JP5719011B2 - Gas supply adapter - Google Patents

Description

  The present invention provides a gas supply port for taking in external air, a gas discharge port for discharging air taken in from the gas supply port, and a gas flow passage connecting the gas supply port and the gas discharge port And a gas supply adapter that can be connected to a portable gas alarm having a plurality of gas sensors.

As a conventional gas supply adapter that can be connected to a portable gas alarm device, the gas flow passage is bent in order to prevent air from flowing directly from the gas supply port to the gas discharge port. Things are known.
The gas flow passage is branched from the main gas flow passage to introduce gas into each of a main gas flow passage connecting the gas supply port to the gas discharge port and a plurality of gas sensors built in the portable gas alarm. (Refer to FIG. 14 of Patent Document 1).

Japanese Patent No. 3839325

Since the gas supply adapter has a complicated structure in which the gas flow passage is bent and the main gas flow passage and the branch gas flow passage are provided, the gas supply adapter is increased in size to secure the space. In addition, since the volume of the gas flow passage is large, there remains room for improvement in the gas replacement efficiency.
Also, depending on the type of gas sensor, the gas concentration to be detected varies depending on the amount of air supplied. For this reason, it is important to obtain a stable and accurate detection result regardless of the air volume, but the above-described gas supply adapter cannot sufficiently solve such a problem.
An object of the present invention is to provide a gas supply adapter capable of reducing the size of the apparatus and improving the gas replacement efficiency, and enabling the gas sensor to detect stably and accurately regardless of the air volume. is there.

The first characteristic configuration is a gas supply port for taking in external air, a gas discharge port for discharging air taken in from the gas supply port, and a gas flow connecting the gas supply port and the gas discharge port A gas supply adapter connectable to a portable gas alarm having a plurality of gas sensors, wherein the gas flow passage includes a main flow passage and a sub flow passage, and the main flow passage includes the plurality of gas flow passages. The gas sensor has a portion that extends substantially parallel to the gas contact surface of at least one first gas sensor and forms a gas flow passage with the gas contact surface , and the subflow passage is at least other than the first gas sensor. the gas was vented to gas contact surface of one of the second gas sensor, such that the end face of the secondary flow passage faces the gas contact surface of the at least one second gas sensor, the main passage Out in that it is branched at the portion extending substantially parallel to the gas contact surface of the second gas sensor.

[Action and effect]
If the air is directly supplied to the first gas sensor as in this configuration, the structure of the gas flow passage can be simplified. As a result, it is possible not only to reduce the space of the gas flow path and reduce the size of the gas supply adapter, but also to reduce the volume of the gas flow path, thereby improving the gas replacement efficiency.
Furthermore, if the air is diffused and supplied to the second gas sensor as in this configuration, a constant amount of air can be supplied to the gas sensor regardless of the air volume of the taken-in air. Therefore, a stable and accurate detection result can be obtained.
In other words, according to this configuration, according to the type of gas sensor, the gas flow passage having the most suitable form for each gas sensor is provided, so that the apparatus can be downsized and the detection accuracy can be improved.

A second characteristic configuration is that the side flow passage has a larger cross-sectional area than the main flow passage.
The third characteristic configuration is that the side flow passage is branched from the main flow passage so as to form a space in a direction substantially perpendicular to the main flow passage.
A fourth characteristic configuration is that the sub-flow passage reduces the flow velocity of air passing through the main flow passage and supplies it to the second gas sensor.

In the fifth characteristic configuration, the main flow passage further includes a portion for supplying air substantially perpendicularly to a gas contact surface of the first gas sensor, and the portion for supplying air substantially vertically includes the first gas sensor. In this point, air is supplied to a portion adjacent to the gas contact surface.

It is a perspective view of the gas alarm device which attached the gas supply adapter of this invention. It is a disassembled perspective view of the gas alarm device of FIG. It is a vertical front view of the gas alarm device of FIG. It is a perspective view of the half cross section of a gas supply adapter. It is a top view of an adapter cover. It is a top view of an adapter case.

Embodiment
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a state in which a gas supply adapter 1 according to the present invention is attached to a portable gas alarm device 2. In this specification, the X-axis direction in FIG. 1 is referred to as “width direction”, the Y-axis direction is referred to as “vertical direction”, and the Z-axis direction is referred to as “front-rear direction”.

(Gas alarm)
As shown in FIG. 2, the gas alarm device 2 includes a main housing 3 having a rectangular housing having a rectangular cross section, four gas sensors S1 to S4, a sensor housing 7, a sensor packing 9, a dustproof and waterproof filter 10, and a main body. A sensor cover 6 that is fitted on the lower end of the housing 3 is provided.

  As shown in FIG. 3, the main housing 3 includes a speaker 4 as an alarm notification mechanism, a dry battery 5 as a power supply unit, and four gas sensors S1 to S4 that detect different types of gases.

