Lift valve cylinder protection device for RTO waste gas treatment equipment

Abstract

The utility model relates to the technical field of industrial waste gas combustion treatment, in particular to a lift valve cylinder protection device for RTO waste gas treatment equipment, which comprises a valve body, a valve plate and a valve rod, a gas inlet box and a gas exhaust box are arranged on one side of the valve body, and a cylinder is arranged on the other side of the valve body; the air cylinder is connected with the valve plate through the valve rod and pushes the valve plate to seal the valve body, a connecting shaft is arranged at the output end of the air cylinder, a floating connector is connected between the connecting shaft and the valve rod, and the connecting shaft is coaxially connected with the valve rod through the floating connector. The valve rod is vertically arranged in the valve body, one end of the valve rod extends out of the valve body and is sleeved with a guide sleeve, a sealing assembly is arranged on the outer side of the guide sleeve, and the sealing assembly abuts against the outer side face of the valve body. The floating connector is arranged between the air cylinder and the valve rod, so that installation deviation can be eliminated, and the phenomena of jamming and abrasion caused by uneven stress in the stretching and retracting process due to lateral stress of the air cylinder are avoided; therefore, the lift valve works more stably.

Description

Technical Field

[0001] This utility model relates to the field of industrial waste gas combustion treatment technology, and in particular to a lifting valve cylinder protection device for RTO waste gas treatment equipment. Background Technology

[0002] RTO (Regenerative Thermal Oxidizer) is a thermal combustion waste gas treatment technology consisting of a combustion device, a regenerator (containing a heat storage medium), a valve system, a flue gas system, and connecting pipes. Its working principle is as follows: organic waste gas is heated to above 750℃, causing the organic matter in the waste gas to oxidize and decompose into carbon dioxide and water. The high-temperature gas produced by the oxidation reaction flows through the heat storage medium, causing the medium to heat up and "store heat." The stored heat is used to preheat the subsequently entering organic waste gas, thus "releasing heat," reducing the amount of fuel required for the waste gas heating process. After the heat storage medium "releases heat," an appropriate amount of air is immediately introduced for purging, thereby completing one working cycle (heat storage – heat release – purging). In the RTO waste gas treatment process, the waste gas control valve is one of the most critical pieces of equipment; the quality of the waste gas control valve directly affects the overall RTO treatment effect. Among them, the lift valve has gradually become the mainstream RTO control valve due to its advantages such as precise flow control and stable operation.

[0003] The lift valves in existing RTO waste gas treatment equipment have the following common problems:

[0004] 1) The valve disc assembly has a simple structure and poor sealing effect, which can easily cause exhaust gas leakage;

[0005] 2) The lack of support elements at the connection points of the various connecting shafts causes misalignment between the cylinder and the valve stem, which can easily lead to positional shifts, resulting in jamming and wear. Utility Model Content

[0006] In order to address the technical defects mentioned in the background art, the purpose of this utility model is to provide a lifting valve cylinder protection device for RTO exhaust gas treatment equipment. This device aims to solve the problems of poor sealing effect of the lifting valve in the prior art, and the misalignment between the valve body and the cylinder, which easily leads to positional displacement. It also provides a protection device with strong sealing performance, stable operation, and extended cylinder life.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A lifting valve cylinder protection device for an RTO exhaust gas treatment equipment includes a valve body, a valve plate, and a valve stem. An air inlet box and an air outlet box are provided on one side of the valve body, and a cylinder is provided on the other side. The cylinder is connected to the valve plate via the valve stem and pushes the valve plate to close the valve body. A connecting shaft is provided at the output end of the cylinder. A floating joint connects the connecting shaft and the valve stem, and the connecting shaft is coaxially connected to the valve stem via the floating joint. The valve stem is vertically disposed within the valve body, and one end of the valve stem extends out of the valve body and is fitted with a guide sleeve. A sealing component is provided on the outer side of the guide sleeve, and the sealing component abuts against the outer surface of the valve body.

