Filter

Abstract

The utility model belongs to the technical field of fluid pipeline systems, and discloses a filter. The filter comprises a valve body, a filter screen, a valve cover and a pollution discharge assembly, an overflowing cavity and a filtering cavity which are communicated with each other are formed in the valve body, the filter screen extends into the overflowing cavity from the filtering cavity, the valve body is provided with a port communicating the filtering cavity with the outside, the valve cover is detachably connected to the port, and the pollution discharge assembly comprises a valve seat, a valve rod, a valve clack and a linkage structure. The valve seat is arranged in the filter cavity and located at the end, close to the valve deck, of the filter screen, a dirt storage bin is formed between the valve seat and the valve deck, a dirt discharging hole communicated with the dirt storage bin is formed in the valve seat, one end of the valve rod extends into the filter screen and is connected with the valve clack through a linkage structure, and the other end of the valve rod extends out of the valve deck. The valve rod can drive the valve clack to turn over relative to the valve seat through the linkage structure so that the valve clack can seal or open the drainage hole. The filter provided by the utility model can realize on-line decontamination, is convenient and quick to use, and is not limited in mounting direction.

Description

A filter Technical Field

[0001] This utility model relates to the field of fluid pipeline system technology, and in particular to a filter. Background Technology

[0002] Filters are an indispensable device in fluid media transportation pipelines. They are usually installed at the inlet of pressure reducing valves, pressure relief valves, level control valves, or other equipment to filter solid impurities in the water inside the pipeline, preventing impurities from clogging the pipeline or causing scale buildup, thus ensuring the normal operation of valves and equipment.

[0003] As shown in Figure 1, the existing filter mainly includes a valve body 10, a filter screen 20, and a valve cover 30. The filter screen 20 is installed inside the valve body 10, and the valve cover 30 is used to seal the filter screen 20 inside the valve body 10. The disadvantages of the existing filter are: First, when cleaning solid impurities inside the filter screen 20, the valve cover 30 needs to be opened, and the medium will flow everywhere, even splashing onto the workers. Therefore, it is impossible to clean online. The medium flow in the pipeline can only be stopped during cleaning, and then the valve cover 30 can be removed for cleaning. The operation is cumbersome, and the pipeline cannot operate continuously, resulting in inconvenience. Second, in order to make solid impurities accumulate at the valve cover 30 under the action of gravity for easy cleaning, the installation direction of the filter is limited. During installation, the filter screen 20 can only face downwards.

[0004] Therefore, there is an urgent need to provide a filter to solve the above problems. Summary of the Invention

[0005] The purpose of this utility model is to provide a filter that can achieve online cleaning, is convenient and quick to use, and is not restricted in its installation direction.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A filter includes a valve body, a filter screen, and a valve cover. The valve body has a flow chamber and a filter chamber that are connected to each other. The filter screen extends from the filter chamber into the flow chamber. The valve body has a port that connects the filter chamber to the outside. The valve cover is detachably connected to the port.

[0008] It also includes a sewage discharge assembly, which includes a valve seat, a valve stem, a valve disc, and a linkage structure. The valve seat is located inside the filter chamber and at one end of the filter screen near the valve cover. A sewage storage chamber is formed between the valve seat and the valve cover. The valve seat has a sewage discharge hole communicating with the sewage storage chamber. One end of the valve stem extends into the filter screen and is connected to the valve disc through the linkage structure. The other end extends outside the valve cover. The valve stem can drive the valve disc to flip relative to the valve seat through the linkage structure, so that the valve disc seals or opens the sewage discharge hole.

[0009] As an optional solution, the valve seat has a cylindrical structure.

[0010] As an optional solution, the valve seat is provided with two semi-circular drain holes, which are symmetrical about the diameter of the valve seat. The valve discs are semi-circular and there are two of them. The two valve discs are arranged in a one-to-one correspondence with the two drain holes. The valve stem can drive the two valve discs to flip relative to the valve seat simultaneously through the linkage structure.

