CN118881493A - Pre-chamber fuel injector and pre-chamber fuel supply system - Google Patents

Abstract

The invention discloses a precombustor oil sprayer and a precombustor oil supply system. Belongs to the technical field of engines, and the precombustor fuel injector comprises: the oil sprayer body and disk seat, the oil sprayer body has leads the oil passageway, and the disk seat is suitable for to install in the one end that leads the oil passageway and be close to the precombustion chamber, and the disk seat has nozzle opening, main oil duct and heat dissipation oil duct, and the one end of nozzle opening is suitable for and leads oil passageway intercommunication through main oil duct and heat dissipation oil duct, the other end of nozzle opening and precombustion chamber intercommunication. According to the pre-combustion chamber fuel injector provided by the embodiment of the invention, the valve seat is provided with the fuel injection hole, the main oil duct and the heat dissipation oil duct, when fuel flows to the fuel injection hole through the main oil duct and the heat dissipation oil duct, the heat exchange area of the fuel and the valve seat is large, and the fuel can sufficiently cool the valve seat through the main oil duct and the heat dissipation oil duct so as to reduce the temperature of the valve seat, improve the problem of carbon deposition of the valve seat and reduce the risk of blockage of the fuel injection hole.

Description

Pre-chamber fuel injector and pre-chamber fuel supply system

Technical Field

The invention relates to the technical field of engines, in particular to a precombustor oil sprayer and a precombustor oil supply system.

Background

In the related art, the prechamber technology can greatly improve the thermal efficiency of the engine, however, residual carbon and impurities which are not completely combusted in the prechamber are easy to deposit on the valve seat of the fuel injector, and because the fuel flow required by the fuel injector in the prechamber is very small, the aperture of the fuel injection hole on the valve seat is very small, and the problem that the fuel injection hole is blocked by carbon deposition frequently occurs.

Disclosure of Invention

The present invention aims to solve, at least to some extent, one of the above technical problems in the prior art. Therefore, the invention provides the precombustor oil sprayer, which can reduce the risk of blocking an oil spraying hole.

The invention also provides a precombustor oil supply system with the precombustor oil sprayer.

According to an embodiment of the invention, a prechamber fuel injector comprises: the main body of the oil sprayer, the oil sprayer body is provided with an oil guide channel; the valve seat is suitable for being installed one end of the oil guide channel, which is close to the precombustion chamber, the valve seat is provided with an oil injection hole, a main oil duct and a heat dissipation oil duct, one end of the oil injection hole is communicated with the oil guide channel through the main oil duct and the heat dissipation oil duct, and the other end of the oil injection hole is suitable for being communicated with the precombustion chamber.

According to the pre-combustion chamber fuel injector provided by the embodiment of the invention, the valve seat is provided with the fuel injection hole, the main oil duct and the heat dissipation oil duct, when fuel flows to the fuel injection hole through the main oil duct and the heat dissipation oil duct, the heat exchange area of the fuel and the valve seat is large, and the fuel can sufficiently cool the valve seat through the main oil duct and the heat dissipation oil duct so as to reduce the temperature of the valve seat, improve the problem of carbon deposition of the valve seat and reduce the risk of blockage of the fuel injection hole.

According to some embodiments of the invention, the axis of the main oil gallery coincides with the axis of the valve seat, and the main oil gallery and the oil jet are disposed opposite to each other and are directly communicated.

According to some embodiments of the invention, the heat dissipation oil passage is disposed radially outside the main oil passage, and the heat dissipation oil passage communicates with the oil jet hole through the main oil passage.

According to some embodiments of the invention, the valve seat comprises: the oil injection part is in interference fit with the inner wall of the oil guide channel and is provided with the oil injection hole; the oil guide device comprises a base body, wherein the base body is connected with the oil injection part, the base body is in clearance fit with the inner wall of the oil guide channel to form an oil guide space, the base body is provided with a main oil duct and a heat dissipation oil duct, one end of the heat dissipation oil duct is communicated with the oil guide space, and the other end of the heat dissipation oil duct is communicated with the main oil duct.

