A selector for pressure chamber sampling channels and a method of sampling channels

Abstract

A selector and sampling method for sampling channels in a pressure chamber are disclosed. The chamber includes a sampling channel selector internally connected to high-pressure media at different locations via sampling branch pipes. One end of the selector is connected to an external sampling shut-off valve via a sampling pipeline. The output of the shut-off valve is connected in series with a pressure regulating valve, a flow meter, and a sampling tank. The other end is connected to an external drive shut-off valve via a drive pipeline. The input of the drive shut-off valve is connected in series with a sampling pressure regulating valve and a seawater tank. A high-pressure pump, a check valve, and a pressure-maintaining regulating valve are connected in series at both ends of the seawater tank via pipelines. Through a uniquely designed static and rotor structure, the sampling channel selection is achieved solely by the pressure inside the pressure chamber, driving the separation, rotation, and docking of the connecting pipe. This allows for sampling at various measurement points in the high-pressure environment of the deep sea, effectively reducing the number of penetration interfaces and lowering the design requirements for penetration structures. It also simplifies external piping and facilitates integrated automatic operation.

Description

Technical Field

[0001] This invention relates to the field of deep-sea simulation chamber sampling equipment technology, and in particular to a selector and channel selection sampling method for pressure chamber sampling channels. Background Technology

[0002] The pressure chamber sampling channel selector is used for the collection of samples from the onshore cold seep simulation chamber. Multiple monitoring points are usually set up inside the cold seep simulation chamber. By sampling, detecting, and analyzing the gas-containing liquid at each monitoring point, the injection of multi-component gas is controlled to establish and maintain realistic physicochemical environmental conditions in the cold seep area.

[0003] Currently, each sampling channel at each monitoring point in the existing technology requires penetration through the chamber, necessitating the centralized configuration of multiple penetration interfaces within the pressure chamber. This results in a large number of external pipelines and control valves, making operation cumbersome. Furthermore, especially when the cold spring chamber is in a high-pressure environment, it places higher demands on the structural design of the connections, and the numerous penetration interfaces also increase the risk of leakage. Summary of the Invention

[0004] In response to the shortcomings of the existing production technology, the applicant provides a selector and a sampling method for the sampling channel of the pressure chamber, which can effectively reduce the number of trans-chamber interfaces and lower the structural design requirements of the trans-chamber, simplify the external piping, and make the operation more convenient.

[0005] The technical solution adopted in this invention is as follows:

[0006] A selector for a sampling channel in a pressure chamber includes a pressure chamber. The sampling channel selector is installed inside the pressure chamber and is connected to high-pressure media at different locations via sampling branch pipes. One end of the sampling channel selector is connected to a sampling shut-off valve outside the chamber via a sampling pipe. The output of the sampling shut-off valve is connected in series with a pressure regulating valve, a flow meter, and a sampling box. The other end of the sampling channel selector is connected to a drive shut-off valve outside the chamber via a drive pipe. The input of the drive shut-off valve is connected in series with a sampling pressure regulating valve and a seawater tank. A high-pressure pump, a check valve, and a pressure-holding regulating valve are connected in series at both ends of the seawater tank via pipelines. The output of the pressure-holding regulating valve is connected to the pressure chamber via a branch pipe, on which a pressure-holding shut-off valve is installed.

[0007] Its further technical solution lies in:

[0008] A top pressure gauge is installed on the top surface of the pressure chamber.

[0009] The pressure in the pressure chamber is controlled by a pressure-maintaining and regulating valve in a closed loop based on the target pressure value of the pressure chamber and the pressure gauge at the top.

[0010] The sampling channel selector has the following structure: it includes a rotor with a hollow interior. At one end of the rotor, a first and a second flow channel are spaced axially at intervals, and a third and a turbine-type flow channel are spaced radially at intervals. At the other end of the rotor, a guide groove is provided on the outer wall of the bottom, and a connecting pipe is provided with a radial opening at the bottom. A stationary body is installed inside the rotor, and a buoyancy block is installed on the outer wall of the middle section of the rotor. The middle section of the stationary body is solid, and both ends are hollow. At one end of the stationary body, a drive cavity is located inside, and a detachable first baffle is located outside. At the other end of the stationary body, a sampling cavity is located inside, and a second baffle, a branch interface, and a sampling interface are located outside. The outer end of the branch interface is a branch interface. Ball bearings are provided on the opposing surfaces of the first and second baffles. A guide post is fixedly installed on the second baffle, and the guide post moves along the rotor guide groove.

