A pressure reducer for natural gas

Abstract

The application relates to the technical field of pressure reducing valves, and discloses a pressure reducer for natural gas, which comprises a valve body, a visual warning mechanism fixedly connected to the low-pressure end of the valve body, a locking mechanism arranged on the outer portion of the valve body, and sound warning mechanisms arranged on the upper and lower sides of the visual warning mechanism. The visual warning mechanism is used for issuing a visual alarm when the temperature is too high or too low, the locking mechanism is used for keeping the visual alarm state and needs to be manually released, and the sound warning mechanisms can issue sound alarms when the temperature is too high or too low and can be released along with the manual release of the locking mechanism. Through the linkage of the visual warning mechanism and the sound warning mechanisms, visual and sound warnings can be issued when the temperature of the pressure reducer is too high or too low, timely warnings can be issued before low-temperature ice blocking occurs and high-temperature tempering risks appear, operation and maintenance personnel can quickly dispose, and the safety hidden danger during the use of the natural gas pressure reducer is reduced.

Description

Technical Field

[0001] This invention relates to the field of pressure reducing valve technology, specifically a pressure reducing device for natural gas. Background Technology

[0002] Natural gas pressure regulators, also known as natural gas pressure reducing valves, are mostly straight-through flange structures, mainly composed of a valve body, inlet and outlet ports, adjusting spring, piston, valve core, and valve seat. High-pressure natural gas is throttled and depressurized through the valve port. The outlet pressure acts on the piston and balances with the spring force, automatically adjusting the opening to achieve stable pressure output. The equipment operates on a purely mechanical structure, requires no power supply, is explosion-proof and reliable, and is widely used in gas transmission and distribution systems.

[0003] Existing natural gas pressure regulators have pressure regulation functions but lack a purely mechanical pre-warning function for abnormal temperatures. Natural gas pressure regulators are prone to ice blockage at low temperatures and backfire at high temperatures. It is difficult for manual inspection to detect abnormal temperatures in the pressure regulator, thus posing a safety hazard. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a pressure regulator for natural gas, solving the problem that existing natural gas pressure regulators lack a purely mechanical pre-warning function for temperature anomalies, making it difficult for manual inspection to detect temperature anomalies and posing a safety hazard.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a pressure regulator for natural gas, comprising a valve body, wherein a visual warning mechanism is fixedly connected to the low-pressure end of the valve body, the visual warning mechanism being used to issue a visual alarm when the temperature is too high or too low, a locking mechanism being provided on the outside of the valve body, the locking mechanism being used to maintain the visual alarm state and requiring manual release, and audible warning mechanisms being provided on both the upper and lower sides of the visual warning mechanism, the audible warning mechanisms being able to issue an audible alarm when the temperature is too high or too low, and being released when the locking mechanism is manually released.

[0006] Preferably, the visual warning mechanism includes a cylinder, the outside of which is fixedly connected to the low-pressure end of the valve body, a compression spring is provided inside the cylinder, a movable plug is slidably connected inside the cylinder, a movable rod is fixedly connected to the middle of the movable plug, warning signs are respectively provided at both ends of the movable rod, a fixed sleeve is fixedly connected to the bottom of the low-pressure end of the valve body, a hollow cage is fixedly connected to the top of the cylinder and the bottom of the fixed sleeve, paraffin wax is provided in the space below the movable plug inside the cylinder, and multiple holes are opened at the top of the cylinder.

[0007] Preferably, the top of the movable plug is fixedly connected to multiple fixing tubes, the top of the fixing tubes is fixedly connected to a tension spring, the top of the tension spring is fixedly connected to a top frame, the middle of the top frame is fixedly connected to a connecting rod, the bottom of the connecting rod is fixedly connected to a float, the interior of the movable plug has multiple ventilation slots, the float is disposed inside the ventilation slots, the interior of the movable plug has multiple mounting slots, the interior of the mounting slots is provided with a push spring, the interior of the mounting slots is slidably connected to a limit plate, the interior of the limit plate has multiple ventilation holes, the middle of the limit plate is fixedly connected to a connecting rod, the bottom of the connecting rod is fixedly connected to a plug plate, one end of the push spring is fixedly connected to the bottom of the limit plate, and the other end of the push spring is fixedly connected to the bottom of the interior of the mounting slot.

