A stable output flow regulating valve

Abstract

This application relates to a stable output flow regulating valve, which falls within the field of fluid flow regulating devices. It includes a valve seat, a valve cover, a diaphragm, and a valve core. The valve cover is mounted on the valve seat, forming a valve cavity between the valve cover and the valve seat. The diaphragm is disposed within the valve cavity, dividing it into a first valve cavity and a second valve cavity. The valve seat has a valve orifice communicating with the second valve cavity. The valve core is mounted within the valve orifice and its axial position within the orifice is adjustable. The valve seat has a fluid inlet and a fluid outlet. A first throttling channel is provided between the fluid inlet and the second valve cavity. The fluid outlet communicates with the valve orifice. The valve core has a second throttling channel located between the second valve cavity and the fluid outlet. The valve cover has an input fluid connection port communicating with the first valve cavity. The diaphragm is positioned adjacent to the openings of the first and second throttling channels, thereby improving the stability of the output flow of the flow regulating valve.

Description

Technical Field

[0001] This application relates to the field of fluid flow regulating devices, and more particularly to a stable output flow regulating valve. Background Technology

[0002] Online component analysis of sample gases typically requires a fixed sample gas flow rate. Changes in the sample gas flow rate during analysis can significantly impact the accuracy of component detection. Therefore, flow control valves are usually installed in the sample gas delivery pipeline to ensure a stable flow rate of sample gas delivered to the online analyzer.

[0003] A flow control valve, also known as a flow regulating valve or flow balancing valve, is a device used to regulate the flow rate of fluids in pipelines. It typically adjusts the flow rate by changing the size of the flow area at the valve orifice. However, even with a constant flow area, the fluid flow rate through the flow control valve will still change with fluid pressure. Adjusting the flow area only regulates the flow rate at a set pressure and cannot guarantee a stable flow rate under different pressure conditions. Therefore, to maintain a stable output flow rate, the flow area at the valve orifice needs to be adjusted in real time according to the fluid pressure.

[0004] Existing flow control valves designed to improve output flow stability typically have a connection port to the external environment. They use the pressure of the external environment as a reference pressure to determine changes in fluid pressure and adjust the flow area of ​​the valve orifice accordingly. However, this adjustment method uses changes in fluid pressure as the reference, not changes in fluid flow rate. Changes in fluid flow rate lag behind changes in fluid pressure, and the adjustment sensitivity is insufficient. It often only mitigates short-term changes in flow rate but cannot guarantee long-term flow stability. Summary of the Invention

[0005] To improve the stability of the output flow of a flow regulating valve, this application provides a stable output flow regulating valve.

[0006] The stable output flow regulating valve provided in this application adopts the following technical solution: A stable output flow regulating valve includes a valve seat, a valve cover, a diaphragm, and a valve core. The valve cover is mounted on the valve seat, forming a valve cavity between the valve cover and the valve seat. The diaphragm is disposed within the valve cavity, dividing the valve cavity into a first valve cavity and a second valve cavity. The valve seat has a valve hole communicating with the second valve cavity. The valve core is mounted within the valve hole and is adjustable in its axial position within the valve hole. The valve seat has a fluid inlet and a fluid outlet. A first throttling channel is provided between the fluid inlet and the second valve cavity. The fluid outlet is connected to the valve hole. The valve core has a second throttling channel, which is located between the second valve cavity and the fluid outlet. The valve cover has an input fluid connection port, which is connected to the first valve cavity. The diaphragm is disposed adjacent to the openings of the first and second throttling channels.

[0007] By employing the above technical solution, utilizing the first throttling channel located between the fluid inlet and the second valve chamber, and the second throttling channel located inside the valve core connecting the second valve chamber and the fluid outlet, different pressures can be generated when the fluid flow rate changes. This transforms the change in the output flow rate of the flow control valve into a change in pressure, thereby adjusting the valve orifice size to ensure stable output flow. Utilizing the first valve chamber located on both sides of the diaphragm and connected to the input fluid inlet, and the second valve chamber connected to the fluid inlet through the first throttling channel, a change in the pressure difference between the first and second valve chambers can be generated when the output flow rate of the flow control valve changes. This drives the diaphragm to move and automatically adjust the inlet flow area of ​​the second throttling channel, ensuring stable fluid output flow. By adjusting the axial position of the valve core within the valve orifice, the distance between the opening of the second throttling channel and the diaphragm can be adjusted, thereby adjusting the inlet flow area of ​​the second throttling channel and regulating the output flow rate of the flow control valve.

[0008] In one specific implementation, the second throttling channel includes an axial throttling orifice and a radial connecting orifice. The axial throttling orifice extends axially from one end of the valve core adjacent to the diaphragm. A flow-through annular groove is provided on the outer circumferential surface of the valve core. The radial connecting orifice connects the flow-through annular groove and the axial throttling orifice. An output communication orifice is provided between the fluid outlet and the valve orifice. The output communication orifice is disposed opposite to the flow-through annular groove.

