A bottom fixed felt

Abstract

The application discloses a bottom fixed felt, relates to the field of solar photovoltaic, and comprises a fixed felt base body and a splicing plug; the fixed felt base body comprises a plurality of base body through holes which penetrate through the fixed felt base body in the axial direction; the splicing plug is detachably fixed in the base body through hole, and the splicing plug comprises a plug body and a heat preservation part; the plug body is an internal hollow structure with a cylindrical hole in the center, and the heat preservation part is filled in the internal hollow structure. When solar photovoltaic crystal pulling is performed, the bottom fixed felt provided by the application can be used, the bottom fixed felt of the electrode through hole and the gas guide through hole and other vulnerable parts is arranged to be detachable through the arrangement of the splicing plug, when the vulnerable parts are corroded and worn, only the splicing plug can be replaced, and therefore the overall service life of the bottom fixed felt is prolonged. Therefore, the application can reduce the influence of the opening of the bottom fixed felt on the overall bottom fixed felt.

Description

Technical Field

[0001] This application relates to the field of solar photovoltaics, and in particular to a bottom fixing felt. Background Technology

[0002] With the rapid development of the photovoltaic industry, the thermal field structure has been continuously iterated and upgraded, gradually stabilizing. Cost reduction and efficiency improvement have become the new competitive goals of the industry's technological development. The bottom solid felt is an important component of the thermal field structure and is the most important structure to ensure the stability of the thermal field gradient during crystal pulling. At present, most of the monocrystalline silicon industry uses long-fiber PAN-based felt for solid felt. However, due to its special physicochemical properties, it is prone to pulverization and flaking under high-temperature baking in actual use, which negatively affects the cleanliness and heat preservation requirements of crystal pulling, and its lifespan is generally short, resulting in high costs. According to the actual situation, the electrode through-hole is a heating zone, and the opening position pulverizes quickly. The gas guide through-hole is also generally short-lived due to the scouring of high-temperature airflow in the furnace. Therefore, the lifespan of the bottom solid felt substrate through-hole determines the lifespan of the entire bottom solid felt, resulting in a waste of energy due to short-term gains.

[0003] Therefore, how to reduce the impact of the opening at the bottom of the bottom fixing felt on the overall bottom fixing felt is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] This application proposes a bottom fixing felt that enables the replacement of the opening at the bottom fixing felt and reduces the impact of the opening at the bottom fixing felt on the overall bottom fixing felt.

[0005] To achieve the above objectives, this application discloses the following technical solutions:

[0006] A bottom fixing felt includes a fixing felt substrate and splicing plugs; the fixing felt substrate includes a plurality of substrate through holes that penetrate the fixing felt substrate along the axial direction; the splicing plugs are detachably fixed in the substrate through holes, and the splicing plugs include a plug body and an insulation part, the plug body is an internal hollow structure with a cylindrical hole in the center, and the insulation part is filled in the internal hollow structure.

[0007] In some embodiments, the plug-in body includes a cover and a shell, the cover being an annular structure and detachably fixed to the shell, the shell being an internally hollow structure.

[0008] In some embodiments, the outer shell is provided with a boss structure, and the felt substrate is provided with a receiving part at the position of the substrate through hole, and the boss structure can be fixed to the receiving part.

[0009] In some embodiments, the substrate through-hole includes a positioning hole, an electrode through-hole, and a gas guiding through-hole;

[0010] The positioning hole is located at the center of the solid felt substrate, and the furnace body positioning shaft can pass through the positioning hole;

[0011] Electrode through holes are arranged along the centerline of the solid felt substrate, and air guide through holes are evenly arranged with the positioning holes as the center.

[0012] In some embodiments, the plug-in body includes an electrode plug-in and a gas guide plug-in, wherein the electrode plug-in is detachably connected to the electrode through hole, and the gas guide plug-in is detachably connected to the gas guide through hole.

[0013] In some embodiments, the electrode insert also includes a sealing assembly;

[0014] The sealing assembly is located between the electrode insert and the electrode, ensuring a leak-proof seal between the electrode insert and the electrode when they are in contact.

[0015] The sealing component is located between the electrode insert and the electrode through hole, ensuring that when the electrode insert and the electrode through hole are in contact, a leak-proof seal is achieved between the electrode insert and the electrode through hole.

[0016] In some embodiments, the air guide insert also includes a sealing component;

[0017] The sealing component is located between the air guide plug and the air guide through hole, ensuring that when the air guide plug and the air guide through hole are in contact, a seal is achieved between the air guide plug and the air guide through hole to prevent leakage.

