Variable frequency pulse jet device

Abstract

The application provides a variable frequency pulse injection device, which comprises a cylinder body with a through hole in the middle, an oil inlet pipeline and an oil outlet pipeline are arranged in the cylinder body, the inner diameter of the oil inlet pipeline is larger than that of the oil outlet pipeline, a nozzle assembly is arranged at the outlet of the oil outlet pipeline, the cylinder body further comprises a rotating shaft cavity which is perpendicular to the axis of the cylinder body, a rotating shaft which is rotatably connected to the cylinder body through a ball bearing is arranged in the rotating shaft cavity, the rotating shaft comprises a long shaft section which extends outward from the cylinder body and a short shaft section which is located in the cylinder body, two first elliptical cavity blocks and second elliptical cavity blocks which are consistent in shape and left-right symmetrical are arranged in the middle of the rotating shaft, and the first elliptical cavity blocks and the second elliptical cavity blocks are combined to form an elliptical cavity after installation. Advantageous effects: the combination of the specially designed rotating shaft and the cylinder body is used to control the change of the rotating speed of the rotating shaft and the change of the pulse injection frequency, the characteristics of the servo motor, such as accurate speed control and fast response speed, are utilized, and the response speed of the frequency change of the injection device is improved.

Description

Technical Field

[0001] This invention relates to the field of engine fuel injector technology, and more specifically to a variable frequency pulse injection device. Background Technology

[0002] In the current aviation industry, scramjet engines, as a highly efficient and high-thrust power system, have received widespread attention. However, the pulse injection system, as a core component of scramjet engines, still faces a series of technical challenges that limit the overall system's performance improvement.

[0003] As a key component of the combustion control system of a scramjet engine, the pulse injection device plays a crucial role in precisely injecting fuel to achieve a highly efficient combustion process. Traditional pulse injection devices have limitations in terms of liquid fuel injection speed, spray uniformity, and response speed. Mechanical pulse injection devices, due to their complex structure, are difficult to adjust injection parameters quickly, resulting in poor adaptability to dynamic operating environments. While electromagnetic and piezoelectric pulse injection devices improve response speed to some extent, they are still constrained by high-power power supplies and structural durability, limiting their widespread use in practical applications. Currently, injection device designs mainly employ circular nozzles, evenly distributed on the nozzle head, and can be single or multiple. Because the nozzles spray along the axis, the fuel mist disperses in a cone shape, resulting in uneven fuel mist distribution between the nozzles, with some areas showing significantly reduced fuel mist volume. This leads to reduced mixing, decreasing the degree of thorough mixing between air and fuel, and consequently affecting combustion efficiency.

[0004] Currently, pulse injection devices suffer from poor stability, failing to consistently provide precise fuel injection volumes. Secondly, their response speed is slow, unable to adjust injection parameters in real time to adapt to rapidly changing working environments. Furthermore, poor nozzle layout and shape design result in suboptimal fuel atomization, affecting the thorough mixing of fuel and air. Summary of the Invention

[0005] Purpose of the invention: To address the shortcomings of existing technologies, this invention provides a variable frequency pulse injection device. Through the combination of a specially designed rotating shaft and cylinder, the pulse injection frequency is controlled by varying the rotational speed of the rotating shaft. The elliptical cavity is designed with an elliptical cross-sectional shape, which reduces disturbances during fluid flow, lowers the inertial force during fluid flow, reduces the generation of eddies, reduces the effect of inertial force, and reduces the impact of water hammer, making the fluid flow in the pipeline more stable and improving the stability of the pulse injection device.

[0006] Technical Solution: A variable frequency pulse injection device includes a cylinder body with a central through-hole. The cylinder body includes an oil inlet pipe and an oil outlet pipe. The inner diameter of the oil inlet pipe is larger than the inner diameter of the oil outlet pipe. A nozzle assembly is disposed at the outlet of the oil outlet pipe. The cylinder body also includes a rotating shaft cavity perpendicular to the cylinder body axis. A rotating shaft is disposed within the rotating shaft cavity and rotatably connected to the cylinder body via a ball bearing. The rotating shaft includes a long shaft section extending outward from the cylinder body and a short shaft section located within the cylinder body. The end of the long shaft section away from the short shaft section is connected to a driving device. The shaft is connected by two identical and symmetrical elliptical cavity blocks, a first elliptical cavity block and a second elliptical cavity block, located at the middle of the major axis and minor axis sections, respectively. After installation, the first and second elliptical cavity blocks are combined to form an elliptical cavity. The intersection of the major axis and minor axis of the elliptical cavity coincides with the intersection of the cylinder axis and the axis of the shaft. The minor axis of the elliptical cross-section of the elliptical cavity is equal to the port diameter of the oil inlet pipe.

