A gas boost test system and method

Abstract

The application discloses a gas pressurization test system and method, relates to the technical field of gas pressurization, and provides the gas that needs to be pressurized to a high-pressure cavity of a gas pressurization device by a compressed gas source, provides low-pressure gas to a low-pressure cavity of the gas pressurization device by a low-pressure gas source, provides buffer medium to a buffer cavity of the gas pressurization device by a buffer medium source, and an electrical control and storage subsystem monitors the operation of the test system; during the pressurization test, the low-pressure gas in the low-pressure cavity drives the movement of a piston assembly, and the gas that needs to be pressurized in the high-pressure cavity is compressed; during the test, the electrical control and storage subsystem monitors the operation data, and processes and displays the monitored data. The double-tapered blocking ring lip-shaped sealing structure has a double sealing effect, one of which is to seal the piston and the piston cavity by two sealing lips of the lip-shaped sealing ring, and the other of which is to seal the piston and the piston cavity by the self-tightening double-tapered blocking ring to prevent the high-pressure medium from passing through the gap.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas pressurization, and more particularly to a gas pressurization test system and method. BACKGROUND

[0002] In some industrial applications, it is often necessary to use a pressurized gas supply system to provide high-pressure gas for equipment. For example, a pressurized gas supply system is used to reliably provide a heater device with high-pressure gas at room temperature with a maximum working pressure of about 100 MPa.

[0003] The pressurized gas supply system mainly consists of a gas pressurization device, a low-pressure gas source, a compressed gas source, valves, and pipelines. The gas pressurization device is the core component of the pressurized gas supply system and mainly includes a low-pressure cylinder and a pressurization cylinder. The pressurization cylinder bears extremely high pressure (such as 100 MPa as mentioned above), and the high-pressure sealing structure of the piston inside the pressurization cylinder is particularly important. If the sealing is not firm, the high-pressure gas inside the pressurization cylinder can easily enter the other side of the piston, causing sealing failure and affecting the operation of the gas pressurization device.

[0004] The piston in the cylinder of the gas pressurization device divides the internal cavity into a low-pressure cavity and a high-pressure cavity. The low-pressure cavity is filled with low-pressure gas provided by the low-pressure gas source, and the high-pressure cavity is filled with gas that needs to be pressurized provided by the compressed gas source. The low-pressure gas in the low-pressure cavity drives the piston to move, pressurizes the gas that needs to be pressurized in the high-pressure cavity, and makes the gas that needs to be pressurized reach the required pressure. However, when the piston moves to the upper limit position or the lower limit position, it will produce a large impact, and the piston will touch the cylinder wall, causing damage to the gas pressurization device.

[0005] In addition, for the gas pressurization device, how to test and verify that it can generate such high compressed gas, and monitor the pressure conditions of the low-pressure cavity and the high-pressure cavity, also need to be solved. SUMMARY

[0006] In order to overcome the defects existing in the above-mentioned prior art, the present invention discloses a gas pressurization test system and method. The purpose of the present invention is to solve the problems of piston sealing, piston touching and test verification existing in the above-mentioned prior art. In the present invention, the compressed gas source provides the gas that needs to be pressurized to the high-pressure chamber of the gas pressurization device, the low-pressure gas source provides low-pressure gas to the low-pressure chamber of the gas pressurization device, the buffer medium source provides buffer medium to the buffer chamber of the gas pressurization device, and the electrical control and storage subsystem monitors the operation of the test system; during the pressurization test, the low-pressure gas in the low-pressure chamber drives the piston assembly to move, compressing the gas that needs to be pressurized in the high-pressure chamber. During the test, the electrical control and storage subsystem monitors its operating data and processes and displays the monitored data to determine whether it reaches the required pressure. At the same time, a double-cone retaining ring lip sealing structure is provided to solve the sealing problem, and a buffer medium is provided to solve the piston touching problem.

[0007] In order to achieve the above objectives, the present invention adopts the following technical solutions:

[0008] A gas pressurization test system, comprising:

[0009] A gas booster device, comprising a low-pressure assembly, a high-pressure assembly, and a piston assembly, wherein the low-pressure assembly, the high-pressure assembly, and the piston assembly are respectively provided with a low-pressure cavity, a high-pressure cavity, and a buffer cavity. The low-pressure gas in the low-pressure cavity drives the piston assembly to move, compressing the gas to be pressurized in the high-pressure cavity. A double-cone retaining ring lip seal structure is provided between the piston of the piston assembly and the piston cavity for sealing the two.

[0010] A compressed gas source, the compressed gas source being connected to the high-pressure chamber of the gas boosting device through a first pipeline;

[0011] a low-pressure gas source, the low-pressure gas source being connected to the low-pressure chamber of the gas boosting device through a second pipeline;

[0012] a buffer medium source, the buffer medium source being connected to the buffer cavity of the gas boosting device through a third pipeline;

[0013] An electrical control and storage subsystem is connected to the gas boosting device, the first pipeline and the second pipeline respectively, monitors their operating data and processes and displays the monitored data.

[0014] Preferably, the high-pressure assembly and the low-pressure assembly are arranged up and down, and are both provided with a piston cavity therein and the two piston cavities are connected, and the inner diameter of the piston cavity of the high-pressure assembly is smaller than the inner diameter of the piston cavity of the low-pressure assembly; the piston assembly includes a low-pressure cylinder piston, a booster cylinder piston, and a piston connecting rod connecting the low-pressure cylinder piston and the booster cylinder piston, and the low-pressure cylinder piston and the booster cylinder piston are slidably assembled in the piston cavities in the low-pressure assembly and the high-pressure assembly respectively;

[0015] The piston cavity below the low-pressure cylinder piston forms the low-pressure cavity, the piston cavity between the low-pressure cylinder piston and the boost cylinder piston forms the buffer cavity, and the piston cavity above the boost cylinder piston forms the high-pressure cavity. The low-pressure cavity, the buffer cavity and the high-pressure cavity are all filled with flowing medium, and the side walls are all provided with medium inlet and outlet channels connected to the outside.

