JP5001665B2 - Fan for blowing high temperature fuel gas in solid oxide fuel cells - Google Patents

Description

The present invention relates to a high-temperature fuel gas blowing fan to be applied to the solid body oxide fuel cell process.

  In various heat treatment furnaces and firing furnaces, a high-temperature gas blowing fan may be used for the purpose of circulating or stirring the furnace gas to make the furnace temperature uniform and improve the heating efficiency.

In the solid oxide fuel cell process, since the operating temperature required for power generation is 700 to 1000 ° C., fuel gas such as natural gas or coal gas, which is a supply source of hydrogen and carbon monoxide, serving as fuel is 700 to It is heated to 1000 ° C. and supplied to the fuel electrode of the fuel cell.
Rather than supplying this fuel gas directly to the fuel electrode and reacting it, it is better to react high-temperature fuel gas with water vapor as shown in the following equation to produce pure hydrogen, so-called steam reforming and then supplying it to the fuel electrode It has been pointed out that reaction efficiency is improved and power generation efficiency is increased.
(Reaction formula of steam reforming) CH ₄ + 2H ₂ O → CO ₂ + 4H ₂
In order to perform steam reforming, it is necessary to humidify the fuel gas. However, when humidifying using industrial water or household water, impurities contained in the water contaminate or corrode the fuel cell body, and have a fatal adverse effect on the performance and durability of the fuel cell body. Also, it was not practical to install a device for completely removing the impurities in the supply water line because of problems in installation space and initial investment.

In a solid oxide fuel cell, water, which is a reaction product of hydrogen and oxygen, is generated on the fuel electrode side to which fuel gas is supplied. That is, when the fuel gas supplied to the fuel electrode reacts at the fuel electrode, it is humidified by the generated water at the same time. Since the generated water does not contain impurities, if the humidified fuel gas can be circulated and reused, steam reforming by humidification of the fuel gas becomes possible before the reaction, and an increase in power generation efficiency is realized.
In addition, the fuel gas heated to 700 to 1000 ° C. supplied to the fuel electrode cannot react with all the hydrogen and carbon monoxide that can be reacted in a single contact with the fuel electrode. By circulating and reusing the fuel gas, the fuel gas can be used efficiently, and the sensible heat of the fuel gas can be reused. In this respect as well, the power generation efficiency increases.
For the aforementioned reasons, it has been seriously studied to apply a high-temperature gas blowing fan to the solid oxide fuel cell process to circulate the high-temperature fuel gas.

  On the other hand, the temperature of the high-temperature fuel gas is lowered to about 100 ° C. by a heat exchanger or the like, the pressure of the fuel gas is increased by a normal fan that can be used up to 100 ° C., and then the fuel gas is again set to the operating temperature of 700 to 1000 ° C. Although a heating configuration is conceivable, this configuration is not practical at all in view of heat loss, heat exchanger cost, and installation space.

When applying a hot gas blowing fan to a solid oxide fuel cell process or the like, the following conditions must be satisfied.
1) Hot fuel gas is flammable and can be lethal in some processes, so hot fuel gas should not leak out of the system.
2) The utility must not be used other than the DC power supplied from the fuel cell system itself because it may be used as a distributed power source in remote areas and the fuel cell system itself is simplified. The amount used must be about 5% or less of the amount of power generated.
3) It must be compact because it is installed as a distributed power source in ordinary homes and small apartment buildings.
4) The initial investment is small. Specifically, 5% or less of the sales price of the fuel cell system is desirable.
5) In order to prevent dew condensation of the high temperature fuel gas, the temperature of the portion exposed to the high temperature fuel gas should always be higher than the dew point temperature.

As described above, in the solid oxide fuel cell process, it is important from the viewpoint of safety and economy that the high temperature fuel gas is not leaked to the outside.
Conventionally, as a shaft sealing method for a high-temperature gas blower fan, a first shaft sealing device is inserted through a rotating shaft between a cooling unit disposed between a heat insulating layer and a bearing and the bearing, and is rotated. In general, a second shaft sealing device is inserted through the rotating shaft between a second bearing mounted on the motor side of the shaft and a shaft coupling provided at the shaft end of the rotating shaft. As the first and second shaft seal devices, a gland packing, an oil seal, an O-ring, a labyrinth, a mechanical seal, and the like are used.

