A wear-resistant large flow control valve

Abstract

The present invention relates to the technical field of control valves, and specifically to a wear-resistant large flow control valve, comprising a valve body, a first valve seat, a second valve seat and a valve stem, one end of the valve stem is connected to a valve plate, the valve plate and the first valve seat and the second valve seat are sealed to block a fluid passage, the valve plate comprises a first valve plate and a second valve plate, the first valve plate and the second valve plate are arranged face to face along the radial direction of the valve stem, and can move relative to or away from each other along the radial direction of the valve stem, a first elastic member for driving the first valve plate and the second valve plate to approach each other in an initial state is provided between the first valve plate and the second valve plate, a supporting mechanism is provided in the valve body, when the valve stem drives the first valve plate and the second valve plate to approach the first valve seat and the second valve seat, the supporting mechanism opens the first valve plate and the second valve plate along the radial direction of the valve stem, so that the first valve plate and the second valve plate move away from each other, and the first valve plate and the first valve seat, the second valve plate and the second valve seat are squeezed and matched to achieve sealing. The present invention solves the problem that the valve seat is easily worn and the sealing fails.

Description

Technical Field

[0001] The invention relates to the technical field of control valves, and in particular to a wear-resistant large-flow control valve. Background Art

[0002] In the control valve of the prior art, the valve plate rises and moves down to realize the opening and closing of the control valve. When the control valve is closed, the valve plate moves down and squeezes and contacts with the valve seats on the left and right sides respectively, thereby achieving a sealing effect. However, after the valve plate repeatedly rises and moves down for a long time, there will be a large amount of extrusion wear between the valve plate and the valve seats on the left and right sides, which is easy to cause sealing failure. Summary of the invention

[0003] The invention provides a wear-resistant large flow control valve to solve the technical problem that the valve plate and the valve seat of the control valve in the prior art are prone to seal failure.

[0004] A wear-resistant large flow control valve of the present invention adopts the following technical solution:

[0005] A wear-resistant large flow control valve comprises a valve body with a fluid passage, one end of the valve body is a fluid inlet, and the other end is a fluid outlet, a first valve seat and a second valve seat are arranged on the fluid passage in the valve body, a valve stem is movably installed in the valve body, one end of the valve stem is connected to a valve plate, the valve stem can drive the valve plate to move along the axial direction of the valve stem, so that the valve plate and the first valve seat and the second valve seat are sealed and matched to block the fluid passage, the valve plate comprises a first valve plate and a second valve plate, the first valve plate and the second valve plate are arranged face to face along the radial direction of the valve stem, and can move relative to or away from each other along the radial direction of the valve stem, a first elastic member for driving the first valve plate and the second valve plate to approach each other in an initial state is arranged between the first valve plate and the second valve plate, and a supporting mechanism is arranged in the valve body, when the valve stem drives the first valve plate and the second valve plate to approach the first valve seat and the second valve seat, the supporting mechanism opens the first valve plate and the second valve plate in the radial direction of the valve stem, so that the first valve plate and the second valve plate move away from each other, the first valve plate squeezes the first valve seat to achieve sealing cooperation, and the second valve plate squeezes the second valve seat to achieve sealing cooperation.

[0006] Furthermore, the supporting mechanism comprises a supporting boss, a first half sleeve and a second half sleeve, the first half sleeve and the second half sleeve forming a sleeve when matched, the sleeve being located between the first valve plate and the second valve plate, one end of the first half sleeve and the second half sleeve being respectively connected to the valve stem, and the other end being respectively connected to the first valve plate and the second valve plate, a first guiding slope being arranged on the inner wall of the first half sleeve, and a second guiding slope being arranged on the inner wall of the second half sleeve, when the valve stem drives the first valve plate and the second valve plate to approach the first valve seat and the second valve seat, the supporting boss extends into between the first half sleeve and the second half sleeve, the supporting boss pushes and cooperates with the first guiding slope and the second guiding slope respectively, so that the first half sleeve and the second half sleeve move opposite to each other along the radial direction of the valve stem, and the first half sleeve and the second half sleeve push the first valve plate and the second valve plate respectively to squeeze and cooperate with the first valve seat and the second valve seat.

[0007] Furthermore, the first half sleeve and the second half sleeve are movably arranged between the first valve plate and the second valve plate along the axial direction of the sleeve, a ring is provided on the valve stem, and a guide support arm extending along the moving direction of the first half sleeve and the second half sleeve is provided on the outer circumferential surface of the ring, and the first half sleeve and the second half sleeve are provided with guide through holes at one end respectively, and the guide support arms are respectively penetrated through the guide through holes of the first half sleeve and the second half sleeve, and a second elastic member is respectively connected between the end of the first half sleeve away from the valve stem and the first valve plate, and between the end of the second half sleeve away from the valve stem and the second valve plate, and the valve stem is connected to the first valve plate and the second valve plate respectively through the first half sleeve, the second half sleeve and the second elastic member.

