Large-tonnage one-kiln multi-line on-line TCO conductive glass production line

Abstract

The utility model discloses a large-tonnage one-kiln multi-line online TCO (transparent conductive oxide) conductive glass production line which comprises a kiln body, a feeding pool arranged on the kiln body and used for assisting in feeding, and heat supply assemblies arranged on two sides of the kiln body and used for assisting in supplying heat to the interior of the kiln body, and a plurality of groups of line body assemblies for forming and processing the TCO conductive glass on line are arranged on the downstream of the kiln body. According to the large-tonnage one-kiln multi-line on-line TCO conductive glass production line disclosed by the utility model, in the process of producing and processing TCO conductive glass by using a melting furnace structure, through the mutual matching of the communication component and the plurality of groups of line body components, the forming and processing of the plurality of groups of TCO conductive glass can be simultaneously carried out on line, and in the forming and processing process, the production efficiency of the TCO conductive glass is greatly improved. Through the operation of the edge roller in the tin bath on the multiple groups of wire body assemblies, the TCO conductive glass with different specifications and different shapes can be conveniently processed at the same time.

Description

TECHNICAL FIELD

[0001] The utility model relates to TCO conductive glass production technical field, concretely is a big ton one kiln multi -line on -line TCO conductive glass production line. BACKGROUND

[0002] TCO conductive glass is the most ideal electrode material of CdTe, CIGS and perovskite thin -film solar cell because of having the dual function of transparency and conductivity, TCO conductive glass mainly has three, is ITO, AZO and FTO glass respectively, wherein, compared with off -line coating technology, on -line TCO conductive glass can realize low energy consumption, large -scale and high -quality production using the fresh and clean surface and high temperature environment of float glass.

[0003] The existing on -line TCO conductive glass production line is all the traditional one kiln one line structure, that is, on the basis of the traditional one kiln one line ordinary / ultra -white float glass line, CVD coating machine is added in the low temperature zone of the tin tank to realize, the melting furnace structure of this production line is inconvenient for on -line simultaneous production and processing of different specifications of TCO conductive glass due to the defect of line body quantity.

[0004] The drawing quantity (i.e. ton) of melting furnace, drawing speed and the thickness and width of glass exist certain relations, that is, under the condition that the drawing quantity is fixed, the faster the drawing speed, the thinner and narrower the glass product, on the contrary, the thicker and wider it is. TCO glass needs thin glass as the original piece glass, at the same time, the on -line coating of coating machine also limits that the plate surface cannot be too wide, therefore, under the condition of thin and narrow glass product, the drawing quantity (i.e. ton) of one kiln one line melting furnace is limited, thereby making the energy consumption high.

[0005] The larger the ton of melting furnace is, the lower the energy consumption is. Therefore, a big ton one kiln multi -line on -line TCO conductive glass production line is needed to solve the above -mentioned problems. UTILITY MODEL CONTENTS

[0006] The utility model aims at providing a big ton one kiln multi -line on -line TCO conductive glass production line to solve the problems raised in the above -mentioned background technology.

[0007] In order to realize the above -mentioned purpose, the utility model provides the following technical scheme: a big ton one kiln multi -line on -line TCO conductive glass production line, including the kiln body, the upstream of kiln body is provided with the feeding pool for assisting feeding, still including the heating assembly for assisting the heat supply in the kiln body and being arranged on both sides of kiln body, the downstream of kiln body is arranged with multiple line body assemblies for on -line TCO conductive glass forming and processing;

[0008] The line body assembly comprises a branch line cooling part and a tin tank, the tin tank is connected with the branch line cooling part through a flow channel, the branch line cooling part is connected with the kiln body through a communication assembly, one side of the tin tank is provided with a coating machine for online TCO conductive glass coating treatment after forming, a blocking plate is arranged on the flow channel to block the flowing glass liquid, a lifting assembly is arranged on the flow channel to lift the blocking plate, and a separation assembly is arranged on the flow channel to separate the glass liquid adhered to the surface of the blocking plate during lifting.

[0009] The communication assembly comprises a main passage arranged downstream of the kiln body, the main passage is connected with the kiln body through a neck, and one end of the branch line cooling part of each group of line body assemblies is connected with the main passage.

