Evaporative crystallization device for citric acid production

Abstract

The utility model relates to the technical field of citric acid production evaporative crystallization devices, in particular to a citric acid production evaporative crystallization device which comprises a crystallization device body, a rotating shaft is rotatably arranged in the crystallization device body, the top of the rotating shaft is in transmission connection with a driving assembly, and spiral blades are evenly arranged on the rotating shaft. A first scraping plate is fixedly connected to the bottom end of the rotating shaft, second scraping plates are fixedly connected to the two ends of the first scraping plate respectively, the two second scraping plates and the rotating shaft are connected together through corresponding connecting rods respectively, and a plurality of stirring blades are arranged on the side walls, close to each other, of the two second scraping plates. A plurality of liquid drainage holes are formed in the stirring blades in a penetrating mode, each stirring blade is folded in the reverse direction of the liquid facing face of the stirring blade to form an auxiliary blade, and material holes for materials to pass through are formed in the auxiliary blades in a penetrating mode; according to the utility model, not only can materials in the crystallization device be mixed in multiple directions, but also the inner wall of the crystallization device can be automatically and thoroughly cleaned.

Description

Technical Field

[0001] The utility model relates to the technical field of citric acid production evaporation crystallization devices, in particular to a citric acid production evaporation crystallization device. Background Art

[0002] Citric acid (CA), also known as citric acid, is an important organic acid. It is a colorless crystal, odorless, has a strong sour taste, and is easily soluble in water. It is an acidity regulator (GB2760-2014) and a food additive. In the production process, citric acid often needs to be crystallized into crystals. Therefore, there are many equipment used to evaporate citric acid to make it crystallized.

[0003] Most of the existing crystallization devices simply use a motor to drive a stirring column for stirring, and the stirring area is limited. Since the material is too viscous and the resistance is large during the crystallization process, such a setting can only stir the material in the crystallization device in one direction. Since the material in the crystallization device is relatively viscous, the material will rotate during stirring or the material cannot be flipped up and down, resulting in uneven material mixing, which will greatly affect the crystallization effect.

[0004] In addition, during the use of the evaporation crystallization device, the crystallized material easily adheres to its inner wall. After long-term use, when the inner wall of the evaporation crystallization device needs to be cleaned, it is generally cleaned manually with a handheld brush, which is not only time-consuming and labor-intensive, but also causes the inner wall of the evaporation crystallization device to be incompletely cleaned, making it inconvenient to use. Utility Model Content

[0005] The main technical problem to be solved by the utility model is to provide a citric acid production evaporation crystallization device which has a simple structure and is easy to operate, and can not only mix the materials in the crystallization device in multiple directions, but also automatically and thoroughly clean the inner wall of the crystallization device.

[0006] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0007] A citric acid production evaporation crystallization device comprises a crystallization device body, a rotating shaft is rotatably arranged in the crystallization device body, a driving assembly is transmission-connected to the top of the rotating shaft, spiral blades are evenly arranged on the rotating shaft, a first scraping plate for scraping the bottom inner wall of the crystallization device body is fixedly connected to the bottom end of the rotating shaft, second scraping plates are fixedly connected to the two ends of the first scraping plate, the two second scraping plates are in contact with the inner wall of the crystallization device body on the sides away from each other, the two second scraping plates are connected to the rotating shaft through corresponding connecting rods, a plurality of stirring blades are arranged on the side walls of the two second scraping plates close to each other, a plurality of drainage holes are penetrated on the stirring blades, each stirring blade is folded in the opposite direction of its liquid facing surface to form an auxiliary blade, and a material hole for material to pass through is penetrated on the auxiliary blade.

[0008] The following is a further optimization of the above technical solution by the utility model:

[0009] The width of the stirring blade near the second scraping plate is wider than that at the end, and the number of drainage holes near the second scraping plate is greater than that at the end.

