Flow regulating valve

Abstract

The utility model discloses a flow regulating valve, which belongs to the field of regulating valves, solves the problems that after the existing flow regulating valve is used for a long time, a diaphragm valve core can generate particles and pollute fluid, and meanwhile, the diaphragm valve core is possibly deformed to influence the performance of a valve body, and adopts the technical scheme that the flow regulating valve mainly comprises the valve body, the diaphragm valve core and a driving component, a valve port is formed in the valve body, the diaphragm valve element is provided with an adjusting part with the cross section area changing in the axial direction, a connecting piece is arranged at the output end of the driving assembly, the driving assembly drives the diaphragm valve element to move in the axial direction through the connecting piece so that the minimum opening area between the adjusting part and the valve port can be changed, and the valve body is provided with a limiting piece. The limiting piece is provided with a stopping part arranged in the valve body, the connecting piece is provided with a first limiting part, and when the connecting piece moves to the position where the first limiting part abuts against the stopping part, a minimum gap for fluid to pass through is formed between the valve port and the adjusting part. The diaphragm valve is mainly used for limiting direct contact between the diaphragm valve element and the valve port through the limiting piece.

Description

Technical Field

[0001] The utility model relates to the technical field of regulating valves, in particular to a flow regulating valve. Background Art

[0002] A flow regulating valve is a control component in a pipeline fluid transportation system. In the prior art, a flow regulating valve usually includes a valve body, a valve core, and a driving component. A first flow channel, a second flow channel, and a valve port are provided inside the valve body. The driving component drives the valve core to move, thereby changing the opening degree between the valve core and the valve port, and thus controlling the flow rate of the fluid passing through the valve port.

[0003] However, in the prior art, during the process of gradually closing the valve body, the gap between the valve core and the valve port gradually decreases. When the valve core moves to the limit position, the valve core will contact and squeeze the valve port, and the mutual extrusion between the valve core and the valve port will cause deformation between the two. Especially when the valve core and the valve body are made of resin materials, at this time, the valve core and the valve port will be more likely to creep and deform under the action of the mutual extrusion force. And for a flow regulating valve, the deformation of the valve core and the valve port will cause the opening degree between the valve core and the valve port to deviate from the expectation, thereby greatly affecting its performance. In addition, friction will occur between the valve core and the valve port, which may cause particles to be generated at the contact part of the diaphragm valve core and the valve port, and the particles will contaminate the fluid. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the problem that after long-term use of the existing flow regulating valve, the diaphragm valve core will generate particles and contaminate the fluid, and at the same time, deformation may also occur, affecting the performance of the valve body. For this reason, a flow regulating valve is provided, and the diaphragm valve core is restricted from directly contacting the valve port through a limiting member.

[0005] To solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A flow regulating valve includes:

[0007] A valve body, inside which a first flow channel, a second flow channel, and a valve port are provided, and the valve port is communicated between the first flow channel and the second flow channel;

[0008] A diaphragm valve core, which is hermetically arranged inside the valve body, and the diaphragm valve core has an adjusting part with a changing cross-sectional area in the axial direction;

[0009] A connecting member, which is connected to the diaphragm valve core;

[0010] A driving component, the driving component drives the diaphragm valve core to move axially through the connecting member, and makes the minimum opening area between the adjusting part and the valve port change, thereby changing the flow rate of the fluid passing through the valve port;

[0011] The flow regulating valve further includes:

[0012] A limiting member having a stopping portion disposed within the valve body;

[0013] The connecting member has a first limiting portion. When the connecting member moves until the first limiting portion abuts against the stopping portion, there is a minimum clearance for fluid passage between the valve port and the adjusting portion.

[0014] The beneficial effects of adopting the present utility model are as follows:

[0015] In the present utility model, the stopping portion of the limiting member abuts against the first limiting portion of the connecting member. By limiting the connecting member, the extreme position of the movement of the diaphragm valve core can be controlled, and further the minimum clearance between the diaphragm valve core and the valve port can be controlled. The cooperation between the stopping portion and the first limiting portion can prevent direct contact between the diaphragm valve core and the valve port, effectively preventing the valve port or the valve core from being deformed due to mutual extrusion between the diaphragm valve core and the valve port, thereby ensuring relatively stable performance of the valve body. At the same time, it can avoid the generation of particles due to friction or impact between the diaphragm valve core and the valve port, and avoid particulate matter from contaminating the fluid inside the valve body.

