Double-suction self-balancing dynamic seal molten urea pump

Abstract

The invention relates to the technical field of urea pumps, and in particular to a double-suction self-balancing dynamic sealed molten urea pump, comprising a urea pump body and a thermal insulation jacket sleeved on the outside of the urea pump body, wherein a pair of main heating chambers and a pair of auxiliary heating chambers are provided inside the thermal insulation jacket. The invention, through the arrangement of a main regulating mechanism, a main heating chamber and an auxiliary heating chamber, can control the steam passing through the main heating chamber in the thermal insulation jacket to enter from the tail of the auxiliary heating chamber and then be discharged into an exhaust pipe when the temperature of the liquid flowing through the inside of the urea pump body is high, thereby "squeezing out" the latent heat of the steam, resulting in a large degree of supercooling of condensed water, a low boiler return water temperature, and greater energy saving. Moreover, when the temperature of the liquid flowing through the inside of the urea pump body is low, the main upper pipes and the auxiliary upper pipes of the main heating chamber and the auxiliary heating chamber can be fully opened, so that steam can enter from the inlets of the main heating chamber and the auxiliary heating chamber, thereby rapidly heating the liquid in the urea pump, increasing the heat exchange area, and increasing the flexibility of the equipment.

Description

Technical Field

[0001] The invention relates to the technical field of urea pumps, in particular to a double-suction self-balancing dynamic sealing molten urea pump. Background Art

[0002] In large-scale urea plants, the molten urea pump is the "throat" equipment connecting the evaporation section and the prilling tower (or melamine reactor). Its operating characteristics are: medium temperature 132-138°C, solid precipitation point 132.7°C. Once it is too cold, crystallization will block the pipe, and overheating will produce by-products such as biuret and cyanuric acid, affecting product grade. For this reason, the industry generally adopts the "double-suction self-balancing dynamic seal molten urea pump" (hereinafter referred to as double-suction pump). Structurally, this pump type has double-sided impellers, a back-to-back symmetrical arrangement, self-balancing axial force, and the traditional balancing disc is eliminated. In place of a dynamic seal (auxiliary impeller + shutdown seal), the risk of molten urea dilution due to balancing water leakage is completely eliminated. The operating life has been increased from 8 months to more than 36 months. It has become the mainstream configuration for 520,000-800,000 tons / year plants.

[0003] However, the double-suction pump's casing, bearing housing, and inlet and outlet nipples still require continuous heating to prevent the molten urea from stagnating and cooling in the static zone. Therefore, a steam insulation jacket is integrally cast or welded onto the outside of the pump body. Saturated steam of 0.28–0.35 MPa (138–145°C) flows along the jacket's spiral channel, maintaining a metal wall temperature of 135–140°C. Condensate is recovered via a steam trap. This design is reliable under constant load conditions, but exhibits significant flaws in the following scenarios.

[0004] The steam inlet of the jacket on the existing urea pump is only equipped with a manual stop valve or an ordinary temperature control valve, which can only "on / off" or roughly adjust the flow rate. It is unable to change the flow time of the steam in the jacket (i.e. the effective heat exchange path length or residence time) in real time according to the actual measured temperature of the pump body or the medium, resulting in the alternating appearance of "underheated crystallization" and "overheated by-products", which has become a bottleneck restricting long-term and refined production.

[0005] Therefore, a double-suction self-balancing dynamic seal molten urea pump is proposed to solve the above problems. Summary of the Invention

[0006] The purpose of the present invention is to solve the shortcomings of the background technology and propose a double-suction self-balancing dynamic sealed molten urea pump.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is: a double-suction self-balancing dynamic sealed molten urea pump, comprising a urea pump body, and an insulation jacket sleeved on the outside of the urea pump body, a pair of main heating chambers and a pair of auxiliary heating chambers are opened inside the insulation jacket, the inlets of the main heating chamber and the auxiliary heating chamber are fixedly connected with the main upper tube and the auxiliary upper tube respectively, and the outlets of the main heating chamber and the auxiliary heating chamber are fixedly connected with the main lower tube and the auxiliary lower tube respectively, a pair of adjustment frames are provided below the insulation jacket, an exhaust pipe is provided below the adjustment frame, and an adjustment block is provided on the front side of the adjustment frame, a main adjustment mechanism for adjusting the steam entering or discharged from the auxiliary upper tube is provided in the adjustment frame, and an auxiliary adjustment mechanism for adjusting the steam discharged from the main upper tube to enter the auxiliary lower tube or the exhaust pipe is provided on the adjustment block.