[0010] Further optimization: there are two auxiliary blades, and the two auxiliary blades are symmetrically distributed about the center line of the stirring blade.

[0011] Further optimization: all the stirring blades on one of the second scraping plates are arranged to be tilted downward, and all the stirring blades on the other second scraping plate are arranged to be tilted upward.

[0012] Further optimization: the stirring blades on the two second scraping plates are arranged alternately.

[0013] Further optimization: the driving assembly includes a motor box fixedly mounted on the top of the crystallization device body, a driving motor is fixedly mounted on the top inner wall of the motor box, and a power output end of the driving motor is transmission-connected to the rotating shaft.

[0014] Further optimization: Ventilation holes are provided on the outer side walls around the motor box, and protective nets are provided on the ventilating holes.

[0015] Further optimization: the bottom inner wall of the crystallization device body is arranged in an arc-shaped groove, the lowest end of the bottom of the crystallization device body is fixedly connected with a discharge pipe, and the discharge pipe is provided with a valve for controlling the on and off of the discharge port.

[0016] The utility model drives the rotating shaft to rotate through the driving component, and the spiral blades on the rotating shaft rotate accordingly. The spiral blades, on the one hand, push the material to flow upward or downward in the crystallization device body to promote the mixing and circulation of the material; on the other hand, they assist the evaporation crystallization process.

[0017] At the same time, when the shaft rotates, the first scraper plate is driven to continuously scrape the bottom inner wall of the crystallization device body to prevent crystals and other substances from accumulating at the bottom, and the two symmetrical second scraper plates connected to the first scraper plate also rotate accordingly. Since they are in contact with the inner wall of the crystallization device body, they can completely scrape off the substances attached to the inner wall.

[0018] At the same time, the stirring blades on the two second scraper plates stir the material during rotation, further improving the mixing effect. The drainage holes on the stirring blades are conducive to the discharge and exchange of the liquid. The auxiliary blades folded back against the liquid surface of the stirring blades and the material holes on them can better handle the material during the stirring process, making the flow and reaction of the material more sufficient and uniform, which is conducive to the efficient evaporation and crystallization, and improving the quality and efficiency of crystallization.

[0019] By adopting the above technical solution, the utility model has a simple structure and is easy to operate. It can not only mix the materials in the crystallization device in multiple directions, but also automatically and thoroughly clean the inner wall of the crystallization device.

[0020] The utility model is further described below in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the stirring blade in the embodiment of the utility model;

[0023] Figure 3 for Figure 2 Cross-section view in the AA direction.

[0024] In the figure: 1-crystallization device body; 2-rotating shaft; 3-driving assembly; 31-motor box; 32-driving motor; 33-ventilation port; 34-protective net; 4-spiral blade; 5-first scraper plate; 6-second scraper plate; 7-connecting rod; 8-stirring blade; 9-drainage hole; 10-auxiliary blade; 11-material hole; 12-feed pipe; 13-sealing cover; 14-support leg; 15-discharge pipe; 16-valve. DETAILED DESCRIPTION

[0025] like Figure 1-3 As shown, a citric acid production evaporation crystallization device comprises a crystallization device body 1, a rotating shaft 2 is rotatably arranged in the crystallization device body 1, a driving assembly 3 is transmission-connected to the top of the rotating shaft 2, spiral blades 4 are evenly arranged on the rotating shaft 2, a first scraping plate 5 for scraping the bottom inner wall of the crystallization device body 1 is fixedly connected to the bottom end of the rotating shaft 2, second scraping plates 6 are fixedly connected to the two ends of the first scraping plate 5, and the two second scraping plates 6 are in contact with the inner wall of the crystallization device body 1 on the sides away from each other, and the two second scraping plates 6 are connected to the rotating shaft 2 through corresponding connecting rods 7, and a plurality of stirring blades 8 are arranged on the side walls of the two second scraping plates 6 close to each other, and a plurality of drainage holes 9 are penetrated on the stirring blades 8, and each stirring blade 8 is folded in the opposite direction of its liquid surface to form an auxiliary blade 10, and the auxiliary blade 10 is penetrated with a material hole 11 for material to pass through.

