Micro-flow gas regulating valve

Abstract

The utility model discloses a micro-flow gas regulating valve which comprises a valve body, the valve body comprises an inlet and an outlet, a valve seat is arranged between the inlet and the outlet of the valve body, a valve rod is connected in the valve body in a sliding mode, the valve rod comprises a communicating rod connected in the valve seat in a sliding mode, the communicating rod is provided with a communicating flow channel, and the communicating flow channel is communicated with the valve seat. A plurality of throttling holes are formed in the communicating flow channel, the communicating flow channel is communicated with the outlet, a driving unit is connected to the side, away from the communicating rod, of the valve rod, and the driving unit can drive the valve rod to move to the throttling holes to be communicated with the inlet. The utility model provides a micro-flow gas regulating valve which can improve the control precision of micro-flow and realize accurate regulation of the flow, and the precision is higher.

Description

Technical Field

[0001] This utility model relates to the field of regulating valve technology, and in particular to a micro-flow gas regulating valve. Background Technology

[0002] For example, publication number "CN119244762A" discloses "a large-diameter, low-pressure-loss molten lead-bismuth alloy flow regulating valve," which includes a valve body and a cover plate. The cover plate is equipped with an electrically controlled pumping component and an elastic compression structure. Two rotating arms are rotatably connected to the outside of the square seat, and a driving component is provided on the square seat. A control component for adjusting the position of the slider is provided in the square seat, and an elastic locking structure is fitted on the cover plate and the sliding arms. However, in practical applications, this type of flow regulating valve cannot achieve precise control of minute flow rates; it can only control opening and closing in a simple manner, resulting in low accuracy. Summary of the Invention

[0003] In view of the problem mentioned in the background art that the existing technology has low flow control accuracy and cannot control small flow rates, this utility model provides a small flow gas regulating valve that can improve the control accuracy of small flow rates, achieve precise flow regulation, and has high precision.

[0004] To achieve the above objectives, the present invention adopts the following technical solution.

[0005] A micro-flow gas regulating valve includes a valve body with an inlet and an outlet. A valve seat is disposed between the inlet and the outlet. A valve stem is slidably connected within the valve body. The valve stem includes a connecting rod slidably connected within the valve seat. A connecting passage is disposed on the connecting rod. A throttling orifice is disposed on the connecting passage. The connecting passage is connected to the outlet. A drive unit is connected to the side of the valve stem away from the connecting rod. The drive unit can drive the valve stem to move until the throttling orifice connects with the inlet.

[0006] In the field of fluid control technology, flow control valves, as core actuators in pipeline systems, directly affect the process control performance in scenarios such as industrial automation and precision instruments due to their adjustment accuracy. Currently, conventional control valves generally adopt a mechanical opening adjustment structure. Due to limitations in the valve body structure and the coordination method of the transmission mechanism, the following technical defects exist in practical applications: First, the nonlinear relationship between valve core stroke and flow rate change makes it difficult for operators to accurately predict the flow adjustment range through manual or electric actuators, especially in the low flow range where step-like changes in flow are prone to occur.

[0007] Therefore, this application abandons the structure that directly opens or closes the connection between the inlet and outlet through the movement of the valve stem. Instead, a connecting rod is provided at the end of the valve stem, and a connecting flow channel is provided on the connecting rod. The connecting flow channel is connected to a throttling orifice. Multiple throttling orifices are provided. When the valve stem moves up and down, it can drive the connecting rod to move synchronously. Since the connecting rod is located inside the valve seat, during use, the throttling orifice moves to the inlet position with the movement of the valve stem. The throttling orifice is connected to the connecting flow channel. Therefore, during operation, the fluid at the inlet will enter the connecting flow channel through the throttling orifice and then enter the outlet through the connecting flow channel. Since there are multiple throttling orifices on the connecting rod, the number of throttling orifices connected to the inlet increases or decreases as the valve stem moves, thereby enabling precise control of the flow rate increase or decrease. The flow rate control is digitized, improving the accuracy of control.

[0008] Preferably, the valve seat is provided with a sliding groove, which is slidably connected to the connecting rod. The sliding groove inside the valve seat guides the movement of the connecting rod through its sliding connection with the connecting rod. Furthermore, because the sliding connection between the groove and the connecting rod ensures a relatively sealed state during operation, guaranteeing that intake air can only flow from the throttling orifice through the connecting channel to the outlet, thus achieving precise fluid control.

