CN106195437A

CN106195437A - Filter screen

Info

Publication number: CN106195437A
Application number: CN201610763160.0A
Authority: CN
Inventors: 张玉莲
Original assignee: Individual
Current assignee: Zhejiang Jinlong Copper Co Ltd
Priority date: 2016-08-29
Filing date: 2016-08-29
Publication date: 2016-12-07
Anticipated expiration: 2036-08-29
Also published as: CN106195437B

Abstract

The present invention relates to a kind of filter screen.It is applied to drain valve, this drain valve includes valve body, this valve body is provided with water inlet, outlet and extends to the water stream channel of outlet from water inlet, being provided with in valve body and be on water stream channel the filter screen allowing water to pass through for intercepting solids, this filter screen includes filter screen outer ring, the filter screen inner ring that is enclosed in filter screen outer ring and the dictyosome of band mesh being located between filter screen outer ring and filter screen inner ring；Being provided with filter screen support lug in this valve body, this filter screen is inserted in valve body from the water inlet of valve body, and when filter screen outer ring offsets with filter screen support lug, filter screen is supported in filter screen support lug.The present invention is by installing the filter screen of a simple in construction to intercept solids to concentrate on filter screen by solids in valve body, it is to avoid solids flees hither and thither, and reduces the risk of blocking, improves service life.

Description

Filter screen

Technical Field

The invention relates to a drain valve mainly used on sanitary and bathroom equipment such as a wash basin, a bathtub and the like, in particular to a filter screen of the drain valve.

Background

In the prior art, a drain valve used for sanitary equipment such as a washbasin and a bathtub is generally a push-type telescopic valve, and comprises a valve body, a valve core and a telescopic mechanism. After the drainage valve is used for a period of time, solid matters (particularly human hair) are deposited in the valve body, so that a water flow channel in the valve body is blocked, and drainage is not smooth. Even too much human hair is hung in the valve core and/or the telescopic mechanism to cause the problems that the valve core cannot move telescopically, or the telescopic mechanism fails, and the like, and the service life is shortened.

Disclosure of Invention

The invention aims to provide a filter screen which is applied to a drain valve to prolong the service life of the drain valve.

The above purpose is realized by the following technical scheme:

a filter screen is applied to a drain valve, the drain valve comprises a valve body, the valve body is provided with a water inlet, a water outlet and a water flow channel extending from the water inlet to the water outlet, a filter screen which is positioned on the water flow channel and used for intercepting solids and allowing water to pass is arranged in the valve body, and the filter screen comprises a filter screen outer ring, a filter screen inner ring enclosed in the filter screen outer ring and a screen body with meshes arranged between the filter screen outer ring and the filter screen inner ring; the valve body is internally provided with a filter screen supporting flange, the filter screen is placed into the valve body from the water inlet of the valve body, and when the outer ring of the filter screen is abutted against the filter screen supporting flange, the filter screen is supported on the filter screen supporting flange.

According to the invention, the filter screen with a simple structure is arranged in the valve body to intercept solid objects (especially human hair) so as to concentrate the solid objects on the filter screen, so that the solid objects are prevented from flowing everywhere, the risk of blockage is reduced, and the service life is prolonged.

Drawings

Fig. 1 is a schematic perspective view showing a drain valve to which the present invention is applied, in which a valve cartridge is in an open position; fig. 2 is a schematic sectional view showing a drain valve to which the present invention is applied, in which a valve cartridge is in an open position; fig. 3 is a schematic perspective view showing a discharge valve to which the present invention is applied, in which a valve cartridge is in a closed position; fig. 4 is a schematic sectional view showing a drain valve to which the present invention is applied, in which a valve cartridge is in a closed position; fig. 5 shows a schematic exploded perspective view of a discharge valve to which the present invention is applied; fig. 6 is a perspective exploded view illustrating a valve cartridge and a strainer of a drain valve to which the present invention is applied; fig. 7 is a perspective exploded view illustrating another angle of a valve cartridge and a strainer of a drain valve to which the present invention is applied; fig. 8 is a schematic sectional view showing a valve cartridge and a strainer of a drain valve to which the present invention is applied, in which the valve cartridge and the strainer are disassembled; fig. 9 is a perspective exploded view showing a valve body and a sealing ring of a drain valve to which the present invention is applied; fig. 10 is a perspective exploded view showing another angle of a valve body and a sealing ring of the drain valve to which the present invention is applied; fig. 11 is a schematic sectional view showing a valve body and a sealing ring of a drain valve to which the present invention is applied, in which the valve body and the sealing ring are disassembled; fig. 12 is an exploded perspective view showing a telescopic mechanism of a drain valve to which the present invention is applied; fig. 13a shows a schematic cross-sectional view of the telescopic mechanism of the drain valve to which the present invention is applied, in which the movable pin is stopped at an intermediate position on the lower groove side of the upper guide section; FIG. 13b is a schematic cross-sectional view of the telescoping mechanism of the drain valve of the present invention in use, wherein the movable pin is in the side groove; fig. 14 is a schematic sectional view showing a telescopic mechanism of a water discharge valve to which the present invention is applied, in which the telescopic mechanism is disassembled; fig. 15 is a schematic front view showing a base of a telescopic rod of the drain valve to which the present invention is applied; fig. 16a shows a first principle view of the operation of the telescopic mechanism of the drain valve to which the present invention is applied, in which the movable pin is located in the side groove but not against the groove bottom of the side groove; fig. 16b shows a second principle of operation of the telescopic mechanism of the discharge valve to which the invention is applied, in which the movable pin is in the lower guide section and against the third inclined section; FIG. 16c is a third operational schematic of the telescoping mechanism of the drain valve with the present invention in use, wherein the movable pin enters the head end of the upstroke; fig. 16d shows a fourth principle view of the operation of the telescopic mechanism of the drain valve to which the present invention is applied, wherein the movable pin abuts against the first arc segment; fig. 16e shows a fifth schematic diagram of the operation of the telescopic mechanism of the drain valve to which the present invention is applied, wherein the movable pin is dropped from a position abutting against the first arc section to the lower groove side of the upper guide section, and the movable pin is abutted against the lower groove side of the upper guide section; fig. 16f shows a sixth operating principle of the telescopic mechanism of the drain valve to which the present invention is applied, in which the movable pin is stopped at an intermediate position on the lower groove side of the upper guide section; fig. 16g shows a seventh schematic diagram of the operation of the telescopic mechanism of the drain valve according to the present invention, wherein the movable pin moves from the middle position resting on the lower groove side of the upper guide section to the second inclined section, and the movable pin abuts against the second inclined section; fig. 16h shows an operational principle diagram eight of the telescopic mechanism of the drain valve to which the present invention is applied, in which the movable pin abuts against the second arc segment; fig. 16i shows a ninth operational principle diagram of the telescopic mechanism of the drain valve to which the present invention is applied, in which the movable pin is moved to the end of the descending section; fig. 16j shows a functional diagram ten of the telescopic mechanism of the drain valve to which the present invention is applied, in which the movable pin is moved to the side groove inlet/outlet; fig. 16k shows an eleventh operational schematic diagram of the telescopic mechanism of the drain valve in which the movable pin is located in the side groove and the movable pin abuts against the bottom of the side groove; FIG. 17 shows a cross-sectional view taken along line A-A of FIG. 2 with the spool projection abutting the mis-alignment stop, the spool projection and the mis-alignment stop being shown in phantom; FIG. 18 shows a cross-sectional view taken along line B-B of FIG. 2 with the spool projection abutting the offset detent stop; FIG. 19 shows a schematic view after the valve core has been rotated 90 in a counterclockwise direction based on FIG. 17; FIG. 20 is a schematic view of the valve core rotated 90 in a counterclockwise direction based on FIG. 18; fig. 21 is a perspective view showing a third cylinder of the water discharge valve to which the present invention is applied.

