JPH0830478B2 - Movable vane pump and its performance adjusting method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a movable blade pump and a method of adjusting the performance thereof, and more particularly, to a movable blade suitable for performing performance adjustment by changing a gear cup according to a blade opening. The present invention relates to a blade pump and a method for adjusting its performance.

[Prior Art] In a conventional general movable vane pump, the outer diameter of the impeller vane and the casing liner are spherically machined to change the blade opening, and even if the blade opening is changed, the impeller vane and the casing liner are changed. It was not possible to gradually change the gearup with.

Further, for example, Japanese Utility Model Laid-Open No. 62-8393 discloses a dry operation in which a groove is provided so that the tip of the blade does not come into contact with the impeller casing or the casing liner when the blade is rotated with the blade angle minimized. A movable vane pump is disclosed.

The technique is operated with a minimum blade angle in anhydrous operation in which the pump is operated to prepare for drainage before water arrives, for example, in the event of stormy weather, but vibration is large and the blade tip has a casing liner. Therefore, the groove is used to expand the gear cap to enable a dry operation, and in addition, foreign matter is prevented from being clogged.

[Problems to be Solved by the Invention] In a conventional general movable blade pump, the gear gap between the impeller vane and the casing liner is constant, and the gear gap is narrowed near the blade full opening to perform efficient operation. It was not possible to adjust the performance by gradually expanding the gear up from the intermediate opening to near fully closed to obtain stable characteristics.

Further, the movable vane pump described in Japanese Utility Model Laid-Open No. 62-8393 is intended for dry operation and prevention of foreign substances from clogging, and does not continuously change the gear up in accordance with changes in the blade opening. No consideration was given to performance adjustment to obtain stable characteristics.

The present invention has been made to solve the above-mentioned problems in the prior art, and a movable blade capable of continuously adjusting the performance by continuously changing the gear gap between the impeller vane and the casing liner according to the blade opening (blade angle). It is an object of the present invention to provide a pump and a method for adjusting its performance.

[Means for Solving the Problems] In order to achieve the above object, the structure of the movable vane pump according to the present invention includes an impeller vane in a casing liner, and a stem shaft of the impeller vane is connected to an impeller hub via a stem bearing. In a movable vane pump, which is rotatably supported by the stem shaft and is connected to a movable vane mechanism, a curved surface of a tip portion of the impeller vane directly faces a casing liner with a gap maintained between the impeller and the impeller. The gap between the tip of the impeller vane and the inner surface of the casing liner is continuously changed in accordance with the change of the blade opening of the impeller vane over at least the intermediate opening position to the minimum angular position of the vane opening. The recess is formed deeper than the inner peripheral surface of the casing liner.

Further, the method for adjusting the performance of the movable vane pump according to the present invention is
An impeller vane is provided in the casing liner, the stem shaft of the impeller vane is rotatably supported by an impeller hub via a stem bearing, and the stem shaft connected to the movable blade mechanism is rotated to change the blade opening. In the blade pump performance adjusting method, the pump performance is adjusted by continuously changing the gear gap between the impeller vane tip and the inner peripheral surface of the casing liner according to the change in the blade opening of the impeller vane. ing.

[Operation] The concept of developing the present invention and the operation of the above technical means will be described below.

Generally, the narrower the gap between the impeller vane and the casing liner, the better the pump efficiency. When the blade opening of the impeller vanes, that is, the blade angle (blade angle) is changed, a pump performance curve is obtained for each. Now, when the flow rate Q is taken as the horizontal axis and the total head H is taken as the vertical axis, a pump performance curve for each blade opening is obtained (not shown), and a smooth curve to the right is the stable characteristic, and It is an unstable property that a state or a protrusion appears. Narrowing the gears tends to cause this instability.

In the present invention, when the blade opening is close to full opening, the gear cup is narrowed to improve pump efficiency, and when the opening is equal to or less than the intermediate opening where unstable characteristics are likely to occur, the gear cup is gradually widened to reduce the impeller vane outer diameter and the casing liner. It is possible to adjust the performance by, for example, creating a leak flow between the two and improving the unstable characteristics.

[Embodiment] Each embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

FIG. 1 is a detailed sectional view of an impeller vane and a casing liner portion of a movable vane pump according to an embodiment of the present invention.
The figure is a vertical cross-sectional view of the movable vane pump bowl portion.

