CN224188111U - Filter - Google Patents

Abstract

This utility model belongs to the technical field of fluid pipeline systems and discloses a filter. The filter includes a valve body, a filter screen, a valve cover, and a drain assembly. The valve body has a connected flow chamber and a filter chamber. The filter screen extends from the filter chamber into the flow chamber. The valve body has a port connecting the filter chamber and the outside. The valve cover is detachably connected to the port. The drain assembly includes a valve seat, a valve stem, and a valve disc. The valve seat is located in the filter chamber and at the end of the filter screen near the valve cover, forming a sludge storage chamber between the valve seat and the valve cover. The valve seat has a drain hole communicating with the sludge storage chamber. One end of the valve stem extends into the filter screen and connects to the valve disc, while the other end extends outside the valve cover. The valve stem drives the valve disc to move axially, switching the valve disc between a sealed position (sealed drain hole) and an open position (open drain hole). The filter provided by this utility model can achieve online cleaning, is convenient and quick to use, and its installation direction is unrestricted.

Description

Filter

Technical Field

The utility model relates to the technical field of fluid pipeline systems, in particular to a filter.

Background

The filter is an indispensable device in the fluid medium conveying pipeline, is usually arranged at the inlet end of a pressure reducing valve, a pressure relief valve, a fixed water level valve or other equipment, is used for filtering solid impurities in water in the pipeline, and is used for avoiding the blockage of the pipeline or the scaling in the pipeline by the impurities so as to ensure the normal use of the valve equipment.

As shown in fig. 1, the conventional filter mainly comprises a valve body 10, a filter screen 20 and a valve cover 30, wherein the filter screen 20 is arranged in the valve body 10, and the valve cover 30 is used for blocking the filter screen 20 in the valve body 10. The existing filter has the defects that firstly, when solid impurities in the filter screen 20 are cleaned, the valve cover 30 is required to be opened, and medium can flow everywhere and even splash on a worker, so that the online cleaning cannot be realized, the medium circulation in a pipeline can only be stopped when the cleaning is realized, then the valve cover 30 is detached for cleaning, the operation is complicated, the pipeline can not work continuously, so that the use is inconvenient, and secondly, in order to enable the solid impurities to be accumulated at the valve cover 30 under the action of gravity for cleaning, the installation direction of the filter is limited, and only the filter screen 20 can be downwards arranged.

Accordingly, there is a need to provide a filter to solve the above problems.

Disclosure of utility model

The utility model aims to provide a filter which can realize online dirt removal, is convenient and quick to use and is not limited in installation direction.

To achieve the purpose, the utility model adopts the following technical scheme:

The filter comprises a valve body, a filter screen and a valve cover, wherein an overflow cavity and a filter cavity which are communicated are arranged in the valve body, the filter screen extends from the filter cavity to the overflow cavity, the valve body is provided with a port which is communicated with the filter cavity and the outside, and the valve cover is detachably connected with the port;

Still include blowdown subassembly, blowdown subassembly includes disk seat, valve rod and valve clack, the disk seat is located in the filter chamber and be located the filter screen is close to the one end of valve gap, the disk seat with form between the valve gap and store up dirty storehouse, be equipped with on the disk seat with store up dirty storehouse intercommunication's blowdown hole, the one end of valve rod extend to in the filter screen and with the valve clack is connected, the other end extends to outside the valve gap, the valve rod is used for the drive the valve clack is along its axial displacement, so that the valve clack is sealed the sealing position of blowdown hole with open between the open position of blowdown hole.

As an alternative scheme, the valve seat comprises a first inner ring part, a first outer ring part and a first connecting rib, wherein the first inner ring part is sleeved outside the valve rod in a sealing way, the first outer ring part is connected with the inner wall of the filter cavity in a sealing way, the first outer ring part is arranged on the outer side of the first inner ring part in a surrounding way and is connected with the first inner ring part through the first connecting rib, and a drain hole is formed between the first outer ring part and the first inner ring part.

As an alternative scheme, the valve clack includes second inner ring portion, second outer loop portion and second connecting rib, second outer loop portion is used for sealing the blowdown hole, second inner ring portion suit in outside the valve rod, second outer loop portion ring is located the outside of second inner ring portion and between the two be connected through the second connecting rib, second outer loop portion with form the water hole between the second inner ring portion, the water hole with first inner ring portion is just right.

