Selector for pressure chamber sampling channel and channel selection sampling method

Abstract

The selector comprises a pressure chamber, a sampling channel selector is arranged in the pressure chamber, the sampling channel selector is communicated with high-pressure media at different parts through sampling branch pipes, one end of the sampling channel selector is connected with a sampling stop valve outside the chamber through a sampling pipeline, and the other end of the sampling channel selector is connected with a sampling valve. The output end of the sampling stop valve is sequentially connected in series with a driving pressure regulating valve, a flowmeter and a sampling box; the input end of the driving stop valve is sequentially connected with a sampling pressure regulating valve and a seawater tank in series, and the two ends of the seawater tank are sequentially connected with a high-pressure pump, a one-way valve and a pressure maintaining and regulating valve in series through pipelines. Through the uniquely-designed static body and rotor structure, the butt joint pipes are driven to be separated, rotated and butted only by the internal pressure of the pressure chamber to complete sampling channel selection, sampling work of each measuring point is completed in a deep sea high-pressure environment, the number of arranged chamber penetrating connectors is effectively reduced, the chamber penetrating structure design requirement is lowered, pipelines outside the chamber are simplified, and the working efficiency is improved. And integral integration and automatic operation are easier.

Description

Technical Field

[0001] The present invention relates to the technical field of deep - sea simulation chamber sampling equipment, and in particular to a selector for a sampling channel of a pressure chamber and a sampling method for selecting a channel. Background Art

[0002] The pressure chamber sampling channel selector is used for collecting samples of on - shore cold - seep simulation chambers. Multiple monitoring points are usually arranged inside the cold - seep simulation chamber. By sampling, detecting, and analyzing the gas - containing liquid at each monitoring point, the injection of multi - component gases is controlled to establish and maintain a realistic physical and chemical environmental condition in the cold - seep area.

[0003] Currently, each sampling channel of the existing technology needs to penetrate the chamber. Multiple penetration interfaces need to be centrally configured in the pressure chamber, resulting in more external - chamber pipelines and control valves, and the operation is rather cumbersome. In addition, especially when the cold - seep chamber is in a high - pressure environment, higher requirements are imposed on the structural design of the connection points, and more penetration interfaces also increase the risk of leakage. Summary of the Invention

[0004] The applicant of the present invention aims at the above - mentioned disadvantages in the existing production technology, and provides a selector for a sampling channel of a pressure chamber and a sampling method for selecting a channel, which can effectively reduce the number of penetration interface settings and lower the requirements for the penetration structure design, simplify the external - chamber pipelines, and make the operation more convenient.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A selector for a sampling channel of a pressure chamber includes a pressure chamber. A sampling channel selector is installed inside the pressure chamber. The sampling channel selector is communicated with high - pressure media at different parts through sampling branch pipes. One end of the sampling channel selector is connected to a sampling stop valve outside the chamber through a sampling pipeline. The output end of the sampling stop valve is successively connected in series with a driving pressure regulating valve, a flowmeter, and a sampling tank. The other end of the sampling channel selector is connected to a driving stop valve outside the chamber through a driving pipeline. The input end of the driving stop valve is successively connected in series with a sampling pressure regulating valve and a seawater tank. Both ends of the seawater tank are successively connected in series with a high - pressure pump, a check valve, and a pressure - maintaining pressure regulating valve through pipelines. The output end of the pressure - maintaining pressure regulating valve is connected to the pressure chamber through a branch pipe, and a pressure - maintaining stop valve is installed on the branch pipe.

[0007] As a selector for a sampling channel of a pressure chamber according to claim 1, a top pressure gauge is installed on the top surface of the pressure chamber.

[0008] As a selector for a sampling channel of a pressure chamber according to claim 2, the pressure of the pressure chamber is closed - loop regulated and controlled by the pressure - maintaining pressure regulating valve according to the pressure chamber target value and the top pressure gauge.

