CN110552827B - Oil inlet valve for high-pressure oil pump and corresponding high-pressure oil pump - Google Patents
Oil inlet valve for high-pressure oil pump and corresponding high-pressure oil pump Download PDFInfo
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- CN110552827B CN110552827B CN201810561426.2A CN201810561426A CN110552827B CN 110552827 B CN110552827 B CN 110552827B CN 201810561426 A CN201810561426 A CN 201810561426A CN 110552827 B CN110552827 B CN 110552827B
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- inlet valve
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- oil inlet
- fuel
- guide
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
- F02M59/46—Valves
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
- Rotary Pumps (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
Abstract
The invention discloses an inlet valve (3) for a high-pressure oil pump, comprising: an oil inlet valve core (32); and an oil inlet valve seat (31) which comprises a receiving cavity (33) used for receiving the oil inlet valve core (32), wherein a sealing part (35) which is in sealing contact with the oil inlet valve core (32) when the oil inlet valve (3) is closed is formed in the receiving cavity (33), a guide structure is further arranged in the receiving cavity (33), is positioned above the sealing part (35), and is constructed to guide the oil inlet valve core (32) to move away from the sealing part (35) along a preset path when the oil inlet valve (3) is opened. A corresponding high pressure oil pump is also disclosed. By controlling the movement path of the oil inlet valve core, the oil inlet valve can work more stably and controllably, so that the abrasion to the reset spring, the oil inlet valve seat and/or the oil inlet valve core can be reduced, the oil inlet valve is improved, and the working stability of the high-pressure oil pump is further improved.
Description
Technical Field
The invention relates to an inlet valve for a high-pressure oil pump and to a corresponding high-pressure oil pump.
Background
The high-pressure oil pump of the engine is used for pressurizing fuel from low pressure to high pressure and then delivering the pressurized fuel to the common rail. The high-pressure oil pump is widely used in a plunger pump mode at present. The plunger pump realizes oil absorption and oil pressing by means of the volume periodic change of the sealed working cavity through the reciprocating motion of the plunger in the plunger sleeve. The plunger pump has the advantages of high rated pressure, compact structure, high efficiency, convenient flow regulation and the like.
In a high-pressure oil pump, an oil feed valve includes an oil feed valve seat and an oil feed spool that is movable relative to the oil feed valve seat. In existing inlet valves, the inlet spool is typically spherical. When the inlet valve is open, the inlet spool may move and/or rotate in any direction due to the turbulence of the fuel around the inlet spool, which may lack the constraint on the spherical inlet spool, resulting in uncontrolled movement. The uncontrollable motion can make the reset spring of elastic support oil feed case wear out on the one hand, damages even, and on the other hand oil feed case also can suffer uncontrollable wearing and tearing with the oil feed disk seat, finally can lead to the inlet valve to produce the leakage. Furthermore, in the case of a high-speed operation of the inlet valve, the fuel flow and the closing of the valve become less stable, which also makes the function of the high-pressure oil pump unstable, making such an inlet valve unsuitable for use in a high-speed oil pump.
Therefore, there is a strong need for improvements to existing high pressure oil pumps, particularly their inlet valves, to improve reliability and operating characteristics.
Disclosure of Invention
The object of the present invention is to provide an inlet valve for a high-pressure oil pump and a corresponding high-pressure oil pump which are capable of overcoming at least one of the abovementioned disadvantages.
According to a first aspect of the present invention, there is provided an oil feed valve for a high-pressure oil pump, comprising: an oil inlet valve core; and the oil inlet valve seat comprises a receiving cavity used for receiving the oil inlet valve core, a sealing part which is in sealing contact with the oil inlet valve core when the oil inlet valve is closed is formed in the receiving cavity, and a guiding structure is further arranged in the receiving cavity, is positioned above the sealing part and is constructed to guide the oil inlet valve core to move away from the sealing part along a preset path when the oil inlet valve is opened.
According to a second aspect of the present invention, there is provided a high-pressure oil pump including the oil feed valve.
