A high-precision centrifugal urea pump

Abstract

The present invention relates to the technical field of urea pumps, specifically a high-precision centrifugal urea pump. The pump comprises a pump housing and an impeller rotatably disposed within the pump housing. The impeller comprises a coaxially arranged fixed portion and a rotating portion. The outer periphery of the rotating portion is recessed to form a plurality of liquid reservoirs. The outer ends of the liquid reservoirs are sealed with elastic membranes. When the elastic membranes are recessed inward, liquid storage spaces are formed outside the elastic membranes. The liquid reservoirs are provided with connecting channels, and the fixed portion is provided with adjustment channels. The adjustment channels are filled with a regulating fluid. When the connecting channel and the adjustment channel are connected, the position of the elastic membranes can be adjusted by adjusting the regulating fluid. When the channels within the fixed portion and the rotating portion are connected relative to form a loop, the regulating fluid within the liquid reservoirs can be adjusted, causing urea in the liquid reservoirs to be ejected outward. The inner wall of the pump housing scrapes away material outside the elastic membranes, allowing the urea to be completely discharged, thereby improving the accuracy of urea spraying.

Description

Technical Field

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

[0002] The urea pump is the core component of the selective catalytic reduction technology (SCR) system. It is mainly used to pump the urea solution out of the urea tank and transport the urea solution to the nozzle to meet the flow and pressure requirements of the injection metering system.

[0003] In the existing urea pump structure, the urea flow is generally driven by the impeller to pump the urea out of the urea tank. The urea pump generally does not have the function of measuring the discharge flow. During use, the urea flow is only measured by a flow valve, etc., which often leads to inaccurate urea discharge volume, thereby affecting the content of pollutants in automobile exhaust.

[0004] To address the above-mentioned issues, a centrifugal urea pump, published in China with patent publication number CN119177946B, features an impeller rotatably connected to the interior of the pump housing. The impeller's outer periphery is recessed to form several liquid reservoirs. A hydraulic pipe is connected to the impeller's axis, and a connecting channel is provided between the hydraulic pipe and the liquid reservoir. A first electromagnet is slidably connected to the outer end of the connecting channel. An adjustment plate is rotatably connected to the side of the liquid reservoir away from the impeller's axis. When the first electromagnet is energized, it magnetically attracts the adjustment plate, causing the liquid reservoir to open. A limit assembly is provided on the inner wall of the liquid reservoir opposite the movable end of the adjustment plate to prevent the adjustment plate from falling out of the reservoir. During impeller operation, the adjustment plate closes the liquid reservoir, creating a negative pressure inside the reservoir. When the reservoir and the liquid inlet chamber are connected, urea can be quickly pushed into the liquid reservoir, achieving efficient flow and precise control of urea.

[0005] However, in this application, the adjustment plate is adjusted by means of structures such as electromagnets, and its accuracy is somewhat insufficient. In addition, the adjustment plate is a hard structure, and some urea is easily adhered to the outer wall of the adjustment plate and cannot be completely discharged.

[0006] Therefore, the present application provides a high-precision centrifugal urea pump to solve the problem of insufficient precision of urea pumps in the prior art. Summary of the Invention

[0007] In order to solve the above problems, the present invention provides a high-precision centrifugal urea pump.

[0008] The technical solution adopted by the present invention to solve the technical problem is: a high-precision centrifugal urea pump, comprising a pump housing and an impeller rotatably arranged inside the pump housing, the impeller comprising a fixed portion and a rotating portion arranged coaxially, the outer periphery of the rotating portion being recessed to form a plurality of liquid storage tanks, the outer ends of the liquid storage tanks being sealed with elastic membranes, and when the elastic membranes are recessed inwardly, liquid storage spaces are formed on the outer sides of the elastic membranes;

[0009] The liquid storage tank is provided with a connecting channel, the fixing portion is provided with an adjusting channel, the interior of the adjusting channel is filled with adjusting liquid, and when the connecting channel is connected with the adjusting channel, the position of the elastic membrane can be adjusted by adjusting the adjusting liquid.

[0010] As an optimization, the regulating channel includes three fixed pipelines arranged in a coaxial array, the three fixed pipelines being a liquid inlet pipeline, a liquid discharge pipeline and an intermediate pipeline, the liquid inlet pipeline facing the liquid inlet pipe of the pump casing, the liquid discharge pipeline facing the liquid spray nozzle of the pump casing, and the intermediate pipeline facing the inner wall of the pump casing;

[0011] The liquid discharge pipeline is equipped with a liquid pump.

