Flow regulating valve

Abstract

This invention provides a flow regulating valve, comprising: a valve body having a valve cavity and a valve port communicating with each other; a valve core movably disposed within the valve cavity, the valve core having a first end and a second end disposed opposite to each other along the moving direction, the second end being used to block or open the valve port, and a sensing element disposed on the valve core; a drive assembly including a shape memory alloy wire and an elastic element, the length of the shape memory alloy wire being adjusted by changing the current of the shape memory alloy wire, both the shape memory alloy wire and the elastic element being drivenly connected to the valve core, and the shape memory alloy wire and the elastic element respectively providing opposite forces to the valve core to drive the valve core to reciprocate within the valve cavity; and a sensor, which cooperates with the sensing element to detect the position of the valve core within the valve cavity. The technical solution provided by this invention can solve the problem that existing electronic expansion valves are typically driven by a motor, making it impossible to obtain the position of the valve needle during operation, resulting in low control accuracy of the electronic expansion valve.

Description

Technical Field

[0001] This invention relates to the field of regulating valve technology, and more specifically, to a flow regulating valve. Background Technology

[0002] In refrigeration and air conditioning systems, electronic expansion valves are commonly used to regulate refrigerant flow to adapt to changes in system load. As a critical flow control component, the performance of the electronic expansion valve directly affects the system's energy efficiency and stability.

[0003] Currently, electronic expansion valves are usually driven by a motor. The position of the valve needle is adjusted by controlling the rotation of the motor, thereby regulating the refrigerant flow. However, the above method cannot obtain the position of the valve needle when it is moving. During long-term operation, the position of the valve needle is prone to deviation, resulting in inaccurate regulation of the refrigerant flow and low control accuracy of the electronic expansion valve. Summary of the Invention

[0004] This invention provides a flow regulating valve to solve the problem that electronic expansion valves in the prior art are usually driven by a motor, and the position of the valve needle cannot be obtained during operation, resulting in low control accuracy of the electronic expansion valve.

[0005] This invention provides a flow regulating valve, comprising: a valve body having a valve cavity and a valve port communicating with each other, the valve port being disposed at one end of the valve cavity; a valve core movably disposed within the valve cavity, the valve core having a first end and a second end disposed opposite to each other along the moving direction, the second end being used to block or open the valve port, and a sensing element disposed on the valve core; a drive assembly including a shape memory alloy wire and an elastic element, the length of the shape memory alloy wire being adjustable by changing the current of the shape memory alloy wire to adjust the length of the shape memory alloy wire, both the shape memory alloy wire and the elastic element being drivenly connected to the valve core, the shape memory alloy wire and the elastic element being respectively able to provide opposite forces to the valve core to drive the valve core to reciprocate within the valve cavity; and a sensor disposed within the valve body, the sensor cooperating with the sensing element to detect the position of the valve core within the valve cavity.

[0006] Furthermore, the shape memory alloy wire is located on the side of the valve core away from the valve port. The shape memory alloy wire connects the valve core and the valve body and is used to drive the valve core to open the valve port. One end of the elastic element abuts against the valve body, and the other end of the elastic element abuts against the valve core. The elastic element is used to drive the valve core to block the valve port. The shape memory alloy wire and the elastic element cooperate with each other to drive the valve core to block or open the valve port.

[0007] Furthermore, the middle of the shape memory alloy wire bypasses the valve core, and both ends of the shape memory alloy wire extend away from the valve port and are connected to the valve body.

[0008] Furthermore, the flow regulating valve also includes a rotating component, which is rotatably mounted on the valve core. The rotation axis of the rotating component is perpendicular to the movement direction of the valve core. A shape memory alloy wire is wound around the rotating component, and the shape memory alloy wire drives the valve core to move through the rotating component.

[0009] Furthermore, the valve core has a mounting groove, and the rotating part is disposed in the mounting groove.

