CN108331950B - Valve core limiting device of flow limiting valve for common rail system - Google Patents
Valve core limiting device of flow limiting valve for common rail system Download PDFInfo
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- CN108331950B CN108331950B CN201810136132.5A CN201810136132A CN108331950B CN 108331950 B CN108331950 B CN 108331950B CN 201810136132 A CN201810136132 A CN 201810136132A CN 108331950 B CN108331950 B CN 108331950B
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- limiting
- flow
- valve
- flow limiting
- limiting valve
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- 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
- F16K17/20—Excess-flow valves
- F16K17/22—Excess-flow valves actuated by the difference of pressure between two places in the flow line
- F16K17/24—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member
- F16K17/28—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member operating in one direction only
- F16K17/30—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member operating in one direction only spring-loaded
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fuel-Injection Apparatus (AREA)
- Safety Valves (AREA)
Abstract
The invention belongs to the technical field of common rail fuel injection systems, and relates to a valve core limiting device of a flow limiting valve for a common rail system, which comprises a flow limiting valve body, wherein an inner core of the flow limiting valve is arranged in an inner cavity of the flow limiting valve body in a sliding manner, a flow limiting valve spring is sleeved on the surface of the upper core body of the inner core of the flow limiting valve, the upper end of the flow limiting valve spring is tightly pressed on a step surface on the upper part of the inner cavity of the flow limiting valve body, and the lower end of the flow limiting valve spring is tightly pressed on; and a valve core limiting device used for adjusting the closing flow of the flow limiting valve is arranged in a gap at the lower part of the inner cavity of the flow limiting valve body, and the position of the moving end of the valve core limiting device and the inner cavity of the flow limiting valve body is limited through a limiting structure. The limiting device can effectively solve the problems of loosening of threads, press fitting and flanging and welding releasing of the flow limiting valve core limiting device.
Description
Technical Field
The invention belongs to the technical field of common rail fuel injection systems, and relates to a valve core limiting device of a flow limiting valve for a common rail system.
Background
The valve core limiting device of the existing flow limiting valve adopts a threaded tightening and laser welding structure or an interference press-fit laser welding structure. The valve core limiting device of the flow limiting valve adopts a thread tightening and laser welding structure and has thread loosening and welding failure; the flow limiting valve core limiting device adopts an interference press-fit and laser welding structure, and has press-fit flanging and welding failure.
Disclosure of Invention
Aiming at the problems, the invention provides a valve core limiting device of a flow limiting valve for a common rail system, which can effectively solve the problems of loose threads, press fit flanging and welding releasing of the valve core limiting device of the flow limiting valve.
According to the technical scheme of the invention: the utility model provides a flow restriction valve case stop device for common rail system which characterized in that: the flow limiting valve comprises a flow limiting valve body, wherein a flow limiting valve inner core is arranged in an inner cavity of the flow limiting valve body in a sliding mode, a flow limiting valve spring is sleeved on the surface of a core body on the upper portion of the flow limiting valve inner core, the upper end of the flow limiting valve spring is tightly pressed on a step surface on the upper portion of the inner cavity of the flow limiting valve body, and the lower end of the flow limiting valve spring is tightly pressed on a step on the surface of the flow; and a valve core limiting device used for adjusting the closing flow of the flow limiting valve is arranged in a gap at the lower part of the inner cavity of the flow limiting valve body, and the position of the moving end of the valve core limiting device and the inner cavity of the flow limiting valve body is limited through a limiting structure.
As a further improvement of the invention, the valve core limiting device comprises an upper limiting body and a lower limiting body which are connected with each other and can realize relative axial sliding, and the upper surface of the upper limiting body abuts against the bottom surface of the inner core of the flow limiting valve.
As a further improvement of the invention, the cylinder body part of the upper retainer is provided with a sliding groove extending along the vertical direction, the cylinder body surface of the lower retainer is provided with a protrusion, the cylinder body part of the lower retainer is arranged in the cylinder body part of the upper retainer in a matching way, the protrusion is arranged in the sliding groove, the cylinder body part of the upper retainer is sleeved with a limiting device spring, the upper end of the limiting device spring is propped against an end cover plate at the upper part of the upper retainer, and the lower end of the limiting device spring is pressed on an end baffle plate at the lower part of the lower retainer.