[0009] A selector for a sampling channel of a pressure chamber, the structure of the sampling channel selector being: including a rotor, the inside of the rotor being hollow, at the bottom of one end of the rotor, a first flow channel and a second flow channel are distributed at intervals along the axial direction, a third flow channel and a turbine flow channel are distributed at intervals along the radial direction, on the outer wall of the bottom of the other end of the rotor, a guiding groove is provided, and a butting pipe is provided with an opening along the radial direction at the bottom, a stator is fitted inside the rotor, and a buoyancy block is installed on the outer wall of the middle of the rotor; the middle of the stator is a solid structure, the two ends of the stator are hollow structures, a driving cavity is provided inside one end of the stator, a detachable first baffle is provided outside, a sampling cavity is provided inside the other end of the stator, a second baffle, a branch connection port and a sampling port are respectively provided outside, the outer end of the branch connection port is a branch interface, balls are provided on the opposite surfaces of the first baffle and the second baffle, a guiding column is fixedly installed on the second baffle, and the guiding column moves along the guiding groove of the rotor.

[0010] Its further technical solution lies in:

[0011] A driving interface is installed outside the first baffle through a compression nut.

[0012] Both the rotor and the stator are of an integral structure.

[0013] The rotor and the stator are concentrically installed.

[0014] The relative movement trajectory of the rotor and the stator is determined by the guiding column from the guiding groove.

[0015] It further includes sealing rings, specifically: a first sealing ring and a second sealing ring are used for sealing between the sampling cavity and the rotor; a third sealing ring and a fourth sealing ring are used for sealing between the driving cavity and the rotor; a fifth sealing ring is used for sealing between the butting pipe and the branch interface.

[0016] A channel selection and sampling method for a selector of a sampling channel of a pressure chamber, including the following operation process:

[0017] S1. Separation work of the butting pipe:

[0018] When the rotor moves to the second baffle, the first flow channel is communicated with the driving cavity, control the pressure of the driving pressure regulating valve to be less than the pressure of the pressure chamber, open the driving stop valve, the high-pressure medium in the pressure chamber flows into the driving cavity and the driving pipe in sequence along the first flow channel and generates a reaction force, at this time, under the cooperation of the guiding column and the guiding groove, the rotor is driven to move axially along the stator, so that the butting pipe and the branch interface are gradually separated;

[0019] S2. Rotation work of the butting pipe:

[0020] When the rotor is approaching the first baffle plate, the third flow channel communicates with the driving cavity. The high-pressure medium in the pressure chamber flows into the driving cavity successively along the second flow channel and the turbine flow channel and generates a reaction force. At this time, under the cooperation of the guiding column and the guiding groove, the rotor is driven to first move axially along the static body to the first baffle plate, and then rotate circumferentially around the static body until the docking pipe and the next branch interface are concentric, and then the driving stop valve is closed;

[0021] S3. Docking work of the docking pipe:

[0022] Control the pressure of the sampling pressure regulating valve to be less than the pressure in 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 a sealing ring gradually inserts into the branch interface. When the rotor moves to the second baffle plate, the docking pipe and the next adjacent branch interface complete the docking;

[0023] S4. Measuring point sampling:

[0024] The high-pressure medium in the pressure chamber flows into the branch docking interface, the sampling cavity and the sampling pipe successively along the sampling branch pipe. When the flowmeter feedbacks that the sample quantity meets the requirements, close the sampling stop valve to stop sampling;

[0025] Repeat S1 - S4, make the rotor rotate circumferentially along the static body to let the docking pipe dock with the sampling interfaces one by one, and complete the selection and sampling of each branch connecting pipe respectively.

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

[0027] The structure of the present invention is compact and reasonable, and the operation is convenient. Through the mutual cooperation of the uniquely designed static body, rotor, pressure chamber, driving, sampling, pressure maintaining pipe fittings and other components, the sampling channel selector completely relies on the internal pressure of the pressure chamber to drive for sampling channel selection, and completes the sampling work of each measuring point in the deep-sea high-pressure environment, effectively reducing the number of through-hull interfaces and the design requirements of the through-hull structure, simplifying the external pipeline of the cabin, and making the overall integrated automatic operation easier.

