An air humidification device

Abstract

The application discloses an air humidifying device, and relates to the technical field of fuel cells, which comprises a humidifying main body, a first flow valve, a second flow valve and a first humidity sensor. An air inlet cavity, an exchange cavity and an air outlet cavity are sequentially arranged in the humidifying main body. A plurality of membrane tube parts are arranged in the exchange cavity. One end of each membrane tube part is communicated with the air inlet cavity, and the other end is communicated with the air outlet cavity. The exchange cavity outside the tube of each membrane tube part forms a shell section. A dry gas inlet for being communicated with a dry gas supply system is arranged on the air inlet cavity. The first flow valve and the first humidity sensor are arranged in the dry gas inlet pipeline. An air outlet after humidification is arranged on the air outlet cavity. A humidified waste gas inlet and a humidified waste gas outlet are arranged on the shell section. The second flow valve is arranged in the humidified waste gas inlet pipeline. A controller is in communication connection with the first flow valve, the first humidity sensor and the second humidity sensor. The air humidifying device can adjust the humidity according to the requirement, and ensures the normal and stable operation of the electric pile.

Description

Technical Field

[0001] This invention relates to the field of fuel cell technology, and in particular to an air humidification device. Background Technology

[0002] As a key component of the fuel cell system, the humidifier ensures that the proton exchange membrane of the fuel cell stack is in a highly efficient working state by humidifying the air entering the stack, thereby achieving high efficiency and long lifespan of the fuel cell stack.

[0003] However, most commonly used membrane humidifiers currently operate on a passive humidification model. Their humidification efficiency is constant at the rated dry air flow rate. When a vehicle is in a high-humidity environment, the dry air itself is already quite humid, but it must pass through a humidifier before entering the fuel cell stack. This means that after the already humid air is further humidified, its humidity level is no longer sufficient to meet the optimal operating requirements of the proton exchange membrane (PEM) of the fuel cell stack. Instead, this can lead to waterlogging of the PEM and consequently affect the stack's lifespan. To better meet market demands, it is essential to develop an air humidification device that can adjust the humidification effect based on the actual humidity of the air entering the fuel cell stack. Summary of the Invention

[0004] The purpose of this invention is to provide an air humidification device to solve the problems existing in the prior art, which can adjust the humidity according to the needs and ensure the normal and stable operation of the fuel cell stack.

[0005] To achieve the above objectives, the present invention provides the following solution:

[0006] This invention provides an air humidification device, comprising a humidification main body, a first flow valve, a second flow valve, a first humidity sensor, and a controller. The humidification main body has an air inlet chamber, an exchange chamber, and an exhaust chamber arranged sequentially from one end to the other. The exchange chamber is not connected to either the air inlet chamber or the exhaust chamber. Multiple membrane tubes are arranged parallel to each other within the exchange chamber. One end of each membrane tube is open and connected to the air inlet chamber, and the other end is open and connected to the exhaust chamber. The inside of each membrane tube forms a tube side, and the outside of the exchange chamber forms a shell side. A dry gas inlet is provided on the air inlet chamber, communicating with a dry gas supply system. The first flow valve and the first humidity sensor are located in the pipeline connecting the dry gas inlet and the dry gas supply system. The exhaust chamber is provided with a humidified gas outlet communicating with it, and the humidified gas outlet is used to communicate with the fuel cell stack system supply inlet; the shell side is provided with a humidified exhaust gas inlet and a humidified exhaust gas outlet communicating with it, the humidified exhaust gas inlet is used to communicate with the humidified exhaust gas outlet of the fuel cell stack system, and the second flow valve is installed in the pipeline communicating with the humidified exhaust gas inlet and the humidified exhaust gas outlet of the fuel cell stack system; the dry gas can flow sequentially through the air inlet chamber, the tube side and the exhaust chamber, and the humidified exhaust gas generated by the fuel cell stack system can flow sequentially through the humidified exhaust gas inlet, the shell side and the humidified exhaust gas outlet, and the moisture in the humidified exhaust gas can pass through the tube wall of each membrane tube and enter the tube side, and the controller is communicatively connected to the first flow valve, the first humidity sensor and the second humidity sensor.

