JP7433675B2 - gas mixing device - Google Patents

Description

The present invention relates to a gas mixing device.

Patent Document 1 discloses a gas mixing device that mixes flammable gas (hydrogen gas) and non-flammable gas (nitrogen gas). The gas mixing device of Patent Document 1 includes a combustible gas generator that generates flammable gas, a non-flammable gas generator that generates non-flammable gas, a mixing device that mixes flammable gas and non-flammable gas, etc. By mounting both on the same base, the gas mixing device is made compact.

Japanese Patent Application Publication No. 2018-140361

By the way, this type of gas mixing device includes electrical equipment for supplying power to and electrically controlling each part of the gas mixing device. In order to make the gas mixing device compact, it is necessary to also mount electrical equipment on the same base. However, electrical equipment includes parts such as relay contacts and breakers that generate discharge and parts that can be charged with static electricity. For this reason, if a flammable gas generator and electrical equipment are carelessly mounted on the base, the flammable gas generated by the flammable gas generator may affect the electrical equipment.

The present invention has been made in view of the above-mentioned circumstances, and has an object to suppress the influence of flammable gas on electrical equipment even when a flammable gas generator and electrical equipment are mounted on the same base. The purpose is to provide a gas mixing device that can.

One aspect of the present invention is a gas mixing device that mixes a non-flammable gas and hydrogen gas , the device including a base and a hydrogen gas that is mounted on the base and generates the hydrogen gas and oxygen gas from water. a generator, an electric device mounted on the base for controlling the operation of the gas mixing device, a mixing device for mixing the hydrogen gas and the non-flammable gas, and connected to the mixing device by a path. and a storage tank for storing the mixed gas mixed by the mixing device, and the mixing device and the storage tank store the hydrogen gas on the base in a plan view when viewed from above the base . The hydrogen generator and the electric device are mounted in a different area from the mounting area of the generator and the electric device, and the hydrogen generator and the electric device are arranged so as not to overlap each other in a plan view when viewed from above the base, and the mixing device And the storage tank is a gas mixing device arranged so as to overlap each other in the vertical direction when viewed from above the base.

According to the present invention, even if the flammable gas generator and the electrical equipment are mounted on the same base, it is possible to prevent the flammable gas from affecting the electrical equipment in the gas mixing device.

FIG. 1 is a top view showing a gas mixing device according to an embodiment of the present invention. 2 is a front view of the gas mixing device shown in FIG. 1. FIG. 3 is a side view of the gas mixing device shown in FIGS. 1 and 2. FIG. FIG. 4 is a block diagram showing the gas mixing device of FIGS. 1 to 3. FIG.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.
A gas mixing device 1 according to the present embodiment shown in FIGS. 1 to 4 mixes flammable gas and non-flammable gas, and supplies the mixed gas to various devices such as a leak testing device. The mixed gas is used, for example, as a test gas in a leak test. The gas mixing device 1 of this embodiment is a hydrogen gas mixing device that uses hydrogen gas, which has a smaller specific gravity than air, as a combustible gas and uses nitrogen gas as a non-flammable gas.

The gas mixing device 1 includes a base 2, a hydrogen generator 3 (combustible gas generator), and an electric device 4. Further, the gas mixing device 1 includes a mixing device 5 and a storage tank 6. Further, the gas mixing device 1 includes a nitrogen supply device 7 (mixing gas supply device).

The hydrogen generator 3 generates hydrogen gas. The hydrogen generator 3 of this embodiment is a water electrolyzer that generates hydrogen gas and oxygen gas by electrolyzing water (water electrolysis). As shown in FIG. 4, the hydrogen generator 3 includes an oxygen exhaust path 10 for discharging oxygen gas from the hydrogen generator 3, and an oxygen exhaust path 10 for discharging oxygen gas from the hydrogen generator 3, and a nitrogen gas (dilution gas) for diluting the oxygen gas to the hydrogen generator 3. A nitrogen introduction path 11 is connected thereto. The hydrogen generator 3 also includes a first mixing path 12 for supplying hydrogen gas from the hydrogen generator 3 to the mixing device 5, and a first hydrogen exhaust path 13 for exhausting hydrogen gas from the hydrogen generator 3. It is connected.

