A headspace generator and deep-sea in-situ dissolved gas detection device

Abstract

The present application relates to deep-sea exploration technology, and discloses a headspace generator and an in-situ dissolved gas detection device, which innovatively uses a deep-sea hydrostatic pressure gradient as a power source, converts environmental potential energy into hydraulic energy through a hydrostatic pressure gradient driver, specifically, uses a through-hull piston and an oil pressure accumulator to convert external water pressure into oil pressure, drives a hydraulic cylinder, and then drives the first piston of a positive displacement pump to move, expands the variable volume chamber to build a vacuum environment. The present application switches three working conditions of the sampling unit: collecting seawater, vacuumizing the first chamber, and connecting the first chamber and the second chamber, uses pressure difference to make the water sample pressure drop suddenly, realizes in-situ flash evaporation and detection of dissolved gas; the present application does not need high-power electricity, and can forcibly pull apart the vacuum chamber in deep sea in-situ by using potential energy in the process of submerging and floating, and efficiently completes gas extraction.

Description

Technical Field

[0001] This invention relates to the field of deep-sea exploration technology, specifically to a headspace generator.

[0002] The present invention also relates to a deep-sea in-situ dissolved gas detection device. Background Technology

[0003] In deep-sea scientific research, accurate detection of dissolved gases (such as methane and carbon dioxide) in seawater is crucial for understanding submarine cold seeps, hydrothermal activity, and the carbon cycle. Traditional sampling and detection methods often result in the release of dissolved gases or changes in their chemical properties due to drastic pressure and temperature changes during the process of bringing samples back to the sea surface, thus affecting the accuracy of the detection data.

[0004] Existing in-situ testing technologies typically rely on battery-powered electric pumps for suction and vacuum manufacturing, which limits the equipment's endurance and operating depth, and poses significant challenges to sealing and motor drive in high-pressure environments. Summary of the Invention

[0005] The purpose of this invention is to provide a headspace generator and a deep-sea in-situ dissolved gas detection device, which aims to solve the technical problems of existing deep-sea exploration equipment relying on electric drive, resulting in limited endurance and difficulty in overcoming the pressure of the deep sea to establish a high vacuum environment.

[0006] To solve the above-mentioned technical problems, the present invention specifically provides the following technical solution:

[0007] A headspace generator includes: a positive displacement pump, the positive displacement pump including a pump housing and a first piston disposed inside the pump housing, the first piston dividing a variable volume chamber inside the pump housing, the variable volume chamber being connected to a first chamber for containing a water sample;

[0008] The first hydrostatic pressure gradient actuator is used to convert the hydrostatic pressure of the external environment into hydraulic energy.

[0009] A hydraulic cylinder, the power output end of which is axially connected to the first piston;

[0010] The first hydrostatic pressure gradient actuator includes: a first cylinder body, which is in the shape of a circular tube;

[0011] The piston is slidably disposed inside the first cylinder body, and divides the inside of the first cylinder body into an oil chamber and a water chamber;

[0012] The hydraulic accumulator has an internal air bladder filled with compressed gas, and the hydraulic accumulator is connected to one end of the first cylinder body to communicate with the oil chamber.

[0013] A sea valve is connected to the other end of the first cylinder body to control the communication status between the water chamber and the external environment;

[0014] The sea valve piston is configured to convert the external environmental pressure entering the water chamber through the sea valve into the pressure of the hydraulic oil inside the oil chamber.

[0015] The first hydrostatic pressure gradient actuator is configured to provide a pressure difference to the hydraulic cylinder, drive the hydraulic cylinder to move, and thereby drive the first piston to move to expand the volume of the variable volume chamber to form a vacuum environment. When the first chamber is connected to the variable volume chamber, the water sample in the first chamber is extracted.

