Active ignition system and gas engine

Abstract

The utility model provides an active ignition system and a gas engine, and relates to the field of gas engines. The active ignition system comprises an air conveying pipeline, a first fuel gas pipeline, a mixer, a combustion chamber, a second fuel gas pipeline and a pre-combustion chamber, the air conveying pipeline and the first fuel gas pipeline are connected with the mixer, the mixer is connected with the combustion chamber, the second fuel gas pipeline is connected with the pre-combustion chamber, and the pre-combustion chamber is located in the combustion chamber and communicated with the combustion chamber. Air is conveyed into the mixer through the air conveying pipeline, fuel gas is conveyed into the mixer through the first fuel gas pipeline, a combustion mixture is conveyed into the combustion chamber through the mixer, fuel gas is conveyed into the pre-combustion chamber through the second fuel gas pipeline, the fuel gas is ignited in the pre-combustion chamber, and flames enter the combustion chamber to achieve ignition; and the effect of accurately controlling the air inflow is achieved.

Description

Technical Field

[0001] The present application relates to the field of gas engines, and in particular to an active ignition system and a gas engine. Background Art

[0002] High-power gas engines usually use a pre-combustion chamber structure to improve the ignition method, so as to achieve the purpose of increasing the ignition energy and the air-fuel ratio, improving the combustion speed in the cylinder, and reducing the exhaust temperature and emissions.

[0003] At present, there are many different ways of air intake in the pre-combustion chamber structure, such as mechanical cam control, solenoid valve control, etc. Among them, the mechanical cam control method is to achieve intake control by driving the valve by cam, which has a complex structure and cannot accurately control the intake volume according to the actual working conditions of the gas engine. The solenoid valve control method is to achieve accurate control of the intake volume through an electronic control unit (English full name Electronic Control Unit, English abbreviation ECU), but the solenoid valve control method has a complex structure, the reliability of the solenoid valve itself is poor, and it is very easy to fail.

[0004] Therefore, how to improve the air intake method of gas engines has become an urgent problem to be solved. Utility Model Content

[0005] The purpose of the present application is to provide an active ignition system and a gas engine, which can achieve precise control of the intake volume, and the present application has a simple structure and high reliability.

[0006] In a first aspect, the utility model provides an active ignition system, which includes an air delivery pipeline, a first gas pipeline, a mixer, a combustion chamber, a second gas pipeline, and a pre-combustion chamber. The air delivery pipeline and the first gas pipeline are respectively connected to the mixer, the mixer is connected to the combustion chamber, the second gas pipeline is connected to the pre-combustion chamber, and the pre-combustion chamber is located in the combustion chamber and communicated with the combustion chamber.

[0007] In an optional embodiment, the first gas pipeline includes a first pressure regulator, a first solenoid valve, a flame arrester and a gas valve which are connected in sequence, and the gas valve is connected to the mixer.

[0008] In an optional embodiment, the second gas pipeline includes a compressor, a cold dryer, a gas storage tank, a first ball valve, a first filter, a second solenoid valve, and a second pressure regulator which are connected in sequence, and the second pressure regulator is connected to the pre-combustion chamber via a gas supply pipe.

[0009] In an optional embodiment, the active ignition system further includes a supercharger compressor, an intercooler, and an intake manifold connected in sequence, wherein the supercharger compressor is connected to the mixer, and the intake manifold is connected to the combustion chamber.

[0010] In an optional embodiment, the active ignition system further includes a first balancing pipe and a second balancing pipe, wherein the first balancing pipe is connected to a main air outlet of the second pressure regulator, and the second balancing pipe is connected to the intake manifold.

[0011] In an optional embodiment, the number of the pre-combustion chambers is multiple, the number of the combustion chambers is multiple, the intake manifold is provided with multiple intake branch pipes, the air supply pipe is provided with multiple air supply branch pipes, and the number of the air supply branch pipes, the intake branch pipes, the combustion chambers and the pre-combustion chambers is the same and corresponds one to one.

[0012] In an optional embodiment, each of the gas supply branch pipes is equipped with a flow limiting valve and a one-way valve.