The hydrogen generator 3 of this embodiment includes a water tank 31 that stores water and a hydrogen storage section 32 that stores generated hydrogen gas.
In the water tank 31, oxygen gas is generated by electrolysis of water. Specifically, in the water tank 31, water sent out from the water tank 31 is decomposed into hydrogen gas and oxygen gas by an electrolysis unit. The oxygen gas returns to the water tank 31 together with undecomposed water, and the oxygen gas is accumulated in the upper space of the water tank 31.

An oxygen exhaust path 10 and a nitrogen introduction path 11 are connected to the water tank 31 . Nitrogen introduction path 11 is connected to nitrogen supply device 7 . Therefore, nitrogen gas from the nitrogen supply device 7 is supplied to the water tank 31. Note that the nitrogen introduction path 11 may be connected to a nitrogen pressure vessel 8, which will be described later, for example. A flow meter 111 that measures the flow rate of nitrogen gas supplied to the water tank 31 is provided in the nitrogen introduction path 11 . Thereby, the flow rate of nitrogen gas supplied to the water tank 31 can be adjusted appropriately.

The oxygen gas generated in the water tank 31 is diluted with nitrogen gas supplied to the water tank 31 through the nitrogen introduction path 11, and then passes from the water tank 31 through the oxygen exhaust path 10 to the oxygen exhaust port 20 to the gas mixing device. 1 is released to the outside. The gas discharged from the oxygen exhaust port 20 has a sufficiently low concentration of oxygen gas and a sufficiently high concentration of nitrogen gas. That is, the gas released from the oxygen exhaust port 20 is substantially nitrogen gas (non-flammable gas). In this embodiment, the oxygen exhaust port 20 is open to the atmosphere. Note that the oxygen exhaust port 20 may be connected, for example, to a factory exhaust pipe (not shown) through which other exhaust gases flow.

A first mixing path 12 extending to the mixing device 5 is connected to the hydrogen storage section 32 . Thereby, hydrogen gas can be supplied from the hydrogen storage section 32 to the mixing device 5. Further, the first hydrogen exhaust path 13 is also connected to the hydrogen storage section 32 . A safety valve 131 is provided in the first hydrogen exhaust path 13 . As a result, when the pressure in the hydrogen storage section 32 becomes equal to or higher than a predetermined value, the safety valve 131 opens, and the hydrogen gas generated in the hydrogen storage section 32 passes through the first hydrogen exhaust path 13 and exits the hydrogen exhaust port 21 for gas mixing. It is released to the outside of the device 1. In this embodiment, the hydrogen exhaust port 21 is open to the atmosphere. Note that the hydrogen exhaust port 21 may be connected, for example, to a hydrogen exhaust pipe (not shown) of a factory through which hydrogen gas flows.

The nitrogen supply device 7 supplies nitrogen gas to be mixed with the hydrogen gas generated by the hydrogen generator 3. A second mixing path 14 for supplying nitrogen gas from the nitrogen supplier 7 to the mixing device 5 is connected to the nitrogen supplier 7 .

The nitrogen supply device 7 of this embodiment includes an air supply source 71 and a filter 72. Air supply source 71 is connected to filter 72 and supplies air to filter 72 . The air supply source 71 may be an air pipe through which air flows, a fan or a blower that flows air toward the filter 72, or the like. The filter 72 is, for example, a membrane module (membrane separation nitrogen gas generator), and separates and takes out nitrogen gas from the air taken in. That is, the filter 72 functions as a nitrogen generator (mixing gas generator) that generates relatively high concentration nitrogen gas.

The second mixing path 14 is connected to the filter 72 . Thereby, nitrogen gas can flow from the filter 72 to the second mixing path 14 and be supplied to the mixing device 5. Further, the filter 72 is connected to the separated gas exhaust path 15 and the separated gas exhaust port 22 in this order. The gas remaining after nitrogen gas is separated from the introduced air (hereinafter referred to as separated gas) flows through the separated gas exhaust path 15. The separated gas is discharged to the outside of the gas mixing device 1 from the separated gas exhaust port 22. The separated gas has a lower nitrogen concentration and a higher oxygen concentration than air. In this embodiment, the separated gas exhaust port 22 is open to the atmosphere. Note that the separated gas exhaust port 22 may be connected, for example, to a factory exhaust pipe (not shown) through which other exhaust gases flow.

