CN214366432U

CN214366432U - Air supply system for pre-combustion chamber and engine with air supply system

Info

Publication number: CN214366432U
Application number: CN202022365013.2U
Authority: CN
Inventors: 孔龙; 王令金; 徐清祥
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2020-10-22
Filing date: 2020-10-22
Publication date: 2021-10-08
Anticipated expiration: 2030-10-22

Abstract

The utility model particularly relates to an engine that is used for air supply system of precombustor and has it. An air supply system for a prechamber comprising: the gas supply pipeline is provided with a gas storage bottle, a first supercharger, a first pressure regulator, a first flowmeter and a mixed gas storage bottle, the combustion-supporting gas supply pipeline is provided with the combustion-supporting gas storage bottle, a second supercharger, a second pressure regulator, a second flowmeter and the mixed gas storage bottle, the mixed gas supply pipeline of the pressure regulator is connected with the mixed gas storage bottle of the pressure regulator, and the mixed gas supply pipeline of the pressure regulator is used for communicating the mixed gas storage bottle of the pressure regulator and the precombustion chamber. The utility model discloses a normal operating of engine is guaranteed to the air supply system for precombustion chamber, can the air-fuel ratio of the gas mixture of accurate control supply to the precombustion chamber, the ignition degree of difficulty of gas mixture in the reduction precombustion chamber.

Description

Air supply system for pre-combustion chamber and engine with air supply system

Technical Field

The utility model belongs to the technical field of the vehicle, concretely relates to an engine that is used for air feed system of precombustor and has it.

Background

The air supply system for a prechamber with large cylinder diameter, lean-running combustion gas usually comprises a prechamber assembly in order to ensure an ignition process in the air supply system for the prechamber. The precombustion chamber is communicated with the main combustion chamber through the jet holes, and the fuel gas is ignited in the precombustion chamber and then enters the main combustion chamber through the jet holes so as to ignite the mixed gas in the main combustion chamber. However, when the piston in the main combustion chamber was during compression stroke, the gas mixture in the main combustion chamber was compressed and got into in the precombustion chamber through the orifice to can't guarantee the air-fuel ratio of the gas mixture in the precombustion chamber, in addition, the residual gas after the gas mixture burning in the precombustion chamber also can influence the air-fuel ratio of the gas mixture in the precombustion chamber, thereby increases the degree of difficulty of igniting of the gas mixture in the precombustion chamber, and then influences the normal operating of the air supply system who is used for the precombustion chamber.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the problem that the air-fuel ratio of the mixed gas in the prior precombustion chamber is difficult to control at least. The purpose is realized by the following technical scheme:

the utility model discloses a first aspect provides a gas supply system for precombustor, a gas supply system for precombustor includes:

the gas supply pipeline is sequentially provided with a gas storage bottle, a first supercharger, a first pressure regulator and a mixed gas storage bottle, and the gas supply pipeline is also provided with a first flowmeter which is arranged at any position between the gas storage bottle and the mixed gas storage bottle on the gas supply pipeline;

the combustion-supporting gas supply pipeline is sequentially provided with a combustion-supporting gas storage bottle, a second supercharger, a second pressure regulator and the mixed gas storage bottle, and the combustion-supporting gas supply pipeline is also provided with a second flow meter which is arranged at any position between the combustion-supporting gas storage bottle and the mixed gas storage bottle on the combustion-supporting gas supply pipeline;

the mixed gas supply pipeline is connected with the mixed gas storage bottle and is used for communicating the mixed gas storage bottle and the pre-combustion chamber.

The utility model discloses air supply system, the air-fuel ratio of the gas mixture that can accurate control supplies the precombustion chamber, simultaneously, because the gas all is greater than the combustion chamber internal pressure with combustion-supporting gas's pressure to guarantee that the gas mixture of high pressure gets into after the precombustion chamber with the burning residual gas in the precombustion chamber and by the gas discharge who gets into the precombustion chamber in the combustion chamber, thereby guarantee the air-fuel ratio in the precombustion chamber, reduce the degree of difficulty of igniting of the gas mixture in the precombustion chamber, guarantee the normal operating of engine.

