SU909263A1 - Injection nozzle - Google Patents

Description

(54) SPRAYER

The invention relates to engineered operation. A nozzle with electrically controlled fuel injection into an internal combustion engine is known, containing a housing with a control chamber equipped with an arsenal of coupling with a source of fuel generation, a control electric valve with a passage through coupling of the chamber with a drain, a locking needle and a piston; loading the needle Cll .4 The non-staggered nozzle of this nozzle is an increased size. The purpose of the invention is to reduce the size. This goal is achieved by the fact that the shut-off part of the control valve is located in the control chamber and communicates with the end face of the change in the entrance section of the bypass channel. A hole is made in the piston through the end face and the needle to the control valve bypass channel. The piston is placed eccentrically in the body relative to the needle and the control valve, with the axes of the needle, the piston and the valve parallel to the axis of the piston, the axis of the piston is located between the needle and valve axes, and the distance between the valve axle, the piston and the needle is related by e. i - d Z is the distance between the valves and the valve; Pp is the distance between the needles and the pulley; diameter Porshn; the diameter of the valve. FIG. I shows an embodiment of an electrically controlled injector; in fig. 2 - scheme

eccentric arrangement of the needle piston and valve.

The nozzle includes a housing 1, in which the locking needle, 2, then 3, the choke 4 of the connection of the control chamber 5c of the source of fuel supply, the control electric valve 6 with the bypass channel 7 and the locking part 8, which contacts the end face 9 After the piston 3, the hole Yu of the cavity 11 between its arugo end and the needle 2 with the bypass channel 7 is made. After the needle 2, the pressure chamber 12 of the nozzle is located.

The nozzle works as follows.

In the absence of the control pulse supplied to the electric valve 6, its locking part 8 is in the lowest position and is in contact with the end face 9 of the piston 3. There is no gap between the end face -9 and the stop part 8 and the drain from the control chamber 5 from - no. The needle 2 due to the difference of forces acting from the side of the control chamber 5 on the piston 3 and from the side of the under-chamber camera 12 on the needle 2 is in the closed position. When a control pulse is applied to the electric valve 6, its locking part 8 is raised and the fuel through the gap between it and the valve 9 of the pore 3 enters the drain. Due to the pressure drop due to fuel consumption through the throttle 4, the pressure in the control chamber 5 is reduced. Due to the changed difference in the forces acting on the needle 2 and the piston 3, they begin to move upward relative to the housing 1. The process of fuel injection begins. As the piston 3 rises, the clearance decreases; between its end 9 with the locking part 8. In this case, due to a decrease in the flow area at the inlet to the bypass channel 7, the fuel consumption from the control chamber 5 decreases, and the pressure in it increases The needle 2 and the piston 3 approach the locking part 8 to the position when The equilibrium of forces acting on the side of the chamber 5 and the cavity 12 is reached. The remaining gap between the piston 3 and the locking part 8 does not depend on the position of the locking part 8, therefore the movement of the shaft 3 and the needle 2 connected to it causes the movement of the locking part 8. By this about The position of the needle 2 is controlled by changing the position

shut-off part 8. F3 is ultimately the form of the law of fuel supply to the engine cylinder, determined by the law of motion of the needle 2 (Determined by the shape of the electric control pulse supplied to the electric valve 6 and setting the law of motion of its stop part 8..

At the end of the submission of the manager

impulse to the electric valve 6, the locking part 8 descends and closes the drain from the control chamber 5, which ensures the closing of the needle 2 and the completion of the drift process.

In the future, the nozzle cycle is repeated.

Claims (3)

The design of the nozzle with the location of the locking part 8 directly in the control chamber 5 eliminates the need to have channels in the nozzle connecting the control chamber 5 to the electric valve 6, which reduces the number of nozzle elements. to simplify its design, reduce its size. Reduction of parasitic obe-. Moving the connecting channels reduces the inertia of control, which determines the speed of the nozzle, which, together with a clearer dependence of the needle position on the position of the locking member of the electric valve, expands the possibilities of controlling the law of fuel supply to the cylinder. Additional simplification of the design and reduction of the dimensions of the proposed nozzle is achieved by communication of the cavity between the needle and the piston with the locking member through the channels in the piston. This allows the use of one common drain line in the nozzle. Additional reduction of the nozzle dimensions is achieved by displacing the piston .3 and the electric valve 6 relative to the needle 2 in the direction opposite to the channel supplying fuel from the high-pressure head to the cavity 12 under the needle 2. At the same time, the position of the resultant force in the pressure 3 The connecting chamber 5 is displaced relative to the axis of force transmitted by the needle 2 to the piston 3. As a result, radial forces are applied to the piston 3, causing an increase in friction and reducing the reliability of the nozzle. To eliminate this, the axis of the needle, the piston and the valve are arranged parallel and in the same plane, as shown in FIG. 2 ,, hert - equivalent force from the fuel supply in the control chamber 5 to the piston 3; Ru - force transferred by needle 2 to piston 3; F | t is the equivalent force, taking into account the absence of pressure on a part of the surface of the piston 3 pro. shut-off part 8 of control valve 6; 2y; - the distance between the axis of valve 6 and rock 3; g is the distance between the axes of the needle 2 and the piston 3; {Зг | - piston diameter 3j is the effective diameter of the shut-off part 8 of the control valve 6; P - fuel injection in the control chamber 5, Raal force on the piston 3 not i. butt, if the torques M |, created by P (and P |, respectively, relative to the axis of the needle are mutually balanced. So. a) h) and C -M.R. Ji4N F., F |., The balancing condition. -4-sily after reducing d, -,,. 4-4 Д1 откуа With this ratio i, the distance between the axes of kapan 6 and the piston 3 to the distance between the axes of the needle 2 and the axle 3 is the equal force exerted on the piston from the control side, chamber 5, coincides with needles 2. Thus, the preloading nozzle allows installing the stop part of the control valve directly in the control chamber, interfacing the stop part of the control valve with the piston, making an opening in the piston connecting the cavity between the piston and the needle with the overflow control valve channel, eccentric valve By the arrangement of the piston and the valve relative to the needle and the implementation of the ratio of the distances between the main elements, it is possible to reduce the size and broaden the possibilities of controlling the law of fuel supply to the diesel cylinder, which, in turn, allows improving the performance of the diesel. .. Claim 1. Injury electrically operated for | comm; fuel to an internal combustion engine, comprising a housing with a control chamber equipped with a throttle for connecting to a fuel pressure source, controlling an electric valve with an overflow channel for connecting the chamber to a drain, a locking needle and a loading needle, characterized in that reducing the size, the locking part of the control valve is located in the control chamber and is in contact with the end of the piston to measure the flow cross section of the inlet of the bypass channel. 2. A nozzle according to Claim 1, characterized in that an opening of the cavity is made in the formation of the cavity between its end face and the needle with the bypass channel of the control valve. 3. The injector according to claim 1, 2, characterized in that the piston is placed eccentrically in the housing relative to the needle and the control valve, while the axis of the needle, the valve and the valve are parallel and in one plane, the axis of the piston is located between the axis of the needle and The valve, and the distances between the valve axes, the piston and the needles are related by the ratio 1k: .4-а4 1 Jn where 2 is the distance between the valve and piston axes; 2. - the distance between the axis of the needle and the ground; с1п - piston diameter; (3., - valve diameter. Sources of information taken into account during the examination. 1. USSR author's certificate N 490943, class R 02 M 51/06, 1976. F, dK L t FHI RU dn I //////////% ek “- her (puej FIG. g