[0011] The drive interface is installed on the outside of the first baffle via a clamping nut.

[0012] The rotor and the stationary body are both integral structures.

[0013] The rotor and the stationary body are installed concentrically.

[0014] The relative motion trajectory between the rotor and the stationary body is determined by the guide groove through the guide column.

[0015] It also includes sealing rings, specifically: No. 1 and No. 2 sealing rings between the sampling chamber and the rotor; No. 3 and No. 4 sealing rings between the drive chamber and the rotor; and No. 5 sealing ring between the docking pipe and the branch interface.

[0016] A channel selection sampling method for a pressure chamber sampling channel selector includes the following operation procedure:

[0017] S1. Separation of the connector:

[0018] When the rotor moves to the second baffle, the first flow channel and the drive cavity are connected. The pressure of the control drive pressure regulating valve is lower than the pressure of the pressure chamber. The drive shut-off valve is opened. The high-pressure medium in the pressure chamber flows into the drive cavity and drive pipe along the first flow channel and generates a reaction force. At this time, the rotor is driven to move along the static body axis with the cooperation of the guide column and guide groove, so that the docking pipe and branch interface are gradually separated.

[0019] S2, Rotation of the connecting pipe:

[0020] When the rotor is close to the first baffle, the third flow channel and the drive chamber are connected. The high-pressure medium in the pressure chamber flows into the drive chamber along the second flow channel and the turbine flow channel in sequence and generates a reaction force. At this time, with the cooperation of the guide column and the guide groove, the rotor is driven to move along the axial direction of the stationary body to the first baffle, and then rotates around the stationary body until the docking pipe and the next branch interface are concentric, and then the drive shut-off valve is closed.

[0021] S3. Handover and takeover procedures:

[0022] Control the pressure of the sampling pressure regulating valve to be lower than the pressure of the pressure chamber, open the sampling stop valve, and the high pressure medium in the pressure chamber flows into the docking pipe to generate a reaction force, so that one end of the docking pipe with the sealing ring is gradually inserted into the branch interface. When the rotor moves to the second baffle, the docking pipe and the next adjacent branch interface are docked.

[0023] S4. Sampling at measuring points:

[0024] The high-pressure medium in the pressure chamber flows sequentially into the branch interface, sampling chamber and sampling pipeline along the sampling branch pipe. When the flow meter reports that the sample quantity meets the requirements, the sampling stop valve is closed to stop sampling.

[0025] S5. Repeat S1 to S4 to make the rotor rotate around the stationary body so that the docking pipes are connected to the sampling interface one by one, and complete the selection and sampling of each branch pipe respectively.

[0026] The beneficial effects of this invention are as follows:

[0027] This invention features a compact and rational structure and is easy to operate. Through the coordinated operation of uniquely designed components such as the static body, rotor, pressure chamber, drive, sampling, and pressure-holding pipes, the sampling channel selector relies entirely on the internal pressure of the pressure chamber to select the sampling channel. This allows for sampling at various measurement points to be completed in the high-pressure environment of the deep sea, effectively reducing the number of penetration interfaces and lowering the structural design requirements of penetrations. It also simplifies external piping and makes overall integrated automatic operation easier.

[0028] In addition, the sampling channel selector in this invention has a basically balanced internal and external pressure, can withstand high pressure, and the number of sampling interfaces can be flexibly modified according to the number of measuring points to adapt to the sampling requirements of different pressure chambers. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the present invention.

[0030] Figure 2 This is a cross-sectional view of the sampling channel distributor of the present invention.

[0031] Figure 3 This is a cross-sectional view of the stationary body of the sampling channel distributor of the present invention.

[0032] Figure 4 This is a cross-sectional view of the rotor of the sampling channel distributor of the present invention.

[0033] Figure 5 This is a schematic diagram of the guide column trajectory of the present invention.

[0034] Figure 6This is a schematic diagram of the structure of the present invention, which separates the sampling interface and the connecting pipe.

[0035] The components include: 1. Seawater tank; 2. High-pressure pump; 3. Check valve; 4. Pressure holding and regulating valve; 5. Pressure holding and shut-off valve; 6. Drive pressure regulating valve; 7. Drive shut-off valve; 8. Sampling box; 9. Flow meter; 10. Sampling pressure regulating valve; 11. Sampling channel selector; 12. Pressure chamber; 13. Pressure gauge; 14. Sampling shut-off valve; 15. Sampling branch pipe; 16. Sampling pipeline; 17. Drive pipeline.

