Valve head assembly and backwashing filter

Abstract

The utility model belongs to the technical field of filters, and discloses a valve head assembly and a backwashing filter. The valve head assembly is used for backwashing the filter, the valve head assembly comprises a valve head and a backwashing filter screen, an extension part is arranged on the outer wall of the valve head, and a washing water inlet hole is formed in the extension part; the backwashing filter screen is integrally arranged on the extension part and covers the washing water inlet hole. The backwashing filter screen and the valve head are of an integrated structure and do not need to be assembled independently, so that the number of parts of the backwashing filter is reduced, the overall assembly is simplified, the assembly efficiency is improved, and the cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of filters, in particular to a valve head assembly and a backwash filter. Background Art

[0002] A pre-filter is the first coarse filter for water throughout the house, filtering out large particles like silt, rust, insect eggs, and bloodworms. Pre-filters are typically installed at the front end of pipes and can meet the water purification needs of the entire house's water supply, including the kitchen, appliance, and bathroom systems.

[0003] Most pre-filters have a backwash function to flush away impurities remaining on the filter screen. Currently, the backwash screen of a pre-filter is typically fixed to a filter frame within the filter bottle. The backwash screen and filter frame are connected using a snap-fit ​​mechanism. This requires separate component fabrication and assembly, resulting in a complex structure, low assembly efficiency, and high costs. Utility Model Content

[0004] The purpose of the utility model is to provide a valve head assembly and a backwash filter, which can solve the problems of complex structure, low assembly efficiency and high cost caused by the backwash filter being prepared separately and then assembled.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] A valve head assembly for backwashing a filter, the valve head assembly comprising:

[0007] A valve head, wherein an outer wall of the valve head is provided with an extension portion, and the extension portion is provided with a flushing water inlet hole;

[0008] A backwash filter is integrally provided on the extension portion and covers the flushing water inlet hole.

[0009] As an optional solution to the above-mentioned valve head assembly, the backwash filter is embedded in the extension portion.

[0010] As an optional solution of the above-mentioned valve head assembly, the valve head includes an insert molded part and a metal part sleeved outside the insert molded part, and the insert molded part extends to form the extension portion.

[0011] As an optional solution of the above-mentioned valve head assembly, the outer peripheral surface of the extension portion is provided with a groove, and the backwash filter is arranged in the groove.

[0012] As an optional solution of the above valve head assembly, the number of the flushing water inlet holes is set to at least two, and the at least two flushing water inlet holes are spaced apart along the circumference of the extension portion;

[0013] The backwash filter is cylindrical, or the number of the backwash filter is set to at least two, and each of the flushing water inlet holes is correspondingly provided with the backwash filter.

[0014] As an optional solution of the above-mentioned valve head assembly, a water inlet channel and a water outlet channel are formed in the valve head, and the extension portion is tubular and communicates with the inlet end of the water outlet channel.

[0015] As an optional solution of the above-mentioned valve head assembly, the outlet end of the water inlet channel is arranged around the circumference of the extension portion.

[0016] A backwash filter comprising:

[0017] A filter bottle, wherein the filter bottle is provided with a sewage outlet;

[0018] A sewage valve is provided at the sewage outlet;

[0019] A filter cartridge assembly is disposed in the filter bottle, and an annular gap is formed between the outer peripheral surface of the filter cartridge assembly and the inner wall of the filter bottle;

[0020] The valve head assembly is connected to the filter bottle, and the extension is nested with the filter cartridge assembly;

[0021] The filter cartridge assembly can move axially relative to the filter bottle so that the filter cartridge assembly blocks the backwash filter and opens the annular gap, or the filter cartridge assembly is staggered from the backwash filter and blocks the annular gap.

[0022] As an optional solution of the above-mentioned backwash filter, the filter cartridge assembly includes a filter frame and a filter screen, and the filter frame includes:

[0023] A skeleton body, wherein the skeleton body is cylindrical, and the filter screen is arranged on the outer peripheral surface of the skeleton body;

[0024] A switching portion is formed by extending from the open end of the skeleton body, and the switching portion can cover the backwash filter;

[0025] The shielding portion is protruded from the top end of the skeleton body along the circumference of the skeleton body, and the shielding portion can block the end of the annular gap.