[0018] In some embodiments, the plug-in body includes at least two first clamping portions, which are evenly arranged on the plug-in body.

[0019] In some embodiments, the felt substrate is provided with at least two second clamping portions, which are evenly arranged on the felt substrate.

[0020] In some embodiments, the substrate of the solid felt is equipped with sensors to monitor the thermal insulation performance and air permeability of the splicing plugs, allowing for real-time replacement of the splicing plugs. As can be seen from the above technical solution, the bottom solid felt provided in this solution can be used during solar photovoltaic crystal pulling. By setting up splicing plugs, the bottom solid felt at easily worn parts such as electrode through holes and gas guide through holes can be made detachable. When these easily worn parts corrode and wear, only the splicing plugs need to be replaced, thereby improving the overall service life of the bottom solid felt. Therefore, using this solution can reduce the impact of openings in the bottom solid felt on the overall bottom solid felt. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some examples or embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort, and this application can be applied to other similar scenarios based on the provided drawings, all of which fall within the scope of protection of this utility model. Unless obvious from the linguistic context or otherwise specified, the same reference numerals in the drawings represent the same structure or operation.

[0022] Figure 1 This is a plan view of the bottom fixing felt provided in an embodiment of this application;

[0023] Figure 2 This is an SS cross-sectional view of the bottom fixing felt provided in an embodiment of this application;

[0024] Figure 3 A perspective view of the splicing plug provided in the embodiments of this application;

[0025] Wherein: 10 - Bottom fixing felt;

[0026] 100-Film substrate; 100a-Second clamping part; 101a-Receiving part; 200-Splicing plug; 300-Sensor;

[0027] 110-Substrate through hole; 111-Positioning hole; 112-Electrode through hole; 113-Gas guide through hole; 210-Plug body; 211-Electrode plug; 212-Gas guide plug; 220-Insulation part; 201-Cover; 202-Outer shell; 202a-Boss structure. Detailed Implementation

[0028] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the application and not intended to limit it. The described embodiments are only a part of the embodiments of the present application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without inventive effort are within the scope of protection of the present application.

[0029] To reduce the impact of the substrate through-hole 110 of the bottom fixing felt 10 on the overall bottom fixing felt 10, this application describes the structure of the bottom fixing felt 10 in detail with reference to the accompanying drawings:

[0030] like Figures 1 to 3As shown, this application provides a bottom fixing felt 10, including a fixing felt substrate 100 and a splicing plug 200; the fixing felt substrate 100 includes a plurality of substrate through holes 110 extending axially through the fixing felt substrate 100; the splicing plug 200 is detachably fixed in the substrate through holes 110, the splicing plug 200 includes a plug body 210 and a heat insulation part 220, the plug body 210 is an internal hollow structure with a cylindrical hole in the center, and the heat insulation part 220 fills the internal hollow structure.

[0031] When manufacturing solar photovoltaic crystal pulls, the bottom mounting felt 10 provided in this solution can be used. By setting up splicing plugs 200, the bottom mounting felt 10 at easily worn parts such as electrode through holes 112 and gas guide through holes 113 can be made detachable. When these easily worn parts corrode and wear, only the splicing plugs 200 need to be replaced, thereby improving the overall service life of the bottom mounting felt 10. Therefore, using this solution can reduce the impact of the openings in the bottom mounting felt 10 on the overall bottom mounting felt 10.

[0032] As the highlight of this application, the splicing plug-in 200 also has many ingenious structural features. The structure of the splicing plug-in 200 will be described in detail below:

[0033] The function of the splicing plug 200 is to allow for the replacement of only the corroded and worn splicing plug 200, rather than the entire bottom felt 10, by making the easily worn parts detachable. The splicing plug 200 specifically includes a plug body 210 and an insulation section 220. The plug body 210 is typically made of carbon-carbon composite material and designed with a hollow internal structure. The insulation section 220, which is prone to pulverization and wear, is filled into the hollow structure. Because carbon-carbon composite material has excellent high-temperature resistance and can withstand rapid temperature rises and falls within the thermal field, and because its hardness and wear resistance far exceed those of the carbon felt structure of the felt matrix 100, using carbon-carbon composite material for the easily worn parts can resist the high-speed erosion of high-temperature airflow and extend the service life of the plug body 210. The insulation section 220 filled inside the insert body 210 can be made of adhesive-based scrap felt, which combines insulation performance with low cost. This type of adhesive-based felt has certain insulation properties and is inexpensive; it can typically be made from scrap materials, allowing for waste recycling. When the felt pulverizes, it can be replaced immediately. Alternatively, in some embodiments, PAN-based felt can be used as the insulation section 220. PAN-based felt has superior insulation performance, a more stable structure, and stronger resistance to pulverization, making it a suitable alternative to adhesive-based felt.

