JP4517223B2 - LIQUID LEAK DETECTION DEVICE EQUIPPED WITH A STEEL TYPE SENSOR - Google Patents

Description

  The present invention relates to a detection sensor for detecting an acidic liquid leaking from a container, for example, an electrolytic solution (dilute sulfuric acid liquid) leaking from a battery such as a lead storage battery, and a liquid leak detection comprising the sensor. Relates to the device.

  An uninterruptible power supply is installed in hospitals, schools, factories, etc., and this uninterruptible power supply is equipped with many lead storage batteries.

FIG. 11 is a block diagram illustrating a circuit example of the uninterruptible power supply.
As shown in the figure, the uninterruptible power supply includes a rectifier circuit 13, a control circuit 14, and an inverter 15 for charging and discharging a lead storage battery (battery) 12 between a commercial AC power supply 11 and a load. Is provided.

  Specifically, unless the commercial AC power supply 11 is interrupted, the commercial AC voltage AC is converted into a DC voltage DC by the rectifier circuit 13 and the lead storage battery 12 is charged by the DC voltage DC, while the DC voltage DC is inverted. -It is converted into an alternating voltage AC by the data 15 and supplied to the load.

When the commercial AC power supply 11 fails, the control circuit 14 automatically switches the lead storage battery 12 from charging to discharging.
As a result, the lead storage battery 12 serves as a standby power source, and the direct current voltage DC output from the lead storage battery 12 is converted into the alternating current voltage AC by the inverter 15 and supplied to the load.

In the uninterruptible power supply described above, when the commercial AC power supply 11 recovers from the power failure, the control circuit 14 is switched to the charging operation and the lead storage battery 12 is charged.
This type of uninterruptible power supply is configured as a single battery unit in which a large number of lead storage batteries 12 are installed in a frame 16 and connected in series.

  The lead storage battery 12 as described above is normally charged as a reserve power supply, but the internal pressure of the lead storage battery 12 changes due to deficiencies due to installation work, peculiar failures, use over time, and the like. The sealing performance between the terminal portion and the battery container may be reduced, or a fine crack may be generated in the battery container, and the electrolyte may leak out.

  The leaked electrolytic solution is received by the frame 16 and prevented from flowing out of the frame 16.

However, when the underframe 16 is made of metal, the electrode plate in the lead storage battery 12 and the underframe 16 are electrically connected via the leaked electrolyte solution 17, and as shown by the broken line arrow in the figure, the commercial AC power supply 11, a rectifier circuit 13, a lead storage battery 12, and a frame 16 are formed.
Since the electrolytic solution has a small specific resistance, a large current flows through the short circuit and a spark is generated.

If the underframe 16 is made of resin, conduction by the electrolytic solution 17 between the electrode plate of the lead storage battery 12 and the underframe 16 can be avoided.
However, when a plurality of lead storage batteries 12 leaks, a short circuit occurs through the electrolyte 17 leaking between the lead storage batteries 12, and a large current flows through the conductive portion of the electrolyte 17, causing a spark. Will occur.

  Since the spark generated as described above may cause a fire, the presence or absence of leakage of the electrolyte is visually checked. It requires a lot of labor and is not sufficient in safety.

  In order to solve this problem, there has already been proposed a liquid leakage detection device capable of detecting an electrolyte leakage of the lead storage battery 12 and preventing an accident due to the liquid leakage.

FIG. 12 is a circuit block diagram showing an uninterruptible power supply device provided with the above-described liquid leakage detection device.
The liquid leakage detection apparatus includes a monitoring unit 18 and a wiring sheet 19 as a detection sensor. The wiring sheet 19 is laid in a frame 16 and a lead storage battery 12 is installed on the upper surface of the wiring sheet 19. When the electrolyte solution leaks from the lead storage battery 12, the electrolyte solution flows into the surface of the wiring sheet 19.

