CN221619015U

CN221619015U - Pressure swing adsorption nitrogen making machine

Info

Publication number: CN221619015U
Application number: CN202323003245.3U
Authority: CN
Inventors: 胥直平
Original assignee: Xiamen Dongshen Gas Equipment Co ltd
Current assignee: Xiamen Dongshen Gas Equipment Co ltd
Priority date: 2023-11-08
Filing date: 2023-11-08
Publication date: 2024-08-30
Anticipated expiration: 2033-11-08

Abstract

The utility model relates to the field of air separation, and discloses a pressure swing adsorption nitrogen making machine, which comprises a pressurizing and purifying module, wherein the pressurizing and purifying module conveys air to an air separation module, the air separation module comprises a group of paired adsorption towers, the air enters from an air suction valve arranged on the adsorption towers and is separated into nitrogen and oxygen in the adsorption towers, the nitrogen is conveyed to a gas output module from an air suction valve, the nitrogen is conveyed back to the adsorption towers from a back blowing valve and is discharged from an exhaust valve, the adsorption towers are divided into a first adsorption tower and a second adsorption tower, pressure equalizing valves which can be opened and closed are arranged on connecting pipes of the first adsorption tower and the second adsorption tower, and in the pressure equalizing valve opening state, the pressure equalizing valves are in pressure equalization of the first adsorption tower and the second adsorption tower, after the first adsorption tower is desorbed, the pressure of the first adsorption tower is communicated with the second adsorption tower, the pressure of the first adsorption tower is quickly increased, so that the pressurizing time is reduced, the energy consumption of the volume of the nitrogen is reduced, the paired adsorption towers is smooth, and the desorption-adsorption compactness can be realized in time.

Description

Pressure swing adsorption nitrogen making machine

Technical Field

The utility model relates to the field of air separation, and particularly discloses a pressure swing adsorption nitrogen making machine.

Background

The nitrogen generator is an apparatus for generating high purity nitrogen gas. It produces pure nitrogen by separating the gases in the air. The main application of the nitrogen making machine comprises the following aspects:

Industrial application: the nitrogen making machine is widely applied to the industrial field, in particular to the industries of chemical industry, electronics, pharmacy, food, metal processing and the like. Nitrogen may be used as an inert gas to protect and control oxygen and moisture during the reaction.

The nitrogen making machine has very wide application and covers a plurality of fields of industrial production, food processing, medical treatment, scientific research and the like. The nitrogen gas can provide high-quality pure nitrogen gas for various industries and meet the requirements of different applications.

Pressure swing adsorption nitrogen production is one of the common modes of producing nitrogen, which typically uses Carbon Molecular Sieves (CMS) to separate gases and produce pure nitrogen. However, although this technology has been widely used, there are still some technical problems in practical applications.

The energy consumption is higher: the pressure swing adsorption nitrogen production process generally requires higher energy consumption, and in the oxygen and nitrogen adsorption and desorption processes, a large amount of energy is required to achieve regeneration and recycling of the adsorbent, and particularly in the recycling process between paired adsorption towers, the pressure difference is not effectively utilized, so that higher running cost and energy waste are caused.

The nitrogen making machine is connected into the reaction kettle, especially the reaction kettle for generating gas, and the pressure in the reaction kettle is possibly larger than the pressure of the nitrogen making machine due to personnel error, so that the gas or material in the reaction kettle is backflushed, and the equipment of the nitrogen making machine is polluted.

Disclosure of Invention

Aiming at the defects existing in the prior art, the utility model provides a pressure swing adsorption nitrogen making machine, which comprises a pressurizing and purifying module, wherein the pressurizing and purifying module conveys air to an air separation module, the air separation module comprises a group of paired adsorption towers, the air enters from an air suction valve arranged on the adsorption towers and is separated into nitrogen and oxygen in the adsorption towers, the nitrogen is conveyed to a gas output module from an air suction valve, the nitrogen is conveyed back to the adsorption towers from a back blowing valve, the oxygen is discharged from an exhaust valve,

The pair of adsorption towers are divided into a first adsorption tower and a second adsorption tower, and pressure equalizing valves capable of being opened and closed are arranged on connecting pipelines of the first adsorption tower and the second adsorption tower, and in an opened state of the pressure equalizing valves, the pressure of the first adsorption tower and the pressure of the second adsorption tower are balanced.

