JP6205086B1 - Gas explosion hazard sensation device - Google Patents

Abstract

A gas explosion danger sensation apparatus capable of easily and reliably causing a gas explosion is provided. The gas explosion danger sensation device 1 is a state in which a balloon 2 filled with a predetermined amount of gas is ruptured in an explosion chamber 11 having a predetermined volume so that the gas is diffused in the explosion chamber 11. Thus, a gas explosion is caused by energizing the electrodes 5 and 5 inserted into the explosion chamber 11, and the height position of the electrodes 5 and 5 can be changed. . [Selection] Figure 2

Description

  TECHNICAL FIELD The present invention relates to a gas explosion danger sensation apparatus, and more particularly, to an apparatus for experiencing the danger of a gas explosion by causing a gas explosion by igniting a gas filled in an explosion chamber. It is.

  A gas explosion is a phenomenon in which a mixture of flammable gas and air burns and undergoes rapid thermal expansion, resulting in flashes and explosion sounds. It may be invited. The combustible gas includes vaporized fuel such as methane gas, propane gas, city gas, and gasoline vapor. There are various triggers for the ignition of the mixture of combustible gas and air, such as static electricity and electrical sparks such as switches.

  It is known that a gas explosion occurs within a predetermined range of the mixing ratio of combustible gas and air. For example, in the case of city gas, it is known that the greatest explosive force is obtained when the concentration of gas in the air is 5 to 15%. By actually experiencing the above phenomenon, it is possible to deepen awareness of gas explosions and prevent accidents.

  In view of this, the present inventor has developed an apparatus for experiencing the danger of a gas explosion by igniting a gas in an explosion chamber and causing a gas explosion (Patent Document 1). Here, the gas concentration in the explosion chamber is adjusted by rupturing a balloon filled with gas in the explosion chamber having a constant volume. The amount of gas filled in the balloon is set in advance corresponding to the range of gas concentration in which a gas explosion can occur in the explosion chamber.

  However, it is difficult for the technique of Patent Document 1 to deal with all gases. In other words, depending on the type of gas, the gas is unevenly distributed in the upper or lower part of the explosion chamber, and there is a possibility that the gas explosion does not occur or the gas explosion does not easily occur.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a gas explosion danger sensation apparatus that can cause a gas explosion easily and reliably.

  According to the present invention, a balloon filled with a predetermined amount of gas is ruptured in a certain volume of the explosion chamber, thereby energizing an electrode inserted in the explosion chamber with the gas diffused in the explosion chamber. A gas explosion danger sensation device for causing a gas explosion, characterized in that the height position of the electrode can be changed.

  According to the present invention, since the height position of the electrode can be changed, the height position of the electrode can be set according to the type of gas. Therefore, in the case of a gas heavier than air, such as methane gas or propane gas, the height of the electrode can be set low so that the gas accumulated in the lower part of the explosion chamber can be ignited easily and reliably. Thus, in the case of a gas that is lighter than air, it is possible to easily and reliably ignite the gas accumulated above the explosion chamber by setting the height of the electrode high. As a result, the danger of a gas explosion can be experienced with more types of gases.

  Preferably, a receiving plate for receiving the balloon is provided, and the height position of the receiving plate can be changed.

  According to the invention of claim 2, since the receiving plate for receiving the balloon is provided and the height position of the receiving plate can be changed, the height position of the receiving plate can be set according to the type of gas. it can. Therefore, the gas can be easily and reliably ignited by the combination with the height position of the electrode.

  Preferably, the electrodes are provided at a plurality of different height positions.

  According to the invention of claim 3, since the electrodes are provided at a plurality of different height positions, the height positions of the electrodes can be set according to the type of gas.

  It is preferable to provide a select switch for selecting at least one electrode to be energized in each electrode.

  According to the fourth aspect of the present invention, since the select switch for selecting at least one electrode to be energized in each electrode is provided, an electrode corresponding to the type of gas can be selected. Simultaneous ignition is also possible.

