CN107905931B - Common rail oil injector without oil return - Google Patents
Common rail oil injector without oil return Download PDFInfo
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- CN107905931B CN107905931B CN201711037698.4A CN201711037698A CN107905931B CN 107905931 B CN107905931 B CN 107905931B CN 201711037698 A CN201711037698 A CN 201711037698A CN 107905931 B CN107905931 B CN 107905931B
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- oil
- seat
- injector body
- flow control
- spring
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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
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/02—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 of valveless type
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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
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
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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
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention discloses a common rail oil injector without oil return, which comprises an electromagnetic valve component, an oil injector body, an electromagnetic valve tightening cap, a control valve matching component, a tightening seat, a flow control mechanism, a pressure regulating gasket, a pressure regulating spring, a spring seat, a middle block, an oil injection nozzle matching component and a tightening cap, wherein the electromagnetic valve component is arranged at the upper end of the oil injector body, the control valve matching component, the tightening seat and the flow control mechanism are arranged in an upper groove of the oil injector body, the pressure regulating gasket, the pressure regulating spring and the spring seat are arranged in a lower groove of the oil injector body, the upper end surface of the middle block is matched with the lower end surface of the oil injector body, the lower end surface of the middle block is matched with the oil injection nozzle matching component, the lower part of the tightening seat is matched with the upper part of the flow control mechanism, the lower part of the flow control mechanism is matched, and the other side of the oil sprayer body, which is close to the bottom wall, is provided with a second internal opening communicated with the lower oil duct part of the tightening seat.
Description
Technical Field
The invention relates to the technical field of oil injection equipment of diesel engines, in particular to a common rail oil injector without oil return.
Background
Along with the increasingly strict requirements of emission regulations, an engine fuel injection system is gradually transited to an electronic control high-pressure common rail system, the core of a common rail product lies in that full electronic control high-pressure injection is realized through a common rail fuel injector, the common rail fuel injector in the prior art mainly comprises three major parts, namely a control valve matching part, a valve component and a fuel injection nozzle matching part, and an electromagnetic valve component, the four major parts limit the reduction of the length of the fuel injector and also limit the application range of the common rail fuel injector, so that the conventional common rail fuel injector cannot be arranged on a low-power small-size engine, and the structure of the conventional common rail fuel injector is changed to be a.
In addition, the common rail injector in the prior art adopts a combination mode of three major matching parts, namely a control valve matching part, a valve component and an injection nozzle matching part, and an electromagnetic valve component, the minimum length is more than 200mm, and the application range is limited. The invention ensures that the minimum length of the common rail oil injector can be within 140mm, and the application (use) range of the common rail oil injector is enlarged.
The valve assembly in the prior art comprises a control sleeve and a control piston, wherein the clearance between the control sleeve and the control piston is 2.5 mu m, the tolerance of roughness at a matching part is 0.5 mu m, the tolerance of roundness is 0.0005mm, the tolerance of cylindricity is 0.001mm, the requirement of machining precision is high, a plurality of machining processes are needed, the machining cost is high, the oil inlet and outlet hole of the control sleeve needs electric spark machining, the machining time is long, and the cost is high. The invention uses the flow control plate to replace a valve component, does not need the insertion and the assembly of a control sleeve and a control piston, has the processing requirement that the roughness tolerance of the most strict end face is only 0.4 mu m, and effectively reduces the processing cost.
The common rail oil injector body in the prior art needs to be provided with a valve component mounting hole, and the oil circuit arrangement is complex. The invention replaces the valve component with the flow control plate, and the oil injector body does not need to process a valve component mounting hole, thereby reducing the processing procedures and the cutter loss and the processing cost.
The conventional common rail oil injector indirectly controls the opening and closing of a needle valve in an oil nozzle matching part through a hydraulic amplification principle, the static oil return amount and the dynamic oil return amount are large, especially under the condition that the rail pressure requirement is higher and higher, the oil supply capacity of a pump is greatly tested, and the loss of the common rail pump is increased. The invention adopts the electromagnetic valve to directly control the opening and closing of the needle valve without oil return, thereby greatly reducing the requirement on the oil supply capacity of the pump and enabling the common rail system to select a smaller oil pump.
