CN104142607B - Beam condensing unit for high-speed camera microscopic photography nozzle spray form - Google Patents

Abstract

The invention mainly relates to engine fuel injector technology, further to a kind of for high-speed camera microscopic photography fuel injector spray discharge pattern time strengthen fuel injector nozzle brightness beam condensing unit.For the beam condensing unit of high-speed camera microscopic photography nozzle spray form, including: conical surface condenser lens 1, the fixing device 6 being connected with conical surface condenser lens vertex of a cone position；Described conical surface condenser lens is connected by fixed mount 5 with described fixing device.The present invention has the beneficial effect that the reflection by the optically focused conical surface relative to prior art, it is ensured that after light intensity light source irradiates nozzle, and reflection light as much as possible enters the microlens of high-speed camera, tiny area has been effectively ensured and has entered the light-inletting quantity of camera lens.

Description

Light-gathering device for high-speed camera micrograph of nozzle spray pattern

Technical field:

The invention mainly relates to the technology of an engine fuel injector, and further relates to a light concentrating device for enhancing the brightness of a fuel injector nozzle when a high-speed camera microscopically photographs the spray form of the fuel injector.

Background technique:

In the high-speed camera research of engine fuel injector spray, the shooting speed reaches tens of thousands or even hundreds of thousands of frames per second, which requires sufficient light intensity to ensure the clarity of the captured pictures, especially when using a microscope to observe the opening of the fuel injector. , When the local spray characteristics of the nozzle holes are closed, it is difficult to meet the light intensity requirements of high-speed shooting by directly using a strong light source. In addition, the vibration of the fuel injection will affect the light focusing effect. high demands. Some scholars have proposed to use a convex lens to concentrate light on the light source. This method can improve the brightness of the captured pictures to a certain extent, but it often cannot meet the requirements when shooting at higher speeds. The nozzle holes of direct injection gasoline engine injectors and high pressure common rail diesel engine injectors are generally arranged on non-planar conical surfaces. Because of the existence of the cone angle, the amount of reflected light entering the high-speed camera lens will be reduced, thereby affecting Capture clarity. Especially after the microscope lens is installed, the effective observation area is very small, and the requirements for light are higher. Just using the light source surface lighting method can no longer meet the needs of further research. In addition, for the spray-guided GDI injector, the spray angle is not uniform and direct, but has a certain angle with the vertical direction. Therefore, when the image light intensity is enhanced, the normal spraying of the injector is guaranteed at the same time. Therefore, it is particularly important to design a device that can gather light and meet different requirements for light according to different occasions.

Invention content:

In order to solve the above-mentioned technical problems, the present invention invents a device that can effectively reflect the incident light back through the cone surface to meet the high-speed camera, especially the light intensity requirements after the microscope lens is installed.

The concentrating device used for high-speed camera microphotographing nozzle spray form includes: conical condenser 1, the top of the cone has a first through hole along the direction of the centerline of the cone; a fixing device 6 connected to the conical top of the conical condenser, There is a through hole 11 in the fixing device, and the nozzle passes through the through hole and the first through hole in turn and is located in the conical condenser lens;

As a preferred solution, the conical condenser is rolled from a piece of flexible fan-shaped reflector; and also includes: an adjustable clamp 3 positioned on the outer peripheral surface of the cone bottom of the conical condenser, and the adjustable clamp is realized by rotating the knob 2 Tighten and relax, and then adjust the cone angle of the conical condenser.

As one of the further preferred solutions, the range of the adjustable clamp to adjust the cone angle of the conical surface condenser is greater than 0 degrees and less than or equal to 120 degrees.

As a second preferred solution, there is a rectangular hole 4 directly below the conical condenser, through which the fuel injected by the nozzle falls to the outside, preventing it from falling on the inner wall of the conical surface.

As a third preferred solution, the fixing device includes four adjusting bolts, which are respectively the first adjusting bolt 7, the second adjusting bolt 9, the third adjusting bolt 8, and the fourth adjusting bolt 10; the first adjusting bolt and the third adjusting bolt The adjusting bolts are opposite, and the axes of the two are on the same straight line; the second adjusting bolt is opposite to the fourth adjusting bolt, and the axes of the two are on the same straight line; the axes of the first adjusting bolt and the second adjusting bolt are perpendicular, and not in within a plane.

As a fourth preferred solution, the inner surface of the conical condenser lens is a galvanized surface.

The beneficial effect of the present invention relative to prior art is:

(1) The present invention ensures that after the strong light source irradiates the nozzle, as much reflected light as possible enters the microscope lens of the high-speed camera through the reflection of the converging cone surface, effectively ensuring the amount of light entering the lens in a small area.

(2) In the optimization scheme, the adjustment of the cone angle of the concentrating cone surface is realized, which enhances the adaptability of the device.

(3) In the optimized scheme, the four adjusting bolts on the fixing device realize the adjustable angle between the center axis of the nozzle and the center line of the concentrating cone surface, which is used to observe the physical form of the nozzle spray from multiple directions and angles.

(4) In the optimization scheme, the square hole directly below the concentrating cone surface effectively discharges the fuel ejected from the nozzle to the outside of the cone surface, ensuring the cleanliness of the cone surface and maintaining the stability of the optical reflection ability.

