KR100962304B1 - Gas supplying apparatus for fuel cell - Google Patents

Abstract

A gas supply device for a fuel cell is disclosed. The present invention includes a housing; a drive motor installed in the housing; and a rotating shaft rotatably coupled to the driving motor; and rotatably coupled to an end of the rotating shaft, thereby compressing the gas supplied from the housing. An impeller; and a bearing unit installed on the rotating shaft; and a high temperature gas passing through the driving motor and the bearing to be installed in the housing to cool a portion in which the driving motor and the bearing are installed during the high speed rotation of the rotating shaft. And cooling means in communication with the impeller portion for compressing from the air, and each cooling passage portion is formed in the portion in which the driving motor is installed and in the rotating shaft portion in which the bearing is interposed. As it passes through, it cools the heat generated by the drive motor and bearing. As a result, the heat generated from them can be quickly cooled during operation without any cooling means.

Description

Gas supplying apparatus for fuel cell

1 is a schematic view showing a gas supply device according to an embodiment of the present invention.

<Brief description of symbols for the main parts of the drawings>

10 Gas supply unit 11 Housing

12 ... drive motor 13 ... rotation shaft

14 Impeller 15 Bearing part

16 ... Cooling fan 21 ... First cooling passage

21a ... first cooling inlet 21b ... first cooling inlet

22 ... second cooling passage 22a ... second cooling inlet

22b ... Passage 22c ... Second cooling vent

The present invention relates to a gas supply device, and more particularly, to a fuel supply gas supply device having an improved structure to cool a driving motor and a bearing without a separate cooling device.

Typically, a fuel cell is a type of battery that uses electrical energy generated during a chemical bond reaction between hydrogen and oxygen, and may be referred to as an electrochemical engine because energy is converted by an electrochemical reaction. Unlike electric cars using fuel cells, cars using fuel cell engines are convenient to use like internal combustion engine cars because they can continue to run when fuel is supplied, especially when using hydrogen directly as fuel. There is an advantage that can be achieved.

In addition, the energy conversion efficiency of the fuel cell is theoretically 80%, which is higher than that of the internal combustion engine that is less than 30%, and overcomes disadvantages such as short working distance and long charging time of the electric vehicle. It is proposed as a solution to solve the exhaust gas emission problem generated by hybrid electric vehicles using an internal combustion engine.

On the other hand, a turbo compressor serves to deliver high pressure air to the required equipment by compressing the outside air at high pressure. An example of the application of a turbo compressor is a gas turbine, which compresses air into a compressor and sends it to a combustor, mixes fuel with ignition and burns it to produce a high-temperature, high-pressure combustion gas. It is a prime mover that drives the turbine to get output. Here, the effective output is the difference between the turbine generating power and the compressor driving power, which is used as a shaft output for driving power plants, automobiles, and the like.

Such turbo compressors are applicable to automobiles using fuel cells. By the way, a conventional turbo compressor is applied to a separate cooling means in order to quickly cool the high heat generated from the drive motor or the bearing rotating at high speed.

That is, a separate cooling passage is formed to supply oil or water through the passage to cool the driving motor or the bearing. The installation of the cooling means further complicates the structure of the turbo compressor. In addition, there is a disadvantage that the manufacturing cost is increased because the device for supplying oil or water should be installed.

The present invention is to solve the above problems, improve the structure to cool the inlet by supplying a relatively low temperature external gas to the drive motor and the bearing to provide a fuel cell gas supply device that does not require the installation of a separate cooling means The purpose is to provide.

In order to achieve the above object, a gas supply device for a fuel cell according to an aspect of the present invention,

A housing part;

A drive motor installed in the housing part;

A rotating shaft rotatably coupled to the drive motor;

An impeller rotatably coupled to an end of the rotating shaft and compressing a gas supplied from the housing part;

A bearing unit provided on the rotating shaft; And

It is installed in the housing part to cool the portion in which the drive motor and the bearing is installed during the high-speed rotation of the rotary shaft, the hot gas passing through the drive motor and the bearing is in communication with the impeller portion to compress from the impeller Cooling means; characterized in that it comprises a.

