Vacuum type spiral heating dryer

Abstract

The utility model provides a vacuum type spiral heating dryer, and belongs to the technical field of dryers. Comprising a shell, a spiral rotating shaft is arranged in the shell, a filter box and a vacuumizing pump communicated with the filter box are arranged at the top of the shell, a filter screen is arranged between the inner side walls of the filter box, and a vacuumizing opening inserted into the shell is formed in the bottom of the filter box; air spraying pipes arranged on the outer sides of the spiral rotating shafts are arranged at the corners of the two sides of the top of the shell, a discharging pipe is arranged on one side of the vacuumizing pump, and a pipe opening in one end of each air spraying pipe penetrates out of the shell and is provided with a T-shaped connecting pipe communicated with the discharging pipe. According to the spiral heating dryer, the exhaust pipe is communicated with the T-shaped connecting pipe, the vacuumizing pump is started, residual air in the shell is conveyed to the air spraying pipe and is sprayed out through the air spraying heads, shutdown for manual cleaning is not needed, time and labor are saved, the working efficiency is improved, the interior of the spiral heating dryer is still kept in a vacuum negative pressure state, and the service life of the spiral heating dryer is prolonged. And heating and drying of the materials are not affected.

Description

Technical Field

[0001] The utility model provides a vacuum spiral heating dryer, belonging to the technical field of dryers. Background Art

[0002] Spiral heating drying is an indirect heat transfer dryer that transfers the heat of the heat carrier to the wet material through the spiral groove and the metal wall of the spiral jacket, so that the moisture in it is vaporized and dried. It is suitable for drying materials that are not allowed to be contaminated or deteriorated, and is widely used in the fields of pharmaceutical intermediates, traditional Chinese medicine, sterile powder and food drying and processing.

[0003] The existing spiral heating dryer can basically meet the use needs. At present, in order to improve the drying efficiency, a vacuum pump is usually added to communicate with the inside of the spiral heating dryer, and then the inside of the spiral heating dryer is vacuumed to make it in a vacuum negative pressure state. However, during use, since the material has a certain humidity, it is inevitable that the material will adhere to the inner wall of the outer shell of the spiral heating dryer and the spiral rotating shaft. The traditional cleaning method is mostly manual cleaning after shutdown, but manual cleaning is not only time-consuming and laborious, but also has low cleaning efficiency. Moreover, after the machine is shut down and restarted, it is necessary to re-vacuum it, which affects the material heating and drying efficiency. Based on this, the utility model provides a vacuum spiral heating dryer. Utility Model Content

[0004] The technical problem solved by the utility model is that manual cleaning after shutdown is not only time-consuming and labor-intensive, but also has low cleaning efficiency. Moreover, when the machine is restarted after shutdown, vacuuming needs to be performed again, which affects the heating and drying efficiency of the material.

[0005] In order to solve the technical problem, the technical solution provided by the utility model is: a vacuum spiral heating dryer, comprising an outer shell, a spiral rotating shaft is arranged in the outer shell, a filter box and a vacuum pump connected to the filter box are arranged on the top of the outer shell, a filter screen is arranged between the inner walls of the filter box, a vacuum port inserted into the outer shell is arranged at the bottom of the filter box, air jet pipes placed on the outside of the spiral rotating shaft are arranged at the corners on both sides of the top of the outer shell, an exhaust pipe is arranged on one side of the vacuum pump, and one end of the air jet pipe passes through the outer shell and is provided with a T-shaped connecting pipe connected to the exhaust pipe.

[0006] Furthermore, an inlet is provided on one side of the top of the shell, an outlet is provided on the other side of the bottom of the shell, one end of the spiral rotating shaft is rotatably connected to a side wall of the shell, and a motor is provided on the other side of the shell, and the output end of the motor is fixedly connected to the other end of the spiral rotating shaft.

[0007] Furthermore, a blowing fan is provided on the top wall of the filter box.

[0008] Furthermore, the side wall of the filter box is provided with a delivery pipe which is placed above the filter net and connected to the top of the vacuum pump.

[0009] Furthermore, the discharge pipe is connected to the T-shaped connecting pipe via a three-way joint, a three-way control valve is provided on the three-way joint, and an extension pipe is provided at the other outlet of the three-way joint.

