Slurry deaerator, rotating degassing element, and slurry deaeration method

Abstract

This invention belongs to the field of slurry processing equipment, specifically relating to a slurry degassing machine, a rotary degassing component, and a slurry degassing method. The slurry degassing machine includes a housing, a rotary drive device, and a degassing device. The housing has a cavity, and the rotary drive device is mounted on the housing. The degassing device includes a feed pipe and a rotary degassing component. The rotary degassing component is mounted on the rotating shaft of the rotary drive device and is located within the cavity. The rotary degassing component has a rotating channel connected to the feed pipe. In the axial projection direction of the rotary degassing component, the two opposite sides of the inner circumferential wall of the rotating channel are bent towards each other to form a curved surface structure. A spiral groove is provided at the curved surface structure, extending circumferentially. This slurry degassing machine is suitable for degassing high-viscosity slurries. It can maintain the intrinsic structural stability of the slurry under low-speed operation of the rotary degassing component while actively reconstructing the flow field from the perspective of flow channel geometry, thereby effectively improving degassing efficiency and degassing degree.

Description

Technical Field

[0001] This invention belongs to the field of slurry processing equipment, specifically relating to a slurry degassing machine, a rotary degassing component, and a slurry degassing method. Background Technology

[0002] Lithium-ion batteries have become the primary energy source for consumer electronics due to their high energy density, long cycle life, and environmental friendliness. With the development of electric vehicles and large-scale energy storage, battery cells need to be connected in series and parallel to form battery banks to meet power demands. However, insufficient consistency between individual cells can lead to the overall performance of the battery pack being limited by the weakest link cell, causing serious safety issues such as localized overcharging, over-discharging, and even thermal runaway.

[0003] The fundamental guarantee of battery consistency lies in manufacturing electrode sheets with high yield and high reliability. In the electrode coating process, air bubbles introduced into the positive and negative electrode slurries during preparation or transportation are a key factor leading to exposed foil areas on the coating surface, decreased adhesion of the active material layer, and even detachment. Therefore, how to efficiently remove air bubbles from the slurry before coating has become a common technical challenge for improving the consistency and safety of lithium batteries.

[0004] Existing industrial degassing technologies are mainly divided into two categories: static degassing and dynamic degassing. Static degassing relies on prolonged static placement to allow bubbles to rise naturally. While this avoids mechanical disturbance, the processing cycle is long and difficult to match with continuous production cycles. Dynamic degassing, on the other hand, uses high-speed centrifugation combined with vacuum negative pressure to force bubble separation. Although this significantly shortens the degassing time, its strong shear force can easily cause the molecular chains of polymer binders (such as CMC / SBR) in the slurry to break, leading to a decrease in slurry viscosity and a deterioration in sedimentation stability.

[0005] Existing technologies also mention the use of ultrasonic degassing. Ultrasonic degassing utilizes the cavitation effect generated by high-frequency vibration in the slurry, causing tiny bubbles dissolved or dispersed in the slurry to rapidly aggregate, grow, and float to the surface, thus achieving degassing. This technology has the advantages of good degassing effect and high degassing efficiency, and is especially suitable for rapid degassing of low-viscosity slurries. When the slurry viscosity is too high, the cohesive force inside the slurry increases significantly, and the fluidity decreases. The cavitation effect of ultrasound cannot be effectively transmitted to the deep layers of the slurry, resulting in bubbles not being able to fully aggregate and escape, making it difficult to achieve the ideal complete degassing effect and affecting the quality of subsequent products. On the other hand, ultrasonic degassing equipment has high energy consumption, and long-term operation will lead to a significant increase in production costs, especially when processing large batches or high-viscosity slurries, where energy consumption is even more prominent, thus restricting its widespread application in large-scale industrial production. Summary of the Invention

[0006] The purpose of this invention is to provide a slurry degassing machine suitable for high-viscosity slurries, which can effectively improve degassing efficiency while taking into account the intrinsic structural stability of the slurry.

[0007] The following technical solutions are used to achieve the above objectives.

[0008] The first aspect of the present invention provides a slurry degassing machine, the slurry degassing machine comprising an outer shell, a rotary drive device, and a degassing device;

[0009] The outer shell has a cavity, and the rotary drive device is disposed on the outer shell;

[0010] The degassing device includes a feed pipe and a rotary degassing component; the rotary degassing component is disposed on the rotating shaft of the rotary drive device and is located inside the cavity;

[0011] The rotary degassing component has a rotating channel connected to the feed pipe. In the axial projection direction of the rotary degassing component, the rotary degassing component bends towards each other on opposite sides of the inner peripheral wall of the rotating channel to form a curved surface structure. The curved surface structure is provided with a spiral groove that is circumferentially arranged.

