High-pressure gas multi-connected pressure reduction module

Abstract

The invention discloses a high-pressure gas multi-union pressure reduction module which comprises a gas inlet main pipe, a plurality of pressure reduction pipelines arranged in parallel are arranged on the gas inlet main pipe, and bypass stop valves are connected between the gas outlet ends of the pressure reduction pipelines; the pressure reducing pipeline comprises a pressure reducing branch pipe connected with the air inlet main pipe, an air inlet stop valve, an air inlet pressure gauge, a pressure reducing valve, an air outlet pressure gauge and an air outlet stop valve are sequentially installed on the pressure reducing branch pipe according to the air passing sequence, and the outer end of the air outlet stop valve is connected with an inflation air channel; a plurality of air inlet branch pipes are arranged on the air inlet main pipe, and a switch valve and a filter are arranged on each air inlet branch pipe; according to the invention, the pressure reducing pipeline is communicated with the inflating gas path of the pressure reducing pipeline on the side to balance the pressure, so that the air outlet pressure is within a set range.

Description

Technical Field

[0001] The present invention relates to the technical field related to gas decompression, and in particular to a high-pressure gas multi-connected decompression module. Background Art

[0002] For high-pressure gas with an inlet pressure of about 3-20MPa, it is usually necessary to reduce it to a working pressure of 0.5-15kPa through a pressure reducing valve group. The common pressure reducing devices at present are: first, the input pressure before pressure reduction is not high, or the input pressure is high, and two-stage pressure reduction is required to reduce it to the required pressure. This device can reduce the pressure of 40MPa high-pressure gas to 0~5MPa through one-stage pressure reduction; second, during the pressure reduction process, the output pressure after pressure reduction is greatly affected by the input pressure. Summary of the Invention

[0003] In order to solve the defects of the prior art, the present invention provides a high-pressure gas multi-connected pressure reducing module.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: The present invention provides a high-pressure gas multi-connected pressure reducing module, comprising an air inlet main pipe, on which a plurality of pressure reducing pipelines arranged in parallel are provided, and a bypass stop valve is connected between the outlet ends of the pressure reducing pipelines; The pressure reducing pipeline includes a pressure reducing branch pipe connected to the air inlet main pipe, and the pressure reducing branch pipe is installed with an air inlet stop valve, an air inlet pressure gauge, a pressure reducing valve, an air outlet pressure gauge, and an air outlet stop valve in the order of gas passing through, and the outer end of the air outlet stop valve is connected to the inflation air circuit; The air intake main pipe is provided with a plurality of air intake branches, each of which is provided with an on-off valve and a filter; It also includes a PLC controller, and the air inlet stop valve, air inlet pressure gauge, pressure reducing valve, air outlet pressure gauge, air outlet stop valve and switch valve are all connected to the PLC controller.

[0005] As a preferred technical solution of the present invention, there are no less than 6 groups of pressure reducing pipelines.

[0006] As a preferred technical solution of the present invention, there are no less than three intake branch pipes.

[0007] As a preferred technical solution of the present invention, a one-way air intake valve is provided on the air intake branch pipe.

[0008] As a preferred technical solution of the present invention, the pressure reducing branch pipe is provided with a safety valve between the outlet pressure gauge and the outlet stop valve.

[0009] As a preferred technical solution of the present invention, the working method of the multi-connected pressure reducing module is as follows: first, air is supplied to the air intake main pipe through the air intake branch pipe, and then the air intake stop valve and the air outlet stop valve on the corresponding pressure reducing pipeline are controlled to open, and then the high-pressure gas flows through the pressure reducing valve to reduce the pressure, and the air intake pressure is detected by the air intake pressure gauge, and then the gas pressure after the pressure reduction by the pressure reducing valve is detected by the air outlet pressure gauge. According to the pressure detection result of the air outlet pressure gauge, the PLC controller controls the bypass stop valve connected to the pressure reducing pipeline to connect the pressure reducing pipeline with the inflation gas path of the side pressure reducing pipeline to balance the pressure so that the outlet pressure is within the set range.

