Fuel gas supply adjusting device of dual-fuel diesel engine

Abstract

The invention discloses a fuel gas supply adjusting device of a dual-fuel diesel engine in the technical field of fuel gas supply of diesel engines, which comprises a flow control valve, the flow control valve comprises a valve main body, a gas inlet pipe and a gas outlet pipe respectively arranged at two ends of the valve main body, and a valve rod connected with a valve core in the valve main body, the fuel gas supply adjusting device further comprises a pressure reduction protection mechanism which comprises a cylinder inserted into the gas inlet pipe, a through opening eccentrically formed in the bottom of the cylinder and communicated with the gas inlet pipe, a plate body arranged in the cylinder and used for sealing the through opening, and a rotating rod with one end connected with the plate body and the other end penetrating through the cylinder. And the rotating rod is in transmission connection with the valve rod. The pressure reduction protection mechanism is arranged on the gas inlet pipe, when the valve rod rotates to drive the valve element to move so as to reduce the gas flow, the rotating rod synchronously rotates along with the valve rod, then the plate body is driven to move, the through opening is gradually opened, the upstream pressure is released, and the problem that the upstream pressure is accumulated when the opening degree of a traditional flow valve is reduced is effectively solved.

Description

Technical Field

[0001] The present invention relates to the field of gas supply for diesel engines, and particularly to a gas supply regulating device for a dual-fuel diesel engine. Background Art

[0002] At present, marine dual-fuel diesel engines usually operate in a dual-fuel mode of gas (natural gas) / diesel. Since the demand for gas flow by the engine varies significantly under different load conditions, it is usually necessary to transport the high-pressure gas in the gas storage tank to the engine through a gas pipeline, and precisely control the natural gas flow through a gas supply regulating device during the intake process. Currently, it is usually by installing a flow control valve on the pipeline. The flow control valve is connected to the pipeline at the outlet end of the gas storage tank through a flange structure. Although the flow regulation function can be achieved, there are the following defects in use: when reducing the gas flow through the flow control valve, due to the reduction of the valve core opening degree resulting in the contraction of the flow cross-section, the pressure in front of the valve (upstream) will temporarily rise. In the long term, this periodic pressure shock will easily cause the sealing of the flange connection part upstream to fail, resulting in gas leakage and seriously threatening the safety of ship operation. For this reason, we propose a gas supply regulating device for a dual-fuel diesel engine. Summary of the Invention

[0003] The purpose of the present invention is to provide a gas supply regulating device for a dual-fuel diesel engine, which solves the problem that when the existing flow control valve is used to regulate the gas supply and the gas flow is reduced, due to the reduction of the valve core opening degree resulting in the contraction of the flow cross-section, the pressure in front of the valve (upstream) will temporarily rise, easily causing the sealing of the flange connection part upstream to fail, resulting in gas leakage and seriously threatening the safety of ship operation.

[0004] The present invention achieves the above purpose through the following technical solutions: A gas supply regulating device for a dual-fuel diesel engine includes a flow control valve. The flow control valve includes a valve body, an intake pipe and an outlet pipe respectively arranged at both ends of the valve body, and a valve rod connecting the valve core in the valve body. The intake pipe and the outlet pipe are respectively connected to the pipeline at the outlet end of the gas storage tank main body and the gas flow pipeline through flange parts. The gas supply regulating device further includes a pressure reduction and protection mechanism. The pressure reduction and protection mechanism includes a cylinder inserted into the intake pipe, a through port eccentrically opened at the bottom of the cylinder and communicated with the intake pipe, a plate body arranged on the bottom wall of the cylinder for closing the through port, and a rotating rod with one end connected to the plate body and the other end passing through the cylinder. The rotating rod is in transmission connection with the valve rod, and when the valve rod drives the valve core to reduce the gas flow, the rotating rod synchronously drives the plate body to rotate to adjust the opening area of the through port.

[0005] Further improvement lies in that a movable plate adapted to the cylinder is movably arranged in the cylinder. The movable plate is movably sleeved outside the rotating rod, and the movable plate is connected to the inner wall of the cylinder through an elastic member.