[0034] To facilitate the replacement of the insulation section 220, the insert body 210 typically includes a cover 201 and a shell 202. The cover 201 is detachably fixed to the shell 202, and both the cover 201 and the shell 202 are made of carbon-carbon composite material. Since the central axis of the shell 202 is a hollow cylinder, the cover 201 is also designed as a ring structure. Typically, a high-temperature resistant alloy ring of the same size as the outer ring of the cover 201 is placed on top of the cover 201. Graphite felt is placed between the cover 201 and the shell 202, and the cover 201 is then pressed and fixed to the shell 202 using high-temperature resistant alloy bolts. The purpose of this is to firmly fix the cover 201 to the outer shell 202, effectively resisting vibrations in the high-temperature thermal field and preventing the cover 201 from loosening; at the same time, the bolt connection makes it easy to replace the internal insulation part 220, allowing for multiple disassembly and assembly; the graphite soft felt pad between the cover 201 and the outer shell 202 can also ensure the airtightness of the cover 201 and extend the service life of the insulation part 220.

[0035] Of course, the plug-in body 210 itself needs to be firmly connected, and the connection between the plug-in body 210 and the felt substrate 100 also needs to be firmly established. To meet the above requirements, the outer shell 202 needs to be designed as a boss structure 202a. The so-called boss structure 202a refers to a hollow cylinder at the bottom and an overlapping platform with a protruding structure at the top. See [reference needed]. Figure 2 and Figure 3 In this embodiment, a hollow cylinder, one size larger than the lower cylinder, is used as the overlapping platform. Correspondingly, the felt substrate 100 needs to have a receiving portion 101a of the same size as the overlapping platform at the position of the substrate through hole 110, so that the boss structure 202a can overlap the receiving portion 101a. To ensure a firm connection between the insert body 210 and the felt, and to facilitate disassembly, some embodiments also provide external threads on the outer ring of the outer shell 202 of the insert body 210 and internal threads on the inner ring of the substrate through hole 110. The insert body 210 is screwed into the substrate through hole 110 like a screw. This design effectively ensures the stability of the connection between the insert body 210 and the substrate through hole 110 under high-temperature airflow.

[0036] In some cases, to facilitate the disassembly and replacement of the splicing plug 200, at least two first clamping parts are provided on the plug body 210. When there are two first clamping parts, the line connecting the two first clamping parts passes through the center of the plug body 210 and the distance between them and the center is equal, thereby ensuring the stability of clamping the plug body 210. When there are three first clamping parts, the three first clamping parts are arranged symmetrically around the center of the plug body 210, and the angle between the line connecting the three first clamping parts and the center is 120°, and so on. The first clamping part can be a preset groove or a pre-embedded metal hanging interface.

[0037] The above describes the main structure and connection method of the splicing plug 200. Next, we will introduce the relationship between the splicing plug 200 and the substrate through hole 110.

[0038] Different substrate through holes 110 are provided on the bottom solid felt 10, including positioning holes 111, electrode through holes 112, and gas guide through holes 113, each with a different function. Taking the positioning hole 111 as an example, its function is to position the bottom solid felt 10 to the boiler. By passing the boiler's furnace body positioning shaft through the positioning hole 111, the bottom solid felt 10 can be positioned to the boiler. Because the furnace body positioning shaft is located on the same axis as the boiler, and the positioning hole 111 is located on the axis of the bottom solid felt 10, the two axes coincide, thus achieving coaxiality between the bottom solid felt 10 and the boiler, and consequently, positioning of the bottom solid felt 10 to the boiler. The electrode through hole 112 is a through hole reserved for the furnace body heating electrode. Typically, the furnace body heating electrode includes two, one positive and one negative. Therefore, there are also two electrode through holes 112. The function of the electrode through hole 112 is to provide heat insulation and sealing for the holes through which the external electrode passes after passing through the bottom solid felt 10 into the furnace body. The gas guide hole 113 is used to allow the high-temperature gas flow inside the furnace to be discharged outward through the gas guide hole 113. As the temperature inside the furnace rises, the gas flow pressure increases, and the gas guide hole 113 is needed to release this pressure to ensure the pressure balance inside the furnace and the stable operation of the thermal field.

