A vacuum cooling crystallization device for potassium nitrate production

Abstract

The present invention provides a vacuum cooling crystallization device for potassium nitrate production, which relates to the technical field of potassium nitrate production. It includes a crystallization shell, on which a vacuum pump and a steam outlet pipe are fixedly installed. It further includes: a heat conduction and cooling component, a scraping component, a passive component, and a driving component. The heat conduction and cooling component includes an upper rotary joint and a lower rotary joint installed in the middle of the crystallization shell. The lower interface of the upper rotary joint is fixedly connected with a heat conduction and cooling pipe, and the lower end of the heat conduction and cooling pipe is communicated with the lower rotary joint. The heat conduction and cooling pipe is alternately provided with an inner section and an outer section from top to bottom. A long elastic sheet is fixedly connected inside the inner section, and an outer contact sheet is fixedly connected to one end of the long elastic sheet away from the inner section. The provided heat conduction and cooling component, driving component, and cold source component can continuously introduce low-temperature cooling liquid into the crystallization shell, cooperate with the vacuum pump, and accelerate the crystallization of potassium nitrate.

Description

Technical Field

[0001] The present invention relates to the technical field of potassium nitrate production, and specifically relates to a vacuum cooling crystallization device for potassium nitrate production. Background Art

[0002] Potassium nitrate has a good application market, such as being used in making gunpowder, glass, matches, fertilizers, and analytical reagents, etc. When producing potassium nitrate, a vacuum cooling crystallization device needs to be used.

[0003] In related technologies, such as the vacuum cooling crystallizer for potassium nitrate production with the publication number of CN217773291U, a feeding pipe is installed on the upper surface of the crystallization tank, a filtering chamber is installed at the upper end of the feeding pipe, an installation groove is formed in the side wall of the filtering chamber and communicated with the inner wall, a frame adapted to it is arranged in the installation groove, and a filter screen is installed between the inner walls of the frame.

[0004] When this patent works, although it can complete the cooling crystallization operation, however, the crystallized potassium nitrate product is prone to adhere to the inner wall and the bottom wall of the tank under the action of gravity and crystallization stress, and the potassium nitrate product cannot be completely discharged, which affects the discharge amount of potassium nitrate and the normal crystallization operation. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a vacuum cooling crystallization device for potassium nitrate production, which solves the problems that the potassium nitrate product is prone to adhere to the inner wall and the bottom wall of the tank, the potassium nitrate product cannot be completely discharged, and it affects the discharge amount of potassium nitrate and the normal crystallization operation.

[0006] To achieve the above objectives, the present invention is realized through the following technical solutions: A vacuum cooling crystallization device for potassium nitrate production, including a crystallization housing, a vacuum pump, a steam outlet pipe, and a feeding pipe are fixedly installed on the crystallization housing, and a feeding valve is provided on the feeding pipe. It further includes:

[0007] A heat conduction component; the heat conduction component is arranged inside the crystallization housing, and the heat conduction component includes an upper rotary joint and a lower rotary joint installed in the middle of the crystallization housing. The lower interface of the upper rotary joint is fixedly connected with a heat conduction pipe. The lower end of the heat conduction pipe is communicated with the lower rotary joint. The heat conduction pipe is alternately provided with an inner section and an outer section from top to bottom. A long elastic sheet is fixedly connected inside the inner section, and an outer contact sheet is fixedly connected to the end of the long elastic sheet far away from the inner section. The upper rotary joint is communicated with an external cold source component, and the cold source component includes a containing box. The lower rotary joint is communicated with the containing box in the external cold source component;

[0008] A scraping component, the scraping component is arranged inside the outer section of the heat conduction pipe, and the scraping component is used for scraping the potassium nitrate crystals on the inner walls around and at the bottom of the crystallization housing, and increasing the heat absorption area of the heat conduction pipe;

[0009] A passive component, which is arranged between the upper rotary joint and the lower rotary joint; the passive component can be periodically driven to rotate in the same direction by the outer contact piece and rotate in the reverse direction after accumulating torsional force;

