Liquefied gas steel cylinder pressure regulating valve with protective structure

Abstract

The invention discloses a liquefied gas steel cylinder pressure regulating valve with a protection structure, and relates to the technical field of liquefied gas steel cylinder pressure regulating valves, the liquefied gas steel cylinder pressure regulating valve comprises a lower valve cover, the front end of the lower valve cover is communicated with a gas outlet pipe, the front end of the gas outlet pipe is connected with a gas outlet connector, the rear end of the lower valve cover is communicated with a gas inlet pipe, and the rear end of the gas inlet pipe is connected with a gas inlet connector; the outer portion of the rear end of the air inlet pipe is sleeved with a connecting threaded pipe sleeve, the connecting threaded pipe sleeve is located at the front end of the air inlet connector, a pressure adjusting diaphragm is arranged at the upper end of the lower valve deck, and an upper valve deck is arranged at the upper end of the pressure adjusting diaphragm. The liquefied gas flow rate is converted into hydraulic pressure, the feedback connecting rod is driven to move, and then the action of the overflowing protection assembly is controlled. Flow changes can be accurately monitored, a protection mechanism is triggered during overrun, response is sensitive, external electric power or a complex sensor is not needed, the structure is simple, and reliability is high.

Description

Technical Field

[0001] The present invention belongs to the technical field of related liquefied gas cylinder pressure regulating valves, and in particular relates to a liquefied gas cylinder pressure regulating valve with a protective structure. Background Art

[0002] In the traditional application of liquefied gas cylinder pressure regulating valves, there are common problems such as insufficient pressure regulation accuracy and slow response to sudden flow changes.

[0003] Existing technologies often utilize valve pads and inlet nozzles for pressure regulation. This lacks flow regulation precision, leading to inaccurate and unstable pressure regulation, impacting the combustion efficiency and safety of gas equipment. Furthermore, when a gas pipeline becomes detached or damaged, conventional pressure regulating valves are slow to shut off the gas source, potentially causing large-scale liquefied gas leaks and posing a serious safety hazard.

[0004] To address the above issues, this patent proposes a liquefied gas pressure regulating valve solution that can achieve precise pressure regulation, has automatic flow monitoring and quick shut-off functions, and takes into account both structural reliability and operational convenience, so as to improve the safety and stability of liquefied gas during use and meet the increasingly stringent requirements for gas equipment safety standards in households and industries. Summary of the Invention

[0005] The purpose of the present invention is to provide a liquefied gas cylinder pressure regulating valve with a protective structure to solve the problems of insufficient pressure regulation accuracy and slow response to sudden flow changes in traditional liquefied gas cylinder pressure regulating valves raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a liquefied gas cylinder pressure regulating valve with a protective structure, comprising a lower valve cover, the front end of the lower valve cover is connected to an air outlet pipe, the front end of the air outlet pipe is connected to an air outlet connector, the rear end of the lower valve cover is connected to an air inlet pipe, the rear end of the air inlet pipe is connected to an air inlet connector, the rear end of the air inlet pipe is externally sleeved with a connecting threaded pipe sleeve, and the connecting threaded pipe sleeve is located at the front end of the air inlet connector, the upper end of the lower valve cover is provided with a pressure regulating diaphragm, the upper end of the pressure regulating diaphragm is provided with an upper valve cover, and the upper valve cover is connected to the lower valve cover by screws, the pressure regulating diaphragm is connected to the lower valve cover and the upper valve cover A sealing gasket is provided between the covers, a pressure-regulating spring is provided at the center of the upper end of the pressure-regulating diaphragm, and the pressure-regulating spring is located inside the upper valve cover and elastically connected between the pressure-regulating diaphragm and the upper valve cover, the front side of the left end of the intake pipe is connected to a pressure gauge through a pressure measuring tube, a pressure-regulating feedback component is provided inside the rear end of the lower valve cover, and the pressure-regulating feedback component is provided between the intake pipe and the pressure-regulating diaphragm, an overflow protection component is provided inside the intake pipe, and the overflow protection component is located on the rear side of the connection between the pressure measuring tube and the intake pipe, a flow measurement feedback component is connected to the rear side of the overflow protection component, and the flow measurement feedback component is located inside the rear end of the intake pipe.

[0007] Preferably, the pressure regulating feedback assembly includes a front pressure regulating lever, a rear pressure regulating lever, a flow control pipe head and a flow control pipe sleeve, a pressure regulating connecting rod is connected to the center of the lower end of the pressure regulating diaphragm, the rear side of the lower end of the pressure regulating connecting rod is rotatably connected to the front pressure regulating lever, the rear end of the front pressure regulating lever is sleeved with the rear pressure regulating lever, and the front pressure regulating lever is inserted into the front end of the rear pressure regulating lever and is slidably connected to the rear pressure regulating lever, the front sides of the left and right ends of the rear pressure regulating lever are rotatably connected to support rods through pressure regulating shafts, and the two support rods are fixedly connected to the inner wall of the lower end of the lower valve cover.

