JP2007249299A - Carbon monoxide alarm and suspension tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a CO alarm unit for announcing the deterioration (reduction of water) of a CO sensor, without using special circuits or suspension tools for suspending a CO alarm unit from a mounting wall. <P>SOLUTION: This CO alarm unit 100 is provided with a CO sensor 1 which detects CO concentration by using water and a case body 22 in which the CO sensor 1 is housed. A hooking tab 23 is hooked to a hook part 30 mounted on a mounting wall, so that the case body 22 can be suspended. The case body 22 is suspended so as to be rockable with the hooking tab 23 as a center. Also, the CO sensor 1 is housed in the case body 22 so that a center of gravity G1 of the CO sensor 1 can be positioned farther on the right side in the horizontal direction Y of the hooking tab 23, in a state where the case body 22 is suspended, and components, excluding the CO sensor 1, are housed in the case body so that the center of gravity G2 obtained by combining the center of gravity of the case body 22 with the center of gravity of the components as a whole, excluding the CO sensor 1 among the components housed in the case body 22 can be positioned farther on the left side in the horizontal direction Y1 of the hooking tab 23, in a state where the case body 22 is suspended. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a carbon monoxide alarm and a hanger, and in particular, a water container for containing water, and a short circuit corresponding to the carbon monoxide concentration by a reaction between water vapor and carbon monoxide from the water container. A carbon monoxide sensor having a pair of electrodes through which a current flows, and a housing for housing the carbon monoxide sensor, and detecting leakage of carbon monoxide based on a short-circuit current of the pair of electrodes; The present invention relates to a carbon monoxide alarm and a hanging tool for suspending the carbon monoxide alarm on a mounting wall.

  Conventionally, the above-described carbon monoxide (hereinafter referred to as CO) alarm device includes a water container for containing water and a pair of electrodes through which a short-circuit current corresponding to the CO concentration flows due to the reaction between water vapor and CO from the water container. And a housing for housing the CO sensor, which detects a leak of carbon monoxide based on a short-circuit current of a pair of electrodes and warns that effect. ing.

  As the above-mentioned CO sensor, for example, proton conductor gas sensors shown in FIGS. 6 and 7 are known (Patent Documents 1 and 2). In the figure, reference numeral 1 is a CO sensor composed of a proton conductor gas sensor. The CO sensor 1 includes a metal can 2 as a water container and a membrane / electrode assembly (hereinafter referred to as MEA) 3. The metal can 2 is provided with a constricted portion 4 in the middle. Water 5 is accommodated below the constricted portion 4. The water 5 may be stored as liquid water as shown in the figure, or may be gelled or may be stored by wrapping the gelled water in a film.

  As shown in FIG. 7, the MEA 3 described above includes a proton conductor film 31 and a detection electrode 32 a and a counter electrode 32 b as a pair of electrodes provided on both surfaces of the proton conductor film 31. The proton conductor film 31 is a film in which protons (protons) conduct and electrons do not conduct. The MEA 3 is mounted on a metal washer 6 provided on the upper side of the constriction 4 so that the counter electrode 32 b faces the metal washer 6. The metal washer 6 is provided with a water vapor introduction hole 6 a for supplying water vapor from the water 5 accommodated below the constriction 4 to the MEA 3.

  A metallic diffusion control plate 7 and a sealing body 8 are mounted on the upper side of the MEA 3. The sealing body 8 removes poisonous substances and gas causing false alarms and prevents them from being supplied to the MEA 3. The sealing body 8 includes a metal cap 8a, a metal bottom plate 8b, and a filter material 8c made of activated carbon, silica gel, zeolite or the like for gas adsorption filled between the cap 8a and the bottom plate 8b. . The cap 8a is provided with an introduction hole 8a1 for introducing an atmosphere into the filter material 8c. The bottom plate 8b is provided with a lead-out hole 8c1 for leading the atmosphere from the filter material 8c to the diffusion control plate 7.

