Optimized exhaust structure of nitriding furnace

Abstract

This utility model discloses an optimized exhaust structure for a nitriding furnace, belonging to the technical field of nitriding furnaces. Key technical features include a nitriding furnace with a pretreatment mechanism on its right side. The pretreatment mechanism has a detachable filter screen mechanism movably connected to its inner side. When exhaust gas is discharged, it is not simply discharged through a long exhaust pipe or left to be discharged later. Instead, it performs timely exhaust gas pretreatment when exhaust gas is generated, prioritizing the discharge of easily cleanable exhaust gas and collecting difficult-to-clean exhaust gas. By integrating spraying, filtration, and adsorption into a single pretreatment structure, the exhaust gas from the nitriding furnace can be treated more comprehensively, and resources can be recovered. Wastewater can be subsequently treated and reused, and the exhaust gas can be further separated into effective and harmful gases for reuse. The characteristic adsorption plates inside the gas collection box can be easily replaced without opening the entire gas collection box.

Description

Technical Field

[0001] This utility model relates to the field of nitriding furnace technology, and in particular to an optimized exhaust structure for a nitriding furnace. Background Technology

[0002] The low-vacuum variable pressure pulse nitriding furnace is developed based on traditional nitriding technology. Traditional nitriding processes suffer from problems such as slow nitriding speed, high energy consumption, and unstable quality. Its unique exhaust method can quickly and effectively remove air and impurity gases from the furnace, overcoming the shortcomings of traditional methods and improving nitriding efficiency and quality. This is achieved through precise control of parameters such as furnace pressure and atmosphere, which can significantly shorten the nitriding cycle, reduce energy consumption, improve the uniformity and hardness of the nitrided layer, optimize the surface properties of the workpiece, and improve the overall product quality and production efficiency. It has important significance in the field of metal surface treatment, promotes the technological innovation and development of nitriding processes, and meets the needs of modern industry for high-quality and high-efficiency metal processing.

[0003] In the existing technology, nitriding furnaces are generally equipped with a cover on the top, and the furnace body has a certain depth, which makes it very inconvenient to pick up and put down the workpiece. In addition, during the nitriding operation, the temperature inside the furnace is affected by the voltage difference between the furnace body and the workpiece. The magnitude of the voltage difference is controlled by the voltage difference of the DC power supply and cannot be adjusted, thus making it impossible to flexibly control the temperature inside the furnace.

[0004] To address the aforementioned issues, an existing patent (publication number: CN215517600U) proposes an optimized exhaust structure for a nitriding furnace. This system uses a synchronous electric push rod to raise and lower the furnace body. A pulsed DC power supply applies negative and positive voltages to the cathode support plate and the anode metal cylinder, respectively. The pulse frequency of the pulsed DC power supply is adjusted by a PLC controller. The advantages of this invention are that the furnace body and base plate are separated, and the furnace body is raised and lowered via a synchronous electric push rod, making it easier to pick up and place workpieces. During production, the pulsed DC power supply applies a negative and positive voltage difference to the cathode support plate and the anode metal cylinder, respectively, thereby ionizing nitrogen and initiating the nitriding reaction. During this process, the pulse frequency of the pulsed DC power supply can be adjusted according to the temperature inside the furnace, thus regulating the heating power and allowing for flexible temperature control within the furnace. This invention is suitable for metal surface treatment.

[0005] To address the aforementioned issues, existing patents offer solutions. However, during nitriding furnace operation, the furnace pressure needs to be frequently adjusted using a vacuum pump. During this adjustment process, the generated exhaust gas is also drawn out and transferred via an external vacuum pipe. The exhaust gas is either simply treated before being discharged or requires centralized treatment, resulting in a long retention time. The former causes environmental pollution, while the latter can corrode equipment over a long period and leads to a certain degree of resource waste due to the inability to recycle beneficial substances.

[0006] Therefore, an optimized exhaust structure for the nitriding furnace is proposed. Utility Model Content

[0007] The purpose of this invention is to provide an optimized exhaust structure for a nitriding furnace, which can solve the problems of environmental pollution, resource waste, and equipment damage caused by the lack of pretreatment and effective material recovery in existing exhaust emissions.

