CN113090428A - Integrated oil outlet valve fastening seat for high-pressure common rail pump - Google Patents
Integrated oil outlet valve fastening seat for high-pressure common rail pump Download PDFInfo
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- CN113090428A CN113090428A CN202010016240.6A CN202010016240A CN113090428A CN 113090428 A CN113090428 A CN 113090428A CN 202010016240 A CN202010016240 A CN 202010016240A CN 113090428 A CN113090428 A CN 113090428A
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- outlet valve
- pressure regulating
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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
- F02M59/462—Delivery 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
- 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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
- Safety Valves (AREA)
Abstract
The invention discloses an integrated oil outlet valve fastening seat used on a high-pressure common rail pump, which comprises an oil outlet valve fastening seat body arranged in the upper end of a plunger sleeve and an oil outlet valve arranged in the oil outlet valve fastening seat body, wherein a plunger hole is formed in the plunger sleeve from top to bottom; the oil outlet valve is characterized by further comprising a buffer valve arranged above the oil outlet valve and a mechanical pressure regulating valve arranged in the side wall of the oil outlet valve tight seat body. The pressure of the common rail is controlled in an open loop mode through the pressure regulating valve integrated on the oil outlet valve fastening seat, and the pressure wave crest in the process of pressing oil by the plunger and the pressure echo generated when the oil sprayer stops injecting are balanced through the pressure buffer valve integrated on the oil outlet valve fastening seat, so that a rail pressure closed-loop control module in the original common rail system is replaced, and the cost of the common rail system is greatly reduced.
Description
Technical Field
The invention relates to the field of diesel engine fuel systems, in particular to an integrated oil outlet valve fastening seat used on a high-pressure common rail pump.
Background
With the stricter tail gas emission of diesel engines in China, a high-pressure common rail fuel system becomes a mainstream solution of the diesel engine fuel system in the market. At present, a commonly-used high-pressure common rail system adopts a pressure sensor and an electronic pressure regulating valve to control the rail pressure of the common rail system, see (structure and principle of an electronic control diesel engine of yellow-jinggang [ M ] people's traffic publisher 2008). There are two schemes currently in common use: the method comprises the steps that an Electronic Control Unit (ECU) of the common rail system monitors the fuel pressure in a common rail pipe through a common rail pressure sensor arranged on the common rail pipe, and then controls the opening of an oil inlet metering valve on a common rail pump, so that the fuel quantity entering a plunger cavity of the common rail pump is adjusted in real time, and the fuel pressure in the common rail pipe is adjusted; the second method is that the plunger cavity of the common rail pump always has the maximum oil inlet amount, then an electronic control unit ECU of the common rail system monitors the fuel pressure in the common rail pipe through a common rail pressure sensor arranged on the common rail pipe, and then controls the opening of a high-pressure relief valve on the common rail pump to release redundant high-pressure fuel, thereby regulating the fuel pressure in the common rail pipe. The two methods both use a common rail pressure sensor and an electronic pressure regulating valve, and simultaneously, a mechanical safety valve is additionally arranged on the common rail pipe, so that the condition that the pressure of the common rail pipe is sharply increased to exceed the allowable pressure of the system to cause danger when a high-pressure fuel pressure regulating system in the common rail pipe fails is prevented. Both of these rail pressure control schemes are costly and unacceptable to customers in some low cost high pressure rail system applications.
Most of small horsepower diesel engines in China, particularly traditional horizontal bar and double cylinder diesel engines, are low in price, and an expensive common rail fuel system accounts for more than half of the cost of the diesel engines. Therefore, how to reduce the cost of the common rail system is significant for popularizing the high-pressure common rail fuel system.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides an integrated oil outlet valve tight seat which is simple in structure and low in cost and is used for a high-pressure common rail pump to realize the balance of common rail pressure through a mechanical structure.