[0010] Furthermore, the valve core has a first section, a middle section and a second section arranged sequentially along the moving direction. A step is formed between the middle section and the first and second sections. The cross-sectional dimension of the middle section along the moving direction of the valve core is larger than the cross-sectional dimensions of the first and second sections. The first section has a first end, and the middle section has a first stepped surface near the first end. One end of the elastic element abuts against the first stepped surface. The second section has a second end, and the mounting groove is located in the middle section.

[0011] Furthermore, an avoidance groove is provided on the outer wall of the middle section. The avoidance groove extends from one end of the middle section connected to the first section to the other end, and one end of the avoidance groove is connected to the mounting groove. Part of the shape memory alloy wire is located in the avoidance groove.

[0012] Furthermore, a balance channel is provided on the middle section, which connects the valve chambers at both ends of the valve core.

[0013] Furthermore, the middle section has a second stepped surface near the second end, and a connecting hole is provided on the second stepped surface. The connecting hole extends to the mounting groove. One end of the connecting hole is connected to the valve cavity located on the side of the second stepped surface facing the valve port, and the other end of the connecting hole is connected to the mounting groove. The connecting hole forms a balance channel.

[0014] Furthermore, the sensor is a linear Hall sensor, and the sensing element is a magnetic component. The linear Hall sensor can detect the distance between the magnetic component and the linear Hall sensor in real time.

[0015] Furthermore, the linear Hall sensor is located on the side of the valve core away from the valve port, and the magnetic element is disposed at the first end. The linear Hall sensor and the magnetic element are arranged along the moving direction of the valve core.

[0016] Furthermore, a placement groove is provided on the end face of the first end, and the magnetic component is located in the placement groove.

[0017] Furthermore, the valve body also includes a control chamber located at the end of the valve cavity away from the valve port. A circuit board is installed inside the control chamber, and a sensor is installed on the circuit board. Both the sensor and the shape memory alloy wire are electrically connected to the circuit board.

[0018] By employing the technical solution of this invention, a shape memory alloy wire and an elastic element are used in conjunction as a driving component to drive the valve core to block or open the valve body's port. This avoids the step loss phenomenon caused by using a motor as a driving component in existing technologies. Furthermore, the valve core is directly driven by the driving component, eliminating the need for transmission through a threaded structure. This avoids the influence of thread backlash during valve core movement and eliminates drift problems during forward and reverse adjustment, improving the response speed and adjustment accuracy of the flow control valve. Simultaneously, the built-in sensor, in conjunction with the sensing element on the valve core, can detect the valve core's position within the valve cavity in real time. The user can then adjust the on / off state of the shape memory alloy wire based on this position information, thereby adjusting its length and forming a closed-loop control. This compensates for valve core position deviations caused by external pressure or temperature, ensuring the valve core accurately reaches the open and closed positions, further improving flow control accuracy and guaranteeing stable system operation. Moreover, there is no motor noise during operation, enhancing the user experience. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0020] Figure 1 A partial cross-sectional view of the flow regulating valve provided by the present invention is shown.

[0021] Figure 2 This shows a first-view structural schematic diagram of the valve core provided by the present invention;

[0022] Figure 3 A second-view structural schematic diagram of the valve core provided by the present invention is shown;

[0023] Figure 4 It shows Figure 3 Partial sectional view along the AA direction;

[0024] Figure 5 A schematic diagram of the valve seat provided by the present invention is shown.

[0025] The above figures include the following reference numerals:

[0026] 10. Valve body; 101. Valve chamber; 102. Valve port; 103. Control chamber;

[0027] 20. Valve core; 201. First end; 202. Second end; 203. Mounting slot;

[0028] 21. First section; 22. Middle section; 221. First stepped surface; 222. Clearance groove; 223. Second stepped surface; 224. Connecting hole; 23. Second section; 231. Cutting surface;

[0029] 31. Shape memory alloy wire; 32. Elastic component;

[0030] 40. Rotating parts;

[0031] 51. Magnetic component; 52. Placement slot;

[0032] 60. Circuit board;

[0033] 70. Valve seat; 701. First assembly port; 702. Second assembly port; 703. Third assembly port; 71. First connecting pipe; 72. Second connecting pipe;

