JPS6010194B2 - moving vane mixed flow pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a movable blade mixed flow pump in which an operating mechanism for changing the angular position of a blade is housed in a bell-shaped suction port below an impeller.

A conventional movable blade mixed flow pump is constructed as shown in FIGS. 1 and 2.

That is, the impeller boss 1, which is sealed from the outside, is filled with oil, which transmits the reciprocating motion of the operating shaft 2 to the rotational motion of the blades 3, as shown in an enlarged view in FIG. It contains a crosshead 4, a connecting shaft 5, and a lever 6.
This operating shaft 2 passes through a hollow main shaft 7 and is connected to a piston 9 in an upper hydraulic cylinder 8. Further, the shaft of the electric motor 10 located above the hydraulic cylinder 8 is also formed hollow, through which operating oil passages that carry the upper and lower sides of the hydraulic cylinder 8 are respectively connected, and a control section provided above the electric motor 10 is provided. A device for supplying operating oil from 11 to these passages and a device for feedback controlling the position of the hydraulic piston are arranged. In addition, 12 is a guide blade, 13
14 is a pump casing, and 14 is a discharge casing. In this structure, the mechanism that transmits the reciprocating motion of the operating shaft 2 to the rotational motion of the blades 3 is housed in the oil-filled impeller boss 1, which reduces the occurrence of rust and contamination of foreign matter, and prevents the movement of each tank moving part. It also has excellent lubricity.

On the other hand, since the operating shaft 2 is long and the main shaft 7 and the electric motor 10 need to be hollow shafts, manufacturing and assembly are not easy and the cost is high.Also, since the control section 11 is provided on the top of the electric motor 10, the pump can be mounted on the ground. There were problems such as the high height and the tendency to cause vibrations. For this reason, this type of movable vane pump has conventionally been used almost exclusively for large pumps. The purpose of this invention is to locate a chamber containing an operating mechanism for changing the angular position of the impeller in the bell-shaped suction port below the impeller, thereby facilitating the manufacture, assembly, and disassembly of pumps and electric motors, and to facilitate the manufacture, assembly, and disassembly of pumps and electric motors. The present invention provides a movable blade mixed flow pump with an improved suction flow path.

In order to achieve the above object, this invention has a hydraulic cylinder chamber formed in a conical shape, which includes a hydraulic cylinder fixed by a plurality of rectifier plates in a bell-shaped suction port below the impeller, and a hydraulic cylinder chamber enclosed in the hydraulic cylinder. a stationary operating shaft having one end fixed to the piston and forming a connecting portion at the upper end of the shaft; and a stationary operating shaft supported via a bearing by the connecting portion of the stationary operating shaft and attached to the main shaft and rotating together with the main shaft. The "pump main shaft" consists of a rotary operation shaft connected to the impeller post, a blade rotatably supported by the impeller boss, and a control mechanism that converts the vertical movement of the blade shaft and rotary operation shaft into rotation of the blade. The electric motor is made of a solid piece to facilitate disassembly.In addition, a conical hydraulic cylinder chamber is placed in the bell-shaped suction port to prevent swirling and turbulence of the flow flowing into the suction port. This technology takes technical measures to rectify the current.

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIG.

In the figure, a hydraulic cylinder chamber 8 containing a hydraulic cylinder enclosure fixed by a plurality of rectifying plates 6 is attached to the bell-shaped suction port 5.

This hydraulic cylinder 17 contains a piston turtle 9. One end of this piston 9 is fixed and a connecting portion 20 is formed at the upper end of the stationary operating shaft 2. More supported and placed. The connecting part 2 of the stationary operating shaft 2 supports the rotary operating shaft 27, which is supported through the impeller boss 2SI mounted on the main shaft 2 through the bearing 26, through the thrust bearing 2 fin. There is. A plurality of blades 29 are rotatably attached to the impeller boss 2, and a boss 29a of the blades 29 is connected to the rotary operation shaft 27 via a control mechanism fixed to it. This control mechanism is composed of a crosshead 38 and a connecting shaft triple lever S2. 33 is a guide vane that guides the water sent out from the vane 29 in the direction of the water.