According to the invention, the oil inlet valve can work more stably and controllably by controlling the movement path of the oil inlet valve core, so that the abrasion to the reset spring, the oil inlet valve seat and/or the oil inlet valve core can be reduced, the oil inlet valve is improved, and the working stability of the high-pressure oil pump is further improved.
Drawings
The principles, features and advantages of the present invention may be better understood by describing the invention in more detail below with reference to the accompanying drawings. The drawings comprise:
fig. 1 shows a longitudinal sectional view of a high pressure oil pump according to an exemplary embodiment of the present invention.
Fig. 2 is an enlarged sectional view showing a structural detail at one oil feed valve of the high-pressure oil pump shown in fig. 1.
Fig. 3 illustrates a perspective cross-sectional view of an oil feed valve according to a preferred exemplary embodiment of the present invention.
Fig. 4 shows the flow path of fuel through the inlet valve when the inlet valve is open.
Fig. 5 schematically illustrates a top view of an oil feed spool in a receiving cavity.
FIG. 6 schematically illustrates an oil feed valve according to an exemplary embodiment of the present invention.
Fig. 7 schematically shows an oil feed valve according to another exemplary embodiment of the present invention.
FIG. 8 schematically illustrates an oil feed valve according to yet another exemplary embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and several embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the scope of the invention.
Fig. 1 shows a longitudinal sectional view of a high pressure oil pump according to an exemplary embodiment of the present invention. As shown in fig. 1, the high-pressure oil pump includes a cam drive mechanism 1 and two plunger pumps 2 driven by the cam drive mechanism 1. The plunger pump 2 includes a plunger barrel 21 and a plunger 22 reciprocating inside the plunger barrel 21. The inlet valve 3 is disposed above the plunger 22 to receive fuel to be pressurized from a low-pressure oil pump, such as a vane pump.
Fig. 2 shows a detail of the structure at one oil feed valve 3 of the high-pressure oil pump shown in fig. 1 in an enlarged sectional view.
As shown in fig. 2, the oil feed valve 3 includes an oil feed valve seat 31 and an oil feed spool 32. A receiving chamber 33 for receiving the oil inlet spool 32 is formed in the oil inlet valve seat 31. The return spring 34 acts on the oil inlet spool 32 from above. In the closed state of the inlet valve 3, a portion of the inlet spool 32 sealingly abuts against a sealing portion 35 in the receiving chamber 33 of the inlet valve seat 31, so that fuel cannot continue downstream through the inlet valve 3 to the fuel chamber. In the open state of the inlet valve 3, the inlet spool 32 is moved away from the sealing portion 35 in the receiving chamber 33 against the force of the return spring 34 to form a gap therebetween through which fuel can pass, so that fuel can continue to flow downstream into the fuel chamber through the inlet valve 3 and through the fuel passage 36 to be pressurized.
According to the present invention, a guide structure is further provided in the receiving chamber 33 above the seal portion 35 so as to move the path of the oil feed spool 32 away from the seal portion 35 in a restricted manner when the oil feed valve 3 is opened. By this guiding action, the movement path of the inlet spool 32 can be controlled, so that the working performance of the high-pressure oil pump can be improved and the service life thereof can be prolonged.
Fig. 3 shows a perspective cross-sectional view of an oil feed valve 3 according to a preferred exemplary embodiment of the present invention. As shown in fig. 3, a guide structure is provided inside the receiving chamber 33. According to the embodiment shown in fig. 3, the guide structure is configured to include a plurality of guide protrusions 37 arranged circumferentially spaced apart from each other, the guide protrusions 37 radially restricting the oil feed spool 32 from different angles, so that the oil feed spool 32 can move within the receiving chamber 33 away from the seal portion 35 only along a predetermined path defined by the guide structure when the oil feed valve 3 is open.
According to an exemplary embodiment of the present invention, the plurality of guide protrusions 37 are preferably uniformly distributed in the circumferential direction, so that the oil feed spool 32 can be more stably guided.
