Electric control microfluid valve with switch detection function
The DC reducer motor drives the extrusion column to rotate and uses the current monitoring circuit to detect current changes, so as to realize the switching control of the microfluidic valve, solving the problem of the microfluidic valve in fluid control accuracy, and is suitable for biochemical detection and medical and health fields. It has the characteristics of high efficiency, safety and low cost.
Patent Information
- Application Number
- CN202411326147.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-23
- Publication Date
- 2024-12-27
AI Technical Summary
When existing microfluidic valves control the internal fluid distribution and transportation of elastic hoses with small pipe diameters, they lack effective switching detection functions, resulting in inaccurate fluid control and difficult to meet the needs of biochemical testing and medical and health fields.
The DC reducer motor drives the extrusion column to rotate, and combines the motor current monitoring circuit to detect current changes, so as to realize switching control of the elastic hose to ensure fluid conduction or blockage.
It realizes the precise distribution and delivery of micro-upgraded fluids, ensures safety and hygiene, is suitable for biochemical testing and medical and health fields, and has the advantages of simple structure, small size and low cost.
Smart Images
Figure CN119196341A_ABST
Abstract
Description
Technical Field The patent of this invention relates to an electrically controlled microfluidic valve with a switch detection function. Background Art The present invention relates to an electrically controlled microfluidic valve with a switch detection function, which is used to control the distribution and delivery of fluid inside an elastic hose with a small diameter. Usually, the diameter is in the millimeter level, and the capacity of the internal fluid is measured in microliters. When the microfluidic valve controls the DC reduction motor to drive the extrusion column to detach from the elastic hose, the fluid inside the elastic hose can flow freely. When the DC reduction motor drives the extrusion column to rotate, it squeezes the elastic hose until the flow of fluid in the elastic hose is blocked, thereby achieving the purpose of shutting off. The microfluidic valve controls the switch of the valve by detecting the change of the current flowing through the DC reduction motor through the motor current monitoring circuit. The elastic hose of the microfluidic valve is made of non-toxic materials such as silicone, and the microfluidic valve has no direct contact with the fluid in the elastic hose. Therefore, the microfluidic valve described in the present invention can be used in biochemical detection, medical and health fields. Summary of the invention The patent of this invention provides a microfluidic valve with a simple structure, which can control the distribution and delivery of microliter-level fluid inside an elastic hose by detecting the peak value of the motor current. It is safe and hygienic, small in size, and can be used in biochemical testing, medical and health fields.
[0004] The structure of the patent of the present invention includes an elastic hose, a DC reduction motor, an extrusion column, a valve body, a top cover and a motor current monitoring circuit. The output shaft end of the DC reduction motor passes through a through hole and engages with the extrusion column. The extrusion column is located between the DC reduction motor and the valve body. The top of the valve body is provided with a through hole and covered with a top cover. Pipe openings for the elastic hose to pass through are opened on both sides of the valve body. The elastic hose is attached to the inner wall of the valve body and is connected to the outside through the pipe openings on both sides of the valve body. The valve body is fastened above the DC reduction motor. The motor current monitoring circuit detects the current flowing through the DC reduction motor to control the switch of the microfluidic valve. Further: the extrusion column includes a column head for extruding the elastic hose, and the extrusion column is driven by a DC reduction motor to rotate around the output shaft end, and the elastic hose is squeezed by the column head to shut it off, and the column head leaves the elastic hose to control the flow of the internal fluid, thereby forming a shut-off or conduction control of the fluid in the elastic hose. Furthermore: the elastic hose is located between the extrusion column and the inner wall of the valve body, and lubricating liquid is poured between the extrusion column and the inner wall of the valve body through a through hole provided at the top of the valve body to reduce friction loss. Furthermore: the elastic hose is fixed by adhesive at the pipe openings opened on both sides of the valve body for the elastic hose to pass through, so as to prevent the elastic hose from moving. Furthermore: the switch of the microfluidic valve is controlled by detecting the change of the current flowing through the DC reduction motor. When the squeezing column squeezes the elastic hose and completely closes its tube wall, the current flowing through the DC reduction motor reaches the maximum peak value; and when the squeezing column is separated from the elastic hose, the current value will decrease until it reaches a fixed constant value. Therefore, the switch of the microfluidic valve is controlled by detecting the change of the current flowing through the DC reduction motor through the current detection circuit. After adopting the above structure, the patent of the present invention drives the extrusion column to rotate through a DC reduction motor, and utilizes the extrusion column to extrude the elastic hose to perform on-off control of fluid conduction. BRIEF DESCRIPTION OF THE DRAWINGS The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. Figure 1 It is a schematic