[0008] To achieve the above objectives, the present invention provides the following technical solution: an optimized exhaust structure for a nitriding furnace, comprising a nitriding furnace, wherein a pretreatment mechanism is provided on the right side of the nitriding furnace, and a detachable filter screen mechanism is movably connected to the inner side of the pretreatment mechanism;

[0009] The pretreatment mechanism includes a gas collection box, a liquid cleaning collection component, a filter gas collection and discharge component, and a collection tank. The gas collection box is located on the right side of the nitriding furnace. The liquid cleaning collection component is movably connected to the inside of the gas collection box. The filter gas collection and discharge component is movably connected to the inside of the gas collection box. The collection tank is movably connected to the rear side of the liquid cleaning collection component and the filter gas collection and discharge component.

[0010] Preferably, a mounting base is fixedly connected to the bottom of the inner side of the gas collection box, a filter plate frame is slidably connected to the inner side of the gas collection box, and a feature adsorption plate is movably connected to the inner side of the filter plate frame.

[0011] Preferably, a positioning block is fixedly connected to the bottom of the filter plate frame, the positioning block is movably connected to the inner side of the top of the mounting base, and a connecting plate is fixedly connected to the top of the filter plate frame.

[0012] Preferably, a sealing block is fixedly connected to the bottom of the linkage plate, and a sealing groove is provided on the top of the air collection box, with the sealing block movably connected to the inner side of the sealing groove.

[0013] Preferably, a liquid storage tank is fixedly connected to both the front and rear sides of the gas collection box, a first liquid pump is fixedly connected to the top of the liquid storage tank, a water supply pipe is movably connected to the inner side of the first liquid pump, a mixing tank is movably connected to the outer side of the top water supply pipe, and an electric stirring blade is movably connected to the inner side of the mixing tank.

[0014] Preferably, a temperature-controlled heating plate is fixedly connected to the inner side of the mixing tank, a second liquid pump is fixedly connected to the bottom of the mixing tank, the bottom water pipe is movably connected to the inner side of the second liquid pump and the gas collection box, an electric pressure nozzle is movably connected to the bottom of the second liquid pump, a corrosion-resistant water pump is fixedly connected to the rear side of the inner side of the gas collection box, a liquid delivery pipe is movably connected to the inner side of the corrosion-resistant water pump, and the left collection tank is fixedly connected to the outer side of the liquid delivery pipe.

[0015] Preferably, an air pump is fixedly connected to the rear side of the inner side of the air collection box. The air pump is located to the right of the corrosion-resistant water pump. An air supply pipe is movably connected to the inner side of the air pump, and the right-side collection tank is fixedly connected to the outer side of the air supply pipe.

[0016] Preferably, a three-way valve is fixedly connected to the inner side of the gas transmission pipe, a sensing valve is fixedly connected to the inner side of the three-way valve, and a gas quality monitor is fixedly connected to the inner side of the three-way valve.

[0017] Preferably, a supporting frame is fixedly connected to the outside of the collection tank.

[0018] Preferably, a vacuum pump is movably connected to the outside of the nitriding furnace, and an inlet pipe is movably connected to the inside of the vacuum pump. The inlet pipe is movably connected to the left side of the inside of the gas collecting box, and the electric pressurizing nozzle is located at the top of the inlet pipe.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] 1. This application, by setting up a pretreatment mechanism, avoids simply treating and discharging exhaust gas through a lengthy exhaust pipe or storing it for later discharge when the exhaust gas is transferred out. Instead, it performs timely exhaust gas pretreatment when the exhaust gas is generated, prioritizing the discharge of exhaust gas that can be easily cleaned and collecting exhaust gas that is difficult to clean. By integrating spraying, filtration, and adsorption into a whole pretreatment structure, the exhaust gas of the nitriding furnace can be treated more comprehensively, and resources can be recovered. Wastewater can be treated and reused, and the exhaust gas can be further separated into effective gases and harmful gases for reuse.

