Gas sealing type lifting valve

Abstract

The utility model discloses a gas sealing type lift valve which comprises a valve seat, a cylinder seat, a connecting rod and a ball head main shaft, and a cylinder installed in the cylinder seat is connected with the ball head main shaft. The ball head main shaft is provided with a ball head which is used for being installed in a ball head seat, and the ball head seat is installed on the valve plate; the ball head main shaft is located in a space formed by the connecting rod and the valve seat, and the valve seat is arranged below the valve plate; a surrounding protruding part and a surrounding first labyrinth component corresponding to the protruding part are arranged on the outer edge side of the valve seat. In order to overcome the defects of a metal contact sealing lift valve, labyrinth type high-pressure air sealing of the valve plate and the valve seat is adopted, the sealing structure enables compressed air to enter from the center of a labyrinth and to be slowly sprayed out from the edge of the labyrinth, and three high-pressure air rings are formed on each of the two sides in the labyrinth, so that industrial waste gas cannot pass through the labyrinth gas sealing rings; and therefore, waste gas leakage and the like occur.

Description

Technical Field

[0001] This utility model relates to a lifting valve, and more particularly to a gas-tight lifting valve. Background Technology

[0002] Regenerative Thermal Oxidizer (RTO) is a type of thermal incinerator that is also known as a regenerative thermal oxidizer. It is mainly used for waste gas treatment and requires the use of a lift valve.

[0003] The existing lift valve consists of a cylinder, cylinder seat, shaft seat, connecting rod, and valve seat from top to bottom, with an internal main shaft and valve plate assembly. Used in high and low temperature industrial waste gas treatment, its working principle is that a solenoid valve switches the position of the compressed air inlet and outlet to control the direction of cylinder movement. When the cylinder moves downwards, the cylinder rod, in conjunction with the main shaft, moves the valve plate assembly downwards, causing the sealing valve plate to press against the valve seat. Because the sealing valve plate is relatively soft and elastic, when it presses against the harder, less elastic valve seat, the sealing valve plate undergoes elastic deformation under the thrust of the cylinder. During this deformation, the gap between the valve plate and the valve seat is filled, achieving a sealing function, preventing industrial waste gas from passing through the valve seat. When the solenoid valve switches the position of the compressed air inlet and outlet, causing the cylinder to move upwards, the cylinder rod, in conjunction with the main shaft, moves the valve plate assembly upwards. The valve plate assembly leaves the valve seat, and the sealing valve plate, due to the disappearance of the pressure applied by the cylinder, loses its elastic deformation and returns to its original shape, allowing industrial waste gas to pass through the valve seat.

[0004] In existing technologies, lift valves use metal-to-metal contact sealing, which suffers from decreased sealing performance as the valve seat diameter increases. The main reason for this performance degradation is that during manufacturing, increased component dimensions and decreased machining precision lead to a decrease in sealing performance. Lift valves achieve sealing by using the elastic deformation of the sealing disc to fill the gap between the disc and the valve seat. However, as the valve seat size increases and its surface flatness decreases, the gap between the disc and seat exceeds the elastic deformation, resulting in decreased or failed metal-to-metal sealing performance. Therefore, lift valves using metal-to-metal contact sealing are only suitable for smaller industrial waste gas treatment applications. Furthermore, while the sealing method relies on the elastic deformation of the sealing disc to fill the gap, the high and low temperature environments and continuous year-round operation of lift valves mean that, without proper maintenance, the sealing disc can still undergo plastic deformation (permanent deformation) and wear at the contact point between the disc and the seat. These factors all contribute to decreased or failed metal-to-metal sealing performance. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to provide a gas-tight lifting valve, which solves the problems of existing lifting valves having reduced sealing performance or failure as the valve seat diameter increases, and being only applicable to small-diameter lifting valves, but unable to handle the large-scale industrial waste gas treatment field of large-diameter lifting valves. In particular, it avoids the situation where the metal contact sealing method will experience reduced sealing performance or failure due to mechanical wear in complex high and low temperature working environments and continuous operation throughout the year.

[0006] The technical problem to be solved by this utility model is achieved by the following technical solution:

[0007] This utility model provides a gas-tight lifting valve, including a valve seat, a cylinder seat, a connecting rod, and a ball-head spindle, wherein...