[0012] As an optimization, a circular groove is opened at the axis of the rotating part, the fixed part is fitted in the circular groove, the outer periphery of the rotating part is fitted with the inner wall of the pump housing, one end of the connecting channel is connected to the bottom of the liquid storage tank, and the other end of the connecting channel is arranged toward the fixed part;

[0013] When the connecting channel and the regulating channel are relatively connected, the liquid storage tank is connected to the interior of the regulating channel.

[0014] As an optimization, a plurality of detection magnetic blocks are arranged in a circumferential array on the inner side of the rotating part, the number of the detection magnetic blocks is the same as the number of the liquid storage tanks, and the fixed part is provided with a positioning magnetic block;

[0015] When the detection magnetic block and the positioning magnetic block are magnetically attracted to each other, the regulating channel and the connecting channel are connected, and at the same time, the liquid storage tank carrying urea rotates to the inner side of the liquid spray nozzle of the pump housing.

[0016] As an optimization, a regulating liquid is filled between the elastic membrane and the liquid storage tank, and the filling amount of the regulating liquid in the liquid storage tank is not less than 1 / 3 of the volume of the liquid storage tank.

[0017] As an optimization, a driving motor is provided outside the pump housing, and the driving motor is used to drive the rotating part to rotate.

[0018] As an optimization, the number of the liquid storage tanks is 3N, where N is a non-zero natural number. The liquid storage tank includes a liquid-inlet state, an intermediate state, and a liquid-spraying state. In the liquid-inlet state, the liquid storage tank is arranged opposite to the liquid inlet pipe, and the liquid storage tank continues to rotate until it is connected with the regulating channel and reaches the intermediate state.

[0019] In the intermediate state, the regulating liquid in the liquid storage tank is pumped outward, and the elastic membrane is in contact with the inner wall of the liquid storage tank;

[0020] The liquid storage tank continues to rotate until it is connected with the regulating channel and reaches the liquid spraying state. At this time, the regulating liquid is mixed into the liquid storage tank in the liquid spraying state, causing the elastic membrane to pop outward to realize the spraying.

[0021] As an optimization, the liquid inlet pipe of the pump casing is equipped with a liquid supply pipe and a pressure regulating assembly. The pressure regulating assembly includes a telescopic rod and a regulating plug. The regulating plug is slidingly arranged with the inner wall of the liquid inlet pipe. The telescopic rod and the regulating plug are coaxially arranged. The liquid supply pipe is equipped with a solenoid valve.

[0022] As an optimization, when the elastic membrane pops outward, the outer side surface of the elastic membrane protrudes beyond the periphery of the rotating part.

[0023] The high-precision centrifugal urea pump of the present application has the following advantages:

[0024] The urea pump impeller of the present application includes a fixed part and a rotating part. When the fixed part and the channel inside the rotating part are relatively connected to form a loop, the regulating liquid inside the liquid storage tank can be adjusted to make the urea in the liquid storage tank pop outward. When the elastic membrane bulges outward, the inner wall of the pump housing can scrape the material outside the elastic membrane, so that all the urea is discharged outward, thereby improving the accuracy of the urea spraying amount. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is an axial side schematic diagram of the present invention.

[0026] Figure 2 It is a schematic diagram of the back axial side of the present invention.

[0027] Figure 3 It is a right side schematic diagram of the present invention.

[0028] Figure 4 For the present invention Figure 3 AA cross-section structure diagram.

[0029] Figure 5 For the present invention Figure 4 Schematic diagram of the enlarged structure of part B.

[0030] Among them, 1. pump housing, 2. fixed part, 3. rotating part, 4. liquid storage tank, 5. elastic membrane, 6. liquid storage space, 7. connecting channel, 8. adjustment channel, 9. liquid pump, 10. detection magnetic block, 11. positioning magnetic block, 12. liquid nozzle, 13. driving motor, 14. liquid supply pipe, 15. telescopic rod, 16. adjusting plug. DETAILED DESCRIPTION

[0031] like Figure 1-Figure 5 As shown, a high-precision centrifugal urea pump includes a pump housing 1 and an impeller rotatably disposed inside the pump housing 1. The impeller includes a fixed portion 2 and a rotating portion 3 arranged coaxially. The outer periphery of the rotating portion 3 is recessed to form a plurality of liquid storage tanks 4. The outer ends of the liquid storage tanks 4 are sealed with elastic membranes 5. When the elastic membrane 5 is recessed inward, a liquid storage space 6 is formed on the outer side of the elastic membrane 5.