[0008] Preferably, an arc-shaped flow control pipe head is connected to the rear side of the lower end of the rear pressure regulating lever, the flow control pipe head opens downward, and a plurality of flow control grooves are provided on the outer wall of the flow control pipe head, and is connected to the interior of the lower valve cover through the flow control grooves, the rear end of the lower valve cover is connected to a connecting pipe, and the rear end of the connecting pipe is connected to the air intake pipe, the front side of the upper end of the connecting pipe is connected to an arc-shaped flow control pipe sleeve, and the flow control pipe head is slidably connected to the inside of the flow control pipe sleeve.

[0009] Preferably, the overcurrent protection component includes a sealing baffle, a sealing hole and a sealing head. A sealing baffle is provided inside the front end of the intake pipe, and the sealing baffle is located on the rear side of the connection between the pressure measuring tube and the intake pipe. A sealing hole is provided on the upper side of the rear end of the pressure gauge, and a sealing head is provided on the lower side of the rear end of the sealing baffle, and the front end of the sealing head is hemispherical and fits on the outer wall of the rear end of the sealing baffle.

[0010] Preferably, a telescopic slide is connected to the right side of the rear end of the sealing head, and the rear end of the telescopic slide is connected to a limiting baffle. The outside of the telescopic slide is sleeved on the limiting connecting seat, and the right end of the limiting connecting seat is flat. The inside of the limiting connecting seat is connected to two connecting inner plates that are symmetrically arranged up and down, and the two connecting inner plates are respectively located on the upper and lower sides of the center of the limiting connecting seat.

[0011] Preferably, a feedback link is inserted into the upper end of the limit connecting seat, and the lower end of the feedback link passes through the two connecting inner plates and is connected to the two connecting inner plates through a limit ring. The upper end of the feedback link passes through the intake pipe and the interior of the limit connecting seat and extends to the outside of the upper end of the intake pipe. A return gear is connected to the lower side of the outside of the feedback link, and the return gear is rotatably connected between the two connecting inner plates.

[0012] Preferably, a return rack is provided at the center of the left end of the telescopic slide, and the return gear is engaged with the left end of the return rack, a sealing spring is provided between the sealing head and the limit connecting seat, a limit slide is provided at the right end of the limit connecting seat, and the limit slide is fixedly connected to the outer wall of the air intake pipe and is slidably connected to the plane of the right end of the limit connecting seat.

[0013] Preferably, the flow measurement feedback assembly includes a height adjustment cylinder, a drive ring, a boost cylinder, a pressure measuring fan blade and a boost spiral fan blade. The front side of the upper end of the intake pipe is connected to the height adjustment cylinder, and the lower end of the height adjustment cylinder is slidably connected to the drive ring, and the drive ring is connected to the outside of the feedback connecting rod. A plurality of pressure relief holes are opened on the inside and outside of the drive ring.

[0014] Preferably, a height adjustment spring is provided at the upper end of the driving ring and is elastically connected to the inside of the height adjustment cylinder through the height adjustment spring. A return knob is provided at the upper end of the height adjustment cylinder, and the return knob is connected to the top of the feedback connecting rod. The upper end of the height adjustment cylinder is connected to a return pipe, and the lower end of the height adjustment cylinder is connected to a boost pipe. The return pipe and the boost pipe both pass through the inside of the intake pipe and the outer wall of the height adjustment cylinder, and extend to the inside of the intake pipe.

[0015] Preferably, the return pipe and the other end of the boost pipe are connected to a boost cylinder, and the boost cylinder is fixed to the inside of the intake pipe through a connecting rod, the return pipe is connected to the rear end of the boost cylinder, and the boost pipe is connected to the front end of the boost cylinder, a connecting shaft passes through the inside of the rear end of the boost cylinder, a plurality of pressure measuring blades are connected to the rear side of the outer wall of the connecting shaft, and the plurality of pressure measuring blades are located on the rear side of the boost cylinder and are rotatably connected to the inside of the intake pipe, a boost spiral blade is connected to the front side of the outer wall of the connecting shaft, and the boost spiral blade is rotatably connected to the inside of the boost cylinder.

[0016] Compared with the prior art, the present invention provides a liquefied gas cylinder pressure regulating valve with a protective structure, which has the following beneficial effects:

[0017] 1. The present invention adopts a sliding connection design of the front pressure regulating lever and the rear pressure regulating lever, combined with the cooperation of the flow control pipe head and the flow control pipe sleeve, and adjusts the opening size of the flow control groove by rotating and sliding the lever, thereby accurately controlling the output pressure of the liquefied gas and automatically adjusting the intake flow rate according to the changes in the internal air pressure of the lower valve cover, ensuring stable output pressure, improving pressure regulation accuracy and response speed, and enhancing safety and reliability.