According to some embodiments of the invention, the number of the heat dissipation oil channels is plural, and the plurality of the heat dissipation oil channels are arranged radially with respect to the main oil channel.

According to some embodiments of the invention, the injection hole has an injection section towards the prechamber, the bore diameter of the injection section increasing gradually in the direction of the injection hole approaching the prechamber.

According to some embodiments of the invention, the prechamber fuel injector further comprises: at least one heat conduction sealing ring, heat conduction sealing ring cover is located the outside of sprayer body, in the radial direction of disk seat, at least one heat conduction sealing ring with the oil guide space corresponds.

According to some embodiments of the invention, the prechamber fuel injector further comprises: and the valve core is at least partially arranged in the main oil duct and is used for opening and closing the oil injection hole.

According to another aspect of the present invention, a prechamber oil supply system comprises: the pre-combustion chamber oil sprayer is the pre-combustion chamber oil sprayer, the pre-combustion chamber oil delivery pipe and the cooler, the pre-combustion chamber oil delivery pipe with lead oily passageway intercommunication, the cooler with the pre-combustion chamber oil delivery pipe heat conduction is connected.

According to the oil supply system of the precombustor, the cooler can cool the fuel oil in the oil delivery pipe of the precombustor, the valve seat is provided with the fuel injection hole, the main oil duct and the heat dissipation oil duct, and the cooled fuel oil can sufficiently cool the valve seat through the main oil duct and the heat dissipation oil duct, so that the temperature of the valve seat is reduced, the problem of carbon deposition of the valve seat is solved, and the risk of blockage of the fuel injection hole is reduced.

According to some embodiments of the invention, the prechamber oil supply system further comprises: and the precombustor pressurizing oil pump is communicated with an inlet of the precombustor oil delivery pipe.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

FIG. 1 is a schematic illustration of a prechamber fuel injector according to an embodiment of the invention;

FIG. 2 is a schematic diagram of an oil supply system according to an embodiment of the present invention.

Reference numerals:

A fuel injector body 1; an oil guide passage 11;

A valve seat 2; an oil injection portion 21; an oil jet hole 211; a fuel injection section 2111; a seat portion 22; main oil gallery 221; a heat radiation oil passage 222; an oil guiding space 23;

A heat-conducting sealing ring 3; a valve core 4;

a prechamber fuel injector 10; a prechamber oil delivery line 20; a cooler 30; a precombustor pressurized oil pump 40; a thermostat 50; a prechamber fuel temperature sensor 60; a cylinder pressure sensor 70; a prechamber fuel pressure sensor 80; a prechamber oil rail 90;

a prechamber oil supply system 100;

A main combustion chamber oil supply system 200; a main combustion chamber pressurizing oil pump 201; a main combustion chamber oil delivery pipe 202; a main combustion chamber oil rail 203; a main combustion chamber fuel injector 204, a main combustion chamber fuel pressure sensor 205;

A precombustion chamber 300; a main combustion chamber 400; low pressure oil line 500.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "inner", "outer", etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may communicate with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

The prechamber fuel injector 10 and the prechamber fuel delivery system 100 according to embodiments of the present invention are described in detail below with reference to the accompanying drawings.

Referring to FIG. 1, a prechamber fuel injector 10 includes: the fuel injector comprises a fuel injector body 1 and a valve seat 2, wherein the fuel injector body 1 is provided with a fuel guide channel 11, the valve seat 2 is suitable for being arranged at one end of the fuel guide channel 11, which is close to a precombustion chamber 300, the valve seat 2 is provided with a fuel injection hole 211, a main oil duct 221 and a heat dissipation oil duct 222, one end of the fuel injection hole 211 is communicated with the fuel guide channel 11 through the main oil duct 221 and the heat dissipation oil duct 222, and the other end of the fuel injection hole 211 is suitable for being communicated with the precombustion chamber 300.