  The diffusion control plate 7 is provided with a diffusion control hole 7a. Reference numeral 9 denotes a gasket, which is provided between the sealing body 8 and the inner surface of the metal can 2 and caulked the metal can 2 to form the caulking portion 2a, thereby moving the sealing body 8 toward the metal washer 6 side. The gap between the members is eliminated by the pressure, and electrical connection from the detection electrode 32a to the cap 8a through the diffusion control plate 7 and the bottom plate 8b is secured. That is, the cap 8a is a terminal of the detection electrode 32a. Similarly, the electrical connection from the counter electrode 32b to the metal can 2 through the metal washer 6 is ensured. That is, the metal can 2 is a terminal of the counter electrode 32b.

Moreover, as shown in FIG. 7, the detection electrode 32a and the counter electrode 32b are short-circuited. The ambient atmosphere that has passed through the sealing body 8 reaches the detection electrode 32a of the MEA 3 from the diffusion control hole 7a. The CO in the atmosphere reaching the detection electrode 32a reacts with water to generate protons as shown in the following formula (1).
CO + H ₂ O → CO ₂ + 2H ⁺ (proton) + 2e ⁻ (1)

Water necessary for the above formula (1) is supplied as water vapor from the water vapor introduction hole 6a. H ⁺ (proton) generated by the reaction of the formula (1) reaches the counter electrode 32 b through the proton conductor film 31. Further, e ⁻ (electrons) generated by the reaction of the formula (1) reaches the counter electrode 32b through a short circuit path between the detection electrode 32a and the counter electrode 32b. The H ⁺ (protons) and e ⁻ (electrons) reaching the counter electrode 32b react with oxygen in the atmosphere to generate water as shown in the following formula (2).
2H ⁺ + 1 / 2O ₂ + 2e ⁻ → H ₂ O (2)

The amount of e ⁻ passing through the short circuit path is proportional to the CO concentration in the atmosphere. That is, the short circuit current Is of the detection electrode 32a and the counter electrode 32b is a value corresponding to the CO concentration in the atmosphere. Therefore, the CO sensor 1 includes a detection circuit 10 as shown in FIG. The detection circuit 10 is provided on the short-circuit path of the detection electrode 32a and the counter electrode 32b, and converts the short-circuit current Is into a voltage signal Vo, and a voltage signal from the current / voltage conversion amplification circuit 11 A CPU 12 that detects CO leakage based on Vo and a buzzer 13 that generates an alarm sound that tells the CO leakage are provided.
JP 2004-170101 A JP 2004-279293 A

  The above-described CO sensor 1 uses the water 5 to detect the CO concentration. For this reason, when the water 5 decreases due to evaporation or the like, there is a problem that the water 5 cannot be sufficiently supplied to the detection electrode 32a and the CO concentration cannot be detected accurately.

Therefore, the CO sensor 1 is considered as a kind of capacitor and charged through a resistor, and then a discharge curve is detected. Focusing on the fact that the discharge curve is different from the normal time indicated by the solid line in FIG. 8 and the deterioration time indicated by the dotted line (reduction of water 5), the presence or absence of deterioration (reduction of water 5) is detected from the difference from the discharge curve. A method is considered. As a self-diagnosis circuit for realizing this method, a circuit as shown in FIG. 9 is known. As shown in the figure, the current / voltage conversion amplifier circuit 11 includes an amplifier IC1, an amplifier IC3, a resistor Rf, a resistor R1, and a resistor R2. A divided voltage obtained by dividing the constant voltage V by the resistors R3 and R4 is applied to the metal can 2 of the CO sensor 1, that is, the counter electrode 32b, as the base voltage Vb via the amplifier IC4. Therefore, the relationship between the short circuit current Is and the voltage signal Vo is as shown in the following equation (2).
Vo = Vb− (1 + R2 / R1) × Rf × Is (2)

  The self-diagnosis circuit is provided between the above-described CO sensor 1 and the current / voltage conversion amplifier circuit 11 and includes a switch circuit IC2 that separates the CO sensor 1 from the current / voltage conversion amplifier circuit 11. The switch circuit IC2 is controlled to be turned on / off by the CPU 12. In addition, the self-diagnosis circuit includes a charging circuit 14 that charges the CO sensor 1. The charging circuit 14 includes a charging resistor Rc and a switching transistor Tr1 for connecting the CO sensor 1 to the constant voltage V.