[0026] As an optional solution of the above-mentioned backwash filter, a plurality of filter holes are provided on the skeleton body, and the filter holes are constructed as a shrinkage and pressurization structure.

[0027] As an optional solution of the above-mentioned backwash filter, the flow area of ​​the filter holes gradually decreases from the outside to the inside of the skeleton body.

[0028] As an optional solution of the above-mentioned backwash filter, the backwash filter further comprises a guide column arranged in the filter cartridge assembly, and a spiral structure is provided on the outer peripheral surface of the guide column.

[0029] As an optional solution to the above-mentioned backwash filter, the backwash filter also includes an elastic member, which is connected to the filter cartridge assembly. The elastic member is used to apply an elastic force to the filter cartridge assembly, and the elastic force is directed toward the valve head assembly along the axial direction of the filter bottle.

[0030] Beneficial effects of the utility model:

[0031] In the valve head assembly provided by the utility model, the backwash filter is integrally arranged on the extension part, so that the backwash filter and the valve head are an integrated structure. The two do not need to be assembled separately and can be disassembled and assembled as a whole at the same time, which is beneficial to reducing the number of parts of the backwash filter, thereby simplifying the overall assembly and improving assembly efficiency.

[0032] The backwash filter and the extension are fixed by plastic embedding, which has a compact structure and a firm fixing effect. No additional structure for fixing the backwash filter is required on the extension and the filter cartridge assembly, which is conducive to simplifying the structure, reducing processing difficulty, and thus reducing costs.

[0033] The backwash filter provided by the utility model adopts the above-mentioned valve head assembly, which can solve the problems of complex structure, low assembly efficiency and high cost caused by the backwash filter being prepared separately and then assembled. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a cross-sectional view of the backwash filter provided by the utility model during filtering function;

[0035] Figure 2 This is a cross-sectional view of the backwash filter provided by the utility model during the backwash function;

[0036] Figure 3 This is a cross-sectional view of the valve head assembly provided by the utility model;

[0037] Figure 4 This is a cross-sectional view of the insert provided by the utility model;

[0038] Figure 5 It is a cross-sectional view of the extension portion and the backwash filter provided by the utility model;

[0039] Figure 6 This is a cross-sectional view of the insert and filter frame provided by the utility model;

[0040] Figure 7 This is a cross-sectional view of a local structure of the filter skeleton provided by the present invention;

[0041] Figure 8 It is a structural schematic diagram of the guide column provided by the utility model.

[0042] In the picture:

[0043] 101. Water inlet; 102. Water outlet; 103. First water outlet; 104. Second water outlet; 11. Valve head; 111. Metal parts; 1111. Horizontal pipe; 1112. Vertical pipe; 112. Middle plastic-embedded part; 1121. Tank body; 113. End plastic-embedded part; 114. Extension part; 1141. Flushing water inlet hole; 12. Backwash filter; 200. Filter bottle; 201. Sewage outlet; 300. Filter cartridge assembly; 31. Filter frame; 311. Frame body; 3111. Filter hole; 312. Switching part; 313. Shielding part; 32. Filter screen; 400. Scraping assembly; 500. Elastic part; 600. Sewage valve; 700. Guide column; 701. Spiral groove. DETAILED DESCRIPTION

[0044] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0045] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0046] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0047] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0048] This embodiment provides a backwash filter that can be used as a pre-filter and has a backwash function so as to promptly flush impurities accumulated on the filter screen.

[0049] like Figure 1 and Figure 2 As shown, the backwash filter includes a valve head assembly, a filter bottle 200, a filter cartridge assembly 300, and a drain valve 600. The valve head assembly is connected to the filter bottle 200, and the filter cartridge assembly 300 is disposed within the filter bottle 200. The filter bottle 200 is provided with a drain port 201, and a drain valve 600 is provided at the drain port 201. The valve head assembly is used for water inlet and outlet. Water to be filtered enters the filter bottle 200 through the valve head assembly, is filtered in the forward direction by the filter cartridge assembly 300, and then flows out of the valve head assembly.