As an alternative scheme, the filter screen divides the overflow cavity into a water inlet flow channel and a water outlet flow channel, a water outlet is formed at the junction of the water inlet flow channel and the filter screen, and the valve clack is positioned at the water outlet when in the opening position.

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

As an alternative, the valve stem is axially positioned in the valve cap and rotatable relative to the valve cap, and the flap is threadably connected to the valve stem and is movable along the valve stem.

As an alternative, the valve flap slides along the axial direction of the filter screen through a guiding sliding structure.

As an alternative, the sewage draining assembly further comprises a hand wheel, and the hand wheel is connected to one end of the valve rod, which is located outside the valve cover.

As an alternative scheme, still include retaining ring and spacing lid, first spacing groove has been seted up on the lateral wall of valve rod, the second spacing groove has been seted up on the outer terminal surface of valve gap, the second spacing groove ring is located the periphery of first spacing groove, the retaining ring hold in simultaneously first spacing groove with in the second spacing groove, spacing lid suit in the valve rod is outer and fixed connection in on the outer terminal surface of valve gap, spacing lid support press in on the retaining ring.

As an alternative, the valve rod is in threaded connection with the valve cover or the valve seat, and the valve rod is fixedly connected with the valve clack.

As an alternative scheme, the valve further comprises a nut and a hand wheel, wherein the nut is in threaded fit with one end of the valve rod, which is located outside the valve cover, the hand wheel is axially located outside the valve cover and is fixedly sleeved outside the nut, and the valve rod is fixedly connected with the valve clack.

The utility model has the beneficial effects that:

The utility model provides a filter, in normal use, a valve clack is positioned at a position for opening a drain hole, a sewage storage bin is communicated with the inside of a filter screen through the drain hole, a medium flows through the filter screen to be filtered, filtered solid impurity particles are remained in the inside of the filter screen and accumulated in the sewage storage bin through drain Kong Fu under the action of fluid and pipeline pressure, when the sewage is required to be removed, the valve clack is driven by a valve rod to move along the axial direction of the valve clack, so that the valve clack moves to a position for sealing the drain hole, the communication between the sewage storage bin and the inside of the filter screen is cut off, the valve cover is detached, the solid impurities in the sewage storage bin are cleaned, the on-line direct sewage removal is realized, the valve cover is fixed after the on-line sewage is completed, and then the valve clack is driven to the position for opening the drain hole through the valve rod.

Therefore, the filter provided by the utility model can realize online dirt removal without water cut-off and pressure break, is simple and convenient to operate and high in efficiency, avoids incomplete dirt removal and uncleanness caused by that solid impurities are brought back into a pipeline due to backflow of pressure break fluid of the pipeline, can ensure normal continuous operation of the pipeline, and avoids economic loss caused by water cut-off and pressure break of a system.

Drawings

FIG. 1 is a cross-sectional view of a filter provided by the prior art;

FIG. 2 is a cross-sectional view of a valve body provided by an embodiment of the present utility model;

FIG. 3 is a first cross-sectional view of a filter provided by an embodiment of the present utility model;

FIG. 4 is a second cross-sectional view of a filter provided by an embodiment of the present utility model;

FIG. 5 is a schematic view of a drain assembly according to an embodiment of the present utility model;

FIG. 6 is a cross-sectional view of a filter screen mated with a valve flap provided by an embodiment of the present utility model;

Fig. 7 is a partial enlarged view at a in fig. 3.

In the figure:

10. valve body, 20, filter screen, 30, valve cover;

1. A valve body; 11 parts of overflow cavity, 111 parts of water inlet runner, 112 parts of water outlet runner, 12 parts of filter cavity, 13 parts of limit step;

2. a filter screen, a protrusion;

3. 31, a second limit groove;

4. The sewage disposal assembly comprises a sewage disposal assembly body 41, a valve seat 411, a first inner ring part 412, a first outer ring part 413, a first connecting rib, a 414, a sewage disposal hole 42, a valve rod 421, a first limiting groove 43, a valve clack 431, a second inner ring part 432, a second outer ring part 433, a second connecting rib 434, a water passing hole 435, a groove 44, a sewage storage bin 45, a hand wheel 46 and a sealing gasket;

5. The sealing device comprises a check ring, a limit cover, a first sealing ring, a second sealing ring and a second sealing ring.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.

