Filter shell

Abstract

The filter shell comprises a shell, a liquid inlet cavity, a filter cavity, a bypass cavity and a pollution discharge cavity are sequentially arranged in the shell from top to bottom, the liquid inlet cavity is communicated with the filter cavity through a liquid inlet hole, the filter cavity is communicated with the middle of the bypass cavity through a bypass hole, and the filter cavity is communicated with the edge of the bypass cavity through a return hole. A one-way valve is arranged in the return hole, the inner diameter of the sewage discharging cavity is larger than that of the bypass cavity, an upper sealing plate which slides vertically is arranged in the liquid inlet cavity and used for opening and closing the liquid inlet hole, and a lower sealing plate which slides vertically is arranged in the bypass cavity and used for opening and closing the bypass hole and the return hole. The side wall of the lower sealing plate abuts against the bypass cavity in a sealed mode, and when the lower sealing plate moves downwards to the pollution discharge cavity, the pollution discharge cavity is communicated with the bypass hole. According to the filter shell disclosed by the utility model, the bypass valve structure is convenient to install, and the liquid inlet hole can be closed when the filter cartridge is backwashed, so that impurity particle residues in the liquid inlet cavity and an inlet are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of filters, in particular to a filter housing. Background Art

[0002] In the existing filter housing, when the filter cartridge is clogged, the medium can be discharged through the bypass valve to avoid high pressure in the filter housing. However, the bypass valve is usually set in the housing between the inlet and the outlet, and the installation requires the help of the outlet, which is inconvenient to operate. In addition, when the filter cartridge is clogged and backwashing is required, the backwashing liquid is mostly discharged through the liquid inlet cavity and the inlet. There are impurity particles remaining in the solution at the liquid inlet cavity and the inlet. Subsequent medium filtration will bring the remaining impurity particles back into the filter cartridge, causing the filter cartridge to be clogged. Utility Model Content

[0003] The utility model provides a filter housing, which is convenient for installing a bypass valve structure, and when the filter cartridge is backwashed, the liquid inlet hole can be closed to avoid residual impurities in the liquid inlet cavity and the inlet.

[0004] The technical solution of the utility model is achieved as follows: a filter housing comprises an outer shell, in which a liquid inlet chamber, a filter chamber, a bypass chamber and a sewage discharge chamber are sequentially arranged from top to bottom, the liquid inlet chamber and the filter chamber are communicated through a liquid inlet hole, the filter chamber and the middle part of the bypass chamber are communicated through a bypass hole, the filter chamber and the edge of the bypass chamber are communicated through a return hole, a one-way valve is arranged in the return hole, the inner diameter of the sewage discharge chamber is larger than that of the bypass chamber, a vertically sliding upper sealing plate is arranged in the liquid inlet chamber, the upper sealing plate is used for opening and closing the liquid inlet hole, a vertically sliding lower sealing plate is arranged in the bypass chamber, the lower sealing plate is used for opening and closing the bypass hole and the return hole, the side wall of the lower sealing plate is sealed against the bypass chamber, and when the lower sealing plate moves down to the sewage discharge chamber, the sewage discharge chamber and the bypass hole are communicated.

[0005] Furthermore, it also includes a shaft rod, the upper end of which is located above the housing and is fixed with an upper limit plate, and the lower end slides through the upper support spring, the liquid inlet cavity, the liquid inlet hole, the filter cavity, the lower sealing plate, the lower support spring, and the lower limit plate in sequence, and is screwed with a limit nut, the upper sealing plate is fixedly connected to the shaft rod, and a push block is screwed on the shaft rod at the upper end of the lower sealing plate. When the shaft rod moves downward, the push block can push the lower sealing plate downward, and if the shaft rod does not move downward and the filter cartridge is blocked and the pressure increases, the lower sealing plate can also be pushed downward and the lower support spring can be compressed.

