CN104567301A - Vacuum rotary drying machine - Google Patents

Abstract

A vacuum rotary dryer is used to solve the problems of long drying time, low drying efficiency and uneven internal mixing of existing vacuum rotary dryers. It includes a machine base, a double-cone cylinder and a driving motor, and is characterized in that an auxiliary heating component is provided inside the double-cone cylinder and communicates with the inner cavity of the jacket, and the heat-capacity medium passes through it in an orderly manner. Add coils, cage pipes and the like inside the vacuum rotary dryer to play the role of indirect stirring when the dryer is rotating, and heat medium can also pass through the coils to increase the heating area of the equipment and improve the drying efficiency of the equipment , shorten the drying time.

Description

A vacuum rotary dryer

This patent application is a divisional application of the original invention patent application number: 2013105464987, the application date is November 7, 2013, the invention name is "a vacuum rotary dryer with double drying effect", and the publication number is CN103557680A.

technical field

The proposal relates to the field of vacuum rotary dryers, specifically a vacuum rotary dryer suitable for the pharmaceutical industry.

Background technique

The double-cone rotary vacuum dryer is a double-cone rotary tank. First, the air in the tank is drawn out to form a vacuum state. In the vacuum state, the tank is heated by passing steam or hot water into the tank jacket, and the heat passes through the tank. The inner wall is in indirect contact with the wet material in the tank, and the water vapor evaporated after the wet material absorbs heat is sucked away by the vacuum pump through the vacuum exhaust pipe, so that it dries while rolling, because the tank is in a vacuum state, and the tank body The rotation makes the materials turn up and down continuously, and accelerates the turning of the materials in the tank, so that the materials can be dried evenly and quickly.

However, in actual use, due to the limitation of the jacket, if you want to speed up the drying process, there are generally two ways to solve it, one is to increase the temperature of the heat medium in the jacket, and the other is to increase the flow rate of the heat medium in the jacket, but the above The means have a certain scope of application. One of the solutions can refer to the solution disclosed in CN102735030A.

In addition, there is still a problem in the application of the rotary vacuum dryer. The turning force of the wet material in the tank is not enough, which causes the extension of the drying time. For this reason, someone has designed a rotary vacuum dryer with a stirring mechanism to solve this problem. For details, see a solution disclosed in the patent CN201529252U.

Contents of the invention

In order to solve the problems of long drying time, low drying efficiency and uneven internal mixing of existing vacuum rotary dryers, the present invention provides a vacuum rotary dryer.

The technical solution adopted by the present invention to solve the technical problem is: a vacuum rotary dryer, including a machine base, a double-cone cylinder and a driving motor, and the two sides of the double-cone cylinder are rotatably installed on the machine base through bearing assemblies. , and the driving motor drives the double-cone cylinder to turn over through the transmission connection. There is a jacket through which the heat-capacity medium passes in the cylinder wall of the double-cone cylinder, and the two sides of the double-cone cylinder are respectively set There is a vacuum device extending to the inside of the double-cone cylinder, and a supply pipeline and a return pipeline for supplying heat medium connected to the inner cavity of the jacket. It is characterized in that a Auxiliary heating components through which the cavity passes through and the heat-capacity medium passes through in an orderly manner.

Further, after passing through the supply pipeline, the heat medium passes through the jacket and the auxiliary heating component simultaneously in a parallel manner, and flows out from the return pipeline after converging.

Further, the heat medium sequentially passes through the jacket and the auxiliary heating component in series after passing through the supply pipeline, and then flows out through the return pipeline.

Further, the heat medium sequentially passes through the auxiliary heating component and the jacket after passing through the supply pipeline, and then flows out through the return pipeline.

The auxiliary heating component is composed of criss-cross pipes and is in the shape of a cage matching the inner cavity of the double-cone cylinder, including an annular pipe and a support pipe, and the support pipe is directly fixedly connected with the double-cone cylinder.

The auxiliary heating component is a pipe with at least one channel, and the two ends of the pipe are respectively fixed on the inner wall of the double-cone cylinder.

The auxiliary heating component is an annular or helical coil.

The jacket has partitions to block the heat medium to form a certain flow path.

The outer surface of the auxiliary heating component is smooth and has no dead ends.

Key points: Add coils, cage pipes and other similar objects inside the vacuum rotary dryer to play the role of indirect stirring when the dryer is rotating, and heat medium can also be passed through the coils to increase the heating area of the equipment and improve the efficiency of the equipment. High drying efficiency and shorten drying time.

The beneficial effects of the present invention are: the core of this patent is a double-cone rotary vacuum dryer with a new technology improved and innovated on the basis of the ordinary double-cone rotary vacuum dryer. --On the basis of drying as a whole, the jacket of the original model is heated, and a hollow built-in heating method is also set. The heat medium enters the built-in heating tube and the jacket successively or simultaneously, and then reflows to realize two-way or double heating, which solves the low efficiency of heat transfer through the material, so it greatly improves the heat transfer of the material on the basis of promoting the sufficient heat exchange of the wet material. Thermal system, speeds up the drying rate. In addition, due to the existence of the auxiliary heating component, the wet material can form an effective collision with it, which can ensure that the material is evenly and fully dried, and effectively prevent the material from agglomerating and agglomerating to ensure product quality. Generally speaking, the heating area is increased, the turning strength is strengthened, and the drying time is shortened.

