阅读说明：本技术 一种绝缘密封装置及燃料电池堆 (Insulating sealing device and fuel cell stack ) 是由 程健 张瑞云 许世森 卢成壮 白发琪 于 2021-08-27 设计创作，主要内容包括：本发明涉及燃料电池技术领域,提供一种绝缘密封装置及燃料电池堆,该绝缘密封装置,至少包括：第一法兰,一面设置有第一连接管,适于与电池堆相连；第二法兰,一面设置有第二连接管,适于与外部金属管道相连；云母垫圈,夹设在所述第一法兰与所述第二法兰之间；其中,所述第一连接管与所述第二连接管相互背对设置。该绝缘密封装置,在第一法兰上设置有第一连接管,在第二法兰上设置有第二连接管,利用第一连接管与第二连接管将电池堆与外部的金属管道连接起来,同时,用云母垫圈将第一法兰与第二法兰隔开,在保证连接功能的前提下,使电池堆与金属管道之间处于绝缘状态,有利于提高燃料电池发电系统的安全性,降低触电等安全事故的发生率。(The invention relates to the technical field of fuel cells, and provides an insulating sealing device and a fuel cell stack, wherein the insulating sealing device at least comprises: a first flange, one side of which is provided with a first connecting pipe suitable for being connected with the cell stack; one side of the second flange is provided with a second connecting pipe which is suitable for being connected with an external metal pipeline; a mica washer sandwiched between the first flange and the second flange; wherein the first connecting pipe and the second connecting pipe are arranged back to back. This insulating sealing device is provided with first connecting pipe on first flange, be provided with the second connecting pipe on the second flange, utilize first connecting pipe and second connecting pipe to get up the pile with outside metal pipeline, simultaneously, separate first flange and second flange with the mica packing ring, under the prerequisite of guaranteeing connection function, make and be in insulating state between pile and the metal pipeline, be favorable to improving fuel cell power generation system's security, reduce the incidence of incident such as electrocution.)

1. An insulating and sealing device, characterized in that it comprises at least:

a first flange, one side of which is provided with a first connecting pipe suitable for being connected with the cell stack;

one side of the second flange is provided with a second connecting pipe which is suitable for being connected with an external metal pipeline;

a mica washer sandwiched between the first flange and the second flange;

wherein the first connecting pipe and the second connecting pipe are arranged back to back.

2. The insulation sealing arrangement of claim 1,

the ceramic sealing gasket comprises a ceramic insulating gasket, a first sealing gasket and a second sealing gasket;

the ceramic insulating pad is embedded in the inner ring of the mica gasket;

the first sealing gasket is clamped between the ceramic insulating gasket and the first flange;

the second sealing gasket is clamped between the ceramic insulating gasket and the second flange;

the ceramic insulating pad, the first sealing pad and the second sealing pad are all provided with through holes to communicate the first connecting pipe with the second connecting pipe.

3. The insulation sealing arrangement of claim 2,

one surface, facing the ceramic insulating pad, of the first flange is provided with a first groove, and at least one part of the first sealing pad is embedded in the first groove;

and a second groove is formed in one surface, facing the ceramic insulating pad, of the second flange, and at least one part of the second sealing pad is embedded in the second groove.

4. The insulation sealing arrangement of claim 1,

the double-head screw rod is connected with the first ceramic sleeve;

the first flange, the second flange and the mica washer are all provided with mounting holes, and the double-end screw penetrates through the first flange, the mica washer and the second flange in sequence;

the first ceramic sleeve is arranged in a mounting hole on the first flange, and the double-headed screw is inserted into the first ceramic sleeve;

the second ceramic sleeve is arranged in a mounting hole in the second flange, and the double-headed screw is inserted into the second ceramic sleeve.

5. The insulation sealing arrangement of claim 4,

four mounting holes are uniformly arranged at intervals along the circumferential direction of the first flange.

6. The insulation sealing arrangement of claim 4,

one end of the double-end screw is locked by a first nut, a first elastic cushion and a first flat cushion are sleeved between the first nut and the first flange, and the first elastic cushion is positioned between the first nut and the first flat cushion;

the other end of the double-end screw is locked by a second nut, the second nut is sleeved with a second elastic cushion and a second flat cushion between the second flanges, wherein the second elastic cushion is located between the second nut and the second flat cushion.

7. The insulation sealing arrangement of claim 6,

the mica ring comprises a first mica ring and a second mica ring;

the first mica ring is disposed between the first flat gasket and the first flange;

the second mica ring is disposed between the second flat gasket and the second flange.