[0008] Furthermore, the ring is movably mounted on the valve stem, and a stop flange is provided at one end of the valve stem, one side of the stop flange is used to cooperate with the ring for stopping, and the other side of the stop flange is used to push and cooperate with the end faces of the first half sleeve and the second half sleeve, so that the valve stem can push the first half sleeve and the second half sleeve to move.

[0009] Furthermore, the first guide bevel and the second guide bevel are staggered along the axial direction of the sleeve. When the supporting boss is pushed and matched with the first guide bevel and the second guide bevel, the first guide bevel is pushed and matched with the supporting boss before the second guide bevel, so that the first valve plate is first sealed and matched with the first valve seat, and the second valve plate is then sealed and matched with the second valve seat. The first valve plate and the first valve seat are close to the fluid inlet, and the second valve plate and the second valve seat are close to the fluid outlet. A piston plate is provided in the valve body above the valve plate, and the outer edge of the piston plate is sealed and slidably connected to the inner wall of the valve body. The piston plate is provided with a valve stem through hole in the middle part, and the valve stem is movably inserted in the valve stem through hole. A boss is provided on the valve stem above the piston plate. When the first valve plate is sealed with the first valve seat, and the second valve plate is sealed with the second valve seat, the first half sleeve and the second half sleeve are radially staggered with the stop flange, and the valve stem can continue to move downward, and the stop flange can enter between the first half sleeve and the second half sleeve. When the valve stem continues to move downward, the boss drives the piston plate to move downward, and the downward movement of the piston plate can increase the pressure in the valve body space between the first valve plate and the second valve plate.

[0010] Furthermore, the valve body includes a lower valve body of a T-shaped structure and a valve cover connected to the lower valve body, the lower valve body includes a cylindrical tube body extending laterally and a square cylinder connected to the middle of the cylindrical tube body, the square cylinder body extends vertically, the valve cover is connected to the top of the square cylinder body, one end of the cylindrical tube body is a fluid inlet, and the other end is a fluid outlet, the internal space of the cylindrical tube body is connected to the internal space of the square cylinder body, and the first valve seat and the second valve seat are arranged in the cylindrical tube body.

[0011] Furthermore, a first pressure gauge is provided on the cylindrical tube body near the fluid inlet, and the first pressure gauge is used to detect the fluid pressure at the fluid inlet. A second pressure gauge is provided on the side wall of the square cylinder, and the second pressure gauge detects the pressure in the valve body space between the first valve plate and the second valve plate after the first valve plate is sealed with the first valve seat and the second valve plate is sealed with the second valve seat.

[0012] Furthermore, a guide groove extending vertically is provided on the inner wall of the square cylinder, and guide protrusions are correspondingly provided on the first valve plate and the second valve plate. When the first valve plate and the second valve plate leave the first valve seat and the second valve seat, the guide protrusions on the first valve plate and the second valve plate are aligned and cooperate with the guide groove.

[0013] Furthermore, the valve stem is provided with an external thread, and a rotating handwheel is connected to the valve stem via the external thread. The rotating handwheel is rotatably mounted on the valve body, and the rotation of the rotating handwheel can drive the valve stem to move axially.

[0014] Furthermore, the end faces of the first valve seat and the first valve plate that are sealed together are arranged tilted, and the end faces of the second valve seat and the second valve plate that are sealed together are arranged tilted.

[0015] The beneficial effects of the present invention are as follows: the present invention sets a first valve plate and a second valve plate that can move relative to or opposite to each other along the flow direction of the fluid. Before the first valve plate and the second valve plate are sealed with the first valve seat and the second valve seat respectively, the first valve plate and the second valve plate are not in contact with the first valve seat and the second valve seat. After the first valve plate and the second valve plate are lowered to positions corresponding to the first valve seat and the second valve seat, the first valve plate and the second valve plate are propped open by a supporting mechanism, so that the first valve plate squeezes the first valve seat to achieve a sealing fit, and the second valve plate squeezes the second valve seat to achieve a sealing fit. After the present invention is set up in this way, during the up and down reciprocating movement of the first valve plate and the second valve plate, the first valve plate, the second valve plate, the first valve seat and the second valve seat are not in contact, and there is no squeezing force between each other, so there will be no wear due to squeezing, and thus there will be no failure due to wear.

