Valve element driving structure
The valve core driving structure separates memory alloy wire and valve core cavities with a baffle, addressing temperature-induced issues and space constraints, ensuring faster response and compact design for applications like automobile seat ventilation valves.
Patent Information
- Application Number
- CN202411381245.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2024-12-27
AI Technical Summary
Valve cores using memory alloy directly as the core lack air isolation measures, leading to temperature-induced response speed and displacement issues, and require excessive space due to consistent displacement and deformation directions, limiting their application in compact designs.
A valve core driving structure with a baffle separating the memory alloy wire and valve core into independent cavities, using a driving rod mechanism to control the valve core, minimizing ambient temperature effects and reducing overall length while maintaining accuracy and speed.
The solution provides faster response times and compact design suitability, enabling applications in high-space-compactness environments like automobile seat ventilation valves with improved gas flow accuracy.
Smart Images
Figure CN119196387A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of valve cores, and in particular to a valve core driving structure. Background Art
[0002] The valve core, as the core component of the valve, plays a pivotal role in the field of fluid control. The main function of the valve core is to control the flow of the fluid and adjust the flow and pressure of the medium by changing the relative position, angle or groove opening state between the valve core and the valve seat. This regulation can be performed manually or through electric, pneumatic or hydraulic automatic control devices.
[0003] The valve core driven by memory alloy is a technology that uses the material properties of memory alloy to achieve valve control. In the valve, the memory alloy valve core realizes the opening and closing control of the valve by changing its shape. When the valve needs to be closed, a specific current or heat is applied to the memory alloy valve core to activate it, causing it to change its shape and thus block the pipeline; when the valve needs to be opened, current or heat is applied again, and the memory alloy returns to its original shape, allowing the pipeline to be unblocked.
[0004] However, this valve core drive structure that uses memory alloy directly as the valve core lacks air isolation measures for the memory alloy wire. When used in hot or cold areas, the air at the external ambient temperature will affect the temperature of the memory alloy wire itself, thereby affecting the response speed and displacement stroke of the valve core. In addition, the use of memory alloy directly as the valve core means that the displacement direction of the valve core is consistent with the deformation direction of the memory alloy. When designing the shell, sufficient displacement space is required in the same stroke direction, and the length of the valve becomes longer, which cannot be better applied in some applications that require high space compactness. Summary of the invention
[0005] In order to solve the above problems, the present invention provides a valve core driving structure, which can not only reduce the adverse effect of ambient temperature on the working of the memory alloy wire but also meet the requirements of valve miniaturization design.
[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: a valve core driving structure is provided, including a base, a valve core, a memory alloy wire and a driving rod, the base is provided with a baffle, the valve core is arranged on the front side of the baffle, the driving rod is arranged on the rear side of the baffle, the driving rod includes a memory alloy wire mounting seat and a push rod, the memory alloy wire is installed on the memory alloy wire mounting seat, the push rod includes a first rod body and a second rod body, the first rod body and the second rod body are perpendicular to each other in the same horizontal plane, the first rod body connects the memory alloy wire mounting seat and the second rod body, a notch with an opening direction obliquely upward is provided on the side of the valve core close to the baffle, a vertical groove penetrating with the notch is also provided on the side of the valve core close to the baffle, the first rod body is inserted into the vertical groove after passing through the baffle, the part of the first rod body passing through the baffle is in contact with the surface of the baffle, the second rod body is embedded in the notch and the radial sides of the second rod body are respectively in contact with the upper and lower inner walls of the notch.
[0007] Furthermore, the total length of the memory alloy wire is 30 mm, and the memory alloy wire is a U-shaped wire.
[0008] Furthermore, the memory alloy wire mounting seat includes a sliding base, a U-shaped upper seat is provided above the sliding base, the U-shaped wire is wound on the U-shaped upper seat, and the two ends of the U-shaped wire are energized ends.
[0009] Furthermore, the base is provided with a pin fixing hole, which is used to fix a clamping terminal, through which the end of the memory alloy wire is clamped, and the pin of the clamping terminal is plugged into a PCB board to energize the memory alloy wire.
[0010] Furthermore, taking the horizontal direction as a reference direction, the inclination angle of the notch is 30° to 60°.