Description of drawings

Figure 1 is a full sectional view of Embodiment 1.

Fig. 2 is a side schematic view of Embodiment 1.

Fig. 3 is a partial enlarged view of I in Fig. 1 .

FIG. 4 is a schematic diagram of the second embodiment.

Fig. 5 is a schematic diagram of the third embodiment.

Fig. 6 is a schematic diagram of the fourth embodiment.

In the figure: 1 machine base, 2 double-cone cylinder, 21 installation part, 22 jacket, 23 return channel, 24 supply pipeline, 25 return pipeline, 26 bearing assembly, 27 sealing ring, 3 butterfly valve assembly, 4 feed Cover assembly, 5 rotary joints, 61 vacuum suction hood, 62 joints, 63 vacuum pipes, 64 temperature and pressure instruments, 7 auxiliary heating parts, 71 ring pipes, 72 support pipes, 73 branch pipes, 8 partitions, 81 flow holes , 9 drive motors, 91 chain drives.

Detailed ways

Embodiment 1, a best embodiment will be described below, as shown in Figures 1 to 3,

A vacuum rotary dryer includes a machine base 1, a double-cone cylinder body 2 and a driving motor 9. The structure is described in detail below.

The double-cone cylinder 2 is a cylindrical body with small ends and a large middle, and a butterfly valve assembly 3 and a feed cover assembly 4 are respectively installed at the two ports. The feed cover is a flange structure, and the butterfly valve assembly 3 and the feed cover assembly 4 All are prior art, and the skilled person can understand it according to the accompanying drawings of the present application.

There are installation parts 21 on both sides of the double cone cylinder body 2, and the installation parts are rotatably installed on the bearing seat of the machine base 1 through 26 bearing assemblies to form a fit, and a driving motor 9 drives the double cone through a chain transmission 91. The cylinder rotates to realize the function of turning over the double-cone cylinder. In the wall of the double-cone cylinder 2, there is a jacket 22 through which the heat medium passes, and a return pipe 23 is provided at the corresponding position, that is to say, the double-cone cylinder is composed of inner and outer layers and has an inner jacket. The cylinder structure, the return channel 23 is set on the same side of the heat medium source, and returns from both ends to the middle. On the left side of the double-cone cylinder body 2, there are supply pipelines 24 and return pipelines 25 for supplying heat medium that communicate with the jacket 22, and supply heat medium (such as hot water) to the jacket, wherein the return pipeline 25 and the supply pipeline Pipelines 24 are coaxially arranged (coaxially sleeved pipes), and are all located at the center of rotation, and rotate together with the double-cone cylinder. A sealing ring 27 is provided at the matching part of the sleeve 22 to realize sealing, and a rotary joint 5 and corresponding connecting pieces are provided at the outer end of the supply pipeline so as to supply hot water through the water inlet pipe.

One side of the double-cone cylinder 2 is provided with a vacuum device that extends to the inside of the double-cone cylinder. The vacuum device includes a vacuum suction cover 61, a joint 62, a vacuum pipeline 63 and related temperature and pressure instruments 64, wherein The vacuum suction cover 61 is located in the inner cavity of the double-cone cylinder, and is a static part, so it is necessary to implement a dynamic seal at the position where the vacuum pipeline 63 cooperates with the double-cone cylinder.

Inside the double-cone cylinder 2 is provided an auxiliary heating component 7 that communicates with the inner cavity of the jacket. The auxiliary heating component 7 is composed of vertically and horizontally intersecting tubes and is a cage that matches the inner cavity of the double-cone cylinder, including an annular tube 71 and a support tube 72, wherein the annular tube 71 is the main channel for the heat medium, and passes through The support pipe 72 is directly fixedly connected with the inner wall of the double-cone cylinder. In order to prevent the adhesion phenomenon, the outer surface of the auxiliary heating part and the inner wall of the double-cone cylinder are designed to be a smooth structure without dead ends, which is easy to achieve. In order to make the heat medium flow sequentially, it is necessary to install a partition 8 in the jacket 22 to block the heat medium so as to form a certain flow path, wherein the partition 8 is located in the jacket and divides the jacket into different subspaces, and ensures that there are Corresponding flow holes 81 carry out the flow of the liquid to realize the flow according to the predetermined route, see the arrow direction in Fig. 1 for details, wherein the dotted line part indicates the flow direction from the jacket.

This embodiment realizes that the heat medium passes through the supply pipeline 24 in a parallel manner and passes through the jacket 22 and the auxiliary heating component 7 at the same time, and confluences together at the return passage and flows out from the return pipeline 25, which is one of the implementation modes. .