[0016] Furthermore, the hydraulic cylinder includes a power cylinder body and a second piston disposed inside the power cylinder body, the second piston dividing the interior of the power cylinder body into a power chamber and a back pressure chamber;

[0017] The first hydrostatic pressure gradient actuator further includes a first loop control valve, which is connected to the first cylinder body, the power chamber and the back pressure chamber respectively, and is configured to alternately switch to the following states: First working state: the first cylinder body is connected to the power chamber, so that the hydraulic oil pushes the second piston to move in the first direction and discharges the hydraulic oil inside the back pressure chamber;

[0018] Second working state: The first cylinder body is connected to the back pressure chamber, so that the hydraulic oil pushes the second piston to move in the second direction and discharges the hydraulic oil inside the power chamber.

[0019] Furthermore, it also includes a first three-way valve, which is configured to selectively connect the variable volume chamber to the first chamber or the external environment;

[0020] The first three-way valve is configured to have the following states: a closed state, which disconnects the variable volume chamber from the outside; and a vacuum environment is formed inside the variable volume chamber when the first piston moves along the first direction.

[0021] In the suction state, the first chamber and the variable volume chamber are connected, and the water sample inside the first chamber is transferred to the variable volume chamber by utilizing the vacuum environment inside the variable volume chamber.

[0022] In the emptied state, the variable volume chamber is connected to the external environment. When the first piston moves along the second direction, the water sample inside the variable volume chamber is squeezed out to the external environment.

[0023] Furthermore, it also includes a second hydrostatic pressure gradient actuator, which includes a second cylinder body;

[0024] The second cylinder body is connected to the second circuit control valve to receive the hydraulic oil discharged by the first hydrostatic pressure gradient actuator and to exchange functions with the first hydrostatic pressure gradient actuator during the next dive.

[0025] Furthermore, the force-bearing area of ​​the second piston is greater than that of the first piston.

[0026] Furthermore, the sea valve is configured to alternately execute the following logic: during the process of the hydraulic accumulator releasing the internal accumulated pressure, the sea valve remains closed, and the hydraulic accumulator squeezes out the hydraulic oil inside the first cylinder body;

[0027] After the pressure accumulated inside the hydraulic accumulator is released, the seawater valve opens, and the external seawater pressure squeezes the seawater piston, thereby transmitting the external environmental pressure to the hydraulic oil, forcing the gas inside the hydraulic accumulator to accumulate pressure again. After the pressure accumulation is complete, the seawater valve remains closed.

[0028] A deep-sea in-situ dissolved gas detection device includes a headspace generator, a sampling unit, and a detection unit, wherein the first chamber is part of the sampling unit, and the sampling unit further includes a second chamber;

[0029] The sampling unit is configured to have three operating conditions: First operating condition: The first chamber and the second chamber are interconnected and both are connected to the external environment to collect seawater;

[0030] Second operating condition: The first chamber and the second chamber are disconnected, the second chamber is not connected to the external environment, and the first chamber is connected to the variable volume chamber that has been evacuated, thereby creating a vacuum environment inside the first chamber;

[0031] Third operating condition: The first chamber and the second chamber are connected to each other and are not connected to the external environment. The low-pressure environment of the second chamber is used to cause a sudden drop in the pressure in the first chamber, so that the dissolved gas in the water sample is released and accumulates at the top of the first chamber.

[0032] Furthermore, the detection unit includes a pressure sensor and a methane sensor, the probes of which are mounted on the top of the first chamber and configured to detect the pressure and composition of the flashed gas phase.

[0033] Furthermore, the sampling unit also includes a first shut-off valve, a second three-way valve, and a second shut-off valve;

[0034] The second three-way valve connects the first chamber, the second chamber, and the variable volume chamber.

[0035] Furthermore, the first chamber and the second chamber are arranged in a vertically coaxial configuration.

