Small rotor engine combustion chamber spark plug cylinder surface ignition device and method

Abstract

The invention discloses a small rotor engine combustion chamber spark plug cylinder surface ignition device and method, and belongs to the technical field of small rotor engines. The device comprises a first working chamber, a second working chamber, a triangular rotor, a common spark plug, a spark plug channel, an ignition chamber, a sealing piece and a third working chamber. The engine further comprises an engine cylinder, a modified spark plug, a modified spark plug anode, a ceramic bushing, a groove and a copper electrode. An ignition chamber is removed, so that the energy loss is reduced, and the blow-by probability of two adjacent cylinders is reduced; under the condition that other structures are not changed, the compression ratio can also be improved, and the smaller the size of the engine is, the larger the increasing amplitude of the compression ratio is. The ignition position is improved from the interior of the ignition chamber to the cylinder surface, so that the flame propagation distance is greatly shortened, and the possibility of knocking and flame quenching of the small rotor engine is reduced; and the spark is in direct contact with the compressed fresh mixed gas, so that the ignition difficulty is greatly reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of small rotary engines, and in particular relates to a spark plug cylinder surface ignition device and method for a small rotary engine combustion chamber. Background Art

[0002] With the development of micro-electromechanical systems (MEMS) and the emergence of various miniaturized military equipment concepts, the development of micro-energy systems that are compact, lightweight, high in energy density, and capable of sustained operation has become a focus of international attention. Compared to traditional portable power sources, micro-engines, which use hydrocarbons as fuel, offer significantly higher energy density, stable voltage, and low cost. Therefore, micro-engines have broad application prospects in electronic devices across various sectors, including industry, agriculture, environmental protection, and healthcare. They can also directly power micro-machines such as micro-cars, micro-aircraft, and micro-pumps.

[0003] At present, depending on the fuel used, the ignition devices used for small rotary engines are mainly divided into two types: glow plug ignition device and spark plug ignition device.

[0004] Glow plug ignition systems are primarily used in small rotary engines that use low-flash-point fuels. In these small rotary engines, the glow plug maintains a continuously high temperature (above the fuel's closed flash point) to ignite the low-flash-point fuel. Examples of such fuels include methanol (closed flash point 8°C) and ethanol (closed flash point 12°C).

[0005] Spark plug ignition devices are mainly used in small gasoline small rotary engines, small kerosene small rotary engines and other small heavy oil small rotary engines. The fuel used in these small rotary engines cannot be ignited by electric glow plugs and can only be ignited by spark plugs with higher ignition energy.

[0006] Whether using a glow plug or spark plug ignition system, small rotary engines require a separate ignition chamber for the glow plug / spark plug, as well as a glow plug / spark plug channel (hereinafter referred to as the spark plug channel) connecting the ignition chamber and the combustion chamber. During normal operation of a conventional small rotary engine, a portion of the compressed combustible mixture within the combustion chamber is forced into the ignition chamber through the spark plug channel. After ignition by the glow plug / spark plug, a flame is generated, which then ignites the mixture within the combustion chamber through the spark plug channel. The presence of the ignition chamber inevitably increases the flame propagation distance, making ignition of the mixture more difficult and resulting in energy loss, hindering further efficiency improvements in small rotary engines. Furthermore, when the seals sweep across the spark plug channel, significant blowby occurs between adjacent combustion chambers, further reducing the performance of the small rotary engine. Summary of the Invention

[0007] In response to the above technical problems, the present invention provides a spark plug cylinder surface ignition solution for the combustion chamber of a small rotary engine.

[0008] The first aspect of the present invention provides a small rotary engine combustion chamber spark plug cylinder surface ignition device, the device comprising: a first working room (2), a second working room (3), a triangular rotor (4), a common spark plug (5), a spark plug channel (6), an ignition chamber (7), a sealing plate (8), and a third working room (9); and further comprising: an engine cylinder (1), a modified spark plug (10), a modified spark plug anode (13), a ceramic bushing (11), and a copper conductor (12); wherein:

[0009] The ceramic bushing (11) is made of insulating and high-temperature resistant material;

[0010] The spark plug (10) is modified by removing its own L-shaped cathode structure and making close contact with the anode;

[0011] The ceramic bushing (11) wraps the copper conductor (12), exposing only the two ends of the copper conductor (12) and the portion in contact with the anode of the modified spark plug (10). The two ends of the copper conductor (12) serve as new anodes, namely, copper conductor anode 1 (13) and copper conductor anode 2 (14).

[0012] The spark plug (10) is modified to divide the ignition energy into two parts, which are released at the copper conductor anode 1 (13) and the copper conductor anode 2 (14) respectively, and an igniter is used in conjunction with the spark plug;

[0013] A modified spark plug (10), a copper conductor (12), and a ceramic bushing (11) are installed on an engine cylinder (1), adapted to the structure and installation requirements of the modified spark plug (10), the copper conductor (12), and the bushing (11), and a modified spark plug (10), the copper conductor (12), and the bushing (11) are installed at the bottom of the cylinder, while leaving space for loading and unloading the modified spark plug (10), the copper conductor (12), and the bushing (11);

[0014] The engine cylinder (1) serves as the cathode of the modified spark plug (10) and is made of metal material.

