A flow regulation device for thermal control pipelines in power plants

Abstract

This invention discloses a flow regulation device for thermal control pipelines in power plants, relating to the field of thermal control pipeline technology. It includes a limiting unit comprising a base, a rotating sleeve disposed on the end face of the base, a first screw threadedly engaged with the rotating sleeve, a push plate disposed on the inner wall of the rotating sleeve, a sliding member abutting against the push plate, and a lifting sleeve sleeved inside the first screw. A groove is provided inside the base, and the sliding member moves along the inner wall of the groove. The push plate rotates synchronously with the rotating sleeve, pressing the sliding member to clamp the valve stem close to the base axis. The rotating sleeve rotates and presses the sliding member, and the cooperation between multiple sets of sliding members completes the clamping and fixing of the valve stem. While the sliding member clamps the valve stem, it also pushes a support rod to move, limiting the position of the reciprocating component through the support rod, thereby ensuring the cooperation between the reciprocating component and the handwheel and limiting the rotation angle of the handwheel.

Description

Technical Field

[0001] This invention relates to the field of thermal control pipeline technology, and in particular to a flow regulation device for thermal control pipelines in power plants. Background Technology

[0002] In the thermal control piping system of a power plant, the stability and accuracy of the flow regulation device are core technical indicators for ensuring the safe and economical operation of the unit. Stability is reflected in the device's ability to resist interference under complex operating conditions (such as pressure transients, temperature surges, and high-frequency vibrations) and its long-term mechanical reliability, while accuracy directly determines the response speed, regulation error range, and closed-loop feedback effectiveness of the flow control.

[0003] In the field of industrial pipeline flow control, traditional flow regulating devices generally rely on manually turning the handwheel to drive the valve core displacement to adjust the opening. Such traditional flow regulating devices have significant defects in practical applications: after the opening is adjusted, the valve core position is maintained mainly by the friction between the handwheel and the valve stem or by a simple mechanical limiting structure, which has weak anti-accidental contact capability. In actual operation, when the operator is performing other tasks, the operator may accidentally touch the handwheel, causing the valve opening to change and affecting the normal operation of the equipment. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is: how to prevent workers from accidentally touching the handwheel, which would cause the valve opening to change.

[0005] The above-mentioned technical problems are solved by the following technical solution: The present invention proposes a flow regulation device for thermal control pipelines in power plants, a limiting unit, including a base, a rotating sleeve provided on the end face of the base, a first screw threadedly engaged with the rotating sleeve on the inner side of the rotating sleeve, a push plate that rotates synchronously with the rotating sleeve on the inner wall of the rotating sleeve, a sliding member that abuts against the push plate on the inner side of the push plate, and a lifting sleeve nested inside the first screw.

[0006] A valve stem is inserted inside the base;

[0007] The base has a sliding groove inside and a conical groove located in the center of the base. The sliding member moves along the trajectory of the inner wall of the sliding groove.

[0008] The rotating sleeve rotates, causing the push plate to press against the sliding member, and the sliding member moves to the inner wall of the conical groove and abuts against the outer wall of the valve stem;

[0009] The rotating sleeve can drive the push plate to press the sliding parts to move closer to the center of the base. The multiple sets of sliding parts cooperate to fit tightly against the outer wall of the valve stem, which can complete the clamping and fixing of the valve stem.

[0010] In a preferred embodiment of the power plant thermal control pipeline flow regulation device of the present invention: the number of the chutes is multiple sets, and the multiple sets of chutes are distributed in a circumferential array along the axis of the conical groove;

[0011] The number of push plates is adapted to the number of slides;

[0012] The projection of the inner wall of the push plate along the axial direction of the base is a curved arc. The first end of the projection of the push plate is close to the inner wall of the base, and the second end of the projection of the push plate is away from the inner wall of the base.

[0013] The slider moves along a specific trajectory. The surface of the push plate that contacts the slider is an inclined surface. The slider is pushed to move by the push plate as the push plate rotates.

[0014] In a preferred embodiment of the power plant thermal control pipeline flow regulation device of the present invention:

[0015] The outer wall of the sliding component abuts against the inner wall of the tapered groove;

[0016] The sliding element moves in the same direction as the valve stem due to friction.

[0017] The sliding component uses ball bearings. When the outer wall of the ball bearings touches the outer wall of the valve stem, the ball bearings are located inside the conical groove. Due to friction, the ball bearings move in the same direction as the valve stem. When the valve stem tends to move downwards, the ball bearings will also move downwards along the inner wall of the conical groove. However, the smaller diameter of the conical groove causes the ball bearings to get closer to the valve stem, thus clamping the valve stem more securely.

