Feeder

Abstract

The utility model relates to a feeder which comprises a first feeding pipe and a second feeding pipe, the first feeding pipe is a first material part, the second feeding pipe is a transparent second material part, the second feeding pipe is detachably connected to one axial end of the first feeding pipe, and the second feeding pipe and the first feeding pipe are coaxial. The density of the first material part is smaller than that of the second material part; according to the feeder, the first feeding pipe and the second feeding pipe are detachably connected, when the first feeding pipe or the second feeding pipe is damaged, only the first feeding pipe and the second feeding pipe need to be detached, the damaged first feeding pipe or the damaged second feeding pipe needs to be replaced, the whole feeder does not need to be scrapped, the cost is effectively reduced, and the production efficiency is improved. And the larger the density of the object with the same volume is, the heavier the object is, so that the density of the first material part is smaller than that of the second material part, the weight of the first feeding pipe can be effectively reduced, the weight of the whole feeder is further reduced, and the disassembly and replacement difficulty of the feeder is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of single crystal silicon production, and in particular to a feeder. Background Art

[0002] In recent years, photovoltaic power generation, as a green energy and a major energy source for sustainable human development, has been increasingly valued and developed by countries around the world. As a basic material for photovoltaic power generation, monocrystalline silicon wafers have a wide market demand. Monocrystalline silicon wafers are usually obtained by slicing monocrystalline silicon rods, so the quality of monocrystalline silicon rods will eventually affect the quality of silicon wafers.

[0003] In practical applications, single crystal silicon rods are usually pulled through single crystal furnaces. When pulling single crystal silicon rods, current single crystal furnaces need to use quartz feeders to feed into the single crystal furnace. However, since the feeder needs to constantly withstand the impact of material blocks poured from a high altitude during use, the bottom of the feeder is prone to fatigue damage. In addition, since the temperature inside the single crystal furnace is relatively high, the feeder needs to repeatedly withstand hot and cold shocks during feeding, which also makes the bottom of the feeder more susceptible to damage than the upper and middle parts. However, most common feeders currently have an integral structure, and can only be scrapped after the bottom is damaged, resulting in great waste. Utility Model Content

[0004] Based on this, it is necessary to provide a feeder to address the problem that the feeder can only be scrapped after the bottom is damaged.

[0005] A feeder, comprising:

[0006] A first feeding pipe is made of a first material;

[0007] A second feeding tube, which is a transparent second material, is detachably connected to one axial end of the first feeding tube, and the second feeding tube is coaxial with the first feeding tube;

[0008] Wherein, the density of the first material part is smaller than the density of the second material part.

[0009] In one embodiment, the heat resistance of the first material piece is better than the heat resistance of the second material piece.

[0010] In one embodiment, the plasticity of the first material piece is better than the plasticity of the second material piece.

[0011] In one embodiment, the first feeding tube is a polytetrafluoroethylene tube.

[0012] In one embodiment, the second feeding tube is a quartz tube, a silicon carbide tube or a silicon nitride tube.

[0013] In one embodiment, the first feeding tube and the second feeding tube have different axial lengths.

[0014] In one embodiment, the ratio of the axial lengths of the first feeding tube and the second feeding tube is in the range of 1:1.1-1:2.

[0015] In one embodiment, the inner diameter of the first feeding tube is consistent with the inner diameter of the second feeding tube.

[0016] In one of the embodiments, a reinforced pipe section is disposed at one end of the second feeding pipe away from the first feeding pipe, and the outer diameter of the reinforced pipe section is greater than the outer diameters of other pipe sections of the second feeding pipe.

[0017] In one embodiment, the ratio of the axial length between the reinforced pipe section and other pipe sections of the second feeding pipe is in the range of 1:3.5-1:4.