The mixing device 5 mixes hydrogen gas from the hydrogen generator 3 and nitrogen gas from the nitrogen supply device 7. The concentration of hydrogen gas in the mixed gas mixed in the mixing device 5 is preferably within a low concentration range that does not become flammable. For example, ISO10156:2010 stipulates the concentration range of hydrogen gas that does not become flammable, and it is preferable to keep the concentration within that stipulated range. Most of the mixed gas is nitrogen gas (non-flammable gas).

Mixing device 5 is connected to hydrogen generator 3 via first mixing path 12 . The first mixing path 12 is provided with a solenoid valve 121 (normally closed solenoid valve in the illustrated example) that opens and closes it. Therefore, when the first mixing path 12 is opened by the solenoid valve 121, hydrogen gas is guided from the hydrogen generator 3 to the mixing device 5 through the first mixing path 12. Further, the mixing device 5 is connected to the nitrogen supply device 7 via a second mixing path 14 . The second mixing path 14 is provided with a solenoid valve 141 (normally closed solenoid valve in the illustrated example) that opens and closes it. Therefore, when the second mixing path 14 is opened by the solenoid valve 141, nitrogen gas is guided from the nitrogen supply device 7 to the mixing device 5 through the second mixing path 14. Thereby, hydrogen gas and nitrogen gas can be mixed in the mixing device 5.

The storage tank 6 stores the mixed gas mixed by the mixing device 5 described above. A compressor 51 and a check valve 52 are provided in a path connecting the mixing device 5 and the storage tank 6. The compressor 51 supplies the mixed gas from the mixing device 5 to the storage tank 6 in a compressed state. The check valve 52 prevents the compressed mixed gas from flowing back from the storage tank 6 to the mixing device 5 when the operation of the compressor 51 is stopped. Thereby, the mixed gas can be stored in the storage tank 6 at a pressure higher than the pressure of the mixed gas in the mixing device 5.

A supply path 16 and a supply port 25 are sequentially connected to the storage tank 6 for supplying the mixed gas in the storage tank 6 to various devices such as a leak test device. The supply path 16 is provided with a solenoid valve 161 (normally closed solenoid valve in the illustrated example) that opens and closes it. Therefore, when the supply route 16 is opened by the electromagnetic valve 161, the mixed gas passes through the supply route 16 from the storage tank 6 and is supplied from the supply port 25 to various devices such as a leak testing device.

A mixed gas exhaust path 17 is connected to a midway portion of the supply path 16 . A mixed gas exhaust port 23 is provided at the end of the mixed gas exhaust path 17 in the extending direction. The mixed gas exhaust path 17 is provided with a solenoid valve 171 (normally closed solenoid valve in the illustrated example) that opens and closes the mixed gas exhaust path 17. Therefore, when the mixed gas exhaust path 17 is opened by the electromagnetic valve 171, the mixed gas in the storage tank 6 is discharged to the outside of the gas mixing device 1 from the mixed gas exhaust port 23. In this embodiment, the mixed gas exhaust port 23 is open to the atmosphere. Note that the mixed gas exhaust port 23 may be connected to, for example, a factory exhaust pipe (not shown) through which other exhaust gases flow.

A second hydrogen exhaust path 18 is connected to a midway portion of the first mixing path 12 extending from the hydrogen generator 3 to the mixing device 5. The second hydrogen exhaust path 18 extends from the middle of the first mixing path 12 to the mixed gas exhaust path 17 described above. The second hydrogen exhaust path 18 is provided with a solenoid valve 181 (normally open solenoid valve in the illustrated example) that opens and closes the second hydrogen exhaust path 18 .

