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 which is communicated with the filtering cavity and the outside, the valve cover is detachably connected to the port, and the pollution discharge assembly comprises a valve seat, a valve rod and a valve clack. 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, the other end of the valve rod extends out of the valve deck, and the valve rod is used for driving the valve clack to move in the axial direction of the valve rod. And the valve clack is switched between a sealing position for sealing the pollution discharge hole and an opening position for opening the pollution discharge 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 drain assembly, which includes a valve seat, a valve stem, and a valve disc. The valve seat is located inside the filter chamber and at one end of the filter screen near the valve cover. A sludge storage chamber is formed between the valve seat and the valve cover. The valve seat has a drain hole that communicates with the sludge storage chamber. One end of the valve stem extends into the filter screen and is connected to the valve disc, while the other end extends outside the valve cover. The valve stem is used to drive the valve disc to move axially, so that the valve disc switches between a sealed position that seals the drain hole and an open position that opens the drain hole.

[0009] As an optional solution, the valve seat includes a first inner ring, a first outer ring, and a first connecting rib. The first inner ring is sealed and fitted onto the valve stem. The first outer ring is sealed and connected to the inner wall of the filter chamber. The first outer ring is arranged around the outside of the first inner ring and the two are connected by the first connecting rib. The drain hole is formed between the first outer ring and the first inner ring.

[0010] As an optional solution, the valve disc includes a second inner ring, a second outer ring, and a second connecting rib. The second outer ring is used to seal the drain hole. The second inner ring is fitted onto the valve stem. The second outer ring is arranged around the outside of the second inner ring and the two are connected by the second connecting rib. A water passage hole is formed between the second outer ring and the second inner ring, and the water passage hole is directly opposite the first inner ring.

[0011] As an optional solution, the filter screen divides the flow chamber into an inlet channel and an outlet channel, and the junction of the inlet channel and the filter screen forms an outlet. In the open position, the valve disc is located at the outlet.

[0012] As an alternative, a limiting step is formed on the inner wall of the outlet, and in the open position, the second outer ring abuts against the limiting step.

[0013] As an alternative, the valve stem is axially positioned on the valve cover and is rotatable relative to the valve cover, and the valve disc is threaded onto the valve stem and is movable along the valve stem.

[0014] As an alternative, the valve disc slides axially along the filter screen via a guide sliding structure.

[0015] As an optional solution, the sewage discharge assembly also includes a handwheel connected to the end of the valve stem located outside the valve cover.

[0016] As an optional solution, it also includes a retaining ring and a limiting cover. A first limiting groove is formed on the outer side wall of the valve stem, and a second limiting groove is formed on the outer end face of the valve cover. The second limiting groove is arranged around the outer periphery of the first limiting groove. The retaining ring is simultaneously housed in the first limiting groove and the second limiting groove. The limiting cover is fitted onto the valve stem and fixedly connected to the outer end face of the valve cover. The limiting cover abuts against the retaining ring.

[0017] 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 valve disc.

[0018] 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, and the handwheel is axially positioned outside the valve cover and fixedly fitted onto the nut. The valve stem is fixedly connected to the valve disc.

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

[0020] 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 disc is driven to move axially by the valve stem, so that the valve disc moves to the position of sealing the drain hole, cutting off the connection between the sludge storage chamber and the inside of the filter screen. This causes solid impurities to accumulate in the sludge storage chamber. 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 disc is driven back to the open drain position by the valve stem.

[0021] 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

[0022] Figure 1 is a cross-sectional view of a filter provided by the prior art;

[0023] Figure 2 is a cross-sectional view of the valve body provided in an embodiment of the present invention;

[0024] Figure 3 is a first cross-sectional view of the filter provided in an embodiment of the present invention;

[0025] Figure 4 is a second cross-sectional view of the filter provided in an embodiment of the present invention;

[0026] Figure 5 is a structural schematic diagram of the sewage discharge component provided in an embodiment of this utility model;

[0027] Figure 6 is a cross-sectional view of the filter screen and valve disc in an embodiment of the present invention.

