High-pressure-difference small-flow regulating valve
By designing flow control grooves and oblique surfaces in the regulating valve, the problems of inaccurate flow control and vibration noise in existing regulating valves are solved, realizing multi-stage precise regulation of fluid flow and structural stability.
Patent Information
- Application Number
- CN202423241058.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-26
- Publication Date
- 2025-10-24
- Estimated Expiration
- 2034-12-26
AI Technical Summary
Existing control valves are difficult to use for precise or minute flow regulation, and they also suffer from severe fluid erosion, leading to vibration and noise problems.
A high-pressure differential low-flow regulating valve was designed. By setting a flow control groove group on the peripheral wall of the valve core, including a flow slowing section, a flow boosting section and a constant flow section, combined with the valve cage and the flow control ring, the linear movement of the valve core relative to the valve cage is realized, and the multi-stage precise regulation of the fluid flow rate is controlled. Furthermore, erosion and noise are reduced by using oblique surfaces and staggered distribution.
It achieves multi-stage precise control of fluid flow, reduces vibration and noise, and improves structural stability and service life.
Smart Images
Figure CN223469779U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of governing valve, more particularly to a high pressure difference small flow governing valve. BACKGROUND
[0002] The governing valve is a kind of device for changing the throughput of gas or liquid and achieving certain needs, belongs to a kind of precision control instrument, usually by a master device and other auxiliary components. It only needs to accept the signal from regulating instrument to realize the switching action, so as to achieve the desired purpose. The governing valve is mainly used in the control of measured parameters such as pressure, liquid level and temperature in the automatic control of industrial production process, and can also be used in remote continuous monitoring system and computer control system as intermediate relay. It plays an important role in automatic regulation and control of fluid.
[0003] The existing governing valve adopts plunger type valve core and valve seat to form hard sealing as the way of blocking fluid flow. When the valve core moves away from the valve seat, the fluid changes from static state to flow state, and the fluid flow changes greatly, which cannot meet the accurate or small control of flow. Moreover, the fluid erosion to the valve internals is serious, and the large flow change will cause the vibration of valve internals and emit noise. SUMMARY
[0004] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a governing valve capable of realizing small flow regulation and stable structure.
[0005] To achieve the above purpose, the utility model provides the following technical scheme: a high pressure difference small flow governing valve, comprising a valve body, a valve core and a valve rod, the valve body is provided with an inlet channel, an outlet channel and a middle cavity connecting the inlet channel and the outlet channel and accommodating the valve core, a plurality of flow control groove groups distributed along the axis direction of the valve core are arranged on the peripheral wall of the valve core, each of the plurality of flow control groove groups comprises three flow control grooves distributed in a circle around the axis of the valve core, a valve cage is arranged in the middle cavity and sleeved on the valve core outside;
[0006] The groove bottom of the flow control groove towards the inner wall of the valve cage comprises a slow flow part, an increased flow part, a constant flow part and a reduced flow part, which are sequentially distributed along the direction of the valve core away from the valve rod and sequentially connected together, the slow flow part is inclined inwardly to the valve core, the increased flow part is inclined inwardly to the valve core and the inclination angle relative to the vertical plane is greater than that of the slow flow part, the constant flow part is parallel to the vertical plane, and the reduced flow part is inclined outwardly to the valve core relative to the constant flow part.
[0007] The valve cage inner wall is provided with a valve seat capable of forming a hard seal with the valve core, a flow control ring capable of being attached to the valve core peripheral wall and having the same number of groups as the flow control groove groups, and ring grooves between adjacent flow control rings and between the valve seat and adjacent flow control rings, wherein the ring grooves are one-to-one corresponding to the flow control groove groups, and the gap between the flow control ring and the valve core peripheral wall changes through linear movement of the valve core relative to the valve cage.
[0008] As a further improvement of the utility model, the adjacent flow control groove groups are distributed in a staggered manner in the circumferential direction of the valve core.
