A direct-acting proportional valve

Abstract

This application relates to the field of fluid control, and in particular to a direct-acting proportional valve, including a drive mechanism and a pressure regulating mechanism. The pressure regulating mechanism includes a valve body, a valve core, and a valve sleeve. The valve core includes an upper valve core and a lower valve core. The drive mechanism drives the upper valve core to move downward to block the through hole of the lower valve core. The outer wall of the lower valve core is provided with a first sealing structure, and the valve sleeve is provided with a second sealing structure. The first sealing structure movably abuts against the second sealing structure, and the two form an adjustable pressure regulating channel. From top to bottom, an outlet chamber, an inlet chamber, and a guide groove are formed between the valve sleeve and the lower valve core. The guide groove is provided with an axially extendable first elastic element. The bottom of the first elastic element is connected to the bottom of the guide groove, and its top is connected to the bottom of the lower valve core. The outlet chamber and the guide groove are sealed together. This proportional valve can improve the stability and accuracy of the valve core during operation, thereby improving the accuracy of the proportional valve in controlling the proportion of the air output.

Description

Technical Field

[0001] This application relates to the field of fluid control, and in particular to a direct-acting proportional valve. Background Technology

[0002] With the continuous improvement of industrial automation, the demand for precise control of fluid flow is also increasing. Proportional valves can be used to control the flow of liquids and gases, converting input electrical signals into force or displacement proportionally, thereby enabling continuous control of key parameters such as pressure and flow rate. They are widely used in industrial settings, such as machine tools, injection molding machines, and metallurgical equipment, significantly improving equipment automation and processing accuracy. Furthermore, in high-end fields such as aerospace and automotive manufacturing, the precise control of proportional valves plays a crucial role in ensuring product quality and performance, driving industrial production towards higher efficiency and precision. Currently available pneumatic proportional valves typically consist of a valve body and a proportional electromagnet mounted on the valve body. A valve sleeve is lined the inner wall of the valve body, and an inlet chamber, an outlet chamber, and a guide groove are located between the valve sleeve and the inner wall of the valve body. The valve body has an inlet port and an outlet port corresponding to the inlet and outlet chambers, respectively. The inlet port communicates with the inlet chamber, and the outlet port, outlet chamber, and guide groove are also connected. The guide groove is located at the bottom of the valve sleeve. A valve core, comprising an upper valve core and a lower valve core, is located inside the valve sleeve. The upper end of the upper valve core is connected to the proportional electromagnet. When the proportional electromagnet operates, it drives the upper valve core downwards to block the through hole in the middle of the lower valve core. The lower valve core moves downwards to block the air pressure regulating channel between the inlet and outlet chambers. By adjusting the movement distance of the valve core, the size of the air pressure regulating channel is adjusted, thereby controlling the fluid flow rate. A return spring is located at the bottom of the lower valve core to drive it upwards. Gas enters through the inlet, passes through the pressure regulating channel into the guide groove, and finally flows out through the outlet chamber. A pressure detection system monitors and regulates the pressure within the internal cavity. However, existing pneumatic proportional valves still have significant drawbacks in practical applications, primarily in their inaccurate control of the output gas ratio, making them unsuitable for situations with large gas flows. When the flow is large, the high-speed gas flow into the guide groove can cause the return spring to wobble, leading to easy movement of the lower valve core. This, in turn, introduces errors in the adjustment accuracy of the pressure regulating channel between the inlet and outlet chambers, making it impossible to precisely control the output gas pressure ratio. Furthermore, their structural design is unsuitable for industrial scenarios requiring high precision in output gas pressure control. Utility Model Content

[0003] In order to improve the stability and accuracy of the valve core during operation, thereby improving the accuracy of the proportional valve in controlling the output air pressure ratio, this application provides a direct-acting proportional valve.