In FIG. 2, 1 is an impeller vane that is a blade of a movable blade, 2 is a stem shaft of the impeller vane, 3 is an impeller hub, 4a and 4b are stem bearings that rotatably support the stem shaft 2 on the impeller hub 3, 5 is an arm, 6 is a ball joint, 7 is a spider, 8 is an operating rod, 9 is a main shaft of a movable vane pump, and this main shaft 9 is a hollow shaft.
The arm 5, the ball joint 6, the spider 7, and the operation rod 8 constitute a movable wing mechanism.

 10 is a casing liner.

The impeller vane 1 is rotatably supported by stem bearings 4 a and 4 b fitted to the impeller hub 3. An arm 5 is fitted on the stem shaft 2 of the impeller vane, and is connected to an operation rod 8 via a ball joint 6 and a spider 7. The operating rod 8 penetrates through a hollow main shaft 9 and is connected to a wing operating mechanism (not shown) on the ground. The operating rod 8 is moved up and down by a wing operating mechanism, and this up and down movement is exchanged for rotary motion (opening and closing of the wing) of the impeller zone 1 via the spider 7, the ball joint 6 and the arm 5.

In addition, in order to make the impeller vanes 1 rotatable in this way, the outer diameter of the impeller vanes 1 and the inner surface of the casing liner 10 are spherical.

Therefore, in the conventional movable blade pump, the gear gap between the curved surface at the tip of the impeller vane 1 and the inner peripheral surface of the casing liner 10 was always constant even if the blade opening was changed.

FIG. 1 shows a cross section of an impeller vane and a casing liner portion of the movable vane pump of this embodiment.

The casing liner 10 is formed with an inner peripheral surface 10a of a spherical surface which directly opposes the curved surface of the tip end portion of the impeller vane 1 while maintaining an appropriate gear, and the radius of the spherical surface and the curved surface of the center position are eccentric. The inner peripheral surface 10a has a recess 11 deeper than the inner peripheral surface 10a. More specifically, as shown in FIG. 1, the recess 11 is formed over the range of at least the intermediate opening position to the minimum angular position of the blade opening of the impeller vane 1.

In the fully open position, the impeller vanes 1 are shown in FIG.
1a, the inner and outer peripheral surfaces 10a
Since the gear cap is formed, efficient operation can be performed without being significantly affected by the recess 11.

Generally, in the conventional movable blade pump, unstable characteristics are likely to appear from the blade intermediate opening to the minimum angle, and a problem may occur in relation to the operating range of the pump.

In this embodiment, the intermediate opening position indicated by the one-dot chain line in FIG.
From 1b to the minimum angular position 1c shown by the broken line, the outer diameter of the impeller vanes faces the concave portion 11, and the gear cups are continuously expanded as the blade is closed. For this reason, at an intermediate opening or less, the leakage flow between the tip of the impeller vane 1 and the inner surface of the casing liner 10 increases,
Unstable characteristics are less likely to appear.

According to this embodiment, the tip of the impeller vane 1 and the casing inner surface 10a of the casing liner are continuously changed according to the blade angle (blade opening), so that the performance is adjusted so that the unstable characteristic does not occur. It is possible to do.

It is also expected that a secondary effect that foreign substances can be automatically prevented during operation according to the change in the gearup.

Next, FIG. 3 is a detailed sectional view of an impeller vane and a casing liner portion of a movable vane pump according to another embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 1 are the same parts as those in the previous embodiment, and therefore their explanations are omitted.

In the embodiment of FIG. 3, the concave portion of the casing liner inner peripheral surface 10a is formed by shaving the groove 12 in an obtuse angle shape with the deepest portion as the apex with respect to the spherical surface of the casing liner inner peripheral surface.

In this way, the blade opening and the gear cup can be changed almost proportionally. Further, it is possible to perform optimum performance adjustment by changing the depth and width of the recess (groove) as necessary.

Next, FIG. 4 is a detailed sectional view of an impeller vane and a casing liner portion of a movable vane pump according to still another embodiment of the present invention, and FIG. 5 is a detailed sectional view of a stem bearing portion of FIG. 4A. It is a figure.

