Vehicle air conditioning system

Abstract

The present application provides a kind of air conditioning system for vehicle, which can reduce the possibility of water remaining in the channel from the adsorption material, so as to reduce the possibility of the water being introduced into the cabin.The air conditioning system for vehicle is provided with humidity control equipment (2) and channel (3), the inside of the channel (3) is configured with humidity control equipment (2), air (10) from the cabin of vehicle or outside the vehicle can flow through, the end surface of humidity control equipment (2) is provided with flow resistance part (22) and flow allowing part (23), the flow resistance part (22) is arranged in the outer peripheral part of end surface and hinders the flow of air (10), and the flow allowing part (23) is arranged in the inner side of flow resistance part (22) and allows the flow of air (10), when observing the end surface of humidity control equipment (2) in the channel (3) from the downstream side of the flow direction of air (10), the maximum width W of flow resistance part (22) is less than or equal to 10 mm.

Description

Technical Field

[0001] This invention relates to air conditioning systems for vehicles. Background Technology

[0002] In automobiles and other vehicles, the demand for improving the cabin environment is increasing. Specific needs include: reducing carbon dioxide levels to combat driver drowsiness, regulating cabin humidity, and removing harmful volatile components such as odors and allergens. Ventilation is an effective solution to these needs; however, ventilation is a major cause of significant energy loss from heaters in winter, leading to reduced energy efficiency. In particular, battery electric vehicles (BEVs) suffer from a substantial reduction in driving range due to energy loss.

[0003] Patent Document 1 discloses an air conditioning system comprising: an adsorption section (heater component) having an adsorption layer (including a functional material layer) containing an adsorption material (moisture-absorbing material); and an outlet pipe having a first flow path (first path) connecting the outlet end face of the adsorption section to an indoor space and a second flow path (second path) connecting the outlet end face of the adsorption section to an outdoor space such as an exterior of a vehicle. Patent Document 1 also discloses a method of clamping the adsorption section from both sides using a frame.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2024-144204 Summary of the Invention

[0007] When moisture is detached from the adsorbent material in the adsorption section, the adsorption section is heated using a heating mechanism, and the air containing moisture is discharged outside the vehicle. Conversely, when moisture is adsorbed onto the adsorbent material, the heating of the adsorption section is stopped, and dehumidified air flows into the passenger compartment. If moisture detached from the adsorbent material remains in the passageway, moisture may be introduced into the passenger compartment when dehumidified air flows in, potentially increasing the humidity inside the compartment.

[0008] The present invention was implemented to solve the problems described above, and one of its objectives is to provide an air conditioning system for vehicles that can reduce the possibility of moisture detached from self-adsorbing materials remaining in the channel, thereby reducing the possibility of such moisture being introduced into the passenger compartment.

[0009] The inventors of this invention have conducted in-depth research on air conditioning systems for vehicles equipped with humidification devices, resulting in the following new insights. Specifically, humidification devices sometimes have a flow-obstructing portion, arranged in a strip shape on the outer periphery of the end face, that obstructs airflow, and a flow-allowing portion, arranged inside the flow-obstructing portion, that allows airflow. If the maximum width of the flow-obstructing portion is large when viewed from the downstream side of the airflow direction, air stagnation occurs at the downstream end face of the adsorption portion, and moisture detached from the adsorption material easily remains in the channel. Therefore, it has been found that by controlling the maximum width of the flow-obstructing portion within a specified range, the above-mentioned problem can be solved. This invention is based on such insights.

[0010] [1] In one embodiment of the present invention, therein is an air conditioning system for a vehicle, comprising: a humidification device having an adsorption section and a heating mechanism capable of heating the adsorption section, the adsorption section containing an adsorption material that adsorbs moisture below a predetermined temperature and is capable of removing the adsorbed moisture when the predetermined temperature is exceeded; and a channel, the humidification device being disposed inside the channel for air circulation from the vehicle compartment or outside the vehicle, and the channel having a first flow path for air to flow into the vehicle compartment and a second flow path for air to be discharged outside the vehicle on the downstream side of the humidification device, and a flow obstruction section that is arranged in a strip shape on the outer periphery of the end face to obstruct the air circulation and a flow allowance section that is arranged on the inner side of the flow obstruction section to allow the air circulation, wherein when the end face of the humidification device in the channel is viewed from the downstream side in the direction of air flow, the maximum width of the flow obstruction section is 10 mm or less.

[0011] [2] Based on the vehicle air conditioning system described in the first item, the present invention can be: the maximum width of the flow obstruction part is 9 mm or less.

[0012] [3] Based on the vehicle air conditioning system described in the first or second item, the present invention may be: the humidification device further comprises a frame that clamps the adsorption part from both sides in the direction of air flow, and the flow obstruction part is at least partially formed by the frame.

[0013] [4] Based on the vehicle air conditioning system described in any one of the first to third claims of the present invention, the adsorption unit may include: a honeycomb structure having an outer wall and a partition wall, the partition wall being disposed on the inner side of the outer wall and dividing to form a compartment, the compartment forming a flow path for the air extending from a first end face to a second end face; and an adsorption layer containing the adsorption material and disposed on the surface of the partition wall, the heating mechanism including a pair of electrodes connected to the honeycomb structure, through which current flows through the honeycomb structure to heat the honeycomb structure, and at least the partition wall of the honeycomb structure being made of a material having PTC properties.

[0014] Invention Effects

[0015] According to one embodiment of the vehicle air conditioning system of the present invention, since the maximum width of the flow obstruction portion when viewed from the downstream side of the air flow direction at the end face of the humidification device in the channel is less than 10 mm, the possibility of moisture detached from the self-adsorbing material remaining in the channel can be reduced, thereby reducing the possibility of such moisture being introduced into the passenger compartment. Attached Figure Description

[0016] Figure 1 This is a schematic diagram illustrating an air conditioning system for a vehicle according to an embodiment of the present invention.

[0017] Figure 2 To show in more detail Figure 1 An exterior view of the humidity control equipment.

[0018] Figure 3 It is shown Figure 2 A diagram illustrating the impact of the maximum width W of the flow obstruction section.

[0019] Figure 4 It is shown Figure 2 An external view of a modified example of a humidity control device.

[0020] Figure 5 It is shown Figure 1 The front view of the humidity control equipment.

[0021] Figure 6 It is shown Figure 5 Right view of the humidification equipment.

[0022] Figure 7 It is Figure 5 The enlarged view of region VII is shown.

[0023] Figure 8 It is shown in Figure 5 A 3D view of the frame's state has been added to the humidity control equipment.

[0024] Figure 9 yes Figure 8 An exploded 3D view of the humidity control equipment.

[0025] Figure 10 This is an explanatory diagram showing the setup of a sample of the humidity control device in the embodiment.

[0026] Figure 11 This is an explanatory diagram showing another configuration of the humidification device in the embodiment.

[0027] Explanation of reference numerals in the attached figures

[0028] 1: Vehicle air conditioning system; 2: Humidification equipment; 3: Channel; 10: Air; 10a: Moisture; 20: Adsorption section; 21: Heating mechanism; 22: Flow obstruction section; 23: Flow allowance section; 31: First flow path; 32: Second flow path; 90: Honeycomb structure; 90a: First end face; 90b: Second end face; 91: Adsorption layer; 92: Electrode; 93: Electrode; 96: Frame; 900: Outer wall; 901: Partition wall. Detailed Implementation

[0029] Hereinafter, specific embodiments will be described with reference to the accompanying drawings. The present invention is not limited to each embodiment, and can be embodied by modifying the constituent elements without departing from its spirit. Furthermore, various inventions can be formed by appropriately combining the multiple constituent elements disclosed in each embodiment. For example, several constituent elements can be deleted from all the constituent elements given in the embodiments. In addition, constituent elements from different embodiments can be appropriately combined.