[0011] As an optional solution, the linkage structure includes a sleeve and two connecting rods. The sleeve is fitted onto the valve stem, and the two connecting rods are symmetrically arranged on opposite sides of the sleeve and correspond one-to-one with the valve discs. One end of each connecting rod is rotatably connected to the sleeve, and the other end is rotatably connected to the valve disc.

[0012] As an alternative, the valve stem is axially positioned on the valve cover or the valve seat and is rotatable relative to the valve cover or the valve seat, and the sleeve is threaded onto the valve stem and is movable along the valve stem.

[0013] As an optional solution, a limiting cover is also included. A limiting boss is formed on the outer side wall of the valve stem, and a limiting groove is formed on the end face of the valve seat. The valve stem passes through the valve seat and the limiting boss is accommodated in the limiting groove. The limiting cover is fitted onto the valve stem and fixedly connected to the valve seat. The limiting cover abuts against the limiting boss.

[0014] As an alternative, the sewage discharge assembly also includes a handwheel connected to the end of the valve stem located outside the valve cover.

[0015] As an alternative, the valve stem is threadedly connected to the valve cover or the valve seat, and the valve stem is fixedly connected to the sleeve.

[0016] As an optional solution, a nut and a handwheel are also included. The nut is threaded onto one end of the valve stem located outside the valve cover. The handwheel is axially positioned outside the valve cover and fixedly fitted onto the nut. The valve stem is fixedly connected to the sleeve.

[0017] As an alternative, the valve disc is rotatably connected to the valve seat via a connecting pin.

[0018] As an alternative, a torsion spring is fitted onto the connecting pin. The torsion spring has two free ends, one of which abuts against the bottom of one of the valve discs, and the other of which abuts against the bottom of the other valve disc.

[0019] The beneficial effects of this utility model are:

[0020] This utility model provides a filter.

[0021] This utility model provides a filter. During normal use, the valve disc is in the open drain position. The sludge storage chamber is connected to the inside of the filter screen through the drain hole. The medium flows through the filter screen for filtration. The filtered solid impurities remain inside the filter screen and, under the action of fluid and pipeline pressure, float in the sludge storage chamber through the drain hole. When decontamination is required, the valve stem drives the valve disc to flip relative to the valve seat through a linkage mechanism, causing the valve disc to rotate to the position of sealing the drain hole, cutting off the connection between the sludge storage chamber and the medium inside the filter screen. This allows solid impurities to accumulate in the sludge storage chamber, preventing the medium from splashing onto the workers during decontamination. Then, the valve cover is removed, and the solid impurities in the sludge storage chamber are cleaned, achieving direct online decontamination. After completion, the valve cover is fixed back in place, and then the valve stem is driven again through the linkage mechanism to flip the valve disc back to the open drain position.

[0022] Therefore, the filter provided by this utility model can achieve online cleaning without water interruption or pressure cutoff. It is simple, convenient, and efficient to operate. It avoids the backflow of fluid due to pipeline pressure cutoff, which would bring solid impurities back into the pipeline, resulting in incomplete or ineffective cleaning. At the same time, it can ensure the normal and continuous operation of the pipeline, avoiding economic losses caused by system water interruption or pressure cutoff. In addition, since the impurities are concentrated in the sludge storage bin, the filter is not affected by the opening orientation of the filter screen, so the filter can be installed in any direction. Attached Figure Description

[0023] Figure 1 is a cross-sectional view of a filter provided by the prior art;

[0024] Figure 2 is a cross-sectional view of the valve body provided in an embodiment of the present invention;

[0025] Figure 3 is a cross-sectional view of the filter provided in an embodiment of the present invention;

[0026] Figure 4 is a schematic diagram of the sewage discharge component provided in this embodiment of the present invention when it is opened;

[0027] Figure 5 is a schematic diagram of the sewage discharge component provided in the embodiment of this utility model when it is closed;

[0028] Figure 6 is a magnified view of part A in Figure 3.

