A filling pump for a vehicle urea filling machine

Abstract

The application provides a filling pump for a vehicle urea filling machine, which comprises a pump body assembly, the pump body assembly is provided with an inlet and an outlet, the inlet is connected with a suction pipe, the suction pipe is provided with a solenoid valve I, the outlet is connected with a discharge pipe I, the discharge pipe I is provided below with a discharge pipe II, the discharge pipe I and the discharge pipe II are both provided with three ways, the two-way ports of the discharge pipe I and the discharge pipe II are connected with a shunt pipe, and the shunt pipe is provided with a container on the side. In the application, the container is communicated with the pump cavity, the pipeline is controlled by the solenoid valve, when the filling pump stops, the urea solution source is cut off first, then the container is used to receive the residual urea solution in the pump cavity, the pump cavity where the impeller is located is emptied, so that the impeller is separated from the urea solution when the impeller stops, and the impeller only contacts with the urea solution when working, thereby the corrosion speed of the urea solution to the impeller part is effectively reduced, and the service life of the filling pump is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of filling pumps, and more particularly to a filling pump for a vehicle urea filling machine. Background Technology

[0002] A vehicle urea dispenser is a device specifically designed to add urea solution to the SCR (Selective Catalytic Reduction) system of diesel vehicles (mainly heavy-duty trucks, buses, and construction machinery that meet China IV, China V, and China VI emission standards). Currently, the power source for dispensing urea solution in vehicle urea dispensers is the dispensing pump, which is primarily a non-variable volume pump, meaning the pump's internal volume remains constant.

[0003] The currently used filling pumps remain filled with urea solution after filling stops. Urea solution is corrosive. Although the impeller of the filling pump is made of corrosion-resistant materials such as 316 stainless steel, the impeller is always immersed in urea solution, whether it is in operation or not. Although the corrosion of the impeller by urea solution is slow, it continues due to continuous immersion, which shortens the service life of the filling pump. Summary of the Invention

[0004] The technical problem to be solved by this invention is to overcome the defects of the existing technology. To solve the above technical problem, the technical solution adopted by this invention is: A urea filling pump for a vehicle includes a pump body assembly. The pump body assembly has an inlet and an outlet. A suction pipe is connected to the inlet, and a solenoid valve is installed on the suction pipe. A discharge pipe is connected to the outlet, and a discharge pipe is installed below the discharge pipe. Both discharge pipes are tee-connected. A diverter pipe is connected to the two-way port of discharge pipe 1 and the two-way port of discharge pipe 2. A container is installed on the side of the diverter pipe. Connecting pipes are fixed at both the upper and lower ends of the container. Solenoid valves 2 and 3 are respectively installed at the openings of the upper and lower connecting pipes. Solenoid valves 2 and 3 are connected to the tee ports of discharge pipe 1 and discharge pipe 2.

[0005] The pump body assembly includes a pump body, and a pump head assembly is installed at the front end of the pump body. The pump head assembly includes a front pump head shell and a rear pump head shell. A pump cavity is reserved between the front pump head shell and the rear pump head shell. A front wheel plate and a rear wheel plate are installed in the pump cavity. Multiple impellers with equal spacing are fixed between the front wheel plate and the rear wheel plate. The impellers are arc-shaped. A through hole is preset in the middle of the front wheel plate. A pump shaft is installed in the middle of the rear wheel plate. The pump shaft is fixedly connected to the output end of the pump body. The inlet is set at the middle of the front side of the front pump head shell, which is axially aligned with the through hole. The outlet is set at the bottom middle of the front pump head shell, which is radially aligned with the through hole.

[0006] The through hole has multiple equally spaced suction blades fixed inside.

[0007] The container has a movable plate and a fixed plate installed on its front and rear sides, respectively. The front and rear sides of the container are fixed to the movable plate and the fixed plate, respectively. The container is flexibly designed. A fixed frame is installed in the middle of the front side of the movable plate. A cylinder is installed in the middle of the fixed frame. The output end of the cylinder is installed on the movable plate.