The conventional common rail fuel injector has more matching parts and higher failure rate. The oil nozzle matching part and the valve component belong to vulnerable parts, and particularly the maintenance cost of the valve component is high. The flow control plate replaces the valve component, so that the fault rate of the common rail fuel injector is effectively reduced, and the user cost can be saved.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the common rail oil injector without oil return; the invention replaces the valve component with the flow control board, has simple structure, directly controls the oil needle switch by the electromagnetic valve, and the flow control board is rapidly opened after the electromagnetic valve is electrified to supply high-pressure oil to the oil nozzle matching part to atomize fuel oil, thereby effectively reducing the failure rate of the common rail oil injector, solving the problems of more matching parts and high failure rate of the common rail oil injector in the prior art, in particular the problem of higher maintenance cost of the valve component, reducing the assembly cost and improving the economic benefit.
The technical scheme for solving the technical problem is as follows:
a common rail oil injector without oil return comprises an electromagnetic valve component, an oil injector body, an electromagnetic valve tightening cap, a control valve matching component, a tightening seat, a flow control mechanism, a pressure regulating gasket, a pressure regulating spring, a spring seat, a middle block, an oil injection nozzle matching component and a tightening cap, wherein the electromagnetic valve component is arranged at the upper end of the oil injector body and is fastened with the oil injector body through the electromagnetic valve tightening cap; the upper end face of the middle block is matched with the lower end face of the oil injector body, the lower end face of the middle block is matched with the oil nozzle matching part, the middle block and the oil nozzle matching part are connected with the lower end of the oil injector body through a tightening cap, the lower portion of the tightening seat is matched with the upper portion of the flow control mechanism, the lower portion of the flow control mechanism is matched with the bottom wall of the upper groove of the oil injector body, the tightening seat is connected with the oil injector body, a vertically through inner hole I is formed between one side of the bottom wall of the upper groove of the oil injector body and the lower end face of the oil injector body, a vertically through inner hole II is formed in the other side, close to the bottom wall, of the oil injector body, and the inner hole II is communicated with the lower oil duct portion of the tightening seat.
The flow control mechanism comprises a flow control plate, a pressing block and a sealing ball body, wherein a throttling hole is arranged at the axial center of the flow control plate, the lower opening of the throttling hole is communicated with the upper groove of the oil injector body, a conical groove is arranged in the middle of the upper end surface of the flow control plate, the outer edge of the upper end surface of the flow control plate is in sealing fit with the outer edge of the lower end surface of the tightening seat, the upper opening of the throttling hole is a conical surface lower than the conical groove, the conical surface is matched with the sealing ball body, the lower part of the pressing block is provided with a spherical groove under the pressing block, the upper.
The tight seat comprises an upper connecting part and a lower oil duct part which are connected, the outer diameter of the upper connecting part is larger than that of the lower oil duct part, the outer cylindrical surface of the upper connecting part is in threaded fit connection with an inner hole of an oil injector body, a spring groove is arranged in the middle of the upper part of the tight seat, the lower end of the spring is connected with the bottom of the spring groove, the upper end of the spring is connected with a spring seat, the lower oil duct part comprises a first tight seat oil channel which is close to the lower end surface of the tight seat and perpendicular to the axis of a valve core of a control valve matching part, and a second tight seat oil channel which is parallel to the axis of the valve core of the control valve matching part, the first tight seat oil channel is located at the inner side of the first tight seat oil channel and close to the axis of the control valve matching part, the inner side of the first tight seat oil channel is vertically communicated with the upper part of the second tight seat oil channel, the lower end, the middle oil channel is communicated with an oil channel of the oil nozzle matching part on the oil nozzle matching part.