[0036] The advantages of this invention compared to the prior art are:

[0037] This invention provides a headspace generator that innovatively utilizes the hydrostatic pressure gradient existing in the deep sea as a power source. It uses the environmental potential energy during the descent or ascent of the headspace generator to convert it into a huge thrust that drives the first piston of the volumetric pump. This forces the vacuum chamber to open in situ in the deep sea, enabling the in-situ dissolved gas detection device to perform flash extraction and detection of water samples in the sampling unit. Attached Figure Description

[0038] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0039] Figure 1 This is a system diagram of the headspace generator according to an embodiment of the present invention;

[0040] Figure 2 This is a system diagram of the deep-sea in-situ dissolved gas detection device according to an embodiment of the present invention;

[0041] The labels in the diagram represent the following:

[0042] 1-Polydisplacement pump; 11-Pump casing; 111-Variable volume chamber; 12-First piston; 13-First three-way valve;

[0043] 2-First hydrostatic pressure gradient actuator; 21-First cylinder body; 211-Oil chamber; 212-Water chamber; 22-Sea valve piston; 23-Hydraulic accumulator; 231-Airbag; 24-Sea valve; 25-First circuit control valve;

[0044] 3-Hydraulic cylinder; 31-Power cylinder body; 32-Second piston; 33-Piston rod;

[0045] 4-Second hydrostatic pressure gradient actuator; 41-Second cylinder body; 42-Second circuit control valve;

[0046] 5-Sampling unit; 51-First shut-off valve; 52-First chamber; 53-Second three-way valve; 54-Second chamber; 55-Second shut-off valve;

[0047] 6-Detection unit. Detailed Implementation

[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] refer to Figure 1 and Figure 2 This embodiment provides a deep-sea in-situ dissolved gas detection device, the core of which includes a headspace generator, a sampling unit 5 and a detection unit 6.

[0050] refer to Figure 1 The headspace generator, as the core power and suction component, includes a positive displacement pump 1, a first hydrostatic pressure gradient actuator 2, and a hydraulic cylinder 3.

[0051] To address the technical challenges of energy constraints and the difficulty in overcoming high environmental pressure during wastewater discharge in deep-sea exploration, the first hydrostatic pressure gradient actuator 2 is configured to convert the hydrostatic pressure of the external environment into hydraulic energy and use this energy to provide a pressure difference to the hydraulic cylinder 3.

[0052] Specifically, the first hydrostatic pressure gradient actuator 2 includes a first cylinder body 21 in the shape of a circular tube. A sea valve piston 22 is slidably disposed inside the first cylinder body 21. The sea valve piston 22 divides the interior of the first cylinder body 21 into an oil chamber 211 and a water chamber 212 that are not connected to each other.

[0053] In order to store energy using ambient pressure, a hydraulic accumulator 23 is connected to one end of the first cylinder body 21. The hydraulic accumulator 23 is connected to the oil chamber 211, and an air bladder 231 filled with compressed gas is installed inside the hydraulic accumulator 23. At the same time, a sea valve 24 is connected to the other end of the first cylinder body 21. The sea valve 24 is used to control the connection between the water chamber 212 and the external environment.

[0054] Furthermore, in order to utilize the huge hydrostatic pressure difference in the deep sea as a driving force, the first hydrostatic pressure gradient actuator 2 follows the energy management logic of "deep concentration and shallow release".

[0055] Specifically, the sea valve 24 is configured to alternately execute the following logic:

[0056] During the device's descent, when the sea valve 24 is opened, the external seawater pressure squeezes the sea valve piston 22, thereby transmitting the external environmental pressure to the hydraulic oil in the oil chamber 211. This forces the air bladder 231 inside the hydraulic accumulator 23 to be compressed, thus accumulating pressure. After the pressure is fully accumulated, the sea valve 24 remains closed to lock in the energy.

[0057] When the hydraulic accumulator 23 needs to release the internal accumulated pressure (e.g., at a shallow depth or when a high-energy-consuming action needs to be performed), the sea valve 24 remains closed, and the hydraulic accumulator 23 squeezes out the high-pressure hydraulic oil inside the first cylinder body 21.

[0058] This design allows the device to accumulate pressure at deeper seawater levels and then release that pressure at the next gradient (shallower seawater levels), thereby overcoming environmental pressure to expel the seawater from inside the positive displacement pump 1.