[0034] 80. Cover; 90. Mounting base;

[0035] 100. Sensors. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] like Figure 1 and Figure 2 As shown, this embodiment of the invention provides a flow regulating valve, which includes: a valve body 10, a valve core 20, a drive assembly, and a sensor 100. The valve body 10 has a valve cavity 101 and a valve port 102 that are interconnected, with the valve port 102 located at one end of the valve cavity 101. The valve core 20 is movably disposed within the valve cavity 101 and has a first end 201 and a second end 202 disposed opposite to each other along the moving direction. The second end 202 is used to block or open the valve port 102. A sensing element is provided on the valve core 20. The drive assembly includes a shape memory alloy wire 31 and an elastic element 32. The length of the shape memory alloy wire 31 is adjustable by changing the current to the shape memory alloy wire 31. Both the shape memory alloy wire 31 and the elastic element 32 are drivenly connected to the valve core 20, and the shape memory alloy wire 31 and the elastic element 32 can respectively provide opposite forces to the valve core 20 to drive the valve core 20 to reciprocate within the valve cavity 101. The sensor 100 is disposed inside the valve body 10, and the sensor 100 cooperates with the sensing element to detect the position of the valve core 20 within the valve cavity 101. The sensor 100 can be a linear Hall sensor, a magnetic sensor, or other displacement sensor, etc.

[0038] By employing the technical solution of this invention, a shape memory alloy wire 31 and an elastic element 32 are used in conjunction as a driving component to drive the valve core 20 to block or open the valve port 102 of the valve body 10. This avoids the step loss phenomenon caused by using a motor as a driving component in the prior art. Furthermore, the valve core 20 is directly driven by the driving component, eliminating the need for transmission through a threaded structure. This avoids the influence of thread clearance during valve core 20 movement and eliminates drift problems during forward and reverse adjustment, improving the response speed and adjustment accuracy of the flow control valve. Simultaneously, the built-in sensor 100, in conjunction with the sensing part on the valve core 20, can detect the position of the valve core 20 in the valve cavity 101 in real time. The user can then adjust the on / off state of the shape memory alloy wire 31 based on the position information, thereby adjusting its length and forming a closed-loop control. This compensates for positional deviations of the valve core 20 caused by external pressure or temperature, ensuring that the valve core 20 accurately reaches the opening and closing positions, further improving flow regulation accuracy and ensuring stable system operation. Moreover, there is no motor noise during operation, enhancing the user experience.

[0039] In this embodiment, the shape memory alloy wire 31 provides a driving force to the valve core 20 near the valve port 102, and the elastic element 32 provides a driving force to the valve core 20 away from the valve port 102; or the shape memory alloy wire 31 provides a driving force to the valve core 20 away from the valve port 102, and the elastic element 32 provides a driving force to the valve core 20 near the valve port 102.

[0040] In this application, the shape memory alloy wire 31 can be made of materials such as nickel-titanium alloy or copper-aluminum-nickel alloy. The shape memory alloy wire 31 is electrically connected to an external power source. When energized, the current passing through the shape memory alloy wire 31 will generate heat. When the temperature rises above the phase transition temperature, the length of the shape memory alloy wire 31 will shorten. When it is necessary to maintain or extend the length of the shape memory alloy wire 31, the current passing through the shape memory alloy wire 31 can be reduced to lower its temperature. When the temperature drops below the phase transition temperature, the length of the shape memory alloy wire 31 will return to its initial length.

[0041] like Figure 1 and Figure 2As shown, the shape memory alloy wire 31 is located on the side of the valve core 20 away from the valve port 102. The shape memory alloy wire 31 connects the valve core 20 and the valve body 10. The shape memory alloy wire 31 is used to drive the valve core 20 to open the valve port 102. When the shape memory alloy wire 31 is energized, it shortens, thereby pulling the valve core 20 away from the valve port 102, thus driving the valve core 20 to open the valve port 102. At this time, the elastic element 32 is compressed. One end of the elastic element 32 abuts against the valve body 10, and the other end abuts against the valve core 20. When the power is off or the current is low, the elastic element 32 can drive the valve core 20 to move towards the valve port 102 to seal the valve port 102. The shape memory alloy wire 31 and the elastic element 32 cooperate to drive the valve core 20 to seal or open the valve port 102. Furthermore, the above design allows the valve port 102 to be reliably closed even in the absence of power or in the event of a power outage, preventing abnormal refrigerant leakage and improving system safety.

