Corrosion-resistant alarm valve for chemical industry

Abstract

The invention relates to the technical field of valves, in particular to a chemical anti-corrosion alarm valve which comprises a valve body and a stop block arranged in an inner cavity of the valve body, a signal valve deck is arranged at the top of the valve body, a lifting valve element with the bottom attached to the inner wall of the stop block is slidably arranged in the signal valve deck, and a pressure spring is arranged at the top end of the lifting valve element. The water outlet end of the valve body is connected with a stable-pressure water outlet pipe, an anti-corrosion device is arranged in an inner cavity of the water outlet end of the valve body, and a magnetic block magnetically connected with the anti-corrosion device is arranged on the outer wall of the water outlet end of the valve body in a sliding mode.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and particularly to an anti-corrosion alarm valve for chemical industry use. Background Art

[0002] An alarm valve is a core control component in an automatic sprinkler fire extinguishing system, which is used to connect or cut off the water source during a fire, trigger an alarm signal and start fire-fighting linkage equipment. The alarm valve is a one-way valve, and the opening or closing of the valve flap is achieved through pressure changes to control the water flow into the fire extinguishing pipe network. It is automatically or manually opened during a fire to allow the water flow to enter the pipe network for fire extinguishing, and can cooperate with devices such as a hydraulic alarm bell and a pressure switch to emit audible and visual alarms, and link the fire pump. During a fire, the fire sprinkler will be heated and burst, and the water flow in the pipeline will be sprayed outwards, resulting in a decrease in the system-side pressure of the alarm valve. Then, the valve flap is opened for water supply through the pressure difference. At the same time, the water flow triggers the alarm device, which is sensitive and can effectively prevent the spread of fire.

[0003] Although the above-mentioned prior art can solve corresponding technical problems, there are still certain defects: when the existing alarm valve is used in a chemical plant, if a deflagration occurs in the workshop where the alarm valve is installed in the chemical plant, and the fire has not spread to the position where the fire sprinkler is installed, at this time, the alarm valve will be roasted by the high-temperature flame, causing the water inside to evaporate rapidly due to the high temperature, which will cause the pressure inside the cavity of the alarm valve to rise sharply, easily resulting in an abnormal increase in the pressure at the output end of the alarm valve and non-normal triggering of the fire sprinkler, leading to water leakage. At the same time, it is also difficult to directly extinguish the fire in the workshop where the alarm valve is located, easily causing the spread of the fire. And during a fire, the flame is likely to cause the leakage of chemical raw materials, and at the same time burn out the water delivery pipeline, easily causing the chemical raw materials in the chemical plant to mix into the water delivery pipeline and be sent into the alarm valve along with the water flow, and adhere to the inner wall of the alarm valve body. If the chemical raw materials have certain corrosiveness, it is very easy to cause the inner wall of the alarm valve body to be corroded and damaged after a period of time, affecting the service life of the alarm valve. Summary of the Invention

[0004] The purpose of the present invention is to provide an anti-corrosion alarm valve for chemical industry use that is not prone to high pressure inside the pipe and has a long service life in view of the defects and deficiencies of the prior art.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions: an anti-corrosion alarm valve for chemical industry use, including a valve body and a blocking block arranged in the inner cavity of the valve body. A signal valve cover is provided at the top of the valve body. An elevating valve core with the bottom fitting the inner wall of the blocking block is slidably arranged in the signal valve cover. A pressure spring is provided at the top end of the elevating valve core. A pressure-stabilizing water outlet pipe is connected to the water outlet end of the valve body. An anti-corrosion device is arranged in the inner cavity of the water outlet end of the valve body. A magnetic block magnetically connected to the anti-corrosion device is slidably arranged on the outer wall of the water outlet end of the valve body.

[0006] Further improvements are as follows: The pressure-stabilized water outlet pipe includes a pipe body and a pressure-regulating valve penetrating and arranged on the outer wall of the pipe body.

[0007] Further improvements are as follows: The inner wall of the pipe body is provided with a heat-insulating coating, and a vacuum interlayer is also provided inside the pipe body.

