Automatic pressure regulating and maintaining exhaust gas discharging system of nitriding furnace

Abstract

The utility model discloses a kind of automatic pressure-regulating pressure-maintaining waste gas discharge systems of nitriding furnace;Including waste gas pipeline, the gas inlet end of waste gas pipeline is connected with nitriding furnace, pressure sensor and electric valve are equipped on waste gas pipeline, electric valve and pressure sensor interlock control, first protection pipeline is connected on waste gas pipeline, two points of first protection pipeline are respectively located in the upstream and downstream of electric valve, pressure sensor is located between the gas inlet end of waste gas pipeline and the upstream connection point of first protection pipeline, dispersing valve is equipped on first protection pipeline.The utility model is equipped with pressure sensor and electric valve on waste gas pipeline, pressure sensor and electric valve interlock control, can realize the automatic regulation of furnace pressure, and the two ends of electric valve are connected with first protection pipeline, dispersing valve is equipped on first protection pipeline, when electric valve fails and hearth pressure reaches preset pressure, dispersing valve is automatically dispersed, can adjust hearth pressure, avoid hearth pressure too high.

Description

Technical Field

[0001] This utility model relates to the field of waste gas emission technology, and in particular to an automatic pressure regulating and pressure maintaining waste gas emission system for a nitriding furnace. Background Technology

[0002] Currently, most pressure regulating and holding valves in the exhaust gas emission systems of nitriding furnaces are of the counterweight type, with a counterweight block placed between the valve seat and the valve cover, as shown in the instruction manual. Figure 1 As shown, adjusting the furnace pressure requires removing the fastening connector 12, opening the valve cover 14 from the valve seat 13, and adjusting the weight or number of counterweights 15 in conjunction with the flow rate of the nitriding medium to obtain a suitable furnace pressure, thereby achieving the expected nitriding rate of the workpiece. The entire operation is cumbersome, and multiple adjustments may be necessary to obtain the appropriate furnace pressure. Furthermore, the high temperature of the exhaust gas poses a safety hazard. While some systems use electric valves for adjustment, these valves may fail in case of malfunction or power failure, leading to increased furnace pressure and potential production safety hazards. Therefore, an automatic pressure regulating and maintaining exhaust gas system for nitriding furnaces is urgently needed to solve these problems. Utility Model Content

[0003] To address the aforementioned problems, this utility model provides an automatic pressure regulating and maintaining exhaust gas system for a nitriding furnace, comprising an exhaust gas pipeline having an inlet end for connection to the nitriding furnace, a pressure sensor and an electric valve on the exhaust gas pipeline, the electric valve being interlocked with the pressure sensor, a first protective pipeline connected to the exhaust gas pipeline, the two connecting points of the first protective pipeline being located upstream and downstream of the electric valve respectively, the pressure sensor being located between the inlet end of the exhaust gas pipeline and the upstream connecting point of the first protective pipeline, and a vent valve on the first protective pipeline.

[0004] Furthermore, a second protective pipe is also connected to the exhaust gas pipe. The two connection points of the second protective pipe are located upstream and downstream of the electric valve, respectively. A manual valve is provided on the second protective pipe.

[0005] Furthermore, it also includes a controller, to which both the electric valve and the pressure sensor are electrically connected.

[0006] Furthermore, the exhaust gas pipeline is equipped with a first pressure switch for low-pressure early warning and a second pressure switch for high-pressure early warning. Both the first pressure switch and the second pressure switch are located between the pressure sensor and the upstream bypass point of the first protective pipeline.

[0007] Furthermore, at least a portion of the exhaust gas duct is a retractable flexible hose.

[0008] Furthermore, it also includes a burner, with the exhaust gas duct's outlet end connected to the burner.

[0009] Furthermore, the gas outlet of the burner is connected to a gas discharge pipe, and the gas inlet of the gas discharge pipe is provided with a collection cover covering the gas outlet of the burner.

[0010] Furthermore, the burner is connected to a gas pipeline, which is also connected to the ignition unit of the burner.

[0011] Furthermore, the gas pipeline is equipped with a regulating valve.

[0012] Furthermore, the ignition unit is connected to an ignition detection component.

