High-precision micro-fluidic electric valve

Abstract

The utility model provides a high-precision microfluidic electrically operated valve, which relates to the technical field of valves, and comprises a gear box, two gear sets are arranged in the gear box, a power input assembly is arranged at the bottom of one gear set, the power input assembly comprises a speed reducer and a servo motor, the servo motor is arranged at the bottom of the speed reducer, and the servo motor is arranged at the bottom of the speed reducer. The power input assembly drives the two gear sets to move, then the direction of force is modified, then the force is transmitted to the linear displacement assembly, the linear displacement assembly changes the direction of the force from rotating motion to linear motion to push the valve needle body, and the multi-sensor assembly is responsible for sensing the stress condition and the displacement amount of the control valve assembly. The opening degree of the valve is controlled to realize micro flow control and prevent the needle valve body from being damaged by too large force.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve technical field especially relates to high accuracy micro -fluidic electric valve. BACKGROUND

[0002] In today's rapid development of science and technology era, micro -fluidic technology has become one of the key technologies indispensable in many fields, and it has shown great application potential and value in biomedical detection, chip laboratory, fine chemical synthesis, environmental monitoring and food science etc.

[0003] In the field of petroleum scientific research, the accurate control of fluid is very important. In many experiments of petroleum scientific research, such as microscopic analysis experiment of petroleum composition, it is necessary to accurately control the flow of fluid participating in reaction or detection. With the deepening of research and the development of technology, the precision, stability and reliability of micro -fluidic system are required higher and higher in the process of experiment and analysis.

[0004] Traditional valves gradually expose many limitations in the application of petroleum scientific research instruments, for example, mechanical valve due to its structural characteristics, there is the problem of insufficient precision in micro -flow control, it is difficult to realize the accurate adjustment of small flow, and it cannot meet the demand of trace material analysis and microscopic experimental condition precision control in modern petroleum scientific research.

[0005] However, due to its structural characteristics, the traditional mechanical valve has a large dead volume, which makes it difficult to achieve high precision in micro -fluid control. Its limited precision and particle pollution easily produced in the switching process make it difficult to meet the complex demand of such high precision micro -fluidic operation.

[0006] Therefore, we propose a high precision micro -fluidic electric valve. INVENTION CONTENTS

[0007] The utility model discloses a purpose to solve the shortcoming in prior art, and the traditional mechanical valve has a large dead volume due to its structural characteristics, which makes it difficult to achieve high precision in micro -fluid control. Its limited precision and particle pollution easily produced in the switching process make it difficult to meet the complex demand of such high precision micro -fluidic operation.

[0008] In order to realize the above-mentioned purpose, the utility model adopts the following technical scheme:

[0009] The high precision micro -fluidic electric valve, including gear box, the inside of gear box is equipped with two gear sets, and the bottom of one gear set is equipped with power input assembly, and the power input assembly includes speed reducer and servo motor, and the bottom of speed reducer is equipped with servo motor;

[0010] Another bottom of the gear group is provided with a linear displacement assembly, the linear displacement assembly comprises a screw rod shell, a screw rod body, a moving installation shell and a plurality of positioning pins, the screw rod body is installed at the bottom of the gear group, the outer side of the screw rod body is provided with the screw rod shell, the bottom of the screw rod body is provided with the moving installation shell, and the moving installation shell and the screw rod shell are provided with the plurality of positioning pins;

[0011] The bottom of the linear displacement assembly is also provided with a multi-sensor assembly, the multi-sensor assembly comprises an assembly shell, a displacement sensor and a torque sensor, one side of the assembly shell is provided with the displacement sensor, and the other side of the assembly shell is provided with the torque sensor;

[0012] The bottom of the multi-sensor assembly is provided with a control valve assembly, the control valve assembly comprises a valve needle body, a valve body and a communication groove, the two sides of the inner bottom of the valve body are provided with the communication groove, and the connection position of the communication groove is provided with the valve needle body.

[0013] As a preferred scheme of the utility model, the control valve assembly further comprises a valve needle pressing cap, a valve needle upper pressing pad, a valve needle protection pad, a valve needle sealing pad and a valve needle lower pressing pad.

[0014] As a preferred scheme of the utility model, the valve needle pressing cap is installed at the top of the inner part of the valve body and located at the outer side of the valve needle body, the bottom of the valve needle pressing cap is provided with the valve needle upper pressing pad, and the valve needle body penetrates through the valve needle upper pressing pad.