[0008] In the above technical solution, further, the bottom end of the main upper tube is fixedly connected to one side of the regulating frame, the bottom end of the auxiliary upper tube is fixedly connected to the other side of the regulating frame, the rear side of the regulating frame is fixedly connected with a steam inlet pipe, the bottom end of the main lower tube is fixedly connected to the front side of the regulating block, the bottom end of the auxiliary lower tube is fixedly connected to the top of the regulating block, and a connecting pipe is fixedly connected between the side wall of the regulating block and the exhaust pipe.

[0009] In the above technical solution, further, the main adjusting mechanism includes an upper electric telescopic cylinder, a pair of the upper electric telescopic cylinders are provided, and the upper electric telescopic cylinders are fixedly connected to the side walls of the adjusting frame, the middle part of the bottom end of the adjusting frame is fixedly connected to the bottom plate, the side wall of the bottom plate is slidably connected to an L-shaped plate, the inner side of the side wall of the L-shaped plate is fixedly connected to an L-shaped tube, a conical sealing ring is provided next to the outlet at the top of the L-shaped tube, an upper corrugated pipe is fixedly connected between the conical sealing ring and the L-shaped tube, the top end of the exhaust pipe is fixedly connected to the top pipe relative to the lower position of the L-shaped tube, the bottom end of the outer wall of the conical sealing ring is fixedly connected to the lower plate, the side wall of the lower plate is fixedly connected with a round rod, the bottom end of the adjusting frame is slidably connected to the extrusion plate, the side wall of the extrusion plate is fixedly connected to the side plate, and the output end seal of the upper electric telescopic cylinder passes through the inner wall of the adjusting frame and is fixedly connected to the side wall of the side plate.

[0010] In the above technical solution, further, a lower corrugated pipe is fixedly connected between the top pipe and the bottom end of the L-shaped pipe, the side wall of the extrusion plate is inclined, the round rod is arranged on the inclined surface of the extrusion plate, a pair of upper springs are fixedly connected between the bottom end of the adjustment frame and the bottom end of the L-shaped plate, a push plate is fixedly connected to the top end of the extrusion plate, and a one-way valve is provided on the top pipe.

[0011] In the above technical solution, further, the side wall of the L-shaped plate is fixedly connected with a blocking block, the side wall of the blocking block is provided with an L-shaped groove, one side of the round rod is inserted into the inner side of the L-shaped groove, and a rubber pad is fixedly connected between the blocking block and the top of the L-shaped plate.

[0012] In the above technical solution, further, the outer wall of the conical sealing ring is fixedly connected with three guide rods, the outer wall of the L-shaped tube is fixedly connected with three guide rings, the three guide rods are slidably connected to the inner side of the guide ring, and a lower spring is fixedly connected between the outer wall of the guide rod and the side wall of the guide ring.

[0013] In the above technical solution, further, the auxiliary adjustment mechanism includes a lower electric telescopic cylinder, and a pair of the lower electric telescopic cylinders are provided. The lower electric telescopic cylinders are fixedly connected to the side wall of the adjustment block, and the side wall of the adjustment block is provided with a straight groove. The auxiliary lower tube is connected with the straight groove, and the inner side of the straight groove is fixedly connected with a fixing plate at both sides relative to the main lower tube. The side walls of the fixing plates are penetrated with a circular groove, and sealing pads are provided between the fixing plates. The output end seal of the lower electric telescopic cylinder passes through the inner side of the straight groove and is fixedly connected to the side wall of the sealing pad.