[0013] By adopting the above technical solution, this utility model has the following beneficial effects compared with the prior art:

[0014] 1) The automatic pressure regulating and pressure maintaining exhaust gas system for nitriding furnace provided by this utility model has a pressure sensor and an electric valve on the exhaust gas pipeline. The pressure sensor and the electric valve are interlocked and controlled to realize the automatic adjustment of furnace pressure. The electric valve is connected to a first protective pipeline at both ends. The first protective pipeline is equipped with a vent valve. When the electric valve fails and the furnace pressure reaches the preset pressure, the vent valve automatically releases, which can adjust the furnace pressure and prevent the furnace pressure from being too high.

[0015] 2) The automatic pressure regulating and pressure maintaining exhaust gas system for nitriding furnace provided by this utility model has a second protective pipe connected to both ends of the electric valve. The second protective pipe is equipped with a manual valve. In the event that both the electric valve and the vent valve fail, the manual valve can be manually controlled to adjust the furnace pressure. Through multiple safety protections, the furnace pressure can be kept within the set range to ensure safe production. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the existing pressure regulating and holding exhaust gas emission system for nitriding furnaces;

[0018] Figure 2 This is a schematic diagram of the automatic pressure regulating and pressure maintaining exhaust gas emission system for the nitriding furnace of this utility model.

[0019] 1-Exhaust gas pipe; 11-Hose section; 2-Pressure sensor; 3-Electric valve; 4-First protective pipe; 41-Vent valve; 5-Second protective pipe; 51-Manual valve; 6-First pressure switch; 7-Second pressure switch; 8-Burner; 81-Gas emission pipe; 82-Collection hood; 83-Ignition unit; 84-Ignition burner; 85-Ignition detection assembly; 9-Gas pipe; 91-Gas main pipe; 92-First gas branch pipe; 93-Second gas branch pipe; 94-Third pressure switch; 95-Second pressure gauge; 96-First gas valve; 97-Second gas valve; 98-Third gas valve; 10-First pressure gauge; 12-Fastening connector; 13-Valve seat; 14-Valve cover; 15-Counterweight. Detailed Implementation

[0020] 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, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model. In the accompanying drawings, the dimensions and relative dimensions of certain parts may be enlarged for clarity.

[0021] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connection" and "connected" should be interpreted broadly. For example, they can be fixed connections, detachable connections, or integral connections; they can be mechanical connections or electrical connections; they can be direct connections or indirect connections through an intermediate medium; they can be internal connections between two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0022] In the description of this utility model, the terms "upper", "lower", "left", "right", "front", "back", "center", "horizontal", "vertical", "top", "bottom", "inner", and "outer" are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of description and simplification of operation, 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, they should not be construed as limitations on this utility model.

[0023] Furthermore, in the description of this utility model, the terms "first" and "second" are used merely for descriptive distinction and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Additionally, features defined with "first" and "second" may explicitly or implicitly include one or more of that feature.

[0024] As per the instruction manual Figure 2 As shown, this utility model provides an automatic pressure regulating and maintaining exhaust gas emission system for a nitriding furnace, including an exhaust gas pipeline 1. The exhaust gas pipeline 1 has an inlet end for connecting to the nitriding furnace. A pressure sensor 2 and an electric valve 3 are installed on the exhaust gas pipeline 1. The electric valve 3 is interlocked with the pressure sensor 2. A first protective pipeline 4 is connected to the exhaust gas pipeline 1. The two connection points of the first protective pipeline 4 are located upstream and downstream of the electric valve 3, respectively. The pressure sensor 2 is located between the inlet end of the exhaust gas pipeline 1 and the upstream connection point of the first protective pipeline 4. A vent valve 41 is installed on the first protective pipeline 4. In this embodiment, "upstream" refers to the side of the electric valve 3 closest to the inlet end of the exhaust gas pipeline 1, and "downstream" refers to the side of the electric valve 3 furthest from the inlet end of the exhaust gas pipeline 1.