[0016] Furthermore, in order to ensure the sealing performance of the first valve plate and the second valve plate, the present invention first allows the first valve plate located upstream to be squeezed and sealed with the first valve seat, and then allows the second valve plate located downstream to be squeezed and sealed with the second valve seat. In this way, when the first valve plate is first sealed with the first valve seat, since the second valve plate has not yet been sealed with the second valve plate at this time, the chamber between the first valve plate and the second valve plate in the valve body is connected to the fluid outlet, and the fluid between the first valve plate and the second valve plate will flow out from the fluid outlet, and a certain gap will appear in the chamber between the first valve plate and the second valve plate. In this way, after the first valve plate and the second valve plate are respectively sealed with the first valve seat and the second valve seat, the space between the first valve plate and the second valve plate can be compressed by continuing to move the valve stem downward to drive the piston plate downward, so that the pressure difference on both sides of the first valve plate and the second valve plate can be at an average level, thereby reducing the possibility of sealing failure caused by the large pressure difference on both sides of the two valve plates. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 It is a three-dimensional structural schematic diagram of an embodiment of a wear-resistant large flow control valve of the present invention;

[0019] Figure 2 It is a front view of an embodiment of a wear-resistant large flow control valve of the present invention;

[0020] Figure 3 An exploded view of an embodiment of a wear-resistant large flow control valve of the present invention;

[0021] Figure 4 A cross-sectional view of an embodiment of a wear-resistant large flow control valve of the present invention (a state in which the valve plate is away from two valve seats);

[0022] Figure 5 A cross-sectional view of an embodiment of a wear-resistant large flow control valve of the present invention (a state in which the valve plate is moved downward and the valve plate is not opened);

[0023] Figure 6 A cross-sectional view of an embodiment of a wear-resistant large flow control valve of the present invention (two valve plates are respectively sealed with two valve seats, and the piston plate is moved downward);

[0024] Figure 7 for Figure 4 A front view of

[0025] Figure 8 for Figure 5 A front view of

[0026] Fig. 9 for Figure 6 A front view of

[0027] Fig.10 It is a schematic diagram of the connection between the valve stem and the first half sleeve and the second half sleeve in an embodiment of a wear-resistant large flow control valve of the present invention;

[0028] Fig.11 for Fig.10 Exploded diagram of

[0029] In the figure: 101, lower valve body; 102, valve cover; 103, sealing sleeve; 104, rotating hand wheel; 105, valve stem; 106, first pressure gauge; 107, second pressure gauge; 108, top support boss; 201, first valve seat; 202, second valve seat; 203, first valve plate; 204, second valve plate; 205, first half sleeve; 206, second half sleeve; 207, first spring I; 208, first spring II; 209, second spring I; 210, second spring II; 211, collar; 301, piston plate. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] An embodiment of a wear-resistant large flow control valve of the present invention is as follows Figures 1 to 11 As shown, the wear-resistant large flow control valve includes a valve body with a fluid passage, and also includes a first valve seat 201, a second valve seat 202, a first valve plate 203, a second valve plate 204 and a valve stem 105 installed in the valve body. One end of the valve body is a fluid inlet, and the other end is a fluid outlet. Figures 7 to 9 Taking the middle direction as an example, the left end of the valve body is the fluid inlet, and the right end of the valve body is the fluid outlet.

[0032] Regarding the structure of the valve body, in this embodiment, the valve body includes a lower valve body 101 of a T-shaped structure, and a valve cover 102 connected to the lower valve body 101. The lower valve body 101 includes a cylindrical tube body, and also includes a square cylinder connected to the middle of the cylindrical tube body. Assuming that the left and right directions in the figure are horizontal and the up and down directions are vertical, the cylindrical tube body extends horizontally and the square cylinder extends vertically. The interior of the cylindrical tube body forms the fluid channel, the first valve seat 201 and the second valve seat 202 are both arranged in the cylindrical tube body and located on the fluid channel, the left end of the cylindrical tube body constitutes a fluid inlet, and the right end constitutes a fluid outlet. The valve cover 102 is connected to the top of the square cylinder, the internal space of the square cylinder is connected to the internal space of the cylindrical tube body, and the valve stem 105 is movably mounted on the valve cover 102. In this embodiment, the first valve seat 201 and the second valve seat 202 can be detachably installed in the cylindrical tube body.

[0033] In the present invention, the valve stem 105 is movably installed in the valve body and can reciprocate along the axial direction of the valve stem 105. In this embodiment, the valve stem 105 is moved up and down by rotating the rotary handwheel 104. Specifically, the valve stem 105 is provided with an external thread, and the valve stem 105 is connected with the rotary handwheel 104 through the external thread. The rotary handwheel 104 is rotatably installed on the valve body through the sealing sleeve 103. The rotation of the rotary handwheel 104 can drive the valve stem 105 to move axially. The first valve plate 203 and the second valve plate 204 are connected to the lower end of the valve stem 105. The valve stem 105 moves up and down to drive the first valve plate 203 and the second valve plate 204 to move up and down. The first valve plate 203 and the second valve plate 204 are arranged face to face along the radial direction of the valve stem 105, and the two constitute a valve plate for blocking the fluid channel. When the valve stem 105 moves up and down along the axial extension direction, it drives the first valve plate 203 and the second valve plate 204 to move up and down, so that the first valve plate 203 and the second valve plate 204 are away from the first valve seat 201 and the second valve seat 202, or are sealed with the first valve seat 201 and the second valve seat 202 respectively, thereby realizing the switching of the control valve.