[0009] Preferably, the floating joint includes a first connecting part and a second connecting part, the first connecting part is fixedly connected to the valve stem, the second connecting part is fixedly connected to the connecting shaft, and the first connecting part and the second connecting part are hinged by a spherical bearing.

[0010] Preferably, the sealing assembly includes a sealing ring, a pressure plate, and a pressure cap. The sealing ring is sleeved on the outside of the guide sleeve, and a sealing ring sealing plate is provided on the outside of the sealing ring. The pressure cap is fixedly connected to the top of the sealing ring by bolts, and a gasket is provided inside the pressure cap. The gasket is sleeved on the valve stem. The pressure plate is disposed between the sealing ring and the pressure cap.

[0011] Preferably, the air intake box and the exhaust box are mounted on the valve body by a fixing bracket, and the air intake box and the exhaust box are respectively provided with an air inlet and an exhaust outlet on the side facing the valve body, and the air inlet or exhaust outlet is connected to the valve plate cover.

[0012] Preferably, the output end of the cylinder is further provided with a displacement sensor, which is electrically connected to an external control system.

[0013] Preferably, the valve plate is disposed at the connection between the valve body and the intake box or exhaust box, and the center of the valve plate, the valve stem and the cylinder are located on the same axis.

[0014] Preferably, the other end of the valve stem is connected to the valve plate by a threaded connection, and a nut is fitted on the valve stem, the nut abutting against both sides of the valve plate.

[0015] Preferably, the valve body is a pipe structure with openings at both ends, and flange interfaces are provided on the openings at both ends of the valve body. The valve body is externally connected to the RTO exhaust gas treatment equipment through the flange interfaces.

[0016] Preferably, a protective cover is also provided between the cylinder and the sealing assembly.

[0017] In summary, the beneficial effects of this utility model are as follows:

[0018] This invention eliminates installation deviations by using a floating joint between the cylinder and the valve stem, preventing uneven force on the cylinder during extension and retraction, which can lead to jamming and wear. Simultaneously, the combination of the floating joint and the guide sleeve forces the valve stem to maintain linear movement, preventing exhaust gas leakage due to misalignment and making the lift valve more stable. Furthermore, a sealing assembly strengthens the sealing connection between the valve stem and the valve body, preventing seal failure due to misalignment and thus improving the valve body's sealing effect. Attached Figure Description

[0019] Figure 1 This is a cross-sectional view of the lifting valve cylinder protection device for RTO exhaust gas treatment equipment of this utility model;

[0020] Figure 2 for Figure 1 A magnified view of the sealing assembly and floating joint at point a.

[0021] Explanation of the reference numerals in the figure:

[0022] 1. Valve body; 11. Flange interface; 2. Valve plate; 3. Valve stem; 31. Nut; 4. Air inlet box; 41. Air inlet; 5. Exhaust box; 51. Exhaust port; 6. Cylinder; 61. Connecting shaft; 62. Displacement sensor; 7. Guide sleeve; 8. Sealing assembly; 81. Sealing ring; 811. Sealing ring sealing plate; 82. Pressure plate; 83. Pressure cap; 831. Washer; 9. Floating joint; 91. First connecting part; 92. Second connecting part; 93. Spherical bearing; 10. Protective cover. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the present utility model.

[0024] Those skilled in the art should understand that, in the disclosure of this utility model, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on this utility model.

[0025] In the description of this utility model, the use of terms such as "several" means one or more, with "multiple" meaning two or more. Terms like "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of terms like "first," "second," and "third" is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, the quantity of indicated technical features, or the sequential relationship between indicated technical features.

[0026] The following is in conjunction with the appendix Figure 1-2 The present invention provides a more detailed description of an embodiment of a lifting valve cylinder protection device for an RTO waste gas treatment equipment.