[0008] The cylinder installed in the cylinder seat is connected to the ball head spindle;

[0009] The ball head spindle has a ball head for mounting within a ball head seat, wherein...

[0010] The ball head seat is mounted on the valve plate;

[0011] The ball head spindle is located within the space formed by the connecting rod and the valve seat, wherein,

[0012] The valve seat is located below the valve plate;

[0013] The valve seat has a surrounding protrusion on its outer edge, and a corresponding surrounding first labyrinth component, wherein...

[0014] Both the protrusion and the end of the first labyrinth component have a plurality of first protrusions, and a first recess is formed between adjacent first protrusions.

[0015] In a preferred embodiment of this invention, a first gap is formed between the protrusion and the first labyrinth component.

[0016] The first gap has an opening at one end, forming a second gap;

[0017] The first maze component is also equipped with a second maze component arranged around it, wherein,

[0018] Both the second maze component and the first maze component have through holes that are interconnected.

[0019] In a preferred embodiment of this invention, the valve plate has a plurality of second protrusions at its bottom, and a second recess is formed between adjacent second protrusions.

[0020] The second protrusion of the valve plate corresponds to the first recess, and the second recess corresponds to the first protrusion.

[0021] In a preferred embodiment of this invention, the cross-section of the second gap is smaller than that of the first gap.

[0022] In a preferred embodiment of this utility model, the valve plate is provided with the ball head seat, wherein...

[0023] The ball head seat is provided with a ball head cover, and the ball head seat and the ball head cover are connected by a ball head seat connector.

[0024] As a preferred embodiment of this utility model, the top of the outer housing connected by the connecting rod is provided with packing and a packing gland, wherein...

[0025] The ball head spindle passes through the packing and the packing gland.

[0026] As a preferred embodiment of this invention, a solenoid valve and a proximity switch are installed on the side of the cylinder seat.

[0027] As a preferred embodiment of this utility model, a screw is installed at the end of the connecting rod.

[0028] The beneficial effects of this utility model are as follows: Addressing the shortcomings of metal-contact sealed lift valves, this utility model employs a labyrinth-type high-pressure air seal between the valve plate and valve seat. This sealing structure allows compressed air to enter from the center of the labyrinth and slowly exit from the edges, forming three high-pressure air rings on each side within the labyrinth. This prevents industrial waste gas from passing through the labyrinth gas sealing rings, thus avoiding waste gas leakage. It also avoids the influence of machining precision, allowing the gas-sealed lift valve to be used in larger industrial waste gas treatment applications. Furthermore, the labyrinth airtight structure of the gas-sealed lift valve eliminates mechanical wear caused by valve plate deformation during operation, preventing failure due to lack of maintenance in complex high and low temperature working environments and continuous year-round operation. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of this utility model;

[0030] Figure 2 This is one of the partial structural schematic diagrams of this utility model;

[0031] Figure 3 This is a second partial structural schematic diagram of the present invention;

[0032] Figure 4 This is the third partial structural schematic diagram of the present invention;

[0033] Figure 5 This is the fourth partial structural schematic diagram of the present invention;

[0034] In the diagram: 1. Valve seat; 100. Protrusion; 101. First protrusion; 102. Second protrusion; 103. First labyrinth component; 104. First gap; 1041. Second gap; 105. Second labyrinth component; 1051. Through hole; 2. Valve plate; 201. Second protrusion; 202. Second recess; 3. Ball head seat; 4. Ball head gland; 5. Ball head seat connector; 6. Ball head spindle; 7. Connecting rod; 8. Screw; 9. Packing; 10. Packing gland; 11. Airtight interface; 12. Solenoid valve; 13. Cylinder seat; 14. Proximity switch; 15. Cylinder. Detailed Implementation

[0035] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0036] Example

[0037] like Figure 1-5 As shown, this embodiment provides a gas-tight lifting valve, including a valve seat 1, a cylinder seat 13, a connecting rod 7 and a ball head spindle 6, wherein a cylinder 15 installed in the cylinder seat 13 is connected to the ball head spindle 6;

[0038] The ball head spindle 6 has a ball head for mounting in the ball head seat 3, wherein the ball head seat 3 is mounted on the valve plate 2; the ball head spindle 6 is located in the space formed by the connecting rod 7 and the valve seat 1, wherein the valve seat 1 is located below the valve plate 2; specifically, the valve plate 2 is provided with the ball head seat 3, wherein the ball head seat 3 is provided with the ball head cover 4, and the ball head seat 3 and the ball head cover 4 are connected by the ball head seat connector 5.