[0034] In the present invention, the first valve plate 203 and the second valve plate 204 can move relative to or away from each other along the radial direction of the valve stem 105, and a first elastic member for driving the first valve plate 203 and the second valve plate 204 to approach each other in the initial state is provided between the first valve plate 203 and the second valve plate 204. In this embodiment, the first elastic member is a first spring, and two groups are provided in front and back, namely, a first spring I 207 and a first spring II 208, and the two ends of the first spring I 207 and the first spring II 208 are connected to the first valve plate 203 and the second valve plate 204 respectively. The valve body is also provided with a supporting mechanism, which radially spreads the first valve plate 203 and the second valve plate 204 along the valve stem 105 when the valve stem 105 drives the first valve plate 203 and the second valve plate 204 to move downward, that is, when the first valve plate 203 and the second valve plate 204 are close to the first valve seat 201 and the second valve seat 202, so that the first valve plate 203 and the second valve plate 204 move away from each other. At this time, the first valve plate 203 moves to the left and is pressed against the first valve seat 201 to achieve a sealing fit, and the second valve plate 204 moves to the right and is pressed against the second valve seat 202 to achieve a sealing fit.

[0035] Regarding the specific structure of the supporting mechanism, in this embodiment, the supporting mechanism includes a supporting boss 108, a first half sleeve 205 and a second half sleeve 206, wherein the supporting boss 108 is fixed on the bottom wall of the valve body, the first half sleeve 205 and the second half sleeve 206 are located between the first valve plate 203 and the second valve plate 204, the first half sleeve 205 and the second half sleeve 206 can move relative to or opposite to each other along the radial direction of the valve stem 105, and the first half sleeve 205 and the second half sleeve 206 form a sleeve when they are matched, and the interior of the sleeve is hollow. The upper ends of the first half sleeve 205 and the second half sleeve 206 are respectively connected to the valve stem 105, and the other ends are respectively connected to the first valve plate 203 and the second valve plate 204. Regarding the connection structure between the first half sleeve 205, the second half sleeve 206, the valve stem 105 and the valve plate, in this embodiment, a ring 211 is provided on the valve stem 105, and a guide support arm extending along the moving direction of the first half sleeve 205 and the second half sleeve 206 is provided on the outer peripheral surface of the ring 211, and the first half sleeve 205 and the second half sleeve 206 are provided with guide through holes at one end respectively, and the guide support arms are respectively penetrated in the guide through holes of the first half sleeve 205 and the second half sleeve 206, and the first half sleeve 205 and the second half sleeve 206 are connected to the valve stem 105 through the ring 211. A second elastic member is connected between the first half sleeve 205 and the first valve plate 203 and between the second half sleeve 206 and the second valve plate 204, respectively. The second elastic member is a second spring. Specifically, a second spring I 209 is connected between the end of the first half sleeve 205 away from the valve stem 105 and the first valve plate 203, and a second spring II 210 is connected between the end of the second half sleeve 206 away from the valve stem 105 and the second valve plate 204. The valve stem 105 is connected to the first valve plate 203 and the second valve plate 204 through the first half sleeve 205, the second half sleeve 206 and the second spring I 209 and the second spring II 210, respectively.

[0036] A first guiding slope is provided on the inner wall of the first half sleeve 205, and a second guiding slope is provided on the inner wall of the second half sleeve 206. When the valve stem 105 drives the first valve plate 203 and the second valve plate 204 to approach the first valve seat 201 and the second valve seat 202, the supporting protrusion 108 extends into between the first half sleeve 205 and the second half sleeve 206, and the supporting protrusion 108 pushes and cooperates with the first guiding slope and the second guiding slope respectively, so that the first half sleeve 205 and the second half sleeve 206 move opposite to each other along the radial direction of the valve stem 105, and the first half sleeve 205 and the second half sleeve 206 push the first valve plate 203 and the second valve plate 204 respectively to be squeezed and fitted with the first valve seat 201 and the second valve seat 202. When the valve stem 105 moves downward, the valve stem 105 drives the first half sleeve 205, the second half sleeve 206, the first valve plate 203 and the second valve plate 204 to move downward. When the top support boss 108 extends between the first half sleeve 205 and the second half sleeve 206 and pushes the first half sleeve 205 and the second half sleeve 206 outward, the first half sleeve 205 and the second half sleeve 206 move opposite to each other along the extension direction of the guide support arm. When the valve stem 105 moves upward, the guide support arm moves the first half sleeve 205 and the second half sleeve 206 upward, and when the first half sleeve 205 and the second half sleeve 206 leave the top support boss 108, the first elastic member drives the first valve plate 203 and the second valve plate 204 and the first half sleeve 205 and the second half sleeve 206 to approach each other.

