Self-operated pressure regulating valve with emergency switching to prevent spring diaphragm breakage

Abstract

The application discloses a self-operated pressure regulating valve with emergency switching for preventing spring diaphragm damage, relates to the technical field of self-operated pressure regulating valves, and comprises a pressure regulating valve body, a liquid inlet pipe being fixedly communicated with the left end of the pressure regulating valve body, and a switching and cleaning mechanism and a fixed sealing mechanism, wherein the switching and cleaning mechanism and the fixed sealing mechanism are arranged on the pressure regulating valve body. The self-operated pressure regulating valve with emergency switching for preventing spring diaphragm damage can prevent the problem that part of the substances may be deposited and accumulated in the pressure regulating valve body when the medium passes through the pressure regulating valve body, avoid the problem that the accumulated impurities cause the pressure regulating valve body to be blocked, the flow capacity in the pressure regulating valve body to be reduced, and the pressure in the pressure regulating valve body to be unstable, thus causing the spring diaphragm in the self-operated pressure regulating valve to be blocked and damaged, and further ensure the service life of the spring diaphragm in the pressure regulating valve body and improve the precision and stability of the pressure regulating valve body during work.

Description

Technical Field

[0001] This invention relates to the field of self-operated pressure regulating valve technology, specifically to a self-operated pressure regulating valve for emergency switching to prevent damage to the spring diaphragm. Background Technology

[0002] Self-operated regulating valves, also known as self-controlled valves, are a type of regulating valve that relies on the pressure and temperature of the medium flowing through the valve itself as an energy source to drive the valve to work automatically. They do not require an external power supply or secondary instruments. They are automatic pressure regulating devices with advantages such as high stability, low maintenance costs, and convenient installation. Self-operated pressure regulating valves are divided into two categories according to the location of the pressure tapping point: upstream and downstream. When the pressure tapping point is upstream, it is used to regulate the upstream pressure to remain constant; when the pressure tapping point is downstream, it is used to regulate the downstream pressure to remain constant.

[0003] The self-operated pressure regulating valve has a relatively simple structure, mainly composed of a valve body, valve disc, spring, guide, and adjusting nut. Its working principle is to regulate the pressure by adjusting the pressure of the spring diaphragm and the opening of the valve disc. When the input fluid pressure increases, the valve disc contracts, reducing the flow area of ​​the output fluid and thus reducing the pressure of the output fluid. Conversely, when the input fluid pressure decreases, the valve disc opens, increasing the flow area of ​​the output fluid and thus increasing the pressure of the output fluid. Therefore, the spring diaphragm is an important component in the self-operated pressure regulating valve.

[0004] In the prior art, when using self-operated pressure regulating valves, the conveyed medium may contain solid particles, suspended matter, etc. As the medium passes through the self-operated pressure regulating valve, some of these substances may deposit and accumulate inside the valve. The accumulation of impurities may block the channels, gaps, or pores inside the regulating valve, reducing the flow capacity of the regulating valve, or even completely blocking the flow of fluid. This results in unstable internal pressure of the self-operated pressure regulating valve, causing the spring diaphragm of the self-operated pressure regulating valve to wear due to obstructed movement, thus affecting the normal use of the self-operated pressure regulating valve.

[0005] Therefore, a self-operated pressure regulating valve with emergency switching to prevent damage to the spring diaphragm was proposed to solve the above problems. Summary of the Invention

[0006] In view of this, the technical problem to be solved by the present invention is to propose a self-operated pressure regulating valve for emergency switching to prevent damage to the spring diaphragm, so as to solve the problem that impurities accumulate in the self-operated pressure regulating valve in the prior art, which leads to obstruction of the movement of the spring diaphragm and wear.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a self-operated pressure regulating valve for emergency switching to prevent damage to a spring diaphragm, comprising a pressure regulating valve body, wherein an inlet pipe is fixedly connected to the left end of the pressure regulating valve body, and the self-operated pressure regulating valve for emergency switching to prevent damage to a spring diaphragm includes: a switching cleaning mechanism and a fixed sealing mechanism, wherein the fixed sealing mechanism is disposed outside the switching cleaning mechanism; The switching cleaning mechanism is used to pre-filter impurities entering the pressure regulating valve body; The fixed sealing mechanism is used to fix the switching cleaning mechanism.