[0009] Preferably, the valve seat has a sealing groove, and a sealing ring is installed in the sealing groove, with the sealing ring fitting against the connecting rod. The sealing groove within the valve seat, and the sealing ring installed on it, allows for a tight seal between the connecting rod and the valve seat, preventing fluid leakage from any gaps.

[0010] Preferably, the sealing ring has a rigid skeleton inside, and the sealing ring includes a soft rubber ring fitted onto the outside of the rigid skeleton. The rigid skeleton inside the sealing ring and the soft rubber ring outside the rigid skeleton, through the combination of the soft rubber ring and the rigid skeleton, enable the sealing ring to have good resilience and fit, thereby improving the sealing performance of the sealing ring.

[0011] Preferably, the sealing ring has a U-shaped cross-section, with the U-shaped opening facing the inlet side. The U-shaped cross-sectional area of ​​the sealing ring provides better springback, ensuring a tight fit between the sealing ring and the connecting rod.

[0012] Preferably, the density of the throttling orifices on the connecting rod is increased along the direction from the inlet to the outlet. The density of the throttling orifices is not uniform; by arranging them more densely on the side near the outlet and more sparsely on the side near the inlet, the flow rate can be progressively increased as the connecting rod moves towards the inlet, resulting in an exponential increase in flow rate. This avoids the problem of not being able to start quickly when a higher flow rate is required, and improves the smoothness of the flow control valve.

[0013] Preferably, the drive unit is a pneumatic actuator.

[0014] Preferably, the connecting rod has a guide surface at the end furthest from the drive unit. This guide surface allows for control over the smoothness of the connection between the connecting rod and the slide groove during valve stem installation, thus facilitating assembly.

[0015] Preferably, a valve cover is connected to the valve body, the valve cover is slidably connected to the valve stem, and packing is provided between the valve cover and the valve stem. By providing packing between the valve cover and the valve stem, the sealing of the connection between the valve stem and the valve cover is ensured, while also ensuring the smooth movement of the valve stem.

[0016] Preferably, the throttling orifices are uniformly arranged circumferentially along the connecting rod at the same axial position. By uniformly arranging the throttling orifices circumferentially, fluid can enter the connecting channel evenly from all sides, improving the flow stability and uniformity of the fluid.

[0017] The beneficial effects of this utility model are as follows:

[0018] (1) It can improve the control accuracy of small flow rates and achieve precise flow rate adjustment with high accuracy;

[0019] (2) It has a higher degree of freedom in adjusting the flow rate, and can quickly switch between small flow rate control and large flow rate control. The growth curve of the flow rate control is exponential, and the range of flow rate adjustment is larger. Attached Figure Description

[0020] Figure 1 This is an overall sectional view of the present invention.

[0021] Figure 2 yes Figure 1 Sectional view at point A in the middle.

[0022] Figure 3 yes Figure 1 A partial sectional view at point A in the middle.

[0023] In the picture:

[0024] 1 Valve body, 11 Inlet, 12 Outlet;

[0025] 2. Valve seat; 21. Slide groove; 22. Sealing groove; 23. Sealing ring;

[0026] 3 valve stem, 31 connecting rod, 311 guide surface, 32 connecting flow channel, 33 throttling orifice;

[0027] 4 drive units;

[0028] 5. Valve cover, 51. Packing. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0030] Example 1:

[0031] like Figure 1 , 2 As shown, a micro-flow gas regulating valve includes a valve body 1, which includes an inlet 11 and an outlet 12. A valve seat 2 is provided between the inlet 11 and the outlet 12. A valve stem 3 is slidably connected inside the valve body 1. The valve stem 3 includes a connecting rod 31 slidably connected inside the valve seat 2. A connecting flow channel 32 is provided on the connecting rod 31. A throttling orifice 33 is provided on the connecting flow channel 32. The connecting flow channel 32 is connected to the outlet 12. A drive unit 4 is connected to the side of the valve stem 3 away from the connecting rod 31. The drive unit 4 can drive the valve stem 3 to move until the throttling orifice 33 is connected to the inlet 11.

[0032] In the field of fluid control technology, flow control valves, as core actuators in pipeline systems, directly affect the process control performance in scenarios such as industrial automation and precision instruments due to their adjustment accuracy. Currently, conventional control valves generally adopt a mechanical opening adjustment structure. However, due to limitations in the valve body structure and the coordination method of the transmission mechanism, the following technical defects exist in practical applications: First, the nonlinear relationship between valve core stroke and flow rate change makes it difficult for operators to accurately predict the flow adjustment range through manual or electric actuators, especially in the low flow range where step-like changes in flow are prone to occur.

