Total heat exchanger and ventilation system

Abstract

The airflow resistance is high. [Solution] The total heat exchanger (100) comprises a first frame (110) including a first rib (114), a second frame (120) including a second rib (124), and a partition membrane (130). The first rib and the second rib form a plurality of flow paths (F) through which first air and second air flow. The partition membrane separates the first frame and the second frame. The first frame has an inlet, an outlet, and a facing section. The inlet includes an inlet for first air, through which first air flows intersecting with second air. The outlet includes an outlet for first air, through which first air flows intersecting with second air. In the facing section, first air flows opposite to second air. In the inlet and / or outlet, the flow path (F) has a first flow path (F1) having a straight section of a first length and a second flow path (F2) having a straight section shorter than the first length. The width of the straight section in the first channel (WA1) is greater than the width of the straight section in the second channel (WA2).

Description

Technical Field

[0001] It relates to a total heat exchanger and a ventilation device.

Background Art

[0002] Patent Document 1 (Japanese Patent Application Laid-Open No. 2008-70070) discloses a total heat exchanger that exchanges heat between supply air and exhaust air. The total heat exchanger of Patent Document 1 has a counterflow section (rectangular section) in which the supply air and the exhaust air flow parallel to each other and in opposite directions, and a crossflow section (triangular section) in which the supply air and the exhaust air flow intersectingly. Further, the total heat exchanger of Patent Document 1 is formed by laminating a plurality of heat exchange members each comprising a partition film and a flow path forming member fixed to the partition film. The flow path forming member is composed of two frame members and thin rib members. The frame members are disposed along the outer edge of the partition film. A plurality of thin rib members are disposed between the pair of frame members with parallel and equal-width dimensions.

Summary of the Invention

Problems to be Solved by the Invention

[0003] In the above Patent Document 1, the lengths of the flow paths formed by the thin rib members in the crossflow section (triangular section) are different from each other. Therefore, the long flow path has a greater ventilation resistance (pressure loss) than the short flow path.

Means for Solving the Problems

[0004] A total heat exchanger according to the first aspect comprises a first frame, a second frame, and a partition membrane. The first frame includes first ribs. The first ribs form a plurality of passages through which first air flows. The second frame includes second ribs. The second ribs form a plurality of passages through which second air flows. The partition membrane separates the first frame from the second frame. The first frame has an inlet, an outlet, and a facing section. The inlet includes an inlet for first air, through which first air flows intersecting with second air. The outlet includes an outlet for first air, through which first air flows intersecting with second air. The facing section is located between the inlet and the outlet, and through which first air flows opposite to second air. In at least one of the inlet and the outlet, the passage has a first passage and a second passage. The first passage has a straight section of a first length. The second passage has a straight section shorter than the first length. The width of the straight section in the first channel is greater than the width of the straight section in the second channel.

[0005] Flow channels with long straight sections have high airflow resistance. Therefore, in the total heat exchanger from the first perspective, the width of the first flow channel with a long straight section is made larger than the width of the second flow channel with a short straight section. This reduces the airflow resistance of the first flow channel. Consequently, the airflow resistance of the total heat exchanger can be reduced.

[0006] The total heat exchanger according to the second aspect is the total heat exchanger according to the first aspect, wherein the first rib is bent from at least one of the first air inlet and outlet to widen the width of the first flow path.

[0007] In the second aspect of the total heat exchanger, the width of the first flow path is increased by bending the first rib. This makes it possible to further reduce the airflow resistance of the first flow path.

[0008] The total heat exchanger according to the third perspective is the total heat exchanger according to the second perspective, wherein the first flow path widens at least on one side of the inlet and outlet of the first air.

[0009] In the third aspect of the total heat exchanger, the airflow resistance of the first flow path can be more effectively reduced by widening the width of at least one of the inlet and outlet sides of the first flow path.

[0010] A total heat exchanger relating to the fourth viewpoint is a total heat exchanger relating to either the first viewpoint or the third viewpoint, wherein the width of the inlet of the first air in the first flow path is the same as the width of the inlet of the first air in the second flow path, and / or the width of the outlet of the first air in the first flow path is the same as the width of the outlet of the first air in the second flow path.

[0011] In the fourth aspect of the total heat exchanger, the width of the straight sections is compared in the first and second flow paths, under the same conditions for at least one of the inlet and outlet. Therefore, a total heat exchanger with low airflow resistance can be easily realized.

[0012] A total heat exchanger according to the fifth aspect is a total heat exchanger according to any of the first or fourth aspects, wherein the first frame further includes reinforcing ribs arranged to intersect the first flow path.

[0013] In the fifth aspect of the total heat exchanger, reinforcing ribs are provided, which reinforces the strength of the ribs forming the first flow path, which are widened due to their long first length.

[0014] A total heat exchanger relating to the sixth viewpoint is a total heat exchanger relating to any of the first viewpoints or the fifth viewpoint, wherein the width of the straight section in the first flow path is 1.1 times or more the width of the straight section in the second flow path.

[0015] In the total heat exchanger from the sixth perspective, the width of the straight section in the first flow path is set to 1.1 times or more the width of the straight section in the second flow path, thereby reducing the airflow resistance of the first flow path.

[0016] A total heat exchanger relating to the seventh viewpoint is a total heat exchanger relating to either the first viewpoint or the sixth viewpoint, wherein the ratio of the width of the straight section to the width of the opposing section in the first flow path is greater than the ratio of the width of the straight section to the width of the opposing section in the second flow path.

[0017] In the total heat exchanger of the present disclosure, since the width of the first flow path with a long flow path length is made larger than the width of the second flow path with a short flow path length, like the total heat exchanger of the seventh aspect, the ratio of the width of the straight part to the width of the opposing part in the first flow path (width of the straight part / width of the opposing part) may be made larger than the ratio of the width of the straight part to the width of the opposing part in the second flow path (width of the straight part / width of the opposing part).

[0018] The total heat exchanger according to the eighth aspect is a total heat exchanger according to any one of the first to seventh aspects, and in the first flow path, the width of the opposing part is larger than the width of the straight part.

[0019] Like the total heat exchanger of the eighth aspect, the width of the opposing part of the first flow path may be made larger than the width of the straight part of the first flow path.

[0020] The ventilation device according to the ninth aspect includes a total heat exchanger according to any one of the first to eighth aspects. In the total heat exchanger, the supply air supplied from the outside to the inside as the first air and the exhaust air discharged from the inside to the outside as the second air are heat-exchanged. <000007​​​​​​​​​​​​​​​​​​​​​​​​​​​It is a cross-sectional view of the partition film. [Figure 8] In FIG. 3, the side plates are omitted, and a state where the guide portion of the fixing member is not removed is shown. [Figure 9] In FIG. 8, a state where the top plate is omitted is shown. [Figure 10] In FIG. 8, an enlarged view of one fixing member near the top plate is shown. [Figure 11] In FIGS. 8 and 9, an enlarged view of one fixing member near the bottom plate is shown. [[ID=XXX]] [[ID=XXX]]

Mode for Carrying Out the Invention

[0023] The total heat exchanger and the ventilation device according to an embodiment of the present disclosure will be described while referring to the drawings.

[0024] (1) Ventilation device FIG. 1 is a schematic view of a ventilation device including the total heat exchanger 100 of the present embodiment. As shown in FIG. 1, the ventilation device 1 includes the total heat exchanger 100 and exchanges the air inside the building. Here, the ventilation device 1 discharges the air RA in the indoor space to the outside space of the building and supplies the air OA in the outside space of the building to the indoor space.

[0025] The ventilation device 1 includes the total heat exchanger 100, a casing 2, a supply air fan 3, and an exhaust fan 4.

[0026] The total heat exchanger 100 exchanges heat between the supply air SA supplied from the outside to the inside as the first air and the exhaust air EA discharged from the inside to the outside as the second air. The total heat exchanger 100 will be described later.

[0027] The casing 2 houses the total heat exchanger 100. The casing 2 is provided with a first suction port 21, a supply air port 22, a second suction port 23, and an exhaust port 24. The first suction port 21 sucks the outside air OA as the first air. The supply air port 22 supplies the air SA as the first air to the indoor space. The second suction port 23 sucks the indoor air RA as the second air. The exhaust port 24 discharges the exhaust air EA as the second air to the outside. Note: There are some tags like and in the original text which seem to be some kind of reference tags without specific content for translation. They are just preserved as they are in the translation. Also, the reference to "XXX" in the translation for those tags is just to show the original tag number clearly in the context.

