Dehumidification device, heater member for dehumidification device, and vehicle compartment dehumidification system

Abstract

A dehumidification device (100) is provided with: a heater member that includes a honeycomb structure having an outer peripheral wall (101) and partition walls (102) that are disposed on the inner side of the outer peripheral wall (101) and that define a plurality of cells (104), and a pair of electrodes (a first electrode (110a) and a second electrode (110b)) provided on the honeycomb structure; and a plurality of cells (104) that serve as flow paths extending from the first end surface (103a) to the second end surface (103b), at least the partition wall (102) is made of a material having PTC characteristics, and a dehumidifying material-containing layer (120) that is provided on the surface of the partition wall (102) and contains a dehumidifying material having a water release temperature of 30-70 DEG C.

Description

Technical Field

[0001] The present invention relates to a dehumidifying device, a heater member for a dehumidifying device, and a vehicle compartment dehumidification system. Background Art

[0002] As a countermeasure against global warming, the demand for reducing the CO 2 emission of automobiles has increased. In addition, as a countermeasure against air pollution, the demand for reducing the emissions of nitrogen oxides and the like from automobiles has increased. Electric vehicles, which are effective for these countermeasures, have attracted much attention.

[0003] However, since an electric vehicle does not have an internal combustion engine that serves as a heating source in a conventional automobile, there is a problem of insufficient heating source. A large amount of heating energy is lost due to ventilation. Therefore, it is considered to reduce ventilation. However, if ventilation is not performed, the humidity in the vehicle compartment increases due to moisture (water vapor) from human exhalation, and fogging occurs when it comes into contact with a relatively cold window glass, thus affecting driving safety.

[0004] Then, a dehumidifying device has been proposed, in which the humidity in the vehicle compartment is reduced by adsorbing the moisture in the vehicle compartment to the dehumidifying material of the dehumidifier, and the air is heated to a high temperature by a heating device arranged upstream of the dehumidifier and the air is made to flow to the dehumidifier, thereby releasing the moisture to the outside of the vehicle and regenerating the dehumidifying material of the dehumidifier (for example, Patent Document 1). The heating device used in this dehumidifying device employs a heater member that utilizes Joule heat.

[0005] However, a heater member that utilizes Joule heat has the following problems: it is likely to be enlarged, squeezing the space inside the vehicle. Therefore, it is desired to use a more compact heater member. In this regard, regarding a heater member having a honeycomb structure with PTC characteristics, it is known that it is advantageous in that the heat transfer area per unit volume can be increased and overheating can be prevented (for example, Patent Document 2).

[0006] Prior Art Documents

[0007] Patent Documents

[0008] Patent Document 1: Japanese Patent No. 6513170

[0009] Patent Document 2: International Publication No. 2020 / 036067 Summary of the Invention

[0010] Regarding existing dehumidifying devices, a heating device (heater member) is provided upstream of the dehumidifying material. Therefore, a space for arranging both the dehumidifying material and the heating device is required, and it is likely to become large-sized. In addition, in existing dehumidifying devices, the dehumidifying material adsorbed with moisture is indirectly heated by the air heated by the heating device. Therefore, it cannot be said that the regeneration efficiency of the dehumidifying material is sufficient. Further, depending on the type of dehumidifying material used in the dehumidifying device, the temperature at which the adsorbed moisture can be released is sometimes high. Therefore, the amount of power required to increase the heating temperature sometimes increases.

[0011] The present invention has been made to solve the above problems, and an object thereof is to provide a dehumidifying device having a high regeneration efficiency of a dehumidifying material, capable of miniaturization and reducing power consumption, a heater member for a dehumidifying device useful for manufacturing the dehumidifying device, and a vehicle compartment dehumidifying system including the dehumidifying device.

[0012] The inventors of the present invention have intensively studied the structure of the dehumidifying device, and as a result, have found that by providing a dehumidifying material-containing layer containing a dehumidifying material having a water release temperature of 30 to 70°C on the surface of the partition wall of the honeycomb structure constituting the heater member, the above problems can be solved, and thus the present invention has been completed. That is, the present invention is exemplified as follows.

[0013] (1) A dehumidifying device, comprising:

[0014] a heater member including a honeycomb structure and a pair of electrodes provided on the honeycomb structure, the honeycomb structure having an outer peripheral wall and partition walls, the partition walls being disposed inside the outer peripheral wall and partitioning to form a plurality of compartments, the plurality of compartments serving as flow paths extending from a first end face to a second end face, and at least the partition walls being made of a material having PTC characteristics; and

[0015] a dehumidifying material-containing layer provided on the surface of the partition walls and containing a dehumidifying material having a water release temperature of 30 to 70°C.

[0016] (2) The dehumidifying device according to (1), wherein

[0017] the Curie point of the material having PTC characteristics is 30 to 70°C.

[0018] (3) The dehumidifying device according to (2), wherein

[0019] the temperature difference between the water release temperature of the dehumidifying material and the Curie point of the material having PTC characteristics is within ±10°C.

[0020] (4) The dehumidifying device according to any one of (1) to (3), wherein

[0021] The dehumidifying material is one or more selected from aluminosilicate, silica gel, silicon dioxide, graphene oxide, polymer adsorbent material, polystyrenesulfonic acid, and metal-organic framework.

[0022] (5) The dehumidifying device according to any one of (1) to (4), wherein

[0023] The material having PTC characteristics is mainly composed of barium titanate.

[0024] (6) The dehumidifying device according to (5), wherein

[0025] The barium titanate is one or more selected from the following [i] to [iii]:

[0026] [i] (Ba 1-x-y Sr x A y )TiO 3 (wherein A represents one or more rare earth elements, x is 0.15 to 0.25, and y is 0.0001 to 0.01)

[0027] [ii] (Ba 1-x-y Sn x A y )TiO 3 (wherein A represents one or more rare earth elements, x is 0.05 to 0.15, and y is 0.0001 to 0.01)

[0028] [iii] (Ba 1-x-y Zr x A y )TiO 3 (wherein A represents one or more rare earth elements, x is 0.12 to 0.18, and y is 0.0001 to 0.01)

[0029] (7) The dehumidifying device according to any one of (1) to (6), wherein

[0030] The dehumidifying material layer further contains an antibacterial material.

[0031] (8) The dehumidifying device according to (7), wherein

[0032] The antibacterial material is one or more selected from visible light-responsive photocatalyst, silver, copper, and zinc.

[0033] (9) The dehumidifying device according to any one of (1) to (8), wherein

[0034] A pair of the electrodes are disposed on the first end face and the second end face.

[0035] (10) The dehumidifying device according to (9), wherein,

[0036] The dehumidifying device further includes: terminals connected to the pair of electrodes.

[0037] (11) A heater member for a dehumidifying device, wherein,

[0038] It includes a honeycomb structure and a pair of electrodes provided on the honeycomb structure. The honeycomb structure has an outer peripheral wall and partition walls. The partition walls are disposed inside the outer peripheral wall and divide to form a plurality of compartments. The plurality of compartments form flow paths extending from a first end face to a second end face. At least the partition walls are made of a material having PTC characteristics,

[0039] The Curie point of the material having PTC characteristics is 30 to 70 °C.

[0040] (12) The heater member for a dehumidifying device according to (11), wherein,

[0041] The material having PTC characteristics is mainly composed of barium titanate.

[0042] (13) The heater member for a dehumidifying device according to (12), wherein,

[0043] The barium titanate is one or more selected from the following [i] to [iii]:

[0044] [i](Ba 1-x-y Sr x A y )TiO 3 (wherein, A represents one or more rare earth elements, x is 0.15 to 0.25, and y is 0.0001 to 0.01)

[0045] [ii](Ba 1-x-y Sn x A y )TiO 3 (wherein, A represents one or more rare earth elements, x is 0.05 to 0.15, and y is 0.0001 to 0.01)

[0046] [iii](Ba 1-x-y Zr x A y )TiO 3 (wherein, A represents one or more rare earth elements, x is 0.12 to 0.18, and y is 0.0001 to 0.01)

[0047] (14) A vehicle compartment dehumidifying system, which includes:

[0048] (1) The dehumidifying device according to any one of (1) to (10);

[0049] A storage battery capable of applying a voltage to the dehumidifying device;

[0050] An inflow pipe connecting the vehicle compartment and the inflow port of the dehumidifying device;

[0051] An outflow pipe connecting the outflow port of the dehumidifying device to the vehicle compartment and the outside of the vehicle; and

[0052] A switching valve provided in the outflow pipe, capable of switching the air flow flowing through the outflow pipe to the vehicle compartment or the outside of the vehicle.

[0053] Advantages of the Invention

[0054] According to the present invention, it is possible to provide a dehumidifying device with a high regeneration efficiency of the dehumidifying material, which can be miniaturized and has reduced power consumption, a heater member for a dehumidifying device useful for manufacturing the dehumidifying device, and a vehicle compartment dehumidifying system including the dehumidifying device. Description of the Drawings

[0055] Figure 1 It is a schematic view of the first end face side of the dehumidifying device according to an embodiment of the present invention.

[0056] Figure 2 Is Figure 1 A cross-sectional schematic view taken along line a - a' of

[0057] Figure 3 It is a schematic view of the first end face side of the dehumidifying device according to another embodiment of the present invention.

[0058] Figure 4 Is Figure 3 A cross-sectional schematic view taken along line a - a' of

[0059] Figure 5 It is a schematic view showing the configuration of a vehicle compartment dehumidifying system according to an embodiment of the present invention.

[0060] Figure 6 It is a schematic view showing the configuration of a vehicle compartment dehumidifying system according to another embodiment of the present invention. Detailed Embodiments

[0061] The dehumidifying device according to an embodiment of the present invention includes a heater member and a dehumidifying material layer. The heater member includes a honeycomb structure body and a pair of electrodes provided on the honeycomb structure body. The honeycomb structure body has an outer peripheral wall and partition walls. The partition walls are disposed inside the outer peripheral wall and define a plurality of compartments. The plurality of compartments form flow paths extending from a first end face to a second end face. At least the partition walls are made of a material having PTC (Positive Temperature Coefficient) characteristics. The dehumidifying material layer is provided on the surface of the partition walls and contains a dehumidifying material having a water release temperature of 30 to 70°C.