[0016] Preferably, the double-cone retaining ring lip sealing structure includes a lip sealing ring, upper and lower retaining rings and a middle retaining ring;

[0017] The top of the lip seal ring is provided with two sealing lips, and the two sealing lips are in contact with the booster cylinder piston and the side wall of the piston cavity to seal both respectively; a fixing groove is provided on the side wall of the booster cylinder piston, the lip seal ring is installed in the upper part of the fixing groove, and the upper and lower retaining rings and the middle retaining ring are installed in the lower part of the fixing groove;

[0018] The backs of the upper and lower retaining rings are against the piston of the booster cylinder, and the fronts of the upper and lower retaining rings are provided with tapered openings; the middle retaining ring is of a tapered structure and is embedded in the tapered opening, and the back of the middle retaining ring is against the side wall of the piston cavity;

[0019] Under the action of force, the upper and lower retaining rings and the middle retaining ring generate inward and outward forces respectively, pushing the upper and lower retaining rings and the middle retaining ring to move inward and outward respectively, eliminating and sealing the gap between the booster cylinder piston and the side wall of the piston cavity;

[0020] Grease is added to the sealing gap of the lip sealing ring, the lip sealing ring is made of perfluoroether rubber, and a pressure plate is arranged above the lip sealing ring. The pressure plate is detachably mounted next to the fixing groove through a mounting piece.

[0021] Preferably, the low-pressure assembly includes a low-pressure cylinder and a low-pressure cylinder cover, the low-pressure cylinder is passed through from top to bottom, the low-pressure cylinder cover is arranged at the bottom of the low-pressure cylinder, and the low-pressure cylinder cover is provided with a low-pressure gas inlet and outlet communicating with the low-pressure cavity;

[0022] The high-pressure assembly includes a booster cylinder and a booster cylinder cover. The booster cylinder is passed through from top to bottom. The booster cylinder cover is provided on the top of the booster cylinder. The booster cylinder cover is provided with a high-pressure gas inlet and outlet communicating with the high-pressure cavity.

[0023] The low-pressure cylinder and the boost cylinder are an integrated structure, and a buffer medium inlet and outlet communicating with the buffer cavity are provided thereon.

[0024] Preferably, the gas boosting device further comprises a detection component communicatively connected to the electrical control and storage subsystem, the detection component comprising a pressure sensor, a displacement sensor and a strain gauge;

[0025] The pressure sensor is installed on the low-pressure cylinder head and the boost cylinder head and inserted into the piston cavity. The displacement sensor is installed on the low-pressure cylinder head and inserted vertically upward into the low-pressure cylinder piston and piston connecting rod. The strain gauge is set on the low-pressure cylinder and the boost cylinder.

[0026] Preferably, the materials of the low-pressure cylinder, boost cylinder and boost cylinder cover are all 316LIV welded Monel K500, the material of the boost cylinder piston is Monel K500Ⅲ, the material of the low-pressure cylinder cover is S30408Ⅳ, the material of the low-pressure cylinder piston is S30408Ⅲ, and the material of the piston connecting rod is 16MnⅢ chrome-plated.

[0027] Preferably, the gas booster device and the buffer medium source are both installed on a skid seat, the buffer medium source is filled with buffer medium, and is connected to the buffer cavity of the gas booster device through a buffer medium inlet and outlet pipe, and delivers buffer medium to the buffer cavity to buffer the movement of the piston assembly, and the height of the buffer medium source is higher than the height of the buffer cavity.

[0028] Preferably, the skid seat is provided with a first skid frame and a second skid frame, the gas boosting device and the buffer medium source are respectively installed on the first skid frame and the second skid frame, and the two are arranged side by side; the buffer medium inlet and outlet pipes are installed with valves, pressure transmitters and throttle plates, and a boost gas leakage probe alarm is provided next to the gas boosting device;

[0029] The buffer medium inlet and outlet pipes include an inlet and outlet main pipe, an annular pipe and several branch pipes; one end of the inlet and outlet main pipe is connected to the buffer medium source, and the other end is connected to the annular pipe. The annular pipe is arranged in an annular shape on the outer side wall of the buffer cavity of the gas booster device, and is connected to the buffer cavity through the several branch pipes.

[0030] Preferably, the first pipeline is provided with a first exhaust port and a vacuum pumping device, and the second pipeline is provided with a second exhaust port.

[0031] Preferably, the pressure in the buffer cavity is:

[0032]

[0033] Where P is the pressure in the buffer chamber, F is the resultant force on the piston, and A is the area. is the initial velocity of the driving piston, k is the coefficient related to the specific gravity, viscosity and pressure relief hole of water, f is the area of ​​the pressure relief hole, L is the buffer stroke, m is the inertial mass.

[0034] Based on the above-mentioned gas pressurization test system, the present invention further provides a gas pressurization test method, comprising the following steps:

[0035] S1. Clean and degrease all pipelines, equipment and containers of the gas pressurization test system;

[0036] S2. Fill the high-pressure chamber and low-pressure chamber of the gas pressurization test system with nitrogen to check their air tightness, and perform a pressurization pre-test using nitrogen;

[0037] S3. Conduct a gas pressurization test using compressed gas;

[0038] S4. During the test, the low-pressure gas source provides nitrogen low-pressure gas to the low-pressure cavity, the compressed gas source provides the gas that needs to be pressurized to the high-pressure cavity, and the buffer medium source provides the buffer medium to the buffer cavity. The nitrogen low-pressure gas in the low-pressure cavity drives the piston assembly to move and compresses the gas that needs to be pressurized in the high-pressure cavity. The electrical control and storage subsystem monitors the operating data of the gas boosting device and each pipeline and processes and displays the monitored data.

[0039] Beneficial effects of the present invention:

[0040] The gas pressurization test system provided by the present invention comprises a compressed gas source providing the gas to be pressurized to the high-pressure cavity of the gas pressurization device, a low-pressure gas source providing low-pressure gas to the low-pressure cavity of the gas pressurization device, a buffer medium source providing buffer medium to the buffer cavity of the gas pressurization device, and an electrical control and storage subsystem monitoring the operation of the test system; during the pressurization test, the low-pressure gas in the low-pressure cavity drives the piston assembly to move, compressing the gas to be pressurized in the high-pressure cavity; during the test, the electrical control and storage subsystem monitors its operating data and processes and displays the monitored data to determine whether it has reached the required pressure.