[0025] Specifically, the exhaust gas pipe 1 is connected to the nitriding furnace and is used to discharge the exhaust gas from the nitriding furnace. The furnace pressure is regulated by adjusting the gas flow rate through the exhaust gas pipe 1, ensuring that the furnace pressure remains within a set range and preventing excessive furnace pressure that could affect the safe operation of the nitriding furnace. The pressure sensor 2 monitors the pressure of the exhaust gas pipe 1 in real time. The electric valve 3 adjusts its opening based on the pressure data monitored by the pressure sensor 2 to regulate the gas flow rate through the exhaust gas pipe 1, thereby ensuring that the furnace pressure remains within the set range and achieving automatic furnace pressure adjustment. Once the furnace pressure reaches the set range, the electric valve 3 stops rotating and maintains its current opening, allowing the nitriding furnace to operate under stable furnace pressure. To prevent accidental malfunction of the electric valve 3 from causing an increase in furnace pressure and posing a safety hazard, a first protective pipe 4 is connected to the exhaust gas pipe 1. The first protective pipe 4 is equipped with a vent valve 41. Under normal circumstances, the vent valve 41 is closed, and the exhaust gas is discharged through the electric valve 3. When the electric valve 3 malfunctions and the furnace pressure reaches the preset pressure, the vent valve 41 automatically releases the pressure. The furnace pressure can be adjusted through the vent valve 41.

[0026] In an optimized implementation, a second protective pipe 5 is also connected to the exhaust gas pipe 1. The two connection points of the second protective pipe 5 are located upstream and downstream of the electric valve 3, respectively. A manual valve 51 is provided on the second protective pipe 5. In the event that both the electric valve 3 and the venting valve 41 fail, the furnace pressure can be adjusted by venting through the manual valve 51.

[0027] Preferably, the pressure sensor 2 has high and low pressure early warning functions. In the event of a high pressure warning, the pressure is preferentially regulated by the electric valve 3. If the electric valve 3 fails, the pressure is regulated by the vent valve 41. If both the electric valve 3 and the vent valve 41 fail, the pressure is regulated by the manual valve 51. Through these multiple adjustments, multiple safety protections can be achieved, ensuring the safe operation of the nitriding furnace.

[0028] The optimized implementation also includes a controller, with both the electric valve 3 and the pressure sensor 2 electrically connected to the controller. The electric valve 3 is preferably an analog input / output electric valve, capable of precisely controlling its opening by receiving continuously changing analog electrical signals. The controller is preferably a PLC controller. The pressure sensor 2 outputs the real-time pressure of the exhaust gas to the PLC controller. The electric valve 3 can receive a 4-20mA signal based on a set furnace pressure value to adjust its opening, and then outputs the opening signal back to the PLC controller as an analog signal. Based on a PID program, the PLC controller automatically adjusts the furnace pressure to within the allowable range, thus achieving automatic furnace pressure regulation.

[0029] In an optimized implementation, the exhaust gas pipeline 1 is equipped with a first pressure switch 6 for low-pressure early warning and a second pressure switch 7 for high-pressure early warning. Both the first pressure switch 6 and the second pressure switch 7 are located between the pressure sensor 2 and the upstream bypass point of the first protective pipeline 4. To further monitor and provide early warning of exhaust gas pressure, the first pressure switch 6 and the second pressure switch 7 on the exhaust gas pipeline 1 can provide low-pressure and high-pressure early warnings respectively, further ensuring production safety.

[0030] Preferably, the exhaust gas pipeline 1 is further provided with a first pressure gauge 10 for displaying the exhaust gas pressure.

[0031] In an optimized implementation, at least a portion of the exhaust gas duct 1 is a flexible hose section 11. The flexible hose section 11 has a certain allowance for expansion and contraction to accommodate the thermal expansion and contraction of the exhaust gas duct 1.

[0032] The optimized implementation also includes a burner 8, with the outlet end of the exhaust gas pipe 1 connected to the burner 8. The burner 8 is preferably an annular burner, which can burn the exhaust gas to obtain compliant gas for emission.

[0033] In an optimized implementation, the outlet end of the burner 8 is connected to a gas emission pipe 81, and the inlet end of the gas emission pipe 81 is provided with a collection hood 82 covering the outlet end of the burner 8. The burner 8 effectively and completely combusts the exhaust gas discharged from the exhaust pipe 1, ensuring that the exhaust gas discharged outdoors from the collection hood 82 and the gas emission pipe 81 meets environmental protection requirements.

[0034] In an optimized implementation, the burner 8 is connected to a gas pipeline 9, which is also connected to the ignition unit 83 of the burner. The gas pipeline 9 includes a main gas pipe 91, a first gas branch pipe 92, and a second gas branch pipe 93. The first gas branch pipe 92 and the second gas branch pipe 93 are connected to the main gas pipe 91. The first gas branch pipe 92 is connected to the burner 8, and the second gas branch pipe 93 is connected to the ignition unit 83, providing fuel to both the burner 8 and the ignition unit 83. An ignition burner 84 on the ignition unit 83 is used to ignite the burner 8.