[0004] This application provides a direct-acting proportional valve, including a drive mechanism and a pressure regulating mechanism. The pressure regulating mechanism includes a valve body, a valve core, and a valve sleeve. The valve body is provided with an air inlet and an air outlet. The valve core includes an upper valve core and a lower valve core. The drive mechanism drives the upper valve core to move downward to block the through hole of the lower valve core. The outer wall of the lower valve core is provided with a first sealing structure. The valve sleeve is provided with a second sealing structure. The first sealing structure movably abuts against the second sealing structure. An adjustable pressure regulating channel is formed between the first sealing structure and the second sealing structure. An air outlet chamber, an air inlet chamber, and a guide groove are formed sequentially from top to bottom between the valve sleeve and the lower valve core. The bottom of the lower valve core moves axially within the guide groove. The guide groove is provided with a first elastic element that extends and retracts axially. The bottom of the first elastic element is connected to the bottom of the guide groove, and its top is connected to the bottom of the lower valve core. The air outlet chamber and the guide groove are sealed together. By adopting the above technical solution, the drive mechanism drives the upper valve core to move downward and block the through hole of the lower valve core. The first sealing structure on the outer wall of the lower valve core and the second sealing structure of the valve sleeve movably abut against each other to form an adjustable air pressure regulating channel. When gas enters the intake chamber from the lower inlet, the gas flows upward and reaches the upper outlet chamber through the air pressure regulating channel. The size of the air pressure regulating channel can be adjusted according to the movement of the lower valve core, thereby precisely controlling the gas output and adjusting the air pressure ratio. Because the bottom of the lower valve core moves axially within the guide groove, and the guide groove is equipped with a first elastic element that extends axially, with its bottom connected to the bottom of the guide groove and its top connected to the bottom of the lower valve core, the guide groove provides a stable axial movement path for the lower valve core when gas is introduced at high speed, preventing the lower valve core from shaking or moving arbitrarily. Furthermore, the gas outlet chamber and the guide groove are sealed together, so even with a large gas flow, the gas will not affect the state of the first elastic element or the movement of the valve core. The movement of the valve core throughout the process is controlled only by the drive mechanism and is not affected by the inflowing gas, thereby improving the accuracy of the proportional valve in controlling gas pressure and making it suitable for industrial scenarios with high requirements for gas pressure control accuracy. Preferably, the bottom of the lower valve core is provided with a guide post, and the middle of the guide post is provided with a mounting cavity communicating with the through hole. The bottom of the first elastic element is connected to the bottom of the guide groove, and its top extends into the mounting cavity and abuts against the top wall of the mounting cavity. The outer wall of the guide post is sealed to the side wall of the guide groove. By adopting the above technical solution, a guide post is set at the bottom of the lower valve core, and an installation cavity communicating with the through hole is set in the middle of the guide post. The bottom of the first elastic element is connected to the bottom of the guide groove, and the top extends into the installation cavity and abuts against the top wall of the installation cavity. The outer wall of the guide post is sealed to the side wall of the guide groove.When gas is introduced into the guide groove at high speed, the guide post and the side wall of the guide groove are sealed together, guiding the movement of the lower valve core and limiting its sway range. This makes the first elastic element more stable during extension and contraction, preventing unnecessary movement of the lower valve core due to swaying of the first elastic element caused by high-speed gas impact. This ensures the adjustment accuracy of the gas pressure regulating channel between the inlet and outlet chambers, improving the precision of the direct-acting proportional valve in controlling the outlet gas pressure ratio and enabling it to better adapt to situations with large gas flow. Preferably, the inner wall of the valve sleeve is provided with a first sealing ring, which contacts the outer wall of the guide post. By adopting the above technical solution, the inner wall of the valve sleeve is provided with a first sealing ring that contacts the outer wall of the guide post, allowing a sealed connection between the outer wall of the guide post and the side wall of the guide groove. Because the first sealing ring fills the gap between the outer wall of the guide post and the side wall of the guide groove, it prevents gas leakage at this gap, thus ensuring the sealing of the guide groove and preventing the gas in the inlet chamber from affecting the movement accuracy of the first elastic element in the guide groove, thereby improving the control accuracy of the gas pressure by the direct-acting proportional valve. Preferably, the first sealing structure includes a conical adjustment section and a sealing section from top to bottom. The diameter of the conical adjustment section gradually increases from top to bottom. The sealing section is connected to the large-diameter end of the conical adjustment section. The diameter of the sealing section is larger than the diameter of the conical adjustment section, and the top of the sealing section abuts against the second sealing structure. By adopting the above technical solution, the first sealing structure includes a conical adjustment section and a blocking section from top to bottom, with the diameter of the conical adjustment section gradually increasing from top to bottom. The blocking section is connected to the large-diameter end of the conical adjustment section, and the diameter of the blocking section is larger than that of the conical adjustment section. When the top of the blocking section abuts against the second sealing structure, it blocks the air pressure regulating channel. When the blocking section moves downward, due to the gradually increasing diameter of the conical adjustment section, the cross-sectional area of ​​the air pressure regulating channel formed between the first and second sealing structures gradually increases. According to the principle that gas flow rate is proportional to cross-sectional area, the greater the gas flow rate, the higher the air pressure in the outlet chamber, thereby gradually increasing the outlet air pressure ratio of the air pressure regulating channel, thus achieving effective regulation of the air pressure ratio. Preferably, the second sealing structure has an abutting protrusion on the side facing the blocking section, and the abutting protrusion movably abuts against the top of the blocking section. By adopting the above technical solution, when the blocking section moves upward, the abutting protrusion of the second sealing structure will gradually approach the top of the blocking section. As the movement continues, the two parts come into contact, blocking the connection between the inlet and outlet chambers, thus sealing the pressure regulation channel and allowing for precise control of gas flow and flow. Preferably, an elastic sealing ring is embedded at the top of the sealing section, and the abutting protrusion movably abuts against the elastic sealing ring. By adopting the above technical solution, because the elastic sealing ring can deform, the abutting protrusion fits tightly against the surface of the elastic sealing ring, resulting in a better sealing effect on the pressure regulation channel.Preferably, the valve body is provided with an exhaust port, and an exhaust chamber communicating with the exhaust port is also provided between the valve sleeve and the lower valve core. The exhaust chamber is located above the outlet chamber, and the top of the lower valve core extends into the exhaust chamber. A second elastic element is provided in the exhaust chamber, and the second elastic element is sleeved on the top of the lower valve core. A valve core sealing element is provided on the outer wall of the upper valve core. The bottom of the second elastic element is connected to the bottom wall of the exhaust chamber, and its top is connected to the valve core sealing element. The valve sleeve is provided with a second sealing ring that contacts the outer wall of the lower valve core. The second sealing ring is located between the exhaust chamber and the outlet chamber. By adopting the above technical solution, the valve body is provided with an exhaust port, and an exhaust chamber communicating with the exhaust port is provided between the valve sleeve and the lower valve core. The exhaust chamber is located above the outlet chamber. When gas flows in the valve body, excess gas can be discharged through the exhaust port, regulating the gas pressure in the valve body and preventing gas from accumulating in the valve body and generating excessive pressure that would affect the normal operation of the proportional valve. The lower valve core extends into the exhaust chamber at its top. A second elastic element is sleeved on the top of the lower valve core within the exhaust chamber. A valve core sealing element is provided on the outer wall of the upper valve core. The bottom of the second elastic element is connected to the bottom wall of the exhaust chamber, and its top is connected to the valve core sealing element. When the valve core moves, the upper valve core compresses the second elastic element until it contacts the lower valve core. When the upper valve core moves upward, the deformation restoring force of the second elastic element assists in separating the upper and lower valve cores. Furthermore, the second elastic element acts as a buffer for the upper and lower valve cores, reducing impact and vibration during valve core movement and improving the stability and reliability of valve core movement. A second sealing ring is provided on the valve sleeve, contacting the outer wall of the lower valve core and located between the exhaust chamber and the outlet chamber. This prevents gas leakage from the outlet chamber to the exhaust chamber during normal operation of the proportional valve, ensuring the gas independence of the exhaust chamber and the outlet chamber, and improving the sealing performance and control accuracy of the proportional valve. Preferably, the lower valve core has an exhaust hole corresponding to the outlet chamber, and the outlet chamber communicates with the through hole through the exhaust hole. By adopting the above technical solution, since the lower valve core is provided with an exhaust hole corresponding to the outlet chamber, and the outlet chamber is connected to the through hole through the exhaust hole, the gas in the outlet chamber can flow into the through hole through the exhaust hole, realizing gas flow between the outlet chamber and the through hole. This effectively regulates the gas pressure in the outlet chamber, ensures the gas pressure stability of the direct-acting proportional valve, and improves the accuracy of flow control. Preferably, it also includes a pressure detection mechanism, which includes a pressure sensor for monitoring the gas pressure in the outlet chamber and providing feedback and regulation. By adopting the above technical solution, the direct-acting proportional valve is equipped with a pressure detection mechanism. The pressure sensor in the pressure detection mechanism can monitor the gas pressure in the outlet chamber in real time. Because the gas pressure in the outlet chamber changes with factors such as flow rate when the fluid flows in the valve, the pressure sensor can accurately capture these pressure changes and then provide feedback on the gas pressure information. The control system can regulate the working state of the valve based on the feedback information, thereby improving the control accuracy of the direct-acting proportional valve in terms of fluid pressure and flow rate and ensuring its stable operation.