[0041] The gas pressurization device in the gas pressurization test system provided by the present invention introduces gas to be pressurized into the high-pressure cavity, and continuously introduces low-pressure gas into the low-pressure cavity. The low-pressure gas drives the low-pressure cylinder piston to move upward, and the low-pressure cylinder piston then drives the boosting cylinder piston to move upward, compressing the gas inside the high-pressure cavity to reach the required pressure. At the same time, the buffer medium in the buffer cavity buffers the piston to prevent it from moving to the extreme position and causing a large impact.

[0042] The gas pressurizing device of the gas pressurization test system has a double-tapered check ring lip-shaped sealing structure arranged between the piston and the piston cavity of the piston assembly for sealing the piston and the piston cavity, and the double-tapered check ring lip-shaped sealing structure has a double sealing effect, one is to seal the piston and the piston cavity by two sealing lips of the lip-shaped sealing ring, and the other is to seal the piston and the piston cavity by self-tightening of the double-tapered check ring to eliminate the gap, thereby preventing the high-pressure medium from passing through the gap.

[0043] The gas pressurization test system has the gas pressurizing device and the buffer medium source installed on the skid, the buffer cavity for buffering the movement of the piston is arranged in the gas pressurizing device, the buffer medium is provided into the buffer cavity by the buffer medium source, the buffer medium buffers the movement of the piston, reduces the running speed of the piston, and prevents the piston from moving to the limit position to generate a large impact to damage the gas pressurizing device. The gas pressurization test system has the gas pressurizing device and the buffer medium source installed on the skid, the buffer cavity for buffering the movement of the piston is arranged in the gas pressurizing device, the buffer medium is provided into the buffer cavity by the buffer medium source, the buffer medium buffers the movement of the piston, reduces the running speed of the piston, and prevents the piston from moving to the limit position to generate a large impact to damage the gas pressurizing device. BRIEF DESCRIPTION OF DRAWINGS

[0044] Figure 1 It is a schematic diagram of the gas pressurization test system of the present application;

[0045] Figure 2 It is a schematic diagram of the gas pressurization test system of the present application;

[0046] Figure 3 It is a schematic diagram of the gas pressurization test system of the present application; Figure 2 It is a schematic diagram of the gas pressurization test system of the present application;

[0047] Figure 4 It is a schematic diagram of the gas pressurization test system of the present application;

[0048] Figure 5 It is a schematic diagram of the gas pressurization test system of the present application;

[0049] REFERENCE NUMERALS:

[0050] 1. Gas booster; 11. Low-pressure assembly; 111. Low-pressure cylinder; 112. Low-pressure cylinder cover; 113. Low-pressure gas inlet and outlet; 12. High-pressure assembly; 121. Booster cylinder; 122. Booster cylinder cover; 123. High-pressure gas inlet and outlet; 13. Piston assembly; 131. Low-pressure cylinder piston; 132. Booster cylinder piston; 133. Piston connecting rod; 134. Low-pressure chamber; 135. Buffer chamber; 136. High-pressure chamber; 137. Buffer medium inlet and outlet; 14. Double-cone retaining ring lip seal structure; 141. Lip seal Ring; 142, upper and lower retaining rings; 143, middle retaining ring; 144, pressure plate; 15, detection assembly; 151, pressure sensor; 152, displacement sensor; 2, skid seat; 21, first skid frame; 22, second skid frame; 3, buffer medium source; 31, buffer medium inlet and outlet pipes; 311, inlet and outlet main pipe; 312, annular pipe; 313, branch pipe; 32, valve; 33, pressure transmitter; 34, throttle plate; 4, pressurized gas leakage probe alarm; 5, compressed gas source; 6, low-pressure gas source; 7, electrical control and storage subsystem.

[0051] Figure 1 middle:

[0052] DETAILED DESCRIPTION

[0053] The following will provide a clear and complete description of the concept, specific structure and technical effects of the present invention in conjunction with the embodiments and drawings, so as to fully understand the purpose, features and effects of the present invention.

[0054] Example 1

[0055] A gas pressurization test system, such as Figure 1 、 2 and 4, including:

[0056] The gas booster device 1 includes a low-pressure component 11, a high-pressure component 12, and a piston component 13. A low-pressure chamber 134, a high-pressure chamber 136, and a buffer chamber 135 are respectively provided in the low-pressure component 11, the high-pressure component 12, and the piston component 13. The low-pressure gas in the low-pressure chamber 134 drives the piston component 13 to move, compressing the gas to be pressurized in the high-pressure chamber 136. A double-cone retaining ring lip seal structure 14 is provided between the piston of the piston component 13 and the piston chamber for sealing the two.

[0057] The compressed gas source 5 is connected to the high-pressure chamber 136 of the gas boosting device 1 through a first pipeline;

[0058] A low-pressure gas source 6 is connected to the low-pressure chamber 134 of the gas boosting device 1 through a second pipeline;

[0059] A buffer medium source 3, the buffer medium source 3 is connected to the buffer chamber 135 of the gas boosting device 1 through a third pipeline;

[0060] The electrical control and storage subsystem 7 is connected to the gas boosting device 1, the first pipeline and the second pipeline respectively, monitors their operating data and processes and displays the monitored data.

[0061] In this embodiment, the compressed gas source 5 provides the gas to be pressurized to the high-pressure chamber 136 of the gas booster 1, the low-pressure gas source 6 provides low-pressure gas to the low-pressure chamber 134 of the gas booster 1, and the buffer medium source 3 provides buffer medium to the buffer chamber 135 of the gas booster 1. The electrical control and storage subsystem 7 monitors the operation of the test system. During the pressurization test, the low-pressure gas in the low-pressure chamber 134 drives the piston assembly 13 to move, compressing the gas to be pressurized in the high-pressure chamber 136. During the test, the electrical control and storage subsystem 7 monitors its operating data, processes, and displays the monitored data to determine whether the required pressure has been reached.

