CN219572633U

CN219572633U - Sintering furnace

Info

Publication number: CN219572633U
Application number: CN202321140144.8U
Authority: CN
Inventors: 陈逸群; 王合龙; 张俊杉
Original assignee: Shandong Zhongxing Cnc Technology Co ltd
Current assignee: Shandong Zhongxing Cnc Technology Co ltd
Priority date: 2023-05-10
Filing date: 2023-05-10
Publication date: 2023-08-22
Anticipated expiration: 2033-05-10

Abstract

The utility model discloses a sintering furnace, which comprises: the furnace body is internally provided with a furnace chamber; the conveying line is arranged in the furnace chamber to convey a product to be processed, and is supported at the edge of the product to be processed; and the gas supporting component is arranged below the conveying line and is provided with an air outlet which faces to the product to be processed and jets out air flow, and the air flow jetted out of the air outlet forms an air cushion below the product to be processed so as to support the product to be processed. The sintering furnace provided by the technical scheme of the utility model can effectively solve the problems of bending abrasion caused by large size and span of a product to be processed, high fragment rate and low product yield.

Description

Sintering furnace

Technical Field

The utility model relates to the technical field of solar cell production equipment, in particular to a sintering furnace.

Background

The solar cell sintering furnace adopts a first generation tunnel type mesh belt sintering furnace and a second generation ceramic roller type sintering furnace. The first generation tunnel type mesh belt sintering furnace adopts a nichrome mesh belt as a moving carrier of a solar cell, the second generation ceramic roller type sintering furnace adopts a ceramic roller as a moving carrier of a silicon wafer, the silicon wafer of a printed circuit sequentially passes through a drying area, a sintering area and a cooling area of the sintering furnace, a monitoring software and an automatic control system regulate roller speed, temperature and the like, and the solar cell is formed through the processes of drying, sintering and cooling.

The solar cell is currently subjected to technology iteration of large-size and flaking technology, and is upgraded from the original 156 to 182 and 210 cells. The lateral span of a large-sized silicon wafer increases and the capacity of the flaked silicon wafer to carry its own weight decreases. The process cleanliness requirement of the solar cell can only take the edge of the silicon wafer as a supporting point, the electrode and the grid line inside the silicon wafer can not produce contact pollution, and the electrode and the grid line are carried by the edge of the supported silicon wafer no matter the metal mesh belt or the ceramic roller way, so that the first-generation second-generation sintering furnace can not be well suitable for the production of large-size cells, the cells are bent and worn in the conveying process, the defects expressed on the production line are high in fragment rate and low in product yield.

Disclosure of Invention

The utility model mainly aims to provide a sintering furnace, and aims to solve the problems that a large-size battery piece is bent and worn in the conveying process due to a conveying mechanism in the existing sintering furnace, so that the fragment rate is high and the product yield is low.

In order to achieve the above object, the present utility model provides a sintering furnace comprising:

the furnace body is internally provided with a furnace chamber;

the conveying line is arranged in the furnace chamber to convey a product to be processed, and is supported at the edge of the product to be processed; and

the gas supporting component is arranged below the conveying line and is provided with an air outlet for jetting air flow towards the product to be processed, and the air flow jetted from the air outlet forms an air cushion below the product to be processed so as to support the product to be processed.

Optionally, the gas support assembly comprises:

a fan for generating the air flow;

the extension direction of the air outlet pipe is consistent with the extension direction of the conveying line, a plurality of air outlets are formed along the extension direction of the air outlet pipe, and the air outlets spray out the air flow towards the middle part of the bottom surface of the product to be processed.

Optionally, the air outlet is obliquely arranged, so that the direction of the air flow is inclined towards the conveying direction of the product to be processed.

Optionally, the furnace chamber includes the transport chamber and holds the chamber and sets up the bottom plate between the two, the outlet duct is located the transport chamber, the fan is located hold the chamber, the fan still is connected with the gas-supply pipe, the gas-supply pipe pass the bottom plate and with the outlet duct intercommunication, the fan still is connected with the intake pipe, the intake pipe pass the bottom plate and with the transport chamber intercommunication.

Optionally, the accommodating cavity is formed with an air duct, and the air duct is respectively communicated with the air delivery pipe and the fan.