[0010] The lifting assembly comprises a U-shaped frame fixed to the upper end of the branch line cooling part, a guide assembly is arranged between the U-shaped frame and the blocking plate to guide the blocking plate during lifting, a threaded pipe is rotatably connected to the U-shaped frame, a threaded rod is threadedly connected to the threaded pipe, one end of the threaded rod is fixed to the blocking plate, and a driving motor is installed on the U-shaped frame to drive the threaded pipe.

[0011] The guide assembly comprises two groups of first sleeve pipes fixed to the U-shaped frame, the two groups of first sleeve pipes are symmetrically arranged on the two sides of the threaded pipe, a first sliding rod is slidably connected to the first sleeve pipe, and one end of the first sliding rod is fixed to the blocking plate.

[0012] The separation assembly comprises a mounting frame fixed to the U-shaped frame, a scraper is arranged on one side of the mounting frame, a spring assembly is arranged between the scraper and the mounting frame to press the scraper, and the scraper is pressed against the outer side of the blocking plate under the elastic force of the spring assembly.

[0013] The spring assembly comprises a plurality of second sleeve pipes fixed to the mounting frame, a second sliding rod is slidably connected to the second sleeve pipe, one end of the second sliding rod is fixed to the scraper, a spring is sleeved outside the second sleeve pipe, and the two ends of the spring are respectively arranged against the mounting frame and the scraper.

[0014] The heat supply assembly comprises heat storage chambers arranged on both sides of the kiln body, and small furnaces are connected between the heat storage chambers and the kiln body.

[0015] Preferably, the branch line cooling part is provided with 2-6 branch line cooling parts, the center line of each branch line cooling part is perpendicular to the center line of the main passage, and the center line spacing of each branch line cooling part is 5-30 m.

[0016] Preferably, the length of the branch cooling section is different along the flow path of the glass liquid in the main passage, and the distance from the necking outlet to the outlet of each branch cooling section is different, and the length ranges from 10 to 40 m.

[0017] Preferably, the center line spacing of each branch cooling section is also different; the center line of each branch cooling section coincides with the center line of the flow channel and the tin bath; the coating machine is arranged in the low-temperature area of the tin bath, and each coating machine can be arranged on the left side or the right side of the tin bath, and can be arranged on the same side or on the opposite side; the pool wall of the main passage and each branch cooling section is provided with a heat preservation layer, and the materials are the same, and the thickness of the heat preservation layer of the outermost pool wall of the main passage and the outermost pool wall of the branch cooling section at both ends is 1.1 to 2 times that of the other pool walls.

[0018] Compared with the prior art, the utility model has the beneficial effects that:

[0019] 1. The TCO conductive glass production line of the utility model has a daily drawing amount of 1000-2400 tons, and the number of small furnaces M is 6 to 13, so that the TCO conductive glass is produced on a large-tonnage melting furnace (the drawing amount is greater than or equal to 1000 tons / day), and the production energy consumption of the TCO conductive glass is effectively reduced.

[0020] 2. The production line of the utility model is arranged with N branch cooling sections on the side away from the main body of the melting furnace. The branch cooling sections are arranged to be non-equal-width or equal-width, and can be produced by two-division or three-division according to production needs. The drawing amount of the branch cooling sections is arranged to be non-averagely distributed, so that stable production of TCO conductive glass with different thicknesses in different branches can be realized without reducing the total drawing amount of the melting furnace, the problems of time loss and product loss caused by glass thickness and film layer adjustment in the traditional one-furnace-one-line online TCO glass production line are solved, the process stability is greatly improved, and the process stability is greatly improved.

[0021] 3. The melting furnace and the production line of the utility model are simple in structure, the glass liquid in each branch cooling section is good in thermal balance, and the branch arrangement mode is favorable for necking and process operation of the coating machine set.

[0022] 4. The utility model retains the cooling section of the one-furnace-one-line, eliminates the influence of the shunt on the melting and clarification quality, so that the glass liquid can be fully heat-homogenized after melting and clarification. The glass liquid flow runs more smoothly after necking, the glass liquid only undergoes one-time large-scale turning, the generation of turbulent flow and the erosion of refractory material are greatly reduced, these advantages can make the melting, clarification, homogenization and optical quality of the glass liquid more secure, and the internal, optical quality and mechanical strength of the TCO conductive glass product are better than those of other design modes.