[0018] In a preferred embodiment of the power plant thermal control pipeline flow regulation device of the present invention: the positioning unit includes a support rod disposed at the end of the lifting sleeve away from the rotating sleeve, a connecting rod disposed inside the support rod, a second screw connected to the connecting rod, a support frame disposed on the outer circumference of the support rod, and a handwheel disposed on the inner top of the support frame;

[0019] The handwheel is threadedly engaged with the second screw, and the handwheel is connected to the support frame via a bearing;

[0020] The rotation of the handwheel causes the second screw to move vertically.

[0021] The handwheel and the second screw are threaded together. By rotating the handwheel, the second screw is moved vertically, and the movement of the second screw indirectly affects the opening degree of the valve.

[0022] In a preferred embodiment of the power plant thermal control pipeline flow regulation device of the present invention:

[0023] The positioning unit also includes an elastic element sleeved inside the connecting rod, and a reciprocating element disposed inside the support frame;

[0024] The elastic element is used to lift the valve stem, and the elastic element pushes the valve stem so that the top of the valve stem keeps in contact with the top of the inner wall of the connecting rod;

[0025] The elastic element releases its elastic potential energy, pushing the valve stem to press tightly against the top of the inner wall of the connecting rod, ensuring that the valve stem drives the valve core to move, thus keeping the valve open.

[0026] In a preferred embodiment of the power plant thermal control pipeline flow regulation device of the present invention: the bottom of the handwheel can abut against the reciprocating component, and the bottom of the handwheel is provided with multiple sets of positioning grooves that cooperate with the reciprocating component;

[0027] The lifting sleeve abuts against the support rod;

[0028] The sliding member pushes the lifting sleeve to move, thereby causing the support rod to abut against the reciprocating member;

[0029] The handwheel rotates, which in turn squeezes the reciprocating part multiple times. When the positioning groove corresponds to the position of the reciprocating part, the top of the reciprocating part is inserted into the positioning groove. When the end face of the handwheel contacts the reciprocating part, the reciprocating part is compressed. As the handwheel rotates, the end of the reciprocating part engages with the positioning groove and makes a sound to help the operator understand the angle of the handwheel rotation.

[0030] In a preferred embodiment of the power plant thermal control pipeline flow regulation device of the present invention: the valve body is internally divided into two flow channels, which are connected by a through hole;

[0031] A valve seat is installed inside a through hole, and a sealing gasket is provided at the contact position between the valve seat and the through hole.

[0032] The valve core cooperates with the valve seat and can block the internal passage of the valve seat.

[0033] In a preferred embodiment of the power plant thermal control pipeline flow regulation device of the present invention: the valve core is connected to the valve stem at its end, and the valve core moves with the valve stem in the vertical direction, thereby controlling the flow rate of the pipeline fluid;

[0034] The valve stem passes through the valve body and extends to the outside of the valve body;

[0035] The valve core moves synchronously with the valve stem, making it easy to control the opening and closing state of the valve.

[0036] In a preferred embodiment of the power plant thermal control pipeline flow regulation device of the present invention: a valve cap is provided at the top of the valve body;

[0037] A mounting bracket is installed on the top of the valve cap;

[0038] The base is mounted on the top of the valve cap via the fixing bracket;

[0039] The valve cap protects the top of the valve body to prevent fluid leakage, while also providing a suitable mounting position for the base.

[0040] In a preferred embodiment of the power plant thermal control pipeline flow regulation device of the present invention: the first screw is fixedly connected to the fixed frame;

[0041] The support frame and the fixing frame are fixedly connected;

[0042] The first screw and the support frame are both in a relatively stationary state relative to the valve body, which facilitates the installation of other components above the valve body.

[0043] The beneficial effects of this invention are as follows: by rotating and squeezing the sliding member through the set rotating sleeve, the sliding member can be moved, and the valve stem can be clamped and fixed through the movement and cooperation between multiple sets of sliding members; while the sliding member keeps clamping the valve stem, the sliding member will push the support rod to move, and the position of the reciprocating member will be limited by the support rod, thereby ensuring the cooperation between the reciprocating member and the handwheel and limiting the rotation angle of the handwheel. Attached Figure Description

[0044] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments of the present invention will be briefly described below. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention.

[0045] Figure 1 A three-dimensional structural schematic diagram of a flow regulation device for thermal control pipelines in a power plant is shown.

[0046] Figure 2 A top view of a flow regulation device for thermal control pipelines in a power plant is shown;

[0047] Figure 3 It shows Figure 2 Sectional view at point AA;

[0048] Figure 4 A top view of the positioning unit structure is shown;

[0049] Figure 5 It shows Figure 4 Sectional view at point BB in the middle;

[0050] Figure 6 It shows Figure 5 Enlarged view of section C in the image;

[0051] Figure 7 A schematic diagram of the connection structure between the support frame and the handwheel is shown;

[0052] Figure 8 An exploded view of the positioning unit is shown.