A plurality of through holes 34 are bored in the impeller boss 25 toward the uppermost end of the lower end and the top of the track end of the rotary operating shaft 27. A through hole 36 to be passed through is bored in the 0 part of the double stationary operating shaft, and this through hole 38 is connected to the steerable tube 371.
The impeller boss 25 is configured to lead to the outside through the impeller boss 25.
A passage for taking out the residual air inside is formed. In addition, the pressure oil pipes 39 and 40 that supply pressure oil to the upper and lower turtles 7a and the wings 7M of the hydraulic cylinder i7 are also led to the outside through the holes 38 in the baffle plate 16, and are connected to a hydraulic control device installed on the ground. (not shown).The impeller boss 25 and the hydraulic cylinder chamber 1
8 is filled with oil, and the Fujitsugu parts of both are sealed against external water by a sealing device 48' such as a mechanical seal.
The diagram shows the parts in proportion and position.
In this state, when pressure oil from the oil pipe 39 is fed into the lower part of the hydraulic silling turtle 7, the piston turtle 9 is pushed upward. Therefore, the oil in the upper barrel b of the hydraulic cylinder 17 is returned to the hydraulic control device (not shown) through the pressure oil pipe 4. The movement of the piston moves the stationary operating shaft 21 upward and is transmitted to the rotary operating shaft 2 through the thrust bearing, and the crosshead 30 fixed to this operating shaft 27 moves correspondingly, and the connecting shaft 31 ``The setting of the angular position of the vane 29 is changed via the lever 82.

Conversely, when pressure oil is fed into the pressure oil pipe 40, it moves in the opposite direction in the same manner as above. By feeding, the blades can be opened and closed arbitrarily within the stroke range of the piston.On the other hand, when starting the pump, the residual air accumulated at the lower end of the impeller boss 25 passes through the through hole 34 to the air reservoir at the upper end of the rotary operation shaft 27. The air reaches the inside of the through hole 3 by connecting the flexible tube 37 to an external suction device such as a vacuum pump (not shown).
It can be allowed to escape to the outside through the pipe 36. To monitor the blade angle, a device that detects the vertical movement of the stationary operating shaft, such as a potentiometer, is installed in the hydraulic cylinder.The output signal of the potentiometer can be used to display the blade angle and to feedback control the blade angle. . In this way, by detecting the displacement of the operating shaft in the vertical direction, it is possible to monitor the operating state and automatically control operation according to the required value of the pump output. Since it is built into the conical hydraulic cylinder chamber located at the bell-shaped suction port below the impeller, normal solid shafts can be used for the pump main shaft and motor shaft, making it easy to manufacture, assemble, and disassemble the pump and motor. becomes easier, and
The swirling and turbulence of the flow flowing into the suction port is rectified by the conical hydraulic cylinder chamber and a plurality of rectifying plates that fix the hydraulic cylinder chamber, allowing a uniform flow to be guided to the blades.

[Brief explanation of drawings]

FIG. 1 is a partially sectional front view of a conventional movable vane mixed flow pump, FIG. 2 is an enlarged sectional view of the movable vane portion of FIG. 1, and FIG. 3 is a sectional view of essential parts of the movable vane mixed flow pump of the present invention. It is. 15... Bell-shaped suction port, 16... Current plate, 17
... Hydraulic cylinder, 18 ... Hydraulic cylinder chamber, 19 ... Piston, 20 ... Connection section, 21 ... Stationary operation shaft, 24 ... ...main axis,
25... Impeller boss, 27... Rotating operation shaft, 29... Vane, 30... Cross head, 31... Connection shaft, 32 ...Lever, 34, 35, 36...Through hole. Tsutomu's figure 2 figure 3 figure

Claims (1)

[Claims] 1. A hydraulic cylinder chamber formed in a conical shape and containing a hydraulic cylinder fixed by a plurality of rectifying plates in a bell-shaped suction port below the impeller, a piston housed in the hydraulic cylinder, and one end attached to the piston. a stationary operating shaft having a fixed portion and a connecting portion formed at the other upper end; and a rotating impeller boss that is supported via a bearing by the connecting portion of the stationary operating shaft and that is attached to the main shaft and rotates together with the main shaft. operating axis,
comprising a blade rotatably supported by the impeller boss, and a control mechanism that connects the shaft of the blade and the rotational operation shaft to convert vertical movement of the rotational operation shaft into rotation of the blade, A movable blade mixed flow pump characterized in that the impeller boss is sealed against external liquid to prevent intrusion of external liquid.