8. The insulation sealing arrangement of claim 2,

the first sealing gasket and the second sealing gasket are made of graphite materials.

9. The insulation sealing arrangement of claim 2,

the thickness range of the mica gasket is 2 mm-4 mm;

the thickness of the ceramic insulating pad is not less than 5 mm.

10. A fuel cell stack comprising the insulating and sealing device of any one of claims 1 to 9.

Technical Field

The invention relates to the technical field of fuel cells, in particular to an insulating sealing device and a fuel cell stack.

Background

The Molten Carbonate Fuel Cell (MCFC) is a high-temperature Fuel Cell working at 650 ℃, has the advantages of no need of noble metal as a catalyst, wide Fuel source, low noise, nearly zero emission of pollutants, high power generation efficiency, realization of combined heat and power supply and the like, is suitable for distributed power stations or fixed power stations of hundreds of kilowatts to megawatts, and has good development prospect.

The basic unit of the molten carbonate fuel cell stack consists of a cathode end plate, an electrolyte, a cathode, an anode and an anode end plate, wherein electric energy generated by the working state of the fuel cell stack is generally led out by the cathode end plate and the anode end plate, the cathode end plate and the anode end plate are generally connected with metal gas inlet and tail gas pipelines, and if the cell stack is not insulated and disconnected with the connected metal pipelines, the generated strong current can be conducted to various auxiliary equipment along the metal pipelines, so that the safety of a fuel cell power generation system is greatly influenced, and even safety accidents such as electric shock and the like occur. Therefore, how to improve the insulation between the cell stack and the external metal pipe is a problem to be solved urgently.

Disclosure of Invention

Therefore, the present invention is directed to overcome the problem of poor insulation between a cell stack and an external metal pipe in the prior art, and to provide an insulating sealing device and a fuel cell stack.

In order to solve the technical problems, the technical scheme of the invention is as follows:

the invention provides an insulating and sealing device, at least comprising: a first flange, one side of which is provided with a first connecting pipe suitable for being connected with the cell stack; one side of the second flange is provided with a second connecting pipe which is suitable for being connected with an external metal pipeline; a mica washer sandwiched between the first flange and the second flange; wherein the first connecting pipe and the second connecting pipe are arranged back to back.

Further, the insulating and sealing device also comprises a ceramic insulating gasket, a first sealing gasket and a second sealing gasket; the ceramic insulating pad is embedded in the inner ring of the mica gasket; the first sealing gasket is clamped between the ceramic insulating gasket and the first flange; the second sealing gasket is clamped between the ceramic insulating gasket and the second flange; the ceramic insulating pad, the first sealing pad and the second sealing pad are all provided with through holes to communicate the first connecting pipe with the second connecting pipe.

Furthermore, a first groove is formed in one surface, facing the ceramic insulating pad, of the first flange, and at least one part of the first sealing pad is embedded in the first groove; and a second groove is formed in one surface, facing the ceramic insulating pad, of the second flange, and at least one part of the second sealing pad is embedded in the second groove.

Further, the insulation sealing device also comprises a double-end screw, a first ceramic sleeve and a second ceramic sleeve; the first flange, the second flange and the mica washer are all provided with mounting holes, and the double-end screw penetrates through the first flange, the mica washer and the second flange in sequence; the first ceramic sleeve is arranged in a mounting hole on the first flange, and the double-headed screw is inserted into the first ceramic sleeve; the second ceramic sleeve is arranged in a mounting hole in the second flange, and the double-headed screw is inserted into the second ceramic sleeve.

Further, four mounting holes are uniformly arranged at intervals along the circumferential direction of the first flange.

Furthermore, one end of the double-end screw is locked by a first nut, a first elastic cushion and a first flat cushion are sleeved between the first nut and the first flange, and the first elastic cushion is positioned between the first nut and the first flat cushion; the other end of the double-end screw is locked by a second nut, the second nut is sleeved with a second elastic cushion and a second flat cushion between the second flanges, wherein the second elastic cushion is located between the second nut and the second flat cushion.

Further, the insulation sealing device also comprises a first mica ring and a second mica ring; the first mica ring is disposed between the first flat gasket and the first flange; the second mica ring is disposed between the second flat gasket and the second flange.

Further, the first sealing gasket and the second sealing gasket are made of graphite materials.

Further, the mica washer has a thickness ranging from 2mm to 4 mm; the thickness of the ceramic insulating pad is not less than 5 mm.

The invention also provides a fuel cell stack which comprises the insulating sealing device.

