An active pressure compensator for deep-sea sampling and a pressure compensation method thereof

Abstract

The present application relates to the technical field of deep-sea sampling pressure maintaining, and provides an active pressure compensator for deep-sea sampling and a pressure compensation method thereof, the active pressure compensator comprising a spring water supplementing cylinder, a cam pressure compensating pump and a circuit cavity, the spring water supplementing cylinder being used for providing compensation liquid for the cam pressure compensating pump; the cam pressure compensating pump being arranged to be capable of sucking liquid from the spring water supplementing cylinder and pumping out liquid to the circuit cavity; the circuit cavity being used for being connected with a pressure mechanism to be compensated, and being internally provided with a pressure sensor and a control circuit board, the pressure sensor being used for detecting the pressure of the liquid output by the cam pressure compensating pump and the pressure mechanism to be compensated, and the control circuit board being used for sending a control instruction based on the pressure data fed back by the pressure sensor to control the working of the cam pressure compensating pump, so as to realize active pressure compensation for the pressure mechanism to be compensated; the active pressure compensator can actively maintain the pressure for the pressure mechanism to be compensated within the range of 6000 meters of ocean depth, has simple and compact overall structure, small volume, high safety and strong adaptability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of deep-sea sampling pressure maintaining, in particular to an active pressure compensator for deep-sea sampling and a pressure compensation method thereof. BACKGROUND

[0002] The sea area with a depth exceeding 1000m is defined as deep sea, accounting for 88% of the total ocean coverage and 75% of the total ocean volume, and contains rich mineral, biological, oil and gas and genetic resources. As one of deep-sea exploration technologies, sampling and detection technology brings back valuable samples of marine minerals, microorganisms, water quality, etc., and provides important help for exploring marine resources and promoting biological and ecological research.

[0003] Pressure is an important factor that cannot be ignored when obtaining seabed samples. Pressure plays an important role in ensuring the stability of samples, the activity and integrity of microbial proteins. Moreover, pressure is extremely important for keeping the dissolved gas in the sample from volatilizing and the physicochemical properties of hydrates unchanged. For scenarios that require laboratory analysis of samples, not only is it necessary to ensure the stability of sample pressure during sampling, but it is also necessary to ensure the stability of sample pressure during sample transfer after sampling. Therefore, ensuring the stability of sample pressure during sampling and the research of pressure maintaining technology are of great significance to sample fidelity and scientific research. The pressure of seawater increases with the increase of depth, and the highest pressure exceeds 110MPa, located in the Mariana Trench with a depth of 10909 meters. During the recovery of samples, the external seawater pressure decreases continuously, and if no measures are taken to maintain the stability of pressure, the effectiveness of the samples will be greatly reduced. Therefore, the research of deep-sea sampling pressure maintaining technology is of great significance.

[0004] In the field of water body sampling, existing research work can be divided into non-pressure compensated sampling, passive pressure compensated sampling and active pressure compensated sampling according to whether the sample is pressure compensated. Non-pressure compensated sampling is a sampling method that tolerates pressure loss during the recovery process without any pressure compensation after the sample collection is completed. Non-pressure compensated sampling is commonly used in fields that are not sensitive to sample pressure and shallow water sampling. Non-pressure compensated sampling inevitably has pressure loss during the sampling and recovery process, and cannot maintain the in-situ pressure. Passive pressure compensated sampling, also commonly known as accumulator sampling, generally pre-charges pressure gas into the accumulator in advance, and when the external environment pressure decreases, the pre-charged gas in the accumulator is released to achieve pressure compensation of the sample. Although passive pressure compensated sampling is relatively convenient, it has the characteristics of operation danger and inaccurate pressure compensation. Active pressure compensated sampling is to realize active pressure compensation of the sample through an external pressure compensation device, and to detect the pressure of the collected sample in real time and compensate the pressure. Active pressure compensated sampling can actively adjust the pressure of the sample to ensure stable sample pressure, but to some extent, it increases the complexity of the structure. For example, the Chinese patent application with publication number CN114459818A discloses an active liquid precise compensation device and method for deep-sea pressure compensated sampler, which uses three groups of motors, reduction boxes and screw nuts to drive three different area pistons to pressurize the sampling cylinder. The structure is very complex. In addition, this scheme relies on the environment pressure and the thrust of the motor to the screw to pressurize the piston cylinder. If the environment pressure is low, the requirements for the motor, reducer and screw nut are very high. For example, the Chinese patent application with publication number CN113251148A discloses an active pressure compensation device and deep-sea pressure compensated sampling system, which uses a motor, a gear transmission and a screw transmission to drive a piston to pressurize the compensation liquid. However, the pressurized compensation liquid only prevents the axial movement of the sealing ring to cause pressure reduction, and cannot compensate the pressure after the pressure reduction. The gas accumulator plays a compensating role after the pressure reduction, which is essentially passive pressure compensation and cannot accurately compensate the pressure.

[0005] Therefore, in general, the existing active pressure compensation device has the defects of complex structure, large volume, small applicable pressure, limited use and low safety. SUMMARY

[0006] An object of the present application is to provide an active pressure compensator for deep-sea sampling and a pressure compensation method thereof, which has the advantages of simple structure, small volume, wide applicable pressure range and high safety.

[0007] The application provides an active pressure compensator for deep-sea sampling, comprising a spring water supplementing cylinder, a cam pressure pump connected to the spring water supplementing cylinder, and a circuit cavity connected to the cam pressure pump, wherein,

[0008] The spring water supplementing cylinder is used to provide liquid for the cam pressure pump, and the liquid is at least 0.5 MPa higher than the ambient pressure.

