Heat treatment quenching furnace burner and burner flexible connection device capable of being quickly disassembled and assembled

Abstract

The utility model discloses a heat treatment quenching furnace burner and burner flexible connection device capable of being quickly disassembled and assembled, belongs to the technical field of heat treatment furnace equipment, and discloses a gas connection device for quickly disassembling and assembling a burner and a burner. According to the technical scheme, the inner wall of a metal corrugated pipe is coated with a corrosion-resistant inner coating, the periphery of the metal corrugated pipe is sleeved with a metal wire woven protective layer, an end pressing sleeve is a circular ring, the inner wall of the end pressing sleeve, the periphery of the metal corrugated pipe and the metal woven protective layer are pressed and welded into a whole, and the periphery of the end pressing sleeve is sleeved with a universal connecting flange. A gap of 1-2 mm is formed between an inner hole of each universal connecting flange and the outer wall of the corresponding end pressing sleeve, the universal connecting flanges at the two ends of the metal corrugated pipe are connected with the burner and the connecting flanges at the two ends of the control valve set through bolts respectively, and an asbestos sealing gasket and a polychlorotetrafluoroethene sealing gasket are placed between the connecting flanges. According to the utility model, the safe connection between the control valve group of the heat treatment quenching furnace and the burner burner can be realized, the disassembly and assembly are convenient, and the time for replacing the device is reduced.

Description

Technical Field

[0001] The utility model relates to a gas soft connection device used for a burner burner of a heat treatment quenching furnace, belonging to the technical field of heat treatment furnace equipment. Background Art

[0002] In the heat treatment quenching furnace, the combustion control system is mainly composed of four parts: the preheating burner, the gas valve and pipeline accessories in front of the burner, the radiation tube and the burner controller. The gas branch pipe to the burner interface is composed of a maintenance hand valve, a pneumatic control valve, a manual regulating valve and pipeline connection accessories, and a metal bellows.

[0003] In the production of quenching furnaces, when the calorific value pressure of the gas suddenly increases, the combustion is incomplete, and the flame burns inside the flue gas pipe, the non-metallic exhaust pipe with multiple burners will be burned, and the flames and high-temperature radiation will directly bake various valves and metal bellows of the gas branch pipe. The metal exhaust pipe will catch fire and burn the pneumatic ball valve, which will cause the valve to close loosely and leak internally. Because the temperature inside the radiation tube is greater than 800℃ when the burner is in the pulse closed state, the leaked gas leaks into the radiation tube and burns directly. When the gas leakage is small, part of the gas does not reach the radiation tube, but ignites inside the metal bellows, and the flame burns inside the metal bellows. The low-temperature, humid and highly corrosive flowing gas inside the metal bellows is directly baked by the external flame and high-temperature radiation, which causes stress cracking of the weld of the metal bellows. The burning and leakage of the metal bellows will cause a production stoppage accident in which the burner cannot be used normally. It is very difficult to resume equipment shutdown, and the processing time is generally about 20 hours. At the same time, there are major equipment safety hazards such as gas leakage, fire and explosion.

[0004] At present, the control valve group of the heat treatment quenching furnace and the burner are connected by traditional standard threads. The threaded pipe connection is easy to rust and difficult to remove. The torsional shear force during strong rotation will damage the gas connection hard pipes, increasing the difficulty of maintenance and prolonging the time of replacing the device. Therefore, it is very necessary to improve the existing metal bellows connection structure between the control valve group of the heat treatment quenching furnace and the burner. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a soft connection device for a burner of a heat treatment quenching furnace that can be quickly disassembled and assembled. The soft connection device can realize the safe connection between the control valve group of the heat treatment quenching furnace and the burner, and the disassembly and assembly are convenient and the operation is simple, which reduces the time for replacing the device, improves the efficiency of maintenance work, and reduces the economic losses caused by production stoppage.

