Paddle of film evaporator

Abstract

The paddle comprises a round hub connected with a mandrel, a plurality of blades are fixedly connected in the circumferential direction of the round hub, the round hub comprises a round pipe, clamping pieces are fixedly connected to the two ends of the round pipe, positioning grooves are formed in the circumferential directions of the clamping pieces, the two ends of the blades are fixedly connected to the positioning grooves, and the outer diameter of the round pipe is smaller than that of the clamping pieces. According to the paddle of the film evaporator, the structure of the circular hub is changed, the overall weight of the paddle is reduced, and the critical rotating speed of the paddle is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of thin film evaporators, in particular to a blade of a thin film evaporator. Background Art

[0002] High-efficiency rotary thin film evaporator is a new type of high-efficiency evaporator that can perform falling film evaporation under certain vacuum conditions by forming an "air knife" through the high-speed rotation of a fixed rotating scraper. It has a large heat transfer coefficient, high evaporation intensity, short and adjustable flow time, and is particularly suitable for evaporation and concentration of heat-sensitive materials and high-viscosity materials, as well as solvent removal.

[0003] Therefore, the high-speed rotating blades located inside the cylinder are subject to more stringent requirements. To ensure that the blades run smoothly at high speeds without abnormal vibration or noise, it is necessary to control the effects of residual imbalance or eccentricity on them. Strict overall dynamic balancing is performed in accordance with ISO1840 (all rotating parts are assembled as a whole, and then the overall dynamic balancing test is performed) to eliminate residual imbalance or eccentricity at the source.

[0004] The hub of existing blades is an integrally formed circular tube, which is then welded to the blades. During actual operation, the blade's actual rotational speed should be controlled within 70% of its critical speed. However, this blade structure, due to the heavy weight of the circular tube, results in a high overall weight, and the blade's critical speed does not meet the design requirements. Utility Model Content

[0005] The technical problem to be solved by the utility model is: the utility model provides a blade of a thin film evaporator, which reduces the overall weight of the blade by changing the structure of the circular hub, so that the critical speed of the blade can be increased.

[0006] The technical solution adopted by the utility model to solve its technical problems is: a blade of a thin film evaporator, including a circular hub connected to a core shaft, a plurality of blades fixedly connected to the circumference of the circular hub, the circular hub including a circular tube, both ends of the circular tube fixedly connected to a clamping piece, a positioning groove is opened on the circumference of the clamping piece, the two ends of the blade are fixedly connected to the positioning groove, and the outer diameter of the circular tube is smaller than the outer diameter of the clamping piece.

[0007] Furthermore, in order to position the two ends of the circular tube, the inner side of the clamping piece is provided with a step positioning portion, and the ends of the circular tube cooperate with the step positioning portion.

[0008] Furthermore, in order to allow the core shaft to be installed in the circular hub, a through hole is provided in the clamping member, and the through hole is aligned with the central hole of the circular tube.

[0009] Furthermore, in order to connect the clamping member and the round tube into a whole, the clamping member and the round tube are fixed by welding.

[0010] Furthermore, in order to connect the blades and the circular hub as a whole, the blades are fixed to the clamping member and the circular tube by welding.

[0011] Furthermore, in order to ensure the cleanliness of the surfaces of the clamping member and the circular tube, the clamping member is a boss structure, and the joint between the clamping member and the circular tube is transitioned through an arc or chamfer.

[0012] Furthermore, in order to ensure the film-forming effect, the end of the blade also has a folded angle.

[0013] Furthermore, in order to meet actual usage requirements, the number of the blades is 3, 4, 6, 8 or more.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. The blade of the thin film evaporator of the utility model improves the structure of the circular hub, reduces the volume and weight of the circular tube, reduces the weight of the blade as a whole, and thus increases the critical speed of the blade.

[0016] 2. The blades, circular tubes, clamps and blades of the thin film evaporator of the utility model are connected as a whole through welding, which ensures the consistency of the blades being evenly distributed around the circumference, thereby better meeting the actual use requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a schematic diagram of the structure of the blade of the thin film evaporator of the present utility model;

[0019] Figure 2 for Figure 1 Side view of

[0020] Figure 3 This is the cross-sectional view of the hub;

[0021] Figure 4 for Figure 3 Side view of

[0022] In the figure: 1, circular hub, 11, circular tube, 12, clamping piece, 13, positioning groove, 2, blade. DETAILED DESCRIPTION

[0023] The present invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner.