  As in the invention described in claim 5, the explosion chamber is open at the top, the open end of the explosion chamber is closed with cardboard, the cardboard is pierced by a needle-like member, and the explosion chamber is put into the explosion chamber in advance. It is preferable to puncture the balloon in the explosion chamber by piercing the balloon.

  According to a fifth aspect of the present invention, the explosion chamber is open at the top, the open end of the explosion chamber is closed with cardboard, the cardboard is pierced with a needle-like member, and the explosion chamber is put in the explosion chamber in advance. Since the balloon is ruptured in the explosion chamber by piercing the balloon, the gas filled in the balloon can be reliably diffused in the explosion chamber. In addition, the use of cardboard increases the sound during a gas explosion. As a result, since it can be heard from the outside through the upper part of the explosion chamber, a gas explosion can be experienced through the auditory sense without providing a microphone in the explosion chamber.

  According to a sixth aspect of the present invention, a sampling chamber is provided below the explosion chamber, and a shutter that partitions the explosion chamber and the sampling chamber is provided so that the gas diffuses from the explosion chamber into the sampling chamber. It is preferable to sample the gas concentration in the sampling chamber by closing the shutter.

  According to the invention of claim 6, a sampling chamber is provided in the lower part of the explosion chamber, a shutter is provided for partitioning the explosion chamber and the sampling chamber, and the gas is diffused from the explosion chamber into the sampling chamber. Since the shutter is closed and the gas concentration in the sampling chamber is sampled and measured, the gas concentration can be accurately grasped.

  According to the present invention, since the height position of the electrode can be changed, the height position of the electrode can be set according to the type of gas. Therefore, in the case of a gas heavier than air, such as methane gas or propane gas, the height of the electrode can be set low so that the gas accumulated in the lower part of the explosion chamber can be ignited easily and reliably. Thus, in the case of a gas that is lighter than air, it is possible to easily and reliably ignite the gas accumulated above the explosion chamber by setting the height of the electrode high. As a result, the danger of a gas explosion can be experienced with more types of gases.

It is a front sectional view showing a schematic structure of a gas explosion danger sensation apparatus according to an embodiment of the present invention. It is front sectional drawing which shows the whole structure of the gas explosion danger sensation apparatus which concerns on this embodiment. It is a disassembled perspective view of the gas explosion danger experience apparatus which concerns on this embodiment. It is a schematic diagram around a gas cylinder. It is a figure around a clamp, and (a) is a front view and (b) is a side view. (A) is a top view of a balloon gauge, (b) is a top view of a cardboard gauge. It is a control block diagram of the gas explosion danger sensation apparatus according to the present embodiment. It is a flowchart which shows the use procedure of the gas explosion danger sensation apparatus which concerns on this embodiment, Comprising: (a) shows a pre-process, (b) shows an explosion process, (c) shows a post-process, respectively.

  FIG. 1 is a front sectional view showing a state in which a gas explosion danger sensation apparatus 1 according to an embodiment of the present invention is placed in a casing 100, and FIG. 2 is a front sectional view showing an overall configuration of the gas explosion danger sensation apparatus 1. 3 is an exploded perspective view thereof. In FIG. 1, the front side of the gas explosion danger sensation apparatus 1 when viewed from the user side may be referred to as the front side.

  As shown in FIGS. 1 to 3, the gas explosion danger sensation apparatus 1 according to the present embodiment ignites a gas explosion by filling the explosion chamber 11 with gas, thereby reducing the risk of gas explosion. This is a device for experiencing, and is configured to adjust the gas concentration in the explosion chamber 11 by rupturing the balloon 2 filled with gas in the explosion chamber 11 having a constant volume. The amount of gas filled in the balloon 2 is set in advance corresponding to the range of gas concentration within which the gas explosion can occur in the explosion chamber 11.

  The gas explosion danger sensation apparatus 1 is housed in a transparent housing 100. On the front side of the housing 100, there is a door 101 that is supported by hinges 102, 102 attached to two upper and lower portions on the right side, and a handle 103 attached to one middle portion on the left side. When the user grips and opens the door 101 to the front, the user makes various preparations for the experiment, and after the completion, the door 101 is closed and the experiment is performed. The confirmation of the closing of the door 101 and the confirmation of the closing of the shutter 6 are automatic start conditions of the gas explosion danger sensation apparatus 1. Thereby, the safety at the time of gas explosion danger experience is secured.

