CN102410119A - Fuel oil back pressure valve for marine diesel engine - Google Patents
Fuel oil back pressure valve for marine diesel engine Download PDFInfo
- Publication number
- CN102410119A CN102410119A CN201110233207XA CN201110233207A CN102410119A CN 102410119 A CN102410119 A CN 102410119A CN 201110233207X A CN201110233207X A CN 201110233207XA CN 201110233207 A CN201110233207 A CN 201110233207A CN 102410119 A CN102410119 A CN 102410119A
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- China
- Prior art keywords
- fuel oil
- back pressure
- pressure valve
- valve casing
- diesel engine
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Abstract
The invention relates to a fuel oil back pressure valve for a marine diesel engine. The fuel oil back pressure valve comprises a back pressure valve shell, a piston, a flange and a guide plate, wherein a circle of drain holes are additionally formed on an inner valve shell, and a hole is additionally formed on a corresponding branch pipe and used for draining the fuel oil leaking into an inner cavity; and the originally designed oil leakage holes on the guide plate are omitted, and the clearance between the piston and the inner valve shell is enlarged. By means of design improvement of the fuel oil back pressure valve, the problem of seizure of the fuel oil back pressure valve can be solved, the fuel oil loss caused by fuel oil drain is lowered greatly, the operation reliability and stability of the back pressure valve are improved, the waste return expense is lowered, and the trial run time is saved.
Description
Technical field
The present invention relates to the marine diesel engine field, particularly relate to a kind of fuel oil back pressure valve of marine diesel engine.
Background technique
The fuel oil back pressure valve is installed between diesel engine fuel oil oil inlet pipe and the return flow oil pipe, and its structure is as shown in Figure 1, and the structure of fuel oil back pressure valve includes valve gap; Outer valve casing; Interior valve casing is positioned at the piston and the guide rod of valve casing, between piston and guide rod, is provided with a spring; One thin nut is arranged, length that can Regulation spring on the guide rod.At guide rod and interior valve casing, between interior valve casing and the outer valve casing seal ring is arranged respectively.In above-mentioned on the valve casing circle hole be used for draining, when the fuel pressure in the oil inlet pipe during, promote piston greater than setting pressure, fuel oil flows out from the draining hole, gets back in the return flow oil pipe through the cavity of inside and outside valve casing.Since gapped before piston and the interior valve casing, have fuel oil in the cavity that interior valve casing and piston, guide rod are formed, and these fuel oils get into the fuel oil bleeder pipe through the intermediate hole of guide rod.When the gap was less than normal between piston and interior valve casing, the fuel oil back pressure valve was easy to kill, and when the gap was bigger than normal between them, the amount of fuel of releasing through guide rod can be bigger.
Nut on the said structure intermediate fuel oil back pressure valve guide rod, its effect are the length of adjustment spring, set the cracking pressure in draining hole.
The subject matter that exists in the existing technology is: in fuel oil back pressure valve working procedure, back pressure valve is easy to kill, and is bigger than normal through the amount of fuel that guide rod is released.
Summary of the invention
The objective of the invention is to overcome the deficiency that exists in the above-mentioned existing technology; A kind of fuel oil back pressure valve that is used for marine low speed diesel engine is provided; The piston of this fuel oil back pressure valve and interior valve casing can not killed; Fuel oil no longer gets into the fuel oil bleeder pipe through guide rod, reduces and reprocesses cost, the run-in period of reduction diesel engine.
In order to achieve the above object, technological scheme of the present invention is following:
A kind of fuel oil back pressure valve of marine diesel engine; Constitute by outer valve casing, arm, interior valve casing, guide rod, nut, valve gap, spring, piston and flange; The circumference that is positioned at the bottom of described valve casing has a circle escape orifice, and its characteristics are that the circumference of the bottom of described interior valve casing has the escape orifice of two circles; The quantity of escape orifice doubles many, and the position to said arm offers an escape orifice on the valve casing in described.
It is 0.030～0.068mm that gap between said piston and the interior valve casing increases.
The aperture of described escape orifice is Φ 10.
The circumference that touches with described internal valve shell joint on the described flange is provided with circumferential groove, supplies installing and fixing of described interior valve casing.
Compared with prior art, beneficial effect of the present invention:
(1), promptly changes the tolerance dimension of piston and interior valve casing owing to the gap that has increased piston and interior valve casing.Former gap is 0～0.041mm, and design gaps is 0.030～0.068mm now.After increasing the gap, the problem that piston is killed has obtained good solution.
(2) through on interior valve casing, having increased an escape orifice with described the relative part of tube opening; Replace the intermediate hole on the existing technology guide rod; Be used to discharge the fuel oil that gets into piston, interior valve casing and guide rod composition cavity; So just do not have fuel oil to release in the fuel oil bleeder pipe, reduced the fuel oil loss.
(3) increased by a circle escape orifice on the interior valve casing, having now in the technology is the hole of circle a 8 * Φ 10, change two row 10 * Φ 10 into after, draining can be more rapidly with stable, it is also sensitive more to regulate the fuel oil input pressure, has reduced the fluctuation of fuel oil input pressure.
(4) increase the groove of fixing interior valve casing on the flange, this groove has effectively guaranteed the stability of interior valve casing, makes piston motion more stable.
Description of drawings
Fig. 1 is the structural representation of the fuel oil back pressure valve of marine diesel engine in the existing technology.
Fig. 2 is the structural representation of the fuel oil back pressure valve of marine diesel engine of the present invention.
Fig. 3 be in the fuel oil back pressure valve of marine diesel engine of the present invention in the schematic representation of valve casing.