[0028] Furthermore, an air supply passage 25 and an exhaust passage 26 are formed in the internal space of the casing 2. The air supply passage 25 has a first intake port 21 connected to one end and an air supply port 22 connected to the other end. The exhaust passage 26 has a second intake port 23 connected to one end and an exhaust port 24 connected to the other end. In the ventilation device 1, outdoor air flows into the room through the air supply passage 25, and indoor air flows outwards through the exhaust passage 26.

[0029] The supply air fan 3 is positioned downstream of the total heat exchanger 100 in the supply air passage 25. The supply air fan 3 generates a first airflow.

[0030] The exhaust fan 4 is positioned downstream of the total heat exchanger 100 in the exhaust passage 26. The exhaust fan 4 generates a second airflow.

[0031] (2) Total heat exchanger (2-1) Overall structure The total heat exchanger 100 is installed in the ventilation device 1. In Figure 1, the total heat exchanger 100 is positioned to traverse the supply air passage 25 and the exhaust air passage 26.

[0032] The total heat exchanger 100 simultaneously exchanges latent and sensible heat. Specifically, the total heat exchanger 100 exchanges sensible heat and latent heat (moisture) between the outdoor air supplied from outside to inside (supply air) and the indoor air discharged to outside (exhaust air).

[0033] Figure 2 is a schematic diagram showing a simplified external view of the total heat exchanger 100 in this embodiment. Figure 3 is a perspective view of the total heat exchanger 100, with most of the first frame 110 and second frame 120 and the partition membrane 130 omitted, which will be described later. In other words, Figure 3 is a perspective view of the total heat exchanger 100, showing the front first frame 110 and second frame 120, the central first frame 110 and second frame 120, and the rear first frame 110 and second frame 120. As shown in Figures 2 and 3, the total heat exchanger 100 has a prism shape with polygonal end faces, and the total heat exchanger 100 in this embodiment has an octagonal prism shape.

[0034] In the following description, expressions indicating direction such as "up," "down," "left," "right," "front," and "back" are used as appropriate. Unless otherwise specified, these expressions follow the directions of the arrows drawn in Figures 2 and 3. These expressions for directions and positions are used for the convenience of explanation, and unless otherwise specified, the orientation and position of the total heat exchanger 100 and each component are not limited to the orientation and position of the expressions described. In this embodiment, the up and down direction is defined as the vertical direction.

[0035] The total heat exchanger 100 mainly comprises a top plate 101, a bottom plate 102, a side plate 103, a first frame 110, a second frame 120, a partition membrane 130, as shown in Figure 4, and a fixing member 140, as shown in Figure 3.

[0036] The first frame 110 and the second frame 120 overlap alternately. The first frame 110 forms a channel through which the first air flows. The second frame 120 forms a second channel through which the second air flows.

[0037] As shown in Figure 1, the first frame 110 includes a first inlet 112 through which the first air flows in, and a first outlet 113 through which the first air flows out. The first inlet 112 and the first outlet 113 communicate with the flow path through which the first air flows. The second frame 120 includes a second inlet 122 through which the second air flows in, and a second outlet 123 through which the second air flows out. The second inlet 122 and the second outlet 123 communicate with the flow path through which the second air flows.

[0038] Figure 4 is a diagram that shows the relationship between the first frame 110, the second frame 120, and the partition membrane 130, by separating them.

[0039] As shown in Figure 4, a partition membrane 130 is placed between the first frame 110 and the second frame 120. Therefore, the partition membrane 130 is placed in contact with the first frame 110, the second frame 120 is placed in contact with the partition membrane 130, and the partition membrane 130 is placed in contact with the second frame 120. In this embodiment, the total heat exchanger 100 comprises a plurality of first frames 110, a plurality of second frames 120, and a plurality of partition membranes 130, thus forming a laminate composed of the first frames 110, the second frames 120, and the partition membranes 130. In other words, in the total heat exchanger 100, the plurality of first frames 110, a plurality of second frames 120, and a plurality of partition membranes 130 are stacked. The stacking direction here is the front-to-back direction.

[0040] As shown in Figure 3, the top plate 101, bottom plate 102, and side plates 103 surround the laminate. The top plate 101 is positioned above the laminate (towards the front in Figure 3). The bottom plate 102 is positioned below the laminate (towards the rear in Figure 3). The side plates 103 are positioned to the sides of the portion of the laminate where the first inlet 112, first outlet 113, second inlet 122, and second outlet 123 are not formed.

[0041] In this embodiment, as shown in Figure 2, the total heat exchanger 100 has one side plate 103 as its mounting surface. Therefore, this side plate 103, one side of the top plate 101, and one side of the bottom plate 102 form the lowest surface 104 of the total heat exchanger 100.

[0042] As shown in Figure 3, the fixing member 140 holds a plurality of first frames 110, a plurality of second frames 120, and a plurality of partition membranes 130.

[0043] (2-2) Detailed Configuration (2-2-1) First frame Figure 5 is a plan view showing the first frame 110 of this embodiment. As shown in Figure 5, the first frame 110 is a flow path element for the flow of the first air. The first frame 110 is, for example, a flat resin member formed by injection molding.

[0044] The first frame 110 includes a frame portion 111. The frame portion 111 forms the outer casing of the first frame 110. In plan view, the frame portion 111 has an octagonal shape. On one side (the lower left side in Figure 5), multiple first inlets 112 are formed for the first air to flow into the interior of the first frame 110. On the side opposite to the side where the first inlets 112 are formed (the upper right side in Figure 5), multiple first outlets 113 are formed for the first air to flow out of the first frame 110. The first inlets 112 and first outlets 113 are openings provided in the frame portion 111. On the frame portion 111, sides where the first inlets 112 and first outlets 113 are not formed (more specifically, sides including such sides) are closed to prevent the first air from leaking out of the first frame 110.

[0045] The first frame 110 has a first inlet A1, a first outlet B1, and a first opposing section C1. The first inlet A1 and the first opposing section C1 are connected, and the first opposing section C1 and the first outlet B1 are connected.

[0046] The first inlet A1 includes the first inlet 112. The flow direction of the first air flowing through the first inlet A1 and the flow direction of the second air flowing through the second outlet B2 of the second frame 120 intersect and are perpendicular in this case. The first inlet A1 is located at one end (the left end in Figure 5) and is trapezoidal in plan view.

[0047] The first outlet section B1 includes the first outlet 113. The flow direction of the first air flowing through the first outlet section B1 and the flow direction of the second air flowing through the second inlet section A2 of the second frame 120 intersect and are perpendicular in this case. The first outlet section B1 is located at the other end (the right end in Figure 5) and is trapezoidal in plan view.

[0048] The first opposing section C1 is located between the first inlet section A1 and the first outlet section B1. The direction of the first airflow through the first opposing section C1 and the direction of the second airflow through the second opposing section C2 of the second frame 120 are opposite and in this case, opposite. The first opposing section C1 is located in the center and is rectangular in plan view.

[0049] The first frame 110 further includes a plurality of first ribs 114 and a plurality of reinforcing ribs 115, 116, 117.

[0050] The first rib 114 forms a flow path F through which the first air flows. Multiple first ribs 114 are provided at the first inlet A1, the first outlet B1, and the first opposing section C1, respectively. The multiple first ribs 114 extend substantially parallel to each other. In Figure 5, the first ribs 114 located at the first inlet A1 and the first outlet B1 extend from the lower left to the upper right, while the first ribs 114 located at the first opposing section C1 extend in the left-right direction.

[0051] A first airflow channel F is formed between the frame portion 111 and the first rib 114, and between adjacent first ribs 114. Specifically, multiple channels F are formed by the first ribs 114 provided at the first inlet portion A1, the first opposing portion C1, and the first outlet portion B1, respectively. Each channel F consists of a channel FA at the first inlet portion A1, a channel FC at the first opposing portion C1, and a channel FB at the first outlet portion B1. The channels FA, FC, and FB are connected to each other, but with opposite directions. Specifically, channel FA extends to the upper right. Channel FC extends in the left-right direction. Channel FB extends to the upper right.