In order to achieve the purpose, the invention is implemented according to the following technical scheme:
an integrated oil outlet valve tightening seat used on a high-pressure common rail pump comprises an oil outlet valve tightening seat body arranged in the upper end of a plunger sleeve and an oil outlet valve arranged in the oil outlet valve tightening seat body, wherein a plunger hole is formed in the plunger sleeve from top to bottom, a common rail pump plunger is assembled in the plunger hole in a sliding manner, an oil outlet valve mounting cavity is formed in the oil outlet valve tightening seat body, the oil outlet valve is arranged in the oil outlet valve mounting cavity, an inlet of the oil outlet valve is communicated with the plunger hole, an oil outlet hole is formed in the upper end of the oil outlet valve tightening seat body, and an outlet of the oil outlet valve is communicated with; the oil outlet valve is characterized by further comprising a buffer valve arranged above the oil outlet valve and a mechanical pressure regulating valve arranged in the side wall of the oil outlet valve fastening seat body, wherein the buffer valve comprises a buffer valve core, a buffer valve spring and a buffer valve spring gasket, the upper end of the oil outlet valve installation cavity is provided with a buffer valve installation cavity with the aperture smaller than that of the oil outlet valve installation cavity, the buffer valve core is assembled in the buffer valve installation cavity in a sliding mode, the buffer valve core is provided with a lower throttling hole, the lower end of the buffer valve spring is fixed at the upper end of the buffer valve core, the buffer valve spring gasket is fixed at the top end of the buffer valve installation cavity, the center of the buffer valve spring gasket is provided with an upper throttling hole; the oil duct hole of crossing that communicates with mechanical type pressure regulating valve's import is seted up to cushion valve installation cavity one side wall, thereby the cushion valve core plugs up the oil duct hole and only when cushion valve core lower extreme pressure is greater than the pretightning force that the cushion valve spring set for when the cushion valve core moves to cushion valve installation cavity top and makes the cushion valve core not block up the oil duct hole, mechanical type pressure regulating valve's export is connected to the low pressure oil circuit that flows back to the common rail pump through setting up in the oil return way that the tight seat of delivery valve is originally internal.
Further, the mechanical pressure regulating valve comprises a pressure regulating valve mounting seat, a pressure regulating valve seat, a ball valve seat, a pressure regulating spring and a pressure regulating spring gasket, wherein the pressure regulating valve mounting seat is fixed in the side wall of the oil outlet valve fastening seat body, the pressure regulating valve seat is fixed at the front end of the pressure regulating valve mounting seat, the front end surface of the pressure regulating valve seat completely blocks the oil passage hole, the front end surface of the pressure regulating valve seat is provided with a pressure regulating valve seat throttling hole communicated with the oil passage hole, a ball valve seat mounting cavity is arranged in the pressure regulating valve mounting seat, the ball valve seat is assembled in the ball valve seat mounting cavity in a sliding manner, the rear end of the ball valve seat is fixedly provided with the pressure regulating spring, the rear end of the pressure regulating spring is fixed on the pressure regulating spring gasket; the ball is fixed at the front end of the ball valve seat, the rear end face of the pressure regulating valve seat is provided with a ball sealing conical surface, and the throttling hole of the pressure regulating valve seat is blocked when the ball is tightly attached to the ball sealing conical surface; and a pressure regulating valve low-pressure cavity is arranged between the pressure regulating valve seat and the ball valve seat and is communicated with the oil return channel.
Further, the mechanical pressure regulating valve comprises a pressure regulating valve mounting seat, a pressure regulating valve seat, a conical plunger, a plunger valve seat, a pressure regulating spring and a pressure regulating spring gasket, the pressure regulating valve mounting seat is fixed in the side wall of the oil outlet valve fastening seat body, the pressure regulating valve seat is fixed at the front end of the pressure regulating valve mounting seat, the front end face of the pressure regulating valve seat completely blocks the oil passage hole, the front end face of the pressure regulating valve seat is provided with a conical pressure regulating valve seat orifice communicated with the oil passage hole, the rear end of the conical pressure regulating valve seat orifice is provided with a conical plunger hole, the pressure regulating valve mounting seat is internally provided with a plunger valve seat mounting cavity, the plunger valve seat is assembled in the plunger valve seat mounting cavity, the rear end of the plunger valve seat is fixedly provided with a pressure regulating spring, the rear end of the pressure regulating spring is fixed on a pressure regulating spring gasket, and the pressure regulating; the conical plunger is fixed at the front end of the plunger valve seat, the conical plunger is matched with the conical plunger hole, and the orifice of the conical pressure regulating valve seat is blocked when the conical plunger is tightly attached to the conical plunger hole; and a pressure regulating valve low-pressure cavity is arranged between the plunger valve seat and the pressure regulating valve seat and is communicated with the oil return channel.