[0011] Furthermore, the inclination angle of the notch is 45°.
[0012] Furthermore, a guide groove is provided at the bottom of the memory alloy wire mounting seat, and a guide column is provided on the base. When the memory alloy wire mounting seat moves forward and backward under the drive of the memory alloy wire, the guide groove moves forward and backward along the guide column.
[0013] Furthermore, a return spring is provided in the guide groove, and two ends of the return spring are respectively connected to the front inner wall of the guide groove and the front outer surface of the guide post.
[0014] Furthermore, the upper surface of the valve core is provided with a circular groove for the rubber pad to be embedded in.
[0015] Furthermore, the contact surface material between the second rod body and the notch is any one of Teflon, PBT and ABS.
[0016] The technical solution of the present invention has the following advantages:
[0017] 1. The memory alloy wire in the present invention is not used directly as a valve core function, but first acts on the driving rod, and then the driving rod acts on the valve core, so that the cavity space where the valve core is located can be separated from the cavity space where the memory alloy wire works, and then a baffle is arranged between the memory alloy wire and the valve core, so that the cavity space where the valve core is located can form an independent valve chamber, and the valve core moves up and down away from or close to the air port to complete the opening or closing of the air port, and the gas only circulates with the gas in the valve chamber where the valve core is located. The memory alloy wire is not affected by the hot or cold gas under the external ambient temperature, and is only deformed by the heat generated by the electric current. The deformation amount is more accurate and the response speed is faster.
[0018] 2. The valve core drive structure of the present invention can make the length of the valve body shorter while maintaining the original space width in the width direction of the valve body. Therefore, the valve core drive structure can be used in a ventilation valve with a more compact overall layout, meeting the miniaturized design of the ventilation valve, and can be used on a large scale in some applications that have high requirements for space compactness and high requirements for gas flow accuracy, such as automobile seat ventilation valves.
[0019] 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.
[0020] 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
[0021] 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:
[0022] Figure 1 It is a schematic diagram of the overall structure of the valve core driving structure of the present invention.
[0023] Figure 2 It is a schematic cross-sectional structure diagram of the valve core driving structure of the present invention.
[0024] Figure 3 It is a structural schematic diagram of the valve core in the valve core driving structure of the present invention.
[0025] Figure 4 It is a structural schematic diagram of the driving rod in the valve core driving structure of the present invention.
[0026] Description of Figure Numbers:
[0027] 1-valve core; 2-driving rod; 3-base; 4-clamping terminal; 5-memory alloy wire; 6-reset spring; 101-notch; 102-circular groove; 103-vertical groove; 201-second rod body; 202-first rod body; 203-sliding base; 204-U-shaped profile upper seat; 301-guide column; 302-baffle. DETAILED DESCRIPTION
[0028] 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.
[0029] 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.
[0030] The valve core drive structure that uses memory alloy directly as the valve core lacks air isolation measures for the memory alloy wire. When used in hot or cold areas, the air at the external ambient temperature will affect the temperature of the memory alloy wire itself, thereby affecting the response speed and displacement stroke of the valve core. In addition, the use of memory alloy directly as the valve core means that the displacement direction of the valve core is consistent with the deformation direction of the memory alloy. When designing the shell, sufficient displacement space is required in the same stroke direction. The length of the valve becomes longer, which cannot be better applied in some applications that require high space compactness.
[0031] Based on the above problems, an embodiment of the present invention provides a valve core driving structure, which can not only reduce the influence of the external ambient temperature on the working state of the memory alloy wire, but also meet the requirements of the valve being used in some applications with high space compactness requirements.