[0006] A further improvement is that the flange member includes two sets of detachably fixedly connected flanges, a sealing ring is provided between the two sets of flanges, a guide seat is provided on one side of the cylinder, a connecting frame driven to rise and fall by a telescopic device is provided in the guide seat, two sets of limit plates are symmetrically provided on both sides of the connecting frame, the two sets of limit plates are connected and fixed by a connecting member, and the two sets of limit plates are respectively located on both sides of the flange member of the air inlet pipe and the air outlet pipe of the gas storage tank body; When the telescopic device drives the connecting frame downward, the connecting frame drives the two sets of limit plates at its end to clamp the outer sides of the flanges at the air inlet pipe and the air outlet end pipeline of the gas storage tank body.

[0007] A further improvement is that a gear ring is embedded on the side of the flange at the end of the air inlet pipe facing the gas tank body. The gear ring is coaxial with the flange and is located outside the sealing ring. The gear ring is provided with several groups of detection sensors for detecting gas, and also includes an alarm. The alarm sounds an alarm when the detection sensor detects gas.

[0008] A further improvement is that the gear ring is connected to the connecting frame via a transmission member, and the transmission member drives the gear ring to rotate when the connecting frame is raised or lowered.

[0009] A further improvement is that the transmission member includes a flange embedded in the end of the intake pipe, facing the side of the gas tank body and meshing with the gear ring. The shaft of the driving gear passes through the flange and is rotatably connected to the guide seat through an elastic reset member. A connecting rope is wound around the shaft of the driving gear, one end of the connecting rope passes through the guide seat and is connected to the connecting frame. The connecting rope drives the driving gear to rotate when the connecting frame moves downward.

[0010] A further improvement is that an expansion airbag seal is provided on the side of the flange at the end of the intake pipe facing the main body of the gas tank, and the expansion airbag seal is located on the outside of the gear ring. The expansion airbag seal is connected to an air cylinder through an air pipe, and the air cylinder is arranged on a connecting frame. A piston rod group is movably inserted at one end of the air cylinder, and a return spring is provided on the outer wall of the piston rod group. When the connecting frame is moved downward, the piston rod group compresses the gas in the air cylinder into the expansion airbag seal, so that the expansion airbag seal expands and seals the flange.

[0011] A further improvement is that both the inner and outer sides of the expansion airbag seal are provided with limiting protruding rings, and the axial length of the limiting protruding rings is smaller than the axial length of the sealing ring.

[0012] Further improvement lies in that a follower plate is sleeved on the outer wall of the rotating rod, a detecting member is arranged on the follower plate, a contacting member corresponding to the detecting member is arranged on the cylinder body. When the detecting member corresponds to the contacting member, the flow control valve is in an unregulated flow state. When the valve rod drives the valve core to rotate to reduce the gas flow, the rotating rod drives the follower plate to separate the detecting member from the contacting member, and then the telescopic device drives the connecting frame to descend.

[0013] Further improvement lies in that a plurality of groups of balls for contacting with the flange member are rotatably embedded on the opposite sides of the two groups of limiting plates.

[0014] The beneficial effects of the present invention are as follows: The present invention is provided with a step-down protection mechanism on the intake pipe. When the valve rod rotates to drive the valve core to move to reduce the gas flow, the rotating rod rotates synchronously with the valve rod, and then drives the plate body to move to gradually open the through port, so that the gas can enter the cylinder body through the opened through port, releasing the upstream pressure, effectively solving the problem of upstream pressure accumulation when the traditional flow valve reduces the opening degree, and greatly reducing the probability of damage to the flange members at the upstream intake pipe and the outlet pipeline of the gas storage tank main body due to periodic pressure shocks, resulting in gas leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of the gas supply adjustment device of the present invention; Figure 2 is of the present invention Figure 1 is a partial structural diagram; Figure 3 is a schematic cross-sectional structure diagram of the cylinder body in the step-down protection mechanism of the present invention; Figure 4 is a schematic structural diagram of the step-down protection mechanism in the gas supply adjustment device of the present invention; Figure 5 is a schematic structural diagram of the flange plate in the gas supply adjustment device of the present invention.