[0062] The piston of piston assembly 13 is subjected to high pressure during movement. This embodiment employs a double-cone retaining ring lip seal structure 14 on its sidewall. The two sealing lips of the lip seal seal seal the piston and piston cavity, while the double-cone retaining ring self-tightens to eliminate gaps and prevent the passage of media.

[0063] Example 2

[0064] This embodiment is further described on the basis of embodiment 1. Figure 2 As shown, the high-pressure component 12 and the low-pressure component 11 are arranged up and down, and a piston cavity is provided inside each of them and the two piston cavities are connected. At the same time, the inner diameter of the piston cavity of the high-pressure component 12 is smaller than the inner diameter of the piston cavity of the low-pressure component 11; the piston assembly 13 includes a low-pressure cylinder piston 131, a booster cylinder piston 132, and a piston connecting rod 133 connecting the low-pressure cylinder piston 131 and the booster cylinder piston 132. The low-pressure cylinder piston 131 and the booster cylinder piston 132 are respectively slidably assembled in the piston cavities in the low-pressure component 11 and the high-pressure component 12.

[0065] The piston cavity below the low-pressure cylinder piston 131 forms a low-pressure cavity 134, the piston cavity between the low-pressure cylinder piston 131 and the boost cylinder piston 132 forms a buffer cavity 135, and the piston cavity above the boost cylinder piston 132 forms a high-pressure cavity 136. The low-pressure cavity 134, the buffer cavity 135 and the high-pressure cavity 136 are all filled with flowing medium, and the side walls are all provided with medium inlet and outlet channels connected to the outside.

[0066] In this embodiment, low-pressure gas is introduced into the low-pressure chamber 134, a buffer medium is introduced into the buffer chamber 135, and gas to be pressurized is introduced into the high-pressure chamber 136. By continuously introducing low-pressure gas into the low-pressure chamber 134, the low-pressure gas drives the low-pressure cylinder piston 131 upward, which in turn drives the piston connecting rod 133 upward. The piston connecting rod 133 in turn drives the booster cylinder piston 132 upward, compressing the gas within the high-pressure chamber 136 to the desired pressure.

[0067] In this embodiment, the inner diameter of the piston cavity of high-pressure assembly 12 is smaller than that of low-pressure assembly 11. During compression and boosting, the volume of buffer cavity 135 decreases, causing the buffer medium to flow back outward. A valve can be installed in the outward return line to control the valve opening to limit the return flow of the buffer medium. This, in turn, controls the buffering force of the buffer medium in buffer cavity 135 on the piston, achieving the purpose of piston buffering and deceleration. The buffer medium in buffer cavity 135 cushions the piston, preventing it from moving to its extreme position and causing a large impact.

[0068] Example 3

[0069] This embodiment is further elaborated on the basis of embodiment 2. There are two main structural forms of high-pressure sealing structures in the prior art. One is the sealing structure of Trelleborg Seals under extremely high pressure. The two retaining rings at the rear of this structure cannot be tightly attached to the cover, and a gap is easily generated. The front lip sealing ring is easily pressed into the gap of the retaining ring, resulting in a stuck phenomenon. The elastic lip of the lip sealing ring is thin and easily deformed when connected to the rear end. The other is the Che Hengde sealing structure, the main structure of which is an O-ring plus a slip ring combined seal. The O-ring of this structure is easily deformed and extruded, and the slip ring material is PTFE. It is not easy to achieve sealing at the molecular level.

[0070] The Ster seal is also a common high-pressure sealing structure. It consists of an O-ring and a PTFE ring. The O-ring provides the sealing force. When pressure is zero, the pre-deformed elastic force of the O-ring acts on the PTFE ring to generate the sealing force. When pressure is applied, the gas pressure acts on the O-ring, compressing it and increasing the sealing force of the PTFE ring. The higher the pressure, the more reliable the seal. PTFE also has a certain self-lubricating property.

[0071] There is limited literature on the selection and structure of ultra-high-pressure seal materials. Among the available literature, Fan Xing et al. used ABAQUS software to build a two-dimensional axisymmetric model of the Y-shaped seal structure (rubber ring and metal ring) used in a warm isostatic pressing (WIP) forming system. They analyzed the contact stress variations at pressures of 0, 50, 100, 150, and 200 MPa. Sealing tests were conducted in the WIP forming system. The seal structure achieved a leak-free seal at 300°C and 200 MPa, with no oil leakage, even after a 10-minute pressure hold. Zhao Minmin et al. used ANSYS, a finite element analysis software, to build a two-dimensional axisymmetric model of a Y-shaped seal ring used in the piston rod of a 20-ton excavator bucket cylinder. The contact pressure at the contact surface was measured at an oil pressure of 34.3 MPa. Wang Gang et al. analyzed the deformation and maximum contact stress of a Y-shaped seal ring used in a hydraulic support under conditions of 0-31.5 MPa. Du Jiaxi et al. used finite element analysis to analyze the sealing characteristics of the Y-shaped seal for the hydraulic cylinder piston rod in dynamic and static sealing states, with a pressure range of 0-30MPa.

[0072] This embodiment provides a double-cone retaining ring lip seal structure 14 based on the advantages of Trelleborg's ultra-high pressure seal structure and Che Hengde's seal structure, as well as the existing high-pressure Y-shaped seal structure. Figure 2 and 3 As shown, the details are as follows:

[0073] A double-cone retaining ring lip seal structure 14 is provided between the booster cylinder piston 132 and the piston cavity for sealing the two. The double-cone retaining ring lip seal structure 14 includes a lip seal ring 141 , upper and lower retaining rings 142 and a middle retaining ring 143 .

[0074] Two sealing lips are provided on the top of the lip sealing ring 141, and the two sealing lips contact and seal the booster cylinder piston 132 and the side wall of the piston cavity respectively; a fixing groove is provided on the side wall of the booster cylinder piston 132, and the lip sealing ring 141 is installed in the upper part of the fixing groove, and the upper and lower retaining rings 142 and the middle retaining ring 143 are installed in the lower part of the fixing groove.