[0008] Preferably, the locking mechanism includes two mounting blocks. The two mounting blocks are fixedly connected to the upper and lower sides of the valve body on the side away from the visual warning mechanism, respectively. A push spring is provided inside the mounting block. A limit block is slidably connected inside the mounting block. A locking block is fixedly connected to the side of the limit block away from the push spring. The upper and lower sides of the movable rod are provided with locking grooves. The side of the locking block away from the limit block engages with the inside of the locking groove. Sliding grooves are provided on both sides of the mounting block. A pull handle is fixedly connected to both sides of the limit block. The pull handle is slidably connected inside the sliding groove.

[0009] Preferably, the sound warning mechanism includes a fixed cylinder, one end of which is fixedly connected to the end of the hollow cage away from the cylinder body, and a mounting cylinder is fixedly connected to the end of the fixed cylinder away from the cylinder body. A return spring is provided at the temporal part of the mounting cylinder. A limit plate is slidably connected inside the mounting cylinder. A plug is fixedly connected to the end of the limit plate near the cylinder body. A connector is threaded to the outer end of the fixed cylinder. A vibrating plate is fixedly connected inside the connector. A return air pipe is fixedly connected to the end of the connector away from the fixed cylinder. The other end of the return air pipe is fixedly connected to the outer bottom end of the valve body. An air inlet pipe is fixedly connected to the end of the fixed cylinder away from the connector. The other end of the air inlet pipe is fixedly connected to the high-pressure end of the valve body.

[0010] Preferably, one end of the compression spring is fixedly connected to the inner top of the cylinder, and the other end of the compression spring is fixedly connected to the top of the movable plug.

[0011] Preferably, the top of the movable plug is fixedly connected to multiple risers, and the top of the connecting rod is fixedly connected to a limit frame.

[0012] Preferably, the limiting frame is slidably connected inside the riser, and the plurality of mounting slots and the plurality of ventilation slots are alternately arranged inside the movable plug.

[0013] Preferably, one end of the push spring is fixedly connected to the inside of the mounting block, and the other end of the push spring is fixedly connected to the end of the limiting block away from the locking block.

[0014] Preferably, one end of the reset spring is fixedly connected to the inner top of the mounting cylinder, and the other end of the reset spring is fixedly connected to the end of the limiting plate away from the cylinder.

[0015] This invention provides a pressure regulator for natural gas. It has the following advantages:

[0016] 1. This invention, through the coordinated operation of visual and audible warning mechanisms, can issue visual and audible warnings when the pressure regulator temperature is too high or too low. This enables timely warnings before low-temperature ice blockage occurs and when the risk of high-temperature backfire appears. Moreover, it requires no power supply, has a simpler and more reliable structure, facilitates quick handling by maintenance personnel, and reduces safety hazards when using natural gas pressure regulators.

[0017] 2. This invention uses a locking mechanism to lock the high temperature warning, which must be manually unlocked. Even if maintenance personnel do not notice it in time and the temperature returns to normal, they can still find the record of the high temperature, which makes it easier for maintenance personnel to detect and investigate, thereby further reducing safety hazards. Attached Figure Description

[0018] Figure 1 The three-dimensional representation of the present invention Figure 1 ;

[0019] Figure 2 This is a schematic diagram of the internal structure of the cylinder in this invention;

[0020] Figure 3 This is a schematic diagram of the movable rod in this invention;

[0021] Figure 4 This is a schematic diagram of the structure of the float in this invention;

[0022] Figure 5 This is a schematic diagram of the internal structure of the mounting groove in this invention;

[0023] Figure 6 This is a schematic diagram of the internal structure of the mounting block in this invention;

[0024] Figure 7 This is a schematic diagram of the card slot structure in this invention;

[0025] Figure 8 This is a schematic diagram of the internal structure of the mounting cylinder in this invention;

[0026] Figure 9 The three-dimensional representation of the present invention Figure 2.