[0007] This invention combines a specially designed rotating shaft and cylinder body, controlling the rotational speed of the shaft to control the pulse injection frequency. Utilizing the precise speed control and fast response of a servo motor, the response speed of the injection device to frequency changes is improved. The elliptical cavity's cross-sectional shape reduces fluid flow disturbances, decreases inertial forces, reduces eddy currents, and mitigates the effects of water hammer, resulting in more stable fluid flow in the pipeline and improved stability of the pulse injection device.

[0008] In a preferred embodiment, in order to achieve stable installation of the rotating shaft and improve the response speed of the device, end caps and bushings are provided on both sides of the rotating shaft cavity. The long shaft section and the short shaft section are positioned by the end caps and bushings on both sides, respectively. The long bushing extends outward from the cylinder body through one end cap and connects to the drive device.

[0009] The drive unit uses a servo motor, which drives the rotating shaft to periodically connect the elliptical cavity with the fuel inlet and outlet lines, achieving pulse injection. Utilizing the precise speed control and fast response of the servo motor, the injection frequency of the injection device is rapidly adjusted by changing the shaft speed to meet the requirements of different operating conditions. The power output of the scramjet engine is affected by the fuel supply; rapidly adjusting the pulse frequency allows for real-time adjustment of the fuel injection quantity. By increasing or decreasing the pulse injection frequency, the fuel injection quantity is adjusted to control the engine's power output. When the load increases or rapid acceleration is required, the pulse frequency is increased to increase the fuel injection quantity and provide more power; when the load decreases or deceleration is required, the pulse frequency is decreased to reduce the fuel supply. The servo motor adjusts the shaft speed, thus rapidly adjusting the injection frequency of the injection device and improving its response speed.

[0010] In a preferred embodiment, to improve the sealing effect of the fuel passage, a first sealing sleeve and a second sealing sleeve are respectively provided between the long shaft section and the short shaft section near the first elliptical cavity block and between the second elliptical cavity block and the cylinder block. The long shaft section, the first sealing sleeve and the first elliptical cavity block are fixedly connected as a whole by screws, and the short shaft section, the second sealing sleeve and the second elliptical cavity block are fixedly connected as a whole by screws. The long shaft section, the first sealing sleeve, the first elliptical cavity block, the second elliptical cavity block, the short shaft section and the second sealing sleeve each have at least two corresponding bolt through holes and are fixedly connected as a whole by bolts.

[0011] By setting a first sealing sleeve and a second sealing sleeve, the sealing effect of the rotating and contacting parts is improved, the internal pressure of the fuel line is kept stable, and the pulse injection effect is further improved; the same-side structure is fastened into one piece with screws to improve the overall structural strength, thereby improving the operational stability of the device.

[0012] In a preferred embodiment, to further improve the atomization quality of the pulse injection device, the nozzle assembly includes a nozzle seat fixedly connected to the cylinder body and a fuel nozzle detachably connected to the nozzle seat. A sealing groove is provided at the connection between the nozzle seat and the cylinder body, and a sealing gasket is provided in the sealing groove. An injection through hole is provided in the fuel nozzle, and the cross-section of the injection through hole is elliptical. A metal wire mesh is provided between the fuel line of the nozzle seat and the injection through hole.

[0013] Compared to circular nozzles, elliptical nozzles offer advantages such as a larger spray cone angle, shorter jet breakup length, and higher oil-gas mixing quality, thus improving the atomization quality of the injection device. By using a metal wire mesh to divide large bubbles into several uniform and stable small bubbles, the average diameter of the atomized particles is reduced, thereby enhancing the atomization quality of liquid fuels.

[0014] In order to achieve stable pulse injection, the angle between the axis of the elliptical cavity and the axis of the first oil outlet pipeline is α;

[0015] When the area of ​​the channel connecting the elliptical cavity and the oil inlet pipe reaches its maximum for the first time during a single rotation of the rotating shaft, the angle between the axis of the elliptical cavity and the axis of the first oil outlet pipe is denoted as . , The calculation formula is as follows:

[0016]

[0017] In the formula, x is the diameter of the oil inlet of the elliptical cavity, d is the diameter of the port of the first oil outlet pipeline, and z is the distance from the intersection of the major and minor axes of the elliptical cross-section of the elliptical cavity to the oil inlet.

