KR102452699B1 - Air block device for preventing flowed in condensate water - Google Patents

Abstract

The present invention discloses an air breaker for preventing the inflow of condensate. Air circuit breaker for preventing the inflow of condensed water according to an embodiment of the present invention is a first pipe located inside; a second pipe located outside the first pipe and communicating with the upper part of the first pipe; and a third pipe positioned outside the second pipe and having a closed lower part; An air shutoff valve is provided.

Description

{AIR BLOCK DEVICE FOR PREVENTING FLOWED IN CONDENSATE WATER}

The present invention relates to an air breaker for preventing the inflow of condensed water, and more particularly, to an air breaker for preventing the inflow of condensed water, which can improve fuel cell stack durability and voltage safety by blocking the inflow of condensed water into a fuel cell stack.

In general, a fuel cell vehicle is driven using electric energy continuously generated by an electrochemical reaction, which is a reverse reaction of electrolysis of water, in which hydrogen supplied from a fuel supply unit and oxygen in air supplied from an air supply unit are supplied to a humidifier. do.

Here, the fuel cell system applied to the hydrogen fuel cell vehicle includes a fuel cell stack that generates electric energy from an electrochemical reaction of a reaction gas, a hydrogen supply device that supplies hydrogen as fuel to the fuel cell stack, and a fuel cell stack. An air supply device that supplies air containing oxygen, an oxidizing agent required for electrochemical reaction, and heat, a by-product of the electrochemical reaction of the fuel cell stack, is discharged to the outside to optimally control the operating temperature of the fuel cell stack and to improve the water management function. It is configured to include a heat and water management system to perform and a fuel cell system controller to control overall operation of the fuel cell system.

In general, the hydrogen supply device includes a hydrogen tank, a high pressure/low pressure regulator, a hydrogen valve, a hydrogen recirculation device, etc., the air supply device includes an air blower, an air valve, a humidifier, etc., and the heat and water management system is a cooling water pump , radiators, and the like.

In the hydrogen supply device, high-pressure hydrogen supplied from the hydrogen tank passes through the high-pressure/low-pressure regulator in turn, and then is supplied to the fuel cell stack at low pressure. is recycled back to the anode to promote the reuse of hydrogen.

The air supply device includes an air cleaner that filters foreign substances contained in the air, an air blower that compresses and supplies the air filtered by the air cleaner, and a control box that controls the air blower, and is supplied by the air blower. While the dry air passes through the humidifier, it is humidified by exchanging moisture with the exhaust gas (wet air) discharged from the cathode outlet of the stack, and then supplied to the cathode inlet of the fuel cell stack.

In general, the fuel cell vehicle is less durable when air flows in through the cathode inlet and outlet of the fuel cell stack after the end of operation. are doing

1 is a perspective view of a conventional air valve device.

Referring to FIG. 1 , a conventional air valve device for a fuel cell system includes a valve body 10 having an air passage 11 connected to a cathode 1a of a fuel cell stack 1 ; and a valve flap 20 rotatably installed in the valve body 10 for opening and closing the air passage 11 .

The air passage 11 formed in the valve body 10 is an inlet air passage 11a through which humidified external air flows into the cathode 1a side of the fuel cell stack 1 and air is discharged from the cathode 1a. and an outlet air passage 11b, wherein the inlet air passage 11a and the outlet air passage 11b are formed in one valve body (10).

The valve flap 20 is configured in plurality to open and close the inlet air passage 11a and the outlet air passage 11b, respectively, and the plurality of valve flaps 20 include the inlet air passage 11a and It is configured to open and close the outlet air passages 11b at the same time.

The valve body 10 is a main body 12 constituting the external shape of the valve device in which the valve flap 20 is rotatably installed, and the valve flap 20 is in contact with the valve flap 20 when the valve flap 20 is opened and closed. and a sub-body 13, wherein the main body 12 and the sub-body 13 are separably coupled to each other.

The conventional air shutoff valve blocks the inflow of air into the stack after the fuel cell stack is shut down, thereby improving the durability of the electrolyte membrane and the catalyst layer in the fuel cell stack.

