A centrifugal vacuum device

Abstract

The application discloses a centrifugal vacuumizing device, which comprises a vacuum tank, a feeding port is installed on the vacuum tank, a cover is installed in the vacuum tank, an inner shell structure with a gradually increased cross section from top to bottom is arranged below the cover, the cover and the inner shell structure are gap-fitted, the upper end of the cover is communicated with the feeding port to form a channel for making paint flow into the vacuum tank through the feeding port, the cover and the inner shell structure in sequence, and the inner shell structure is connected with a driving motor for driving the inner shell structure to rotate and throwing the paint flowing out of the channel onto the inner wall of the vacuum tank. The application is suitable for high-viscosity paint and has the advantages of rapid degassing, high degassing rate and the like.

Description

Technical Field

[0001] This invention relates to the field of vacuum pumping devices, and more particularly to a centrifugal vacuum pumping device. Background Technology

[0002] Automotive polyurethane coatings have high viscosity, making them prone to trapping large amounts of gas during preparation, production, and transfer. This can lead to a decline in the performance of the polyurethane coating film and cause appearance defects. Therefore, degassing treatment is necessary. Traditional stirring or static vacuum degassing techniques are convenient and low-cost, and are often used for coatings with relatively low viscosity. For high-viscosity coatings, the stirring method is generally improved to increase the probability of the coating tumbling to the surface, thereby increasing the contact area between the coating and the vacuum and removing air trapped in the high-viscosity coating. However, problems such as long degassing time and low degassing rate still exist.

[0003] How to solve the above problems has become an urgent technical issue. Summary of the Invention

[0004] The purpose of this invention is to provide a centrifugal vacuum device suitable for high-viscosity coatings, capable of rapid degassing and achieving a high degassing rate.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] The present invention provides a centrifugal vacuum device, comprising a vacuum tank, an inlet installed on the vacuum tank, an outer cover installed inside the vacuum tank, and an inner shell structure with a cross-section gradually increasing from top to bottom covered below the outer cover. The outer cover and the inner shell structure are fitted with a clearance fit, and the upper end of the outer cover is connected to the inlet to form a channel through which the coating material flows sequentially through the inlet, the outer cover, and the outer wall of the inner shell structure into the vacuum tank. The inner shell structure is connected to a drive motor to drive the inner shell structure to rotate and to throw the coating material flowing out of the channel onto the inner wall of the vacuum tank.

[0007] Furthermore, the inner shell structure includes a frustum-shaped film spreading shell with a diameter that gradually increases from top to bottom, and a height-adjustable spreading component. The film spreading shell and the spreading component are sequentially mounted on the output shaft of the drive motor from bottom to top, and both the film spreading shell and the spreading component are clearance-fitted with the outer cover.

[0008] Furthermore, the spreading component includes an integrally formed flat platform and a conical fluid distributor. The fluid distributor is located on the top surface of the flat platform, and both the flat platform and the fluid distributor are clearance-fitted with the outer cover. Additionally, at least one gasket is provided between the flat platform and the spreading housing. The output shaft of the drive motor passes through the spreading housing and the gasket in sequence and is threadedly connected to the flat platform.

[0009] Furthermore, the outer cover includes a cover body, which is disposed on the outside of the inner shell structure and the shape of the inner side of the cover body is adapted to the shape of the inner shell structure and the two are fitted with a gap. Additionally, the upper end of the cover body is connected to a guide pipe, and the two ends of the guide pipe are respectively connected to the feed inlet and the inner side of the cover body.

[0010] Furthermore, the upper end of the fluid distributor is connected to a limiting shaft, and the upper end of the limiting shaft extends into the guide tube and is in clearance fit with the guide tube.

[0011] Furthermore, the film spreading shell, flat platform, fluid distributor, limiting shaft, gasket, cover, and guide tube are all coaxial with the output shaft of the drive motor.

[0012] Due to the adoption of the above structure, the present invention has the following beneficial effects:

[0013] This invention utilizes an inner shell structure with a cross-section that gradually increases from top to bottom. An outer cover fits the inner shell structure with a clearance fit, and the upper end of the outer cover connects to the feed inlet, forming a channel through which the coating material flows sequentially from the feed inlet, through the outer cover, and onto the outer wall of the inner shell structure into the vacuum tank. Simultaneously, a drive motor drives the inner shell structure to rotate axially. Under centrifugal force, the high-viscosity coating material adheres to the outer wall of the inner shell structure and spreads out to form a continuous thin film. This rapidly increases the contact area between the coating material and the vacuum, facilitating the continuous degassing of air mixed in the coating material under vacuum suction. Furthermore, as the coating material flows out of the channel, the degassed material is thrown onto the inner wall of the vacuum tank, flowing slowly down the tank wall to avoid secondary air introduction due to impact from free fall. Finally, the coating material collects at the bottom of the tank and flows out of the vacuum tank. Therefore, this invention is suitable for high-viscosity coatings, enabling continuous and rapid spreading of the coating material to form a thin film in contact with the vacuum, with fast degassing and a high degassing rate.

