Regulating valve capable of quickly realizing high and low flow switching and control method thereof

Abstract

The invention discloses a regulating valve capable of quickly realizing large and small flow switching and a control method thereof, relates to the technical field of regulating valves, and is obviously different from a conventional regulating valve in improvement of a valve rod structure. The initial purpose is to meet the requirement for medium flow fluctuation in an upstream channel through the moving capacity of the movable valve rod, the control method comprises three stages of self-weight balance, information interaction and opposite regulation and control, opening balance is completed through a balancing weight, then the medium flow and valve element opening information are combined, and the valve element opening degree is adjusted and controlled. Two times of opening degree switching are achieved through the fixed valve rod and the electromagnetic action assembly in sequence, the fluid flow fluctuation scene can be adapted, the pressure fluctuation influence during opening degree switching is reduced, firstly, self-adaption can be conducted according to the medium flow change in an upstream channel, and secondly, active interference can be conducted through the electromagnetic action assembly; the passing requirement of a medium in a downstream channel is ensured, and the negative influence caused by medium pressure is reduced.

Description

Technical Field

[0001] This invention relates to the field of regulating valve technology, specifically to a regulating valve and its control method that can quickly switch between large and small flow rates. Background Technology

[0002] The core function of a control valve is to automatically adjust the valve core opening by receiving signals from the control system, thereby achieving dynamic control of process parameters (fluid flow). Common valve body structures include single / double seat valves, sleeve valves, butterfly valves, ball valves, etc. In order to reduce the impact of high pressure fluctuations in the fluid on the valve body / valve core structure, buffer protection structures are often adopted, as mentioned in the relevant content in publication number CN118654142A.

[0003] A regulating valve is essentially used to regulate fluid flow. However, for fluids with non-constant flow rates, on the one hand, the fluid pressure fluctuates significantly when the opening is changed; on the other hand, normal fluctuations in fluid flow also affect fluid pressure. Therefore, protection structures designed for high-pressure fluids are ill-suited for these situations. Specifically, when the initial fluid flow rate is high, the fluid pressure in the downstream channel tends to rise significantly when switching from a large opening to a small opening, and vice versa. However, when the fluid flow rate is low, the pressure generated by the fluid is relatively low. During the opening change process, the flow rate requirements of the medium in the downstream channel must be considered first, and the pressure fluctuations caused by the change in medium flow rate must also be taken into account. Essentially, it is necessary to avoid the negative impact of the high pressure difference between the upstream and downstream channels while ensuring that the opening meets the flow rate requirements of the medium in the downstream channel. This invention proposes a solution to this problem. Summary of the Invention

[0004] The purpose of this invention is to provide a regulating valve and its control method that can quickly switch between large and small flow rates. In particular, it is aimed at application environments where the fluid flow rate fluctuates significantly. The pressure fluctuation caused by the pressure fluctuation during the opening switch and the pressure caused by the fluid flow fluctuation will aggravate the negative impact on the valve body.

[0005] The objective of this invention can be achieved through the following technical solution: a regulating valve that can quickly switch between large and small flow rates, comprising a valve body, an electric actuator assembly, a fixed valve stem, a valve core, and a valve seat, wherein the valve core and valve seat are arranged in the upward direction corresponding to the upstream and downstream channels inside the valve body; A vertically arranged moving valve stem is installed at the center point of the valve core. The moving valve stem and the fixed valve stem are connected in a sliding manner, and an overflow cavity is formed inside the moving valve stem that passes through the valve core and is connected to the upstream channel. An external fixing sleeve is installed on the valve body along the length of the fixed valve stem. One end of the external fixing sleeve extends into the valve body and is slidably mounted with a downward liquid-dispensing rod. The lower end of the downward liquid-dispensing rod is located directly above the valve core and performs a downward pressing action on the valve core.

[0006] The configuration is further improved by driving the fixed valve stem to slide vertically on the valve body via the electric actuator assembly, and a spring is provided at the connection between the fixed valve stem and the moving valve stem.

[0007] The valve core is further configured such that a counterweight is installed in the valve core, and a linear sensing component is installed on the valve shell at a position directly below the center point of the valve core. The transmission rod of the linear sensing component is slidably connected to the valve shell, and one end of the linear sensing component is fixedly connected to the valve core.

[0008] The following configuration is further provided: the lower liquid-dispensing rod is hollow inside and its upper end is connected to the internal fixed sleeve, and a flexible hose is connected between the lower liquid-dispensing rod and the moving valve rod, and the lower liquid-dispensing rod and the overflow cavity are kept in communication through the flexible hose.

