A fast cooling screw feeder suitable for vacuum and positive pressure environments

Abstract

The utility model belongs to the technical field of feeding equipment, concretely relates to a fast cooling spiral feeder suitable for vacuum and positive pressure environment, including cylinder, spiral conveying shaft and drive motor, the outer periphery of cylinder is equipped with the cooling water jacket, the first sealing structure is provided with in the feed end of cylinder, the second sealing structure is provided with in the discharge end of cylinder, the first sealing structure and second sealing structure are all used to realize sealing under high temperature, vacuum or positive pressure environment, the differential design of sealing structure is carried out to the different working condition demand of the feed end and discharge end of spiral feeder cylinder in the application, forms the high reliability sealing system, so that the feeder can simultaneously adapt to high temperature, high vacuum and positive pressure process environment, significantly widens the application range. Meanwhile, the cooling system is equipped with in the cylinder outside and spiral shaft inside, can carry out efficient heat exchange from the outer periphery and center of material synchronously, realizes the rapid cooling of high temperature material, and the comprehensive performance is improved significantly.

Description

Technical Field

[0001] This utility model relates to the field of feeding equipment technology, specifically to a fast-cooling screw feeder suitable for vacuum and positive pressure environments. Background Technology

[0002] A screw feeder, also known as a screw conveyor or screw conveyor, is a specialized mechanical device that uses rotating screw blades to propel materials directionally along a closed or open channel. Its core components include a drive unit, screw shaft, blades, channel body, and support system. It can continuously and stably complete the conveying of powders, granules, and small lumps, and is currently widely used in industries such as chemical, food, metallurgy, building materials, and environmental protection.

[0003] In existing technologies, conventional screw feeders are typically designed for operation in atmospheric or near-atmospheric pressure environments. Their structural sealing is generally poor, with simple packing seals, felt seals, or ordinary lip seals used at joints and shaft ends. When such equipment is used in a vacuum (negative pressure) environment, external air can easily be drawn into the system through these weak seals, disrupting the vacuum level and affecting the process flow, such as the stability of vacuum conveying, vacuum drying, and vacuum reactions. Simultaneously, moisture or oxygen in the air may react adversely with the materials inside the feeder. Conversely, when the equipment is used in a positive pressure environment (internal pressure higher than external atmospheric pressure), material dust or process gases inside the equipment can easily leak out through weak seals, causing material loss and environmental pollution, and posing serious safety hazards when conveying flammable, explosive, or toxic materials. Therefore, this application aims to provide a fast-cooling screw feeder suitable for vacuum and positive pressure environments. Utility Model Content

[0004] The purpose of this invention is to address some shortcomings of existing technologies by providing a fast-cooling screw feeder suitable for vacuum and positive pressure environments.

[0005] The technical solution of this utility model is: a fast-cooling screw feeder suitable for vacuum and positive pressure environments, comprising a cylinder, a screw conveying shaft, and a drive motor. End flanges are respectively provided at both ends of the cylinder. The screw conveying shaft is coaxially arranged with the cylinder and is connected to the drive motor. A heat dissipation water jacket is fitted around the outer periphery of the cylinder. A first sealing structure is provided at the feed end of the cylinder, and a second sealing structure is provided at the discharge end of the cylinder. Both the first and second sealing structures are used to achieve sealing under high temperature, vacuum, or positive pressure environments. The first sealing structure includes a vacuum water jacket flange, high-temperature sealing filler, a metal sealing ring, and a vacuum O-ring. The vacuum water jacket flange is bolted to the end flange at the feed end of the cylinder. The metal sealing ring and the vacuum O-ring are sandwiched between the vacuum water jacket flange and the end flange. A limiting baffle is also provided on the inner wall near the feed end of the cylinder. The high-temperature sealing filler fills the space formed by the vacuum water jacket flange, the inner wall of the cylinder, and the limiting baffle.