[0052] Furthermore, the length of each channel F is approximately the same. Specifically, in Figure 5, the lengths of the multiple channels FA in the first inlet section A1 increase from bottom to top. The lengths of the multiple channels FC in the first opposing section C1 are the same. The lengths of the multiple channels FB in the first outlet section B1 decrease from bottom to top.

[0053] The flow path FA located at the first inlet A1 and the flow path FB located at the first outlet B1 have a straight section and a non-straight section. The flow path FC of the first opposing section C1 consists of a straight section.

[0054] The straight sections extend in a straight line. The straight sections are the parts where the frame 111 and the first rib 114, or two first ribs 114, which constitute the flow path, extend linearly from each other. The straight sections in multiple flow paths FA, FB, and FC are parallel to each other.

[0055] Non-linear sections are formed near the first opposing section C1 in the flow path FA of the first inlet section A1 and the flow path FB of the first outlet section B1. Furthermore, non-linear sections are formed on the first inlet 112 side of the flow path FA located on the upper side of the first inlet section A1, and on the first outlet 113 side of the flow path FB located on the lower side of the first outlet section B1.

[0056] In Figure 5, for the uppermost and lowermost flow paths F, the flow path FA at the first inlet A1 branches at the first opposing section C1 to become two flow paths FC, which then merge at the first outlet section B1 to become one flow path FB. The other flow paths F do not branch and consist of one flow path FA, FB, and FC. Thus, in this embodiment, the flow path FC formed by the frame section 111 and the first rib 114 branches midway, while the flow path FC formed by the first ribs 114 do not branch.

[0057] Multiple flow paths F include a first flow path F1 and a second flow path F2. The first flow path F1 has a straight section of a first length at the first inlet A1. The second flow path F2 has a straight section of a second length that is shorter than the first length at the first inlet A1. At the first inlet A1, the width WA1 of the straight section in the first flow path F1 is greater than the width WA2 of the straight section in the second flow path F2. Here, the width WA1 of the straight section in the first flow path F1 is 1.1 times or more the width WA2 of the straight section in the second flow path F2. There is no particular upper limit, but for example, the width WA1 of the straight section in the first flow path F1 is 2.0 times or less the width WA2 of the straight section in the second flow path F2.

[0058] In the first inlet A1, the first rib 114 forming the first flow path F1 is bent from the first inlet 112 to widen the width of the first flow path F1. Here, the first flow path F1 widens on the first inlet 112 side of the first air. In this embodiment, the two first ribs 114 forming the first flow path F1 are bent to widen from the first inlet 112.

[0059] On the other hand, the first rib 114 that forms the second channel F2 extends straight from the first inlet 112 so as to maintain a constant width for the second channel F2.

[0060] Here, in the first inlet A1, the width W1 of the first air inlet 112 in the first flow path F1 is the same as the width W2 of the first air inlet 112 in the second flow path F2. "The widths of the first inlets 112 are the same" includes cases where the numerical values ​​are exactly the same and cases where the numerical values ​​are considered to be substantially the same. Cases where the numerical values ​​are considered to be substantially the same include, for example, when the width W1 of the first inlet 112 in the first flow path F1 is within the range of 95% to 105% of the width W2 of the first inlet 112 in the second flow path F2.

[0061] Furthermore, the channel height (depth) of the first channel F1 and the second channel F2 are the same. In addition, the opening area (channel height × width) of the first inlet 112 of the first air in the first channel F1 is the same as the opening area of ​​the first inlet 112 of the first air in the second channel F2.

[0062] In this embodiment, the first channel F1 is the second longest in length at the first inlet A1, and the second channel F2 is of medium length at the first inlet A1 (the fifth longest in Figure 5).

[0063] In the first opposing section C1, the length of the straight section of the first flow path FC1 is the same as the length of the straight section of the second flow path FC2. Also, in the first opposing section C1, the width WC1 of the first flow path FC1 is the same as the width WC2 of the second flow path FC2.

[0064] At the first outlet section B1, the length of the straight section of the first channel FB1 is shorter than the length of the straight section of the second channel FB2. Also, at the first outlet section B1, the width WB1 of the straight section of the first channel F1 is the same as the width WB2 of the straight section of the second channel F2.

[0065] Furthermore, in the first flow path F1, the width WC1 of the first opposing section C1 is greater than the width WA1 of the straight section in the first inlet section A1. Also, in the first flow path F1, the width WC1 of the first opposing section C1 is greater than the width WB1 of the straight section in the first outlet section B1.

[0066] Furthermore, in the second flow path F2, the width WC2 of the first opposing section C is greater than the width WA2 of the straight section in the first inlet section A1. Also, in the second flow path F2, the width WC2 of the first opposing section C1 is greater than the width WB2 of the straight section in the first outlet section B1.

[0067] In the first flow path F1, the ratio of the width of the straight section of the first inlet A1 to the width of the first opposing section C1 WC1 (WA1 / WC1) is greater than the ratio of the width of the straight section WA2 of the first inlet A1 to the width WC2 of the first opposing section C1 in the second flow path F2 (WA2 / WC2). Also, the ratio of the width WC of the straight section of the first outlet B1 to the width WC1 of the first opposing section C1 in the first flow path F1 (WB1 / WC1) is the same as the ratio of the width WB2 of the straight section of the first outlet B1 to the width WC2 of the first opposing section C1 in the second flow path FB2 (WB2 / WC2).

[0068] Furthermore, the multiple flow channels F include a third flow channel F3 and a fourth flow channel F4. In the first outlet section B1, the third flow channel F3 has a straight section of a third length. The fourth flow channel F4 has a straight section of a fourth length which is shorter than the third length. In the first outlet section B1, the width WB3 of the straight section in the third flow channel F3 is greater than the width WB4 of the straight section in the fourth flow channel F4. Here, in the first outlet section B1, the width WB3 of the straight section in the third flow channel F3 is 1.1 times or more the width WB4 of the straight section in the fourth flow channel F4.

[0069] In the first outlet section B1, the first rib 114 forming the third flow path F3 is bent from the first outlet 113 toward the first opposing section C1 so as to widen the width of the third flow path F3. Here, the third flow path F3 widens on the first outlet 113 side of the first air. In this embodiment, the two first ribs 114 forming the third flow path F3 are bent so as to widen from the first outlet 113.

[0070] On the other hand, the first rib 114 that forms the fourth channel F4 extends straight from the first outlet 113 to maintain a constant width for the fourth channel F4.

[0071] Here, in the first outlet section B1, the width W3 of the first outlet 113 of the first air in the third flow path F3 is the same as the width W4 of the first outlet 113 of the first air in the fourth flow path F4. "The widths of the first outlets 113 are the same" includes cases where the values ​​are exactly the same and cases where the values ​​are considered to be substantially the same. Cases where the values ​​are considered to be substantially the same include, for example, when the width W3 of the first outlet 113 in the third flow path F3 is within the range of 95% to 105% of the width W4 of the first outlet 113 in the fourth flow path F4.

[0072] Furthermore, the opening area of ​​the first outlet 113 for the first air in the third flow path F3 is the same as the opening area of ​​the first outlet 113 for the first air in the fourth flow path F4.

[0073] In this embodiment, the third channel F3 is the second longest in length at the first outlet B1, and the fourth channel F4 is of medium length at the first outlet B1 (the fifth longest in Figure 5).

[0074] In the first opposing section C1, the length of the straight section of the third flow path FC3 is the same as the length of the straight section of the fourth flow path FC4. Also, in the first opposing section C1, the width WC3 of the third flow path F3 is the same as the width WC4 of the fourth flow path F4.

[0075] Furthermore, in the third flow path F3, the width WC3 of the first opposing section C1 is greater than the width WB3 of the straight section in the first outlet section B1. Also, in the third flow path F3, the width WC3 of the first opposing section C1 is greater than the width WA3 of the straight section in the first inlet section A1.

[0076] In the third flow path F3, the ratio of the width of the straight section of the first outlet B1 to the width of the first opposing section C1 WC3 (WB3 / WC3) is greater than the ratio of the width of the straight section of the first outlet B1 WB4 to the width of the first opposing section C1 WC4 in the fourth flow path F4 (WB4 / WC4).

