T-shaped valve of negative-pressure fly ash removal system of power plant

Abstract

The invention discloses a T-shaped valve of a negative-pressure fly ash removal system of a power plant, which relates to the technical field of valves and comprises a first valve body, a second valve body fixed on the outer wall of the first valve body, a valve plate arranged in the first valve body and a rubber sealing ring arranged on the valve plate. The valve plate is arranged in the first valve body and is used for controlling a circulation path in the first valve body to be opened or closed; the driving mechanism is arranged on the first valve body and the second valve body and is used for driving the valve plate to rotate; the negative pressure pushing mechanism is arranged in the valve plate and used for improving the sealing performance of the rubber sealing ring and conducting self-adaptive compensation when the valve plate is closed, and the cleaning mechanism is arranged outside the first valve body and used for cleaning the outer surface of the rubber sealing ring when the valve plate is closed. And meanwhile, when the valve plate is closed, the sealing performance of the rubber sealing ring can be improved, and compensation is conducted when slight abrasion occurs on the surface of the rubber sealing ring.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and specifically to a T-valve for a negative pressure ash removal system of fly ash in a power plant. Background Art

[0002] The negative pressure ash removal system for fly ash in a power plant is an efficient and environmentally friendly fly ash treatment method, which is widely used in the ash collection and transportation of coal-fired power plants. It uses negative pressure air flow to collect and transport fly ash from power generation equipment (such as electrostatic precipitators, boiler ash hoppers, etc.) to the ash silo. The fly ash flows in a closed pipeline, avoiding dust leakage and reducing environmental pollution. It adopts dry transportation, saving a large amount of water resources compared with the traditional hydraulic ash removal method. A negative pressure environment is formed inside the system through a vacuum pump or a negative pressure fan, so that external air is mixed with the fly ash. The fly ash is sucked into the pipeline under the action of negative pressure and transported to the ash silo with the air flow. After reaching the ash silo, the fly ash is separated from the air through devices such as a cyclone dust collector and a bag dust collector. The separated air is discharged after purification, and the fly ash is collected and stored.

[0003] In the negative pressure ash removal system, a T-valve is needed to control the transportation of fly ash. The valve plate in the valve body is rotated through an electric device to control the flow or closing of the fly ash transportation.

[0004] In the prior art, when using a T-valve to control the opening or closing of the fly ash flow path, since the fly ash may contain high-hardness particles, such as alumina, silicon powder, etc. with strong scouring ability, the fly ash transportation will cause wear on the sealing ring on the outer wall of the valve plate. And when the valve plate closes instantaneously, the high-hardness particles in the fly ash are sandwiched between the sealing ring and the inner wall of the valve body, which will not only damage the sealing ring, but also cause a small gap between the sealing ring and the valve body, thus reducing the sealing performance of the sealing ring.

[0005] In view of the above problems, there is an urgent need to innovate and design on the basis of the original T-valve. Summary of the Invention

[0006] The technical solution of the present invention aims at the technical problem that the solution of the prior art is too single, and provides a solution significantly different from the prior art. Specifically, the purpose of the present invention is to provide a T-valve for a negative pressure ash removal system of fly ash in a power plant to solve the problem that the high-hardness particles in the fly ash proposed in the above background art will cause wear on the sealing ring and reduce the sealing performance of the sealing ring.

[0007] To achieve the above object, the present invention provides the following technical solution: A T-shaped valve for a negative pressure ash removal system of power plant fly ash, including a first valve body, a second valve body fixed to the outer wall of the first valve body, a valve plate disposed inside the first valve body, and a rubber sealing ring disposed on the valve plate, characterized in that: it further includes a valve plate disposed inside the first valve body for controlling the opening or closing of the flow path inside the first valve body, a driving mechanism disposed on the first valve body and the second valve body for driving the valve plate to rotate, a negative pressure pushing mechanism disposed inside the valve plate for improving the sealing performance of the rubber sealing ring and self-adaptively compensating when the valve plate is closed, and a cleaning mechanism disposed outside the first valve body for cleaning the outer surface of the rubber sealing ring when the valve plate is closed; An annular groove that fits with the rubber sealing ring is provided on the outer surface of the valve plate.