[0006] Furthermore, the high-temperature sealing filler is a multi-layer heat-insulating and high-temperature resistant asbestos packing.

[0007] Furthermore, the second sealing structure includes a sealing substrate, a high-temperature dustproof component, a skeleton-type vacuum sealing ring, a skeleton-type positive pressure sealing ring, an O-ring sealing component, a compression washer, and a vacuum dustproof sealing flange; the sealing substrate is disposed at the discharge end of the cylinder, and its inner end face is provided with an annular mounting groove surrounding the spiral conveying shaft, and the high-temperature dustproof component, the skeleton-type vacuum sealing ring, the skeleton-type positive pressure sealing ring, the O-ring sealing component, and the compression washer are sequentially housed in the mounting groove from the inside to the outside.

[0008] Furthermore, the high-temperature dustproof component includes a multi-layer high-temperature silicone dustproof stationary ring and a silicone dustproof ring.

[0009] Furthermore, the screw conveyor shaft has an internal cavity, and a cooling sleeve is installed inside the cavity. The cooling medium flows into the cavity from the cooling sleeve and then flows out from one end of the screw conveyor shaft cavity, thereby carrying away heat.

[0010] Furthermore, the discharge end of the cylinder is connected to a discharge pipe, which is equipped with a temperature detection mechanism for real-time feedback of the material cooling degree and a valve for precise control of the discharge opening and closing.

[0011] Furthermore, the valve is a vacuum butterfly valve.

[0012] Furthermore, a water-cooled cavity is formed between the heat dissipation water jacket and the cylinder body. The cooling medium flows in the water-cooled cavity to remove heat. Preferably, the cooling medium is water, and the cooling water flows in the water-cooled cavity from the discharge end of the cylinder body to the feed end.

[0013] Compared with existing technologies, the beneficial effects of this utility model are as follows: This application sets a first sealing structure and a second sealing structure at the inlet and outlet ends of the screw feeder cylinder, respectively. Differentiated designs are implemented to address the different operating conditions at both ends (e.g., the actual pressure and material temperature differ between the inlet and outlet ends; the inlet end requires improved high-temperature resistance, while the outlet end clearly requires stronger dustproofing). This forms a highly reliable sealing system, enabling the feeder to simultaneously adapt to complex and demanding process environments such as high temperature, high vacuum (down to 0.1 Pa), and positive pressure (up to 0.3 MPa), significantly broadening its application range. Furthermore, this application incorporates cooling systems both outside the cylinder and inside the screw shaft, enabling efficient heat exchange simultaneously from the outer periphery and center of the material, achieving rapid cooling of high-temperature materials and significantly improving overall performance. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this utility model; Figure 2 This is a partially enlarged schematic diagram of the first sealing structure of Embodiment 1 of this utility model; Figure 3 This is a partially enlarged schematic diagram of the second sealing structure of Embodiment 1 of this utility model; In the diagram: 1. Cylinder; 11. Feed pipe; 12. Discharge pipe; 13. Limiting baffle; 2. Screw conveyor shaft; 3. Drive motor; 4. Cooling water jacket; 41. Water cooling cavity; 5. First sealing structure; 51. Vacuum water jacket flange; 52. Vacuum O-ring seal; 53. Metal sealing ring; 54. High-temperature sealing packing; 6. Second sealing structure; 61. Vacuum dustproof sealing flange; 62. Sealing substrate; 63. Multi-layer high-temperature silicone dustproof stationary ring; 64. Silicone dustproof ring; 65. Skeleton-type vacuum sealing ring; 66. Skeleton-type positive pressure sealing ring; 67. O-ring seal assembly; 68. Compression washer; 7. Temperature detection mechanism; 8. Vacuum butterfly valve; 9. Cooling jacket. Detailed Implementation

[0015] The present invention will be further described in detail below with reference to specific embodiments. Methods or functional components not specifically described in the embodiments are all prior art. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Example