[0008] The fixed plate is fixed with positioning rods at its four corners, and the positioning rods pass through the four corners of the movable plate to form a sliding plug-in connection.

[0009] The cylinder has a sleeve rod installed on the fixed bracket on the outside of the cylinder and a sleeve installed on the outside of the output end of the cylinder. The sleeve rod is located inside the sleeve and is telescopically connected.

[0010] The container has a vent pipe fixed to the top, which passes through a movable plate. A sealing plug is installed at the opening of the vent pipe, and a seat plate is fixed to the outside of the sealing plug. A bracket is installed on the movable plate outside the vent pipe, and a second cylinder is installed on the bracket. The output end of the second cylinder is fixed to the seat plate.

[0011] The vent pipe has a flange plate installed at its end by double-ended bolts. Multiple screws are fixed on the movable plate on the outside of the vent pipe. The flange plate and screws are installed by nuts. A sliding rod is fixed to the outer end of the double-ended bolts. The sliding rod passes through the seat plate to form a sliding sleeve.

[0012] The discharge pipe has a threaded sleeve fitted at one end, a rotating block fixed at the bottom end of the threaded sleeve, and a front retaining ring and a rear retaining ring fixed at the top end of the threaded sleeve and the bottom end of the rotating block, respectively.

[0013] Among them, a sealing ring 1 is fitted on the threaded sleeve above the rotating block, and a sealing ring 2 is fitted on the discharge pipe 1 between the threaded sleeve and the front retaining ring and between the rotating block and the rear retaining ring.

[0014] Compared with the prior art, the beneficial effects of the present invention include: 1. In this invention, a container is connected to the pump chamber, and the pipeline on / off control is combined with a solenoid valve. When the pump stops, the source of urea solution is first cut off, and then the container is used to collect the residual urea solution in the pump chamber to drain the pump chamber where the impeller is located. This deprives the impeller of contact with the urea solution when it stops, so that it only comes into contact with the urea solution when it is working. This effectively slows down the corrosion rate of the impeller components by the urea solution, thereby ensuring the service life of the pump.

[0015] 2. In this invention, the impeller is arranged in an arc shape and has an axial inlet and radial outlet flow structure. When the impeller stops, there is still space in the middle for the urea liquid between adjacent impellers to flow out, which can significantly reduce the total amount of urea liquid remaining between the impellers.

[0016] 3. In this invention, the container is flexible and is equipped with a cylinder to compress and reset the container. When the container is compressed, the urea solution inside can be discharged. When the container is reset, the urea solution inside the pump chamber can be actively drawn in using negative pressure, which facilitates use.

[0017] 4. In this invention, a vent pipe is provided on the container, along with a cylinder and a sealing plug whose movement is controlled by the cylinder, so that the internal space of the container can be connected to the external space in a controllable manner. When the internal and external spaces are connected, air pressure balance can be achieved, which is beneficial for the container to reset. When closed, it can prevent urea solution from leaking out of the vent pipe when it is discharged.

[0018] 5. In this invention, a threaded sleeve is used to connect the discharge pipe and the discharge outlet. The discharge pipe does not need to be rotated during connection; the connection is achieved by rotating the threaded sleeve, which facilitates installation. Attached Figure Description

[0019] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts. Wherein: Figure 1 This is a perspective view of the present invention; Figure 2 This is a schematic diagram of the impeller configuration in this invention; Figure 3 This is a schematic diagram of the arrangement of the inhalation blade in this invention; Figure 4 This is a schematic diagram of the container setup in this invention; Figure 5 This is a schematic diagram of the positioning rod arrangement in this invention; Figure 6 This is an enlarged view of point A in this invention; Figure 7 This is an enlarged view of point B in this invention; Figure 8 This is a schematic diagram of the threaded sleeve configuration in this invention.