[0012] In some embodiments, the curved surface structure of the rotary degassing component is formed by rotating a curved generatrix around the axis of the rotary degassing component; the functional form of the generatrix is:

[0013] ;

[0014] in, ;

[0015] z is the axial coordinate;

[0016] r(z) is the radial distance of the generatrix at point z;

[0017] R0 is the reference radius;

[0018] z c The axial coordinate of the center of the saddle-shaped region;

[0019] A is the amplitude coefficient of the hyperbolic cosine term;

[0020] L is the characteristic length of the hyperbolic cosine;

[0021] B is the amplitude coefficient of the Gaussian term;

[0022] σ is the standard deviation of the Gaussian term.

[0023] In some embodiments, the rotary degassing component includes an upper section, a middle section, and a lower section connected sequentially along the axial direction; the upper section, the middle section, and the lower section are smoothly transitioned and sequentially connected to form the rotary channel;

[0024] The inner peripheral wall of the middle section is a curved surface structure, and the spiral groove is provided at the curved surface structure; the radial cross-sectional area of ​​the lower section increases axially from the first end near the middle section to the second end away from the middle section.

[0025] In some embodiments, the opposite sides of the lower segment are straight structures in the axial projection direction of the lower segment.

[0026] In some embodiments, the radial cross-sectional area of ​​the upper segment increases axially from a first end near the middle segment to a second end away from the middle segment, and the opposite sides of the upper segment are straight structures in the axial projection direction of the upper segment.

[0027] In some embodiments, the feed pipe includes a main feed pipe and a plurality of branch pipes; the rotating shaft of the rotary drive device is provided with an axial mounting hole, and the main feed pipe is inserted into the mounting hole; the rotary degassing component is provided with a connecting plate, and the rotating shaft of the rotary drive device is connected to the connecting plate; the rotating shaft is provided with a plurality of radial holes communicating with the mounting hole in the radial direction, the first end of the branch pipe passes through the radial holes and communicates with the main feed pipe, and the second end of the branch pipe passes through the connecting plate and communicates with the rotating channel.

[0028] In some embodiments, the second end of the dispensing pipe is bent, and the opening of the second end of the dispensing pipe faces the sidewall of the rotating degassing member.

[0029] In some embodiments, the number of spiral grooves is at least one, and the groove depth is 0.5mm~2mm, the groove width is 1mm~5mm, and the spiral angle is 0.1°~0.2°.

[0030] A second aspect of the present invention provides a rotary degassing component, the rotary degassing component comprising an upper section, a middle section, and a lower section connected sequentially along an axial direction; the upper section, the middle section, and the lower section are smoothly transitioned and sequentially connected to form a rotation channel;

[0031] In the axial projection direction of the rotating degassing component, the middle section bends towards each other on opposite sides of the inner peripheral wall of the rotating channel to form a curved surface structure, and a spiral groove is provided at the curved surface structure;

[0032] The radial cross-sectional area of ​​the lower segment increases axially from the first end near the middle segment to the second end away from the middle segment.

[0033] A third aspect of the present invention provides a method for degassing slurry, the method comprising the following steps:

[0034] The rotary drive device is controlled to drive the rotary deaerator to rotate, and the slurry to be deaerated is fed into the rotating deaerator through the feed pipe.

[0035] Under the combined action of gravity and centrifugal force, the slurry to be degassed flows along the rotating channel of the rotating degassing component. When it flows to the curved structure of the rotating channel, the curved structure shrinks the cross-sectional area of ​​the flow channel and suppresses the axial flow velocity of the slurry to be degassed, so that microbubbles are enriched and merged in the near-wall area and overflow. The spiral groove at the curved structure can guide the slurry to be degassed to form a downward spiral flow liquid film, which peels the attached bubbles off the slurry.

[0036] The technical solution provided by this invention has the following advantages and effects:

[0037] This slurry degassing machine uses a rotating degassing component mounted on a rotating drive unit. The rotating degassing component is connected to the feed pipe and located within a vacuum chamber. This allows the slurry to be degassed to enter the rotating channel of the degassing component under the combined action of centrifugal force and its own gravity when flowing into the component through the feed pipe. Combined with the specific spiral grooves on the inner wall of the rotating channel and the opposing curved surface structure design of the rotating degassing component, it can synergistically degas the slurry. The bidirectional curved surface structure allows the cross-sectional area of ​​the flow channel to shrink, thus axially... The localized reduction in flow velocity causes microbubbles to accumulate and merge in the near-wall region, transforming into larger bubbles that quickly escape. The specific shape of the spiral groove acts on the flowing slurry to form a spiral secondary vortex, efficiently peeling off attached bubbles and transporting them to the central low-pressure zone. Furthermore, the spiral groove extends the material's flow path, increasing defoaming time. Therefore, this slurry defoamer is suitable for defoaming high-viscosity slurries. It can maintain the intrinsic structural stability of the slurry while operating at low speeds with the rotating degassing component, and actively reconstruct the flow field from the perspective of flow channel geometry to effectively improve defoaming efficiency and degree. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the overall structure of the slurry degassing machine according to an embodiment of the present invention;

[0039] Figure 2 This is a longitudinal cross-sectional structural diagram of the slurry degassing machine according to an embodiment of the present invention;

[0040] Figure 3 This is a longitudinal cross-sectional structural diagram of the rotary degassing component according to an embodiment of the present invention;

[0041] Figure 4 This is a schematic diagram of the longitudinal cross-sectional structure of the middle section of an embodiment of the present invention.