[0028] In addition, the internal and external pressures of the sampling channel selector in the present invention are basically balanced, it can withstand high pressure, and the number of sampling docking interfaces can be flexibly modified according to the number of measuring points to meet the sampling requirements of different pressure chambers. Description of the drawings

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

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

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

[0032] Figure 4 Cross-sectional view of the rotor of the sampling channel distributor of the present invention.

[0033] Figure 5 Schematic diagram of the guiding column trajectory of the present invention.

[0034] Figure 6 Schematic diagram of the structure of the sampling docking interface and the docking pipe separated from each other according to the present invention.

[0035] Wherein: 1. Seawater tank; 2. High-pressure pump; 3. Check valve; 4. Pressure maintaining and regulating valve; 5. Pressure maintaining stop valve; 6. Driving regulating valve; 7. Driving stop valve; 8. Sampling tank; 9. Flowmeter; 10. Sampling regulating valve; 11. Sampling channel selector; 12. Pressure chamber; 13. Pressure gauge; 14. Sampling stop valve; 15. Sampling branch pipe; 16. Sampling pipeline; 17. Driving pipeline;

[0036] 1101. Driving interface; 1102. Compression nut; 1103. First baffle; 1104. First flow channel; 1105. Second flow channel; 1106. Turbine flow channel; 1107. Third flow channel; 1108. Driving cavity; 1109. Buoyancy block; 1110. Guiding column; 1111. Guiding groove; 1112. Sampling interface; 1113. Ball; 1114. Rotor; 1115. Sealing ring; 1116. Docking pipeline; 1117. Second baffle; 1118. Sampling cavity; 1119. Branch docking interface; 1120. Static body; 1121. Branch interface;

[0037] 11151. First sealing ring; 11152. Second sealing ring; 11153. Third sealing ring; 11154. Fourth sealing ring; 11155. Fifth sealing ring. Specific embodiments

[0038] The following will describe the specific embodiments of the present invention with reference to the accompanying drawings.

[0039] As Figures 1-6 shown, the selector for the sampling channel of the pressure chamber of this embodiment includes a pressure chamber 12, and a sampling channel selector 11 is installed inside the pressure chamber 12. The sampling channel selector 11 is communicated with high-pressure media at different positions through a sampling branch pipe 15. One end of the sampling channel selector 11 is connected to a sampling stop valve 14 outside the chamber through a sampling pipeline 16. The output end of the sampling stop valve 14 is successively connected in series with a driving regulating valve 10, a flowmeter 9, and a sampling tank 8; the other end of the sampling channel selector 11 is connected to a driving stop valve 7 outside the chamber through a driving pipeline 17. The input end of the driving stop valve 7 is successively connected in series with a sampling regulating valve 6 and a seawater tank 1. Both ends of the seawater tank 1 are successively connected in series with a high-pressure pump 2, a check valve 3, and a pressure maintaining and regulating valve 4 through pipelines. The output end of the pressure maintaining and regulating valve 4 is connected to the pressure chamber 12 through a branch pipe, and a pressure maintaining 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 of the pressure chamber 12 is subjected to closed-loop regulation control by the pressure maintaining and regulating valve 4 according to the target value of the pressure chamber 12 and the top pressure gauge 13.

[0042] The structure of the sampling channel selector 11 is as follows: It includes a rotor 1114, the interior of the rotor 1114 is a hollow structure, at one end bottom of the rotor 1114, a first flow channel 1104 and a second flow channel 1105 are distributed at intervals along the axial direction, and a third flow channel 1107 and a turbine-type flow channel 1106 are distributed at intervals along the radial direction. On the outer wall of the bottom at the other end of the rotor 1114, a guide groove 1111 is provided, and a docking pipe 1116 is provided with an opening along the radial direction at the bottom. A stator 1120 is installed in cooperation with the interior of the rotor 1114, and a buoyancy block 1109 is installed on the outer wall in the middle of the rotor 1114; the middle of the stator 1120 is a solid structure, both ends of the stator 1120 are hollow structures, a driving cavity 1108 is provided inside one end of the stator 1120, and a detachable first baffle 1103 is provided outside. Inside the other end of the stator 1120, a sampling cavity 1118 is provided, and a second baffle 1117, a branch docking port 1119 and a sampling interface 1112 are respectively provided outside. The outer end of the branch docking port 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, and a guide post 1110 is fixedly installed on the second baffle 1117, and the guide post 1110 moves along the guide groove 1111 of the rotor 1114.