[0032] See also Figures 1 to 4 As shown, an embodiment of the present invention provides a valve core driving structure, including a base 3, a valve core 1, a memory alloy wire 5 and a driving rod 2, wherein a baffle 302 is provided on the base 3, the valve core 1 is arranged on the front side of the baffle 302, the driving rod 2 is arranged on the rear side of the baffle 302, the driving rod 2 includes a memory alloy wire 5 mounting seat and a push rod, the memory alloy wire 5 is installed on the memory alloy wire 5 mounting seat, the push rod includes a first rod body 202 and a second rod body 201, the first rod body 202 and the second rod body 201 are perpendicular to each other in the same horizontal plane, the first rod body 202 is connected to the memory alloy wire 5, and the memory alloy wire 5 is installed on the memory alloy wire 5 mounting seat. The alloy wire 5 mounting seat and the second rod body 201, the side of the valve core 1 close to the baffle 302 is provided with a slot 101 with an opening direction obliquely upward, and the side of the valve core 1 close to the baffle 302 is also provided with a vertical slot 103 that penetrates the slot 101, the part of the first rod body 202 that passes through the baffle 302 is in contact with the surface of the baffle 302, and the first rod body 202 is inserted into the vertical slot 103 after passing through the baffle 302, and the second rod body 201 is embedded in the slot 101 and the radial sides of the second rod body 201 are respectively in contact with the upper and lower inner walls of the slot 101.
[0033] In the embodiment of the present invention, a baffle plate 302 is arranged on the base 3. The baffle plate 302 can be a half baffle plate with a circular concave surface on the top, or a full baffle plate with a circular hole for the first cylinder to pass through. The half baffle plate 3 is combined with the other half baffle plate adaptively arranged on the inner wall of the valve body to block the front and back sides of the baffle plate into two cavity spaces. A valve core 1 is arranged on the front side of the baffle plate 302, and a driving rod 2 is arranged on the rear side of the baffle plate 302. The memory alloy wire 5 is completely located on the rear side of the baffle plate 302 and does not share a cavity space with the valve core 1. The valve core 1 and the memory alloy wire 5 each have their own cavity space. The memory alloy wire 5 is not directly used as the valve core 1, but is used by first It acts on the driving rod 2, and then the driving rod 2 acts on the valve core 1, so that the cavity space where the valve core 1 is located can be separated from the cavity space where the memory alloy wire 5 works, and then the baffle 302 is arranged between the memory alloy wire 5 and the valve core 1, so that the cavity space where the valve core 1 is located can form an independent valve chamber, and the valve core 1 moves up and down away from or close to the air port to complete the opening or closing of the air port, and the gas only circulates with the gas in the valve chamber where the valve core 1 is located. The memory alloy wire 5 is not affected by the hot or cold gas under the external ambient temperature, and is only deformed by the heat generated by the electric current. The deformation amount is more accurate and the response speed is faster.
[0034] In some embodiments of the present invention, the total length of the memory alloy wire 5 is 30 mm, and the memory alloy wire 5 is a U-shaped wire. Under the condition of ensuring the output displacement, force value, and life, a 3% strain of the total length of the memory alloy wire 5 is usually used as the working stroke of the memory alloy wire 5. At this length, the displacement that can be generated by the U-shaped wire is about 30 / 2*3%=0.5 mm, which can ensure the gas flow rate and also ensure that there will not be too much noise. In addition, after the 30 mm long memory alloy wire 5 is turned into a U-shaped structure, the original space width can be maintained in the width direction, and the occupied length space can be shortened, so that the valve core drive structure can be used in a vent valve with a more compact overall layout, meeting the miniaturized design of the vent valve.
[0035] In some embodiments of the present invention, the memory alloy wire 5 mounting seat includes a sliding base 203, a U-shaped profile upper seat 204 is provided above the sliding base 203, the U-shaped wire is wound on the U-shaped profile upper seat 204, and the two ends of the U-shaped wire are energized ends. The U-shaped wire is wound on the upper seat which also has a U-shaped profile so that the memory alloy wire 5 and the driving rod 2 fit better, and the force applied to the driving rod 2 by the memory alloy wire 5 after deformation is more effective.
[0036] In some embodiments of the present invention, a pin fixing hole is also provided on the base 3, and the pin fixing hole is used to fix the clamping terminal 4. The end of the memory alloy wire 5 is clamped by the clamping terminal 4. The pin of the clamping terminal 4 is plugged into the PCB board for the memory alloy wire 5 to be energized, thereby improving the current stability of the memory alloy wire 5 when it is energized.
[0037] In some embodiments of the present invention, taking the horizontal direction as a reference direction, the inclination angle of the notch 101 is 30° to 60°.
[0038] In some embodiments of the present invention, the inclination angle of the notch 101 is 45°.