[0008] Further improvements are as follows: The end of the pipe body is provided with a connecting flange.

[0009] Further improvements are as follows: The pressure-regulating valve includes a lead-out pipe penetrating and arranged on the outer wall of the pipe body and an inwardly retracted block integrally formed at the bottom of the outer wall of the lead-out pipe. A push-up block is fitted on the inner wall of the inwardly retracted block. A cross plate is integrally formed above the inwardly retracted block on the lead-out pipe. A pressure column is arranged between the bottom surface of the cross plate and the top surface of the push-up block.

[0010] Further improvements are as follows: A sealing pressure pipe made of silica gel is also arranged at the top end of the lead-out pipe. A cover plate is fitted on the upper end of the sealing pressure pipe. A pulling elastic sheet is arranged between the bottom surface of the cover plate and the top surface of the cross plate.

[0011] Further improvements are as follows: A limiting boss fixedly connected to the top end of the lead-out pipe is arranged at the bottom end of the sealing pressure pipe.

[0012] Further improvements are as follows: The anti-corrosion device includes two fixing blocks fixedly arranged in the inner cavity of the water outlet end of the valve body and a rotating rod movably clamped between the two fixing blocks. A sliding groove is integrally formed on the rotating rod. An inner cavity cleaning frame is sleeved and slidably arranged on the inner wall of the sliding groove. The inner cavity cleaning frame includes a sliding sleeve sleeved and slidably arranged on the inner wall of the sliding groove and a bottom block arranged on the outer wall of the sliding sleeve. A first magnetic block capable of magnetic connection with a magnetic block is embedded in the bottom block. A hydraulic block is arranged on the top surface of the bottom block. A cleaning block is connected to the top of the hydraulic block. The hydraulic block includes a triangular block and an arc-shaped slope integrally formed on the outer surface of the triangular block. An inclined water guide hole penetrating the triangular block is integrally formed on the arc-shaped slope. A blocking slope block is fixedly arranged at the edge position of one end of the arc-shaped slope where the water guide hole is located. An arc-shaped opening and closing plate protruding outward is movably clamped at the other end of the water guide hole.

[0013] Further improvements are as follows: The cleaning block includes a platform arranged on the top of the hydraulic block and a tray slidably arranged on the inner wall of the top of the platform. A silica gel column is arranged between the bottom surface of the tray and the inner wall of the platform. A plurality of curved steel brushes are arranged on the top surface of the tray.

[0014] Further improvements are as follows: The magnetic block includes a sliding block body slidably disposed on the outer wall of the valve body and a buffer groove integrally formed inside the sliding block body. A second magnetic block is slidably disposed on the inner wall of the buffer groove. Buffer elastic pieces are provided between both sides of the second magnetic block and the side surfaces of the inner wall of the buffer groove. A pull handle is provided on the top of the sliding block body, and a roller is movably engaged with the bottom surface of the sliding block body.

[0015] After adopting the above technical solutions, the beneficial effects of the present invention are as follows: When the present invention is in use, if the valve body and the pressure-stabilizing outlet pipe are burned by high temperature, at this time, the water flow in the pipe body of the pressure-stabilizing outlet pipe will evaporate, thereby increasing the pressure. At this time, high-pressure water vapor can be introduced into the constant-pressure valve, and the push block can be pushed upward by the pressure of the water vapor, so that the push block no longer closes the inner cavity of the inward-receiving block, and then the water vapor with excessive pressure can be discharged outward, preventing the pressure in the water pipe connected to the alarm valve from increasing due to excessive pressure and avoiding abnormal triggering of the fire sprinkler.

[0016] When the present invention is in use, the inner cavity cleaning frame of the anti-corrosion device can be driven to rotate by the flowing water flow, and then the inner cavity of the valve body can be scraped by the steel brush of the cleaning block at the top of the rotating inner cavity cleaning frame, so as to scrape off the corrosive chemical substance adhesion layer mixed into the water flow, so that it flows away with the water flow and will not adhere to the inner cavity of the valve body for a long time, improving the overall corrosion resistance of the alarm valve and significantly increasing the service life of the alarm valve.