[0043] A driving interface 1101 is installed outside the first baffle 1103 through a compression nut 1102.

[0044] Both the rotor 1114 and the stator 1120 are of integral structure.

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

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

[0047] It also includes a sealing ring 1115. Specifically: between the sampling cavity 1118 and the rotor 1114, a first sealing ring 11151 and a second sealing ring 11152 are used for sealing; between the driving cavity 1108 and the rotor 1114, a third sealing ring 11153 and a fourth sealing ring 11154 are used for sealing; between the docking pipe 1116 and the branch interface 1121, a fifth sealing ring 11155 is used for sealing.

[0048] The specific structure and function of the selector for the sampling channel of the pressure chamber according to the present invention are as follows:

[0049] It mainly includes a pressure chamber 12. Inside the pressure chamber 12, a sampling branch pipe 15 is provided to connect high-pressure media at different positions to a sampling channel selector 11. The sampling channel selector 11 is connected to a sampling stop valve 14 outside the chamber through a sampling pipe 16. The output end of the sampling stop valve 14 is successively and serially installed with a driving pressure regulating valve 10, a flowmeter 9, and a sampling box 8.

[0050] The sampling channel selector 11 is connected to a driving stop valve 7 outside the chamber through a driving pipe 17. The input end of the driving stop valve 7 is successively and serially installed with a sampling pressure regulating valve 6 and a seawater tank 1.

[0051] It also includes a high-pressure pump 2. After boosting the low-pressure media in the seawater tank 1, the high-pressure pump 2 transports it to the pressure chamber 12 through a check valve 3, a pressure maintaining and regulating valve 4, and a pressure maintaining stop valve 5. The pressure of the pressure chamber 12 is closed-loop regulated and controlled by the pressure maintaining and regulating valve 4 according to the target value of the pressure chamber 12 and the top pressure gauge 13.

[0052] Among them, the structure of the sampling channel selector 11 is as follows: It includes a rotor 1114. The inside of the rotor 1114 is a hollow structure. At one end of the rotor 1114, a plurality of first flow channels 1104 and second flow channels 1105 are distributed at intervals along the axial direction, and a plurality of third flow channels 1107 and turbine-type flow channels 1106 are distributed at intervals along the radial direction. On the outer wall of the bottom at the other end of the rotor 1114, a guide groove 1111 is provided, and a docking pipe 1116 is provided with a hole along the radial direction at the bottom. A stator 1120 is installed inside the rotor 1114 in a matching manner, and a buoyancy block 1109 is installed on the outer wall in the middle of the rotor 1114; the middle of the stator 1120 is a solid structure, and both ends of the stator 1120 are hollow structures. A driving cavity 1108 is provided inside one end, and a detachable first baffle 1103 is provided outside. A sampling cavity 1118 is provided inside the other end, and a non-detachable second baffle 1117 and a sampling interface 1112 are respectively provided outside. The sampling interface 1112 and a branch interface 1121 integrated block. Ball bearings 1113 are arranged 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, and the guide post 1110 moves along the guide groove 1111 of the rotor 1114.

[0053] The rotor 1114 is of an integral structure.

[0054] The stator 1120 is of an integral structure.

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

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

[0057] The sampling cavity 1118 and the rotor 1114 are sealed by a first sealing ring 11151 and a second sealing ring 11152; the drive cavity 1108 and the rotor 1114 are sealed by a third sealing ring 11153 and a fourth sealing ring 11154; the docking pipe 1116 and the branch interface 1121 are sealed by a fifth sealing ring 11155.