[0018] The above-mentioned feeder connects the first feeding tube and the second feeding tube in a detachable manner, so that when the first feeding tube or the second feeding tube is damaged, it is only necessary to disassemble the two and replace the damaged first feeding tube or the damaged second feeding tube, without having to scrap the entire feeder, thereby effectively reducing costs and reducing waste. Moreover, since the greater the density of an object of the same volume, the heavier the weight, by making the density of the first material component smaller than the density of the second material component, the weight of the first feeding tube can be effectively reduced, thereby reducing the weight of the entire feeder and reducing the difficulty of disassembling and replacing the feeder. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of a feeder according to some embodiments of the present application.

[0020] Figure 2 for Figure 1 AA section view.

[0021] Figure 3 This is a schematic diagram of the structure of the feeder of some embodiments of the present application from another perspective.

[0022] Figure 4 This is a schematic structural diagram of the feeder of some embodiments of the present application from another perspective.

[0023] Reference numerals:

[0024] 1. First feeding pipe; 2. Second feeding pipe; 21. Strengthening pipe section; 3. Flange fittings; 4. Support arm. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0026] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0027] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0028] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0029] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0030] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0031] As a basic material for photovoltaic power generation, single crystal silicon wafers have a wide market demand. At present, single crystal silicon wafers are usually obtained by slicing single crystal silicon rods, and single crystal silicon rods are usually pulled by single crystal furnaces. When pulling single crystal silicon rods in the current single crystal furnace, it is necessary to first add material blocks to the quartz feeder, and then use the quartz feeder to perform an appropriate amount of feeding operation on the single crystal furnace. When adding material blocks to the quartz feeder, since the material blocks are poured into the quartz feeder from a high place, the quartz feeder will continue to bear the impact of the material blocks, which is easy to cause fatigue damage. At the same time, since the bottom of the quartz feeder is subject to greater pressure from the material blocks, and the bottom of the quartz feeder is closer to the single crystal furnace with a higher temperature, the bottom of the quartz feeder is more susceptible to damage than the middle and upper parts of the quartz feeder. However, most common quartz feeders are now integral structures, and the fragile bottom can only be scrapped after damage, resulting in great waste. Therefore, the feeder is a spare part that suffers severe wear and tear during actual use. Improving the service life of the feeder is of great significance for reducing production costs. Therefore, there is an urgent need for a feeder that can replace the broken bottom alone to solve the problem that the above-mentioned feeder can only be scrapped after the bottom is damaged, thereby effectively saving production costs.

[0032] See also Figure 1 and Figure 2An embodiment of the present application provides a feeder, comprising a first feeding pipe 1 and a second feeding pipe 2. The first feeding pipe 1 and the second feeding pipe 2 are connected to each other in a detachable manner, so that when the first feeding pipe 1 or the second feeding pipe 2 is damaged, only the two need to be disassembled, and the damaged first feeding pipe 1 or the second feeding pipe 2 needs to be replaced, without having to scrap the entire feeder, effectively reducing costs and waste.

[0033] In the specific configuration, the second feeding pipe 2 is detachably connected to one axial end of the first feeding pipe 1, and the second feeding pipe 2 is coaxial with the first feeding pipe 1. When the first feeding pipe 1 is damaged, the feeder can remove the first feeding pipe 1 from the second feeding pipe 2 and replace the first feeding pipe 1 alone. When the second feeding pipe 2 is damaged, the feeder can remove the second feeding pipe 2 from the first feeding pipe 1 and replace the second feeding pipe 2 alone, effectively reducing the maintenance and replacement costs.

[0034] Specifically, the first feeding pipe 1 and the second feeding pipe 2 are detachably connected through the flange fitting 3. More specifically, the first feeding pipe 1 is provided with a first connecting flange at one end close to the second feeding pipe 2, and the second feeding pipe 2 is provided with a second connecting flange at one end close to the first feeding pipe 1. The first feeding pipe 1 and the second feeding pipe 2 are detachably connected through the first connecting flange and the second connecting flange connected by bolts.