[0027] A protective device for the lifting valve cylinder 6 of an RTO exhaust gas treatment equipment, such as Figure 1 , 2 As shown, the valve includes a valve body 1, a valve plate 2, and a valve stem 3. An air inlet box 4 and an exhaust box 5 are located on one side of the valve body 1, and a cylinder 6 is located on the other side. The valve plate 2 is positioned at the connection between the valve body 1 and the air inlet box 4 or the exhaust box 5, and the centers of the valve plate 2, valve stem 3, and cylinder 6 are located on the same axis. The valve stem 3 is vertically positioned inside the valve body 1, with one end connected to the valve plate 2 and the other end extending out of the valve body 1 and connected to the cylinder 6. A guide sleeve 7 is fitted onto the end of the valve stem 3 extending out of the valve body 1, and a sealing assembly 8 is provided on the outer side of the guide sleeve 7, abutting against the outer surface of the valve body 1. The cylinder 6 is connected to the valve plate 2 via the valve stem 3 and pushes the valve plate 2 to close the valve body 1. A connecting shaft 61 is provided at the output end of the cylinder 6, and a floating joint 9 connects the connecting shaft 61 and the valve stem 3, with the connecting shaft 61 coaxially connected to the valve stem 3 via the floating joint 9.

[0028] Specifically, a graphite copper alloy self-lubricating bushing is press-fitted into the inner wall of the guide sleeve 7 fitted at the end of the valve stem 3 extending out of the valve body 1 to reduce friction during the movement of the valve stem 3; the RTO waste gas treatment equipment and incinerator equipment are started to allow waste gas to enter the inlet box 4; the valve stem 3 is driven by the cylinder 6 to press the valve plate 2 against the inlet of the valve body 1, and the sealing condition between the valve plate 2 and the inlet 41 and outlet is observed to check for waste gas leakage; then, according to the actual production situation, the cylinder 6 is driven to adjust the lifting and lowering of the valve stem 3, and the floating joint 9 is used to prevent the position between the connecting shaft 61 and the valve stem 3 from shifting, which could lead to the leakage of untreated waste gas and cause environmental pollution.

[0029] The valve body 1 operates in the following states during its operation:

[0030] In the closed state: the cylinder 6 drives the connecting shaft 61 to move down, so that the valve stem 3 drives the valve plate 2 to press against the air intake box 4 or the exhaust box 5, and the sealing assembly 8 tightly fits the connection between the valve body 1 and the valve stem 3 to form a high-temperature seal.

[0031] Open state: Cylinder 6 retracts, valve plate 2 rises, exhaust gas enters valve body 1 through intake box 4, and is discharged from exhaust box 5 after processing.

[0032] Adaptive adjustment: The floating joint 9 adaptively adjusts the concentricity of the connecting shaft 61 and the valve stem 3 through the spherical bearing 93, and the guide sleeve 7 constrains the linear movement of the valve stem 3 to avoid deviation that could lead to sealing failure.

[0033] In this embodiment, as Figure 2 As shown, the floating joint 9 includes a first connecting part 91 and a second connecting part 92. The first connecting part 91 is fixedly connected to the valve stem 3, and the second connecting part 92 is fixedly connected to the connecting shaft 61. The first connecting part 91 and the second connecting part 92 are hinged together by a spherical bearing 93. The spherical bearing 93 allows for multi-directional micro-oscillation between the connecting shaft 61 and the valve stem 3, compensating for installation errors and ensuring that the axes of the cylinder 6, the valve stem 3, and the valve plate 2 always coincide.

[0034] Specifically, the first connecting part 91 of the floating joint 9 is threaded to the guide rod, and the second connecting part 92 is welded to the connecting shaft 61. The two are oscillating in multiple directions through the ball bearing 93, so that the connecting shaft 61 can be adjusted accordingly according to the position of the valve stem 3 to ensure that the center of the valve plate 2, valve stem 3 and cylinder 6 is kept on the same axis, thereby avoiding positional deviation and exhaust gas leakage.

[0035] In this embodiment, as Figure 1 As shown, the sealing assembly 8 includes a sealing ring 81, a pressure plate 82, and a pressure cap 83. The sealing ring 81 is sleeved on the outside of the guide sleeve 7, and a sealing ring 81 sealing plate is provided on the outside of the sealing ring 81. The pressure cap 83 is fixedly connected to the top of the sealing ring 81 by bolts, and a washer 831 is provided inside the pressure cap 83. The washer 831 is sleeved on the valve stem 3. The pressure plate 82 is disposed between the sealing ring 81 and the pressure cap 83.

