Gas pressure regulator with built-in silencer

Abstract

This invention relates to the field of gas transmission noise reduction technology, specifically a built-in noise reduction device for a gas pressure regulator with valve seat protection. The device includes a valve body and a valve seat and valve plug installed inside the valve body. The valve seat is provided with a sealing nitrile rubber for sealing. It also includes: a cylindrical noise reduction hood installed inside the valve body and fixed to the upper part of the valve seat by a bracket, with the valve plug located inside the hood; a multi-stage pressure-reducing noise reduction module disposed on the side wall of the hood, the module consisting of multiple layers of noise-reducing holes arranged sequentially along the airflow direction, used to progressively reduce airflow velocity and pressure and disrupt the noise spectrum; and a protective structure for protecting the valve seat sealing surface, disposed inside the hood and below the multi-stage pressure-reducing noise reduction module. This built-in noise reduction device for a gas pressure regulator with valve seat protection integrates noise reduction and valve seat protection, significantly extending the valve seat life.

Description

Technical Field

[0001] This invention relates to the field of gas transmission silencing technology, specifically to a built-in silencing device for a gas pressure regulator with valve seat protection function. Background Technology

[0002] Gas pressure regulators are core equipment in gas transmission and distribution systems, functioning to stably reduce the higher upstream inlet pressure to the lower downstream pressure required. During the pressure reduction process, the high-speed flowing gas generates strong eddies and vibrations, resulting in significant aerodynamic noise. This noise not only causes environmental pollution, affecting the lives and work of people near the equipment, but long-term noise and vibration can also lead to fatigue damage to the internal components of the pressure regulator.

[0003] More seriously, under high pressure differential conditions, the gas flows at extremely high velocities through the valve port, creating cavitation and scouring effects near the valve seat sealing surface. Cavitation generates tiny bubbles that, upon collapse, produce a tremendous instantaneous impact force on the valve seat surface; scouring occurs through the continuous wear of the valve seat surface by the high-speed fluid and its potentially carried microparticles. The combined effect of these two factors severely erodes and damages the valve seat sealing surface, leading to internal leakage in the regulator, decreased pressure regulation accuracy, shortened service life, and even safety accidents. Therefore, we propose a gas regulator with a built-in silencer and valve seat protection function. Summary of the Invention

[0004] The purpose of this invention is to provide a built-in silencing device for a gas pressure regulator with valve seat protection function, thereby solving the problems mentioned in the background art. To achieve the above objective, this invention provides the following technical solution: a built-in silencing device for a gas pressure regulator with valve seat protection function, comprising a valve body and a valve seat and a valve plug installed inside the valve body, wherein the valve seat is provided with a sealing nitrile rubber for sealing, and further comprising: The silencer cover has a cylindrical structure. It is installed inside the valve body and fixed to the upper part of the valve seat by a bracket. The valve plug is located inside the silencer cover. The multi-stage pressure reduction and noise reduction module is installed on the side wall of the noise reduction cover. The multi-stage pressure reduction and noise reduction module consists of a multi-layer noise reduction hole array arranged sequentially along the airflow direction. It is used to gradually reduce the airflow speed and pressure and destroy the noise spectrum. A protective structure for protecting the valve seat sealing surface is located inside the silencer cover and below the multi-stage pressure reduction silencer module.

[0005] Preferably, the silencing hole array has ten layers, arranged sequentially from bottom to top on the silencing cover. The silencing hole array consists of multiple small holes formed on the peripheral wall of the silencing cover, and the multiple small holes are equally spaced along the peripheral wall of the silencing cover. The small holes on adjacent layers of the silencing cover are staggered sequentially, so that the airflow forms disturbance and energy dissipation between layers. In the multi-stage pressure reduction silencing module, the opening rate of each layer of the silencing hole array increases progressively along the airflow direction. The opening rate of the first-stage silencing hole array is 10%~25%, the opening rate of the last-stage silencing hole array is 50%~70%, and the opening rates of the intermediate stages are arranged in an arithmetic progression.

[0006] Preferably, the protective structure includes an integrally fixed flow guide skirt on the inner wall of the muffler body. The flow guide skirt has a concentric annular structure with the muffler body and covers the outer side of the metal sealing surface of the valve seat to form an annular protective barrier. The bottom surface of the flow guide skirt has a concentrically arranged annular groove, and both sides of the groove have a chamfered structure. The bottom surface of the flow guide skirt is pressed against the upper surface of the sealing nitrile rubber.