[0042] Explanation of reference numerals in the attached figures:

[0043] 100. Slurry degassing machine;

[0044] 1. Outer shell; 11. Cavity; 12. First cylinder; 13. Second cylinder; 2. Rotary drive device; 21. Rotary shaft; 211. Mounting hole; 3. Degassing device; 31. Feed pipe; 311. Main feed pipe; 312. Distributor pipe; 32. Rotary degassing component; 321. Rotation channel; 322. Spiral groove; 323. Curved surface structure; 324. Upper section; 325. Middle section; 326. Lower section; 327. Connecting plate; 4. Fixing frame. Detailed Implementation

[0045] To facilitate understanding of the present invention, specific embodiments of the present invention will be described in more detail below with reference to the accompanying drawings.

[0046] Unless otherwise specified or defined, the terms "first," "second," etc., used in this document are for distinguishing names only and do not represent a specific number or order.

[0047] Unless otherwise stated or defined, the term “and / or” as used herein includes any and all combinations of one or more of the related listed items.

[0048] It should be noted that in this article, "fixed to" or "connected to" can mean directly fixed to or connected to a component, or indirectly fixed to or connected to a component.

[0049] It should be noted that in this embodiment, the slurry deaerator 100 is mainly used for deaerating slurries of various viscosities, especially suitable for deaerating high-viscosity slurries such as lithium battery slurries. Of course, in other embodiments, the slurry deaerator 100 is also applicable to the deaeration of pigment slurries and coating slurries in the chemical industry, high-concentration fruit juices and sauces in the food industry, and gel-like ointments and suspensions in the pharmaceutical industry, as long as the material to be treated has certain rheological properties, it can be applied, and no special limitations are made here.

[0050] This invention provides a slurry degassing machine 100, such as... Figures 1 to 4 As shown, the slurry degassing machine 100 includes an outer shell 1, a rotary drive device 2, and a degassing device 3.

[0051] The outer casing 1 has a cavity 11, which can be evacuated to create a vacuum environment during degassing to assist the degassing device 3 in degassing. The rotary drive device 2 is mounted on the outer casing 1. The degassing device 3 includes a feed pipe 31 and a rotary degassing component 32; the rotary degassing component 32 is mounted on the rotating shaft 21 of the rotary drive device 2 and is located inside the cavity 11; the rotary degassing component 32 has a rotating channel 321 connected to the feed pipe 31. It should be noted that the rotary degassing component 32 has an inlet end for slurry inflow and an outlet end for slurry outflow, wherein the feed pipe 31 is correspondingly located at the inlet end of the rotary degassing component 32.

[0052] In the axial projection direction of the rotating degassing member 32, the rotating degassing member 32 bends towards each other on opposite sides of the inner peripheral wall of the rotating channel 321 to form a curved surface structure 323. Both opposite sides of the rotating degassing member 32 protrude towards the central axis of the rotating degassing member 32 to form a saddle-shaped structure. A spiral groove 322 is provided at the curved surface structure 323, extending circumferentially. Understandably, the rotating degassing component 32 corresponds to the saddle shape of the inner peripheral wall of the rotating channel 321, which is bidirectionally curved in the axial direction. The inner peripheral wall of the saddle-shaped region is provided with a spiral groove 322 that is circumferentially arranged. When the slurry enters the region of the spiral groove 322 through the rotating channel 321, on the one hand, the bidirectionally curved surface structure 323 can cause the cross-sectional area of ​​the flow channel to shrink, resulting in a local reduction in axial flow velocity. Microbubbles are enriched and merged in the near-wall region, becoming larger bubbles. Under the action of vacuum, the bubbles overflow rapidly. On the other hand, the specific shape of the spiral groove 322 can act on the flowing slurry. Under the premise of maintaining the central symmetry of the overall flow field, a pair of centrally symmetrically distributed spiral secondary vortices are generated in the cross-section of the rotating channel 321. This can effectively prevent the rotating degassing component 32 from swaying due to asymmetry during rotation, ensuring that the slurry always flows along the inner wall of the rotating degassing component 32. The spiral secondary vortex can generate a radial velocity component pointing towards the center of rotation in the near-wall region of the rotating channel 321. Together with the centrifugal buoyancy generated by the rotation, it can efficiently peel off the attached bubbles and transport them to the central low-pressure area. Furthermore, the spiral groove 322 can make the material flow path longer and the material stays in the cavity 11 for a longer time, thus increasing the defoaming time.

