High-pressure small-flow multi-connection plunger pump

Abstract

The utility model discloses a high pressure small flow multi -connected plunger pump, including lower pump body and drive shaft, and the one end of drive shaft extension lower pump body is connected with motor, and the upper end surface of lower pump body is connected with upper pump body, is provided with cam on drive shaft, be provided with plunger sleeve on upper pump body, and the oil hole is seted up on plunger sleeve, and the oil inlet that is linked with oil hole is seted up on upper pump body, be provided with plunger in the sliding of plunger sleeve, and the end of plunger is provided with baffle, and the end surface between baffle and plunger sleeve is provided with the first spring of setting on plunger, and plunger sleeve is cooperated with sealing flap, and sealing flap is abutted with second spring, be provided with the oil channel of being linked with second spring installation department in upper pump body, and the oil outlet that is linked with oil channel is seted up on upper pump body, in the utility model discloses, under the action of second spring, the oil liquid that discharges from sealing flap has certain pressure, makes the oil liquid that sprays from oil outlet has certain pressure, can form effective oil injection angle in oil injection port.

Description

Technical Field

[0001] This utility model belongs to the field of plunger pump technology and relates to a high-pressure, low-flow multi-plunger pump. Background Technology

[0002] In a vehicle's ignition system, precise control of ignition pressure and flow requires a mechanical pump for fuel supply. The required ignition fuel quantity varies depending on the environment, especially in extreme conditions such as high altitudes, where safer and faster starting and response are crucial. While traditional mechanical pumps are low-cost and easy to maintain, they provide insufficient fuel pressure, and the injectors cannot achieve an effective injection angle, leading to unstable fuel supply. To address these technical issues, a high-pressure, low-flow multi-piston pump is urgently needed. Utility Model Content

[0003] To address the aforementioned problems, this invention proposes a high-pressure, low-flow multi-piston pump, which effectively solves the problem in the prior art where the fuel pressure is insufficient to form an effective injection angle.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a high-pressure, low-flow multi-piston pump, including a lower pump body and a drive shaft rotatably connected to the lower pump body, a motor being connected to one end of the drive shaft extending out of the lower pump body, an upper pump body being connected to the lower pump body with an open upper end face, and a cam being provided on the drive shaft. The upper pump body is provided with a plunger sleeve that is aligned with the cam. The plunger sleeve has an oil passage hole. An oil inlet connected to the oil passage hole is provided on one side of the upper pump body. A plunger is slidably disposed inside the plunger sleeve. A baffle is provided at one end of the plunger that extends out of the plunger sleeve. A first spring sleeved on the plunger is provided between the baffle and the end face of the plunger sleeve. The plunger sleeve is inserted into one end of the upper pump body and is fitted with a sealing valve. The sealing valve abuts against a second spring disposed in the upper pump body. The upper pump body is provided with an oil passage that communicates with the installation location of the second spring. An oil outlet that communicates with the oil passage is opened on one side of the upper pump body.

[0005] Furthermore, multiple cams are arranged side by side on the drive shaft; the number of plunger sleeves, plungers, and sealing valves is the same as the number of cams and corresponds one-to-one.

[0006] Furthermore, an annular groove is provided at the position of the upper pump body corresponding to the oil passage hole, and the oil passage holes of adjacent plunger sleeves are interconnected, and the oil inlet is connected to one of the annular grooves.

[0007] Furthermore, the upper pump body is provided with an installation cavity for inserting a plunger sleeve, and a limiting plate for limiting the plunger sleeve is fixed at the opening of the installation cavity. The limiting plate is provided with holes for the plunger and the first spring to pass through. The sealing valve is installed at the bottom of the mounting cavity; one end of the second spring abuts against the bottom surface of the mounting cavity, and the other end abuts against the sealing valve.

[0008] Furthermore, sealing rings are provided on the outer surfaces of both ends of the plunger sleeve.

[0009] Furthermore, the sealing valve includes a sealing part with a conical surface, a guide part, and a limiting part. The guide part and the limiting part are respectively disposed at both ends of the sealing part. The guide part is slidably disposed inside the plunger sleeve, and the limiting part is inserted into the second spring. The end face of the plunger sleeve is provided with a sealing surface that matches the conical surface of the sealing part.

[0010] Furthermore, a sealing end cover connected to the lower pump body is provided at one end of the drive shaft that extends out of the lower pump body. The sealing end cover has a sealing hole through which the end of the drive shaft passes, and an oil seal is provided in the sealing hole. The motor is mounted on the sealing end cover.

