Gas flow guiding device of gas nitriding furnace

Abstract

The utility model relates to the technical field of gas nitriding furnaces, in particular to a gas flow guiding device of a gas nitriding furnace, which comprises a furnace tank, a furnace cover is detachably connected to the upper end of the furnace tank, a plurality of placing plates which are uniformly distributed up and down are arranged in the furnace tank, and the outer wall of the furnace tank is communicated with a connecting pipe. The lower end of the furnace tank is fixedly connected with an air storage cylinder with the upper side of an opening structure, air pumps are arranged on the left side and the right side of the air storage cylinder correspondingly, and bent pipes communicating with the interior of the furnace tank are installed at the air inlet ends of the two air pumps correspondingly; when gas flows in the furnace tank, the gas can penetrate through the plurality of placing plates and is in contact with a workpiece, and the gas in the gas storage cylinder can be dispersed and discharged into the furnace tank through the plurality of gas outlet nozzles, so that the purposes of improving the uniformity of contact between the gas and the workpiece and improving the nitriding effect of the workpiece are achieved; and the gas circularly flows in the furnace tank, so that the staying time of the gas in the furnace tank is prolonged, and the purpose of improving the utilization rate of the ammonia gas is achieved.

Description

Technical Field

[0001] This utility model relates to the field of gas nitriding furnace technology, specifically to a gas nitriding furnace airflow guiding device. Background Technology

[0002] Currently, the working process of a nitriding furnace is as follows: the workpiece is placed inside the furnace, and then ammonia gas is directly fed into the nitriding furnace. The ammonia gas is decomposed into nitrogen and hydrogen in an atomic state to perform nitriding treatment on the workpiece. This can give the surface of the nitrided workpiece a nitrogen-containing reinforced layer, resulting in high hardness, high wear resistance, high fatigue limit, and good wear resistance.

[0003] In the existing technology, when nitriding a workpiece, new ammonia gas is introduced into the furnace while the gas produced by the reaction and the unreacted ammonia gas are discharged from the furnace. The ammonia gas has a short residence time in the furnace, which means that the ammonia gas cannot be fully utilized. Furthermore, the gas is not dispersed, resulting in poor uniformity of gas-workpiece contact and affecting the nitriding effect. Therefore, it is necessary to propose a gas flow guiding device for a gas nitriding furnace to solve the above problems. Utility Model Content

[0004] The purpose of this utility model is to provide a gas flow guiding device for a gas nitriding furnace, which facilitates the flow of gas and allows it to circulate within the furnace, thereby improving the utilization rate of ammonia; and also facilitates the dispersion of gas, improving the uniformity of gas-workpiece contact, thereby enhancing the nitriding effect of the workpiece.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a gas nitriding furnace airflow guiding device, comprising a furnace tank, a furnace cover detachably connected to the upper end of the furnace tank, a plurality of evenly distributed placement plates arranged inside the furnace tank, a connecting pipe connected to the outer wall of the furnace tank, a gas storage cylinder with an open upper side fixedly connected to the lower end of the furnace tank, and air pumps arranged on the left and right sides of the gas storage cylinder, with bent pipes connected to the interior of the furnace tank installed at the air inlet ends of the two air pumps, and straight pipes connected to the interior of the gas storage cylinder installed at the air outlet ends of the two air pumps;

[0006] The bottom of the inner wall of the furnace tank is equipped with multiple air outlets that communicate with the interior of the gas storage cylinder.

[0007] An exhaust pipe is installed through the upper end of the furnace cover, and a pressure relief valve is installed inside the exhaust pipe.

[0008] To facilitate the connection, fixation, and support of multiple placement plates, in a preferred embodiment of the gas nitriding furnace airflow guiding device of this utility model, four support rods are connected and fixedly connected through the multiple placement plates, and the four support rods abut against the bottom side of the inner wall of the furnace tank.

[0009] To facilitate gas contact with the workpiece through the placement plates, as a preferred embodiment of the gas nitriding furnace airflow guiding device of this utility model, the multiple placement plates are all mesh structures.