[0018] And maintain this state until the area of ​​the channel connecting the elliptical cavity to the oil inlet pipe decreases as the shaft continues to rotate. The angle between the axis of the elliptical cavity and the axis of the first oil outlet pipe is denoted as - ;

[0019] When the elliptical cavity rotates with the shaft until both ends are completely enclosed within the shaft cavity, the angle between the axis of the elliptical cavity and the axis of the first oil outlet pipe is _____. , The calculation formula is as follows:

[0020] =

[0021] In the formula, x is the diameter of the oil inlet of the elliptical cavity, d is the diameter of the port of the first oil outlet pipeline, and z is the distance from the intersection of the major and minor axes of the elliptical cross-section of the elliptical cavity to the oil inlet.

[0022] The oil flow angle of the pulse injection device is to The maximum oil flow angle is to ;

[0023] The ratio of fuel cut-off / fuel supply time within a cycle is .

[0024] The included angle α is adjusted by adjusting the port diameter of the first oil outlet pipe. By installing sleeves of different thicknesses on the first oil outlet pipe, the port diameter of the first oil outlet pipe can be adjusted, thereby adjusting the included angle α and realizing the adjustment of the ratio of oil flow time to closing time within one cycle.

[0025] In a preferred embodiment, to achieve a better sealing effect, both the first and second sealing sleeves are provided with sealing rings at the connection points with the cylinder body. The sealing rings are H-shaped and have a 45° chamfer along the cylinder body axis.

[0026] The sealing ring is installed with the chamfer facing the cylinder axis. When the H-shaped sealing ring rotates with the shaft, it tightly fits the sleeve due to centrifugal force, thus sealing the shaft cavity. One end of the H-shaped sealing ring has a chamfer, which can squeeze fuel into the cavity during rotation and reduce leakage to the space between the two ends of the H-shaped sealing ring. The chamfered sealing ring has a smaller contact area when it contacts the sleeve surface, which reduces frictional resistance during rotation, reduces wear of the sealing ring, and reduces energy loss. At the same time, it can reduce deformation or compression of the sealing ring during rotation, ensuring sealing effect and thus reducing leakage.

[0027] In a preferred embodiment, in order to achieve step-by-step sealing, the sealing ring on any side includes at least two sealing rings arranged side by side and equidistant from each other based on the height of the first sealing sleeve or the second sealing sleeve.

[0028] By setting at least two H-shaped sealing rings, leakage is reduced layer by layer, thereby sealing the shaft cavity.

[0029] In a preferred embodiment, to improve the stability of the pulse injection device, the oil outlet pipeline includes a first oil outlet pipeline and a second oil outlet pipeline. The inner diameter of the first oil outlet pipeline is larger than the inner diameter of the second oil outlet pipeline. The end of the first oil outlet pipeline near the oil inlet of the second oil outlet pipeline is set as a smooth arc surface.

[0030] The curved smooth connection provides a larger transition area, reducing turbulence and eddies in the flowing fuel, decreasing resistance and turbulence, lowering pressure loss, and improving fluid flow characteristics. When pressure changes occur suddenly within the pipeline, the curved connection can more effectively slow down the rate of pressure change and disperse the pressure effect over a wider area around the connection. Flowing fuel moves at high speeds within the pipeline; when the flow velocity suddenly changes or the fuel encounters an obstacle, pressure waves are generated, leading to water hammer. During water hammer, the curved pipeline geometry increases the pressure dispersion effect within the pipeline. When fuel impacts the pipeline wall, some energy is dispersed and buffered, reducing the impact on the pipeline, reducing pressure wave reflection and propagation, and lowering pressure loss in the pipeline system. The curved smooth connection optimizes fuel flow characteristics, reduces the impact of sudden pressure changes within the pipeline, minimizes water hammer, and improves the stability of the pulse injection device.

[0031] In a preferred embodiment, to improve the stability of the pulse injection device, the inner wall of the oil inlet pipe near the elliptical cavity is provided with an arc-shaped smooth structure, the port diameter of the oil inlet pipe near the elliptical cavity is larger than the port diameter of the elliptical cavity and equal to the minor axis length of the elliptical cross section of the elliptical cavity, and the port diameter of the first oil outlet pipe is 3mm~5mm smaller than the port diameter of the elliptical cavity.

[0032] Regarding the port diameter of the oil inlet pipe, the ratio of the length of the major axis to the minor axis of the elliptical cavity is 1 / 3. The elliptical cavity can buffer sudden pressure changes within the cavity, reducing pressure fluctuations, pressure shocks, and vibrations. The wall shape of the elliptical cavity allows for more uniform pressure distribution during pressure changes, reducing fluid resistance and turbulence, and minimizing pressure wave reflection and propagation within the cavity. When a sudden pressure change occurs within the cavity, the buffering effect helps reduce shocks and vibrations, improving fluid flow performance and enhancing the stability and reliability of the pulse injection device.