[0026] With this design, the driving assembly 3 drives the shaft 2 to rotate, and the spiral blades 4 on the shaft 2 rotate accordingly. On the one hand, the spiral blades 4 push the material to flow upward or downward in the crystallization device body 1 to promote the mixing and circulation of the material; on the other hand, they assist the evaporation crystallization process.

[0027] At the same time, when the rotating shaft 2 rotates, the first scraper plate 5 is driven to continuously scrape the bottom inner wall of the crystallization device body 1 to prevent crystals and other substances from accumulating at the bottom, and the two symmetrical second scraper plates 6 connected to the first scraper plate 5 also rotate accordingly. Since they are in contact with the inner wall of the crystallization device body 1, they can completely scrape off the substances attached to the inner wall.

[0028] At the same time, the stirring blades 8 on the two second scraping plates 6 stir the material during the rotation process, further improving the mixing effect. The drainage holes 9 on the stirring blades 8 are conducive to the discharge and exchange of the liquid. The auxiliary blades 10 folded back from the stirring blades 8 to face the liquid surface and the material holes 11 thereon better handle the material during the stirring process, making the flow and reaction of the material more sufficient and uniform, which is conducive to the efficient evaporation and crystallization, and improving the quality and efficiency of the crystallization.

[0029] The width of the stirring blade 8 near the second scraping plate 6 is wider than that at the end, and the number of the drainage holes 9 near the second scraping plate 6 is greater than that at the end.

[0030] First, the stirring blade 8 is wider near the second scraper plate 6, which increases the contact area between this part and the material, and can push and stir the material more forcefully, especially in the area near the scraper plate, which strengthens the effect on the material and is conducive to the uniform mixing and flow of the material. The wider design also makes this part have a greater stirring torque when rotating, improving the stirring efficiency.

[0031] Secondly, there are a large number of drainage holes 9 near the second scraper plate 6, which makes the liquid in this area more fluid. During the stirring process, more drainage holes 9 can speed up the exchange and discharge of the liquid, avoid local liquid accumulation, and promote the smooth progress of the evaporation and crystallization process; at the same time, in conjunction with the wider blade structure, it can better realize the processing and adjustment of the material, so that the material can obtain suitable stirring and fluid dynamic conditions at different positions; and the number of drainage holes 9 at the end is small, which can maintain a certain stirring force and stability to a certain extent, making the function of the entire stirring blade 8 more coordinated and reasonable, thereby improving the optimization and protection of the evaporation and crystallization process of citric acid production by the device as a whole.

[0032] There are two auxiliary blades 10 , and the two auxiliary blades 10 are symmetrically distributed about the center line of the stirring blade 8 .

[0033] With this design, firstly, the symmetrical distribution of the two auxiliary blades 10 can make the stirring more uniform and balanced. When the stirring blade 8 rotates, the symmetrical auxiliary blades 10 can act on the material from both sides at the same time, further enhancing the stirring effect, so that the material can be fully stirred and mixed in all directions, which is beneficial to the uniform processing and reaction of the material.

[0034] Secondly, this symmetrical structure helps to maintain mechanical stability during the stirring process, reduce additional vibration or shaking caused by imbalance, and make the device run more smoothly and reliably; at the same time, the symmetrical design also makes the effect of the auxiliary blade 10 on the material more regular and predictable, which facilitates better control and optimization of the evaporation and crystallization process and improves overall work efficiency and quality.

[0035] All the stirring blades 8 on one of the second scraping plates 6 are arranged to be tilted downward, and all the stirring blades 8 on the other second scraping plate 6 are arranged to be tilted upward.

