JPWO2020012572A1 - How to manufacture heat exchangers and heat exchangers - Google Patents

Abstract

A heat exchanger (4) in which a plurality of unit constituent members (1) composed of a partition member and an interval holding member are laminated, and the partition member is subjected to a wet treatment for moistening and a drying treatment for drying from a wet state. Is given.

Description

The present invention relates to a heat exchanger and a method for manufacturing a heat exchanger of a ventilation device that exchanges heat between a supply air flow and an exhaust flow for ventilation.

In recent years, air conditioning equipment for heating and cooling has been developed and spread. As the living area using air conditioners expands, the importance of heat exchangers for air conditioners that can recover temperature and humidity in ventilation is also increasing. As such a heat exchanger for air conditioning, a partition plate having heat transfer property and moisture permeability is conventionally used in which a plurality of layers are laminated with a spacing plate sandwiched between them. The partition plate is a square flat plate, and the spacing plate is a corrugated plate in which a serrated or sinusoidal waveform whose projection plane coincides with the partition plate is formed. The forming direction of the waveform of the interval plate is alternately set to 90 degrees or an angle close to 90 degrees, and the interval plate is sandwiched between the partition plates, and the flow path through which the primary airflow passes and the flow path through which the secondary airflow passes alternately. It has an installed configuration.

Further, there have been proposed a heat exchanger integrally formed with a partition plate using a resin for a spacing plate, and a heat exchanger configured by punching out a plastic cardboard to form an air passage and adhering it to the partition plate.

In a heat exchanger having a structure in which a partition plate and a spacing plate are laminated, if the partition plate is wrinkled or loosened, the partition plate bends and the pressure loss in the flow path becomes large.

According to Patent Document 1, the partition member is configured to have a functional layer having heat transfer property, moisture permeability and gas shielding property, and a heat shrinkage layer that shrinks at a set temperature or higher, and the heat shrinkage rate of the heat shrinkage layer. Has proposed a total heat exchange element characterized in that it has a larger heat shrinkage rate than the resin used for the interval holding member. The total heat exchange element disclosed in Patent Document 1 is provided with a functional layer having heat transfer property, moisture permeability, and gas shielding property and a heat shrinkage layer that shrinks at a set temperature or higher in a partition member, and the partition member and a space holding member. By heating after integral molding, the deflection of the partition member is eliminated and the increase in pressure loss in the flow path is prevented.

Japanese Patent No. 5748863

In the heat exchanger described in Patent Document 1, it is necessary to use a special partition member having two layers, a functional layer and a heat shrink layer, in order to eliminate the deflection of the partition member and prevent an increase in pressure loss in the flow path. There was a problem that there was.

The present invention has been made in view of the above, and an object of the present invention is to obtain a heat exchanger in which the deflection of the partition member is suppressed without using a special partition member.

In order to solve the above-mentioned problems and achieve the object, the present invention is a heat exchanger in which a plurality of unit constituent members composed of a partition member and a spacing member are laminated, and the partition member is wetted. Wet treatment is applied. Further, the partition member is subjected to a drying process of drying from a wet state.

The heat exchanger according to the present invention has an effect that the deflection of the partition member can be suppressed without using a special partition member.

A perspective view showing a unit component of the heat exchanger according to the first embodiment of the present invention. Perspective view of the heat exchanger according to the first embodiment Flow chart showing the manufacturing process of the heat exchanger according to the first embodiment The figure which shows the state which laminated the unit component in the manufacturing process of the heat exchanger which concerns on Embodiment 1. The figure which shows the relationship between the change of the whole size of the heat exchanger which concerns on Embodiment 1 and the repetition of wetting and drying. Flow chart of another manufacturing process of the heat exchanger according to the first embodiment Perspective view of the unit constituent member of the heat exchanger according to the second embodiment of the present invention. Perspective view of the heat exchanger according to the second embodiment Flow chart showing the manufacturing process of the heat exchanger according to the second embodiment Perspective view of the first unit component of the heat exchanger according to the third embodiment of the present invention. Perspective view of the second unit component of the heat exchanger according to the third embodiment. Perspective view of the heat exchanger according to the third embodiment

Hereinafter, the heat exchanger and the method for manufacturing the heat exchanger according to the embodiment of the present invention will be described in detail with reference to the drawings. The present invention is not limited to this embodiment.