[0075] The backs of the upper and lower retaining rings 142 are against the booster cylinder piston 132, and the fronts of the upper and lower retaining rings 142 are provided with tapered openings; the middle retaining ring 143 has a tapered structure and is embedded in the tapered opening, and the back of the middle retaining ring 143 is against the side wall of the piston cavity.

[0076] Under the action of force, the upper and lower retaining rings 142 and the middle retaining ring 143 generate inward and outward forces respectively, pushing the upper and lower retaining rings 142 and the middle retaining ring 143 to move inward and outward respectively, eliminating and sealing the gap between the booster cylinder piston 132 and the side wall of the piston cavity.

[0077] Grease is added to the sealing gap of the lip seal ring 141. The lip seal ring 141 is made of perfluoroether rubber. A pressure plate 144 is provided above the lip seal ring 141. The pressure plate 144 is detachably mounted next to the fixing groove through a mounting piece.

[0078] In this embodiment, the booster cylinder piston 132 is subjected to high pressure during movement. This embodiment employs a double-cone retaining ring lip seal structure 14 provided on its sidewall. The two sealing lips of the lip seal seal seal the booster cylinder piston 132 and the piston cavity. The double-cone retaining ring self-tightens to eliminate gaps and prevent the passage of media through the gap.

[0079] Specifically, the lip seal 141 is designed with two sealing lips, and grease is added to the sealing gap to maintain additional lubrication, reduce dry friction and wear, and extend the service life of the seal. At the same time, the back of the lip seal adopts a self-tightening gap elimination sealing structure design. The working principle of this structure is based on the force of air pressure acting on the lip seal 141 to push the upper and lower retaining rings 142 and the middle retaining ring 143. Since the joint surfaces of the upper and lower retaining rings 142 and the middle retaining ring 143 are conical structures, under the action of force, the upper and lower retaining rings 142 and the middle retaining ring 143 respectively generate inward and outward forces, eliminating the gap and playing a certain sealing role. Perfluoroether rubber has low elasticity and cannot be installed in the fixing groove during assembly. A pressure plate 144 design structure is adopted. The pressure plate 144 is fixed with a hexagon socket screw, and a spring washer is used between the pressure plate 144 and the hexagon socket screw to prevent loosening.

[0080] The double-cone retaining ring of the double-cone retaining ring lip seal structure 14 of this embodiment refers to the conical openings of the upper and lower retaining rings 142 (one-cone retaining ring) and the conical structure of the middle retaining ring 143 (two-cone retaining ring).

[0081] In this embodiment, a sealing structure is also provided between the low-pressure cylinder piston 131 and the piston cavity. The sealing structure may be the above-mentioned double-cone retaining ring lip sealing structure or a conventional sealing structure.

[0082] Example 4

[0083] This embodiment is further described on the basis of embodiment 3. Figure 2 As shown, the low-pressure assembly 11 includes a low-pressure cylinder 111 and a low-pressure cylinder head 112. The low-pressure cylinder 111 extends vertically, and the low-pressure cylinder head 112 is located at the bottom of the low-pressure cylinder 111. The low-pressure cylinder head 112 is provided with a low-pressure gas inlet and outlet 113 that communicates with a low-pressure cavity 134. In this embodiment, low-pressure gas is introduced into the low-pressure gas inlet and outlet 113, and enters the low-pressure cavity 134 within the low-pressure cylinder 111, driving the low-pressure cylinder piston 131 within the low-pressure cylinder 111 to move upward, thereby driving the booster cylinder piston 132 to compress the gas.

[0084] like Figure 2As shown, the high-pressure assembly 12 includes a booster cylinder 121 and a booster cylinder head 122. The booster cylinder 121 extends vertically through the booster cylinder 121, and the booster cylinder head 122 is located on the top of the booster cylinder 121. The booster cylinder head 122 is provided with a high-pressure gas inlet and outlet 123 that communicates with a high-pressure chamber 136. In this embodiment, gas to be pressurized is introduced into the high-pressure gas inlet and outlet 123, and the gas to be pressurized enters the high-pressure chamber 136. Under the movement of the booster cylinder piston 132, the volume of the high-pressure chamber 136 decreases, thereby pressurizing the gas to be pressurized to the desired pressure and then being discharged from the high-pressure gas inlet and outlet 123.

[0085] like Figure 2 As shown, the low-pressure cylinder 111 and the boost cylinder 121 are integrally formed, and are provided with a buffer medium inlet and outlet 137 that communicates with the buffer chamber 135. In this embodiment, by introducing buffer medium into the buffer medium inlet and outlet 137, the buffer medium enters the buffer chamber 135, where it cushions the movement of the piston, preventing it from moving to its extreme position and causing significant impact damage to the device.

[0086] In this embodiment, multiple low-pressure gas inlet and outlet 113, high-pressure gas inlet and outlet 123, and buffer medium inlet and outlet 138 are provided for the entry and exit of media. Valves are provided on the connecting pipes to control the entry of media into the chambers. Furthermore, the piston can be returned downward by introducing gas into the high-pressure chamber 136.

[0087] Example 5

[0088] This embodiment is further described on the basis of embodiment 4. Figure 2 As shown, the gas boosting device 1 further includes a detection component 15 communicatively connected to the electrical control and storage subsystem 7 , and the detection component 15 includes a pressure sensor 151 , a displacement sensor 152 and a strain gauge.

[0089] The pressure sensor 151 is installed on the low-pressure cylinder head 112 and the boost cylinder head 122 and inserted into the piston cavity. The displacement sensor 152 is installed on the low-pressure cylinder head 112 and inserted vertically upward into the low-pressure cylinder piston 131 and the piston connecting rod 133. The strain gauge is set on the low-pressure cylinder 111 and the boost cylinder 121.

[0090] In this embodiment, the pressure sensor 151 is used to detect the pressure of the medium inside the low-pressure chamber 134 and the high-pressure chamber 136. The displacement sensor 152 is used to detect the displacement of the piston. The strain gauge is used to detect the strain of the low-pressure cylinder 111 and the boost cylinder 121.

[0091] In this embodiment, the low-pressure gas introduced into the low-pressure cavity 134 is nitrogen, the medium introduced into the buffer cavity 135 is buffer water, and the gas that needs to be pressurized is introduced into the high-pressure cavity 136 .

