Pilot-operated type pressure reducing valve with self-dredging and anti-blocking functions

Abstract

The invention discloses a pilot-operated type pressure reducing valve with self-dredging and anti-blocking functions, and relates to the technical field of pressure reducing valves. The anti-blocking valve comprises a valve body, an opening and closing piece is arranged in the middle of the interior of the valve body, an anti-blocking device is arranged on one side of a water inlet in the valve body and comprises a U-shaped frame, the U-shaped frame is fixed in the valve body, an impeller is rotationally installed on the left side of the U-shaped frame, and a frame plate ring is fixed to the left side of the impeller; a blade rod is fixed to the middle of the left side of the frame plate ring, and a spiral cutter rod is fixed to the side, away from the blade rod, of the left side of the frame plate ring. Through the arrangement of the impeller, fluid drives the impeller to rotate, the impeller drives the frame plate ring to rotate, the frame plate ring rotates the blade rod and the spiral cutter rod, the spiral cutter rod rotates to scrape impurities attached to the inner wall of the valve body, and therefore the problem that the impurities are attached to the valve body, and consequently the valve body is blocked is solved.

Description

Technical Field

[0001] The invention relates to the technical field of pressure reducing valves, in particular to a pilot-operated pressure reducing valve with self-dredging and anti-blocking functions. Background Art

[0002] The pilot-operated pressure reducing valve adjusts the flow of the medium by controlling the opening of the opening and closing parts in the valve body, reduces the pressure of the medium, and adjusts the opening of the opening and closing parts by means of the pressure behind the valve, so that the pressure behind the valve is kept within a certain range. When the inlet pressure keeps changing, the outlet pressure is kept within the set range to protect the subsequent life and production equipment. The valve should generally be installed horizontally on the pipeline.

[0003] The existing pilot-operated pressure reducing valve is prone to blockage because the internal structure of the pressure reducing valve is relatively complex. If there are impurities in the fluid, it may damage the internal structure of the pressure reducing valve, thereby destroying the function of the pressure reducing valve. Therefore, we propose a pilot-operated pressure reducing valve with self-dredging and anti-blocking functions. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a pilot-operated pressure reducing valve with self-dredging and anti-blocking functions, which solves the problems raised in the above-mentioned background technology.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a pilot-operated pressure reducing valve with self-draining and anti-blocking functions, comprising a valve body, an opening and closing member is arranged in the middle of the interior of the valve body, an anti-blocking device is arranged on one side of the internal water inlet of the valve body, the anti-blocking device comprises a U-shaped frame, the U-shaped frame is fixed to the interior of the valve body, an impeller is rotatably installed on the left side of the U-shaped frame, a frame plate ring is fixed on the left side of the impeller, a blade rod is fixed in the middle of the left side of the frame plate ring, and a spiral knife rod is fixed on the left side of the frame plate ring away from the blade rod.

[0006] Preferably, the spiral blade rod is in contact with the inner wall of the valve body, and there are a plurality of blade rods, which are evenly arranged in the middle of the left side of the frame plate ring.

[0007] Preferably, elastic convex ball rods are fixed to the top and bottom of the inner wall of the U-shaped frame, a convex ball is fixed to the side of the elastic convex ball rod away from the U-shaped frame, a convex ball block is fixed to the inner side of the frame plate ring, and the convex ball block of the frame plate ring contacts the convex ball of the elastic convex ball rod.

[0008] Preferably, a filtering device is provided on the side of the anti-blocking device close to the opening and closing member, and the filtering device includes a rotating rod, which passes through and is rotatably installed on the right side of the U-shaped frame, and the rotating rod is fixed to the right side of the impeller. A V-shaped plate is fixed to the right side of the rotating rod, and a cleaning brush is fixed to the right side of the V-shaped plate. The right side of the cleaning brush contacts the left side of the filter screen, and the filter screen is fixed on the inner wall of the valve body, and a collecting device is provided below the filter screen.