Embodiment 1.
FIG. 1 is a perspective view showing a unit component of the heat exchanger according to the first embodiment of the present invention. FIG. 2 is a perspective view of the heat exchanger according to the first embodiment. The unit constituent member 1 is composed of a flat plate-shaped partition member 2 and a corrugated plate-shaped spacing member 3. The partition member 2 and the spacing member 3 are bonded to each other at the corrugated apex of the spacing member 3 by an adhesive or heat fusion. The partition member 2 has a gas shielding property, and exchanges temperature and humidity without mixing gas between the supply air and the exhaust gas. The partition member 2 is made of a non-porous material mainly composed of cellulose fibers. Paper can be exemplified as a non-porous material mainly composed of cellulose fibers. The partition member 2 may be impregnated with a hygroscopic agent in order to improve the humidity exchange performance. The space-holding member 3 is made of corrugated processed paper, and keeps the space between the adjacent partition members 2 constant. The interval holding member 3 does not have to have a gas shielding property.

The heat exchanger 4 is a right-angled flow type in which a plurality of unit constituent members 1 are alternately laminated while changing their directions by 90 degrees to form a square columnar shape. By being laminated in this way, the air passages constituting the heat exchanger 4 become the first air passages that pass through one of the pair of the two opposing sides of the square pillar, and the other is the two facing sides of the square pillar. It becomes the second air passage that passes through the other side of the pair. Air flows into the first air passage along the arrow A, and air flows out along the arrow A'. Air flows into the second air passage along the arrow B, and air flows out along the arrow B'. The first air passage and the second air passage configured in the heat exchanger 4 are independent and are separated by a partition member 2 having a gas shielding property, so that there is no air leakage. The heat exchanger 4 can exchange heat and humidity between the air passing through the first air passage and the air passing through the second air passage through the partition member 2.

The heat exchanger 4 is arranged at the intersection of the exhaust air passage and the supply air air passage in the heat exchange ventilation device, and exchanges heat between the exhausted indoor air and the supplied outside air. When ventilating in a room where air conditioning is used, heat can be recovered from the exhausted indoor air, so that the load on the air conditioning can be reduced. For example, the temperature and humidity are exchanged between the air supply that supplies cold and dry outside air into the room and the exhaust flow that exhausts warm and humid indoor air to the outside through the partition member 2. As a result, the warmed and humidified air supply is supplied to the room, and the cooled and dehumidified exhaust gas is discharged to the outside of the room.

FIG. 3 is a flowchart showing a manufacturing process of the heat exchanger according to the first embodiment. In step S1, the unit component 1 is created. In step S1, which is a unit component member creating step, an adhesive is applied to the corrugated apex of the corrugated spacing member 3, and the partition member 2 and the spacing member 3 are adhered to each other. The unit constituent member 1 is created by cutting the bonded partition member 2 and the interval holding member 3 so as to have the size of the heat exchanger 4.

In step S2, the unit constituent members 1 are laminated. In step S2, which is a laminating step, an adhesive is applied to the corrugated apex on the side that is not adhered to the partition member 2 of the interval holding member 3 constituting the unit constituent member 1, and the unit constituent member 1 is applied to each layer. Stack them alternately so that they are oriented at right angles. After laminating the required number of sheets, each layer is adhered by drying the adhesive.

In step S3, a wetting treatment is performed in which the laminated body of the unit constituent members 1 is moistened by ventilating high humidity air. In step S3, which is a wetting step of performing the moistening treatment, the partition member constituting the unit component 1 is blown by high-humidity air adjusted by a constant temperature and humidity chamber or a humidifier, or air sprayed with mist-like water droplets. Moisten. The laminated body of the unit constituent member 1 may be arranged in a high humidity space such as a constant temperature and humidity constant bath. Further, the laminated body of the unit constituent members 1 may be ventilated in a highly humid space. High humidity air can be exemplified at 20 ° C. (DB), 95% RH.

In step S4, a drying process is performed to dry the laminated body of the wet unit constituent members 1. In step S4, which is a drying step of performing the drying treatment, the drying air adjusted by the constant temperature and humidity chamber or the dehumidifier is ventilated through the laminate moistened in step S3, and the partition member 2 is dried. In the drying step, the laminate may be dried by leaving it in a dry constant temperature and humidity chamber or by ventilating in a dry space. Further, the laminate may be dried using a high frequency dielectric heating dryer. At this time, the dry air can be exemplified at 50 ° C. (DB) and 20% RH.

In step S5, the outer dimensions are reduced by the wetting in step S3 and the drying in step S4, and the outer periphery of the laminated body whose outer shape is stabilized is cut and the dimensions are adjusted to complete the heat exchanger 4.