[0050] As the backwash filter is used for a longer time, impurities will accumulate on the surface of the filter cartridge assembly 300, affecting the filtering effect. To this end, the backwash filter also has the function of backwashing the filter cartridge assembly 300. When backwashing, the drain valve 600 opens, and water enters the filter bottle 200 through the valve head assembly, passes through the filter cartridge assembly 300 in the reverse direction, and is discharged through the drain port 201 on the filter bottle 200 and the drain valve 600, thereby achieving the function of flushing the filter cartridge assembly 300.

[0051] Specifically, a water inlet channel and a water outlet channel are formed in the valve head assembly, and one axial end of the filter bottle 200 is an open structure, which is used to connect the valve head assembly and communicate with the water inlet channel and the water outlet channel, thereby realizing the entry of raw water and the outflow of filtered water; a sewage outlet 201 is provided at the other axial end of the filter bottle 200, which is used to discharge the sewage generated during the backwashing process.

[0052] The filter cartridge assembly 300 is roughly cylindrical in structure. The axial direction of the filter cartridge assembly 300 is roughly parallel to the axis of the filter bottle 200 in the opposite direction. The outer peripheral surface of the filter cartridge assembly 300 is the filter inlet, and the outer peripheral surface of the filter cartridge assembly 300 is spaced apart from the inner wall of the filter bottle 200, forming an annular gap therebetween, which can be connected to the water inlet channel; one axial end of the filter cartridge assembly 300 is closed, and the other axial end serves as a filter outlet, which is connected to the water outlet channel.

[0053] When the backwash filter is working, the drain valve 600 is closed, the raw water enters the filter bottle 200 from the water inlet channel, and enters the annular gap, enters the filter cartridge assembly 300 along the radial direction of the filter cartridge assembly 300 to be filtered, and the filtered water flows out from the water outlet channel.

[0054] When the backwash filter is backwashing, the drain valve 600 is opened, water enters the filter bottle 200 from the water inlet channel, and directly enters the filter cartridge assembly 300, passes through the filter cartridge assembly 300 along the radial direction of the filter cartridge assembly 300 to flush the filter cartridge assembly 300, and the flushed sewage enters the annular gap, flows through the annular gap to the drain valve 600, and is discharged through the drain valve 600.

[0055] Since the water used to flush the filter cartridge assembly 300 is unfiltered water, in order to avoid bringing impurities into the filter cartridge assembly 300, the backwash filter also includes a backwash filter 12 to filter the incoming water during backwashing to prevent impurities from entering the filter cartridge assembly 300.

[0056] In the prior art, the backwash filter 12 is generally fixed to the filter cartridge assembly 300 by means of snaps or the like. Although it can filter the water used during backwashing, it increases the number of parts in the backwash filter and requires separate manufacturing and assembly. This also leads to a complex structure of the filter cartridge assembly 300, low assembly efficiency, and increased costs.

[0057] To solve the above problems, in this embodiment, the backwash filter 12 is integrated into the valve head assembly, so that the backwash filter 12 and the valve head assembly are an integrated structure, and there is no need to assemble the backwash filter 12 additionally, which is beneficial to reducing the number of parts of the backwash filter, improving assembly efficiency and reducing costs.

[0058] Specifically, if Figure 3 As shown, the valve head assembly includes a valve head 11 and a backwash filter 12, and a water inlet channel and a water outlet channel are formed in the valve head 11. The valve head 11 is connected to the filter bottle 200, and the outlet end of the water inlet channel is connected to the filter bottle 200; the outer wall of the valve head 11 is convexly provided with an extension portion 114, and the extension portion 114 is used to nest with the filter cartridge assembly 300 so that the water outlet channel is connected to the filter outlet of the filter cartridge assembly 300, and a flushing water inlet hole 1141 is provided on the extension portion 114, and the backwash filter 12 is integrally arranged on the extension portion 114 and covers the flushing water inlet hole 1141.