[0020] Reference numerals: 1. Pump body; 2. Pump head assembly; 3. Front pump head housing; 4. Rear pump head housing; 5. Pump shaft; 6. Pump chamber; 7. Inlet; 8. Outlet; 9. Front impeller plate; 10. Rear impeller plate; 11. Impeller; 12. Suction blade; 13. Through hole; 14. Suction pipe; 15. Solenoid valve one; 16. Discharge pipe one; 17. Diverter pipe; 18. Container; 19. Connecting pipe; 20. Discharge pipe two; 21. Solenoid valve two; 22. Solenoid valve three; 23. Fixing 24. Plate; 25. Movable plate; 26. Positioning rod; 27. Fixing frame; 28. Cylinder 1; 29. ​​Sleeve; 30. Sleeve rod; 31. Threaded sleeve; 32. Rotary block; 33. Front retaining ring; 34. Rear retaining ring; 35. Sealing ring 1; 36. Sealing ring 2; 37. Housing; 38. Angle plate; 39. Vent pipe; 40. Flange plate; 41. Screw; 42. Double-ended bolt; 43. Slide rod; 44. Seat plate; 45. Sealing plug; 46. Bracket; 47. Cylinder 2. Detailed Implementation

[0021] It is readily understood that, based on the technical solution of this invention, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of this invention.

[0022] According to one embodiment of the present invention, Figures 1-4 As shown.

[0023] A urea filling pump for a vehicle includes a pump body 1, with a pump head assembly 2 mounted on the front end of the pump body 1. The pump head assembly 2 includes a front pump head housing 3 and a rear pump head housing 4, which are fixedly connected by bolts, with a pump chamber 6 reserved between them. A front wheel plate 9 and a rear wheel plate 10 are installed in the pump chamber 6, and a plurality of equally spaced arc-shaped impellers 11 are fixed between the front wheel plate 9 and the rear wheel plate 10. A through hole 13 is pre-set in the middle of the front wheel plate 9, and a plurality of equally spaced suction blades 12 are fixed inside the through hole 13. A pump shaft 5 is installed in the middle of the rear wheel plate 10, and the pump shaft 5 is fixedly connected to the output end of the pump body 1. An inlet 7 aligned axially with the through hole 13 is opened in the middle of the front side of the front pump head housing 3, and an outlet 8 aligned radially with the through hole 13 is opened in the middle bottom of the front pump head housing 3.

[0024] A suction pipe 14 is connected to the inlet 7, and a solenoid valve 15 is installed on the suction pipe 14 via bolts and a flange. A discharge pipe 16 is connected to the outlet 8, and a discharge pipe 20 is installed below the discharge pipe 16. Both the discharge pipe 16 and the discharge pipe 20 are three-way structures. One two-way port of the discharge pipe 16 and one two-way port of the discharge pipe 20 are connected by an integrally formed diverter pipe 17. A container 18 is installed on the side of the diverter pipe 17. Connecting pipes 19 are fixed to both the upper and lower ends of the container 18. Solenoid valves 21 and 32 are respectively installed on the pipe openings of the upper and lower connecting pipes 19 via bolts and flanges. Solenoid valves 21 and 32 are then connected to the three-way ports of the discharge pipe 16 and the discharge pipe 20 via bolts and flanges, respectively.

[0025] In operation, open solenoid valve 15 and simultaneously start pump body 1. When pump body 1 is working, the output end drives pump shaft 5 to rotate. Since pump shaft 5 is fixedly connected to impeller 11, it in turn drives impeller 11 to rotate. After solenoid valve 15 is opened, urea solution in the urea tank flows into pump chamber 6 through suction pipe 14 under gravity. Impeller 11 drives the urea solution in pump chamber 6 to rotate, while suction blade 12, in conjunction with impeller 11, continuously draws in urea solution from inlet 7 and sends the urea solution in pump chamber 6 out from outlet 8, creating a continuous pumping effect.