  The operation of the self-diagnosis circuit configured as described above will be described below. First, the CPU 12 turns off the switch circuit IC2 to disconnect the CO sensor 1 from the current / voltage conversion amplifier circuit 11. Next, when the CPU 12 turns on the transistor Tr1, the CO sensor 1 is charged by the constant voltage V through the charging resistor Rc. Thereafter, the CPU 12 turns off the transistor Tr1 to stop charging, and then turns on the switch circuit IC2 again to connect the CO sensor 1 and the current / voltage conversion amplifier circuit 11. As a result, the CO sensor 1 is discharged through the resistor Rf. As shown in FIG. 8, it is determined that the voltage signal Vo after the start of the discharge and the voltage signal Vo after the lapse of the predetermined time t1 is within a predetermined normal range is normal, and when it is not within the normal range, it is determined to be deteriorated. When the CPU 12 determines that the deterioration has occurred, the CPU 12 notifies the fact using display means (not shown).

  However, according to the conventional self-diagnosis circuit, the charging circuit 14 for charging the CO sensor 1 and the switch circuit IC2 for separating the CO sensor 1 from the current / voltage conversion amplifier circuit 11 are required, which causes a problem in cost. It was.

  Therefore, the present invention pays attention to the above-mentioned problems, and a CO alarm device and a CO alarm device capable of notifying the deterioration (reduction of water) of the CO sensor without using a special circuit are attached to the mounting wall. It is an object to provide a hanging tool for hanging.

  The invention according to claim 1, which has been made in order to solve the above-described problems, includes a water container for containing water, and a short-circuit current corresponding to the carbon monoxide concentration by a reaction between water vapor and carbon monoxide from the water container. A carbon monoxide sensor having a pair of electrodes through which the carbon monoxide flows, and a housing for housing the carbon monoxide sensor, and detecting leakage of carbon monoxide based on a short-circuit current of the pair of electrodes. In the carbon monoxide alarm that is configured to alarm, the casing has a hooked portion that is hooked on a hook portion provided on a mounting wall thereof, and can swing around the hooked portion. The center of gravity of the carbon monoxide sensor is positioned on one side in the horizontal direction with respect to the hooked portion in a state where the hook is hooked on the hook portion and the casing is suspended. A carbon monoxide sensor is inside the housing. In the state where the hooked portion is hooked on the hook portion and the housing is suspended, the center of gravity of the housing and the carbon monoxide sensor among the components accommodated in the housing are disposed. The parts excluding the carbon monoxide sensor are housed in the housing so that the center of gravity, which is the sum of the center of gravity of all parts removed, is located on the other side in the horizontal direction than the hooked portion. It exists in the carbon monoxide alarm.

  According to the first aspect of the present invention, the casing is suspended so as to be swingable around the hooked portion. In addition, the carbon monoxide sensor is housed in the housing such that the center of gravity of the carbon monoxide sensor is positioned on one side in the horizontal direction with respect to the hooked portion in a state where the housing is suspended. In the state where the housing is suspended, the center of gravity of the housing and the center of the entire component excluding the carbon monoxide sensor out of the components housed in the housing is the other side in the horizontal direction from the hooked part. The parts excluding the carbon monoxide sensor are accommodated in the housing so as to be located in the housing. According to the above configuration, the mass of the carbon monoxide sensor decreases when the amount of water stored in the water container in the carbon monoxide sensor decreases. As the mass of the carbon monoxide sensor decreases, the center of gravity of the housing and the center of gravity of the entire component excluding the carbon monoxide sensor out of the components housed in the housing move downward in the vertical direction. Then, the casing swings around the hooked portion so that the center of gravity of the carbon monoxide sensor moves vertically upward, and the casing tilts. The deterioration can be notified by the inclination of the housing.

