Pinch valve based on memory alloy driving
By using memory alloy drive wire control valve core in the pinch valve, a compact and integrated valve control is achieved, which solves the problems of large weight and waste of materials in the traditional solenoid pinch valve, and achieves precise control and service life of fluid in the capillary tube. extension.
Patent Information
- Application Number
- CN202411774908.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-05
- Publication Date
- 2025-02-14
AI Technical Summary
When traditional solenoid tube valves control the switch of trace reagents or liquids, the solenoid coil occupies most of the weight and volume, resulting in a large system weight and volume, and it is easy to become a consumable in medical testing, resulting in waste of raw materials.
The clamp valve driven by memory alloy is used to control the valve core through the memory alloy drive wire to realize the opening and closing of the valve port, and the chuck is independent outside the pipeline to avoid contamination of liquid or reagents by valve body seal failure.
It realizes small size and highly integrated valve control, avoids the dependence of traditional valves on seals, improves the precise control ability of fluid in the capillary, extends service life, and reduces waste of raw materials.
Smart Images
Figure CN119435757A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of valves, and in particular to a pinch valve driven by a memory alloy. Background Art
[0002] Valves driven by memory alloys take advantage of the memory effect and superelastic properties of shape memory alloys. When a shape memory alloy is subjected to an external force, its shape changes; when the external force disappears and it is heated to a certain temperature, the shape memory alloy can return to its original shape. This property makes shape memory alloys an ideal material for manufacturing valves. In the valve, the memory alloy valve core realizes the opening and closing control of the valve by changing its shape.
[0003] The mainstream pinch valves on the market are often used to control the switch of trace reagents / liquids in medical instruments, or other application scenarios that require a small flow rate. Usually, such pinch valves are mostly solenoid valves. In order to achieve a good opening and closing effect, the electromagnetic coil needs to occupy most of the weight and volume. Usually in the test, it is necessary to control multiple groups of reagent / liquid flow channels, so multiple groups of electromagnetic pinch valves need to be installed on the mounting seat, and then intervene in the control system. Therefore, the flow channel control system composed of traditional electromagnetic pinch valves is heavy and large in volume. Summary of the invention
[0004] In order to solve the above problems, the present invention provides a pinch valve driven by memory alloy, which controls the opening and closing of the valve port through the movement of the valve core to achieve liquid flow or exchange. The clamp of this solution is completely independent of the pipeline to prevent the contamination of the liquid or reagent due to the failure of the valve body's own seal.
[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: a pinch valve driven by a memory alloy is provided, comprising an upper valve body and a lower valve body, wherein the upper valve body and the lower valve body are enclosed to form a valve cavity inside, wherein a memory alloy driving wire, a valve core, a reset torsion spring and a sheet-shaped terminal are arranged in the valve cavity, wherein the sheet-shaped terminal clamps the two end portions of the memory alloy driving wire respectively, and the sheet-shaped terminal is used for conducting electricity, wherein the reset torsion spring is arranged below the valve core, wherein a first groove for embedding the memory alloy driving wire is arranged at the lower end of the valve core, wherein the top of the valve core is a pointed top, wherein a second groove for leaking out of the pointed top is arranged on the upper valve body, and a third groove for embedding a capillary is arranged on the lower valve body, wherein when the memory alloy driving wire is energized, it contracts to generate downward pressure on the valve core, and the pointed top moves downward and thus away from the capillary; when the memory alloy driving wire is de-energized, the elastic force generated by the reset torsion spring on the valve core causes the pointed top to move upward, and the pointed top clamps the capillary.
[0006] Furthermore, the diameter of the memory alloy driving wire ranges from 30 μm to 100 μm.
[0007] Furthermore, the sheet-shaped terminal includes a first connection part, a second connection part and a third connection part, the first connection part and the second connection part are vertically connected, the third connection part is connected to the bottom end of the second connection part, the third connection part is bent to embed the memory alloy drive wire, and the first connection part is arched toward the upper valve body.
[0008] Furthermore, the upper valve body is provided with a positioning slot for the sheet-shaped terminal, and the first connecting portion is arched toward the upper valve body and then embedded in the positioning slot for fixation.
[0009] Furthermore, one end of the return torsion spring is connected to the bottom surface of the lower valve body, and the other end is connected to the bottom surface of the valve core.
[0010] Furthermore, the upper valve body and the lower valve body are made of any one of PEEK, ABS or PBT.
[0011] Furthermore, the memory alloy driving wire comprises a first straight wire portion, a second straight wire portion and a curved portion connecting the first straight wire portion and the second straight wire portion, and an angle between the first straight wire portion and the second straight wire portion is 100° to 150°.
[0012] Furthermore, the angle between the two side edges of the pointed top is 30° to 60°.