[0059] In this embodiment, the backwash filter 12 is fixed to the extension portion 114 by means of embedded molding, so that the backwash filter 12 and the valve head 11 are an integrated structure. The two do not need to be assembled separately and can be disassembled and assembled as a whole at the same time, which is beneficial to reducing the number of parts of the backwash filter, thereby simplifying the overall assembly and improving assembly efficiency; the backwash filter 12 and the extension portion 114 are fixed by means of embedded molding, which has a compact structure and a firm fixing effect. There is no need to add an additional structure for fixing the backwash filter 12 on the extension portion 114 and the filter cartridge assembly 300, which is beneficial to simplifying the structure, reducing processing difficulty, and thus reducing costs.

[0060] like Figure 3 As shown, the valve head 11 is provided with a water inlet 101, a first water outlet 103, a second water outlet 104, and a water outlet 102. The water inlet 101 and the first water outlet 103 are connected through an inlet channel. That is, the water inlet 101 is the inlet end of the inlet channel, the first water outlet 103 is the outlet end of the inlet channel, and the first water outlet 103 is connected to the interior of the filter bottle 200. The second water outlet 104 and the water outlet 102 are connected through an outlet channel. That is, the second water outlet 104 is the inlet end of the outlet channel, and the water outlet 102 is the outlet end of the outlet channel. Optionally, an extension 114 is tubular and connected to the second water outlet 104. That is, the extension 114 is provided around the second water outlet 104 and extends into the filter bottle 200 to cooperate with the filter cartridge assembly 300 and connect the interior of the filter cartridge assembly 300 with the water outlet channel.

[0061] In some embodiments, the valve head 11 is generally T-shaped, comprising a horizontal portion and a vertical portion. The horizontal portion is provided with a water inlet 101 and a water outlet 102 at each end, respectively. One end of the vertical portion communicates with the middle portion of the horizontal portion, and the other end of the vertical portion is used to connect the filter bottle 200 and the filter cartridge assembly 300. This arrangement allows the pipes connecting the water inlet 101, the pipes connecting the water outlet 102, and the filter bottle 200 to be separately arranged, thus avoiding structural interference.

[0062] In some embodiments, the valve head 11 includes an insert and a metal member 111 that is sleeved around the insert. The insert forms a water inlet and outlet channel, and the insert is integrally formed with an extension 114. The provision of the metal member 111 protects the insert, improving the overall strength of the valve head 11 and preventing damage during installation or transportation, thereby extending the service life of the valve head 11. The provision of the insert and the extension 114 further enhance the connection strength and stability between the insert and the metal member 111, and the material of the insert makes it easier to secure the backwash filter 12.

[0063] In addition, by providing an embedded molded part, water and the metal part 111 can be separated to prevent heavy metals precipitated from the metal part 111 from entering the water, thereby ensuring healthy drinking water.

[0064] Optionally, the metal member 111 may be made of copper or a copper alloy to reduce costs.

[0065] In some embodiments, the metal part 111 includes a horizontal tube 1111 and a vertical tube 1112. The middle of the outer peripheral surface of the horizontal tube 1111 is connected to the vertical tube 1112. The vertical tube 1112 is used to be detachably connected to the filter bottle 200 to facilitate maintenance and replacement of the structure inside the filter bottle 200.

[0066] Optionally, the standpipe 1112 and the filter bottle 200 can be fixed by threading. For example, the inner wall of the standpipe 1112 is provided with an internal thread, and the outer wall of the filter bottle 200 is provided with an external thread. The standpipe 1112 is sleeved outside the filter bottle 200 and is locked and fixed by the internal and external threads.

[0067] In some embodiments, as Figure 4 As shown, the molded insert includes a middle molded portion 112 and two end molded portions 113. The end molded portions 113 are located within the transverse tube 1111. The middle molded portion 112 is connected to an end molded portion 113 at each end. The middle molded portion extends from the transverse tube 1111 into the vertical tube 1112, forming an extension portion 114. By dividing the molded insert into the middle molded portion 112 and the two end molded portions 113, the difficulty of processing can be reduced, thereby reducing costs.

[0068] In order to improve the connection firmness between the metal part 111 and the insert molded part, in some embodiments, a protrusion is provided on one of the outer wall of the insert molded part and the inner wall of the metal body, so that after insert molding, a groove body 1121 is provided on the other of the outer wall of the insert molded part and the inner wall of the metal body. Through the cooperation between the protrusion and the groove body 1121, the contact area is increased and the firmness of the fixed connection is improved.