[0014] In the above technical solution, further, both ends of the sealing gasket are configured to be conical, and an inspection plate is installed on the side wall of the straight groove through bolt sealing.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The present invention, through the arrangement of the main regulating mechanism, the main heating chamber and the auxiliary heating chamber, can control the steam in the thermal insulation jacket passing through the main heating chamber to enter from the tail of the auxiliary heating chamber and then be discharged into the exhaust pipe when the temperature of the liquid flowing through the inside of the urea pump body is high, thereby "drying out" the latent heat of the steam, resulting in a large degree of supercooling of the condensed water and a low boiler return water temperature, which is more energy-efficient. Moreover, when the temperature of the liquid flowing through the inside of the urea pump body is low, the main upper pipes and the auxiliary upper pipes of the main heating chamber and the auxiliary heating chamber can be fully opened to allow steam to enter from the inlets of the main heating chamber and the auxiliary heating chamber, thereby rapidly heating the liquid in the urea pump, increasing the heat exchange area, and enhancing the flexibility of the equipment.

[0017] 2. The present invention, through the provision of a secondary regulating mechanism, can also block the secondary upper pipe and the secondary lower pipe when the temperature of the liquid flowing through the inside of the urea pump body is medium, so that the steam only passes through the main heating chamber for heat exchange treatment, further improving the flexibility of the equipment. Moreover, through this design, when the secondary heating chamber is blocked, it can immediately switch to another independent operation to ensure that the pump can be maintained without stopping. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the front three-dimensional structure of the urea pump body of the present invention;

[0019] Figure 2 This is a schematic diagram of the front separation of the thermal insulation jacket and the urea pump body of the present invention;

[0020] Figure 3 This is a schematic diagram of the front full-section three-dimensional structure of the thermal insulation jacket of the present invention;

[0021] Figure 4 This is a bottom-up schematic diagram of the three-dimensional structure of the adjustment block and the adjustment frame of the present invention;

[0022] Figure 5 This is a schematic diagram of the front three-dimensional structure of the adjustment frame of the present invention when punching in;

[0023] Figure 6 This is a schematic diagram of the overall appearance of the L-shaped plate, L-shaped tube and upper electric telescopic cylinder of the present invention;

[0024] Figure 7 The appended Figure 6 A schematic diagram of the partially enlarged structure at center A;

[0025] Figure 8 This is a schematic diagram of the overall appearance structure of the L-shaped tube, extruded plate and top tube of the present invention;

[0026] Figure 9 This is a rear-view stereoscopic structural diagram of the adjustment block of the present invention when it is opened;

[0027] Figure 10 It is a rear view half-section stereoscopic structural schematic diagram of the regulating block of the present invention when it is opened.

[0028] Figure: 1. Urea pump body; 2. Insulation jacket; 3. Main heating chamber; 4. Auxiliary heating chamber; 5. Main upper pipe; 6. Auxiliary upper pipe; 7. Main lower pipe; 8. Auxiliary lower pipe; 9. Adjustment frame; 10. Exhaust pipe; 11. Adjustment block; 12. Steam inlet pipe; 13. Upper electric telescopic cylinder; 14. Bottom plate; 15. L-shaped plate; 16. L-shaped pipe; 17. Conical sealing ring; 18. Upper bellows; 19. Top pipe 20. Lower bellows; 21. Lower plate; 22. Round rod; 23. Extrusion plate; 24. Side plate; 25. Upper spring; 26. Sealing block; 27. L-shaped groove; 28. Rubber pad; 29. ​​Guide rod; 30. Guide ring; 31. Lower spring; 32. Lower electric telescopic cylinder; 33. Straight groove; 34. Push plate; 35. Fixed plate; 36. Sealing pad; 37. Inspection plate; 38. One-way valve; 39. Connecting pipe. DETAILED DESCRIPTION

[0029] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] In actual use, it was found that the steam inlet of the jacket on the existing urea pump was only equipped with a manual stop valve or an ordinary temperature control valve, which could only "on / off" or roughly adjust the flow rate, but could not change the flow time of the steam in the jacket (i.e., the effective heat exchange path length or residence time) in real time according to the actual measured temperature of the pump body or the medium. As a result, "underheated crystallization" and "overheated by-products" alternately appeared, becoming a bottleneck restricting long-term and refined production. In order to solve the above problems, the following structure was specially invented.