[0016] Preferably, the limiting member includes a fixing portion, and the stopping portion is connected to the fixing portion; wherein, the fixing portion is fixedly connected to the inner wall of the valve body through a fastener; alternatively, a support frame is provided inside the valve body, and the fixing portion is fixedly connected to the support frame through a fastener. By adopting the foregoing technical solution, the limiting member can be directly installed on the valve body, or a support member can be provided inside the valve body and the limiting member can be installed on the support member.

[0017] Preferably, the valve body includes a main body, a cover body and an installation cavity located between the two. A support frame is fixedly connected inside the installation cavity; the fixing portion is fixed on the support frame, and the bottom end of the fastener is higher than the top end of the main body. By adopting the foregoing technical solution, the main body and the cover body are provided in a split manner, and the fixing portion is fixed on the support frame, so that it is not necessary to fix the fixing portion on the valve body. Therefore, when designing the thickness of the valve body, it is not necessary to design the thickness of the valve body to be thick enough to ensure good connection with the fastener; and the design that the bottom end of the fastener is higher than the top end of the main body. After the main body and the cover body are separated, the fasteners can be exposed to the outside, which is convenient for installing or disassembling the fasteners, and is beneficial to reducing the installation and disassembly difficulty of the fixing portion; in addition, the bottom end of the fastener is higher than the top end of the main body, that is, the position where the fastener is located is higher than the top end of the main body, which can effectively prevent the main body from hindering the installation and disassembly of the fastener, and further reduce the installation and disassembly difficulty of the fastener.

[0018] Preferably, the limiting member further includes a stepless adjustment hole provided on the fixing member, and the stepless adjustment hole is used to adjust the height of the stopping portion relative to the valve body. By adopting the foregoing technical solution, when there is an error in installation or valve body processing, the height of the stopping portion can be adjusted steplessly through the stepless adjustment hole to make up for the error and make the stopping portion reach the specified height.

[0019] Preferably, there are two stop portions, which are respectively located on both sides of the central axis of the connecting member. The connecting member has two first limiting portions, and the two stop portions can respectively abut against the two first limiting portions. With the foregoing technical solution, by respectively abutting the two first limiting portions against the two stop portions, the force on the connecting member can be made more uniform, avoiding the situation where when the abutting position between the first limiting member and the stop portion is only on one side of the connecting member, the force is uneven and the acting force between the two is too large, resulting in easy damage to the first limiting member or the stop portion, or the connecting member itself is not in balance and the connecting member is prone to skew.

[0020] Preferably, the connecting member has a limiting surface, and the stop portion can limit the circumferential rotation of the connecting member by abutting against the limiting surface. With the foregoing technical solution, the cooperation between the stop portion and the limiting surface can effectively limit the circumferential rotation of the connecting member, so that the connecting member maintains a stable axial movement.

[0021] Preferably, the connecting member further has a second limiting portion located on the side of the stop portion away from the first limiting portion, for limiting the axial movement distance of the connecting member. With the foregoing technical solution, the cooperation of the second limiting portion, the first limiting portion and the stop portion can limit the axial movement stroke of the diaphragm valve core, avoiding the diaphragm of the diaphragm valve core being overstretched due to too large an axial movement distance, ensuring that the axial movement distance of the diaphragm valve core remains within the deformation range of the diaphragm, playing a protective role for the diaphragm valve core, helping to extend the service life of the diaphragm valve core, and keeping the sealing fit between the diaphragm valve core and the valve body stable.