  The invention according to claim 2 further includes an electric circuit housed in the housing, and a battery housed in the housing and supplying power to the electric circuit, and the center of gravity of the battery has the cover. The carbon monoxide alarm device is characterized in that the battery is housed in the housing so as to be positioned on the other side in the horizontal direction from the hooking portion.

  According to the second aspect of the present invention, the battery pack further includes an electric circuit housed in the housing, a battery housed in the housing and supplying power to the electric circuit, and the center of gravity of the battery is hooked. The housing is accommodated so as to be positioned on the other side in the horizontal direction with respect to the portion. Accordingly, by positioning the center of gravity of a battery having a relatively heavy mass among the electrical components housed in the housing on the other side in the horizontal direction with respect to the hooked portion, the housing does not have to be housed separately in the housing. The center of gravity, which is the sum of the center of gravity of the body and the center of gravity of the entire part excluding the carbon monoxide sensor among the parts housed in the housing, can be positioned on the other side in the horizontal direction with respect to the hooked portion.

  The invention described in claim 3 is a hanging tool for suspending the housing of the carbon monoxide alarm according to claim 1 or 2 on its mounting wall, and a plate-like base portion mounted on the mounting wall; A deterioration scale indicating a position of the casing on the front of the base when the water in the water container is reduced to a predetermined amount on the front of the base. There exists in the hanging tool characterized by being provided.

  According to the invention of claim 3, a deterioration scale indicating the position of the housing on the front of the base when the water in the water container is reduced to a predetermined amount is provided on the front of the plate-like base attached to the mounting wall. Yes. Therefore, the user can recognize that the deterioration scale is deteriorated at a glance by comparing the deterioration scale with the position of the housing on the base.

  The invention according to claim 4 is characterized in that a normal scale indicating the position of the housing on the front of the base when the water in the water container is full is provided on the front of the base. The present invention resides in a hanging tool according to claim 3.

  According to invention of Claim 4, the normal scale which shows the position of the housing | casing on the said base part front when the water in a water container is full is provided in the front of the base. Therefore, the user can recognize how much the normal scale is deteriorated with respect to the normal state at a glance by comparing the normal scale and the position of the housing on the base.

  As described above, according to the first aspect of the present invention, when the water contained in the water container in the carbon monoxide sensor decreases, the mass of the carbon monoxide sensor decreases. As the mass of the carbon monoxide sensor decreases, the center of gravity of the housing and the center of gravity of the entire component excluding the carbon monoxide sensor out of the components housed in the housing move downward in the vertical direction. Then, the casing swings around the hooked portion so that the center of gravity of the carbon monoxide sensor moves vertically upward, and the casing tilts. Since the deterioration can be notified by the inclination of the housing, the deterioration (reduction in water) of the carbon monoxide sensor can be notified without using a special circuit.

  According to the second aspect of the present invention, the center of gravity of the battery having a relatively heavy mass among the electrical components housed in the casing is positioned on the other side in the horizontal direction with respect to the hooked portion, whereby the weight is separately provided in the casing. Even if it is not housed in the housing, the center of gravity, which is the sum of the center of gravity of the casing and the center of gravity of all parts except the carbon monoxide sensor among the parts housed in the casing, is positioned on the other side in the horizontal direction from the hooked part. Therefore, the deterioration (reduction in water) of the carbon monoxide sensor can be notified without adding a weight.

  According to the third aspect of the invention, the user can recognize the deterioration at a glance by comparing the deterioration scale and the position of the housing on the base, so that the carbon monoxide sensor can be more reliably connected. Deterioration can be reported.

  According to the fourth aspect of the present invention, the user can recognize how much the normal scale is deteriorated with respect to the normal state at a glance by comparing the normal scale and the position of the housing on the base, and thus more reliably. The deterioration of the carbon monoxide sensor can be notified.

  Hereinafter, the carbon monoxide (hereinafter referred to as CO) alarm device and the hanging tool of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of a plate as a CO alarm device and a hanging tool of the present invention. FIG. 2 is a front view of the CO alarm device and the plate shown in FIG. 3A to 3C are a front view, a side view, and a top view of the plate shown in FIG.