[0030] (1. Regarding vehicle air conditioning systems)

[0031] Figure 1 This is a schematic diagram illustrating a vehicle air conditioning system 1 according to an embodiment of the present invention. The vehicle air conditioning system 1 of this embodiment is a system mounted on a vehicle. The vehicle is not particularly limited, and examples include automobiles and electric vehicles. The automobile is not particularly limited, and examples include gasoline vehicles, diesel vehicles, gas-fueled vehicles using CNG (compressed natural gas) or LNG (liquefied natural gas), fuel cell vehicles, electric vehicles, and plug-in hybrid electric vehicles. The vehicle air conditioning system 1 according to the embodiment of the present invention is preferably used, particularly in vehicles without an internal combustion engine, such as electric vehicles and electric vehicles.

[0032] like Figure 1 As shown, the vehicle air conditioning system 1 has a humidification device 2 and a passage 3.

[0033] The humidity control device 2 includes an adsorption section 20 and a heating mechanism 21. The adsorption section 20 contains an adsorption material that adsorbs moisture below a specified temperature and releases the adsorbed moisture when the specified temperature is exceeded. The heating mechanism 21 is configured to heat the adsorption section 20. By heating the adsorption section 20 using the heating mechanism 21, moisture is released from the adsorption material in the adsorption section 20.

[0034] Channel 3 is a pipe body internally equipped with humidification device 2. Channel 3 is configured to allow air 10 from the vehicle compartment or outside the vehicle to circulate. Channel 3 has a first flow path 31 and a second flow path 32 downstream of humidification device 2. The first flow path 31 is for allowing air 10 that has passed through humidification device 2 to flow into the vehicle compartment. The second flow path 32 is for allowing air 10 that has passed through humidification device 2 to exit outside the vehicle. The first flow path 31 and the second flow path 32 are separated from each other by channel partition 33. Although not shown, the first flow path 31 and the second flow path 32 can be arranged with a gap between them.

[0035] The vehicle air conditioning system 1 may further include a valve 4, a blower 5, and a control unit 6.

[0036] Valve 4 is configured to switch the flow of air 10 through channel 3 between the first flow path 31 and the second flow path 32. Valve 4 can allow air 10 to flow into the first flow path 31 when moisture in the air 10 is adsorbed onto the humidification device 2, and allow air 10 to flow into the second flow path 32 when moisture is removed from the humidification device 2. Figure 1 The diagram shows the state in which air 10 flows into the first flow path 31. As for valve 4, any electrically driven valve with the function of switching flow paths is acceptable; there are no particular limitations, however, examples include solenoid valves and electric valves. In one embodiment, valve 4 includes: an opening / closing gate 41 supported on a rotating shaft 40, and an actuator 42 such as a motor for rotating the rotating shaft 40.

[0037] The blower 5 is configured to supply air 10 to the humidification device 2. The blower 5 can be installed inside the channel 3. The blower 5 can be positioned upstream of the humidification device 2 in the direction of air 10 flow.

[0038] The control unit 6 is configured to control the humidification device 2, valve 4, and blower 5. The control unit 6 can be electrically connected to the humidification device 2, valve 4, and blower 5 via wired or wireless means. The control modes of the control unit 6 may include: an adsorption mode in which the blower 5 is started without activating the heating mechanism 21 to allow air 10 to flow into the first flow path 31, and a regeneration mode in which the blower 5 and the heating mechanism 21 are started to allow air 10 to flow into the second flow path 32.

[0039] The outlet of the first flow path 31 can be configured to face the HVAC inlet 70 of the HVAC unit 7. The outlet of the second flow path 32 can be configured to be offset from the HVAC inlet 70. The HVAC unit 7 is a unit for heating, ventilation, and air conditioning in the vehicle. The HVAC unit 7 can deliver air 10 introduced from the HVAC inlet 70 to the passenger compartment. It is designed to supply the passenger compartment with the air 10 flowing through the first flow path 31 via the HVAC unit 7, and to exhaust the air 10 flowing through the second flow path 32 to the outside of the vehicle without passing through the HVAC unit 7.

[0040] Next, Figure 2 To show in more detail Figure 1 An exterior view of the humidity control device 2. Figure 2 (a) is from Figure 1 A front view of the humidification device 2 when observing the humidification device 2 in the downstream side of the airflow direction 10 within the channel 3. Figure 2 (b) is a cross-sectional view of the humidification device 2 and channel 3 along line A-A of (a). Figure 2 As shown in (a), the end face of the humidification device 2 is provided with a flow obstruction section 22, which is arranged in a strip shape on the outer periphery of the end face to obstruct the flow of air 10, and a flow allowance section 23, which is arranged inside the flow obstruction section 22 to allow the flow of air 10. As the air 10 passes through the flow allowance section 23, the moisture in the air 10 can be adsorbed onto the adsorption material.

[0041] In the vehicle air conditioning system 1 of this embodiment, like Figure 2 When viewing the end face of the humidification device 2 within the channel 3 from the downstream side in the airflow direction of the air 10, as shown in (a), the maximum width W of the flow obstruction portion 22 is set to 10 mm or less. As described above, the flow obstruction portion 22 extends in a strip shape in the circumferential direction of the adsorption portion 20. The direction in which the flow obstruction portion 22 extends in a strip shape is defined as the length direction LD of the flow obstruction portion 22, and the direction orthogonal to the length direction LD for each part of the flow obstruction portion 22 is defined as the width direction WD. For example, Figure 2 On the right side of (a), the portion extending vertically from the flow obstruction portion 22 has a width direction WD in the left-right direction. Additionally, Figure 2 The portion extending to the left and right of the flow obstruction portion 22 on the upper side of (a) has a width direction WD in the vertical direction. The maximum width W is set as the maximum dimension in the width direction WD of the flow obstruction portion 22 that appears inside the channel 3. Figure 2 In the style, the maximum width W is the distance in the width direction WD between the inner peripheral surface 3a of the channel 3 and the inner end 20a of the flow obstruction part 22.

[0042] Figure 2 In the illustrated configuration, the humidification device 2 is arranged inside the channel 3 such that the outer end 20b of the flow obstruction portion 22 is located inside the inner peripheral surface 3a of the channel 3. In this case, by making the flow obstruction portion 22 smaller, the maximum width W of the flow obstruction portion 22 can be set to 10 mm or less.

[0043] Next, Figure 3 It is shown Figure 2 A diagram illustrating the impact of the maximum width W of the flow obstruction section 22. Figure 3 The humidity control device 2 shown has a higher efficiency than... Figure 2 The maximum width W of the flow obstruction section 22 of the humidity control device 2 shown. For example... Figure 3 As shown in the center, in regeneration mode, the adsorption section 20 is heated by the heating mechanism 21, and the air 10 containing moisture is circulated through the second flow path 32, and the air 10 is discharged outside the vehicle. On the other hand, as Figure 3 As shown on the right, in adsorption mode, the heating mechanism 21 stops heating the adsorption section 20, allowing the dehumidified air 10 to circulate in the first flow path 31 and be introduced into the carriage.