[0042] In this application, the location of the elastic element 32 is not limited. In some embodiments, the two ends of the elastic element 32 can be connected to the ends of the valve body 10 and the valve core 20, respectively. In this embodiment, the elastic element 32 is a spring and is sleeved on the outer periphery of the valve core 20, which makes the driving force of the elastic element 32 on the valve core 20 more uniform.

[0043] In some embodiments, one end of the shape memory alloy wire 31 is connected to the valve body 10 and the other end is connected to the valve core 20, thereby driving the valve core 20 to move; in other embodiments, the other end of the shape memory alloy wire 31 may also bypass the valve core 20, thereby driving the valve core 20 to move.

[0044] Specifically, the shape memory alloy wire 31 passes around the valve core 20 in the middle, and both ends of the shape memory alloy wire 31 extend away from the valve port 102 and are connected to the valve body 10. This arrangement allows the shape memory alloy wire 31 to apply force more evenly when pulling the valve core 20, avoiding the valve core 20 from tilting during movement and improving the movement stability of the valve core 20.

[0045] like Figure 1As shown, the flow control valve also includes a rotating component 40, which is rotatably mounted on the valve core 20. The rotation axis of the rotating component 40 is perpendicular to the movement direction of the valve core 20. A shape memory alloy wire 31 is wound around the rotating component 40, and the shape memory alloy wire 31 drives the valve core 20 to move through the rotating component 40. The shape memory alloy wire 31 indirectly drives the valve core 20 through the rotating component 40, avoiding direct contact between the shape memory alloy wire 31 and the valve core 20, reducing wear caused by direct friction, extending the service life of the valve core 20, and also reducing the noise generated during the operation of the flow control valve. Furthermore, it can also avoid different driving forces on both sides of the valve core 20 due to different extension and contraction of the shape memory alloy wire 31 at different positions. The sliding connection between the shape memory alloy wire 31 and the rotating component 40 can ensure more uniform force on both sides of the valve core 20, preventing the valve core 20 from deflecting due to uneven force during movement, improving the reliability of the drive and the stability of the valve core 20's movement.

[0046] The rotating component 40 can be disposed on the outer wall of the valve core 20 or inserted inside the valve core 20. The rotating component 40 can be a fixed pulley or a rotating shaft, etc.

[0047] like Figure 1 , Figure 3 and Figure 4 As shown, the valve core 20 has a mounting groove 203, and the rotating component 40 is disposed within the mounting groove 203. The mounting groove 203 is provided so that at least part of the rotating component 40 is located inside the valve core 20, saving space in the valve cavity 101 and optimizing the spatial layout of the flow control valve.

[0048] In some embodiments of this application, the mounting groove 203 is disposed on the surface of the valve core 20. In other embodiments, the mounting groove 203 extends through both radial sides of the valve core 20, so that the entire rotating component 40 is located within the mounting groove 203. The mounting groove 203 can protect the rotating component 40, prevent the rotating component 40 from interfering with other components, and improve the stability of the rotation of the rotating component 40.

[0049] In this embodiment, the position of the mounting slot 203 is not limited. It can be set close to the first end 201, close to the second end 202, or between the first end 201 and the second end 202.

[0050] The valve core 20 has a through hole on its outer side wall, and the rotating part 40 is rotatably mounted on the valve core 20 by means of fasteners engaging with the through hole.