  The explosion chamber 11 includes a cylindrical main body 11a made of transparent quartz glass, a balloon receiving net 12 disposed in the middle of the cylindrical main body 11a, and an upper flange 13 disposed on the upper end side of the cylindrical main body 11a. The lower flange 14 disposed on the lower end side of the cylindrical main body 11a and the tie bolts 16 that support the flanges 13 and 14 at positions separated from each other in the height direction are provided. The cylindrical main body 11a may be translucent as long as a visitor can visually observe the inside, and this also applies to the casing 100.

  Lower electrodes 5a and 5a as the electrodes 5 and 5 are arranged to face each other slightly below the balloon receiving net 12 of the cylindrical main body 11a while being spaced apart from each other by a set distance. On the slightly upper side, the upper electrodes 5b and 5b as the electrodes 5 and 5 are also arranged so as to face each other with a set distance therebetween. By applying a voltage to at least one of the electrodes 5 and 5, the gas is ignited by discharge.

  The balloon receiving net 12 includes, for example, a circular bottom plate 12b having a plurality of through-holes, and a support portion 12a that supports four places around the bottom plate 12b so as to be suspended from the upper flange 13. The upper ends of these support portions 12a are screwed to the inner peripheral wall of the upper flange 13 through, for example, long holes so that the height position of the bottom plate 12b can be adjusted. In addition, since the through-hole diameter of the bottom plate 12b is not less than a so-called flame extinguishing distance, it does not prevent the explosion of the gas ignited by the electrodes 5 and 5 from being discharged.

  The upper flange 13 includes a flange portion fixed to the upper end side of the tie bolt 16 with a nut, and an extended portion slightly extending above the flange portion, and an upper lid 15 is attached to the extended portion. Screwing is possible. Between the upper surface of the upper flange 13 and the lower surface of the upper lid 15, the thick paper 3 cut out in a circular shape can be sandwiched. The cardboard 3 has a thickness of about 0.7 mm that can be broken by the needle-like member 4.

  The lower flange 14 has the tie bolts 16 planted at four locations around it, and can be clamped by the clamp member 7 to a support member standing from the base 8 at the peripheral edge thereof. A sampling chamber 17 is provided below the lower flange 14, and the explosion chamber 11 and the sampling chamber 17 are opened and closed by controlling the supply of air from the compressor 210 by opening and closing operation of an electromagnetic switch (not shown). A shutter 6 is provided.

  A purge pipe 9a, an air suction pipe 9b, and a sampling pipe 9c are connected to the bottom of the sampling chamber 17. By closing the shutter 6, the inside of the explosion chamber 11 can be substantially sealed, and gas sampling can be performed from the sampling tube 9c. On the other hand, when the shutter 6 is opened, air from the purge pipe 9a (which is also supplied from the compressor 210) can be introduced into the explosion chamber 11, and the air suction pipe after the purge is completed. External air can be introduced through 9b.

  4-6 is a figure which shows the periphery installation of the gas explosion danger sensation apparatus 1. FIG. 4 is a schematic view showing the periphery of the gas cylinder 20a, FIG. 5 (a) is a front view showing the periphery of the clamp 23, FIG. 5 (b) is a side view thereof, and FIG. 6 (a) is a plan view showing the balloon gauge 25. FIG. 6B is a plan view showing the cardboard gauge 31.

  As peripheral equipment of the gas explosion danger sensation apparatus 1 according to this embodiment, as shown in FIGS. 4 to 6, a gas cylinder 20a including a gas supply regulator 20d for filling the balloon 2 with gas and a valve 20f is provided. I have. Further, a clip 24 for tightening the mouth 22 of the balloon 2 filled with an accurate amount of gas in the main body 21 and the clip 24 are sandwiched from the gas cylinder 20a through the gas supply regulator 20d and the valve 20f. And a clamp 23 having a V-groove 23a for performing the tightening.

