Helical ribbon stirrer and vacuum drying machine

Abstract

The utility model relates to a helical ribbon stirrer and a vacuum dryer, which belong to the technical field of stirring devices and comprise a main shaft and a helical ribbon fixedly connected to the main shaft. A liquid inlet pipe for introducing a heating medium and a liquid outlet pipe for discharging the heating medium are arranged in the main shaft, a heating channel for allowing the heating medium to flow is arranged in the helical ribbon, the heating channel is provided with two openings, one opening is communicated with the liquid inlet pipe, and the other opening is communicated with the liquid outlet pipe; the helical ribbon comprises an upper sealing plate and a lower sealing plate; a plurality of protrusions are arranged on the upper sealing plate and / or the lower sealing plate, each protrusion comprises a wave crest part and a wave trough part, and cavities between the wave crest parts of the adjacent protrusions are communicated with one another. The spiral ribbon heating container has the advantages that the main shaft and the spiral ribbon in the middle of the container can be heated, the heating efficiency and the drying efficiency are greatly improved, the heat exchange efficiency of the surface of the spiral ribbon is improved through the protruding structure, and the spiral ribbon heating container is particularly suitable for a large-volume vacuum dryer.

Description

Technical Field

[0001] The utility model relates to the technical field of drying devices, in particular to a spiral ribbon stirrer and a vacuum dryer. Background Art

[0002] Vacuum dryers are primarily used for drying products. During the drying process, the material is placed in a container and then the container walls are heated for drying. A ribbon agitator is often used to stir the material in the container so that the material is in full contact with the container walls, thereby accelerating the heating of the material. However, in large-volume vacuum dryers, the temperature in the middle of the container is low, and simply using a ribbon agitator to stir the material cannot quickly heat all the material. Therefore, in the prior art, a heating channel is often provided within the ribbon, and a heating medium is passed through the heating channel to heat the material in the middle of the container. However, the existing heating channels are parallel and orderly, and the heating medium forms a laminar flow when flowing through them. There is no obvious interlacing or cross-talk between the particles of the heating medium, resulting in the heating medium in the middle of the heating channel not being able to fully contact the ribbon surface, resulting in low heat exchange efficiency, low material heating efficiency, and low drying efficiency. Utility Model Content

[0003] The purpose of the utility model is to provide a spiral ribbon stirrer and a vacuum dryer, which are used to solve the problems of low material heating efficiency and low drying efficiency.

[0004] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0005] A spiral ribbon stirrer comprises a main shaft and a spiral ribbon, wherein the spiral ribbon is fixedly connected to the main shaft; an inlet pipe for introducing a heating medium and a liquid outlet pipe for discharging the heating medium are provided in the main shaft, and a heating channel for accommodating the flow of the heating medium is provided in the spiral ribbon, and the heating channel has two openings, one of which is connected to the inlet pipe, and the other is connected to the outlet pipe; the spiral ribbon comprises an upper sealing plate and a lower sealing plate, and the heating channel is located between the upper sealing plate and the lower sealing plate; a plurality of protrusions are provided on the upper sealing plate and / or the lower sealing plate, each of the protrusions comprises a crest portion and a trough portion, the crest portion is away from the sealing plate on the opposite side, and the trough portion is close to the sealing plate on the opposite side, and the cavities between the crest portions of adjacent protrusions are connected to each other.

[0006] Preferably, the plurality of protrusions are evenly arranged.

[0007] Preferably, the trough portion of the projection is spot-welded to the sealing plate on the opposite side.

[0008] Preferably, the periphery of the upper sealing plate and the periphery of the lower sealing plate are sealed by welding.

[0009] Preferably, a plurality of struts are provided between the main shaft and the spiral belt, and one end of each strut is fixedly connected to the main shaft and the other end is fixedly connected to the spiral belt.

[0010] Preferably, the spiral ribbon is spirally arranged around the main shaft, and the distance between the spiral ribbon and the main shaft is larger at the top and smaller at the bottom. The two openings of the spiral ribbon are respectively arranged on the upper and lower sides. The opening on the upper side of the spiral ribbon is connected to the main shaft through the support rod, and the opening on the lower side of the spiral ribbon is directly connected to the main shaft.