[0016] In the figure: 100, gas storage tank main body; 200, valve main body; 201, valve rod; 300, gas flow pipeline; 400, flange plate; 500, sealing ring; 600, step-down protection mechanism; 601, cylinder body; 602, rotating rod; 603, connecting pull rope; 604, through port; 605, plate body; 606, movable plate; 607, elastic member; 608, guiding seat; 609, connecting frame; 610, limiting plate; 611, ball; 612, connecting member; 613, telescopic device; 614, follower plate; 615, toothed ring; 616, expansion airbag seal; 617, limiting convex ring; 618, air pipe; 619, gas storage cylinder; 620, detection sensor. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The present application is described in further detail below in conjunction with the accompanying drawings. It is necessary to point out that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technicians in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0018] Example 1 Please see the attached Figures 1-4 A gas supply regulating device for a dual-fuel diesel engine, comprising a flow control valve connecting a gas storage tank body 100 and a gas flow line 300, the gas flow line 300 being connected to a gas filter, a gas mixer, etc., and finally to the dual-fuel diesel engine, which will not be described in detail herein; The flow control valve includes a valve body 200, an air inlet pipe and an air outlet pipe respectively provided at both ends of the valve body 200, and a valve stem 201 connected to the valve core in the valve body 200. The flow control valve is a conventional structure in the art. The valve stem 201 can be driven to rotate by an electrical device such as a motor, or can be configured with a handwheel for manual adjustment. The flow control valve is a conventional structure in the art and is not limited to the above structures, and will not be described in detail here. The air inlet pipe and the air outlet pipe are respectively connected to the air outlet pipe of the gas storage tank body 100 and the gas flow pipe 300 through flanges. The flanges include two sets of detachable and fixedly connected flanges 400. A sealing ring 500 is provided between the two sets of flanges 400. Specifically, flanges 400 are provided at the ends of the air inlet pipe, the end of the air outlet pipe, the air outlet pipe of the gas storage tank body 100, and the end of the gas flow pipe 300. The two adjacent sets of flanges 400 can be fixedly connected by a bolt-like structure, for example. The sealing ring 500 is embedded between the two adjacent sets of flanges 400 to improve the sealing between the two adjacent sets of flanges 400. This method is a common flange connection method for pipelines in this field and will not be described in detail here. The gas supply regulating device further includes a pressure reduction protection mechanism 600, which includes a cylinder 601 inserted into the air inlet pipe, a through-port 604 eccentrically provided at the bottom of the cylinder 601 and connected to the air inlet pipe, preferably two groups of through-ports 604, respectively provided on both sides of the bottom of the cylinder 601, a plate 605 provided on the bottom wall of the cylinder 601 for closing the through-port 604, and a rotating rod 602 having one end connected to the plate 605 and the other end passing through the cylinder 601, the rotating rod 602 being transmission-connected to the valve stem 201, and the rotating rod 602 and the valve stem 201 being transmission-connected, for example, by a sprocket transmission group (including a sprocket and a chain), and when the valve stem 201 drives the valve core to reduce the gas flow, the rotating rod 602 synchronously drives the plate 605 to rotate and adjust the opening area of the through-port 604; When the flow control valve does not adjust the gas supply flow rate, the plate body 605 closes the through port 604, and gas cannot enter the cylinder body 601 through the through port 604. When the valve stem 201 rotates to drive the valve core to move and reduce the gas flow rate, the rotating rod 602 rotates with the valve stem 201. Further, the rotating rod 602 drives the plate body 605 to open the through port 604. The smaller the gas flow rate is adjusted, the larger the rotation angle of the valve stem 201 is. Similarly, the rotating rod 602 drives the plate body 605 to make the opening area of the through port 604 larger. This method effectively solves the problem of upstream pressure accumulation when the traditional flow valve reduces the opening degree, and greatly reduces the probability of gas leakage caused by damage (such as bolt stress relaxation, damage to the sealing ring 500, etc.) of the flange parts at the upstream intake pipe and the outlet pipeline of the gas storage tank body 100 due to periodic pressure shocks.

[0019] Preferably, a movable plate 606 adapted thereto is movably provided in the cylinder body 601 of this embodiment. The movable plate 606 is movably sleeved outside the rotating rod 602, and the movable plate 606 is connected to the inner wall of the top of the cylinder body 601 through an elastic member 607. The elastic member 607 is, for example, a spring, etc. When the through port 604 is opened, part of the gas can enter the cylinder body 601 through the through port 604, and then drive the movable plate 606 to move upward to compress the elastic member 607, releasing the upstream pressure. When the pressure returns to normal, the elastic member 607 drives the movable plate 606 to reset, and then the gas in the cylinder body 601 returns to the intake pipe again.