[0009] By adopting the above technical solution, the axial throttling orifice, located near the diaphragm end of the valve core and extending along the valve core's axial direction, effectively changes the inlet flow area of ​​the axial throttling orifice as the valve core's axial position within the valve orifice changes, thus improving the regulation effect of fluid output flow. The flow-through annular groove on the outer circumferential surface of the valve core ensures stable communication between the radial connecting hole and the fluid output port when the valve core's axial position changes, guaranteeing stable fluid output through the fluid output port.

[0010] In one specific implementation scheme, the valve seat is provided with a valve core adjusting groove at the end away from the valve cover, the bottom of the valve core adjusting groove is provided with a valve core connecting hole that communicates with the valve hole, the wall of the valve core connecting hole is provided with a connecting thread, the end of the valve core away from the diaphragm is threadedly connected to the wall of the valve core connecting hole, and the end is provided with a valve core adjusting structure.

[0011] By adopting the above technical solution, and utilizing the threaded connection between one end of the valve core and the wall of the valve core connecting hole, the axial position of the valve core within the valve hole can be stably adjusted by rotating the valve core, thereby improving the stability and accuracy of the axial position adjustment. Furthermore, by utilizing the valve core adjustment structure located at the end of the valve core furthest from the diaphragm, the valve core can be easily rotated via the valve core adjustment groove, thus achieving adjustment of the axial position of the valve core within the valve hole.

[0012] In one specific implementation, a sealing cover is provided in the valve core adjusting groove, the sealing cover is threadedly connected to the side wall of the valve core adjusting groove, and a sealing ring is provided between the sealing cover and the side wall of the valve core adjusting groove.

[0013] By adopting the above technical solution, the sealing cover in the valve core adjustment groove is connected by a thread, which can isolate the valve core adjustment groove from the external environment during use. When it is necessary to adjust the output flow, the sealing cover can be easily removed to adjust the position of the valve core. When the sealing cover is screwed into the valve core adjustment groove, the sealing ring is used to form a seal inside and outside the valve core adjustment groove.

[0014] In one specific implementation, multiple radial connecting holes are provided, which are located at different positions around the flow ring groove and extend into the interior of the valve core, communicating with the axial throttling hole.

[0015] By adopting the above technical solution, and utilizing multiple radial connecting holes that are connected to different positions around the flow ring groove, the stability of the fluid flow into the flow ring groove through the axial throttling hole can be improved, ensuring the stable flow of fluid to the fluid output port when the valve core is in different rotational positions.

[0016] In one specific implementation, there are two fluid outlets, which are located at different positions around the valve seat. Each fluid outlet is connected to the valve hole through the output communication hole, and the output communication hole is arranged opposite to the flow ring groove.

[0017] By adopting the above technical solution, and using two fluid output ports located at different positions around the valve seat, it is possible to output fluid through one fluid output port while simultaneously connecting a pressure gauge or other monitoring device through the other fluid output port to monitor parameters such as the output pressure of the fluid.

[0018] In one specific implementation scheme, a throttling channel adjustment structure is provided in the fluid inlet, and the throttling channel adjustment structure can adjust the size of the first throttling channel inlet.

[0019] By adopting the above technical solution, the throttling channel adjustment structure, which adjusts the size of the inlet of the first throttling channel, can adjust the pressure drop when the fluid passes through the first throttling channel, thereby adjusting the pressure difference between the first valve chamber and the second valve chamber when the fluid flow rate changes, changing the sensitivity of the diaphragm movement when the fluid flow rate changes, and ensuring the stability of the low-pressure adjustable output flow rate.

[0020] In one specific implementation scheme, the throttling channel adjustment structure includes a throttling adjustment sleeve and a damping pad. The side wall of the throttling adjustment sleeve is provided with a circumferentially extending channel inlet groove, and the width of the channel inlet groove is different at different circumferential positions. The throttling adjustment sleeve is rotatably installed in the fluid inlet. The side wall of the throttling adjustment sleeve covers the inlet of the first throttling channel, and the channel inlet groove is located at a position opposite to the inlet of the first throttling channel. The damping pad is disposed between the bottom wall of the throttling adjustment sleeve and the bottom wall of the fluid inlet.

[0021] By adopting the above technical solution, and utilizing the channel inlet slots of different widths set on the side wall of the throttling sleeve, the size of the first throttling channel inlet can be slowly adjusted by rotating the throttling sleeve, thereby improving the adjustment accuracy of the flow area of ​​the first throttling channel inlet. Furthermore, by using the damping pad set between the bottom wall of the throttling sleeve and the bottom wall of the fluid inlet, the positional stability of the throttling sleeve within the fluid inlet can be improved, preventing uncontrolled changes in the position of the throttling sleeve during operation.