[0039] Normally, the positioning hole 111 is located at the axis of the bottom solid felt 10, the electrode through hole 112 is located on the line passing through the axis of the bottom solid felt 10 and is arranged symmetrically, and the air guide through hole 113 is evenly arranged with the axis of the bottom solid felt 10 as the center.

[0040] Since the positioning hole 111 is fixedly connected to the furnace body positioning shaft and usually experiences no wear, there is no need to consider installing the splicing plug 200. Because the electrode through hole 112 is in direct contact with the electrode, vibration and high-voltage ionization occur during electrode operation, leading to corrosion and wear around the electrode through hole 112. Therefore, it is essential to install the splicing plug 200 on the electrode through hole 112. The gas guide through hole 113 is the main channel for high-temperature and high-pressure gas flow. Under the repeated scouring of the high-temperature and high-pressure gas flow, it is highly susceptible to wear and corrosion. Therefore, it is also essential to install the splicing plug 200 on the gas guide through hole 113.

[0041] Therefore, the plug-in body 210 needs to be equipped with corresponding electrode plug-in 211 and gas guide plug-in 212. The electrode plug-in 211 is detachably connected to the electrode through hole 112, and the gas guide plug-in 212 is detachably connected to the gas guide through hole 113. In addition to the threaded connection mentioned above, a high-temperature resistant metal pressure plate can be provided on the opposite side of the felt substrate 100 where the boss structure 202a is located, in conjunction with the boss structure 202a of the electrode plug-in 211 and the gas guide plug-in 212. The high-temperature resistant metal pressure plate is larger than the cylindrical structure. It is fixed to the electrode plug-in 211 or the gas guide plug-in 212 by bolts, and thus fixed to the felt substrate 100. This connection can effectively increase the installation stability of the electrode plug-in 211 and the gas guide plug-in 212, and is easy to disassemble, facilitating replacement and adjustment at any time.

[0042] Furthermore, to prevent unnecessary airflow erosion at the connection between the electrode insert 211 and the electrode through hole 112 or the electrode, in some embodiments, the electrode insert 211 also includes a sealing component. The sealing component is located between the electrode insert 211 and the electrode, ensuring a leak-proof seal between the electrode insert 211 and the electrode when they are in contact. Typically, the sealing component can be a flexible graphite ring, fitted onto the electrode. The flexible graphite ring is pressed and fixed by fixing the electrode insert 211, thus achieving a sealing effect. Similarly, a flexible graphite gasket should also be provided between the electrode insert 211 and the electrode through hole 112. This gasket is pressed firmly between the electrode insert 211 and the electrode through hole 112 by bolt tightening or high-temperature resistant metal pressure plate connection, as mentioned above, to prevent airflow from passing through.

[0043] Electrode insert 211 includes a sealing component, and so does the gas guide insert 212. Although the gas guide insert 212 is designed to allow high-temperature, high-pressure gas flow, any gap between it and the gas guide through-hole 113 will affect the airflow and disrupt the thermal field. Therefore, sealing between the gas guide insert 212 and the gas guide through-hole 113 is crucial. Similar to the sealing of electrode insert 211, the gas guide insert 212 can also be sealed using a flexible graphite gasket. The gas guide insert 212 and the gas guide through-hole 113 are connected by bolts or a high-temperature resistant metal pressure plate, which presses the flexible graphite gasket into the gap between them, thus achieving a seal.

[0044] The sealing components described above can effectively fill the gaps between the electrode insert 211 and the electrode, between the electrode insert 211 and the electrode through hole 112, and between the gas guide insert 212 and the gas guide through hole 113, generating strong resistance to airflow and preventing airflow from passing through. They can also be disassembled and replaced at any time. Most importantly, the flexible graphite is resistant to high temperatures and will not contaminate the raw materials in the hot zone.

[0045] The relationship between the splicing plug 200 and the substrate through hole 110 has been introduced above. Next, the structural features of the felt substrate 100 will be introduced.

[0046] To facilitate the disassembly and replacement of the felt substrate 100, at least two second clamping portions 100a are provided on the felt substrate 100, and the second clamping portions 100a are evenly arranged on the felt substrate 100. Taking the provision of two second clamping portions 100a as an example, the lines connecting the two second clamping portions 100a to the positioning holes 111 are in a straight line, and the distance between them and the positioning holes 111 is equal. This arrangement ensures that when the felt substrate 100 is hoisted through the two second clamping portions 100a, the force is even in all directions, making the hoisting more stable. Taking the setting of three second clamping parts 100a as an example, the three second clamping parts 100a are evenly distributed with the positioning hole 111 as the center, and the included angle between the line connecting the three second clamping parts 100a and the positioning hole 111 is 120°. This arrangement can also ensure that when the felt substrate 100 is hoisted through the three second clamping parts 100a, the force in each direction is uniform, making the hoisting more stable.

