CN114011097A

CN114011097A - Thin film evaporator adopting rotary joint scraper device

Info

Publication number: CN114011097A
Application number: CN202111483492.0A
Authority: CN
Inventors: 张金保; 陆立; 胡国宏; 王炜昕
Original assignee: Wuxi Lima Chemical Machinery Co ltd
Current assignee: Wuxi Lima Chemical Machinery Co ltd
Priority date: 2021-12-07
Filing date: 2021-12-07
Publication date: 2022-02-08

Abstract

The invention relates to a film evaporator adopting a rotary joint scraper device, which comprises an evaporator cylinder, wherein the top of the evaporator cylinder is hermetically connected with a rack, the bottom of the evaporator cylinder is hermetically connected with an end socket, a main shaft is rotatably arranged in the evaporator cylinder, a motor is arranged at the top of the rack, and a power output shaft of the motor is downwards connected with the upper end of the main shaft; the main shaft drives the metal scraper device to rotate through the rotor; the lower end of the main shaft is communicated with the rotary joint in a sealing way. The scraper crystallizer is compact in structure, and the scraper crystallizer is made of titanium materials, so that the corrosion resistance is improved; the rotor structure adopts arc draw-in groove hinge type, easy dismounting, and scraper blade and section of thick bamboo wall adopt the shovel wall form, can self-cleaning. The upper end and the lower end are sealed by a double-end-face mechanical sealing structure, and meanwhile, a heating medium is also introduced into the rotor rotating shaft, so that heat exchange is carried out inside and outside, and the heat exchange area is increased; in order to prevent the product from changing, realize the inside heat medium that leads to of rotor rotation axis, design novel rotary joint structure.

Description

Thin film evaporator adopting rotary joint scraper device

Technical Field

The invention belongs to the technical field of evaporators, and relates to a film evaporator adopting a rotary joint scraper device.

Background

The film evaporator is a device which is applied to the industries of petrochemical industry, pharmacy, food processing and the like and is used for removing volatile matters and distilling products from liquid-state feeding materials and solid-state discharging materials, the film evaporator can carry out falling film evaporation under the vacuum condition by forcibly forming a film through a rotary scraper, and the film evaporator is widely applied to the industries of chemical industry, petrochemical industry, medicines, pesticides, daily chemicals, food, fine chemical industry and the like. With the development of the chemical industry, the chemical equipment is continuously accelerated to update and develop equipment more suitable for the process, and the thin film evaporator involved in the evaporation process also needs to be continuously adapted to the technical development.

The existing film evaporator mainly comprises a main shaft, a scraper device driven by the main shaft, a jacket, a cylinder, a seal head, a driving assembly and other parts. In the thin film evaporator, a scraper device is a key device, and materials are forcedly formed into a film on the wall of the evaporator cylinder through the scraper device in the separation process of the materials entering equipment, so that the working process of falling film evaporation under a vacuum condition is realized. Therefore, whether the structural form of the scraper device is adapted to the process requirements becomes a key factor for determining whether the equipment can normally and continuously operate. For the current highly refined industry, the film evaporator with one structure can not be simply used for being suitable for various working conditions, but the film evaporator needs to be classified and designed according to different industries and different material characteristics.

The prior scraper device mainly has the following problems: 1. the conventional movable scraper is thin and cannot bear high rotating speed and large load; 2. when the conventional fixed scraper is used for treating materials, the materials are easily blocked by scaling materials on the wall of the cylinder body due to the fixed clearance; 3. at present, the conventional scraper is made of non-metallic materials, the working temperature range is narrow, the rapid development of the chemical industry cannot be met, the chemical equipment is continuously accelerated to develop a new type and is more suitable for the process requirements, and particularly, the problem is easy to occur when the scraper is used for treating high-viscosity, solid and easily-scaling materials; 4. the center of the main shaft can not be communicated with a cold and hot medium, the material can not be cooled or heated, and the material is easy to scale on the outer surface of the main shaft.

Disclosure of Invention

The invention aims to provide a film evaporator adopting a rotary joint scraper device, which can solve the problems that a cold and hot medium cannot be introduced into the center of a main shaft, a material cannot be cooled or heated, and the material is easy to scale on the outer surface of the main shaft.

According to the technical scheme provided by the invention: a film evaporator adopting a rotary joint scraper device comprises an evaporator cylinder, wherein the top of the evaporator cylinder is hermetically connected with a rack, the bottom of the evaporator cylinder is hermetically connected with an end enclosure, a main shaft is rotatably installed in the evaporator cylinder, a motor is installed at the top of the rack, and a power output shaft of the motor is downwards connected with the upper end of the main shaft; the main shaft drives the metal scraper device to rotate through the rotor; the lower end of the main shaft is communicated with the rotary joint in a sealing way.

As a further improvement of the invention, the main shaft is rotatably arranged in the evaporator cylinder through a bearing piece.