[0015] Preferably, the modified spark plug (10), the copper conductor (12), and the bushing (11) are installed on the engine cylinder (1), and the installation position of the copper conductor (12) makes the copper conductor anode 1 (13) and the copper conductor anode 2 (14) close to the surface of the engine cylinder (1). The distance between the copper conductor anode 1 (13) and the copper conductor anode 2 (14) and the surface of the engine cylinder (1) makes the copper conductor anode 1 (13) and the copper conductor anode 2 (14) insulated from the cylinder surface on the engine cylinder (1) by the bushing (11). The copper conductor anode is connected to the air through the groove (15) on the ceramic bushing (11), and then the air is broken through at the ignition moment, and ignition is performed between the copper conductor anode 1 (13) and the copper conductor anode 2 (14) and the cylinder surface. The distance between the copper conductor anode 1 (13) and the copper conductor anode 2 (14) and the cylinder surface of the engine cylinder (1) makes the volume of the top of the copper conductor (12) connected to the combustion chamber (3) minimum.

[0016] Preferably, the ceramic bushing (11) wraps the copper conductor (12), exposing only the two ends of the copper conductor (12) and the portion in contact with the anode of the modified spark plug (10), and is installed together with the modified spark plug (10) and the copper conductor (12) inside the engine cylinder (1), and the copper conductor anode 1 (13) and the copper conductor anode 2 (14) are insulated from the engine cylinder (1). By insulating the copper conductor (12) from the engine cylinder (1), direct power is prevented between the copper conductor (12) and the engine cylinder (1), and ignition is then achieved through the position of the groove (15) provided on the bushing (11); the cathode of the modified spark plug (10) is the area corresponding to the groove (15) on the cylinder surface bushing (11) of the engine cylinder (1).

[0017] Preferably, the copper conductor anode 1 (13), the copper conductor anode 2 (14) and the engine cylinder (1) are insulated, and the ceramic bushing (11) is exposed to high-temperature and high-pressure combustion gas for a long time without failure.

[0018] Preferably, the side length difference between the bushing (11) and the copper conductor anode 1 (13) and the copper conductor anode 2 (14) is 0.2 mm to 0.5 mm, so that ignition is successful between the cylinder surface of the cylinder (1) and the copper conductor anode 1 (13) and the copper conductor anode 2 (14).

[0019] Preferably, the area of ​​the groove (15) is less than 0.15 mm 2 , so that the ignition between the cylinder surface of the cylinder (1) and the copper conductor anode 1 (13) and the copper conductor anode 2 (14) is successful, and no gas leakage is generated when the sealing sheet (8) sweeps across the groove (15) on the bushing (11).

[0020] Preferably, the device is in working condition:

[0021] The engine cylinder (1) is a fixed part in a small rotary engine that does not participate in complex rotational motion. The engine cylinder (1) and the triangular rotor (4) radially divide the internal space of the engine cylinder (1) into three independent working chambers, and each working chamber independently completes the four strokes of intake, compression, expansion, and exhaust.

[0022] The triangular rotor (4) performs complex planetary motion in the engine cylinder (1), and the path swept by the three vertex angles is the profile of the engine cylinder (1); when the triangular rotor (4) moves to a certain working chamber and reaches the minimum volume, the working chamber reaches the compression top dead center, and the working chamber becomes the combustion chamber (3);

[0023] The position of the combustion chamber (3) relative to the engine cylinder (1) is fixed, and the position of the combustion chamber (3) relative to the triangular rotor (4) is not fixed. Each arc edge of the triangular rotor (4) and the engine cylinder (1) enclose the combustion chamber (3);

[0024] The modified spark plug (10), the copper conductor (12), and the ceramic bushing (11) are installed below the profile of the engine cylinder (1) corresponding to the combustion chamber (3), and an ignition chamber (7) structure is provided below the closed profile;

[0025] The copper conductor anode 1 (13) and the copper conductor anode 2 (14) are close to the surface of the engine cylinder (1) and are directly exposed to the edge of the combustion chamber (3); the copper conductor anode 1 (13) and the copper conductor anode 2 (14) are insulated from the engine cylinder (1) by the ceramic bushing (11); the groove (15) structure in the ceramic bushing (11) enables the copper conductor anode 1 (13) and the copper conductor anode 2 (14) to meet the basic requirements of ignition at the designated position with the spark plug channel (6) on the engine cylinder (1);

[0026] During the operation of a small rotary engine, at the moment of compression top dead center, the induction magnet installed on the front balance weight triggers the Hall sensor, and then the rising edge of the Hall sensor signal triggers the ignition coil, gathering energy at the anode of the modified spark plug (10). At the same time, the copper conductor anode 1 (13) and the copper conductor anode 2 (14) pass through the groove (15) reserved in the bushing (11) and penetrate the air between the spark plug channel (6) on the engine cylinder (1), generating an electric spark at the edge of the combustion chamber (3); the position of the electric spark is the edge of the combustion chamber (3); the electric spark directly contacts the compressed fresh mixture; the spark is guided by the copper conductor anode 1 (13) and the copper conductor anode 2 (14) to the engine cylinder (1) and finally to the ground.