[0047] Furthermore, to better monitor the corrosion and wear of the splicing plug 200 and achieve preventative real-time replacement, sensors 300, typically temperature and / or pressure sensors, are installed on the felt substrate 100. By monitoring the thermal insulation performance and / or air permeability of the splicing plug 200, the thickness and / or corrosion level of the splicing plug 200 can be determined. This information is then compared with a preset database to determine whether replacement of the splicing plug 200 is necessary. In some embodiments, a resistance sensor is used to measure the conductivity of the splicing plug 200 to determine the degree of corrosion and wear inside the splicing plug 200; alternatively, a laser rangefinder is used to detect the thickness of the splicing plug 200 to determine whether it has abnormally expanded or contracted, thereby assessing the degree of corrosion and wear. Further details are omitted here.

[0048] In the above context, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0049] In the description of the embodiments of this application, unless otherwise stated, " / " means "or". For example, A / B can mean A or B. "And / or" in this article is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone.

[0050] It should be noted that, for ease of description, only the parts relevant to the application are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0051] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed, and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. The scope of this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described application concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A bottom fixing felt, characterized in that, Includes a solid felt substrate (100) and splicing inserts (200); The felt substrate (100) includes a plurality of substrate through holes (110) that extend axially through the felt substrate (100). The splicing plug (200) is detachably fixed inside the through hole (110) of the base. The splicing plug (200) includes a plug body (210) and a heat insulation part (220). The plug body (210) is an internal hollow structure with a cylindrical hole in the center. The heat insulation part (220) fills the internal hollow structure.

2. The bottom fixing felt as described in claim 1, characterized in that, The plug-in body (210) includes a cover (201) and a shell (202). The cover (201) is a ring structure and is detachably fixed to the shell (202). The shell (202) is a hollow structure.

3. The bottom fixing felt as described in claim 2, characterized in that, The outer shell (202) is provided with a boss structure (202a), and the felt substrate (100) is provided with a receiving part (101a) at the position of the substrate through hole (110), and the boss structure (202a) can be fixed to the receiving part (101a).

4. The bottom fixing felt as described in claim 1, characterized in that, The substrate through hole (110) includes a positioning hole (111), an electrode through hole (112), and a gas guiding through hole (113). The positioning hole (111) is located at the center of the solid felt substrate (100), and the furnace body positioning shaft can pass through the positioning hole (111). The electrode through holes (112) are arranged along the center line of the solid felt substrate (100), and the air guide through holes (113) are evenly arranged with the positioning holes (111) as the center.

5. The bottom fixing felt as described in claim 4, characterized in that, The plug body (210) includes an electrode plug (211) and a gas guide plug (212). The electrode plug (211) is detachably connected to the electrode through hole (112), and the gas guide plug (212) is detachably connected to the gas guide through hole (113).

6. The bottom fixing felt as described in claim 5, characterized in that, The electrode insert (211) also includes a sealing assembly; The sealing assembly is located between the electrode insert (211) and the electrode, ensuring that when the electrode insert (211) is in contact with the electrode, a leak-proof seal can be achieved between the electrode insert (211) and the electrode. The sealing assembly is located between the electrode insert (211) and the electrode through hole (112), ensuring that when the electrode insert (211) contacts the electrode through hole (112), a seal can be achieved between the electrode insert (211) and the electrode through hole (112) to prevent leakage.

7. The bottom fixing felt as described in claim 5, characterized in that, The air guide insert (212) also includes a sealing component; The sealing component is located between the air guide plug (212) and the air guide through hole (113), ensuring that when the air guide plug (212) contacts the air guide through hole (113), a seal can be achieved between the air guide plug (212) and the air guide through hole (113) to prevent leakage.

8. The bottom fixing felt as described in claim 1, characterized in that, The plug-in body (210) includes at least two first clamping parts, which are evenly arranged on the plug-in body (210).

9. The bottom fixing felt as described in claim 1, characterized in that, The felt substrate (100) is provided with at least two second clamping parts (100a), which are evenly arranged on the felt substrate (100).

10. The bottom fixing felt as described in claim 1, characterized in that, The solid felt substrate (100) is equipped with a sensor (300) to monitor the heat insulation performance and air permeability of the splicing plug (200) so as to replace the splicing plug (200) in real time.

Images