[0037] In this embodiment, the first half sleeve 205 and the second half sleeve 206 are axially movably arranged between the first valve plate 203 and the second valve plate 204, the collar 211 is movably sleeved on the valve stem 105, and one end of the valve stem 105 is provided with a stop flange, the upper side of the stop flange is used to stop with the collar 211, and the lower side of the stop flange is pushed with the top end surface of the two half sleeves when the two half sleeves are matched, so that the valve stem 105 can push the two half sleeves downward to move downward. The present invention arranges the two half sleeves axially movably between the first valve plate 203 and the second valve plate 204, and connects the two half sleeves and the first valve plate 203 and the second valve plate 204 through the second elastic member, so that the first valve plate 203 and the second valve plate 204 can be elastically contacted with the bottom wall of the valve body, avoiding direct rigid contact and structural damage.

[0038] In this embodiment, the first guide bevel and the second guide bevel are arranged staggered along the axial direction of the sleeve, specifically, the first guide bevel is located below the second guide bevel. After such arrangement, when the supporting protrusion 108 pushes and cooperates with the first guide bevel and the second guide bevel, the first guide bevel pushes and cooperates with the supporting protrusion 108 before the second guide bevel, so that the first valve plate 203 first moves to the left to squeeze the first valve seat 201 to achieve sealing cooperation, and then the second valve plate 204 moves to the right to squeeze the second valve seat 202 to achieve sealing cooperation. That is to say, in this embodiment, the first valve plate 203 and the first valve seat 201 near the fluid inlet are closed first, and then the second valve plate 204 and the second valve seat 202 near the fluid outlet are closed, and the first valve plate 203 and the second valve plate 204 are closed. After 204 is sealed with the first valve seat 201 and the second valve seat 202 respectively, the valve body space located upstream of the first valve plate 203 is the inlet chamber, the valve body space located between the first valve plate 203 and the second valve plate 204 is the valve stem chamber, and the valve body space located downstream of the second valve plate 204 is the outlet chamber. Compared with closing the first valve plate 203 and the second valve plate 204 at the same time, closing the first valve plate 203 and the second valve plate 204 one after another can reduce the pressure of the valve body space between the first valve plate 203 and the second valve plate 204, thereby making the pressure in the valve stem chamber lower when the control valve is in the closed state.

[0039] Furthermore, a piston plate 301 is provided in the valve body above the valve plate, and the outer edge of the piston plate 301 is sealingly and slidingly matched with the inner wall of the valve body. A valve stem through hole is opened in the middle of the piston plate 301, and the valve stem 105 is movably inserted in the valve stem through hole. A boss is provided on the valve stem 105 above the piston plate 301. When the first valve plate 203 is sealed with the first valve seat 201, and the second valve plate 204 is sealed with the second valve seat 202, the first half sleeve 205 and the second half sleeve 206 are radially staggered from the stop flange, and the valve stem 105 can continue to move downward, and the stop flange can move downward into between the first half sleeve 205 and the second half sleeve 206. When the valve stem 105 continues to move downward, the boss drives the piston plate 301 to move downward. At this time, the valve body space between the first valve plate 203 and the second valve plate 204 is a closed chamber, and the first valve plate 203 is first squeezed and sealed with the first valve seat 201. As the fluid flows out from the fluid outlet, a certain amount of air will enter the valve stem chamber between the first valve plate 203 and the second valve plate 204. When the piston plate 301 moves downward, the air can be compressed to increase the pressure in the closed valve stem chamber.