  Further, for example, a balloon gauge 25 provided with three through holes 26 having different sizes, such as Φd1, Φd2, and Φd3, is provided, and the balloon 2 filled with the gas has any size of the through holes 26. The gas filling amount of the balloon 2 can be accurately set by visually observing whether or not it can pass through.

  In addition, a long needle-like member 4 is provided to rupture the balloon 2 in a state in which the balloon 2 is placed in the explosion chamber 11. The distal end of the needle-like member 4 is formed in a spire shape, and a vertical circular grip portion is provided at the proximal end.

  Further, in order to cut out the cardboard 3 for maintaining the substantially airtight state in the explosion chamber 11 so as to have an accurate size, for example, a cardboard gauge 31 provided with two through holes 32 of the same size is provided. A circular cardboard that can be inserted between the extended portion of the upper flange 13 and the upper lid 15 simply by placing the cardboard gauge 31 on a commercially available cardboard and cutting it out along the through hole 32 with a cutter or the like. 3 is obtained.

  In addition, tweezers (not shown) are also provided for removing fragments of the balloon 2 ruptured in the explosion chamber 11, and the tweezers are opened by inserting the upper lid 15 of the explosion chamber 11 into the inside thereof. The balloon 2 remaining on the part is sandwiched and taken out to the outside.

  FIG. 7 is a control block diagram of the gas explosion danger sensation apparatus 1 according to the present embodiment.

  The control system of the gas explosion danger sensation apparatus 1 according to the present embodiment opens and closes the shutter 6 and the operation box 200 including the select switch 201, the operation switch 203, and a timer (not shown) as shown in FIG. Actuator 206 to be used, electromagnetic switch 207 for same use, electromagnetic switch 208 for opening / closing purge air supply line 9a, compressor 210 for supplying air to both electromagnetic switches 207 and 208, and pressure gauge 209 for same use. A reed switch 211 that detects the opening and closing of the door 101 of the housing 100, a gas detector 300 that measures the gas concentration in the explosion chamber 11, and a sampling pump 301 for the same.

  The select switch 201 is for switching between the lower electrodes 5a, 5a and the upper electrodes 5b, 5b, and the operation switch 203 is the lower electrode 5a, 5a or the upper electrode that has been switched with the select switch 201. This is for energizing the electrodes 5b and 5b via the transformers 212a and 212b.

  The operation box 200 further includes a transformer 212a for the lower electrodes 5a and 5a, a transformer 212b for the upper electrodes 5b and 5b, both electromagnetic switches 207 and 208, a reed switch 211, a gas detector 300, and a sampling pump. 301 are electrically connected to each other via an extension cord 200a and are detachably mounted on an operation box mounting table 220 provided on the front surface of the casing 100. By the action of this control system, gas is supplied. The explosion danger sensation apparatus 1 can be operated semi-automatically.

  In addition, when the reed switch 211 detects the open state of the door 101 of the housing 100 or the shutter 6 is not closed, even if the operation switch 203 is turned on, the lower electrodes 5a and 5a and the upper electrode An interlock is applied to prevent a gas explosion accident by preventing voltage from being applied to either of the electrodes 5b and 5b. By this interlock, the automatic start condition of the gas explosion danger sensation apparatus 1 is satisfied.

  Further, the gas detector 300 measures the concentration of the gas sucked by the sampling pump 301 through the sampling pipe 9c based on a predetermined detection principle and displays the peak value from time to time. It also has a so-called peak hold function.

  Hereinafter, the usage method of this gas explosion danger sensation apparatus 1 is demonstrated. FIG. 8 is a flowchart showing a procedure for using the gas explosion danger sensation apparatus 1 according to the present embodiment, wherein (a) shows a pre-process, (b) shows an explosion process, and (c) shows a post-process.