[0010] As a preferred technical solution of the present invention, the pressure reducing valve includes a valve body, and one side of the valve body is provided with an input port for inputting high-pressure gas into the valve body, and one side of the valve body is provided with an output port for outputting the gas after the pressure reduction through the valve body to the outside; The interior of the pressure reducing valve body is provided with a valve plate which divides the valve cavity inside the valve body into two independent cavities, and the valve plate is provided with a channel through which gas flows, wherein the valve body is installed with a valve core for opening and closing the channel, and the bottom of the valve core and the bottom of the valve body are provided with an energy absorbing mechanism for absorbing energy of instantaneous impact of the valve core, and the upper part of the valve body is provided with a pilot valve, and the bottom of the valve core is provided with a valve stem for extending into the pilot valve, and the pilot valve is used to manipulate the valve stem to move up and down.

[0011] As a preferred technical solution of the present invention, the energy absorption mechanism is arranged in the outer cylinder, and the inner cylinder is provided inside the outer cylinder, and a cavity is formed between the outer cylinder and the inner cylinder, and a piston rod that moves along the inner cylinder is provided inside the inner cylinder, and a damping hole is provided on the outer wall of the inner cylinder, and the gaps between the inner cylinder and the outer cylinder are filled with hydraulic oil, and a spring is provided between the piston rod and the bottom side of the inner cylinder.

[0012] As a preferred technical solution of the present invention, the top end of the piston rod is provided with a connecting rod that is vertically upward and has a diameter smaller than the piston rod, and the bottom of the connecting rod is fixedly connected to the valve core, and a sealing layer is provided on the outer wall of the piston rod for sealing the connection between the piston rod and the inner cylinder.

[0013] The beneficial effects of the present invention are: 1. This high-pressure gas multi-connected pressure reducing module intakes air to the air intake main pipe through the air intake branch pipe, and then controls the air intake stop valve and the air outlet stop valve on the corresponding pressure reducing pipeline to open. Then the high-pressure gas flows through the pressure reducing valve to reduce the pressure. The air intake pressure is detected by the air intake pressure gauge, and then the gas pressure after the pressure reduction by the pressure reducing valve is detected by the air outlet pressure gauge. According to the pressure detection result of the air outlet pressure gauge, the PLC controller controls the bypass stop valve connected to the pressure reducing pipeline to connect the pressure reducing pipeline with the inflation gas path of the pressure reducing pipeline on the side to balance the pressure so that the outlet pressure is within the set range. The pressure can be adjusted by on-off regulation of each pressure reducing pipeline, thereby playing the role of multi-connected pressure reduction.

[0014] 2. This high-pressure gas multi-connected pressure reducing module is provided with a specific pressure reducing valve. The bottom of the valve core and the bottom of the valve body are provided with an energy absorbing mechanism for absorbing energy of the instantaneous impact of the valve core, and the upper part of the valve body is provided with a pilot valve, and the bottom of the valve core is provided with a valve stem for extending into the pilot valve, and the pilot valve is used to manipulate the valve stem (1) to move up and down, the energy absorbing mechanism is provided in the outer cylinder, and the inner cylinder is provided with an inner cylinder inside the outer cylinder, and a cavity is formed between the outer cylinder and the inner cylinder, and a piston rod moving along the inner cylinder is provided inside the inner cylinder, and a damping hole is provided on the outer wall of the inner cylinder, and the gaps between the inner cylinder and the outer cylinder are filled with hydraulic oil, and a spring is provided between the piston rod and the bottom side of the inner cylinder; the bottom of the valve core and the bottom of the valve body of the present invention are provided with an energy absorbing mechanism for absorbing energy of the instantaneous impact of the valve core, so that when the pressure fluctuates during instant opening and closing, the valve core will not move up and down, resulting in a large pressure fluctuation amplitude. When the valve core is subjected to instantaneous impact, a hydraulic buffer mechanism is formed between the outer cylinder and the inner cylinder, and hydraulic damping is used to absorb the instantaneous impact, thereby preventing the valve core from moving up and down, and at the same time does not affect the future adjustment of the valve body. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 This is a structural diagram of a high-pressure gas multi-connected pressure reducing module of the present invention; Figure 2 This is a schematic diagram of a single-circuit operation of a high-pressure gas multi-connected pressure reducing module of the present invention; Figure 3 This is a schematic diagram of the dual-path operation of a high-pressure gas multi-connected pressure reducing module of the present invention; Figure 4 This is a schematic diagram of multiple gas path outputs of a high-pressure gas multi-connected pressure reducing module of the present invention; Figure 5This is a schematic diagram of the structure of a pressure reducing valve of a high-pressure gas multi-connected pressure reducing module of the present invention; Figure 6 This is a schematic diagram of the opening of a pressure reducing valve of a high-pressure gas multi-connected pressure reducing module of the present invention; Figure 7 It is a structural schematic diagram of an energy absorption mechanism of a high-pressure gas multi-connected decompression module of the present invention.