Optionally, the air inlet pipe includes the air inlet main pipe and the air inlet branch pipe of intercommunication, the air inlet main pipe with the fan intercommunication, the air inlet branch pipe is equipped with two at least groups, two groups the air inlet branch pipe extends towards respectively the opposite both sides in the transport chamber.

Optionally, a set of running roller is set up respectively to the opposite both sides of transfer chain, the running roller is used for carrying wait to process the product, two sets of have the interval space between the running roller, the air outlet towards wait to process product part blowout in interval space department the air current.

Optionally, two groups of rollers are close to each other, one end side wall of each roller is provided with a conical surface, and the product to be processed is contacted with the conical surface.

Optionally, the sintering furnace is provided with a first heat-preserving layer, and the first heat-preserving layer surrounds and forms the furnace chamber.

Optionally, a second heat-insulating layer is further arranged in the accommodating cavity, the second heat-insulating layer surrounds the air duct, and/or a third heat-insulating layer is arranged at the bottom of the accommodating cavity, the fan is connected with a driving device, and the driving device penetrates through the third heat-insulating layer and is connected with the fan.

According to the technical scheme, the conveying line and the gas supporting component are arranged in the furnace body, the gas supporting component is arranged below the conveying line, specifically, a furnace chamber is formed in the furnace body of the sintering furnace, the conveying line is arranged in the furnace chamber and is supported at the edge of a product to be processed to convey the product to be processed, the size of the product to be processed is large, the transverse span is enlarged, the condition that the middle position is easy to bend downwards is easy to occur, and the gas flow sprayed by the gas supporting component from the air outlet forms an air cushion below the product to be processed to support the product to be processed, so that the problems of bending abrasion of the product to be processed due to large size and span, high fragment rate and low product yield can be effectively solved.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a sintering furnace according to an embodiment of the present utility model;

FIG. 2 is a schematic view of the structure of the air outlet pipe and the air outlet of the embodiment of the sintering furnace;

FIG. 3 is a schematic diagram of the structure of an air duct of an embodiment of the sintering furnace according to the present utility model.

Reference numerals illustrate:

reference numerals	Name of the name	Reference numerals	Name of the name
				1	Furnace body	7	Air inlet pipe
2	Roller wheel	71	Air inlet main pipe
				3	Blower fan	72	Air inlet branch pipe
4	Air delivery pipe	8	Driving device
				41	Air outlet pipe	9	First heat-insulating layer
411	Air outlet	91	Second heat-insulating layer
				5	Air duct	92	Third heat-insulating layer
6	Bottom plate

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.

In the present utility model, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" as it appears throughout includes three parallel schemes, for example "A and/or B", including the A scheme, or the B scheme, or the scheme where A and B are satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

The utility model provides a sintering furnace.

In the prior art, the lateral span of a silicon wafer of a size is increased, and the capability of the flaked silicon wafer to carry its own weight is reduced. The process cleanliness requirement of the solar cell can only take the edge of the silicon wafer as a supporting point, the electrode and the grid line inside the silicon wafer can not produce contact pollution, and the electrode and the grid line are carried by the edge of the supported silicon wafer no matter the metal mesh belt or the ceramic roller way, so that the first-generation second-generation sintering furnace can not be well suitable for the production of large-size cells, the cells are bent and worn in the conveying process, the defects expressed on the production line are high in fragment rate and low in product yield.

In order to solve the technical problems, the conveying line and the gas supporting component are arranged in the furnace body, the gas supporting component is arranged below the conveying line, specifically, a furnace chamber is formed in the furnace body of the sintering furnace, the conveying line is arranged in the furnace chamber and is supported at the edge of a product to be processed so as to convey the product to be processed, the middle position is easy to bend downwards due to the fact that the size of the product to be processed is large, the transverse span is enlarged, and the gas supporting component forms a gas cushion below the product to be processed by gas flow sprayed out of the gas outlet so as to support the product to be processed, so that the problems of bending abrasion, high fragment rate and low product yield of the product to be processed due to the large size and span can be effectively solved.

The above technical scheme is described in detail below with reference to the accompanying drawings.

