Small-flow control regulating valve
By setting a specific ring groove structure on the valve seat hole and valve core of the small flow control valve, the liquid inlet cavity, adjustment cavity and liquid outlet cavity are formed, which solves the problems of large leakage and poor adjustability in high pressure difference and small flow conditions in the existing small flow control valve, which achieves accurate control of flow regulation and uniform stress of the valve core, and improves reliability.
Patent Information
- Application Number
- CN202422317202.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-23
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-09-23
AI Technical Summary
The existing small flow regulating valves have problems such as large leakage, poor adjustability, and even inability to adjust and control in high pressure and small flow conditions. The needle valve disc is prone to vibrating, deforming or breaking, which reduces reliability and accuracy of small flow control.
A small flow control regulating valve is designed. By setting a first ring groove and a second ring groove on the inner hole wall of the valve seat hole, and opening a throughflow ring groove on the surface of the valve core to form a liquid inlet cavity, adjustment cavity and outlet cavity. The flow rate of the adjustment cavity is changed by reciprocating movement of the valve core to achieve accurate control of flow regulation.
Accurate control of flow rate regulation is achieved, the pressure loss of fluid when passing through the valve is reduced, the force uniformity of the valve core is enhanced, the risks of vibration and deformation are avoided, and the reliability of the regulating valve is improved.
Smart Images
Figure CN223019446U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of regulating valves, in particular to a regulating valve for small flow control. Background Art
[0002] Regulating valves are mainly applied to the regulation of the flow rate, temperature and pressure of pipeline media in industrial automation process control. Among them, the regulation of small flow rate and tiny flow rate has always been a difficult point in industrial automation process control. Especially in the working conditions of high pressure difference and small flow rate, traditional regulating valves have problems such as large leakage, poor adjustability, and even inability to adjust and control.
[0003] To solve the above problems, a small-bore needle-shaped regulating valve is provided in the prior art, which achieves the multi-functional purposes of tiny flow rate regulation and on-off cutting through a small-bore needle-shaped flow-opening structure. However, when high-pressure fluid media enter the small-bore valve seat hole, the flow area decreases sharply, resulting in too high a flow velocity of the media and too large an impact on the valve flap. Especially when the needle-shaped valve flap just partially leaves the valve seat hole of the valve body (i.e., when the regulating valve is at a small opening), the risk of vibration, deformation or breakage of the needle-shaped valve flap is very high, reducing the reliability of the regulating valve and the accuracy of small flow rate control. Summary of the Utility Model
[0004] In view of this, the purpose of the utility model is to provide a regulating valve for small flow control, which solves the problems of insufficient accuracy and reliability in small flow rate control of regulating valves in the prior art.
[0005] The utility model solves the above technical problems through the following technical means: a regulating valve for small flow control, comprising a valve body and a valve cover connected to each other, a valve seat hole arranged in the valve body, a valve core arranged in the valve seat hole, the top of the valve core is connected with a valve rod driven by an actuator, the valve rod is used to drive the valve core to reciprocate, the valve body includes an inlet and an outlet arranged on both sides of the valve body, the inner hole wall of the valve seat hole is successively provided with a first annular groove and a second annular groove from top to bottom, a liquid inlet cavity is formed by communicating between the first annular groove and the inlet, a liquid outlet cavity is formed by communicating between the second annular groove and the outlet, an over-flow annular groove is arranged on the surface of the valve core, an adjustment cavity is formed between the over-flow annular groove and the inner hole wall of the valve seat hole, the width of the over-flow annular groove is greater than the distance between the first annular groove and the second annular groove, and the flow rate of the adjustment cavity changes with the reciprocating movement of the valve core.
[0006] Optionally, the widths of the first annular groove and the second annular groove are equal, so that the maximum flow areas of the adjustment cavity and the inlet of the liquid outlet cavity are the same.
[0007] Optionally, a valve sleeve is arranged between the valve rod and the valve cover, and the valve sleeve is in sliding sealing fit with the valve rod. The valve sleeve plays a role in assisting the transmission of the valve rod and avoiding direct contact between the valve rod and the valve body and the valve cover.