[0032] The liquid storage tank 4 is provided with a connecting channel 7, and the fixing portion 2 is provided with an adjusting channel 8. The adjusting channel 8 is filled with adjusting liquid. When the connecting channel 7 is connected with the adjusting channel 8, the position of the elastic membrane 5 can be adjusted by adjusting the adjusting liquid.

[0033] When the elastic membrane 5 is retracted inward, it can be laid on the bottom of the liquid storage tank 4. When the elastic membrane 5 is ejected outward, it can be stretched outside the opening of the liquid storage tank 4. The fixing portion 2 is fixed to the inside of the pump housing 1.

[0034] like Figure 4 As shown, the regulating channel 8 includes three fixed pipelines arranged in a coaxial array, the three fixed pipelines being a liquid inlet pipeline, a liquid discharge pipeline and an intermediate pipeline. The liquid inlet pipeline faces the liquid inlet pipe of the pump housing 1, the liquid discharge pipeline faces the liquid spray nozzle 12 of the pump housing 1, and the intermediate pipeline faces the inner wall of the pump housing 1;

[0035] The liquid discharge pipeline is equipped with a liquid pump 9 .

[0036] by Figure 4 In the orientation shown, the impeller rotates counterclockwise, the liquid inlet pipeline is arranged vertically, the liquid discharge pipeline is arranged tilted toward the lower right, and the middle pipeline and the liquid discharge pipeline are arranged symmetrically on the left and right.

[0037] like Figure 4 As shown, a circular groove is opened at the axis of the rotating part 3, and the fixed part 2 is fitted in the circular groove. The outer periphery of the rotating part 3 is fitted with the inner wall of the pump housing 1. One end of the connecting channel 7 is connected to the bottom of the liquid storage tank 4, and the other end of the connecting channel 7 is arranged toward the fixed part 2.

[0038] When the connecting channel 7 and the regulating channel 8 are relatively connected, the liquid storage tank 4 and the interior of the regulating channel 8 are connected.

[0039] The setting of the fixed part 2 does not affect the rotation of the rotating part 3. The sealing film seals the open end of the liquid storage tank 4, and there is a smooth transition between the two.

[0040] like Figure 4 As shown, a plurality of detection magnetic blocks 10 are arranged in a circular array on the inner side of the rotating part 3. The number of the detection magnetic blocks 10 is the same as the number of the liquid storage tanks 4. The fixed part 2 is provided with a positioning magnetic block 11.

[0041] When the detection magnetic block 10 and the positioning magnetic block 11 are magnetically attracted to each other, the regulating channel 8 and the connecting channel 7 are connected, and at the same time, the liquid storage tank 4 carrying urea rotates to the inside of the liquid spray nozzle 12 of the pump housing 1.

[0042] Multiple detection magnetic blocks 10 are arranged in a one-to-one correspondence with the liquid storage tank 4. When the detection magnetic block 10 and the positioning magnetic block 11 are magnetically attracted to each other, it indicates that the liquid storage tank 4 corresponding to the detection magnetic block 10 is set toward the liquid nozzle 12. The controller then controls the liquid pump 9 to operate, so that the regulating liquid inside the liquid storage tank 4 that passes through it at the same time flows into the liquid storage tank 4.

[0043] like Figure 4 As shown, the space between the elastic membrane 5 and the liquid storage tank 4 is filled with regulating liquid, and the filling amount of the regulating liquid in the liquid storage tank 4 is not less than 1 / 3 of the volume of the liquid storage tank 4 .

[0044] The regulating channel 8 and the connecting channel 7 are filled with regulating liquid. During the preparation of the regulating liquid, the content of the regulating liquid in the connecting channel 7 and the regulating channel 8 is negligible and does not affect the regulating effect on the elastic membrane 5 .

[0045] like Figure 1 As shown, a driving motor 13 is provided outside the pump housing 1 , and the driving motor 13 is used to drive the rotating part 3 to rotate.

[0046] like Figure 4 As shown, the number of the liquid storage tanks 4 is 3N, where N is a non-zero natural number. The liquid storage tanks 4 include a liquid-intake state, an intermediate state, and a liquid-spraying state. In the liquid-intake state, the liquid storage tanks 4 are arranged opposite to the liquid inlet pipe, and the liquid storage tanks 4 continue to rotate until they are connected to the regulating channel 8, reaching the intermediate state.

