Pre-filter

Abstract

The utility model discloses a prefilter which comprises a shell and a filtering assembly, a water inlet and a water outlet are formed in the shell, the filtering assembly is arranged in the shell and divides an inner cavity of the shell into a raw water cavity and a purified water cavity, the water inlet is communicated with the raw water cavity, and the water outlet is communicated with the purified water cavity; the filtering assembly comprises a filtering net and a supporting frame with a hollow inner cavity, and the filtering net is formed by winding net wires on the outer side of the supporting frame. The surface of the filter screen is flat and easy to clean, and stains on the filter screen can be easily washed off through back washing or brush scraping washing, so that the back washing recovery rate of the pre-filter can be improved.

Description

Technical Field

[0001] The utility model relates to a filter, in particular to a pre-filter. Background Art

[0002] With the improvement of people's living standards, the requirement for the quality of domestic water is also increasing. The pre-filter has been widely used in life. The pre-filter generally consists of a shell and a filtering component arranged in the shell. The shell is provided with a water inlet and a water outlet, and the water flow flows out after being filtered by the filtering device in the shell. As Figures 1-3 shown, the filter screen in the filtering component in the prior art is usually woven, and the woven filter screen 10 has the following problems: (1) The woven surface is uneven, and after filtering for a period of time, dirt is easily hidden on the surface and it is difficult to wash it clean. (2) If a stainless steel mesh is used for cross-weaving, the accuracy is difficult to control. (3) Using a brush scraping structure to scrape the woven filter screen 10 has a poor effect and a low reconnection rate. Summary of the Utility Model

[0003] In view of the technical problems existing in the prior art, the utility model provides a pre-filter, in which the filter screen is wound by wire filaments outside the support frame, so that the surface of the filter screen is flat and easy to clean, and the stains on it can be easily washed off by backwashing or brush scraping, thereby improving the backwashing reconnection rate of the pre-filter.

[0004] The technical solution adopted by the utility model to solve its technical problems is: a pre-filter, including a shell and a filtering component, the shell is provided with a water inlet and a water outlet, the filtering component is arranged in the shell and divides the inner cavity of the shell into a raw water cavity and a purified water cavity, the water inlet is communicated with the raw water cavity, and the water outlet is communicated with the purified water cavity; the filtering component includes a filter screen and a support frame with a hollow inner cavity, and the filter screen is wound by wire filaments outside the support frame.

[0005] Further, the wire filaments are wound spirally around the axis of the support frame.

[0006] Further, the cross-section of the wire filament is square.

[0007] Further, the support frame is limited in the shell by a fixed joint.

[0008] Further, the fixed joint is sleeved outside one end of the support frame in the axial direction, and the two are in sealed cooperation; the fixed joint is in sealed cooperation with the shell, and the fixed joint is provided with a plurality of inclined water channels communicating the water inlet and the raw water cavity, and the plurality of inclined water channels are distributed along the circumferential direction of the fixed joint.

[0009] Further, the fixed joint is provided with a plurality of limiting convex portions arranged along its circumferential direction, and the inner wall of the shell is provided with limiting grooves corresponding to the limiting convex portions, and the limiting convex portions are fitted in the limiting grooves.

[0010] Further, the support frame is in a cylindrical structure with at least one end having an opening. Multiple groups of water passing holes are arranged on its peripheral wall along its circumferential direction. Each group of water passing holes respectively includes a plurality of water passing holes arranged along the axial direction of the support frame; a raw water chamber is formed between the filter net fitted outside the support frame and the inner wall of the housing, the inner space of the support frame forms a purified water chamber, and the opening at one end of the support frame communicates with the water outlet.

[0011] Further, the housing includes an upper cover and a lower housing. The upper cover is in a T shape, and its left and right ends are provided with a water inlet and a water outlet, and its lower end is connected to the lower housing, and the filter assembly is installed in the lower housing.

[0012] Further, the upper cover is threadedly connected to the lower housing; the lower housing is made of a transparent material.

[0013] Further, the wire mesh is made of stainless steel wire mesh.

[0014] Compared with the prior art, the present utility model has the following beneficial effects:

[0015] 1. The filter assembly of the present utility model includes a filter net and a support frame with a hollow inner cavity. The filter net is wound around the outside of the support frame by wire mesh, so that the surface of the filter net is flat and easy to clean. Stains on it can be easily washed off by backwashing and brushing, thereby improving the backwashing and reconnection rate of the pre-filter.