[0027] The components include: 1. Valve body; 2. Visual warning mechanism; 201. Cylinder; 202. Compression spring; 203. Movable plug; 204. Movable rod; 205. Warning sign; 206. Fixing sleeve; 207. Hollow cage; 208. Fixing tube; 209. Tension spring; 210. Top frame; 211. Connecting rod; 212. Float; 213. Vent slot; 214. Mounting slot; 215. Push spring; 216. Limiting plate; 217. Vent; 218. Connecting rod; 2 19. Plug plate; 220. Riser pipe; 221. Limiting bracket; 3. Locking mechanism; 301. Mounting block; 302. Push spring; 303. Limiting block; 304. Locking block; 305. Locking groove; 306. Pull handle; 307. Slide groove; 4. Sound warning mechanism; 401. Fixing cylinder; 402. Mounting cylinder; 403. Return spring; 404. Limiting plate; 405. Plug; 406. Connector; 407. Vibrating plate; 408. Air return pipe; 409. Air inlet pipe. Detailed Implementation

[0028] The technical solutions in 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.

[0029] Please see the appendix Figure 1 - Appendix Figure 9 This invention provides a pressure regulator for natural gas, including a valve body 1. A visual warning mechanism 2 is fixedly connected to the low-pressure end of the valve body 1. The visual warning mechanism 2 is used to issue a visual alarm when the temperature is too high or too low. A locking mechanism 3 is provided on the outside of the valve body 1. The locking mechanism 3 is used to maintain the visual alarm state and needs to be manually released. A sound warning mechanism 4 is provided on both the upper and lower sides of the visual warning mechanism 2. The sound warning mechanism 4 can issue a sound alarm when the temperature is too high or too low and is released when the locking mechanism 3 is manually released.

[0030] The visual warning mechanism 2 includes a cylinder 201, which provides an installation position. The cylinder 201 is externally fixedly connected to the low-pressure end of the valve body 1. A compression spring 202 is installed inside the cylinder 201. A movable plug 203 is slidably connected inside the cylinder 201. A movable rod 204 is fixedly connected to the middle of the movable plug 203. Warning signs 205 are respectively provided at both ends of the movable rod 204, making it easy for workers to see. A fixing sleeve 206 is fixedly connected to the bottom of the low-pressure end of the valve body 1. The fixing sleeve 206 can cover the end of the movable rod 204. Both the top of cylinder 201 and the bottom of fixed sleeve 206 are fixedly connected to perforated cages 207. Perforated cages 207 provide an installation position and also allow workers to easily see the pop-up warning sign 205. The space inside cylinder 201 below movable plug 203 is filled with paraffin wax. Compression spring 202 can push movable plug 203 and movable rod 204 down when paraffin wax contracts, and movable plug 203 can move upward when paraffin wax expands. Multiple holes are opened at the top of cylinder 201, and one end of compression spring 202 is fixedly connected to the top of the inside of cylinder 201. The other end of the compression spring 202 is fixedly connected to the top of the movable plug 203. When the temperature at the low-pressure end of the valve body 1 rises to about 60°C, the paraffin wax inside the cylinder 201, located below the movable plug 203, begins to expand. When the temperature rises to about 70°C, the paraffin wax expands rapidly, thereby driving the movable plug 203 to move upward and compressing the compression spring 202. This, in turn, drives the movable rod 204 to move upward, causing the warning sign 205 to move into the interior of the perforated cage 207. Thus, the warning sign 205 can be seen through the perforation of the perforated cage 207, thereby enabling... To achieve a visual high-temperature alarm, when the low-pressure end temperature drops to 0℃, the paraffin inside the cylinder 201 located below the movable plug 203 begins to contract. When it reaches -5℃, it contracts rapidly. At this time, under the elastic action of the compression spring 202, it can push the movable plug 203 to move downward, which in turn can drive the movable rod 204 to move downward. At this time, the warning sign 205 located on the lower side of the movable rod 204 will move downward and enter the lower hollow cage 207. The warning sign 205 can be seen through the hollow part of the lower hollow cage 207, thus achieving a visual low-temperature alarm.