As shown in FIG. 13, the wiring sheet 19 has a structure in which parallel line-shaped detection wirings 21 are formed by etching after bonding a copper foil plate on the surface of the plastic film 20 with an adhesive. Yes.
In this wiring sheet 19, the detection wiring 21 is fed by the power supply circuit 22.
That is, one of the detection wirings fed by the power feeding terminals 23a and 23b is used as a first electrode, and the other detection wiring fed by the power feeding terminals 24a and 24b is alternately arranged as a second electrode. .

An electrically insulating protective film 25 is applied on the surface of the wiring sheet 19.
This protective film 25 has the function of reacting and dissolving when the electrolyte leaked from the lead storage battery 12 flows on the surface of the wiring sheet 19 to permeate the electrolyte.

When the electrolytic solution adheres to the wiring sheet 19 configured as described above, each line of the detection wiring 21 is partially connected by the electrolytic solution, so that the resistance value of the detection wiring 21 changes.
The detection circuit 26 of the monitoring unit 18 detects the resistance change of the detection wiring 21 as a liquid leak, and the alarm device 27 such as a buzzer is operated by this detection.

  Specifically, a constant voltage (for example, DC voltage DC 5 volts) is always applied to the detection wiring 21 of the wiring sheet 19 from the power supply terminals 23a, 23b and 24a, 24b. A change in resistance that occurs when the electrolytic solution adheres to the battery 19 is detected as a change in detection voltage or detection current, and an alarm is issued.

The above-described liquid leakage detection device is an effective detection device in terms of safety measures because it can detect leakage of the electrolyte solution at an early stage and prevent an accident such as a fire due to the liquid leakage.
However, since this liquid leak detection device has a configuration in which the lead storage battery 12 is mounted on the wiring sheet 19 having a wide detection sensor, it is difficult to equip the existing uninterruptible power supply device. is there.

  Specifically, since the battery of the uninterruptible power supply apparatus that has already been installed is configured as one battery unit portion in which a number of lead storage batteries 12 are housed in a plurality of stages of rack frames, In order to configure the lead storage battery 12 to be placed on the wiring sheet 19, the battery unit portion is disassembled, the wiring sheet 19 is laid, and the battery unit portion is assembled again.

  Moreover, since the uninterruptible power supply devices are installed in various directions and there are many, it is practically difficult to lay the wiring sheet 19 as described above in each battery unit.

Application for Japanese Patent Application No. 2003-140399

  In the present invention, not only a newly installed uninterruptible power supply, but also an existing uninterruptible power supply can be easily installed to detect a battery-liquid leak or to detect an acid liquid tank leak. An object is to propose a detection sensor and a liquid leakage detection device including the sensor.

In order to achieve the above object, in the present invention, as a first invention, in a detection sensor for detecting an acidic liquid leaking from a container, a base made of an electrically insulating strip-shaped thin plate , and one surface of the base A common electrode portion that is elongated along one side of the base width along the length direction of the base, and extends in one direction of the base width with a predetermined interval from the common electrode portion. A plurality of relay electrode portions, a first electrode comprising a parallel electrode portion extending in parallel with the common electrode portion from each of the relay electrode portions, and an electrode provided on one surface of the base, A common electrode portion that is elongated along the length direction of the base toward the other side of the base width, and extends in the other direction of the base width with a predetermined interval from the common electrode portion, and the relay electrode of the first electrode Many formed in the middle of each part A second electrode comprising a relay electrode portion, a parallel electrode portion extending in parallel with the common electrode portion from each relay electrode portion, and in contact with the parallel electrode portion of the first electrode; and the first electrode A protective coating made of an acidic liquid-permeable electrical insulating material provided on one surface of the base including the second electrode, and a configuration in which the leaked acidic liquid flows in the width direction of the base; We propose a belt-like detection sensor characterized by the above.

As a second invention, in the belt-like detection sensor of the first invention described above, a flexible insulating sheet such as a plastic film is used as a base, and first and second electrodes are formed on one surface thereof. first a protective coating made of an electrically insulation material in which the one surface of the base including two electrodes, proposes a strip detection sensor, characterized in that it has a structure for covering the second electrode.

