Flue switching valve

Abstract

The utility model discloses a flue switching valve relates to high temperature switching valve field, aims at solving the problem of the deformation of valve body caused by high temperature in the prior art, adopts the technical scheme, including the valve core, the valve core is connected with the air cylinder, is connected with the valve body on the valve box, and the valve body is the tubular structure of one end open and one end closed, and the valve body side wall is opened to have the smoke hole, and the valve core is slidably contacted with the valve body in the open end port, and the push mechanism is equipped outside the closed end, and the push mechanism's push part is connected with the valve core, and the main part of valve core is the closed core of tubular. By adopting the tubular structure of casting for the valve body, the valve core moves up and down in the valve body, can utilize the high temperature resistance of casting, keeps the stability of valve body and valve core form in the high temperature flue gas flow process, can maintain the stable sealing closure of air hole under the valve closed state, ensures full combustion and up to standard emission.

Description

Technical Field

[0001] This utility model relates to the field of high temperature switching valve technology, specifically a flue switching valve. Background Technology

[0002] In regenerative thermal oxidizers, the high-temperature flue gas generated during combustion needs to flow through a flue to the preheating cylinder or be discharged. Existing flue gas switching valves, such as... Figure 1 As shown, it achieves closure by directly sealing the air vents through the sealing core 5. However, since the flue gas temperature at the outlet of the oxidation chamber is as high as 700-900℃, the high temperature will cause the box to deform, resulting in a decrease in the sealing performance of the air vents, a large amount of tar residue, and a drop in the combustion chamber temperature, causing the emission to exceed the standard. At the same time, a large amount of residual tar may cause ignition and combustion when a high-temperature airflow enters. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the existing defects and provide a flue switching valve that can effectively solve the problems in the background art.

[0004] To achieve the above objectives, this utility model discloses a flue gas switching valve. The technical solution includes a valve core connected to a cylinder, a valve body connected to a valve box, and a cylindrical structure with one open end and one closed end. A smoke passage hole is opened on the side wall of the valve body. The valve core is slidably contacted at the open end of the valve body, and a pushing mechanism is installed outside the closed end. The pushing part of the pushing mechanism is connected to the valve core. The pushing mechanism closes the valve when the valve core closes the open end of the valve body, thus achieving a sealing effect. The valve body is integrally cast, has strong high-temperature resistance, and will not deform under high-temperature flue gas conditions.

[0005] As a preferred embodiment of this utility model, the closed end of the valve body is also connected to a connecting plate, and the pushing mechanism is connected to the connecting plate.

[0006] In a preferred embodiment of this invention, the pushing mechanism is a cylinder, and the cylinder's pushing rod is connected to the valve core. The cylinder can push the valve core to move.

[0007] In a preferred embodiment of this invention, the valve core includes a sealing core, with a pressure plate assembly and a fixing plate assembly connected to its two end faces respectively. The sealing core is sandwiched between the pressure plate assembly and the fixing plate assembly, and the pressure plate assembly and the fixing plate assembly are connected to the push rod of the cylinder. The pressure plate assembly applies pressure and the fixing plate assembly applies tension, providing a stable external force as the valve core moves.

[0008] In a preferred embodiment of this invention, both the valve body's closed end and the closed core are connected to guide wheels, which slide in contact with the pushing mechanism of the pushing mechanism. This guide wheel prevents the cylinder push rod from deviating, ensuring the correct movement direction of the valve core.

[0009] Compared with the prior art, the beneficial effects of this utility model are as follows: By adopting a cast cylindrical structure for the valve body, the valve core moves up and down within the valve body. This allows the high-temperature resistance of the casting to maintain the stability of the valve body and valve core shape during the flow of high-temperature flue gas. When the valve is closed, it can maintain the stable sealing of the air hole, avoid tar residue, and ensure complete combustion and compliance with emission standards. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the existing technology structure; Figure 2 This is a front view structural diagram of the present invention; Figure 3 This is a side view of the structure of this utility model; Figure 4 This is a schematic diagram of the internal structure of this utility model; Figure 5 This is a top view of the structure of this utility model; Figure 6 This is a schematic diagram of the valve body structure of this utility model.