[0031] Multiple fixing tubes 208 are fixedly connected to the top of the movable plug 203, providing installation positions. A tension spring 209 is fixedly connected to the top of the fixing tube 208, and a top bracket 210 is fixedly connected to the top of the tension spring 209. A connecting rod 211 is fixedly connected to the middle of the top bracket 210, allowing the top bracket 210 to mount the connecting rod 211. A float 212 is fixedly connected to the bottom of the connecting rod 211, allowing the float 212 to float upwards when the paraffin expands. Multiple ventilation slots 213 are provided inside the movable plug 203, providing space for the paraffin to expand and for airflow to pass through when the paraffin contracts. The float 212 is positioned within the ventilation slots 213. Inside, the movable plug 203 has multiple mounting slots 214, providing mounting positions. A push spring 215 is installed inside each mounting slot 214. A limit plate 216 is slidably connected inside the mounting slot 214. When there is no airflow into the space below the movable plug 203 inside the cylinder 201, the push spring 215 can move the limit plate 216 upwards. The limit plate 216 has multiple vent holes 217, allowing airflow. A connecting rod 218 is fixedly connected to the middle of the limit plate 216, and a plug plate 219 is fixedly connected to the bottom of the connecting rod 218, blocking the hole below the mounting slot 214. One end of the push spring 215 is fixedly connected to the bottom of the limit plate 216. The other end of the push spring 215 is fixedly connected to the bottom of the mounting groove 214. Multiple risers 220 are fixedly connected to the top of the movable plug 203. A limit bracket 221 is fixedly connected to the top of the connecting rod 218. The limit bracket 221 slides inside the riser 220 to maintain the stability of the top of the connecting rod 218. The connecting rod 218 connects the plug plate 219 and the limit bracket 221. The limit bracket 221 is slidably connected inside the riser 220. Multiple mounting grooves 214 and multiple ventilation grooves 213 are staggered inside the movable plug 203. When the movable plug 203 moves upward, the space below the cylinder 201 is a sealed space. When the movable plug 203 rises, the space below the cylinder 201 is sealed. As the air pressure decreases, the expansion of paraffin wax enters the interior of the ventilation groove 213 and pushes the float 212 upward, which in turn drives the connecting rod 211 and the top frame 210 upward and stretches the tension spring 209. At this time, the float 212 can block the top of the interior of the ventilation groove 213. At this time, the interior of the ventilation groove 213 will not be ventilated, but the plug plate 219 will move downward under the action of low air pressure, and drive the connecting rod 218 downward, which can drive the limiting plate 216 downward. At this time, the ventilation hole 217 is not blocked by the inner wall of the mounting groove 214, which allows air to enter. This maintains the air pressure balance in the space below the movable plug 203 of the cylinder 201, and prevents the low air pressure of the movable plug 203 from affecting the rise of the movable plug 203.

[0032] When the movable plug 203 moves downward, the air pressure inside the cylinder 201 below the movable plug 203 increases. At this time, the high air pressure will give the plug plate 219 an upward thrust, causing the plug plate 219 to move to the bottom of the movable plug 203. The vent hole 217 will also be against the top of the inside of the mounting groove 214. At this time, the vent hole 217 is blocked and cannot exhaust air. At this time, since the paraffin is in a contracted state, it will not push the float 212 to move upward. The diameter of the vent groove 213 is larger than the diameter of the float 212, so the float 212 cannot block the vent groove 213. The gas will pass through the space next to the float 212 and be discharged through the inside of the fixed pipe 208, thereby balancing the space inside the cylinder 201 below the movable plug 203 and not affecting the movement of the movable plug 203.

