CN111075625A - Overflow valve with two-stage opening pressure to control flow - Google Patents
Overflow valve with two-stage opening pressure to control flow Download PDFInfo
- Publication number
- CN111075625A CN111075625A CN201911414901.4A CN201911414901A CN111075625A CN 111075625 A CN111075625 A CN 111075625A CN 201911414901 A CN201911414901 A CN 201911414901A CN 111075625 A CN111075625 A CN 111075625A
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- Prior art keywords
- stage
- oil
- valve core
- overflow valve
- oil outlet
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Classifications
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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
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
- F02M59/46—Valves
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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
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0001—Fuel-injection apparatus with specially arranged lubricating system, e.g. by fuel oil
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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
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0003—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure
- F02M63/0005—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure using valves actuated by fluid pressure
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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)
- Fluid Mechanics (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention discloses an overflow valve device for controlling flow by two-stage opening pressure of a high-pressure common rail fuel injection system, which comprises a valve core, an overflow valve body, a check ring, an overflow valve sealing ring, a pressure regulating spring and a steel ball, wherein the valve core is provided with a valve body; the oil pressure in the high-pressure common rail is effectively balanced by adopting a primary oil return mode and a secondary oil return mode of the valve core. The valve core and the overflow valve body are matched by adopting a small gap, so that return oil leakage is prevented, and the unstable pressure of the fuel in the common rail is avoided. The valve core is provided with a lubricating oil groove, so that the movement lubricity of the valve core and the valve body of the overflow valve is increased, and the reliability of the overflow valve can be greatly improved. The mode that the check ring prevents fixing the valve core ensures that the valve core does not slip when the overflow valve body moves. Therefore, the pressure and the flow in the high-pressure oil rail are balanced, and the stability, the consistency, the silence and the reliability of the diesel engine provided with the high-pressure common rail fuel injection system are better exerted in the running process.
Description
Technical Field
The invention discloses an overflow valve device for controlling flow through secondary opening pressure for a high-pressure common rail fuel injection system.
Background
The overflow valve device for controlling the flow rate of a fuel injection system through secondary opening pressure at present mainly comprises an overflow valve matching part, a pressure regulating spring, a check ring, an overflow valve sealing ring, a steel ball and other parts. The pressure regulating spring and the steel ball are used for regulating the opening pressure of the safety overflow valve. The overflow valve assembly comprises an overflow valve body and a valve core, wherein the outer circle of the valve core and the inner hole of the overflow valve body are in small clearance matching, friction damage is easily generated in the up-and-down movement process, and pressure and flow in a high-pressure oil rail are unstable, so that the diesel engine provided with the high-pressure common rail fuel injection system is poor in stability, consistency, silence and reliability in the operation process.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide an overflow valve device with two-stage opening pressure to control flow rate, so as to control pressure and flow rate in a high-pressure oil rail.
The technical problem to be solved by the invention can be realized by the following technical scheme:
an overflow valve device with flow controlled by two-stage opening pressure comprises an overflow valve body, a valve core, a pressure regulating spring and a steel ball, wherein an overflow valve body oil return cavity, a valve core hole and a first oil inlet inner hole which are coaxial are arranged in the overflow valve body; an oil injection hole and a second oil inlet inner hole are coaxially arranged in the valve core, and the oil injection hole is communicated with the second oil inlet inner hole; a steel ball and a pressure regulating spring are assembled in an oil return cavity of the overflow valve body, and the pressure regulating spring is positioned between the steel ball and the upper end of the valve core; the overflow valve is characterized in that two-stage radial oil outlet is arranged on the valve core at intervals along the axis direction of the valve core, at least one first radial oil outlet hole is formed in the middle of the overflow valve body, two-stage oil return is formed between the first radial oil outlet hole in the overflow valve body and the two-stage radial oil outlet of the valve core, and the size of each stage of oil return changes from one-stage oil return hole to two-stage oil return holes along with the change of the lift range of the valve core.
In a preferred embodiment of the invention, the two-stage radial oil outlet on the valve core is divided into a first-stage radial oil outlet and a second-stage radial oil outlet, and the first-stage radial oil outlet is positioned below the second-stage radial oil outlet.
