US-20260126206-A1 - HEAT EXCHANGER, VENTILATOR, AND METHOD FOR MANUFACTURING HEAT EXCHANGER

US20260126206A1US 20260126206 A1US20260126206 A1US 20260126206A1US-20260126206-A1

Abstract

A method for manufacturing a heat exchanger includes a first step of assembling a plurality of flow pass elements and a second step of stacking the plurality of flow pass elements assembled in the first step. Each flow pass element is assembled by joining a partition member to a frame forming an air flow path. The partition member is a moisture permeable sheet shaped member. Each partition member includes a porous base that is sheet shaped and a moisture permeable layer covering a surface of the porous base. Each flow pass element is assembled by stacking the partition member on the frame such that the moisture permeable layer faces the frame. A portion of the moisture permeable layer facing the frame is temporally dissolved or softened. The portion of the moisture permeable layer which has been temporally dissolved or softened is solidified to join the partition member to the frame.

Inventors

Takema NAKAZAWA
Masaya Kasai

Assignees

DAIKIN INDUSTRIES, LTD.

Dates

Publication Date: 20260507
Application Date: 20251229
Priority Date: 20211227

Claims (2)

1 . A method for manufacturing a heat exchanger, the method comprising: a first step of assembling a plurality of flow pass elements, each flow pass element being assembled by joining a partition member to a frame forming an air flow path, the partition member being a moisture permeable sheet shaped member; and a second step of stacking the plurality of flow pass elements assembled in the first step, each partition member including a porous base that is sheet shaped and a moisture permeable layer covering a surface of the porous base, and each flow pass element being assembled by stacking the partition member on the frame such that the moisture permeable layer faces the frame, temporally dissolving or softening a portion of the moisture permeable layer facing the frame, and solidifying the portion of the moisture permeable layer which has been temporally dissolved or softened, to join the partition member to the frame.
2 . The method of claim 1 , wherein the moisture permeable layer of the partition member is formed by applying a raw material liquid to the porous base, the raw material liquid is a mixture of a first substance forming the moisture permeable layer and a solvent containing a second substance as a main component, the first step includes causing a treatment liquid containing the second substance as a main component to adhere to the frame, and stacking the moisture permeable layer of the partition member to a surface of the frame on which the treatment liquid has been adhered, and temporally dissolving a portion of the moisture permeable layer facing the frame.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a divisional application of U.S. patent application Ser. No. 18/748,866, filed on Jun. 20, 2024, which is a continuation of International Application No. PCT/JP2022/047887 filed on Dec. 26, 2022, which claims priority to Japanese Patent Application No. 2021-212114, filed on Dec. 27, 2021. The entire disclosures of these applications are incorporated by reference herein. BACKGROUND Technical Field The present disclosure relates to a heat exchanger, a ventilator, and a method for manufacturing the heat exchanger. Background Art Japanese Unexamined Patent Publication No. H7-208891 discloses a heat exchanger configured to exchange heat between two different kinds of air. In this heat exchanger, an interval between partition plates stacked is maintained by separation plates. The partition plates and the separation plates are adhered to each other with an adhesive. SUMMARY A method for manufacturing a heat exchanger includes a first step of assembling a plurality of flow pass elements and a second step of stacking the plurality of flow pass elements assembled in the first step. Each flow pass element is assembled by joining a partition member to a frame forming an air flow path. The partition member is a moisture permeable sheet shaped member. Each partition member includes a porous base that is sheet shaped and a moisture permeable layer covering a surface of the porous base. Each flow pass element is assembled by stacking the partition member on the frame such that the moisture permeable layer faces the frame. A portion of the moisture permeable layer facing the frame is temporally dissolved or softened. The portion of the moisture permeable layer which has been temporally dissolved or softened is solidified to join the partition member to the frame. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram illustrating a ventilator. FIG. 2 is a perspective view of a heat exchanger. FIG. 3 is a plan view of the heat exchanger. FIG. 4 is a plan view of a first frame according to the heat exchanger. FIG. 5 is a plan view of a second frame of the heat exchanger. FIG. 6 is a cross-sectional view of portion of the heat exchanger taken along line VI-VI in FIG. 3. FIG. 7 is a cross-sectional view corresponding to FIG. 6 with first elements and second elements separated from each other. FIG. 8 is a cross-sectional view of a partition sheet of the heat exchanger. FIG. 9 is a flowchart of a method for manufacturing a heat exchanger. FIG. 10A, FIG. 10B, FIG. 10C and FIG. 10D show cross-sectional views of a frame and a partition sheet showing an element assembling step of the method for manufacturing a heat exchanger. FIG. 11 is a plan view of a first element showing a method for measuring a joining strength of the partition sheet to the frame. DETAILED DESCRIPTION OF EMBODIMENT(S) Embodiments will be described below. A ventilator (100) of this embodiment includes a heat exchanger (10) and configured to supply air to and exhaust air from an indoor space. Ventilator As illustrated in FIG. 1, the ventilator (100) includes a casing (110) that houses the heat exchanger (10). The casing (110) includes an outdoor air inlet (111), an air supply port (112), an indoor air inlet (113), and an exhaust port (114). In the internal space of the casing (110), an air supply passage (121) and an exhaust passage (122) are formed. The air supply passage (121) has two ends respectively connected to the outdoor air inlet (111) and the air supply port (112). The exhaust passage (122) has two ends respectively connected to the indoor air inlet (113) and the exhaust port (114). In the ventilator (100), outdoor air flows through the air supply passage (121) toward the inside of the room, and room air flows through the exhaust passage (122) toward the outside of the room. The heat exchanger (10) is located to intersect the air supply passage (121) and the exhaust passage (122). The heat exchanger (10) is disposed in the casing (110) such that the first passage (21) communicates with the air supply passage (121) and the second passage (51) communicates with the exhaust passage (122). The ventilator (100) further includes an air supply fan (131) and an exhaust fan (132). The air supply fan (131) is disposed downstream of the heat exchanger (10) in the air supply passage (121). The exhaust fan (132) is disposed downstream of the heat exchanger (10) in the exhaust passage (122). General Configuration of Heat Exchanger A heat exchanger (10) of this embodiment is a so-called total heat exchanger. In the ventilator (100), this heat exchanger (10) causes outdoor air (supply air) supplied into a room and room air (exhaust air) exhausted out of the room to exchange sensible heat and latent heat (moisture). As illustrated in FIGS. 2 and 3, the heat exchanger (10) is formed in a prism shape having polygonal end faces. Each end face of the heat exchanger (10) of this embodiment has a horizontally