As a third invention, in the strip-shaped detection sensor of the first or second invention described above, the protective film made of the above-described acidic liquid-permeable electrical insulating material contains a polymer compound having a basic functional group. We propose a belt-shaped detection sensor characterized by comprising an electrical insulator.

As a fourth invention , in the strip-shaped detection sensor according to any one of the first to third inventions described above, a plurality of sets of electrodes in which the first and second electrodes described above are set as one set on one base surface. We propose a belt-like detection sensor characterized by the provision of

According to a fifth aspect of the present invention, there is provided a liquid leakage detection apparatus for detecting an electrolyte solution leaking from a storage battery , comprising: a base made of an electrically insulating strip-shaped thin plate; and an electrode provided on one surface of the base, the length of the base A common electrode portion that is elongated along the length direction toward one side of the base width, a plurality of relay electrode portions that extend from the common electrode portion in a direction of the base width with a predetermined interval, and each of the relays A first electrode comprising a parallel electrode portion extending in parallel with the common electrode portion from the electrode portion, and an electrode provided on one surface of the base, wherein the other of the base width along the length direction of the base A common electrode portion that is elongated toward the side, and a plurality of relay electrode portions that extend in the other direction of the base width at a predetermined interval from the common electrode portion and are formed in the middle of each relay electrode portion of the first electrode And common to each relay electrode section A second electrode comprising a parallel electrode portion extending parallel to the pole portion and in contact with the parallel electrode portion of the first electrode; and provided on one surface of the base including the first and second electrodes. A belt-shaped detection sensor comprising a protective coating made of an acid liquid permeable electrical insulating material is provided. Further, a feeding means for feeding power to the first and second electrodes, and detection in response to a resistance change of the belt-shaped detection sensor A detection means that operates, and an alarm means that responds to the detection operation of the detection means, and the belt-like detection sensor is disposed so that the longitudinal direction is perpendicular to the flow path of the electrolyte that leaks from the storage battery, Proposed is a liquid leak detection device characterized in that the detecting means detects a change in resistance of the belt-shaped detection sensor caused by the adhering electrolyte solution adhering to the belt-shaped detection sensor, and the alarm means is operated as an alarm. .

Since the belt-like detection sensor according to the first aspect of the invention has a narrow and long shape, the liquid leakage passage of a predetermined portion of the container serving as the liquid leakage passage or the shelf frame body in which the container is stored. It can be disposed in a place or the like.
The belt-like detection sensor can be attached by an adhesive or screwed.

As for the strip | belt-shaped detection sensor arrange | positioned as mentioned above, the leaked acidic liquid flows in the width direction.
That is, since the first and second electrodes of the belt-shaped detection sensor are mainly formed by the electrode portions extending in the length direction, the acidic liquid flows in a direction crossing the first and second electrodes.

  As a result, no matter which part of the belt-like detection sensor is attached to the acidic liquid, the protective coating penetrates, and the dissolved acidic liquid lowers the electrical insulation between the first and second electrodes, and changes resistance due to liquid leakage. This is a detection sensor that can be reliably detected.

In particular, the strip-shaped detection sensor, a relay electrode and the electrode portions while becomes a unit of the relay electrode of the second electrode of the first electrode.
That is, since this strip-shaped detection sensor is formed by continuously forming a large number of unitized electrode portions, it can be used by cutting at any position according to the arrangement distance.

The belt-like detection sensor of the second invention is a structural example of a flexible sensor that can be bent in accordance with the arrangement portion, and the belt-like detection sensor of the third invention is a material example of an electrical insulator that is preferable as a protective film. is there.

A strip-shaped detection sensor according to a fourth aspect of the invention is a detection sensor in which the number of electrodes is increased to improve detection accuracy.
A fifth aspect of the invention is a liquid leakage detection device configured to detect a liquid leakage of a storage battery by the belt-shaped detection sensor described above.

