Mesh belt furnace sintering atmosphere homogenizing device

Abstract

The utility model discloses a mesh belt furnace sintering atmosphere homogenizing device which comprises an air inlet pipe, a dispersion baffle and an airflow homogenizing cover, a plurality of airflow dispersion holes are formed in the dispersion baffle, the dispersion baffle is installed below the furnace top of a mesh belt furnace, and a gas dispersion layer is defined by the dispersion baffle and the furnace top of the mesh belt furnace. A pipe opening of the gas inlet pipe extends into the gas dispersing layer, the gas flow homogenizing cover is a round cover body with a one-way opening and comprises a cover bottom and a cover wall, the whole cover wall is tubular, the cover bottom is fixed to an opening in one end of the cover wall, an opening in the other end of the cover wall is fixed to the furnace top of the mesh belt furnace, and the opening in the other end of the cover wall is fixed to the furnace top of the mesh belt furnace. A plurality of circumferential airflow dispersion holes are evenly distributed in the cover wall, and a plurality of airflow through holes are evenly distributed in the cover bottom. By means of the mode, the uniformity of airflow dispersion when air enters the furnace can be improved, the quality fluctuation of sintered products is obviously reduced, and the stability of the products is improved.

Description

Technical Field

[0001] The utility model relates to the field of sintering equipment, in particular to a sintering atmosphere homogenizing device for a mesh belt furnace. Background Art

[0002] A mesh belt furnace is a continuous heating device commonly used for product sintering. When the mesh belt furnace performs sintering work, in order to prevent external environment from polluting the products, gas is usually introduced into the furnace to form a uniform and stable atmosphere, and the influence of external gas on the sintered products is excluded. Currently, the common air intake mechanism of the mesh belt furnace is to supply gas into the furnace through a gas pipe arranged at the top of the furnace wall, and a special baffle is installed on the path where the air flow enters, and air holes are provided on the baffle. The dispersed layer formed between the baffle and the top of the furnace wall is used to disperse the air flow. This method can meet the sintering atmosphere requirements of most products. However, for some products with high requirements for the sintering environment, we found that due to the large space of the dispersed layer, the air flow actually blows directly onto the baffle and then repeatedly turns back between the baffle and the furnace top and enters the furnace through the air holes. After actual detection, the air pressure in each area of this dispersed layer is not balanced. Especially counterintuitively, the air pressure directly below the air hole is the lowest. This atmosphere imbalance will cause fluctuations in the sintering quality of the products conveyed on the mesh belt furnace and is difficult to meet the high-precision requirements of customers. Summary of the Utility Model

[0003] The main technical problem to be solved by the utility model is to provide a sintering atmosphere homogenizing device for a mesh belt furnace, which can improve the uniformity of air flow dispersion and reduce the quality fluctuation of sintered products.

[0004] To solve the above technical problem, a technical solution adopted by the utility model is: to provide a sintering atmosphere homogenizing device for a mesh belt furnace, the sintering atmosphere homogenizing device for the mesh belt furnace includes: an air inlet pipe, a dispersion baffle, and an air flow homogenizing cover. A plurality of air flow dispersion holes are provided on the dispersion baffle. The dispersion baffle is installed below the furnace top of the mesh belt furnace and together with the furnace top of the mesh belt furnace encloses a gas dispersion layer. The pipe orifice of the air inlet pipe extends into the gas dispersion layer. The air flow homogenizing cover is a circular cover with a one-way opening, including a cover bottom and a cover wall. The cover wall is integrally tubular. The cover bottom is fixed on the opening at one end of the cover wall. The opening at the other end of the cover wall is fixed on the furnace top of the mesh belt furnace and covers the pipe orifice of the air inlet pipe. A plurality of circumferential air flow dispersion holes are uniformly arranged on the cover wall, and a plurality of air circulation holes are uniformly arranged on the cover bottom.

[0005] In a preferred embodiment of the utility model, the inner diameter of the cover wall is 1.2 - 2 times the outer diameter of the pipe orifice of the air inlet pipe.

[0006] In a preferred embodiment of the present utility model, the number of the circumferential air flow dispersion holes is not less than four, and the total opening area of all the circumferential air flow dispersion holes is not less than the cross-sectional area of the pipe orifice of the air inlet pipe.

