Filter with check valve for easy installation

Abstract

The utility model relates to a filter convenient to install check valve, including filter casing, the filter screen of setting in the inside of filter casing, one end of filter casing can dismantle and be equipped with filter lower end cover, the inside of filter lower end cover is equipped with the first limit protruding for installing check valve, the hollow design of the first limit protruding in the filter of the utility model combines filter lower end cover bottom, can effectively complete the installation to check valve, has saved the space required for the traditional installation check valve in the water inlet or water outlet of pipeline, makes filter overall structure more compact.

Description

Technical Field

[0001] This utility model relates to the field of filter technology, specifically to a filter that facilitates the installation of a check valve. Background Technology

[0002] The primary function of a washing machine pre-filter is to remove sediment, bacteria, microbial debris, rust, sand, and other particulate impurities larger than 5 microns from the pipes, preventing harm to the human body and skin. It also plays a positive role in protecting downstream pipes, water purifiers, water heaters, washing machines, high-end faucets, and showerheads. A pre-filter can also be fitted with a "hydrochloric acid polyphosphate" scale inhibitor filter element to prevent scale buildup in solar water heaters and water dispensers. Authorization announcement number CN104674517B discloses a filter and a washing machine. According to its specification and drawings, the filter includes a filter cylinder and a filter screen. The cylinder has an inlet, an outlet, and a drain outlet. The filter screen is installed in the cylinder and divides the inner cavity of the filter cylinder into an inner cavity and an outer cavity. The upper end of the inner cavity is connected to the inlet, and the lower end is connected to the drain outlet. The outer cavity is connected to the outlet.

[0003] However, the solution has certain limitations: 1. There is no corresponding structural position inside the cylinder to install a check valve. If there is no check valve, the filter may be sucked down and deformed or even broken and leaked due to the imbalance of internal and external pressure when a negative pressure is generated in the pipeline. 2. If the outlet pressure is higher than the inlet pressure, the water flow may flow backward through the filter element, flushing the trapped impurities back into the pipeline, causing secondary pollution of the filtered water source. Summary of the Invention

[0004] This utility model mainly addresses the problems existing in the use of filters and has invented a filter that facilitates the installation of check valves. The hollow design of the first limiting protrusion inside the filter, combined with the bottom of the filter's lower end cover, can effectively complete the installation of the one-way valve, saving the space required for the traditional installation of one-way valves at the inlet or outlet of the pipeline, and making the overall structure of the filter more compact.

[0005] The objective of this invention is achieved through the following technical solution: a filter that facilitates the installation of a check valve, comprising a filter housing, a filter screen disposed inside the filter housing, a filter lower end cover detachably provided at one end of the filter housing, and a first limiting protrusion for installing a one-way valve provided inside the filter lower end cover.

[0006] Preferably, the end of the filter housing is provided with a first threaded boss, the interior of the lower end cover of the filter is provided with a first threaded groove adapted to the first threaded boss, and the side wall of the filter housing is provided with an annular limiting plate above the first threaded boss.

[0007] Preferably, the interior of the first limiting protrusion is hollow and the one-way valve is installed inside the first limiting protrusion. The interior of the lower end cover of the filter is also provided with a second limiting protrusion. The first limiting protrusion and the second limiting protrusion are hollow columnar.

[0008] Preferably, the height of the first limiting protrusion is greater than that of the second limiting protrusion, and the bottom of the filter screen is fitted into the gap between the first limiting protrusion and the second limiting protrusion. This design is to increase the limiting friction force on the end of the filter screen while simultaneously satisfying the installation limiting of the one-way valve.

[0009] Preferably, the inner sidewall of the filter housing is provided with limiting ribs and the top of the filter housing is provided with limiting bosses. The limiting ribs and limiting bosses are used to limit the sidewall and top of the filter screen, respectively.

[0010] Preferably, the other end of the filter housing is integrally provided with a filter top cover, the filter top cover is provided with an annular support boss and a second threaded inner groove inside, and the filter top cover is connected to the external water passage through the second threaded inner groove.

[0011] Preferably, the lower end cap of the filter is provided with a columnar outlet, and the surface of the columnar outlet is provided with an annular groove for snapping into external pipes or connectors. The annular groove is designed to enable quick insertion and assembly with external connectors.

[0012] Preferably, a rubber sealing gasket is provided between the bottom of the filter housing and the inside of the filter lower end cover, and a rubber sealing gasket is also provided between the top of the annular support boss and the external water passage. The rubber sealing gasket is designed to prevent water leakage after the filter housing and the filter lower end cover are installed.

