JPS6243080B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a sealing device for a sliding part in a movable vane pump.

[Conventional technology]

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.

[Problem that the invention seeks to solve]

However, in the above-mentioned conventional pump, the operating shaft is long and the control section is provided on the top of the electric motor, which increases the height of the pump above the ground and tends to cause vibrations.
For this reason, there is a drawback that the oil in the impeller boss leaks into the handling liquid or the handling liquid infiltrates into the oil.

An object of the present invention is to apply boss oil to a rotating side member extending from an impeller boss and an impeller boss in a movable vane pump in which an operating mechanism for changing the angular position of a blade is housed in a ball portion or a bell mouth portion of the pump. To provide a shaft sealing device for a movable vane pump that can prevent boss oil from leaking to the handling liquid side or from entering the boss part from the part on which the guiding fixed side member slides. .

[Means for solving problems]

In order to achieve the above object, the present invention has a movable blade supported by an impeller boss connected to a main shaft, an operating rod connected to a piston, and an operating mechanism connected to the operating rod and housed within the impeller boss. In a movable vane pump in which the mounting angle of the movable vane is changed through established,
A slinger is constructed by a member extending between the seal members, one extending from the stationary side member and the other from the rotating side member, and the space between the seal members is divided into two chambers, and the pump that enters this chamber can be handled. The liquid and boss oil are taken out separately.

[Effect]

At least two seal members are provided in the shaft seal portion on which the rotating side member and the stationary side member extending from the impeller boss slide, and a slinger is arranged in the space between these seal members to close the space between the seal members. 2
The pump is divided into two chambers and the pump handling liquid and boss oil are taken out separately, so even if boss oil or handling liquid leaks into the space between the seal members, the boss oil and handling liquid will be removed from the slinger. The boss oil and the handling liquid are respectively taken out separately without being mixed due to the presence of the slinger.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings. In FIG. 1, an impeller boss composed of an impeller hub 3 and an impeller cap 2 is filled with boss oil. A plurality of blades 1 are rotatably attached to the impeller hub 3, and bosses of the blades 1 are connected to an operating rod 7 via a spider 10, a ball joint 9, and an arm 8. The hydraulic cylinder 5 is composed of a main shaft 12 and an impeller hub 3. A piston 6 is housed in the hydraulic cylinder 5, and the hydraulic cylinder 5 is divided into an upper chamber 5a and a lower chamber 5b.
Pressure oil is applied to the upper chamber 5a or lower chamber 5b of the hydraulic cylinder 5, and the operating mechanism that includes the spider 10, ball joint 9, and arm 8 controls the vertical movement of the operating rod 7 and the rotation of the blade 1. Change to exercise. This operating oil passes from the hydraulic system on the ground through pressure oil introduction pipes 14 and 15, passes through a rectifier plate fixed to the bell mouth 11, and then passes through pipes 12 and 1.
3 and is supplied to the upper and lower chambers 5a and 5b of the hydraulic cylinder 5.

The angle of the blade is controlled by comparing the voltage value of the blade angular position detector with the command voltage value coming from the central control panel.
Controlled by a solenoid proportional control valve.

In addition, 4 is a casing of the ball portion, 16 is a boss oil introduction pipe that guides boss oil into the impeller boss, and 17 is a recovery pipe for operating oil and handling liquid.

FIG. 2 is a detailed view of section A in FIG. 1.

In the figure, 2 is an impeller cap, 22 is a seal for preventing liquid handled by the pump from entering, and 23 is a seal for preventing boss oil from entering. A plate 2 extending from the impeller cap 2 (rotating side member) into a chamber partitioned by the two seals 22 and 23.
6 and a plate 27 extending from the rectifying plate (fixed side member) of the bell mouth 11 constitute a slinger. 17a is a boss oil recovery pipe, and 17b is a handling liquid recovery pipe. 25 is a sleeve. The liquid leaking from the seal 22 on the handling liquid side is guided to the recovery pipe 17b side by the slinger plate 26, and the oil leaking from the seal 23 on the boss oil side is guided to the recovery pipe 17a by the slinger plate 27. guided to the side. According to this embodiment, since the liquid handled by the pump and the boss oil are taken out separately, it is also possible to reuse the boss oil that has leaked into the seal portion. FIG. 3 is a detailed view of the slinger part in FIG. Provides a screw sealing effect, making it difficult for handling liquid to mix with boss oil.

〔Effect of the invention〕

As explained above, according to the present invention, at least two seal members are provided in the sliding parts of the stationary side member and the rotating side member, and a slinger is arranged in this space, so that the space between the seal members is divided into two chambers. Since the pump handling liquid and boss oil are taken out separately, there is no risk of boss oil leaking to the handling liquid side from the sliding part between the stationary side member and rotating side member, or handling liquid entering the boss part. This has the effect of reliably preventing infiltration.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of the movable vane pump of the present invention, FIG. 2 is a detailed sectional view of section A in FIG. 1, and FIG. 3 is a detailed sectional view of the slinger part of FIG. 2. 2... Impeller cap (rotating side member), 5... Hydraulic cylinder, 11... Rectifying plate (fixed side member), 17a
...Boss oil recovery pipe, 17b...Handled liquid recovery pipe, 22,
23... Seal, 26, 27... Slinger.

Claims (1)

[Scope of Claims] 1. A movable blade is supported by an impeller boss connected to the main shaft, and the movable blade is supported by an operating rod connected to a piston and an operating mechanism connected to the operating rod and housed within the impeller boss. In a movable vane pump whose mounting angle can be changed, at least two seal members are disposed in the shaft seal portion on which the rotating side member extending from the impeller boss and the stationary side member that guides boss oil to the impeller boss slide, A slinger is formed by a member extending between the seal members, one extending from the stationary side member and the other extending from the rotating side member, and the space between the seal members is divided into two chambers, and the handling liquid of the pump that enters the chamber is divided into two chambers. A shaft sealing device for a movable vane pump, which is characterized by extracting oil and boss oil separately. 2. The shaft sealing device for a movable vane pump according to claim 1, characterized in that a threaded groove is bored on the side of the member extending from the rotating side member constituting the slinger to provide a threaded sealing effect.