[0010] Furthermore, a plurality of air spray heads are equidistantly arranged on the air spray pipe.

[0011] Furthermore, a heating jacket is provided on the shell to provide a heating source so as to heat the material to be dried. This structure is a prior art and will not be described in detail.

[0012] Beneficial effects of the utility model:

[0013] By operating the three-way control valve to connect the discharge pipe with the T-type connecting pipe, the vacuum pump is started, and the remaining air in the shell is transported to the spray pipe through the conveying pipe, vacuum pump, discharge pipe, three-way joint, and T-type connecting pipe, and is sprayed out through multiple spray heads, so that the materials adhering to the inner wall of the shell and the spiral rotating shaft can be cleaned during the drying process without stopping the machine for manual cleaning, which not only saves time and labor and improves work efficiency, but also the interior of the spiral heating dryer still maintains a vacuum negative pressure state, which will not affect the heating and drying of the materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The utility model is a structural schematic diagram of a vacuum spiral heating dryer.

[0015] Figure 2 It is a plan view of a vacuum spiral heating dryer of the utility model.

[0016] 1. Outer shell; 2. Screw shaft; 3. Filter box; 4. Vacuum pump; 5. Filter screen; 6. Vacuum port; 7. Air spray pipe; 8. Exhaust pipe; 9. T-type connecting pipe; 10. Inlet; 11. Outlet; 12. Motor; 13. Blowing fan; 14. Delivery pipe; 15. Three-way connector; 16. Three-way control valve; 17. Extension pipe; 18. Air spray head. DETAILED DESCRIPTION

[0017] The utility model is further described below in conjunction with the accompanying drawings.

[0018] According to the attached Figure 1 , 2As shown: The utility model provides a vacuum spiral heating dryer: it includes a shell 1, a spiral rotating shaft 2 is arranged in the shell 1, an inlet 10 is arranged on one side of the top of the shell 1, and an outlet 11 is arranged on the other side of the bottom of the shell 1. One end of the spiral rotating shaft 2 is rotatably connected to a side wall of the shell 1, and a motor 12 is arranged on the other side of the shell 1. The output end of the motor 12 is fixedly connected to the other end of the spiral rotating shaft 2. A heating jacket is provided on the shell. By connecting an external hot steam source with the heating jacket, a heating source is provided to heat the material to be dried. The material to be dried is added into the shell 1 from the inlet 10, and the motor 12 is started to drive the spiral rotating shaft 2 to rotate, thereby continuously moving the material forward. During the movement, the material keeps full contact with the heating source, thereby heating and drying the material.

[0019] According to the attached Figure 2 As shown: a filter box 3 and a vacuum pump 4 connected to the filter box 3 are provided on the top of the shell 1, a filter screen 5 is provided between the inner side walls of the filter box 3, a vacuum port 6 inserted into the shell 1 is provided at the bottom of the filter box 3, a discharge pipe 8 is provided on one side of the vacuum pump 4, and a blowing fan 13 is provided on the top wall of the filter box 3. The blowing fan 13 is used to blow air to the filter screen 5, and then the tiny granular materials adhering to the bottom of the filter screen 5 are blown downward, so that the materials fall off the filter screen 5 to avoid clogging the filter screen 5 and affecting the working efficiency of extracting the gas in the shell 1. A conveying pipe 14 is provided on the side wall of the filter box 3, which is placed above the filter screen 5 and connected to the top of the vacuum pump 4. By starting the vacuum pump 4, the gas in the shell 1 flows upward through the vacuum port 6 and the filter screen 5, and the gas filtered by the filter screen 5 is discharged to the outside through the conveying pipe 14, the vacuum pump 4 and the discharge pipe 8.

