An inflatable matching device

Abstract

The utility model discloses a gas charging device, which is used to be connected between a bladder accumulator and a gas cylinder. The gas charging device includes a control component and a first air pipe. The control component includes an accumulator gas charging tool and a pressure reducing valve connected to the accumulator gas charging tool. The accumulator gas charging tool is used to be installed at the top gas valve of the bladder accumulator. The accumulator gas charging tool is connected to a first pressure gauge for displaying the internal air pressure. The pressure reducing valve is close to the bladder accumulator. The pressure reducing valve is connected to a third pressure gauge for displaying the air pressure of the gas outlet of the pressure reducing valve. One end of the first air pipe is connected to an end of the pressure reducing valve away from the accumulator gas charging tool. The other end of the first air pipe is used to be connected to the bottle valve of the gas cylinder, wherein the pressure reducing valve is configured to be adjusted according to the first pressure gauge and the third pressure gauge during the gas charging process. The problem of low working efficiency and great safety hazards caused by the difficulty of communication and cooperation between the two groups of personnel when the distance between the accumulator and the nitrogen cylinder is large is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of accumulators, in particular to an inflatable matching device. Background Art

[0002] As a common component of hydraulic system, the bladder accumulator needs to regularly check and replenish the nitrogen pressure in the bladder during use and maintenance. When the pressure value in the nitrogen bottle is higher than the pressure value of the accumulator bladder, the nitrogen bottle can be directly connected to the accumulator for nitrogen filling.

[0003] In actual factory applications, the pressure reducing valve is installed on one side of the nitrogen cylinder. The nitrogen cylinder is connected to the charging tool on the accumulator through the pressure reducing valve via the air pipe, and the nitrogen charging operation is performed according to the nitrogen pressure setting value in the accumulator bladder required by the drawings. However, since the valve core of the air valve at the top of the accumulator is too narrow, there is pressure attenuation when the gas passes through the air valve at the top of the accumulator, resulting in a pressure drop in the charging gas path. This pressure drop value is different in different charging systems. The operator needs to repeatedly adjust the pressure reducing valve until the air pressure in the accumulator reaches the pressure setting value. Such repeated operations result in low charging efficiency.

[0004] During the nitrogen filling operation, personnel need to be arranged near the nitrogen cylinder to monitor the actual gas pressure of the nitrogen cylinder, and personnel need to be arranged near the accumulator to adjust the pressure reducing valve. Personnel need to be arranged near the nitrogen cylinder and the accumulator, and the operators in these two areas need to communicate with each other. However, in actual factory applications, the pressure reducing valve is installed on one side of the nitrogen cylinder, and the nitrogen cylinder and the accumulator are far apart, which makes communication and coordination difficult between the operators near the nitrogen cylinder and the accumulator, resulting in low operating efficiency and greater safety hazards. Utility Model Content

[0005] In order to solve the above problems, the present application provides an inflation matching device.

[0006] The present application provides an inflation matching device for connecting between a bladder accumulator and a gas cylinder, the inflation matching device comprising a control component and a first air pipe, the control component comprising an accumulator inflation tool and a pressure reducing valve connected to the accumulator inflation tool, the accumulator inflation tool being used to be installed at the top air valve of the bladder accumulator, the accumulator inflation tool being connected to a first pressure gauge for displaying the internal air pressure, the pressure reducing valve being close to the bladder accumulator, the pressure reducing valve being connected to a third pressure gauge for displaying the air pressure at the air outlet of the pressure reducing valve, one end of the first air pipe being connected to an end of the pressure reducing valve away from the accumulator inflation tool, the other end of the first air pipe being connected to the cylinder valve of the gas cylinder, wherein the pressure reducing valve is configured to be adjusted according to the first pressure gauge and the third pressure gauge during the inflation process.

[0007] In some embodiments, the first air pipe is a hose assembly.

[0008] In some embodiments, the joint of the first gas tube for connecting to the cylinder valve of the gas cylinder is a flexible joint.

[0009] In some embodiments, the control assembly further comprises a shut-off valve, and the accumulator charging tool, the shut-off valve and the pressure reducing valve are connected in sequence.