The invention has the beneficial effects that:
1. the common rail oil atomizer adopts the flow control mechanism to replace the valve component, so that the problems of more matching parts and higher failure rate of the common rail oil atomizer in the prior art are solved, particularly the problem of higher maintenance cost of the valve component is solved, and the assembly cost is reduced; the oil injector body does not need to additionally process a valve component mounting hole and an oil return hole, so that the structure is simple, the processing procedures are reduced, the loss of a cutter and a machine tool is reduced, and the processing cost is low.
2. The oil sprayer has no oil return, and under the condition that the oil quantity of the oil sprayer is the same, the oil sprayer reduces the oil supply quantity of a pump by 50 percent, thereby greatly reducing the use cost.
3. The oil injector body has a simple structure, the oil passages are arranged less, and the oil injection function of the common rail system can be realized after the length of the oil injector body is shorter than that of the prior art; when the fuel injector is damaged, only the fuel injection nozzle matching part or the electromagnetic valve part needs to be replaced, so that the maintenance is convenient, and the use and maintenance cost is low.
4. The minimum length of the common rail injector can be within 140mm, the application (use) range of the common rail injector is enlarged, and the problems that the common rail injector adopts a combination mode of three coupling parts of a control valve coupling part, a valve component and an injection nozzle coupling part and an electromagnetic valve component, the minimum length is more than 200mm, and the use range is limited in the prior art are solved.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a common rail injector according to the present invention, as shown in FIG. 1;
fig. 2 is a partially enlarged view of fig. 1.
Detailed Description
For a better understanding of the present invention, embodiments thereof are explained in detail below with reference to the accompanying drawings.
Referring to fig. 1 and 2, the invention relates to a common rail injector without a valve assembly and oil return, which comprises an electromagnetic valve component 1, an injector body 6, an electromagnetic valve locking cap 2, a control valve matching part 3, a locking seat 4, a flow control plate 5, a pressure regulating gasket 7, a pressure regulating spring 8, a spring seat 9, an intermediate block 10, an injector matching part 12 and a locking cap 11. The electromagnetic valve component 1 is arranged at the upper end of the oil injector body 6 and is fastened with the oil injector body 6 through the electromagnetic valve tightening cap 2; the control valve matching part 3, the tight seat 4 and the flow control mechanism are arranged in an upper groove of the oil injector body 6, the pressure regulating gasket 7, the pressure regulating spring 8 and the spring seat 9 are arranged in a lower groove of the lower end of the oil injector body 6, the upper end surface of the middle block 10 is matched with the lower end surface of the oil injector body 6, the lower end surface of the middle block 10 is matched with the oil nozzle matching part 12, the middle block 10 and the oil nozzle matching part 12 are connected with the lower end of the oil injector body 6 through a tight cap 11, the lower part of the tight seat 4 is matched with the upper part of the flow control mechanism, the lower part of the flow control mechanism is matched with the bottom wall of an upper groove 63 of the oil injector body 6, the tight seat 4 is connected with the oil injector body 6, an internal perforated hole I61 which is vertically communicated is arranged between one side of the bottom wall of the upper groove of the oil injector body 6, the second internal opening 62 communicates with the lower oil passage portion of the tight seat 4.