[0008] Preferably, the driving mechanism includes a servo motor installed on the top of the second valve body, the output end of the servo motor is connected with a rotating shaft that penetrates into the first valve body, and the end of the rotating shaft penetrates through the rubber sealing ring and is fixed to the top of the valve plate.

[0009] Preferably, the rubber sealing ring fits with the inner wall of the first valve body, and both sides of the rubber sealing ring are fixed to the inner wall of the annular groove.

[0010] Preferably, the negative pressure pushing mechanism includes a groove opened on the outer wall of one side of the valve plate, communication grooves are equiangularly opened on the inner wall of the groove, chambers corresponding to and communicating with the communication grooves are equiangularly opened inside the valve plate, a first spring is fixedly connected to the inner wall of the chamber near the center of the valve plate, a first piston slidably matched with the chamber is fixed to the end of the first spring, and a pushing component is arranged between the first piston and the rubber sealing ring.

[0011] Preferably, the pushing component includes a connecting plate disposed inside the chamber, a push column is connected between the outer wall of the connecting plate and the inner wall of the rubber sealing ring, a fixing rod is fixedly arranged on the inner wall of the chamber between the first piston and the connecting plate, a rotating rod is inclined and rotatably connected to the outer wall of the fixing rod, sliding seats located at both ends of the rotating rod are respectively arranged on the outer walls of the first piston and the connecting plate, chutes are opened inside the sliding seats, and sliding columns slidably matched with the chutes are respectively fixed to the outer walls of both ends of the rotating rod.

[0012] Preferably, limiting columns are symmetrically arranged on the outer wall of the connecting plate, and limiting grooves slidably matched with the limiting columns are opened on the inner wall of the chamber.

[0013] Preferably, the cleaning mechanism includes cylinders arranged equiangularly on the outer wall of the first valve body, a first one-way communicator is installed and communicated on one side outer wall of the cylinder, a first communication pipe is connected between the port of the first one-way communicator and the second valve body, and a second one-way communicator is installed and communicated on the other side outer wall of the cylinder.

[0014] Preferably, the cleaning mechanism further includes a second piston disposed inside the cylinder body and slidably engaged therewith. A second spring is connected between the second piston and the inner wall of the end of the cylinder body. A second communication pipe is connected and communicated between the end of the cylinder body and the first valve body. A blowing groove corresponding to the first communication pipe is formed and communicated between the first valve body and the second valve body.

[0015] Preferably, the blowing groove is opened towards the rubber sealing ring, and one end of the blowing groove is connected to the end of the first communication pipe.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: In the present invention, during the opening and closing processes of the valve plate, under the action of negative pressure, the second piston slides in the cylinder body and compresses the second spring by using the second communication pipe. In order to balance the air pressure in the cylinder body, the sliding of the second piston can draw external air into the cylinder body through the second one-way communicator. When it is necessary to stop the conveying, the negative pressure in the area on the side of the valve plate where no groove is formed gradually disappears. Then the second spring resets and pushes the second piston to slide. The second piston blows the gas in the cylinder body through the first connecting pipe, so that the blowing grooves arranged at equal angles all blow the high-hardness particles of fly ash that may exist between the outer rubber sealing ring of the valve plate to be closed and the first valve body towards the side of the valve plate where the groove is formed, thereby preventing the high-hardness particles in the fly ash from getting stuck between the rubber sealing ring and the first valve body; In the present invention, when the valve plate rotates and resets to close, the groove on the outer wall of the valve plate is facing the direction of the negative pressure suction force, and the rubber sealing ring in the annular groove on the outer wall of the valve plate fits the inner wall of the first valve body. By using the groove and the communication groove, negative pressure can be formed in the chamber, so that the first piston slides in the chamber and compresses the first spring. At the same time, the first piston pulls the rotating rod to rotate on the outer wall of the fixed rod through the sliding seat. The sliding columns at both ends of the rotating rod respectively slide and adjust in the sliding grooves of the sliding seat, so that the rotating rod pushes the connecting plate to move. The connecting plate drives the push column to push the inner wall of the rubber sealing ring. The moving stroke of the connecting plate is fixed, so that the moving stroke of the push column is fixed. At the same time, the side of the rubber sealing ring is fixed to the inner wall of the annular groove. When the push column pushes the inner wall of the rubber sealing ring, it can make the rubber sealing ring deform less, so that the outer wall of the rubber sealing ring fits the inner wall of the first valve body more closely. On the one hand, the sealing performance of the rubber sealing ring when the valve plate is closed can be improved. On the other hand, it can prevent compensation when the surface of the rubber sealing ring is slightly worn, so that the rubber sealing ring always closely fits the inner wall of the first valve body to ensure its sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the first perspective three-dimensional view of the present invention; Figure 2 is the second perspective three-dimensional view of the present invention; Figure 3For the present invention Figure 2 A magnified view of point A in the figure; Figure 4 A cutaway perspective view of the cleaning mechanism of the present invention; Figure 5 This is a first perspective perspective view of the first valve body of the present invention after being cut open; Figure 6 A second perspective view of the first valve body of the present invention after being cut open; Figure 7 For the present invention Figure 6 Enlarged view of point B in FIG. Figure 8 A perspective view of the valve plate of the present invention; Figure 9 is a sectional perspective view of the valve plate of the present invention; Figure 10 is a cross-sectional plan view of the valve plate of the present invention; Figure 11 For the present invention Figure 10 Enlarged view of point C in the figure.