[0010] In some embodiments, the air outlet of the shut-off valve is connected to the air inlet of the accumulator charging tool, and the air inlet of the shut-off valve is connected to the air outlet of the pressure reducing valve through a second air pipe, and the length of the second air pipe is shorter than that of the first air pipe.

[0011] In some embodiments, the pressure reducing valve is connected to a second pressure gauge for displaying the gas pressure at the gas inlet of the pressure reducing valve.

[0012] In some embodiments, the accumulator charging tool comprises a CQJ-type charging tool.

[0013] In some embodiments, the pressure reducing valve is a high-pressure pressure reducing valve, and the stop valve is a high-pressure stop valve.

[0014] In some embodiments, the gas cylinder is a nitrogen cylinder, and the medium gas in the bladder accumulator is nitrogen.

[0015] In some embodiments, the control valve further comprises a stop valve, the accumulator charging tool, the stop valve and the pressure reducing valve are connected in sequence, and the first air pipe and the pressure reducing valve are connected to the air inlet of the pressure reducing valve;

[0016] Under the condition that the pressure range of the nitrogen cylinder is 13MPa±0.5MPa, the withstand pressure of the stop valve and the pressure reducing valve are both greater than 15MPa.

[0017] The beneficial effects of the present application are as follows: providing an inflatable matching device, including a control component and a first air pipe, the control component including an accumulator inflating tool and a control valve, the control valve including a pressure reducing valve, the accumulator inflating tool is installed at the top air valve of the bladder accumulator, the accumulator inflating tool, the pressure reducing valve and the first air pipe are connected in sequence, the first air pipe is connected to the bottle valve of the gas cylinder, by adjusting the pressure reducing valve, the gas cylinder inflates the bladder accumulator through the accumulator inflating tool, and the various parts of the device are used in an orderly manner;

[0018] The accumulator charging tool is connected to a first pressure gauge for displaying the internal air pressure, and the pressure reducing valve is connected to a third pressure gauge for displaying the air pressure at the air outlet of the pressure reducing valve. During the charging process, the air pressure at the air outlet of the pressure reducing valve is greater than the air pressure inside the accumulator due to the pressure drop in the air path. The pressure reducing valve needs to be adjusted repeatedly to make the air pressure inside the accumulator reach the specified charging pressure.

[0019] By installing the core parts including the accumulator charging tool and the pressure reducing valve as the control valve on the side where the bladder accumulator is located and relatively far away from the side where the gas cylinder is located, the operator monitors the first pressure gauge and the third pressure gauge and adjusts the pressure reducing valve on the accumulator side. During the charging operation, the personnel can complete most of the operation process on the side where the bladder accumulator is located, thereby solving the problem of low operation efficiency and greater safety hazards caused by the difficulty of communication and cooperation between the two groups of personnel when the distance between the accumulator and the nitrogen cylinder is large;

[0020] By using the inflation supporting device of the present application, when inflating the bladder accumulator, the potential safety hazard in the inflation process is eliminated, and the operators all work on the side where the accumulator is located, thereby facilitating communication and coordination between the operators, saving operation time and improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model.

[0022] Figure 1 A schematic diagram of the assembly of an inflatable matching device provided in this application;

[0023] Figure 2 A schematic diagram of the accumulator charging tool provided for this application installed on a bladder accumulator;

[0024] Figure 3 A schematic diagram of the structure of the accumulator charging tool provided for this application;

[0025] Figure 4 A schematic diagram of the structure of the stop valve provided for this application;

[0026] Figure 5 A schematic diagram of the structure of the pressure reducing valve provided for this application;

[0027] Figure 6 This is a schematic diagram of the structure of the first air pipe provided in this application.