  The procedure for using the gas explosion danger sensation apparatus 1 according to the present embodiment can be broadly divided into a pre-process, an explosion process, and a post-process. Here, as an example of the gas, propane gas heavier than air is used. Therefore, as shown in FIG. 2, assuming that the lower electrodes 5a and 5a are used as the electrodes 5 and 5, the bottom plate 12b of the balloon receiving net 12 is set above the lower electrodes 5a and 5a. It shall be.

  First, as a pre-process, as shown in FIGS. 8A, 4 and 5, the balloon 2 is filled with propane gas supplied from the gas cylinder 20a (step S1). That is, it is confirmed that the original valve 20b of the gas cylinder 20a and the valve 20f of the gas injection nozzle 20g are closed. The gas supply regulator 20d is turned to the left toward the left to keep the resistance low. On the other hand, as shown by the alternate long and short dash line in FIG. 5, the clip 24 is set on the clamp 23 with the clip 24 opened upward.

  Subsequently, the former valve 20b of the gas cylinder 20a is opened, and the remaining amount of gas is confirmed by displaying the pressure gauge 20c. When the gas is exhausted, the original valve 20b is closed and the gas cylinder 20a is replaced. The gas supply regulator 20d is turned to the right and set so that the display of the pressure gauge 20e at the gas outlet becomes a fine pressure of 0.1 MPa or less, for example. In this case, if the gas pressure is too high, the balloon 2 expands all at once, so that the balloon 2 is filled with gas while the gas pressure is suppressed.

  Next, the mouth 22 of the balloon 2 is inserted to the back of the gas injection nozzle 20g. Grasp the mouth 22 of the balloon 2 firmly with your finger, and slowly open the valve 20f of the gas injection nozzle 20g. Then, the main body 21 of the balloon 2 is inflated until it becomes a slightly larger spherical shape than the desired size.

  Next, the valve 20f of the gas injection nozzle 20g is closed. Grasping its mouth 22 and pulling out the main body 21 from the gas injection nozzle 20 g so that the gas in the balloon 2 main body 21 does not leak. While gradually removing the gas from the main body 21 of the balloon 2, for example, the size of the main body 21 of the balloon 2 passes through a through hole 26 having a size of Φd2, for example, as shown in FIG. (Step S2). Thereby, the gas amount with which the balloon 2 is filled is set accurately.

  Then, when the mouth 22 of the balloon 2 is pulled and twisted, and the mouth 22 of the balloon 2 is inserted into the V groove 23a of the clamp 23 as shown by the alternate long and short dash line in FIGS. As indicated by the solid lines in FIGS. 5 (a) and 5 (b), the clip 24 is closed and the mouth 22 of the balloon 2 is tightened so that the gas cannot escape from the main body 21 of the balloon 2 (step S3).

  Next, as an explosion process, as shown in FIG. 8B, FIGS. 1 to 3 and FIG. 7, the balloon 2 filled with the gas is put into the gas explosion danger sensation apparatus 1 to perform a gas explosion. Wake up. For this purpose, the door 101 of the casing 100 is closed, the select switch 201 of the operation box 200 is switched from “upper electrode” to “lower electrode” as shown in FIG. 7, and the operation switch 203 is turned on. Then, the air from the compressor 210 is supplied to the actuator 206, the rod portion of the actuator 206 operates, and the shutter 6 mechanically connected to the rod portion is automatically opened (step S11). .

  When the door 101 is opened, the reed switch 211 detects the open state, the interlock works, and even if the operation switch 203 is turned on, voltage is applied to the lower electrodes 5a and 5a and the upper electrodes 5b and 5b. (Step S12). Under such a state, the upper lid 15 of the explosion chamber 11 is opened (step S13).

  That is, by screwing the upper lid 15 to the right side, for example, the screwing to the cylindrical main body 11a is released. The balloon 2 filled with the gas as described above is inserted so as to drop into the cylindrical body 11a of the explosion chamber 11 with the clip 24 facing downward. Then, the balloon 2 is placed on the bottom plate 12b of the balloon receiving net 12. However, if the upper electrodes 5b and 5b get in the way at this time, the main body 21 of the balloon 2 is preferably pushed lightly to be deformed. Then, with the cardboard 3 cut into a circular shape using a cardboard gauge 31 as shown in FIG. 6B placed on the upper end surface of the cylindrical body 11a of the explosion chamber 11, the upper lid 15 is removed. Then, by screwing in the opposite direction to the above, the tubular body 11a is screwed (step S14).