[0033] Secondly, due to insufficient machining precision of the valve seat 2 sealing surface and insufficient matching of the return spring stiffness, internal leakage of the medium or valve core vibration is prone to occur when performing micron-level opening adjustment. Thirdly, the traditional combination design of a conical valve core and a V-shaped opening cannot form a stable laminar flow state under low Reynolds number conditions, resulting in flow pulsation or flow interruption during minute flow adjustments. These problems directly lead to existing equipment failing to meet the stability requirements of micro-level flow control in emerging fields such as biopharmaceutical micro-infusion and semiconductor wet etching. Furthermore, long-term, high-frequency fine-tuning conditions easily accelerate seal wear, severely affecting the equipment's service life.

[0034] The limitations of the valve core guiding structure further exacerbate the decline in adjustment accuracy. Traditional V-type or conical valve cores typically rely on the sliding fit between the valve stem 3 and the packing 51 for guidance. During long-term operation, wear of the sealing packing 51 leads to an increase in the radial oscillation amplitude of the valve core. During minute adjustments, this oscillation causes fluctuations in the local contact force between the valve port edge and the sealing surface of the valve seat 2, resulting in intermittent internal leakage. More seriously, when the medium contains fine particulate matter, the non-uniform wear between the valve core and the valve seat 2 creates irregular leakage channels, causing the flow stability at low opening degrees to deteriorate exponentially with prolonged use.

[0035] Therefore, in this application, the structure that directly opens or closes the connection between the inlet 11 and the outlet 12 through the movement of the valve stem 3 is abandoned. Instead, a connecting rod 31 is provided at the end of the valve stem 3, and a connecting flow channel 32 is provided on the connecting flow channel 31. A throttling orifice 33 is connected to the connecting flow channel 32. Multiple throttling orifices 33 are provided. When the valve stem 3 moves up and down, it can drive the connecting rod 31 to move synchronously. Since the connecting rod 31 is located inside the valve seat 2, the connecting rod 31 moves with the valve stem 3 during use. The throttling orifice 33 will move to the inlet 11 position, and the throttling orifice 33 will be connected to the connecting channel 32. Therefore, during operation, the fluid at the inlet 11 will enter the connecting channel 32 through the throttling orifice 33 and then enter the outlet 12 through the connecting channel 32. Since there are several throttling orifices 33 on the connecting rod 31, as the valve rod 3 moves, the number of connections between the throttling orifice 33 and the inlet 11 increases or decreases, thereby enabling precise control of the flow rate increase or decrease, digitizing the flow rate control, and improving the accuracy of control.

[0036] Example 2:

[0037] like Figure 1 , 2 As shown, a micro-flow gas regulating valve includes a valve body 1, which includes an inlet 11 and an outlet 12. A valve seat 2 is provided between the inlet 11 and the outlet 12. A valve stem 3 is slidably connected inside the valve body 1. The valve stem 3 includes a connecting rod 31 slidably connected inside the valve seat 2. A connecting flow channel 32 is provided on the connecting rod 31. A throttling orifice 33 is provided on the connecting flow channel 32. The connecting flow channel 32 is connected to the outlet 12. A drive unit 4 is connected to the side of the valve stem 3 away from the connecting rod 31. The drive unit 4 can drive the valve stem 3 to move until the throttling orifice 33 is connected to the inlet 11.

[0038] like Figure 2As shown, a sliding groove 21 is provided inside the valve seat 2, and the sliding groove 21 is slidably connected to the connecting rod 31. The sliding groove 21 inside the valve seat 2 guides the movement of the connecting rod 31 through the sliding connection between the sliding groove 21 and the connecting rod 31. At the same time, since the sliding connection between the sliding groove 21 and the connecting rod 31 is the sliding connection, the sliding groove 21 and the connecting rod 31 can be in a relatively sealed state during operation, thereby ensuring that the intake air can only flow into the outlet 12 from the throttling orifice 33 through the connecting flow channel 32, thus achieving precise control of the fluid.

[0039] like Figure 2 As shown, a sealing groove 22 is provided inside the valve seat 2, and a sealing ring 23 is provided inside the sealing groove 22. The sealing ring 23 fits against the connecting rod 31. The sealing groove 22 inside the valve seat 2, and the sealing ring 23 installed on the sealing groove 22 can fit against the connecting rod 31, thereby achieving a sealing effect between the connecting rod 31 and the valve seat 2 and preventing fluid leakage from the gap.