[0010] A driving component; the driving component is used to drive the heat conduction component to rotate. By setting the heat conduction component, the driving component and the cold source component, low-temperature coolant can be continuously introduced into the crystallization shell, cooperating with the vacuum pump to accelerate the crystallization of potassium nitrate. The rotation of the heat conduction component can stir the potassium nitrate solution, making the solution fully contact with the heat conduction tube to improve the cooling effect; by setting the scraping component, it can rotate synchronously under the drive of the heat conduction component and continuously scrape the inner side wall and the inner bottom wall of the crystallization shell to prevent potassium nitrate crystals from adhering to the inner side wall and the inner bottom wall of the crystallization shell, reducing the adhesion amount of potassium nitrate crystals and improving the drainage rate of potassium nitrate crystals; by setting the passive component, the inner contact piece rotates in the same direction under the drive of the outer contact piece, rotates in the reverse direction after accumulating torsional force, so that the inner contact piece and the outer contact piece impact and collide with each other, thereby causing the inner contact piece and the outer contact piece to vibrate. Using the transmitted vibration force, potassium nitrate crystals will not adhere to the heat conduction tube and the scraping component, further improving the drainage rate of potassium nitrate.

[0011] Preferably, the driving component includes a fixed frame and a driven gear. The fixed frame is fixedly installed on the crystallization shell. A driving motor is fixedly installed on the fixed frame. The output end of the driving motor is fixedly connected with a driving gear. The driving gear meshes with the driven gear. The driven gear is fixedly installed on the rotating part of the upper rotary joint.

[0012] Preferably, the scraping component includes a heat absorption sheet fixedly installed on the heat conduction tube. One end of the heat absorption sheet away from the outer side section is fixedly connected with a side wall scraping strip. The bottom of the side wall scraping strip is fixedly connected with a bottom wall scraping strip. The heat absorption sheet is used to increase the contact area between the heat conduction tube and the potassium nitrate solution, and can better absorb heat to reduce the temperature of the potassium nitrate solution.

[0013] Preferably, small relief holes are evenly arranged on the heat absorption sheet, and large relief holes are arranged on the side wall scraping strip. The large relief holes and the small relief holes are any one of a circle, a triangle and a square. The side wall scraping strip contacts the inner peripheral walls of the crystallization shell, and the bottom wall scraping strip contacts the inner bottom wall of the crystallization shell. The small relief holes and the large relief holes can be used for the potassium nitrate solution to pass through, facilitating the rotation of the side wall scraping strip and the bottom wall scraping strip.

[0014] Preferably, the passive component includes a lower rotating seat, an upper rotating seat, and a hollow tube. The upper rotating seat is fixedly installed at the center of the rotating part of the upper rotary joint. The lower rotating seat is fixedly installed at the center of the rotating part of the lower rotary joint. The hollow tube is rotatably matched with both the lower rotating seat and the upper rotating seat. Both upper and lower ends of the hollow tube are fixedly connected with torsion spring connecting seats. Passive torsion springs are provided between the torsion spring connecting seats and the lower rotating seat and the upper rotating seat respectively. A short elastic piece is fixedly connected to the hollow tube.

[0015] Preferably, one end of the short elastic piece away from the hollow tube is fixedly connected with an inner contact piece. A counterweight is fixedly connected to the inner contact piece. The inner contact piece contacts the outer contact piece.

[0016] Preferably, the inner section and the outer section are in the shape of a horizontally placed U, and they have the same height.

[0017] Preferably, support legs are fixedly connected to the outside of the crystallization shell. A discharge pipe is fixedly connected to the bottom of the crystallization shell. A control valve is installed on the discharge pipe. The cold source component further includes a coolant, a pump body, and a refrigeration pipe. The refrigeration pipe is arranged in the accommodation box. The pump body pumps out the coolant in the accommodation box and introduces it into the upper rotary joint.