[0018] In the figure: 1. first valve body; 2. second valve body; 3. servo motor; 4. rotating shaft; 5. valve plate; 6. rubber sealing ring; 7. groove; 8. connecting groove; 9. chamber; 10. first spring; 11. first piston; 12. connecting plate; 13. push column; 14. limiting column; 15. limiting groove; 16. fixing rod; 17. rotating rod; 18. sliding seat; 19. sliding column; 20. cylinder; 21. first one-way communicating vessel; 22. first connecting pipe; 23. second one-way communicating vessel; 24. second piston; 25. second spring; 26. second connecting pipe; 27. blowing groove. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0020] See also Figures 1 to 11, the present invention provides a technical solution: a T-valve for a negative pressure ash removal system of power plant fly ash, including a first valve body 1, a second valve body 2 fixed to the outer wall of the first valve body 1, a valve plate 5 disposed inside the first valve body 1, and a rubber sealing ring 6 disposed on the valve plate 5, characterized in that: it further includes a valve plate 5 disposed inside the first valve body 1 for controlling the opening or closing of the flow path inside the first valve body 1, a driving mechanism disposed on the first valve body 1 and the second valve body 2 for driving the valve plate 5 to rotate, a negative pressure pushing mechanism disposed inside the valve plate 5 for improving the sealing performance of the rubber sealing ring 6 and self-adaptively compensating when the valve plate 5 is closed, and a cleaning mechanism disposed outside the first valve body 1 for cleaning the outer surface of the rubber sealing ring 6 when the valve plate 5 is closed; An annular groove that fits with the rubber sealing ring 6 is provided on the outer surface of the valve plate 5.

[0021] The driving mechanism includes a servo motor 3 installed on the top of the second valve body 2. The output end of the servo motor 3 is connected to a rotating shaft 4 that penetrates into the first valve body 1, and the end of the rotating shaft 4 penetrates through the rubber sealing ring 6 and is fixed to the top of the valve plate 5.

[0022] It should be noted that after starting the servo motor 3, the servo motor 3 controls the valve plate 5 to rotate counterclockwise through the rotating shaft 4, and the rotation angle of the valve plate 5 is 90 degrees. After turning off the servo motor 3, the valve plate 5 rotates and resets along the original rotation path.

[0023] The rubber sealing ring 6 fits with the inner wall of the first valve body 1, and both sides of the rubber sealing ring 6 are fixed to the inner wall of the annular groove.

[0024] It should be noted that when the valve plate 5 is closed, the rubber sealing ring 6 forms a slight extrusion with the inner wall of the first valve body 1 to ensure a normal sealing effect. At the same time, when pushing the surface of the rubber sealing ring 6 on the inner wall of the annular groove, a small amount of deformation can occur on the outer wall of the rubber sealing ring 6 synchronously towards the inner wall of the first valve body 1.

