JPH0735585A - Flow switch - Google Patents

Abstract

PURPOSE:To provide a flow switch having the capability of detecting a downstream flow without any additional piping for generating an upstream flow. CONSTITUTION:A guide 2 vertically extended along a flow direction is laid in a flow passage 1 formed out of a pipe line 11. The guide 2 has a lower stopper 31 at the lower end thereof, and an upper stopper 32 at the suitable position thereof. In addition, a float 4 having smaller specific gravity than a fluid and housing a magnet 41 is provided between both stoppers 31 and 32, while the guide 2 being inserted in the intermediate section thereof in such a way as keeping the float 4 vertically slidable along the guide 2. A reed switch 6 is laid and fixed at the required position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow rate switch for detecting a downward flow of a flow rate higher than a certain level in a pipe.

[0002]

2. Description of the Related Art Conventionally, as a flow rate switch, a float with a magnet or a flapper is provided in a flow path to lower the float due to gravity when the flow rate of the fluid is low, and when the flow rate exceeds a certain level, the float moves upward due to the dynamic pressure of the fluid. There is a flow switch that utilizes movement.

FIG. 3 is an explanatory view showing an example of a conventional flow rate switch 10 ', in which a guide 2 extending vertically in the flow direction is provided in a flow passage 1 formed by a pipe 11. A non-magnetic stopper 3 is attached to the tip of the guide 2.

A float 4 having a central portion inserted through the guide 2 is provided so as to be vertically movable along the guide 2. The float 4 has a specific gravity larger than that of the fluid and has a magnet 41 built therein. Further, a reed switch 6 is fixedly provided at a fixed position (in the example shown, near the stopper 3). The reed switch 6 is operated by the contact and separation of the magnet 41. 61
Indicates an electric wire.

[0005]

The conventional flow rate switch shown in FIG. 3 can be used in the upward flow indicated by the arrow Ru, but the float 4 is located at the position of the stopper 3 in the downward flow indicated by the arrow Rd. It remains down and cannot detect the flow rate. Therefore, in order to use the conventional flow rate switch 10 'shown in FIG. 3 in a downward flow, as shown in FIG. 4, an additional pipe 12 is provided to make the flow once upward, and the downward flow Rd is It is necessary to change the flow to the upward flow Ru, exit the flow rate switch 10 ', and then pipe again downward.

Therefore, it is troublesome and costly, and there is a possibility that an air pocket may be formed at the upper portion indicated by reference numeral 5.

[0007]

In order to eliminate the above-mentioned drawbacks, the present invention is arranged in a pipe and extends vertically along the flow direction of a fluid, and has a lower stopper at the tip and a predetermined upper portion. A guide with an upper stopper at the position, a float that is inserted through the center of this guide, has a specific gravity smaller than that of the fluid, and can move up and down along the guide, and a magnet that is built into the float. This is a flow rate switch consisting of a fixed reed switch.

[0008]

1 is an explanatory view showing the structure of a flow switch according to the present invention, in which a flow path 1 formed by a conduit 11 extends vertically along a flow and a lower stopper 3 is provided at the tip.
1. The guides 2 each having an upper stopper 32 at a predetermined position are provided. The guide has a non-magnetic stopper 3 at its tip.

A float 4 having a smaller specific gravity than the fluid is disposed between the upper and lower stoppers so that the center portion thereof is inserted into the guide 2 and can move up and down along the guide 2. A magnet 41 is built in the float 4.
Further, the reed switch 6 is fixed at a fixed position (in the illustrated example, in the vicinity of the upper stopper 32). Reference numeral 61 is an electric wire connected to the reed switch 6. Upper and lower stopper 3
1, 32 are non-magnetic.

[0010]

[Operation] Since the specific gravity of the float is smaller than that of the fluid in the flow switch of the present invention, when the flow rate is small even in the upward flow and in the downward flow, the float 4 reaches the vicinity of the upper stopper 32. Although it is rising, when the flow rate of the downward flow exceeds a certain value, the float 4 is pushed down against the buoyancy force due to the dynamic pressure, and the magnet 41 separates from the reed switch 6, so that the reed switch 6 operates, It detects that the flow rate of the flow has exceeded a certain value.

FIG. 2 shows a pipe for detecting a downward flow such as falling water by using the flow switch 10 of the present invention, and shows that there is no need for an additional pipe for temporarily changing the flow upward. Therefore, there is no trouble in piping and there is no fear of creating an air pocket.

[0012]

The flow rate switch of the present invention has the above-mentioned structure, and when detecting a downward flow, a flow rate switch which does not require an additional pipe for producing an upward flow is obtained. Is.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a configuration of a flow rate switch of the present invention.

FIG. 2 is a diagram showing piping using the flow rate switch of the present invention.

FIG. 3 is an explanatory diagram showing a configuration of a conventional flow rate switch.

FIG. 4 is a view showing a pipe using a conventional flow rate switch.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 flow path 2 guide 3 stopper 4 float 5 air reservoir 6 reed switch 10 flow switch 41 of this invention 41 magnet

Claims (1)

[Claims] 1. A flow switch provided in a pipe for guiding a fluid, the flow switch being disposed in the pipe, extending vertically along a flow direction of the fluid, having a lower stopper at a tip and an upper portion at a predetermined upper position. The guide has a stopper, and the central portion is inserted into this guide, and a flow path is formed between the outer periphery of the guide and the inner wall of the above-mentioned pipe, which has a specific gravity smaller than that of the fluid and moves up and down along the guide. A flow switch, comprising a floating float, a magnet built into the float, and a reed switch that is fixed in place and operates by contact and separation with the magnet.