Airtight type lift valve

Abstract

The utility model discloses an airtight type lift valve which comprises a valve seat, a valve plate and a valve shaft, the valve plate is arranged on the valve shaft, the valve shaft is connected with the output end of an air cylinder, a front shaft supporting assembly is further arranged on the valve shaft, and the valve plate is located between the valve seat and the front shaft supporting assembly. An air seal and a brush seal adopted by the valve seat and the front shaft supporting assembly are combined to form a double-seal structure, the valve seat is arranged at the end, away from the air cylinder, of the valve shaft, the air cylinder is arranged on an air cylinder bracket, and an air cylinder cover is arranged on the air cylinder bracket to protect the air cylinder. And a cylinder bracket support is arranged on the cylinder bracket to guarantee stable operation of the cylinder.

Description

Technical Field

[0001] The utility model belongs to the technical field of waste gas treatment, and particularly relates to an airtight lifting valve. Background Technique

[0002] Volatile organic compounds (VOCs) mainly come from industries such as petrochemical, fine chemical, surface coating, and packaging printing. Most organic waste gases are toxic and harmful, which can directly cause harm to human health. Industrial emissions of organic waste gases are one of the main pollution sources in cities. VOCs emissions are an important reason for the formation of regional compound air pollution characteristics in China. The regenerative thermal oxidizer (RTO) is a device that burns and purifies industrial organic waste gases, uses a regenerator to exchange heat and cool the purified exhaust gas, and then exchanges heat and warms up the waste gas to be treated. Its core component is the lifting valve. Due to the large number of lifting valves in each RTO system and frequent switching, and they work in a high-temperature and corrosive environment for a long time, the valve shaft support components are often damaged, resulting in the valve not being able to open and close properly, causing the RTO to stop or the emission index to exceed the standard.

[0003] In view of the above factors, an airtight lifting valve is provided to avoid damage to the valve shaft support of the lifting valve, ensure the stable operation of the RTO, and improve the purification efficiency of the RTO. Content of the Utility Model

[0004] The purpose of the utility model is to provide an airtight lifting valve to solve the problems raised in the above background technique.

[0005] The purpose of the utility model is realized by the following technical solution: an airtight lifting valve, including a valve seat, a valve plate, and a valve shaft. The valve plate is arranged on the valve shaft, the valve shaft is connected to the output end of a cylinder, and a front shaft support assembly is also arranged on the valve shaft. The valve plate is located between the valve seat and the front shaft support assembly, and the air seal and brush seal used between the valve seat and the front shaft support assembly form a double-sealing structure;

[0006] A valve seat is arranged at one end of the valve shaft away from the cylinder. The cylinder is arranged on a cylinder bracket, and a cylinder cover is provided on the cylinder bracket to protect the cylinder, and a cylinder bracket support is arranged on the cylinder bracket to ensure the stable operation of the cylinder.

[0007] Further, the valve seat includes a valve seat air seal ring pipe and a plurality of valve seat air seal branch pipes. A valve seat air seal main pipe is arranged on the valve seat. The valve seat air seal main pipe distributes compressed gas to the upper interface and lower interface of the valve seat air seal. The compressed gas enters the valve seat air seal ring pipe and is evenly distributed to the periphery of the valve seat through a plurality of valve seat air seal branch pipes to form an air seal area.

[0008] Further, the front axle support assembly includes a valve mounting plate, a shaft seal, a shaft seal gland, a front axle idler wheel group, and a sealing box. A valve shaft air seal interface is provided on the shaft seal, and a shaft seal gland is arranged on one side of the shaft seal.

[0009] Further, a valve seat idler wheel group is arranged on the valve seat, and a sealing box is provided on the valve seat idler wheel group.

[0010] Further, a front axle idler wheel group is arranged on the valve mounting plate on the side away from the shaft seal gland. The front axle idler wheel group and the valve seat idler wheel group jointly support the valve plate and the valve shaft.

[0011] Further, a valve seat air seal inlet is provided on the valve mounting plate. The valve seat air seal inlet is connected to an air seal gas source pipe, and the other end of the air seal gas source pipe is connected to the valve seat. Compressed gas from the valve seat air seal ring pipe and several valve seat air seal branch pipes on the valve seat enters the air seal gas source pipe through the valve seat air seal inlet provided on the valve mounting plate, and is then respectively conveyed to the valve seat air seal main pipe and the sealing box on the valve seat idler wheel group.