A nitrogen supply device 7 and a nitrogen pressure vessel 8 are connected to a midway point in the extension direction of the second hydrogen exhaust path 18 via a dilution gas path 19 . Nitrogen gas is stored in the nitrogen pressure vessel 8 in a compressed state. The nitrogen pressure vessel 8 may be a cylinder, a tank, or the like. The dilution gas path 19 is provided with a solenoid valve 191 (normally open solenoid valve in the illustrated example) that opens and closes the dilution gas path 19 . Therefore, when the second hydrogen exhaust path 18 and dilution gas path 19 are opened by the solenoid valve 191, nitrogen gas is introduced into the second hydrogen exhaust path 18 from the nitrogen supply device 7 and the nitrogen pressure vessel 8 through the dilution gas path 19. be done. Thereby, the hydrogen gas passing through the second hydrogen exhaust path 18 can be diluted with nitrogen gas and then discharged from the mixed gas exhaust port 23 to the outside of the gas mixing device 1 .

The diluent gas path 19 is branched in the middle and connected to the nitrogen supply device 7 and the nitrogen pressure vessel 8, respectively. A shuttle valve 194 is provided at a branch portion of the dilution gas path 19. The shuttle valve 194 causes the higher pressure of the nitrogen gas from the nitrogen supply device 7 and the nitrogen gas from the nitrogen pressure vessel 8 to flow toward the second hydrogen exhaust path 18 .

A regulator 182 and an orifice 183 are provided in a portion of the second hydrogen exhaust path 18 on the upstream side (on the first mixing path 12 side) of the joining portion with the diluent gas path 19 . The regulator 182 and orifice 183 adjust the flow rate of hydrogen gas flowing into the second hydrogen exhaust path 18. Similarly, the dilution gas path 19 is provided with a regulator 192 and an orifice 193 for adjusting the flow rate of nitrogen gas flowing through the dilution gas path 19. Note that the orifices 183 and 193 may be, for example, flow rate regulating valves (speed controllers).

By adjusting the flow rate of hydrogen gas flowing into the second hydrogen exhaust path 18 and adjusting the flow rate of nitrogen gas flowing into the dilution gas path 19, hydrogen gas and nitrogen gas released to the outside through the second hydrogen exhaust path 18 can be adjusted. The mixing ratio of hydrogen gas, that is, the concentration of hydrogen gas diluted with nitrogen gas, can be adjusted. In the mixed gas mixed in the second hydrogen exhaust path 18, the concentration of hydrogen gas is sufficiently low and the concentration of nitrogen gas is sufficiently high. That is, the mixed gas is substantially nitrogen gas (non-flammable gas).

The electric device 4 controls the operation of the gas mixing device 1 described above. The electrical equipment 4 controls, for example, the operations of the hydrogen generator 3, the nitrogen supply device 7, various electromagnetic valves 121, 141, 161, 171, 181, 191, the compressor 51, and the like.
The gas mixing device 1 includes a relay (not shown). In this embodiment, the relay is provided in the electrical equipment 4 and is used, for example, to operate the electromagnetic valves 121, 141, 161, 171, 181, 191. The relay is a solid state relay (SSR).

The above-mentioned hydrogen generator 3, electrical equipment 4, mixing equipment 5, and storage tank 6 are mainly mounted on the base 2 shown in FIGS. 1 to 3. Although not shown in FIGS. 1 to 3, a nitrogen supply device 7 and a nitrogen pressure vessel 8 (see FIG. 4) are also mounted on the base 2. Thereby, the gas mixing device 1 is configured compactly. The hydrogen generator 3, electric equipment 4, mixing equipment 5, storage tank 6, nitrogen supply device 7, and nitrogen pressure vessel 8 may be housed in a housing 27 integrated on the base 2, for example.
In FIGS. 1 to 3, the Z-axis direction indicates the vertical direction, and the X-axis direction and the Y-axis direction indicate the horizontal direction. Further, the Z-axis positive direction indicates the upper side in the vertical direction.

The hydrogen generator 3 and the electrical equipment 4 mounted on the base 2 are arranged so as not to overlap each other when viewed from above the base 2 as shown in FIG. In FIG. 1, the hydrogen generator 3 and electric equipment 4 are placed on the upper surface 2a of the base 2.