[0006] Furthermore, the outer shell includes an upper shell, an upper end plate is fixed in the upper shell, the liquid inlet chamber is located on the upper side of the upper end plate, the liquid inlet hole is provided on the upper end plate, the upper sealing plate is located above the upper end plate, an inlet is provided on the outer shell between the upper sealing plate and the upper end plate, a cylinder is screwed at the lower end of the upper shell, an outlet is provided on the side wall of the cylinder, the lower end plate is located on the lower side of the outlet, a filter chamber is provided between the lower end plate and the upper end plate, the bypass hole and the return hole are both provided on the lower end plate, the bypass chamber is located on the lower side of the lower end plate, the upper end of the lower sealing plate is sealed against the lower end plate.

[0007] Furthermore, an annular groove is provided at the lower end of the upper end plate and the upper end of the lower end plate, the annular groove is used to install the filter cartridge, the liquid inlet hole is located on the inner side of the annular groove of the upper end plate, the bypass hole is located on the inner side of the annular groove of the lower end plate, and the return hole is located on the outer side of the annular groove of the lower end plate.

[0008] Furthermore, the shaft rod slides through the lower end plate, and a mounting groove is provided on the lower surface of the lower end plate, and the push block is placed in the mounting groove.

[0009] Furthermore, the downward movement distance of the upper sealing plate is greater than the vertical length of the bypass chamber.

[0010] Furthermore, the one-way valve includes a compression spring, a sealing ball and a hollow plug which are sequentially arranged in the return hole from top to bottom. The inner diameter of the plug is smaller than the outer diameter of the sealing ball, and the plug is interference fixed in the return hole.

[0011] Beneficial effects of the utility model:

[0012] The utility model forms a bypass valve structure through the vertical sliding of the lower sealing plate. When the filter cartridge is blocked, the lower sealing plate moves downward, the bypass hole and the return hole are opened, and the medium is discharged through the outlet. Since the inner diameter of the sewage discharge chamber is larger than the bypass chamber, the installation of the bypass valve structure is convenient. In addition, when the filter cartridge needs to be backwashed, the upper sealing plate moves downward to close the liquid inlet hole, and the lower sealing plate moves downward into the sewage discharge chamber. The sewage discharge chamber and the bypass hole are connected, and the sewage from the backwashing can be discharged through the sewage discharge chamber without passing through the liquid inlet chamber and the inlet.

[0013] The utility model forms an elastic bypass valve through the cooperation of the lower sealing plate, the lower supporting spring and the lower limiting plate, which can automatically open and close the bypass hole according to the pressure in the filter cartridge; and through the cooperation of the shaft rod, the upper supporting spring, the upper sealing plate, the push block and the lower sealing plate, if backwashing of the filter cartridge is required, the shaft rod can be pressed downward, and the operation is simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a structural schematic diagram of the utility model;

[0016] Figure 2 for Figure 1 A partial enlarged view of middle A.

[0017] Upper shell 1, upper end plate 2, liquid inlet chamber 3, inlet 4, cylinder 5, outlet 6, lower end plate 7, filter chamber 8, liquid inlet hole 9, annular groove 10, filter cartridge 11, bypass hole 12, return hole 13, bypass chamber 14, one-way valve 15, upper sealing plate 16, lower sealing plate 17, shaft 18, upper limit plate 19, upper support spring 20, lower support spring 21, lower limit plate 22, limit nut 23, push block 24, sewage discharge chamber 25, compression spring 26, sealing ball 27, plug 28. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] Example 1

[0020] like Figure 1 As shown, a filter housing comprises an outer shell, which comprises an upper shell 1, an upper end plate 2 is fixed inside the upper shell 1, the upper side of the upper end plate 2 is a liquid inlet cavity 3, an inlet 4 is arranged on the side wall of the liquid inlet cavity 3, a cylinder 5 is screwed on the lower end of the upper shell 1, the cylinder 5 is arranged coaxially with the upper shell 1, and the upper and lower ends of the cylinder 5 are both open ends.