[0013] In an optional embodiment, the active ignition system further includes a main gas pipeline having a first output end and a second output end, wherein the first output end is connected to the input end of the first gas pipeline, and the second output end is connected to the input end of the second gas pipeline.

[0014] In an optional embodiment, the gas pipeline includes a second ball valve and a second filter, the second ball valve is connected to the second filter, and the second filter is provided with the first output end and the second output end.

[0015] In a second aspect, the utility model provides a gas engine, comprising the active ignition system described in the aforementioned embodiment.

[0016] Compared with the prior art, the beneficial effects of this application are:

[0017] The present application delivers air to the mixer through an air delivery pipeline, and delivers gas to the mixer through a first gas pipeline, realizes a first mixing in the mixer to obtain a combustion mixture, and then the present application also uses the mixer to deliver the combustion mixture to the combustion chamber, and the second gas pipeline delivers gas to a pre-combustion chamber, ignites the gas in the pre-combustion chamber, and the flame enters the combustion chamber to realize ignition. The present application can accurately control the intake amount. In addition, the present application is a mechanical connection structure with a simple structure and good reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 shows a connection diagram of an active ignition system in some embodiments;

[0020] Figure 2 A schematic diagram showing the connection of the first gas pipeline in some embodiments is shown;

[0021] Figure 3 A connection diagram of a second gas pipeline in some embodiments is shown;

[0022] Figure 4 A schematic diagram showing the connection between the pre-combustion chamber and the combustion chamber in some embodiments is shown;

[0023] Figure 5 A connection schematic diagram of a gas main pipeline in some embodiments is shown.

[0024] Description of main component symbols:

[0025] 100-air delivery pipeline; 110-air filter; 200-first gas pipeline; 210-first pressure regulator; 220-first solenoid valve; 230-flame arrester; 240-gas valve; 300-mixer; 400-combustion chamber; 500-second gas pipeline; 510-compressor; 520-dryer; 530-gas storage tank; 540-first ball valve; 550-first filter; 560-second solenoid valve; 570-second pressure regulator; 600-precombustion chamber; 700-air supply pipe; 710-air supply branch pipe; 711-flow limiting valve; 712-check valve; 800-supercharger compressor; 900-intercooler; 1000-intake manifold; 1100-intake branch pipe; 1200-first balance pipe; 1300-second balance pipe; 1400-gas main pipeline; 1410-second ball valve; 1420-second filter. DETAILED DESCRIPTION

[0026] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0027] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0028] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0029] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be a connection between two elements or an interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0030] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0031] Embodiment 1

[0032] See also Figure 1 This embodiment provides an active ignition system. Specifically, the active ignition system includes an air delivery pipeline 100, a first gas pipeline 200, a mixer 300, a combustion chamber 400, a second gas pipeline 500, and a pre-combustion chamber 600.

[0033] The air delivery pipeline 100 is used to deliver air, and the air delivery pipeline 100 is connected to the mixer 300. In order to improve the cleanliness of the air, this embodiment adds an air filter 110 at the input end of the air delivery pipeline 100. In this way, the air entering the active ignition system is filtered, reducing the pollution of impurities to the active ignition system and extending the service life of this embodiment.

[0034] The first gas pipeline 200 is used to transport gas, and the first gas pipeline 200 is connected to the mixer 300, that is, the air transport pipeline 100 and the first gas pipeline 200 are connected to the mixer 300 respectively, and the air and gas are mixed for the first time in the mixer 300 to obtain a combustion mixture.

[0035] Please refer to Figure 1 and Figure 2 The first gas pipeline 200 includes a first pressure regulator 210, a first solenoid valve 220, a flame arrester 230 and a gas valve 240 connected in sequence. The first solenoid valve 220 is a double-electrically controlled solenoid valve. The gas valve 240 is connected to the mixer 300, and the gas valve 240 controls the gas supply through an electronic control unit. The larger the opening of the gas valve 240, the greater the gas supply.

[0036] The mixer 300 is connected to the combustion chamber 400 , and the combustion mixture enters the combustion chamber 400 through the mixer 300 .

