Granular solid material flow rate controller

Abstract

The utility model discloses a granular solid material flow rate controller which comprises an upper valve body and a lower valve body which are connected to form a middle cavity, and an upper material port flow channel and a lower material port flow channel respectively penetrate through the upper valve body and the lower valve body to be connected to the middle cavity; a bearing disc is arranged in the middle cavity, a preset distance is formed between the bearing disc and a lower end opening of the feeding opening runner, and the bearing disc is fixed through a torsion arm. A valve rod penetrating through the upper valve body is connected with the torsion arm, and a valve actuator is arranged on the upper portion of the valve rod. A packing set is installed on the outer side wall of the valve rod. Therefore, the problems that the inner surface and a lining pipe metal material through which materials flow pollute a product, the self-control program configuration verification is difficult due to the small rotation angle of a torsion arm caused by the too large component material bearing disc in the cavity, and frequent blockage caused by particle aggregation due to the too steep concave edge angle of the component material bearing disc in the cavity are avoided; and a connecting device of the bearing disc and the torsion arm in the cavity is easy to loosen and fall off to cause foreign matters and pollution in a product package.

Description

Technical Field

[0001] This utility model relates to the field of machinery, and in particular to a flow rate controller for granular solid materials. Background Technology

[0002] The silane fluidized bed technology for producing granular silicon has significant advantages in all aspects. Fluidized bed reactors provide high and large production volumes with relatively low energy consumption, and the product is granular silicon that can be packaged and sold without further processing. It has a high degree of automation, which greatly reduces production costs. Furthermore, the product specifications can reach not only solar-grade but also electronic-grade, enabling it to connect with downstream industries.

[0003] Among them, the particulate solid material flow rate controller plays a key role in the operation of silane fluidized bed production of granular silicon technology. It is a key device for controlling the bed height of the fluidized bed reactor. The control of silicon particle flow rate has a significant impact on the bottom temperature of the fluidized bed reactor. At the same time, the flow channel cavity of the particulate solid material flow rate controller is in direct contact with the silicon particle product, which can contaminate the product. Therefore, its manufacturing materials and manufacturing process have very high requirements.

[0004] In the process of realizing this utility model, it was found that the upper and lower channels, cavities and internal components of the existing granular solid material flow rate controller are all made of metal, which causes a large amount of metal impurities and contaminates the product. In addition, the internal components of the granular solid material flow rate controller are too large and the rotation angle of the connecting torsion arm is small, which is not conducive to the configuration and verification of the automatic control program. Furthermore, the concave edge angle of the material tray of the internal component of the granular solid material flow rate controller is too steep, resulting in frequent jamming. Moreover, the connection device between the tray and the torsion arm is prone to loosening and falling off. Utility Model Content

[0005] In view of this, the present invention provides a flow rate controller for granular solid materials, which can avoid contamination of the product by the inner surface and the metal material of the liner through which the material flows, and avoid the technical problems of the material support tray of the cavity being too large, resulting in a small rotation angle of the torsion arm and difficulty in configuring and verifying the automatic control program, as well as avoiding the technical problems of the material support tray of the cavity having a concave edge angle that is too steep, causing frequent particle aggregation and jamming, and the connection device between the support tray and the torsion arm being easy to loosen and fall off, resulting in foreign objects and contamination in the product packaging.

[0006] To achieve the above objectives, an embodiment of the present invention provides a flow rate controller for granular solid materials, including a valve actuator, a packing assembly, a valve stem, an upper valve body, a support tray, a torsion arm, a lower valve body, an inlet channel, an intermediate cavity, and an outlet channel;

[0007] The upper valve body and the lower valve body are connected to form an intermediate cavity, and the feed port flow channel and the discharge port flow channel penetrate the upper valve body and the lower valve body respectively to connect to the intermediate cavity; the intermediate cavity has a support tray with a preset distance from the lower port of the feed port flow channel, and the support tray is fixed by a torsion arm; the valve stem penetrates the upper valve body and is connected to the torsion arm, and a valve actuator is provided on the upper part of the valve stem; a packing group to prevent packing leakage is installed on the outer wall of the valve stem.

[0008] Optionally, it includes:

[0009] The feed inlet channel and the discharge inlet channel are arranged opposite to each other;

[0010] The support tray is positioned between the opposite feed inlet channel and the discharge inlet channel, and the distance between the support tray and the feed inlet channel is less than the distance between the support tray and the discharge inlet channel.

[0011] Optionally, it includes:

[0012] The pallet is connected to the torsion arm by pallet fastening screws and is also secured by metal wire;

[0013] The torsion arm is connected to the valve stem via a torsion arm set screw and a torsion arm screw.