[0051] like Figures 2 to 4As shown, the valve core 20 has a first section 21, an intermediate section 22, and a second section 23 arranged sequentially along the moving direction. A step is formed between the intermediate section 22 and the first section 21 and the second section 23. The cross-sectional dimension of the intermediate section 22 along the extension direction of the valve core 20 is larger than the cross-sectional dimensions of the first section 21 and the second section 23. The first section 21 has a first end 201. This design optimizes the structure of the valve core 20, avoids the elastic element 32 occupying too much axial space after being sleeved on the outer periphery of the first section 21, and also reduces the size of the valve port 102, thereby optimizing the overall structure of the flow regulating valve and realizing the miniaturization of the flow regulating valve. The middle section 22 has a first stepped surface 221 near the first end 201. One end of the elastic element 32 abuts against the first stepped surface 221. The first stepped surface 221 provides a force-bearing surface for the valve core 20, ensuring that the driving force of the elastic element 32 can be evenly transmitted to the valve core 20 through the first stepped surface 221, avoiding excessive local stress caused by the small contact area between the elastic element 32 and the valve core 20. The second section 23 has a second end 202, and the mounting groove 203 is located on the middle section 22. This ensures the stability and straightness of the movement of the second end 202 when the shape memory wire 31 pulls the valve core 20, further improving the control accuracy of the flow regulating valve.

[0052] Furthermore, an avoidance groove 222 is provided on the outer wall of the intermediate section 22. The avoidance groove 222 extends from one end of the intermediate section 22 connected to the first section 21 to the other end, and one end of the avoidance groove 222 communicates with the mounting groove 203. Part of the shape memory alloy wire 31 is located within the avoidance groove 222. This avoids friction between the shape memory alloy wire 31 and the valve core 20 or other components when it contracts, extending the service life of the flow control valve and reducing the noise generated during operation. In addition, the avoidance groove 222 can also serve as a moving path for the shape memory alloy wire 31, guiding its movement so that the contraction and elongation of the shape memory alloy wire 31 can be converted into the translational movement of the valve core 20 along the avoidance groove 222. This ensures the straightness and stability of the shape memory alloy wire 31 during transmission, avoids driving errors caused by bending or deviation of the shape memory alloy wire 31 from the path, and thus improves the accuracy of the opening and closing action of the flow control valve.

[0053] In this application, the valve core 20 has two clearance grooves 222, which are symmetrically arranged on both sides of the valve core 20. Each clearance groove 222 corresponds to a portion of the shape memory alloy wire 31 located on either side of the valve core 20. Furthermore, the clearance grooves 222 on both sides of the valve core 20 cooperate with the mounting grooves 203 to connect the valve chambers 101 on both circumferential sides of the valve core 20, thereby improving the stability of the valve core 20's movement.

[0054] like Figure 1 and Figure 5As shown, the valve body 10 also includes a valve seat 70, a first connecting pipe 71, and a second connecting pipe 72. The valve seat 70 is fixedly connected to the valve body 10 and is located near the valve port 102. The valve seat has a first assembly port 701, a second assembly port 702, and a third assembly port 703 connected in sequence. The second assembly port 702 and the third assembly port 703 are respectively located on both sides of the valve seat 70 and are coaxially arranged. The first connecting pipe 71 is connected to the first assembly port 701, the second connecting pipe 72 is connected to the second assembly port 702, and the third assembly port 703 is connected to the valve cavity 101. The valve port 102 is located near the second assembly port 702. After the refrigerant enters the flow regulating valve from the second connecting pipe 72, it flows out from the first connecting pipe 71, or it flows in from the first connecting pipe 71 and flows out from the second connecting pipe 72.

[0055] Specifically, a balancing channel is provided on the intermediate section 22, which connects the valve chambers 101 at both ends of the valve core 20. This balancing channel can balance the pressure on the first end 201 and the second end 202 of the valve core 20, avoiding difficulties in movement or deviation of the valve core 20 due to pressure difference, so that the valve core 20 can move more smoothly and accurately, improving the control accuracy and response speed of the flow regulating valve.