[0005] In summary, this application includes at least one of the following beneficial technical effects: 1. Due to the sealed arrangement between the outlet chamber and the guide groove, the bottom of the lower valve core moves axially within the guide groove. The guide groove is equipped with a first elastic element that extends and retracts axially. The guide groove guides and limits the movement of the lower valve core, ensuring that the lower valve core can only move axially. This prevents the gas from flowing through the guide groove and affecting the accuracy of the first elastic element and the valve core after it enters the inlet chamber at high speed. The first elastic element of the guide groove and the lower valve core are not prone to shaking, thereby improving the adjustment accuracy of the air pressure regulation channel and achieving precise control of the flow rate and gas output ratio. 2. The first sealing structure and the second sealing structure are in contact to form an adjustable air pressure regulating channel. The upper valve core is driven to move down by the drive mechanism, which in turn drives the lower valve core to move, so that the first sealing structure moves relative to the second sealing structure, thereby changing the size of the air pressure regulating channel and thus achieving precise control of the outlet air pressure. 3. The valve sleeve and the lower valve core are connected from top to bottom to form an outlet chamber, an inlet chamber and a guide groove. The gas flows from the inlet chamber upwards to the outlet chamber, which will not affect the accuracy of the valve core in the bottom guide groove surrounding the second elastic element, thus adapting to industrial scenarios with high requirements for air pressure control accuracy. Attached Figure Description

