JPS58206929A - Flaot switch - Google Patents

Abstract

PURPOSE:To prevent chattering and wavering caused by shaking of a liquid level, by fit-inserting a float having an operating magnetic pole into the inside of a stand column, and providing a sensor unit consisting of upper and lower magnetic switches for operating a set coil and a reset coil of a relay, on two places whose heights are different from each other. CONSTITUTION:A float 3 is fit-inserted into the inside of a stand column 2 which communicates to a tank 1 and is fitted vertically, and an operating magnetic pole 40 is provided on its liquid level position. A sensor unit 60 is provided on a low water level cut-off position in the outside of the stand column 2. Both magnetic switches 61, 62 are constituted so that both of them become on-state when the operating magnetic plate 40 is positioned at each height b', a', and become an off-state in other case. An alarm sounding device and an alarm lamp 7 continue the alarm operation until a reset coil 82 is operated and a relay 80 is switched to an off-state.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a float switch used for controlling the liquid level of a liquid container, and is intended to prevent chattering and wavering due to fluctuations in the liquid level of the liquid container.

Conventionally, a float is inserted into the inside of a vertically mounted stand column communicating with a liquid container so as to be able to rise and fall, and a masterpiece magnetic pole is provided on the float.
There is a float switch with a configuration in which multiple magnetic switches are arranged and the switch is turned on or off depending on whether the operating magnetic pole is higher or lower than the magnetic switch.The float switch with this configuration is a stationary type where the liquid level in the container is stationary. However, in liquid containers where the liquid level constantly fluctuates within the container, such as ship fuel/boilers, the switch may suffer chattering, wavering, etc. due to the fluctuation of the liquid level. It has the drawbacks of unstable operation and inability to properly control the liquid level.

In order to eliminate such drawbacks, this invention completely inserts a float having an operating magnet inside the stand column, and sets a relay set coil and a reset coil at one place outside the stand column or at 2111 places at different heights. The most important feature is the provision of a sensor unit consisting of upper and lower magnetic switches that actuate the coil.

Embodiments of the present invention will be described below with reference to the drawings.

Figures 11g1 to 4 show an embodiment of this invention,
This float switch was installed to prevent the boiler from running dry by opening the burner circuit (not shown) when the water level of the ship's boiler (l) falls below a predetermined height. be.

That is, this float switch connects a float (3) to the inside of a stand column (2) that connects to tank +11 and is attached directly to i#, and sets the operating value to the liquid level of the cough float (3). A meeting will be held. In addition, the outside 1 of the stand column (2)
The senna unit 7 is installed at the low water level a-off position, which is the water level at which the 1111-1 circuit should be opened. And tank 10
When the liquid level in the stand column (2) becomes lower than that of the senna unit, the alarm (not shown) and warning light (
7) etc.

As shown in Fig. 2, the Senna 1 unit is equipped with a pair of upper and lower magnetic switches made of reed switches, and the vertical spacing between both magnetic switches φ supports the lower magnetic switch. It can be arbitrarily adjusted by moving the adjustment plate up and down.

Then, as shown in figure s3, the lower magnetic switch is connected to the set coil 6ρ of the relay, and the upper magnetic switch 2 is connected to the reset coil.

Both magnetic switches - - are both stand columns (2)
When the operating magnetic plates in the inside are located at their respective heights b-a, they are in the on state, and at other times they are in the off state. If the liquid level drops to below, the set coil 6υ will be activated and the relay will be turned off, and the liquid level will rise above b' which is higher than a', the reset coil (to) will be activated and the relay will be turned off. The alarm or warning light (7) continues to actuate the alarm and keep the boiler burner circuit open until - is switched to the OFF state.

Also, if the liquid level rises from below b' to above b', relay ■ is kept in the OFF state until the liquid level drops to below a', which is lower than b, and the alarm and warning light (7) are kept off. is kept inactive and the burner circuit is closed.

Incidentally, as shown in Fig. 4, the above-mentioned operating magnet @- has a pair of magnets (6) and -' on both upper and lower surfaces of one magnetic plate.
Both magnets (6) are fixed with their poles facing each other.
・The peripheral edge of the magnetic plate (b) is extended outward over the entire circumference from the respective peripheral edges of -, so that the peripheral edge of the magnetic plate (b) exhibits a single N-polarity.

Further, the stand column (2) is made of a non-magnetic material such as a stainless steel alloy tube.

The above embodiment is suitable for controlling the lower limit liquid level, but in its configuration, the upper magnetic switch of the sensor unit is connected to the set coil of the relay, and the lower magnetic switch is connected to the reset coil of the relay. By simply making a change, you can obtain a float switch suitable for controlling the upper limit liquid level.

5 to 7 show another embodiment of the present invention, which includes:
This is a high/low water level alarm device used to control the upper and lower limits of the water level in a ship's boiler, and has two locations outside the stand column (2) at different heights, namely, the upper limit water level and the lower limit water level.
Each upper and lower limit sensor unit...I! 4ft, connect the magnetic switch φη above the upper limit sensor unit ■ and the magnetic switch below the lower limit sensor unit to the set coil city center of the relay group, and connect the magnetic switch under the upper limit sensor unit htn and the lower limit sensor unit. The main feature is that the upper magnetic switch → is connected to the reset coil (to), and the other configurations are the same as the embodiment shown in FIGS. 1 to 4. And stand column (2)
It acts as follows in response to the rise and fall of the liquid level.