[0015] As a preferred scheme of the utility model, the bottom of the valve needle upper pressing pad is provided with two valve needle lower pressing pads, the valve needle sealing pad is arranged between the two valve needle lower pressing pads, and the valve needle body penetrates through the two valve needle lower pressing pads and the valve needle sealing pad.

[0016] As a preferred scheme of the utility model, the left side of the communication groove is a liquid inlet groove, the right side is a liquid outlet groove, the valve needle body is used for being inserted in the communication groove and is used for controlling the inlet and outlet amount of the communication groove.

[0017] As a preferred scheme of the utility model, the valve needle body is inserted in the inner part of the assembly shell, the movement of the assembly shell can drive the displacement of the valve needle body, and then the valve needle body is inserted in the communication groove.

[0018] As a preferred scheme of the utility model, the displacement sensor is used for sensing the displacement amount of the valve needle body, and the torque sensor is used for sensing the torque borne by the valve needle body.

[0019] Compared with the prior art, the utility model has the beneficial effects that:

[0020] The utility model discloses a power input assembly drives two gear sets to move, and then realizes the direction of the force, and then the force is transmitted to the linear displacement assembly, and the linear displacement assembly changes the direction of the force from the rotary motion to the linear motion and pushes the valve needle body, and the multi-sensor assembly is responsible for the force condition and displacement of the control valve assembly, and the control valve opening size realizes the small flow control and prevents the valve needle body from being damaged by too much force. BRIEF DESCRIPTION OF DRAWINGS

[0021] Fig. 1 The utility model provides a high accuracy micro -fluidic electric valve's main part structure schematic drawing;

[0022] Fig. 2 The utility model provides a high accuracy micro -fluidic electric valve's part structure section schematic drawing;

[0023] Fig. 3 The utility model provides a high accuracy micro -fluidic electric valve's control valve subassembly internal structure schematic drawing.

[0024] Legend explanation: 1, gear box;2, speed reducer;3, servo motor;4, screw housing;5, gear set;6, screw body;7, remove installation shell;8, positioning pin;9, displacement sensor;10, torque sensor;11, valve needle body;12, valve body;13, valve needle pressure cap;14, valve needle upper pressure pad;15, valve needle protection pad;16, communication groove;17, valve needle sealing pad;18, valve needle lower pressure pad;19, subassembly shell. DETAILED DESCRIPTION

[0025] The technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0026] In order to facilitate the understanding of the utility model, the utility model will be described more fully below in conjunction with the related utility model, and several embodiments of the utility model are given. However, the utility model can be realized in many different forms, and is not limited to the embodiments described in the text. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.

[0027] It is to be understood that where an element such as a layer, region or substrate is described as being "on" another element, it can be directly on the other element or intervening elements can also be present. Where an element is described as being "connected" or "coupled" to another element, it can be directly connected or coupled or intervening elements can be present. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0029] Embodiments

[0030] As Figs. 1-3 The utility model provides a technical scheme: high accuracy micro -fluidic electric valve, including gear box 1, gear box 1 is one of the key components of whole device, has played the role of containing and supporting internal component, it provides a stable environment for subsequent power transmission and motion conversion, with each component can work together, ensure the high accuracy operation of electric valve, it is equipped with two gear sets 5 in its inside, two gear sets 5 are important structure that realizes the direction change and transmission of force.

[0031] The bottom of one gear set 5 is equipped with power input component, and the power input component includes a speed reducer 2 and a servo motor 3, the bottom of the speed reducer 2 is equipped with the servo motor 3, and the power input component is the power source starting part of the whole electric valve, the servo motor 3 has high-precision speed control ability and can accurately output the required rotary power.

[0032] The speed reducer 2 reduces the speed and increases the torque, so that the output power is more suitable for the transmission requirements of the subsequent gear set 5, and the cooperation of the speed reducer 2 and the servo motor 3 provides stable and accurately controllable power input for the whole system, ensuring the accuracy and reliability of the electric valve during operation. The working principle is that the servo motor 3 outputs a certain speed of rotary power according to the external control signal, and after the speed reduction and torque increase processing of the speed reducer 2, the appropriate power is transmitted to the gear set 5 connected thereto.