[0062] Here, in this specification, the "water release temperature" of the dehumidifying material means the temperature at which the moisture adsorbed on the dehumidifying material can be released.

[0063] By adopting the above-described configuration, the dehumidifying device according to an embodiment of the present invention can omit the space for separately arranging the dehumidifying material different from the heater member. Therefore, it can be miniaturized. In addition, since the heater member directly heats the dehumidifying material layer, the regeneration efficiency of the dehumidifying material can be improved. Further, since the water release temperature of the dehumidifying material contained in the dehumidifying material layer is controlled, the amount of power required to increase the heating temperature can also be reduced.

[0064] In addition, the heater member for a dehumidifying device according to an embodiment of the present invention includes a honeycomb structure body and a pair of electrodes provided on the honeycomb structure body. The honeycomb structure body has an outer peripheral wall and partition walls. The partition walls are disposed inside the outer peripheral wall and define a plurality of compartments. The plurality of compartments form flow paths extending from a first end face to a second end face. At least the partition walls are made of a material having PTC characteristics, and the Curie point of the material having PTC characteristics is 30 to 70°C.

[0065] By adopting the above-described configuration, the heater member for a dehumidifying device according to an embodiment of the present invention can provide a dehumidifying material layer containing a dehumidifying material having a water release temperature of 30 to 70°C.

[0066] Furthermore, the vehicle compartment dehumidifying system according to an embodiment of the present invention includes: the above-described dehumidifying device; a storage battery capable of applying a voltage to the dehumidifying device; an inflow pipe connecting the vehicle compartment and the inflow port of the dehumidifying device; an outflow pipe connecting the outflow port of the dehumidifying device and the vehicle compartment and the outside of the vehicle; and a switching valve provided in the outflow pipe and capable of switching the air flow flowing through the outflow pipe to the vehicle compartment or the outside of the vehicle.

[0067] By adopting the above-described configuration, the vehicle compartment dehumidifying system according to an embodiment of the present invention can be miniaturized and the power consumption can be reduced.

[0068] Hereinafter, embodiments of the present invention will be specifically described with reference to the accompanying drawings. The present invention is not limited to the following embodiments, and it should be understood that: within the scope not departing from the gist of the present invention, solutions obtained by appropriately modifying, improving, etc. the following embodiments based on the general knowledge of those skilled in the art also fall within the scope of the present invention.

[0069] (1. Dehumidifying device)

[0070] The dehumidifying device according to the embodiment of the present invention can be well used for adjusting the indoor humidity in various vehicles such as automobiles. As the vehicle, there is no particular limitation, and examples can include automobiles and electric trains. As for the automobile, there is no particular limitation, and examples can include gasoline vehicles, diesel vehicles, gaseous fuel vehicles using CNG (compressed natural gas), LNG (liquefied natural gas), etc., fuel cell vehicles, electric vehicles, and plug-in hybrid vehicles. The dehumidifying device according to the embodiment of the present invention can be particularly well used for vehicles without an internal combustion engine such as electric vehicles and electric trains.

[0071] In addition, the dehumidifying device according to the embodiment of the present invention can be used not only for vehicles but also for adjusting the indoor humidity of buildings such as houses, offices, factories, stores, and warehouses, and means of transportation such as ships and airplanes.

[0072] Figure 1 It is a schematic view of the first end face side of the dehumidifying device 100 according to an embodiment of the present invention. Figure 2 is Figure 1 The cross-sectional schematic view of the a - a' line of. Figure 3 It is a schematic view of the first end face side of the dehumidifying device 100 according to another embodiment of the present invention. Figure 4 is Figure 3 The cross-sectional schematic view of the a - a' line of.

[0073] The dehumidifying device 100 includes: a heater member including a honeycomb structure body and a pair of electrodes (a first electrode 110a and a second electrode 110b) provided on the honeycomb structure body, the honeycomb structure body having an outer peripheral wall 101 and partition walls 102 disposed inside the outer peripheral wall 101; and a dehumidifying material-containing layer 120 provided on the surface of the partition walls 102. The partition walls 102 demarcate and form a plurality of compartments 104, and the plurality of compartments 104 serve as flow paths extending from the first end face 103a to the second end face 103b.

[0074] Hereinafter, each component of the dehumidifying device 100 will be described in detail.

[0075] (1 - 1. Heater member)

[0076] (A) Honeycomb structure body

[0077] Regarding the shape of the honeycomb structure, it has an outer peripheral wall 101 and partition walls 102. The partition walls 102 are disposed inside the outer peripheral wall 101 and demarcate a plurality of compartments 104, and it is sufficient that the plurality of compartments 104 form flow paths extending from the first end face 103a to the second end face 103b, and there is no particular limitation. For example, the outer shape of the cross section of the honeycomb structure orthogonal to the direction in which the flow path extends (the direction in which the compartments 104 extend) can be a polygon (quadrilateral (rectangle, square), pentagon, hexagon, heptagon, octagon, etc.), an arc shape (circle, ellipse, egg shape, oval shape, oblong shape, a quadrilateral with a curvature (a quadrilateral formed by curves for each side and each angle and having a larger radius of curvature for each side than for each angle and being entirely formed by curves), etc.). In addition, when the outer shape of this cross section is a polygon, the corners can be chamfered. For the reason of preventing the honeycomb structure from being damaged and facilitating the installation of other components such as a cushioning material on the surface of the outer peripheral wall 101, the corners are particularly preferably shaped with an R chamfer. It should be noted that the end faces (the first end face 103a and the second end face 103b) have the same shape as this cross section. Figure 1 and Figure 2 In the dehumidifying device 100 of, a case where the outer shape of the cross section of the honeycomb structure is circular and the overall outer shape of the honeycomb structure is cylindrical is shown as an example. Figure 3 and Figure 4 In the dehumidifying device 100 of, a case where the outer shape of the cross section of the honeycomb structure is a rectangle with an R chamfer and the overall outer shape of the honeycomb structure is a quadrangular prism with an R chamfer is shown as an example.

[0078] The opening shape of the compartment 104 is not particularly limited. In the cross section of the honeycomb structure orthogonal to the direction in which the flow path extends, it can be a polygon (quadrilateral (rectangle, square), pentagon, hexagon, heptagon, octagon, etc.), an arc shape (circle, ellipse, egg shape, oval shape, oblong shape, etc.). These shapes can be single, or two or more kinds can be combined. In addition, among these shapes, a quadrilateral or a hexagon is preferred. By providing the compartment 104 with such a shape, the pressure loss during air circulation can be reduced. When the opening shape of the compartment 104 is a polygon, the corners can be R chamfered. It should be noted that Figures 1 to 4 In the dehumidifying device 100 of, a case where the opening shape of the compartment 104 of the honeycomb structure is a square is shown as an example.

[0079] The honeycomb structure may be a honeycomb bonded body having a plurality of honeycomb cells and a bonding layer that indirectly bonds the outer peripheral surfaces of the plurality of honeycomb cells (the outer peripheral surfaces of the honeycomb cells that are parallel to the direction in which the flow path extends). By using the honeycomb bonded body, the occurrence of cracking can be suppressed and the total cross-sectional area of the compartments 104, which is important for ensuring the air flow rate, can be increased. A bonding material can be used to form the bonding layer. There is no particular limitation on the bonding material, and a material obtained by adding a solvent such as water to a ceramic material and making it into a paste form can be used. The bonding material may contain a material having PTC characteristics, or may contain the same material as the outer peripheral wall 101 and the partition wall 102. In addition to the function of bonding the honeycomb cells to each other, the bonding material can also be used as an outer peripheral coating material after the honeycomb cells are bonded.

[0080] Regarding the thickness of the partition wall 102, the cell density, and the cell pitch (or the opening ratio of the compartment 104), it is preferably appropriately determined in consideration of ensuring the strength of the honeycomb structure, reducing the pressure loss when air passes through the compartment 104, ensuring the loading amount of the dehumidifying material layer 120, ensuring the contact area with the air flowing in the compartment 104, and the resistance between the end faces.

[0081] In this specification, the "thickness of the partition wall 102" refers to: in a cross-section orthogonal to the direction in which the flow path extends, when the centers of gravity of adjacent compartments 104 are connected by a line segment, the length of the line segment passing through the partition wall 102. The thickness of the partition wall 102 refers to the average value of the thicknesses of all the partition walls 102.

[0082] In this specification, the "cell density" refers to: the value obtained by dividing the number of cells by the area of one end face of the honeycomb structure (the total area of the partition walls 102 and the compartments 104 excluding the outer peripheral wall 101).

[0083] In this specification, the "cell pitch" refers to the value obtained by the following calculation. First, the area of one end face of the honeycomb structure (the total area of the partition walls 102 and the compartments 104 excluding the outer peripheral wall 101) is divided by the number of cells to calculate the area of each cell. Next, the square root of the area of each cell is calculated and set as the cell pitch.

[0084] In this specification, the "opening ratio of the compartment 104" refers to: the value obtained by dividing the total area of the compartments 104 delimited by the partition wall 102 in a cross-section orthogonal to the direction in which the flow path extends of the honeycomb structure by the area of one end face (the total area of the partition walls 102 and the compartments 104 excluding the outer peripheral wall 101). It should be noted that when calculating the opening ratio of the compartment 104, layers provided on the partition wall 102 such as a pair of electrodes (the first electrode 110a and the second electrode 110b) and the dehumidifying material layer 120 are not considered.

[0085] As a preferable embodiment from the viewpoint of supporting a sufficient amount of the dehumidifying material layer 120, the thickness of the partition wall 102 is 0.180 mm or less, the compartment density is 100 compartments / cm 2 or less, and the compartment pitch is 1.0 mm or more. As a preferable embodiment, the thickness of the partition wall 102 is 0.150 mm or less, the compartment density is 95 compartments / cm 2 or less, and the compartment pitch is 1.2 mm or more. As a more preferable embodiment, the thickness of the partition wall 102 is 0.120 mm or less, the compartment density is 90 compartments / cm 2 or less, and the compartment pitch is 1.3 mm or more.

[0086] From the viewpoint of ensuring the strength of the honeycomb structure and maintaining a low resistance, the lower limit of the thickness of the partition wall 102 is preferably 0.010 mm or more, more preferably 0.020 mm or more, and still more preferably 0.030 mm or more.