[0040] A rigid skeleton is provided inside the sealing ring 23, and the sealing ring 23 includes a soft rubber ring that fits onto the outside of the rigid skeleton. The rigid skeleton inside the sealing ring 23 and the soft rubber ring on the outside of the rigid skeleton, through the combination of the soft rubber ring and the rigid skeleton, enable the sealing ring 23 to have good resilience and fit, thereby improving the sealing performance of the sealing ring 23.

[0041] like Figure 2 As shown, the sealing ring 23 has a U-shaped cross-section, with the U-shaped opening facing the inlet 11. The U-shaped cross-sectional area of ​​the sealing ring 23 provides better springback and ensures a tight fit between the sealing ring 23 and the connecting rod 31.

[0042] like Figure 1 As shown, drive unit 4 is a pneumatic actuator.

[0043] like Figure 2 As shown, the connecting rod 31 has a guide surface 311 at the end away from the drive unit 4. The guide surface 311 at the end of the connecting rod 31 away from the drive unit 4 allows for control over the smoothness of the connection between the connecting rod 31 and the slide groove 21 during the installation of the valve stem 3, thus facilitating assembly.

[0044] like Figure 1 As shown, a valve cover 5 is connected to the valve body 1, and the valve cover 5 is slidably connected to the valve stem 3. A packing 51 is provided between the valve cover 5 and the valve stem 3. By providing the packing 51 between the valve cover 5 and the valve stem 3, the sealing of the connection between the valve stem 3 and the valve cover 5 is ensured, while also ensuring the smooth movement of the valve stem 3.

[0045] like Figure 2 As shown, at the same axial position of the connecting rod 31, the throttling orifices 33 are uniformly arranged along the circumferential direction of the connecting rod 31. By uniformly arranging the throttling orifices 33 in the circumferential direction, the fluid can enter the connecting channel 32 uniformly from all sides, thereby improving the flow stability and uniformity of the fluid.

[0046] In the field of fluid control technology, flow control valves, as core actuators in pipeline systems, directly affect the process control performance in scenarios such as industrial automation and precision instruments due to their adjustment accuracy. Currently, conventional control valves generally adopt a mechanical opening adjustment structure. However, due to limitations in the valve body structure and the coordination method of the transmission mechanism, the following technical defects exist in practical applications: First, the nonlinear relationship between valve core stroke and flow rate change makes it difficult for operators to accurately predict the flow adjustment range through manual or electric actuators, especially in the low flow range where step-like changes in flow are prone to occur.

[0047] Secondly, due to insufficient machining precision of the valve seat 2 sealing surface and insufficient matching of the return spring stiffness, internal leakage of the medium or valve core vibration is prone to occur when performing micron-level opening adjustment. Thirdly, the traditional combination design of a conical valve core and a V-shaped opening cannot form a stable laminar flow state under low Reynolds number conditions, resulting in flow pulsation or flow interruption during minute flow adjustments. These problems directly lead to existing equipment failing to meet the stability requirements of micro-level flow control in emerging fields such as biopharmaceutical micro-infusion and semiconductor wet etching. Furthermore, long-term, high-frequency fine-tuning conditions easily accelerate seal wear, severely affecting the equipment's service life.

[0048] The limitations of the valve core guiding structure further exacerbate the decline in adjustment accuracy. Traditional V-type or conical valve cores typically rely on the sliding fit between the valve stem 3 and the packing 51 for guidance. During long-term operation, wear of the sealing packing 51 leads to an increase in the radial oscillation amplitude of the valve core. During minute adjustments, this oscillation causes fluctuations in the local contact force between the valve port edge and the sealing surface of the valve seat 2, resulting in intermittent internal leakage. More seriously, when the medium contains fine particulate matter, the non-uniform wear between the valve core and the valve seat 2 creates irregular leakage channels, causing the flow stability at low opening degrees to deteriorate exponentially with prolonged use.

