Vacuum cooling crystallization device for potassium nitrate production

Abstract

The invention provides a vacuum cooling crystallization device for potassium nitrate production, and relates to the technical field of potassium nitrate production. The device comprises a crystallization shell, a vacuum pump and a steam outlet pipe are fixedly installed on the crystallization shell, the device further comprises a cold conduction assembly, a scraping assembly, a driven assembly and a driving assembly, the cold conduction assembly comprises an upper rotating connector and a lower rotating connector which are installed in the middle of the crystallization shell, and a lower connector of the upper rotating connector is fixedly connected with a cold conduction pipe; the lower end of the cold guide pipe is communicated with the lower rotating connector, the cold guide pipe is alternately provided with an inner side section and an outer side section from top to bottom, a long elastic piece is fixedly connected into the inner side section, and the end, away from the inner side section, of the long elastic piece is fixedly connected with an outer contact piece. And the arranged cold conduction assembly, the driving assembly and the cold source assembly can continuously introduce low-temperature cooling liquid into the crystallization shell and cooperate with the vacuum pump, so that crystallization of potassium nitrate is accelerated.

Description

Technical Field

[0001] The invention relates to the technical field of potassium nitrate production, in particular 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. When producing potassium nitrate, a vacuum cooling crystallization device is required.

[0003] In the related art, such as the vacuum cooling crystallizer for potassium nitrate production with announcement number: CN217773291U, a feed pipe is installed on the upper surface of the crystallizer, a filter chamber is installed at the upper end of the feed pipe, a mounting groove is opened on the side of the filter chamber connected to the inner wall, a frame compatible with it is arranged in the mounting groove, and a filter screen is installed between the inner walls of the frame.

[0004] When this patent is working, although the cooling and crystallization operation can be completed, the crystallized potassium nitrate product is easy to adhere to the inner wall and bottom wall of the tank under the action of gravity and crystallization stress, and the potassium nitrate product cannot be completely discharged, affecting the discharge amount of potassium nitrate and the normal crystallization operation. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a vacuum cooling crystallization device for potassium nitrate production, which solves the problem that the potassium nitrate product is easily adhered to the inner wall and the bottom wall of the tank body, the potassium nitrate product cannot be completely discharged, and the discharge amount of potassium nitrate and normal crystallization operation are affected.

[0006] To achieve the above objectives, the present invention is implemented by the following technical scheme: A vacuum cooling crystallization device for potassium nitrate production, comprising a crystallization shell, on which a vacuum pump, a steam outlet pipe, and a feed pipe are fixedly installed, and a feed valve is provided on the feed pipe, and further comprising: A cooling assembly; the cooling assembly is arranged inside the crystal shell, the cooling assembly comprises an upper rotating joint and a lower rotating joint installed in the middle of the crystal shell, the lower interface of the upper rotating joint is fixedly connected with a cooling pipe, the lower end of the cooling pipe is communicated with the lower rotating joint, the cooling pipe is alternately provided with inner sections and outer sections from top to bottom, a long elastic sheet is fixedly connected inside the inner section, an end of the long elastic sheet away from the inner section is fixedly connected with an outer contact sheet, the upper rotating joint is communicated with an external cold source assembly, the cold source assembly comprises a containing box, and the lower rotating joint is communicated with the containing box in the external cold source assembly; A scraping assembly, which is arranged in the outer section of the cooling tube and is used to scrape potassium nitrate crystals around the crystallization shell and on the inner wall of the bottom, and increase the heat absorption area of ​​the cooling tube; A passive component, the passive component is arranged between the upper rotary joint and the lower rotary joint; the passive component can be periodically driven by the external contact piece to rotate in the same direction, and rotate in the opposite direction after accumulating the button force; Driving component; the driving component is used to drive the self-rotation of the cooling component. Through the provided cooling component, driving component, and cold source component, low-temperature coolant can be continuously introduced into the crystallization shell, and cooperate with the vacuum pump to accelerate the crystallization of potassium nitrate. The self-rotation of the cooling component can stir the potassium nitrate solution, so that the solution is fully in contact with the cooling tube, thereby improving the cooling effect; through the provided scraping component, the inner side wall and the inner bottom wall of the crystallization shell can be synchronously rotated under the drive of the cooling component, and the inner side wall and the inner bottom wall of the crystallization shell can be continuously scraped to prevent potassium nitrate crystals from adhering to the inner side wall and the inner bottom wall of the crystallization shell, thereby reducing the adhesion amount of potassium nitrate crystals and improving the discharge rate of potassium nitrate crystals; through the provided passive component, the inner contact sheet is driven by the outer contact sheet, first rotates in the same direction, and then rotates in the opposite direction after accumulating button force, so that the inner contact sheet and the outer contact sheet impact and collide with each other, thereby causing the inner contact sheet and the outer contact sheet to vibrate, and the transmitted vibration force is used to prevent potassium nitrate crystals from adhering to the cooling tube and the scraping component, thereby further improving the discharge rate of potassium nitrate.