In the description of the present utility model, unless explicitly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may, for example, be fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, directly connected, indirectly connected through an intervening medium, or in communication between two elements or in an interaction relationship between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

As shown in fig. 2 and 3, the present embodiment provides a filter, which includes a valve body 1, a filter screen 2 and a valve cover 3, wherein an overflow cavity 11 and a filter cavity 12 are connected in the valve body 1, a dotted line in fig. 2 is a boundary between the overflow cavity 11 and the filter cavity 12, the upper side of the dotted line is the filter cavity 12, and the lower side of the dotted line is the overflow cavity 11. The filter screen 2 is cylindrical, the filter screen 2 extends from the filter cavity 12 into the overflow cavity 11, namely, one part of the filter screen 2 is positioned in the filter cavity 12, the other part of the filter screen 2 is positioned in the overflow cavity 11, the overflow cavity 11 is divided into a water inlet flow channel 111 on one side and a water outlet flow channel 112 on the other side, and the port of the filter screen 2 faces the water inlet flow channel 111. The valve body 1 is provided with a port communicating the filter chamber 12 with the outside, and the valve cover 3 is detachably connected to the port. When in use, as shown by the arrow direction in fig. 3, the medium flows into the filter screen 2 from the water inlet channel 111 for filtering, and flows out from the water outlet channel 112, and the filtered impurities remain in the filter screen 2, so that the impurities are prevented from blocking the pipeline or scaling in the pipeline, and the normal use of the valve equipment is ensured.

Further, referring to fig. 3 and 5, the filter further includes a drain assembly 4, the drain assembly 4 includes a valve seat 41, a valve rod 42 and a valve clack 43, the valve seat 41 is disposed in the filter cavity 12 and is located at one end of the filter screen 2 near the valve cover 3, a sewage storage chamber 44 is formed between the valve seat 41 and the valve cover 3, a drain hole 414 communicated with the sewage storage chamber 44 is disposed on the valve seat 41, one end of the valve rod 42 extends into the filter screen 2 and is connected with the valve clack 43, the other end extends out of the valve cover 3, and the valve rod 42 is used for driving the valve clack 43 to move along the axial direction thereof, so that the valve clack 43 is switched between a sealing position for sealing the drain hole 414 and an opening position for opening the drain hole 414.

In normal use, as shown in fig. 3, the valve clack 43 is positioned at a position for opening the drain hole 414, the sewage storage bin 44 is communicated with the inside of the filter screen 2 through the drain hole 414, a medium flows through the filter screen 2 for filtering, the filtered solid impurity particles remain in the inside of the filter screen 2 and float in the sewage storage bin 44 through the drain hole 414 under the action of fluid and pipeline pressure, and when the sewage is required to be removed, the valve clack 43 is driven to move along the axial direction by the valve rod 42, so that the valve clack 43 moves to the valve seat 41 and seals the drain hole 414, the communication between the sewage storage bin 44 and the inside of the filter screen 2 is cut off, the solid impurities are accumulated in the sewage storage bin 44, then the valve cover 3 is detached, the solid impurities in the sewage storage bin 44 are cleaned, the online direct sewage removal is realized, the valve cover 3 is fixed after the online sewage removal is finished, and then the valve clack 43 is driven to the position for opening the drain hole 414 by the valve rod 42.

Therefore, the filter provided by the embodiment can realize online dirt removal, does not need to stop water and cut off pressure, is simple and convenient to operate and high in efficiency, avoids bringing solid impurities back into the pipeline due to backflow of pipeline cut-off pressure fluid, and can ensure that the pipeline is not thorough and clean to remove dirt, and meanwhile, can ensure normal continuous operation of the pipeline, avoid economic loss caused by system water cut-off and cut-off pressure, and is not influenced by the opening orientation of the filter screen 2 because the impurities are concentrated in the dirt storage bin 44, so that the filter can be installed in any direction.