[0006] Figure 1 This is a structural diagram of a direct-acting proportional valve according to this application; Figure 2 This is an exploded view of a direct-acting proportional valve according to this application; Figure 3 This is a front view of a direct-acting proportional valve according to this application; Figure 4 yes Figure 3 A cross-sectional view of the exhaust state of a direct-acting proportional valve; Figure 5 yes Figure 4 A magnified view of a portion of the image; Figure 6 This is a cross-sectional view of the normal operating state of a direct-acting proportional valve according to this application; Figure 7 yes Figure 6 A magnified view of a portion of the image.

[0007] Explanation of reference numerals in the attached drawings: 1. Drive mechanism; 2. Air pressure regulating mechanism; 3. Pressure detection mechanism; 21. Valve body; 22. Valve core; 23. Valve sleeve; 24. Valve core seal; 25. Second elastic element; 26. First sealing structure; 27. Second sealing structure; 28. First elastic element; 29. ​​Oil-free bearing; 211. Air inlet; 212. Air outlet; 213. Exhaust outlet; 214. Filter screen; 215. Sound device; 221, upper valve core; 222, lower valve core; 223, through hole; 2221, guide post; 2222, mounting cavity; 2223, exhaust hole; 231, exhaust chamber; 232, air outlet chamber; 233, air inlet chamber; 234, guide groove; 235, first sealing ring; 236, second sealing ring; 261, conical adjustment section; 262, sealing section; 2621, elastic sealing ring; 271, abutment protrusion. Detailed Implementation

[0008] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail.

