CN211202919U - Leakage-free hydraulic system control valve - Google Patents
Leakage-free hydraulic system control valve Download PDFInfo
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- CN211202919U CN211202919U CN201921485871.1U CN201921485871U CN211202919U CN 211202919 U CN211202919 U CN 211202919U CN 201921485871 U CN201921485871 U CN 201921485871U CN 211202919 U CN211202919 U CN 211202919U
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- yoke bush
- front yoke
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Abstract
A non-leakage hydraulic system control valve comprises a rear yoke bush component, a pressure plate, an armature component, a guide bush, a control valve coil, a front yoke bush component, a flange, a flow valve component and a valve shell; the front yoke bush assembly is pressed into the flange; the armature assembly is fitted into the bore of the front yoke bush assembly; the guide sleeve is connected with the front yoke bush component and the rear yoke bush component through laser welding, a control valve coil is sleeved outside the guide sleeve, a pressing plate is placed on the upper portion of the control valve coil, and a valve shell is arranged outside the control valve coil and the pressing plate; the flow valve assembly is connected with the front yoke bush assembly through riveting. The utility model has the advantages that valve body and case adopt conical surface structure, and the leakproofness is good, can realize not having the leakage, simultaneously, can be applied to the common rail pump and realize fuel accurate measurement, can make hydraulic balance, and the process is steady.
Description
Technical Field
The utility model relates to a diesel engine high pressure common rail fuel pump technical field, in particular to fuel metering valve does not have hydraulic system control valve of leakage suitable for common rail pump.
Background
The adoption of a high-pressure common rail fuel injection system on a diesel engine is one of the main development trends of the diesel engine technology in the world nowadays and is an important means for reducing the emission of pollutants of the diesel engine. The high-pressure common rail fuel injection system can realize stable high-pressure injection and a perfect combustion process, and can also independently control the fuel injection characteristic, so that the dynamic property, the economical efficiency and the emission of the diesel engine are greatly improved.
The high-pressure common rail fuel system comprises a common rail pump, a common rail pipe, a fuel injector, an ECU, a sensor and the like. The fuel oil is input into the common rail pump from the oil tank through the fuel oil filter, is pressurized in the plunger cavity and then is sent into the common rail pipe, the pressure in the common rail pipe is controlled according to a pressure adjusting signal sent by the ECU, the fuel oil is input into the oil injector through the high-pressure oil pipe, and the oil injector injects the fuel oil into a combustion chamber of the diesel engine according to an instruction sent by the ECU. The common rail pump is an important component of a high-pressure common rail fuel injection system, the opening of the fuel metering valve is accurately controlled by the common rail pump so as to control the quantity of fuel entering a high-pressure oil way, and the accurate control of the pressure of the common rail is finally realized, so that the fuel metering valve has important influence on the performance of the common rail pump and is a key component for improving the performance of the common rail pump.
A hydraulic system valve of an existing common rail pump fuel metering valve can generate certain continuous leakage after being closed, leaked fuel enters a high-pressure oil way to cause the impact height of rail pressure, the rail pressure is unstable, the stability of fuel injection is influenced, and the performance of an engine can be deteriorated after long-term operation.
SUMMERY OF THE UTILITY MODEL
The utility model provides a leakage-free hydraulic system control valve, which comprises a back yoke bush component, a pressing plate, an armature component, a guide sleeve, a control valve coil, a front yoke bush component, a flange, a flow valve component and a valve shell; the front yoke bush assembly is pressed into the flange; the armature assembly is fitted into the bore of the front yoke bush assembly; the guide sleeve is connected with the front yoke bush component and the rear yoke bush component through laser welding, a control valve coil is sleeved outside the guide sleeve, a pressing plate is placed on the upper portion of the control valve coil, and a valve shell is arranged outside the control valve coil and the pressing plate; the flow valve assembly is connected with the front yoke bush assembly through riveting.
Further, the armature assembly includes an armature and an armature shaft that is pressed into the armature through a hole in the armature.
Further, the front yoke bush assembly includes a front yoke bush and a front yoke bush bearing pressed into the front yoke bush through a front yoke bush hole.
Furthermore, the flow valve assembly comprises a flow valve body, a valve core connecting rod, a valve core spring, a spring seat, a flow valve body oil inlet, an oil outlet control channel, a control valve outlet and a flow valve body upper hole; the flow valve body and the valve core are in conical surface sealing structures; the upper part of the valve core connecting rod is connected with the valve core through a valve core hole, and the flow valve body is arranged from the upper hole of the flow valve body; the lower part of the valve core connecting rod is connected with a valve core spring; the valve core spring is installed from an oil inlet of the flow valve body; the spring seat is pressed in through the oil inlet of the flow valve body, and the initial spring force is controlled through the depth of the pressed spring seat; the oil outlet control channel is connected with the oil inlet of the flow valve body and the outlet of the control valve; when the oil outlet control channel is closed, the sealing surface is a conical surface, and no leakage can be realized.
