WO2021103044A1

WO2021103044A1 - Active pressure compensation structure of corer provided with electric motor for boosting pressure, and method

Info

Publication number: WO2021103044A1
Application number: PCT/CN2019/122342
Authority: WO
Inventors: 高明忠; 谢和平; 陈领; 张志龙; 李聪; 吴年汉; 李佳南; 何志强; 杨明庆; 余波; 胡云起; 黄伟
Original assignee: 深圳大学
Priority date: 2019-11-26
Filing date: 2019-12-02
Publication date: 2021-06-03
Also published as: CN110748312A; CN110748312B

Abstract

Disclosed are an active pressure compensation structure of a corer provided with an electric motor for boosting the pressure, and a method. The structure comprises a pressure compartment (1), a plunger pump, an electric motor (3) and a transmission mechanism, wherein a cylinder body (22) of the plunger pump is in communication with the interior of the pressure compartment (1); the transmission mechanism is used for converting the rotary motion of the electric motor (3) into the relative linear motion of a plunger (21) and the cylinder body (22); the transmission mechanism is a lead screw transmission sliding table (4); a lead screw (41) of the lead screw transmission sliding table (4) is connected to the electric motor (3); a sliding block (42) of the lead screw transmission sliding table (4) is connected to the cylinder body (22) of the plunger pump; and the plunger (21) of the plunger pump is connected to a base (43). The structure and the method can carry out active pressure compensation on the pressure compartment, can realize feedback adjustment, can facilitate the guaranteeing of the pressure-maintaining effect, and are of great significance for deep-sea sediment pressure-maintained coring.

Description

Active pressure compensation structure and method for core remover with motor supercharging

Technical field

The invention relates to the technical field of pressure maintaining and core removal, and in particular to an active pressure compensation structure and method for a core removal device with motor supercharging.

Background technique

After the subsea drilling rig obtains the samples in the deep sea, the fidelity cabin pressure holding control device is required to hold and seal the samples in the in-situ environment. In the process of pressure-maintaining and coring of deep-sea sediments, due to imperfect sealing methods, inaccurate assembly, and changes in the pressure difference between the inside and outside of the drilling rig, it is inevitable that the fidelity cabin will leak. At this time, pressure compensation is particularly important. However, the current pressure compensation only uses an accumulator (air-cushion type, spring type, etc.) for semi-active pressure retention, and the pressure retention effect cannot be guaranteed.

Summary of the invention

The present invention aims to provide an active pressure compensation structure and method for a coring device with motor supercharging, which can actively pressure a pressure chamber, and is of great significance for pressure keeping and coring of deep-sea sediments.

In order to achieve the above objectives, the technical solutions adopted by the present invention are as follows:

An active pressure compensation structure for a core remover with a motor booster, comprising a pressure chamber, a plunger pump, a motor, and a transmission mechanism. The cylinder of the plunger pump communicates with the inside of the pressure chamber, and the transmission mechanism is used to The rotational movement of the motor is transformed into the relative linear movement of the plunger and the cylinder.

Further, the transmission mechanism is a lead screw drive slide, the lead screw of the lead screw drive slide is connected to the motor, the slide block of the lead screw drive slide is connected to the cylinder of the plunger pump, and the plunger of the plunger pump is connected to the cylinder of the plunger pump. Dock connection.

Wherein, the pressure chamber includes a cylinder, an upper sealing device for sealing the upper end of the cylinder, and a lower sealing device for sealing the lower end of the cylinder.

Further, the upper end sealing device includes an upper end plug which is threadedly connected with the cylinder body, and a medium channel communicating with the inside of the cylinder body is reserved on the upper end plug. The outlet of the plunger pump is communicated with the medium channel.

Further, a sealing ring and a retaining ring are used to form a seal between the upper end plug and the inner wall of the cylinder.

Further, the lower end sealing device includes a lower end plug, and the lower end plug is threadedly connected with the cylinder.

Further, a sealing ring and a retaining ring are used to form a seal between the lower end plug and the inner wall of the cylinder.

Alternatively, the lower end sealing device includes a flap valve, the flap valve includes a valve seat and a valve flap, and the valve flap and the valve seat are sealingly matched.