[0009] Preferably, the collecting device includes a collecting box, which is embedded in the bottom of the valve body, the interior of the collecting box is connected to the interior of the valve body, the inner wall of the collecting box close to the filter screen is hinged to the middle part of the swing rod, the left and right sides of the swing rod are fixed with arc-shaped resistance rods, the left and right sides of the inner wall of the collecting box are hinged with baffles, the bottom of the baffle is elastically connected to the inner wall of the collecting box by a spring sheet, and a fork-shaped flip plate is fixed to the side of the bottom of the swing rod away from the filter screen.

[0010] Preferably, an elastic bump rod is fixed to the left side of the V-shaped plate, a knocking rod is fixed to the side of the elastic bump rod close to the V-shaped plate, the knocking rod is in contact with the V-shaped plate on the side away from the elastic bump rod, a bump is fixed to the side of the elastic bump rod away from the V-shaped plate, a bump is fixed at the left edge of the filter net, and the bump of the elastic bump rod is in contact with the bump of the filter net.

[0011] Preferably, the top of the baffle is in contact with a side of the arc-shaped abutment rod away from the swing rod, and the swing rod is located on the movement track of the V-shaped plate.

[0012] Preferably, a cleaning device is provided below the opening and closing member, and the cleaning device includes a plug ring, the plug ring is fixed inside the valve body, a fixing ring is fixed to the bottom of the plug ring, a swivel is rotatably mounted on the inner side of the fixing ring, a blade is fixed to the inner side of the swivel, an elastic plate is fixed to the side of the bottom of the plug ring away from the fixing ring, an impact rod is fixed to the right side of the elastic plate, the bottom of the inner wall of the plug ring is fixedly connected to one end of the conduction rod, and the other end of the conduction rod is in contact with the top of the inner wall of the plug ring.

[0013] Preferably, a guide plate is fixed to the bottom of the plug ring away from the side close to the center of the plug ring, a steel ball is arranged above the guide plate, and the steel ball is elastically connected to the side of the conduction rod close to the center of the plug ring through an elastic rope.

[0014] Preferably, a side of the impact rod away from the elastic plate contacts the bottom of the plug ring, and the elastic plate is located on the movement trajectory of the blade.

[0015] The present invention provides a pilot-operated pressure reducing valve with self-dredging and anti-blocking functions. It has the following beneficial effects: (1) The present invention arranges the impeller so that the fluid drives the impeller to rotate, the impeller drives the frame plate ring to rotate, the frame plate ring respectively drives the blade rod and the spiral blade rod to rotate, the rotation of the spiral blade rod will scrape off the impurities attached to the inner wall of the valve body, thereby avoiding the problem of impurities adhering to the valve body and causing the valve body to be blocked, and the rotation of the blade rod will crush larger impurities, thereby avoiding the problem of large impurities easily clogging the pipeline.

[0016] (2) The present invention cooperates with the impeller and the rotating rod, so that the impeller drives the rotating rod to rotate, and the rotating rod drives the cleaning brush to clean the filter screen through the V-shaped plate, thereby avoiding the problem of clogging of the filter screen and affecting the fluid flow performance of the valve body; at the same time, the protrusion of the elastic protrusion rod cooperates with the protrusion of the filter screen, so that the protrusion of the filter screen contacts the elastic protrusion rod and moves away from the V-shaped plate, and the elastic protrusion rod drives the knocking rod to move. When the protrusion of the filter screen does not contact the elastic protrusion rod, under the action of the elastic force of the elastic protrusion rod, the elastic protrusion rod drives the knocking rod to knock the V-shaped plate, and the V-shaped plate vibrates and drives the cleaning brush to vibrate, and the cleaning brush shakes off the impurities attached to it, thereby improving the cleaning efficiency of the cleaning brush on the filter screen.

[0017] (3) The present invention cooperates with the V-shaped plate and the swing rod, so that the V-shaped plate pushes the swing rod to swing, and the swing rod drives the arc-shaped resistance rod to push the baffle plate, so that the impurities cleaned by the cleaning brush fall into the collection box, thereby achieving the purpose of collecting the impurities. At the same time, the setting of the baffle plate avoids the problem of impurities in the collection box rushing out; at the same time, the swing rod drives the fork-shaped flip plate to flip the impurities in the collection box, thereby avoiding the problem of impurities in the collection box accumulating.