[0016] like Figure 1-3As shown, this embodiment is a fast-cooling screw feeder suitable for vacuum and positive pressure environments, including a cylinder 1, a screw conveyor shaft 2, and a drive motor 3. End flanges are provided at both ends of the cylinder 1, and an inlet pipe 11 and an outlet pipe 12 are respectively provided at both ends of the cylinder 1. The screw conveyor shaft 2 is coaxially arranged with the cylinder 1 and is connected to the drive motor 3. A heat dissipation water jacket 4 is fitted around the outer periphery of the cylinder 1, forming a water-cooled cavity 41 between the heat dissipation water jacket 4 and the cylinder 1. A first sealing structure 5 is provided at the inlet end of the cylinder 1, and a second sealing structure 6 is provided at the outlet end of the cylinder 1. The first sealing structure 5 and the second sealing structure 6... All six components are used to achieve sealing under high temperature, vacuum, or positive pressure environments. The first sealing structure 5 includes a vacuum water jacket flange 51, a high-temperature sealing packing 54, a metal sealing ring 53, and a vacuum O-ring 52. The vacuum water jacket flange 51 is bolted to the end flange at the feed end of the cylinder 1. The metal sealing ring 53 and the vacuum O-ring 52 are sandwiched between the vacuum water jacket flange 51 and the end flange. A limiting partition 13 is also provided on the inner wall near the feed end of the cylinder 1. The high-temperature sealing packing 54 fills the space formed by the vacuum water jacket flange 51, the inner wall of the cylinder 1, and the limiting partition 13. In this embodiment, the high-temperature sealing packing 54 is a multi-layer heat-insulating and high-temperature resistant asbestos packing.

[0017] In this embodiment, the second sealing structure 6 includes a sealing substrate 62, a high-temperature dustproof component, a skeleton-type vacuum sealing ring 65, a skeleton-type positive pressure sealing ring 66, an O-ring sealing component 67, a compression washer 68, and a vacuum dustproof sealing flange 61; the vacuum dustproof sealing flange 61 is bolted to the corresponding end flange. The sealing substrate 62 is located at the discharge end of the cylinder 1, and its inner end face is provided with an annular mounting groove surrounding the screw conveyor shaft 2. The high-temperature dustproof component, the skeleton-type vacuum sealing ring 65, the skeleton-type positive pressure sealing ring 66, the O-ring sealing component 67, and the compression washer 68 are sequentially housed in the mounting groove from the inside out. The high-temperature dustproof component includes a multi-layer high-temperature silicone dustproof stationary ring 63 and a silicone dustproof ring 64.

[0018] In this embodiment, the cooling medium is water. The water flows in the water-cooled cavity 41 to remove heat, and the flow direction of the cooling water in the water-cooled cavity 41 is from the discharge end of the cylinder 1 to the feed end.

[0019] In this embodiment, the spiral conveyor shaft 2 has a cavity inside, and a cooling sleeve 9 is provided inside the cavity. Cooling water flows into the cavity from the cooling sleeve 9 and then flows out from one end of the cavity of the spiral conveyor shaft 2, thereby carrying away heat.

[0020] In this embodiment, a temperature detection mechanism 7 for real-time feedback of the material cooling level and a vacuum butterfly valve 8 for precise control of the opening and closing of the discharge pipe 12 are provided on the discharge pipe 12.

[0021] The working process of this embodiment is as follows: the high-temperature powder material enters the inside of the cylinder 1 through the feed pipe 11, the drive motor 3 drives the screw conveyor shaft 2 to rotate, and thus drives the powder to move towards the discharge end in the cylinder 1. During the discharge process, the powder can achieve uniform and rapid heat dissipation through the action of the heat dissipation water jacket 4 and the cooling sleeve 9. In addition, the screw feeder in this embodiment has been strengthened and optimized in terms of the sealing structure at both ends, so that the feeder can be used in vacuum (0.1pa) and positive pressure (0.3MPA) environments.