[0009] As a further improvement of the utility model, the end of the valve core not connected with the valve rod is provided with an extension passing through the valve seat and having a diameter smaller than that of the valve core, the peripheral wall of the extension is provided with two opposite chamfers, and the distance between the two chamfers decreases in the direction away from the valve core.
[0010] The utility model discloses the beneficial effects that the gap between the flow control ring and the valve core peripheral wall changes through linear movement of the valve core relative to the valve cage, so that the fluid flow through the flow control ring changes, and the single action of upward movement of the valve rod can realize multi-stage and accurate control of the fluid flow rate, achieving the purpose of micro-flow or small-flow control; compared with the design of the two different inclination angles of the slow-flow part and the flow-increasing part, only the design of the flow-increasing part can make the fluid speed and flow small during the initial opening, ensure that the fluid fills the ring groove inner cavity and provides stable outflow pressure for the fluid flowing into the outlet channel, stabilize the fluid flow rate, reduce the vibration and noise phenomenon during opening, and when the flow speed increases, the initial flow of the fluid makes the fluid flow sudden change small, further ensures that the fluid flow rate tends to be gentle, thereby reducing the possibility of vibration and noise. BRIEF DESCRIPTION OF DRAWINGS
[0011] Figure 1 It is the front view of the utility model when one flow control groove group is used;
[0012] Figure 2 It is the front view of the utility model when one flow control groove group is used; Figure 1 It is the enlarged view of A in the middle;
[0013] Figure 3 It is the perspective view of the utility model when only one flow control groove group is machined on the valve core;
[0014] Figure 4 It is the front view of the utility model when multiple flow control groove groups are used;
[0015] Figure 5 It is the front view of the utility model when multiple flow control groove groups are used; Figure 4 It is the enlarged view of B in the middle;
[0016] Figure 6The utility model discloses a plurality of flow control groove groups are arranged on the valve core.
[0017] Reference Signs: 1, valve body; 11, inlet channel; 12, outlet channel; 13, middle cavity; 2, valve core; 3, valve rod; 4, flow control groove group; 5, flow control groove; 51, slow flow part; 52, flow increasing part; 53, constant flow part; 54, flow decreasing part; 6, valve cage; 61, valve seat; 62, flow control ring; 63, ring groove; 7, extension part; 71, bevel surface. DETAILED DESCRIPTION
[0018] The utility model is further explained in detail below in combination with the drawings and examples. Same parts are indicated by same reference signs.
[0019] Reference Figures 1 to 6 As shown in the figure, the high-pressure-difference small-flow regulating valve of the embodiment comprises a valve body 1, a valve core 2 and a valve rod 3, the valve body 1 is provided with an inlet channel 11, an outlet channel 12 and a middle cavity 13 connecting the inlet channel 11 and the outlet channel 12 and accommodating the valve core 2;
[0020] Based on the foregoing prior art, a plurality of flow control groove groups 4 are arranged on the peripheral wall of the valve core 2 and distributed along the length direction of the valve core 2, for the convenience of description, the number of the flow control groove groups 4 is one, a circle is selected on the peripheral wall of the valve core 2 with the axis of the valve core 2 as the center line, three evenly distributed flow control grooves 5 are milled on the foregoing circle, the groove bottom of the flow control groove 5 comprises a slow flow part 51, a flow increasing part 52, a constant flow part 53 and a flow decreasing part 54 which are sequentially connected together and distributed along the length direction of the valve core 2, the constant flow part 53 is parallel to the vertical plane, the flow increasing part 52 and the flow decreasing part 54 are both inclined relative to the constant flow part 53 and the inclined directions are opposite, the slow flow part 51 is inclined to the inside of the valve core 2, the inclination angle of the flow increasing part 52 relative to the vertical plane is greater than the inclination angle of the slow flow part 51 relative to the vertical plane, the outer diameter of the valve cage 6 matches the inner diameter of the middle cavity 13, a valve seat 61, a flow control ring 62 and a ring groove 63 are arranged on the inner wall of the valve cage 6, the valve seat 61 and the flow control ring 62 are respectively located at the two ports of the valve cage 6, the ring groove 63 is located between the valve seat 61 and the flow control ring 62, the inner diameter of the flow control ring 62 matches the outer diameter of the valve core 2;