[0011] A vacuum dryer comprises the ribbon stirrer.

[0012] Compared with the prior art, in the spiral ribbon agitator provided by the present invention, the raised structure arranged on the spiral ribbon can increase the surface area of the sealing plate, increase the contact area between the sealing plate and the heating medium, and can improve the efficiency of heat transfer from the heating medium to the spiral ribbon surface, thereby improving the heating and drying efficiency; in addition, the raised structure can form a wavy ridge in the entire heating channel, with crests and troughs. When the heating medium flows through the crest, the cross-section increases sharply, and when it flows through the trough, the cross-section decreases sharply. Such a situation will greatly increase the formation of turbulence, and obvious interlacing and crossing will be formed between the particles of the heating medium, which will help to improve the heat exchange efficiency on the spiral ribbon surface and further improve the heating and drying efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The accompanying drawings illustrate exemplary embodiments of the present invention and, together with the description, are used to explain the principles of the present invention. These drawings are included to provide a further understanding of the present invention, and are included in and constitute a part of this specification.

[0014] Figure 1 1. It is a structural schematic diagram of an embodiment of a ribbon agitator;

[0015] Figure 2 is a cross-sectional schematic diagram of a spiral ribbon;

[0016] Figure 3 It is a schematic diagram of the unfolded structure of the spiral ribbon;

[0017] In the figure: 1-main shaft, 2-screw belt, 3-heating channel, 4-upper sealing plate, 5-lower sealing plate, 6-protrusion, 7-peak part, 8-trough part, 9-support rod. DETAILED DESCRIPTION

[0018] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the relevant content and are not intended to limit the present invention. It should also be noted that, for ease of description, only the parts relevant to the present invention are shown in the accompanying drawings.

[0019] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0020] like Figure 1-Figure 3 As shown, a spiral ribbon stirrer includes a main shaft 1 and a spiral ribbon 2, and the spiral ribbon 2 is fixedly connected to the main shaft 1; the main shaft 1 is provided with an inlet pipe for introducing a heating medium and a liquid outlet pipe for flowing out the heating medium, and the liquid inlet pipe and the liquid outlet pipe are connected to external equipment through pipelines to form a closed loop circuit for the flow of the heating medium, and the spiral ribbon 2 is provided with a heating channel 3 for accommodating the flow of the heating medium, and the heating channel 3 has two openings, one of which is connected to the liquid inlet pipe, and the other opening is connected to the liquid outlet pipe.

[0021] In the spiral ribbon agitator provided by the present invention, a heating channel 3 is provided between the main shaft 1 and the spiral ribbon 2. The heating medium is introduced through the liquid inlet pipe of the main shaft 1, flows through the spiral ribbon 2, and then flows out from the liquid outlet pipe, so that both the main shaft 1 and the spiral ribbon 2 have a heating effect. Compared with the traditional, simple container wall heating, in the present invention, the main shaft 1 and the spiral ribbon 2 located in the middle of the container can be heated, which greatly improves the heating efficiency and drying efficiency. It is particularly suitable for large-volume vacuum dryers.

[0022] The above-mentioned heating medium is water or oil.

[0023] In one embodiment, Figure 2 As shown, the spiral belt 2 includes an upper sealing plate 4 and a lower sealing plate 5, and the heating channel 3 is located between the upper sealing plate 4 and the lower sealing plate 5. One of the upper sealing plate 4 and the lower sealing plate 5 is a main plate. The structural strength of the main plate is higher and a thicker steel plate is used. The two sealing plate structures can facilitate the formation of a cavity in the middle during the production process. Figure 3 This is the unfolded view of the spiral ribbon before it is processed into a spiral shape.

[0024] The upper sealing plate 4 and the lower sealing plate 5 are sealed by welding. During the production process, the two sealing plates are first completely sealed by welding to form a closed cavity inside, and then opened at both ends for communication with the main shaft 1 and the support rod 9.