As shown in fig. 3 and 7, since the valve rod 42 sequentially penetrates the valve seat 41 and the valve cover 3, in order to prevent leakage, a first sealing ring 7 is provided between the valve rod 42 and the valve cover 3, and a second sealing ring 8 is provided between the valve rod 42 and the valve seat 41, so as to ensure sealing performance between the valve rod 42 and the valve seat 41 and between the valve cover 3.

In the present embodiment, in order to facilitate the dismounting and sealing effect of the valve cover 3, the valve cover 3 is fixed at the port of the filter chamber 12 communicating with the outside by a plurality of bolts and nuts. In other alternative embodiments, the valve cover 3 may be screwed to the filter chamber 12 at a port communicating with the outside.

In this embodiment, as shown in fig. 2, the filter chamber 12 is disposed obliquely with respect to the through-flow chamber 11, i.e., the filter is a Y-shaped filter. In alternative embodiments, the filter chamber 12 may be arranged perpendicular to the flow chamber 11, i.e. the filter is a T-filter.

Specifically, as shown in fig. 5, the valve seat 41 is an integrally formed structure, and includes 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 sleeved outside the valve rod 42, the first outer ring portion 412 is connected with the inner wall of the filter cavity 12 in a sealing manner, the first outer ring portion 412 is annularly arranged outside the first inner ring portion 411 and connected with the first inner ring portion 411 through the first connecting rib 413, and a drain hole 414 is formed between the first outer ring portion 412 and the first inner ring portion 411. When the valve clack 43 is positioned at the position of opening the sewage drain hole 414, solid impurities can enter the sewage storage bin 44 through the sewage drain hole 414, and when the sewage is cleaned, the valve clack 43 moves to the position of being attached to the valve seat 41 so as to seal the sewage drain hole 414, and online sewage removal is realized.

It should be noted that, the inner wall of the valve body 1 is provided with a first step, and the bottom end of the filter screen 2 abuts against the first step to limit after the filter screen 2 stretches into the overflow cavity 11. The inner wall of the filter cavity 12 is provided with a second step, the filter screen 2 is positioned between the first step and the second step, the first outer ring part 412 is sealed and abutted against the second step and locked by a plurality of screws, and the valve seat 41 can seal the filter screen 2 in the filter cavity 12.

As shown in fig. 5, in the present embodiment, the first outer ring portion 412 is connected to the first inner ring portion 411 by three first connection ribs 413, and the three first connection ribs 413 are uniformly arranged along the circumferential direction of the first outer ring portion 412 at intervals to ensure the overall structural strength of the valve seat 41, so that three arc-shaped drain holes 414 are formed between the first outer ring portion 412 and the first inner ring portion 411. In other alternative embodiments, the first outer ring portion 412 and the first inner ring portion 411 may be connected by two, four or more first connection ribs 413 that are uniformly arranged, which is not specifically limited herein.

Further, as shown in fig. 5, the valve clack 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 for sealing the drain hole 414, the second inner ring portion 431 is sleeved outside the valve rod 42, the second outer ring portion 432 is annularly arranged outside the second inner ring portion 431 and connected with the second inner ring portion 431 through the second connecting rib 433, a water passing hole 434 is formed between the second outer ring portion 432 and the second inner ring portion 431, and the water passing hole 434 is opposite to the first inner ring portion 411, so that the structure is simple. When the valve clack 43 is positioned at the position of opening the sewage hole 414, a medium enters the filter screen 2 through the water hole 434 to be filtered, the influence of the valve clack 43 on water resistance is reduced, when the valve clack 43 is cleaned, the valve clack 43 moves to a position attached to the valve seat 41, the second outer ring part 432 seals the sewage hole 414, and the first inner ring part 411 covers the water hole 434 to realize online decontamination.

As shown in fig. 3, in order to ensure sealing performance, annular sealing gaskets 46 are fixed to the bottoms of the first inner ring portion 411 and the first outer ring portion 412, and the two sealing gaskets 46 are 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 presses the sealing gasket 46, thereby achieving sealing of the drain hole 414.