[0029] In the picture:

[0030] 10. Valve body; 20. Filter screen; 30. Valve cover;

[0031] 1. Valve body; 11. Flow chamber; 111. Inlet channel; 112. Outlet channel; 12. Filter chamber;

[0032] 2. Filter screen;

[0033] 3. Valve cover;

[0034] 4. Sewage discharge assembly; 41. Valve seat; 411. Sewage storage bin; 412. Sewage discharge hole; 413. Limiting groove; 414. First lug; 42. Valve stem; 421. Limiting boss; 43. Valve disc; 431. Second lug; 44. Linkage structure; 441. Sleeve; 442. Connecting rod; 443. Pin; 45. Connecting pin; 46. Torsion spring; 461. Free end; 47. Handwheel;

[0035] 5. Limiting cover; 6. First sealing ring; 7. Second sealing ring. Detailed Implementation

[0036] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0037] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0038] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0039] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0040] As shown in Figures 2 and 3, this embodiment provides a filter, including a valve body 1, a filter screen 2, and a valve cover 3. The valve body 1 has a connected flow chamber 11 and a filter chamber 12. In Figure 2, the dashed line is the boundary between the flow chamber 11 and the filter chamber 12; the upper part of the dashed line is the filter chamber 12, and the lower part is the flow chamber 11. The filter screen 2 is cylindrical and extends from the filter chamber 12 into the flow chamber 11. That is, a portion of the filter screen 2 is located in the filter chamber 12, and another portion is located in the flow chamber 11, dividing the flow chamber 11 into an inlet channel 111 on one side and an outlet channel 112 on the other side. The port of the filter screen 2 faces the inlet channel 111. The valve body 1 has a port connecting the filter chamber 12 to the outside, and the valve cover 3 is detachably connected to this port. In use, as shown by the arrow in Figure 2, the medium flows into the filter screen 2 from the inlet channel 111 for filtration, and then flows out from the outlet channel 112. The filtered impurities remain inside the filter screen 2, preventing impurities from clogging the pipe or forming scale inside the pipe, thus ensuring the normal use of the valve equipment.

[0041] Furthermore, referring to Figures 3 to 5, the filter also includes a drain assembly 4, which includes a valve seat 41, a valve stem 42, a valve disc 43, and a linkage structure 44. The valve seat 41 is located inside the filter chamber 12 and at one end of the filter screen 2 near the valve cover 3. A sludge storage chamber 411 is formed between the valve seat 41 and the valve cover 3. The valve seat 41 is provided with a drain hole 412 that communicates with the sludge storage chamber 411. One end of the valve stem 42 extends into the filter screen 2 and is connected to the valve disc 43 through the linkage structure 44. The other end extends outside the valve cover 3. The valve stem 42 can drive the valve disc 43 to flip relative to the valve seat 41 through the linkage structure 44 so that the valve disc 43 seals or opens the drain hole 412.

[0042] As shown in Figures 3 and 4, during normal use, valve disc 43 is in the position where the drain hole 412 is open. The sludge storage chamber 411 is connected to the inside of the filter screen 2 through the drain hole 412. The medium flows through the filter screen 2 for filtration. The filtered solid impurities remain inside the filter screen 2 and, under the action of fluid and pipeline pressure, float in the sludge storage chamber 411 through the drain hole 412. As shown in Figure 5, when decontamination is required, valve stem 42 drives valve disc 43 to flip upward relative to valve seat 41 through linkage structure 44, so that valve disc 43 rotates to the position of sealing drain hole 412, cutting off the connection between sludge storage chamber 411 and the medium inside the filter screen 2. This causes solid impurities to accumulate in sludge storage chamber 411, preventing the medium from splashing onto the workers during decontamination. Then, valve cover 3 is removed, and the solid impurities in sludge storage chamber 411 are cleaned to achieve direct online decontamination. After completion, valve cover 3 is fixed back in place, and then valve stem 42 is driven to flip valve disc 43 downward to the position of opening drain hole 412 through linkage structure 44.