Wherein the prechamber fuel injector 10 can be used to spray fuel to the prechamber 300 of the engine to provide fuel to the prechamber 300 for combustion, the injector body 1 of the prechamber fuel injector 10 can be constructed as a tubular structure, the injector body 1 can be mounted in the cylinder head of the engine, the injector body 1 has a fuel guiding channel 11 for guiding the flow of fuel.

The valve seat 2 of the prechamber injector 10 is installed at one end of the oil guide passage 11 near the prechamber 300, the valve seat 2 is provided with an oil injection hole 211, a main oil passage 221 and a heat dissipation oil passage 222, and the main oil passage 221 and the heat dissipation oil passage 222 can be used for communicating the oil injection hole 211 and the oil guide passage 11, that is, the fuel in the oil guide passage 11 can flow to the oil injection hole 211 through the main oil passage 221 and the heat dissipation oil passage 222 and then be injected to the prechamber 300 through the oil injection hole 211, the temperature of the valve seat 2 is higher at one side near the prechamber 300 due to the ignition of the fuel in the prechamber 300, and the temperature of the fuel which is not ignited is lower when the fuel flows through the main oil passage 221 and the heat dissipation oil passage 222 can exchange heat with the valve seat 2 so as to reduce the temperature of the valve seat 2.

It can be appreciated that, compared with the scheme that only the main oil duct 221 is arranged on the valve seat 2, the embodiment of the invention can increase the heat exchange area between the fuel and the valve seat 2 when the fuel flows through the valve seat 2 by additionally arranging the heat dissipation oil duct 222 on the valve seat 2, so that the fuel takes away more heat when the fuel flows through the valve seat 2, thereby being beneficial to improving the heat dissipation effect of the valve seat 2, reducing the carbon deposition amount of the valve seat 2 and reducing the risk of blocking the oil injection hole 211 by carbon deposition.

In the above embodiment, the valve seat 2 has the oil injection hole 211, the main oil passage 221 and the heat dissipation oil passage 222, and when the fuel flows to the oil injection hole 211 through the main oil passage 221 and the heat dissipation oil passage 222, the heat exchange area between the fuel and the valve seat 2 is large, and the fuel can sufficiently cool the valve seat 2 through the main oil passage 221 and the heat dissipation oil passage 222, so as to reduce the temperature of the valve seat 2, improve the problem of carbon deposition of the valve seat 2, and reduce the risk of blockage of the oil injection hole 211.

In some embodiments of the present invention, referring to fig. 1, the axis of main oil gallery 221 coincides with the axis of valve seat 2, and main oil gallery 221 and oil jet 211 are disposed opposite to and in direct communication with each other.

Wherein, the axis of disk seat 2 can coincide with the axis of oil duct 11, and main oil duct 221 and nozzle opening 211 all can follow disk seat 2's axis extension, and main oil duct 221 and nozzle opening 211 are relative to setting up, and main oil duct 221 and nozzle opening 211 direct communication.

In the above embodiment, the axis of the main oil passage 221 coincides with the axis of the valve seat 2, the main oil passage 221 and the oil injection hole 211 are disposed opposite to each other and are directly communicated, and the flow direction of the fuel in the fuel guide passage 11 may not be changed when the fuel flows to the oil injection hole 211 through the main oil passage 221, so as to ensure smooth injection of the pre-chamber fuel injector 10.

In some embodiments of the present invention, referring to fig. 1, a heat dissipation oil passage 222 is provided radially outside a main oil passage 221, and the heat dissipation oil passage 222 communicates with the oil jet hole 211 through the main oil passage 221.