[0012] Further, the sealing box is composed of a stainless steel box and a detachable brush type seal. Brush filaments are provided at the center of the detachable brush type seal.

[0013] Further, the brush filaments are made of wear-resistant and corrosion-resistant metal filaments.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0015] The present utility model combines air seal and brush type seal to form a double seal, protecting the idler wheel group from corrosion by waste gas, high-temperature flue gas, and dust, reducing the wear of the valve shaft and the idler wheel group, improving the working environment of the valve plate and the valve seat, and the valve shaft and the idler wheel group, greatly improving the use stability of the lifting valve and the purification efficiency of the RTO.

[0016] An air seal interface is provided on the shaft seal of the front axle support assembly of the present utility model, and a sealing box is provided on the front axle idler wheel group of the front axle support assembly. Clean gas with a certain pressure inside, such as compressed air, enters the shaft seal from the air seal interface and then enters the sealing box, forming a positive pressure isolation of sufficient length in the shaft seal and the sealing box to form a valve shaft air seal, which can not only prevent waste gas from escaping along the valve shaft and polluting the external environment, but also protect the front axle idler wheel group from corrosion by waste gas.

[0017] The valve seat of the present utility model is provided with a valve seat air seal ring pipe. Through several valve seat air seal branch pipes, compressed air is evenly distributed around the valve seat. When the valve plate is closed, a valve seat air seal is formed to prevent waste gas from leaking through the valve plate and affecting the purification efficiency. The valve seat idler wheel group is provided with a sealing box, and compressed air is introduced into the sealing box to form positive pressure protection to prevent the valve seat idler wheel group from being corroded by waste gas.

[0018] The sealed box of the utility model is provided with a detachable brush-type seal. Adopting a brush-type seal structure, which belongs to flexible sealing, it can adapt to manufacturing errors and thermal deformation, improve the sealing effect, and avoid the wear of the supporting roller group caused by dust on the valve shaft. It is convenient to install and has a long service life. The brush filaments of the brush-type seal play the role of countless small springs, effectively avoiding the problem of increased sealing clearance after the long-term and frequent use of the valve shaft, and reducing leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of the air-sealed lifting valve of the utility model;

[0020] Figure 2 is a schematic diagram of the valve seat of the utility model;

[0021] Figure 3 is a schematic diagram of the front shaft support assembly of the utility model

[0022] Figure 4 is a schematic diagram of the sealed box of the utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] Next, the technical solutions in the embodiments of the utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the utility model.

[0024] In the description of the utility model, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the utility model can be understood according to specific situations.

[0025] In the description of the utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the utility model.

[0026] Such as Figures 1-4As shown in the figure, a gas-sealed lift valve includes a valve seat 1, a valve plate 2, and a valve shaft 3. The valve plate 2 is arranged on the valve shaft 3. The valve shaft 3 is connected to the output end of a cylinder 5. A front shaft support assembly 4 is also arranged on the valve shaft 3. The valve plate 2 is located between the valve seat 1 and the front shaft support assembly 4. A gas seal and a brush seal combination are adopted between the valve seat 1 and the front shaft support assembly 4 to form a double-sealing structure.

[0027] A valve seat 1 is arranged at one end of the valve shaft 3 away from the cylinder 5. The cylinder 5 is arranged on a cylinder bracket 7, and a cylinder cover 6 is arranged on the cylinder bracket 7 to protect the cylinder 5. A cylinder bracket support 8 is arranged on the cylinder bracket 7 to ensure the stable operation of the cylinder 5.

[0028] In a preferred technical solution of the present utility model, the valve seat 1 includes a valve seat gas seal ring pipe 11 and a plurality of valve seat gas seal branch pipes 12. A valve seat gas seal main pipe 95 is arranged on the valve seat 1. The valve seat gas seal main pipe 95 distributes compressed gas to a valve seat gas seal upper interface 93 and a valve seat gas seal lower interface 94. The compressed gas enters the valve seat gas seal ring pipe 11 and is evenly distributed to the periphery of the valve seat 1 through the plurality of valve seat gas seal branch pipes 12 to form a gas seal area.