[0043] Therefore, the filter provided in this embodiment can achieve online cleaning without water outage or pressure interruption. It is simple, convenient, and efficient to operate, avoiding the backflow of solid impurities into the pipeline due to pressure interruption, which would cause incomplete or ineffective cleaning. At the same time, it can ensure the normal and continuous operation of the pipeline, avoiding economic losses caused by system water outage or pressure interruption. In addition, since the impurities are concentrated in the sludge storage bin 411, they are not affected by the opening orientation of the filter screen 2, so the filter can be installed in any orientation.

[0044] As shown in Figure 3, since the valve stem 42 passes through the valve seat 41 and the valve cover 3 in sequence, in order to prevent leakage, a first sealing ring 6 is provided between the valve stem 42 and the valve cover 3, and a second sealing ring 7 is provided between the valve stem 42 and the valve seat 41, so as to ensure the sealing performance between the valve stem 42, the valve seat 41 and the valve cover 3.

[0045] In this embodiment, to facilitate the disassembly and assembly of the valve cover 3 and ensure a good sealing effect, the valve cover 3 is fixed to the port connecting the filter chamber 12 to the outside using multiple bolts and nuts. In other optional embodiments, the valve cover 3 can also be fixed to the port connecting the filter chamber 12 to the outside using a threaded connection.

[0046] In this embodiment, as shown in FIG2, the filter chamber 12 is inclined relative to the flow chamber 11, that is, the filter is a Y-shaped filter. In other optional embodiments, the filter chamber 12 may also be arranged perpendicular to the flow chamber 11, that is, the filter is a T-shaped filter.

[0047] In this embodiment, as shown in Figures 3 and 4, the valve seat 41 has a cylindrical structure that extends axially to the valve cover 3. That is, the valve seat 41 has a built-in sludge storage chamber 411 with a certain volume, capable of storing filtered impurities in the pipeline for easy cleaning. In another optional embodiment, the valve seat 41 can also be a plate-like structure, with the valve seat 41, valve cover 3, and the inner wall of the filter chamber 12 together forming a closed sludge storage chamber 411.

[0048] It should be noted that the inner wall of the valve body 1 is provided with a first step. After the filter screen 2 extends into the flow chamber 11, its bottom end abuts against the first step for limitation. The inner wall of the port of the filter chamber 12 is provided with a second step. The valve seat 41 seals against the second step and is locked by multiple screws. The top of the filter screen 2 abuts against the bottom of the valve seat 41, and the valve seat 41 can seal the filter screen 2 inside the filter chamber 12.

[0049] In this embodiment, as shown in Figure 4, the bottom of the valve seat 41 is provided with two semi-circular drain holes 412. The two drain holes 412 are symmetrical about the diameter of the valve seat 41. The valve discs 43 are semi-circular and there are two of them. The two valve discs 43 are arranged one-to-one with the two drain holes 412. The valve stem 42 can drive the two valve discs 43 to flip relative to the valve seat 41 simultaneously through the linkage structure 44. This allows the bottom of the valve seat 41 to have a sufficiently large drain hole 412 to ensure that the filtered impurities can fully enter the sludge storage chamber 411 under the pressure of the pipeline and the force of the fluid, resulting in more thorough sludge removal.

[0050] It should be noted that, as shown in Figure 4, the "semicircle" here is not a semicircle in the strict sense. It actually refers to a fan-shaped ring formed by cutting off a very small semicircle from the center of the original semicircle. Since the area of ​​the cut-off semicircle is very small, it can be ignored. Of course, in other embodiments, the "semicircle" here can also be set to a semicircle in the strict sense.

[0051] Furthermore, as shown in Figure 4, the valve disc 43 is rotatably connected to the valve seat 41 via a connecting pin 45. This allows the valve disc 43 to rotate about the connecting pin 45 as a pivot point when opening or closing, ensuring the stability of the valve disc 43's rotation.