[0011] In the diagram: 1. Valve box; 101. Main air duct; 102. First branch duct; 103. Second branch duct; 2. Connecting flange; 3. Air duct flange; 4. Valve body; 401. Connecting plate; 5. Sealing core; 7. Valve core; 8. Fixing plate assembly; 9. Cylinder. Detailed Implementation

[0012] 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. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0013] Example 1 The system includes a valve box 1, which comprises a main air duct 101, a first branch duct 102, and a second branch duct 103. The width of the main air duct 101 is the sum of the widths of the first branch duct 102 and the second branch duct 103. The first branch duct 102 is located on the upper left side of the main air duct 101, and the second branch duct 103 is located on the lower right side of the main air duct 101. The first branch duct 102 and the second branch duct 103 are connected to the main air duct 101 through air vents. A switching valve is installed on both the first branch duct 102 and the main air duct 101. Figures 2 to 6As shown, the technical solution adopted includes a valve body 4, which is a longitudinal cylindrical structure with an open bottom. An array of smoke passage holes are arranged on its side wall. A connecting plate 401 is located on the top surface of the valve body 4. A vertically mounted cylinder 9 is mounted on the top surface of the connecting plate 401. The push rod of the cylinder 9 passes through the connecting plate 401 and the top surface of the valve body 4 to enter the interior of the valve body 4. A valve core 7 is slidably connected inside the valve body 4. The main body of the valve core 7 is a closed core 5, which is a steel pipe. An upper end plate is connected to the upper end face. A "well" shaped grid is connected to the inner wall of the closed core 5. A base plate is welded to the bottom surface of the central grid. A fixing plate assembly 8 is bolted to the bottom of the base plate. A central hole is provided on both the upper end plate and the fixing plate assembly 8. A clamping pipe is engaged in the central hole of the upper end plate. The push rod of the cylinder 9 is engaged in the clamping pipe and the central hole of the fixing plate assembly 8. To prevent the push rod from tilting, three first guard rollers arranged in a ring array are installed on the bottom surface of the connecting plate 401. The first guard rollers extend into the valve body 4. Three second guard rollers are arranged in a ring array around the center hole of the fixing plate group 8. The first guard rollers and the second guard rollers slide in contact with the push rod of the cylinder 9.

[0014] To connect adjacent air ducts, the main air duct 101 port has a connecting flange 2, and the first branch duct 102 and the second branch duct 103 port have air duct flanges 3.

[0015] Cylinder 9 is connected to an air control line, which is connected to an air source.

[0016] The working principle of this utility model: When the switching valve needs to be closed, the pneumatic control line drives the cylinder 9 to extend, causing the valve core 7 to descend and close the lower end of the valve body 4; when the switching valve needs to be opened, the pneumatic control line drives the cylinder 9 to retract, causing the valve core 7 to rise and open the lower end of the valve body 4.

[0017] During use, the cast valve body 4 and the closed core 5 formed by the steel pipe can effectively resist high temperature. The grid in the closed core 5 can also strengthen the steel pipe to prevent it from deforming.

[0018] The circuits and mechanical connections involved in this utility model are common practices used by those skilled in the art, and technical inspiration can be obtained through a limited number of experiments. They are common knowledge.

[0019] Components not described in detail in this article are existing technologies.

[0020] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A flue gas switching valve, comprising a valve core (7) connected to a cylinder (9), characterized in that: A valve body (4) is connected to the valve box (1). The valve body (4) is a cylindrical structure with one end open and the other end closed. A smoke passage is opened on the side wall of the valve body (4). A valve core (7) is slidably contacted at the open end of the valve body (4). A pushing mechanism is installed outside the closed end. The pushing part of the pushing mechanism is connected to the valve core (7). When the pushing mechanism causes the valve core (7) to close the open end of the valve body (4), it can close the valve and play a blocking role.

2. The flue gas switching valve according to claim 1, characterized in that: The valve body (4) is closed at one end and is connected to a connecting plate (401), and the pushing mechanism is connected to the connecting plate (401).

3. The flue gas switching valve according to claim 2, characterized in that: The pushing mechanism is a cylinder (9), and the pushing rod of the cylinder (9) is connected to the valve core (7).

4. The flue switching valve according to claim 3, characterized in that: The valve core (7) includes a sealing core (5), and the two ends of the sealing core (5) are respectively connected to a pressure plate group and a fixing plate group (8). The sealing core (5) is sandwiched between the pressure plate group and the fixing plate group (8), and the pressure plate group and the fixing plate group (8) are connected to the push rod of the cylinder (9).

5. The flue gas switching valve according to claim 1, characterized in that: The valve body (4) and the sealing core (5) are both connected to guide wheels, and the guide wheels slide in contact with the pushing mechanism of the pushing mechanism.

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