Preferably, the oil outlet valve comprises an oil outlet valve seat fixed at the bottom of the oil outlet valve installation cavity, an oil outlet valve core arranged in the oil outlet valve installation cavity and located above the oil outlet valve seat, an oil outlet valve spring fixed at the upper end of the oil outlet valve core, and an oil outlet valve spring gasket fixed at the top end of the oil outlet valve installation cavity, the upper end of the oil outlet valve spring is fixed at the lower end of the oil outlet valve spring gasket, an oil outlet valve inlet communicated with the plunger hole is formed in the lower end of the oil outlet valve seat, an oil outlet valve sealing surface used for plugging the oil outlet valve core on the oil outlet valve seat is arranged at the upper end of the oil outlet valve seat, an oil outlet valve outlet is formed in.
Preferably, the buffer valve core is of a U-shaped structure or a convex shape, so that a buffer valve spring can be conveniently installed, and meanwhile, the oil passage hole can be conveniently plugged on two sides of the buffer valve core.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention designs an oil outlet valve tight seat with a mechanical pressure regulating valve, which is characterized in that the oil outlet valve tight seat of a common rail pump is provided with the mechanical pressure regulating valve, and the mechanical pressure regulating valve adopts a mechanical open-loop control mode (matched spring pretightening force, throttle valve opening lift, throttle orifice flow coefficient and buffer valve parameters are designed to control the pressure of a common rail system under different rotating speeds and oil injection quantities) to replace a closed-loop control mode which adopts a pressure sensor and an electronic pressure regulating valve to control the rail pressure of the common rail system in the original common rail system, thus simplifying a rail pressure closed-loop control module (rail pressure signal identification, electronic regulating valve drive and rail pressure control PID model) in an electronic control unit ECU of the common rail system, and also omitting a rail pressure sensor, an electronic regulating valve (an oil inlet valve and a DRV valve) and a mechanical safety valve on a common rail pipe in the common rail system, the cost of the high-pressure common rail system is greatly reduced, and the low-cost application requirement of the low-horsepower diesel high-pressure common rail system is met.
2. The invention is also provided with a buffer valve above the oil outlet valve, which can balance the pressure wave crest in the process of pressing oil by the plunger and the pressure echo generated when the oil injector stops injecting, thereby improving the pressure fluctuation of the common rail pressure controlled by the mechanical open loop.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of another embodiment of the present invention.
FIG. 3 is a schematic diagram of another embodiment of a trim valve cartridge according to the present invention.
In the figure: 1. an outlet valve tight seat body; 1-1, an oil outlet valve installation cavity; 1-2, oil passage holes; 1-3 oil outlet holes; 1-4, an oil return channel; 2. a pressure regulating valve mounting seat; 3. a pressure regulating valve seat; 3-1, a pressure regulating valve seat orifice; 3-1', a conical pressure regulating valve seat orifice; 3-2, sealing the conical surface by a ball; 3-2' and a conical plunger hole; 3-3, a low-pressure cavity of a pressure regulating valve; 4. a ball valve; 4', a conical plunger; 5. a ball valve seat; 5', a plunger valve seat; 6. a pressure regulating spring; 7. a pressure regulating spring washer; 8. an oil outlet valve; 8-1, an oil outlet valve core; 8-2, an oil outlet valve seat; 8-3, an oil outlet valve spring; 8-4, oil outlet valve sealing surface; 8-5, an oil outlet valve inlet; 8-6, an oil outlet valve spring gasket; 8-7, outlet of the oil outlet valve; 9. a buffer valve core; 9-1, lower orifice; 9-2, an upper orifice; 10. a cushion valve spring; 11. a cushion valve spring spacer; 12. a plunger sleeve; 13. a common rail pump plunger; 14. a plunger bore.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. The specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
Example 1