[0087] From the viewpoints of ensuring the strength of the honeycomb structure, maintaining a low resistance, increasing the surface area, and promoting reactions, adsorption, and desorption based on the dehumidifying material layer 120, the lower limit of the compartment density is preferably 30 compartments / cm 2 or more, more preferably 35 compartments / cm 2 or more, and still more preferably 40 compartments / cm 2 or more.

[0088] From the viewpoints of ensuring the strength of the honeycomb structure, maintaining a low resistance, increasing the surface area, and promoting reactions, adsorption, and desorption based on the dehumidifying material layer 120, the upper limit of the compartment pitch is preferably 2.0 mm or less, more preferably 1.8 mm or less, and still more preferably 1.6 mm or less.

[0089] As a preferable embodiment from the viewpoint of reducing the pressure loss and maintaining the strength, the thickness of the partition wall 102 is 0.08 mm to 0.36 mm, the compartment density is 2.54 compartments / cm 2 to 140 compartments / cm 2 , and the opening ratio of the compartment 104 is 0.70 or more. As a preferable embodiment, the thickness of the partition wall 102 is 0.09 mm to 0.35 mm, the compartment density is 15 compartments / cm 2 to 100 compartments / cm 2 , and the opening ratio of the compartment 104 is 0.75 or more. As a more preferable embodiment, the thickness of the partition wall 102 is 0.10 mm to 0.30 mm, the compartment density is 20 compartments / cm 2 to 90 compartments / cm 2 , and the opening ratio of the compartment 104 is 0.77 or more.

[0090] From the viewpoint of ensuring the strength of the honeycomb structure, the upper limit of the opening ratio of the compartment 104 is preferably 0.94 or less, more preferably 0.92 or less, and still more preferably 0.90 or less.

[0091] The thickness of the outer peripheral wall 101 is not particularly limited and is preferably determined based on the following viewpoints. First, from the viewpoint of reinforcing the honeycomb structure portion, the thickness of the outer peripheral wall 101 is preferably 0.05 mm or more, more preferably 0.06 mm or more, and still more preferably 0.08 mm or more. On the other hand, from the viewpoints of increasing the resistance to suppress the initial current and reducing the pressure loss during air flow, the thickness of the outer peripheral wall 101 is preferably 1.0 mm or less, more preferably 0.5 mm or less, still more preferably 0.4 mm or less, and even more preferably 0.3 mm or less.

[0092] In this specification, the thickness of the outer peripheral wall 101 means: in a cross section orthogonal to the direction in which the flow path extends, the length in the normal direction of the outer peripheral surface from the boundary between the outer peripheral wall 101 and the outermost peripheral side compartment 104 or partition wall 102 to the outer peripheral surface of the honeycomb structure.

[0093] The length in the direction in which the flow path of the honeycomb structure extends and the cross-sectional area orthogonal to the direction in which the flow path extends can be adjusted according to the size of the required dehumidifying device 100 and are not particularly limited. For example, in the case of the dehumidifying device 100 that ensures a specified function and is compact, for the honeycomb structure, the length in the direction in which the flow path extends can be set to 2 to 50 mm, typically 5 to 50 mm, and the cross-sectional area orthogonal to the direction in which the flow path extends can be set to 30 to 400 cm 2 and typically set to 50 to 150 cm 2 .

[0094] The partition wall 102 constituting the honeycomb structure portion is made of a material capable of generating heat by energization, specifically made of a material having PTC characteristics. If necessary, the outer peripheral wall 101 can be made of a material having PTC characteristics in the same manner as the partition wall 102.

[0095] Since the dehumidifying material layer 120 is provided on the partition wall 102, the dehumidifying material layer 120 can be directly heated by heat transfer from the heated partition wall 102 (and the outer peripheral wall 101 if necessary). In addition, the material having PTC characteristics has the following characteristics: when the temperature rises and exceeds the Curie point, the resistance value rises sharply, making it difficult for current to flow. Therefore, regarding the partition wall 102 (and the outer peripheral wall 101 if necessary), when the heater member reaches a high temperature, the current flowing through them is restricted, so that overheating of the heater member is suppressed. Therefore, thermal deterioration of the dehumidifying material layer 120 caused by overheating can also be suppressed.

[0096] From the viewpoint of obtaining moderate heat generation, the lower limit of the volume resistivity of the material having PTC characteristics at 25°C is preferably 0.1 Ω·cm or more, more preferably 0.5 Ω·cm or more, further preferably 1 Ω·cm or more, and still further preferably 2 Ω·cm or more. From the viewpoint of causing it to generate heat at a low driving voltage, the upper limit of the volume resistivity of the material having PTC characteristics at 25°C is preferably 50 Ω·cm or less, more preferably 30 Ω·cm or less, still more preferably 18 Ω·cm or less, and further preferably 16 Ω·cm or less. Therefore, the range of the volume resistivity of the material having PTC characteristics at 25°C can be, for example, 0.1 Ω·cm to 50 Ω·cm. In this specification, the volume resistivity of the material having PTC characteristics at 25°C is measured in accordance with JIS K6271:2008.

[0097] From the viewpoint of being able to conduct electricity and generate heat and having PTC characteristics, the outer peripheral wall 101 and the partition wall 102 are preferably made of a material mainly composed of barium titanate (BaTiO 3 ), and more preferably a ceramic composed of a material mainly composed of barium titanate (BaTiO 3 )-based crystal particles in which a part of Ba is replaced by a rare earth element. It should be noted that in this specification, "main component" means: a component that occupies a proportion of more than 50% by mass in the overall composition. The content of BaTiO 3 -based crystal particles can be determined by fluorescent X-ray analysis. Other crystal particles can also be measured in the same manner as this method.

[0098] The compositional formula of BaTiO 3 -based crystal particles in which a part of Ba is replaced by a rare earth element can be represented by (Ba 1-x A x )TiO 3 . In the compositional formula, A represents one or more rare earth elements, and 0.0001 ≤ x ≤ 0.010.

[0099] A being a rare earth element is sufficient and is not particularly limited. It is preferably one or more selected from 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 excessive 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 excessive resistance at room temperature due to insufficient sintering, x is preferably 0.009 or less.

[0100] BaTiO 3The content of the crystal particles in the ceramic only needs to reach the amount of the main component, and there is no particular limitation. It is preferably 90% by mass or more, more preferably 92% by mass or more, and still more preferably 94% by mass or more. It should be noted that BaTiO 3 There is no particular limitation on the upper limit value of the content of the crystal particles of the BaTiO system, and it is usually 99% by mass or less, preferably 98% by mass or less.

[0101] From the viewpoint of reducing the environmental load, the materials used for the outer peripheral wall 101 and the partition wall 102 preferably contain substantially no lead (Pb). Specifically, the Pb content in the outer peripheral wall 101 and the partition wall 102 is preferably 0.01% by mass or less, more preferably 0.001% by mass or less, and still more preferably 0% by mass. By having a small Pb content, it is possible to safely blow, for example, the air heated by contacting the partition wall 102 during heating towards a living being such as a human. It should be noted that in the outer peripheral wall 101 and the partition wall 102, the Pb content is preferably less than 0.03% by mass in terms of PbO conversion, more preferably less than 0.01% by mass, and still more preferably 0% by mass. The content of lead can be determined by ICP-MS (Inductively Coupled Plasma Mass Spectrometry).

[0102] In conventional heater components, the Curie point of the materials constituting the outer peripheral wall and the partition wall is usually a high temperature of 100°C to 300°C. Therefore, a dehumidifying material having a water release temperature in this temperature range is used for the dehumidifying material layer containing the dehumidifying material. However, this dehumidifying material requires a high temperature of 100°C or more for releasing the adsorbed moisture and regenerating, so the required power consumption increases. As a result, the power consumption of the storage battery increases, and for example, the cruising range of an electric vehicle decreases. In addition, due to a high temperature of 100°C or more, it has a thermal impact on the housing component for accommodating the heater component and other surrounding components, and sometimes affects their functions and durability.

[0103] On the contrary, the dehumidifying material layer 120 used in the dehumidifying device 100 uses a dehumidifying material having a water release temperature of 30 to 70°C. Therefore, it is also possible to lower the Curie point of the materials constituting the outer peripheral wall 101 and the partition wall 102. From the viewpoint of efficiently heating the dehumidifying material layer 120, the Curie point of the materials constituting the outer peripheral wall 101 and the partition wall 102 is preferably 30°C or more, more preferably 40°C or more, and still more preferably 50°C or more. In addition, from the viewpoints of the safety as a component placed indoors, especially in a vehicle compartment or near the vehicle compartment, and reducing the required power consumption, the Curie point is preferably 70°C or less, more preferably 60°C or less, and still more preferably 50°C or less. Therefore, the range of the Curie point of the materials constituting the outer peripheral wall 101 and the partition wall 102 can be set to, for example, 30°C to 70°C.

[0104] It should be noted that the Curie point of the materials constituting the outer peripheral wall 101 and the partition wall 102 can be 100°C or higher. However, in order to be used in the dehumidifying device 100, it is necessary to control the electric power so that the heating temperature of the dehumidifying material layer 120 does not become too high.

[0105] The Curie point of the materials constituting the outer peripheral wall 101 and the partition wall 102 can be adjusted by the type and addition amount of the displacement agent. For example, the Curie point of barium titanate (BaTiO 3 ) is about 120°C. However, by replacing a part of Ba and Ti with one or more of Sr, Sn, and Zr, the Curie point can be shifted to the low temperature side.

[0106] The barium titanate having a Curie point of 30°C to 70°C is not particularly limited. For example, it can be represented by the following compositional formulas [i] to [iii].

[0107] [i] (Ba 1-x-y Sr x A y )TiO 3 (In the formula, A represents one or more rare earth elements, x is 0.15 to 0.25, and y is 0.0001 to 0.01)

[0108] [ii] (Ba 1-x-y Sn x A y )TiO 3 (In the formula, A represents one or more rare earth elements, x is 0.05 to 0.15, and y is 0.0001 to 0.01)

[0109] [iii] (Ba 1-x-y Zr x A y )TiO 3 (In the formula, A represents one or more rare earth elements, x is 0.12 to 0.18, and y is 0.0001 to 0.01)

[0110] In this specification, the Curie point is measured by the following method. The specimen is installed on the specimen holder for measurement and assembled in the measurement tank (for example, MINI-SUBZERO MC-810P manufactured by ESPEC CORPORATION). Using a DC resistance meter (for example, multimeter 3478 manufactured by YOKOGAWA HEWLETT PACKARD, LTD), the change in the resistance of the specimen with temperature during heating from 10°C is measured. Based on the measured resistance-temperature curve, the temperature at which the resistance value reaches twice the resistance value at room temperature (20°C) is set as the Curie point.

