Multi-channel pinch valve for deep sea sampling

Abstract

The invention discloses a multi-channel pinch valve for deep sea sampling. The multi-channel pinch valve comprises a valve body with a built-in cavity and a driving device, the valve body is provided with a cavity, the valve body is annularly provided with a plurality of mounting channels allowing the flexible hoses to penetrate through with the cavity as the center and a radial channel used for communicating the cavity with the mounting channels, a valve body assembly used for extruding the flexible hoses is arranged in the radial channel, and the mounting channels do not pass through the cavity; a self-rotating wheel is arranged in the cavity, and a groove is formed in the circumferential surface of the self-rotating wheel; the valve body assembly comprises a pipe clamping push head used for extruding the flexible hose and a reset spring, the reset spring is fixed to the end, close to the cavity, of the pipe clamping push head, a spring sleeve is arranged at the other end of the reset spring, and the outer side of the spring sleeve is in sliding contact with the circumferential face of the self-rotating wheel. A limiting sliding groove is formed in the inner wall of the radial channel in the axial direction, and the pipe clamping push head is provided with a limiting block in sliding fit with the limiting sliding groove. The device provided by the invention is suitable for deep sea environment sampling.

Description

Technical Field

[0001] The invention belongs to the field of underwater operation equipment, and in particular relates to a multi-channel pinch valve for deep sea sampling Background Art

[0002] The study of deep seawater is of great significance to the study of marine chemistry, biology and climate science. Sample analysis is the basis and the most effective method of deep sea research. Deep sea sampling is essential for deep sea research. In the process of deep sea sampling, the load capacity of the sampler's loading device is limited, and the diving cost of the loading device is high. It is extremely important to complete as many sampling tasks as possible under a certain load in a single dive. In the stratified sampling of deep sea suspended matter, the load capacity of the vertical profile sampler is limited. In order to obtain as many suspended matter samples as possible at multiple sea depths, a pump is required to pump seawater through different filter discs at different sea depths. Therefore, a reversing valve is required to control the conduction of different pipelines at different sea depths. The pinch valve has a simple structure and is easy to install. The pipeline using the pinch valve does not come into direct contact with metal, which can avoid metal contamination of the sampled sample. The pinch valve has a large pipeline diameter and is suitable for fluid control of large volume sampling. And after the pinch valve is turned on, the valve has little effect on the flow of pipeline fluid, and the energy loss generated is small. The energy of the sampler for deep sea sampling comes from the battery. Due to the size and buoyancy of the dry tank, the battery capacity is limited. Smaller energy loss means longer sampling time for the sampler. Therefore, this feature of the pinch valve is particularly important for deep sea sampling.

[0003] The current pinch valves are all single-pass pinch valves and cannot be used in the high-pressure environment of the deep sea. In order to ensure the purity of the sampled samples, the pinch valve can only be switched between two states: one-way conduction and all-closed.

[0004] For example, patent document CN116857400A proposes a clamp valve with a multi-line switching function. The valve uses a motor to drive a triangular valve wheel, which has two arc-shaped protrusions. It can push two valve needles of the valve components evenly distributed around the triangular valve wheel onto the corresponding hoses, so that two of the three-way hoses are closed and one is open. Since the cam of the clamp valve is a triangular cam with two protrusions, there is a three-way open state, and since it is driven by a motor, it cannot be directly used in deep-sea environments.

[0005] Patent document CN117781009A proposes a synchronously adjustable multi-channel pinch valve and a multi-way synchronous adjustment method. The valve uses the change of the rotation angle of a cylindrical cam valve head with multiple grooves distributed in different circumferential axes to achieve the squeeze closure and conduction of the hose. The pinch valve is driven by a motor, which is directly exposed to the outside world and cannot be used in deep sea environments. When the hose radius is large and the full hose closed state is inserted between two adjacent hose conduction states, the radius and height of the cylindrical cam will be greatly increased. Summary of the invention

[0006] The purpose of the present invention is to provide a multi-channel pinch valve for deep-sea sampling, which only requires a single motor drive to achieve deep-sea sampling tasks under multiple channels. It has a simple structure and low energy consumption to meet the needs of long-term multi-channel sampling in the deep sea.

