阅读说明：本技术 一种液驱式压缩机油雾隔离结构 (Oil mist isolation structure of liquid-driven compressor ) 是由 肖刚 张昀 卢杨 丁华云 黎卯 袁波 苏开科 郑乐辉 黄宣 于 2021-08-18 设计创作，主要内容包括：本发明涉及清洁能源设备技术领域,具体涉及一种液驱式压缩机油雾隔离结构,包括油缸和气缸,所述油缸和气缸连接,所述油缸内设置活塞,所述气缸通过活塞的运动吸气/排气,所述油缸和气缸之间设置隔离件,所述活塞上连接活塞杆,所述活塞杆的另一端位于气缸中,所述隔离件阻隔活塞杆上的油膜进入到气缸中。目的在于通过在油缸和气缸之间增加隔离件,使得活塞轴上附着的油膜被隔离在隔离件中,无法直接进入到气缸中,避免了活塞杆上的油膜由于气缸内高温而挥发,而对气缸内的气体造成污染。(The invention relates to the technical field of clean energy equipment, in particular to an oil mist isolation structure of a liquid-driven compressor, which comprises an oil cylinder and an air cylinder, wherein the oil cylinder is connected with the air cylinder, a piston is arranged in the oil cylinder, the air cylinder inhales/exhausts air through the movement of the piston, an isolation piece is arranged between the oil cylinder and the air cylinder, the piston is connected with a piston rod, the other end of the piston rod is positioned in the air cylinder, and the isolation piece blocks an oil film on the piston rod from entering the air cylinder. Aim at is through increasing the separator between hydro-cylinder and cylinder for the oil film that adheres to on the piston shaft is kept apart in the separator, can't directly enter into the cylinder, has avoided the oil film on the piston rod because the cylinder is interior high temperature and volatilize, and causes the pollution to the gas in the cylinder.)

1. The utility model provides a liquid drives formula compressor oil mist isolating structure, includes hydro-cylinder (1) and cylinder (4), hydro-cylinder (1) and cylinder (4) are connected, set up piston (13) in hydro-cylinder (1), cylinder (4) are breathed in/are discharged through the motion of piston (13), its characterized in that: set up separator (3) between hydro-cylinder (1) and cylinder (4), connect piston rod (2) on piston (13), the other end of piston rod (2) is arranged in cylinder (4), separator (3) separation oil film on piston rod (2) enters into in cylinder (4).

2. The oil mist barrier structure of a liquid drive compressor as claimed in claim 1, wherein: the piston rod (2) penetrates through the partition piece (3), a first sealing ring (20) and a second sealing ring (21) are respectively arranged at two ends of the partition piece (3), and the distance between the first sealing ring (20) and the second sealing ring (21) is larger than the maximum stroke of the piston (13).

3. The oil mist barrier structure of a liquid drive compressor as claimed in claim 2, wherein: one end of the cylinder (4) is connected with a circulating gas pipeline (5), and a communication port of the circulating gas pipeline (5) and the cylinder (4) is arranged at one end close to the oil cylinder (1); the circulating gas pipeline (5) is filled with inert positive pressure gas, and positive pressure is formed at one end, close to the oil cylinder (1), in the air cylinder (4) by the inert positive pressure gas; and the other end of the cylinder (4) is provided with an air inlet (11) and an air outlet (10).

4. The oil mist barrier structure of a liquid drive compressor as claimed in claim 3, wherein: the number of the cylinders (4) is two, the two cylinders (4) are symmetrically arranged on two sides of the oil cylinder (1), and the two cylinders (4) are communicated through a circulating gas pipeline (5); the inert positive pressure gas is nitrogen, and the pressure of the inert positive pressure gas is 0.1-1.0 MPa.

5. The oil mist barrier structure of a liquid drive compressor according to claim 3 or 4, wherein: the circulating gas pipeline (5) is connected with the isolating piece (3), a gas circuit (6) is arranged on the isolating piece (3), and the circulating gas pipeline (5) is communicated with the cylinder (4) through the gas circuit (6); the isolating piece (3) is an isolating cylinder, the first sealing ring (20) is arranged on the isolating piece (3) or the cylinder (4), and the second sealing ring (21) is arranged on the isolating piece (3) or the oil cylinder (1).