[0007] In a preferred embodiment of the present utility model, the shape of the circumferential air flow dispersion holes is arched, and the bottom of the arch is on the bottom of the cover.

[0008] In a preferred embodiment of the present utility model, the total area of the air flow through holes on the bottom of the cover is smaller than the area of any one of the circumferential air flow dispersion holes.

[0009] In a preferred embodiment of the present utility model, the distance between the air outlet of the air inlet pipe and the bottom of the cover is not less than 5 mm.

[0010] The beneficial effects of the present utility model are as follows: The present utility model further optimizes the existing air flow dispersion structure at the furnace top. By changing the diffusion and distribution mode of the air flow in the gas dispersion layer through the air flow homogenization cover, the flow rates of the gases ejected from various positions on the surface of the dispersion baffle are basically the same, thereby enhancing the uniformity and stability of the atmosphere at various positions in the mesh belt furnace, reducing the influence of the atmosphere agitation caused by the air pressure imbalance at various places on the sintered products at different positions, significantly reducing the quality fluctuation of the sintered products, and meeting the precision requirements of customers. Description of the Drawings

[0011] Figure 1 is the installation schematic diagram of a preferred embodiment of the present utility model;

[0012] Figure 2 is the front view structure schematic diagram of the shown embodiment;

[0013] Figure 3 is the transverse sectional structure schematic diagram of the shown embodiment;

[0014] Figure 4 is the schematic diagram of the traditional air inlet dispersion structure:

[0015] The marks of the components in the drawings are as follows:

[0016] 1. Air inlet pipe, 2. Air flow homogenization cover, 3. Dispersion baffle, 4. Furnace top

[0017] 201. Cover wall, 202. Bottom of the cover, 203. Circumferential air flow dispersion holes, 204. Air flow through holes. Detailed Embodiments

[0018] The following elaborates on the preferred embodiments of the present utility model in conjunction with the drawings, so that the advantages and features of the present utility model can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present utility model.

[0019] Please refer to Figure 1 and Figure 2 , the embodiments of the present utility model include:

[0020] A sintering atmosphere homogenization device for a mesh belt furnace, the sintering atmosphere homogenization device for the mesh belt furnace includes: an air inlet pipe 1, a dispersion baffle 3 and an air flow homogenization cover 2. The dispersion baffle 3 is provided with a plurality of air flow dispersion holes. The dispersion baffle 3 is installed below the furnace top 4 of the mesh belt furnace and together with the furnace top 4 of the mesh belt furnace encloses a gas dispersion layer. The pipe orifice of the air inlet pipe 1 extends into the gas dispersion layer. The air flow homogenization cover 2 is a circular cover body with a one-way opening, including a cover bottom 202 and a cover wall 201. The cover bottom 202 is a circular plate with a diameter of 22 mm. The cover wall 201 is a tubular body as a whole, with an outer diameter of 22 mm, an inner diameter of 16 mm, and a height of 13 mm. The cover bottom 202 is fixed to the opening at one end of the cover wall 202. The opening at the other end of the cover wall 202 is welded and fixed to the furnace top 4 of the mesh belt furnace and covers the pipe orifice of the air inlet pipe 1. 6 circumferential air flow dispersion holes 203 are uniformly arranged on the cover wall 201, and 19 air circulation holes 204 with a diameter of 1.5 mm are uniformly arranged on the cover bottom 202. In this way, after the air flow enters the gas dispersion layer through the air inlet pipe 1, the air flow homogenization cover 2 first scatters the gas horizontally around into the dispersion layer. Although a part of the gas also vertically diffuses downward through the air circulation holes, the total amount is small, just enough to fill the influence of the cover bottom 202 blocking the air flow on the air pressure below, and the uniformity of the air flow entering the furnace through the dispersion layer is improved.

[0021] The inner diameter of the cover wall 202 is 1.2 - 2 times the outer diameter of the pipe orifice of the air inlet pipe 1. In actual production, generally 1.5 times the outer diameter of the pipe orifice of the air inlet pipe 1 is adopted. In this way, the air flow homogenization cover 2 can just cover the pipe orifice of the air inlet pipe 1, and the welded and fixed area between the cover orifice and the furnace top 4 is small, and the cost is low.