Among these shaft seal devices, the gland packing, oil seal, and O-ring are made of rubber and synthetic resin, so they are sensitive to gas properties and temperature and cannot be expected to last for several years. Particularly in a solid oxide fuel cell process or the like, since the high-temperature fuel gas that is a process gas contains hydrogen and carbon monoxide, the rubber and synthetic resin-based sealing technology has poor reliability because of high reducibility.
As for the labyrinth and the mechanical seal, the internal process gas is not leaked to the outside. Therefore, it is necessary to push back with the purge gas at all times, and it is inevitable that the purge gas is mixed into the internal process gas. In a solid oxide fuel cell process or the like, the purity of a process gas is very important in terms of process performance, and generally a purge gas is not allowed to be mixed. In the case of a solid oxide fuel cell process or the like, if a purge gas is used, it is considered that an expensive inert gas such as nitrogen or helium is used. However, utility costs increase, resulting in an increase in unit price of power generation. . Further, in the case of a solid oxide fuel cell or the like installed as a distributed power source in a general household or a small apartment house, problems such as purge gas cylinder space, safety management, and replenishment occur, which is not realistic.
As described above, a compact and simple complete gastight shaft seal device without using a utility other than a power source has not been practically present.

  The bearing heat resistance temperature at which the bearing mounted on the rotating shaft to support the impeller in a cantilevered manner can be used in good condition for a long time is limited by the heat resistance temperature of the lubricant such as grease used for lubricating the bearing. The temperature is about 150 ° C., and it is necessary to extract the heat flux transferred from the impeller through the rotating shaft and further through the heat insulating layer disposed between the impeller and the bearing, and to cool the bearing portion temperature to a predetermined temperature or less. . The heat removal referred to here means receiving heat flux and dissipating heat.

  As a means for this, in the conventional hot gas blowing fan, water cooling is performed between the impeller and the bearing that are in direct contact with the hot gas, in a state of being coaxial and non-contact with the rotating shaft and in direct contact with the outer ring of the bearing. A jacket is provided, cooling water cooled to, for example, 30 ° C. or less is supplied to the water-cooling jacket, the surface temperature of the water-cooling jacket is maintained at, for example, 50 ° C. or less, and the rotating shaft is radiatively cooled. A method of cooling by heat conduction between the two is generally employed. In addition, there may be a method of removing heat while lubricating by directly contacting the rotating shaft and the bearing with a lubricating oil cooled to, for example, 30 ° C. or less.

However, these conventional cooling methods require a device such as a pump for circulating and supplying water or lubricating oil as a heat removal medium, a cooling device for cooling the heat removal medium, and piping connecting these devices. The entire system is complicated and has the disadvantage of hindering compact installation space, especially for solid oxide fuel cells installed as distributed power sources in ordinary homes and small-scale apartments, etc. It was a major impediment to fan introduction.
In solid oxide fuel cells using natural gas as fuel, the dew point of the fuel gas, that is, the process gas, is about 70 ° C., so the heat removal medium such as low-temperature water or lubricating oil is used as described above. As a result, overcooling occurs, condensation is formed in the vicinity of the cooling part such as a water-cooled jacket, and the bearing is deteriorated, and the fuel cell body deteriorates due to corrosion, elution and scattering of contaminants derived from condensation of moisture. There was a problem that had a fatal adverse effect on durability.

In addition, it is necessary to cope with the deterioration of water and lubricating oil as a heat removal medium and to supply a reduced amount. For example, continuous operation without maintenance for 24 hours × 365 days × 3 years has been considered difficult.
Furthermore, when the power supply of a device such as a pump that circulates and supplies the heat removal medium fails, or when the device itself fails and the heat removal medium supply stops, heating of the hot gas is stopped by an electrical control mechanism However, there is a possibility that the shaft seal device and the bearing may be fatally damaged depending on the amount of heat stored in the high-temperature gas at 700 to 1000 ° C. inside the device or the heat insulating material heated to a high temperature.