The heat dissipation oil duct 222 is disposed on the radial outer side of the main oil duct 221, the heat dissipation oil duct 222 may be disposed obliquely with respect to the main oil duct 221, the heat dissipation oil duct 222 may also be disposed spirally around the main oil duct 221 with respect to the main oil duct 221, the heat dissipation oil duct 222 is communicated with the oil spray hole 211 through the main oil duct 221, one path of fuel in the fuel guide channel 11 may flow to the oil spray hole 211 through the main oil duct 221, and the other path may enter the main oil duct 221 through the heat dissipation oil duct 222 and then flow to the oil spray hole 211.

In the above embodiment, the heat dissipation oil passage 222 arranged on the radial outer side of the main oil passage 221 can increase the heat exchange area of the fuel and the valve seat 2, reduce the temperature of the valve seat 2 at the heat dissipation oil passage 222, and simultaneously, because the main oil passage 221 is opposite to the fuel injection hole 211 and is directly communicated with the fuel injection hole 211, the heat dissipation oil passage 222 is indirectly communicated with the fuel injection hole 211 through the main oil passage 221, the fuel flow rate in the main oil passage 221 is greater than the fuel flow rate in the heat dissipation oil passage 222, the fuel with a slower flow rate in the heat dissipation oil passage 222 can have a longer heat exchange time with the inner wall of the heat dissipation oil passage 222 so as to increase the cooling effect of the fuel on the valve seat 2 at the heat dissipation oil passage 222, in addition, the higher fuel flow rate in the main oil passage 221 can form negative pressure at the communication position of the heat dissipation oil passage 222 and the main oil passage 221, so as to form an injection effect, and the fuel remained in the heat dissipation oil passage 222 can be sucked out when injecting fuel into the precombustion chamber 300 each time, so as to avoid the fuel staying in the heat dissipation oil passage 222 for a long time, and the generation of glue deposited at the heat dissipation oil passage 222 and the fuel injection hole 211 under high temperature environment.

In some embodiments of the present invention, as shown with reference to fig. 1, the valve seat 2 includes: the oil injection part 21 and the base body 22, the oil injection part 21 is in interference fit with the inner wall of the oil guide channel 11, the oil injection part 21 is provided with an oil injection hole 211, the base body 22 is connected with the oil injection part 21, the base body 22 is in clearance fit with the inner wall of the oil guide channel 11 to form an oil guide space 23, the base body 22 is provided with a main oil duct 221 and a heat dissipation oil duct 222, one end of the heat dissipation oil duct 222 is communicated with the oil guide space 23, and the other end of the heat dissipation oil duct 222 is communicated with the main oil duct 221.

Wherein, the oil injection portion 21 is connected with one end of the base portion 22 facing the precombustion chamber 300, the oil injection portion 21 and the base portion 22 may be of a stepped shaft structure, the outer diameter of the oil injection portion 21 is larger than the inner diameter of the oil guiding channel 11, the outer diameter of the base portion 22 is smaller than the inner diameter of the oil guiding channel 11, that is, the oil injection portion 21 and the inner wall of the oil guiding channel 11 are in interference fit to form a sealing effect, and the base portion 22 and the inner wall of the oil guiding channel 11 are in clearance fit to form an oil guiding space 23.

In the above embodiment, the seat portion 22 is in clearance fit with the inner wall of the oil guide channel 11 to form the oil guide space 23, one end of the heat dissipation oil duct 222 is communicated with the oil guide space 23, and the other end of the heat dissipation oil duct 222 is communicated with the main oil duct 221, so that when fuel flows to the heat dissipation oil duct 222 through the oil guide space 23, the fuel can exchange heat with the outer side wall of the seat portion 22 in the oil guide space 23, thereby being beneficial to further improving the heat exchange area of the fuel and the valve seat 2 and improving the cooling effect of the fuel on the valve seat 2.

In some embodiments of the present invention, referring to fig. 1, the number of the heat dissipation oil passages 222 is plural, and the plurality of heat dissipation oil passages 222 are arranged radially with respect to the main oil passage 221.