[0018] (4) The present invention cooperates with the blade and the elastic plate so that the blade pushes the elastic plate to drive the impact rod to move away from the plug ring. When the blade does not push the elastic plate, the elastic force of the elastic plate causes the elastic plate to drive the impact rod to strike the plug ring. Under the conduction of the conduction rod, the conduction rod vibrates and drives the upper end of the plug ring to vibrate, thereby avoiding the problem of tiny impurities adhering to the plug ring, resulting in a loose connection between the opening and closing member and the plug ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the present invention as a whole; Figure 2 It is a partial cross-sectional schematic diagram of the present invention as a whole; Figure 3 is a schematic diagram of the anti-blocking device of the present invention; Figure 4 For the present invention Figure 3 A schematic diagram of the enlarged structure at A; Figure 5 It is a partial cross-sectional schematic diagram of the filtering device of the present invention; Figure 6 For the present invention Figure 5 A schematic diagram showing an enlarged structure at position B; Figure 7 is a bottom schematic view of the cleaning device of the present invention; Figure 8 It is a partial cross-sectional schematic diagram of the plug ring of the present invention.

[0020] In the figure: 1. valve body; 2. opening and closing member; 3. anti-blocking device; 31. U-shaped frame; 32. impeller; 33. frame plate ring; 34. blade rod; 35. spiral knife rod; 36. elastic convex ball rod; 4. filtering device; 41. rotating rod; 42. V-shaped plate; 421. elastic convex block rod; 422. knocking rod; 43. cleaning brush; 44. filter net; 45. collecting device; 451. collecting box; 452. swing rod; 453. arc-shaped resistance rod; 454. baffle; 456. fork-shaped flip plate; 5. cleaning device; 51. plug ring; 52. fixing ring; 53. rotating ring; 54. blade; 55. elastic plate; 56. impact rod; 57. conduction rod; 58. guide plate; 59. steel ball. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0022] See also Figure 1-8The present invention provides a technical solution: a pilot pressure reducing valve with self-dredging and anti-blocking functions, comprising a valve body 1, an opening and closing member 2 is arranged in the middle of the interior of the valve body 1, an anti-blocking device 3 is arranged on one side of the internal water inlet of the valve body 1, and the anti-blocking device 3 comprises a U-shaped frame 31, the U-shaped frame 31 is fixed inside the valve body 1, an impeller 32 is rotatably installed on the left side of the U-shaped frame 31, a frame plate ring 33 is fixed on the left side of the impeller 32, a blade rod 34 is fixed in the middle of the left side of the frame plate ring 33, and the blade rod 34 has a plurality of Several blade rods 34 are evenly arranged in the middle of the left side of the frame plate ring 33. A spiral blade rod 35 is fixed on the left side of the frame plate ring 33 away from the blade rod 34. The spiral blade rod 35 contacts the inner wall of the valve body 1. Through the setting of the impeller 32, the fluid drives the impeller 32 to rotate, and the impeller 32 drives the frame plate ring 33 to rotate. The frame plate ring 33 rotates the blade rod 34 and the spiral blade rod 35 respectively. The rotation of the spiral blade rod 35 will scrape off the impurities attached to the inner wall of the valve body 1, thereby preventing the impurities from adhering to the valve body. The blade rod 34 rotates to break up the larger impurities, thereby avoiding the problem that the larger impurities easily clog the pipeline. The top and bottom of the inner wall of the U-shaped frame 31 are fixed with elastic convex ball rods 36, and a convex ball is fixed on the side of the elastic convex ball rod 36 away from the U-shaped frame 31. A convex ball block is fixed on the inner side of the frame plate ring 33. The convex ball block of the frame plate ring 33 contacts the convex ball of the elastic convex ball rod 36. The convex ball block of the frame plate ring 33 cooperates with the convex ball of the elastic convex ball rod 36, so that The convex ball block of the frame plate ring 33 contacts the elastic convex ball rod 36 and moves away from the U-shaped frame 31. When the convex ball block of the frame plate ring 33 does not contact the elastic convex ball rod 36, under the elastic action of the elastic convex ball rod 36, the elastic convex ball rod 36 drives the convex ball thereon to knock the frame plate ring 33. The frame plate ring 33 vibrates and drives the blade rod 34 and the spiral knife rod 35 to vibrate. The blade rod 34 and the spiral knife rod 35 shake off impurities attached thereto, thereby improving the efficiency of the blade rod 34 and the spiral knife rod 35 in handling impurities.