[0021] In the assembly process, the valve core 2 is fixedly connected with the valve stem 3 and the slow flow part 51 is adjacent to the valve stem 3, after the valve cage 6 is installed in place in the middle cavity 13, the valve core 2 is installed in the valve cage 6, in the initial state, the end edge of the valve core 2 is in contact with the valve seat 61 to form a hard seal, the inner wall of the flow control ring 62 is in contact with the outer surface of the valve core 2 and the one end of the slow flow part 51 is located in the inner cavity of the flow control ring 62, the three flow control grooves 5 are at the same height with the ring groove 63, in the process of moving the valve core 2 upward relative to the valve cage 6, the valve core 2 is separated from the valve seat 61, the slow flow part 51 passes through the inner cavity of the flow control ring 62, three gaps are formed between the three slow flow parts 51 and the flow control ring 62, the fluid flows into the ring groove 63 from the inlet channel 11 and flows upward, then the fluid flows through the three gaps and enters the outlet channel 12, at this time, the flow rate of the fluid flowing into the outlet channel 12 is small and the flow rate is small, as the valve core 2 continues to move upward, the slow flow part 51 completely passes through the flow control ring 62 and the flow increasing part 52 is inserted into the flow control ring 62, at this time, the flow rate of the fluid flowing into the outlet channel 12 increases rapidly and the flow rate becomes large, when the flow increasing part 52 completely passes through the flow control ring 62 and the constant flow part 53 is inserted into the flow control ring 62, at this time, the flow rate of the fluid flowing into the outlet channel 12 is zero and the flow rate is constant, when the constant flow part 53 completely passes through the flow control ring 62 and the flow decreasing part 54 is inserted into the flow control ring 62, at this time, the flow rate of the fluid flowing into the outlet channel 12 gradually decreases, until the connection between the valve stem 3 and the valve core 2 is in contact with the valve cover or the packing, then the valve stem 3 cannot continue to move upward;
[0022] Such design can realize multi-stage and accurate control of fluid flow rate through single action of upward movement of the valve stem 3, and achieve the purpose of micro flow or small flow control; compared with the design of different inclination angles of the slow flow part 51 and the flow increasing part 52, only the design of the flow increasing part 52 can realize small flow rate and small flow rate in the process of just opening, which can ensure that the fluid fills the inner cavity of the ring groove 63 and provides stable outflow pressure for the fluid flowing into the outlet channel 12, the fluid flow rate is stable, which can reduce the vibration and noise phenomenon generated during opening, and then when the flow rate increases, the fluid has initial flow rate, which makes the degree of sudden change of fluid flow rate small, further ensuring that the fluid flow rate tends to be gentle, thereby reducing the possibility of vibration and noise generation;
[0023] Further, the number of the flow control groove group 4, the flow control ring 62 and the ring groove 63 can be changed according to the length of the actual middle cavity 13, as the number of the flow control groove group 4 increases, the fluid flowing through the valve cage 6 can be controlled multiple times, thereby ensuring that the fluid flow rate tends to be stable during the flow process, further reducing the possibility of vibration and noise generation.
[0024] As an improved specific embodiment, refer to Figure 5 and Figure 6As shown, the number of the flow control groove groups 4 is at least two, and the adjacent flow control groove groups 4 are distributed in the circumferential direction of the valve core 2, so that the flow direction of the fluid flowing through the inner cavity of the valve cage 6 is changed, thereby reducing the erosion effect of the fluid on the flow control groove 5 and the flow control ring 62, ensuring the structural stability of the flow control ring 62 and the flow control groove 5 and prolonging the service life.