As shown in FIG. 3, the four gas sensors S1 to S4 are arranged in parallel in the width direction at the lower end portion of the main housing 3, and each of the gas sensors S1 to S4 includes oxygen (O ₂ ), combustible gas (COMB). ), Hydrogen sulfide (H ₂ S), and carbon monoxide (CO). The type and number of gas sensors and the arrangement order thereof are not limited to the present embodiment, and may be changed as appropriate according to the configuration of the gas flow passage 25 described later, the type of gas to be detected, and the like. May be.

  Each of the gas sensors S1 to S4 is accommodated in four cylindrical accommodating portions 8 of the sensor housing 7, and a sensor packing 9 is provided at the lower end of the sensor housing 7, and between the sensor packing 9 and the sensor cover 6, A dustproof and waterproof filter 10 is interposed.

  As shown in FIG. 2, the sensor cover 6 is provided with circular gas passage holes H penetrating in the vertical direction in parallel with each other in the width direction.

(Gas supply adapter)
As shown in FIG. 2, the gas supply adapter 1 includes an adapter cover 20 and an adapter case 30.

  As shown in FIGS. 2 to 4, the adapter cover 20 is a cylindrical body having a rectangular cross section and a bottom, and a bottom portion 21 is provided on the lower end side thereof.

  As shown in FIGS. 3 and 4, an accommodation space B for accommodating the lower end portion of the gas alarm device 2 is formed above the bottom portion 21.

  As shown in FIGS. 1 and 2, on the left and right side surfaces of the adapter cover 20, there are provided retaining claws 22 whose tips are urged toward the center in the width direction. A protective cover 24 is provided on the outer periphery of the end portion of the claw member 22 in order to prevent the claw member 22 from being disengaged due to an unexpected impact applied to the claw member 22.

  When the gas supply adapter 1 is attached to the gas alarm device 2, the lower end portion of the gas alarm device 2 is fitted into the accommodation space B of the adapter cover 20 from above. Then, each of the tips of the two claw members 22 is engaged from above so as to get over the upright pieces 23 provided on the left and right side surfaces of the lower end portion of the gas alarm device 2, thereby removing the gas alarm device 2. A stop is made.

  The protective cover 24 can be slid up and down. When the protective cover 24 is moved upward, the end portion of the claw member 22 cannot be pushed inward, and when the protective cover 24 is moved downward, the claw member It is comprised so that the terminal part of 22 can be pushed inward.

  In a state where the protective cover 24 is positioned above, even if any impact is applied to the claw member 22, the end portion of the claw member 22 does not move inward, so that the tip of the claw member 22 does not move outward. Therefore, the engagement of the claw member 22 is not released.

  When removing the gas supply adapter 1, the protective cover 24 is moved downward, and then the protective cover 24 and the end portions of the claw members 22 are pushed inward together. As a result, the tip of the claw member 22 moves outward to get over the standing piece 23 of the gas alarm device 2, so that the gas supply adapter 1 can be removed from the gas alarm device 2.

  As shown in FIGS. 2, 4, and 5, protrusions T <b> 1 to T <b> 4 that protrude upward in a circular shape in plan view are arranged in parallel in the width direction on the bottom portion 21. An annular groove N is formed on the outer periphery of each of the protrusions T1 to T4, and an O-ring R is attached to the annular groove N.

  As shown in FIGS. 4 and 5, a first through hole P1 and a second through hole P2 penetrating in the vertical direction are formed on the left and right side surfaces of the protrusion T1, respectively. A third through hole P3 and a fourth through hole P4 penetrating in the vertical direction are also formed in each of the side surfaces.

  Each of the projecting portions T3 and T4 is formed with a first through space D1 and a second through space D2 penetrating in a rectangular vertical direction in plan view. As shown in FIG. 5, two semicircular walls W1 and W2 are provided in front and rear of the first through space D1, and the semicircular walls in front and rear of the second through space D2 are also provided. Two walls W3 and W4 are provided.

As shown in FIG. 6, the adapter case 30 is configured by a rectangular plate-like body in plan view.
As shown in FIG. 3, the first extension 31 that extends downward from the lower surface on the right end side of the paper surface of the adapter case 30 is formed with a gas supply port 32 that opens to the right side of the paper surface. A gas discharge port 34 that opens to the left side of the drawing is formed in the second extension 33 that extends downward at a position in the center in the width direction. A supply plug 35 is attached to the gas supply port 32, and a discharge plug 37 is attached to the gas discharge port 34.

  As shown in FIG. 6, a first opening 38 that communicates with the gas supply port 32 is provided on the right end side of the top surface of the adapter case 30. A groove M1 is formed on the outer periphery of the first opening 38, and a small packing C1 is attached to the groove M1.

