A high temperature molten urea pump

Abstract

The invention discloses a high-temperature molten urea pump, which relates to the technical field of molten urea pumps. The pump comprises a molten pump body, a urea inlet pipe connected to one side of the molten pump body, and an impeller body rotatably connected in the molten pump body. The pump comprises a cooling component connected to the molten pump body. The cooling component comprises a coolant delivery channel provided in the impeller body for circulating coolant. The two ends of the impeller body are rotatably connected with a first rotary joint and a second rotary joint respectively. The preheating component is connected to the molten pump body. The temperature control and regulating component provided in the invention realizes continuous cooling of the coolant in the coolant storage tank, and heats the solution in the preheating solution storage tank to preheat the urea solution. In addition, the thermistor can sense the inlet temperature of the impeller body, so that the first conductor and the second conductor can provide accurate heating and cooling effects according to different urea temperatures, thereby realizing intelligent and controllable temperature regulation.

Description

Technical Field

[0001] The invention relates to the technical field of molten urea pumps, in particular to a high-temperature molten urea pump. Background Art

[0002] With the continuous development of the chemical industry, especially the fertilizer industry, the performance and stability of urea melt pumps, as key equipment in the fertilizer production process, have a vital impact on the operating efficiency and product quality of the entire production line. In the process of conveying high-temperature molten urea, the high temperature resistance, corrosion resistance and crystallization resistance of the molten urea pump have become important indicators to measure its performance. The temperature of the medium is allowed to be -20 to 250°C. With the continuous operation of the high-temperature urea melt pump, such a high medium temperature is continuously transmitted through the pump cover and connecting bolts, resulting in an increase in the bearing temperature in the pump bearing box, resulting in damage, which affects the normal operation of the pump. Therefore, a cooling mechanism is often set on the pump body to cool the pump body.

[0003] For example, an existing patent (publication number: CN216447186U) discloses a corrosion-resistant and wear-resistant high-temperature urea melting pump bearing box cooling structure, including a bearing box, a front cavity is formed between the end face of the bearing box and the front sealing plate; a rear cavity is formed between the outer circle of the bearing box and the rear sealing sleeve; the front cavity is connected to a cooling water inlet; and the rear cavity is connected to a cooling water outlet. Since the front cavity is formed between the end face of the bearing box and the front sealing plate, the rear cavity is formed between the outer circle of the bearing box and the rear sealing sleeve, the front cavity is connected to a cooling water inlet, and the rear cavity is connected to a cooling water outlet, the technical problem of poor cooling effect of the bearing box in the prior art is effectively solved, and then the contact between the cooling water and the bearing box is achieved, and the high temperature continuously transmitted from the molten state of the high-temperature urea and the heat generated by the bearing operating oil lubrication are conducted, thereby greatly reducing the temperature of the bearing box and keeping the operating temperature of the bearing within a reasonable temperature range;

[0004] During use of the above device, the cooling water circulates in the two cavities by opening a front cavity and a rear cavity in the pump body, thereby cooling the urea pump. However, during the cooling process, the side close to the cavity often has a better cooling effect due to its shorter contact distance with the coolant, while the side far from the cavity has a poorer cooling effect due to its longer contact distance with the coolant. The side close to the cavity has a better cooling effect, which will reduce the temperature of the urea solution near it. When the temperature of the urea solution is reduced, it will cause crystallization. As the use time increases, more crystals are likely to adhere to the pump body, blocking the pump body and affecting normal transportation. Summary of the invention

[0005] The object of the present invention is to provide a high-temperature molten urea pump to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention provides a high-temperature molten urea pump, comprising a molten pump body, a urea liquid inlet pipe connected to one side of the molten pump body, and an impeller body rotatably connected to the molten pump body.

[0007] The cooling assembly comprises a cooling component connected to the melting pump body, wherein the cooling component comprises a cooling liquid delivery channel provided in the impeller body for circulating the cooling liquid, and the two ends of the impeller body are respectively rotatably connected with a first rotating joint and a second rotating joint;

[0008] A preheating assembly is connected to the melting pump body, wherein the preheating assembly includes a second circulation pipe wound around the urea liquid inlet pipe;

[0009] A temperature control and adjustment component is arranged between the cooling component and the preheating component. The temperature control and adjustment component includes a first conductor and a second conductor which are respectively arranged on the cooling component and the preheating component and have energy level differences. The first conductor and the second conductor are used for absorbing heat and conducting heat, respectively. A thermistor is also arranged on the melting pump body. The thermistor is connected in series with the first conductor and the second conductor.