[0026] Urea solution discharged from outlet 8 is transported outward through outlet pipe 16, diversion pipe 17, and outlet pipe 20. One port of outlet pipe 20 is then connected to the vehicle's urea filling port for filling. After filling, pump body 1 is stopped and solenoid valve 15 is closed simultaneously. The stop of pump body 1 causes impeller 11 to stop rotating, terminating pumping. At this time, solenoid valve 21 is opened, and the remaining urea solution in pump chamber 6 flows into container 18 through connecting pipe 19 under gravity, essentially emptying the urea solution in pump chamber 6. The components in pump chamber 6 (such as impeller 11, front wheel plate 9, rear wheel plate 10, and related connecting parts and seals) are no longer immersed in urea solution, thus shortening the contact time between the pump head assembly 2 and urea solution. This ensures that the pump only contacts urea solution during operation and is disconnected when not in operation, thereby slowing down the corrosion rate of internal components by urea solution and extending the service life of the filling pump.

[0027] In this embodiment, see Figures 1-8The container 18 has a movable plate 24 and a fixed plate 23 installed on its front and rear sides, respectively. Positioning rods 25 are fixed at the four corners of the fixed plate 23, passing through the four corners of the movable plate 24 and forming a sliding connection. The front and rear surfaces of the container 18 are bonded to the movable plate 24 and the fixed plate 23 respectively using adhesive. The container 18 is made of a flexible material (thermoplastic polyurethane elastomer). A fixed frame 26 is installed in the middle of the front side of the movable plate 24. A cylinder 27 is bolted to the middle of the fixed frame 26, and the output end of the cylinder 27 abuts against the movable plate 24 and is fixed with bolts. A sleeve 29 is bolted to the fixed frame 26 outside the cylinder 27. A sleeve 28 is installed outside the output end of the cylinder 27, and the sleeve 29 is telescopically fitted into the sleeve 28.

[0028] After solenoid valve 21 opens, the residual urea solution in pump chamber 6 enters container 18 through discharge pipe 16. The urea solution in container 18 needs to be drained periodically to ensure sufficient space for the next use. The urea solution in container 18 can be drained externally (outside the filling pump and its pipeline) or internally (inside the filling pump and its pipeline). This scheme uses internal drainage, which is performed during the next filling. During the next filling, solenoid valve 15 opens, pump body 1 operates, solenoid valve 21 closes, solenoid valve 3 opens, and cylinder 27 operates simultaneously. Its output pushes movable plate 24 towards fixed plate 23, compressing the flexible container 18 and reducing its internal space. Under pressure, the internal urea solution is sent from the opened solenoid valve 3 22 into discharge pipe 20. When the output of cylinder 27 reaches its maximum stroke, solenoid valve 3 22 closes. When pump chamber 6 is emptied after this filling is completed, solenoid valve 15 is closed, solenoid valve 21 is opened, cylinder 27 is reset, and movable plate 24 is pulled away from fixed plate 23, so that the internal volume of container 18 is increased. On the one hand, it provides enough space to accommodate the urea solution in pump chamber 6, and on the other hand, it generates a negative pressure suction effect to better draw the urea solution in pump chamber 6 into container 18.

[0029] A vent pipe 38 is fixed to the top of container 18, passing through movable plate 24. A flange plate 39 is mounted to the end of the vent pipe 38 via double-ended bolts 41. Multiple screws 40 are fixed to the movable plate 24 outside the vent pipe 38. The flange plate 39 and the screws 40 are connected by nuts. A sliding rod 42 is integrally formed and fixed to the outer end of the double-ended bolts 41. A seat plate 43 is slidably sleeved on the sliding rod 42. A sealing plug 44 is fixed to the side of the seat plate 43 facing container 18, and the sealing plug 44 is sealed within the vent pipe 38. A bracket 45 is bolted to the movable plate 24 outside the flange plate 39. A second cylinder 46 is bolted to the bracket 45. The output end of the second cylinder 46 abuts against the seat plate 43 and is fixed by bolts.