[0007] Preferably, the upper part of the guide skirt near the inner edge is provided with a guide surface that is inclined upward along the airflow direction, and the inner edge of the guide skirt and the lower end of the guide surface are provided with a rounded corner structure.

[0008] Preferably, the valve body has an opening at the bottom, which is sealed by a flange, and the flange is equipped with an antifreeze system for protecting the valve seat from low temperatures.

[0009] Preferably, the antifreeze system includes a pump wheel and a liquid storage tank fixed to the bottom of the flange, and the inlet end of the pump wheel is connected to the liquid storage tank through a water pipe. The liquid storage tank is equipped with a heating resistance wire inside, and an impeller is rotatably connected to the pump wheel on a fixed axis inside. The bottom of the pump wheel is fixed and connected to the column.

[0010] Preferably, the antifreeze system further includes a ring frame fixed to the flange by multiple support rods, the ring frame being located inside the valve body and fitted against the bottom surface of the valve seat, the center of the ring frame being rotatably connected to the first impeller via a bracket, a shaft being slidably connected through the flange, and the shaft rotating on the flange, the upper end of the shaft being coaxially fixedly connected to a multi-faceted rod, and the multi-faceted rod being slidably connected through the center of the first impeller, the upper end of the multi-faceted rod being fitted with a freely rotating ball, and the ball contacting the inner push rod of the valve plug, the lower end of the shaft passing through the upper end wall of the pump wheel and the center of the second impeller and extending into the cylinder, the shaft rotating on the upper end wall of the pump wheel and the second impeller.

[0011] Preferably, a sliding rod is slidably connected through the lower end wall of the column, and a disc is fixed at the upper end of the sliding rod. The bottom surface of the disc is connected to the lower end wall of the column through a spring, and the upper surface of the disc is rotatably connected to a gear disc one through a turntable bearing. The gear disc is coaxially fixed to the lower end of the shaft. The bottom surface of the impeller two is coaxially fixedly connected to a gear disc two that matches the gear disc one. A connecting rod is fixed at the lower end of the sliding rod, and a contact rod and a push-pull rod are fixedly fixed at both ends of the connecting rod, respectively. A sliding cylinder and a pump cylinder are fixed at the bottom surface of the pump wheel. A touch switch is provided inside the sliding cylinder, and the sliding rod is slidably inserted into the sliding cylinder and engages with the touch switch. A piston plate is slidably connected inside the pump cylinder, and the push-pull rod is fixedly connected to the piston plate.

[0012] Preferably, the valve seat has an annular channel, and the bottom surface of the valve seat has two holes that communicate with the annular channel. The lower ends of the two holes are fixedly connected to the insertion tubes, and the axial section of the insertion tubes is T-shaped. The ring frame has two stepped holes that are adapted to the two insertion tubes.

[0013] Preferably, two conduits pass through the flange, and the two conduits are fixed and connected to the lower ends of two stepped holes respectively. The lower end of one conduit is connected to the outlet end of the pump wheel through water pipe one, and the lower end of the other conduit is connected to the storage tank through water pipe three. A one-way valve is connected to water pipe three, and the conduction direction of the one-way valve is towards the storage tank. The pump cylinder is connected to water pipe three on the inlet side of the one-way valve through water pipe four, and a solenoid valve is connected to water pipe four.

[0014] Compared with the prior art, the gas pressure regulator with valve seat protection function provided by the present invention has the following beneficial effects: 1. Integrated noise reduction and valve seat protection By integrating the silencer cover, multi-stage pressure reduction and silencing module (ten layers of staggered arrangement with progressively increasing opening ratio of the silencing hole array) and flow guide skirt into the valve body, the energy that generates noise and cavitation is reduced from the source, realizing the integration of silencing and valve seat protection functions. The structure is compact and does not occupy additional pipeline space.

[0015] 2. Significantly extends valve seat life Multi-stage pressure reduction: The ten-layer silencing array with progressively increasing open area decomposes a large pressure drop into multiple smaller pressure drops, fundamentally avoiding extreme high speeds and strong cavitation effects at the valve port. Rectification and flow equalization: Eliminates radial and tangential velocity components, making the airflow uniform and stable, avoiding turbulent scouring of downstream pipes and the back of valve seats; Physical barrier: The flow guide skirt covers the outer side of the valve seat metal sealing surface, forming a ring-shaped protective barrier, which effectively blocks the high-speed core flow from directly impacting the sealing surface.