Next, an embodiment in which the present invention is implemented in an uninterruptible power supply will be described with reference to the drawings.
FIG. 1 is a simplified diagram showing a battery unit portion of an uninterruptible power supply.

This battery unit portion has a structure in which a large number of lead storage batteries 12 are placed on the cradle portions 30 a and 30 b of the shelf frame 30.
In addition, the lead storage battery 12 is accommodated so that the front side which has an electrode terminal turns sideways, and each lead storage battery 12 is connected in series.

Further, in this battery unit portion, a belt-like detection sensor 31a is disposed on the front surface of the cradle portion 30a of the shelf frame 30, and a belt-like detection sensor 31b is disposed on the front surface of the cradle portion 30b.
That is, since the cradle parts 30a and 30b have a horizontally long front shape, as shown in the figure, the belt-like detection sensors 31a and 31b are attached to the front face of the cradle parts 30a and 30b.
The belt-like detection sensors 31a and 31b can be attached with an adhesive or fixed with screws or the like, and a double-sided adhesive tape is attached to the back surface of the base 36. -You may make it adhere | attach by a group.

The belt-shaped detection sensors 31a and 31b are supplied with a constant voltage (for example, DC voltage DC 5 volts) by a power supply circuit 33 of a liquid leakage detection device similar to the liquid leakage detection device of the conventional example.
When the electrolyte leaked from the lead storage battery 12 adheres to one or both of the belt-like detection sensors 31a and 31b, the detection circuit 34 changes the resistance generated in the belt-like detection sensors 31a and / or 31b. Is detected and the alarm device 35 is operated.
The alarm device 35 may include an alarm transmission system in addition to a lamp, a buzzer, a siren, and the like.

Since the band-shaped detection sensors 31a and 31b described above have the same configuration, the band-shaped detection sensor 31a shown in an enlarged manner in FIG. 2 will be described.
2A is a partially cutaway front view of the belt-like detection sensor-31a, and FIG. 2B is a cross-sectional view taken along line AA in FIG. 2A.

  As shown in the figure, the belt-like detection sensor 31a has a first electrode 37 and a second electrode 38 formed on one surface of a base 36 made of a belt-like thin plate, and further includes a first electrode 37 and a second electrode 38. The protective coating 39 is integrally provided on almost the entire surface of the base including

  The base 36 is a material that blocks the electrolytic solution and is formed of a material having flame retardancy in a sheet shape. For example, a flame retardant polyester, a flame retardant polyimide, or the like can be used. .

The first electrode 37 and the second electrode 38 can be formed on the surface of the base 36 by plating, printing, or a combination of conductive materials such as copper, aluminum, and iron.
In addition, about the 1st electrode 37 and the 2nd electrode 38, after bonding a copper foil board with the adhesive agent on the surface of the base 36, an electrode pattern can also be formed by an etching process.

  The first electrode 37 has a common electrode portion 37a formed along the length direction of the base on one side of the base 36, and a predetermined interval from the common electrode portion 37a in the base width direction. The electrode pattern is composed of a number of relay electrode portions 37b provided and extended, and a plurality of parallel electrode portions 37c extended from each relay electrode portion 37b in parallel with the common electrode portion 37a.

  The second electrode 38 has a common electrode portion 38a formed linearly in the length direction of the base on the other side of the base 36, and a predetermined interval from the common electrode portion 38a in the base width direction. A plurality of relay electrode portions 38b formed in the middle of each of the relay electrode portions 37b of the first electrode 37, and extending from each relay electrode portion 38b in parallel to the common electrode portion 38a. The electrode pattern is composed of a plurality of parallel electrode portions 38 c in contact with the parallel electrode portion 37 c of the electrode 37.