[0059] In order to convert the hydraulic energy output by the first hydrostatic pressure gradient driver 2 into mechanical motion, the power output end of the hydraulic cylinder 3 is axially connected to the first piston 12 of the positive displacement pump 1.

[0060] Specifically, the hydraulic cylinder 3 includes a power cylinder body 31 and a second piston 32 disposed inside the power cylinder body 31. The second piston 32 divides the interior of the power cylinder body 31 into a power chamber and a back pressure chamber. The second piston 32 is axially connected to the first piston 12 through the piston rod 33.

[0061] In order to control the flow of hydraulic oil to achieve reciprocating motion, the first hydrostatic pressure gradient actuator 2 also includes a first circuit control valve 25, which is connected to the first cylinder body 21, the power chamber and the back pressure chamber respectively.

[0062] The first loop control valve 25 is configured to alternately switch to the first operating state or the second operating state.

[0063] When in the first working state, the first cylinder body 21 is connected to the power chamber, so that the hydraulic oil pushes the second piston 32 to move in the first direction and discharges the hydraulic oil inside the back pressure chamber.

[0064] When in the second working state, the first cylinder body 21 is connected to the back pressure chamber, so that the hydraulic oil pushes the second piston 32 to move in the second direction and discharges the hydraulic oil inside the power chamber.

[0065] Preferably, in order to improve driving capability, the force-bearing area of ​​the second piston 32 is greater than that of the first piston 12.

[0066] Furthermore, in order to achieve the construction of a vacuum environment and the transfer of fluid, the positive displacement pump 1 includes a pump housing 11 and a first piston 12 disposed inside the pump housing 11. The first piston 12 divides the pump housing 11 into a variable volume chamber 111.

[0067] The variable volume chamber 111 is connected to the first chamber 52 for containing water samples.

[0068] In order to precisely control the on / off logic of the variable volume chamber 111, the headspace generator also includes a first three-way valve 13, which is configured to selectively connect the variable volume chamber 111 to the first chamber 52 or the external environment.

[0069] Specifically, the first three-way valve 13 has three states:

[0070] In the closed state, the variable volume chamber 111 is disconnected from the outside. When the first hydrostatic pressure gradient actuator 2 drives the first piston 12 to move in the first direction, a vacuum environment is formed inside the variable volume chamber 111.

[0071] In the suction state, the first chamber 52 and the variable volume chamber 111 are connected, and the water sample inside the first chamber 52 is transferred to the variable volume chamber 111 by utilizing the vacuum environment inside the variable volume chamber 111.

[0072] In the emptied state, the variable volume chamber 111 is connected to the external environment. When the first piston 12 moves in the second direction, it squeezes the water sample inside the variable volume chamber 111 into the external environment.

[0073] To enable the recycling of power and support multiple sampling, the headspace generator also includes a second hydrostatic pressure gradient driver 4, which has the same structure as the first hydrostatic pressure gradient driver 2.

[0074] The second hydrostatic pressure gradient actuator 4 includes a second cylinder body 41. During the descent, the sea valve of the second hydrostatic pressure gradient actuator 4 needs to be kept closed, so that the pressure inside the second cylinder body 41 is always less than the pressure inside the first cylinder body 21.

[0075] The second cylinder body 41 is connected to the power chamber and back pressure chamber of the hydraulic cylinder 3 through the second circuit control valve 42. It is used to contain the hydraulic oil discharged by the first hydrostatic pressure gradient actuator 2 and to exchange functions with the first hydrostatic pressure gradient actuator 2 during the next dive.

[0076] This means that the second oil cylinder 41, which serves as a waste oil collection container in this cycle, will be converted into a power source in the next operation, thereby effectively extending the operating range of the device.

[0077] refer to Figure 2In order to complete the sampling and detection of dissolved gases, the deep-sea in-situ dissolved gas detection device also includes a sampling unit 5 and a detection unit 6. The first chamber 52 is part of the sampling unit 5, and the sampling unit 5 also includes a second chamber 54. The first chamber 52 and the second chamber 54 are connected vertically and coaxially, which is conducive to gas-liquid separation.