In a preferred embodiment of the invention, each stage of radial oil outlet on the valve core is provided with 2-3 second oil outlet holes, and the 2-3 second oil outlet holes are located on the same radial plane and are distributed circumferentially on the same radial plane.
In a preferred embodiment of the present invention, there are two first radial oil outlet holes, and the two first radial oil outlet holes are located on the same radial plane and are circumferentially distributed on the same radial plane.
In a preferred embodiment of the invention, because the excircle of the valve core is matched with the tiny clearance of the valve core hole of the relief valve body, friction damage is easy to generate in the process of up-and-down movement, a lubricating oil groove is formed on the excircle of the valve core, and the lubricating oil groove is positioned below the second-stage radial oil outlet; and an oil inlet hole is formed in the position, corresponding to the lubricating oil groove, of the overflow valve body, and the oil inlet hole is communicated with the lubricating oil groove. Fuel oil enters a lubricating oil groove of the outer circle of the valve core through an oil inlet hole in the overflow valve body, and the outer circle of the valve core and the valve core hole of the overflow valve body can be effectively lubricated, so that abrasion of the outer circle of the valve core in the reciprocating motion of the valve core hole of the overflow valve body is prevented.
In a preferred embodiment of the invention, a retaining ring groove is arranged on the valve core, a retaining ring is clamped in the retaining ring groove, the valve core is clamped by the retaining ring, the valve core moves up and down in the valve body in the fuel oil return process, and the valve core is clamped by the retaining ring, so that the valve core can be effectively prevented from slipping when the valve body of the overflow valve moves downwards.
In a preferred embodiment of the invention, a seal ring groove is arranged on the outer circle of the overflow valve body, the seal ring groove is positioned above the first radial oil outlet hole, and an overflow valve seal ring is assembled in the seal ring groove. The overflow valve sealing ring is assembled on the outer circle of the overflow valve body, and radial sealing is adopted to prevent fuel oil return from leaking, so that the fuel oil return is ensured to return to a low-pressure oil way of the diesel engine oil through the first radial oil outlet hole on the overflow valve body.
In a preferred embodiment of the invention, an external thread is arranged on the outer circle of the overflow valve body, the external thread is positioned below the first radial oil outlet hole and above the oil inlet hole, and a thread sealant is coated at the external thread.
Due to the adoption of the technical scheme, the invention discloses an oil return pressure device for starting fuel oil return, which consists of a steel ball and a pressure regulating spring. The steel ball controls the pressure of the pressure regulating spring through pressing the depth of an oil return cavity of the overflow valve body, so that the opening pressure of fuel oil return is controlled.
According to the invention, two stages of radial oil outlets are arranged on the valve core at different distances, and each stage of radial oil outlet is provided with 2-3 second radial oil outlet holes; the overflow valve body is also provided with a first radial oil outlet hole, two-stage fuel oil return is formed between the first radial oil outlet hole and two-stage radial oil outlet on the valve core, and the size of the oil return amount changes from first-stage oil return to second-stage oil return along with the change of the lift range of the valve core.
The overflow valve device for controlling the flow by the secondary opening pressure has a compact structure, can simultaneously control the pressure and the flow in the high-pressure oil rail, realizes the balance of the pressure and the flow, and ensures that a diesel engine provided with the high-pressure common rail fuel injection system has better stability, consistency, silence and reliability in the operation process.
Drawings
Fig. 1 is a sectional front view of a relief valve device of the present invention.
Fig. 2 is a cross-sectional view of the relief valve assembly of the present invention achieving a first level of oil return.
Fig. 3 is a cross-sectional view of an overflow valve assembly of the present invention achieving two-stage oil return.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below by combining the specific drawings.
Referring to fig. 1 to 3, the relief valve device with two-stage opening pressure to control flow rate is shown, which comprises a valve core 110, a relief valve body 100, a retainer ring 120, a relief valve seal ring 130, a pressure regulating spring 140 and a steel ball 150.