As a further improvement of the invention, the main shaft is provided with a medium ring groove which is of a double-layer structure and comprises an outer-layer medium ring groove and an inner-layer medium ring groove which are annular, the outer-layer medium ring groove is positioned at the periphery of the inner-layer medium ring groove, and the outer-layer medium ring groove is communicated with the top of the inner-layer medium ring groove; the rotary joint is a double-channel rotary joint, comprises two medium channels which are respectively a first medium channel and a second medium channel, and the upper ends of the first medium channel and the second medium channel are respectively communicated with the bottom ends of the outer layer medium ring groove and the inner layer medium ring groove in a sealing mode.

As a further improvement of the invention, the rotor is sleeved and fixed on the main shaft, and the outer wall of the rotor is provided with a plurality of metal scraper devices which are arranged at equal intervals along the length direction of the rotor.

As a further improvement of the invention, the metal scraper device consists of a connecting plate and a metal scraper, wherein the connecting plate is welded and fixed on the periphery of the main shaft, two ends of the metal scraper are installed on the connecting plate, the outer side surface of the connecting plate is provided with an installation groove parallel to the axis of the rotor, and the end part of the metal scraper is rotatably installed in the installation groove.

As a further improvement of the invention, the end of the metal scraper can rotate 1-2 degrees in the mounting groove.

As a further improvement of the invention, the outer side edge of the metal scraper is attached to the inner wall of the evaporator cylinder.

As a further improvement of the invention, the connecting plate is clamped in the mounting groove.

The positive progress effect of this application lies in:

1. the invention has compact structure, and the evaporator of the scraper device is made of titanium material, thus improving the corrosion resistance; the rotor structure adopts arc draw-in groove hinge type, easy dismounting, and scraper blade and section of thick bamboo wall adopt the shovel wall form, can self-cleaning. The upper end and the lower end are sealed by a double-end-face mechanical sealing structure, and meanwhile, cooling and heating media are also introduced into the rotor rotating shaft, so that heat exchange is carried out inside and outside, and the heat exchange area is increased; in order to prevent the product from changing and realize the cooling and heating media inside the rotor rotating shaft, a novel rotary joint structure is designed.

2. The scraper is a metal scraper made of metal materials, the structural rigidity of the scraper is comprehensively enhanced, and the scraper can stably run like a fixed scraper evaporator at a high rotating speed; meanwhile, because the weight of the metal scraper is far larger than that of the conventional nonmetal scraper, the scraper can provide huge centrifugal force at high rotating speed to forcedly form a film on high-viscosity and solid materials, and has the same working capacity as that of the conventional fixed scraper. Meanwhile, the scrapers are designed in a staggered mode in a layered mode, and the film forming effect is improved.

Drawings

FIG. 1 is a front view of the structure of an embodiment of the present invention.

Fig. 2 is a front view of the squeegee assembly of fig. 1.

Fig. 3 is a top view of the squeegee assembly of fig. 1.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged under appropriate circumstances in order to facilitate the description of the embodiments of the invention herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover such processes, methods, systems, articles, or apparatus that comprise a list of steps or elements, are not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such processes, methods, articles, or apparatus.

In fig. 1-3, the evaporator comprises a frame 2, a main shaft 3, an evaporator cylinder 4, a head 5, a rotor 6, a rotary joint 11 and the like.

As shown in figure 1, the invention is a film evaporator adopting a rotary joint scraper device, which comprises an evaporator cylinder 4, wherein the top of the evaporator cylinder 4 is hermetically connected with a frame 2, the bottom of the evaporator cylinder 4 is hermetically connected with an end enclosure 5, a main shaft 3 is rotatably arranged in the evaporator cylinder 4 through a bearing piece, a motor 1 is arranged at the top of the frame 2, and a power output shaft of the motor 1 is downwards connected with the upper end of the main shaft 3; the main shaft 3 drives the metal scraper device to rotate through the rotor 6. The lower end of the main shaft 3 extends out of the seal head 5 and is communicated with the rotary joint 11 in a sealing way.

The main shaft 3 is provided with a medium ring groove, the medium ring groove is of a double-layer structure and comprises an outer layer medium ring groove and an inner layer medium ring groove, the outer layer medium ring groove and the inner layer medium ring groove are annular, the outer layer medium ring groove is located on the periphery of the inner layer medium ring groove, and the outer layer medium ring groove is communicated with the top of the inner layer medium ring groove.

The rotary joint 11 is a double-channel rotary joint, and comprises two medium channels, namely a first medium channel and a second medium channel, wherein the upper ends of the first medium channel and the second medium channel are respectively communicated with the bottom ends of the outer layer medium ring groove and the inner layer medium ring groove in a sealing manner.

As shown in fig. 1-3, in the present embodiment, the rotor 6 is fixed on the main shaft 3 in a sleeving manner, and a plurality of metal scraper devices are arranged on the outer wall of the rotor 6 at equal intervals along the length direction of the rotor 6.

In the embodiment, as shown in fig. 2 and fig. 3, each metal scraper device is composed of a connecting plate 7 and a metal scraper 8, the connecting plate 7 is welded and fixed on the periphery of the main shaft 3, the metal scraper 8 is clamped on the connecting plate 7, an installation groove 7-1 parallel to the axis of the rotor 6 is arranged on the outer side surface of the connecting plate 7, and the end part of the metal scraper 8 is rotatably installed in the installation groove 7-1. The end of the metal scraper 8 can rotate 1-2 degrees in the mounting groove 7-1.