[0053] The present invention also provides a slurry degassing method based on the slurry degassing machine 100, comprising the following steps:

[0054] The rotary drive device 2 is controlled to drive the rotary degassing component 32 to rotate, and the slurry to be degassed is fed into the rotating rotary degassing component 32 through the feed pipe 31.

[0055] Under the combined action of gravity and centrifugal force, the slurry to be degassed flows along the rotating channel 321 of the rotating degassing component 32. When it flows to the curved structure 323 of the rotating channel 321, the curved structure 323 shrinks the cross-sectional area of ​​the flow channel and suppresses the axial flow velocity of the slurry to be degassed, so that microbubbles are enriched and merged in the near-wall area and overflow. The spiral groove 322 at the curved structure 323 can guide the slurry to be degassed to form a downward spiral flow liquid film, which peels the attached bubbles from the slurry.

[0056] In summary, the slurry degassing machine 100 is mounted on the rotary drive device 2 via a rotary degassing component 32. The rotary degassing component 32 is connected to the feed pipe 31 and is located within the vacuum chamber 11. This allows the slurry to be degassed to enter the rotary degassing component 32 through the combined action of centrifugal force and the slurry's own gravity when flowing into the rotary degassing component 32 via the feed pipe 31. This, combined with the specific spiral grooves 322 on the inner circumferential wall of the rotary degassing component 32 corresponding to the rotary channel 321, and the opposing spiral grooves, further enhance the degassing effect. The curved surface structure 323 is designed to synergistically degas the slurry to be degassed. The bidirectional curved surface structure 323 reduces the cross-sectional area of ​​the flow channel, locally lowering the axial flow velocity. This allows microbubbles to accumulate near the wall, merge, and rapidly overflow as larger bubbles. The specific shape of the spiral groove 322 acts on the flowing slurry to form a spiral secondary vortex, efficiently peeling off attached bubbles and transporting them to the central low-pressure zone. Furthermore, the spiral groove 322 extends the material flow path, increasing the degassing time. Therefore, compared to existing centrifugal degassing machines that require high-speed centrifugal force to form a film and degas high-viscosity materials, and whose strong shear force can easily damage the intrinsic structural stability of the slurry, the slurry degassing machine 100 of this embodiment is suitable for degassing slurries of various viscosities. It can maintain the intrinsic structural stability of the slurry while operating the rotating degassing component 32 at low speeds (≤200 rpm / min), while actively reconstructing the flow field at the flow channel geometry level, effectively improving the degassing efficiency and degree of slurry degassing, especially for high-viscosity slurries.

[0057] In some of these implementations, such as Figure 4 As shown, the curved surface structure 323 of the rotating degassing component 32 is formed by rotating a curved generatrix around the axis of the rotating degassing component 32; the functional form of the generatrix is:

[0058] ;

[0059] in, ;

[0060] z is the axial coordinate;

[0061] r(z) is the radial distance of the generatrix at point z;

[0062] R0 is the reference radius;

[0063] z c The axial coordinate of the center of the saddle-shaped region;

[0064] A is the amplitude coefficient of the hyperbolic cosine term;

[0065] L is the characteristic length of the hyperbolic cosine;

[0066] B is the amplitude coefficient of the Gaussian term;

[0067] σ is the standard deviation of the Gaussian term;

[0068] Cosh is a hyperbolic cosine function;

[0069] exp is the Gaussian function (bell kernel);

[0070] Meanwhile, the curvature of the curve satisfies K(z) < 0.

[0071] The curvature calculation equation is based on the theoretical formula as follows:

[0072]

[0073] Forming a saddle shape ensures that the generatrix parameters of the spline curve segment meet the requirements. Ensure the busbar is at Z=Z C When the second derivative r"(Zc)>0, after rotation, a saddle-shaped structure with negative Gaussian curvature K<0 is formed in this region, providing a geometric basis for the excitation of secondary flow.

[0074] Understandably, through the specific generatrix equation and conditions of the above-mentioned curved surface structure 323, a negative Gaussian curvature rotating inner wall can be accurately constructed to cooperate with the spiral groove 322 to perform degassing treatment on the slurry to be degassed, thereby effectively improving the degassing efficiency and degassing degree without destroying the intrinsic structure of the slurry.

[0075] In other embodiments, the generatrix may also be a parabola, so that the curved surface structure 323 forms a structure that bends in opposite directions.