[0032] like Figures 1-10 The double-suction self-balancing power sealed molten urea pump shown in the figure includes a urea pump body 1 and an insulation jacket 2 sleeved on the outside of the urea pump body 1. A pair of main heating chambers 3 and a pair of auxiliary heating chambers 4 are opened inside the insulation jacket 2. The inlets of the main heating chamber 3 and the auxiliary heating chamber 4 are fixedly connected to the main upper pipe 5 and the auxiliary upper pipe 6 respectively. The outlets of the main heating chamber 3 and the auxiliary heating chamber 4 are fixedly connected to the main lower pipe 7 and the auxiliary lower pipe 8 respectively. A pair of adjustment frames 9 are provided below the insulation jacket 2, an exhaust pipe 10 is provided below the adjustment frame 9, and an adjustment block is provided on the front side of each adjustment frame 9. 11. A main regulating mechanism for regulating the steam entering or being discharged from the auxiliary upper pipe 6 is provided in the regulating frame 9. A secondary regulating mechanism for regulating the steam discharged from the main upper pipe 5 into the auxiliary lower pipe 8 or the exhaust pipe 10 is provided on the regulating block 11 (it should be noted that a temperature sensor needs to be provided inside the urea pump body 1 and electrically connected to the main regulating mechanism and the secondary regulating mechanism through a controller. The temperature sensor is set to three temperature intervals. When the temperature reaches the specified interval, it transmits a signal to the controller, which controls the main regulating mechanism and the secondary regulating mechanism to start and perform corresponding operations);

[0033] The bottom end of the main upper tube 5 passes through and is fixedly connected to one side of the regulating frame 9, the bottom end of the auxiliary upper tube 6 passes through and is fixedly connected to the other side of the regulating frame 9, the rear side of the regulating frame 9 passes through and is fixedly connected to a steam inlet pipe 12, the bottom end of the main lower tube 7 passes through and is fixedly connected to the front side of the regulating block 11, the bottom end of the auxiliary lower tube 8 passes through and is fixedly connected to the top of the regulating block 11, and a connecting pipe 39 passes through and is fixedly connected between the side wall of the regulating block 11 and the exhaust pipe 10;

[0034] The main adjustment mechanism includes an upper electric telescopic cylinder 13, which is provided with a pair. The upper electric telescopic cylinders 13 are both fixedly connected to the side walls of the adjustment frame 9. The middle part of the bottom end of the adjusting frame 9 is fixedly connected to the bottom plate 14. The side wall of the bottom plate 14 is slidably connected to an L-shaped plate 15. The inner side wall of the L-shaped plate 15 is fixedly connected to an L-shaped tube 16. A conical sealing ring 17 is provided next to the outlet of the top of the L-shaped tube 16. An upper bellows 18 is fixedly connected between the conical sealing ring 17 and the L-shaped tube 16. The top of the exhaust pipe 10 is fixedly connected to a top pipe 19 relative to the lower position of the L-shaped tube 16. The bottom end of the outer wall of the conical sealing ring 17 is fixedly connected to the lower plate 21. The side wall of the lower plate 21 is fixedly connected with a round rod 22. The bottom end of the inner bottom of the adjusting frame 9 is slidably connected to the extrusion plate 23. The side wall of the extrusion plate 23 is fixedly connected to the side plate 24. The output end seal of the upper electric telescopic cylinder 13 penetrates the inner wall of the adjusting frame 9 and is fixedly connected to the side wall of the side plate 24.

