Mechanism for improving airflow distribution and solar cell sintering furnace

Abstract

The utility model relates to the technical field of solar cell sintering furnaces, in particular to a mechanism for improving airflow distribution and a solar cell sintering furnace, the mechanism for improving airflow distribution comprises a temperature detection element, a compressed air pipeline and a flow guide part, the detection end of the temperature detection element is lower than the air outlet end of the compressed air pipeline, and the flow guide part is arranged on the compressed air pipeline. The temperature detection element is connected with a flow guide part, the upper end of the flow guide part is connected with the temperature detection element, the lower end of the flow guide part expands outwards and curls upwards to form an annular groove, and the annular groove separates the air outlet end of the compressed air pipeline and the detection end of the temperature detection element. And an opening at the upper end of the annular groove is over against the air outlet end of the compressed air, so that the compressed air flows upwards in a reverse scrolling manner. The flow guide piece enables the compressed air not to directly impact the heated product and the thermocouple downwards, so that the production process is carried out stably, the stability of the atmosphere around the thermocouple is protected, and the compressed air is dispersed.

Description

TECHNICAL FIELD

[0001] The utility model relates to solar cell sintering furnace technical field, concretely relates to an institution and solar cell sintering furnace of improvement airflow distribution. BACKGROUND

[0002] In recent years, the photovoltaic cell industry chain in China develops rapidly, new equipment and more efficient technology are iterated continuously, such as TOPCon cell, BC cell and other new large-size, high-efficiency high-temperature sintering cells, and the requirements of each process are more and more strict, the sintering process as the last key process of cell manufacturing, the sintering uniformity and the gas atmosphere in the sintering process have a great influence on the electrical performance, the uniformity and sintering of high-temperature rapid sintering furnace mainly rely on the distribution of heat and the exhaust of organic waste gas driven by compressed air into each temperature zone.

[0003] The inside of the conventional sintering furnace has a layer of high-temperature insulation cotton, and a cavity is formed between the high-temperature insulation cotton and the inner wall of the sintering furnace, and the sintering cavity is only inside the high-temperature insulation cotton, in order to prevent the compressed air from directly impacting the solar cell panel and the temperature detection element, the compressed air is first introduced into the cavity and then dispersed by the cavity, and then penetrates into the cell sintering cavity through the high-temperature insulation cotton, but there are two problems in the penetration process of the compressed air, first, the high-temperature insulation cotton needs necessary heat preservation effect, so the air permeability is poor, so the penetration of the compressed air is less and cannot achieve good heat and atmosphere control effect, second, the position of the single temperature zone in the sintering furnace is separated by the insulation cotton, and there is a large gap, which will form an air curtain effect before and after the temperature zone, so that the waste gas in the temperature zone cannot be smoothly discharged.

[0004] There is an urgent need for an airflow distribution improving mechanism to optimize the airflow distribution in the sintering cavity, so as to facilitate the uniform distribution and smooth discharge of the gas. UTILITY MODEL CONTENTS

[0005] To solve the above technical problems, the utility model provides an airflow distribution improving mechanism and a solar cell sintering furnace, which can effectively improve the airflow distribution during the use of compressed air, and ensure that the detection accuracy of the temperature detection element is not affected.

[0006] The technical solution adopted by the present application for solving the technical problem is as follows:

[0007] An air flow distribution improving mechanism, comprising a temperature detecting element, a compressed air pipe and a flow guide, the detecting end of the temperature detecting element is lower than the air outlet end of the compressed air pipe, the flow guide is connected to the temperature detecting element, the upper end of the flow guide is connected to the temperature detecting element, the lower end of the flow guide expands outward and curls upward to form a ring-shaped groove, the ring-shaped groove separates the air outlet end of the compressed air pipe and the detecting end of the temperature detecting element, the upper end of the ring-shaped groove is open and faces the air outlet end of the compressed air pipe, so that the compressed air cannot directly impact downward, but flows upward and then is evenly distributed from the upper end.