[0016] 3. Antifreeze protection function An antifreeze system is installed on the flange, which uses airflow to drive the heated liquid to circulate through the annular channel inside the valve seat. This effectively prevents the valve seat from becoming locally cold or even freezing due to airflow expansion under high pressure differential conditions, thus avoiding secondary damage to the sealing surface caused by low temperature or freezing.

[0017] 4. Automatic start / stop and anti-expansion protection When the valve plug opens, the antifreeze system automatically starts heating and circulation; When the valve plug is closed, the antifreeze system automatically shuts off and stops. At the same time, a low-pressure expansion space is formed in the pipeline through the pump cylinder and piston plate structure to prevent residual liquid from damaging the valve seat due to expansion caused by temperature recovery.

[0018] 5. Particle blocking and protection The impeller rotates under the action of airflow, which can increase the blocking effect on particles carried by the airflow, reduce their potential energy, and provide additional protection for the valve seat and downstream pipeline.

[0019] 6. Compact structure, easy to assemble and disassemble The silencer cover is integrated inside the valve body. The antifreeze system is connected to the bottom opening of the valve body via a flange. During installation, the ring bracket is inserted from the bottom, the insert pipe is aligned with the stepped hole, and the flange is fixed. During on-site maintenance, there is no need to disassemble the entire pressure regulator, making disassembly and assembly very convenient. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall assembly cross-section of the present invention; Figure 2 for Figure 1 Enlarged structural diagram at point A in the diagram; Figure 3 for Figure 2 Enlarged structural diagram at point B in the diagram; Figure 4 This is a bottom view of the ring frame structure in this invention; Figure 5 for Figure 1 Enlarged structural diagram at point C; Figure 6 for Figure 5 A magnified structural diagram at point D in the diagram.

[0021] In the diagram: 1. Valve body; 2. Valve seat; 3. Valve plug; 4. Silencing cover; 5. Flange; 6. Anti-freeze system; 7. Ring frame; 8. Impeller 1; 9. Multi-faceted rod; 10. Shaft; 11. Support rod; 12. Guide tube; 13. Guide skirt; 14. Silencing hole array; 15. Sealing nitrile rubber; 16. Annular channel; 17. Ball bearing; 18. Support; 19. Groove; 20. Chamfered structure; 21. Guide surface; 22. Rounded corner structure; 23. Channel; 24. Insert tube; 25. 26. Stepped hole; 27. Pump impeller; 28. Impeller II; 29. ​​Column cylinder; 30. Water pipe I; 31. Gear disc I; 32. Water pipe II; 33. Water pipe III; 34. Check valve; 35. Liquid storage tank; 36. Heating resistance wire; 37. Slide rod; 38. Connecting rod; 39. Pump cylinder; 40. Contact rod; 41. Slide cylinder; 42. Touch switch; 43. Push-pull rod; 44. Piston plate; 45. Water pipe IV; 46. Solenoid valve; 47. Disc; 48. Spring; 49. Gear disc II; 40. Support frame. Detailed Implementation

[0022] 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 skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Please see Figures 1 to 6 The present invention provides a technical solution: a gas pressure regulator with built-in silencing device for valve seat protection, comprising a valve body 1 and a valve seat 2 and a valve plug 3 installed inside the valve body 1, wherein the valve seat 2 is provided with a sealing nitrile rubber 15 for sealing, and further comprising: The silencer cover 4 has a straight cylindrical structure. The silencer cover 4 is installed inside the valve body 1 and fixed to the upper part of the valve seat 2 by the support 49, and the valve plug 3 is located inside the silencer cover 4. The multi-stage pressure reduction and noise reduction module is installed on the side wall of the noise reduction cover 4. The multi-stage pressure reduction and noise reduction module consists of a multi-layer noise reduction hole array 14 arranged sequentially along the airflow direction. It is used to gradually reduce the airflow speed and pressure and destroy the noise spectrum. The protective structure is used to protect the sealing surface of the valve seat 2. The protective structure is located inside the silencer cover 4 and below the multi-stage pressure reduction silencer module.

