JPS63150039A - Low speed rotary apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a low-speed rotation mechanism that is installed at a blow-off port of a bubble bath or the like and swings the blow-out flow at a low speed using the energy of the fluid itself.

2. Description of the Related Art A conventional flow blowing device using a low-speed rotating device is shown in FIG. In the figure, 1 is a flow path, 2 is a wall that constitutes the flow path 1,
3 is a water wheel that rotates with the energy of the flow, 4 is the shaft of the water wheel 5
6 is a gear (1) integrated with the shaft 5 of the water turbine, 7 to 10 are a group of reduction gears that reduce the rotation of the gear (1), and 11 is a bearing (1) that supports the gear 10. 2), 10
12 is a nozzle having a throttle 12a, and 13 is a guide wall that gradually expands toward the downstream. The rotational force of the water turbine 3 rotated by the flow is reduced by the gear groups 7 to 10, causing the shielding plate 11 to rotate at a low speed. On the other hand, the flow is deflected at a wide angle toward the shielding plate 11 by the deflection portions 11 to 13. (Japanese Unexamined Patent Publication No. 138995/1983).

As described above, since the shielding plate 11 is rotating at a low speed, the flow swings in all directions in response to the rotation of the shielding plate 11. The reason why a low-speed rotation mechanism is necessary here is that if the rotation of the water turbine is directly transmitted to the shielding plate 11,
This is because the shielding plate rotates before the deflection operation is performed, making it impossible to perform the swing operation. Further, even if the deflection action can be performed, the swing is too fast and a comfortable swing state cannot be achieved.

Problems to be Solved by the Invention In the conventional example described above, the structure is complicated due to the use of multiple gears, and the static friction caused by the large number of bearings is large, so the water turbine does not start rotating at low flow rates. . Furthermore, since the rotational speed increases in proportion to the flow rate, there is a problem in that when the flow rate is large, the swing speed also increases, making it uncomfortable.

The present invention solves these conventional problems, and has a simple structure, can start even at low flow rates, and suppresses the increase in rotational speed to a small extent even at high flow rates.

Means for Solving the Problems In order to solve the above problems, the low speed rotating device of the present invention has the following features:
an impeller provided in a flow path and rotated by the energy of the fluid flowing through the flow path; a rectifying member provided downstream of the impeller for removing swirling components of the flow generated by the impeller; and a fluid damper provided downstream of the flow regulating member, the fluid damper having at least one protrusion that rotates as a shaft.

Function: With the above-described configuration, the rotational force generated by the impeller is suppressed by the fluid damper, resulting in low-speed rotation. At this time, the rectifying member acts to prevent the fluid damper from rotating due to the swirling flow generated by the impeller. As a result, at the time of startup, the number of bearings is small, so the static friction is small, and the rotational resistance of the fluid is almost zero, so the impeller rotates even at a low flow rate. When the flow rate increases and the rotational speed of the impeller increases, the rotational resistance of the fluid increases in proportion to the square of the speed, that is, the square of the rotational speed, suppressing an increase in the rotational speed. Therefore, even if the flow rate increases significantly, the rotational speed increases little, and a comfortable swinging motion is maintained.

Example Embodiments of the present invention will be described below with reference to the accompanying drawings.

In FIGS. 1 and 2, C114 is a flow path, and 15 is a flow path 14.
16 is an impeller (water wheel) that rotates by the energy of the fluid; 17 is a bearing that supports the impeller shaft 18; 19 is a rectifying member that returns the swirling flow generated by the impeller 16 to the original flow; It consists of a disk with holes.

A fluid damper 20 has at least one protrusion 21 that rotates around the flow direction.

22 is a bias shielding plate for blocking the bias flow Fa generated by the aperture 23a.

2a is a nozzle having an aperture IJ 23a, and 24 is a guide wall that gradually expands toward the downstream.

The operation in the above configuration will be explained below. The flow F entering the flow path 14 rotates the impeller 16 and is given a swirling component to become Fl and F2. This flow is controlled by the rectifying member 19
The swirling component is removed and the flow returns to the original flow of F3 and F4. After this flow becomes a rotational resistance of the fluid damper 20, it becomes flows Fa and Fb substantially perpendicular to the direction of the flow F by the throttle 23a. Since the flow of Fa in the figure is blocked by the bias shielding plate 22, the flow of Fa in the nozzle/I
The flow coming out from /23 flows upward in the figure, attaches to the guide wall 24, and heads toward F5. On the other hand, since the fluid damper 20 is integrated with the impeller 16, they rotate together, but since the swirling component of the flow has been removed as described above, the projections 21 collide with the flow, creating rotational resistance. This rotational resistance R is R=COX1/2×ρ×v2×S R: Rotational resistance (approximately constant in the actual usage range).

ρ: Original fluid density.

V: flow velocity in the direction of rotation of the protrusion.

S: Surface area of the protrusion in the rotational direction.

It is expressed as , and is proportional to the flow velocity, that is, the square of the rotational speed. Therefore, even if the flow rate is small, that is, the rotational torque of the impeller 16 is small, the flow velocity V in the above equation is small at the time of startup, so the fluid resistance is small and rotation occurs. When the flow rate increases, the fluid resistance increases in proportion to the square of the rotational speed, so an increase in the rotational speed can be suppressed. Therefore, whether the flow rate is low or high, the rotation speed does not change significantly.

This rotation causes the shielding plate 22 to rotate together with the fluid damper 20, so that the shielding plate 22 rotates and the flow is deflected in the direction of the obstruction.

The flow then performs a slow flapping motion.

Effects of the Invention As described above, the low-speed rotating device of the present invention provides the following effects.

(1) It has a simple structure consisting of an impeller, a rectifying plate, and a fluid damper, and is easy to deal with dust, etc. in the flow.

(a) Because it is a damper that uses fluid resistance, the static friction does not increase as in conventional models, and it operates even at low flow rates.Also, even if the flow rate increases, it has the effect of suppressing the increase in rotational speed. When applied to the air outlet etc.,
A comfortable swing condition can always be achieved regardless of changes in flow rate.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view of a low-speed rotating device according to an embodiment of the present invention, FIG. 2 is a sectional view of the same, and FIG. 3 is a sectional view of a conventional low-speed rotating device. 14...Flow path, 16...Impeller, 19
... Rectifying member, 20 ... Fluid damper,
21...protrusion. Name of agent: Patent attorney Toshio Nakao and 1 other person14
- Channel f6 - Feather wheel 2f - Disaster 3 Figure 2 Figure 3

Claims (2)

[Claims] (1) An impeller provided in a flow path and rotated by the energy of the fluid flowing through the flow path; a rectifying member provided downstream of the impeller to remove swirling components of the flow generated by the impeller; and a fluid damper provided on the downstream side of the rectifying member, the fluid damper having at least one protrusion that rotates around the direction of the rectifying member. (2) The low-speed rotation device according to claim 1, wherein the outflow body is formed by a flat plate substantially parallel to the flow.