As shown in fig. 1, the integrated outlet valve seat for a high pressure common rail pump of the present embodiment includes an outlet valve seat body 1 installed in the upper end of a plunger sleeve 12, and an outlet valve 8 installed in the outlet valve seat body 1, a plunger hole 14 is formed in the plunger sleeve 12 from top to bottom, a common rail pump plunger 13 is slidably assembled in the plunger hole 14, an outlet valve installation cavity 1-1 is formed in the outlet valve seat body 1, an outlet hole 1-3 is formed in the upper end of the outlet valve seat body 1, and an outlet valve 8 is installed in the outlet valve installation cavity 1-1, wherein the outlet valve 8 is an outlet valve seat 8-2 fixed at the bottom of the outlet valve installation cavity 1-1, and an outlet valve core 8-1 disposed in the outlet valve installation cavity 1-1 and located above the outlet valve seat 8-2 is directly purchased from the market, An oil outlet valve spring 8-3 fixed at the upper end of the oil outlet valve core 8-1 and an oil outlet valve spring gasket 8-6 fixed at the top end of the oil outlet valve installation cavity 1-1, wherein the upper end of the oil outlet valve spring 8-3 is fixed at the lower end of the oil outlet valve spring gasket 8-6, the lower end of the oil outlet valve seat 8-2 is provided with an oil outlet valve inlet 8-5 communicated with the plunger hole 14, the upper end of the oil outlet valve seat 8-2 is provided with an oil outlet valve sealing surface 8-4 for sealing the oil outlet valve seat 8-2 by the oil outlet valve core 8-1, and the oil outlet valve spring gasket 8-6 is provided with an oil outlet valve; the oil outlet valve is characterized by further comprising a buffer valve arranged above the oil outlet valve 8 and a mechanical pressure regulating valve arranged in the side wall of the oil outlet valve tight seat body 1, wherein the buffer valve comprises a buffer valve core 9, a buffer valve spring 10 and a buffer valve spring gasket 11, the upper end of an oil outlet valve installation cavity 1-1 is provided with a buffer valve installation cavity with the aperture smaller than that of the oil outlet valve installation cavity 1-1, an oil outlet valve outlet 8-7 is communicated with the buffer valve installation cavity, the buffer valve core 9 is slidably assembled in the buffer valve installation cavity, the buffer valve core 9 is provided with a lower throttling hole 9-1, and the buffer valve core 9 is of a U-shaped structure, so that the buffer valve spring 10 can be conveniently installed, the lower end of the buffer valve spring 10 is fixed in a U-shaped groove in the upper end of the buffer valve core 9; of course, the buffer valve core 9 can also be in a convex shape, and as shown in fig. 3, the buffer valve spring 10 can be sleeved on the upper part of the convex shape; a buffer valve spring gasket 11 is fixed at the top end of the buffer valve installation cavity, an upper throttling hole 9-2 communicated with the oil outlet hole 1-3 is formed in the buffer valve spring gasket 11, and the upper end of a buffer valve spring 10 is fixed on the lower end face of the buffer valve spring gasket 11; an oil passage hole 1-2 communicated with an inlet of a mechanical pressure regulating valve is formed in one side wall of the buffer valve mounting cavity, the buffer valve core 9 blocks the oil passage hole, and the buffer valve core 9 moves towards the upper part of the buffer valve mounting cavity so that the buffer valve core 9 does not block the oil passage hole 1-2 only when the pressure applied to the lower end of the buffer valve core 9 is larger than the pre-tightening force set by the buffer valve spring 10, the mechanical pressure regulating valve comprises a pressure regulating valve mounting seat 2, a pressure regulating valve seat 3, a ball 4, a ball valve seat 5, a pressure regulating spring 6 and a pressure regulating spring gasket 7, the pressure regulating valve mounting seat 2 is fixed in the side wall of the oil outlet valve fastening seat body 1, the pressure regulating valve seat 3 is fixed at the front end of the pressure regulating valve mounting seat 2, the front end face of the pressure regulating valve seat 3 completely blocks the oil passage hole 1-2, and a pressure regulating valve seat throttling hole 3-1 communicated with the oil passage hole 1-, a ball valve seat mounting cavity is formed in the pressure regulating valve mounting seat 2, the ball valve seat 5 is assembled in the ball valve seat mounting cavity, a pressure regulating spring 6 is fixed at the rear end of the ball valve seat 5, the rear end of the pressure regulating spring 6 is fixed on a pressure regulating spring gasket 7, and the pressure regulating spring gasket 7 is fixed on two side walls of the ball valve seat mounting cavity; the ball 4 is fixed at the front end of the ball valve seat 5, the rear end face of the pressure adjusting valve seat 3 is provided with a ball sealing conical surface 3-2, and the ball 4 blocks the orifice 3-1 of the pressure adjusting valve seat when clinging to the ball sealing conical surface 3-2; a pressure regulating valve low-pressure cavity 3-3 is arranged between the pressure regulating valve seat 3 and the ball valve seat 5, the pressure regulating valve low-pressure cavity 3-3 is communicated with an oil return channel 1-4 arranged in the oil outlet valve tight seat body 1, and the oil return channel 1-4 is connected to a low-pressure oil way which flows back to the common rail pump.
