阅读说明：本技术 一种保压状态下可更换过滤网的y型过滤器 (Y type filter of removable filter screen under pressurize state ) 是由 李程伟 于 2021-01-29 设计创作，主要内容包括：本发明属于U型过滤器领域,尤其涉及一种保压状态下可更换过滤网的Y型过滤器,它包括阀体、滑塞、盖板、环套A、封盖筒、环套B、转轴B、涡簧B、滤网、圆环A,其中Y型阀体的沉淀段内密封滑动配合有滑塞,滑塞上具有允许水流通过的方孔；本发明中滑塞在更换清理滤网时在滤网带动下从阀体出口与进口之间的位置运动至阀体沉淀段处进行位置固定并对沉淀段进行封堵,同时盖板将滑塞上的方孔进行关闭,无需将管道中的水压泄掉,从而保证阀体在不泄压更换滤网过程中不发生漏水现象,实现在不对管道内的水进行泄压的同时对滤网进行清理更换的目的,提高滤网清理更换的效率。(The invention belongs to the field of U-shaped filters, and particularly relates to a Y-shaped filter with a replaceable filter screen in a pressure maintaining state, which comprises a valve body, a sliding plug, a cover plate, a ring sleeve A, a cover sealing cylinder, a ring sleeve B, a rotating shaft B, a volute spring B, a filter screen and a circular ring A, wherein the sliding plug is hermetically and slidably matched in a settling section of the Y-shaped valve body, and the sliding plug is provided with a square hole for allowing water flow to pass through; according to the invention, when the filter screen is replaced and cleaned, the sliding plug moves to the settling section of the valve body from the position between the outlet and the inlet of the valve body under the driving of the filter screen, so that the position is fixed and the settling section is blocked, and meanwhile, the square hole on the sliding plug is closed by the cover plate, so that the water pressure in the pipeline does not need to be discharged, the phenomenon of water leakage of the valve body in the process of replacing the filter screen without pressure release is ensured, the purpose of cleaning and replacing the filter screen while the water in the pipeline is not discharged is realized, and the efficiency of cleaning and replacing the filter screen is improved.)

1. The utility model provides a Y type filter of removable filter screen under pressurize state which characterized in that: the Y-shaped valve comprises a valve body, a sliding plug, a cover plate, a ring sleeve A, a sealing cover cylinder, a ring sleeve B, a rotating shaft B, a vortex spring B, a filter screen and a circular ring A, wherein the sliding plug is hermetically and slidably matched in a settling section of the Y-shaped valve body, and the sliding plug is provided with a square hole for allowing water flow to pass through; a cover plate for opening and closing the square hole is arranged in the square hole; a ring sleeve A with the same central axis is rotationally matched on the sliding plug; the thread on the outer cylindrical surface of the ring sleeve A is matched with the thread on the inner wall of the circular ring A arranged on the inner wall of the valve body settling section;

a sealing cover cylinder for sealing the settling section is in threaded fit with the settling section of the valve body, a ring sleeve B with the same central axis is arranged in the sealing cover cylinder, and a rotating shaft B is rotationally matched in the ring sleeve B; a volute spring B for rotationally resetting the rotating shaft B is arranged between the rotating shaft B and the ring sleeve B; a clamping block B arranged on the rotating shaft B is matched with a clamping block A arranged on the ring sleeve B; the tail end of the rotating shaft is provided with a detachable cylindrical filter screen with the same central axis;

the outer cylindrical surface of the ring sleeve A is provided with a common ring groove B, and four guide grooves B which are uniformly distributed in the circumferential direction on the cylindrical surface of the common ring groove B are respectively matched with four guide blocks B on the inner wall of the filter screen; the triangular bulge B on each guide block B is matched with the triangular bulge A on the inner wall of the corresponding guide groove B; the sliding plug is driven by the filter screen to slide the settling section of the valve body along with the separation of the filter screen from the settling section, and the square hole is closed by the cover plate to prevent water leakage; along with the filter screen is installed in the section of deposiing, the sliding plug resets under the filter screen drives, and the apron is opened the square hole.

2. The pressure maintaining Y-filter of claim 1, wherein said filter screen is replaceable: a casing is embedded on the settling section of the valve body in a threaded manner, and the circular ring A is arranged on the inner wall of the casing; the end surface of the settling section of the valve body is matched with a sealing gasket arranged on the end surface of the circular ring A; the sealing cover cylinder is in threaded fit with the sleeve, a circular ring B is mounted on the inner wall of the sleeve, and the end face of the sealing cover cylinder is matched with a sealing gasket mounted on the circular ring B.

