CN201513270U - Flow limiting valve assembly of common rail system - Google Patents
Flow limiting valve assembly of common rail system Download PDFInfo
- Publication number
- CN201513270U CN201513270U CN2009202065202U CN200920206520U CN201513270U CN 201513270 U CN201513270 U CN 201513270U CN 2009202065202 U CN2009202065202 U CN 2009202065202U CN 200920206520 U CN200920206520 U CN 200920206520U CN 201513270 U CN201513270 U CN 201513270U
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- CN
- China
- Prior art keywords
- limiting valve
- flow
- common rail
- endoporus
- valve assembly
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model discloses a flow limiting valve assembly of a common rail system. The flow limiting valve assembly of the common rail system comprises a common rail pipe and a flow limiting valve assembly, wherein internal threads are formed on the inner wall of one end of a flow limiting valve body of the flow limiting valve assembly connected with the common rail pipe; external threads are formed on one end of the common rail pipe connected with the flow limiting valve body; the internal threads fit the outer threads; and a sealing base is arranged at the joint of the flow limiting valve body and the common rail pipe. The flow limiting valve assembly can lower the pressure fluctuation in the common rail pipe so as to supply fuel to a fuel injector at the stable pressure, and can cut off the fuel passage when excessive fuel is supplied, thereby preventing abnormal fuel supply. The flow limiting valve assembly has the advantages of simple detachment and easy maintenance.
Description
Technical field
The utility model relates to a kind of engine oil technology, relates to a kind of common rail system flow-limiting valve assembly in particular.
Technical background
Along with the pay attention to day by day of country to environmental protection, Yan Ge Abgasgesetz will be implemented more.The diesel engine that reaches state IV, V discharging becomes the research direction of domestic each engine works, and fuel oil supply system is to influence one of topmost component of engine emission, will be to present most advanced world common rail system developing direction.
The rail technology forms the constant high pressure fuel oil directly or indirectly by being total to rail altogether, be distributed to each oil sprayer, and by means of the unlatching of flow-limiting valve with closed, control the oil mass that oil sprayer is ejected into the firing chamber quantitatively, thereby guarantee that diesel engine reaches best atomizing, burning and minimum disposal of pollutants.As altogether a kind of pressure pulsation that reduces in the common rail pipe of rail, and provide the oil common rail system flow-limiting valve to have great importance to oil sprayer with pressure stable.
The model utility content
The invention provides a kind of common rail system flow-limiting valve assembly, comprise common rail pipe and flow-limiting valve assembly, its improvements are: the current limliting valve body of the flow-limiting valve assembly inwall of rail pipe connecting end together is provided with internal thread, the connecting end of common rail pipe and current limliting valve body is provided with outside thread, internal thread and outside thread match each other, and the current limliting valve body jointing of rail pipe together is provided with sealing seat.Its concrete structure is:
The flow-limiting valve assembly comprises: sealing seat, flow-limiting valve, current limliting valve body, flow-limiting valve spring;
The current limliting valve body inner bore is divided into three sections by diameter, and the diameter of three sections endoporus increases from top to bottom successively, forms the first diameter endoporus, the second diameter endoporus, the 3rd diameter endoporus;
Flow-limiting valve is arranged in the second diameter endoporus, and the flow-limiting valve spring is arranged between second diameter endoporus bottom and the flow-limiting valve, and the flow-limiting valve spring is in its pre-compressed state,
There is a sealing cone the first diameter endoporus and the second diameter endoporus jointing place, sealing cone and flow-limiting valve upper end coupling; There is an axial notch flow-limiting valve lower end, and radial direction through hole is arranged at flow-limiting valve top, and radial direction through hole is communicated with the axial notch and the second diameter endoporus of flow-limiting valve lower end;
Sealing seat is arranged in the 3rd diameter endoporus, fits with the 3rd diameter endoporus bottom in the sealing seat upper end, and the sealing seat lower end is the conical surface;
The bore openings end of common rail pipe and current limliting valve body joint is a horn-type opening, the horn-type opening coupling on the conical surface of sealing seat lower end and the current limliting valve body;
The sealing seat axial centre is provided with through hole, and the axial hole of sealing seat is communicated with the common rail pipe endoporus and the second diameter endoporus.
Useful technique effect of the present invention is: the common rail system flow-limiting valve can reduce the pressure pulsation in the common rail pipe on the one hand, and provide fuel oil to oil sprayer with pressure stable, simultaneously also can when the fuel oil oversupply occurring, cut off the fuel gallery, thereby prevent that fuel oil from supplying with unusually, it is simple to have dismounting simultaneously, the characteristics that are easy to safeguard.