[0010] To facilitate the separate fixing of the two air pumps and the air storage cylinder, in a preferred embodiment of the gas nitriding furnace airflow guiding device of this utility model, the lower end of the air storage cylinder is fixedly connected to a base plate, and both air pumps are fixedly connected to the upper end of the base plate via supports.

[0011] In order to move the furnace cover by a hoisting device when removing the furnace cover, as a preferred gas flow guiding device for a gas nitriding furnace according to this utility model, the upper end of the furnace cover is equipped with a first lifting ring.

[0012] To facilitate the removal and placement of multiple placement plates via a hoisting device, as a preferred embodiment of the gas nitriding furnace airflow guiding device of this utility model, the upper ends of multiple support rods are all fixedly connected with second lifting rings.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] During operation, ammonia gas needs to be introduced into the furnace. After decomposition, the ammonia gas can be used to nitrid the workpiece. When the gas level inside the furnace reaches a certain point, two air pumps continuously draw the gas from the upper part of the furnace into the gas storage tank. The gas inside the storage tank is then discharged to the bottom of the furnace through multiple outlets. As the gas flows inside the furnace, it passes through multiple placement plates and comes into contact with the workpiece. The gas from the storage tank is then dispersed into the furnace through multiple outlets, thereby improving the uniformity of gas-workpiece contact and enhancing the nitriding effect. Simultaneously, new ammonia gas needs to be continuously introduced into the furnace. When the pressure inside the furnace reaches a certain level, a pressure relief valve will release some gas. The flow rate of new ammonia gas introduced into the furnace is determined based on actual conditions to maximize the utilization of ammonia gas. By guiding the gas flow, it circulates within the furnace, increasing the residence time of the gas and thus improving the ammonia utilization rate. Attached Figure Description

[0015] Figure 1 This is a front sectional view of the present invention.

[0016] Figure 2 This is a left-side sectional view of the furnace tank of this utility model;

[0017] Figure 3 This is a top sectional view of the furnace tank of this utility model;

[0018] Figure 4 This is a structural diagram of the placement plate of this utility model.

[0019] In the diagram: 1. Furnace; 2. Placement plate; 3. Connecting pipe; 4. Support rod; 5. Gas storage tank; 6. Air pump; 7. Bend; 8. Straight pipe; 9. Gas outlet; 10. Furnace cover; 11. Exhaust pipe; 12. Pressure relief valve; 13. Second lifting ring; 14. First lifting ring; 15. Base plate. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0021] In the description of this utility model, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and 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, and therefore should not be construed as a limitation of this utility model. Furthermore, in the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0022] Please see Figures 1 to 4 A gas nitriding furnace airflow guiding device includes a furnace tank 1, a furnace cover 10 detachably connected to the upper end of the furnace tank 1, a plurality of evenly distributed placement plates 2 inside the furnace tank 1, a connecting pipe 3 connected to the outer wall of the furnace tank 1, a gas storage cylinder 5 with an open upper side fixedly connected to the lower end of the furnace tank 1, and air pumps 6 are provided on the left and right sides of the gas storage cylinder 5. The air inlet ends of the two air pumps 6 are each equipped with a bent pipe 7 that communicates with the interior of the furnace tank 1, and the air outlet ends of the two air pumps 6 are each equipped with a straight pipe 8 that communicates with the interior of the gas storage cylinder 5.

[0023] Multiple air outlets 9, which communicate with the interior of the gas storage cylinder 5, are installed at the bottom of the inner wall of the furnace tank 1.

[0024] An exhaust pipe 11 is installed through the upper end of the furnace cover 10, and a pressure relief valve 12 is installed inside the exhaust pipe 11.

