JPH0741915Y2 - Impeller mounting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial field of application) The present invention is to mount a spring member on the outer peripheral portion of a boss portion inserted into a rotary shaft and press the boss portion against the rotary shaft. The present invention relates to an impeller mounting device configured to do the above.

(Prior Art) In a pipe fan, a cylindrical boss is provided in the center of an impeller, a slot is formed along the center line of the boss, and an engaging protrusion is formed on the inner periphery. Then, an annular spring member is attached to the outer peripheral portion of the boss portion, with both ends facing each other with a space. Then, the boss portion is fitted into a rotary shaft having an annular engaging recess, and the boss portion is pressed against the rotary shaft by the tightening force of the spring member, whereby the impeller is detachably attached to the rotary shaft.

(Problems to be solved by the invention) However, since the spring member in the above-described configuration can be mounted on the outer peripheral portion of the boss portion regardless of the direction of the gap portion, the gap between the spring member and the boss portion can be mounted. The positional relationship with the split portion is not constant, and the variation in the pressure contact force of the boss portion with respect to the rotation axis increases. As a result, when the pressure contact force of the boss portion against the rotating shaft is particularly small, there is a problem that the boss portion slips on the rotating shaft and does not rotate integrally.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an impeller mounting device that can always keep a constant pressure contact force of a boss portion with respect to a rotating shaft.

[Structure of the Invention] (Means for Solving the Problem) An impeller attachment device of the present invention has a slotted portion along the center line at the center of the impeller and an engaging protrusion on the inner peripheral portion. A boss portion is provided, and a spring member is attached to the outer peripheral portion of the boss portion so that both ends thereof are opposed to each other with a space therebetween, and a spring member for exerting a tightening force is attached to the boss portion. When a member is mounted on the outer peripheral portion of the boss portion, a positioning protrusion is provided which is inserted into the gap portion of the spring member and abuts both ends of the spring member, and is inserted relatively to the boss portion and engaged therewith. The present invention is characterized in that a rotary shaft is provided which has an annular engaging recess that engages with the recess and is clamped and held by the spring member via the boss in the inserted state.

(Operation) According to the impeller mounting device of the present invention, when the spring member is installed on the outer peripheral portion of the boss portion of the impeller and the gap portion of the spring member is relatively inserted into the positioning projection, the gap portion and the boss are inserted. When the rotating shaft is relatively inserted into the boss portion, the engaging convex portion engages with the engaging concave portion to prevent the spring member from coming off and the spring member. The boss portion is pressed against the rotating shaft with a constant force by the tightening force of.
In this case, when the rotary shaft is not inserted in the boss,
Since both ends of the spring member come into contact with the positioning projection and the tightening force acting on the boss from the spring member is limited, the boss does not elastically deform to an appropriate diameter-reduced state. Is relatively easy to insert into the boss portion, and conversely, it is also easy to relatively remove the rotary shaft from the boss portion. It will be easier.

Embodiment An embodiment in which the present invention is applied to a pipe fan will be described below with reference to the drawings.

First, in FIG. 4, reference numeral 1 denotes a cylindrical case which is mounted in a pipe (not shown), and the decorative frame 1 is mounted at one end of the cylindrical case. Reference numeral 3 denotes an electric motor mounted inside the case 1, and a rotary shaft 4 of the electric motor 3 is formed with an annular fitting recess 5 as shown in FIG.

Next, in FIGS. 1 and 2, 6 is an impeller having four blade pieces 6b projectingly provided on a base portion 6a, and a cylindrical boss portion 7 is formed at the center of the impeller. Inside the rotary shaft insertion hole 7a
I am trying. Reference numeral 8 denotes two slotted portions formed along the center line of the tip portion of the boss portion 7 so that the boss portion 7 can be elastically deformed. Reference numeral 9 denotes an engaging projection formed on the inner peripheral portion of the tip of the boss portion 7 over the entire circumference thereof, which can be fitted into the engaging recess 5 of the rotary shaft 4. Reference numeral 10 denotes a spring member mounted on the outer peripheral portion of the boss portion 7. This is a ring member, for example, formed in a cylindrical shape, and has a gap portion 11 between opposite end portions, and the end edge portion is bent. A flange portion 10a is formed. Reference numeral 12 denotes four reinforcing ribs, which are integrally formed between the base portion 6a and the base end portion of the boss portion 7 so as to correspond to the four blade pieces 6b. Numeral 13 is a positioning convex portion projectingly provided on the boss portion 7 so as to be integrated with one reinforcing rib 12. This is a gap between the spring members 10 when the spring member 10 is mounted on the outer peripheral portion of the boss portion 7. Inserted in part 11. In this mounted state, as is apparent from FIG. 2, both ends (a part of) of the spring member 10 are in contact with both side walls of the positioning projection 13.