In the first electrode 37 and the second electrode 38 formed as described above, an electrode pattern that forms one unit is formed between the relay electrode portion 37b and the relay electrode portion 38b as shown in the region D in the drawing. The
In other words, the strip-shaped detection sensor 31a is formed by continuously forming a large number of unitized electrode patterns formed by the relay electrode portions 37b and 38b. -No loss of functionality.

Therefore, it becomes a convenient belt-like detection sensor 31a that can be cut into a sensor length corresponding to the distance of the portion to be disposed.
A power supply terminal 37d of the first electrode 37 and a power supply terminal 38d of the second electrode 38 are provided at one end of the base 36, and a connector 40 is soldered to these power supply terminals 37d and 38d. Power is supplied through

Furthermore, the electrode part space | interval of the 1st electrode 37 and the 2nd electrode 38 can be 0.1 mm-1.6 mm, Preferably, it is 0.2 mm-1.2 mm, More preferably, it is 0.5 mm- 1.0 mm.
An electrode spacing of 0.1 mm or less is not preferable because it makes it difficult to create electrodes and causes problems such as short circuits that occur during electrode creation.

Further, when the electrode interval is set to 1.6 mm or more, even if the acidic liquid adheres to the detection sensor 31a , the acidic liquid often does not stay between the electrodes.

Further, if the length of the electrode pattern of one unit is shortened, the loss of detection function due to cutting is reduced.
Accordingly, the length of the electrode pattern of one unit can be arbitrarily set, but is preferably 0.5 mm to 200 mm, and more preferably 10 mm to 100 mm.

If one unit is 0.5 mm or less, the electrode width and the circuit pattern become extremely fine, which leads to an increase in cost due to the requirement for accuracy, and it is not preferable and it is not necessary to make it substantially 0.5 mm or less. it is conceivable that.
If it is 200 mm or more, the belt-shaped detection sensor 31 a having a maximum length of 200 mm or less is not preferable depending on the cutting site of the terminal unit to be cut, and the detection function is lost.

Moreover, although the electrode structure which makes the 1st electrode 37 and the 2nd electrode 38 1 set may be sufficient, Preferably 3 or more sets, More preferably, 5 or more sets of electrodes are provided.
In the case of one set of electrodes, there is a possibility that the acidic liquid may not stay between the electrodes. However, if the number of sets is three or more, the probability that the acidic liquid stays increases.

  However, as the number of electrode sets is increased, the width of the band-shaped detection sensor 31a becomes wider and it becomes difficult to install in a narrow part. More preferably, it is within 8 sets, and further preferably within 6 sets.

On the other hand, the protective coating 39 is made of an electrical insulating material that decreases in electrical insulation in response to an acidic solution such as an electrolytic solution.
The protective coating 39 is a coating formed by coating an electric insulating material on the surface of the base 36, the first electrode 37, and the second electrode 38 and drying it, or a coating sheet formed of an electric insulating material. The base plate 36 is formed by sticking to the surface of the base 36, the first electrode 37, and the second electrode 38.

In the normal state, the protective coating 39 covers and protects the first electrode 37 and the second electrode 38, and reacts with the electrolytic solution by adhering the electrolytic solution leaking from the lead storage battery 12, The first electrode 37 and the second electrode 38 are brought into conduction.
As the protective coating 39 that reacts and dissolves with the electrolytic solution, an electrical insulating material containing a polymer compound having a basic functional group is suitable.

The strip-shaped detection sensors 31a and 31b configured as described above are attached to the receiving parts 30a and 30b of the shelf frame 30 with the longitudinal direction thereof being horizontal as shown in FIG. Even if the liquid leaks, it can be reliably detected.
In addition, the strip-shaped detection sensors 31a and 31b have the common electrode portions 37a and 38a and the parallel electrode portions 37c and 38c, which are main electrodes, extending in the length direction of the base 36. The electrolyte flows in a direction perpendicular to these electrode portions.
As a result, a belt-like detection sensor with high detection accuracy is obtained.

FIG. 3 is a view showing another detection sensor 41 constituting the belt-like detection sensors 31a and 31b.
The detection sensor 41 has the same configuration as the above-described band-shaped detection sensor 31a except that the electrode pattern is changed.