[0111] (B) Electrodes

[0112] A pair of electrodes (first electrode 110a and second electrode 110b) are provided at any part of the honeycomb structure. The pair of electrodes can be provided at opposed positions, for example, the first end face 103a and the second end face 103b of the honeycomb structure, or the surfaces of the outer peripheral wall 101 of the honeycomb structure parallel to the direction in which the flow paths extend. In particular, from the viewpoint of efficiently heating the honeycomb structure, it is preferable to provide the pair of electrodes on the first end face 103a and the second end face 103b of the honeycomb structure. That is, the first electrode 110a is provided on the first end face 103a, and the second electrode 110b is provided on the second end face 103b. And, by applying a voltage between the first electrode 110a and the second electrode 110b, the honeycomb structure can be heated by Joule heat.

[0113] Specifically, the first electrode 110a covers a part or all of the surface of the partition wall 102 forming the first end face 103a. The second electrode 110b covers a part or all of the surface of the partition wall 102 forming the second end face 103b. In order to facilitate the overall spread of current on the first end face 103a, the first electrode 110a preferably covers 80% or more, more preferably 90% or more, and still more preferably 99% or more of the area of the portion (partition wall portion and outer peripheral wall portion) of the first end face 103a other than the opening of the compartment 104. Similarly, in order to facilitate the overall spread of current on the second end face 103b, the second electrode 110b preferably covers 80% or more, more preferably 90% or more, and still more preferably 99% or more of the area of the portion (partition wall portion and outer peripheral wall portion) of the second end face 103b other than the opening of the compartment 104.

[0114] The first electrode 110a and the second electrode 110b are not particularly limited. For example, a metal or alloy containing at least one selected from Cu, Ag, Al, Ni, and Si can be used. In a preferred embodiment, the first electrode 110a and the second electrode 110b contain pure aluminum and / or an aluminum alloy. Additionally, an ohmic electrode capable of making ohmic contact with the outer peripheral wall 101 and / or the partition wall 102 having PTC characteristics can also be used. Regarding the ohmic electrode, for example, an ohmic electrode having at least one selected from Al, Au, Ag, and In as a base metal and at least one selected from Ni, Si, Zn, Ge, Sn, Se, and Te for an n-type semiconductor as a dopant can be used. Further, the first electrode 110a and the second electrode 110b can have a single-layer structure or a laminated structure of two or more layers. When the first electrode 110a and the second electrode 110b have a laminated structure of two or more layers, the materials of each layer can be of the same type or different types. In a preferred embodiment, the first electrode 110a and the second electrode 110b have a single layer of pure aluminum, a two-layer structure of an Al-Ni alloy layer and a pure silver layer, a two-layer structure of a pure aluminum layer and a pure silver layer, or a two-layer structure of an Al-Ni alloy layer and a pure aluminum layer.

[0115] The thicknesses of the first electrode 110a and the second electrode 110b are not particularly limited and can be appropriately set according to the formation method of the first electrode 110a and the second electrode 110b. Examples of the formation method of the first electrode 110a and the second electrode 110b include metal deposition methods such as sputtering, evaporation plating, electrolytic deposition, and chemical deposition. Additionally, the electrode can also be formed by sintering or spraying after applying an electrode paste. Further, the electrode can also be formed by bonding a metal plate or alloy plate such as a perforated metal having through holes to a portion corresponding to the opening of the compartment 104.

[0116] The average thickness of the first electrode 110a and the second electrode 110b is not limited and can be, for example, 5 μm or more and 100 μm or less. By setting the lower limit of the average thickness of the first electrode 110a and the second electrode 110b to 5 μm or more, preferably 10 μm or more, and more preferably 20 μm or more, the advantage of avoiding abnormal heat generation at the electrode can be obtained. By setting the upper limit of the average thickness of the first electrode 110a and the second electrode 110b to 100 μm or less, preferably 80 μm or less, and more preferably 60 μm or less, the advantage of suppressing the rigidity of the electrode and being difficult to peel off from the end face of the honeycomb structure can be obtained.

[0117] The average thickness of the first electrode 110a is measured in the following order. First, a cross-sectional image of the first electrode 110a at a magnification of about 50 times is obtained using a scanning electron microscope or the like. This cross-section is a cross-section of the honeycomb structure parallel to the direction in which the flow path extends. In the cross-sectional image, since the first electrode 110a is seen in each partition wall 102, for each first electrode 110a, the thickness at the central position of the length in the direction perpendicular to the direction in which the flow path extends of the partition wall 102 forming the first end face 103a covered by the first electrode 110a is measured. The thickness direction is the direction parallel to the direction in which the flow path extends. And, a large number of cross-sectional images of the first electrode 110a are obtained without bias from the vicinity of the first end face 103a of the heater member, and the thicknesses of five or more first electrodes 110a are measured. The average value of all the measured thicknesses is set as the average thickness of the first electrode 110a. The average thickness of the second electrode 110b is also measured in the same order.

[0118] There is no particular limitation on the lower limit of the volume resistivity of the first electrode 110a and the second electrode 110b at 25°C, and the generally achievable range is 1.0×10 -7 Ω·cm or more. From the viewpoint of allowing the current to sufficiently spread over the surface to make the temperature distribution uniform, the upper limit of the volume resistivity of the first electrode 110a and the second electrode 110b at 25°C is preferably 1.0×10 -5 Ω·cm or less, more preferably 1.0×10 -6 Ω·cm or less, more preferably 5.0×10 -7 Ω·cm or less, and further preferably 3.0×10 -7 Ω·cm or less. Therefore, the range of the volume resistivity of the first electrode 110a and the second electrode 110b at 25°C can be, for example, 1.0×10 -7 Ω·cm or more and 1.0×10 -5 Ω·cm or less. In this specification, the volume resistivity of the first electrode 110a and the second electrode 110b at 25°C is measured in accordance with JIS K6271:2008.

[0119] (C) Terminals

[0120] From the viewpoint of facilitating connection to an external power source, the heater member may further include terminals (first terminal 111a and second terminal 111b) connected to a pair of electrodes (first electrode 110a and second electrode 110b). The first terminal 111a is connected to a part of the outer surface of the first electrode 110a. In addition, the second terminal 111b is connected to a part of the outer surface of the second electrode 110b.

[0121] Regarding the connection method between the first electrode 110a and the first terminal 111a and between the second electrode 110b and the second terminal 111b, it is only necessary that they are electrically connected, and there is no particular limitation. For example, they can be connected by welding, brazing, or mechanical contact, etc. There is no particular limitation on the material of the first terminal 111a and the second terminal 111b. For example, a metal can be used. As the metal, a simple metal and an alloy, etc. can be used. However, from the viewpoint of selecting a material that is difficult to oxidize in a high-humidity environment, is not likely to cause migration, electrolytic corrosion even under humid conditions, and is easy to bond with the electrode, it is preferable to contain one or more selected from pure aluminum, aluminum alloy, and stainless steel. For example, it can be made of pure aluminum, aluminum alloy, or stainless steel. In addition, an alloy containing at least one selected from the group consisting of Cr, Fe, Co, Ni, Cu, and Ti can also be used. Among them, Fe-Ni alloy and phosphor bronze can be used well. From the viewpoint of avoiding electrolytic corrosion, the terminal is preferably a material close to that of the electrode layer on the end face. Exemplarily, it is preferable that both the electrode layer and the terminal are pure aluminum and / or aluminum alloy.

[0122] The shapes of the first terminal 111a and the second terminal 111b are not limited. For example, they can be in a flat plate shape. The plate thickness of the terminal at this time is not limited. For example, it can be 0.1 to 4 mm, preferably 0.3 to 2 mm.

[0123] The area of the portion of the first end face 103a covered by the first terminal 111a is not particularly limited. If the first terminal 111a is too small, it will be difficult to connect the energizing component to the first terminal 111a. On the contrary, if the first terminal 111a is too large, the area blocking the opening of the compartment 104 will become larger, and the flow rate of the air that can flow through the heater member will decrease. Thus, with respect to the area of the first end face 103a, the lower limit of the ratio of the area of the first terminal 111a covering the first end face 103a is preferably 0.5% or more, more preferably 1% or more, and further preferably 2% or more. In addition, with respect to the area of the first end face 103a, the upper limit of the ratio of the area of the first terminal 111a covering the first end face 103a is preferably 10% or less, more preferably 8% or less, and further preferably 5% or less. Therefore, with respect to the area of the first end face 103a, the range of the ratio of the area of the first terminal 111a covering the first end face 103a can be, for example, 0.5% to 10%. The ratio of the area of the second terminal 111b covering the second end face 103b is the same with respect to the area of the second end face 103b.

[0124] There is no particular limitation on the lower limit of the volume resistivity of the first terminal 111a and the second terminal 111b at 25 °C. The generally achievable range is 1.0×10 -7Ω·cm or more. From the viewpoint of reducing heat generation and energy loss at the terminals, the upper limit of the volume resistivity of the first terminal 111a and the second terminal 111b at 25 °C is preferably 1.0×10 -6 Ω·cm or less, more preferably 5.0×10 -7 Ω·cm or less, more preferably 3.0×10 -7 Ω·cm or less, still more preferably 2.0×10 -7 Ω·cm or less. Therefore, the range of the volume resistivity of the first terminal 111a and the second terminal 111b at 25 °C can be, for example, 1.0×10 -7 Ω·cm or more and 1.0×10 -6 Ω·cm or less. In this specification, the volume resistivity of the first terminal 111a and the second terminal 111b at 25 °C is measured in accordance with JIS K6271:2008.

[0125] (D) Electrically conductive component

[0126] From the viewpoint of facilitating connection to an external power source, the heater member may further include electrically conductive components (the first electrically conductive component 112a and the second electrically conductive component 112b) connected to the terminals. The first electrically conductive component 112a and the second electrically conductive component 112b are respectively connected to the first terminal 111a and the second terminal 111b.