[0013] The technical solution of the present invention has the following advantages:
[0014] 1. The pinch valve designed by the present invention is compact and can be highly integrated into the control circuit or used alone. The valve body itself has no additional sealing requirements and is completely independent of the liquid and pipeline. The valve core of a traditional solenoid valve or memory alloy valve needs to be equipped with a sealing gasket to contact the through hole. In order to prevent the liquid from flowing into the outside, sealing is inevitable. Compared with traditional solenoid valves or memory alloy valves, the present invention does not require special sealing.
[0015] 2. The structure of the present invention can realize precise control of the fluid in the capillary by turning the power on and off of the memory alloy driving wire. When the power is on, the memory alloy driving wire contracts and the valve core moves downward, thereby opening the clamped capillary and allowing the liquid or reagent in the capillary to flow. When the power is not on, the memory alloy driving wire is relatively soft, and the reset torsion spring can push the memory alloy driving wire upward to clamp the capillary and block the flow of liquid or reagent. The control process is simple. The deformation degree of the memory alloy driving wire can be accurately adjusted by adjusting the power-on voltage, thereby accurately controlling the displacement value of the valve core, and then accurately controlling the fluid in the capillary.
[0016] It should be appreciated that all combinations of the foregoing concepts, as well as additional concepts described in greater detail below, may be considered to be part of the inventive subject matter of the present disclosure, provided such concepts are not mutually inconsistent.
[0017] The foregoing and other aspects, embodiments and features of the present invention can be more fully understood from the following description in conjunction with the accompanying drawings. Other additional aspects of the present invention, such as the features and / or beneficial effects of the exemplary embodiments, will be apparent from the following description or learned from the practice of the specific embodiments according to the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The accompanying drawings are not drawn to scale according to actual reference objects. In the accompanying drawings, each identical or nearly identical component shown in various figures may be represented by the same reference numeral. For the sake of clarity, not every component is labeled in each figure. Now, embodiments of various aspects of the present invention will be described by way of example and with reference to the accompanying drawings, in which:
[0019] Figure 1 It is a structural explosion diagram of the pinch valve driven by the memory alloy according to the present invention.
[0020] Figure 2 It is a schematic diagram of the pinch valve driven by the memory alloy according to the present invention when it is applied to a capillary tube.
[0021] Figure 3 It is a schematic diagram of assembling the memory alloy driving wire and the sheet-shaped terminal in the present invention.
[0022] Figure 4 The figure is a schematic diagram of the internal structure of the pinch valve driven by the memory alloy according to the present invention.
[0023] Figure numerals: 1-lower valve body; 2-reset torsion spring; 3-sheet terminal; 4-memory alloy drive wire; 5-valve core; 6-upper valve body; 7-capillary; 8-third groove. DETAILED DESCRIPTION
[0024] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Unless otherwise defined, the technical terms or scientific terms used herein should be the common meaning understood by people with general skills in the field to which the present invention belongs.
[0025] The words "first", "second" and similar words used in the patent application specification and claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, unless the context clearly indicates otherwise, the singular forms of "a", "an" or "the" and other similar words do not indicate a quantitative limitation, but indicate the existence of at least one. Words such as "include" or "comprise" mean that the elements or objects appearing before "include" or "comprise" cover the features, wholes, steps, operations, elements and / or components listed after "include" or "comprise", and do not exclude the existence or addition of one or more other features, wholes, steps, operations, elements, components and / or their collections. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.
[0026] The mainstream pinch valves on the market are often used in medical instruments to control the switch of trace reagents or liquids, or other application scenarios that require a small flow rate. Usually, such pinch valves are mostly solenoid valves. In order to achieve a good opening and closing effect, the electromagnetic coil needs to occupy most of the weight and volume. Usually, in the test, it is necessary to control multiple groups of reagents or liquid flow channels, so multiple groups of electromagnetic pinch valves need to be installed on the mounting base, and then intervene in the control system. Therefore, the flow channel control system composed of traditional electromagnetic pinch valves is heavy and large in volume.
[0027] In addition, in medical testing, such valves are usually used as consumables and are discarded after a certain number of uses, such as 1,000 times, resulting in a waste of raw materials. The pinch valve made of memory alloy drive wire can effectively solve the above problems.
