WO2018171286A1

WO2018171286A1 - Spark plug and engine having spark plug

Info

Publication number: WO2018171286A1
Application number: PCT/CN2017/119714
Authority: WO
Inventors: 李旺
Original assignee: 潍柴动力股份有限公司
Priority date: 2017-03-24
Filing date: 2017-12-29
Publication date: 2018-09-27
Also published as: CN106894934A

Abstract

A spark plug and an engine having a spark plug. The spark plug comprises a spark plug housing (1), the spark plug housing is provided thereon with a gas inlet (4) and a gas duct (5) in communication with the gas inlet, the gas duct can be in communication with a sealed chamber (6), and the sealed chamber is in communication with a pre-combustion chamber. When the pressure in the sealed chamber is lower than a predetermined value, a switch is switched on such that the sealed chamber is conducting to the gas duct; meanwhile, the required pure combustion gas or a higher concentration of a gaseous mixture of combustion gases can enter the gas duct from the gas inlet, through the sealed chamber to the pre-combustion chamber, and then enter a combustion chamber. In such a way, a higher concentration of combustion gas can be provided to a pre-combustion chamber through a spark plug to increase the content of combustible gas in the pre-combustion chamber after the pressure in a combustion chamber is decreased, thus ensuring normal activation and operation of an engine.

Description

Spark plug and engine with spark plug

The present application claims priority to Chinese Patent Application Serial No. JP-A No. No. No. No. No. No. No. No. No. No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No

Technical field

The present invention relates to the field of engine technology, and in particular to an engine and an electronically controlled oil pump thereof.

Background technique

Existing pre-chamber spark plugs, gas and air can only enter from the injection holes of the spark plug integrated pre-chamber structure.

Since the gas enters the pre-combustion chamber from the injection hole, the gas component of the pre-combustion chamber comes from the mixed gas in the cylinder, and the high air-fuel ratio in the gas in the cylinder causes the combustible component in the pre-combustion chamber to be too low, and the spark generated by the spark plug cannot be ignited. Pre-combustion indoor gas, engine fire problem.

Therefore, how to improve the composition of the combustible gas to ensure the stable operation of the engine is a technical problem that a person skilled in the art needs to solve at present.

Summary of the invention

In view of this, the present invention provides a spark plug for improving the composition of a combustible gas to ensure stable operation of the engine. The present invention also provides an engine having the above-described spark plug.

To achieve the above object, the present invention provides the following technical solutions:

A spark plug includes a spark plug housing, further comprising:

Gas supply device

An air inlet opening on the spark plug housing and capable of communicating with the air supply device;

An air passage communicating with the air inlet, the air passage being blocked at one end;

a sealed chamber communicating with the pre-chamber, the sealed chamber is in communication with the other end of the air passage, and the air passage is provided with a switch member capable of blocking the air passage, when the pressure in the sealed chamber is low When the preset value is reached, the switch member is opened, and the sealed chamber is electrically connected to the air passage.

Preferably, in the above spark plug, the air passage extends in an axial direction of the spark plug housing, and an end away from the pre-chamber is blocked, and a side close to the pre-chamber is connected to the sealed chamber. .

Preferably, in the above spark plug, the air passage is blocked by a wire plug.

Preferably, in the above spark plug, the switching member is a pressure switching valve.

Preferably, in the above spark plug, the sealed chamber and the pre-chamber are electrically connected by a diagonal air passage.

Preferably, in the above spark plug, the inner cavity of the spark plug housing is provided with:

Spiral wire

a wiring screw connected to the spiral wire;

An insulator disposed outside the wire screw, the insulator and the inner cavity of the spark plug housing being in contact with each other by a seal and a gasket.

Preferably, in the above-mentioned spark plug, the air supply device is an air supply joint, and the air supply device is sleeved on the outer side of the spark plug housing through a sealing ring.

Preferably, in the above spark plug, the lower side of the air supply device is in a position to be restrained from the boss of the spark plug housing, and the upper side is restrained on the spark plug housing by a pressing bolt.