[0025] The negative pressure pushing mechanism includes a groove 7 opened on one side outer wall of the valve plate 5. Communication grooves 8 are equally angularly opened on the inner wall of the groove 7. Chambers 9 corresponding to and communicating with the communication grooves 8 are equally angularly opened inside the valve plate 5. A first spring 10 is fixedly connected to the inner wall of the chamber 9 near the center of the valve plate 5. The end of the first spring 1 gives a first piston 11 that is slidably matched with the chamber 9, and a pushing assembly is provided between the first piston 11 and the rubber sealing ring 6.

[0026] It should be noted that the groove 7 is not penetrated through the outer wall of the valve plate 5. The groove 7 on the outer wall of the valve plate 5 faces the fly ash conveying direction, that is, the negative pressure suction direction. When the fly ash is conveyed through the first valve body 1, it is conveyed from the side of the valve plate 5 without the groove 7 to the side with the groove 7. The chamber 9 is of a cylindrical structure.

[0027] The driving assembly includes a connecting plate 12 disposed inside the chamber 9. A push column 13 is connected between the outer wall of the connecting plate 12 and the inner wall of the rubber sealing ring 6. A fixing rod 16 is fixed between the inner wall of the chamber 9 and the connecting plate 12 and located between the first piston 11. The outer wall of the fixing rod 16 is inclined and rotatably connected with a rotating rod 17. The outer walls of the first piston 11 and the connecting plate 12 are respectively provided with sliding seats 18 at both ends of the rotating rod 17. Sliding grooves are formed inside the sliding seats 18, and sliding columns 19 slidably engaged with the sliding grooves are respectively fixed to the outer walls of both ends of the rotating rod 17.

[0028] It should be noted that an activity groove for the movement of the push column 13 needs to be opened between the chamber 9 and the annular groove, and the aperture of the activity groove is larger than the size of the push column 13.

[0029] The outer wall of the connecting plate 12 is symmetrically provided with limit columns 14, and limit grooves 15 slidably engaged with the limit columns 14 are formed on the inner wall of the chamber 9.

[0030] It should be noted that the movement of the push column 13 can be limited by the sliding of the limit column 14 in the limit groove 15.

[0031] The cleaning mechanism includes cylinders 20 arranged at equal angles on the outer wall of the first valve body 1. A first one-way connector 21 is installed and communicated with one side outer wall of the cylinder 20. A first connecting pipe 22 is connected between the port of the first one-way connector 21 and the second valve body 2. A second one-way connector 23 is installed and communicated with the other side outer wall of the cylinder 20.

[0032] It should be noted that the flow direction of the first one-way connector 21 is only to output to the first connecting pipe 22, and the flow direction of the second one-way connector 23 is only to transport from the outside into the cylinder 20. Both the first one-way connector 21 and the second one-way connector 23 are conventional existing technologies.

[0033] The cleaning mechanism further includes a second piston 24 disposed inside the cylinder 20 and slidably engaged therewith. A second spring 25 is connected between the second piston 24 and the inner wall of the end of the cylinder 20. A second connecting pipe 26 is connected and communicated between the end of the cylinder 20 and the first valve body 1. A blowing groove 27 corresponding to the first connecting pipe 22 is formed and communicated between the first valve body 1 and the second valve body 2.

[0034] The blowing groove 27 is opened towards the rubber sealing ring 6, and one end of the blowing groove 27 is connected to the end of the first connecting pipe 22.

[0035] It should be noted that the blowing groove 27 is inclined relative to the fly ash conveying direction, which can prevent fly ash from entering the cylinder 20.

[0036] Working principle: First, the groove 7 on the outer wall of the valve plate 5 faces the fly ash conveying direction, that is, the negative pressure suction direction. When the fly ash is conveyed through the first valve body 1, it is conveyed from the side of the valve plate 5 without the groove 7 to the side with the groove 7. After starting the operation of the negative pressure ash removal system, the servo motor 3 is started. As Figure 5 shown, the servo motor 3 controls the valve plate 5 to rotate counterclockwise through the rotating shaft 4, and the rotation angle of the valve plate 5 is 90 degrees. After the valve plate 5 is opened, a negative pressure suction state is formed in the first valve body 1.