[0028] See also Figures 1 to 4As shown, an embodiment of the present invention provides a pinch valve driven by a memory alloy, comprising an upper valve body 6 and a lower valve body 1, wherein the upper valve body 6 and the lower valve body 1 are enclosed to form a valve cavity inside, wherein a memory alloy driving wire 4, a valve core 5, a reset torsion spring 2 and a sheet-shaped wiring terminal 3 are arranged in the valve cavity, wherein the sheet-shaped wiring terminal 3 clamps the two end portions of the memory alloy driving wire 4 respectively, and the sheet-shaped wiring terminal 3 is used for conducting electricity, the reset torsion spring 2 is arranged below the valve core 5, and the lower end of the valve core 5 is provided with a spring for embedding the memory alloy driving wire 4. The first groove of the memory alloy driving wire 4, the top of the valve core 5 is a pointed top, the upper valve body 6 is provided with a second groove for the pointed top to leak out, and the lower valve body 1 is provided with a third groove 8 for the capillary 7 to embed. When the memory alloy driving wire 4 is energized, it contracts and generates downward pressure on the valve core 5, and the pointed top moves downward and away from the capillary 7; when the memory alloy driving wire 4 is de-energized, the elastic force generated by the reset torsion spring 2 on the valve core 5 causes the pointed top to move upward, and the pointed top clamps the capillary 7.
[0029] In some embodiments of the present invention, the diameter of the memory alloy driving wire 4 ranges from 30 μm to 100 μm.
[0030] In some embodiments of the present invention, the memory alloy drive wire 4 can be a 76μm drive wire. To prevent misstart, the phase change temperature As during power-on heating is greater than 70°C, and the phase change temperature Mf during power-off cooling is greater than 35°C. When powered on, it contracts, driving the valve core 5 to move downward, thereby opening the clamped capillary 7 and allowing the liquid or reagent in the capillary 7 to flow; when not powered on, the memory alloy drive wire 4 is relatively soft, and the reset torsion spring 2 can push the memory alloy drive wire 4 upward, clamp the capillary 7, and block the flow of liquid or reagent.
[0031] In some embodiments of the present invention, the sheet-shaped terminal 3 includes a first connection portion, a second connection portion and a third connection portion, the first connection portion and the second connection portion are vertically connected, the third connection portion is connected to the bottom end of the second connection portion, the third connection portion is bent to embed the memory alloy drive wire 4, and the first connection portion is arched toward the upper valve body 6. The sheet-shaped terminal 3 is made of phosphor bronze, which ensures strength and has a certain elasticity. The arched portion is higher than the surface of the upper valve body 6, which is convenient for conducting electricity and introducing current into the memory alloy drive wire 4.
[0032] In some embodiments of the present invention, a positioning slot for the sheet-like terminal 3 is provided on the upper valve body 6, and the first connecting portion is arched toward the upper valve body 6 and then embedded in the positioning slot for fixation, thereby further stabilizing the position of the memory alloy driving wire 4 and preventing displacement.
[0033] In some embodiments of the present invention, one end of the reset torsion spring 2 is connected to the bottom surface of the lower valve body 1, and the other end is connected to the bottom surface of the valve core 5. The reset torsion spring 2 is used to push the valve core 5 upward when no power is supplied. The two ends of the reset torsion spring 2 are bent 90 degrees, one short end is supported at the bottom of the valve core 5, and the other end is supported inside the valve body, thereby stabilizing the up and down movement of the valve core 5.
[0034] In some embodiments of the present invention, the upper valve body 6 and the lower valve body 1 are made of any one of PEEK, ABS or PBT, and are made of hard and self-lubricating materials such as PEEK, ABS or PBT to reduce friction during the movement of the valve core 5.
[0035] In some embodiments of the present invention, the memory alloy driving wire 4 includes a first straight wire portion, a second straight wire portion and a curved portion connecting the first straight wire portion and the second straight wire portion, and the angle between the first straight wire portion and the second straight wire portion is 100° to 150°, and the optimal angle is preferably 120°.
[0036] In some embodiments of the present invention, the angle between the two sides of the pointed top is 30° to 60°. The angle and the radius of the pointed top can be adjusted according to the material and size of the capillary 7. For a slightly harder capillary 7, the angle between the two sides of the pointed top can be 30°, and the radius of the two sides of the pointed top can be 0.1mm-0.2mm; for a slightly softer capillary 7, the angle between the two sides of the pointed top can be 60°, and the radius of the tip can be 0.2mm-0.3mm.
[0037] The structure of the present invention can also be combined with external algorithm control to adjust the opening position of the valve core 5 and accurately control the flow rate in the capillary tube 7.
[0038] In summary, the pinch valve designed by the present invention is compact and can be highly integrated into the control circuit or used alone. The valve body itself has no additional sealing requirements and is completely independent of the liquid and the pipeline. The valve core 5 of the traditional solenoid valve or memory alloy valve needs to be equipped with a sealing gasket to contact the through hole. In order to prevent the liquid from flowing into the outside, sealing is inevitable. Compared with the traditional solenoid valve or memory alloy valve, the present invention does not require special sealing.
[0039] Since the memory alloy is sensitive to electric current, the memory alloy driving wire 4 in the present invention can be further controlled by an algorithm, such as flow feedback PWM control to become a proportional valve, so as to more accurately control the flow of the reagent in the valve.