  In this detection sensor 41, the first electrode 42 includes a common electrode portion 42a formed in the length direction of the base 44, and a relay electrode portion 42b extending from the common electrode portion 42a in the base width direction. In addition, a comb-shaped electrode is formed from the parallel electrode portion 42c extending in parallel with the common electrode portion 42a from the relay electrode portion 42b.

Similarly, the second electrode 43 is also a comb-shaped electrode, and is formed of a common electrode portion 43a, a relay electrode portion 43b, and a parallel electrode portion 43c extending between the parallel electrode portions of the first electrode 42.
A connector 45 is connected to the power supply terminal 42 d of the first electrode 42 and the power supply terminal 43 d of the second electrode 43, and power is supplied to the first electrode 42 and the second electrode 43.

In this detection sensor 41, since the leaked electrolyte flows across the common electrode portions 42a and 43a and the parallel electrode portions 42c and 43c, which are the main electrode portions, the detection sensor 41 with high detection accuracy Become.
However, since the detection function is lost if it is cut in the middle, it is necessary to set the length to match the distance of the arrangement part.

4 and 5 show another embodiment in which the arrangement position of the belt-like detection sensor is changed.
The embodiment of FIG. 4 is a case where the lead storage battery 12 stored in the shelf frame 30 has the front side with the electrode terminals facing upward, and the lead storage battery 12 stored in this way is illustrated. Thus, it can attach so that the strip | belt-shaped detection sensor-50 may be wound around the side surface part of each lead acid battery 12. FIG.

Further, in the case where there is a space in the cradle part 30a on the front side of the lead storage battery 12 housed in the shelf frame 30, as shown in FIG. 5, a strip-like shape is formed on the surface of the cradle part 30a. It is preferable to install the detection sensor 51 in a horizontally long shape.
4 and the belt-like detection sensor 51 shown in FIG. 5 are the same as the belt-like detection sensors 31a and 41 shown in FIG. 2 and FIG.

Next, an embodiment in which the present invention is actually implemented will be described with reference to FIGS.
FIG. 6 shows a battery unit portion provided in the uninterruptible power supply.
In this battery unit portion, the shelf frame 60 has four stages of receiving portions 60a to 60d, and the lead storage batteries 12 are housed in the respective receiving portions so as to face forward, and each lead storage battery 12 is stored. Are connected in series by a connecting member 61.

And the strip | belt-shaped detection sensors -62a, 62b, 62c, 62d are attached to the front surface of each receiving part 60a-60d.
As shown in FIG. 7, the belt-like detection sensors-62 a to 62 d have the same configuration as the belt-like detection sensor-31 a shown in FIG. 2.
FIG. 7 shows only the belt-like detection sensor -62a.
Specifically, a band-shaped detection sensor having a length of 1.200 mm is manufactured, and is cut and attached in accordance with the horizontally long dimension of the cradle part.
In addition, the strip | belt-shaped detection sensor can manufacture the thing of the length of 1.700mm-1.800mm now.

  Further, as shown in the partial views of FIGS. 8 and 9, the belt-like detection sensor 62a shown in FIG. 7 has a belt-like polyester film as a base 63, and a copper foil plate is bonded to the surface with an adhesive. Thereafter, the first electrode 64 and the second electrode 65 similar to the first electrode 37 and the second electrode 38 shown in FIG. 2 are formed by etching.

  Further, the protective film 66 for covering the electrode is formed as a film coated with the electrical insulating material as described above.

In addition, an adhesive 67 is provided on the back surface of the base 63, and a cover tape 68 that can be peeled off is provided on the adhesive 67.
And the connector 69 with a pin is fixed to the power supply terminals 64a and 65a by soldering to the strip | belt-shaped detection sensor-62a.