The specific implementation mode is as follows:

a drain valve as shown in fig. 1 to 21 includes a valve body 10, a valve core 20, and a telescopic mechanism 30;

the valve body 10 is provided with a water inlet 101, a water outlet 102 and a water flow channel 103 extending from the water inlet 101 to the water outlet 102;

the telescopic mechanism 30 is installed in the valve body 10, in this embodiment, the telescopic mechanism 30 is located on the water flow channel 103;

the valve core comprises a core shaft and a gland 201 which can be pressed by a user, one end of the core shaft is connected with the gland 201, the other end of the core shaft is inserted into the valve body 10 from the water inlet 101 and is connected with the telescopic mechanism 30, and particularly, the lower end of the large-diameter section of the lower core shaft of the core shaft is inserted into the valve body 10 from the water inlet 101 and is connected with the telescopic mechanism 30;

when the gland 201 is pressed, the telescopic mechanism 30 drives the valve core to switch between an opening position and a closing position;

an opening and closing mechanism for selectively blocking or unblocking the water flow passage 103 is provided between the valve element 20 and the valve body 10;

when the water flow passage 103 is blocked, water is prohibited from being discharged from the valve body 10 through the discharge port 102;

when the water flow passage 103 is opened, water is allowed to be discharged from the valve body 10 through the discharge port 102;

when the valve core 20 is at the opening position, the opening and closing mechanism enables the water flow channel 103 to be unobstructed;

when the valve element 20 is in the closed position, the opening and closing mechanism blocks the water flow passage 103;

wherein, fig. 1 and 2 show that the valve core 20 is in the open position, the water flow passage 103 is unobstructed, and water is allowed to exit the valve body 10 through the outlet 102; fig. 3 and 4 show the valve cartridge 20 in the closed position, with the water flow passage 103 blocked and water inhibited from exiting the valve body through the outlet port 102;

a filter 40 is disposed in the valve body 10 on the water flow passage 103 for intercepting solid objects (e.g., particles, human hair, etc.) and allowing water to pass therethrough.

In particular, the strainer 40 is removably mounted within the valve body 10. This technical scheme is through setting up the filter screen into dismantled and assembled mode, is convenient for to the clearance of filter screen.

The filter screen 40 comprises a filter screen outer ring 401, a filter screen inner ring 402 enclosed in the filter screen outer ring 401, and a mesh body 403 arranged between the filter screen outer ring 401 and the filter screen inner ring 402, wherein the filter screen inner ring 402 is enclosed to form an inner ring perforation 404;

an annular filter screen support flange 104 is provided in the valve body 10, the filter screen 40 is inserted into the valve body 10 from the water inlet 101 of the valve body, and the filter screen 40 is supported by the filter screen support flange 104 when the filter screen outer ring 41 abuts against the filter screen support flange 104;

a clutch structure which can prevent or allow the valve core 20 to be drawn out of the valve body 10 is arranged between the valve core 20 and the valve body 10, and the clutch structure is switched between a combined state and a disassembled state;

when the clutch structure is in the combined state, the valve core 20 is prevented from being drawn out of the valve body 10;

when the clutch structure is in the disassembly state, the valve core 20 is allowed to be drawn out of the valve body 10;

the core shaft of the valve core can pass through the inner ring perforation 404 of the filter screen in a sliding way, the valve core 20 is provided with a lifting part positioned below the filter screen, the outer diameter D1 of the lifting part is larger than the diameter D2 of the inner ring perforation, so that when the valve core 20 is drawn out of the valve body 10, the lifting part can take the filter screen 40 out of the valve body 10. This technical scheme takes out the filter screen when taking out from the case, the dismantlement of filter screen of can being convenient for, in addition, because case (dabber promptly) is higher at the flexible movable frequency that switches between open position and closed position, through boring and the dabber design for sliding fit to inner circle for the dabber can filter screen activity relatively, can avoid case activity in-process to drive the filter screen to take place the motion and make the filter screen take place to shake like this, leads to the solid landing, and the filter screen is inefficacy.

When the gland 201 is twisted, the clutch structure is switched between the assembled state and the disassembled state. This technical scheme can be convenient for the manual gland that twists reverse of user and take out and dismantle the filter screen simultaneously from the case, is convenient for clear up the filter screen.

Specifically, the method comprises the following steps:

the clutch structure comprises a valve core locking plate 105 which is arranged in the valve body 10 and is annular and a valve core lug 202 arranged on a core shaft;

the valve core locking plate 105 is provided with a locking plate notch 106, and the valve core locking plate 106 is enclosed into a valve core through hole 107 for a mandrel (especially a lower mandrel 205) to pass through;

when the valve core convex block 202 is aligned with the lock plate notch 106, the valve core convex block 202 is allowed to pass through the valve core lock plate 105, and at the moment, the clutch structure is in a disassembly state;

when the valve core protrusion 202 and the locking plate notch 106 are dislocated, the valve core protrusion 202 is blocked by the valve core locking plate 105 and the valve core protrusion 202 is prohibited from passing through the valve core locking plate 105, and at the moment, the clutch structure is in a combined state;

when the mandrel (namely, the valve core) rotates, the valve core lug 202 is selectively aligned or dislocated with the locking plate notch 106, the mandrel and the gland 201 are relatively fixedly connected, and the gland 201 is twisted to drive the mandrel to rotate. The clutch disclosed by the technical scheme is simple in structure and convenient to implement.

The opening and closing mechanism includes a sealing plug 203 mounted on a core shaft of the valve core;

the core shaft of the valve core comprises an upper core shaft 204 and a lower core shaft 205;

the upper end 206 of the upper mandrel is detachably connected with the gland 201, and the lower end 207 of the upper mandrel is provided with an upper mandrel jack 208;

the upper mandrel 204 is slidably inserted through the inner ring perforations 404 of the screen such that the screen 40 is sleeved over the upper mandrel 204, the diameter D2 of the inner ring perforations being greater than or equal to the diameter D3 of the upper mandrel;

the lower mandrel 205 is in a stepped shaft shape and comprises a small-diameter section 209 and a large-diameter section 210, the lower end of the small-diameter section 209 is connected with the upper end of the large-diameter section 210, and a mandrel stepped surface 211 is formed at the connection part of the lower end of the small-diameter section 209 and the upper end of the large-diameter section 210;

the sealing plug 203 is provided with a sealing plug central hole 212, the upper end of the small diameter section 209 of the lower mandrel passes through the sealing plug central hole 212 and is inserted into the upper mandrel inserting hole 208 in a detachable mode, so that the sealing plug 203 is clamped between the lower end 207 of the upper mandrel and the mandrel step surface 211, and the sealing plug 203 is installed; the diameter D4 of the central hole of the sealing plug is larger than or equal to the diameter D5 of the small-diameter section of the lower core shaft, and the diameter D4 of the central hole of the sealing plug is smaller than the diameter D6 of the large-diameter section of the lower core shaft; the valve core protrusion 202 is disposed at the lower end of the large diameter section 210 of the lower spindle, and the valve core protrusion 202 extends along the radial direction of the large diameter section 210 of the lower spindle. This technical scheme can be convenient for the dismouting of case each part and sealing plug, is convenient for to the clearance of case each part and sealing plug. In this embodiment, the number of the spool protrusions 202 is 2, and the 2 spool protrusions 202 are symmetrically distributed on two sides of the lower spindle 205. The number of locking plate notches 106 is the same as the number of valve core lugs 202, that is, the number of locking plate notches 106 is 2, and the 2 locking plate notches 106 are symmetrically distributed on two sides of the inner ring through hole.