[0021] 2. This application, by setting a detachable filter screen mechanism, allows for convenient replacement of the characteristic adsorption plates inside the gas collection box without opening the entire gas collection box. The characteristic adsorption plates can be replaced with different adsorption plates for different treatment objects, such as carbon filter plates, sticky filter screens, chemical adsorption plates, etc., and damaged adsorption plates can also be replaced. Furthermore, the gas collection box can be kept in a sealed state when closed. Attached Figure Description

[0022] Figure 1 The overall structural diagram of the optimized exhaust structure of the nitriding furnace of this utility model;

[0023] Figure 2 This is an overall structural diagram of the pretreatment mechanism of this utility model;

[0024] Figure 3 This is an overall structural diagram of the liquid cleaning and collection assembly of this utility model;

[0025] Figure 4 This is an overall structural diagram of the gas collection and emission assembly of this utility model;

[0026] Figure 5 This is an overall structural diagram of the detachable filter screen mechanism of this utility model.

[0027] In the diagram: 1. Nitriding furnace; 2. Pretreatment mechanism; 21. Gas collection box; 22. Liquid cleaning collection assembly; 22a. Storage tank; 22b. First liquid pump; 22c. Water supply pipe; 22d. Mixing tank; 22e. Electric stirring blade; 22f. Temperature-controlled heating plate; 22g. Second liquid pump; 22h. Electric pressurizing nozzle; 22i. Corrosion-resistant water pump; 22j. Liquid supply pipe; 23. Filter gas collection and discharge assembly; 23a. Air pump; 23b. Gas supply pipe; 23c. T-connector; 23d. Sensing valve; 23e. Gas quality monitor; 24. Collection tank; 3. Detachable filter screen mechanism; 31. Mounting base; 32. Filter plate frame; 33. Feature adsorption plate; 34. Positioning block; 35. Linkage plate; 36. Sealing block; 37. Sealing groove; 4. Support frame; 5. Vacuum pump; 6. Gas inlet pipe. Detailed Implementation

[0028] 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.

[0029] Please see Figure 1-5 The present invention provides the following technical solution:

[0030] An optimized exhaust structure for a nitriding furnace includes a nitriding furnace 1, a pretreatment mechanism 2 on the right side of the nitriding furnace 1, and a detachable filter screen mechanism 3 movably connected to the inner side of the pretreatment mechanism 2.

[0031] The pretreatment unit 2 includes a gas collection box 21, a liquid cleaning collection component 22, a filter gas collection and discharge component 23, and a collection tank 24. The gas collection box 21 is located on the right side of the nitriding furnace 1. The liquid cleaning collection component 22 is movably connected to the inside of the gas collection box 21. The filter gas collection and discharge component 23 is movably connected to the inside of the gas collection box 21. The collection tank 24 is movably connected to the rear side of the liquid cleaning collection component 22 and the filter gas collection and discharge component 23.

[0032] In this embodiment: by setting up the gas collection box 21, the exhaust gas extracted from the furnace by the vacuum pump 5 can be pre-treated in a timely manner. The exhaust gas is sprayed and cleaned by the liquid cleaning collection component 22 and the filter gas collection and discharge component 23, and the wastewater is collected. The filtered gas is evaluated and discharged or collected.

[0033] Specifically, such as Figure 1 , Figure 2 , Figure 5 As shown, a mounting base 31 is fixedly connected to the bottom of the inner side of the gas collection box 21, a filter plate frame 32 is slidably connected to the inner side of the gas collection box 21, and a feature adsorption plate 33 is movably connected to the inner side of the filter plate frame 32.

[0034] Specifically, such as Figure 1 , Figure 2 , Figure 5 As shown, a positioning block 34 is fixedly connected to the bottom of the filter plate frame 32, and the positioning block 34 is movably connected to the inner side of the top of the mounting base 31. A connecting plate 35 is fixedly connected to the top of the filter plate frame 32.