In some embodiments, a muffler is also connected to the exhaust valve.

In some embodiments, the pressurized purification module includes an air pressurizer that pressurizes air to an air pretreatment stack comprised of multiple stages of dryers or multiple stages of filter gases in series.

In some embodiments, the multi-stage dryer is selected from any of a freeze dryer, an adsorption dryer.

In some embodiments, the suction valve, the exhaust valve, the suction valve and the equalizing valve are controlled to open and close by a programmable controller.

In some embodiments, the gas output module comprises a nitrogen storage tank, the inlet pipe of the nitrogen storage tank is connected with an air suction valve arranged on the adsorption tower, and the outlet pipe of the nitrogen storage tank is sequentially connected with a nitrogen filtering pressure reducing valve, a lower ball valve of a flowmeter, the flowmeter and a non-return alarm.

In some embodiments, the check alarm is in signal connection with a nitrogen gas production valve, an air pressurization machine, a blow-off valve and a nitrogen production valve through communication control lines.

In some embodiments, the check alarm includes a one-way valve and a one-way trigger in parallel.

In some embodiments, a floating piston is arranged in the unidirectional trigger, the floating piston is provided with a metal outer ring, when the floating piston moves along the axial direction of the cylinder, the metal outer ring can contact an electric contact arranged on the inner wall of the cylinder, and the communication control line is conducted.

The utility model has the advantages that:

1. When the utility model is used for production in the biochemical field, the check alarm at the tail end of the gas output module can effectively prevent the gas or liquid of the connected equipment from backflushing and stopping the adsorption nitrogen making machine when production accidents occur, thereby increasing the safety coefficient when the utility model is used in the chemical and biological production field and reducing the possibility of equipment damage when accidents occur.

2. The check alarm is electrically connected with the electromagnetic emptying valve, can be used as safety redundancy for production, and can be used as a safety release device when the pressure of the connected reaction kettle is too high, so that the safety of field personnel is protected.

3. The utility model adopts the double adsorption towers to circularly work, and the pressure equalizing valve balances the pressure difference between the adsorption towers in a circulation gap, thereby reducing the pressurization time in the circulation process, reducing the energy consumption of unit production gas and increasing the nitrogen yield in unit production time.

Drawings

FIG. 1 is a diagram showing the equipment, piping and electrical connections of the present utility model

FIG. 2 is a diagram showing the connection of pipelines of the air separation module device of the utility model

FIG. 3 is a diagram showing the connection of the pressurized purification module of the present utility model

FIG. 4 is a schematic diagram showing the internal series connection of the air pretreatment module of the present utility model

FIG. 5 is a diagram showing the connection between the programmable logic controller and the solenoid valve according to the present utility model

FIG. 6 is a diagram showing the equipment management connection of the gas output module according to the present utility model

FIG. 7 is a view showing an external construction of the check alarm of the present utility model

FIG. 8 is a cross-sectional view showing a first operational state of the one-way trigger of the present utility model

FIG. 9 is a cross-sectional view showing a second operational state of the one-way trigger of the present utility model

Illustration of: 1. a space division module; 11. an adsorption tower; 111. a first adsorption tower; 121. a second adsorption tower 15 and a muffler; 17. an air intake valve; 18. a blowback valve; 13. a pressure equalizing valve; 131 a first equalizing valve; 132. a second equalizing valve; 14. an air suction valve; 141. a first intake valve; 142. a second intake valve; 19. an exhaust valve; 191. a first exhaust valve; 192. a second exhaust valve; 20. an air sucking valve; 201. a first suction valve; 202. a second suction valve; 7. a pressurized purification module; 71. an air pressurizing machine; 72. an air pretreatment group; 721. a multistage dryer; 7211. a freeze dryer; 7212. an adsorption dryer; 722. a multi-stage filter; 7221. a main filter; 7222. a primary filter; 7223. fine filter; 7224. an active carbon oil removal filter; 73. a pilot gas pressure reducing valve; 74. an air storage tank; 8. a programmable controller; 81. an electric air line; 9. a gas output module; 91. nitrogen gas production valve, 92, nitrogen storage tank; 93. a blow-off valve; 94. a nitrogen filtering pressure reducing valve; 95. a test port; 96. a ball valve is arranged under the flowmeter; 97. a flow meter; 98. a nitrogen production valve; 99. a filter; 991. a sterilizing filter; 992. a dust removal filter; 993. an odor removal filter; 10. a non-return alarm; 101. a communication control line; 102. a one-way valve; 103. a one-way trigger; 1031. a floating piston; 10311. a metal outer ring; 1032. an electrical contact; 1033. a cylinder;

Detailed Description

For a better understanding of the present invention, reference will be made to the following drawings and detailed description

The present invention will be described in further detail.