  The needle-like member 4 breaks the vicinity of the center of the cardboard 3 and pushes down the needle-like member 4 as it is, thereby piercing the main body 21 of the balloon 2 below and rupturing it (step S15). Then, the needle-like member 4 is extracted. Then, the gas filled in the main body 21 of the balloon 2 diffuses into the explosion chamber 11 and a uniform gas concentration can be obtained immediately. Then, it diffuses into the sampling chamber 17 below the explosion chamber 11 and accumulates there. A small hole is opened in the cardboard 3 by the needle-like member 4, but the amount of gas leakage from the small hole is negligible in a short time until the actual gas explosion occurs.

  By closing the door 101 again and closing the electromagnetic switch 207, the actuator 206 is closed to close the shutter 6 (step S16). After the shutter 6 is closed, the sampling pump 301 is activated to perform gas sampling from the sampling chamber 17 to the gas detector 300 via the sampling tube 9c (step S16a). Here, the gas detector 300 detects and displays the gas concentration that changes from moment to moment, but so-called peak hold display that holds the peak value is also possible. Therefore, the visitor can easily grasp the gas concentration that changes every moment and the peak value.

  Next, the select switch 201 of the operation box 200 is switched from “upper electrode” to “lower electrode” (step 16b).

  The blinking of the operation switch 203 is confirmed, and the operation switch 203 is turned on (step S17). At this time, the automatic activation can be performed only when the reed switch 211 detects the closed state of the door 101 and the shutter 6 is closed. That is, the operation switch 203 is lit. Then, after counting up for a preset time by the ignition timer, a voltage is applied to the lower electrodes 5a and 5a, and arc discharge between the lower electrodes 5a and 5a is started.

  As a result, the gas is automatically ignited, and a flash is generated in the explosion chamber 11, and at the same time, explosion sound is generated (step S18). The flash and explosion sound are observed from the outside through the transparent cylindrical main body 11 a and the door 101 of the transparent casing 100. Here, since the gas explosion in the explosion chamber 11 occurs in the transparent cylindrical body 11a, the flash generated by this gas explosion can be seen from the outside through substantially the entire circumference of the cylindrical body 11a. . Therefore, even when there are many visitors, a gas explosion can be experienced through almost everyone's vision without providing a camera etc. in the explosion chamber 11 or a narrow peep window.

  Further, the cylindrical main body 11a of the explosion chamber 11 is closed only by the cardboard 3 and the cardboard 3 blows off due to a gas explosion in the cylindrical main body 11a. The upper part is opened, and the explosion sound can be heard from the outside through the upper part of the cylindrical body 11a. Therefore, a gas explosion can be experienced through the auditory sense without providing a microphone or the like in the explosion chamber 11.

  Next, after the ignition time timer counts up for a preset time, the operation switch 203 is turned off, and it is understood that the gas explosion has been completed.

  After the operation switch 203 is turned off, the door 101 is opened, and the fragments of the balloon 2 in the cylindrical body 11a of the explosion chamber 11 are removed (step S21). For this purpose, after opening the door 101 of the housing 100, the upper lid 15 of the cylindrical main body 11a of the explosion chamber 11 is opened. That is, by screwing the upper lid 15 to the right side, the screwing to the cylindrical main body 11a is released. The tweezers (not shown) are pushed into the cylindrical main body 11a, lifted upward with the fragments of the balloon 2 sandwiched, and taken out to the outside. At this time, the fragments of the thick paper 3 remaining between the upper lid 15 and the upper end of the cylindrical main body 11a are also removed.