[0022] In one specific implementation, the stable output flow regulating valve of this application further includes a pressure ring, which is sleeved on the valve cover and threadedly connected to the valve seat so as to press and fix the valve cover on the valve seat. The valve cover and the valve seat are provided with cavity grooves at relative positions, and the diaphragm is disposed between the valve cover and the valve seat.

[0023] By adopting the above technical solution, the pressure ring connected to the valve seat threadedly can not only facilitate the connection between the valve cover and the valve seat, making it easier to install the valve core in the valve hole, but also easily press and fix the diaphragm between the valve cover and the valve seat, forming a separation of the valve cavity, which facilitates the assembly and maintenance of the stable output flow regulating valve of this application.

[0024] In one specific implementation, the distance between the diaphragm and the outlet of the first throttling channel is less than the diameter of the first throttling channel, and the distance between the diaphragm and the end of the valve core is less than the diameter of the second throttling channel.

[0025] By adopting the above technical solution, and by controlling the distance between the diaphragm and the outlet of the first throttling channel and the end of the valve core, the influence of the diaphragm movement on the flow rate of the first throttling channel and the second throttling channel can be controlled, thereby controlling the self-stabilizing effect of the output flow rate of the stable output flow regulating valve of this application.

[0026] In summary, this application includes at least one of the following beneficial technical effects: By setting a first throttling channel between the fluid inlet and the second valve chamber, and a second throttling channel between the second valve chamber and the fluid outlet, the change in fluid output flow rate can be converted into a change in pressure in the second valve chamber. Thus, when the fluid output flow rate changes, a pressure difference is formed between the second valve chamber and the first valve chamber connected to the fluid inlet. This pressure difference is used to regulate the fluid output flow rate, thereby achieving self-stabilization of the fluid output flow rate. By using a diaphragm positioned between the first and second valve chambers, small pressure changes between the two chambers can be converted into significant changes in the diaphragm position. This changes the distance between the diaphragm and the inlet of the second throttling channel, thereby altering the flow rate of the fluid through the second throttling channel, which is the output flow rate of the flow control valve. This counteracts changes in the fluid output flow rate caused by external factors, ensuring the stability of the fluid output flow rate during operation. The axial position of the valve core in the valve hole can be easily adjusted by the threaded connection between the valve core end and the valve core connection hole sidewall on the valve seat, thereby accurately adjusting the distance between the inlet of the second throttling channel and the diaphragm, and realizing the regulation of the output flow of the flow regulating valve. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of one embodiment of this application.

[0028] Figure 2 This is a schematic diagram of an axial cross-section of one embodiment of this application.

[0029] Figure 3This is a schematic diagram of the diaphragm structure in one embodiment of this application.

[0030] Figure 4 This is a schematic diagram of a valve seat structure in one embodiment of this application (where (a) and (b) show two different perspectives).

[0031] Figure 5 This is a schematic diagram of the valve core structure in one embodiment of this application (where (a) and (b) show two different perspectives).

[0032] Figure 6 This is a schematic diagram of the valve cover structure in one embodiment of this application (where (a) and (b) show two different perspectives).

[0033] Figure 7 This is a schematic diagram of an axial cross-section from another angle, representing one embodiment of this application.

[0034] Figure 8 This is a schematic diagram of the throttling channel adjustment structure in one embodiment of this application.

[0035] Explanation of reference numerals in the attached drawings: 1. Valve seat; 11. Valve orifice; 111. Valve core connection hole; 12. Fluid inlet; 121. Throttling adjustment sleeve; 122. Damping pad; 123. Channel inlet groove; 13. Fluid outlet; 131. Output connecting hole; 14. First throttling channel; 15. Valve core adjustment groove; 16. Sealing cover; 2. Valve cover; 21. Inlet fluid connection port; 3. Diaphragm; 4. Valve core; 41. Second throttling channel; 411. Axial throttling orifice; 412. Radial connection hole; 42. Flow ring groove; 43. Valve core adjustment structure; 44. Valve core sealing ring; 5. Valve cavity; 51. First valve cavity; 52. Second valve cavity; 6. Pressure ring. Detailed Implementation

[0036] The specific embodiments of this application will now be described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0037] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two elements or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0038] One embodiment of the stable output flow regulating valve of this application is as follows: Figures 1 to 6As shown, the valve includes a valve seat 1, a valve cover 2, a diaphragm 3, and a valve core 4. The valve seat 1 forms the structural base of the stable output flow regulating valve of this application, serving as the mounting base for other structural components in the stable output flow regulating valve of this application. The valve cover 2 is installed at one end of the valve seat 1. The valve cover 2 can be directly installed and fixed to the valve seat 1 through a connecting structure, or it can be installed and fixed to the valve seat 1 through an attached structural component. A valve cavity 5 is provided between the valve cover 2 and the valve seat 1. The cavity of the valve cavity 5 can be located on the valve seat 1, or it can be located on the valve cover 2, or it can be partially located on the valve seat 1 and partially located on the valve cover 2. When the valve cover 2 is installed and fixed to the valve seat 1, it covers the internal space between the valve cover 2 and the valve seat 1 to form the valve cavity 5.