In the following description, spatial and azimuthal terms such as vertical "and" horizontal "may be used to describe embodiments of the utility model, but it should be understood that these terms are merely for convenience in describing the embodiments shown in the drawings and do not require that the actual device be constructed or operated in a particular orientation. In the following description, the use of terms such as "connected," "coupled," "fixed," and "attached" may refer to two elements or structures being directly connected without other elements or structures, and may refer to two elements or structures being indirectly connected through intervening elements or structures, unless the context clearly dictates otherwise. The term "drive connection" refers to the transmission of power and the relative movement resulting therefrom between two or more elements or structures in a connected relationship.

In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected or detachably connected or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the utility model, the back-blowing valve is in a normally open state and is connected with the first adsorption tower and the second adsorption tower at the same time.

In the utility model, the structure of the corresponding connecting valve of the first adsorption tower and the second adsorption tower is completely consistent with the internal structure.

In the present utility model, "HEPA" refers to HIGH EFFICIENCY ParticulateAir, a net-like, porous structural material made of synthetic, glass or natural fibers capable of capturing dust above 0.3um diameter.

In the present utility model, "ULPA" refers to Ultra Low PenetrationAir, a network structure porous fibrous structure capable of capturing dust above 0.1um diameter.

In the present utility model, the "air compressor" or "air compressor" may be a compressor capable of pressurizing air, such as a screw air compressor or a piston air compressor, and particularly, an oil-free screw air compressor or an oil-free piston air compressor is preferable.

The principle of the utility model is as follows: carbon molecular sieve is a porous material formed by micropores, and can be used for separating different components in mixed gas. The principle is based on the size and polarity differences of the molecules.

In the utility model, the active carbon oil removing filter mainly plays roles of deep oil removing, hydrocarbon adsorption and peculiar smell removal.

In the utility model, the air inlet pipe and the air outlet pipe of the non-return alarm can be connected with a degerming filter, a dedusting filter and an odor removing filter in series according to the process selection.

The nitrogen (N ₂) and oxygen (O ₂) molecules in the air are very small and can repel through the carbon molecular sieve microporous surface, while larger molecules (e.g. argon and carbon dioxide) can be more easily adsorbed. This repulsive effect is based on the interaction of molecules between the microporous surfaces, and thus separation of nitrogen and oxygen can be achieved.

In carbon molecular sieves, nitrogen molecules are slightly larger than oxygen molecules, so the adsorption force in the microporous structure is stronger, nitrogen is more adsorbed, and oxygen is relatively less. By properly adjusting the pore size and the surface property of the carbon molecular sieve, high-efficiency separation and enrichment of nitrogen or oxygen can be realized.

By periodically changing the conditions of adsorption and desorption, the adsorbed gas can be released, thereby achieving separation of nitrogen and oxygen. This process can be cycled for large scale production of high purity nitrogen or oxygen.

Example 1:

The utility model uses the selective adsorption property of carbon molecular sieve, and adopts the cycle of pressure adsorption and pressure reduction desorption, so that the compressed air alternately enters the adsorption tower (can be completed by a single tower) to realize air separation, thereby continuously producing high-purity nitrogen.

The utility model comprises a pressurized purification module which delivers air to an air separation module 1, the air separation module 1 comprising a set of paired adsorption towers 1, divided into a first adsorption tower 111 and a second adsorption tower 121.

1. Adsorption: referring to fig. 1 to 3, the air separation module 1 delivers air to the first adsorption tower 111 by pressurization, in which the first intake and suction valve 141, the first suction valve 201, and the second discharge valve 192 are all opened, and the second intake and suction valve 142, the second production valve 202, and the first discharge valve 191 are closed.