[0058] During the actual working process, the flow of the channel selection sampling method is as follows:

[0059] S1. Docking pipe separation:

[0060] When the rotor 1114 moves to the second baffle 1117, the first flow channel 1104 and the drive cavity 1108 are connected. Control the pressure of the drive pressure regulating valve 6 to be slightly less than the pressure of the pressure chamber 12, open the drive stop valve 7, and the high-pressure medium in the pressure chamber 12 flows into the drive cavity 1108 and the drive pipe 17 along the first flow channel 1104 in sequence and generates a reaction force. At this time, the rotor 1114 moves axially along the static body 1120 under the cooperation of the guide post 1110 and the guide groove 1111, driving the rotor 1114 to move axially along the static body 1120, so that the docking pipe 1116 and the branch interface 1121 are gradually separated;

[0061] S2. Docking pipe rotation:

[0062] When the rotor 1114 is approaching 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 in sequence and generates a reaction force. At this time, the rotor 1114 moves axially along the static body 1120 under the cooperation of the guide post 1110 and the guide groove 1111, driving the rotor 1114 to first move axially along the static body 1120 to the first baffle 1103, and then rotate circumferentially around the static body 1120 until the docking pipe 1116 and the next branch interface 1121 are concentric, and then close the drive stop valve 7;

[0063] S3. Docking pipe docking:

[0064] Control the pressure of the sampling pressure regulating valve 10 to be slightly 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 fifth sealing ring 11155 gradually inserts into the branch interface 1121. When the rotor 1114 moves to the second baffle 1117, the docking pipe 1116 and the next adjacent branch interface 1121 complete the docking;

[0065] S4. Measuring point sampling:

[0066] The high-pressure medium in the pressure chamber 12 flows successively into the branch docking interface 1119, the sampling cavity 1118, and the sampling pipeline 16 along the sampling branch pipe 15. When the flowmeter 9 feedbacks that the sample quantity meets the requirements, the sampling stop valve 14 is closed to stop sampling.

[0067] S5. Repeat S1 - S4 to make the rotor 1114 rotate circumferentially along the stator 1120, so that the docking pipeline 1116 is docked with the sampling interface 1112 one by one, and the selection and sampling of each branch connection pipe are completed respectively.

[0068] This embodiment includes components such as a sampling channel selector 11, a pressure chamber 12, a driving pressure regulating valve 6, a sampling pressure regulating valve 10, a pressure maintaining pressure regulating valve 4, pipelines, etc. The pressure in the pressure chamber 12 is 20 MPa, and the main body height is 15 meters. Ten sampling branch pipes 15 are arranged at equal intervals along the axis inside. The sampling channel selector 11 drives the stop valve 7 and the sampling stop valve 14 to separate, rotate, and dock the docking pipeline 1116 by relying on the internal pressure of the pressure chamber 12 to complete the sampling channel selection, and connect the 20 MPa high-pressure medium at different positions to the sampling channel selector 11 for sampling. When sampling in the pressure chamber 12, the low-pressure medium in the seawater tank 1 is pressurized by the high-pressure pump 2, and then transported to the pressure chamber 12 through the one-way valve 3, the pressure maintaining pressure regulating valve 4, and the pressure maintaining stop valve 5 to compensate for the pressure fluctuation caused by sampling in real time. Compared with the original sampling method, the number of through-hull interfaces is reduced from ten to two, and the number of operating valves is reduced from ten to two, simplifying the external pipelines of the cabin, and the overall integrated automatic operation is easier.