Furthermore, the depth range of the pressed spring seat is 0.01mm-0.05mm, and the corresponding initial spring force is 6.87-7.23N.
Further, the depth of the pressed spring seat is preferably 0.03mm, and the corresponding initial spring force is 7.09N.
The utility model discloses a hydraulic control valve is leading advantage be exactly adopt the conical surface sealed, the leakproofness is good, can realize zero leakage, prevents to press to rush to the height because let out the too big performance that influences the pump of leakage quantity and then cause negative effects to the engine performance, if the rail pressure, the rail pressure is undulant shakiness, and the sprayer sprays the uniformity poor, and the accelerated ageing and the fault rate of fuel oil system parts such as pump, rail, sprayer increase. Meanwhile, the control valve is applied to the common rail pump to realize accurate fuel metering, hydraulic balance can be achieved, and the process is stable.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural view of the armature assembly of the present invention.
Fig. 3 is a schematic structural view of the front yoke bush assembly of the present invention.
Fig. 4 is a schematic structural diagram of the outlet of the control valve of the flow valve assembly of the present invention in a fully opened state.
Fig. 5 is a schematic structural diagram of the outlet closed state of the control valve of the flow valve assembly of the present invention.
Fig. 6 is a flow rate characteristic graph of the present invention.
Detailed Description
Referring to fig. 1, 2, 3, 4 and 5, a leak-free hydraulic system control valve includes a back yoke bush assembly 1, a pressure plate 2, an armature assembly 3, a guide bush 4, a control valve coil 5, a front yoke bush assembly 6, a flange 7, a flow valve assembly 8, a valve housing 9; the front yoke bush assembly 6 is pressed into the flange 7; the armature assembly 3 is fitted into the bore of the front yoke bush assembly 6; the guide sleeve 4 is connected with the front yoke bush component 6 and the rear yoke bush component 1 through laser welding, a control valve coil 5 is sleeved outside the guide sleeve 4, a pressing plate 2 is placed on the upper portion of the control valve coil 5, and a valve shell 9 is arranged outside the control valve coil 5 and the pressing plate 2; the flow valve assembly 8 is riveted to the front yoke bush assembly 6.
The armature assembly 3 comprises an armature 31 and an armature shaft 32, the armature shaft 32 being pressed into the armature 31 through a hole in the armature 31.
The front yoke bush assembly 6 includes a front yoke bush 61 and a front yoke bush bearing 62, and the front yoke bush bearing 62 is pressed into the front yoke bush 61 through a hole of the front yoke bush 61.
The flow valve assembly 8 comprises a flow valve body 81, a valve core 82, a valve core connecting rod 83, a valve core spring 84, a spring seat 85, a flow valve body oil inlet 86, an oil outlet control channel 87, a control valve outlet 88 and a flow valve body upper hole 89; the flow valve body 81 and the valve core 82 are in conical surface sealing structures; the upper part of the valve core connecting rod 83 is connected with the valve core 82 through a valve core hole, and a flow valve body 81 is arranged in the flow valve body upper hole 89; the lower part of the valve core connecting rod 83 is connected with a valve core spring 84; the spool spring 84 is loaded from a flow valve body inlet port 86; the spring seat 85 is pressed in through the flow valve body oil inlet 86, and the initial spring force is controlled through the depth of the pressed spring seat 85; the oil outlet control channel 87 connects the flow valve body oil inlet 86 and the control valve outlet 88; when the oil outlet control passage 87 is closed, the sealing surface is a tapered surface, and leakage-free operation can be achieved.
The utility model discloses the oil feed valve bottom has designed spring holder 85, and through the degree of depth of impressing of adjusting spring holder 85, the size of adjustable spring initial force corresponds the electromagnetic force, and then can adjust solenoid valve's flow characteristic, still can guarantee the uniformity between different valves through the fine setting to guarantee the stability of wholeness ability. When the depth range of the pressed spring seat is 0.01mm-0.05mm, the corresponding initial spring force is 6.87-7.23N.
The depth of the pressed spring seat is preferably 0.03mm, and the corresponding initial spring force is 7.09N.
FIG. 6 is a flow characteristic curve of the present invention, which can be adjusted by adjusting the depth of the spring seat, and the flow value when the test current is 1500mA is passed in the adjustment process, so that the flow value is between the upper limit flow value of 50L/h and the lower limit flow value of 20L/h, and the flow at this point is increased by pressing the spring seat in, the valve can reduce the leakage rate to 0.02L/h through the conical surface seal, and the sealing effect is good, which is the 0.18L/h index required by the common seal.