[0007] Preferably, the bottom of the humidifying main body is also provided with a drain outlet communicating with the shell side, and a drain opening and closing device is provided on the drain outlet, which can open or close the drain outlet.

[0008] Preferably, a water level sensor is also provided inside the shell side, and the water level sensor is communicatively connected to the controller.

[0009] Preferably, it further includes a second humidity sensor, which is disposed in the connecting pipeline between the humidified gas outlet and the fuel cell stack system supply inlet, and the second humidity sensor is communicatively connected to the controller.

[0010] Preferably, the wall of the membrane tube is fixedly connected from the outside to the inside by a loose layer and a dense layer, wherein the pores of the loose layer are larger in size and fewer in number than the pores of the dense layer.

[0011] Preferably, the loose layer is made of a hydrophilic material, and the dense layer is made of a hydrophobic material.

[0012] Preferably, a macroporous layer is fixedly sandwiched between the loose layer and the dense layer. The macroporous layer has a plurality of small elongated holes, each of which is evenly distributed circumferentially around the axis of the membrane tube, and the length of each of the small elongated holes along the axis of the membrane tube is the same as the length of the loose layer and the dense layer.

[0013] Preferably, the gas flow direction from the dry gas inlet to the humidified gas outlet is opposite to the gas flow direction from the humidified waste gas inlet to the humidified waste gas outlet.

[0014] Preferably, the humidification main body includes a first end cap, a shell, a second end cap, a first sealing assembly, and a second sealing assembly. The shell is hollow inside and has a humidified exhaust gas inlet and a humidified exhaust gas outlet communicating with the interior of the shell. Each membrane tube is disposed inside the shell. The first sealing assembly is used to seal one end of the shell and leave the same-side opening of each membrane tube unsealed. The second sealing assembly is used to seal the other end of the shell and leave the same-side opening of each membrane tube unsealed. The inner wall of the shell, the side of the first sealing assembly near the second sealing assembly, the side of the second sealing assembly near the first sealing assembly, and the outer wall of each membrane tube together form the shell side. The first end cap is fixedly disposed at one end of the shell, and the inner wall of the first end cap and the side of the first sealing assembly away from the second sealing assembly together form the air inlet chamber. The first end cap is provided with a dry gas inlet. The second end cap is fixedly disposed at the other end of the shell, and the inner wall of the second end cap and the side of the second sealing assembly away from the first sealing assembly together form the exhaust chamber. The second end cap is provided with a humidified gas outlet.

[0015] Preferably, it further includes a first membrane box, which is disposed inside the housing and is fixedly connected to the housing. The first membrane box has multiple fixing slots, and multiple membrane tubes are fixed in each fixing slot.

[0016] The present invention achieves the following technical effects compared to the prior art:

[0017] The air humidification device provided by this invention monitors the humidity of the incoming air using a first humidity sensor. When the humidity reaches the required level for the fuel cell stack system, the controller closes the second flow valve, allowing the air meeting the humidity requirements to directly enter the fuel cell stack system supply inlet (stack inlet) through the membrane components and exhaust chamber. This prevents dry gas (dry air) that has already met the humidity requirements from further increasing the humidity of the fuel cell stack, which could lead to proton membrane flooding, affecting its lifespan and normal, stable operation. The controller can also control the opening of the first flow valve to regulate the flow rate of the incoming gas. When the humidity of the dry gas does not meet the required level, the controller controls the flow rates of both the first and second flow valves to regulate the degree of humidification of the incoming dry gas, ensuring that the humidity entering the fuel cell stack reaches the optimal value for the incoming air humidity.

[0018] Furthermore, the drain outlet and drain opening / closing device at the bottom of the humidification main body can promptly drain excess water remaining in the shell side, so as to avoid excessive water causing bacteria to grow inside the humidification main body, damaging the membrane tube structure, or even causing the humidification function to fail.

[0019] Furthermore, the water level sensor enables the automatic drainage of excess water within the shell side, reducing manual labor and ensuring timely drainage of liquid water from the shell side of the humidifying main component.

[0020] Furthermore, the addition of a second humidity sensor enables more precise monitoring and control of the humidity of the air entering the fuel cell stack, ensuring that the humidity of the air entering the stack meets the optimal requirements of the proton exchange membrane.