[0077] The first reinforcing rib 115 is positioned to intersect the first flow path FA1 at the first inlet A1. Specifically, the first reinforcing rib 115 is positioned to intersect a plurality of relatively long flow paths F at the first inlet A1. Here, at the first inlet A1, the first reinforcing rib 115 is positioned perpendicular to the first flow path FA1 and the second flow path FA2. The first reinforcing rib 115 is also connected to the frame portion 111.

[0078] The second reinforcing rib 116 is positioned to intersect the third flow channel FB3 at the first outlet section B1. Specifically, the second reinforcing rib 116 is positioned to intersect a plurality of relatively long flow channels F at the first outlet section B1. Here, at the first outlet section B1, the second reinforcing rib 116 is positioned perpendicular to the third flow channel FB3 and the fourth flow channel FB4.

[0079] The third reinforcing rib 117 is positioned in the first opposing section C1 so as to intersect with the first flow path FC1 and the third flow path FC3. Specifically, the third reinforcing rib 117 is positioned so as to intersect with all of the flow paths F. Here, the three third reinforcing ribs 117 are positioned so as to extend vertically at one end, the other end, and the center of the first opposing section C1.

[0080] The first rib 114 and the reinforcing ribs 115, 116, and 117 intersect. Here, the reinforcing ribs 115, 116, and 117 are arranged perpendicular to the first rib 114. The height of the reinforcing ribs 115, 116, and 117 is lower than the height of the first rib 114, preferably less than or equal to half the height of the first rib 114. Note that multiple first ribs 114 have approximately the same height.

[0081] The first frame 110 further has a fixed portion 118 which is fixed by a fixing member 140. The fixed portion 118 has an opening 119 through which the fixing member 140 passes. The fixed portion 118 is provided on the outer periphery side of the partition membrane 130. In Figure 5, the fixed portion 118 is provided so as to protrude outward from the long side at the long side where the first inlet 112 is not formed at the first inlet A1 and at the long side where the first outlet 113 is not formed at the first outlet B1.

[0082] In the first frame 110, the lowest flow path FL is inclined with respect to the lowest surface of the total heat exchanger 100. Here, "the lowest flow path FL" includes the flow path FC located in the first opposing section C1. In this embodiment, "the lowest flow path FL" is the lowest flow path in the flow path F formed by the frame 111 and the first rib 114. In other words, "the lowest flow path FL" includes the flow path formed by the lowest edge of the frame 111 and the first rib 114. In this embodiment, "downward" refers to downward in the vertical direction.

[0083] The lowest flow path FL is inclined downward toward the first inlet 112 side or the first outlet 113 side of the first air flowing through flow path FL. The inclination angle is not particularly limited, but is, for example, 0.5° or more, and preferably exceeds 1°. The upper limit of the inclination angle is not limited, but is, for example, 5°.

[0084] Here, condensed water is discharged from an opening in the first frame 110. The opening in the first frame 110 is either the first inlet 112 or the first outlet 113. Therefore, the condensed water is discharged from the first inlet 112 or the first outlet 113, which is located lower down. Here, since the first inlet 112 is located lower than the first outlet 113, the condensed water is discharged from the lowest first inlet 112. Thus, in this embodiment, the lowest flow path FL is inclined downward toward the first inlet 112 side (left side in Figure 5) of the first air flowing through the flow path FL.

[0085] Furthermore, at the lowest edge of the first frame 110, the height H1 at one end where condensation water is discharged is smaller than the height H2 at the other end. Specifically, at the lowest edge of the frame 111, the vertical height H1 at one end (the left end in Figure 5) is smaller than the vertical height H2 at the other end (the right end in Figure 5). Here, at the lowest edge of the frame 111, the height gradually decreases from right to left.

[0086] In this embodiment, as described above, the end from which condensation water is discharged is the first inlet 112. Therefore, at the lowest edge of the first frame 110, the height H1 at the end on the first inlet 112 side is smaller than the height H2 at the other end on the first outlet 113 side.

[0087] Furthermore, at the top edge of the first frame, the height H3 at one end is greater than the height H4 at the other end. Specifically, at the top edge of the frame 111, the vertical height H3 at one end (the left end in Figure 5) is greater than the vertical height H4 at the other end (the right end in Figure 5). Here, at the top edge of the frame 111, the height gradually increases from right to left.

[0088] Therefore, the uppermost flow path FH is inclined with respect to the lowest surface of the total heat exchanger 100. In Figure 5, the uppermost flow path FH is inclined upward toward the outlet side of the first air flowing through the flow path.

[0089] Thus, in this embodiment, the uppermost flow path FH and the lowermost flow path FL are inclined with respect to the lowest surface 104 of the total heat exchanger 100, while the other flow paths FC (including the central part in the vertical direction) are parallel to the lowest surface 104 of the total heat exchanger 100. In addition, in the first frame, multiple flow paths FC located below, including the lowest flow path FL, and multiple flow paths FC located above, including the uppermost flow path FH, may be inclined with respect to the lowest surface 104 of the total heat exchanger. In this case, the flow paths FC in the central part in the vertical direction of the first opposing section C1 are parallel to the lowest surface 104 of the total heat exchanger 100.

[0090] Furthermore, at least one of the lowest flow paths FL in the multiple first frames 110 is inclined with respect to the bottom surface 104 of the total heat exchanger 100. The lowest flow paths FL in some of the first frames 110 do not need to be inclined with respect to the bottom surface 104, but it is preferable that the lowest flow paths FL in all of the first frames 110 are inclined with respect to the bottom surface 104.

[0091] (2-2-2) Second frame Figure 6 is a plan view showing the second frame 120 of this embodiment. As shown in Figure 6, the second frame 120 is a flow path element for the flow of second air. The second frame 120 is, for example, a flat resin member formed by injection molding.

[0092] In this embodiment, the first frame 110 and the second frame 120 are point-symmetrical. The second frame 120 has the same shape as the first frame 110, but is arranged with its front and back sides reversed. Specifically, the back side opposite to the front surface of the first frame 110 shown in Figure 5 is the front surface of the second frame 120 shown in Figure 6. Therefore, the configuration of the second frame 120 is the same as that of the first frame 110, and the key points of each part will be explained below.

[0093] The second frame 120 includes a frame portion 121. The frame portion 121 forms the outer casing of the second frame 120. In plan view, the frame portion 121 has an octagonal shape. On one side of this frame (the lower right side in Figure 6), multiple second inlets 122 are formed for the second air to flow into the interior of the second frame 120. On the side opposite to the side where the second inlets 122 are formed (the upper left side in Figure 6), multiple second outlets 123 are formed for the second air to flow out of the second frame 120. The second inlets 122 and second outlets 123 are openings provided in the frame portion 121. On the sides of the frame portion 121 where the second inlets 122 and second outlets 123 are not formed (more specifically, the sides including those sides), the sides are closed to prevent the second air from leaking out of the second frame 120.

[0094] The second frame 120 has a second inlet A2, a second outlet B2, and a second opposing section C2. The second inlet A2 and the second opposing section C2 are connected, and the second opposing section C2 and the second outlet B2 are connected.

[0095] The second entrance section A2 includes the second entrance 122. The second entrance section A2 is located at the other end (the right end in Figure 6) and is trapezoidal in plan view.

[0096] The second exit section B2 includes the second exit 123. The second exit section B2 is located at one end (the left end in Figure 6) and is trapezoidal in plan view.

[0097] The second opposing section C2 is located between the second entrance section A2 and the second exit section B2. The second opposing section C2 is located in the central part and is rectangular in plan view.

[0098] The second frame 120 includes a plurality of second ribs 124 and a plurality of reinforcing ribs 125, 126, 127.

[0099] The second rib 124 forms a passage F through which the second air flows. Multiple second ribs 124 are provided at the second inlet A2, the second outlet B2, and the second opposing section C2, respectively. In Figure 6, the second ribs 124 located at the second inlet A2 and the second outlet B2 extend from the bottom to the upper left, while the second ribs 124 located at the second opposing section C2 extend in the left-right direction.

[0100] A second air passage F is formed between the frame portion 121 and the second rib 124, and between adjacent second ribs 124. Each passage F consists of a passage FA at the second inlet portion A2, a passage FC at the second opposing portion C2, and a passage FB at the second outlet portion B2. The passage FA extends to the upper left, the passage FC extends in the left-right direction, and the passage FB extends to the upper left.