The upper end of the small diameter section 209 of the lower mandrel is in threaded fit with the upper mandrel jack 208;

the gland 201 is provided with a connecting column 213, the connecting column 213 is provided with a connecting column jack 214, and the upper end 206 of the upper mandrel is inserted into the connecting column jack 214 in a detachable mode;

the upper end 206 of the upper mandrel is threadably engaged with the connection post receptacle 214.

The opening and closing mechanism further includes a seal ring 50 installed in the valve body;

the sealing plug 203 comprises a plug body 215, the plug body 215 is a truncated cone with a diameter gradually increasing from the bottom surface 216 of the plug body to the top surface 217 of the plug body, the top surface 217 of the plug body is provided with a sealing plug flange 218 which extends along the radial direction of the plug body 215 and is annular, the sealing plug flange 218 is a lifting part, and the sealing plug central hole 212 extends from the bottom surface 216 of the plug body to the top surface 217 of the plug body so as to penetrate through the plug body 215;

the sealing ring 50 comprises a sealing ring main body 501 and a sealing ring flange 502, wherein the sealing ring main body 501 is annular, the sealing ring main body 501 extends along the radial direction of the sealing ring main body 501, the sealing ring main body 501 encloses a sealing ring through hole 503 into which the plugging body 215 can be inserted, and the diameter of the sealing ring through hole 503 is gradually reduced along the direction in which the plugging body 215 is inserted into the sealing ring through hole 503;

the direction from the bottom surface 216 of the plug body to the top surface 217 of the plug body is the direction in which the plug body 215 is pulled out of the seal ring penetration hole 503;

when the plugging body 215 is inserted into the sealing ring through hole 503, the sealing ring through hole 503 is plugged by the plugging body 215, the sealing ring flange 502 abuts against the sealing plug flange 218, and the valve core 20 is in a closed position;

when the plug body 215 is pulled out of the sealing ring penetration 503, the sealing ring penetration 503 is opened, the sealing ring flange 502 is separated from the sealing plug flange 218, and the valve element 20 is in the open position.

The lower mandrel 205 passes through the seal ring perforation 503.

This technical scheme is through filling in the body design for the diameter from filling in the bottom surface of the body toward the direction of filling in the top surface of the body the round platform body that increases gradually, to the structure that the perforation design of sealing ring reduces gradually for its diameter along the orientation of filling in the body and inserting this sealing ring perforation to the sealed cooperation effect of reinforcing, when filling in the body simultaneously and inserting the sealing ring perforation, the sealing ring flange offsets with the sealing plug flange, also can strengthen sealed effect.

The telescopic mechanism 30 comprises a shell 301, a telescopic rod 302, a compression spring 303, a limiting sleeve 304 and a movable pin 305;

the telescopic rod 302 comprises a base 306 and a push rod part 307 extending upwards from the top end face 363 of the base, wherein a base accommodating hole 309 extending inwards from the bottom end face 308 of the base 306 is formed in the base 306;

as shown in fig. 15, the side 310 of the base is provided with a track groove 311, the track groove 311 including a descending section 312, an ascending section 313 parallel to and spaced apart from the descending section 312, an upper guide section 316 connected between a tail end 314 of the ascending section and a head end 315 of the descending section, and a lower guide section 319 connected between a tail end 317 of the descending section and a head end 318 of the ascending section; one side of the lower guide section 319 is provided with a side groove 320 communicated with the lower guide section 319; wherein,

the upper slot side of the upper guide section 316 comprises a first inclined section 321, a transition section 322 and a second inclined section 323, the lower end 324 of the first inclined section connects to the end 314 of the upper section, the high end 325 of the first inclined section connects to the upper end 326 of the transition section, the lower end 327 of the transition section connects to the lower end 328 of the second inclined section, the high end 329 of the second inclined section connects to the head end 315 of the lower section;

the first inclined section 321 is parallel to the second inclined section 323, and the high end 325 of the first inclined section is equal to the high end 329 of the second inclined section;

the lower groove side 362 of the upper guide section opposite to the upper groove side of the upper guide section is in a fox shape with the left and right ends 330, 331 high and the middle position 332 low for the movable pin to stop; the right end 331 of the lower groove side of the upper guide section connects to the end 314 of the upper section, the left end 330 of the lower groove side of the upper guide section connects to the head 315 of the lower section;

the high end 325 of the first inclined section and the low end 328 of the second inclined section are both located above the lower groove side of the upper guide section, the high end 325 of the first inclined section and the low end 328 of the second inclined section are both located on the right side of the middle position 332 of the lower groove side of the upper guide section, and the high end 325 of the first inclined section and the low end 328 of the second inclined section are both located on the left side of the right end 331 of the lower groove side of the upper guide section;

the upper slot side of the lower guide section comprises an inner arc section 333 and a third inclined section 334, one end of the inner arc section 333 is connected with the tail end 317 of the lower section, the other end of the inner arc section 333 is connected with the low end 335 of the third inclined section, and the high end 336 of the third inclined section is connected with the head end 318 of the upper section;

the lower slot side of the lower guide section opposite the upper slot side of the lower guide section comprises an outer arcuate section 337 and a connecting section 338, the side slot 320 comprises a left slot side 339 of the side slot, a right slot side 340 of the side slot opposite the left slot side 339 of the side slot, a slot bottom 341 of the side slot, and a side slot access 342 opposite the slot bottom 341 of the side slot;

one end of the outer arc segment 337 is connected to the end 317 of the lower segment, the other end of the outer arc segment 337 is connected to the upper end 343 of the left slot side of the side slot, the lower end 344 of the left slot side of the side slot is connected to the left end 345 of the slot bottom of the side slot, the right end 346 of the slot bottom of the side slot is connected to the lower end 347 of the right slot side of the side slot, the upper end 348 of the right slot side of the side slot is connected to one end of the connecting segment 338, and the other end of the connecting segment 338 is connected to the head end 318 of the upper segment;

the side slot entrance/exit 342 is located at the junction of the lower guide section 319 and the side slot 320;

the side slot access 342 is located below the third sloped section 334, the lower end 335 of the third sloped section is located to the left of the side slot access 342, and the upper end 336 of the third sloped section is located to the right of the side slot access 342;

in this embodiment, the connecting section 338 is slanted, wherein the upper end 378 of the right slot side of the side slot is connected to the lower end 349 of the connecting section, and the upper end 350 of the connecting section is connected to the head end 318 of the upper row section;

the circle of the inner arc segment 333 is concentric with the circle of the outer arc segment 337;