[0049] Therefore, in this application, the structure that directly opens or closes the connection between the inlet 11 and the outlet 12 through the movement of the valve stem 3 is abandoned. Instead, a connecting rod 31 is provided at the end of the valve stem 3, and a connecting flow channel 32 is provided on the connecting flow channel 31. A throttling orifice 33 is connected to the connecting flow channel 32. Multiple throttling orifices 33 are provided. When the valve stem 3 moves up and down, it can drive the connecting rod 31 to move synchronously. Since the connecting rod 31 is located inside the valve seat 2, the connecting rod 31 moves with the valve stem 3 during use. The throttling orifice 33 will move to the inlet 11 position, and the throttling orifice 33 will be connected to the connecting channel 32. Therefore, during operation, the fluid at the inlet 11 will enter the connecting channel 32 through the throttling orifice 33 and then enter the outlet 12 through the connecting channel 32. Since there are several throttling orifices 33 on the connecting rod 31, as the valve rod 3 moves, the number of connections between the throttling orifice 33 and the inlet 11 increases or decreases, thereby enabling precise control of the flow rate increase or decrease, digitizing the flow rate control, and improving the accuracy of control.

[0050] In this embodiment, the above-described structural configuration improves the control precision for small flow rates, enabling accurate flow rate adjustment with high precision. Simultaneously, it provides greater freedom in flow rate adjustment, allowing for rapid switching between small and large flow rate control. The flow rate control growth curve exhibits exponential growth, resulting in a wider range of flow rate adjustments.

[0051] Example 3:

[0052] like Figure 1 , 2 As shown, unlike in Embodiment 2, this embodiment discloses a micro-flow gas regulating valve, including a valve body 1, which includes an inlet 11 and an outlet 12. A valve seat 2 is provided between the inlet 11 and the outlet 12 in the valve body 1. A valve stem 3 is slidably connected inside the valve body 1. The valve stem 3 includes a connecting rod 31 slidably connected inside the valve seat 2. A connecting flow channel 32 is provided on the connecting rod 31. A throttling orifice 33 is provided on the connecting flow channel 32. The connecting flow channel 32 is connected to the outlet 12. A drive unit 4 is connected to the side of the valve stem 3 away from the connecting rod 31. The drive unit 4 can drive the valve stem 3 to move until the throttling orifice 33 is connected to the inlet 11.

[0053] like Figure 3As shown, the density of the throttling orifices 33 on the connecting rod 31 increases along the direction from the inlet 11 to the outlet 12. The density of the throttling orifices 33 is not uniform. By arranging the throttling orifices 33 more densely on the side closer to the outlet 12 and more sparsely on the side closer to the inlet 11, the flow rate can be progressively increased as the connecting rod 31 moves towards the inlet 11, resulting in an exponential increase in flow rate. This avoids the problem of not being able to start quickly when a higher flow rate is required, thus improving the smoothness of the flow control valve.

Claims

1. A micro-flow gas regulating valve, characterized in that, The valve includes a valve body with an inlet and an outlet. A valve seat is provided between the inlet and the outlet. A valve stem is slidably connected inside the valve body. The valve stem includes a connecting rod slidably connected inside the valve seat. A connecting flow channel is provided on the connecting rod. A throttling orifice is provided on the connecting flow channel. The connecting flow channel is connected to the outlet. A drive unit is connected to the side of the valve stem away from the connecting rod. The drive unit can drive the valve stem to move until the throttling orifice connects with the inlet.

2. The micro-flow gas regulating valve according to claim 1, characterized in that, The valve seat is provided with a sliding groove, which is slidably connected to the connecting rod.

3. A micro-flow gas regulating valve according to claim 1, characterized in that, The valve seat is provided with a sealing groove, and a sealing ring is provided in the sealing groove, which fits against the connecting rod.

4. A micro-flow gas regulating valve according to claim 3, characterized in that, The sealing ring has a rigid skeleton inside, and the sealing ring includes a soft rubber ring that is fitted onto the outside of the rigid skeleton.

5. A micro-flow gas regulating valve according to claim 3, characterized in that, The sealing ring has a U-shaped cross-section, and the U-shaped opening is positioned facing the inlet side.

6. A micro-flow gas regulating valve according to claim 1, characterized in that, Along the direction from the inlet to the outlet, the density of the throttling orifices on the connecting rod increases.

7. A micro-flow gas regulating valve according to claim 1, characterized in that, The drive unit is a pneumatic actuator.

8. A micro-flow gas regulating valve according to claim 1, characterized in that, The connecting rod has a guide surface at the end furthest from the drive unit.

9. A micro-flow gas regulating valve according to any one of claims 1-8, characterized in that, A valve cover is connected to the valve body, and the valve cover is slidably connected to the valve stem. Packing is provided between the valve cover and the valve stem.

10. A micro-flow gas regulating valve according to any one of claims 1-8, characterized in that, The throttling orifices are uniformly arranged along the circumferential direction of the connecting rod at the same axial position of the connecting rod.

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