According to an exemplary embodiment of the invention, the surface of the guide projection 37 facing the oil inlet spool 32, i.e. the radially inner side thereof (i.e. the surface for guiding the oil inlet spool 32), is configured to fit with a corresponding outer surface of the oil inlet spool 32. In the case where the oil feed spool 32 is spherical as shown in fig. 2 to 3, for example, the surface of the guide projection 37 facing the oil feed spool 32 is configured in a concave arc shape.
According to an exemplary embodiment of the present invention, as shown in particular in fig. 2-3, a communication channel 38 to the receiving chamber 33 is provided downstream adjacent to the sealing portion 35, i.e. within the receiving chamber 33 adjacent to the sealing portion 35, which communication channel 38 is in fluid communication with the fuel channel 36. When the inlet valve 3 is opened, the inlet valve spool 32 moves away from the seal portion 35, so that the fuel flows into the communication passage 38 through the gap between the inlet valve spool 32 and the seal portion 35 and then flows into the fuel passage 36. The communication passage 38 is configured here as a platform structure that exposes the opening of the fuel passage 36. Fig. 4 shows such a flow path, which is indicated by the curved arrow a.
According to a preferred exemplary embodiment of the present invention, an oil outlet passage 39 is provided on the oil inlet valve seat 31, and one end of the oil outlet passage 39 communicates with the fuel passage 36 and the other end extends to the open end of the receiving chamber 33 of the oil inlet valve seat 31. In this case, the pressurized fuel may flow toward the outlet valve through the fuel passage 36 and then through the outlet passage 39.
According to a preferred exemplary embodiment of the present invention, the oil outlet passage 39 is defined by a recessed area between adjacent guide protrusions 37. This can be seen more clearly in the drawings that will be described below. The design mode is simple and reliable, and is convenient to process. Preferably, the fuel passages 36 and the outlet passages 39 are axially aligned with each other so that the corresponding flow resistance is reduced and the pressurized fuel flows more smoothly to the outlet valve.
Fig. 5 schematically shows a top view of the oil feed spool 32 in the receiving chamber 33. As shown in fig. 5, three guide protrusions 37 are provided in the receiving chamber 33, and the surface of the guide protrusion 37 facing the oil inlet spool 32 is concavely curved. The guide protrusion 37 radially restricts the oil inlet spool 32 from three different directions, so that the oil inlet spool 32 can move within the receiving chamber 33 only along the path defined by the guide protrusion 37.
Of course, the number of the guide projections 37 is not limited thereto as long as the oil feed spool 32 can be forced to move along a predetermined path within the receiving chamber 33.
Although the flow path design of the fuel flowing to the fuel passage 36 through the communication passage 38 when the inlet valve 3 is opened has been described above, the present invention is obviously not limited thereto. For example, as shown in fig. 6, at least one through oil passage 40 radially spaced from the receiving chamber 33 may also be formed in the oil-intake valve seat 31. In this case, when the inlet valve 3 is opened, the fuel flows into the receiving chamber 33 first, and thus can flow into the area between the inlet valve 3 and the outlet valve through a portion that is not blocked by the inlet valve core 32, for example, a portion between the adjacent guide protrusions 37, and then the fuel can flow toward the fuel chamber through such a through oil passage 40 to be pressurized. At this time, the through oil passage 40 preferably also serves as an oil outlet passage.
According to another alternative embodiment of the invention, as shown in fig. 7, the cross section of the receiving chamber 33 is configured to match the cross section of the oil inlet spool 32, the circumferential wall of the receiving chamber 33 itself radially confining the oil inlet spool 32. In this case, a communication passage 38, which is capable of introducing fuel when the inlet valve 3 is opened, is schematically shown by a broken line, is formed in the inlet valve seat 31 and extends to the through oil passage 40.
According to another alternative embodiment of the present invention, as shown in fig. 8, the receiving chamber 33 includes a restricting portion 41 that radially restricts the oil feed spool 32 and an additional portion 42, the additional portion 42 being configured as the oil outlet passage 39 as shown in fig. 4 and 5, the oil outlet passage 39 communicating with both the communication passage 38 and the fuel passage 36.