the limiting sleeve 304 is hollow and has two open ends, the limiting sleeve 304 is slidably sleeved outside the base 306 of the telescopic rod, a strip-shaped limiting sleeve sliding groove 353 penetrating through the side wall of the limiting sleeve is arranged on the side wall 352 of the limiting sleeve, and the length direction of the limiting sleeve sliding groove 353 is perpendicular to the movement direction of the telescopic rod 302;

one end of the movable pin 305 penetrates through the limiting sleeve sliding groove 353 and extends into the track groove 311, the other end of the movable pin 305 is left in the limiting sleeve sliding groove 353, and the movable pin moves along the length direction of the limiting sleeve sliding groove 353 under the guidance of the limiting sleeve sliding groove 353;

a housing accommodating cavity 354 is formed in the housing 301, a housing opening 355 communicated with the housing accommodating cavity 354 is formed in the top of the housing 301, the stop collar 304 is installed in the housing accommodating cavity 354, the base 306 of the telescopic rod moves in the housing accommodating cavity 354, the outer end 356, far away from the base, of the push rod part of the telescopic rod extends out of the housing 301 from the housing opening 355, and the outer end 356 of the push rod part of the telescopic rod abuts against the lower end of the large-diameter section 210 of the lower mandrel;

the inner end of the push rod part of the telescopic rod opposite to the outer end of the push rod part of the telescopic rod is connected with the base 306;

the compression spring 303 is placed in the base receiving hole 309, one end of the compression spring 303 abuts against the hole bottom 357 of the base receiving hole, and the other end of the compression spring 303 abuts against the housing 301, particularly, the other end of the compression spring 303 abuts against the cavity bottom 358 of the housing receiving cavity;

a limit stop portion 359 is disposed in the housing accommodating cavity 354;

when the bottom end surface 308 of the base portion of the telescopic rod abuts against the limit stop portion 359, the telescopic rod 302 is at the maximum retraction position;

when the movable pin 305 abuts against the groove bottom 341 of the side groove, the telescopic rod 302 is at the maximum extending position;

the telescoping rod 302 moves between a maximum extended position and a maximum retracted position;

the high end 325 of the first inclined section is connected with the upper end 326 of the transition section through a first circular arc section 360, the high end 329 of the second inclined section is connected with the head end 315 of the descending section through a second circular arc section 361, and the radii of the circle where the first circular arc section 360 is located, the circle where the second circular arc section 361 is located and the movable pin 305 are equal;

when the movable pin 305 abuts against the first arc segment 360 or the second arc segment 361, the bottom end surface 308 of the base of the telescopic rod abuts against the limit stop 359; according to the technical scheme, the limit stop part 359 is arranged, so that when the movable pin abuts against the first arc section or the second arc section, the bottom end surface 308 of the base part abuts against the limit stop part 359 right, and the motion stability and reliability of the telescopic rod can be improved, for example, the telescopic rod cannot move due to the clamping stagnation phenomenon of the telescopic rod and the movable pin in the relative motion process;

when the moveable pin 305 is in the side groove 320, the valve element 20 is in the open position;

in the intermediate position 332, in which the movable pin 305 rests on the lower groove side of the upper guide section, the valve element 20 is in the closed position.

The compression spring 303 has a tendency to move the telescoping rod 302 from the retracted maximum position to the extended maximum position at all times.

The working principle of the telescopic mechanism of the invention is as follows:

as shown in fig. 16a, when the movable pin 305 is in the side groove 320, an external force (not shown) is applied, and the external force can act on the telescopic rod 302 to drive the telescopic rod 302 to retract into the housing accommodating cavity 354 against the force of the compression spring 303, the movable pin 305 enters the lower guide section 319 from the side groove entrance/exit 342, then abuts against the third inclined section 334 on the upper groove side of the lower guide section (as shown in fig. 16 b), and is guided to the head end 318 of the upper section by the third inclined section 334 on the upper groove side of the lower guide section (as shown in fig. 16 c), then moves from the head end 318 of the upper section along the upper section 313 to the tail end 314 of the upper section and enters the upper guide section 316, then abuts against the first inclined section 321 on the upper groove side of the upper guide section, and is guided to the first inclined section 360 and abuts against the first circular arc section 360 by the first inclined section 321 on the upper groove side of the upper guide section (as shown in fig. 16 d), at this time, the bottom end surface 308 of the base portion of the retractable rod abuts against the limit stop portion 359, and the retractable rod 302 is at the maximum retraction position. After the external force is removed, the compression spring 303 drives the telescopic rod 302 to move in an extending manner, so that the movable pin 305 abuts against the lower groove side 362 of the upper guide section (as shown in fig. 16e, especially the movable pin 305 abuts against the lower groove side of the upper guide section between the right end 331 of the lower groove side of the upper guide section and the middle position 332 of the lower groove side of the upper guide section), is guided by the lower groove side 362 of the upper guide section to the middle position 332 of the lower groove side of the upper guide section, and finally stops at the middle position 332 of the lower groove side of the upper guide section (as shown in fig. 16 f), and at this time, the plug body 215 of the sealing plug is inserted into the sealing ring through hole 503 of the sealing ring, and the valve core 20 is in the closed position.

As shown in fig. 16f, when the movable pin stops at the middle position 332 on the lower groove side of the upper guiding section, an external force (not shown in the figure) is applied, and the external force can act on the telescopic rod 302 to drive the telescopic rod 302 to move to retract into the housing accommodating cavity 354 again against the force of the compression spring 303, the movable pin 305 first abuts against the second inclined section 323 on the upper groove side of the upper guiding section (as shown in fig. 16 g), and the movable pin 305 is guided to the second arc section 361 by the second inclined section 323 on the upper groove side of the upper guiding section and abuts against the second arc section 361 (as shown in fig. 16 h), at this time, the bottom end surface 308 of the base portion of the telescopic rod abuts against the stop portion 359, the telescopic rod is at the maximum retraction position, and the movable pin 305 enters the head end 315 of the lower section. After the external force is removed, the compression spring 305 drives the telescopic rod 302 to extend under the action of the compression spring 305, the movable pin 305 moves from the head end 315 of the descending section to the tail end 317 of the descending section along the descending section 312 and enters the lower guide section 319 (as shown in fig. 16 i), and abuts against the outer arc section 337 of the lower groove side of the lower guide section, and is guided by the outer arc section 337 of the lower groove side of the lower guide section to the side groove inlet/outlet 342 (as shown in fig. 16 j), and falls into the side groove 320 (as shown in fig. 16a or fig. 16K) from the side groove inlet/outlet 342, and as shown in fig. 16K, when the movable pin 305 abuts against the groove bottom 341 of the side groove, the telescopic rod 302 is at the maximum extending position.

According to the technical scheme, the structure of the telescopic mechanism can be simplified through the track groove which is reasonably designed, the production and the manufacture are convenient, the telescopic motion of the telescopic rod is convenient to realize, and the telescopic motion has higher stability and reliability;

this technical scheme can be convenient for the assembly of removable pin and stop collar and telescopic link through setting up the stop collar, and the removable pin of being convenient for stretches into the cooperation of track inslot, can carry out spacing activity to the removable pin through set up the stop collar spout on the stop collar.

When the valve core 20 is in the open position, the outer end 356 of the rod portion of the telescopic rod abuts against the lower end of the large diameter section 210 of the lower core shaft, the valve core protrusion 202 abuts against the valve core locking piece 105, and the movable pin 305 is located in the side groove 320 but not abutting against the groove bottom 341 of the side groove (as shown in fig. 16 a); this technical scheme can be so that the case is in the thrust effect that receives the outer end of the push-rod portion of telescopic link all the time, avoids the case not hard up to appear, improves the complex precision.