An engine comprising a spark plug, wherein the spark plug is the spark plug of any of the above.

According to the above technical solution, the present invention discloses a spark plug including a spark plug housing, and the spark plug housing is provided with an air inlet and an air passage communicating with the air inlet, and the air passage can communicate with the sealed chamber. The sealed chamber is in communication with the pre-chamber. When the pressure in the sealed chamber is lower than the preset value, the switch member is opened, and the sealed chamber is electrically connected to the air passage. At this time, the pure gas or the gas mixture with a large concentration can enter the air passage through the air inlet. Enter the pre-combustion chamber through the sealed chamber and enter the combustion chamber. In the above manner, after the pressure in the combustion chamber is lowered, a large concentration of gas is supplied to the pre-combustion chamber through the spark plug, so as to improve the combustible gas composition in the pre-combustion chamber and ensure the normal starting and running of the engine.

DRAWINGS

1 is a cross-sectional view of a spark plug according to an embodiment of the present invention.

detailed description

The core of the invention is to provide a spark plug for improving the composition of the combustible gas to ensure stable operation of the engine. Another core of the present invention is to provide an engine having the above-described spark plug.

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

As shown in FIG. 1, the present invention discloses a spark plug including a spark plug housing 1 having an air inlet 4 and an air passage 5 communicating with the air inlet 4, the air passage 5 being capable of The sealed chamber 6 is in communication, and the sealed chamber 6 is in communication with the pre-chamber. When the pressure in the sealed chamber 6 is lower than a preset value, the switch member is opened, and the sealed chamber 6 is electrically connected to the air passage 5. At this time, the required pure gas or a gas mixture having a large concentration can pass through the air inlet 4 After entering the airway 5, it enters the pre-combustion chamber through the sealed chamber 6, and then enters the combustion chamber. In the above manner, after the pressure in the combustion chamber is lowered, a large concentration of gas is supplied to the pre-combustion chamber through the spark plug, so as to improve the combustible gas composition in the pre-combustion chamber and ensure the normal starting and running of the engine.

The gas supply device 11 is integrated in the spark plug to improve the air-fuel ratio of the engine, optimize the discharge and economy, and solve the problem that the pre-combustion chamber of the cylinder head or the bushing with the pre-chamber structure is too large, and the problem of excessive NOx is generated.

The air inlet described above can communicate with the air supply device 11 to charge the air passage 5 with pure gas or a gas mixture having a relatively high concentration through the air supply device 11. Since the air passage 5 is the air passage 5 directly processed in the existing spark plug structure, one end of the air passage 5 communicates with the outside, and in order to prevent gas leakage, it is necessary to block one end of the air passage 5 communicating with the outside, and The other end is in communication with the sealed compartment 6. The sealing method of the air passage 5 can be blocked by the wire plug 3. In practice, the rubber channel 5 can also be used to block the air passage 5, as long as the air passage 5 can be blocked.

The air passage 5 in the present application extends in the axial direction of the plug housing 1, specifically, the axis of the air passage 5 is parallel to the axis of the plug housing 1. Since the air passage 5 is directly processed on the existing spark plug housing 1, it is necessary to block one end away from the pre-chamber, that is, the side communicating with the outside is blocked, and the side close to the pre-chamber is sealed. The warehouse 6 is connected.

In a specific embodiment, the switch member is a pressure switch valve. Specifically, the pressure switching valve includes a valve body and a spring connected to the valve body and a spring seat coupled to the spring.

When the piston descends, the pressure in the pre-combustion chamber drops. Since the pre-combustion chamber communicates with the sealed chamber 6, the pressure in the sealed chamber 6 decreases synchronously, and when the pressure in the sealed chamber 6 drops below the gas in the air passage or the high-concentration gas is mixed. When the pressure of the gas is subtracted from the spring force of the spring, the valve body is opened, that is, the pressure switch valve is opened, and the gas or high-concentration gas mixed gas enters the sealed chamber 6 from the air passage and enters the pre-combustion chamber.

When the piston is ascending, the pressure inside the pre-combustion chamber rises, causing the pressure in the sealed chamber 6 to rise, and under the action of the spring, the valve body is closed, that is, the pressure switch valve is closed.