[0028] Figure 7 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; 13. Limiting step;

[0032] 2. Filter screen; 21. Protrusion;

[0033] 3. Valve cover; 31. Second limit groove;

[0034] 4. Sewage discharge assembly; 41. Valve seat; 411. First inner ring; 412. First outer ring; 413. First connecting rib; 414. Sewage discharge hole; 42. Valve stem; 421. First limiting groove; 43. Valve disc; 431. Second inner ring; 432. Second outer ring; 433. Second connecting rib; 434. Water passage hole; 435. Groove; 44. Sewage storage tank; 45. Handwheel; 46. Sealing gasket;

[0035] 5. Retaining ring; 6. Limiting cover; 7. First sealing ring; 8. 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 3, 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 and 5, the filter also includes a drain assembly 4, which includes a valve seat 41, a valve stem 42, and a valve disc 43. 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 44 is formed between the valve seat 41 and the valve cover 3. The valve seat 41 is provided with a drain hole 414 communicating with the sludge storage chamber 44. One end of the valve stem 42 extends into the filter screen 2 and is connected to the valve disc 43, while the other end extends outside the valve cover 3. The valve stem 42 is used to drive the valve disc 43 to move axially, so that the valve disc 43 switches between a sealed position that seals the drain hole 414 and an open position that opens the drain hole 414.

[0042] As shown in Figure 3, during normal use, valve disc 43 is in the position where the drain hole 414 is open. The sludge storage chamber 44 is connected to the inside of the filter screen 2 through the drain hole 414. The medium flows through the filter screen 2 for filtration. The filtered solid impurities remain inside the filter screen 2 and float in the sludge storage chamber 44 under the action of fluid and pipeline pressure. As shown in Figure 4, when decontamination is required, valve disc 43 is driven to move axially by valve stem 42, so that valve disc 43 moves to valve seat 41 and seals drain hole 414, cutting off the connection between sludge storage chamber 44 and the inside of filter screen 2, so that solid impurities accumulate in sludge storage chamber 44. Then, valve cover 3 is removed to clean the solid impurities in sludge storage chamber 44, realizing direct online decontamination. After completion, valve cover 3 is fixed, and then valve disc 43 is driven to the position where drain hole 414 is open by valve stem 42.

[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 44, they are not affected by the opening orientation of the filter screen 2, so the filter can be installed in any direction.

[0044] As shown in Figures 3 and 7, since the valve stem 42 passes through the valve seat 41 and the valve cover 3 in sequence, a first sealing ring 7 is provided between the valve stem 42 and the valve cover 3 to prevent leakage, and a second sealing ring 8 is provided between the valve stem 42 and the valve seat 41 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] Specifically, as shown in Figure 5, the valve seat 41 is an integrally formed structure, including a first inner ring portion 411, a first outer ring portion 412, and a first connecting rib 413. The first inner ring portion 411 is sealed and fitted onto the valve stem 42. The first outer ring portion 412 is sealed and connected to the inner wall of the filter chamber 12. The first outer ring portion 412 is arranged around the outside of the first inner ring portion 411, and the two are connected by the first connecting rib 413. A drain hole 414 is formed between the first outer ring portion 412 and the first inner ring portion 411. The structure is simple. When the valve disc 43 is in the position where the drain hole 414 is open, solid impurities can enter the sludge storage chamber 44 through the drain hole 414. During cleaning, the valve disc 43 moves to a position that fits against the valve seat 41 to seal the drain hole 414, thereby achieving online cleaning.

[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 filter chamber 12 is provided with a second step. The filter screen 2 is located between the first step and the second step. The first outer ring 412 is sealed against the second step and locked by multiple screws. The valve seat 41 can seal the filter screen 2 inside the filter chamber 12.

[0049] As shown in Figure 5, in this embodiment, the first outer ring portion 412 and the first inner ring portion 411 are connected by three first connecting ribs 413. The three first connecting ribs 413 are evenly spaced along the circumference of the first outer ring portion 412 to ensure the overall structural strength of the valve seat 41. This forms three arc-shaped drain holes 414 between the first outer ring portion 412 and the first inner ring portion 411. In other optional embodiments, the first outer ring portion 412 and the first inner ring portion 411 can also be connected by two, four, or more evenly spaced first connecting ribs 413, which is not specifically limited here.