In an embodiment of the present utility model, as shown in fig. 1 to 3, the sintering furnace includes:

the furnace comprises a furnace body 1, wherein a furnace chamber is formed in the furnace body 1;

the conveying line is arranged in the furnace chamber to convey the product to be processed and is supported at the edge of the product to be processed; and

the gas support assembly is arranged below the conveying line and provided with an air outlet 411 for jetting air flow towards the product to be processed, and the air flow jetted from the air outlet 411 forms an air cushion below the product to be processed so as to support the product to be processed.

In a specific implementation process, the sintering furnace is used for processing the solar cell, and along with the upgrading of the solar cell, the size becomes larger, so that the transverse span of the solar cell is increased in the conveying process, and the capability of the flaked silicon wafer for bearing the self weight is reduced. Because the technological requirement of solar wafer, the transfer chain supports at the edge of wafer, and the position that is close to the centre is unsettled, easily leads to bending deformation and broken problem. According to the technical scheme, the gas supporting component is adopted to form the supporting air cushion at the bottom of the battery piece, so that non-contact bearing force is formed at the bottom of the battery piece, and the sintering process problem of the solar battery piece with large size and flaking is better adapted. Specifically, the gas support assembly is located the below of transfer chain to offer air outlet 411, air outlet 411 blowout air current towards the battery piece bottom, the air current forms the air cushion in battery piece bottom, and the air cushion is for the power of upwards lifting of battery piece, plays the effect of supporting the battery piece, effectively prevents that the silicon wafer from being in stoving, sintering in-process, atress crooked, deformation and broken problem, in jumbo size solar wafer sintering production line, the yield improves to more than 0.1%, brings huge economic benefits for the enterprise.

Specifically, the gas support assembly includes:

a fan 3 for generating an air flow;

the air outlet pipe 41, the extension direction of the air outlet pipe 41 is consistent with the extension direction of the conveying line, a plurality of air outlets 411 are arranged along the extension direction of the air outlet pipe 41, and the air outlets 411 spray air flow towards the middle part of the bottom surface of the product to be processed.

In the specific implementation process, the fan 3 adopts a centrifugal fan 3 and adopts an alumina ceramic impeller, so that the high temperature of 1400 ℃ can be born, and the environment temperature in a sintering furnace is adapted. The impeller rotates to generate air flow, the air flow is conveyed to the air outlet pipe 41, the air outlet pipe 41 extends along the conveying line, a plurality of air outlets 411 are formed in the air outlet pipe 41 at intervals, and the air flow is sprayed out towards the bottom surface of the battery plate through the air outlets 411. In practice, since the conveying line is supported at the edge of the battery plate, the position of the battery plate close to the middle is easy to bend due to the action of gravity, and it can be understood that the position of the air flow close to the air outlet 411 is subjected to large acting force of the air flow, therefore, in this embodiment, the air outlet 411 ejects the air flow towards the position of the bottom surface of the battery plate close to the middle, and the air flow upwards supports the battery plate to overcome the gravity of the battery plate. Due to the blocking effect of the battery piece, airflow can be dispersed to the periphery after encountering the battery piece, and an air cushion is formed at the bottom of the battery piece so as to play a supporting role on the battery piece and avoid bending caused by self gravity. In addition, the number and arrangement modes of the fans 3 and the air outlet pipes 41 can be set according to the extension length of the sintering furnace chamber, and the device can be suitable for battery pieces with different sizes, so that the battery pieces can be effectively supported.

Further, as shown in fig. 2, the air outlet 411 is inclined so that the direction of the air flow is inclined toward the conveying direction of the product to be processed. In a specific implementation process, the conveying line conveys the battery piece along a certain direction, the air outlet 411 on the air outlet pipe 41 is inclined to enable the air flow to incline to the advancing direction of the battery piece to form an upward inclined lifting force, the air flow generates a component force in the advancing direction of the battery piece, and the air flow can also give a forward moving thrust to the battery piece on the premise of bearing the dead weight of the battery piece, so that the battery piece is convenient to convey.

Optionally, the furnace chamber includes conveying chamber and holds the chamber and sets up bottom plate 6 between the two, and conveying chamber is located to outlet duct 41, and fan 3 is located and is held the chamber, and fan 3 still is connected with gas-supply pipe 4, and gas-supply pipe 4 passes bottom plate 6 and communicates with outlet duct 41, and fan 3 still is connected with intake pipe 7, and intake pipe 7 passes bottom plate 6 and communicates with conveying chamber.