[0016] In the figure: 1. Inlet main pipe; 2. Pressure reducing pipe; 3. Bypass stop valve; 4. Pressure reducing branch pipe; 5. Inlet stop valve; 6. Inlet pressure gauge; 7. Pressure reducing valve; 8. Outlet pressure gauge; 9. Outlet stop valve; 10. Charging air circuit; 11. Inlet branch pipe; 12. On-off valve; 13. Filter; 15. One-way inlet valve; 16. Safety valve; 19. Valve body; 20. Input port; 21. Output port; 22. Valve plate; 23. Channel; 24. Valve core; 25. Energy absorbing mechanism; 26. Pilot valve; 27. Valve stem; 28. Outer cylinder; 29. ​​Inner cylinder; 30. Cavity; 31. Piston rod; 32. Damping hole; 33. Spring; 34. Connecting rod; 35. Connecting rod. DETAILED DESCRIPTION

[0017] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0018] Example: Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, the present invention provides a high-pressure gas multi-connected pressure reducing module, comprising an air intake main pipe 1, on which a plurality of pressure reducing pipelines 2 arranged in parallel are provided, and a bypass stop valve 3 is connected between the outlet ends of the pressure reducing pipelines 2; the pressure reducing pipeline 2 comprises a pressure reducing branch pipe 4 connected to the air intake main pipe 1, and the pressure reducing branch pipe 4 is sequentially installed with an air intake stop valve 5, an air intake pressure gauge 6, a pressure reducing valve 7, an air outlet pressure gauge 8, and an air outlet stop valve 9 in the order in which the gases pass through, and the outer end of the air outlet stop valve 9 is connected to an air charging gas circuit 10; the air intake main pipe 1 is provided with a plurality of air intake branch pipes 11, and each air intake branch pipe 11 is provided with a switch valve 12 and a filter 13; The multi-connected pressure reducing module further comprises a PLC controller, and the air intake shut-off valve 5, air intake pressure gauge 6, pressure reducing valve 7, air outlet pressure gauge 8, air outlet shut-off valve 9 and switch valve 12 are all connected to the PLC controller. The working method of the multi-connected pressure reducing module is as follows: first, air is supplied to the air intake main pipe 1 through the air intake branch pipe 11, and then the air intake shut-off valve 5 and the air outlet shut-off valve 9 on the corresponding pressure reducing pipeline 2 are controlled to be open, and then the high-pressure gas flows through the pressure reducing valve 7 to reduce the pressure, and the air intake pressure is detected by the air intake pressure gauge 6, and then the gas pressure after the pressure reduction by the pressure reducing valve 7 is detected by the air outlet pressure gauge 8. According to the pressure detection result of the air outlet pressure gauge 8, the PLC controller controls the bypass shut-off valve 3 connected to the pressure reducing pipeline 2 to connect the pressure reducing pipeline 2 with the inflation gas path 10 of the pressure reducing pipeline 2 on the side, and performs pressure balance so that the outlet pressure is within the set range.

[0019] There are no less than 6 groups of pressure reducing pipelines 2. In this way, multiple pressure reducing pipelines 2 are set up, and the pressure reducing pipelines 2 are connected to the inflation gas path of the pressure reducing pipelines 2 next to them for pressure balance, so that the outlet pressure is within the set range, and multiple devices can be inflated at the same time.