The flow control mechanism comprises a flow control plate 5, a pressing block 13 and a sealing ball 14, wherein an orifice 51 is arranged at the axial center of the flow control plate 5, the lower opening of the orifice 51 is communicated with an upper groove 63 of an oil injector body 6, a conical groove 52 is arranged in the middle of the upper end face of the flow control plate 5, the outer edge of the upper end face of the flow control plate 5 is in sealing fit with the outer edge of the lower end face of a fastening seat 4, the upper opening of the orifice 51 is a conical surface lower than the conical groove 52, the conical surface is matched with the sealing ball, a pressing block lower spherical groove is arranged at the lower part of the pressing block 13, the upper part of the sealing ball is matched with the,
the tight seat 4 comprises an upper connecting part and a lower oil duct part which are connected, the outer diameter of the upper connecting part is larger than that of the lower oil duct part, the outer cylindrical surface of the upper connecting part is connected with an inner hole of an oil injector body 6 in a threaded fit manner, a spring groove 17 is arranged in the middle of the upper part of the tight seat 4, the lower end of a spring 16 is connected with the bottom of the spring groove, the upper end of the spring is connected with a spring seat 15, the lower oil duct part comprises a tight seat oil channel I41 which is close to the lower end face of the tight seat 4 and is vertical to the valve core axis of the control valve matching part 3, a tight seat oil channel II 42 which is parallel to the valve core axis of the control valve matching part 3, the tight seat oil channel II 42 is positioned at the position, close to the axis of the control valve matching part 3, the inner side of the tight seat oil channel I41 is vertically communicated with the upper part of the tight seat oil channel II 42, the lower end opening, the lower part of the second internal opening 62 is communicated with a middle block oil passage 101 of the middle block 10, and the middle block oil passage 101 is communicated with an oil nozzle matching part oil passage 121 on the oil nozzle matching part 12.
One end of the middle block 10 is in surface contact with the oil injector body 6, the other end is in surface contact with the oil nozzle matching part 12, and the oil injector body 6, the middle block 10 and the oil nozzle matching part 12 are firmly contacted through screwing of the tightening cap 11. The other end of the fuel spray nozzle matching part 12 extends out of the tightening cap 11. The common rail oil injector of the invention uses a flow control plate 5 to replace a valve component, so that the cost of the assembly is reduced; the oil injector body 6 does not need to additionally machine a valve component mounting hole and an oil return hole, so that the structure is simple, machining procedures are reduced, the loss of a cutter and a machine tool is reduced, and the machining cost is low; the oil sprayer has no oil return, and under the condition that the oil quantity of the oil sprayer is the same, the oil sprayer reduces the oil supply quantity of a pump by 50 percent; the oil injector body has a simple structure, the oil passages are arranged less, and the oil injection function of the common rail system can be realized when the length of the oil injector body is as short as 140 mm; when the fuel injector is damaged, only the fuel injection nozzle matching part or the electromagnetic valve part needs to be replaced, and the maintenance is convenient.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (2)
1. A common rail oil injector without oil return is characterized by comprising an electromagnetic valve component, an oil injector body, an electromagnetic valve tightening cap, a control valve matching component, a tightening seat, a flow control mechanism, a pressure regulating gasket, a pressure regulating spring, a spring seat, a middle block, an oil injection nozzle matching component and a tightening cap, wherein the electromagnetic valve component is arranged at the upper end of the oil injector body and is fastened with the oil injector body through the electromagnetic valve tightening cap; the control valve matching part, the tightening seat and the flow control mechanism are arranged in an upper groove of the oil injector body, the pressure regulating gasket, the pressure regulating spring and the spring seat are arranged in a lower groove of the lower end of the oil injector body, the upper end face of the middle block is matched with the lower end face of the oil injector body, the lower end face of the middle block is matched with the oil nozzle matching part, the middle block and the oil nozzle matching part are connected with the lower end of the oil injector body through the tightening cap, the lower part of the tightening seat is matched with the upper part of the flow control mechanism, the lower part of the flow control mechanism is matched with the bottom wall of the upper groove of the oil injector body, the tightening seat is connected with the oil injector body, an internal hole I which is vertically communicated is arranged between one side of the bottom wall of the upper groove and the lower end face of the;
the flow control mechanism comprises a flow control plate, a pressing block and a sealing ball body, wherein a throttling hole is arranged at the axial center of the flow control plate, the lower opening of the throttling hole is communicated with the upper groove of the oil injector body, a conical groove is arranged in the middle of the upper end surface of the flow control plate, the outer edge of the upper end surface of the flow control plate is in sealing fit with the outer edge of the lower end surface of the tightening seat, the upper opening of the throttling hole is a conical surface lower than the conical groove, the conical surface is matched with the sealing ball body, the lower part of the pressing block is provided with a spherical groove under the pressing block, the upper.