[0044] If like Figure 3 If the maximum width W of the flow obstruction section 22 in the humidity control device 2 shown is large, air 10 will be trapped at the downstream end face of the adsorption section 20. Moisture 10a detached from the adsorption material is more likely to remain in the channel 3. When the dehumidified air 10 flows into the passenger compartment in adsorption mode, the moisture 10a is introduced into the passenger compartment, potentially increasing the humidity. In the vehicle air conditioning system 1 of this embodiment, by setting the maximum width W of the flow obstruction section 22 to 10 mm or less, the trapping of air 10 at the downstream end face of the adsorption section 20 can be reduced. This reduces the likelihood of moisture 10a detached from the adsorption material remaining in the channel 3, thereby reducing the possibility of this moisture being introduced into the passenger compartment. The maximum width W of the flow obstruction section 22 is more preferably 9 mm or less, and even more preferably 5 mm or less.

[0045] In regeneration mode, the adsorption section 20 is heated using the heating mechanism 21. Therefore, the air 10 containing moisture 10a is warm, and this moisture-containing air 10 tends to linger in the upper part of the downstream side of the adsorption section 20. To reliably reduce such lingering of air 10, it is particularly preferable to set the maximum width W of the flow obstruction section 22 at the upper part of the end face as described above.

[0046] Next, Figure 4 It is shown Figure 2 An external view of a modified example of the humidity control device 2. Figure 4 (a) is from Figure 1A front view of the humidification device 2 when observing the humidification device 2 in the downstream side of the airflow direction 10 within the channel 3. Figure 4 (b) is a cross-sectional view of the humidity control device 2 and channel 3 along line B-B of (a).

[0047] like Figure 4 As shown, the humidity control device 2 can be arranged inside the channel 3 with the outer end 20b of the flow obstruction part 22 located outside the channel 3. In this case, by adjusting the positional relationship between the inner end 20a of the flow obstruction part 22 and the inner peripheral surface 3a of the channel 3, the maximum width W of the flow obstruction part 22 can be set to 10 mm or less. Figure 4 In the pattern shown, the inner end 20a of the flow obstruction part 22 and the inner peripheral surface 3a of the channel 3 are in the same position, and the maximum width W of the flow obstruction part 22 is actually 0mm.

[0048] (2. About humidity control equipment)

[0049] Next, Figure 5 It is shown Figure 1 The front view of the humidification device 2. Figure 6 It is shown Figure 5 Right view of the humidification device 2 Figure 7 It is Figure 5 The enlarged view of region VII is shown.

[0050] like Figures 5-7 As shown, the adsorption section 20 of the humidity control device 2 in this embodiment has a honeycomb structure 90 and an adsorption layer 91. The honeycomb structure 90 has an outer wall 900 and a partition wall 901. The partition wall 901 is disposed on the inner side of the outer wall 900 and divides the space into compartments 901a. The compartments 901a form a flow path for air 10 extending from the first end face 90a to the second end face 90b. The adsorption layer 91 is a layer containing the aforementioned adsorption material, such as... Figure 7 The shown material is disposed on the surface of the partition 901. Air 10 flows through the compartment 901a between the first end face 90a and the second end face 90b, causing the moisture in the air 10 to be adsorbed onto the adsorbent material of the adsorption layer 91.

[0051] In a humidity control device 2 like this, the heating mechanism 21 has a pair of electrodes 92 and 93 connected to the honeycomb structure 90. Current flows through the honeycomb structure 90 through the pair of electrodes 92 and 93, thereby heating the honeycomb structure 90. Hereinafter, when referring to the pair of electrodes 92 and 93, one will be called the first electrode 92 and the other will be called the second electrode 93.

[0052] like Figure 6Specifically, the first electrode 92 is disposed on the first end face 90a of the honeycomb structure 90, and the second electrode 93 is disposed on the second end face 90b of the honeycomb structure 90. The first electrode 92 and the second electrode 93 are disposed on the end face of the outer wall 900, and, as shown... Figure 7 The first electrode 92 and the second electrode 93 are shown disposed on the end face of the partition 901. The first electrode 92 and the second electrode 93 do not enclose the compartment 901a. However, a portion of the compartment 901a may be enclosed by the first electrode 92 and / or the second electrode 93.

[0053] like Figure 5 and Figure 6 As shown, a first metal terminal 94 can be provided on the first electrode 92, and a second metal terminal 95 can be provided on the second electrode 93. The first metal terminal 94 and the second metal terminal 95 are rectangular annular bodies mounted on the outer periphery of the first end face 90a and the second end face 90b, respectively. The first metal terminal 94 and the second metal terminal 95 are provided with protrusions extending from the rectangular frame to the outer side of the honeycomb structure 90 in the width direction.

[0054] A positive terminal (not shown) of a power source is connected to the protrusion of either the first metal terminal 94 or the second metal terminal 95, and a negative terminal of the power source is connected to the protrusion of the other metal terminal 95. If the protrusion of the first metal terminal 94 is connected to the positive terminal and the protrusion of the second metal terminal 95 is connected to the negative terminal, the current from the first metal terminal 94 propagates through the first electrode 92 on the first end face 90a, flows through the honeycomb structure 90 in the direction extending from the compartment 901a, and flows through the second electrode 93 on the second end face 90b to the second metal terminal 95. This current flow causes the honeycomb structure 90 to be uniformly heated. The flow obstruction portion 22 may be at least partially formed by the aforementioned first metal terminal 94 and second metal terminal 95.

[0055] At least the partitions 901 of the honeycomb structure 90 may be made of a material with PTC (Positive Temperature Coefficient) properties. Materials with PTC properties have the following characteristics: when the temperature rises above the Curie point, the resistance increases sharply, making it difficult for current to flow.

[0056] Next, Figure 8 It is shown in Figure 5 A 3D view of the frame 96 has been added to the humidity control device 2. Figure 9 yes Figure 8 An exploded perspective view of the humidity control device 2. (See diagram below.) Figure 8 and Figure 9As shown, the humidity control device 2 may further have a frame 96 that holds the honeycomb structure 90 (adsorption section 20) on both sides in the airflow direction of the air 10. The frame 96 is a rectangular ring and is made of an insulating material such as polyphenylene sulfide, polybutylene terephthalate, or nylon 66. The frame 96 is arranged on both sides of the honeycomb structure 90 in a manner that overlaps with the first metal terminal 94 and the second metal terminal 95. The flow obstruction section 22 may be at least partially formed by the frame 96.

[0057] The following is a detailed description of each component of the humidity control device 2.

[0058] (2-1. About honeycomb structures)

[0059] The shape of the honeycomb structure 90 is not particularly limited. For example, the cross-section of the honeycomb structure 90 orthogonal to the flow path direction (the direction in which the compartment 901a extends) can be a polygon such as a quadrilateral (rectangle, square), pentagon, hexagon, heptagon, or octagon, a circle, or a shape with rounded arcs (oval, elliptical, oblong, rounded rectangle, etc.). It should be noted that the end faces (first end face 90a and second end face 90b) have the same shape as the cross-section. In addition, when the cross-section and end faces are polygonal, the corners can be chamfered.

[0060] The shape of compartment 901a is not particularly limited. In the cross-section of the honeycomb structure 90 perpendicular to the flow direction, it can be a polygon, circle, or shape with arcs, such as a quadrilateral, pentagon, hexagon, heptagon, or octagon. These shapes can be single or combinations of two or more. Among these shapes, quadrilaterals or hexagons are preferred. By providing compartment 901a with such a shape, the pressure loss during airflow 10 can be reduced. It should be noted that... Figures 5-7 The diagram shows a honeycomb structure 90 as an example. In the cross section of the honeycomb structure 90 orthogonal to the flow path direction, the shape of the cross section and the shape of the compartment 901a are quadrilaterals.