[0101] The flow path FA located at the second inlet A2 and the flow path FB located at the second outlet B2 have a straight section and a non-straight section. The flow path FC of the second opposing section C2 consists of a straight section.

[0102] Multiple flow paths F each have a first flow path F1 having a straight section of a first length, and a second flow path F2 having a straight section of a second length shorter than the first length. At the second inlet A2, the width WA1 of the straight section in the first flow path F1 is greater than the width WA2 of the straight section in the second flow path F2.

[0103] At the second inlet A2, the second rib 124 forming the first flow path F1 is bent from the second inlet 122 to widen the width of the first flow path F1. On the other hand, the second rib 124 forming the second flow path F2 extends straight from the second inlet 122 to maintain a constant width for the second flow path F2.

[0104] Here, in the second inlet A2, the width W1 of the second air inlet 122 in the first flow path F1 is the same as the width W2 of the second air inlet 122 in the second flow path F2. "The widths of the second inlets 122 are the same" includes cases where the values ​​are exactly the same and cases where the values ​​are considered to be substantially the same. Cases where the values ​​are considered to be substantially the same include, for example, when the width W1 of the second inlet 122 in the first flow path F1 is within the range of 95% to 105% of the width W2 of the second inlet 122 in the second flow path F2.

[0105] The ratio of the width of the straight section of the second inlet A2 to the width WC1 of the second opposing section C2 in the first flow path F1 (WA1 / WC1) is greater than the ratio of the width WA2 of the straight section of the second inlet A2 to the width WC2 of the second opposing section C2 in the second flow path F2 (WA2 / WC2).

[0106] Furthermore, the multiple flow channels F include a third flow channel F3 having a straight section of a third length, and a fourth flow channel F4 having a straight section of a fourth length shorter than the third length. At the second outlet section B2, the width WB3 of the straight section in the third flow channel F3 is greater than the width WB4 of the straight section in the fourth flow channel F4.

[0107] At the second outlet section B2, the second rib 124 forming the third flow path F3 is bent from the second outlet 123 toward the second opposing section C2 to widen the width of the third flow path F3. On the other hand, the second rib 124 forming the fourth flow path F4 extends straight from the second outlet 123 to maintain a constant width for the fourth flow path F4.

[0108] Here, in the second outlet section B2, the width W3 of the second outlet 123 of the first air in the third flow path F3 is the same as the width W4 of the second outlet 123 of the second air in the fourth flow path F4. "The widths of the second outlets 123 are the same" includes cases where the values ​​are exactly the same and cases where the values ​​are considered to be substantially the same. Cases where the values ​​are considered to be substantially the same include, for example, when the width W3 of the second outlet 123 of the third flow path F3 is within the range of 95% to 105% of the width W4 of the second outlet 123 of the fourth flow path F4.

[0109] In the third flow path F3, the ratio of the width of the straight section of the second outlet B2 to the width of the second opposing section C2 WC3 (WB3 / WC3) is greater than the ratio of the width of the straight section of the second outlet B2 WB4 to the width of the second opposing section C2 WC4 in the fourth flow path F4 (WB4 / WC4).

[0110] The first reinforcing rib 125 is positioned to intersect the first flow path FA1 at the second inlet A2. The second reinforcing rib 126 is positioned to intersect the third flow path FB3 at the second outlet B2. The third reinforcing rib 127 is positioned to intersect the first flow path FC1 and the third flow path FC3 at the second opposing section C2.

[0111] The second rib 124 intersects with the reinforcing ribs 125, 126, and 127. The heights of the reinforcing ribs 125, 126, and 127 are lower than the height of the second rib 124. Multiple second ribs 124 have approximately the same height.

[0112] The second frame 120 further has a fixed portion 128 which is fixed by a fixing member 140. The fixed portion 128 has an opening 129 through which the fixing member 140 passes. The fixed portion 128 is provided on the outer periphery side of the partition membrane 130. In Figure 6, the fixed portion 128 is provided so as to protrude outward from the long side at the long side where the second inlet 122 is not formed in the second inlet A2 and at the long side where the second outlet 123 is not formed in the second outlet B2.

[0113] In the second frame 120, the lowest flow path FL is inclined with respect to the lowest surface of the total heat exchanger 100. Here, "the lowest flow path FL" includes the flow path FC located in the second opposing section C2. In this embodiment, "the lowest flow path FL" is the lowest flow path in the flow path F formed by the frame 121 and the second rib 124. In other words, "the lowest flow path FL" includes the flow path formed by the lowest edge of the frame 121 and the second rib 124. In this embodiment, "downward" refers to downward in the vertical direction.

[0114] The lowest flow path FL is inclined downward toward the second inlet 122 side or the second outlet 123 side of the second air flowing through flow path FL. The inclination angle is not particularly limited, but is, for example, 0.5° or more, and preferably exceeds 1°. The upper limit of the inclination angle is not limited, but is, for example, 5°.

[0115] Here, the condensed water is discharged from the second inlet 122 or the second outlet 123, which are openings in the second frame 120. Therefore, the condensed water is discharged from the second inlet 122 or the second outlet 123, which are located lower down. Here, since the second inlet 122 is located lower than the second outlet 123, the condensed water is discharged from the second inlet 122, which is the lowest point. Thus, in this embodiment, the lowest point of the flow path FL is inclined downward toward the second inlet 122 side (right side in Figure 6) of the second air flowing through the flow path FL.

[0116] Furthermore, at the bottom edge of the second frame 120, the height H4 at one end where condensation water is discharged is smaller than the height H3 at the other end. Specifically, at the bottom edge located at the lowest point of the frame 121, the vertical height H4 at one end (the right end in Figure 6) is smaller than the vertical height H3 at the other end (the left end in Figure 6). Here, at the bottom edge located at the lowest point of the frame 121, the height gradually decreases from left to right.

[0117] In this embodiment, as described above, the end from which condensation water is discharged is the second inlet 122. Therefore, at the lowest edge of the second frame 120, the height H4 at the end on the second inlet 122 side is smaller than the height H3 at the other end on the second outlet 123 side.

[0118] Furthermore, at the top edge of the second frame 120, the height H2 at one end is greater than the height H1 at the other end. Specifically, at the top edge of the frame 121, the vertical height H2 at one end (the right end in Figure 6) is greater than the vertical height H1 at the other end (the left end in Figure 6). Here, at the top edge of the frame 121, the height gradually increases from left to right.

[0119] Therefore, the uppermost flow path FH is inclined with respect to the lowest surface 104 of the total heat exchanger 100. In Figure 6, the uppermost flow path FH is inclined upward toward the second outlet 123 side of the second air flowing through the flow path FH.

[0120] Thus, in this embodiment, the uppermost flow path FH and the lowermost flow path FL are inclined with respect to the lowest surface 104 of the total heat exchanger 100, while the other flow paths FC (including the central part in the vertical direction) are parallel to the lowest surface 104 of the total heat exchanger 100. In addition, in the second frame 120, multiple flow paths FC located below, including the lowest flow path FL, and multiple flow paths FC located above, including the uppermost flow path FH, may be inclined with respect to the lowest surface 104 of the total heat exchanger. In this case, the flow paths FC in the central part in the vertical direction of the second opposing section C2 are parallel to the lowest surface 104 of the total heat exchanger 100.

[0121] Furthermore, at least one of the lowest flow paths FL in the multiple second frames 120 is inclined with respect to the bottom surface 104 of the total heat exchanger 100. The lowest flow paths FL in some of the second frames 120 do not need to be inclined with respect to the bottom surface 104, but it is preferable that the lowest flow paths FL in all of the second frames 120 are inclined with respect to the bottom surface 104.

[0122] Furthermore, in the first frame 110 and the second frame 120, which are adjacent to each other with the partition membrane 130 in between, the lowest flow path FL is inclined in opposite directions with respect to the lowest surface 104 of the total heat exchanger 100. Here, the lowest flow path FL of the first frame 110 shown in Figure 5 is inclined downward from right to left, and the lowest flow path FL of the second frame 120 shown in Figure 6 is inclined downward from left to right.

[0123] The total heat exchanger 100 may also be further equipped with a drain pan (not shown) for receiving the discharged condensation water.