The specific working principle of this embodiment is as follows, as shown in fig. 1:
after high-pressure fuel oil generated by upward compression of the plunger 13 of the common rail pump overcomes the pre-tightening force of the oil outlet valve spring 8-3 by the upward hydraulic pressure of the high-pressure fuel oil acting on the oil outlet valve core 8-1, the oil outlet valve core 8-1 is jacked upwards, the high-pressure fuel oil enters the oil outlet valve installation cavity 1-1, then flows through the lower throttling hole 9-1 and the upper throttling hole 9-2 on the buffer valve core 9, and then flows to the oil injector through the oil outlet hole 1-3 on the oil outlet valve fastening seat body 1, so that the high-pressure fuel oil is provided for the oil injector.
During the process of pressing oil on the plunger 13 of the common rail pump, the compressed fuel oil generates an important pressure wave peak due to the rapid rise of the oil pressing cam, and the pressure rises rapidly, and then the buffer valve arranged above the oil outlet valve 8 starts to work. When the common rail pump plunger compresses fuel to cause the fuel pressure to rise sharply, because the lower throttling hole 9-1 on the buffer valve core 9 has throttling effect (the matching part between the buffer valve core 9 and the oil outlet valve fastening seat body 1 plays a role of sealing fuel), pressure difference can be generated above and below the lower throttling hole 9-1 (the fuel pressure at the lower part of the lower throttling hole 9-1 is larger than the fuel pressure at the upper part of the throttling hole 9-1). Due to the pressure difference, an upward hydraulic pressure can be generated to jack the buffer valve core 9 upwards, the oil passage hole 1-2 is opened, high-pressure fuel oil is discharged through the pressure regulating valve, and the fuel oil pressure is reduced, and the specific process is as follows:
when the buffer valve core is jacked up and opened under the action of hydraulic pressure in the oil outlet valve installation cavity 1-1, high-pressure fuel in the oil outlet valve installation cavity 1-1 is divided into two paths, one path of high-pressure fuel flows to an oil injector through an oil outlet hole 1-3 on an oil outlet valve fastening seat 1, the other path of high-pressure fuel enters a pressure regulating valve seat 3 through an oil passage hole 1-2 on the oil outlet valve fastening seat 1, the high-pressure fuel generates a hydraulic pressure force to act on a ball 4 after passing through a pressure regulating orifice 3-1, when the pressure of the high-pressure fuel rises, the hydraulic pressure acting on the ball 4 rises, when the hydraulic pressure force is larger than the pre-tightening force set by a pressure regulating spring 6 (the pre-tightening force can be adjusted by changing the thickness of a pressure regulating spring gasket 7), the ball 4 is jacked away from a ball sealing conical surface 3-2, and the high-pressure fuel is discharged to a pressure regulating valve, and finally, the oil flows back to a low-pressure oil way of the common rail pump through an oil return way 1-4 arranged on the oil outlet valve fastening seat 1.
When the common rail pump plunger 13 stops supplying oil downwards or the oil injector injects oil, the fuel pressure in the oil outlet valve installation cavity 1-1 is reduced, the hydraulic pressure acting on the hydraulic pressure on the ball 4 is also reduced, but the hydraulic pressure is smaller than the pre-tightening force set by the pressure regulating spring 6, the ball 4 falls on the ball sealing conical surface 3-2 again under the action of the pressure regulating spring 6, the oil drainage loop of the pressure regulating valve is closed, and oil drainage is stopped.
When the fuel injector stops injecting, the high-pressure fuel flowing at high speed continues to flow forwards due to the inertia effect, the nozzle of the fuel injector is closed at the moment, the high-pressure fuel flowing forwards continuously is squeezed inside the fuel injector, and a generated pressure echo is transmitted to the pump end along the high-pressure fuel pipe in the reverse direction. The pressure wave reaches the upper part of the buffer valve core 9 through the oil outlet holes 1-3 on the oil outlet valve fastening seat body 1, the buffer valve core 9 moves downwards under the pushing of the pressure wave, and the pressure wave is balanced and disappears at the moment, so that the pressure wave generated when the oil sprayer stops spraying can be eliminated through the buffer valve.