[0078] To control the sampling process, the sampling unit 5 also includes a first shut-off valve 51, a second three-way valve 53, and a second shut-off valve 55, wherein the second three-way valve 53 is connected to the first chamber 52, the second chamber 54, and the variable volume chamber 111.

[0079] Sampling unit 5 is configured to have three operating conditions:

[0080] In the first operating condition, the first chamber 52 and the second chamber 54 are interconnected and both are connected to the external environment to collect seawater.

[0081] In the second operating condition, the first chamber 52 and the second chamber 54 are disconnected, the second chamber 54 is not connected to the external environment, and the first chamber 52 is connected to the variable volume chamber 111 that has been evacuated, thereby creating a vacuum environment inside the first chamber 52.

[0082] In the third operating condition, the first chamber 52 and the second chamber 54 are connected to each other and are not connected to the external environment. The low-pressure environment of the second chamber 54 is used to cause the pressure in the first chamber 52 to drop sharply, so that the dissolved gas in the water sample is released and accumulates at the top of the first chamber 52.

[0083] Finally, in order to acquire detection data, the detection unit 6 includes a pressure sensor and a methane sensor. The probes of the pressure sensor and the methane sensor are mounted on the top of the first chamber 52 and configured to detect the pressure and composition of the flashed gas phase.

[0084] Through the combination of the above structure and steps, the present invention effectively solves the problems of energy supply and high-pressure emission in deep-sea in-situ exploration, and realizes efficient and reliable in-situ dissolved gas detection.

[0085] The overall working principle of this invention is as follows:

[0086] Phase 1: Preparation and Dive Charging.

[0087] Initial settings: Before deployment on the deck, ensure that the sampling unit 5 is emptied or in its initial state; at the same time, ensure that the hydraulic accumulator 23 of the first hydrostatic pressure gradient driver 2 is in a depressurized state.

[0088] Potential energy accumulation: As the device descends with the submersible, the sea passage valve 24 of the first hydrostatic pressure gradient actuator 2 is opened. As the depth increases, the external hydrostatic pressure acts on the sea passage piston 22, compressing the air bladder 231 inside the hydraulic accumulator 23. At this time, the huge environmental potential energy of the deep sea is converted into elastic potential energy and hydraulic energy inside the air bladder 231, completing in-situ charging.

[0089] Pressure lockout: After reaching the predetermined depth, the seawater valve 24 is closed. At this time, the incompressible seawater in the water chamber 212 forms a hydraulic lock, locking the seawater piston 22 and making it a stable rear wall for subsequent power release.

[0090] Phase Two: Seawater Sampling.

[0091] Through-cleaning: The control sampling unit 5 enters the first working condition, opens the first shut-off valve 51 and the second shut-off valve 55, and adjusts the second three-way valve 53 to connect the first chamber 52 and the second chamber 54; at this time, the outside seawater flows through the first shut-off valve 51, the first chamber 52, the second three-way valve 53, the second chamber 54, and the second shut-off valve 55 under the pressure of the deep sea or the movement of the submersible, completing the cleaning and replacement of the pipeline and chambers.

[0092] Sample locking: After the inside of the sampling unit 5 is filled with fresh in-situ seawater sample, the first shut-off valve 51 and the second shut-off valve 55 are closed, and the second three-way valve 53 is adjusted to disconnect the connection between the first chamber 52 and the second chamber 54. At this time, the first chamber 52 and the second chamber 54 are both sealed with seawater sample with in-situ pressure.

[0093] Phase 3: Constructing a vacuum.

[0094] Power release: Switch the first circuit control valve 25 to the first working state, and the hydraulic accumulator 23 releases high-pressure hydraulic oil to drive the hydraulic cylinder 3 to move.

[0095] Forced suction: The movement of the hydraulic cylinder 3 drives the first piston 12 of the volumetric pump 1 to forcefully suction through the piston rod 33. During this process, the first three-way valve 13 is controlled to be closed, so that the variable volume chamber 111 is isolated from the outside. As the first piston 12 moves, the physical volume of the variable volume chamber 111 is forcibly expanded, creating a high vacuum environment inside.