[0017] When the present invention is in use and after use, the magnetic block can be pulled at the same time. The first magnetic block is attracted by the magnetic force of the second magnetic block. Therefore, when the magnetic block is pulled, the inner cavity cleaning frame is pulled along the inner wall of the sliding groove by the magnetic force, so that the cleaning area of the inner cavity cleaning frame is greatly expanded, further improving the cleaning effect on the corrosive attachments in the inner cavity of the valve body, further improving the corrosion resistance and the service life of the valve body. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a schematic structural diagram of the front cross-section of the alarm valve of the present invention; Figure 2 It is a schematic structural diagram of the front cross-section of the pressure-stabilizing outlet pipe of the present invention; Figure 3 It is a schematic structural diagram of the front cross-section of the constant-pressure valve of the present invention; Figure 4 is a schematic structural diagram of the front view cross-section of the anti-corrosion device of the present invention; Figure 5 is a schematic structural diagram of the front view cross-section of the inner cavity cleaning rack of the present invention; Figure 6 is a schematic three-dimensional structural diagram of the hydraulic block of the present invention; Figure 7 is a schematic structural diagram of the top view cross-section of the hydraulic block at the water guide hole position of the present invention; Figure 8 is a schematic structural diagram of the front view cross-section of the cleaning block of the present invention; Figure 9 is a schematic structural diagram of the front view cross-section of the magnetic block of the present invention. Detailed implementation manners