6. The oil mist barrier structure of a liquid drive compressor as claimed in claim 5, wherein: set up gas leakage detector (24) and unload hydraulic fluid port (25) on isolator (3), the detection end setting of gas leakage detector (24) is inside isolator (3), unload hydraulic fluid port (25) and set up on the route that fluid flowed through.

7. The oil mist barrier structure of a liquid drive compressor as claimed in claim 1, wherein: the piston assembly (12) is arranged at one end, arranged in the cylinder (4), of the piston rod (2), the piston assembly (12) and the piston rod (2) are arranged in a separated mode, the piston assembly (12) comprises a piston head (26), a piston body (27) and a piston tail cover (28), guide rings (29) are arranged on the piston body (27) and the piston tail cover (28), and the guide rings (29) protrude out of the peripheral surface of the piston assembly (12); and a sealing ring (30) is arranged on the piston assembly (12).

8. The oil mist barrier structure of a liquid drive compressor as claimed in claim 7, wherein: a groove (31) is formed in the piston tail cover (28), and the groove (31) is matched with the end part of the piston rod (2); one end of the piston head (26) is smaller in diameter than the piston body (27).

9. The oil mist barrier structure of a liquid drive compressor as claimed in claim 1, wherein: a buffer cavity (16) is arranged at the end part in the oil cylinder (1), and the buffer cavity (16) is matched with the piston (13); the buffer cavity (16) is communicated with the interior of the oil cylinder (1) through an oil way (18).

10. The oil mist barrier structure of a liquid drive compressor according to claim 9, wherein: the position of the oil path (18) communicated with the buffer cavity (16) is arranged on one side far away from the piston (13), and a throttle valve group (17) is arranged on the oil path (18); the oil cylinder (1) is provided with a proximity switch assembly (14), and an induction end (15) on the proximity switch assembly (14) is arranged in the buffer cavity (16).

Technical Field

The invention belongs to the technical field of clean energy equipment, and particularly relates to an oil mist isolation structure of a liquid-drive compressor.

Background

In the new energy industry, the most core equipment of a hydrogenation station is a pressurization system, a plurality of stations still use the traditional diaphragm compressor at present, and the emerging hydraulic drive compressor is certainly mature so as to replace the traditional diaphragm compressor. The liquid-driven compressors of the present stage are basically dependent on foreign imports such as Maximator in germany; hassel and Hydro-Pac in the United states, and so on. Domestic supercharging equipment is still in the research, development and exploration stage, foreign advanced technologies are absorbed for reference, innovation is improved by self, and the problem is completely solved structurally except that the hydrogen quality and the cleanliness are guaranteed in the aspect of material application.

For the technical problem of guaranteeing the quality and cleanness of hydrogen, the application of materials is generally emphasized at home and abroad nowadays, and structural consideration is very lacking. Some equipment also is equipped with a very short section oil gas separator to installed nitrogen gas and swept the mouth additional, this can be really keeping apart the gas or the liquid oil that leak and discharge respectively, but the oil film of adnexed on the piston rod exists all the time, when attaching in oily piston rod stretches into the cylinder after, the high temperature of cylinder can let the oil film volatilize and generate the oil mist, makes compressed hydrogen more or less all can receive the pollution then.

Disclosure of Invention

The invention provides an oil mist isolation structure of a liquid-driven compressor, aiming at solving the problem that an oil film attached to a piston rod can pollute hydrogen, and the oil mist isolation structure enables the oil film attached to a piston shaft to be isolated in an isolation piece and not to directly enter a cylinder by adding the isolation piece between an oil cylinder and the cylinder, so that the pollution to gas in the cylinder caused by volatilization of the oil film on the piston rod due to high temperature in the cylinder is avoided.

The technical scheme adopted by the invention is as follows: the oil mist isolation structure of the liquid-driven compressor comprises an oil cylinder and an air cylinder, wherein the oil cylinder is connected with the air cylinder, a piston is arranged in the oil cylinder, the air cylinder inhales/exhausts air through the movement of the piston, an isolation piece is arranged between the oil cylinder and the air cylinder, a piston rod is connected to the piston, the other end of the piston rod is located in the air cylinder, and the isolation piece prevents an oil film on the piston rod from entering the air cylinder.

Preferably, the piston rod penetrates through the isolating piece, a first sealing ring and a second sealing ring are respectively arranged at two ends of the isolating piece, and the distance between the first sealing ring and the second sealing ring is larger than the maximum stroke of the piston.