[0009] The cam pressure pump is arranged to suck liquid from the spring water supplementing cylinder and pump the liquid to the circuit cavity.

[0010] The circuit cavity is used to be connected to a pressure compensating mechanism, and is internally provided with a pressure sensor and a control circuit board communicatively connected to the pressure sensor, the pressure sensor is used to detect the pressure of the liquid output by the cam pressure pump and the pressure compensating mechanism, and the control circuit board is used to send control instructions to control the working of the cam pressure pump based on the pressure data fed back by the pressure sensor, so as to realize active pressure compensation for the pressure compensating mechanism.

[0011] Optionally, the cam pressure pump comprises a liquid cavity and a liquid inlet valve and a liquid outlet valve communicating with the liquid cavity, and the liquid inlet valve and the liquid outlet valve are respectively connected to the spring water supplementing cylinder and the circuit cavity.

[0012] Optionally, the cam pressure pump further comprises a plunger capable of moving axially along the cam pressure pump, a rotation-stopping member connected to the plunger, a roller assembly connected to the rotation-stopping member, a cam connected to the roller assembly, and a driving motor for driving the cam to rotate, wherein when the driving motor drives the cam to rotate, the cam applies an axial pushing force to the roller assembly, so that the roller assembly pushes the plunger to move axially towards the liquid cavity through the rotation-stopping member, and then pumps the liquid in the liquid cavity out through the liquid outlet valve.

[0013] Optionally, the liquid inlet valve and the liquid outlet valve are both one-way valves.

[0014] Optionally, the plunger is sleeved with a first elastic member, the first elastic member is used to store elastic potential energy when the plunger is pushed to move by the rotation-stopping member, and is used to release the elastic potential energy when the pushing force of the rotation-stopping member to the plunger disappears, so that the plunger, the rotation-stopping member and the cam return to the original position, wherein when the plunger, the rotation-stopping member and the cam return to the original position, the cam pressure pump sucks liquid into the liquid cavity through the liquid inlet valve.

[0015] Optionally, the cam compensating pump comprises a front cavity, an intermediate cavity connected to the front cavity, a motor cavity connected to the intermediate cavity, and a motor cover connected to the motor cavity, wherein the liquid cavity, the liquid inlet valve and the liquid outlet valve are arranged in the front cavity, the plunger, the rotation-stopping piece, the roller assembly, the cam and the driving motor are arranged in the cavity through the intermediate cavity and the motor cavity, and a combined shaft seal is arranged between the plunger and the front cavity to seal the liquid cavity.

[0016] Optionally, bolts or screws are used to connect the front cavity, the intermediate cavity, the motor cavity and the motor cover.

[0017] Optionally, the cam compensating pump further comprises a motor coupling for fixing the driving motor in the motor cavity.

[0018] Optionally, the cam compensating pump further comprises a ball arranged between the rotation-stopping piece and the front cavity, the ball being used to circumferentially constrain the rotation-stopping piece to avoid rotation of the rotation-stopping piece, the rotation-stopping piece having a front end, an intermediate end and a rear end connected in sequence, the cam compensating pump further comprising a plunger coupling for fixedly connecting the plunger to the front end of the rotation-stopping piece and an e-shaped check ring, and the cam compensating pump further comprising a roller shaft arranged at the rear end of the rotation-stopping piece, and the roller assembly is rotatably arranged on the roller shaft.

[0019] Optionally, the cam has a linkage end and a driving end extending from the linkage end, the linkage end and the driving end being connected to the roller assembly and the rotating shaft of the driving motor respectively, and a bearing assembly is further arranged between the outer side of the driving end and the inner side wall of the intermediate cavity.

[0020] Optionally, the motor cover is provided with a first interface for connecting with an oil bag, a second interface for connecting with the circuit cavity, and a third interface for connecting with the motor cavity, wherein the first interface and the third interface are communicated.

[0021] Optionally, the spring water compensating cylinder comprises a water compensating interface and an end cover arranged at two ends thereof respectively, a valve core for controlling opening and closing of the water compensating interface, a water compensating cavity communicated with the water compensating interface, a piston arranged at a side of the water compensating cavity away from the valve core, a second elastic member having one end abutting against the piston and the other end inserted with the end cover, and a containing cavity for mounting the second elastic member.

[0022] Optionally, two guide rings and a sealing ring arranged between the two guide rings are arranged on the piston.

[0023] Optionally, the circuit cavity comprises a shell, a circuit chamber formed inside the shell, and an interface part and a pressure compensation part respectively arranged at two ends of the shell, wherein the interface part is provided with a first connecting interface for connecting with a watertight connector to debug and communicate with the control circuit board inside the circuit chamber and a second connecting interface for connecting with the cam pressure compensation pump; the pressure compensation part comprises a pressure compensation inlet connected with the liquid outlet valve of the cam pressure compensation pump, a mounting cavity for mounting the pressure sensor, a sensor plug for fixing the pressure sensor in the mounting cavity, a copper column connected with the sensor plug and located inside the circuit chamber, and a pressure compensation outlet communicating the pressure compensation inlet and the mounting cavity; the control circuit board is mounted on the copper column, and a battery is further arranged inside the circuit chamber, and the circuit cavity is connected with the pressure compensation mechanism through the pressure compensation outlet.

[0024] Optionally, the pressure compensation mechanism is a sampling cylinder.