[0020] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0021] Refer to Figures 1-9As shown in the figure, the technical solution adopted in this specific embodiment is as follows: An anti-corrosion alarm valve for chemical industry use, including a valve body 1 and a blocking block 2 arranged in the inner cavity of the valve body 1. A signal valve cover 3 is provided on the top of the valve body 1. A lifting valve core 5 with the bottom fitting the inner wall of the blocking block 2 is slidably arranged in the signal valve cover 3. A pressure spring 4 is provided at the top end of the lifting valve core 5. A pressure-stabilized water outlet pipe 7 is connected to the water outlet end of the valve body 1. The pressure-stabilized water outlet pipe 7 includes a pipe body 71 and a constant-pressure valve 75 penetrating and arranged on the outer wall of the pipe body 71. The constant-pressure valve 75 includes a lead-out pipe 21 penetrating and arranged on the outer wall of the pipe body 71 and an inwardly converging block 22 integrally formed at the bottom of the outer wall of the lead-out pipe 21. A push-up block 23 is fitted to the inner wall of the inwardly converging block 22. A cross plate 25 is integrally formed above the inwardly converging block 22 on the lead-out pipe 21. A pressure column 24 is arranged between the bottom surface of the cross plate 25 and the top surface of the push-up block 23. An anti-corrosion device 6 is arranged in the inner cavity of the water outlet end of the valve body 1. The anti-corrosion device 6 includes two fixed blocks 63 fixedly arranged in the inner cavity of the water outlet end of the valve body 1 and a rotating rod 61 movably clamped between the two fixed blocks 63. A sliding groove 64 is integrally formed on the rotating rod 61. An inner cavity cleaning frame 65 is sleeved and slidably arranged on the inner wall of the sliding groove 64. The inner cavity cleaning frame 65 includes a sliding sleeve 651 sleeved and slidably arranged on the inner wall of the sliding groove 64 and a bottom block 652 arranged on the outer wall of the sliding sleeve 651. A first magnetic block 653 capable of magnetic connection with a magnetic block 8 is embedded in the bottom block 652. A hydraulic block 654 is arranged on the top surface of the bottom block 652. A cleaning block 655 is connected to the top of the hydraulic block 654. The cleaning block 655 includes a support platform 41 arranged on the top of the hydraulic block 654 and a support plate 42 slidably arranged on the inner wall of the top of the support platform 41. A silica gel column 43 is arranged between the bottom surface of the support plate 42 and the inner wall of the support platform 41. A plurality of curved steel brushes 44 are arranged on the top surface of the support plate 42. The hydraulic block 654 includes a triangular block 31 and an arc-shaped slope 32 integrally formed on the outer surface of the triangular block 31. An inclined water guide hole 34 penetrating the triangular block 31 is integrally formed on the arc-shaped slope 32. A blocking slope block 33 is fixedly arranged at the edge position of one end of the arc-shaped slope 32 where the water guide hole 34 is located. An arc-shaped opening and closing plate 35 protruding outward is movably clamped at the other end of the water guide hole 34. A magnetic block 8 is slidably arranged on the outer wall of the water outlet end of the valve body 1 and is magnetically connected to the anti-corrosion device 6. The magnetic block 8 includes a sliding block body 81 slidably arranged on the outer wall of the valve body 1 and a buffer groove 84 integrally formed in the sliding block body 81. A second magnetic block 83 is slidably arranged on the inner wall of the buffer groove 84. Buffer elastic pieces 85 are arranged between the two sides of the second magnetic block 83 and the side surfaces of the inner wall of the buffer groove 84. A pull handle 82 is arranged on the top of the sliding block body 81. A roller 86 is movably clamped on the bottom surface of the sliding block body 81. When in use, one end of the valve body 1 is connected to the water inlet pipe, and the other end of the water outlet pipe with a fire sprinkler is connected to the pressure-stabilized water outlet pipe 7 on one side of the valve body 1. When a fire occurs and the fire sprinkler is triggered,At this time, the water in the outlet pipe will be ejected, which will cause a pressure difference between the inlet end and the outlet end of the valve body 1. Then, the water pressure is used to push up the lifting valve core 5, so that the water flow passes through the valve body 1 and is continuously output to the outlet pipe and the fire sprinkler. When in use, if the valve body 1 and the pressure-stabilized outlet pipe 7 are burned by high temperature, at this time, the water flow in the pipe body 71 of the pressure-stabilized outlet pipe 7 will evaporate, which will increase the pressure. At this time, the high-pressure water vapor can be introduced into the constant-pressure valve 75, and the upper push block 23 of the constant-pressure valve 75 is pushed up by the pressure of the water vapor, and the pressure column 24 is squeezed to shrink. The pressure column 24 requires a certain pressure to generate shrinkage deformation, so as to ensure that it will not be squeezed and deformed during normal use and cause water leakage. Thus, the upper push block 23 no longer closes the inner cavity of the inner receiving block 22, so that the water vapor with excessive pressure can be discharged outwards along the pipe body 71, preventing the pressure in the water pipe connected to the alarm valve from increasing due to excessive pressure and avoiding abnormal triggering of the fire sprinkler; At the same time, when in use, if a fire triggers the fire sprinkler and the valve is opened, at this time, the impact force can be output through the flowing water flow and output to the inner cavity cleaning frame 65 of the anti-corrosion device 6. At this time, the water flow can impact on the hydraulic block 654 of the inner cavity cleaning frame 65, causing it to impact the arc slope 32, generating a lateral force and applying it to the hydraulic block 654. At the same time, when part of the water flow impacts the arc slope 32, it will also be blocked by the blocking slope block 33 and introduced into the water guide hole 34, so that it enters the inclined water guide hole 34 and generates an additional rotational thrust, cooperating with the opening and closing plate 35 to prevent the water flow from flowing back from the other end of the water guide hole 34 and affecting the generation of the rotational thrust. At this time, the rotational force can be generated through the hydraulic block 654, so that the sliding sleeve 651 of the inner cavity cleaning frame 65 rotates together with the rotating rod 61, so that the cleaning block 655 provided at the top of the hydraulic block 654 fits on the inner wall of the valve body 1 and rotates and scrapes. At the same time, when scraping with the steel brush 44 on the cleaning block 655, when the support table 41 receives a high downward pressure, it can sink and squeeze the silica gel column 43, thereby preventing the steel brush 44 from generating too much extrusion force on the inner cavity of the valve body 1 and preventing excessive scraping and causing wear of the inner cavity of the valve body 1. At this time, the adhesion layer formed by the corrosive chemical substances mixed into the water flow on the inner wall of the valve body 1 can be scraped off, so that it flows away with the water flow and will not adhere to the inner cavity of the valve body 1 for a long time, improving the overall corrosion resistance of the alarm valve and significantly increasing the service life of the alarm valve; During use and after use, the magnetic block 8 can be conveniently and labor-savingly pulled by the pull handle 82. The first magnetic block 653 located on the inner cavity cleaning frame 65 is attracted by the magnetic force of the second magnetic block 83. Thus, when the magnetic block 8 is pulled, the first magnetic block 653 of the inner cavity cleaning frame 65 is simultaneously pulled by the magnetic force, so that the whole inner cavity cleaning frame 65 slides along the inner wall of the sliding groove 64. At the same time, during the pulling, the buffer groove 84 and the buffer elastic piece 85 cooperate to resist the inertial influence of the second magnetic block 85 during pulling, making the pulling smoother and easier. At this time, by pulling the magnetic block 8, the cleaning area of the inner cavity cleaning frame 65 is greatly expanded, further improving the cleaning effect on the corrosive attachments in the inner cavity of the valve body 1, further improving the corrosion resistance and the service life of the valve body 1.