[0025] In one embodiment, a plurality of protrusions 6 are provided on the upper sealing plate 4 and / or the lower sealing plate 5. Each protrusion 6 includes a crest portion 7 and a trough portion 8. The crest portion 7 is away from the sealing plate on the opposite side, and the trough portion 8 is close to the sealing plate on the opposite side. The cavities between the crest portions 7 of adjacent protrusions 6 are interconnected to form a continuous heating channel 3. This structure has two advantages:

[0026] First, the raised structure can increase the surface area of the sealing plate, increase the contact area between the sealing plate and the heating medium, and improve the efficiency of heat transfer from the heating medium to the surface of the spiral ribbon 2, thereby improving the heating and drying efficiency. The above-mentioned sealing plate is an upper sealing plate 4 or a lower sealing plate 5 with a protrusion 6;

[0027] Secondly, the raised structure can form a wave-shaped ridge in the entire heating channel 3, with crests and troughs. When the heating medium flows through the crests, the cross-section increases sharply, and when it flows through the troughs, the cross-section decreases sharply. This situation will greatly increase the formation of turbulence, and there will be obvious interlacing and crossing between the particles of the heating medium, which will help to improve the heat exchange efficiency on the surface of the spiral ribbon 2.

[0028] If there is no raised structure, the heating channel 3 between the upper sealing plate 4 and the lower sealing plate 5 is parallel and orderly, and a laminar flow will be formed when the heating medium flows through. There will be no obvious interlacing and crossing between the particles of the heating medium, resulting in the heating medium in the middle being unable to fully contact the surface of the spiral ribbon 2, and the heat exchange efficiency is low.

[0029] The raised structure can be provided on the upper sealing plate 4 or on the lower sealing plate 5. The raised structure is preferably provided on the lower sealing plate 5. The upper sealing plate 4 serves as the main plate with higher structural strength to prevent materials from accumulating on the upper sealing plate 4.

[0030] The plurality of protrusions 6 are preferably evenly arranged, or may be unevenly arranged. The protrusions 6 are preferably in the shape of an arc top.

[0031] In one embodiment, the trough portion 8 of the protrusion 6 is spot-welded to the opposite sealing plate. This welding can fix the lower sealing plate 5 to the upper sealing plate 4 serving as the main body plate. Multi-point welding plays a reinforcing role and increases the structural strength. At the same time, spot welding can reduce the area of the connection joint as much as possible and increase the area of the heating channel 3.

[0032] During the forming process of the spiral ribbon 2, the upper sealing plate 4 and the lower sealing plate 5 are first sealed by welding to form a cavity inside, and then multiple welding points are selected on the upper sealing plate 4 and the lower sealing plate 5, and the welding points are evenly spaced. At the welding point positions, the lower sealing plate 5 and the upper sealing plate 4 are welded by spot welding. Finally, high-pressure gas or high-pressure liquid is introduced into the cavity, so that the positions other than the welding points bulge outward to form multiple protruding structures.

[0033] In one embodiment, a plurality of struts 9 are provided between the main shaft 1 and the spiral belt 2. One end of each strut 9 is fixed to the main shaft 1 and the other end is fixed to the spiral belt 2. The strut 9 plays a supporting role, and the circumferential direction of the strut 9 is perpendicular to the axial direction of the main shaft 1.

[0034] In one embodiment, the spiral ribbon 2 is spirally arranged around the main shaft 1, and the distance between the spiral ribbon 2 and the main shaft 1 is larger at the top and smaller at the bottom. The two openings of the spiral ribbon 2 are respectively arranged on the upper and lower sides. The opening on the upper side of the spiral ribbon 2 is connected to the main shaft 1 through the support rod 9, and the opening on the lower side of the spiral ribbon 2 is directly connected to the main shaft 1. Here, "up" is the direction of the connection end of the main shaft 1 and the external device, and "down" is the opposite direction of the connection end of the main shaft 1 and the external device.

[0035] The support rods 9 are arranged from top to bottom, and the required length of the support rods 9 gradually becomes shorter. The lowest part of the spiral belt 2 does not need a support rod 9 and can be directly connected to the main shaft 1;

[0036] Through this structure, the heating medium will pass through the liquid inlet pipe, enter the uppermost support rod 9, and then flow into the upper opening of the spiral ribbon 2. After flowing through the heating channel 3 of the spiral ribbon 2, it will flow into the liquid outlet pipe from the lower opening of the spiral ribbon 2, forming a closed loop. Of course, the heating medium can also flow in from the lower opening of the spiral ribbon 2 and flow out from the upper opening, which will not be repeated here.