[0124] (2-2-3) Partition membrane As shown in Figure 4, the partition membrane 130 is provided between the first frame 110 and the second frame 120. The partition membrane 130 separates the flow path F through which the first air flows from the flow path F through which the second air flows. The partition membrane 130 is a sheet-like member that covers the entire flow path F of the first frame 110 and the second frame 120.

[0125] The partition membrane 130 is permeable to moisture. The partition membrane 130 in this embodiment allows sensible heat to transfer while simultaneously allowing moisture to pass through.

[0126] In this embodiment, as shown in Figure 7, the partition membrane 130 includes a porous substrate 131 and a moisture-permeable layer 132. The moisture-permeable layer 132 is provided in contact with the porous substrate 131. The moisture-permeable layer 132 is welded to the first frame 110 and the second frame 120. Therefore, the partition membrane 130 is directly joined to the first frame 110 and the second frame 120 without the use of adhesive. In other words, there is no adhesive between the first frame 110 and the second frame 120.

[0127] The porous substrate 131 is a porous sheet-like member. Here, the porous substrate 131 is a resin sheet. The porous substrate 131 is composed of, for example, a polyolefin resin or a nonwoven fabric made of fibrous resin. The porous substrate 131 preferably has high moisture permeability. The thickness of the porous substrate 131 is not particularly limited, but is, for example, 1 μm or more and 30 μm or less.

[0128] The porous substrate 131 has a first surface 131a and a second surface 131b. The second surface 131b is located on the opposite side from the first surface 131a. The first surface 131a is treated, for example, with a hydrophilic treatment.

[0129] The moisture-permeable layer 132 is a coating that covers the entire first surface 131a of the porous substrate 131. The thickness of the moisture-permeable layer 132 is not particularly limited, but is, for example, 0.05 μm or more and 1 μm or less. The moisture-permeable layer 132 is composed of, for example, a moisture-permeable polymer.

[0130] (2-2-4) Fixing Members Figure 8 shows the state in Figure 3 with the side plate 103 omitted and the guide portion of the fixing member 140 not removed. Figure 9 shows the state in Figure 8 with the top plate 101 omitted. Figure 10 shows an enlarged view of one fixing member 140 near the top plate 101 in Figure 8. Figure 10 shows an enlarged view of one fixing member 140 near the bottom plate 102 in Figures 8 and 9.

[0131] As shown in Figures 8 and 9, the fixing member 140 holds the first frame 110 and the second frame 120 under pressure in the stacking direction. Here, the fixing member 140 has a holding mechanism that holds multiple first frames 110, multiple second frames 120, and multiple partition membranes 130 under pressure in the stacking direction. The fixing member 140 is a rod-shaped member that extends in the stacking direction (front-to-back direction in Figures 8 and 9) of the first frame 110 and the second frame 120.

[0132] The fixing member 140 fixes the first frame 110 and the second frame 120 by being inserted into at least one of the fixed portion 118 of the first frame 110 and the fixed portion 128 of the second frame 120. The fixing member 140 does not have to be in contact with the fixed portions 118 and 128, but it may be in contact with a part of the fixed portions 118 and 128.

[0133] The fixed portion 118 of the first frame 110 and the fixed portion 128 of the second frame 120 are provided in the total heat exchanger 100 on at least one of the side portions including the first inlet 112 of the first air, the first outlet 113 of the first air, the second inlet 122 of the second air, and the second outlet 123 of the second air. Therefore, the fixing member 140 is provided in the total heat exchanger 100 on at least one of the side portions including the first inlet 112 of the first air, the first outlet 113 of the first air, the second inlet 122 of the second air, and the second outlet 123 of the second air.

[0134] Here, the fixed parts 118 and 128 are provided on the side portion including the first inlet 112 of the first air, the side portion including the first outlet 113 of the first air, the side portion including the second inlet 122 of the second air, and the side portion including the second outlet 123 of the second air. More specifically, the fixed part 118 of the first frame 110 is provided on the side portion including the second inlet 122 of the second air and the side portion including the second outlet 123 of the second air in the total heat exchanger 100. The fixed part 128 of the second frame 120 is provided on the side portion including the first inlet 112 of the first air and the side portion including the first outlet 113 of the first air in the total heat exchanger 100. For this reason, the fixing member 140 is provided on the side portion including the first inlet 112 of the first air, the side portion including the first outlet 113 of the first air, the side portion including the second inlet 122 of the second air, and the side portion including the second outlet 123 of the second air.

[0135] In this embodiment, the openings 119, 129 of the multiple fixed parts 118, 128 are arranged in a row in the front-to-back direction. The fixing members 140 are inserted through the openings 119, 129 in each row. In Figures 8 and 9, three fixing members 140 are provided on one side surface. Since fixing members 140 are provided on four side surfaces, the total heat exchanger 100 has 12 fixing members 140.

[0136] As shown in Figure 4, the fixing member 140 is located on the outer periphery of the partition membrane 130. Therefore, the fixing member 140 is not inserted into the partition membrane 130. In other words, the partition membrane 130 does not have a hole for the fixing member 140 to pass through.

[0137] As shown in Figures 8 and 9, the fixing member 140 has an opening 141 with respect to at least one of the flow directions of the first air and the second air. Here, the fixing member 140 provided on the side portion including the first inlet 112 of the first air, and the fixing member 140 provided on the side portion including the first outlet 113 of the first air, have an opening 141 with respect to the flow direction of the first air. The fixing member 140 provided on the side portion including the second inlet 122 of the second air, and the fixing member 140 provided on the side portion including the second outlet 123 of the second air, have an opening 141 with respect to the flow direction of the second air.

[0138] One end of the fixing member 140 is fixed to the top plate 101, and the other end is fixed to the bottom plate 102. The top plate 101 and the bottom plate 102 are made of, for example, resin.

[0139] More specifically, as shown in Figure 10, one end of the fixing member 140 has an engaging claw 142 provided at one end in the stacking direction. This engaging claw 142 is fitted into the opening of the top plate 101. Also, as shown in Figure 11, the other end of the fixing member 140 has an engaging claw 143 provided at the other end in the stacking direction. This engaging claw 143 is fitted into the opening of the bottom plate 102. The engaging claws 142 and 143 are made of an elastic material, and here, the engaging claws 142 and 143 are snap-fit.

[0140] The distance between the two engaging claws 142 and 143 is less than the self-weight thickness of the first frame 110, the second frame 120, and the partition membrane 130 positioned between them. Therefore, the fixing member 140 can hold the first frame 110, the second frame 120, and the partition membrane 130 positioned between them under pressure. In this case, the fixing member 140 holds the first frame 110 and the second frame 120 under a pressure of 10 kPa or more.

[0141] In Figures 8 to 10, the fixing member 140 has a guide portion 144, but the guide portion 144 is removed during the manufacturing process.

[0142] (2-3) Manufacturing method A method for manufacturing the total heat exchanger 100 will be described.

[0143] The first frame 110 is placed on the base plate 102. Next, partition films 130 are attached to the first frame 110 and the second frame 120, and the two frames are stacked alternately to form a laminate on the base plate 102 as shown in Figure 9.

[0144] Next, a fixing member 140 having a guide portion 144 is prepared. This fixing member 140 is passed through the fixed portion 118 of the first frame 110 and the fixed portion 128 of the second frame 120, respectively. At this time, as shown in Figure 11, the engaging claws 143 of the fixing member 140 are fitted into the opening of the bottom plate 102 to fix the bottom plate 102 and the laminate to the fixing member 140.

[0145] Next, as shown in Figure 8, the guide portion 144 of the fixing member 140 is used to fit the engaging claw 142 of the fixing member 140 into the opening of the top plate 101, thereby fixing the fixing member 140 and the top plate 101. After that, the guide portion 144 is removed. The guide portion 144 is connected to the main body by perforations or the like, and is configured to be easily removed.

[0146] Next, the side plates 103 are attached to the laminate. This allows the total heat exchanger 100 shown in Figure 3 to be manufactured.