[0007] Preferably, the driving assembly includes a fixed frame and a driven gear, the fixed frame is fixedly mounted on the crystal shell, a driving motor is fixedly mounted on the fixed frame, an output end of the driving motor is fixedly connected to a driving gear, the driving gear and the driven gear are meshed with each other, and the driven gear is fixedly mounted on the rotating part of the upper rotary joint.

[0008] Preferably, the scraping assembly includes a heat absorbing sheet fixedly mounted on the cooling tube, the end of the heat absorbing sheet away from the outer section is fixedly connected to a side wall scraping strip, and the bottom of the side wall scraping strip is fixedly connected to a bottom wall scraping strip. The heat absorbing sheet is used to increase the contact area between the cooling tube and the potassium nitrate solution, which can better absorb heat and reduce the temperature of the nitric acid rack solution.

[0009] Preferably, the heat absorbing sheet is evenly provided with small relief holes, the side wall scraping strip is provided with large relief holes, the large relief holes and the small relief holes are any one of circular, triangular and square, the side wall scraping strip is in contact with the inner walls of the crystal shell, and the bottom wall scraping strip is in contact with the inner bottom wall of the crystal shell. The small relief holes and the large relief holes can be used for potassium nitrate solution to pass through, so as to facilitate the rotation of the side wall scraping strip and the bottom wall scraping strip.

[0010] 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 rotating joint, and the lower rotating seat is fixedly installed at the center of the rotating part of the lower rotating joint. The hollow tube is rotatably matched with the lower rotating seat and the upper rotating seat. The upper and lower ends of the hollow tube are fixedly connected with a coil spring connecting seat, and a passive coil spring is provided between the coil spring connecting seat and the lower rotating seat and the upper rotating seat. A short elastic sheet is fixedly connected to the hollow tube.

[0011] Preferably, one end of the short elastic piece away from the hollow tube is fixedly connected to an inner contact piece, a counterweight is fixedly connected to the inner contact piece, and the inner contact piece is in contact with the outer contact piece.

[0012] Preferably, the inner section and the outer section are in a horizontal U-shape, and the inner section and the outer section have the same height.

[0013] Preferably, the outside of the crystallization shell is fixedly connected to a support leg, the bottom of the crystallization shell is fixedly connected to a discharge pipe, a control valve is installed on the discharge pipe, the cold source assembly also includes a coolant, a pump body, and a refrigeration pipe, the refrigeration pipe is arranged in the containing box, and the pump body draws out the coolant in the containing box and introduces it into the upper rotary joint.

[0014] The present invention provides a vacuum cooling crystallization device for potassium nitrate production, which has the following beneficial effects: 1. The present invention can continuously pass low-temperature coolant into the crystallization shell through the cooling component, driving component and cold source component, cooperate with the vacuum pump to accelerate the crystallization of potassium nitrate, and the rotation of the cooling component can stir the potassium nitrate solution so that the solution is fully in contact with the cooling pipe, thereby improving the cooling effect.

[0015] 2. The scraping component provided in the present invention can rotate synchronously under the drive of the cooling component to continuously scrape the inner side wall and the inner bottom wall of the crystallization shell, thereby 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 removal rate of potassium nitrate crystals.

[0016] 3. The present invention sets a passive component. The inner contact sheet is driven by the outer contact sheet to rotate in the same direction first, and then rotates in the opposite direction after accumulating button force, so that the inner contact sheet and the outer contact sheet impact and collide with each other, thereby causing the inner contact sheet and the outer contact sheet to vibrate. The transmitted vibration force is utilized to prevent potassium nitrate crystals from adhering to the cooling pipe and the scraping assembly, thereby further improving the potassium nitrate discharge rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an overall stereogram of the present invention; Figure 2 is an internal stereogram of the present invention; Figure 3 It is a three-dimensional diagram of the scraping component, the cooling component, and the passive component of the present invention; Figure 4 A three-dimensional diagram of the structure of the cooling conduction assembly of the present invention; Figure 5 A three-dimensional diagram of the cooling assembly of the present invention; Figure 6 It is a front view of the cooling tube of the present invention; Figure 7 A three-dimensional diagram of a scraping assembly of the present invention; Figure 8 A three-dimensional diagram of the lower rotary joint and the passive coil spring of the present invention; Fig. 9 It is a three-dimensional diagram of the passive component of the present invention.