[0008] Further, the flow guide has two conical pipes and a circular ring-shaped bottom plate, the two conical pipes are coaxial, the lower ends of the two conical pipes are close to each other and the upper ends thereof are far away from each other, that is, the upper end of the inner conical pipe has a small diameter and the lower end thereof has a large diameter, the upper end of the outer conical pipe has a large diameter and the lower end thereof has a small diameter, the circular ring-shaped bottom plate is connected between the lower ends of the two conical pipes, and the upper end of the inner conical pipe is higher than the upper end of the outer conical pipe.

[0009] Further, as an improvement of the above technical solution, the two conical pipes and the circular ring-shaped bottom plate are smoothly connected, and the longitudinal section of one side of the flow guide is in a parabolic shape, that is, the flow guide has an inverse curve-shaped horn.

[0010] Further, the detecting end of the temperature detecting element is flush with or slightly lower than the lower end of the ring-shaped groove of the flow guide.

[0011] Further, the flow guide is made of a heat insulation material or a heat insulation material is arranged between the flow guide and the temperature detecting element.

[0012] Preferably, the heat insulation material includes but is not limited to glass fiber, asbestos, rock wool, silicate and aerogel felt.

[0013] A solar cell sintering furnace, comprising an outer shell and high-temperature insulation cotton, a cavity is formed between the high-temperature insulation cotton and the outer shell, the space inside the high-temperature insulation cotton is a sintering chamber, the high-temperature insulation cotton divides the sintering chamber into multiple temperature zones which are connected to each other, each temperature zone is internally provided with the above-mentioned air flow distribution improving mechanism, the air outlet end of the compressed air pipe, the flow guide and the detecting end of the temperature detecting element all penetrate the cavity and the high-temperature insulation cotton and extend into the sintering chamber.

[0014] Further, the temperature detecting element is selected from any one of a thermocouple, a thermal resistor and a bimetallic thermometer.

[0015] Further, the compressed air pipe is located outside the outer shell, the air outlet end of the compressed air pipe is provided with a metal pipe which penetrates the cavity and the high-temperature insulation cotton and extends into the sintering chamber.

[0016] Further, the high-temperature heat insulation cotton divides the space inside the shell into multiple temperature zones, wherein the cavity of a temperature zone in the middle and the cavities of two temperature zones at both ends are respectively communicated with the exhaust pipes.

[0017] Compared with the prior art, the utility model has the beneficial effects that:

[0018] 1. The utility model discloses a compressed air pipeline, a temperature detecting element and a flow guide piece, wherein the flow guide piece makes the compressed air not directly impact the heated product and thermocouple downward, so that the production process is stable, the atmosphere around the thermocouple is stable, the compressed air is dispersed, and the utility model is suitable for some kilns and temperature control equipment where the compressed air and the temperature detecting unit exist simultaneously.

[0019] 2. The utility model is different from the conventional sintering furnace, the compressed air of the conventional sintering furnace is introduced into the cavity, and then penetrates into the sintering cavity through the high-temperature heat insulation cotton, the utility model directly introduces the compressed air into the sintering cavity, which can not only reduce the pressure and flow of the compressed air and reduce waste, but also can avoid the air curtain effect caused by the gap between the high-temperature heat insulation cotton, so that the exhaust gas in the sintering cavity can be smoothly discharged. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the structure schematic diagram of the utility model's mechanism of improving airflow distribution;

[0021] Figure 2 It is the sectional view of the utility model's mechanism of improving airflow distribution;

[0022] Figure 3 It is the flow guide piece schematic of the utility model's mechanism of improving airflow distribution Figure 1 (Sectional view);

[0023] Figure 4 It is the flow guide piece schematic of the utility model's mechanism of improving airflow distribution Figure 2 (Sectional view);

[0024] Figure 5 It is the flow guide piece schematic of the utility model's mechanism of improving airflow distribution Figure 3 (Sectional view);

[0025] Figure 6 It is the structure schematic diagram of the utility model's solar cell sintering furnace (sectional view)

[0026] In the drawing: 1, temperature detecting element; 2, compressed air pipeline; 3, flow guide; 4, annular groove; 5, cylinder; 6, circular bottom plate; 7, conical tube; 8, heat insulation material; 9, shell; 10, high temperature insulation cotton; 11, cavity; 12, sintering cavity; 13, metal pipe; 14, conveying belt; 15, solar cell piece. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the following will be further explained in detail with specific examples.

