotton less likely to shift under the action of wind. It is also easy to disassemble, facilitating maintenance or replacement of components. Attached Figure Description

[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0012] In the picture: Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is an exploded view of the present invention; Figure 3 yes Figure 1 Enlarged diagram of point A in the diagram; In the picture: 1. Upper frame; 11. Upper edge strip; 12. Upper limit rod; 13. Locking plate; 14. Groove; 2. Lower frame; 21. Lower edge strip; 22. Lower limit rod; 3. Filter cotton; 4. Mounting plate; 41. Mounting hole; 42. Lock seat; 43. Rotating rod; 44. Bolt; 45. Wing nut. Detailed Implementation

[0013] The present invention will now be described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0014] Please see Figure 1-3 The present invention provides a technical solution: a return air filter structure, including an upper frame 1 and a lower frame 2 in the form of a hollow rectangle, the upper frame 1 and the lower frame 2 enclosing a receiving space for accommodating filter cotton 3, the filter cotton 3 being wavy, the upper frame 1 being provided with a plurality of lower limit rods 22 corresponding to the troughs of the filter cotton 3, the lower frame 2 being provided with a plurality of upper limit rods 12 corresponding to the crests of the filter cotton 3, and the upper frame 1 and the lower frame 2 being connected by a locking member; The filter cotton 3 is fixed by the upper frame 1 and the lower frame 2. The filter cotton 3 will filter dust and impurities in the air to ensure clean air in the compartment. The filter cotton 3 is further fixed by the upper limit rod 12 and the lower limit rod 22. The filter cotton 3 can be wavy or flat. It is limited by the upper limit rod 12 and the lower limit rod 22 to make it wavy and fixed. The wavy filter cotton 3 can increase the filtration area, extend the service life, reduce the replacement frequency, and the connection of the locking parts is stable. The compression of the filter cotton 3 by the upper frame 1 and the lower frame 2 makes the filter cotton 3 less likely to be displaced under the action of wind.

[0015] The outer edge of the upper frame 1 is folded down to form the upper edge strip 11, and the outer edge of the lower frame 2 is folded up to form the lower edge strip 21. The upper edge strip 11 is located on the outer periphery of the lower edge strip 21. A thickened layer is provided at the edge of the filter cotton 3 (not shown in the figure). The width of the upper strip 11 is the same as the width of the lower strip 21. When the upper frame 1 and the lower frame 2 are assembled, the upper strip 11 is attached to the lower strip 21, the lower strip 21 is attached to the upper frame 1, and the upper strip 11 is attached to the lower frame 2. This can effectively prevent rainwater from leaking from the edge gaps, while limiting the compression range of the filter cotton 3. The thickened layer increases the structural strength and prevents it from being damaged by the filter compression.

[0016] A mounting plate 4 is provided on the side of the lower frame 2 away from the upper frame 1. The horizontal projection surface of the mounting plate 4 completely covers the horizontal projection surface of the lower frame 2. Lock seats 42 located outside the lower edge strip 21 are provided on both sides of the mounting plate 4 in the width direction. A rotating rod 43 is rotatably provided on the lock seat 42. A bolt 44 is provided on the rotating rod 43. Locking plates 13 corresponding to the lock seats 42 are provided on both outer sides in the width direction of the upper frame 1. The locking plates 13 have a groove 14 for the bolt 44 to rotate on the outer side. A wing nut 45 is threaded on the bolt 44. Mounting plate 4 has mounting holes 41 for connecting to the carriage and fitting snugly against the carriage wall to maintain a seal. When replacing or repairing the upper frame 1, lower frame 2, filter cotton 3, etc., there is no need to disassemble mounting plate 4. Reducing the number of times mounting plate 4 is installed and disassembled can effectively prevent gaps from forming between mounting plate 4 and carriage wall. During installation, after assembling the upper frame 1 and lower frame 2, place them on mounting plate 4, align lock seat 42 with lock plate 13, and rotate bolt 44 into groove 14 and lock it with wing nut 45 for fixation. Wing nut 45 has ears, which can increase the lever arm for easy manual tightening and disassembly.

[0017] A metal filter screen (not shown in the figure) is provided between the upper frame 1 and the filter cotton 3. The metal filter screen is wavy. Larger impurities are blocked by the metal filter screen, preventing the filter cotton 3 from becoming clogged in a short time and extending its effective service life. The wavy shape of the metal filter screen allows it to better adhere to the filter cotton 3 and restricts the shape of the filter cotton 3, preventing it from deforming.

[0018] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the scope of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A return air filter structure, characterized in that: It includes a hollow rectangular upper frame and a lower frame, which enclose a receiving space for accommodating filter cotton. The filter cotton is wavy. The upper frame is provided with several lower limit rods corresponding to the troughs of the filter cotton, and the lower frame is provided with several upper limit rods corresponding to the crests of the filter cotton. The upper frame and the lower frame are connected by a locking device.

2. The return air filter structure according to claim 1, characterized in that: The outer edge of the upper frame is folded down to form an upper edge strip, and the outer edge of the lower frame is folded up to form a lower edge strip. The upper edge strip is located on the outer periphery of the lower edge strip.

3. The return air filter structure according to claim 1, characterized in that: A mounting plate is provided on the side of the lower frame away from the upper frame, and the horizontal projection surface of the mounting plate completely covers the horizontal projection surface of the lower frame.

4. The return air filter structure according to claim 3, characterized in that: Lock seats are provided on both sides of the mounting plate in the width direction, located on the outer side of the lower strip. A rotating rod is rotatably mounted on the lock seat, and a bolt is mounted on the rotating rod. Locking plates corresponding to the lock seats are provided on both outer sides of the upper frame in the width direction. The locking plates have grooves on the outer side for the bolt to rotate, and a wing nut is threaded onto the bolt.

5. The return air filter structure according to claim 1, characterized in that: The filter cotton has a thickened layer at its edge.

6. The return air filter structure according to claim 3, characterized in that: A metal filter screen is provided between the upper frame and the filter cotton, and the metal filter screen is wavy.

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