In addition, according to the utility model discloses a gas supply system for precombustor, can also have following technical characterstic:

in some embodiments of the present invention, the air supply system for the prechamber comprises:

the fuel gas supply pipeline is sequentially provided with a fuel gas storage bottle, a first flowmeter and a mixed gas storage bottle;

the combustion-supporting gas supply pipeline is sequentially provided with a combustion-supporting gas storage bottle, a second flowmeter and the mixed gas storage bottle;

the mixed gas supply pipeline is connected with the mixed gas storage bottle and is used for communicating the mixed gas storage bottle and the pre-combustion chamber, and a supercharger and a third pressure regulator are sequentially arranged on the mixed gas supply pipeline along the direction from the mixed gas storage bottle to the pre-combustion chamber.

In some embodiments of the present invention, the gas supply system for the prechamber further comprises a gas rail and a plurality of mixture supply branches, the mixture supply line passes through the gas rail communication with the plurality of mixture supply branches, the mixture supply branches are used for communicating the prechamber.

In some embodiments of the present invention, the mixed gas supply branch is provided with an electromagnetic valve.

In some embodiments of the present invention, a check valve is disposed on the mixture supply branch.

The utility model discloses an in some embodiments, first voltage regulator all includes gaseous cushion flask, sets up with the second voltage regulator pressure sensor in the gaseous cushion flask is in with the setting air-vent valve on the gaseous cushion flask.

In some embodiments of the present invention, the gas buffer bottle is a sealed container.

The utility model discloses the second aspect provides an engine, the engine includes prechamber, main combustion chamber and air supply system, the prechamber is used for the intercommunication main combustion chamber with air supply system, wherein, air supply system is according to any embodiment of the aforesaid an air supply system for the prechamber.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like parts are designated by like reference numerals throughout the drawings. In the drawings:

fig. 1 is a schematic structural diagram of an engine according to an embodiment of the present invention;

fig. 2 is a schematic structural view of an engine according to another embodiment of the present invention;

fig. 3 is a schematic diagram showing the relationship between the pressure of the mixture gas in the precombustion chamber and the pressure in the main combustion chamber (in-cylinder pressure).

The reference symbols in the drawings denote the following:

100: a gas supply system for the prechamber;

10: gas supply line, 11: gas storage bottle, 12: gas mixture storage bottle, 13: first flowmeter, 14: first supercharger, 15: a first voltage regulator;

20: combustion-supporting gas supply line, 21: combustion-supporting gas storage bottle, 22: second flowmeter, 23: second supercharger, 24: a second voltage regulator;

30: mixture gas supply line, 31: third supercharger, 32: a third voltage regulator;

40: an air rail;

50: mixture gas supply branch, 51: electromagnetic valve, 52: a one-way valve;

200: precombustion chamber, 201: a spark plug.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and groups thereof.

Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and sections, these elements, components, regions, layers and sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

For convenience of description, spatially relative terms, such as "inner", "outer", "lower", "below", "upper", "above", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" can include both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

As shown in fig. 1, an embodiment of the first aspect of the present invention provides a gas supply system 100 for a prechamber, the gas supply system 100 for the prechamber comprising: the combustion-supporting gas supply system comprises a gas supply pipeline 10, a combustion-supporting gas supply pipeline 20 and a mixed gas supply pipeline 30, and specifically, a gas storage bottle 11, a first pressure booster 14, a first pressure regulator 15 and a mixed gas storage bottle 12 are sequentially arranged on the gas supply pipeline 10, a first flow meter 13 is arranged on the gas supply pipeline 10 and is positioned between the first pressure regulator 15 and the mixed gas storage bottle 12, a combustion-supporting gas storage bottle 21, a second pressure booster 23, a second pressure regulator 24 and the mixed gas storage bottle 12 are sequentially arranged on the combustion-supporting gas supply pipeline 20, a second flow meter 22 is arranged on the combustion-supporting gas supply pipeline 20 and is positioned between the second pressure regulator 24 and the mixed gas storage bottle 12, the mixed gas supply pipeline 30 is connected with the mixed gas storage bottle 12, and the mixed gas supply pipeline 30 is used for communicating the mixed gas storage bottle 12 with the precombustion chamber 200. In other embodiments of the present invention, the first flow meter 13 may be disposed on the gas supply pipeline 10 and located at any position between the gas storage bottle 11 and the mixed gas storage bottle 12, for example, the first flow meter 13 may also be disposed between the first pressure booster 14 and the first pressure regulator 15 or between the first pressure regulator 15 and the gas storage bottle 11, and similarly, the second flow meter 22 may be disposed on the combustion-supporting gas supply pipeline 20 and located at any position between the combustion-supporting gas storage bottle 21 and the mixed gas storage bottle 12, for example, the second flow meter 22 may be disposed between the second pressure booster 23 and the second pressure regulator 24 or between the second pressure booster 23 and the combustion-supporting gas storage bottle 21.