Further, although the seal structure is not practical, a method of conceptually cooling the rotating shaft and the bearing directly using a cooling fan is also conceivable. However, the heat transfer coefficient representing the heat removal capability is 1000 to 3000 w / m ² K in the case of water, whereas it is very small as 10 to 30 w / m ² K in the case of air. In order to realize a cooling effect equivalent to water cooling by air cooling, the area of the heat removal portion needs to be about 100 to 300 times that in the case of water cooling, and the heat removal portion is placed in a limited space around the rotating shaft and the bearing. It was difficult to install.

Although Patent Document 1 technically solves all the problems of the above-described conventional technology, the number of parts is large and there is a problem in cost during mass production.
The target cost for mass production of solid oxide fuel cells is assumed to be $ 1000 per 1kW of power generation. Assuming a 5 kW fuel cell that is expected to be popular for home use etc., the cost is $ 5000, and the cost of the hot gas blowing fan used in the system is less than $ 250, which corresponds to 5% or less of the fuel cell cost. It is necessary to realize. In order to realize the above-mentioned cost at the time of mass production, it is fatal that the number of parts is large.
WO2004 / 70209 Publication

An object of the present invention is to solve the problems of the aforementioned prior art, to provide a hot fuel gas blowing fan of the solid oxide fuel cell.

The present invention includes a heat-resistant impeller that is cantilevered on a rotating shaft, a thermally conductive bearing box that supports a bearing of the rotating shaft, and a heat insulating block that is disposed between the impeller and the bearing box. A high-temperature gas blowing fan comprising:
The rotor of the motor is disposed at the shaft end opposite to the impeller of the rotating shaft by cantilever support in the bearing housing, and the stator of the motor disposed in a non-contact state with the rotor on the outer periphery of the rotor A bearing flange is supported and fixed to the inner peripheral portion of the bearing box, and a sealing flange is disposed at an end of the bearing box opposite to the impeller, and a bearing box cooling heat sink is directly or via the sealing flange. A fan for blowing high-temperature fuel gas in a solid oxide fuel cell, wherein the fan is disposed.

A preferred embodiment of the present invention, the in sealing flange, holes for guiding a power line of the motor and / or a cable for signal lines to the outside and is disposed, the cable and the inner peripheral portion of the hole The high-temperature gas blown by the rotation of the impeller is hermetically sealed against the outside by hermetically fixing the gap between

  Furthermore, in a preferred embodiment of the present invention, a nonmagnetic and nonconductive hermetic partition wall is disposed in a hermetic partition in a radial gap between the rotor and the stator, and the rotor is disposed in the hermetic partition wall. It is characterized by providing. As the airtight partition wall, a resin-made partition wall can be preferably used.

  According to the present invention, a simple and completely gas tight high temperature gas sealing structure can be obtained without using a utility other than a power source, so the number of parts of the high temperature gas blowing fan can be greatly reduced, and the cost during mass production can be reduced. Become.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side sectional view of a hot gas blowing fan showing a first embodiment of the present invention. In FIG. 1, 1 is a rotating shaft, 2 is an impeller, 3 is an impeller side bearing, 4 is an anti-impeller side bearing, 5 is a heat insulating block, 6 is a bearing box, 7 is a rotor, 8 is a stator, 9 is a sealing flange, 10 is a rotation control sensor, 11 is a rotation control magnet, 12 is a stator connection cable, 13 is a sensor connection cable, 14 is a suction port, 15 is a discharge port, 16 is a casing, 17 is a seal packing, and 18 is a cable drawer A hole, 19 is a heat insulating layer, and 20 is a heat insulating block fixing plate.

