Container-type fuel cell system including multi-purpose support frame

Abstract

The present invention relates to a container-type fuel cell system including a multi-purpose support frame and, more specifically, to a container-type fuel cell system including a multi-purpose support frame, the system integrating a frame that supports the exterior thereof and an external air introduction path and a gas discharge path, so as to have a simplified internal structure, and directly introducing external air to a module so as to discharge gas through a blower without backflow while not affecting the indoor temperature of a container, thereby enabling air intake and exhaust.

Description

Containerized fuel cell system with multipurpose support frame

[0001] The present invention relates to a container-type fuel cell system equipped with a multipurpose support frame, and more particularly, to a container-type fuel cell system equipped with a multipurpose support frame capable of supplying and exhausting air, which simplifies the internal structure by integrating a frame that supports the exterior with an external air inlet and a gas exhaust passage, and enables the external air to be directly introduced into a module so as not to affect the indoor temperature of the container, while also exhausting gas without reverse flow through a blower.

[0002] A fuel cell is a device that generates electrical energy through an electrochemical reaction between fuel and an oxidizer. While conventional batteries convert chemical energy from chemicals pre-filled within the cell into electrical energy, fuel cells receive a continuous supply of fuel and oxygen, continuously generating electricity through chemical reactions.

[0003] A fuel cell system is composed of a fuel cell stack that generates electrical energy, a hydrogen supply system that supplies fuel (hydrogen) to the fuel cell stack, an air supply system that supplies oxygen in the air, which is an oxidizing agent necessary for electrochemical reactions, to the fuel cell stack, and a heat and water management system that controls the operating temperature of the fuel cell stack.

[0004] The fuel cell system, which includes a fuel cell stack that generates electricity, a hydrogen supply system that supplies fuel (hydrogen) to the fuel cell stack, an air supply system that supplies oxygen in the air, which is an oxidizing agent necessary for the electrochemical reaction, to the fuel cell stack, and a heat and water management system that controls the operating temperature of the fuel cell stack, is manufactured as a single integrated module structure, and is called a fuel cell integrated module.

[0005] Fuel cell integrated modules are manufactured by packaging multiple fuel cell integrated modules in a specific arrangement within a case depending on the intended use.

[0006] However, the case that packages the conventional fuel cell module is not equipped with a pipe for introducing external air and a pipe for discharging the exhaust gas of the stack, making it difficult to smoothly introduce air and discharge gas, or the case has a complex internal structure because the external air inlet and gas discharge passages are provided separately, and when the temperature outside the case is high, the introduced external temperature affects the temperature inside the case.

[0007] One of the problems to be solved by the present invention is to provide a container-type fuel cell system having a multi-purpose support frame capable of supplying and exhausting air, which simplifies the internal structure by integrating a frame that supports the exterior and an external air inlet and gas exhaust passage.

[0008] Another problem to be solved by the present invention is to provide a container-type fuel cell system having a multipurpose support frame capable of supplying and exhausting air, which can discharge gas without backflow through a blower while allowing outside air to be directly introduced into the module without affecting the indoor temperature of the container.

[0009] The present invention proposes the following container-type fuel cell system to solve the aforementioned problems.

[0010] A container-type fuel cell system of one embodiment may include an inner upper frame including a plurality of fuel cell modules, connected to a plurality of vertical frames, and branching outside air introduced through an inlet formed on one side thereof to a plurality of the fuel cell modules through a first internal conduit therein, and an outer upper frame connected to the plurality of vertical frames and discharging exhaust gas of a stack of the plurality of fuel cell modules through a second internal conduit therein to an outlet formed on one side thereof.

[0011] In one embodiment, the vertical frame may include an inner vertical frame having a first vertical pipe formed therein that communicates with the first internal pipe and supplies the external air to the plurality of fuel cell modules through the first vertical pipe, and an outer vertical frame having a second vertical pipe formed therein that communicates with the second internal pipe and supplies exhaust gas of the fuel cell modules to the second internal pipe through the second vertical pipe.

[0012] In one embodiment, the plurality of fuel cell modules are arranged in a plurality of layers, and the fuel cell modules arranged in the uppermost layer can be supplied with the external air through individual air supply pipes connected to the inner upper frame, and the fuel cell modules arranged in the lower layer can be supplied with the external air through individual air supply pipes connected to the inner vertical frame.