[0056] like Figure 3 and Figure 4 As shown, the middle section 22 has a second stepped surface 223 near the second end 202. A connecting hole 224 is provided on the second stepped surface 223, extending to the mounting groove 203. One end of the connecting hole 224 communicates with the valve cavity 101 located on the side of the second stepped surface 223 facing the valve port 102, and the other end of the connecting hole 224 communicates with the mounting groove 203, forming a balance channel. The connecting hole 224 eliminates the pressure difference between the two ends of the valve cavity 101, thereby reducing the pressure difference between the first end 201 and the second end 202 of the valve core 20, avoiding air stagnation caused by uneven pressure, and ensuring smooth and unobstructed movement of the valve core 20. Simultaneously, the structure is simple and easy to manufacture.

[0057] like Figure 2 and Figure 3 As shown, a portion of the sidewall of the second segment 23 is machined with a cutting surface 231, making the cross-sectional dimension of the second segment 23 smaller than that of the third assembly port 703. This ensures that the third assembly port 703 is not completely blocked when the valve is closed, allowing the connecting hole 224 to communicate with the first connecting pipe 71. The cutting surface 231 and the third assembly port 703 cooperate to form a balanced channel. This design avoids the axial force generated on the valve core 20 due to sudden pressure changes inside the first connecting pipe 71, thus preventing the valve core 20 from moving and ensuring the opening and closing speed of the flow regulating valve.

[0058] The sensor 100 is a linear Hall sensor, and the sensing element is a magnetic component 51. The linear Hall sensor can sense the distance between the magnetic component 51 and the linear Hall sensor. The non-contact detection method between the linear Hall sensor and the magnetic component avoids wear, contamination, or electrical interference that may be caused by direct contact between the sensor 100 and the component, thereby improving the reliability of the detection and the service life of the sensor 100.

[0059] Specifically, the magnetic element 51 can be a permanent magnet. The linear Hall sensor can detect the Hall value, i.e., the magnetic flux, to sense the position of the magnetic element 51. When the magnetic element 51 approaches or moves away from the linear Hall sensor, its magnetic field acts on the Hall element in the linear Hall sensor, causing a change in the Hall value. The linear Hall sensor can convert the change in the Hall value into distance information between the sensor 100 and the magnetic element 51, thereby determining the movement position of the valve core 20 within the valve cavity 101. Before operation, the initial set distance between the magnetic element 51 and the sensor 100 is measured and adjusted when the valve body 10 is opened and closed. During operation, the shape memory alloy wire 31 is energized. When the wire reaches its phase change temperature, it contracts, causing the valve core 20 to move away from the valve port 102. When the sensor 100 detects that the valve core 20 has moved beyond the initial set distance, the current flowing through the shape memory alloy wire 31 is reduced. After the material temperature drops below the phase change temperature, the shape memory alloy wire 31 can move closer to the valve port 102 under the action of the elastic element 32. This micro-adjustment is repeated, and the sensor 100 provides real-time position feedback to the valve core 20. When the position of the valve core 20 reaches the initial set value, the valve opening or closing action is completed. Thus, even when the external pressure changes, the extension and retraction length of the shape memory alloy wire 31 can be quickly adjusted and controlled through the position feedback of the sensor 100, ensuring that the valve core 20 always moves to the position of the initial set value, guaranteeing the opening and closing accuracy of the flow control valve, and precisely adjusting the opening degree of the valve port 102.

[0060] like Figure 1 and Figure 4 As shown, a placement groove 52 is provided on the end face of the first end 201, and the magnetic component 51 is located in the placement groove 52. The magnetic component 51 provides a stable magnetic source for the linear Hall sensor. At the same time, the placement groove 52 can ensure the stability of the position of the magnetic component 51 during the movement of the valve core 20, avoiding the decrease in detection accuracy caused by the accidental displacement of the magnetic component 51, optimizing the detection effect of the linear Hall sensor, and improving the accuracy of position feedback.

[0061] In other embodiments, the valve core 20 is made of a permanent magnet material, and the sensor 100 can directly sense the valve core 20.