Preferably, one end of the cylinder is connected with a circulating gas pipeline, and a communication port of the circulating gas pipeline and the cylinder is arranged at one end close to the oil cylinder; the circulating gas pipeline is filled with inert positive pressure gas, and the inert positive pressure gas enables one end, close to the oil cylinder, in the air cylinder to have positive pressure; and the other end of the cylinder is provided with an air inlet and an air outlet.

Preferably, the number of the cylinders is two, the two cylinders are symmetrically arranged on two sides of the oil cylinder, and the two cylinders are communicated through a circulating gas pipeline; the inert positive pressure gas is nitrogen, and the pressure of the inert positive pressure gas is 0.1-1.0 MPa.

Preferably, the circulating gas pipeline is connected with the isolating piece, a gas circuit is arranged on the isolating piece, and the circulating gas pipeline is communicated with the cylinder through the gas circuit; the isolating piece is an isolating cylinder, the first sealing ring is arranged on the isolating piece or the air cylinder, and the second sealing ring is arranged on the isolating piece or the oil cylinder.

Preferably, the separator is provided with a gas leakage detector and an oil discharge port, the detection end of the gas leakage detector is arranged inside the separator, and the oil discharge port is arranged on a path through which oil flows.

Preferably, a piston assembly is arranged at one end of the piston rod arranged in the cylinder, the piston assembly and the piston rod are separately arranged, the piston assembly comprises a piston head, a piston body and a piston tail cover, guide rings are arranged on the piston body and the piston tail cover, and the guide rings protrude out of the peripheral surface of the piston assembly; and a sealing ring is arranged on the piston assembly.

Preferably, a groove is formed in the piston tail cover, and the groove is matched with the end part of the piston rod; one end of the piston head is smaller than the diameter of the piston body.

Preferably, a buffer cavity is arranged at the end part in the oil cylinder, and the buffer cavity is matched with the piston; the buffer cavity is communicated with the inside of the oil cylinder through an oil way.

Preferably, the position of the oil path communicated with the buffer cavity is arranged on one side far away from the piston, and the throttle valve group is arranged on the oil path; the oil cylinder is provided with a proximity switch assembly, and the sensing end on the proximity switch assembly is arranged in the buffer cavity.

The invention has the advantages that:

1) according to the invention, the sealing parts are respectively arranged at the two ends of the isolating part to block hydraulic oil and slightly leaked compressed hydrogen of the cylinder, and the distance between the sealing parts at the two ends is larger than the distance of the stroke of the piston in the cylinder, so that an oil film on the piston rod can be completely isolated in an isolation cavity in the isolating part and cannot enter the cylinder, further, the gas in the cylinder is polluted, and physical isolation is realized;

2) according to the invention, physical isolation and gas phase isolation are combined, and positive pressure inert gas is filled into one side of the cylinder close to the oil cylinder, so that positive pressure is generated at the contact position of the piston rod and the cylinder, hydraulic oil mist is prevented from entering the cylinder, and the condition that the compressed hydrogen is polluted when the isolated liquid oil and the oil mist enter the cylinder is thoroughly realized;

3) according to the invention, the circulating gas pipeline is arranged, so that when the equipment reciprocates, positive pressure inert gas can be filled in the two cylinders back and forth through the circulating gas pipeline, and the pressure is kept unchanged all the time, thereby preventing a small amount of volatile oil mist in the isolation cavities at the two ends from entering the cylinders;

4) the piston assembly is supported by the guide ring and is coaxial with the cylinder, and the piston assembly and the piston rod are arranged separately, so that the problem that the piston rod and the piston assembly are not coaxial when a long piston rod is machined can be solved; the piston assembly and the piston rod are separately arranged, so that the piston assembly is convenient to replace and maintain, the integral replacement is not needed, and the cost is reduced;

5) according to the invention, the buffer cavity is arranged in the oil cylinder, so that the oil cylinder is matched with the piston, when the piston moves, the extruded hydraulic oil can only pass through the gap of the matched annular oil cavity, the oil discharge resistance is increased, and the buffer purpose is achieved; an oil way is formed in the buffer cavity, so that the oil way is communicated with the inside of the oil cylinder, the flow area of hydraulic oil can be better controlled by controlling a throttle valve group on the oil way, the flow rate is adjusted, and the buffering speed of the piston can be better adjusted in an auxiliary mode.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an enlarged partial view of the cylinder end;

fig. 3 is a partially enlarged view of the cylinder piston.

