JPH0117068Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a float switch for controlling a submersible pump or the like.

[Conventional technology]

As a conventional float switch, it was introduced in 1973.
There is one described in Publication No. 42766.

In this known float switch, a micro switch is fixed to one side of the inside of a switch case provided in the float, and a weight that freely moves in the direction of the micro switch is provided on the other side, so that the float is reversed when the liquid level changes. Then, the switch rod provided on the weight presses on or separates from the action piece of the microswitch.

[Problem that the invention attempts to solve]

In the case of a conventional float switch like the one above,
Since the movement of the weight inside the switch case is linear, the weight may not move smoothly even if the float moves up and down in an arc.

[Means for solving problems]

In order to solve the above problems, this invention provides a guide rail adjacent to the microswitch inside the float, which forms part of an arc centered on the microswitch side. A weight that slides and moves to the end of the rail when facing downward is provided, and between the microswitch and the guide rail, the operating piece of the microswitch is pushed by the weight that moves toward the microswitch activation side. It is equipped with a rocking piece that pushes the auxiliary rocking piece.

[Effect]

Since this invention has the above-mentioned configuration, when the float switch of this invention is used to control the start and stop of a submersible pump, the weight is on the side of the microswitch when the float is directed downward, that is, when the water level is low.

Therefore, since the rocking piece and the auxiliary rocking piece which actuate the working piece of the microswitch are in a state where the working piece is pushed in, the pump motor is stopped.

Next, when the water level rises and the float floats upwards, and the weight swinging along the rail is on the side opposite to the microswitch activation side, the swinging piece is no longer pushed by the weight. Therefore, the auxiliary rocking piece is in a position where it does not push the working piece of the microswitch, closing the microswitch and starting the pump.

Next, when the water level falls and the float points downward, the weight moves along the rail to a position close to the microswitch, and the auxiliary rocking piece is pressed by the rocking piece, opening the microswitch and stopping the pump.

〔Example〕

In Figures 1 and 2, 1 is a hollow synthetic resin float, and a flexible cable 2 connected to a control circuit of a submersible pump or the like is inserted into an opening formed at one end of the float 1. A float cap 3 is detachably attached thereto.

4 is a guide rail fixed inside float 1,
It is fixed to the support piece 5 inside the float 1 by means of screws or the like so as to form an arc having the same center as the center of the float 1.

6 is a weight slidably attached to the rail 4;
As shown in the figure, the rail 4 is cut into two halves so as to sandwich the two halves, and the rail 4 is loosely fitted into an arc-shaped groove provided on the mating surface of the two halves, and is assembled together by means such as fixing with a set screw 7.

10 is a bracket fixed inside float 1,
A micro switch 11 is fixed to this bracket 10 with screws 12.

Shaft 1 is attached to both ends of the switch 11 on the guide rail side.
4 and 15 are constructed and fixed, the rear end of a swing piece 16 is rotatably attached to the shaft 14, and the rear end of an auxiliary swing piece 17 is rotatably attached to the shaft 15.

The tip of the swing piece 16 is received by a stopper 18 fixed to the bracket 10.

Further, the auxiliary rocking piece 17 is in contact with the operating piece 19 of the switch 11, and its outer end is in contact with the inside of the rocking piece 16.

In the above embodiment, when the switch 11 is used to control a submersible pump, when the water level in the water tank in which the pump is immersed is at a low water level such that the pump cannot operate, the float 1 is activated as shown in FIG. Cable 2 side is facing up.

At this time, the weight 6 is on the microswitch operation side, and the weight 6 pushes the swinging piece 16 and further pushes the auxiliary swinging piece 17, so that the auxiliary swinging piece 17
Pushing in 9.

In this state, the micro switch 11 is open and the pump is stopped.

When the water level rises and the float 1 faces upward, the weight 6 moves to the other end of the guide rail 4 as shown in FIG.

Therefore, the auxiliary rocking piece 17 is pushed by the action piece 19 of the micro switch 11 and pushes the rocking piece 16, thereby closing the micro switch 11 and starting the motor of the submersible pump.

From the above operating state of the pump, the water level decreases and the float 1 is directed downward, resulting in the first state shown in FIG. 1, and the pump stops.

〔effect〕

As mentioned above, this invention provides a guide rail adjacent to the float that forms part of an arc centered on the microswitch side, and this guide rail slides when the float is turned upward or downward. Since a moving weight was provided at the end of the rail,
The float moves extremely smoothly in response to the up and down movements of the float. In addition, between the micro switch and the guide rail, a rocking piece was provided that pushed the auxiliary rocking piece, which was pushed by the weight that moved toward the microswitch operation side and pushed the working piece of the microswitch.
The lever action expands the pressing force of the operating piece of the microswitch, so there is an effect that the weight can be made smaller.

[Brief explanation of the drawing]

1 and 2 are longitudinal sectional front views showing one embodiment of this invention in various states, and FIG. 3 is a partially sectional plan view of the same. 1...Float, 2...Flexible cable, 4...
... Guide rail, 6 ... Weight, 11 ... Micro switch, 16 ... Rocking piece, 17 ... Auxiliary rocking piece,
19...Action piece.

Claims (1)

[Scope of utility model registration request] A micro switch is fixed inside a hollow float to which a flexible cable is attached, and a guide rail that forms part of an arc centered on the micro switch side is provided adjacent to the micro switch, and the float is attached to this guide rail. A weight that slides and moves to the end of the rail when it is turned upward or downward is provided, and between the micro switch and the guide rail, the actuating piece of the micro switch is pushed by the weight that moves toward the micro switch operating side. A float switch equipped with a rocking piece that pushes an auxiliary rocking piece that pushes in.