[0027] A second aspect of the present invention provides a method for igniting a spark plug cylinder surface in a combustion chamber of a small rotary engine. The method utilizes a spark plug cylinder surface ignition device in a combustion chamber of a small rotary engine to achieve ignition; wherein:

[0028] The device comprises: a first working chamber (2), a second working chamber (3), a triangular rotor (4), an ordinary spark plug (5), a spark plug channel (6), an ignition chamber (7), a sealing plate (8), a third working chamber (9), an engine cylinder (1), a modified spark plug (10), a modified spark plug anode (13), a ceramic bushing (11), and a copper conductor (12);

[0029] The method comprises:

[0030] The engine cylinder (1) is a fixed part in a small rotary engine that does not participate in complex rotational motion. The engine cylinder (1) and the triangular rotor (4) radially divide the internal space of the engine cylinder (1) into three independent working chambers, and each working chamber independently completes the four strokes of intake, compression, expansion, and exhaust.

[0031] The triangular rotor (4) performs complex planetary motion in the engine cylinder (1), and the path swept by the three vertex angles is the profile of the engine cylinder (1); when the triangular rotor (4) moves to a certain working chamber and reaches the minimum volume, the working chamber reaches the compression top dead center, and the working chamber becomes the combustion chamber (3);

[0032] The position of the combustion chamber (3) relative to the engine cylinder (1) is fixed, and the position of the combustion chamber (3) relative to the triangular rotor (4) is not fixed. Each arc edge of the triangular rotor (4) and the engine cylinder (1) enclose the combustion chamber (3);

[0033] The modified spark plug (10), the copper conductor (12), and the ceramic bushing (11) are installed below the profile of the engine cylinder (1) corresponding to the combustion chamber (3), and an ignition chamber (7) structure is provided below the closed profile;

[0034] The copper conductor anode 1 (13) and the copper conductor anode 2 (14) are close to the surface of the engine cylinder (1) and are directly exposed to the edge of the combustion chamber (3); the copper conductor anode 1 (13) and the copper conductor anode 2 (14) are insulated from the engine cylinder (1) by the ceramic bushing (11); the groove (15) structure in the ceramic bushing (11) enables the copper conductor anode 1 (13) and the copper conductor anode 2 (14) to meet the basic requirements of ignition at the designated position with the spark plug channel (6) on the engine cylinder (1);

[0035] During the operation of a small rotary engine, at the moment of compression top dead center, the induction magnet installed on the front balance weight triggers the Hall sensor, and then the rising edge of the Hall sensor signal triggers the ignition coil, gathering energy at the anode of the modified spark plug (10). At the same time, the copper conductor anode 1 (13) and the copper conductor anode 2 (14) pass through the groove (15) reserved in the bushing (11) and penetrate the air between the spark plug channel (6) on the engine cylinder (1), generating an electric spark at the edge of the combustion chamber (3); the position of the electric spark is the edge of the combustion chamber (3); the electric spark directly contacts the compressed fresh mixture; the spark is guided by the copper conductor anode 1 (13) and the copper conductor anode 2 (14) to the engine cylinder (1) and finally to the ground.

[0036] It can be seen that the present invention aims at the problems of long flame propagation distance, great ignition difficulty, serious energy loss, and serious blowby when the sealing plate sweeps over the ignition chamber of the traditional small rotor engine ignition device. The present invention discloses a small rotor engine combustion chamber spark plug cylinder surface ignition device and method to solve the technical problem of providing a spark plug ignition device and method that does not require an ignition chamber, that is, using a small rotor engine cylinder surface for direct ignition, so that the spark plug ignition position is improved from the inside of the ignition chamber to the cylinder surface, and at the same time, the ignition chamber is isolated from the combustion chamber, thereby eliminating the structure of the ignition chamber and the spark plug channel in the ignition device, avoiding the problems of long flame propagation distance, great ignition difficulty, serious energy loss, and serious blowby when the sealing plate sweeps over caused by the structure, that is, removing the ignition chamber brings the following advantages:

[0037] (1) Reduce energy loss and reduce the probability of blowby between adjacent cylinders;

[0038] (2) The compression ratio can also be improved without changing the other structures. The smaller the engine, the greater the improvement in compression ratio.

[0039] By moving the ignition point from inside the pilot chamber to the cylinder surface, the following advantages are achieved:

[0040] (1) Significantly shorten the flame propagation distance and reduce the possibility of detonation and flame quenching in small rotor engines;

[0041] (2) The spark directly contacts the compressed fresh mixture, greatly reducing the difficulty of ignition;

[0042] (3) Multi-point ignition is achieved by using only one spark plug, further shortening the flame propagation distance. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0044] Figure 1 It is a spark plug ignition device for traditional small rotary engines.

[0045] Figure 2 This is a schematic diagram of a small rotary engine cylinder surface spark plug ignition device disclosed in this embodiment.

[0046] Figure 3 This is a schematic diagram of the three-dimensional structure of the modified spark plug disclosed in this embodiment.