[0039] Table 1 is a table of experimental data related to the movement of the valve core 1 at different notch 101 inclination angles when the deformation of the memory alloy wire 5 remains unchanged at 1 mm after power is applied and the output force value is 2N.
[0040] Table 1
[0041]
[0042] Table 2 is a table of relevant experimental data of the memory alloy wire 5 at different inclination angles of the notch 101 when the memory alloy wire 5 keeps the displacement of the valve core 1 unchanged by 0.5 mm after power is turned on and the output force value of the memory alloy wire 5 is 2N.
[0043] Table 2
[0044]
[0045] Combining the experimental data in Table 1 and Table 2, it can be seen that the force value of the valve core 1 reaches the maximum when the inclination angle of the notch 101 is 45° to the horizontal plane. As the inclination angle of the notch 101 of the valve core 1 increases, the maximum static friction force that the valve core 1 can overcome also increases, but the output force value efficiency decreases. If the displacement of the valve core 1 is maintained at 0.5mm, the required length of the memory alloy wire 5 increases with the increase of the angle. The increase in the length of the wire will lead to an increase in the volume of the vent valve, and the size is not advantageous. When used on a car seat as a lumbar support and massage module, the space is not compact enough.
[0046] After considering the advantages and disadvantages of various aspects, the inclination angle of the notch 101 is preferably designed to be 30°, 45° or 60°. According to different application scenarios, for massage chairs with high requirements for compact space, it can be preferably designed to be 45°, which meets the requirements of small size and large flow ventilation.
[0047] In some embodiments of the present invention, a guide groove is provided at the bottom of the memory alloy wire 5 mounting seat, and a guide column 301 is provided on the base 3. When the memory alloy wire 5 mounting seat moves forward and backward under the drive of the memory alloy wire 5, the guide groove moves forward and backward along the guide column 301, thereby improving the stability of the memory alloy wire 5 mounting seat when moving forward and backward, avoiding deviation, and ensuring the stability of the travel distance of the valve core 1.
[0048] In some embodiments of the present invention, a return spring 6 is provided in the guide groove, and the two ends of the return spring 6 are respectively connected to the front inner wall of the guide groove and the front outer surface of the guide column 301. The return spring 6 is added to accelerate the recovery of the deformation of the memory alloy wire 5 under the action of the return force of the return spring 6 after the memory alloy wire 5 is powered off.
[0049] In some embodiments of the present invention, the upper surface of the valve core 1 is provided with a circular groove 102 for the rubber pad to be embedded in, so as to improve the air tightness between the surrounding of the air port and the upper surface of the valve core 1 .
[0050] In some embodiments of the present invention, the contact surface material between the second rod body 201 and the notch 101 is any one of Teflon, PBT, and ABS, which has good lubricity and reduces friction.
[0051] The working principle of the valve core driving structure of the embodiment of the present invention is: the memory alloy wire 5 is energized. Since the memory alloy wire 5 has the characteristic of contracting after being energized, the combined force finally formed by the contraction force generated by the memory alloy wire 5 after being energized and the force of the reset spring 6 causes the driving rod 2 to move backward. Since the second rod body 201 is arranged in the groove 101 of the valve core 1, the second rod body 201 moves backward and moves backward along the inner wall of the groove 101, and the valve core 1 moves downward, away from the air port, and the air port is connected to the cavity space where the valve core 1 is located to perform gas exchange.
[0052] When the memory alloy wire 5 is powered off, the memory alloy wire 5 is accelerated to recover to the initial shape under the return force of the reset spring 6. During the process of recovering to the initial shape, the memory alloy wire 5 drives the driving rod 2 to move forward. While the second rod body 201 moves forward, it pushes the valve core 1 upward by contacting the inner wall of the notch 101. After the valve core 1 moves upward for a certain distance, the upper surface of the valve core 1 contacts the gas port, and the external gas cannot enter the cavity space where the valve core 1 is located, and the gas in the cavity space where the valve core 1 is located cannot flow out through the gas port. Therefore, by controlling the power on and off of the memory alloy wire 5, the valve core 1 can realize the function of accurately controlling the gas flow in the valve.
