Spiral radial hot air circulation duct

Abstract

The present invention discloses a spiral radial hot air circulation duct, including two groups of circulation ducts arranged in the preheating chamber of the process furnace, and the two groups of circulation ducts are respectively arranged on both sides of the center line of the boat group's walking direction, and the two groups of circulation ducts are separated by a middle partition; the circulation duct includes an inner duct and an outer duct, the bottom end of the inner duct is connected to the bottom end of the outer duct, the top end of the outer duct is connected to the fan air inlet, the fan air outlet is connected to the top end of the inner duct to form a circulation, and a heater is arranged in the outer duct; a plurality of air guide plates are evenly distributed around the axis of the air inlet below the air inlet, and the plurality of air guide plates are vertically arranged, and the air guide plates are arc-shaped, and there is a gap between two adjacent air guide plates, and the gap gradually increases from the axis of the air inlet to the outer edge of the air guide plate. The present invention can heat the surroundings of the boat group through the heated atmosphere within the specified time, reduce noise, and heat the boat group evenly.

Description

Technical Field

[0001] The invention relates to a circulating air duct arranged in a preheating chamber of a process furnace, in particular to a spiral radial hot air circulating air duct. Background Art

[0002] At present, solar photovoltaic cells are always developing towards improving conversion efficiency and reducing costs. Introducing new ideas and technologies, innovating technical routes, optimizing production line processes, etc. are important measures to improve conversion efficiency and reduce costs. The optimization and innovation of cell surface passivation treatment technology has always been the top priority of cell design and process technology optimization. Adding an electrolyte Al2O3 passivation layer on the back of the cell is an evolution of surface passivation technology from process technologies such as electric field passivation. This technology can maximize the potential gradient across the PN junction, allowing electrons to flow more stably, reducing electron recombination, and improving conversion efficiency.

[0003] This technology is applied on the production line to maintain better and more stable quality of the passivation layer on the back of the battery cell and maximize production capacity, which is necessary to reduce costs and enhance market competitiveness.

[0004] Low energy consumption, fast heating speed and good temperature uniformity are necessary conditions for generating Al2O3 passivation layer by ALD method through chemical reaction on the back of the battery cell, and are also inevitable requirements for maximizing production capacity and reducing costs. The interior of the preheating chamber is a slightly positive pressure air atmosphere, the heat source is the heater, and the heated body is the boat group. Within the specified time cycle (generally about 20 minutes), the surfaces of the boat group (including the top surface, the outer side surface of the bottom surface and the side surface in the gap) are heated evenly, and the heat receiving and heat exchange speed meet the requirements. If it only relies on the natural transfer of the atmosphere in the cavity, it is far from meeting the requirements. The heat transfer between the heater and the boat group must be accelerated by forcing the air medium to circulate rapidly. If only a fan is used to enhance the rapid circulation of the air medium, without a reasonable air duct structure layout, the wind flow output by the fan is easy to form a vortex in a small space, resulting in adverse effects such as low heat exchange rate and high noise. Summary of the invention

[0005] According to the technical problem raised above, a spiral radial hot air circulation duct is provided. The technical means adopted by the present invention are as follows:

[0006] A spiral radial hot air circulation duct comprises two groups of circulation ducts arranged in a preheating chamber of a process furnace, and the two groups of circulation ducts are respectively arranged on both sides of the center line of the boat group's moving direction, and the two groups of circulation ducts are separated by a middle partition; the circulation duct comprises an inner duct, an outer duct arranged outside the inner duct and at both ends of the boat group's moving direction, and a partition separating the inner duct from the outer duct, the boat group is arranged in the inner duct, and the bottom end of the outer duct is connected to the bottom end of the inner duct, the top end of the outer duct is connected to the fan inlet of the fan, the air outlet of the fan is connected to the air inlet of the inner duct, and a heater is arranged in the outer duct; a plurality of air guide plates are evenly distributed around the axis of the air inlet below the air inlet, the plurality of air guide plates are vertically arranged, and the air guide plates are arc-shaped, there is a gap between two adjacent air guide plates, and the gap gradually increases from the axis of the air inlet to the outer edge of the air guide plate.

[0007] The boat assembly includes a tray, a plurality of metal boats arranged in a matrix on the tray, and a plurality of battery cells inserted into the metal boats.

[0008] A plurality of damper curved plates are arranged between the wind guide plate and the metal boat in the inner air duct, and the extension direction of the damper curved plates is perpendicular to the moving direction of the boat group, and the gap between two adjacent damper curved plates forms an air inlet slot.