[0035] Specifically, such as Figure 1 , Figure 2 , Figure 5 As shown, a sealing block 36 is fixedly connected to the bottom of the linkage plate 35, and a sealing groove 37 is provided on the top of the air collection box 21. The sealing block 36 is movably connected to the inner side of the sealing groove 37.

[0036] In this embodiment: guided by the vacuum pump 5 and the pressure difference between the exhaust gas and clean air, the exhaust gas passes to the right through three characteristic adsorption plates 33, including a carbon filter plate for adsorbing organic pollutants, a sticky plate for adsorbing dust, and a chemical plate for adsorbing harmful chemical substances. After the filtered gas passes through, a second round of multi-stage filtration and screening is performed. When the characteristic adsorption plate 33 is damaged or the adsorption efficiency is low, the filter plate frame 32 is pulled out and replaced via the linkage plate 35. The new frame slides downward along the groove, so that the positioning block 34 is inserted into the mounting base 31 and the sealing block 36 fits into the sealing groove 37, achieving quick replacement.

[0037] Specifically, such as Figure 2 , Figure 3 As shown, a liquid storage tank 22a is fixedly connected to both the front and rear sides of the gas collection box 21. A first liquid pump 22b is fixedly connected to the top of the liquid storage tank 22a. A water supply pipe 22c is movably connected to the inner side of the first liquid pump 22b. A mixing tank 22d is movably connected to the outer side of the top water supply pipe 22c. An electric stirring blade 22e is movably connected to the inner side of the mixing tank 22d.

[0038] Specifically, such as Figure 2 , Figure 3 As shown, a temperature-controlled heating plate 22f is fixedly connected to the inner side of the mixing tank 22d, a second liquid pump 22g is fixedly connected to the bottom of the mixing tank 22d, a bottom water pipe 22c is movably connected to the inner side of the second liquid pump 22g and the gas collection box 21, an electric pressure nozzle 22h is movably connected to the bottom of the second liquid pump 22g, a corrosion-resistant water pump 22i is fixedly connected to the rear side of the inner side of the gas collection box 21, a liquid delivery pipe 22j is movably connected to the inner side of the corrosion-resistant water pump 22i, and a left-side collection tank 24 is fixedly connected to the outer side of the liquid delivery pipe 22j.

[0039] In this embodiment: exhaust gas and air are introduced into the inside of the gas collection box 21 through the air inlet pipe 6. After the exhaust gas enters, the electric pressurizing nozzle 22h at the top of the air inlet opening draws clean water, chemical liquid and other raw liquids from the storage tanks 22a on both sides through the first liquid pump 22b. The raw liquids are sent to the mixing tank 22d through the water pipe 22c, mixed by the electric stirring blade 22e and the temperature is adjusted by the temperature control heating plate 22f. Then, the second liquid pump 22g draws the raw liquids and sends them to the electric pressurizing nozzle 22h. The nozzle can rotate and adjust the pressure autonomously. When the exhaust gas enters the gas collection box 21, a chemical liquid water curtain is formed to filter and clean the exhaust gas impurities and harmful substances in the first round. The mixed wastewater is collected into the left collection tank 24 by the bottom corrosion-resistant water pump 22i.

[0040] Specifically, such as Figure 2 , Figure 4 As shown, an air pump 23a is fixedly connected to the rear side of the inner side of the air collection box 21. The air pump 23a is located to the right of the corrosion-resistant water pump 22i. An air supply pipe 23b is movably connected to the inner side of the air pump 23a. The right-side collection tank 24 is fixedly connected to the outer side of the air supply pipe 23b.

[0041] Specifically, such as Figure 2 , Figure 4 As shown, a three-way pipe 23c is fixedly connected to the inside of the gas transmission pipe 23b, a sensing valve 23d is fixedly connected to the inside of the three-way pipe 23c, and a gas quality monitor 23e is fixedly connected to the inside of the three-way pipe 23c.