[0052] Specifically, as shown in Figure 5, in this embodiment, two connecting pins 45 are provided. These two connecting pins 45 are symmetrically distributed on opposite sides of the valve stem 42 and located between the two valve discs 43. A first lug 414 protrudes from the bottom of the valve seat 41, and a second lug 431 protrudes from the straight edge of each valve disc 43. Each connecting pin 45 passes horizontally through both the first lug 414 and the second lug 431 of the two valve discs 43. Each connecting pin 45 engages with both first lugs 414, and the connecting pin 45 is positioned between the two first lugs 414, forming a stable support effect. This arrangement allows the two valve discs 43 to share the same connecting pin 45 and rotate around it, saving space and reducing the number of components. Furthermore, the two connecting pins 45 extend along one of the diameters of the valve seat 41, meaning that the two valve discs 43 can rotate around one of the diameters of the valve seat 41.

[0053] Furthermore, as shown in Figure 5, a torsion spring 46 is fitted onto each connecting pin 45. The torsion spring 46 has two free ends 461, one of which abuts against the bottom of one valve disc 43, and the other free end 461 abuts against the bottom of the other valve disc 43. The torsion spring 46 can apply a force to the valve disc 43 in the direction of closing the drain hole 412, so that the valve disc 43 can rotate smoothly relative to the valve seat 41 when opening and closing.

[0054] Further, as shown in Figures 4 and 5, the linkage structure 44 includes a sleeve 441 and two connecting rods 442. The sleeve 441 is fitted onto the valve stem 42. The two connecting rods 442 are symmetrically arranged on opposite sides of the sleeve 441 and correspond one-to-one with the valve discs 43. One end of the connecting rod 442 is rotatably connected to the sleeve 441, and the other end is rotatably connected to the valve disc 43. Specifically, hinge seats are protruding at the bottom center of the two valve discs 43 and on opposite sides of the sleeve 441. One end of the connecting rod 442 is connected to the hinge seat at the bottom of the valve disc 43 through a pin 443, and the other end of the connecting rod 442 is connected to the hinge seat of the sleeve 441 through a pin 443. The horizontal line connecting the two connecting rods 442 is perpendicular to the extension direction of the connecting shaft.

[0055] The valve stem 42 drives the sleeve 441 to move axially. The sleeve 441 drives the two valve discs 43 to rotate synchronously via two connecting rods 442, ensuring the synchronicity and stability of the movement of the two valve discs 43. When cleaning is required, the valve stem 42 drives the sleeve 441 to move upward. During the upward movement of the sleeve 441, the two connecting rods 442 drive the two valve discs 43 to flip upward synchronously, so that each valve disc 43 closes the corresponding drain hole 412, realizing online cleaning. After completion, the valve stem 42 drives the sleeve 441 to move downward. During the downward movement of the sleeve 441, the two connecting rods 442 drive the two valve stems 42 to flip downward synchronously, so that each valve disc 43 opens the corresponding drain hole 412.

[0056] In this embodiment, to enable the sleeve 441 to move up and down, the valve stem 42 is axially positioned on the valve seat 41 and can rotate relative to the valve seat 41. The sleeve 441 is threaded onto the valve stem 42 and can move along the valve stem 42. That is, in this embodiment, the valve stem 42 can only rotate and cannot move axially. By rotating the valve stem 42, the sleeve 441 moves up and down along the thread of the valve stem 42, and the connecting rod 442 drives the valve disc 43 to switch between the open position and the sealed position, which is convenient to operate. The valve stem 42 and the valve cover are in a sealing fit.

[0057] As shown in Figure 3, the sewage discharge assembly 4 also includes a handwheel 47, which is connected to the end of the valve stem 42 located outside the valve cover 3. By rotating the handwheel 47, the valve stem 42 can be driven to rotate, thereby driving the sleeve 441 to move up and down along the valve stem 42, which is convenient to operate and saves time and effort.