[0021] An outlet 6 is provided on the side wall of the cylinder 5, and a lower end plate 7 is fixed in the cylinder 5 below the outlet 6. A filter chamber 8 is provided between the lower end plate 7 and the upper end plate 2. A liquid inlet hole 9 is provided in the middle of the upper end plate 2. The liquid inlet chamber 3 and the filter chamber 8 are communicated through the liquid inlet hole 9. An annular groove 10 is provided at the lower end of the upper end plate 2 and the upper end of the lower end plate 7. The annular groove 10 is used to install a filter cartridge 11. The liquid inlet hole 9 is located inside the annular groove 10 of the upper end plate 2, and the inner side of the filter cartridge 11 is aligned with the liquid inlet hole 9. A bypass hole 12 is provided on the inner side of the annular groove 10 of the lower end plate 7, a return hole 13 is provided on the outer side of the annular groove 10 of the lower end plate 7, the lower side of the lower end plate 7 is a bypass chamber 14, the inner side of the filter cartridge 11 is communicated with the bypass chamber 14 through the bypass hole 12, the bypass chamber 14 is communicated with the outer side of the filter cartridge 11 through the return hole 13, a one-way valve 15 is fixed in the return hole 13, the medium can only enter the outer side of the filter cartridge 11 through the bypass chamber 14, and then be discharged through the outlet 6, and cannot flow in the reverse direction.

[0022] A vertically sliding upper sealing plate 16 is provided in the liquid inlet chamber 3, and the upper sealing plate 16 is used for opening and closing the liquid inlet hole 9. A vertically sliding lower sealing plate 17 is provided in the bypass chamber 14, and the lower sealing plate 17 is used for opening and closing the bypass hole 12 and the return hole 13. A filter housing also includes a shaft rod 18, the upper end of which is located above the outer side of the upper shell 1, and is fixed with an upper limit plate 19, and the lower end slides through the upper support spring 20, the liquid inlet chamber 3, the liquid inlet hole 9, the filter chamber 8, the lower end plate 7, the lower sealing plate 17, the lower support spring 21, and the lower limit plate 22 in sequence, and is screwed with a limit nut 23, the upper sealing plate 16 is fixedly connected to the shaft rod 18, and a push block 24 is screwed on the shaft rod 18 at the upper end of the lower sealing plate 17. An assembly groove is provided on the lower surface of the lower end plate 7, and the push block 24 is placed in the assembly groove. This structure facilitates the upper end of the lower sealing plate 17 to be sealed against the lower end plate 7.

[0023] The lower side of the bypass chamber 14 is a drainage chamber 25, the inner diameter of which is larger than that of the bypass chamber 14, the side wall of the lower sealing plate 17 is sealed against the bypass chamber 14, and when the lower sealing plate 17 moves down to the drainage chamber 25, the drainage chamber 25 is connected to the bypass hole 12. The downward movement distance of the upper sealing plate 16 is greater than the vertical length of the bypass chamber 14, ensuring that when the upper sealing plate 16 moves down to close the liquid inlet hole 9, the lower sealing plate 17 can move into the drainage chamber 25.

[0024] The method of using the filter housing 1 is as follows: the filter cartridge 11 is installed in the filter chamber 8, the medium enters the liquid inlet chamber 3 through the inlet 4, then enters the side wall of the filter cartridge 11 through the liquid inlet hole 9 for filtration, and is discharged through the outlet 6. If the filter cartridge 11 is blocked, the medium in the filter cartridge 11 pushes the lower sealing plate 17 downward, the lower support spring 21 is compressed, enters the bypass chamber 14, then enters the outside of the filter cartridge 11 through the one-way valve 15, and is then discharged through the outlet 6.

[0025] If it is necessary to backwash the filter cartridge 11, press the shaft 18 downward, the upper support spring 20 is compressed, the shaft 18 drives the upper sealing plate 16 to move downward, closes the liquid inlet 9, and at the same time the shaft 18 drives the push block 24 to push the lower sealing plate 17 downward into the sewage discharge chamber 25. The flushing liquid enters the filter chamber 8 through the outlet 6, enters the filter cartridge 11 through the outside of the filter cartridge 11, and is finally discharged through the sewage discharge chamber 25. After backwashing, release the shaft 18.