diagram of the top view of the structure of the patent of this invention. Figure 2 It is a schematic diagram of the structure of the patent of this invention. Figure 3 This is a schematic diagram of the relationship between the DC reduction motor current and the friction resistance experienced by the extrusion column in the patent of this invention. DETAILED DESCRIPTION like Figure 1 and Figure 2 A microfluidic valve is shown, characterized in that it includes an elastic hose 1, a DC reduction motor 2, an extrusion column 3, a valve body 4, a top cover 5 and a motor current monitoring circuit 6, the output shaft end of the DC reduction motor 2 passes through a through hole and engages with the extrusion column 3, the extrusion column 3 is located between the DC reduction motor 2 and the valve body 4, and pipe openings for the elastic hose 1 to pass through are opened on both sides of the valve body 4. The elastic hose 1 is attached to the inner wall of the valve body 4 and is connected to the outside through the pipe openings on both sides of the valve body 4, and the valve body 4 is fastened above the DC reduction motor 2. Before work, install the elastic hose on the inner wall of the valve body 4, inject lubricating fluid between the extrusion column 3 and the inner wall of the valve body 4 through the hole opened on the top of the valve body 4 to reduce friction loss, and then cover the top cover 5 to prevent leakage of the lubricating fluid. Use adhesive to fix the body of the elastic hose 1 at the pipe openings on both sides of the valve body 4 for the elastic hose 1 to pass through. The two ends of the elastic hose 1 extend from the two pipe openings on the valve body 4 respectively. When it is necessary to block the fluid delivery, start the DC reduction motor 2 to drive the extrusion column 3 to rotate, and use the extrusion column 3 to squeeze the elastic hose 1. Figure 3 As shown, when the motor current monitoring circuit 6 detects that the current flowing through the DC reduction motor 2 reaches a peak value ( Figure 3When the current value indicated by the cut-off point is reached, the power supply is stopped, and the microfluidic valve is closed, blocking the fluid transportation in the elastic hose 1. When the fluid transportation is required, the motor current monitoring circuit 6 supplies power to the DC reduction motor 2 to drive the extrusion column 3 to rotate and separate from the elastic hose 1 to open the fluid transportation. The design has the advantages of simple structure, small size, easy manufacturing, low cost, practicality and high efficiency.
Claims
1. An electrically controlled microfluidic valve with a switch detection function, characterized in that: The invention comprises an elastic hose (1), a DC reduction motor (2), an extrusion column (3), a valve body (4), a top cover (5) and a motor current monitoring circuit (6). The output shaft end of the DC reduction motor (2) passes through a through hole and meshes with the extrusion column (3). The extrusion column (3) is located between the DC reduction motor (2) and the valve body (4). The top of the valve body (4) is provided with a through hole and covered with a top cover (5). Both sides of the valve body (4) are provided with pipe openings for the elastic hose (1) to pass through. The elastic hose (1) is attached to the inner wall of the valve body (4) and communicates with the outside through the pipe openings on both sides of the valve body (4). The valve body (4) is fastened above the DC reduction motor (2). The motor current monitoring circuit (6) detects the current flowing through the DC reduction motor (2) to control the switch of the microfluidic valve.
2. The electrically controlled microfluidic valve with switch detection function according to claim 1, characterized in that: The squeezing column (4) comprises a column head for squeezing the elastic hose (1), and the squeezing column (3) is driven by a DC reduction motor (2) to rotate around the output shaft end, and the elastic hose (1) is squeezed by the column head to be shut off, and the column head leaves the elastic hose (1) to allow the internal fluid to flow, thereby forming a shut-off or conduction control of the fluid in the elastic hose (1).
3. The electrically controlled microfluidic valve with switch detection function according to claim 1, characterized in that: The elastic hose (1) is located between the extrusion column (3) and the inner wall of the valve body (4), and lubricating liquid is poured between the extrusion column (3) and the valve body (4) to reduce friction loss.
4. The electrically controlled microfluidic valve with switch detection function according to claim 1, characterized in that: The elastic hose (1) is fixed by adhesive at the pipe openings opened on both sides of the valve body (4) for the elastic hose (1) to pass through, so as to prevent the elastic hose from moving.
5. The electrically controlled microfluidic valve with switch detection function according to claim 1, characterized in that: The opening and closing of the microfluidic valve is controlled by detecting the change of the current flowing through the DC reduction motor (2). When the squeezing column (3) squeezes the elastic hose (1) and makes its tube wall completely closed, the friction resistance of the DC reduction motor (2) reaches a peak value, so the current flowing through the DC reduction motor (2) reaches a maximum peak value; and when the squeezing column (3) is separated from the elastic hose (1), the current value will decrease until it reaches a fixed constant value. Therefore, the opening and closing of the microfluidic valve is controlled by detecting the change of the current flowing through the DC reduction motor (2) through the motor current monitoring circuit (6).
6. The electrically controlled microfluidic valve with switch detection function according to claim 1, characterized in that: The elastic hose (1) is made of silicone material, but is not limited to this material.