The mixing device 5 and the storage tank 6 are located in an area S1 on the base 2 that is different from the mounting area of the hydrogen generator 3 and the electric equipment 4 (hereinafter, other area S1) in a plan view seen from above the base 2. ). In this embodiment, the mixing device 5 and the storage tank 6 are arranged so as to overlap each other in a plan view seen from above the base 2. In FIGS. 2 and 3, the mixing device 5 is arranged above the storage tank 6, but it may be arranged below the storage tank 6, for example.
Although not shown, the nitrogen supply device 7 and the nitrogen pressure vessel 8 of this embodiment, like the mixing device 5 and the storage tank 6, are mounted in another area S1 when viewed from above the base 2. .

A plurality of casters 26 are attached to the lower side of the base 2. The casters 26 are preferably attached to the four corners of the base 2, for example. Thereby, the gas mixing device 1 can be easily moved on the floor surface G in a state where the gas mixing device 1 is placed on the floor surface G.

At the top of the gas mixing device 1, an oxygen exhaust port 20, a hydrogen exhaust port 21, a separated gas exhaust port 22, and a mixed gas exhaust port 23 are provided.
The hydrogen exhaust port 21 is an exhaust port that exhausts highly concentrated hydrogen gas, that is, combustible gas. On the other hand, gas having a sufficiently low oxygen concentration and a sufficiently high nitrogen concentration is exhausted from the oxygen exhaust port 20. Furthermore, gas having a sufficiently low hydrogen concentration and a sufficiently high nitrogen concentration is discharged from the mixed gas exhaust port 23. That is, both the oxygen exhaust port 20 and the mixed gas exhaust port 23 are exhaust ports that substantially exhaust nitrogen gas (non-flammable gas). From the separated gas exhaust port 22, a gas (separated gas) having a lower nitrogen concentration and a higher oxygen concentration than air is discharged.

The above-mentioned exhaust ports 20 to 23 (upper part of the gas mixing device 1) are all connected to the height of an adult based on the lower end of the gas mixing device 1 (floor surface G in the illustrated example) and the operator (adult) It is located higher than the work space WS (work space WS) around the device 1. The exhaust ports 20 to 23 are preferably located at a height of 1.7 m or more, and more preferably 2 m or more, with respect to the lower end (floor surface G) of the gas mixing device 1, for example.

The exhaust ports 20 to 23 may be provided, for example, on the side surface 27b of the casing 27, but in this embodiment, they are provided on the top surface 27a of the casing 27. Further, the exhaust ports 20 to 23 may be opened, for example, on the side of the housing 27 (in the X-axis direction or the Y-axis direction), but in this embodiment, they are opened on the upper side of the housing 27 (in the positive Z-axis direction). are doing.
In this embodiment, the height of the gas mixing device 1 (the height position of the upper surface 27a of the housing 27 with respect to the floor surface G) is about 1.7 m, and the exhaust ports 20 to 23 are located in the gas mixing device 1. It is provided on the upper surface 27a of. Therefore, the possibility that the gas exhausted from the exhaust ports 20 to 23 will be blown onto the work space WS or the worker working in the work space WS is low.

Next, an example of the operation of the gas mixing device 1 of this embodiment will be described.
In order to generate a mixed gas in the gas mixing device 1, the first and second mixing paths 12, 14 are opened in advance by the solenoid valves 121, 141, and the second hydrogen exhaust path 18 and the second hydrogen exhaust path 18 are opened by the solenoid valves 181, 191. Keep the dilution gas path 19 closed. Thereby, hydrogen gas from the hydrogen generator 3 and nitrogen gas from the nitrogen supply device 7 are guided to the mixing device 5 and mixed. The mixed gas of hydrogen gas and nitrogen gas mixed in the mixing device 5 is stored in a storage tank 6 in a compressed state. The mixed gas stored in the storage tank 6 can be supplied to various devices such as a leak test device through the supply port 25 by opening the supply path 16 with the solenoid valve 161.

When the gas mixing device 1 starts operating, the concentration of hydrogen gas or nitrogen gas supplied to the mixing device 5 may not be stable. For this reason, the mixed gas exhaust path 17 may be opened by the electromagnetic valve 171 to discharge the mixed gas in the storage tank 6 to the outside from the mixed gas exhaust port 23 until the concentration of hydrogen gas or nitrogen gas is stabilized.