However, the conventional air shutoff valve does not have a structure to prevent condensed water flowing into the stack through the humidifier during operation, so it is difficult to maintain voltage stability of the fuel cell stack during operation.

Such condensed water makes it impossible to maintain voltage stability of the fuel cell stack, thereby deteriorating not only vehicle durability but also safety.

Republic of Korea Patent Application No. 10-2017-0097810

In one embodiment of the present invention, in order to overcome the problems of the prior art, the inflow of moisture into the fuel cell stack is prevented, and the condensed water attached to the outer pipe wall in the form of a film is also prevented from flowing into the stack, thereby blocking the inflow of condensed water. Accordingly, it is an object of the present invention to provide an air circuit breaker that prevents the inflow of condensed water, which can also prevent cell dropout in the fuel cell stack.

According to one aspect of the present invention, there is provided an air circuit breaker for a fuel cell system, comprising: a first pipe positioned inside; a second pipe positioned outside the first pipe and communicating with the upper part of the first pipe; and a third pipe positioned outside the second pipe and having an open/closed lower part; An air shutoff valve is provided.

A lower portion of the first pipe may communicate with the humidifier pipe.

One or more holes through which air is discharged may be drilled in an upper portion of the first pipe.

Upper ends of the first pipe and the second pipe may be opened and closed by the air shutoff valve.

The air shutoff valve may be provided at an upper end of the second pipe.

The air shutoff valve may be closed by its own weight when not in operation.

The air shutoff valve may be stopped by the first pipe or the second pipe, so that a part or all of the third pipe may be closed.

The air shutoff valve may be opened by air supplied from the humidifier.

The air shutoff valve may include a first valve part and a second valve part having a shape corresponding to the first valve part.

The first valve part and the second valve part may be connected by a hinge.

The length of the second pipe may be smaller than the length of the lower end sealing part of the third pipe from the upper end of the second pipe.

A baffle may be provided inside the third pipe.

A baffle may be positioned above the air shutoff valve.

The baffle may have a disk shape.

The baffle may have a structure inclined downwardly inward of the third pipe.

The lower end of the third pipe may have a structure in which a bypass flow path for collecting condensed water is communicated.

The other end of the bypass flow path may have a structure in communication with the humidifier tube.

An upper portion of the third pipe may communicate with the air manifold.

According to another aspect of the present invention, there is provided an air circuit breaker for a fuel cell system, comprising: a first pipe positioned inside; a second pipe located outside the first pipe and communicating with the upper part of the first pipe; and a third pipe positioned outside the second pipe and having a closed lower part; A baffle is provided, and an air shutoff valve may be positioned above the baffle.

According to another aspect of the present invention, there is provided an air circuit breaker for a fuel cell system, comprising: a first pipe positioned inside; and a second pipe located outside the first pipe and communicating with the upper part of the first pipe, and a third pipe located outside the second pipe and having a closed lower part, the middle part of the third pipe The silver may have an inwardly concave shape so that the condensed water stays there.

According to one embodiment of the present invention, the air breaker for preventing the inflow of condensed water blocks the inflow of condensed water by changing the flow direction of the condensed water and humidified air according to the structure of the pipe to prevent the inflow of moisture into the fuel cell stack, and also The baffle also prevents the inflow of condensed water attached to the outer pipe wall in the form of a film into the stack, thereby eliminating the cell dropout phenomenon in the fuel cell stack, thereby improving vehicle efficiency and improving voltage safety.

1 is a perspective view of a conventional air valve device.
Figure 2 is a schematic diagram of an air circuit breaker for preventing the inflow of condensed water according to an embodiment of the present invention.
3 is a schematic diagram of the operation according to the stack operation of the air circuit breaker for preventing the inflow of condensed water according to an embodiment of the present invention of FIG. 2 .
4 is a schematic diagram showing the flow of air and condensate according to the stack operation of the air circuit breaker for preventing the inflow of condensed water according to an embodiment of the present invention of FIG. 2 .
5 is a schematic diagram illustrating the flow of air and condensate according to the stack operation of the air circuit breaker for preventing the inflow of condensate according to another embodiment of the present invention.
6 is a schematic diagram showing the flow of air and condensate according to the stack operation of the air circuit breaker for preventing the inflow of condensate according to another embodiment of the present invention.
7 is a schematic diagram showing a flow analysis result of an air circuit breaker for preventing the inflow of condensed water according to an embodiment of the present invention.

