Horizontal scraper evaporator

Abstract

The utility model relates to the technical field of scraper evaporators, in particular to a horizontal scraper evaporator which comprises a frame body, an evaporation barrel is arranged on the frame body, a motor is arranged at the lower end of the evaporation barrel, a stirring shaft is arranged in the evaporation barrel, the motor is in transmission connection with the left end of the stirring shaft through a chain, and a vacuum pump is arranged at the lower end of the evaporation barrel. A plurality of parallel supporting plates are arranged on the stirring shaft in the axial direction, and a plurality of fixed scraping plates and movable scraping plates which are fixedly connected with the supporting plates are arranged at the end parts of the supporting plates in a staggered manner in the left-right direction; the movable scraping plate is provided with a fixed frame fixedly connected with the supporting plate and located on one side of the hinge shaft, two parallel sliding rods are arranged on the fixed frame in a penetrating mode, a connecting plate is arranged on the sliding rods, the movable scraping plate is fixed to the connecting plate, and springs are arranged on the two sliding rods and located between the connecting plate and the fixed frame in a sleeving mode to push the connecting plate; the evaporation efficiency of the evaporator can be improved through the arrangement of the vacuum pump, the scraping plate can be attached to the inner wall of the evaporation barrel all the time through the arrangement of the movable scraping plate, and coking and scaling in the barrel are avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to scraper evaporator technical field, concretely relates to a horizontal scraper evaporator. BACKGROUND

[0002] The scraper evaporator is mainly composed of a heating jacket and a scraper. The jacket is connected with a heating steam, and the scraper is installed on a rotatable shaft with a small gap between the scraper and the inner wall of the heating jacket. The liquid enters the evaporator after preheating, and is distributed on the inner wall of the evaporator under the action of the rotating scraper to form a thin film, which is continuously evaporated and concentrated to obtain concentrated liquid or solid powder.

[0003] For example, the Chinese patent application with the application publication number CN105879419A discloses a double-section scraper evaporator, which comprises an evaporation cylinder and a motor. The motor is connected with the end of the rotating shaft in the evaporation cylinder through a belt pulley and a shaft coupling. The upper end of the evaporation cylinder is provided with a secondary steam outlet. A defoaming device, a distribution disc and an upper scraper assembly are sequentially arranged on the upper part of the rotating shaft below the secondary steam outlet to form an upper evaporation chamber. A lower scraper assembly is arranged on the lower part of the rotating shaft, and a balancer is connected to the bottom end of the rotating shaft to form a lower evaporation chamber. The evaporator has a simple structure, can effectively prevent coking and scaling, and improves the production efficiency.

[0004] However, the above-mentioned device still has some defects: 1. The above-mentioned evaporator only evaporates the solution by high-temperature steam during use, and most solutions have a high boiling point at normal temperature and pressure, which leads to low concentration and drying efficiency of the solution; 2. The scraper of the above-mentioned scraper evaporator will be worn out during long-term use. When the distance between the scraper and the cylinder wall is too large, the scraper needs to be replaced, and frequent replacement of the scraper increases the operating cost of the scraper evaporator. At the same time, the increase in the thickness of the solution film caused by the wear of the scraper also reduces the evaporation efficiency of the scraper evaporator; 3. The wear of the scraper also easily causes coking and scaling in the evaporator, which cannot be removed, thereby reducing the evaporation efficiency of the evaporator. UTILITY MODEL CONTENTS

[0005] The utility model provides a horizontal scraper evaporator to solve the technical problem that the existing evaporator leads to increased operating cost and reduced evaporation efficiency of the evaporator due to the wear of the scraper.

[0006] To solve the above-mentioned problems, the horizontal scraper evaporator provided by the utility model adopts the following technical scheme:

[0007] A horizontal scraper evaporator, which comprises a frame body, an evaporation cylinder arranged on the frame body, a motor arranged at the lower end of the evaporation cylinder, a stirring shaft arranged in the evaporation cylinder, the stirring shaft extending along the left-right direction, the motor being connected with the left end of the stirring shaft through chain transmission, and a vacuum pump arranged at the lower end of the evaporation cylinder to form a vacuum state in the evaporation cylinder.

