A cooling device for urea solution production

Abstract

This invention relates to the field of cooling equipment technology and discloses a cooling device for the production of urea aqueous solution, comprising: a shell-side assembly capable of containing and circulating urea aqueous solution; a tube-side assembly located inside the shell-side assembly, capable of containing and circulating a cooling medium; several cleaning mechanisms capable of cleaning crystals condensed on the surface of the tube-side assembly; a power assembly capable of driving the cleaning mechanisms to clean the crystals condensed on the surface of the tube-side assembly; and a transmission assembly capable of simultaneously applying the power of one power assembly to several cleaning mechanisms. This cooling device for the production of urea aqueous solution, by driving multiple cleaning mechanisms to rotate inside the first shell through the transmission assembly, can create a strong "turbulent flow" in the urea aqueous solution. This turbulence not only effectively breaks the fluid boundary layer and greatly improves heat exchange efficiency, but also eliminates the heat exchange dead zones commonly found in traditional equipment.

Description

Technical Field

[0001] This invention relates to the field of cooling equipment technology, specifically to a cooling device for the production of urea aqueous solution. Background Technology

[0002] Urea aqueous solution (such as automotive urea AdBlue) is a key chemical for controlling nitrogen oxide emissions in diesel engine exhaust. In industrial production processes, urea granules are usually dissolved in preheated deionized water, and then the high-temperature solution is cooled to the temperature range required for constant temperature filling by cooling equipment. Currently, plate heat exchangers or shell-and-tube heat exchangers are commonly used as cooling equipment on production lines.

[0003] However, due to the strong crystallizing properties of urea solution, when the high-temperature saturated solution comes into contact with the cooler heat exchange tube wall, the liquid layer near the wall quickly reaches a supersaturated state and urea crystals precipitate. This easily forms a hard crystalline layer on the metal surface. The presence of this crystalline layer greatly increases thermal resistance, leading to a sharp drop in heat exchange efficiency and even gradually clogging the heat exchange channels, forcing frequent production line shutdowns for cleaning and significantly increasing maintenance costs. To address this wall crystallization problem, existing technologies have proposed some heat exchange devices with self-cleaning functions.

[0004] For example, patent CN114526620B discloses a backflushing shell-and-tube heat exchanger with a cleaning mechanism installed in the middle of the cavity to automatically clean the cavity into which the material enters, based on the temperature and flow rate of the cleaning fluid. Although this solution attempts to solve the problem of time-consuming and labor-intensive cleaning, this method based on backflushing with cleaning fluid often fails to completely remove the hard crystalline layer that has firmly adhered to the heat exchange tube wall. For media such as urea, which is extremely prone to scaling, its physical removal power is clearly insufficient.

[0005] For example, patent CN117516219B discloses a shell-and-tube heat exchanger that uses water flow to drive the fan blades to rotate, which in turn drives the gear ring and the brush ring to rotate. The brush ring cleans the inner wall of the heat exchanger body shell, thereby achieving a cleaning function without disassembly.

[0006] However, when these devices, which rely on conventional mechanical rotating scrapers, are actually used for urea cooling, they have the following problems: First, when the urea crystals on the pipe wall are thick and hard, a simple rotating scraper is easily jammed due to enormous resistance. Once rotation is obstructed, not only can cleaning continue, but the internal motor or transmission components may also stall or even burn out due to excessive torque. Second, the cooling equipment is located in a complex environment filled with urea solution. Existing reset or transmission mechanisms are often directly exposed to the urea solution, making them highly susceptible to urea corrosion or failure due to the infiltration of condensate and crystals caused by temperature differences. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides a cooling device for the production of urea aqueous solution, which can reduce crystal formation on the outer wall of the fifth tube, improve heat exchange efficiency, and extend maintenance time.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a cooling device for the production of urea aqueous solution, comprising: Shell-side components, which can contain and allow flow of urea aqueous solution; Tube-side assembly, which is located inside the shell-side assembly, and the tube-side assembly can accommodate and circulate the cooling medium. Several cleaning mechanisms are available to remove crystals that have condensed on the surface of tube components; The power unit is capable of driving the cleaning mechanism to clean the crystals that have condensed on the surface of the tube assembly; A transmission assembly that can simultaneously apply the power of one power assembly to several cleaning mechanisms.

[0009] Furthermore, it also includes several vibration components that can break up crystals when the crystal-blocking cleaning mechanism cleans the surface of the tube assembly; Several reset mechanisms are provided, which can drive the vibration component to reset after the vibration component breaks the crystal.

[0010] Furthermore, the shell-side assembly includes a first shell, a second shell, and a third shell. The two ends of the first shell are fixedly connected to the second shell and the third shell, respectively. A first tube and a second tube are fixedly connected to the two ends of the first shell near the second shell and the third shell, respectively. A third tube is fixedly connected to the side wall of the second shell, and a fourth tube is fixedly connected to the side wall of the third shell. The tube-side assembly is located inside the first shell, and the third tube, the second shell, the tube-side assembly, the third shell, and the fourth tube are internally connected. The first tube, the first shell, and the second tube are internally connected.