[0036] 1101. Drive interface; 1102. Clamping nut; 1103. Baffle No. 1; 1104. Flow channel No. 1; 1105. Flow channel No. 2; 1106. Turbine flow channel; 1107. Flow channel No. 3; 1108. Drive cavity; 1109. Buoyancy block; 1110. Guide post; 1111. Guide groove; 1112. Sampling interface; 1113. Ball bearing; 1114. Rotor; 1115. Sealing ring; 1116. Connecting pipe; 1117. Baffle No. 2; 1118. Sampling cavity; 1119. Branch interface; 1120. Static body; 1121. Branch interface;

[0037] 11151, No. 1 sealing ring; 11152, No. 2 sealing ring; 11153, No. 3 sealing ring; 11154, No. 4 sealing ring; 11155, No. 5 sealing ring. Detailed Implementation

[0038] The specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0039] like Figures 1-6 As shown, the selector for the sampling channel of the pressure chamber in this embodiment includes a pressure chamber 12. A sampling channel selector 11 is installed inside the pressure chamber 12. The sampling channel selector 11 is connected to the high-pressure medium in different parts through a sampling branch pipe 15. One end of the sampling channel selector 11 is connected to the sampling stop valve 14 outside the chamber through a sampling pipe 16. The output end of the sampling stop valve 14 is connected in series with a driving pressure regulating valve 10, a flow meter 9, and a sampling box 8. The other end of the sampling channel selector 11 is connected to the driving stop valve 7 outside the chamber through a driving pipe 17. The input end of the driving stop valve 7 is connected in series with a sampling pressure regulating valve 6 and a seawater tank 1. The two ends of the seawater tank 1 are connected in series with a high-pressure pump 2, a one-way valve 3, and a pressure holding regulating valve 4 through pipelines. The output end of the pressure holding regulating valve 4 is connected to the pressure chamber 12 through a branch pipe. A pressure holding stop valve 5 is installed on the branch pipe.

[0040] A top pressure gauge 13 is installed on the top surface of the pressure chamber 12.

[0041] The pressure in pressure chamber 12 is controlled by pressure-maintaining and regulating valve 4 in a closed loop based on the target value of pressure chamber 12 and top pressure gauge 13.

[0042] The sampling channel selector 11 has the following structure: it includes a rotor 1114, which has a hollow interior. At one end of the rotor 1114, at axial intervals, are two flow channels 1104 and 1105; at radial intervals, at 3rd flow channel 1107 and turbine flow channel 1106. At the other end of the rotor 1114, at the bottom outer wall, is a guide groove 1111, and at the bottom, at a radial opening, is a connecting pipe 1116. A stationary body 1120 is fitted inside the rotor 1114. A buoyancy block 1109 is installed on the outer wall of the middle section of the rotor 1114. The middle section of the stationary body 1120 has a solid structure. The two ends of 1120 are hollow. One end of the stationary body 1120 has a drive cavity 1108 inside and a detachable first baffle 1103 outside. The other end of the stationary body 1120 has a sampling cavity 1118 inside and a second baffle 1117, a branch interface 1119 and a sampling interface 1112 outside. The outer end of the branch interface 1119 is a branch interface 1121. Ball bearings 1113 are provided on the opposite surfaces of the first baffle 1103 and the second baffle 1117. A guide post 1110 is fixedly installed on the second baffle 1117. The guide post 1110 moves along the guide groove 1111 of the rotor 1114.

[0043] A drive interface 1101 is installed on the outside of the first baffle 1103 via a clamping nut 1102.

[0044] Both the rotor 1114 and the stationary body 1120 are integral structures.

[0045] The rotor 1114 and the stationary body 1120 are installed concentrically.

[0046] The relative motion trajectory of the rotor 1114 and the stationary body 1120 is determined by the guide groove 1111 through the guide post 1110.

[0047] It also includes sealing rings 1115, specifically: sealing ring 11151 and sealing ring 11152 between sampling chamber 1118 and rotor 1114; sealing ring 3 11153 and sealing ring 4 11154 between drive chamber 1108 and rotor 1114; and sealing ring 5 11155 between docking pipe 1116 and branch interface 1121.