  As shown in FIG. 2, the CO alarm device 100 is equipped with a CO sensor 1 and a detection circuit 10 (see FIG. 7) as an electric circuit that detects CO leakage from the output of the CO sensor 1 and warns to that effect. And a battery 21 that supplies power to the detection circuit 10.

  The CO sensor 1 includes a metal can 2 (FIG. 6) as a water container for containing water, and a pair of electrodes through which a short-circuit current Is corresponding to the CO concentration flows due to the reaction between water vapor and CO from the metal can 2. Detection electrode 32a and counter electrode 32b (FIG. 7). Since the CO sensor 1 is equivalent to the conventional CO sensor described above with reference to FIGS. 6 and 7, detailed description thereof is omitted.

  As shown in FIG. 7, the detection circuit 10 has a current / voltage conversion amplifier circuit 11 that converts the short-circuit current Is into a voltage signal Vo, and detects CO leakage based on the voltage signal Vo from the current / voltage conversion amplifier circuit 11. It has a CPU 12 for detecting, and a buzzer 13 for generating an alarm sound that tells the CO leakage.

  The CO alarm device 100 includes a substantially box-shaped housing 22 that houses the above-described CO sensor 1, a circuit board 20 on which the detection circuit 10 is mounted, and a battery 21. As shown in FIG. 2, the front surface of the housing 22 is a line object with the symmetry line L1 as an axis. As shown in FIGS. 1 and 2, the housing 22 has a hooking tab 23 as a hooked portion that is hooked on a hook portion 30 provided on the mounting wall. The hook tab 23 is provided so as to protrude from the rear side end portion of the top surface 22 a on the vertical upper side of the housing 22. The hook tab 23 is provided in the center of the top surface 22a in the horizontal direction Y1.

  The hook tab 23 is provided with a hook hole 23a. When the hook portion 30 provided on the attachment wall is inserted into the hook hole 23a and the hook tab 23 is hooked on the hook portion 30, the housing 22 can be suspended and attached to the attachment wall. The housing 22 of the CO alarm device 100 is suspended so as to be swingable around the hooking tab 23 and the hook part 30 in a state where the hooking tab 23 is hooked on the hook part 30 and suspended.

  Next, the accommodation positions of the CO sensor 1, the circuit board 20, and the battery 21 accommodated in the housing 22 will be described with reference to FIG. 2. In the present embodiment, the CO sensor 1 and the circuit board are arranged so that the center of gravity O of the entire CO alarm device 100 is positioned on the symmetry line L1 when the water 5 contained in the metal can 2 in the CO sensor 1 is full. 20 and a battery 21 are accommodated in a housing 22. Thus, as shown in FIG. 2, when the water 5 contained in the metal can 2 is full, the casing is in a state where the symmetry line L1 and the straight line L2 passing through the hooking tab 23 and parallel to the vertical direction coincide with each other. 22 is suspended.

  Further, the CO sensor 1 is disposed in the housing 22 on the right side in the horizontal direction Y1 on the vertical upper side. That is, in a state where the hooking tab 23 is hooked on the hook portion 30 and the housing 22 is suspended, the CO sensor 1 is placed in the housing such that the center of gravity G1 of the CO sensor 1 is located on the right side Y1 in the horizontal direction from the hooking tab 23. 22 is accommodated.

  In addition, the circuit board 20 is disposed in the center on the vertical upper side of the housing 22, for example. Accordingly, the center of gravity G21 of the circuit board 20 is positioned on the straight line L2 in a state where the hooking tab 23 is hooked on the hook portion 30 and the housing 22 is suspended.

  Further, the battery 21 is disposed on the left side in the horizontal direction Y1 on the vertical lower side of the housing 22. That is, in the state where the hooking tab 23 is hooked on the hook portion 30 and the housing 22 is suspended, the battery 21 is placed in the housing 22 so that the center of gravity G22 of the battery 21 is located on the left side of the hooking tab 23 in the horizontal direction Y1. Is housed in. The housing 22 is provided so that the center of gravity of the housing 22 itself coincides with the center of gravity O, for example.