[0040] Furthermore, a first pressure gauge 106 is provided at a position near the fluid inlet on the cylindrical tube body. The first pressure gauge 106 is used to detect the fluid pressure at the fluid inlet, that is, the first pressure gauge 106 is used to detect the fluid pressure at the upstream position of the first valve plate 203. A second pressure gauge 107 is provided on the side wall of the square cylinder body. After the first valve plate 203 is sealed with the first valve seat 201 and the second valve plate 204 is sealed with the second valve seat 202, the second pressure gauge 107 detects the pressure in the valve body space between the first valve plate 203 and the second valve plate 204, that is, the second pressure gauge 107 is used to detect the pressure in the closed valve stem chamber. In this embodiment, the downward movement stroke of the piston plate 301 is determined according to the data displayed by the first pressure gauge 106 and the second pressure gauge 107. The value detected by the first pressure gauge 106 is P1, and the value detected by the second pressure gauge 107 is P2. When the piston plate 301 is moved downward, P2 is equal to half of P1. After the first valve plate 203 and the second valve plate 204 are squeezed and sealed with the first valve seat 201 and the second valve seat 202 respectively, the pressure P3 downstream of the second valve plate 204 is basically zero at this time. In this way, after the piston plate 301 moves down to its position, the pressure P1 upstream of the first valve plate 203, the pressure P2 between the first valve plate 203 and the second valve plate 204, and the pressure P3 downstream of the second valve plate 204 decrease in steps, and P2 is half of the difference between P1 and P3. The advantage of such a setting is that the pressure difference between the left and right sides of the first valve plate 203 and the pressure difference between the left and right sides of the second valve plate 204 can be made uniform. Compared with the first valve plate 203 and the second valve plate 204 squeezing the first valve seat 201 and the second valve seat 202 for sealing at the same time, the pressure difference on the left and right sides of the first valve plate 203 and the left and right sides of the second valve plate 204 of the present invention is at an average level, thereby ensuring the sealing performance between the first valve plate 203, the second valve plate 204 and the first valve seat 201 and the second valve seat 202.

[0041] In this embodiment, a guide groove extending vertically is provided on the inner wall of the square cylinder of the valve body, and guide protrusions are provided on the first valve plate 203 and the second valve plate 204 respectively. When the first valve plate 203 and the second valve plate 204 leave the first valve seat 201 and the second valve seat 202 and are aligned together, the guide protrusions on the first valve plate 203 and the second valve plate 204 are aligned and matched with the guide grooves, so that the first valve plate 203 and the second valve plate 204 can be guided and limited during the up and down movement of the first valve plate 203 and the second valve plate 204. In this embodiment, the end faces of the first valve seat 201 and the first valve plate 203 that are sealed and matched are inclined, and the end faces of the second valve seat 202 and the second valve plate 204 that are sealed and matched are inclined. The inclined end faces can reduce the impact force of the fluid on the end faces.

[0042] Working process of the wear-resistant large flow control valve of the present invention:

[0043] When the control valve is in the open state, Figure 4 Figure 7 As shown, the first valve plate 203 and the second valve plate 204 are located above the first valve seat 201 and the second valve seat 202. At this time, the first valve plate 203 and the second valve plate 204 are matched together under the action of the first elastic member, and the first half sleeve 205 and the second half sleeve 206 are matched together. Under the action of the second elastic member, a part of the first half sleeve 205 and the second half sleeve 206 is located between the first valve plate 203 and the second valve plate 204, and the stop flange at the lower end of the valve stem 105 is matched with the top end surface of the first half sleeve 205 and the second half sleeve 206. When the control valve needs to be closed, the rotating hand wheel 104 is turned. The rotating hand wheel 104 rotates to drive the valve stem 105 to move downward in the axial direction. During the downward movement of the valve stem 105, the stop flange at the lower end of the valve stem 105 pushes the first half sleeve 205 and the second half sleeve 206 to move downward. At the same time, under the action of the second elastic member, the first valve plate 203 and the second valve plate 204 move downward synchronously. During the downward movement of the first valve plate 203 and the second valve plate 204, there is no contact between the first valve plate 203 and the second valve plate 204 and the first valve seat 201 and the second valve seat 202, and there is no squeezing force. In this way, during the repeated up and down movement of the first valve plate 203 and the second valve plate 204, there is no squeezing force, and thus no wear will occur, and the problem of sealing failure is not likely to occur.

[0044] When the first valve plate 203 and the second valve plate 204 move downward to a position facing the first valve seat 201 and the second valve seat 202, as shown in FIG. Figure 5 and Figure 8 As shown, the rotary hand wheel 104 continues to be rotated, and the valve stem 105 continues to descend, and the valve stem 105 drives the first half sleeve 205 and the second half sleeve 206 to continue to descend. During this process, the first half sleeve 205 first moves to the left under the action of the top support boss 108, and pushes the first valve plate 203 to move to the left, and the first valve plate 203 and the first valve seat 201 are squeezed to achieve sealing. Subsequently, the second half sleeve 206 moves to the right under the action of the top support boss 108, and pushes the second valve plate 204 to move to the right, and the second valve plate 204 and the second valve seat 202 are squeezed to achieve sealing.