[0048] The specific structure and function of the selector for the pressure chamber sampling channel described in this invention are as follows:

[0049] It mainly includes a pressure chamber 12, which is equipped with a sampling branch pipe 15 to connect the high-pressure medium in different parts to the sampling channel selector 11. The sampling channel selector 11 is connected to the sampling stop valve 14 outside the chamber through the sampling pipe 16. The output end of the sampling stop valve 14 is connected in series with the driving pressure regulating valve 10, the flow meter 9 and the sampling box 8.

[0050] The sampling channel selector 11 is connected to the drive shut-off valve 7 outside the cabin via the drive pipe 17. The input end of the drive shut-off valve 7 is connected in series with the sampling pressure regulating valve 6 and the seawater tank 1.

[0051] It also includes a high-pressure pump 2, which pressurizes the low-pressure medium in the seawater tank 1 and then delivers it to the pressure chamber 12 via a one-way valve 3, a pressure-holding and regulating valve 4, and a pressure-holding and shut-off valve 5. The pressure in the pressure chamber 12 is controlled by the pressure-holding and regulating valve 4 in a closed loop according to the target value of the pressure chamber 12 and the top pressure gauge 13.

[0052] The sampling channel selector 11 has the following structure: it includes a rotor 1114, which has a hollow interior. Multiple flow channels 1104 and 1105 are spaced axially at one end of the rotor 1114, and multiple flow channels 1107 and turbine-type flow channels 1106 are spaced radially at one end. A guide groove 1111 is provided on the outer wall of the bottom of the other end of the rotor 1114, and a connecting pipe 1116 is provided with a radial opening at the bottom. A stationary body 1120 is installed inside the rotor 1114, and a buoyancy block 1109 is installed on the outer wall of the middle part of the rotor 1114. The middle part of 1120 is solid, and the two ends of the stationary body 1120 are hollow. One end has a drive cavity 1108 inside and a detachable first baffle 1103 outside. The other end has a sampling cavity 1118 inside and a non-detachable second baffle 1117 and a sampling interface 1112 and branch interface 1121 integrated block outside. Ball bearings 1113 are provided on the opposite surfaces of the first baffle 1103 and the second baffle 1117. The second baffle 1117 is fixedly installed with a guide post 1110, which moves along the guide groove 1111 of the rotor 1114.

[0053] The rotor 1114 has an integral structure.

[0054] The static 1120 has a one-piece structure.

[0055] The rotor 1114 and the stationary body 1120 are installed concentrically.

[0056] The relative motion trajectory of the rotor 1114 and the stationary body 1120 is determined by the guide groove 1111 through the guide post 1110.

[0057] The sampling chamber 1118 is sealed to the rotor 1114 by sealing ring 11151 and sealing ring 11152; the drive chamber 1108 is sealed to the rotor 1114 by sealing ring 31153 and sealing ring 41154; and the docking pipe 1116 is sealed to the branch interface 1121 by sealing ring 51155.

[0058] In actual work, the process of selecting the channel sampling method is as follows:

[0059] S1, Separation of the connecting pipe:

[0060] When the rotor 1114 moves to the second baffle 1117, the first flow channel 1104 and the drive chamber 1108 are connected. The pressure of the drive pressure regulating valve 6 is controlled to be slightly less than the pressure of the pressure chamber 12. The drive shut-off valve 7 is opened. The high-pressure medium of the pressure chamber 12 flows into the drive chamber 1108 and the drive pipe 17 along the first flow channel 1104 and generates a reaction force. At this time, with the cooperation of the guide column 1110 and the guide groove 1111, the rotor 1114 is driven to move axially along the stationary body 1120, so that the docking pipe 1116 and the branch interface 1121 are gradually separated.

[0061] S2, Rotation of the connecting pipe:

[0062] When the rotor 1114 is close to the first baffle 1103, the third flow channel 1107 and the drive chamber 1108 are connected. The high pressure medium of the pressure chamber 12 flows into the drive chamber 1108 along the second flow channel 1105 and the turbine flow channel 1106 and generates a reaction force. At this time, with the cooperation of the guide column 1110 and the guide groove 1111, the rotor 1114 is driven to move axially along the stationary body 1120 to the first baffle 1103, and then rotates around the stationary body 1120 until the docking pipe 1116 and the next branch interface 1121 are concentric, and then the drive shut-off valve 7 is closed.