[0035] A lower bellows 20 is fixedly connected between the top pipe 19 and the bottom end of the L-shaped tube 16. The setting of the lower bellows 20 not only does not hinder the up and down movement of the L-shaped tube 16, but also ensures the communication between the L-shaped tube 16, the top pipe 19 and the exhaust pipe 10. The upper bellows 18 and the lower bellows 20 are both made of high-temperature resistant stainless steel. The side wall of the extrusion plate 23 is inclined, and the round rod 22 is arranged on the inclined surface of the extrusion plate 23. A pair of upper springs 25 are fixedly connected between the bottom end of the inner bottom end of the adjustment frame 9 and the bottom end of the L-shaped plate 15. Through the setting of the upper springs 25, when the extrusion plate 23 is reset and the extrusion of the L-shaped plate 15 is released, the L-shaped plate 15 can be quickly pulled to reset. A push plate 34 is fixedly connected to the top of the extrusion plate 23. A one-way valve 38 is provided on the top pipe 19. The setting of the one-way valve 38 prevents the exhaust gas in the exhaust pipe 10 from passing through the L-shaped tube 16 into the adjusting frame 9;

[0036] The side wall of the L-shaped plate 15 is fixedly connected to a blocking block 26, and an L-shaped groove 27 is opened on the side wall of the blocking block 26. One side of the round rod 22 is inserted into the inner side of the L-shaped groove 27. The setting of the L-shaped groove 27 can play a positioning and guiding role in the sliding direction of the conical sealing ring 17, ensuring that the conical sealing ring 17 moves according to the specified route. A rubber pad 28 is fixedly connected between the blocking block 26 and the top of the L-shaped plate 15. The setting of the rubber pad 28 can play a sealing role when the L-shaped plate 15 and the blocking block 26 are pulled onto the bottom plate 14, thereby preventing more high-temperature steam from entering this space and increasing the flow rate of steam in the regulating frame 9;

[0037] Three guide rods 29 are fixedly connected to the outer wall of the conical sealing ring 17, and three guide rings 30 are fixedly connected to the outer wall of the L-shaped tube 16. The three guide rods 29 are slidably connected to the inner side of the guide ring 30. A lower spring 31 is fixedly connected between the outer wall of the guide rod 29 and the side wall of the guide ring 30. The setting of the guide ring 30 of the guide rod 29 can guide the sliding of the conical sealing ring 17 and connect the conical sealing ring 17 to the L-shaped tube 16, ensuring that when the round rod 22 below the conical sealing ring 17 is squeezed, the L-shaped tube 16 and the L-shaped plate 15 can be driven to move upward together;

[0038] During the operation of the urea pump body 1, when the temperature of the liquid flowing through the pump body is low, steam will enter through the steam inlet pipe 12 (at this time, the L-shaped plate 15 is located next to the bottom plate 14, and the auxiliary upper pipe 6 is in an unblocked state), and then the steam will enter the main heating chamber 3 and the auxiliary heating chamber 4 through the main upper pipe 5 and the auxiliary upper pipe 6, and then be discharged into the exhaust pipe 10 through the connecting pipe 39, thereby realizing rapid heat exchange.

[0039] When the temperature sensor in the urea pump body 1 detects that the temperature of the flowing liquid is high, it transmits a signal to the controller, which controls the upper electric telescopic cylinder 13 to start and drive the extrusion plate 23 to move, and then the round rod 22 is squeezed upward by the inclined surface of the extrusion plate 23 (because the other end of the round rod 22 slides in the L-shaped groove 27 and is restricted, the round rod 22, the lower plate 21 and the conical sealing ring 17 can only slide upward at this time, and then slide upward under the extrusion of the inclined surface of the extrusion plate 23), and at the same time, the L-shaped tube 16 is driven upward by the guide rod 29. The upper spring 25 is stretched and the lower bellows 20 is stretched at the same time. Then the conical sealing ring 17 moves to the side of the main lower tube 7, and the top of the rubber pad 28 contacts the top of the inner side of the adjusting frame 9, which has a certain blocking effect on the other side of the bottom plate 14, thereby preventing a large amount of steam from entering the adjusting frame 9 relative to the position below the L-shaped plate 15, so that the steam can quickly enter the main upper tube 5. At the same time, the round rod 22 moves to the corner of the L-shaped groove 27, and at this time the other end of the round rod 22 slides out from the inclined surface of the extrusion plate 23, slides to the top of the extrusion plate 23, and is located next to the push plate 34;