The pressure of the first adsorption tower 111 rises, the carbon molecular sieve adsorbs oxygen, the oxygen in the air is adsorbed nitrogen and is not adsorbed, the nitrogen passing through the carbon molecular sieve is conveyed from the first suction valve 201 to the pressurized purification module 7, and in the process, the first adsorption tower 111 completely adsorbs the nitrogen production process.

2. Equalizing pressure: after the first adsorption tower 111 completes the nitrogen production adsorption process, the first air intake and suction valve 141, the first suction air valve 201 and the first exhaust valve 191, the second air intake and suction valve 142, the second gas production valve 202 and the second exhaust valve 192 are all closed, after the pressure equalizing valve 13 is opened for 2 to 3 seconds, the pressure equalizing valve 13 is closed after the first adsorption tower 111 and the second adsorption tower 121 are pressure-equalized, and the second air intake and suction valve 142, the second gas production valve 202 and the first exhaust valve 191 are opened, the pressure of the second adsorption tower 121 is increased under the air transportation of the pressurized purification module 7, the second adsorption tower 121 enters the adsorption process, and the first adsorption tower 111 enters the desorption process.

In the process, the pressure equalizing valve 13 is opened and closed to transmit the pressure of the first adsorption tower 111 to the second adsorption tower 121, so that the second adsorption tower 121 reaches the preset pressure, and the energy consumption of the pressurizing and purifying module is reduced.

The oxygen adsorbed by the carbon molecular sieve in the first adsorption tower 111 is released back to the atmosphere through the depressurization of the first exhaust valve 191, which is called desorption, and the first exhaust valve 191 and the second exhaust valve 192 are connected to the muffler 15.

3. Back blowing: in order to completely discharge the oxygen released by depressurization in the molecular sieve of the first adsorption column 111 into the atmosphere, the first adsorption column 111 purges the desorbing adsorption column 11 through a normally open blowback valve 18, and blows the oxygen in the first adsorption column 111 out of the adsorption column 11. This process is called blowback and is performed simultaneously with desorption.

In the back blowing process, the oxygen adsorbed by the molecular sieve in the first adsorption tower 111 flows out rapidly, so that the adsorption activity of the molecular sieve is helped to recover rapidly, and preparation is made for the next adsorption cycle.

The utility model is in the circulation of the first adsorption tower 111 pressure-equalizing the pressure of the first adsorption tower 111 and the second adsorption tower 121-the back blowing desorption of the first adsorption tower 111/the pressure-equalizing the pressure of the first adsorption tower 111 and the second adsorption tower 121-the pressure-equalizing the pressure of the first adsorption tower 111 and the second adsorption tower 121 and the desorption of the second adsorption tower 121.

Example 2:

Referring to fig. 1 and 5 again, embodiment 2 is a mode of controlling adsorption by the programmable controller 8, the working flow of the adsorption nitrogen making machine of the present utility model is completed by controlling three two-position five-way pilot electromagnetic valves by the programmable controller 8, and then respectively making eight pneumatic pipeline valves by the three two-position five-way pilot electromagnetic valves, wherein the eight pneumatic pipeline valves are respectively a first air intake valve 141, a first air exhaust valve 201, a first air exhaust valve 191 are all opened, a first pressure equalizing valve 131, a second pressure equalizing valve 132, a second air intake valve 142, a second air production valve 202 and a second air exhaust valve 192.

The three two-position five-way pilot electromagnetic valves respectively control adsorption, pressure equalizing, desorption and blowback states of the first adsorption tower 111 and the second adsorption tower 121 through eight pneumatic pipeline valves respectively. The time flows of adsorption, desorption, pressure equalization and blowback of the first adsorption tower 111 and the second adsorption tower 121 have been stored in the programmable controller 8, and in the power-off state, the pilot gas of the three two-position five-way pilot solenoid valves is all connected to the closing port of the pneumatic pipeline valve. When the process is in the adsorption state of the first adsorption tower 111, the electromagnetic valve of the first adsorption tower 111 is controlled to be electrified, and the pilot gas is communicated with the openings of the first air inlet and suction valve 141, the first air suction valve 201 and the second air discharge valve 192, so that the three valves are opened to complete the adsorption process of the first adsorption tower 111, and meanwhile, the second adsorption tower 121 is desorbed. When the flow is in the equalizing state, the first equalizing valve 131 and the second equalizing valve 132 are controlled to be turned on, and the other valves are controlled to be turned off.