[0008] Optionally, the valve sleeve is threadedly connected to the valve body, making the valve sleeve detachable and facilitating replacement.
[0009] Optionally, a packing seal layer is provided between the valve sleeve and the valve stem. The setting of the packing seal layer further enhances the sealing performance of the valve stem.
[0010] Optionally, the length of the bottom cylindrical section of the valve core is greater than or equal to the depth of the valve seat hole below the second annular groove, and the maximum displacement stroke of the valve core is less than the depth of the valve seat hole below the second annular groove. This prevents the medium flowing through the regulating valve from entering the bottom of the valve seat hole and reduces the influence of the displacement of the valve core.
[0011] Optionally, a pressure relief channel is provided at the bottom of the valve seat hole. This prevents a sealed cavity from forming between the bottom of the valve seat hole and the bottom of the valve core and reduces interference with the displacement of the valve core.
[0012] Advantages of the present utility model:
[0013] 1. In the present utility model, a first annular groove and a second annular groove are successively formed in the inner hole wall of the valve seat hole from top to bottom, an overflow annular groove is formed on the surface of the valve core, and the cooperation between the valve core and the valve seat hole forms a liquid inlet cavity, a regulating cavity, and a liquid outlet cavity. Since the width of the overflow annular groove is greater than the distance between the first annular groove and the second annular groove, by moving the overflow annular groove of the valve core relative to the valve seat hole and cooperating with the first annular groove and the second annular groove of the valve seat hole, the flow rate of the regulating cavity changes with the reciprocating movement of the valve core, achieving accurate control of flow regulation. At the same time, when the regulating valve is fully opened, the overflow annular groove of the valve core cannot completely cover the first annular groove, which makes the actual flow area entering the regulating cavity slightly smaller than the actual flow area entering the liquid outlet cavity, so as to reduce the pressure loss when the fluid passes through the valve.
[0014] 2. Through the cooperative setting of the valve core and the valve seat hole in the present utility model, the cross-section of the valve core is relatively large. Compared with the risk of vibration, deformation, or breakage of the needle-shaped valve flap in the prior art, due to the setting of the overflow annular groove in the valve core of the present utility model, when the valve opening is small, the flowing fluid medium impacts the bottom of the groove in a circumferential and all-directional manner, making the force on the valve core uniform and avoiding risks such as vibration, thus greatly enhancing the reliability. Description of the Drawings
[0015] Figure 1 is a structural schematic diagram of the present utility model;
[0016] Figure 2 is a partial sectional view of the regulating valve of the present utility model when it is fully opened;
[0017] Figure 3 is a partial sectional view of the regulating valve of the present utility model when it is fully closed.
[0018] Among them, 1 - valve body, 11 - valve seat hole, 111 - first annular groove, 112 - second annular groove, 12 - inlet, 13 - outlet, 2 - valve cover, 3 - valve core, 31 - flow - through annular groove, 4 - valve stem, 5 - valve sleeve. Specific embodiments
[0019] The following specific embodiments are used to illustrate the implementation manners of the present utility model. Those skilled in the art can understand the advantages and effects of the present utility model from the content disclosed in this specification. It should be noted that the drawings provided in the following embodiments are only for illustrative purposes, showing only schematic diagrams rather than physical diagrams, and should not be construed as limiting the present utility model. To better illustrate the embodiments of the present utility model, some components in the drawings will be omitted, enlarged or reduced, which do not represent the dimensions of the actual products; for those skilled in the art, it is understandable that some well - known structures and their descriptions in the drawings may be omitted.
[0020] In the drawings of the embodiments of the present utility model, the same or similar reference numerals correspond to the same or similar components. In the description of the present utility model, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc. indicating the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings. This is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only for illustrative purposes and should not be construed as limiting the present utility model. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.