3. The pressure maintaining Y-filter of claim 1, wherein said filter screen is replaceable: the sliding plug is symmetrically provided with two guide blocks A which slide in two guide grooves A which are arranged on the inner wall of the valve body and communicated with the end surface of the precipitation section respectively; a trapezoidal guide ring is arranged on the ring sleeve A and rotates in a trapezoidal ring groove on the end face of the sliding plug; the end surface of the ring sleeve A is matched with a sealing gasket arranged on the end surface of the circular ring B.

4. The pressure maintaining Y-filter of claim 1, wherein said filter screen is replaceable: the end surface of the sealing cover cylinder is provided with a hexagonal boss A matched with a wrench; the fixture block A and the fixture block B are both positioned in a common ring groove D on the inner wall of the ring sleeve B, and the fixture block A is arranged on the inner wall of the common ring groove D; the volute spring B is nested on the rotating shaft B and is positioned in a common ring groove C on the inner wall of the ring sleeve B; one end of the volute spring B is connected with the rotating shaft B, and the other end of the volute spring B is connected with the inner wall of the common ring groove C; a bearing plate is arranged at one end of the rotating shaft B, and a hexagonal boss B matched with a hexagonal hole in the middle of the end face of the filter screen is arranged in the middle of the bearing plate; the hexagonal boss B is provided with a threaded column, and the threaded column is in threaded fit with an internal thread sleeve which tightly presses the filter screen on the bearing plate.

5. The pressure maintaining Y-filter of claim 1, wherein said filter screen is replaceable: the cover plate is arranged in the square hole through a rotating shaft A, and two ends of the rotating shaft A are in rotating fit with the sliding plug; two vortex springs A for resetting the rotating shaft A relative to the sliding plug in a swinging manner are symmetrically arranged at two ends of the rotating shaft A; the volute spring A is positioned in a common ring groove A on the sliding plug; one end of the volute spring A is connected with the inner wall of the common ring groove A, and the other end of the volute spring A is connected with the rotating shaft A; the edge of the periphery of the cover plate is provided with a sealing ring which is in sealing fit with the inner wall of the square hole; a limiting block for limiting the swing amplitude of the cover plate is arranged in the square hole; an L-shaped deflector rod for driving the cover plate to open the square hole is arranged on the inner wall of the valve body.

6. The pressure maintaining Y-filter of claim 1, wherein said filter screen is replaceable: the thread pitch of the thread on the outer cylindrical surface of the ring sleeve A is equal to that of the thread on the sealing cover cylinder.

Technical Field

The invention belongs to the field of U-shaped filters, and particularly relates to a Y-shaped filter with a replaceable filter screen in a pressure maintaining state.

Background

In the water circulation of a power plant, a Y-type filter is commonly used to filter impurities in water. The Y-shaped filter is widely used due to the advantages of advanced structure, small resistance, convenient pollution discharge and the like.

After the Y-type filter is used for a period of time, the filter screen in the Y-type filter is plugged due to the fact that the filter screen filters more accumulated impurities, and at the moment, the filter screen of the Y-type filter needs to be detached, cleaned and reinstalled. Before the filter screen is disassembled, the water pressure in the pipeline needs to be discharged, so that the filter screen is convenient to disassemble. However, the pressure relief takes longer due to the higher water pressure in the pipe, which results in a longer filter screen replacement period and a lower efficiency of filter screen cleaning and replacement.

Therefore, it is necessary to design a Y-filter that allows the filter screen to be directly removed and installed without venting the duct.

The invention designs a Y-shaped filter with a replaceable filter screen under a pressure maintaining state to solve the problems.

Disclosure of Invention

In order to solve the defects in the prior art, the invention discloses a Y-shaped filter with a replaceable filter screen in a pressure maintaining state, which is realized by adopting the following technical scheme.