[0061] The honeycomb structure 90 can be a honeycomb joint having multiple honeycomb cells and a bonding layer that interlocks the outer peripheral surfaces of the multiple honeycomb cells. By using the honeycomb joint, it is possible to suppress the generation of cracks and increase the total cross-sectional area of ​​the compartment 901a, which is very important for ensuring the flow rate of air 10.

[0062] It should be noted that a bonding material can be used to form the bonding layer. There are no particular limitations on the bonding material; a paste-like material made by adding a solvent such as water to a ceramic material can be used. The bonding material may contain materials with PTC properties, or it may contain the same materials as the outer wall 900 and the partition wall 901. In addition to its function of bonding the cell units together, the bonding material can also be used as a coating material for the outer periphery of the bonded cell units.

[0063] Ideally, the thickness of the partition wall 901, the cell density, and the cell spacing (or the opening ratio of the cell 901a) should be well combined from the perspectives of ensuring the strength of the honeycomb structure 90, reducing the pressure loss when the air 10 passes through the cell 901a, ensuring the load-bearing capacity of the functional materials, and ensuring the contact area with the air 10 flowing in the cell 901a.

[0064] In this specification, the compartment density is the number of compartments divided by the area of ​​one end face (first end face 90a or second end face 90b) of the honeycomb structure 90 (the total area of ​​the partition walls 901 and compartments 901a excluding the outer wall 900).

[0065] In this specification, the compartment spacing refers to the value obtained through the following calculations. First, the area of ​​one end face (first end face 90a or second end face 90b) of the honeycomb structure 90 (the total area of ​​the partitions 901 and compartments 901a excluding the outer wall 900) is divided by the number of compartments to calculate the area of ​​each compartment. Next, the square root of the area of ​​each compartment is calculated and set as the compartment spacing.

[0066] In this specification, the aperture ratio of compartment 901a is: the total area of ​​compartments 901a divided by partition walls 901 in a cross-section of the honeycomb structure 90 orthogonal to the flow path direction, divided by the area of ​​one end face (first end face 90a or second end face 90b) (the total area of ​​partition walls 901 and compartments 901a excluding the outer wall 900). It should be noted that the first electrode 92, the second electrode 93, and the adsorption layer 91 described later are not considered when calculating the aperture ratio of compartment 901a.

[0067] In an advantageous embodiment from the viewpoint of carrying a sufficient amount of functional material, the thickness of the partition 901 is 0.300 mm or less, and the compartment density is 140 compartments / cm³. 2 The following conditions apply, and the spacing between compartments is 0.85 mm or more. In a preferred embodiment, the thickness of the partition wall 901 is 0.200 mm or less, and the compartment density is 120 compartments / cm². 2 The following conditions apply, and the compartment spacing is 0.91 mm or more. In a more preferred embodiment, the thickness of the partition wall 901 is 0.160 mm or less, and the compartment density is 110 compartments / cm². 2The following applies, and the spacing between compartments is 0.95mm or more.

[0068] In the above embodiments, from the viewpoint of ensuring the strength of the honeycomb structure 90 and keeping the resistance at a low level, the lower limit of the thickness of the partition 901 is preferably 0.010 mm or more, more preferably 0.020 mm or more, and even more preferably 0.030 mm or more.

[0069] In the above embodiments, from the viewpoints of ensuring the strength of the honeycomb structure 90, maintaining a low resistance level, and increasing the surface area to promote reaction, adsorption, and detachment, the lower limit of the cell density is preferably 30 cells / cm². 2 The above is more preferably 35 compartments / cm. 2 The above is further preferred to be 40 compartments / cm. 2 above.

[0070] In the above embodiments, from the viewpoints of ensuring the strength of the honeycomb structure 90, keeping the resistance at a low level, and increasing the surface area to promote reaction, adsorption, and detachment, the upper limit of the cell spacing is preferably 2.0 mm or less, more preferably 1.8 mm or less, and even more preferably 1.6 mm or less.

[0071] In an advantageous embodiment from the viewpoint of simultaneously reducing pressure loss and maintaining strength, the thickness of the partition wall 901 is 0.08–0.36 mm, and the compartment density is 2.54–140 compartments / cm³. 2 The opening ratio of compartment 901a is 0.70 or higher. In a preferred embodiment, the thickness of the partition wall 901 is 0.09 to 0.35 mm, and the compartment density is 15 to 100 compartments / cm³. 2 The opening ratio of compartment 901a is 0.80 or higher. In a more preferred embodiment, the thickness of the partition wall 901 is 0.14 to 0.30 mm, and the compartment density is 20 to 90 compartments / cm³. 2 The opening ratio of compartment 901a is above 0.85.

[0072] In the above embodiments, from the viewpoint of ensuring the strength of the honeycomb structure 90, the upper limit of the opening ratio of the compartment 901a is preferably 0.94 or less, more preferably 0.92 or less, and even more preferably 0.90 or less.

[0073] The thickness of the outer wall 900 is not particularly limited, but is preferably determined based on the following viewpoints. First, from the viewpoint of reinforcing the honeycomb structure 90, the thickness of the outer wall 900 is preferably 0.05 mm or more, more preferably 0.06 mm or more, and even more preferably 0.08 mm or more. On the other hand, from the viewpoint of increasing resistance to suppress initial current and reducing pressure loss when air 10 flows, the thickness of the outer wall 900 is preferably 1.0 mm or less, more preferably 0.5 mm or less, even more preferably 0.4 mm or less, and even more preferably 0.3 mm or less.

[0074] In this specification, the thickness of the outer wall 900 refers to the length in the normal direction of the side surface of the honeycomb structure 90, from the boundary between the outer wall 900 and the outermost peripheral compartment 901a or partition 901 to the side surface of the honeycomb structure 90 in a cross section orthogonal to the flow path direction.

[0075] The length of the honeycomb structure 90 in the flow path direction and the cross-sectional area orthogonal to the flow path direction can be adjusted according to the required size of the humidity control device 2, without any particular limitation. For example, in the case of a compact humidity control device 2 that ensures the specified functions, the length in the flow path direction of the honeycomb structure 90 can be set to 2 to 20 mm, and the cross-sectional area orthogonal to the flow path direction can be set to 10 cm². 2 The above should be noted. It should be stated that there is no specific upper limit to the cross-sectional area of ​​the honeycomb structure 90 that is orthogonal to the flow direction; for example, it could be 300 cm². 2 .

[0076] The partitions 901 constituting the honeycomb structure 90 are made of a material that can be heated by electricity, and more preferably, a material with PTC properties. If necessary, the outer wall 900 can also be made of a material with PTC properties, similar to the partitions 901. With this configuration, the adsorption layer 91 can be heated by heat transfer from the heated partitions 901 (and, if necessary, the outer wall 900). Furthermore, materials with PTC properties have the characteristic that when the temperature rises above the Curie point, the resistance increases sharply, making it difficult for current to flow. Therefore, regarding the partitions 901 (and, if necessary, the outer wall 900), the current flowing through them is limited when the humidity control device 2 reaches a high temperature, thus suppressing overheating of the humidity control device 2. Therefore, thermal degradation of the adsorption layer 91 caused by overheating can also be suppressed.

[0077] From the viewpoint of achieving moderate heat generation, the lower limit of the volume resistivity of the material with PTC characteristics at 25°C is preferably 0.5 Ω·cm or more, more preferably 1 Ω·cm or more, and even more preferably 5 Ω·cm or more. From the viewpoint of generating heat with a low driving voltage, the upper limit of the volume resistivity of the material with PTC characteristics at 25°C is preferably 170 Ω·cm or less, more preferably 160 Ω·cm or less, and even more preferably 150 Ω·cm or less. In this specification, the volume resistivity of the material with PTC characteristics at 25°C is measured according to JIS K6271:2008.