[0008] A plurality of triangular support plates are arranged on the stirring shaft in the axial direction, each end of the support plates being staggered in the left-right direction and arranged with a plurality of fixed scrapers and movable scrapers fixedly connected with the support plates, the movable scraper being arranged with a fixed frame fixedly connected with the support plate at one side of the hinge shaft, two parallel slide rods being arranged in the radial direction of the stirring shaft and penetrating through the fixed frame, the two slide rods being arranged with a left-right extending connecting plate at one end of the cylinder wall of the evaporation cylinder, the movable scraper being fixed on the connecting plate, and springs being arranged on the two slide rods and located between the connecting plate and the fixed frame to push the connecting plate.

[0009] The vacuum pump can reduce the boiling point of the solution in the evaporation cylinder, so that the solution can be evaporated at a lower temperature, the evaporation time is shortened, and the evaporation efficiency of the evaporator is improved. The movable scraper can always adhere to the inner wall of the evaporation cylinder, so that the thickness of the solution film is not increased due to the wear of the scraper, and the cylinder wall is not coked and scaled, the evaporation efficiency of the evaporator is improved, and the maintenance cost of the scraper is reduced.

[0010] Further, a left-right extending fixed plate is arranged between the fixed scraper and the support plate, the fixed scraper being fixed on the fixed plate, and a reinforcing rib being further arranged between the support plate and the fixed plate.

[0011] The reinforcing rib improves the connection strength of the fixed plate and the support plate, and prolongs the service life of the fixed scraper.

[0012] Further, a left end cover is arranged at the left end of the evaporator, the left end cover being arranged with an inlet, an observation hole and a liquid level meter hole, a right end cover is arranged at the right end of the evaporation cylinder, and the right end cover is arranged with an outlet, an observation hole and a hand hole.

[0013] Further, a certain inclination is formed between the fixed scraper and the end face of the evaporation cylinder and between the movable scraper and the end face of the evaporation cylinder, so that the dried material powder moves to the outlet direction along with the rotation of the scraper.

[0014] Further, a jacket for passing hot steam is arranged on the outer circumferential surface of the drying cylinder, a steam inlet is arranged at the upper left end of the jacket, a steam outlet is arranged at the upper end of the jacket, and a condensate outlet is arranged at the lower right end of the jacket.

[0015] Further, a large sprocket is arranged at the left end of the stirring shaft, a small sprocket is arranged at the left end of the motor, a chain is arranged on the large sprocket and the small sprocket, and a tensioning device is arranged between the large sprocket and the small sprocket and located on the frame body.

[0016] Further, the left end of the evaporation cylinder is provided with a gas-liquid separator, the upper end of the evaporation cylinder is provided with a condenser communicated with the gas-liquid separator, the vacuum pump is communicated with the condenser, and the front side of the vacuum pump is provided with a collecting tank for collecting condensed liquid.

[0017] The horizontal scraped surface evaporator has the advantages that:

[0018] 1. The vacuum pump can reduce the boiling point of the solution in the evaporation cylinder, so that the solution can be evaporated at a lower temperature, the evaporation time is shortened, and the evaporation efficiency of the evaporator is improved; the movable scraper can always adhere to the inner wall of the evaporation cylinder, so that the increase of the thickness of the solution film and the coking and fouling of the cylinder wall caused by the wear of the scraper are avoided, the evaporation efficiency of the evaporator is improved, and the maintenance cost of the scraper is reduced.

[0019] 2. The reinforcing ribs improve the connection strength of the fixed plate and the support plate, and prolong the service life of the fixed scraper.

[0020] 3. The inclination angle makes the material in the evaporation cylinder move to the right side of the evaporation cylinder along with the rotation of the fixed scraper and the movable scraper, improves the automation degree of the device and the convenience of discharging. BRIEF DESCRIPTION OF DRAWINGS

[0021] The above and other objects, features and advantages of the exemplary embodiments of the present application will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which:

[0022] Figure 1 It is a front view of the horizontal scraped surface evaporator provided by the present application;

[0023] Figure 2 It is a side view of the horizontal scraped surface evaporator provided by the present application;

[0024] Figure 3 It is a structure schematic view of the left end cover;

[0025] Figure 4 It is a structure schematic view of the right end cover;

[0026] Figure 5 It is a structure schematic view of the scraper assembly;

[0027] Figure 6 It is a side view of the scraper assembly;

[0028] Figure 7 It is a structure schematic view of the movable scraper.