[0013] In one embodiment, the plurality of fuel cell modules are arranged in a plurality of layers, and the fuel cell module arranged in the uppermost layer can exhaust the exhaust gas through an individual exhaust pipe connected to the outer upper frame, and the fuel cell module arranged in the lower layer can exhaust the exhaust gas through an individual exhaust pipe connected to the outer vertical frame.

[0014] In one embodiment, the system may further include a main air supply blower installed at an inlet of the inner upper frame and supplying outside air to the first inner pipe, and individual air supply blowers installed at a portion branching from the inner upper frame to each of the plurality of fuel cell modules and supplying outside air passing through the first inner pipe to the fuel cell modules.

[0015] In one embodiment, the exhaust port may further include a chamber having the exhaust port formed on one side, a blow hole formed on the other side, and a communication hole formed on a side perpendicular to the exhaust port and the blow hole and connected to the inner upper frame, and an exhaust blower that blows air into the blow hole to discharge exhaust gas introduced into the chamber through the exhaust port.

[0016] In one embodiment, the exhaust port may further include an ejector tube provided inside the chamber, one end of which is formed with a larger cross-sectional area than the cross-sectional area of ​​the blow hole and communicates with the blow hole, and the other end of which has a shape with a gradually decreasing cross-sectional area and extends toward the exhaust port.

[0017] According to an embodiment of the present invention, the internal structure can be simplified by integrating a frame supporting the exterior and an external air inlet and gas exhaust passage.

[0018] According to an embodiment of the present invention, outside air is introduced directly into the module, so that the indoor temperature of the container is not affected.

[0019] FIG. 1 is a perspective view of a container-type fuel cell system equipped with a multipurpose support frame according to one embodiment of the present invention.

[0020] Figure 2 is a perspective view showing the inside of the container-type fuel cell system illustrated in Figure 1.

[0021] Figure 3 is an internal plan view showing the inner vertical frame and outer vertical frame shown in Figure 2.

[0022] FIG. 4 is a drawing showing a modified embodiment of the discharge port of the support frame illustrated in FIG. 2.

[0023] Figure 5 is an internal perspective view showing the inner upper frame illustrated in Figure 2.

[0024] Figure 6 is an external perspective view showing the outer upper frame illustrated in Figure 2.

[0025] Hereinafter, several embodiments of the present invention will be described in detail using drawings. However, this is not intended to limit the present invention to any specific embodiment, and it should be understood that all transformations, equivalents, and substitutions that incorporate the technical spirit of the present invention are included within the scope of the present invention.

[0026] In this specification, singular expressions include plural expressions unless the context clearly indicates otherwise.

[0027] When a configuration in this specification is described as "having" or "composing" a sub-configuration, it is intended that the configuration may further include other configurations, rather than excluding other configurations, unless otherwise specifically stated.

[0028] In this specification, the terms “Unit,” “Module,” and “Component” mean a unit that processes at least one function or operation, and may be implemented by hardware, software, or a combination of hardware and software.

[0029] The term “connected” in this specification may mean, but is not limited to, that two components are directly connected, and may also mean that the components are connected via one or more other components positioned between the components.

[0030] FIG. 1 is a perspective view of a container-type fuel cell system equipped with a multipurpose support frame according to one embodiment of the present invention, and FIG. 2 is a perspective view showing the inside of the container-type fuel cell system illustrated in FIG. 1.

[0031] The container-type fuel cell system includes a support frame (110, 120, 130, 140) and a fuel cell module (10).

[0032] The support frame (110, 120, 130, 140) forms the outer shape of the container (1).

[0033] A plurality of fuel cell modules (10) may be provided inside the support frame (110, 120, 130, 140), i.e., inside the container (1). The fuel cell module (10) is preferably composed of a solid oxide fuel cell, but is not necessarily limited to a specific type of fuel cell.

[0034] A plurality of fuel cell modules (10) can be arranged in a plurality of layers, and the arrangement of the fuel cell modules (10) will be described again with reference to FIGS. 5 and 6. A housing (not given a drawing symbol) is provided on the outside of the support frame (110, 120, 130, 140) to form the exterior of the container (1).

[0035] The support frame (110, 120, 130, 140) is formed on a square floor structure.

[0036] The floor structure may be formed with a bulkhead structure to support the load of the heavy fuel cell, and the internal space formed by the bulkhead structure may be used efficiently by arranging cables such as power lines, communication lines, and control lines.