[0026] Example 2

[0027] This embodiment is basically the same as embodiment 1, except that: Figure 2 As shown, the one-way valve 15 includes a compression spring 26, a blocking ball 27 and a hollow plug 28 which are sequentially arranged in the return hole 13 from top to bottom. The inner diameter of the plug 28 is smaller than the outer diameter of the blocking ball 27, and the plug 28 is interference-fixed in the return hole 13. The liquid in the bypass chamber 14 pushes the plug 28 upward, the compression spring 26 is compressed, and the return hole 13 is opened. The one-way valve 15 can also be other structures.

[0028] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A filter housing, comprising a housing, characterized in that: A liquid inlet chamber, a filter chamber, a bypass chamber and a sewage discharge chamber are sequentially arranged in the shell from top to bottom. The liquid inlet chamber and the filter chamber are communicated with each other through a liquid inlet hole, the filter chamber is communicated with the middle of the bypass chamber through a bypass hole, the filter chamber is communicated with the edge of the bypass chamber through a return hole, a one-way valve is arranged in the return hole, the inner diameter of the sewage discharge chamber is larger than that of the bypass chamber, a vertically sliding upper sealing plate is arranged in the liquid inlet chamber, the upper sealing plate is used for opening and closing the liquid inlet hole, a vertically sliding lower sealing plate is arranged in the bypass chamber, the lower sealing plate is used for opening and closing the bypass hole and the return hole, the side wall of the lower sealing plate is sealed against the bypass chamber, and when the lower sealing plate moves down to the sewage discharge chamber, the sewage discharge chamber and the bypass hole are communicated.

2. A filter housing according to claim 1, characterized in that: It also includes a shaft rod, the upper end of which is located above the shell and is fixed with an upper limit plate, and the lower end slides through the upper support spring, the liquid inlet chamber, the liquid inlet hole, the filter chamber, the lower sealing plate, the lower support spring, and the lower limit plate in sequence, and is screwed with a limit nut, the upper sealing plate is fixedly connected to the shaft rod, and a push block is screwed on the shaft rod at the upper end of the lower sealing plate.

3. A filter housing according to claim 2, characterized in that: The outer shell includes an upper shell, an upper end plate is fixed in the upper shell, the liquid inlet chamber is located on the upper side of the upper end plate, the liquid inlet hole is arranged on the upper end plate, the upper sealing plate is located above the upper end plate, an inlet is arranged on the outer shell between the upper sealing plate and the upper end plate, a cylinder is screwed at the lower end of the upper shell, an outlet is arranged on the side wall of the cylinder, the lower end plate is located at the lower side of the outlet, a filter chamber is formed between the lower end plate and the upper end plate, the bypass hole and the return hole are both arranged on the lower end plate, the bypass chamber is located on the lower side of the lower end plate, the upper end of the lower sealing plate is sealed against the lower end plate.

4. A filter housing according to claim 3, characterized in that: The lower end of the upper end plate and the upper end of the lower end plate are both provided with an annular groove, the annular groove is used to install the filter cartridge, the liquid inlet hole is located on the inner side of the annular groove of the upper end plate, the bypass hole is located on the inner side of the annular groove of the lower end plate, and the return hole is located on the outer side of the annular groove of the lower end plate.

5. A filter housing according to claim 3 or 4, characterized in that: The shaft rod slides through the lower end plate, and a mounting groove is arranged on the lower surface of the lower end plate, and the push block is placed in the mounting groove.

6. A filter housing according to claim 1, characterized in that: The downward movement distance of the upper sealing plate is greater than the vertical length of the bypass chamber.

7. A filter housing according to claim 1, characterized in that: The one-way valve comprises a compression spring, a sealing ball and a hollow plug which are sequentially arranged in the return hole from top to bottom. The inner diameter of the plug is smaller than the outer diameter of the sealing ball, and the plug is interference fixed in the return hole.

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