[0020] Embodiment 2 Please refer to the attached Figures 1-5 , on the basis of Embodiment 1, a guide seat 608 is provided on one side of the cylinder body 601 of this embodiment. The guide seat 608 is a vertical frame structure. A connecting frame 609 driven by a telescopic device 613 (such as an electric telescopic rod) to lift and lower is provided in the guide seat 608. Two groups of limiting plates 610 are symmetrically arranged on both sides of the connecting frame 609. There are a total of four limiting plates 610, which are symmetrically arranged in pairs. The two groups of limiting plates 610 are connected and fixed through a connecting member 612. The connecting member 612 is, for example, an adjustable telescopic rod, etc. The two groups of limiting plates 610 are respectively located on both sides of the flange parts of the intake pipe and the outlet pipeline of the gas storage tank body 100; When the telescopic device 613 drives the connecting frame 609 downward, the connecting frame 609 drives the two groups of limiting plates 610 at its end to clamp outside the flange parts at the intake pipe and the outlet pipeline of the gas storage tank body 100. The two flange plates 400 in the flange parts can be fixed through the limiting plates 610, so that the two flange plates 400 are not easily affected by pressure and move and separate during the adjustment of the flow control valve, ensuring the connection stability of the two flange plates 400, and also making the bolt-like structures for fixing the two flange plates 400 not easily loosen.

[0021] Preferably, the two sets of limiting plates 610 in this embodiment are rotatably embedded with several sets of balls 611 for contacting the flange parts on the opposite sides. The balls 611 can be rubber balls to reduce the damage to the flange 400 caused by contact with the flange 400, and at the same time facilitate the limiting plates 610 to clamp the flange parts to limit them.

[0022] Preferably, the outer wall of the rotating rod 602 of this embodiment is provided with a follower plate 614, the follower plate 614 is provided with a detection member, and the cylinder 601 is provided with a contact member corresponding to the detection member. The above-mentioned detection member is, for example, a Hall sensor, and the contact member is a permanent magnet. Alternatively, the detection member is a photoelectric switch, and the contact member is a reflective identification sheet. Of course, it is not limited to the above structures. When the detection member corresponds to the contact member, the flow control valve is in an unregulated flow state, that is, the gas is supplied at a normal flow rate. When the valve stem 201 drives the valve core to rotate to reduce the gas flow, the rotating rod 602 drives the follower plate 614 to separate the detection member from the contact member, and then the telescopic device 613 drives the connecting frame 609 to descend. The detection member and the telescopic device 613 are both electrically connected to the external controller. When the detection member is separated from the contact member, the detection member sends a signal to the external controller, and the external controller controls the telescopic device 613 to drive the connecting frame 609 to descend. When the detection member and the contact member correspond again, the external controller controls the telescopic device 613 to drive the connecting frame 609 to rise and reset.

[0023] Example 3 Please see the attached Figures 3-5 On the basis of Example 2, a gear ring 615 is embedded in the flange 400 at the end of the air inlet pipe facing the gas tank body 100 of this embodiment. Specifically, an annular groove is formed on the side of the flange 400 at the end of the air inlet pipe facing the gas tank body 100. The gear ring 615 is rotatably arranged in the annular groove through a bearing. The gear ring 615 is coaxial with the flange 400 and is located outside the sealing ring 500. The gear ring 615 is provided with a plurality of groups of detection sensors 620 for detecting gas. The detection sensors 620 are, for example, gas detection sensors, etc., and also include an alarm. The alarm sounds an alarm when the detection sensor 620 detects gas. Specifically, the detection sensor 620 and the alarm are both electrically connected to an external controller. When the detection sensor 620 detects gas, it indicates that the flange parts at the air inlet pipe and the gas outlet pipe of the gas tank body are leaking gas, and then a signal is sent to the external controller. The external controller controls the alarm to alert the user.

