JPH01200097A - Movable vane pump - Google Patents

Abstract

PURPOSE:To permit the water lubrication for an impeller boss and improve reliability by installing a sealing member for partitioning the cylindrical space between a tubular pump main shaft and an operating rod into the upper and lower parts and forming a through hole on the pipe main shaft set between the sealing member and a shaft seal part. CONSTITUTION:A pump main shaft 2 is made in a hollow shape, and an operating rod 3 penetrates through the inside thereof. The upper edge of the operating rod 3 is connected with a vane operating mechanism part 5, and the lower edge is connected with a spider 11. The bearing lubricating water is introduced from a feeding pipe 16 and flows between a protecting pipe 15 and the main shaft 2, and lubricates a submersible bearing 28, and flows into a recovery pipe 17. Into an impeller boss 13, the bearing lubricating water is poured from the small hole 2a on the hollow shaft. The pump main shaft 2 is divided into the upper and lower parts, which are connected by a coupling 18, and a seal 19 and an impeller seal 20 are installed in the shaft joint part of an upper shaft 2U. The bearing lubricating water pressure is set slightly higher than the discharge pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a movable vane pump suitable for an aircraft station where oil spillage is a problem or, conversely, where handling liquid is dirty.

[Conventional technology]

The conventional movable vane pump is 1, for example, Japanese Patent Application Laid-Open No. 56-11059.
As shown in No. 8, the impeller boss was filled with lubricating oil, and there was a risk that the lubricating oil would leak outside in the event of an emergency. In addition, a sealing device as disclosed in Japanese Patent Laid-Open No. 56-148698 has been considered as an improvement plan, but it had the disadvantage of a complicated structure.In order to solve these problems, 186092
A structure has been considered in which no oil is supplied inside the impeller boss as shown in No. 2, but in this case, conversely, if external handling liquid, such as sewage, enters the boss, (a) wear of the impeller seal due to foreign matter may occur. (b) Problems with wear due to foreign matter in the blade operating mechanism, reduction in lubrication performance, reduction in lifespan, and corrosion (c) Problems with lubrication of the operating rod, and insufficient consideration was given to these problems.

[Problem to be solved by the invention]

In the case of oil lubrication, the above-mentioned conventional technology has the problem that there is a risk of oil spillage in the unlikely event that a complicated structure is required to improve this problem. In addition, in the case of an oil-free system, there is a problem in that sufficient consideration must be given to the external liquid to be handled.

The object of the present invention is to solve the above-mentioned problems and provide a movable vane pump that has a simple structure, is highly reliable, and does not have any difficult problems with external handling liquid.

[Means to solve the problem]

The above object is achieved by water lubricating the blade operating mechanism and by introducing clean water into the impeller boss. Furthermore, supplying fresh water to the inside of the impeller boss and improving the performance of the impeller seal can be achieved by making use of bearing lubricating water pressure and making the water pressure inside the impeller boss slightly higher than the discharge pressure.

[Effect]

When applying the above means, the blade operating mechanism is made of a sliding material with good water lubricity, such as Teflon or LBC, to enable water lubrication.

In addition, by using bearing lubricating water and constantly supplying clean water at a pressure slightly higher than the discharge pressure into the impeller boss, it is possible to operate without worrying about replenishing the water in the impeller boss, and the impeller seal is always clean. .

Figure 1 shows a movable vane pump improved by adopting the present invention.
FIG. 1 is a cross-sectional view of the entire structure showing an example.

FIG. 2 is an enlarged detailed view of the ■ part in FIG. 1, and FIG. 3 is an enlarged detailed view of the top.

The pump main shaft 2 is hollow, and the operating rod 3 passes through it. The upper end of the operating rod 3 is connected to the wing operating mechanism section 5, and the lower end is connected to the spider 11 (see FIG. 2).