[0053] Figure 9 A schematic diagram of the limiting unit is shown;

[0054] Figure 10 An exploded view of the limiting unit is shown.

[0055] Figure 11 A schematic diagram of the structure with the sliding member clamping the valve stem is shown.

[0056] In the diagram: 1. Limiting unit; 11. Base; 111. Slide groove; 112. Conical groove; 12. Rotating sleeve; 13. First screw; 14. Push plate; 15. Sliding component; 16. Lifting sleeve; 2. Positioning unit; 21. Support rod; 22. Connecting rod; 23. Second screw; 24. Elastic component; 25. Support frame; 26. Handwheel; 261. Positioning groove; 27. Reciprocating component; 31. Valve body; 32. Valve seat; 33. Valve core; 34. Valve stem; 35. Valve cap; 36. Fixing frame. Detailed Implementation

[0057] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0058] The terminology used in this invention is that which is currently widely used in the art in consideration of the function of the invention; however, these terms may vary according to the intent of those skilled in the art, precedent, or new technology in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the invention. Therefore, the terms used in this specification should not be construed as simple names, but rather based on their meanings and the overall description of the invention.

[0059] Reference Figure 3 , Figures 9-11This embodiment provides a flow regulation device for thermal control pipelines in a power plant, including a limiting unit 1. The limiting unit 1 can clamp and fix the valve stem 34. After the valve opening is adjusted, it can effectively prevent the valve stem 34 from being accidentally touched, causing the valve core 33 to move and resulting in a change in the fluid flow rate. The limiting unit 1 includes a base 11, which is connected to the valve body through a mounting bracket to ensure that the position between the base 11 and the valve body is relatively fixed. A rotating sleeve 12 is disposed on the end face of the base 11. When the base 11 is arranged in the vertical direction, the end face of the rotating sleeve 12 is fixed. The surface is the upper surface of the base 11; the first screw 13 is threadedly engaged with the rotating sleeve 12, and the first screw 13 is in a relatively fixed position with the valve body. The first screw 13 is connected to the valve body through a connecting bracket; the push plate 14 is disposed on the inner wall of the rotating sleeve 12, and the push plate 14 and the rotating sleeve 12 are fixed by bolt connection. The rotation of the rotating sleeve 12 can drive the push plate 14 to rotate synchronously; the sliding member 15 is disposed inside the base 11, and the sliding member 15 abuts against the push plate 14; the first screw 13 is a rod-shaped structure with both ends through, and the lifting sleeve 16 is nested inside the first screw 13.

[0060] Furthermore, a groove 111 is provided inside the base 11, and the sliding member 15 moves along the inner wall of the groove 111. The groove 111 restricts the movement trajectory of the sliding member 15, thereby ensuring that when the push plate 14 rotates and squeezes the sliding member 15, the sliding member 15 moves along the inner wall of the groove 111, and moves closer to the center of the base 11 to clamp and fix the valve stem 34. The push plate 14 rotates synchronously with the rotating sleeve 12, and the push plate 14 can squeeze the sliding member 15. After being compressed, the sliding member 15 moves closer to the axis of the base 11 and clamps the valve stem 34.

[0061] It should be noted that the sliding member 15 moves towards the axis of the base 11, and at the same time, the sliding member 15 abuts against the bottom of the lifting sleeve 16. When the sliding member 15 is not squeezed by the push plate 14, the sliding member 15 can move freely along the slide groove 111. In this state, the sliding member 15 cannot push the lifting sleeve 16 to move. However, when the sliding member 15 is squeezed by the push plate 14, the sliding member 15 moves towards the center position of the base 11, so that it can have enough force to lift the lifting sleeve 16.

[0062] The outer contour of the base 11 along its own axis is circular. A circular hole is provided in the center of the base 11. The diameter of the circular hole meets the movement requirements of the valve stem 34, so that the valve stem 34 can pass through the base 11 and extend to the outside of the base 11. An annular protrusion is provided at the end of the base 11 near the rotating sleeve 12. An annular groove is provided at the position opposite to the annular protrusion on the surface of the rotating sleeve 12 and the base 11. The rotation sleeve 12 and the base 11 are kept coaxial by the cooperation between the annular groove and the annular protrusion.

[0063] The rotating sleeve 12 has an internal thread structure, and the internal thread of the rotating sleeve 12 is adapted to the external thread of the first screw 13; and the end of the first screw 13 away from the rotating sleeve 12 is provided with an extension, which can meet the connection between the first screw 13 and the mounting bracket, thereby ensuring that the first screw 13 and the base 11 are always in a relatively static state.

