JPH0625730U - Flow rate detection switch - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a flow rate detection switch capable of linearly detecting flow rate changes by expanding the flow rate detection range. [Structure] At the lower end of the tapered pipe portion 5, fluid inlets 6a and 6b are provided.
To provide. A fluid outlet 7 is provided at the upper end of the tapered pipe portion 5. The guide shaft 3 is provided at the axial center of the tapered tube portion 5. Two reed switches 8 and 9 are mounted in the guide shaft 3 with their positions vertically displaced. The float 4 is attached to the outer peripheral portion of the guide shaft 3. On the inner circumference of the float 4, the magnet 1
Fix 1a, 11b and 11c. The float 4 moves up and down along the guide shaft 3 according to the flow rate of the fluid flowing in the casing 1, and stops at a balanced position. Magnet 1
When 1a, 11b and 11c approach the reed switches 8 and 9, the reed switches 8 and 9 are closed according to the position of the float 4, and the flow rate can be known from the open / closed state.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a flow rate detection switch used in, for example, an electrolytic ionized water generator, and more particularly to a flow rate detection switch capable of expanding a flow rate detection range.

[0002]

[Prior art]

 Generally, in an electrolytic ionized water generator, a flow rate detection switch is used to balance the flow rate of alkaline ionized water and acidic water, or to control the current by detecting the pH of acidic water. There is.

By the way, a conventional flow rate detection switch has a structure in which a magnet is attached to an operating member that operates by a change in flow rate, and a reed switch that is closed by the approach of the magnet detects the magnitude of the flow rate.

[0004]

[Problems to be solved by the device]

 Since the conventional flow rate detection switch can detect the flow rate with a relatively simple structure, it can be used in places where various piping systems such as water supply / drainage and cleaning liquid around the electrolytic cell are gathered, like an electrolytic ion water generator. Although it has the advantage that it can be applied without any hindrance, it can detect only two modes of large and small flow rates.For example, it can detect three or more modes of large, medium, and small flow rates. There is a problem that is impossible.

The present invention has been made in view of the current situation, and an object thereof is to provide a flow rate detection switch capable of widening the flow rate detection range and detecting flow rates of three or more modes.

Another object of the present invention is to provide a flow rate detection switch capable of detecting a wider range of flow rate by reducing the number of magnetically driven contacts.

[0007]

[Means for Solving the Problems]

 As a means for achieving the above object, the present invention provides a casing in which a flow passage cross-sectional area increases from a lower fluid inlet to an upper fluid outlet; and a guide arranged at the flow passage axial center portion of the casing. A shaft; a float that is attached to this guide shaft and moves up and down along the guide shaft according to the flow rate of the fluid; a magnet that is attached to this float; , A plurality of magnetically driven contacts that open and close when the magnets approach each other.

Further, in the present invention, it is more preferable to provide means for detecting the fluid flow rate from the open / closed state of each magnetic drive type contact.

[0009]

[Action]

 In the flow rate detection switch according to the present invention, a plurality of magnetically driven contacts are incorporated in the guide shaft that guides the vertical movement of the float by vertically shifting the positions, while a magnet is incorporated in the float. ing. Therefore, for example, when there are two magnetically driven contacts, it is possible to detect the flow rate in three modes, when both contacts are inactive, only the lower contact is active, and both contacts are active. .

In the present invention, by providing a means for detecting the fluid flow rate from the open / closed state of each magnetic drive type contact, for example, when there are two magnetic drive type contacts, only the upper contact is activated. Can also be taken out as a flow rate detection signal, enabling a wider range of flow rate detection.

[0011]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an example of a flow rate detection switch according to the present invention, and the flow rate detection switch 1 includes a casing 2, a guide shaft 3, and a float 4.

As shown in FIG. 1, the casing 2 includes a tapered pipe portion 5 whose flow passage area gradually increases from the lower end to the upper end, and a fluid pipe is provided at the lower end portion of the tapered pipe portion 5. Inlets 6a and 6b are provided, and a fluid outlet 7 is provided at the upper end of the tapered tube portion 5.

As shown in FIG. 1, a guide shaft 3 having a cylindrical shape with an upper end closed is installed at the axial center of the tapered pipe portion 5, and inside the guide shaft 3, the guide shaft 3 is vertically positioned. The two reed switches 8 and 9 are assembled by shifting them, and their lead wires 8a and 9a are drawn out from the lower end of the guide shaft 3 and connected to a flow rate detector 10 which will be described in detail later.