In the figure: 1-oil cylinder; 2-a piston rod; 3-a spacer; 4-a cylinder; 5-a recycle gas line; 6-gas path; 7-a flange plate; 8-cylinder flange; 9-end flange; 10-air outlet; 11-an air inlet; 12-a piston assembly; 13-a piston; 14-a proximity switch assembly; 15-induction end; 16-a buffer chamber; 17-a throttle valve group; 18-oil path; 19-a buffer section; 20-sealing ring I; 21-sealing ring II; 22-a contact section; 24-a gas leak detector; 25-oil discharge port; 26-a piston head; 27-a piston body; 28-piston tail cap; 29-a guide ring; 30-a sealing ring; 31-groove.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The structure of the invention is suitable for a hydrogenation machine and is used for injecting high-pressure hydrogen.

Example one

As shown in fig. 1, an oil mist isolation structure of a fluid-driven compressor comprises an oil cylinder 1 and an air cylinder 4, wherein the oil cylinder 1 is connected with the air cylinder 4, a piston 13 is arranged in the oil cylinder 1, the air cylinder 4 inhales/exhausts air through the movement of the piston 13, two ends of the oil cylinder 1 are respectively connected with an oil inlet and an oil outlet, and the piston 13 is pushed by hydraulic oil to move left and right in the oil cylinder 1, so that the air cylinder inhales and exhausts air, and high-pressure hydrogen is injected.

A spacer 3 is arranged between the oil cylinder 1 and the air cylinder 4, the piston 13 is connected with a piston rod 2, the spacer 3 can separate an oil film on the piston rod 2 connected with the piston 13 in the oil cylinder, the oil film is prevented from entering the air cylinder 4 to volatilize and pollute air in the air cylinder, the piston rod 2 penetrates through the spacer 3, and a piston assembly 12 on the other end of the piston rod 2 is positioned in the air cylinder 4; two ends of the isolating piece 3 are respectively provided with a first sealing ring 20 and a second sealing ring 21, and the distance between the first sealing ring 20 and the second sealing ring 21 is larger than the maximum stroke of the piston 13, so that the piston rod 2 positioned in the oil cylinder 1 cannot enter the air cylinder 4 but enters the isolating piece 3 to realize isolation, and the purpose of physical isolation is achieved.

The isolating piece 3 is an isolating cylinder, the first sealing ring 20 is arranged on the isolating piece 3 or the air cylinder 4, and the second sealing ring 21 is arranged on the isolating piece 3 or the oil cylinder 1. According to the invention, the isolating piece 3 is connected with the oil cylinder 1 through the flange 7, the flange 7 can also be integrally arranged with the oil cylinder 1 or the air cylinder 4, and the sealing of two ends of the isolating piece 3 is ensured through the first sealing ring 20 and the second sealing ring 21.

The specific working mode of this embodiment is that the piston 13 in the oil cylinder 1 reciprocates left and right, thereby driving the piston assembly 12 in the cylinder 4 to reciprocate left and right, and realizing the process of re-exhausting after the high-pressure hydrogen is sucked. As shown in fig. 2, an air inlet 11 and an air outlet 10 are provided on the cylinder flange 8 at the end of the cylinder 4, when the piston 13 moves to the right, the cylinder 4 sucks in high-pressure hydrogen through the air inlet 11, when the piston 13 moves to the left, the cylinder 4 discharges the high-pressure hydrogen through the air outlet 10, and one-way valves are provided at both the air inlet 11 and the air outlet 10, thereby ensuring air intake and air discharge.

Example two

The difference from the above embodiment is that in this embodiment, one end of the cylinder 4 is connected with a circulating gas pipeline 5, a communication port between the circulating gas pipeline 5 and the cylinder 4 is arranged at one end close to the oil cylinder 1, and because the piston assembly 12 is in close contact with the inner wall of the cylinder 4, the piston assembly 12 divides the inside of the cylinder 4 into a left cavity and a right cavity; the circulating gas pipeline 5 is filled with inert positive pressure gas, and the inert positive pressure gas enables one end, close to the oil cylinder 1, in the air cylinder 4 to have positive pressure; the positive pressure gas is filled in the cavity close to one side of the oil cylinder 1, so that the oil mist in the isolating piece 3 can not enter the air cylinder 4, and gas phase isolation is formed. The inert positive pressure gas is filled through the circulating gas pipeline 5, namely, an inflation inlet communicated with the outside is arranged on the circulating gas pipeline 5, so that the inert gas is filled.