[0039] The gas-tight lift valve consists of a frame, a pneumatic unit, and a sealing structure. The frame comprises a cylinder seat 13, a spindle seat, a connecting rod 7, and a valve seat 1; these components form the skeleton of the gas-tight lift valve, and other structural units operate within the frame. The pneumatic unit consists of a cylinder 15, a solenoid valve 12, a proximity switch 14, and a ball-head spindle 6; their interaction enables control power transmission and position feedback. The sealing structure consists of a ball-head seat 3 and a sealing valve plate 2; its downward movement and engagement with the valve seat achieve the gas-tight sealing function.

[0040] Valve seat 1 has a surrounding protrusion 100 on its outer edge and a corresponding surrounding first labyrinth component 103. Both the protrusion 100 and the first labyrinth component 103 have several first protrusions 101 at their ends, and a first recess 102 is formed between adjacent first protrusions 101. Valve plate 2 has several second protrusions 201 at its bottom, and a second recess 202 is formed between adjacent second protrusions 201. The second protrusions 201 of valve plate 2 correspond to the first recesses 102, and the second recesses 202 correspond to the first protrusions 101, thus forming a seal.

[0041] Specifically, regarding the maze structure, a first gap 104 is formed between the protrusion 100 and the first maze component 103, wherein one end of the first gap 104 has an opening, forming a second gap 1041;

[0042] A second maze component 105 is also installed around the first maze component 103. Both the second maze component 105 and the first maze component 103 have through holes 1051 and are interconnected. The cross-section of the second gap portion 1041 is smaller than the cross-section of the first gap portion 104.

[0043] The top of the outer casing, connected by the connecting rod 7, is equipped with packing 9 and a packing gland 10. The ball-head spindle 6 passes through the packing 9 and the packing gland 10. Regarding the packing 9, the packing gland 10, and the airtight interface 11, the ball-head spindle 6 needs to move, so a gap is required between it and the bushing. However, a large gap can lead to exhaust gas leakage. The packing acts as a sealing ring to fill the gap between the spindle and the bushing. The packing gland reduces the gap between the spindle and the bushing by compressing the packing. Compressed air is introduced into the bushing through the airtight interface, forming a high-pressure air ring inside the bushing to further prevent exhaust gas from leaking through the tiny gap in the packing.

[0044] A solenoid valve 12 and a proximity switch 14 are mounted on the side of the cylinder seat 13. A screw 8 is mounted on the end of the connecting rod 7.

[0045] Specifically, during operation, the solenoid valve switches the position of the compressed air inlet and outlet, controlling the cylinder 15 to move downwards. The cylinder rod, in conjunction with the ball head spindle 6, moves the sealing valve plate 2 downwards to press against the valve seat 1. The connection between the sealing valve plate 2 and the ball head spindle 6 adopts a flexible connection method (i.e., the ball head is installed inside the ball head seat 3). This method allows the sealing valve plate 2 to swing at a small angle, so that the small trapezoidal labyrinth structure valve plate 2 with guiding function and the large trapezoidal labyrinth structure valve seat 1 with guiding function fit perfectly. At this time, the compressed air entering from the side of the valve seat 1 is diverted through the gas buffer chamber inside the valve seat 1 and then evenly ejected from the center of the labyrinth (second gap 1041) of the valve seat 1. After multiple expansions and contractions within the labyrinth, the compressed air is slowly released from both sides of the contact surface between the valve plate 2 and the valve seat 1. The multiple expansions and contractions of the compressed air within the labyrinth form three high-pressure air rings on both the inner and outer sides to prevent exhaust gas from passing through. When the solenoid valve switches the position of the compressed air inlet and outlet to control the cylinder to move upward, the cylinder rod, in conjunction with the ball head spindle 6, moves the sealing valve plate 2 upward away from the valve seat. At this time, the compressed air in the valve seat 1 is shut off by the solenoid valve 12, allowing industrial waste gas to pass through and enter the equipment through the valve seat 1. The gas-tight lift valve is improved by changing the metal-to-metal contact seal between the valve plate and the valve seat to a labyrinth-type high-pressure air seal between the valve plate and the valve seat. The labyrinth airtight structure is not affected by machining precision, allowing the gas-tight lift valve to be used in large-scale industrial waste gas treatment. The labyrinth airtight structure does not experience mechanical wear due to valve plate deformation during operation, preventing the lift valve from failing due to lack of maintenance in complex high and low temperature working environments and continuous operation throughout the year.