[0011] Furthermore, the tube assembly includes two first plates and a plurality of fifth tubes, the two ends of the plurality of fifth tubes being fixedly connected to the two first plates respectively, the outer walls of the two first plates being fixedly connected to the inner walls of the two ends of the first housing respectively, and the second housing, the plurality of fifth tubes and the third housing being internally connected.

[0012] Furthermore, the cleaning mechanism includes a rotating assembly, several first spiral members, two second plates, and several second spiral members. The lower end of the rotating assembly is connected to the reset mechanism, the upper end of the rotating assembly is fixedly connected to the bottom surface of the first second plate, the upper surface of the first second plate is fixedly connected to the lower ends of several first spiral members, the upper ends of several first spiral members are fixedly connected to the bottom surface of the second second plate, the upper surface of the second second plate is connected to the vibration assembly, the outer sidewalls of several second spiral members are fixedly connected to the inner sidewalls of several first spiral members, and the inner sidewalls of several second spiral members abut against the outer walls of several fifth tubes. The rotating assembly includes a third ring, a fourth ring, and a fifth ring. The upper end of the third ring is fixedly connected to the bottom surface of the first second plate, the lower end of the third ring is fixedly connected to the upper end of the fourth ring, the outer wall of the fourth ring is rotatably connected to the inner wall of the fifth ring through a first sealed bearing, and the lower end of the fifth ring is connected to a reset mechanism. Several second spiral components are fixedly connected to the upper and lower sides of the side near the fifth tube body with third spiral components. The first and third spiral components are made of hard metal, while the second spiral components are made of rubber.

[0013] Furthermore, a number of second rods are fixedly connected between the two second plates, and the sidewalls of the second rods are all fixedly connected to the first spiral component.

[0014] Furthermore, the power assembly includes a motor and a first rod. The outer wall of the motor is fixedly connected to the upper surface of the second housing. The output shaft of the motor is fixedly connected to the upper end of the first rod. The other end of the first rod passes through the second housing and the first plate located at the upper end to the interior of the first housing and is connected to the transmission assembly. The penetration points of the first rod with the second housing and the first plate are rotatably connected by a second sealed bearing.

[0015] Furthermore, the transmission assembly includes a first gear, several second gears, several third gears, and several third rods. The first gear is sleeved and fixedly connected to the outer wall of one end of the first rod located inside the first housing. The upper ends of the several third rods are all fixedly connected to the first plate located at the upper end. The outer walls of the several third rods are rotatably connected to the several second gears through several third sealed bearings. The several third gears are rotatably connected to the upper ends of several fifth tubes through several fourth sealed bearings. The several third gears are evenly divided into multiple groups, and the several third gears in the same group mesh with each other. The number of several second gears is the same as the number of groups of third gears, and the several second gears are staggered with the multiple groups of third gears. The second gears mesh with the adjacent third gears, and one of the second gears also meshes with the first gear.

[0016] Furthermore, the number of vibration components is the same as the number of third gears. The vibration components include a first ring body and a second ring body. The upper surface of the second ring body is fixedly connected to the bottom surface of the third gear, and the bottom surface of the first ring body is fixedly connected to the upper surface of the second plate body. Several misalignment openings are provided on the adjacent side of the first ring body and the second ring body, and the misalignment openings of the first ring body and the second ring body match.

[0017] Furthermore, the number of reset mechanisms is the same as the number of vibration components. The reset mechanism includes a blocking component and a spring. The upper end of the blocking component is connected to the bottom surface of the fifth ring body, the lower end of the blocking component is connected to the upper surface of the first plate body located at the lower end, and the spring is located inside the blocking component. The shielding assembly includes a sixth ring, a first accordion cover, a seventh ring, and a second accordion cover. The upper surface of the sixth ring is fixedly connected to the bottom surface of the fifth ring. The bottom surface of the sixth ring is fixedly connected to the upper ends of both the first and second accordion covers. The lower ends of both the first and second accordion covers are fixedly connected to the upper surface of the seventh ring. The bottom surface of the seventh ring is fixedly connected to the upper surface of the first plate located at the lower end. The first and second accordion covers are arranged in concentric circles, and a cavity is formed between them. The second accordion cover is an inner circle. A spring is located in the cavity. The upper and lower ends of the spring are fixedly connected to the sixth and seventh rings, respectively. There are gaps between the sixth ring, the second accordion cover, the seventh ring, and the fifth tube. The inner walls of both the first and second accordion covers are fixedly connected with several steel wire rings, which are parallel vertically to each other.