The embodiments described below are provided so that those skilled in the art can easily understand the technical spirit of the present invention, and the present invention is not limited thereto. In addition, the matters expressed in the accompanying drawings may be different from the forms actually implemented in the drawings schematically for easy explanation of the embodiments of the present invention.

When a component is referred to as being connected or connected to another component, it may be directly connected or connected to the other component, but it should be understood that another component may exist in between.

And, "connection" herein includes direct connection and indirect connection between one member and another member, and may mean all physical connections such as adhesion, attachment, fastening, bonding, and bonding.

In addition, expressions such as 'first, second', etc. are used only for distinguishing a plurality of components, and do not limit the order or other characteristics between the components.

The singular expression includes the plural expression unless the context clearly dictates otherwise. Terms such as "comprises" or "having" are intended to mean that a feature, number, step, action, component, part, or combination thereof described in the specification exists, and one or more other features or numbers, It may be construed that steps, operations, components, parts, or combinations thereof may be added.

First, before explaining the air breaker for preventing the inflow of condensed water according to the present invention, the conventional air shutoff valve blocks the inflow of air into the stack after the fuel cell stack is shut down, but there is no structure to prevent condensate, so safety is hindered cause problems that

Accordingly, there is a need for an air circuit breaker capable of preventing the phenomenon of condensed water from flowing into the stack and thus resolving the cell dropout phenomenon in the fuel cell stack. An air circuit breaker is provided to prevent condensate from entering.

2 is a schematic diagram of an air circuit breaker for preventing the inflow of condensed water according to an embodiment of the present invention, and FIG. It is a schematic diagram of operation, and FIG. 4 is a schematic diagram showing the flow of air and condensate according to the stack operation of the air circuit breaker for preventing the inflow of condensate according to an embodiment of the present invention of FIG. 2 .

2 to 4 together, the air circuit breaker 100 for preventing the inflow of condensed water according to an embodiment of the present invention is a first pipe 110 located inside, and the outside of the first pipe 110 . and a second pipe 120 that is located in and communicates with the upper part of the first pipe 110 and a third pipe 130 that is located outside the second pipe 120 and whose lower part is sealed, An air shut-off valve 140 is provided inside the third pipe 130 .

In one specific example, the lower portion of the first pipe 110 communicates with the humidifier pipe, and one or more holes 112 through which air is discharged are drilled in the upper portion of the first pipe 110 .

A second pipe 120 communicates with the first pipe 110 , and the second pipe 120 is located outside the first pipe 110 and communicates with the upper portion of the first pipe 110 . has been Here, the upper ends of the first pipe 110 and the second pipe 120 are opened and closed by the air shutoff valve 140 , and the diameter of the second pipe 120 is the diameter of the first pipe 110 . It is configured to be larger and communicates with the second pipe 120 through one or more holes 112 drilled in the upper part of the first pipe 110 . In this case, the length L2 of the second pipe 120 has a length smaller than the length L1 of the sealing part of the lower end of the third pipe 130 from the upper end of the second pipe 120 .

Then, an air shutoff valve 140 is provided at the upper end of the second pipe 120 , and the air shutoff valve 140 is closed by its own weight when not in operation. In addition, the air shutoff valve 140 is stopped by the first pipe 110 or the second pipe 120 so that a part or all of the third pipe 130 is closed, and is opened by the air supplied from the humidifier. is the structure

In one specific example, the air shutoff valve 140 is configured to include a first valve part 141 and a second valve part 142 having a shape corresponding to the first valve part 141, and the The first valve part 141 and the second valve part 142 are connected to each other by a hinge positioned in the center to open and close.