In the description of the present invention, it should be noted that the terms "inside", "outside", "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention conventionally use, which are merely for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, or be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

A Y-shaped filter with a replaceable filter screen in a pressure maintaining state comprises a valve body, a sliding plug, a cover plate, a ring sleeve A, a sealing cover cylinder, a ring sleeve B, a rotating shaft B, a vortex spring B, a filter screen and a circular ring A, wherein the sliding plug is hermetically and slidably matched in a settling section of the Y-shaped valve body, and a square hole allowing water flow to pass through is formed in the sliding plug; a cover plate for opening and closing the square hole is arranged in the square hole; a ring sleeve A with the same central axis is rotationally matched on the sliding plug; the thread on the outer cylindrical surface of the ring sleeve A is matched with the thread on the inner wall of the circular ring A arranged on the inner wall of the valve body settling section.

A sealing cover cylinder for sealing the settling section is in threaded fit with the settling section of the valve body, a ring sleeve B with the same central axis is arranged in the sealing cover cylinder, and a rotating shaft B is rotationally matched in the ring sleeve B; a volute spring B for rotationally resetting the rotating shaft B is arranged between the rotating shaft B and the ring sleeve B; a clamping block B arranged on the rotating shaft B is matched with a clamping block A arranged on the ring sleeve B; the tail end of the rotating shaft is provided with a detachable cylindrical filter screen with the same central axis.

The outer cylindrical surface of the ring sleeve A is provided with a common ring groove B, and four guide grooves B which are uniformly distributed in the circumferential direction on the cylindrical surface of the common ring groove B are respectively matched with four guide blocks B on the inner wall of the filter screen; the triangular bulge B on each guide block B is matched with the triangular bulge A on the inner wall of the corresponding guide groove B; the sliding plug is driven by the filter screen to slide the settling section of the valve body along with the separation of the filter screen from the settling section, and the square hole is closed by the cover plate to prevent water leakage; along with the filter screen is installed in the section of deposiing, the sliding plug resets under the filter screen drives, and the apron is opened the square hole.

As a further improvement of the technology, a sleeve is nested on the settling section of the valve body in a threaded manner, and a circular ring A is arranged on the inner wall of the sleeve. When the sliding plug is worn to a certain extent after being used for a long time, the sliding plug can be pulled out of the settling section for replacement by screwing the sleeve off from the settling section and by the mutually screwed ring A and the ring sleeve A. The end surface of the settling section of the valve body is matched with a sealing gasket arranged on the end surface of the circular ring A; the sealing cover cylinder is in threaded fit with the sleeve, a circular ring B is mounted on the inner wall of the sleeve, and the end face of the sealing cover cylinder is matched with a sealing gasket mounted on the circular ring B.

As a further improvement of the technology, the sliding plug is symmetrically provided with two guide blocks A which respectively slide in two guide grooves A which are communicated with the end surface of the precipitation section on the inner wall of the valve body. The cooperation of guide block A and guide way A plays the location guide effect to the slip of sliding plug in the valve body. A trapezoidal guide ring is arranged on the ring sleeve A and rotates in a trapezoidal ring groove on the end face of the sliding plug. The matching of the trapezoid ring groove and the trapezoid guide ring ensures the rotary matching of the ring sleeve A on the end face of the sliding plug. The end surface of the ring sleeve A is matched with a sealing gasket arranged on the end surface of the circular ring B.

As a further improvement of the technology, the end face of the sealing cover cylinder is provided with a hexagonal boss A matched with a wrench; the fixture block A and the fixture block B are both positioned in a common ring groove D on the inner wall of the ring sleeve B, and the fixture block A is arranged on the inner wall of the common ring groove D; the volute spring B is nested on the rotating shaft B and is positioned in a common ring groove C on the inner wall of the ring sleeve B; one end of the volute spring B is connected with the rotating shaft B, and the other end of the volute spring B is connected with the inner wall of the common ring groove C; a bearing plate is arranged at one end of the rotating shaft B, and a hexagonal boss B matched with a hexagonal hole in the middle of the end face of the filter screen is arranged in the middle of the bearing plate; the hexagonal boss B is provided with a threaded column, and the threaded column is in threaded fit with an internal thread sleeve which tightly presses the filter screen on the bearing plate.