2. The common rail fuel injector without return oil of claim 1, wherein the close seat includes an upper connecting portion and a lower oil passage portion connected to each other, an outer diameter of the upper connecting portion is larger than an outer diameter of the lower oil passage portion, an outer cylindrical surface of the upper connecting portion is connected to an inner bore of the injector body by screw-fitting, a spring groove is provided in a middle of an upper portion of the close seat, a lower end of the spring is connected to a bottom of the spring groove, an upper end of the spring is connected to a spring seat, the lower oil passage portion includes a first close seat oil passage perpendicular to an axis of a spool of the control valve coupling member and located close to a lower end surface of the close seat, a second close seat oil passage parallel to an axis of the spool of the control valve coupling member, the first close seat oil passage is located close to the axis of the control valve coupling member at an inner side thereof, an inner side of the first close seat oil passage is vertically communicated with an upper portion of the second close seat oil passage, a, the lower part of the internal opening II is communicated with an oil channel of the middle block, and the oil channel of the middle block is communicated with an oil channel of the oil nozzle matching part on the oil nozzle matching part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711037698.4A CN107905931B (en) | 2017-10-30 | 2017-10-30 | Common rail oil injector without oil return |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711037698.4A CN107905931B (en) | 2017-10-30 | 2017-10-30 | Common rail oil injector without oil return |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107905931A CN107905931A (en) | 2018-04-13 |
| CN107905931B true CN107905931B (en) | 2020-04-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711037698.4A Active CN107905931B (en) | 2017-10-30 | 2017-10-30 | Common rail oil injector without oil return |
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| CN (1) | CN107905931B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109139319B (en) * | 2018-09-27 | 2023-09-29 | 重油高科电控燃油喷射系统(重庆)有限公司 | Common rail fuel injector |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1969120A (en) * | 2004-06-03 | 2007-05-23 | 博世株式会社 | Fuel injection valve |
| CN101251068A (en) * | 2008-03-21 | 2008-08-27 | 北京理工大学 | Valve core type high pressure co-rail electric-controlled oil ejector |
| CN103644061A (en) * | 2013-12-05 | 2014-03-19 | 中国第一汽车股份有限公司无锡油泵油嘴研究所 | Self-relieving non-return-oil oil atomizer and refitting method of same |
| CN104775954A (en) * | 2015-03-27 | 2015-07-15 | 中国北方发动机研究所(天津) | Oil-return-free common-rail injector controlled by electromagnetic valve |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005054361A1 (en) * | 2005-11-15 | 2007-05-24 | Fev Motorentechnik Gmbh | high-pressure fuel |
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2017
- 2017-10-30 CN CN201711037698.4A patent/CN107905931B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1969120A (en) * | 2004-06-03 | 2007-05-23 | 博世株式会社 | Fuel injection valve |
| CN101251068A (en) * | 2008-03-21 | 2008-08-27 | 北京理工大学 | Valve core type high pressure co-rail electric-controlled oil ejector |
| CN103644061A (en) * | 2013-12-05 | 2014-03-19 | 中国第一汽车股份有限公司无锡油泵油嘴研究所 | Self-relieving non-return-oil oil atomizer and refitting method of same |
| CN104775954A (en) * | 2015-03-27 | 2015-07-15 | 中国北方发动机研究所(天津) | Oil-return-free common-rail injector controlled by electromagnetic valve |
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| CN107905931A (en) | 2018-04-13 |
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Effective date of registration: 20210914 Address after: 265718 No. 51, Xingyu Road, Longkou high tech Industrial Park, Yantai City, Shandong Province Patentee after: LONGKOU LONGBENG DIESEL OIL INJECTION HIGH-TECH Co.,Ltd. Address before: 264006 No. 1 Yanhe Road, Longkou City East Street, Yantai, Shandong Patentee before: LONGKOU LONGBENG FUEL INJECTION Co.,Ltd. |
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