On the other hand, the third pipe 130 is located outside the second pipe 120 and has a closed lower portion, and the diameter of the third pipe 130 is larger than the diameter of the second pipe 120 . .

In addition, the baffle 150 is positioned above the air shutoff valve 140 , the baffle 150 is provided inside the third pipe 130 , and the baffle 150 has a disk shape, and the third It has a structure inclined downward to the inside of the pipe 130 . Here, the third pipe 130 has a closed lower portion, and a bypass flow path 132 for collecting condensed water is communicated with the lower end of the third pipe 130 . The other end of the bypass flow path 132 communicating with the third pipe 130 is in communication with the humidifier tube.

In this structure, the upper portion of the third pipe 130 provided with the bypass flow path 132 communicates with the air manifold.

As described above, when the overall configuration and function of the air circuit breaker 100 for preventing the inflow of condensed water according to an embodiment of the present invention will be described in detail, the first pipe 110 , the second pipe 120 and the third pipe The triple pipe of 130 has a basic structure and the first pipe 110 at the innermost center is connected to the pipe communicating with the humidifier. In addition, one or more holes 112 are perforated in the upper portion of the first pipe 110 so as to be connected to the second pipe 120 located in the middle, and the upper part of the first pipe 110 and the second pipe 120 . is open and closed. In addition, the third pipe 130 located at the outermost side is closed at the bottom, and a bypass flow path 132 capable of discharging condensed water to the outside is communicated at one side of the lower side, and the bypass flow path 132 is a humidifier. It communicates with my hollow fiber membrane tube. Here, the upper part of the third pipe 130 communicates with the common distributor of the fuel cell stack. In addition, the baffle 150, which is a disk-shaped structure, is provided at an angle in the middle of the upper middle of the third pipe 130, and the central portion is connected to the upper end of the second pipe 120 by a hinge structure. A valve 140 is provided.

Preferably, the air shutoff valve 140 is provided at the upper end of the second pipe 120, and the opening and closing of the air shutoff valve 140 is closed by its own weight when the air shutoff valve 140 is not in operation, and the humidifier It is opened by the air supplied from the , and is stopped by the first pipe 110 or the second pipe 120 to partially or all of the third pipe 130 is closed.

When the fuel cell stack of the air circuit breaker 100 for preventing the inflow of condensed water according to the present invention is operated and the fuel cell stack is shut down, first, during the stack operation, as shown in the left diagram of FIG. The air shutoff valve 140 having a semicircular structure connected by a hinge moves to the upper part by the momentum of the flow, and a flow occurs inside the pipe, and through this, the humidified air from the humidifier moves to the fuel cell stack air manifold.

In addition, as shown in the right diagram of FIG. 3 , in a state in which the fuel cell stack operation is stopped, since there is no air flowing through the humidifier, the force applied to the air shutoff valve 140 is removed, and the air shutoff valve 140 loses its own weight. Thus, the upper ends of the first pipe 110 and the second pipe 120 are closed to block the air flow of part or all of the third pipe 130 . Accordingly, the air flowing into the fuel cell stack is blocked to prevent deterioration of the catalyst layer and the electrolyte membrane due to inflow of air after shutdown.

In this case, the bypass flow path is located at the lower end of the third pipe 130 and is connected to the tube side of the hollow fiber membrane layer in the humidifier. When the condensed water separated in the air shutoff valve 140 gathers at the lower end of the third pipe 130, it moves to the humidifier tube side through the bypass flow path, and this condensate water is used to humidify the dry air again in the hollow fiber membrane layer in the humidifier. do.

Now, when the generation of condensed water and blocking of the inflow to the fuel cell stack by the air circuit breaker 100 for preventing the inflow of condensed water according to the present invention will be described in detail, as shown in the left drawing of FIG. 4 , the first pipe 110 ) is connected to the pipe coming out of the humidifier so that humidified air and condensed water are introduced from the humidifier, and the condensed water and humidified air flow to the second pipe 120 through one or more holes 112 . The upper portion of the second pipe 120 is closed, and the condensed water and humidified air introduced from the first pipe 110 can flow only in the lower direction. The flow through the second pipe 120 is converted to a downward direction, and the condensed water is collected in the lower part of the third pipe 130 by the weight of the condensed water itself in this process.

