CN111852711A - Experimental apparatus is surveyd in fuel sprayer atomizing - Google Patents

Abstract

The invention discloses a fuel injection nozzle atomization observation experiment device, comprising a box body, a fuel injection nozzle support frame, a fuel injection nozzle, a vacuum pump, a high-speed photographing device, a spray liquid pipe, and a light-filling mechanism. The front panel of the box body is provided with an observation belt The door of the window; the high-speed shooting device is located in front of the box body; the rear panel of the box body is provided with a vacuum port to connect the external vacuum pump through the air pipe; the fuel injection nozzle support frame includes a bracket, a bracket table, and a fixed frame, and the two ends of the bracket table are respectively connected to the external vacuum pump. The bracket is fixedly connected, and there is a through hole I in the middle of the bracket platform; it is fixedly erected on the bracket platform; the fuel injection nozzle is vertically installed on the bracket platform, and the upper part is fixed by the fixing bracket; one end of the spray liquid pipe is connected with the fuel injection nozzle, and the other end It penetrates out of the box and is connected to the fuel injector integrated flow measuring instrument; the supplementary light mechanism is set in the box to supplement the lighting required for shooting. The invention is simple in structure and convenient in operation, and can carry out vacuum treatment in the box to study the atomization shape, spray angle and oil spray distance of the oil beam when there is no air resistance under the condition of negative pressure.

Description

An experimental device for atomization observation of fuel injectors

technical field

The invention belongs to the technical field of performance parameter measurement of fuel injectors, in particular to an experimental device for observing the atomization of fuel injectors.

Background technique

In various industrial systems and the automobile industry, the fuel injector of the internal combustion engine is relatively common. The fuel injector is provided with a fuel injection nozzle. The fuel injector receives the fuel injection pulse signal in the automobile and will accurately control the fuel injection amount. A fuel injector is a precision device with very high machining accuracy. At present, the detection of the atomization shape, injection angle, and injection distance of the oil beam injected by the injector has always been carried out by manual observation and then the injection angle of the injector. This method of staying in manual experience observation is difficult to meet the current Engines are demanding ever-increasing injection accuracy from injectors. Moreover, there is currently no special equipment on the market to detect the injection angle of the engine injector, and the detection by manual observation has a large error and a low precision.

SUMMARY OF THE INVENTION

The invention provides a fuel injection nozzle atomization observation experimental device, which is an atomization experimental device of an automobile fuel injection nozzle. The structure is simple and the operation is convenient. The shape of the oil beam, the injection angle, and the distance of the injection, and clearly observe whether the start and end of the injection of the injector are neat, and there are no abnormal phenomena such as dripping and secondary injection.

For achieving the above object, technical scheme of the present invention is as follows:

The spray nozzle atomization observation experiment device of the present invention includes a box body, a fuel spray nozzle support frame, a fuel spray nozzle, a vacuum pump, a high-speed photographing device, a spray liquid pipe, and a light-filling mechanism, and the box body is a rectangular box body, The middle part of the front panel of the box body is provided with a door, and the door is provided with a transparent observation window; the high-speed shooting device is arranged in front of the box body, aiming at the observation window;

The vacuum pump is arranged below the box body, and the lower right part of the rear plate of the box body is provided with a vacuum pumping port, and the vacuum pumping port is connected with the vacuum pump through an air pipe;

The fuel injection nozzle support frame includes a bracket, a bracket table and a fixing frame, and the brackets are provided with two groups, and the two groups of brackets are arranged in the middle of the bottom plate in the box along the left and right directions of the box body; The ends are respectively fixedly connected with the inner side of the top end of the bracket, and a through hole I is arranged in the middle of the bracket platform. The said fixed erection is on the support table; the said fuel injection nozzle is vertically arranged on the support table, the upper part is fixed by the fixing frame, the nozzle is vertically downwardly arranged, and extends under the support table through the through hole I; the said One end of the spray liquid pipe is connected with the fuel injection nozzle, and the other end penetrates out of the box and is connected with the integrated flow measuring instrument of the fuel injection nozzle.

The position where the gas pipe and the spray liquid pipe pass out of the box body are sealed by welding or by setting a sealing flange.

