A centrifugal urea pump

Abstract

The present invention relates to the technical field of urea pumps, specifically, a centrifugal urea pump. An impeller is rotatably connected inside the pump housing, and the outer periphery of the impeller is recessed to form a plurality of liquid storage tanks. A hydraulic pipe is connected to the axis of the impeller, and a connecting channel is provided between the hydraulic pipe and the liquid storage tank. The outer end of the connecting channel is slidably connected to a first electromagnet, and an adjusting plate is rotatably connected to the side of the liquid storage tank away from the axis of the impeller. When the first electromagnet is energized, the adjusting plate is magnetically attracted to make the liquid storage tank in an open state, and a limit assembly is provided on the inner wall of the liquid storage tank opposite to the movable end of the adjusting plate, and the limit assembly is used to prevent the adjusting plate from falling out of the liquid storage tank. During the operation of the impeller, the liquid storage tank is closed by the adjusting plate, so that the inside of the liquid storage tank is in a negative pressure state. When the liquid storage tank is connected to the liquid inlet cavity, urea can be quickly pushed into the liquid storage cavity, so as to achieve efficient flow and precise control of urea.

Description

Technical Field

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

[0002] The urea pump is the core component in 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 an impeller to pump urea out of the urea tank. The urea pump generally does not have a metering function for the spray flow rate. During use, the urea flow rate is only measured by a flow valve, etc., which often leads to inaccurate urea spraying amount, thereby affecting the content of pollutants in automobile exhaust.

[0004] Therefore, the present application provides a centrifugal urea pump to solve the problem that the urea pump in the prior art does not have a flow metering function, and improves the accuracy of the urea spraying amount. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a centrifugal urea pump.

[0006] The technical solution adopted by the present invention to solve its technical problem is: a centrifugal urea pump, including a pump casing, an impeller is rotatably connected inside the pump casing, the outer periphery of the impeller is recessed to form a plurality of liquid storage tanks, the axis of the impeller is connected to a hydraulic pipe, a connecting channel is provided between the hydraulic pipe and the liquid storage tank, the outer end of the connecting channel is slidably connected to a first electromagnet, the side of the liquid storage tank away from the axis of the impeller is rotatably connected to an adjustment plate, when the first electromagnet is energized, the adjustment plate is magnetically attracted to make the liquid storage tank in an open state, a limit assembly is provided on the inner wall of the liquid storage tank opposite to the movable end of the adjustment plate, and the limit assembly is used to prevent the adjustment plate from falling out of the liquid storage tank.

[0007] As an optimization, the outer periphery of the impeller is in contact and sealed with the inner wall of the pump housing, a liquid spray nozzle and a liquid inlet cavity are arranged in the circumferential direction of the pump housing, and the liquid inlet cavity is provided with a liquid inlet pipe and a pressure sensor;

[0008] The outer end of the liquid inlet cavity is connected to a regulating cavity, an regulating plug is arranged inside the regulating cavity, a telescopic rod is arranged outside the regulating cavity, the extended end of the telescopic rod is connected to the regulating plug, and when the telescopic rod is extended, the regulating plug pushes urea into the liquid storage tank.

[0009] As an optimization, the connection end between the adjustment plate and the liquid storage tank is arranged in front of the impeller rotation direction, and the liquid inlet chamber and the liquid spray nozzle are respectively located in front of the impeller rotation direction and behind the impeller rotation direction.

[0010] As an optimization, the diameter of one end of the connecting channel away from the hydraulic pipe is increased to form an adjustment channel, and the first electromagnet is in contact and sealed with the inner wall of the adjustment channel. When the hydraulic oil inside the connecting channel increases, the first electromagnet moves outward along the axis of the adjustment channel.

[0011] As an optimization, the connecting channel is equipped with a liquid pump, a second electromagnet is arranged on the back of the adjustment plate, the first electromagnet and the second electromagnet are arranged opposite to each other, and the adjustment plate is a metal plate.