[0033] The bottom of the other gear set 5 is provided with a linear displacement assembly, which includes a lead screw housing 4, a lead screw body 6, a moving mounting housing 7 and a plurality of positioning pins 8. The lead screw body 6 is installed at the bottom of the gear set 5, the outer side of the lead screw body 6 is provided with the lead screw housing 4, the bottom of the lead screw body 6 is provided with the moving mounting housing 7, and the moving mounting housing 7 and the lead screw housing 4 are provided with the plurality of positioning pins 8.

[0034] The main function of the linear displacement assembly is to convert the rotary motion transmitted by the gear set 5 into linear motion. The lead screw body 6 rotates under the drive of the gear set 5. Due to the limitation of the lead screw housing 4, the moving mounting housing 7 cooperating with the lead screw body 6 can only move linearly along the axial direction of the lead screw.

[0035] The positioning pins 8 ensure the stability and accuracy of the moving mounting housing 7 during movement, preventing it from deviating or shaking. This design enables the linear displacement assembly to accurately convert rotary force into linear thrust, providing reliable power support for the operation of the control valve assembly.

[0036] The working principle is based on the principle of lead screw transmission. The rotary motion of the lead screw body 6 is converted into linear motion of the moving mounting housing 7 through the action of the thread. The positioning pins 8 further ensure the accuracy and stability of the linear motion.

[0037] The bottom of the linear displacement assembly is also provided with a multi-sensor assembly, which includes an assembly housing 19, a displacement sensor 9 and a torque sensor 10. The displacement sensor 9 is installed on one side of the assembly housing 19, and the torque sensor 10 is installed on the other side of the assembly housing 19. The multi-sensor assembly is an important part of the intelligent control and protection of the electric valve.

[0038] The displacement sensor 9 can sense the displacement of the valve needle body 11 in real time and convert the displacement into an electrical signal to feed back to the control system. The control system can accurately grasp the position of the valve needle, thereby achieving precise control of the valve opening.

[0039] The torque sensor 10 is responsible for sensing the torque borne by the valve needle body 11. When the torque exceeds the set value, it indicates that the valve needle may be subjected to excessive resistance or abnormal conditions. At this time, the torque sensor 10 will transmit a signal to the control system, and the control system can take appropriate measures, such as stopping the motor from running, to prevent the valve needle body 11 from being damaged due to excessive force.

[0040] The working principle is based on the physical characteristics of the sensor. The displacement sensor 9 generates an electrical signal change corresponding to the relative displacement of the object, and the torque sensor 10 converts the deformation or stress change caused by the force into an electrical signal output.

[0041] The bottom of the multi-sensor assembly is provided with a control valve assembly, the control valve assembly includes a valve needle body 11, a valve body 12 and a communication groove 16, both sides of the inner bottom of the valve body 12 are provided with the communication groove 16, the connection of the communication groove 16 is provided with the valve needle body 11, and the control valve assembly is a part directly controlling the fluid flow.

[0042] The valve body 12 serves as a shell, providing installation and working space for the valve needle body 11 and the communication groove 16, the left side of the communication groove 16 is a liquid inlet groove, and the right side is a liquid outlet groove, the valve needle body 11 is used for being inserted into the communication groove 16, by changing the insertion depth of the valve needle body 11 in the communication groove 16, the inlet and outlet amount of the communication groove 16 can be controlled, thereby realizing accurate control of the micro flow.

[0043] When the valve needle body 11 is inserted into the communication groove 16 deeply, the passage through which the fluid passes is narrowed, and the flow is reduced; on the contrary, when the valve needle body 11 is inserted shallowly, the flow is increased.

[0044] The control valve assembly further includes a valve needle pressing cap 13, a valve needle upper pressing pad 14, a valve needle protection pad 15, a valve needle sealing pad 17 and a valve needle lower pressing pad 18, which further optimize the performance of the control valve assembly.

[0045] The valve needle pressing cap 13 is installed at the top of the inner part of the valve body 12 and located outside the valve needle body 11, which plays a role in fixing and protecting the top of the valve needle body 11, preventing displacement or falling out of the valve needle body 11 during movement.

[0046] The valve needle upper pressing pad 14 and the valve needle lower pressing pad 18 can provide buffering and stable support when the valve needle body 11 moves, reduce the friction and wear between the valve needle body 11 and the valve body 12, and at the same time ensure the movement accuracy of the valve needle body 11 in the vertical direction.

[0047] The valve needle sealing pad 17 ensures the sealing of the inside of the valve body 12, prevents fluid leakage and ensures the accuracy of flow control.