[0025] Optionally, the active pressure compensator further comprises an oil bag connected with the cam pressure compensation pump, and further comprises a mounting frame for mounting the cam pressure compensation pump, the spring water compensation cylinder, the circuit cavity and the oil bag, wherein the mounting frame is a double-layer structure, the cam pressure compensation pump and the circuit cavity are arranged in the first layer of the mounting frame, the spring water compensation cylinder and the oil bag are arranged in the second layer of the mounting frame, and the position of the spring water compensation cylinder corresponds to the cam pressure compensation pump, and the position of the oil bag corresponds to the circuit cavity.

[0026] In another aspect, the application further provides a pressure compensation method of the active pressure compensator for deep-sea sampling, comprising the steps of:

[0027] The pressure sensor of the circuit cavity detects the pressure of the liquid output by the cam pressure compensation pump and the pressure compensation mechanism;

[0028] The control circuit board of the circuit cavity receives the pressure data detected by the pressure sensor, and sends a control instruction to the driving motor of the cam pressure compensation pump when the pressure is lower than the set pressure;

[0029] The driving motor receives the control instruction to pump the liquid in the cam pressure compensation pump to the circuit cavity, and compensates the pressure to the pressure compensation mechanism through the pressure compensation outlet of the circuit cavity, so as to realize active pressure compensation.

[0030] Optionally, the pressure compensation method of the active pressure compensator for deep-sea sampling further comprises the steps of:

[0031] Connecting the water compensation interface of the spring water compensation cylinder with the water compensation pump to fill the water compensation cavity of the spring water compensation cylinder with the water compensation pump;

[0032] Remove the water supply pump and connect the water supply interface to the cam-type pressure pump. The second elastic element of the spring water supply cylinder acts on the piston, thereby transmitting the pressure to the liquid in the water supply chamber. Open the valve core to provide the cam-type pressure pump with liquid at least 0.5 MPa higher than the ambient pressure.

[0033] The present invention has the following beneficial effects:

[0034] (1) The active pressure compensator for deep-sea sampling of the present invention can actively maintain pressure for the sampler within a depth of 6,000 meters in the ocean. The overall structure is compact and can provide pressure for any mechanism that needs pressure replenishment. It is highly adaptable.

[0035] (2) The present invention uses a cam-compensating pump for active pressure compensation, which is applicable to small flow control of 60MPa and has a wider range of applications;

[0036] (3) The spring water supply cylinder of the present invention can provide the cam pressure pump with compensation liquid at least 0.5 MPa higher than the ambient pressure. Compared with the gas compensation method, the liquid compensation method is safer and more convenient to use.

[0037] (4) The circuit cavity of the present invention integrates control, power supply, pressure measurement and pressure liquid output functions, with rich functions and compact structure, and can realize automatic active pressure compensation control.

[0038] The further objects and advantages of the invention will become fully apparent from the following description and accompanying drawings. Attached Figure Description

[0039] Figure 1 This is a three-dimensional structural schematic diagram of an active pressure compensator for deep-sea sampling according to a preferred embodiment of the present invention.

[0040] Figure 2 for Figure 1 The diagram shown is a three-dimensional structural schematic of the active pressure compensator for deep-sea sampling from another perspective.

[0041] Figure 3 for Figure 1 The diagram shows a cross-sectional view of the cam-driven pressure compensation pump of the active pressure compensator for deep-sea sampling.

[0042] Figure 4 for Figure 3 The image shows a front view of the motor cover of the cam-assisted pressure pump.

[0043] Figure 5 for Figure 1 The diagram shown is a cross-sectional view of the spring water supply cylinder of the active pressure compensator for deep-sea sampling.

[0044] Figure 6For Figure 1 FIG. 6 is a cross-sectional view schematically showing a circuit cavity of the active pressure compensator for deep-sea sampling shown in FIG. 1.

[0045] BRIEF DESCRIPTION OF DRAWINGS

[0046] cam pressure compensation pump 1; front cavity 1-1; liquid cavity 1-2; liquid outlet valve 1-3; shaft combined seal 1-4; plunger 1-5; first elastic member 1-6; plunger shaft coupling 1-7; bolt 1-8; ball 1-9; e-shaped retainer ring 1-10; rotation stopper 1-11; roller shaft 1-12; roller assembly 1-13; intermediate cavity 1-14; cam 1-15; motor cavity 1-16; motor shaft coupling 1-17; driving motor 1-18; motor cover 1-19; first interface 1-19-1; second interface 1-19-2; third interface 1-19-3; bearing assembly 1-20; liquid inlet valve 1-21;

[0047] spring water compensation cylinder 2; front end of water compensation cylinder 2-1; valve core 2-2; guide ring 2-3; sealing ring 2-4; piston 2-5; second elastic member 2-6; containing cavity 2-7; end cover 2-8; rear end of water compensation cylinder 2-9; water compensation interface 2-10; water compensation cavity 2-11;

[0048] circuit cavity 3; shell 3-1; copper column 3-2; sensor plug 3-3; second sealing ring 3-4; circuit cavity end cover 3-5; pressure compensation inlet 3-6; pressure compensation outlet 3-7; mounting cavity 3-8; first connection interface 3-9; second connection interface 3-10;

[0049] first pipe 5; second pipe 6; mounting bracket 7. DETAILED DESCRIPTION

[0050] The following description is provided to enable those skilled in the art to implement the present application. The preferred embodiments in the following description are only examples of the present application and other obvious modifications are possible by those skilled in the art. The basic principles defined in the following description can be applied to other embodiments, modifications, improvements, equivalents and other technical solutions without departing from the spirit and scope of the present application.

[0051] Those skilled in the art should understand that in the disclosure of the present application, the orientation or positional relationship indicated by the terms "vertical", "horizontal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the above terms cannot be understood as a limitation of the present application.

[0052] It can be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of one element can be one, and in another embodiment, the number of the element can be multiple, and the term "one" cannot be understood as a limitation on the number.