[0028] As shown in Figure 1 and Figure 2 , an improved air flow distribution mechanism, comprising temperature detecting element 1, compressed air pipeline 2 and flow guide 3, the detection end of temperature detecting element 1 is lower than the air outlet end of compressed air pipeline 2, flow guide 3 is connected to temperature detecting element 1, the upper end of flow guide 3 is connected to temperature detecting element 1, the lower end of flow guide 3 expands outward and curls upward to form annular groove 4, annular groove 4 separates the air outlet end of compressed air pipeline 2 and the detection end of temperature detecting element 1, the upper end of annular groove 4 is open and directly opposite the air outlet end of compressed air, so that compressed air cannot directly impact downward, but flows upward and then uniformly distributes from the upper end, that is, flow guide 3 has a reverse curve horn.

[0029] As shown in Figure 3 , as an embodiment of the utility model, flow guide 3 has two cylinders 5 and a circular bottom plate 6, the two cylinders 5 are coaxial, and the lower end of the two cylinders 5 is connected with the circular bottom plate, and the upper end of the cylinder 5 in the center is higher than the upper end of the cylinder 5 in the outer part.

[0030] As another embodiment of the utility model, flow guide 3 has a cylinder 5, a conical tube 7 and a circular bottom plate 6, the cylinder 5 and the conical tube 7 are coaxial, the conical tube 7 is located inside the cylinder 5, the lower end of the cylinder 5 and the conical tube 7 is connected with the circular bottom plate 6, and the upper end of the conical tube 7 is higher than the upper end of the cylinder 5.

[0031] As shown in Figure 4 , as another embodiment of the utility model, flow guide 3 has two conical tubes 7 and a circular bottom plate 6, the two conical tubes 7 are coaxial, the lower end of the two conical tubes 7 is close to each other, and the upper end is far away from each other, that is, the upper end of the inner conical tube 7 is small in diameter, and the lower end is large in diameter, the upper end of the outer conical tube 7 is large in diameter, and the lower end is small in diameter, the lower end of the two conical tubes 7 is connected with the circular bottom plate 6, and the upper end of the conical tube 7 in the center is higher than the upper end of the conical tube 7 in the outer part.

[0032] As shown in Figure 5As shown, as the deformation of the last embodiment, the two conical tubes 7 and the annular bottom plate 6 are smoothly connected, and the longitudinal section of one side of the flow guide 3 is in parabolic shape.

[0033] The reverse curve-shaped horn can make the airflow roll back, and cannot directly impact the heated product and thermocouple downward, so that the production process is stable, the atmosphere around the thermocouple is stable, the compressed air is dispersed, the utility model is suitable for some kilns and temperature control equipment where compressed air and temperature detection unit exist simultaneously, such as solar cell sintering furnace.

[0034] The detection end of the temperature detection element 1 is flush with or slightly lower than the lower end of the annular groove 4 of the flow guide 3.

[0035] The flow guide 3 is made of heat insulation material or heat insulation material 8 is arranged between the flow guide 3 and the temperature detection element 1, and the heat insulation material includes but is not limited to glass fiber, asbestos, rock wool, silicate and aerogel felt; mainly used for avoiding that the compressed air blows on the flow guide 3 and the detection end of the thermocouple to conduct heat, so as to affect the accuracy of temperature detection.

[0036] As shown in the figure, Figure 6 A solar cell sintering furnace, including a shell 9 and high-temperature insulation cotton 10, the high-temperature insulation cotton 10 and the shell 9 form a cavity 11, the space inside the high-temperature insulation cotton 10 is a sintering cavity 12, and the high-temperature insulation cotton 10 divides the sintering cavity 12 into a plurality of temperature zones that are communicated with each other, each temperature zone is internally provided with the above-mentioned mechanism for improving airflow distribution, the outlet end of the compressed air pipeline 2, the flow guide 3 and the detection end of the temperature detection element 1 all penetrate the cavity 11 and the high-temperature insulation cotton 10 and extend into the sintering cavity 12.