[0018] Compared with the prior art, the present invention has the following beneficial effects: This cooling equipment for producing urea aqueous solution drives multiple cleaning mechanisms to rotate inside the first shell through a transmission component, which can create strong "turbulence" in the urea aqueous solution. This turbulence not only effectively breaks the fluid boundary layer and greatly improves the heat exchange efficiency, but also eliminates the heat exchange dead zones that are common in traditional equipment. In this cooling equipment for the production of urea aqueous solution, the second spiral component made of rubber rotates close to the outer wall of the fifth tube, which can continuously scrape off the initial tiny crystals, ensuring that the heat exchange surface remains clean and maintaining an extremely high design heat transfer coefficient. When the equipment encounters severe crystallization and rotation is obstructed, the vibration component uses the thrust generated by the misalignment port to guide the cleaning mechanism to produce axial displacement. The third spiral component made of metal then performs high-frequency continuous impact and removal of the hard crystals, similar to an "impact screwdriver", which physically solves the problem of mechanism jamming caused by hard crystals. The cooling equipment for the production of urea aqueous solution has a misaligned design of the vibration components, which means that the motor does not need a hard load when the resistance is too high. By converting the rotational torque into axial impact energy, it effectively protects the transmission gears and motor from being burned or damaged, thus improving the structural safety of the equipment. The cooling equipment for the production of urea aqueous solution uses a bellows cover to form a sealed cavity for the reset mechanism, which is filled with nitrogen gas. This effectively isolates the urea solution from corroding the springs and eliminates the risk of condensation caused by temperature differences. The bellows cover is reinforced with steel wire rings to maintain structural stability when immersed in a hydraulic solution, without interfering with the normal reset action of the internal springs, thus ensuring the long-term reliability of the self-cleaning function. This cooling equipment for urea solution production installs the power and transmission components in the "high-temperature zone" at the top of the heat exchanger. Since the hot urea solution that just enters from the top has the highest temperature and is not prone to crystallization, this layout minimizes the possibility of complex and precision mechanisms (such as gear sets) being blocked or jammed by crystallization, significantly extending the equipment's operating cycle. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall appearance of the present invention; Figure 2 This is a schematic diagram of the overall appearance of the invention from another perspective; Figure 3 This is a schematic diagram of the internal structure of the shell-side assembly of the present invention; Figure 4 This is a three-dimensional cross-sectional view of the shell-side assembly of the present invention; Figure 5 This is a detailed connection diagram of the power assembly, transmission assembly, and vibration assembly of the present invention; Figure 6 This is a schematic diagram showing further connections of components such as the power assembly and transmission assembly of the present invention; Figure 7 This is an exploded view of the cleaning mechanism, vibration assembly, and reset mechanism of the present invention. Figure 8 For the present invention Figure 7 Enlarged view of point A in the middle; Figure 9 For the present invention Figure 7 A schematic diagram of the various components from another perspective; Figure 10 This is a detailed connection diagram of the fifth ring body and the reset mechanism of the present invention; Figure 11 For the present invention Figure 10 Explosion diagram of each component.

[0020] In the picture: 1. Shell-side assembly; 11. First shell; 111. First tube; 112. Second tube; 12. Second shell; 121. Third tube; 13. Third shell; 131. Fourth tube; 2. Power assembly; 21. Motor; 22. First rod; 3. Tube assembly; 31. First plate; 32. Fifth tube; 4. Cleaning mechanism; 41. First spiral component; 42. Second plate; 43. Second spiral component; 431. Third spiral component; 44. Rotating assembly; 441. Third ring body; 442. Fourth ring body; 443. Fifth ring body; 5. The second rod; 6. Transmission assembly; 61. First gear; 62. Second gear; 63. Third gear; 64. Third rod; 7. Vibration assembly; 71. First ring body; 711. Misalignment opening; 72. Second ring body; 8. Reset mechanism; 81. Shielding assembly; 811. Sixth ring body; 812. First accordion cover; 813. Seventh ring body; 814. Second accordion cover; 815. Steel wire ring; 82. Spring; 801. Cavity. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0022] Please see Figures 1-11 A cooling device for producing urea aqueous solution, comprising: Shell-side assembly 1, which is capable of containing and circulating an aqueous urea solution; Tube assembly 3 is located inside shell assembly 1, and the tube assembly 3 is capable of containing and circulating cooling medium. Several cleaning mechanisms 4 are capable of cleaning crystals that have condensed on the surface of the tube assembly 3; Power component 2, which drives cleaning mechanism 4 to clean the crystals condensed on the surface of tube assembly 3; The transmission component 6 is capable of simultaneously applying the power of one power component 2 to several cleaning mechanisms 4; It also includes several vibration components 7, which can break up the crystals when the crystal blocking cleaning mechanism 4 cleans the surface of the tube assembly 3; Several reset mechanisms 8 are provided, which can drive the vibration component 7 to reset after the vibration component 7 breaks the crystal.