[0023] A filter device 4 is provided on one side of the anti-blocking device 3 close to the opening and closing member 2. The filter device 4 includes a rotating rod 41, which penetrates and is rotatably installed on the right side of the U-shaped frame 31. The rotating rod 41 is fixed to the right side of the impeller 32. A V-shaped plate 42 is fixed to the right side of the rotating rod 41. A cleaning brush 43 is fixed to the right side of the V-shaped plate 42. The right side of the cleaning brush 43 contacts the left side of the filter screen 44. The impeller 32 cooperates with the rotating rod 41, so that the impeller 32 drives the rotating rod 41 to rotate, and the rotating rod 41 drives the cleaning brush 43 to clean the filter screen 44 through the V-shaped plate 42, thereby avoiding the problem of clogging of the filter screen 44 and affecting the fluid flow performance of the valve body 1. The filter screen 44 is fixed on the inner wall of the valve body 1. Through the setting of the filter screen 44, the filter screen 44 filters impurities in the fluid, thereby avoiding the problem of impurities causing damage to the internal structure of the valve body 1. A collecting device 45 is provided below the filter screen 44, and an elastic protrusion rod 4 is fixed to the left side of the V-shaped plate 42 21, a knocking rod 422 is fixed on the side of the elastic protrusion rod 421 close to the V-shaped plate 42, and the knocking rod 422 is in contact with the V-shaped plate 42 on the side away from the elastic protrusion rod 421. A protrusion is fixed on the side of the elastic protrusion rod 421 away from the V-shaped plate 42. A protrusion is fixed on the left edge of the filter screen 44. The protrusion of the elastic protrusion rod 421 contacts the protrusion of the filter screen 44. At the same time, the protrusion of the elastic protrusion rod 421 cooperates with the protrusion of the filter screen 44, so that the protrusion of the filter screen 44 contacts The elastic protrusion rod 421 moves away from the V-shaped plate 42, and the elastic protrusion rod 421 drives the knocking rod 422 to move. When the protrusion of the filter screen 44 does not interfere with the elastic protrusion rod 421, under the action of the elastic force of the elastic protrusion rod 421, the elastic protrusion rod 421 drives the knocking rod 422 to knock on the V-shaped plate 42. The V-shaped plate 42 vibrates and drives the cleaning brush 43 to vibrate. The cleaning brush 43 shakes off impurities attached to it, thereby improving the cleaning efficiency of the cleaning brush 43 on the filter screen 44.

[0024] The collecting device 45 includes a collecting box 451, which is embedded in the bottom of the valve body 1. The interior of the collecting box 451 is connected to the interior of the valve body 1. The inner wall of the collecting box 451 close to the filter screen 44 is hinged to the middle of the swing rod 452. The swing rod 452 is located on the movement track of the V-shaped plate 42. The left and right sides of the swing rod 452 are fixed with arc-shaped contact rods 453. The left and right sides of the inner wall of the collecting box 451 are hinged with baffles 454. The top of the baffle 454 contacts the side of the arc-shaped contact rod 453 away from the swing rod 452. The V-shaped plate 42 cooperates with the swing rod 452, so that the V-shaped plate 42 pushes the swing rod 452 to move. The swing rod 452 drives the arc-shaped resistance rod 453 to push the baffle 454, so that the impurities cleaned by the cleaning brush 43 fall into the collection box 451, thereby achieving the purpose of collecting the impurities. At the same time, the setting of the baffle 454 avoids the problem of impurities in the collection box 451 rushing out. The bottom of the baffle 454 is elastically connected to the inner wall of the collection box 451 by a spring sheet. A fork-shaped flip plate 456 is fixed to the side of the bottom of the swing rod 452 away from the filter screen 44. At the same time, the swing rod 452 drives the fork-shaped flip plate 456 to flip the impurities in the collection box 451, thereby avoiding the problem of impurities accumulating in the collection box 451.