  The mass of the battery 21 is heavier than the mass of the circuit board 20 and the housing 22. For this reason, the center G2 of the center of gravity of the casing 22, the center of gravity G21 of the circuit board 20, and the center of gravity G22 of the battery 21 is located near the center of gravity G22 of the battery 21. That is, the above-described center of gravity G2 is located on the left side in the horizontal direction Y1 with respect to the hooking tab 23. The circuit board 20 and the battery 21 correspond to components excluding the CO sensor 1 among components housed in the housing 22. In other words, the center of gravity G2, which is the sum of the center of gravity of the housing 22 and the center of gravity of the entire components excluding the CO sensor 1 among the components housed in the housing 22, is positioned to the left of the hooking tab 23 in the horizontal direction Y1. In addition, of the components housed in the housing 22, the components excluding the CO sensor 1 are housed in the housing 22.

  Note that the center of gravity of the whole part mentioned above means the combined center of gravity when the parts are combined, and the center of gravity of the one part when there is only one part. Yes. In addition, being positioned on the right side in the horizontal direction Y1 with respect to the hooking tab 23 means in detail that it is positioned on the right side with respect to the straight line L2 passing through the hooking tab 23 along the vertical direction. It is located on the left side of the straight line L2 passing through the hooking tab 23 and extending in the vertical direction.

  Next, the movement of the housing 22 when the water 5 in the CO sensor 1 decreases will be described with reference to FIGS. 4 and 5. FIG. 4 is a diagram showing the positions of the centroids G1 and G2 in a coordinate system in which the hooking tab 23 is the origin, the horizontal direction passing through the hooking tab 23 is the x axis, and the vertical direction passing through the hooking tab 23 is the y axis. The mass of the CO sensor 1 when the water 5 is fully filled is m1, and the coordinates of the center of gravity G1 at this time are (x1, y1).

  Further, as described above, the total mass of the housing 22 and the components housed in the housing 22 excluding the CO sensor 1 centered on the battery 21 is m2 (this mass change is the CO sensor 1 It is almost unchanged compared to the mass change.), The coordinates of the center of gravity G2 when the water 5 is fully filled are (x2, y2). When the water 5 is fully filled, the center of gravity G1 and the center of gravity G2 are balanced by the relationship of m1 · x1 = m2 · x2. At this time, the housing 22 is suspended as shown by a one-dot chain line in FIG. The housing 22 is suspended in a state where the symmetry line L1 and the straight line L2 passing through the hooking tab 23 along the vertical direction coincide.

  The water 5 is reduced and the mass of the CO sensor 1 is reduced to m1 ′. As the mass of the CO sensor 1 decreases, the coordinates of the center of gravity G2 move from (x2, y2) to (x2 ', y2'), and the coordinates of the center of gravity G1 of the CO sensor 1 change from (x1, y1) to (x1 ' , Y1 ′). The center of gravity G1 and the center of gravity G2 are balanced by the relationship of m1 ′ · x1 ′ = m2 · x2 ′. That is, the housing 22 swings (rotates) at an angle θ about the hooking tab 23 so that the center of gravity G2 moves vertically downward and the center of gravity G1 of the CO sensor 1 moves vertically upward. . As a result, the casing 22 is tilted toward the center of gravity G2, and the centers of gravity G1 and G2 are balanced in a state where the symmetry line L1 of the casing 22 is tilted at an angle θ with respect to the straight line L2, as indicated by a two-dot chain line in FIG. Deterioration can be notified by the inclination of the housing 22, and deterioration (reduction in water) of the CO sensor 1 can be notified without using a special circuit.