As shown in FIG. 1, a float 4 is mounted on the outer peripheral portion of the guide shaft 3, and the float 4 moves up and down along the guide shaft 3 according to the fluid flow rate. ing.

As shown in FIG. 1, three ring-shaped magnets 11a, 11b, 11c are fixedly provided on the inner peripheral portion of the float 4 at intervals in the vertical direction. The magnets 11a, 11b and 11c close the lead switches 8 and 9 which are normally open when the magnets 11a, 11b and 11c approach the lead switches 8 and 9 as the float 4 moves up and down. Each of the flow rate detectors 10 is adapted to detect the fluid flow rate from the open / closed state of each of the reed switches 8 and 9.

That is, the open / closed state of each of the reed switches 8 and 9 has four modes depending on the position of the float 4, and the flow rate detector 10 corresponds to each of the modes and is shown in Table 1 as follows. The flow rate of the embodiment is detected.

[0017]

[Table 1]

Next, the operation of this embodiment will be described. The fluid supplied from the fluid inlets 6a and 6b into the casing 2 passes through the tapered pipe portion 5 and is discharged from the fluid outlet 7. However, the tapered pipe portion 5 cuts the flow path from the lower end to the upper end. Since the area gradually increases, the float 4 rises along the guide shaft 3 and stops at a position corresponding to the fluid flow rate.

By the way, since the magnets 11a, 11b, 11c are incorporated in the float 4, when the float 4 rises along the guide shaft 3 and approaches the reed switches 8, 9, the reed switches 8 normally open. , 9 will be closed.

As shown in Table 1 above, the open / closed states of the reed switches 8 and 9 have four modes. The flow rate detector 10 detects four types of fluid flow rates from these modes. .

However, since the two reed switches 8 and 9 are provided in the guide shaft 3 and these are operated by the magnets 11a, 11b and 11c incorporated in the float 4, the conventional flow rate is reduced. It is possible to expand the flow rate detection range where the size of the flow was not detected. Moreover, since the signals from the respective reed switches 8 and 9 are not directly used but used as the input signal of the flow rate detector 10, the flow rate detection range should be set until the reed switch 8 is opened and the reed switch 9 is closed. The flow rate detection range can be further expanded.

In the above embodiment, the case where the signals from the reed switches 8 and 9 are used as the input signals of the flow rate detector 10 has been described, but the signals from the reed switches 8 and 9 are used directly. May be.

Further, in the above-described embodiment, the case where two reed switches 8 and 9 are used has been described, but three or more reed switches may be used. The flow rate detection range can be further expanded by using three or more reed switches.

Further, in the above embodiment, the case where the three magnets 11a, 11b 1 and 11c are incorporated in the float 4 has been described, but the number thereof is not limited. The inner surface of the taper pipe portion 5 does not necessarily have to be tapered, and may have a shape in which the flow passage cross-sectional area expands stepwise from the lower end to the upper end, for example. Further, magnetic drive type contacts other than the lead switches 8 and 9 may be used.

[0025]

[Effect of device]

 As described above, according to the present invention, a plurality of magnetic drive type contacts are vertically displaced and a magnetic drive type contact is incorporated, and a magnet is incorporated in the float. Therefore, the flow rate detection range can be expanded.

Further, in the present invention, the flow rate can be detected in a wider range by providing the means for detecting the fluid flow rate from the open / closed state of each magnetic drive type contact.

[Brief description of drawings]

FIG. 1 is a sectional view showing a flow rate detection switch according to an embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Flow rate detection switch, 2 ... Casing, 3 ... Guide shaft, 4 ... Float, 5 ... Taper pipe part, 6a, 6
b ... Fluid inlet, 7 ... Fluid outlet, 8, 9 ... Reed switch, 10 ... Fluid detector, 11a, 11b, 11c
…magnet

Claims (2)

[Scope of utility model registration request] 1. A casing whose flow passage cross-sectional area expands from a lower fluid inlet to an upper fluid outlet; a guide shaft arranged at the flow passage axial center portion of this casing; A float that moves up and down along the guide shaft according to the flow rate of the fluid; a magnet attached to this float; a plurality of magnets that are installed inside the guide shaft at vertically displaced positions and that open and close when the magnet approaches A flow rate detection switch, comprising: a magnetically driven contact. 2. The flow rate detection switch according to claim 1, further comprising means for detecting a fluid flow rate based on an open / closed state of each magnetic drive type contact.