[0033] The locking mechanism 3 includes two mounting blocks 301, which provide mounting space. The sides of the two mounting blocks 301 furthest from the visual warning mechanism 2 are fixedly connected to the upper and lower sides of the valve body 1, respectively. A push spring 302 is installed inside each mounting block 301, and a limit block 303 is slidably connected inside the mounting block 301, serving a limiting function. A locking block 304 is fixedly connected to the side of the limit block 303 furthest from the push spring 302. The upper and lower sides of the movable rod 204 are provided with locking grooves 305. Therefore, the side of the locking block 304 furthest from the limit block 303... The locking block 304 engages with the inside of the locking slot 305, thus preventing the compression spring 202 from pushing the movable plug 203 downward. The mounting block 301 has sliding grooves 307 on both sides. The limiting block 303 has a handle 306 fixedly connected to both sides. The handle 306 is slidably connected inside the sliding groove 307, which provides space for the handle 306 to slide. One end of the push spring 302 is fixedly connected inside the mounting block 301, and the other end of the push spring 302 is fixedly connected to the end of the limiting block 303 away from the locking block 304.

[0034] When the movable rod 204 moves up or down, it can drive the slot 305 up or down. When it moves to the position of the locking block 304, under the pushing force of the push spring 302, it can push the limiting block 303 towards the movable rod 204, thereby locking the locking block 304 inside the slot 305. At this time, it can prevent the movable rod 204 from moving down or up. After the staff discovers and solves the problem of temperature rise or fall, during the paraffin recovery time, the pull handle 306 is pulled away from the movable rod 204, which can then drive the limiting block 303 towards the valve body 1, thereby moving the locking block 304 out of the slot 305. Therefore, under the action of the compression spring 202, the movable plug 203 moves down, driving the movable rod 204 down, thereby driving the warning sign 205 down, thereby releasing the locking between the slot 305 and the locking block 304, allowing the warning sign 205 to leave. Inside the hollow cage 207, the alarm is deactivated. Since the low temperature is caused by the environment, it will not have an immediate impact. At the same time, the temperature will not rise immediately to damage the pressure reducer, and the paraffin will not immediately recover. Therefore, the staff has enough time to notice the visual alarm on the lower warning sign 205. After artificially raising the temperature, the paraffin will slowly expand and recover, and then the locking block 304 and the locking groove 305 can be manually released. Since the force of the paraffin expansion and recovery is relatively large and higher than that of the compression spring 202, and the locking groove 305 is an arc groove and the locking block 304 is also a curved surface, when the force is large enough, the squeezing force of the curved surface of the locking groove 305 can be used to squeeze the locking block 304 towards the valve body 1, and then squeeze the locking block 304 out of the interior of the locking groove 305. At this time, after artificial heating or when the low temperature does not affect the ventilation and the ambient temperature rises, the locking block 304 can automatically release the locking with the locking groove 305, and thus deactivate the low temperature visual alarm.