[0069] In some embodiments, a groove is provided on the outer peripheral surface of the extension portion 114, and the backwash filter 12 is provided in the groove, which increases the contact area between the backwash filter 12 and the extension portion 114, improves the fixing effect, and helps to reduce the thickness of the extension portion 114, avoiding protrusions on the surface of the extension portion 114, so as to facilitate the cooperation between the extension portion 114 and the filter cartridge assembly 300.

[0070] In some embodiments, as Figure 5 As shown, the number of flushing water inlet holes 1141 is set to at least two, and at least two flushing water inlet holes 1141 are arranged at intervals along the circumference of the extension portion 114. The backwash filter 12 is cylindrical, and the backwash filter 12 is sleeved on the outside of the extension portion 114 to correspond to all the flushing water inlet holes 1141.

[0071] In some embodiments, the number of flushing water inlet holes 1141 is set to at least two, and at least two flushing water inlet holes 1141 are arranged at circumferential intervals along the extension portion 114. The number of backwashing filters 12 is set to at least two, so that each flushing water inlet hole 1141 is correspondingly provided with a backwashing filter 12.

[0072] In some embodiments, the outlet end of the water inlet channel is arranged circumferentially around the extension portion 114, that is, the first water outlet 103 is arranged circumferentially around the extension portion 114, so that the first water outlet 103 and the second water outlet 104 are more compact, which is beneficial to ensure that the second water outlet 104 is located in the center of the filter bottle 200, facilitating the cooperation between the valve head 11 and the filter bottle 200 and the cooperation between the extension portion 114 and the filter cartridge assembly 300.

[0073] Combine Figure 1 、 Figure 2 and Figure 6 As shown, in this embodiment, the switching of the water flow path in the filter bottle 200 is achieved by the axial movement of the filter cartridge assembly 300 in the filter bottle 200. That is, the normal filtering function of the backwash filter and the switching of the backwash function are achieved through the axial movement of the filter cartridge assembly 300.

[0074] Combine Figure 1 and Figure 2 As shown, after the filter cartridge assembly 300 moves axially in the filter bottle 200 toward the valve head assembly to the first position, the filter cartridge assembly 300 can block the backwash filter 12, blocking the water entering the filter bottle 200 from the water inlet channel from directly entering the filter cartridge assembly 300, and can keep the water inlet channel and the annular gap in communication, so that the water to be filtered can enter the annular gap, and then enter the valve head assembly and flow out after being filtered, thereby achieving normal filtering function; the filter cartridge assembly 300 Component 300 can also move axially away from the valve head assembly to a second position. At this time, the filter cartridge assembly 300 is staggered with the backwash filter 12, and the connection between the water inlet channel and the annular gap is cut off, so that the backwash filter 12 and the flushing water inlet hole 1141 are exposed. After the water in the water inlet channel enters the filter bottle 200, it can only enter the filter cartridge assembly 300 through the backwash filter 12 and the flushing water inlet hole 1141. After flushing the filter cartridge assembly 300, it is discharged by the drain valve 600 to realize the backwash function.

[0075] In some embodiments, the filter cartridge assembly 300 includes a filter skeleton 31 and a filter screen 32. The filter skeleton 31 includes a skeleton body 311, a switching portion 312 and a shielding portion 313. The skeleton body 311 is cylindrical, and the filter screen 32 is arranged on the outer peripheral surface of the skeleton body 311; the switching portion 312 is formed by extending from the open end of the skeleton body 311, and the switching portion 312 can shield the backwash screen 12 or be staggered with the backwash screen 12; the shielding portion 313 is protruded along the circumference of the skeleton body 311 at the top of the skeleton body 311, and the shielding portion 313 can block the end of the annular gap.

[0076] When the filter cartridge assembly 300 moves to the second position along the axial direction of the filter bottle 200 in the direction away from the valve head assembly, the blocking portion 313 blocks the end of the annular gap facing the valve head assembly, thereby blocking the connection between the water inlet passage and the annular gap. At the same time, the switching portion 312 is away from the valve head assembly and can be staggered with the backwash filter 12, thereby opening the flushing water inlet hole 1141 to achieve the flushing function.

