Zero-waste-gas-leakage multipurpose horizontal push-pull valve structure

Abstract

The utility model discloses a zero-waste-gas-leakage multipurpose horizontal push-pull valve structure, and belongs to the technical field of waste gas treatment equipment. The push-pull valve comprises a push-pull valve sealing flange, a moving shaft and a valve plate, the push-pull valve sealing flange is arranged on the inner wall of the waste gas inlet / outlet pipeline, a sealing structure is arranged on the push-pull valve sealing flange, and the sealing structure comprises mechanical sealing structures on the two sides and a compressed gas sealing structure in the middle; the valve plate is arranged on the moving shaft and corresponds to the sealing structure; the moving shaft penetrates through the sealing flange of the push-pull valve and can linearly move to drive the valve plate to move, so that the valve plate is matched with the sealing structure, and sealing of the pipeline is achieved. According to the three-sealing-groove structure, the sealing strips are selected according to the temperature of waste gas, the middle groove is filled with compressed air, and pressure difference is formed between the inside and the outside, so that the sealing effect of the horizontal push-pull valve is effectively improved, and zero leakage of the waste gas is guaranteed; the sealing device is obvious in sealing effect, free of waste gas leakage, simple in structure, easy to disassemble and assemble, low in cost, long in service life and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of waste gas treatment equipment, and in particular relates to a multi-purpose horizontal push-pull valve structure with zero waste gas leakage. Background Art

[0002] The principle of a regenerative thermal oxidizer (RTO) is to heat organic waste gas to 800-850°C, oxidizing and decomposing the VOCs in the waste gas into carbon dioxide and water. The high-temperature gas generated by oxidation flows through a ceramic regenerator, causing it to heat up and store heat. The regenerator chamber in this state is used to preheat the organic waste gas that subsequently enters. The regenerator chamber is divided into two or more chambers, each of which undergoes a cycle of heat storage, heat release, and cleaning, repeating continuously.

[0003] In the aforementioned waste gas treatment process system, a non-standard valve is required to ensure the smooth switching of each heat storage chamber. The valve is installed in the pipeline, and the valve plate is placed in the inlet / outlet pipe. Under the push of the cylinder, the valve plate is smoothly opened or closed to complete the normal switching of the waste gas. The push-pull valve is mainly composed of the cylinder, shaft, cylinder bracket, valve plate, sealing strip, sealing groove and other main components. The cylinder provides power for the push-pull valve, pushing the shaft to move left and right, so that the valve plate is in the open or closed state; a magnetic switch is installed on the cylinder to detect whether the push-pull valve is in the open or closed state in the RTO waste gas treatment system PLC; compressed air is filled in the sealing groove to form a pressure difference between the inside and outside of the middle sealing groove, thereby ensuring zero waste gas leakage.

[0004] At present, in order to ensure the sealing of the RTO furnace horizontal push-pull valve in the project, soft seals (EPDM rubber) are usually used. However, when dealing with high-temperature (greater than 80°C) flue gas, the durability and sealing effect of the soft seal will be greatly reduced. During long-term operation, the sealing of the valve is difficult to guarantee. Utility Model Content

[0005] In response to the above-mentioned problems existing in the prior art, the purpose of the present invention is to provide a three-sealing groove structure, in which the sealing strip is selected according to the exhaust gas temperature, the middle groove is filled with compressed air, and a pressure difference is formed between the inside and the outside, thereby effectively improving the sealing effect of the horizontal push-pull valve and ensuring zero exhaust gas leakage; its sealing effect is obvious, there is zero exhaust gas leakage, and it has the advantages of simple structure, easy disassembly and assembly, low cost, and long service life.

[0006] The utility model provides the following technical solutions: a multi-purpose horizontal push-pull valve structure with zero exhaust gas leakage, which is arranged in the exhaust gas inlet / outlet pipe of the equipment to control the flow of exhaust gas in the pipe; it includes a push-pull valve sealing flange, a movable shaft and a valve plate; the push-pull valve sealing flange is arranged on the inner wall of the exhaust gas inlet / outlet pipe, and a sealing structure is arranged thereon, and the sealing structure includes a mechanical sealing structure located on both sides and a compressed gas sealing structure arranged between the mechanical sealing structures on both sides; the valve plate is arranged on the movable shaft, and is arranged corresponding to the sealing structure; the movable shaft is arranged through the push-pull valve sealing flange, and can move linearly, driving the valve plate to move, so that the valve plate cooperates with the sealing structure to achieve sealing of the pipe.