[0030] When solenoid valve 15 and solenoid valve 32 are closed and solenoid valve 21 is opened to vent pump chamber 6, the limited volume of the pipeline from pump chamber 6 to container 18, coupled with the large internal space of container 18, can cause pressure to be drawn in from the diversion pipe 17 or even discharge pipe 20 when container 18 is reset and opened by the movable plate 24. If a filling gun is also installed at the end of discharge pipe 20, the closed structure of the internal pipeline of the filling gun will result in a relatively sealed internal space. Container 18 may not be able to reset completely due to its own capacity being greater than the internal space, and may even tear under the forced push of cylinder 127. The sealing plug 44 solves this problem: during venting, cylinder 246 moves the seat plate 43, pulling the sealing plug 44 out of the vent pipe 38, connecting the inside of container 18 and the space from pump chamber 6 to container 18 with the outside. When container 18 resets, air can be drawn in from the outside to achieve complete reset. After container 18 is reset, control cylinder 2 46 pushes the sealing plug 44 to re-seal the vent pipe 38, preventing urea solution from leaking out of the vent pipe 38 when the contents of container 18 are discharged.

[0031] A threaded sleeve 30 is fitted onto one opening of the discharge pipe 16. A rotating block 31 is integrally fixed to the bottom end of the threaded sleeve 30. A front retaining ring 32 and a rear retaining ring 33 are fixed to the top of the threaded sleeve 30 and the bottom of the rotating block 31, respectively. A sealing ring 34 is fitted onto the threaded sleeve 30 above the rotating block 31. Sealing rings 35 are fitted onto the discharge pipe 16 between the threaded sleeve 30 and the front retaining ring 32, and between the rotating block 31 and the rear retaining ring 33. When connecting the discharge pipe 16 to the discharge outlet 8, the threaded sleeve 30 is screwed into the discharge outlet 8, engaging with the internal threads to achieve connection. During the connection process, the threaded sleeve 30 rotates while the discharge pipe 16 as a whole does not need to rotate, facilitating pipeline connection operations.

[0032] A housing 36 is installed below the pump body 1. The container 18 and the diversion pipe 17 are both located inside the housing 36. The discharge pipe 16 and the discharge pipe 20 both pass through the housing 36. A corner plate 37 is fixed to the middle left side of the housing 36, and the fixing bracket 26 is fixedly connected to the corner plate 37 by bolts. The housing 36 is used to provide isolation and protection for the internal components (especially the container 18 and its driving components, such as cylinder 27 and cylinder 46).

[0033] The technical scope of this invention is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the protection scope of this invention.

Claims

1. A urea filling pump for a vehicle urea filling machine, comprising a pump body assembly, characterized in that, The pump body assembly is provided with an inlet (7) and an outlet (8). A suction pipe (14) is connected to the inlet (7). A solenoid valve (15) is installed on the suction pipe (14). A discharge pipe (16) is connected to the outlet (8). A discharge pipe (20) is installed below the discharge pipe (16). Both the discharge pipe (16) and the discharge pipe (20) are three-way connections. A diversion pipe (17) is connected to the two-way port of the discharge pipe (16) and the two-way port of the discharge pipe (20). A container (18) is installed on the side of the diversion pipe (17). Connecting pipes (19) are fixed at both the upper and lower ends of the container (18). Solenoid valves (21) and (22) are installed at the pipe openings of the upper and lower connecting pipes (19). Solenoid valves (21) and (22) are connected to the three-way ports of the discharge pipe (16) and the discharge pipe (20).

