Cooling crystallization device for disodium hydrogen phosphate production

Abstract

The utility model relates to a cooling crystallization device for producing disodium hydrogen phosphate, which is characterized in that stirring blades (13) are of arc-shaped structures, water storage cavities (14) are formed in the stirring blades (13), a water inlet channel (15) and a water outlet channel (16) are arranged in a rotating shaft (12), the water inlet channel (15) is communicated with the water storage cavity (14) of one stirring blade (13), the water outlet channel (16) is communicated with the water storage cavity (14) of the other stirring blade (13), and the water outlet channel (16) is communicated with the water storage cavity (14) of the other stirring blade (13). The water storage cavities (14) of the two stirring blades (13) are communicated with each other; the rotating shaft (12) drives the two stirring blades (13) to rotate so as to stir a disodium hydrogen phosphate solution in the container (10), meanwhile, water flowing in the water storage cavities (14) of the stirring blades (13) is used for uniformly cooling the disodium hydrogen phosphate solution, the solution cooling is accelerated, the cooling crystallization efficiency is improved, and meanwhile, the stirring blades (13) of an arc-shaped structure rotate at a low speed so as to reduce bubbles generated by the solution and improve the crystallization efficiency. The influence on crystallization is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of disodium hydrogen phosphate production, in particular to a cooling and crystallization device for disodium hydrogen phosphate production. Background Technique

[0002] Disodium hydrogen phosphate, with the chemical formula Na2HPO4, is one of the sodium acid salts generated by phosphoric acid. Disodium hydrogen phosphate is a white granular or powdery solid, easy to deliquesce, and easy to effloresce in the air. Disodium hydrogen phosphate has a wide range of applications in multiple fields. In the industrial field, it is used as a water softener, fabric weighting agent, fire retardant, as well as glaze, welding flux, industrial water quality treatment agent, printing and dyeing detergent, etc.; in the pharmaceutical field, it is used as an antibiotic culture medium, biochemical treatment agent, etc.; in the food industry, it is used as a food quality improver; it is also used in pigments, preparation of other phosphates, etc. During the preparation of disodium hydrogen phosphate, generally, more water in the disodium hydrogen phosphate solution is first evaporated, and then disodium hydrogen phosphate is crystallized by cooling. The existing preparation of disodium hydrogen phosphate generally adopts natural static cooling crystallization, with uneven cooling and low cooling crystallization efficiency. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is that the existing preparation of disodium hydrogen phosphate generally adopts natural static cooling crystallization, with uneven cooling and low cooling crystallization efficiency.

[0004] To solve the above problems, the utility model provides a cooling and crystallization device for disodium hydrogen phosphate production. A cover body is installed on the top of the container. A rotating shaft extending into the container is provided on the cover body. Two stirring blades are oppositely arranged on the rotating shaft. The stirring blades are of an arc structure and a water storage cavity is formed inside. An inlet water channel and an outlet water channel are provided in the rotating shaft. The inlet water channel is communicated with the water storage cavity of one of the stirring blades, the outlet water channel is communicated with the water storage cavity of the other stirring blade, and the water storage cavities of the two stirring blades are communicated with each other.

[0005] The cooling and crystallization device for disodium hydrogen phosphate production provided by the utility model further has the following technical features:

[0006] A communication hole is opened on the rotating shaft, so that the water storage cavities of the two stirring blades are communicated with each other.

[0007] A motor is provided on the cover body. The output shaft of the motor is connected to the rotating shaft. Two water conveying rings sleeved on the rotating shaft are provided on the cover body. Annular water grooves are opened on the inner sides of the water conveying rings. Water pipes communicated with the annular water grooves are provided on the outer sides of the water conveying rings. One of the annular water grooves is communicated with the inlet water channel for supplying water to the inlet water channel, and the other annular water groove is communicated with the outlet water channel for pumping water from the outlet water channel.

[0008] Sealing rings are provided between the rotating shaft and the water conveying rings. The two sealing rings are respectively arranged on the upper and lower sides of the annular water groove, so that the rotating shaft and the water conveying rings are rotationally sealed.

[0009] An installation hole is formed in the cover body, and the rotating shaft is arranged in the installation hole through a bearing and a sealing ring, so that the rotating shaft is rotationally sealed with the cover body.

[0010] A cooling box is arranged on the outer side of the container, and a water inlet and a water outlet are respectively arranged on both sides of the cooling box.

[0011] A plurality of strip-shaped protrusions are arranged on the outer side of the container at intervals along its circumferential direction, and the strip-shaped protrusions are arranged in the cooling box.

[0012] A feed pipe is arranged on the cover body, and a discharge pipe is arranged at the bottom of the container.