[0011] Compared with the prior art, the present invention has the following beneficial effects: In this invention, the motor drives the drive shaft to rotate and drives the plunger to force the oil entering the plunger sleeve out of the sealing valve. Due to the presence of the second spring, the oil discharged from the sealing valve has a certain pressure, which in turn makes the oil sprayed from the oil outlet have a certain pressure, so that an effective spray angle can be formed at the oil spray nozzle. In this invention, the structure of multiple cams, plunger sleeves, and plungers allows for the adjustment of the motor speed to obtain the required flow rate of pressurized oil, thus achieving stable oil supply. Attached Figure Description

[0012] Figure 1 This is an overall structural diagram of the present invention; Figure 2 This is a perspective view of the sealing valve in this utility model.

[0013] In the diagram: 1. Lower pump body; 2. Drive shaft; 3. Motor; 4. Upper pump body; 5. Cam; 6. Plunger sleeve; 7. Oil inlet; 8. Plunger; 9. Baffle; 10. First spring; 11. Sealing valve; 12. Second spring; 13. Oil outlet; 14. Annular groove; 15. Mounting cavity; 16. Limiting plate; 17. Sealing part; 18. Guide part; 19. Limiting part; 20. Sealing end cover; 21. Oil seal. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] like Figure 1 As shown, this utility model proposes a high-pressure, low-flow multi-piston pump, including a lower pump body 1 and a drive shaft 2. The lower pump body 1 has a cavity, and bearings are installed at both ends of the drive shaft 2. The bearings are located at both ends of the cavity, allowing the drive shaft 2 to rotate within the lower pump body 1. One end of the drive shaft 2 extends out of the lower pump body 1 and is connected to a motor 3. The upper end face of the lower pump body 1 is open and connected to an upper pump body 4. A closed groove is opened on the side of the upper pump body 4 facing the lower pump body 1, and a sealing gasket is installed in the groove. The upper pump body 4 and the lower pump body 1 are fixedly connected by bolts. The sealing gasket prevents the oil in the cavity from flowing out between the upper pump body 4 and the lower pump body 1. A cam 5 is integrally formed on the drive shaft 2. A plunger sleeve 6 is provided on the upper pump body 4, which is aligned with the cam 5. The plunger sleeve 6 is located in the radial direction of the drive shaft 2. An oil passage hole communicating with its internal space is opened on the outer ring surface of the plunger sleeve 6. Multiple oil passage holes are evenly distributed around the axis of the plunger sleeve 6. An oil inlet 7 is opened on one side of the upper pump body 4. An oil passage communicating with the oil passage hole is machined along the oil inlet 7. Fuel enters from the oil inlet 7 and can enter the internal space of the plunger sleeve 6 through the oil passage and the oil passage hole. A plunger 8 is slidably arranged inside the plunger sleeve 6. A baffle 9 is integrally formed on the lower end of the plunger 8 extending from the plunger sleeve 6. A first spring 10 is installed between the baffle 9 and the end face of the plunger sleeve 6 and sleeved on the plunger 8. Under the elastic force of the first spring 10, the baffle 9 always abuts against the cam 5. The plunger sleeve 6 is inserted into one end of the upper pump body 4 and is fitted with a sealing valve 11. The sealing valve 11 abuts against a second spring 12 located inside the upper pump body 4. An oil passage is provided inside the upper pump body 4 that is connected to the installation location of the second spring 12. An oil outlet 13 connected to the oil passage is opened on one side of the upper pump body 4.

[0016] Specifically, the upper pump body 4 has an installation cavity 15 for inserting the plunger sleeve 6. A limiting plate 16 for limiting the plunger sleeve 6 is fixed to the opening of the installation cavity 15, i.e., the limiting plate 16 is connected to the upper pump body 4 by bolts. The limiting plate 16 has holes for the plunger 8 and the first spring 10 to pass through. The diameter of the holes is smaller than the outer diameter of the plunger sleeve 6 and larger than the inner diameter of the plunger sleeve 6. The installation cavity 15 is a stepped hole, and the plunger sleeve 6 is inserted into the larger diameter end of the stepped hole. The sealing valve 11 is installed in the smaller diameter end of the stepped hole. One end of the second spring 12 abuts against the bottom surface of the mounting cavity 15, and the other end abuts against the sealing valve 11. The limiting plate 16 prevents the plunger sleeve 6 from coming out of the mounting cavity 15. Moreover, during subsequent maintenance of the plunger sleeve 6, the limiting plate 16 can be removed from the upper pump body 4, and the plunger sleeve 6 can be taken out of the mounting cavity 15 for maintenance. If the plunger sleeve 6 is severely worn, a new plunger sleeve 6 can be replaced without replacing the entire upper pump body 4, thus reducing subsequent maintenance costs. Furthermore, sealing rings are provided on the outer surfaces of both ends of the plunger sleeve 6. The sealing rings can prevent fuel from leaking from both ends of the plunger sleeve 6 and maintain the seal between the ends of the plunger sleeve 6 and the mounting cavity 15. It should be noted that a through hole is provided on the bottom surface of the mounting cavity 15, and the through hole is connected to the oil passage connected to the oil outlet 13.