[0058] In this embodiment, the end of the valve stem 42 is configured as a quadrilateral structure, and the handwheel 47 has a quadrilateral hole in its center. The handwheel 47 is fitted onto the quadrilateral structure at the end of the valve stem 42 through the quadrilateral hole, thereby forming a circumferential rotation limiting connection. When the handwheel 47 is rotated, the handwheel 47 can drive the valve stem 42 to rotate together. In other optional embodiments, the fit between the valve stem 42 and the handwheel 47 can also adopt other shapes that can form a circumferential rotation limiting connection, such as triangles or pentagons, and no specific limitation is made here.

[0059] Specifically, as shown in Figure 6, in this embodiment, in order to axially position the valve stem 42 within the valve seat 41, the filter also includes a limiting cover 5. A limiting boss 421 is protruding from the outer wall of the valve stem 42, and a limiting groove 413 is formed on the end face of the valve seat 41. The valve stem 42 passes through the valve seat 41, and the limiting boss 421 is accommodated within the limiting groove 413. The limiting cover 5 is fitted onto the valve stem 42 and fixedly connected to the valve seat 41 by multiple screws, with the limiting cover 5 pressing against the limiting boss 421. By restricting the limiting boss 421 with the limiting cover 5, the valve stem 42 can only rotate and cannot move axially. During decontamination, it is only necessary to first remove the handwheel 47, then remove the valve cover 3, which will allow the valve cover 3 to detach from the valve stem 42. Then, the solid impurities in the sludge storage bin 411 can be cleaned, achieving direct online decontamination.

[0060] In another alternative embodiment, the valve stem 42 can be axially fixedly connected to the valve cover 3, while the valve stem 42 and valve seat 41 are only sealed together. Specifically, the upper surface of the valve cover 3 has a limiting groove 413 similar to the one described above. The limiting boss 421 on the valve stem 42 is replaced by a retaining ring fitted around the valve stem 42. A groove for limiting the retaining ring is formed on the side wall of the valve stem 42. The retaining ring is simultaneously accommodated in the limiting groove 413 and the groove. The limiting cover 5 is fitted around the valve stem 42 and fixedly connected to the outer end face of the valve cover 3 by multiple screws. The limiting cover 5 presses against the retaining ring, thus achieving the purpose of the valve stem 42 rotating but not moving axially. In this way, during cleaning, the handwheel 47 needs to be removed first, then the limiting cover 5 removed to release the restriction on the retaining ring. Then, the valve cover 3 is removed, causing the valve cover 3 to move the retaining ring away from the valve stem 42. Finally, the solid impurities in the sludge storage bin 411 are cleaned, achieving direct online cleaning.

[0061] In another optional embodiment, to achieve the up-and-down movement of the valve disc 43, the valve stem 42 can be threadedly connected to the valve cover 3 or the valve seat 41, and the valve stem 42 can be fixedly connected to the sleeve 441. That is, the valve stem 42 both rotates and moves. By rotating the valve stem 42 through the handwheel 47, the valve stem 42 moves up and down while rotating, thereby driving the sleeve 441 to move up and down together, and then driving the valve disc 43 to switch between the open position and the sealed position through the connecting rod 442.

[0062] In another optional embodiment, to achieve the up-and-down movement of the valve disc 43, a nut can be threaded onto the end of the valve stem 42 located outside the valve cover 3, so that the valve stem 42 is threadedly connected to the nut. The handwheel 47 is axially positioned outside the valve cover 3 and fixedly fitted onto the nut. The valve stem 42 is fixedly connected to the sleeve 441. That is, both the handwheel 47 and the nut can only rotate and cannot move axially. A support seat is provided on the valve cover 3, and the handwheel 47 is rotatably connected to the support seat to be axially positioned outside the valve cover 3. The valve stem 42 can only move axially. The handwheel 47 drives the nut to rotate, so that the valve stem 42 moves axially relative to the nut. While the valve stem 42 is moving, it can also drive the sleeve 441 to move up and down together, thereby driving the valve disc 43 to switch between the open position and the sealed position through the connecting rod 442. It should be noted that this structure for driving the valve stem 42 to move is similar to the setting of the existing rising stem gate valve, and will not be described in detail here.

