JPH0729423U - Lighting indicator for magnet type liquid level gauge - Google Patents

Abstract

(57) [Summary] [Purpose] Development of a lighting indicator that lights up and displays the internal liquid level of tanks, boilers, etc. [Structure] A large number of magnetic sensors and light-emitting diodes are arranged along the outer vertical direction of the liquid column tube, and these light-emitting diodes are operated via a float-following magnet that follows the liquid level in the liquid column tube and a magnetic sensor operated by a magnet. Light emitting diode is lit and displayed. [Effect] Since the liquid level can be displayed by turning on the light emitting diode, the liquid level can be clearly displayed and recognized even in a dark place such as at night.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lighting indicator for a liquid level gauge used for displaying the liquid level in tanks for the chemical industry, steam service boilers and the like.

[0002]

[Prior art]

 In chemical industry tanks, etc., it is necessary to detect the amount of liquid in the tank at an appropriate time, so conventionally, many magnet type liquid level gauges with a rotor indicator are provided.

A conventional rotor indicator for a magnet type liquid level gauge used in this tank has a structure as shown in FIGS. 1 and 2, for example. That is, the rotor indicator 5 is vertically mounted on the side surface of the liquid column tube 4 made of a non-magnetic metal, which connects the conduits 2 and 3 provided at the upper part and the lower part of the tank 1, respectively. is there.

The rotor indicator 5 has a large number of rotors 8 which are rotated by the magnetic force of a magnet 7 attached to a float 6 floated in the liquid in the liquid column tube 4 on the outer surface of the liquid column tube 4. The rotor 8 of the rotor indicator 5 arranged in the upward and downward directions and attached to the outside of the liquid column tube 4 by the movement of the magnet 7 is rotated to detect and indicate the liquid level. That is, when the liquid level 9 rises, the float 6 rises, and the magnetic force of the magnet 7 built in the upper outside of the float 6 causes the rotor 8 of the rotor indicator 5 to rotate half a turn one after another, causing the color to change. The part A is displayed in red and the gas part B is displayed in white, and the boundary C is the liquid level 9 so that the liquid surface can be visually confirmed. When the liquid level 9 is lowered, the float 6 is lowered, and the liquid level is lowered and changed similarly to the case where the liquid level 9 is raised, whereby the liquid level in the tank can be visually confirmed. A magnet 10 magnetized in the diametrical direction is embedded in each rotor 8 as shown in FIG.

[0005]

[Problems to be solved by the device]

 However, the rotor indicator 5 having such a structure has the following drawbacks and inconveniences.

B. A method for detecting and displaying the liquid level 9 of the rotor indicator 5 is a machine for rotating the rotor 8 by attraction and repulsion of the magnet 10 with built-in rotor that operates along with the vertical movement of the magnet 7 mounted on the float 6. Since it is due to the rotational force of the rotor, it is difficult for the rotor 8 to follow and rotate when the magnet 7 of the float 6 moves up and down quickly due to the frictional resistance of the rotor and the length of time for applying the moving magnetic force. However, there is a drawback that the liquid level 9 display is disturbed.

B. The magnet type rotor indicator 5 is installed outdoors such as in a plant or at a factory site, but it is difficult to see if the liquid level is displayed in red or white, especially at night outdoors or in a dark place. Lighting is required for liquid level observation, which is inconvenient.

C. In the rotor indicator 5, the liquid level alarm or control switch cannot be taken out, and there is an inconvenience that a level switch must be purchased separately in order to carry out this.

[0009]

[Means for Solving the Problems]

 The present invention has been made by paying attention to such conventional drawbacks and inconveniences, and the following means solve these problems.

B. Regarding the tracking of the display for rapid vertical movement of the liquid level, an electric magnetic sensor with a motion and recovery time of 5 ms or less is used to detect the liquid level so that the detection can also follow the instantaneous vertical movement of the float magnet. By using this magnetic sensor to turn on the light emitting diode for display, the display can follow the rapid change in the liquid level.

B. The liquid level display has a large number of light emitting diodes in cascade so that it can be easily observed even outdoors at night or in a dark place.

C. The alarm or control switch for the liquid level can be taken out from any number and any place directly from the indicator.

[0013]

【Example】

 The first embodiment of the present invention will be described in detail below with reference to FIGS. 4 and 5. However, the structure of the tank body and the structure of the float are the same as those of the conventional example. The same reference numerals as those given are given and the description of the same structural parts is omitted.

Reference numeral 11 denotes a lighting indicator mounted on the outer surface of the liquid column tube 4 along the vertical direction thereof. The lighting indicator 11 is made of a non-magnetic material. Inside, a plurality of reed switches (magnetic sensors) 13a to 13n are arranged in a line from the bottom to the top, and further light emitting diodes 14a to 14n corresponding to the reed switches are arranged from the bottom to the top. It is arranged. Reference numeral 15 denotes a DC constant current power source 16 for lighting the above light emitting diode and a control box containing a relay, and the reed switches and the light emitting diodes are arranged in a vertical arrangement with a space of, for example, 10 mm. I am doing it.