As a further improvement of the technology, the cover plate is arranged in the square hole through a rotating shaft A, and two ends of the rotating shaft A are in rotating fit with the sliding plug; two vortex springs A for resetting the rotating shaft A relative to the sliding plug in a swinging manner are symmetrically arranged at two ends of the rotating shaft A; the volute spring A is positioned in a common ring groove A on the sliding plug; one end of the volute spring A is connected with the inner wall of the common ring groove A, and the other end of the volute spring A is connected with the rotating shaft A; the edge of the periphery of the cover plate is provided with a sealing ring which is in sealing fit with the inner wall of the square hole; a limiting block for limiting the swing amplitude of the cover plate is arranged in the square hole; an L-shaped deflector rod for driving the cover plate to open the square hole is arranged on the inner wall of the valve body.

As a further improvement of the technology, the thread pitch of the thread on the outer cylindrical surface of the ring sleeve A is equal to that of the thread on the sealing cover cylinder, so that when the filter screen is disassembled, the sealing cover cylinder is enabled to rotate away from the sleeve, and meanwhile, the ring sleeve A which starts to rotate with the ring A is driven to synchronously move axially through the volute spring B, the rotating shaft B, the bearing plate, the hexagonal boss B, the thread column, the internal thread sleeve, the filter screen, the guide block B, the triangular boss B and the triangular boss A which are in a compressed state, so that the interference jamming phenomenon is not formed.

Compared with the traditional Y-shaped filter, the sliding plug moves from the position between the outlet and the inlet of the valve body to the settling section of the valve body under the driving of the filter screen when the filter screen is replaced and cleaned, so that the settling section is fixed in position and blocked, meanwhile, the square hole in the sliding plug is closed by the cover plate, the water pressure in a pipeline does not need to be discharged, the valve body is ensured not to leak water in the process of replacing the filter screen without pressure release, the purpose of cleaning and replacing the filter screen while the water in the pipeline is not released is realized, and the efficiency of cleaning and replacing the filter screen is improved. The invention has simple structure and better use effect.

Drawings

Fig. 1 is an overall schematic view of the present invention.

Fig. 2 is an overall sectional view of the present invention.

FIG. 3 is a schematic cross-sectional view of the lever, cover plate, sliding plug, ring cover A and filter.

Fig. 4 is a schematic sectional view of the settling section and casing fitting.

FIG. 5 is a schematic cross-sectional view of the combination of a capping cartridge, a ring sleeve B, a rotating shaft B, a bearing plate, a hexagonal boss B, a threaded post, an internal threaded sleeve and a filter screen.

FIG. 6 is a cross-sectional view of the shaft B, the coil spring B and the ring sleeve B.

FIG. 7 is a cross-sectional view of the rotation shaft B, the latch A and the ring sleeve B.

FIG. 8 is a schematic cross-sectional view of the mating of the spool and valve body.

Fig. 9 is a schematic cross-sectional view of the rotation axis a and the sliding plug in two different views.

Fig. 10 is a schematic cross-sectional view of a valve body and its valve body.

Fig. 11 is a cross-sectional view of the cap cylinder engaging the ring B.

Fig. 12 is a schematic cross-sectional view of a spool and its spool.

Figure 13 is a schematic view of loop a and its cross-section.

Fig. 14 is a schematic view of the guide block B.

FIG. 15 is a cross-sectional schematic view of a cross-joint from two perspectives.

Number designation in the figures: 1. a valve body; 2. an inlet; 3. an outlet; 4. a precipitation section; 5. a guide groove A; 6. a sliding plug; 7. a square hole; 8. a trapezoidal ring groove; 9. a common ring groove A; 10. a rotating shaft A; 11. a volute spring A; 12. a cover plate; 13. a seal ring; 14. a limiting block; 15. a ring sleeve A; 16. a common ring groove B; 17. a guide groove B; 18. a triangular bulge A; 19. a trapezoidal guide ring; 20. a deflector rod; 21. a sleeve; 22. a circular ring A; 23. a gasket; 24. a circular ring B; 25. a guide block B; 26. a triangular protrusion B; 27. a capping cartridge; 28. a hexagonal boss A; 29. a ring sleeve B; 30. a common ring groove C; 31. a common ring groove D; 32. a rotating shaft B; 33. a volute spring B; 34. a clamping block B; 35. a clamping block A; 37. a support plate; 38. a hexagonal boss B; 39. a threaded post; 40. an internal thread sleeve; 41. filtering with a screen; 42. a hexagonal hole; 43. and a guide block A.

Detailed Description

The drawings are schematic illustrations of the implementation of the present invention to facilitate understanding of the principles of structural operation. The specific product structure and the proportional size are determined according to the use environment and the conventional technology.