[0037] In the negative pressure suction state, the fly ash flows in the first valve body 1 and is conveyed into the negative pressure ash removal system. Under the negative pressure, the second piston 24 slides in the cylinder body 20 and compresses the second spring 25 by using the second connecting pipe 26. Since the flow direction of the first one-way connector 21 is only output to the first connecting pipe 22, and the blowing groove 27 is arranged obliquely relative to the fly ash conveying direction, it can prevent the fly ash from entering the cylinder body 20. And in order to balance the air pressure in the cylinder body 20, the sliding of the second piston 24 can draw external air into the cylinder body 20 through the second one-way connector 23. At this time, the flow direction of the second one-way connector 23 is only from the outside to the inside of the cylinder body 20.

[0038] When the conveying needs to be stopped, the rotating shaft 4 is controlled by the servo motor 3 to rotate and reset, so that the valve plate 5 rotates and resets. During the rotation and reset process, the negative pressure in the area on the side of the valve plate 5 without the groove 7 gradually disappears. Then the second spring 25 resets and pushes the second piston 24 to slide. The second piston 24 blows the gas in the cylinder body 20 out through the first connecting pipe 22, so that the equally angled blowing grooves 27 all face the possible fly ash high-hardness particles between the outer rubber seal ring 6 of the valve plate 5 about to close and the first valve body 1 and blow them to the side of the valve plate 5 with the groove 7, thus avoiding the high-hardness particles in the fly ash from getting stuck between the rubber seal ring 6 and the first valve body 1.

[0039] Finally, when the valve plate 5 rotates and resets to close, the groove 7 on the outer wall of the valve plate 5 faces the direction of the negative pressure suction force, and the rubber sealing ring 6 in the annular groove on the outer wall of the valve plate 5 fits against the inner wall of the first valve body 1. The negative pressure can be formed in the chamber 9 by using the groove 7 and the communication groove 8, so that the first piston 11 slides in the chamber 9 and compresses the first spring 10. At the same time, the first piston 11 pulls the rotating rod 17 to rotate on the outer wall of the fixed rod 16 through the sliding seat 18. The sliding columns 19 at both ends of the rotating rod 17 slide and adjust in the sliding grooves of the sliding seat 18 respectively, so that the rotating rod 17 pushes the connecting plate 12 to move. The connecting plate 12 drives the push column 13 to push the inner wall of the rubber sealing ring 6. The moving stroke of the connecting plate 12 is fixed, so that the moving stroke of the push column 13 is fixed. At the same time, the side of the rubber sealing ring 6 is fixed to the inner wall of the annular groove, so that when the push column 13 pushes the inner wall of the rubber sealing ring 6, it can cause less deformation of the rubber sealing ring 6, making the outer wall of the rubber sealing ring 6 fit more closely to the inner wall of the first valve body 1 adaptively. On the one hand, it can improve the sealing performance of the rubber sealing ring 6 when the valve plate 5 closes. On the other hand, it can prevent compensation when there is slight wear on the surface of the rubber sealing ring 6, so that the rubber sealing ring 6 always fits tightly against the inner wall of the first valve body 1 to ensure its sealing performance. Then, the negative pressure of the negative pressure ash removal system is closed, so that the area on the side of the valve plate 5 where the groove 7 is opened maintains a negative pressure.

[0040] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A T-shaped valve for a negative-pressure ash removal system of power plant fly ash, comprising a first valve body (1), a second valve body (2) fixed to the outer wall of the first valve body (1), a valve plate (5) disposed inside the first valve body (1), and a rubber sealing ring (6) disposed on the valve plate (5), characterized in that: It further includes a valve plate (5) disposed inside the first valve body (1) for controlling the opening or closing of the flow path inside the first valve body (1), a driving mechanism disposed on the first valve body (1) and the second valve body (2) for driving the valve plate (5) to rotate, a negative pressure pushing mechanism disposed inside the valve plate (5) for improving the sealing performance of the rubber sealing ring (6) and adaptively compensating when the valve plate (5) is closed, and a cleaning mechanism disposed outside the first valve body (1) for cleaning the outer surface of the rubber sealing ring (6) when the valve plate (5) is closed; An annular groove adapted to the rubber sealing ring (6) is provided on the outer surface of the valve plate (5).