[0022] The inner wall of the pipe body 71 is provided with a heat insulation coating 72, and a vacuum interlayer 74 is also provided inside the pipe body 71, which is beneficial to reducing the heat conduction efficiency of the pipe body 71, thereby reducing the heat received by the water inside the pipe body 71 and reducing the pressure inside the cavity of the pipe body 71 when it is roasted. The end of the pipe body 71 is provided with a connecting flange 73, which is beneficial to making the connection between the connecting flange 73 and the water outlet pipe simpler and faster. The top of the outlet pipe 21 is also provided with a sealing pressure pipe 27 made of silica gel. The upper end of the sealing pressure pipe 27 is attached with a cover plate 28. A pulling-back elastic piece 29 is provided between the bottom surface of the cover plate 28 and the top surface of the cross plate 25. When steam moves upward, if the steam pressure is small, it can only pass through the inward-receiving block 22. When continuing to move upward, sufficient pressure is required to resist the elastic force of the pulling-back elastic piece 29 to push open the cover plate 28 before the steam can be output outward. In the case of only water flow pressure fluctuations without steam generation, abnormal outward leakage of water can be avoided, further preventing water leakage during use. The bottom end of the sealing pressure pipe 27 is provided with a limiting boss 26 fixedly connected to the top end of the outlet pipe 21, which is beneficial to preventing the cover plate 28 from being pressed down excessively and causing the sealing pressure pipe 27 to be distorted, deformed and damaged.