[0064] In this embodiment, the slider 15 can be a slider structure with a trapezoidal cross-section. The end of the slider 15 away from the valve stem 34 abuts against the push plate 14. The push plate 14 rotates synchronously with the rotating sleeve 12. The inclined surface of the push plate 14 presses against the slider 15, causing the slider 15 to move closer to the valve stem 34 after being pressed. The valve stem 34 is clamped and fixed by the slider 15 abutting against the outer wall of the valve stem 34.

[0065] As the slider 15 of the trapezoidal slider structure approaches the valve stem 34, the inclined surface at the end of the trapezoidal slider will gradually abut against the bottom of the lifting sleeve 16 and push the lifting sleeve 16 to move away from the base 11, thereby causing the end of the lifting sleeve 16 to protrude from the surface of the first screw 13.

[0066] In the daily operation of a power plant, in order to ensure that the fluid output meets the production requirements, the valve opening needs to be controlled at a certain size. In order to prevent the valve opening from changing due to accidental touch of the valve switch by the staff while performing other operations, the position of the valve core 33 needs to be fixed. When fixing the position of the valve core 33, the rotating sleeve 12 can be rotated. The rotating sleeve 12 moves in a circle along the axis of the first screw 13. The rotation of the rotating sleeve 12 drives the inclined surface of the push plate 14 to press the sliding member 15, pushing the sliding member 15 to move closer to the valve stem 34. As the end of the sliding member 15 abuts against the outer wall of the valve stem 34, the valve stem 34 is clamped and fixed.

[0067] Reference Figures 9-11 As an optional embodiment, the base 11 includes a conical groove 112 disposed in the center; the number of sliding grooves 111 is multiple sets, and the multiple sets of sliding grooves 111 are distributed in a circumferential array along the axis of the conical groove 112; the number of push plates 14 is adapted to the number of sliding grooves 111.

[0068] The conical groove 112 gradually decreases in diameter from top to bottom along the vertical direction; the number of grooves 111 is at least three sets.

[0069] Furthermore, the projection of the inner wall of the push plate 14 along the axial direction of the base 11 is a curved arc. The first end of the projection of the push plate 14 is close to the inner wall of the base 11, and the second end of the projection of the push plate 14 is far away from the inner wall of the base 11. The push plate 14 is connected to the rotating sleeve 12 by bolts. The number of push plates 14 corresponds to the number of slide grooves 111. Multiple sets of push plates 14 are distributed in a circumferential array along the axial direction of the inner wall of the rotating sleeve 12.

[0070] It should be noted that the first and second ends of the push plate 14 are curved arc structures, and the inner wall of the first end is closer to the outer wall of the base 11, while the inner wall of the second end is farther from the outer wall of the base 11.

[0071] Furthermore, in this embodiment, the sliding member 15 can be a ball bearing. When the sliding member 15 is close to the axis of the base 11 and abuts against the outer wall of the valve stem 34, the sliding member 15 is inside the tapered groove 112, and the sliding member 15 moves in the same direction as the valve stem 34 through friction.

[0072] The push plate 14 rotates synchronously with the rotating sleeve 12. The push plate 14 rotates and squeezes the sliding member 15 to move along the inner wall of the slide groove 111. When the outer wall of the sliding member 15 abuts against the outer wall of the valve stem 34, the multiple sets of sliding members 15 cooperate to clamp the valve stem 34. When the valve stem 34 is in the clamped state, the sliding member 15 has moved to the inner side of the conical groove 112, and the outer wall of the sliding member 15 abuts against the inner wall of the conical groove 112. At this time, if the valve stem 34 has a tendency to move downward, due to the influence of friction, the movement of the valve stem 34 will drive the sliding member 15 to move downward synchronously. However, because the downward opening diameter of the conical groove 112 becomes smaller, the sliding member 15 cannot move downward. That is, the multiple sets of sliding members 15 restrict the downward movement trajectory of the valve stem 34. The cooperation between the multiple sets of sliding members 15 can completely restrict the downward movement tendency of the valve stem 34, thereby effectively preventing the operator from accidentally touching the valve stem 34 and causing the valve core 33 to move downward and change the valve opening.