[0020] According to the attached Figure 1 , 2 As shown: both corners on the top of the shell 1 are provided with a spray pipe 7 placed on the outside of the spiral rotating shaft 2, one end of the spray pipe 7 passes through the shell 1 and is provided with a T-shaped connecting pipe 9 connected to the discharge pipe 8, the discharge pipe 8 and the T-shaped connecting pipe 9 are connected through a three-way joint 15, the three-way joint 15 is provided with a three-way control valve 16, the other outlet of the three-way joint 15 is provided with an extension pipe 17, and a plurality of spray heads 18 are equidistantly provided on the spray pipe 7. The discharge pipe 8 is connected to the T-shaped connecting pipe 9 by operating the three-way control valve 16, and the vacuum pump 4 is started. The remaining air in the shell 1 is transported to the spray pipe 7 through the conveying pipe 14, the vacuum pump 4, the discharge pipe 8, the three-way joint 15, and the T-shaped connecting pipe 9, and is sprayed out through the plurality of spray heads 18, so that the materials adhering to the inner wall of the shell 1 and the spiral rotating shaft 2 can be cleaned during the drying process.

[0021] Principle of the utility model

[0022] By operating the three-way control valve 16 to connect the discharge pipe 8 with the extension pipe 17, the vacuum pump 4 is started, and the gas in the shell 1 is discharged to the outside through the vacuum port 6, the conveying pipe 14, the vacuum pump 4, the discharge pipe 8, and the extension pipe 17, so that the inside of the shell 1 is in a vacuum negative pressure state to quickly dry the material, so that the moisture in the material continuously absorbs heat and evaporates, thereby achieving the purpose of drying and dehydration.

[0023] When it is necessary to clean the materials adhered to the inner wall of the shell 1 and the spiral rotating shaft 2, the three-way control valve 16 is operated to connect the discharge pipe 8 with the T-type connecting pipe 9, and the vacuum pump 4 is started. The remaining air in the shell 1 is transported to the spray pipe 7 through the conveying pipe 14, the vacuum pump 4, the discharge pipe 8, the three-way joint 15, and the T-type connecting pipe 9, and is sprayed out through multiple spray heads 18, so that the materials adhered to the inner wall of the shell 1 and the spiral rotating shaft 2 can be cleaned during the drying process without stopping the machine for manual cleaning, which not only saves time and labor and improves the cleaning efficiency, but also the interior of the spiral heating dryer still maintains a vacuum negative pressure state, which will not affect the material heating and drying efficiency.

[0024] The above description of the utility model and its implementation methods is not restrictive. The drawings show only one implementation method of the utility model, and the actual structure is not limited thereto. In short, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the invention of the utility model, they should all fall within the protection scope of the utility model.

Claims

1. A vacuum spiral heating dryer, comprising a housing (1), wherein a spiral rotating shaft (2) is arranged in the housing (1), characterized in that: The top of the shell (1) is provided with a filter box (3) and a vacuum pump (4) connected to the filter box (3); a filter screen (5) is provided between the inner side walls of the filter box (3); the bottom of the filter box (3) is provided with a vacuum port (6) inserted into the shell (1); both sides of the top corner of the shell (1) are provided with a spray pipe (7) placed outside the spiral rotating shaft (2); one side of the vacuum pump (4) is provided with a discharge pipe (8); one end of the spray pipe (7) passes through the shell (1) and is provided with a T-shaped connecting pipe (9) connected to the discharge pipe (8).

2. A vacuum spiral heating dryer according to claim 1, characterized in that: An inlet (10) is provided on one side of the top of the shell (1), an outlet (11) is provided on the other side of the bottom of the shell (1), one end of the spiral rotating shaft (2) is rotatably connected to a side wall of the shell (1), and a motor (12) is provided on the other side of the shell (1), and an output end of the motor (12) is fixedly connected to the other end of the spiral rotating shaft (2).

3. The vacuum spiral heating dryer according to claim 1, characterized in that: The inner top wall of the filter box (3) is provided with a blowing fan (13).

4. The vacuum spiral heating dryer according to claim 1, characterized in that: The side wall of the filter box (3) is provided with a delivery pipe (14) which is placed above the filter screen (5) and is connected to the top of the vacuum pump (4).

5. The vacuum spiral heating dryer according to claim 1, characterized in that: The discharge pipe (8) is connected to the T-shaped connecting pipe (9) via a three-way joint (15), a three-way control valve (16) is provided on the three-way joint (15), and an extension pipe (17) is provided at the other outlet of the three-way joint (15).

6. The vacuum spiral heating dryer according to claim 1, characterized in that: The air spray pipe (7) is provided with a plurality of air spray heads (18) at equal intervals.

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