[0022] The above are only some embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model can have various combinations and modifications of the aforementioned technical features. Any improvements, modifications, equivalent substitutions, or applications of the structure or method of the present utility model to other fields to achieve the same effect without departing from the spirit and scope of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A rapid-cooling screw feeder suitable for vacuum and positive pressure environments, comprising a cylinder, a screw conveying shaft, and a drive motor, wherein end flanges are respectively provided at both ends of the cylinder, the screw conveying shaft is coaxially arranged with the cylinder and is drivenly connected to the drive motor, and a heat dissipation water jacket is sleeved on the outer periphery of the cylinder, characterized in that: The feed end of the cylinder is provided with a first sealing structure, and the discharge end of the cylinder is provided with a second sealing structure. Both the first sealing structure and the second sealing structure are used to achieve sealing under high temperature, vacuum or positive pressure environments. The first sealing structure includes a vacuum water jacket flange, a high-temperature sealing packing, a metal sealing ring, and a vacuum O-ring; the vacuum water jacket flange is bolted to the end flange at the feed end of the cylinder, and the metal sealing ring and the vacuum O-ring are sandwiched between the vacuum water jacket flange and the end flange; A limiting baffle is also provided on the inner wall near the feed end of the cylinder, and the high-temperature sealing filler is filled in the space formed by the vacuum water jacket flange, the inner wall of the cylinder and the limiting baffle.

2. The rapid cooling screw feeder suitable for vacuum and positive pressure environments according to claim 1, characterized in that: The high-temperature sealing filler is a multi-layer heat-insulating and high-temperature resistant asbestos packing.

3. The rapid cooling screw feeder suitable for vacuum and positive pressure environments according to claim 1, characterized in that: The second sealing structure includes a sealing substrate, a high-temperature dustproof component, a skeleton-type vacuum sealing ring, a skeleton-type positive pressure sealing ring, an O-ring sealing component, a compression washer, and a vacuum dustproof sealing flange; The sealing substrate is located at the discharge end of the cylinder, and its inner end face is provided with an annular mounting groove surrounding the spiral conveyor shaft. The high-temperature dustproof component, skeleton-type vacuum sealing ring, skeleton-type positive pressure sealing ring, O-ring sealing component and compression washer are sequentially housed in the mounting groove from the inside to the outside.

4. The rapid cooling screw feeder suitable for vacuum and positive pressure environments according to claim 3, characterized in that: The high-temperature dustproof component includes a multi-layer high-temperature silicone dustproof stationary ring and a silicone dustproof ring.

5. The rapid cooling screw feeder suitable for vacuum and positive pressure environments according to claim 3, characterized in that: The spiral conveyor shaft has an internal cavity, and a cooling sleeve is installed inside the cavity. The cooling medium flows into the cavity from the cooling sleeve and flows out from one end of the spiral conveyor shaft, thereby carrying away heat.

6. The rapid cooling screw feeder suitable for vacuum and positive pressure environments according to claim 1, characterized in that: The discharge end of the cylinder is connected to a discharge pipe, which is equipped with a temperature detection mechanism for real-time feedback of the material cooling degree and a valve for precise control of the discharge opening and closing.

7. The rapid cooling screw feeder suitable for vacuum and positive pressure environments according to claim 6, characterized in that: The valve is a vacuum butterfly valve.

8. The rapid cooling screw feeder suitable for vacuum and positive pressure environments according to claim 1, characterized in that: A water-cooled cavity is formed between the heat dissipation water jacket and the cylinder, and the cooling medium flows in the water-cooled cavity to remove heat.

9. The rapid cooling screw feeder suitable for vacuum and positive pressure environments according to claim 8, characterized in that: The cooling medium is water, and the cooling water flows from the discharge end of the cylinder to the feed end in the water-cooled cavity.

Images