Further, the flap valve is fixed in the cylinder by a spring, a mounting ring and an external threaded part; the bottom surface of the valve seat abuts against the external threaded part, and the external threaded part is threadedly connected with the inner wall of the cylinder;

The spring is compressed between the valve flap and the mounting ring, the inner wall of the cylinder has an inner step for resisting the mounting ring, the upper end of the spring is pressed against the mounting ring so that the mounting ring is pressed against the inner step, and the lower end of the spring is pressed against the inner step. The valve flap is provided with an initial sealing pressure on the valve flap, and a sealing ring is arranged between the valve seat and the cylinder body.

Further, a pressure sensor is installed in the pressure chamber.

Using the above method of active pressure compensation of the active pressure compensation structure of the core remover, when it is detected that the pressure in the pressure chamber is lower than the preset pressure, the motor operates to reduce the sealing working cavity of the pressure chamber to achieve pressure increase.

Compared with the prior art, the present invention has the following beneficial effects:

1. The present invention can actively compensate the pressure of the pressure chamber, can realize feedback adjustment, is beneficial to ensure the pressure-holding effect, and is of great significance for the pressure-keeping and coring of deep-sea sediments;

2. The present invention can also be used to test the sealing performance and deformation of different flap valves, and verify the pressure holding capacity of flap valves of different structures and shapes.

Description of the drawings

Figure 1 is a schematic diagram of the structure of the utility model;

Figure 2 is a schematic diagram of the structure of the pressure chamber in the first embodiment;

Figure 3 is a schematic diagram of the flap valve in the first embodiment when installed in a pressure chamber;

Figure 4 is a schematic diagram of the pressure chamber in a horizontal position;

Figure 5 is a schematic diagram of the pressure chamber in a vertical position;

Fig. 6 is a schematic diagram of the structure of the pressure chamber in the second embodiment.

Detailed ways

In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings.

Example one

As shown in Figures 1 and 2, the active pressure compensation structure of the core remover with motor pressurization disclosed in this embodiment includes a pressure chamber 1, a plunger pump, a motor 3, and a transmission mechanism. The cylinder 22 of the plunger pump and The pressure chamber 1 is internally communicated, and the transmission mechanism is used to convert the rotary motion of the motor 3 into the relative linear motion of the plunger 21 and the cylinder 22. The relative movement of the plunger 21 and the cylinder 22 reduces the effective volume of the cylinder 22, thereby reducing the volume of the sealed working chamber of the pressure chamber 1 to achieve pressurization, with high rated pressure, compact structure, and high efficiency. .

In this embodiment, the transmission mechanism is a lead screw drive slide 4, the lead screw 41 of the lead screw drive slide 4 is connected to the motor 3, the slide 42 of the lead screw drive slide 4 is connected to the cylinder 22 of the plunger pump, and the column The plunger 21 of the plug pump is connected with the base 43, and the cylinder 22 is driven to move linearly through the rotation of the motor 3.

In another embodiment, the slider 42 can also be connected to the plunger 21 to drive the plunger 21 to move linearly.

The invention can actively compensate the pressure of the pressure chamber, can realize feedback adjustment, is beneficial to guarantee the pressure-holding effect, and is of great significance for the pressure-maintaining and coring of deep-sea sediments.

The motor pressurization method of the present invention can be applied to a test platform for the pressure holding characteristics of the pressure holding chamber of a core remover to provide a high pressure environment for the test chamber. Specifically, the pressure chamber 1 includes a cylinder body 11, an upper end sealing device for sealing the upper end of the cylinder body 11 and a lower end sealing device for sealing the lower end of the cylinder body 11.

As shown in Figure 2, the upper end sealing device includes an upper end plug 12, and the lower end seal device includes a lower end plug 13. Both the upper end plug 12 and the lower end plug 13 are threadedly connected to the cylinder 11, and the upper end plug 12 is reserved for communication The medium channel 15 inside the cylinder 11 connects the outlet of the plunger pump with the medium channel 15.

The lower end sealing device includes a lower end plug 13, and the lower end plug 13 is threadedly connected with the cylinder 11. The upper end plug 12 and the lower end plug 13 and the inner wall of the cylinder 11 are all sealed with a sealing ring 14 and a retaining ring. The sealing ring 14 adopts a polyurethane sealing ring, which can withstand high temperature and high pressure.