[0013] The utility model has the following beneficial effects: the rotating shaft drives the two stirring blades to rotate to stir the disodium hydrogen phosphate solution in the container, and at the same time, the water flowing in the water storage cavity of the stirring blade cools and cools the disodium hydrogen phosphate solution evenly, accelerating the cooling of the solution and improving the cooling crystallization efficiency. At the same time, the arc-shaped stirring blade rotates slowly to reduce the bubbles generated by the solution and avoid affecting the crystallization. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a partial cross-sectional view of the utility model;

[0015] Figure 2 is an axonometric view of the stirring blade;

[0016] Figure 3 is Figure 1 a partial enlarged view of;

[0017] Figure 4 is a structural schematic diagram of the water delivery ring;

[0018] Figure 5 is a cross-sectional view of the container. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The present utility model will be described in detail below with reference to the drawings and in combination with embodiments. It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0020] As Figures 1 to 5 shown, for the cooling crystallization device for the production of disodium hydrogen phosphate of the present utility model, a cover body 11 is installed on the top of a container 10, a rotating shaft 12 extending into the container 10 is arranged on the cover body 11, two stirring blades 13 are oppositely arranged on the rotating shaft 12, the stirring blades 13 are of an arc-shaped structure and a water storage cavity 14 is formed inside, a water inlet channel 15 and a water outlet channel 16 are arranged in the rotating shaft 12, the water inlet channel 15 is communicated with the water storage cavity 14 of one of the stirring blades 13, the water outlet channel 16 is communicated with the water storage cavity 14 of the other stirring blade 13, and the water storage cavities 14 of the two stirring blades 13 are communicated with each other.

[0021] The rotating shaft 12 drives the two stirring blades 13 to rotate to stir the disodium hydrogen phosphate solution in the container 10. At the same time, the water flowing in the water storage cavity 14 of the stirring blade 13 cools and evenly cools down the disodium hydrogen phosphate solution, accelerating the solution cooling and improving the cooling crystallization efficiency. At the same time, the arc-shaped stirring blade 13 rotates slowly to reduce the bubbles generated by the solution and avoid affecting the crystallization.

[0022] Among them, the two stirring blades 13 are both arc-shaped structures and are centrosymmetric about the axis center of the rotating shaft 12.

[0023] Among them, the shape of the water storage cavity 14 is similar to the shape of the stirring blade 13, that is, the water storage cavity 14 is formed by shelling the stirring blade 13 to improve the water storage capacity and heat conduction capacity of the water storage cavity 14.

[0024] Among them, the width of the stirring blade 13 is greater than the diameter of the rotating shaft 12, and the stirring blade is integrally formed with the rotating shaft 12. Rounded corners are provided on the outer side of the stirring blade 13. Of course, rounded corners can be provided on the edges formed on the surface of the stirring blade 13 to reduce the friction with the solution.

[0025] Among them, the cover body 11 is detachably connected to the top of the container 10. A plurality of legs 17 are provided at the bottom of the container 10.

[0026] Preferably, a communication hole 18 is provided on the rotating shaft 12 so that the water storage cavities 14 of the two stirring blades 13 communicate with each other.

[0027] Preferably, referring to Figure 1 、 Figure 3 、 Figure 4 , a motor 21 is provided on the cover body 11. The output shaft of the motor 21 is connected to the rotating shaft 12. Two water delivery rings 22 sleeved on the rotating shaft 12 are provided on the cover body 11. An annular water groove 23 is provided on the inner side of the water delivery ring 22. A water delivery pipe 24 communicating with the annular water groove 23 is provided on the outer side of the water delivery ring 22. One of the annular water grooves 23 communicates with the water inlet passage 15 for supplying water to the water inlet passage 15, and the other annular water groove 23 communicates with the water outlet passage 16 for pumping water from the water outlet passage 16.

[0028] Among them, a circulating water supply module is further included, which includes a water tank, a water pump, a water pipe and corresponding valves, a heat exchange module and a control module, etc., to provide cold water for the water inlet passage 15 and pump out and cool the relatively hot water from the water outlet passage 16, and has the function of circulating and providing cold water. The structure of the circulating water supply module is prior art and will not be elaborated here. One of the water delivery pipes 24 is an inlet pipe, and the other is an outlet pipe, which are respectively connected to the two ends of the circulating water supply module correspondingly.

[0029] Among them, the motor 21 is arranged on the cover body 11 through a support rod 25, and the water delivery ring 22 is arranged on the cover body 11 through a support block 26.

[0030] Preferably, a sealing ring 27 is provided between the rotating shaft 12 and the water delivery ring 22. The two sealing rings 27 are respectively arranged on the upper and lower sides of the annular water tank 23, so that the rotating shaft 12 and the water delivery ring 22 are rotationally sealed.

[0031] Preferably, the cover body 11 is provided with a mounting hole 28. The rotating shaft 12 is arranged in the mounting hole 28 through a bearing 29 and a sealing ring 27, so that the rotating shaft 12 and the cover body 11 are rotationally sealed.

[0032] Preferably, a cooling box 31 is provided on the outer side of the container 10. Water inlets 32 and water outlets 33 are respectively provided on both sides of the cooling box 31 to improve the cooling efficiency of the solution in the container 10.

[0033] Of course, it also includes a circulating water supply module corresponding to the cooling box 31, and its structure is also the prior art, so it will not be elaborated here.