[0092] Example 6

[0093] This embodiment further elaborates on the basis of Example 5. The materials of the low-pressure cylinder 111, the boosting cylinder 121 and the boosting cylinder cover 122 are all 316LIV cladding Monel K500, the material of the boosting cylinder piston 132 is Monel K500Ⅲ, the material of the low-pressure cylinder cover 112 is S30408Ⅳ, the material of the low-pressure cylinder piston 131 is S30408Ⅲ, and the material of the piston connecting rod 133 is 16MnⅢ chrome-plated.

[0094] The booster cylinder operates with 100MPa extremely high-pressure gas. Conventional materials, such as stainless steel, will burn and fail at temperatures above CL2000. To prevent combustion at high temperatures, Monel K500 is welded onto the inner surface of the booster cylinder. Monel alloy has an operating temperature range of -29°C to 480°C. Its excellent flame retardancy, high immunity pressure, and excellent mechanical properties in high-pressure and extremely high-pressure gases make it widely used in the manufacture of high-pressure and extremely high-pressure gas valves and equipment. This is particularly true for high-pressure and extremely high-pressure gas pipelines and equipment in aviation and aerospace systems.

[0095] Compared with gun steel, which is a high-carbon steel, austenitic stainless steel materials such as 316L, F321 and 304 stainless steel have better oxidation resistance and welding performance than gun steel, and the fracture toughness of the material is comparable to that of gun steel, and the overall performance is better than gun steel. Therefore, 316L austenitic stainless steel is used as the material for the cylinder block and cylinder head, and Monel K500 alloy is welded on the inner surface of the cylinder body. The welding process adopts laser cladding welding.

[0096] Example 7

[0097] This embodiment further elaborates on the basis of Example 6. The movement speed of the gas booster device can reach 0.5m / s. The moving parts are of large mass. In order to avoid cylinder collision and reduce the stress of the low-pressure cylinder and the booster cylinder, the cylinder booster and return stroke are designed with buffer devices to achieve flexible collision of the piston. When the piston moves, a closed buffer chamber is formed. The buffer medium in the buffer chamber can only be discharged through the outlet. When the outlet opening is very small, the pressure in the chamber rises rapidly, which will generate a reaction force on the piston, thereby slowing the piston down until it stops.

[0098] When the low-pressure cylinder valve is opened and filled with nitrogen, the piston moves upward under the pressure of nitrogen, the buffer pressure of the buffer chamber water, and the friction force of the inner wall of the low-pressure cylinder. The force balance equation of the driving piston can be expressed as:

[0099]

[0100] Where: P is the pressure of the water in the buffer chamber, MPa; F is the resultant force on the piston; m is the inertial mass, kg; a is the piston acceleration, m / s².

[0101] The low-pressure cylinder buffer chamber conforms to the flow characteristics of the thick-walled pressure relief hole. According to the pressure relief hole flow equation:

[0102]

[0103] Where: f is the area of ​​the pressure relief hole, m²; k is a coefficient related to water specific gravity, viscosity and pressure relief hole.

[0104] Driving piston motion velocity equation:

[0105]

[0106] Where: is the initial velocity of the driving piston, m / s; L is the buffer stroke, m.

[0107] According to the pressure relief hole flow equation and the driving piston motion velocity equation, the acceleration equation can be obtained:

[0108]

[0109] The area of ​​the pressure relief hole of the buffer chamber is:

[0110]

[0111] The buffer cavity pressure equation is obtained:

[0112] .

[0113] In this embodiment, by obtaining the pressure equation of the buffer cavity, the pressure of the buffer cavity during operation is obtained, thereby designing and studying the buffer cavity.

[0114] Example 8

[0115] This embodiment is further described on the basis of embodiment 7. Figure 4 and 5 As shown, the gas booster device 1 and the buffer medium source 3 are both installed on the skid 2. The buffer medium source 3 is filled with buffer medium and is connected to the buffer cavity 135 of the gas booster device 1 through the buffer medium inlet and outlet pipe 31, and the buffer medium is transported to the buffer cavity 135 to buffer the movement of the piston assembly 13. The height of the buffer medium source 3 is higher than the height of the buffer cavity 135.

[0116] In this embodiment, the gas boosting device 1 and the buffer medium source 3 are both installed on the skid seat 2, which is convenient for transferring them together; at the same time, the height of the buffer medium source 3 is higher than the height of the buffer cavity 135, and the buffer medium in the buffer medium source 3 can flow into the buffer cavity 135 due to gravity, thereby buffering the movement of the piston, and no additional power is required to transport the buffer medium.

[0117] like Figure 4 and 5 As shown, the skid 2 is provided with a first skid frame 21 and a second skid frame 22, and the gas boosting device 1 and the buffer medium source 3 are respectively installed on the first skid frame 21 and the second skid frame 22, and the two are arranged side by side. A valve 32, a pressure transmitter 33 and a throttle plate 34 are installed on the buffer medium inlet and outlet pipe 31. The valve 32 is used to control the opening and closing and the opening degree of the buffer medium inlet and outlet pipe 31. The pressure transmitter 33 is used to detect the pressure of the buffer medium in the buffer medium inlet and outlet pipe 31. The throttle plate 34 is used to throttle the buffer medium. A boost gas leakage probe alarm 4 is provided next to the gas boosting device 1. When a gas leakage that needs to be boosted is detected, an alarm is immediately sounded to remind relevant staff.

[0118] like Figure 4 and 5 As shown, the buffer medium inlet and outlet pipe 31 includes an inlet and outlet main pipe 311, an annular pipe 312, and a plurality of branch pipes 313. One end of the inlet and outlet main pipe 311 is connected to the buffer medium source 3, and the other end is connected to the annular pipe 312. The annular pipe 312 is arranged in an annular shape on the outer wall of the buffer cavity 135 of the gas booster device 1 and communicates with the buffer cavity 135 through the plurality of branch pipes 313. During use, the buffer medium in the buffer medium source 3 first enters the inlet and outlet main pipe 311, then enters the annular pipe 312, and finally enters the buffer cavity 135 through the plurality of branch pipes 313.