[0008] Preferably, the switching cleaning mechanism includes a sliding plate that is slidably connected to the outer surface of the inlet pipe. Mounting blocks are symmetrically fixedly connected to the top of the sliding plate, and a drive motor is fixedly connected to the upper surface of the inlet pipe. A threaded rod is fixedly connected to the output end of the drive motor, and the threaded rod is threadedly connected to one of the mounting blocks.

[0009] Preferably, each mounting block is fixedly connected to a connecting rod on the side near the drive motor, and each connecting rod is fixedly connected to a protrusion at equal intervals on the side away from the threaded rod, and each protrusion is set to be hemispherical.

[0010] Preferably, two fixing blocks are fixedly connected to the outer surface of the liquid inlet pipe. Guide slides are symmetrically slidably connected through the left side of each fixing block. A brush plate is fixedly connected to the side of each adjacent guide slide near the sliding plate, and a fixing rod is fixedly connected to the side of each adjacent guide slide away from the brush plate. A return spring is fixedly connected between the fixing rod and the fixing block.

[0011] Preferably, each of the fixed blocks is rotatably connected to a rotating push rod at its top, and each of the rotating push rods is rotatably connected to a pushing block on the side of their tops close to each other. Each pushing block and the rotating push rod is fixedly connected to a limiting magnetic block on the side of their close proximity. The limiting magnetic blocks are in contact with each other, and the magnetic properties of the limiting magnetic blocks on the side of their close proximity are opposite. The pushing block is adapted to the protrusion.

[0012] Preferably, filter screens are symmetrically slidably connected to the sliding plate on the side away from the pressure regulating valve body, and the filter screens all penetrate the sliding plate.

[0013] Preferably, the fixing and sealing mechanism includes a positioning frame, which is symmetrically fixedly connected to the outer wall of the sliding plate, and the outer surface of the filter screen cylinder is symmetrically fixedly connected with a locking block, which is engaged with the sliding plate.

[0014] Preferably, the sliding plate has symmetrical mounting grooves at both ends, and an L-shaped sliding rod is slidably connected in the mounting groove. The L-shaped sliding rod is L-shaped.

[0015] Preferably, each of the L-shaped slide rods is fixedly connected to a sliding magnetic block at one end near the push block, and the sliding magnetic blocks are slidably connected to the mounting groove. Fixed magnetic blocks are fitted into both the upper and lower ends of the push block, and the magnetic properties of the sliding magnetic blocks and the fixed magnetic blocks on the side closest to each other are opposite.