[0009] This application provides an embodiment of a direct-acting proportional valve, referring to... Figure 1 and Figure 2 The system includes a drive mechanism 1, a pressure regulating mechanism 2, and a pressure detection mechanism 3. The drive mechanism 1 is located on top of the pressure regulating mechanism 2, and the pressure detection mechanism 3 is located on one side of both mechanisms. These three mechanisms work together. The drive mechanism 1 provides power to the pressure regulating mechanism 2, enabling precise control of the gas flow. This is because the power generated at the output of the drive mechanism 1 drives the components in the pressure regulating mechanism 2, thereby changing the size of the gas flow channel and thus altering the internal pressure of the outlet chamber by changing the gas flow rate. The pressure detection mechanism 3 has an internal control system that monitors the internal pressure and feeds the pressure data back to the control system in real time. The control system then adjusts the drive mechanism 1 and other components based on the feedback data to achieve precise pressure control.

[0010] Reference Figure 3 and Figure 4Specifically, the air pressure regulating mechanism 2 in this embodiment includes a valve body 21, a valve core 22, and a valve sleeve 23. The valve body 21 has an inlet 211, an outlet 212, and an exhaust port 213. The valve body 21 is a cuboid structure, with the valve sleeve 23 lining its center. A cavity structure is formed within the valve sleeve 23, and the valve core 22 is disposed within this cavity structure. The cavity structure has an upward-facing opening, and the output end of the drive mechanism 1 extends into the cavity structure from the opening, acting on the valve core 22 within the cavity structure. From top to bottom, the valve sleeve 23 and the lower valve core 222 sequentially form an exhaust chamber 231, an outlet chamber 232, an inlet chamber 233, and an exhaust chamber 232. The guide groove 234 connects the exhaust chamber 231 to the exhaust port 213, the air inlet 211 to the air inlet chamber 233, and the air outlet 212 to the air outlet chamber 232. The bottom of the valve core 22 moves axially within the guide groove 234. The air inlet 211 and the exhaust port 213 are located on the same side of the valve body 21, while the air outlet 212 is located on the opposite side of the air inlet 211. The air inlet 211 is used for gas entry, the air outlet 212 for gas exit, and the exhaust port 213 for discharging internal gas to regulate internal gas pressure. Specifically, an exhaust hole is provided on the opposite side of the lower valve core 222 located in the air outlet chamber 232, connecting the air outlet chamber 232, the exhaust hole, the through hole 223, and the exhaust chamber 231, facilitating the regulation of internal gas pressure through the exhaust port 213.

[0011] Reference Figure 2 and Figure 4 Specifically, the air inlet 211 is equipped with a filter screen 214 to filter impurities in the gas, so as to ensure the purity of the gas flowing into the proportional valve; the exhaust port 213 is equipped with a silencer 215 to prevent excessive noise from being generated when the gas is discharged from the exhaust port 213 when the internal pressure is too high.

[0012] Specifically, the valve core 22 in this embodiment includes an upper valve core 221 and a lower valve core 222. A through hole 223 is provided through the middle of the lower valve core 222. The output end of the drive mechanism 1 is connected to the top of the upper valve core 221. The bottom of the upper valve core 221 moves axially within the exhaust chamber 231. After being pushed by the upper valve core 221, the top of the lower valve core 222 can move axially within the exhaust chamber 231. The drive mechanism 1 drives the upper valve core 221 to move downwards axially to block the through hole 223 at the top of the lower valve core 222. The upper valve core 221 adopts a cylindrical structure, and its bottom is a frustum-shaped structure with a diameter gradually decreasing from top to bottom. Correspondingly, the top of the lower valve core 222 is provided with a frustum-shaped groove adapted to the frustum-shaped structure. The frustum-shaped groove is coaxially arranged with and communicates with the through hole 223.