As shown in fig. 1, 2 and 3, it comprises a valve body 1, a sliding plug 6, a cover plate 12, a ring sleeve a15, a cover cylinder 27, a ring sleeve B29, a rotating shaft B32, a volute spring B33, a filter screen 41 and a circular ring a22, wherein as shown in fig. 2, 3 and 12, the sliding plug 6 is hermetically and slidably matched in the settling section 4 of the Y-shaped valve body 1, and the sliding plug 6 is provided with a square hole 7 for allowing water flow to pass through; as shown in fig. 3, 8 and 12, a cover plate 12 for opening and closing the square hole 7 is installed in the square hole; a ring sleeve A15 which is matched with the sliding plug 6 in a rotating way and has the same central axis; as shown in fig. 2, 3 and 4, the thread on the outer cylindrical surface of the ring sleeve a15 is matched with the thread on the inner wall of the circular ring a22 arranged on the inner wall of the settling section 4 of the valve body 1.

As shown in fig. 2, 5 and 11, a sealing cover cylinder 27 for sealing the settling section 4 is in threaded fit with the settling section 4 of the valve body 1, a ring sleeve B29 with the same central axis is installed in the sealing cover cylinder 27, and a rotating shaft B32 is rotationally matched in the ring sleeve B29; as shown in fig. 5 and 6, a volute spring B33 for resetting the rotation of the rotating shaft B32 is arranged between the rotating shaft B32 and the ring sleeve B29; as shown in fig. 5 and 7, the latch B34 mounted on the rotating shaft B32 is matched with the latch a35 mounted on the ring sleeve B29; as shown in fig. 2 and 5, the end of the rotating shaft is provided with a detachable cylindrical filter screen 41 with the same central axis.

As shown in fig. 3, 13 and 14, the outer cylindrical surface of the ring sleeve a15 is provided with a common ring groove B16, and four guide grooves B17 uniformly distributed in the circumferential direction on the cylindrical surface of the common ring groove B16 are respectively matched with four guide blocks B25 on the inner wall of the filter screen 41; as shown in fig. 3, 13 and 15, the triangular projection B26 of each guide block B25 is engaged with the triangular projection a18 of the inner wall of the corresponding guide groove B17; as shown in fig. 2, 3 and 5, as the filter screen 41 is detached from the settling section 4, the sliding plug 6 slides the settling section 4 of the valve body 1 to the sliding plug 6 under the driving of the filter screen 41, and the cover plate 12 closes the square hole 7 to prevent water leakage; with the filter screen 41 installed in the settling section 4, the sliding plug 6 is reset by the filter screen 41, and the cover plate 12 opens the square hole 7.

As shown in fig. 2, 4 and 5, the settling section 4 of the valve body 1 is threadedly nested with the sleeve 21, and the circular ring a22 is mounted on the inner wall of the sleeve 21. As shown in fig. 2, 3 and 4, when the sliding plug 6 is worn to some extent after a long period of use, it can be replaced by unscrewing the sleeve 21 from the settling section 4 and pulling the sliding plug 6 out of the settling section 4 by the ring a22 and the ring a15 which are screwed together. The end surface of the settling section 4 of the valve body 1 is matched with a sealing gasket 23 arranged on the end surface of a circular ring A22; the cover cylinder 27 is in threaded fit with the sleeve 21, a circular ring B24 is installed on the inner wall of the sleeve 21, and the end face of the cover cylinder 27 is matched with a sealing gasket 23 installed on a circular ring B24.

As shown in fig. 8 and 10, two guide blocks a43 are symmetrically mounted on the sliding plug 6, and two guide blocks a43 slide in two guide grooves a5 on the inner wall of the valve body 1 and communicated with the end face of the settling section 4. The engagement of the guide block a43 with the guide groove a5 plays a role in positioning and guiding the sliding of the spool 6 in the valve body 1. As shown in fig. 3, 12 and 13, the ring cover a15 is provided with a trapezoidal guide ring 19, and the trapezoidal guide ring 19 rotates in the trapezoidal ring groove 8 on the end face of the sliding plug 6. The engagement of the trapezoidal ring groove 8 with the trapezoidal guide ring 19 ensures the rotational engagement of the ring sleeve a15 on the end face of the sliding plug 6. As shown in fig. 3 and 4, the end face of the ring sleeve a15 is fitted with a seal 23 mounted on the end face of the ring B24.