[0009] The configuration is further defined as follows: the external fixing sleeves are arranged in a circular array along the center point of the valve core.

[0010] The configuration is further defined as follows: an electromagnetic actuation component is provided inside the external fixing sleeve. The electromagnetic actuation component consists of a solenoid assembly and a permanent magnet piston block. The solenoid assembly is installed at the top of the inner part of the external fixing sleeve. The permanent magnet piston block is slidably connected inside the external fixing sleeve and is located below the solenoid assembly.

[0011] A control method for a regulating valve that can quickly switch between large and small flow rates includes a self-weight balancing stage, an information interaction stage, and a counter-control stage. In the information interaction stage, the medium flow information in the upstream channel of the valve body and the opening information of the valve core relative to the valve seat are acquired. The self-weight balancing stage, as the preceding part of the counter-control stage, completes the opening balancing action through the counterweight block in the valve core. During the counter-control phase, based on the opening information and medium flow information, and in conjunction with the opening balance action, the valve stem first performs the opening switching action one, and then the valve core completes the opening switching action two through the electromagnetic actuation component.

[0012] The present invention has the following beneficial effects: 1. For application environments where the fluid flow rate fluctuates significantly, the combination of fixed and moving valve stems, the balancing effect of the counterweight, and the active control of the electromagnetic actuation components effectively prevent the pressure fluctuations caused by opening switching from being superimposed on the pressure caused by the fluid flow rate fluctuations. This significantly reduces the impact and negative effects on the valve body structure, solves the problem of poor adaptability of conventional control valves in non-constant flow fluid scenarios, adapts to flow fluctuation scenarios, and mitigates the superimposed effects of pressure fluctuations. 2. By acquiring valve core opening information in real time using linear sensing components and combining it with upstream channel medium flow data, the valve core opening is switched in two stages during the counter-control phase. First, the valve stem is used for initial switching, and then the lower lever is driven by the electromagnetic actuator for fine adjustment. This ensures that the valve core opening matches the downstream channel's medium flow requirements and can dynamically adapt to changes in fluid flow, avoiding flow control failure caused by opening deviation. The rapid drive of the valve stem by the electric actuator and the instantaneous control of the lower lever by the electromagnetic actuator significantly shorten the response time for switching between large and small flow rates. Whether switching from "opening" to large flow or from large flow to small flow, it can quickly adapt to changes in operating conditions, making it particularly suitable for industrial fluid control scenarios with high requirements for flow switching efficiency. 3. The overflow cavity inside the moving valve stem allows the upstream medium to enter the lower valve stem through the hose. Together with the lower valve stem and the external fixed sleeve, they form a "cylinder-like structure" that can balance the pressure difference between the upper and lower sides of the valve core during the opening switching process. At the same time, the spring at the connection between the fixed valve stem and the moving valve stem can buffer the thrust of the medium pressure on the valve core, avoid damage to the valve body caused by the high pressure difference between the upstream and downstream channels, and ensure the long-term stable operation of the regulating valve. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of a regulating valve that can quickly switch between large and small flow rates, as proposed in this invention. Figure 2 for Figure 1 Sectional view of the middle valve body; Figure 3 Corresponding to the present invention Figure 2 A sectional view; Figure 4 for Figure 2 Cross-sectional view of the valve core and valve seat; Figure 5This is a cross-sectional view of the fixed valve stem in this invention; Figure 6 for Figure 5 Cross-sectional views of the stationary valve stem and the moving valve stem.

[0015] In the diagram: 1. Valve housing; 2. External fixing sleeve; 3. Electric actuator assembly; 4. Fixed valve stem; 5. Linear sensing component; 6. Valve seat; 7. Valve core; 8. Moving valve stem; 9. Lowering liquid-dispensing rod; 10. Counterweight; 11. Electromagnetic actuation component. Detailed Implementation