[0020] like Figure 2 As shown, the single-channel operating principle is to output the required pressure gas to the equipment on gas line 1 through gas line 1. Before operation, check that the inlet, outlet, and bypass stop valves of each gas line are closed. Connect the air inlet (inlet 1) of the pressure reducing module to the external gas source via a pipeline, and connect the air outlet of the pressure reducing module to the air inlet of the equipment that needs to be inflated. Plug the remaining unused air inlets. During operation, open the inlet stop valve (gas line 1) and outlet stop valve (gas line 1), adjust the pressure reducing valve (gas line 1), and observe the reading of the outlet pressure gauge (gas line 1) until the reading reaches the required pressure value. At this time, the output pressure of gas line 1 is the adjusted pressure, and the multi-channel output is completed.

[0021] like Figure 3 As shown, the required pressure gas is delivered from the air inlet through air lines 1 and 2 to the equipment on branches 1 and 2. Before operation, check that the inlet, outlet, and bypass stop valves of each air line are closed. Connect the air inlet (inlet 1) of the pressure reducing module to the external air source through a pipeline, and connect the air outlet of the pressure reducing module to the air inlet of the equipment that needs to be inflated. Plug the remaining unused air inlets with plugs.

[0022] During operation, open the inlet stop valve (gas line 1 and gas line 2) and the outlet stop valve (gas line 1 and gas line 2), adjust the pressure reducing valve (gas line 1 and gas line 2), and observe the readings of the outlet pressure gauge (gas line 1 and gas line 2) at the same time to make the readings reach the required pressure value. At this time, the gas line 1, gas line 2, and output pressure are the regulated pressure, and the multi-channel output is completed.

[0023] like Figure 4 As shown, air is inflated from the air inlet 1 through air line 1 to the devices on the three branches 2, 3, and 4.

[0024] Before work, check that the inlet stop valve, outlet stop valve, and bypass stop valve of each gas circuit are in the closed state. Connect the air inlet (inlet 1) of the pressure reducing module to the external gas source through a pipeline, and connect the air outlet of the pressure reducing module to the air inlet of the equipment that needs to be inflated. Plug the remaining unused air inlets (①) with plugs.

[0025] During operation, open the inlet stop valve (gas line 3), the outlet stop valve (gas line 3), and the bypass stop valve between lines 2 / 3 and 3 / 4, adjust the pressure reducing valve (gas line 3), and observe the reading of the outlet pressure gauge (gas line 3) at the same time to make the reading reach the required pressure value. At this time, the output pressure of gas line 2, gas line 3, and gas line 4 is the adjusted pressure, and the output of the specified line is completed.

[0026] There are no less than three air intake branches 11. When the pressure reducing pipeline 2 is working, in order to avoid insufficient air intake, multiple air intake branches 11 are provided to meet the air intake demand.

[0027] Wherein, a one-way air intake valve 15 is provided on the air intake branch pipe 11 to avoid backflow.

[0028] The pressure reducing branch pipe 4 is provided with a safety valve 16 between the outlet pressure gauge 8 and the outlet stop valve 9, which plays a role in safety pressure relief. The working method of the multi-connected pressure reducing module is as follows: first, the air is supplied to the air intake main pipe 1 through the air intake branch pipe 11, and then the air intake stop valve 5 and the air outlet stop valve 9 on the corresponding pressure reducing pipeline 2 are controlled to open, and then the high-pressure gas flows through the pressure reducing valve 7 to reduce the pressure, and the air intake pressure is detected by the air intake pressure gauge 10, and then the air pressure after the pressure reduction by the pressure reducing valve 7 is detected by the air outlet pressure gauge 12. According to the pressure detection result of the air outlet pressure gauge 12, the PLC controller 18 controls the bypass stop valve 3 connected to the pressure reducing pipeline 2 to connect the pressure reducing pipeline 2 with the air charging path of the adjacent pressure reducing pipeline 2 to balance the pressure so that the outlet pressure is within the set range. In this way, the desired pressure gas can be obtained without multi-stage pressure reduction, and it has the advantages of easy control and small air pressure fluctuation.