[0028] Figure markings: 10-inflating supporting device, 100-control component, 110-accumulator charging tool, 111-thimble handle, 112-thimble, 113-first pressure relief valve, 114-first air inlet, 115-first air outlet, 116-first pressure gauge, 120-control valve, 121-stop valve, 121a-switch handle, 121b-second air inlet, 121c-second air outlet, 122-pressure reducing valve, 122a-adjusting handle, 122b-second pressure relief valve, 122c-third air inlet, 122d-third air outlet, 122e-second pressure gauge, 122f-third pressure gauge, 123-second air pipe, 200-first air pipe, 210-hose, 220-first connector, 230-second connector, 20-bladder accumulator, 21-air valve, 30-gas cylinder. DETAILED DESCRIPTION

[0029] In actual factory applications, the pressure reducing valve is installed on one side of the nitrogen cylinder. The nitrogen cylinder is connected to the charging tool on the accumulator through the pressure reducing valve via the air pipe, and the nitrogen charging operation is performed according to the nitrogen pressure setting value in the accumulator bladder required by the drawings. However, since the valve core of the air valve at the top of the accumulator is too narrow, there is pressure attenuation when the gas passes through the air valve at the top of the accumulator, resulting in a pressure drop in the charging gas path. This pressure drop value is different in different charging systems. The operator needs to repeatedly adjust the pressure reducing valve until the air pressure in the accumulator reaches the pressure setting value. Such repeated operations result in low charging efficiency.

[0030] During the nitrogen filling operation, personnel need to be arranged near the nitrogen cylinder to monitor the actual gas pressure of the nitrogen cylinder, and personnel need to be arranged near the accumulator to adjust the pressure reducing valve. Personnel need to be arranged near the nitrogen cylinder and the accumulator, and the operators in these two areas need to communicate with each other. However, in actual factory applications, the pressure reducing valve is installed on one side of the nitrogen cylinder, and the nitrogen cylinder and the accumulator are far apart, which makes communication and coordination difficult between the operators near the nitrogen cylinder and the accumulator, resulting in low operating efficiency and greater safety hazards.

[0031] Please refer to Figure 1 , discloses a gas charging device 10, the gas charging device 10 is connected between a bladder accumulator 20 and a gas cylinder 30. Figure 1As shown, the inflatable device 10 includes a control component 100 and a first air pipe 200. The control component 100 includes an accumulator inflating tool 110 and a control valve 120. The accumulator inflating tool 110 is installed at the top air valve 21 of the bladder accumulator 20. The control valve 120 is connected to the accumulator inflating tool 110. The control valve 120 is close to the bladder accumulator 20. One end of the first air pipe 200 is connected to the end of the control valve 120 away from the accumulator inflating tool 110, and the other end of the first air pipe 200 is connected to the bottle valve of the gas cylinder 30. By adjusting the corresponding control valve 120, the gas cylinder 30 inflates the bladder accumulator 20 through the accumulator inflating tool 110.

[0032] Please refer to Figure 1 The control valve 120 includes a pressure reducing valve 122 , which is connected to the accumulator charging tool 110 , and the pressure reducing valve 122 is close to the bladder accumulator 20 .

[0033] In this solution, the accumulator charging tool 110 is connected to a first pressure gauge 116 for displaying the internal air pressure, and the pressure reducing valve 122 is connected to a third pressure gauge 122f for displaying the air pressure at the outlet of the pressure reducing valve 122. When the ejector pin 112 of the accumulator charging tool 110 moves downward during the charging process, the one-way valve of the top air valve 21 of the bladder accumulator 20 is pushed open, and the first pressure gauge 116 can reflect the internal air pressure of the bladder accumulator 20. During the charging process, the operator compares the data of the first pressure gauge 116 and the third pressure gauge 122f, and adjusts the outlet pressure of the pressure reducing valve to adjust the reading of the first pressure gauge 116 until the reading of the first pressure gauge 116 is equal to the specified charging pressure.

[0034] The various parts of the device are used in an orderly manner. The accumulator charging tool 110 and the pressure reducing valve 122 of the control valve 120, which are the core parts, are installed on the side where the bladder accumulator 20 is located and relatively away from the side where the gas cylinder 30 is located. During the charging operation, the operator first opens the bottle valve of the gas cylinder, and the operator can complete most of the operation process on the side where the bladder accumulator 20 is located, thereby solving the problem of low operation efficiency and greater safety hazards caused by the difficulty in communication and cooperation between the two groups of personnel when the distance between the accumulator and the nitrogen cylinder 30 is large.

[0035] By using the inflation device 10 of the present application to inflate the bladder accumulator 20, the potential safety hazard during the inflation process is eliminated, and the operators all work on the side where the accumulator is located, thereby facilitating communication and coordination between the operators, saving operation time and improving work efficiency.