[0018] The overcurrent protection assembly utilizes a coordinated design of a blocking baffle, a blocking head, and a blocking spring. When the liquefied gas flow exceeds the safety threshold, the flow measurement feedback assembly drives the blocking head into the blocking hole, quickly blocking the gas source. This automatically shuts off the gas supply in the event of a leak or damage to the gas pipeline, preventing large-scale gas leakage and minimizing safety hazards. Resetting the system is simple: simply turn the feedback link to restore the gas supply.

[0019] 3. The flow measurement feedback assembly of the present invention converts the liquefied gas flow rate into hydraulic pressure through a pressure-measuring fan blade, a booster propeller blade, and a hydraulic oil circulation system. This drives the movement of the feedback connecting rod, which in turn controls the operation of the overcurrent protection assembly. This assembly accurately monitors flow rate changes and triggers the protection mechanism when flow exceeds the limit. It is highly responsive, requires no external power or complex sensors, and offers a simple structure and high reliability.

[0020] 4. The overcurrent protection component of the present invention adopts a mechanical trigger and manual reset design. Through the cooperation of the return gear, rack and feedback connecting rod, it can quickly restore the air supply after the fault is eliminated, and the operation is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the liquefied gas cylinder pressure regulating valve of the present invention.

[0022] Figure 2 It is a schematic diagram of the three-dimensional cross-sectional structure of the liquefied gas cylinder pressure regulating valve of the present invention.

[0023] Figure 3 It is a schematic structural diagram of the voltage regulation feedback component of the present invention.

[0024] Figure 4 It is a schematic diagram of the connection structure of the rear pressure regulating lever of the present invention.

[0025] Figure 5 It is a schematic diagram of the connection structure of the overcurrent protection component and the current measurement feedback component of the present invention.

[0026] Figure 6 It is a schematic diagram of the connection structure of the limiting connection seat of the present invention.

[0027] Figure 7 It is a schematic diagram of the boost cylinder connection structure of the present invention.

[0028] Figure: 1, lower valve cover; 2, outlet pipe; 3, outlet connector; 4, inlet pipe; 5, inlet connector; 6, connecting threaded pipe sleeve; 7, pressure regulating diaphragm; 8, upper valve cover; 9, pressure regulating spring; 10, pressure gauge; 11, pressure regulating connecting rod; 12, front pressure regulating lever; 13, rear pressure regulating lever; 14, support rod; 15, flow control pipe head; 16, flow control groove; 17, connecting pipe; 18, flow control pipe sleeve; 19, blocking plate; 20, blocking hole; 21, blocking head ; 22. Telescopic slide; 23. Limit baffle; 24. Limit connecting seat; 25. Connecting inner plate; 26. Feedback connecting rod; 27. Return gear; 28. Return gear rail; 29. Blocking spring; 30. Limit slide; 31. Height adjustment cylinder; 32. Drive ring; 33. Pressure relief hole; 34. Height adjustment spring; 35. Return knob; 36. Return pipe; 37. Boost pipe; 38. Boost cylinder; 39. Connecting shaft; 40. Pressure measuring fan blade; 41. Boosting spiral fan blade. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] The present invention provides Figure 1-Figure 7 The liquefied gas cylinder pressure regulating valve with a protective structure shown in the figure comprises a lower valve cover 1, the front end of the lower valve cover 1 is connected to an outlet pipe 2, the front end of the outlet pipe 2 is connected to an outlet connector 3, the rear end of the lower valve cover 1 is connected to an air inlet pipe 4, the rear end of the air inlet pipe 4 is connected to an air inlet connector 5, the rear end of the air inlet pipe 4 is sleeved with a connecting threaded pipe sleeve 6 on the outside, and the connecting threaded pipe sleeve 6 is located at the front end of the air inlet connector 5, a pressure regulating diaphragm 7 is provided on the upper end of the lower valve cover 1, an upper valve cover 8 is provided on the upper end of the pressure regulating diaphragm 7, and the upper valve cover 8 is connected to the lower valve cover 1 by screws, a sealing gasket is provided between the pressure regulating diaphragm 7 and the lower valve cover 1 and the upper valve cover 8, a pressure regulating spring 9 is provided at the center of the upper end of the pressure regulating diaphragm 7, and the pressure regulating spring 9 is located inside the upper valve cover 8 and elastically connected between the pressure regulating diaphragm 7 and the upper valve cover 8, the front side of the left end of the air inlet pipe 4 is connected to Pressure gauge 10, a pressure regulating feedback component is provided inside the rear end of the lower valve cover 1, and the pressure regulating feedback component is provided between the air inlet pipe 4 and the pressure regulating diaphragm 7, an overflow protection component is provided inside the air inlet pipe 4, and the overflow protection component is located on the rear side of the connection between the pressure measuring tube and the air inlet pipe 4, a flow measuring feedback component is connected to the rear side of the overflow protection component, and the flow measuring feedback component is located inside the rear end of the air inlet pipe 4, the liquefied gas cylinder is connected to the gas stove pipeline through the pressure regulating valve, which is used to control the output pressure of the liquefied gas to ensure gas safety and stable operation of the equipment, wherein the pressure regulating valve is connected to the gas stove pipeline through the air outlet connector 3, and is connected to the liquefied gas cylinder through the air inlet connector 5 and the connecting threaded pipe sleeve 6, and the liquefied gas is transported through the lower valve cover 1, the air outlet pipe 2 and the air inlet pipe 4, and the air pressure inside the liquefied gas cylinder is monitored by the pressure gauge 10.