[0076] In some implementations, such as Figures 2 to 4As shown, the rotary degassing component 32 includes an upper section 324, a middle section 325, and a lower section 326 connected sequentially along the axial direction; the upper section 324, the middle section 325, and the lower section 326 smoothly transition and are sequentially connected to form the rotary channel 321; that is, in the axial projection direction of the rotary degassing component 32, the connecting line between the upper section 324 and the middle section 325 is a tangent curve, where R0 is the X(r) value of the connection point between the straight line segment of the upper section 324 and the tangent curve between the upper section 324 and the middle section 325, which is the basic radius R0; the connecting line between the middle section 325 and the lower section 326 is also a tangent curve, so that the upper section 324, the middle section 325, and the lower section 326 smoothly transition, so that the structure of the entire rotary channel 321 has no abrupt curvature changes, ensuring G 2 The continuous curvature eliminates drastic fluctuations in the flow rate and pressure of the slurry, effectively ensuring that the slurry always flows smoothly and tightly against the wall, eliminating dynamic abrupt changes. The inner peripheral wall of the middle section 325 is the curved surface structure 323, and the spiral groove 322 is provided at the curved surface structure 323; the radial cross-sectional area of ​​the lower section 326 increases axially from the first end near the middle section 325 to the second end away from the middle section 325. It should be noted that the upper section 324 of the rotary degassing component 32 is the transition area between the feed pipe 31 and the main body of the rotary degassing component 32. It needs to receive the slurry at the feed pipe 31 and transport it to the lower middle section 325 and lower section 326. It can be adapted to the shape of the feed pipe 31 and the shape of the middle section 325, for example, it can be a straight cylinder, a conical cylinder, etc., without special restrictions. The angle between the generatrix of the upper section 324 and the axis can be in the range of 0~180°. Understandably, the rotating degassing component 32 forms a segmented structure, and different segmented regions can form different structures and shapes as needed. Specifically, in this embodiment, through the design of specific spiral grooves 322 on the peripheral wall of the middle section 325 region and the opposing curved surface structure 323, the intrinsic structural stability of the slurry can be guaranteed under low-speed operation of the rotating degassing component 32, while actively reconstructing the flow field from the perspective of flow channel geometry, so as to effectively improve the degassing efficiency and degassing degree. The lower section 326 is located behind the middle section 325, and the cross-sectional area of ​​the flow channel of the lower section 326 increases from one end closer to the middle section 325 to the opposite end, thereby forming a gradually expanding flow channel. When the slurry leaves the middle section 325 region and enters the lower section 326, the flow channel smoothly expands with the lower section 326 through the transition curve, the liquid film velocity gradually changes, the flow field transitions stably, and the turbulence is effectively prevented from entraining new bubbles.

[0077] Specifically in this embodiment, such as Figure 3As shown, in the axial projection direction of the lower section 326, the opposite sides of the lower section 326 are straight structures, that is, the generatrix of the lower section 326 is a straight generatrix. The lower section 326 is formed by rotating the straight generatrix around the axis of the rotating degassing component 32. It can be understood that the lower section 326 has a conical cylindrical structure with a small front end and a large rear end, and the straight generatrix of the cylinder forms a smooth and gradually expanding channel. When the slurry flows from the middle section 325 into the lower section 326 and flows through the smaller cross section at the front end of the lower section 326 to the larger outlet at the rear end, a low-resistance outflow channel can be formed. Its straight inclined surface can guide the slurry to flow smoothly, effectively avoiding wall adhesion, deposition or bridging, improving the smoothness of discharge, and suppressing the generation of boundary layer separation and local eddies, effectively avoiding the entrainment of new air bubbles.

[0078] In some implementations, such as Figure 3 As shown, the radial cross-sectional area of ​​the upper section 324 increases axially from the first end near the middle section 325 to the second end away from the middle section 325. That is, the cross-sectional area of ​​the flow channel of the upper section 324 increases from one end near the middle section 325 to the opposite end, forming a slurry flow channel that gradually narrows from the front end to the back end. In the axial projection direction of the upper section 324, the opposite sides of the upper section 324 are straight structures, that is, the generatrix of the upper section 324 is a straight generatrix, wherein the upper section 324 is formed by rotating the straight generatrix around the axis of the rotating degassing member 32 for one revolution. Understandably, the upper section 324 has a conical cylindrical structure with a larger front end and a smaller rear end. The straight generatrix of the cylinder forms a smoothly tapering channel. When the slurry flows into the upper section 324 from the feed pipe 31, the flow cross-sectional area continuously decreases as it flows from the larger front cross-section to the smaller rear outlet, causing the slurry velocity to increase steadily. The straight tapering structure effectively avoids flow disturbances caused by abrupt changes in cross-section, maintaining flow stability while increasing the flow velocity. The accelerated slurry can enter the middle section 325 region in a more orderly manner. The higher flow velocity helps to evenly spread or disperse the slurry, thereby improving defoaming efficiency.