Although the invention is described above in terms of a spherical oil inlet spool, the concepts of the invention can be extended to other types of oil inlet spools as well.
The invention can make the oil inlet valve work more stably and controllably by controlling the movement path of the oil inlet valve core, thereby reducing the abrasion to the reset spring, the oil inlet valve seat and/or the oil inlet valve core, improving the oil inlet valve and further improving the working stability of the high-pressure oil pump.
Other advantages and alternative embodiments of the present invention will be apparent to those skilled in the art. Therefore, the invention in its broader aspects is not limited to the specific details, representative structures, and illustrative examples shown and described. On the contrary, various modifications and substitutions may be made by those skilled in the art without departing from the basic spirit and scope of the invention.
Claims (9)
1. An inlet valve (3) for a high-pressure oil pump, comprising:
an oil inlet valve core (32); and
an oil inlet valve seat (31) including a receiving chamber (33) for receiving an oil inlet valve element (32), a sealing portion (35) that is in sealing contact with the oil inlet valve element (32) when the oil inlet valve (3) is closed being formed in the receiving chamber (33),
wherein a guide structure is further arranged in the receiving cavity (33), is positioned above the sealing part (35), and is configured to guide the oil inlet valve core (32) to move away from the sealing part (35) along a preset path when the oil inlet valve (3) is opened; and
the oil inlet valve core (32) is spherical, and the guide surface of the guide structure for guiding the oil inlet valve core (32) is in a concave arc shape.
2. Oil inlet valve (3) according to claim 1,
the guide structure is configured to include a plurality of guide protrusions (37) arranged circumferentially spaced apart from each other, the plurality of guide protrusions (37) radially restricting the oil feed spool (32) from different angles.
3. Oil inlet valve (3) according to claim 2,
the plurality of guide protrusions (37) are uniformly distributed in the circumferential direction.
4. Oil feed valve (3) according to claim 2 or 3,
the guide surface of the guide projection (37) is configured to fit with a corresponding surface of the oil inlet spool (32).
5. Oil feed valve (3) according to any one of claims 1 to 3,
a communication passage (38) is formed in the receiving chamber (33) at a position adjacent to the seal portion (35), the communication passage (38) fluidly communicating the receiving chamber (33) with a fuel passage (36) formed in the fuel inlet valve seat (31) so that fuel can flow to the fuel chamber through the communication passage (38) and the fuel passage (36) to be pressurized when the fuel inlet valve (3) is opened.
6. Oil feed valve (3) according to claim 5,
the oil inlet valve seat (31) is further provided with an oil outlet channel (39), and the oil outlet channel (39) is communicated with the fuel channel (36) in a fluid mode, so that when the oil inlet valve (3) is opened, pressurized fuel can flow to the oil outlet valve through the fuel channel (36) and the oil outlet channel (39).
7. Oil inlet valve (3) according to claim 6,
the oil outlet channel (39) is arranged in alignment with the fuel oil channel (36); and/or
The oil outlet channel (39) is at least partially defined by a recessed area between adjacent guide protrusions (37).
8. Oil feed valve (3) according to claim 6,
the fuel passage (36) opens into a receiving chamber (33); and/or
The communication channel (38) is configured as a platform structure.
9. A high-pressure oil pump, characterized in that it comprises an inlet valve (3) according to any one of claims 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810561426.2A CN110552827B (en) | 2018-06-04 | 2018-06-04 | Oil inlet valve for high-pressure oil pump and corresponding high-pressure oil pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810561426.2A CN110552827B (en) | 2018-06-04 | 2018-06-04 | Oil inlet valve for high-pressure oil pump and corresponding high-pressure oil pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110552827A CN110552827A (en) | 2019-12-10 |
| CN110552827B true CN110552827B (en) | 2022-11-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810561426.2A Active CN110552827B (en) | 2018-06-04 | 2018-06-04 | Oil inlet valve for high-pressure oil pump and corresponding high-pressure oil pump |
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