An external loop vacuum evaporator

Abstract

The utility model relates to evaporator technical field, concretely is a kind of outer circulation vacuum evaporator, including evaporator body, one serpentine pipe is installed in the evaporator body inside, one additional heating tank is fixedly connected in the evaporator body outside, heating plate is installed on the inner wall in additional heating tank, one conveying pipe is installed in additional heating tank inside, conveying pipe is serpentine arrangement in additional heating tank inside, conveying pipe is inserted into evaporator body inside. The utility model is provided with serpentine pipe in the evaporator body inside, and additional heating tank with heating plate and serpentine arrangement conveying pipe are equipped outside, and conveying pipe is set along serpentine pipe in evaporator body, and the heating circulation system of inside and outside cooperation is formed;The stirring mechanism of both sides can be fully stirred to material, make material evenly heated, avoid local overheating.

Description

Technical Field

[0001] This utility model relates to the field of evaporator technology, specifically to an external circulation vacuum evaporator. Background Technology

[0002] In the production processes of the food, pharmaceutical, and chemical industries, it is often necessary to concentrate solutions to increase material concentration, separate solvents, or purify active ingredients. External circulation vacuum evaporators, due to their ability to achieve efficient evaporation at low temperatures, have become important equipment for processing heat-sensitive materials.

[0003] Existing technology, such as patent application number CN202322926849.9, discloses an external circulation vacuum evaporator for fragrance extraction, comprising: an evaporation box, an evaporation tube, and a condenser connected in sequence. A shell for steam collection is installed between the evaporation box and the evaporation tube. A piston and a retaining ring are installed in the shell from top to bottom, forming a steam channel for steam flow between the piston and the retaining ring. When the piston rises and falls, it is used to open or block the steam channel. This utility model, through the addition of a steam channel, piston, and retaining ring, achieves... The piston can open and close the steam passage on the baffle ring. When the steam pressure in the evaporator is higher than the predetermined value, the steam pushes the piston up on the baffle ring, facilitating the discharge of steam from the evaporator through the evaporation tubes. When the steam pressure in the evaporator is lower than the predetermined value, the piston blocks the baffle ring to prevent the steam pressure in the evaporator from becoming too low. However, this external circulation vacuum evaporator has several shortcomings in practical applications: Firstly, the heating system often uses one or more vertically arranged circulating heat-conducting pipes to heat the raw materials inside the evaporator, resulting in a limited heat exchange area, slow material evaporation, and high energy consumption. Secondly, the material is prone to localized overheating within the evaporator body due to poor flow, especially high-viscosity materials, which are prone to adhering and scaling on the heating surface. This not only affects heat transfer efficiency but may also lead to material denaturation and reduced product quality.

[0004] In view of this, we propose an external circulation vacuum evaporator. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides an external circulation vacuum evaporator.

[0006] The technical solution of this utility model is:

[0007] An external circulation vacuum evaporator includes an evaporator body, an evaporator body with a serpentine tube installed inside, an external heating box fixedly connected to the outside of the evaporator body, a heating plate installed on the inner wall of the external heating box, a delivery pipe installed inside the external heating box in a serpentine arrangement, the delivery pipe extending into the evaporator body, the portion of the delivery pipe inside the evaporator body located within the serpentine tube and arranged along the serpentine tube, a circulation pump installed on the delivery pipe located outside the external heating box, a heat transfer fluid transfer box installed on the delivery pipe located inside the external heating box, a stirring mechanism installed on both sides of the serpentine tube inside the evaporator body, and a vacuum pump installed outside the evaporator body, the vacuum pump inlet having an extraction pipe communicating with the inside of the evaporator body. By setting a serpentine tube inside the evaporator body, equipping it with an external heating box with heating plates and a serpentine arrangement of the delivery pipe, with the delivery pipe arranged along the serpentine tube inside the evaporator body, a coordinated internal and external heating circulation system is formed. A circulating pump drives the heat transfer fluid to flow between the delivery pipe and the external heating box. The heat transfer fluid transfer box ensures a stable supply of heat transfer fluid. The combination of external heating and internal serpentine tube heating greatly improves the heat exchange efficiency. The stirring mechanisms on both sides can fully stir the material, so that the material is heated evenly and avoids local overheating.