[0006] The technical solution to solve the above technical problems is:

[0007] A quickly disassembled and assembled soft connection device for a burner of a heat treatment quenching furnace comprises a metal bellows, a corrosion-resistant inner coating, a metal wire braided protective layer, an end sleeve, a universal connection flange, an asbestos sealing gasket, and a polychlorotetrafluoroethylene sealing gasket. The corrosion-resistant inner coating is coated on the inner wall of the metal bellows, the metal wire braided protective layer is sleeved on the outer periphery of the metal bellows, the metal braided protective layer and the metal bellows are closely matched, the end sleeve is a circular ring, the front end of the circular ring of the end sleeve has an annular protrusion, the inner wall of the end sleeve is connected to the outer periphery of the metal bellows The circumference and the metal braided protective layer are pressed and welded as a whole, the universal connecting flange is sleeved on the outer circumference of the end sleeve, the front end of the universal connecting flange is stuck in the rear of the annular protrusion at the front end of the end sleeve, and there is a 1-2mm gap between the inner hole of the universal connecting flange and the outer wall of the end sleeve. The universal connecting flanges at both ends of the metal bellows are respectively connected to the connecting flanges at both ends of the burner and the control valve group by bolts, and asbestos sealing gaskets and polychlorotetrafluoroethylene sealing gaskets are placed between the end face of the universal connecting flange and the end face of the connecting flange of the burner and the control valve group.

[0008] The above-mentioned quickly disassembled and assembled heat treatment quenching furnace burner burner soft connection device, the corrosion-resistant inner coating is a cast non-metallic anti-corrosion material, and the corrosion-resistant inner coating is attached to the inner wall of the metal bellows by centrifugal casting.

[0009] The above-mentioned quickly disassembled and assembled heat treatment quenching furnace burner burner flexible connection device has gas fluid turbulence ripples on the inner wall of the metal bellows, and the gas fluid turbulence ripples are evenly arranged along the length direction of the metal bellows.

[0010] The above-mentioned quickly disassembled and assembled heat treatment quenching furnace burner burner soft connection device has a metal graphite wound gasket between the universal connection flange and the burner and control valve group connection flange, and the metal graphite wound gasket is installed on the end face of the burner and control valve group connection flange.

[0011] The beneficial effects of the utility model are:

[0012] The corrosion-resistant inner coating on the inner wall of the metal bellows of the utility model is in direct contact with the gas medium, which protects the main body of the metal bellows to the greatest extent; the metal bellows is made of high-toughness stainless steel, which is more convenient to install; the metal wire braided protective layer is sheathed on the outer periphery of the metal bellows, which can protect the metal bellows from bending, deformation and breaking under the lateral action of external force; a rotation gap is left between the universal connecting flange and the outer periphery of the end pressure sleeve, which is convenient for installing the connecting flanges on both sides of the burner and the control valve group at various angles; asbestos sealing gaskets, polychlorotetrafluoroethylene sealing gaskets and metal graphite winding gaskets can effectively seal the end face of the universal connecting flange and the end face of the connecting flange of the burner and the control valve group.

[0013] The utility model discloses the utility model has the advantages of simple structure, light weight, simple operation, low cost, quick and safe assembly and disassembly, and can replace the gas leakage device by removing the flange fastening bolts when the gas leakage device is damaged, effectively avoiding the phenomenon that the torsional shear force damages the gas connection hard pipe when the traditional standard threaded connection is dismantled, reducing the time of replacing the device, improving the efficiency of maintenance work, and reducing the economic loss caused by production suspension. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the utility model.

[0015] The markings in the figure are as follows: metal bellows 1, corrosion-resistant inner coating 2, metal wire braided protective layer 3, end sleeve 4, annular protrusion 5, universal connecting flange 6, flange hole 7, asbestos sealing gasket 8, polychlorotetrafluoroethylene sealing gasket 9, gas fluid turbulent flow corrugation 10, gas flow lumen 11. DETAILED DESCRIPTION

[0016] The utility model is composed of a metal bellows 1, a corrosion-resistant inner coating 2, a metal wire braided protective layer 3, an end pressure sleeve 4, a universal connecting flange 6, an asbestos sealing gasket 8 and a polychlorotetrafluoroethylene sealing gasket 9.

[0017] As shown in the figure, the main body of the flexible connection device of the utility model is a metal bellows 1, which is made of high-toughness and corrosion-resistant 316 stainless steel, with increased wall thickness, improved toughness, improved high-temperature baking resistance and corrosion resistance, and extended service life.