[0024] Preferably, the gear ring 615 of this embodiment is connected to the connecting frame 609 via a transmission member, and the transmission member drives the gear ring 615 to rotate when the connecting frame 609 is raised or lowered; Preferably, the transmission member in this embodiment includes a driving gear that is embedded in the end of the intake pipe and meshes with the toothed ring 615 on the side facing the gas storage tank body 100. The shaft of the driving gear penetrates through the flange 400 and is rotatably connected to the guiding seat 608 through an elastic reset member (such as a torsion spring). A connecting pull rope 603 is wound around the shaft of the driving gear. One end of the connecting pull rope 603 penetrates through the guiding seat 608 and then connects to the connecting frame 609. Specifically, the connecting pull rope 603 extends to the top of one side of the guiding seat 608 and then penetrates through its outer wall to connect to the connecting frame 609. When the connecting frame 609 moves downward, the connecting pull rope 603 drives the driving gear to rotate; When adjusting the flow control valve to reduce the gas flow rate, the telescopic device 613 will drive the connecting frame 609 to move downward, and then pull the shaft of the driving gear to rotate through the connecting pull rope 603. The shaft drives the driving gear, and then the driving gear drives the toothed ring 615 to rotate. When the flow control valve is reset to the initial state, the telescopic device 613 will drive the connecting frame 609 to move upward and reset. Then the elastic reset member drives the shaft, the shaft drives the driving gear, and then the driving gear drives the toothed ring 615 to rotate and reset. When the toothed ring 615 rotates, it drives the detection sensor 620, effectively improving the gas detection range of the detection sensor 620 for the flange member.

[0025] Embodiment 4 Please refer to the appendix Figures 3-5 On the basis of Embodiment 3, an expansion airbag seal 616 is further provided on the side of the flange 400 at the end of the intake pipe facing the gas storage tank body 100. The expansion airbag seal 616 is, for example, a rubber airbag ring. The expansion airbag seal 616 is located outside the toothed ring 615. The expansion airbag seal 616 is communicated with a gas storage cylinder 619 through a trachea 618. The gas storage cylinder 619 stores gas. The gas storage cylinder 619 is provided on the connecting frame 609. A piston rod group is movably inserted at one end of the gas storage cylinder 619. The piston rod group includes a piston that can move in the gas storage cylinder 619 and a piston rod connecting the piston. A return spring is sleeved on the outer wall of the piston rod group. Specifically, one end of the return spring is connected to the end of the piston rod, and the other end is connected to the outer wall of the gas storage cylinder 619; When the telescopic device 613 drives the connecting frame 609 to move downward, the piston rod group contacts the outer wall of the intake pipe (or the bottom wall of the guide seat 608). As the connecting frame 609 continues to move downward, the piston rod group squeezes the air in the air storage cylinder 619, causing the air in the air storage cylinder 619 to enter the expansion airbag seal 616. The expansion airbag seal 616 expands and contacts the other flange 400, forming a second auxiliary sealing structure on the outside between the adjacent two flanges 400. On the one hand, it effectively avoids the situation that the sealing ring 500 is damaged under the influence of pressure when the flow control valve adjusts to reduce the gas flow, resulting in direct gas leakage to the outside. On the other hand, after the expansion airbag seal 616 expands, the detection sensor 620 is located between the sealing ring 500 and the expansion airbag seal 616, facilitating the detection sensor 620 to better detect whether there is gas leakage in the flange part.

[0026] Preferably, limiting convex rings 617 are provided on both the inner side and the outer side of the expansion airbag seal 616 in this embodiment. The thickness of the limiting convex ring 617 is less than the thickness of the sealing ring 500. The setting of the limiting convex blocks restricts the expansion of the expansion airbag seal 616 along its axial direction when gas enters the expansion airbag seal 616.

[0027] The above embodiments only represent several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A gas supply regulating device for a dual-fuel diesel engine, comprising a flow control valve. The flow control valve includes a valve body (200), an intake pipe and an outlet pipe respectively provided at both ends of the valve body (200), and a valve rod (201) connecting the valve core in the valve body (200). The intake pipe and the outlet pipe are respectively connected to the gas outlet pipe of the gas storage tank main body (100) and the gas flow pipe (300) through flange members, and is characterized in that: The gas supply regulating device further comprises a pressure reduction protection mechanism (600), the pressure reduction protection mechanism (600) comprising a cylinder (601) inserted into the air inlet pipe, a through-port (604) eccentrically provided at the bottom of the cylinder (601) and communicating with the air inlet pipe, a plate (605) provided on the bottom wall of the cylinder (601) for closing the through-port (604), and a rotating rod (602) having one end connected to the plate (605) and the other end passing through the cylinder (601), the rotating rod (602) being transmission-connected to the valve stem (201), and the rotating rod (602) synchronously driving the plate (605) to rotate and adjust the opening area of the through-port (604) when the valve stem (201) drives the valve core to reduce the gas flow rate.