As shown in fig. 2, 5 and 11, the end face of the capping cylinder 27 has a hexagonal boss a28 for engaging with a wrench; as shown in fig. 7 and 11, the fixture block a35 and the fixture block B34 are both located in the common ring groove D31 on the inner wall of the ring sleeve B29, and the fixture block a35 is mounted on the inner wall of the common ring groove D31; as shown in fig. 5, 6 and 11, the volute spring B33 is nested on the rotating shaft B32, and the volute spring B33 is located in a common ring groove C30 on the inner wall of the ring sleeve B29; one end of the volute spring B33 is connected with the rotating shaft B32, and the other end is connected with the inner wall of the common ring groove C30; a bearing plate 37 is arranged at one end of the rotating shaft B32, and a hexagonal boss B38 matched with a hexagonal hole 42 in the middle of the end face of the filter screen 41 is arranged in the middle of the bearing plate 37; hexagonal boss B38 has a threaded post 39, and threaded post 39 is threadably engaged with an internally threaded sleeve 40 that tightly presses screen 41 against retainer plate 37.

As shown in fig. 3, 9 and 12, the cover plate 12 is installed in the square hole 7 through a rotating shaft a10, and both ends of the rotating shaft a10 are rotatably engaged with the sliding plug 6; two ends of the rotating shaft A10 are symmetrically provided with two vortex springs A11 which can swing and reset relative to the sliding plug 6; the volute spring A11 is positioned in a common ring groove A9 on the sliding plug 6; one end of the volute spring A11 is connected with the inner wall of the common ring groove A9, and the other end is connected with the rotating shaft A10; a sealing ring 13 which is in sealing fit with the inner wall of the square hole 7 is arranged at the peripheral edge of the cover plate 12; a limiting block 14 for limiting the swing amplitude of the cover plate 12 is arranged in the square hole 7; an L-shaped deflector rod 20 for driving the cover plate 12 to open the square hole 7 is arranged on the inner wall of the valve body 1.

As shown in fig. 2, 3 and 5, the thread pitch of the thread on the outer cylindrical surface of the ring sleeve a15 is equal to the thread pitch of the cover cylinder 27, so that when the filter screen 41 is removed, the cover cylinder 27 is rotated away from the sleeve 21, and simultaneously the ring sleeve a15 which is engaged with the ring a22 is driven to synchronously move axially by the scroll spring B33, the rotating shaft B32, the supporting plate 37, the hexagonal boss B38, the threaded post 39, the internal threaded sleeve 40, the filter screen 41, the guide block B25, the triangular boss B26 and the triangular boss a18 which are in a compressed state, so that interference jamming phenomenon is not caused.

The threads on the outer cylindrical surface of the ring sleeve A15 and the threads on the sealing barrel 27 are both provided with rubber coatings, so that the sealing performance of the threaded matching of the ring sleeve A15 and the circular ring A22 and the sealing performance of the threaded matching of the sealing barrel 27 and the sleeve 21 are ensured. When the sleeve 21 is installed on the precipitation section 4 on the valve body 1, the threads on the outer cylindrical surface of the precipitation section 4 are coated with glass cement, so that the tightness of the threaded matching between the sleeve 21 and the precipitation section 4 is ensured.

The working process of the invention is as follows: in the initial state, the sliding plug 6 is located at the necessary part of the water flow between the inlet 2 and the outlet 3 of the valve body 1, the deflector rod 20 interacts with the cover plate 12, the cover plate 12 is in an open state for the square hole 7 on the sliding plug 6, and the filter screen 41 is in a state of filtering the water flow between the inlet 2 and the outlet 3 of the valve body 1. The water flows through the inlet 2, the square hole 7 of the sliding plug 6, the filter screen 41 and the outlet 3. The end of the filter screen 41 is nested on the common ring groove B16 of the ring sleeve A15, the four guide blocks B25 on the inner wall of the filter screen 41 are respectively positioned in the four guide grooves B17 on the cylindrical surface of the common ring groove B16 of the ring sleeve A15, and the triangular protrusion B26 on each guide block B25 interacts with the triangular protrusion A18 on the inner wall of the corresponding guide groove B17 to lock the relative axial positions of the filter screen 41 and the ring sleeve A15. The cover cylinder 27 is screwed with the sleeve 21, the scroll spring B33 is in a compression energy storage state, and the fixture block A35 is in contact and abutted with the fixture block B34. The maximum axial spacing between the ring sleeve and the ring a 22. The volute spring A11 is in a compressed energy storage state. The ends of the lead block B are spaced apart from the tops of the corresponding guide grooves B17 by a small distance.

