JPS63113200A - Pump - Google Patents

Abstract

PURPOSE:To prevent the occurrence of cavitation by applying cylindrical shape to a cover so as not to expose a blade edge to a water flow passage, and opening and closing the port of said passage with the lower side of the cover. CONSTITUTION:A cover 40 is made cylindrical with a hollow part 41 formed therein and a groove 42 is formed thereon for inserting a blade 20. A slide rod 48 is made to slide with an actuator and causes the cover 40 to slide toward the center of the rotation axis thereof. The section of the port of a delivery passage 58 is controlled for opening and closing with the shift of the cover 40, thereby adjusting a water flow rate. According to the aforesaid constitution, the occurrence of cavitation can be prevented without projecting the edge of the blade 20 to a water flow passage.

Description

[Detailed description of the invention] [Industrial application field] The present invention moves a cover by an actuator,
The present invention relates to a pump that freely changes the amount of water delivered by changing the cross section of the water flow path using the cover, and particularly relates to a pump that can prevent the occurrence of cavitation.

[Description of Prior Art] In conventional pumps for water-cooled engines, the maximum water flow of the pump is adjusted to the full-load operating range in which the engine releases the maximum amount of heat, so in the partial-load operating range, more water than necessary is circulated. The drawback was that energy was wasted.

In order to improve this conventional drawback, a system was proposed in which the cover constituting the vortex chamber was moved by a seven-cut unit so that the amount of output from the pump could be freely adjusted. proposed by No. An example of this configuration is shown in cross section in FIG.

Inside the casing 10, there are a fluid inlet 12 and a fluid outlet 14.
A vortex chamber 16 is formed which communicates the two. A rotary shaft 18 is rotatably provided in the casing 10, and the rotary shaft 18 is a vortex-shaped chamber with a zero-rotation shaft 18 that is rotated by a drive means (not shown). On the 6 side, a plurality of blades 20
An impeller 22 integrally formed with is fixed.

A cover 26 is attached to the vane/root wheel 22 so as to be slidable in the direction in which the vanes 20 extend. This cover 26 is integrally formed with an arc-shaped end surface 28 for forming the wall surface of the spiral chamber 16, and a cylindrical skirt portion 30 that slides into contact with the outer edge of the impeller 22 at the outer edge of the arc-shaped end surface 28. This is what I did. A plurality of holes 32 are formed in this arcuate end surface 28, through which the blades 20 are inserted (FIG. 9).
Each blade 20 of the impeller 22 is inserted through this hole 32, and each blade 20 is prevented from coming off from the hole 32 during the stroke of the cover 26.

An actuator 38 is attached to the casing 10, which has a rod 34 fixed to the center of the cover 26, and a rotation holding means 36 that slides the rod 34 while maintaining rotation of the rod 34. This actuator 38 slides the cover 26 via the rod 34 using negative pressure or the like.

In this way, in the conventional system, the cover 26 is moved by the actuator 38 to adjust the effective width of the blades protruding toward the volute chamber 16, thereby adjusting the amount of water delivered in accordance with the operating conditions of the engine, etc. ing.

[Problems to be Solved by the Invention] In the conventional configuration, one blade 20 is connected to the hole 32 of the cover 26.
It protrudes from the vortex chamber 16, which is a water flow path. Therefore, when discharging the maximum flow rate, the protruding width of the blade 20 becomes the maximum and the rotation speed also becomes the maximum.
There was a problem in that cavitation occurred within the spiral chamber 16 due to the influence of the rotation of the tip of the coil.

[Object of the invention] The present invention was made in view of the above points, and the tip of one blade is covered with a cover so that the tip of the blade is not exposed to the water flow path, thereby preventing the occurrence of cavitation. The object of the present invention is to provide a pump according to the present invention.

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a casing having a fluid passage formed therein, and a plurality of vanes attached to a rotating shaft for moving the fluid.