Embodiment
Below our the fuel oil back pressure valve that combines accompanying drawing and concrete instance to come the present invention to be used for marine diesel engine do further to set forth in detail, but can not limit protection scope of the present invention with this.
See also Fig. 2 and Fig. 3, Fig. 2 is the structural representation of the fuel oil back pressure valve of marine diesel engine of the present invention, Fig. 3 be in the fuel oil back pressure valve of marine diesel engine of the present invention in the schematic representation of valve casing.Visible by figure; The present invention is used for the fuel oil back pressure valve of marine diesel engine, is connected and composed by the outer valve casing of guide rod 1, nut 2, valve gap 34, interior valve casing 5, spring 6, piston 7, flange 9 and arm 11, and the circumference that is positioned at the bottom of described valve casing 5 has a circle escape orifice 8; Its characteristics are; The circumference of the bottom of valve casing 5 has the escape orifice 8 of two circles in described, and the quantity of escape orifice doubles, and the position to said arm 11 offers an escape orifice 10 on the valve casing 5 in described.It is 0.030～0.068mm that gap between said piston 6 and the interior valve casing 5 increases.The aperture of described escape orifice is Φ 10.The circumference that contacts with described interior valve casing 5 on the described flange 11 is provided with a circumferential groove, supplies installing and fixing of described interior valve casing.
Proof after practicality is installed, the present invention reduces the situation generation that fuel oil back pressure valve piston is killed, and reduces fuel loss, reduces to reprocess and opens and inspect man-hour, has practiced thrift cost, has working stability, the characteristics that reliability is higher.
Claims (4)
1. the fuel oil back pressure valve of a marine diesel engine; Connect and compose by outer valve casing (4), arm (11), interior valve casing (5), the guide rod (1) that is positioned at this valve casing (5), nut (2), valve gap (3) spring (6), piston (7) and flange (9); The circumference that is positioned at the bottom of described valve casing (5) has a circle escape orifice (8); It is characterized in that; The circumference of the bottom of valve casing (5) has the escape orifice (8) of two circles in described, and the quantity of escape orifice doubles, and the position that valve casing in described (5) is gone up said arm (11) offers an escape orifice (10).
2. the fuel oil back pressure valve of marine diesel engine according to claim 1 is characterized in that, it is 0.030～0.068mm that the gap between said piston (6) and the interior valve casing (5) increases.
3. the fuel oil back pressure valve of marine diesel engine according to claim 1 is characterized in that, the aperture of described escape orifice is Φ 10.
4. the fuel oil back pressure valve of marine diesel engine according to claim 1 is characterized in that, described flange (11) is gone up the circumference that contacts with described interior valve casing (5) and is provided with a circumferential groove, supplies installing and fixing of described interior valve casing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110233207XA CN102410119A (en) | 2011-08-16 | 2011-08-16 | Fuel oil back pressure valve for marine diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110233207XA CN102410119A (en) | 2011-08-16 | 2011-08-16 | Fuel oil back pressure valve for marine diesel engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102410119A true CN102410119A (en) | 2012-04-11 |
Family
ID=45912406
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110233207XA Pending CN102410119A (en) | 2011-08-16 | 2011-08-16 | Fuel oil back pressure valve for marine diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102410119A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102797607A (en) * | 2012-08-30 | 2012-11-28 | 上海中船三井造船柴油机有限公司 | Back pressure valve for fuel inlet/return pipeline of marine low-speed diesel engine |
| CN104818500A (en) * | 2015-05-28 | 2015-08-05 | 永兴县鸿福金属有限公司 | Anode mud cleaning system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB286893A (en) * | 1927-03-25 | 1928-03-15 | Electro Mechanical Brake Compa | Improvements relating to relief or safety valves |
| GB2160950A (en) * | 1984-06-26 | 1986-01-02 | Coal Ind | Hydraulic damper valves |
| CN1092141A (en) * | 1993-01-27 | 1994-09-14 | 理查德福斯古鲁宾劳斯包股份有限公司 | Large volum pressure limiting valve |
| DE4420623A1 (en) * | 1994-06-14 | 1995-01-19 | Ulrich Keller | Rapid-action plate valve |
| CN101375091A (en) * | 2006-01-31 | 2009-02-25 | 罗伯特·博世有限公司 | High-pressure pump for feeding fuel to an internal combustion engine |
-
2011
- 2011-08-16 CN CN201110233207XA patent/CN102410119A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB286893A (en) * | 1927-03-25 | 1928-03-15 | Electro Mechanical Brake Compa | Improvements relating to relief or safety valves |
| GB2160950A (en) * | 1984-06-26 | 1986-01-02 | Coal Ind | Hydraulic damper valves |
| CN1092141A (en) * | 1993-01-27 | 1994-09-14 | 理查德福斯古鲁宾劳斯包股份有限公司 | Large volum pressure limiting valve |
| DE4420623A1 (en) * | 1994-06-14 | 1995-01-19 | Ulrich Keller | Rapid-action plate valve |
| CN101375091A (en) * | 2006-01-31 | 2009-02-25 | 罗伯特·博世有限公司 | High-pressure pump for feeding fuel to an internal combustion engine |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102797607A (en) * | 2012-08-30 | 2012-11-28 | 上海中船三井造船柴油机有限公司 | Back pressure valve for fuel inlet/return pipeline of marine low-speed diesel engine |
| CN104818500A (en) * | 2015-05-28 | 2015-08-05 | 永兴县鸿福金属有限公司 | Anode mud cleaning system |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120411 |