[0073] Reference Figures 4-8 In one embodiment of the present invention, a positioning unit 2 is included. The positioning unit 2 controls the movement of the valve core 33 to adjust the valve opening. The positioning unit 2 includes a support rod 21 disposed at the end of the lifting sleeve 16 away from the rotating sleeve 12. When the lifting sleeve 16 moves upward along the axis of the base 11, the support rod 21 moves upward synchronously with the lifting sleeve 16. When the lifting sleeve 16 moves downward, the support rod 21 also moves downward synchronously under its own gravity. A connecting rod 22 is disposed inside the support rod 21. A second screw 2... 3. Connected to the connecting rod 22, the second screw 23 has an L-shaped protrusion at its end near the connecting rod 22. The connecting rod 22 and the second screw 23 also have a protrusion structure that cooperates with the L-shaped protrusion at their contact points, and the protrusion structures of the connecting rod 22 and the second screw 23 are interlocked. Through the cooperation between the protrusions at the ends of the second screw 23 and the connecting rod 22, the end of the second screw 23 and the connecting rod 22 are engaged, thereby ensuring that when the second screw 23 moves in the vertical direction, it can drive the connecting rod 22 to move.

[0074] Furthermore, the support frame 25 is disposed on the outer circumference of the support rod 21, and the support frame 25 and the support rod 21 are coaxially disposed, and the position of the support frame 25 and the valve body is relatively stationary; the end of the handwheel 26 is disposed on the inner side of the top of the support frame 25, and the handwheel 26 and the support frame 25 are coaxially disposed.

[0075] The handwheel 26 and the second screw 23 are threaded together. The handwheel 26 has an internal thread structure, and the internal thread of the handwheel 26 meshes with the external thread of the second screw 23. The handwheel 26 is connected to the support frame 25 through a bearing. The outer diameter of the handwheel 26 is matched with the inner diameter of the bearing, and the outer diameter of the bearing is matched with the installation position size inside the support frame 25. Since the position of the handwheel 26 is fixed by the support frame 25, rotating the handwheel 26 can drive the second screw 23 to move in the vertical direction, which makes it easier for the operator to operate.

[0076] To further ensure that the second screw 23 does not rotate circumferentially with the handwheel 26, one or more vertical keyways are opened on the axial sidewall of the second screw 23, and a guide key is provided inside the support frame 25 to cooperate with the keyway of the second screw 23. The keyway and the guide key cooperate to restrict the circumferential rotation of the second screw 23, thereby ensuring that the rotation of the handwheel 26 can drive the second screw 23 to move in the vertical direction.

[0077] It should be noted that the resistance at the thread engagement between the second screw 23 and the handwheel 26 is small, and the second screw 23 can be easily moved to change its vertical position when the handwheel 26 is rotated.

[0078] Furthermore, the positioning unit 2 also includes an elastic element 24 sleeved inside the connecting rod 22, and a reciprocating element 27 disposed inside the support frame 25; the elastic element 24 is used to lift the valve stem 34, the elastic element 24 releases elastic potential energy and pushes the valve stem 34, so that the top of the valve stem 34 keeps in contact with the top of the inner wall of the connecting rod 22.

[0079] During the vertical movement of the second screw 23, in order to ensure that the valve stem 34 can make a corresponding response, an elastic element 24 is provided inside the support rod 21; one end of the elastic element 24 abuts against the bottom of the support rod 21, and the end of the elastic element 24 away from the bottom of the support rod 21 abuts against the end of the valve stem 34 away from the valve core 33; through the elastic potential energy released by the elastic element 24, the top of the valve stem 34 is effectively ensured to abut against the top of the inner wall of the connecting rod 22.

[0080] In this embodiment, the elastic element 24 is preferably a spring, but it can also be other structures with elastic deformation capabilities such as a rubber sleeve; the outer wall of the connecting rod 22 abuts against the inner wall of the support rod 21, and a certain movable cavity is formed between the connecting rod 22 and the valve stem 34, and the elastic element 24 is disposed inside the movable cavity; during the extrusion process, the outer wall of the elastic element 24 always abuts against the inner wall of the connecting rod 22, thereby effectively preventing the elastic element 24 from exceeding its own elastic deformation range.

[0081] It should be noted that when the second screw 23 drives the connecting rod 22 to move upward a certain distance, a certain gap will be generated between the connecting rod 22 and the end of the valve stem 34 away from the valve core 33. The elastic force of the elastic element 24 can push the valve stem 34 to move closer to the connecting rod 22. When the second screw 23 pushes the connecting rod 22 downward, the connecting rod 22 abuts against the top of the valve stem 34, and the connecting rod 22 moves downward, which in turn can drive the valve stem 34 to move downward.

[0082] In this embodiment, the position of the second screw 23 in the vertical direction is adjusted by rotating the handwheel 26, thereby driving the valve stem 34 to move, thereby changing the position of the valve core 33, and ultimately controlling the opening and closing state of the valve.