[0029] The front shaft support assembly 4 includes a valve mounting plate 41, a shaft seal 42, a shaft seal gland 43, a front shaft idler wheel group 44, and a seal box 45. A valve shaft gas seal interface 91 is arranged on the shaft seal 42, and a shaft seal gland 43 is arranged on one side of the shaft seal 42.

[0030] In a preferred technical solution of the present utility model, a valve seat idler wheel group 13 is arranged on the valve seat 1, and a seal box 45 is arranged on the valve seat idler wheel group 13.

[0031] In a preferred technical solution of the present utility model, a front shaft idler wheel group 44 is arranged on the valve mounting plate 41 on the side away from the shaft seal gland 43. The front shaft idler wheel group 44 and the valve seat idler wheel group 13 jointly support the valve plate 2 and the valve shaft 3.

[0032] In a preferred technical solution of the present utility model, a valve seat gas seal inlet 92 is arranged on the valve mounting plate 41. The valve seat gas seal inlet 92 is connected to a gas seal gas source pipe 9, and the other end of the gas seal gas source pipe 9 is connected to the valve seat 1.

[0033] The compressed gas in the valve seat gas seal ring pipe 11 and the plurality of valve seat gas seal branch pipes 12 on the valve seat 1 enters the gas seal gas source pipe 9 through the valve seat gas seal inlet 92 arranged on the valve mounting plate 41, and is then respectively transported into the valve seat gas seal main pipe 95 and the seal box 45 on the valve seat idler wheel group 13.

[0034] In a preferred technical solution of the present utility model, the sealing box 45 is composed of a stainless steel box 451 and a detachable brush-type seal 452, and a brush wire 453 is provided at the center of the detachable brush-type seal 452.

[0035] In a preferred technical solution of the present utility model, the brush wire 453 is made of wear-resistant and corrosion-resistant metal filaments.

[0036] In the present utility model, the cylinder 5 is placed on the cylinder bracket 7, and a cylinder cover 6 is provided to protect the cylinder. The cylinder bracket support 8 is used to ensure the stable operation of the cylinder. Through the air seal gas source pipe 9, clean compressed gas is distributed to each air seal point. The clean compressed gas can be nitrogen, compressed air, treated waste gas and other gases with pressure and no harmful components.

[0037] As Figure 2 shown, the air seal structure of the valve seat is composed of a valve seat air seal ring pipe 11 and several valve seat air seal branch pipes 12. The valve seat air seal main pipe 95 distributes compressed gas to the valve seat air seal upper interface 93 and the valve seat air seal lower interface 94, enters the valve seat air seal ring pipe 11, and then through several valve seat air seal branch pipes 12, is evenly distributed around the valve seat to form an air seal area, isolating the waste gas between the valve plate and the valve seat sealing surface and preventing waste gas leakage. The valve seat idler wheel group 13 adopts a bolt-adjustable structure and is adjusted after the valve is installed to make the concentricity between the valve shaft and the valve seat and the levelness of the cylinder meet the requirements.

[0038] As Figure 3 shown, it is a schematic diagram of the front axle support assembly. The front axle support assembly 4 includes a valve mounting plate 41, a shaft seal 42, a shaft seal gland 43, a front axle idler wheel group 44, and a sealing box 45. A valve shaft air seal interface 91 is provided on the shaft seal 42. Compressed gas enters the inside of the shaft seal from the valve shaft air seal interface and then enters the sealing box to form an air seal for the valve shaft. The front axle idler wheel group 44 and the valve seat idler wheel group 13 jointly support the valve shaft 3 and the valve plate 2. The compressed gas of the valve seat air seal enters the air seal gas source pipe 9 through the valve seat air seal inlet 92 provided on the valve mounting plate 41, and is then respectively transported to the valve seat air seal main pipe 95 and the air seal box on the valve seat idler wheel group 13.

[0039] As Figure 4 shown, the sealing box 45 is composed of a stainless steel box 451 and a detachable brush-type seal 452. A brush wire 453 is provided at the center of the detachable brush-type seal 452. After long-term use and wear failure, the detachable brush-type seal 452 can be replaced.