[0078] From the viewpoint of being able to generate heat through electricity and possessing PTC characteristics, the outer wall 900 and the partition wall 901 are preferably made of a material with barium titanate (BaTiO3) as the main component. Furthermore, this material is more preferably a ceramic made of a material whose main component is barium titanate (BaTiO3) crystalline particles, in which a portion of Ba has been replaced by rare earth elements. It should be noted that in this specification, "main component" refers to a component that accounts for more than 50% by mass of the total composition. The content of BaTiO3 crystalline particles can be determined using fluorescence X-ray analysis. Other crystalline particles can also be determined using the same method.

[0079] The composition of BaTiO3-based crystal particles, in which a portion of Ba is replaced by rare earth elements, can be expressed as (Ba 1-x A x TiO3 represents the rare earth element. In the composition formula, A represents one or more rare earth elements, and 0.0001≤x≤0.010.

[0080] A can be any rare earth element, without particular limitation, but preferably selected from one or more elements in the group consisting of La, Ce, Pr, Nd, Eu, Gd, Dy, Ho, Er, Y, and Yb, and more preferably La. From the viewpoint of suppressing excessively high resistance at room temperature, x is preferably 0.001 or more, and more preferably 0.0015 or more. On the other hand, from the viewpoint of suppressing excessively high resistance at room temperature due to insufficient sintering, x is preferably 0.009 or less.

[0081] The content of BaTiO3-based crystalline particles, in which a portion of Ba is replaced by rare earth elements, in the ceramic is sufficient to constitute a major component; there is no particular limitation, but it is preferably 90% by mass or more, more preferably 92% by mass or more, and even more preferably 94% by mass or more. It should be noted that the upper limit of the content of BaTiO3-based crystalline particles is not particularly limited, but is typically 99% by mass, preferably 98% by mass.

[0082] The content of BaTiO3 crystalline particles can be determined using fluorescence X-ray diffraction analysis. Other crystalline particles can also be determined using the same method.

[0083] From the viewpoint of reducing environmental impact, the materials used for the outer wall 900 and the partition wall 901 are preferably substantially lead-free (Pb). Specifically, the Pb content in the outer wall 900 and the partition wall 901 is preferably 0.01% by mass or less, more preferably 0.001% by mass or less, and even more preferably 0% by mass. With a low Pb content, it is possible to safely blow air 10, which is heated in contact with the heated partition wall 901, towards living organisms such as humans. It should be noted that the Pb content in the outer wall 900 and the partition wall 901, converted to PbO, is preferably less than 0.03% by mass, more preferably less than 0.01% by mass, and even more preferably 0% by mass. The lead content can be determined using ICP-MS (Inductively Coupled Plasma Mass Analysis).

[0084] From the viewpoint of efficiently heating the air 10, the lower limit of the Curie point of the materials constituting the outer wall 900 and the partition wall 901 is preferably 80°C or higher, more preferably 90°C or higher, and even more preferably 100°C or higher. Furthermore, from the viewpoint of ensuring the safety of components placed in or near the vehicle compartment, the upper limit of the Curie point is preferably 250°C or lower, more preferably 225°C or lower, even more preferably 200°C or lower, and even more preferably 150°C or lower.

[0085] The Curie point of the materials constituting the outer wall 900 and the partition wall 901 can be adjusted by the type and amount of displacement agent. For example, barium titanate (BaTiO3) has a Curie point of about 120°C. By replacing a portion of Ba and Ti with one or more of Sr, Sn and Zr, the Curie point can be shifted to the low-temperature side.

[0086] In this specification, the Curie point is determined using the following method. The sample is mounted in a sample holder for measurement and fitted into a measuring chamber (e.g., MINI-SUBZERO MC-810P, Espec Co., Ltd.). Using a DC resistance meter (e.g., multimeter 3478A, YOKOGAWA HEWLETT PACKARD, LTD.), the change in resistance of the sample relative to temperature is measured as the temperature increases from 10°C. Based on the obtained resistance-temperature diagram, the temperature at which the resistance value becomes twice the resistance value at room temperature (20°C) is defined as the Curie point.

[0087] (2-2. Regarding the first and second electrodes)

[0088] The first electrode 92 and the second electrode 93 are disposed on the first end face 90a and the second end face 90b, respectively. By applying a voltage between the first electrode 92 and the second electrode 93, the honeycomb structure 90 can be heated by Joule heating.

[0089] The first electrode 92 and the second electrode 93 are not particularly limited, and for example, a metal or alloy containing at least one selected from Cu, Ag, Al, Ni, and Si can be used. Alternatively, an ohmic electrode capable of ohmic contact with the outer wall 900 and / or the partition wall 901 having PTC characteristics can also be used. The ohmic electrode can be, for example, an ohmic electrode containing at least one selected from Al, Au, Ag, and In as the base metal, and at least one selected from Ni, Si, Zn, Ge, Sn, Se, and Te for n-type semiconductors as the dopant. Furthermore, the first electrode 92 and the second electrode 93 can be a single-layer structure or a stacked structure of two or more layers. When the first electrode 92 and the second electrode 93 have a stacked structure of two or more layers, the materials of each layer can be the same type or different types.

[0090] The thicknesses of the first electrode 92 and the second electrode 93 can be appropriately set according to the method of forming the first electrode 92 and the second electrode 93. Examples of methods for forming the first electrode 92 and the second electrode 93 include metal deposition methods such as sputtering, vapor deposition, electrolytic deposition, and chemical deposition. Alternatively, the first electrode 92 and the second electrode 93 can be formed by sintering after coating with electrode paste, or by fusion deposition. Furthermore, the first electrode 92 and the second electrode 93 can also be manufactured by bonding metal plates or alloy plates.

[0091] Regarding the thickness of the first electrode 92 and the second electrode 93, for example, in the sintering of electrode paste, the thickness is preferably about 5 to 30 μm; in dry plating such as sputtering and evaporation, the thickness is preferably about 100 to 1000 nm; in fusion plating, the thickness is preferably about 10 to 100 μm; and in wet plating such as electrolytic deposition and chemical deposition, the thickness is preferably about 5 to 30 μm. Furthermore, in the bonding of metal plates or alloy plates, their thickness is preferably set to about 5 to 100 μm.

[0092] (2-3. Regarding the first metal terminal and the second metal terminal)

[0093] By providing a first metal terminal 94 and a second metal terminal 95, connection to an external power source is facilitated. The first metal terminal 94 and the second metal terminal 95 are connected to a wire connected to the external power source.

[0094] The metals constituting the first metal terminal 94 and the second metal terminal 95 can also be elemental metals or alloys. From the viewpoint of corrosion resistance, resistivity, and linear expansion rate, alloys containing at least one selected from the group consisting of Cr, Fe, Co, Ni, Cu, Al, and Ti are preferred, and stainless steel, Fe-Ni alloys, and phosphor bronze are more preferred. The thickness of the first metal terminal 94 and the second metal terminal 95 is not particularly limited, but is typically 0.01 to 10 mm, and usually 0.05 to 5 mm.

[0095] Regarding the connection method between the first metal terminal 94 and the second metal terminal 95 and the first electrode 92 and the second electrode 93, electrical connection is sufficient and there are no particular limitations. For example, the connection can be made by diffusion bonding, mechanical pressure mechanism, welding, etc.