[0079] In some implementations, such as Figure 2As shown, the feed pipe 31 includes a main feed pipe 311 and multiple feed distribution pipes 312; the rotating shaft 21 of the rotary drive device 2 has an axially arranged mounting hole 211, and the main feed pipe 311 is inserted into the mounting hole 211; the rotary degassing component 32 is provided with a connecting plate 327, and the rotating shaft 21 of the rotary drive device 2 is connected to the connecting plate 327; the rotating shaft 21 has multiple radial holes communicating with the mounting hole 211 in the radial direction, and the first end of the feed distribution pipe 312 passes through the radial hole and communicates with the main feed pipe 311. The second end of the feed distribution pipe 312 passes through the connecting plate 327 and communicates with the rotating channel 321. Understandably, the feed pipe 31 consists of a main feed pipe 311 and multiple distribution pipes 312. The main feed pipe 311 passes through the mounting hole 211 on the rotating shaft 21 of the rotary drive device 2, and the multiple distribution pipes 312 are distributed along the circumferential direction of the rotating shaft 21, so that the main feed pipe 311 and the distribution pipes 312 can rotate together with the rotating shaft 21 of the rotary drive device 2, making the entire rotating assembly a whole, reducing the risk of vibration and imbalance during high-speed rotation, and preventing structural interference between the three components. The slurry is evenly distributed through the multiple distribution pipes 312 to the rotating channel 321 of the rotary degassing component 32 for degassing treatment, effectively avoiding the flow turbulence caused by excessive local flow or uneven distribution, facilitating the formation of a stable liquid film and efficient degassing in the rotating channel 321. In addition, the rotary degassing component 32 is connected to the rotating shaft 21 of the rotary drive device 2 through a connecting plate 327, which has the characteristics of a stable connection and can rotate smoothly under the drive of the rotary drive device 2.

[0080] In some implementations, such as Figure 2 As shown, the second end of the distribution pipe 312 is bent, and the opening of the second end of the distribution pipe 312 faces the side wall of the rotating deaerator 32. Understandably, this structure, where the distribution pipe 312 is bent towards the side wall of the rotating deaerator 32, allows the slurry to flow smoothly along the bend from the distribution pipe 312, rather than being sprayed directly towards the center of the rotating deaerator 32 or scattered randomly. Instead, it flows against the side wall of the rotating deaerator 32, mitigating the impact force of the slurry jet and preventing splashing or air bubble entrainment due to excessive flow velocity or sudden changes in direction. Furthermore, the slurry flows directly along the side wall, allowing it to spread evenly under centrifugal force, forming a uniform liquid film that facilitates efficient deaeration within the rotating channel 321.

[0081] In some implementations, such as Figure 3As shown, the number of spiral grooves 322 is at least one, preferably multiple, and more preferably 3 to 5. Each spiral groove 322 has a groove depth of 0.5 mm to 2 mm, a groove width of 1 mm to 5 mm, and a spiral angle of 0.1° to 0.2°. Based on the specific parameter settings of this spiral groove 322, it is well-suited for high-viscosity slurries and can effectively guide slurry flow without weakening the cylinder strength of the rotating degassing component 32.

[0082] Specifically, in this embodiment, under the local cylindrical approximation (taking the average radius r0=r(z)), the spatial trajectory of the k-th spiral groove 322 is defined by the following parametric equation:

[0083]

[0084] in:

[0085] Zs and Ze are the axial start and end coordinates of the curved surface structure 323 (in this embodiment, the start and end are 340 to 400);

[0086] r0 is the average radius of the inner wall of this section, which is determined by the generatrix function r(z). In this embodiment, it is 340 to 400. Then, r(z) is calculated by the generatrix function equation.

[0087] P is the pitch;

[0088] N is the number of slots;

[0089] K represents the current spiral groove number 322, where K = 0, 1, ..., N-1;

[0090] θ: Parametric angle / helix unfolding angle, unit: radians (rad);

[0091] Φ(θ) is the azimuth / circumferential angle;

[0092] ρ(θ): Radial distance / radius function, unit: millimeters (mm);

[0093] Z(θ): Axial position / height function, unit: millimeters (mm).

[0094] It should be noted that:

[0095] θ is an independent parameter used to describe the trajectory of the spiral groove 322. As θ increases from 0, the point moves forward along the spiral groove 322. Each increase of 2π represents a complete revolution around the central axis of the rotating degassing component 32.

[0096] Ze-Zs is the total height of the spiral. For example, if Ze - Zs = 60mm and P = 2.5mm, then N = 12 full turns, and θ ∈ [0, 24π] (because 12 × 2π == 24π).