[0048] The valve needle protection pad 15 can prevent the valve needle body 11 from being damaged when subjected to external force impact, prolonging the service life of the valve needle body 11.

[0049] The bottom of the valve needle pressing cap 13 is provided with the valve needle upper pressing pad 14, the valve needle body 11 penetrates through the valve needle upper pressing pad 14, and the valve needle upper pressing pad 14 plays a role in buffering and positioning between the valve needle pressing cap 13 and the valve needle body 11.

[0050] When the valve needle body 11 moves up and down, the valve needle upper pressing pad 14 can absorb part of the impact force, reduce the wear between the valve needle body 11 and the valve needle pressing cap 13, and at the same time ensure that the valve needle body 11 always moves in the correct vertical direction, improving the stability and reliability of the movement of the valve needle body 11.

[0051] The bottom of the valve needle upper pressing pad 14 is provided with two valve needle lower pressing pads 18, and a valve needle sealing pad 17 is arranged between the two valve needle lower pressing pads 18. The valve needle body 11 penetrates the two valve needle lower pressing pads 18 and the valve needle sealing pad 17. The two valve needle lower pressing pads 18 further enhance the support and buffering effect of the valve needle body 11. At the same time, the valve needle sealing pad 17 is arranged between the two valve needle lower pressing pads 18, which can better ensure the sealing of the valve body 12.

[0052] The valve needle body 11 penetrates these components. Under the premise of ensuring sealing and stable support, precise linear motion control is realized, thereby effectively controlling the inlet and outlet amount of the communication groove 16 and realizing precise adjustment of the small flow.

[0053] The left side of the communication groove 16 is the liquid inlet groove, and the right side is the liquid outlet groove. The valve needle body 11 is used for inserting into the communication groove 16 to control the inlet and outlet amount of the communication groove 16. This structure design makes the fluid enter from the liquid inlet groove and flow to the liquid outlet groove through the gap between the valve needle body 11 and the communication groove 16.

[0054] By changing the position of the valve needle body 11 in the communication groove 16, the cross-sectional area of the fluid passing through can be accurately adjusted, thereby realizing precise control of the flow. The deeper the valve needle body 11 is inserted, the smaller the cross-sectional area of the fluid passing through, and the smaller the flow. The shallower the valve needle body 11 is inserted, the larger the cross-sectional area of the fluid passing through, and the larger the flow.

[0055] The valve needle body 11 is inserted into the inside of the assembly shell 19. The movement of the assembly shell 19 can drive the valve needle body 11 to displace and then be inserted into the communication groove 16. The assembly shell 19 is connected with the linear displacement assembly. When the linear displacement assembly converts the rotary motion into linear motion and pushes the assembly shell 19 to move, the assembly shell 19 drives the valve needle body 11 to move synchronously, so that the valve needle body 11 can accurately insert into or leave the communication groove 16, thereby realizing control of the inlet and outlet amount of the communication groove 16. This connection mode ensures that the displacement of the valve needle body 11 is accurately synchronized with the motion of the linear displacement assembly, thereby improving the precision and response speed of the flow control.

[0056] The displacement sensor 9 is used for sensing the displacement amount of the valve needle body 11, and the torque sensor 10 is used for sensing the torque borne by the valve needle body 11. The displacement sensor 9 converts the displacement change of the valve needle body 11 relative to the initial position into an electrical signal and feeds back to the control system. The control system judges the current position of the valve needle body 11 according to the displacement signal, thereby accurately controlling the opening size of the valve and realizing precise control of the small flow.

[0057] The torque sensor 10 monitors the torque of the valve needle body 11 in real time during the working process, and once the torque exceeds the preset safety range, it indicates that the valve needle body 11 may encounter blockage or other abnormal resistance, and the torque sensor 10 will immediately send a signal to the control system, and the control system takes corresponding protective measures, such as stopping the motor operation or adjusting the position of the valve needle body 11, to prevent the valve needle body 11 from being damaged due to excessive force, thereby ensuring the reliability and stability of the electric valve.

[0058] Workflow summary:

[0059] Firstly, the servo motor 3 starts to output a certain rotating power according to the instruction of the control system, and the power is transmitted to one of the gear sets 5 after being reduced and increased in torque by the speed reducer 2.