[0047] In the intermediate state, the regulating liquid in the liquid storage tank 4 is pumped outward, and the elastic membrane 5 is in contact with the inner wall of the liquid storage tank 4;

[0048] The liquid storage tank 4 continues to rotate until it is connected with the regulating channel 8 and reaches the liquid spraying state. At this time, the regulating liquid is mixed into the liquid storage tank 4 in the liquid spraying state, causing the elastic membrane 5 to pop outward to realize the spraying.

[0049] The number of liquid storage tanks 4 is 3N because the liquid storage tank 4 has three states (liquid inlet state, intermediate state and liquid spraying state), and it is necessary to keep three liquid storage tanks 4 connected to the regulating channel 8 at the same time. Therefore, the number of liquid storage tanks 4 must be a multiple of 3. Figure 4 In the embodiment shown, N is 2, and the number of the liquid storage tanks 4 is 6. Correspondingly, the number of the liquid storage tanks 4 can also be 3, 9, 12, ..., and the specific number of the liquid storage tanks 4 can be set according to the actual size of the urea pump.

[0050] When the elastic membrane 5 pops outward, the outer side of the elastic membrane 5 protrudes more than the outer side of the rotating part 3. When the elastic membrane 5 rotates to contact the inside of the pump housing 1, the pump housing 1 can scrape and clean the material on the surface of the elastic membrane 5, thereby promoting the complete release of urea.

[0051] like Figure 1 As shown, the liquid inlet pipe of the pump housing 1 is equipped with a liquid supply pipe 14 and a pressure regulating assembly. The pressure regulating assembly includes a telescopic rod 15 and a regulating plug 16. The regulating plug 16 is slidingly arranged with the inner wall of the liquid inlet pipe. The telescopic rod 15 and the regulating plug 16 are coaxially arranged. The liquid supply pipe 14 is equipped with a solenoid valve.

[0052] When the elastic membrane 5 pops outward, the outer side surface of the elastic membrane 5 protrudes from the outer periphery of the rotating part 3 .

[0053] Directions:

[0054] When the device is used, the driving motor 13 drives the rotating part 3 to rotate;

[0055] First, if Figure 4 As shown, the liquid storage tank 4 at the top is in the liquid filling state, the elastic membrane 5 is concave inward, the material is sprayed to the elastic membrane 5 through the liquid supply pipe 14, and the telescopic rod 15 is extended, so that urea is quickly sprayed onto the elastic membrane 5;

[0056] The rotating part 3 continues to rotate, and the liquid storage tank 4 with urea rotates to the inner side of the pump housing 1 until the connecting channel 7 of the liquid storage tank 4 is connected with the regulating channel 8. At this time, the regulating liquid in the liquid storage tank 4 is pumped out, and the elastic membrane 5 is further sucked inward, forming an intermediate state.

[0057] The liquid storage tank 4 continues to rotate until it reaches the liquid spraying state. At this time, the connecting channel 7 of the liquid storage tank 4 is connected to the regulating channel 8 again. The positioning magnetic block 11 detects the detection magnetic block 10 corresponding to the liquid storage tank 4, and the controller controls the liquid pump 9 to operate.

[0058] The liquid pump 9 mixes the regulating liquid in the other liquid storage tanks 4 that are connected at the same time through the regulating channel 8 and the connecting channel 7, so that the regulating liquid passes into the liquid storage tank 4 in the spraying state through the connecting channel 7 and the regulating channel 8, causing the elastic membrane 5 to pop outward to achieve spraying;

[0059] The rotating part 3 continues to rotate, and the elastic membrane 5 is in a convex state, and the liquid material on the elastic membrane 5 is scraped off by the pump housing 1 to avoid incomplete release of the material;

[0060] The rotating part 3 continues to rotate, and the liquid storage tank 4 continues to rotate to the liquid-intake state, and the above steps are repeated.

[0061] The above-mentioned specific embodiments are only specific cases of the present invention. The patent protection scope of the present invention includes but is not limited to the product form and style of the above-mentioned specific embodiments. Any high-precision centrifugal urea pump that complies with the claims of the present invention and any appropriate changes or modifications made thereto by ordinary technicians in the corresponding technical field shall fall within the patent protection scope of the present invention.