[0024] In this embodiment, the silencing hole array 14 has ten layers, arranged sequentially from bottom to top on the silencing cover 4. The silencing hole array 14 consists of multiple small holes formed on the peripheral wall of the silencing cover 4, and the multiple small holes are equally spaced along the peripheral wall of the silencing cover 4. The small holes on adjacent layers of the silencing cover 4 are staggered sequentially, so that the airflow forms disturbance and energy dissipation between layers. In the multi-stage pressure reduction silencing module, the opening rate of each layer of the silencing hole array 14 increases step by step along the airflow direction. The opening rate of the first-stage silencing hole array 14 is 10%~25%, the opening rate of the last-stage silencing hole array 14 is 50%~70%, and the opening rates of the intermediate stages are arranged in an arithmetic progression.

[0025] In this embodiment, the protective structure includes a flow guide skirt 13 integrally fixed to the inner wall of the muffler 4. The flow guide skirt 13 has a ring structure concentric with the muffler 4 and covers the outer side of the metal sealing surface of the valve seat 2 to form a ring-shaped protective barrier. The bottom surface of the flow guide skirt 13 has a concentrically arranged ring-shaped groove 19, and both sides of the groove 19 have chamfered structures 20. The bottom surface of the flow guide skirt 13 is pressed against the upper surface of the sealing nitrile rubber 15.

[0026] In this embodiment, the upper part of the guide skirt 13 near the inner edge is provided with a guide surface 21 that is inclined upward along the airflow direction, and the inner edge of the guide skirt 13 and the lower end of the guide surface 21 are provided with a rounded corner structure 22.

[0027] In this embodiment, the bottom of the valve body 1 is open and sealed by a flange 5, and the flange 5 is provided with an antifreeze system 6 for protecting the valve seat 2 from low temperatures.

[0028] In this embodiment, the antifreeze system 6 includes a pump wheel 26 fixed to the bottom surface of the flange 5 and a liquid storage tank 34. The inlet end of the pump wheel 26 is connected to the liquid storage tank 34 through a water pipe 31. A heating resistance wire 35 is provided inside the liquid storage tank 34. An impeller 27 is rotatably connected to the inside of the pump wheel 26. The bottom of the pump wheel 26 is fixed and connected to the column cylinder 28.

[0029] In this embodiment, the antifreeze system 6 also includes a ring frame 7 fixed to the flange 5 by multiple support rods 11. The ring frame 7 is located inside the valve body 1 and is fitted to the bottom surface of the valve seat 2. The center of the ring frame 7 is rotatably connected to the impeller 8 via a bracket 18. A shaft 10 is slidably connected through the flange 5 and rotates on the flange 5. The upper end of the shaft 10 is coaxially fixedly connected to a polygonal rod 9, which is slidably connected through the impeller 8. A freely rotating ball 17 is embedded in the upper end of the polygonal rod 9, and the ball 17 contacts the inner push rod of the valve plug 3. The lower end of the shaft 10 passes through the pump wheel 26. The upper end wall of the pump wheel 26 and the center of the impeller 27 extend into the cylinder 28. The shaft 10 rotates on the upper end wall of the pump wheel 26 and the impeller 27. A slide rod 36 is slidably connected through the lower end wall of the cylinder 28, and a disc 46 is fixed at the upper end of the slide rod 36. The bottom surface of the disc 46 is connected to the lower end wall of the cylinder 28 by a spring 47, and the upper surface of the disc 46 is rotatably connected to a gear disc 30 via a turntable bearing. The gear disc 30 is coaxially fixed at the lower end of the shaft 10. The bottom surface of the impeller 27 is coaxially fixedly connected to a gear disc 48 that matches the gear disc 30. A connecting rod 37 is fixed at the lower end of the slide rod 36. The two ends of the connecting rod 37 are respectively fixed to the contact rod 39 and the push-pull rod 42. The bottom surface of the pump wheel 26 is fixed with the slide cylinder 40 and the pump cylinder 38. The slide cylinder 40 is equipped with a touch switch 41, and the slide rod 36 is slidably inserted into the slide cylinder 40 and abuts against the touch switch 41. The piston plate 43 is slidably connected inside the pump cylinder 38, and the push-pull rod 42 is fixedly connected to the piston plate 43. The valve seat 2 has an annular channel 16, and the bottom surface of the valve seat 2 has two holes 23 that communicate with the annular channel 16. The lower ends of the two holes 23 are fixedly connected to the insertion tubes 24, and the axial section of the insertion tubes 24 is T-shaped. The ring frame 7 has openings for the two insertion tubes. Two stepped holes 25 are adapted for phase 24. Two conduits 12 pass through the flange 5, and the two conduits 12 are fixed and connected to the lower ends of the two stepped holes 25 respectively. The lower end of one conduit 12 is connected to the outlet end of the pump wheel 26 through water pipe 1 29, and the lower end of the other conduit 12 is connected to the liquid storage tank 34 through water pipe 32. A one-way valve 33 is connected to water pipe 32, and the conduction direction of the one-way valve 33 is pointing towards the liquid storage tank 34. The pump cylinder 38 is connected to water pipe 32 on the inlet side of the one-way valve 33 through water pipe 44, and a solenoid valve 45 is connected to water pipe 44. The solenoid valve 45 is normally open.