[0014] The invention will become clearer from the following description, taken in conjunction with the accompanying drawings, which are used to explain embodiments of the invention. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please refer to Figure 1 The present invention provides a centrifugal vacuum device, comprising a vacuum tank 1, an inlet 2 installed on the vacuum tank 1, an outer cover 3 installed inside the vacuum tank 1, and an inner shell structure 4 with a cross-section that gradually increases from top to bottom covering the lower part of the outer cover 3. The outer cover 3 and the inner shell structure 4 are fitted with a clearance fit, and the upper end of the outer cover 3 is connected to the inlet 2 to form a channel through which the coating material flows sequentially through the inlet 2, the outer cover 3, and the outer wall of the inner shell structure 4 into the vacuum tank 1. The inner shell structure 4 is connected to a drive motor 5 to drive the inner shell structure 4 to rotate and to throw the coating material flowing out of the channel onto the inner wall of the vacuum tank 1. During use, the coating material falls sequentially from the inlet 2 and the outer cover 3 onto the inner shell structure 4. As the coating material flows down the outer wall of the inner shell structure 4 under gravity, the drive motor 5 drives the inner shell structure 4 to rotate. Under centrifugal force, the coating material adhering to the outer wall of the inner shell structure 4 spreads out to form a continuous film. Finally, the coating material flows to the bottom of the outer wall of the inner shell structure 4 under gravity and flows out of the channel. Under centrifugal force, it is thrown onto the inner wall of the vacuum tank and flows slowly down the tank wall until it converges at the outlet 4. The cross-section of the inner shell structure 4 gradually increases from top to bottom, and the centrifugal force of the inner shell structure 4 gradually increases from top to bottom. The coating material adhering to the outer wall of the inner shell structure 4 can spread thinner and thinner from top to bottom. Furthermore, the outer cover 3 covering the outer side of the inner shell structure 4 can prevent the coating material from being thrown off the outer wall of the inner shell structure 4 before flowing to the bottom of the inner shell structure 4 due to excessive centrifugal force.

[0019] In this invention, the inner shell structure 4 includes a frustum-shaped spreading shell 41 with a diameter that gradually increases from top to bottom, and a height-adjustable spreading component 42. The spreading shell 41 and the spreading component 42 are sequentially mounted on the output shaft of the drive motor 5 from bottom to top, and both the spreading shell 41 and the spreading component 42 are clearance-fitted with the outer cover 3. The drive motor 5 simultaneously drives the spreading shell 41 and the spreading component 42 to rotate. Under the action of centrifugal force and gravity, the coating is initially spread by the spreading component 42, and then the coating is further rotated and spread into a continuous thin film by the spreading shell 41.

[0020] In this invention, the spreading component 42 includes an integrally formed flat platform 421 and a conical distributor 422. The distributor 422 is located on the top surface of the flat platform 421, and both the flat platform 421 and the distributor 422 are in clearance fit with the outer cover 3. The coating flows through the distributor 422 to the top surface of the flat platform 421 and spreads out. The coating forms a coating layer of uniform thickness through the gap between the flat platform 421 and the outer cover 3. At least one gasket 423 is provided between the flat platform 421 and the spreading housing 41. The output shaft of the drive motor 5 passes through the spreading housing 41 and the gasket 423 in sequence and is threadedly connected to the flat platform 421. By adjusting the number of gaskets 423, the size of the gap between the flat platform 421 and the outer cover 3 can be adjusted, thereby controlling the thickness of the coating layer.

[0021] In this invention, the outer cover 3 includes a cover body 31, which covers the outer side of the inner shell structure 4, and the shape of the inner side of the cover body 31 is adapted to the shape of the inner shell structure 4 with a clearance fit. Furthermore, a guide pipe 32 is connected to the upper end of the cover body 31, and the two ends of the guide pipe 32 are respectively connected to the feed inlet 2 and the inner side of the cover body 31. The guide pipe 32 is fixed to the vacuum tank 1 by a clamp.