The hydraulic system control valve is a normally open valve, and referring to fig. 4, when the control valve coil 5 is not energized, the valve element 82 is in contact with the contact surface of the front yoke bush 61 and is stationary under the action of the valve element spring 84, and the control valve outlet 88 is in a fully open state at this time, and the flow rate is maximum. Referring to fig. 5, after the control valve coil 5 is energized, under the action of electromagnetic force, the armature 31 and the armature shaft 32 press the valve element spring 84 to move downward against the valve element 82 until the electromagnetic force and the spring force are equal, the side surface of the valve element 82 is attached to the control valve outlet 88 during the movement, and as the current increases, the area of the control valve outlet 88 decreases until the control valve outlet 88 is completely closed. The current for completely closing the control valve outlet 88 is called control valve closing current, the control valve closing current is controlled to be 1.75-2A, the area of the control valve outlet 88 can be accurately controlled, and therefore the flow of the control valve outlet 88 can be accurately controlled.
When the electromagnetic valve works, referring to fig. 6, the initial state has the largest flow, the coil 5 of the control valve generates a downward acting force on the armature assembly 3 after being electrified, the armature shaft 32 pushes the valve core 82 to press the spring 84 to move downward until the electromagnetic force and the spring force are balanced, the downward displacement of the valve core 82 is determined by the magnitude of the current, the area of the outlet 88 of the control valve is determined, the magnitude of the flow is further determined, and the accurate control of the flow can be realized.
Claims (6)
1. A leak-free hydraulic system control valve, characterized by: the magnetic control valve comprises a rear yoke bush component (1), a pressure plate (2), an armature component (3), a guide bush (4), a control valve coil (5), a front yoke bush component (6), a flange (7), a flow valve component (8) and a valve shell (9); the front yoke bush component (6) is pressed into the flange (7); the armature component (3) is arranged in a hole of the front yoke bush component (6); the guide sleeve (4) is connected with the front yoke bush component (6) and the rear yoke bush component (1) through laser welding, a control valve coil (5) is sleeved outside the guide sleeve (4), a pressing plate (2) is placed on the upper portion of the control valve coil (5), and a valve shell (9) is arranged outside the control valve coil (5) and the pressing plate (2); the flow valve assembly (8) is connected with the front yoke bush assembly (6) through riveting.
2. A leak-free hydraulic system control valve as defined in claim 1, wherein: the armature assembly (3) comprises an armature (31) and an armature shaft (32), wherein the armature shaft (32) is pressed into the armature (31) through a hole on the armature (31).
3. A leak-free hydraulic system control valve as defined in claim 1, wherein: the front yoke bush assembly (6) comprises a front yoke bush (61) and a front yoke bush bearing (62), and the front yoke bush bearing (62) is pressed into the front yoke bush (61) through a front yoke bush (61) hole.
4. A leak free hydraulic system control valve as defined in any one of claims 1 to 3, wherein: the flow valve assembly (8) comprises a flow valve body (81), a valve core (82), a valve core connecting rod (83), a valve core spring (84), a spring seat (85), a flow valve body oil inlet (86), an oil outlet control channel (87), a control valve outlet (88) and a flow valve body upper hole (89); the flow valve body (81) and the valve core (82) are in conical surface sealing structures; the upper part of the valve core connecting rod (83) is connected with the valve core (82) through a valve core hole, and the flow valve body (81) is arranged in the flow valve body upper hole (89); the lower part of the valve core connecting rod (83) is connected with a valve core spring (84); the spool spring (84) is loaded from a flow valve body oil inlet (86); the spring seat (85) is pressed in through the flow valve body oil inlet (86), and the initial spring force is controlled through the depth of the pressed spring seat (85); the oil outlet control channel (87) is connected with the flow valve body oil inlet (86) and the control valve outlet (88); when the oil outlet control channel (87) is closed, the sealing surface is a conical surface, and no leakage can be realized.
5. A leak-free hydraulic system control valve as defined in claim 4, wherein: the depth range of the pressed spring seat (85) is 0.01mm-0.05mm, and the corresponding initial spring force is 6.87-7.23N.
6. A leak-free hydraulic system control valve as defined in claim 5, wherein: the depth of the pressed spring seat (85) is preferably 0.03mm, and the corresponding initial spring force is 7.09N.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921485871.1U CN211202919U (en) | 2019-09-09 | 2019-09-09 | Leakage-free hydraulic system control valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921485871.1U CN211202919U (en) | 2019-09-09 | 2019-09-09 | Leakage-free hydraulic system control valve |
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| Publication Number | Publication Date |
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| CN211202919U true CN211202919U (en) | 2020-08-07 |
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| CN201921485871.1U Active CN211202919U (en) | 2019-09-09 | 2019-09-09 | Leakage-free hydraulic system control valve |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110513497A (en) * | 2019-09-09 | 2019-11-29 | 思达耐精密机电（常熟）有限公司 | A kind of No leakage hydraulic systems control valve |
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2019
- 2019-09-09 CN CN201921485871.1U patent/CN211202919U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110513497A (en) * | 2019-09-09 | 2019-11-29 | 思达耐精密机电（常熟）有限公司 | A kind of No leakage hydraulic systems control valve |
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