[0033] In a preferred embodiment, to improve the reliability of the pulse injection device, two shaft cavity sleeves corresponding to the positions of the long shaft section and the short shaft section are provided in the shaft cavity. The shaft cavity sleeves are interference-fitted with the cylinder body, and the ball bearing and sealing ring on either side are tightly fitted to the inner wall of the corresponding shaft cavity sleeve.

[0034] The use of wear-resistant alloy materials enables the shaft cavity sleeve to have high hardness and wear resistance, reducing friction loss and improving the sealing performance of the shaft cavity. The interference fit between the shaft cavity sleeve and the cylinder body ensures that the shaft cavity sleeve and the inner wall of the cylinder body are tightly fitted during assembly, reducing vibration during operation, lowering noise, reducing wear, improving the stability of pulse injection, and improving the reliability of the pulse injection device.

[0035] Beneficial Effects: This invention, through the combination of a specially designed rotating shaft and cylinder, controls the pulse injection frequency by varying the rotational speed of the shaft. Utilizing the precise speed control and fast response of a servo motor, the response speed of the injection device to frequency changes is improved. The oil inlet pipe is designed with a smooth, arc-shaped connection near the port, and the elliptical cavity has an elliptical cross-sectional shape. This reduces fluid flow disturbance, lowers inertial forces, reduces eddy currents, and minimizes the effects of inertial forces and water hammer, resulting in more stable fluid flow and improved stability of the pulse injection device.

[0036] The injection orifice is designed with an elliptical cross-section. The elliptical orifice offers advantages such as a larger spray cone angle, shorter jet breakup length, and higher fuel-air mixture quality, thereby improving fuel atomization quality. By installing sleeves of different thicknesses on the first fuel outlet line to adjust the port diameter, the included angle α is adjusted, thus regulating the ratio of fuel flow time to shut-off time within a cycle. This allows the pulse injection device to achieve different injection volumes under the same injection pressure.

[0037] By using specially designed sealing sleeves and sealing rings, and installing a shaft cavity sleeve made of wear-resistant alloy materials, frictional resistance during rotation is reduced, seal ring wear is decreased, deformation or compression of the seal ring during rotation is reduced, vibration during operation is reduced, noise is lowered, wear is reduced, the sealing performance of the shaft cavity is improved, the stability of pulse injection is enhanced, and the reliability of the pulse injection device is increased. Furthermore, by incorporating detachable nozzle seats and detachable fuel injectors, different cross-sectional shapes of fuel injectors can be used to produce different spray characteristics. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0040] Figure 2 This is a schematic diagram of the rotating shaft cavity of the present invention.

[0041] Figure 3 This is a schematic diagram of the rotating shaft of the present invention rotating 90°.

[0042] Figure 4 This is a schematic diagram showing the angle α between the axis of the elliptical cavity and the axis of the oil outlet pipeline of the present invention.

[0043] Figure 5 This is a schematic diagram of the sealing sleeve of the present invention. Detailed Implementation

[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0046] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0047] like Figure 1 As shown, a variable frequency pulse injection device includes a cylinder 1 with a central through-hole. The cylinder 1 includes an oil inlet pipe 2 and an oil outlet pipe 3. The inner diameter of the oil inlet pipe 2 is larger than the inner diameter of the oil outlet pipe 3. A nozzle assembly 4 is provided at the outlet of the oil outlet pipe 3. The cylinder 1 also includes a rotating shaft cavity 5 perpendicular to the axis of the cylinder 1. A rotating shaft 52, rotatably connected to the cylinder 1 via a ball bearing 51, is provided within the rotating shaft cavity 5. The rotating shaft 52 includes a long shaft section 521 extending outward from the cylinder 1 and a short shaft section 522 located within the cylinder 1. The end of the long shaft section 521 away from the short shaft section 522 is connected to a drive device. Two identical and symmetrical elliptical cavity blocks 523 and 524 are provided in the middle of the rotating shaft 52. The first elliptical cavity block 523 and the second elliptical cavity block 524 are respectively located at one end of the major axis section 521 and the minor axis section 522 near the middle of the rotating shaft 52. After the first elliptical cavity block 523 and the second elliptical cavity block 524 are installed, they are combined to form an elliptical cavity 525. The intersection of the major axis and the minor axis of the elliptical cavity 525 coincides with the intersection of the axis of the cylinder 1 and the axis of the rotating shaft 52. The minor axis length of the elliptical cross section of the elliptical cavity 525 is equal to the port diameter of the oil inlet pipe 2.