[0037] The support frame (110, 120, 130, 140) is formed by a vertical frame (110, 120) forming the height of the container (1) and an upper frame (130, 140) forming the roof of the container (1).

[0038] The vertical frame (110, 120) includes a plurality of inner vertical frames (110) and a plurality of outer vertical frames (120).

[0039] For convenience of explanation, the explanation will begin with the outer vertical frame (120).

[0040] A plurality of outer vertical frames (120) are arranged spaced apart from each other on both sides of the longitudinal direction of the floor structure.

[0041] A second vertical conduit (120) is formed inside the outer vertical frame (120). For reference, since the second vertical conduit (120) is formed integrally inside the outer vertical frame (120), it will be described by assigning it the same drawing reference number as the outer vertical frame (120).

[0042] The second vertical conduit (120) of the outer vertical frame (120) is a passage through which exhaust gas discharged from the stack of the fuel cell module (10) moves.

[0043] The outer vertical frame (120) can be connected to the stack (fuel electrode output or air electrode output) of the fuel cell module (10) through an individual exhaust pipe (121). This will be described again later with reference to FIG. 6. For reference, a heat recovery device (11) (HRU (Heat Recovery Unit)) may be provided between the fuel cell module (10) and the individual exhaust pipe (121) of the outer vertical frame (120).

[0044] The second vertical conduit (120) of the outer vertical frame (120) is connected to the second inner conduit (140) of the outer upper frame (140).

[0045] The exhaust gas of the fuel cell module (10) introduced into the second vertical pipe (120) of the outer vertical frame (120) can be discharged to the outside through the second internal pipe (140) of the outer upper frame (140).

[0046] The inner vertical frame (110) is arranged at a predetermined distance from the outer vertical frame (120) in the floor structure toward the center of the container (1).

[0047] A plurality of fuel cell modules (10) may be provided between the outer vertical frame (120) and the inner vertical frame (110).

[0048] When the outer vertical frame (120) and the inner vertical frame (110) are arranged along the longitudinal perimeter of the floor structure, the outer vertical frame (120), the inner vertical frame (110) and the fuel cell module (10) can be configured as one set on one longitudinal side of the container (1), and the outer vertical frame (120), the inner vertical frame (110) and the fuel cell module (10) can be configured as another set on the other longitudinal side of the container (1).

[0049] And, a passage space may be formed between the set of the outer vertical frame (120), the inner vertical frame (110), and the fuel cell module (10) arranged on one side in the longitudinal direction inside the container (1), and the set of the outer vertical frame (120), the inner vertical frame (110), and the fuel cell module (10) arranged on the other side.

[0050] A first vertical conduit (110) is formed inside the inner vertical frame (110). For reference, since the first vertical conduit (110) is formed integrally inside the inner vertical frame (110), it will be described by assigning it the same drawing reference number as the inner vertical frame (110).

[0051] Since the interior of the inner vertical frame (110) is empty due to the first vertical conduit (110), the inner vertical frame (110) can be formed of a rigid material. In addition, the outer vertical frame (120), the inner upper frame (130), and the outer upper frame (140) described below can also be formed of a rigid material for the same reason.

[0052] The first vertical pipe (110) is a passage for supplying external air to the stack (air electrode input) of the fuel cell module (10).

[0053] The inner vertical frame (110) can be connected to the stack (air electrode input) of the fuel cell module (10) through individual supply pipes (111). This will be described again later with reference to FIG. 5.

[0054] The first vertical pipe (110) is connected to the first internal pipe (130) of the inner upper frame (130). For reference, since the first internal pipe (130) is integrally formed within the inner upper frame (130), it will be described by assigning it the same drawing reference number as the inner upper frame (130).

[0055] External air introduced through the first internal conduit (130) of the inner upper frame (130) can be supplied to the stack (air electrode input) of the fuel cell module (10) through the first vertical conduit (110) of the inner vertical frame (110).

[0056] The inner upper frame (130) and the outer upper frame (140) will be further described with reference to FIG. 3.

[0057] Figure 3 is an internal plan view showing the inner upper frame (130) and outer upper frame (140) illustrated in Figure 2.

[0058] As shown in FIGS. 2 and 3, the multipurpose support frame (110, 120, 130, 140) includes an inner upper frame (130) and an outer upper frame (140).