[0021] Furthermore, the membrane tube wall is composed of an outer loose layer and an inner dense layer. The pores in the loose layer are larger and fewer in number than those in the dense layer. The outer loose layer can better absorb moisture in the gas, while the dense layer can filter the moisture absorbed by the loose layer and then let it enter the membrane tube, thus ensuring that there are few moisture impurities.

[0022] Furthermore, the loose layer is made of a hydrophilic material, which allows water to adhere to the loose layer more effectively and fully, while the dense layer is made of a hydrophobic material, which allows dry gas to mix fully with the water that has permeated into the membrane tube when it flows through the membrane tube, thereby preventing the water that has permeated into the membrane tube from remaining in the membrane tube.

[0023] Furthermore, the macroporous layer reduces the resistance of moisture penetrating the sidewall of the membrane tube, while the small elongated pores can store a certain amount of water, ensuring that the moisture can always pass through the dense layer and enter the interior of the membrane tube to mix with the dry gas, thus ensuring a uniform humidification effect for the dry gas.

[0024] Furthermore, the flow direction of the dry gas into the fuel cell stack after humidification is opposite to the flow direction of the humidified exhaust gas discharged from the fuel cell stack in the shell side. This allows the moisture in the humidified exhaust gas to pass through each membrane component more fully and penetrate into the interior of the membrane component to fully wet and mix with the dry gas.

[0025] Furthermore, the humidification main body uses a shell and a first sealing assembly and a second sealing assembly at both ends to form the shell side. The first end cover and the second end cover are set at both ends of the shell to form an air inlet chamber and an exhaust chamber, respectively. Its structure is simple and easy to install.

[0026] Furthermore, the first membrane box can separate the membrane components, reduce the flow resistance of the humidified exhaust gas in the shell side, and allow the humidified exhaust gas to be more evenly distributed around each membrane component, thereby making the moisture entering the membrane component more uniform. Separating them can also increase the contact area between the humidified exhaust gas and each membrane component, improving the humidification efficiency. In addition, the first membrane box can fix the relative gap between each membrane component, ensuring the fixation effect of the membrane components. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 A schematic diagram of the air humidification device provided by the present invention;

[0029] Figure 2 This is a cross-sectional view of the air humidification device provided by the present invention;

[0030] Figure 3 A schematic diagram of the structure of the first end cap in the air humidification device provided by the present invention;

[0031] Figure 4 This is a schematic diagram of the structure of the first membrane box in the air humidification device provided by the present invention;

[0032] Figure 5 This is a schematic diagram of the structure of the housing and the first sealing assembly in the air humidification device provided by the present invention.

[0033] Figure 6 This is a schematic diagram of the tube wall structure of the membrane tube in the air humidification device provided by the present invention;

[0034] Figure 7 A schematic diagram showing the connection of the air humidification device provided by the present invention;

[0035] Figure 8 The control strategy for the drainage opening and closing device and the water level sensor in the air humidification device provided by the present invention;

[0036] Figure 9 The control strategy for the first flow valve, the first humidity sensor, and the second flow valve in the air humidification device provided by the present invention.

[0037] In the diagram: 100 - Air humidification device;

[0038] 10-First end cap; 11-Reinforcing rib; 12-Dry gas inlet; 13-Inlet chamber;

[0039] 20 - Shell; 21 - Moist exhaust gas inlet; 22 - Moist exhaust gas outlet; 23 - Reinforcing ridge;

[0040] 30 - Second end cap; 31 - Humidified gas outlet; 32 - Exhaust chamber;

[0041] 40 - Membrane fitting; 41 - Loose layer; 42 - Macroporous layer; 43 - Dense layer; 44 - Small elongated pores;

[0042] 50 - First diaphragm box; 51 - Fixing slot; 52 - Through hole; 53 - Mounting plate;

[0043] 60 - Second membrane box;

[0044] 70 - First sealing component; 71 - Potting compound; 72 - Sealing compound; 73 - Sealing ring;

[0045] 80 - Second sealing assembly;

[0046] 91-Water level sensor; 92-Drainage opening and closing device; 93-First flow valve; 94-First humidity sensor; 95-Second flow valve; 96-Second humidity sensor; 97-Third flow valve; 98-Branch pipe. Detailed Implementation

[0047] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] The purpose of this invention is to provide an air humidification device to solve the problems existing in the prior art, which can adjust the humidity according to the needs and ensure the normal and stable operation of the fuel cell stack.