[0022] The number of the circumferential air flow dispersion holes 203 is not less than four. Generally, 8 or 6 are adopted during actual implementation. The number adopted in this embodiment is 6. In this way, the space around the entire cover wall 201 can be taken care of, and the weak areas during circumferential dispersion can be reduced. Moreover, the total opening area of all the circumferential air flow dispersion holes 203 is not less than the cross-sectional area of the pipe orifice of the air inlet pipe 1. In this embodiment, it is about 1.5 times the cross-sectional area of the pipe orifice. In this way, the rushing speed of the air flow can be appropriately reduced, and the homogenization effect can be improved.

[0023] The shape of the circumferential air flow dispersion hole 203 is an arch shape, the width of the door body is 5 mm, and the height is 8 mm. The bottom of the arch shape is on the cover bottom 202. In this way, when the air flow blows to the cover bottom 202, it can naturally disperse circumferentially along the arch, and the energy loss is small.

[0024] The total area of the air flow holes 204 on the bottom cover 202 is smaller than the area of any one of the circumferential air flow dispersion holes 203. In this application, the area of the circumferential air flow dispersion hole 203 is 46 mm 2 , while the total area of all the air flow holes 204 is 33.6 mm 2 . The reason for this setting is that if the area of the air flow holes 204 is too large, the air flow rate in the vertical direction will increase, resulting in a significant reduction in the circumferential dispersed air flow and affecting the overall dispersion effect.

[0025] The distance between the air outlet of the intake pipe 1 and the bottom cover 202 is not less than 5 mm, generally about 7 mm. If the distance is too small, the pressure on the bottom cover will be relatively large, reducing the dispersion effect of the circumferential air flow dispersion holes 203.

[0026] By using the air flow homogenization cover 2, the gas in the intake pipe 1 can be dispersed simultaneously in all directions before entering the dispersion layer, significantly reducing the local pressure imbalance caused by the conventional connection method, making the atmosphere in each position of the kiln uniform and stable, and significantly reducing the quality fluctuation of the sintered products.

[0027] The above are only the embodiments of the present utility model, and do not limit the patent scope of the present utility model. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present utility model, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present utility model.

Claims

1. A mesh belt furnace sintering atmosphere homogenization device, characterized in that: The mesh belt furnace sintering atmosphere homogenization device comprises: an air inlet pipe, a dispersion baffle and an airflow homogenization hood, wherein the dispersion baffle is provided with a plurality of airflow dispersion holes, the dispersion baffle is installed below the furnace top of the mesh belt furnace, and together with the furnace top of the mesh belt furnace, surrounds a gas dispersion layer, the pipe mouth of the air inlet pipe extends into the gas dispersion layer, the airflow homogenization hood is a circular hood body with a unidirectional opening, comprising a hood bottom and a hood wall, the hood wall is tubular as a whole, the hood bottom is fixed to the opening at one end of the hood wall, the opening at the other end of the hood wall is fixed to the furnace top of the mesh belt furnace and covers the hood of the air inlet pipe, a plurality of circumferential airflow dispersion holes are evenly arranged on the hood wall, and a plurality of airflow holes are evenly arranged on the hood bottom.

2. The mesh belt furnace sintering atmosphere homogenization device according to claim 1, characterized in that: The inner diameter of the cover wall is 1.2 to 2 times the outer diameter of the air intake pipe opening.

3. The mesh belt furnace sintering atmosphere homogenization device according to claim 1, characterized in that: The number of the circumferential airflow dispersion holes is not less than four, and the total opening area of ​​all the circumferential airflow dispersion holes is not less than the cross-sectional area of ​​the pipe opening of the air inlet pipe.

4. The mesh belt furnace sintering atmosphere homogenization device according to claim 1, characterized in that: The shape of the circumferential airflow dispersion hole is an arch, and the arch bottom is on the cover bottom.

5. The mesh belt furnace sintering atmosphere homogenization device according to claim 1, characterized in that: The total area of ​​the air flow holes on the cover bottom is smaller than the area of ​​any circumferential air flow dispersion hole.

6. The mesh belt furnace sintering atmosphere homogenization device according to claim 1, characterized in that: The distance between the air outlet of the air inlet pipe and the bottom of the cover is not less than 5mm.

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