[0036] Specifically, the sealing ring 81 is fitted over the outside of the guide sleeve 7, and the sealing ring 81 sealing plate is installed. Then, the pressure plate 82, the pressure cap 83, and the gasket 831 are installed in sequence. The pressure cap 83 is fixed to the top of the sealing ring 81 with bolts to ensure that the sealing assembly 8 abuts against the outer surface of the valve body 1 to guarantee the sealing effect. The sealing ring 81 is made of fluororubber and is fitted over the outside of the guide sleeve 7, tightly abutting against the outer surface of the valve body 1. The pressure plate 82 is pressed and fixed by the pressure cap 83, which is connected to the valve body 1 by bolts. The gasket 831 embedded in the pressure cap 83 is made of polytetrafluoroethylene to enhance the sealing performance.

[0037] In this embodiment, the air intake box 4 and the exhaust box 5 are mounted on the valve body 1 by means of a fixing bracket, and the air intake box 4 and the exhaust box 5 are respectively provided with an air inlet 41 and an exhaust outlet 51 on the side facing the valve body 1. The air inlet 41 and the exhaust outlet 51 are respectively covered and connected to the valve plate 2.

[0038] Specifically, both the intake box 4 and the exhaust box 5 are rectangular box structures, and an intake port 41 and an exhaust port 51 are opened on one side of the intake box 4 and the exhaust box 5 to connect to the valve body 1. The valve plate 2 is set at the intake port 41 and the exhaust port 51 to adjust the opening and closing. The valve plate 2 is composed of two plates spliced ​​together, and the valve plate 2 is adapted to the intake port 41 or the exhaust port 51. The valve rod 3 controls the opening and closing of the valve plate 2, so that the valve body 1 can automatically adjust the intake or exhaust according to the working status of the waste gas treatment equipment.

[0039] To further enhance the intelligence of the lifting valve, a displacement sensor 62 is also provided at the output end of the cylinder 6. The displacement sensor 62 is electrically connected to the external control system; thus, it can monitor the stroke data in real time and transmit it to the PLC control system, so as to adjust the lifting and lowering of the valve stem 3 according to the actual production situation.

[0040] In this embodiment, the valve stem 3 is connected to the valve plate 2 by a threaded connection, and a nut 31 is fitted on the valve stem 3, which abuts against both sides of the valve plate 2.

[0041] Specifically, the valve stem 3 is vertically inserted into the valve body 1, so that one end of the valve stem 3 is connected to the valve plate 2 through a threaded connection. Then, a nut 31 is fitted onto the valve stem 3 and tightened so that it abuts against both sides of the valve plate 2, ensuring that the valve stem 3 and the valve plate 2 are firmly connected and preventing loosening during operation.

[0042] In this embodiment, the valve body 1 is a pipe structure with openings at both ends, and flange interfaces 11 are provided on the openings at both ends of the valve body 1. The valve body 1 is externally connected to the RTO exhaust gas treatment equipment through the flange interfaces 11.

[0043] Specifically, the lift valve is composed of two sets of valve bodies 1 spliced ​​together. The inner cavities of the two sets of valve bodies 1 are interconnected, and the air inlet box 4 and the exhaust box 5 are respectively set on a single valve body 1. The two ends of the valve body 1 are connected to the incinerator equipment through flange interfaces 11. The entire lift valve is located on the lower side of the incinerator equipment, which can reduce the surface corrosion of the lift valve by high-temperature exhaust gas and help extend the service life of the equipment.

[0044] To further enhance the protection of cylinder 6, a protective cover 10 is also fitted between cylinder 6 and sealing assembly 8. The protective cover 10 protects the connection between valve stem 3 and cylinder 6, and also prevents dust and other debris from entering the floating joint 9, thus extending the service life of the equipment.