[0016] Compared with the prior art, the present invention provides a self-operated pressure regulating valve for emergency switching to prevent damage to the spring diaphragm, which has the following beneficial effects: 1. During use, when the medium enters the pressure regulating valve body from the inlet pipe, the filter screen in the inlet pipe can block solid particles, suspended matter and other impurities in the medium. This prevents some of these substances from depositing and accumulating inside the pressure regulating valve body as the medium passes through it. This avoids the problem of these accumulated impurities causing blockage inside the pressure regulating valve body, reducing the flow capacity of the pressure regulating valve body, and causing unstable pressure inside the pressure regulating valve body. This can lead to the problem of the spring diaphragm inside the self-operated pressure regulating valve being obstructed and worn. In this way, the service life of the spring diaphragm inside the pressure regulating valve body is guaranteed, and the accuracy and stability of the pressure regulating valve body during operation are improved. 2. The reciprocating movement of the brush plate allows the bristles to enter the mesh of the filter cylinder, cleaning the impurities clogging the mesh and removing deposits and contaminants. This eliminates the need for workers to clean the filter cylinder mesh itself when it is subsequently disassembled for cleaning, thus reducing the time required for cleaning and improving the efficiency of filter cylinder cleaning. 3. By automatically replacing and cleaning the filter cylinder simultaneously, the cleaning efficiency of the filter cylinder is further improved. At the same time, the brush plate only cleans the used filter cylinder. Furthermore, through the setting of the push block, limit magnetic block and rotating push rod, the brush plate will not move back and forth to clean the filter cylinder when the new filter cylinder slides into the liquid inlet pipe, thereby reducing the wear of the brush plate and thus improving the service life of the brush plate. 4. By automatically fixing and unfixing the filter cylinder to the sliding plate during the filter cylinder replacement process, the operation of detaching and fixing the filter cylinder to the sliding plate is more convenient. Furthermore, the L-shaped sliding rod's locking mechanism prevents the filter cylinder from shaking or even detaching from the sliding plate while in the inlet pipe, ensuring stable and normal operation. The positioning frame further limits the filter cylinder's movement when it enters the inlet pipe, preventing it from sliding out of the inlet pipe due to excessive sliding distance, thus improving the stability of the filter cylinder replacement process. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 For the present invention Figure 1 Left-side three-dimensional structure diagram; Figure 3 For the present invention Figure 2 Partial three-dimensional structure diagram; Figure 4 For the present invention Figure 3 Enlarged structural diagram at point A in the middle; Figure 5 For the present invention Figure 3 3D structural diagram of the middle brush plate; Figure 6 For the present invention Figure 3 Mid-top view of the three-dimensional structure; Figure 7 This is a partial longitudinal sectional view of the sliding plate of the present invention; Figure 8 This is a partial transverse cross-sectional view of the sliding plate of the present invention; Figure 9 For the present invention Figure 8 Enlarged structural diagram at point B In the picture: 1. Pressure regulating valve body; 2. Liquid inlet pipe; 301. Sliding plate; 302. Mounting block; 303. Drive motor; 304. Threaded rod; 305. Connecting rod; 306. Protrusion; 307. Fixing block; 308. Guide slide column; 309. Fixing rod; 310. Return spring; 311. Brush plate; 312. Rotating push rod; 313. Pushing block; 314. Limiting magnetic block; 315. Filter screen cylinder; 401. Positioning frame; 402. Locking block; 403. Mounting slot; 404. L-shaped slide bar; 405. Sliding magnetic block; 406. Fixing magnetic block. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0020] Embodiments of the present invention: Please refer to Figures 1 to 6 As shown: To address the problems mentioned in the technical solutions, this application provides a self-operated pressure regulating valve for emergency switching to prevent damage to the spring diaphragm, comprising a pressure regulating valve body 1, with an inlet pipe 2 fixedly connected to the left end of the pressure regulating valve body 1. The self-operated pressure regulating valve for emergency switching to prevent damage to the spring diaphragm includes: a switching cleaning mechanism and a fixed sealing mechanism, with the fixed sealing mechanism disposed outside the switching cleaning mechanism. The switching cleaning mechanism is used to pre-filter impurities entering the pressure regulating valve body 1, and the fixed sealing mechanism is used to fix the switching cleaning mechanism. The switching cleaning mechanism includes a sliding plate 301, which is slidably connected to the outer surface of the inlet pipe 2. Mounting blocks 302 are symmetrically fixedly connected to the top of the sliding plate 301. A drive motor 303 is fixedly connected to the upper surface of the inlet pipe 2. A threaded rod 304 is fixedly connected to the output end of the drive motor 303. The threaded rod 304 is threadedly connected to one of the mounting blocks 302. Connecting rods 305 are fixedly connected to the side of each mounting block 302 near the drive motor 303. Protrusions 306 are equidistantly fixedly connected to the side of each connecting rod 305 away from the threaded rod 304. Two fixing blocks 307 are fixedly connected to the outer surface of the inlet pipe 2. Guide slide pillars 308 are symmetrically slidably connected to the left side of each fixing block 307. Brush plates 311 are fixedly connected to the side of each adjacent guide slide pillar 308 near the sliding plate 301, and fixing blocks 306 are fixedly connected to the side of each adjacent guide slide pillar 308 away from the brush plates 311. A return spring 310 is fixedly connected between rod 309 and fixed block 307. Rotary push rods 312 are rotatably connected to the top of fixed block 307. Push blocks 313 are rotatably connected to the top of the top of the rotary push rods 312 on the same side. Limiting magnetic blocks 314 are fixedly connected to the push blocks 313 and the rotary push rods 312 on the same side. The limiting magnetic blocks 314 are in contact with each other. The magnetic properties of the limiting magnetic blocks 314 on the same side are opposite. Push blocks 313 are adapted to protrusions 306. Filter screens 315 are symmetrically slidably connected to the side of sliding plate 301 away from pressure regulating valve body 1. Filter screens 315 all penetrate sliding plate 301. Among them, the protrusions 306 are all set as hemispherical, which can drive the push block 313 to rotate when moving, and assist the brush plate 311 in completing the cleaning work of the filter cylinder 315; The push block 313 is rotatably connected to the upper end of the rotating push rod 312 on the side close to it. The push block 313 can only rotate in the direction of the liquid inlet pipe 2 and cannot rotate in the direction away from the liquid inlet pipe 2.