The cross section of the base 306 of the telescopic rod is square, and the limiting sleeve 304 is a square sleeve, so that the limiting sleeve can limit the movement of the telescopic rod;

two opposite side surfaces 310 of the base part of the telescopic rod are respectively provided with a track groove 311, the side walls 352 of the limiting sleeve 304 corresponding to the side surfaces 310 of the base part of the telescopic rod provided with the track grooves are respectively provided with a limiting sleeve sliding groove 353, and each limiting sleeve sliding groove 353 is respectively provided with a movable pin 305; the track groove 311, the limiting sleeve sliding groove 353 and the movable pin 305 form a group of telescopic movable operation units, and the technical scheme can improve the reliability and stability of movement by respectively forming a group of telescopic movable operation units on two opposite sides of the base part of the telescopic rod;

the shell 301 is formed by splicing two half shells with the same structure, so that the telescopic mechanism can be conveniently disassembled and assembled;

the housing 301 is provided with a ring-shaped protrusion 364 surrounding the housing opening 355;

the telescopic mechanism further comprises a rubber telescopic sealing sleeve 365 sleeved outside the push rod part of the telescopic rod, one end of the rubber telescopic sealing sleeve 365 is fixedly arranged on the convex part 364, and the other end of the rubber telescopic sealing sleeve 365 is fixedly arranged on the outer end 356 of the push rod part of the telescopic rod. This technical scheme can play water-proof effects through setting up the flexible seal cover of rubber, prevents that water from getting into shell holding intracavity and causing the influence to stop collar, removable pin, telescopic link, compression spring.

The valve body comprises a first cylinder 108, a second cylinder 109, a third cylinder 110, a fourth cylinder 111 and a fifth cylinder 112 which are sequentially communicated to form the water flow channel 103, wherein the cylinders are hollow and open at two ends;

the lower end 114 of the first cylinder and the upper end 115 of the second cylinder, the lower end 116 of the second cylinder and the upper end 117 of the third cylinder, the lower end 118 of the third cylinder and the upper end 119 of the fourth cylinder, and the lower end 120 of the fourth cylinder and the upper end 121 of the fifth cylinder are respectively connected in a detachable manner;

the upper end opening of the first cylinder is a water inlet 101, and the lower end opening of the fifth cylinder is a water outlet 102;

the upper end 113 of the first cylinder can be placed in a water containing cavity (not shown) of a bathroom device such as a washbasin, a bathtub and the like, and the lower end 122 of the fifth cylinder can be used for connecting a drain pipe (not shown);

the screen support flange 104 is disposed within the first cylinder 108, and in particular, the screen support flange 104 is disposed on an inner sidewall of the first cylinder 108;

an annular sealing ring fixing flange 123 is arranged in the second cylinder 109, and particularly, the sealing ring fixing flange 123 is arranged on the inner side wall of the second cylinder 109, the sealing ring is fixedly mounted (the fixing means in this embodiment is fixed mounting) on the sealing ring fixing flange, a stepped through hole 124 is enclosed by the sealing ring fixing flange 123, the sealing ring flange 502 is supported on a through hole step surface 125 of the stepped through hole 124, an annular step surface groove 126 is arranged on the through hole step surface 125, an annular sealing ring protrusion 504 is arranged on the sealing ring flange 503, and the sealing ring protrusion 504 is sunk into the step surface groove 126;

the valve core locking piece 105 is arranged in the third cylinder 110;

an upper alignment positioning stop 134 is arranged on one side of the valve core locking plate 105 facing the upper end opening 130 of the third cylinder, when the valve core 20 rotates anticlockwise and the valve core convex block 202 abuts against the upper alignment positioning stop 134, the valve core convex block 202 is aligned with the locking plate notch 106, and at the moment, the valve core convex block 202 is allowed to pass through the valve core locking plate 105 from the upper end opening 130 of the third cylinder to the lower end opening 131 of the third cylinder;

a lower alignment positioning stop 135 is arranged on one side of the valve core locking piece 105 facing the lower end opening 131 of the third cylinder, when the valve core 20 rotates anticlockwise to enable the valve core convex block 202 to be abutted against the lower alignment positioning stop 135, the valve core convex block 202 is aligned with the locking piece notch 106, and at the moment, the valve core convex block 202 is allowed to pass through the valve core locking piece 105 from the lower end opening 131 of the third cylinder to the upper end opening 130 of the third cylinder;

a dislocation positioning stop 136 is further arranged on one side of the valve core locking piece 105 facing the lower end opening 131 of the third cylinder, when the valve core 20 rotates clockwise to enable the valve core convex block 202 to abut against the dislocation positioning stop 136, the valve core convex block 202 is dislocated with the locking piece notch 106, at the moment, the valve core convex block 202 is stopped by the valve core locking piece 105 to prohibit the valve core convex block 202 from passing through the valve core locking piece 105 from the lower end opening 131 of the third cylinder to the direction of the upper end opening 130 of the third cylinder;

fig. 17 and 18 show the schematic view of the valve core protrusion 202 abutting against the misalignment stop 136, and at this time, after the valve core 20 (i.e. the gland 201) is rotated by 90 ° counterclockwise, the valve core protrusion 202 abuts against the lower alignment stop 135 (as shown in fig. 19 and 20);

fig. 19 and 20 show the schematic view of the valve core protrusion 202 abutting against the lower alignment positioning stop 135, and at this time, after the valve core 20 (i.e. the gland 201) is rotated by 90 ° clockwise, the valve core protrusion 202 abuts against the misalignment positioning stop 136 (as shown in fig. 17 and 10);

the working principle of the clutch structure of the embodiment is as follows:

the process of installing the valve core: when the valve core is manually inserted into the valve body from the water inlet and the valve core convex block 202 abuts against one side of the valve core locking plate 105 facing the upper end opening 130 of the third cylinder, the valve core 20 (i.e. the gland 201) is rotated counterclockwise until the valve core convex block 202 abuts against the upper alignment positioning stop 134, at this time, the valve core convex block 202 aligns with the locking plate notch 106, the valve core 20 is pushed to continue to be inserted into the valve body 10, the valve core convex block 202 penetrates through the valve core locking plate 105 from the lower end opening 131 of the third cylinder to the upper end opening 130 of the third cylinder, the lower end of the large diameter section 210 of the lower core shaft of the valve core penetrates through the valve core through hole 107 and abuts against the outer end 356 of the push rod part of the telescopic rod, after the lower end of the large diameter section 210 of the lower core shaft of the valve core abuts against the outer end 356 of the push rod part of the telescopic rod, the valve core 20 is pushed to continue to be, the valve core convex block 202 abuts against the dislocation positioning stop block 136, at the moment, the hand is released, the valve core 20 is acted by the telescopic rod 302, the telescopic rod 302 pushes the valve core 20 to enable the valve core convex block 202 to abut against one side of the valve core locking plate 105, which faces to the lower end opening 131 of the third cylinder body, and therefore the installation of the valve core is completed;

the process of drawing the valve core: after the gland 201 is manually twisted to enable the valve core to rotate 90 degrees along the anticlockwise direction, the valve core lug 202 is abutted against the lower alignment positioning stop block 135, and then the valve core 20 is manually lifted until the valve core 20 is pulled out of the valve body 10.

