CN216866868U - Automatic flow regulating device for oil delivery pump of common rail system - Google Patents
Automatic flow regulating device for oil delivery pump of common rail system Download PDFInfo
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- CN216866868U CN216866868U CN202123137602.6U CN202123137602U CN216866868U CN 216866868 U CN216866868 U CN 216866868U CN 202123137602 U CN202123137602 U CN 202123137602U CN 216866868 U CN216866868 U CN 216866868U
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Abstract
An automatic flow regulating device of an oil transfer pump for a common rail system comprises a valve body, a slide valve spring, a regulating gasket (regulating slide valve opening pressure), a ball valve spring, a regulating screw (regulating ball valve opening pressure), a slide valve core, an O-shaped sealing ring, a limiting filter screen and a valve ball. High-pressure oil pumps with different discharge capacities are usually designed for matching different engine powers, so that oil delivery pumps with different flow rates are also required to be designed; the invention can adjust the actual output flow of the oil delivery pump through the back pressure of the oil delivery pump, and can be adapted to the design of high-pressure oil pumps with different discharge capacities. In addition, the invention has the advantages of compact structure, filtering with a filter screen, large flow regulation amplitude and the like.
Description
Technical Field
The invention relates to the technical field of development of a high-pressure oil pump in a high-pressure common-rail fuel system of a diesel engine. In particular to an automatic flow regulating device of a fuel delivery pump for a common rail system.
Background
Under the background of environmental pollution, energy crisis problems and increasingly perfect emission regulations of various countries, the injection of a high-pressure common rail fuel system is one of the main development technologies of a diesel engine at present. The common rail system is generally composed of a high-pressure oil pump, a high-pressure common rail, an oil injector and an ECU (electronic control unit). The fuel delivery pump on the high-pressure fuel pump sucks low-pressure fuel oil from the fuel tank into the high-pressure cavity of the fuel pump through filtration, high pressure is built through compression of the camshaft, the high-pressure fuel oil is stored through the common rail, and simultaneously the fuel injector injects the high-pressure fuel oil in the common rail into the combustion of the engine in the best injection timing, injection quantity, injection rate and injection mode according to signals sent by the ECU.
The flow regulating device can realize that the same oil delivery pump can meet the design requirements of oil pumps with different discharge capacities, so that the oil delivery pump has universality.
Disclosure of Invention
The purpose of the invention is as follows: in order to solve the problems, the invention designs the automatic flow regulating device of the oil delivery pump for the common rail system, which can realize the function of automatically regulating the actual output flow according to the back pressure of the oil delivery pump.
The technical scheme is as follows: an automatic flow regulating device of an oil transfer pump for a common rail system comprises a valve body, a slide valve core, a slide valve spring, a slide valve adjusting gasket (for regulating the opening pressure of the slide valve), a limiting filter screen, a ball valve spring, a regulating screw (for regulating the opening pressure of the ball valve), a ball valve ball and an O-shaped sealing ring.
Furthermore, the adjusting screw is screwed in the valve body through threads, and an O-shaped sealing ring is circumferentially arranged; the ball valve spring is arranged on the end face of the adjusting screw, one end of the ball valve spring is pre-pressed to support a ball valve ball, and the ball valve ball is sealed on the conical surface of the spool of the slide valve; the limiting filter screen is pressed in the valve body, one end of the slide valve spring is arranged on the end face of the valve body, the other end of the slide valve spring is pre-pressed on the end face of the valve core, and the valve core of the slide valve is tightly attached to the end face of the limiting filter screen; the valve body is provided with a ball valve fuel oil circulation hole and a slide valve fuel oil circulation hole. The valve body is provided with two through holes, the hole 8 is a fuel circulation hole when the ball valve works, and the hole 9 is a fuel circulation hole when the slide valve works.
Furthermore, the small end face of the valve body is communicated with an outlet of the oil transfer pump, and the valve body is circumferentially communicated with an oil inlet of the oil transfer pump; the whole adjusting device is circumferentially provided with an O-shaped sealing ring and is integrally screwed in the cavity of the oil delivery pump body.
When the oil transfer pump works normally, the back pressure pushes the spool of the slide valve, so that redundant fuel at the outlet enters the regulator through the filter screen and returns to the inlet of the oil transfer pump to form internal circulation, and the purpose of regulating the output flow of the oil transfer pump according to the back pressure is achieved.
If the pressure at the outlet of the oil delivery pump is too high (such as the situations of fine filtration blockage, pipeline bending and the like), the flow regulating capacity of the slide valve is exceeded, the safety ball valve is opened at the moment, redundant flow is discharged, and the pressure protection effect is achieved.