[0045] When the first valve plate 203 and the first valve seat 201, and the second valve plate 204 and the second valve seat 202 are sealed, the first half sleeve 205 and the second half sleeve 206 are radially staggered from the stop flange at the lower end of the valve stem 105, and the rotary hand wheel 104 is continuously turned, and the valve stem 105 continues to move downward. After the valve stem 105 continues to move downward, the boss on the valve stem 105 will push the piston plate 301 downward, thereby compressing the air in the chamber between the first valve plate 203 and the second valve plate 204. As the piston plate 301 moves downward, the pressure value of the second pressure gauge 107 will gradually increase. By observing the values ​​displayed on the first pressure gauge 106 and the second pressure gauge 107, the value of the second pressure gauge 107 is equal to half of the value of the first pressure gauge 106, so that the pressure difference between the left and right sides of the first valve plate 203 and the left and right sides of the second valve plate 204 are substantially the same, and are at an average level.

[0046] If the control valve is to be opened again, the hand wheel 104 can be rotated in the opposite direction to drive the valve stem 105 to rise. During the rising process of the valve stem 105, the piston plate 301 is no longer pushed by the boss. When the stop flange at the lower end of the valve stem 105 rises to match the stop ring, the stop flange drives the ring to rise. The rise of the ring will drive the first half sleeve 205 and the second half sleeve 206 to rise. After the first half sleeve 205 and the second half sleeve 206 rise to a certain distance, the push boss will no longer push the first half sleeve 205 and the second half sleeve 206. Under the action of the first elastic member, the first valve plate 203, the second valve plate 204, the first half sleeve 205 and the second half sleeve 206 will be driven to move relative to each other and fit together. The valve stem 105 continues to rise, driving the first valve plate 203, the second valve plate 204, the first half sleeve 205 and the second half sleeve 206 away from the first valve seat 201 and the second valve seat 202, and the control valve is fully opened.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A wear-resistant large flow control valve, comprising a valve body with a fluid passage, one end of the valve body being a fluid inlet and the other end being a fluid outlet, a first valve seat (201) and a second valve seat (202) being provided in the valve body on the fluid passage, a valve stem (105) being movably mounted in the valve body, one end of the valve stem (105) being connected to a valve plate, the valve stem (105) being capable of driving the valve plate to move along the axial direction of the valve stem (105), so that the valve plate is sealed and cooperated with the first valve seat (201) and the second valve seat (202) to block the fluid passage, characterized in that: The valve plate comprises a first valve plate (203) and a second valve plate (204), the first valve plate (203) and the second valve plate (204) being arranged face to face along the radial direction of the valve stem (105) and being capable of moving relative to or away from each other along the radial direction of the valve stem (105), a first elastic member for driving the first valve plate (203) and the second valve plate (204) to approach each other in an initial state is provided between the first valve plate (203) and the second valve plate (204), a supporting mechanism is provided in the valve body, and when the valve stem (105) drives the first valve plate (203) and the second valve plate (204) to approach the first valve seat (201) and the second valve seat (202), the supporting mechanism radially supports the first valve plate (203) along the valve stem (105). and the second valve plate (204), so that the first valve plate (203) and the second valve plate (204) move back to back, the first valve plate (203) squeezes the first valve seat (201) to achieve a sealing fit, and the second valve plate (204) squeezes the second valve seat (202) to achieve a sealing fit, the supporting mechanism comprises a supporting protrusion (108), a first half sleeve (205) and a second half sleeve (206), the first half sleeve (205) and the second half sleeve (206) form a sleeve when they are matched, and the sleeve is located between the first valve plate (203) and the second valve plate (204), one end of the first half sleeve (205) and the second half sleeve (206) are respectively connected to the valve stem (105), and the other end is respectively connected to the first valve plate (203) and The first half sleeve (205) and the second half sleeve (206) are connected to each other, the inner wall of the first half sleeve (205) is provided with a first guiding inclined surface, and the inner wall of the second half sleeve (206) is provided with a second guiding inclined surface. When the valve stem (105) drives the first valve plate (203) and the second valve plate (204) to approach the first valve seat (201) and the second valve seat (202), the supporting protrusion (108) extends into between the first half sleeve (205) and the second half sleeve (206), and the supporting protrusion (108) pushes and cooperates with the first guiding inclined surface and the second guiding inclined surface respectively, so that the first half sleeve (205) and the second half sleeve (206) move in opposite directions along the radial direction of the valve stem (105). The first half sleeve (205) and the second half sleeve (206) are respectively The first valve plate (203) and the second valve plate (204) are pushed and pressed together with the first valve seat (201) and the second valve seat (202); the first half sleeve (205) and the second half sleeve (206) are movably arranged between the first valve plate (203) and the second valve plate (204) along the axial direction of the sleeve; a collar (211) is arranged on the valve stem (105); a guide support arm extending along the moving direction of the first half sleeve (205) and the second half sleeve (206) is arranged on the outer peripheral surface of the collar (211); a guide through hole is respectively arranged at one end of the first half sleeve (205) and the second half sleeve (206); the guide support arms are respectively inserted into the guide through holes of the first half sleeve (205) and the second half sleeve (206);A second elastic member is connected between one end of the first half sleeve (205) away from the valve stem (105) and the first valve plate (203), and between one end of the second half sleeve (206) away from the valve stem (105) and the second valve plate (204), respectively. The valve stem (105) is connected to the first valve plate (203) and the second valve plate (204) respectively through the first half sleeve (205), the second half sleeve (206) and the second elastic member. The collar (211) is movably sleeved on the valve stem (105). A stop flange is provided at one end of the valve stem (105). One side of the stop flange is used to engage with the collar (211). 1) Stopping cooperation, the other side of the stop flange is used for pushing cooperation with the end faces of the first half sleeve (205) and the second half sleeve (206), so that the valve stem (105) can push the first half sleeve (205) and the second half sleeve (206) to move, the first guide bevel and the second guide bevel are staggered along the axial direction of the sleeve, and when the supporting protrusion (108) pushes and cooperates with the first guide bevel and the second guide bevel, the first guide bevel pushes and cooperates with the supporting protrusion (108) before the second guide bevel, so that the first valve plate (203) is first sealed with the first valve seat (201), and the second valve seat (201) is sealed with the first valve plate (203). The valve plate (204) is sealed with the second valve seat (202) at the rear, the first valve plate (203) and the first valve seat (201) are close to the fluid inlet, and the second valve plate (204) and the second valve seat (202) are close to the fluid outlet; a piston plate (301) is provided in the valve body above the valve plate, the outer edge of the piston plate (301) is sealingly slidably matched with the inner wall of the valve body, a valve stem through hole is opened in the middle of the piston plate (301), the valve stem (105) is movably inserted into the valve stem through hole, and a boss is provided on the valve stem (105) above the piston plate (301). When the first valve plate After the first valve seat (201) and the second valve plate (204) are sealed with the second valve seat (202), the first half sleeve (205) and the second half sleeve (206) are radially offset from the stop flange, the valve stem (105) can continue to move downward, the stop flange can enter between the first half sleeve (205) and the second half sleeve (206), and the boss drives the piston plate (301) to move downward when the valve stem (105) continues to move downward. The downward movement of the piston plate (301) can increase the pressure in the valve body space between the first valve plate (203) and the second valve plate (204).