In FIG. 1, the hot gas is sucked from the suction port 14, and is increased in pressure by the rotation of the impeller 2 including the rotor blades and the disk, and is discharged from the discharge port 15. Therefore, the temperature of the impeller 2 reaches a temperature level equal to or higher than the high-temperature gas temperature, for example, 700 ° C. or higher. In order to rotate at high speed under such a high temperature, a large centrifugal stress is generated particularly at the root part of the impeller 2 rotor blade.
Moreover, since the high-temperature fuel gas, which is a high-temperature gas in the case of the solid oxide fuel cell process, contains 30 to 50% of water vapor by volume, consideration must be given to deterioration of material strength due to high-temperature steam oxidation.

  Therefore, the impeller 2 that is in direct contact with the high-temperature gas, or the impeller 2 and the rotating shaft 1 must be made of a material that has high-temperature strength and excellent resistance to high-temperature steam oxidation. In this embodiment, Incoloy 800H (trade name), which is a Fe—Ni—Cr alloy, is used for the impeller 2 and the rotating shaft 1, but a Ni—Cr—Co alloy or the like may be used. More preferably, dense silicon carbide having a porosity of 10% or less, ceramics such as silicon nitride and Sialon (registered trademark) are employed.

The heat insulating block 5 is preferably made of a material having low thermal conductivity in order to minimize the amount of heat transfer from the high temperature gas to be blown to the bearing housing 6 and to reduce the temperature drop of the high temperature gas and the temperature rise of the bearing housing 6. In this embodiment, fireproof and heat insulating bricks are employed, but ceramic fiber molded products may be used.
In the present embodiment, the heat insulating layer 19 is made of ceramic fiber, and the heat transfer amount from the high temperature gas to the bearing housing 6 is reduced similarly to the heat insulating block 5. The heat insulating block 5 prevents the ceramic fiber from being lost to the high temperature gas flow path.

  The bearing box 6 is preferably made of a material having high thermal conductivity in order to efficiently dissipate the amount of heat transferred from the high temperature gas to the bearing box 6 to the outside. The bearing housing 6 is preferably made of a material having mechanical strength to which the bearing of the rotary shaft 1 (impeller side bearing 3 and anti-impeller side bearing 4) and the motor stator 8 can be attached. In this embodiment, copper is used, but the present invention is not limited to this. For example, a copper alloy or an aluminum alloy may be used. In the case of an aluminum alloy, the thermal conductivity is inferior to copper, but it can be manufactured at a low cost by a method such as aluminum die casting, so it has an advantage in mass production cost.

  In the present invention, the rotary shaft 1 is preferably supported on the bearing housing 6 by the impeller side bearing 3 and the anti-impeller side bearing 4. In this way, by supporting with two bearings separated by a certain distance, the mounting of the rotating shaft 1 to the bearing housing 6 can be stabilized. The impeller 2 is cantilevered by the rotating shaft 1 supported by the bearing housing 6. A rotor 7 of the motor is disposed on the shaft end of the rotating shaft 1 opposite to the impeller 2, and the stator 8 of the motor is disposed on the outer periphery of the rotor 7 in the non-contact state with the rotor. The motor is configured by supporting and fixing to the part. Thus, the rotating shaft 1 can be a motor driving shaft, and the motor of the impeller 2 can be built in the bearing housing 6.

In the present embodiment, a DC brushless motor is used for the rotor 7 and the stator 8 of the motor disposed in the bearing housing 6, but an AC motor may be used.
In the present embodiment, a hall sensor including a rotation control sensor 10 and a rotation control magnet 11 is disposed in the vicinity of the rotor 7, but more preferably, if a sensorless type motor is used, the number of parts is further reduced. This is advantageous in terms of mass production costs.

When this embodiment is compared with Patent Document 1, in the case of this embodiment, the rotor 7 and the stator 8 constituting the motor are built in the bearing housing 6, so that not only the shape becomes compact, but also the rotating shaft of the motor This eliminates the need for bearings, shaft joints that connect the motor rotation shaft and fan rotation shaft, and the motor case, which greatly reduces the number of components and is very advantageous in terms of mass production costs.
In this embodiment, the fan rotational speed is set to a very high rotational speed of 20000 rpm in order to make the shape more compact. In order to rotate the fan at such a high rotational speed, it is necessary to adjust the balance of the rotating body with high accuracy. High-accuracy balance adjustment has a higher cost than that of general accuracy. Since the motor rotation shaft is not required, the balance adjustment can be performed only by adjusting the fan shaft. This point also has a great effect on mass production costs.

