JPS6321175Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a reverse rotation prevention device for preventing reverse rotation of the rotating shaft caused by the impeller due to falling of the water column when the rotation of a load due to water pumping, such as a pump of a rotating electric machine, is stopped. It is.

In a conventional reversal prevention device for a rotating electrical machine for a water pump, for example, as shown in FIG. 1, the left half is a front view of the main parts of the ratchet, and the right half is a vertical sectional view, the ratchet part 1 is integrated with a bearing bracket 2. The plurality of ratchet pins 3 are provided on the outer ratchet pawl 4.
and are elastically inserted into a plurality of mounting holes 7 of the ratchet coupling 5, respectively. Thus, the lower surface of the ratchet coupling 5 fixed to the rotating shaft 8 and the ratchet pawl 4 are separated by a gap δ, and as the ratchet coupling 5 rotates clockwise, the outer ratchet pawl 4 slopes in one direction. It is lifted upward along the axis and can be slid and rotated, and water can be pumped by an impeller installed at the tip of a rotating shaft 8 (not shown) that rotates to the right. Next, when the rotation is stopped, the ratchet coupling 5 and the ratchet pin 3 prevent the impeller from rotating in the opposite direction as the pumped water falls, as shown in FIG. Rotating to the left, the ratchet pin 3 moves downward along the inclined surface 4a of the ratchet pawl 4 and comes into contact with the ratchet pawl end 4c, preventing the impeller from reversing the rotating shaft 8 of the rotating electrical machine. Damage to the bearing due to reverse acceleration rotation can be avoided.

However, in the conventional configuration described above, it is necessary to manufacture the ratchet pawl integrally with the bearing bracket after determining the direction of the ratchet pawl that stops reverse rotation in accordance with the direction of rotation associated with water pumping. Additionally, if the direction of rotation of the rotating electrical machine by the pump changes due to a change in the pumping load conditions of equipment installation during the manufacture of the rotating electrical machine, use a ratchet claw that is integrated with the bearing bracket that has the corresponding direction of the ratchet claw. There were disadvantages such as having to replace the bearing bracket or fabricating a corresponding bearing bracket in the direction of the ratchet pawl.

The present invention has been developed in view of the above-mentioned circumstances, and includes a ratchet plate in which ratchet pawls are disposed on the upper surface of the bearing bracket, respectively, on the inner and outer circumferences of the upper surface of the bearing bracket. To provide a reversal prevention device that can immediately respond even if the direction of rotation due to water pumping is changed by simply installing and selectively replacing a ratchet pin in the inner or outer insertion hole of ratchet couplings provided concentrically and facing each other. aim at something.

An embodiment of the present invention will be described below with reference to FIGS. 3 and 4. However, parts that are the same as those in the prior art described above will be designated by the same reference numerals and detailed explanations will be omitted. Fig. 3 is an enlarged perspective view of a ratchet coupling showing an embodiment of the present invention, and Fig. 4 shows the main part of the ratchet plate of the present invention in which two concentric ratchet claws are provided, each with a different direction. This will be explained with reference to an enlarged perspective view. The ratchet part 1 according to the present invention is provided with a plurality of mounting seats 1d integrally with the ratchet plate 1b, and on the outer circumference of the upper surface of the ratchet plate 1b.
A one-way ratchet pawl 4 is provided in the same manner as the conventional one shown in FIG. 2, and the ratchet pins 3 are inserted into a plurality of insertion holes 7 concentrically around the outer circumference of a ratchet coupling 5e fixed to the rotating shaft 8. As the rotating electric machine rotates clockwise, the ratchet pin 3 is lifted upward along the inclined surface 4a in one direction of the ratchet pawl 4, making it possible to slide and rotate, and when the rotating electric machine stops, the ratchet pin 3 moves to the left. The rotary shaft 1 is rotated in the opposite direction and comes into contact with the ratchet claw end 4c, so that reverse rotation of the rotary shaft 1 by the impeller is prevented as in the conventional case. According to the present invention, when the rotational direction of the pump is changed due to equipment installation, the ratchet pins 3 are each removed from the plurality of insertion holes 7 on the outer circumference of the ratchet coupling 5e, and the ratchet pins 3 are removed. The ratchet pins 3 are relocated and provided in the plurality of insertion holes 7h on the inner side of the coupling ring 5e, and a ratchet pawl 10 is provided concentrically on the inner side of the upper surface of the ratchet plate in the opposite direction to the ratchet pawl 4 on the outer side. Form multiple pieces.