When stopping the operation of the gas mixing device 1, the electromagnetic The mixed gas exhaust path 17 is opened by the valve 171. Thereby, the hydrogen gas remaining in the hydrogen storage section 32 of the hydrogen generator 3 is mixed with nitrogen gas from the nitrogen supply device 7 in the mixing device 5. The mixed gas mixed by the mixing device 5 passes through the storage tank 6 and the mixed gas exhaust path 17 and is discharged to the outside from the mixed gas exhaust port 23.

During operation of the gas mixing device 1, if an abnormality occurs in the gas mixing device 1 due to a power outage, etc., the solenoid valves 121, 141 close the first and second mixing paths 12, 14, and the solenoid valves 181, 191 close the first and second mixing paths 12, 14. The dihydrogen exhaust path 18 and dilution gas path 19 are opened. As a result, the hydrogen gas remaining in the hydrogen storage section 32 of the hydrogen generator 3 is passed through the second hydrogen exhaust path 18, and the second hydrogen gas is exhausted from the nitrogen supply device 7 and the nitrogen pressure vessel 8 through the dilution gas path 19. It is mixed with nitrogen gas introduced into path 18. The mixed gas mixed in the second hydrogen exhaust path 18 is discharged to the outside from the mixed gas exhaust port 23.

As described above, in the gas mixing device 1 according to the present embodiment, the hydrogen generator 3 and the electric device 4 are arranged so as not to overlap each other in a plan view seen from above the base 2. Therefore, even if hydrogen gas, which is lighter than air, leaks from the hydrogen generator 3 and heads upward, it is possible to prevent the hydrogen gas from reaching the electrical equipment 4. Thereby, even if the hydrogen generator 3 and the electrical equipment 4 are mounted on the same base 2, the influence of hydrogen gas on the electrical equipment 4 can be suppressed.

In addition, in the gas mixing device 1 of the present embodiment, the mixing device 5 and the storage tank 6 are located in the mounting area of the hydrogen generator 3 and the electric device 4 on the base 2 when viewed from above the base 2. It is mounted in a different area S1 (another area S1). Thereby, the mixing device 5 and the storage tank 6 can be mounted on the base 2 so as not to affect the hydrogen generator 3 and the electric device 4.

Further, in the gas mixing device 1 of this embodiment, the mixing device 5 and the storage tank 6 are arranged so as to overlap each other in a plan view seen from above the base 2. Therefore, the size of the base 2 in plan view can be reduced compared to the case where the mixing device 5 and the storage tank 6 do not overlap each other. That is, the area occupied by the gas mixing device 1 can be kept small. Since the mixing device 5 and the storage tank 6 are large in size among the components of the gas mixing device 1, by overlapping them, the exclusive area of the gas mixing device 1 can be effectively kept small.

Moreover, the relay with which the gas mixing device 1 of this embodiment is equipped is a solid state relay. As a result, no discharge or spark occurs in the relay, so that it is possible to suppress hydrogen gas from affecting the relay of the gas mixing device 1. Further, by providing the relay in the electrical equipment 4, it is possible to effectively suppress hydrogen gas leaking from the hydrogen generator 3 from affecting the relay.

Further, in the gas mixing device 1 of the present embodiment, an oxygen exhaust port 20 and a mixed gas exhaust port 23 that mainly discharge nitrogen gas (non-flammable gas), and a hydrogen exhaust port that discharges hydrogen gas (combustible gas) are provided. A port 21 is provided at the top of the gas mixing device 1 in both cases. Therefore, hydrogen gas and nitrogen gas can be exhausted from the exhaust ports 20, 21, and 23 above the work space WS around the gas mixing device 1. Thereby, hydrogen gas and nitrogen gas can be suppressed from affecting the worker (human body) working in the work space WS. Further, it is possible to suppress hydrogen gas from affecting the work space WS where sparks and discharges may occur due to various types of work.

Furthermore, in the gas mixing device 1 of this embodiment, the exhaust ports 20, 21, and 23 are located at a height of 1.7 m or more with respect to the lower end of the gas mixing device 1. Therefore, hydrogen gas and nitrogen gas discharged from the exhaust ports 20, 21, and 23 can be effectively prevented from floating in the work space WS where adult workers work. Thereby, it is possible to effectively suppress hydrogen gas and nitrogen gas from affecting the work space WS where sparks and discharges may occur during various tasks, and the workers (human bodies) working in the work space WS.