[0029] like Figure 5-7 As shown, the pressure reducing valve 7 includes a valve body 19, and one side of the valve body 19 is provided with an input port 20 for inputting high-pressure gas into the valve body 19, and one side of the valve body 19 is provided with an output port 21 for outputting the gas after the pressure reduction through the valve body 19 to the outside. The interior of the pressure reducing valve body 1 is provided with a valve plate 22 which divides the valve cavity inside the valve body 19 into two independent cavities, and the valve plate 22 is provided with a channel 23 through which gas flows, wherein the valve body 19 is installed with a valve core 24 for opening and closing the channel 23, and the bottom of the valve core 24 and the bottom of the valve body 19 are provided with an energy absorbing mechanism 25 for absorbing the instantaneous impact of the valve core 24, and the upper part of the valve body 19 is provided with a pilot valve 26, and the bottom of the valve core 24 is provided with a valve stem 27 for extending into the pilot valve 26, and the pilot valve is used to manipulate the valve stem 1 to move up and down.

[0030] The energy absorbing mechanism 25 is provided in the outer cylinder 28, and the inner cylinder 29 is provided inside the outer cylinder 28. A cavity 30 is formed between the outer cylinder 28 and the inner cylinder 29. A piston rod 31 is provided inside the inner cylinder 29 to move along the inner cylinder 29. A damping hole 32 is provided on the outer wall of the inner cylinder 29. The gaps between the inner cylinder 29 and the outer cylinder 28 are filled with hydraulic oil. A spring 33 is provided between the piston rod 31 and the bottom side of the inner cylinder 29. The bottom of the valve core 24 and the bottom of the valve body 19 are provided with an energy absorbing mechanism 25 for absorbing the instantaneous impact of the valve core 24. In this way, when the pressure fluctuates during instantaneous opening and closing, the valve core 24 will not move up and down, which would cause a large pressure fluctuation. When the valve core 24 is subjected to a transient impact, a hydraulic buffer mechanism is formed between the outer cylinder 28 and the inner cylinder 29, and hydraulic damping is used to absorb the transient impact, thereby preventing the valve core 24 from moving up and down, and also does not affect the subsequent adjustment of the valve body.

[0031] The top end of the piston rod 31 is provided with a connecting rod 34 that is vertically upward and has a smaller diameter than the piston rod 31, and the bottom of the connecting rod 34 is fixedly connected to the valve core 24. A sealing layer 35 is provided on the outer wall of the piston rod 31 for sealing the connection between the piston rod 31 and the inner cylinder body, which has a better sealing effect, thereby preventing hydraulic oil leakage.

[0032] Working principle: First, air is supplied to the air intake main pipe 1 through the air intake branch pipe 11, and then the air intake stop valve 5 and the air outlet stop valve 9 on the corresponding pressure reducing pipeline 2 are controlled to open, and then the high-pressure gas flows through the pressure reducing valve 7 to reduce the pressure, and the air intake pressure is detected by the air intake pressure gauge 6, and then the gas pressure after the pressure reduction by the pressure reducing valve 7 is detected by the air outlet pressure gauge 8. According to the pressure detection result of the air outlet pressure gauge 8, the PLC controller controls the bypass stop valve 3 connected to the pressure reducing pipeline 2 to connect the pressure reducing pipeline 2 with the inflation gas path 10 of the side pressure reducing pipeline 2 to balance the pressure so that the outlet pressure is within the set range.

[0033] There are no less than 6 groups of pressure reducing pipelines 2. In this way, multiple pressure reducing pipelines 2 are set up, and the pressure reducing pipelines 2 are connected to the inflation gas path of the pressure reducing pipelines 2 next to them for pressure balance, so that the outlet pressure is within the set range, and multiple devices can be inflated at the same time.

[0034] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are 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 will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A high-pressure gas multi-connected pressure reducing module, characterized in that: It comprises an air intake main pipe (1), the air intake main pipe (1) is provided with a plurality of pressure reducing pipelines (2) arranged in parallel, and a bypass stop valve (3) is connected between the air outlet ends of the pressure reducing pipelines (2); The pressure reducing pipeline (2) comprises a pressure reducing branch pipe (4) connected to the air inlet main pipe (1), and an air inlet stop valve (5), an air inlet pressure gauge (6), a pressure reducing valve (7), an air outlet pressure gauge (8), and an air outlet stop valve (9) are installed on the pressure reducing branch pipe (4) in the order of gas passing through, and the outer end of the air outlet stop valve (9) is connected to the inflation air circuit (10); The air intake main pipe (1) is provided with a plurality of air intake branch pipes (11), and each air intake branch pipe (11) is provided with an on-off valve (12) and a filter (13); It also includes a PLC controller, and the air inlet stop valve (5), air inlet pressure gauge (6), pressure reducing valve (7), air outlet pressure gauge (8), air outlet stop valve (9) and switch valve (12) are all connected to the PLC controller.