Further, the fixing frame includes a screw rod, a pressure plate, and a nut. The screw rod is provided with two screws, and the two screw rods are vertically arranged in the middle of the support table at intervals, and are located on both sides of the through hole I; the pressure plate is horizontally arranged on On the screw, the upper and lower end faces of the pressure plate are fixed by nuts; the middle of the pressure plate is provided with a through hole II, and the diameter of the through hole II is larger than the diameter of the upper pipe section of the fuel injection nozzle, and is smaller than the diameter of the middle pipe section of the fuel injection nozzle. The upper pipe section of the fuel injector protrudes above the pressure plate through the through hole II.

Further, it also includes a gasket, the gasket is arranged on the support table, the middle part of the gasket is provided with a through hole III, the diameter of the lower pipe section is smaller than the diameter of the through hole III, and the diameter of the middle pipe section is larger than The diameter of the through hole III, the lower pipe section extends under the support table through the through hole III and the through hole I in sequence.

Further, the bracket is composed of two support plates and a panel, the support plates and the panel are both vertically arranged, the two support plates are respectively fixedly connected with the two sides of the panel, and the panels of the two sets of brackets are arranged opposite to each other. parallel to each other.

Further, it also includes a ruler, the upper end of the ruler is fixedly connected with the middle part of the rear side edge of the support platform, and the ruler extends vertically downward. The scale is used to measure the length of the spray of the fuel injector, and is recorded by a high-speed photographing device in real time.

Further, the four corners of the bottom of the box body are provided with support feet.

Further, the door includes a door panel and a door frame, and a sealing ring is arranged on the edge of the front end face of the door frame.

Further, the observation window is provided on the door panel, or the entire door panel is made of transparent material.

Further, the high-speed shooting device includes a high-speed camera, a pan/tilt, a telescopic rod, and a tripod, the tripod is erected in front of the box body, on the center line of the box body, and the telescopic rod is vertically arranged on the tripod. , the PTZ is arranged on the upper end of the telescopic rod, and the high-speed camera is arranged on the PTZ, aiming at the observation window.

Further, it also includes a spray liquid supply pipe, the fuel injection nozzle is connected with the upper end of the spray liquid supply pipe, and the lower end extends vertically downward and then is horizontally bent backward and passes through the rear side of the box body.

Further, the supplementary light mechanism includes a lighting control switch, a vertical light bar, and a ring-shaped light bar; the ring-shaped light bar is arranged in the middle of the top of the box body, and a soft light plate is arranged under the ring-shaped light bar; The vertical light bars are arranged on the four corners of the inner side of the box, and the vertical light bars extend from the bottom plate to the soft light board; the lighting control switch is arranged on the front side of the box, and controls the vertical light bars, annular Light bar on and off.

The working process of the present invention is as follows:

Use a tool microscope to measure the diameter of the fuel injector, install the fuel injector on the fixed frame, and connect it with the external fuel supply equipment fuel injector comprehensive flow tester through the spray liquid pipe; adjust the brightness in the box through the lighting controller, and the door panel Close it, check the air tightness, and check the air tightness of the vacuum device; adjust the height and distance of the high-speed camera, turn on the vacuum pump to evacuate the inside of the box; set the fuel injection parameters and high-speed camera control parameters, and start the fuel supply equipment , the fuel injector sprays, and the high-speed camera shoots; after the high-speed camera collects the spray image at the standard time, it undergoes image preprocessing, including uneven correction, enhanced contrast, etc., and then uses the maximum inter-class variance method to achieve image binarization, determine Spray edge, and finally use image processing software to realize automatic measurement of GDI spray angle and penetration distance.

The beneficial effects of the present invention are:

The present invention adopts a high-speed camera to photograph the fuel injection situation, so that the state of the oil beam and the fuel injection distance can be seen intuitively, and the injection angle can be directly measured, and the telescopic rod can adjust the position of the high-speed camera, so that the shooting effect is better;

The fuel injection nozzle bracket of the present invention adopts gaskets to clamp the fuel injection nozzles, and can be replaced with corresponding gaskets according to the fuel injection nozzles of different diameters, thereby improving the compatibility of the experimental platform;

The door of the present invention is provided with a sealing ring, which can improve the sealing effect; the door panel is provided with an observation window or the whole door panel is made of transparent material, so that the shooting can be carried out smoothly;