[0018] The present invention provides a vacuum cooling crystallization device for potassium nitrate production, which has the following beneficial effects:

[0019] 1. By setting the heat conduction component, the driving component, and the cold source component, the present invention can continuously introduce low-temperature coolant into the crystallization shell, cooperate with the vacuum pump, and accelerate the crystallization of potassium nitrate. The self-rotation of the heat conduction component can stir the potassium nitrate solution, enabling the solution to fully contact the heat conduction pipe and improving the cooling effect.

[0020] 2. By setting the scraping component, under the drive of the heat conduction component, it can rotate synchronously and continuously scrape the inner side wall and the inner bottom wall of the crystallization shell, preventing potassium nitrate crystals from adhering to the inner side wall and the inner bottom wall of the crystallization shell, reducing the adhesion amount of potassium nitrate crystals, and improving the drainage rate of potassium nitrate crystals.

[0021] 3. By setting the passive component, the inner contact piece rotates in the same direction first under the drive of the outer contact piece, accumulates torsional force and then rotates in the opposite direction, causing the inner contact piece and the outer contact piece to impact and collide with each other, so that the inner contact piece and the outer contact piece vibrate. Using the transmitted vibration force, potassium nitrate crystals will not adhere to the heat conduction pipe and the scraping component, further improving the drainage rate of potassium nitrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is the overall three-dimensional view of the present invention;

[0023] Figure 2 Internal perspective view of the present invention;

[0024] Figure 3 Perspective view of the scraping component, heat conduction guiding component, and passive component of the present invention;

[0025] Figure 4 Perspective view of the component structure of the heat conduction guiding component of the present invention;

[0026] Figure 5 Perspective view of the heat conduction guiding component of the present invention;

[0027] Figure 6 Front view of the heat conduction guiding tube of the present invention;

[0028] Figure 7 Perspective view of the scraping component of the present invention;

[0029] Figure 8 Perspective view of the lower rotary joint and the passive coil spring of the present invention;

[0030] Figure 9 Perspective view of the passive component of the present invention.

[0031] Wherein, 1, support leg; 2, crystallization housing; 3, vacuum pump; 5, fixing frame; 6, drive motor; 7, driving gear; 8, discharge pipe; 9, scraping component; 901, heat absorption fin; 902, side wall scraping strip; 903, bottom wall scraping strip; 904, large load reduction hole; 905, small load reduction hole; 10, heat conduction guiding component; 101, upper rotary joint; 102, upper rotating seat; 103, driven gear; 104, heat conduction guiding tube; 1041, outer section; 1042, inner section; 105, long elastic sheet; 106, outer contact sheet; 107, lower rotary joint; 108, lower rotating seat; 11, passive component; 1101, hollow tube; 1102, inner contact sheet; 1103, short elastic sheet; 1104, counterweight; 1105, coil spring connecting seat; 12, passive coil spring. Detailed implementation manners

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0033] Such as Figures 1-9As shown in the figure, an embodiment of the present invention provides a vacuum cooling crystallization device for potassium nitrate production, which includes a crystallization housing 2. A vacuum pump 3 and a steam outlet pipe are fixedly installed on the crystallization housing 2. A support leg 1 is fixedly connected to the outside of the crystallization housing 2. A discharge pipe 8 and a feed pipe (not shown) are fixedly connected to the bottom of the crystallization housing 2. A feed valve is provided on the feed pipe, and a control valve is installed on the discharge pipe 8. It further includes:

[0034] Reference Figure 1 , the feed pipe is used for adding potassium nitrate solution, and the feed valve thereon is used to control the entry of potassium nitrate solution. The vacuum pump 3 is used to extract the gas in the crystallization housing 2 to achieve the purpose of extracting vacuum. At the same time, a vacuum gauge can be set to intuitively reflect the vacuum degree of the crystallization housing 2. The steam outlet pipe is used to discharge the steam generated by the gasification of water in the potassium nitrate solution under vacuum. The discharge pipe 8 is used to discharge potassium nitrate crystals, and the control valve is used to control the discharge of potassium nitrate crystals. The support leg 1 is used to provide support force for the whole.