[0013] Reference Figure 4 and Figure 5Specifically, a valve core seal 24 is fixedly installed between the inner wall of the valve sleeve 23 in the exhaust chamber 231 and the upper valve core 221. A second sealing ring 236 is installed between the valve core seal 24 and the upper valve core 221, and contacts the outer wall of the upper valve core 221. The second sealing ring 236 is located between the exhaust chamber 231 and the outlet chamber 232. A second elastic element 25 is installed inside the exhaust chamber 231. The second elastic element 25 is sleeved on the top of the lower valve core 222. The bottom of the second elastic element 25 abuts against the bottom of the exhaust chamber 231, and the top of the second elastic element 25 abuts against the outer wall of the valve core seal 24. The second elastic element 25 is a spring. The upper valve core 221 and the lower valve core 222 are both installed in the hole structure in the middle of the spring, so that the upper valve core 221 and the lower valve core 222 can move along the central axis of the spring.

[0014] Specifically, in this embodiment, a sealing structure for controlling gas flow is provided between the air inlet chamber 233 and the air outlet chamber 232. The sealing structure includes a first sealing structure 26 and a second sealing structure 27. The outer wall of the lower valve core 222 is provided with the first sealing structure 26. The first sealing structure 26 can be an annular structure integrally formed on the outer wall of the lower valve core 222. This integral design can ensure the connection strength and stability between the first sealing structure 26 and the lower valve core 222. The valve sleeve 23 is provided with the second sealing structure 27 between the air inlet chamber 233 and the air outlet chamber 232. The second sealing structure 27 can be an annular protrusion on the inner wall of the valve sleeve 23. In this embodiment, the second sealing structure 27 is made of an elastic material, such as rubber. The first sealing structure 26 movably abuts against the second sealing structure 27, forming an adjustable air pressure regulating channel between them. The first sealing structure 26 and the second sealing structure 27 change the size of the air pressure regulating channel through close contact and relative movement. When the lower valve core 222 moves downward, the initial state is that the first sealing structure 26 and the second sealing structure 27 are in contact to block the air pressure regulating channel. When the lower valve core 222 continues to move downward from the initial state, the first sealing structure 26 moves downward relative to the second sealing structure 27, the cross-sectional area of ​​the air pressure regulating channel changes, the gas flow rate is adjusted, and thus the internal air pressure is regulated.

[0015] The first sealing structure 26 comprises, from top to bottom, a conical adjusting section 261 and a blocking section 262. The diameter of the conical adjusting section 261 gradually increases from top to bottom, and its function is to regulate the flow rate through different diameter changes. The conical adjusting section 261 can be truncated cone-shaped, and its material is consistent with the first sealing structure 26. The blocking section 262 is a disc-shaped structure. The blocking section 262 is connected to the large-diameter end of the conical adjusting section 261, and the diameter of the blocking section 262 is larger than that of the conical adjusting section 261. The top of the blocking section 262 abuts against the second sealing structure 27. When the blocking section 262 moves downward, the flow rate ratio of the pressure regulating channel gradually increases. This is because when the blocking section 262 moves downward, the top of the blocking section 262 disengages from the second sealing structure 27, and the area of ​​the pressure regulating channel gradually increases. According to the relationship between gas flow rate and channel area, the gas flow rate also gradually increases.

[0016] The second sealing structure 27 has an abutting protrusion 271 on the side facing the blocking section 262. The blocking section 262 is fitted with an elastic sealing ring 2621 corresponding to the abutting protrusion 271. When the blocking section 262 moves upward, the bottom of the abutting protrusion 271 abuts against the top of the elastic sealing ring 2621 to block the air pressure regulating channel.

[0017] The guide groove 234 provides guidance for the movement of the lower valve core 222. The bottom of the lower valve core 222 moves axially within the guide groove 234, which is a cylindrical groove. An oil-free bearing 29 with a smooth inner wall is installed on the inner wall of the guide groove 234. The guide groove 234 is equipped with a first elastic element 28 for axial extension and retraction. The bottom of the first elastic element 28 is connected to the bottom of the guide groove 234. A guide post 2221, a cylindrical structure, is integrally formed with the lower valve core 222 and is made of the same material as the lower valve core 222.