In the embodiment, the preferable inert positive pressure gas is nitrogen, and the pressure of the inert positive pressure gas is 0.1-1.0 MPa.

As shown in fig. 1, the circulating gas pipeline 5 is connected with the partition 3, an air passage 6 is arranged on the partition 3, and the circulating gas pipeline 5 is communicated with the cylinder 4 through the air passage 6.

EXAMPLE III

The difference from the above embodiment is that the number of the cylinders 4 is two, two cylinders 4 are symmetrically arranged on two sides of the oil cylinder 1, and the two cylinders 4 are communicated with each other through a circulating gas pipeline 5.

When the air outlet device works, the left air cylinder 4 and the right air cylinder 4 (corresponding to the directions of the upper side and the lower side in the figure 1) work in a cooperative mode, and the air outlets 10 of the left air cylinder 4 and the right air cylinder 4 are connected with the same air outlet pipe, so that continuous air outlet can be realized in the air outlet pipe when the piston 13 moves. As shown in fig. 1, the specific operation mode is that when the piston 13 moves to the left, nitrogen is filled into the left cylinder 4, so that positive pressure is generated in the left cylinder, at this time, the left cylinder 4 is vented, and the right cylinder 4 is aspirated; when the piston 13 moves rightwards, nitrogen is filled into the cylinder 4 on the right side, positive pressure is generated in the cylinder on the right side, the cylinder 4 on the right side is exhausted at the moment, the cylinder 4 on the left side is inhaled, circulation is repeatedly formed, and oil liquid and oil mist are prevented from entering the cylinder 4.

The circulating gas pipeline 5 is provided with an inflation inlet through which inert gas can be inflated into the cylinder 4, and a pressure sensor or a pressure gauge can be arranged at the inflation inlet, so that when the pressure rises, the sealing of the piston in the cylinder 4 is possibly failed, and high-pressure hydrogen is leaked; when the pressure decreases, indicating a failure of the seal between the cylinder 4 and the partition 3, nitrogen gas leaks.

Example four

The difference from the above embodiment is that a gas leakage detector 24 and an oil discharge port 25 are provided on the separator 3, a detection end of the gas leakage detector 24 is provided inside the separator 3, and the oil discharge port 25 is provided on a path through which oil flows.

In this embodiment, it is preferable to arrange the gas leak detector 24 above the separator 3, so that if the front end seal (cylinder 4 side) fails, the gas leaking from the inside of the separator chamber is monitored in real time by sensor communication. The oil discharge port 25 is provided below the partition 3, and if the rear end seal (the cylinder 1 side) fails, hydraulic oil leaks through the oil discharge port to be observed by a user. The arrangement of the gas leakage detector 24 and the oil discharge port 25 can help a user to find problems in time and maintain the oil leakage detector quickly.

EXAMPLE five

The present embodiment may include the first to fourth embodiments, and an implementation manner that is superior to the first to fourth embodiments is that, as shown in fig. 2, the piston assembly 12 is disposed separately from the piston rod 2, the piston assembly 12 includes a piston head 26, a piston body 27 and a piston tail cap 28, guide rings 29 are disposed on the piston body 27 and the piston tail cap 28, the two guide rings 29 are disposed to provide a supporting force for the piston assembly 12 and are coaxial with the cylinder 4, and the guide rings 29 protrude from the circumferential surface of the piston assembly 12; a seal ring 30 is disposed on the piston assembly 12.

An end flange 9 is arranged at the end part of the cylinder 4, the end flange 9 is connected with a cylinder flange 8, and when the piston assembly 12 is installed, the end flange is opened and directly disassembled and assembled.

The piston tail cover 28 is provided with a groove 31, and the groove 31 is matched with the end part of the piston rod 2 and provides a guiding effect for the movement of the piston rod 2; the diameter of one end of the piston head 26 is smaller than the diameter of the piston body 27 so that the piston head 26 does not obstruct the movement of the piston assembly 12.