[0035] In one embodiment, both the first connecting flange and the second connecting flange are flat flanges. In another embodiment, both the first connecting flange and the second connecting flange are conical flanges. The flat flange refers to a flange whose cross section along the axis of the first connecting flange and the second connecting flange is rectangular. The conical flange refers to a flange whose cross section along the axis of the first connecting flange and the second connecting flange is triangular or right-angled trapezoidal. The conical flange can prevent the first connecting flange and the second connecting flange from being damaged by collision with other mechanisms during the feeding process, and the conical surface of the conical flange can serve as a guide.

[0036] In addition, the first feeding pipe 1 and the second feeding pipe 2 can be straight pipes, and the cross-sections of the first feeding pipe 1 and the second feeding pipe 2 perpendicular to the axis are both circular, elliptical or polygonal. In the embodiment of the present application, the first feeding pipe 1 and the second feeding pipe 2 are both straight pipes, and the cross-sections of the first feeding pipe 1 and the second feeding pipe 2 perpendicular to the axis are both circular.

[0037] The second feeding tube 2 is made of a transparent second material, and the transparent material makes it convenient for the staff to observe the internal situation of the feeder. The first feeding tube 1 is made of the first material, and the density of the first material is less than the density of the second material. Since the greater the density of an object of the same volume, the heavier the weight, by making the density of the first material less than the density of the second material, the weight of the first feeding tube 1 can be effectively reduced, thereby reducing the weight of the entire feeder and reducing the difficulty of disassembling and replacing the feeder. That is, the above structure ensures that the staff can smoothly observe the internal situation of the feeder by making the second feeding tube 2 a transparent second material part, and by making the first feeding tube 1 a first material part with a density less than the density of the second material part, the weight of the first feeding tube 1 can be effectively reduced, thereby reducing the weight of the entire feeder and reducing the difficulty of disassembling and replacing the feeder.

[0038] See also Figure 1-Figure 4 When the feeder of the present application is used, a plugging piece for opening and closing the pipe opening of the second feeding pipe 2 can be firstly provided at the end of the second feeding pipe 2 away from the first feeding pipe 1, a support arm 4 can be fixedly connected to the end of the first feeding pipe 1 away from the second feeding pipe 2, and a connecting rod can be slidably connected on the support arm 4, so that the connecting rod is inserted into the first feeding pipe 1 and the second feeding pipe 2, and is locked with the plugging piece at the pipe opening of the second feeding pipe 2. The locking connection refers to making the two interconnected parts unable to be separated in one direction, such as the connection between the countersunk hole and the cone head.

[0039] Specifically, the first feeding pipe 1 has a flange at one end away from the second feeding pipe 2, and the support arm 4 is fixedly connected to the flange by bolts. The support arm 4 is generally in the shape of a , and support feet are arranged at both ends thereof. A through hole is arranged in the middle of the support arm 4, and a connecting rod is inserted and slidably inserted in the through hole. The connecting rod passes through the first feeding pipe 1 and the second feeding pipe 2, and is detachably fixedly connected with the plugging piece. By sliding the connecting rod up and down, the plugging piece can be conveniently controlled to open and close the pipe mouth of the second feeding pipe 2. After installation, align the pipe mouth of the second feeding pipe 2 together with the plugging piece with the feed port of the single crystal furnace, and then feed the single crystal furnace through the feeder. In addition, the above-mentioned plugging piece can be plate-shaped, or it can be cone-shaped or table-shaped, as long as it can open and close the mouth of the second feeding pipe 2. The sealing member has a guide surface on one side close to the second feeding tube 2, and the guide surface extends from the first feeding tube 1 to the second feeding tube 2 in a direction away from the central axis of the second feeding tube 2, so that when the feeder is feeding, the material block can slide into the single crystal furnace along the guide surface.