[0031] During this process, the upper end of the lower valve cover 1 is sealed by the upper valve cover 8, and the output pressure of the liquefied gas is controlled by the cooperation between the pressure regulating diaphragm 7, the pressure regulating spring 9 and the pressure regulating feedback component. At the same time, the flow rate of the liquefied gas output is monitored by the flow measuring feedback component. When the liquefied gas output flow rate at one end of the outlet pipe 2 exceeds the safety threshold, the flow measuring feedback component can seal the inlet pipe 4 through the overcurrent protection component, blocking the connection between the lower valve cover 1 and the inlet pipe 4, automatically cutting off the gas source, and preventing the liquefied gas from leaking due to the falling off or damage of the gas stove pipeline, causing safety hazards, thereby playing a protective role.

[0032] like Figure 2-Figure 4As shown, the pressure regulating feedback assembly includes a front pressure regulating lever 12, a rear pressure regulating lever 13, a flow control pipe head 15 and a flow control pipe sleeve 18. The center of the lower end of the pressure regulating diaphragm 7 is connected to a pressure regulating connecting rod 11. The rear side of the lower end of the pressure regulating connecting rod 11 is rotatably connected to the front pressure regulating lever 12. The rear end of the front pressure regulating lever 12 is sleeved with the rear pressure regulating lever 13, and the front pressure regulating lever 12 is inserted into the front end of the rear pressure regulating lever 13 and is slidably connected to the rear pressure regulating lever 13. The front sides of the left and right ends of the rear pressure regulating lever 13 are rotatably connected to the support rods 14 through the pressure regulating shaft, and the two support rods 14 are fixedly connected Connected to the inner wall of the lower end of the lower valve cover 1, the rear side of the lower end of the rear pressure regulating lever 13 is connected to an arc-shaped flow control pipe head 15, the flow control pipe head 15 opens downward, and a plurality of flow control grooves 16 are opened on the outer wall of the flow control pipe head 15, and is connected to the interior of the lower valve cover 1 through the flow control grooves 16. The rear end of the lower valve cover 1 is connected to a connecting pipe 17, and the rear end of the connecting pipe 17 is connected to the intake pipe 4. The front side of the upper end of the connecting pipe 17 is connected to an arc-shaped flow control pipe sleeve 18, and the flow control pipe head 15 is slidably connected to the inside of the flow control pipe sleeve 18. In the process of controlling the output pressure of the liquefied gas, due to the lower valve cover 1 The air inlet pipe 4 is connected to the flow control pipe sleeve 18 through the connecting pipe 17. The flow control pipe head 15 controls the size of the openings of the multiple flow control grooves 16 exposed by sliding inside the flow control pipe sleeve 18, and controls the flow between the lower valve cover 1 and the air inlet pipe 4 through the size of the openings of the multiple flow control grooves 16 exposed. Therefore, when the flow rate of the liquefied gas output by the outlet pipe 2 changes, the flow rate of the liquefied gas transported by the air inlet pipe 4 to the lower valve cover 1 remains unchanged, causing the air pressure inside the lower valve cover 1 to change. At this time, the pressure regulating diaphragm 7 acts on the pressure change inside the lower valve cover 1 and the pressure regulating spring Under the action of the spring 9, it deforms up and down, and drives the front pressure-regulating lever 12 and the rear pressure-regulating lever 13 to rotate between the two support rods 14 through the pressure-regulating connecting rod 11, and then drives the flow-control pipe head 15 to slide inside the flow-control pipe sleeve 18 through the front pressure-regulating lever 12 and the rear pressure-regulating lever 13, thereby adjusting the size of the openings exposed by the multiple flow-control grooves 16, and then controlling the flow rate of liquefied gas transported by the intake pipe 4 to the lower valve cover 1, and the front pressure-regulating lever 12 and the rear pressure-regulating lever 13 can adjust their positions with the pressure-regulating connecting rod 11 by sliding against each other during the rotation process.