[0035] A heat conduction cooling component 10; the heat conduction cooling component 10 is arranged inside the crystallization housing 2. The heat conduction cooling component 10 includes an upper rotary joint 101 and a lower rotary joint 107 installed in the middle of the crystallization housing 2. The lower interface of the upper rotary joint 101 is fixedly connected to a heat conduction cooling pipe 104. The lower end of the heat conduction cooling pipe 104 is communicated with the lower rotary joint 107. The heat conduction cooling pipe 104 is alternately provided with an inner section 1042 and an outer section 1041 from top to bottom. The shapes of the inner section 1042 and the outer section 1041 are U-shaped in a horizontal state. The heights of the inner section 1042 and the outer section 1041 are the same. A long elastic sheet 105 is fixedly connected inside the inner section 1042. One end of the long elastic sheet 105 far from the inner section 1042 is fixedly connected to an outer contact sheet 106. The upper rotary joint 101 is communicated with an external cold source component. The cold source component includes a containing box. The lower rotary joint 107 is communicated with the containing box in the external cold source component. The cold source component further includes a coolant, a pump body, and a refrigeration pipe. The refrigeration pipe is arranged in the containing box. The pump body pumps out the coolant in the containing box and introduces it into the upper rotary joint 101;

[0036] Reference Figure 2 、 Figure 4 、 Figure 5 、 Figure 6, the side surfaces of the long elastic sheet 105 and the outer contact sheet 106 in the length direction do not come into contact with the heat conduction tube 104, ensuring that the long elastic sheet 105 and the outer contact sheet 106 can swing under force to generate vibration force; the refrigeration tube uses existing technology for refrigeration. The pump body can pump the low-temperature coolant in the accommodation tank into the upper rotary joint 101, and then the coolant enters the heat conduction tube 104. The heat conduction tube 104 can conduct heat, absorb the heat in the potassium nitrate solution into the coolant, and then discharge it from the lower rotary joint 107. The high-temperature coolant re-enters the accommodation tank, and the refrigeration tube in the accommodation tank cools the high-temperature coolant, thus facilitating the next heat conduction use. The long elastic sheet 105 is elastic. When the outer contact sheet 106 is stressed, it will swing back and forth to generate vibration force, and the vibration force can be transmitted to the heat conduction tube 104 to prevent potassium nitrate crystals from adhering to the heat conduction tube 104.

[0037] Scraping component 9, the scraping component 9 is arranged in the outer section 1041 of the heat conduction tube 104, and the scraping component 9 is used to scrape the potassium nitrate crystals on the periphery and the inner bottom wall of the crystal housing 2, and increase the heat absorption area of the heat conduction tube 104;

[0038] The scraping component 9 includes a heat absorption sheet 901 fixedly installed on the heat conduction tube 104. One end of the heat absorption sheet 901 away from the outer section 1041 is fixedly connected with a side wall scraping strip 902. The bottom of the side wall scraping strip 902 is fixedly connected with a bottom wall scraping strip 903. Small relief holes 905 are evenly arranged on the heat absorption sheet 901. Large relief holes 904 are arranged on the side wall scraping strip 902. The large relief holes 904 and the small relief holes 905 are any one of circular, triangular, and square. The side wall scraping strip 902 is in contact with the inner wall around the crystal housing 2, and the bottom wall scraping strip 903 is in contact with the inner bottom wall of the crystal housing 2;

[0039] Reference Figure 4 、 Figure 7 , the heat absorption sheet 901 rotates synchronously under the drive of the heat conduction tube 104, thereby driving the side wall scraping strip 902 and the bottom wall scraping strip 903 to rotate. The side wall scraping strip 902 can scrape the inner side wall of the crystal housing 2 and stir the potassium nitrate solution. The bottom wall scraping strip 903 can scrape the inner bottom wall of the crystal housing 2 and stir the potassium nitrate solution. At the same time, the potassium nitrate crystals are in a moving state. The heat absorption sheet 901 can transfer heat and increase the heat absorption of the heat conduction tube 104 from the potassium nitrate solution. The large relief holes 904 and the small relief holes 905 are used for the circulation of the potassium nitrate solution, reducing the resistance of the rotation of the heat absorption sheet 901, the side wall scraping strip 902, and the bottom wall scraping strip 903, and also playing a role in disturbing the flow of the potassium nitrate solution.