[0016] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Example 1: Specifically addressing the issue of pressure fluctuations caused by significant fluctuations in fluid flow rate, where the combined pressure fluctuations resulting from opening changes and the fluid's own pressure fluctuations exacerbate the negative impact on the valve body, the following technical solutions are proposed: Reference Figures 1-6 The present invention provides a regulating valve that can quickly switch between large and small flow rates, comprising a valve body 1, an electric actuator assembly 3, a fixed valve stem 4, a valve core 7, and a valve seat 6. The valve core 7 and the valve seat 6 are arranged in the upward direction corresponding to the upstream and downstream channels inside the valve body 1. A vertically arranged moving valve stem 8 is installed at the center point of the valve core 7. The moving valve stem 8 and the fixed valve stem 4 are connected in a sliding manner, and an overflow cavity is formed inside the moving valve stem 8 that passes through the valve core 7 and is connected to the interior of the upstream channel. An external fixing sleeve 2 is installed on the valve housing 1 along the length direction parallel to the fixed valve stem 4. One end of the external fixing sleeve 2 extends into the valve housing 1 and is slidably mounted with a downward liquid-dispensing rod 9. The lower end of the downward liquid-dispensing rod 9 is located directly above the valve core 7 and performs a downward pressing action on the valve core 7. The electric actuator assembly 3 drives the fixed valve stem 4 to slide vertically on the valve housing 1. A spring is provided at the connection between the fixed valve stem 4 and the moving valve stem 8.

[0018] Basic Principle: A brief explanation of the function and principle of the regulating valve: It changes the flow rate of the medium by altering the opening degree of the valve core. Taking the butterfly disc in a butterfly valve and the ball core in a ball valve as examples, the structure of the regulating valve in this invention will be explained as follows: Refer to... Figure 4 and Figure 5The key to this explanation lies in the positioning of the valve core 7 and the valve seat 6. They are located precisely at the junction of the upstream and downstream channels, with the valve core 7 positioned relatively above the valve seat 6. This is to ensure that when the medium enters the downstream channel from the upstream channel, it primarily exerts an upward thrust on the valve core 7. Furthermore, the design of the reverse conical surface at the intersection of the valve core 7 and the valve seat 6 is utilized. The position of the valve seat 6 remains unchanged, while the valve core 7 can move upward. As the upward distance of the valve core 7 increases, the opening of the medium through the two channels gradually increases. This part is the basic principle of the regulating valve in this invention. This invention is primarily designed for applications where the medium flow rate fluctuates significantly. A key difference from conventional control valves lies in the change in the valve stem structure. In conventional valves, the valve stem is typically a single structure and fixed to the valve core. However, in this invention, the valve stem structure is formed by a combination of a fixed valve stem 4 and a moving valve stem 8. With the fixed valve stem 4 remaining in its position, the valve core 7 can move up and down in conjunction with the fixed valve stem 4 under the action of the moving valve stem 8. This is to accommodate pressure fluctuations caused by changes in the flow rate of the medium.

[0019] Example 2: A counterweight 10 is installed in the valve core 7. A linear sensing component 5 is installed in the valve shell 1 directly below the center point of the valve core 7. The transmission rod of the linear sensing component 5 is slidably connected to the valve shell 1, and one end of the linear sensing component 5 is fixedly connected to the valve core 7. The lower liquid-dispensing rod 9 is hollow inside and its upper end is connected to the internal part of the external fixing sleeve 2. A hose is connected between the lower liquid-dispensing rod 9 and the moving valve rod 8. The lower liquid-dispensing rod 9 is connected to the overflow cavity through the hose. The external fixing sleeve 2 is arranged in a ring array along the center point of the valve core 7. An electromagnetic actuation component 11 is installed inside the external fixing sleeve 2. The electromagnetic actuation component 11 consists of a solenoid assembly and a permanent magnet piston block. The solenoid assembly is installed at the top of the internal part of the external fixing sleeve 2. The permanent magnet piston block is slidably connected inside the external fixing sleeve 2 and is located below the solenoid assembly.