That is, when the liquid level exceeds the height a of the magnetic switch 61 above the upper limit sensor unit..., the relay group is turned on, and this on state means that the liquid level is higher than the height a of the magnetic switch 61 above the upper limit sensor unit... 〇It is held until the liquid level is lowered below height b. Once the liquid level rises above a, it will not fall below b even if the liquid level fluctuates and falls below a. The relay will remain on for as long as possible.

Once the liquid level has fallen below , the relay group will stop working as long as the liquid level does not rise above a, and unless the liquid level falls below the height a' of the magnetic switch below the lower limit sensor unit. Remains off.

When the liquid level falls below a', the relay remains on until the liquid level again rises above the height b' of the magnetic switch above the lower limit sensor unit.

If the relay is on, the alarm or warning light (7)
When the alarm is activated, especially when the liquid level is below a and turns on, in addition to the alarm activation, a relay opens the boiler's burner circuit (not shown) to prevent the boiler from running dry. This is to prevent it.

When relay (2) is off, the alarm and alarm light (7) are inactive and the burner circuit is closed.

However, in this invention, when the stand column is mounted at a height, the height cannot be determined at a glance, and the work of determining the height requires relatively skill and becomes complicated.

Therefore, in order to solve this problem, Figs.
In the embodiment shown in the figure, a stand column (2) attached with a magnetically operated liquid level gauge 110t and a float (3) having an operating magnetic pole for operating the liquid level gauge are used. Even an unskilled person can easily determine the installation height of the sensor unit by looking at the scale for displaying the liquid level height and the upper and lower limit liquid level marking lines. As a result of making it possible to easily determine the mounting height, the sensor unit can be mounted easily, easily, and efficiently.

In addition, the operating magnetic pole for operating the liquid level gauge and the operating magnetic pole for operating the magnetic switches So, Iwa, →, and Shizu are combined into one operating magnetic pole 4.
There is also the advantage that it can be used for both purposes.

Incidentally, the above-mentioned liquid level gauge... is constructed of a group of magnetic rotors U]) arranged vertically in multiple rows on the outside of the stand column (2), and rotates on the horizontal axis. The operating magnetic pole (
7) Connect the boundaries between the sky and original image identification colors of each magnet rotor so that they are lined up at the same height, and the sky identification color is located on the upper half of the magnet rotor, and the full identification color is located on the lower half of the magnet rotor. It is configured such that N-8 bipolar poles are arranged at both ends in the diametrical direction.

As described above, the present invention provides a magnetic switch that operates the set coil of the relay and a magnetic switch that operates the reset coil of the relay at a predetermined vertical interval tttt on the outside of the stand column, so that the liquid level can rise and fall. Once the operating pole in the stand column is lowered to a height below the lower magnetic switch, the relay is held in the on or off state until the operating pole rises to a height above the upper magnetic switch. Also, the operation magnetic pole is on the upper side @
If the lower magnetic switch is raised to a height above the lower magnetic switch, the relay will be held in the reversed state until the operating magnetic pole is lowered to a height below the lower magnetic switch. It is possible to reliably eliminate unstable operations such as chattering and wavering within the range of liquid level fluctuations that occur in tanks.

Also, compared to conventional ones, magnetic switches such as reed switches are 111! By simply adding this, the flip-flop circuit required between the switch and the set/reset coils in the conventional product can be omitted, and the circuit configuration can be simplified, so it can be implemented at low cost and easily.

Furthermore, according to the second invention, in addition to these effects,
Even an inexperienced person can easily and efficiently assemble the magnetic switch by being able to determine the installation height of the magnetic switch at a glance using the nine liquid level gauges attached to the stand column.

[Brief explanation of the drawing]

Ifgi to FIG. 4 show one embodiment of the present invention, and the first
The figure is a side view of a float switch for preventing dry firing of a ship's boiler, 2-1 is a side view of the inner part of the sensor unit, Figure 3 is a circuit diagram of the female part of the electric circuit, and Figure 4 is a side view of the inner part of the sensor unit. It is a longitudinal cross-sectional view of the float. 5 to 7 show another embodiment of the present invention, FIG. 5 is a 1111 side view of a high/low water level warning device for a boiler of a ship, FIG. 6 is an A-A @ vertical sectional view thereof,
FIG. 7 is a circuit diagram of the main part of the electric circuit. +ll... Boiler, (2)... Stand column, (
3)...Float, Yai...Manipulating magnetic pole, ■・A
・Sensor unit, helmet, u2, 6])...B4...magnetic switch, ■...
・Relay, Subway...Set coil, -...
・Reset coil source, A...Liquid level gauge, O])...Magnetic rotor. Figure 1 Figure 2

Claims (1)

[Scope of Claims] 11) A float having an operating magnetic pole in the cabinet of a vertically mounted stand column communicating with the tank, 11tIA position outside the stand column or 211i of a different size.
A float switch characterized by having a senna unit in one location consisting of upper and lower magnetic switches that operate the set coil and reset coil of the relay. (2) The upper magnetic switch operates the set coil, and the lower magnetic switch operates the reset coil. The float switch described in item 1 of the special specification using a low-position sensor unit that can operate a set coil at a low position. (3) The float switch according to claim 1, which uses a float having a stand column to which a magnetically operated liquid level needle is attached and a magnetic pole for operating the liquid level gauge.