[0013] Preferably, the interior of the second threaded inner groove can also be connected to one end of a threaded connector. The bottom of the threaded connector is provided with a second threaded boss adapted to the second threaded inner groove, and the top of the threaded connector is provided with a third threaded inner groove adapted to an external water interface. The diameter of the third threaded inner groove is different from the diameter of the second threaded inner groove. Compared with the prior art, the present invention has the following beneficial effects: 1. The hollow design of the first limiting protrusion, combined with the bottom of the filter's lower end cover, effectively completes the installation of the check valve, saving the space required for installing the check valve at the inlet or outlet of the pipeline in the traditional way, making the overall structure of the filter more compact; the check valve can be pre-installed inside the first limiting protrusion of the filter's lower end cover, simplifying the assembly process and avoiding the step of installing the check valve separately in the traditional pipeline solution. The check valve can be removed at the same time when the filter's lower end cover is removed later, making it convenient for inspection and replacement; The combined design of the limiting ribs and limiting bosses makes the installation position of the filter screen more precise, avoiding the assembly deviation that may occur with the traditional single limiting method. The dual limiting structure of the limiting ribs and limiting bosses effectively prevents the filter screen from displacement and vibration under fluid impact. The precise limiting ensures the best fit clearance between the filter screen and the housing, avoids the sideflow phenomenon, improves the filtration efficiency, and improves the stability of the overall structure. Attached Figure Description

[0014] Figure 1 This is a perspective view of the present utility model; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is an exploded cross-sectional view of the present invention; Figure 4 This is an exploded view of the present invention.

[0015] The markings in the diagram are as follows: 1. Filter housing; 11. First threaded boss; 12. Annular limiting plate; 13. Limiting rib; 14. Limiting boss; 2. Filter lower end cover; 21. First limiting protrusion; 22. First threaded inner groove; 23. Second limiting protrusion; 24. Columnar outlet; 25. Annular groove; 3. Check valve; 5. Filter screen; 6. Filter upper end cover; 61. Annular support boss; 62. Second threaded inner groove; 7. Rubber sealing gasket; 8. Threaded joint; 81. Second threaded boss; 82. Third threaded inner groove. Detailed Implementation

[0016] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings: like Figure 1 and Figure 3As shown, a filter for easy installation of a check valve includes a filter housing 1, with a detachable lower end cover 2 at one end. The end of the filter housing 1 has a first threaded boss 11, and the interior of the lower end cover 2 has a first threaded groove 22 adapted to the first threaded boss 11. An annular limiting plate 12 is provided on the side wall of the filter housing 1 above the first threaded boss 11. A rubber sealing gasket 7 is provided between the bottom of the filter housing 1 and the interior of the lower end cover 2. The rubber sealing gasket 7 is designed to prevent water leakage after installation between the filter housing 1 and the lower end cover 2.

[0017] With this configuration, during the installation of the lower filter cap 2 onto the end of the filter housing 1, the first threaded groove 22 of the lower filter cap 2 is screwed into the surface of the first threaded boss 11. During continuous rotation, the top of the lower filter cap 2 is pressed against the bottom of the annular limiting plate 12. The design of the annular limiting plate 12 restricts the position of the lower filter cap 2 at the end of the filter housing 1.

[0018] Please continue to refer to this. Figure 2 The filter lower end cover 2 is provided with a first limiting protrusion 21 for installing a one-way valve 3. Specifically, the interior of the first limiting protrusion 21 is hollow and the one-way valve 3 is installed inside the first limiting protrusion 21.

[0019] The lower end cover 2 of the filter is provided with a columnar outlet 24. The surface of the columnar outlet 24 is provided with an annular groove 25 adapted to be snapped into an external pipe or connector. The middle part of the first limiting protrusion 21 is in communication with the columnar outlet 24.

[0020] The hollow design of the first limiting protrusion 21, combined with the bottom of the filter lower end cover 2, can effectively complete the installation of the one-way valve 3, saving the space required for the traditional installation of one-way valves at the inlet or outlet of the pipeline, making the overall structure of the filter more compact; the one-way valve 3 can be pre-installed inside the first limiting protrusion 21 of the filter lower end cover 2, simplifying the assembly process and avoiding the process of installing the one-way valve 3 separately in the traditional pipeline solution. When the filter lower end cover 2 is removed later, the one-way valve 3 can be removed at the same time for easy inspection and replacement.

[0021] The middle part of the first limiting protrusion 21 is in communication with the columnar outlet 24, which reduces fluid turning and pressure loss. The precise positioning of the one-way valve 3 by the first limiting protrusion 21 ensures that the one-way valve 3 and the first limiting protrusion 21 are on the same axis. The valve core and valve seat inside the one-way valve 3 function normally, and the water flowing back from the columnar outlet 24 can be blocked in time to prevent it from flowing back into the filter housing 1.

[0022] In this embodiment, the filter housing 1 has a filter screen 5 inside, and the lower end cover 2 of the filter also has a second limiting protrusion 23 inside. The first limiting protrusion 21 and the second limiting protrusion 23 are hollow columnar. The height of the first limiting protrusion 21 is greater than that of the second limiting protrusion 23, and the bottom of the filter screen 5 is fitted into the gap between the first limiting protrusion 21 and the second limiting protrusion 23.

[0023] Filter 5 can intercept large particles of impurities in the water, such as sediment, rust, and insect eggs, preventing these impurities from entering the washing machine and causing wear or blockage, thus extending the washing machine's lifespan. Filter 5 can remove suspended solids from the water, reducing harmful substances such as scale and rust, indirectly improving the water safety of the washing machine.