[0053] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, or it can be electrically connected or can communicate with each other, it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0054] In order to solve the technical problems of the existing active pressure compensation device, such as complex structure, large volume, small applicable pressure, limited use and low safety, the present application provides an active pressure compensator for deep-sea sampling and a pressure compensation method thereof. As shown in Figures 1 to 6 The specific structure of an active pressure compensator for deep-sea sampling according to a preferred embodiment of the present application is illustrated.

[0055] The overall schematic diagram of the active pressure compensator for deep-sea sampling provided by the present application is shown in Figure 1 and Figure 2 The active pressure compensator can actively maintain the pressure for the sampler within the range of 6000 meters of ocean depth. The active pressure compensator specifically includes a spring water compensation cylinder 2, a cam pressure compensation pump 1 connected to the spring water compensation cylinder, and a circuit cavity 3 connected to the cam pressure compensation pump.

[0056] The core of the active pressure compensator is the cam pressure compensation pump 1, which is arranged to be able to suck liquid from the spring water compensation cylinder 2 and pump liquid to the circuit cavity 3. The cam pressure compensation pump 1 can normally work under a load condition of 60MPa, and the output flow can compensate for the sample loss flow, and has the advantages of small size, safe and convenient use.

[0057] The spring water compensation cylinder 2 of the active pressure compensator can provide at least 0.5MPa higher than the ambient pressure for the cam pressure compensation pump 1, which is used to compensate for the sample loss flow.

[0058] The circuit cavity 3 of the active pressure compensator houses a pressure sensor and a control circuit board communicatively connected to the pressure sensor. The pressure sensor measures the pressure of the liquid output from the cam-type pressure-compensating pump 1 and the pressure of the mechanism to be pressure-compensated. The control circuit board sends control commands based on the pressure data fed back from the pressure sensor to control the operation of the cam-type pressure-compensating pump 1, thereby achieving active pressure compensation for the mechanism to be pressure-compensated. The circuit cavity 3 also contains a battery that provides power to the pressure sensor and the control circuit board.

[0059] Continue as Figure 1 and Figure 2 As shown, the active pressure compensator also includes an oil bladder 4 connected to the cam pressure pump 1. The cam pressure pump 1 is connected to the oil bladder 4 through a hose to achieve pressure self-adaptation of its internal drive motors 1-18, enabling it to operate under full ocean depth pressure.

[0060] Furthermore, the active pressure compensator also includes a mounting frame 7 for mounting the cam pressure pump 1, the spring water supply cylinder 2, the circuit cavity 3, and the oil bladder 4. The mounting frame 7 has a double-layer structure, in which the cam pressure pump 1 and the circuit cavity 3 are located on the first layer of the mounting frame 7, and the spring water supply cylinder 2 and the oil bladder 4 are located on the second layer of the mounting frame 7. The position of the spring water supply cylinder 2 corresponds to the cam pressure pump 1, and the position of the oil bladder 4 corresponds to the circuit cavity 3.

[0061] It is worth mentioning that the mounting bracket 7 is also equipped with two handles for easy lifting.

[0062] The specific flow path of the liquid in the active pressure compensator is as follows: the spring water supply cylinder 2 provides compensating fluid at a pressure slightly higher than the ambient pressure, which enters the inlet of the cam-type pressure pump 1 through the first pipe 5. After being pressurized, it flows out from the outlet, passes through the second pipe 6, and enters the circuit cavity 3. After the pressure sensor measures the pressure, it flows out from the circuit cavity 3. The circuit cavity 3 is connected to the pressure-repairing mechanism through a high-pressure pipe to provide active pressure compensation for it.

[0063] It is understood that in this embodiment of the present invention, the pressure-repairing mechanism is a sampling cylinder or sampler, or other mechanisms that require pressure compensation. The present invention does not limit the specific application of this active pressure compensator.

[0064] The following will combine Figures 3 to 6 The specific structure of this active pressure compensator is explained.

[0065] Specifically, such as Figure 3 As shown, the cam-assisted pressure pump 1 includes a liquid chamber 1-2 and a liquid inlet valve 1-21 and a liquid outlet valve 1-3 that connect the liquid chamber 1-2. The liquid inlet valve 1-21 and the liquid outlet valve 1-3 are respectively connected to the spring water supply cylinder 2 and the circuit chamber 3.

[0066] Further, the cam booster pump 1 further comprises a plunger 1-5 axially movable along the cam booster pump 1, a rotation-stopping member 1-11 connected to the plunger 1-5, a roller assembly 1-13 connected to the rotation-stopping member 1-11, a cam 1-15 linked to the roller assembly 1-13, and a driving motor 1-18 for driving the cam 1-15 to rotate, wherein when the driving motor 1-18 drives the cam 1-15 to rotate, the cam 1-15 applies an axial pushing force to the roller assembly 1-13, so as to push the plunger 1-5 to move axially towards the liquid cavity 1-2 through the rotation-stopping member 1-11, and then pump the liquid in the liquid cavity 1-2 out through the liquid outlet valve 1-3.

[0067] It is worth mentioning that the liquid inlet valve 1-21 and the liquid outlet valve 1-3 are both one-way valves.

[0068] Further, the plunger 1-5 is sleeved with a first elastic member 1-6, which is used to store elastic potential energy when the plunger 1-5 is pushed to move by the rotation-stopping member 1-11, and is used to release the elastic potential energy when the pushing force of the rotation-stopping member 1-11 to the plunger 1-5 disappears, so that the plunger 1-5, the rotation-stopping member 1-11 and the cam 1-15 return to the original position, wherein when the plunger 1-5, the rotation-stopping member 1-11 and the cam 1-15 return to the original position, the cam booster pump 1 sucks the liquid into the liquid cavity 1-2 through the liquid inlet valve 1-21.