In the embodiment shown in FIGS. 4 and 5, the stem shaft 2A is provided with a male screw 2b relating to the screw feeding means, and the stem bearing 4B is provided with a female screw 4c relating to the screw feeding means, and the impeller according to the change of the blade opening of the impeller vane 1 is provided. The vane 1 is designed to move in and out in the stem axis direction indicated by the arrow.

In this way, the gear cup can be continuously changed as the blade is opened and closed, and the performance of the movable blade pump can be adjusted with a simple structure, and the same effects as those of the above-described respective embodiments can be obtained. Be expected.

In addition, in each of the above-described embodiments, an example in which the inner peripheral surface of the casing liner is a spherical surface has been described, but the present invention is not limited to this.

As described above, according to the present invention, the blade opening (blade angle)
According to the above, it is possible to provide a movable blade pump whose performance can be adjusted by continuously changing the gear gap between the impeller vane and the casing liner, and a method for adjusting the performance thereof.

[Brief description of drawings]

FIG. 1 is a detailed sectional view of an impeller vane and a casing liner portion of a movable blade pump according to an embodiment of the present invention, FIG. 2 is a vertical sectional view of a movable blade pump bowl portion, and FIG. An impeller vane of a movable vane pump according to another embodiment of
4 is a detailed cross-sectional view of the casing liner portion, FIG. 4 is a detailed cross-sectional view of the impeller vane of the movable vane pump according to yet another embodiment of the present invention, the casing liner portion, and FIG.
It is a detailed sectional view of the stem bearing part of the portion A of FIG. 1 …… impeller vane, 2,2A …… stem shaft, 2b …… male thread, 3 …… impeller hub, 4a, 4b, 4B …… stem bearing, 4c
...... Female thread, 5 ...... arm, 6 ...... ball joint,
7 ... Spider, 8 ... Operation rod, 10 ... Casing liner, 10a ... Inner surface, 11 ... Recess, 12 ... Groove.

Claims (5)

[Claims] 1. A movable vane pump comprising an impeller vane in a casing liner, a stem shaft of the impeller vane being rotatably supported by an impeller hub via a stem bearing, and the stem shaft being connected to a movable vane mechanism. The curved surface of the tip end portion of the impeller vane directly faces the inner peripheral surface of the casing liner while maintaining a gap, over the range of at least the intermediate opening position to the minimum angular position of the blade opening of the impeller vane, A movable blade pump, wherein a concave portion for continuously changing a gap between the tip end portion of the impeller vane and an inner surface of the casing liner is formed deeper than an inner peripheral surface of the casing liner according to a change in blade opening. 2. The casing liner inner peripheral surface according to claim 1, wherein the concave portion of the inner peripheral surface of the casing liner has a gap between the inner peripheral surface of the casing liner and a tip portion of the impeller vane. A movable vane pump, which is formed by cutting into a curved surface having a radius of curvature different from that of the above. 3. The casing according to claim 1, wherein the recess on the inner peripheral surface of the casing liner has a deepest portion with respect to the inner peripheral surface of the casing liner having a gap between the inner peripheral surface and the tip of the impeller vane. A movable vane pump characterized by being formed by shaving an obtuse angled groove at the apex. 4. A movable vane pump comprising an impeller vane in a casing naylor, a stem shaft of the impeller vane being rotatably supported by an impeller hub via a stem bearing, and the stem shaft being connected to a movable vane mechanism. The stem shaft of the impeller vane and the stem bearing are provided with screw feeding means, and the gap between the tip end of the impeller vane and the inner peripheral surface of the casing liner is continuously changed according to the change of the blade opening of the impeller vane. The movable vane pump, wherein the impeller vanes move in and out in the stem axial direction so as to allow the impeller vanes to move in and out. 5. A casing liner is provided with an impeller vane, a stem shaft of the impeller vane is rotatably supported by an impeller hub via a stem bearing, and the stem shaft connected to a movable blade mechanism is rotated to open the blade. In a method for adjusting the performance of a movable vane pump that changes the degree of pump performance, the gap between the tip of the impeller vane and the inner peripheral surface of the casing liner is continuously changed according to the change in the blade opening of the impeller vane to improve the pump performance. A method for adjusting the performance of a movable vane pump, which comprises performing adjustment.