The valve core 110 is provided with a second oil inlet inner hole 170, an oil injection hole 171, a plurality of first-stage second radial oil outlet holes 180, a plurality of second-stage second radial oil outlet holes 190, a lubricating oil groove 210 and a retainer groove 121; the injection hole 171 communicates with the second oil inlet bore 170. The plurality of first-stage second radial oil outlet holes 180 are located on the same radial plane and are circumferentially distributed on the same radial plane to form first-stage radial oil outlet on the valve core 110, the plurality of second-stage second radial oil outlet holes 190 are located on the same radial plane and are circumferentially distributed on the same radial plane to form second-stage radial oil outlet on the valve core 110, and the first-stage radial oil outlet is located above the second-stage radial oil outlet. The lubrication groove 210 is located below the second stage radial oil outlet.
The overflow valve body 100 is provided with a first oil inlet inner hole 160, two oil inlet holes 220 leading to a lubricating oil groove 210 on the valve core 110, a valve core hole 111, two first radial oil outlet holes 200, an overflow valve body oil return cavity 230, a seal ring groove 131 and an external thread 101. The overflow valve body oil return cavity 230, the valve core hole 111 and the first oil inlet inner hole 160 are coaxially arranged and are sequentially communicated. The two first radial oil outlet holes 200 are located on the same radial plane at the middle position of the overflow valve body 100 and are distributed circumferentially on the same radial plane. The seal ring groove 131 and the external thread 101 are respectively positioned above and below the two first radial oil outlet holes 200. The two oil inlet holes 220 are located on the same radial plane below the external thread 101 and are circumferentially distributed on the same radial plane.
The outer circle of the valve core 110 is matched with the valve core hole 111 on the overflow valve body 100 in a close clearance mode, and fuel enters the second oil inlet inner hole 170 of the valve core 110 from the first oil inlet inner hole 160 on the overflow valve body 100; the return pressure rises, the valve core 110 moves upwards to compress the pressure regulating spring 140, and the valve core enters a primary oil return state (shown in the figure two), at this time, the fuel enters the overflow valve body return cavity 230 from the second oil inlet inner hole 170 on the valve core 110 through the primary second radial oil outlet hole 180, and the fuel in the overflow valve body return cavity 230 returns to the low-pressure oil path through the two first radial oil outlet holes 200 on the overflow valve body 100. The return pressure continues to rise, the valve core 110 continues to go up to compress the pressure regulating spring 140, the two-stage oil return state is entered, the fuel enters the overflow valve body oil return cavity 230 from the second oil inlet inner hole 170 on the valve core through the first-stage second radial oil outlet hole 180 and the second-stage second radial oil outlet hole 190, and the fuel in the overflow valve body oil return cavity 230 returns to the low-pressure oil path through the two first radial oil outlet holes 200 on the overflow valve body 100. The return oil pressure is reduced, the pressure regulating spring 140 rebounds back to the valve core 110 to close the second radial oil outlet hole 190, the return oil pressure continues to be reduced, and the pressure regulating spring 140 rebounds back to the valve core 110 further to close the first radial oil outlet hole 180. The retainer ring 120 is caught in the retainer groove 121 to retain the valve element 110, and prevent the valve element 110 from being separated from the relief valve body 100.
The overflow valve body 100 is coated with a uniform thread sealing glue at the external thread 101 so as to isolate fuel oil inlet and fuel oil return. Relief valve seal 130 is mounted in seal groove 131 and radially seals against a mounting body (not shown) to prevent return leakage.
In the process that the valve core 110 reciprocates in the valve core hole 111 of the overflow valve body 100, fuel flows to the lubricating oil groove 210 on the valve core 110 through the two oil inlet holes 220 on the overflow valve body 100, so that the contact surface of the valve core 110 and the valve core hole 111 of the overflow valve body 100 can be effectively lubricated, and the fatigue wear of the outer circle of the valve core 110 and the valve core hole 111 of the overflow valve body 100 is prevented.
Therefore, the pressure and the flow of the fuel in the high-pressure fuel rail can be controlled, the balance between the pressure and the flow is realized, and the stability, the consistency, the silence and the reliability of the diesel engine provided with the high-pressure common rail fuel injection system are better exerted in the operation process.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and are intended to illustrate the structural principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. An overflow valve device with flow controlled by two-stage opening pressure comprises an overflow valve body, a valve core, a pressure regulating spring and a steel ball, wherein an overflow valve body oil return cavity, a valve core hole and a first oil inlet inner hole which are coaxial are arranged in the overflow valve body; an oil injection hole and a second oil inlet inner hole are coaxially arranged in the valve core, and the oil injection hole is communicated with the second oil inlet inner hole; a steel ball and a pressure regulating spring are assembled in an oil return cavity of the overflow valve body, and the pressure regulating spring is positioned between the steel ball and the upper end of the valve core; the overflow valve is characterized in that two-stage radial oil outlet is arranged on the valve core at intervals along the axis direction of the valve core, at least one first radial oil outlet hole is formed in the middle of the overflow valve body, two-stage oil return is formed between the first radial oil outlet hole in the overflow valve body and the two-stage radial oil outlet of the valve core, and the size of each stage of oil return changes from one-stage oil return hole to two-stage oil return holes along with the change of the lift range of the valve core.