In the specific implementation process, the bottom plate 6 separates the furnace chamber to form a conveying cavity and a containing cavity, the conveying line is arranged in the conveying cavity, and the fan 3 is arranged in the containing cavity. The air outlet pipe 41 is connected with an air delivery pipe 4, and air flow generated by air is delivered to the air outlet pipe 41 through the air delivery pipe 4, in this embodiment, one end of the air delivery pipe 4 is connected with the side wall of the air outlet pipe 41, and the other end of the air delivery pipe 4 is communicated with the fan 3 to receive the air flow generated by the fan 3. It can be appreciated that the air outlet pipe 41 may be connected with a plurality of air delivery pipes 4 in parallel, so as to improve the air flow stability of the air outlet 411. Further, the accommodating cavity is formed with an air duct 5, and the air duct 5 is respectively communicated with the air pipe 4 and the fan 3. Specifically, the air duct 5 is located at the side of the fan 3, the air flow generated by the fan 3 is discharged through the air duct 5, one end of the air duct 4 passes through the bottom plate 6 and is communicated with the air duct 5, the air flow enters the air duct 4 through the air duct 5, and the air duct 4 conveys the air flow to the air outlet pipe 41 and is ejected through the air outlet 411 of the air outlet pipe 41.

Alternatively, the air inlet pipe 7 comprises an air inlet main pipe 71 and an air inlet branch pipe 72 which are communicated, the air inlet main pipe 71 is communicated with the fan 3, at least two groups of air inlet branch pipes 72 are arranged, and the two groups of air inlet branch pipes 72 extend towards two opposite sides in the conveying cavity respectively.

In this embodiment, the fan 3 is connected to the air inlet pipe 7, one end of the air inlet pipe 7 passes through the bottom plate 6 to be communicated with the fan 3, and the other end extends to the conveying cavity to form a circulating air flow, so that the hot air is recycled in a high temperature environment of 900 ℃. Further, the air inlet main pipe 71 is communicated with the fan 3, and two groups of air inlet branch pipes 72 extend in the conveying cavity in the direction close to the two side walls so as to ensure the balance of air flow. The air flow sprayed out of the air outlets 411 is dispersed to the periphery, as the air outlet pipe 41 extends along the direction of the conveying line, one sides, close to each other, of the air flows sprayed out of two adjacent air outlets 411 can form interference, most of the air flows can be dispersed to two sides of the air outlet pipe 41 after encountering the blocking of the battery piece, the air inlets of the two groups of air inlet branch pipes 72 extend towards two sides respectively, the air flows enter the fan 3 through the air inlet branch pipes 72, are sprayed out through the air outlets 411 under the action of the fan 3, form the recycling of the air flow, and can stir the temperature field in the furnace chamber more uniformly. In this way, in the furnace chamber of the sintering furnace, hot air flows through the air inlet pipe 7 and enters the high-temperature circulating fan 3 to generate high-temperature and high-pressure hot air, the hot air is sprayed out through the air outlet 411 of the air outlet pipe 41, and an air cushion is formed below the battery piece, so that a non-contact supporting force is generated on the battery piece. The air flow entering the fan 3 is taken from the interior of the furnace chamber, the air cushion temperature is ensured to be adapted to the sintering temperature of the battery piece, and the uniformity of the sintering furnace temperature field can be improved through the circulation of the air flow.

Optionally, a set of rollers 2 is respectively disposed on two opposite sides of the conveying line, the rollers 2 are used for conveying products to be processed, a space is formed between the two sets of rollers 2, and the air outlet 411 ejects air flow towards the products to be processed at the space.

In a specific implementation process, the battery piece is conveyed through rotation of the roller 2, and in order to ensure the production process of the battery piece, the roller 2 supports the edge of the battery piece. Further, in order to reduce the direct contact area with the battery piece, the side wall of one end of each roller 2 close to each other is provided with a conical surface, and a product to be processed is contacted with the conical surface, so that the bad battery piece caused by contact in the conveying process is avoided. An interval space is formed between the two groups of rollers 2, the battery piece part corresponding to the interval space is suspended without support, air is sprayed to the battery piece part of the interval space through the air outlet 411, a bearing force is generated on the battery piece, and the battery piece part is prevented from bending.