[0040] The passive component 11 is disposed between the upper rotary joint 101 and the lower rotary joint 107; the passive component 11 can be periodically driven by the outer contact piece 106 to rotate in the same direction, and after accumulating the button force, it rotates in the reverse direction;

[0041] The upper rotary joint 101 and the lower rotary joint 107 are prior arts, which can provide the normal flow of liquid while rotating.

[0042] The passive component 11 includes a lower rotating seat 108, an upper rotating seat 102, and a hollow tube 1101. The upper rotating seat 102 is fixedly installed at the center of the rotating part of the upper rotary joint 101, the lower rotating seat 108 is fixedly installed at the center of the rotating part of the lower rotary joint 107, the hollow tube 1101 is rotatably matched with both the lower rotating seat 108 and the upper rotating seat 102, and both ends of the upper and lower ends of the hollow tube 1101 are fixedly connected with torsion spring connection seats 1105. Passive torsion springs 12 are provided between the torsion spring connection seats 1105 and the lower rotating seat 108 and the upper rotating seat 102, and a short elastic piece 1103 is fixedly connected to the hollow tube 1101;

[0043] The design of the hollow tube 1101 and the counterweight 1104 shifts the center of gravity of the passive component 11 to the outside, making it more convenient to be driven.

[0044] One end of the short elastic piece 1103 away from the hollow tube 1101 is fixedly connected with an inner contact piece 1102, a counterweight 1104 is fixedly connected to the inner contact piece 1102, and the inner contact piece 1102 is in contact with the outer contact piece 106;

[0045] Reference Figure 9 、 Figure 8 、 Figure 4, during implementation, the length range of the contact part between the inner contact piece 1102 and the outer contact piece 106 is 1 - 2 centimeters. The greater the length of the contact part between the inner contact piece 1102 and the outer contact piece 106, the greater the force that can be provided for the contraction of the passive coil spring 12. Conversely, the force for the contraction of the passive coil spring 12 is smaller. At the same time, it can also provide a greater driving force for the long elastic piece 105 and the short elastic piece 1103, enabling the long elastic piece 105 and the short elastic piece 1103 to swing to generate a vibration force. The weight of the hollow tube 1101 is small, which facilitates the rotation of the hollow tube 1101. Since the inner contact piece 1102 and the outer contact piece 106 are in contact with each other, the inner contact piece 1102 will be driven by the outer contact piece 106 to rotate synchronously in the same direction. Due to the setting of the passive coil spring 12, the inner end of the passive coil spring 12 is gradually contracted under the drive of the coil spring connection seat 1105, accumulating elastic force. The long elastic piece 105 and the short elastic piece 1103 both bend. When the accumulated elastic force is greater than the elastic force of the long elastic piece 105, the outer contact piece 106 cannot drive the inner contact piece 1102 to rotate. Under the drive of the passive coil spring 12, the hollow tube 1101 rotates in the reverse direction. The initially contacted inner contact piece 1102 and outer contact piece 106 will swing reciprocally, generating a vibration force. Under the action of the counterweight 1104, the passive component 11 has a greater inertia when rotating in the reverse direction. Therefore, it will overcome the resistance of the potassium nitrate solution and the outer contact piece 106 and rotate in the reverse direction for a certain distance, making contact and collision with the outer contact piece 106 at other positions. Therefore, multiple outer contact pieces 106 swing and vibrate in sequence until the elastic force of the passive coil spring 12 is completely released, and then the above process is repeated periodically;