[0010] Furthermore, the cooling assembly also includes a coolant storage tank connected to the melting pump body, the coolant storage tank is connected to a first water pump, one side of the first water pump is connected to a first circulation pipe for conveying coolant, the other end of the first circulation pipe is connected to a first rotary joint, the coolant storage tank is connected to a short pipe, and the other end of the short pipe is connected to a second rotary joint.

[0011] Furthermore, the preheating component also includes a preheating solution storage tank connected to the melting pump body, the preheating solution storage tank is connected to a second water pump, one end of the second circulation pipe is connected to the water outlet end of the second water pump, and the other end of the second circulation pipe is connected to the preheating solution storage tank.

[0012] Furthermore, a servo motor is provided on one side of the melting pump body, a driving end of the servo motor is connected to a driving gear, the impeller body is connected to a driven gear, and the driving gear and the driven gear are meshed with each other.

[0013] Furthermore, a stirring assembly is provided in both the coolant storage tank and the preheating solution storage tank, and the stirring assembly includes a rotatably connected installation shaft, and a driving fan blade is connected to the installation shaft. The driving fan blade corresponds to the water inlet of the coolant storage tank and the preheating solution storage tank, and the installation shaft is connected to a plurality of symmetrically arranged stirring blades.

[0014] Furthermore, the number of the installation shafts is two, and each of the two installation shafts is connected with a synchronous wheel, and a synchronous belt is transmission-connected between the two synchronous wheels.

[0015] Furthermore, a waste heat recovery component is also provided on the melting pump body, which includes a sealing frame connected to the melting pump body, a mounting frame is connected inside the sealing frame, a cooling fan is connected to the mounting frame, and one end of the second circulation pipe passes through the sealing frame.

[0016] Furthermore, one side of the sealing frame is connected to a filter element, and the filter element includes two rotatable filter plates.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. By opening a coolant delivery channel in the impeller body, the impeller body is cooled and protected. At the same time, the impeller body can stir and deliver urea solution during rotation, so that the solution temperature is evenly distributed, avoiding the risk of urea crystallization, ensuring the stable operation of the impeller body, and improving the overall performance. This setting solves the problem of urea crystallization that may occur in the melt pump body and improves the working efficiency and reliability of the urea pump;

[0019] 2. The preheating component can be used to preheat the urea solution to ensure that it reaches a suitable temperature before entering the melt pump body to avoid crystallization during the cooling process. This setting helps to reduce temperature fluctuations, further reduce the risk of crystallization, and ensure the stable operation of the melt pump body;

[0020] 3. By utilizing the Peltier effect, the temperature control and adjustment component is set to achieve continuous cooling of the coolant in the coolant storage tank, and at the same time heat the solution in the preheating solution storage tank to preheat the urea solution. In addition, the thermistor can sense the liquid inlet temperature of the impeller body, so that the first conductor and the second conductor can provide precise heating and cooling effects according to different urea temperatures, thereby realizing intelligent and controllable temperature adjustment. This setting improves energy utilization efficiency and ensures stable operation and high efficiency performance of the urea solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 is a side view of the present invention;

[0023] Figure 3 It is a schematic diagram of the internal structure of the melting pump body in the present invention;

[0024] Figure 4 It is a schematic diagram of the connection structure of the waste heat recovery component in the present invention;

[0025] Figure 5 It is a schematic diagram of the connection structure of the preheating component in the present invention;

[0026] Figure 6 Schematic diagram of the connection structure between the second circulation pipe and the urea liquid inlet pipe in the present invention;

[0027] Figure 7 It is a schematic diagram of the connection structure between the driving gear and the driven gear in the present invention;

[0028] Figure 8 It is a schematic diagram of the connection structure of the stirring assembly in the present invention;

[0029] Fig. 9 For the present invention Figure 2 A magnified view of the structure at center.