[0077] When the filter cartridge assembly 300 moves to the first position along the axial direction of the filter bottle 200 toward the valve head assembly, the blocking portion 313 moves away from the annular gap, so that the annular gap is connected to the water inlet passage; at the same time, the switching portion 312 is close to the valve head assembly, which can block the backwash filter 12, thereby closing the flushing water inlet hole 1141 to achieve the filtering function.

[0078] To improve the backwashing effect, in some embodiments, as Figure 7 As shown, a plurality of filter holes 3111 are provided on the skeleton body 311 , and the filter holes 3111 are constructed as a shrinking and pressurizing structure to increase the water flow rate during backwashing.

[0079] Optionally, the flow area of ​​the filter hole 3111 gradually decreases from the outside to the inside of the skeleton body 311 to form a shrinking and pressurizing structure, thereby increasing the flow rate of water flowing through the filter hole 3111 during backwashing and improving the flushing effect of the filter screen 32.

[0080] Exemplarily, the filter hole 3111 may be a tapered hole.

[0081] In some embodiments, such as Figure 8 As shown, the backwash filter also includes a guide column 700 arranged in the filter cartridge assembly 300. A spiral structure is provided on the outer peripheral surface of the guide column 700. The spiral structure can guide the spiral flow of water entering the filter cartridge assembly 300, accelerate the water flow rate, and thus enhance the flushing effect.

[0082] Alternatively, the spiral structure may be a spiral groove 701 extending in a spiral direction, or a spiral ridge extending in a spiral direction. In some embodiments, the backwash filter further comprises a scraping assembly 400, which is disposed within the filter bottle 200 and sleeved onto the outside of the filter cartridge assembly 300. The scraping assembly 400 is configured to scrape the outer circumference of the filter cartridge assembly 300 when the filter cartridge assembly 300 moves axially, thereby improving the cleaning effect of the filter cartridge assembly 300.

[0083] Specifically, the scraping assembly 400 includes a scraping frame and a scraping piece. The scraping frame is fixedly arranged in the filter bottle 200, and an annular gap is formed between the scraping frame and the filter cartridge assembly 300. The shielding portion 313 can abut against one end face of the scraping frame facing the valve head assembly to seal the annular gap; the scraping piece is arranged on the scraping frame and abuts against the outer peripheral surface of the filter cartridge assembly 300.

[0084] In some embodiments, the backwash filter further includes an elastic member 500, which is disposed within the filter bottle 200 and connected to the filter cartridge assembly 300, and is configured to drive the filter cartridge assembly 300 to move axially along the filter bottle 200 toward the valve head assembly. In other words, the elastic force exerted by the elastic member 500 on the filter cartridge assembly 300 is directed axially toward the valve head assembly along the filter bottle 200, thereby applying an elastic restoring force to the filter cartridge assembly 300 to return it to the first position.

[0085] In order to enable the filter cartridge assembly 300 to move axially, the sewage outlet 201 and the valve head assembly are arranged at opposite ends of the filter bottle 200, so that the flow of water can be used as the driving force for the axial movement of the filter cartridge assembly 300.

[0086] It can be understood that the water inlet 101 of the backwash filter is always connected to the water source, and the water outlet 102 of the backwash filter is connected to the water-using equipment (such as a faucet). Only when the water-using equipment uses water, the water outlet 102 is connected to the outside to realize water supply; the drain valve 600 is only opened during the flushing process and is in a normally closed state at other times.

[0087] When flushing is required, the water outlet 102 of the valve head assembly is closed and connected to the outside, and the filter bottle 200 is filled with water. After the drain valve 600 is opened, the drain port 201 is connected to the outside. Under the pressure of the water, the water in the bottle will be discharged through the drain port 201, creating a negative pressure at the end of the filter bottle 200 near the drain port 201. Under the action of this negative pressure, water will flow from the valve head assembly to the end of the filter bottle 200 where the drain port 201 is located. Under the action of the water flow, the filter cartridge assembly 300 will move along the axial direction of the filter bottle 200, away from the valve head assembly, and thus move to the second position, switching the backwash filter to the backwash state.