Description of drawings
The channel status of Fig. 1, common rail system flow-limiting valve;
The closed state of Fig. 2, common rail system flow-limiting valve;
Embodiment
The working principle of common rail system flow-limiting valve is: when the common rail pipe proper functioning, the fuel oil that fuel oil flows out from common rail pipe 1 is supplied with oil sprayer by the hole (arrow represents that fuel oil flows in the diagram) of sealing seat 2, flow-limiting valve 3, current limliting valve body 4; When pressure surge occurring in the high-voltage tube, the resistance that it produces by common rail system current limliting valve opening has destroyed the pressure balance between common rail pipe and the oil sprayer, so the common rail system flow-limiting valve will move to current limliting valve body top, thus the absorption pressure fluctuation; Under the normal pressure fluctuation situation, injection stops because of fuel flow reduces; Along with the amount of fuel by the current limliting valve opening increases, the pressure between common rail pipe and the oil sprayer obtains balance.Because flow-limiting valve spring 5 pressure, flow-limiting valve is pushed to sealing seat one side; But if owing to the abnormal flow state takes place oil sprayer side fuel leakage etc., the fuel oil by the current limliting valve opening will disequilibrium; This will make flow-limiting valve be pushed to prop up the flow-limiting valve body cone and cause the fuel gallery sealing.
The improvements of the utility model maximum are: common rail pipe 1 and flow-limiting valve assembly joint are fixed by original welding, changing screw thread of the present utility model into screws, this makes the processing, easier for installation of internal structure of current limliting valve body 4, when also making the maintenance of current limliting valve body 4 internal faults, dismounting is more prone to, convenience.
Claims (2)
1. common rail system flow-limiting valve assembly, comprise common rail pipe (1) and flow-limiting valve assembly, it is characterized in that: the current limliting valve body (4) of flow-limiting valve assembly is provided with internal thread with the inwall of common rail pipe (1) connecting end, common rail pipe (1) is provided with outside thread with the connecting end of current limliting valve body (4), internal thread and outside thread match each other, and current limliting valve body (4) is provided with sealing seat (2) with the jointing of common rail pipe (1).
2. a kind of common rail system flow-limiting valve assembly according to claim 1, it is characterized in that: the flow-limiting valve assembly comprises: sealing seat (2), flow-limiting valve (3), current limliting valve body (4), flow-limiting valve spring (5);
Current limliting valve body (4) endoporus is divided into three sections by diameter, and the diameter of three sections endoporus increases from top to bottom successively, forms the first diameter endoporus, the second diameter endoporus, the 3rd diameter endoporus;
Flow-limiting valve (3) is arranged in the second diameter endoporus, and flow-limiting valve spring (5) is arranged between second diameter endoporus bottom and the flow-limiting valve (3), and flow-limiting valve spring (5) is in its pre-compressed state,
There is a sealing cone the first diameter endoporus and the second diameter endoporus jointing place, sealing cone and flow-limiting valve (3) upper end coupling; There is an axial notch flow-limiting valve (3) lower end, and radial direction through hole is arranged at flow-limiting valve (3) top, and radial direction through hole is communicated with the axial notch and the second diameter endoporus of flow-limiting valve (3) lower end;
Sealing seat (2) is arranged in the 3rd diameter endoporus, fits with the 3rd diameter endoporus bottom in sealing seat (2) upper end, and sealing seat (2) lower end is the conical surface;
Common rail pipe (1) is a horn-type opening with the bore openings end of current limliting valve body (4) joint, the conical surface of sealing seat (2) lower end and the coupling of the horn-type opening on the current limliting valve body (4);
Sealing seat (2) axial centre is provided with through hole, and the axial hole of sealing seat (2) is communicated with common rail pipe (1) endoporus and the second diameter endoporus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202065202U CN201513270U (en) | 2009-09-29 | 2009-09-29 | Flow limiting valve assembly of common rail system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202065202U CN201513270U (en) | 2009-09-29 | 2009-09-29 | Flow limiting valve assembly of common rail system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201513270U true CN201513270U (en) | 2010-06-23 |
Family
ID=42484678
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202065202U Expired - Fee Related CN201513270U (en) | 2009-09-29 | 2009-09-29 | Flow limiting valve assembly of common rail system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201513270U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104405552A (en) * | 2014-10-20 | 2015-03-11 | 常州博瑞油泵油嘴有限公司 | Liquid flow go-no go gauge |
-
2009
- 2009-09-29 CN CN2009202065202U patent/CN201513270U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104405552A (en) * | 2014-10-20 | 2015-03-11 | 常州博瑞油泵油嘴有限公司 | Liquid flow go-no go gauge |
| CN104405552B (en) * | 2014-10-20 | 2019-10-08 | 常州博瑞油泵油嘴有限公司 | A kind of liquid flow go-no go gauge |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100623 Termination date: 20170929 |