[0007] In order to achieve the purpose of the present invention, the following technical solution is provided: a multi-channel pinch valve for deep-sea sampling, comprising a valve body with a built-in cavity and a driving device; The valve body is provided with a plurality of installation channels for the flexible hose to pass through around the cavity as the center, and a radial channel for connecting the cavity and the installation channel, wherein a valve body assembly for squeezing the flexible hose is arranged in the radial channel, and the installation channel does not pass through the cavity; A self-rotating wheel is arranged in the cavity, and a groove is arranged on the circumference of the self-rotating wheel; The valve body assembly comprises a clamping tube push head for squeezing a flexible hose and a return spring, wherein the return spring is fixed to one end of the clamping tube push head close to the cavity, and the other end of the return spring is provided with a spring sleeve, the outer side of the spring sleeve is in sliding contact with the circumference of the rotating wheel, the inner wall of the radial channel is axially provided with a limiting slide groove, and the clamping tube push head is provided with a limiting block that is slidably matched with the limiting slide groove; The driving device is used to provide driving force for the self-rotating wheel.

[0008] The present invention provides a plurality of installation channels for the flexible hose to pass through in the non-cavity area of ​​the valve body, and provides a radial channel connected to the cavity for each installation channel, and a valve body assembly that works by utilizing the spring restoring force is provided in the radial channel, and the valve body assembly is provided with a tube clamping push head, a return spring and a spring sleeve in sequence axially toward one end of the cavity near one end of the installation channel, and at the same time, the linear movement of the tube clamping push head is restricted by the axial limiting slide groove of the radial channel, and finally, a rotating wheel with grooves in the cavity of the valve body cooperates with the spring sleeves in each radial channel, so that the radial channel corresponding to the groove releases the spring compression force, so that the tube clamping push head retracts into the radial channel to release the flexible hose that is squeezed and cut off, and the valve body assembly corresponding to other non-groove areas of the rotating wheel squeezes the return spring inwardly through the spring sleeve, and the return spring transmits the squeezing force to the tube clamping push head at the other end, so that the flexible hose in the installation channel is squeezed to cut off the flow.

[0009] Specifically, the shape of the groove is constructed using a speed curve.

[0010] Specifically, the shape of the groove adopts a constant velocity curve to avoid interference between the spring sleeve and the rotating wheel.

[0011] Specifically, the spring sleeve is provided with a ceramic ball that matches the shape of the groove, which converts sliding friction into rolling friction, reduces friction and friction loss, and further reduces the torque required for the motor to rotate the cam, thereby increasing the service life of the valve.

[0012] Specifically, the inner wall of the installation channel is provided with a plug that cooperates with the tube clamping push head to clamp the flexible hose, thereby more effectively squeezing the flexible hose to cut off the flow.

[0013] Specifically, the driving device includes an outer shell and a step-up motor arranged in the outer shell, and the step-up motor is connected to the rotation center of the rotating wheel through a coupling.

[0014] Specifically, the outer shell is filled with oil to adapt to the high-pressure environment of the deep sea.

[0015] Specifically, a potentiometer is further provided at the output end of the driving device, and the current orientation angle of the groove is judged based on the resistance value displayed by the potentiometer, thereby achieving quantitative control.

[0016] Specifically, the installation channel is arranged parallel to the rotation axis of the rotating wheel in the cavity, so as to facilitate the wiring of the flexible hose.

[0017] Specifically, the tube clamp push head is used to extrude the flexible hose and is in the shape of an ear. The axis of the central circular hole of the ear is parallel to the axis of the installation channel. The position of the tube clamp push head is adjusted by the ear to facilitate the arrangement of the flexible hose through the installation channel.