[0040] In summary, the feeder of the present application connects the first feeding tube 1 and the second feeding tube 2 in a disassembly manner, so that when the first feeding tube 1 or the second feeding tube 2 is damaged, it is only necessary to disassemble the two and replace the damaged first feeding tube 1 or the second feeding tube 2, without having to scrap the entire feeder, thereby effectively reducing costs and reducing waste. Moreover, since the greater the density of an object of the same volume, the heavier the weight, by making the density of the first material component smaller than the density of the second material component, the weight of the first feeding tube 1 can be effectively reduced, thereby reducing the weight of the entire feeder and reducing the difficulty of disassembly and replacement of the feeder.

[0041] In one embodiment, the heat resistance of the first material part is better than that of the second material part, so that the high temperature resistance of the first feeding tube 1 is better than that of the second feeding tube 2. In addition, the plasticity of the first material part is better than that of the second material part, so that the first feeding tube 1 is less likely to be damaged than the second feeding tube 2. It can be understood that since the bottom of the second feeding tube 2 is subject to greater pressure from the material block and the second feeding tube 2 is closer to the single crystal furnace with a higher temperature, the second feeding tube 2 is more susceptible to damage and easier to be replaced than the first feeding tube 1. Therefore, by making the first feeding tube 1 have better high temperature resistance and plasticity, the service life of the first feeding tube 1 can be effectively extended, so that the first feeding tube 1 can be used for a long time, the number of replacements of the first feeding tube 1 is reduced, and the maintenance and replacement cost of the feeder is reduced.

[0042] In one embodiment, the first feeding tube 1 is a polytetrafluoroethylene tube, so that the first feeding tube 1 has the properties of light weight, high temperature resistance and not easy to break. Specifically, the first feeding tube 1 is a polytetrafluoroethylene tube. Among them, polytetrafluoroethylene (Teflon) is a high molecular polymer obtained by polymerization of tetrafluoroethylene as a monomer, has excellent heat resistance and cold resistance, can be used for a long time in an environment of 180-260°C, and has the characteristics of acid and alkali resistance, resistance to various organic solvents, and is almost insoluble in all solvents. At the same time, polytetrafluoroethylene also has the characteristics of high temperature resistance, and its friction coefficient is extremely low, so it can be used as a lubricant and also become an ideal coating for the inner layer of easy-to-clean water pipes. Therefore, the first feeding tube 1 can effectively prevent the material from sticking to the first feeding tube 1 by using a polytetrafluoroethylene tube made of polytetrafluoroethylene, and utilize the heat resistance, chemical inertness and low friction of polytetrafluoroethylene, so as to avoid the first feeding tube 1 from polluting the raw materials under high temperature conditions, and further ensure the qualified rate of the produced single crystal silicon rods.

[0043] In one embodiment, the second feeding tube 2 is a quartz tube, a silicon carbide tube or a silicon nitride tube, so that the second feeding tube 2 has the properties of transparency and high temperature resistance, so that the second feeding tube 2 can not only perform the feeding operation on the single crystal furnace, but also enable the staff to observe the internal situation of the feeder through the second feeding tube 2.

[0044] Specifically, in one embodiment, the second feeding tube 2 is a quartz tube. Quartz is one of the most widely distributed minerals on the earth's surface, and its main component is SiO2. It is a resource with very stable physical and chemical properties. Quartz glass generally has good light transmittance, high temperature resistance, corrosion resistance, electrical insulation, etc., and is therefore also widely used in high-tech product industries that require high temperature, corrosion resistance, light transmittance, filtering and other production process environments. Therefore, the second feeding tube 2 adopts a quartz tube made of quartz, and utilizes the good light transmittance, high temperature resistance, corrosion resistance and electrical insulation of quartz, so that the second feeding tube 2 can be used to feed the single crystal furnace while allowing the staff to smoothly observe the internal situation of the feeder through the second feeding tube 2.

[0045] In another embodiment, the second feeding tube 2 is a silicon carbide tube. Pure silicon carbide is a colorless and transparent crystal, and industrial silicon carbide is light yellow, green, blue or even black due to the type and content of impurities contained, and the transparency varies with its purity. The second feeding tube 2 adopts a silicon carbide tube made of silicon carbide, and utilizes the light transmittance and good chemical properties and wear resistance of silicon carbide, so that the second feeding tube 2 can be used to feed the single crystal furnace while allowing the staff to smoothly observe the internal situation of the feeder through the second feeding tube 2.