[0034] Preferably, referring to Figure 1 、 Figure 5 , a plurality of strip-shaped protrusions 34 are arranged at intervals along the circumferential direction on the outer side of the container 10. The strip-shaped protrusions 34 are arranged in the cooling box 31 to further improve the cooling efficiency of the solution in the container 10.

[0035] Preferably, the cover body 11 is provided with a feed pipe 35, and the bottom of the container 10 is provided with a discharge pipe 36. Valves are provided on the feed pipe 35 and the discharge pipe 36, and a filter screen 37 is provided in the discharge pipe 35 for filtering to obtain crystals.

[0036] Wherein, the bottom surface inside the container 10 is a conical surface, and the lower surface of the stirring blade 13 is an inclined surface corresponding to the conical surface to facilitate discharging. Of course, the lower surface of the stirring blade 13 can also be far away from the bottom surface inside the container 10, and only the functions of stirring the stirring blade 13 and cooling the solution are realized.

[0037] The working principle of the present utility model is as follows:

[0038] The disodium hydrogen phosphate solution is fed into the container 10 through the water inlet pipe 35. Cold water is introduced into the cooling box 31 through the water inlet 32 to externally cool the disodium hydrogen phosphate solution in the container 10. The motor 18 is started, and the output shaft of the motor 18 drives the rotating shaft 12 to rotate, driving the two stirring blades 13 to rotate to stir the disodium hydrogen phosphate solution in the container 10. At the same time, the water flowing in the water storage cavity 14 of the stirring blade 13 cools the disodium hydrogen phosphate solution evenly, accelerating the cooling of the solution, improving the cooling crystallization efficiency. At the same time, the arc-shaped stirring blade 13 rotates slowly to reduce the bubbles generated by the solution and avoid affecting the crystallization. The disodium hydrogen phosphate solution is filtered through the filter screen 37 to obtain disodium hydrogen phosphate crystals.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cooling crystallization device for the production of disodium hydrogen phosphate, characterized in that, A cover body (11) is installed on the top of the container (10). A rotating shaft (12) extending into the container (10) is provided on the cover body (11). Two stirring blades (13) are oppositely arranged on the rotating shaft (12). The stirring blades (13) are of an arc-shaped structure and a water storage cavity (14) is formed inside. An inlet channel (15) and an outlet channel (16) are provided in the rotating shaft (12). The inlet channel (15) is communicated with the water storage cavity (14) of one of the stirring blades (13), the outlet channel (16) is communicated with the water storage cavity (14) of the other stirring blade (13), and the water storage cavities (14) of the two stirring blades (13) are communicated with each other.

2. The cooling crystallization device for the production of disodium hydrogen phosphate according to claim 1, characterized in that, A communication hole (18) is formed in the rotating shaft (12) so that the water storage cavities (14) of the two stirring blades (13) are communicated with each other.

3. The cooling crystallization device for the production of disodium hydrogen phosphate according to claim 1, characterized in that, A motor (21) is provided on the cover body (11). The output shaft of the motor (21) is connected to the rotating shaft (12). Two water delivery rings (22) sleeved on the rotating shaft (12) are provided on the cover body (11). An annular water groove (23) is formed on the inner side of the water delivery ring (22). A water delivery pipe (24) communicated with the annular water groove (23) is provided on the outer side of the water delivery ring (22). One of the annular water grooves (23) is communicated with the inlet channel (15) for supplying water to the inlet channel (15), and the other annular water groove (23) is communicated with the outlet channel (16) for pumping water from the outlet channel (16).

4. The cooling crystallization device for the production of disodium hydrogen phosphate according to claim 3, characterized in that, A sealing ring (27) is provided between the rotating shaft (12) and the water delivery ring (22). The two sealing rings (27) are respectively arranged on the upper and lower sides of the annular water groove (23) so that the rotating shaft (12) and the water delivery ring (22) are rotationally sealed.

5. The cooling crystallization device for the production of disodium hydrogen phosphate according to claim 1, characterized in that, An installation hole (28) is formed in the cover body (11). The rotating shaft (12) is arranged in the installation hole (28) through a bearing (29) and a sealing ring (27) so that the rotating shaft (12) and the cover body (11) are rotationally sealed.

6. The cooling crystallization device for the production of disodium hydrogen phosphate according to claim 1, characterized in that, A cooling box (31) is provided on the outer side of the container (10). A water inlet (32) and a water outlet (33) are respectively provided on both sides of the cooling box (31).

7. The cooling crystallization device for the production of disodium hydrogen phosphate according to claim 6, characterized in that, A plurality of strip-shaped protrusions (34) are arranged on the outer side of the container (10) at intervals along its circumference. The strip-shaped protrusions (34) are arranged in the cooling box (31).

8. The cooling crystallization device for the production of disodium hydrogen phosphate according to claim 1, characterized in that, A feed pipe (35) is provided on the cover body (11). A discharge pipe (36) is provided at the bottom of the container (10).

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