[0062] like Figure 1As shown, the valve body 10 also includes a control chamber 103, located at the end of the valve chamber 101 away from the valve port 102. A circuit board 60 is disposed within the control chamber 103, and a sensor is mounted on the circuit board 60. Both the sensor 100 and the shape memory alloy wire 31 are electrically connected to the circuit board 60. The sensor 100 on the circuit board 60 can quickly detect the position information of the valve core 20 and transmit the data to the control system or control terminal, achieving precise control of the flow regulating valve opening. Furthermore, the circuit board 60 integrates the electrical connection between the sensor 100 and the shape memory alloy wire 31, achieving compact integration of the control components. This not only optimizes the internal spatial layout of the flow regulating valve and reduces its volume but also simplifies the assembly process, facilitating inspection, maintenance, and upgrades by maintenance personnel, thus improving the ease of installation and use of the flow regulating valve. Simultaneously, the design of the control chamber 103 helps to effectively isolate electrical components from other components, improving the safety of the flow regulating valve. The sensor 100 can be positioned above or below the circuit board 60.

[0063] Specifically, the linear Hall sensor is located on the side of the valve core 20 away from the valve port 102, and the magnetic element 51 is disposed at the first end 201. The linear Hall sensor and the magnetic element 51 are arranged along the moving direction of the valve core 20. This arrangement ensures that the linear Hall sensor and the magnetic element 51 are directly opposite each other and close together, with no external obstruction between them. This direct and close arrangement ensures that the change in magnetic field strength received by the sensor 100 is more significant, thereby improving the sensitivity and accuracy of position detection. It also reduces the signal propagation distance between the magnetic element 51 and the sensor 100, thus reducing signal detection delay and improving the valve's response speed to control signals.

[0064] Specifically, the circuit board 60 is electrically connected to an external power source. The circuit board 60 is fixed to the cover 80 by fasteners. The two ends of the shape memory alloy wire 31 are electrically connected to the circuit board 60 through connecting connectors. The connecting connectors can achieve a seal between the wire and the circuit board 60.

[0065] like Figure 1 As shown, the flow control valve also includes a cover 80 and a mounting base 90. The cover 80 is located at the end of the valve body 10 away from the valve port 102, and the mounting base 90 is located at the end of the cover 80 near the valve core 20 and below the circuit board 60. The cover 80 and the mounting base 90 cooperate to form a control cavity 103. The end of the mounting base 90 near the valve port 102 has an opening that fits around the outer periphery of the first end 201, and the opening can guide and limit the movement of the valve core 20. The end of the elastic element 32 away from the valve port 102 abuts against the mounting base 90. The shape memory alloy wire 31 passes through the mounting base 90 and is electrically connected to the circuit board 60. The sensor 100 can also be located inside the mounting base 90.

[0066] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0067] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0068] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0069] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0070] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0071] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A flow regulating valve, characterized in that, The flow regulating valve includes: The valve body (10) has a valve cavity (101) and a valve port (102) that are in communication with each other, and the valve port (102) is disposed at one end of the valve cavity (101); A valve core (20) is movably disposed in the valve cavity (101). The valve core (20) has a first end (201) and a second end (202) disposed opposite to each other in the moving direction. The second end (202) is used to block or open the valve port (102). A sensing part is provided on the valve core (20). The drive assembly includes a shape memory alloy wire (31) and an elastic element (32). The length of the shape memory alloy wire (31) is adjustable. The length of the shape memory alloy wire (31) can be adjusted by changing the current of the shape memory alloy wire (31). Both the shape memory alloy wire (31) and the elastic element (32) are drivenly connected to the valve core (20). The shape memory alloy wire (31) and the elastic element (32) can respectively provide opposite forces to the valve core (20) to drive the valve core (20) to reciprocate within the valve cavity (101). A sensor (100) is disposed inside the valve body (10), and the sensor (100) cooperates with the sensing part to detect the position of the valve core (20) inside the valve cavity (101).