2. A high-pressure gas multi-connected pressure reducing module according to claim 1, characterized in that: The number of the pressure reducing pipelines (2) is no less than 6.

3. A high-pressure gas multi-connected pressure reducing module according to claim 1, characterized in that: There are no less than three intake branch pipes (11).

4. A high-pressure gas multi-connected pressure reducing module according to claim 1, characterized in that: The air intake branch pipe (11) is provided with a one-way air intake valve (15).

5. The high-pressure gas multi-connected pressure reducing module according to claim 1, characterized in that: The pressure reducing branch pipe (4) is provided with a safety valve (16) between the outlet pressure gauge (8) and the outlet stop valve (9).

6. A high-pressure gas multi-connected pressure reducing module according to any one of claims 1 to 5, characterized in that: The working method of the multi-connected pressure reducing module is as follows: first, air is supplied to the air intake main pipe through the air intake branch pipe, and then the air intake stop valve and the air outlet stop valve on the corresponding pressure reducing pipeline are controlled to open, and then the high-pressure gas flows through the pressure reducing valve to reduce the pressure, and the air intake pressure is detected by the air intake pressure gauge, and then the gas pressure after the pressure reduction by the pressure reducing valve is detected by the air outlet pressure gauge. According to the pressure detection result of the air outlet pressure gauge, the PLC controller controls the bypass stop valve connected to the pressure reducing pipeline to connect the pressure reducing pipeline with the inflation gas path of the pressure reducing pipeline on the side, and performs pressure balance so that the outlet pressure is within the set range.

7. The high-pressure gas multi-connected pressure reducing module according to claim 1, characterized in that: The pressure reducing valve (7) includes a valve body (19), and one side of the valve body (19) is provided with an input port (20) inside the valve body (19) for inputting high-pressure gas, and one side of the valve body (19) is provided with an output port (21) for outputting the gas after the pressure reduction through the valve body (19) to the outside. The pressure reducing valve body (1) is provided with a valve plate (22) for dividing the valve cavity inside the valve body (19) into two independent cavities, and the valve plate (22) is provided with a channel (23) through which gas flows, wherein the valve body (19) is installed with a valve core (24) for opening and closing the channel (23), and the bottom of the valve core (24) and the bottom of the valve body (19) are provided with an energy absorbing mechanism (25) for absorbing energy of instantaneous impact of the valve core (24), and the upper part of the valve body (19) is provided with a pilot valve (26), and the bottom of the valve core (24) is provided with a valve stem (27) for extending into the pilot valve (26), and the pilot valve is used to manipulate the valve stem (1) to move up and down.

8. The high-pressure gas multi-connected pressure reducing module according to claim 2, characterized in that: The energy absorbing mechanism (25) is arranged in an outer cylinder (28), and an inner cylinder (29) is arranged inside the outer cylinder (28), and a cavity (30) is formed between the outer cylinder (28) and the inner cylinder (29), and a piston rod (31) is arranged inside the inner cylinder (29) and moves along the inner cylinder (29), and a damping hole (32) is provided on the outer wall of the inner cylinder (29), and the gaps between the inner cylinder (29) and the outer cylinder (28) are filled with hydraulic oil, and a spring (33) is provided between the piston rod (31) and the bottom side of the inner cylinder (29).

9. The high-pressure gas multi-connected pressure reducing module according to claim 1, characterized in that: A connecting rod (34) extending vertically upward and having a smaller diameter than the piston rod (31) is provided at the top end of the piston rod (31), and the bottom of the connecting rod (34) is fixedly connected to the valve core (24). A sealing layer (35) for sealing the connection between the piston rod (31) and the inner cylinder is provided on the outer wall of the piston rod (31).

Images