JPH0234587Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an oil level gauge with an alarm that automatically sounds an alarm when the amount of oil in the oil tank becomes low.

[Problems to be solved by conventional technology and ideas] Conventionally, in cold regions, an oil tank storing fuel oil such as kerosene or heavy oil is installed outdoors, and this fuel oil is sent indoors through an oil pipe. Many heating systems are used, and in order to check the amount of oil in the oil tank with this type of heating system, you can simply look at the indicator on the oil level gauge attached to the outdoor oil tank. It is troublesome to have to go in and out of the cold outdoors, and the oil level gauge tends to get snow, ice, and dirt, which often makes it difficult to read it.

For this reason, an oil level gauge has been developed that uses a reed switch to automatically issue an alarm when the oil level is low.

In these known oil level gauges with an automatic alarm device, a magnet and a reed switch are installed in the pointer case of the oil level gauge.

On the other hand, since a device for rotating the pointer according to an increase or decrease in the amount of oil must be installed in the oil tank, the pointer shaft is provided so as to penetrate through the scale plate (bottom plate) of the pointer case.

Therefore, the vaporized kerosene filling the oil tank often leaks into the pointer case, and in that case, the vaporized kerosene comes into contact with the reed switch.

If a spark were accidentally emitted from the reed switch in this condition, there is a danger of an explosion.

The present invention proposes an oil level gauge with an alarm to prevent this danger of explosion.

[Means for solving problems]

The structure of the present invention will be explained in detail with reference to the accompanying drawings showing one embodiment.

In the oil level gauge a that indicates the oil level in the oil tank 1 with the pointer 2, the pointer 2 is placed inside the pointer case 7 having the mounting part 6.
A magnet 17 is attached to a portion of the pointer 2 that changes its position relative to the pointer case 7 as the pointer 2 rotates, and a transparent protective plate 15 that allows the pointer 2 rotating within the pointer case 7 to be seen through is attached to the pointer case. A switch support case 18 is attached to the center of the upper surface of the protection plate 15 so that the oil level scale 14 inside the pointer case 7 can be seen through the protection plate 15. A reed switch 4 operated by a magnet 17 attached to the pointer 2 is provided,
When the pointer 2 is located between the magnet 17 and the reed switch 4 at a predetermined amount or more, the magnet 17
A magnetic shielding plate 19 is provided to prevent the magnetic force from reaching the reed switch 4, and when the pointer 2 is located below the above-mentioned slight residual oil amount, the pointer 2 is connected to the reed switch 4 via the reed switch 4 by the magnetic force of the magnet 17. This device is characterized in that the shape of the magnetic shielding plate 19 is set so as to activate the alarm device 3.

[Effect]

To explain in detail based on the illustrated embodiment, the oil level gauge a of the present invention has a shaft rod 8 in the center of a pointer case 7 which has a mounting part 6 attached to the mounting port 5 of the oil tank 1 formed at the lower part of the circumference. This shaft rod 8
A twisted strip plate is installed vertically at the lower end of the float 10, and this twisted strip plate 9 is inserted into the long hole 11 provided in the center of the float 10.
0 and the torsion band plate 9 are inserted so as to perform a relative torsional movement as the float 10 moves up and down, and a guide rod 12 is suspended from the lower surface of the pointer case 7, and the guide rod 12 is attached to the float 10. Drilled guide hole 1
3 so that the float 10 moves up and down without twisting, and an oil volume scale 14 is attached to the upper peripheral edge of the pointer case 7, and the pointer 2 pointing to this oil volume scale 14 is attached to the shaft. It is fixed to the upper end of the rod 8.

Therefore, when the float 10 rises or descends due to an increase or decrease in the amount of oil, the twisted strip plate 9 has to rotate, and as the twisted strip plate rotates, the pointer 2 rotates, causing the oil amount to change. The scale 14 indicates the amount of oil in the oil tank 1.

The present invention employs an automatic alarm using a reed switch 4 in such an oil level gauge. The magnet 17 is attached so that the position of the magnet 17 moves along a circular locus as the pointer 2 rotates.

The reed switch 4 operated by the magnet 17 is not provided inside the pointer case 7, and the transparent protection plate 15
The pointer 2 is provided within the switch support case 18 provided on the top surface, and the pointer 2 is
If the pointer 2 and magnet 17 are provided in a sealed case b formed by the pointer case 7 and the protection plate 15, the reed switch 4 is installed in this case. Since the reed switch 4 is provided outside the case b, even if vaporized kerosene were to flow through the rod 8 of the pointer 2 and fill the case b, it would not come into contact with the reed switch 4 provided outside the case b. Therefore, there is no danger of explosion.