Example 2
The difference between the present embodiment and embodiment 1 is that, as shown in fig. 2, the mechanical pressure regulating valve of the present embodiment includes a pressure regulating valve mounting seat 2, a pressure regulating valve seat 3, a conical plunger 4 ', a plunger valve seat 5', a pressure regulating spring 6 and a pressure regulating spring gasket 7, the pressure regulating valve mounting seat 2 is fixed in the sidewall of the outlet valve seat body 1, the pressure regulating valve seat 3 is fixed at the front end of the pressure regulating valve mounting seat 2, the front end face of the pressure regulating valve seat 3 completely blocks the oil passage hole 1-2, the front end face of the pressure regulating valve seat 3 is provided with a conical pressure regulating valve seat throttling hole 3-1 'communicated with the oil passage hole 1-2, the rear end of the conical pressure regulating valve seat throttling hole 3-1' is provided with a conical plunger hole 3-2 ', a plunger valve seat mounting cavity is provided in the pressure regulating valve mounting seat 2, and the plunger 5' is assembled, the rear end of the plunger valve seat 5' is fixed with a pressure regulating spring 6, the rear end of the pressure regulating spring 6 is fixed on a pressure regulating spring gasket 7, and the pressure regulating spring gasket 7 is fixed on the rear end wall of the plunger valve seat installation cavity; the conical plunger 4 ' is fixed at the front end of the plunger valve seat 5 ', the conical plunger 4 ' is matched with the conical plunger hole 3-2 ', and the conical pressure regulating valve seat orifice 3-1 ' can be blocked when the conical plunger 4 ' is tightly attached to the conical plunger hole 3-2 '; a pressure regulating valve low-pressure cavity 3-3 is arranged between the plunger valve seat 5' and the pressure regulating valve seat 3, the pressure regulating valve low-pressure cavity 3-3 is communicated with an oil return channel 1-4 arranged in the oil outlet valve tight seat body 1, and the oil return channel 1-4 is connected to a low-pressure oil way which flows back to the common rail pump.
The specific working principle of this embodiment is as follows, as shown in fig. 2:
after high-pressure fuel oil generated by upward compression of the plunger 13 of the common rail pump overcomes the pre-tightening force of the outlet valve spring 8-3 by the upward hydraulic pressure of the high-pressure fuel oil acting on the outlet valve core 8-1, the outlet valve core 8-1 is pushed upwards, the high-pressure fuel oil enters the outlet valve installation cavity 1-1, then flows through the lower throttling hole 9-1 on the buffer valve core 9 and flows to the oil injector through the oil outlet hole 1-3 on the outlet valve fastening seat body 1, and the high-pressure fuel oil is provided for the oil injector.
During the process of pressing oil on the plunger 13 of the common rail pump, due to the rapid rise of the oil pressing cam, the compressed fuel generates an important pressure wave peak, the pressure rises rapidly, and the buffer valve arranged above the oil outlet valve starts to work. When the common rail pump plunger 13 compresses the fuel to cause the fuel pressure to rise sharply, because the lower throttling hole 9-1 on the buffer valve core 9 has throttling effect (the matching part between the buffer valve core 9 and the oil outlet valve fastening seat body 1 plays a role of sealing the fuel), pressure difference can be generated above and below the lower throttling hole 9-1 (the fuel pressure at the lower part of the lower throttling hole 9-1 is larger than the fuel pressure at the upper part of the lower throttling hole 9-1). Due to the pressure difference, an upward hydraulic pressure can be generated to jack the buffer valve core 9 upwards, the oil passage hole 1-2 is opened, high-pressure fuel oil is discharged through the pressure regulating valve, and the fuel oil pressure is reduced, and the specific process is as follows:
when the buffer valve core 9 is jacked up and opened under the action of hydraulic pressure in the oil outlet valve installation cavity 1-1, high-pressure fuel in the oil outlet valve installation cavity 1-1 is divided into two paths, one path of high-pressure fuel flows to an oil injector through an oil outlet hole 1-3 on an oil outlet valve fastening seat 1, the other path of high-pressure fuel enters a pressure regulating valve seat 3 through an oil passage hole 1-2 on the oil outlet valve fastening seat 1, the high-pressure fuel generates a hydraulic pressure force to act on a conical plunger 4 ' after passing through a throttling hole 3-1 ' of the conical pressure regulating valve seat, when the pressure of the high-pressure fuel is increased, the hydraulic pressure acting on the conical plunger 4 ' is increased, and when the hydraulic pressure force is greater than pre-tightening force set by a pressure regulating spring 6 (the pre-tightening force can be adjusted by changing the thickness of a pressure regulating spring gasket 7), the conical plunger 4, high-pressure fuel oil is discharged to a low-pressure cavity 3-3 of the pressure regulating valve along the conical plunger hole 3-2' and finally flows back to a low-pressure oil way of the common rail pump through an oil return channel 1-4 arranged on the oil outlet valve tight seat 1.