[0097] Φ(θ) represents the rotation angle of a point on the spiral groove 322 relative to the reference direction and the X-axis in the horizontal plane when the parameter angle is θ. In this embodiment, Φ(θ) can be understood as the total angle of a point when it rotates a certain angle along the Z direction; it determines the position of the groove on the circumference; the initial phase offset of the kth groove is used to achieve the uniform distribution of multiple grooves.

[0098] ρ(θ) represents the vertical distance from the point on the spiral groove 322 to the central axis (z-axis) of the rotating degassing component 32 when the parameter angle is θ. On an ideal cylindrical surface, ρ is a constant. In this embodiment, since the generatrix is ​​a curved surface, strictly speaking, ρ should be equal to the generatrix r(z). However, because the curved surface structure 323 changes gradually, it is approximated as a constant r0 in engineering. It should be noted that ρ is used instead of r to distinguish it from the function r(z) of the generatrix of the curved surface structure 323, thereby avoiding confusion between the surface radius and the radius of the spiral groove 322.

[0099] Z(θ) represents the height of the point on the spiral groove 322 along the central axis (z-axis) of the rotating degassing component 32 when the parameter angle is θ; Z increases linearly as θ increases.

[0100] When θ=0 → Z=Zs (initial height);

[0101] When θ = 2π → Z = Zs + P (increase by one pitch);

[0102] When θ is at its maximum, Z = Ze.

[0103] Specifically, the value in this embodiment is:

[0104] P is set to 2.5;

[0105] The total height of the spiral is 60 (i.e., 400-340=60).

[0106] There are 4 spiral grooves 322 (the direction of the spiral is the same as the rotation direction of the rotating degassing component 32), and they are evenly distributed around the circumference at 90° intervals;

[0107] Groove depth (radial depth) 1mm;

[0108] Groove width (circumferential arc length width) 3mm;

[0109] The helix angle is 0.169°, which is calculated using the following formula:

[0110]

[0111] Understandably, when the rotating degassing member 32 rotates, the slurry flows downward along the specific spiral groove 322 under the action of centrifugal force, which can keep the radial velocity component of the slurry flowing in the groove stable and prevent acceleration or deceleration impacts caused by abrupt changes in the curvature of the groove. Compared with other spirals, the spiral of this embodiment provides a smoother flow velocity transition, effectively avoiding slurry splashing or turbulence caused by drastic changes in flow velocity, thereby reducing the risk of air bubbles being re-entered.

[0112] In some implementations, such as Figure 1 As shown, the outer casing 1 has a cylindrical structure and is provided with a pressure detection port, a vacuum port, and a discharge port communicating with the cavity 11. Further, the outer casing 1 includes a first cylindrical body 12 and a second cylindrical body 13 communicating with the first cylindrical body 12. The first cylindrical body 12 has a circular cylindrical structure, and the second cylindrical body 13 has a conical cylindrical structure. The discharge port is located at the end of the second cylindrical body 13 away from the first cylindrical body 12, and is located at the constricted end of the conical cylindrical structure to facilitate slurry discharge. The rotary drive device 2 is disposed on the first cylindrical body 12.

[0113] In some embodiments, the outer casing 1 is mounted on the fixing frame 4 and is suspended to facilitate bottom discharge operation.

[0114] The present invention also provides a rotary degassing component 32, such as... Figure 2 and Figure 3As shown, the rotary degassing component 32 includes an upper section 324, a middle section 325, and a lower section 326 connected sequentially along the axial direction. The upper section 324, the middle section 325, and the lower section 326 smoothly transition and are sequentially connected to form a rotating channel 321. In the axial projection direction of the rotary degassing component 32, the middle section 325 bends towards each other on opposite sides of the inner peripheral wall of the rotating channel 321 to form a curved surface structure 323, and a spiral groove 322 is provided at the curved surface structure 323. The radial cross-sectional area of ​​the lower section 326 increases axially from a first end near the middle section 325 to a second end away from the middle section 325. The rotary degassing component 32 can be installed inside the slurry degassing machine 100 for rotary degassing of the slurry. The slurry to be degassed enters the rotating channel 321 of the rotary degassing component 32 under the combined action of the centrifugal force and the gravity of the slurry itself. Combined with the specific spiral groove 322 in the middle section 325 area corresponding to the inner peripheral wall of the rotating channel 321 and the design of the opposing curved surface structure 323, it can synergistically degas the slurry to be degassed. The bidirectional curved surface structure 323 can reduce the cross-sectional area of ​​the flow channel to reduce the axial flow velocity locally, so that microbubbles are enriched in the near-wall area, merged and become larger bubbles that quickly overflow. The specific shape of the spiral groove 322 can act on the flowing slurry to form a spiral secondary vortex, which can efficiently peel off the attached bubbles and transport them to the central low-pressure area. The spiral groove 322 can also make the material flow path longer and increase the degassing time. Therefore, it can actively reconstruct the flow field from the perspective of the flow channel geometry, so as to effectively improve the degassing efficiency and degassing degree while ensuring the intrinsic structural stability of the slurry under low speed conditions.