[0021] In the prior art, when using a self-operated pressure regulating valve, the medium being transported may contain solid particles, suspended matter, etc. As the medium passes through the self-operated pressure regulating valve, some of these substances may deposit and accumulate inside the regulating valve. The accumulation of impurities may block the channels, gaps, or pores inside the regulating valve, reducing the flow capacity of the regulating valve. Compared with the prior art, the implementation of this embodiment ensures the service life of the spring diaphragm inside the pressure regulating valve body 1 and improves the accuracy and stability of the pressure regulating valve body 1 during operation. Through the reciprocating movement of the brush plate 311, the bristles of the brush plate 311 can enter the mesh of the filter screen cylinder 315. The bristles clean the impurities blocking the mesh of the filter screen cylinder 315, removing the deposits and contaminants inside the mesh. Therefore, when the filter screen cylinder 315 is subsequently disassembled and cleaned by the staff, the cleaning work done in advance by the brush plate 311 saves the staff the step of cleaning the mesh of the filter screen cylinder 315, thereby reducing the time for the staff to clean the filter screen cylinder 315 and improving the cleaning efficiency of the filter screen cylinder 315.

[0022] Further examples: Please refer to Figures 7 to 9 As shown: The fixed sealing mechanism includes a positioning frame 401, which is symmetrically fixedly connected to the outer wall of the sliding plate 301. The outer surface of the filter screen cylinder 315 is symmetrically fixedly connected with a locking block 402, which is engaged with the sliding plate 301. The sliding plate 301 has symmetrically opened mounting grooves 403 at both ends. An L-shaped slide rod 404 is slidably connected in the mounting groove 403. The L-shaped slide rod 404 is L-shaped. A sliding magnetic block 405 is fixedly connected to one end of the L-shaped slide rod 404 near the push block 313. The sliding magnetic block 405 is slidably connected to the mounting groove 403. Fixed magnetic blocks 406 are embedded at both the upper and lower ends of the push block 313. The magnetic properties of the sliding magnetic block 405 and the fixed magnetic block 406 on the side closest to each other are opposite. The fixed magnetic block 406 and the sliding magnetic block 405 are configured such that when the filter screen cylinder 315 enters the liquid inlet pipe 2, under the influence of the attraction of the fixed magnetic block 406 and the sliding magnetic block 405, the L-shaped slide rod 404 automatically engages with the locking block 402. When the filter screen cylinder 315 slides out of the liquid inlet pipe 2, the L-shaped slide rod 404 automatically disengages from the locking block 402.

[0023] In this embodiment, the fixing and unfixing operations of the filter cylinder 315 and the sliding plate 301 are automatically completed during the replacement of the filter cylinder 315, making the separation and fixing of the filter cylinder 315 and the sliding plate 301 more convenient. Furthermore, the L-shaped sliding rod 404 engages and fixes the locking block 402, preventing the filter cylinder 315 from shaking or even detaching from the sliding plate 301 and failing to perform filtration when it is in the liquid inlet pipe 2. This ensures the normal and stable operation of the filter cylinder 315. Additionally, the positioning frame 401 limits the movement of the filter cylinder 315 when it enters the liquid inlet pipe 2, preventing the sliding plate 301 from causing the filter cylinder 315 to slide too far and slip out of the liquid inlet pipe 2, thus improving the stability of the filter cylinder 315 replacement process.