[0022] Preferably, the driving assembly includes a threaded driving structure that cooperates with the connecting member. A spring is sleeved outside the connecting member, and both ends of the spring respectively abut against the connecting member and the valve body. With the foregoing technical solution, the spring can apply an elastic force to the connecting member to avoid variable gaps between the threads, thereby avoiding errors in the movement height of the connecting member and the valve core during the actual adjustment process due to the influence of the thread gaps in the threaded driving structure, thereby improving the adjustment accuracy of the valve body; and the spring can also reduce the possibility of loosening between the connecting member and the threaded driving mechanism, avoiding the phenomenon that the connecting member loosens and the position shifts due to vibration and the threaded driving structure, and improving the connection stability between the connecting member and the threaded driving structure.

[0023] Preferably, the main body has an axially extending positioning platform, and the support frame is sleeved outside the positioning platform. With the foregoing technical solution, the positioning platform can position the installation position of the support frame, realize the rapid positioning of the support frame, and make the installation of the support frame more rapid and convenient.

[0024] Preferably, a sensor is provided inside the valve body. The driving assembly includes a motor electrically connected to the sensor. The motor can drive the connecting member to move axially through a threaded structure. An induction post is provided on the outside of the connecting member, and a detection port for detecting the induction post is provided on the sensor. When the connecting member descends to a position where the first limiting portion abuts against the stopping portion or before the first limiting portion abuts against the stopping portion, the detection port in the sensor can sense the induction post and cause the motor to stop working. With the foregoing technical solution, when the stopping portion abuts against the first limiting portion, the detection port senses the induction post, so that after the sensor transmits the corresponding signal to the motor, the motor will stop working, thereby preventing the motor from driving the connecting member to move, resulting in a direct impact between the first limiting portion on the connecting member and the stopping portion, which may easily damage the structure.

[0025] Other features and advantages of the present utility model will be disclosed in detail in the following specific embodiments and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present utility model will be further described below with reference to the drawings:

[0027] Figure 1 is a schematic structural diagram of Embodiment 1;

[0028] Figure 2 is a cross-sectional view of Embodiment 1;

[0029] Figure 3 is a schematic structural diagram of the main body and the driving assembly in Embodiment 1;

[0030] Figure 4 is a schematic structural diagram of the support frame and the connecting member in Embodiment 1;

[0031] Figure 5 is a schematic structural diagram of the connecting member and the limiting member in Embodiment 1;

[0032] Figure 6 is a schematic structural diagram of the connecting member and the sensor in Embodiment 1;

[0033] Figure 7 is a cross-sectional structural schematic diagram of the diaphragm valve head and the valve port in Embodiment 2;

[0034] Figure 8 is a three-dimensional cross-sectional structural schematic diagram of the limiting member in Embodiment 3.

[0035] Reference numerals: 1 valve body, 11 cover body, 12 main body, 13 valve port, 14 support frame, 141 positioning hole, 15 installation cavity, 21 drive motor, 211 threaded drive structure, 22 connecting member, 221 first limiting portion, 222 second limiting portion, 223 limiting surface, 224 sensing post, 225 boss, 226 threaded hole, 23 spring, 3 limiting member, 31 stopping portion, 32 fixing portion, 321 stepless adjustment hole, 33 fastener, 4 sensor, 41 detection portion, 411 detection port, 5 diaphragm valve head, 51 adjustment portion. Detailed implementation manners

[0036] The technical solutions of the embodiments of the present invention will be explained and described below with reference to the accompanying drawings of the embodiments of the present invention. However, the following embodiments are only the preferred embodiments of the present invention, not all of them. Based on the embodiments in the implementation manners, other embodiments obtained by those skilled in the art without creative efforts all fall within the protection scope of the present invention.

[0037] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom"

[0038] "Inner", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0039] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise clearly defined.