[0049] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0050] Example 1

[0051] This embodiment provides an air humidification device 100, such as... Figures 1-9As shown, the device includes a humidification main body, a first flow valve 93, a second flow valve 95, a first humidity sensor 94, and a controller. The humidification main body has an inlet chamber 13, an exchange chamber, and an exhaust chamber 32 arranged sequentially from one end to the other. The exchange chamber is not connected to the inlet chamber 13 or the exhaust chamber 32. Multiple membrane tubes 40 are arranged parallel to each other within the exchange chamber. One end of each membrane tube 40 is connected to the inlet chamber 13, and the other end is connected to the exhaust chamber 32. The inside of each membrane tube 40 forms a tube side, and the exchange chamber outside each membrane tube 40 forms a shell side. A dry gas inlet 12 is provided on the inlet chamber 13, which is connected to a dry gas supply system. The first flow valve 93 and the first humidity sensor 94 are located in the pipeline connecting the dry gas inlet 12 and the dry gas supply system. The exhaust chamber 32 is provided with a humidified gas outlet 31 that communicates with the exhaust chamber 32. The humidified gas outlet 31 is used to communicate with the fuel cell stack system supply inlet. The shell side is provided with a humidified exhaust gas inlet 21 and a humidified exhaust gas outlet 22 that communicate with the shell side. The humidified exhaust gas inlet 21 is used to communicate with the humidified exhaust gas outlet of the fuel cell stack system. The second flow valve 95 is set in the pipeline that connects the humidified exhaust gas inlet 21 and the humidified exhaust gas outlet of the fuel cell stack system. The dry gas can flow through the inlet chamber 13, the tube side and the exhaust chamber 32 in sequence. The humidified exhaust gas generated by the fuel cell stack system can flow through the humidified exhaust gas inlet 21, the shell side and the humidified exhaust gas outlet 22 in sequence. The moisture in the humidified exhaust gas can pass through the tube wall of each membrane tube 40 and enter the tube side. The controller is communicatively connected to the first flow valve 93, the first humidity sensor 94 and the second humidity sensor 96. By monitoring the humidity of the incoming air through the first humidity sensor 94, when the humidity reaches the required level for the fuel cell stack system, the controller closes the second flow valve 95. This allows the air meeting the humidity requirements to directly enter the fuel cell stack system supply inlet, i.e., the stack inlet, through the membrane fittings 40 and the exhaust chamber 32. This prevents dry gas (dry air) that has already met the humidity requirements from further increasing the humidity of the stack, which could lead to flooding of the proton exchange membrane and affect its lifespan and normal, stable operation. The controller can also control the opening of the first flow valve 93 to control the flow rate of the incoming gas. When the humidity of the dry gas does not meet the required level for the stack, the controller controls the flow rate of the first flow valve 93 and the second flow valve 95 to control the degree of humidification of the incoming dry gas, ensuring that the humidity entering the stack reaches the optimal value for the incoming air humidity.

[0052] Specifically, the controller can be a separate unit used to connect and control the first flow valve 93, the first humidity sensor 94, the second flow valve 95, and the second humidity sensor 96, or it can be an existing ECU on the equipment, such as the engine ECU.

[0053] Specifically, since liquid water may accumulate in the shell side of the humidification main body, a branch pipe 98 can be installed at the dry gas inlet 12. A third flow valve 97 is installed on the branch pipe 98, and the other end of the branch pipe 98 is directly connected to the fuel cell stack system supply inlet, i.e., the stack inlet. The controller is communicatively connected to the third flow valve 97. When the humidity of the dry gas does not reach the stack inlet humidity, the controller controls the third flow valve 97 to be closed. When the humidity of the dry gas reaches the stack inlet humidity, the first flow valve 93 is used to control the flow rate of the dry gas entering the air inlet chamber 13. The controller can control the first flow valve 93 to close and the third flow valve 97 to open, so that the dry gas that meets the stack inlet humidity requirements is directly supplied to the fuel cell stack system through the branch pipe 98. This avoids the situation where residual moisture in the membrane components 40 inside the humidification main body is further humidified to meet the stack inlet humidity requirements, thus preventing the dry gas from being further humidified.