[0047] Figure 4 This is a schematic diagram of the structure of the bushing and groove on the cylinder surface disclosed in this embodiment.

[0048] Among them: 1-engine cylinder; 2-first working room; 3-second working room ( Figure 1 、 2 =Combustion chamber at the moment); 4-triangular rotor; 5-ordinary spark plug; 6-spark plug channel; 7-ignition chamber; 8-sealing plate; 9-third working chamber; 10-modified spark plug; 11-ceramic bushing; 12-copper conductor; 13-copper conductor anode 1; 14-copper conductor anode 2; 15-groove; 16-modified spark plug anode. DETAILED DESCRIPTION

[0049] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0050] Example 1

[0051] This embodiment discloses a small rotary engine cylinder surface spark plug ignition device, comprising a first working chamber, a second working chamber, a triangular rotor, a conventional spark plug, a spark plug channel, an ignition chamber, a sealing plate, and a third working chamber. It also includes an engine cylinder, a modified spark plug, a copper conductor, copper conductor anode 1, copper conductor anode 2, a bushing, and a groove.

[0052] The bushing is made of an insulating, high-temperature resistant material. The modified spark plug has its original L-shaped cathode structure removed. A copper conductor mounting hole and slot structure is installed on the engine cylinder to accommodate the mounting structure requirements of the modified spark plug and the copper conductor. The overall mounting hole depth is increased. Furthermore, the engine cylinder, serving as the cathode of the modified spark plug in this invention, must be made of a highly conductive metal material.

[0053] The modified spark plug is installed in the engine cylinder. The modified spark plug installation position must ensure that the copper conductor anodes 1 and 2 are close to the engine cylinder surface. The proximity of the copper conductor anodes 1 and 2 to the engine cylinder surface must ensure that the copper conductor anodes 1 and 2 are insulated from the spark plug channel located in the engine cylinder by the bushing, while being connected to the spark plug channel through the air through the groove in the bushing. When ignition is required, the air is broken through, and ignition is generated between the copper conductor anodes 1 and 2 and the spark plug channel. The proximity of the copper conductor anodes 1 and 2 to the engine cylinder surface must also ensure that the volume of the spark plug channel connecting to the combustion chamber is minimized. The bushing wraps the copper conductor, exposing only the grooves at both ends of the copper conductor and the part in contact with the modified spark plug anode. The bushing is installed inside the engine cylinder together with the modified spark plug and the copper conductor, and is used to isolate the combustion chamber and the ignition chamber, and insulate the copper conductor anode 1 and the copper conductor anode 2 from the engine cylinder. By insulating the modified spark plug anode from the engine cylinder, the copper conductor and the engine cylinder are prevented from directly igniting at any position, and the specific position of the groove opened on the bushing can be used to control the copper conductor anode 1 and the copper conductor anode 2 and the spark plug channel on the engine cylinder to ignite at a designated location; the cathode of the modified spark plug is the area in the spark plug channel of the engine cylinder corresponding to the groove on the bushing.

[0054] Example 2

[0055] This embodiment discloses a method for operating a small rotary engine cylinder surface spark plug ignition device. The engine cylinder is a fixed component in the small rotary engine that does not participate in the complex rotational motion. The engine cylinder and the triangular rotor radially divide the internal space of the engine cylinder into three independent working chambers. Each working chamber independently completes the four strokes of intake, compression, expansion, and exhaust. The triangular rotor performs a complex planetary motion within the engine cylinder, and the path swept by the three vertex angles is the engine cylinder profile. When the triangular rotor reaches the minimum volume in a certain working chamber, it is said to have reached compression top dead center and is called the combustion chamber. The position of the combustion chamber relative to the engine cylinder is fixed, but its position relative to the triangular rotor is not fixed. Each arc edge of the triangular rotor can enclose the engine cylinder to form a combustion chamber. The modified spark plug, bushing, and copper conductor are installed below the engine cylinder profile corresponding to the combustion chamber, sealing the existing ignition chamber structure below the profile. This reduces energy loss and the probability of blowby between adjacent cylinders. Furthermore, while the remaining structures remain unchanged, the compression ratio can be improved. The smaller the engine, the greater the compression ratio improvement. Copper anodes 1 and 2 are in close contact with the engine cylinder surface, directly exposed to the cylinder face. While insulated from the cylinder by a bushing, the grooves in the bushing ensure that the copper anodes 1 and 2 align with the spark plug passage in the engine cylinder at the desired location, meeting the basic requirements for ignition. During operation of the small rotary engine, at compression top dead center, the induction magnet mounted on the front counterweight triggers the Hall effect sensor. The rising edge of the Hall effect sensor signal then triggers the ignition coil, focusing energy on the modified spark plug anode. Simultaneously, copper anodes 1 and 2 pass through the grooves in the bushing and penetrate the air between the spark plug passage in the engine cylinder, generating an electric spark at the edge of the combustion chamber. The spark's location on the cylinder face significantly shortens the flame's propagation distance, reducing the likelihood of knock and flame quenching in the small rotary engine. The spark directly contacts the compressed fresh air mixture, significantly simplifying ignition. The spark is guided from copper anodes 1 and 2 into the engine cylinder and ultimately to ground.