[0024] The working principle of all the content in the above embodiments is as follows: In the initial state: the two filter cylinders 315, with the rear filter cylinder 315 located inside the liquid inlet pipe 2 and the front filter cylinder 315 located outside the liquid inlet pipe 2, the L-shaped sliding rod 404 located on the front side is in a state of disengagement from the locking block 402 under the influence of the attraction of the fixed magnetic block 406. At this time, the filter cylinder 315 and the locking block 402 can be disengaged from the sliding plate 301 by manually pulling.

[0025] The following is the working process of the switching cleaning mechanism for pre-filtering impurities entering the pressure regulating valve body 1: When the medium enters the pressure regulating valve body 1 from the inlet pipe 2, the filter screen 315 in the inlet pipe 2 can block solid particles, suspended matter and other impurities in the medium, thereby preventing some of these substances from depositing and accumulating inside the pressure regulating valve body 1 as the medium passes through it. This avoids the problem of these accumulated impurities causing blockage inside the pressure regulating valve body 1, reducing the flow capacity inside the pressure regulating valve body 1, and causing unstable pressure inside the pressure regulating valve body 1, which would lead to the wear of the spring diaphragm inside the self-operated pressure regulating valve due to obstructed movement. In this way, the service life of the spring diaphragm inside the pressure regulating valve body 1 is guaranteed, and the accuracy and stability of the pressure regulating valve body 1 during operation are improved. Furthermore, when the filter screen 315 located in the inlet pipe 2 has been used for a long time, the operator can start the drive motor 303. The output end of the drive motor 303 rotates forward and backward, driving the threaded rod 304 to rotate forward and backward. Since the threaded rod 304 is threadedly connected to the mounting block 302, and the sliding plate 301 is slidably connected to the pressure regulating valve body 1, the rotation of the threaded rod 304 can drive the sliding plate 301 and the mounting block 302 to slide back and forth. The sliding of the mounting block 302 drives the connecting rod 305 to slide back and forth. Then, because the pushing block 313 is close to the upper end of the rotating push rod 312, the operation is further accelerated. The rotating connection allows the push block 313 to rotate only towards the inlet pipe 2, not away from it. Therefore, when the front or rear protrusion 306 moves towards the inlet pipe 2, it will press the push block 313, causing it to rotate backward. This disengages the two limiting magnetic blocks 314. When the protrusion 306 and the push block 313 are misaligned, the limiting magnetic blocks 314 re-engage under their attraction, thus resetting the push block 313 for the next operation.