As shown in fig. 5, in the present embodiment, the second outer ring portion 432 and the second inner ring portion 431 are connected by two second connection ribs 433, and the two second connection ribs 433 are symmetrically arranged about the center of the second inner ring portion 431 to ensure the overall structural strength of the valve flap 43, so that two semi-circular-like water passing holes 434 are formed between the second outer ring portion 432 and the second inner ring portion 431. In other alternative embodiments, the second outer ring portion 432 and the second inner ring portion 431 may be connected by three, four or more second connection ribs 433 that are uniformly arranged, which is not specifically limited herein.

Specifically, as shown in fig. 3, the junction between the water inlet flow passage 111 and the filter screen 2 forms a water outlet, and in the open position, the valve flap 43 is located at the water outlet. When the medium enters from the water inlet flow channel 111, the medium enters the filter screen 2 through the water passing hole 434 of the valve clack 43 to be filtered, so that the influence of the valve clack 43 on water resistance can be reduced, solid impurities filtered out of the filter screen 2 float in the dirt storage bin 44 through the dirt discharging hole 414 of the valve seat 41 under the action of fluid and pipeline pressure, when the filter screen is cleaned, the valve clack 43 is driven by the valve rod 42 to move, so that the valve clack 43 moves from one end to the other end of the filter screen 2 to seal the dirt discharging hole 414, part of impurities attached to the inner wall of the filter screen 2 can be brought into the dirt storage bin 44 when the valve clack 43 moves, the dirt cleaning is more thorough, and then the valve cover 3 is detached to clean the solid impurities in the dirt storage bin 44, so that on-line direct dirt cleaning is realized.

Further, as shown in fig. 3, a limiting step 13 is formed on the inner wall of the water outlet, the limiting step 13 is located at the bottom of the filter screen 2, and the second outer ring 432 abuts against the limiting step 13 when in the open position. The limiting step 13 can limit the movement limit position of the valve flap 43 to prevent the valve flap 43 from being separated from the valve stem 42.

In this embodiment, to achieve up and down movement of the clapper 43, the valve stem 42 is axially positioned in the valve cap 3 and rotatable relative to the valve cap 3, and the clapper 43 is threadably connected to the valve stem 42 and is movable along the valve stem 42. That is, in the present embodiment, the valve stem 42 is rotatable only and cannot be moved in the axial direction, and by rotating the valve stem 42, the valve flap 43 is moved up and down along the thread of the valve stem 42 to switch the valve flap 43 between the open position and the sealed position, which is convenient to operate.

As shown in fig. 3, the drain assembly 4 further includes a hand wheel 45, the hand wheel 45 being connected to an end of the valve stem 42 that is located outside the valve cover 3. By rotating the hand wheel 45, the valve rod 42 can be driven to rotate, so that the valve clack 43 is driven to move up and down along the valve rod 42, and the operation is convenient, time-saving and labor-saving.

In this embodiment, the end of the valve rod 42 is set to a quadrilateral structure, the center of the hand wheel 45 is provided with a quadrilateral hole, the hand wheel 45 is sleeved on the quadrilateral structure at the end of the valve rod 42 through the quadrilateral hole, so that circumferential rotation limiting connection is formed, and when the hand wheel 45 is rotated, the hand wheel 45 can drive the valve rod 42 to rotate together. In alternative embodiments, the engagement between the valve stem 42 and the hand wheel 45 may take the form of a triangle, pentagon, or the like, which may form a circumferential rotation limiting connection, and is not specifically limited herein.

Further, the valve flap 43 slides in the axial direction of the filter screen 2 by a guide sliding structure. Thus, the valve clack 43 can be limited in the circumferential direction through the guiding sliding structure between the valve clack 43 and the filter screen 2, and the valve clack 43 is prevented from rotating when the valve rod 42 rotates.

Specifically, in the present embodiment, as shown in fig. 6, the guide sliding structure includes a protrusion 21 and a groove 435, the protrusion 21 extending in the axial direction thereof is provided on the inner wall of the filter screen 2, and the groove 435 that mates with the protrusion 21 is provided on the outer peripheral side of the valve flap 43. Thus, by the engagement of the protrusion 21 and the recess 435, the valve flap 43 can be circumferentially restrained, and the valve flap 43 is prevented from rotating when the valve stem 42 rotates. It should be noted that, in connection with fig. 2, since the valve flap 43 is located at the bottom of the filter screen 2 when in the open position, the protrusion 21 inside the filter screen 2 may extend to the bottom of the filter screen 2 to engage with the recess 435 on the valve flap 43.