[0056] In order to ensure insulation between the copper conductor anodes 1 and 2 and the engine cylinder, and to ensure that the bushing can be exposed to high-temperature and high-pressure fuel gas for a long time without failure, it is preferred that the bushing material is ceramic.

[0057] In order to ensure smooth ignition between the cylinder surface and the copper conductor anodes 1 and 2, preferably, the optimal side length difference between the bushing and the copper conductor anodes 1 and 2 is 0.2 mm.

[0058] In order to ensure smooth ignition between the spark plug channel and the copper conductor anodes 1 and 2 without causing excessive gas leakage when the sealing sheet sweeps across the groove on the bushing, the area of ​​the groove should preferably be less than 0.15 mm2.

[0059] Example 3 (combined Figure 1-4 )

[0060] Figure 1 The conventional small rotary engine spark plug ignition device shown is Figure 2 The spark plug ignition device and method for the combustion chamber of a small rotary engine shown in the figure are compared. The spark plug ignition devices of the two devices have the same structure: engine cylinder 1, first working chamber 2, second working chamber ( Figure 1 、 2 The combustion chamber at the moment) 3, triangular rotor 4, spark plug channel 6, sealing plate 8, third working chamber 9, these structures are the basic structure of a small rotary engine. Figure 1 The ordinary spark plug 5 and the ignition chamber 7 are structures unique to the spark plug ignition device of the traditional small rotary engine; Figure 2 The modified spark plug 10, bushing 11 and copper conductor 12 are structures unique to the spark plug cylinder surface ignition device and method for a small rotary engine combustion chamber disclosed in this embodiment.

[0061] The modified spark plug 10 is installed on the engine cylinder 1. The installation position of the modified spark plug 10 must ensure that the modified spark plug anode 16 is in close contact with the copper conductor 12. The modified spark plug anode 16 and the copper conductor are in close contact with each other to ensure that the modified spark plug anode 16 and the copper conductor 12 are at the same voltage level. The copper conductor 12 can be connected to the cylinder surface of the cylinder 1 through the gap on the bushing 11 through the air. When ignition is required, it can break through the air and ignite between the modified spark plug anode 16 and the cylinder surface. In this embodiment, the bushing 11 is made of ceramic material, and the copper conductor 12 on the bushing 11 is made of a square concave bend with a side length of 1.6mm to achieve dual-point ignition. The difference in side length between the bushing 11 and the copper conductor cross section is 0.2mm. The copper conductor 12 is close to the surface of the engine cylinder 1 and the distance between the copper conductor anode 1 (13) and the copper conductor anode 2 (14) and the combustion chamber 3 must be ensured to the maximum extent to avoid interference during engine operation. Ceramic bushing 11 is mounted over copper conductor 12 and over the anode of modified spark plug 10. Together with modified spark plug 10, it is installed inside engine cylinder 1, insulating copper conductor 12 from engine cylinder 1. This insulation prevents direct current flow between copper conductor 12 and engine cylinder 1, which could cause a loss of ignition capability. The anode of modified spark plug 10 extends through the copper conductor at both ends, while the cathode is located on the cylinder surface of engine cylinder 1, where groove 15 corresponds to the notch in ceramic bushing 11.

[0062] This embodiment discloses a working method of a spark plug ignition device on the cylinder surface of a small rotor engine: the engine cylinder 1 is a fixed part in the small rotor engine that does not participate in the complex rotational motion. The engine cylinder 1 and the triangular rotor 4 radially divide the internal space of the engine cylinder 1 into three independent working chambers, and each working chamber independently completes the four strokes of intake, compression, expansion work, and exhaust. The triangular rotor 4 performs a complex planetary motion in the engine cylinder 1, and the path swept by the three vertex angles is the engine cylinder 1 profile. When the triangular rotor 4 moves to a certain working chamber and reaches the minimum volume, the working chamber is said to have reached the top dead center of compression, and the working chamber is called the combustion chamber 3. The position of the combustion chamber 3 relative to the engine cylinder 1 is fixed, and the position of the combustion chamber 3 relative to the triangular rotor 4 is not fixed. Each arc edge of the triangular rotor 4 can enclose the combustion chamber 3 with the engine cylinder 1. The modified spark plug 10 and ceramic bushing 11 are installed under the surface of the engine cylinder 1 corresponding to the combustion chamber 3, and the original ignition chamber 7 structure under the closed surface is removed to reduce energy loss and the probability of blowby between adjacent cylinders. Moreover, the compression ratio can be improved without changing the other structures. The smaller the engine, the greater the increase in compression ratio. The modified spark plug anode 16 is in direct contact with the copper conductor. The copper conductor, which serves as the spark plug anode, extends at both ends close to the surface of the engine cylinder 1 and is directly exposed to the edge of the combustion chamber 3. The copper conductor is insulated from the engine cylinder 1 by the ceramic bushing 11, but the notch on the ceramic bushing 11 enables the copper conductor 12 and the groove 15 on the engine cylinder 1 to meet the basic requirements of ignition at the designated position. During operation of the small rotary engine, at compression top dead center, the induction magnet mounted on the front counterweight triggers the Hall effect sensor. The rising edge of the Hall effect sensor signal then triggers the ignition coil, focusing energy at the anode of the modified spark plug 16. Simultaneously, the modified spark plug anode 16 penetrates the air between the copper conductor 12 reserved in the ceramic bushing 11 and the groove 15 in the engine cylinder 1, generating an electric spark at the edge of the combustion chamber 3. The location of the electric spark at the edge of the combustion chamber 3 significantly shortens the flame propagation distance, reducing the possibility of detonation and flame quenching in the small rotary engine. The electric spark directly contacts the compressed fresh air-fuel mixture, greatly reducing the difficulty of ignition. The spark is guided from the modified spark plug anode 16 to the copper conductor 12, then to the engine cylinder 1, and finally to the ground.

