CN-118189215-B - Variable frequency pulse injection device

CN118189215BCN 118189215 BCN118189215 BCN 118189215BCN-118189215-B

Abstract

The invention provides a variable frequency pulse injection device which comprises a cylinder body with a through middle part, wherein the cylinder body comprises an oil inlet pipeline and an oil outlet pipeline, the inner diameter of the oil inlet pipeline is larger than the inner diameter of the oil outlet pipeline, a spray head assembly is arranged at the outlet of the oil outlet pipeline, the cylinder body also comprises a rotating shaft cavity perpendicular to the axis of the cylinder body, a rotating shaft which is rotatably connected with the cylinder body through a ball bearing is arranged in the rotating shaft cavity, the rotating shaft comprises a long shaft section extending to the outer side of the cylinder body and a short shaft section positioned in the cylinder body, the middle part of the rotating shaft is provided with a first elliptic cavity block and a second elliptic cavity block which are identical in shape and are bilaterally symmetrical, and the first elliptic cavity block and the second elliptic cavity block are combined to form an elliptic cavity after being installed. The invention has the beneficial effects that by combining the rotating shaft with the cylinder body, which is specially designed, the change of pulse injection frequency is controlled by controlling the change of the rotating speed of the rotating shaft, and the response speed of the injection device is improved by utilizing the characteristics of accurate rotating speed control and high response speed of the servo motor.

Inventors

CHEN CHEN
ZHENG QINYU
WANG YUNFEI
YIN BIFENG
Si Haoqing
Niu Rongqi
PANG DONGMING

Assignees

江苏大学

Dates

Publication Date: 20260512
Application Date: 20240321

Claims (9)

1. The variable frequency pulse injection device comprises a cylinder body (1) with a through middle part, wherein the cylinder body (1) comprises an oil inlet pipeline (2) and an oil outlet pipeline (3), the inner diameter of the oil inlet pipeline (2) is larger than that of the oil outlet pipeline (3), a spray head assembly (4) is arranged at the outlet of the oil outlet pipeline (3), and the variable frequency pulse injection device is characterized in that the cylinder body (1) also comprises a rotating shaft cavity (5) perpendicular to the axis of the cylinder body (1), a rotating shaft (52) rotatably connected with the cylinder body (1) through a ball bearing (51) is arranged in the rotating shaft cavity (5), the rotating shaft (52) comprises a long shaft section (521) extending to the outer side of the cylinder body (1) and a short shaft section (522) positioned in the cylinder body (1), and one end, far away from the short shaft section (522), of the long shaft section (521) is connected with a driving device; The novel oil inlet pipeline is characterized in that two first elliptic cavity blocks (523) and second elliptic cavity blocks (524) which are identical in shape and symmetric left and right are arranged in the middle of the rotating shaft (52), the first elliptic cavity blocks (523) and the second elliptic cavity blocks (524) are respectively arranged at one ends, close to the middle of the rotating shaft (52), of the long shaft section (521) and the short shaft section (522), the first elliptic cavity blocks (523) and the second elliptic cavity blocks (524) are assembled after being installed to form an elliptic cavity (525), the intersection point of the long axis and the short axis of the elliptic cavity (525) coincides with the intersection point of the axis of the cylinder body (1) and the axis of the rotating shaft (52), and the short shaft length of the elliptic section of the elliptic cavity (525) is equal to the port diameter of the oil inlet pipeline (2).
2. The variable frequency pulse injection device according to claim 1, wherein end covers (53) and shaft sleeves (54) are arranged on two sides of the rotating shaft cavity (5), the long shaft section (521) and the short shaft section (522) are respectively positioned through the end covers (53) and the shaft sleeves (54) on two sides, and the long shaft section (521) penetrates through the end cover (53) on one side to extend out of the cylinder body (1) to be connected with a driving device.
3. The variable frequency pulse injection device according to claim 2, wherein a first sealing sleeve (55) and a second sealing sleeve (56) are respectively arranged between one end, close to the first elliptic cavity block (523) and the second elliptic cavity block (524), of the long shaft section (521) and the short shaft section (522) and the cylinder body (1), the long shaft section (521), the first sealing sleeve (55) and the first elliptic cavity block (523) are fixedly connected into a whole through screws, the short shaft section (522), the second sealing sleeve (56) and the second elliptic cavity block (524) are fixedly connected into a whole through screws, and at least two bolt through holes corresponding to positions are formed in the long shaft section (521), the first sealing sleeve (55), the first elliptic cavity block (523), the second elliptic cavity block (524), the short shaft section (522) and the second sealing sleeve (56) and are fixedly connected into a whole through screws.
4. The variable frequency pulse injection device of claim 1, wherein the nozzle assembly (4) comprises a nozzle seat (41) fixedly connected with the cylinder body (1) and a fuel nozzle (42) detachably connected with the nozzle seat (41), a sealing groove is formed at the joint of the nozzle seat (41) and the cylinder body (1), a sealing gasket is arranged in the sealing groove, an injection through hole is formed in the fuel nozzle (42), the section of the injection through hole is elliptical, and a metal wire mesh is arranged between a fuel pipeline of the nozzle seat (41) and the injection through hole.
5. The variable frequency pulse injection device according to claim 3, wherein sealing rings (57) are arranged at the joints of the first sealing sleeve (55) and the second sealing sleeve (56) and the cylinder body (1), and the sealing rings (57) are H-shaped and are provided with 45-degree chamfers towards the axis direction of the cylinder body (1).
6. A variable frequency pulse injection apparatus as set forth in claim 5, wherein the seal ring (57) on either side comprises at least two seal rings (57) arranged side by side equidistantly with respect to the height of the first seal sleeve (55) or the second seal sleeve (56).
7. The variable frequency pulse injection device according to claim 1, wherein the oil outlet pipeline (3) comprises a first oil outlet pipeline and a second oil outlet pipeline, the inner diameter of the first oil outlet pipeline is larger than that of the second oil outlet pipeline, and the first oil outlet pipeline is arranged to be a smooth cambered surface towards an oil inlet of the second oil outlet pipeline at one end close to the second oil outlet pipeline.
8. The variable frequency pulse injection device of claim 7, wherein an arc-shaped smooth structure is arranged on the inner wall, close to one end of the elliptical cavity (525), of the oil inlet pipeline (2), the diameter of a port, close to one end of the elliptical cavity (525), of the oil inlet pipeline (2) is larger than the diameter of the port of the elliptical cavity (525) and is equal to the short axis length of the elliptical section of the elliptical cavity (525), and the diameter of the port of the first oil outlet pipeline is smaller than 3 mm-5 mm of the diameter of the port of the elliptical cavity (525).
9. The variable frequency pulse injection device according to claim 3, wherein two rotating shaft cavity sleeves (58) corresponding to the positions of the long shaft section (521) and the short shaft section (522) are arranged in the cavity of the rotating shaft (52), the rotating shaft cavity sleeves (58) are in interference fit with the cylinder body (1), and the ball bearings (51) and the sealing rings (57) on any side are tightly attached to the inner walls of the corresponding rotating shaft cavity sleeves (58).