  The band-shaped detection sensors 62a to 62d configured as described above are attached by peeling the cover tape 68 and attaching the back surface of the base 63 to each of the receiving parts 60a to 60d. As shown in FIG. 10, a pin receiving connector 71 having a lead wire 70 is connected.

Then, as shown in FIG. 6, the lead wire 70 of the pin receiving connector 71 connected to the pin-attached connector 69 of each of the belt-like detection sensors 62 a to 62 d is connected to the trunk line 73 by the repeater 72.
In other words, each of the belt-like detection sensors -62a to 62d is connected to the trunk line 73 in parallel.

  The trunk line 73 is connected to a monitoring unit 74 configured in the same manner as the monitoring unit 32 of the liquid leakage detection apparatus already described.

  In the present embodiment, each of the belt-shaped detection sensors -62a to 62d is supplied with power by the power supply circuit of the monitoring unit 74, and a constant voltage is applied between the first electrode 64 and the second power supply 65 in a normal state. Yes.

When liquid leakage occurs in any of the lead storage batteries 12, the electrolyte flows downward, and thus adheres to the belt-shaped detection sensor.
As a result, since the protective film 66 of the strip-shaped detection sensor to which the electrolytic solution has adhered reacts, the insulation resistance between the first electrode 64 and the second electrode 65 decreases, and a current flows between these electrodes. .

The detection circuit of the monitoring unit 74 detects the current flowing as described above, converts the current into a voltage, detects that liquid leakage has occurred, and activates the alarm.
In this embodiment, if pulse power is supplied to the belt-like detection sensors -62a to 62d, tracking that may occur between the first electrode 64 and the second electrode 65 can be prevented.

As described above, the strip-shaped detection sensor of the present invention is preferably prepared as a printed circuit board band having electrodes formed thereon, more preferably a flexible printed circuit board band.
Moreover, it can also be set as a flame-retardant printed circuit board belt | band | zone by the location to use.

As mentioned above, although the liquid leak detection sensor of the lead acid battery and the liquid leak detection apparatus were demonstrated as one Embodiment of this invention, it is the same also as the liquid leak detection sensor of the acidic liquid tank with which the chemical factory is equipped, and its detection apparatus. Can be implemented.
When implemented in this way, the belt-like detection sensor can be provided so as to be wound around the outer periphery of the tank.
In addition, the present invention can be implemented as a liquid leakage detection sensor for a storage battery mounted on an automobile and its detection device.

  Liquid leakage detection sensor for lead-acid batteries, liquid leakage detection sensor for acidic liquid tanks installed in chemical factories, and other liquid leakage detection sensors for containers containing acidic liquid and the above detection sensors It can be used as a leak detection device.

It is a simplified diagram showing an embodiment of the strip-shaped detection sensor and the liquid leakage detection device of the present invention equipped in the battery unit of the uninterruptible power supply. 2A is a partially cutaway enlarged front view of the belt-like detection sensor described above, and FIG. 2B is a cross-sectional view taken along the line AA in FIG. 2A. It is a figure which shows the other strip | belt-shaped detection sensor which changed the electrode pattern of the above-mentioned strip | belt-shaped detection sensor. FIG. 2 is a simplified view similar to FIG. 1 in which a belt-like detection sensor is arranged to be wound around each lead storage battery. It is explanatory drawing which shows an example which changed the arrangement | positioning position of a strip | belt-shaped detection sensor. It is a figure which shows the battery unit part of the uninterruptible power supply shown as one Example of this invention. It is a partially notched front view which shows the Example of the strip | belt-shaped detection sensor with which the said battery unit part was equipped. FIG. 8 is an enlarged partial view of the belt-like detection sensor shown in FIG. 7. FIG. 9 is a sectional view taken along line BB in FIG. It is the elements on larger scale of the battery unit part shown in FIG. It is a block diagram which shows the circuit example of an uninterruptible power supply. It is a circuit block diagram which shows the prior art example of the uninterruptible power supply device provided with the liquid leak detection apparatus. It is a partially notched front view which shows the detection sensor with which the conventional liquid leak detection apparatus is equipped.