[0042] In this embodiment: the gas at the top right side of the gas collection box 21 is drawn into the gas delivery pipe 23b by the air pump 23a. When the filtered gas is transferred to the three-way pipe 23c in the gas delivery pipe 23b, the gas quality monitor 23e monitors its average quality and opens the corresponding sensing valve 23d. If the quality is good, the top sensing valve 23d is opened for discharge. If the quality is not up to standard, the sensing valve 23d inside the gas delivery pipe 23b is opened to allow it to enter the collection tank 24 and be transferred to the waste gas treatment equipment with stronger treatment capacity, thereby completing the waste gas pretreatment.

[0043] Specifically, such as Figure 1 As shown, a support frame 4 is fixedly connected to the outside of the collection tank 24.

[0044] Specifically, such as Figure 1 As shown, a vacuum pump 5 is movably connected to the outside of the nitriding furnace 1, and an inlet pipe 6 is movably connected to the inside of the vacuum pump 5. The inlet pipe 6 is movably connected to the left side of the inside of the gas collection box 21, and an electric pressurizing nozzle 22h is set at the top of the inlet pipe 6.

[0045] In this example: the collection tank 24 can be supported by the support frame 4, and the nitriding operation can be carried out by the vacuum pump 5 and the exhaust gas can be extracted and transported to the gas collection box 21 through the gas inlet pipe 6.

[0046] Working principle: During nitriding in nitriding furnace 1, vacuum pump 5 repeatedly extracts air and waste gas from the furnace. The waste gas and air are directly guided to the inside of gas collection box 21 via inlet pipe 6. After the waste gas enters gas collection box 21, an electric pressurizing nozzle 22h is installed at the top of the inlet opening. The first liquid pump 22b extracts raw liquid from the two side storage tanks 22a. The raw liquid includes cleaning water, chemical liquid, etc., and is then transported to mixing tank 22d via water pipe 22c. It is then mixed by electric stirring blades 22e and temperature controlled. After the heating plate 22f is heated to the desired temperature, it is then pumped and transported to the electric pressurized nozzle 22h by the second pump 22g. This nozzle can rotate and adjust its pressure autonomously. When the exhaust gas enters the gas collection box 21, it forms a chemical liquid water curtain to perform the first round of filtration and cleaning of impurities and harmful substances in the exhaust gas. The mixed wastewater is collected by the corrosion-resistant pump 22i at the bottom and enters the collection tank 24 on the left. Then, due to the guiding force of the vacuum pump 5 and the pressure difference between the exhaust gas and clean air, the exhaust gas is guided to the right and passes through three characteristic adsorption plates 33. The characteristic adsorption plates 33 mainly include adsorption... The filter includes carbon filter plates for adsorbing organic pollutants, adhesive plates for adsorbing dust, and chemical plates for adsorbing harmful chemicals, among other characteristic adsorption plates 33. After passing through these characteristic adsorption plates 33, the filtered gas undergoes a second round of multi-stage filtration. Upon reaching the right side of the gas collection box 21, it is extracted from the top right side of the gas collection box 21 by a vacuum pump 23a and drawn into the gas delivery pipe 23b. When the filtered gas is transferred from the gas delivery pipe 23b to the three-way pipe 23c, the gas quality monitor 23e monitors the average quality of the filtered gas inside the gas delivery pipe 23b, thereby opening the corresponding sensing valve 23d. When the quality is good... When directly discharged, the top sensing valve 23d will be opened for discharge. When the quality is unqualified, the sensing valve 23d inside the gas supply pipe 23b will be opened to allow the gas to enter the collection tank 24 for transfer to a more powerful waste gas treatment device, thereby completing the pretreatment of the waste gas. When the characteristic adsorption plate 33 is damaged or the adsorption efficiency is poor, the filter plate frame 32 can be pulled out by the linkage plate 35 for replacement. The new filter plate frame 32 is then moved downward along the slide groove, so that the positioning block 34 is inserted into the inner side of the mounting base 31 and the sealing block 36 fits into the sealing groove 37, thereby achieving quick replacement.

