SU720244A1 - Hydraulic actuator for turning vanes of francis-type water machines - Google Patents

Description

one

The invention relates to hydraulic machine building and can be used in axial vertical hydraulic machines with rotary impeller blades. A servomotor hydraulic drive is known for turning the blades of axial vertical hydraulic machines in which an electrically driven gear wheel is placed inside a bath fixed on the shaft, the two cavities of the pump are connected to the servo motor through the fixture of the blades, and the other two cavities are immersed in the bath with working fluid ij.

A disadvantage of the known device is the operation of the pump in an open cycle, as a result of which the energy of the working fluid from the drain cavity of the impeller servomotor is not used and the working fluid is supplied with a large volume of exchange oil between the oil and hydraulic system, which does not ensure reliable operation of the hydraulic drive.

The aim of the invention is to noBbiuenie efficiency and reliability of the hydraulic drive.

The goal is achieved in that each of the cavities of the spool is connected to two blades of a gear pump of the appropriate pressure, and hydraulic disconnectors are installed in the channels connecting the cavity of the pump to the bath.

This embodiment of the device ensures the use of the energy of the working fluid from the drain cavity of the servomotor and the reduction of the exchange engine in the hydraulic system, which increases its efficiency and reliability.

FIG. 1 schematically shows a hydraulic drive in a section; in fig. 2 - the jib unit (section A-A of FIG. 1).

Hydraulic servomotor reversal

Claims (2)

The 0 blades of the axial vertical hydraulic machines consist of a bath 2 installed on the shaft 1, filled with oil, in which the reverse gear wheel 3 is installed with two high cavities and two low pressure cavities, the function of which varies depending on the direction of rotation of the engine 4. Two cavities of pump 3 connects through hydraulic openers 5 and 6 with balls 7 and 8 installed in them with bath 2, and the other two cavities on which safety valves 9 and 10 are installed are connected through a position lock AND blades of the working coil ENA hydraulic machine (not shown) to the pipes 12 and 13 at KOTopbnvi fed or diverted to a working tepo servomotor turning impeller blades. The hydraulic drive operates as follows. When the pump 3 supplies the working fluid to the cavity 14, the retainer of the position 11 moves to the right and opens the valve 10. The corresponding cavity of the servomotor through the pipe 12, the open valve 1O and the cavity 15 is connected to the suction cavities of the pump 3. Under pressure, the valve 9 opens and the working the body through the pipe 13 enters the working cavity of the servomotor. Since the cavities of the servomotor turn of the impeller blades have different volumes, depending on the direction of the turn of the blades of the impeller, the oil from these cavities is drained into bath 2 or sucked from it by pump 3 through a hydraulic uncoupler. 5 or 6. Under the action of centrifugal force, the balls 7 and 8 are displaced, and the channels of the pump 3 are connected via hydraulic breakers 6 to the bath 2 ,. If a larger volume approaches the aspirating by / usst of pump 3 than the pumped volume of working heat, then the volumes through the breaker 6 are drained into bath 3. When the volume of molten working fluid exceeds pac4eTHbnvt by lifting the ball 8, it overcomes the centrifugal force and closes the channel. Breaker 5 on the side of the discharge with acryt. When the direction of rotation of the vigatel 4 is changed from the discharge side of the pump to the suction side, and the missing volume of the working fluid through the hydraulic breaker 5 comes from the bath 2. The use of the device will allow to reduce electricity consumption and increase the readiness factor for the hydraulic machine. The invention of the hydraulic actuator of the servomotor for rotating the blades of axial vertical hydraulic machines, containing a shaft mounted on the shaft with a working fluid in which a reversible gear pump is installed with at least two cavities of high and low pressure communicated with the bath channels, cavities of high and low pressure, connected to the servomotor of blades turning and with cavities of the gear pump, characterized in that, in order to improve the efficiency and reliability of HocTHf, each of the cavities of the spool, it is connected to two cavities of a gear pump of the appropriate pressure, and hydraulic circuit breakers are installed on the channels connecting the cavities of the pump to the bath. Sources of information taken into account in the examination 1. USSR author's certificate № 264086 ,, class, F 16 H 39/42 1968.