Each of the heat dissipation oil channels 222 extends in the radial direction of the valve seat 2 with the main oil channel 221 as a center, and an included angle between any two adjacent heat dissipation oil channels 222 may be equal, so as to realize that the plurality of heat dissipation oil channels 222 are uniformly arranged in a radial shape relative to the main oil channel 221, and the oil guiding space 23 may be an annular space, and the oil guiding space 23 is communicated with the main oil channel 221 through the plurality of heat dissipation oil channels 222.

In the above embodiment, the plurality of heat dissipation oil passages 222 are radially arranged relative to the main oil passage 221, so that the plurality of heat dissipation oil passages 222 can efficiently and uniformly cool and dissipate heat to the valve seat 2, so as to improve the cooling effect of the oil on the valve seat 2. In addition, the plurality of heat dissipation oil passages 222 are arranged radially with respect to the main oil passage 221, which is convenient for machining, so as to reduce the machining difficulty of the valve seat 2.

In some embodiments of the present invention, referring to FIG. 1, the fuel injector 211 has a fuel injection section 2111 facing the prechamber 300, and the bore diameter of the fuel injection section 2111 gradually increases in the direction of the fuel injector 211 approaching the prechamber 300.

The oil spraying section 2111 may be a bell mouth structure with gradually increased aperture, and compared with a cylindrical nozzle with unchanged aperture, the oil spraying section 2111 with the bell mouth structure has better self-cleaning capability during oil spraying, and carbon deposition residue at the edge of the oil spraying section 2111 can be removed during oil spraying through the oil spraying hole 211.

In the above embodiment, in the direction that the oil injection hole 211 approaches the prechamber 300, the aperture of the oil injection section 2111 is gradually increased to improve the self-cleaning ability of the oil injection section 2111, avoid carbon deposition residue formed at the edge of the oil injection section 2111, and reduce the risk of clogging of the oil injection hole 211.

In some embodiments of the present invention, referring to FIG. 1, prechamber fuel injector 10 further comprises: at least one heat conduction sealing ring 3, the outside of sprayer body 1 is located to heat conduction sealing ring 3 cover, and in the radial direction of disk seat 2, at least one heat conduction sealing ring 3 corresponds with the oil space 23.

Wherein, heat conduction sealing ring 3 can be materials such as teflon, and heat conduction sealing ring 3 has sealed and heat conduction's function, and the outside of sprayer body 1 is located to heat conduction sealing ring 3 cover, and heat conduction sealing ring 3 can seal the gap between sprayer body 1 and the cylinder head to avoid prechamber 300 to take place to leak, simultaneously, heat conduction sealing ring 3 can outwards transmit the heat of sprayer body 1 to the cylinder head, in order to reduce the temperature of prechamber sprayer 10.

The number of the heat conducting sealing rings 3 may be plural to enhance sealing and heat conducting effects, and in the radial direction of the valve seat 2, at least one heat conducting sealing ring 3 corresponds to the oil conducting space 23, so that heat on the valve seat 2 can be transferred to the heat conducting sealing ring 3 through a shorter heat transfer path, for example, the heat transfer path is: the fuel injector comprises a fuel injection part 21, a fuel injector body 1, a heat conduction sealing ring 3, fuel in the fuel injection part 21, a seat body 22 and a fuel conduction space 23, the fuel injector body 1 and the heat conduction sealing ring 3.

In the above embodiment, at least one heat conducting sealing ring 3 corresponds to the oil conducting space 23 in the radial direction of the valve seat 2, so as to shorten the heat transfer path from the valve seat 2 to the heat conducting sealing ring 3, thereby being beneficial to improving the heat dissipation effect of the valve seat 2, reducing the temperature of the valve seat 2 and reducing the carbon deposition of the valve seat 2.