[0039] The diaphragm 3 is a circular thin sheet made of elastic material. One or more concentrically arranged corrugated rings may be provided on the diaphragm 3 to enhance its elastic deformation capability. The periphery of the diaphragm 3 is sealed to the side wall of the valve cavity 5, dividing the valve cavity 5 into a first valve cavity 51 and a second valve cavity 52 that are separated from each other.

[0040] The valve seat 1 also has a valve hole 11 communicating with the second valve chamber 52, extending from one end of the valve seat 1 to the other. The valve core 4 is slidably mounted in the valve hole 11, forming a seal between the valve core 4 and the side wall of the valve hole 11. A valve core position adjustment structure is provided between the valve core 4 and the valve seat 1. The valve core position adjustment structure can be any suitable adjustment structure provided on the valve core 4 and / or the valve seat 1 that can drive the valve core 4 to slide axially in the valve hole 11, or any suitable independent adjustment structure provided between the valve core 4 and the valve seat 1 that can drive the valve core 4 to slide axially in the valve hole 11. The valve core position adjustment structure can be used to drive the valve core 4 to slide in the valve hole 11, thereby adjusting the distance between the end of the valve core 4 and the diaphragm 3.

[0041] Fluid inlet 12 and fluid outlet 13 are respectively provided at different positions on the side wall of valve seat 1. The fluid inlet 12 and fluid outlet 13 can be connected to external fluid inlet pipe and fluid outlet pipe respectively. The working fluid such as sample gas to be detected is introduced from the fluid inlet pipe and output through the fluid outlet pipe, thereby adjusting the flow rate of the working fluid output through the fluid outlet pipe.

[0042] A first throttling channel 14 is provided between the fluid inlet 12 and the second valve chamber 52. The flow area of ​​the first throttling channel 14 is significantly smaller than that of the fluid inlet 12 and the second valve chamber 52, resulting in greater flow resistance when the fluid flows within the first throttling channel 14. The fluid outlet 13 is connected to the valve orifice 11. A second throttling channel 41 is provided within the valve core 4. The flow area of ​​the second throttling channel 41 is significantly smaller than that of the second valve chamber 52 and the fluid outlet 13, resulting in greater flow resistance when the fluid flows within the second throttling channel 41. One end of the second throttling channel 41 is connected to the second valve chamber 52, and the other end is connected to the valve orifice 11, and then connected to the fluid outlet 13 through the valve orifice 11. The working fluid flowing in through the fluid inlet 12 enters the second valve chamber 52 through the first throttling channel 14, and flows from the second valve chamber 52 through the second throttling channel 41 and the valve orifice 11 into the fluid outlet 13, and is then output through the fluid outlet 13. The first throttling channel 14 and the second throttling channel 41 respectively form a relative isolation between the fluid pressure in the second valve chamber 52 and the fluid pressure in the fluid inlet 12 and the fluid outlet 13, so that the second valve chamber 52 can form a fluid pressure of different magnitude than that in the fluid inlet 12 and the fluid outlet 13.

[0043] An input fluid connection port 21 is provided on the valve cover 2, which is connected to the first valve chamber 51. The input fluid connection port 21 is usually connected to the fluid input pipe through a pipe, thereby transmitting the input pressure of the working fluid to the first valve chamber 51. Since the fluid will cause a pressure drop when flowing in the first throttling channel 14, the pressure of the fluid in the second valve chamber 52 will be lower than the pressure of the fluid in the first valve chamber 51, creating a pressure difference on both sides of the diaphragm 3. This pressure difference will push the middle part of the diaphragm 3 to deform towards the valve core 4, causing the middle part of the diaphragm 3 to move towards the inlet of the second throttling channel 41. The corrugated ring provided on the diaphragm 3 can improve the deformation capability of the diaphragm 3, increase the displacement of the middle part of the diaphragm 3 under the same pressure difference, and increase the sensitivity of the diaphragm 3 to the pressure difference between the first valve chamber 51 and the second valve chamber 52.

[0044] The diaphragm 3 is positioned close to the outlet of the first throttling channel 14 and the inlet of the second throttling channel 41, allowing the movement of the middle portion of the diaphragm 3 to significantly affect the flow area and flow rate of the first throttling channel 14 and the second throttling channel 41. By adjusting the axial position of the valve core 4 within the valve orifice 11, the flow rate of the second throttling channel 41 on the valve core 4 can be adjusted, thereby regulating the output flow rate of the stable output flow regulating valve of this application.