[0059] The inner upper frame (130) is arranged to connect the upper portions of each of the plurality of inner vertical frames (110) at the upper portion of the container (1). In other words, the first internal conduit (130) of the inner upper frame (130) is connected to the first vertical conduit (110) of the inner vertical frame (110).

[0060] A first internal conduit (130) is formed inside the inner upper frame (130).

[0061] One end of the first internal conduit (130) of the inner upper frame (130) is connected to an inlet (150) formed on one side in the longitudinal direction of the container (1).

[0062] The inlet (150) is an inlet through which external air flows in. The inner upper frame (130) extends from the inlet (150) toward the outlet (160) while branching into two branches from the upper edge of the container (1).

[0063] The first internal conduit (130) of the inner upper frame (130) may be formed so that the cross-sectional area of ​​the flow path near the inlet (150) is larger than the cross-sectional area of ​​the flow path far from the inlet (150) based on a characteristic point. For example, the first internal conduit (130) of the inner upper frame (130) may be formed so that the cross-sectional area of ​​the flow path gradually decreases from the near part to the far part from the inlet (150).

[0064] The internal shape of the inner upper frame (130) is for the venturi effect, which allows the outside air introduced through the inlet (150) to efficiently move to a long distance. The venturi effect is a phenomenon in which the pressure of a fluid relatively decreases when it passes through a narrow part with a smaller diameter (or cross-sectional area of ​​the flow path) within the pipe, thereby increasing the speed of movement of the fluid.

[0065] When explaining the movement path of the outside air (dotted arrow), the outside air that enters the inlet (150) is supplied to the stack (air electrode input) of the fuel cell module (10) through the first internal conduit (130) of the inner upper frame (130) and the first vertical conduit (110) of the inner vertical frame (110) that is connected to the first internal conduit (130).

[0066] Meanwhile, a main air supply blower (not shown) is installed in the inlet (150) of the inner upper frame (130). The main air supply blower supplies external air to the first internal duct (130) through the operation of a fan.

[0067] An individual supply blower (not shown) may be installed at a portion where the inner upper frame (130) branches off into each of the plurality of fuel cell modules (10), i.e., at a portion that communicates with the first vertical pipe (110) of the inner vertical frame (110).

[0068] The individual supply air blower supplies outside air passing through the first internal conduit (130) via the fan to the fuel cell module (10) via the first vertical conduit (110).

[0069] The fan speed of individual supply blowers can be adjusted differently depending on their location. For example, since the outside air will move slowly in locations far from the inlet (150), the fan speed can be set faster than that of individual supply blowers closer to the inlet (150).

[0070] Additionally, the individual supply air blowers may have their fan speeds adjusted differently depending on the amount of outside air required by each fuel cell module (10).

[0071] As described above, since the high-temperature outside air is supplied directly to the fuel cell module (10) through the inner upper frame (130) and the inner vertical frame (110), it does not affect the temperature inside the container (1). In particular, since an air conditioner is operated inside the container (1) to control the temperature, the operating efficiency of the air conditioner can be increased because the high-temperature outside air does not affect the indoor temperature.

[0072] The outer upper frame (140) is arranged to connect the upper portions of each of the plurality of outer vertical frames (120) at the upper portion of the container (1). In other words, the second inner conduit (140) of the outer upper frame (140) is connected to the second vertical conduit (120) of the outer vertical frame (120).

[0073] A second internal conduit (140) is formed inside the outer upper frame (140). For reference, since the second internal conduit (140) is formed integrally inside the outer upper frame (140), it will be described by assigning it the same drawing reference number as the outer upper frame (140).

[0074] The second inner conduit (140) of the outer upper frame (140) is connected to the outlet (160) formed on the other longitudinal side of the container (i.e., in the opposite direction to the inlet) of the container (1).

[0075] For example, inside the container (1), a fuel cell module (10) and an inner upper frame (130) and an outer upper frame (140) are arranged on one side and the other side in the longitudinal direction, respectively, and the ends of the outer upper frames (140) arranged on both sides in the longitudinal direction of the container (1) are connected to both sides of the discharge port (160).

