CN110594460A - Hard-seal fuel oil back pressure valve of diesel engine - Google Patents
Hard-seal fuel oil back pressure valve of diesel engine Download PDFInfo
- Publication number
- CN110594460A CN110594460A CN201910845570.3A CN201910845570A CN110594460A CN 110594460 A CN110594460 A CN 110594460A CN 201910845570 A CN201910845570 A CN 201910845570A CN 110594460 A CN110594460 A CN 110594460A
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- Prior art keywords
- valve
- hard
- valve body
- back pressure
- plug
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- 239000000295 fuel oil Substances 0.000 title claims abstract description 20
- 238000007789 sealing Methods 0.000 claims abstract description 40
- 239000003921 oil Substances 0.000 claims abstract description 16
- 239000000446 fuel Substances 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
- F16K17/06—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with special arrangements for adjusting the opening pressure
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lift Valve (AREA)
Abstract
The invention discloses a hard seal fuel oil back pressure valve of a diesel engine, which comprises: the oil inlet valve comprises a valve body, a valve seat, a valve core, a first screw plug and a second screw plug, wherein the first screw plug is arranged on the oil inlet, the top of the first screw plug extends into the valve body and is provided with a first hard sealing surface, the top of the valve body is provided with a mounting hole pointing to the first screw plug, the second screw plug is arranged on the mounting hole and the bottom of the second screw plug extends into the valve body, the valve core is arranged in the valve body and the top of the valve core is provided with a guide rod extending into the second screw plug, a spring positioned between the second screw plug and the valve core is concentrically arranged on the guide rod, the valve seat is arranged at the bottom of the valve core, and the bottom of the valve seat is provided with a second hard sealing surface corresponding to the first hard. Through the mode, the diesel engine hard seal fuel oil back pressure valve disclosed by the invention is hard sealed through the combination of the first hard seal surface and the second hard seal surface, is stable in structure, is not easy to damage, and is low in operation and maintenance cost.
Description
Technical Field
The invention relates to the technical field of back pressure valves, in particular to a hard seal fuel oil back pressure valve of a diesel engine.
Background
The back pressure valve is used for supporting the hydraulic system and supporting components moving in various angle directions. After the machine is stopped, the component will fall down automatically due to its own weight, and a back pressure valve is used to build up a certain pressure to support it, so that it will not fall down automatically, and the temperature range of the working medium is usually between-10 deg.C and +55 deg.C.
Due to the problems of structural design and working properties, the existing fuel oil back pressure valve of the 2.5bar diesel engine is an easily-consumed product, a rubber sealing element is easy to age, poor sealing is caused, the maintenance is inconvenient, the six-property requirement of military standard on the product is difficult to achieve, and the improvement is needed.
Disclosure of Invention
The invention mainly solves the technical problem of providing the diesel engine hard seal fuel oil back pressure valve, which improves the sealing effect and the maintenance convenience and reduces the maintenance cost.
In order to solve the technical problems, the invention adopts a technical scheme that: provided is a diesel engine hard seal fuel oil back pressure valve, comprising: the valve comprises a valve body, a valve seat, a valve core, a first screw plug and a second screw plug, wherein an oil inlet is formed in the bottom of the valve body, the first screw plug is arranged on the oil inlet, the top of the first screw plug extends into the valve body and is provided with a first hard sealing surface, the top of the valve body is provided with a mounting hole pointing to the first screw plug, the second screw plug is arranged on the mounting hole and extends into the valve body from the bottom, the valve core is arranged in the valve body and is provided with a guide rod extending into the second screw plug from the top, a spring positioned between the second screw plug and the valve core is concentrically arranged on the guide rod, the valve seat is arranged at the bottom of the valve core, a second hard sealing surface corresponding to the first hard sealing surface is arranged at the bottom of the valve seat, and the first hard sealing surface and the second hard sealing surface are attached to realize hard sealing under the action.
In a preferred embodiment of the invention, an oil outlet is arranged at one side of the valve body.
In a preferred embodiment of the invention, the first plug screw is provided with a through-hole therein such that the first hard sealing surface forms a first annular surface and the second hard sealing surface is provided with a recess concentrically therein forming a second annular surface concentric with the first annular surface.
In a preferred embodiment of the invention, the outer diameter of the second annular surface is larger than the outer diameter of the first annular surface, and the inner diameter of the second annular surface is smaller than the inner diameter of the first annular surface.