[0127] Examples of the conductive material constituting the first electrically conductive component 112a and the second electrically conductive component 112b include: stainless steel, aluminum, aluminum alloy, copper alloy, and copper. Regarding the connection method between the first terminal 111a and the first electrically conductive component 112a and between the second terminal 111b and the second electrically conductive component 112b, it is sufficient that both are conductive, and there is no particular limitation. For example, they can be connected by welding, brazing, or mechanical contact, etc. In one aspect, the first electrically conductive component 112a and the second electrically conductive component 112b can be the wire itself between the external power source and the first terminal 111a (second terminal 111b), that is, a copper wire, a copper alloy wire, an aluminum wire, an aluminum alloy wire, or a stainless steel wire. In another aspect, the first electrically conductive component 112a and the second electrically conductive component 112b can also be an intermediate component that connects the wire and the first terminal 111a (second terminal 111b). The intermediate component can be connected to the wire by any method such as welding, soldering, brazing, riveting, and bolt fastening, or other methods.

[0128] (1-2. Containing a dehumidifying material layer)

[0129] The dehumidifying material layer 120 contains a dehumidifying material with a water release temperature of 30 to 70°C. By using such a dehumidifying material, the adsorbed moisture can be released and regenerated in the low temperature range of 30 to 70°C. Therefore, the amount of electricity required for the regeneration of the dehumidifying material layer 120 can be reduced, thereby reducing the consumption of the electricity stored in the storage battery. Thus, the cruising range of the electric vehicle can be extended. The water release temperature of the dehumidifying material is preferably 35 to 65°C, more preferably 40 to 60°C.

[0130] Here, in this specification, the dehumidifying material refers to a substance having the following property: when placed in an environment of room temperature (25°C) and relative humidity of 50% for one hour, the mass (g) of water that can be adsorbed per 1 g of its own dry mass is 5 g / g or more. This dehumidifying material is also called a moisture-absorbing material. The moisture-absorbing material preferably adsorbs moisture at -20°C to less than 30°C.

[0131] The dehumidifying material has the function of adsorbing moisture at -20°C to less than 30°C and desorbing it at 30 to 70°C. Therefore, by repeatedly applying and removing power, the function of the dehumidifying material can be repeatedly obtained.

[0132] The temperature difference between the water release temperature of the dehumidifying material and the Curie point temperature of the material having PTC characteristics (the material constituting the outer peripheral wall 101 and the partition wall 102 of the honeycomb structure) is preferably within ±10°C, more preferably within ±8°C, and further preferably within ±5°C. By adopting such a configuration, it is possible to suppress the dehumidifying material from being overheated and deteriorated. Therefore, the function of the dehumidifying material layer 120 can be maintained for a long time.

[0133] Regarding the type of the dehumidifying material, it is only necessary that the water release temperature is 30 to 70°C, and there is no particular limitation. Examples include: aluminosilicate, silica gel, silicon dioxide, graphene oxide, polymer adsorbent, polystyrene sulfonic acid, and metal-organic framework (MOF: Metal Organic Framework). These materials can be used alone or in combination of two or more.

[0134] As the aluminosilicate, it is preferable to use: zeolites of AFI type, CHA type or BEA type; porous clay minerals such as allophane and imogolite. In addition, the aluminosilicate is preferably amorphous.

[0135] As the silica gel, it is preferable to use type A silica gel.

[0136] As the polymer adsorbent, it preferably has a polyacrylic acid-based polymer chain. For example, as the polymer adsorbent, sodium polyacrylate etc. can be used.

[0137] The metal-organic structure is a crystalline hybrid material containing metal ions and organic molecules (organic ligands). The metal ions are preferably metal ions with hydrophilicity (such as aluminum ions).

[0138] The dehumidifying material-containing layer 120 may further contain an adhesive. By containing an adhesive, the holding function of the dehumidifying material-containing layer 120 with respect to the surface of the partition wall 102 can be improved. As the adhesive, both organic adhesives and inorganic adhesives can be mentioned, but inorganic adhesives are preferred. The type of the inorganic adhesive is not particularly limited, and examples thereof include alumina sol, silica sol, montmorillonite, boehmite, γ-alumina, and palygorskite. These adhesives can be used alone or in combination of two or more. Among them, alumina sol and silica sol are preferred for the reason that adhesion can be easily ensured, and silica sol is more preferred.

[0139] The dehumidifying material-containing layer 120 may further contain an antibacterial material. By containing an antibacterial material, it is possible to suppress the reduction of the function of the dehumidifying material-containing layer 120 due to mildew or the like and the deterioration of the environment inside the vehicle compartment caused by the scattering of mold into the vehicle compartment. Regarding the type of the antibacterial material, it is sufficient that it has an antibacterial effect and does not hinder the function of the dehumidifying material, and there is no particular limitation. For example, visible light-responsive photocatalysts such as titanium oxide, silver, copper, and zinc can be mentioned. These antibacterial materials can be used alone or in combination of two or more. In addition, among them, titanium oxide is preferred, and porous titanium oxide is more preferred.

[0140] The average thickness of the dehumidifying material-containing layer 120 is not particularly limited, and for example, it can be 10 μm or more and 500 μm or less. By setting the lower limit of the average thickness of the dehumidifying material-containing layer 120 to 10 μm or more, preferably 30 μm or more, and more preferably 50 μm or more, the moisture absorption performance can be sufficiently ensured. By setting the upper limit of the average thickness of the dehumidifying material-containing layer 120 to 500 μm or less, preferably 300 μm or less, and more preferably 200 μm or less, the rigidity of the dehumidifying material-containing layer 120 can be reduced, and it is difficult to peel off.

[0141] The average thickness of the dehumidifying material layer 120 is measured in the following order. First, a cross-sectional image of the dehumidifying material layer 120 at about 50 times magnification is obtained using a scanning electron microscope or the like. This cross-section is a cross-section of the honeycomb structure parallel to the direction in which the flow path extends. In the cross-sectional image, two dehumidifying material layers 120 sandwiching the partition wall 102 are seen in each partition wall 102. Therefore, the total cross-sectional area from the first end face 103a to the second end face 103b of each dehumidifying material layer 120 is divided by the length of the partition wall 102 covered by the dehumidifying material layer 120 from the first end face 103a to the second end face 103b to calculate the thickness of each dehumidifying material layer 120. And a large number of cross-sectional images of the dehumidifying material layer 120 are obtained without bias, and the thicknesses of 5 or more dehumidifying material layers 120 are measured. The average value of the thicknesses of all the measured dehumidifying material layers 120 is set as the average thickness of the dehumidifying material layer 120.

[0142] The dehumidifying material layer 120 is provided on the surface of the partition wall 102. In addition, the dehumidifying material layer 120 can also be provided on a part of the outer surfaces of the first electrode 110a and the second electrode 110b. Furthermore, the dehumidifying material layer 120 can also be provided on the sides of the first electrode 110a and the second electrode 110b. By adopting such a configuration, it is possible to suppress short circuits between the electrodes caused by the migration of metal components in the electrodes.

[0143] Here, the outer surface of the first electrode 110a refers to the surface on the opposite side of the surface of the first electrode 110a that contacts the first end face 103a. The outer surface of the second electrode 110b refers to the surface on the opposite side of the surface of the second electrode 110b that contacts the second end face 103b. In addition, the side surface of the first electrode 110a refers to the surface of the first electrode 110a parallel to the thickness direction. The side surface of the second electrode 110b refers to the surface of the second electrode 110b parallel to the thickness direction.

[0144] The reason for providing the dehumidifying material layer 120 on "a part" of the outer surface of the first electrode 110a is that the part of the outer surface of the first electrode 110a connected to the first terminal 111a should not be provided with the dehumidifying material layer 120. Similarly, the reason for providing the dehumidifying material layer 120 on "a part" of the outer surface of the second electrode 110b is that the part of the outer surface of the second electrode 110b connected to the second terminal 111b should not be provided with the dehumidifying material layer 120.

[0145] In order to improve the effect of preventing short circuits, the dehumidifying material layer 120 is preferably disposed on more than 80% of the area of the portion of the outer surface of the first electrode 110a that is not connected to the first terminal 111a, more preferably on more than 90%, and still more preferably on more than 99%. Similarly, the dehumidifying material layer 120 is preferably disposed on more than 80% of the area of the portion of the outer surface of the second electrode 110b that is not connected to the second terminal 111b, more preferably on more than 90%, and still more preferably on more than 99%.

[0146] (1 - 3. Other additional components)

[0147] The dehumidifying device 100 may further include additional components known in the art as needed. For example, the dehumidifying device 100 may further include a housing capable of holding the heater member. Through the protective action of the housing, the heater member is not easily damaged when disposed in the ventilation path, and in addition, electrical insulation from surrounding components can be ensured, and a shape that is easily assembled into the air conditioning system is presented.

[0148] There is no particular limitation on the housing for holding the heater member. The housing according to one embodiment may be configured to be able to clamp the heater member from the side of the first end face 103a and the second end face 103b. The housing according to another embodiment may be configured to be able to hold the heater member from the outer peripheral surface side of the outer peripheral wall 101.

[0149] (2. Manufacturing method of the dehumidifying device)

[0150] Next, an exemplary manufacturing method of the dehumidifying device 100 will be described.

[0151] First, the manufacturing method of the honeycomb structure body constituting the heater member includes a molding process and a firing process.

[0152] In the molding process, a green body of a ceramic raw material containing powders of BaCO 3 powder, TiO 2 powder, and nitrates or hydroxides of rare earths is molded to produce a honeycomb green body with a relative density of 60% or more.

[0153] By dry - mixing the powders according to a desired composition, a ceramic raw material can be obtained.

[0154] By adding a dispersion medium, a binder, a plasticizer, and a dispersant to the ceramic raw material and kneading, a green body can be obtained. Additives such as a displacement agent, a metal oxide, a property improver, and a conductive powder can be contained in the green body as needed.

[0155] The compounding quantity of the components other than the ceramic raw materials may be such a quantity that the relative density of the honeycomb green body reaches 60% or more, and there is no particular limitation.

[0156] Here, the "relative density of the honeycomb green body" in this specification means the ratio of the density of the honeycomb green body to the true density of the whole ceramic raw materials. Specifically, it can be solved by the following formula.