On the contrary, the humidified air moves to the common branch air manifold through the upper part of the third pipe 130 . The flow velocity of the air changes according to the output of the fuel cell stack. At the maximum output, some condensed water may move to the upper part due to the strong flow velocity of the air flow velocity, but the movement is prevented by the baffle baffle 150 located on the inner wall of the third pipe 130 . Condensed water is collected in the lower part of the third pipe 130 along the inner wall of the third pipe 130 again. Here, some condensed water is stagnated between the baffle 150 and the third pipe 130 , and then when the flow rate of air is weakened, it may be collected at the lower portion along the inner wall of the third pipe 130 . When the condensed water is collected in the lower part, it is discharged to the outside through the valve of the bypass pipe. Through this configuration, condensed water is prevented from flowing into the fuel cell stack.

5 is a schematic diagram illustrating the flow of air and condensate according to the stack operation of the air circuit breaker for preventing the inflow of condensate according to another embodiment of the present invention.

Referring to FIG. 5 , the air circuit breaker 200 for preventing the inflow of condensed water according to another embodiment of the present invention is a first pipe 110 located inside, and a first pipe 110 located outside the first pipe 110 . It is configured to include a second pipe 120 communicating with the upper part of the pipe 110 and a third pipe 130 positioned outside the second pipe 120 and having a closed lower part.

A second pipe 120 is communicated with the first pipe 110 , and the second pipe 120 is located outside the first pipe 110 and is in communication with the upper part of the first pipe 110 . have. Here, the upper ends of the first pipe 110 and the second pipe 120 are opened and closed, and the diameter of the second pipe 120 is larger than the diameter of the first pipe 110 . It communicates with the second pipe 120 through one or more holes 112 drilled in the upper portion of the first pipe 110 , and the third pipe 130 is located outside the second pipe 120 . and the lower part is sealed, and the diameter of the third pipe 130 is larger than the diameter of the second pipe 120 .

Specifically, a baffle 150 is provided on the inside of the third pipe 130 to the upper side spaced apart from the upper end of the second pipe 120 , and the air shutoff valve 140 is provided to the upper side of the baffle 150 . is provided, and the air shutoff valve 140 is closed by its own weight when not in operation. The air shutoff valve 140 is provided, and the first valve part 141 and the second valve part 142 are connected by a hinge located in the center. The air shutoff valve 140 is closed by its own weight when not in operation, and is stopped by the first pipe 110 or the second pipe 120 so that a part or all of the third pipe 130 is closed. In addition, the air shutoff valve 140 is configured to include a first valve part 141 and a second valve part 142 having a shape corresponding to the first valve part 141 .

As such, the overlapping description of the same structure will be omitted except that the installation positions of the air shutoff valve 140 and the baffle 150 are different.

6 is a schematic diagram showing the flow of air and condensate according to the stack operation of the air circuit breaker for preventing the inflow of condensed water according to another embodiment of the present invention.

Referring to FIG. 6 , the air circuit breaker 300 for preventing the inflow of condensed water is located outside the first pipe 110 and the first pipe 110 located inside and communicates with the upper part of the first pipe 110 . It is configured to include a second pipe 120 and a third pipe 130 that is located outside the second pipe 120 and whose lower part is sealed.

A second pipe 120 is communicated with the first pipe 110 , and the second pipe 120 is located outside the first pipe 110 and is in communication with the upper part of the first pipe 110 . have. Here, the upper ends of the first pipe 110 and the second pipe 120 are opened and closed, and the diameter of the second pipe 120 is larger than the diameter of the first pipe 110 . The first pipe 110 communicates with the second pipe 120 through one or more holes 112 drilled in the upper portion of the first pipe 110 .

Then, an air shutoff valve 140 is provided at the upper end of the second pipe 120 , and the air shutoff valve 140 is closed by its own weight when not in operation, and the first pipe 110 or the second pipe It is stopped by 120 and a part or all of the third pipe 130 is closed. In addition, the air shutoff valve 140 is configured to include a first valve part 141 and a second valve part 142 having a shape corresponding to the first valve part 141, and the first valve part 141 and the second valve part 142 are connected by a hinge located in the center.