As a further improvement of the invention, the limiting structure comprises a limiting step arranged in the inner cavity of the flow limiting valve body and a chamfered part arranged on the upper limit body of the valve core limiting device, and the chamfered part and the limiting step are matched with each other to limit the upward position of the upper limit body.
The invention has the technical effects that: the valve core limiting device is mainly used for limiting the high-pressure oil outlet amount of a common rail system, and the problems of loosening of threads, press fitting and flanging and welding releasing of the valve core limiting device of the flow limiting valve can be effectively solved when the valve core limiting device is used because the valve core limiting device is assembled in the flow limiting valve body in a clearance mode.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural diagram of the valve core limiting device in the invention.
Fig. 3 is a view from a-a of fig. 2.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
Fig. 1 to 3 include a flow limiting valve body 1, a limiting step 1-1, a flow limiting valve spring 2, a flow limiting valve inner core 3, a valve core limiting device 4, a limiting structure 5, an upper limiting body 6, a chamfer part 6-1, a limiting device spring 7, a lower limiting body 8, a sliding groove 9, a protrusion 10, and the like.
As shown in fig. 1 to 3, the invention relates to a valve core limiting device of a flow limiting valve for a common rail system, which comprises a flow limiting valve body 1, wherein an inner cavity of the flow limiting valve body 1 is provided with a flow limiting valve inner core 3 in a sliding manner, the surface of the upper core body of the flow limiting valve inner core 3 is sleeved with a flow limiting valve spring 2, the upper end of the flow limiting valve spring 2 is tightly pressed on the step surface of the upper part of the inner cavity of the flow limiting valve body 1, and the lower end of the flow limiting valve spring 2 is tightly pressed on the step surface of the inner core; and a valve core limiting device 4 for adjusting the closing flow of the flow limiting valve is arranged in a gap at the lower part of the inner cavity of the flow limiting valve body 1, and the position between the moving end of the valve core limiting device 4 and the inner cavity of the flow limiting valve body 1 is limited by a limiting structure 5.
The valve core limiting device 4 comprises an upper limiting body 6 and a lower limiting body 8 which are connected with each other and can realize relative axial sliding, and the upper surface of the upper limiting body 6 is abutted against the bottom surface of the inner core 3 of the flow limiting valve.
Go up the barrel part of retainer 6 and be equipped with the spout 9 that extends along vertical direction, the barrel surface of lower retainer 8 is equipped with protruding 10, and in the barrel part cooperation of lower retainer 8 was arranged in the barrel part of upper retainer 6, protruding 10 was arranged in spout 9, and stop device spring 7 was established to the barrel part cover of upper retainer 6, stop device spring 7 upper end top was tight on the end cover board on upper retainer 6 upper portion, and stop device spring 7 lower extreme compresses tightly on the end shield of lower retainer 8 lower part.
The limiting structure 5 comprises a limiting step 1-1 arranged in the inner cavity of the flow limiting valve body 1 and a chamfer 6-1 arranged on an upper limit body 6 of the valve core limiting device 4, wherein the chamfer 6-1 and the limiting step 1-1 are matched with each other to limit the upward position of the upper limit body 6.
The working process of the invention is as follows: after high-pressure fuel enters the flow limiting valve, because the throttling action of the flow limiting valve inner core 3 generates differential pressure in front of and behind the flow limiting valve inner core, the flow limiting valve inner core 3 overcomes the movement of the flow limiting valve spring 2, when the flow passing through the flow limiting valve is overlarge, the flow limiting valve inner core 3 is attached to the flow limiting valve body 1, the flow limiting valve is closed, a high-pressure fuel flow passage is cut off, and the flow limiting action is achieved. Wherein the flow restriction valve body has a limiting structure 5, and the stroke of the inner core 3 of the flow restriction valve is ensured through limiting, so that the closing flow of the flow restriction valve is determined. The valve core limiting device 4 consists of an upper limiting body 6, a lower limiting body 8 and a limiting device spring 7, wherein the upper limiting body 6 is provided with a sliding groove 9, and the lower limiting body 8 is provided with a cylindrical protrusion 10. The upper retainer 6 and the lower retainer 8 can overcome the movement of the spring 7 of the limiting device within the limiting range of the sliding groove 9 and the protrusion 10, and the total height of the limiting device 4 is ensured to be variable. The assembly of the limiting device 4 in the flow limiting valve body 1 can enable the limiting device spring 7 to have a compression pretightening force which is larger than the impact force of the flow limiting valve core 2 on the limiting device 4 when in work, so that the effect of limiting the axial position of the flow limiting valve core 2 in the flow limiting valve body 1 is achieved.