[0023] Working principle of the present invention: During use, one end of the valve body 1 is connected to the water inlet pipe, and the other end of the water outlet pipe with a fire sprinkler is connected to the pressure-stabilizing water outlet pipe 7 on one side of the valve body 1. When a fire occurs and the fire sprinkler is triggered, the water in the water outlet pipe will be sprayed out at this time, which will cause a pressure difference between the water inlet end and the water outlet end of the valve body 1. Then, the lifting valve core 5 is pushed upward by the water pressure, so that the water flows through the valve body 1 and is continuously output to the water outlet pipe and the fire sprinkler. During use, if the valve body 1 and the pressure-stabilizing water outlet pipe 7 are burned by high temperature, at this time, the water flow in the pipe body 71 of the pressure-stabilizing water outlet pipe 7 will evaporate, which will increase the pressure. At this time, the high-pressure water vapor can be introduced into the constant-pressure valve 75, and the upper push block 23 of the constant-pressure valve 75 is pushed upward by the pressure of the water vapor, and the pressure column 24 is squeezed to make it contract. The pressure column 24 needs a certain pressure to generate contraction deformation, so as to ensure that it will not be deformed by upward extrusion and cause water leakage during normal use. Thus, the upper push block 23 no longer closes the inner cavity of the inner receiving block 22, and the water vapor with excessive pressure can be discharged outwards along the pipe body 71, preventing the pressure in the water pipe connected to the alarm valve from increasing due to excessive pressure and avoiding abnormal triggering of the fire sprinkler; At the same time, during use, if the fire triggers the fire sprinkler and the valve is opened, at this time, the impact force can be output through the flowing water, and the impact force is output to the inner cavity cleaning frame 65 of the anti-corrosion device 6. At this time, the water flow can impact on the hydraulic block 654 of the inner cavity cleaning frame 65, so that it impacts the arc slope 32, generates a lateral force, and applies it to the hydraulic block 654. At the same time, when part of the water flow impacts the arc slope 32, it will be blocked by the blocking slope block 33 and introduced into the water guide hole 34, and it will enter the inclined water guide hole 34 and generate an additional rotational thrust, which cooperates with the opening and closing plate 35 to prevent the water flow from flowing back from the other end of the water guide hole 34 and affecting the generation of the rotational thrust. At this time, the rotational force can be generated through the hydraulic block 654, so that the sliding sleeve 651 of the inner cavity cleaning frame 65 rotates together with the rotating rod 61. Thus, the cleaning block 655 provided at the top of the hydraulic block 654 fits on the inner wall of the valve body 1 for rotational scraping. At the same time, when scraping with the steel brush 44 on the cleaning block 655, when the support table 41 receives a high downward pressure, it can sink and squeeze the silica gel column 43, thereby preventing the steel brush 44 from generating too much extrusion pressure on the inner cavity of the valve body 1 and preventing excessive scraping and wear of the inner cavity of the valve body 1. At this time, the adhesion layer formed by the corrosive chemical substances mixed into the water flow on the inner wall of the valve body 1 can be scraped off, so that it flows away with the water flow and will not adhere to the inner cavity of the valve body 1 for a long time, improving the overall corrosion resistance of the alarm valve and significantly increasing the service life of the alarm valve; During use and after use, the magnetic block 8 can be conveniently and labor-savingly pulled through the pull handle 82. The first magnetic block 653 located on the inner cavity cleaning frame 65 is attracted by the magnetic force of the second magnetic block 83. Thus, when the magnetic block 8 is pulled, the first magnetic block 653 of the inner cavity cleaning frame 65 is simultaneously pulled by the magnetic force, causing the entire inner cavity cleaning frame 65 to slide along the inner wall of the sliding groove 64. At the same time, during the pulling process, the buffer groove 84 and the buffer elastic piece 85 cooperate to resist the inertial influence of the second magnetic block 85 during pulling, making the pulling smoother and easier. At this time, by pulling the magnetic block 8, the cleaning area of the inner cavity cleaning frame 65 is greatly expanded, further improving the cleaning effect of the corrosive attachments in the inner cavity of the valve body 1, further enhancing the corrosion resistance and the service life of the valve body 1.

[0024] What the present invention aims to protect is the structure of the product. The models of each component are not the content protected by the present invention and are also well-known technologies. Any component that can achieve the above functions of the present invention on the market can be selected and applied. Therefore, parameters such as the model of the component are not described in detail in the present invention. The contribution of the present invention lies in the scientific combination of each component.

[0025] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and explanations only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents. Where the present invention is not described in detail, it is all well-known technology to those skilled in the art.

Claims

1. A corrosion-resistant alarm valve for chemical industry, comprising a valve body (1) and a blocking block (2) arranged in the inner cavity of the valve body (1), a signal valve cover (3) being arranged on the top of the valve body (1), a lifting valve core (5) being slidably arranged in the signal valve cover (3) with the bottom thereof abutting against the inner wall of the blocking block (2), a pressure spring (4) being arranged on the top of the lifting valve core (5), characterized in that: A pressure-stabilizing water outlet pipe (7) is connected to the water outlet end of the valve body (1); an anti-corrosion device (6) is provided in the inner cavity of the water outlet end of the valve body (1); and a magnetic block (8) connected to the anti-corrosion device (6) by magnetic means is slidably provided on the outer wall of the water outlet end of the valve body (1).