[0023] 5、The utility model discloses a neck card export to each branch line cooling part export distance is set to unequal length according to the different temperature drop degree of each branch line, and this mode can better guarantee the heat balance between each passage. The different spacing between each branch line can make the film coating machine replacement maintenance space more compact, reduce the glass liquid stroke length behind the neck card, reduce the glass liquid heat dissipation, and further realize energy-saving production. The large-tonnage one-kiln multi-line online TCO conductive glass production line of the utility model can simultaneously perform the forming processing of multiple groups of TCO conductive glasses through the cooperation of the communication assembly and the multiple groups of line body assemblies in the process of using the melting furnace structure to produce and process the TCO conductive glasses, and the internal edge puller of the tin bath on the multiple groups of line body assemblies is convenient for simultaneously processing TCO conductive glasses of different specifications and different shapes in the process of forming processing.

[0024] 6、The design of one-kiln multi-line can realize the large-tonnage low-energy-consumption production of the melting furnace under the premise of meeting the small-tonnage narrow-plate wide production of thin glass of each branch line, and solves the problem of small tonnage and high energy consumption of the current TCO glass production line.

[0025] In general, the large-tonnage one-kiln multi-line online TCO conductive glass production line of the utility model can simultaneously perform the forming processing of multiple groups of TCO conductive glasses through the cooperation of the communication assembly and the multiple groups of line body assemblies in the process of using the melting furnace structure to produce and process the TCO conductive glasses, and the internal edge puller of the tin bath on the multiple groups of line body assemblies is convenient for simultaneously processing TCO conductive glasses of different specifications and different shapes in the process of forming processing. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is the overall appearance structure schematic view of the utility model;

[0027] Figure 2 It is the branch line cooling part and the partition baffle structure schematic view of the utility model;

[0028] Figure 3 It is the lifting assembly and the guide assembly structure schematic view of the utility model;

[0029] Figure 4 It is the elastic assembly and the separation assembly structure schematic view of the utility model;

[0030] Figure 5 It is the flow channel structure perspective view of the utility model;

[0031] Figure 6 It is the flow channel structure plan view of the utility model.

[0032] In the figure: 101, kiln body; 102, feeding pool; 201, regenerator; 202, small furnace; 301, branch line cooling part; 302, tin tank; 303, flow channel; 304, coating machine; 401, main passage; 402, neck clamp; 501, U-shaped frame; 502, threaded pipe; 503, threaded rod; 504, driving motor; 601, first sleeve; 602, first sliding rod; 701, mounting frame; 702, scraper; 801, second sleeve; 802, second sliding rod; 803, spring; 9, partition blocking plate. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0034] Please refer to Figures 1-6 The utility model provides a kind of large-tonnage one kiln multi-line online TCO conductive glass production line, including kiln body 101, kiln body 101 upstream is provided with the feeding pool 102 for assisting feeding, further include the heating assembly for assisting the heat supply to kiln body 101 inside for being set to the both sides of kiln body 101, kiln body 101 downstream is arranged with multiple line body assemblies for the line TCO conductive glass forming processing;

[0035] Line body assembly includes branch line cooling part 301, flow channel 303 and tin tank 302;

[0036] It is worth noting here: the inside of tin tank 302 is provided with the edge trimmer for assisting glass liquid forming, wherein the edge trimmer belongs to the conventional technical means in the conductive glass forming process, as prior art in the present application, not too much here;

[0037] Tin tank 302 and branch line cooling part 301 are connected by flow channel 303, branch line cooling part 301 and kiln body 101 are connected by communication assembly, one side of tin tank 302 is provided with the coating machine 304 for the online TCO conductive glass coating treatment after forming, flow channel 303 is provided with the partition blocking plate 9 for the glass liquid partition blocking for flow, flow channel 303 is provided with lifting assembly for lifting partition blocking plate 9 and separating assembly for scraping and separating glass liquid adhered to the surface of partition blocking plate 9 in lifting process;

[0038] It should be noted that: using the melting furnace structure for the production and processing of TCO conductive glass, through the cooperation of the communication assembly and the multiple line body assemblies, multiple TCO conductive glass can be formed and processed at the same time, and in the forming and processing process, through the operation of the edge trimmer inside the tin trough 302 on the multiple line body assemblies, TCO conductive glass of different specifications and different shapes can be processed at the same time.