[0030] In the figure: 1, melt pump body; 2, urea inlet pipe; 3, impeller body; 400, cooling assembly; 401, coolant storage tank; 402, first water pump; 403, first circulation pipe; 404, first rotary joint; 405, second rotary joint; 500, temperature control adjustment assembly; 501, first conductor; 502, second conductor; 503, thermistor; 600, preheating assembly; 601, preheating solution storage tank; 60 2. Second water pump; 603. Second circulation pipe; 7. Servo motor; 8. Driving gear; 9. Driven gear; 1000. Stirring assembly; 1001. Mounting shaft; 1002. Driving fan blade; 1003. Synchronous wheel; 1004. Synchronous belt; 1005. Stirring blade; 1100. Waste heat recovery assembly; 1101. Sealing frame; 1102. Mounting frame; 1103. Cooling fan; 12. Filter element; 13. Mounting plate. DETAILED DESCRIPTION

[0031] 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.

[0032] See also Figure 1-9 The present invention provides a technical solution: comprising a melt pump body 1, a urea liquid inlet pipe 2 connected to one side of the melt pump body 1, and an impeller body 3 rotatably connected to the melt pump body 1;

[0033] refer to Figures 1 to 5, including a cooling component 400, connected to the melting pump body 1, the cooling component 400 includes a cooling liquid delivery channel opened in the impeller body 3 for circulating the cooling liquid, and the two ends of the impeller body 3 are respectively rotatably connected with a first rotary joint 404 and a second rotary joint 405; a preheating component 600, connected to the melting pump body 1, the preheating component 600 includes a second circulation pipe 603 wound around the urea inlet pipe 2; a temperature control and adjustment component 500, arranged between the cooling component 400 and the preheating component 600, the temperature control and adjustment component 500 includes a first conductor 501 and a second conductor 502 respectively arranged on the cooling component 400 and the preheating component 600 and having energy level differences, the first conductor 501 and the second conductor 502 are used for heat absorption and heat conduction, respectively, and a thermistor 503 is also arranged on the melting pump body 1, and the thermistor 503 is connected in series with the first conductor 501 and the second conductor 502;

[0034] It should be noted that the first conductor 501 and the second conductor 502 are made of materials with different energy levels, electrical conductivity and thermal conductivity. Metal conductors such as copper and silver, composite materials or new materials such as silver sulfide and yttrium oxide can be selected. The present application preferably uses N-type semiconductors and P-type semiconductors. The first conductor 501, the second conductor 502 and the thermistor 503 are interconnected through a circuit. The first rotary joint 404 and the second rotary joint 405 are a pipe connection device, which is characterized in that the connected pipes can rotate relative to each other. The bottom of the melting pump body 1 is connected to a mounting plate 13, and a plurality of threaded holes are provided on the mounting plate 13.

[0035] Preferably, one side of the urea inlet pipe 2 can be connected to a heat conductive block, and one end of the heat conductive block is connected to the thermistor 503, so that the thermistor 503 can perform more accurate temperature sensing.

[0036] In a specific implementation, the coolant can flow into the impeller body 3 through the coolant delivery channel opened in the impeller body 3, so as to cool the impeller body 3. While protecting the impeller body 3, the impeller body 3 can also stir and deliver the urea during the delivery of urea during the rotation process, so that the temperature distribution of the urea solution in the melt pump body 1 is uniform, and the situation that the uneven temperature distribution easily leads to the crystallization of the urea solution is avoided, thereby ensuring the continuous and stable operation of the impeller body 3 and improving the overall performance of the melt pump body 1;

[0037] The preheating assembly 600 can preheat the solution introduced into the impeller body 3, and raise the temperature of the urea solution in advance, so as to avoid the situation that the urea solution has a low temperature and crystallizes during the subsequent cooling of the impeller body 3 and the melting pump body 1. This arrangement ensures that the urea solution reaches a suitable working temperature before entering the melting pump body 1. This helps to reduce the temperature fluctuation of the urea solution in the melting pump body 1, and further reduces the risk of crystallization;