[0147] (2-4) Operation As shown in Figure 1, in the total heat exchanger 100, outdoor air OA flows into the first inlet 112 and indoor air RA flows into the second inlet 122. The outdoor air OA that flows into the first inlet 112 flows through the supply air side passage 25, passes through the first inlet A1, the first opposing section C1 and the first outlet B1 (see Figure 5) in order, and flows out from the first outlet 113 to be supplied to the room as supply air SA. The indoor air RA that flows into the second inlet 122 passes through the second inlet A2, the second opposing section C2 and the second outlet B2 (see Figure 6) in order, and flows out from the second outlet 123 to be discharged to the outside as exhaust air EA.

[0148] At the first inlet A1 and second outlet B2 of the total heat exchanger 100, and at the first outlet B1 and second inlet A2, the outdoor air as the first air and the indoor air as the second air flow in directions that intersect each other. At the first opposing section C1 and second opposing section C2 of the total heat exchanger 100, the outdoor air as the first air and the indoor air as the second air flow in opposite directions.

[0149] In the total heat exchanger 100, sensible heat and latent heat (moisture) are exchanged between the first air and the second air. In the total heat exchanger 100, heat moves from the air with a higher temperature to the air with a lower temperature. Also, in the total heat exchanger 100, moisture moves from the air with a higher humidity to the air with a lower humidity.

[0150] In this way, the total heat exchanger 100 exchanges heat between the outdoor air supplied to the room as the first air and the indoor air discharged from the room as the second air.

[0151] As the first air and the second air exchange heat in this manner, condensation water is generated on the first frame 110 and the second frame 120. The condensation water falls downward from each flow path F and moves to the flow path FL located at the lowest point. The flow path FL, located at the lowest point to which the condensation water has moved, is inclined with respect to the lowest surface 104 of the total heat exchanger 100, which is parallel to the surface on which the total heat exchanger 100 is installed. Therefore, the condensation water moves along the inclination and is discharged from at least one of the openings of the first frame 110, namely the first inlet 112 and the first outlet 113, and the openings of the second frame 120, namely the second inlet 122 and the second outlet 123 (in this case, at least one of the first inlet 112 and the second inlet 122). This promotes the discharge of condensation water from the first frame 110 and the second frame 120.

[0152] (3) Features (3-1) The total heat exchanger 100 according to this embodiment comprises a first frame 110, a second frame 120, and a partition membrane 130. The first frame 110 includes a first rib 114. The first rib 114 forms a plurality of flow paths F through which the first air flows. The second frame 120 includes a second rib 124. The second rib 124 forms a plurality of flow paths F through which the second air flows. The partition membrane 130 separates the first frame 110 and the second frame 120. The first frame 110 has a first inlet A1 (the "inlet" in the claim), a first outlet B1 (the "outlet" in the claim), and a first opposing part C1 (the "opposing part" in the claim). The first inlet A1 includes a first inlet 112 (the "inlet" in the claim) for the first air, through which the first air flows intersecting with the second air. The first outlet section B1 includes the first outlet 113 (the "outlet" in the claim) for the first air, through which the first air flows intersecting with the second air. The first opposing section C1 is located between the first inlet section A1 and the first outlet section B1, through which the first air flows opposite the second air.

[0153] At the first inlet A1, the flow path F has a first flow path F1 (first flow path FA1 in this embodiment) and a second flow path F2 (second flow path FA2 in this embodiment), and / or, at the first outlet B1, the flow path F has a third flow path F3 (the "first flow path" in the claim, the third flow path FB3 in this embodiment) and a fourth flow path F4 (the "second flow path" in the claim, the fourth flow path FB4 in this embodiment). The first flow path F1 (first flow path FA1 in this embodiment) and the third flow path F3 (third flow path FB3 in this embodiment) have a straight section of a first length. The second flow path F2 (second flow path FA2 in this embodiment) and the fourth flow path F4 (fourth flow path FB4 in this embodiment) have a straight section shorter than the first length. The width WA1 of the straight section in the first flow path F1 is greater than the width WA2 of the straight section in the second flow path F2, and / or, the width WB3 of the straight section in the third flow path F3 is greater than the width WB4 of the straight section in the fourth flow path F4.

[0154] Flow channels with long straight sections have high airflow resistance. Therefore, in the total heat exchanger 100 of this embodiment, the width WA1 of the first flow channel FA1 and the width WB3 of the third flow channel FB3, which have long straight sections, are made larger than the width WA2 of the second flow channel FA2 and the width WB4 of the fourth flow channel FB4, which have short straight sections. Thus, in this embodiment, there are relatively long flow channels and relatively short flow channels, and the width of the relatively long flow channels is made larger than the width of the relatively short flow channels. This makes it possible to reduce the airflow resistance of at least one of the long flow channels, the first flow channel F1 and the third flow channel F3. Consequently, the airflow resistance of the total heat exchanger 100 can be reduced.

[0155] Furthermore, it is preferable that the first channel F1, second channel F2, third channel F3, and fourth channel F4 do not include channels composed of the frame portion 111 and the first rib 114. In other words, it is preferable that the first channel F1, second channel F2, third channel F3, and fourth channel F4 exclude the lowest channel FL and the highest channel FH.

[0156] Furthermore, it is preferable that the first channel F1 and the third channel F3 are channels with long channel lengths, and the second channel F2 and the fourth channel F4 have channel lengths that are slightly longer than the middle. Here, it is preferable that the first channel F1 is a channel located above, and the second channel F2 is a channel located above the center. It is preferable that the third channel F3 is a channel located below, and the fourth channel F4 is a channel located below the center.

[0157] (3-2) In the total heat exchanger 100 according to this embodiment, the first rib 114 is bent to widen the width of the first flow path F1 from the first inlet 112 of the first air, and / or the first rib 114 is bent to widen the width of the third flow path F3 from the first outlet 113 of the first air.

[0158] Here, the first rib 114 is bent to adjust the width of at least one of the first channel F1 and the third channel F3. As a result, the airflow resistance of at least one of the first channel F1 and the third channel F3 can be reduced.

[0159] (3-3) In the total heat exchanger 100 according to this embodiment, the first flow path F1 widens on the side of the first inlet 112 of the first air, and / or the third flow path F3 widens on the side of the first outlet 113 of the first air.

[0160] Here, by widening the width of at least one side of the first inlet 112 of the first flow path F1 and the first outlet 113 of the third flow path F3, the airflow resistance of the first flow path F1 can be more effectively reduced.

[0161] (3-4) In the total heat exchanger 100 according to this embodiment, the width W1 of the first inlet 112 of the first air in the first flow path F1 is the same as the width W2 of the first inlet 112 of the first air in the second flow path F2, and / or the width W3 of the outlet of the first air in the third flow path F3 is the same as the width W4 of the first outlet 113 of the first air in the fourth flow path F4.

[0162] Here, the widths WA1 and WA2, and WB3 and WB4 of the straight sections are compared under the same conditions for the first inlet 112 in the first flow path F1 and the second flow path F2, and / or under the same conditions for the first outlet 113 in the third flow path F3 and the fourth flow path F4. As a result, a total heat exchanger 100 with low airflow resistance can be easily realized.

[0163] (3-5) In the total heat exchanger 100 according to this embodiment, the first frame 110 further includes a reinforcing rib 115 arranged to intersect the first flow path F1, and / or a reinforcing rib 116 arranged to intersect the third flow path F3.

[0164] Here, since at least one of the reinforcing rib 115 of the first inlet A1 and the reinforcing rib 116 of the first outlet B1 is provided, the strength of the first rib 114 that forms the first flow path F1 and the third flow path F3, which have been widened due to their longer initial length, can be reinforced.

[0165] Furthermore, it is preferable that the first channel F1 and the second channel F2 are channels reinforced with reinforcing ribs 115. It is preferable that the third channel F3 and the fourth channel F4 are channels reinforced with reinforcing ribs 116.

[0166] (3-6) In the total heat exchanger 100 according to this embodiment, the width WA1 of the straight section in the first flow path F1 is 1.1 times or more the width WA2 of the straight section in the second flow path F2, and / or the width WA3 of the straight section in the third flow path F3 is 1.1 times or more the width WA4 of the straight section in the fourth flow path F4.

[0167] By making the width WA1 of the straight section in the first channel F1 at least 1.1 times the width of the straight section in the second channel F2, the airflow resistance of the first channel F1 can be further reduced. By making the width WA3 of the straight section in the third channel F3 at least 1.1 times the width of the straight section in the fourth channel F4, the airflow resistance of the third channel F3 can be further reduced.