[0050] Further, as shown in Figure 5, the valve disc 43 includes a second inner ring portion 431, a second outer ring portion 432, and a second connecting rib 433. The second outer ring portion 432 is used to seal the drain hole 414. The second inner ring portion 431 is fitted onto the outside of the valve stem 42. The second outer ring portion 432 is arranged around the outside of the second inner ring portion 431 and the two are connected by the second connecting rib 433. A water passage hole 434 is formed between the second outer ring portion 432 and the second inner ring portion 431. The water passage hole 434 is directly opposite the first inner ring portion 411, and the structure is simple. The outer diameter of valve disc 43 is slightly smaller than the inner diameter of filter screen 2. When valve disc 43 is in the position where the drain hole 414 is open, the medium enters the filter screen 2 through the water passage hole 434 for filtration, reducing the influence of valve disc 43 on water resistance. When cleaning, valve disc 43 moves to the position that fits the valve seat 41, the second outer ring 432 blocks the drain hole 414, and the first inner ring 411 covers the water passage hole 434 to achieve online cleaning.

[0051] As shown in Figure 3, to ensure sealing performance, annular sealing gaskets 46 are fixed to the bottom of both the first inner ring portion 411 and the first outer ring portion 412, with the two sealing gaskets 46 located on opposite sides of the bottom of the drain hole 414. When the second outer ring portion 432 seals the drain hole 414, the second outer ring portion 432 compresses the sealing gaskets 46, thereby achieving a seal on the drain hole 414.

[0052] As shown in Figure 5, in this embodiment, the second outer ring portion 432 and the second inner ring portion 431 are connected by two second connecting ribs 433. The two second connecting ribs 433 are symmetrically arranged about the center of the second inner ring portion 431 to ensure the overall structural strength of the valve disc 43. This results in two semi-circular water passage holes 434 being formed between the second outer ring portion 432 and the second inner ring portion 431. In other optional embodiments, the second outer ring portion 432 and the second inner ring portion 431 can also be connected by three, four, or more evenly arranged second connecting ribs 433, without specific limitations.

[0053] Specifically, as shown in Figure 3, the water outlet is formed at the junction of the inlet channel 111 and the filter screen 2. When in the open position, the valve disc 43 is located at the outlet. After the medium enters from the inlet channel 111, it enters the filter screen 2 through the water passage 434 of the valve disc 43 for filtration, which can reduce the influence of the valve disc 43 on water resistance. The solid impurities filtered out in the filter screen 2 float in the sludge storage tank 44 through the drain hole 414 of the valve seat 41 under the action of fluid and pipeline pressure. During cleaning, the valve disc 43 is driven to move by the valve stem 42, so that the valve disc 43 moves from one end of the filter screen 2 to the other end and seals the drain hole 414. Some impurities attached to the inner wall of the filter screen 2 are also carried into the sludge storage tank 44 when the valve disc 43 moves, making the cleaning more thorough. Then, the valve cover 3 is removed to clean the solid impurities in the sludge storage tank 44, realizing direct online cleaning.

[0054] Furthermore, as shown in Figure 3, a limiting step 13 is formed on the inner wall of the outlet. The limiting step 13 is located at the bottom of the filter screen 2. When in the open position, the second outer ring 432 abuts against the limiting step 13. The limiting step 13 can limit the movement limit position of the valve disc 43 to prevent the valve disc 43 from dislodging from the valve stem 42.

[0055] In this embodiment, to enable the valve disc 43 to move up and down, the valve stem 42 is axially positioned on the valve cover 3 and can rotate relative to the valve cover 3. The valve disc 43 is threadedly connected to the valve stem 42 and can move along the valve stem 42. That is to say, in this embodiment, the valve stem 42 can only rotate and cannot move axially. By rotating the valve stem 42, the valve disc 43 moves up and down along the thread of the valve stem 42, so that the valve disc 43 can switch between the open position and the sealed position, which is convenient to operate.

[0056] As shown in Figure 3, the sewage discharge assembly 4 also includes a handwheel 45, which is connected to the end of the valve stem 42 located outside the valve cover 3. By rotating the handwheel 45, the valve stem 42 can be driven to rotate, thereby causing the valve disc 43 to move up and down along the valve stem 42, which is convenient to operate and saves time and effort.