[0012] As an optimization, the side of the liquid storage tank connected to the connecting channel is a straight segment, and the side of the liquid storage tank opposite to the connecting channel is an arc segment. The end of the arc segment close to the impeller axis gradually converges and connects to the straight segment, and the movable end of the adjustment plate contacts the arc segment.

[0013] As an optimization, the limit assembly includes a plurality of limit electromagnets, which are evenly distributed in a section of the arc segment away from the impeller axis, and the magnetic attraction width of the plurality of limit electromagnets gradually decreases from the impeller axis to the outside.

[0014] As an optimization, when the adjustment plate moves to the opening of the liquid storage tank, the outer side of the adjustment plate can contact and seal with the inner wall of the pump housing, so that a low-pressure space is formed in the liquid storage tank. When the liquid storage tank rotates to the liquid inlet cavity, urea can quickly push the adjustment plate open and enter the interior of the liquid storage tank.

[0015] This scheme is a centrifugal urea pump, which has the following benefits:

[0016] The impeller of the present application is provided with a plurality of liquid storage tanks, the internal capacity of which is adjustable, and the capacity of the liquid storage tank can be adjusted according to the required urea spraying amount, so as to realize accurate control of the urea spraying amount;

[0017] During the operation of the impeller, the liquid storage tank is closed by adjusting the plate, so that the inside of the liquid storage tank is in a negative pressure state. When the liquid storage tank is connected with the liquid inlet cavity, urea can be quickly pushed into the liquid storage cavity, realizing efficient flow and precise control of urea. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an axial schematic diagram of the present invention.

[0019] Figure 2 It is a main schematic diagram of the present invention.

[0020] Figure 3 For the present invention Figure 2 Schematic diagram of the AA section structure.

[0021] Figure 4 It is a schematic diagram of the impeller shaft side of the present invention.

[0022] Figure 5 For the present invention Figure 3 Schematic diagram of the enlarged structure of part A.

[0023] Figure 6 For the present invention Figure 4 Schematic diagram of the enlarged structure of part B.

[0024] Among them, 1. pump casing, 2. impeller, 3. hydraulic pipe, 4. liquid storage tank, 5. connecting channel, 6. first electromagnet, 7. adjusting plate, 8. liquid spray nozzle, 9. liquid inlet chamber, 10. liquid inlet pipe, 11. pressure sensor, 12. adjusting chamber, 13. adjusting plug, 14. telescopic rod, 15. adjusting channel, 16. second electromagnet, 17. limit electromagnet. DETAILED DESCRIPTION

[0025] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0026] like Figure 1-Figure 6 As shown, a centrifugal urea pump comprises a pump casing 1, wherein an impeller 2 is rotatably connected inside the pump casing 1, and the outer periphery of the impeller 2 is recessed to form a plurality of liquid storage tanks 4, a hydraulic pipe 3 is connected to the axis of the impeller 2, a connecting channel 5 is provided between the hydraulic pipe 3 and the liquid storage tank 4, a first electromagnet 6 is slidably connected to the outer end of the connecting channel 5, an adjusting plate 7 is rotatably connected to the side of the liquid storage tank 4 away from the axis of the impeller 2, and when the first electromagnet 6 is energized, the adjusting plate 7 is magnetically attracted to make the liquid storage tank 4 in an open state, and a limiting component is provided on the inner wall of the liquid storage tank 4 opposite to the movable end of the adjusting plate 7, and the limiting component is used to prevent the adjusting plate 7 from falling out of the liquid storage tank 4.

[0027] The hydraulic pipe 3 is used to provide hydraulic oil to the inside of the connecting channel 5. The outer end of the connecting channel 5 is closed by the first electromagnet 6. When the hydraulic oil in the connecting channel 5 increases, the first electromagnet 6 moves toward the inside of the liquid storage tank 4; when the hydraulic oil in the connecting channel 5 decreases, the first electromagnet 6 is driven to retract into the inside of the connecting channel 5.