After the present invention is used for a long time, more precipitated impurities are accumulated in the filter screen 41 and block the water flow passage, and the filter screen 41 needs to be cleaned and replaced. When the filter screen 41 is cleaned and replaced, the sealing cylinder 27 is rotated by the interaction of a wrench and the hexagonal boss a28 at the end of the sealing cylinder 27, the sealing cylinder 27 gradually and axially rotates away from the casing 21, the end face of the sealing cylinder 27 is separated from the sealing gasket 23 on the circular ring B24, the sealing cylinder 27 drives the ring sleeve B29 to synchronously rotate, the rotating shaft B32 drives the filter screen 41 to synchronously rotate and axially move through the bearing plate 37, the hexagonal boss B38, the threaded column 39 and the internal threaded sleeve 40 under the driving of the compressed vortex spring B33, the filter screen 41 drives the ring sleeve a15 to synchronously rotate and axially move through the four guide blocks B25, the triangular boss B26 and the four triangular bosses a18, and the ring sleeve a15 rotates relative to the sliding plug 6 and drives the sliding plug 6 to synchronously and axially move towards the opening of the settling section 4. The lever 20 gradually releases the locking state of the open state of the cover 12, and the cover 12 gradually closes the square hole 7 around the rotation axis a10 by the action of the scroll spring a 11.

As the cap cartridge 27 continues to rotate, the cap cartridge 27 remains disengaged from the sleeve 21 and is in a threaded condition as the threads on the outer cylindrical surface of the ring A15 begin to thread with the threads on the inner wall of the ring A22. When the end face of the ring sleeve A15 meets the sealing gasket 23 on the ring B24, the sealing cylinder 27 is still in a screwing state with the sleeve 21 and the sealing cylinder 27 is continuously screwed, the ring sleeve A15 presses the sealing gasket 23 under the action of the ring A22 screwed with the ring sleeve A, and the sealing gasket 23 deforms to seal the matching gap between the ring sleeve A15 and the ring B24. When the cover cylinder 27 is screwed off the sleeve 21 and the screwing with the sleeve 21 is finished, the ring A15 presses the corresponding sealing pad 23 to the limit.

During the movement of the sliding plug 6, when the cover plate 12 is completely separated from the shift lever 20, the cover plate 12 is completely separated from the shift lever 20 and completely closes the square hole 7 on the sliding plug 6 under the action of the two scroll springs a11, and the cover plate 12 abuts against the stopper 14 in the square hole 7.

When the cover cylinder 27 is completely separated from the casing 21, the cover cylinder 27 is pulled axially outwards, the cover cylinder 27 drives the filter screen 41 to be separated from the ring sleeve a15 through a series of transmissions, in the process that the filter screen 41 is separated from the ring sleeve a15, the triangular protrusions B26 on the four guide blocks B25 interact with the triangular protrusions a18 in the four guide grooves B17, so that the filter screen 41 is subjected to self-adaptive elastic deformation, and the triangular protrusions B26 on the four guide blocks B25 pass over the triangular protrusions a18 in the four guide grooves B17 and finally completely separate from the ring sleeve a15 under the condition that the filter screen 41 is pulled axially outwards towards the precipitation section 4. When the filter screen 41 is completely separated from the ring sleeve a15, the elastic deformation of the filter screen 41 automatically restores, and finally the filter screen 41 is disassembled. During the process of disassembling the filter screen 41 and after the filter screen 41 is disassembled, the water pressure in the pipeline still communicated with the valve body 1 does not need to be discharged, and the sliding plug 6 with the square hole 7 sealed and closed by the cover plate 12 blocks the settling section 4, so that the water leakage phenomenon can not be generated. Because the filter screen 41 is dismantled, need not to carry out the pressure release to the water in the pipeline, so improved the clearance replacement efficiency of filter screen 41 widely.