[0023] Furthermore, in order to enable the shell-side assembly 1 to contain and circulate urea aqueous solution, as a preferred embodiment of the present invention, the shell-side assembly 1 includes a first shell 11, a second shell 12, and a third shell 13. The two ends of the first shell 11 are fixedly connected to the second shell 12 and the third shell 13, respectively. A first tube 111 and a second tube 112 are fixedly connected to the two ends of the first shell 11 near the second shell 12 and the third shell 13, respectively. A third tube 121 is fixedly connected to the side wall of the second shell 12, and a fourth tube 131 is fixedly connected to the side wall of the third shell 13. The tube-side assembly 3 is located inside the first shell 11, and the third tube 121, the second shell 12, the tube-side assembly 3, the third shell 13, and the fourth tube 131 are internally connected. The first tube 111, the first shell 11, and the second tube 112 are internally connected. Specifically, such as Figure 3 and Figure 4 As shown, during use, the urea aqueous solution that needs to be cooled during the production process is introduced into the first shell 11 through the first tube 111 and then flows out through the second tube 112 of the first shell 11. This allows the urea aqueous solution to come into contact with the tube assembly 3 located inside the first shell 11 during its flow inside the first shell 11, thereby achieving heat exchange and cooling.

[0024] Furthermore, in order to enable the cooling medium to be accommodated and circulated inside the tube assembly 3, as a preferred embodiment of the present invention, the tube assembly 3 includes two first plates 31 and a plurality of fifth tubes 32, the two ends of the plurality of fifth tubes 32 are respectively fixedly connected to the two first plates 31, the outer walls of the two first plates 31 are respectively fixedly connected to the inner walls of the two ends of the first housing 11, and the second housing 12, the plurality of fifth tubes 32 and the third housing 13 are internally connected; Specifically, such as Figure 3 and Figure 4 As shown, during use, the low-temperature medium is introduced into the third housing 13 through the fourth tube 131, and then the medium enters several fifth tubes 32 from the third housing 13, and finally rises from the inside of the fifth tubes 32 into the second housing 12, and finally flows out from the third tube 121 of the second housing 12. When the low-temperature medium flows inside the fifth tube 32, the wall of the low-temperature fifth tube 32 comes into contact with the high-temperature urea aqueous solution located in the first shell 11, thereby generating a heat exchange effect and cooling the urea aqueous solution. It is worth noting that the low-temperature medium enters from the third shell 13 located below the first shell 11 and exits from the second shell 12 located above the first shell 11. At the same time, the high-temperature urea aqueous solution is introduced from the first tube 111 above the first shell 11 and flows out from the second tube 112 below the first shell 11. This not only ensures the heat exchange effect, but also reduces the possibility of crystallization because the temperature above the first shell 11 is higher. This reduces the probability of blockage, jamming, and failure of the transmission component 6 located above the first shell 11.

[0025] Furthermore, in order to enable the cleaning mechanism 4 to clean the crystals condensed on the surface of the tube assembly 3, as a preferred embodiment of the present invention, the cleaning mechanism 4 includes a rotating assembly 44, a plurality of first spiral members 41, two second plates 42 and a plurality of second spiral members 43. The lower end of the rotating assembly 44 is connected to the reset mechanism 8, the upper end of the rotating assembly 44 is fixedly connected to the bottom surface of the first second plate 42, the upper surface of the first second plate 42 is fixedly connected to the lower ends of the plurality of first spiral members 41, the upper ends of the plurality of first spiral members 41 are fixedly connected to the bottom surface of the second second plate 42, the upper surface of the second second plate 42 is connected to the vibration assembly 7, the outer sidewalls of the plurality of second spiral members 43 are respectively fixedly connected to the inner sidewalls of the plurality of first spiral members 41, and the inner sidewalls of the plurality of second spiral members 43 abut against the outer walls of the plurality of fifth tubes 32. More specifically, the rotating assembly 44 includes a third ring body 441, a fourth ring body 442, and a fifth ring body 443. The upper end of the third ring body 441 is fixedly connected to the bottom surface of the first second plate body 42, the lower end of the third ring body 441 is fixedly connected to the upper end of the fourth ring body 442, the outer wall of the fourth ring body 442 is rotatably connected to the inner wall of the fifth ring body 443 through a first sealed bearing, and the lower end of the fifth ring body 443 is connected to the reset mechanism 8. More specifically, several second spiral components 43 are fixedly connected to the upper and lower sides of the side near the fifth tube 32 with third spiral components 431. The first spiral component 41 and the third spiral component 431 are both hard metal, and the second spiral component 43 is rubber. Specifically, such as Figure 5 as well as Figures 7-9 As shown, during normal operation, in order to avoid crystallization after the urea solution comes into contact with the low-temperature fifth tube 32, the power assembly 2 is turned on simultaneously when the shell-side assembly 1 and the tube-side assembly 3 are used to cool the urea solution. The power assembly 2 can then rotate the second plate 42 located above through the transmission assembly 6 and the vibration assembly 7. The rotation of the second plate 42 can simultaneously rotate the first spiral component 41, the second spiral component 43 and the third spiral component 431 together around the fifth tube 32 as the axis. At this time, because there is no crystallization or the degree of crystallization on the surface of the fifth tube 32, the rubber second spiral component 43 on the surface of the fifth tube 32 can scrape off the small amount or slight crystallization on the surface of the fifth tube 32, thereby ensuring the cleanliness of the surface of the fifth tube 32 and thus ensuring the heat exchange effect. Furthermore, due to the function of the transmission assembly 6, the rotation directions of the first spiral 41, the second spiral 43, and the third spiral 431 are different (the specific different methods will be explained in detail later). Therefore, "turbulence" can also be formed inside the first shell 11, thereby reducing the heat exchange "dead angle". The crystals that were scraped off due to the rotation of the first spiral 41, the second spiral 43, and the third spiral 431 may rise to the "high temperature zone" above the first shell 11 and melt under the action of turbulence. They may also be discharged from the first shell 11 through the second tube 112 along with the cooled urea aqueous solution. The probability of repeated crystallization on the surface of the fifth tube 32 is greatly reduced. In addition, when the crystallization is severe, the second spiral component 43 cannot rotate smoothly on the surface of the fifth tube 32. In this case, the vibration component 7 can move the first spiral component 41, the second spiral component 43 and the third spiral component 431 up and down along the axial direction of the fifth tube 32, thereby causing a continuous impact on the crystallization through the hard metal first spiral component 41 and the third spiral component 431, similar to an "impact screwdriver" (the specific method will be explained in detail later), thereby breaking the hard crystallization.