[0040] In the present invention, unless otherwise clearly defined and limited, the terms "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0041] Embodiment 1

[0042] As Figures 1 to 6 shown, this embodiment demonstrates a flow control valve, which includes a valve body 1, a diaphragm valve core, and a driving assembly. Inside the valve body 1, there are a first flow channel, a second flow channel, and a valve port 13. The valve port 13 is communicated between the first flow channel and the second flow channel. The diaphragm valve core is sealingly arranged inside the valve body 1, and the diaphragm valve core has an adjusting portion 51 whose cross-sectional area changes axially. The driving assembly includes a driving motor 21 and a connecting member 22 connected to the diaphragm valve core. The driving assembly drives the diaphragm valve core to move axially through the connecting member 22, and makes the minimum opening area between the adjusting portion 51 and the valve port 13 change, thereby changing the flow rate of the fluid passing through the valve port 13. Additionally, a limiting member 3 is also provided inside the valve body 1. The limiting member 3 has a stopping portion 31 arranged inside the valve body 1, and the connecting member 22 has a first limiting portion 221. When the connecting member 22 moves to the point where the first limiting portion 221 abuts against the stopping portion 31, there is a minimum gap for the fluid to pass through between the valve port 13 and the adjusting portion 51.

[0043] In this embodiment, the stopping portion 31 of the limiting member 3 abuts against the first limiting portion 221 of the connecting member 22. By limiting the connecting member 22, the maximum movement distance of the diaphragm valve core can be controlled, and then the minimum gap between the diaphragm valve core and the valve port 13 can be controlled. The cooperation between the stopping portion 31 and the first limiting portion 221 can prevent direct contact between the diaphragm valve core and the valve port 13, effectively preventing the diaphragm valve core from generating particles or deformation due to friction or impact, which helps to improve the service life of the diaphragm valve core. At the same time, it can also keep the stable cooperation between the diaphragm valve core and the valve port 13, enabling the valve body 1 to maintain accurate adjustment performance.

[0044] As Figure 2 and Figure 3 shown, in this embodiment, the valve body 1 includes a main body 12 and a cover body 11. An installation cavity 15 is formed by surrounding between the main body 12 and the cover body 11. A support frame 14 is fixedly connected inside the installation cavity 15. The bottom end of the support frame 14 is fixed to the main body 12, the top end of the support frame 14 is fixedly connected to the driving motor 21, and the support frame 14 is provided with an avoidance hole for the output end of the driving assembly to extend into. The connecting member 22 is inside the support frame 14.

[0045] The limiting member 3 includes a fixing portion 32. The fixing portion 32 is fixedly connected to the support frame 14 through a fastener 33. Fixing the fixing portion 32 to the support frame 14 through the fastener 33 can provide stable support for the stopping portion 31. Moreover, the setting of the support frame 14 can also facilitate the installation of the fixing portion 32 and avoid the structure in the valve body 1 from affecting the installation of the fastener 33.

[0046] As Figure 2 and Figure 5As shown, in this embodiment, the support frame 14 is provided with fixing holes, and the limiting member 3 further includes a stepless adjustment hole 321 provided on the fixing member. The fastener 33 is a bolt. The fastener 33 passes through the stepless adjustment hole 321 and is threadedly connected to the fixing hole, thereby realizing the fixed connection between the limiting member 3 and the support frame 14.

[0047] As Figure 5 shown, in this embodiment, the stepless adjustment hole 321 is an oblong hole, and the length direction of the stepless adjustment hole 321 is distributed along the axial direction of the connecting member 22. When there is an error in the installation or the valve body 1 is processed, the fastener 33 can be loosened to release the fixed connection between the fixing portion 32 and the support frame 14, so that the fixing portion 32 can move relative to the support frame 14 along the length direction of the stepless adjustment hole 321, and then the height of the stopping portion 31 can be adjusted steplessly to make up for the error. When the stopping portion 31 reaches the specified height, the fixing portion 32 and the support frame 14 are fixedly connected again through the fastener 33, and then the height adjustment of the stopping portion 31 is completed. For the convenience of installation and disassembly of the fastener 33, in this embodiment, the bottom end of the fastener 33 is higher than the top end of the main body 12. When the height position of the stopping portion 31 needs to be adjusted, the cover body 11 and the main body 12 need to be separated to expose the support frame 14, and the limiting member 3 is fixed to the support frame 14 through the fastener 33. It is also possible that the end of the fastener 33 is directly exposed outside, which is convenient for maintenance personnel to operate on the fastener 33, convenient for the installation or disassembly of the fastener 33, and is beneficial to reducing the installation and disassembly difficulty of the fixing portion 32.