[0029] Reference signs:

[0030] 1, frame; 2, evaporation cylinder; 21, jacket; 22, steam inlet; 23, steam outlet; 24, condensate outlet; 25, left end cover; 251, feed inlet; 252, liquid level gauge port; 253, observation port; 26, right end cover; 261, hand hole; 262, discharge port;

[0031] 3, stirring shaft; 4, scraper assembly; 41, support plate; 42, fixed plate; 43, fixed scraper; 44, fixed frame; 441, reinforcing rib; 45, sliding rod; 451, limiting sleeve; 452, set screw; 46, connecting plate; 47, movable scraper; 48, spring;

[0032] 5, drive assembly; 51, large sprocket; 52, small sprocket; 53, chain; 54, motor;

[0033] 6, collection assembly; 61, vacuum pump; 62, cooler; 63, collection tank; 64, output pump; 7, gas-liquid separator; 8, condenser. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. It should be known by those skilled in the art that the embodiments described below are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0035] The main concept of the present application is that the boiling point of the solution in the evaporation cylinder 2 can be reduced by setting the vacuum pump 61, so that the solution evaporates at a lower temperature, the evaporation time is shortened, and the evaporation efficiency of the evaporator is improved. The setting of the movable scraper 47 makes the scraper always adhere to the inner wall of the evaporation cylinder 2, avoids the increase of the thickness of the solution film and the coking and fouling of the cylinder wall caused by the wear of the scraper, improves the evaporation efficiency of the evaporator, and reduces the maintenance cost of the scraper.

[0036] After introducing the basic principle of the present application, the various non-limiting embodiments of the present application will be specifically introduced below. Any element quantity in the drawings is used for example and is not limited, and any naming is only used for distinction and does not have any limiting meaning.

[0037] The principles and spirits of the present application will be explained in detail below with reference to several representative embodiments of the present application.

[0038] Embodiment 1 of the horizontal scraper evaporator provided by the present application:

[0039] As Figures 1 to 7 shown, the device comprises a rectangular frame body 1, the upper end of the frame body 1 is provided with an evaporation cylinder 2, the evaporation cylinder 2 is defined to extend along the left-right direction, the evaporation cylinder 2 is provided with a stirring shaft 3, the stirring shaft 3 is provided with a scraper assembly 4 for stirring the solution, the left end of the evaporation cylinder 2 is provided with a driving assembly 5 for driving the stirring shaft 3, the left upper end of the evaporation cylinder 2 is further provided with a gas-liquid separator 7, the upper end of the evaporation cylinder 2 is provided with a condenser 8 in communication with the gas-liquid separator 7, and the lower end of the evaporation cylinder 2 is provided with a collection assembly 6 in communication with the condenser 8.

[0040] Firstly, the evaporation cylinder 2 is introduced below, the evaporation cylinder 2 is a cylindrical cylinder, a circumferential extending jacket 21 is arranged on the outer circumferential surface of the evaporation cylinder 2, the jacket 21 is used for passing in high temperature water vapor to heat the evaporation cylinder 2, the left upper end of the jacket 21 is provided with a steam inlet 22, the right upper end of the jacket 21 is provided with a steam outlet 23, and the right lower end of the jacket 21 is provided with a condensate outlet 24 to discharge condensed water.

[0041] In addition, the left end of the evaporation cylinder 2 is provided with a left end cover 25, the left end cover 25 is provided with a feed inlet 251 for inputting the solution to be evaporated into the evaporation cylinder 2, a liquid level meter port 252 is arranged on the left side of the feed inlet 251, the right end of the evaporation cylinder 2 is provided with a right end cover 26, the right end cover 26 is provided with a discharge port 262, and the right end cover 26 is further provided with a hand hole 261 for checking and maintaining the structure and components inside the evaporator; the left end cover 25 and the right end cover 26 are both provided with an observation port 253 to observe the internal condition of the evaporation cylinder 2.