2. The T-valve of a negative-pressure ash removal system for power plant fly ash according to claim 1, characterized in that: The driving mechanism includes a servo motor (3) installed on the top of the second valve body (2). The output end of the servo motor (3) is connected to a rotating shaft (4) that penetrates into the first valve body (1) internally, and the end of the rotating shaft (4) penetrates through the rubber sealing ring (6) and is fixed to the top of the valve plate (5).

3. The T-valve of a negative pressure ash removal system for power plant fly ash according to claim 1, characterized in that: The rubber sealing ring (6) is in contact with the inner wall of the first valve body (1), and both sides of the rubber sealing ring (6) are fixed to the inner wall of the annular groove.

4. The T-valve of a negative pressure ash removal system for power plant fly ash according to claim 1, characterized in that: The negative pressure pushing mechanism includes a groove (7) opened on the outer wall of one side of the valve plate (5). Communication grooves (8) are equiangularly opened on the inner wall of the groove (7). Chambers (9) corresponding to and communicating with the communication grooves (8) are equiangularly opened inside the valve plate (5). A first spring (10) is fixedly connected to the inner wall of the chamber (9) near the center of the valve plate (5). A first piston (11) slidably engaged with the chamber (9) is fixed to the end of the first spring (10). A pushing component is provided between the first piston (11) and the rubber sealing ring (6).

5. The T-valve of a negative-pressure ash removal system for power plant fly ash according to claim 4, characterized in that: The pushing component includes a connecting plate (12) disposed inside the chamber (9). A push column (13) is connected between the outer wall of the connecting plate (12) and the inner wall of the rubber sealing ring (6). A fixed rod (16) is fixedly connected to the inner wall of the chamber (9) between the first piston (11) and the connecting plate (12). A rotating rod (17) is obliquely rotatably connected to the outer wall of the fixed rod (16). Sliding seats (18) located at both ends of the rotating rod (17) are respectively provided on the outer walls of the first piston (11) and the connecting plate (12). Chute grooves are opened inside the sliding seats (18), and sliding columns (19) slidably engaged with the chute grooves are respectively fixed to the outer walls of both ends of the rotating rod (17).

6. The T-valve of a negative pressure ash removal system for power plant fly ash according to claim 5, characterized in that: Limiting columns (14) are symmetrically provided on the outer wall of the connecting plate (12), and limiting grooves (15) slidably engaged with the limiting columns (14) are opened on the inner wall of the chamber (9).

7. The T-valve of a negative pressure ash removal system for power plant fly ash according to claim 1, characterized in that: The cleaning mechanism includes cylinders (20) equiangularly provided on the outer wall of the first valve body (1). A first one-way communicator (21) is installed and communicated on one side outer wall of the cylinder (20). A first communication pipe (22) is connected between the port of the first one-way communicator (21) and the second valve body (2). A second one-way communicator (23) is installed and communicated on the other side outer wall of the cylinder (20).

8. The T-valve of a negative pressure ash removal system for power plant fly ash according to claim 7, characterized in that: The cleaning mechanism further includes a second piston (24) disposed inside the cylinder body (20) and slidably engaged therewith. A second spring (25) is connected between the second piston (24) and the inner wall of the end of the cylinder body (20). A second communication pipe (26) is connected and communicated between the end of the cylinder body (20) and the first valve body (1). A blowing groove (27) corresponding to the first communication pipe (22) is formed and communicated between the first valve body (1) and the second valve body (2).

9. The T-valve of a negative pressure ash removal system for power plant fly ash according to claim 8, characterized in that: The blowing groove (27) is opened towards the rubber sealing ring (6), and one end of the blowing groove (27) is connected to the end of the first communication pipe (22).

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