[0033] Among them, when the flow rate of liquefied gas output by the outlet pipe 2 decreases, the air pressure inside the lower valve cover 1 increases, the pressure-regulating diaphragm 7 deforms upward, and drives the front end of the front pressure-regulating lever 12 to rotate upward through the pressure-regulating connecting rod 11, and drives the rear end of the rear pressure-regulating lever 13 to rotate downward. The rear pressure-regulating lever 13 drives the flow-control pipe head 15 to slide into the inside of the flow-control pipe sleeve 18, reducing the size of the openings exposed by the multiple flow-control grooves 16, reducing the flow rate of liquefied gas transported by the air inlet pipe 4 to the inside of the lower valve cover 1, and reducing the pressure inside the lower valve cover 1. When the elastic force of the compression spring 9 reaches equilibrium, the pressure-regulating diaphragm 7 stops deforming and the pressure-regulating feedback assembly stops running, so that the pressure inside the lower valve cover 1 remains stable, ensuring that the output pressure of the lower valve cover 1 is stable. Conversely, the size of the openings exposed by the multiple flow-control grooves 16 is increased, and the flow rate of the liquefied gas transported to the lower valve cover 1 by the air inlet pipe 4 is increased, thereby increasing the pressure inside the lower valve cover 1 and performing stable output when the internal pressure of the lower valve cover 1 and the elastic force of the pressure-regulating spring 9 reach equilibrium, thereby ensuring the stable output of liquefied gas, gas safety, and stable operation of the equipment.

[0034] like Figure 2 、 Figure 5 and Figure 6As shown, the overcurrent protection component includes a blocking baffle 19, a blocking hole 20 and a blocking head 21. A blocking baffle 19 is provided inside the front end of the air inlet pipe 4, and the blocking baffle 19 is located on the rear side of the connection between the pressure measuring tube and the air inlet pipe 4. A blocking hole 20 is provided on the upper side of the rear end of the pressure gauge 10, and a blocking head 21 is provided on the lower side of the rear end of the blocking baffle 19. The front end of the blocking head 21 is hemispherical and fits on the outer wall of the rear end of the blocking baffle 19. A telescopic slide 22 is connected to the right side of the rear end of the blocking head 21, and the rear end of the telescopic slide 22 is connected to a limiting baffle 23. The outside of the telescopic slide 22 is sleeved with a limiting connecting seat 24, and the right end of the limiting connecting seat 24 is flat, and the inside of the limiting connecting seat 24 is connected with two symmetrically arranged upper and lower parts. The inner plate 25 is connected, and the two inner plates 25 are respectively located at the upper and lower sides of the center of the limit connecting seat 24. A feedback link 26 is inserted into the upper end of the limit connecting seat 24, and the lower end of the feedback link 26 passes through the two connecting inner plates 25 and is connected to the two connecting inner plates 25 through a limit ring. The upper end of the feedback link 26 passes through the intake pipe 4 and the interior of the limit connecting seat 24, and extends to the outside of the upper end of the intake pipe 4. A return gear 27 is connected to the lower side of the outside of the feedback link 26, and the return gear 27 is rotatably connected between the two connecting inner plates 25. A return rack 28 is provided at the center of the left end of the telescopic slide 22, and the return gear 27 is engaged with the left end of the return rack 28. A stop is set between the sealing head 21 and the limit connecting seat 24. A blocking spring 29 is provided, and a limiting slide 30 is provided at the right end of the limiting connecting seat 24, and the limiting slide 30 is fixedly connected to the outer wall of the air inlet pipe 4, and is slidably connected to the plane of the right end of the limiting connecting seat 24. When the gas stove pipeline falls off or is damaged, the output flow of the outlet pipe 2 will suddenly increase, and cause the delivery flow of the air inlet pipe 4 to the inside of the lower valve cover 1 to suddenly increase, and quickly exceed the safety threshold. At this time, the flow measurement feedback component will drive the feedback connecting rod 26 to slide upward under the action of the suddenly increased flow. Since the limiting connecting seat 24 is limited in the vertical direction by connecting the inner plate 25 and the limiting ring and the feedback connecting rod 26, and is limited in the horizontal direction by the limiting slide 30 and the air inlet pipe 4, the limiting link The connecting seat 24 can only slide up and down and cannot rotate, so that the feedback connecting rod 26 can drive the limiting connecting seat 24 to slide upward by connecting the inner plate 25 and the limiting ring, and drive the sealing head 21, the telescopic slide 22 and the limiting baffle 23 to move upward through the limiting connecting seat 24. When the sealing head 21 moves to the position of the blocking hole 20, the sealing head 21 is stuck forward into the inside of the blocking hole 20 under the action of the blocking spring 29, blocking the blocking hole 20, thereby blocking the inside of the air intake pipe 4, blocking the circulation of liquefied gas, stopping the supply of liquefied gas, and preventing liquefied gas leakage from causing safety hazards. At the same time, the telescopic slide 22 can limit the sliding position through the limiting baffle 23 to prevent it from sliding completely from the inside of the limiting connecting seat 24.