[0022] In this invention, the upper end of the fluid distributor 422 is connected to a limiting shaft 424. The upper end of the limiting shaft 424 extends into the guide tube 32 and is in clearance fit with the guide tube 32. This can effectively maintain the axial rotation of the inner shell structure 4 and prevent the upper end of the inner shell structure 4 from tilting when it rotates. The coating can also flow downward from the gap between the limiting shaft 424 and the guide tube 32.

[0023] In this invention, the film spreading shell 41, the flat material table 421, the fluid distributor 422, the limiting shaft 424, the gasket 423, the cover 31, and the guide pipe 32 are all coaxial with the output shaft of the drive motor 5.

[0024] In use, the drive motor 5 simultaneously drives the spreading housing 41, the flat platform 421, the distributor 422, the limiting shaft 424, and the gasket 423 to rotate. The coating material sequentially falls onto the flat platform 421 through the inlet 2, the guide pipe 32, the gap between the limiting shaft 424 and the guide pipe 32, and the gap between the distributor 422 and the cover 31. The coating material spreads on the flat platform 421 and, constrained by the gap between the flat platform 421 and the cover 31, forms a coating layer of uniform thickness. The spread coating material flows to the edge of the flat platform 421 and falls onto the outer wall of the spreading housing 41 under gravity. Under centrifugal force, the coating material adhering to the outer wall of the spreading housing 41 spreads to form a continuous film until it flows out of the channel and is thrown onto the inner wall of the vacuum tank 1. Finally, it slowly flows down the tank wall of the vacuum tank 1 to the bottom of the tank, collects, and flows out of the vacuum tank. Therefore, this invention is suitable for high-viscosity coatings, and can quickly degas with a high degassing rate.

[0025] The preferred embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and the devices and structures not described in detail should be understood as being implemented in a conventional manner in the art. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention using the methods and techniques disclosed above, or modify them into equivalent embodiments with equivalent changes, without departing from the scope of the present invention. This does not affect the essential content of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the present invention's technical solutions still fall within the protection scope of the present invention.

Claims

1. A centrifugal vacuum device comprising a vacuum tank (1) on which a feed inlet (2) is mounted; characterized in that: A cover (3) is installed in the vacuum tank (1), the lower cover of the cover (3) is provided with an inner shell structure (4) with a gradually increasing cross section from top to bottom, the cover (3) and the inner shell structure (4) are gap fitted, and the upper end of the cover (3) is communicated with the feed inlet (2) to form a channel for the paint to flow into the vacuum tank (1) through the feed inlet (2), the cover (3) and the outer wall of the inner shell structure (4) in sequence, and the inner shell structure (4) is connected with a driving motor (5) for driving the inner shell structure (4) to rotate and throwing the paint flowing out of the channel to the inner wall of the vacuum tank (1); the inner shell structure (4) comprises a circular table-shaped film spreading shell (41) with a gradually increasing diameter from top to bottom and a height-adjustable material spreading piece (42), the film spreading shell (41) and the material spreading piece (42) are installed on the output shaft of the driving motor (5) in sequence from bottom to top and gap fitted with the cover (3); the material spreading piece (42) comprises an integrally formed flat material table (421) and a conical flow dividing body (422), the flow dividing body (422) is located on the top surface of the flat material table (421) and gap fitted with the cover (3), and at least one gasket (423) is arranged between the flat material table (421) and the film spreading shell (41), and the output shaft of the driving motor (5) is threadedly connected with the film spreading shell (41), the gasket (423) and the flat material table (421) in sequence; The cover (3) comprises a cover body (31), the cover body (31) is covered on the outer side of the inner shell structure (4), the shape of the inner side of the cover body (31) is matched with the shape of the inner shell structure (4), and the two are gap fitted, the upper end of the cover body (31) is connected with a flow guide pipe (32), and the two ends of the flow guide pipe (32) are respectively communicated with the feed inlet (2) and the inner side of the cover body (31); the flow guide pipe (32) is fixed on the vacuum tank (1) by a clamp.

2. A centrifugal vacuum device according to claim 1, characterized in that: The upper end of the flow dividing body (422) is connected with a limiting shaft (424), and the upper end of the limiting shaft (424) extends into the flow guide pipe (32) and gap fitted with the flow guide pipe (32).

3. A centrifugal vacuum device according to claim 2, characterized in that: The film spreading shell (41), the flat material table (421), the flow dividing body (422), the limiting shaft (424), the gasket (423), the cover body (31) and the flow guide pipe (32) are coaxial with the output shaft of the driving motor (5).

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