[0009] The damper bend plate includes two symmetrically arranged L-shaped plates, and the horizontal parts of the two L-shaped plates are connected to the bottom of the air guide plate through long slot holes and threaded sub-components arranged on the horizontal parts, and the position of the damper bend plate is adjusted through the long slot holes to adjust the width of the air inlet slot.

[0010] Among the plurality of air inlet slots, at least one of the air inlet slots faces the middle of the top of the metal boat, and at least one of the air inlet slots faces the gap between two adjacent metal boats.

[0011] The bottom of the tray is provided with a plurality of air holes.

[0012] The axis of the fan coincides with the axis of the air inlet.

[0013] A protective gas exhaust assembly and a protective gas inlet assembly are respectively provided on both sides of the boat group's moving direction in the process furnace preheating chamber, and the heater is also provided at the protective gas exhaust assembly, the protective gas inlet assembly and the process furnace preheating chamber at the bottom of the boat group.

[0014] The bending direction of the air guide plate is the same as the rotation direction of the fan.

[0015] The present invention adopts two groups of circulating air ducts, each group of circulating air ducts includes an inner air duct and an outer air duct. Under the action of the fan, the medium is blown down from the top of the preheating chamber of the process furnace, and introduced into the air inlet slot through the gaps between the plurality of air guide plates. The diameters between the air inlet slots are changed by adjusting the positions of the two damper bends, thereby controlling the air intake of each air inlet slot, so as to achieve the purpose of uniform heating of the boat group and small surface temperature deviation. Afterwards, the medium enters the outer air duct from the bottom of the inner air duct, rises and returns to the air inlet of the inner air duct to complete the medium circulation. The circulating medium heats the boat group, so as to achieve the purpose of preheating the boat group.

[0016] The pattern formed by multiple air guide plates is spiral-shaped and radiates outward around the center of the circle. The air guide plates are vertically arranged, and the friction between the medium and the air guide plates is reduced, thereby reducing the generation of noise. The gap between two adjacent air guide plates gradually increases from the center of the circle to the outside, so that the outer edge of the boat group can also receive sufficient medium, thereby avoiding a situation where there is more medium in the center and less medium in the periphery.

[0017] In order to make up for the defects that the air medium at the bottom of the boat group carries less heat and the heat exchange efficiency becomes lower, a heater is set at the bottom to improve the heat exchange efficiency by relying on heat radiation and air atmosphere heat conduction.

[0018] The use of two sets of circulating air ducts increases the circulation efficiency and can better uniformly heat the boat group. At the same time, the two sets of circulating air ducts are separated by a middle partition, which will not cause the media blown out by the two fans to interfere with each other. The present invention has the following advantages:

[0019] 1. The boat group can be heated evenly on all sides within the specified time.

[0020] 2. The noise is reduced and the boat group is heated evenly.

[0021] 3. Increased heat exchange rate.

[0022] Based on the above reasons, the present invention can be widely promoted in the fields of process furnaces and the like. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0024] Figure 1 It is a front view of a spiral radial hot air circulation duct in a specific embodiment of the present invention.

[0025] Figure 2It is a top view of the spiral radial hot air circulation duct in a specific embodiment of the present invention. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] like Figure 1-2 As shown, the spiral radial hot air circulation duct includes two groups of circulation ducts arranged in the preheating chamber of the process furnace, and the two groups of circulation ducts are respectively arranged on both sides of the center line of the walking direction of the boat group 1, and the two groups of circulation ducts are separated by the middle partition 2, the circulation duct includes an inner duct 3, an outer duct 4 arranged outside the inner duct 3 and a partition 5 separating the inner duct 3 and the outer duct 4, the boat group 1 is arranged in the inner duct 3, and the bottom end of the outer duct 4 is connected to the bottom end of the inner duct 3, and the outer duct 4 is connected to the bottom end of the inner duct 3. The top end is communicated with the fan inlet 61 of the fan 6, the fan outlet 62 of the fan 6 is communicated with the air inlet 31 of the inner air duct 3, a heater 9 is provided in the outer air duct 4, and a plurality of air guide plates 7 are evenly distributed around the axis of the air inlet 31 below the air inlet 31 of the inner air duct 3, the plurality of air guide plates 7 are vertically arranged, and the air guide plates 7 are arc-shaped, and a gap 71 is provided between two adjacent air guide plates 7, and the gap 71 gradually increases from the axis of the air inlet 31 to the outer edge of the air guide plate 7.

[0028] The boat group 1 includes a tray 11, a plurality of metal boats 12 arranged in a matrix on the tray, and a plurality of battery cells 13 inserted on the metal boats 12;

[0029] A plurality of damper curved plates 8 are provided in the inner air duct 3 between the air guide plate 7 and the metal boat 12 , and the extension direction of the damper curved plates 8 is perpendicular to the moving direction of the boat group 1 , and the gap between two adjacent damper curved plates 8 forms an air inlet slot 14 .