[0119] like Figure 1 As shown, the first pipeline is provided with a first exhaust port and a vacuum pumping device for exhausting and vacuuming, and the second pipeline is provided with a second exhaust port for exhausting.

[0120] Example 9

[0121] A gas pressurization test method comprises the following steps:

[0122] S1. Clean and degrease all pipelines, equipment and containers of the gas pressurization test system;

[0123] In the above steps, all pipeline equipment containers are cleaned and degreased before the test. Degreasing is an important process to ensure the safe operation of the booster cylinder. When gas and combustible materials are mixed and there is an excitation energy, that is, when the "three elements" are present at the same time, serious consequences such as combustion or explosion will occur. The degreasing operation is to remove the inherent grease and combustible materials inside the pipeline project from the perspective of installation and construction to the greatest extent possible, and to minimize the entry of combustible materials such as grease and particles into the system during the construction process, thereby reducing the safety risks of the gas pipeline project. Carbon tetrachloride, which has a relatively good degreasing effect, is used as a degreasing agent, and the booster cylinder is degreased using a segmented convection circulation method.

[0124] S2. Fill the high-pressure chamber and low-pressure chamber of the gas pressurization test system with nitrogen to check their air tightness, and perform a pressurization pre-test using nitrogen;

[0125] S3. Conduct a gas pressurization test using compressed gas;

[0126] S4. During the test, the low-pressure gas source provides nitrogen low-pressure gas to the low-pressure cavity, the compressed gas source provides the gas that needs to be pressurized to the high-pressure cavity, and the buffer medium source provides the buffer medium to the buffer cavity. The nitrogen low-pressure gas in the low-pressure cavity drives the piston assembly to move and compresses the gas that needs to be pressurized in the high-pressure cavity. The electrical control and storage subsystem monitors the operating data of the gas boosting device and each pipeline and processes and displays the monitored data.

[0127] In step S4, when the gas is pressurized, low-pressure gas is continuously introduced into the low-pressure chamber 134. The low-pressure gas increases the volume and pressure of the low-pressure chamber 134, thereby driving the low-pressure cylinder piston 131 to move upward. The low-pressure cylinder piston 131 then drives the piston connecting rod 133 to move upward, and the piston connecting rod 133 then drives the boosting cylinder piston 132 to move upward, causing the volume of the high-pressure chamber 136 to decrease and the pressure to increase. The gas inside the high-pressure chamber 136 is compressed to reach the required pressure and then discharged from the high-pressure gas inlet and outlet 123.

[0128] In step S4, the buffer water in the buffer medium source 3 first enters the inlet and outlet main pipe 311, then enters the annular pipe 312, and finally enters the buffer cavity 135 through a number of branch pipes 313 and a number of buffer medium inlets and outlets 138. During pressurization, the buffer water in the buffer cavity 135 buffers the movement of the piston to prevent it from moving too fast and causing a large impact when it moves to the extreme position. At the same time, the volume of the buffer cavity 135 is reduced, and the buffer water flows back to the buffer medium source 3 through a number of buffer medium inlets and outlets 138, a number of branch pipes 313, annular pipe 312, and the inlet and outlet main pipe 311. The reflux flow of the buffer water can be limited by setting the opening of the valve on the pipeline, and the pressure of the buffer water can be controlled, that is, the buffering force of the buffer water in the buffer cavity 135 on the piston can be controlled to achieve the purpose of piston buffering and deceleration.

[0129] In step S4, when in use, the pressure inside the high-pressure chamber 136 is relatively high, and the double-cone retaining ring lip seal structure 14 performs a double seal on the booster cylinder piston 132. First, the two sealing lips of the lip seal ring 141 seal the booster cylinder piston 131 and the piston chamber. Second, the upper and lower retaining rings 142 and the middle retaining ring 143 self-tighten to eliminate the gap, sealing the booster cylinder piston 132 and the piston chamber, thereby preventing the high-pressure gas in the high-pressure chamber 136 from entering the buffer chamber 135 through the gap.

[0130] The above is a detailed description of the embodiments of the present invention, but the present invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without departing from the spirit of the present invention. These equivalents or substitutions are all included in the scope defined by the claims of the present invention.