[0096] (2-4. Regarding intermediate materials)

[0097] An intermediate material can be provided between the first electrode 92 and the second electrode 93 and the first metal terminal 94 and the second metal terminal 95. By providing an intermediate material, the structural freedom of the connection between the first electrode 92 and the second electrode 93 and the first metal terminal 94 and the second metal terminal 95 is increased. The material of the intermediate material is not particularly limited and can be the same as the material of the first metal terminal 94 and the second metal terminal 95. Alternatively, the intermediate material can be different from the material of the first metal terminal 94 and the second metal terminal 95. In this case, the intermediate material can be formed from brazing filler metal, solder, conductive adhesive, etc. Regarding the connection method between the intermediate material and the first metal terminal 94 and the second metal terminal 95, and the first electrode 92 and the second electrode 93, an electrical connection is sufficient and is not particularly limited. For example, it can be connected by diffusion bonding, mechanical pressure mechanism, welding, etc.

[0098] (2-5. About the adsorption layer)

[0099] like Figure 7 As shown, the humidity control device 2 may include an adsorption layer 91 disposed on the surface of the partition wall 901. The adsorption layer 91 may be disposed on the surface of the partition wall 901 (in the case of the outermost compartment 901a, the partition wall 901 that divides the outermost compartment 901a and the outer wall 900). By disposing the adsorption layer 91 in this way, the functional material contained in the adsorption layer 91 can be easily heated, and therefore, it is easy to make it perform the desired function of the functional material.

[0100] The adsorbent material contained in the adsorption layer 91 can be any material capable of performing the desired function, without particular limitation. The adsorbent material has the function of adsorbing moisture, carbon dioxide, and / or volatile components from the air. Furthermore, the adsorption layer 91 may further contain a catalyst. Thus, the target substance can be purified. By combining the adsorbent material and the catalyst, the capture function of the adsorbent material for the target substance can be improved.

[0101] The preferred adsorbent material possesses the ability to adsorb target substances, such as moisture, carbon dioxide, and volatile components, at temperatures ranging from -20°C to 40°C and to release them at temperatures above 60°C. Examples of adsorbent materials with this function include zeolite, silica gel, activated carbon, alumina, silicon dioxide, low-crystallinity clay, and amorphous aluminosilicate composites. The type of adsorbent material is selected appropriately based on the type of target substance. One type of adsorbent material can be used alone, or two or more can be used in combination.

[0102] As a catalyst, it is preferable to have the function of promoting redox reactions. Examples of catalysts with such functions include metal catalysts such as Pt, Pd, and Ag, and oxide catalysts such as CeO2 and ZrO2. A single catalyst can be used, or two or more catalysts can be used in combination.

[0103] The air in the carriage contains volatile components such as volatile organic compounds (VOCs) or odor components other than VOCs. Specific examples of volatile components include: ammonia, acetic acid, isovaleric acid, nonenal, formaldehyde, toluene, xylene, p-dichlorobenzene, ethylbenzene, styrene, chlorpyrifos, di-n-butyl phthalate, tetradecane, di-2-ethylhexyl phthalate, diazinon, acetaldehyde, and N-methylcarbamate-2-(1-methylpropyl)phenyl ester.

[0104] The thickness of the adsorption layer 91 can be determined according to the size of the compartment 901a and is not particularly limited. For example, from the viewpoint of ensuring sufficient contact with the air 10, the thickness of the adsorption layer 91 is preferably 20 μm or more, more preferably 25 μm or more, and even more preferably 30 μm or more. On the other hand, from the viewpoint of suppressing the adsorption layer 91 from peeling off from the partition wall 901 or the outer wall 900, the thickness of the adsorption layer 91 is preferably 400 μm or less, more preferably 380 μm or less, and even more preferably 350 μm or less.

[0105] The thickness of the adsorption layer 91 is measured according to the following steps: An arbitrary cross-section of the honeycomb structure 90 parallel to the flow path direction is cut out, and a cross-sectional image at approximately 50x magnification is obtained using a scanning electron microscope or the like. Furthermore, this cross-section is positioned so that it passes through the centroid of a cross-section of the honeycomb structure 90 orthogonal to the flow path direction. For each adsorption layer 91 visible in the cross-sectional image, the thickness is calculated by dividing the cross-sectional area by the length of the compartment 901a in the flow path direction. This calculation is performed for all adsorption layers 91 visible in the cross-sectional image, and the overall average value is taken as the thickness of the adsorption layer 91.

[0106] From the viewpoint that the functional material performs its desired function within the humidity control device 2, the amount of the adsorption layer 91 is preferably 50 to 500 g / L relative to the volume of the honeycomb structure 90, more preferably 100 to 400 g / L, and even more preferably 150 to 350 g / L. It should be noted that the volume of the honeycomb structure 90 is a value determined based on the external dimensions of the honeycomb structure 90.

[0107] (3. Regarding the manufacturing method of humidity control equipment)

[0108] The method for manufacturing the humidity control device 2 according to the embodiments of the present invention can be any method having the above-described features, and is not particularly limited, and can be carried out according to known methods. Hereinafter, the method for manufacturing the humidity control device 2 according to the embodiments of the present invention will be described illustratively.

[0109] The manufacturing method of the honeycomb structure 90 constituting the humidity control device 2 includes a molding process and a firing process.

[0110] In the molding process, a blank containing ceramic raw materials including BaCO3 powder, TiO2 powder, and rare earth nitrates or hydroxides is molded to produce a honeycomb molded body with a relative density of more than 60%.

[0111] The powders can be dry-mixed according to the desired composition to obtain ceramic raw materials.

[0112] A green body can be obtained by adding a dispersion medium, binder, plasticizer, and dispersant to ceramic raw materials and then mixing them. The green body may contain additives such as displacement agents, metal oxides, property improvers, and conductive powders, as needed.

[0113] The amount of ingredients other than ceramic raw materials can be adjusted to achieve a relative density of 60% or more in the honeycomb molded body, without any particular limitation.

[0114] Here, the "relative density of the honeycomb molded body" in this specification refers to the ratio of the density of the honeycomb molded body to the true density of the entire ceramic raw material. Specifically, it can be calculated using the following formula.

[0115] Relative density (%) of honeycomb molded material = Density of honeycomb molded material (g / cm³) 3 True density of the ceramic raw material as a whole (g / cm³) 3 )×100

[0116] The density of the honeycomb molded body can be determined using Archimedes' method with pure water as the medium. Alternatively, the true density of the entire ceramic raw material can be calculated by dividing the total mass (g) of all raw materials by the total actual volume (cm³) of all raw materials. 3 To find the solution, we need to use the following method.

[0117] Examples of dispersion media include water, or a mixture of water and organic solvents such as alcohols, with water being particularly preferred.

[0118] Examples of adhesives include organic adhesives such as methylcellulose, hydroxypropoxycellulose, hydroxyethylcellulose, carboxymethylcellulose, and polyvinyl alcohol. The combination of methylcellulose and hydroxypropoxycellulose is particularly preferred. One type of adhesive may be used alone, or two or more may be used in combination; however, it is preferable that they do not contain alkali metal elements.

[0119] Examples of plasticizers include: polyoxyethylene alkyl ethers, polycarboxylic acid polymers, and alkyl phosphates.

[0120] Dispersants that can be used include surfactants such as polyoxyethylene alkyl ethers, ethylene glycol, dextrin, fatty acid soaps, and polyols. A single dispersant can be used, or two or more can be used in combination.

[0121] Honeycomb structures can be made by extruding preforms. During extrusion molding, a die with the desired overall shape, cell shape, cell wall thickness, cell density, etc., can be used.

[0122] The relative density of the honeycomb molded body obtained by extrusion molding is 60% or more, preferably 65% ​​or more. By controlling the relative density of the honeycomb molded body within such a range, the honeycomb molded body can be densified, thereby reducing the electrical resistance at room temperature. It should be noted that there is no particular upper limit to the relative density of the honeycomb molded body, which is typically 80%, preferably 75%.