Optionally, the sintering furnace is provided with a first heat-preserving layer 9, the first heat-preserving layer 9 surrounding the furnace chamber. Further, a second heat-insulating layer 91 is further arranged in the accommodating cavity, the second heat-insulating layer 91 surrounds the air duct 5, and/or a third heat-insulating layer 92 is arranged at the bottom of the accommodating cavity, the fan 3 is connected with a driving device 8, and the driving device 8 penetrates through the third heat-insulating layer 92 and is connected with the fan 3.

In this embodiment, the fan 3 is directly located in the space formed by the second heat-insulating layer 91, and the second heat-insulating layer 91 further forms the air duct 5, so that the second heat-insulating layer 91 forms the housing of the fan 3, so that the second heat-insulating layer 91 and the fan 3 are integrated, and the assembly of the sintering furnace is simplified. In addition, the fan 3 is connected with a driving device 8, and the driving device 8 drives the fan 3 to rotate to generate air flow. The third heat preservation 92 is arranged below the fan 3, the driving device 8 comprises a driving shaft and a motor, the driving shaft penetrates through the third heat preservation 92 to be connected with the fan 3, the motor is arranged on one side, away from the fan 3, of the third heat preservation 92 and is connected with the driving shaft, the motor drives the driving shaft to rotate, and the driving shaft drives the fan 3 to rotate to generate air flow. Thus, the motor and the bearing are in the normal temperature region by the heat insulation of the third heat insulating layer 92, and the durability of the apparatus is improved.

The foregoing description is only of the optional embodiments of the present utility model, and is not intended to limit the scope of the utility model, and all equivalent structural modifications made by the present utility model in the light of the present utility model, the description and the accompanying drawings, or direct/indirect application in other related technical fields are included in the scope of the present utility model.

Claims

1. A sintering furnace, characterized in that the sintering furnace comprises:

the furnace body is internally provided with a furnace chamber;

2. The sintering furnace of claim 1, wherein the gas support assembly comprises:

a fan for generating the air flow;

3. The sintering furnace according to claim 2, wherein the air outlet is provided obliquely so that the direction of the air flow is inclined toward the conveying direction of the product to be processed.

4. The sintering furnace of claim 2, wherein the furnace chamber comprises a conveying chamber and a containing chamber, a bottom plate is arranged between the conveying chamber and the containing chamber, the air outlet pipe is arranged in the conveying chamber, the fan is arranged in the containing chamber, the fan is further connected with an air conveying pipe, the air conveying pipe penetrates through the bottom plate and is communicated with the air outlet pipe, and the fan is further connected with an air inlet pipe, and the air inlet pipe penetrates through the bottom plate and is communicated with the conveying chamber.

5. The sintering furnace according to claim 4, wherein the accommodating chamber is formed with an air duct which communicates with the air duct and the blower, respectively.

6. The sintering furnace according to claim 4, wherein the air inlet pipe comprises an air inlet main pipe and an air inlet branch pipe which are communicated, the air inlet main pipe is communicated with the fan, the air inlet branch pipe is provided with at least two groups, and the two groups of air inlet branch pipes extend towards two opposite sides in the conveying cavity respectively.

7. The sintering furnace according to claim 1, wherein a set of rollers is provided on opposite sides of the conveyor line, the rollers are used for conveying the product to be processed, a space is provided between the two sets of rollers, and the air outlet ejects the air flow toward the product to be processed at the space.

8. The sintering furnace according to claim 7, wherein side walls of one ends of the two sets of rollers, which are close to each other, are provided with tapered surfaces, and the product to be processed is in contact with the tapered surfaces.

9. The sintering furnace according to claim 1, wherein the sintering furnace is provided with a first heat-retaining layer surrounding the furnace chamber.

10. The sintering furnace according to claim 5, wherein a second heat-insulating layer is further arranged in the accommodating cavity, the second heat-insulating layer surrounds the air duct, and/or a third heat-insulating layer is arranged at the bottom of the accommodating cavity, and the fan is connected with a driving device, and the driving device penetrates through the third heat-insulating layer and is connected with the fan.