Further, according to the gas mixing device 1 of this embodiment, the exhaust ports 20 , 21 , 23 are open above the housing 27 . Therefore, compared to the case where the exhaust ports 20, 21, and 23 are opened to the side of the housing 27, hydrogen gas and nitrogen gas are directed downward from the exhaust ports 20, 21, and 23 (that is, toward the work space WS). ). To explain this point, hydrogen gas and nitrogen gas are emitted from the openings of the exhaust ports 20, 21, and 23 so as to spread around the openings. Therefore, if the exhaust ports 20, 21, and 23 are opened to the side of the housing 27, some of the hydrogen gas and nitrogen gas exhausted to the side from the exhaust ports 20, 21, and 23 are , 21, and 23 more easily. On the other hand, if the exhaust ports 20, 21, and 23 are opened above the housing 27, hydrogen gas and nitrogen gas are exhausted upward from the exhaust ports 20, 21, and 23, so that the hydrogen gas and nitrogen gas are exhausted. It is possible to reduce the possibility that the water will flow below the ports 20, 21, and 23.

Although the present invention has been described in detail above, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention.

In the gas mixing device of the present invention, the mixing device 5, the storage tank 6, the nitrogen supply device 7, and the nitrogen pressure vessel 8 are arranged so as to overlap with the hydrogen generator 3 and the electric device 4 when viewed from above the base 2. may be placed in

In the gas mixing device of the present invention, the separated gas exhaust port 22 may be provided at a location other than the top, such as at the bottom of the gas mixing device.

The flammable gas in the gas mixing device of the present invention is not limited to a combustible gas such as hydrogen gas, which has a specific gravity lower than that of air, but may also be a flammable gas having at least a different specific gravity from air. For example, if the specific gravity of the flammable gas is higher than that of air, even if the flammable gas leaks from the combustible gas generator and heads downward, it is possible to prevent the flammable gas from reaching the electrical equipment 4. I can do it. Therefore, the influence of flammable gas on the electrical equipment 4 can be suppressed similarly to the above embodiment.

The non-flammable gas in the gas mixing device of the present invention is not limited to nitrogen gas, and may be, for example, helium gas, argon gas, carbon dioxide gas, or the like.

1... Gas mixing device, 2... Base, 3... Hydrogen generator (flammable gas generator), 4... Electric equipment, 5... Mixing equipment, 6... Storage tank, 20... Oxygen exhaust port, 21... Hydrogen exhaust port , 22...Separated gas exhaust port, 23...Mixed gas exhaust port

Claims (5)

A gas mixing device for mixing non-flammable gas and hydrogen gas ,
a base; a hydrogen generator mounted on the base to generate the hydrogen gas and oxygen gas from water ; and an electric device mounted on the base to control the operation of the gas mixing device. , comprising a mixing device that mixes the hydrogen gas and the non-flammable gas, and a storage tank that is connected to the mixing device by a path and stores the mixed gas mixed by the mixing device,
The mixing device and the storage tank are mounted on the base in a different area from the mounting area of the hydrogen generator and the electric equipment on the base, as seen from above the base,
The hydrogen generator and the electric device are arranged so as not to overlap each other when viewed from above the base,
The mixing device and the storage tank are arranged so as to overlap each other in the vertical direction when viewed from above the base. Equipped with a relay,
The gas mixing device according to claim 1 , wherein the relay is a solid state relay. comprising an exhaust port for exhausting the hydrogen gas from the gas mixing device,
The gas mixing device according to claim 1 or 2, wherein the exhaust port is provided at an upper part of the gas mixing device. an exhaust port for exhausting the non-flammable gas from the gas mixing device;
The gas mixing device according to any one of claims 1 to 3, wherein the exhaust port is provided at an upper part of the gas mixing device. The gas mixing device according to claim 3 or 4, wherein the exhaust port is located at a height of 1.7 m or more with respect to the lower end of the gas mixing device.

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