According to the embodiment of the present invention, in the gas supply system 100 for the prechamber, the gas and the combustion-supporting gas (e.g. oxygen, air) enter the mixed gas storage bottle 12 through the gas supply pipeline 10 and the combustion-supporting gas supply pipeline 20 respectively and are mixed in the mixed gas storage bottle 12, and then are transported to the prechamber 200 through the mixed gas supply pipeline 30, thereby realizing the supply of the gas used in the prechamber 200. When the gas flows in the gas supply pipeline 10, the first pressure booster 14 boosts the gas, the first pressure regulator 15 regulates the pressure of the boosted gas so that the regulated gas pressure is greater than the gas pressure in the main combustion chamber, then the first flow meter 13 precisely regulates the flow of the gas entering the mixed gas storage bottle 12, similarly, when the combustion-supporting gas flows in the combustion-supporting gas supply pipeline 20, the second pressure booster 23 boosts the combustion-supporting gas, the second pressure regulator 24 regulates the pressure of the boosted combustion-supporting gas so that the regulated combustion-supporting gas pressure is greater than the gas pressure in the main combustion chamber, the combustion-supporting gas precisely regulates the flow of the combustion-supporting gas entering the mixed gas storage bottle 12 through the second flow meter 22, the air-fuel ratio of the mixture in the mixture storage bottle 12 is controlled by the cooperation of the first flowmeter 13 and the second flowmeter 22. The utility model discloses air supply system, the air-fuel ratio of the gas mixture that can accurate control supplies the precombustion chamber, simultaneously, because the gas all is greater than the combustion chamber internal pressure with combustion-supporting gas's pressure to guarantee that the gas mixture of high pressure gets into after the precombustion chamber with the burning residual gas in the precombustion chamber and by the gas discharge who gets into the precombustion chamber in the combustion chamber, thereby guarantee the air-fuel ratio in the precombustion chamber, reduce the degree of difficulty of igniting of the gas mixture in the precombustion chamber, guarantee the normal operating of engine.

In other embodiments of the present invention, as shown in fig. 2, a gas supply system 100 for a prechamber comprises: the combustion-supporting gas supply system comprises a gas supply pipeline 10, a combustion-supporting gas supply pipeline 20 and a mixed gas supply pipeline 30, and specifically, a gas storage bottle 11, a first flow meter 13 and a mixed gas storage bottle 12 are sequentially arranged on the gas supply pipeline 10, a combustion-supporting gas storage bottle 21, a second flow meter 22 and a mixed gas storage bottle 12 are sequentially arranged on the combustion-supporting gas supply pipeline 20, the mixed gas supply pipeline 30 is connected with the mixed gas storage bottle 12, the mixed gas supply pipeline 30 is used for communicating the mixed gas storage bottle 12 with the pre-combustion chamber 200, and a third pressure booster 31 and a third pressure booster 32 are sequentially arranged on the mixed gas supply pipeline 30 along the direction from the mixed gas storage bottle 12 to the pre-combustion chamber 200. The fuel gas and the combustion-supporting gas respectively enter the mixed gas storage bottle 12 through the fuel gas supply pipeline 10 and the combustion-supporting gas supply pipeline 20, wherein the first flow meter 13 and the second flow meter 22 respectively regulate the flow rate of the fuel gas and the flow rate of the combustion-supporting gas so as to control the air-fuel ratio of the mixed gas in the mixed gas storage bottle 12. The gas mixture of certain proportion passes through gas mixture supply line 30 and gets into prechamber 200, wherein, third booster 31 carries out the pressure boost to the gas mixture, then third pressure regulator 32 adjusts the pressure of gas mixture, pressure in order to guarantee that the pressure of gas mixture is greater than main combustion, thereby make the gas mixture get into prechamber 200 back with its inside other gas discharge in the main combustion chamber, and then guarantee the air-fuel ratio of the gas mixture in prechamber 200, reduce the ignition degree of difficulty of gas mixture in prechamber 200.

