JP2502274Y2 - Float switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an improvement of a float switch used for measuring differential settlement of a structure.

(Prior Art) A water level detection device using a float switch is used as a method for measuring uneven settlement of a building. This is because by arranging a cylindrical container containing a float vertically at each measurement point and injecting water into the passages that connect these cylindrical containers, the float that rises to a predetermined height with the rising water surface inside the cylindrical container. Is designed to change the switch,
A water level gauge that continuously detects the water level is installed at the reference measurement point, and the level of each measurement point is detected from the water level detected by the water level gauge when the switch at each measurement point is switched.

In this case, the rod-shaped float guide with the upper end fixed to the cylindrical container is penetrated into the float inside the cylindrical container so that the float inside the cylindrical container is displaced smoothly in response to the rise of the water surface, and the float is moved vertically. I will guide you to.

(Problem of the invention) In that case, if the float guide is not configured coaxially with the cylindrical container, the ascending float contacts the wall surface of the cylindrical container on the way to prevent the ascending. It was not easy to maintain the coaxiality with the cylindrical container because the lower end was a free end only by fixing it to the cylindrical container.

The present invention has been made to solve the above problems, and an object thereof is to ensure the coaxiality between the float guide and the cylindrical container by a simple means.

(Means for Solving the Problems) The present invention is axially slidably fitted to the outer periphery of a rod-shaped float guide which is inserted into a vertical cylindrical container from above and whose upper end is fixed to the cylindrical container. In a float switch that is equipped with a float and slides up and down according to the water level in the cylindrical container to switch the switch, the lower end of the float guide makes contact with the inner wall surface of the cylindrical container to displace the float guide in the transverse direction. There is provided a spacer formed of a rigid member such as a metal that regulates the above, and a plurality of holes for water circulation are formed in this spacer.

(Function) The spacer formed of a rigid member such as metal comes into contact with the inner peripheral wall surface of the cylindrical container to restrict the displacement in the transverse direction, and the float guide is always held at the coaxial position with respect to the cylindrical container. It slides along the float guide without contacting the inner wall of the cylindrical container. Further, since the spacer has a plurality of holes for water flow, the inflow into the cylindrical container is not hindered and the spacer does not hinder the upward movement.

(Embodiment) FIGS. 1 and 2 show an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a cylindrical container which is vertically fixed to a wall surface 10 of a building through a support metal fitting 11 and a bracket 12.
An opening 2 communicating with the water injection valve is formed at the lower end of the cylindrical container 1. Further, the inside of the cylindrical container 1 communicates with the atmosphere through an air hole provided at the upper end.

A rod-shaped float guide 3 and a cylindrical float 4 are housed in the cylindrical container 1. An upper end of the float guide 3 is fixed to the cylindrical container 1, and a disk-shaped spacer 5 is fixedly provided at the lower end of the float guide 3 so that the outer periphery is close to the inner periphery of the cylindrical container 1. The spacer 5 is formed of punching metal so as not to prevent the rise of the water level in the cylindrical container 1.

As shown in detail in FIG. 2, the float 4 is slidably fitted on the outer periphery of the float guide 3 above the spacer 5, and the spacer 5 prevents the spacer from falling off from the float guide 3. Reference numeral 6 is a stopper that restricts the float 4 from displacing upward more than a certain amount.

The float guide 3 is provided with an electrical contact that communicates when the float 4 is raised to a predetermined position, and a signal current flows through the lead wire 7 introduced into the float guide 4 by conduction of the contact.

 Next, the operation will be described.

When the cylindrical container 1 is empty, the float 4 is on the spacer 5, and no current flows through the lead wire 7.

When the water injection from the water injection valve is started and water flows into the inside of the cylindrical container 1 through the opening 2, the water surface inside the cylindrical container 1 rises, and the float 4 floats up from the spacer 5 in due course. Thereafter, the float 4 is guided by the float guide 3 and ascends in the cylindrical container 1 together with the water surface. Thus, when the float 4 reaches a predetermined height, the electrical contacts provided on the float guide 3 are brought into conduction, and a signal current flows through the lead wire 7.

In this case, since the float guide 3 having the upper end fixed to the cylindrical container 1 is restricted in displacement in the transverse direction by the spacer 5 whose outer periphery is brought close to the inner wall surface of the cylindrical container 1, it is always coaxial with the center of the cylindrical container 1. Retained. Therefore, there is no possibility that the float 4 rising along the float guide 3 will come into contact with the wall surface of the cylindrical container 1 on the way, and the float 4 will rise smoothly as the water surface rises. Therefore, the current signal flows through the lead wire 7 at an accurate timing in accordance with the rise of the predetermined level on the water surface, and the level is measured accurately.

(Effect of the Invention) As described above, the present invention is provided with a spacer formed of a rigid member such as metal for restricting the displacement in the transverse direction of the float guide at the lower end of the float guide by contact with the inner peripheral wall surface of the cylindrical container, Since a plurality of holes for water circulation were drilled in this spacer, the float guide is always held coaxially with the center of the cylindrical container by the spacer that does not deform,
There is no risk that the float guided by the float guide will come into contact with the wall surface of the cylindrical container, and the water smoothly flows into the cylindrical container through the multiple holes for water circulation provided in the spacer. Displaces smoothly with the water surface in the cylindrical container. Therefore, it is possible to detect the arrival of the water surface at a predetermined level at an accurate timing, and it is possible to improve the accuracy of the float switch.

[Brief description of drawings]

FIG. 1 is a side view of a float switch showing an embodiment of the present invention, and FIG. 2 is a side view of a float guide and a float. 1 ... Cylindrical container, 3 ... Float guide, 4 ... Float, 5 ... Spacer.

Claims (1)

(57) [Scope of utility model registration request] 1. A cylindrical container provided with a float which is inserted into a vertical cylindrical container from above and which is axially slidably fitted to the outer periphery of a rod-shaped float guide whose upper end is fixed to the cylindrical container. In a float switch that connects and disconnects the switch by a float that slides up and down according to the water level of the A float switch comprising a spacer formed of a member, wherein the spacer is provided with a plurality of holes for the passage of water.