[0017] In this embodiment, multiple cams 5 are arranged side by side on the drive shaft 2. The number of plunger sleeves 6, plungers 8, and sealing valves 11 is the same as the number of cams 5 and corresponds one-to-one. Preferably, three cams 5 are used, and three sets of plunger sleeves 6, plungers 8, and sealing valves 11 are also arranged accordingly. During operation, each plunger sleeve 6 can provide a unit oil flow rate. The protrusions of the three cams 5 are staggered at 120°. When the motor 3 drives the drive shaft 2 to rotate, the drive plungers 8 can press oil in an alternating manner and discharge pressurized oil from the sealing valves 11. By adjusting the speed of the motor 3, the frequency of multiple plungers 8 pressing into the plunger sleeves 6 can be adjusted, thereby adjusting the amount of oil discharged from the oil outlet 13.

[0018] Preferably, an annular groove 14 is provided at the position of the upper pump body 4 corresponding to the oil passage hole, and a through hole is provided on the cavity wall of the adjacent mounting cavity 15, so that the oil passage holes of the adjacent plunger sleeves 6 are interconnected, and the oil passage machined along the oil inlet 7 is connected to one of the annular grooves 14; that is, the fuel from the oil inlet 7 can enter each plunger sleeve 6 through the oil passage, the annular groove 14 and the through hole, so as to supply the plunger 8 with subsequent oil pressure. In this embodiment, as Figure 1 as well as Figure 2As shown, the sealing valve 11 includes a sealing portion 17 with a conical surface, a guide portion 18, and a limiting portion 19. The guide portion 18 and the limiting portion 19 are respectively disposed at both ends of the sealing portion 17, and the sealing portion 17, the guide portion 18, and the limiting portion 19 are integrally formed. The guide portion 18 is slidably disposed inside the plunger sleeve 6, and the limiting portion 19 is inserted into the second spring 12. The end face of the plunger sleeve 6 is provided with a sealing surface adapted to the conical surface of the sealing portion 17. The sealing surface is the conical surface located at the port of the plunger sleeve 6. Under the elastic force of the second spring 12, the conical surface on the sealing portion 17 and the plunger sleeve 6 are connected. The sealing surface on the plug sleeve 6 can abut against the seal, preventing fuel from being discharged from the sealing valve 11 when stationary. The guide portion 18 can guide the movement of the sealing valve 11, ensuring that the conical surface on the sealing portion 17 always corresponds to the sealing surface on the plunger sleeve 6 when the sealing valve 11 moves, preventing misalignment and improving the reliability of use. A groove is milled on the outer edge of the guide portion 18, allowing fuel to pass through. Furthermore, the limiting portion 19 can prevent the second spring 12 from slipping off the sealing valve 11, further improving the reliability of the sealing valve 11.

[0019] In this embodiment, a sealing end cap 20 is bolted to the lower pump body 1 at one end of the drive shaft 2 that protrudes from the lower pump body 1. The sealing end cap 20 has a groove on its side facing the lower pump body 1, and an O-ring is installed on the groove to ensure a seal between the sealing end cap 20 and the lower pump body 1. The sealing end cap 20 has a sealing hole through which the end of the drive shaft 2 passes, and an oil seal 21 is installed in the sealing hole. The oil seal 21 is fitted onto the end of the drive shaft 2 to prevent fuel from leaking from the sealing hole. The oil seal 21 is a rotary sealing ring. The motor 3 is mounted on the sealing end cap 20. Specifically, the lower pump body 1 has a threaded hole, and both the sealing end cap 20 and the motor 3 have mounting holes. Bolts are passed through the mounting holes of the motor 3 and the sealing end cap 20 and fastened to the threaded hole on the lower pump body 1.