The cooling means may be formed in a portion corresponding to a portion in which the driving motor is installed to form a first cooling passage portion for cooling the driving motor, and a lower end portion of the bearing and the driving motor in the rotating shaft portion in which the bearing is installed. And a second cooling passage for cooling.

In addition, the first cooling passage portion has a first cooling inlet hole provided in the housing portion, the inside of the housing portion corresponding to the drive motor, and a first cooling discharge hole communicating with the impeller.

Further, the second cooling passage portion includes a second cooling inlet hole provided in the housing portion, a passage formed in a portion in which the bearing portion is provided, and a second cooling discharge hole communicating with the impeller.

Furthermore, a cooling fan is installed on the outer wall of the housing part corresponding to the part in which the driving motor is installed to increase the heat dissipation area.

Hereinafter, a gas supply device for a fuel cell according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 shows a gas supply apparatus 10 for a fuel cell according to the present invention.

Referring to the drawings, the gas supply device 10 is provided with a housing portion 11. The drive motor 12 is provided inside the housing part 11. The drive motor 12 is rotatably provided with a rotary shaft 13 which is rotated by receiving power from the drive motor 12.

At the end of the rotating shaft 13, an impeller 14 is installed which compresses the gas sucked by rotating at the same time. The impeller 14 is formed with a blade 14a having a plurality of curved surfaces, and communicates with a diffuser (not shown).

In addition, a bearing portion 15, for example, an air foil bearing, is provided on the rotary shaft 13 to smooth its rotational motion. As is well known, the air foil bearing is used to radially support the rotating shaft 13 which can be rotated at high speed, and is provided so that the foils having elastic force overlap each other. It has a streamlined shape, in which the edge portion of the foil is in contact with the outer surface of the adjacent foil, and the radius of curvature of the foil decreases toward the edge portion.

At this time, a cooling means is formed inside the housing part 11. The cooling means is a cooling passage portion formed along the interior of the housing portion 11, at least one of which is formed.

The cooling means may include a first cooling passage 21 in which some of the external gas including the air introduced therein does not pass through the bearing 15, and the gas introduced from the outside is bearing. And a second cooling passage portion 22 flowing out through the portion 15.

That is, the first cooling inlet hole 21a is formed in the first cooling passage part 21. The first cooling inlet hole 21a communicates with an interior 11b of the housing part 11 in which the drive motor 12 is installed. The interior 11b of the housing part 11 communicates with the first cooling discharge hole 21b, and cooling air discharged through the cooling discharge hole 21b can be supplied to the impeller 14.

Accordingly, the first cooling passage part 21 moves the driving motor 12 while the gas introduced from the first cooling inlet hole 21a flows along the interior 11b in which the driving motor 12 is installed. It cools, and is again discharged through the 1st cooling discharge hole 21b, and forms the cooling path | route supplied to the impeller 14. As shown in FIG.

The second cooling inlet hole 22a is formed in the second cooling passage part 22. The second cooling inlet hole 22a may include a passage 22b between the inner portion 11b of the housing part 11 and the rotation shaft 13 to cool the bearing portion 15 interposed on the rotation shaft 13. In communication. The passage 22b can supply cooling air to the impeller 14 through the second cooling discharge hole 22c.

As a result, the second cooling passage portion 22 flows along the passage 22b in which the gas introduced from the second cooling inlet hole 22a flows along the bearing portion 15, and the driving motor and the driving motor. The cooling path 12 is cooled and discharged through the second cooling discharge hole 22c to form a cooling path supplied to the impeller 14.

On the other hand, an outer wall of the housing part 11, for example, a portion corresponding to the portion where the driving motor 12 is installed, increases the heat dissipation area in order to quickly discharge heat generated when the driving motor 12 is driven. Additional cooling fans 16 may be installed.

Looking at the action of the cooling means of the gas supply device 10 according to the present invention having the configuration as described above are as follows.

First, when the rotary shaft 13 is rotated by the drive motor 12, the impeller 14 coupled to the end of the rotary shaft 13 is rotated at a high speed. When the impeller 14 rotates at a high speed, high heat is generated in the driving motor 12 and the bearing part 15.