[0018] The guide post 2221 has a mounting cavity 2222 in its middle, which communicates with the through hole 223. The mounting cavity 2222 is used to install the first elastic element 28. The first elastic element 28 can be a helical spring, generally made of spring steel. Spring steel has good elasticity and strength, which can ensure that the first elastic element 28 will not deform during long-term use and can provide stable elastic force. The bottom of the first elastic element 28 is connected to the bottom of the guide groove 234, and its top extends into the mounting cavity 2222, abutting against the top wall of the mounting cavity 2222. Because of the sealed arrangement between the air outlet chamber 232 and the guide groove 234 in this embodiment, the outer wall of the guide post 2221 is sealed to the inner wall of the oilless bearing 29 in the guide groove 234. Specifically, the inner wall of the valve sleeve 23 is provided with a first sealing ring 235 that contacts the outer wall of the guide post 2221. The first sealing ring 235 can be made of rubber. Rubber has good elasticity and sealing properties. Its function is to prevent gas leakage and ensure that the gas can only flow upward from the air inlet chamber 233 to the air outlet chamber 232, and flow along a predetermined path.

[0019] Specifically, the pressure detection mechanism 3 in this embodiment includes a pressure sensor, which is installed in the air outlet chamber 232 to monitor the air pressure in the air outlet chamber 232 and provide feedback and control. The pressure sensor can be a strain gauge pressure sensor, installed at a suitable position in the air outlet chamber 232, and connected to the control system via a data cable. It feeds back the air pressure data to the control system in real time, and the control system adjusts the drive mechanism 1 and other components based on the feedback data to achieve precise control of the air pressure. The strain gauge pressure sensor can convert the pressure signal into an electrical signal, which is transmitted to the control system via a data cable. The control system determines whether the air pressure in the air outlet chamber 232 is within a suitable range based on the received electrical signal. If it is not within a suitable range, the control system adjusts the action of the drive mechanism 1, thereby changing the size of the air pressure regulation channel to restore the air pressure to a suitable range.

[0020] Reference Figure 6 and Figure 7When the proportional valve is operating normally, the drive mechanism 1 drives the upper valve core 221 to move down to block the through hole 223 of the lower valve core 222. Gas enters the intake chamber 233 from the intake port 211. Due to the blockage of the through hole 223 of the upper valve core 221 and the sealing design formed between the intake chamber 233 and the guide groove 234, the gas can only flow out from the outlet chamber 232 according to the controlled gas output ratio. When the pressure detection mechanism 3 detects that the internal gas pressure of the proportional valve is too high, the drive mechanism 1 of the proportional valve stops operating, and the upper valve core 221 moves up with the output end of the drive mechanism 1, so that the upper valve core 221 and the lower valve core 222... After the lower valve core 222 loses contact with the upper valve core 221, under the deformation restoring force of the first elastic element 28, the first elastic element 28 pushes the lower valve core 222 upward, causing the first sealing structure 26 to contact the second sealing structure 27, thereby blocking the air pressure regulating channel and isolating the air inlet chamber 233. At this time, the guide groove 234, the air outlet chamber 232, the through hole 223 and the exhaust chamber 231 are connected, and the internal gas is discharged through the exhaust chamber 231, causing the internal air pressure to drop to the required pressure value. Then the drive mechanism 1 is restarted, and the proportional valve continues to operate normally.