[0037] The utility model is different from conventional sintering furnace, the compressed air of conventional sintering furnace is passed into the cavity 11, then is infiltrated to the sintering cavity 12 through the high-temperature insulation cotton 10, the utility model directly passes the compressed air to the sintering cavity 12, can not only reduce the pressure and flow of compressed air, reduce waste, but also can avoid the air curtain effect generated between the high-temperature insulation cotton 10, can guarantee that the waste gas in the sintering cavity 12 is smoothly discharged.

[0038] The temperature detection element 1 is selected from any one of thermocouple, thermal resistance and bimetallic thermometer.

[0039] The outlet end of the compressed air pipeline 2 is provided with a metal pipe 13.

[0040] The high-temperature insulation cotton 10 divides the space inside the shell 9 into a plurality of temperature zones, and the cavity 11 of one temperature zone located in the middle and the cavities 11 of two temperature zones located at both ends are respectively communicated with exhaust pipes.

[0041] The use principle of the utility model is as follows:

[0042] The compressed air is firstly delivered to the cavity 11 position by the pipeline, and is further deeply introduced into the sintering cavity 12 through the metal interface, because the distance from the temperature control thermocouple is close, the reverse horn mouth changes the compressed air direction, the airflow meets the reverse horn mouth and changes the direction, a part directly disperses to the surrounding, and the solar cell piece 15 on the conveying belt 14 is not directly blown down, but a part of the reverse impact on the top high temperature heat insulation cotton 10, and is dispersed on the top, which maintains the stability of the temperature control thermocouple atmosphere, and realizes the uniformity of the compressed air, which is beneficial to the exhaust gas on the cavity upper part.

[0043] It should be understood that the specific embodiments described herein are merely used to explain the utility model, and are not used to limit the utility model.

Claims

1. A mechanism for improving airflow distribution, characterized by, The temperature detecting element (1) is connected with the flow guide (3), the upper end of the flow guide (3) is connected with the temperature detecting element (1), the lower end of the flow guide (3) expands outward and curls upward to form a ring-shaped groove (4), the ring-shaped groove (4) separates the air outlet end of the compressed air pipeline (2) from the detecting end of the temperature detecting element (1), the upper end of the ring-shaped groove (4) is opened and faces the air outlet end of the compressed air, so that the compressed air flows upward.

2. The mechanism for improving airflow distribution of claim 1, wherein, The longitudinal section of one side of the flow guide (3) is in parabolic shape.

3. The mechanism for improving airflow distribution of claim 2, wherein, The detecting end of the temperature detecting element (1) is flush with or slightly lower than the lower end of the ring-shaped groove (4) of the flow guide (3).

4. The mechanism for improving airflow distribution of claim 1, wherein, The flow guide (3) is made of heat insulation material (8) or heat insulation material (8) is arranged between the flow guide (3) and the temperature detecting element (1).

5. A solar cell sintering furnace, comprising a shell (9) and high-temperature insulation cotton (10), the high-temperature insulation cotton (10) and the shell (9) form a cavity (11), the space inside the high-temperature insulation cotton (10) constitutes a sintering cavity (12), the high-temperature insulation cotton (10) further separates the sintering cavity (12) into multiple temperature zones which are interconnected, each temperature zone is internally provided with the mechanism for improving air flow distribution according to any one of claims 1-4, characterized in that, The air outlet end of the compressed air pipeline (2), the flow guide (3) and the detecting end of the temperature detecting element (1) all penetrate the shell (9), the cavity (11) and the high-temperature insulation cotton (10) and extend into the sintering cavity (12).

6. The solar cell sintering furnace according to claim 5, characterized in that, The temperature detecting element (1) is selected from any one of a thermocouple, a thermal resistance and a bimetallic thermometer.

7. The solar cell sintering furnace according to claim 5, characterized in that, The air outlet end of the compressed air pipeline (2) is provided with a metal pipe (13), the metal pipe (13) penetrates the cavity (11) and the high-temperature insulation cotton (10) and extends into the sintering cavity (12).

8. The solar cell sintering furnace according to claim 5, characterized in that, The cavities (11) of the one temperature zone in the middle and the two temperature zones at the two ends are respectively communicated with exhaust pipes.

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