[0048] This invention combines a specially designed rotating shaft 52 and cylinder 1, controlling the rotational speed of the rotating shaft 52 to control the pulse injection frequency. Utilizing the precise speed control and fast response of the servo motor, the response speed of the injection device to frequency changes is improved. The elliptical cavity is designed with an elliptical cross-sectional shape, reducing disturbances during fluid flow, lowering inertial forces, reducing eddy currents, and minimizing the effects of inertial forces and water hammer, thus making the fluid flow in the pipeline more stable and improving the stability of the pulse injection device.

[0049] like Figures 1 to 3As shown, in order to achieve stable installation of the rotating shaft 52 and improve the response speed of the device, end caps 53 and bushings 54 are provided on both sides of the rotating shaft cavity 5. The long shaft section 521 and the short shaft section 522 are positioned by the end caps 53 and bushings 54 on both sides, respectively. The long shaft section 521 extends outward from the cylinder body 1 through one end cap 53 and connects to the drive device.

[0050] The drive unit uses a servo motor, which drives the rotating shaft 52 to rotate, thereby periodically connecting the elliptical cavity 525 with the fuel inlet and outlet lines to achieve pulse injection. Utilizing the precise speed control and fast response of the servo motor, the rotation speed of the rotating shaft 52 is adjusted to quickly adjust the fuel injection frequency of the injection device to meet the requirements under different operating conditions. The power output of the scramjet engine is affected by the fuel supply. Rapidly adjusting the pulse frequency can achieve real-time adjustment of the fuel injection quantity. By increasing or decreasing the pulse injection frequency, the fuel injection quantity is adjusted to control the engine's power output. When the load increases or rapid acceleration is required, the pulse frequency is increased to increase the fuel injection quantity to provide more power. When the load decreases or deceleration is required, the pulse frequency is decreased to reduce the fuel supply. By adjusting the rotation speed of the rotating shaft 52 through the servo motor, the fuel injection frequency of the injection device is quickly adjusted, improving the response speed of the injection device.

[0051] In a preferred embodiment, to improve the sealing effect of the fuel passage, a first sealing sleeve 55 and a second sealing sleeve 56 are respectively provided between the end of the long shaft section 521 and the end of the short shaft section 522 near the first elliptical cavity block 523 and the second elliptical cavity block 524 and the cylinder block 1. The long shaft section 521, the first sealing sleeve 55 and the first elliptical cavity block 523 are fixedly connected as a whole by screws, and the short shaft section 522, the second sealing sleeve 56 and the second elliptical cavity block 524 are fixedly connected as a whole by screws. The long shaft section 521, the first sealing sleeve 55, the first elliptical cavity block 523, the second elliptical cavity block 524, the short shaft section 522 and the second sealing sleeve 56 each have at least two corresponding bolt through holes and are fixedly connected as a whole by bolts.

[0052] By setting up a first sealing sleeve and a second sealing sleeve, the sealing effect of the rotating and contacting parts is improved, the internal pressure of the fuel line is kept stable, and the pulse injection effect is further improved; the same-side structure is fastened into one piece with screws to improve the overall structural strength, thereby improving the operational stability of the device.

[0053] like Figure 1As shown, in a preferred embodiment, to further improve the atomization quality of the pulse injection device, the nozzle assembly 4 includes a nozzle seat 41 fixedly connected to the cylinder body 1 and a fuel nozzle 42 detachably connected to the nozzle seat 41. A sealing groove is provided at the connection between the nozzle seat 41 and the cylinder body 1, and a sealing gasket is provided in the sealing groove. An injection through hole is provided in the fuel nozzle 42, and the cross-section of the injection through hole is elliptical. A metal wire mesh is provided between the fuel line of the nozzle seat 41 and the injection through hole.

[0054] Compared to circular nozzles, elliptical nozzles offer advantages such as a larger spray cone angle, shorter jet breakup length, and higher oil-gas mixing quality, thus improving the atomization quality of the injection device. By using a metal wire mesh to divide large bubbles into several uniform and stable small bubbles, the average diameter of the atomized particles is reduced, thereby enhancing the atomization quality of liquid fuels.

[0055] like Figure 5 As shown, in order to achieve stable pulse injection, the angle between the axis of the elliptical cavity 525 and the axis of the first oil outlet pipeline is α.