[0008] As a preferred technical solution, a feeding pipe and an exhaust pipe are installed on the top of the evaporator body, and a flange is installed on both the feeding pipe and the exhaust pipe. The feeding pipe facilitates the rapid and stable addition of materials; the exhaust pipe can promptly discharge the gas generated inside the evaporator.

[0009] As a preferred technical solution, an insulation block is fixedly installed on both sides of the top of the external heating box, and the infusion pipe connected to the circulation pump is located inside the insulation block. The insulation block effectively reduces heat loss from the heat-conducting fluid inside the infusion pipe.

[0010] As a preferred technical solution, a cover is threaded onto the top of the heat transfer fluid transfer box, and an opening is provided on the front side of the external heating box, with a front cover plate fixed to the opening by bolts. The threaded connection design of the cover facilitates opening the transfer box for internal cleaning, inspection, or replacement of the heat transfer fluid. The front cover plate is fixed by bolts, facilitating maintenance and repair of the heat transfer fluid transfer box and surrounding components inside the external heating box.

[0011] As a preferred technical solution, a medium adding hopper is installed near the top of the outer wall of the external heating box, and a funnel cover is threaded onto the top of the medium adding hopper. A waste liquid pipe is installed at the bottom of the external heating box, and a waste liquid valve is installed on the waste liquid pipe. The medium adding hopper is used to replenish the heat transfer medium in the heat transfer medium transfer tank or the external heating box, while the waste liquid pipe and waste liquid valve facilitate the periodic discharge of waste heat transfer medium or cleaning waste liquid from the external heating box.

[0012] As a preferred technical solution, the stirring mechanism includes a stirring shaft rotatably mounted on the inner wall of the top of the evaporator, with several stirring blades fixedly mounted on the outer circumference of the stirring shaft. A stirring motor is mounted on the top of the evaporator body, and the output shaft of the stirring motor is coaxially fixed with the stirring shaft. The stirring mechanism consists of a stirring shaft, stirring blades, and a stirring motor. The stirring motor drives the stirring shaft to rotate, which in turn drives the stirring blades to stir the material inside the evaporator body, making the material heated more evenly and accelerating the evaporation rate.

[0013] As a preferred technical solution, the output shafts of the two stirring motors rotate in opposite directions. The opposing rotating stirring blades can create a convective stirring effect within the evaporator body, making the materials more thoroughly mixed, reducing dead zones, and further enhancing the fluidity and heating uniformity of the materials.

[0014] As a preferred technical solution, a base is fixedly installed at the bottom of the evaporator body, and several support legs arranged in a circular array are installed at the bottom of the base. This improves the stability of the equipment placement, prevents the equipment from tipping over due to vibration or external forces during operation, and ensures production safety.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] This invention features a serpentine tube inside the evaporator body, an external heating box with a heating plate, and a serpentine arrangement of conveying pipes, forming a coordinated internal and external heating circulation system. A circulating pump drives the heat transfer fluid between the conveying pipes and the external heating box, while a heat transfer fluid transfer tank ensures a stable supply. The combination of external heating and internal serpentine tube heating significantly improves heat exchange efficiency. Stirring mechanisms on both sides thoroughly mix the materials, ensuring uniform heating and preventing localized overheating. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 In this utility model Figure 2 Internal structure diagram;

[0019] Figure 3This is a top view of the interior of the evaporator body in this utility model;

[0020] Figure 4 This is a schematic diagram of the internal structure of the heat transfer fluid transfer box in this utility model;

[0021] The meanings of the labels in the diagram are as follows:

[0022] 1. Evaporator body; 10. Feed pipe; 11. Exhaust pipe; 12. Stirring motor; 120. Stirring shaft; 121. Stirring blade; 13. Serpentine tube; 2. Vacuum pump; 20. Suction pipe; 3. External heating box; 30. Medium addition hopper; 31. Funnel cover; 32. Circulation pump; 33. Insulation block; 34. Front cover plate; 35. Waste liquid pipe; 36. Waste liquid valve; 37. Conveying pipe; 38. Heating plate; 39. Heat transfer fluid transfer box; 390. Box cover; 4. Base; 40. Support leg. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figures 1-4 This utility model provides a technical solution:

[0025] An external circulation vacuum evaporator includes an evaporator body 1, a serpentine tube 13 installed inside the evaporator body 1, an external heating box 3 fixedly connected to the outside of the evaporator body 1, a heating plate 38 installed on the inner wall of the external heating box 3, a delivery pipe 37 installed inside the external heating box 3, the delivery pipe 37 is arranged in a serpentine pattern inside the external heating box 3, the delivery pipe 37 extends into the evaporator body 1, the portion of the delivery pipe 37 inside the evaporator body 1 is located inside the serpentine tube 13 and is arranged along the serpentine tube 13, a circulation pump 32 is installed on the delivery pipe 37, the circulation pump 32 is located outside the external heating box 3, a heat transfer liquid transfer box 39 is installed on the delivery pipe 37, the heat transfer liquid transfer box 39 is located inside the external heating box 3, a stirring mechanism is installed on both sides of the serpentine tube 13 inside the evaporator body 1, a vacuum pump 2 is installed outside the evaporator body 1, and an exhaust pipe 20 communicating with the inside of the evaporator body 1 is installed at the air inlet of the vacuum pump 2. By installing a serpentine tube 13 inside the evaporator body 1, and equipping an external heating box 3 with a heating plate 38 and a serpentine conveying pipe 37 on the outside, with the conveying pipe 37 arranged along the serpentine tube 13 inside the evaporator body 1, a coordinated internal and external heating circulation system is formed. The circulating pump 32 drives the heat transfer fluid to flow between the conveying pipe 37 and the external heating box 3, and works with the heat transfer fluid transfer box 39 to ensure a stable supply of heat transfer fluid. The combination of external heating and internal heating through the serpentine tube 13 significantly improves heat exchange efficiency. The stirring mechanisms on both sides can fully stir the material, making the material heated evenly and avoiding local overheating.

[0026] In a preferred embodiment, the top of the evaporator body 1 is equipped with a feed pipe 10 and an exhaust pipe 11, both of which are fitted with a flange. The feed pipe 10 facilitates the rapid and stable addition of materials; the exhaust pipe 11 can promptly discharge the gas generated inside the evaporator.

[0027] In a preferred embodiment, an insulation block 33 is fixedly installed on both sides of the circulating pump 32 at the top of the external heating box 3, and the infusion pipe connected to the circulating pump 32 is located inside the insulation block 33. The insulation block 33 can effectively reduce the heat loss of the heat-conducting liquid inside the infusion pipe.

[0028] In a preferred embodiment, a cover 390 is threaded onto the top of the heat transfer fluid transfer box 39. An opening is provided on the front side of the external heating box 3 at the front of the heat transfer fluid transfer box 39, and a front cover plate 34 is bolted to the opening. The threaded connection design of the cover 390 facilitates opening the transfer box for internal cleaning, inspection, or replacement of the heat transfer fluid. The bolted front cover plate 34 facilitates maintenance and repair of the heat transfer fluid transfer box 39 and surrounding components inside the external heating box 3.

[0029] In a preferred embodiment, a medium adding hopper 30 is installed near the top of the outer wall of the external heating box 3, and a funnel cover 31 is threaded onto the top of the medium adding hopper 30. A waste liquid pipe 35 is installed at the bottom of the external heating box 3, and a waste liquid valve 36 is installed on the waste liquid pipe 35. The medium adding hopper 30 is used to replenish the heat transfer medium in the heat transfer medium transfer box 39 or the external heating box 3, while the waste liquid pipe 35 and the waste liquid valve 36 facilitate the periodic discharge of waste heat transfer medium or cleaning waste liquid from the external heating box 3.

[0030] In a preferred embodiment, the stirring mechanism includes a stirring shaft 120 rotatably mounted on the inner wall of the top of the evaporator. A plurality of stirring blades 121 are fixedly mounted on the outer circumference of the stirring shaft 120. A stirring motor 12 is mounted on the top of the evaporator body 1, and the output shaft of the stirring motor 12 is coaxially fixed with the stirring shaft 120. The stirring mechanism consists of the stirring shaft 120, the stirring blades 121, and the stirring motor 12. The stirring motor 12 drives the stirring shaft 120 to rotate, thereby causing the stirring blades 121 to stir the material inside the evaporator body 1, making the material heat more evenly and accelerating the evaporation rate.

[0031] In this preferred embodiment, the output shafts of the two stirring motors 12 rotate in opposite directions. The opposing rotating stirring blades 121 can create a convective stirring effect within the evaporator body 1, making the material mix more thoroughly, reducing dead zones in the stirring, and further enhancing the fluidity and uniformity of the material heating.