[0063] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A filter comprising a valve body (1), a filter screen (2), and a valve cover (3), wherein the valve body (1) has a communicating flow chamber (11) and a filter chamber (12), the filter screen (2) extends from the filter chamber (12) into the flow chamber (11), the valve body (1) has a port communicating with the filter chamber (12) and the outside, and the valve cover (3) is detachably connected to the port, characterized in that: It also includes a drain assembly (4), which includes a valve seat (41), a valve stem (42), a valve disc (43), and a linkage structure (44). The valve seat (41) is located in the filter chamber (12) and at one end of the filter screen (2) near the valve cover (3). A sludge storage chamber (411) is formed between the valve seat (41) and the valve cover (3). The valve seat (41) is provided with a drain hole (412) communicating with the sludge storage chamber (411). One end of the valve stem (42) extends into the filter screen (2) and is connected to the valve disc (43) through the linkage structure (44). The other end extends outside the valve cover (3). The valve stem (42) can drive the valve disc (43) to flip relative to the valve seat (41) through the linkage structure (44) so ​​that the valve disc (43) seals or opens the drain hole (412).

2. The filter according to claim 1, characterized in that, The valve seat (41) has a cylindrical structure.

3. The filter according to claim 1, characterized in that, The valve seat (41) is provided with two semi-circular drain holes (412), which are symmetrical about the diameter of the valve seat (41). The valve discs (43) are semi-circular and there are two of them. The two valve discs (43) are arranged in a one-to-one correspondence with the two drain holes (412). The valve stem (42) can drive the two valve discs (43) to flip relative to the valve seat (41) simultaneously through the linkage structure (44).

4. The filter according to claim 3, characterized in that, The linkage structure (44) includes a sleeve (441) and two connecting rods (442). The sleeve (441) is fitted onto the valve stem (42). The two connecting rods (442) are symmetrically arranged on opposite sides of the sleeve (441) and correspond one-to-one with the valve disc (43). One end of the connecting rod (442) is rotatably connected to the sleeve (441), and the other end is rotatably connected to the valve disc (43).

5. The filter according to claim 4, characterized in that, The valve stem (42) is axially positioned on the valve cover (3) or the valve seat (41) and is rotatable relative to the valve cover (3) or the valve seat (41). The sleeve (441) is threaded onto the valve stem (42) and is movable along the valve stem (42).

6. The filter according to claim 5, characterized in that, It also includes a limiting cover (5), a limiting boss (421) is provided on the outer side wall of the valve stem (42), a limiting groove (413) is provided on the end face of the valve seat (41), the valve stem (42) passes through the valve seat (41) and the limiting boss (421) is accommodated in the limiting groove (413), the limiting cover (5) is fitted on the valve stem (42) and fixedly connected to the valve seat (41), and the limiting cover (5) abuts against the limiting boss (421).

7. The filter according to claim 5, characterized in that, The sewage discharge assembly (4) also includes a handwheel (47), which is connected to the end of the valve stem (42) located outside the valve cover (3).

8. The filter according to claim 4, characterized in that, The valve stem (42) is threadedly connected to the valve cover (3) or the valve seat (41), and the valve stem (42) is fixedly connected to the sleeve (441).

9. The filter according to claim 4, characterized in that, It also includes a nut and a handwheel (47), the nut being threaded onto one end of the valve stem (42) located outside the valve cover (3), the handwheel (47) being axially positioned outside the valve cover (3) and fixedly fitted onto the nut, and the valve stem (42) being fixedly connected to the sleeve (441).

10. The filter according to claim 3, characterized in that, The valve disc (43) is rotatably connected to the valve seat (41) via a connecting pin (45).

11. The filter according to claim 10, characterized in that, A torsion spring (46) is fitted on the connecting pin (45). The torsion spring (46) has two free ends (461), one of which abuts against the bottom of one of the valve discs (43), and the other of which abuts against the bottom of the other valve disc (43).

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