The technical scheme of the invention has the following advantages:

according to the insulation sealing device provided by the invention, the first connecting pipe is arranged on the first flange, the second connecting pipe is arranged on the second flange, the cell stack is connected with an external metal pipeline by using the first connecting pipe and the second connecting pipe, and meanwhile, the first flange and the second flange are separated by using the mica gasket, so that the cell stack and the metal pipeline are in an insulation state on the premise of ensuring the connection function, the safety of a fuel cell power generation system is favorably improved, and the occurrence rate of safety accidents such as electric shock is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is an exploded view of an insulation sealing arrangement in an embodiment of the invention;

fig. 2 is a schematic view of a double-headed screw in the insulation sealing device according to the embodiment of the invention.

Description of reference numerals:

1. a first flange; 2. A mica washer; 3. A second flange;

4. a ceramic insulating pad; 5. A first gasket; 6. A second gasket;

7. a first ceramic bushing; 8. A second ceramic bushing; 9. A double-ended screw;

10. a first nut; 11. A second nut; 12. A first spring washer;

13. a second spring pad; 14. A first flat pad; 15. A second flat pad;

16. a first mica ring; 17. A second mica ring.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

FIG. 1 is an exploded view of an insulation sealing arrangement in an embodiment of the invention; as shown in fig. 1, the present embodiment provides an insulation sealing device, which at least includes: a first flange 1, one side of which is provided with a first connecting pipe and is suitable for being connected with a cell stack; one side of the second flange 3 is provided with a second connecting pipe which is suitable for being connected with an external metal pipeline; the mica gasket 2 is clamped between the first flange 1 and the second flange 3; wherein, the first connecting pipe and the second connecting pipe are arranged back to back.

Specifically, the first flange 1 and the second flange 3 may be planar flanges having a circular disc structure, the first connecting pipe may be welded to one surface of the first flange 1, and a through hole may be formed in the center of the first flange 1, and the through hole is aligned with the first connecting pipe. Likewise, the second flange 3 may be provided. Wherein the size of the mica washer 2 can be kept the same as the size of the first flange 1, and the thickness of the mica washer 2 is in the range of 2 mm-4 mm, for example, 2 mm. In use, the mica washer 2, the first flange 1 and the second flange 3 may be arranged coaxially.

According to the insulation sealing device provided by the invention, the first connecting pipe is arranged on the first flange 1, the second connecting pipe is arranged on the second flange 3, the cell stack is connected with an external metal pipeline by using the first connecting pipe and the second connecting pipe, and meanwhile, the first flange 1 is separated from the second flange 3 by using the mica gasket 2, so that the cell stack and the metal pipeline are in an insulation state on the premise of ensuring the connection function, the safety of a fuel cell power generation system is favorably improved, and the occurrence rate of safety accidents such as electric shock is reduced.

In this embodiment, the insulating and sealing device further includes a ceramic insulating gasket 4, a first sealing gasket 5, and a second sealing gasket 6; the ceramic insulating pad 4 is embedded in the inner ring of the mica gasket 2; wherein the thickness of the ceramic insulating pad 4 is not less than 5mm, for example, the thickness of the ceramic insulating pad 4 may be 5 mm. The outer diameter of the ceramic insulating pad 4 can be 1mm smaller than the diameter of the inner ring of the mica gasket 2, and a through hole is formed in the center of the ceramic insulating pad 4.

Wherein, the first sealing gasket 5 is clamped between the ceramic insulating gasket 4 and the first flange 1; the second gasket 6 is sandwiched between the ceramic insulating mat 4 and the second flange 3. For example, the first gasket 5 and the second gasket 6 may be made of graphite, and can resist a high temperature of 800 ℃. For example, the thickness of each of the first seal 5 and the second seal 6 may be 2 mm.

Wherein, all be provided with the via hole on ceramic insulating pad 4, first sealed 5 and the sealed 6 of second of filling up to communicate first connecting pipe and second connecting pipe. Wherein, the ceramic insulating pad 4 is arranged to improve the insulation between the first flange 1 and the second flange 3.

In this embodiment, a first groove is formed in a surface, facing the ceramic insulating pad 4, of the first flange 1, wherein a depth range of the first groove may be 3mm to 4mm, wherein high temperature resistant glue may be applied to the first groove, and then the first sealing gasket 5 is bonded to the first groove.