Claims

1. A high-precision centrifugal urea pump, comprising a pump housing (1) and an impeller rotatably disposed inside the pump housing (1), characterized in that: The impeller comprises a fixed portion (2) and a rotating portion (3) arranged coaxially, the outer periphery of the rotating portion (3) is recessed to form a plurality of liquid storage tanks (4), the outer ends of the liquid storage tanks (4) are sealed with elastic membranes (5), and when the elastic membranes (5) are recessed inwardly, a liquid storage space (6) is formed outside the elastic membranes (5); The liquid storage tank (4) is provided with a connecting channel (7), and the fixing portion (2) is provided with an adjusting channel (8). The interior of the adjusting channel (8) is filled with a regulating liquid. When the connecting channel (7) and the regulating channel (8) are connected, the position of the elastic membrane (5) can be adjusted by adjusting the regulating liquid. The regulating channel (8) comprises three fixed pipelines arranged in a coaxial array, the three fixed pipelines being respectively a liquid inlet pipeline, a liquid discharge pipeline and an intermediate pipeline, the liquid inlet pipeline facing the liquid inlet pipe of the pump housing (1), the liquid discharge pipeline facing the liquid spray nozzle (12) of the pump housing (1), and the intermediate pipeline facing the inner wall of the pump housing (1); The liquid discharge pipeline is provided with a liquid pump (9); When the elastic membrane (5) pops outward, the outer side surface of the elastic membrane (5) protrudes from the outer periphery of the rotating part (3); when the elastic membrane (5) rotates to contact the inside of the pump housing (1), the pump housing (1) can clean the material on the surface of the elastic membrane (5).

2. A high-precision centrifugal urea pump according to claim 1, characterized in that: A circular groove is formed at the axis of the rotating portion (3), the fixed portion (2) is arranged in the circular groove, the outer periphery of the rotating portion (3) is in contact with the inner wall of the pump housing (1), one end of the connecting channel (7) is connected to the bottom of the liquid storage tank (4), and the other end of the connecting channel (7) is arranged toward the fixed portion (2); When the connecting channel (7) and the regulating channel (8) are relatively connected, the liquid storage tank (4) and the interior of the regulating channel (8) are connected.

3. A high-precision centrifugal urea pump according to claim 1, characterized in that: A plurality of detection magnetic blocks (10) are arranged in a circular array on the inner side of the rotating portion (3), the number of the detection magnetic blocks (10) being the same as the number of the liquid storage tanks (4), and the fixed portion (2) is provided with a positioning magnetic block (11); When the detection magnetic block (10) and the positioning magnetic block (11) are magnetically attracted to each other, the regulating channel (8) and the connecting channel (7) are connected, and at the same time, the liquid storage tank (4) carrying urea rotates to the inside of the liquid spray nozzle (12) of the pump housing (1).

4. The high-precision centrifugal urea pump according to claim 1, characterized in that: The space between the elastic membrane (5) and the liquid storage tank (4) is filled with regulating liquid, and the amount of regulating liquid in the liquid storage tank (4) is not less than 1 / 3 of the volume of the liquid storage tank (4).

5. The high-precision centrifugal urea pump according to claim 1, characterized in that: A driving motor (13) is provided outside the pump housing (1), and the driving motor (13) is used to drive the rotating part (3) to rotate.

6. The high-precision centrifugal urea pump according to claim 1, characterized in that: The number of the liquid storage tanks (4) is 3N, where N is a non-zero natural number. The liquid storage tanks (4) include a liquid-intake state, an intermediate state, and a liquid-spraying state. In the liquid-intake state, the liquid storage tanks (4) are arranged opposite to the liquid-intake pipe, and the liquid storage tanks (4) continue to rotate until they are connected to the regulating channel (8), reaching the intermediate state. In the intermediate state, the regulating liquid in the liquid storage tank (4) is drawn outward, and the elastic membrane (5) is in contact with the inner wall of the liquid storage tank (4); The liquid storage tank (4) continues to rotate until it is connected with the regulating channel (8) and reaches a liquid spraying state. At this time, the regulating liquid is mixed into the liquid storage tank (4) in the liquid spraying state, causing the elastic membrane (5) to pop outward to realize the spraying.

7. The high-precision centrifugal urea pump according to claim 1, characterized in that: The liquid inlet pipe of the pump housing (1) is provided with a liquid supply pipe (14) and a pressure regulating assembly. The pressure regulating assembly comprises a telescopic rod (15) and a regulating plug (16). The regulating plug (16) is slidably arranged with the inner wall of the liquid inlet pipe. The telescopic rod (15) and the regulating plug (16) are coaxially arranged. The liquid supply pipe (14) is provided with a solenoid valve.

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