[0026] Furthermore, when the front or rear protrusion 306 slides away from the inlet pipe 2, and the front or rear protrusion 306 presses against the pushing block 313, the pushing block 313 will be blocked by the rotating push rod 312 and the limiting magnetic block 314, preventing the pushing block 313 from flipping. At this time, the protrusion 306 can press against the pushing block 313, causing it and the upper end of the rotating push rod 312 to rotate away from the protrusion 306 together. This causes the lower end of the rotating push rod 312 to rotate and move closer to the fixed rod 309, thus pushing the fixed rod 309 to move towards the fixed block 307, thereby causing the guide slide... The column 308 slides and drives the brush plate 311 towards the filter cylinder 315, and the return spring 310 is compressed. Therefore, as described above, driven by the drive motor 303 and the threaded rod 304, when a new filter cylinder 315 enters the inlet pipe 2 from the outside, the protrusion 306 cannot cause the rotating push rod 312 to rotate, thus preventing the brush plate 311 from cleaning the new filter cylinder 315. However, when a saturated filter cylinder 315 slides out of the inlet pipe 2, the protrusion 306 will squeeze the push block 313 and the rotating push rod 312 to rotate, thereby causing the brush plate 311 to... By repeatedly moving away from and towards the filter cylinder 315, the brush plate 311's bristles can enter the mesh openings of the filter cylinder 315 through its reciprocating movement. The bristles clean the impurities clogging the mesh openings, removing deposits and contaminants. This pre-cleaning by the brush plate 311 eliminates the need for workers to clean the filter cylinder 315 mesh openings themselves when the filter cylinder 315 is subsequently disassembled and cleaned outside the inlet pipe 2, thus reducing the time spent cleaning the filter cylinder 315. This improves the efficiency of cleaning the filter cylinder 315. Simultaneously, the replacement and cleaning of the filter cylinder 315 are performed automatically, further enhancing the cleaning efficiency. Furthermore, the brush plate 311 only cleans used filter cylinders 315. Through the design of the push block 313, the limiting magnetic block 314, and the rotating push rod 312, the brush plate 311 does not reciprocate to clean the filter cylinder 315 when a new filter cylinder 315 slides into the liquid inlet pipe 2, thus reducing the wear and tear on the brush plate 311 and extending its service life. Please refer to the above work process. Figures 1 to 6 The following describes the working process of the fixed sealing mechanism used to fix the switching cleaning mechanism: When the filter cylinder 315 is replaced, driven by the drive motor 303 and the threaded rod 304, the new filter cylinder 315 slides into the liquid inlet pipe 2. The L-shaped slide rod 404 and the sliding magnetic block 405 move closer to the front fixed magnetic block 406, thus entering the attraction range of the fixed magnetic block 406. Under the influence of the attraction of the fixed magnetic block 406 on the sliding magnetic block 405, as the L-shaped slide rod 404 slides into the liquid inlet pipe 2, when the L-shaped slide rod 404 and the sliding magnetic block 405 move to the rear of the fixed magnetic block 406, due to the attraction of the fixed magnetic block 406... With block 406 remaining in position, the L-shaped slide rod 404 and the sliding magnetic block 405 are driven by the attraction of the fixed magnetic block 406 to slide along the mounting groove 403 toward the locking block 402, thereby engaging the L-shaped slide rod 404 with the locking block 402. When the saturated filter cylinder 315 slides out of the inlet pipe 2, and the L-shaped slide rod 404 and the sliding magnetic block 405 slide from the inlet pipe 2 past the fixed magnetic block 406, the sliding magnetic block 405 enters the attraction range of the fixed magnetic block 406. Then, under the influence of the attraction of the fixed magnetic block 406, the sliding magnetic block 405 is driven... Block 405 and L-shaped slide bar 404 slide along mounting groove 403, causing L-shaped slide bar 404 to disengage from locking block 402 and return to its initial state. At this time, filter cylinder 315 and locking block 402 can be manually pulled away from sliding plate 301. Thus, by automatically completing the fixing and unfixing operations of filter cylinder 315 and sliding plate 301 during the replacement of filter cylinder 315, the operation of fixing and unfixing filter cylinder 315 and sliding plate 301 is made more convenient. Furthermore, the L-shaped slide bar 404 locks the locking block 402. The snap-fit ​​fixing of 2 prevents the filter screen cylinder 315 from shaking or even falling off the sliding plate 301 when it is in the liquid inlet pipe 2, thus preventing it from failing to perform the filtration work. This ensures the normal and stable operation of the filter screen cylinder 315. Furthermore, the positioning frame 401 limits the movement of the filter screen cylinder 315 when it enters the liquid inlet pipe 2, preventing the sliding plate 301 from causing the filter screen cylinder 315 to slide too far and slip out of the liquid inlet pipe 2. This improves the stability of the filter screen cylinder 315 replacement process. Please refer to the above work process. Figures 7 to 9 .