[0018] The figure shows that the corrosion-resistant inner coating 2 is coated on the inner wall of the metal bellows 1. The corrosion-resistant inner coating 2 is a polychlorotetrafluoroethylene cast non-metallic anti-corrosion material, and the corrosion-resistant inner coating 2 is externally attached to the inner wall of the metal bellows 1 by centrifugal casting. The corrosion-resistant inner coating 2 is directly in contact with the gas medium in the gas flow cavity 11 of the metal bellows 1 to protect the metal bellows 1 to the maximum extent and avoid the corrosion of the gas medium on the inner wall of the metal bellows 1.

[0019] As shown in the figure, the metal wire braided protective layer 3 is sleeved on the outer periphery of the metal bellows 1. The metal wire braided protective layer 3 is woven with fine metal wires. The metal braided protective layer 3 is tightly sleeved on the outer periphery of the metal bellows 1 and is tightly matched with the metal bellows 1. The metal braided protective layer 3 can protect the metal bellows 1 from bending, deformation, and breaking under the lateral action of external force.

[0020] As shown in the figure, the end sleeve 4 is a circular ring, and the front end of the circular ring of the end sleeve 4 has an annular protrusion 5. The inner wall of the end sleeve 4 is pressed and welded with the outer periphery of the metal bellows 1 and the metal braided protective layer 3 as a whole.

[0021] The figure shows that the universal connection flange 6 is sleeved on the outer periphery of the end sleeve 4, and the front end of the universal connection flange 6 is stuck in the rear part of the annular protrusion 5 at the front end of the end sleeve 4, and will not be separated from the end sleeve during connection. There is a gap of 1-2mm between the inner hole of the universal connection flange 6 and the outer wall of the end sleeve 4. The universal connection flange 6 can rotate around the end sleeve 4, which is convenient for installing the connection flanges on both sides of the burner and the control valve group at various angles.

[0022] The figure shows that the circumference of the universal connection flange 6 is evenly distributed with multiple flange holes 7. The universal connection flanges 6 at both ends of the metal bellows are connected to the end faces of the connection flanges at both ends of the burner and the control valve group by bolts. Asbestos sealing gaskets 8 and polychlorotetrafluoroethylene sealing gaskets 9 are placed between the end faces of the universal connection flange 6 and the end faces of the connection flanges of the burner and the control valve group. There is also a metal graphite wound gasket between the universal connection flange 6 and the connection flanges of the burner and the control valve group. The metal graphite wound gasket is installed on the end faces of the connection flanges of the burner and the control valve group. The asbestos sealing gasket 8, polychlorotetrafluoroethylene sealing gasket 9 and the metal graphite wound gasket can effectively seal the end faces of the universal connection flange 6 and the end faces of the connection flanges of the burner and the control valve group.

[0023] The figure shows that there are gas fluid turbulence ripples 10 on the inner wall of the metal bellows 1, and the gas fluid turbulence ripples 10 are evenly arranged along the length direction of the metal bellows 1. The gas medium passes through the gas fluid turbulence ripples 10 in the gas fluid lumen 11 to form a disturbed turbulent flow, and is sprayed into the burner combustion system cavity to be fully mixed with air for combustion production.

[0024] The use process of the utility model is as follows:

[0025] The utility model is installed between the control valve group and the burner of the heat treatment quenching furnace.

[0026] During the normal production of the heat treatment quenching furnace, close the gas branch inspection valve, close the pulse control pneumatic valve, remove the connecting bolts connecting the fixed flange of the gas control valve group upstream of the gas pipeline and the universal connection flange 6, and check whether there is gas leakage in the direction of the gas control valve group;

[0027] After confirming that the environment is safe, remove the connecting bolts connecting the burner nozzle fixing flange and the universal connecting flange 6 at the downstream of the gas pipeline, check whether the gas branch pipe is blocked, and start the operation of reinstalling the metal bellows 1 if the pipeline is unobstructed;

[0028] Select a metal bellows 1 with appropriate specifications, install a metal graphite spiral wound gasket on the burner nozzle fixed flange, adjust the flange hole 7 of the universal connecting flange 6 to connect with the burner nozzle fixed flange, and fix it with connecting bolts;

[0029] Install the metal graphite spiral wound gasket on the fixed flange of the gas control valve group. The connecting flange of the gas control valve group is aligned with the flange hole 7 of the universal connecting flange 6 of the reinstalled metal bellows 1. Install the connecting bolts. Check that the asbestos sealing gasket 8, polychlorotetrafluoroethylene sealing gasket 9 and metal graphite spiral wound gasket between the universal connecting flange 6 are properly aligned, and then tighten the connecting bolts.