[0026] Furthermore, in order to ensure the hardness and support stability of the first spiral components 41, as a preferred embodiment of the present invention, a number of second rods 5 are fixedly connected between the two second plates 42, and the sidewalls of the number of second rods 5 are all fixedly connected to the first spiral components 41. Specifically, such as Figures 7-9 As shown, by providing several second rods 5 outside the first spiral member 41, the first spiral member 41 can be supported, and there is a large gap between the first spiral member 41 and the second rods 5, which does not affect the heat exchange between the fifth tube 32 and the urea aqueous solution.

[0027] Furthermore, in order to enable the power assembly 2 to drive the cleaning mechanism 4 to clean the crystals condensed on the surface of the tube assembly 3, as a preferred embodiment of the present invention, the power assembly 2 includes a motor 21 and a first rod 22. The outer wall of the motor 21 is fixedly connected to the upper surface of the second housing 12, and the output shaft of the motor 21 is fixedly connected to the upper end of the first rod 22. The other end of the first rod 22 passes through the second housing 12 and the first plate 31 located at the upper end to the interior of the first housing 11 and is connected to the transmission assembly 6. The penetration points of the first rod 22 with the second housing 12 and the first plate 31 are rotatably connected by a second sealed bearing. Specifically, such as Figure 3 , Figure 5 and Figure 6 As shown, when in use, the motor 21 is turned on, and the output shaft of the motor 21 drives the first rod 22 to rotate. Then the first rod 22 drives the transmission component 6 connected to it to rotate, thereby driving the rotation of subsequent components such as the vibration component 7 and the cleaning mechanism 4.

[0028] Furthermore, in order to enable the transmission assembly 6 to simultaneously apply the power of one power assembly 2 to several cleaning mechanisms 4, as a preferred embodiment of the present invention, the transmission assembly 6 includes a first gear 61, several second gears 62, several third gears 63, and several third rods 64. The first gear 61 is sleeved and fixedly connected to the outer wall of one end of the first rod 22 located inside the first housing 11. The upper ends of several third rods 64 are all fixedly connected to the first plate 31 located at the upper end. The outer walls of several third rods 64 are rotatably connected to several second gears 62 respectively through several third sealed bearings. Several third gears 63 are rotatably connected to the upper ends of several fifth tubes 32 respectively through several fourth sealed bearings. Several third gears 63 are evenly divided into multiple groups. Several third gears 63 in the same group mesh with each other. The number of several second gears 62 is the same as the number of groups of third gears 63. Several second gears 62 are staggered with multiple groups of third gears 63. The second gears 62 mesh with adjacent third gears 63. One of the second gears 62 also meshes with the first gear 61. First of all, it should be noted that: because the rotation direction is clockwise and counterclockwise alternates when the gears mesh, in order to avoid the third gear 63 in the same group from colliding, the number of third gears 63 in each group must be even. The specific number is not limited and is based on the actual distribution of the fifth tube 32. Specifically, such as Figure 3 , Figure 5 and Figure 6As shown, when in use, the first rod 22 rotates, causing the first gear 61 to rotate. Then, the first gear 61 rotates, causing the first second gear 62 connected to it to rotate. Then, the first second gear 62 can rotate one of the third gears 63 in the first group of third gears 63. Since the several third gears 63 in the same group mesh with each other, when the first third gear 63 rotates, the several third gears 63 in the same group will all rotate together. Furthermore, when the first third gear 63 rotates, this third gear 63 will drive one of the third gears 63 in the second group to rotate through the second gear 62. Subsequently, all the third gears 63 in the second group will rotate, and so on for the third and fourth groups of third gears 63. This will not be repeated here.