[0063] In summary, the present invention discloses a spark plug cylinder surface ignition device and method for a small rotary engine combustion chamber, and provides a spark plug ignition device and method that does not require an ignition chamber, that is, direct ignition is performed on the cylinder surface of the small rotary engine combustion chamber, so that the position of the spark plug ignition is improved from the inside of the ignition chamber to the cylinder surface, thereby eliminating the structure of the ignition chamber and the spark plug channel, avoiding the problems caused by the structure such as long flame propagation distance, great ignition difficulty, serious energy loss, and serious blowby when the sealing plate sweeps over.

[0064] Under normal operation, a portion of the compressed combustible mixture within the combustion chamber is forced into the pilot chamber through the spark plug passage. After ignition by the glow plug / spark plug, a flame is generated, which then ignites the mixture within the combustion chamber again through the spark plug passage. The presence of the pilot chamber inevitably increases the flame propagation distance and airflow losses. The present invention discloses a spark plug cylinder surface ignition device and method for a small rotary engine combustion chamber. By eliminating the pilot chamber, this device reduces the flame propagation distance, reduces airflow losses, and improves the overall performance of the small rotary engine.

[0065] The compression ratio of a small rotary engine is the ratio of the maximum working chamber volume to the total gas volume at top dead center of compression. In traditional small rotary engines, the total gas volume at top dead center of compression includes the combustion chamber volume, the spark plug passage volume, and the ignition chamber volume. The present invention discloses a small rotary engine combustion chamber spark plug cylinder surface ignition device and method. By removing the ignition chamber, the total gas volume at top dead center of compression is the combustion chamber volume, excluding the spark plug passage volume and the ignition chamber volume. This improves the compression ratio while maintaining the remaining structural integrity. Smaller engines achieve greater improvements in compression ratio.

[0066] Because traditional small rotary engines have two structures, the ignition chamber, when a sealing plate at the top corner of the triangular rotor sweeps across the spark plug channel, it will connect the working chambers on both sides of the triangular rotor's top corner in a relatively short period of time. One side is in the middle of the intake stroke, and the other side is in the middle of the power stroke. The pressure difference between the two sides is huge, which will cause a large amount of blowby. The present invention discloses a small rotary engine combustion chamber spark plug cylinder surface ignition device and method. The ignition chamber is removed. When the sealing plate sweeps across the anode, the gap that can leak gas is reduced from the entire ignition chamber to a tiny fitting gap between the copper conductor anode 1, copper conductor anode 2 and bushing and the engine cylinder profile, thereby effectively reducing the amount of blowby between two adjacent cylinders when the sealing plate sweeps across the spark plug channel, helping to reduce the power loss of the small rotary engine.

[0067] During the combustion process of a traditional small rotary engine, the combustible mixture is ignited inside the ignition chamber and then transmitted into the combustion chamber through the spark plug channel. This will inevitably leave a certain amount of exhaust gas remaining in the ignition chamber at the end of combustion and unable to be discharged. The pressure of this residual exhaust gas is higher than the intake pressure, and a portion of it will be discharged into the combustion chamber during the intake process of the next cylinder, causing the spark plug to be filled with exhaust gas from the previous cycle, affecting the ignition effect. The present invention discloses a small rotary engine combustion chamber spark plug cylinder surface ignition device and method. By improving the ignition position from the inside of the ignition chamber to the cylinder surface, the spark directly contacts the compressed fresh mixture, without the influence of exhaust gas, and the difficulty of ignition is greatly reduced.

[0068] The present invention discloses a spark plug cylinder surface ignition device and method for a small rotary engine combustion chamber. By improving the ignition position from the interior of the ignition chamber to the cylinder surface, the flame propagation distance can be greatly shortened, and the possibility of detonation and flame quenching of the small rotary engine can be reduced.

[0069] The present invention discloses a spark plug cylinder surface ignition device and method for a small rotary engine combustion chamber. Copper conductor anodes 1 and 2 can maintain a very high temperature, which helps to improve the self-cleaning property of the spark plug and is not prone to carbon deposits.

[0070] Please note that the technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification. The above embodiments only express several implementation methods of the present application. The description is relatively specific and detailed, but it cannot be understood as a limitation on the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, without departing from the concept of this application, several variations and improvements can be made, which all fall within the scope of protection of this application. Therefore, the scope of protection of the patent in this application shall be based on the attached claims.