At this time, in order to cool the heat generated from the driving motor 12 and the bearing portion 15, a gas containing relatively low temperature air is supplied from the cooling means.

That is, the gas introduced from the first cooling inlet hole 21a cools the driving motor 12 while passing through the interior 11b of the housing part 11 in which the driving motor 12 is installed. The hot gas heated while cooling the driving motor 12 is supplied to the impeller 14 while being discharged through the first cooling discharge hole 21b. The air discharged to the impeller 14 may be discharged through the diffuser while being compressed by the high speed rotation of the blade 14a.

At the same time, the gas introduced from the second air cooling inlet 22a passes through the passage 22b provided with the bearing portion 15 interposed between the inner portion 11b of the housing portion 11 and the rotary shaft 13. Cooling the bearing portion 15 while passing through.

At this time, the cooling wind passing through the bearing portion 15 provided on both sides of the rotary shaft 13 flows back into the bearing portion 15 via the lower end of the driving motor 12 located therebetween. 2 is supplied to the impeller 14 while being discharged through the cooling discharge hole (22c). The air discharged to the impeller 14 may be discharged through the diffuser while being compressed by the high speed rotation of the blade 14a.

At this time, the bearing portion 15 is preferably provided with an air foil bearing in order to smooth the rotation of the rotary shaft (13). The air foil bearing is provided in the radial direction with respect to the axial direction of the rotating shaft 13.

Therefore, when the rotary shaft 13 rotates, the air foil bearing is elastically deformed to be spaced apart from the rotary shaft 13 due to the high pressure gas flowing into the passage 22b between the air foil bearing and the outer peripheral surface of the rotary shaft 13. Thus, it will be said that the rotating shaft 13 is floatable from the air foil bearing.

On the other hand, since the cooling fan 16 is provided in the outer wall of the housing part 11 corresponding to the part in which the said drive motor 12 was installed, the heat which generate | occur | produced can be discharged | emitted to outside quickly.

In the fuel cell gas supply apparatus of the present invention as described above, since each cooling passage portion is formed in a portion in which a driving motor is installed and a rotating shaft portion in which a bearing is interposed, a gas containing relatively low temperature air is driven while passing therethrough. It cools the heat generated from the motor and the bearing. As a result, the heat generated from them can be quickly cooled during operation without any cooling means.                     

Second, the hot gas heated through the rotating shaft portion interposed between the driving motor and the bearing can be supplied to the diffuser while being compressed by an impeller coupled to the end of the rotating shaft to rotate at high speed, thereby greatly simplifying the structure.

Third, since the cooling fan is provided in the housing part corresponding to the part in which the drive motor is installed, the heat dissipation area can be further expanded.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (6)

A housing part; A drive motor installed in the housing part; A rotating shaft rotatably coupled to the drive motor; An impeller rotatably coupled to an end of the rotating shaft and compressing a gas supplied from the housing part; A bearing unit provided on the rotating shaft; And Cooling in communication with the impeller portion is installed in the housing to cool the portion in which the drive motor and the bearing is installed during the high-speed rotation of the rotary shaft, the high temperature gas passing through the drive motor and the bearing from the impeller Gas supply device for a fuel cell comprising a; means. The method of claim 1, The cooling means is formed in a portion corresponding to the portion in which the drive motor is installed, the first cooling passage portion for cooling the drive motor, and formed in the rotating shaft portion in which the bearing is installed to cool the lower end of the bearing and the drive motor. A gas supply device for a fuel cell, comprising a second cooling passage. The method of claim 2, The first cooling passage part includes a first cooling inlet hole provided in the housing part, an interior of the housing part corresponding to the driving motor, and a first cooling discharge hole communicating with the impeller. Device. The method of claim 2, And the second cooling passage portion includes a second cooling inlet hole provided in the housing portion, a passage formed in a portion in which the bearing portion is provided, and a second cooling discharge hole communicating with the impeller. The method of claim 1, And said bearing member is an air foil bearing. The method of claim 1, And a cooling fan is installed on an outer wall of the housing part corresponding to the portion in which the driving motor is installed, in order to enlarge a heat dissipation area.

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