[0018] Compared with the prior art, the present invention has the following beneficial effects: A self-rotating wheel with a groove is arranged in the valve body, and the structure between the spring and the groove is matched to realize a single motor controlling the sampling state of multiple sampling hoses; The device has a simple overall structure and low energy consumption, and can meet the needs of long-term multi-channel sampling in the deep sea. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the structure of the multi-channel pinch valve provided in this embodiment; Figure 2 A cross-sectional view of the multi-channel pinch valve provided in this embodiment; Figure 3 A schematic diagram of the operation of the multi-channel pinch valve provided in this embodiment; Figure 4 A radial cross-sectional view of the self-rotating wheel provided in this embodiment; Figure 5 A schematic diagram of the structure of the pipe clamping pusher provided in this embodiment; Among them, 1. valve body; 2. spring sleeve; 3. ceramic ball; 4. first O-ring; 5. self-rotating wheel; 6. elastic retaining ring; 7. reset spring; 8. tube clamp push head; 9. plug; 10. second O-ring; 11. sleeve; 12. deep groove ball bearing; 13. aluminum column; 14. set screw; 15. potentiometer; 16. D-shaped shaft; 17. coupling; 18. motor fixing sleeve; 19. stepper motor; 20. sleeve end cover; 21. flexible hose; 22. installation channel; 23. radial channel; 24. drive device. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0021] like Figure 1 and 2 , which is a schematic diagram of a multi-channel pinch valve provided in this embodiment, comprising a valve body 1 with a built-in cavity and a driving device 24; The valve body 1 is provided with a plurality of installation channels 22 for the flexible hose 21 to pass through, and a radial channel 23 for connecting the cavity and the installation channel 22. The radial channel 23 is provided with a valve body assembly for squeezing the flexible hose 21. All the installation channels 22 do not pass through the cavity.

[0022] The cavity is provided with a self-rotating wheel 5, and the circumference of the self-rotating wheel 5 is provided with a groove, such as Figure 3 and Figure 4 As shown, in this embodiment, an inner groove is dug out within an angle of 60°, so that there is an intermediate state in the state transition of the six valve body assemblies from one valve component open and the other valve components closed to another valve component open and the other valve components closed, that is, all valve components are closed.

[0023] The shape of the groove can be designed according to the desired speed curve. Here it is designed as a constant speed curve, that is, two sections of convex arcs. When the center line of the groove of the rotation 5 is aligned with a valve member, the reset spring 7 is relaxed, and the radial outward thrust on the clamping tube push head 8 is reduced. The clamping tube push head 8 is pushed radially inward by the restoring force of the flexible hose 21 itself, and the flexible hose 21 is opened.

[0024] The valve body assembly includes a tube clamping push head 8 and a return spring 7 for squeezing the flexible hose 21. The return spring 7 is fixed to one end of the tube clamping push head 8 close to the cavity. The other end of the return spring 7 is provided with a spring sleeve 2. The outer side of the spring sleeve 2 is provided with a ceramic ball 3 adapted to the shape of the groove to realize the transformation of sliding friction into rolling friction, reduce friction and friction loss, and thereby reduce the torque required for the motor to rotate the cam and increase the service life of the valve. The inner wall of the radial channel 23 is provided with a limit groove along the axial direction, and the tube clamping push head 8 is provided with a limit block that slides with the limit groove.

[0025] The driving device 24 is used to provide driving force for the self-rotating wheel. In this embodiment, the lower end of the self-rotating wheel 5 is matched with a deep groove ball bearing 12, and the axial movement of the self-rotating wheel 5 and one side of the deep groove ball bearing 12 is fixed by a shaft shoulder.

[0026] The deep groove ball bearing 12 is fixed on the valve body 1 through the hub shoulder of the valve body 1 and the elastic retaining ring 6. There is a D-shaped hole at the end of the rotating wheel 5, in which the D-shaped shaft 16 is inserted and fixed by the set screw 14.

[0027] The D-shaped shaft 16 is provided with a potentiometer 15, and the current angle of the cam 5 is obtained by calculating the resistance value of the potentiometer 15. The potentiometer is fixed to the valve body 1 through the aluminum column 13. The other end of the D-shaped shaft 16 is connected to the stepper motor 19 through the coupling 17, and the stepper motor 19 is fixed to the valve body 1 through the motor fixing sleeve 18. The stepper motor 19 and the potentiometer 15 are placed in a closed space formed by the valve body 1, the sleeve 11 and the sleeve end cover 20, and are sealed by O-rings 10 and 4. Hydraulic oil is filled in the closed space, and the deep sea pressure is transmitted through the hydraulic oil, while separating the sea water from the internal electronic devices.