[0045] The working principle of this utility model:

[0046] The valve body 1 is installed at the bottom of the RTO system, and the equipment is started. Under the action of the cylinder 6, the connecting shaft 61 is driven to move downward, causing the valve plate 2 to press against the inlet of the valve body 1. The exhaust gas enters the RTO system through the inlet box 4. After the exhaust gas is treated by the RTO system, the cylinder 6 located on the exhaust box 5 drives the valve rod 3 to move the valve plate 2 away from the exhaust port 51 on the valve body 1, thereby allowing the exhaust gas to be discharged from the exhaust box 5. During the process of the cylinder 6 driving the valve rod 3, the floating joint 9 can constrain the connecting shaft 61 and the valve rod 3 to be on the same axis and force the valve rod 3 to make linear movement. At the same time, the floating joint 9 can also absorb the installation error of the cylinder 6, ensuring that the valve plate 2 presses against the inlet 41 or the exhaust port 51 evenly. The displacement sensor 62 on the cylinder 6 can trigger an alarm when abnormal stroke is detected, which facilitates timely maintenance.

[0047] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A lifting valve cylinder protection device for an RTO waste gas treatment equipment, comprising a valve body, a valve plate, and a valve stem, characterized in that: An air inlet box and an air outlet box are provided on one side of the valve body, and a cylinder is provided on the other side. The cylinder is connected to the valve plate through a valve stem and pushes the valve plate to close the valve body. A connecting shaft is provided at the output end of the cylinder. A floating joint is connected between the connecting shaft and the valve stem, and the connecting shaft is coaxially connected to the valve stem through the floating joint. The valve stem is vertically arranged in the valve body, and one end of the valve stem extends out of the valve body and is fitted with a guide sleeve. A sealing component is provided on the outside of the guide sleeve, and the sealing component abuts against the outer surface of the valve body.

2. The lifting valve cylinder protection device for RTO waste gas treatment equipment according to claim 1, characterized in that, The floating joint includes a first connecting part and a second connecting part. The first connecting part is fixedly connected to the valve stem, and the second connecting part is fixedly connected to the connecting shaft. The first connecting part and the second connecting part are hinged by a spherical bearing.

3. The lifting valve cylinder protection device for RTO waste gas treatment equipment according to claim 1, characterized in that, The sealing assembly includes a sealing ring, a pressure plate, and a pressure cap. The sealing ring is sleeved on the outside of the guide sleeve, and a sealing ring sealing plate is provided on the outside of the sealing ring. The pressure cap is fixedly connected to the top of the sealing ring by bolts, and a gasket is provided inside the pressure cap. The gasket is sleeved on the valve stem. The pressure plate is located between the sealing ring and the pressure cap.

4. The lifting valve cylinder protection device for RTO waste gas treatment equipment according to claim 1, characterized in that, The air intake box and the exhaust box are mounted on the valve body by a fixing bracket, and the air intake box and the exhaust box are respectively provided with an air inlet and an exhaust outlet on the side facing the valve body. The air inlet or exhaust outlet is connected to the valve plate cover.

5. The lifting valve cylinder protection device for RTO waste gas treatment equipment according to claim 1, characterized in that, The cylinder's output end is also equipped with a displacement sensor, which is electrically connected to an external control system.

6. The lifting valve cylinder protection device for RTO waste gas treatment equipment according to claim 1, characterized in that, The valve plate is located at the connection between the valve body and the intake or exhaust box, and the center of the valve plate, valve stem and cylinder are located on the same axis.

7. The lifting valve cylinder protection device for RTO waste gas treatment equipment according to claim 1, characterized in that, The other end of the valve stem is connected to the valve plate by a threaded connection, and a nut is fitted on the valve stem, which abuts against both sides of the valve plate.

8. The lifting valve cylinder protection device for RTO waste gas treatment equipment according to claim 1, characterized in that, The valve body is a pipe structure with openings at both ends, and flange interfaces are provided on the openings at both ends of the valve body. The valve body is externally connected to the RTO exhaust gas treatment equipment through the flange interfaces.

9. The lifting valve cylinder protection device for RTO waste gas treatment equipment according to claim 1, characterized in that, A protective cover is also provided between the cylinder and the sealing assembly.

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