[0054] Specifically, such as Figure 7 As shown, the humid exhaust gas outlet 22 is connected to the tail exhaust system and discharged after being treated by the tail exhaust system.

[0055] Specifically, the controller's control strategy for the first flow valve, second flow valve, first humidity sensor, and third flow valve, depending on whether the incoming dry gas is humidified or directly introduced into the fuel cell system, is as follows: Figure 9 As shown.

[0056] Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 2 and Figure 7 As shown, the bottom of the humidification main body is also provided with a drain port that communicates with the shell side. A drain opening and closing device 92 is provided on the drain port, which can open or close the drain port. The drain port and drain opening and closing device 92 at the bottom of the humidification main body can timely drain excess water remaining in the shell side, so as to avoid excessive water causing bacteria to grow inside the humidification main body and damage the membrane tube 40 structure, or even cause the humidification function to fail.

[0057] Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 2 and Figure 7 and Figure 8 As shown, a water level sensor 91 is also installed inside the shell side. Both the water level sensor 91 and the drainage opening and closing device 92 are communicatively connected to the controller. The water level sensor 91 enables the automatic drainage of excess water inside the shell side, reducing manual labor and ensuring the timely drainage of liquid water inside the shell side of the humidifying main unit. The specific control strategy is as follows: Figure 8 As shown, the water level signals are all monitored by the water level sensor 91 and provided to the controller at all times.

[0058] Specifically, the water level sensor 91 can detect the water level depth and transmit the water level depth signal to the controller. The controller can compare the received water level depth signal with the set limit and then control the drainage opening and closing device 92 to automatically open or close the drainage. For example, when the received water level depth reaches or exceeds the set limit, the controller controls the drainage opening and closing device 92 to automatically open the drainage.

[0059] Specifically, the drain opening and closing device 92 is an existing component, such as patent CN202221142858.8, or it can be other simpler components or devices that can control the opening and closing of the drain outlet and the flow rate.

[0060] Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 7 As shown, the air humidification device 100 also includes a second humidity sensor 96. The second humidity sensor 96 is installed in the connecting pipe between the humidified gas outlet 31 and the fuel cell stack system supply inlet, and is communicatively connected to the controller. The second humidity sensor 96 enables more precise monitoring and control of the humidity of the air entering the stack, ensuring that the humidity of the air entering the stack meets the optimal requirements of the proton exchange membrane.

[0061] Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 6 As shown, the wall of the membrane fitting 40 is fixedly connected from the outside to the inside by a loose layer 41 and a dense layer 43. The pores in the loose layer 41 are larger and fewer in number than those in the dense layer 43. The wall of the membrane fitting 40 is composed of an outer loose layer 41 and an inner dense layer 43. The pores in the loose layer 41 are larger and fewer in number than those in the dense layer 43. The outer loose layer 41 can better absorb moisture in the gas, while the dense layer 43 can filter the moisture absorbed by the loose layer 41 and allow it to enter the membrane fitting 40, thus ensuring that there are few moisture impurities.

[0062] In this embodiment, a preferred option is that the loose layer 41 is made of a hydrophilic material, and the dense layer 43 is made of a hydrophobic material. The use of a hydrophilic material in the loose layer 41 allows moisture to adhere more effectively and fully to the loose layer 41, while the use of a hydrophobic material in the dense layer 43 allows the dry gas to mix fully with the moisture that has permeated into the membrane tube 40 when it flows through it, thereby preventing the moisture that has permeated into the membrane tube 40 from remaining inside the membrane tube 40.

[0063] Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 6As shown, a macroporous layer 42 is fixedly sandwiched between the loose layer 41 and the dense layer 43. The macroporous layer 42 has multiple small elongated holes 44, which are evenly distributed circumferentially around the axis of the membrane tube 40. The length of each small elongated hole 44 along the axis of the membrane tube 40 is the same as the length of the loose layer 41 and the dense layer 43. The macroporous layer 42 reduces the resistance of moisture penetrating the sidewall of the membrane tube 40, and the small elongated holes 44 can store a certain amount of water, ensuring that moisture can always pass through the dense layer 43 and enter the interior of the membrane tube 40 to mix with the dry gas, thus ensuring a uniform humidification effect of the dry gas.