In the pump, the pump includes a cover that slides in the axial direction of the rotating shaft to vary the cross section of the fluid passage, and an actuator that adjusts the amount of movement of the cover, wherein the cover is a cylindrical body having a hollow portion inside. , the hollow part is used as an intermediate path of the fluid passage, a plurality of grooves are formed in the cover into which the blades are inserted, the tips of the blades are housed in the grooves during the entire stroke, and the bottom surface of the cover The cross section of the fluid passage is made variable.

The tip of the blade inserted into the groove inside the cylindrical wall of the cover is
It is always located within the groove of the cover during the entire stroke of the cover. In other words, the tip of the blade does not protrude from the groove,
# Leads to cavitation caused by direct centrifugal force underwater! & I don't listen.

This prevents cavitation due to rotation of the blades.

In order to prevent the tips of the blades from being exposed to the water flow path, the cover is shaped like a cylinder, the hollow part of the cover is used as the flow path, and the opening of the flow path is opened and closed on the lower surface side of the cover.

[First example] Next, the present invention will be explained based on the drawings.

Figures 1 and 2 are cross-sectional views of essential parts of an embodiment of the pump according to the present invention, with Figure 1 showing a state where the water flow is at its minimum, and Figure 2 showing a state where the water flow is close to the maximum. Show, also the third
The figure shows a front view of the cover of FIGS. 1 and 2. In FIGS. 1 and 2, the same reference numerals as in FIG. 8 indicate the same parts.

The cover 40 has a thick cylindrical shape and a plurality of grooves 42 for inserting the blades 20 into the thick wall portion of the cover 40.
The tip of the zero blade 20, on which is formed, is always inserted into this groove 42. The blades 2 of these grooves 42
The tip side of the blade 20 may be closed or open, and as the blade 20 rotates, the cover 40 is also rotated at the same time. A bridge 44 is integrally formed on the end surface of the cover 40 opposite to the opening position of the groove 42. A sliding rod 48 of the actuator is attached to the center of this bridge 44 via a rotation holding means 46 . This sliding rod 48 is slid by an actuator that is operated depending on the operating condition of the engine, and slides the cover 40 in the direction of its rotation center axis. The one-rotation holding means 46 is for rotatably holding the cover 40 with respect to the sliding rod 48, and includes a first play) 50 and a nib plate 52 that sandwich both sides of the cover 40, and these first plays) 50. It also includes a pole 54 interposed between the second plate 52 and the cover 40.

The water flow path formed in the pump body 10 is connected to the cover 4.
a suction passage 56 communicating with the hollow portion 41 of the blade 2;
0 and a discharge passage 58 having an opening perpendicular to the direction in which the blade 20 extends. The opening of the discharge passage 58 is opened and closed by the lower surface of the cover 40.

With the above structure, when the cover 40 is pushed to the maximum toward the impeller 22 as shown in FIG. 1, the discharge passage 58 is closed by the lower surface of the cover 40. Thereafter, as the cover 40 is pulled toward the sliding rod 48, the opening section of the discharge passage 58 is gradually opened (FIG. 2).
That is, the amount of water flowing out can be adjusted as the cover 40 moves. At this time, water from the pump flows through the suction passage 56
The air flows from the base of the five blades 20 to the discharge passage 58 through the hollow portion 41 of the cover 40 .

During the entire stroke of this cover 40, the tip of one blade 20 is always inserted into the groove 42.

Therefore, the tips of the blades 20 do not protrude into the water flow path, and therefore cavitation can be prevented from occurring.

[Second Embodiment] Next, another embodiment of the present invention will be described. FIG. 4 is a sectional view showing another embodiment of the pump according to the present invention, and FIG. 5 is a sectional view of a main part in the direction of arrow A in FIG. 4. The fourth of these
In the figures and FIG. 5, the same reference numerals as in FIG. 1 indicate the same parts. In the embodiment described above, a bridge or a sliding rod is provided at the entrance of the hollow part of the cover, and these act as resistance to the inflow of water. There was a risk. In this example,
The means for sliding the cover is attached to the side of the cover.