When the common rail pump plunger 13 stops oil supply or the oil injector passes through oil injection, the fuel pressure in the oil outlet valve installation cavity 1-1 is reduced, the hydraulic pressure acting on the hydraulic pressure on the conical plunger 4 ' is also reduced, but the hydraulic pressure is smaller than the pre-tightening force set by the pressure regulating spring 6, the conical plunger 4 ' falls on the inner wall of the conical plunger hole 3-2 ' again under the action of the pressure regulating spring 6, the oil drainage loop of the pressure regulating valve is closed, and oil drainage is stopped.
When the fuel injector stops injecting, the high-pressure fuel flowing at high speed continues to flow forwards due to the inertia effect, the nozzle of the fuel injector is closed at the moment, the high-pressure fuel flowing forwards continuously is squeezed inside the fuel injector, and a generated pressure echo is transmitted to the pump end along the high-pressure fuel pipe in the reverse direction. The pressure wave reaches the upper part of the buffer valve core 9 through the oil outlet holes 1-3 on the oil outlet valve fastening seat body 1, the buffer valve core 9 moves downwards under the pushing of the pressure wave, and the pressure wave is balanced and disappears at the moment, so that the pressure wave generated when the oil sprayer stops spraying can be eliminated through the buffer valve.
In summary, the outlet valve tight seat with a mechanical pressure regulating valve designed by the invention is designed with a mechanical pressure regulating valve on the outlet valve tight seat of a common rail pump, and the mechanical pressure regulating valve adopts a mechanical open-loop control mode (matched spring pretightening force, throttle valve opening lift, throttle orifice flow coefficient and buffer valve parameters are designed to control the pressure of a common rail system under different rotating speeds and oil injection quantities) to replace a closed-loop control mode which adopts a pressure sensor and an electronic pressure regulating valve to control the rail pressure of the common rail system in the original common rail system, so that a rail pressure closed-loop control module (rail pressure signal identification, electronic regulating valve drive and rail pressure control PID (proportion integration differentiation) model) in an electronic control unit ECU (electronic control unit) of the common rail system is simplified, and a rail pressure sensor, an electronic regulating valve (oil inlet and DRV valve) and a mechanical safety valve on a common rail pipe in the common rail system are also omitted, the cost of the high-pressure common rail system is greatly reduced, and the low-cost application requirement of the low-horsepower diesel high-pressure common rail system is met.
The invention is also provided with a buffer valve above the oil outlet valve, which can balance the pressure wave crest in the process of pressing oil by the plunger and the pressure echo generated when the oil injector stops injecting, thereby improving the pressure fluctuation of the common rail pressure controlled by the mechanical open loop.
The technical solution of the present invention is not limited to the limitations of the above specific embodiments, and all technical modifications made according to the technical solution of the present invention fall within the protection scope of the present invention.
Claims (5)
1. An integrated oil outlet valve tightening seat used on a high-pressure common rail pump comprises an oil outlet valve tightening seat body arranged in the upper end of a plunger sleeve and an oil outlet valve arranged in the oil outlet valve tightening seat body, wherein a plunger hole is formed in the plunger sleeve from top to bottom, a common rail pump plunger is assembled in the plunger hole in a sliding manner, an oil outlet valve mounting cavity is formed in the oil outlet valve tightening seat body, the oil outlet valve is arranged in the oil outlet valve mounting cavity, an inlet of the oil outlet valve is communicated with the plunger hole, an oil outlet hole is formed in the upper end of the oil outlet valve tightening seat body, and an outlet of the oil outlet valve is communicated with; the method is characterized in that: the oil outlet valve is characterized by further comprising a buffer valve arranged above the oil outlet valve and a mechanical pressure regulating valve arranged in the side wall of the oil outlet valve fastening seat body, wherein the buffer valve comprises a buffer valve core, a buffer valve spring and a buffer valve spring gasket, the upper end of the oil outlet valve installation cavity is provided with a buffer valve installation cavity with the aperture smaller than that of the oil outlet valve installation cavity, the buffer valve core is assembled in the buffer valve installation cavity in a sliding mode, the buffer valve core is provided with a lower throttling hole, the lower end of the buffer valve spring is fixed at the upper end of the buffer valve core, the buffer valve spring gasket is fixed at the top end of the buffer valve installation cavity, the center of the buffer valve spring gasket is provided with an upper throttling hole; the oil duct hole of crossing that communicates with mechanical type pressure regulating valve's import is seted up to cushion valve installation cavity one side wall, thereby the cushion valve core plugs up the oil duct hole and only when cushion valve core lower extreme pressure is greater than the pretightning force that the cushion valve spring set for when the cushion valve core moves to cushion valve installation cavity top and makes the cushion valve core not block up the oil duct hole, mechanical type pressure regulating valve's export is connected to the low pressure oil circuit that flows back to the common rail pump through setting up in the oil return way that the tight seat of delivery valve is originally internal.