[0025] In this embodiment: During use, a pressure pipeline for conveying ammonia gas needs to be connected via connecting pipe 3, allowing ammonia gas to be introduced into the furnace tank 1. The furnace tank 1, together with the furnace cover 10, forms a sealed structure, thus concentrating the ammonia gas inside the furnace tank 1. The ammonia gas is heated and decomposed into atomic nitrogen and hydrogen through the furnace tank 1 (the heating and decomposition of ammonia gas is a mature existing technology and is not shown in the attached drawings; the outside of the furnace tank 1 is a furnace shell, and the inside is equipped with a furnace lining for heat preservation and insulation, ensuring the stability and uniformity of the temperature inside the furnace tank 1; the furnace tank 1 is equipped with a heater, usually using resistance heating, which generates heat through resistance wires to raise the temperature inside the furnace tank 1 to the required state, providing the necessary energy for the decomposition of ammonia gas). Then, the workpieces placed on the upper part of the multiple placement plates 2 are nitrided. When the gas inside the furnace tank 1 reaches a certain level, two air pumps 6 are started, and the gas inside the upper side of the furnace tank 1 is continuously drawn into the gas storage cylinder 5 through two bent pipes 7 and two straight pipes 8. The gas inside the gas storage cylinder 5 is discharged to the bottom side of the furnace tank 1 through multiple air outlets 9, so that the gas circulates between the inside of the furnace tank 1 and the gas storage cylinder 5. When the gas flows inside the furnace tank 1, the gas passes through multiple placement plates 2 and comes into contact with the workpiece. The gas inside the gas storage cylinder 5 is dispersed and discharged into the inside of the furnace tank 1 through multiple air outlets 9, thereby improving the uniformity of gas contact with the workpiece and improving the nitriding effect of the workpiece.

[0026] While the gas is circulating, new ammonia needs to be continuously introduced into the furnace tank 1. When the pressure inside the furnace tank 1 reaches a certain level, the pressure relief valve 12 will automatically open, thereby venting some gas from the furnace tank 1. The remaining gas continues to participate in the circulation. The flow rate of new ammonia entering the furnace tank 1 will be determined according to the actual situation (the flow rate of ammonia input will be regulated by the ammonia flow regulating valve, which is installed on the pressure pipeline that delivers ammonia). It is necessary to ensure that the exhaust pipe 11 does not discharge too much gas, thereby reducing the impact on gas circulation, while also ensuring the replacement of old and new gas to maximize the utilization of ammonia. By guiding the gas flow, it is made to circulate within the furnace tank 1, increasing the residence time of the gas within the furnace tank 1, thereby improving the ammonia utilization rate.

[0027] As a technical optimization of this utility model, four support rods 4 are connected and fixedly connected through multiple placement plates 2, and the four support rods 4 abut against the bottom side of the inner wall of the furnace tank 1.

[0028] In this embodiment, four support rods 4 are provided to facilitate the connection, fixation, and support of multiple placement plates 2.

[0029] As a technical optimization of this utility model, all the placement plates 2 are mesh structures.

[0030] In this embodiment, by setting all the placement plates 2 as a mesh structure, it is possible for gas to come into contact with the workpiece through the placement plates 2.

[0031] As a technical optimization of this utility model, the lower end of the air storage cylinder 5 is fixedly connected to the base plate 15, and the two air pumps 6 are fixedly connected to the upper end of the base plate 15 through supports.

[0032] In this embodiment, a base plate 15 is provided to facilitate the fixing of the two air pumps 6 and the air storage cylinder 5 respectively.

[0033] As a technical optimization of this utility model, a first lifting ring 14 is installed at the upper end of the furnace cover 10.

[0034] In this embodiment, a first lifting ring 14 is provided so that when the furnace cover 10 is removed, it can be moved by a lifting device.

[0035] As a technical optimization of this utility model, the upper ends of multiple support rods 4 are all fixedly connected with second lifting rings 13.

[0036] In this embodiment, by setting four second lifting rings 13, it is easier to take out and put in multiple placement plates 2 by means of a lifting device.