Description of drawings:

Fig. 1 is the overall layout of the present invention in the embodiment. In the figure, 1 represents the conical condenser, 2 represents the knob, 3 represents the adjustable clamp, 4 represents the rectangular hole, 5 represents the fixing frame, 6 represents the fixing device, and 7 represents the first adjusting bolt.

Fig. 2 is a front view of Fig. 1 .

FIG. 3 is a longitudinal sectional view of FIG. 2 .

Fig. 4 is a bottom view of Fig. 1 .

Fig. 5 is a left side view of Fig. 1 .

Fig. 6 is a structural schematic view of the fixing device, in which, 7 represents the first adjusting bolt, 8 represents the third adjusting bolt, 9 represents the second adjusting bolt, 10 represents the fourth adjusting bolt, and 11 represents the through hole.

Figure 7 is a schematic diagram of the injector structure.

Fig. 8 is the situation of light incident and reflection when photographing nozzle spray form in the prior art.

Fig. 9 is the incident and reflection of light when shooting the nozzle spray form after adopting the technical solution of the present invention.

Figure 10 shows the embodiment, the four adjusting bolts on the fixing device realize the adjustable angle between the center axis of the nozzle and the center line of the concentrating cone surface, and the incidence and reflection of light when shooting the nozzle spray form.

detailed description:

Example:

Concentrating device for high-speed camera microscopic photography of nozzle spray patterns, including:

The conical condenser 1 has a first through hole along the cone centerline direction at the top of the cone; the fixture 6 connected to the cone top of the conical condenser has a through hole in the fixture, and the nozzle passes through the through hole 11, the first A through hole is located in the conical condenser; the conical condenser is connected to the fixing device through the fixing frame 5;

The conical condenser is rolled from a piece of flexible fan-shaped reflector; and also includes: an adjustable clamp 3 positioned at the outer peripheral surface of the cone bottom of the conical condenser, by rotating the knob 2, the adjustable clamp can be tightened and tightened. Relax, and then adjust the cone angle of the cone condenser.

The range of the adjustable clamp to adjust the cone angle of the conical surface condenser is greater than 0 degrees and less than or equal to 120 degrees. There is a rectangular hole 4 directly below the conical surface condenser, through which the fuel sprayed by the nozzle falls to the outside, preventing it from falling on the inner wall of the conical surface. The fixing device includes 4 adjusting bolts, which are respectively the first adjusting bolt 7, the second adjusting bolt 9, the third adjusting bolt 8, and the fourth adjusting bolt 10; the first adjusting bolt is opposite to the third adjusting bolt, and both The axis of the second adjusting bolt is on the same straight line; the second adjusting bolt is opposite to the fourth adjusting bolt, and the axes of the two are on the same straight line; the axes of the first adjusting bolt and the second adjusting bolt are perpendicular and not in a plane. The inner surface of the conical condenser mirror is a galvanized surface.

From the comparison of Fig. 8-Fig. 10, with the technical solution of the present invention, the proportion of light returning to the original direction is greatly increased compared with the prior art, which ensures the amount of light entering the lens during microscope observation.

Claims (6)

1. for the beam condensing unit of high-speed camera microscopic photography nozzle spray form, its feature It is, including:

Conical surface condenser lens (1), vertex of a cone position has one along the first through hole of circular cone centerline direction；

The fixing device (6) being connected with conical surface condenser lens vertex of a cone position, has one in fixing device Through hole (11), nozzle is positioned at conical surface condenser lens after sequentially passing through through hole, the first through hole；

Described conical surface condenser lens is connected by fixed mount (5) with described fixing device.

The most according to claim 1 for high-speed camera microscopic photography nozzle spray form Beam condensing unit, it is characterised in that described conical surface condenser lens is by the fan-shaped reflector of a piece of flexibility Roll and form；And also include:

It is positioned at the scalable clip (3) of conical surface condenser lens cone end outer peripheral face, passes through rotary knob , it is achieved the tightening up and loosen of scalable clip, and then the cone angle of cone governor face condenser (2).

The most according to claim 2 for high-speed camera microscopic photography nozzle spray form Beam condensing unit, it is characterised in that the model of described scalable clip cone governor face condenser cone angle Enclose for more than 0 degree, and less than or equal to 120 degree.

The most according to claim 2 for high-speed camera microscopic photography nozzle spray form Beam condensing unit, it is characterised in that have a rectangular opening (4) immediately below described conical surface condenser lens, The fuel that nozzle ejects falls outside by this hole, it is therefore prevented that fall at conical surface inwall.

The most according to claim 2 for high-speed camera microscopic photography nozzle spray form Beam condensing unit, it is characterised in that described fixing device include 4 regulation bolts, be respectively First regulation bolt (7), the second regulation bolt (9), the 3rd regulation bolt (8), the 4th tune Joint bolt (10)；First regulation bolt and the 3rd regulation bolt are relative, and the axis of the two exists On same straight line；Second regulation bolt and the 4th regulation bolt are relative, and the axis of the two is same On one straight line；First regulation bolt is vertical with the axis of the second regulation bolt, and does not puts down at one In face.

The most according to claim 2 for high-speed camera microscopic photography nozzle spray form Beam condensing unit, it is characterised in that described conical surface condenser lens inner surface is galvanizing surface.