[0028] like Figure 3As shown, the outer periphery of the impeller 2 is in contact and sealed with the inner wall of the pump housing 1, and a liquid spray nozzle 8 and a liquid inlet cavity 9 are provided in the circumferential direction of the pump housing 1, and the liquid inlet cavity 9 is provided with a liquid inlet pipe 10 and a pressure sensor 11;

[0029] The outer end of the liquid inlet cavity 9 is connected to a regulating cavity 12, an regulating plug 13 is arranged inside the regulating cavity 12, a telescopic rod 14 is arranged outside the regulating cavity 12, and the extended end of the telescopic rod 14 is connected to the regulating plug 13. When the telescopic rod 14 is extended, the regulating plug 13 pushes urea into the liquid storage tank 4.

[0030] Urea enters the liquid inlet chamber 9 through the liquid inlet pipe 10. When the liquid storage tank 4 is connected to the liquid inlet chamber 9, urea flows from the liquid inlet chamber 9 into the liquid storage tank 4. The hydraulic pressure inside the liquid inlet chamber 9 is detected by the pressure sensor 11. When the hydraulic pressure inside the liquid inlet chamber 9 decreases, the telescopic rod 14 is extended to pressurize the liquid inside the liquid inlet chamber 9, so that urea can flow into the liquid storage tank 4 more smoothly.

[0031] like Figure 3 As shown, the connection end between the regulating plate 7 and the liquid storage tank 4 is arranged in front of the impeller 2 in the rotation direction, and the liquid inlet chamber 9 and the liquid spray nozzle 8 are respectively located in front of the impeller 2 in the rotation direction and behind the impeller 2 in the rotation direction.

[0032] according to Figure 3 It can be seen that when the liquid storage cavity that has released urea leaves the inner side of the liquid spray nozzle 8, the adjustment plate 7 can be pushed into the liquid storage tank 4 by the pump housing 1, and the problem of the adjustment plate 7 being stuck by the pump housing 1 will not occur.

[0033] The emptied liquid storage tank 4 rotates to the lower side of the liquid inlet chamber 9, and urea is filled into the liquid storage tank 4 from top to bottom. The liquid storage tank 4 filled with urea continues to rotate and reaches the inner side of the liquid spray nozzle 8.

[0034] like Figure 2 and Figure 3 As shown, the diameter of one end of the connecting channel 5 away from the hydraulic pipe 3 increases to form an adjusting channel 15, and the first electromagnet 6 is in contact and sealed with the inner wall of the adjusting channel 15. When the hydraulic oil inside the connecting channel 5 increases, the first electromagnet 6 moves outward along the axis of the adjusting channel 15.

[0035] like Figure 3 and Figure 5 As shown, the connecting channel 5 is provided with a liquid pump, a second electromagnet 16 is provided on the back of the regulating plate 7, the first electromagnet 6 and the second electromagnet 16 are arranged opposite to each other, and the regulating plate 7 is a metal plate.

[0036] When the electrodes on the opposite sides of the first electromagnet 6 and the second electromagnet 16 are opposite after being energized, the first electromagnet 6 can quickly attract the adjustment plate 7 inwards to quickly open the opening of the liquid storage tank 4. Similarly, when the electrodes on the opposite sides of the first electromagnet 6 and the second electromagnet 16 are the same after being energized, the adjustment plate 7 can be pushed outwards to release urea outwards.

[0037] like Figure 3 and Figure 5 As shown, the side where the liquid storage tank 4 is connected to the connecting channel 5 is a straight line segment, and the side opposite to the connecting channel 5 is an arc segment. The end of the arc segment close to the axis of the impeller 2 gradually converges and is connected to the straight line segment, and the movable end of the adjustment plate 7 is in contact with the arc segment.

[0038] by Figure 5 For example, the front side surface of the adjustment plate 7 and the rear side surface of the adjustment plate 7 are both in contact and sealed with the inner side surface of the liquid storage tank 4. When the position of the first electromagnet 6 changes, the movable range of the adjustment plate 7 changes, that is, the capacity of the liquid storage tank 4 can change.