[0038] The temperature control and adjustment component 500 uses the Peltier effect to energize the first conductor 501 and the second conductor 502 so that the end of the first conductor 501 in contact with the coolant storage tank 401 absorbs heat, that is, the coolant in the coolant storage tank 401 is continuously cooled to ensure the cooling effect of the solution entering the impeller body 3. The second conductor 502 also emits heat to heat the solution in the preheating solution storage tank 601 while the first conductor 501 absorbs heat from the coolant storage tank 401. The heated solution is convenient for heating the solution entering the melting pump body 1, thereby preheating the urea solution. At the same time, the thermistor 503 can sense the temperature of the impeller body 3 inlet liquid, so that the first conductor 501 and the second conductor 502 can provide different heating and cooling effects according to the different temperatures of the introduced urea, thereby realizing precise temperature control.

[0039] In order to facilitate the cooling of the impeller body 3 and the melting pump body 1 by the impeller body 3 and extend the service life of the melting pump body 1, please refer to Figures 1 to 3 The cooling assembly 400 further includes a cooling liquid storage tank 401 connected to the melting pump body 1, a first water pump 402 is connected to the cooling liquid storage tank 401, a first circulation pipe 403 for conveying cooling liquid is connected to one side of the first water pump 402, the other end of the first circulation pipe 403 is connected to the first rotating joint 404, a short pipe is connected to the cooling liquid storage tank 401, and the other end of the short pipe is connected to the second rotating joint 405;

[0040] During specific implementation, the coolant storage tank 401 is used to store coolant, the first water pump 402 is used to transport the coolant, the first circulation pipe 403 and the short pipe can be used to transport the solution so that the cold drink solution can circulate between the impeller body 3 and the melting pump body 1, thereby improving the heat exchange efficiency, and then the first conductor 501 can be used to cool the coolant storage tank 401 to improve the cooling effect of the cooling solution.

[0041] In order to facilitate the preheating of the urea solution entering the melt pump body 1, it is necessary to further disclose the structure of the preheating component 600. Figure 5 to Figure 6 The preheating assembly 600 further includes a preheating solution storage tank 601 connected to the melting pump body 1, the preheating solution storage tank 601 is connected to a second water pump 602, one end of a second circulation pipe 603 is connected to a water outlet end of the second water pump 602, and the other end of the second circulation pipe 603 is connected to the preheating solution storage tank 601;

[0042] During specific implementation, a preheating solution storage box 601 is provided to store the preheating solution, and a second water pump 602 is provided to extract the solution in the preheating solution storage box 601 and transport it through a second circulation pipe 603. The second circulation pipe 603 is serpentinely wound around the urea inlet pipe 2, which is convenient for preheating the urea solution, thereby ensuring that the urea solution reaches a suitable working temperature before entering the melt pump body 1, which helps to reduce the temperature fluctuation of the urea solution in the melt pump body 1 and further reduce the risk of crystallization.

[0043] In order to facilitate the driving of the impeller body 3 to rotate while avoiding affecting the flow of the coolant, please refer to Figure 2 and Figure 8 A servo motor 7 is arranged on one side of the melting pump body 1, and a driving gear 8 is connected to the driving end of the servo motor 7, and a driven gear 9 is connected to the impeller body 3, and the driving gear 8 and the driven gear 9 are meshed with each other; the arranged servo motor 7 can drive the driving gear 8 to rotate, and the driving gear 8 can drive the driven gear 9 to rotate while rotating, and then the driven gear 9 can drive the impeller body 3 to rotate.

[0044] In order to facilitate the improvement of the uniformity of cooling and heating of the solutions in the coolant storage tank 401 and the preheating solution storage tank 601, a stirring assembly 1000 is provided in the coolant storage tank 401 and the preheating solution storage tank 601. The stirring assembly 1000 includes a rotatably connected mounting shaft 1001, and a driving blade 1002 is connected to the mounting shaft 1001. The driving blade 1002 corresponds to the water inlet of the coolant storage tank 401 and the preheating solution storage tank 601. A plurality of symmetrically arranged stirring blades 1005 are connected to the mounting shaft 1001.