After the filter screen 41 is washed and cleaned, the sealing cylinder 27 is held by hand to plug the filter screen 41 into the settling section 4, when the end of the filter screen 41 reaches the ring sleeve, if the four guide blocks B25 are right opposite to the four guide grooves B17, the sealing cylinder 27 is pushed axially inwards continuously, and the sealing cylinder 27 drives the filter screen 41 to be nested on the ring sleeve a15 through a series of transmission. When the triangular protrusions B26 of the four guide blocks B25 meet the triangular protrusions a18 of the four guide grooves B17, the filter screen 41 is also elastically deformed. When the triangular protrusions B26 of the four guide blocks B25 simultaneously pass over the triangular protrusions a18 of the four guide grooves B17 and are restored with respect to the ring sleeve a15, respectively, the elastic deformation of the screen 41 is automatically restored and the operation of nesting the screen 41 onto the ring sleeve a15 is completed.

If the four guide blocks B25 are not exactly opposite to the four guide grooves B17, respectively, the capping cylinder 27 is rotated, the capping cylinder 27 drives the filter screen 41 to rotate synchronously through a series of transmissions, the four guide blocks B25 are not exactly opposite to the four guide grooves B17, respectively, the capping cylinder 27 is pushed axially inward, the capping cylinder 27 drives the filter screen 41 to be nested on the ring sleeve a15 through a series of transmissions, and finally, the operation of nesting and mounting the filter screen 41 on the ring sleeve a15 is completed.

Then, the sealing cylinder 27 is rotated reversely, the sealing cylinder 27 drives the filter screen 41 to rotate synchronously through the fixture block a35, the fixture block B34, the rotating shaft B32, the supporting plate 37, the hexagonal boss B38, the threaded column 39 and the internal threaded sleeve 40, and the filter screen 41 drives the ring sleeve a15 to rotate synchronously and reversely relative to the sliding plug 6 through the four guide blocks B25, the four triangular protrusions B26, the four guide grooves B17 and the four triangular protrusions a 18. The ring a15 starts to rotate away from the ring a22 and moves axially towards its initial position, and the ring a15 drives the sliding plug 6 which is rotationally engaged with it to move axially synchronously. When the threads on closure cartridge 27 are brought into register and threaded on sleeve 21, screen 41 and collar a15 move axially relative to each other a slight distance to accommodate the axial movement of collar a15 when the threads on closure cartridge 27 are not threaded on sleeve 21, and the ends of wire guide block B are again spaced slightly from the tops of corresponding guide slots B17. When the capping cartridge 27 and the sleeve 21 begin to rotate, the capping cartridge 27 begins to rotate and move axially in unison with the collar a15, since the pitch of the threads on the outer cylindrical surface of the collar a15 is equal to the pitch of the threads on the capping cartridge 27. As the ring bush a15 drives the sliding plug 6 to move towards the initial position in the valve body 1, the ring bush a15 gradually releases the compression on the sealing pad 23 on the ring B24 and gradually moves away from the ring B24.

When the cover cylinder 27 is reversely rotated to the limit and can not be rotated any more, the screwing of the cover cylinder 27 and the sleeve reaches the limit, the cover cylinder 27 drives the sliding plug 6 to return to the initial position in the valve body 1 again through a series of transmission, the cover plate 12 is rotated by the driving lever 20 to open the square hole 7 around the rotating shaft A10 completely, the filter screen 41 plays a role of filtering water flow between the inlet 2 and the outlet 3 in the valve body 1 again, and the installation of the filter screen 41 is finished.

When it is desired to replace the screen 41, it is only necessary to unscrew the internally threaded sleeve 40 from the threaded post 39, to mount a new screen 41 on the support plate 37 and to tighten the internally threaded sleeve 40 onto the threaded post 39 again.

In conclusion, the beneficial effects of the invention are as follows: according to the invention, when the filter screen 41 is replaced and cleaned, the sliding plug 6 is driven by the filter screen 41 to move from the position between the outlet 3 and the inlet 2 of the valve body 1 to the position of the settling section 4 of the valve body 1 for fixing and plugging the settling section 4, and meanwhile, the square hole 7 on the sliding plug 6 is closed by the cover plate 12, so that water pressure in a pipeline does not need to be drained, the phenomenon of water leakage is avoided when the filter screen 41 is replaced without pressure relief of the valve body 1, the purpose of cleaning and replacing the filter screen 41 while the water in the pipeline is not drained is realized, and the cleaning and replacing efficiency of the filter screen 41 is improved.