JPS5821484Y2 - Storage battery liquid level detection device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a liquid level detection device for a storage battery, and in particular, the central part of the liquid spout in which a contact electrode for detecting the liquid level is embedded, and the screw part of the liquid spout that engages with the liquid opening of the storage battery container. This relates to a structure that integrates the

Conventionally, in a storage battery liquid level detection device in which a contact electrode for liquid level detection is provided integrally with a liquid port plug, for example, US Pat.
As disclosed in the specification of No. 891465, the center part of the liquid spout in which the contact electrode and a part of the lead wire connected thereto are embedded is formed separately from the liquid spout screw part, and when the liquid spout plug is attached or removed, The center portion of the liquid port plug, which was loosely fitted into the threaded portion, remained stationary to prevent twisting of the lead wire.

However, with this structure, the center part of the liquid port plug and the screw part are loosely fitted, so the play in the loosely fitting part becomes large especially at high temperatures, resulting in a seal failure in this part, and vibrations of the storage battery cause the electrolyte or the There are problems such as droplets leaking outside and measurement errors.

In addition, even if a splash-proof member is provided between the center part of the liquid spout plug and the threaded part, the threaded part and the center part fit loosely into each other, making it difficult to seal and making the seal structure complicated. .

Furthermore, since the center part of the liquid spout plug and the threaded part are manufactured separately, there is a drawback that productivity is low and costs are high.

The present invention has been made in view of the above points, and provides a liquid level detection device for a storage battery equipped with a liquid port plug with a liquid level detection electrode that can reliably prevent electrolyte leakage, has good productivity, and is inexpensive. The purpose is to

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

Fig. 1 shows the state in which the liquid level detection device according to the present invention is attached to a storage battery, where 1 is a storage battery container consisting of an upper container 1a and a lower container 1°, 2 is an electrode plate, and 3 is a plurality of electrode plates 2. One pole terminal 4 is the other pole terminal, and has a plurality of electrode plates (not shown) adjacent to the electrode plate 2 with a partition wall 5 interposed therebetween.

6 is an electrolytic solution, 7 is a storage battery gas chamber, 8 is a liquid port provided in the upper container 1a, and 9 is a liquid port plug.

2 to 4 are detailed explanatory diagrams of an embodiment of the liquid level detection device according to the present invention, in which 10 is a contact electrode, 11 is a lead wire, and 1
Reference numeral 2 denotes a central part of the liquid spout, 13 a threaded part of the liquid spout, 14 an annular gap provided between the central part 12 and the threaded part 13, and 15
1 is an exhaust hole, 16 is a sealing material such as rubber, 17 is an anti-corrosion adhesive such as vinyl paint, 18 is an annular groove provided on the inner circumference of the threaded portion 13, 19 is a donut-shaped splash-proof member, 20 is a connector, Reference numeral 21 denotes a non-slip convex portion provided on the outer periphery of the liquid port stopper 9.

The liquid port stopper 9 shown in FIGS. 2 to 4 is attached to the liquid port 8 of the storage battery container 1 with its threaded portion 13, and is attached to the liquid port 8 of the storage battery container 1 with a sealing material 16.
To prevent liquid leakage from between 3 and liquid port 8.

When manufacturing the liquid spout plug 9, the contact electrode 10 made of an acid-resistant conductive material such as a lead alloy and the core wire 118 of the lead wire 11 coated with polypropylene or the like are connected in advance to the terminal end 10 of the electrode 10.
They are joined by soldering or welding in step a, and a rust-preventive adhesive 17 is applied to the joint.

The center part 12 of the liquid spout plug and the screw part 13 are integrally formed of an acid-resistant insulating material such as polypropylene so that their upper ends are connected, and a contact electrode 10 and a lead wire connected thereto are connected to the center part 12. Part of No. 11 will be buried.

The central portion 12 is formed so that only the tip portion 105 of the electrode 10 is exposed and has a retaper over the entire length to facilitate die cutting.

Further, the inner periphery of the threaded portion 13 is also tapered to facilitate mold removal.

The exhaust hole 15 is provided at the uppermost portion where the central portion 12 and the threaded portion 13 are connected, and the gas chamber 7 communicates with the atmosphere through the exhaust hole 15.

Therefore, gas generated from the electrolytic solution 6 during charging of the storage battery is discharged to the outside without remaining, and light gases such as hydrogen can also be completely ventilated.

The donut-shaped splash-proof member 19 is a baffle plate made of an acid-resistant material such as polypropylene to prevent the electrolyte 6 or its splashes from leaking to the outside through the exhaust hole 15 due to the vibration of the storage battery, and has a large diameter. Part 19. The small diameter part 19e is fitted into the annular groove 18 of the threaded part 13 and the small diameter part 19e is fitted into the central part 12, respectively, so that the small diameter part 19e is fitted to the lower part of the gap 14.

In FIG. 3, this splash-proof member 19 is shown as a lower donut plate 19.
, the upper donut plate 19b is stacked in two stages, and the hollow cylindrical body 1
It is integrally formed through 9c.

19f is the lower donut plate 19. With ventilation holes provided in
This ventilation hole 19f is arranged at a position different from that of the exhaust hole 15.

In the liquid level detection device configured in this manner, even if the electrolyte 6 or its splashes reach the vicinity of the liquid opening 8 during vibration of the storage battery, the lower donut plate 19 of the splash-proof member 19 is first detected. Most of them fall.

Vent hole 19. The droplets rushing from the upper donut plate 19b
Since the liquid hits and falls, leakage of liquid from the exhaust hole 15 can be reliably prevented.

In this case, since the small diameter part 198 of the cylindrical part 19c is in contact with the stepped part 12a provided in the liquid spout central part 12 or the tapered surface of the central part 12, the electrolytic solution or its droplets leak upward from there. Very rarely.