[0083] Reference Figures 4-6 In some embodiments, the bottom of the handwheel 26 can abut against the reciprocating member 27, and the end of the handwheel 26 is provided with multiple sets of positioning grooves 261 that cooperate with the reciprocating member 27; the lifting sleeve 16 abuts against the support rod 21; the sliding member 15 pushes the lifting sleeve 16 to move, thereby causing the support rod 21 to abut against the reciprocating member 27.

[0084] It should be noted that the end face of the handwheel 26 near the support frame 25 is flush with the bottom surface of the mounting groove inside the support frame 25. The surface of the handwheel 26 that abuts against the support frame 25 is provided with a positioning groove 261. There are multiple sets of positioning grooves 261, and the multiple sets of positioning grooves 261 are distributed in a circular array along the axial direction of the handwheel 26.

[0085] The support frame 25 has an internal cavity, and the reciprocating component 27 is disposed inside the cavity. The reciprocating component 27 consists of a rod, a spring, and a cylindrical protrusion. When the handwheel 26 is rotated and the handwheel 26 approaches the end face of the support frame 25 to press the cylindrical protrusion, the reciprocating component 27 moves away from the handwheel 26 after being pressed. As the cylindrical protrusion moves downward, it compresses the spring. As the cylindrical protrusion moves, the bottom surface of the rod penetrates the inner wall of the support frame 25 and extends to the outer side of the support frame 25.

[0086] It should be noted that the reciprocating component 27 is located inside the support frame 25, and can only perform reciprocating linear motion within a fixed position inside the support frame 25. As the handwheel 26 rotates, the positioning groove 261 and the end face of the handwheel 26 near the support frame 25 alternately press the reciprocating component 27, causing the reciprocating component 27 to move in a reciprocating motion state. When the handwheel 26 rotates, it rotates from the position of the first positioning groove 261 to the position of the second positioning groove 261. During the rotation, the reciprocating component 27 moves from being pressed... After returning to its original state, the cylindrical protrusion on the top of the reciprocating part 27 extends to the inner side of the second positioning groove 261. During the process of the spring pushing the cylindrical protrusion to reset, the cylindrical protrusion contacts the handwheel 26 and makes a sound. At the same time, after the reciprocating part 27 cooperates with the positioning groove 261, the rotation of the handwheel 26 will also be subject to corresponding resistance. Through the cooperation between the reciprocating part 27 and the positioning groove 261, it is easier for the operator to control the rotation angle of the handwheel 26, so as to ensure that the rotation angle of the handwheel 26 is within the controllable range.

[0087] In use, the operator rotates handwheel 26. During rotation, the end face of handwheel 26 near support frame 25 presses the reciprocating component 27 downward. When the positioning groove 261 corresponds to the position of the reciprocating component 27, the spring of the reciprocating component 27 pushes the top cylindrical protrusion of the spring into the inner side of the positioning groove 261. The reciprocating component 27 makes a sound when it contacts handwheel 26, reminding the operator that handwheel 26 has completed a small angle adjustment. The operator can also feel the angle change by applying different rotational forces to handwheel 26. When the reciprocating component 27 is engaged with positioning groove 261, the force required to rotate handwheel 26 is slightly greater than the rotational force required when the pressing surface of handwheel 26 contacts the top of reciprocating component 27. Therefore, the operator can judge whether the rotation angle of handwheel 26 is accurate by feeling the different external forces required to rotate handwheel 26 at different angles.

[0088] It should be noted that the included angle between two adjacent sets of positioning grooves 261 is N. That is, after the handwheel 26 rotates by an included angle of N degrees, the position of the reciprocating part 27 will coincide with the positioning groove 261. Then, under the push of the spring of the reciprocating part 27, the top of the reciprocating part 27 will be inserted into the positioning groove 261. Through precise control, the rising height of the second screw 23 can be precisely adjusted, which makes it easier for the staff to better control the opening of the valve.

[0089] After ensuring that the handwheel 26 rotates to the appropriate opening, the sliding member 15 can be squeezed by rotating the rotating sleeve 12. After being squeezed, the sliding member 15 moves towards the valve stem 34. When the outer wall of the sliding member 15 abuts against the outer wall of the valve stem 34, the cooperation between multiple sets of sliding members 15 can effectively clamp the valve stem 34. At the same time, the sliding member 15 also pushes the lifting sleeve 16 to move upward. The movement of the lifting sleeve 16 lifts the support rod 21, so that the top of the support rod 21 contacts the top surface of the inner wall of the support frame 25. Thus, the movement trajectory of the reciprocating member 27 is further restricted by the support rod 21, ensuring that the cylindrical protrusion at the top of the reciprocating member 27 is inserted into the positioning groove 261. The position between the handwheel 26 and the support frame 25 is fixed by the reciprocating member 27. At this time, the handwheel 26 cannot rotate due to the limitation of the reciprocating member 27, thus effectively preventing the operator from accidentally touching the handwheel 26 and causing a change in the valve opening.