[0069] Further, the cam booster pump 1 comprises a front cavity 1-1, an intermediate cavity 1-14 connected to the front cavity 1-1, a motor cavity 1-16 connected to the intermediate cavity 1-14, and a motor cover 1-19 connected to the motor cavity 1-16, wherein the liquid cavity 1-2, the liquid inlet valve 1-21 and the liquid outlet valve 1-3 are arranged in the front cavity 1-1, the plunger 1-5, the rotation-stopping member 1-11, the roller assembly 1-13, the cam 1-15 and the driving motor 1-18 are arranged in the cavity through the intermediate cavity 1-14 and the motor cavity 1-16, and the plunger 1-5 and the front cavity 1-1 are provided with a shaft combined sealing member 1-4 for sealing the liquid cavity 1-2.

[0070] It is worth mentioning that the front cavity 1-1, the intermediate cavity 1-14, the motor cavity 1-16 and the motor cover 1-19 are connected by bolts 1-8 or screws.

[0071] It is worth mentioning that the cam booster pump 1 further comprises a motor coupling 1-17 for fixing the driving motor 1-18 in the motor cavity 1-16.

[0072] Specifically, the rotation-stopping piece 1-11 has a front end, a middle end and a rear end connected in sequence, the cam compensating pump 1 further comprises a plunger shaft coupling 1-7 and an e-shaped retainer 1-10 for fixedly connecting the plunger 1-5 to the front end of the rotation-stopping piece 1-11, and the cam compensating pump 1 further comprises a roller shaft 1-12 arranged at the rear end of the rotation-stopping piece 1-11, and the roller assembly 1-13 is rotatably arranged on the roller shaft 1-12.

[0073] It is worth mentioning that the cam compensating pump 1 further comprises a plurality of balls 1-9 arranged between the rotation-stopping piece 1-11 and the front cavity 1-1, and the balls 1-9 are used to circumferentially constrain the rotation-stopping piece 1-11 to avoid rotation of the rotation-stopping piece 1-11, that is, the rotation-stopping piece 1-11 is circumferentially constrained by the balls 1-9 in the groove of the front cavity 1-1 and can only move axially along the groove, but cannot rotate. The plunger 1-5 is fixed radially by the front cavity 1-1, the plunger shaft coupling 1-7 and the e-shaped retainer 1-10, and is fixed axially by the plunger shaft coupling 1-7 and the e-shaped retainer 1-10.

[0074] In this preferred embodiment of the present application, the first elastic member 1-6 is a spring, and the two ends of the spring abut against the plunger shaft coupling 1-7 and the inner wall of the front cavity, respectively. When the rotation-stopping piece 1-11 pushes the plunger 1-5 to move axially towards the liquid cavity 1-2, the spring is compressed to store elastic potential energy.

[0075] Further, the cam 1-15 has a linkage end and a driving end extending from the linkage end, and the linkage end and the driving end are connected with the roller assembly 1-13 and the rotating shaft of the driving motor 1-18, respectively. The outer side of the driving end and the inner side wall of the middle cavity 1-14 are further provided with a bearing assembly 1-20.

[0076] It can be understood that the cam 1-15 is mounted on the bearing assembly 1-20 and can rotate around the axis, and the axial force of the cam 1-15 is pressed on the thrust bearing of the bearing assembly 1-20 by the elastic force of the first elastic member 1-6 and the roller assembly 1-13.

[0077] Further, as shown in Figure 4 the motor cover 1-19 is provided with a first interface 1-19-1 for connecting with the oil bag 4, a second interface 1-19-2 for connecting with the circuit cavity 3, and a third interface 1-19-3 for connecting with the motor cavity 1-16, wherein the first interface 1-19-1 and the third interface 1-19-3 are communicated.

[0078] It can be understood that the cam compensating pump 1 is connected with the oil bag 4 through the first interface 1-19-1, and the motor cavity 1-16 is filled with oil through the third interface 1-19-3 to realize pressure self-adaptation of the driving motor 1-18. The cam compensating pump 1 connects the watertight cable to the driving motor 1-18 through the watertight connecting piece in the second interface 1-19-2 to realize control and energy supply of the driving motor 1-18.

[0079] The specific working process of the cam pressure compensation pump 1 is as follows:

[0080] Under the control instruction issued by the control circuit board in the circuit cavity 3, the driving motor 1-18 is driven to work to drive the cam 1-15 to rotate, and the cam 1-15 has two stages in the stroke:

[0081] In the ascending stage of the stroke of the cam 1-15, the cam 1-15 exerts a pushing force on the roller assembly 1-13, and the roller assembly 1-13 pushes the plunger 1-5 to move towards the liquid cavity 1-2 through the rotation-stopping piece 1-11, so that the liquid cavity 1-2 is reduced, the pressure is increased, the purpose of pressurization and pumping out liquid from the liquid outlet valve 1-3 is achieved, and the first elastic member 1-6 is compressed by the rotation-stopping piece 1-11, so that the first elastic member 1-6 stores elastic potential energy;

[0082] In the descending stage of the stroke of the cam 1-15, the pushing force exerted by the cam 1-15 on the roller assembly 1-13 disappears, the first elastic member 1-6 releases the elastic potential energy to provide the plunger 1-5, the rotation-stopping piece 1-11 and the roller assembly 1-13 with a restoring force moving away from the liquid cavity 1-2, the cam 1-15 continues to rotate under the pushing of the roller assembly 1-13, and one cycle is completed, at the same time, the plunger 1-5 moves to the right, the liquid cavity 1-2 is increased, the pressure is reduced, and liquid is sucked from the spring water supplementing cylinder 2 through the liquid inlet valve 1-21.