[0039] like Figure 5 As shown, the limiting assembly includes a plurality of limiting electromagnets 17 , which are evenly distributed in a section of the arc segment away from the axis of the impeller 2 , and the magnetic attraction width of the plurality of limiting electromagnets 17 gradually decreases from the axis of the impeller 2 outward.

[0040] The regulating plate 7 is magnetically limited by the limiting electromagnet 17 to prevent the regulating plate 7 from popping out from the opening of the liquid storage tank 4 .

[0041] like Figure 3 As shown, when the adjusting plate 7 moves to the opening of the liquid storage tank 4, the outer side of the adjusting plate 7 can contact and seal with the inner wall of the pump housing 1, so that a low-pressure space is formed in the liquid storage tank 4. When the liquid storage tank 4 rotates to the liquid inlet cavity 9, urea can quickly push the adjusting plate 7 open and enter the liquid storage tank 4.

[0042] The regulating plate 7 moves outward under the repulsive force given by the first electromagnet 6. When urea is instantly released at the liquid spray nozzle 8, the pressure outside the regulating plate 7 is instantly reduced, and then the regulating plate 7 moves to the inside of the pump housing 1. The inside of the liquid inlet cavity 9 is a high-pressure area, and the inside of the liquid storage tank 4 forms a low-pressure space, which is conducive to the flow of urea into the liquid storage cavity.

[0043] Directions:

[0044] When the device is used, the urea in the urea tank is discharged into the liquid inlet chamber 9 through the liquid inlet pipe 10, and the hydraulic pressure in the liquid inlet chamber 9 is detected by the pressure sensor 11. The liquid inlet pipe 10 is connected to a liquid pump to keep a certain hydraulic pressure in the liquid inlet chamber 9 at all times.

[0045] A motor is installed in the axial direction of the impeller 2. Figure 3 In the direction shown, the motor drives the impeller 2 to rotate counterclockwise;

[0046] When the liquid storage tank 4 rotates to the inner side of the liquid inlet chamber 9, due to the presence of a certain hydraulic pressure of urea in the liquid inlet chamber 9, the urea can quickly flow into the liquid storage tank 4, and at the same time, the first electromagnet 6 and the second electromagnet 16 are energized so that the two can be magnetically attracted, and the auxiliary adjustment plate 7 is quickly rotated inward, and the urea quickly fills the liquid storage tank 4;

[0047] As the impeller 2 continues to rotate, the liquid storage tank 4 with urea rotates to the liquid spray nozzle 8, and the first electromagnet 6 and the second electromagnet 16 are energized to repel each other. Under the action of repulsive force and pressure, the adjustment plate 7 is quickly rotated outward to release urea.

[0048] The limit electromagnet 17 is energized, and the outward rotating adjustment plate 7 is magnetically decelerated by the limit electromagnet 17 to prevent the adjustment plate 7 from sliding outward from the opening of the liquid storage tank 4;

[0049] After the urea is released, the empty liquid storage tank 4 continues to rotate toward the liquid inlet chamber 9 to carry out the next urea delivery operation.

[0050] To facilitate efficient use of the device, the adjustment plate 7 can also be connected to the liquid storage tank 4 through a spring shaft, so that the adjustment plate 7 has a tendency to rotate outward. At the same time, the reset strength of the spring shaft should be smaller than the magnetic attraction strength of the first electromagnet 6 and the second electromagnet 16, so that the adjustment plate 7 can rotate inward.

[0051] When the spraying amount of urea needs to be adjusted, the content of the hydraulic oil inside the connecting channel 5 is adjusted through the action of the liquid pump on the connecting channel 5, and then the position of the first electromagnet 6 is adjusted to adjust the rotatable area of ​​the adjustment plate 7, thereby changing the capacity of the liquid storage tank 4.

[0052] The above-mentioned specific implementation is only a specific case 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 implementation. Any centrifugal urea pump that complies with the claims of the present invention and any appropriate changes or modifications made to it by ordinary technicians in the corresponding technical field shall fall within the patent protection scope of the present invention.