[0123] The honeycomb molded body can be dried before the firing process. There are no particular limitations on the drying method; for example, conventionally known drying methods such as hot air drying, microwave drying, dielectric drying, reduced pressure drying, vacuum drying, and freeze drying can be used. However, a drying method combining hot air drying and microwave drying or dielectric drying is preferred in terms of achieving rapid and uniform drying of the entire molded body.

[0124] The firing process includes: holding at 1150-1250℃, then heating to a maximum temperature of 1360-1430℃ at a rate of 20-600℃ / hour, and holding for 0.5-10 hours.

[0125] By holding the honeycomb molded body at a maximum temperature of 1360–1430°C for 0.5–10 hours, a honeycomb structure 90 with BaTiO3 crystalline particles, in which a portion of Ba is replaced by rare earth elements, as the main component can be obtained.

[0126] In addition, by holding the temperature at 1150–1250°C, the Ba2TiO4 crystal particles generated during the firing process can be easily removed, thus enabling the honeycomb structure to be densified by 90%.

[0127] Furthermore, by setting the heating rate of the maximum temperature from 1150 to 1250°C to 1360 to 1430°C to 20 to 600°C / hour, it is possible to generate 1.0 to 10.0% by mass of Ba6Ti in the honeycomb structure 90. 17 O 40 Crystalline particles.

[0128] The holding time at 1150–1250°C is not particularly limited, but is preferably 0.5–10 hours. By setting the holding time to this value, the Ba2TiO4 crystal particles generated during the firing process can be easily and stably removed.

[0129] The firing process preferably includes maintaining the temperature at 900–950°C for 0.5–5 hours during heating. By maintaining the temperature at 900–950°C for 0.5–5 hours, BaCO3 decomposes efficiently, easily yielding a honeycomb structure 90 with a specified composition.

[0130] It should be noted that a degreasing process to remove the binder can be performed prior to the firing process. The atmosphere for the degreasing process is preferably atmospheric to ensure complete decomposition of the organic components.

[0131] Furthermore, from the perspective of controlling electrical characteristics and manufacturing costs, the atmosphere of the firing process is preferably an atmospheric atmosphere.

[0132] There are no particular restrictions on the type of furnace used in the firing or degreasing process; electric furnaces, gas furnaces, etc., can be used.

[0133] By forming the first electrode 92 and the second electrode 93 into the honeycomb structure 90 obtained in this way, a humidity control device 2 can be manufactured. Furthermore, the first electrode 92 and the second electrode 93 can be formed by metal deposition methods such as sputtering, vapor deposition, electrolytic deposition, and chemical deposition. Alternatively, the first electrode 92 and the second electrode 93 can be formed by sintering after coating with electrode paste. Furthermore, the first electrode 92 and the second electrode 93 can also be formed by fusion deposition. The first electrode 92 and the second electrode 93 can be composed of a single layer or multiple electrode layers with different compositions. The following describes representative methods for forming the first electrode 92 and the second electrode 93.

[0134] First, an electrode slurry comprising electrode material, organic binder, and dispersion medium is prepared and coated onto the first end face 90a or the second end face 90b of the honeycomb structure 90. The dispersion medium can be water, an organic solvent (e.g., toluene, xylene, ethanol, n-butanol, ethyl acetate, butyl acetate, terpineol, dihydroterpineol, Texanol, ethylene glycol monobutyl ether acetate, diethylene glycol monoethyl ether acetate, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether acetate, diethylene glycol monobutyl ether) or a mixture thereof. Excess slurry on the outer periphery of the honeycomb structure 90 is removed by blowing and wiping. Then, by drying the slurry, a first electrode 92 and a second electrode 93 can be formed on the first end face 90a or the second end face 90b of the honeycomb structure 90. Drying can be performed while the humidification device 2 is heated to a temperature of, for example, approximately 120–600°C. The series of processes of coating, slurry removal and drying can be performed only once or repeatedly to set the desired thickness of the first electrode 92 and the second electrode 93.

[0135] Next, a first metal terminal 94 and a second metal terminal 95 are disposed at predetermined positions on the first electrode 92 and the second electrode 93, and the first electrode 92 and the second electrode 93 are connected to the first metal terminal 94 and the second metal terminal 95. The above method can be used as a method for connecting the first electrode 92 and the second electrode 93 to the terminals. Alternatively, if an intermediate material is provided between the first electrode 92 and the second electrode 93 and the first metal terminal 94 and the second metal terminal 95, after the intermediate material is disposed at predetermined positions on the first electrode 92 and the second electrode 93 and connected, the first metal terminal 94 and the second metal terminal 95 are disposed at predetermined positions on the intermediate material and connected. The above method can be used as a method for connecting them.

[0136] It should be noted that the first metal terminal 94, the second metal terminal 95, and the intermediate material can be disposed of after the adsorption layer 91 described below is formed.

[0137] Next, by forming an adsorption layer 91 on the surface of the partition wall 901, etc., of the humidity control device 2 obtained in this way, a humidity control device with a functional material layer is obtained.

[0138] The method for forming the adsorption layer 91 is not particularly limited, and for example, it can be formed using the following steps: The humidity conditioning device 2 is immersed in a slurry containing functional materials, an organic binder, and a dispersion medium for a specified time, and excess slurry on the end faces and outer periphery of the honeycomb structure 90 is removed by blowing and wiping. The dispersion medium can be water, an organic solvent (e.g., toluene, xylene, ethanol, n-butanol, ethyl acetate, butyl acetate, terpineol, dihydroterpineol, Texanol, ethylene glycol monobutyl ether acetate, diethylene glycol monoethyl ether acetate, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether acetate, diethylene glycol monobutyl ether) or a mixture thereof. Afterwards, by drying the slurry, the adsorption layer 91 can be formed on the surface of the partition wall 901. Drying can be performed while the humidity conditioning device 2 is heated to a temperature of approximately 120–600°C. The series of processes of impregnation, slurry removal and drying can be performed only once or repeatedly to form an adsorption layer 91 of desired thickness on the surface of the adjacent 901, etc.

[0139] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited to these examples. It is understood that those skilled in the art to which this invention pertains can conceive of various modifications or alterations within the scope of the technical concept described in the claims, and these modifications or alterations naturally also fall within the technical scope of this invention.

[0140] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited to these examples. It is understood that those skilled in the art to which this invention pertains can conceive of various modifications or alterations within the scope of the technical concept described in the claims, and these modifications or alterations naturally also fall within the technical scope of this invention.

[0141] Example

[0142] The present invention will now be described in more detail through examples. However, the present invention is not limited to these examples.

[0143] BaCO3 powder, TiO2 powder, and La(NH3)3·6H2O powder were prepared as ceramic raw materials. These powders were weighed according to the specified composition after firing and dry-mixed to obtain a mixed powder. Dry mixing was carried out for 30 minutes. Next, relative to 100 parts by weight of the obtained mixed powder, water, binder, plasticizer, and dispersant were added in appropriate amounts ranging from 3 to 30 parts by weight, respectively, to obtain a ceramic molded body with a relative density of 64.8% after extrusion molding. The mixture was then kneaded to obtain a green body. Methylcellulose was used as the binder. Polyoxyethylene alkyl ethers were used as the plasticizer and dispersant.

[0144] Next, the obtained preform is placed into an extrusion molding machine and extruded using a specified die to form a honeycomb structure of the shape given below after firing.