FIG. 2 shows a front view (left side view of FIG. 1) of the hot gas blowing fan of this embodiment. In FIG. 2, 2 is an impeller, 14 is a suction port, and 15 is a discharge port.
A portion including the suction port 14, the outer peripheral gas flow path of the impeller 2 and the discharge portion 15 is a portion for efficiently boosting and blowing high-temperature gas and is also referred to as a scroll portion. When more importance is placed on the efficiency, the outer peripheral gas flow path of the impeller 2 is increased in cross-sectional area as it approaches the discharge part 15, that is, a design is adopted in which the gas flow velocity in each part of the gas flow path is made more uniform. Complicated and mass production costs are negative. Therefore, in this embodiment, the cross-sectional area of the outer peripheral gas flow path of the impeller 2 is constant and the shape is simplified.

FIG. 3 is a side sectional view of a hot gas blowing fan showing a second embodiment of the present invention. In FIG. 3, 6 is a bearing box and 21 is a heat sink. The same parts as those in FIG. 1 that are not used in the description of the present embodiment are omitted.
In the present embodiment, since the motor portion is built in the bearing housing 6, the heat sink 21 can be disposed on the end surface on the side opposite to the impeller of the bearing housing 6. In this embodiment, the outside of the sealing flange 9 attached to the end surface on the side opposite to the impeller of the bearing box 6 is provided and the heat sink 21 is provided via the sealing flange 9. If the structure is adopted, the heat sink 21 can be disposed directly on the end surface on the side opposite to the impeller of the bearing housing 6.
On the other hand, in the case of the high-temperature gas blowing fan of Patent Document 1, since the motor part is externally attached and the heat sink cannot be directly attached to the end of the bearing box, the amount of heat transferred to the bearing box using a heat pipe Had to be transported by heat to a heat sink located away from the fan body. Compared with Patent Document 1, this embodiment eliminates the need for brazing work for joining the heat pipe, the hole for embedding the heat pipe provided in the bearing box, and the bearing box and the heat pipe, which is very advantageous in terms of cost.

  FIG. 4 is a front view of the heat sink 21 (right side view of FIG. 3). In the figure, reference numeral 22 denotes a heat radiation pin provided so as to protrude from the outer surface of the heat sink 21 (the opposite side surface of the sealing flange 9). In this embodiment, the heat sink 21 composed of a large number of pins 22 is adopted. However, the heat sink is not limited to the pin type, and a type in which fins are stacked, a type in which pins and fins are combined, and the like are also effective.

FIG. 5 is a side sectional view of a high temperature gas blowing fan showing a third embodiment of the present invention. In the figure, 9 is a sealing flange, 12 is a stator connection cable, 13 is a sensor connection cable, 17 is a seal packing, 18 is a cable lead-out hole, and 23 is a cable sealing material. The same parts as those in FIG. 1 that are not used in the description of the present embodiment are omitted.
In this embodiment, since the motor portion is built in the bearing housing 6, it is necessary to take out the stator connection cable 12, the sensor connection cable 13, and the like to the outside. In order to prevent the high temperature gas from leaking from the fan, it is necessary to perform gas sealing in the route for drawing the cable to the outside.
In this embodiment, in the cable lead-out hole 18 provided in the sealing flange 9, the gap between the cable and the inner peripheral portion of the lead-out hole 18, including the gap between the plurality of cables, is formed as an adhesive, for example. Leakage of hot gas to the outside of the fan system can be completely fixed by tightly fixing with an object that shares good sealing properties and adhesiveness.
The contact surface between the casing 16 and the sealing flange 9 is gas sealed with a seal packing 17.
As described above, in this embodiment, a complete gas tight structure can be obtained without using a shaft seal device such as a gland packing, although it is a rotating machine.