2. The gas supply regulating device according to claim 1, characterized in that: A matching movable plate (606) is movably provided in the cylinder (601), and the movable plate (606) is movably sleeved on the outside of the rotating rod (602), and the movable plate (606) is connected to the inner wall of the cylinder (601) through an elastic member (607).

3. The gas supply regulating device according to claim 1, characterized in that: The flange member comprises two groups of detachably fixedly connected flanges (400), a sealing ring (500) is provided between the two groups of flanges (400), a guide seat (608) is provided on one side of the cylinder (601), a connecting frame (609) driven to rise and fall by a telescopic device (613) is provided in the guide seat (608), two groups of limit plates (610) are symmetrically provided on both sides of the connecting frame (609), the two groups of limit plates (610) are connected and fixed by a connecting member (612), and the two groups of limit plates (610) are respectively located on both sides of the flange member of the air inlet pipe and the air outlet pipe of the gas storage tank body (100); When the telescopic device (613) drives the connecting frame (609) downward, the connecting frame (609) drives the two sets of limiting plates (610) at its end to clamp the outer sides of the flanges at the air inlet pipe and the air outlet end pipeline of the gas storage tank body (100).

4. The gas supply regulating device according to claim 3, characterized in that: A gear ring (615) is embedded in the flange (400) at the end of the air inlet pipe on the side facing the gas storage tank body (100). The gear ring (615) is coaxial with the flange (400) and is located outside the sealing ring (500). The gear ring (615) is provided with a plurality of detection sensors (620) for detecting gas, and also includes an alarm. The alarm is activated when the detection sensor (620) detects gas.

5. The gas supply regulating device according to claim 4, characterized in that: The gear ring (615) is connected to the connecting frame (609) through a transmission member, and the transmission member drives the gear ring (615) to rotate when the connecting frame (609) is raised or lowered.

6. The gas supply regulating device according to claim 5, characterized in that: The transmission member includes a flange (400) embedded in the end of the air inlet pipe, facing the side of the gas tank body (100) and meshing with the gear ring (615); the shaft of the driving gear passes through the flange (400) and is rotatably connected to the guide seat (608) through an elastic reset member; a connecting rope (603) is wound around the shaft of the driving gear, one end of the connecting rope (603) passes through the guide seat (608) and is connected to the connecting frame (609); the connecting rope (603) drives the driving gear to rotate when the connecting frame (609) moves downward.

7. The gas supply regulating device according to claim 4, characterized in that: On the side of the flange (400) at the end of the intake pipe facing the gas storage tank body (100), there is also an expansion airbag seal (616). The expansion airbag seal (616) is located outside the toothed ring (615). The expansion airbag seal (616) is connected to an air storage cylinder (619) through an air pipe (618). The air storage cylinder (619) is arranged on the connecting frame (609). One end of the air storage cylinder (619) is movably inserted with a piston rod group, and a return spring is sleeved on the outer wall of the piston rod group. When the connecting frame (609) moves downward, the piston rod group compresses the gas in the air storage cylinder (619) into the expansion airbag seal (616), causing the expansion airbag seal (616) to expand and seal the flange.

8. The gas supply regulating device according to claim 7, wherein: On both the inner and outer sides of the expansion airbag seal (616), there are also limit convex rings (617). The axial length of the limit convex ring (617) is less than the axial length of the sealing ring (500).

9. The gas supply regulating device according to claim 3, wherein: A follower plate (614) is sleeved on the outer wall of the rotating rod (602). A detection member is provided on the follower plate (614), and a contact member corresponding to the detection member is provided on the cylinder body (601). When the detection member corresponds to the contact member, the flow control valve is in the state of not adjusting the flow rate. When the rotating rod (602) drives the valve core to rotate to reduce the gas flow rate driven by the valve rod (201), the rotating rod (602) drives the follower plate (614) to separate the detection member from the contact member, and then the telescopic device (613) drives the connecting frame (609) to descend.

10. The gas supply regulating device according to claim 3, characterized in that: On the opposite sides of the two groups of limit plates (610), a number of groups of balls (611) for contacting the flange are rotatably embedded.

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