[0048] It should be noted that in other embodiments, the fixing portion 32 of the limiting member 3 can also be fixedly connected to the inner wall of the valve body 1 through the fastener 33; in addition, in other embodiments, the stepless adjustment hole 321 can also be provided on the support frame 14.

[0049] As Figure 2 and Figure 5 shown, in this embodiment, the limiting member 3 is provided with two stopping portions 31, and the two stopping portions 31 are respectively on both sides of the central axis of the connecting member 22. Correspondingly, the connecting member 22 has two first limiting portions 221, and the two first limiting portions 221 are symmetrically distributed on both sides of the connecting member 22 and extend radially outward of the connecting member 22. In this embodiment, the connecting member 22 abuts against the two stopping portions 31 through the two first limiting portions 221 respectively, which can make the force on the connecting member 22 more uniform, avoid the connecting member 22 from being skewed, and at the same time can also avoid the structure from being damaged due to excessive force on one side of the connecting member 22.

[0050] In addition, the stopping portion 31 is located below the first limiting portion 221. The stopping portion 31 cooperates with the first limiting portion 221 to limit the descending distance of the connecting member 22. Correspondingly, in this embodiment, the adjusting portion 51 of the diaphragm valve head 5 is located above the valve port 13. During the process that the driving motor 21 drives the diaphragm valve head 5 to descend through the connecting member 22, the adjusting portion 51 of the diaphragm valve head 5 gradually descends and approaches the valve port 13, thereby reducing the opening area between the adjusting portion 51 and the valve port 13. When the top surface of the stopping portion 31 abuts against the bottom surface of the first limiting portion 221, the diaphragm valve head 5 descends to the limit position, and the minimum gap is reached between the adjusting portion 51 and the valve port 13, and this minimum gap allows the fluid to pass through.

[0051] It should be noted that the function of this flow regulating valve is to regulate the flow rate through the valve body, rather than the valve body serving as a function of truncating the flow path.

[0052] As Figure 5 shown, in this embodiment, a limiting surface 223 is provided on the outer peripheral side of the connecting member 22. The limiting surface 223 is located below the first limiting portion 221. The stopping portion 31 extends to the lower side of the first limiting portion 221 and abuts against the limiting surface 223. In this embodiment, limiting surfaces 223 are provided on both sides of the connecting member 22, and both of the two limiting surfaces 223 are located between the two stopping portions 31. The two stopping portions 31 clamp the connecting member 22, thereby restricting the circumferential rotation of the connecting member 22. In this embodiment, the output end of the driving motor 21 is threadedly connected to the connecting member 22. The stopping portion 31 and the limiting surface 223 cooperate to restrict the circumferential rotation of the connecting member 22, and thus the rotational motion of the output end can be converted into the axial motion of the connecting member 22, enabling the connecting member 22 to drive the diaphragm valve head 5 to move up and down smoothly.

[0053] It should be noted that in this embodiment, the stopping portion 31 and the limiting surface 223 do not completely fit together. There is a small gap between the stopping portion 31 and the limiting surface 223 to prevent direct contact between the stopping portion 31 and the limiting surface 223, which may cause excessive resistance to the relative motion between the two and affect the up and down movement of the connecting member 22. Specifically, having a gap between the stopping portion 31 and the limiting surface 223 can reduce the contact area when the stopping portion 31 abuts against the limiting surface 223, reduce the frictional force suffered by the connecting member 22 and the stopping portion 31 during axial movement, and reduce the possibility of damage to the limiting surface 223 and the stopping portion 31 due to long-term friction, which helps to extend the service life of the stopping portion 31 and the limiting surface 223.