[0035] The audible warning mechanism 4 includes a fixed cylinder 401, which provides an installation position and ventilation space. One end of the fixed cylinder 401 near the cylinder body 201 is fixedly connected to the end of the perforated cage 207 away from the cylinder body 201. An installation cylinder 402 is fixedly connected to the end of the fixed cylinder 401 away from the cylinder body 201, providing an installation position. A return spring 403 is provided at the temporal portion of the installation cylinder 402. A limit plate 404 is slidably connected inside the installation cylinder 402, serving a limiting function. The end of the limit plate 404 near the cylinder body 201 is fixedly connected to… A plunger 405 is provided, which can block the inside of the fixed cylinder 401 to prevent gas from flowing out. A connector 406 is threaded to one end of the fixed cylinder 401. A vibrating plate 407 is fixedly connected inside the connector 406. One end of the connector 406 is larger than the other. High-pressure airflow flows from the larger end to the smaller end, thereby further increasing the air pressure, which in turn blows the vibrating plate 407 to produce a whistle, realizing an audible alarm. A return air pipe 408 is fixedly connected to the end of the connector 406 away from the fixed cylinder 401. The return air pipe 408 can return the high-pressure airflow to the inside of the valve body 1. To reduce pressure, the other end of the return air pipe 408 is fixedly connected to the bottom of the valve body 1. An inlet pipe 409 is fixedly connected to the end of the fixed cylinder 401 furthest from the connector 406, allowing high-pressure airflow into the interior of the fixed cylinder 401. The other end of the inlet pipe 409 is fixedly connected to the high-pressure end of the valve body 1. One end of the return spring 403 is fixedly connected to the top of the interior of the mounting cylinder 402, and the other end is fixedly connected to the end of the limit plate 404 furthest from the cylinder 201. When the movable rod 204 moves upward or downward, the movable rod 20... The top or bottom of 4 can push the upper plug 405 upward or the lower plug 405 downward, thereby causing the plug 405 to leave the interior of the fixed cylinder 401. At this time, the high-pressure gas can enter the interior of the fixed cylinder 401 through the air inlet pipe 409 and enter the interior of the connector 406. When the high-pressure gas passes through the vibrating plate 407, it can cause the vibrating plate 407 to vibrate, thereby emitting a sound and realizing an audible alarm. The gas passing through the interior of the connector 406 can flow back to the interior of the valve body 1 through the return pipe 408 to continue to reduce pressure.

[0036] Working principle: When the temperature at the low-pressure end of valve body 1 rises to about 60℃, the paraffin wax inside cylinder 201, located below the movable plug 203, begins to expand. When the temperature rises to about 70℃, the paraffin wax expands rapidly, causing the movable plug 203 to move upward and compress the spring 202. This, in turn, causes the movable rod 204 to move upward, moving the warning sign 205 into the interior of the perforated cage 207. The warning sign 205 becomes visible through the perforation of the perforated cage 207, thus providing a visual high-temperature alarm. When the low-pressure end temperature drops to 0℃, the paraffin inside the cylinder 201 located in the space below the movable plug 203 begins to contract. When it reaches -5℃, it contracts rapidly. At this time, under the elastic action of the compression spring 202, it can push the movable plug 203 to move downward, which in turn can drive the movable rod 204 to move downward. At this time, the warning sign 205 located on the lower side of the movable rod 204 will move downward and enter the lower hollow cage 207. The warning sign 205 can be seen through the hollow part of the lower hollow cage 207, realizing a visual low temperature alarm.

[0037] When the movable plug 203 moves upward, the space below the movable plug 203 of the cylinder 201 is a sealed space. When the movable plug 203 rises, the air pressure in the space below the movable plug 203 of the cylinder 201 decreases. As the paraffin expands, it enters the interior of the venting groove 213 and pushes the float 212 upward, which in turn drives the connecting rod 211 and the top frame 210 upward and stretches the tension spring 209. At this time, the float 212 can block the top of the interior of the venting groove 213. At this time, the interior of the venting groove 213 will not be ventilated, but the plug plate 219 will move downward under the action of low air pressure, which will drive the connecting rod 218 downward, thereby driving the limiting plate 216 downward. At this time, the vent 217 is not blocked by the inner wall of the mounting groove 214, which allows air to enter. This maintains the air pressure balance in the space below the movable plug 203 of the cylinder 201, preventing the low air pressure of the movable plug 203 from affecting its rise.

[0038] When the movable plug 203 moves downward, the air pressure inside the cylinder 201 below the movable plug 203 increases. At this time, the high air pressure will give the plug plate 219 an upward thrust, causing the plug plate 219 to move to the bottom of the movable plug 203. The vent hole 217 will also be against the top of the inside of the mounting groove 214. At this time, the vent hole 217 is blocked and cannot exhaust air. At this time, since the paraffin is in a contracted state, it will not push the float 212 to move upward. The diameter of the vent groove 213 is larger than the diameter of the float 212, so the float 212 cannot block the vent groove 213. The gas will pass through the space next to the float 212 and be discharged through the inside of the fixed pipe 208, thereby balancing the space inside the cylinder 201 below the movable plug 203 and thus not affecting the movement of the movable plug 203.