Claims

1. A centrifugal urea pump, comprising a pump housing (1), wherein an impeller (2) is rotatably connected to the interior of the pump housing (1), characterized in that: The outer periphery of the impeller (2) is recessed to form a plurality of liquid storage tanks (4); the axis of the impeller (2) is connected to a hydraulic pipe (3); a connecting channel (5) is provided between the hydraulic pipe (3) and the liquid storage tank (4); the outer end of the connecting channel (5) is slidably connected to a first electromagnet (6); a side of the liquid storage tank (4) away from the axis of the impeller (2) is rotatably connected to an adjustment plate (7); when the first electromagnet (6) is energized, the adjustment plate (7) is magnetically attracted to make the liquid storage tank (4) in an open state; a limit assembly is provided on the inner wall of the liquid storage tank (4) opposite to the movable end of the adjustment plate (7); the limit assembly is used to prevent the adjustment plate (7) from falling out of the liquid storage tank (4).

2. A centrifugal urea pump according to claim 1, characterized in that: The outer periphery of the impeller (2) is in contact and sealed with the inner wall of the pump housing (1); a liquid spray nozzle (8) and a liquid inlet cavity (9) are provided in the circumferential direction of the pump housing (1); and the liquid inlet cavity (9) is provided with a liquid inlet pipe (10) and a pressure sensor (11); The outer end of the liquid inlet cavity (9) is connected to a regulating cavity (12), an regulating plug (13) is arranged inside the regulating cavity (12), a telescopic rod (14) is arranged outside the regulating cavity (12), an extended end of the telescopic rod (14) is connected to the regulating plug (13), and when the telescopic rod (14) is extended, the regulating plug (13) pushes urea into the liquid storage tank (4).

3. A centrifugal urea pump according to claim 2, characterized in that: The connection end between the regulating plate (7) and the liquid storage tank (4) is arranged in front of the rotation direction of the impeller (2), and the liquid inlet chamber (9) and the liquid spray nozzle (8) are respectively located in front of the rotation direction of the impeller (2) and behind the rotation direction of the impeller (2).

4. A centrifugal urea pump according to claim 1, characterized in that: The diameter of one end of the connecting channel (5) away from the hydraulic pipe (3) increases to form an adjusting channel (15), and the first electromagnet (6) is in contact and sealed with the inner wall of the adjusting channel (15). When the hydraulic oil in the connecting channel (5) increases, the first electromagnet (6) moves outward along the axis of the adjusting channel (15).

5. A centrifugal urea pump according to claim 1, characterized in that: The connecting channel (5) is provided with a liquid pump, a second electromagnet (16) is provided on the back of the regulating plate (7), the first electromagnet (6) and the second electromagnet (16) are arranged opposite to each other, and the regulating plate (7) is a metal plate.

6. A centrifugal urea pump according to claim 1, characterized in that: The side where the liquid storage tank (4) is connected to the connecting channel (5) is a straight line segment, and the side opposite to the connecting channel (5) is a circular arc segment. The end of the circular arc segment close to the axis of the impeller (2) gradually converges and is connected to the straight line segment, and the movable end of the adjustment plate (7) is in contact with the circular arc segment.

7. A centrifugal urea pump according to claim 6, characterized in that: The limiting assembly comprises a plurality of limiting electromagnets (17), the plurality of limiting electromagnets (17) being evenly distributed in a section of the arc section away from the axis of the impeller (2), and the magnetic attraction width of the plurality of limiting electromagnets (17) gradually decreasing from the axis of the impeller (2) toward the outside.

8. A centrifugal urea pump according to claim 2, characterized in that: When the regulating plate (7) moves to the opening of the liquid storage tank (4), the outer side of the regulating plate (7) can contact and seal with the inner wall of the pump housing (1), so that a low-pressure space is formed in the liquid storage tank (4); when the liquid storage tank (4) rotates to the liquid inlet cavity (9), urea can quickly push the regulating plate (7) away and enter the interior of the liquid storage tank (4).

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