Explanation of symbols

12 Lead storage battery 30 Shelf frame 30a, 30b Receiving part 31a, 31b Band-shaped detection sensor
32 Monitoring section 33 Power supply circuit 34 Detection circuit 35 Alarm 36 Base 37 First electrode 37a Common electrode section 37b Relay electrode section 37c Parallel electrode section 37d Feed terminal 38 Second electrode 38a Common electrode section 38b Relay electrode section 38c Parallel electrode Part 38d feeding terminal 39 protective coating

Claims (5)

In the detection sensor for detecting acidic liquid leaking from the contents,
A base made of an electrically insulating strip-like thin plate;
An electrode provided on one surface of the base, the common electrode portion being elongated along one side of the base width along the length direction of the base, and a predetermined interval from the common electrode portion to form a base width A first electrode comprising a plurality of relay electrode portions extending in a direction and parallel electrode portions extending in parallel to the common electrode portion from each of the relay electrode portions;
An electrode provided on one surface of the base, the common electrode portion being elongated along the length direction of the base toward the other side of the base width, and another base width provided at a predetermined interval from the common electrode portion. A plurality of relay electrode portions formed in the middle of each of the relay electrode portions of the first electrode, and extending from each relay electrode portion in parallel to the common electrode portion, A second electrode comprising a parallel electrode portion in contact with the parallel electrode portion;
A protective coating made of an acidic liquid-permeable electrical insulating material provided on one surface of the base including the first and second electrodes;
A strip-shaped detection sensor, wherein the leaked acidic liquid is arranged to flow in the width direction of the base. In strip detection sensors attached to the mounting serial to claim 1,
A flexible insulating sheet, such as a plastic film as a base, first on one side thereof, the second electrode is formed, these first, a protective coating made of an electrically insulation material in which the one surface of the base including the second electrode A strip-shaped detection sensor provided to cover the first and second electrodes. In the belt-shaped detection sensor according to claim 1 or 2 ,
The band-shaped detection sensor, wherein the protective coating made of the acidic liquid-permeable electrical insulating material is composed of an electrical insulating material containing a polymer compound having a basic functional group. In the strip | belt-shaped detection sensor in any one of Claims 1-3 ,
A strip-shaped detection sensor, wherein a plurality of sets of electrodes, each of which includes the first and second electrodes, are provided on one base surface. In the liquid leak detection device that detects the electrolyte leaking from the storage battery,
A base made of an electrically insulating strip-like thin plate;
An electrode provided on one surface of the base, the common electrode portion being elongated along one side of the base width along the length direction of the base, and a predetermined interval from the common electrode portion to form a base width A first electrode comprising a plurality of relay electrode portions extending in a direction and parallel electrode portions extending in parallel to the common electrode portion from each of the relay electrode portions;
An electrode provided on one surface of the base, the common electrode portion being elongated along the length direction of the base toward the other side of the base width, and another base width provided at a predetermined interval from the common electrode portion. A plurality of relay electrode portions formed in the middle of each of the relay electrode portions of the first electrode, and extending from each relay electrode portion in parallel to the common electrode portion, A second electrode comprising a parallel electrode portion in contact with the parallel electrode portion;
A belt-shaped detection sensor comprising a protective coating made of an acidic liquid-permeable electrical insulating material provided on one surface of the base including the first and second electrodes;
And a power feeding means for feeding power to the first and second electrodes,
Detecting means that performs detection in response to a resistance change of the belt-shaped detection sensor;
Alarm means responsive to the detection operation of the detection means,
The strip-shaped detection sensor is disposed so that the longitudinal direction is orthogonal to the flow path of the electrolyte solution leaking from the storage battery,
A liquid leakage detection apparatus characterized in that the detection means detects a change in resistance of the belt-shaped detection sensor caused by the leaked electrolyte solution adhering to the belt-shaped detection sensor, and the alarm means is operated as an alarm.

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