[0029] Furthermore, in order to enable the vibration assembly 7 to break the crystals when the crystal blocking cleaning mechanism 4 cleans the surface of the tube assembly 3, as a preferred embodiment of the present invention, the number of vibration assemblies 7 is the same as the number of third gears 63. The vibration assembly 7 includes a first ring body 71 and a second ring body 72. The upper surface of the second ring body 72 is fixedly connected to the bottom surface of the third gear 63, and the bottom surface of the first ring body 71 is fixedly connected to the upper surface of the second plate 42. A plurality of misaligned openings 711 are provided on the adjacent side of the first ring body 71 and the misaligned openings 711 of the first ring body 71 and the second ring body 72 are matched. Specifically, such as Figure 5 , Figure 7 and Figure 9 As shown, when the second spiral component 43 is blocked from rotating by the hard crystals on the surface of the fifth tube 32 or the rotation resistance increases, the third gear 63 will continue to rotate because it is directly driven by the motor 21, the first gear 61 and the second gear 62. In order to avoid damage to the gears caused by hard crystals, and to reduce the wear (or scratches) of the rubber second spiral component 43 by hard crystals. When the second spiral component 43 encounters significant resistance, the first ring 71, due to the action of the reset mechanism 8, causes the misalignment opening 711 between the first ring 71 and the second ring 72 to misalign. This allows the second ring 72, connected to the third gear 63, to continue rotating with the third gear 63, while the first ring 71, connected to the cleaning mechanism 4, does not rotate. However, due to the thrust of the misalignment opening 711, the first ring 71 descends. Since a metal third spiral component 431 is provided on the lower side of the second spiral component 43, the metal third spiral component 431 can perform a top-to-bottom "shovel" action on the hard crystals on the surface of the fifth tube 32, thereby improving the effect of breaking up the hard crystals. When the misalignment opening 711 of the second ring 72 and the misalignment opening 711 of the first ring 71 move from the highest point to the lowest point, the first ring 71 rises instantly under the action of the reset mechanism 8 (the specific method will be explained in detail later). Then, the first ring 71 and the second ring 72 collide. At this time, the metal third spiral 431 located on the upper side of the second spiral 43 will "scoop" the hard crystal above the second spiral 43, which can also quickly break the hard crystal on the surface of the fifth tube 32 (and even if the first break is not completed, as long as the hard crystal on the surface of the fifth tube 32 still exists, the collision between the first ring 71 and the second ring 72 will continue to occur until the hard crystal is no longer able to hinder the rotation of the second spiral 43).

[0030] Furthermore, in order to enable the reset mechanism 8 to drive the vibration component 7 to reset after the vibration component 7 breaks the crystal, as a preferred embodiment of the present invention, the number of reset mechanisms 8 is the same as the number of vibration components 7. The reset mechanism 8 includes a shielding component 81 and a spring 82. The upper end of the shielding component 81 is connected to the bottom surface of the fifth ring body 443, the lower end of the shielding component 81 is connected to the upper surface of the first plate body 31 located at the lower end, and the spring 82 is located inside the shielding component 81. More specifically, the shielding assembly 81 includes a sixth ring body 811, a first accordion cover 812, a seventh ring body 813, and a second accordion cover 814. The upper surface of the sixth ring body 811 is fixedly connected to the bottom surface of the fifth ring body 443. The bottom surface of the sixth ring body 811 is fixedly connected to the upper ends of both the first accordion cover 812 and the second accordion cover 814. The lower ends of both the first accordion cover 812 and the second accordion cover 814 are fixedly connected to the upper surface of the seventh ring body 813. The bottom surface of the seventh ring body 813 is fixedly connected to the lower end of the fifth ring body 443. The first plate 31 is fixedly connected to the upper surface. The first bellows cover 812 and the second bellows cover 814 are arranged in concentric circles, and a cavity 801 is formed between the first bellows cover 812 and the second bellows cover 814. The second bellows cover 814 is an inner circle. The spring 82 is located in the cavity 801. The upper and lower ends of the spring 82 are fixedly connected to the sixth ring 811 and the seventh ring 813 respectively. There are gaps between the sixth ring 811, the second bellows cover 814 and the seventh ring 813 and the fifth tube 32. Specifically, such as Figures 9-11 As shown, when the second spiral 43 rotates on the outer wall of the fifth tube 32 and is hindered by hard crystals, the second ring 72 continues to rotate with the third gear 63. However, since the third gear 63 and the second ring 72 cannot move up and down, only the first ring 71 can descend due to the misalignment port 711. When the first ring 71 descends, it pushes the cleaning mechanism 4 down as well. Then, the fifth ring 443 of the cleaning mechanism 4 descends, taking the sixth ring 811 down with it. When the sixth ring 811 descends, it compresses the first bellows cover 812, the second bellows cover 814, and the spring 82 located in the cavity 801. When the misalignment opening 711 of the second ring 72 moves away from the highest point, the first ring 71 rises instantly due to the action of the spring 82. Thus, during the up-and-down movement of the first ring 71, the hard crystals on the surface of the fifth tube 32 can be broken by the metal third spiral component 431. Furthermore, when there is no hard crystallization obstruction on the surface of the fifth tube 32, or when the obstruction force of crystallization is less than the friction force of the misalignment port 711 of the second ring 72 and the thrust of the spring 82, the second spiral component 43 can rotate together with the second ring 72 to achieve the purpose of cleaning crystallization under normal working conditions.