[0083] It can be understood that the cam pressure compensation pump is used for active pressure compensation, and can be applied to 60MPa small flow control, and has a wider application range.

[0084] It is worth mentioning that the roller assembly 1-13 reduces the sliding friction between itself and the cam 1-15 through its rotation, so that the proportion of rolling friction in the contact form between the two is increased, and the wear of the cam 1-15 is reduced. There is a shaft combined sealing member 1-4 between the plunger 1-5 and the front cavity body 1-1, which realizes the sealing of the liquid cavity 1-2. The entire shell can be divided into four parts: the front cavity body 1-1, the middle cavity body 1-14, the motor cavity 1-16 and the motor cover 1-19, which are connected by bolts 1-8 or screws.

[0085] Further, as shown in Figure 5 The spring water supplementing cylinder 2 includes a water supplementing interface 2-10 and an end cover 2-8 arranged at two ends thereof respectively, a valve core 2-2 for controlling the opening and closing of the water supplementing interface 2-10, a water supplementing cavity 2-11 communicating with the water supplementing interface 2-10, a piston 2-5 arranged at a side of the water supplementing cavity 2-11 away from the valve core 2-2, a second elastic member 2-6 having one end abutting against the piston 2-5 and the other end inserted into the end cover 2-8, and a containing cavity 2-7 for installing the second elastic member 2-6.

[0086] Specifically, the spring water supplementing cylinder 2 has a water supplementing cylinder front end part 2-1 and a water supplementing cylinder rear end part 2-9, wherein the valve core 2-2 and the water supplementing interface 2-10 are arranged at the water supplementing cylinder front end part 2-1, the end cover 2-8 is an open structure and is arranged at the water supplementing cylinder rear end part 2-9; the end cover 2-8 compresses the second elastic member 2-6 in the containing cavity 2-7 and simultaneously provides a guide for the second elastic member 2-6.

[0087] Further, the piston 2-5 is further provided with two guide rings 2-3 and a sealing ring 2-4 arranged between the two guide rings 2-3.

[0088] It is worth mentioning that the water supplementing interface 2-10 of the spring water supplementing cylinder 2 has two functions, one is to connect the water supplementing pump to supplement water in the water supplementing cavity 2-11, and the other is to connect the liquid inlet valve 1-21 of the cam pressure compensating pump 1 to provide compensation liquid for the cam pressure compensating pump 1.

[0089] Specifically, the working process of the spring water supplementing cylinder 2 is as follows:

[0090] The water supplementing interface 2-10 is connected to the water supplementing pump, the valve core 2-2 is opened, and water is filled into the water supplementing cavity 2-11; when the water reaches the rated volume, the valve core 2-2 is closed, the water supplementing pump is removed, and then the water supplementing interface 2-10 is connected to the cam pressure compensating pump 1 through the first pipeline 5, the second elastic member 2-6 exerts pressure on the piston 2-5, and then the pressure is transmitted to the liquid in the water supplementing cavity 2-11. At this time, the pressure of the water in the water supplementing cavity 2-11 is the sum of the pressure of the spring and the ambient pressure, the valve core 2-2 is opened, and at least 0.5 MPa liquid higher than the ambient pressure is provided for the liquid inlet valve 1-21 as compensation liquid, which is beneficial to the cam pressure compensating pump 1 to generate higher pressure.

[0091] The spring water supplementing cylinder 2 of the present application can provide at least 0.5 MPa compensation liquid higher than the ambient pressure for the cam pressure compensating pump 1, and the liquid compensation mode is safer and more convenient than the gas compensation mode.

[0092] Further, as shown in the figure, Figure 6 The circuit cavity 3 includes a shell 3-1, a circuit chamber 3-11 formed in the shell 3-1, and an interface part and a pressure compensating part arranged at two ends of the shell 3-1, respectively.

[0093] Specifically, the interface part is provided with a first connection interface 3-9 for connecting with a water-tight connecting piece to debug and communicate with a control circuit board in the circuit chamber 3-11 and a second connection interface 3-10 for connecting with the cam pressure compensating pump 1.

[0094] It can be understood that the watertight connector connected to the first connection interface 3-9 can debug and communicate with the control circuit board; the watertight connector on the second connection interface 3-10 is connected to the watertight connector in the second interface 1-19-2 through a watertight cable, and can transmit battery energy and instructions of the control circuit board to the driving motor 1-18.

[0095] Specifically, the pressure compensation part includes a pressure compensation inlet 3-6 connected to a liquid outlet valve 1-3 of the cam pressure compensation pump 1, a mounting cavity 3-8 for mounting a pressure sensor, a sensor plug 3-3 for fixing the pressure sensor in the mounting cavity 3-8, a copper column 3-2 connected to the sensor plug 3-3 and located in a circuit cavity 3-11, and a pressure compensation outlet 3-7 communicating the pressure compensation inlet 3-6 and the mounting cavity 3-8.

[0096] It is worth mentioning that the pressure compensation part further includes a circuit cavity end cover 3-5 for sealing the circuit cavity 3-11, and a second sealing ring 3-4 is arranged between the outer side wall of the circuit cavity end cover 3-5 and the shell 3-1, wherein the mounting cavity is formed in the circuit cavity end cover 3-5, and the copper column 3-2 is arranged on the side of the sensor plug 3-3 away from the mounting cavity 3-8.