[0064] Specifically, the walls of the small elongated pores 44 in the macroporous layer 42 are micropores, and these micropores are connected to the pores of the loose layer 41 and the dense layer 43.

[0065] Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 1 and Figure 2 As shown, the gas flow direction from the dry gas inlet 12 to the humidified gas outlet 31 is opposite to the gas flow direction from the humidified exhaust gas inlet 21 to the humidified exhaust gas outlet 22. The flow direction of the humidified dry gas flowing into the fuel cell stack is opposite to the flow direction of the humidified exhaust gas discharged from the fuel cell stack in the shell side. This allows the moisture in the humidified exhaust gas to pass more fully through each membrane element 40 and penetrate into the interior of the membrane element 40 to fully wet and mix with the dry gas.

[0066] Among the optional solutions in this embodiment, the more preferred one is as follows: Figures 1 to 7As shown, the humidification main body includes a first end cap 10, a housing 20, a second end cap 30, a first sealing assembly 70, and a second sealing assembly 80. The housing 20 is hollow inside and has a humidified exhaust gas inlet 21 and a humidified exhaust gas outlet 22 communicating with the interior of the housing 20. Each membrane tube 40 is disposed inside the housing 20. The first sealing assembly 70 is used to seal one end of the housing 20 and leave the same-side end opening of each membrane tube 40 unsealed. The second sealing assembly 80 is used to seal the other end of the housing 20 and leave the same-side end opening of each membrane tube 40 unsealed. The inner wall of the housing 20 and the first sealing assembly 70 are close to the second sealing assembly. One side of the housing 20, the side of the second sealing assembly 80 near the first sealing assembly 70, and the outer walls of each membrane tube 40 together form the shell side. The first end cap 10 is fixedly installed at one end of the housing 20, and the inner wall of the first end cap 10 and the side of the first sealing assembly 70 away from the second sealing assembly 80 together form the air inlet chamber 13. The first end cap 10 is provided with a dry gas inlet 12. The second end cap 30 is fixedly installed at the other end of the housing 20, and the inner wall of the second end cap 30 and the side of the second sealing assembly 80 away from the first sealing assembly 70 together form the exhaust chamber 32. The second end cap 30 is provided with a humidified gas outlet 31. The humidification main body uses the housing 20 and the first sealing assembly 70 and the second sealing assembly 80 at both ends to form the shell side. The first end cap 10 and the second end cap 30 are set at both ends of the housing 20 to form the air inlet chamber 13 and the exhaust chamber 32, respectively. Its structure is simple and easy to install.

[0067] Specifically, the first end cap 10 and the second end cap 30 are structurally symmetrical. Taking the first end cap 10 as an example, multiple reinforcing ribs 11 are also provided on the inner wall of the first end cap 10. Each reinforcing rib 11 is arranged in a direction close to or far from the dry gas inlet 12, such as... Figure 3 As shown, the reinforcing rib 11 in the middle position is wider. Here, the width refers to the direction of the airflow that is blocked from entering from the dry gas inlet 12. Therefore, the reinforcing rib 11 can not only improve the strength of the first end cap 10, but also block the flow of dry gas so that the dry gas passes through each membrane tube 40 as evenly as possible, thereby improving the uniformity of the dry gas flow field distribution.

[0068] Specifically, the first sealing component 70 and the second sealing component 80 have the same components and are symmetrically arranged at both ends of the housing 20. Taking the first sealing component 70 as an example, it includes potting compound 71, sealant 72 and sealing ring 73 arranged from the inside to the outside. The potting compound 71 is disposed inside the port of the housing 20 outside the outer wall of each membrane tube 40; the sealing ring 73 is disposed on the port of the housing 20; the sealant 72 is disposed between the potting compound 71 and the sealing ring 73, and is used to seal and connect the potting compound 71 and the sealing ring 73.

[0069] Specifically, the inner wall of the housing 20 for connecting with the potting compound 71 is also provided with reinforcing ridges 23 or grooves to ensure the firmness of the connection between the housing 20 and the potting compound 71.