[0063] S3. Handover and docking:

[0064] The pressure of the sampling pressure regulating valve 10 is controlled to be slightly lower than the pressure of the pressure chamber 12. The sampling stop valve 14 is opened, and the high-pressure medium in the pressure chamber 12 flows into the docking pipe 1116, generating a reaction force. This causes one end of the docking pipe 1116 with the No. 5 sealing ring 11155 to gradually insert into the branch interface 1121. When the rotor 1114 moves to the No. 2 baffle 1117, the docking pipe 1116 and the next adjacent branch interface 1121 are docked.

[0065] S4. Sampling at measuring points:

[0066] The high-pressure medium in the pressure chamber 12 flows sequentially into the branch interface 1119, the sampling chamber 1118 and the sampling pipe 16 along the sampling branch pipe 15. When the flow meter 9 reports that the sample quantity meets the requirements, the sampling stop valve 14 is closed to stop sampling.

[0067] S5. Repeat S1 to S4 to make the rotor 1114 rotate circumferentially along the stationary body 1120 so that the docking pipes 1116 are docked with the sampling interfaces 1112 one by one, and the selection and sampling of each branch pipe are completed respectively.

[0068] This embodiment includes components such as a sampling channel selector 11, a pressure chamber 12, a drive pressure regulating valve 6, a sampling pressure regulating valve 10, a pressure holding regulating valve 4, and pipelines. The pressure chamber 12 has a pressure of 20 MPa and a main body height of 15 meters. Ten sampling branch pipes 15 are arranged equidistantly along the axial direction inside. The sampling channel selector 11, driven by the drive stop valve 7 and the sampling stop valve 14, relies on the internal pressure of the pressure chamber 12 to drive the separation, rotation, and docking of the connecting pipes 1116, completing the sampling channel selection. This connects the 20 MPa high-pressure medium from different locations to the sampling channel selector 11 for sampling. During sampling in the pressure chamber 12, the high-pressure pump 2 pressurizes the low-pressure medium from the seawater tank 1 and then delivers it to the pressure chamber 12 via a one-way valve 3, a pressure holding regulating valve 4, and a pressure holding stop valve 5, compensating for pressure fluctuations caused by sampling in real time. Compared to the original sampling method, the number of penetration interfaces is reduced from ten to two, and the number of operating valves is reduced from ten to two, simplifying the external piping and making overall integrated automatic operation easier.

[0069] The above description is an explanation of the present invention and not a limitation thereof. The scope of the present invention is defined by the claims. Within the scope of protection of the present invention, any form of modification may be made.

Claims

1. A selector for a pressure chamber sampling channel, characterized in that: The system includes a pressure chamber (12), inside which a sampling channel selector (11) is installed. The sampling channel selector (11) is connected to high-pressure media in different locations through a sampling branch pipe (15). One end of the sampling channel selector (11) is connected to a sampling shut-off valve (14) outside the chamber through a sampling pipe (16). The output end of the sampling shut-off valve (14) is connected in series with a driving pressure regulating valve (10), a flow meter (9), and a sampling box (8). The other end of the sampling channel selector (11) is connected to a driving shut-off valve (7) outside the chamber through a driving pipe (17). The input end of the driving shut-off valve (7) is connected in series with a sampling pressure regulating valve (6) and a seawater tank (1). The two ends of the seawater tank (1) are connected in series with a high-pressure pump (2), a check valve (3), and a pressure-holding regulating valve (4) through pipelines. The output end of the pressure-holding regulating valve (4) is connected to the pressure chamber (12) through a branch pipe. A pressure-holding shut-off valve (5) is installed on the branch pipe. The sampling channel selector (11) has the following structure: it includes a rotor (1114), which has a hollow interior. At one end of the rotor (1114), a first flow channel (1104) and a second flow channel (1105) are spaced axially at the bottom, and a third flow channel (1107) and a turbine-type flow channel (1106) are spaced radially at the bottom. At the other end of the rotor (1114), a guide groove (1111) is provided on the outer wall of the bottom, and a connecting pipe (1116) is provided with a radial opening at the bottom. A stationary body (1120) is installed inside the rotor (1114), and a buoyancy block (1109) is installed on the outer wall of the middle part of the rotor (1114). The middle part of the stationary body (1120) has a solid structure. The two ends of the static body (1120) are hollow. One end of the static body (1120) is provided with a drive cavity (1108) inside and a detachable first baffle (1103) outside. The other end of the static body (1120) is provided with a sampling cavity (1118) inside and a second baffle (1117), a branch interface (1119) and a sampling interface (1112) outside. The branch interface (1119) has a branch interface (1121) at its outer end. The first baffle (1103) and the second baffle (1117) are provided with ball bearings (1113) on their opposite surfaces. The second baffle (1117) is fixedly installed with a guide post (1110). The guide post (1110) moves along the guide groove (1111) of the rotor (1114).