[0056] When the area of ​​the channel connecting the elliptical cavity 525 and the oil inlet pipe 2 reaches its maximum for the first time during a single rotation of the rotating shaft 52, the angle between the axis of the elliptical cavity 525 and the axis of the first oil outlet pipe is denoted as . , The calculation formula is as follows:

[0057]

[0058] In the formula, x is the diameter of the oil inlet of the elliptical cavity, d is the diameter of the port of the first oil outlet pipeline, and z is the distance from the intersection of the major and minor axes of the elliptical cross-section of the elliptical cavity to the oil inlet.

[0059] And maintain this state until the area of ​​the channel connecting the elliptical cavity 525 to the oil inlet pipe 2 decreases as the rotating shaft 52 continues to rotate. The angle between the axis of the elliptical cavity 525 and the axis of the first oil outlet pipe is denoted as - ;

[0060] When the elliptical cavity 525 rotates with the rotating shaft 52 until its two ends are completely closed within the shaft 52 cavity, the angle between the axis of the elliptical cavity 525 and the axis of the first oil outlet pipe is _____. , The calculation formula is as follows:

[0061] =

[0062] In the formula, x is the diameter of the oil inlet of the elliptical cavity, d is the diameter of the port of the first oil outlet pipeline, and z is the distance from the intersection of the major and minor axes of the elliptical cross-section of the elliptical cavity to the oil inlet.

[0063] The oil flow angle of the pulse injection device is to The maximum oil flow angle is to ;

[0064] The ratio of fuel cut-off / fuel supply time within a cycle is .

[0065] The included angle α is adjusted by adjusting the port diameter of the first oil outlet pipe. By installing sleeves of different thicknesses on the first oil outlet pipe, the port diameter of the first oil outlet pipe can be adjusted, thereby adjusting the included angle α and realizing the adjustment of the ratio of oil flow time to closing time within one cycle.

[0066] In this embodiment, to better control the oil injection volume of the pulse injection device, the port diameter of the first oil outlet pipe is set to d = 7mm, the oil inlet diameter of the elliptical cavity 525 is x = 10mm, the ratio of the length of the major axis to the minor axis of the elliptical cavity 52517 is 1 / 3, and the distance z from the intersection of the major and minor axes of the elliptical cross-section of the elliptical cavity 525 to the oil inlet is 12.7mm. When the elliptical cavity 525 rotates counterclockwise until the right extension line of the oil outlet port cross-section coincides with the right vertex of the port cross-section of the first oil outlet pipe 11, the angle between the axis of the elliptical cavity 525 and the axis of the first oil outlet pipe is... , The present invention =25.18°, when the elliptical cavity 525 rotates with the rotating shaft 52 until the ports at both ends are completely closed in the cavity of the rotating shaft 52, the angle α between the axis of the elliptical cavity 525 and the axis of the first oil outlet pipe is 25.18°. , = The present invention =36.87°. When the elliptical cavity 525 rotates counterclockwise to an angle of -36.87°, fuel begins to enter the first oil outlet pipe from the elliptical cavity 525. When the elliptical cavity 525 rotates counterclockwise to an angle of -25.18°, the oil inlet of the elliptical cavity 525 completely covers the port of the first oil outlet pipe, at which point the oil flow is at its maximum, continuing until the angle of α is 25.18°. Subsequently, the oil flow gradually decreases. When the elliptical cavity 525 rotates counterclockwise to an angle of α of 36.87°, the oil inlet of the elliptical cavity 525 is completely closed in the cavity of the rotating shaft 52. Sleeves of different thicknesses are installed in the first oil outlet pipe to adjust the port diameter of the first oil outlet pipe, thereby adjusting the included angle α, realizing the adjustment of the ratio of oil flow time to closing time within one cycle, and thus adjusting the injection quantity of pulse injection.

[0067] like Figure 4 As shown, in order to achieve a better sealing effect, sealing rings 57 are provided at the connection between the first sealing sleeve 55 and the second sealing sleeve 56 and the cylinder body 1. The sealing rings 57 are H-shaped and have a 45° chamfer in the direction of the cylinder body 1 axis.

[0068] The sealing ring 57 is installed with the chamfer facing the axis of the cylinder block 1. When the H-shaped sealing ring 57 rotates with the rotating shaft 52, it tightly fits the sleeve due to centrifugal force, thus sealing the rotating shaft cavity 5. One end of the H-shaped sealing ring 57 has a chamfer, which can squeeze fuel into the cavity during rotation and reduce leakage to the space between the two ends of the H-shaped sealing ring 57. The chamfered sealing ring 57 has a smaller contact area when it contacts the sleeve surface, which reduces the frictional resistance during rotation, reduces the wear of the sealing ring 57, and reduces energy loss. At the same time, it can reduce the deformation or compression phenomenon of the sealing ring 57 during rotation, ensuring the sealing effect and thus reducing leakage.