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0025] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0026] like Figures 1 to 4 As shown, a thin-film evaporator paddle comprises a circular hub 1 connected to a core shaft, with multiple blades 2 fixedly attached circumferentially to the hub 1. Depending on actual use, the number of blades can be 3, 4, 6, 8, or more. In this embodiment, four blades 2 are used. The ends of the blades 2 also have angled corners to ensure film formation. This is a conventional structure and will not be described in detail here.

[0027] The hub 1 comprises a circular tube 11, with clamps 12 fixed to each end. The outer diameter of the tube 11 is smaller than that of the clamps 12. This reduction in the outer diameter of the tube 11 significantly reduces its weight, reducing the overall weight of the blade by 30%. This increases the blade's actual rotational speed and improves film formation at extremely low flow rates.

[0028] The inner side of the clamp 12 has a stepped positioning portion, and the end of the circular tube 11 cooperates with the stepped positioning portion. The stepped positioning portion allows the clamp 12 and the circular tube 11 to be accurately docked, ensuring that the through hole of the clamp 12 is aligned with the center hole of the circular tube 11, facilitating the subsequent assembly of the mandrel.

[0029] The clamping member 12 is a boss structure, welded to the circular tube 11 to form a single unit. The joints between the clamping member 12 and the circular tube 11 are curved or chamfered. Thin-film evaporators are used in sanitary conditions, so the design of this structure also takes into account aspects such as easier cleaning and no residue. The joints between the clamping members 12 and the circular tube 11 at both ends adopt curved transitions or chamfers to make their surfaces easier to clean.

[0030] A positioning groove 13 is provided on the circumference of the clamping member 12, and both ends of the blade 2 are fixed to the positioning groove 13. The blade 2 is fixed to the clamping member 12 and the circular tube 11 by welding, so that the consistency of the blade 2 can be guaranteed.

[0031] After welding, all welds are ground and polished to make their surfaces arc transition and the surface finish Ra≤0.4μm.

[0032] In summary, the blade of the thin film evaporator of the present invention reduces the overall weight of the blade by changing the structure of the circular hub, thereby increasing the critical speed of the blade.

[0033] The above description is based on the ideal embodiment of the present invention. Based on the above description, relevant personnel can make various changes and modifications without departing from the technical scope of this utility model. The technical scope of this utility model is not limited to the content of the specification and must be determined according to the scope of the claims.

Claims

1. A thin film evaporator blade, comprising a circular hub (1) connected to a core shaft, wherein a plurality of blades (2) are fixedly connected to the circumference of the circular hub (1), characterized in that: The circular hub (1) comprises a circular tube (11), the two ends of the circular tube (11) are fixedly connected with clamping members (12), a positioning groove (13) is provided on the circumference of the clamping member (12), the two ends of the blade (2) are fixedly connected to the positioning groove (13), and the outer diameter of the circular tube (11) is smaller than the outer diameter of the clamping member (12).

2. The thin film evaporator blade according to claim 1, characterized in that: The inner side of the clamping piece (12) is provided with a step positioning portion, and the end of the circular tube (11) is matched with the step positioning portion.

3. The thin film evaporator blade according to claim 2, characterized in that: The clamping member (12) has a through hole therein, and the through hole is aligned with the central hole of the circular tube (11).

4. The thin film evaporator blade according to claim 3, characterized in that: The clamping piece (12) is fixed to the round tube (11) by welding.

5. The thin film evaporator blade according to claim 1, characterized in that: The blade (2) is fixed to the clamping piece (12) and the circular tube (11) by welding.

6. The thin film evaporator blade according to claim 1, characterized in that: The clamping member (12) is a boss structure, and the joint between the clamping member (12) and the circular tube (11) is transitioned through an arc or chamfer.

7. The thin film evaporator blade according to claim 1, characterized in that: The ends of the blades (2) also have a folded angle.

8. The thin film evaporator blade according to claim 6, characterized in that: The number of the blades is 3, 4, 6 or 8.

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