[0032] In a preferred embodiment, a base 4 is fixedly installed at the bottom of the evaporator body 1, and a plurality of support legs 40 arranged in a circular array are installed at the bottom of the base 4. This improves the stability of the equipment placement, prevents the equipment from tipping over due to vibration or external forces during operation, and ensures production safety.

[0033] When using the external circulation vacuum evaporator of this utility model, firstly, the material to be processed is added into the evaporator body 1 through the feeding pipe 10 at the top of the evaporator body 1.

[0034] The heating plate 38 inside the external heating box 3 starts working, heating the heat transfer medium inside the box, and then transferring the heat to the delivery pipe 37. After the circulation pump 32 starts, the heat transfer liquid first absorbs heat through the delivery pipe 37 inside the external heating box 3, and then enters the evaporator body 1 through the delivery pipe 37, flowing along the path of the serpentine tube 13. Since the delivery pipe 37 is located inside the serpentine tube 13, it transfers heat to the material inside the evaporator body 1. The heat transfer liquid transfer box 39 plays a role in stabilizing the supply and buffering during the circulation process, ensuring the continuity of the heat transfer liquid circulation.

[0035] During the heating process, the stirring mechanisms on both sides of the serpentine tube 13 inside the evaporator body 1 operate synchronously, so that the material is fully mixed in the evaporator body 1, avoiding local overheating, while enhancing the contact between the material and the surface of the serpentine tube 13, accelerating heat transfer and solvent vaporization.

[0036] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An external circulation vacuum evaporator, comprising an evaporator body (1), characterized in that: The evaporator body (1) has a serpentine tube (13) installed inside. An external heating box (3) is fixedly connected to the outside of the evaporator body (1). A heating plate (38) is installed on the inner wall of the external heating box (3). A conveying pipe (37) is installed inside the external heating box (3). The conveying pipe (37) is arranged in a serpentine pattern inside the external heating box (3). The conveying pipe (37) extends into the evaporator body (1). The part of the conveying pipe (37) inside the evaporator body (1) is located inside the serpentine tube (13) and is arranged along the serpentine tube (13). The conveying pipe (37) is equipped with a circulation pump (32), which is located outside the external heating box (3). The conveying pipe (37) is equipped with a heat transfer liquid transfer box (39), which is located inside the external heating box (3). The evaporator body (1) is equipped with a stirring mechanism on both sides of the serpentine tube (13). The evaporator body (1) is equipped with a vacuum pump (2), which is connected to the inside of the evaporator body (1) by an air extraction pipe (20) at its inlet.

2. The external circulation vacuum evaporator as described in claim 1, characterized in that: The top of the evaporator body (1) is equipped with a feed pipe (10) and an exhaust pipe (11), and a flange is installed on both the feed pipe (10) and the exhaust pipe (11).

3. The external circulation vacuum evaporator as described in claim 2, characterized in that: The top of the external heating box (3) is fixedly installed with a heat preservation block (33) on both sides of the circulating pump (32), and the infusion pipe connected to the circulating pump (32) is located inside the heat preservation block (33).

4. The external circulation vacuum evaporator as described in claim 3, characterized in that: The top of the heat transfer fluid transfer box (39) is threaded with a box cover (390). The external heating box (3) has an opening on the front side of the heat transfer fluid transfer box (39), and a front cover plate (34) is fixedly installed at the opening by bolts.

5. The external circulation vacuum evaporator as described in claim 4, characterized in that: A medium adding hopper (30) is installed on the outer wall of the external heating box (3) near the top, and a funnel cover (31) is threaded on the top of the medium adding hopper (30). A waste liquid pipe (35) is installed at the bottom of the external heating box (3), and a waste liquid valve (36) is installed on the waste liquid pipe (35).

6. The external circulation vacuum evaporator as described in claim 5, characterized in that: The stirring mechanism includes a stirring shaft (120) rotatably mounted on the inner wall of the top of the evaporator. Several stirring blades (121) are fixedly mounted on the outer circumference of the stirring shaft (120). A stirring motor (12) is mounted on the top of the evaporator body (1). The output shaft of the stirring motor (12) is coaxially fixed with the stirring shaft (120).

7. The external circulation vacuum evaporator as described in claim 6, characterized in that: The output shafts of the two stirring motors (12) rotate in opposite directions.

8. The external circulation vacuum evaporator as described in claim 7, characterized in that: The evaporator body (1) has a base (4) fixedly installed at the bottom, and the base (4) has several legs (40) arranged in a circular array at the bottom.

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