[0016] 2. The wire mesh is wound around the axis of the support frame in a spiral shape, and the cross-section of the wire mesh is square, which can further improve the flatness of the surface of the filter net to prevent the intercepted impurities from adhering to the surface.

[0017] 3. The support frame is limited in the housing by a fixed joint, which is convenient for the disassembly and installation of the support frame and convenient for taking out the filter assembly to clean the filter net.

[0018] 4. The wire mesh is made of stainless steel wire mesh. The accuracy of the filter net can be controlled by winding, and the surface of the stainless steel wire mesh can be surface-treated to improve the anti-fouling ability of the filter net and achieve a better flushing effect.

[0019] The following further describes the present utility model in detail with reference to the drawings and embodiments; however, a pre-filter of the present utility model is not limited to the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is an expanded plan view of a woven filter screen in the prior art;

[0021] Figure 2 is a cross-sectional view of the woven filter screen in the prior art after expansion;

[0022] Figure 3 is a top view of the woven filter screen in the prior art after being unfolded;

[0023] Figure 4 is an exploded schematic view of the present utility model;

[0024] Figure 5 is a developed plane schematic view of the filter screen of the present utility model;

[0025] Figure 6 is a sectional schematic view of the filter screen of the present utility model after being unfolded;

[0026] Figure 7 is Figure 6 an enlarged schematic view of part A of;

[0027] Figure 8 is a sectional schematic view of the present utility model;

[0028] In the figure: 1. housing; 11. upper cover; 111. water inlet; 112. water outlet; 12. lower housing; 121. raw water chamber; 122. purified water chamber; 123. limit groove; 2. filter screen; 21. wire mesh; 3. support frame; 31. opening; 32. water passing hole; 4. fixed joint; 41. inclined water channel; 42. limit protrusion; 5. sealing ring; 10. woven filter screen. Specific embodiments

[0029] In the present utility model, in the description, the orientation or positional relationship indicated by "upper", "lower", "left", "right", "inner", "outer", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model, rather than indicating or implying that the device referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the protection scope of the present utility model. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0030] In addition, in the description of the present utility model, unless otherwise specified, "a plurality of" means two or more. In the description of the present utility model, unless otherwise clearly defined and limited, terms such as "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection, it can be a mechanical connection, an electrical connection, it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0031] Please refer to Figures 4-8As shown, a pre-filter of the present invention includes a housing 1 and a filter assembly. The housing 1 is provided with a water inlet 111 and a water outlet 112. The filter assembly is disposed within the housing 1 and divides the inner cavity of the housing 1 into a raw water cavity 121 and a clean water cavity 122. The water inlet 111 is connected to the raw water cavity 121, and the water outlet 112 is connected to the clean water cavity 122. The filter assembly includes a filter screen 2 and a support frame 3 having a hollow inner cavity. The filter screen 2 is formed by winding a mesh 21 around the outer side of the support frame 3.

[0032] Specifically, the mesh wire 21 is spirally wound around the axis of the support frame 3 .

[0033] Preferably, the cross section of the mesh 21 is square, but not limited thereto.

[0034] In this embodiment, the support frame 3 is limited in the shell 1 by a fixed joint 4. The fixed joint 4 is sleeved on the outside of one axial end of the support frame 3, and the two are sealed together. The fixed joint 4 and the shell 1 are sealed together by a sealing ring 5, and the fixed joint 4 is provided with a plurality of inclined water channels 41 connecting the water inlet 111 and the raw water chamber 121, and the plurality of inclined water channels 41 are distributed along the circumference of the fixed joint 4. The fixed joint 4 is provided with a plurality of limiting protrusions 42 arranged along its circumference, and the inner wall of the shell 1 is provided with a limiting groove 123 corresponding to the limiting protrusion 42. The limiting protrusion 42 is matched in the limiting groove 123, thereby facilitating the disassembly and installation of the support frame 3, so that the support frame 3 can be taken out to clean the filter screen 2.

[0035] The support frame 3 is a cylindrical structure with an opening 31 at one end. Its circumferential wall is provided with multiple groups of water holes 32 arranged along its circumference. Each group of water holes 32 includes multiple water holes 32 arranged axially along the support frame 3. A raw water chamber 121 is formed between the filter screen 2 on the outside of the support frame 3 and the inner wall of the housing 1. The interior space of the support frame 3 forms a purified water chamber 122. The opening 31 at one end of the support frame 3 communicates with the water outlet 112.