[0069] To achieve step-by-step sealing, the sealing ring 57 on any side includes at least two sealing rings 57 arranged side by side and distributed at equal distances based on the height of the first sealing sleeve 55 or the second sealing sleeve 56.

[0070] By setting at least two H-shaped sealing rings 57, leakage is gradually reduced, thereby sealing the cavity of the rotating shaft 52. In this embodiment, the H-shaped sealing rings are set as three equally spaced sealing rings, respectively placed at 1 / 4, 1 / 2, and 3 / 4 of the height of the first sealing sleeve.

[0071] To improve the stability of the pulse injection device, the oil outlet line 3 includes a first oil outlet line and a second oil outlet line. The inner diameter of the first oil outlet line is larger than the inner diameter of the second oil outlet line. The end of the first oil outlet line near the second oil outlet line is set as a smooth arc surface for the oil inlet of the second oil outlet line.

[0072] The curved smooth connection provides a larger transition area, reducing turbulence and eddies in the flowing fuel, decreasing resistance and turbulence, lowering pressure loss, and improving fluid flow characteristics. When pressure changes occur suddenly within the pipeline, the curved connection can more effectively slow down the rate of pressure change and disperse the pressure effect over a wider area around the connection. Flowing fuel moves at high speeds within the pipeline; when the flow velocity suddenly changes or the fuel encounters an obstacle, pressure waves are generated, leading to water hammer. During water hammer, the curved pipeline geometry increases the pressure dispersion effect within the pipeline. When fuel impacts the pipeline wall, some energy is dispersed and buffered, reducing the impact on the pipeline, reducing pressure wave reflection and propagation, and lowering pressure loss in the pipeline system. The curved smooth connection optimizes fuel flow characteristics, reduces the impact of sudden pressure changes within the pipeline, minimizes water hammer, and improves the stability of the pulse injection device.

[0073] To improve the stability of the pulse injection device, the inner wall of the oil inlet pipe 2 near the elliptical cavity 525 is provided with an arc-shaped smooth structure. The diameter of the port of the oil inlet pipe 2 near the elliptical cavity 525 is larger than the port diameter of the elliptical cavity 525 and equal to the minor axis length of the elliptical cross section of the elliptical cavity 525. The port diameter of the first oil outlet pipe is 3mm to 5mm smaller than the port diameter of the elliptical cavity 525. In this embodiment, the length ratio of the major axis to the minor axis of the elliptical cavity 525 is 1 / 3.

[0074] Regarding the port diameter of the oil inlet pipe 2, the ratio of the length of the major axis to the minor axis of the elliptical cavity 525 is 1 / 3. The elliptical cavity can buffer pressure changes during sudden pressure shifts, reducing pressure shocks and vibrations. The wall shape of the elliptical cavity allows for more uniform pressure distribution during pressure changes, reducing fluid resistance and turbulence, and minimizing pressure wave reflection and propagation within the cavity. When a sudden pressure change occurs inside the cavity, the buffering effect helps reduce shocks and vibrations, improving fluid flow performance and enhancing the stability and reliability of the pulse injection device.

[0075] To improve the reliability of the pulse injection device, two shaft sleeves 58 are provided inside the shaft 52 cavity, corresponding to the positions of the long shaft section 521 and the short shaft section 522. The shaft sleeves 58 are interference-fitted with the cylinder body 1, and the ball bearing 51 and the sealing ring 57 on either side are tightly fitted to the inner wall of the corresponding shaft sleeve 58.

[0076] The use of wear-resistant alloy materials enables the shaft cavity sleeve 58 to have high hardness and wear resistance, reduce friction loss, improve the sealing performance of the shaft 52 cavity, and ensure that the shaft cavity sleeve 58 and the cylinder body 1 are tightly fitted during assembly, thereby reducing vibration, noise, and wear during operation, improving the stability of pulse injection, and enhancing the reliability of the pulse injection device.