[0076] The second inner conduit (140) of the outer upper frame (140) may be formed so that the cross-sectional area of ​​the flow path near the outlet (160) is larger than the cross-sectional area of ​​the flow path far from the outlet (160) based on a specific point. The specific point referred to here may be the same point as the specific point where the cross-sectional area of ​​the flow path of the inner upper frame (130) changes. Since the cross-sectional areas of the flow paths of the inner upper frame (130) and the outer upper frame (140) change based on the characteristic point, the Venturi effect can be utilized while increasing the utilization of space.

[0077] For reference, the second inner conduit (140) of the outer upper frame (140) may be formed in a shape in which the cross-sectional area of ​​the conduit gradually decreases from the location near the discharge port (160) to the location farther away.

[0078] The reason why the cross-sectional area of ​​the flow path of the second inner conduit (140) of the outer upper frame (140) that is far from the exhaust port (160) is smaller than the cross-sectional area of ​​the flow path near the exhaust port (160) is to increase the movement speed of the fluid in the area far from the exhaust port (160) (the flow path with a small cross-sectional area) and smoothly move the exhaust gas of the fuel cell to the exhaust port (160).

[0079] When explaining the movement path (solid arrow) of the exhaust gas of the fuel cell module (10), the exhaust gas of the fuel cell module (10) is introduced into the second vertical pipe (120) of the outer vertical frame (120) and then exhausted to the exhaust port (160) through the second inner pipe (140) of the outer upper frame (140).

[0080] Meanwhile, the exhaust port (160) may further include an exhaust blower (165) for exhausting exhaust gas inside the outer upper frame (140) to the outside through power.

[0081] For example, the exhaust port (160) may be formed in the shape of a chamber (161).

[0082] An exhaust port (161), a blow hole (162), and a communication hole (163) are formed in the chamber (161).

[0083] The exhaust port (161) is formed on one side of the chamber (161), that is, on the surface facing the outside of the container (1). The exhaust port (161) is where exhaust gas is directly discharged.

[0084] A blowhole (162) is formed on the opposite side of the exhaust port (161) of the chamber (161). The blowhole (162) is a hole that communicates with the exhaust pipe (not indicated in the drawing) of the exhaust blower (165). When wind is generated from the exhaust blower (165), it flows into the blowhole (162) of the chamber (161).

[0085] A communication hole (163) is formed on both sides of the chamber (161) where the exhaust port (161) and the blow hole (162) are perpendicular. The communication hole (163) is communicated with the end of the outer upper frame (140).

[0086] The exhaust blower (165) can generate artificial wind inside the chamber (161) to accelerate the discharge of exhaust gas flowing into the exhaust port (160) from the outer upper frame (140).

[0087] In addition, the exhaust gas of the fuel cell introduced into the outer vertical frame (120) and the outer upper frame (140) can be discharged to the outside without reverse flow by the exhaust blower (165) without a separate physical valve.

[0088] FIG. 4 is a drawing showing a modified embodiment of the discharge port (160) of the support frame (110, 120, 130, 140) illustrated in FIG. 2.

[0089] As shown in Fig. 4, the outlet (160) can perform an ejector function. Specifically, the interior of the outlet (160) can further include an ejector tube (164) for performing an ejector function.

[0090] An ejector tube (164) is provided inside the chamber (161). One end of the ejector tube (164) is formed with an area larger than the cross-sectional area of ​​the blowhole (162) and is connected to the blowhole (162), and the other end extends toward the exhaust port (161).

[0091] At this time, the other end of the ejector tube (164) extending toward the exhaust port (161) may have a shape in which the cross-sectional area (i.e., flow path) gradually decreases.

[0092] An ejector tube (164) of this shape can accelerate the discharge of exhaust gas flowing into the exhaust port (160) from the outer upper frame (140) by increasing the speed of the wind generated from the exhaust blower (165) using the venturi effect.

[0093] Figure 5 is an internal perspective view showing the inner upper frame (130) illustrated in Figure 2.

[0094] In Fig. 5, a case in which fuel cell modules (10) are arranged in multiple layers (e.g., two layers) inside a container (1) is described as an example. The fuel cell modules (10) may be arranged in two layers as in Fig. 5, but may also be arranged in three or more layers.

[0095] The fuel cell module (10) (air electrode input) placed on the top floor is supplied with the external air through an individual air supply pipe (131) connected to the inner upper frame (130).

[0096] The fuel cell module (10) (air electrode input) placed on the lower layer is supplied with external air through an individual air supply pipe (111) connected to the inner vertical frame (110).