[0035] In an optimized implementation, the gas pipeline 9 is equipped with a regulating valve. Specifically, the main gas pipe 91 is equipped with a third pressure switch 94, a second pressure gauge 95, and a first gas valve 96. The first gas valve 96 is preferably a manual valve, which can monitor and regulate the pressure and flow rate of the natural gas in the main gas pipe to ensure a sufficient supply of natural gas to the burner. The first gas branch pipe 92 is equipped with a second gas valve 97, which includes one manual valve and two solenoid valves, and can regulate the flow rate of the natural gas in the first gas branch pipe while ensuring accurate regulation. The second gas branch pipe 93 is equipped with a third gas valve 98, which includes one manual valve and two solenoid valves, and can regulate the flow rate of the natural gas in the second gas branch pipe 93 while ensuring accurate regulation.

[0036] In an optimized implementation, the ignition unit 83 is connected to an ignition detection component 85, which is used to monitor the ignition status and detect the presence and stability of the flame through sensors to ensure the normal operation of the burner 8.

[0037] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0038] Those skilled in the art will understand that this invention can be implemented in many other specific forms without departing from the spirit and scope of this invention. Although embodiments of this invention have been described, it should be understood that this invention is not limited to these embodiments, and those skilled in the art can make changes and modifications within the spirit and scope of this invention as defined in the appended claims.

Claims

1. An automatic pressure regulating and maintaining exhaust gas system for a nitriding furnace, comprising an exhaust gas pipeline, wherein the inlet end of the exhaust gas pipeline is connected to the nitriding furnace, characterized in that, The exhaust gas pipeline is equipped with a pressure sensor and an electric valve. The electric valve is interlocked with the pressure sensor. A first protective pipeline is connected to the exhaust gas pipeline. The two connection points of the first protective pipeline are located upstream and downstream of the electric valve, respectively. The pressure sensor is located between the inlet end of the exhaust gas pipeline and the upstream connection point of the first protective pipeline. A vent valve is provided on the first protective pipeline.

2. The automatic pressure regulating and maintaining exhaust gas system for nitriding furnaces according to claim 1, characterized in that, The exhaust gas pipeline is also connected to a second protective pipeline. The two connection points of the second protective pipeline are located upstream and downstream of the electric valve, respectively. The second protective pipeline is equipped with a manual valve.

3. The automatic pressure regulating and maintaining exhaust gas system for nitriding furnaces according to claim 1, characterized in that, It also includes a controller, to which both the electric valve and the pressure sensor are electrically connected.

4. The automatic pressure regulating and maintaining exhaust gas system for nitriding furnaces according to claim 1, characterized in that, The exhaust gas pipeline is equipped with a first pressure switch that can provide low-pressure early warning and a second pressure switch that can provide high-pressure early warning. Both the first pressure switch and the second pressure switch are located between the pressure sensor and the upstream bypass point of the first protective pipeline.

5. The automatic pressure regulating and maintaining exhaust gas system for nitriding furnaces according to claim 1, characterized in that, At least a portion of the exhaust gas duct is a retractable flexible hose.

6. The automatic pressure regulating and maintaining exhaust gas system for nitriding furnaces according to claim 1, characterized in that, It also includes a burner, and the outlet end of the exhaust gas pipe is connected to the burner.

7. The automatic pressure regulating and maintaining exhaust gas system for nitriding furnaces according to claim 6, characterized in that, The burner's outlet end is connected to a gas discharge pipe, and the gas discharge pipe's inlet end is equipped with a collection cover that covers the burner's outlet end.

8. The automatic pressure regulating and maintaining exhaust gas system for nitriding furnaces according to claim 6, characterized in that, The burner is connected to a gas pipeline, and the gas pipeline is also connected to the ignition unit of the burner.

9. The automatic pressure regulating and maintaining exhaust gas system for nitriding furnaces according to claim 8, characterized in that, The gas pipeline is equipped with a regulating valve.

10. The automatic pressure regulating and maintaining exhaust gas system for a nitriding furnace according to claim 8, characterized in that, The ignition unit is connected to an ignition detection component.

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