[0037] Please refer to Figure 1 and Figure 3 The second gas pipeline 500 is used to transport gas, and the second gas pipeline 500 is connected to the pre-combustion chamber 600.

[0038] The second gas pipeline 500 includes a compressor 510, a cold dryer 520, a gas storage tank 530, a first ball valve 540, a first filter 550, a second solenoid valve 560, and a second pressure regulator 570 which are connected in sequence. The second pressure regulator 570 is connected to the pre-combustion chamber 600 via an air supply pipe 700. The gas in the second gas pipeline 500 is pressurized by the compressor 510, and then enters the cold dryer 520, the gas storage tank 530, the first ball valve 540, the first filter 550, the second solenoid valve 560, and the second pressure regulator 570 in sequence, and is finally input into the pre-combustion chamber 600 via the air supply pipe 700.

[0039] The compressor 510 is used to compress the fuel gas so that the pressure of the fuel gas reaches a preset value. In this embodiment, the preset value can be set to 6-8 bar.

[0040] The cold dryer 520 is used to reduce the temperature of the gas after being pressurized by the compressor 510, and to remove moisture from the gas to increase the dryness of the gas for subsequent combustion.

[0041] The gas tank 530 is used to maintain a preset pressure value at the input end of the pre-combustion chamber 600, and the gas tank 530 has a certain storage space to prevent the pressure of the pre-combustion chamber 600 from being affected by the gas delivery of the second gas pipeline 500. In this embodiment, the pressure value of the gas tank 530 can be set to be maintained between 4.6-4.7 bar.

[0042] The first filter 550 is configured as a precision filter, which can filter particles larger than 5 um to prevent the rear-end components from being clogged by particles and affecting the working accuracy.

[0043] The second pressure regulator 570 is used to automatically adjust the pressure of the gas entering the gas supply pipe 700 .

[0044] The pre-combustion chamber 600 is located in the combustion chamber 400 and communicated with the combustion chamber 400. The pre-combustion chamber 600 is ignited by a spark plug, which instantly ignites the gas in the pre-combustion chamber 600, and the burning flame ignites the combustion mixture in the combustion chamber 400 through a plurality of tiny pores of the pre-combustion chamber 600, thereby overcoming the disadvantage of uneven combustion effect of spark plug ignition.

[0045] Specifically, the pre-chamber 600 acts as an ignition amplifier, wherein a smaller volume of gas within the pre-chamber 600 is initially ignited by a spark plug, and the flame is then transferred to the combustion chamber 400 through a transfer passage, causing flame jets to expand into the combustion chamber 400. These flame jets promote rapid and complete combustion in the combustion chamber 400.

[0046] This embodiment also includes connecting a supercharger compressor 800, an intercooler 900, and an intake manifold 1000 in sequence. The supercharger compressor 800 is connected to the mixer 300. After the combustion mixture is pressurized by the supercharger compressor 800, it enters the intercooler 900 for cooling and then enters the intake manifold 1000. The intake manifold 1000 is connected to the combustion chamber 400.

[0047] Please refer to Figure 1 and Figure 4 This embodiment can be set as follows: there are multiple pre-combustion chambers 600, there are multiple combustion chambers 400, the intake manifold 1000 is provided with multiple intake branch pipes 1100, the air supply pipe 700 is provided with multiple air supply branch pipes 710, and the number of air supply branch pipes 710 and intake branch pipes 1100 is the same as that of the pre-combustion chambers 600 and corresponds one to one.

[0048] The gas supply pipe 700 is provided with a plurality of gas supply branch pipes 710, and each gas supply branch pipe 710 is equipped with a flow limiting valve 711 and a one-way valve 712. It is worth noting that the flow limiting valve 711 is used to control the amount of gas input, and the one-way valve 712 is opened in one direction under the action of the pressure difference. The gas in each gas supply branch pipe 710 is transported to the pre-combustion chamber 600 for combustion through the one-way valve 712, thereby solving the problem of gas reflux.