On the other hand, the third pipe 130 is located outside the second pipe 120 and has a closed lower portion, and the diameter of the third pipe 130 is larger than the diameter of the second pipe 120 . .

In addition, a baffle 150 is provided at a position spaced apart from the upper end of the second pipe 120 inside the third pipe 130 , and the baffle 150 is disc-shaped and of the third pipe 130 . It is a structure that slopes downward inwardly.

Specifically, the air circuit breaker 300 for preventing the inflow of condensed water has a structure in which the middle portion of the third pipe 130 corresponding to the portion where the second pipe 120 is located is concave inwardly so that the condensed water stays, that is, the outside When viewed from, it has an outwardly convex shape.

That is, it is a principle of widening the space of the central portion of the third pipe 130 to generate an external flow in the space of the third pipe 130 . In the section in which the momentum to go upward through the vortex generated here is lost, the condensed water having a large weight in the flow of the flow loses the flow momentum and has a structure that can be collected downward on the widened wall of the third pipe 130 . In the expanded space of the third pipe 130, only a vortex of flow appears in a state where there is relatively no main flow of air, so that the condensate attached to the wall of the third pipe 130 in the form of a film stays, so that it is easily lowered to the lower part of the pipe. structure that can flow.

7 is a schematic diagram showing a flow analysis result of an air circuit breaker for preventing the inflow of condensed water according to an embodiment of the present invention.

Referring to FIG. 7, the operating principle and effect of the air circuit breaker for preventing the inflow of condensed water according to the present invention will be described. Conventionally, humidified air passing through the humidifier in the air supply system is introduced into the fuel cell stack together with the condensed water in the humidifier. do. When this phenomenon occurs, due to the inflow of moisture into the fuel cell stack, the performance of the fuel cell stack cell becomes non-uniform and a cell dropout phenomenon occurs.

For example, cell separation occurs in the separator in the fuel cell stack so that the condensed water accumulated in the humidifier moves at a high flow rate during sudden start after idle operation. In order to prevent this, methods have been proposed to prevent moisture from flowing into the battery cells by changing the shape of the humidifier out cap or by expanding the bypass flow path of the end cell heater in the fuel cell stack.

However, since a device for actively separating and removing moisture from humidified air is not known in the prior art, a device for preventing the inflow of condensed water into the fuel cell stack is required.

Therefore, according to the triple pipe structure consisting of the first pipe 110, the second pipe 120 and the third pipe 130 according to the present invention, the flow direction of the condensed water and the humidified air is changed, but the air in area A is is present and moisture flows in from area B. As the water introduced in this way moves along the triple pipe structure, condensed water is separated and collected in the C area, and the condensed water is mixed with humidified air in the form of mist in the D area. It is possible to separate from humidified air by means of the baffle, and also prevents the inflow of condensed water attached to the outer pipe wall in the form of a film into the stack, thereby minimizing the inflow of condensed water and delaying the time to alleviate the phenomenon of cell dropout in the stack. can be prevented

Those of ordinary skill in the art to which the present invention pertains will understand that the present invention may be embodied in other specific forms without changing the technical spirit or essential features thereof. Therefore, the embodiments described above are only presented by selecting and presenting the most preferred embodiments in order to help those skilled in the art understand from among various possible embodiments, and the technical spirit of the present invention is not necessarily limited or limited only by the presented embodiments. No, it is revealed that various changes, additions, and changes are possible within the scope without departing from the technical spirit of the present invention, as well as other equivalent embodiments are possible. The scope of the present invention is indicated by the claims described below rather than the above detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts are included in the scope of the present invention. should be interpreted In addition, on the basis of the principle that the inventor can appropriately define the concept of a term to describe his invention in the best way, the terms or words used in the present specification and claims are defined, and conventional or dictionary It should not be construed as being limited only by meaning. In addition, the order of the components described in the above process does not necessarily have to be performed in a time series order, and even if the execution order of each component and step is changed, if the gist of the present invention is satisfied, such a process may fall within the scope of the present invention. of course there is