2. The two-stage opening pressure controlled flow relief valve device according to claim 1, wherein the two-stage radial oil outlet on the valve element is divided into a first-stage radial oil outlet and a second-stage radial oil outlet, and the first-stage radial oil outlet is located below the second-stage radial oil outlet.
3. The two-stage opening pressure controlled flow rate relief valve device according to claim 2, wherein each stage of radial oil outlet on the valve element has 2 to 3 second oil outlet holes, and the 2 to 3 second oil outlet holes are located on the same radial plane and are circumferentially distributed on the same radial plane.
4. The two-stage opening pressure controlled flow overflow valve device according to claim 3, wherein the number of the first radial oil outlet holes is two, and the two first radial oil outlet holes are located on the same radial plane and are circumferentially distributed on the same radial plane.
5. The overflow valve device with two-stage opening pressure control flow according to claim 4, wherein a lubricating oil groove is formed in the outer circle of the valve core, and the lubricating oil groove is positioned below the second-stage radial oil outlet; and an oil inlet hole is formed in the position, corresponding to the lubricating oil groove, of the overflow valve body, and the oil inlet hole is communicated with the lubricating oil groove.
6. The overflow valve device with two-stage opening pressure to control flow according to claim 5, wherein a retainer groove is provided on the valve core, and a retainer is clamped in the retainer groove and the retainer clamps the valve core.
7. The relief valve device with two-stage opening pressure to control flow according to claim 1, wherein a seal ring groove is arranged on the outer circle of the relief valve body, the seal ring groove is positioned above the first radial oil outlet hole, and a relief valve seal ring is assembled in the seal ring groove.
8. The two-stage opening pressure controlled flow relief valve device according to claim 7, wherein an external thread is provided on the outer circumference of said relief valve body, said external thread is located below said first radial oil outlet and above said oil inlet, and a thread sealant is coated on the external thread.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911414901.4A CN111075625A (en) | 2019-12-31 | 2019-12-31 | Overflow valve with two-stage opening pressure to control flow |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911414901.4A CN111075625A (en) | 2019-12-31 | 2019-12-31 | Overflow valve with two-stage opening pressure to control flow |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111075625A true CN111075625A (en) | 2020-04-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911414901.4A Pending CN111075625A (en) | 2019-12-31 | 2019-12-31 | Overflow valve with two-stage opening pressure to control flow |
Country Status (1)
| Country | Link |
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| CN (1) | CN111075625A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111396222A (en) * | 2020-04-30 | 2020-07-10 | 北油电控燃油喷射系统(天津)有限公司 | High pressure of adjustable pressure and flow is defeated oil pump for rail altogether |
| CN111810482A (en) * | 2020-07-29 | 2020-10-23 | 杭飞鹏 | Miniature pressure-adjustable hydraulic overflow valve |
| CN112797189A (en) * | 2021-01-29 | 2021-05-14 | 涌镇液压机械（上海）有限公司 | Reversing valve with sewage discharge capacity |
-
2019
- 2019-12-31 CN CN201911414901.4A patent/CN111075625A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111396222A (en) * | 2020-04-30 | 2020-07-10 | 北油电控燃油喷射系统(天津)有限公司 | High pressure of adjustable pressure and flow is defeated oil pump for rail altogether |
| CN111810482A (en) * | 2020-07-29 | 2020-10-23 | 杭飞鹏 | Miniature pressure-adjustable hydraulic overflow valve |
| CN112797189A (en) * | 2021-01-29 | 2021-05-14 | 涌镇液压机械（上海）有限公司 | Reversing valve with sewage discharge capacity |
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