[0039] The communication assembly includes a main passage 401 arranged downstream of the kiln body 101, which is connected in communication with the kiln body 101 through a neck 402, and one end of the branch line cooling part 301 of each group of line body assemblies is connected in communication with the main passage 401;

[0040] It should be noted that: in the process of using the melting furnace structure for the production and processing of TCO conductive glass, the glass liquid generated after the internal heating and melting of the kiln body 101 is guided and transported towards the branch line cooling part 301 of each group of line body assemblies through the communication and guidance of the neck 402 and the main passage 401.

[0041] The lifting assembly includes a U-shaped frame 501 fixed to the upper end of the branch line cooling part 301, a guide assembly arranged between the U-shaped frame 501 and the partition blocking plate 9 for guiding the partition blocking plate 9 during lifting, a threaded pipe 502 rotatably connected to the U-shaped frame 501, a threaded rod 503 threadedly engaged with the threaded pipe 502, one end of the threaded rod 503 fixed to the partition blocking plate 9, and a drive motor 504 installed on the U-shaped frame 501 for driving the threaded pipe 502;

[0042] It should be noted that: by driving the threaded pipe 502 to rotate through the drive motor 504, and through the mutual engagement transmission between the threaded pipe 502 and the threaded rod 503 and the guiding action of the guide assembly, the partition blocking plate 9 is lifted.

[0043] The guide assembly includes two sets of first sleeve pipes 601 fixed to the U-shaped frame 501, the two sets of first sleeve pipes 601 being symmetrically arranged on both sides of the threaded pipe 502, a first sliding rod 602 slidably connected to the first sleeve pipe 601, and one end of the first sliding rod 602 fixed to the partition blocking plate 9.

[0044] It should be noted that: the partition blocking plate 9 is guided during lifting by the multiple first sleeve pipes 601 and the first sliding rod 602.

[0045] The separation assembly includes a mounting bracket 701 fixed to the U-shaped frame 501, a scraper 702 arranged on one side of the mounting bracket 701, a spring assembly arranged between the scraper 702 and the mounting bracket 701 for pressing the scraper 702, and the scraper 702 being pressed by the spring assembly to abut against the outer side of the partition blocking plate 9.

[0046] It should be noted that: when the line body assembly after suspension needs to be started again, the blocking baffle 9 is driven by the lifting assembly and the guide assembly to no longer be in the state of blocking the branch line cooling part 301, and in the process of the upward movement of the blocking baffle 9, the scraper 702 is kept in abutment with the outer side of the blocking baffle 9 under the elastic force of the elastic assembly, so as to scrape and separate the glass liquid adhered to the surface of the blocking baffle 9 after the blocking, thereby avoiding the dryness of the glass liquid adhered to the blocking baffle 9 and affecting the subsequent blocking of the blocking baffle 9.

[0047] The elastic assembly comprises a plurality of second sleeves 801 fixed to the mounting frame 701, a second sliding rod 802 slidably connected to the second sleeve 801, one end of the second sliding rod 802 fixed to the scraper 702, and a spring 803 arranged outside the second sleeve 801 and in abutment with the mounting frame 701 and the scraper 702 at both ends.

[0048] It should be noted that: the plurality of second sleeves 801 and the second sliding rod 802 assist the stable extension and contraction movement of the scraper 702 under stress, and the spring 803 facilitates the abutment of the scraper 702 with the outer side of the blocking baffle 9.

[0049] The heat supply assembly comprises a regenerator 201 arranged on both sides of the kiln body 101, and a small furnace 202 connected between the regenerator 201 and the kiln body 101.

[0050] It should be noted that the function of the regenerator 201 is heat exchange: the high-temperature flue gas of the melting furnace heats the regenerator, and the regenerator completes heat storage; the combustion-supporting air absorbs the heat of the regenerator and is heated, and the regenerator completes heat release. The external fuel is burned in the small furnace 202 in the high-temperature combustion-supporting air to supply heat to the inside of the kiln body 101.

[0051] The branch line cooling part 301 is provided with 2-6 branch line cooling parts, and the center line of each branch line cooling part 301 is perpendicular to the center line of the main passage 401, and the center line spacing of each branch line cooling part 301 is 5-30 m.