The basic structure of the first embodiment has been described above. Next, its operation will be described.

That is, when the liquid in the tank 1 increases or decreases, the float 6 floated on the liquid in the liquid column tube 4 moves up and down in accordance with the vertical movement of the liquid level 9 in the tank 1. Since the magnet 7 in the float 6 is attached to the float so as to be at the liquid level 9, the vertical movement of the magnet 7 due to the vertical movement of the float 6 indicates the position of the liquid level 9. Therefore, when the float 6 operates according to the liquid level 9 and the magnet 7 is displaced in accordance with the operation of the float 6, the lighting indicator 11 vertically mounted on the side surface of the liquid column tube 4 has a vertical interval of 10 mm. Of the reed switches arranged in a large number, the reed switch approaching the vertically moving magnet 7 is turned on in response to the magnetism of the magnet 7. In this case, all the light emitting diodes corresponding to the reed switch which is switched on, that is, all the light emitting diodes below (lower position) including the light emitting diode corresponding to the liquid level 9 are continuously lit.

In FIG. 4, black circles show examples of lighting diodes.

Next, the principle of continuous lighting will be described with reference to FIG.

As shown in FIG. 5, all the combinations of the plurality of lead switches 13a to 13n and the light emitting diodes 14a to 14n, which are arranged at intervals of 10 mm in the vertical direction of the lighting indicator 11, are connected in series. The lower end of the combination of the magnetic sensor and the light emitting diode is connected to the DC constant current power supply 16. Then, when the reed switch approaching the float magnet 7 indicating the liquid level 9 is magnetized and the reed switch is turned on, the light emitting diode corresponding to this reed switch and all the light emitting diodes arranged below it. The lamp is lit because it is connected in series to the DC constant current power source at the lower end, and this instructs the lighting of the liquid portion, and the upper limit of the liquid portion, that is, the liquid surface is displayed.

Note that FIG. 6 shows the lighting indicator 11 when the liquid level measurement range (height) is 1000 mm, and when the liquid amount is outside the measurement range, the scale over is clearly displayed. It shows an example of a light emitting diode arrangement.

That is, the lowermost end of the light emitting diodes arranged in one row above and below is green and has no lower limit over-lamp, and there is no yellow caution lamp above it, and a liquid level indicator capable of displaying red color above it. It is a lamp. In addition, a yellow lamp, which is different from red, is arranged at regular intervals in the red level liquid level display lamp in order to easily estimate the level of the liquid level of, for example, 1000 mm, 2000 mm, and 3000 mm.

At the uppermost stage of the light emitting diode row, for example, a green upper limit over lamp is arranged.

As described above, by providing the lower limit upper lamp and the upper limit over lamp which are different in color, it is possible to easily visually confirm that the liquid in the tank 1 exceeds the lower limit or the upper limit.

FIG. 7 is a circuit diagram for turning on the scale-over display lamp shown in FIG.

That is, as shown in FIG. 7, the magnetic field of the magnet 7 is usually substantially spherical and the tip is not sharp. Therefore, with respect to the vertical movement of the magnet 7, when a large number of reed switches are arranged close to the magnetic position for safety, a plurality of reed switches are simultaneously activated and turned on. That is, when the liquid level, that is, the position of the magnet 7 is close to the lead switch 5S, the lead switches 4S, 5S, and 6S are simultaneously sensitively turned on. However, in this case, when the lead switch of 4S is turned on, the light emitting diode of L5 and the light emitting diodes of L4 to L0 on the constant current DC power supply side are turned on, and the light emitting diodes of L6 to L100 are turned on by the magnetic sensor 4S. , It does not light because it is short-circuited to the power supply.

That is, the display light emitting diode below the liquid level is turned on by the lead switch below and adjacent to the magnetic sensor that is sensitive to the magnet at the liquid level.

When the magnet 7 rises from the lower position, which is the lower limit overscale, the first liquid level display (zero liquid level) light emitting diode is L0, which brings the magnet position to the lead switch (0S) position. Therefore, since the light-emitting diode L0 must be turned on by the sensitive ON of the adjacent lower reed switch (-1S) due to this magnetic field, the lead switch (-1S) is provided below (0S). Further, since the lower limit over lamp L (-1) is turned on, the reed switch (-2S) is arranged below (-1S).

Therefore, when the magnet 7 becomes the reed switch (0S) (liquid level zero), the lower limit over lamp L (-1) is turned off. Therefore, the relay RY1 and the reed switch (-2S) are connected to the reed switch (1S). Insert the latch relay RY2 as shown in Fig.7.

A light emitting diode L (−2) is provided as a minimum load in the constant current DC power supply. This light emitting diode L (-2) is not used as a display.

Note that the embodiment shown in FIG. 7 has been described by arranging and connecting the constant current DC power source under the connection circuit of the reed switch and the light emitting diode arranged in the vertical direction, but the present invention is not limited to this. For example, a constant current DC power source may be arranged and connected above the reed switch and the light emitting diode connection circuit.