The relationship between the inclination θ of the housing 22 and x1 ′ and x2 ′ can be expressed by the following equations (1) and (2).
x1 ′ = √ (x1 ² + y1 ² ) × COS (θ1−θ) (1)
x2 ′ = √ (x2 ² + y2 ² ) × COS (θ2 + θ) (2)

  Further, according to the CO alarm device 100 described above, the center of gravity G22 of the battery 21 is accommodated in the housing 22 so as to be positioned on the left side in the horizontal direction Y1 with respect to the hooking tab 23. Accordingly, by positioning the center of gravity G22 of the battery 21 having a relatively heavy mass among the components housed in the housing 22 on the right side in the horizontal direction Y1 with respect to the hooking tab 23, a weight is not added to the housing 22 separately. Even so, the center of gravity G2, which is the sum of the center of gravity of the casing 22 and the center of gravity of the entire part excluding one CO sensor 1 among the parts accommodated in the casing 22, is positioned to the left of the hooking tab 23 in the horizontal direction Y1. be able to. Therefore, it is possible to notify the deterioration (reduction in water) of the CO sensor 1 without adding special parts such as weights.

  Next, the plate 200 for suspending the above-described CO alarm device 100 will be described. As shown in FIGS. 1 to 3, the plate 200 as a hanging tool includes a plate-like base portion 40 attached to the attachment wall of the housing 22 and a hook portion 30 provided in front of the base portion 40. . The hook portion 30 of the plate 200 is formed by extruding a part of one plate-like base portion 40 from the back side to the front side.

  Further, a deterioration scale 51 indicating the position of the housing 22 on the base 40 when the water 5 in the metal can 2 is reduced from full to a predetermined amount is provided on the front surface of the base 40 of the plate 200. Further, a normal scale 52 indicating the position of the housing 22 on the base 40 when the water 5 in the metal can 2 is full is provided on the front surface of the base 40 of the plate 200. The predetermined amount is smaller than the amount of water 5 when full. When the water 5 decreases below a predetermined amount, the CO sensor 1 is deteriorated and the CO concentration cannot be detected accurately.

  In the present embodiment, the deterioration scale 51 and the normal scale 52 are provided along the outer shape line L3 (FIG. 2) on the top surface 22a side of the front surface of the housing 22 when viewed from the front. Thereby, the user can recognize that it has deteriorated at a glance by comparing the position (= position of the housing | casing 22) of the degradation scale 51 and the outline line L3 on the base 40. FIG. Further, the user can recognize how much the normal scale 52 is deteriorated with respect to the normal state at a glance by comparing the normal scale 52 with the position of the outer shape line L3 on the base 40 (= the position of the housing 22). For this reason, deterioration of the CO sensor 1 can be notified more reliably.

  In the above-described embodiment, the battery 21 is housed in the housing 22 so that the center of gravity of the battery 21 is positioned on the left side in the horizontal direction Y1 with respect to the hooking tab 23. However, the present invention is not limited to this. . For example, when the battery 21 cannot be arranged to the left of the hooking tab 23 in the horizontal direction Y1, or when power is supplied from an outlet and the battery 21 is not accommodated, a weight made of lead or the like is placed in the housing 22. The weight is housed in the housing 22 so that the center of gravity of the weight is positioned on the left side in the horizontal direction Y1 with respect to the hook tab 23. As a result, the center of gravity G2 that combines the center of gravity of the housing 22 and the center of gravity of the entire component excluding the CO sensor 1 centered on the weight among the components housed in the housing 22 is more than the hook tab 23. It may be located on the left side in the horizontal direction Y1.

  In short, the CO sensor 1 is in a housing so that the center of gravity G1 of the CO sensor 1 is positioned on one side in the horizontal direction Y1 with respect to the hook tab 23 in a state where the hook 22 is hooked on the hook portion 30 and the housing 22 is suspended. The center of gravity G2 that combines the center of gravity of the housing 22 and the center of gravity of the entire component excluding the CO sensor 1 among the components housed in the housing 22 is the other in the horizontal direction Y1 than the hooking tab 23. Of the components housed in the housing 22 so as to be positioned on the side, the components other than the CO sensor 1 may be housed in the housing 22.