A guide cylinder 137 extending from the valve core locking plate 105 to the lower end opening 131 of the third cylinder toward the lower end opening 131 of the third cylinder is also arranged in the third cylinder 110; the guide cylinder 137 is hollow and has two open ends, however, the upper end opening of the guide cylinder 137 is blocked by the valve core locking plate 105, the valve core through hole 107 is communicated with the guide cylinder 137, and the lower end of the large diameter section 210 of the lower core shaft of the valve core passes through the valve core through hole 107 and then is inserted into the guide cylinder 137;

the lower alignment positioning block 135 and the dislocation positioning block 136 are both arranged on the inner side wall of the guide cylinder 137, and the lower alignment positioning block 135 and the dislocation positioning block 136 both extend from the valve core locking plate 105 to the lower end opening 131 of the third cylinder from one side facing the lower end opening 131 of the third cylinder, so that the valve core is always limited by the lower alignment positioning block and the dislocation positioning block in the telescopic motion process of switching between the opening position and the closing position, and even if the valve core rotates in the telescopic motion process, the valve core cannot be separated from the limited rotatable range between the lower alignment positioning block and the dislocation positioning block, and the phenomenon that the valve core cannot be pulled out of the valve body is avoided;

an upper ring sleeve 138 and an upper limiting baffle 139 are arranged in the fourth cylinder 111, two ends of the upper ring sleeve 138 are open, the upper limiting baffle 139 is arranged at the upper end opening of the upper ring sleeve 138, and a telescopic avoidance hole 140 is arranged on the upper limiting baffle 139;

the upper end 366 of the shell of the telescopic mechanism is inserted into the upper ring sleeve 138 from the lower end opening 141 of the upper ring sleeve and abuts against the upper limit baffle 139, and the outer end 356 of the push rod part of the telescopic rod of the telescopic mechanism penetrates through the telescopic avoidance hole 140 and abuts against the lower end of the large-diameter section 210 of the lower mandrel;

a lower ring sleeve 142 and a lower limiting baffle 143 are arranged in the fifth cylinder body 112, two ends of the lower ring sleeve 142 are open, and the lower limiting baffle 143 is arranged at the lower end opening of the lower ring sleeve 142;

the lower end 367 of the housing of the telescopic mechanism is inserted into the lower ring 142 from the upper end opening 144 of the lower ring and abuts against the lower limit baffle 143.

This technical scheme is through dividing into 5 barrels with the valve body (first barrel, second barrel, third barrel, fourth barrel and fifth barrel promptly), can be convenient for the manufacturing of each barrel, the dismouting of telescopic machanism of being convenient for.

According to the technical scheme, the upper ring sleeve and the lower ring sleeve are arranged, so that the telescopic mechanism can be conveniently positioned and installed.

The valve body further comprises a first locking ring 145, a second locking ring 146, a third locking ring 147 and a fourth locking ring 148, which are provided with internal threads;

the lower end 114 of the first cylinder, the upper end 115 of the second cylinder, the lower end 116 of the second cylinder, the upper end 117 of the third cylinder, the lower end 118 of the third cylinder, the upper end 119 of the fourth cylinder, the lower end 120 of the fourth cylinder and the upper end 121 of the fifth cylinder are all provided with external threads;

the lower end 114 of the first cylinder and the upper end 115 of the second cylinder are respectively in threaded connection with a first locking ring 145, the lower end 116 of the second cylinder and the upper end 117 of the third cylinder are respectively in threaded connection with a second locking ring 146, the lower end 118 of the third cylinder and the upper end 119 of the fourth cylinder are respectively in threaded connection with a third locking ring 147, and the lower end 120 of the fourth cylinder and the upper end 121 of the fifth cylinder are respectively in threaded connection with a fourth locking ring 148;

third cylinder connecting ribs 149 distributed around the valve core locking plate 105 at intervals in the circumferential direction are arranged between the inner side wall of the third cylinder 110 and the valve core locking plate 105, and a third cylinder water through hole 150 is formed between every two adjacent third cylinder connecting ribs 149, so that the technical scheme is reasonable in design and suitable for forming the water flow channel; fourth cylinder connecting ribs 151 distributed at intervals circumferentially around the upper ring 138 are arranged between the inner side wall of the fourth cylinder 111 and the upper ring 138, and a fourth cylinder water through hole 152 is formed between every two adjacent fourth cylinder connecting ribs 151, so that the technical scheme is reasonable in design and suitable for forming the water flow channel; fifth cylinder connecting ribs 153 distributed around the lower ring 142 at intervals in the circumferential direction are arranged between the inner side wall of the fifth cylinder 112 and the lower ring 142, and a fifth cylinder water through hole 154 is formed between every two adjacent fifth cylinder connecting ribs 153.

In this embodiment, the filter screen, the sealing ring, the third cylinder water passing hole, the fourth cylinder water passing hole and the fifth cylinder water passing hole are all located on the water flow channel. The water with the solid matters (such as particles, human hair and the like) is filtered by the filter screen when passing through the first cylinder.

The water flow channel sequentially passes through the filter screen 40, the lower end opening 127 of the first cylinder, the upper end opening 128 of the second cylinder, the sealing ring perforation 503, the lower end opening 129 of the second cylinder, the upper end opening 130 of the third cylinder, the third cylinder water passing hole 150, the lower end opening 131 of the third cylinder, the upper end opening 132 of the fourth cylinder, the fourth cylinder water passing hole 152, the lower end opening 133 of the fourth cylinder, the upper end opening 155 of the fifth cylinder, the fifth cylinder water passing hole 154 and the lower end opening (i.e. the water outlet 102) of the fifth cylinder from the upper end opening (i.e. the water inlet 101) of the first cylinder.

Claims

1. The utility model provides a filter screen, is applied to the drain valve, and this drain valve includes the valve body, and this valve body is equipped with water inlet, delivery port and extends to the rivers passageway of delivery port from the water inlet, is equipped with in the valve body to be used for intercepting the solid and the filter screen that allows water to pass through on the rivers passageway, its characterized in that:

the filter screen comprises a filter screen outer ring, a filter screen inner ring enclosed in the filter screen outer ring and a screen body with meshes arranged between the filter screen outer ring and the filter screen inner ring;

the valve body is internally provided with a filter screen supporting flange, the filter screen is placed into the valve body from the water inlet of the valve body, and when the outer ring of the filter screen is abutted against the filter screen supporting flange, the filter screen is supported on the filter screen supporting flange.

2. The screen of claim 1, wherein:

the drain valve also comprises a valve core and a telescopic mechanism;

the telescopic mechanism is arranged in the valve body;

the valve core comprises a core shaft and a gland which can be pressed by a user, one end of the core shaft is connected with the gland, and the other end of the core shaft is inserted into the valve body from the water inlet;

when the gland is pressed, the telescopic mechanism drives the valve core to switch between an opening position and a closing position;

an opening and closing mechanism which can selectively block or unblock the water flow channel is arranged between the valve core and the valve body;

when the valve core is in the opening position, the opening and closing mechanism enables the water flow channel to be unobstructed;

when the valve core is at the closed position, the opening and closing mechanism enables the water flow passage to be blocked.