The supplementary light mechanism of the present invention includes a vertical light bar and a ring light bar, and the light tubes are all treated with soft light, so as to prevent the high-speed camera from being overexposed and failing to achieve the desired effect; Perform brightness adjustment to meet specific experimental requirements;

The invention is an atomization observation experimental device for automobile fuel injection nozzles, which has simple structure and convenient operation, and solves the problems of large error and low precision in the prior art in the detection by means of manual observation; The internal vacuum treatment is carried out to study the atomization shape, injection angle, and injection distance of the fuel injection when there is no air resistance under the condition of negative pressure, and to clearly observe whether the start and end of the injection nozzle are neat, without dripping and two Abnormal phenomena such as secondary injection.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the present invention;

Fig. 2 is the structural representation of the box of the present invention;

Fig. 3 is the top view schematic diagram of the box of the present invention;

Fig. 4 is the structural representation of the fuel injection nozzle support frame of the present invention;

Fig. 5 is the structural representation of the fixing frame of the present invention;

Fig. 6 is the structural representation of the fuel injector of the present invention;

The serial numbers and names in the figure are as follows:

1-box body; 2-fuel injector; 3-door; 4-support; 5-support table; 6-vacuum pump; 7-fixed frame; 8-screw; 9-press plate; 10-washer; 11-nut; 12- ruler; 13- door panel; 14- door frame; 15- sealing ring; 16- high-speed camera; 17- telescopic rod; 18- tripod; 19- spray liquid pipe; 20- lighting controller; 21- support feet; 22 -Evacuation port; 23- Soft plate; 24- Trachea; 25- Upper pipe section; 26- Middle pipe section; 27- Lower pipe section; 28- Pan/Tilt.

41-support plate; 42-panel.

Detailed ways

The present invention will be described in detail below through specific embodiments in conjunction with the accompanying drawings.

Example 1

As shown in Figures 1-3, the fuel injector atomization observation experiment device of the present invention includes a box body 1, a fuel injector support frame, a fuel injector 2, a vacuum pump 6, a high-speed photographing device, a spray liquid pipe 19, and a fill light. Mechanism, the box 1 is a rectangular box, the middle part of the front panel of the box 1 is provided with a door 3, and the door 3 is provided with a transparent observation window; the high-speed shooting device is provided in the box 1 directly in front of the , aiming at the observation window;

The vacuum pump 6 is arranged below the box body 1, and the lower right part of the rear plate of the box body 1 is provided with a vacuum pumping port 22, and the vacuum pumping port 22 is connected with the vacuum pump 6 through an air pipe 24;

The fuel injection nozzle support frame includes a bracket 4, a bracket table 5, and a fixing frame. The bracket 4 is provided with two groups, and the two groups of brackets 4 are arranged in the middle of the inner bottom plate of the box body 1 along the left and right directions of the box body 1; The two ends of the support table 5 are respectively fixedly connected with the inner side of the top end of the support table 4, and a through hole I is provided in the middle of the support table 5, and the diameter of the through hole I is larger than the diameter of the lower pipe section 27 of the fuel injection nozzle 2. , smaller than the diameter of the middle pipe section 26 of the fuel injection nozzle 2; the fixing frame 7 is arranged on the support table 5; the fuel injection nozzle 2 is vertically arranged on the support table 5, the upper part is fixed by the fixing frame 7, and the spout It is arranged vertically downward, and extends under the support table 5 through the through hole I; one end of the spray liquid pipe 19 is connected to the fuel injection nozzle 2, and the other end penetrates out of the box 1 to measure the integrated flow rate of the fuel injection nozzle. The light-filling mechanism is set in the box body 1 to provide the light required for shooting.

The fixing frame 7 includes a screw 8, a pressure plate 9, and a nut 11. The screw 8 is provided with two screws. The two screws 8 are vertically arranged in the middle of the support table 5, and are located on both sides of the through hole I; The pressure plate 9 is horizontally arranged on the screw 8, the upper and lower end surfaces of the pressure plate 9 are fixed by the nuts 11, the middle of the pressure plate 9 is provided with a through hole II, and the diameter of the through hole II is larger than the diameter of the upper pipe section 25 of the fuel injection nozzle 2. , smaller than the diameter of the middle pipe section 26 of the fuel injection nozzle 2, and the upper pipe section 25 of the fuel injection nozzle 2 protrudes above the pressure plate 9 through the through hole II.