In a further embodiment, the spark plug further includes a slanted air passage 7 that communicates with the sealed chamber 6 and the pre-chamber. Since the oblique air passage 7 is also directly opened on the conventional spark plug, it is necessary to block the side of the oblique air passage 7 that communicates with the outside to prevent leakage. Rubber plugs can also be used for plugging methods through wire plugs. The size and inclination angle of the oblique air passage 7 can be set according to different needs, and are all within the protection range.

In a preferred embodiment, the inner cavity of the spark plug housing 1 is provided with a spiral wire 2, a wire screw 9 and an insulating member 10. The spiral wire 2 is connected to the connecting screw 9, the insulating member 10 is sleeved on the outer side of the connecting screw 9, and the insulating member 10 is restrained in the inner cavity of the spark plug housing 1 through the sealing member and the washer. The above-mentioned structure is realized by the spark plug itself. The structure of the function is the same as that of the prior art.

The air supply device 11 of the engine in the present application is an air supply joint, and is sleeved on the spark plug housing 1 through the seal ring 12, and the lower side of the air supply device 11 abuts against the boss of the spark plug housing 1, and the upper side passes through the pressure. The tightening bolt 13 is limited to the spark plug housing. Here, a connection manner of the air supply device 11 and the spark plug is provided, but the application is not limited thereto, as long as the air supply device can be supplied to the air passage through the air inlet. The gas is in the protection range, and the gas supply device can be fixed according to different needs.

In addition, the present application also discloses an engine including a spark plug, wherein the spark plug is the spark plug disclosed in the above embodiment, and therefore, the engine having the spark plug also has all the technical effects described above, and will not be further described herein. The spark plug described above is mounted in the engine spark plug mounting hole.

The various embodiments in the present specification are described in a progressive manner, and each embodiment focuses on differences from other embodiments, and the same similar parts between the various embodiments may be referred to each other.

The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments are obvious to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but the scope of the invention is to be accorded

Claims

A spark plug includes a spark plug housing (1), and further comprising:

Gas supply device (11);

An air inlet (4) opening on the spark plug housing (1) and capable of communicating with the air supply device (11);

An air passage (5) communicating with the air inlet (4), the air passage (5) being blocked at one end;

a sealed chamber (6) communicating with the pre-chamber, the sealed chamber (6) is in communication with the other end of the air passage (5), and the air passage is provided with a gas passage (5) capable of blocking the air passage (5) The switch member opens when the pressure in the sealed chamber (6) is lower than a preset value, and the sealed chamber (6) is electrically connected to the air passage (5).
The spark plug according to claim 1, wherein the air passage (5) extends in the axial direction of the plug housing (1), and is blocked away from an end of the pre-chamber, close to the pre- One side of the combustion chamber is in communication with the sealed chamber (6).
Spark plug according to claim 2, characterized in that the air passage (5) is blocked by a wire plug (3).
The spark plug of claim 1 wherein said switching member is a pressure switching valve.
The spark plug according to claim 1, characterized in that the sealed chamber (6) and the pre-chamber are electrically connected by a diagonal air passage (7).
The spark plug according to any one of claims 1 to 5, characterized in that the inner cavity of the spark plug housing (1) is provided with:

Spiral wire (2);

a connecting screw (9) connected to the spiral wire (2);

An insulator (10) disposed outside the wiring screw (9), the insulator (10) and the inner cavity of the spark plug housing (1) are in contact with each other through a seal and a gasket.
The spark plug according to any one of claims 1 to 5, wherein the air supply device (11) is a gas supply joint, and the gas supply device (11) is sleeved by the seal ring (12) The outside of the spark plug housing (1).
The spark plug according to claim 7, characterized in that the lower side of the air supply device (11) is in contact with the boss of the spark plug housing (1), and the upper side is limited by the pressing bolt (13). Positioned on the spark plug housing (1).
An engine comprising a spark plug, characterized in that the spark plug is a spark plug according to any of claims 1-8.