[0049] The pre-combustion chamber 600 includes an intake valve and an exhaust valve. When the gas engine is working, the intake valve is opened, the exhaust valve is closed, and the one-way valve 712 is opened because there is a pressure difference between the pre-combustion chamber 600 and the inlet of the gas supply pipe 700. At this time, the one-way valve 712 opens, and the gas in the gas supply pipe 700 enters the one-way valve 712 through the limiting valve 711 and is finally input into the pre-combustion chamber 600.

[0050] In this embodiment, the volume of each pre-combustion chamber 600 is set to be 0.75%-1% of the combustion chamber 400. The gas in the pre-combustion chamber 600 is ignited by a spark plug, and the flame is sprayed into the combustion chamber 400 through the injection hole at the bottom of the pre-combustion chamber 600, igniting the combustion mixture in the combustion chamber 400, achieving ignition, converting thermal energy into mechanical energy, and achieving the purpose of doing work.

[0051] For ease of description and understanding, this embodiment defines a group of pre-combustion chambers 600 and combustion chambers 400 as one cylinder. This embodiment has multiple cylinders, and the ignition method of multiple cylinders can quickly and accurately start the gas engine, providing a good user experience.

[0052] Please refer to Figures 1 to 3 Based on the above content, the use principle of the active ignition system is further described in this embodiment as follows:

[0053] S100. The filtered air is delivered from the air delivery line 100 to the mixer 300;

[0054] S200. A portion of the gas is sequentially transported to the mixer 300 through the first pressure regulator 210, the first solenoid valve 220, the flame arrester 230 and the gas valve 240, and the gas is mixed with the air to form a combustion mixture;

[0055] S300. The combustion mixture passes through the supercharger compressor 800, the intercooler 900, the intake manifold 1000, and finally is transported by the intake manifold 1000 to the combustion chamber 400 to be ignited;

[0056] S400. Another part of the gas passes through the compressor 510, the cold dryer 520, the gas storage tank 530, the first ball valve 540, the first filter 550, the second solenoid valve 560, the second pressure regulator 570, and enters the pre-combustion chamber 600 through the gas supply pipe 700;

[0057] S500. The gas in the pre-combustion chamber 600 is ignited by the spark plug, and the flame is sprayed toward the combustion chamber 400 through the injection hole at the bottom of the pre-combustion chamber 600, igniting the combustion mixture in the combustion chamber 400, thereby achieving ignition.

[0058] This embodiment can accurately control the intake volume. In addition, the present application is a mechanical connection structure with a simple structure and good reliability.

[0059] Embodiment 2

[0060] See also Figure 1 Based on the first embodiment, the present embodiment is improved in that the present embodiment further includes a first balance pipe 1200 and a second balance pipe 1300. The first balance pipe 1200 is connected to the main air outlet of the second pressure regulator 570, and the second balance pipe 1300 is connected to the intake manifold 1000. The pressure of the main air outlet is adjusted according to the pressure change of the intake manifold 1000, so that the pressure difference between the intake manifold 1000 and the air supply pipe 700 is within a preset standard range. The preset standard range should be set smaller to meet the use requirements of the active ignition system.

[0061] Embodiment 3

[0062] See also Figure 1 and Figure 5 This embodiment also includes a main gas pipeline 1400, which is provided with a first output end and a second output end. The first output end is connected to the input end of the first gas pipeline 200, and the second output end is connected to the input end of the second gas pipeline 500.

[0063] The main gas pipeline 1400 includes a second ball valve 1410 and a second filter 1420 . The second ball valve 1410 is connected to the second filter 1420 . The second filter 1420 is provided with the first output end and the second output end mentioned above.

[0064] In this embodiment, clean gas is supplied to the first gas pipeline 200 and the second gas pipeline 500 through the unified allocation of the main gas pipeline 1400 .

[0065] Embodiment 4

[0066] The present application provides a gas engine, which includes the active ignition system of embodiments 1 to 3.

[0067] See also Figure 1 and Figure 2 The gas valve 240 controls the gas supply through an electronic control unit so that the air and gas in the mixer 300 reach a reasonable air-fuel ratio to ensure that the excess air coefficient of the gas engine reaches 1.8-2.2, thereby stabilizing the temperature of each cylinder of the gas engine at around the preset value.