Description

Variable frequency pulse injection device Technical Field The invention relates to the technical field of engine oil injectors, in particular to a variable frequency pulse injection device. Background In the current aviation industry, scramjet engines have gained widespread attention as an efficient, high thrust power system. Pulse injection devices, as a core component of scramjet engines, still face a number of technical challenges that limit the overall system performance improvement. The pulse injection device is used as a key component of a combustion control system of the scramjet engine and is used for precisely injecting fuel to realize an efficient combustion process. The conventional pulse injection device has a certain limit in the injection speed, spray uniformity, response speed, and the like of the liquid fuel. The mechanical pulse injection device is difficult to quickly adjust injection parameters due to the complex structure, so that the mechanical pulse injection device has poor adaptability in a dynamic working environment. Electromagnetic and piezoelectric pulse jetting devices, although having improved response rates to some extent, are limited by high power sources and structural durability, which limits their widespread use in practical applications. At present, the design of the injection device mainly adopts circular spray holes which are uniformly distributed on the spray heads, and the number of the spray holes can be single or multiple. Because the spray holes spray along the axis, the oil mist is dispersed in a cone shape, and the oil mist is unevenly distributed in the areas among the spray holes, wherein the oil mist quantity in certain areas is obviously reduced. This results in a reduced mixing effect, resulting in a reduced degree of adequate mixing of air and fuel, which in turn affects combustion efficiency. At present, the pulse injection device is poor in stability, and cannot continuously and stably provide accurate oil injection quantity. Secondly, the response speed is slow, and the oil injection parameters cannot be adjusted in time to adapt to the rapidly-changing working environment. In addition, the nozzle hole layout and shape design are not good, so that the oil mist atomization effect is not ideal, and the full mixing of fuel and air is influenced. Disclosure of Invention Aiming at the defects existing in the prior art, the invention provides the variable frequency pulse injection device, through the combination of the rotating shaft and the cylinder body which are specially designed, the change of the pulse injection frequency is controlled by controlling the change of the rotating speed of the rotating shaft, the cross section shape of the elliptical cavity is designed to be elliptical, the disturbance of fluid flow is reduced, the inertia force of the fluid flow is reduced, the generation of vortex is reduced, the action of inertia force is reduced, the influence of water hammer effect is reduced, the fluid flow of a pipeline is more stable, and the stability of the pulse injection device is improved. According to the technical scheme, the variable frequency pulse injection device comprises a cylinder body with a through middle part, the cylinder body comprises an oil inlet pipeline and an oil outlet pipeline, the inner diameter of the oil inlet pipeline is larger than that of the oil outlet pipeline, a spray head assembly is arranged at an outlet of the oil outlet pipeline, the cylinder body further comprises a rotating shaft cavity perpendicular to the axis of the cylinder body, a rotating shaft which is rotatably connected with the cylinder body through a ball bearing is arranged in the rotating shaft cavity, the rotating shaft comprises a long shaft section extending to the outer side of the cylinder body and a short shaft section located in the cylinder body, one end of the long shaft section, far away from the short shaft section, is connected with a driving device, two first elliptic cavity blocks and second elliptic cavity blocks which are identical in shape and are bilaterally symmetrical are arranged in the middle of the rotating shaft, the first elliptic cavity blocks and the second elliptic cavity blocks are respectively arranged at one end, close to the middle of the rotating shaft, the first elliptic cavity blocks and the second elliptic cavity blocks are assembled to form an elliptic cavity after being mounted, the intersection point of the long axis and the short axis of the elliptic cavity is coincident with the axis of the cylinder body and the short shaft, and the intersection point of the elliptic cavity is equal to the length of the oil inlet pipeline. The invention combines the rotating shaft with the cylinder body through the special design, controls the change of pulse injection frequency by controlling the change of the rotating speed of the rotating shaft, improves the response speed of the injection device by utilizing the charact