[0025] A cleaning device 5 is provided below the opening and closing member 2. The cleaning device 5 comprises a plug ring 51. The plug ring 51 is fixed inside the valve body 1. A fixing ring 52 is fixed to the bottom of the plug ring 51. A swivel 53 is rotatably installed on the inner side of the fixing ring 52. A blade 54 is fixed to the inner side of the swivel 53. An elastic plate 55 is fixed to the bottom of the plug ring 51 away from the fixing ring 52. The elastic plate 55 is located on the movement trajectory of the blade 54. An impact rod 56 is fixed to the right side of the elastic plate 55. The side of the impact rod 56 away from the elastic plate 55 contacts the bottom of the plug ring 51. The bottom of the inner wall of the plug ring 51 is fixedly connected to one end of a conduction rod 57. The other end of the conduction rod 57 contacts the top of the inner wall of the plug ring 51. The blade 54 cooperates with the elastic plate 55 so that the blade 54 pushes the elastic plate 55 to drive the impact The rod 56 moves away from the plug ring 51. When the blade 54 does not push the elastic plate 55, the elastic plate 55 drives the impact rod 56 to knock on the plug ring 51 under the elastic force of the elastic plate 55. Under the conduction of the conduction rod 57, the conduction rod 57 vibrates and drives the upper end of the plug ring 51 to vibrate, thereby avoiding the problem of tiny impurities adhering to the plug ring 51, resulting in the problem of loose connection between the opening and closing member 2 and the plug ring 51. A guide plate 58 is fixed to the side of the bottom of the plug ring 51 away from the center of the plug ring 51, and a steel ball 59 is arranged above the guide plate 58. The steel ball 59 is elastically connected to the side of the conduction rod 57 close to the center of the plug ring 51 through an elastic rope. At the same time, the conduction rod guide rod 57 vibrates and drives the steel ball 59 to knock on the inner wall of the plug ring 51, thereby further improving the vibration effect of the plug ring 51.

[0026] When in use, during the process of fluid passing through the valve body 1, the impeller 32 is set so that the fluid drives the impeller 32 to rotate, and the impeller 32 drives the frame ring 33 to rotate, and the frame ring 33 respectively rotates the blade rod 34 and the spiral blade rod 35. The rotation of the spiral blade rod 35 will scrape off the impurities attached to the inner wall of the valve body 1, thereby avoiding the impurities adhering to the valve body 1 and causing the valve body 1 to be blocked. The rotation of the blade rod 34 will break up larger impurities, thereby avoiding the problem of large impurities easily clogging the pipeline.

[0027] At the same time, during the rotation of the frame plate ring 33, the frame plate ring 33 drives the convex ball block thereon to rotate along with it, and the convex ball block of the frame plate ring 33 cooperates with the convex ball of the elastic convex ball rod 36, so that the convex ball block of the frame plate ring 33 contacts the elastic convex ball rod 36 and moves away from the U-shaped frame 31. When the convex ball block of the frame plate ring 33 does not contact the elastic convex ball rod 36, under the elastic action of the elastic convex ball rod 36, the elastic convex ball rod 36 drives the convex ball thereon to knock the frame plate ring 33, and the frame plate ring 33 vibrates and drives the blade rod 34 and the spiral knife rod 35 to vibrate, and the blade rod 34 and the spiral knife rod 35 shake off the impurities attached thereto, thereby improving the efficiency of the blade rod 34 and the spiral knife rod 35 in processing impurities.