[0036] In some embodiments, the medium gas in the bladder accumulator 20 is nitrogen, and the gas cylinder 30 is correspondingly a nitrogen cylinder 30. Using nitrogen as the medium has the advantages of being cheap and having stable properties.

[0037] In some embodiments, Figure 1 As shown, the control valve 120 includes a stop valve 121 and a pressure reducing valve 122. The accumulator charging tool 110, the stop valve 121 and the pressure reducing valve 122 are connected in sequence, and the first air pipe 200 and the pressure reducing valve 122 are connected to the air inlet of the pressure reducing valve 122. By adding the stop valve 121 to provide an on-off control point, the accumulator charging tool 110, the stop valve 121 and the pressure reducing valve 122 cooperate with each other to realize the charging operation of the bladder accumulator 20.

[0038] In some embodiments, see Figure 1 and Figure 6 The first air pipe 200 is a hose assembly, which includes a hose 210 and a first joint 220 and a second joint 230 respectively connected to both ends of the hose 210, the first joint 220 is connected to the bottle valve of the gas cylinder 30, and the second joint 230 is connected to the control valve 120. The implementation of the hose assembly allows the first air pipe 200 to freely adjust its shape, so that the first air pipe 200 is conveniently arranged between the bladder accumulator 20 and the gas cylinder 30.

[0039] In some embodiments, the first joint 220 is a flexible joint to facilitate assembly of the device.

[0040] The accumulator charging tool 110 is installed on the air valve 21 at the top of the accumulator. The accumulator charging tool 110 can select a CQJ type charging tool or an FPU type multifunctional accumulator charging tool. The CQJ type charging tool refers to the CQJ series of charging tools, and the FPU type multifunctional accumulator charging tool refers to the FPU series of nitrogen charging tools. Both the CQJ type charging tool and the FPU type multifunctional accumulator charging tool are existing products and will not be described in detail here.

[0041] Accumulator charging tool 110 uses CQJ type charging tool, please refer to Figure 3 The accumulator charging tool 110 includes a pin handle 111 and a pin 112. The pin 112 is moved up and down by rotating the pin handle 111. The accumulator charging tool 110 includes a first pressure relief valve 113. The pressure relief protection function is realized by the first pressure relief valve 113. The accumulator charging tool 110 includes a first air inlet 114 and a first air outlet 115. The accumulator charging tool 110 is connected to the air circuit through the first air inlet 114 and the first air outlet 115. The accumulator charging tool 110 includes a first pressure gauge 116. The air pressure during inflation is displayed by the first pressure gauge 116.

[0042] Please refer to Figure 2 The top air valve 21 of the bladder accumulator 20 is a prior art product, which is similar to the principle of a bicycle valve core and is a one-way valve structure. When the ejector pin 112 of the accumulator charging tool 110 moves downward, the one-way valve of the top air valve 21 of the bladder accumulator 20 is pushed open, so that the one-way valve is opened; when the ejector pin 112 of the accumulator charging tool 110 moves upward, the one-way valve of the top air valve 21 of the bladder accumulator 20 is closed.

[0043] Please refer to Figures 1 to 3 When the CQJ type charging tool is used, the ejector handle 111 is turned clockwise to move the ejector 112 downward, thereby pushing open the one-way valve of the top air valve 21 of the accumulator, so that the accumulator charging tool 110 is connected with the inner cavity of the accumulator bladder. The measurement data of the first pressure gauge 116 can reflect the internal pressure of the bladder of the bladder accumulator 20, and nitrogen charging operation can be performed.

[0044] Please refer to Figure 4 The stop valve 121 includes a switch handle 121a, and the opening and closing of the stop valve 121 is controlled by the switch handle 121a; the stop valve 121 is provided with a second air inlet 121b and a second air outlet 121c, and the stop valve 121 is connected to the air circuit through the second air inlet 121b and the second air outlet 121c.

[0045] In some embodiments, the stop valve 121 is a high-pressure stop valve 121. Considering that the pressure range of the gas cylinder 30 is 13MPa±0.5MPa, the withstand pressure of the high-pressure stop valve 121 is greater than 15MPa. In some embodiments, the stop valve 121 is a high-pressure ball valve.