Claims

1. A gas pressurization test system, characterized in that: include: A gas boosting device (1), the gas boosting device (1) comprising a low-pressure component (11), a high-pressure component (12) and a piston component (13), wherein the low-pressure component (11), the high-pressure component (12) and the piston component (13) are respectively provided with a low-pressure cavity (134), a high-pressure cavity (136) and a buffer cavity (135), the low-pressure gas in the low-pressure cavity (134) drives the piston component (13) to move, compressing the gas to be boosted in the high-pressure cavity (136), and a double-cone retaining ring lip seal structure (14) for sealing the piston and the piston cavity of the piston component (13); A compressed gas source (5), the compressed gas source (5) being connected to the high-pressure chamber (136) of the gas boosting device (1) via a first pipeline; A low-pressure gas source (6), the low-pressure gas source (6) being connected to the low-pressure cavity (134) of the gas boosting device (1) via a second pipeline; a buffer medium source (3), the buffer medium source (3) being connected to the buffer cavity (135) of the gas boosting device (1) via a third pipeline; an electrical control and storage subsystem (7), the electrical control and storage subsystem (7) being connected to the gas boosting device (1), the first pipeline, and the second pipeline, respectively, monitoring their operating data and processing and displaying the monitored data; The high-pressure assembly (12) and the low-pressure assembly (11) are arranged up and down, and a piston cavity is provided inside each of them and the two piston cavities are connected. At the same time, the inner diameter of the piston cavity of the high-pressure assembly (12) is smaller than the inner diameter of the piston cavity of the low-pressure assembly (11); the piston assembly (13) includes a low-pressure cylinder piston (131), a booster cylinder piston (132), and a piston connecting rod (133) connecting the low-pressure cylinder piston (131) and the booster cylinder piston (132), and the low-pressure cylinder piston (131) and the booster cylinder piston (132) are slidably assembled in the piston cavities of the low-pressure assembly (11) and the high-pressure assembly (12), respectively. The piston cavity below the low-pressure cylinder piston (131) forms the low-pressure cavity (134), the piston cavity between the low-pressure cylinder piston (131) and the boosting cylinder piston (132) forms the buffer cavity (135), and the piston cavity above the boosting cylinder piston (132) forms the high-pressure cavity (136). The low-pressure cavity (134), the buffer cavity (135), and the high-pressure cavity (136) are all filled with flowing medium, and the side walls are all provided with medium inlet and outlet channels communicating with the outside. The double-cone retaining ring lip seal structure (14) comprises a lip seal ring (141), upper and lower retaining rings (142) and a middle retaining ring (143); Two sealing lips are provided on the top of the lip seal ring (141), and the two sealing lips are in contact with the booster cylinder piston (132) and the side wall of the piston cavity to seal both respectively; a fixing groove is provided on the side wall of the booster cylinder piston (132), the lip seal ring (141) is installed in the upper part of the fixing groove, and the upper and lower retaining rings (142) and the middle retaining ring (143) are installed in the lower part of the fixing groove; The backs of the upper and lower retaining rings (142) abut against the booster cylinder piston (132), and the fronts of the upper and lower retaining rings (142) are provided with tapered openings; the middle retaining ring (143) has a tapered structure and is embedded in the tapered opening, and the back of the middle retaining ring (143) abuts against the side wall of the piston cavity; Under the action of the force, the upper and lower retaining rings (142) and the middle retaining ring (143) respectively generate inward and outward forces, pushing the upper and lower retaining rings (142) and the middle retaining ring (143) to move inward and outward respectively, thereby eliminating and sealing the gap between the booster cylinder piston (132) and the side wall of the piston cavity; Lubricating grease is added to the sealing gap of the lip seal ring (141), the lip seal ring (141) is made of perfluoroether rubber, and a pressing plate (144) is provided above the lip seal ring (141), and the pressing plate (144) is detachably mounted next to the fixing groove through a mounting member.

2. The gas pressurization test system according to claim 1, characterized in that: The low-pressure assembly (11) includes a low-pressure cylinder (111) and a low-pressure cylinder cover (112). The low-pressure cylinder (111) is penetrated from top to bottom. The low-pressure cylinder cover (112) is provided at the bottom of the low-pressure cylinder (111). A low-pressure gas inlet and outlet (113) communicating with the low-pressure cavity (134) is provided on the low-pressure cylinder cover (112). The high-pressure assembly (12) includes a boosting cylinder (121) and a boosting cylinder cover (122), the boosting cylinder (121) penetrates from top to bottom, the boosting cylinder cover (122) is provided on the top of the boosting cylinder (121), and a high-pressure gas inlet and outlet (123) communicating with the high-pressure cavity (136) is provided on the boosting cylinder cover (122); The low-pressure cylinder (111) and the boost cylinder (121) are an integrated structure, and are provided with a buffer medium inlet and outlet (137) communicating with the buffer cavity (135).

3. The gas pressurization test system according to claim 2, characterized in that: The gas boosting device (1) further includes a detection component (15) communicatively connected to the electrical control and storage subsystem (7), the detection component (15) including a pressure sensor (151), a displacement sensor (152), and a strain gauge; The pressure sensor (151) is mounted on the low-pressure cylinder head (112) and the boost cylinder head (122) and inserted into the piston cavity; the displacement sensor (152) is mounted on the low-pressure cylinder head (112) and vertically inserted upward into the low-pressure cylinder piston (131) and the piston connecting rod (133); and the strain gauge is arranged on the low-pressure cylinder (111) and the boost cylinder (121).

4. The gas pressurization test system according to claim 1, wherein: The gas boosting device (1) and the buffer medium source (3) are both mounted on the skid seat (2). The buffer medium source (3) contains a buffer medium and is connected to the buffer cavity (135) of the gas boosting device (1) through a buffer medium inlet and outlet pipe (31), thereby delivering the buffer medium to the buffer cavity (135) to buffer the movement of the piston assembly (13). The height of the buffer medium source (3) is higher than the height of the buffer cavity (135).

5. The gas pressurization test system according to claim 4, characterized in that: The skid seat (2) is provided with a first skid frame (21) and a second skid frame (22); the gas boosting device (1) and the buffer medium source (3) are respectively installed on the first skid frame (21) and the second skid frame (22), and the two are arranged side by side; the buffer medium inlet and outlet pipe (31) is provided with a valve (32), a pressure transmitter (33) and a throttle plate (34); a boost gas leakage probe alarm (4) is provided next to the gas boosting device (1); The buffer medium inlet and outlet pipe (31) comprises an inlet and outlet main pipe (311), an annular pipe (312) and a plurality of branch pipes (313); one end of the inlet and outlet main pipe (311) is connected to the buffer medium source (3), and the other end is connected to the annular pipe (312); the annular pipe (312) is arranged in an annular manner on the outer wall of the buffer cavity (135) of the gas boosting device (1), and is connected to the buffer cavity (135) through the plurality of branch pipes (313).

6. The gas pressurization test system according to claim 1, wherein: The first pipeline is provided with a first exhaust port and a vacuum pumping device, and the second pipeline is provided with a second exhaust port.

7. A gas pressurization test method, characterized in that: The following steps are involved: S1. Clean and degrease all pipelines, equipment and containers of the gas pressurization test system according to any one of claims 1 to 6; S2. Fill the high-pressure chamber and low-pressure chamber of the gas pressurization test system with nitrogen to check their air tightness, and perform a pressurization pre-test using nitrogen; S3. Conduct a gas pressurization test using compressed gas; S4. During the test, the low-pressure gas source provides nitrogen low-pressure gas to the low-pressure cavity, the compressed gas source provides the gas that needs to be pressurized to the high-pressure cavity, and the buffer medium source provides the buffer medium to the buffer cavity. The nitrogen low-pressure gas in the low-pressure cavity drives the piston assembly to move and compresses the gas that needs to be pressurized in the high-pressure cavity. The electrical control and storage subsystem monitors the operating data of the gas boosting device and each pipeline and processes and displays the monitored data.

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