[0042] The scraper assembly 4 is introduced below, the scraper assembly 4 comprises a plurality of equilateral triangle support plates 41 arranged in parallel along the axial direction of the stirring shaft 3, the center of each support plate 41 coincides with the axis of the stirring shaft 3, and the corner ends of each support plate 41 are linearly arranged; a plurality of fixed scrapers 43 and movable scrapers 47 are arranged alternately on the left and right corner ends of each support plate 41, a fixed plate 42 extending left and right is arranged between each fixed scraper 43 and the support plate 41, the fixed scraper 43 is fixed on the fixed plate 42, and a reinforcing rib 441 is further arranged between the support plate 41 and the fixed plate 42 to improve the connection strength of the fixed plate 42 and the support plate 41 and prolong the service life of the fixed scraper 43.

[0043] In addition, the movable scraper 47 is provided with a rectangular fixed frame 44 fixedly connected with the support plate 41 on one side of the hinge shaft, two parallel slide rods 45 are provided in the fixed frame 44 along the radial direction of the stirring shaft 3, the two slide rods 45 are provided with left and right extending connecting plates 46 on one end of the cylinder wall of the evaporation cylinder 2, the movable scraper 47 is fixed on the connecting plates 46, springs 48 are sleeved on the two slide rods 45 and between the connecting plates 46 and the fixed frame 44, so that the movable scraper 47 is attached to the cylinder wall of the evaporation cylinder 2, and limiting sleeves 451 are sleeved on the slide rods 45, and the limiting sleeves 451 are provided with set screws 452 on one side, so as to fix the slide rods 45 during installation. In addition, the fixed scraper 43 and the end surface of the evaporation cylinder 2, and the movable scraper 47 and the end surface of the evaporation cylinder 2 have a certain inclination angle, so that the dried material powder moves to the discharge port 262 direction with the rotation of the scraper.

[0044] The driving assembly 5 is introduced below, which includes a motor 54 located at the lower end of the evaporation cylinder 2, the motor 54 is fixed on the left side of the frame body 1, the left end of the motor 54 is an output end, the left end of the motor 54 is provided with a small sprocket 52, the left end of the motor 54 is provided with a large sprocket 51, the small sprocket 52 and the large sprocket 51 are sleeved with a chain 53, so that the motor 54 drives the stirring shaft 3 to rotate through chain transmission; the small sprocket 52 and the large sprocket 51 are also provided with a tensioning device to ensure the stability of the chain transmission.

[0045] Then introduce the collection assembly 6, the collection assembly 6 includes a vacuum pump 61 located at the lower end of the evaporation cylinder 2, the vacuum pump 61 is fixed on the bottom of the frame body 1, the front side of the vacuum pump 61 is provided with a collection tank 63 for collecting condensate, the vacuum pump 61 is a water ring vacuum pump, the vacuum pump 61 and the condenser 8 are communicated to increase the vacuum degree in the evaporation cylinder 2, so as to improve the evaporation efficiency of the evaporator by reducing the boiling point of the solution; the bottom of the frame body 1 is also provided with a cooler 62 for protecting the vacuum pump 61, the left side of the collection tank 63 is provided with an output pump 64 to transport the liquid in the collection tank 63 to the outside.

[0046] The working principle of the device is as follows: first, start the vacuum pump 61, so that the evaporation cylinder 2, the gas-liquid separator 7, the condenser 8 and the corresponding pipeline form a vacuum state, then the solution to be evaporated is input into the evaporation cylinder 2 through the feed inlet 251, after the input of the solution to be evaporated is completed, high temperature water vapor is input through the steam inlet 22, and the evaporation cylinder 2 is heated in the jacket 21; under the condition of vacuum, the boiling point of the solution to be evaporated is reduced, the evaporation speed of the solution is accelerated, the vapor evaporated from the solution enters the condenser 8 through the gas-liquid separator 7, and then is collected in the collection tank 63 under the action of the vacuum pump 61, and is transported to the outside through the output pump 64.

[0047] During the evaporation of the solution in the evaporation cylinder 2, the fixed scraper 43 and the movable scraper 47 in the evaporator are reversed to ensure that the material liquid is evenly heated and to prevent the formation of coking on the cavity wall. As the moisture in the solution decreases, powdery crystals are gradually formed in the evaporation cylinder 2, and then the heating is stopped. Under the action of the scraper assembly 4, the powdery crystals are gradually discharged from the discharge port 262, and the evaporation and drying of the solution to be evaporated is completed.

[0048] Embodiment 2 of the horizontal scraper evaporator provided by the utility model:

[0049] The difference between the embodiment 2 and the embodiment 1 mainly lies in that:

[0050] In the embodiment 1, the evaporation cylinder is heated by water vapor.