[0018] Among them, 1. support leg; 2. crystal shell; 3. vacuum pump; 5. fixed frame; 6. drive motor; 7. driving gear; 8. discharge pipe; 9. scraper assembly; 901. heat absorption plate; 902. side wall scraper strip; 903. bottom wall scraper strip; 904. large load-reducing hole; 905. small load-reducing hole; 10. cooling assembly; 101. upper rotary joint; 102. upper rotating seat; 103. driven gear; 104. cooling pipe; 1041. outer section; 1042. inner section; 105. long elastic sheet; 106. outer contact sheet; 107. lower rotary joint; 108. lower rotating seat; 11. passive assembly; 1101. hollow tube; 1102. inner contact sheet; 1103. short elastic sheet; 1104. counterweight block; 1105. coil spring connection seat; 12. passive coil spring. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] like Figure 1-Figure 9 As shown, the embodiment of the present invention provides a vacuum cooling crystallization device for potassium nitrate production, including a crystallization shell 2, on which a vacuum pump 3 and a steam outlet pipe are fixedly installed, 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 and a feed pipe (not shown), the feed pipe is provided with a feed valve, and the discharge pipe 8 is installed with a control valve, and also includes: refer to Figure 1The feed pipe is used for adding potassium nitrate solution, and the feed valve thereon is used for controlling the entry of potassium nitrate solution. The vacuum pump 3 is used for extracting the gas in the crystallization shell 2 to achieve the purpose of extracting vacuum. At the same time, a vacuum meter can be provided to intuitively reflect the vacuum degree of the crystallization shell 2. The steam outlet pipe is used for discharging the steam generated by the vaporization of water in the potassium nitrate solution under vacuum state. The discharge pipe 8 is used for discharging potassium nitrate crystals. The control valve is used for controlling the discharge of potassium nitrate crystals. The support leg 1 is used for providing support force for the whole.

[0021] The cooling assembly 10 is arranged inside the crystal shell 2, and the cooling assembly 10 includes an upper rotating joint 101 and a lower rotating joint 107 installed in the middle of the crystal shell 2. The lower interface of the upper rotating joint 101 is fixedly connected with a cooling pipe 104, and the lower end of the cooling pipe 104 is connected to the lower rotating joint 107. The cooling pipe 104 is alternately provided with inner sections 1042 and outer sections 1041 from top to bottom. The shapes of the inner sections 1042 and the outer sections 1041 are U-shaped in a horizontal state. The inner sections 1042 and The heights of the outer sections 1041 are the same, a long elastic sheet 105 is fixedly connected inside the inner section 1042, an end of the long elastic sheet 105 away from the inner section 1042 is fixedly connected to an outer contact sheet 106, the upper rotary joint 101 is interconnected with an external cold source assembly, the cold source assembly includes a containing box, the lower rotary joint 107 is interconnected with the containing box in the external cold source assembly, the cold source assembly 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; refer to Figure 2 , Figure 4 , Figure 5 , Figure 6 The sides of the long elastic sheet 105 and the outer contact sheet 106 in the length direction do not contact each other with the cooling tube 104, ensuring that the long elastic sheet 105 and the outer contact sheet 106 can be forced to swing and generate vibration force; the refrigeration tube adopts the existing technology for refrigeration use, the pump body can draw the low-temperature coolant in the containing box and introduce it into the upper rotary joint 101, and then the coolant enters the cooling tube 104, the cooling 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 containing box, the refrigeration tube in the containing box cools the high-temperature coolant, so as to facilitate the next cooling use, the long elastic sheet 105 is elastic, when the outer contact sheet 106 is subjected to force, it will swing back and forth to generate vibration force, the vibration force can be transmitted to the cooling tube 104, to prevent the potassium nitrate crystals from adhering to the cooling tube 104.