The pressure chamber 1 is maintained at high pressure through the pressurization of the motor, which is beneficial to test the pressure resistance characteristics of the pressure chamber 1, and to understand its deformation characteristics under different working conditions, which can verify the feasibility and scientificity of the design scheme, and facilitate the structural, The material improvement of the fidelity cabin can provide test basis and data support for the research and development and design of fidelity core drilling rigs.

As shown in Figure 3, the present invention is used to test the strain of the internal parts of the pressure holding chamber. Take the test of the flap valve in the core remover as an example. The flap valve includes a valve seat 51 and a valve flap 52, and the valve flap 52 and the valve seat 51 are hermetically matched.

In this embodiment, the flap valve is fixed in the cylinder 11 by the spring 6 and the mounting ring 7; the outer end of the valve seat 51 abuts against the lower end plug 13. The spring 6 is compressed between the valve flap 52 and the mounting ring 7. The inner wall of the cylinder 11 has an inner step 16 for resisting the mounting ring 7. The upper end of the spring 6 rests on the mounting ring 7 so that the mounting ring 7 abuts on the inner step 16. , The lower end of the spring 6 rests on the valve flap 52 to provide the valve flap 52 with an initial sealing pressure, and a sealing ring is provided between the valve seat 51 and the cylinder 11.

As shown in Figures 4 and 5, the pressure chamber 1 can be installed on the rotating mechanism 8 during the test, so that the pressure chamber 1 can be rotated as a whole and fixed at 90° and 180°, so that the pressure chamber 1 can be in a horizontal position And the vertical position to start related test work. The rotating mechanism 8 includes a bracket 81, a workpiece fixing seat 83, a bearing seat 82, and a horizontal limit plate 84. The pressure chamber 1 is fixed on the workpiece fixing seat 83. The workpiece fixing seat 83 is provided with two horizontal shafts 85, the horizontal shaft 85 and The axis of the pressure chamber 1 is vertical.

The two horizontal shafts 85 are supported on the bearing seat 82 through bearings. The bearing seat 82 is fixedly connected to the bracket 81. The horizontal limit plate 84 stands upright and is fixed to the bracket 81. The horizontal limit plate 84 is connected to the pressure chamber 1 A limit gap with matching shapes, the limit gap opens above the horizontal limit plate 84. The horizontal limit plate 84 is provided with a horizontal pin 87, and the workpiece fixing seat 83 is provided with a pin hole 88 adapted to the horizontal pin 87, and the pin hole 88 is perpendicular to the horizontal axis 85.

As shown in Figure 4, when the pressure chamber 1 is placed horizontally, one end of the pressure chamber 1 is located in the limit gap of the horizontal limit plate 84, and the limit gap is blocked by the bead 86, thereby fixing the pressure chamber 1 in the horizontal position. The bead 86 is connected with the horizontal limit plate 84 by screws. At this time, the pin hole 88 is parallel to the vertical plane.

When it is necessary to adjust the pressure chamber 1 to the vertical position, loosen the screws, remove the bead 86, and turn the pressure chamber 1 to the vertical position. As shown in Figure 5, at this time, the pin hole 88 is parallel to the horizontal plane and is directly opposite to the horizontal pin 87 on the horizontal limit plate 84, and then the horizontal pin 87 on the horizontal limit plate 84 is inserted into the pin hole 88, Thus, the pressure chamber 1 is fixed in a vertical position.

A pressure sensor 10 is installed in the pressure chamber 1. Using the method of active pressure compensation of the active pressure compensation structure of the core remover, when it is detected that the pressure in the pressure chamber 1 is lower than the preset pressure, the motor 3 operates to reduce the sealing working volume of the pressure chamber 1 to achieve pressure compensation.

The invention compensates the pressure inside the pressure chamber, which can maintain a high pressure environment in the pressure chamber 1, which is convenient for testing the high pressure condition of the pressure chamber 1, and can also test the pressure resistance characteristics of internal components.

The installation and fixation of the valve plate valve is convenient and fast, and it is convenient to replace the flap valve of different structure and shape, and it is convenient to verify the pressure resistance of the flap valve of different structure and shape. The sealing performance can be tested by adding a fluorescent agent to the liquid medium that passes into the cabin and using a fluorometer to detect the leakage path; it can also be tested by installing multiple acoustic emission sensors and using an acoustic detector to detect valve leakage; The amount of deformation can be monitored by installing strain gauges. Deformation can be monitored by pasting strain gauges.