[0053] In the whole process, the forward and backward movement of the driving rod 2 is converted into the up and down movement of the valve core 1. Compared with the traditional valve core 1 driving method, it solves the problem of large valve size caused by the long total displacement stroke of the valve core 1 and the driving member brought by the traditional driving structure, and can be widely used in small vent valves. Since the inclination angle of the notch 101 can be designed according to needs, this valve core driving structure can also adapt to the needs of different valves by adjusting the inclination angle of the notch 101. For example, on a small flow air pump with compact space and on a high-end car with high requirements for the utilization rate of the internal space and high requirements for the massage accuracy of the car seat, as a vent valve for car seat massage, the inclination angle of the notch 101 can be selected to be 30° or 45°, and the inclination angle of the notch 101 can be selected to be 45° for a vent valve used for a large flow air pump or a home massage seat. Similarly, the wire diameter of the memory alloy wire 5 can also be selected according to the needs of different valves.
[0054] When the valve core 1 or the memory alloy wire 5 is damaged, the valve core 1 and the memory alloy wire 5 in the embodiment of the present invention can be replaced separately without having to be replaced as a whole, which makes replacement more convenient and saves costs.
[0055] By comparing the corresponding speeds of the vent valve using the valve core drive structure of the embodiment of the present invention and the existing vent valves on the market, it can be seen that the valve core drive structure of the embodiment of the present invention greatly improves the response speed of the vent valve in extreme environments. The response speed comparison data of the vent valve using the valve core drive structure of the embodiment of the present invention and the existing vent valves on the market under different ambient temperatures are shown in Table 3.
[0056] Table 3
[0057]
[0058] It can be seen from Table 3 that the memory alloy wire 5 and the valve core 1 in the embodiment of the present invention are not in the same cavity, but in an independent cavity, with less contact with the flowing air, which to a certain extent ensures the heat generated by the current on the wire and prevents heat loss, so the response speed is faster in a low temperature environment.
[0059] 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 valve core driving structure, characterized in that: The valve body is provided with a first rod body and a second rod body, and the first rod body and the second rod body are perpendicular to each other in the same horizontal plane. The first rod body connects the memory alloy wire mounting seat and the second rod body. A slot with an opening direction obliquely upward is provided on the side of the valve body close to the baffle. A vertical slot passing through the slot is also provided on the side of the valve body close to the baffle. The first rod body is inserted into the vertical slot after passing through the baffle. The part of the first rod body passing through the baffle is in contact with the surface of the baffle. The second rod body is embedded in the slot and the radial sides of the second rod body are respectively in contact with the upper and lower inner walls of the slot.
2. The valve core driving structure according to claim 1, characterized in that: The total length of the memory alloy wire is 30 mm, and the memory alloy wire is a U-shaped wire.
3. The valve core driving structure according to claim 2, characterized in that: The memory alloy wire mounting seat comprises a sliding base, a U-shaped upper seat is arranged above the sliding base, the U-shaped wire is wound on the U-shaped upper seat, and the two ends of the U-shaped wire are energized ends.
4. The valve core driving structure according to claim 1, characterized in that: The base is also provided with a pin fixing hole, which is used to fix a clamping terminal. The end of the memory alloy wire is clamped by the clamping terminal, and the pin of the clamping terminal is plugged into a PCB board to energize the memory alloy wire.
5. The valve core driving structure according to claim 1, characterized in that: Taking the horizontal direction as the reference direction, the inclination angle of the notch is 30° to 60°.
6. The valve core driving structure according to claim 5, characterized in that: The inclination angle of the notch is 45°.
7. The valve core driving structure according to claim 1, characterized in that: A guide groove is provided at the bottom of the memory alloy wire mounting seat, and a guide column is provided on the base. When the memory alloy wire mounting seat moves forward and backward under the drive of the memory alloy wire, the guide groove moves forward and backward along the guide column.
8. The valve core driving structure according to claim 7, characterized in that: A return spring is arranged in the guide groove, and two ends of the return spring are respectively connected to the front inner wall of the guide groove and the front outer surface of the guide post.
9. The valve core driving structure according to claim 1, characterized in that: The upper surface of the valve core is provided with a circular groove for the rubber pad to be embedded.
10. The valve core driving structure according to claim 1, characterized in that: The contact surface material between the second rod body and the notch is any one of Teflon, PBT and ABS.