100: air breaker to prevent the ingress of condensate
110: first pipe 112: holes
120: second pipe 130: third pipe
132: bypass flow path 140: air shutoff valve
141: first valve unit 142: second valve unit
150: baffle
200, 300: air breaker to prevent the ingress of condensate

Claims (20)

In the air circuit breaker for a fuel cell system,
a first pipe located on the inside;
a second pipe located outside the first pipe and communicating with an upper part of the first pipe; and
a third pipe located outside the second pipe and having a closed lower part;
including,
An air blocker for preventing the inflow of condensed water, characterized in that an air shutoff valve is provided inside the third pipe. The method of claim 1,
An air circuit breaker for preventing the inflow of condensed water, characterized in that the lower portion of the first pipe communicates with the humidifier pipe. The method of claim 1,
An air circuit breaker for preventing the inflow of condensed water, characterized in that one or more holes through which air is discharged are drilled in the upper portion of the first pipe. The method of claim 1,
An air circuit breaker for preventing the inflow of condensed water, characterized in that the upper ends of the first pipe and the second pipe are opened and closed by the air shutoff valve. The method of claim 1,
The air shutoff valve is an air blocker for preventing the inflow of condensed water, characterized in that provided at the upper end of the second pipe. 6. The method of claim 5,
The air shutoff valve is an air blocker for preventing the inflow of condensed water, characterized in that closed by its own weight when not in operation. 6. The method of claim 5,
The air shutoff valve is stopped by the first pipe or the second pipe, and a part or all of the third pipe is closed. 6. The method of claim 5,
The air shutoff valve is an air blocker for preventing the inflow of condensed water, characterized in that it is opened by the air supplied from the humidifier. 6. The method of claim 5,
The air shutoff valve,
a first valve unit; and
a second valve part having a shape corresponding to the first valve part;
Air breaker to prevent the inflow of condensate, characterized in that it comprises a. 10. The method of claim 9,
The air circuit breaker for preventing the inflow of condensed water, characterized in that the first valve portion and the second valve portion are connected by a hinge. The method of claim 1,
The length of the second pipe is an air circuit breaker for preventing the inflow of condensed water, characterized in that smaller than the length of the sealing portion of the lower end of the third pipe from the top of the second pipe. The method of claim 1,
An air circuit breaker for preventing the inflow of condensed water, characterized in that a baffle is provided inside the third pipe. The method of claim 1,
An air breaker for preventing the inflow of condensed water, characterized in that a baffle is located above the air shutoff valve. 13. The method of claim 12,
The baffle is an air breaker for preventing the inflow of condensed water, characterized in that the disk-shaped. 13. The method of claim 12,
The baffle is an air circuit breaker for preventing the inflow of condensed water, characterized in that downwardly inclined to the inside of the third pipe. The method of claim 1,
An air circuit breaker for preventing the inflow of condensed water, characterized in that a bypass passage for collecting condensed water is communicated at the lower end of the third pipe. 17. The method of claim 16,
The other end of the bypass flow path is an air breaker for preventing the inflow of condensed water, characterized in that in communication with the humidifier tube. The method of claim 1,
The air circuit breaker, characterized in that the upper portion of the third pipe is in communication with the air manifold. In the air circuit breaker for a fuel cell system,
a first pipe located on the inside;
a second pipe located outside the first pipe and communicating with an upper part of the first pipe; and
a third pipe located outside the second pipe and having a closed lower part;
including,
An air circuit breaker for preventing the inflow of condensed water, characterized in that a baffle is provided inside the third pipe, and an air shutoff valve is located above the baffle. In the air circuit breaker for a fuel cell system,
a first pipe located on the inside;
a second pipe located outside the first pipe and communicating with an upper part of the first pipe; and
a third pipe located outside the second pipe and having a closed lower part;
including,
An air circuit breaker for preventing the inflow of condensed water, characterized in that the middle portion of the third pipe is concave inwardly so that the condensed water stays.

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