When the one-way valve at the air inlet 11 is opened, hydrogen with pressure is sucked into the front end of the air cylinder 4, and at the moment, the piston assembly 12 is subjected to axial thrust in the air cylinder 4, so that the piston assembly is forced to cling to the end part of the piston rod 2 and then synchronously move backwards; when the piston moves reversely, the one-way valve at the air inlet 11 is closed, the one-way valve at the air outlet 10 is opened, the piston rod 2 gives reverse axial thrust, and the piston assembly 12 is pushed to discharge compressed hydrogen in the gas compression cavity, so that a reciprocating stroke movement is realized.

In this embodiment, the pressure at the air inlet 11 is preferably greater than 1.5MPa, so that the air inlet is forced to move backwards synchronously close to the end of the piston rod 2, thereby ensuring that the piston rod 2 does not generate noise of impacting the piston assembly in the working process.

EXAMPLE six

The present embodiment may include the first to fifth embodiments, and an implementation manner better than the first to fifth embodiments is that, as shown in fig. 3, a buffer cavity 16 is disposed at an end portion inside the oil cylinder 1, that is, the buffer cavity 16 is disposed on the flange 7 connected to the oil cylinder 1, the buffer cavity 16 is adapted to the piston 13, the piston 13 is configured to have a structure with a large middle and two small ends, that is, the diameter in the middle of the piston 13 is equivalent to the inner diameter of the oil cylinder 1, the diameters of the two ends of the piston 13 are smaller than the diameter in the middle of the piston 13, a section with the smaller diameters of the two ends of the piston 13 forms a buffer section 19, and the buffer section 19 is adapted to the buffer cavity 16; when the distance between the buffer section 19 and the buffer cavity 16 is closer and closer, the buffer section 19 enters the buffer cavity 16, at the moment, hydraulic oil is extruded, and the extruded hydraulic oil can only pass through a clearance (a clearance between the buffer section 19 and the buffer cavity 16) after matching, so that the oil discharge resistance is increased, and the purpose of buffering is achieved.

The further technical scheme is that the buffer cavity 16 is communicated with the interior of the oil cylinder 1 through an oil path 18. The position of the oil path 18 communicated with the buffer cavity 16 is arranged on one side far away from the piston 13, and a throttle valve group 17 is arranged on the oil path 18; the throttle valve group 17 is convenient for controlling the hydraulic oil flow area, so as to adjust the flow rate and better assist in adjusting the buffering speed of the piston 13.

The further technical scheme is that a proximity switch assembly 14 is arranged on the oil cylinder 1, and a sensing end 15 on the proximity switch assembly 14 is arranged in a buffer cavity 16. The position of the sensing area of the proximity switch assembly 14 is adjusted so as to realize the reversing action after the stroke of the oil cylinder piston 13 is in place.

When the right cavity of the oil cylinder 1 starts to be filled with oil and pushes the oil cylinder piston 13 to move leftwards at a speed V, hydraulic oil in the left cavity of the oil cylinder 1 is discharged into the oil cylinder 1 from the oil way 18 on the flange 7, after the cylindrical buffer section 19 is inserted into the buffer cavity 16, the hydraulic oil passes through the annular oil cavity gap, the flow area is reduced, the resistance is increased, the speed of the oil cylinder piston 13 is reduced to be V1, and at the moment, V1< V, the buffer is realized.

The oil cylinder piston 13 continues to move leftwards at a low speed after throttling, when the piston 13 is close to a head sensing area of the proximity switch assembly 14, namely a contact section 22 on the piston is close to the proximity switch assembly 14, a signal is given, a reversing signal is given, and at the moment, the distance between the piston 13 and the flange plate 7 is 3-4 mm; the diameter of the contact section 22 is smaller than that of the buffer section 19, but due to the inertia effect, the oil cylinder piston 13 will continue to decelerate for a certain distance, so when the proximity switch assembly 14 sends out a signal, a left and right inertia buffer distance is left between the piston 13 and the flange 7, the action of the piston 13 can be ensured, and the flange 7 can not be damaged due to long-term operation.

The buffering effect is observed and judged, and the size of the throttling area can be adjusted to match the optimal opening degree by matching with the manual control throttling valve group 17, so that the purpose of stable buffering is achieved.

The above embodiments are preferred embodiments, it should be noted that the above preferred embodiments should not be considered as limiting the invention, and the scope of protection of the invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and these modifications and adaptations should be considered within the scope of the invention.