[0035] In addition, after eliminating the safety hazard, by rotating the feedback link 26, the feedback link 26 drives the return gear 27 to rotate, and the engagement between the return gear 27 and the return rack 28 drives the telescopic slide 22 to slide backward inside the limit connecting seat 24, thereby driving the blocking head 21 to be stuck out of the blocking hole 20. At the same time that the blocking head 21 is stuck out of the blocking hole 20, the feedback link 26 slides downward under the action of the flow measurement feedback component, and drives the blocking head 21 back to its original position, so that the inside of the intake pipe 4 is unobstructed again, allowing the intake pipe 4 to resume the transportation of liquefied gas and restore the stable operation of the equipment.

[0036] like Figure 2 、 Figure 5 and Figure 7As shown, the flow measurement feedback component includes a height adjustment cylinder 31, a drive ring 32, a boost cylinder 38, a pressure measuring fan blade 40 and a boost spiral fan blade 41. The front side of the upper end of the intake pipe 4 is connected to the height adjustment cylinder 31, and the lower end of the height adjustment cylinder 31 is slidably connected to the drive ring 32, and the drive ring 32 is connected to the outside of the feedback connecting rod 26. A plurality of pressure relief holes 33 are provided on the outside of the drive ring 32. A height adjustment spring 34 is provided on the upper end of the drive ring 32, and is elastically connected to the inside of the height adjustment cylinder 31 through the height adjustment spring 34. A return knob 35 is provided on the upper end of the height adjustment cylinder 31, and the return knob 35 is connected to the top of the feedback connecting rod 26. The upper end of the height adjustment cylinder 31 is connected to a return pipe 36, and the lower end of the height adjustment cylinder 31 is connected to a boost pipe 37. The return pipe 36 and the boost pipe 37 both pass through the intake pipe. The tube 4 and the outer wall of the height adjustment tube 31 are connected to the inside of the air intake pipe 4. The other ends of the return pipe 36 and the boost pipe 37 are connected to the boost cylinder 38, and the boost cylinder 38 is fixed to the inside of the air intake pipe 4 by a connecting rod. The return pipe 36 is connected to the rear end of the boost cylinder 38, and the boost pipe 37 is connected to the front end of the boost cylinder 38. A connecting shaft 39 runs through the rear end of the boost cylinder 38. A plurality of pressure measuring blades 40 are connected to the rear side of the outer wall of the connecting shaft 39, and the plurality of pressure measuring blades 40 are located at the rear side of the boost cylinder 38 and are rotatably connected to the inside of the air intake pipe 4. The front side of the outer wall of the connecting shaft 39 is connected to the boost spiral blades 41, and the boost spiral blades 41 are rotatably connected to the inside of the boost cylinder 38. In the process of liquefied gas transportation in the air intake pipe 4, the height adjustment tube 31 and the boost cylinder 38 are connected. Hydraulic oil is provided inside, and is interconnected through the return pipe 36 and the boost pipe 37, and the upper end of the height adjustment cylinder 31 is connected with the rear end of the boost cylinder 38 through the return pipe 36, and the lower end of the height adjustment cylinder 31 is connected with the front end of the boost cylinder 38 through the boost pipe 37. When the liquefied gas inside the intake pipe 4 starts to flow, the liquefied gas drives multiple pressure measuring blades 40 to rotate inside the intake pipe 4, and drives the connecting shaft 39 and the boosting spiral blades 41 to rotate through multiple pressure measuring blades 40. At this time, the boosting spiral blades 41 push the hydraulic oil inside the boost cylinder 38 forward through rotation, allowing the hydraulic oil inside the front end of the boost cylinder 38 to enter the lower end of the height adjustment cylinder 31 through the boost pipe 37, thereby increasing the oil pressure inside the lower end of the height adjustment cylinder 31. The oil pressure pushes the drive ring 32 upward and compresses the height adjustment spring 34. At the same time, the multiple pressure relief holes 33 relieve the pressure of the hydraulic oil. When the pressure of the hydraulic oil pushing up the drive ring 32 is balanced with the elastic force of the height adjustment spring 34, the drive ring 32 stops moving up and flows to the interior of the upper end of the height adjustment cylinder 31 through the multiple pressure relief holes 33. Finally, it flows back to the inside of the boost cylinder 38 through the return pipe 36, allowing the hydraulic oil to circulate between the height adjustment cylinder 31 and the boost cylinder 38. Since the drive ring 32 is connected to the feedback link 26, the drive ring 32 will drive the feedback link 26 to move upward together, so that the flow rate inside the intake pipe 4 is converted into the height of the up and down movement of the overcurrent protection component through the flow measurement feedback component, thereby realizing the driving of the overcurrent protection component by the flow measurement feedback component.The height of the over-current protection component moving up and down can be controlled according to the flow rate of the liquefied gas in the air intake pipe 4.