[0030] Working principle and advantages of this invention: The gas pressure regulator with valve seat protection and built-in silencer operates as follows: like Figure 1 , Figure 2 and Figure 3As shown, the silencer hood 4, the multi-stage pressure reduction silencer module and the protection structure are integrated into a whole and installed inside the valve body 1. It does not occupy additional pipeline space, has a compact structure, is easy to disassemble and assemble, and does not require disassembling the entire pressure regulator during on-site maintenance.

[0031] When the pressure regulator is working, the gas passes through the open valve seat 2, forming a high-speed jet. The silencer 4 is fixedly installed inside the valve body 1 with the valve seat 2 via the support 49. Its upstream opening faces the valve seat 2 to receive the entire mainstream gas flow. The high-speed gas first impacts the multi-stage pressure reduction and silencing module inside the silencer 4. This module consists of ten layers of silencing holes 14 with different opening ratios, which creates maximum throttling and initial expansion of the airflow. This process converts a violent release of pressure energy into multiple gentle energy dissipations, effectively suppressing the generation of cavitation and significantly reducing the impact of high-speed turbulence. The wideband noise reduction and multi-stage pressure reduction silencing module also eliminates radial and tangential velocity components, making the airflow uniform and stable. This smooth airflow then enters the downstream channel and hardly generates any new significant noise, thus avoiding scouring of the downstream pipe and the back of the valve seat 2. The guide skirt 13 on the silencing cover 4 acts like a "shield" around the sealing nitrile rubber 15 of the valve seat 2. It can effectively block the high-speed core jet ejected from the valve seat 2 that may spread in all directions from directly impacting the metal sealing surface of the valve seat 2, providing the most direct physical protection.

[0032] like Figures 1 to 6 As shown, when the pressure regulator is working, the valve plug 3 moves upward and opens. Under the action of the spring 47, the disc 46 moves upward and pushes the gear disc 30 to mesh with the gear disc 48. At the same time, the slide rod 36 drives the connecting rod 37 to move upward, so that the connecting rod 37 drives the contact rod 39 to contact the touch switch 41, thereby energizing the heating wire 35 to heat it up. The solenoid valve 45 is energized and closed. When the airflow flows through the valve port and enters the valve seat 2, it applies a force to the impeller 8, causing it to rotate. The impeller 8 can increase the blocking effect on the particles carried by the airflow, reduce their potential energy, and protect the valve seat 2 and downstream pipeline. The impeller 8 rotates under the action of the airflow and drives the gear disc 30 to rotate through the multi-faceted rod 9 and the shaft 10. The gear disc 30 drives the impeller 27 to rotate via the gear disc 48, which in turn draws the heated liquid from the storage tank 34 through the water pipe 31 and delivers it to the annular channel 16 via the water pipe 29 and its corresponding conduit 12. This avoids the possibility that the expansion of the airflow under high pressure differential conditions may cause the valve seat 2 to locally become cold or even freeze, and prevents the low temperature or freezing from causing secondary damage to the sealing surface. The liquid that has dissipated heat enters the water pipe 32 through another conduit 12 and flows back to the storage tank 34 for recirculation and heating.

[0033] When the pressure regulator is closed, the valve plug 3 moves down and drives the multi-faceted rod 9 and shaft 10 to move down through the ball bearing 17. This causes the shaft 10 to drive the gear disc 48 to move down, which in turn causes the disc 46 to drive the connecting rod 37 to move down through the slide rod 36. This causes the connecting rod 37 to simultaneously drive the contact rod 39 and the push-pull rod 42 to move down, so that the contact rod 39 moves away from the touch switch 41. At this time, the heating resistance wire 35 and the solenoid valve 45 are de-energized, the solenoid valve 45 opens, and the push-pull rod 42 moves down, causing the piston plate 43 to move down, so that a low-pressure expansion space is formed in the pump cylinder 38. This prevents the liquid in the annular channel 16 from expanding and damaging the valve seat 2 after the temperature is restored.