FIG. 4 is a diagram showing a state in which unit constituent members are laminated in the manufacturing process of the heat exchanger according to the first embodiment. At the time when the unit constituent members 1 are laminated, as shown in FIG. 4, the partition member 2 in the portion between the two adjacent spacing members 3 in the partition member 2 has wrinkles and slacks, and the partition member 2 has wrinkles and slacks. The member 2 is bent. However, by ventilating high-humidity air in step S3 after laminating and then drying in step S4, the partition member 2 contracts, and wrinkles and slack existing in the partition member 2 can be removed. Therefore, even if the partition member 2 is made of paper, which is a non-porous material mainly composed of cellulose fibers, it is possible to suppress an increase in air passage pressure loss due to wrinkles and slack. Therefore, the heat exchanger 4 in which the air passage pressure loss is suppressed can be realized by a simple method while suppressing the cost increase. Further, it is possible to suppress the deflection of the partition member 2 without using a material such as a resin film having high dimensional stability, which causes an increase in cost.

Further, the heat exchanger 4 mainly composed of paper causes a phenomenon that the heat exchanger 4 shrinks as a whole over time due to repeated wetting and drying in an actual usage environment. Therefore, a gap is formed between the air passage wall of the ventilation device in which the heat exchanger 4 is arranged and the heat exchanger 4, and an air flow that does not pass through the heat exchanger 4 is generated, or the supply air and the exhaust air are separated from each other. There was a problem that the effective ventilation volume rate was lowered due to the leakage of ventilation air such as mixing.

FIG. 5 is a diagram showing the relationship between the change in the overall dimensions of the heat exchanger according to the first embodiment and the repetition of wetting and drying. As shown in FIG. 5, when the cumulative number of wet and dry is small, the amount of reduction is large, and as the cumulative number of wet and dry increases, the amount of reduction of the overall size of the heat exchanger 4 gradually decreases. It shows a tendency to converge toward a certain limit reduction dimension. Therefore, by performing steps S3 and S4, the overall dimensions of the heat exchanger 4 can be forcibly converged to some extent. Since the difference between the size at the manufacturing stage of the heat exchanger 4 and the limit shrinkage size can be kept small, the size of the heat exchanger 4 becomes the entire size over time due to repeated wetting and drying in the actual usage environment. Even in the case of shrinking, the amount of dimensional change due to shrinkage can be reduced. Therefore, the heat exchanger 4 can suppress the decrease in the effective ventilation volume rate due to the leakage of the ventilation air by the amount that the dimensional change with time due to the contraction is reduced.

FIG. 6 is a flowchart of another manufacturing process of the heat exchanger according to the first embodiment. The manufacturing process shown in FIG. 6 is different from the manufacturing process shown in FIG. 3 in that it has step S6 for determining whether or not wetting and drying have been performed a set number of times between steps S4 and S5. If wetting and drying have not been performed a set number of times, the result is No in step S6, and the process returns to step S3. When wetting and drying are performed a set number of times, the result is Yes in step S6, and the process proceeds to step S5.

Ideally, wetting and drying are repeated until the size of the laminate reaches the limit shrinkage size, but the higher the number of repetitions, the lower the productivity. Furthermore, the amount of shrinkage per wet and dry operation decreases as the cumulative number of times increases, so it is not efficient to increase the number of repetitions unnecessarily. The relationship between the change in the overall dimensions of the heat exchanger 4 and the cumulative number of times depends on the structure and material of the heat exchanger. Therefore, it is necessary to set an appropriate number of times for each heat exchanger, but in reality, the cumulative number of times is about 2 to 5 times, which is the number of times that the productivity and the effect of forced shrinkage can be balanced.

By repeating wetting and drying a plurality of times in this way, the overall size of the heat exchanger 4 can be forcibly greatly contracted, and the difference from the limit shrinkage size can be made smaller at the initial stage. Compared with the case where wetting and drying are performed only once, the decrease in the effective ventilation rate due to the leakage of ventilation air can be further suppressed.

With the above structure, the heat exchanger 4 reduces the pressure loss by improving the wrinkles and slack of the partition member 2. Further, by shrinking at the manufacturing stage so that the difference from the limit shrinkage dimension becomes small, it is possible to reduce the increase in the amount of leaked air due to the dimensional shrinkage over time.

The heat exchanger 4 according to the first embodiment can be used as a ventilation device for a house or a building. Therefore, the heat exchanger 4 according to the first embodiment can be an energy-saving device for a house or a building. Since the heat exchanger 4 according to the first embodiment can reduce the increase in the leakage rate due to aged deterioration and can extend the heat exchanger replacement cycle, the maintainability of the installed ventilation device can be improved and maintained. The cost can be reduced.