Next, the functions and effects of the configuration of the reverse rotation prevention device according to the present invention described above will be explained. The ratchet plate 1b according to the present invention is fixed to the upper surface of the bearing bracket, and a ratchet coupling 5e is fixed to the rotating shaft 8 concentrically with a gap δ therebetween, and around the upper surface of the ratchet plate 1b. Two ratchet claws with opposite directions are provided in combination, that is, the outer circumference of the upper surface of the ratchet plate 1b is an axis of rotation caused by the impeller when the pumped water falls after pumping stops when the pump rotates clockwise. A plurality of ratchet pawls 4 in one direction are provided to prevent reverse rotation of the rotary electric machine to the left, similar to the conventional one.In addition, in the present invention, by changing the rotation direction of the rotating electric machine, it is applied to right-handed water pumping, and the water column after stopping is To prevent counterclockwise rotation of the rotor shaft 8 caused by the impeller falling, a one-way ratchet pawl 4 is provided around the inner circumference of the upper surface of the ratchet plate and the outer circumference of the upper surface of the ratchet plate.
A plurality of ratchet pawls 10 are provided in opposite directions, and two ratchet pawls are formed in opposite directions on the inner and outer sides of the upper surface of the ratchet plate 1b, so that the rotation direction of the pump can be changed from clockwise rotation to counterclockwise rotation. If a change is made, the ratchet pin 3 can be removed from the plurality of outer insertion holes 7 of the ratchet coupling 5e shown in FIG. 3 and transferred to the inner insertion hole 7h of the ratchet coupling 5e. The ratchet pin 3 is brought into contact with the upper surface of the ratchet pawl 10 on the inner side of the upper surface of the ratchet plate, and as the rotating electrical machine rotates counterclockwise, the ratchet pin 3 is lifted upward along the inclined surface 10a of the ratchet pawl 10 on the inner side of the upper surface of the ratchet plate in the opposite direction. Sliding rotation is possible in the counterclockwise rotation direction, and water is pumped by an impeller. If the impeller rotates the rotating shaft 8 in the opposite direction to the right as the water column falls after the rotating electric machine has stopped, the ratchet pin rotates in the opposite direction to the right, comes into contact with the ratchet claw end 10c and stops, and the rotating shaft 8 The reverse rotation of has the effect of being blocked.

As described above, according to the configuration of the present invention, two ratchet pawls are provided on the outer and inner sides of the upper surface of the ratchet plate 1b, respectively, in opposite directions, and the ratchet is fixed to the rotor shaft 8 concentrically with a gap between them. Couplings are provided facing each other, and the outer insertion hole 7
and an inner insertion hole 7h, so a ratchet pawl that is suitable for the direction of rotation of the rotating shaft 8 of a rotating electric machine for water pumping such as a pump, and for preventing reverse rotation of the rotating shaft 8 by the impeller when stopped, can be selected. By simply replacing the ratchet pin 3 with the outer insertion hole 7 or the inner insertion hole 7h of the ratchet coupling, no matter which rotation direction the rotating electric machine due to water pumping is changed to, the ratchet pin 3 can be moved in either direction. Reverse rotation of the rotating electrical machine, which is characterized in that the rotating electrical machine can be operated through the ratchet claws 4 or 10 in conjunction with water pumping, and that the end of the ratchet claw prevents rotation of the rotating shaft at reverse acceleration due to the impeller when the rotating electrical machine is stopped. You can get a preventive device.

[Brief explanation of the drawing]

Figure 1 shows the left half of a conventional reversal prevention device; the left half is a front view of the main parts of the ratchet, the right half is a vertical cross-sectional view, Figure 2 is an enlarged perspective view of the main parts of the ratchet pawl in Figure 1, and the third
The figure is an enlarged perspective view of a ratchet coupling according to an embodiment of the present invention, and FIG. 4 is an enlarged perspective view showing the main part of the ratchet pawl of the ratchet plate of the present invention. 1b... Ratchet claw, 2... Bearing bracket, 3... Etch pin, 4... Outer ratchet claw, 5e... Ratchet cup spring, 7
...Insertion hole on the outer circumference of the ratchet cutter spring,
7h...Ratchet coupling inner insertion hole, 10...Inner ratchet claw, δ...Gap.

Claims (1)

[Scope of utility model registration request] A ratchet plate provided with two ratchet claws is fixed to the upper surface of a bearing bracket that holds a bearing that supports a rotating shaft of a rotating electric device, etc., and a plurality of ratchet claws are provided in one direction around the outer circumference of the upper surface of the ratchet plate, In addition, a plurality of ratchet pawls are provided on the inner circumference in the opposite direction to the outer circumference, and a ratchet coupling is provided concentrically with the ratchet plate and fixed to the rotating shaft with a gap between them, and the outer circumference of the ratchet coupling is a plurality of insertion holes for a plurality of ratchet pins facing the ratchet pawl in one direction, and insertion holes for a plurality of ratchet pins facing the ratchet pawl in the opposite direction are bored in the inner circumference of the ratchet coupling ring, respectively, and the ratchet pin A reversal prevention device that is selectively inserted into the insertion hole of the inner or outer ratchet pin of the ratchet coupling ring.