[0037] Working Principle: During use, the ammonia gas is connected to a pressure pipeline via connecting pipe 3, allowing the ammonia gas to be introduced into the furnace tank 1. The furnace tank 1, together with the furnace cover 10, forms a sealed structure, concentrating the ammonia gas inside. The ammonia gas is then heated and decomposed into atomic nitrogen and hydrogen in the furnace tank 1 (the heating and decomposition of ammonia gas is a mature existing technology, not shown in the attached diagram; the outer surface of the furnace tank 1 is a furnace shell, while the inner surface is lined for insulation and heat preservation, ensuring a stable and uniform temperature inside the furnace tank 1. A heater, typically using resistance heating, is installed inside the furnace tank 1. The heater generates heat through a resistance wire, raising the temperature inside the furnace tank 1 to the required level, providing the necessary energy for the decomposition of ammonia gas). For nitriding workpieces placed on the upper part of multiple placement plates 2, when the gas inside the furnace tank 1 reaches a certain level, two air pumps 6 are started, and then the gas inside the upper side of the furnace tank 1 is continuously drawn into the gas storage cylinder 5 through two bent pipes 7 and two straight pipes 8. The gas inside the gas storage cylinder 5 is discharged to the bottom side of the furnace tank 1 through multiple air outlets 9, so that the gas circulates between the inside of the furnace tank 1 and the gas storage cylinder 5. When the gas flows inside the furnace tank 1, the gas passes through multiple placement plates 2 and comes into contact with the workpiece. The gas inside the gas storage cylinder 5 is dispersed and discharged into the inside of the furnace tank 1 through multiple air outlets 9, thereby improving the uniformity of gas contact with the workpiece and improving the nitriding effect of the workpiece.

[0038] While the gas is circulating, new ammonia needs to be continuously introduced into the furnace tank 1. When the pressure inside the furnace tank 1 reaches a certain level, the pressure relief valve 12 will automatically open, thereby venting some gas from the furnace tank 1. The remaining gas continues to participate in the circulation. The flow rate of new ammonia entering the furnace tank 1 will be determined according to the actual situation (the flow rate of ammonia input will be regulated by the ammonia flow regulating valve, which is installed on the pressure pipeline that delivers ammonia). It is necessary to ensure that the exhaust pipe 11 does not discharge too much gas, thereby reducing the impact on gas circulation, while also ensuring the replacement of old and new gas to maximize the utilization of ammonia. By guiding the gas flow, it is made to circulate within the furnace tank 1, increasing the residence time of the gas within the furnace tank 1, thereby improving the ammonia utilization rate.

[0039] 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 gas flow guiding device for a gas nitriding furnace, comprising a furnace tank (1), wherein a furnace cover (10) is detachably connected to the upper end of the furnace tank (1), characterized in that: The furnace tank (1) is provided with multiple placement plates (2) evenly distributed vertically inside. The outer wall of the furnace tank (1) is connected to a connecting pipe (3). The lower end of the furnace tank (1) is fixedly connected to a gas storage cylinder (5) with an open structure on the upper side. Air pumps (6) are provided on the left and right sides of the gas storage cylinder (5). The air inlet end of the two air pumps (6) is equipped with a bent pipe (7) that communicates with the inside of the furnace tank (1). The air outlet end of the two air pumps (6) is equipped with a straight pipe (8) that communicates with the inside of the gas storage cylinder (5). The bottom of the inner wall of the furnace tank (1) is equipped with a number of gas outlets (9) that communicate with the interior of the gas storage cylinder (5); An exhaust pipe (11) is installed through the upper end of the furnace cover (10), and a pressure relief valve (12) is provided inside the exhaust pipe (11).

2. The gas flow guiding device for a gas nitriding furnace according to claim 1, characterized in that: Four support rods (4) are connected through and fixed between the multiple placement plates (2), and the four support rods (4) abut against the bottom side of the inner wall of the furnace (1).

3. The gas flow guiding device for a gas nitriding furnace according to claim 1, characterized in that: All of the placement plates (2) are mesh structures.

4. The gas flow guiding device for a gas nitriding furnace according to claim 1, characterized in that: The lower end of the air storage cylinder (5) is fixedly connected to a base plate (15), and both air pumps (6) are fixedly connected to the upper end of the base plate (15) via supports.

5. The gas flow guiding device for a gas nitriding furnace according to claim 1, characterized in that: The upper end of the furnace cover (10) is equipped with a first lifting ring (14).

6. The gas flow guiding device for a gas nitriding furnace according to claim 2, characterized in that: The upper ends of each of the support rods (4) are fixedly connected to a second lifting ring (13).

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