A prefilter

Abstract

The utility model discloses a prefilter, including filter filter core, filter filter core includes upper end cover and lower end cover, and is equipped with inner net frame and outer net frame between lower end cover with upper end cover, and is equipped with single layer filter core as leaning on the upper arrangement, double layer filter core as leaning on the lower arrangement between outer net frame with inner net frame, is equipped with air inlet on the upper end cover, and the inner net frame is slidably connected with the reversing valve core of moving along the axial direction, and the reversing valve core includes upper baffle and lower baffle, and is connected with the support rib between lower baffle with upper baffle, and is connected with the air intake pipe of protruding air inlet on upper baffle, and is equipped with axial positioning assembly between reversing valve core and inner net frame. This prefilter has two filterings, and the characteristic that gear position can switch, and the overall function is perfect, and the practicality is strong.

Description

Technical Field

[0001] This utility model relates to the field of filtration equipment technology, and more specifically, to a pre-filter. Background Technology

[0002] Pre-filters typically only have one filtration mode, requiring replacement of the filter cartridge when filtering air of varying turbidity. However, if the pre-filter is equipped with a two-stage filter cartridge that allows for switching between stages, this problem is avoided. Therefore, this invention proposes a pre-filter. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a pre-filter with two-stage filtration and switchable stages.

[0004] To solve the above-mentioned technical problems, the purpose of this utility model is achieved as follows: This utility model relates to a pre-filter, comprising a filter element, the filter element including an upper end cover and a lower end cover, an inner mesh frame and an outer mesh frame provided between the lower end cover and the upper end cover, a single-layer filter element arranged upwards and a double-layer filter element arranged downwards provided between the outer mesh frame and the inner mesh frame, an air inlet provided on the upper end cover, and a reversing valve core slidably connected within the inner mesh frame, the reversing valve core including an upper baffle plate and a lower baffle plate, a supporting rib connected between the lower baffle plate and the upper baffle plate, and an air inlet pipe extending out of the air inlet connected to the upper baffle plate.

[0005] The present invention is further configured such that an axial positioning component is provided between the reversing valve core and the inner mesh frame.

[0006] The present invention is further configured such that: the axial positioning component includes a positioning side panel disposed on the upper or lower wind deflector, the positioning side panel is provided with spring plate holes around the perimeter, the spring plate holes are provided with positioning spring plates connected to the positioning side panel, the positioning spring plates are provided with positioning protrusions, and the inner mesh frame is provided with upper positioning holes and lower positioning holes that match the positioning protrusions.

[0007] When the positioning protrusion is embedded in the upper positioning hole, the reversing valve core matches the single-layer filter core for filtration; when the positioning protrusion is embedded in the lower positioning hole, the reversing valve core matches the double-layer filter core for filtration.

[0008] The present invention is further configured such that: the inner mesh frame is provided with a circumferential limiting hole extending along the axial direction, and a circumferential limiting block is slidably connected in the circumferential limiting hole, and the circumferential limiting block is provided on the positioning side wall.

[0009] The present invention is further configured such that the supporting rib is distributed between the upper wind deflector and the lower wind deflector.

[0010] In summary, the present invention has the following beneficial effects: the pre-filter involved in the present invention can realize two-level switching filtration function, manual switching is flexible and convenient, the failure rate is low, the compatibility is strong, the overall function is complete, and the practicality is strong. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0012] Figure 2 This is a partial structural schematic diagram of the present invention. Detailed Implementation

[0013] To enable those skilled in the art to better understand the technical solution of this utility model, the preferred embodiments of this utility model are described below in conjunction with specific examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of this utility model, and not for limiting the patent claims of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this utility model.

[0014] The present invention will be further described below with reference to the accompanying drawings and preferred embodiments.

[0015] Example 1

[0016] See Figure 1 and Figure 2 As shown, the pre-filter involved in this embodiment includes a filter element, which includes an upper end cover 1 and a lower end cover 2. An inner mesh frame 3 and an outer mesh frame 4 are provided between the lower end cover 2 and the upper end cover 1. A single-layer filter element 5 arranged at the top and a double-layer filter element 6 arranged at the bottom are provided between the outer mesh frame 4 and the inner mesh frame 3. An air inlet 7 is provided on the upper end cover 1. A reversing valve core 100 that moves axially is slidably connected in the inner mesh frame 3. The reversing valve core 100 includes an upper baffle plate 8 and a lower baffle plate 9. A support rib 10 is connected between the lower baffle plate 9 and the upper baffle plate 8. An air inlet pipe 11 extending out of the air inlet is connected to the upper baffle plate 8.