[0040] Then, the upper electric telescopic cylinder 13 continues to pull the extrusion plate 23 to slide, and the push plate 34 drives the round rod 22 to move toward the side of the auxiliary upper tube 6 (because the L-shaped plate 15 and the L-shaped tube 16 are fixedly connected, and the L-shaped plate 15 slides longitudinally on the side wall of the bottom plate 14, the L-shaped plate 15 and the L-shaped tube 16 cannot slide laterally, and thus the round rod 22 cannot pull the L-shaped tube 16 to move). At the same time, the guide rod 29 is driven to move on the guide ring 30, compressing the lower spring 31 and stretching the upper bellows 18, and then the conical sealing ring 17 is tightly pushed into the auxiliary upper tube 6, thereby achieving sealed communication between the L-shaped tube 16 and the auxiliary upper tube 6;

[0041] At the same time, the controller will control the sub-adjustment mechanism to seal the side end of the connecting pipe 39 connected to the exhaust pipe 10, thereby completing the adjustment. At this time, the steam enters the adjustment frame 9 through the steam inlet pipe 12, and then enters the main heating chamber 3 through the main upper pipe 5 for heat exchange treatment, and then is discharged into the sub-adjustment mechanism through the main lower pipe 7, enters the sub-lower pipe 8, and then enters the sub-heating chamber 4, and is discharged from the sub-upper pipe 6 at the other end. At this time, the sub-upper pipe 6 is connected with the top pipe 19 through the L-shaped pipe 16, and then the exhaust gas will be discharged into the exhaust pipe 10, so that when the liquid temperature in the urea pump body 1 is high, the heat of the steam is completely converted.

[0042] To sum up, through the design of the above structure, when the temperature of the liquid flowing through the inside of the urea pump body 1 is high, the steam passing through the main heating chamber 3 in the insulation jacket 2 can be controlled to enter from the tail of the auxiliary heating chamber 4 and then discharged into the exhaust pipe 10, which can "dry out" the latent heat of the steam, the condensed water has a large degree of supercooling, the boiler return water temperature is low, and it is more energy-efficient. Moreover, when the temperature of the liquid flowing through the inside of the urea pump body 1 is low, the main upper pipe 5 and the auxiliary upper pipe 6 of the main heating chamber 3 and the auxiliary heating chamber 4 can be fully opened to allow steam to enter from the entrance of the main heating chamber 3 and the auxiliary heating chamber 4, quickly heat up the liquid in the urea pump body 1, and increase the heat exchange area, increase the flexibility of the equipment, and can be flexibly adjusted according to the actual temperature.

[0043] On the basis of the above embodiment, it was found during use that the above structure can only be flexibly converted into two heat exchange modes. When the liquid temperature in the urea pump body 1 is in the middle, the rapid heat exchange mode is used, which is relatively wasteful. If the long-distance heat exchange mode is used, the efficiency is low and cannot meet the use requirements. In order to solve the above problems, the above structure has been further improved.

[0044] The auxiliary adjustment mechanism includes a lower electric telescopic cylinder 32. A pair of lower electric telescopic cylinders 32 are provided. Both lower electric telescopic cylinders 32 are fixedly connected to the side wall of the adjustment block 11. A straight groove 33 is opened on the side wall of the adjustment block 11. The auxiliary lower tube 8 is connected to the straight groove 33. The inner side of the straight groove 33 is fixedly connected to the position on both sides of the main lower tube 7. The side walls of the fixing plates 35 are penetrated by circular grooves. There are blocking pads 36 between the fixing plates 35. The blocking pads 36 are made of high-temperature resistant rubber material. The output end of the lower electric telescopic cylinder 32 is sealed and passes through the inner side of the straight groove 33 and is fixedly connected to the side wall of the blocking pad 36.

[0045] Both ends of the blocking pad 36 are set to be conical. The blocking pad 36 can be tightly squeezed on the circular groove by pulling the lower electric telescopic cylinder 32 to improve the blocking effect on the fixed plate 35. The side wall of the straight groove 33 is sealed with an access plate 37 by bolts.