[0007] Furthermore, the mechanical sealing structure includes a mechanical sealing groove and a sealing strip arranged in the mechanical sealing groove; the compressed gas sealing structure includes a compressed gas sealing groove, and compressed gas is introduced into the compressed gas sealing groove.

[0008] Furthermore, the sealing strip is made of graphite packing or foamed silicone.

[0009] Furthermore, a group of vent holes connected to the compressed gas sealing groove are provided on the push-pull valve sealing flange, and the vent holes are connected to an external gas source.

[0010] Furthermore, the pressure P0 in the compressed gas sealing groove is greater than the pressure P2 of the exhaust gas in the pipeline, and the pressure P2 of the exhaust gas in the pipeline is greater than the pressure P1 inside the equipment.

[0011] Furthermore, it also includes a cylinder, the output end of the cylinder is connected to the moving shaft to control the linear movement of the moving shaft.

[0012] By adopting the above technology, compared with the existing technology, the beneficial effects of the present invention are as follows:

[0013] 1) In the present invention, the sealing structure adopts the design of mechanical sealing structure on both sides and compressed gas sealing structure in the middle. In combination with the valve plate, the pressure difference between the air pressure in the compressed gas sealing groove and the external air pressure in the compressed gas sealing structure is utilized to achieve gas sealing of the compressed gas sealing groove, ensuring zero exhaust gas leakage at the sealing part of the push-pull valve plate;

[0014] 2) In the present invention, the sealing strip in the mechanical seal structure adopts graphite packing or foamed silicone according to the different medium temperatures, which can extend the service life of the sealing strip while ensuring its elasticity and is suitable for different temperature conditions;

[0015] 3) The utility model has a simple overall structure, is easy to assemble and disassemble, and is convenient to maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1This is a schematic diagram of the internal structure of the push-pull valve in the closed state of the utility model;

[0017] Figure 2 This is a schematic structural diagram of the push-pull valve sealing device of the utility model;

[0018] Figure 3 This is a structural diagram of the sealing device when the push-pull valve of the utility model is in the closed state. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0020] Rather, the present invention encompasses any alternatives, modifications, equivalents, and solutions within the spirit and scope of the present invention as defined by the claims. Furthermore, to facilitate a better understanding of the present invention, certain specific details are detailed below in the detailed description of the present invention. Those skilled in the art will be able to fully understand the present invention without these details.

[0021] Example:

[0022] This embodiment takes the waste gas treatment of a regenerative thermal incinerator as an example:

[0023] See also Figure 1-3 A multi-purpose, zero-leakage horizontal push-pull valve structure is installed in the exhaust gas inlet and outlet pipes to control the flow of gas between the exhaust gas and the incinerator. The horizontal push-pull valve structure includes a push-pull valve sealing flange 1, a movable shaft 2, a valve plate 3, and a cylinder 4.

[0024] Specifically, the annular push-pull valve sealing flange 1 is fixed at the interface of the pipeline. The push-pull valve sealing flange 1 is provided with a sealing structure along the axial outer end face. The sealing structure includes mechanical sealing structures on both sides and a compressed gas sealing structure located between the mechanical sealing structures on both sides.

[0025] The mechanical seal structure includes a mechanical seal groove 101 and a sealing strip 103 disposed within the groove. The appropriate sealing strip material is selected based on the medium temperature. When the medium temperature is greater than 80°C, graphite packing is selected, while when the medium temperature is less than 80°C, foamed silicone is selected. This ensures the elasticity of the sealing strip 103 and extends its service life.

[0026] The compressed gas sealing structure includes a compressed gas sealing groove 102, and a plurality of vent holes 104 are evenly opened on the push-pull valve sealing flange 1. One side of the vent hole 104 is connected to the compressed gas sealing groove 102, and the other side is connected to the external gas source through a pipeline to provide compressed air for the compressed gas sealing groove 102; an electromagnetic switch valve is provided on the pipeline.

[0027] A gap is left between the sealing strip 103 and the mechanical sealing groove 101 to facilitate installation of the sealing strip.