[0022] A scraping assembly 9, which is disposed in the outer section 1041 of the cooling tube 104, and is used to scrape potassium nitrate crystals around the crystallization shell 2 and on the bottom inner wall, and to increase the heat absorption area of ​​the cooling tube 104; The scraping assembly 9 includes a heat absorbing sheet 901 fixedly mounted on the cooling tube 104, an end of the heat absorbing sheet 901 away from the outer section 1041 is fixedly connected to a side wall scraping strip 902, the bottom of the side wall scraping strip 902 is fixedly connected to a bottom wall scraping strip 903, small load-reducing holes 905 are evenly arranged on the heat absorbing sheet 901, and large load-reducing holes 904 are arranged on the side wall scraping strip 902, and the large load-reducing holes 904 and the small load-reducing holes 905 are any one of circular, triangular, and square, the side wall scraping strip 902 is in contact with the 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; refer to Figure 4 , Figure 7 The heat absorbing sheet 901 rotates synchronously under the drive of the cooling 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 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 crystals are in a state of motion. The heat absorbing sheet 901 can transfer heat and increase the absorption of heat of the potassium nitrate solution by the cooling tube 104. The large load-reducing hole 904 and the small load-reducing hole 905 are used for the circulation of the potassium nitrate solution, reducing the resistance of the heat absorbing sheet 901, the side wall scraping strip 902 and the bottom wall scraping strip 903 to rotate, and also play a disturbing role on the potassium nitrate solution.

[0023] Passive component 11, the passive component 11 is 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 rotate in the opposite direction after accumulating the button force; The upper rotary joint 101 and the lower rotary joint 107 are prior art, which can satisfy the rotation and provide normal flow of liquid.

[0024] 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 rotating joint 101. The lower rotating seat 108 is fixedly installed 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. A short elastic sheet 1103 is fixedly connected to the hollow tube 1101. The design of the hollow tube 1101 and the counterweight block 1104 shifts the center of gravity of the passive component 11 to the outside, making it easier to be driven.

[0025] 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 block 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; refer to Fig. 9 , Figure 8 , Figure 4 In implementation, the length of the contact portion between the inner contact piece 1102 and the outer contact piece 106 is in the range of 1-2 cm. The longer the contact portion between the inner contact piece 1102 and the outer contact piece 106 is, the greater the force provided for the contraction of the passive coil spring 12, and vice versa, the contraction force of the passive coil spring 12 is smaller. At the same time, a greater pulling force can be provided for the long elastic piece 105 and the short elastic piece 1103, so that the long elastic piece 105 and the short elastic piece 1103 can swing to generate 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 at the coil spring connecting seat 1105. Driven by, it gradually contracts and accumulates elastic force, and the long elastic sheet 105 and the short elastic sheet 1103 are bent. When the accumulated elastic force is greater than the elastic force of the long elastic sheet 105, the outer contact sheet 106 cannot drive the inner contact sheet 1102 to rotate. Driven by the passive coil spring 12, the hollow tube 1101 rotates in the opposite direction, and the inner contact sheet 1102 and the outer contact sheet 106 that are initially in contact will swing back and forth, generating a vibration force. Under the action of the counterweight 1104, the inertia of the passive component 11 rotating in the opposite direction is greater. Therefore, it will overcome the resistance of the potassium nitrate solution and the outer contact sheet 106, rotate in the opposite direction for a distance, and contact and collide with the outer contact sheets 106 at other positions. Therefore, multiple outer contact sheets 106 swing and vibrate in turn until the elastic force of the passive coil spring 12 is completely released, and then the above process is repeated periodically. As the potassium nitrate crystals increase, the potassium nitrate crystals will gather at the bottom of the crystal shell 2 under the action of gravity, and the inner contact piece 1102, the outer contact piece 106, the long elastic piece 105 and the short elastic piece 1103 at the bottom will be located in the potassium nitrate crystals, and will be subject to the resistance of not only the potassium nitrate solution but also the potassium nitrate crystals. Under the same pulling force, compared with the inner contact piece 1102, the outer contact piece 106, the long elastic piece 105 and the short elastic piece 1103 outside the potassium nitrate crystals, the swing frequency and amplitude of the inner contact piece 1102, the outer contact piece 106, the long elastic piece 105 and the short elastic piece 1103 at the bottom will become smaller. At this time, the inner contact piece 1102, the outer contact piece 106, the long elastic piece 105 and the short elastic piece 1103 at the bottom not only provide the function of driving the potassium nitrate solution to move and generate vibration, but also provide the function of driving the potassium nitrate crystals to move. , so that the dispersed potassium nitrate crystals will not aggregate into blocks, affecting the subsequent discharge of potassium nitrate crystals, and ensuring that the potassium nitrate crystals can be discharged smoothly. Therefore, the inner contact sheet 1102, the outer contact sheet 106, the long elastic sheet 105 and the short elastic sheet 1103 at the bottom should be located in the potassium nitrate crystals. The preferred solution is that the value between the inner contact sheet 1102, the outer contact sheet 106, the long elastic sheet 105 and the short elastic sheet 1103 at the bottom and the bottom wall of the crystal shell 2 is half of the total thickness value. For example, the total thickness value of the potassium nitrate crystals is 40 cm, and the value between the inner contact sheet 1102, the outer contact sheet 106, the long elastic sheet 105 and the short elastic sheet 1103 at the bottom and the bottom wall of the crystal shell 2 is 20 cm. The spacing in the vertical direction of the inner contact sheets 1102, the outer contact sheets 106, the long elastic sheets 105 and the short elastic sheets 1103 at different heights can be selected to be the same distance; In other embodiments, the vertical spacing of the inner contact sheets 1102, the outer contact sheets 106, the long elastic sheets 105, and the short elastic sheets 1103 of different heights can be selected to gradually increase from bottom to top. For example, the vertical spacing of the inner contact sheets 1102, the outer contact sheets 106, the long elastic sheets 105, and the short elastic sheets 1103 of different heights are 30 cm and 40 cm respectively from bottom to top. In this case, the minimum number of inner contact sheets 1102, the outer contact sheets 106, the long elastic sheets 105, and the short elastic sheets 1103 can be used as a large number. The potassium nitrate solution provides a driving force for sufficient mixing, thereby saving manufacturing costs; the vertical spacing of the inner contact sheet 1102, the outer contact sheet 106, the long elastic sheet 105 and the short elastic sheet 1103 of different heights can also be selected to gradually decrease from bottom to top. For example, the vertical spacing of the inner contact sheet 1102, the outer contact sheet 106, the long elastic sheet 105 and the short elastic sheet 1103 of different heights are 40 cm and 30 cm respectively from bottom to top. At this time, a good mixing driving force can be provided for the upper potassium nitrate solution, and mixing can be sufficient.