2. The integrated outlet valve retainer for a high pressure common rail pump according to claim 1, wherein: the mechanical pressure regulating valve comprises a pressure regulating valve mounting seat, a pressure regulating valve seat, a ball valve seat, a pressure regulating spring and a pressure regulating spring gasket, wherein the pressure regulating valve mounting seat is fixed in the side wall of the oil outlet valve fastening seat body; the ball is fixed at the front end of the ball valve seat, the rear end face of the pressure regulating valve seat is provided with a ball sealing conical surface, and the throttling hole of the pressure regulating valve seat is blocked when the ball is tightly attached to the ball sealing conical surface; and a pressure regulating valve low-pressure cavity is arranged between the pressure regulating valve seat and the ball valve seat and is communicated with the oil return channel.
3. The integrated outlet valve retainer for a high pressure common rail pump according to claim 1, wherein: the mechanical pressure regulating valve comprises a pressure regulating valve mounting seat, a pressure regulating valve seat, a conical plunger, a plunger valve seat, a pressure regulating spring and a pressure regulating spring gasket, the pressure regulating valve mounting seat is fixed in the side wall of the oil outlet valve fastening seat body, the pressure regulating valve seat is fixed at the front end of the pressure regulating valve mounting seat, the front end face of the pressure regulating valve seat completely blocks the oil passage hole, the front end face of the pressure regulating valve seat is provided with a conical pressure regulating valve seat orifice communicated with the oil passage hole, the rear end of the conical pressure regulating valve seat orifice is provided with a conical plunger hole, the pressure regulating valve mounting seat is internally provided with a plunger valve seat mounting cavity, the plunger valve seat is assembled in the plunger valve seat mounting cavity, the rear end of the plunger valve seat is fixedly provided with a pressure regulating spring, the rear end of the pressure regulating spring is fixed on a pressure regulating spring gasket, and the pressure regulating; the conical plunger is fixed at the front end of the plunger valve seat, the conical plunger is matched with the conical plunger hole, and the orifice of the conical pressure regulating valve seat is blocked when the conical plunger is tightly attached to the conical plunger hole; and a pressure regulating valve low-pressure cavity is arranged between the plunger valve seat and the pressure regulating valve seat and is communicated with the oil return channel.
4. The integrated outlet valve retainer for a high pressure common rail pump according to claim 1, wherein: the oil outlet valve comprises an oil outlet valve seat fixed at the bottom of an oil outlet valve installation cavity, an oil outlet valve core arranged above the oil outlet valve seat in the oil outlet valve installation cavity, an oil outlet valve spring fixed at the upper end of the oil outlet valve core and an oil outlet valve spring gasket fixed at the top end of the oil outlet valve installation cavity, the upper end of the oil outlet valve spring is fixed at the lower end of the oil outlet valve spring gasket, an oil outlet valve inlet communicated with the plunger hole is formed in the lower end of the oil outlet valve seat, an oil outlet valve sealing surface used for plugging the oil outlet valve core on the oil outlet valve seat is arranged at the upper end of the oil outlet valve seat, an oil outlet valve outlet is formed in the oil.
5. The integrated outlet valve retainer for a high pressure common rail pump according to claim 1, wherein: the buffer valve core is of a U-shaped structure or a convex shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010016240.6A CN113090428A (en) | 2020-01-08 | 2020-01-08 | Integrated oil outlet valve fastening seat for high-pressure common rail pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010016240.6A CN113090428A (en) | 2020-01-08 | 2020-01-08 | Integrated oil outlet valve fastening seat for high-pressure common rail pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113090428A true CN113090428A (en) | 2021-07-09 |
Family
ID=76663222
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010016240.6A Pending CN113090428A (en) | 2020-01-08 | 2020-01-08 | Integrated oil outlet valve fastening seat for high-pressure common rail pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113090428A (en) |
-
2020
- 2020-01-08 CN CN202010016240.6A patent/CN113090428A/en active Pending
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