2. The urea filling pump for a vehicle urea filling machine according to claim 1, characterized in that, The pump body assembly includes a pump body (1), and a pump head assembly (2) is installed at the front end of the pump body (1). The pump head assembly (2) includes a front pump head shell (3) and a rear pump head shell (4). A pump cavity (6) is reserved between the front pump head shell (3) and the rear pump head shell (4). A front wheel plate (9) and a rear wheel plate (10) are installed in the pump cavity (6). Multiple impellers (11) with equal spacing are fixed between the front wheel plate (9) and the rear wheel plate (10). The impellers (11) are arranged in an arc shape. A through hole (13) is preset in the middle of the front wheel plate (9). A pump shaft (5) is installed in the middle of the rear wheel plate (10). The pump shaft (5) is fixedly connected to the output end of the pump body (1). The inlet (7) is set at the middle of the front side of the front pump head shell (3) and axially aligned with the through hole (13). The outlet (8) is set at the bottom middle of the front pump head shell (3) and radially aligned with the through hole (13).

3. The urea filling pump for a vehicle urea filling machine according to claim 2, characterized in that, Multiple suction blades (12) are fixed at equal intervals inside the through hole (13).

4. The urea filling pump for a vehicle urea filling machine according to claim 1, characterized in that, The container (18) is equipped with a movable plate (24) and a fixed plate (23) on its front and rear sides respectively. The front and rear sides of the container (18) are fixed to the movable plate (24) and the fixed plate (23) respectively. The container (18) is flexibly set. A fixed frame (26) is installed in the middle of the front side of the movable plate (24). A cylinder (27) is installed in the middle of the fixed frame (26). The output end of the cylinder (27) is installed with the movable plate (24).

5. A urea filling pump for a vehicle urea filling machine according to claim 4, characterized in that, The four corners of the fixed plate (23) are fixed with positioning rods (25), and the positioning rods (25) pass through the four corners of the movable plate (24) to form a sliding plug-in connection.

6. A urea filling pump for a vehicle urea filling machine according to claim 4, characterized in that, A sleeve rod (29) is installed on the fixing bracket (26) on the outside of the cylinder (27). A sleeve (28) is installed on the outside of the output end of the cylinder (27). The sleeve rod (29) is located inside the sleeve (28) and is telescopically connected.

7. A urea filling pump for a vehicle urea filling machine according to claim 4, characterized in that, The container (18) is fixed with a vent pipe (38) at the top. The vent pipe (38) passes through the movable plate (24). A sealing plug (44) is installed at the opening of the vent pipe (38). A seat plate (43) is fixed on the outside of the sealing plug (44). A bracket (45) is installed on the movable plate (24) outside the vent pipe (38). A cylinder (46) is installed on the bracket (45). The output end of the cylinder (46) is fixed to the seat plate (43).

8. A urea filling pump for a vehicle urea filling machine according to claim 7, characterized in that, The end of the vent pipe (38) is fitted with a flange plate (39) by a double-ended bolt (41). Multiple screws (40) are fixed on the movable plate (24) on the outside of the vent pipe (38). The flange plate (39) and the screws (40) are installed by nuts. A sliding rod (42) is fixed to the outer end of the double-ended bolt (41). The sliding rod (42) passes through the seat plate (43) to form a sliding sleeve.

9. A urea filling pump for a vehicle urea filling machine according to claim 1, characterized in that, A threaded sleeve (30) is fitted onto one end of the discharge pipe (16). A rotating block (31) is fixed to the bottom end of the threaded sleeve (30). A front retaining ring (32) and a rear retaining ring (33) are fixed to the top end of the threaded sleeve (30) and the bottom end of the rotating block (31) of the discharge pipe (16).

10. A urea filling pump for a vehicle urea filling machine according to claim 9, characterized in that, A sealing ring 1 (34) is fitted on the threaded sleeve (30) above the rotating block (31), and a sealing ring 2 (35) is fitted on the discharge pipe 1 (16) between the threaded sleeve (30) and the front retaining ring (32) and between the rotating block (31) and the rear retaining ring (33).

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