  In the above-described embodiment, the deterioration scale 51 and the normal scale 52 are provided along the outer shape line L3 of the housing 22, but the present invention is not limited to this. For example, you may provide along the whole front side external shape of the housing | casing 22. FIG. In addition, a mark is provided on the front edge and side of the housing 22, a deterioration scale 51 is provided at the mark position on the front of the base 40 when the water 5 is reduced to a predetermined amount, and the base 40 when the water 5 is full. You may provide the normal scale 52 in the position of the mark on the front.

  In the above-described embodiment, the hook tab 23 as the hooked portion is provided on the top surface 22a of the housing 22, but the present invention is not limited to this. For example, a hooking hole 23a may be provided on the back surface of the housing 22, and the back surface may be used as the hooked portion. Further, the shape of the housing 22 is not limited to a box shape.

  Further, the above-described embodiments are merely representative forms of the present invention, and the present invention is not limited to the embodiments. That is, various modifications can be made without departing from the scope of the present invention.

It is a perspective view which shows one Embodiment of the plate as a CO alarm device and hanging tool of this invention. It is a front view of the CO alarm device and plate shown in FIG. (A)-(c) is the front view, side view, and top view of a plate which are respectively shown in FIG. It is a figure which shows the position of the gravity center G1 and the gravity center G2 in xy coordinates. FIG. 6 is a front view when the CO sensor is deteriorated and the housing 22 is tilted about the hook tab 23. It is sectional drawing which shows an example of the conventional CO sensor. It is sectional drawing of MEA which comprises the conventional CO sensor, and a circuit diagram which shows the detection circuit using CO sensor. It is a time chart which shows the discharge curve of a CO sensor. It is a circuit diagram which shows the structure of the conventional self-diagnosis circuit.

Explanation of symbols

1 CO sensor 2 Metal can (water container)
10 Detection circuit (Electric circuit)
21 Battery 22 Case 23 Hook Tab (Hook Part)
30 hook part 40 base part 32a detection electrode (a pair of electrodes)
32b Counter electrode (a pair of electrodes)
51 Degradation scale 52 Normal scale 100 CO alarm 200 Plate (Hanging tool)
Is Short-circuit current G1 Center of gravity G2 Center of gravity Y1 Horizontal direction

Claims (4)

A water container for containing water, a carbon monoxide sensor having a pair of electrodes through which a short-circuit current corresponding to the carbon monoxide concentration flows by a reaction between water vapor and carbon monoxide from the water container, and the carbon monoxide A carbon monoxide alarm that includes a housing that houses the sensor, detects leakage of carbon monoxide based on the short-circuit current of the pair of electrodes, and warns that effect,
The housing has a hooked portion that is hooked on a hook portion provided on the mounting wall, and is suspended so as to be swingable around the hooked portion,
The carbon monoxide sensor so that the center of gravity of the carbon monoxide sensor is located on one side in the horizontal direction of the hooked portion in a state where the hooked portion is hooked on the hook portion and the housing is suspended. Is housed in the housing,
Then, in a state where the hooked portion is hooked on the hook portion and the housing is suspended, the center of gravity of the housing and the components housed in the housing except for the carbon monoxide sensor A component other than the carbon monoxide sensor is housed in the housing so that a center of gravity that is combined with the entire center of gravity is positioned on the other side in the horizontal direction from the hooked portion. Alarm. An electrical circuit housed in the housing;
A battery that is housed in the housing and supplies power to the electrical circuit;
And the said battery is accommodated in the said housing | casing so that the gravity center of the said battery may be located in the other horizontal direction side rather than the said to-be-hooked part, The carbon monoxide alarm device characterized by the above-mentioned. A hanging tool for suspending the housing of the carbon monoxide alarm according to claim 1 or 2 on its mounting wall,
A plate-like base attached to the mounting wall;
A hook portion provided in front of the base portion,
And the degradation scale which shows the deterioration scale which shows the position of the said housing | casing on the said base part front surface when the water in the said water container reduces to the predetermined amount is provided in the front of the said base part.   The suspension according to claim 3, wherein a normal scale indicating a position of the housing on the front of the base when the water in the water container is full is provided on the front of the base. Ingredients.

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