[0026] Driving assembly: The driving assembly is used to drive the cooling assembly 10 to rotate. The driving assembly includes 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. The 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. The driven gear 103 is fixedly mounted on the rotating part of the upper rotary joint 101. refer to Figure 1 , Figure 2 During the driving operation, the driving motor 6 drives the driving gear 7 to rotate under the action of the external controller and the power supply, and the driving gear 7 drives the driven gear 103 to rotate, and the driven gear 103 drives the rotating part of the upper rotating joint 101 to rotate, thereby driving the cooling tube 104 to rotate, and the driving is reliable.

[0027] 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, the driving motor 6 drives the driving gear 7 to rotate under the action of the external controller and the power supply, and the driving gear 7 drives the driven gear 103 to rotate, and the driven gear 103 drives the rotating part of the upper rotary joint 101 to rotate, thereby driving the cooling pipe 104 to rotate; While the cooling tube 104 rotates, the pump body can draw the low-temperature coolant in the containing box and guide it into the upper rotary joint 101. Then the coolant enters the cooling tube 104. The cooling tube 104 can conduct heat and absorb the heat in the potassium nitrate solution into the coolant. Then, the coolant is discharged from the lower rotary joint 107. The high-temperature coolant re-enters the containing box. The refrigeration pipe in the containing box cools down the high-temperature coolant, so as to facilitate the next use of the cooling tube. The heat absorbing sheet 901 rotates synchronously under the drive of the cooling 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 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 crystals are in a state of motion. The heat absorbing sheet 901 can transfer heat and increase the absorption of heat of the potassium nitrate solution by the cooling tube 104. The large load-reducing hole 904 and the small load-reducing hole 905 are used for the circulation of the potassium nitrate solution, reducing the resistance of the heat absorbing sheet 901, the side wall scraping strip 902 and the bottom wall scraping strip 903 to rotate, and also play a role in disturbing the potassium nitrate solution. The hollow tube 1101 is relatively light in weight, 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 and accumulates elastic force under the drive of the coil spring connecting seat 1105, and the long elastic piece 105 and the short elastic piece 1103 are both 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. Driven by the passive coil spring 12, the hollow tube 1101 rotates in the opposite direction, and the inner contact piece 1102 and the outer contact piece 106 that are initially in contact will swing back and forth, generating a vibration force. Under the action of the counterweight block 1104, the inertia of the passive component 11 rotating in the opposite direction is greater, and therefore, it will overcome the resistance of the potassium nitrate solution and the outer contact piece 106, rotate in the opposite direction for a distance, and contact and collide 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. The steam outlet pipe is used to discharge the steam generated by the vaporization of water in the potassium nitrate solution under vacuum state, 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.

[0028] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that 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; 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; 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: 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 to 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).

6. A vacuum cooling crystallization device for potassium nitrate production according to claim 5, 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.

7. A vacuum cooling crystallization device for potassium nitrate production according to claim 1, characterized in that: 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.

8. 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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