Claims (3)
1. The utility model provides a flow restriction valve case stop device for common rail system which characterized in that: the flow limiting valve comprises a flow limiting valve body (1), wherein a flow limiting valve inner core (3) is arranged in an inner cavity of the flow limiting valve body (1) in a sliding mode, a flow limiting valve spring (2) is sleeved on the surface of the core body on the upper portion of the flow limiting valve inner core (3), the upper end of the flow limiting valve spring (2) is pressed on a step surface on the upper portion of the inner cavity of the flow limiting valve body (1), and the lower end of the flow limiting valve spring (2) is pressed on a step on the surface of the flow limiting valve inner core (; a valve core limiting device (4) for adjusting the closing flow of the flow limiting valve is arranged in a gap at the lower part of the inner cavity of the flow limiting valve body (1), and the position between the moving end of the valve core limiting device (4) and the inner cavity of the flow limiting valve body (1) is limited by a limiting structure (5); the valve core limiting device (4) comprises an upper limiting body (6) and a lower limiting body (8) which are connected with each other and can realize axial relative sliding, and the upper surface of the upper limiting body (6) abuts against the bottom surface of the inner core (3) of the flow limiting valve.
2. The flow restriction valve spool limiting device for a common rail system of claim 1, wherein: go up the barrel part of retainer (6) and be equipped with spout (9) that extend along vertical direction, the barrel surface of lower retainer (8) is equipped with protruding (10), and the barrel part cooperation of lower retainer (8) is arranged in the barrel part of last retainer (6) in, and spout (9) are arranged in to protruding (10), and stop device spring (7) are established to the barrel part cover of last retainer (6), stop device spring (7) upper end top is tight on the end cover board on last retainer (6) upper portion, and stop device spring (7) lower extreme compresses tightly on the end shield of lower retainer (8) lower part.
3. The flow restriction valve spool limiting device for a common rail system of claim 1, wherein: the limiting structure (5) comprises a limiting step (1-1) arranged in an inner cavity of the flow limiting valve body (1) and a chamfering part (6-1) arranged on the upper limit body (6) of the valve core limiting device (4), and the chamfering part (6-1) and the limiting step (1-1) are matched with each other to limit the upward position of the upper limit body (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810136132.5A CN108331950B (en) | 2018-02-09 | 2018-02-09 | Valve core limiting device of flow limiting valve for common rail system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810136132.5A CN108331950B (en) | 2018-02-09 | 2018-02-09 | Valve core limiting device of flow limiting valve for common rail system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108331950A CN108331950A (en) | 2018-07-27 |
| CN108331950B true CN108331950B (en) | 2020-03-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810136132.5A Active CN108331950B (en) | 2018-02-09 | 2018-02-09 | Valve core limiting device of flow limiting valve for common rail system |
Country Status (1)
| Country | Link |
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| CN (1) | CN108331950B (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB628284A (en) * | 1947-02-18 | 1949-08-25 | Bryans Aeroquipment Ltd | Improvements in valves for stopping or/and controlling the flow of fluids, especially under high pressures |
| JPH0450501A (en) * | 1990-06-15 | 1992-02-19 | Tokimec Inc | Accumulator opening valve |
| DE102012214107A1 (en) * | 2011-08-26 | 2013-02-28 | Schaeffler Technologies AG & Co. KG | Pressure control device for hydraulic conductor of hydraulic system for operating clutch in motor vehicle, has sleeve part concentrically surrounding diaphragm body, where sleeve part and diaphragm body are made of steel material |
| CN202349300U (en) * | 2011-09-28 | 2012-07-25 | 上海靓消消防装备有限公司 | Overflow valve |
| CN203516861U (en) * | 2013-10-11 | 2014-04-02 | 安徽理工大学 | Straight-through type one-way valve |
| CN106015675B (en) * | 2016-07-07 | 2018-04-24 | 天津市海盛泵业制造有限公司 | A kind of one-way pressure-regulating overflow valve with thrust bearing |
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2018
- 2018-02-09 CN CN201810136132.5A patent/CN108331950B/en active Active
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| Publication number | Publication date |
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| CN108331950A (en) | 2018-07-27 |
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