[0021] The implementation principle of this embodiment is as follows: This direct-acting proportional valve, through a unique air pressure regulation channel design, namely the cooperation of the first sealing structure 26 and the second sealing structure 27, can accurately regulate the gas flow rate. The guide column 2221 and guide groove 234 ensure the axial movement stability of the lower valve core 222, reducing the shaking problem caused by large gas flow and improving the accuracy of flow regulation. The use of the first elastic element 28 and the second elastic element 25 enables the valve core 22 to achieve reset and buffering during movement, further improving the stability and reliability of the proportional valve. The pressure detection mechanism 3 can monitor the air pressure in real time and perform feedback regulation, ensuring that the proportional valve can accurately control the gas flow rate and pressure under different operating conditions. Compared with the prior art, it greatly improves the control accuracy of gas flow rate and output ratio, and is more suitable for industrial scenarios with high requirements for fluid control accuracy. The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A direct-acting proportional valve, comprising a drive mechanism (1) and a pressure regulating mechanism (2), wherein the pressure regulating mechanism (2) comprises a valve body (21), a valve core (22), and a valve sleeve (23), the valve body (21) being provided with an air inlet (211) and an air outlet (212), the valve core (22) comprising an upper valve core (221) and a lower valve core (222), the drive mechanism (1) driving the upper valve core (221) to move downward to block the through hole (223) of the lower valve core (222), characterized in that, The lower valve core (222) is provided with a first sealing structure (26) on its outer wall, and the valve sleeve (23) is provided with a second sealing structure (27). The first sealing structure (26) is movably abutted against the second sealing structure (27). An adjustable air pressure regulating channel is formed between the first sealing structure (26) and the second sealing structure (27). An air outlet chamber (232), an air inlet chamber (233), and a guide groove (234) are formed between the valve sleeve (23) and the lower valve core (222) from top to bottom. The bottom of the lower valve core (222) moves axially within the guide groove (234). The guide groove (234) is provided with an axially telescopic first elastic element (28). The bottom of the first elastic element (28) is connected to the bottom of the guide groove (234), and its top is connected to the bottom of the lower valve core (222). The air outlet chamber (232) and the guide groove are sealed together.

2. The direct-acting proportional valve according to claim 1, characterized in that The bottom of the lower valve core (222) is provided with a guide post (2221), and the middle part of the guide post (2221) is provided with an installation cavity (2222) that communicates with the through hole (223). The bottom of the first elastic member (28) is connected to the bottom of the guide groove (234), and its top extends into the installation cavity (2222) and abuts against the top wall of the installation cavity (2222). The outer wall of the guide post (2221) is sealed to the side wall of the guide groove (234).

3. The direct-acting proportional valve according to claim 2, characterized in that The inner wall of the valve sleeve (23) is provided with a first sealing ring (235), and the first sealing ring (235) is in contact with the outer wall of the guide post (2221).

4. The direct-acting proportional valve according to claim 1, characterized in that The first sealing structure (26) includes a tapered adjustment section (261) and a sealing section (262) from top to bottom. The diameter of the tapered adjustment section (261) gradually increases from top to bottom. The sealing section (262) is connected to the large-diameter end of the tapered adjustment section (261). The diameter of the sealing section (262) is larger than the diameter of the tapered adjustment section (261), and the top of the sealing section (262) abuts against the second sealing structure (27).

5. The direct-acting proportional valve according to claim 4, characterized in that The second sealing structure (27) has an abutting protrusion (271) on the side facing the sealing section (262), and the abutting protrusion (271) is movably abutting against the top of the sealing section (262).

6. The direct-acting proportional valve according to claim 5, characterized in that The top of the sealing section (262) is fitted with an elastic sealing ring (2621), and the abutting protrusion (271) moves against the elastic sealing ring (2621).

7. The direct-acting proportional valve according to claim 1, wherein The valve body (21) is provided with an exhaust port (213). An exhaust chamber (231) communicating with the exhaust port (213) is also provided between the valve sleeve (23) and the lower valve core (222). The exhaust chamber (231) is located above the air outlet chamber (232). The top of the lower valve core (222) extends into the exhaust chamber (231). A second elastic element (25) is provided inside the exhaust chamber (231). The second elastic element (25) is sleeved on the valve body. The lower valve core (222) is topped with a valve core seal (24) on the outer wall of the upper valve core (221). The bottom of the second elastic member (25) is connected to the bottom wall of the exhaust chamber (231), and its top is connected to the valve core seal (24). The valve sleeve (23) is provided with a second sealing ring (236) that contacts the outer wall of the lower valve core (222). The second sealing ring (236) is located between the exhaust chamber (231) and the air outlet chamber (232).

8. The direct-acting proportional valve according to claim 1, characterized in that The lower valve core (222) is provided with an exhaust hole (2223) corresponding to the exhaust chamber (232), and the exhaust chamber (232) is connected to the through hole (223) through the exhaust hole (2223).

9. The direct-acting proportional valve according to claim 1, wherein It also includes a pressure detection mechanism (3), which includes a pressure sensor for monitoring the air pressure in the air outlet chamber (232) and providing feedback and regulation.

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