[0045] In specific implementation, when the solution in the coolant storage tank 401 and the preheating solution storage tank 601 refluxes, the driving blades 1002 will be driven to rotate. During the rotation of the driving blades 1002, the mounting shaft 1001 can be driven to rotate. Subsequently, the multiple stirring blades 1005 connected to the mounting shaft 1001 can stir the solution in the coolant storage tank 401 or the preheating solution storage tank 601 to improve the cooling and heating efficiency.

[0046] To improve the mixing efficiency, please continue to refer to Figure 8 There are two mounting shafts 1001, both mounting shafts 1001 are connected with synchronous wheels 1003, and a synchronous belt 1004 is connected between the two synchronous wheels 1003; this arrangement expands the stirring range and improves the stirring efficiency of the solution in the coolant storage tank 401 or the preheating solution storage tank 601.

[0047] To facilitate further utilization of the heat carried by the first circulation pipe 403 during reflux, please refer to Figure 4The melting pump body 1 is also provided with a waste heat recovery component 1100, which includes a sealing frame 1101 connected to the melting pump body 1, a mounting frame 1102 connected to the sealing frame 1101, a cooling fan 1103 connected to the mounting frame 1102, and one end of the second circulation pipe 603 passes through the sealing frame 1101;

[0048] In specific implementation, a sealing frame 1101 is used to seal one end of the first circulation pipe 403 to prevent heat loss during the reflux process, and then the heat dissipation fan 1103 is started to dissipate the heat carried on the first circulation pipe 403 to the preheating solution storage box 601, and the preheating solution storage box 601 is further heated, thereby increasing the heat of the solution stored in the preheating solution storage box 601, and conveniently and quickly preheating the urea solution;

[0049] Please refer to Figure 4 A filter element 12 is connected to one side of the sealing frame 1101, and the filter element 12 includes two rotatable filter plates; the filter element 12 is convenient for filtering dust and impurities in the air, and the two rotatable filter plates are convenient for filtering impurities of different sizes.

[0050] Working principle: The coolant can flow into the impeller through the coolant delivery channel opened in the impeller body 3, so as to cool the impeller body 3. While protecting the impeller body 3, the impeller body 3 can also stir and deliver urea during the process of conveying urea during rotation, so that the temperature distribution of the urea solution in the melt pump body 1 is uniform, avoiding the situation that the uneven temperature distribution easily leads to the crystallization of the urea solution, ensuring the continuous and stable operation of the impeller body 3, and improving the overall performance of the melt pump body 1;

[0051] The preheating assembly 600 can preheat the solution introduced into the impeller body 3, and raise the temperature of the urea solution in advance, so as to avoid the situation that the urea solution has a low temperature and crystallizes during the subsequent cooling of the impeller body 3 and the melting pump body 1. This arrangement ensures that the urea solution reaches a suitable working temperature before entering the melting pump body 1. This helps to reduce the temperature fluctuation of the urea solution in the melting pump body 1, and further reduces the risk of crystallization;

[0052] The temperature control and adjustment component 500 uses the Peltier effect. By energizing the first conductor 501 and the second conductor 502, the end of the first conductor 501 that contacts the coolant storage tank 401 absorbs heat, that is, the coolant in the coolant storage tank 401 is continuously cooled to ensure the cooling effect of the solution entering the impeller body 3. The second conductor 502 also emits heat while the first conductor 501 absorbs heat from the coolant storage tank 401, thereby heating the solution in the preheating solution storage tank 601. The heated solution is convenient for heating the solution entering the melting pump body 1, thereby preheating the urea solution. At the same time, the thermistor 503 can sense the temperature of the inlet liquid of the impeller body 3, so that the first conductor 501 and the second conductor 502 can provide different heating and cooling effects according to the different temperatures of the introduced urea, thereby realizing precise temperature control.