[0046] This invention addresses the shortcomings of metal-contact sealed lift valves by employing a labyrinth-type high-pressure air seal between the valve plate and valve seat. This sealing structure allows compressed air to enter from the center of the labyrinth (second gap 1041) and slowly exit from the labyrinth edges, forming three high-pressure air rings on each side within the labyrinth. This prevents industrial waste gas from passing through the labyrinth gas sealing rings, thus avoiding waste gas leakage. It also avoids the influence of machining precision, allowing the gas-sealed lift valve to be used in large-scale industrial waste gas treatment applications. Furthermore, the labyrinth airtight structure of the gas-sealed lift valve eliminates the mechanical wear caused by valve plate deformation during operation, preventing failure due to lack of maintenance in complex high and low temperature working environments and continuous year-round operation.

[0047] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments, and various changes and modifications can be made without departing from the spirit and scope of this utility model. All such changes and modifications fall within the scope of protection claimed by this utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A gas-tight lifting valve, characterized in that, Includes valve seat (1), cylinder seat (13), connecting rod (7), and ball head spindle (6), wherein, The cylinder (15) installed in the cylinder seat (13) is connected to the ball head spindle (6); The ball head spindle (6) has a ball head for mounting in the ball head seat (3), wherein, The ball head seat (3) is installed on the valve plate (2); The ball head spindle (6) is located within the space formed by the connecting rod (7) and the valve seat (1), wherein, The valve seat (1) is disposed below the valve plate (2); The valve seat (1) has a surrounding protrusion (100) on its outer edge, and a corresponding surrounding first labyrinth component (103), wherein... Both the protrusion (100) and the first labyrinth component (103) have a plurality of first protrusions (101) at their ends, and a first recess (102) is formed between adjacent first protrusions (101).

2. The gas-tight lifting valve according to claim 1, characterized in that, A first gap (104) is formed between the protrusion (100) and the first labyrinth component (103), wherein, The first gap portion (104) has an opening at one end, forming a second gap portion (1041). The first maze component (103) is also equipped with a second maze component (105) arranged around it, wherein, Both the second maze component (105) and the first maze component (103) are provided with through holes (1051) and are interconnected.

3. A gas-tight lifting valve according to claim 2, characterized in that, The valve plate (2) has a plurality of second protrusions (201) at its bottom, and a second recess (202) is formed between adjacent second protrusions (201). The second protrusion (201) of the valve plate (2) corresponds to the first recess (102), and the second recess (202) corresponds to the first protrusion (101).

4. A gas-tight lifting valve according to claim 2, characterized in that, The cross-section of the second gap (1041) is smaller than the cross-section of the first gap (104).

5. A gas-tight lifting valve according to claim 1, characterized in that, The valve plate (2) is provided with the ball head seat (3), wherein... The ball head seat (3) is provided with a ball head cover (4), and the ball head seat (3) and the ball head cover (4) are connected by a ball head seat connector (5).

6. A gas-tight lift valve according to claim 1, characterized in that, The top of the outer housing connected by the connecting rod (7) is provided with packing (9) and a packing gland (10), wherein, The ball head spindle (6) passes through the packing (9) and the packing gland (10).

7. A gas-tight lifting valve according to claim 1, characterized in that, A solenoid valve (12) and a proximity switch (14) are installed on the side of the cylinder seat (13).

8. A gas-tight lift valve according to claim 1, characterized in that, The end of the connecting rod (7) is fitted with a screw (8).

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