In some embodiments of the present invention, referring to FIG. 1, prechamber fuel injector 10 further comprises: and a spool 4, the spool 4 being at least partially disposed in the main oil gallery 221, the spool 4 being configured to open and close the oil jet hole 211.

The valve element 4 may move relative to the valve seat 2, the valve element 4 may be a spherical valve element, the valve element 4 may move along an extending direction of the main oil duct 221, the valve element 4 is at least partially disposed in the main oil duct 221, so as to prevent the valve element 4 from falling out of the main oil duct 221, the valve element 4 may move in a direction away from the oil injection hole 211 to open the oil injection hole 211, and the valve element 4 may also move in a direction close to the oil injection hole 211 to close the oil injection hole 211.

In the above embodiment, the valve element 4 is at least partially disposed in the main oil duct 221, the valve element 4 can realize opening and closing of the oil injection hole 211, when the oil injection hole 211 is opened, the oil injection hole 211 injects oil into the precombustor 300, when the oil injection hole 211 is closed, the fuel oil in the precombustor 300 is ignited, and the valve element 4 can prevent the combustion gas in the precombustor 300 from entering the precombustor injector 10 through the oil injection hole 211.

Referring to fig. 1 and 2, a prechamber oil supply system 100 according to another aspect of the present invention includes: the prechamber fuel injector 10 is the prechamber fuel injector 10 of the above embodiment, the prechamber fuel delivery pipe 20 is communicated with the fuel guide channel 11, and the cooler 30 is in heat conduction connection with the prechamber fuel delivery pipe 20.

The prechamber oil delivery pipe 20 is communicated with the oil guide channel 11, the prechamber oil delivery pipe 20 can input fuel into the oil guide channel 11, the cooler 30 is in heat conduction connection with the prechamber oil delivery pipe 20, the cooler 30 and the prechamber oil delivery pipe 20 can be arranged in a split mode, the cooler 30 can be integrated in the prechamber oil delivery pipe 20, the cooler 30 can cool the fuel in the prechamber oil delivery pipe 20 so as to reduce the temperature of the fuel entering the prechamber oil injector 10, and the cooling effect of the fuel on the valve seat 2 is improved.

In the above embodiment, the cooler 30 may cool the fuel in the oil delivery pipe 20 of the precombustion chamber, the valve seat 2 has the fuel injection hole 211, the main oil duct 221 and the heat dissipation oil duct 222, and the cooled fuel may sufficiently cool the valve seat 2 through the main oil duct 221 and the heat dissipation oil duct 222, so as to reduce the temperature of the valve seat 2, improve the problem of carbon deposition of the valve seat 2, and reduce the risk of blockage of the fuel injection hole 211.

In some embodiments of the present invention, referring to fig. 2, the prechamber oil supply system 100 further comprises: the precombustor pressurizing oil pump 40, the precombustor pressurizing oil pump 40 communicates with the inlet of the precombustor oil delivery pipe 20.

The fuel tank of the vehicle can pump fuel to the precombustor pressurizing oil pump 40 through the low-pressure oil pipe 500, and the precombustor pressurizing oil pump 40 can continuously pressurize the fuel and then deliver the fuel to the inlet of the precombustor oil delivery pipe 20, so as to increase the pressure of the fuel flowing from the precombustor oil delivery pipe 20 to the precombustor oil injector 10.

In the above embodiment, the pre-chamber pressurizing oil pump 40 is communicated with the inlet of the pre-chamber oil delivery pipe 20, and when the pre-chamber injector 10 is operating normally, the pre-chamber pressurizing oil pump 40 can raise the pressure of the fuel to a first preset pressure threshold value, so as to facilitate the full combustion of the fuel in the pre-chamber 300 and reduce the carbon deposition, and when the fuel injection hole 211 is blocked, the pre-chamber pressurizing oil pump 40 can raise the pressure of the fuel to a second preset pressure threshold value, which is greater than the first preset pressure threshold value, so as to remove the carbon deposition blocking the fuel injection hole 211 through the high-pressure fuel, wherein the first preset pressure threshold value may be 100bar, and the second preset pressure threshold value may be 500bar.