[0070] Specifically, before potting the shell 20 with potting compound 71, a molecular chain activator is applied to the potting area to allow the molecular chains of the shell 20 and the potting compound 71 to fuse during potting, thereby improving the potting strength and firmness.

[0071] Specifically, the potting compound 71 is made of polyurethane or high-temperature resistant epoxy resin, and the potting method of the potting compound 71 can be centrifugal potting or static potting.

[0072] Specifically, the material of sealant 72 is silicone rubber.

[0073] Specifically, the material of the sealing ring 73 is one of silicone rubber, HNBR or FVM.

[0074] Among the optional solutions in this embodiment, the more preferred one is as follows: Figures 1-4 As shown, the air humidification device 100 also includes a first membrane box 50, which is disposed inside the housing 20 and fixedly connected to the housing 20. The first membrane box 50 has multiple fixing slots 51, each of which is used to fix multiple membrane tubes 40. The first membrane box 50 can separate the membrane tubes 40, reduce the flow resistance of the humidified exhaust gas in the housing, and allow the humidified exhaust gas to be more evenly distributed around each membrane tube 40, thereby making the moisture entering the membrane tubes 40 more uniform. Furthermore, separating them can increase the contact area between the humidified exhaust gas and each membrane tube 40, improving the humidification efficiency. The first membrane box 50 can also fix the relative gap between each membrane tube 40, ensuring the fixation effect of the membrane tubes 40.

[0075] Specifically, the fixed through groove 51 is a through hole running from front to back, and the extension direction of the membrane tube 40 is the same as the extension direction of the fixed through groove 51.

[0076] Specifically, each fixed through groove 51 has a through hole 52 on its side wall. Specifically, each of the two side walls of the fixed through groove 51 has a through hole 52.

[0077] Specifically, it also includes a second diaphragm box 60, which is disposed opposite to the first diaphragm box 50 at both ends inside the housing 20. The outer side wall of the membrane tube 40 near the first diaphragm box 50 is fixedly connected to the first diaphragm box 50 and the housing 20 by potting compound 71. The outer side wall of the second diaphragm box 60 and the membrane tube 40 near the second diaphragm box 60 and the housing 20 are also fixedly connected by potting compound 71.

[0078] Specifically, the first diaphragm box 50 and the second diaphragm box 60 are provided with mounting plates 53 for connecting to the housing 20. The first diaphragm box 50 and the second diaphragm box 60 have the same structure and are symmetrically arranged at both ends of the housing 20. Taking the first diaphragm box 50 as an example, the mounting plate 53 on the first diaphragm box 50 is located on the side closer to the second diaphragm box 60, and the mounting plate 53 on the first diaphragm box 50 is located on the side of the humid exhaust gas outlet 22 on the housing 20 closer to the humid exhaust gas inlet 21. The mounting plates 53 on the first diaphragm box 50 and the second diaphragm box 60 are fixedly connected to the housing 20 by hot riveting or bolts.

[0079] Specifically, such as Figure 1 As shown, after entering the housing 20 from the wet exhaust gas inlet 21, the wet exhaust gas first passes through the through hole 52 on the second membrane box 60 that communicates with the fixed through groove 51, then enters the fixed through groove 51 and then enters the shell side inside the housing 20. It then flows through each fixed through groove 51 on the first membrane box 50 and is discharged from the wet exhaust gas outlet 22 through the through hole 52 on each fixed through groove 51 and part of the internal cavity of the housing 20.

[0080] Specifically, in order to ensure that the humid exhaust gas can flow uniformly in the through holes 52 of each fixed channel 51, the size of the through holes 52 on each fixed channel 51 can be set to gradually decrease in the direction away from the humid exhaust gas inlet 21, so as to ensure that the uniformity coefficient of the humid exhaust gas in each fixed channel 51 is basically the same.

[0081] Specifically, multiple horizontal partitions and multiple vertical partitions are fixedly installed inside the housing 20. The horizontal partitions and vertical partitions are fixedly separated to form multiple partition slots. The number and size of the partition slots are the same as the number and size of the fixed slots 51 on the first diaphragm box 50 and the second diaphragm box 60.