[0052] The length of the branch line cooling part 301 is different along the flow path of the glass liquid in the main passage 401, and the distance from the outlet of the neck ring 402 to the outlet of each branch line cooling part 301 is different, and the length range is 10-40 m.

[0053] The center line spacing of each branch line cooling part 301 is also different; the center line of each branch line cooling part 301 coincides with the center line of the flow channel 303 and the tin tank 302; the coating machine 304 is arranged in the low-temperature area of the tin tank 302, and each coating machine 304 can be arranged on the left side of the tin tank 302 or on the right side of the tin tank 302, and can be arranged on the opposite side or on the same side.

[0054] The pool wall of the main passage 401 and each branch line cooling part 301 is provided with a thermal insulation layer, and the materials are the same. The thickness of the thermal insulation layer of the outermost pool wall of the main passage 401 and the outermost pool wall of the branch line cooling part 301 at both ends is 1.1-2 times the thickness of the thermal insulation layer of other pool walls.

[0055] Working principle: In the process of using the furnace structure to produce and process TCO conductive glass, the glass liquid generated by heating and melting the glass batch in the furnace body 101 is guided by the communication of the neck 402 and the main passage 401, and is transported to the branch line cooling part 301 of each group of wire body assemblies. The glass liquid transported to the inside of the branch line cooling part 301 is transported to the inside of the tin trough 302 through the flow channel 303, and is assisted by the edge pulling machine in the tin trough 302 to form the TCO conductive glass. In the low-temperature zone of the tin trough 302, the TCO conductive glass product is formed by the online coating machine 304 and enters the subsequent process. In the process of forming the TCO conductive glass, the communication assembly and the multiple groups of wire body assemblies are matched with each other, so that multiple groups of TCO conductive glass can be formed and processed at the same time. In the process of forming and processing, the edge pulling machine in the tin trough 302 of the multiple groups of wire body assemblies is operated, so that different specifications and different shapes of TCO conductive glass can be processed online at the same time.

[0056] When it is needed to interrupt the forming and processing of a certain wire body assembly, the lifting assembly and the guide assembly are matched with each other to drive the partition blocking plate 9 to descend and abut against the branch line cooling part 301, so as to block the flow of the glass liquid on the wire body assembly and realize flexible switching of the operation and suspension of different wire body assemblies.

[0057] When it is needed to start the operation of the suspended wire body assembly again, the lifting assembly and the guide assembly are used to drive the partition blocking plate 9 to no longer abut against the branch line cooling part 301. In the process of ascending the partition blocking plate 9, the scraper 702 keeps abutting against the outside of the partition blocking plate 9 under the elastic force of the elastic assembly, so as to scrape and separate the glass liquid adhered to the surface of the partition blocking plate 9 after partitioning, so as to avoid the glass liquid adhered to the partition blocking plate 9 from drying and affecting the subsequent use of the partition blocking plate 9.

[0058] It is apparent for a person skilled in the art that the present application is not restricted to the details of the above exemplary embodiments, but that it can be implemented in other concrete forms without departing from the spirit or the essential characteristics of the present application. Therefore, the embodiments should be considered as exemplary only, and not limiting, the scope of the present application being defined by the appended claims rather than the above description, and all changes coming within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the claims concerned.

Claims

1. A large-tonnage one-kiln multi-line online TCO conductive glass production line, comprising: a kiln body (101) provided with a feeding pool (102) upstream of the kiln body (101) for assisting feeding; characterized in that it further comprises: a heating assembly arranged on both sides of the kiln body (101) for assisting heating of the interior of the kiln body (101), and a plurality of line body assemblies arranged downstream of the kiln body (101) for online TCO conductive glass forming processing; the line body assembly comprises a branch line cooling part (301) and a tin bath (302), the tin bath (302) is connected in communication with the branch line cooling part (301) through a flow channel (303), the branch line cooling part (301) is connected in communication with the kiln body (101) through a communication assembly, one side of the low-temperature zone of the tin bath (302) is provided with a coating machine (304) for online TCO conductive glass coating treatment after forming, the flow channel (303) is provided with a blocking plate (9) for blocking the glass liquid flowing through, and the flow channel (303) is provided with a lifting assembly for lifting the blocking plate (9) and a separation assembly for separating the glass liquid adhered to the surface of the blocking plate (9) during lifting.