In a preferred embodiment of the invention, the top of the valve seat is concavely provided with a jack corresponding to the valve core, and the valve seat and the valve core are movably connected through the jack.
In a preferred embodiment of the present invention, the mounting hole is concentric with the oil inlet.
In a preferred embodiment of the present invention, a section of external thread is disposed outside the second plug, an internal thread corresponding to the external thread is disposed in the mounting hole, or a fixing nut corresponding to the external thread is disposed on the top of the valve body, and a locking nut is disposed on the second plug.
In a preferred embodiment of the invention, the fixing nut is welded on the top of the valve body.
In a preferred embodiment of the present invention, spring seats corresponding to the springs are respectively disposed at the top of the valve core and the bottom of the second plug.
In a preferred embodiment of the invention, the top of the valve body is provided with a bonnet, the top of the second plug screw is positioned in the bonnet, and the bonnet is connected with the valve body in a threaded mode and sealed at the connection position through a gasket.
The invention has the beneficial effects that: the diesel engine hard seal fuel oil back pressure valve provided by the invention is hard sealed by combining the first hard seal surface and the second hard seal surface under the action of the spring, the sealing performance is good, the structure is stable, the valve is not easy to damage, the first plug screw or the valve seat can be detached and independently replaced by unscrewing the first plug screw, the operation and maintenance cost is low, the compression amount of the spring can be changed by rotating the second plug screw, the regulation of rated pressure is realized, the operation is simple and convenient, and the six-property requirement of military standard on products can be met.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
FIG. 1 is a schematic structural diagram of a preferred embodiment of a hard seal fuel oil back pressure valve of a diesel engine according to the present invention;
fig. 2 is a sectional view taken along line a-a of fig. 1.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 ~ and fig. 2, an embodiment of the invention includes:
a diesel engine hard seal fuel back pressure valve comprising: the valve comprises a valve body 1, a valve seat 2, a valve core 3, a first screw plug 9 and a second screw plug 8, wherein an oil inlet is formed in the bottom of the valve body 1, the first screw plug 9 is arranged on the oil inlet, the first screw plug 9 is connected with the oil inlet in a threaded mode, and the valve is convenient to disassemble and assemble.
The top of the first screw plug 9 extends into the valve body 1 and is provided with a first hard sealing surface 11, the top of the valve body 1 is provided with a mounting hole pointing to the first screw plug 9, the second screw plug 8 is arranged on the mounting hole, the bottom of the second screw plug extends into the valve body 1, and the mounting hole is concentric with the oil inlet, so that the first screw plug 9 is concentric with the second screw plug 8.
The valve core 3 is arranged in the valve body 1, the top of the valve core is provided with a guide rod extending into the second plug screw 8, the guide rod is concentrically provided with a spring 6 positioned between the second plug screw 8 and the valve core 3, the top of the valve core 1 and the bottom of the second plug screw 8 are respectively provided with a spring seat 7 corresponding to the spring 6, the diameters of the outer circles of the second plug screw 8 and the valve core 3 are small, the inner hole of the spring 6 is large, the spring seat 7 needs to be in contact with the two ends of the spring 6 through the spring seat 7, and the spring seat 7 is respectively sleeved at the bottom end of the second plug screw 8 and the top end of the valve core.
The valve seat 2 is arranged at the bottom of the valve core 3, the top of the valve seat 2 is concavely provided with a jack corresponding to the valve core 3, the valve seat 2 and the valve core 3 are movably connected through the jack, the valve core 3 is convenient to detach and replace, and the maintenance working time and cost are reduced.
The first plug screw 9 and the valve seat 2 are respectively of a metal structure, a second hard sealing surface 12 corresponding to the first hard sealing surface 11 is arranged at the bottom of the valve seat 2, the first hard sealing surface 11 and the second hard sealing surface 12 are both flat surfaces, and under the action of the spring 6, the first hard sealing surface 11 and the second hard sealing surface 12 are attached to realize hard sealing.
The hard sealing of the first and second hard sealing surfaces 11, 12 requires high machining accuracy and requires surface grinding. The first screw plug 9 is provided with a through hole, so that the first hard sealing surface 11 forms a first annular surface, the second hard sealing surface 12 is concentrically provided with a groove, so that a second annular surface concentric with the first annular surface is formed, on the basis of ensuring the sealing effect, the contact area of the first hard sealing surface 11 and the second hard sealing surface 12 is reduced, the grinding workload is reduced, the first hard sealing surface 11 and the second hard sealing surface 12 are more easily and tightly attached, and the production is more convenient.