[0045] When the fluid flow rate output through fluid outlet 13 increases, the fluid flow rate through the first throttling channel 14 also increases, leading to a greater decrease in fluid pressure as the fluid passes through the first throttling channel 14. This increases the pressure difference between the fluid inlet 12 and the second valve chamber 52. Since the inlet fluid connection 21 is connected to the inlet 12 via a pipe and is also connected to the first valve chamber 51, and there is no fluid flow in the first valve chamber 51, the pressure in the first valve chamber 51 is the same as the pressure in the inlet 12. The pressure difference between the first and second valve chambers 51 increases synchronously. Under the influence of this greater pressure difference, the middle part of the diaphragm 3 moves further towards the valve core 4, bringing the diaphragm 3 closer to the inlet of the second throttling channel 41. This reduces the flow area and flow rate of the second throttling channel 41, thus decreasing the fluid flow rate output through fluid outlet 13 and ensuring a stable output flow rate.

[0046] Conversely, when the fluid flow rate output through fluid outlet 13 decreases, the fluid flow rate through the first throttling channel 14 also decreases. This results in a smaller drop in fluid pressure as the fluid passes through the first throttling channel 14, reducing the pressure difference between the fluid pressure in fluid inlet 12 and the fluid pressure in the second valve chamber 52. Consequently, the pressure difference between the fluid in the first valve chamber 51 and the second valve chamber 52 decreases synchronously. Under the influence of a smaller pressure difference, the middle part of diaphragm 3 moves away from the valve core 4. As diaphragm 3 moves further away from the inlet of the second throttling channel 41, the flow area and flow rate of the second throttling channel 41 increase, thereby increasing the fluid flow rate output through fluid outlet 13 and ensuring the stability of the output flow rate from fluid outlet 13.

[0047] This allows for adaptive regulation of fluid flow rate without external power, utilizing the interaction between the diaphragm 3 and the first throttling channel 14 and the second throttling channel 41 to convert fluctuations in fluid flow rate into a pressure difference across the diaphragm 3. This achieves adaptive regulation of fluid flow rate, avoiding the impact of fluid pressure fluctuations on the fluid flow rate and effectively improving the sensitivity and stability of the adaptive regulation of output flow rate. In contrast, existing flow control valves primarily rely on adjusting the fluid input and output pressures for adaptive regulation, focusing on maintaining stable input and output pressures, which is insufficient for precise flow rate control.

[0048] In some embodiments of the stable output flow regulating valve of this application, such as Figure 2 and Figure 5 As shown, the second throttling channel 41 includes an axial throttling orifice 411 and a radial connecting orifice 412. The axial throttling orifice 411 is located at the end of the valve core 4 near the diaphragm 3, extending from the end face along the axial direction of the valve core 4 into the interior of the valve core 4. A sealing ring may also be provided at the opening of the axial throttling orifice 411 on the end face of the valve core 4.

[0049] A flow-through annular groove 42 perpendicular to the central axis of the valve core 4 is provided on the outer circumferential surface of the valve core 4, forming an annular flow-through channel within the valve hole 11. The flow-through annular groove 42 is typically wide enough to ensure a large coverage area for the annular flow-through channel. A valve core sealing groove is provided on each axial side of the flow-through annular groove 42 on the valve core 4, and a valve core sealing ring 44 is provided in each valve core sealing groove. The valve core sealing ring 44 ensures isolation and sealing between the annular flow-through channel and the channels on both sides of the valve hole 11. A radial connecting hole 412 is formed in the flow-through annular groove 42, extending from the bottom wall of the flow-through annular groove 42 towards the central axis of the valve core 4, and communicating with the axial throttling hole 411.

[0050] An output communication hole 131 is provided between the fluid output port 13 and the valve hole 11. One end of the output communication hole 131 opens into the fluid output port 13, and the other end opens into the side wall of the valve hole 11, located on the side wall of the valve hole 11 at a position corresponding to the flow ring groove 42, so that the output communication hole 131 is connected to the radial connection hole 412 through the flow ring groove 42. The flow ring groove 42 can ensure that when the valve core 4 slides axially in the valve hole 11, the fluid output port 13 maintains a stable connection with the second throttling channel 41.

[0051] In a preferred embodiment of the stable output flow regulating valve of this application, such as Figure 2 and Figure 4 As shown, a valve core adjusting groove 15 is provided at the end of the valve seat 1 away from the valve cover 2. The valve core adjusting groove 15 is a circular groove formed on the end face of the valve seat 1, and the valve core adjusting groove 15 is usually coaxially arranged with the valve hole 11. A valve core connecting hole 111 communicating with the valve hole 11 is provided on the bottom wall of the valve core adjusting groove 15. The valve core connecting hole 111 is coaxially arranged with the valve hole 11, and a connecting thread is provided on the wall of the valve core connecting hole 111.

[0052] like Figure 5 As shown, a valve core connecting part is provided at the end of the valve core 4 away from the diaphragm 3. A connecting thread adapted to the connecting thread on the side wall of the valve core connecting hole 111 is provided on the valve core connecting part. The valve core is installed in the valve core connecting hole 111 through the cooperation between the connecting threads, forming a threaded connection between the valve core connecting hole 111 and the valve seat 1 on the side wall of the valve core connecting hole 111.