[0028] By setting the filter screen 44, the filter screen 44 can filter impurities in the fluid, thereby avoiding the problem that the impurities cause damage to the internal structure of the valve body 1. During the rotation of the impeller 32, the impeller 32 cooperates with the rotating rod 41, so that the impeller 32 drives the rotating rod 41 to rotate, and the rotating rod 41 drives the cleaning brush 43 to clean the filter screen 44 through the V-shaped plate 42, thereby avoiding the problem that the filter screen 44 is blocked and the fluid flow performance of the valve body 1 is affected; at the same time, the convex block of the elastic convex block rod 421 and the convex block of the filter screen 44 are connected. The blocks cooperate so that the protrusion of the filter screen 44 contacts the elastic protrusion rod 421 and moves away from the V-shaped plate 42, and the elastic protrusion rod 421 drives the knocking rod 422 to move. When the protrusion of the filter screen 44 does not contact the elastic protrusion rod 421, under the elastic force of the elastic protrusion rod 421, the elastic protrusion rod 421 drives the knocking rod 422 to knock on the V-shaped plate 42, and the V-shaped plate 42 vibrates and drives the cleaning brush 43 to vibrate. The cleaning brush 43 shakes off impurities attached to it, thereby improving the cleaning efficiency of the cleaning brush 43 on the filter screen 44.

[0029] During the rotation of the V-shaped plate 42, the V-shaped plate 42 cooperates with the swing rod 452, so that the V-shaped plate 42 pushes the swing rod 452 to swing, and the swing rod 452 drives the arc-shaped resistance rod 453 to push the baffle 454, so that the impurities cleaned by the cleaning brush 43 fall into the collection box 451, thereby achieving the purpose of collecting the impurities. At the same time, the setting of the baffle 454 avoids the problem of impurities in the collection box 451 rushing out; at the same time, the swing rod 452 drives the fork-shaped flip plate 456 to flip the impurities in the collection box 451, thereby avoiding the problem of impurities in the collection box 451 accumulating.

[0030] At the same time, the fluid drives the rotating ring 53 to rotate through the blade 54, and the blade 54 cooperates with the elastic plate 55, so that the blade 54 pushes the elastic plate 55 to drive the impact rod 56 to move away from the plug ring 51. When the blade 54 does not push the elastic plate 55, the elastic force of the elastic plate 55 drives the impact rod 56 to knock on the plug ring 51. Under the conduction of the conduction rod 57, the conduction rod 57 vibrates and drives the upper end of the plug ring 51 to vibrate, thereby avoiding the problem of tiny impurities adhering to the plug ring 51, resulting in the opening and closing member 2 and the plug ring 51 being not tightly connected; at the same time, the conduction rod guide rod 57 vibrates and drives the steel ball 59 to knock on the inner wall of the plug ring 51, thereby further improving the vibration effect of the plug ring 51.

[0031] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A pilot-operated pressure reducing valve with self-dredging and anti-blocking functions, comprising a valve body (1), characterized in that: An opening and closing member (2) is provided in the middle of the interior of the valve body (1), and an anti-blocking device (3) is provided on one side of the water inlet of the valve body (1). The anti-blocking device (3) comprises a U-shaped frame (31), the U-shaped frame (31) is fixed inside the valve body (1), an impeller (32) is rotatably mounted on the left side of the U-shaped frame (31), a frame plate ring (33) is fixed on the left side of the impeller (32), a blade rod (34) is fixed on the middle of the left side of the frame plate ring (33), and a spiral blade rod (35) is fixed on the left side of the frame plate ring (33) away from the blade rod (34).

2. A pilot-operated pressure reducing valve with self-dredging and anti-blocking function according to claim 1, characterized in that: The spiral blade rod (35) contacts the inner wall of the valve body (1), and there are a plurality of blade rods (34), which are evenly arranged in the middle of the left side of the frame plate ring (33).

3. The pilot-operated pressure reducing valve with self-dredging and anti-blocking function according to claim 1, characterized in that: The top and bottom of the inner wall of the U-shaped frame (31) are both fixed with elastic convex ball rods (36), a convex ball is fixed on the side of the elastic convex ball rod (36) away from the U-shaped frame (31), a convex ball block is fixed on the inner side of the frame plate ring (33), and the convex ball block of the frame plate ring (33) is in contact with the convex ball of the elastic convex ball rod (36).