[0034] When disassembling the antifreeze system 6, simply remove the flange 5 from the valve body 1 and pull out the ring bracket 7 together. During installation, insert the ring bracket 7 into the valve body 1 from the bottom opening, and insert the insertion tube 24 into the corresponding stepped hole 25. Then, fix the flange 5 to the valve body 1 with screws. It is very convenient.

[0035] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0036] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

Claims

1. A gas pressure regulator with valve seat protection and antifreeze function, comprising a valve body (1) and a valve seat (2) and a valve plug (3) installed inside the valve body (1), wherein the valve seat (2) is provided with a sealing nitrile rubber (15) for sealing, characterized in that: Also includes: The silencer cover (4) has a straight cylindrical structure. The silencer cover (4) is installed inside the valve body (1) and fixed to the upper part of the valve seat (2) by the support frame (49). The valve plug (3) is located inside the silencer cover (4). The multi-stage pressure reduction and noise reduction module is set on the side wall of the noise reduction cover (4). The multi-stage pressure reduction and noise reduction module is composed of a multi-layer noise reduction hole array (14) arranged sequentially along the airflow direction. It is used to gradually reduce the airflow speed and pressure and destroy the noise spectrum. A protective structure for protecting the sealing surface of the valve seat (2) is provided inside the silencing cover (4) and located below the multi-stage pressure reduction silencing module. The bottom opening of the valve body (1) is sealed by a flange (5), and the flange (5) is provided with an antifreeze system (6) for low-temperature protection of the valve seat (2). The antifreeze system (6) includes a pump wheel (26) fixed on the bottom surface of the flange (5) and a liquid storage tank (34). The inlet end of the pump wheel (26) is connected to the liquid storage tank (34) through a water pipe (31). The liquid storage tank (34) is equipped with a heating resistance wire (35). The pump wheel (26) is rotatably connected to an impeller (27) on a fixed axis. The bottom of the pump wheel (26) is fixed and connected to a column cylinder (28). The antifreeze system (6) also includes a ring frame (7) fixed to the flange (5) by multiple support rods (11), and the ring frame (7) is located inside the valve body (1) and fitted to the bottom surface of the valve seat (2). The center of the ring frame (7) is rotatably connected to the impeller (8) via a bracket (18). A shaft (10) is slidably connected through the flange (5), and the shaft (10) rotates on the flange (5). The upper end of the shaft (10) is coaxially fixed to the flange. A multi-faceted rod (9) is connected and slidably connected to the center of impeller one (8). The upper end of the multi-faceted rod (9) is fitted with a freely rotating ball (17), and the ball (17) contacts the inner push rod of the valve plug (3). The lower end of the shaft (10) passes through the upper wall of the pump wheel (26) and the center of impeller two (27) and extends into the cylinder (28). The shaft (10) rotates on the upper wall of the pump wheel (26) and impeller two (27). A sliding rod (36) is slidably connected through the lower end wall of the column (28), and a disc (46) is fixed at the upper end of the sliding rod (36). The bottom surface of the disc (46) is connected to the lower end wall of the column (28) through a spring (47), and the upper surface of the disc (46) is rotatably connected to a gear disc (30) through a turntable bearing. The gear disc (30) is coaxially fixed at the lower end of the shaft (10). The bottom surface of the impeller (27) is coaxially fixedly connected to a gear disc (48) that matches the gear disc (30). A connecting rod (37) is fixed at the lower end of the slide rod (36), and the two ends of the connecting rod (37) are respectively fixed to the contact rod (39) and the push-pull rod (42). The bottom surface of the pump wheel (26) is fixed with a slide cylinder (40) and a pump cylinder (38). A touch switch (41) is provided inside the slide cylinder (40), and the slide rod (36) is slidably inserted into the slide cylinder (40) and abuts against the touch switch (41). A piston plate (43) is slidably connected inside the pump cylinder (38), and the push-pull rod (42) is fixedly connected to the piston plate (43). The valve seat (2) has an annular channel (16) inside, and the bottom surface of the valve seat (2) has two holes (23) that communicate with the annular channel (16). The lower ends of the two holes (23) are fixedly connected to the insertion tubes (24), and the axial section of the insertion tubes (24) is T-shaped. The ring frame (7) has two stepped holes (25) that are adapted to the two insertion tubes (24). Two conduits (12) pass through the flange (5), and the two conduits (12) are fixed and connected to the lower ends of two stepped holes (25) respectively. The lower end of one conduit (12) is connected to the outlet end of the pump wheel (26) through water pipe one (29), and the lower end of the other conduit (12) is connected to the storage tank (34) through water pipe three (32). A one-way valve (33) is connected to the water pipe three (32), and the conduction direction of the one-way valve (33) points to the storage tank (34). The pump cylinder (38) is connected to the water pipe three (32) on the inlet side of the one-way valve (33) through water pipe four (44), and a solenoid valve (45) is connected to the water pipe four (44). When the pressure regulator is working, the valve plug (3) moves upward and opens. Under the action of the spring (47), the disc (46) moves upward and pushes the first gear disc (30) to mesh with the second gear disc (48). At the same time, the slide rod (36) drives the connecting rod (37) to move upward, so that the connecting rod (37) drives the contact rod (39) to contact the touch switch (41), thereby energizing the heating wire (35) to heat up. The solenoid valve (45) is energized and closed. When the airflow flows through the valve port and enters the valve seat (2), it applies a force to the first impeller (8). The first impeller (8) is subjected to airflow. The flow rotates and drives the gear disk one (30) to rotate through the multi-faceted rod (9) and shaft (10), thereby causing the gear disk one (30) to drive the impeller two (27) to rotate through the gear disk two (48), and then the impeller two (27) draws the heated liquid from the storage tank (34) through the water pipe two (31), and transports it to the annular channel (16) through the water pipe one (29) and its corresponding conduit. After dissipating heat, the liquid enters the water pipe three (32) through another conduit and flows back to the storage tank (34) for circulating heating. When the pressure regulator is closed, the valve plug (3) moves down and drives the multi-faceted rod (9) and shaft (10) to move down through the ball (17), which in turn drives the gear plate (48) to move down. This causes the disc (46) to drive the connecting rod (37) to move down through the slide rod (36), which in turn drives the contact rod (39) and push-pull rod (42) to move down. This causes the contact rod (39) to move away from the touch switch (41). At this time, the heating resistance wire (35) and the solenoid valve (45) are de-energized, the solenoid valve (45) opens, and the push-pull rod (42) moves down, causing the piston plate (43) to move down. This creates a low-pressure expansion space inside the pump cylinder (38), preventing the liquid in the annular channel (16) from expanding and damaging the valve seat (2) after the temperature is restored.