[0054] In addition, the overall limiting surface 223 is a flat surface. The length direction of the stopping portion 31 is parallel to the limiting surface 223. During the process of the driving motor 21 controlling the axial movement of the connecting member 22, if the driving motor 21 drives the connecting member 22 to deflect through the torsional force between the threaded structures, the limiting surface 223 in the connecting member 22 will abut against the stopping portion 31. At this time, the stopping portion 31 and the limiting surface 223 are in abutting cooperation, thereby restricting the circumferential rotation of the connecting member 22 and converting the rotational movement of the driving motor 21 into the axial movement of the connecting member 22, so as to realize the axial movement of the diaphragm valve head 5.

[0055] Of course, it can be understood that in other embodiments, the stopping portion 31 and the limiting surface 223 can also be kept in close fit, thereby completely restricting the circumferential rotation of the connecting member 22. In addition, in other embodiments, the limiting surface 223 can also be provided with a plurality of grooves, and the limiting surface 223 can also reduce the contact area between the limiting surface 223 and the stopping portion 31 through the grooves.

[0056] As Figure 5 shown, in this embodiment, the connecting member 22 further has a second limiting portion 222 located on the side of the stopping portion 31 away from the first limiting portion 221, so as to limit the axial movement distance of the connecting member 22. The second limiting portion 222 is located below the stopping portion 31. The stopping portion 31 and the second limiting portion 222 cooperate to limit the rising distance of the connecting member 22. The second limiting portion 222 and the first limiting portion 221 cooperate to limit the stroke of the axial movement of the diaphragm valve core, which can prevent the diaphragm of the diaphragm valve core from being overstretched due to the too large axial movement distance, ensure that the axial movement distance of the diaphragm valve core is kept within the deformation range of the diaphragm, play a protective role for the diaphragm valve core, help to extend the service life of the diaphragm valve core, and keep the sealing fit between the diaphragm valve core and the valve body 1 stable.

[0057] As Figure 5As shown, the bottom end surface of the first limiting portion 221 and the top end surface of the second limiting portion 222 are both planar structures. The entire positioning portion 31 is a columnar structure, and the top end surface and the bottom end surface of the positioning portion 31 are also both planar structures. Moreover, the top end surface of the positioning portion 31 is parallel to the bottom end surface of the first limiting portion 221, and the bottom end surface of the positioning portion 31 is parallel to the top end surface of the second limiting portion 222. Using planar structures can effectively increase the contact area between the positioning portion 31 and the first limiting portion 221, as well as between the positioning portion 31 and the second limiting portion 222, and can disperse the acting forces received by the three components of the positioning portion 31, the first limiting portion 221, and the second limiting portion 222, making the force on these three components more uniform. Furthermore, it can reduce the possibility of damage to the positioning portion 31, the first limiting portion 221, and the second limiting portion 222, which helps to improve the matching stability between the connecting member 22 and the limiting member 3. In addition, during the installation process of the limiting member 3, through the aforementioned planar structures, it can ensure better fitting between the positioning portion 31 and the first limiting portion 221 to ensure that the abutting surfaces between the two are parallel, and avoid the situation where the abutting surface between the positioning portion 31 and the first limiting portion 221 is inclined after installation.

[0058] Of course, it can be understood that in other embodiments, the positioning portion 31 can also be a cylindrical structure.

[0059] As Figure 2 and Figure 4 As shown, in this embodiment, the main body 12 is provided with a through hole for the connecting member 22 to pass through. The top end of the through hole is communicated with the installation cavity 15, and the peripheral side wall of the through hole extends along the axial direction of the connecting member 22 to form a positioning platform. The bottom of the support frame 14 is provided with a positioning hole 141 that cooperates with the annular positioning platform. The support frame 14 is sleeved outside the positioning platform through the positioning hole 141. During the installation process of the installation bracket, first, align the positioning hole 141 at the bottom end of the support frame 14 with the positioning platform, and sleeve the positioning hole 141 outside the positioning platform. The cooperation between the positioning platform and the positioning hole 141 can limit the support frame 14 to form radial limitation, and then position the installation position of the support frame 14, enabling rapid positioning of the support frame 14 and making the installation of the support frame 14 more rapid and convenient.