[0090] It should be noted that the end of the lifting sleeve 16 that contacts the sliding member 15 is chamfered at a convenient position. The chamfered surface ensures that the outer wall of the sliding member 15 abuts against the lifting sleeve 16. The bottom area of ​​the lifting sleeve 16 that contacts the sliding member 15 is small. When the push plate 14 does not press the sliding member 15, the sliding member 15 is pressed by the end of the lifting sleeve 16, and the sliding member 15 moves away from the valve stem 34. Moreover, the sliding member 15 is a sphere, and its outer wall that abuts against the end of the lifting sleeve 16 is an arc surface. Its height in the vertical direction varies to a certain extent. When the outer wall of the sliding member 15 abuts against the outer wall of the valve stem 34, the outer wall at the highest point of the sliding member 15 will abut against the bottom surface of the lifting sleeve 16, thereby causing the position of the lifting sleeve 16 in the vertical direction to change.

[0091] Reference Figures 1-3 In one embodiment of the present invention, the valve body 31 is divided into two flow channels, which are connected by a through hole; a valve seat 32 is installed inside the through hole, and a sealing gasket is provided at the contact position between the valve seat 32 and the through hole; and a valve core 33 cooperates with the valve seat 32, which can block the internal channel of the valve seat 32.

[0092] The valve body 31 is a cast or machined metal shell, which is divided into a first flow channel and a second flow channel by a partition. The two flow channels are arranged in parallel or cross layout. A through hole is located in the center of the partition, connecting the first flow channel and the second flow channel. The hole diameter ranges from 5 to 50 mm, and a stepped design is preferred to accommodate the installation of the valve seat 32.

[0093] The valve seat 32 has an annular structure and is fixed to the inner wall of the through hole by interference fit or threaded connection; the sealing gasket is embedded between the outer edge of the valve seat 32 and the contact surface of the through hole, and is made of fluororubber or polytetrafluoroethylene with an O-shaped or U-shaped cross section to ensure static sealing.

[0094] A conical or cylindrical channel is opened in the center of the valve seat 32, and the inner wall of the channel is polished to reduce fluid resistance.

[0095] The valve core 33 is a conical plug or a ball, and its material matches that of the valve seat 32. The surface is coated with a hard coating to enhance wear resistance. In the closed state, the valve core 33 is driven by the drive mechanism to press against the inner wall of the valve seat 32 channel, blocking the flow of fluid through line sealing or surface sealing. In the open state, the valve core 33 retracts, the channel is fully opened, and the fluid flows freely through the through hole.

[0096] Furthermore, a valve stem 34 is connected to the end of the valve core 33. The valve core 33 moves vertically with the valve stem 34, thereby controlling the flow rate of the fluid in the pipeline. The valve stem 34 passes through the valve body 31 and extends to the outside of the valve body 31.

[0097] The valve core 33 has a threaded hole at the end near the valve stem 34. A screw is connected to the lower end of the valve stem 34. The valve core 33 and the valve stem 34 are fixedly connected by the threaded engagement between the screw and the threaded hole to ensure that there is no loosening during the transmission of axial force.

[0098] The valve core 33 has a groove on its end face, and the valve stem 34 and the valve core 33 can also be fixedly connected by a pin and groove. Anti-rotation structure such as keyway or hexagonal surface is preferred to prevent the valve core 33 and valve stem 34 from rotating relative to each other.

[0099] Furthermore, a valve cap 35 is provided at the top of the valve body 31; a fixing bracket 36 is installed on the top of the valve cap 35; and the base 11 is installed on the top of the valve cap 35 through the fixing bracket 36.

[0100] It should be noted that the valve cap 35 is a flange structure, and its material is compatible with that of the valve body 31. The valve cap 35 is fixed to the top of the valve body 31 by bolts. The inner wall of the valve cap 35 is provided with an annular sealing groove and an O-ring seal inside to ensure the static seal between the valve cap 35 and the valve body 31.

[0101] The mounting bracket 36 is a U-shaped or cross-shaped bracket, and its bottom is fixed to the flange face on the top of the valve cap 35 by bolts; the flange face is provided with a locating pin hole, which cooperates with the locating pin of the mounting bracket 36 to ensure coaxial installation.

[0102] The base 11 has a square or round structure. The bottom of the base 11 is provided with mounting holes that match the fixing frame 36. The bottom of the base 11 is connected to the top of the fixing frame 36 by passing high-strength bolts through the mounting holes. Anti-vibration pads, such as rubber or polyurethane, are installed between the base 11 and the fixing frame 36 to reduce the transmission of mechanical vibration.

