CN217632665U

CN217632665U - Active precombustion chamber type engine ignition device

Info

Publication number: CN217632665U
Application number: CN202221739974.8U
Authority: CN
Inventors: 覃壮革; 沈捷; 卢一乐; 廖升友; 左俊杰
Original assignee: Guangxi Yuchai Machinery Co Ltd
Current assignee: Guangxi Yuchai Machinery Co Ltd
Priority date: 2022-07-07
Filing date: 2022-07-07
Publication date: 2022-10-21
Anticipated expiration: 2032-07-07

Abstract

The utility model discloses an initiative precombustion chamber formula engine ignition, include: the pre-combustion chamber assembly is arranged in the cylinder cover, and the active pre-combustion chamber is arranged at the lower part of the pre-combustion chamber assembly; the injection port of the active precombustion chamber is arranged between an intake valve and an exhaust valve of the cylinder cover and faces the combustion chamber; the spark plug is arranged in the pre-combustion chamber component, and the ignition part of the spark plug is exposed in the active pre-combustion chamber; the air inlet connecting pipe is arranged in the cylinder cover, and one end of the air inlet connecting pipe is communicated with an air inlet of the active precombustion chamber; the gas outlet of the metering valve is communicated with the other end of the gas inlet connecting pipe, and the gas inlet of the metering valve is communicated with a combustible gas supply pipeline; the gas nozzle is arranged on the cylinder cover, is communicated with the combustible gas supply pipeline and is used for spraying combustible gas to the combustion chamber; the intake pipe communicates with an intake valve provided in the cylinder head, and the intake pipe is configured to supply air to the combustion chamber through the intake valve. Lean combustion can be achieved with lower ignition energy.

Description

Active precombustion chamber type engine ignition device

Technical Field

The utility model relates to an engine manufacturing field especially relates to an initiative prechamber formula engine ignition.

Background

The existing ignition type piston engine is generally that a mixer is added to an air inlet main pipe, fuel gas is injected in a single point mode, fuel gas and fresh air are mixed and then are respectively sent into each cylinder, and the mixed combustible gas is ignited by a spark near a compression end point.

The ignition modes of the engine in the prior art are mainly divided into: one is to use a spark plug, as shown in fig. 1; secondly, a precombustion chamber is adopted, as shown in figure 2; both of which can achieve spark ignition. However, the current ignition mode of the pre-combustion chamber type is basically a passive type, namely, combustible mixture of the pre-combustion chamber is poured from the cylinder.

The prior art ignition mode of the engine has the following defects:

the direct ignition mode of the spark plug requires higher ignition energy, has strict requirements on the reliability and durability of the spark plug, and is unstable in combustion and flame propagation, so that fire easily occurs. In addition, structurally, in order to secure a compression ratio, it is necessary to increase the volume of a combustion chamber compared to a diesel engine, and therefore, either a natural gas engine-dedicated cylinder head with a complicated structure and a partial combustion chamber is designed or the volume of a piston is increased as much as possible based on the diesel engine structure, which affects the reliability of the piston.

Passive form antechamber ignition mode still the intake pipe single-point admits air, and is high to mixed gas concentration requirement, can not too thin, otherwise catch fire easily, nevertheless intake stroke, the valve is opened early, last exhaust stroke final stage, high temperature high pressure gas in the jar in addition, high concentration gas mixture causes the intake pipe tempering again easily in the intake pipe, has the potential safety hazard.

The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information constitutes prior art already known to a person skilled in the art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an initiative prechamber formula engine ignition, it can realize quick, stable thin gas mixture burning with lower ignition energy, has stopped the intake pipe tempering trouble moreover.

In order to achieve the purpose, the utility model provides an active pre-combustion chamber type engine ignition device, which comprises a pre-combustion chamber component, a spark plug, an air inlet connecting pipe, a metering valve, a gas nozzle and an air inlet pipe; the precombustion chamber assembly is arranged in the cylinder cover and comprises an active precombustion chamber which is arranged at the lower part of the precombustion chamber assembly, and an injection port of the active precombustion chamber is arranged between an intake valve and an exhaust valve of the cylinder cover and faces the combustion chamber; the spark plug is arranged in the precombustion chamber component, and the ignition part of the spark plug is exposed in the active precombustion chamber; the air inlet connecting pipe is arranged in the cylinder cover, and one end of the air inlet connecting pipe is communicated with an air inlet of the active precombustion chamber; the gas outlet of the metering valve is communicated with the other end of the gas inlet connecting pipe, and the gas inlet of the metering valve is communicated with a combustible gas supply pipeline; the gas nozzle is arranged on the cylinder cover, is communicated with the combustible gas supply pipeline and is used for spraying combustible gas to the combustion chamber; the intake pipe communicates with an intake valve provided in the cylinder head, and the intake pipe is configured to supply air to the combustion chamber through the intake valve.