[0145] The shape of the cross-section and end face of the honeycomb structure orthogonal to the flow direction: quadrilateral

[0146] Dimensions of the honeycomb structure: 114mm wide (horizontal), 114mm long (vertical), 10mm long

[0147] The cross-sectional shape of the compartment orthogonal to the flow path direction: quadrilateral

[0148] The thickness of the partition wall: 0.127mm

[0149] Outer wall thickness: 0.8mm

[0150] Compartment density: 85.3 compartments / cm³ 2

[0151] Compartment spacing: 1.08mm

[0152] Compartment opening ratio: 0.55~0.80

[0153] The cross-sectional area of ​​the honeycomb structure orthogonal to the direction of flow path extension: 13000 mm² 2

[0154] Length of the flow path in the honeycomb structure: 10mm

[0155] The volume resistivity of the material constituting the partition (and outer wall) at 25°C is 12 Ω·cm.

[0156] Curie point of the materials constituting the partition (and outer wall): 120°C

[0157] It should be noted that the volume resistivity of the partition wall can be controlled by adjusting the proportion of raw materials or the firing conditions.

[0158] Next, the obtained honeycomb molded body was subjected to dielectric drying and hot air drying, and then degreased in a firing furnace under atmospheric atmosphere (450℃ × 4 hours). Following this, it was fired under atmospheric atmosphere to obtain the honeycomb structure. The firing process was as follows: after holding at 950℃ for 1 hour, the temperature was increased to 1200℃ and held at 1200℃ for 1 hour. Then, the temperature was increased to 1400℃ (maximum temperature) at a rate of 200℃ / hour and held at 1400℃ for 2 hours.

[0159] Next, a first electrode and a second electrode with a thickness of 0.05 mm are formed on the two end faces (first end face and second end face) of the obtained honeycomb structure. The first electrode and the second electrode are formed as follows. First, an electrode paste containing aluminum (electrode material), ethyl cellulose and diethylene glycol monobutyl ether (organic binder) is prepared and coated on one end face. Next, excess electrode paste on the outer periphery of the honeycomb structure is removed by blowing and wiping, and the electrode paste is dried, thereby forming an electrode on one end face. Similarly, an electrode is also formed on the other end face.

[0160] Next, the honeycomb structure with the first electrode and the second electrode is immersed in a slurry containing zeolite (adsorbent material) as a functional material, organic binder and water. The slurry adhering to excess positions (such as the outer periphery) is removed by blowing and wiping, and then dried at a temperature of about 550°C, thereby forming a functional material layer at the specified position.

[0161] Next, a first metal terminal is joined to the first electrode, and a second metal terminal is joined to the second electrode. The first and second metal terminals are joined as follows: The first and second metal terminals are components made of a strip of SUS430 metal with a width of 3.5 mm and a thickness of 0.7 mm. The overall shape of the first and second metal terminals is a quadrilateral frame. With the outer edges of the first and second metal terminals aligned with the outer edges of the two end faces of the honeycomb structure, the first and second metal terminals are soldered onto the first and second electrodes. A flow obstruction portion is thus formed by the aforementioned first and second metal terminals.

[0162] The sample of the humidity control device obtained as described above is placed in the channel. At this time, the maximum width of the flow obstruction when viewing the end face of the humidity control device in the channel from the downstream side in the air flow direction is changed as shown in Table 1 below.

[0163] Table 1

[0164]

[0165] Figure 10This shows a design where the maximum width of the flow obstruction is set to 10mm. Figure 11 This shows a design where the maximum width of the flow obstruction is set to 25mm. Figure 11 In the illustrated designs, the maximum width is increased by widening the channel on the downstream side of the humidifier in the direction of airflow. In all designs, a blower is positioned upstream of the humidifier, and a humidity sensor is positioned downstream of the humidifier. It should be noted that the distance between the end face of the humidifier and the humidity sensor is set to 70 mm.

[0166] The sample in the humidity control equipment was placed in the channel as described above, and both regeneration and desiccation modes were performed. The regeneration mode was performed as follows: the blower was started to circulate air at 25°C and 40% relative humidity in the channel at a flow rate of 0.07 m / s, while a 12V voltage was applied to the humidity control equipment from the DC power supply for 3 minutes. The desiccation mode was performed as follows: no voltage was applied to the humidity control equipment, and air under the same conditions was circulated in the current channel at a flow rate of 0.9 m / s for 1 minute. Additionally, in desiccation mode, the absolute humidity [g / m³] was measured using a humidity sensor located downstream of the humidity control equipment. 3 The measurements were performed. The results are shown in Table 1 above.

[0167] When the maximum width of the flow obstruction section is set to 25mm, the absolute humidity downstream of the humidification equipment is 4.1g / m³. 3 In contrast, when the maximum width of the flow obstruction section is set to 10 mm, the absolute humidity downstream of the humidification equipment is 2.6 g / m³. 3 It was found that when the maximum width of the flow obstruction section was set to 25 mm, air stagnation occurred on the downstream side of the humidification device in the airflow direction, thus increasing the absolute humidity downstream of the humidification device. On the other hand, it was found that when the maximum width of the flow obstruction section was set to 10 mm, less air stagnation occurred on the downstream side of the humidification device in the airflow direction, thus decreasing the absolute humidity downstream of the humidification device. These results confirm that by setting the maximum width of the flow obstruction section when observing the end face of the humidification device in the channel from the downstream side in the airflow direction to 10 mm or less, the possibility of moisture detached from the self-adsorbing material remaining in the channel can be reduced, thereby reducing the possibility of this moisture being introduced into the passenger compartment. When the maximum width of the flow obstruction section was set to 9 mm, the absolute humidity downstream of the humidification device was further reduced, and when the maximum width of the flow obstruction section was set to 5 mm, the absolute humidity downstream of the humidification device was reduced even further. These results confirm that setting the maximum width of the flow obstruction section to 9 mm is more preferable, and setting it to 5 mm is even more preferable.

Claims

1. An air conditioning system for a vehicle, comprising: A humidity control device having an adsorption section and a heating mechanism capable of heating the adsorption section, the adsorption section containing an adsorption material that adsorbs moisture below a specified temperature and is capable of removing the adsorbed moisture when the specified temperature is exceeded. as well as The passage, wherein the humidification device is disposed inside the passage, allows air to circulate from the vehicle compartment or outside the vehicle, and the passage has a first flow path for the air to flow into the vehicle compartment and a second flow path for the air to be discharged outside the vehicle on the downstream side of the humidification device; The humidification device has a flow obstruction portion that is arranged in a strip shape on the outer periphery of the end face to obstruct the airflow, and a flow allowance portion that is arranged on the inner side of the flow obstruction portion to allow the airflow. When the end face of the humidification device in the channel is viewed from the downstream side in the direction of air flow, the maximum width of the flow obstruction is less than 10 mm.

2. The vehicle air conditioning system according to claim 1, wherein, The maximum width of the flow obstruction section is 9 mm or less.

3. The vehicle air conditioning system according to claim 1, wherein, The humidity control device further includes a frame that holds the adsorption section from both sides in the direction of air flow, and the flow obstruction section is at least partially formed by the frame.

4. The vehicle air conditioning system according to any one of claims 1 to 3, wherein, The adsorption unit comprises: a honeycomb structure having an outer wall and partitions, the partitions being disposed on the inner side of the outer wall and dividing it into compartments, the compartments forming a flow path for the air extending from a first end face to a second end face; and an adsorption layer containing the adsorption material and disposed on the surface of the partitions. The heating mechanism includes a pair of electrodes connected to the honeycomb structure, through which current flows to heat the honeycomb structure. At least the partitions of the cellular structure are made of a material with PTC properties.

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