[0031] Furthermore, since the first bellows cover 812 and the second bellows cover 814 are immersed in the urea solution and will be subjected to a large hydraulic pressure, in order to ensure the supporting effect of the first bellows cover 812 and the second bellows cover 814 and to prevent the spring 82 from being jammed, as a preferred embodiment of the present invention, a plurality of steel wire rings 815 are fixedly connected to the inner walls of the first bellows cover 812 and the second bellows cover 814, and the plurality of steel wire rings 815 inside the first bellows cover 812 and the second bellows cover 814 are parallel vertically. Specifically, by setting several steel wire rings 815, the overall support force of the first bellows cover 812 and the second bellows cover 814 can be improved, and the first bellows cover 812 and the second bellows cover 814 can be prevented from being squeezed towards the cavity 801 under hydraulic action, thereby affecting the normal operation of the spring 82. It should be noted that in actual use, nitrogen inert gas can be filled into the cavity 801 in advance. Furthermore, because there are gaps between the sixth ring 811, the second bellows cover 814 and the seventh ring 813 and the fifth tube 32, the probability of condensation inside the cavity 801 is further reduced. Of course, the amount of inert gas should not be too much to avoid hindering the compression of spring 82.

[0032] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cooling device for producing urea aqueous solution, characterized in that, include: Shell-side assembly (1), which is capable of containing and circulating an aqueous urea solution; Tube assembly (3) is located inside shell assembly (1), and the tube assembly (3) is capable of containing and circulating cooling medium. Several cleaning mechanisms (4) are capable of cleaning crystals that have condensed on the surface of the tube assembly (3); The power unit (2) is capable of driving the cleaning mechanism (4) to clean the crystals that have condensed on the surface of the tube assembly (3); The transmission assembly (6) is capable of simultaneously applying the power of a power assembly (2) to several cleaning mechanisms (4); It also includes several vibration components (7) that can break up crystals when the crystal blocking cleaning mechanism (4) cleans the surface of the tube assembly (3); Several reset mechanisms (8) are capable of driving the vibration assembly (7) to reset after the vibration assembly (7) breaks the crystal; The tube assembly (3) includes two first plates (31) and several fifth tubes (32), and the transmission assembly (6) includes a first gear (61), several second gears (62), several third gears (63) and several third rods (64). The cleaning mechanism (4) includes a rotating assembly (44), a plurality of first spiral parts (41), two second plates (42) and a plurality of second spiral parts (43). The lower end of the rotating assembly (44) is connected to the reset mechanism (8). The upper end of the rotating assembly (44) is fixedly connected to the bottom surface of the first second plate (42). The upper surface of the first second plate (42) is fixedly connected to the lower ends of the plurality of first spiral parts (41). The upper ends of the plurality of first spiral parts (41) are fixedly connected to the bottom surface of the second second plate (42). The upper surface of the second second plate (42) is connected to the vibration assembly (7). The outer sidewalls of the plurality of second spiral parts (43) are fixedly connected to the inner sidewalls of the plurality of first spiral parts (41). The inner sidewalls of the plurality of second spiral parts (43) abut against the outer walls of the plurality of fifth tubes (32). The number of vibration components (7) is the same as the number of third gears (63). The vibration components (7) include a first ring body (71) and a second ring body (72). The upper surface of the second ring body (72) is fixedly connected to the bottom surface of the third gear (63). The bottom surface of the first ring body (71) is fixedly connected to the upper surface of the second plate (42). Several misaligned openings (711) are provided on the adjacent side of the first ring body (71) and the second ring body (72). The misaligned openings (711) of the first ring body (71) and the second ring body (72) are matched.

2. The cooling device for urea water solution production according to claim 1, characterized by The shell-side assembly (1) includes a first shell (11), a second shell (12) and a third shell (13). The two ends of the first shell (11) are fixedly connected to the second shell (12) and the third shell (13) respectively. The first shell (11) is fixedly connected to the two ends near the second shell (12) and the third shell (13) respectively. The side wall of the second shell (12) is fixedly connected to the third tube (121). The side wall of the third shell (13) is fixedly connected to the fourth tube (131). The tube-side assembly (3) is located inside the first shell (11), and the third tube (121), the second shell (12), the tube-side assembly (3), the third shell (13) and the fourth tube (131) are internally connected. The first tube (111), the first shell (11) and the second tube (112) are internally connected.