[0157] Relative density of honeycomb green body (%) = Density of honeycomb green body (g / cm 3 ) / True density of whole ceramic raw materials (g / cm 3 ) × 100

[0158] The density of the honeycomb green body can be measured by the Archimedes' method using pure water as the medium. In addition, the true density of the whole ceramic raw materials can be obtained by dividing the total mass value (g) of each raw material by the total actual volume value (cm 3 ) of each raw material.

[0159] Examples of the dispersion medium include water, or a mixed solvent of water and an organic solvent such as alcohol, etc. However, water can be particularly preferably used.

[0160] Examples of the binder include organic binders such as methyl cellulose, hydroxypropoxy cellulose, hydroxyethyl cellulose, carboxymethyl cellulose, and polyvinyl alcohol. It is particularly preferred to use a combination of methyl cellulose and hydroxypropoxy cellulose. The binder can be used alone or in combination of two or more, and preferably does not contain alkali metal elements.

[0161] Examples of the plasticizer include polyoxyalkylene alkyl ether, polycarboxylic acid-based polymer, alkyl phosphate ester, etc.

[0162] As the dispersant, surfactants such as polyoxyalkylene alkyl ether, ethylene glycol, dextrin, fatty acid soap, and polyhydric alcohol can be used. The dispersant can be used alone or in combination of two or more.

[0163] The honeycomb green body can be produced by extrusion molding of the blank. During extrusion molding, a die having a desired overall shape, compartment shape, partition wall thickness, compartment density, etc. can be used.

[0164] The lower limit of the relative density of the honeycomb green body obtained by extrusion molding is preferably 60% or more, more preferably 65% or more. By controlling the relative density of the honeycomb green body within such a range, the honeycomb green body can be densified, and the resistance at room temperature can be reduced. It should be noted that the upper limit of the relative density of the honeycomb green body is not particularly limited, and is usually 80% or less, preferably 75% or less.

[0165] The honeycomb formed body can be dried before the firing process. The drying method is not particularly limited, and 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. Among them, in terms of being able to quickly and uniformly dry the entire formed body, a drying method that combines hot air drying and microwave drying or dielectric drying is preferred.

[0166] The firing process includes: after maintaining at 1150 - 1250 °C, raising the temperature to the maximum temperature of 1360 - 1430 °C at a heating rate of 20 - 600 °C / hour, and maintaining for 0.5 - 10 hours.

[0167] By maintaining the honeycomb formed body at the maximum temperature of 1360 - 1430 °C for 0.5 - 10 hours, a honeycomb structure part mainly composed of BaTiO crystal particles in which a part of Ba is replaced by a rare earth element can be obtained. 3 system crystal particles as the main component.

[0168] In addition, by maintaining at 1150 - 1250 °C, the Ba 2 TiO 4 crystal particles generated during the firing process are easily removed, and thus, the honeycomb structure part can be densified.

[0169] Furthermore, by setting the heating rate from 1150 - 1250 °C to the maximum temperature of 1360 - 1430 °C to 20 - 600 °C / hour, 1.0 - 10.0 mass% of Ba 6 Ti 17 O 40 crystal particles can be generated in the honeycomb structure part.

[0170] The holding time at 1150 - 1250 °C is not particularly limited, and preferably 0.5 - 10 hours. By setting the holding time like this, the Ba 2 TiO 4 crystal particles generated during the firing process are easily and stably removed.

[0171] The firing process preferably includes: during heating, maintaining at 900 - 950 °C for 0.5 - 5 hours. By maintaining at 900 - 950 °C for 0.5 - 5 hours, BaCO 3 is efficiently decomposed, and it is easy to obtain a honeycomb structure body with a specified composition.

[0172] It should be noted that before the firing process, a degreasing process for removing the binder can be performed. The atmosphere of the degreasing process is preferably set to an air atmosphere in order to completely decompose the organic components.

[0173] In addition, from the viewpoints of controlling electrical characteristics and manufacturing costs, the atmosphere of the firing process is also preferably set to an air atmosphere.

[0174] As the firing furnace used in the firing process and the debinding process, there is no particular limitation, and an electric furnace, a gas furnace, etc. can be used.

[0175] A pair of electrodes (the first electrode 110a and the second electrode 110b) are joined to the honeycomb structure thus obtained. The first electrode 110a and the second electrode 110b can be formed on the first end face 103a and the second end face 103b of the honeycomb structure by a metal deposition method such as sputtering, evaporation, electrolytic deposition, or chemical deposition. Alternatively, the first electrode 110a and the second electrode 110b can be formed by applying an electrode paste to the first end face 103a and the second end face 103b of the honeycomb structure and then sintering. In addition, they can also be formed by spraying. The first electrode 110a and the second electrode 110b can be composed of a single layer or multiple electrode layers with different compositions. When the first electrode 110a and the second electrode 110b are formed on the end face by the above method, if the thickness of the electrode is set to not be too large, the compartments 104 can be prevented from being blocked.

[0176] The method for forming the first electrode 110a and the second electrode 110b is not limited, and examples include: sintering of an electrode paste, dry plating such as sputtering and evaporation, spraying, wet plating such as electrolytic deposition and chemical deposition, and joining of a metal plate or an alloy plate. There is a preferred thickness range for each method. In the sintering of the electrode paste, the preferred thickness range can be about 5 to 30 μm. In dry plating such as sputtering and evaporation, the preferred thickness range can be about 100 to 1000 nm. In spraying, the preferred thickness range can be about 10 to 100 μm. In wet plating such as electrolytic deposition and chemical deposition, the preferred thickness range can be about 5 to 30 μm. In addition, in the joining of a metal plate or an alloy plate, the thickness of the electrode can be about 5 to 100 μm.

[0177] Next, the first terminal 111a is connected to the outer surface of the first electrode 110a, and the second terminal 111b is connected to the outer surface of the second electrode 110b. As the connection method for both, as described above, methods such as welding, brazing, or mechanical contact can be cited. In addition, when sintering the electrode paste used for forming the first electrode 110a (the second electrode 110b), the first terminal 111a (the second terminal 111b) can be sintered simultaneously for connection.

[0178] Next, the first power supply member 112a and the second power supply member 112b are respectively connected to the first terminal 111a and the second terminal 111b as needed. As the connection method for both, as described above, methods such as welding, brazing, or mechanical contact can be cited.

[0179] A dehumidifying material layer 120 is formed at a specified position of the heater member obtained as described above. Specifically, the dehumidifying material layer 120 is provided on the surface of the partition wall 102 of the honeycomb structure constituting the heater member, on a part of the outer surface of the first electrode 110a and the second electrode 110b, or on the side surface. The dehumidifying material layers 120 formed at each position may be formed separately or simultaneously.

[0180] The dehumidifying material layer 120 can be formed simultaneously, for example, by the following process. The heater member before forming the dehumidifying material layer 120 is immersed in a slurry containing a dehumidifying material, and optionally containing an antibacterial material, an adhesive, a dispersion medium, etc. for a specified time, and the excess slurry on the outer peripheral surface of the honeycomb structure is removed by blowing and wiping. Thereafter, the dehumidifying material layer 120 can be formed by drying the slurry. For example, drying can be performed in a state where the heater member is heated to a temperature of about 120 to 600 °C. The series of processes of impregnation, slurry removal, and drying can be performed only once, but the dehumidifying material layer 120 with a desired thickness can be formed by repeating multiple times.

[0181] As the adhesive, an organic adhesive can be used, but an inorganic adhesive is preferably used because there is a possibility that smoke may be generated by heat and the components in the smoke may flow into the vehicle compartment, deteriorating the vehicle compartment environment. The preferred types of inorganic adhesives are as described above.

[0182] As the dispersion medium, 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 can be adopted.

[0183] (3. Vehicle Compartment Dehumidification System)

[0184] The vehicle compartment dehumidification system according to an embodiment of the present invention can be used in various vehicles such as automobiles. In particular, the vehicle compartment dehumidification system according to an embodiment of the present invention can be well used in vehicles without an internal combustion engine such as electric vehicles and trams.

[0185] It should be noted that the vehicle compartment dehumidification system according to an embodiment of the present invention can also be used for humidity adjustment in indoor spaces of buildings such as houses, offices, factories, stores, warehouses, cold storages, and in means of transportation such as ships and airplanes.

[0186] (3-1. Configuration Example 1 of Vehicle Compartment Dehumidification System)

[0187] Figure 5 It is a schematic diagram showing the configuration of a vehicle compartment dehumidification system 1000 according to an embodiment of the present invention.

[0188] The vehicle compartment dehumidification system 1000 includes: a dehumidification device 100; a storage battery 200 that can apply a voltage to the dehumidification device 100; an inflow pipe 400 that connects the vehicle compartment and the inflow port (inlet end face) of the dehumidification device 100; an outflow pipe 500 that connects the outflow port (outlet end face) of the dehumidification device 100 to the inside or outside of the vehicle; and a switching valve 300 that is provided in the outflow pipe 500 and can switch the air flow flowing through the outflow pipe 500 to the vehicle compartment or the outside of the vehicle. The outflow pipe 500 has: a first path 500a that connects the outflow port (outlet end face) of the dehumidification device 100 to the inside of the vehicle; and a second path 500b that connects the outflow port (outlet end face) of the dehumidification device 100 to the outside of the vehicle. In addition, the vehicle compartment dehumidification system 1000 further includes a ventilator 600 that is used to cause the air from the vehicle compartment to flow into the inflow port (inlet end face) of the dehumidification device 100 via the inflow pipe 400.

[0189] Figure 5 In the illustrated vehicle compartment dehumidification system 1000, the dehumidification device 100 is configured such that: the inflow port (inlet end face) is the first end face 103a, and the outflow port (outlet end face) is the second end face 103b. However, the dehumidification device 100 can also be configured such that: the inflow port is the second end face 103b, and the outflow port is the first end face 103a. The dehumidification device 100 can be one, or multiple can be configured in series or in parallel.

[0190] The vehicle compartment dehumidification system 1000 can have the following operation modes:

[0191] In the first mode, the applied voltage from the storage battery 200 is disconnected, the switching valve 300 is switched so that the air flowing through the outflow pipe 500 passes through the first path 500a, and the ventilator 600 is turned on;

[0192] In the second mode, the applied voltage from the storage battery 200 is turned on, the switching valve 300 is switched so that the air flowing through the outflow pipe 500 passes through the second path 500b, and the ventilator 600 is turned on.