[0017] Furthermore, an axial positioning assembly is provided between the reversing valve core 100 and the inner mesh frame 3; the axial positioning assembly includes a positioning side circumference 12 provided on the lower wind deflector plate, the positioning side circumference 12 is provided with spring plate holes, the spring plate holes are provided with positioning spring plates 13 connected to the positioning side circumference, the positioning spring plates 13 are provided with positioning protrusions 14, and the inner mesh frame 3 is provided with upper positioning holes 15 and lower positioning holes 16 that match the positioning protrusions;

[0018] When the positioning protrusion is embedded in the upper positioning hole, the reversing valve core matches the single-layer filter core for filtration; when the positioning protrusion is embedded in the lower positioning hole, the reversing valve core matches the double-layer filter core for filtration.

[0019] In this embodiment, the air inlet pipe 11 is used to connect to the air source. By axially moving the reversing valve core 100, the turbid air flowing out of the reversing valve core 100 can be filtered by filter elements at different settings. When the positioning protrusion is embedded in the upper positioning hole, the turbid air flowing out of the reversing valve core passes through the inner mesh frame 3 and is directly sent to the single-layer filter element 5 for filtration; when the positioning protrusion is embedded in the lower positioning hole, the turbid air flowing out of the reversing valve core passes through the inner mesh frame 3 and is directly sent to the double-layer filter element 6 for filtration.

[0020] Example 2

[0021] See Figure 1 and Figure 2 As shown, the pre-filter involved in this embodiment is further configured based on embodiment 1, wherein the inner mesh frame 3 is provided with a circumferential limiting hole 17 extending along the axial direction, and a circumferential limiting block 18 is slidably connected in the circumferential limiting hole 17, and the circumferential limiting block 18 is provided on the positioning side circumference 12.

[0022] In this embodiment, the circumferential limiting hole 17, in conjunction with the circumferential limiting block 18, is used to limit the circumferential movement of the reversing valve core 100 relative to the inner mesh frame 3 when it moves axially.

[0023] Example 3

[0024] See Figure 1 and Figure 2 As shown, the pre-filter involved in this embodiment is further configured, based on embodiment 1, with the support rib 10 arranged around the upper wind deflector 8 and the lower wind deflector 9.

[0025] In this embodiment, by circumferentially arranging the support ribs 10 between the upper baffle plate 8 and the lower baffle plate 9, the circumferential airflow is made uniform and the filtration is uniform.

[0026] The pre-filter involved in this utility model can realize two-level switching filtration function, which is flexible and convenient to switch manually, has a low failure rate, strong compatibility, complete overall function, and strong practicality.

[0027] Unless otherwise specified, in this utility model, terms such as "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the actual orientation or positional relationship shown. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe orientation or positional relationships in this utility model are for illustrative purposes only and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood in conjunction with the embodiments and according to the specific circumstances.

[0028] Unless otherwise expressly specified and limited, the terms "set up," "connected," and "linked" in this utility model should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A prefilter comprising a filter cartridge, characterized by: The filter element includes an upper end cover and a lower end cover. An inner mesh frame and an outer mesh frame are provided between the lower end cover and the upper end cover. A single-layer filter element arranged at the top and a double-layer filter element arranged at the bottom are provided between the outer mesh frame and the inner mesh frame. An air inlet is provided on the upper end cover. A reversing valve core that moves axially is slidably connected inside the inner mesh frame. The reversing valve core includes an upper baffle plate and a lower baffle plate. A support rib is connected between the lower baffle plate and the upper baffle plate. An air inlet pipe extending out of the air inlet is connected to the upper baffle plate.

2. The prefilter of claim 1, wherein: An axial positioning component is provided between the reversing valve core and the inner mesh frame.

3. The prefilter of claim 2, wherein: The axial positioning assembly includes a positioning side panel disposed on the upper or lower wind deflector. The positioning side panel is provided with spring clip holes around its circumference. A positioning spring clip connected to the positioning side panel is disposed in the spring clip hole. A positioning protrusion is provided on the positioning spring clip. The inner mesh frame is provided with an upper positioning hole and a lower positioning hole that match the positioning protrusion. When the positioning protrusion is embedded in the upper positioning hole, the reversing valve core matches the single-layer filter core for filtration; when the positioning protrusion is embedded in the lower positioning hole, the reversing valve core matches the double-layer filter core for filtration.

4. The prefilter of claim 3, wherein: The inner mesh frame is provided with a circumferential limiting hole extending along the axial direction, and a circumferential limiting block is slidably connected in the circumferential limiting hole. The circumferential limiting block is located on the positioning side wall.

5. The prefilter according to any one of claims 1 to 4, characterized in that: The supporting ribs are distributed between the upper and lower wind deflectors.

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