Has the advantages that: the automatic flow regulating device of the oil transfer pump can regulate the actual output flow of the oil transfer pump through the back pressure of the oil transfer pump, so that the same oil transfer pump meets the design of oil pumps with different discharge capacities, and the device has universality. In addition, the invention has the advantages of compact structure, filtering with a filter screen and large flow regulation amplitude.
Drawings
Fig. 1 is a schematic structural diagram of components of the automatic flow regulating device of the fuel delivery pump of the present invention.
Fig. 2 is a schematic structural diagram of an automatic flow regulating device of an oil transfer pump in the invention.
Fig. 3 is a graph showing the operation stages of the automatic flow rate adjusting device of the fuel delivery pump according to the present invention.
Reference numbers in the figures: 1. an oil transfer pump; 2. a flow automatic regulating device; 3. an inlet of an oil transfer pump; 4. an oil transfer pump outlet; 5. a valve body; 6. a seal ring 1; 7. a seal ring 2; 8. a ball valve fuel flow aperture; 9. a spool valve fuel flow aperture; 10. a seal ring 3; 11. limiting the filter screen; 12. a spool valve core; 13. a ball valve ball; 14. a spool spring; 15. a slide valve adjusting shim; 16. a ball valve spring; 17. and adjusting the screw.
Detailed Description
Example 1
As shown in fig. 3:
in the process I, when the back pressure of the fuel delivery pump is smaller than the opening threshold of the valve element 12, the valve element 12 moves, but the unloading channel of the valve element 12 is not opened at this time.
In the process II, when the back pressure of the oil delivery pump is greater than the opening threshold value of the valve core 12 and the valve core 12 does not move to the limit point, the redundant flow Q1 flows to the inlet of the oil delivery pump from the unloading channel of the valve core 12.
And in the process III, on the basis of the process II, when the valve core 12 moves to the limiting point, the pressure does not reach the opening threshold of the safety valve ball 13, the unloading channel of the safety valve ball 13 is not opened, the flow regulating function of the regulator is overloaded at the moment, the redundant flow Q1 flows to the inlet of the oil delivery pump from the unloading channel of the valve core 12, and the pressure has an inflection point at the moment.
In the process IV, on the basis of the process III, when the pressure reaches the opening threshold of the safety valve ball 13, the safety valve is opened, the flow unloading passage of the valve ball 13 is opened, and the redundant flows Q1 and Q2 flow to the inlet of the oil pump through the flow unloading passages of the valve core 12 and the valve ball 13, respectively.
Claims (2)
1. An automatic flow regulating device of an oil transfer pump for a common rail system is characterized by comprising a valve body, a slide valve core, a slide valve spring, a slide valve adjusting gasket, a limiting filter screen, a ball valve spring, a regulating screw, a ball valve ball and an O-shaped sealing ring; the adjusting screw is screwed in the valve body through threads, and an O-shaped sealing ring is arranged in the circumferential direction; the ball valve spring is arranged on the end face of the adjusting screw, one end of the ball valve spring is pre-pressed to support a ball valve ball, and the ball valve ball is sealed on the conical surface of the spool of the slide valve; the limiting filter screen is pressed in the valve body, one end of the slide valve spring is arranged on the end face of the valve body, the other end of the slide valve spring is pre-pressed on the end face of the valve core, and the valve core of the slide valve is tightly attached to the end face of the limiting filter screen; the valve body is provided with a ball valve fuel oil circulation hole and a slide valve fuel oil circulation hole.
2. The automatic flow regulating device of the oil transfer pump for the common rail system as claimed in claim 1, wherein the small end surface of the valve body of the regulating device is communicated with the outlet of the oil transfer pump, and the valve body is circumferentially communicated with the oil inlet of the oil transfer pump; the valve body is circumferentially provided with an O-shaped sealing ring which is integrally screwed in the cavity of the oil delivery pump body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123137602.6U CN216866868U (en) | 2021-12-14 | 2021-12-14 | Automatic flow regulating device for oil delivery pump of common rail system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123137602.6U CN216866868U (en) | 2021-12-14 | 2021-12-14 | Automatic flow regulating device for oil delivery pump of common rail system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216866868U true CN216866868U (en) | 2022-07-01 |
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ID=82147496
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123137602.6U Active CN216866868U (en) | 2021-12-14 | 2021-12-14 | Automatic flow regulating device for oil delivery pump of common rail system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216866868U (en) |
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2021
- 2021-12-14 CN CN202123137602.6U patent/CN216866868U/en active Active
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