Embodiment 2, as shown in Figure 4,

The difference from Embodiment 1 is that the auxiliary heating component 7 is a pipe fitting with a simpler structure. The partition plate 8 is designed to guide the flow of the heat medium, and the flow direction of the heat medium can refer to the situation shown in FIG. 4 , where the dotted arrow indicates the flow mode in the jacket. It is easy to understand that in order to make the heat medium flow according to a certain flow route, the pattern of the separator can be designed to be spiral or partially spiral.

It is easy to imagine that the branch pipes can also use spiral pipes to increase the heat dissipation area.

Embodiment three, as shown in Figure 5,

The difference from Embodiment 2 is that the heat medium passes through the supply pipeline 24 and then passes through the auxiliary heating component 7 and the jacket 22 sequentially in series, and then flows out from the return pipeline. The specific path is shown by the arrow in FIG. 5 , where the dotted arrow indicates the flow mode in the jacket, pay attention to the position and mode of the partition.

Embodiment 4, as shown in Figure 6,

After passing through the supply pipeline, the heat medium sequentially passes through the jacket 22, the auxiliary heating component 7 and the jacket 22 in series, and then flows out from the return pipeline. The specific path is shown by the arrow in Figure 6, where the dashed arrow indicates The flow pattern in the jacket.

Wherein the auxiliary heating part is preferably made of stainless steel pipe.

Through the above description, it is easy to understand that due to the auxiliary heating parts inside, when the dryer is rotating, the coil plays a role of stirring to a certain extent, which strengthens the stirring of materials, especially for slightly viscous or moisture-rich materials. It is evenly heated, making the material easier to dry, shortening the drying time and improving work efficiency.

The advantage of the present invention is illustrated below by a group of experimental data:

1. The equipment is used for the drying of ribavirin

 Material Name: Ribavirin

Wet material composition: ribavirin 70%, alcohol 28%, water 2%

Final moisture: 0.4% (alcohol)

The specific gravity of dry product: 0.4kg

Temperature: 60-120℃

Capacity: 450kg/batch

Viscosity: wet material is slightly sticky, dry product is not sticky

Under the same heat medium and temperature, the drying time of ordinary dryer is 10-13 hours, and the drying time of using the equipment of the present invention is 6-8 hours after verification.

2. The equipment is used for the drying of tetraacetyl ribose

Material name: Tetraacetyl ribose

Wet material composition: tetraacetyl ribose 72%, water 18%

Final moisture: 0.5%

The specific gravity of dry product: 0.6kg

Temperature: 60-65℃

Capacity: 600kg/batch

Viscosity: Wet products are non-sticky, dry products are non-sticky

Under the same heat medium and temperature, the drying time of ordinary dryer is 19-22 hours, and it is verified that the drying time of the device of the present invention is 12-15 hours.

3. The equipment is used for the drying of methyl triazole carboxylate

 Material Name: Methyl triazole carboxylate

Wet material composition: methyl triazole carboxylate 80%, methanol 15%, water 5%

Final moisture: 0.4% (water)

The specific gravity of dry product: 0.5kg

Temperature: 60-110℃

Capacity: 500kg/batch

Viscosity: wet material is slightly sticky, dry product is not sticky

Under the same heat medium and temperature, the drying time of ordinary dryer is 15-18 hours, and the drying time of using the device of the present invention is 7-10 hours after verification.

The above-mentioned embodiments are only descriptions of preferred implementations of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, those skilled in the art may make various modifications and improvements to the present invention. All should expand in the scope of protection as defined in the claims of the present invention.

Claims (6)

1. a vacuum rotary drying machine, comprise support, double-cone tube body and drive motors, described double-cone tube body both sides are arranged on support by bearing assembly is rotating, and drive motors drives double-cone tube body to overturn by being in transmission connection, there is the chuck that an appearance thermal medium passes through in the barrel of described double-cone tube body, and supply line and the return line of vacuum extractor and the supply thermal medium through with chuck inner chamber extending to double-cone tube body inside is respectively equipped with in the both sides of described double-cone tube body, it is characterized in that, be provided with in described double-cone tube body inside one with chuck inner chamber through and hold the auxiliary heating parts that thermal medium passes through in order, described thermal medium sequentially passes through chuck and auxiliary heating parts in the mode of serial connection after supply line, and flowed out by return line.

2. a kind of vacuum rotary drying machine according to claim 1, it is characterized in that, described auxiliary heating parts by the pipe fitting intersected in length and breadth form and with the caged that double-cone tube body inner chamber matches, comprise ring pipe and stay pipe, described stay pipe is directly fixedly connected with double-cone tube body.

3. a kind of vacuum rotary drying machine according to claim 1, is characterized in that, described auxiliary heating parts is the pipe fitting at least with a passage, and the two ends of described pipe fitting are separately fixed on the inwall of double-cone tube body.

4. a kind of vacuum rotary drying machine according to claim 1, is characterized in that, described auxiliary heating parts is annular or a spiral coil pipe.

5. a kind of vacuum rotary drying machine according to claim 1, is characterized in that, has and stop that thermal medium makes it to be formed the dividing plate of certain glide path in described chuck.

6. a kind of vacuum rotary drying machine according to claim 1, is characterized in that, the outer surface of described auxiliary heating parts is smooth and without dead angle.