[0082] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. An air humidification device, characterized in that: Includes the main humidification component, a first flow valve, a second flow valve, a first humidity sensor, and a controller. The humidification main body has an air inlet chamber, an exchange chamber, and an exhaust chamber arranged sequentially from one end to the other. The exchange chamber is not connected to the air inlet chamber or the exhaust chamber. Multiple membrane tubes are arranged in parallel within the exchange chamber. One end of each membrane tube is connected to the air inlet chamber, and the other end of each membrane tube is connected to the exhaust chamber. The inside of each membrane tube forms a tube side, and the outside of each membrane tube forms a shell side. The air intake chamber is provided with a dry gas inlet that communicates with the air intake chamber. The dry gas inlet is used to communicate with the dry gas supply system, and the first flow valve and the first humidity sensor are arranged in the pipeline that communicates with the dry gas inlet and the dry gas supply system. The exhaust chamber is provided with a humidified gas outlet that communicates with the exhaust chamber, and the humidified gas outlet is used to communicate with the fuel cell stack system supply inlet; The shell side is provided with a humid exhaust gas inlet and a humid exhaust gas outlet communicating with the shell side. The humid exhaust gas inlet is used to communicate with the humid exhaust gas outlet of the fuel cell stack system, and the second flow valve is provided in the pipeline communicating with the humid exhaust gas inlet and the humid exhaust gas outlet of the fuel cell stack system. Dry gas can flow sequentially through the inlet chamber, the tube side and the exhaust chamber. Moist exhaust gas generated by the fuel cell stack system can flow sequentially through the moist exhaust gas inlet, the shell side and the moist exhaust gas outlet, and the moisture in the moist exhaust gas can pass through the tube wall of each membrane component and enter the tube side. It also includes a second humidity sensor, which is installed in the connecting pipe between the humidified gas outlet and the fuel cell stack system supply inlet; The membrane tube wall is fixedly connected from the outside to the inside by a loose layer and a dense layer. The pores in the loose layer are larger in size and fewer in number than the pores in the dense layer. The porous layer is made of a hydrophilic material, and the dense layer is made of a hydrophobic material. A macroporous layer is also fixedly sandwiched between the loose layer and the dense layer. The macroporous layer has a plurality of small elongated holes, each of which is evenly distributed circumferentially around the axis of the membrane tube, and the length of each of which is the same as the length of the loose layer and the dense layer along the axis of the membrane tube. The gas flow direction from the dry gas inlet to the humidified gas outlet is opposite to the gas flow direction from the humidified exhaust gas inlet to the humidified exhaust gas outlet. The controller is communicatively connected to the first flow valve, the first humidity sensor, and the second humidity sensor.

2. The air humidification device according to claim 1, characterized in that: The bottom of the humidifying main body is also provided with a drain outlet that communicates with the shell side. A drain opening and closing device is provided on the drain outlet, which can open or close the drain outlet.

3. The air humidification device according to claim 2, characterized in that: A water level sensor is also installed inside the shell side, and the water level sensor is communicatively connected to the controller.

4. The air humidification device according to claim 1, characterized in that: The humidification main component includes a first end cap, a housing, a second end cap, a first sealing assembly, and a second sealing assembly. The housing is hollow inside and has a humidified exhaust gas inlet and an exhaust gas outlet communicating with the interior of the housing. Each membrane component is disposed within the housing. A first sealing assembly seals one end of the housing while leaving the openings on the same side of each membrane component unsealed. A second sealing assembly seals the other end of the housing while leaving the openings on the same side of each membrane component unsealed. The inner wall of the housing, the side of the first sealing assembly near the second sealing assembly, the side of the second sealing assembly near the first sealing assembly, and the outer walls of each membrane component together form the shell side. The first end cap is fixedly disposed at one end of the housing, and the inner wall of the first end cap and the side of the first sealing assembly away from the second sealing assembly together form the air inlet chamber. The first end cap is provided with the dry gas inlet. The second end cap is fixedly disposed at the other end of the housing, and the inner wall of the second end cap and the side of the second sealing assembly away from the first sealing assembly together form the exhaust chamber. The second end cap is provided with the humidified gas outlet.

5. The air humidification device according to claim 4, characterized in that: It also includes a first membrane box, which is disposed inside the housing and is fixedly connected to the housing. The first membrane box has multiple fixing slots, and multiple membrane tubes are fixed in each fixing slot.

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