[0060] In this embodiment, the outer side of the positioning table is integrally circular. Therefore, after the positioning table is engaged with the positioning hole 141, the support frame 14 can rotate circumferentially along the positioning table. When the mounting holes at the bottom of the support frame 14 are aligned with the mounting holes of the main body 12, the support frame 14 and the main body 12 can be fixedly connected by the fastener 33. Of course, it can be understood that in other embodiments, the outer side of the positioning table can also be an anti-rotation structure, and the corresponding positioning hole 141 can also be an anti-rotation hole. For example, the outer periphery of the positioning table is a polygonal structure or other non-circular special-shaped structures. The positioning hole fits with the positioning table to ensure that the two cannot rotate relative to each other, thereby realizing the rapid positioning of the support frame 14. Or in other embodiments, there are multiple positioning tables. After the positioning holes are matched with the positioning tables, the positioning of the positioning hole 141 can also be achieved.

[0061] As Figure 2 shown, in this embodiment, the driving assembly includes a threaded driving structure 211 that cooperates with the connecting member 22. The threaded driving structure 211 is a screw rod with threads at its end. A threaded hole 226 is provided at the upper end of the connecting member 22. The screw rod is threadedly connected to the threaded hole 226, thereby realizing the transmission connection between the driving motor 21 and the connecting member 22. A spring 3 is sleeved outside the connecting member 22. The two ends of the spring 3 respectively abut against the connecting member 22 and the top end of the positioning table. The spring 3 gives the connecting member 22 a tendency to move upward, enabling the connecting member 22 to be stably connected to the threaded driving structure 211, reducing the gap between the connecting member 22 and the threaded driving structure 211. Thus, during the motor drive process, the error in the movement distance of the connecting member 22 caused by the thread clearance can be avoided, thereby ensuring the valve body adjustment accuracy. And the spring 3 can also reduce the possibility of loosening between the connecting member 22 and the threaded driving mechanism, avoiding the phenomenon that the connecting member 22 loosens and its position shifts due to vibration and contacting the threaded driving structure 211, and improving the connection stability between the connecting member 22 and the threaded driving structure 211.

[0062] As Figure 4 and Figure 6As shown in the figure, on the side of the support frame 14 away from the limiting member 3 in this embodiment, a sensor 4 is fixedly connected. A control component is provided in the valve body 1, and the control component is electrically connected to the sensor 4 and the driving motor 21 respectively. On the side of the connecting member 22 facing the sensor 4, there is a boss 225. An induction post 224 extending outward is provided on the lower side of the boss 225. The sensor 4 has two detection parts 41 extending towards the connecting member 22. The ends of the two detection parts 41 extend to both sides of the boss 225 respectively. A detection port 411 for detecting the induction post 224 is formed between the two detection parts 41. When the connecting member 22 moves downward, the first limit and the detection port 411 senses the induction post 224, and the control component is used to control the driving motor to stop working. At this time, the stop part 31 and the first limit part 221 just come into contact or have not been released, avoiding the first limit part 221 directly hitting the stop part 31 with a large impact force driven by the driving click 21, which may easily damage the structure.

[0063] Embodiment 2

[0064] The difference from Embodiment 1 is that: as Figure 7 shown, the first limit part 221 is located below the stop part 31. The stop part 31 and the first limit part 221 cooperate to limit the rising distance of the connecting member 22. Correspondingly, in this embodiment, the adjusting part 51 of the diaphragm valve head 5 is located below the valve port 13. During the process of the driving motor 21 driving the diaphragm valve head 5 to rise through the connecting member 22, the adjusting part 51 of the diaphragm valve head 5 gradually rises and approaches the valve port 13, thereby reducing the opening area between the adjusting part 51 and the valve port 13. When the bottom end surface of the stop part 31 abuts against the top end surface of the first limit part 221, the diaphragm valve head 5 rises to the limit position, and the minimum gap is formed between the adjusting part 51 and the valve port 13, and this minimum gap can allow the fluid to pass through to avoid the adjusting part 51 and the valve port 13 from abutting against each other.