  In addition, a U-shaped first flow path 39 is formed on the upper surface of the adapter case 30 in a plan view, and a linear second flow path 40 extending in the width direction is formed inside the first flow path 39. Has been. A second opening 41 that communicates with the gas discharge port 34 is provided at the right end of the second flow path 40 in the drawing.

  Grooves M2 and M3 are formed on the outer circumferences of the first flow path 39 and the second flow path 40, respectively, and a middle packing C2 and a large packing C3 are mounted in the grooves M2 and M3, respectively.

  As shown in FIGS. 2 and 3, the adapter case 30 is faced up with the first flow path 39 and the second flow path 40, and the first opening 38 is the first penetration of the protrusion T <b> 1. While the annular edge 26 provided at the lower end of the adapter cover 20 is fitted in the annular groove 36 provided on the outer periphery of the adapter case 30 in a state of being located directly below the hole P1, the adapter case 30 is Apply to the lower surface of 21. Then, screws 42 (see FIG. 4) are screwed into a plurality of screw holes formed at the edges of the adapter cover 20 and the adapter case 30 and fixed.

  As a result, the small packing C1, the middle packing C2, and the large packing C3 of the adapter case 30 are in close contact with the lower surface of the bottom portion 21, and the gas flow passage 25 that connects the gas supply port 32 and the gas discharge port 34 is formed. .

  Here, the gas flow passage 25 includes the first and second through holes P1 and P2 of the protruding portion T1 in the bottom portion 21, the first through space D1 of the protruding portion T2, the second through space D2 of the protruding portion T3, and the protruding portion T4. The third and fourth through holes P3 and P4 and the first and second flow paths 39 and 40 in the adapter case 30 are configured.

  That is, as shown in FIG. 4, in the gas flow passage 25, the gas supply port 32 communicates with the first through hole P1 of the protruding portion T1, and the second through hole P2 of the protruding portion T1 and the first of the adapter case 30 are connected. The end 39a of the flow path 39 communicates with the third through hole P3 of the protrusion T2 and the end 39b of the first flow path 39 of the adapter case 30 communicates with the fourth through hole P4 of the protrusion T2. The end 40a of the second flow path 40 communicates, the first through space D1 of the protrusion T3 and the second flow path 40 communicate, and the second through space D2 of the protrusion T4 and the second flow path. It is formed by communicating with 40.

(Air flow in the gas flow passage)
Hereinafter, based on FIGS. 3-6, the flow of the air in the gas flow path 25 is demonstrated. Note that the arrows shown by solid lines in FIGS. 3 and 4 indicate the flow of air.
As shown in FIG. 3, when the gas supply adapter 1 is attached to the gas alarm device 2, the tip portions of the projecting portions T <b> 1 to T <b> 4 of the bottom portion 21 are in the corresponding four gas passage holes H of the sensor cover 6. And is in contact with the dustproof and waterproof filter 10. At this time, each of the O-rings R of the bottom portion 21 is in close contact with the peripheral portion (the lower surface of the sensor cover 6) of the corresponding gas passage hole H. And gas sensor S1-S4 is arrange | positioned above each protrusion part T1-T4 of the bottom part 21. As shown in FIG.

  In this state, for example, a known gas suction pump device (not shown) is connected to the supply plug 35 of the gas supply adapter 1 via a connection tube (not shown), and external air is sucked by the gas suction pump device.

As shown in FIGS. 3 and 4, the sucked air passes through the gas supply port 32 from the supply plug 35 and directly from the first through hole P1 of the protruding portion T1 of the bottom portion 21 toward the gas sensor S1. Supplied. That is, the first through-hole P1 constitutes the direct supply gas supply channel air to a gas sensor S1 for detecting the oxygen in the air (O _2).

  Next, the air supplied to the gas sensor S1 passes through a flow path formed in the sensor packing 9 between the dustproof and waterproof filter 10 and the gas sensor S1, and then passes through the second through hole P2 of the protruding portion T1 of the bottom portion 21. It passes through and reaches the end 39 a of the first flow path 39 of the adapter case 30.

  Then, the air flows from the end 39a of the first flow path 39 to the end 39b, and is directly supplied from the third through hole P3 of the protrusion T2 of the bottom 21 toward the gas sensor S2. That is, the third through hole P3 constitutes a gas supply path that directly supplies air to the gas sensor S2 that detects the combustible gas (COMB) in the air.

  Next, the air supplied to the gas sensor S <b> 2 reaches the end 40 a of the second flow path 40 of the adapter case 30 through the fourth through hole P <b> 4 of the protruding portion T <b> 2 of the bottom portion 21. The air that has reached the end portion 40a flows along the second flow path 40 and reaches the first through space D1 of the protruding portion T3.