[0097] Further, the control circuit board of the circuit cavity 3 is mounted on the copper column 3-2, and a battery is further arranged in the circuit cavity 3-11, and the circuit cavity 3 is connected to the pressure compensation mechanism to be compensated through the pressure compensation outlet 3-7.

[0098] The specific working process of the circuit cavity 3 is as follows:

[0099] The pressure sensor measures the pressure of the compensation liquid flowing in through the pressure compensation inlet 3-6 and the pressure of the pressure compensation mechanism connected by the pressure compensation outlet 3-7, and feeds back the pressure data to the control circuit board. If the pressure is lower than the set pressure, the control circuit board sends a control instruction to the driving motor 1-18 of the cam pressure compensation pump 1 to control the driving motor 1-18 to work to realize active pressure compensation.

[0100] It can be understood that the circuit cavity of the present application integrates the functions of control, energy supply, pressure measurement and pressure liquid output, is rich in function, compact in structure, and can realize automatic active pressure compensation control.

[0101] It can also be understood that the present application further provides a pressure compensation method for the active pressure compensator for deep-sea sampling as described above, which includes the following steps:

[0102] The pressure sensor of the circuit cavity 3 detects the pressure of the liquid output by the cam pressure compensation pump 1 and the pressure of the pressure compensation mechanism to be compensated;

[0103] The control circuit board of the circuit cavity 3 receives the pressure data detected by the pressure sensor, and sends a control instruction to the driving motor 1-18 of the cam pressure compensation pump 1 when the pressure is lower than the set pressure.

[0104] The driving motor 1-18 receives the control instruction, pumps out the liquid in the cam pressure compensation pump 1 to the circuit cavity 3, and compensates to the mechanism to be compensated via the pressure compensation outlet 3-7 of the circuit cavity 3, so as to realize active pressure compensation.

[0105] Further, the pressure compensation method of the active pressure compensator for deep-sea sampling further comprises the steps of:

[0106] The water supplement interface 2-10 of the spring water supplement cylinder 2 is connected to the water supplement pump, and the water supplement cavity 2-11 of the spring water supplement cylinder 2 is filled with water through the water supplement pump;

[0107] The water supplement pump is removed, and the water supplement interface 2-10 is connected to the cam pressure compensation pump 1, the second elastic member 2-6 of the spring water supplement cylinder 2 acts on the piston 2-5, and then the pressure is transmitted to the liquid in the water supplement cavity 2-11; the valve core 2-2 is opened, and the cam pressure compensation pump 1 is provided with liquid at least 0.5 MPa higher than the ambient pressure.

[0108] The active pressure compensator for deep-sea sampling of the present application can actively maintain the pressure for the mechanism to be compensated in the range of 6000 meters of the sea depth, has simple and compact overall structure, small volume, high safety, can compensate the pressure for any mechanism needing pressure compensation, and has strong adaptability.

[0109] The technical features of the above embodiments can be combined arbitrarily, and in order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combination of the technical features does not exist contradictory, it should be considered that it is within the scope of the present application.

[0110] The above embodiments only express the preferred embodiments of the present application, the description is more specific and detailed, but it cannot be understood as the limitation of the patent scope of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An active pressure compensator for deep-sea sampling, characterized in that, The spring water supply cylinder, the cam pressure compensation pump connected to the spring water supply cylinder, and the circuit cavity connected to the cam pressure compensation pump are included, wherein The spring water supply cylinder is used to provide liquid for the cam pressure compensation pump, and the liquid is at least 0.5 MPa higher than the ambient pressure. The cam pressure compensation pump is arranged to be able to suck liquid from the spring water supply cylinder and pump the liquid to the circuit cavity. The circuit cavity is used to be connected to the pressure compensation mechanism, and is internally provided with a pressure sensor and a control circuit board communicatively connected to the pressure sensor. The pressure sensor is used to detect the pressure of the liquid output by the cam pressure compensation pump and the pressure compensation mechanism. The control circuit board is used to send control instructions to control the operation of the cam pressure compensation pump based on the pressure data fed back by the pressure sensor, so as to realize active pressure compensation for the pressure compensation mechanism. The spring water supply cylinder includes a water supply interface and an end cover arranged at two ends thereof respectively, a valve core used to control the opening and closing of the water supply interface, a water supply cavity communicating with the water supply interface, a piston arranged on a side of the water supply cavity away from the valve core, a second elastic member having one end abutting against the piston and the other end inserted into the end cover, and a containing cavity used to mount the second elastic member. The cam pressure compensation pump includes a liquid cavity, a liquid inlet valve, and a liquid outlet valve communicating with the liquid cavity. The liquid inlet valve and the liquid outlet valve are respectively connected to the spring water supply cylinder and the circuit cavity. The cam pressure compensation pump further includes a plunger capable of moving axially along the cam pressure compensation pump, a rotation-stopping member connected to the plunger, a roller assembly connected to the rotation-stopping member, a cam linked to the roller assembly, and a driving motor used to drive the cam to rotate. When the driving motor drives the cam to rotate, the cam applies an axial pushing force to the roller assembly, so that the roller assembly pushes the plunger to move axially in a direction close to the liquid cavity through the rotation-stopping member, and then pumps the liquid in the liquid cavity out through the liquid outlet valve.

2. The active pressure compensator for deep-sea sampling according to claim 1, characterized in that, The liquid inlet valve and the liquid outlet valve are both one-way valves.

3. The active pressure compensator for deep-sea sampling of claim 1, wherein, The plunger is sleeved with a first elastic member. The first elastic member is used to store elastic potential energy when the plunger is pushed to move by the rotation-stopping member, and is used to release the elastic potential energy when the pushing force of the rotation-stopping member to the plunger disappears, so that the plunger, the rotation-stopping member, and the cam return to the original position. When the plunger, the rotation-stopping member, and the cam return to the original position, the cam pressure compensation pump sucks liquid into the liquid cavity through the liquid inlet valve.