[0030] The damper bend plate includes two symmetrically arranged L-shaped plates, and the horizontal parts of the two L-shaped plates are connected to the bottom of the air guide plate 7 through long slot holes and threaded sub-assemblies 81 arranged on the horizontal parts, and the position of the damper bend plate 8 is adjusted through the long slot holes to adjust the width of the air inlet slot 14.

[0031] Among the plurality of air inlet slots 14 , at least one of the air inlet slots 14 faces the middle of the top of the metal boat 12 , and at least one of the air inlet slots 14 faces the gap between two adjacent metal boats 14 .

[0032] The bottom of the tray 11 is provided with a plurality of air holes 15 .

[0033] The axis of the fan 6 coincides with the axis of the air inlet 31 .

[0034] In the process furnace preheating chamber, a protective gas exhaust component 16 and a protective gas inlet component 17 are respectively provided on both sides of the boat group 1 in the moving direction, and the process furnace preheating chamber is also provided with the heater 9 at the protective gas exhaust component 16, the protective gas inlet component 17 and the bottom of the boat group 1.

[0035] The bending direction of the air guide plate 7 is the same as the rotation direction of the fan 6 .

[0036] In this embodiment, 20 metal boats 12 are arranged on the tray 11, and 400 battery cells are inserted in each metal boat 12, totaling 8000 battery cells. The 20 metal boats are arranged in 4 rows in the direction of their movement and in 5 rows perpendicular to their movement. 16 air guide plates 7 are used in each group of circulating air ducts for air guidance, and 32 air guide plates 7 are used in total for the two groups of circulating air ducts. The flow direction of the gas in the gap 71 after the air is guided by the air guide plates 7 is as follows: Figure 2 As shown by the arrows in the figure, it spreads from the center to the surrounding areas.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. The spiral radial hot air circulation duct is characterized by: The invention comprises two groups of circulating air ducts arranged in the preheating chamber of the process furnace, and the two groups of circulating air ducts are respectively arranged on both sides of the center line of the boat group's moving direction, and the two groups of circulating air ducts are separated by a middle partition; the circulating air duct comprises an inner air duct, an outer air duct arranged outside the inner air duct and arranged at both ends of the boat group's moving direction, and a partition separating the inner air duct and the outer air duct, the boat group is arranged in the inner air duct, and the bottom end of the outer air duct is connected with the bottom end of the inner air duct, the top end of the outer air duct is connected with the fan air inlet of the fan, the air outlet of the fan is connected with the air inlet of the inner air duct, and a heater is arranged in the outer air duct; a plurality of air guide plates are evenly distributed around the axis of the air inlet below the air inlet, the plurality of air guide plates are vertically arranged, and the air guide plates are arc-shaped, and there is a gap between two adjacent air guide plates, and the gap gradually increases from the axis of the air inlet to the outer edge of the air guide plate; The boat assembly includes a tray, a plurality of metal boats arranged in a matrix on the tray, and a plurality of battery cells inserted on the metal boats; A plurality of damper curved plates are provided between the air guide plate and the metal boat in the inner air duct, and the extension direction of the damper curved plates is perpendicular to the moving direction of the boat group, and the gap between two adjacent damper curved plates forms an air inlet slot; The damper bent plate comprises two symmetrically arranged L-shaped plates, and the horizontal parts of the two L-shaped plates are connected to the bottom of the air guide plate through long slot holes and threaded sub-assemblies arranged on the horizontal parts, and the position of the damper bent plate is adjusted through the long slot holes to adjust the width of the air inlet slot; Among the plurality of air inlet slots, at least one of the air inlet slots faces the middle of the top of the metal boat, and at least one of the air inlet slots faces the gap between two adjacent metal boats.

2. The spiral radial hot air circulation duct according to claim 1 is characterized in that: The bottom of the tray is provided with a plurality of air holes.

3. The spiral radial hot air circulation duct according to claim 1 is characterized in that: The axis of the fan coincides with the axis of the air inlet.

4. The spiral radial hot air circulation duct according to claim 1 is characterized in that: A protective gas exhaust assembly and a protective gas inlet assembly are respectively provided on both sides of the boat group's moving direction in the process furnace preheating chamber, and the heater is also provided at the protective gas exhaust assembly, the protective gas inlet assembly and the process furnace preheating chamber at the bottom of the boat group.

5. The spiral radial hot air circulation duct according to claim 1 is characterized in that: The bending direction of the air guide plate is the same as the rotation direction of the fan.

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