Since the second flow path 40 is provided in parallel to the gas contact surface of the gas sensor S3, the air that has reached the first through space D1 is not directly supplied to the gas sensor S3. It is supplied by diffusing through the through space D1. That is, the first through space D1 constitutes a space in which the introduced air is diffused and supplied to the gas sensor S3 that detects hydrogen sulfide (H ₂ S) in the air.

  Next, the air that has passed through the first through space D1 further flows along the second flow path 40 and reaches the second through space D2 of the protrusion T4. Since the second flow path 40 is provided in parallel to the gas contact surface of the gas sensor S4, in the second through space D2, air is supplied to the gas sensor S4 in the same manner as in the first through space D1. It is not supplied directly, but is supplied by diffusing through the second through space D2. That is, the 2nd penetration space D2 constitutes the space which diffuses and supplies the taken-in air with respect to gas sensor S4 which detects carbon monoxide (CO) in the air.

  The air that has passed through the second through space D2 further flows along the second flow path 40, reaches the second opening 41, passes through the gas discharge port 34, and is discharged to the outside from the discharge plug 37. .

  As shown in FIGS. 5 and 6, in this embodiment, the front-rear width L1 of the first through space D1 of the protrusion T3, the front-rear width L2 of the second through space D2 of the protrusion T4, and the second flow path. The width L3 of 40 is set to be approximately the same size (L1≈L2≈L3), and the first through space D1 of the projecting portion T3 and the second through space D2 of the projecting portion T4 are provided in the second flow path 40. Arranged directly above.

  If the front and rear widths L1 and L2 are set to be larger than the width L3, the volumes of the first and second through spaces D2 become large, so that the gas diffusion rate is slowed and the sensitivity of the gas sensor is lowered. Conversely, if the front and rear widths L1 and L2 are set smaller than the width L3, the gas diffusion rate does not change, but the amount of gas supplied per unit time decreases. This is to reduce the sensitivity.

In the gas alarm device 2 including the gas supply adapter 1 having the above-described configuration, the gas sensors S1 to S4 are detected gases (oxygen (O ₂ ), combustible gas (COMB)) contained in the air flowing through the gas flow passage 25. , Hydrogen sulfide (H ₂ S), and carbon monoxide (CO). Then, when the concentration of the detection target gas exceeds a set reference value, an alarm operation signal is generated, and the speaker 4 is activated to generate an alarm such as a buzzer sound.

[Other Embodiments]
In the above-described embodiment, the gas supply adapter 1 directly supplies air to the gas supply path (first through-hole P1 and third through-hole P3), and the space for diffusing the taken-in air to supply to the gas sensor (first Although it is provided with both the penetration space D1 and the 2nd penetration space D2), it is not limited to this composition, according to the gas sensor to be used, the composition provided only with the gas supply path which supplies air directly, It is good also as a structure provided only with the space which diffuses air and supplies to a gas sensor.

  The gas supply adapter according to the present invention can be used not only for a portable gas alarm device but also for a stationary gas alarm device.

DESCRIPTION OF SYMBOLS 1 Gas supply adapter 2 Gas alarm device S1-S4 Gas sensor P1-P4 1st-4th through-hole D1, D2 1st and 2nd through-space 25 Gas flow path 30 Adapter case 32 Gas supply port 34 Gas discharge port

Claims (5)

A gas supply port for taking in external air, a gas discharge port for discharging the air taken in from the gas supply port, and a gas flow passage connecting the gas supply port and the gas discharge port, A gas supply adapter connectable to a portable gas alarm having a gas sensor of
The gas flow path includes a main flow path and a secondary flow path,
The main flow passage has a portion that extends substantially parallel to a gas contact surface of at least one first gas sensor of the plurality of gas sensors and forms a gas flow passage with the gas contact surface ;
The secondary flow passage allows gas to flow through a gas contact surface of at least one second gas sensor other than the first gas sensor, and an end surface of the secondary flow passage faces the gas contact surface of the at least one second gas sensor. As described above, the gas supply adapter is branched at a portion extending substantially parallel to the gas contact surface of the second gas sensor in the main flow passage.   The gas supply adapter according to claim 1, wherein the secondary flow passage has a larger cross-sectional area compared to the main flow passage.   3. The gas supply adapter according to claim 1, wherein the side flow passage is branched from the main flow passage so as to form a space in a substantially vertical direction with respect to the main flow passage.   4. The gas supply adapter according to claim 1, wherein the secondary flow passage reduces the flow velocity of air passing through the main flow passage and supplies the second gas sensor to the second gas sensor. 5. The main passage further comprises a portion for supplying air substantially perpendicular to the gas contact surface of the first gas sensor, wherein the substantially vertically section for supplying air, adjoining a gas contact surface of the first gas sensor The gas supply adapter according to claim 1, wherein the gas supply adapter is configured to supply air to a portion that performs the operation.

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