[0014] Optionally, it includes:

[0015] The inner and outer surfaces of the torsion arm are covered with a protective coating.

[0016] The inner and outer surfaces of the tray are covered with a protective coating;

[0017] Both the feed inlet and discharge inlet channels are made of non-metallic material sleeves.

[0018] Optionally, it includes: the tray has a recessed portion inside, and the edge of the recessed portion is provided with a preset tilt angle.

[0019] Optionally, a sealing gasket is provided at the connection between the upper valve body and the lower valve body.

[0020] Optionally, the packing assembly includes a plurality of packing rings and a packing pressure plate, wherein the plurality of packing rings are obliquely cut and staggered and installed on the outer side wall of the valve stem, and a packing pressure plate is provided on the top of the staggered packing rings.

[0021] Optionally, the packing pressure plate is provided with a pre-tightening bolt, and the pre-tightening bolt is provided with a butterfly spring to provide a continuous pre-tightening force.

[0022] Optionally, the valve stem is supported by dual bearings and features an anti-flyout design.

[0023] Optionally, it includes:

[0024] An upper valve body flow channel liner is installed outside the feed port flow channel;

[0025] The lower valve body flow channel liner is installed outside the discharge port flow channel.

[0026] One embodiment of the above-mentioned utility model has the following advantages or beneficial effects: The present utility model provides a flow rate controller for granular solid materials, which realizes the control of the outflow velocity of product particles at the bottom of the fluidized bed reactor, so as to control the height of the reactor bed, and requires that the granular products flowing through the controller avoid metal contamination and controller jamming. At the same time, while controlling the flow rate of granular solid materials, it can reduce or avoid the contamination of normal products by the inner surface metal material, and greatly reduce the jamming caused by the aggregation of large particles.

[0027] The further effects of the aforementioned unconventional alternative methods will be explained below in conjunction with specific implementation methods. Attached Figure Description

[0028] The accompanying drawings are provided to better understand this utility model and do not constitute an undue limitation thereof. Wherein:

[0029] Figure 1 This is a schematic diagram of the flow rate controller for granular solid materials according to an embodiment of the present invention. Detailed Implementation

[0030] The following description, in conjunction with the accompanying drawings, illustrates exemplary embodiments of the present invention, including various details to aid understanding. These embodiments should be considered merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present invention. Similarly, for clarity and brevity, descriptions of well-known functions and structures are omitted in the following description.

[0031] At least one embodiment of this utility model provides a flow rate controller for granular solid materials, such as... Figure 1 As shown, the granular solid material flow rate controller may include a valve actuator 14, a packing assembly 12, a valve stem 11, an upper valve body 9, a support tray 5, a torsion arm 3, a lower valve body 1, an inlet channel 15, an intermediate cavity 16, and an outlet channel 17. In an embodiment, the upper valve body 1 and the lower valve body 9 are connected to form the intermediate cavity 16, and the inlet channel 15 and the outlet channel 17 penetrate the upper valve body 1 and the lower valve body 9, respectively, and connect to the intermediate cavity 16. The intermediate cavity 16 contains a support tray 5 at a predetermined distance from the lower port of the inlet channel 15, and the support tray 5 is fixed by the torsion arm 3. The valve stem 11, which penetrates the upper valve body 1, is connected to the torsion arm 3, and a valve actuator 14 is provided on the upper part of the valve stem 11. A packing assembly 12 is installed on the outer wall of the valve stem 11.

[0032] In a preferred embodiment, the feed inlet channel 15 and the discharge inlet channel 17 are arranged opposite to each other, and the support tray 5 is arranged between the opposite feed inlet channel 15 and the discharge inlet channel 17, and the distance between the support tray 5 and the feed inlet channel 15 is less than the distance between the support tray 5 and the discharge inlet channel 17.

[0033] The packing assembly 12 on the outer wall of the valve stem 11 can be a multi-combination packing of various forms, without specific limitations. It effectively prevents external leakage due to packing wear and meets EPA and TA-LUFT requirements. In a further embodiment, the packing assembly may include multiple packing rings and a packing pressure plate 13. The multiple packing rings are obliquely cut and staggered on the outer wall of the valve stem 11, and a packing pressure plate 13 is provided on top of the staggered packing rings. Furthermore, the packing pressure plate 13 is equipped with bolt pre-tightening, and the bolts use butterfly springs to provide continuous pre-tightening force, providing a continuous and stable pre-tightening force for the packing, effectively compensating for temperature and pressure fluctuations and packing wear. It is worth noting that when the multiple packing rings are obliquely cut and staggered, the bolts of the packing pressure plate 13 need to be tightened layer by layer with pressure, and space is reserved for the movement and break-in of the valve stem 11 to achieve a dynamic sealing function.