[0024] The filter housing 1 has a limiting rib 13 on its inner side wall and a limiting boss 14 on its inner top. The limiting rib 13 and the limiting boss 14 are used to limit the side wall and top of the filter screen 5, respectively.

[0025] The combined design of the limiting ribs 13 and the limiting bosses 14 makes the installation position of the filter screen 5 more precise, avoiding the assembly deviation that may occur with the traditional single limiting method. The double limiting structure of the limiting ribs 13 and the limiting bosses 14 effectively prevents the filter screen from shifting and vibrating under fluid impact. The precise limiting ensures the best fit clearance between the filter screen and the housing, avoids sideflow phenomenon, improves filtration efficiency, and improves the stability of the overall structure. The reasonable arrangement of the limiting ribs 13 can guide the fluid flow and reduce the generation of eddies.

[0026] In this embodiment, the other end of the filter housing 1 is integrally provided with a filter upper cover 6, and the filter upper cover 6 has an annular support boss 61 and a second threaded inner groove 62 inside. A rubber sealing gasket 7 is also provided between the top of the annular support boss 61 and the external water channel.

[0027] The filter's upper cover 6 is connected to the external water passage via the second threaded inner groove 62, and the rubber sealing gasket 7 prevents water leakage after installation.

[0028] In order to accommodate the external threads of different specifications of water outlets, the interior of the second threaded inner groove 62 can also be connected to one end of the threaded connector 8. The bottom of the threaded connector 8 is provided with a second threaded boss 81 adapted to the second threaded inner groove 62, and the top of the threaded connector 8 is provided with a third threaded inner groove 82 adapted to the external water interface. The diameter of the third threaded inner groove 82 is different from the diameter of the second threaded inner groove 62.

[0029] Working principle and usage of this utility model: The filter can be connected to the external water system via the upper cover 6 and the second threaded groove 62; or the threaded connector 8 can be connected to the upper cover 6 via the second threaded boss 81, and then connected to the external water system interface via the third threaded groove 82.

[0030] Then, the columnar water outlet 24 at the lower end of the filter cap 2 is connected to the washing machine's pipes or connectors via an annular groove 25. Water passes sequentially through the upper end of the filter cap 6 and the interior of the filter housing 1. The filter screen 5 intercepts large particles of impurities in the water, such as mud, rust, and insect eggs, and then discharges them through the columnar water outlet 24.

[0031] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A filter for easy installation of a check valve, comprising a filter housing (1) and a filter screen (5) disposed inside the filter housing (1), characterized in that, The filter housing (1) is provided with a detachable filter lower end cover (2) at one end, and the filter lower end cover (2) is provided with a first limiting protrusion (21) for installing a one-way valve (3) inside.

2. The filter with an easy-to-install check valve according to claim 1, characterized in that, The filter housing (1) has a first threaded boss (11) at its end, and the filter lower end cover (2) has a first threaded inner groove (22) adapted to the first threaded boss (11) inside. The side wall of the filter housing (1) is provided with an annular limiting plate (12) above the first threaded boss (11).

3. The filter with an easy-to-install check valve according to claim 2, characterized in that, The first limiting protrusion (21) is hollow inside and the one-way valve (3) is installed inside the first limiting protrusion (21). The filter lower end cover (2) is also provided with a second limiting protrusion (23). The first limiting protrusion (21) and the second limiting protrusion (23) are hollow columnar.

4. The filter with an easy-to-install check valve according to claim 3, characterized in that, The height of the first limiting protrusion (21) is greater than that of the second limiting protrusion (23), and the bottom of the filter screen (5) is stuck in the gap between the first limiting protrusion (21) and the second limiting protrusion (23).

5. The filter with an easy-to-install check valve according to claim 4, characterized in that, The filter housing (1) has a limiting rib (13) on its inner sidewall and a limiting boss (14) on its inner top. The limiting rib (13) and the limiting boss (14) are used to limit the sidewall and top of the filter screen (5), respectively.

6. The filter with an easy-to-install check valve according to claim 1, characterized in that, The filter housing (1) has an integrally extended upper cover (6) at the other end. The upper cover (6) has an annular support boss (61) and a second threaded groove (62) inside. The upper cover (6) is connected to the external water channel through the second threaded groove (62).

7. The filter with an easy-to-install check valve according to claim 6, characterized in that, The lower end cap (2) of the filter is provided with a columnar outlet (24), and the surface of the columnar outlet (24) is provided with an annular groove (25) adapted to be snapped into external pipes or connectors.

8. The filter with an easy-to-install check valve according to claim 7, characterized in that, A rubber sealing gasket (7) is provided between the bottom of the filter housing (1) and the interior of the filter lower end cover (2), and a rubber sealing gasket (7) is also provided between the top of the annular support boss (61) and the external water channel.

9. The filter with an easy-to-install check valve according to claim 6, characterized in that, The interior of the second threaded inner groove (62) can also be connected to one end of the threaded joint (8). The bottom of the threaded joint (8) is provided with a second threaded boss (81) adapted to the second threaded inner groove (62). The top of the threaded joint (8) is provided with a third threaded inner groove (82) adapted to the external water interface. The diameter of the third threaded inner groove (82) is different from the diameter of the second threaded inner groove (62).

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