In some embodiments of the present invention, referring to fig. 2, the prechamber oil supply system 100 further comprises: a thermostat 50 and a prechamber fuel temperature sensor 60, the prechamber fuel temperature sensor 60 being configured to detect a temperature of fuel entering the prechamber fuel injector 10, the thermostat 50 being configured to control a cooling power of the cooler 30 in response to the temperature of fuel so that the temperature of fuel entering the prechamber fuel injector 10 is maintained within a predetermined fuel temperature range. Wherein the thermostat 50 can control the cooling power of the cooler 30 by adjusting the flow of the cooling liquid into the cooler 30.

In some embodiments of the present invention, referring to fig. 2, the prechamber oil supply system 100 further comprises: a cylinder pressure sensor 70 and a controller (ECU), the cylinder pressure sensor 70 may be provided in the main combustion chamber 400, the cylinder pressure sensor 70 being configured to detect a pressure in the main combustion chamber 400, and the controller being configured to control the pre-chamber pressurized oil pump 40 to raise a pressure of the fuel from a first preset pressure threshold to a second preset pressure threshold when a cylinder pressure signal is determined to be abnormal based on the pressure in the main combustion chamber 400.

For example, in a normal case, the working pressure of the prechamber fuel supply system 100 is 100bar, when the prechamber 300 is not burned normally due to the blockage of the fuel injection hole 211, the controller receives an abnormal cylinder pressure signal, and sends out a control signal, the prechamber pressurized fuel pump 40 is controlled to raise the fuel pressure to 500bar, and the prechamber fuel injector 10 is operated to inject fuel under higher fuel pressure, so as to achieve the purpose of cleaning the fuel injection hole 211, achieve self-cleaning, and control the prechamber fuel supply system 100 to restore to the working pressure of 100bar until the cylinder pressure signal is restored to be normal.

In some embodiments of the present invention, referring to fig. 2, the prechamber oil supply system 100 further comprises: the pre-chamber fuel pressure sensor 80, the controller can obtain the pressure of the fuel entering the pre-chamber fuel injector 10 through the pre-chamber fuel pressure sensor 80, so as to accurately regulate and control the power of the pre-chamber pressurized fuel pump 40.

In some embodiments of the present invention, referring to fig. 2, the prechamber oil supply system 100 further comprises: the prechamber oil rail 90, the prechamber oil delivery pipe 20 communicates with the oil guide passage 11 through the prechamber oil rail 90, and the prechamber fuel temperature sensor 60 and the prechamber fuel pressure sensor 80 may be mounted to the prechamber oil rail 90.

In some embodiments of the present invention, after the low-pressure fuel is pressurized by the prechamber pressurizing oil pump 40, the pressure is raised to the target rail pressure, and along with the rise of the pressure, the fuel temperature is raised to a certain extent, the high-pressure fuel temperature is detected by the prechamber fuel temperature sensor 60 arranged on the prechamber fuel rail 90 and fed back to the controller, and the controller sends a control signal to the electrically controlled thermostat 50 to control the flow rate of cooling liquid flowing through the cooler 30, finally, the fuel temperature in the prechamber fuel injector 10 is controlled in a proper range, the capability of the fuel cooling valve seat 2 is raised, and the problem of carbon deposition of the prechamber fuel injector 10 is improved.