[0030] After the soft connection device is reinstalled, open the gas branch pipe inspection manual valve, open the pulse control pneumatic valve, check whether there is any gas leakage at the connection, and after confirming safety, the combustion system is put into normal use.

[0031] An embodiment of the present utility model is as follows:

[0032] The metal bellows 1 is made of 316 stainless steel, with a wall thickness of 1.8 mm, a diameter of DN32, and a length of 400 mm;

[0033] The corrosion-resistant inner coating 2 is a corrosion-resistant polychlorotetrafluoroethylene fused non-metallic anti-corrosion material, which is connected to the inner wall of the metal bellows 1 by a centrifugal casting process and has a thickness of 1 mm;

[0034] The metal wire braided protective layer 3 is braided with 0.1 mm metal wire;

[0035] The end sleeve 4 has a length of 30 mm, an outer diameter of 47 mm, an inner hole diameter of 38 mm, and an outer diameter of the annular protrusion 5 of 73 mm and a thickness of 8 mm;

[0036] The outer diameter of the universal connection flange 6 is 120 mm, the inner diameter is 40 mm, the thickness is 14 mm, and the diameter of the flange hole 7 is 14 mm;

[0037] Asbestos gasket 8 is a high temperature resistant medium pressure asbestos gasket with a thickness of 2 mm;

[0038] The polychlorotetrafluoroethylene gasket 9 is a corrosion-resistant polychlorotetrafluoroethylene gasket with a thickness of 1 mm.

Claims

1. A quick-disassembly and assembly soft connection device for the burner of a heat treatment quenching furnace. Features: The invention comprises a metal bellows (1), a corrosion-resistant inner coating (2), a metal wire braided protective layer (3), an end sleeve (4), a universal connection flange (6), an asbestos sealing gasket (8), and a polychlorotetrafluoroethylene sealing gasket (9). The corrosion-resistant inner coating (2) is coated on the inner wall of the metal bellows (1), the metal wire braided protective layer (3) is sleeved on the outer periphery of the metal bellows (1), the metal braided protective layer (3) and the metal bellows (1) are tightly matched, the end sleeve (4) is a circular ring, the front end of the circular ring of the end sleeve (4) is provided with an annular protrusion (5), the inner wall of the end sleeve (4) is in contact with the outer periphery of the metal bellows (1) and the metal The braided protective layer (3) is compressed and welded as a whole, the universal connection flange (6) is sleeved on the outer periphery of the end gland (4), the front end of the universal connection flange (6) is clamped on the rear part of the annular protrusion (5) at the front end of the end gland (4), and there is a gap of 1-2 mm between the inner hole of the universal connection flange (6) and the outer wall of the end gland (4), the universal connection flanges (6) at both ends of the metal bellows (1) are respectively connected to the connection flanges at both ends of the burner and the control valve group by bolts, and an asbestos sealing gasket (8) and a polychlorotetrafluoroethylene sealing gasket (9) are placed between the end face of the universal connection flange (6) and the end face of the connection flange of the burner and the control valve group.

2. The quickly disassembled and assembled soft connection device for the burner of the heat treatment quenching furnace according to claim 1, Features: The corrosion-resistant inner coating (2) is a fused-cast non-metallic anti-corrosion material, and the corrosion-resistant inner coating (2) is externally attached to the inner wall of the metal bellows (1) in the form of centrifugal fusion casting.

3. The quickly disassembled and assembled soft connection device for the burner of the heat treatment quenching furnace according to claim 1, Features: The inner wall of the metal bellows (1) is provided with gas fluid turbulence ripples (10), and the gas fluid turbulence ripples (10) are evenly arranged along the length direction of the metal bellows (1).

4. The quickly disassembled and assembled soft connection device for the burner of the heat treatment quenching furnace according to claim 1, Features: There is also a metal graphite wound gasket between the universal connecting flange (6) and the burner and control valve group connecting flange, and the metal graphite wound gasket is installed on the end surface of the burner and control valve group connecting flange.

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