[0046] When the temperature sensor in the urea pump body 1 detects that the temperature of the flowing liquid is high, the controller will control the lower electric telescopic cylinder 32 to start and drive the blocking pad 36 to move, so that the blocking pad 36 moves to the circular groove on the fixing plate 35 on the side close to the connecting pipe 39, thereby blocking the steam discharged from the main lower pipe 7 from entering the connecting pipe 39. When the steam is discharged from the main lower pipe 7, the steam will enter the auxiliary lower pipe 8, and then exchange heat there.

[0047] When the temperature sensor in the urea pump body 1 detects that the temperature of the flowing liquid is low, the steam will be discharged through the main heating chamber 3 and the auxiliary heating chamber 4, and then discharged into the straight groove 33 through the main lower pipe 7 and the auxiliary lower pipe 8. At this time, it is necessary to control the lower electric telescopic cylinder 32 to start and drive the blocking gasket 36 out of the circular groove on the fixed plate 35, and move the blocking gasket 36 to the position between the fixed plates 35, so as not to block the two circular grooves, so that the steam discharged from the main lower pipe 7 and the auxiliary lower pipe 8 can be directly discharged into the exhaust pipe 10 through the connecting pipe 39;

[0048] However, when the temperature sensor in the urea pump body 1 detects that the temperature of the flowing liquid is in the middle range, the controller will control the lower electric telescopic cylinder 32 to start and drive the blocking pad 36 to move to the circular groove on the fixed plate 35 near the side of the auxiliary lower tube 8, thereby blocking the bottom end of the auxiliary lower tube 8. At the same time, the controller will control the upper electric telescopic cylinder 13 to start and connect the auxiliary upper tube 6 with the L-shaped tube 16 to ensure that the steam in the adjustment frame 9 does not enter the auxiliary heating chamber 4, thereby completing the adjustment. At this time, the steam entering from the steam inlet pipe 12 will only be discharged through the main heating chamber 3.

[0049] In summary, through the design of the above structure, when the temperature of the liquid flowing through the inside of the urea pump body 1 is medium, the auxiliary upper pipe 6 and the auxiliary lower pipe 8 can be blocked, so that the steam only passes through the main heating chamber 3 for heat exchange treatment, further improving the flexibility of the equipment. In addition, through this design, when the auxiliary heating chamber 4 is blocked, it can be immediately switched to another independent operation to ensure that the pump is not stopped for maintenance.

[0050] The basic principles, main features and advantages of the present invention are shown and described above.