[0096] Phase 4: Flash Evaporation and In-situ Detection.

[0097] Creating headspace: Control the operation of the first three-way valve 13 and the second three-way valve 53 to connect the variable volume chamber 111, which has been evacuated, with the first chamber 52. Utilize the extremely low pressure of the variable volume chamber 111 to instantly reduce the pressure inside the first chamber 52, putting it into a evacuated state (and all the water sample is transferred to the variable volume chamber 111 to create headspace).

[0098] Creating gas-liquid balance: Control the first three-way valve 13 and the second three-way valve 53 again to connect the first chamber 52 and the second chamber 54, and disconnect the variable volume chamber 111 from the first chamber 52. A violent pressure balance process occurs inside the sampling unit 5.

[0099] Gas Emission and Detection: According to Henry's Law, a sudden drop in pressure causes trace amounts of gas (such as methane) dissolved in the water sample to rapidly flash and precipitate, accumulating at the top of the first chamber 52, which is located higher. At this time, the detection unit 6 installed at this position performs in-situ detection of the accumulated gas phase components.

[0100] Phase 5: Reset.

[0101] Drainage: After the test is completed, switch the first circuit control valve 25 to the second working state, drive the hydraulic cylinder 3 to move in the opposite direction, and switch the first three-way valve 13 to the drainage state to discharge the waste liquid in the variable volume chamber 111, in preparation for the next cycle.

[0102] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within its spirit and scope of protection, and such modifications or equivalent substitutions should also be considered as falling within the scope of protection of the embodiments of the present invention.

Claims

1. A headspace generator, characterized in that, include: A positive displacement pump (1) includes a pump housing (11) and a first piston (12) disposed inside the pump housing (11). The first piston (12) divides a variable volume chamber (111) inside the pump housing (11), and the variable volume chamber (111) is connected to a first chamber (52) for containing a water sample. The first hydrostatic pressure gradient actuator (2) is used to convert the hydrostatic pressure of the external environment into hydraulic energy. The hydraulic cylinder (3) has its power output end axially connected to the first piston (12); The first hydrostatic pressure gradient actuator (2) includes: The first cylinder body (21) is in the shape of a round tube; The piston (22) is slidably disposed inside the first cylinder body (21) and divides the inside of the first cylinder body (21) into an oil chamber (211) and a water chamber (212). The hydraulic accumulator (23) has an air bladder (231) filled with compressed gas inside, and the hydraulic accumulator (23) is connected to one end of the first cylinder body (21) to communicate with the oil chamber (211); A sea valve (24) is connected to the other end of the first cylinder body (21) to control the communication state between the water chamber (212) and the external environment; The sea valve piston (22) is configured to convert the external environmental pressure entering the water chamber (212) via the sea valve (24) into the pressure of the hydraulic oil inside the oil chamber (211); The first hydrostatic pressure gradient actuator (2) is configured to provide a pressure difference to the hydraulic cylinder (3), drive the hydraulic cylinder (3) to move, and then drive the first piston (12) to move to expand the volume of the variable volume chamber (111) to form a vacuum environment. When the first chamber (52) is connected to the variable volume chamber (111), the water sample in the first chamber (52) is extracted.

2. The headspace generator as described in claim 1, characterized in that, The hydraulic cylinder (3) includes a power cylinder body (31) and a second piston (32) disposed inside the power cylinder body (31). The second piston (32) divides the interior of the power cylinder body (31) into a power chamber and a back pressure chamber. The first hydrostatic pressure gradient actuator (2) further includes a first loop control valve (25), which is connected to the first cylinder body (21), the power chamber, and the back pressure chamber, and is configured to alternately switch to the following states: First working state: The first cylinder body (21) is connected to the power chamber, so that the hydraulic oil pushes the second piston (32) to move in the first direction and discharges the hydraulic oil inside the back pressure chamber; Second working state: The first cylinder body (21) is connected to the back pressure chamber, so that the hydraulic oil pushes the second piston (32) to move in the second direction and discharges the hydraulic oil inside the power chamber.