The height of the cylindrical portion 19o can be selected so as to obtain a sufficient splash-proof effect.

The upper donut plate 195 may be omitted if the vibration of the storage battery is small.

5 to 7 are explanatory diagrams of other embodiments, and the same parts as in FIGS. 2 to 4 are designated by the same reference numerals.

In this embodiment, the portion of the gap 14 above the donut-shaped splash-proof member 19 is divided into two chambers by a vertical partition wall 22, and the exhaust hole 15 is provided in one chamber, and the donut-shaped splash-proof member 19 is provided in the other chamber. The ventilation holes 19f are opened respectively.

The partition wall 22 has a vent hole 228, and gas from the vent hole 19r flows through the vent hole 22° to the exhaust hole 15 as shown by the arrow in FIG. It is double blocked by the splash member 19 and the partition wall 22, and leakage of liquid from the exhaust hole 15 can be reliably prevented.

According to this configuration, the donut-shaped splash-proof member 19 only needs to be one plate, which simplifies the structure.

In this case, it is desirable that the small diameter portion 19e of the splash-proof member 19 be in contact with the liquid spout center portion 12 without any gap.

In each of the above embodiments, the diameter of the contact electrode 10 is 1 to 2 m.
m, the electrode embedding length in the center part 12 of the liquid spout is 40 to 45 m.
The embedded length of the lead wire 11 is preferably 7 mm or more, thereby providing sufficient strength against twisting of the lead wire and external vibration.

Next, the operation of the liquid level drop warning circuit using this liquid level detection device will be explained with reference to FIG.

In FIG. 8, when the contact electrode 10 is in contact with the electrolyte 6, when the ignition switch 23 is turned on, the transistor (inverter) 24 becomes conductive and the base of the transistor (power amplifier) 25 becomes zero potential. Transistor 25 is cut off and therefore warning light 26 is not illuminated.

Now, when the liquid level falls below the set value, the electrode 10 and the electrolyte 6 are separated and the transistor 24 is cut off, and the base of the transistor 25 becomes a positive potential, so the transistor 25 becomes conductive and the warning light 26 is turned on. lights up.

This allows the driver to know that the liquid level has decreased.

This circuit is a surge protection circuit 27 in which a diode and an electrolytic capacitor are connected in parallel to the collector side of a transistor 24.
Therefore, even if there is a surge or noise from the alternator or ignition system in the power supply section, the transistor 24 operates stably.

Furthermore, since the Zener diode 28 is provided on the collector side of the transistor 25, the transistor 25 can be protected from excessive voltage.

Furthermore, a capacitor 29 is provided as a damper to prevent sudden fluctuations in the liquid level.

As explained above, in the present invention, the center part of the liquid spout, in which the contact electrode and a part of the lead wire connected thereto are embedded, and the liquid spout screw part are integrally formed with an acid-resistant insulating material such as polypropylene. Eliminating the fitting part allows for high productivity and low-cost wheat cultivation, and the simple donut-shaped splash-proof member reliably prevents leakage of electrolyte from the exhaust hole, thereby preventing leakage of electrode voltage into the container and lead Since breakage of wires etc. due to rust can be prevented, the accuracy of liquid level detection can be improved, which is highly effective.

Regarding the twisting of the lead wire, by setting the length l of the lead wire shown in FIG. Even if a corresponding rotation (3 to 4 rotations) is applied to the liquid spout,
The lead wires are not damaged by twisting, and there is no problem in practical use.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of a storage battery equipped with a liquid level detection device according to the present invention, FIG. 2 is a side view of an embodiment of the liquid level detection device according to the present invention, FIG. 3 is a side sectional view thereof, and FIG. The figure is a top view, FIG. 5 is a side sectional view of another embodiment, and FIG. 6 is an A-A thereof.
7 is a sectional view taken along the line B-B, and FIG. 8 is an example of a low liquid level warning circuit using this liquid level detection device. 1: Storage battery container, 6: Electrolyte, 8: Liquid port, 9: Liquid port plug,
10: Contact electrode, 11: Lead wire, 12: Liquid port plug center part, 13: Liquid port plug threaded part, 14: Gap, 15: Exhaust hole, 1
9: Donut-shaped splash-proof member, 19. : large diameter part, 19o: small diameter part, 19f: ventilation hole, 22: partition wall, 22a: ventilation hole.

Claims (3)

[Scope of utility model registration request] (1) In a storage battery liquid level detection device in which a contact electrode for detecting the liquid level of a storage battery is integrated with a liquid spout, the contact electrode and a part of the lead wire connected to it are buried in the center of the liquid spout. Then, the center part of the liquid spout and the screw part of the liquid spout that engages with the liquid opening of the storage battery container are integrally formed with an acid-resistant insulating material so that their upper ends are connected, and the liquid An exhaust hole is provided near the connecting part between the center part of the liquid spout and the threaded part of the liquid spout, and a donut-shaped splash-proof member with a ventilation hole is installed in the small diameter part of the gap between the central part of the liquid spout and the threaded part of the liquid spout. 1. A liquid level detection device for a storage battery, characterized in that a large diameter portion is fitted into the center of the liquid port plug, and a large diameter portion is fitted into a threaded portion of the liquid port plug. (2) The liquid level detection device for a storage battery according to claim 1, wherein the donut-shaped splash-proof member is stacked in two layers. (3) The part of the gap above the donut-shaped splash-proof member is divided into two chambers by a vertical partition wall, and one of the chambers has the exhaust hole, and the other chamber has the ventilation hole of the donut-shaped splash-proof member. The liquid level detection device for a storage battery according to claim 1, wherein the two chambers are connected to each other by a vent hole provided in the partition wall.