2. A large tonnage one-kiln multi-line on-line TCO conductive glass production line according to claim 1, characterized in that: the communication assembly comprises a main passage (401) arranged downstream of the kiln body (101), the main passage (401) is connected in communication with the kiln body (101) through a neck (402), and one end of the branch line cooling part (301) of each line body assembly is connected in communication with the main passage (401).

3. A large tonnage one-kiln multi-line on-line TCO conductive glass production line according to claim 1, characterized in that: the lifting assembly comprises a U-shaped frame (501) fixed to the upper end of the branch line cooling part (301), a guide assembly is arranged between the U-shaped frame (501) and the blocking plate (9) for guiding the blocking plate (9) during lifting, a threaded pipe (502) is rotatably connected to the U-shaped frame (501), a threaded rod (503) is threadedly connected to the threaded pipe (502), one end of the threaded rod (503) is fixed to the blocking plate (9), and a drive motor (504) is installed on the U-shaped frame (501) for driving the threaded pipe (502).

4. A large tonnage one-kiln multi-line on-line TCO conductive glass production line according to claim 3, characterized in that: the guide assembly comprises two sets of first sleeve pipes (601) fixed to the U-shaped frame (501), the two sets of first sleeve pipes (601) are symmetrically arranged on both sides of the threaded pipe (502), a first sliding rod (602) is slidably connected to the first sleeve pipe (601), and one end of the first sliding rod (602) is fixed to the blocking plate (9).

5. A large tonnage one-kiln multi-line on-line TCO conductive glass production line according to claim 3, characterized in that: the separation assembly comprises a mounting frame (701) fixed to the U-shaped frame (501), a scraper (702) is arranged on one side of the mounting frame (701), a spring assembly is arranged between the scraper (702) and the mounting frame (701) for pressing the scraper (702), and the scraper (702) is pressed against the outer side of the blocking plate (9) under the elastic pressing of the spring assembly.

6. A large tonnage one furnace multi-line on-line TCO conductive glass production line according to claim 5, characterized in that: The elastic component comprises a plurality of groups of second sleeves (801) fixed on the mounting frame (701), the second sleeves (801) are slidably connected with second slide rods (802), one end of the second slide rods (802) is fixed with the scraper (702), the outer side of the second sleeve (801) is sleeved with a spring (803), and both ends of the spring (803) are arranged in abutment with the mounting frame (701) and the scraper (702).

7. A large tonnage one furnace multi-line on-line TCO conductive glass production line as claimed in claim 1, wherein: The heat supply assembly comprises regenerators (201) arranged on both sides of the kiln body (101), and the regenerators (201) and the kiln body (101) are in communication connection with small furnaces (202).

8. A large tonnage one furnace multi-line on-line TCO conductive glass production line as claimed in claim 2, wherein: The branch cooling part (301) is provided with 2-6 branch cooling parts (301), the center line of each branch cooling part (301) is perpendicular to the center line of the main passage (401), and the center line spacing of each branch cooling part (301) is 5-30 m.

9. A large tonnage one furnace multi-line on-line TCO conductive glass production line as claimed in claim 2, wherein: The length of the branch cooling part (301) is different along the flow path of the glass liquid in the main passage (401), the distance from the outlet of the neck (402) to the outlet of each branch cooling part (301) is different, and the length range is 10-40 m.

10. A large tonnage one furnace multi-line on-line TCO conductive glass production line as claimed in claim 2 wherein: The center line spacing of each branch cooling part (301) is also different; the center line of each branch cooling part (301) coincides with the center line of the flow channel (303) and the tin tank (302); the coating machine (304) is arranged in the low-temperature area of the tin tank (302), each coating machine (304) can be arranged on the left side of the tin tank (302) or on the right side of the tin tank (302), and can be arranged on the same side or on the opposite side; the pool wall of the main passage (401) and each branch cooling part (301) is provided with a heat preservation layer, and the materials are the same, the thickness of the heat preservation layer of the pool wall of the main passage (401) and the outermost pool wall of the branch cooling part (301) located at both ends is 1.1-2 times that of the heat preservation layer of other pool walls.

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