[0053] A valve core adjustment structure 43 is provided on the end face of the valve core connection part. Typically, the valve core adjustment structure 43 is an internal hexagonal hole provided on the end face of the valve core connection part, so that the valve core 4 can be easily rotated through the valve core adjustment groove 15 using an internal hexagonal wrench, thereby adjusting the axial position of the valve core 4 in the valve hole 11.

[0054] As one specific embodiment of the stable output flow regulating valve of this application, such as Figure 2 As shown, a sealing cover 16 is provided in the valve core adjusting groove 15. A connecting thread is provided on the outer peripheral surface of the sealing cover 16, and the connecting thread is connected to the thread provided on the side wall of the valve core adjusting groove 15 through the connecting thread.

[0055] A sealing ring groove is provided at the bottom of the side wall of the valve core adjusting groove 15. A sealing ring is provided in the sealing ring groove, and the sealing ring is used to form a seal between the sealing cover 16 and the side wall of the valve core adjusting groove 15. This prevents the fluid in the valve hole 11 from leaking through the valve core connecting hole 111 and the valve core adjusting groove 15, and prevents pollutants in the external environment from entering the valve hole 11 and having an adverse effect on the stable operation of the flow regulating valve.

[0056] In some embodiments of the stable output flow regulating valve of this application, such as Figure 2 As shown, multiple radial connecting holes 412 are provided on the outer circumferential surface of the valve core 4. The number of radial connecting holes 412 can be determined according to the diameter of the valve core 4, and is usually 2-4. The outer ends of the multiple radial connecting holes 412 open at different circumferential positions on the bottom of the flow ring groove 42, and the inner ends extend towards the central axis of the valve core 4, all communicating with the axial throttling orifice 411. The provision of multiple radial connecting holes 412 enables the fluid from the axial throttling orifice 411 to flow evenly to different circumferential positions in the flow ring groove 42, reducing the circumferential flow distance of the fluid in the flow ring groove 42, and ensuring the consistency of fluid flow resistance when the valve core 4 rotates in the valve orifice 11.

[0057] In a preferred embodiment of the stable output flow regulating valve of this application, such as Figure 2 , Figure 4 and Figure 7 As shown, two fluid outlet ports 13 are provided on the outer wall of the valve seat 1. The two fluid outlet ports 13 are located at different circumferential positions on the outer wall of the valve seat 1. In this embodiment, one fluid outlet port 13 is arranged opposite to the fluid inlet port 12 on the outer wall of the valve seat 1, and the other fluid outlet port 13 is arranged at a position perpendicular to both of them.

[0058] The bottoms of the two fluid outlet ports 13 are connected to the valve port 11 through the outlet communication hole 131, and the openings of the two outlet communication holes 131 on the side wall of the valve port 11 are located within the area of ​​the flow ring groove 42.

[0059] In some embodiments of the stable output flow regulating valve of this application, such as Figure 2As shown, a throttling channel adjustment structure is provided at the bottom of the fluid inlet 12. The throttling channel adjustment structure can be any suitable mechanical structure capable of adjusting the opening of the first throttling channel 14 within the fluid inlet 12, i.e., the size of the inlet of the first throttling channel 14. Typically, the throttling channel adjustment structure can partially block the inlet of the first throttling channel 14 and adjust the size of the blocked portion, thereby adjusting the pressure drop when fluid of the same flow rate passes through the first throttling channel 14. This allows adjustment of the pressure difference between the first valve chamber 51 and the second valve chamber 52 formed when fluid of the same flow rate passes through, thereby adjusting the sensitivity of the diaphragm 3 deformation amplitude to changes in fluid flow rate, which is the sensitivity of the stable output flow rate regulating valve of this application to self-stabilize the output flow rate.

[0060] In a preferred embodiment of the stable output flow regulating valve of this application, such as Figure 2 and Figure 8 As shown, a throttling channel adjustment structure includes a throttling adjustment sleeve 121 and a damping pad 122. The throttling adjustment sleeve 121 is an annular sleeve with one end closed and the other end open. A channel inlet groove 123 is provided on the side wall of the throttling adjustment sleeve 121. The channel inlet groove 123 extends circumferentially along the throttling adjustment sleeve, and the width of the channel inlet groove 123 is different at different positions circumferentially on the throttling adjustment sleeve 121. The closed end of the throttling adjustment sleeve 121 is rotatably mounted on the bottom wall of the fluid inlet 12, so that the side wall of the throttling adjustment sleeve 121 can cover the inlet of the first throttling channel 14. At the same time, the channel inlet groove 123 is positioned opposite to the inlet of the first throttling channel 14, so that the fluid in the fluid inlet 12 can flow into the first throttling channel 14 through the channel inlet groove 123.