[0057] In this embodiment, the end of the valve stem 42 is configured as a quadrilateral structure, and the handwheel 45 has a quadrilateral hole in its center. The handwheel 45 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 45 is rotated, the handwheel 45 can drive the valve stem 42 to rotate together. In other optional embodiments, the fit between the valve stem 42 and the handwheel 45 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.

[0058] Furthermore, the valve disc 43 slides along the axial direction of the filter screen 2 via a guide sliding structure. In this way, the guide sliding structure between the valve disc 43 and the filter screen 2 can circumferentially limit the valve disc 43, preventing the valve disc 43 from rotating along with the valve stem 42.

[0059] Specifically, in this embodiment, as shown in Figure 6, the guide sliding structure includes a protrusion 21 and a groove 435. The inner wall of the filter screen 2 has a protrusion 21 extending axially, and the outer periphery of the valve disc 43 has a groove 435 that mates with the protrusion 21. Thus, the engagement of the protrusion 21 and the groove 435 allows for circumferential positioning of the valve disc 43, preventing it from rotating when the valve stem 42 rotates. It should be noted that, referring to Figure 2, since the valve disc 43 is located at the bottom of the filter screen 2 in the open position, the protrusion 21 inside the filter screen 2 can extend to the bottom of the filter screen 2 and engage with the groove 435 on the valve disc 43.

[0060] In another optional embodiment, the inner wall of the filter screen 2 is provided with a rib extending along its axial direction, and a groove 435 extending along its axial direction is provided on the rib. The outer periphery of the valve disc 43 is provided with a protrusion 21 that cooperates with the groove 435, which can also achieve the above-mentioned anti-rotation effect, and will not be described in detail here.

[0061] In this embodiment, to axially position the valve stem 42 within the valve cover 3, as shown in Figures 3 and 7, the filter further includes a retaining ring 5 and a limiting cover 6. A first limiting groove 421 is formed on the outer side wall of the valve stem 42, and a second limiting groove 31 is formed on the outer end face of the valve cover 3. The second limiting groove 31 is arranged around the outer periphery of the first limiting groove 421. The retaining ring 5 is simultaneously accommodated within the first limiting groove 421 and the second limiting groove 31. The limiting cover 6 is fitted onto the valve stem 42 and fixedly connected to the outer end face of the valve cover 3 by multiple screws, pressing against the retaining ring 5. By restricting the retaining ring 5 with the limiting cover 6, the valve stem 42 can only rotate and cannot move axially. During decontamination, the handwheel 45 is first removed, then the limiting cover 6 is removed to release the restriction on the retaining ring 5. Then, the valve cover 3 is removed, causing the valve cover 3 to move the retaining ring 5 away from the valve stem 42. Finally, the solid impurities in the sludge storage bin 44 are cleaned, achieving direct online decontamination.

[0062] In other alternative embodiments, the valve stem 42 can be axially fixedly connected to the valve seat 42, while the valve stem 42 and the valve cover 3 are only sealed together. Specifically, the valve seat 42 has a second limiting groove 31 similar to the one described above, and the valve stem 42 has an integrally formed limiting boss. After the valve stem 42 passes through the valve seat 42, the limiting boss is accommodated within the second limiting groove 31. The limiting cover 6 is fitted onto the valve stem 42 and fixedly connected to the valve seat 42 by multiple screws. The limiting cover 6 presses against the limiting boss, thus achieving the goal of allowing the valve stem 42 to rotate without axial movement. In this way, during cleaning, the handwheel 45 is first removed, then the valve cover 3 is removed, allowing the valve cover 3 to detach from the valve stem 42. Finally, the solid impurities in the sludge storage bin 44 are cleaned, achieving direct online cleaning.

[0063] 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 and the valve disc 43 can be fixedly connected. That is, the valve stem 42 both rotates and moves. By rotating the valve stem 42 through the handwheel 45, the valve stem 42 can drive the valve disc 43 to move up and down together while rotating, so that the valve disc 43 switches between the open position and the sealed position.