The pilot gas is communicated with the opening ports of the first equalizing valve 131 and the second equalizing valve 132, so that the two valves are opened to finish the equalizing process. When the process is in the adsorption state of the second adsorption tower 121, the electromagnetic valve for controlling the adsorption of the second adsorption tower 121 is electrified, and the pilot gas is communicated with the openings of the second suction valve 142, the second gas production valve 202 and the first exhaust valve 191, so that the three valves are opened to complete the adsorption process of the second adsorption tower 121, and meanwhile, the first adsorption tower 111 is desorbed.

Example 3:

Referring to fig. 3 to 5, in comparison with embodiment 1, the pressurized purification module 7 of embodiment 3 includes an air pre-treatment group 72, a pilot gas pressure reducing pipe 73, and an air reservoir 74 in addition to the air compressor 71, and the pressurized and purified air flows from the a direction into the pilot gas pressure reducing pipe 73 and the air reservoir 74, wherein the pilot gas pressure reducing pipe 73 is controlled by the programmable logic controller 8 as described in embodiment 2, and flows into the air separation module 1 through the B direction via the air reservoir 74 buffering and pilot gas pressure reducing pipe 73.

Carbon molecular sieves are sensitive to compressed air impurities, so that the compressed air must be subjected to cooling, water removal, oil removal, dust removal and the like before entering the nitrogen making host, and the air pretreatment group 72 is arranged for this purpose.

The air pre-conditioning unit 72 includes a freeze dryer or (and) an adsorption dryer for removing water and dust from the compressed air.

The freeze drier adopts R-134a or R-22 refrigerant as coolant to cool the gas in the compressed air, and the gaseous water and oil in the air are cooled to liquid state and then removed.

The adsorption dryer works on the principle that moisture in air is adsorbed by using an adsorbent (such as silica gel or molecular sieve), and then the moisture on the adsorbent is removed through a regeneration process so as to be reused.

The air pretreatment group can be further provided with a multi-stage filter 722 in series connection with air, such as a primary main filter for filtering air by using fiber materials, a HEPA primary filter and a primary fine filter for filtering ULPA, and the air output by the pressurizing and purifying module accords with the oil-free and dust-free effect by connecting the multi-stage filter 722 with an active carbon oil removing filter at the tail end, so that the service life of carbon molecular sieve filler in the adsorption tower is prolonged.

Example 4:

Referring to fig. 6 to 9, the present embodiment 4 describes the flow path arrangement of the gas output module 9, the gas output module 9 includes the nitrogen storage tank 92, the inlet pipe of the nitrogen storage tank 92 is provided with the nitrogen gas producing valve 91, the nitrogen gas producing valve 91 is an electromagnetic valve, the pressure of the nitrogen gas inputted from the C-direction air separation module 1 is gentle, and the outlet pipe of the nitrogen storage tank is sequentially provided with the nitrogen filtering pressure reducing valve 94, the flowmeter ball valve 96, the flowmeter 97 and the non-return alarm 10.

Wherein the construction of the check alarm 10 is seen in fig. 7 to 9, wherein fig. 8 and 9 are A-A cross-sectional views of the one-way trigger 103, the check alarm 10 comprises a one-way valve 102 and one-way trigger 103 in parallel.

The one-way trigger 103 is internally provided with a floating piston 1031, the floating piston 1031 is provided with a metal outer ring 10311, when the floating piston 1031 moves along the axial direction of the cylinder 1033, the metal outer ring 10311 can contact an electric contact 1032 arranged on the inner wall of the cylinder 1033, the communication control line 101 is conducted, and the floating piston 1031 can be made of rubber, silica gel or the like for improving the air tightness.

Referring to fig. 8, the check valve 102 only allows the gas to be transferred from the X direction to the Y direction, and when the present utility model is working normally, the gas is transferred from the X direction to the Y direction, and the floating piston 1031 of the one-way trigger 103 is located at the bottom of the cylinder 1033, and the state is defined as the first working state of the one-way trigger 103.

