JPS6219600B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a movable blade mixed flow pump, and more particularly to a device for protecting sliding parts based on shaft vibration.

In conventional movable blade mixed flow pumps, the impeller boss, which is sealed from the outside, is filled with oil, and contains the crosshead and connecting shaft that transmit the reciprocating motion of the operating shaft to the rotational motion of the blades. There is. This operating shaft passes through a hollow main shaft and is connected to a piston in an upper hydraulic cylinder. Furthermore, the electric motor shaft above the hydraulic cylinder is also formed hollow, and through this is an operating oil passage that connects the upper and lower sides of the hydraulic cylinder, respectively, and is connected to these passages from a control section provided above the electric motor. A device for supplying operating oil and a device for feedback control of the position of the hydraulic piston are arranged. With this structure, the mechanism that transmits the reciprocating motion of the operating shaft to the rotary motion of the blades is housed inside the oil-filled impeller boss, so there is less rust and foreign matter, and each sliding part is lubricated. Are better. However, since the operating shaft is long and the main shaft and electric motor need to be hollow shafts, manufacturing and assembly are not easy and the cost is high.In addition, the control section is installed on the top of the electric motor, which increases the height of the pump from the ground. There were problems such as easy vibration.

For this reason, there was a risk that the oil in the impeller boss would leak into the handling liquid, or that the handling liquid would intrude into the oil.

An object of the present invention is to provide a movable blade mixed flow pump in which an operating mechanism for changing the opening position of the blades is housed in a bell-shaped suction port below the impeller. To obtain a movable blade mixed flow pump capable of reliably sealing this part by reducing the load.

The present invention is characterized by comprising a stationary operating shaft having one end fixed to a piston housed in a hydraulic cylinder and the other end extending within an impeller boss that is attached to a main shaft and rotates together with the main shaft; A movable blade mixed flow pump comprising a shaft sleeve attached to the impeller boss inlet portion of the operating shaft and a sealing device disposed between the shaft sleeve and the impeller boss, the shaft sleeve and the hydraulic cylinder being built in. A flexible body is installed between the hydraulic cylinder chambers so as to surround the stationary operating shaft.

Embodiments of the present invention will be described in detail below with reference to the drawings. In FIG. 1, a hydraulic cylinder chamber 4 containing a hydraulic cylinder 3 fixed by a plurality of rectifying plates 2 is attached to a bell-shaped suction port 1 .
This hydraulic cylinder 3 houses a piston 5, and a stationary operating shaft 7, which has one end fixed to the piston 5 and a connecting portion 6 formed at the other end above, is supported and arranged by bearings 8 and 9. ing. A rotary operating shaft 13, which is slidably supported by an impeller boss 11 attached to a main shaft 10 via a bearing 12, is supported on the continuous portion 6 of the stationary operating shaft 7 via a thrust bearing 14. A plurality of blades 15 are rotatably attached to the impeller boss 11, and the boss 15a of the blades 15 is connected to a crosshead 16 fixed to the rotary operation shaft 13, a connecting shaft 17, and a lever 18. . Reference numeral 19 denotes a guide vane that guides the water sent out from the vane 15 in the axial direction. Impeller boss 11
A plurality of through holes 20 are bored therein, extending from the uppermost end of the lower end to the top of the shaft end of the rotary operation shaft 13, and a through hole 22 that communicates with the uppermost end of the rotary operation shaft 13 through a through hole 21 bored in the axial center of the rotary operation shaft 13. into the center of the stationary operation shaft 7,
A passage for taking out the residual air in the impeller boss 1 is formed by guiding the through hole 22 to the outside through a hole 24 made in the rectifier plate 2 by a flexible tube 23. In addition, the upper and lower parts of the hydraulic cylinder 3
Pressure oil pipes 25 and 26 for supplying pressure oil to a and 3b are also guided to the outside through holes 24 in the baffle plate 2 and communicated with a hydraulic control device (not shown) provided on the ground. The figure shows the parts in a balanced position. In this state, when pressure oil is sent from the pressure oil pipe 25 to the lower part 3a of the hydraulic cylinder 3, the piston 5 is pushed upward. Therefore, the oil in the upper part 3b of the hydraulic cylinder 3 is returned to the hydraulic control device (not shown) via the pressure oil pipe 26. The movement of the piston moves the stationary operating shaft 7 upward and is transmitted to the rotating operating shaft 13 via the power bearing 14, and the crosshead 16 fixed to this operating shaft 13 moves correspondingly, and the connecting shaft 17 and lever 18 The setting of the angular position of the vane 15 is changed via. Conversely, when pressure oil is sent into the pressure oil pipe 26, it moves in the opposite direction to the above in the same procedure as the above operation. Therefore, the pressure oil pipe 25 or 2 is controlled by the hydraulic control device.
By feeding an appropriate amount of pressure oil into the piston 6, the blades can be opened and closed as desired within the stroke range of the piston.

FIG. 2 shows the gist of the present invention, and is an enlarged detailed view of the connection point between the impeller boss 11 and the hydraulic cylinder chamber 4 shown in FIG. 1.

In the figure, one end of the stationary operating shaft 7 is fixed to a piston contained within a hydraulic cylinder, and the other end is disposed extending within an impeller boss 11 that rotates together with the main shaft. A shaft sleeve 27 is attached to the stationary operating shaft 7 at the entrance of the impeller boss 11, and a sealing device 28 such as a mechanical seal is disposed between the shaft sleeve 27 and the impeller boss 11. A flexible body 29, such as a bellows, is arranged between the shaft sleeve 27 and the hydraulic cylinder chamber 4 containing the hydraulic cylinder so as to surround the stationary operating shaft 7.

With the above configuration, even if the impeller boss 11 vibrates during rotation, the shaft sleeve 27 moves following the vibration of the impeller boss due to the elasticity of the flexible body 29, so that the sealing device 28, such as a mechanical seal, can slide easily. The vibration load applied to the parts can be reduced.

As explained above, according to the present invention, since the flexible body is attached between the shaft sleeve and the hydraulic cylinder chamber containing the hydraulic cylinder so as to surround the stationary operating shaft, the vibration load applied to the sliding part is reduced. This has the effect of providing a movable blade mixed flow pump that can reduce the amount of heat and seal the sliding portion reliably.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of the movable blade mixed flow pump of the present invention, and FIG. 2 is a sectional view of the sliding part of FIG. 1. 4... Hydraulic cylinder chamber, 7... Stationary operating shaft, 1
1... Impeller boss, 27... Shaft sleeve, 28...
...Sealing device, 29...Flexible body.

Claims (1)

[Claims] 1. A stationary operating shaft having one end fixed to a piston housed in a hydraulic cylinder, the other end attached to a main shaft, and extending within an impeller boss that rotates together with the main shaft, and the vane of the stationary operating shaft In a movable blade mixed flow pump comprising a shaft sleeve attached to the inlet of the car boss, and a sealing device disposed between the shaft sleeve and the impeller boss, there is a space between the shaft sleeve and the hydraulic cylinder chamber containing the hydraulic cylinder. A movable blade mixed flow pump, characterized in that a flexible body is attached to surround the stationary operating shaft.