[0036] With this design, firstly, the stirring blades 8 on one second scraper plate 6 are tilted downward, and the stirring blades 8 on the other second scraper plate 6 are tilted upward, so that they can form flow forces in different directions when rotating and stirring, thereby stirring and mixing the materials more comprehensively, enhancing the stirring effect, and promoting the uniform distribution of the materials and the progress of the reaction; secondly, the tilting settings in different directions can better drive the materials to circulate in the crystallization device body 1, avoid local accumulation or stagnation of the materials, help to improve the crystallization efficiency and quality, and also reduce the formation of dead corners, making the crystallization process more efficient and complete.

[0037] The stirring blades 8 on the two second scraping plates 6 are arranged alternately.

[0038] First, the staggered stirring blades 8 can further improve the sufficiency and uniformity of stirring. They can act on the material from different positions and angles, reduce the blind spots of stirring, and enable the material to be more comprehensively stirred and mixed in the entire device; secondly, this staggered setting can increase the complexity and diversity of stirring, better break the laminar state of the material, promote material exchange and reaction, and help improve the effect and rate of crystallization; thirdly, staggering is also conducive to enhancing the overall material processing capacity of the scraper plate, making the synergistic effect of scraping and stirring more efficient, more effectively preventing the accumulation and adhesion of materials such as crystals, and keeping the inside of the device clean and in good working condition.

[0039] The driving assembly 3 includes a motor box 31 fixedly mounted on the top of the crystallization device body 1 , a driving motor 32 is fixedly mounted on the top inner wall of the motor box 31 , and a power output end of the driving motor 32 is drivingly connected to the rotating shaft 2 .

[0040] Ventilation holes 33 are formed on the outer walls of the motor box 31 , and protection nets 34 are disposed on the ventilating holes 33 .

[0041] Such a design, firstly, the opening of the vent 33 is not only conducive to the rapid dissipation of heat in the motor box 31, preventing the motor from being damaged or affecting its performance and life due to overheating, ensuring that the motor can operate stably for a long time; and good air circulation can reduce moisture accumulation and reduce the risk of motor failure due to moisture.

[0042] Secondly, the protection net 34 can not only block dust and debris from the outside from entering the motor box 31, thus preventing these foreign objects from damaging the motor or interfering with its normal operation; it can also prevent people from accidentally touching the running parts of the motor and causing injuries, thereby improving the safety of the device.

[0043] A feed pipe 12 is fixedly connected to the top of the crystallization device body 1 , and a sealing cover 13 is threadedly connected to the feed port of the feed pipe 12 .

[0044] With this design, the threaded connection of the sealing cover 13 ensures good sealing performance, prevents leakage and reduces the entry of impurities, and maintains the integrity, stability and cleanliness of the system; at the same time, this design is easy to maintain and replace the sealing cover 13, is easy to operate, is conducive to adapting to different production needs, ensures the smooth progress of the crystallization process and improves product quality.

[0045] Four supporting legs 14 are evenly and fixedly connected to the lower side of the outer side wall of the crystallization device body 1, and the four supporting legs 14 are symmetrically arranged in pairs.

[0046] With this design, firstly, the four evenly distributed supporting legs 14 can provide stable support for the crystallization device body 1, ensuring that the device is placed stably and will not shake or tilt easily, which is conducive to the safe and stable progress of the production process; secondly, the symmetrical arrangement of the two can make the support more balanced and the force more reasonable, further enhancing the stability of the device and reducing the risk of deformation or damage caused by uneven force; thirdly, this layout makes the entire device have better balance and stability during installation and use, can adapt to different working environments and conditions, and provide reliable guarantee for the normal operation of the device.

[0047] The inner wall of the bottom of the crystallization device body 1 is provided with an arc-shaped groove, and the lowest end of the bottom of the crystallization device body 1 is fixedly connected with a discharge pipe 15, and the discharge pipe 15 is provided with a valve 16 for controlling the opening and closing of the discharge port.