[0060] The gear set 5 transmits the power to another gear set 5 to change the direction of the force, and then the changed force is transmitted to the linear displacement assembly, and the screw body 6 rotates under the drive of the gear set 5, so that the moving installation shell 7 moves linearly along the screw shaft, converting the rotary motion into linear thrust.

[0061] Then, the linear displacement assembly pushes the component shell 19 of the multi-sensor assembly to move, and the component shell 19 drives the valve needle body 11 to move synchronously, and the valve needle body 11 inserts into or leaves the communication groove 16 of the valve body 12, and the valve needle body 11 controls the inlet and outlet of the communication groove 16 by changing the insertion depth of the valve needle body 11 in the communication groove 16, thereby realizing the control of the micro flow.

[0062] In this process, the displacement sensor 9 senses the displacement of the valve needle body 11 in real time and feeds back the signal to the control system, and the control system adjusts the valve opening degree according to the displacement; the torque sensor 10 monitors the torque of the valve needle body 11 in real time, and when the torque exceeds the set value, it sends a signal to the control system in time, and the control system takes corresponding protective measures to prevent the valve needle body 11 from being damaged.

[0063] During the whole process, various components work cooperatively to realize the function of high-precision micro-fluidic electric valve through accurate power transmission, motion conversion and sensor feedback control.

[0064] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. High-precision microfluidic motorized valve comprising a gearbox (1), characterized in that: The inside of the gear box (1) is provided with two gear sets (5), one of which is provided with a power input assembly at the bottom, which includes a speed reducer (2) and a servo motor (3), and the bottom of the speed reducer (2) is provided with a servo motor (3); The bottom of the other gear set (5) is provided with a linear displacement assembly, which includes a screw rod shell (4), a screw rod body (6), a moving installation shell (7) and a plurality of positioning pins (8), the screw rod body (6) is installed at the bottom of the gear set (5), the outer side of the screw rod body (6) is provided with a screw rod shell (4), the bottom of the screw rod body (6) is provided with a moving installation shell (7), and a plurality of positioning pins (8) are arranged between the moving installation shell (7) and the screw rod shell (4); The bottom of the linear displacement assembly is also provided with a multi-sensor assembly, which includes an assembly shell (19), a displacement sensor (9) and a torque sensor (10), one side of the assembly shell (19) is provided with a displacement sensor (9), and the other side of the assembly shell (19) is provided with a torque sensor (10); The bottom of the multi-sensor assembly is provided with a control valve assembly, which includes a valve needle body (11), a valve body (12) and a communication groove (16), the inside bottom of the valve body (12) is provided with a communication groove (16) on both sides, and the connection of the communication groove (16) is provided with a valve needle body (11).

2. The high precision microfluidic electrovalve according to claim 1, characterized in that: The control valve assembly further includes a valve needle pressure cap (13), a valve needle upper pressure pad (14), a valve needle protection pad (15), a valve needle sealing pad (17) and a valve needle lower pressure pad (18).

3. The high precision microfluidic electrovalve according to claim 2, characterized in that: The valve needle pressure cap (13) is installed at the top of the inside of the valve body (12) and located outside the valve needle body (11), the bottom of the valve needle pressure cap (13) is provided with a valve needle upper pressure pad (14), and the valve needle body (11) penetrates the valve needle upper pressure pad (14).

4. The high precision microfluidic electrovalve according to claim 3, characterized in that: The bottom of the valve needle upper pressure pad (14) is provided with two valve needle lower pressure pads (18), and a valve needle sealing pad (17) is arranged between the two valve needle lower pressure pads (18), and the valve needle body (11) penetrates the two valve needle lower pressure pads (18) and the valve needle sealing pad (17).

5. The high precision microfluidic electrovalve according to claim 4, characterized in that: The left side of the communication groove (16) is a liquid inlet groove, and the right side is a liquid outlet groove, the valve needle body (11) is used for inserting into the communication groove (16) to control the inlet and outlet amount of the communication groove (16).

6. The high precision microfluidic electrovalve according to claim 5, characterized in that: The valve needle body (11) is inserted into the inside of the assembly shell (19), and the movement of the assembly shell (19) can drive the displacement of the valve needle body (11) to be inserted into the communication groove (16).

7. The high precision microfluidic electrovalve according to claim 6, characterized in that: The displacement sensor (9) is used for sensing the displacement of the valve needle body (11), and the torque sensor (10) is used for sensing the torque borne by the valve needle body (11).

Images