In another alternative embodiment, the inner wall of the filter screen 2 is provided with a rib extending along the axial direction thereof, the rib is provided with a groove 435 extending along the axial direction thereof, the outer peripheral side of the valve clack 43 is provided with a protrusion 21 matched with the groove 435, and the anti-rotation effect can be achieved as well, which is not described herein.

In this embodiment, in order to axially position the valve rod 42 in the valve cover 3, as shown in fig. 3 and 7, the filter further includes a retainer ring 5 and a limiting cover 6, a first limiting groove 421 is formed on an outer side wall of the valve rod 42, a second limiting groove 31 is formed on an outer end surface of the valve cover 3, the second limiting groove 31 is annularly arranged on the periphery of the first limiting groove 421, the retainer ring 5 is simultaneously accommodated in the first limiting groove 421 and the second limiting groove 31, the limiting cover 6 is sleeved outside the valve rod 42 and fixedly connected to the outer end surface of the valve cover 3 through a plurality of screws, and the limiting cover 6 is abutted against the retainer ring 5. The check ring 5 is limited by the limit cover 6, so that the valve rod 42 can only rotate and cannot axially move, when in decontamination, the hand wheel 45 is detached firstly, then the limit cover 6 is detached, the limit to the check ring 5 is removed, then the valve cover 3 is detached, the valve cover 3 drives the check ring 5 to be separated from the valve rod 42 together, and finally solid impurities in the dirt storage bin 44 are cleaned, so that on-line direct decontamination is realized.

In alternative embodiments, the valve stem 42 may be axially fixedly connected to the valve seat 42, with the valve stem 42 only sealingly engaging the valve cover 3. That is, the valve seat 42 is provided with a second limit groove 31 similar to the above, the valve rod 42 is integrally provided with a limit boss, after the valve rod 42 penetrates through the valve seat 42, the limit boss is accommodated in the second limit groove 31, the limit cover 6 is sleeved outside the valve rod 42 and fixedly connected to the valve seat 42 through a plurality of screws, the limit cover 6 is propped against the limit boss, and the purpose that the valve rod 42 only rotates and does not axially move can be realized. Therefore, when the dirt is removed, the hand wheel 45 is firstly disassembled, then the valve cover 3 is disassembled, the valve cover 3 can be separated from the valve rod 42, and finally, solid impurities in the dirt storage bin 44 are cleaned, so that the on-line direct dirt removal is realized.

In an alternative embodiment, in order to achieve the up-and-down movement of the flap 43, the valve rod 42 may be screwed to the valve cover 3 or the valve seat 41, and the valve rod 42 is fixedly connected to the flap 43. That is, the valve stem 42 is both rotated and moved, and the valve stem 42 is rotated by the hand wheel 45, so that the valve stem 42 can drive the valve flap 43 to move up and down together while rotating, so that the valve flap 43 is switched between the open position and the sealed position.

In another alternative embodiment, in order to realize the up-and-down movement of the valve clack 43, a nut may be sleeved on the end of the valve rod 42 located outside the valve cover 3 through external threads, so that the valve rod 42 is in threaded connection with the nut, the hand wheel 45 is axially located outside the valve cover 3 and fixedly sleeved outside the nut, and the valve rod 42 is fixedly connected with the valve clack 43. That is, the hand wheel 45 and the nut can only rotate and cannot axially move, the valve cover 3 is provided with a supporting seat, the hand wheel 45 is rotatably connected to the supporting seat, so that the valve rod 42 can only axially move by being axially positioned outside the valve cover 3 on the supporting seat, the hand wheel 45 drives the nut to rotate, the valve rod 42 axially moves relative to the nut, and the valve rod 42 can drive the valve clack 43 to jointly move up and down while moving, so that the valve clack 43 can be switched between the open position and the sealed position. It should be noted that, the structure for driving the valve rod 42 to move is similar to the arrangement of the prior art open-rod gate valve, and will not be repeated here.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the utility model. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (11)