[0020] Solution Description: Based on the technical content in Implementation Example 1, the following actions are described during operation: S1: Reference Figure 3 Explanation: In the initial state, the fixed valve stem 4 moves downward under the action of the electric actuator assembly 3 to ensure that the valve core 7 is completely locked on the valve seat 6. For this purpose, it is necessary to ensure that the spring between the fixed valve stem 4 and the moving valve stem 8 is compressed to the maximum extent. So even if the flow rate of the medium in the upstream channel increases, it will not affect the locked state between the valve core 7 and the valve seat 6. S2: However, during the switching of the opening, the fixed valve stem 4 moves upward, which reduces the compression of the spring between the fixed valve stem 4 and the moving valve stem 8. Therefore, the opening between the valve core 7 and the valve seat 6 is coupled with the upward movement distance of the fixed valve stem 4 and the flow rate of the medium in the upstream channel. Specifically, if the valve stem 4 moves upward a large distance, it may even cause the spring to switch from a compressed state to a stretched state, which can also drive the valve core 7 to move upward, thereby increasing the opening. After the medium in the upstream channel enters the downstream channel, it may continue to exert an upward thrust on the valve core 7, which can reduce the stretch of the spring or restore it to a compressed state, which will also increase the opening. If the valve stem 4 continues to move upward, but the spring is still in a compressed state, the upward thrust on the valve core 7 caused by the medium flow will further increase the compression of the spring, thus forming an opening greater than 0 between the valve core 7 and the valve seat 6. In summary, it can be understood that the opening of valve core 7 relative to valve seat 6 is affected by the medium flow rate and the same direction of the fixed valve stem 4. Its key purpose is to adapt to the changes in medium flow rate in the upstream channel and the pressure difference between the upper and lower sides of valve core 7 when the opening is switched. S3: This section contains the key content of the present invention, specifically further optimizing the valve core 7 opening switching process described in S2. For details, please refer to... Figure 3 and Figure 6 To clarify, even with an opening of 0, the medium in the upstream channel can enter the lower dispensing rod 9 through the valve core 7, the moving valve stem 8, and the hose. Figure 6 As shown, the external fixed sleeve 2 and the lower lever 9 form a structure similar to a hydraulic cylinder. The medium in the upstream channel is the hydraulic oil in the hydraulic cylinder structure. When the opening is 0 and the pressure of the medium in the upstream channel is large, the lower lever 9 moves down under the influence of the medium pressure until it fully contacts the upper surface of the valve core 7. This part represents the initial state of the regulating valve. This can be understood as follows: if the opening distance between the valve core 7 and the valve seat 6 is changed according to the technical content in S2, it will inevitably drive the lower push rod 9 to move upward, causing some of the medium in the lower push rod 9 to enter the upstream channel in the opposite direction of the hose-moving valve rod 8-valve core 7. The purpose is also to cooperate with the pressure difference generated by the change in flow rate and the switching of opening of the medium. S4: In addition to the technical content in S3, the above content is based on the active movement process of the fixed valve rod 4, and the electromagnetic action component 11 does not perform any interference action. However, during specific operation, the electromagnetic group can be energized and magnetized, and a repulsive force is generated with the permanent magnet piston block, causing the permanent magnet piston block to move downward and causing part of the medium in the lower liquid-dispensing rod 9 to enter the upstream channel in the opposite direction of the hose-moving valve rod 8-valve core 7. However, it should be noted that if it is difficult to reverse the medium to the upstream channel, or only part of the medium reverses to the upstream channel, then due to the reduction in the relative volume between the external fixed sleeve 2 and the lower liquid-dispensing rod 9, the lower liquid-dispensing rod 9 will have a downward tendency, thereby pushing the valve core 7 downward to further change the opening degree. This is supplemented by combining the coupling relationship between the opening degree in S2 and the upward movement distance of the fixed valve stem 4 and the upstream channel, and an active interference effect formed by the electromagnetic actuation component 11 is also added.

[0021] Example 3: The control method of the regulating valve is explained in conjunction with Examples 1 and 2: A control method for a regulating valve that can quickly switch between large and small flow rates includes a self-weight balancing stage, an information interaction stage, and a counter-control stage. In the information interaction stage, the medium flow information in the upstream channel of the valve body 1 and the opening information of the valve core 7 relative to the valve seat 6 are obtained. The self-weight balancing stage, as the pre-stage of the counter-control stage, completes the opening balancing action through the counterweight 10 in the valve core 7. During the counter-control phase, based on the opening information and medium flow information, and in conjunction with the opening balance action, the valve stem 4 first performs the opening switching action one, and then the valve core 7 completes the opening switching action two through the electromagnetic actuation component 11.