  Then, as a post process, as shown in FIGS. 8C and 7, the shutter 206 is opened by opening the actuator 206 by opening the electromagnetic switch 207. Thereafter, the electromagnetic switch 208 is also opened to supply air from the compressor 210 into the purge pipe 9a explosion chamber 11 and the sampling chamber 17, whereby the inside of the cylindrical main body 11a and the sampling chamber 17 are supplied. And so-called flushing operation is performed (step S22). After the purge is completed, outside air is sucked from the air suction pipe 9b, and the inside of the explosion chamber 11 and the sampling chamber 17 become atmospheric pressure. This completes the preparation for causing the next gas explosion.

  As described above, according to the gas explosion danger sensation apparatus 1 of the present embodiment, the explosion chamber 11 is made by rupturing the balloon 2 filled with a predetermined amount of gas in the explosion chamber 11 having a predetermined volume. Since the gas concentration in the explosion chamber 11 is adjusted, the gas concentration in the explosion chamber 11 can be accurately determined simply by dividing the amount (known) of the gas filled in the balloon 2 by the volume (known) in the explosion chamber 11. It can be calculated.

  Therefore, the gas detector 300 is originally unnecessary, but here, the gas detector 300 is intentionally provided to detect and display the gas concentration that changes every moment in the explosion chamber 11 and to display the peak value. By displaying it, the visitor can easily and surely grasp the range of gas concentration at the time of gas explosion.

  However, according to the gas explosion danger sensation apparatus 1 of the present embodiment, the gas is rapidly diffused into the explosion chamber 11 and the sampling chamber 17 with the momentum when the balloon 2 is ruptured to obtain a uniform gas concentration. Be able to. Therefore, there is no need to provide a circulation system between the gas concentration measuring instrument and the test container as in the prior art.

  That is, the gas explosion danger sensation apparatus 1 according to the present embodiment adjusts the gas concentration in the explosion chamber 11 at a stretch by a batch method using the balloon 2. Therefore, it takes less time for the gas concentration to reach the predetermined value and the gas consumption is smaller than that in which the gas concentration is gradually increased by circulating the gas in the circulation system.

  Moreover, the gas explosion danger sensation apparatus 1 of the present embodiment can easily reduce the amount of gas in the balloon 2 by degassing the balloon 2. Therefore, if the gas concentration in the circulation system exceeds the predetermined value due to the time lag of the gas concentration measuring device, the gas concentration has to reach the predetermined value because there is no choice but to wait for the gas concentration to drop naturally due to gas leakage from the container. There is no problem that it takes a long time to become the gas concentration, and the rate of increasing the gas concentration has to be slowed so that the gas concentration does not become excessive.

  Further, in the gas explosion danger sensation apparatus 1 according to the present embodiment, even when a residual gas in the explosion chamber 11 is removed and reset after a gas explosion has occurred, only the explosion chamber 11 and the sampling chamber 17 are in the air. Just purge with. Therefore, it is possible to reset in a shorter time than when it is necessary to remove residual gas in the circulation system.

  Furthermore, according to the gas explosion danger sensation apparatus 1 of the present embodiment, since the height positions of the electrodes 5 and 5 can be changed, the height positions of the electrodes 5 and 5 can be set according to the type of gas. Can do. Therefore, in the case of a gas heavier than air, such as methane gas or propane gas, the height position of the electrodes 5 and 5 can be set low so that the gas accumulated in the lower part of the explosion chamber 11 can be easily and reliably ignited. In the case of a gas that is lighter than air, such as gas or gasoline vapor, the height of the electrodes 5 and 5 can be set high so that the gas accumulated above the explosion chamber 11 can be easily and reliably ignited. As a result, the danger of a gas explosion can be experienced with more types of gases.

  In the above embodiment, propane gas is used as the gas causing the explosion. However, in addition to propane gas, vaporized fuel such as methane gas, butane gas, city gas, and gasoline vapor may be used. It may be good or a mixture of both. In that case, it is good also as igniting only by the upper electrodes 5b and 5b, and good also as igniting simultaneously by both the lower electrodes 5a and 5a and the upper electrodes 5b and 5b.

