SU798340A2 - Injection nozzle with hydraulic closing of needle - Google Patents

Description

I

The invention relates to fuel apparatus for an internal combustion engine, and specifically to devices for discharging fuel into a cylinder.

According to the main author. St. N 315778 is a well-known nozzle with a hydraulic needle needle, designated for fuel injection into the cylinder of diesel. The nozzle contains a housing with a hydraulic valve Kamyu, fed with a shut-off valve through the supply channel, and equipped with a drain valve, which has electromagnetic programmed control, with an irrigation device l installed in the supply channel.

In such a nozzle design, a considerable amount of fuel is consumed during the injection period through the drain valve.

The aim of the invention is to reduce fuel consumption in the regulation

This is achieved by the fact that in the nozzle, with hydraulic locking of the needle according to the author. St. NO 315778 The gypsum shut-off chamber and the supply channel are interconnected by an additional channel in which the cavity is made: there is a two-valve valve equipped with locking elements placed at the outlets from the cavity, and the entrance to the cavity is connected to the supply channel to the throttle device in the course of supplying the locking environment-fuel. The surface of the locking elements of the two-way valve is made profile, and the two-seat valve is spring-loaded.

Such a constructive solution ensures a reduction in fuel consumption for regulation.

FIG. 1 shows the nozzle, a general view; in fig. 2 - the same, with a flat locking element; in fig. 3 the same, with a conical locking element; in fig. 4 - the same, with a risky locking element; in fig. 5 is the same, with the spherical slide valve in FIG. 6 - execution of a two-valve valve spring-loaded,

In the body I of the nozzle there is a hyaropair chamber 2 located above the needle 3 and connected by channels

4 and 5 through the throttle 6 with the inlet channel 7. In the channel 5 there is a drain valve 8 with an electromagnetic actuator 9. The podgolny chamber 10 is equipped with cables 11 and 12, the latter

a throttle device 13 is installed with an inlet channel 7, In an additional channel 14 connecting channels 5 and 11, the cavity 15 is made with a double-seat valve 16 located in it, the locking elements 17 and ..18 of which are located at the exits 19 and 20 leading to accordingly, in the sub-chamber 1O and in the rkjapo-support chamber 2. Entrance 21 to cavity 15 is connected by channel 11 with supply channel 7 to throttle device 13 during the course of fuel supply.

In the period between injections, when

a drain valve 8 with an electromagnetic actuator 9 closes the channel 5, the needle 3 is in its lower position relative to the housing I, the Two-seat valve 16 with a locking element 17

interfaced with outlet 19 of cavity 15. For this, the fiddle chamber 2 is connected by channels 4 and 5 with open exit 20 of cavity 15, inlet 21 and channel 22 with feed channel 7, i.e. pressure in the pressure chamber 2 is equal to pressure in The supply of channel 1 is 7. In the suppressed chamber 1O, the pressure fuel will also be equal to the pressure in supply channel 7, since they are connected to each other by channel 11 in

Thus, the double-seat valve 16 is in a state of equilibrium during this period of time, and the zleg 3 is loaded with a downward force

relative to the nozzle body 1 and proportional to the difference in the effective pls of the needle .v of the needle section 3, spaced in the watertight chamber 2 and in the sub-chamber 10.

At the time of the start of opening the drain valve 8 of the passage section of the channel 5, the pressure in this channel will begin to decrease. Fuel from supply channel 7 through inlet 21 of cavity 15 and open outlet 2O will begin to flow into channel 5 and then into the drain. At some point of time, the opening of the tank head of the channel section 5 of the drain

the valve 8 will be so significant that in the space between the outlet 20 and the shut-off element 18 of the double-seat valve 16, the process of fuel throttling will begin. The pressure of the fuel on the double-seat valve 16 from the side of the locking element

18 is smaller than on the side of the locking element 17, i.e. the balance of forces acting on the 16 will be disturbed. This leads to the fact that the valve 16 is pfemestits towards the outlet 20 and the locking element 18 will block it. After that, the pressure in the hydroseal chamber 2, due to the further opening of the flow area of the channel 5 by the drain valve 8, will drop sharply. Needle 3 by force from fuel pressure

in podygot) NOY chamber 10, communicated by channels II and 14, open output

19, cavity 15, inlet 21 and channel 22 with inlet channel 7, will begin its upward movement relative to housing I, starting fuel.