In this embodiment, the cover 60 is similar to the previous embodiment.
A plurality of grooves 42 are formed in the grooves 42, and the blades 20 are inserted into the grooves 42.
is always inserted.

An annular recess 62 is formed on the outer periphery of the cover 60.

A rotating shaft 66 of a lever 64 that is swung by an actuator is held in the pump body IO. A rocking body 68 having a bifurcated tip is fixed to the rotating shaft 66, and the rocking body 68 is rocked about the rotating shaft 66 by the operation of an actuator. A pole 7o as shown in FIG. 6 is rotatably attached to each forked tip of the swinging body 68. This pole 7o has cover 6
The pole 7o is mounted in the recess 62 of No. 0, and when the swinging body 68 swings, the pole 7o comes into contact with the wall of the recess 62 and causes the cover 60 to slide. When the pawl 70 comes into contact with the wall of the recess 62, the pawl 70 rotates as the cover 60 rotates, so as not to impede the rotation of the cover 60.

A bearing 72 shown in FIG. 7 may be used in place of the pole 7o shown in FIG. do.

With the above structure, since the means for sliding the cover 60 is provided on the lower surface of the cover 60, there is no need to arrange the cover sliding means in the water circulation path.
Water inflow resistance can be eliminated.

Further, in this embodiment as well, cavitation does not occur because the tip of the blade 20 is housed within 311t42 of the cover 60 as in the previous embodiment.

[Effects of the Invention] As described above, according to the pump according to the present invention, the tips of the blades are inserted into the grooves, and the tips of one blade are not exposed to the water flow path, thereby preventing the occurrence of cavitation. can do.

In addition, since the means for sliding the cover using the actuator is attached to the side of the cover, there is no need to place a means for sliding the cover in the water flow path, reducing water inflow resistance and allowing the cover to move. It can be done smoothly.

Further, since the blades and the grooves of the cover that accommodate the blades are fitted, the shake and vibration of the cover are reduced, and the cover can move smoothly.

[Brief explanation of the drawing]

Figures 1 and 2 are cross-sectional views of essential parts of an embodiment of the pump according to the present invention, with Figure 1 being a cross-sectional view showing a state where the amount of water being conveyed is the minimum, and Figure 2 being a sectional view showing a state where the amount of water being conveyed is close to the maximum. A cross-sectional view showing
3 is a front view of the cover shown in FIGS. 1 and 2, FIG. 4 is a sectional view showing another embodiment of the pump according to the present invention, and FIG. 5 is a direction in the direction of arrow A in FIG. 4. FIG. 6 and FIG. 7 are cross-sectional views of the sliding means housed in the grooves of the cover shown in FIGS. 4 and 5, and FIG. 8 is a cross-sectional view showing a conventional pump. FIG. 10 is a front view of the cover shown in FIG. 9. 10...Casing, 18...Rotating shaft, 20...Blade, 40...
...Cover, 41...Hollow part, 48...
...Sliding rod, 56...Suction passage,
58...Discharge passage, 60...Cover,
62... Concavity. 68... Rocking body, 70... Ball, 72... Bearing. Figure 1 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 9

Claims (2)

[Claims] (1) A casing with a fluid passage formed inside, a plurality of vanes attached to a rotating shaft for moving fluid, and a cover that slides in the axial direction of the rotating shaft to vary the cross section of the fluid passage. and an actuator that adjusts the amount of movement of the cover, wherein the cover is a cylindrical body having a hollow part inside, the hollow part is used as an intermediate path of the fluid passage, and the vane is inserted into the cover. 1. A pump characterized in that a plurality of grooves are formed, the tips of the blades are accommodated in the grooves during the entire stroke, and a passage cross section of the fluid passage is varied on the lower surface of the cover. (2) A patent claim characterized in that the actuator has a rotation means that can rotate in the rotation direction of the cover, an annular recess is formed on the lower surface of the cover, and the rotation means is housed in the groove. The pump according to item 1 in the range of