3. The headspace generator as described in claim 2, characterized in that, It also includes a first three-way valve (13), which is configured to selectively connect the variable volume chamber (111) to the first chamber (52) or the external environment; The first three-way valve (13) is configured to have the following states: In the closed state, the variable volume chamber (111) is disconnected from the outside. When the first piston (12) moves along the first direction, a vacuum environment is formed inside the variable volume chamber (111). In the suction state, the first chamber (52) and the variable volume chamber (111) are connected, and the water sample inside the first chamber (52) is transferred to the variable volume chamber (111) by utilizing the vacuum environment inside the variable volume chamber (111). In the emptied state, the variable volume chamber (111) is connected to the external environment. When the first piston (12) moves along the second direction, the water sample inside the variable volume chamber (111) is squeezed out to the external environment.

4. The headspace generator as described in claim 2, characterized in that, It also includes a second hydrostatic pressure gradient actuator (4), which includes a second cylinder body (41). The second cylinder body (41) is connected to the second circuit control valve (42) to contain the hydraulic oil discharged by the first hydrostatic pressure gradient actuator (2) and to exchange functions with the first hydrostatic pressure gradient actuator (2) during the next dive.

5. The headspace generator as described in claim 2, characterized in that, The force-bearing area of ​​the second piston (32) is greater than that of the first piston (12).

6. The headspace generator as described in claim 1, characterized in that, The sea valve (24) is configured to alternately execute the following logic: During the process of the hydraulic accumulator (23) releasing the internal accumulated pressure, the sea valve (24) remains closed, and the hydraulic accumulator (23) squeezes out the hydraulic oil inside the first cylinder body (21); After the pressure accumulated inside the hydraulic accumulator (23) is released, the sea valve (24) opens, and the external seawater pressure squeezes the sea piston (22), thereby transmitting the external environmental pressure to the hydraulic oil, forcing the gas inside the hydraulic accumulator (23) to accumulate pressure again. After the pressure accumulation is completed, the sea valve (24) remains closed.

7. A deep-sea in-situ dissolved gas detection device, characterized in that, The headspace generator according to any one of claims 1-6 further includes a sampling unit (5) and a detection unit (6), wherein the first chamber (52) is part of the sampling unit (5), and the sampling unit (5) further includes a second chamber (54). The sampling unit (5) is configured to have three operating conditions: First working condition: The first chamber (52) and the second chamber (54) are connected to each other and are both connected to the external environment to collect seawater; Second operating condition: The first chamber (52) and the second chamber (54) are disconnected, the second chamber (54) is not connected to the external environment, and the first chamber (52) is connected to the variable volume chamber (111) that has been evacuated, thereby forming a vacuum environment inside the first chamber (52); Third working condition: The first chamber (52) and the second chamber (54) are connected to each other and are not connected to the external environment. The low pressure environment of the second chamber (54) is used to make the pressure in the first chamber (52) drop sharply, so that the dissolved gas in the water sample is released and accumulates at the top of the first chamber (52).

8. The deep-sea in-situ dissolved gas detection device as described in claim 7, characterized in that, The detection unit (6) includes a pressure sensor and a methane sensor. The probes of the pressure sensor and the methane sensor are mounted on the top of the first chamber (52) and configured to detect the pressure and composition of the flashed gas phase.

9. The deep-sea in-situ dissolved gas detection device as described in claim 7, characterized in that, The sampling unit (5) also includes a first shut-off valve (51), a second three-way valve (53), and a second shut-off valve (55); The second three-way valve (53) connects the first chamber (52), the second chamber (54), and the variable volume chamber (111).

10. The deep-sea in-situ dissolved gas detection device as described in claim 7, characterized in that, The first chamber (52) and the second chamber (54) are arranged in a vertically coaxial configuration.

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