2. The flow regulating valve according to claim 1, characterized in that, The shape memory alloy wire (31) is located on the side of the valve core (20) away from the valve port (102). The shape memory alloy wire (31) connects the valve core (20) and the valve body (10). The shape memory alloy wire (31) is used to drive the valve core (20) to open the valve port (102). One end of the elastic element (32) abuts against the valve body (10), and the other end of the elastic element (32) abuts against the valve core (20). The elastic element (32) is used to drive the valve core (20) to block the valve port (102). The shape memory alloy wire (31) and the elastic element (32) cooperate with each other to drive the valve core (20) to block or open the valve port (102).

3. The flow regulating valve according to claim 1, characterized in that, The middle part of the shape memory alloy wire (31) passes around the valve core (20), and both ends of the shape memory alloy wire (31) extend away from the valve port (102) and are connected to the valve body (10).

4. The flow regulating valve according to claim 3, characterized in that, The flow regulating valve also includes a rotating component (40), which is rotatably mounted on the valve core (20). The rotation axis of the rotating component (40) is perpendicular to the moving direction of the valve core (20). The shape memory alloy wire (31) is wound around the rotating component (40), and the shape memory alloy wire (31) drives the valve core (20) to move through the rotating component (40).

5. The flow regulating valve according to claim 4, characterized in that, The valve core (20) has a mounting groove (203), and the rotating part (40) is disposed in the mounting groove (203).

6. The flow regulating valve according to claim 5, characterized in that, The valve core (20) has a first section (21), a middle section (22) and a second section (23) arranged sequentially along the moving direction. A step is formed between the middle section (22) and the first section (21) and the second section (23). The cross-sectional dimension of the middle section (22) along the moving direction of the valve core (20) is larger than the cross-sectional dimensions of the first section (21) and the second section (23). The first segment (21) has a first end (201), the middle segment (22) has a first stepped surface (221) near the first end (201), and one end of the elastic member (32) abuts against the first stepped surface (221); the second segment (23) has a second end (202), and the mounting groove (203) is located on the middle segment (22).

7. The flow regulating valve according to claim 6, characterized in that, An avoidance groove (222) is provided on the outer side wall of the middle section (22). The avoidance groove (222) extends from one end of the middle section (22) connected to the first section (21) to the other end, and one end of the avoidance groove (222) is connected to the mounting groove (203). Part of the shape memory alloy wire (31) is located in the avoidance groove (222).

8. The flow regulating valve according to claim 6, characterized in that, A balance channel is provided on the middle section (22), and the balance channel connects the valve chambers (101) at both ends of the valve core (20).

9. The flow regulating valve according to claim 8, characterized in that, The intermediate section (22) has a second stepped surface (223) near the second end (202). A connecting hole (224) is provided on the second stepped surface (223). The connecting hole (224) extends to the mounting groove (203). One end of the connecting hole (224) is connected to the valve cavity (101) located on the side of the second stepped surface (223) facing the valve port (102). The other end of the connecting hole (224) is connected to the mounting groove (203). The connecting hole (224) forms the balance channel.

10. The flow regulating valve according to claim 1, characterized in that, The sensor (100) is a linear Hall sensor, and the sensing part is a magnetic element (51). The linear Hall sensor can detect the distance between the magnetic element (51) and the linear Hall sensor in real time.

11. The flow regulating valve according to claim 10, characterized in that, The linear Hall sensor is located on the side of the valve core (20) away from the valve port (102), and the magnetic element (51) is disposed at the first end (201). The linear Hall sensor and the magnetic element (51) are arranged along the moving direction of the valve core (20).

12. The flow regulating valve according to claim 10, characterized in that, A placement groove (52) is provided on the end face of the first end (201), and the magnetic component (51) is located in the placement groove (52).

13. The flow regulating valve according to claim 1, characterized in that, The valve body (10) further includes a control cavity (103), which is located at the end of the valve cavity (101) away from the valve port (102). A circuit board (60) is provided in the control cavity (103), and a sensor (100) is provided on the circuit board (60). The sensor (100) and the memory alloy wire (31) are both electrically connected to the circuit board (60).

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