[0088] In some embodiments, a base is also provided in the filter bottle 200, and the filter cartridge assembly 300 and the guide column 700 are fixed on the base. The base is slidably matched with the scraping frame, and a through hole is provided on the base to connect the annular gap and the sewage outlet 201.

[0089] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A valve head assembly for backwashing a filter, characterized in that: The valve head assembly includes: A valve head (11), wherein an outer wall of the valve head (11) is provided with an extension portion (114), and a flushing water inlet hole (1141) is provided on the extension portion (114); The backwash filter (12) is integrally provided on the extension portion (114) and covers the flushing water inlet hole (1141).

2. The valve head assembly according to claim 1, characterized in that The backwash filter (12) is embedded in the extension portion (114).

3. The valve head assembly according to claim 2, characterized in that: The valve head (11) comprises an insert molded part and a metal part (111) sleeved outside the insert molded part, and the insert molded part is extended to form the extension part (114).

4. The valve head assembly according to claim 1, characterized in that The outer peripheral surface of the extension portion (114) is provided with a groove, and the backwash filter (12) is arranged in the groove.

5. The valve head assembly according to any one of claims 1 to 4, characterized in that: The number of the flushing water inlet holes (1141) is set to at least two, and the at least two flushing water inlet holes (1141) are arranged at intervals along the circumference of the extension portion (114); The backwash filter (12) is cylindrical, or the number of the backwash filter (12) is set to at least two, and each of the flushing water inlet holes (1141) is correspondingly provided with the backwash filter (12).

6. The valve head assembly according to any one of claims 1 to 4, characterized in that: A water inlet channel and a water outlet channel are formed in the valve head (11); the extension portion (114) is tubular, and the extension portion (114) is in communication with the inlet end of the water outlet channel.

7. The valve head assembly according to claim 6, characterized in that: The outlet end of the water inlet channel is arranged around the circumference of the extension portion (114).

8. A backwash filter, characterized in that: include: A filter bottle (200), wherein the filter bottle (200) is provided with a sewage outlet (201); A sewage valve (600) is provided at the sewage outlet (201); A filter cartridge assembly (300) is disposed in the filter bottle (200), and an annular gap is formed between the outer peripheral surface of the filter cartridge assembly (300) and the inner wall of the filter bottle (200); The valve head assembly according to any one of claims 1 to 7, wherein the valve head (11) is connected to the filter bottle (200), and the extension portion (114) is nested with the filter cartridge assembly (300); The filter cartridge assembly (300) can move axially relative to the filter bottle (200) so that the filter cartridge assembly (300) blocks the backwash filter (12) and opens the annular gap, or the filter cartridge assembly (300) is staggered with the backwash filter (12) and blocks the annular gap.

9. The backwash filter according to claim 8, characterized in that The filter cartridge assembly (300) comprises a filter frame (31) and a filter screen (32), wherein the filter frame (31) comprises: A skeleton body (311), wherein the skeleton body (311) is cylindrical, and the filter screen (32) is arranged on the outer peripheral surface of the skeleton body (311); A switching portion (312) is formed by extending from the open end of the skeleton body (311), and the switching portion (312) can shield the backwash filter (12); The shielding portion (313) is protrudingly provided on the top end of the skeleton body (311) along the circumference of the skeleton body (311), and the shielding portion (313) can block the end of the annular gap.

10. The backwash filter according to claim 9, characterized in that The skeleton body (311) is provided with a plurality of filter holes (3111), and the filter holes (3111) are constructed as a shrinkage and pressurization structure.

11. The backwash filter according to claim 10, characterized in that The flow area of ​​the filter hole (3111) gradually decreases from the outside to the inside of the skeleton body (311) to form the shrinkage and pressurization structure.

12. The backwash filter according to any one of claims 8 to 11, characterized in that: The backwash filter further comprises a guide column (700) arranged in the filter cartridge assembly (300), and a spiral structure is provided on the outer peripheral surface of the guide column (700).

13. The backwash filter according to any one of claims 8 to 11, characterized in that: The backwash filter further comprises an elastic member (500), the elastic member (500) being connected to the filter cartridge assembly (300), the elastic member (500) being used to apply an elastic force to the filter cartridge assembly (300), the elastic force being directed toward the valve head assembly along the axial direction of the filter bottle (200).

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