Claims

1. A spark plug cylinder ignition device for a small rotary engine combustion chamber, characterized in that: The device comprises: a first working chamber (2), a second working chamber (3), a triangular rotor (4), an ordinary spark plug (5), a spark plug channel (6), an ignition chamber (7), a sealing plate (8), and a third working chamber (9); and further comprises: an engine cylinder (1), a modified spark plug (10), a modified spark plug anode (13), a ceramic bushing (11), and a copper conductor (12); wherein: The ceramic bushing (11) is made of insulating and high-temperature resistant material; The spark plug (10) is modified by removing its own L-shaped cathode structure and making close contact with the anode; The ceramic bushing (11) wraps the copper conductor (12), exposing only the two ends of the copper conductor (12) and the portion in contact with the anode of the modified spark plug (10). The two ends of the copper conductor (12) serve as new anodes, namely, copper conductor anode 1 (13) and copper conductor anode 2 (14). The spark plug (10) is modified to divide the ignition energy into two parts, which are released at the copper conductor anode 1 (13) and the copper conductor anode 2 (14) respectively, and an igniter is used in conjunction with the spark plug; A modified spark plug (10), a copper conductor (12), and a ceramic bushing (11) are installed on an engine cylinder (1), adapted to the structure and installation requirements of the modified spark plug (10), the copper conductor (12), and the bushing (11), and a modified spark plug (10), the copper conductor (12), and the bushing (11) are installed at the bottom of the cylinder, while leaving space for loading and unloading the modified spark plug (10), the copper conductor (12), and the bushing (11); The engine cylinder (1) serves as the cathode of the modified spark plug (10) and is made of metal material.

2. A small rotary engine combustion chamber spark plug cylinder surface ignition device according to claim 1, characterized in that: The modified spark plug (10), the copper conductor (12), and the bushing (11) are installed on the engine cylinder (1). The installation position of the copper conductor (12) makes the copper conductor anode 1 (13) and the copper conductor anode 2 (14) close to the surface of the engine cylinder (1). The copper conductor anode 1 (13) and the copper conductor anode 2 (14) are close to the surface of the engine cylinder (1). The copper conductor anode 1 (13) and the copper conductor anode 2 (14) are insulated from the cylinder surface on the engine cylinder (1) by the bushing (11). The copper conductor anode is connected to the copper conductor anode through the groove (15) on the ceramic bushing (11). Then, the air is broken through at the ignition moment, and ignition is performed between the copper conductor anode 1 (13) and the copper conductor anode 2 (14) and the cylinder surface. The copper conductor anode 1 (13) and the copper conductor anode 2 (14) are close to the cylinder surface of the engine cylinder (1) so that the volume of the top of the copper conductor (12) connected to the combustion chamber (3) is minimized.

3. A small rotary engine combustion chamber spark plug cylinder surface ignition device according to claim 2, characterized in that: The ceramic bushing (11) wraps the copper conductor (12), exposing only the two ends of the copper conductor (12) and the portion in contact with the anode of the modified spark plug (10). The ceramic bushing (11) is installed together with the modified spark plug (10) and the copper conductor (12) inside the engine cylinder (1), and the copper conductor anode 1 (13) and the copper conductor anode 2 (14) are insulated from the engine cylinder (1). By insulating the copper conductor (12) from the engine cylinder (1), direct current is prevented between the copper conductor (12) and the engine cylinder (1), and ignition is then achieved through the position of the groove (15) provided on the bushing (11); the cathode of the modified spark plug (10) is the area corresponding to the groove (15) on the cylinder surface bushing (11) of the engine cylinder (1).

4. A small rotary engine combustion chamber spark plug cylinder surface ignition device according to claim 3, characterized in that: The copper conductor anode 1 (13), the copper conductor anode 2 (14) and the engine cylinder (1) are insulated, and the ceramic bushing (11) is exposed to high-temperature and high-pressure combustion gas for a long time without failure.

5. A small rotary engine combustion chamber spark plug cylinder surface ignition device according to claim 4, characterized in that: The side length difference between the bushing (11) and the copper conductor anode 1 (13) and the copper conductor anode 2 (14) is 0.2 mm to 0.5 mm, so that the cylinder surface of the cylinder (1) and the copper conductor anode 1 (13) and the copper conductor anode 2 (14) can successfully ignite.

6. A small rotary engine combustion chamber spark plug cylinder surface ignition device according to claim 5, characterized in that: The area of ​​the groove (15) is less than 0.15mm 2 , so that the ignition between the cylinder surface of the cylinder (1) and the copper conductor anode 1 (13) and the copper conductor anode 2 (14) is successful, and no gas leakage is generated when the sealing sheet (8) sweeps across the groove (15) on the bushing (11).