In this embodiment, laminating between 8 outside limits of metal scraper and the 4 inner walls of evaporimeter barrel can effectively prevent the increase of material scaling thing on the 4 inner walls of evaporimeter barrel for scaling thing just can be scraped at the initial stage of formation, and carry out timely scraping to the scaling thing that exists. Meanwhile, the gap can be adjusted according to the physical properties and working conditions of the materials, and the metal scraper 8 is prevented from damaging the cylinder wall.

In the embodiment, as shown in fig. 2 and 3, the connection is mainly clamped by the mounting groove 7-1 of the connecting plate 7, so that the metal scraper 8 can be conveniently detached and replaced.

The specific application of the invention is as follows:

when the evaporator barrel 4 works, materials enter the evaporator barrel 4, the motor 1 drives the rotor 6 and the metal scraper device connected to the rotor 6 to rotate through the main shaft 3, and under the high-speed rotation, the scraper 8 in the metal scraper device is forced to form a film on the inner wall of the evaporator barrel 4, so that the working process is realized.

In the rotation process of the metal scraper device, if the metal scraper 8 encounters scaling substances and is difficult to scrape the scaling substances at one time, the metal scraper 8 can slightly move in the radial direction to avoid the scaling substances, and at a high rotation speed, the subsequent metal scraper 8 can form a continuous scraping effect on the scaling substances and has good adaptability to the consolidation materials on the wall of the evaporator cylinder 4. In addition, under high rotating speed, the action of large centrifugal force and the firm structure of the scraper 8 also have the capability of crushing materials, and agglomerated solid materials can be effectively crushed. Adopt rotary joint scraper means, the bottom connects rotary joint 11 simultaneously, and rotary joint 11 first medium passageway lets in hot water or vapor and gets into the outer medium annular of intercommunication, makes 3 surface temperature of main shaft rise, with 4 temperature adaptations of evaporimeter barrel, avoids 3 surface fouling scheduling problems of main shaft, and 3 surfaces of main shaft also can evaporate the material, increase equipment evaporation area. The hot water or the water vapor after the heat energy consumption flows into the inner layer medium ring groove from the top of the outer layer medium ring groove, and finally flows out of the rotary joint 11 from the second medium channel.

It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.

Claims

1. A film evaporator adopting a rotary joint scraper device is characterized by comprising an evaporator cylinder (4), wherein the top of the evaporator cylinder (4) is hermetically connected with a rack (2), the bottom of the evaporator cylinder (4) is hermetically connected with an end enclosure (5), a main shaft (3) is rotatably mounted in the evaporator cylinder (4), a motor (1) is mounted at the top of the rack (2), and a power output shaft of the motor (1) is downwards connected with the upper end of the main shaft (3); the main shaft (3) drives the metal scraper device to rotate through the rotor (6); the lower end of the main shaft (3) is communicated with the rotary joint (11) in a sealing way.

2. The thin film evaporator using the rotary joint scraper device as claimed in claim 1, wherein the main shaft (3) is rotatably installed in the evaporator cylinder (4) through a bearing member.

3. The film evaporator using the rotary joint scraper device according to claim 1, wherein the main shaft (3) is provided with a medium ring groove, the medium ring groove is of a double-layer structure and comprises an outer layer medium ring groove and an inner layer medium ring groove, the outer layer medium ring groove and the inner layer medium ring groove are annular, the outer layer medium ring groove is positioned on the periphery of the inner layer medium ring groove, and the outer layer medium ring groove is communicated with the top of the inner layer medium ring groove; the rotary joint (11) is a double-channel rotary joint, comprises two medium channels, namely a first medium channel and a second medium channel, and the upper ends of the first medium channel and the second medium channel are respectively communicated with the bottom ends of the outer layer medium ring groove and the inner layer medium ring groove in a sealing mode.

4. The film evaporator using the rotary joint scraper device according to claim 1, wherein the rotor (6) is fixed on the main shaft (3) in a sleeved manner, and a plurality of metal scraper devices are arranged on the outer wall of the rotor (6) at equal intervals along the length direction of the rotor (6).

5. The film evaporator using the rotary joint scraper device according to claim 4, wherein the metal scraper device is composed of a connecting plate (7) and a metal scraper (8), the connecting plate (7) is welded and fixed on the periphery of the main shaft (3), two ends of the metal scraper (8) are installed on the connecting plate (7), an installation groove (7-1) parallel to the axis of the rotor (6) is formed in the outer side surface of the connecting plate (7), and the end part of the metal scraper (8) is rotatably installed in the installation groove (7-1).

6. The thin film evaporator using the rotary joint scraper device according to claim 5, wherein the end of the metal scraper (8) can be rotated by 1-2 ° in the installation groove (7-1).

7. The film evaporator using the rotary joint scraper device according to claim 5, wherein the outer side edge of the metal scraper (8) is attached to the inner wall of the evaporator cylinder (4).

8. The thin film evaporator using the rotary joint scraper device as claimed in claim 1, wherein the connection plate (7) is snapped in the mounting groove (7-1).