[0046] In another embodiment, the second feeding tube 2 is a silicon nitride tube. Silicon nitride is an important structural ceramic material with excellent properties such as high thermal stability, strong oxidation resistance and high product dimensional accuracy. It can resist thermal shock and will not break even if it is heated to above 1000°C in air, cooled rapidly and then heated rapidly. And because silicon nitride is a covalent compound with high bond strength and can form an oxide protective film in the air, it also has good chemical stability. It will not be oxidized below 1200°C. The protective film formed at 1200-1600°C can prevent further oxidation, and it will not be infiltrated or corroded by many kinds of molten metals or alloys such as aluminum, lead, tin, silver, brass, and nickel. Therefore, the second feeding tube 2 adopts a silicon nitride tube made of silicon nitride, and utilizes the light transmittance and good thermal stability, oxidation resistance and chemical stability of silicon nitride, so that the second feeding tube 2 can be used to feed the single crystal furnace while allowing the staff to smoothly observe the internal situation of the feeder through the second feeding tube 2.

[0047] See also Figure 1-Figure 4 In one embodiment, the first feeding pipe 1 and the second feeding pipe 2 have different axial lengths. After the feeder is limited by the flange fitting 3 connecting the first feeding pipe 1 and the second feeding pipe 2, the first feeding pipe 1 or the second feeding pipe 2 with a longer axial length can be extended into the single crystal furnace.

[0048] Specifically, in one embodiment, the axial length of the second feeding tube 2 is greater than the axial length of the first feeding tube 1. When the feeder is assembled with the single crystal furnace, the second feeding tube 2 can be extended into the single crystal furnace and limited by the flange fitting 3. In another embodiment not shown, the axial length of the first feeding tube 1 is greater than the axial length of the second feeding tube 2. When the feeder is assembled with the single crystal furnace, the first feeding tube 1 can be extended into the single crystal furnace and limited by the flange fitting 3.

[0049] In one embodiment, the ratio of the axial length between the first feeding tube 1 and the second feeding tube 2 is in the range of 1:1.1-1:2. It is understood that the ratio of the axial length between the first feeding tube 1 and the second feeding tube 2 can be in the range of 1:1.1, 1:1.3, 1:1.5, 1:1.7, 1:1.9 or 1:2. The axial length of the first feeding tube 1 can be 700mm, 705mm, 710mm, 715mm, 720mm, 725mm, 730mm, 735mm, 740mm, 745mm, 750mm, 755mm, 760mm, 765mm or 750mm. The axial length of the second feeding tube 2 may be 800 mm, 850 mm, 900 mm, 950 mm, 1000 mm, 1050 mm, 1100 mm, 1150 mm, 1200 mm, 1250 mm, 1300 mm, 1350 mm, 1400 mm, 1450 mm or 1500 mm.

[0050] See also Figure 2 In one embodiment, the inner diameter of the first feeding pipe 1 is consistent with the inner diameter of the second feeding pipe 2, so that the material in the first feeding pipe 1 can smoothly fall into the second feeding pipe 2. Specifically, the inner diameter of the first feeding pipe 1 and the inner diameter of the second feeding pipe 2 are both in the range of 200mm to 250mm, such as 203mm, 205mm, 208mm, 210mm, 212mm, 215mm, 217mm, 220mm, 221mm, 223mm, 225mm, 227mm, 229mm, 230mm, 232mm, 235mm, 238mm, 240mm, 245mm, etc.

[0051] In addition, the inner diameter of the first feeding pipe 1 is also consistent with the outer diameter of the second feeding pipe 2. Exemplarily, the inner diameter of the first feeding pipe 1 and the outer diameter of the second feeding pipe 2 are both in the range of 240 mm to 290 mm, such as 243 mm, 245 mm, 248 mm, 250 mm, 252 mm, 255 mm, 257 mm, 260 mm, 261 mm, 263 mm, 265 mm, 267 mm, 269 mm, 270 mm, 272 mm, 275 mm, 278 mm, 280 mm, 285 mm, etc.