[0115] The above embodiments are not an exhaustive list based on the present invention, and there may be many other embodiments not listed. Any substitutions and improvements made without departing from the concept of the present invention are within the protection scope of the present invention.

Claims

1. A rotary degassing component, characterized in that, The rotary degassing component includes an upper section, a middle section, and a lower section connected sequentially along the axial direction; the upper section, the middle section, and the lower section are smoothly transitioned and sequentially connected to form a rotation channel; In the axial projection direction of the rotating degassing component, the middle section bends towards each other on opposite sides of the inner peripheral wall of the rotating channel to form a curved surface structure, and a spiral groove is provided at the curved surface structure; The radial cross-sectional area of ​​the lower section increases axially from the first end near the middle section to the second end away from the middle section; The curved surface structure of the rotary degassing component is formed by rotating a curved generatrix around the axis of the rotary degassing component; the functional form of the generatrix is: ； in, ; z is the axial coordinate; r(z) is the radial distance of the generatrix at point z; R0 is the reference radius; z c The axial coordinate of the center of the saddle-shaped region; A is the amplitude coefficient of the hyperbolic cosine term; L is the characteristic length of the hyperbolic cosine; B is the amplitude coefficient of the Gaussian term; σ is the standard deviation of the Gaussian term; In the axial projection direction of the lower segment, the opposite sides of the lower segment are straight structures; The radial cross-sectional area of ​​the upper section increases axially from the first end near the middle section to the second end away from the middle section, and the two opposite sides of the upper section are straight structures in the axial projection direction of the upper section.

2. The rotary degassing component as described in claim 1, characterized in that, The number of spiral grooves is at least one, and the groove depth is 0.5mm~2mm, the groove width is 1mm~5mm, and the spiral angle is 0.1°~0.2°.

3. A slurry degassing machine, characterized in that, The slurry degassing machine includes an outer shell, a rotary drive device, and a degassing device; The outer shell has a cavity, and the rotary drive device is disposed on the outer shell; The degassing device includes a feed pipe and a rotary degassing component as described in claim 1 or 2; the rotary degassing component is disposed on the rotating shaft of the rotary drive device and is located within the cavity; The rotary degassing component has a rotating channel connected to the feed pipe. In the axial projection direction of the rotary degassing component, the rotary degassing component bends towards each other on opposite sides of the inner peripheral wall of the rotating channel to form a curved surface structure. The curved surface structure is provided with a spiral groove that is circumferentially arranged.

4. The slurry degassing machine as described in claim 3, characterized in that, The rotary degassing component includes an upper section, a middle section, and a lower section connected sequentially along the axial direction; the upper section, the middle section, and the lower section are smoothly transitioned and sequentially connected to form the rotary channel; The inner peripheral wall of the middle section is a curved surface structure, and the spiral groove is provided at the curved surface structure; the radial cross-sectional area of ​​the lower section increases axially from the first end near the middle section to the second end away from the middle section.

5. The slurry degassing machine as described in any one of claims 3-4, characterized in that, The feed pipe includes a main feed pipe and multiple feed distribution pipes; the rotating shaft of the rotary drive device is provided with an axial mounting hole, and the main feed pipe is inserted into the mounting hole; the rotary degassing component is provided with a connecting plate, and the rotating shaft of the rotary drive device is connected to the connecting plate; the rotating shaft is provided with multiple radial holes communicating with the mounting hole in the radial direction, the first end of the feed distribution pipe passes through the radial hole and communicates with the main feed pipe, and the second end of the feed distribution pipe passes through the connecting plate and communicates with the rotating channel.

6. The slurry degassing machine as described in claim 5, characterized in that, The second end of the material distribution pipe is bent, and the opening of the second end of the material distribution pipe faces the side wall of the rotating degassing component.

7. A method for degassing slurry, characterized in that, The slurry degassing machine according to any one of claims 3-6, the slurry degassing method includes the following steps: The rotary drive device is controlled to drive the rotary deaerator to rotate, and the slurry to be deaerated is fed into the rotating deaerator through the feed pipe. Under the combined action of gravity and centrifugal force, the slurry to be degassed flows along the rotating channel of the rotating degassing component. When it flows to the curved structure of the rotating channel, the curved structure shrinks the cross-sectional area of ​​the flow channel and suppresses the axial flow velocity of the slurry to be degassed, so that microbubbles accumulate and merge in the near-wall area and overflow. In addition, the spiral groove at the curved structure can guide the slurry to be degassed to form a downward spiral flow liquid film, which peels the attached bubbles from the slurry.

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