[0022] Solution Description: Without considering the maintenance of medium flow inside the valve body 1, when the fixed valve stem 4 continues to move upward, the opening between the valve core 7 and the valve seat 6 is significantly related to the elastic potential energy of the spring and the sum of the weight of the counterweight 10 + valve core 7 + moving valve stem 8. For example, when the fixed valve stem 4 moves upward to the point where the valve core 7 just separates from the valve seat 6 and the opening is >0, the elastic potential energy of the spring maintains the relative balance of the valve core 7. This corresponds to the self-weight balance stage. However, in reality, the balance of the spring component is disrupted by the medium, affecting the opening degree. This invention mainly focuses on the information interaction stage and the counter-control stage: First, a flow meter or similar structure is used to obtain the flow rate of the medium entering the upstream channel, and the linear sensing component 5 is used to obtain the movement distance of the valve core 7. The linear sensing component 5 is essentially a displacement sensor, and its displayed value is 0 when the opening degree between the valve core 7 and the valve seat 6 is 0. Therefore, during the opening degree switching process, the displayed value of the linear sensing component 5 is obtained in real time to provide feedback on the opening degree change. Secondly, based on application requirements, the opening degree of valve core 7 and valve seat 6 is changed according to the medium flow requirements (flow rate) in the downstream channel. In the counter-control stage, the opening degree is actively changed based on the opening switching action performed by the fixed valve stem 4. However, the opening switching process is affected by the medium flow rate in the upstream channel. Therefore, the opening degree of valve core 7 can be further changed by the vertical movement of the lower liquid rod 9. The ultimate goal is to ensure the medium flow requirements in the downstream channel and avoid the negative impact caused by the large fluid pressure in the upstream channel.

[0023] In summary, during practical applications, the synergistic action of the electromagnetic actuation component and the downward-pulling rod allows for precise control of the medium's flow state, resulting in smoother flow switching. Furthermore, the real-time data feedback provided by the linear sensing component offers a reliable basis for accurately adjusting the valve core opening. Facing different operating conditions, this regulating valve can respond quickly and make corresponding adjustments, ensuring the stable operation of the entire system. Especially when handling media with large flow rates or significant flow fluctuations, it can significantly reduce the impact of pressure fluctuations on the system and extend the equipment's service life.

[0024] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

[0025] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., 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 the invention. In this specification, 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.

[0026] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A regulating valve capable of fast size flow switching, comprising a valve housing, an electric actuating assembly, a valve stem, a valve core and a valve seat, characterized in that, The valve core and valve seat corresponding to the upstream passage and downstream passage inside the valve shell are arranged in the uplink direction; The center point of the valve core is provided with a vertically arranged movable valve rod, which is in sliding connection with the fixed valve rod, and an overflow cavity is formed inside the movable valve rod and communicates with the upstream passage; An external fixing sleeve is arranged on the valve shell along the length direction of the fixed valve rod, one end of the external fixing sleeve extends into the valve shell and is provided with a lower liquid pushing rod which is in sliding connection, and the lower end of the lower liquid pushing rod is located directly above the valve core and performs a downward pressing action on the valve core.

2. The regulating valve capable of quickly switching flow rate according to claim 1, characterized in that, The fixed valve rod is in sliding connection with the valve shell in the vertical direction by the electric actuator assembly, and a spring is arranged at the connection between the fixed valve rod and the movable valve rod.

3. The regulating valve capable of quickly switching flow rate according to claim 2, characterized in that, A counterweight is arranged in the valve core, a linear sensor assembly is arranged below the center point of the valve core in the valve shell, the transmission rod of the linear sensor assembly is in sliding connection with the valve shell, and one end of the linear sensor assembly is in fixed connection with the valve core.

4. The regulating valve capable of quickly switching flow rate according to claim 3, characterized in that, The lower liquid pushing rod is hollow and communicates with the internal fixing sleeve, and a hose is arranged between the lower liquid pushing rod and the movable valve rod, and the lower liquid pushing rod and the overflow cavity are in communication through the hose.

5. The regulating valve capable of quickly switching flow rate according to claim 4, characterized in that, The external fixing sleeve is arranged in a ring array at the center point of the valve core.

6. The regulating valve capable of quickly switching flow rate according to claim 5, characterized in that, An electromagnetic action assembly is arranged in the external fixing sleeve, which is composed of a power-on electromagnetic group and a permanent magnet piston block, the power-on electromagnetic group is arranged at the top end of the external fixing sleeve, the permanent magnet piston block is in sliding connection inside the external fixing sleeve, and the permanent magnet piston block is located below the power-on electromagnetic group.

7. A control method of a regulating valve capable of quickly switching between small and large flow rates, using the regulating valve capable of quickly switching between small and large flow rates according to claim 6, characterized by, The method includes a self-weight balancing stage, an information interaction stage and a counter-regulation stage, in the information interaction stage, the medium flow information in the upstream passage of the valve shell and the opening information of the valve core relative to the valve seat are obtained; The self-weight balancing stage is a pre-stage in the counter-regulation stage, and the opening balancing action is completed by the counterweight in the valve core; In the counter-regulation stage, the opening switching action one of the fixed valve rod is performed first according to the opening information and the medium flow information, and the opening switching action two of the valve core is completed by the electromagnetic action assembly.

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