[0193] The vehicle compartment dehumidification system 1000 can include: a control unit 900 that can perform the switching between the first mode and the second mode. The control unit 900 can be configured, for example, to be able to alternately execute the first mode and the second mode. By repeatedly switching between the first mode and the second mode in a certain cycle, the moisture (water vapor) in the vehicle compartment can be stably discharged to the outside of the vehicle.

[0194] In the first mode, moisture in the air is removed. Specifically, air from the passenger compartment flows through the inflow pipe 400 and into the dehumidifying device 100 through the inflow port (inlet end face) of the dehumidifying device 100. After passing through the dehumidifying device 100, it flows out from the outflow port (outlet end face) of the dehumidifying device 100. The moisture in the air from the passenger compartment is adsorbed onto the dehumidifying material containing the dehumidifying material layer 120 and removed during the passage through the dehumidifying device 100. The air with moisture removed flowing out from the outflow port (outlet end face) of the dehumidifying device 100 passes through the first path 500a of the outflow pipe 500 and is sent back to the passenger compartment. This air can also be supplied to other air conditioning systems (e.g., the vehicle's HVAC).

[0195] In the second mode, the dehumidifying material containing the dehumidifying material layer 120 is regenerated. Specifically, air from the passenger compartment flows through the inflow pipe 400 and into the dehumidifying device 100 through the inflow port (inlet end face) of the dehumidifying device 100. After passing through the dehumidifying device 100, it flows out from the outflow port (outlet end face) of the dehumidifying device 100. The dehumidifying device 100 generates heat by being energized, whereby the dehumidifying material layer 120 carried on the dehumidifying device 100 is heated. Therefore, the moisture adsorbed on the dehumidifying material layer 120 is released (detached) from the dehumidifying material layer 120.

[0196] To promote the release of the moisture adsorbed on the dehumidifying material layer 120, it is preferable to heat the dehumidifying material above the water release temperature according to the type of the dehumidifying material. For example, at least a part of the dehumidifying material, preferably all of it, is heated to 30 to 70 °C, more preferably heated to 35 to 65 °C, and further preferably heated to 40 to 60 °C. In addition, in the second mode, it is preferable to perform for a time required for sufficient regeneration of the dehumidifying material. Although it also depends on the type of the dehumidifying material, for example, the dehumidifying material is preferably heated for 1 to 10 minutes, more preferably heated for 2 to 8 minutes, and further preferably heated for 3 to 6 minutes within the above temperature range.

[0197] In the second mode, the air from the passenger compartment flows out from the outflow port (outlet end face) of the dehumidifying device 100, carrying the moisture released from the dehumidifying material during the passage through the dehumidifying device 100. The air containing moisture flowing out from the outflow port (outlet end face) of the dehumidifying device 100 passes through the second path 500b of the outflow pipe 500 and is discharged to the outside of the vehicle.

[0198] For example, by electrically connecting a pair of terminals (the first terminal 111a and the second terminal 111b) of the storage battery 200 and the dehumidifying device 100 with a wire 810 and operating the power switch 910 provided in the middle thereof, it is possible to switch the application of voltage to the dehumidifying device 100 between on and off. The control unit 900 can execute the operation of the power switch 910.

[0199] For example, by electrically connecting the control unit 900 and the ventilator 600 by wire 820 or wirelessly, and operating the switch (not shown) of the ventilator 600 using the control unit 900, it is possible to switch between turning on and off the ventilator 600. The ventilator 600 can also be configured such that the ventilation volume can be changed by the control unit 900.

[0200] For example, by electrically connecting the control unit 900 and the switching valve 300 by wire 830 or wirelessly, and operating the switch (not shown) of the switching valve 300 using the control unit 900, it is possible to perform the switching of the switching valve 300.

[0201] As the switching valve 300, any valve that is electrically driven and has the function of switching the flow path can be used, and there is no particular limitation. Examples include solenoid valves and electric valves. In one aspect, the switching valve 300 includes: an opening and closing door 312 supported by a rotating shaft 310, and an actuator 314 such as a motor that performs a turning operation on the rotating shaft 310. The actuator 314 is configured to be controllable by the control unit 900.

[0202] Regarding the vehicle compartment dehumidification system 1000, from the viewpoint of stably ensuring the above functions, it is preferable that the dehumidification device 100 is arranged close to the vehicle compartment. Accordingly, from the viewpoint of preventing electric shock and the like, the driving voltage is preferably 60V or less. Since the honeycomb structure used in the dehumidification device 100 has a low resistance at room temperature, the honeycomb structure can be heated with this low driving voltage. It should be noted that the lower limit of the driving voltage is not particularly limited, and is preferably 10V or more. If the driving voltage is less than 10V, the current when heating the honeycomb structure becomes large, and therefore, it is necessary to thicken the wire 810. Therefore, the driving voltage of the vehicle compartment dehumidification system 1000 can be, for example, 10V or more and 60V or less.

[0203] Figure 5 In the illustrated embodiment, the ventilator 600 is arranged on the upstream side of the dehumidification device 100. More specifically, the ventilator 600 is arranged in the middle of the inflow pipe 400 that connects the dehumidification device 100 and the interior of the room, and the air that has passed through the ventilator 600 flows in a manner of being pressed into the dehumidification device 100. As another method, the ventilator 600 can be arranged on the downstream side of the dehumidification device 100. In this case, the ventilator 600 can be arranged, for example, in the middle of the outflow pipe 500, and the air that has passed through the inflow pipe 400 flows in a manner of being sucked into the dehumidification device 100.

[0204] (3 - 2. Configuration Example 2 of Vehicle Compartment Dehumidification System)

[0205] Figure 6 It is a schematic diagram showing the configuration of a vehicle compartment dehumidification system 2000 according to another embodiment of the present invention.

[0206] The vehicle compartment dehumidification system 2000 includes: a first dehumidification device 100A; a storage battery 200 capable of applying a voltage to the first dehumidification device 100A; a first inflow pipe 400A that connects the vehicle compartment and the inflow port (inlet end face) of the first dehumidification device 100A; an outflow pipe 500A having a first path 500a that connects the outflow port (outlet end face) of the first dehumidification device 100A and the vehicle compartment and a second path 500b that connects the outflow port (outlet end face) of the first dehumidification device 100A and the outside of the vehicle; and a switching valve 300A capable of switching the air flow flowing through the outflow pipe 500A between the first path 500a and the second path 500b.

[0207] In addition, the vehicle compartment dehumidification system 2000 includes: a second dehumidification device 100B; a storage battery 200 capable of applying a voltage to the second dehumidification device 100B; a second inflow pipe 400B that connects the vehicle compartment and the inflow port (inlet end face) of the second dehumidification device 100B; an outflow pipe 500B having a first path 500c that connects the outflow port (outlet end face) of the second dehumidification device 100B and the vehicle compartment and a second path 500d that connects the outflow port (outlet end face) of the second dehumidification device 100B and the outside of the vehicle; and a switching valve 300B capable of switching the air flow flowing through the outflow pipe 500B between the first path 500c and the second path 500d.

[0208] In addition, the vehicle compartment dehumidification system 2000 includes: an inflow pipe 400 that branches into a first inflow pipe 400A and a second inflow pipe 400B on the downstream side; and a ventilator 600 for causing air from the vehicle compartment to flow into the inflow ports (inlet end faces) of the first dehumidification device 100A and the second dehumidification device 100B via the inflow pipe 400.

[0209] In the vehicle compartment dehumidification system 2000, the first dehumidification device 100A and the second dehumidification device 100B are configured such that the inflow port (inlet end face) is the first end face 103a and the outflow port (outlet end face) is the second end face 103b. However, the first dehumidification device 100A and the second dehumidification device 100B may also be configured such that the inflow port (inlet end face) is the second end face 103b and the outflow port (outlet end face) is the first end face 103a. The first dehumidification device 100A and the second dehumidification device 100B may each have one, or may be configured in series or in parallel with multiple units.

[0210] The vehicle compartment dehumidification system 2000 may include a switching valve 300C that can switch the air flow flowing through the inflow pipe 400 between the first inflow pipe 400A and the second inflow pipe 400B. The switching valve 300C can also be set to supply the air flow flowing through the inflow pipe 400 to both the first inflow pipe 400A and the second inflow pipe 400B while changing the proportion of the air flowing to both. In addition, the vehicle compartment dehumidification system 2000 has the following advantages: by having two systems, namely, a system passing through the first dehumidification device 100A and a system passing through the second dehumidification device 100B, even if one system fails, the system can continue to operate.

[0211] The vehicle compartment dehumidification system 2000 can operate in the following first mode:

[0212] Turn on the applied voltage from the storage battery 200 to the first dehumidification device 100A.

[0213] Switch the switching valve 300A so that the air flowing through the outflow pipe 500A passes through the second path 500b.

[0214] Turn off the applied voltage from the storage battery 200 to the second dehumidification device 100B.

[0215] Switch the switching valve 300B so that the air flowing through the outflow pipe 500B passes through the first path 500c.

[0216] Set the switching valve 300C so that the air flowing through the inflow pipe 400 can be supplied to both the first inflow pipe 400A and the second inflow pipe 400B.

[0217] Turn on the ventilator 600.

[0218] The vehicle compartment dehumidification system 2000 can operate in the following second mode:

[0219] Turn off the applied voltage from the storage battery 200 to the first dehumidification device 100A.

[0220] Switch the switching valve 300A so that the air flowing through the outflow pipe 500A passes through the first path 500a.

[0221] Turn on the applied voltage from the storage battery 200 to the second dehumidification device 100B.

[0222] Switch the switching valve 300B so that the air flowing through the outflow pipe 500B passes through the second path 500d.

[0223] The switching valve 300C is set in such a way that air flowing through the inflow pipe 400 can be supplied to both the first inflow pipe 400A and the second inflow pipe 400B.

[0224] Turn on the ventilator 600.