Next, the operation of the above configuration will be described.

When the spring member 10 is mounted on the outer peripheral portion of the boss portion 7 of the impeller 6 and the spacing portion 11 is relatively inserted into the positioning convex portion 13, the spacing portion 11 and the slot portion 8 are positioned in a predetermined relationship. It Then, when the rotary shaft 4 is relatively inserted into the boss portion 7, the engaging convex portion 9 engages with the engaging concave portion 5 so that the impeller 6 is prevented from coming off, and the spring member 10 further repels. The boss portion 7 is tightened by the force and brought into pressure contact with the rotating shaft 4.

According to the above-mentioned example, the following effects are produced. That is, since the spacing portion 11 of the spring member 10 mounted on the outer peripheral portion of the boss portion 7 is inserted into the positioning convex portion 13, the spacing portion 11 and the slot portion 8 are positioned in a predetermined relationship. As a result, the variation in the tightening force acting on the boss portion 7 due to the elastic force of the spring member 10 becomes extremely small, and the pressure contact force of the boss portion 7 with respect to the rotating shaft 4 can always be made constant. 4 can be prevented from slipping, and the boss 7 or the impeller 6 can rotate integrally with the rotary shaft 4. Furthermore, in the state where the rotary shaft 4 is not inserted into the boss portion 7, both ends of the spring member 10 abut the positioning protrusion 13 and the tightening force acting on the boss portion 17 from the spring member 10 is limited. The boss portion 7 is not elastically deformed into an excessively reduced diameter state, so that the rotary shaft 4 can be easily inserted relatively into the boss portion 7, and conversely, the rotary shaft 4 can be removed from the boss portion 7. It is relatively easy to remove the blade, and thus the work of attaching and detaching the impeller 6 to and from the rotary shaft 4 is facilitated.

[Effects of the Invention] As is apparent from the above description, in the impeller mounting device of the present invention, the gap portion of the spring member mounted on the outer peripheral portion of the boss portion is inserted into the positioning convex portion provided on the boss portion. So
Positioned in a predetermined relationship with the split part to be the interval part,
The contact force of the elastic force of the spring member with respect to the rotating shaft of the boss can be kept constant, and the impeller can rotate with the rotating shaft constantly. Furthermore, the rotating shaft is inserted in the boss. In the absence state, both ends of the spring member come into contact with the positioning projection and the tightening force acting on the boss portion from the spring member is limited, so that the boss portion does not elastically deform to an excessively reduced diameter state. Therefore, it becomes easy to relatively insert the rotary shaft into the boss portion, and on the contrary, it becomes easy to relatively pull out the rotary shaft from the boss portion. This has the effect of facilitating attachment / detachment work to / from.

[Brief description of drawings]

The drawings show an embodiment in which the present invention is applied to a pipe fan. Fig. 1 is a vertical sectional side view of a main part, Fig. 2 is a rear view of the main part of an impeller, and Fig. 3 is a side view of a rotary shaft. Fig. 4 shows a vertical side view of the whole. In the figure, 4 is a rotary shaft, 5 is an engaging concave portion, 6 is an impeller, 7 is a boss portion, 8 is a slitting portion, 9 is an engaging convex portion, 10 is a spring member,
Reference numeral 11 indicates a space portion, and 13 indicates a positioning convex portion.

Claims (1)

[Scope of utility model registration request] 1. A boss portion which is provided in a central portion of an impeller and which has a slitting portion along a center line and an engaging convex portion on an inner peripheral portion thereof so that both ends thereof face each other with a space therebetween. A spring member bent in an annular shape and attached to the outer peripheral portion of the boss portion to exert a tightening force on the boss portion; and a spring member provided on the boss portion when the spring member is attached to the outer peripheral portion of the boss portion. A positioning protrusion that is relatively inserted into the space of the spring member so that both ends of the spring member abut, and an annular engagement that is relatively inserted in the boss and engages with the engaging protrusion of the boss. An impeller attachment device comprising a rotary shaft which has a fitting recess and is clamped and held by the spring member via a boss portion in the inserted state.