[0040] The pinch valve of the present invention can be applied to control the flow of liquid in the capillary tube 7. The capillary tube 7 is a pipe with an extremely fine inner diameter, and its working principle is mainly based on capillary phenomenon and throttling effect. Due to the effect of liquid surface tension, the liquid will automatically rise or fall in the capillary tube 7, thereby realizing automatic transportation of the liquid. At the same time, when the liquid passes through the capillary tube 7, due to the extremely small inner diameter of the pipe, the liquid will be subject to greater resistance, thereby realizing flow control. In some application occasions, it is extremely important to accurately control the flow of the capillary tube 7: 1. Ensure stable operation of the system. In the refrigeration system, the capillary tube 7, as a throttling mechanism, can maintain the required pressure difference between the condenser and the evaporator, so that the low-pressure refrigerant absorbs heat and evaporates in the evaporator, and the high-pressure refrigerant releases heat and condenses in the condenser. By accurately controlling the flow of the refrigerant, the stable operation of the refrigeration system can be ensured, and the system can avoid failures caused by excessive or too small flow. 2. Improve energy utilization efficiency. In chemical production, the capillary tube 7 is widely used in heat exchangers due to its high specific surface area and good thermal conductivity. By precisely controlling the flow rate of the liquid, efficient and uniform heat energy transfer can be achieved, thereby improving energy utilization efficiency. 3. Optimize product quality. Many chemical reactions require precise raw material ratios and reaction conditions. The capillary 7 is used as a precision flow meter to accurately control the flow rate of the liquid, thereby ensuring the smooth progress of the chemical reaction and the high quality of the product. 4. Protect equipment and operational safety. In some experiments or production processes, if the liquid flow rate is too large, it may cause equipment overload or damage. Flow control through the capillary 7 can effectively avoid this situation and protect the normal operation of the equipment and the safety of the operator.
[0041] Therefore, the pinch valve designed in the present invention has important economic value and a wide range of application scenarios, and has broad prospects.
[0042] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. A person with ordinary knowledge in the technical field to which the present invention belongs may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the definition of the claims.
Claims
1. A pinch valve driven by memory alloy, characterized in that: The invention comprises an upper valve body and a lower valve body, wherein the upper valve body and the lower valve body are enclosed to form a valve cavity inside, wherein a memory alloy driving wire, a valve core, a reset torsion spring and a sheet-shaped terminal are arranged in the valve cavity, wherein the sheet-shaped terminal respectively clamps the two end portions of the memory alloy driving wire, the sheet-shaped terminal is used for conducting electricity, the reset torsion spring is arranged below the valve core, the lower end of the valve core is provided with a first groove for embedding the memory alloy driving wire, the top of the valve core is a pointed top, the upper valve body is provided with a second groove for the pointed top to leak out, the lower valve body is provided with a third groove for the capillary to be embedded, when the memory alloy driving wire is energized, it contracts to generate downward pressure on the valve core, and the pointed top moves downward and away from the capillary; when the memory alloy driving wire is de-energized, the elastic force generated by the reset torsion spring on the valve core causes the pointed top to move upward, and the pointed top clamps the capillary.
2. The pinch valve driven by memory alloy according to claim 1, characterized in that: The diameter of the memory alloy driving wire ranges from 30 μm to 100 μm.
3. The pinch valve driven by memory alloy according to claim 1, characterized in that: The sheet-shaped terminal includes a first connection part, a second connection part and a third connection part, the first connection part and the second connection part are vertically connected, the third connection part is connected to the bottom end of the second connection part, the third connection part is bent to embed the memory alloy drive wire, and the first connection part is arched toward the upper valve body.
4. The pinch valve driven by memory alloy according to claim 3, characterized in that: The upper valve body is provided with a positioning slot for the sheet-shaped terminal, and the first connecting portion is arched toward the upper valve body and then embedded in the positioning slot for fixation.
5. The pinch valve driven by memory alloy according to claim 1, characterized in that: One end of the return torsion spring is connected to the bottom surface of the lower valve body, and the other end is connected to the bottom surface of the valve core.
6. The pinch valve driven by memory alloy according to claim 1, characterized in that: The upper valve body and the lower valve body are made of any one of PEEK, ABS or PBT.
7. The pinch valve driven by memory alloy according to claim 1, characterized in that: The memory alloy driving wire comprises a first straight wire portion, a second straight wire portion and a curved portion connecting the first straight wire portion and the second straight wire portion, and the angle between the first straight wire portion and the second straight wire portion is 100° to 150°.
8. The pinch valve driven by memory alloy according to claim 1, characterized in that: The angle between the two side edges of the pointed top is 30° to 60°.