3. The screen of claim 2, wherein:

the inner ring of the filter screen is enclosed into an inner ring perforation;

a clutch structure which can prevent or allow the valve core to be pulled out of the valve body is arranged between the valve core and the valve body, and the clutch structure is switched between a combined state and a disassembled state;

when the clutch structure is in a combined state, the valve core is prevented from being pulled out of the valve body;

when the clutch structure is in a split state, the valve core is allowed to be pulled out of the valve body;

the core shaft of the valve core can slidably penetrate through the inner ring through hole of the filter screen, the valve core is provided with a lifting part positioned below the filter screen, and the outer diameter of the lifting part is larger than the diameter of the inner ring through hole, so that when the valve core is pulled out of the valve body, the lifting part brings the filter screen out of the valve body.

4. The screen of claim 3, wherein:

the clutch structure comprises a valve core locking plate which is arranged in the valve body and is annular and a valve core lug which is arranged on the core shaft;

the valve core locking plate is provided with a locking plate notch, and the valve core locking plate is enclosed into a valve core through hole for the core shaft to pass through;

when the valve core convex block is aligned with the locking plate notch, the valve core convex block is allowed to pass through the valve core locking plate, and at the moment, the clutch structure is in a split state;

when the valve core convex block and the locking plate notch are dislocated, the valve core convex block is blocked by the valve core locking plate and the valve core convex block is forbidden to pass through the valve core locking plate, and at the moment, the clutch structure is in a combined state;

when the core shaft rotates, the valve core lug and the locking plate notch are aligned or dislocated selectively, the core shaft and the gland are connected relatively and fixedly, and the gland is twisted to drive the core shaft to rotate.

5. The screen of claim 4, wherein:

the opening and closing mechanism comprises a sealing plug arranged on a core shaft of the valve core;

the core shaft of the valve core comprises an upper core shaft and a lower core shaft;

the upper end of the upper mandrel is detachably connected with the gland, and the lower end of the upper mandrel is provided with an upper mandrel jack;

the upper mandrel can slidably penetrate through the inner ring perforation of the filter screen so that the filter screen is sleeved outside the upper mandrel, and the diameter of the inner ring perforation is larger than or equal to that of the upper mandrel;

the lower mandrel is in a stepped shaft shape and comprises a small-diameter section and a large-diameter section, the lower end of the small-diameter section is connected with the upper end of the large-diameter section, and a mandrel step surface is formed at the connection part of the lower end of the small-diameter section and the upper end of the large-diameter section;

the sealing plug is provided with a sealing plug central hole, and the upper end of the small-diameter section of the lower mandrel penetrates through the sealing plug central hole and is inserted into the upper mandrel jack in a detachable mode, so that the sealing plug is clamped between the lower end of the upper mandrel and the step surface of the mandrel;

the diameter of the central hole of the sealing plug is larger than or equal to that of the small-diameter section of the lower mandrel, and the diameter of the central hole of the sealing plug is smaller than that of the large-diameter section of the lower mandrel;

the lower end of the large-diameter section of the lower mandrel is arranged on the valve core convex block, and the valve core convex block extends along the radial direction of the large-diameter section of the lower mandrel.

6. The screen of claim 5, wherein:

the opening and closing mechanism also comprises a sealing ring arranged in the valve body;

the sealing plug comprises a plugging body, wherein the plugging body is a truncated cone body, the diameter of the plugging body is gradually increased from the bottom surface of the plugging body to the top surface of the plugging body, the top surface of the plugging body is provided with an annular sealing plug flange extending along the radial direction of the plugging body, the sealing plug flange is a lifting part, and a central hole of the sealing plug extends from the bottom surface of the plugging body to the top surface of the plugging body so as to penetrate through the plugging body;

the sealing ring comprises a ring-shaped sealing ring main body and a sealing ring flange extending along the radial direction of the sealing ring main body, the sealing ring main body is encircled into a sealing ring through hole into which the plugging body can be inserted, and the diameter of the sealing ring through hole is gradually reduced along the direction in which the plugging body is inserted into the sealing ring through hole;

when the plugging body is inserted into the sealing ring perforation, the sealing ring perforation is plugged by the plugging body, and the valve core is in a closed position;

when the plug-in body is pulled out of the sealing ring perforation, the sealing ring perforation is opened, and the valve core is in an opening position.

7. The screen of claim 6, wherein:

the telescopic mechanism comprises a shell, a telescopic rod, a compression spring, a limiting sleeve and a movable pin;

the telescopic rod comprises a base part and a push rod part upwards extending from the top end of the base part, wherein a base part accommodating hole extending from the bottom end of the base part to the inside of the base part is formed in the base part;

the side surface of the base part is provided with a track groove, and the track groove comprises a descending section, an ascending section which is parallel to the descending section and has a certain distance, an upper guide section which is connected between the tail end of the ascending section and the head end of the descending section, and a lower guide section which is connected between the tail end of the descending section and the head end of the ascending section; one side of the lower guide section is provided with a side groove communicated with the lower guide section; wherein,

the upper groove side of the upper guide section comprises a first inclined section, a transition section and a second inclined section, the lower end of the first inclined section is connected with the tail end of the upper traveling section, the high end of the first inclined section is connected with the upper end of the transition section, the lower end of the transition section is connected with the low end of the second inclined section, and the high end of the second inclined section is connected with the head end of the lower traveling section;

the lower groove side of the upper guide section opposite to the upper groove side of the upper guide section is in a fox-surface shape with high left and right ends and low middle position for the movable pin to stop; the right end of the lower groove side of the upper guide section is connected with the tail end of the upper traveling section, and the left end of the lower groove side of the upper guide section is connected with the head end of the lower traveling section;

the upper groove side of the lower guide section comprises an inner arc section and a third inclined section, one end of the inner arc section is connected with the tail end of the descending section, the other end of the inner arc section is connected with the lower end of the third inclined section, and the high end of the third inclined section is connected with the head end of the ascending section;

the lower groove side of the lower guide section opposite to the upper groove side of the lower guide section comprises an outer arc section and a connecting section, and the side groove comprises a left groove side of the side groove, a right groove side of the side groove opposite to the left groove side of the side groove, a groove bottom of the side groove and a side groove inlet and outlet opposite to the groove bottom of the side groove;

one end of the outer arc section is connected with the tail end of the descending section, the other end of the outer arc section is connected with the upper end of the left groove side of the side groove, the lower end of the left groove side of the side groove is connected with the left end of the groove bottom of the side groove, the right end of the groove bottom of the side groove is connected with the lower end of the right groove side of the side groove, the upper end of the right groove side of the side groove is connected with one end of the connecting section, and the other end of the connecting section is connected with the head end of the ascending section;

the side groove inlet and outlet are positioned at the joint of the lower guide section and the side groove;

the limiting sleeve is hollow and has two openings at two ends, the limiting sleeve is slidably sleeved outside the base part of the telescopic rod, a limiting sleeve sliding groove which is strip-shaped and penetrates through the side wall of the limiting sleeve is arranged on the side wall of the limiting sleeve, and the length direction of the limiting sleeve sliding groove is vertical to the motion direction of the telescopic rod;

one end of the movable pin penetrates through the limiting sleeve sliding groove and extends into the track groove, the other end of the movable pin is reserved in the limiting sleeve sliding groove, and the movable pin moves along the length direction of the limiting sleeve sliding groove under the guidance of the limiting sleeve sliding groove;