During the injection period, the force acting on the valve 16 from the outlet side 20 will be almost equal to zero, since the flow area of the channel

5 fully open. Fuel inflow. From supply channel 8 through choke

6 will be insignificant, and the locking element 18 is pressed against the pin 2O with force

proportional to pressure during exit 19 and its area.

At the same time, the pressure drop in the area between the inlet channel 7 and the elevator chamber 10 is small, since the effect

throttling the fuel in npocrpaHCtse between the valve locking element 17

15 and exit 19 of cavity 15 are insignificant.

Claims (3)

When the drain valve .8 of channel 5 overlaps, the pressure in hygrographic chamber 2 will begin to increase, as channel 5 through {phossel 6 is connected to supply channel 7. At the moment when the fuel pressure in channel 5 exceeds the pressure in sub-chamber 10, and consequently, at outlet 19 in cavity 15, valve 16 will begin to be rearranged towards outlet 19, the effect of throttling of fuel in the space between the locking element 17 of valve 16 and outlet 19 of cavity 15 increases. Period of pressure in the section between base chamber 10 and feed Canada 7 years old melts. In this case, the needle 3 is observed downward relatively to the housing 1, since there is a difference in aaoleology in the parrot chamber Yu and the fire chamber 2, this ensures the end of the injection process. At the time of the end of the fuel injection process, the pressure in the sub-chamber is less than in the pilot 5. Channel. The pressure equalization is provided by the throttle device 13, and the cycle of operation in the nozzle is repeated. The double seat valve 16 is made with cylindrical locking elements 18 and 17 of equal area. Such an embodiment of a double-seat valve provides approximately the same speeds of its movement in the forward and reverse direction. To regulate the speed of movement of the double-seat valve and select the necessary law of its movement, the locking elements 17 and 18 can be made as shown in FIG. 2-4, of different areas, and their surface is a profile plane (Fig. 2), conical (Fig. 3), spherical (Fig. 4). Such production provides different ratios between the forces acting on the two-seater valve 16 D, the period of its movement from the side of the locking elements 17 and 18, which ultimately affects the amount of fuel consumption on the regulation. In addition, the throttle 6 and the throttle device 13 can be made in the locking elements, respectively, 18 n 17 (Fig. 2-4). The two-seat valve 16 can be made in the form of a ball (Fig. 5). The law of its movement at the same time in the forward and backward direction can be controlled by BHnojraemcs sections of exits 18 and 19 of different villages. In order to maintain a two-seat valve stable in / out during the period between injections, as well as to increase its speed during the end of the injection process and thus reduce the fuel consumption for regulation, valve 16 can be made spring-loaded, as shown in FIG. 6. The spring 23 is installed on the side of the locking element 18. The operation of the variants of the nozzle shown in FIG. 2-6, and it does not differ from the described variant presented in 4ig. I. Due to the fact that in the period of fuel injection, the supply channel is co-amp and yen with a hydraulic blocking chamber only through a choke, whose hydraulic resistance can be very large, and the speed of raising and landing of the double-seat valve can be quite high, the fuel consumption for regulating decreases more than 3 times. Claims 1. Injection nozzle with hydraulic needle locking according to ed. St. N 315778, characterized in that, with a decrease in fuel consumption by. the regulation, the hydrolock chamber and the inlet channel are interconnected by an additional channel in which the cavity is made with a double-seat valve located in it, fitted with shut-off elements placed at the outlets of the cavity, and the entrance to the cavity is connected to the backdoor channel during the filing of the lock. 2. The injector according to claim I, in connection with the fact that the surface of the clogging elements of the double-seat valve is made profile. 3. The nozzle on the PP. 1 and 2, that is, with the fact that the double-seat valve is spring-loaded. Sources of information taken into account in the examination I. USSR author's certificate № 31S778, cl. G 02 M 47 / O2, 1971. Faye.1 t / s.Z nineteen / 7 12 Fig.d y6 f, € S 9 Figb nineteen / 7 . €