JPH044365Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for detecting the specific gravity of an electrolyte for a lead-acid battery, and more particularly to a device for detecting changes in the specific gravity of an electrolyte based on the propagation velocity of ultrasonic waves in the electrolyte.

Conventionally, devices have been developed that use ultrasonic waves as a means of measuring the concentration of liquid, and that the speed at which the ultrasonic waves propagate through the liquid changes depending on the concentration and temperature of the liquid. It is used.

However, when using the Sing-A-Rand method to measure the concentration, ie, specific gravity, of dilute sulfuric acid, which is the electrolyte of a lead-acid battery, using the above-mentioned device, there were the following disadvantages.

In other words, the Sing-A-Rand method is a method in which an ultrasonic burst is transmitted into the electrolyte, and after receiving it, it is transmitted and received again a few seconds later. Because it is narrow, the ultrasonic waves may be reflected many times on the side wall of the inner container, disrupting the transmission and receiving of sound waves, and there is a risk that accurate specific gravity detection may not be possible. An ultrasonic transmitting transducer and a receiving transducer are arranged at opposing positions on the side wall of the inner container, and the receiving transducer receives the ultrasonic waves transmitted from the transmitting transducer into the electrolyte to be tested at regular intervals.
At this time, the ultrasonic wave is reflected from the side wall where the receiving transducer is placed, returns to the side wall where the transmitting transducer is placed, and is further reflected there and is received by the receiving transducer again, transmitting the erroneous sound wave signal to the receiving transducer. That's what I'm going to tell you.

In view of the above points, the present invention is a lead-acid battery that prevents the ultrasonic waves emitted once from being repeatedly reflected on the side wall of the inner container containing the electrolyte to be tested, and enables accurate detection of the specific gravity of the electrolyte. The purpose of the present invention is to provide an electrolyte specific gravity detection device.

In order to achieve the above object, the present invention has the following configuration. In other words, an ultrasonic transmitting transducer and a receiving transducer are arranged at opposite positions on the side wall of the inner container containing the electrolyte to be tested, and a damping plate is arranged at an angle other than perpendicular to the line connecting the two. It is interposed between the transmitting vibrator and the receiving vibrator.

The ultrasonic waves sent from the transmitting transducer into the electrolyte to be tested are reflected by the damping plate at angles other than the right angle, and the ultrasonic waves that reach the receiving transducer at the opposite position are transmitted through the damping plate. Since the part of the reflected light is weakened, it is possible to eliminate the harmful effects of repeated reflections and perform accurate specific gravity measurements.

An example of the present invention will be described below.

Inside a cylindrical outer container 1 made of an acid-resistant material such as synthetic resin, a prismatic inner container 2 made of glass, acid-resistant synthetic resin, or the like and whose bottom surface is open to the outside of the outer container 1 is arranged. On the opposing outer walls of the inner container 2, an ultrasonic transmitting transducer 3 and a receiving transducer 4 are placed, and a damping material made of acid-resistant synthetic resin or the like is placed at an angle other than perpendicular to the line connecting the two. A plate 5 is interposed between the transmitting vibrator 3 and the receiving vibrator 4. The drawing shows a rectangular cylindrical inner container 2 arranged along a diagonal line.

The space between the outer container 1 and the inner container 2 is filled with a filler 6 made of epoxy resin or the like, and a gas discharge port 7 provided through the side walls of the outer container 1 and the inner container 2 and a transmitting vibrator are filled. 3. The receiving transducer 4 is sealed liquid-tight. A temperature measuring element 8 is disposed inside the inner container 2 so as to penetrate the upper surface of the inner container 2 in a liquid-tight manner. Lead wires 9 from the transmitting transducer 3 and the receiving transducer 4 and lead wires 10 from the temperature measuring element 8 are guided to the outside through the filler 6 and connected to an ultrasonic transducer and a temperature display device, respectively. ing.

In the above device, when it is immersed in the electrolytic solution of a lead-acid battery, the electrolytic solution flows through the opening 11 at the bottom of the inner container 2.
The electrolyte then flows into the inner container 2 and fills it, and this becomes the electrolyte solution 12 to be tested. As shown in FIG.
A portion of the ultrasonic wave is reflected by the damping plate 5 and propagated in the direction of arrow B, and the weakened ultrasonic wave that is not reflected by the damping plate 5 but passes through it reaches the receiving transducer 4. The specific gravity is measured by utilizing the fact that the time it takes for the ultrasonic waves to reach the receiving transducer 4 from the transmitting transducer 3 changes depending on the specific gravity of the electrolytic solution 12 to be tested. The ultrasonic wave that reaches the receiving transducer 4 and is reflected from the side wall surface on which the receiving transducer 4 is placed is further reflected by the damping plate 5 and propagates in the direction of arrow C, so that the reflected ultrasonic wave returns to the receiving transducer 4. This prevents erroneous sound wave vibrations from being transmitted to the receiving transducer 4 when transmitting sound waves using the single-land method.

As mentioned above, in this invention, the ultrasonic waves sent out from the transmitting transducer are weakened by a damping plate before reaching the receiving transducer, and the ultrasonic waves reflected from the side wall surface where the receiving transducer is placed are further weakened by the damping plate. The practical value of the present invention is extremely great in that the reflected ultrasonic waves do not reach the receiving transducer again, and accurate and stable specific gravity measurement can be performed.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a main part showing an example of the present invention, and FIG. 2 is a sectional view taken along line A-A' in FIG. 1 is an outer container, 2 is an inner container, 3 is a transmitting vibrator, 4
1 is a receiving transducer, 5 is a damping plate, 6 is a filler, 7 is a gas discharge port, 11 is an opening, and 12 is a test electrolyte.

Claims (1)

[Scope of utility model registration request] An ultrasonic transmitting transducer and a receiving transducer are positioned at opposing positions on the side wall of an inner container containing a test electrolyte, and a damping plate is positioned at an angle other than perpendicular to a line connecting the transmitting transducer and the receiving transducer. A device for detecting the specific gravity of an electrolyte in a lead-acid battery, which is interposed between a transmitting transducer and a receiving transducer.