[0039] When the movable rod 204 moves up or down, it can drive the slot 305 up or down. When it moves to the position of the locking block 304, under the pushing force of the push spring 302, it can push the limit block 303 towards the movable rod 204, thereby locking the locking block 304 inside the slot 305. At this time, it can prevent the movable rod 204 from moving down or up. After the staff discovers and solves the problem of temperature rise or fall, during the paraffin recovery time, the pull handle 306 is pulled away from the movable rod 204, which can then drive the limit block 303 towards the valve body 1, thereby moving the locking block 304 out of the slot 305. Therefore, under the action of the compression spring 202, the movable plug 203 moves down, driving the movable rod 204 down, thereby driving the warning sign 205 down, thus releasing the slot 305 from the locking block 304. The low temperature is caused by environmental factors and will not have an immediate impact. At the same time, the temperature will not rise immediately to damage the pressure reducer, and the paraffin will not immediately recover. Therefore, the staff has enough time to notice the visual alarm of the lower warning sign 205. After the temperature is artificially increased, the paraffin will slowly expand and recover, and then the locking block 304 and the locking groove 305 can be manually released. Since the force of the paraffin expansion and recovery is large and higher than that of the compression spring 202, and the locking groove 305 is an arc groove and the locking block 304 is also a curved surface, when the force is large enough, the squeezing force of the curved surface of the locking groove 305 can be used to squeeze the locking block 304 towards the valve body 1, and then the locking block 304 can be squeezed out of the interior of the locking groove 305. At this time, after the temperature is artificially increased, the locking block 304 will automatically release from the locking groove 305, and then the visual alarm of low temperature can be deactivated.

[0040] When the movable rod 204 moves up or down, the top or bottom of the movable rod 204 can push the upper plug 405 upward or the lower plug 405 downward, thereby causing the plug 405 to leave the interior of the fixed cylinder 401. At this time, the high-pressure gas can enter the interior of the fixed cylinder 401 through the air inlet pipe 409 and enter the interior of the connector 406. When the high-pressure gas passes through the vibrating plate 407, it can cause the vibrating plate 407 to vibrate, thereby emitting a sound and realizing an audible alarm. The gas passing through the interior of the connector 406 can flow back to the interior of the valve body 1 through the return air pipe 408 to continue to reduce pressure.

[0041] 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 pressure regulator for natural gas, comprising a valve body (1), characterized in that, A visual warning mechanism (2) is fixedly connected to the low-pressure end of the valve body (1). The visual warning mechanism (2) is used to issue a visual alarm when the temperature is too high or too low. A locking mechanism (3) is provided on the outside of the valve body (1). The locking mechanism (3) is used to maintain the visual alarm state and needs to be manually released. A sound warning mechanism (4) is provided on both the upper and lower sides of the visual warning mechanism (2). The sound warning mechanism (4) can issue a sound alarm when the temperature is too high or too low and is released when the locking mechanism (3) is manually released.

2. A pressure regulator for natural gas according to claim 1, characterized in that, The visual warning mechanism (2) includes a cylinder (201), the outside of which is fixedly connected to the low-pressure end of the valve body (1). A compression spring (202) is provided inside the cylinder (201). A movable plug (203) is slidably connected inside the cylinder (201). A movable rod (204) is fixedly connected to the middle of the movable plug (203). Warning signs (205) are provided at both ends of the movable rod (204). A fixed sleeve (206) is fixedly connected to the bottom of the low-pressure end of the valve body (1). A hollow cage (207) is fixedly connected to the top of the cylinder (201) and the bottom of the fixed sleeve (206). Paraffin wax is provided in the space below the movable plug (203) inside the cylinder (201). Multiple holes are opened on the top of the cylinder (201).