[0046] As the amount of potassium nitrate crystals increases, the potassium nitrate crystals will accumulate at the bottom of the crystallization housing 2 under the action of gravity. The lowermost inner contact piece 1102, outer contact piece 106, long elastic piece 105, and short elastic piece 1103 will be located within the potassium nitrate crystals, and will not only be subject to the resistance of the potassium nitrate solution, but also the resistance of the potassium nitrate crystals. Under the same driving force, compared with the inner contact piece 1102, outer contact piece 106, long elastic piece 105, and short elastic piece 1103 outside the potassium nitrate crystals, the swing frequency and amplitude of the lowermost inner contact piece 1102, outer contact piece 106, long elastic piece 105, and short elastic piece 1103 will become smaller. At this time, the lowermost inner contact piece 1102, outer contact piece 106, long elastic piece 105, and short elastic piece 1103 not only provide the function of driving the movement of the potassium nitrate solution and generating vibrations, but also provide the function of driving the movement of the potassium nitrate crystals, so that the dispersed potassium nitrate crystals will not aggregate into blocks, affecting the subsequent discharge of the potassium nitrate crystals, and ensuring that the potassium nitrate crystals can be smoothly discharged. Therefore, the lowermost inner contact piece 1102, outer contact piece 106, long elastic piece 105, and short elastic piece 1103 should be located within the potassium nitrate crystals. The preferred solution is that the value between the lowermost inner contact piece 1102, outer contact piece 106, long elastic piece 105, and short elastic piece 1103 and the bottom wall of the crystallization housing 2 is half of the total thickness value. For example, if the total thickness value of the potassium nitrate crystals is 40 cm, the value between the lowermost inner contact piece 1102, outer contact piece 106, long elastic piece 105, and short elastic piece 1103 and the bottom wall of the crystallization housing 2 is 20 cm. The spacing of the inner contact piece 1102, outer contact piece 106, long elastic piece 105, and short elastic piece 1103 at different heights in the vertical direction can be selected to be the same distance;

[0047] In other embodiments, the spacing of the inner contact piece 1102, outer contact piece 106, long elastic piece 105, and short elastic piece 1103 at different heights in the vertical direction can be selected to gradually increase from bottom to top. For example, the distances of the inner contact piece 1102, outer contact piece 106, long elastic piece 105, and short elastic piece 1103 at different heights in the vertical direction from bottom to top are 30 cm and 40 cm respectively. At this time, the least number of inner contact pieces 1102, outer contact pieces 106, long elastic pieces 105, and short elastic pieces 1103 can be used to provide sufficient mixing driving force for a large amount of potassium nitrate solution, achieving the purpose of saving manufacturing costs; the spacing of the inner contact piece 1102, outer contact piece 106, long elastic piece 105, and short elastic piece 1103 at different heights in the vertical direction can also be selected to gradually decrease from bottom to top. For example, the distances of the inner contact piece 1102, outer contact piece 106, long elastic piece 105, and short elastic piece 1103 at different heights in the vertical direction from bottom to top are 40 cm and 30 cm respectively. At this time, good mixing driving force can be provided for the upper potassium nitrate solution, and the mixing is sufficient.

[0048] Drive assembly; the drive assembly is used to drive the heat conduction component 10 to rotate self - sufficiently. The drive assembly includes a fixed frame 5 and a driven gear 103. The fixed frame 5 is fixedly installed on the crystallization shell 2. A drive motor 6 is fixedly installed on the fixed frame 5. The output end of the drive motor 6 is fixedly connected with a driving gear 7. The driving gear 7 meshes with the driven gear 103. The driven gear 103 is fixedly installed on the rotating part of the upper rotary joint 101;

[0049] Reference Figure 1 、 Figure 2 , during the driving operation, under the action of a peripheral controller and a power source, the drive motor 6 drives the driving gear 7 to rotate. The driving gear 7 drives the driven gear 103 to rotate. The driven gear 103 drives the rotating part of the upper rotary joint 101 to rotate, so as to drive the heat conduction pipe 104 to rotate, and the driving is reliable.