When the pressure of the reaction kettle device connected with the utility model is overlarge and is larger than the output pressure of the utility model, gas or liquid is poured from a nitrogen output port, namely, external gas and liquid are poured from a Y-to-X path as shown in fig. 9, a one-way valve 102 is closed, a floating piston 1031 in a one-way trigger 103 connected with a pipeline in parallel is lifted, a metal outer ring 10311 arranged at the upper end of the floating piston 1031 contacts an electric contact 1032 arranged on the inner wall of a cylinder 1033, the state is defined as a second working state of the one-way trigger 103, in the second working state, a communication control line 101 is communicated, a signal is sent to a programmable controller 8, the programmable controller 8 controls an electromagnetic valve to operate, an emptying valve 93 is opened, a nitrogen gas producing valve 91 is closed, a nitrogen producing valve 98 is kept open, a ball valve 96 under a flowmeter is controlled, and the air pressurizing machine 71 is controlled to stop operating.

The reaction kettle content is prevented from being poured into the air separation module 1, and the opening state of the air release valve 93 can be used as a pressure release device in the reaction kettle and as one of safety redundant devices, so that the potential safety hazard on site is reduced, and the property loss is avoided.

It will be apparent that the described embodiments are only some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Claims

1. The utility model provides a pressure swing adsorption nitrogen making machine, includes pressurization purification module (7), pressurization purification module (7) carries air to air separation module (1), air separation module (1) are including a set of paired adsorption tower (11), the air gets into from suction valve (14) that set up on adsorption tower (11) to separate into nitrogen gas and oxygen in adsorption tower (11), nitrogen gas is from inhaling air outlet valve (20) and is carried gas output module (9), nitrogen gas is still from blowback valve (18) back to adsorption tower (11), oxygen is discharged from discharge valve (19),

The device is characterized in that the paired adsorption towers (11) are divided into a first adsorption tower (111) and a second adsorption tower (121), a pressure equalizing valve (13) capable of being opened and closed is arranged on a connecting pipeline of the first adsorption tower (111) and the second adsorption tower (121), and the pressure of the first adsorption tower (111) and the pressure of the second adsorption tower (121) are balanced under the opening state of the pressure equalizing valve (13).

2. Pressure swing adsorption nitrogen generator according to claim 1, characterized in that the exhaust valve (19) is also connected with a muffler (15).

3. Pressure swing adsorption nitrogen generator according to claim 1, characterized in that the pressurized purification module (7) comprises an air pressurizer (71), the air pressurizer (71) pressurizing air is fed to an air pretreatment group (72), the air pretreatment group (72) consists of a multistage dryer (721) or a multistage filter (722) gas in series.

4. A pressure swing adsorption nitrogen generator according to claim 3, wherein the multi-stage dryer (721) is selected from any one of a freeze dryer (7211) and an adsorption dryer (7212).

5. The pressure swing adsorption nitrogen generator according to claim 2, wherein the suction valve (14), the exhaust valve (19), the suction valve (20) and the pressure equalizing valve (13) are controlled to be opened and closed by a programmable controller (8).

6. The pressure swing adsorption nitrogen generator according to claim 1, wherein the gas output module (9) comprises a nitrogen storage tank (92), an inlet pipe of the nitrogen storage tank (92) is connected with the suction air valve (20) arranged on the adsorption tower (11), and an outlet pipe of the nitrogen storage tank (92) is sequentially connected with a nitrogen filtering pressure reducing valve (94), a flowmeter lower ball valve (96), a flowmeter (97) and a non-return alarm (10).

7. The pressure swing adsorption nitrogen generator of claim 6, wherein the check alarm (10) is connected to the programmable controller (8) by a communication control line (101).

8. The pressure swing adsorption nitrogen generator of claim 7, wherein the check alarm (10) includes a one-way valve (102) and a one-way trigger (103) in parallel.

9. The pressure swing adsorption nitrogen generator according to claim 8, wherein a floating piston (1031) is disposed in the unidirectional trigger (103), the floating piston (1031) is provided with a metal outer ring (10311), and when the floating piston moves axially along the cylinder (1033), the metal outer ring (10311) can contact an electrical contact (1032) disposed on the inner wall of the cylinder (1033), and the communication control line (101) is conducted.