Furthermore, a magnetic shielding plate 19 is provided between the pointer 2 and the reed switch 4, and the shape of the magnetic shielding plate 19 is such that the magnetic force of the magnet 17 is applied to the reed switch 4 when the pointer 2 approaches a predetermined amount of residual oil. The setting is such that the magnetic force of the magnet 17 does not act on the reed switch 4 when the pointer 2 rotates beyond a small amount of residual oil, so the rotation of the pointer 2 moves the position of the magnet 17 and the magnet 17 becomes magnetic. When it comes off the shielding plate 19, the reed switch 4 is activated, and the alarm 3 installed at an appropriate location will sound.

The shape and mounting position of the magnetic shielding plate 19 are determined by the magnet 17.
The design takes into account various conditions such as the mounting position of the reed switch 4, the shape and mounting position of the reed switch 4, and the setting of the slight amount of residual oil that will sound the alarm.

Knowing that the oil is running out due to this alarm, replenish the fuel, and when the indication of the pointer 2 becomes more than the predetermined amount of remaining oil, the pointer 2 will be in the positional relationship as shown by the imaginary line in Figure 3, and the magnet 17 will be shielded from the magnetic shield. The reed switch 4 does not operate because it is located directly below the plate 19 and the magnetic force of the magnet 17 is prevented from reaching the reed switch 4 by the magnetic shielding plate 19.

Therefore, the buzzer circuit 21 is not activated, the alarm 3 stops, and when the pointer 2 again indicates a predetermined small amount of remaining oil, the alarm automatically sounds.

〔Example〕

The magnetic shielding plate 19 provided between the magnet 17 and the reed switch 4 is attached to the upper surface of the magnetic shielding plate 19 in the embodiment shown in the drawings.

In the oil level gauge a, the mechanism for rotating the pointer 2 is not limited to the embodiment. Code 22 in the figure
is a battery.

[Effect of idea]

Since the present invention is configured as described above, the magnet 17 is attached to the pointer 2 inside the case b, but the reed switch is not installed inside the case b but is attached outside the case b, that is, on the protective plate 15. Since the reed switch 4 is installed inside the switch support case 18, it is installed outside the case b of the oil level gauge a, which is isolated by the protective plate 15, so that even if vaporized kerosene enters the case b, Even if it is full, the vaporized kerosene is surely prevented from touching the reed switch 4.

Therefore, unlike the conventional oil level gauge a in which the reed switch 4 is provided in the case b, there is no risk of vaporized kerosene touching the reed switch 4 and causing an explosion, resulting in a safe oil level gauge a. Further, since the switch support case 18 is provided at the center of the protection plate 15, the oil level scale 14 in the pointer case 7 is not obscured by the switch support case 18.

In addition, since the magnetic shielding plate 19 is provided between the magnet and the reed switch 4, the selection of the alarm timing using the magnetic shielding plate 19 can be made well and easily by setting the shape of the magnetic shielding plate 19 and the mounting positions of the magnet 17 and the reed switch 4. This is an oil level gauge with an alarm that is extremely practical.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; Fig. 1 is an exploded perspective view of the product, Fig. 2 is a sectional view of the product in use, and Fig. 3 is a partially cutaway plan view of the oil gauge. It is. a...Oil level gauge, 1...Oil tank, 2...Pointer,
3... Alarm, 4... Reed switch, 6... Mounting part, 7... Pointer case, 14... Oil level scale, 1
5... Protective plate, 17... Magnet, 18... Switch support case, 19... Magnetic shielding plate.

Claims (1)

[Scope of utility model registration request] In an oil gauge that indicates the amount of oil in an oil tank with a pointer,
A pointer is provided in a pointer case that has a mounting part, a magnet is attached to the pointer part whose position relative to the pointer case changes as the pointer rotates, and a transparent protection plate is provided that allows the pointer to be seen through as it rotates inside the pointer case. A switch support case is attached to the center of the upper surface of this protection plate in such a manner that the oil level scale inside the pointer case can be seen through the protection plate, and a switch support case is attached to the pointer within this switch support case. A reed switch operated by a magnet is provided, and a magnetic shielding plate is provided between the magnet and the reed switch to prevent the magnetic force of the magnet from reaching the reed switch when the pointer is located above a predetermined amount of residual oil. , an alarm characterized in that the shape of the magnetic shielding plate is set so that when the pointer is located below the slight residual oil amount, a reed switch is activated by the magnetic force of a magnet and an alarm connected to the reed switch is activated. Oil level gauge with instrument.