[0021] As Figures 1 - 3 shown, a small - flow - control regulating valve of the present utility model includes a connected valve body 1 and valve cover 2, a valve seat hole 11 provided in the valve body 1, and a valve core 3 provided in the valve seat hole 11. The top of the valve core 3 is connected to a valve stem 4 driven by an actuator, and the valve stem 4 is used to drive the valve core 3 to reciprocate. It can be understood that the valve core 3 is in sliding - seal fit with the valve seat hole 11 to avoid liquid leakage.
[0022] The valve body 1 includes an inlet 12 and an outlet 13 provided on both sides of the valve body 1. The inner wall of the valve seat hole 11 is successively provided with a first annular groove 111 and a second annular groove 112 from top to bottom. A liquid - inlet cavity is formed by the connection between the first annular groove 111 and the inlet 12, and a liquid - outlet cavity is formed by the connection between the second annular groove 112 and the outlet 13. A flow - through annular groove 31 is provided on the surface of the valve core 3. An adjustment cavity is formed between the flow - through annular groove 31 and the inner wall of the valve seat hole 11. The width of the flow - through annular groove 31 is greater than the distance between the first annular groove 111 and the second annular groove 112, and the flow rate of the adjustment cavity changes with the reciprocating movement of the valve core 3.
[0023] In this embodiment, the widths of the first annular groove 111 and the second annular groove 112 are equal, such that the maximum flow areas at the inlets of the regulating chamber and the liquid outlet chamber are the same. At the same time, as Figure 2 shown, when the regulating valve is fully opened, the flow-through annular groove 31 of the valve core 3 cannot completely cover the first annular groove 111, which makes the actual flow area entering the regulating chamber slightly smaller than the actual flow area entering the liquid outlet chamber, so as to reduce the pressure loss when the fluid passes through the valve.
[0024] In this embodiment, a valve sleeve 5 is provided between the valve stem 4 and the valve cover 2. The valve sleeve 5 is in sliding sealing fit with the valve stem 4. The valve sleeve 5 plays a role in assisting the transmission of the valve stem 4 to prevent the valve stem 4 from directly contacting the valve body 1 and the valve cover 2. The valve sleeve 5 is threadedly connected to the valve body 1, making the valve sleeve detachable and convenient for replacement. A packing sealing layer is provided between the valve sleeve 5 and the valve stem 4. The packing can be a fabric packing such as polytetrafluoroethylene, providing good corrosion resistance and high temperature resistance, and being suitable for high temperature and high pressure working environments. The setting of the packing sealing layer further enhances the sealing performance of the valve stem 4 and can increase the service life of the regulating valve. A packing gasket is usually further provided at the top of the packing sealing layer to make the force on the packing sealing layer uniform.
[0025] In this embodiment, the length of the bottom cylindrical section of the valve core 3 is greater than or equal to the depth of the valve seat hole 11 below the second annular groove 112, and the maximum displacement stroke of the valve core 3 is less than the depth of the valve seat hole 11 below the second annular groove 112. This makes it so that the bottom cylindrical section of the valve core 3 does not break away from the depth range of the valve seat hole 11 below the second annular groove 112, preventing the fluid medium flowing through the regulating valve from entering the bottom of the valve seat hole 11, reducing the influence of the displacement of the valve core 3, and avoiding fluid medium leakage.
[0026] In this embodiment, a pressure relief channel is provided at the bottom of the valve seat hole 11. The pressure relief channel is used to balance the air pressure at the bottom of the valve seat hole 11, preventing a sealed cavity from being formed between the bottom of the valve seat hole 11 and the bottom of the valve core 3 and reducing the interference with the displacement of the valve core 3.
[0027] It can be understood that in this embodiment, there are also some conventional settings that are not described, such as a flange for sealing is provided between the valve body 1 and the valve cover 2, and a gasket is provided between the valve body 1 and the valve sleeve 5. Also, for example, the actuator rotates through a handwheel, and the displacement of the valve stem 4 is manually adjusted through bevel gears and screws. In some other embodiments, the actuator can also drive the valve stem 4 to achieve displacement through other existing methods such as pneumatic or motor.