[0028] The upper end surface of the groove wall of each sealing groove in the sealing structure is inclined inward. In this embodiment, the angle between the inclined surface and the horizontal plane is set to 4°.

[0029] Specifically, the movable shaft 2 is arranged to penetrate the axial direction of the push-pull valve sealing flange 1, and its outer end is connected to the output end of the cylinder 4 through a coupling. The cylinder 4 is fixed to the outside of the pipeline structure through a cylinder mounting seat 5.

[0030] Specifically, the valve plate 3 is fixed on the outer side of the movable shaft 2 perpendicular to the axial direction of the movable shaft 2. When the cylinder 4 is started, the movable shaft 2 is driven to move, and then the valve plate 3 arranged on the movable shaft 2 is driven to move, contacting the sealing structure to achieve sealing.

[0031] In this embodiment, the push-pull valve sealing flange 1 adopts a three-groove sealing structure. The sealing strip material of the inner and outer mechanical sealing grooves 101 is selected according to the exhaust gas temperature. The middle compressed gas sealing groove 102 is filled with compressed air. When the push-pull valve is closed, the compressed air solenoid valve is opened. Under the external force of the cylinder 4, the valve plate 3 is in close contact with the sealing strips 103 in the inner and outer mechanical sealing grooves 101, forming an air seal in the middle compressed gas sealing groove, ensuring zero exhaust gas leakage. The middle compressed gas sealing groove 102 is filled with compressed air (0.45-0.6MPa). The pressure inside the groove is P0, the internal pressure of the RTO furnace is P1, and the exhaust gas pressure in the pipeline is P2. P0>P2>P1. There is a pressure difference between the middle compressed gas sealing groove 102 and the outside, which can prevent the low-pressure exhaust gas from entering the outside, thereby achieving an air seal in the compressed air sealing groove and ensuring zero exhaust gas leakage at the seal of the push-pull valve plate.

[0032] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A zero exhaust gas leakage multi-purpose horizontal push-pull valve structure, characterized in that: The horizontal push-pull valve structure is arranged in the exhaust gas inlet / outlet pipe of the equipment to control the flow of the exhaust gas in the pipe; it comprises a push-pull valve sealing flange (1), a movable shaft (2) and a valve plate (3); the push-pull valve sealing flange (1) is arranged at the interface position of the exhaust gas inlet / outlet pipe, and a sealing structure is arranged thereon, and the sealing structure comprises a mechanical sealing structure located on both sides and a compressed gas sealing structure arranged between the mechanical sealing structures on both sides; the valve plate (3) is arranged on the movable shaft (2), and is arranged corresponding to the sealing structure; the movable shaft (2) is arranged through the push-pull valve sealing flange (1), and can move linearly, driving the valve plate (3) to move, so that the valve plate (3) cooperates with the sealing structure to achieve sealing of the pipe.

2. A zero exhaust gas leakage multi-purpose horizontal push-pull valve structure according to claim 1, characterized in that: The mechanical sealing structure comprises a mechanical sealing groove (101) and a sealing strip (103) arranged in the mechanical sealing groove (101); the compressed gas sealing structure comprises a compressed gas sealing groove (102), and compressed gas is introduced into the compressed gas sealing groove (102).

3. The zero exhaust gas leakage multi-purpose horizontal push-pull valve structure according to claim 2 is characterized in that: The sealing strip is made of graphite packing or foamed silica gel.

4. The zero exhaust gas leakage multi-purpose horizontal push-pull valve structure according to claim 2 is characterized in that: The push-pull valve sealing flange (1) is provided with a group of vent holes (104) in communication with the compressed gas sealing groove (102), and the vent holes (104) are in communication with an external gas source.

5. The zero exhaust gas leakage multi-purpose horizontal push-pull valve structure according to claim 4 is characterized in that: The pressure P0 in the compressed gas sealing groove (102) is greater than the pressure P2 of the exhaust gas in the pipeline, and the pressure P2 of the exhaust gas in the pipeline is greater than the pressure P1 inside the equipment.

6. The zero exhaust gas leakage multi-purpose horizontal push-pull valve structure according to claim 1 is characterized in that: It also includes a cylinder (4), the output end of which is connected to the moving shaft (2) to control the linear movement of the moving shaft (2).

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