[0064] 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 45 is axially positioned outside the valve cover 3 and fixedly fitted onto the nut, thus the valve stem 42 and valve disc 43 are fixedly connected. That is, both the handwheel 45 and the nut can only rotate and cannot move axially. A support seat is provided on the valve cover 3, and the handwheel 45 is rotatably connected to the support seat to be axially positioned outside the valve cover 3. The valve stem 42 can only move axially. By driving the nut to rotate through the handwheel 45, the valve stem 42 moves axially relative to the nut. While the valve stem 42 is moving, it can also drive the valve disc 43 to move up and down together, so that the valve disc 43 switches between the open position and the sealed position. 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.

[0065] 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), and a valve disc (43). 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 (44) is formed between the valve seat (41) and the valve cover (3). The valve seat (41) is provided with a drain hole (414) communicating with the sludge storage chamber (44). One end of the valve stem (42) extends into the filter screen (2) and is connected to the valve disc (43), and the other end extends out of the valve cover (3). The valve stem (42) is used to drive the valve disc (43) to move along its axial direction so that the valve disc (43) switches between a sealed position that seals the drain hole (414) and an open position that opens the drain hole (414).

2. The filter according to claim 1, characterized in that, The valve seat (41) includes a first inner ring (411), a first outer ring (412), and a first connecting rib (413). The first inner ring (411) is sealed and fitted around the valve stem (42). The first outer ring (412) is sealed and connected to the inner wall of the filter chamber (12). The first outer ring (412) is arranged around the outside of the first inner ring (411) and the two are connected by the first connecting rib (413). The drain hole (414) is formed between the first outer ring (412) and the first inner ring (411).

3. The filter according to claim 2, characterized in that, The valve disc (43) includes a second inner ring (431), a second outer ring (432), and a second connecting rib (433). The second outer ring (432) is used to seal the drain hole (414). The second inner ring (431) is fitted onto the valve stem (42). The second outer ring (432) is arranged around the outside of the second inner ring (431) and the two are connected by the second connecting rib (433). A water passage hole (434) is formed between the second outer ring (432) and the second inner ring (431). The water passage hole (434) is directly opposite the first inner ring (411).

4. The filter according to claim 3, characterized in that, The filter screen (2) divides the flow chamber (11) into an inlet channel (111) and an outlet channel (112). The junction of the inlet channel (111) and the filter screen (2) forms an outlet. In the open position, the valve disc (43) is located at the outlet.

5. The filter according to claim 4, characterized in that, A limiting step (13) is formed on the inner wall of the outlet. When in the open position, the second outer ring (432) abuts against the limiting step (13).

6. The filter according to any one of claims 1-5, characterized in that, The valve stem (42) is axially positioned on the valve cover (3) and can rotate relative to the valve cover (3). The valve disc (43) is threaded onto the valve stem (42) and can move along the valve stem (42).

7. The filter according to claim 6, characterized in that, The valve disc (43) slides along the axial direction of the filter screen (2) via a guide sliding structure.

8. The filter according to claim 7, characterized in that, The sewage discharge assembly (4) also includes a handwheel (45), which is connected to the end of the valve stem (42) located outside the valve cover (3).

9. The filter according to claim 7, characterized in that, It also includes a retaining ring (5) and a limiting cover (6). A first limiting groove (421) is provided on the outer side wall of the valve stem (42), and a second limiting groove (31) is provided on the outer end face of the valve cover (3). The second limiting groove (31) is arranged around the outer periphery of the first limiting groove (421). The retaining ring (5) is simultaneously housed in the first limiting groove (421) and the second limiting groove (31). The limiting cover (6) is fitted onto the valve stem (42) and fixedly connected to the outer end face of the valve cover (3). The limiting cover (6) presses against the retaining ring (5).

10. The filter according to any one of claims 1-5, 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 valve disc (43).

11. The filter according to any one of claims 1-5, characterized in that, It also includes a nut and a handwheel (45), the nut being threaded onto one end of the valve stem (42) located outside the valve cover (3), the handwheel (45) being axially positioned outside the valve cover (3) and fixedly fitted onto the nut, and the valve stem (42) being fixedly connected to the valve disc (43).

Images