[0047] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A nitrogenation furnace optimized exhaust structure, comprising a nitriding furnace (1), characterized in that: A pretreatment mechanism (2) is provided on the right side of the nitriding furnace (1), and a detachable filter screen mechanism (3) is movably connected to the inner side of the pretreatment mechanism (2). The pretreatment mechanism (2) includes a gas collection box (21), a liquid cleaning collection component (22), a filter gas collection and discharge component (23), and a collection tank (24). The gas collection box (21) is located on the right side of the nitriding furnace (1). The liquid cleaning collection component (22) is movably connected to the inside of the gas collection box (21). The filter gas collection and discharge component (23) is movably connected to the inside of the gas collection box (21). The collection tank (24) is movably connected to the rear side of the liquid cleaning collection component (22) and the filter gas collection and discharge component (23).

2. The optimized exhaust structure of a nitriding furnace according to claim 1, wherein: The bottom of the gas collection box (21) is fixedly connected to the mounting base (31), the inside of the gas collection box (21) is slidably connected to the filter plate frame (32), and the inside of the filter plate frame (32) is movably connected to the feature adsorption plate (33).

3. The optimized exhaust structure of a nitriding furnace according to claim 2, wherein: The bottom of the filter plate frame (32) is fixedly connected to a positioning block (34), which is movably connected to the inner side of the top of the mounting base (31). The top of the filter plate frame (32) is fixedly connected to a connecting plate (35).

4. The optimized exhaust structure of a nitriding furnace according to claim 3, wherein: A sealing block (36) is fixedly connected to the bottom of the linkage plate (35), and a sealing groove (37) is opened on the top of the air collection box (21). The sealing block (36) is movably connected to the inside of the sealing groove (37).

5. The optimized exhaust structure for a nitriding furnace according to claim 1, characterized in that: The gas collection box (21) is fixedly connected to a liquid storage tank (22a) on both the front and rear sides. A first liquid pump (22b) is fixedly connected to the top of the liquid storage tank (22a). A water supply pipe (22c) is movably connected to the inner side of the first liquid pump (22b). A mixing tank (22d) is movably connected to the outer side of the top water supply pipe (22c). An electric stirring blade (22e) is movably connected to the inner side of the mixing tank (22d).

6. The optimized exhaust structure of a nitriding furnace according to claim 5, wherein: A temperature-controlled heating plate (22f) is fixedly connected to the inner side of the mixing tank (22d). A second liquid pump (22g) is fixedly connected to the bottom of the mixing tank (22d). The water supply pipe (22c) at the bottom is movably connected to the inner side of the second liquid pump (22g) and the gas collection box (21). An electric pressure nozzle (22h) is movably connected to the bottom of the second liquid pump (22g). A corrosion-resistant water pump (22i) is fixedly connected to the rear side of the inner side of the gas collection box (21). A liquid supply pipe (22j) is movably connected to the inner side of the corrosion-resistant water pump (22i). The left collection tank (24) is fixedly connected to the outside of the liquid supply pipe (22j).

7. The optimized exhaust structure of a nitriding furnace according to claim 6, wherein: An air pump (23a) is fixedly connected to the rear side of the inner side of the gas collection box (21). The air pump (23a) is located on the right side of the corrosion-resistant water pump (22i). An air supply pipe (23b) is movably connected to the inner side of the air pump (23a). The right-side collection tank (24) is fixedly connected to the outer side of the air supply pipe (23b).

8. The optimized exhaust structure of a nitriding furnace according to claim 7, wherein: A three-way pipe (23c) is fixedly connected to the inside of the gas transmission pipe (23b), a sensing valve (23d) is fixedly connected to the inside of the three-way pipe (23c), and a gas quality monitor (23e) is fixedly connected to the inside of the three-way pipe (23c).

9. The optimized exhaust structure of a nitriding furnace according to claim 1, wherein: The outer side of the collection tank (24) is fixedly connected to a support frame (4).

10. The optimized exhaust structure of a nitriding furnace according to claim 6, wherein: A vacuum pump (5) is movably connected to the outside of the nitriding furnace (1), and an air inlet pipe (6) is movably connected to the inside of the vacuum pump (5). The air inlet pipe (6) is movably connected to the left side of the inside of the gas collection box (21), and the electric pressurizing nozzle (22h) is located at the top of the air inlet pipe (6).

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