[0061] The width of the channel inlet groove 123 is typically smaller than the diameter of the first throttling channel 14. When the throttling adjustment sleeve 121 rotates in the fluid inlet 12, different positions of the channel inlet groove 123 obstruct the inlet of the first throttling channel 14, resulting in inlet areas of different sizes for the first throttling channel 14. A hexagonal adjustment structure is provided on the bottom wall of the throttling adjustment sleeve 121, allowing the throttling adjustment sleeve 121 to be rotated through the fluid inlet 12 using a corresponding wrench, thereby adjusting the rotational position of the throttling adjustment sleeve 121.

[0062] A limiting pin can also be provided on the outer side of the bottom wall of the throttling adjustment sleeve 121, and an arc-shaped limiting groove is provided at the corresponding position on the bottom wall of the fluid inlet 12. When the throttling adjustment sleeve 121 rotates, the limiting pin on its bottom wall slides in the arc-shaped limiting groove. The arc-shaped limiting groove is used to limit the rotation angle of the throttling adjustment sleeve 121 and limit the degree of adjustment of the inlet flow area of ​​the first throttling channel 14.

[0063] The damping pad 122 is typically made of a material with a high coefficient of friction. It is positioned between the bottom wall of the throttling sleeve 121 and the bottom wall of the fluid inlet 12 to ensure the stability of the throttling sleeve 121 in the non-adjusting state and to prevent vibration and other factors from affecting its position. The damping pad 122 can be bonded to the bottom wall of the fluid inlet 12. An arc-shaped groove can also be provided on the damping pad 122 at a position corresponding to the arc-shaped limiting groove, allowing the limiting pin to slide within the groove.

[0064] In some embodiments of the stable output flow regulating valve of this application, such as Figure 2 As shown, the stable output flow regulating valve of this application is further provided with a pressure ring 6. The inner side wall of the pressure ring 6 is provided with a connecting thread, and one end is provided with a clamping flange. A clamping groove adapted to the clamping flange is provided at one end of the valve cover 2. The pressure ring 6 is sleeved on the valve cover 2, so that the clamping flange is engaged in the clamping groove. A connecting thread adapted to the connecting thread on the pressure ring 6 is provided on the outer side wall of one end of the valve seat 1. The pressure ring 6 is screwed onto the valve seat 1 through the fit between the connecting threads, pressing and fixing the valve cover 2 onto the valve seat 1, thus forming the installation and fixation of the valve cover 2 on the valve seat 1.

[0065] Cavity grooves are provided at relative positions on both the valve cover 2 and the valve seat 1. The diaphragm 3 is disposed between the valve cover 2 and the valve seat 1. By rotating the pressure ring 6, the valve cover 2 can be pushed to press and fix the peripheral part of the diaphragm 3 between the valve cover 2 and the valve seat 1. The diaphragm 3 closes the cavity groove on the valve cover 2 to form the first valve cavity 51, and closes the cavity groove on the valve seat 1 to form the second valve cavity 52.

[0066] The threaded connection between the pressure ring 6 and the valve seat 1 facilitates the installation and removal of the pressure ring 6 and the valve cover 2 on the valve seat 1, thereby facilitating the replacement and maintenance of the easily damaged diaphragm 3. A cavity sealing groove can also be provided on the outer periphery of the cavity groove on the closed valve seat 1, and a cavity sealing ring is provided in the cavity sealing groove to ensure the seal between the diaphragm 3 and the valve seat 1.

[0067] In a preferred embodiment of the stable output flow regulating valve of this application, such as Figure 2 As shown, in the initial state, the distance between the diaphragm 3 and the outlet of the first throttling channel 14 is less than the diameter of the first throttling channel 14. This increases the resistance of the fluid passing through the outlet of the first throttling channel 14 when the diaphragm 3 deforms towards the first throttling channel 14. Therefore, before external fluctuations are eliminated, the self-regulating flow rate of the stable output flow regulating valve of this application allows the output flow rate to recover, and even after recovery, a large pressure difference remains between the first valve chamber 51 and the second valve chamber 52, maintaining the self-regulating effect of the diaphragm 3 on the output flow rate.

[0068] The distance between the diaphragm 3 and the end of the valve core 4 is smaller than the diameter of the second throttling channel 41, which makes the deformation of the diaphragm 3 have a greater impact on the resistance of the fluid entering the inlet of the second throttling channel 41, thereby improving the self-regulating effect of the diaphragm 3 deformation on the fluid output flow. The second throttling channel 41 is usually set directly opposite the center of the diaphragm 3 to enhance the influence of the diaphragm 3 deformation on the resistance of the fluid flowing into the second throttling channel 41.