In a preferred embodiment, the ignition device of the active prechamber engine further comprises a check valve arranged between the other end of the air inlet connecting pipe and the air outlet of the metering valve, and the check valve is used for controlling the combustible gas to flow to the active prechamber only through the metering valve.

In a preferred embodiment, the metering valve, the non-return valve and the inlet connection form an inlet branch.

In a preferred embodiment, the ignition device of the active prechamber type engine further comprises a controller, which can acquire the phase relation between a crankshaft and a camshaft, and control the opening and closing time of an intake valve and an exhaust valve through the camshaft, so as to control the combustible gas amount entering the active prechamber through a metering valve.

In a preferred embodiment, the controller is further capable of controlling the fuel injection timing, the injection amount of the fuel gas from the fuel gas injection nozzle, and the ignition timing of the ignition plug by acquiring the phase relationship of the crankshaft and the camshaft and controlling the opening and closing timings of the intake valve and the exhaust valve by the camshaft.

Compared with the prior art, the utility model discloses an initiative prechamber formula engine ignition has following beneficial effect: the cylinder cover is internally provided with the precombustion chamber assembly, wherein the active precombustion chamber is arranged, the spark plug is arranged in the precombustion chamber, and the gas supply branch consisting of the metering valve, the one-way valve and the gas inlet connecting pipe supplies combustible gas to the active precombustion chamber, so that the combustible gas in the precombustion chamber is in an active gas supply form, and the one-way valve can ensure that the combustible gas cannot flow backwards from the precombustion chamber; meanwhile, the phase relation of a crankshaft and a camshaft is collected through a controller, and the phase relation is matched with the camshaft to control an intake valve and an exhaust valve, so that the combustible gas injection time and the combustible gas injection quantity of a precombustion chamber and a nozzle and the ignition time of a spark plug are controlled. Therefore, the quick and stable lean mixture combustion can be realized by using lower ignition energy, and the backfire fault of the air inlet pipe is avoided.

Drawings

FIG. 1 is a schematic diagram of an ignition device for a spark plug ignition according to one embodiment of the prior art;

FIG. 2 is a schematic diagram of a passive prechamber ignition device according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of an ignition device of an active prechamber engine according to an embodiment of the present invention.

Description of the main reference numerals:

101-active prechamber, 102-spark plug, 103-air inlet connecting pipe, 104-one-way valve, 105-metering valve, 106-controller, 107-gas nozzle, 10-cylinder body, 20-cylinder cover, 30-piston, 40-inlet valve, 50-outlet valve and 60-inlet pipe.

Detailed Description

The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited by the following detailed description.

Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.

As shown in fig. 3, an ignition device of an active prechamber engine according to a preferred embodiment of the present invention includes a prechamber assembly, a spark plug 102, an intake connecting pipe 103, a metering valve 104, a gas nozzle 107, and an intake pipe 60. A prechamber assembly is arranged inside cylinder head 20, which prechamber assembly comprises an active prechamber 101 arranged in the lower part of the prechamber assembly, the injection openings of active prechamber 101 being arranged between inlet valve 40 and exhaust valve 50 of cylinder head 20 and facing the combustion chamber. The spark plug 102 is disposed within the pre-chamber assembly and the sparking portion of the spark plug 102 is exposed within the active pre-chamber 101. An intake connecting pipe 103 is provided in the cylinder head 20, and one end of the intake connecting pipe 103 communicates with an intake port of the active prechamber 101. An air outlet of the metering valve 104 is communicated with the other end of the air inlet connecting pipe 103, and an air inlet of the metering valve 104 is communicated with a combustible gas supply pipeline. A gas nozzle 107 is provided on the cylinder head 20, the gas nozzle 107 communicates with a fuel gas supply line, and the gas nozzle 107 is configured to inject a combustible gas into the combustion chamber. The intake pipe 60 communicates with the intake valves 40 provided in the cylinder head 20, the intake pipe 60 serving to supply air to the combustion chamber through the intake valves 40, and the combustible gas introduced from the gas nozzle 107 and the air introduced from the intake valves 40 are sufficiently mixed to form a combustible mixture in the combustion chamber at the top of the piston 30 in the cylinder bore of the cylinder block 10.