[0037] Among them, when the flow rate inside the intake pipe 4 does not reach the safety threshold, the rotation speed of the multiple pressure measuring blades 40 is low, the pushing force of the booster spiral blades 41 on the hydraulic oil is small, and the increased oil pressure inside the lower end of the height adjustment cylinder 31 pushes the drive ring 32 too high, which is not enough to drive the blocking head 21 of the overcurrent protection component to move to the blocking hole 20 position, and only moves on the lower side of the blocking hole 20. The intake pipe 4 remains unobstructed and the liquefied gas is transported normally. When the flow rate inside the intake pipe 4 reaches the safety threshold, the flow inside the intake pipe 4 suddenly increases, and The safety threshold is reached quickly. At this time, the rotation speed of the multiple pressure measuring blades 40 is relatively fast, and the boosting spiral blades 41 have a relatively large pushing force on the hydraulic oil. The increased oil pressure inside the lower end of the height adjustment cylinder 31 lifts the driving ring 32 to a height sufficient to drive the sealing head 21 of the flow protection component to move to the position of the sealing hole 20, so that the sealing head 21 is stuck in the sealing hole 20 to seal the air intake pipe 4, thereby blocking the transportation of liquefied gas and playing a protective role. When the sealing head 21 is returned to its original position, the feedback connecting rod 26 is driven to rotate by turning the return knob 35.

[0038] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A liquefied gas cylinder pressure regulating valve with a protective structure, characterized in that: The invention comprises a lower valve cover (1), wherein the front end of the lower valve cover (1) is connected to an air outlet pipe (2), the front end of the air outlet pipe (2) is connected to an air outlet connector (3), the rear end of the lower valve cover (1) is connected to an air inlet pipe (4), the rear end of the air inlet pipe (4) is connected to an air inlet connector (5), the rear end of the air inlet pipe (4) is externally sleeved with a connecting threaded pipe sleeve (6), and the connecting threaded pipe sleeve (6) is located at the front end of the air inlet connector (5), the upper end of the lower valve cover (1) is provided with a pressure regulating diaphragm (7), the upper end of the pressure regulating diaphragm (7) is provided with an upper valve cover (8), and the upper valve cover (8) is connected to the lower valve cover (1) by screws, and there are screws between the pressure regulating diaphragm (7), the lower valve cover (1) and the upper valve cover (8). A sealing gasket is provided at the center of the upper end of the pressure regulating diaphragm (7), and the pressure regulating spring (9) is located inside the upper valve cover (8) and is elastically connected between the pressure regulating diaphragm (7) and the upper valve cover (8). The front side of the left end of the intake pipe (4) is connected to a pressure gauge (10) through a pressure measuring tube. A pressure regulating feedback component is provided inside the rear end of the lower valve cover (1), and the pressure regulating feedback component is provided between the intake pipe (4) and the pressure regulating diaphragm (7). An overflow protection component is provided inside the intake pipe (4), and the overflow protection component is located at the rear side of the connection between the pressure measuring tube and the intake pipe (4). A flow measurement feedback component is connected to the rear side of the overflow protection component, and the flow measurement feedback component is located inside the rear end of the intake pipe (4).

2. A liquefied gas cylinder pressure regulating valve with a protective structure as claimed in claim 1, characterized in that: The pressure regulating feedback assembly includes a front pressure regulating lever (12), a rear pressure regulating lever (13), a flow control pipe head (15) and a flow control pipe sleeve (18); the center of the lower end of the pressure regulating diaphragm (7) is connected to a pressure regulating connecting rod (11); the rear side of the lower end of the pressure regulating connecting rod (11) is rotatably connected to the front pressure regulating lever (12); the rear end of the front pressure regulating lever (12) is sleeved with the rear pressure regulating lever (13), and the front pressure regulating lever (12) is inserted into the front end of the rear pressure regulating lever (13) and is slidably connected to the rear pressure regulating lever (13); the front sides of the left and right ends of the rear pressure regulating lever (13) are rotatably connected to support rods (14) through pressure regulating shafts, and the two support rods (14) are fixedly connected to the inner wall of the lower end of the lower valve cover (1).

3. A liquefied gas cylinder pressure regulating valve with a protective structure as claimed in claim 2, characterized in that: The rear side of the lower end of the rear pressure regulating lever (13) is connected to an arc-shaped flow control pipe head (15), the flow control pipe head (15) opens downward, and a plurality of flow control grooves (16) are provided on the outer wall of the flow control pipe head (15), and is connected to the interior of the lower valve cover (1) through the flow control grooves (16). The rear end of the lower valve cover (1) is connected to a connecting pipe (17), and the rear end of the connecting pipe (17) is connected to the intake pipe (4). The front side of the upper end of the connecting pipe (17) is connected to an arc-shaped flow control pipe sleeve (18), and the flow control pipe head (15) is slidably connected to the interior of the flow control pipe sleeve (18).