2. The anti-corrosion alarm valve for chemical industry according to claim 1, characterized in that: The pressure-stabilized water outlet pipe (7) comprises a pipe body (71) and a constant pressure valve (75) penetrating the outer wall of the pipe body (71).

3. The anti-corrosion alarm valve for chemical industry according to claim 2, characterized in that: The inner wall of the tube body (71) is provided with a heat insulation coating (72), and a vacuum interlayer (74) is also provided inside the tube body (71).

4. The anti-corrosion alarm valve for chemical industry according to claim 2, characterized in that: A connecting flange (73) is provided at the end of the tube body (71).

5. The anti-corrosion alarm valve for chemical industry according to claim 2, characterized in that: The constant pressure valve (75) comprises an outlet pipe (21) penetrating the outer wall of the pipe body (71) and an inner retracted block (22) integrally formed at the bottom of the outer wall of the outlet pipe (21); an upper push block (23) is fitted on the inner wall of the inner retracted block (22); a transverse plate (25) is integrally formed above the outlet pipe (21) and a pressure column (24) is provided between the bottom surface of the transverse plate (25) and the top surface of the upper push block (23).

6. The anti-corrosion alarm valve for chemical industry according to claim 5, characterized in that: A sealing pressure tube (27) made of silicone material is also provided at the top end of the outlet tube (21), a cover plate (28) is attached to the upper end of the sealing pressure tube (27), and a pull-back elastic sheet (29) is provided between the bottom surface of the cover plate (28) and the top surface of the horizontal plate (25).

7. The anti-corrosion alarm valve for chemical industry according to claim 6, characterized in that: The bottom end of the sealing pressure tube (27) is provided with a limiting boss (26) fixedly connected to the top end of the outlet tube (21).

8. The anti-corrosion alarm valve for chemical industry according to claim 1, characterized in that: The anti-corrosion device (6) comprises two fixed blocks (63) fixedly arranged in the inner cavity of the water outlet end of the valve body (1) and a rotating rod (61) movably engaged between the two fixed blocks (63); a sliding groove (64) is integrally formed on the rotating rod (61); an inner cavity cleaning frame (65) is sleeved and slidably arranged on the inner wall of the sliding groove (64); the inner cavity cleaning frame (65) comprises a sliding sleeve (651) sleeved and slidably arranged on the inner wall of the sliding groove (64) and a bottom block (652) arranged on the outer wall of the sliding sleeve (651); a first magnetic block (652) is embedded in the bottom block (652) and can be connected to the magnetic block (8) by magnetic force. A magnetic block (653), a hydraulic block (654) is provided on the top surface of the bottom block (652), a cleaning block (655) is connected to the top of the hydraulic block (654), the hydraulic block (654) comprises a triangular block (31) and an arc slope (32) integrally formed on the outer surface of the triangular block (31), an inclined water guide hole (34) penetrating the triangular block (31) is integrally formed on the arc slope (32), a blocking slope block (33) is fixedly provided on the edge position of one end of the water guide hole (34), and an outwardly protruding arc opening and closing plate (35) is movably engaged on the other end of the water guide hole (34).

9. The anti-corrosion alarm valve for chemical industry according to claim 8, characterized in that: The cleaning block (655) comprises a support platform (41) arranged on the top of the hydraulic block (654) and a support plate (42) slidably arranged on the inner wall of the top of the support platform (41), a silicone column (43) is arranged between the bottom surface of the support plate (42) and the inner wall of the support platform (41), and a plurality of curved steel brushes (44) are arranged on the top surface of the support plate (42).

10. The anti-corrosion alarm valve for chemical industry according to claim 1, characterized in that: The magnetic block (8) comprises a sliding block body (81) slidably arranged on the outer wall of the valve body (1) and a buffer groove (84) integrally formed in the sliding block body (81); a second magnetic block (83) is slidably arranged on the inner wall of the buffer groove (84); buffer spring sheets (85) are arranged between the two sides of the second magnetic block (83) and the inner wall side of the buffer groove (84); a handle (82) is arranged on the top of the sliding block body (81); and a roller (86) is movably engaged with the bottom surface of the sliding block body (81).

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