Specifically, the first supercharger 14, the second supercharger 23, and the third supercharger 31 may be compressors. The first and

second flowmeters

13 and 22 may be flow meters with proportional valves through which the flow rate of the gas can be regulated, and through which the flow rate of the gas can be controlled.

Further, the first pressure regulator 15, the second pressure regulator 24 and the third pressure regulator 32 each include a gas buffer bottle (not shown in the figure), a pressure sensor (not shown in the figure) disposed in the gas buffer bottle, and a pressure regulating valve (not shown in the figure) disposed on the gas buffer bottle. After the gas enters the gas buffer bottle, the pressure sensor senses the pressure in the gas buffer bottle, and the pressure regulating valve is adjusted according to the pressure in the gas buffer bottle, so that the pressure in the gas buffer bottle is greater than the pressure in the main combustion chamber.

In some embodiments of the present invention, the air supply system 100 for the prechamber further comprises an air rail 40 and a plurality of mixture supply branches 50, the mixture supply line 30 is in communication with the plurality of mixture supply branches 50 through the air rail 40, and the mixture supply branches 50 are used for communicating with the prechamber 200. The mixture enters the mixture supply pipeline 30 from the mixture storage bottle 12, then enters the plurality of mixture supply branches 50 through the air rail 40, and finally enters the plurality of pre-combustion chambers 200 corresponding to the plurality of mixture supply branches 50 one by one. Wherein, the air rail 40 can play the role of stabilizing the pressure, and ensure the consistency of the mixed gas entering each pre-combustion chamber 200.

In some embodiments of the present invention, the mixture supply branch 50 is provided with a solenoid valve 51, and can be electrically connected to the ECU of the engine through the solenoid valve 51, as shown in fig. 3 (where, the horizontal coordinate represents crank angle, and the vertical coordinate represents pressure in the main combustion chamber), during the piston compression stroke, the pressure P1 of the mixture is greater than the pressure in the main combustion chamber within any crank angle range (corresponding to the time range t when the piston moves within the crank angle range), the ECU can control the solenoid valve 51 to open, so that the mixture with the pressure P1 enters the pre-combustion chamber 200, in this embodiment, the ECU controls the solenoid valve 51 to open when the ignition time is reached and the piston moves to the top dead center position, so as to ensure that all residual gas in the pre-combustion chamber 200 is discharged into the main combustion chamber, and avoid the residual gas from entering the pre-combustion chamber 200 again under the action of the piston, which in turn affects the air-fuel ratio of the mixture within the pre-chamber 200.

In some embodiments of the present invention, a check valve 52 is disposed on the mixture supply branch 50, and the check valve 52 is used to prevent the mixture in the pre-combustion chamber 200 from entering the air rail 40 through the mixture supply branch 50, thereby affecting the air-fuel ratio of the mixture in the air rail 40.

The utility model discloses an in some embodiments, gaseous cushion flask is sealed container to avoid the gas leakage in the gaseous cushion flask, guarantee first voltage regulator 15, second voltage regulator 24 and third voltage regulator 32's accuracy nature.

An embodiment of the second aspect of the present invention provides an engine, the engine includes a prechamber 200, a main combustion chamber and an air supply system, the prechamber 200 is used for communicating the main combustion chamber and the air supply system, wherein the air supply system is the air supply system 100 for the prechamber according to any of the above embodiments.