In a similar way, a second groove is formed in one surface, facing the ceramic insulating pad 4, of the second flange 3, wherein the depth range of the second groove can be 3 mm-4 mm, high-temperature-resistant glue can be smeared in the second groove, and then the second sealing pad 6 is bonded in the second groove. The first gasket 5 and the second gasket 6 are arranged to improve the sealing performance between the first flange 1 and the second flange 3.

Fig. 2 is a schematic diagram of a double-threaded screw in an insulation sealing device according to an embodiment of the present invention, as shown in fig. 2, in this embodiment, in order to make the connection between the first flange 1 and the second flange 3 more tight and reliable, the double-threaded screw 9 may be used to connect the two.

Wherein, all be provided with the mounting hole on first flange 1, second flange 3 and the mica packing ring 2, double-end screw 9 passes first flange 1, mica packing ring 2 and second flange 3 in proper order.

Afterwards, one end of the double-end screw 9 is locked by a first nut 10, a first elastic cushion 12 and a first flat cushion 14 are sleeved between the first nut 10 and the first flange 1, wherein the first elastic cushion 12 is located between the first nut 10 and the first flat cushion 14.

The other end of the double-end screw 9 is locked by a second nut 11, a second elastic cushion 13 and a second flat cushion 15 are sleeved between the second nut 11 and the second flange 3, wherein the second elastic cushion 13 is positioned between the second nut 11 and the second flat cushion 15. So set up, can make first flange 1 and second flange 3 be connected inseparabler, be favorable to improving the leakproofness.

In order to improve the insulation between the double-headed screw 9 and the first flange 1 and the second flange 3, a first ceramic sleeve 7 can be inserted into the mounting hole on the first flange 1, and the double-headed screw 9 is inserted into the first ceramic sleeve 7; a second ceramic bushing 8 can be inserted in the mounting hole on the second flange 3, and a double-headed screw 9 can be inserted in the second ceramic bushing 8. The diameter of the first ceramic sleeve 7 is slightly smaller than that of the mounting hole in the first flange 1, and the diameter of the first ceramic sleeve 7 is slightly larger than that of the mounting hole in the mica gasket 2. Similarly, the diameter of the second ceramic sleeve 8 is slightly smaller than that of the mounting hole on the second flange 3, and the diameter of the second ceramic sleeve 8 is slightly larger than that of the mounting hole on the mica gasket 2.

In this embodiment, can set up the figure of double threaded screw 9 as required, for example the figure of double threaded screw 9 can be four, and is corresponding, sets up four mounting holes along the even interval in circumference of first flange 1, sets up four mounting holes along the even interval in circumference of second flange 3, sets up four mounting holes along the even interval in circumference of mica packing ring 2. So set up, can make first flange 1 and second flange 3 be connected inseparabler, be favorable to improving the leakproofness.

In this embodiment, in order to improve the insulation between the double-headed screw 9 and the first and second flanges 1 and 3, a first mica ring 16 may be disposed between the first flat gasket 14 and the first flange 1; a second mica ring 17 may be arranged between the second gasket 15 and the second flange 3.

When in use, the sealing can be carried out according to the following method:

step 1, uniformly coating a layer of high-temperature-resistant glue in a first groove, and placing a first sealing gasket with the same size as the first groove on the high-temperature-resistant glue; uniformly coating a layer of high-temperature-resistant glue in the second groove, and placing a second sealing gasket with the same size as the second groove on the high-temperature-resistant glue;

step 2, placing a ceramic insulating pad on the first sealing pad;

step 3, placing a mica gasket on the ceramic insulating gasket, wherein the diameter of an inner ring of the mica gasket is 1mm larger than the outer diameter of the first sealing gasket, and the outer diameter of the mica gasket is the same as that of the first flange;

step 4, aligning the second flange back buckles with all mounting holes on the first flange, placing a first ceramic bushing in each mounting hole on the first flange, placing a second ceramic bushing in each mounting hole on the second flange, inserting a double-end screw for connection, and screwing a nut to finish sealing insulation;

and 5, welding the first connecting pipe with any air inlet and outlet of the cell stack, and welding the second connecting pipe with an air inlet and outlet metal pipeline of the cell to finish the insulation of the cell stack and the metal pipeline.

In summary, after the molten carbonate fuel cell stack and the gas inlet and outlet metal pipelines adopt the insulating sealing device, the insulation and sealing of all the gas inlet and outlet metal pipelines of the cell stack at the high temperature of 650-750 ℃ can be realized, the risk of electric leakage and electrification of the metal pipelines connected with the cell stack is eliminated, and the safety of the fuel cell stack and the system operation is improved.

The invention also provides a fuel cell stack which comprises the insulating sealing device.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.