[0097] For example, fuel cell modules (10) can be arranged on both sides based on the inner vertical frame (110), and individual supply pipes (111) of the inner vertical frame (110) can be provided to communicate with the fuel cell modules (10) (air electrode input) on both sides, respectively.

[0098] Figure 6 is an external perspective view showing the outer upper frame (140) illustrated in Figure 2.

[0099] In Fig. 6, a case in which fuel cell modules (10) are arranged in multiple layers (e.g., two layers) inside a container (1) is described as an example. The fuel cell modules (10) may be arranged in two layers as in Fig. 6, but may also be arranged in three or more layers.

[0100] The fuel cell module (10) (air electrode output or fuel electrode output) placed on the top floor exhausts exhaust gas through an individual exhaust pipe (141) connected to the outer upper frame (140).

[0101] The fuel cell module (10) placed on the lower layer exhausts exhaust gas through an individual exhaust pipe (121) connected to the outer vertical frame (120).

[0102] For example, the fuel cell modules (10) can be arranged on both sides based on the outer vertical frame (120), and the individual exhaust pipes (121) of the outer vertical frame (120) can be provided to communicate with the fuel cell modules (10) (air electrode input) on both sides, respectively.

[0103] Although the present invention has been described above with reference to several embodiments, it will be understood by those skilled in the art that various modifications and changes can be made to the present invention without departing from the spirit and scope of the present invention as set forth in the claims below.

Claims

1. Multiple fuel cell modules; A plurality of vertical frames formed around the periphery of the plurality of fuel cell modules; An inner upper frame connected to the plurality of vertical frames and branching external air introduced through an inlet formed on one side to a plurality of the fuel cell modules through a first internal conduit (130); and An outer upper frame connected to the plurality of vertical frames and discharging exhaust gas from the stack of the plurality of fuel cell modules to an exhaust port formed on one side through a second internal conduit (140) therein. A container-type fuel cell system equipped with a multipurpose support frame including:

2. In paragraph 1, The above vertical frame, An inner vertical frame in which a first vertical pipe (110) is formed that is connected to the first internal pipe (130) and supplies the external air to the plurality of fuel cell modules through the first vertical pipe (110); and A second vertical pipe (120) is formed that is connected to the second internal pipe (140), and an outer vertical frame that supplies exhaust gas of the fuel cell module to the second internal pipe (140) through the second vertical pipe (120) A container-type fuel cell system equipped with a multipurpose support frame including:

3. In paragraph 2, The above plurality of fuel cell modules are arranged in multiple layers, The fuel cell module placed on the top floor is supplied with the outside air through an individual air supply pipe connected to the inner upper frame. A container-type fuel cell system equipped with a multipurpose support frame, characterized in that the fuel cell module arranged on the lower layer receives the external air through an individual air supply pipe connected to the inner vertical frame.

4. In paragraph 2, The above plurality of fuel cell modules are arranged in multiple layers, The fuel cell module placed on the top floor exhausts the exhaust gas through an individual exhaust pipe connected to the outer upper frame. A container-type fuel cell system equipped with a multipurpose support frame, characterized in that the fuel cell module arranged on the lower layer exhausts the exhaust gas through an individual exhaust pipe connected to the outer vertical frame.

5. In paragraph 1, A main air supply blower installed at the inlet of the inner upper frame and supplying outside air to the first inner duct; and An individual air supply blower installed at a portion branching from the inner upper frame to each of the plurality of fuel cell modules, and supplying external air passing through the first internal conduit to the fuel cell module. A containerized fuel cell system equipped with a multipurpose support frame including:

6. In paragraph 1, The above outlet is, A chamber having an exhaust port formed on one side, a blow hole formed on the other side, and a communication hole formed on a side perpendicular to the exhaust port and the blow hole to connect to the inner upper frame; and An exhaust blower that blows air into the blowhole to discharge exhaust gas flowing into the chamber through the exhaust port. A containerized fuel cell system equipped with a multipurpose support frame including:

7. In paragraph 6, The above outlet is, A container-type fuel cell system having a multipurpose support frame further including an ejector tube provided inside the chamber, one end of which is formed with an area larger than the cross-sectional area of ​​the blowhole and communicates with the blowhole, and the other end of which has a shape with a gradually decreasing cross-sectional area and extends toward the exhaust port.

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