[0051] Those skilled in the art should understand that the present invention is not limited to the above-mentioned embodiments. The above-mentioned embodiments and the specification only describe the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. These changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A double-suction self-balancing power-sealed molten urea pump, comprising a urea pump body (1) and a heat-insulating jacket (2) sleeved on the outside of the urea pump body (1), characterized in that: A pair of main heating chambers (3) and a pair of auxiliary heating chambers (4) are provided inside the thermal insulation jacket (2); the inlets of the main heating chamber (3) and the auxiliary heating chamber (4) are fixedly connected to the main upper tube (5) and the auxiliary upper tube (6), respectively; the outlets of the main heating chamber (3) and the auxiliary heating chamber (4) are fixedly connected to the main lower tube (7) and the auxiliary lower tube (8), respectively; a pair of regulating frames (9) are provided below the thermal insulation jacket (2); an exhaust pipe (10) is provided below the regulating frames (9); a regulating block (11) is provided on the front side of each regulating frame (9); a main regulating mechanism for regulating the steam entering or being discharged from the auxiliary upper tube (6) is provided inside the regulating frame (9); and an auxiliary regulating mechanism for regulating the steam discharged from the main upper tube (5) into the auxiliary lower tube (8) or the exhaust pipe (10) is provided on the regulating block (11); The main adjustment mechanism includes an upper electric telescopic cylinder (13), a pair of the upper electric telescopic cylinders (13) are provided, and the upper electric telescopic cylinders (13) are fixedly connected to the side wall of the adjustment frame (9), the middle of the bottom end of the adjustment frame (9) is fixedly connected to the bottom plate (14), the side wall of the bottom plate (14) is slidably connected to the L-shaped plate (15), the inner side of the side wall of the L-shaped plate (15) is fixedly connected to the L-shaped tube (16), a conical sealing ring (17) is provided next to the outlet of the top of the L-shaped tube (16), and a conical sealing ring (17) is fixed between the conical sealing ring (17) and the L-shaped tube (16). The upper bellows (18) is fixedly connected to the exhaust pipe (10), the top end of the exhaust pipe (10) is fixedly connected to the top pipe (19) at a position below the L-shaped pipe (16), the bottom end of the outer wall of the conical sealing ring (17) is fixedly connected to the lower plate (21), the side wall of the lower plate (21) is penetrated and fixedly connected to a round rod (22), the bottom end of the inner bottom of the regulating frame (9) is slidably connected to the extrusion plate (23), the side wall of the extrusion plate (23) is fixedly connected to the side plate (24), and the output end of the upper electric telescopic cylinder (13) is sealed and penetrates the inner wall of the regulating frame (9) and is fixedly connected to the side wall of the side plate (24); The bottom end of the main upper tube (5) is fixedly connected to one side of the regulating frame (9), the bottom end of the auxiliary upper tube (6) is fixedly connected to the other side of the regulating frame (9), the rear side of the regulating frame (9) is fixedly connected to a steam inlet pipe (12), the bottom end of the main lower tube (7) is fixedly connected to the front side of the regulating block (11), the bottom end of the auxiliary lower tube (8) is fixedly connected to the top of the regulating block (11), and a connecting pipe (39) is fixedly connected between the side wall of the regulating block (11) and the exhaust pipe (10); A lower bellows (20) is fixedly connected between the top tube (19) and the bottom end of the L-shaped tube (16); the side wall of the extrusion plate (23) is inclined; the round rod (22) is arranged on the inclined surface of the extrusion plate (23); a pair of upper springs (25) are fixedly connected between the inner bottom end of the adjustment frame (9) and the bottom end of the L-shaped plate (15); a push plate (34) is fixedly connected to the top end of the extrusion plate (23); and a one-way valve (38) is provided on the top tube (19); The side wall of the L-shaped plate (15) is fixedly connected with a blocking block (26), the side wall of the blocking block (26) is provided with an L-shaped groove (27), one side of the round rod (22) is inserted into the inner side of the L-shaped groove (27), and a rubber pad (28) is fixedly connected between the blocking block (26) and the top end of the L-shaped plate (15); The auxiliary adjustment mechanism comprises a lower electric telescopic cylinder (32), a pair of which are provided. The lower electric telescopic cylinders (32) are both fixedly connected to the side wall of the adjustment block (11), the side wall of the adjustment block (11) is provided with a straight groove (33), the auxiliary lower tube (8) is connected to the straight groove (33), the inner side of the straight groove (33) is fixedly connected to a fixing plate (35) at both sides relative to the main lower tube (7), the side wall of the fixing plate (35) is provided with a circular groove, and a blocking gasket (36) is provided between the fixing plates (35), and the output end of the lower electric telescopic cylinder (32) is sealed and passes through the inner side of the straight groove (33) and is fixedly connected to the side wall of the blocking gasket (36).

2. The double-suction self-balancing dynamic sealed molten urea pump according to claim 1, characterized in that: Three guide rods (29) are fixedly connected to the outer wall of the conical sealing ring (17), and three guide rings (30) are fixedly connected to the outer wall of the L-shaped tube (16). The three guide rods (29) are slidably connected to the inner side of the guide ring (30), and a lower spring (31) is fixedly connected between the outer wall of the guide rod (29) and the side wall of the guide ring (30).

3. The double-suction self-balancing dynamic sealed molten urea pump according to claim 1, characterized in that: Both ends of the sealing gasket (36) are configured to be conical, and an inspection plate (37) is installed on the side wall of the straight groove (33) through bolt sealing.

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