3. The cooling device for urea water solution production according to claim 2, characterized by The two ends of the plurality of fifth tubes (32) are respectively fixedly connected to two first plates (31), the outer walls of the two first plates (31) are respectively fixedly connected to the inner walls of the two ends of the first shell (11), and the second shell (12), the plurality of fifth tubes (32) and the third shell (13) are internally connected.

4. The cooling equipment for producing urea aqueous solution according to claim 3, characterized in that, The rotating assembly (44) includes a third ring body (441), a fourth ring body (442), and a fifth ring body (443). The upper end of the third ring body (441) is fixedly connected to the bottom surface of the first second plate (42), and the lower end of the third ring body (441) is fixedly connected to the upper end of the fourth ring body (442). The outer wall of the fourth ring body (442) is rotatably connected to the inner wall of the fifth ring body (443) through a first sealed bearing. The lower end of the fifth ring body (443) is connected to the reset mechanism (8). Several second spiral components (43) are fixedly connected to a third spiral component (431) on the upper and lower sides of the side near the fifth tube body (32). The first spiral component (41) and the third spiral component (431) are both hard metals, and the second spiral component (43) is rubber.

5. The urea water solution production cooling apparatus according to claim 4, wherein A plurality of second rods (5) are fixedly connected between the two second plates (42), and the sidewalls of the plurality of second rods (5) are fixedly connected to the first spiral member (41).

6. The urea water solution production cooling apparatus according to claim 5, wherein The power assembly (2) includes a motor (21) and a first rod (22). The outer wall of the motor (21) is fixedly connected to the upper surface of the second housing (12). The output shaft of the motor (21) is fixedly connected to the upper end of the first rod (22). The other end of the first rod (22) passes through the second housing (12) and the first plate (31) located at the upper end to the interior of the first housing (11) and is connected to the transmission assembly (6). The first rod (22) is rotatably connected to the second housing (12) and the first plate (31) through the penetration points of the first rod (22) and the second housing (12) and the first plate (31) through the second sealed bearing.

7. The urea water solution production cooling apparatus according to claim 6, wherein The first gear (61) is sleeved and fixedly connected to the outer wall of the first rod (22) located inside the first housing (11). The upper ends of the third rods (64) are fixedly connected to the first plate (31) located at the upper end. The outer walls of the third rods (64) are rotatably connected to the second gears (62) through the third sealing bearings. The third gears (63) are rotatably connected to the upper ends of the fifth tubes (32) through the fourth sealing bearings. The third gears (63) are divided into multiple groups. The third gears (63) in the same group mesh with each other. The number of the second gears (62) is the same as the number of groups of third gears (63). The second gears (62) are staggered with the multiple groups of third gears (63). The second gears (62) mesh with the adjacent third gears (63). One of the second gears (62) also meshes with the first gear (61).

8. The urea water solution production cooling apparatus according to claim 7, wherein The number of reset mechanisms (8) is the same as the number of vibration components (7). The reset mechanism (8) includes a shielding component (81) and a spring (82). The upper end of the shielding component (81) is connected to the bottom surface of the fifth ring body (443), and the lower end of the shielding component (81) is connected to the upper surface of the first plate body (31) located at the lower end. The spring (82) is located inside the shielding component (81). The shielding assembly (81) includes a sixth ring (811), a first accordion cover (812), a seventh ring (813), and a second accordion cover (814). The upper surface of the sixth ring (811) is fixedly connected to the bottom surface of the fifth ring (443). The bottom surface of the sixth ring (811) is fixedly connected to the upper ends of both the first accordion cover (812) and the second accordion cover (814). The lower ends of both the first accordion cover (812) and the second accordion cover (814) are fixedly connected to the upper surface of the seventh ring (813). The bottom surface of the seventh ring (813) is connected to the first plate located at the lower end. The upper surface of the body (31) is fixedly connected. The first accordion cover (812) and the second accordion cover (814) are arranged in concentric circles, and a cavity (801) is formed between the first accordion cover (812) and the second accordion cover (814). The second accordion cover (814) is an inner circle. The spring (82) is located in the cavity (801). The upper and lower ends of the spring (82) are fixedly connected to the sixth ring body (811) and the seventh ring body (813) respectively. There is a gap between the sixth ring body (811), the second accordion cover (814) and the seventh ring body (813) and the fifth tube body (32). The inner walls of the first bellows cover (812) and the second bellows cover (814) are fixedly connected with several steel wire rings (815), and the several steel wire rings (815) inside the first bellows cover (812) and the second bellows cover (814) are parallel vertically.

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