[0046] In some embodiments, see Figure 5 The pressure reducing valve 122 includes an adjusting handle 122a, by which the outlet pressure value of the pressure reducing valve 122 is adjusted. The pressure reducing valve 122 includes a second pressure relief valve 122b, by which a pressure relief protection function is provided. The pressure reducing valve 122 includes a third air inlet 122c and a third air outlet 122d, by which the pressure reducing valve 122 is connected to the air circuit. The pressure reducing valve 122 includes a second pressure gauge 122e and a third pressure gauge 122f, the second pressure gauge 122e is used to measure the gas pressure of the third air inlet 122c, the third pressure gauge 122f is used to measure the gas pressure of the third air outlet 122d, and the function of providing real-time feedback of the pressure value is more conducive to the inflation operation.

[0047] The disclosed solution needs to ensure that the air pressure in the gas cylinder is greater than the fixed inflation pressure of the accumulator. Therefore, a second pressure gauge 122e is added. The second pressure gauge 122e is used to measure the air pressure at the air inlet of the pressure reducing valve 122. The indication of the second pressure gauge 122e reflects the air pressure in the gas cylinder, ensuring that the air pressure in the gas cylinder is sufficient when the device is used, and can cooperate with the pressure reducing valve 122 and the nitrogen bottle inflation tool 110 to inflate the accumulator and inflate the accumulator to the specified inflation pressure.

[0048] In some embodiments, the pressure reducing valve 122 is a high-pressure pressure reducing valve 122. Considering that the pressure range of the gas cylinder 30 is 13 MPa±0.5 MPa, the withstand pressure of the high-pressure pressure reducing valve 122 is greater than 15 MPa.

[0049] In some embodiments, see Figure 1 The second air outlet 121c of the stop valve 121 is directly connected to the first air inlet 114 of the accumulator charging tool 110, and the second air inlet 121b of the stop valve 121 is connected to the third air outlet 122d of the pressure reducing valve 122 through the second air pipe 123, which limits the length of the second air pipe 123 to be less than the length of the first air pipe 200. In fact, the length of the second air pipe 123 is much smaller than the length of the first air pipe 200. The length of the first air pipe 200 is generally controlled at 20m-30m, and the length of the second air pipe 123 is about 0.1m.

[0050] Combined with the above-mentioned inflatable matching device 10, according to Figure 1 The assembly sequence and assembly position shown in the figure, the present disclosure provides an inflation method, comprising the following steps:

[0051] ① Install the inflatable device 10 according to Figure 1 Installation, the inflation device 10 is connected between the accumulator and the gas cylinder 30, and each valve is in the original state, specifically, the top valve of the gas cylinder 30 is closed, the stop valve 121 is closed, the ejector handle 111 of the accumulator inflation tool 110 is rotated counterclockwise to the uppermost position and the first pressure relief valve 113 of the accumulator inflation tool 110 body is closed.

[0052] ② The operator on the side where the gas cylinder 30 is located opens the valve on the top of the gas cylinder 30 and adjusts the pressure reducing valve 122 until the outlet pressure of the pressure reducing valve 122 reaches the specified inflation pressure. It should be noted that the above-mentioned specified inflation pressure has been determined in advance before the inflation operation and is determined by checking the drawings according to the specific use location.

[0053] ③ Turn the ejector handle 111 of the accumulator charging tool 110 clockwise to the lower position, and the ejector 112 of the accumulator charging tool 110 pushes open the one-way valve of the accumulator top air valve 21, opens the stop valve 121, and starts the charging operation.

[0054] ④ During the inflation period, pay attention to the indication of the first pressure gauge 116 of the accumulator charging tool 110 body. During the inflation period, the adjustment handle 122a of the pressure reducing valve 122 needs to be adjusted at any time to ensure that the indication of the first pressure gauge 116 of the accumulator charging tool 110 body is always equal to the specified inflation pressure.