7. A small rotary engine combustion chamber spark plug cylinder surface ignition device according to claim 6, characterized in that: The device is in working condition: The engine cylinder (1) is a fixed part in a small rotary engine that does not participate in complex rotational motion. The engine cylinder (1) and the triangular rotor (4) radially divide the internal space of the engine cylinder (1) into three independent working chambers, and each working chamber independently completes the four strokes of intake, compression, expansion, and exhaust. The triangular rotor (4) performs complex planetary motion in the engine cylinder (1), and the path swept by the three vertex angles is the profile of the engine cylinder (1); when the triangular rotor (4) moves to a certain working chamber and reaches the minimum volume, the working chamber reaches the compression top dead center, and the working chamber becomes the combustion chamber (3); The position of the combustion chamber (3) relative to the engine cylinder (1) is fixed, and the position of the combustion chamber (3) relative to the triangular rotor (4) is not fixed. Each arc edge of the triangular rotor (4) and the engine cylinder (1) enclose the combustion chamber (3); The modified spark plug (10), the copper conductor (12), and the ceramic bushing (11) are installed below the profile of the engine cylinder (1) corresponding to the combustion chamber (3), and an ignition chamber (7) structure is provided below the closed profile; The copper conductor anode 1 (13) and the copper conductor anode 2 (14) are close to the surface of the engine cylinder (1) and are directly exposed to the edge of the combustion chamber (3); the copper conductor anode 1 (13) and the copper conductor anode 2 (14) are insulated from the engine cylinder (1) by the ceramic bushing (11); the groove (15) structure in the ceramic bushing (11) enables the copper conductor anode 1 (13) and the copper conductor anode 2 (14) to meet the basic requirements of ignition at the designated position with the spark plug channel (6) on the engine cylinder (1); During the operation of a small rotary engine, at the moment of compression top dead center, the induction magnet installed on the front balance weight triggers the Hall sensor, and then the rising edge of the Hall sensor signal triggers the ignition coil, gathering energy at the anode of the modified spark plug (10). At the same time, the copper conductor anode 1 (13) and the copper conductor anode 2 (14) pass through the groove (15) reserved in the bushing (11) and penetrate the air between the spark plug channel (6) on the engine cylinder (1), generating an electric spark at the edge of the combustion chamber (3); the position of the electric spark is the edge of the combustion chamber (3); the electric spark directly contacts the compressed fresh mixture; the spark is guided by the copper conductor anode 1 (13) and the copper conductor anode 2 (14) to the engine cylinder (1) and finally to the ground.

8. A method for igniting the cylinder surface of a spark plug in a combustion chamber of a small rotary engine, characterized in that: The method uses a small rotary engine combustion chamber spark plug cylinder surface ignition device to achieve ignition; wherein: The device comprises: a first working chamber (2), a second working chamber (3), a triangular rotor (4), an ordinary spark plug (5), a spark plug channel (6), an ignition chamber (7), a sealing plate (8), a third working chamber (9), an engine cylinder (1), a modified spark plug (10), a modified spark plug anode (13), a ceramic bushing (11), and a copper conductor (12); The method comprises: The engine cylinder (1) is a fixed part in a small rotary engine that does not participate in complex rotational motion. The engine cylinder (1) and the triangular rotor (4) radially divide the internal space of the engine cylinder (1) into three independent working chambers, and each working chamber independently completes the four strokes of intake, compression, expansion, and exhaust. The triangular rotor (4) performs complex planetary motion in the engine cylinder (1), and the path swept by the three vertex angles is the profile of the engine cylinder (1); when the triangular rotor (4) moves to a certain working chamber and reaches the minimum volume, the working chamber reaches the compression top dead center, and the working chamber becomes the combustion chamber (3); The position of the combustion chamber (3) relative to the engine cylinder (1) is fixed, and the position of the combustion chamber (3) relative to the triangular rotor (4) is not fixed. Each arc edge of the triangular rotor (4) and the engine cylinder (1) enclose the combustion chamber (3); The modified spark plug (10), the copper conductor (12), and the ceramic bushing (11) are installed below the profile of the engine cylinder (1) corresponding to the combustion chamber (3), and an ignition chamber (7) structure is provided below the closed profile; The copper conductor anode 1 (13) and the copper conductor anode 2 (14) are close to the surface of the engine cylinder (1) and are directly exposed to the edge of the combustion chamber (3); the copper conductor anode 1 (13) and the copper conductor anode 2 (14) are insulated from the engine cylinder (1) by the ceramic bushing (11); the groove (15) structure in the ceramic bushing (11) enables the copper conductor anode 1 (13) and the copper conductor anode 2 (14) to meet the basic requirements of ignition at the designated position with the spark plug channel (6) on the engine cylinder (1); During the operation of the small rotary engine, at the moment of compression top dead center, the induction magnet installed on the front balance weight triggers the Hall sensor, and then the rising edge of the Hall sensor signal triggers the ignition coil, which gathers energy at the anode of the modified spark plug (10). At the same time, the copper conductor anode 1 (13) and the copper conductor anode 2 (14) pass through the groove (15) reserved in the bushing (11) and break through the air between the spark plug channel (6) on the engine cylinder (1), generating electric sparks at the edge of the combustion chamber (3); The spark is located at the edge of the combustion chamber (3); the spark directly contacts the compressed fresh air mixture; The spark is guided from the copper conductor anode 1 (13) and the copper conductor anode 2 (14) to the engine cylinder (1) and finally to the earth.

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