[0068] The pre-combustion chamber 600 is used to improve the ignition performance of the gas engine, so that the gas engine can operate with lean combustion gas to ensure smooth combustion of the mixture in the cylinder, which is beneficial to improving the efficiency of the gas engine and reducing the emission of NOx and unburned hydrocarbons, thereby leading to an overall improvement in the performance of the gas engine.

[0069] In this embodiment, a separate air supply system of an active ignition system supplies gas to the pre-combustion chamber 600, which is ignited by a spark plug, and the ignited flame is sprayed into the combustion chamber 400, so that the gas in the combustion chamber 400 is burned quickly and thoroughly, thereby accelerating the combustion speed in the cylinder of the gas engine, improving the air-fuel ratio and the efficiency of the gas engine, thereby achieving the effect of improving the performance of the gas engine and reducing emissions.

[0070] In addition, this embodiment is particularly suitable for gas engines with large cylinder diameters. Through a simple mechanical structure, air is quickly supplied to the pre-combustion chamber 600, thereby achieving precise air supply, reducing the unit failure rate, and saving unit costs.

[0071] The large-bore gas engine mentioned here is suitable for driving a generator that supplies electricity to a power grid. As a generator set, it is very critical to respond to sharp changes in load during transient conditions. Since there is a stroke between the compressor end and the intake manifold 1000, there is a time delay between the change in the fuel supply condition of the mixture and the mixture actually reaching the combustion chamber 400. This embodiment can improve the performance of the gas engine under transient operating conditions.

[0072] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0073] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. An active ignition system, characterized in that: It includes an air delivery pipeline, a first gas pipeline, a mixer, a combustion chamber, a second gas pipeline, and a pre-combustion chamber, wherein the air delivery pipeline and the first gas pipeline are respectively connected to the mixer, the mixer is connected to the combustion chamber, the second gas pipeline is connected to the pre-combustion chamber, and the pre-combustion chamber is located in the combustion chamber and communicated with the combustion chamber; The first gas pipeline comprises a first pressure regulator, a first solenoid valve, a flame arrester and a gas valve connected in sequence, and the gas valve is connected to the mixer; The second gas pipeline includes a compressor, a cold dryer, a gas storage tank, a first ball valve, a first filter, a second solenoid valve, and a second pressure regulator which are connected in sequence. The second pressure regulator is connected to the pre-combustion chamber through a gas supply pipe.

2. The active ignition system according to claim 1, characterized in that: It also includes a supercharger compressor, an intercooler, and an intake manifold connected in sequence, wherein the supercharger compressor is connected to the mixer, and the intake manifold is connected to the combustion chamber.

3. The active ignition system according to claim 2, characterized in that: It also includes a first balancing pipe and a second balancing pipe, wherein the first balancing pipe is connected to the main air outlet of the second pressure regulator, and the second balancing pipe is connected to the intake manifold.

4. The active ignition system according to claim 2 or 3, characterized in that: The number of the pre-combustion chambers is multiple, the number of the combustion chambers is multiple, the intake manifold is provided with multiple intake branch pipes, the air supply pipe is provided with multiple air supply branch pipes, the number of the air supply branch pipes, the intake branch pipes, the combustion chambers and the pre-combustion chambers is the same and corresponds one to one.

5. The active ignition system according to claim 4, characterized in that: Each of the gas supply branch pipes is equipped with a flow limiting valve and a one-way valve.

6. The active ignition system according to any one of claims 1 to 3, characterized in that: It also includes a gas main pipeline, which is provided with a first output end and a second output end, the first output end is connected to the input end of the first gas pipeline, and the second output end is connected to the input end of the second gas pipeline.

7. The active ignition system according to claim 6, characterized in that: The gas pipeline comprises a second ball valve and a second filter, the second ball valve is connected to the second filter, and the second filter is provided with the first output end and the second output end.

8. A gas engine, characterized in that: An active ignition system comprising any one of claims 1 to 7.

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