[0034] In some other embodiments of this utility model, a sealing gasket 8 is provided at the connection between the upper valve body 9 and the lower valve body 1. In a preferred embodiment, the sealing gasket 8 is a middle flange sealing gasket, and the middle seal adopts a concave-convex surface form. This structure can achieve effective positioning while ensuring sealing, so that the feed inlet channel 15 and the discharge inlet channel 17 are concentric, and prevent local erosion problems caused by deviation.

[0035] As a further embodiment, the support tray 5 is connected to the torsion arm 3 through holes in the support tray fastening screw 4, and is secured with metal wire to prevent it from falling off (i.e., to prevent screws or the like from loosening and falling into the material). In addition, the torsion arm 3 is connected to the valve stem 11 through holes in the torsion arm set screw 6 and the torsion arm screw 7.

[0036] It should be noted that the pallet 5 is made of metals such as Stellite and nickel-chromium alloys, or non-metallic materials such as silicon carbide and carbon ceramics. The materials used must meet the product purity requirements. For example, the pallet 5 can be oval or round.

[0037] In a further embodiment, a short torsion arm 3 with two connected sections is used to fix the tray 5, which allows the tray 5 to move left and right, controlling the outflow of particulate material.

[0038] It is worth noting that the torsion arm 3, bearing plate fastening screw 4, torsion arm set screw 6, torsion arm screw 7, and valve stem 11 can all be coated, which has the characteristics of being resistant to erosion and preventing contamination of the medium.

[0039] In another preferred embodiment, the valve stem 11 is supported by double bearings to ensure its verticality, and the valve stem 11 is designed to prevent it from flying out. In a further embodiment, a rocker arm is rigidly connected inside the valve body of the valve stem 11, and the rocker arm's shape is larger than the packing hole, effectively preventing the valve stem from being blown out.

[0040] In some preferred embodiments, the inner and outer surfaces of the torsion arm 3 of this invention are covered with a protective coating, which can reduce or eliminate contamination caused by contact between granular polycrystalline silicon and the torsion arm. Furthermore, the inner and outer surfaces of the support tray 5 are covered with a protective coating, which can reduce or eliminate contamination caused by contact between granular polycrystalline silicon and the support tray. In a preferred embodiment, the thickness of the protective coating can range from 0.2 mm to 0.9 mm.

[0041] In some embodiments of this utility model, the feed inlet channel 15 of the granular solid material flow rate controller of this utility model is provided with an upper valve body flow channel liner 10, and the discharge inlet channel 17 is provided with a lower valve body flow channel liner 2.

[0042] Preferably, the support tray 5 and the upper valve body flow channel liner 10 maintain an appropriate distance to cut off the material flow through the accumulation of granular solid materials. For example, this distance can be constructed using discrete element numerical modeling (DEM) to simulate the material particles. The simulated particle angle of repose under natural accumulation is then compared with the actual material angle of repose. After verification, a physical valve body model is constructed, material particles are added, and leakage under different structural conditions is simulated using simulation software such as MatDEM and EDEM. The optimal value is then obtained.

[0043] Furthermore, both the upper valve body flow channel liner 10 and the lower valve body flow channel liner 2 are made of non-metallic materials, which can reduce or eliminate contamination caused by contact with granular polycrystalline silicon. Of course, it is not ruled out that the upper valve body flow channel liner 10 and the lower valve body flow channel liner 2 can be made of metallic materials.

[0044] In a further embodiment, the present invention uses an integrally sintered non-metallic SiC (silicon carbide) upper valve body flow channel liner 10, lower valve body flow channel liner 2, support tray 5, and torsion arm 3 to prevent the introduction of metal impurities into normal products, thus avoiding contamination of normal products with metal impurities.

[0045] It should be noted that all parts of this invention that come into contact with the product are coated with a SiC (silicon carbide) coating (examples include, but are not limited to, composite protective coatings of "metal-based + non-metal" such as "nickel-chromium-based + silicon" and "Stellitium + silicon" and special non-metallic protective coatings such as "silicon carbide CVD coating") to isolate them from the product, thereby preventing the introduction of metallic impurities into the product and causing significant contamination in the test results regarding metallic impurities.

[0046] In some further embodiments of this utility model, the tray 5 has a recessed portion inside, and the edge of the recessed portion is provided with a preset inclined angle, so as to block granular solid materials, form a certain accumulation height, and cover the inlet and outlet.