4. The pilot-operated pressure reducing valve with self-dredging and anti-blocking function according to claim 1, characterized in that: A filter device (4) is provided on a side of the anti-blocking device (3) close to the opening and closing member (2), and the filter device (4) comprises a rotating rod (41), the rotating rod (41) penetrates and is rotatably mounted on the right side of the U-shaped frame (31), the rotating rod (41) is fixed to the right side of the impeller (32), a V-shaped plate (42) is fixed to the right side of the rotating rod (41), a cleaning brush (43) is fixed to the right side of the V-shaped plate (42), the right side of the cleaning brush (43) is in contact with the left side of a filter screen (44), the filter screen (44) is fixed on the inner wall of the valve body (1), and a collecting device (45) is provided below the filter screen (44).

5. The pilot-operated pressure reducing valve with self-dredging and anti-blocking function according to claim 4, characterized in that: The collecting device (45) comprises a collecting box (451), the collecting box (451) is embedded in the bottom of the valve body (1), the interior of the collecting box (451) is connected to the interior of the valve body (1), the inner wall of the collecting box (451) close to the filter screen (44) is hinged to the middle of the swing rod (452), the left and right sides of the swing rod (452) are both fixed with arc-shaped abutting rods (453), the left and right sides of the inner wall of the collecting box (451) are both hinged with baffles (454), the bottom of the baffle (454) is elastically connected to the inner wall of the collecting box (451) via a spring sheet, and the bottom of the swing rod (452) is fixed with a fork-shaped flip plate (456) on the side away from the filter screen (44).

6. The pilot-operated pressure reducing valve with self-dredging and anti-blocking function according to claim 4, characterized in that: An elastic protrusion rod (421) is fixed to the left side of the V-shaped plate (42); a knocking rod (422) is fixed to the side of the elastic protrusion rod (421) close to the V-shaped plate (42); a side of the knocking rod (422) away from the elastic protrusion rod (421) contacts the V-shaped plate (42); a protrusion is fixed to the side of the elastic protrusion rod (421) away from the V-shaped plate (42); a protrusion is fixed to the left edge of the filter screen (44); and the protrusion of the elastic protrusion rod (421) contacts the protrusion of the filter screen (44).

7. The pilot-operated pressure reducing valve with self-dredging and anti-blocking function according to claim 5, characterized in that: The top of the baffle (454) contacts a side of the arc-shaped abutting rod (453) away from the swing rod (452), and the swing rod (452) is located on the movement track of the V-shaped plate (42).

8. The pilot-operated pressure reducing valve with self-dredging and anti-blocking functions according to claim 1, characterized in that: A cleaning device (5) is provided below the opening and closing member (2), and the cleaning device (5) comprises a plug ring (51), the plug ring (51) is fixed inside the valve body (1), a fixing ring (52) is fixed at the bottom of the plug ring (51), a rotating ring (53) is rotatably mounted inside the fixing ring (52), a blade (54) is fixed inside the rotating ring (53), an elastic plate (55) is fixed at the bottom of the plug ring (51) away from the fixing ring (52), a striking rod (56) is fixed at the right side of the elastic plate (55), the bottom of the inner wall of the plug ring (51) is fixedly connected to one end of a conducting rod (57), and the other end of the conducting rod (57) is in contact with the top of the inner wall of the plug ring (51).

9. The pilot-operated pressure reducing valve with self-dredging and anti-blocking functions according to claim 8, characterized in that: A guide plate (58) is fixed to the bottom of the plug ring (51) at a side away from the center of the plug ring (51), and a steel ball (59) is arranged above the guide plate (58). The steel ball (59) is elastically connected to the side of the conductive rod (57) close to the center of the plug ring (51) through an elastic rope.

10. The pilot-operated pressure reducing valve with self-dredging and anti-blocking functions according to claim 8, characterized in that: The side of the impact rod (56) away from the elastic plate (55) contacts the bottom of the plug ring (51), and the elastic plate (55) is located on the movement trajectory of the blade (54).

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