[0050] Working principle: The vacuum pump 3 is used to extract the gas in the crystallization shell 2 to achieve the purpose of vacuum extraction. During the driving operation, under the action of a peripheral controller and a power source, the drive motor 6 drives the driving gear 7 to rotate. The driving gear 7 drives the driven gear 103 to rotate. The driven gear 103 drives the rotating part of the upper rotary joint 101 to rotate, so as to drive the heat conduction pipe 104 to rotate;

[0051] While the heat conduction pipe 104 is rotating, the pump body can pump the low - temperature coolant in the accommodation tank and introduce it into the upper rotary joint 101. Then the coolant enters the heat conduction pipe 104. The heat conduction pipe 104 can conduct heat, absorb the heat in the potassium nitrate solution into the coolant, and then discharge it from the lower rotary joint 107. The high - temperature coolant re - enters the accommodation tank, and the refrigeration pipe in the accommodation tank cools the high - temperature coolant, so as to facilitate the next heat conduction use;

[0052] The heat absorption fin 901 rotates synchronously under the drive of the heat conduction pipe 104, so as to drive the side - wall scraping strip 902 and the bottom - wall scraping strip 903 to rotate. The side - wall scraping strip 902 can scrape the inner side - wall of the crystallization shell 2 and stir the potassium nitrate solution. The bottom - wall scraping strip 903 can scrape the inner bottom - wall of the crystallization shell 2 and stir the potassium nitrate solution. At the same time, the potassium nitrate crystal is in a moving state. The heat absorption fin 901 can transfer heat, increasing the heat absorption of the heat conduction pipe 104 from the potassium nitrate solution. The large relief holes 904 and the small relief holes 905 are used for the flow of the potassium nitrate solution, reducing the resistance of the rotation of the heat absorption fin 901, the side - wall scraping strip 902 and the bottom - wall scraping strip 903, and also playing a role in disturbing the flow of the potassium nitrate solution;

[0053] The weight of the hollow tube 1101 is small, which facilitates the rotation of the hollow tube 1101. Since the inner contact piece 1102 is in contact with the outer contact piece 106, the inner contact piece 1102 will be driven by the outer contact piece 106 to rotate synchronously in the same direction. Due to the setting of the passive coil spring 12, the inner end of the passive coil spring 12 gradually contracts under the drive of the coil spring connection seat 1105, accumulating elastic force, and both the long elastic piece 105 and the short elastic piece 1103 are bent. When the accumulated elastic force is greater than the elastic force of the long elastic piece 105, the outer contact piece 106 cannot drive the inner contact piece 1102 to rotate. Under the drive of the passive coil spring 12, the hollow tube 1101 rotates in the reverse direction, and the initially contacted inner contact piece 1102 and outer contact piece 106 will swing reciprocally, generating a vibration force. Under the action of the counterweight 1104, the inertia of the reverse rotation of the passive component 11 is greater. Therefore, it will overcome the resistance of the potassium nitrate solution and the outer contact piece 106 and rotate in the reverse direction for a certain distance, making contact and collision with the outer contact piece 106 at other positions. Therefore, multiple outer contact pieces 106 swing and vibrate in sequence until the elastic force of the passive coil spring 12 is completely released, and then the above process is repeated periodically;

[0054] The steam outlet pipe is used to discharge the steam generated by the vaporization of water in the potassium nitrate solution under vacuum. The discharge pipe 8 is used to discharge the potassium nitrate crystals, and the control valve is used to control the discharge of the potassium nitrate crystals.