[0168] (3-7) In the total heat exchanger 100 according to this embodiment, the ratio of the width WA1 of the straight section FC1 to the width FC1 of the first opposing section C1 in the first flow path F1 (WA1 / WC1) is greater than the ratio of the width WA2 of the straight section WC2 to the width WC2 of the first opposing section C1 in the second flow path F2 (WA2 / WC2).

[0169] Alternatively, or in conjunction with the above, the ratio of the width WB3 of the straight section of the first opposing section C1 in the third flow path F3 to the width FC3 (WB3 / WC3) is greater than the ratio of the width WB4 of the straight section of the first opposing section C4 in the fourth flow path F4 to the width WC4 (WB4 / WC4).

[0170] In the total heat exchanger of this disclosure, the width WA1 of the first flow path F1 (width WB3 of the third flow path F3), which has a longer flow path length, is made larger than the width WA2 of the second flow path F2 (width WB4 of the fourth flow path F4), which has a shorter flow path length. For this reason, as in the total heat exchanger 100 of this embodiment, the ratio of the width of the straight section WA1 to the width WC1 of the first opposing section C1 in the first flow path F1 (width WA1 of the straight section / width WC1 of the opposing section) may be made larger than the ratio of the width WA2 of the straight section to the width WC2 of the first opposing section C1 in the second flow path F2 (width WA2 of the straight section / width WC2 of the opposing section). Also, the ratio of the width of the straight section WB3 to the width WC3 of the first opposing section C3 in the third flow path F3 (width WB3 of the straight section / width WC3 of the opposing section) may be made larger than the ratio of the width WB4 of the straight section to the width WC4 of the first opposing section C4 in the fourth flow path F4 (width WB4 of the straight section / width WC4 of the opposing section).

[0171] (3-8) In the total heat exchanger 100 according to this embodiment, the width WC1 of the first opposing section C1 in the first flow path F1 is greater than the width WA1 of the straight section.

[0172] Alternatively, or in conjunction with the above, in the third flow path F3, the width WC3 of the first opposing section C1 is greater than the width WB3 of the straight section.

[0173] As in the total heat exchanger 100 of this embodiment, the width WC1 of the first opposing portion C1 of the first flow path F1 may be made larger than the width WA1 of the straight portion of the first flow path F1. Also, the width WC3 of the first opposing portion C3 of the third flow path F3 may be made larger than the width WB3 of the straight portion of the third flow path F3.

[0174] (3-9) The ventilation system 1 according to this embodiment includes the total heat exchanger 100. In the total heat exchanger 100, the supply air supplied from outside to inside as first air and the exhaust air discharged from inside to outside as second air are subjected to heat exchange.

[0175] Since the ventilation device 1 of this embodiment is equipped with the total heat exchanger 100 described above, the ventilation resistance can be reduced.

[0176] (4) Variations (4-1) Experiment 1 In the above embodiment, the first frame 110 and the second frame 120 are members of the same shape, but the embodiment is not limited to this and may have different shapes.

[0177] (4-2) Modification 2 In the above embodiment, the partition membrane 130 includes, but is not limited to, a resin sheet. The partition membrane 130 may be made of, for example, paper. In this case, the partition membrane 130 is a single layer.

[0178] (4-3) Modification 3 In the above embodiment, the first frame 110 and the second frame 120 have an octagonal shape in plan view, but are not limited thereto. The first frame 110 and the second frame 120 may have shapes such as a hexagon or a quadrilateral in plan view.

[0179] (4-4) Modification 4 In the above embodiment, the bottom surface 104 of the total heat exchanger 100 is formed by the bottom plate 102, but is not limited to this. The bottom surface 104 of the total heat exchanger 100 may be the bottom surface of at least one of the first frame 110 and the second frame 120, a surface defined by a plurality of legs, etc. The legs are members that support the total heat exchanger 100.

[0180] (4-5) Modification 5 In the above embodiment, the flow path FH located at the uppermost part of the first frame 110 and the second frame 120 is inclined with respect to the lowest surface 104 of the total heat exchanger 100, but is not limited to this, and may be parallel to the lowest surface 104.

[0181] (4-6) Modification 6 In the above embodiment, a rod-shaped fixing member 140 with engaging claws was described as an example, but it is not limited to this. The fixing member 140 may be composed of, for example, a bolt and a nut.

[0182] (4-7) Modification 7 In the above embodiment, the fixing member 140 does not penetrate the partition membrane 130, but is not limited to this. The partition membrane 130 may have an opening, and the fixing member 140 may be positioned to pass through the opening in the partition membrane 130.

[0183] (4-8) Modification 8 In the above embodiment, the first frame 110 and the second frame 120 are welded to the partition membrane 130, but the embodiment is not limited to this. The first frame 110 and the second frame 120 may be joined to the partition membrane 130 with an adhesive or the like.

[0184] While embodiments of this disclosure have been described above, it should be understood that various modifications to the form and details are possible without departing from the spirit and scope of this disclosure as described in the claims. [Explanation of Symbols]

[0185] 1: Ventilation system 100: Total heat exchanger 110: First frame 112: First entry point (Entry point of the claim) 113: First exit (exit of the claim) 114: First Rib 115: Reinforcement Rib 120: 2nd frame 122: Entrance 2 123:Second exit 124: Second Rib 125: Reinforcement Rib 130: Partition membrane A1: First entrance portion (the entrance portion of the claim) A2: 2nd entrance section B1: First exit section (exit section of the claim) B2: 2nd exit section C1: First opposing part (opposing part of the claim) C2: 2nd opposing part F, FA, FB, FC: Flow path F1, FA1, FB1, FC1: First channel F2, FA2, FB2, FC2: Second channel F3, FA3, FB3, FC3: Third channel (first channel as defined in the claim) F4, FA4, FB4, FC4: Fourth channel (Second channel of the claim) [Prior art documents] [Patent Documents]

[0186] [Patent Document 1] Japanese Patent Publication No. 2008-70070

Claims

1. A first frame (110) including a first rib (114) that forms multiple flow channels (F) through which the first air flows, A second frame (120) including a second rib (124) that forms multiple airflow channels (F) through which the second air flows, A partition membrane (130) separates the first frame and the second frame, Equipped with, The first frame mentioned above is, The inlet portion (A1) includes the first air inlet (112) through which the first air flows intersecting with the second air, The outlet section (B1) includes the outlet (113) of the first air, where the first air flows intersecting with the second air, A counter section (C1) is located between the inlet and outlet sections, and the first air flows opposite the second air, It has, In at least one of the inlet and outlet portions, the flow path is A first flow channel (FA1) having a straight section of a first length, A second flow path (FA2) having a straight section shorter than the first length, It has, A total heat exchanger (100) wherein the width of the straight section (WA1) in the first flow path is greater than the width of the straight section (WA2) in the second flow path.

2. The first rib is bent from at least one of the first air inlet and outlet to widen the width of the first air passage. The total heat exchanger according to claim 1.

3. The first flow path widens at least on one side of the inlet and outlet of the first air. The total heat exchanger according to claim 2.

4. The width (W1) of the first air inlet in the first flow path is the same as the width (W2) of the first air inlet in the second flow path. and / or, The width (W3) of the outlet of the first air in the first flow path is the same as the width (W4) of the outlet of the first air in the second flow path. A total heat exchanger according to any one of claims 1 to 3.

5. The first frame further includes reinforcing ribs (115) arranged to intersect the first flow path. A total heat exchanger according to any one of claims 1 to 3.

6. The width of the straight section in the first channel is 1.1 times or more the width of the straight section in the second channel. A total heat exchanger according to any one of claims 1 to 3.

7. The ratio of the width of the straight section (WA1 / WC1) to the width of the opposing section (WC1) in the first flow path is greater than the ratio of the width of the straight section (WA2 / WC2) to the width of the opposing section (WC2) in the second flow path. A total heat exchanger according to any one of claims 1 to 3.

8. In the first flow path, the width of the opposing portion is greater than the width of the straight portion. A total heat exchanger according to any one of claims 1 to 3.

9. A total heat exchanger according to any one of claims 1 to 3, A ventilation device (1) in the total heat exchanger that exchanges heat between supply air supplied from outside to inside as the first air and exhaust air discharged from inside to outside as the second air.

Images