[0040] The brush filaments 453 are made of wear-resistant and anti-corrosive metal filaments. The brush seal structure belongs to a flexible seal, which can adapt to manufacturing errors and thermal deformation, improve the sealing effect, and avoid the wear of the supporting wheel group caused by dust on the valve shaft. The advantages of the brush seal are mainly reflected in the working conditions of dynamic seals. The contact surface between the brush seal and the valve shaft is composed of many fine metal wires. At the same time, these brush filaments have a certain inclination angle with the valve shaft, so that these brush filaments play the role of countless small springs, effectively avoiding the problem of increased sealing clearance after long-term and frequent use of the valve shaft, and reducing the leakage rate. Compressed gas can cool the supporting wheel group and the brush seal.

[0041] The utility model combines a gas seal and a brush seal to form a double seal, which protects the supporting wheel group from being corroded by waste gas, high-temperature flue gas and dust, reduces the wear of the valve shaft and the supporting wheel group, improves the working environment of the valve plate and the valve seat, and the valve shaft and the supporting wheel group, and greatly improves the use stability of the lifting valve and the purification efficiency of the RTO.

[0042] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0043] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A gas-sealed lift valve, characterized in that: It includes a valve seat (1), a valve plate (2), and a valve shaft (3). The valve plate (2) is arranged on the valve shaft (3), and the valve shaft (3) is connected to the output end of a cylinder (5). A front shaft support assembly (4) is also arranged on the valve shaft (3). The valve plate (2) is located between the valve seat (1) and the front shaft support assembly (4). The air seal and brush seal combination used in the valve seat (1) and the front shaft support assembly (4) form a double-sealing structure. A valve seat (1) is arranged at one end of the valve shaft (3) away from the cylinder (5). The cylinder (5) is arranged on a cylinder bracket (7), and a cylinder cover (6) is provided on the cylinder bracket (7) to protect the cylinder (5). A cylinder bracket support (8) is arranged on the cylinder bracket (7) to ensure the stable operation of the cylinder (5).

2. The airtight lift valve according to claim 1, wherein: The valve seat (1) includes a valve seat air seal ring pipe (11) and a plurality of valve seat air seal branch pipes (12). A valve seat air seal main pipe (95) is arranged on the valve seat (1). The valve seat air seal main pipe (95) distributes compressed gas to a valve seat air seal upper interface (93) and a valve seat air seal lower interface (94). The compressed gas enters the valve seat air seal ring pipe (11) and is evenly distributed around the valve seat (1) through the plurality of valve seat air seal branch pipes (12) to form an air seal area.

3. The airtight lifting valve according to claim 2, characterized in that: The front shaft support assembly (4) includes a valve mounting plate (41), a shaft seal (42), a shaft seal gland (43), a front shaft idler wheel group (44), and a seal box (45). A valve shaft air seal interface (91) is provided on the shaft seal (42), and a shaft seal gland (43) is arranged on one side of the shaft seal (42).

4. The airtight lifting valve according to claim 3, characterized in that: A valve seat idler wheel group (13) is arranged on the valve seat (1), and a seal box (45) is provided on the valve seat idler wheel group (13).

5. The gas-sealed lift valve according to claim 4, characterized in that: A front shaft idler wheel group (44) is arranged on the valve mounting plate (41) on the side away from the shaft seal gland (43). The front shaft idler wheel group (44) and the valve seat idler wheel group (13) jointly support the valve plate (2) and the valve shaft (3).

6. The airtight lift valve according to claim 5, characterized in that: A valve seat air seal inlet (92) is arranged on the valve mounting plate (41). The valve seat air seal inlet (92) is connected to an air seal gas source pipe (9), and the other end of the air seal gas source pipe (9) is connected to the valve seat (1). The compressed gas in the valve seat air seal ring pipe (11) and the plurality of valve seat air seal branch pipes (12) on the valve seat (1) enters the air seal gas source pipe (9) through the valve seat air seal inlet (92) arranged on the valve mounting plate (41), and is then respectively transported into the valve seat air seal main pipe (95) and the seal box (45) on the valve seat idler wheel group (13).

7. The airtight lift valve according to claim 6, characterized in that: The seal box (45) is composed of a stainless steel box (451) and a detachable brush seal (452). A brush wire (453) is arranged at the center of the detachable brush seal (452).

8. The airtight lift valve according to claim 7, characterized in that: The brush wire (453) is made of wear-resistant and corrosion-resistant metal filaments.

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