[0047] The edge inclination angle of the recessed part of the support tray 5 directly affects the solid particle aggregation effect. Configuring an appropriate edge inclination angle makes it easier for solid particles to be extruded from the support tray, avoiding particle aggregation and blockage of the connection between the feed inlet channel 15, the discharge inlet channel 17 and the support tray 5, thus preventing jamming. This improves the feeding stability of granular silicon products, facilitates stable control of the reactor bed height, and reduces or eliminates metal contamination caused by product contact with metal materials.

[0048] In a further embodiment, the tray 5 (e.g., an elliptical meniscus) can be installed in the opposite direction, with an inverted triangular V-shaped notch cut in the middle of the straight plate to control the flow rate of smaller particle solid materials.

[0049] In a further embodiment, the tray 5 employs a V-shaped valve. Through flow capacity calculations and finite element fluid simulation-assisted design, an adjustment accuracy of over 0.1% can be achieved for high-hardness solid granular materials with particle sizes ranging from 0.149 mm to 3 mm. Furthermore, by reversing the V-shaped tray 5 by 180°, and through flow capacity calculations and finite element fluid simulation-assisted design, an adjustment accuracy of over 0.1% can be achieved, again suitable for high-hardness solid granular materials with particle sizes greater than 3 mm.

[0050] In a preferred embodiment, the shape of the tray 5 can be optimized from an elliptical meniscus to a smaller, more space-saving circular plate, increasing the rotation angle of the torsion arm and facilitating program configuration and loading.

[0051] In summary, the granular solid material flow rate controller of this utility model can stably control the material outflow velocity at the bottom of the reactor, providing a reliable guarantee for the stable adjustment of the reactor bed height. Furthermore, the coating on the outer surface of the internal components, the use of non-metallic sleeves for the material inlet and outlet channels, and the recessed design of the non-metallic material for the internal support tray ensure that solid particles can be smoothly cut off during the feeding process and that the reduced tilt angle prevents accumulation and blockage of the inlet and outlet ports and the rotation of the tray.

[0052] The specific embodiments described above do not constitute a limitation on the scope of protection of this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can occur depending on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A flow rate controller for granular solid materials, characterized in that, include: Valve actuator, packing assembly, valve stem, upper valve body, bearing plate, torsion arm, lower valve body, feed port passage, intermediate cavity and discharge port passage; The upper valve body and the lower valve body are connected to form an intermediate cavity, and the feed inlet channel and the discharge inlet channel pass through the upper valve body and the lower valve body respectively to connect to the intermediate cavity; The intermediate cavity contains a support tray at a preset distance from the lower end of the feed inlet channel, and the support tray is fixed by a torsion arm. The valve stem, which penetrates the upper valve body, is connected to the torsion arm, and a valve actuator is installed on the upper part of the valve stem; A packing assembly is installed on the outer wall of the valve stem to prevent packing leakage.

2. The flow rate controller for granular solid materials according to claim 1, characterized in that, include: The feed inlet channel and the discharge inlet channel are arranged opposite to each other; The support tray is positioned between the opposite feed inlet channel and the discharge inlet channel, and the distance between the support tray and the feed inlet channel is less than the distance between the support tray and the discharge inlet channel.

3. The flow rate controller for granular solid materials according to claim 1, characterized in that, include: The pallet is connected to the torsion arm by pallet fastening screws and is also secured by metal wire; The torsion arm is connected to the valve stem via a torsion arm set screw and a torsion arm screw.

4. The flow rate controller for granular solid materials according to claim 1, characterized in that, include: The inner and outer surfaces of the torsion arm are covered with a protective coating. The inner and outer surfaces of the tray are covered with a protective coating; Both the feed inlet and discharge inlet channels are made of non-metallic material sleeves.

5. The flow rate controller for granular solid materials according to claim 1, characterized in that, include: The tray has a recessed portion inside, and the edges of the recessed portion are set with a preset tilt angle.

6. The flow rate controller for granular solid materials according to claim 1, characterized in that, include: A sealing gasket is provided at the connection between the upper valve body and the lower valve body.

7. The flow rate controller for granular solid materials according to claim 1, characterized in that, include: The packing assembly includes multiple packing rings and a packing pressure plate. The multiple packing rings are obliquely cut and staggered and installed on the outer wall of the valve stem. A packing pressure plate is provided on the top of the staggered packing rings.

8. The flow rate controller for granular solid materials according to claim 7, characterized in that, include: The packing pressure plate is equipped with bolt preload, and the bolts are provided with continuous preload force by a butterfly spring.

9. The flow rate controller for granular solid materials according to claim 1, characterized in that, include: The valve stem is supported by dual bearings and features an anti-flyout design.

10. The flow rate controller for granular solid materials according to any one of claims 1-9, characterized in that, include: An upper valve body flow channel liner is installed outside the feed port flow channel; The lower valve body flow channel liner is installed outside the discharge port flow channel.

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