  Moreover, in the said embodiment, although the gas explosion danger sensation apparatus 1 is set in the transparent housing | casing 100, this is not necessarily requested | required. However, it is of course preferable to set the gas explosion danger sensation apparatus 1 in the housing 100 for safety reasons.

  Moreover, in the said embodiment, the operation box 200 is provided, the remote operation of the gas explosion danger sensation apparatus 1 and automatic start-up are performed by operation from this operation box 200, and the door 101 of the said housing | casing 100 is set as the automatic start conditions. However, it is not necessary to apply all of them, and only some of them may be applied, or other control systems may be provided. Good. For example, an interlock based on pressure detection by the pressure gauge 209 of the compressor 210 may be added.

  In the above embodiment, the operation box 200 includes only the select switch 201 and the operation switch 203 for switching between the lower electrodes 5a and 5a and the upper electrodes 5b and 5b. In addition, a select switch for switching between manual activation and automatic activation, an operation switch for the same, and the like may be provided.

  In the above embodiment, the electrodes 5 and 5 are provided with two pairs of the lower electrodes 5a and 5a and the upper electrodes 5b and 5b. However, a pair of electrodes is provided so that the electrodes can be moved up and down. Alternatively, three or more pairs of electrodes may be provided. As a moving method, for example, one or a plurality of dummy holes and a closing plate may be provided at an appropriate height position of the cylindrical main body 11a of the explosion chamber 11, and a pair of electrodes may be appropriately replaced.

  Moreover, in the said embodiment, although the electrode which generate | occur | produces an arc is used for both the lower electrodes 5a and 5a and the upper electrodes 5b and 5b as the electrodes 5 and 5, it replaces with this and uses the electrode which generate | occur | produces static electricity. May be.

  In the above embodiment, cardboard is used, but instead of this, depending on the thickness, a plosive sound is reduced, but tracing paper or the like may be used, or cork may be used. .

  Further, in the above embodiment, the gas concentration in the explosion chamber 11 is adjusted by rupturing the balloon 2 filled with a predetermined amount of gas in the explosion chamber 11 having a constant volume. Of course, the detector 300 may be omitted.

DESCRIPTION OF SYMBOLS 1 Gas explosion danger sensation apparatus 2 Balloon 3 Thick paper 5, 5 Electrode 5a, 5a Lower electrode 5b, 5b Upper electrode 6 Shutter 11 Explosion chamber 11a Tubular body 12 Balloon receiving net 13 Upper flange 14 Lower flange 15 Upper lid 17 Sampling chamber 25 Balloon gauge 31 Cardboard gauge 100 Case 101 Door 200 Operation box 201 Select switch 203 Operation switch 300 Gas detector

Utility Model Registration No. 3144175

Claims (6)

When a balloon filled with a predetermined amount of gas is ruptured in a certain volume of the explosion chamber, the gas is diffused in the explosion chamber, and a gas explosion occurs by energizing the electrode inserted in the explosion chamber. A gas explosion danger sensation device
A gas explosion danger sensation apparatus characterized in that the height position of the electrode can be changed.   The gas explosion danger sensation apparatus according to claim 1, wherein a receiving plate for receiving the balloon is provided, and the height position of the receiving plate is changeable.   The gas explosion danger sensation apparatus according to claim 1 or 2, wherein the electrodes are provided at a plurality of different height positions.   4. The gas explosion danger sensation apparatus according to claim 3, further comprising a select switch for selecting at least one electrode to be energized in each electrode.   The explosive chamber is open at the top, and the open end of the explosive chamber is closed with cardboard, and the cardboard is pierced with a needle-like member and stabbed into the balloon that has been put in the explosion chamber in advance. The gas explosion danger sensation apparatus according to claim 1, wherein the balloon is ruptured in the explosion chamber.   A sampling chamber is provided at a lower portion of the explosion chamber, and a shutter for partitioning the explosion chamber and the sampling chamber is provided. The shutter is closed in a state where the gas is diffused from the explosion chamber into the sampling chamber. 6. The gas explosion danger sensation apparatus according to claim 1, wherein the gas concentration is measured by sampling.

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