SU1216396A1 - Power plant - Google Patents

Description

t

FIELD OF THE INVENTION The invention relates to mechanical engineering, in particular to power plants with hydraulic actuators of machine working parts.

The purpose of the invention is to increase reliability by protecting the diesel engine from overloads.

FIG. 1 shows a diagram of the power plant; in fig. 2 is a diagram of a system for automatic adjustment of a power plant; in fig. 3 is a circuit for activating a sensor for moving a rail of a fuel pump and a sensor for moving an organ for changing a displacement of a pump; in fig. 4 shows the characteristic change in the torque M of the diesel engine of the power plant from the rotation frequency i) of the diesel shaft at different positions of the fuel pump rail, which correspond to the values of iJ, M, m |, m, .... , ujg, nj, ms,.

The power plant contains a diesel engine 1 connected to an adjustable pump 2 with a variable displacement connected via check valves 3 and 4 to the hydraulic motor 5 (figure 1). Diesel 1 contains a rotational speed regulator 6 (Fig. 2) associated with the fuel pump rail (not shown) through its movement mechanism 7. Diesel 1 is covered by feedback on the displacement of the LP rail. Pump 2 is connected to the hydraulic motor 5 in terms of the working fluid flow Q, and the hydraulic motor 5 is feedback on the pressure of the working fluid to the regulator 8 of the working volume of pump 2, the output parameter of which is the movement f of the lever to change its working volume. The controller 8 is connected to the mechanism 9 for initial tightening of its spring 10 connected to the piston cylinder 11 11. in feedback of the power plant in the form of the shoulders of the Winston bridge connected to the rail movement mechanism 7 and the amplifier 16.

The device works as follows.

With increasing load on the shaft of the motor 5, the pressure P of the working fluid in the pressure line of the pump 2 increases (Fig. 2). This pressure affects the piston-11 regulator

163962

8, causes the displacement lever to change the displacement of the pump 2 if the force exerted on the piston 11 from the pressure is displaced. Nor does it exceed the force of the initial pressing of the spring 10. The working volume of the pump 2 is reduced, ensuring the rotation of the shaft of the hydraulic motor 5 at a lower frequency. If this diesel

0 1 operates at point M (Fig. 4) of the external characteristic, then its power is not fully used. Due to the unbalance of the Winston bridge (FIG. XX) which occurs after moving the lever to change the displacement of the pump and, accordingly, sensor 15, a signal is generated that passes through the amplifier 16, causes the rail displacement mechanism 7 to move; diesel engine 1, and diesel engine 1 goes to work at one of the points of the characteristic of a higher power level.

5 is provided after the feedback from the diesel regulator moves the sensor 14 to a position that provides the balance of the Winston bridge. For the purpose of fixing the range of changes in diesel power, the sensor 14 is provided with a limiter for the limiting output signal.

To change the range of operation of the pump regulator 2, the operator acts through mechanism 9 on the cap 13 of the regulator 8 of pump 2. As a result, the load level on the diesel is determined by the line m; - m; - M.J - m - M S.

Thus, in addition to the effect considered, it is possible to maximize the use of diesel power. Power factor is determined by the ratio

0

the area of fig-ur oJ, M

M 0

5, хУ5 And «Jt, Mf, M, uJ5.

one

It is also possible software-control, for example, from the base computer value useful engine power used by the same algorithm as for the considered version with the operator.

The proposed power unit allows increasing, by eliminating diesel overloads and more fully utilizing its power, the productivity of the machine, for example, an excavator of the III-IV size group, by 10%.

and

-

G //

k

/ 3/2

(9

I T

(rig 2

. J

AND,

li m y

mms

Compiled by V. Ischenko Editor. Bugir Tehred O. Neze,

976/39. Circulation 524Subscribe

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk, Embankment, 4/5

Branch PPP Patent, Uzhgorod, st. Project, 4

01 W, 4/4 5 0) FIG A

Proofreader E. Sirohman

Claims (1)

POWER PLANT, comprising a diesel engine with a speed controller connected to the fuel pump rail through its movement mechanism, a hydraulic drive connected to the diesel shaft and equipped with a pump displacement change regulator, and feedback between the displacement controller and the mechanism. rail movement, characterized in that, in order to increase its reliability by protecting the diesel engine from overloads, it is equipped with a sensor for moving the rail of the fuel pump and a sensor for moving the organ for changing the pump displacement, the sensors being included in the feedback in the form of shoulders of the Winston bridge. © FIG. 1 SU „„ 1216396>