2. A selector for a pressure chamber sampling channel as described in claim 1, characterized in that: A top pressure gauge (13) is installed on the top surface of the pressure chamber (12).

3. A selector for a pressure chamber sampling channel as described in claim 2, characterized in that: The pressure in the pressure chamber (12) is controlled by the pressure regulating valve (4) in a closed loop according to the target value of the pressure chamber (12) and the top pressure gauge (13).

4. A selector for a pressure chamber sampling channel as described in claim 1, characterized in that: A drive interface (1101) is installed outside the first baffle (1103) via a clamping nut (1102).

5. A selector for a pressure chamber sampling channel as described in claim 1, characterized in that: The rotor (1114) and the stationary body (1120) are both integral structures.

6. A selector for a pressure chamber sampling channel as described in claim 1, characterized in that: The rotor (1114) and the stationary body (1120) are installed concentrically.

7. A selector for a pressure chamber sampling channel as described in claim 1, characterized in that: The relative motion trajectory of the rotor (1114) and the stationary body (1120) is determined by the guide groove (1111) through the guide post (1110).

8. A selector for a pressure chamber sampling channel as described in claim 1, characterized in that: It also includes sealing rings (1115), specifically: sealing ring No. 1 (11151) and sealing ring No. 2 (11152) between the sampling chamber (1118) and the rotor (1114); sealing ring No. 3 (11153) and sealing ring No. 4 (11154) between the drive chamber (1108) and the rotor (1114); and sealing ring No. 5 (11155) between the docking pipe (1116) and the branch interface (1121).

9. A channel selection sampling method using the selector for pressure chamber sampling channels as described in claim 1, characterized in that: The following operational procedures are included: S1. Separation of the connector: When the rotor (1114) moves to the second baffle (1117), the first flow channel (1104) and the drive cavity (1108) are connected. The pressure of the control drive pressure regulating valve (6) is less than the pressure of the pressure chamber (12), and the drive shut-off valve (7) is opened. The high pressure medium of the pressure chamber (12) flows into the drive cavity (1108) and the drive pipe (17) in sequence along the first flow channel (1104) and generates a reaction force. At this time, the rotor (1114) is driven to move along the axial direction of the stationary body (1120) under the cooperation of the guide column (1110) and the guide groove (1111), so that the docking pipe (1116) and the branch interface (1121) are gradually separated. S2, Rotation of the connecting pipe: When the rotor (1114) is close to the first baffle (1103), the third flow channel (1107) and the drive cavity (1108) are connected. The high pressure medium in the pressure chamber (12) flows into the drive cavity (1108) along the second flow channel (1105) and the turbine flow channel (1106) and generates a reaction force. At this time, with the cooperation of the guide column (1110) and the guide groove (1111), the rotor (1114) first moves along the axial direction of the stationary body (1120) to the first baffle (1103), and then rotates around the stationary body (1120) until the docking pipe (1116) and the next branch interface are concentric, and then the drive shut-off valve (7) is closed. S3. Handover and takeover procedures: Control the pressure of the sampling pressure regulating valve (10) to be less than the pressure of the pressure chamber (12), open the sampling stop valve (14), and the high pressure medium in the pressure chamber (12) flows into the docking pipe (1116) to generate a reaction force, so that one end of the docking pipe (1116) with the sealing ring (1115) is gradually inserted into the branch interface. When the rotor (1114) moves to the second baffle (1117), the docking pipe (1116) and the next adjacent branch interface are docked. S4. Sampling at measuring points: The high-pressure medium in the pressure chamber (12) flows into the branch interface (1119), sampling chamber (1118) and sampling pipeline (16) in sequence along the sampling branch pipe (15). When the flow meter (9) reports that the sample quantity meets the requirements, the sampling stop valve (14) is closed to stop sampling. S5. Repeat S1 to S4 to make the rotor (1114) rotate circumferentially along the stationary body (1120) so that the docking pipe (1116) docks with the sampling interface one by one, and completes the selection and sampling of each branch pipe respectively.

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