4. The active pressure compensator for deep-sea sampling according to claim 3, characterized in that, The cam pressure compensation pump includes a front cavity, an intermediate cavity connected to the front cavity, a motor cavity connected to the intermediate cavity, and a motor cover connected to the motor cavity. The liquid cavity, the liquid inlet valve, and the liquid outlet valve are arranged in the front cavity. The plunger, the rotation-stopping member, the roller assembly, the cam, and the driving motor are arranged in a cavity passing through the intermediate cavity and the motor cavity. An axial combined sealing member is arranged between the plunger and the front cavity to seal the liquid cavity.

5. The active pressure compensator for deep-sea sampling according to claim 4, characterized in that, The front cavity, the middle cavity, the motor cavity and the motor cover are connected by bolts or screws.

6. The active pressure compensator for deep-sea sampling of claim 4, wherein, The cam pressure compensation pump further comprises a motor shaft coupling for fixing the driving motor in the motor cavity.

7. The active pressure compensator for deep-sea sampling of claim 4, wherein, The cam pressure compensation pump further comprises a ball arranged between the rotation-stopping member and the front cavity, the ball being used for circumferentially restricting the rotation-stopping member to avoid rotation of the rotation-stopping member, the rotation-stopping member having a front end, a middle end and a rear end connected in sequence, the cam pressure compensation pump further comprising a plunger shaft coupling and an e-shaped check ring for fixedly connecting the plunger to the front end of the rotation-stopping member, and a roller shaft arranged at the rear end of the rotation-stopping member, the roller assembly being rotatably arranged on the roller shaft.

8. The active pressure compensator for deep-sea sampling according to claim 7, characterized in that, The cam has a linkage end and a driving end extending from the linkage end, the linkage end and the driving end being connected with the roller assembly and the rotating shaft of the driving motor respectively, and a bearing assembly being further arranged between the outer side of the driving end and the inner side wall of the middle cavity.

9. The active pressure compensator for deep-sea sampling of claim 4, wherein, The motor cover is provided with a first interface for connecting with an oil bag, a second interface for connecting with the circuit cavity and a third interface for connecting with the motor cavity, wherein the first interface and the third interface are communicated.

10. The active pressure compensator for deep-sea sampling according to claim 9, characterized in that, The piston is provided with two guide rings and a sealing ring arranged between the two guide rings.

11. The active pressure compensator for deep-sea sampling of claim 9, wherein, The circuit cavity comprises a shell, a circuit chamber formed in the shell, and an interface part and a pressure compensation part arranged at two ends of the shell respectively, wherein the interface part is provided with a first connecting interface for connecting with a water-tight connector to debug and communicate with the control circuit board in the circuit chamber and a second connecting interface for connecting with the cam pressure compensation pump; the pressure compensation part comprises a pressure compensation inlet connected with the liquid outlet valve of the cam pressure compensation pump, a mounting cavity for mounting the pressure sensor, a sensor plug for fixing the pressure sensor in the mounting cavity, a copper column connected with the sensor plug and located in the circuit chamber, and a pressure compensation outlet communicating the pressure compensation inlet and the mounting cavity; the control circuit board is mounted on the copper column, and a battery is further arranged in the circuit chamber, and the circuit cavity is connected with the pressure compensation mechanism through the pressure compensation outlet.

12. The active pressure compensator for deep-sea sampling according to any one of claims 1 to 9, characterized in that, The pressure compensation mechanism is a sampling cylinder.

13. The active pressure compensator for deep-sea sampling according to any one of claims 1 to 9, characterized in that, The active pressure compensator further comprises an oil bag connected with the cam pressure compensation pump, and further comprises a mounting frame for mounting the cam pressure compensation pump, the spring water compensation cylinder, the circuit cavity and the oil bag, the mounting frame being a double-layer structure, wherein the cam pressure compensation pump and the circuit cavity are arranged at a first layer of the mounting frame, the spring water compensation cylinder and the oil bag are arranged at a second layer of the mounting frame, and the position of the spring water compensation cylinder corresponds to the cam pressure compensation pump, and the position of the oil bag corresponds to the circuit cavity.

14. A method of pressure compensation for an active pressure compensator for deep-sea sampling according to claim 11, characterized in that, The method comprises the steps of: The pressure sensor of the circuit cavity detects the pressure of the liquid output by the cam pressure compensation pump and the pressure compensation mechanism; The control circuit board of the circuit cavity receives the pressure data detected by the pressure sensor, and sends a control instruction to the driving motor of the cam pressure compensation pump when the pressure is lower than a set pressure; The driving motor receives the control instruction and pumps the liquid in the cam pressure compensation pump to the circuit cavity, and compensates the pressure to the mechanism to be compensated through the pressure compensation outlet of the circuit cavity, so as to realize active pressure compensation.

15. The method of pressure compensation for an active pressure compensator for deep-sea sampling according to claim 14, wherein, Further comprising steps of: Connecting the water compensation interface of the spring water compensation cylinder to the water compensation pump, and filling the water compensation cavity of the spring water compensation cylinder through the water compensation pump; Removing the water compensation pump and connecting the water compensation interface to the cam pressure compensation pump, the second elastic member of the spring water compensation cylinder presses on the piston, and then transmits the pressure to the liquid in the water compensation cavity; opening the valve core to provide the cam pressure compensation pump with liquid at least 0.5 MPa higher than the ambient pressure.

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