Also includes a gasket 10, the gasket 10 is arranged on the support table 5, the middle of the gasket 10 is provided with a through hole III, the diameter of the lower pipe section 27 is smaller than the diameter of the through hole III, the middle pipe section The diameter of 26 is larger than the diameter of the through hole III, and the lower pipe section 27 extends under the support table 5 through the through hole III and the through hole I in sequence.

The bracket 4 is composed of two support plates 41 and a panel 42. The support plates 41 and the panel 42 are both vertically arranged, and the two support plates 41 are fixedly connected to the two sides of the panel 42 respectively. The panels of 4 are arranged opposite and parallel to each other.

It also includes a ruler 12, the upper end of the ruler 12 is fixedly connected with the middle of the rear side edge of the support table 5, and the ruler 8 extends vertically downward.

The four corners of the bottom of the box body 1 are provided with supporting feet 21 .

The door 3 includes a door panel 13 and a door frame 14 , and a sealing ring 15 is provided on the edge of the front end of the door frame 14 .

The observation window is provided on the door panel 13, or the door panel 13 is made of transparent material as a whole.

The high-speed shooting device includes a high-speed camera 16, a pan/tilt 28, a telescopic rod 17, and a tripod 18. The tripod 18 is arranged in front of the box body 1 and is located on the center line of the box body 1. The telescopic rod 17 Vertically mounted on the tripod 18, the pan-tilt 28 is mounted on the upper end of the telescopic rod 17, and the high-speed camera 16 is mounted on the pan-tilt 28, aiming at the observation window.

It also includes a spray liquid supply pipe 19 , the fuel injection nozzle 2 is connected to the upper end of the spray liquid supply pipe 19 , and the lower end extends vertically downward and then bends horizontally backward, and passes through the rear side of the box body 1 .

The supplementary light mechanism includes a lighting control switch 20, a vertical light bar, and a ring-shaped light bar; the ring-shaped light bar is arranged in the middle of the inner top of the box body 1, and a soft light plate 23 is arranged below the ring-shaped light bar; The vertical light bars are arranged on the inner four corners of the box body 1, and the vertical light bars extend from the bottom plate to the soft light plate 23; the lighting control switch 20 is arranged on the front side of the box body 1 to control the vertical light bars. Turning on and off of straight light bar and ring light bar.

The working process of the present invention is as follows:

Use a tool microscope to measure the diameter of the fuel injector, install the fuel injector 2 on the fixing frame, and connect it with the fuel injector integrated flow measuring instrument through the spray liquid pipe 19; adjust the brightness in the box 1 through the lighting controller 20, Close the door panel 13, check the air tightness, and check the air tightness of the vacuum device; adjust the height and distance of the high-speed camera 16, turn on the vacuum pump 9 to evacuate the inside of the box 1; set the fuel injection parameters and the control parameters of the high-speed camera 16 , start the fuel supply equipment, inject the fuel injector 2, and shoot the high-speed camera 16; after the high-speed camera collects the spray image at the standard time, it undergoes image preprocessing, including uneven correction, contrast enhancement, etc., and then uses the maximum inter-class variance method. Realize the image binarization, determine the spray edge, and finally use the image processing software to realize the automatic measurement of GDI spray angle and penetration distance.

Claims (10)

1. The utility model provides an experimental apparatus is surveyd in fuel sprayer atomizing, includes box (1), fuel sprayer support frame, fuel sprayer (2), vacuum pump (6), high-speed shooting device, spraying liquid pipe (19), light filling mechanism, its characterized in that:

the box body (1) is a rectangular box body, a door (3) is arranged in the middle of a front side plate of the box body (1), and a transparent observation window is arranged on the door (3); the high-speed shooting device is arranged right in front of the box body (1) and is aligned to the observation window;

the vacuum pump (6) is arranged below the box body (1), the right lower part of the rear side plate of the box body (1) is provided with a vacuumizing port (22), and the vacuumizing port (22) is connected with the vacuum pump (6) through an air pipe (24);