[0048] With this design, firstly, the arc-shaped groove on the inner wall of the bottom is conducive to the gathering and flow of materials. The arc shape can reduce the accumulation and retention of materials at the bottom, allowing the materials to flow more smoothly to the discharge pipe 15 at the lowest end, thereby improving the efficiency of material discharge, minimizing material residue and saving resources.

[0049] Secondly, the fixedly connected discharge pipe 15 is located at the lowest end of the bottom, which can ensure that the material in the crystallization device is discharged as completely as possible, avoiding the accumulation of material in the device and affecting the subsequent production process and product quality.

[0050] Thirdly, the valve 16 provided on the discharge pipe 15 can accurately control the on-off of the discharge. In the production process, the time of discharge and the speed of discharge can be flexibly determined according to actual needs.

[0051] For ordinary technicians in this field, according to the teachings of the present invention, without departing from the principles and spirit of the present invention, changes, modifications, substitutions and variations made to the implementation methods are still within the protection scope of the present invention.

Claims

1. A citric acid production evaporation crystallization device, comprising a crystallization device body (1), a rotating shaft (2) rotatably arranged inside the crystallization device body (1), a driving assembly (3) being transmission-connected to the top of the rotating shaft (2), characterized in that: The rotating shaft (2) is evenly provided with spiral blades (4). The bottom end of the rotating shaft (2) is fixedly connected with a first scraping plate (5) for scraping the inner wall of the bottom of the crystallization device body (1). The two ends of the first scraping plate (5) are respectively fixedly connected with second scraping plates (6). The two sides of the two second scraping plates (6) away from each other are in contact with the inner wall of the crystallization device body (1). The two second scraping plates (6) and the rotating shaft (2) are respectively connected together through corresponding connecting rods (7). The side walls of the two second scraping plates (6) close to each other are provided with a plurality of stirring blades (8). The stirring blades (8) are penetrated with a plurality of drainage holes (9). Each stirring blade (8) is folded out in the opposite direction of the liquid surface to form an auxiliary blade (10). The auxiliary blade (10) is penetrated with a material hole (11) for passing the material.

2. A citric acid production evaporation crystallization device according to claim 1, characterized in that: The width of the stirring blade (8) near the second scraping plate (6) is wider than the width at the end, and the number of the drainage holes (9) near the second scraping plate (6) is greater than the number of the drainage holes (9) at the end.

3. A citric acid production evaporation crystallization device according to claim 2, characterized in that: There are two auxiliary blades (10), and the two auxiliary blades (10) are symmetrically distributed about the center line of the stirring blade (8).

4. A citric acid production evaporation crystallization device according to claim 3, characterized in that: All the stirring blades (8) on one of the second scraping plates (6) are arranged to tilt downward, and all the stirring blades (8) on the other second scraping plate (6) are arranged to tilt upward.

5. A citric acid production evaporation crystallization device according to claim 4, characterized in that: The stirring blades (8) on the two second scraping plates (6) are arranged in an interlaced manner.

6. A citric acid production evaporation crystallization device according to claim 5, characterized in that: The driving assembly (3) comprises a motor box (31) fixedly mounted on the top of the crystallization device body (1), a driving motor (32) fixedly mounted on the top inner wall of the motor box (31), and a power output end of the driving motor (32) is drivingly connected to the rotating shaft (2).

7. A citric acid production evaporation crystallization device according to claim 6, characterized in that: Ventilation holes (33) are provided on the outer walls of the motor box (31) on all four sides, and protective nets (34) are provided on the ventilating holes (33).

8. A citric acid production evaporation crystallization device according to claim 1, characterized in that: The inner wall of the bottom of the crystallization device body (1) is provided with an arc-shaped groove, and the lowest end of the bottom of the crystallization device body (1) is fixedly connected to a discharge pipe (15), and a valve (16) for controlling the opening and closing of the discharge port is provided on the discharge pipe (15).

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