FIG. 6 shows another sealing method for the cable lead-out hole 18. Reference numeral 12 denotes a stator connection cable, 13 denotes a sensor connection cable, 23 denotes a cable sealing material, 24 denotes a sealing collar, and 25 denotes an O-ring. According to this embodiment, the cables are closely fixed with each other using the cable sealing material 23 as described above, but the sealing collar 24 is disposed between the cable drawing holes and the sealing performance is not impaired. It becomes possible to improve workability at the time of removal. In FIG. 5 and FIG. 6, the cable lead hole 18 provided in the sealing flange is directly sealed, but a pipe is connected to the hole and the cable is inserted into the pipe. You may seal by the method similar to the above.
In this embodiment, the cables are collectively taken out from the cable lead-out hole 18 provided in the sealing flange 9, but the cable lead-out holes 18 may be provided separately at a plurality of locations.

FIG. 7 is an enlarged sectional view of a motor portion showing a fourth embodiment of the present invention. In the figure, 6 is a bearing box, 7 is a rotor, 8 is a stator, 18 is a cable drawing hole, 26 is an airtight partition, and 27 is an O-ring. The same parts as those in FIG. 1 that are not used in the description of the present embodiment are omitted.
As shown in FIG. 7, a cup-shaped airtight partition wall 26 is disposed in an airtight manner with respect to the bearing housing 6 by, for example, an O-ring 27 between the rotor 7 and the stator 8 constituting the motor built in the bearing housing 6. By accommodating the rotor 7 in the interior surrounded by the airtight partition wall 26, it is possible to seal the high temperature gas at the airtight partition wall 26 portion without performing sealing work at the cable drawing hole 18. The material of the airtight partition wall 26 is preferably non-magnetic and non-conductive in order to prevent deterioration in motor performance. In this example, a resin-made airtight partition was used.

FIG. 8 is a side sectional view of a hot gas blowing fan in which the first, second and third embodiments of the present invention are combined at the same time. In the figure, 6 is a bearing box, 17 is a seal packing, 18 is a cable drawing hole, 21 is a heat sink, and 23 is a cable sealing material. The same parts as those in FIG. 1 that are not used in the description of the present embodiment are omitted.
In this embodiment, there are two seal points for the high-temperature gas, that is, 17 parts for the seal packing and 23 parts for the cable sealing material. Since both of these seals are seals between stationary objects, the high-temperature gas is surely leaked to the outside. In addition, it can be easily prevented. Sealing of rotating machinery is usually carried out by shaft sealing devices such as gland packing and oil seals, but these shaft sealing devices have long-term reliability, such as the occurrence of clearance from the shaft due to sliding wear with the rotating shaft. It is virtually impossible to achieve a complete gastight structure. Since solid oxide fuel cells often operate in environments where there are people around, such as ordinary homes, apartment houses, and stores, the fact that a completely gastight structure can be realized as in this embodiment is also very safe from the standpoint of safety. is important. Further, since the seal of this embodiment is a simple and inexpensive method, it has an advantage in terms of mass production cost.

Moreover, since the heat sink 21 is arrange | positioned at the anti-impeller side edge part of the bearing case 6, the bearing temperature in blowing high temperature gas can be cooled effectively. The dew point of the high temperature fuel gas used in the solid oxide fuel cell is about 70 ° C. When the cooling by the heat sink 21 is excessively performed, the temperature of the bearing box becomes lower than the above dew point, and there is a problem that condensed water is accumulated in the bearing box or rust is generated in the bearing. In the present embodiment, by adjusting the flow rate of the cooling air blown to the heat sink 21, it is possible to easily maintain the bearing temperature in an intermediate range between the dew point and the bearing heat resistance temperature.
In the solid oxide fuel cell system, there is an air blower for supplying air to the air electrode of the battery. Therefore, it is easy to divert the air from the air blower to the cooling air. When piping from the air blower to the heat sink 21 is difficult, a method of directly attaching a cooling fan to the heat sink is also effective.
When the high-temperature gas blowing fan according to this example is used in an actual solid oxide fuel cell, the bearing temperature can be maintained at 82 ° C. under the conditions of a high-temperature fuel gas temperature of 950 ° C. and a cooling air temperature of 20 ° C. did it.