2. The wear-resistant large flow control valve according to claim 1, characterized in that: The valve body comprises a lower valve body (101) of a T-shaped structure and a valve cover (102) connected to the lower valve body (101); the lower valve body (101) comprises a cylindrical tube body extending in the transverse direction and a square cylinder body connected to the middle of the cylindrical tube body; the square cylinder body extends in the vertical direction; the valve cover (102) is connected to the top of the square cylinder body; one end of the cylindrical tube body is a fluid inlet and the other end is a fluid outlet; the internal space of the cylindrical tube body is connected to the internal space of the square cylinder body; the first valve seat (201) and the second valve seat (202) are arranged in the cylindrical tube body.

3. The wear-resistant large flow control valve according to claim 2, characterized in that: A first pressure gauge (106) is provided on the cylindrical tube body at a position close to the fluid inlet, and the first pressure gauge (106) is used to detect the fluid pressure at the fluid inlet. A second pressure gauge (107) is provided on the side wall of the square cylinder body, and the second pressure gauge (107) detects the pressure in the valve body space between the first valve plate (203) and the second valve plate (204) after the first valve plate (203) is sealed with the first valve seat (201) and the second valve plate (204) is sealed with the second valve seat (202).

4. The wear-resistant large flow control valve according to claim 2, characterized in that: A guide groove extending vertically is provided on the inner wall of the square cylinder, and guide protrusions are correspondingly provided on the first valve plate (203) and the second valve plate (204). When the first valve plate (203) and the second valve plate (204) leave the first valve seat (201) and the second valve seat (202), the guide protrusions on the first valve plate (203) and the second valve plate (204) are aligned and cooperate with the guide groove.

5. The wear-resistant large flow control valve according to claim 1, characterized in that: The valve stem (105) is provided with an external thread, and a rotating hand wheel (104) is connected to the valve stem (105) via the external thread. The rotating hand wheel (104) is rotatably mounted on the valve body, and the rotation of the rotating hand wheel (104) can drive the valve stem (105) to move axially.

6. The wear-resistant large flow control valve according to claim 1, characterized in that: The end surfaces of the first valve seat (201) and the first valve plate (203) that are sealed together are arranged tilted, and the end surfaces of the second valve seat (202) and the second valve plate (204) that are sealed together are arranged tilted.

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