4. A liquefied gas cylinder pressure regulating valve with a protective structure as claimed in claim 1, characterized in that: The over-current protection component comprises a blocking baffle (19), a blocking hole (20) and a blocking head (21); a blocking baffle (19) is provided inside the front end of the air inlet pipe (4), and the blocking baffle (19) is located at the rear side of the connection between the pressure measuring tube and the air inlet pipe (4); a blocking hole (20) is provided on the upper side of the rear end of the pressure gauge (10); a blocking head (21) is provided on the lower side of the rear end of the blocking baffle (19), and the front end of the blocking head (21) is hemispherical and fits on the outer wall of the rear end of the blocking baffle (19).

5. A liquefied gas cylinder pressure regulating valve with a protective structure as claimed in claim 4, characterized in that: The right side of the rear end of the plugging head (21) is connected to a telescopic slide (22), the rear end of the telescopic slide (22) is connected to a limit baffle (23), the outside of the telescopic slide (22) is sleeved with a limit connection seat (24), and the right end of the limit connection seat (24) is arranged in a plane, and the inside of the limit connection seat (24) is connected to two connecting inner plates (25) arranged symmetrically in the upper and lower directions, and the two connecting inner plates (25) are respectively located on the upper and lower sides of the center of the limit connection seat (24).

6. A liquefied gas cylinder pressure regulating valve with a protective structure as claimed in claim 5, characterized in that: A feedback link (26) is inserted into the interior of the upper end of the limit connection seat (24), and the lower end of the feedback link (26) passes through the interior of the two connection inner plates (25) and is connected to the two connection inner plates (25) through a limit ring. The upper end of the feedback link (26) passes through the interior of the intake pipe (4) and the limit connection seat (24) and extends to the outside of the upper end of the intake pipe (4). The lower side of the outer portion of the feedback link (26) is connected to a return gear (27), and the return gear (27) is rotatably connected between the two connection inner plates (25).

7. A liquefied gas cylinder pressure regulating valve with a protective structure as claimed in claim 6, characterized in that: A return rack (28) is provided at the center of the left end of the telescopic slide (22), and the return gear (27) is meshed with the left end of the return rack (28). A blocking spring (29) is provided between the blocking head (21) and the limit connection seat (24). A limit slide (30) is provided at the right end of the limit connection seat (24), and the limit slide (30) is fixedly connected to the outer wall of the intake pipe (4) and is slidably connected to the plane of the right end of the limit connection seat (24).

8. A liquefied gas cylinder pressure regulating valve with a protective structure as claimed in claim 7, characterized in that: The flow measurement feedback assembly includes a height adjustment cylinder (31), a drive ring (32), a boost cylinder (38), a pressure measurement fan blade (40) and a boost spiral fan blade (41); the front side of the upper end of the intake pipe (4) is connected to the height adjustment cylinder (31); the lower end of the height adjustment cylinder (31) is slidably connected to the drive ring (32), and the drive ring (32) is connected to the outside of the feedback connecting rod (26); and a plurality of pressure relief holes (33) are opened on the inside and outside of the drive ring (32).

9. A liquefied gas cylinder pressure regulating valve with a protective structure as claimed in claim 8, characterized in that: The upper end of the driving ring (32) is provided with a height adjustment spring (34), and is elastically connected to the interior of the height adjustment cylinder (31) through the height adjustment spring (34). The upper end of the height adjustment cylinder (31) is provided with a return knob (35), and the return knob (35) is connected to the top of the feedback connecting rod (26). The upper end of the height adjustment cylinder (31) is connected to a return pipe (36), and the lower end of the height adjustment cylinder (31) is connected to a boost pipe (37). The return pipe (36) and the boost pipe (37) both penetrate the interior of the intake pipe (4) and the outer wall of the height adjustment cylinder (31), and extend to the interior of the intake pipe (4).

10. A liquefied gas cylinder pressure regulating valve with a protective structure as claimed in claim 9, characterized in that: The other ends of the return pipe (36) and the boost pipe (37) are connected to a boost cylinder (38), and the boost cylinder (38) is fixed inside the intake pipe (4) through a connecting rod. The return pipe (36) is connected to the rear end of the boost cylinder (38), and the boost pipe (37) is connected to the front end of the boost cylinder (38). A connecting shaft (39) runs through the rear end of the boost cylinder (38). The rear side of the outer wall of the connecting shaft (39) is connected to a plurality of pressure measuring blades (40), and the plurality of pressure measuring blades (40) are located on the rear side of the boost cylinder (38) and are rotatably connected inside the intake pipe (4). The front side of the outer wall of the connecting shaft (39) is connected to a boost spiral blade (41), and the boost spiral blade (41) is rotatably connected inside the boost cylinder (38).

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