[0077] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0078] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A variable frequency pulse injection device, comprising a cylinder (1) with a central through-hole, wherein the cylinder (1) includes an oil inlet pipe (2) and an oil outlet pipe (3), wherein the inner diameter of the oil inlet pipe (2) is larger than the inner diameter of the oil outlet pipe (3), and a nozzle assembly (4) is provided at the outlet of the oil outlet pipe (3), characterized in that: The cylinder (1) also includes a rotating shaft cavity (5) perpendicular to the axis of the cylinder (1). The rotating shaft cavity (5) is provided with a rotating shaft (52) rotatably connected to the cylinder (1) via a ball bearing (51). The rotating shaft (52) includes a long shaft section (521) extending outward from the cylinder (1) and a short shaft section (522) located inside the cylinder (1). The end of the long shaft section (521) away from the short shaft section (522) is connected to the drive device. The rotating shaft (52) is provided with two identical and symmetrical first elliptical cavity blocks (523) and second elliptical cavity blocks (524) in the middle. The first elliptical cavity block (523) and the second elliptical cavity block (524) are respectively located at one end of the long axis section (521) and the short axis section (522) near the middle of the rotating shaft (52). After the first elliptical cavity block (523) and the second elliptical cavity block (524) are installed, they are combined to form an elliptical cavity (525). The intersection of the long axis and the short axis of the elliptical cavity (525) coincides with the intersection of the axis of the cylinder (1) and the axis of the rotating shaft (52). The length of the short axis of the elliptical cross section of the elliptical cavity (525) is equal to the port diameter of the oil inlet pipe (2).

2. The variable frequency pulse injection device according to claim 1, characterized in that: The rotating shaft cavity (5) is provided with end caps (53) and bushings (54) on both sides. The long shaft section (521) and the short shaft section (522) are positioned by the end caps (53) and bushings (54) on both sides respectively. The long shaft section (521) extends outward from the cylinder body (1) through the end cap (53) on one side and is connected to the drive device.

3. The variable frequency pulse injection device according to claim 2, characterized in that: The long axis segment (521) and the short axis segment (522) are respectively provided with a first sealing sleeve (55) and a second sealing sleeve (56) between the end of the long axis segment (521), the first sealing sleeve (55), the second elliptical cavity block (524) and the cylinder body (1). The long axis segment (521), the first sealing sleeve (55) and the first elliptical cavity block (523) are fixedly connected as a whole by screws. The short axis segment (522), the second sealing sleeve (56) and the second elliptical cavity block (524) are fixedly connected as a whole by screws. The long axis segment (521), the first sealing sleeve (55), the first elliptical cavity block (523), the second elliptical cavity block (524), the short axis segment (522) and the second sealing sleeve (56) are all provided with at least two bolt through holes at corresponding positions and are fixedly connected as a whole by bolts.

4. The variable frequency pulse injection device according to claim 1, characterized in that: The nozzle assembly (4) includes a nozzle seat (41) fixedly connected to the cylinder (1) and a fuel nozzle (42) detachably connected to the nozzle seat (41). A sealing groove is provided at the connection between the nozzle seat (41) and the cylinder (1), and a sealing gasket is provided in the sealing groove. An injection through hole is provided in the fuel nozzle (42), and the cross-section of the injection through hole is elliptical. A metal wire mesh is provided between the fuel line of the nozzle seat (41) and the injection through hole.

5. The variable frequency pulse injection device according to claim 3, characterized in that: Both the first sealing sleeve (55) and the second sealing sleeve (56) are provided with sealing rings (57) at the connection with the cylinder body (1). The sealing rings (57) are H-shaped and have a 45° chamfer in the direction of the cylinder body (1) axis.

6. The variable frequency pulse injection device according to claim 5, characterized in that: The sealing ring (57) on either side includes at least two sealing rings (57) arranged side by side, which are equidistant from each other based on the height of the first sealing sleeve (55) or the second sealing sleeve (56).

7. The variable frequency pulse injection device according to claim 1, characterized in that: The oil outlet pipeline (3) includes a first oil outlet pipeline and a second oil outlet pipeline. The inner diameter of the first oil outlet pipeline is larger than the inner diameter of the second oil outlet pipeline. The first oil outlet pipeline has a smooth arc surface at the end near the second oil outlet pipeline leading to the oil inlet of the second oil outlet pipeline.

8. The variable frequency pulse injection device according to claim 7, characterized in that: The inner wall of the oil inlet pipe (2) near the elliptical cavity (525) is provided with an arc-shaped smooth structure. The port diameter of the oil inlet pipe (2) near the elliptical cavity (525) is larger than the port diameter of the elliptical cavity (525) and equal to the minor axis length of the elliptical cross section of the elliptical cavity (525). The port diameter of the first oil outlet pipe is 3mm~5mm smaller than the port diameter of the elliptical cavity (525).

9. The variable frequency pulse injection device according to claim 3, characterized in that: The shaft (52) cavity is provided with two shaft sleeves (58) corresponding to the positions of the long shaft section (521) and the short shaft section (522). The shaft sleeves (58) are interference-fitted with the cylinder body (1). The ball bearing (51) and the sealing ring (57) on either side are tightly fitted to the inner wall of the corresponding shaft sleeve (58).

Images