[0225] In the first mode, the dehumidifying material in the dehumidifying material layer 120 is regenerated in the first dehumidifying device 100A, while moisture in the air is removed in the second dehumidifying device 100B. In the second mode, moisture in the air is removed in the first dehumidifying device 100A, while the dehumidifying material in the dehumidifying material layer 120 is regenerated in the second dehumidifying device 100B. That is, in the vehicle compartment dehumidification system 2000, regeneration of the dehumidifying material in the dehumidifying material layer 120 and removal of moisture can be carried out simultaneously. When regeneration of the dehumidifying material in the dehumidifying material layer 120 is required in the first dehumidifying device 100A, moisture in the air can be removed in the second dehumidifying device 100B, and vice versa.

[0226] In the first mode, the switching valve 300C is preferably set in such a way that the flow rate of air flowing to the second dehumidifying device 100B increases. In addition, in the second mode, the switching valve 300C is preferably set in such a way that the flow rate of air flowing to the first dehumidifying device 100A increases. Thereby, the performance of the dehumidifying material in the dehumidifying material layer 120 in removing moisture from the air can be improved.

[0227] The air from which moisture has been removed flowing out from the outflow port (outlet end face) of the first dehumidifying device 100A (second dehumidifying device 100B) passes through the first path 500a (first path 500c) of the outflow pipe 500A (outflow pipe 500B) and is sent back to the vehicle compartment. This air can also be supplied to other air conditioning systems (for example: the vehicle's HVAC). The air containing moisture released from the dehumidifying material layer 120 flowing out from the outflow port (outlet end face) of the first dehumidifying device 100A (second dehumidifying device 100B) passes through the second path 500b (second path 500d) of the outflow pipe 500A (outflow pipe 500B) and is discharged to the outside of the vehicle.

[0228] The vehicle compartment dehumidification system 2000 may include: a control unit 900 capable of performing switching between the first mode and the second mode. The control unit 900 can be configured, for example, to alternately execute the first mode and the second mode. By repeatedly switching between the first mode and the second mode in a certain cycle, moisture in the vehicle compartment can be stably discharged to the outside of the vehicle. In particular, according to the vehicle compartment dehumidification system 2000, by alternately repeating the first mode and the second mode, moisture removal can be continuously carried out, and thus the problem that moisture cannot be removed during the regeneration of the dehumidifying material is solved.

[0229] For example, by electrically connecting a pair of terminals (a first terminal 111a and a second terminal 111b) of the storage battery 200 and the first dehumidifying device 100A (the second dehumidifying device 100B) with an electric wire 810 and operating a power switch 910 provided therebetween, it is possible to switch on and off the applied voltage to the first dehumidifying device 100A and the second dehumidifying device 100B. The control unit 900 can perform the operation of the power switch 910.

[0230] For example, by electrically connecting the control unit 900 and the ventilator 600 with an electric wire 820 or wirelessly, and operating a switch (not shown) of the ventilator 600 by the control unit 900, it is possible to switch on and off the ventilator 600. The ventilator 600 can also be configured to be able to change the ventilation volume by the control unit 900.

[0231] For example, by electrically connecting the control unit 900 and the switching valves 300A, 300B, 300C with an electric wire 830 or wirelessly, and operating the switches (not shown) of the switching valves 300A, 300B, 300C by the control unit 900, it is possible to switch the switching valves 300A, 300B, 300C.

[0232] As the switching valves 300A, 300B, 300C, any valves that are electrically driven and have the function of switching flow paths can be used, and there is no particular limitation. Examples include solenoid valves and electric valves. In one aspect, the switching valves 300A, 300B, 300C include: an opening / closing door 312 supported by a rotating shaft 310, and an actuator 314 such as a motor that performs a turning operation on the rotating shaft 310. The actuator 314 is configured to be able to be controlled by the control unit 900.

[0233] Regarding the vehicle compartment dehumidification system 2000, from the viewpoint of stably ensuring the above functions, it is preferable that the first dehumidifying device 100A and the second dehumidifying device 100B are arranged at positions close to the vehicle compartment. Therefore, from the viewpoint of preventing electric shock and the like, it is preferable that the driving voltage is 60V or less. The honeycomb structure used in the first dehumidifying device 100A and the second dehumidifying device 100B has a low resistance at room temperature, and thus the honeycomb structure can be heated with this low driving voltage. It should be noted that the lower limit of the driving voltage is not particularly limited, and it is preferably 10V or more. If the driving voltage is less than 10V, the current when the honeycomb structure is heated becomes large, and thus it is necessary to thicken the electric wire 810. Therefore, the driving voltage of the vehicle compartment dehumidification system 2000 can be set to, for example, 10V or more and 60V or less.

[0234] Figure 6In the illustrated embodiment, the ventilator 600 is provided on the upstream side of the first dehumidifying device 100A and the second dehumidifying device 100B. More specifically, the ventilator 600 is provided midway in the inflow pipe 400, and the air that has passed through the ventilator 600 flows in a manner of being forced into the first dehumidifying device 100A and the second dehumidifying device 100B. As another method, the ventilator 600 may be provided on the downstream side of the first dehumidifying device 100A and the second dehumidifying device 100B. In this case, the ventilator 600 may be provided, for example, midway in the outflow pipes 500A and 500B, and the air that has passed through the inflow pipe 400 flows in a manner of being sucked by the first dehumidifying device 100A and the second dehumidifying device 100B.

[0235] Symbol Explanation

[0236] 100 Dehumidifying device

[0237] 101 Outer peripheral wall

[0238] 102 Partition wall

[0239] 103a First end face

[0240] 103b Second end face

[0241] 104 Compartment

[0242] 110a First electrode

[0243] 110b Second electrode

[0244] 111a First terminal

[0245] 111b Second terminal

[0246] 112a First energizing member

[0247] 112b Second energizing member

[0248] 120 Dehumidifying material-containing layer

[0249] 200 Storage battery

[0250] 300, 300A, 300B, 300C Changeover valve

[0251] 310 Rotating shaft

[0252] 312 Opening / closing door

[0253] 314 Actuator

[0254] 400 Inflow pipe

[0255] 400A First inflow pipe

[0256] 400B Second Inflow Pipe

[0257] 500, 500A, 500B Outflow Pipes

[0258] 500a, 500c First Path

[0259] 500b, 500d Second Path

[0260] 600 Blower

[0261] 810, 820, 830 Electric Wires

[0262] 900 Control Unit

[0263] 910 Power Switch

[0264] 1000, 2000 Compartment Dehumidification System

Claims

1. A dehumidifying device, comprising: a heater member including a honeycomb structure and a pair of electrodes provided on the honeycomb structure, the honeycomb structure having an outer peripheral wall and partition walls, the partition walls being disposed inside the outer peripheral wall and partitioning to form a plurality of compartments, the plurality of compartments serving as flow paths extending from a first end face to a second end face, and at least the partition walls being made of a material having PTC characteristics; and a dehumidifying material-containing layer provided on the surface of the partition walls and containing a dehumidifying material having a water release temperature of 30 to 70°C.

2. The dehumidifying device according to claim 1, wherein, the Curie point of the material having PTC characteristics is 30 to 70°C.

3. The dehumidifying device according to claim 2, wherein, the temperature difference between the water release temperature of the dehumidifying material and the Curie point of the material having PTC characteristics is within ±10°C.

4. The dehumidifying device according to any one of claims 1 to 3, wherein, the dehumidifying material is one or more selected from aluminosilicate, silica gel, silicon dioxide, graphene oxide, polymer adsorbent material, polystyrenesulfonic acid, and metal-organic framework.

5. The dehumidifying device according to any one of claims 1 to 3, wherein, the material having PTC characteristics has barium titanate as the main component.

6. The dehumidifying device according to claim 5, wherein, the barium titanate is one or more selected from the following [i] to [iii]: [i](Ba 1-x-y Sr x A y )TiO 3 , where A represents one or more rare earth elements, x is 0.15 to 0.25, and y is 0.0001 to 0.01; [ii](Ba 1-x-y Sn x A y )TiO 3 , where A represents one or more rare earth elements, x is 0.05 to 0.15, and y is 0.0001 to 0.01; [iii](Ba 1-x-y Zr x A y )TiO 3 , where A represents one or more rare earth elements, x is from 0.12 to 0.18, and y is from 0.0001 to 0.

01.

7. The dehumidifying device according to any one of claims 1 to 3, wherein, the dehumidifying material-containing layer further contains an antibacterial material.

8. The dehumidifying device according to claim 7, wherein, the antibacterial material is one or more selected from visible light-responsive photocatalyst, silver, copper, and zinc.

9. The dehumidifying device according to any one of claims 1 to 3, wherein, the pair of electrodes are provided on the first end face and the second end face.

10. The dehumidifying device according to claim 9, wherein, the dehumidifying device further comprises: terminals connected to the pair of electrodes.

11. A heater member for a dehumidifying device, wherein, it includes a honeycomb structure and a pair of electrodes provided on the honeycomb structure, the honeycomb structure having an outer peripheral wall and partition walls, the partition walls being disposed inside the outer peripheral wall and partitioning to form a plurality of compartments, the plurality of compartments serving as flow paths extending from a first end face to a second end face, and at least the partition walls being made of a material having PTC characteristics, the Curie point of the material having PTC characteristics is 30 to 70°C.

12. The heater member for a dehumidifying device according to claim 11, wherein, the material having PTC characteristics has barium titanate as the main component.

13. The heater member for a dehumidifying device according to claim 12, wherein, the barium titanate is one or more selected from the following [i] to [iii]: [i](Ba 1-x-y Sr x A y )TiO 3 , where A represents one or more rare earth elements, x is 0.15 to 0.25, and y is 0.0001 to 0.01; [ii](Ba 1-x-y Sn x A y )TiO 3 , where A represents one or more rare earth elements, x is 0.05 to 0.15, and y is 0.0001 to 0.01; [iii](Ba 1-x-y Zr x A y )TiO 3 , where A represents one or more rare earth elements, x is 0.12 to 0.18, and y is 0.0001 to 0.

01.

14. A vehicle compartment dehumidifying system, comprising: the dehumidifying device according to any one of claims 1 to 3; a storage battery capable of applying a voltage to the dehumidifying device; an inflow pipe connecting the vehicle compartment and the inflow port of the dehumidifying device; An outflow pipe that connects the outflow port of the dehumidifying device to the passenger compartment and the outside of the vehicle; and A switching valve that is provided in the outflow pipe and can switch the air flow flowing through the outflow pipe to the passenger compartment or the outside of the vehicle.

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