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

Claims

1. A selector for a pressure chamber sampling channel, characterized in that: The pressure chamber (12) comprises a pressure chamber (12), wherein a sampling channel selector (11) is installed inside the pressure chamber (12), and the sampling channel selector (11) is connected to high-pressure media at different locations through a sampling branch pipe (15); one end of the sampling channel selector (11) is connected to a sampling stop valve (14) outside the chamber through a sampling pipeline (16); the output end of the sampling stop valve (14) is sequentially 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 stop valve (7) outside the chamber through a driving pipeline (17); the input end of the driving stop valve (7) is sequentially connected in series with a sampling pressure regulating valve (6) and a seawater tank (1); the two ends of the seawater tank (1) are sequentially connected in series with a high-pressure pump (2), a one-way valve (3) and a pressure-maintaining pressure regulating valve (4) through pipelines; the output end of the pressure-maintaining pressure regulating valve (4) is connected to the pressure chamber (12) through a branch pipe, and a pressure-maintaining stop valve (5) is installed on the branch pipe.

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

4. A selector for a pressure chamber sampling channel as claimed in claim 1, characterized in that: The structure of the sampling channel selector (11) is as follows: it includes a rotor (1114), the interior of the rotor (1114) is a hollow structure, a first flow channel (1104) and a second flow channel (1105) are spaced apart along the axial direction at the bottom of one end of the rotor (1114), a third flow channel (1107) and a turbine flow channel (1106) are spaced apart along the radial direction, a guide groove (1111) is provided on the outer wall of the bottom of the other end of the rotor (1114), and a docking pipe (1116) is provided along the radial opening at the bottom, a stationary body (1120) is installed in the interior of 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) is a solid structure, and the stationary body (1120) is provided with a plurality of buoyancy blocks (1109). The two ends of the static body (1120) are hollow structures, one end of the static body (1120) is provided with a driving 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 docking interface (1119) and a sampling interface (1112) outside, the outer end of the branch docking interface (1119) is a branch interface (1121), the first baffle (1103) and the second baffle (1117) are provided with ball bearings (1113) on the opposite surfaces, the second baffle (1117) is fixedly mounted with a guide column (1110), and the guide column (1110) moves along the guide groove (1111) of the rotor (1114).

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

6. A selector for a pressure chamber sampling channel as claimed in claim 4, characterized in that: The rotor (1114) and the stationary body (1120) are both of an integrated structure.

7. A selector for a pressure chamber sampling channel as claimed in claim 4, characterized in that: The rotor (1114) and the stationary body (1120) are installed concentrically.

8. A selector for a pressure chamber sampling channel as claimed in claim 4, 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 column (1110).

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

10. A channel selection sampling method for a selector for a pressure chamber sampling channel according to claim 4, characterized in that: The following operation procedures are included: S1. Separation of the pipe: 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 drive pressure regulating valve (6) is controlled to be lower than the pressure of the pressure chamber (12), the drive stop valve (7) is opened, and 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 axially along the static 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 butt-jointed pipe: When the rotor (1114) is approaching the first baffle (1103), the third flow channel (1107) and the drive chamber (1108) are connected, and 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) in sequence and generates a reaction force. At this time, the rotor (1114) is driven to move axially along the stationary body (1120) to the first baffle (1103) under the cooperation of the guide column (1110) and the guide groove (1111), and then rotates circumferentially around the stationary body (1120) until the docking pipe (1116) and the next branch interface are concentric, and then the drive stop valve (7) is closed; S3. Docking work of the pipe: The pressure of the sampling pressure regulating valve (10) is controlled to be lower than the pressure of the pressure chamber (12), and the sampling stop valve (14) is opened, so that the high-pressure medium of 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, and when the rotor (1114) moves to the second baffle (1117), the docking pipe (1116) and the next adjacent branch interface are docked; S4, sampling of measuring points: The high-pressure medium in the pressure chamber (12) flows into the branch interface (1119), the sampling cavity (1118) and the sampling pipeline (16) in sequence along the sampling branch pipe (15). When the flow meter (9) feedbacks that the sample volume meets the requirements, the sampling stop valve (14) is closed to stop sampling. S5, repeat S1 to S4, so that the rotor (1114) rotates along the circumference of the stationary body (1120) to allow the docking pipes (1116) to dock with the sampling interfaces one by one, and complete the selection and sampling of each branch pipe.

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