[0055] ⑤ After the inflation is completed, close the stop valve 121. The methods for judging whether the inflation is completed include the listening method and the time method. In the listening method: when inflating, there is an obvious sound of air intake in the entire accumulator, and the sound disappears after the inflation is completed. You can use a listening rod to press against the top valve 21 of the accumulator to make a more detailed listening judgment. In the time method, the inflation operation is performed using the inflation matching device 10 and the gas cylinder 30 disclosed in the present invention, and the inflation can be completed in a maximum of 10 minutes. The specific inflation time depends on the volume of the accumulator and the required inflation pressure. The above 10-minute reference time is only the time required for a 50L accumulator to be charged to 3.92MPa. The above 10 minutes is the result of empirical judgment. When it comes to the inflation time required for other volumes and pressures, it is necessary to estimate based on inflation experience.

[0056] ⑥ According to the existing technical means, quickly measure the internal pressure of the bladder of the bladder accumulator 20. By rotating the ejector handle 111 of the accumulator charging tool 110 counterclockwise, unscrewing the first pressure relief valve 113 of the accumulator charging tool 110 to exhaust, and rotating the ejector handle 111 of the accumulator charging tool 110 clockwise until the first pressure gauge 116 of the accumulator charging tool 110 body displays a value, the value displayed on the pressure gauge is the internal pressure of the bladder of the bladder accumulator 20. When the internal pressure of the bladder of the bladder accumulator 20 is equal to the specified inflation pressure, the inflation operation of the bladder accumulator 20 is completed.

[0057] The above-mentioned inflation method uses the gas cylinder 30 and the inflation matching device 10 of the present disclosure. The bladder accumulator 20 is inflated by the inflation method, which improves the accuracy of the primary nitrogen filling pressure and reduces the problem of exhaust gas waste caused by high nitrogen filling pressure.

[0058] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present invention.

[0059] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. An inflatable matching device, characterized in that: Used to connect between the bladder accumulator and the gas cylinder, the charging device includes: A control assembly, comprising an accumulator charging tool and a pressure reducing valve connected to the accumulator charging tool, wherein the accumulator charging tool is used to be installed at the top air valve of the bladder accumulator, the accumulator charging tool is connected to a first pressure gauge for displaying the internal air pressure, the pressure reducing valve is close to the bladder accumulator, and the pressure reducing valve is connected to a third pressure gauge for displaying the air pressure at the air outlet of the pressure reducing valve; A first air pipe, one end of which is connected to an end of the pressure reducing valve away from the accumulator charging tool, and the other end of which is used to be connected to the cylinder valve of the gas cylinder; Wherein, the pressure reducing valve is configured to be adjusted according to the first pressure gauge and the third pressure gauge during the inflation process.

2. The inflatable matching device according to claim 1, characterized in that: The first air pipe is a hose assembly.

3. The inflatable matching device according to claim 2, characterized in that: The joint of the first air pipe used for connecting with the cylinder valve of the gas cylinder is a flexible joint.

4. The inflatable matching device according to claim 1, characterized in that: The control assembly also includes a stop valve, and the accumulator charging tool, the stop valve and the pressure reducing valve are connected in sequence.

5. The inflatable matching device according to claim 4, characterized in that: The air outlet of the stop valve is communicated with the air inlet of the accumulator charging tool, and the air inlet of the stop valve is communicated with the air outlet of the pressure reducing valve through a second air pipe, and the length of the second air pipe is shorter than that of the first air pipe.

6. The inflatable matching device according to claim 4, characterized in that: The pressure reducing valve is connected to a second pressure gauge for displaying the gas pressure at the air inlet of the pressure reducing valve.

7. The inflatable matching device according to claim 4, characterized in that: The accumulator charging tool comprises a CQJ type charging tool.

8. The inflatable accessory device according to claim 4, characterized in that: The pressure reducing valve is a high-pressure pressure reducing valve, and the stop valve is a high-pressure stop valve.

9. The inflatable matching device according to any one of claims 1 to 8, characterized in that: The gas cylinder is a nitrogen cylinder, and the medium gas in the bladder accumulator is nitrogen.

10. The inflatable accessory device according to claim 9, characterized in that: The control assembly further comprises a stop valve, the accumulator charging tool, the stop valve and the pressure reducing valve are connected in sequence, and the first air pipe and the pressure reducing valve are connected to the air inlet of the pressure reducing valve; Under the condition that the pressure range of the nitrogen cylinder is 13MPa±0.5MPa, the withstand pressure of the stop valve and the pressure reducing valve are both greater than 15MPa.

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