[0020] When the above technical solution is used: fuel enters through the inlet 7, and the fuel fills the internal space of the plunger sleeve 6 through the oil passage, annular groove 14, and oil passage hole; when pressurized fuel is required, the motor 3 is started, and the motor 3 drives the drive shaft 2 to rotate; then the cam 5 on the drive shaft 2 drives the corresponding plunger 8 to press into the internal space of the plunger sleeve 6. Due to the presence of the second spring 12 and the sealing valve 11, the fuel in the plunger sleeve 6 accumulates pressure, and the pressurized fuel pushes open the sealing valve 11, and the pressurized fuel is sprayed out from the oil passage and the outlet 13; the pressurized fuel forms an effective injection angle at the injection port, ensuring fuel supply stability; furthermore, when different flow rates of pressurized fuel are required, the speed of the motor 3 can be adjusted to obtain the required flow rate of pressurized fuel.

[0021] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-pressure, low-flow multi-piston pump, comprising a lower pump body (1) and a drive shaft (2) rotatably connected within the lower pump body (1), wherein a motor (3) is connected to one end of the drive shaft (2) extending out of the lower pump body (1), characterized in that, The upper end face of the lower pump body (1) is open and sealed to the upper pump body (4), and a cam (5) is provided on the drive shaft (2). The upper pump body (4) is provided with a plunger sleeve (6) aligned with the cam (5). The plunger sleeve (6) is provided with an oil passage hole. The upper pump body (4) is provided with an oil inlet (7) connected to the oil passage hole on one side. A plunger (8) is slidably disposed inside the plunger sleeve (6). A baffle (9) is provided at one end of the plunger (8) extending out of the plunger sleeve (6). A first spring (10) is provided between the baffle (9) and the end face of the plunger sleeve (6) and sleeved on the plunger (8). The plunger sleeve (6) is inserted into the upper pump body (4) and is fitted with a sealing valve (11). The sealing valve (11) abuts against a second spring (12) located inside the upper pump body (4). The upper pump body (4) is provided with an oil passage connected to the installation location of the second spring (12). An oil outlet (13) connected to the oil passage is opened on one side of the upper pump body (4).

2. The high-pressure, low-flow multi-piston pump according to claim 1, characterized in that: Multiple cams (5) are arranged side by side on the drive shaft (2); the number of plunger sleeves (6), plungers (8) and sealing valves (11) is the same as the number of cams (5) and corresponds one-to-one.

3. The high-pressure, low-flow multi-piston pump according to claim 2, characterized in that: An annular groove (14) is provided at the position of the upper pump body (4) corresponding to the oil passage hole, and the oil passage holes of the adjacent plunger sleeves (6) are interconnected. The oil inlet (7) is connected to one of the annular grooves (14).

4. The high-pressure, low-flow multi-piston pump according to claim 1, characterized in that: The upper pump body (4) is provided with an installation cavity (15) for inserting a plunger sleeve (6). The cavity opening of the installation cavity (15) is fixed with a limiting plate (16) for limiting the plunger sleeve (6). The limiting plate (16) is provided with holes for the plunger (8) and the first spring (10) to pass through. The sealing valve (11) is installed at the bottom of the mounting cavity (15); one end of the second spring (12) abuts against the bottom surface of the mounting cavity (15), and the other end abuts against the sealing valve (11).

5. The high-pressure, low-flow multi-piston pump according to claim 4, characterized in that: Sealing rings are provided on the outer surfaces of both ends of the plunger sleeve (6).

6. The high-pressure, low-flow multi-piston pump according to claim 1 or 4, characterized in that: The sealing valve (11) includes a sealing part (17) with a conical surface, a guide part (18) and a limiting part (19). The guide part (18) and the limiting part (19) are respectively disposed at both ends of the sealing part (17). The guide part (18) is slidably disposed in the plunger sleeve (6), and the limiting part (19) is inserted into the second spring (12). The end face of the plunger sleeve (6) is provided with a sealing surface that is adapted to the conical surface of the sealing part (17).

7. The high-pressure, low-flow multi-piston pump according to claim 1, characterized in that: The drive shaft (2) has a sealing end cover (20) connected to the lower pump body (1) at one end. The sealing end cover (20) has a sealing hole through which the end of the drive shaft (2) passes. An oil seal (21) is provided in the sealing hole. The motor (3) is mounted on the sealing end cover (20).

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