the oil nozzle support frame comprises two groups of supports (4), a support platform (5) and a fixing frame (7), wherein the two groups of supports (4) are arranged in the middle of a bottom plate in the box body (1) at intervals along the left and right direction of the box body (1); the two ends of the support stand (5) are respectively fixedly connected with the inner side surface of the top end of the support (4), a through hole I is formed in the middle of the support stand (5), and the diameter of the through hole I is larger than that of a lower pipe section (27) of the oil nozzle (2) and smaller than that of a middle pipe section (26) of the oil nozzle (2); the fixing frame (7) is arranged on the support table (5); the oil nozzle (2) is vertically arranged on the support stand (5), the upper part of the oil nozzle is fixed by a fixing frame (7), the nozzle is vertically arranged downwards and extends into the position below the support stand (5) through the through hole I; one end of the spray liquid pipe (19) is connected with the oil nozzle (2), and the other end of the spray liquid pipe penetrates out of the box body (1) and is connected with the oil nozzle comprehensive flow meter; the light supplementing mechanism is arranged in the box body (1) and provides illumination required by shooting.

2. The oil nozzle atomization observation experiment device of claim 1, characterized in that: the fixing frame (7) comprises two screw rods (8), a pressing plate (9) and nuts (11), the two screw rods (8) are vertically arranged in the middle of the support platform (5) and located on two sides of the through hole I; the oil injection nozzle is characterized in that the pressing plate (9) is horizontally arranged on the screw rod (8), the upper end face and the lower end face of the pressing plate (9) are fixed through nuts (11), a through hole II is formed in the middle of the pressing plate (9), the diameter of the through hole II is larger than that of an upper pipe section (25) of the oil injection nozzle (2) and smaller than that of a middle pipe section (26) of the oil injection nozzle (2), and the upper pipe section (25) of the oil injection nozzle (2) stretches out of the pressing plate (9) through the through hole II.

3. The oil nozzle atomization observation experiment device of claim 2, characterized in that: still include gasket (10), gasket (10) locate on a support platform (5), the middle part of gasket (10) is equipped with through-hole III, the diameter of lower pipeline section (27) be less than the diameter of through-hole III, the diameter of well pipeline section (26) be greater than the diameter of through-hole III, lower pipeline section (27) are in proper order through-hole III, through-hole I stretch into below a support platform (5).

4. The oil nozzle atomization observation experiment device of claim 1, characterized in that: support (4) constitute by two backup pads (41) and a panel (42), backup pad (41) and panel (42) all vertical setting, two backup pads (41) respectively with the both sides limit fixed connection of panel (42), the panel of two sets of supports (4) sets up relatively and is parallel to each other.

5. The oil nozzle atomization observation experiment device of claim 1, characterized in that: still include scale (12), the middle part fixed connection of the upper end of scale (12) and support platform (5) back side edge, vertical downwardly extending of scale (12).

6. The oil nozzle atomization observation experiment device of claim 1, characterized in that: four corners of the bottom of the box body (1) are provided with supporting legs (21).

7. The oil nozzle atomization observation experiment device of claim 1, characterized in that: the door (3) comprises a door plate (13) and a door frame (14), the rear end of the door frame (14) is connected with the box body (1), and a circle of sealing ring (15) is arranged on the edge of the end face of the front end.

8. The oil nozzle atomization observation experiment device of claim 7, characterized in that: the observation window is arranged on the door panel (13), or the whole door panel (13) is made of transparent materials.

9. The oil nozzle atomization observation experiment device of claim 8, characterized in that: the high-speed shooting device comprises a high-speed camera (16), a tripod head (28), an expansion link (17) and a tripod (18), wherein the tripod (18) is arranged right in front of the box body (1) and is positioned on the central line of the box body (1), the expansion link (17) is vertically arranged on the tripod (18), the tripod head (28) is arranged at the upper end of the expansion link (17), and the high-speed camera (16) is arranged on the tripod head (28) and is aligned to the observation window.

10. The oil nozzle atomization observation experiment device of claim 1, characterized in that: the light supplementing mechanism comprises a lighting control switch (20), a vertical light bar and an annular light bar; the annular light bar is arranged in the middle of the inner top of the box body (1), and a light softening plate (23) is arranged below the annular light bar; the vertical light bars are arranged at four corners of the inner side of the box body (1) and extend from the bottom plate to the light softening plate (23); the lighting control switch (20) is arranged on the front side face of the box body (1) and used for controlling the opening and closing of the vertical light bar and the annular light bar.

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