A mechanical seal 14 is arranged at the lower end of the pump main shaft 2 to seal the pump bearing lubricating water.

making collection possible. Bearing lubricating water enters from the supply pipe 16, flows between the protection pipe 15 and the main shaft 2, and is supplied to the underwater bearing 28.
It lubricates and flows into the recovery pipe 178. (See Figure 2)
Bearing lubricating water is injected into the impeller boss 13 from a hollow shaft small hole 2a, which will be described later with reference to FIG.
The link mechanism in 3 will be explained. The operating rod 3 is moved up and down by the operation of the blade operating mechanism section 5 described above. Spider 11 moves this up and down. Ball joint 9. This is converted into rotational motion of the impeller via a link mechanism composed of the arm 12 and the arm 12, and the blades are opened and closed. This link mechanism is configured to slide using, for example, a Teflon-based bearing, a water-lubricable sliding material such as LBC, or synthetic resin.

Next, the water injection part for the water inside the impeller boss will be explained using FIG.

A small hole 2a is provided in the pump lower shaft 2D.

A seal 19 is provided at the shaft joint of the upper shaft 2U.

Now, when the bearing lubricating water pressure is set slightly higher than the pump discharge pressure, a portion of the lubricating water passes through the small hole 2a and fills the impeller boss, and the impeller boss internal water pressure becomes slightly higher than the pump discharge pressure. At this time, a small amount of lubricating water leaks from the impeller seal 20. Therefore, even if the external liquid to be handled is contaminated, the interior of the impeller boss is always kept clean.

Also, because there is a pressure difference, external water does not enter the interior.
A highly reliable seal can be obtained.

A small amount of leakage from this impeller seal will occur during operation.
Bearing lubricating water is always available, so there is no need to worry about replenishing it.

As explained above, in this embodiment, (1) a water-lubricated blade operation mechanism is obtained that does not require maintenance such as water replenishment in the boss.

(ii) The reliability of the impeller seal is improved and there is no infiltration of external water into the impeller boss.

The following effects were confirmed.

〔Effect of the invention〕

As explained above, the movable vane pump of the present invention has (a)
Since a portion of the bearing lubricating water is supplied into the impeller boss, a water-lubricated blade operation mechanism that requires no maintenance is possible.

(b) Make the water pressure inside the boss higher than the discharge pressure.

There is no intrusion of external water, and the inside of the boss and the impeller seal can always be kept clean.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the entire structure of an embodiment of the present invention. FIG. 2 is a detailed view of the ■ part, and FIG. 3 is a detailed view of the ■ part. 2... Pump main shaft, 3... Operating rod, 4... Impeller hub, 5... Blade operating mechanism section, 6... Impeller vane, 9... Ball joint, 11... Spider, 12... Arm, 14... Mecha seal, 15.
...hogokan, 16...supply pipe, 17...recovery pipe,
19...Seal. Condolences /I! J

Claims (1)

[Scope of Claims] 1. (a) a casing having a vertical cylindrical or conical portion; (b) a protective tube concentrically and fixedly supported within the vertical cylindrical or conical portion; c) a pump main shaft which is a tubular rotating member disposed concentrically within the protection tube; (d) an operating rod inserted into the pump main shaft; (e) fixed to the pump main shaft; an impeller hub supporting an impeller vane; (f) an impeller cap covering the lower end of the impeller hub and forming an impeller boss therein; and (g) an underwater bearing near the lower end of the pump main shaft. (h) the vicinity of the lower end of the pump main shaft is sealed to the protective tube, and (i) the pump main shaft is passed through the gap between the protective tube and the pump main shaft to In a movable vane pump with a structure that supplies and circulates shaft water lubricating water to submerged bearings, (
j) A seal member is provided in at least one location to partition the cylindrical space formed between the pump main shaft and the operating rod into upper and lower parts, and the seal member is located between the seal part and the shaft seal part, A movable vane pump characterized by having a through hole in the pipe wall of the main shaft. 2. The movable vane pump according to claim 1, wherein the pressure of the bearing lubricating water is set higher than the discharge pressure of the movable vane pump.