[0037] When the upper portion of the spiral ribbon 2 is connected to the support rod 9, the support rod 9 extends to the lower end of the spiral ribbon 2 and is welded to the lower sealing plate 5. At the same time, the upper end of the support rod 9 and the lower sealing plate 5 are provided with corresponding through holes that communicate with each other. When the lower portion of the spiral ribbon 2 is connected to the main shaft 1, the corresponding through holes can be opened on the side of the spiral ribbon 2 or the side of the main shaft 1, or the through holes can be opened on the upper end of the upper sealing plate 4 or the lower end of the main shaft 1, as long as they can communicate with each other.

[0038] A vacuum dryer includes a ribbon stirrer, a container, and a motor. The stirrer is arranged in the container, and a main shaft 1 is connected to an external motor through a docking flange. The motor drives the stirrer to rotate.

[0039] In the description of this specification, the description with reference to the terms "one embodiment / method", "some embodiments / methods", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment / method or example are included in at least one embodiment / method or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment / method or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments / methods or examples. In addition, those skilled in the art may combine and combine different embodiments / methods or examples described in this specification and the features of different embodiments / methods or examples, unless they are contradictory.

[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0041] Those skilled in the art will appreciate that the above embodiments are merely intended to clearly illustrate the present invention and are not intended to limit the scope of the present invention. Other variations or modifications may be made based on the above disclosure, and such variations or modifications are still within the scope of the present invention.

Claims

1. A ribbon stirrer, characterized in that: It comprises a main shaft (1) and a screw belt (2), wherein the screw belt (2) is fixedly connected to the main shaft (1); The main shaft (1) is provided with a liquid inlet pipe for introducing a heating medium and a liquid outlet pipe for discharging the heating medium. The spiral ribbon (2) is provided with a heating channel (3) for accommodating the flow of the heating medium. The heating channel (3) has two openings, one of which is connected to the liquid inlet pipe and the other is connected to the liquid outlet pipe. The spiral belt (2) includes an upper sealing plate (4) and a lower sealing plate (5), and the heating channel (3) is located between the upper sealing plate (4) and the lower sealing plate (5); a plurality of protrusions (6) are provided on the upper sealing plate (4) and / or the lower sealing plate (5), and each of the protrusions (6) includes a crest portion (7) and a trough portion (8), the crest portion (7) is away from the sealing plate on the opposite side, and the trough portion (8) is close to the sealing plate on the opposite side, and the cavities between the crest portions (7) of adjacent protrusions (6) are connected to each other.

2. The ribbon stirrer according to claim 1, characterized in that The plurality of protrusions (6) are evenly arranged.

3. The ribbon stirrer according to claim 1, characterized in that The trough portion (8) of the protrusion (6) is spot-welded to the sealing plate on the opposite side.

4. The ribbon stirrer according to claim 1, characterized in that The periphery of the upper sealing plate (4) and the periphery of the lower sealing plate (5) are sealed by welding.

5. The ribbon stirrer according to claim 1, characterized in that A plurality of support rods (9) are provided between the main shaft (1) and the spiral belt (2), and one end of each support rod (9) is fixedly connected to the main shaft (1) and the other end is fixedly connected to the spiral belt (2).

6. The ribbon stirrer according to claim 5, characterized in that The spiral belt (2) is spirally arranged around the main shaft (1), and the distance between the spiral belt (2) and the main shaft (1) is larger at the top and smaller at the bottom. The two openings of the spiral belt (2) are respectively arranged on the upper and lower sides. The opening on the upper side of the spiral belt (2) is connected to the main shaft (1) through the support rod (9), and the opening on the lower side of the spiral belt (2) is directly connected to the main shaft (1).

7. A vacuum dryer, characterized in that: The invention comprises a ribbon stirrer as claimed in any one of claims 1 to 6.

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