[0065] Embodiment 3

[0066] The difference from Embodiment 1 is that: the stepless adjustment hole 321 is arranged on the fixing part 32, and the relative position between the stop part 31 and the fixing part 32 is changed through the stepless adjustment hole 321.

[0067] As Figure 8 shown, one side of the fixing part 32 abuts against the stop part 31, and a bolt structure is arranged on the other side. The bolt structure extends into the stepless adjustment hole 321 and is threadedly connected to the stop part 31. When the bolt structure is tightened, the relative fixation between the stop part 31 and the fixing part 32 can be realized. When the bolt structure is loosened, the relative position between the stop part 31 and the fixing part 32 can be changed, so as to realize the change of the height of the stop part 31.

[0068] The above are only the specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Those skilled in the art should understand that the present utility model includes but is not limited to the content described in the drawings and the above specific embodiments. Any modification that does not deviate from the functional and structural principles of the present utility model will be included in the scope of the claims.

Claims

1. A flow control valve, comprising: A valve body, wherein a first flow channel, a second flow channel and a valve port are provided inside the valve body, and the valve port is connected between the first flow channel and the second flow channel; A diaphragm valve core is sealed and arranged inside the valve body, and the diaphragm valve core has an adjusting portion whose cross-sectional area changes in the axial direction; A connecting piece, connected to the diaphragm valve core; A drive assembly, wherein the drive assembly drives the diaphragm valve core to move axially through the connecting piece, and changes the minimum opening area between the regulating part and the valve port, thereby changing the flow rate of the fluid passing through the valve port; Characterized in that the flow regulating valve also includes: A stopper having a stop portion disposed in the valve body; The connecting member has a first limiting portion. When the connecting member moves to the point where the first limiting portion abuts against the stop portion, a minimum gap for fluid to pass through exists between the valve port and the regulating portion.

2. A flow control valve according to claim 1, characterized in that: The position-limiting member comprises a fixing portion, and the stop portion is connected to the fixing portion; wherein the fixing portion is fixedly connected to the inner wall of the valve body via a fastener; or a support frame is provided in the valve body, and the fixing portion is fixedly connected to the support frame via a fastener.

3. A flow control valve according to claim 2, characterized in that: The valve body comprises a main body, a cover body and an installation cavity located therebetween, and a support frame is fixedly connected in the installation cavity; the fixing portion is fixed on the support frame, and the bottom end of the fastener is higher than the top end of the main body.

4. A flow control valve according to claim 2, characterized in that: The limiting member further comprises a stepless adjustment hole arranged on the fixing member, and the stepless adjustment hole is used to adjust the height of the stop portion relative to the valve body.

5. A flow control valve according to claim 1, characterized in that: The stop parts are provided with two, and the two stop parts are respectively located on both sides of the central axis of the connecting member. The connecting member has two first limiting parts, and the two stop parts can respectively abut against the two first limiting parts.

6. A flow control valve according to claim 1 or 5, characterized in that: The connecting member has a limiting surface, and the stop portion can limit the circumferential rotation of the connecting member by abutting against the limiting surface.

7. A flow control valve according to claim 5, characterized in that: The connecting member also has a second limiting portion located on the side of the stop portion away from the first limiting portion, so as to limit the axial movement distance of the connecting member.

8. A flow control valve according to claim 1, characterized in that: The driving assembly comprises a threaded driving structure matched with the connecting piece. A spring is sleeved on the outer side of the connecting piece. Two ends of the spring respectively abut against the connecting piece and the valve body.

9. A flow control valve according to claim 3, characterized in that: The main body is provided with an axially extending positioning platform, and the supporting frame is sleeved on the outer side of the positioning platform.

10. A flow control valve according to claim 1, characterized in that: A sensor is provided in the valve body, and the driving assembly includes a motor electrically connected to the sensor. The motor can drive the connecting piece to move axially through a threaded structure. A sensing column is provided on the outer side of the connecting piece, and a detection port for detecting the sensing column is provided on the sensor. When the connecting piece descends to the point where the first limit portion abuts against the stop portion or before the first limit portion abuts against the stop portion, the detection port in the sensor can sense the sensing column and stop the motor.

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