3. A pressure regulator for natural gas according to claim 2, characterized in that, The top of the movable plug (203) is fixedly connected to multiple fixed tubes (208), the top of the fixed tubes (208) is fixedly connected to a tension spring (209), the top of the tension spring (209) is fixedly connected to a top bracket (210), the middle of the top bracket (210) is fixedly connected to a connecting rod (211), and the bottom of the connecting rod (211) is fixedly connected to a float (212). The movable plug (203) has multiple ventilation slots (213) inside, the float (212) is disposed inside the ventilation slots (213), and the movable plug (203) has multiple mounting slots inside. (214) A push spring (215) is provided inside the mounting groove (214). A limit plate (216) is slidably connected inside the mounting groove (214). A plurality of ventilation holes (217) are opened inside the limit plate (216). A connecting rod (218) is fixedly connected to the middle of the limit plate (216). A plug plate (219) is fixedly connected to the bottom of the connecting rod (218). One end of the push spring (215) is fixedly connected to the bottom of the limit plate (216), and the other end of the push spring (215) is fixedly connected to the bottom of the mounting groove (214).

4. A pressure regulator for natural gas according to claim 2, characterized in that, The locking mechanism (3) includes two mounting blocks (301). The two mounting blocks (301) are fixedly connected to the upper and lower sides of the valve body (1) on the side away from the visual warning mechanism (2). A push spring (302) is provided inside the mounting block (301). A limit block (303) is slidably connected inside the mounting block (301). A locking block (304) is fixedly connected to the side of the limit block (303) away from the push spring (302). A slot (305) is provided on the upper and lower sides of the movable rod (204). The side of the locking block (304) away from the limit block (303) engages with the inside of the slot (305). A sliding groove (307) is provided on both sides of the mounting block (301). A pull handle (306) is fixedly connected to both sides of the limit block (303). The pull handle (306) is slidably connected inside the sliding groove (307).

5. A pressure regulator for natural gas according to claim 2, characterized in that, The sound warning mechanism (4) includes a fixed cylinder (401), one end of which is fixedly connected to the end of the hollow cage (207) away from the cylinder body (201). A mounting cylinder (402) is fixedly connected to the other end of the fixed cylinder (401) away from the cylinder body (201). A return spring (403) is provided at the temporal portion of the mounting cylinder (402). A limiting plate (404) is slidably connected inside the mounting cylinder (402). A stopper (403) is fixedly connected to the end of the limiting plate (404) near the cylinder body (201). 5) A connector (406) is threaded to one end of the fixed cylinder (401). A vibrating plate (407) is fixedly connected inside the connector (406). A return air pipe (408) is fixedly connected to one end of the connector (406) away from the fixed cylinder (401). The other end of the return air pipe (408) is fixedly connected to the bottom of the valve body (1). An air inlet pipe (409) is fixedly connected to one end of the fixed cylinder (401) away from the connector (406). The other end of the air inlet pipe (409) is fixedly connected to the high-pressure end of the valve body (1).

6. A pressure regulator for natural gas according to claim 2, characterized in that, One end of the compression spring (202) is fixedly connected to the top of the inside of the cylinder (201), and the other end of the compression spring (202) is fixedly connected to the top of the movable plug (203).

7. A pressure regulator for natural gas according to claim 3, characterized in that, The top of the movable plug (203) is fixedly connected to multiple risers (220), and the top of the connecting rod (218) is fixedly connected to a limit frame (221).

8. A pressure regulator for natural gas according to claim 7, characterized in that, The limiting bracket (221) is slidably connected inside the riser (220), and the plurality of mounting slots (214) and the plurality of ventilation slots (213) are staggered inside the movable plug (203).

9. A pressure regulator for natural gas according to claim 4, characterized in that, One end of the push spring (302) is fixedly connected to the inside of the mounting block (301), and the other end of the push spring (302) is fixedly connected to the end of the limiting block (303) away from the locking block (304).

10. A pressure regulator for natural gas according to claim 5, characterized in that, One end of the reset spring (403) is fixedly connected to the inner top of the mounting cylinder (402), and the other end of the reset spring (403) is fixedly connected to the end of the limiting plate (404) away from the cylinder (201).

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