[0036] The housing 1 includes an upper cover 11 and a lower housing 12. The upper cover 11 is T-shaped, with a water inlet 111 and a water outlet 112 at its left and right ends. Its lower end is connected to the lower housing 12, and the filter assembly is installed in the lower housing 12. Specifically, the upper cover 11 is threadedly connected to the lower housing 12, and the lower housing 12 is made of transparent material.

[0037] In this embodiment, the mesh 21 is a stainless steel mesh. The anti-fouling ability of the filter 2 can be improved by performing surface treatment on the surface of the stainless steel mesh, thereby achieving a better flushing effect.

[0038] A pre-filter of the present utility model. When water flow enters from the water inlet 111, it enters the raw water chamber 121 through the inclined water channel 41 on the fixed joint 4. The water flow enters the purified water chamber 122 from the raw water chamber 121 through the water passing holes 32 on the support frame 3. At the same time, due to the filter net 2 outside the support frame 3, impurities are blocked in the raw water chamber 121. At this time, the filtered water flow flows out from the purified water chamber 122 through the opening 31 of the support frame 3 from the water outlet 112. Specifically, the water flow path is as Figure 8 shown by the arrow.

[0039] A pre-filter of the present utility model. The filter net 2 is made of square stainless steel wire wound spirally around the axis of the support frame 3. High-precision equipment can be used to control the precision of the filter net 2 at about 30 microns, making the surface of the filter net 2 flat and easy to clean. When impurities are intercepted and attached to the surface of the filter net 2, backwashing and brush scraping can easily wash off the attached impurities, thereby improving the backwashing and reopening rate of the pre-filter. In the prior art, the woven filter net 10, as Figures 1-3 shown, has an uneven surface. When flushing or scraping with a brush, impurities will be hidden in the woven surface, resulting in incomplete flushing and a low reopening rate.

[0040] For a pre-filter of the present utility model, the parts not involved are the same as or can be implemented by the prior art.

[0041] The above embodiments are only used to further illustrate a pre-filter of the present utility model. However, the present utility model is not limited to the embodiments. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the technical solution of the present utility model.

Claims

1. A pre-filter, comprising a housing and a filtering component. The housing is provided with a water inlet and a water outlet. The filtering component is arranged inside the housing and divides the inner cavity of the housing into a raw water cavity and a purified water cavity. The water inlet is communicated with the raw water cavity, and the water outlet is communicated with the purified water cavity. It is characterized in that: The filtering component includes a filter screen and a support frame with a hollow inner cavity, and the filter screen is wound by wire meshes outside the support frame.

2. The pre-filter according to claim 1, wherein: The wire meshes are wound spirally around the axis of the support frame.

3. The pre-filter according to claim 1, wherein: The cross-section of the wire meshes is square.

4. The pre-filter according to claim 1, characterized in that: The support frame is limited in the shell through a fixed joint.

5. The pre-filter according to claim 4, characterized in that: The fixed joint is sleeved outside one axial end of the support frame, and the two are in sealed cooperation; the fixed joint is in sealed cooperation with the shell, and the fixed joint is provided with a plurality of inclined water channels communicating the water inlet and the raw water cavity, and the plurality of inclined water channels are distributed along the circumferential direction of the fixed joint.

6. The pre-filter according to claim 5, characterized in that: The fixed joint is provided with a plurality of limiting convex parts arranged along its circumferential direction, and the inner wall of the shell is provided with limiting grooves corresponding to the limiting convex parts, and the limiting convex parts are fitted in the limiting grooves.

7. The pre-filter according to any one of claims 1-6, characterized in that: The support frame is in a cylindrical structure with at least one end having an opening, and multiple groups of water passing holes arranged along its circumferential direction are provided on its peripheral wall. Each group of water passing holes respectively includes a plurality of water passing holes arranged along the axial direction of the support frame; the raw water cavity is formed between the filter screen fitted outside the support frame and the inner wall of the shell, the inner space of the support frame forms the purified water cavity, and the opening at one end of the support frame communicates with the water outlet.

8. The pre-filter according to claim 1, characterized in that: The shell includes an upper cover and a lower shell. The upper cover is in a T shape, and the water inlet and the water outlet are provided at its left and right ends, and its lower end is connected to the lower shell, and the filtering component is installed in the lower shell.

9. The pre-filter according to claim 8, characterized in that: The upper cover is in threaded connection with the lower shell; the lower shell is made of a transparent material.

10. The pre-filter according to claim 1, characterized in that: The wire meshes are made of stainless steel wire meshes.

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