[0028] For the potentiometer 15, this embodiment provides the following control method: Add 3.3V voltage to both ends of the potentiometer, connect the output end of the potentiometer to the ADC interface of the microcontroller, and the microcontroller reads the voltage value of the ADC interface. First calibrate the voltage value of the potentiometer when the valve is fully open or fully closed. Write a position PID program, and the input is the current voltage value and the target position voltage value.

[0029] like Figure 5 As shown, it is a schematic diagram of the tube clamp push head 8 provided in this embodiment. A reset spring 7 is added between the spring sleeve 2 and the tube clamp push head 8, and the clamping force of the tube clamp push head 8 can be adjusted by adjusting the stiffness of the reset spring 7. At the same time, due to the presence of the reset spring 7, the tube clamp push head 8 is always close to the flexible hose 21 for different pipe diameters. When the valve member is in a closed state, the thickness of the flexible hose 21 after closing is different for different pipe diameters. Compared with the general rigid connection (that is, the rotating wheel 5 is directly rigidly connected to the tube clamp push head 8), adding a reset spring 7 between the two can make the flexible hoses 21 of different radii completely closed. At the same time, a dial ear is provided on the tube clamp push head 8, which can be radially dialed inward to facilitate the installation of the hose 21.

[0030] In addition, the terms "upper", "lower", "inner", "outer", "front", "rear" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. Unless otherwise specifically stated, the relative steps, numerical expressions and values ​​of the components and steps described in these embodiments do not limit the scope of the present invention.

[0031] Of course, the above description is only a specific embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. All equivalent changes or modifications made according to the structure, characteristics and principles described in the patent application scope of the present invention should be included in the patent application scope of the present invention.

[0032] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A multi-channel pinch valve for deep sea sampling, characterized in that: A valve body including a built-in cavity and a driving device; The valve body is provided with a plurality of installation channels for the flexible hose to pass through around the cavity as the center, and a radial channel for connecting the cavity and the installation channel, wherein a valve body assembly for squeezing the flexible hose is arranged in the radial channel, and the installation channel does not pass through the cavity; A self-rotating wheel is arranged in the cavity, and a groove is arranged on the circumference of the self-rotating wheel; The valve body assembly comprises a clamping tube push head for squeezing a flexible hose and a return spring, wherein the return spring is fixed to one end of the clamping tube push head close to the cavity, and the other end of the return spring is provided with a spring sleeve, the outer side of the spring sleeve is in sliding contact with the circumference of the rotating wheel, the inner wall of the radial channel is axially provided with a limiting slide groove, and the clamping tube push head is provided with a limiting block that is slidably matched with the limiting slide groove; The driving device is used to provide driving force for the self-rotating wheel.

2. The multi-channel pinch valve for deep sea sampling according to claim 1, characterized in that: The shape of the groove is constructed using a velocity curve.

3. The multi-channel pinch valve for deep sea sampling according to claim 2, characterized in that: The shape of the groove adopts a constant velocity curve.

4. The multi-channel pinch valve for deep sea sampling according to claim 1, characterized in that: The spring sleeve is provided with a ceramic ball which matches the shape of the groove.

5. The multi-channel pinch valve for deep sea sampling according to claim 1, characterized in that: The inner wall of the installation channel is provided with a plug which cooperates with the tube clamping push head to clamp the flexible hose.

6. The multi-channel pinch valve for deep sea sampling according to claim 1, characterized in that: The driving device comprises an outer shell and a progressive motor arranged in the outer shell, and the progressive motor is connected to the rotation center of the rotating wheel through a coupling.

7. The multi-channel pinch valve for deep sea sampling according to claim 1, characterized in that: The outer shell is filled with oil.

8. The multi-channel pinch valve for deep sea sampling according to claim 1, characterized in that: The output end of the driving device is also provided with a potentiometer, and the current orientation angle of the groove is determined based on the resistance value displayed by the potentiometer.

9. The multi-channel pinch valve for deep sea sampling according to claim 1, characterized in that: The installation channel is arranged parallel to the rotation axis of the rotating wheel in the cavity.

10. The multi-channel pinch valve for deep sea sampling according to claim 1, characterized in that: The tube clamping push head is used to squeeze the flexible hose and is in the shape of an ear. The axis of the central circular hole in the ear shape is parallel to the axis of the installation channel.

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