a shell accommodating cavity is formed in the shell, a shell opening communicated with the shell accommodating cavity is formed in the top of the shell, the limiting sleeve is installed in the shell accommodating cavity, the outer end, far away from the base, of the push rod part of the telescopic rod extends out of the shell from the shell opening, and the outer end of the push rod part of the telescopic rod abuts against the lower end of the large-diameter section of the lower mandrel;

the compression spring is arranged in the base accommodating hole, one end of the compression spring is propped against the bottom of the base accommodating hole, and the other end of the compression spring is propped against the shell;

the shell containing cavity is provided with a limit stop part;

when the bottom end surface of the base part of the telescopic rod is abutted against the limit stop part, the telescopic rod is in the maximum retraction position;

when the movable pin is abutted against the bottom of the side groove, the telescopic rod is in the maximum extending position;

the telescopic rod moves between a maximum extending position and a maximum retracting position;

the high end of the first inclined section is connected with the upper end of the transition section through a first arc section, and the high end of the second inclined section is connected with the head end of the descending section through a second arc section;

when the movable pin abuts against the first arc section or the second arc section, the bottom end surface of the base part of the telescopic rod abuts against the limiting stop part;

when the movable pin is positioned in the side groove, the valve core is positioned at an opening position;

when the movable pin stops at the middle position of the lower groove side of the upper guide section, the valve core is in the closed position.

8. The screen of claim 7, wherein:

when the valve core is in the opening position, the valve core convex block is abutted against the valve core locking plate, and the movable pin is positioned in the side groove but is not abutted against the groove bottom of the side groove;

the cross section of the base part of the telescopic rod is square, the limiting sleeve is a square sleeve, two opposite side surfaces of the base part of the telescopic rod are respectively provided with a track groove, the limiting sleeve and the side surface of the base part of the telescopic rod provided with the track groove are respectively provided with a limiting sleeve sliding groove, and each limiting sleeve sliding groove is respectively provided with a movable pin;

the outer shell is formed by splicing two half shells, wherein the radiuses of the circle where the first arc section is located, the circle where the second arc section is located and the movable pin are equal;

the shell is provided with a ring-shaped convex part surrounding the shell opening;

the telescopic mechanism further comprises a rubber telescopic sealing sleeve sleeved outside the push rod part of the telescopic rod, one end of the rubber telescopic sealing sleeve is fixedly arranged on the convex part, and the other end of the rubber telescopic sealing sleeve is fixedly arranged on the outer end of the push rod part of the telescopic rod.

9. The screen of claim 8, wherein:

the valve body comprises a first cylinder, a second cylinder, a third cylinder, a fourth cylinder and a fifth cylinder which are sequentially communicated to form the water flow channel, and the cylinders are hollow and open at two ends;

the lower end of the first cylinder and the upper end of the second cylinder, the lower end of the second cylinder and the upper end of the third cylinder, the lower end of the third cylinder and the upper end of the fourth cylinder, and the lower end of the fourth cylinder and the upper end of the fifth cylinder are respectively connected in a detachable mode;

the upper end opening of the first cylinder is a water inlet, and the lower end opening of the fifth cylinder is a water outlet;

the filter screen supporting flange is arranged in the first cylinder;

an annular sealing ring fixing flange is arranged in the second cylinder body, the sealing ring fixing flange is encircled into a stepped through hole, the sealing ring flange is supported on a step surface of the stepped through hole, an annular step surface groove is formed in the step surface of the through hole, an annular sealing ring protrusion is arranged on the sealing ring flange, and the sealing ring protrusion sinks into the step surface groove;

the valve core locking plate is arranged in the third cylinder;

an upper alignment positioning stop block is arranged on one side of the valve core locking plate, which faces the opening at the upper end of the third barrel, and when the valve core rotates anticlockwise and a valve core lug is abutted against the upper alignment positioning stop block, the valve core lug is aligned with a locking plate notch;

a lower alignment positioning stop block is arranged on one side of the valve core locking plate, which faces the lower end opening of the third barrel, and when the valve core rotates anticlockwise and the valve core convex block is abutted against the lower alignment positioning stop block, the valve core convex block is aligned with the locking plate notch;

a dislocation positioning stop block is further arranged on one side of the valve core locking plate, which faces the lower end opening of the third barrel, and when the valve core rotates clockwise and the valve core convex block abuts against the dislocation positioning stop block, the valve core convex block is dislocated with the locking plate notch;

a guide cylinder body extending from one side of the valve core locking plate, which faces the lower end opening of the third cylinder body, to the lower end opening of the third cylinder body is also arranged in the third cylinder body;

the lower alignment positioning stop block and the dislocation positioning stop block are both arranged on the inner side wall of the guide cylinder body and extend towards the lower end opening of the third cylinder body from one side of the valve core locking plate, which faces the lower end opening of the third cylinder body;

an upper ring sleeve and an upper limiting baffle are arranged in the fourth barrel body, two ends of the upper ring sleeve are open, the upper limiting baffle is arranged at the upper end opening of the upper ring sleeve, and a telescopic avoidance hole is formed in the upper limiting baffle;

the upper end of the shell of the telescopic mechanism is inserted into the upper ring sleeve from the lower end opening of the upper ring sleeve and abuts against the upper limiting baffle, and the outer end of the push rod part of the telescopic rod of the telescopic mechanism penetrates through the telescopic avoidance hole and abuts against the lower end of the large-diameter section of the lower mandrel;

a lower ring sleeve and a lower limiting baffle are arranged in the fifth cylinder body, two ends of the lower ring sleeve are open, and the lower limiting baffle is arranged at the lower end opening of the lower ring sleeve;

the lower end of the shell of the telescopic mechanism is inserted into the lower ring sleeve from the upper end opening of the lower ring sleeve and abuts against the lower limiting baffle.

10. The screen of claim 9, wherein:

the valve body also comprises a first locking ring, a second locking ring, a third locking ring and a fourth locking ring, wherein the locking rings are provided with internal threads;

external threads are arranged at the lower end of the first barrel, the upper end of the second barrel, the lower end of the second barrel, the upper end of the third barrel, the lower end of the third barrel, the upper end of the fourth barrel, the lower end of the fourth barrel and the upper end of the fifth barrel;

the lower end of the first barrel and the upper end of the second barrel are respectively in threaded connection with the first locking ring, the lower end of the second barrel and the upper end of the third barrel are respectively in threaded connection with the second locking ring, the lower end of the third barrel and the upper end of the fourth barrel are respectively in threaded connection with the third locking ring, and the lower end of the fourth barrel and the upper end of the fifth barrel are respectively in threaded connection with the fourth locking ring;

third cylinder connecting ribs which are distributed at intervals around the circumferential direction of the valve core locking plate are arranged between the inner side wall of the third cylinder and the valve core locking plate, and a third cylinder water passing hole is formed between every two adjacent third cylinder connecting ribs;

fourth cylinder connecting ribs distributed at intervals around the circumference of the upper ring are arranged between the inner side wall of the fourth cylinder and the upper ring, and a fourth cylinder water through hole is formed between every two adjacent fourth cylinder connecting ribs;

fifth cylinder connecting ribs which are distributed at intervals around the circumferential direction of the lower ring are arranged between the inner side wall of the fifth cylinder and the lower ring, and a fifth cylinder water passing hole is formed between every two adjacent fifth cylinder connecting ribs.