  The high-temperature gas blowing fan according to the present embodiment is technically and technically equivalent to the high-temperature gas blowing fan disclosed in Patent Document 1, but is smaller in shape or structure than the fan disclosed in Patent Document 1. And the parts configuration becomes very simple. Specifically, the heat pipe, a pair of magnetic couplings, the motor shaft, two motor bearings, and the motor case have been deleted, and it is extremely expensive in terms of mass production cost required for solid oxide fuel cell applications. Is advantageous.

  The compacted high-temperature gas blowing fan of the present invention is particularly suitable for a solid oxide fuel cell, but a fuel cell other than a solid oxide type (for example, a molten carbonate fuel cell) and others. It is also useful as a fan for supplying hot gas without leaking it.

  The high-temperature gas blowing fan of the present invention has a simple and inexpensive sealing structure, so that it is particularly for high-temperature fuel gas recirculation such as solid oxide fuel cells used in ordinary homes, apartment houses, stores, etc. It is suitable as a fan.

1 is a side cross-sectional view of a hot gas blowing fan showing a first embodiment of the present invention. The front view of the fan for hot gas ventilation of FIG. 1 (left side view of FIG. 1). Side surface sectional drawing of the fan for hot gas ventilation which shows the 2nd Example of this invention. The front view of the heat pipe of the fan for hot gas blowing shown in FIG. 3 (right side view of FIG. 3). Side surface sectional drawing of the fan for hot gas blowing which shows the 3rd Example of this invention. FIG. 6 is a local side sectional view showing another embodiment of the hot gas blowing fan of FIG. 5. The local side sectional drawing of the fan for hot gas blowing which shows the 4th Example of this invention. Side surface sectional drawing of the fan for hot gas blowing which shows embodiment which combined the 1st, 2nd, 3rd Example of this invention.

Explanation of symbols

1: rotating shaft 2: impeller 3: impeller side bearing 4: anti-impeller side bearing 5: heat insulating block 6: bearing box 7: rotor 8: stator 9: sealing flange 10: rotation control sensor 11: rotation control magnet 12 : Stator connection cable 13: Sensor connection cable 14: Suction port 15: Outlet port 16: Casing 17: Sealing packing 18: Cable lead hole 19: Heat insulation layer 20: Heat insulation block fixing plate 21: Heat sink 22: Pin 23: For cable Seal material 24: Sealing collar 25: O-ring 26: Airtight partition wall 27: O-ring

Claims (4)

A heat-resistant impeller that is cantilevered on the rotating shaft, a heat-conductive bearing box that supports the bearing of the rotating shaft, and a heat insulating block that is disposed between the impeller and the bearing box. A fan for blowing hot gas,
The rotor of the motor is disposed at the shaft end opposite to the impeller of the rotating shaft by cantilever support in the bearing housing, and the stator of the motor disposed in a non-contact state with the rotor on the outer periphery of the rotor A bearing flange is supported and fixed to the inner peripheral portion of the bearing box, and a sealing flange is disposed at an end of the bearing box opposite to the impeller, and a bearing box cooling heat sink is directly or via the sealing flange. A fan for blowing high-temperature fuel gas in a solid oxide fuel cell, wherein the fan is provided. The sealing flange are holes arranged for guiding a power line of the motor and / or a cable for signal line to the outside, the seal anchor the gap between the inner peripheral portion of the said cable bore The high-temperature fuel gas blowing fan of the solid oxide fuel cell according to claim 1, wherein the high-temperature gas blown by the rotation of the impeller is sealed off from the outside . The non-magnetic and non-conductive hermetic partition wall is disposed in an airtight manner with respect to the bearing box in a radial gap between the rotor and the stator, and the rotor is provided in the hermetic partition wall. Or a fan for blowing high-temperature fuel gas in the solid oxide fuel cell according to 2 ; 4. The fan for blowing high-temperature fuel gas in a solid oxide fuel cell according to claim 3, wherein the airtight partition is made of resin .

Images