[0055] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A vacuum cooling crystallization device for potassium nitrate production, comprising a crystallization shell (2), on which a vacuum pump (3), a steam outlet pipe, and a feed pipe are fixedly mounted, and the feed pipe is provided with a feed valve, characterized in that: Also includes: A cooling assembly (10); the cooling assembly (10) is arranged inside the crystallization shell (2), the cooling assembly (10) comprises an upper rotating joint (101) and a lower rotating joint (107) installed in the middle of the crystallization shell (2), the lower interface of the upper rotating joint (101) is fixedly connected to a cooling pipe (104), the lower end of the cooling pipe (104) and the lower rotating joint (107) are mutually communicated, the cooling pipe (104) is alternately provided with inner sections (1042) and outer sections (1041) from top to bottom, the inner section (1042) is fixedly connected to a long elastic sheet (105), and one end of the long elastic sheet (105) away from the inner section (1042) is fixedly connected to an external contact sheet (106), the upper rotating joint (101) is mutually communicated with an external cold source assembly, the cold source assembly comprises a containing box, and the lower rotating joint (107) is mutually communicated with the containing box in the external cold source assembly; The shapes of the inner section (1042) and the outer section (1041) are U-shaped in a horizontal state, and the heights of the inner section (1042) and the outer section (1041) are the same; a scraping assembly (9), the scraping assembly (9) being arranged in an outer section (1041) of the cooling tube (104), the scraping assembly (9) being used to scrape potassium nitrate crystals on the periphery and bottom inner wall of the crystallization shell (2) and to increase the heat absorption area of ​​the cooling tube (104); A passive component (11), the passive component (11) being arranged between the upper rotary joint (101) and the lower rotary joint (107); the passive component (11) can be periodically driven by the external contact piece (106) to rotate in the same direction, and can rotate in the opposite direction after accumulating a button force; The passive component (11) comprises a lower rotating seat (108), an upper rotating seat (102), and a hollow tube (1101); the upper rotating seat (102) is fixedly mounted at the center of the rotating part of the upper rotating joint (101); the lower rotating seat (108) is fixedly mounted at the center of the rotating part of the lower rotating joint (107); the hollow tube (1101) is rotatably matched with the lower rotating seat (108) and the upper rotating seat (102); the upper and lower ends of the hollow tube (1101) are fixedly connected with a coil spring connecting seat (1105); a passive coil spring (12) is provided between the coil spring connecting seat (1105) and the lower rotating seat (108) and the upper rotating seat (102); and a short elastic sheet (1103) is fixedly connected to the hollow tube (1101); A driving assembly; the driving assembly is used to drive the cooling assembly (10) to rotate.

2. A vacuum cooling crystallization device for potassium nitrate production according to claim 1, characterized in that: The driving assembly comprises a fixed frame (5) and a driven gear (103); the fixed frame (5) is fixedly mounted on the crystal shell (2); a driving motor (6) is fixedly mounted on the fixed frame (5); an output end of the driving motor (6) is fixedly connected to a driving gear (7); the driving gear (7) and the driven gear (103) are meshed with each other; and the driven gear (103) is fixedly mounted on the rotating part of the upper rotary joint (101).

3. A vacuum cooling crystallization device for potassium nitrate production according to claim 1, characterized in that: The scraping assembly (9) comprises a heat absorbing sheet (901) fixedly mounted on the cooling tube (104), one end of the heat absorbing sheet (901) away from the outer section (1041) being fixedly connected to a side wall scraping strip (902), and the bottom of the side wall scraping strip (902) being fixedly connected to a bottom wall scraping strip (903).

4. A vacuum cooling crystallization device for potassium nitrate production according to claim 3, characterized in that: The heat absorbing sheet (901) is evenly provided with small load-reducing holes (905), and the side wall scraping strip (902) is provided with large load-reducing holes (904). The large load-reducing holes (904) and the small load-reducing holes (905) are any one of circular, triangular, and square shapes. The side wall scraping strip (902) is in contact with the surrounding inner walls of the crystallization shell (2), and the bottom wall scraping strip (903) is in contact with the inner bottom wall of the crystallization shell (2).

5. A vacuum cooling crystallization device for potassium nitrate production according to claim 1, characterized in that: An end of the short elastic piece (1103) away from the hollow tube (1101) is fixedly connected to an inner contact piece (1102), a counterweight (1104) is fixedly connected to the inner contact piece (1102), and the inner contact piece (1102) and the outer contact piece (106) are in contact with each other.

6. A vacuum cooling crystallization device for potassium nitrate production according to claim 1, characterized in that: The outside of the crystallization shell (2) is fixedly connected to a support leg (1), the bottom of the crystallization shell (2) is fixedly connected to a discharge pipe (8), a control valve is installed on the discharge pipe (8), the cold source component also includes a coolant, a pump body, and a refrigeration pipe, the refrigeration pipe is arranged in the containing box, and the pump body extracts the coolant in the containing box and introduces it into the upper rotary joint (101).

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