According to the utility model discloses the engine, the air-fuel ratio of the gas mixture that can accurate control supply to the precombustion chamber, simultaneously, because the gas all is greater than the main combustion chamber internal pressure with combustion-supporting gas's pressure to guarantee that the gas mixture of high pressure gets into after the precombustion chamber with the burning residual gas in the precombustion chamber and by the gas discharge of entering the precombustion chamber in the main combustion chamber, thereby guarantee the air-fuel ratio in the precombustion chamber, reduce the degree of difficulty of igniting of the gas mixture in the precombustion chamber, guarantee the normal operating of engine.

In some embodiments of the present invention, the engine further comprises an ECU electrically connected to the first pressure regulator 15, the second pressure regulator 24, the first flow meter 13, the second flow meter 22, the electromagnetic valve 51, and the spark plug 201 disposed in the pre-combustion chamber 200, respectively, to control the operation of each component.

The utility model discloses a concrete working process of engine:

firstly, controlling a gas supply system 100 for a precombustion chamber to start, respectively pressurizing gas and combustion-supporting gas by a first pressure booster 14 and a second pressure booster 23, respectively pressurizing the gas and the combustion-supporting gas by an ECU (electronic control Unit) controlling a first pressure regulator 15 and a second pressure regulator 24 to respectively regulate the pressure of the pressurized gas and the pressurized combustion-supporting gas so that the pressure of the gas and the combustion-supporting gas is kept at P1(P1 is greater than the pressure in a main combustion chamber), respectively regulating the flow rates of the gas with certain pressure and the combustion-supporting gas with certain pressure by a first flow meter 13 and a second flow meter 22 so as to control the air-fuel ratio of mixed gas formed in a mixed gas storage bottle 12 after entering the mixed gas storage bottle 12 to be 0.7-1, and enabling the mixed gas with high pressure and accurate air-fuel ratio to enter a mixed gas supply branch 50 through a gas rail 40;

then, in each compression cycle of each piston, before ignition of the ignition plug 201 and at the time when the piston approaches the position of the top dead center, the ECU controls the electromagnetic valve 51 to open so that the mixture of high pressure and precise air-fuel ratio enters the pre-chamber 200;

finally, the ECU controls the ignition plug 201 to ignite, the mixture in the pre-combustion chamber 200 is ignited, and the pre-combustion chamber 200 injects the ignited mixture into the main combustion chamber through the nozzle holes, thereby igniting the gas in the main combustion chamber.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An air supply system for a prechamber, characterized in that the air supply system for a prechamber comprises:

2. The gas supply system for a prechamber as claimed in claim 1, characterized in that the first and second pressure regulators each comprise a gas buffer bottle, a pressure sensor arranged in the gas buffer bottle and a pressure regulating valve arranged on the gas buffer bottle.

3. A gas supply system for a pre-chamber as claimed in claim 2, wherein the gas buffer bottles are sealed containers.

4. An air supply system for a prechamber, characterized in that the air supply system for a prechamber comprises:

the mixed gas supply pipeline is connected with the mixed gas storage bottle and used for communicating the mixed gas storage bottle and the pre-combustion chamber, and a third supercharger and a third pressure regulator are sequentially arranged on the mixed gas supply pipeline along the direction from the mixed gas storage bottle to the pre-combustion chamber.

5. An air supply system for a prechamber as claimed in claim 1 or 4, characterized in that the air supply system further comprises an air rail and a number of mixture supply branches, through which the mixture supply line communicates with the number of mixture supply branches, which mixture supply branches are intended to communicate with the prechamber.

6. An air supply system for a prechamber as claimed in claim 5, characterized in that the mixture supply branch is provided with a solenoid valve.

7. An air supply system for a pre-chamber as claimed in claim 6, characterised in that the mixture supply branch is provided with a one-way valve.

8. An engine comprising a prechamber for communicating the main combustion chamber with an air supply system, a main combustion chamber and an air supply system, wherein the air supply system is an air supply system for a prechamber according to claim 1 or 4.