[0027] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0028] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A self-operated pressure regulating valve for emergency switching to prevent diaphragm breakage, comprising a pressure regulating valve body (1), wherein an inlet pipe (2) is fixedly connected to the left end of the pressure regulating valve body (1), characterized in that, The self-operated pressure regulating valve for emergency switching to prevent spring diaphragm breakage includes: a switching cleaning mechanism and a fixed sealing mechanism, wherein the fixed sealing mechanism is disposed on the outside of the switching cleaning mechanism. The switching cleaning mechanism is used to pre-filter impurities entering the pressure regulating valve body (1); The fixed sealing mechanism is used to fix the switching cleaning mechanism; The switching cleaning mechanism includes a sliding plate (301), which is slidably connected to the outer surface of the liquid inlet pipe (2). The top of the sliding plate (301) is symmetrically fixedly connected to mounting blocks (302). The upper surface of the liquid inlet pipe (2) is fixedly connected to a drive motor (303). The output end of the drive motor (303) is fixedly connected to a threaded rod (304). The threaded rod (304) is threadedly connected to one of the mounting blocks (302). Each mounting block (302) is fixedly connected to a connecting rod (305) on the side near the drive motor (303), and each connecting rod (305) is fixedly connected to a protrusion (306) at equal intervals on the side away from the threaded rod (304), and each protrusion (306) is set to be hemispherical. Two fixing blocks (307) are fixedly connected to the outer surface of the liquid inlet pipe (2). Guide slides (308) are symmetrically slidably connected through the left side of each fixing block (307). Brush plates (311) are fixedly connected to the side of each adjacent guide slide (308) near the sliding plate (301). Fixing rods (309) are fixedly connected to the side of each adjacent guide slide (308) away from the brush plates (311). A return spring (310) is fixedly connected between the fixing rod (309) and the fixing block (307). The top of each fixed block (307) is rotatably connected to a rotating push rod (312). The top of each rotating push rod (312) is rotatably connected to a pushing block (313) on the side close to each other. The pushing block (313) and the rotating push rod (312) are fixedly connected to a limiting magnetic block (314). The limiting magnetic blocks (314) are in contact with each other. The magnetic properties of the limiting magnetic blocks (314) on the side close to each other are opposite. The pushing block (313) is adapted to the protrusion (306). The pushing block (313) can only be flipped in the direction of the liquid inlet pipe (2) and cannot be flipped away from the liquid inlet pipe (2). The sliding plate (301) is symmetrically connected to a filter screen cylinder (315) on the side away from the pressure regulating valve body (1), and the filter screen cylinder (315) all penetrate the sliding plate (301). When the front or rear protrusion (306) slides away from the liquid inlet pipe (2), the front or rear protrusion (306) squeezes the push block (313). The push block (313) will be blocked by the rotating push rod (312) and the limiting magnetic block (314), so that the push block (313) cannot be flipped. At this time, the protrusion (306) can squeeze the push block (313) to make it and the upper end of the rotating push rod (312) rotate away from the protrusion (306), so that the lower end of the rotating push rod (312) rotates and moves closer to the fixed rod (309), and then pushes the fixed rod (309) to move towards the fixed block (307), thereby making the guide slide (308) slide and drive the brush plate (311) to move closer to the filter cylinder (315), and the reset spring (310) is compressed.

2. The self-operated pressure regulating valve for emergency switching to prevent damage to the spring diaphragm as described in claim 1, characterized in that: The fixed sealing mechanism includes a positioning frame (401), which is symmetrically fixedly connected to the outer wall of the sliding plate (301). The outer surface of the filter cylinder (315) is symmetrically fixedly connected with a locking block (402), which is engaged with the sliding plate (301).

3. The self-operated pressure regulating valve for emergency switching to prevent damage to the spring diaphragm as described in claim 2, characterized in that: The sliding plate (301) has symmetrically provided mounting grooves (403) at both ends, and an L-shaped sliding rod (404) is slidably connected in the mounting groove (403). The L-shaped sliding rod (404) is L-shaped.

4. The self-operated pressure regulating valve for emergency switching to prevent damage to the spring diaphragm as described in claim 3, characterized in that: Each of the L-shaped slide rods (404) has a sliding magnetic block (405) fixedly connected to one end near the push block (313). The sliding magnetic blocks (405) are slidably connected to the mounting groove (403). Fixed magnetic blocks (406) are embedded at both the upper and lower ends of the push block (313). The magnetic properties of the sliding magnetic blocks (405) and the fixed magnetic blocks (406) on the side closest to each other are opposite.

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