[0052] See also Figure 1-Figure 4 In one embodiment, a reinforcing pipe section 21 is provided at one end of the second feeding pipe 2 away from the first feeding pipe 1, and the outer diameter of the reinforcing pipe section 21 is greater than the outer diameters of other pipe sections of the second feeding pipe 2. Among them, the end of the second feeding pipe 2 away from the first feeding pipe 1, that is, the lower end of the second feeding pipe 2, is the place with the worst stress conditions and the most vulnerable part. Therefore, by providing the reinforcing pipe section 21 at the end of the second feeding pipe 2 away from the first feeding pipe 1, the strength of the lower end of the second feeding pipe 2 is improved, and the service life of the second feeding pipe 2 is increased. More specifically, the reinforcing pipe section 21 is provided only at the lower end of the second feeding pipe 2, and the rest of the second feeding pipe 2 is not provided with the reinforcing pipe section 21, so that the feeder can save materials and reduce costs while meeting the strength requirements.

[0053] In one embodiment, the ratio of the axial length of the reinforcing pipe section 21 to the other pipe sections of the second feeding pipe 2 is in the range of 1:3.5-1:4. Specifically, the ratio of the axial length of the first feeding pipe 1 to the second feeding pipe 2 may be in the range of 1:3.5, 1:3.6, 1:3.7, 1:3.8, 1:3.9 or 1:4. The axial length of the reinforcing pipe section 21 may be 280mm, 285mm, 290mm, 290mm, 295mm, 298mm, 300mm, 305mm, 310mm, 315mm, 320mm, 325mm, 330mm, 335mm or 340mm. The axial length of the other pipe sections of the second feeding pipe 2 may be 800mm, 850mm, 900mm, 950mm, 1000mm, 1050mm, 1100mm, 1150mm or 1200mm. In addition, the outer diameter range of the reinforced pipe section 21 is 250mm to 300mm, for example, 252mm, 255mm, 257mm, 260mm, 261mm, 263mm, 265mm, 267mm, 269mm, 270mm, 272mm, 275mm, 278mm, 280mm, 285mm, 290mm, etc.

[0054] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0055] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A feeder, characterized in that: include: A first feeding pipe is made of a first material; A second feeding tube, which is a transparent second material, is detachably connected to one axial end of the first feeding tube, and the second feeding tube is coaxial with the first feeding tube; Wherein, the density of the first material part is smaller than the density of the second material part.

2. The feeder according to claim 1, characterized in that The heat resistance of the first material piece is better than the heat resistance of the second material piece.

3. The feeder according to claim 1, characterized in that: The plasticity of the first material piece is better than the plasticity of the second material piece.

4. The feeder according to claim 1, characterized in that: The first feeding tube is a polytetrafluoroethylene tube.

5. The feeder according to claim 1, characterized in that: The second feeding tube is a quartz tube, a silicon carbide tube or a silicon nitride tube.

6. The feeder according to claim 1, characterized in that The first feeding tube and the second feeding tube have different axial lengths.

7. The feeder according to claim 1, characterized in that: The ratio of the axial lengths of the first feeding tube and the second feeding tube is in the range of 1:1.1-1:

2.

8. The feeder according to claim 1, characterized in that The inner diameter of the first feeding pipe is consistent with the inner diameter of the second feeding pipe.

9. The feeder according to claim 1, characterized in that: A reinforced pipe section is disposed at one end of the second feeding pipe away from the first feeding pipe, and the outer diameter of the reinforced pipe section is greater than the outer diameters of other pipe sections of the second feeding pipe.

10. The feeder according to claim 9, characterized in that The ratio of the axial length between the reinforced pipe section and the other pipe sections of the second feeding pipe is in the range of 1:3.5-1:4.

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