1. The utility model provides a filter, includes valve body (1), filter screen (2) and valve gap (3), be equipped with overflow chamber (11) and filter chamber (12) that are linked together in valve body (1), filter screen (2) are followed filter chamber (12) extend to in overflow chamber (11), valve body (1) are equipped with the intercommunication filter chamber (12) and outside port, valve gap (3) detachable connect in port, its characterized in that:

Still include blowdown subassembly (4), blowdown subassembly (4) include disk seat (41), valve rod (42) and valve clack (43), disk seat (41) are located in filtration chamber (12) and be located filter screen (2) are close to the one end of valve gap (3), disk seat (41) with form between valve gap (3) and store up dirty storehouse (44), be equipped with on disk seat (41) with store up dirty storehouse (44) intercommunication blowdown hole (414), the one end of valve rod (42) extend to in filter screen (2) and with valve clack (43) are connected, the other end extends to outside valve gap (3), valve rod (42) are used for driving valve clack (43) are along its axial displacement, so that valve clack (43) are sealed seal between the sealed position of blowdown hole (414) and the open position of blowdown hole (414) switch.

2. The filter according to claim 1, wherein the valve seat (41) comprises a first inner ring part (411), a first outer ring part (412) and a first connecting rib (413), the first inner ring part (411) is sleeved outside the valve rod (42), the first outer ring part (412) is in sealing connection with the inner wall of the filter cavity (12), the first outer ring part (412) is arranged on the outer side of the first inner ring part (411) in a surrounding manner and is connected with the first inner ring part (411) through the first connecting rib (413), and the drain hole (414) is formed between the first outer ring part (412) and the first inner ring part (411).

3. The filter according to claim 2, wherein the valve flap (43) comprises 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 for sealing the drain hole (414), the second inner ring portion (431) is sleeved outside the valve rod (42), the second outer ring portion (432) is annularly arranged outside the second inner ring portion (431) and connected with the second inner ring portion (431) through the second connecting rib (433), a water passing hole (434) is formed between the second outer ring portion (432) and the second inner ring portion (431), and the water passing hole (434) is opposite to the first inner ring portion (411).

4. A filter according to claim 3, characterized in that the filter screen (2) separates the flow-through chamber (11) into a water inlet flow channel (111) and a water outlet flow channel (112), the junction of the water inlet flow channel (111) and the filter screen (2) forming a water outlet, the valve flap (43) being located at the water outlet in the open position.

5. A filter according to claim 4, wherein a stop step (13) is formed on the inner wall of the outlet, the second outer ring portion (432) abutting the stop step (13) in the open position.

6. A filter according to any one of claims 1-5, characterized in that the valve stem (42) is axially positioned in the valve cap (3) and is rotatable relative to the valve cap (3), and that the flap (43) is screwed onto the valve stem (42) and is movable along the valve stem (42).

7. A filter according to claim 6, characterized in that the flap (43) slides in the axial direction of the filter screen (2) by means of a guided sliding structure.

8. The filter according to claim 7, wherein the drain assembly (4) further comprises a hand wheel (45), the hand wheel (45) being connected to an end of the valve stem (42) located outside the valve cover (3).

9. The filter according to claim 7, further comprising a retainer ring (5) and a limiting cover (6), wherein a first limiting groove (421) is formed in the outer side wall of the valve rod (42), a second limiting groove (31) is formed in the outer end face of the valve cover (3), the second limiting groove (31) is annularly arranged on the periphery of the first limiting groove (421), the retainer ring (5) is simultaneously accommodated in the first limiting groove (421) and the second limiting groove (31), the limiting cover (6) is sleeved outside the valve rod (42) and is fixedly connected to the outer end face of the valve cover (3), and the limiting cover (6) is abutted against the retainer ring (5).

10. A filter according to any one of claims 1-5, characterized in that the valve stem (42) is screwed with the valve cap (3) or the valve seat (41), the valve stem (42) being fixedly connected with the valve flap (43).

11. The filter according to any one of claims 1-5, further comprising a nut and a hand wheel (45), said nut being threadedly mounted on an end of said valve stem (42) located outside said valve cap (3), said hand wheel (45) being axially located outside said valve cap (3) and fixedly mounted outside said nut, said valve stem (42) being fixedly connected to said valve flap (43).