The excircle diameter of second toroidal surface is greater than the excircle diameter of first toroidal surface, the hole diameter of second toroidal surface is less than the hole diameter of first toroidal surface, realizes that the second toroidal surface is to the full coverage of first toroidal surface, ensures sealed effect.
The outside of second plug screw 8 is provided with one section external screw thread, be provided with the internal thread that corresponds with the external screw thread in the mounting hole or 1 top of valve body is provided with the fixation nut that corresponds with the external screw thread, conveniently carries out the installation and the regulation of second plug screw 8, changes the decrement of spring 6 to adjustment rated pressure, be provided with lock nut 5 on the second plug screw, carry out the locking of second plug screw 8, avoid the rotation problem, promote job stabilization nature. When the fixing nut is adopted, the fixing nut is welded at the top of the valve body 1, the structure is stable, and the production is convenient.
Since the spring force depends on the action force of the medium on the valve seat 2 and the opening pressure of the first plug screw 9 during the opening and closing process, the spring 6 is the key for controlling the opening pressure and the closing pressure difference. The spring force is too small, which is beneficial to opening, but the pre-compression force of the spring can not generate enough sealing specific pressure at the closing moment of the valve, so as to ensure the requirement that the leakage amount is zero; the spring force is too large, which is beneficial to closing, so that the valve seat 2 has better sealing effect when being closed under the action of the spring force, but can not be opened under the lowest working pressure, or the valve can not be fully opened to reach the standard flow value though being opened.
1 top of valve body is provided with a valve cap 4, 8 tops of second plug screw are located valve cap 4, valve cap 4 adopts the screw thread mode to be connected with valve body 1 to carry out the sealed of junction through packing ring 10, the dismouting is convenient, can ensure the regulation convenience of second plug screw 8, can avoid the problem of 8 departments of second plug screw leakages again.
An oil outlet 13 is formed in one side of the valve body 1, fluid enters from a through hole of the first screw plug 9 and is blocked by the valve seat 2, so that the fluid generates upward pressure on the valve seat 2, when the pressure is high enough, the spring 6 is compressed, and the fluid jacks up the valve seat 2 to form a channel and flows out of the oil outlet 13 of the backpressure valve; if the fluid pressure is not enough, a pressure building is formed, so that the inlet pressure is increased, and the valve seat 2 cannot be jacked up to form a passage until the rated pressure is reached.
The external dimension of the back pressure valve is 197 multiplied by 59 multiplied by 45 mm, the weight is 1175g, the tests of opening pressure, air tightness, strength, high and low temperature and the like which are carried out according to the technical conditions of the back pressure valve meet or are higher than the above standards, for example, the opening pressure is 2-2.5bar, the tightness test is observed for 5min, and no obvious liquid drop or surface moisture exists on the surface; when the strength (pressure resistance) is tested at 5MPa, the observation is carried out for 5min, no obvious visible liquid drop or surface moisture exists on the surface, no structural damage or permanent residual deformation in any form exists, and the sealing test requirement of JB/T9092-1999 is met.
In conclusion, the hard seal fuel oil back pressure valve for the diesel engine, disclosed by the invention, is convenient to adjust and maintain, can prevent the phenomenon of liquid flowing automatically under the action of gravity, meets the application requirements of some special fields, and is wide in application range.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A diesel engine hard seal fuel oil back pressure valve is characterized by comprising: the valve comprises a valve body, a valve seat, a valve core, a first screw plug and a second screw plug, wherein an oil inlet is formed in the bottom of the valve body, the first screw plug is arranged on the oil inlet, the top of the first screw plug extends into the valve body and is provided with a first hard sealing surface, the top of the valve body is provided with a mounting hole pointing to the first screw plug, the second screw plug is arranged on the mounting hole and extends into the valve body from the bottom, the valve core is arranged in the valve body and is provided with a guide rod extending into the second screw plug from the top, a spring positioned between the second screw plug and the valve core is concentrically arranged on the guide rod, the valve seat is arranged at the bottom of the valve core, a second hard sealing surface corresponding to the first hard sealing surface is arranged at the bottom of the valve seat, and the first hard sealing surface and the second hard sealing surface are attached to realize hard sealing under the action.
2. The diesel engine hard seal fuel oil back pressure valve as recited in claim 1, characterized in that an oil outlet is arranged at one side of the valve body.