[0051] In the embodiment, the evaporation cylinder is heated by heat conducting oil or hot water.

[0052] Embodiment 3 of the horizontal scraper evaporator provided by the utility model:

[0053] The difference between the embodiment 3 and the embodiment 1 mainly lies in that:

[0054] In the embodiment 1, a water ring vacuum pump is used as the vacuumizing equipment of the evaporation cylinder.

[0055] In the embodiment, a Roots vacuum pump or a rotary vacuum pump or other vacuum pumps are used as the vacuumizing equipment of the evaporation cylinder.

[0056] According to the above description of the present specification, those skilled in the art can also understand that the terms used, such as "upper", "lower", "front", "rear", "left", "right", "width", "horizontal", "top", "bottom", "inner", "outer" and the like indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings of the present specification, and are only for the purpose of facilitating the description of the scheme of the present utility model and simplifying the description, and do not explicitly or implicitly indicate or suggest that the devices or elements involved must have the specific orientation, be constructed and operated in the specific orientation, therefore the above orientation or positional relationship terms cannot be understood or interpreted as a limitation on the scheme of the present utility model.

[0057] In addition, in the description of the present specification, "a plurality of" means at least two, such as two, three or more, etc., unless otherwise explicitly and specifically limited.

Claims

1. A horizontal scraped surface evaporator comprising a frame, a evaporation cylinder arranged on the frame, a motor arranged at the lower end of the evaporation cylinder, and a stirring shaft arranged in the evaporation cylinder, wherein the stirring shaft extends in the left-right direction, and the motor is connected to the left end of the stirring shaft through a chain transmission, characterized in that: a vacuum pump is arranged at the lower end of the evaporation cylinder to form a vacuum state in the evaporation cylinder; a plurality of triangular support plates are arranged on the stirring shaft in the axial direction, and a plurality of fixed and movable scraping plates are arranged on each end of the support plates in the left-right direction; a fixed frame is arranged on the side of the hinged shaft of the movable scraping plate and fixedly connected to the support plate, two parallel slide rods are arranged on the fixed frame in the radial direction of the stirring shaft, and a left-right extending connecting plate is arranged on one end of the slide rods; the movable scraping plate is fixed on the connecting plate, and springs are arranged on the two slide rods between the connecting plate and the fixed frame to push the connecting plate. A fixed plate extending in the left-right direction is arranged between the fixed scraping plate and the support plate, the fixed scraping plate is fixed on the fixed plate, and a reinforcing rib is arranged between the support plate and the fixed plate. A left end cover is arranged at the left end of the evaporator, and a feeding port, an observation port, and a liquid level meter port are arranged on the left end cover; a right end cover is arranged at the right end of the evaporation cylinder, and a discharging port, an observation port, and a hand hole are arranged on the right end cover.

2. A horizontal scraped surface evaporator according to claim 1, characterized in that A certain inclination is formed between the fixed scraping plate and the end surface of the evaporation cylinder, and between the movable scraping plate and the end surface of the evaporation cylinder, so that the dried material powder moves to the discharging port along with the rotation of the scraping plate.

3. A horizontal scraped surface evaporator according to claim 2, wherein, A jacket for introducing hot steam is arranged on the outer circumferential surface of the evaporation cylinder, a steam inlet is arranged at the upper left end of the jacket, a steam outlet is arranged at the upper right end of the jacket, and a condensate outlet is arranged at the lower right end of the jacket.

4. A horizontal scraped surface evaporator according to claim 3, wherein A large sprocket is arranged at the left end of the stirring shaft, a small sprocket is arranged at the left end of the motor, a chain is arranged on the large sprocket and the small sprocket, and a tensioning device is arranged between the large sprocket and the small sprocket and on the frame.

5. A horizontal scraped surface evaporator according to claim 4, wherein A gas-liquid separator is arranged at the left end of the evaporation cylinder, a condenser is arranged at the upper end of the evaporation cylinder and communicates with the gas-liquid separator, the vacuum pump communicates with the condenser, and a collection tank for collecting condensate is arranged on the front side of the vacuum pump.

6. A horizontal scraped surface evaporator according to claim 5, wherein ​ 7. A horizontal scraped surface evaporator according to claim 6, wherein ​

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