[0069] In the description of this application, the references to terms such as "an embodiment," "specific embodiment," and "preferred embodiment" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0070] 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 stable output flow regulating valve, characterized in that, The valve includes a valve seat (1), a valve cover (2), a diaphragm (3), and a valve core (4). The valve cover (2) is mounted on the valve seat (1), forming a valve cavity (5) between the valve cover (2) and the valve seat (1). The diaphragm (3) is disposed in the valve cavity (5), dividing the valve cavity (5) into a first valve cavity (51) and a second valve cavity (52). The valve seat (1) is provided with a valve hole (11) communicating with the second valve cavity (52). The valve core (4) is installed in the valve hole (11) and can be adjusted in axial position within the valve hole (11). The valve seat (1) is provided with a fluid inlet (12) and a fluid outlet (13). The fluid inlet (12) is connected to an external fluid inlet pipe, and the fluid outlet (13) is connected to an external fluid inlet pipe. The valve core (4) is connected to an external fluid output pipe. A first throttling channel (14) is provided between the fluid input port (12) and the second valve chamber (52). The fluid output port (13) is connected to the valve hole (11). A second throttling channel (41) is provided inside the valve core (4). The second throttling channel (41) is provided between the second valve chamber (52) and the fluid output port (13). An input fluid connection port (21) is provided on the valve cover (2). The input fluid connection port (21) is connected to the fluid input pipe through a pipe. The input fluid connection port (21) is connected to the first valve chamber (51). The diaphragm (3) is provided adjacent to the openings of the first throttling channel (14) and the second throttling channel (41). A valve core position adjustment structure is provided between the valve core (4) and the valve seat (1). The valve core position adjustment structure can drive the valve core (4) to slide in the valve hole (11), thereby adjusting the distance between the end of the valve core (4) and the diaphragm (3). A throttling channel adjustment structure is provided inside the fluid inlet (12). The throttling channel adjustment structure can adjust the size of the inlet of the first throttling channel (14). The throttling channel adjustment structure includes a throttling adjustment sleeve (121) and a damping pad (122). The side wall of the throttling adjustment sleeve (121) is provided with a circumferentially extending channel inlet groove (123). The width of the channel inlet groove (123) is different at different circumferential positions. The throttling adjustment sleeve (121) is rotatably installed inside the fluid inlet (12). The side wall of the throttling adjustment sleeve (121) covers the inlet of the first throttling channel (14). The channel inlet groove (123) is located at the relative position of the inlet of the first throttling channel (14). The damping pad (122) is disposed between the bottom wall of the throttling adjustment sleeve (121) and the bottom wall of the fluid inlet (12).

2. The stable output flow regulating valve according to claim 1, characterized in that... The second throttling channel (41) includes an axial throttling orifice (411) and a radial connecting orifice (412). The axial throttling orifice (411) extends along the axial direction of the valve core (4) from one end of the valve core (4) adjacent to the diaphragm (3). A flow-through annular groove (42) is provided on the outer circumferential surface of the valve core (4). The radial connecting orifice (412) connects the flow-through annular groove (42) and the axial throttling orifice (411). An output connecting orifice (131) is provided between the fluid outlet (13) and the valve orifice (11). The output connecting orifice (131) is disposed opposite to the flow-through annular groove (42).

3. The stable output flow regulating valve according to claim 2, characterized in that... The valve seat (1) is provided with a valve core adjustment groove (15) at one end away from the valve cover (2). The bottom of the valve core adjustment groove (15) is provided with a valve core connection hole (111) that communicates with the valve hole (11). The wall of the valve core connection hole (111) is provided with a connection thread. The valve core (4) is threaded to the wall of the valve core connection hole (111) at one end away from the diaphragm (3), and a valve core adjustment structure (43) is provided at the end.

4. The stable output flow regulating valve according to claim 3, characterized in that... A sealing cover (16) is provided in the valve core adjustment groove (15). The sealing cover (16) is threadedly connected to the side wall of the valve core adjustment groove (15), and a sealing ring is provided between the sealing cover (16) and the side wall of the valve core adjustment groove (15).

5. The stable output flow regulating valve according to claim 2, characterized in that... The radial connecting holes (412) are provided in multiple locations. The multiple radial connecting holes (412) are located at different circumferential positions in the flow ring groove (42) and extend into the interior of the valve core (4) to communicate with the axial throttling hole (411).

6. The stable output flow regulating valve according to claim 5, characterized in that... There are two fluid output ports (13), which are located at different positions around the valve seat (1). Each fluid output port (13) is connected to the valve hole (11) through the output communication hole (131), and the output communication hole (131) is opposite to the flow ring groove (42).

7. The stable output flow regulating valve according to any one of claims 1-6, characterized in that... It also includes a pressure ring (6), which is sleeved on the valve cover (2) and threadedly connected to the valve seat (1) so as to press and fix the valve cover (2) on the valve seat (1). The valve cover (2) and the valve seat (1) are provided with cavity grooves at their relative positions. The diaphragm (3) is disposed between the valve cover (2) and the valve seat (1).

8. The stable output flow regulating valve according to claim 7, characterized in that... The distance between the diaphragm (3) and the outlet of the first throttling channel (14) is less than the diameter of the first throttling channel (14), and the distance between the diaphragm (3) and the end of the valve core (4) is less than the diameter of the second throttling channel (41).

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