3. A hard-seal fuel back-pressure valve for a diesel engine as defined in claim 1 wherein the first plug has a through hole formed therein such that the first hard seal surface forms a first annular surface and the second hard seal surface has a recess concentrically formed therein to form a second annular surface concentric with the first annular surface.
4. The diesel hard seal fuel oil back pressure valve as set forth in claim 3, wherein the outer diameter of the second annular surface is larger than the outer diameter of the first annular surface, and the inner diameter of the second annular surface is smaller than the inner diameter of the first annular surface.
5. The diesel engine hard seal fuel oil back pressure valve according to claim 1, characterized in that the top of the valve seat is concavely provided with a jack corresponding to the valve core, and the valve seat and the valve core are movably connected through the jack.
6. The diesel hard seal fuel oil back pressure valve of claim 1, wherein the mounting hole is concentric with the oil inlet.
7. The diesel engine hard seal fuel oil back pressure valve as recited in claim 1, characterized in that a section of external thread is arranged outside the second plug screw, an internal thread corresponding to the external thread is arranged in the mounting hole or a fixing nut corresponding to the external thread is arranged on the top of the valve body, and a locking nut is arranged on the second plug screw.
8. The diesel engine hard seal fuel oil back pressure valve of claim 7, characterized in that the fixing nut is welded on the top of the valve body.
9. The diesel engine hard seal fuel oil back pressure valve as recited in claim 1, characterized in that the top of the valve core and the bottom of the second plug screw are respectively provided with a spring seat corresponding to a spring.
10. The diesel hard seal fuel oil back pressure valve as in claim 1, characterized in that the top of the valve body is provided with a valve cap, the top of the second plug screw is positioned in the valve cap, the valve cap is connected with the valve body in a threaded mode, and the connection is sealed through a gasket.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910845570.3A CN110594460A (en) | 2019-09-09 | 2019-09-09 | Hard-seal fuel oil back pressure valve of diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910845570.3A CN110594460A (en) | 2019-09-09 | 2019-09-09 | Hard-seal fuel oil back pressure valve of diesel engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110594460A true CN110594460A (en) | 2019-12-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910845570.3A Pending CN110594460A (en) | 2019-09-09 | 2019-09-09 | Hard-seal fuel oil back pressure valve of diesel engine |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201496633U (en) * | 2009-09-09 | 2010-06-02 | 楼宝良 | One-way overflow valve |
| CN202402734U (en) * | 2011-12-05 | 2012-08-29 | 北京航天动力研究所 | Corrosion resistant lining type safety valve |
| CN203146937U (en) * | 2013-03-19 | 2013-08-21 | 永一阀门集团有限公司 | Vacuum anti-backflow safety valve |
| CN206530747U (en) * | 2017-03-16 | 2017-09-29 | 重庆欧金机电制造有限公司 | A kind of New type pressure regulating valve of soft and hard seal combination |
| CN206708477U (en) * | 2017-03-22 | 2017-12-05 | 北京航天普霖科技有限公司 | A kind of hard sealing pressure maintaining valve |
| CN206889780U (en) * | 2017-06-26 | 2018-01-16 | 浙江天和阀门有限公司 | A kind of safety valve |
| CN211082978U (en) * | 2019-09-09 | 2020-07-24 | 昆山海芯机电科技有限公司 | Hard-seal fuel oil back pressure valve of diesel engine |
-
2019
- 2019-09-09 CN CN201910845570.3A patent/CN110594460A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201496633U (en) * | 2009-09-09 | 2010-06-02 | 楼宝良 | One-way overflow valve |
| CN202402734U (en) * | 2011-12-05 | 2012-08-29 | 北京航天动力研究所 | Corrosion resistant lining type safety valve |
| CN203146937U (en) * | 2013-03-19 | 2013-08-21 | 永一阀门集团有限公司 | Vacuum anti-backflow safety valve |
| CN206530747U (en) * | 2017-03-16 | 2017-09-29 | 重庆欧金机电制造有限公司 | A kind of New type pressure regulating valve of soft and hard seal combination |
| CN206708477U (en) * | 2017-03-22 | 2017-12-05 | 北京航天普霖科技有限公司 | A kind of hard sealing pressure maintaining valve |
| CN206889780U (en) * | 2017-06-26 | 2018-01-16 | 浙江天和阀门有限公司 | A kind of safety valve |
| CN211082978U (en) * | 2019-09-09 | 2020-07-24 | 昆山海芯机电科技有限公司 | Hard-seal fuel oil back pressure valve of diesel engine |
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