An oil supply system according to an embodiment of the present invention includes the main combustion chamber oil supply system 200 and the prechamber oil supply system 100 of the above-described embodiment, the main combustion chamber oil supply system 200 including: the main combustion chamber pressurizing oil pump 201, the main combustion chamber oil delivery pipe 202, the main combustion chamber oil rail 203 and the main combustion chamber oil sprayer 204 are sequentially connected, wherein the main combustion chamber oil rail 203 is provided with a main combustion chamber oil pressure sensor 205, the main combustion chamber pressurizing oil pump 201 is communicated with an oil tank through a low pressure oil pipe 500, and oil is pressurized by the main combustion chamber pressurizing oil pump 201 and sequentially sprayed into the main combustion chamber 400 after passing through the main combustion chamber oil delivery pipe 202, the main combustion chamber oil rail 203 and the main combustion chamber oil sprayer 204.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Further, one skilled in the art can engage and combine the different embodiments or examples described in this specification.

While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims (10)

1. A prechamber fuel injector, comprising:

A fuel injector body (1), wherein the fuel injector body (1) is provided with a fuel guide channel (11);

The valve seat (2), valve seat (2) are suitable for to install the one end that is close to prechamber (300) in oil guide passageway (11), valve seat (2) have nozzle opening (211), main oil duct (221) and heat dissipation oil duct (222), the one end of nozzle opening (211) is passed through main oil duct (221) with heat dissipation oil duct (222) with oil guide passageway (11) intercommunication, the other end of nozzle opening (211) be suitable for with prechamber (300) intercommunication.

2. The prechamber injector according to claim 1, characterized in that the axis of the main oil gallery (221) coincides with the axis of the valve seat (2), the main oil gallery (221) and the injection hole (211) being arranged opposite and in direct communication.

3. The prechamber injector according to claim 2, characterized in that the heat dissipation oil duct (222) is arranged radially outside the main oil duct (221), which heat dissipation oil duct (222) communicates with the injection hole (211) via the main oil duct (221).

4. A prechamber fuel injector according to claim 3, characterized in that the valve seat (2) comprises:

An oil injection part (21), wherein the oil injection part (21) is in interference fit with the inner wall of the oil guide channel (11), and the oil injection part (21) is provided with the oil injection hole (211);

The oil guide device comprises a base body (22), wherein the base body (22) is connected with the oil injection part (21), the base body (22) is in clearance fit with the inner wall of the oil guide channel (11) to form an oil guide space (23), the base body (22) is provided with a main oil duct (221) and a heat dissipation oil duct (222), one end of the heat dissipation oil duct (222) is communicated with the oil guide space (23), and the other end of the heat dissipation oil duct (222) is communicated with the main oil duct (221).

5. The prechamber fuel injector according to claim 4, characterized in that the number of the heat dissipation oil channels (222) is a plurality, and that the plurality of heat dissipation oil channels (222) are arranged radially with respect to the main oil channel (221).

6. The prechamber fuel injector according to claim 1, characterized in that the fuel injection hole (211) has a fuel injection section (2111) facing the prechamber (300), the bore diameter of the fuel injection section (2111) increasing gradually in the direction of the fuel injection hole (211) approaching the prechamber (300).

7. The prechamber fuel injector of claim 1, further comprising: at least one heat conduction sealing ring (3), heat conduction sealing ring (3) cover is located the outside of sprayer body (1), in the radial direction of disk seat (2), at least one heat conduction sealing ring (3) with lead oily space (23) correspondence.

8. The prechamber fuel injector according to any one of claims 1-7, further comprising: and the valve core (4) is at least partially arranged in the main oil duct (221), and the valve core (4) is used for opening and closing the oil injection hole (211).

9. A prechamber oil supply system (100), characterized by comprising:

The fuel injector of the precombustion chamber, the prechamber injector being according to any one of claims 1-8;

a precombustor oil delivery pipe (20), wherein the precombustor oil delivery pipe (20) is communicated with the oil guide channel (11);

and the cooler (30) is in heat conduction connection with the precombustor oil delivery pipe (20).

10. The prechamber oil supply system (100) according to claim 9, further comprising: and the precombustor pressurizing oil pump (40), wherein the precombustor pressurizing oil pump (40) is communicated with an inlet of the precombustor oil delivery pipe (20).