The distance D between the magnetized surface of the magnet 7 and the reed switch array can be determined by the strength of the magnetic force of the magnet 7 and the sensitivity of the reed switch, but in the present embodiment, The following values were used: magnet, reed switch, and between magnet and reed switch.

I) Strength of magnetic force of magnet: 3000 gauss (rare earth cobalt magnet) on magnetized surface ii) Sensitivity of magnetic sensor: 15 to 20 AT (ampere turn) iii) Magnet magnetized surface and lead Between switches D ... 15 mm iv) Magnet dimensions ... Width 15 mm × height 10 mm × depth 8 mm (the facing surface of 15 mm × 10 mm is a magnetized surface). A large number of reed switches that are sensitively operated by magnets that follow the internal liquid surface of the extending liquid column tube 4 are arranged in the vertical direction, and are connected in parallel between the constant current and DC power supplies, and each light emission corresponding to the reed switches is arranged. Since this is a lighting indicator in which a diode is connected in series between the above power supplies, this allows the following: In the conventional rotor indicator using the rotation mechanism method, the electric type is used for rapid vertical movement of the liquid, such as the display being unobservable and the defect being unobservable, the liquid being caused by violent foaming, etc. The lighting indicator with the sensitive display structure of can be observed following.

B. The lighting indicator has a structure in which the liquid level is displayed by lighting the lamps in a column, so unlike the rotor indicator, it is extremely clear and the liquid level can be easily observed outdoors at night or in the dark.

C. With the conventional rotor indicator, it was not possible to take out the alarm or control switch function from the upper and lower parts of the liquid level, but the lighting indicator is required by the observer from an arbitrary upper or lower liquid level point. It is also possible to easily take out the alarm or control switch function.

[0035]

[Effect of device]

 As described above, the present invention is a lighting indicator for indicating the position of the liquid surface 9 by the vertical movement of the magnet 7 provided on the float 6 which follows the liquid surface 9 inside the liquid column tube 4 which is a non-magnetic material. The lighting indicator 11 is a direct current connecting a plurality of light emitting diodes 14a to 14n arranged in a vertical direction at regular intervals along the vertical direction of the liquid column tube and the light emitting diodes connected in series. A lighting indicator having a constant current power supply 16 and a plurality of magnetic sensors 13a to 13n arranged vertically corresponding to the respective light emitting diodes and connected in parallel to the DC constant current power supply 16. Therefore, according to this, since the liquid level display in the tank is structured by lighting the lamps in the column, unlike the rotor indicator, it is extremely clear and the liquid level can be easily displayed outdoors at night or in the dark. I can observe There is an effect that.

[Brief description of drawings]

FIG. 1 is an explanatory view of a conventional magnet type liquid level gauge with a rotor indicator.

FIG. 2 is an explanatory diagram of a conventional rotor indicator.

FIG. 3 is an explanatory diagram of a rotor portion of a rotor indicator of a conventional example.

FIG. 4 is an explanatory view of a magnet type liquid level gauge with a lighting indicator according to an embodiment of the present invention.

FIG. 5 is a basic principle diagram of a lighting indicator according to an embodiment of the present invention.

FIG. 6 is a lamp layout view of a lighting indicator according to another embodiment of the present invention.

FIG. 7 is a detailed circuit explanatory diagram of a lighting indicator of the embodiment shown in FIG.

[Explanation of symbols]

11 ... Lighting indicator 12 ... Case 13a-13n ... Reed switch 14a-14n
… Light emitting diode 15… Control box 16… DC constant current power supply

Claims (2)

[Scope of utility model registration request] 1. The liquid level (9) is produced by vertical movement of a magnet (7) provided on a float (6) that follows the liquid level (9) inside a liquid column tube (4) which is a non-magnetic material. A lighting indicator (11) for indicating a position, wherein the lighting indicator (11) is composed of a plurality of light emitting diodes (14a) vertically arranged at regular intervals along the vertical direction of the liquid column tube. ~ (14n)
A DC constant current power source (16) for connecting the respective light emitting diodes in series, and a large number arranged in the vertical direction corresponding to the respective light emitting diodes and connected in parallel to the DC constant current power source (16). Individual magnetic sensor (13a)
A lighting indicator for a magnet type liquid level gauge, which has (13n). 2. The liquid level (9) is caused by the vertical movement of a magnet (7) provided on a float (6) that follows the liquid level (9) inside a liquid column tube (4) which is a non-magnetic material. A lighting indicator (11) for indicating a position, wherein the lighting indicator (11) is composed of a plurality of light emitting diodes (14a) vertically arranged at regular intervals along the vertical direction of the liquid column tube. ~ (14n)
A DC constant current power source (16) for connecting the respective light emitting diodes in series, and a large number arranged in the vertical direction corresponding to the respective light emitting diodes and connected in parallel to the DC constant current power source (16). Individual magnetic sensor (13a)
(13n), the light emitting diodes (14a) to (14n) rows arranged vertically, and the magnetic sensor (13a).
~ (13n) A lighting indicator for a magnet type liquid level gauge, characterized in that a relay circuit for preventing over-learning of liquid level display is inserted in the lower part or the upper part of the array circuit.