2. A gas pressure regulator with valve seat protection and antifreeze function according to claim 1, characterized in that: The silencing hole array (14) has ten layers and is arranged sequentially from bottom to top on the silencing cover (4). The silencing hole array (14) consists of multiple small holes opened on the periphery of the silencing cover (4), and the multiple small holes are equally spaced along the periphery of the silencing cover (4). The small holes on adjacent layers of the silencing cover (4) are staggered sequentially, so that the airflow forms disturbance and energy dissipation between layers. In the multi-stage pressure reduction silencing module, the opening rate of each layer of the silencing hole array (14) increases step by step along the airflow direction. The opening rate of the first-stage silencing hole array (14) is 10%~25%, the opening rate of the last-stage silencing hole array (14) is 50%~70%, and the opening rates of the intermediate stages are arranged in an arithmetic progression.

3. A gas pressure regulator with valve seat protection and antifreeze function according to claim 1, characterized in that: The protective structure includes a flow guide skirt (13) integrally fixed on the inner wall of the muffler (4). The flow guide skirt (13) is a ring structure concentric with the muffler (4) and covers the outer side of the metal sealing surface of the valve seat (2) to form a ring protective barrier. The bottom surface of the flow guide skirt (13) is provided with a concentric ring-shaped groove (19), and both sides of the groove (19) are provided with a chamfer structure (20). The bottom surface of the flow guide skirt (13) is pressed against the upper surface of the sealing nitrile rubber (15).

4. A gas pressure regulator with valve seat protection and antifreeze function according to claim 3, characterized in that: The upper part of the guide skirt (13) near the inner edge is provided with a guide surface (21) that is inclined upward along the airflow direction, and the inner edge of the guide skirt (13) and the lower end of the guide surface (21) are provided with a rounded corner structure (22).

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