Claims

1. A high-temperature molten urea pump, comprising a molten pump body (1), a urea liquid inlet pipe (2) connected to one side of the molten pump body (1), and an impeller body (3) rotatably connected to the molten pump body (1), characterized in that: The invention comprises a cooling assembly (400) connected to a melting pump body (1), wherein the cooling assembly (400) comprises a cooling liquid delivery channel opened in an impeller body (3) for circulating cooling liquid, and the two ends of the impeller body (3) are respectively rotatably connected to a first rotating joint (404) and a second rotating joint (405); A preheating component (600) is connected to the melting pump body (1), wherein the preheating component (600) includes a second circulation pipe (603) wound around the urea liquid inlet pipe (2); A temperature control and adjustment component (500) is arranged between the cooling component (400) and the preheating component (600), the temperature control and adjustment component (500) comprising a first conductor (501) and a second conductor (502) which are arranged on the cooling component (400) and the preheating component (600) respectively and have different energy levels, the first conductor (501) and the second conductor (502) being used for absorbing heat and conducting heat respectively, and a thermistor (503) is also arranged on the melting pump body (1), and the thermistor (503) is connected in series with the first conductor (501) and the second conductor (502); By energizing the first conductor (501) and the second conductor (502), the end of the first conductor (501) in contact with the coolant storage tank (401) absorbs heat, that is, the coolant in the coolant storage tank (401) is continuously cooled, thereby ensuring the cooling effect of the solution entering the impeller body (3). While the first conductor (501) absorbs heat from the coolant storage tank (401), the second conductor (502) also emits heat to heat the solution in the preheating solution storage tank (601). The heated solution is convenient for heating the solution entering the molten pump body (1). The thermistor (503) can sense the temperature of the inlet liquid of the impeller body (3), so that the first conductor (501) and the second conductor (502) can provide different heating and cooling effects according to the different temperatures of the introduced urea, thereby achieving precise temperature control.

2. A high temperature molten urea pump according to claim 1, characterized in that: The cooling assembly (400) further comprises a cooling liquid storage tank (401) connected to the melting pump body (1); the cooling liquid storage tank (401) is connected to a first water pump (402); one side of the first water pump (402) is connected to a first circulation pipe (403) for conveying cooling liquid; the other end of the first circulation pipe (403) is connected to a first rotating joint (404); the cooling liquid storage tank (401) is connected to a short pipe; the other end of the short pipe is connected to a second rotating joint (405).

3. A high temperature molten urea pump according to claim 2, characterized in that: The preheating component (600) further comprises a preheating solution storage box (601) connected to the melting pump body (1); the preheating solution storage box (601) is connected to a second water pump (602); one end of the second circulation pipe (603) is connected to a water outlet of the second water pump (602); and the other end of the second circulation pipe (603) is connected to the preheating solution storage box (601).

4. A high temperature molten urea pump according to claim 1, characterized in that: A servo motor (7) is provided on one side of the melting pump body (1); a driving end of the servo motor (7) is connected to a driving gear (8); the impeller body (3) is connected to a driven gear (9); and the driving gear (8) and the driven gear (9) are meshed with each other.

5. A high temperature molten urea pump according to claim 3, characterized in that: The cooling liquid storage tank (401) and the preheating solution storage tank (601) are both provided with a stirring assembly (1000), the stirring assembly (1000) comprising a rotatably connected mounting shaft (1001), the mounting shaft (1001) being connected with a driving blade (1002), the driving blade (1002) corresponding to the water inlets of the cooling liquid storage tank (401) and the preheating solution storage tank (601), and the mounting shaft (1001) being connected with a plurality of symmetrically arranged stirring blades (1005).

6. A high temperature molten urea pump according to claim 5, characterized in that: There are two installation shafts (1001), each of the two installation shafts (1001) is connected to a synchronous wheel (1003), and a synchronous belt (1004) is connected between the two synchronous wheels (1003).

7. A high temperature molten urea pump according to claim 1, characterized in that: The melting pump body (1) is also provided with a waste heat recovery component (1100), the waste heat recovery component (1100) comprising a sealing frame (1101) connected to the melting pump body (1), a mounting frame (1102) connected to the sealing frame (1101), a cooling fan (1103) connected to the mounting frame (1102), and one end of the second circulation pipe (603) passes through the sealing frame (1101).

8. A high temperature molten urea pump according to claim 7, characterized in that: One side of the sealing frame (1101) is connected to a filter element (12), and the filter element (12) comprises two rotatable filter plates.

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