In some embodiments, the active prechamber engine ignition device further comprises a check valve 104 disposed between the other end of the air intake connecting pipe 103 and the air outlet of the metering valve 104, and the check valve 104 is used to control the combustible gas to flow from the metering valve 104 to the active prechamber 101 only. Wherein the metering valve 104, the one-way valve 104 and the air inlet connecting pipe 103 form an air supply branch. The gas supply branch is communicated with a combustible gas supply pipeline.

In some embodiments, the ignition device of the active prechamber engine further comprises a controller 106 capable of acquiring the phase relationship between the crankshaft and the camshaft, and the controller 106 is simultaneously connected with the vehicle computer, the spark plug 102, the metering valve 104, the gas nozzle 107, and the like. While the controller 106 is able to control the timing of the opening and closing of the intake and

exhaust valves

40 and 50 via the camshaft, and thus the amount of combustible gas entering the active prechamber 101 via the metering valve 104.

In some embodiments, the controller 106 may also be capable of controlling the timing of fuel injection from the gas injector 107, the injection amount, and the ignition timing of the spark plug 102 by acquiring the phase relationship of the crankshaft and the camshaft, and controlling the opening and closing timings of the intake valve 40 and the exhaust valve 50 via the camshaft.

To sum up, the utility model discloses an initiative prechamber formula engine ignition has following advantage: according to the application, the precombustion chamber assembly is arranged in the cylinder cover, the active precombustion chamber is arranged in the precombustion chamber, the spark plug is arranged in the precombustion chamber, and combustible gas is provided for the active precombustion chamber through the gas supply branch consisting of the metering valve, the one-way valve and the gas inlet connecting pipe, so that the combustible gas in the precombustion chamber is in an active gas supply form, and the one-way valve can ensure that the combustible gas cannot flow backwards from the precombustion chamber; meanwhile, the phase relation of a crankshaft and a camshaft is collected through a controller, and the phase relation is matched with the camshaft to control an intake valve and an exhaust valve, so that the combustible gas injection time and the combustible gas injection quantity of a precombustion chamber and a nozzle and the ignition time of a spark plug are controlled. Therefore, the quick and stable lean mixture combustion can be realized by using lower ignition energy, and the backfire fault of the air inlet pipe is avoided. The gas engine has the advantages of simple structure and high reliability, and can realize composite staged combustion of the gas engine.

The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application, to thereby enable others skilled in the art to make and utilize various exemplary embodiments of the invention and various alternatives and modifications. It is intended that the scope of the invention be defined by the claims and their equivalents.

Claims

1. An active prechamber engine ignition device, comprising:

a pre-chamber assembly disposed within a cylinder head, the pre-chamber assembly comprising an active pre-chamber disposed at a lower portion of the pre-chamber assembly, an injection port of the active pre-chamber disposed between an intake valve and an exhaust valve of the cylinder head and facing a combustion chamber;

a spark plug disposed within the pre-chamber assembly with a firing portion of the spark plug exposed within the active pre-chamber;

the air inlet connecting pipe is arranged in the cylinder cover, and one end of the air inlet connecting pipe is communicated with an air inlet of the active pre-combustion chamber;

the air outlet of the metering valve is communicated with the other end of the air inlet connecting pipe, and the air inlet of the metering valve is communicated with a combustible gas supply pipeline;

the gas nozzle is arranged on the cylinder cover, is communicated with the combustible gas supply pipeline and is used for spraying combustible gas to the combustion chamber; and

an intake pipe communicating with an intake valve provided in the cylinder head, the intake pipe configured to supply air to the combustion chamber through the intake valve.

2. The active pre-chamber engine ignition device of claim 1, further comprising a check valve disposed between the other end of the intake connecting tube and an outlet of the metering valve, the check valve configured to control a flow of combustible gas from the metering valve to the active pre-chamber only.

3. The active pre-chamber engine ignition device of claim 2, wherein the metering valve, the one-way valve, and the intake connecting tube constitute an intake branch.

4. The active prechamber engine ignition device of claim 1, further comprising a controller that can capture the phase relationship of the crankshaft and camshaft, and control the opening and closing timing of the intake and exhaust valves via the camshaft, and thus the amount of combustible gas entering the active prechamber via the metering valve.

5. The active pre-chamber engine ignition device according to claim 4, wherein the controller is further configured to control the fuel injection timing, the injection amount, and the ignition timing of the ignition plug of the gas nozzle by acquiring a phase relationship of the crankshaft and the camshaft, and controlling the opening and closing timings of the intake valve and the exhaust valve by the camshaft.