[0028] The working principle of the present utility model is as follows:
[0029] When using the regulating valve of the present utility model, the fluid medium enters the liquid inlet cavity through the inlet 12, enters the regulating cavity through the first annular groove 111, enters the liquid outlet cavity through the second annular groove 112, and flows out from the outlet 13. During this process, the relative displacement change of the valve core 3 is utilized to adjust the flow area of each cavity, thereby controlling the flow rate.
[0030] Specifically, when the valve core 3 starts to move downward from the closed state as Figure 3 shown, when the flow-through annular groove 31 starts to overlap with the area of the second annular groove 112, the flow area of the liquid outlet cavity rapidly starts to increase, and the increase in the flow rate is positively correlated with the value of the downward displacement of the valve core 3. Therefore, precise control of the flow rate can be achieved until as Figure 2 shown, the regulating valve is in a fully open state. At this time, the flow area of the liquid outlet cavity reaches the maximum. Since the flow-through annular groove 31 of the valve core 3 cannot completely cover the first annular groove 111, the actual flow area entering the regulating cavity is slightly smaller than the actual flow area entering the liquid outlet cavity, so as to reduce the pressure loss when the fluid passes through the valve.
[0031] In addition, due to the setting of the flow-through annular groove 31 on the valve core 3, when the valve opening is small, the fluid medium passing through impacts the bottom of the groove in a circumferential all-directional manner, making the force on the valve core 3 uniform, and there will be no risk of vibration such as that generated by the valve flap of the small-diameter needle-shaped regulating valve in the prior art. Therefore, the reliability is enhanced.
[0032] The above embodiments are only used to illustrate the technical solutions of the present utility model and not to limit them. Although the present utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present utility model can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present utility model, and they should all be covered within the scope of the claims of the present utility model. The technologies, shapes, and structures not described in detail in the present utility model are all well-known technologies.
Claims
1. A small flow control regulating valve, comprising a valve body (1) and a valve cover (2) connected to each other, a valve seat hole (11) provided in the valve body (1), and a valve core (3) provided in the valve seat hole (11), the top of the valve core (3) being connected to a valve stem (4) driven by an actuator, the valve stem (4) being used to drive the valve core (3) to reciprocate, and characterized in that: The valve body (1) comprises an inlet (12) and an outlet (13) arranged on both sides of the valve body (1); the inner hole wall of the valve seat hole (11) is provided with a first annular groove (111) and a second annular groove (112) in sequence from top to bottom; the first annular groove (111) and the inlet (12) are connected to form a liquid inlet cavity; the second annular groove (112) and the outlet (13) are connected to form a liquid outlet cavity; the surface of the valve core (3) is provided with an overflow annular groove (31); an adjustment cavity is formed between the overflow annular groove (31) and the inner hole wall of the valve seat hole (11); the width of the overflow annular groove (31) is greater than the distance between the first annular groove (111) and the second annular groove (112); the flow rate of the adjustment cavity varies with the reciprocating movement of the valve core (3).
2. The small flow control regulating valve according to claim 1 is characterized in that: The first annular groove (111) and the second annular groove (112) have the same width.
3. The small flow control regulating valve according to claim 2 is characterized in that: A valve sleeve (5) is provided between the valve stem (4) and the valve cover (2), and the valve sleeve (5) and the valve stem (4) are slidably sealed.
4. The small flow control regulating valve according to claim 3 is characterized in that: The valve sleeve (5) is threadedly connected to the valve body (1).
5. The small flow control regulating valve according to claim 3 is characterized in that: A packing sealing layer is provided between the valve sleeve (5) and the valve stem (4).
6. The small flow control regulating valve according to claim 1 is characterized in that: The length of the bottom cylindrical section of the valve core (3) is greater than or equal to the depth of the valve seat hole (11) below the second annular groove (112), and the maximum displacement stroke of the valve core (3) is less than the depth of the valve seat hole (11) below the second annular groove (112).
7. The small flow control regulating valve according to claim 6, characterized in that: A pressure relief channel is provided at the bottom of the valve seat hole (11).