[0103] Finally, it should be noted that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways as long as they do not depart from the scope of the present invention.

[0104] Importantly, the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A flow regulation device for thermal control pipelines in a power plant, characterized in that: include, The limiting unit (1) includes a base (11), a rotating sleeve (12) is provided on the end face of the base (11), a first screw (13) is provided on the inner side of the rotating sleeve (12) and threadedly engaged therewith, and a push plate (14) is provided on the inner wall of the rotating sleeve (12) and rotates synchronously therewith; a sliding member (15) is provided on the inner side of the push plate (14) and a lifting sleeve (16) is nested inside the first screw (13); A valve stem (34) is inserted inside the base (11). The base (11) has a sliding groove (111) inside and a conical groove (112) located in the center of the base (11). The sliding member (15) moves along the trajectory of the inner wall of the sliding groove (111). The rotating sleeve (12) rotates and drives the push plate (14) to press the sliding member (15). The sliding member (15) moves to the inner wall of the conical groove (112) and abuts against the outer wall of the valve stem (34).

2. The flow regulation device for thermal control pipelines in a power plant according to claim 1, characterized in that: The number of the slide grooves (111) is multiple sets, and the multiple sets of slide grooves (111) are distributed in a circumferential array along the axis of the conical groove (112); The number of push plates (14) is adapted to the number of slides (111); The projection of the inner wall of the push plate (14) along the axial direction of the base (11) is a curved arc. The first end of the projection of the push plate (14) is close to the inner wall of the base (11), and the second end of the projection of the push plate (14) is far away from the inner wall of the base (11).

3. The flow regulation device for thermal control pipelines in a power plant according to claim 2, characterized in that: The outer wall of the sliding member (15) abuts against the inner wall of the conical groove (112); The sliding member (15) moves in the same direction as the valve stem (34) by friction.

4. The flow regulation device for thermal control pipelines in a power plant according to claim 3, characterized in that: It also includes, The positioning unit (2) includes a support rod (21) disposed at the end of the lifting sleeve (16) away from the rotating sleeve (12), a connecting rod (22) disposed inside the support rod (21), a second screw (23) connected to the connecting rod (22), a support frame (25) disposed on the outer circumference of the support rod (21), and a handwheel (26) disposed on the inner side of the top of the support frame (25). The handwheel (26) is threadedly engaged with the second screw (23), and the handwheel (26) is connected to the support frame (25) via a bearing; The handwheel (26) rotates, causing the second screw (23) to move in the vertical direction.

5. The flow regulation device for thermal control pipelines in a power plant according to claim 4, characterized in that: The positioning unit (2) also includes an elastic element (24) sleeved inside the connecting rod (22) and a reciprocating element (27) disposed inside the support frame (25). The elastic element (24) is used to lift the valve stem (34) and push the valve stem (34) so ​​that the top of the valve stem (34) is in contact with the top of the inner wall of the connecting rod (22).

6. The flow regulation device for thermal control pipelines in a power plant according to claim 5, characterized in that: The bottom of the handwheel (26) can abut against the reciprocating part (27), and the bottom of the handwheel (26) is provided with multiple sets of positioning grooves (261) that cooperate with the reciprocating part (27). The lifting sleeve (16) abuts against the support rod (21); The sliding member (15) pushes the lifting sleeve (16) to move, thereby causing the support rod (21) to abut against the reciprocating member (27).

7. A flow regulation device for thermal control pipelines in a power plant according to claim 6, characterized in that: It also includes, The valve body (31) is divided into two flow channels, which are connected by a through hole. Valve seat (32), the valve seat (32) is installed inside the through hole, and a sealing gasket is provided at the contact position between the valve seat (32) and the through hole; The valve core (33) cooperates with the valve seat (32) and the valve core (33) can block the internal passage of the valve seat (32).

8. The flow regulation device for thermal control pipelines in a power plant according to claim 7, characterized in that: The valve core (33) is connected to the valve stem (34) at its end. The valve core (33) moves vertically along with the valve stem (34) to control the flow rate of the fluid in the pipeline. The valve stem (34) passes through the valve body (31) and extends to the outside of the valve body (31).

9. A flow regulation device for thermal control pipelines in a power plant according to claim 8, characterized in that: A valve cap (35) is provided at the top of the valve body (31); A fixing bracket (36) is installed on the top of the valve cap (35); The base (11) is mounted on top of the valve cap (35) via the fixing bracket (36).

10. A flow regulation device for thermal control pipelines in a power plant according to claim 9, characterized in that: The first screw (13) is fixedly connected to the fixing frame (36); The support frame (25) is fixedly connected to the fixing frame (36).

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