[0025] As an embodiment of the improvement, referring to Figure 3 and Figure 6 As shown, the end of the valve core 2 not connected with the valve rod 2 is provided with an extension 7 penetrating the valve seat 61 and having a diameter smaller than that of the valve core 2, and two opposite chamfers 71 are arranged on the peripheral wall of the extension 7, the distance between the two chamfers 71 decreases in the direction away from the valve core 2, and in the initial state, the valve core 2 forms a hard seal with the valve seat 61, and the extension 7 penetrates the inner cavity of the valve seat 61, and in the process of the valve core 2 moving away from the valve seat 61, the extension 7 moves upward with the valve core 2, the distance between the two chamfers 71 and the inner wall of the valve seat 61 gradually increases, and the flow rate of the fluid flowing through the valve seat 61 gradually increases, so that compared with the design without the extension 7 of the valve core 2, the fluid flowing through the valve seat 61 can be preliminarily controlled and the speed of the fluid can be controlled, thereby reducing the erosion degree of the sealing surfaces of the valve seat 61 and the valve core 2, and further improving the accuracy of the subsequent speed control of the fluid by the flow control ring 62 and the flow control groove 5.
[0026] The preferred embodiments of the utility model are described above, the protection scope of the utility model is not limited to the above-mentioned embodiments only, and any technical scheme belonging to the idea of the utility model belongs to the protection scope of the utility model. It should be noted that for ordinary technical personnel in the technical field, some improvements and decorations without departing from the principle of the utility model can also be considered as the protection scope of the utility model.
Claims
1. A high-pressure differential, low-flow regulating valve, comprising a valve body (1), a valve core (2), and a valve stem (3), wherein the valve body (1) is provided with an inlet channel (11), an outlet channel (12), and a central cavity (13) connecting the inlet channel (11) and the outlet channel (12) and accommodating the valve core (2), and characterized in that: The peripheral wall of the valve core (2) is provided with a plurality of flow control groove groups (4) distributed along the axis direction of the valve core (2), each of the plurality of flow control groove groups (4) includes three flow control grooves (5) distributed in a circle around the axis of the valve core (2), and the middle cavity (13) is provided with a valve cage (6) sleeved outside the valve core (2); The groove bottom of the flow control groove (5) towards the inner wall of the valve cage (6) includes a slow flow part (51), a flow increasing part (52), a constant flow part (53) and a flow decreasing part (54) distributed in turn along the direction of the valve core (2) away from the valve rod (3) and connected in turn, the slow flow part (51) is inclined inwardly to the valve core (2), the flow increasing part (52) is inclined inwardly to the valve core (2) and the inclination angle relative to the vertical plane is greater than that of the slow flow part (51), the constant flow part (53) is parallel to the vertical plane, and the flow decreasing part (54) is inclined outwardly to the valve core (2) relative to the constant flow part (53); The inner wall of the valve cage (6) is provided with a valve seat (61) capable of forming a hard seal with the valve core (2), a flow control ring (62) capable of being attached to the peripheral wall of the valve core (2) and having the same number as the flow control groove groups (4), and an annular groove (63) located between adjacent flow control rings (62) and between the valve seat (61) and the adjacent flow control ring (62), a plurality of annular grooves (63) correspond to a plurality of flow control groove groups (4) one by one, and the gap between the flow control ring (62) and the peripheral wall of the valve core (2) changes by linear movement of the valve core (2) relative to the valve cage (6).
2. The high-pressure-differential small-flow regulating valve according to claim 1, characterized in that: The adjacent flow control groove groups (4) are distributed in a staggered manner in the circumferential direction of the valve core (2).
3. A high-pressure-differential small-flow regulating valve according to claim 1 or 2, characterized in that: The end of the valve core (2) not connected with the valve rod (3) is provided with an extension (7) penetrating the valve seat (61) and having a diameter smaller than that of the valve core (2), and the peripheral wall of the extension (7) is provided with two opposite chamfered surfaces (71), the distance between the two chamfered surfaces (71) decreases in the direction away from the valve core (2).