Example two

The difference between this embodiment and the first embodiment is that: as shown in FIG. 6, the lower end sealing device in this embodiment includes a flap valve. The flap valve is fixed in the cylinder 11 through the spring 6, the mounting ring 7 and the external thread part 17; the bottom surface of the valve seat 51 abuts the external thread part 17, and the external thread part 17 is threadedly connected with the inner wall of the cylinder body 11.

The spring 6 is compressed between the valve flap 52 and the mounting ring 7. The inner wall of the cylinder 11 has an inner step 16 for resisting the mounting ring 7. The upper end of the spring 6 rests on the mounting ring 7 so that the mounting ring 7 abuts on the inner step 16. , The lower end of the spring 6 rests on the valve flap 52 to provide the valve flap 52 with an initial sealing pressure, and a sealing ring is provided between the valve seat 51 and the cylinder 11.

The external threaded component 17 is hollow, and the outer surface of the valve flap 52 can be scanned by a 3D laser using a 3D laser sensor to measure the three-dimensional strain of the outer surface of the valve flap 52.

Of course, the present invention can also have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding changes And the deformation should belong to the protection scope of the appended claims of the present invention.

Claims

An active pressure compensation structure for a core remover with a motor pressurization, which is characterized in that it comprises a pressure chamber, a plunger pump, a motor, and a transmission mechanism. The cylinder of the plunger pump communicates with the inside of the pressure chamber. The mechanism is used to convert the rotary motion of the motor into the relative linear motion of the plunger and the cylinder.
The active pressure compensation structure of the core remover according to claim 1, wherein the transmission mechanism is a lead screw transmission sliding table, the lead screw of the lead screw transmission sliding table is connected with the motor, and the slide of the lead screw transmission sliding table is connected to the motor. It is connected with the cylinder of the plunger pump, and the plunger of the plunger pump is connected with the base.
The active pressure compensation structure of the core remover according to claim 1, wherein the pressure chamber includes a cylinder, an upper sealing device for sealing the upper end of the cylinder, and a lower sealing device for sealing the lower end of the cylinder.
The active pressure compensation structure of the core remover according to claim 3, characterized in that: the upper end sealing device includes an upper end plug, the upper end plug is threadedly connected to the cylinder, and the upper end plug is reserved for communicating with the inside of the cylinder. Media channel, the outlet of the plunger pump is communicated with the media channel.
The active pressure compensation structure of the core remover according to claim 4, wherein the lower end sealing device comprises a lower end plug, and the lower end plug is threadedly connected with the cylinder.
The active pressure compensation structure of the core remover according to claim 5, characterized in that: the lower end plug and the upper end plug and the inner wall of the cylinder are all sealed with a sealing ring and a retaining ring.
The active pressure compensation structure of the core remover according to claim 3 or 4, characterized in that: the lower end sealing device includes a flap valve, the flap valve includes a valve seat and a valve flap, and the valve flap and the valve seat are in sealing cooperation .
The active pressure compensation structure of the core remover according to claim 7, characterized in that: the flap valve is fixed in the cylinder by a spring, a mounting ring and an external thread component; the bottom surface of the valve seat abuts against the external thread component, and The threaded part is threadedly connected with the inner wall of the cylinder;

The spring is compressed between the valve flap and the mounting ring, the inner wall of the cylinder has an inner step for resisting the mounting ring, the upper end of the spring is pressed against the mounting ring so that the mounting ring is pressed against the inner step, and the lower end of the spring is pressed against the inner step. The valve flap is provided with an initial sealing pressure on the valve flap, and a sealing ring is arranged between the valve seat and the cylinder body.
The active pressure compensation structure of the core remover according to claim 1, 2, 3, 4, 5, 6 or 8, wherein a pressure sensor is installed in the pressure chamber.
The method of using the active pressure compensation structure of the core remover according to any one of claims 1-9, characterized in that: when it is detected that the pressure in the pressure chamber is lower than the preset pressure, the motor operates to make the pressure chamber The sealed working cavity is reduced to achieve pressurization.