Embodiment 2.
FIG. 7 is a perspective view of a unit component of the heat exchanger according to the second embodiment of the present invention. The unit constituent member 1 is composed of a partition member 2 and a spacing member 3. The space-holding member 3 is a molded resin product, and is integrally composed of a frame on the outer peripheral portion and a plurality of ribs for holding the space between the unit constituent members 1. The partition member 2 and the interval holding member 3 are integrally formed by insert molding the partition member 2 at the time of resin molding of the interval holding member 3. However, the partition member 2 and the spacing member 3 may be configured by adhering the partition member 2 to the spacing member 3 with an adhesive. When the unit constituent member 1 is manufactured by adhesion, the interval holding member 3 may be formed from a sheet material such as plastic corrugated cardboard. The thickness and shape of the interval holding member 3 are not limited as long as the interval between the partition members 2 can be kept constant and the air permeability in each air passage can be ensured.

FIG. 8 is a perspective view of the heat exchanger according to the second embodiment. The heat exchanger 4 is configured by alternately stacking a plurality of unit constituent members 1 while changing their orientations by 90 degrees, and an adhesive is applied to a rib portion for maintaining the spacing of the spacing members 3. It is fixed by coating or by providing a fitting structure (not shown). The unit constituent members 1 are laminated at regular intervals. In the heat exchanger 4 shown in FIG. 8, each of the four sides of the rectangular parallelepiped formed by stacking in the stacking direction is filled from the end face side with a sealing agent to prevent air leakage. Since the operation of the heat exchanger 4 is the same as that of the heat exchanger 4 shown in the first embodiment, the description thereof will be omitted.

FIG. 9 is a flowchart showing a manufacturing process of the heat exchanger according to the second embodiment. In step S11, the unit constituent member 1 is created by the partition member 2 and the interval holding member 3. Step S11 is a unit constituent member creation step for creating the unit constituent member 1. In step S12, high humidity air is ventilated through the unit component 1. Step S12 is a wetting step of wetting the partition member 2 constituting the unit constituent member 1. In step S13, the unit component 1 is dried. Step S13 is a drying step of drying the wet partition member 2. By drying the unit constituent member 1, the partition member 2 contracts, and the wrinkles and slack existing in the partition member 2 are removed. In step S14, a plurality of unit constituent members 1 from which wrinkles and slack have been removed are laminated. Step S14 is a laminating step of laminating the dried unit constituent members 1. In step S15, the outer periphery of the laminated body is cut and the dimensions are adjusted to complete the heat exchanger 4.

In the heat exchanger 4 according to the second embodiment, the outer periphery of the unit constituent member 1 is formed of a rigid resin frame with almost no dimensional change due to repeated wetting and drying. Therefore, even if the unit component 1 is wetted and dried, the overall shape of the unit component 1 does not warp or shrink due to the shrinkage of the partition member 2, and the wrinkles and slack of the partition member 2 are removed. be able to.

Further, in the first embodiment, since wetting and drying are performed after laminating, wetting or drying is performed in order to wet or dry into each air passage between the unit constituent members 1 which are not exposed to the outside. It was necessary to increase the exposure time per exposure or to ventilate each passage of the heat exchanger to moisten or dry it. However, in the second embodiment, since the unit component 1 is wetted and dried, the partition member 2 exposed to the outside can be easily wetted and dried. Therefore, it is not necessary to blow air to moisten and dry, and the unit component 1 can be moistened and dried simply by leaving the unit component 1 in a high-humidity tank or a constant temperature bath for a short time. Further, in the wetting step, it is possible to spray water droplets in the form of mist to moisten in a shorter time. Therefore, the productivity can be improved as compared with the first embodiment.

Embodiment 3.
FIG. 10 is a perspective view of a first unit component of the heat exchanger according to the third embodiment of the present invention. In the first unit constituent member 11 of the heat exchanger 4 according to the third embodiment, the interval holding member 3 is arranged on one surface of the partition member 2. The partition member 2 has a hexagonal shape, and more specifically, a shape in which an isosceles triangle is connected to each of two opposing sides of a rectangle. The interval holding member 3 extends in a crank shape by connecting one equilateral side of one isosceles triangle of the partition member 2 and one of the equilateral sides of the other isosceles triangle. Air flows into the first air passage along the arrow C, and air flows out along the arrow C'.

FIG. 11 is a perspective view of a second unit component of the heat exchanger according to the third embodiment. In the second unit constituent member 12 of the heat exchanger 4 according to the third embodiment, the interval holding member 3 is arranged on one surface of the partition member 2. The partition member 2 has a hexagonal shape, and more specifically, it has a shape in which an isosceles triangle is connected to each of two opposing sides of a rectangle. The interval holding member 3 extends in a crank shape by connecting one equilateral side of one isosceles triangle of the partition member 2 and one of the equilateral sides of the other isosceles triangle. Air flows into the second air passage along the arrow D, and air flows out along the arrow D'.

FIG. 12 is a perspective view of the heat exchanger according to the third embodiment. The heat exchanger 4 is configured by alternately stacking the first unit constituent member 11 and the second unit constituent member 12. That is, the heat exchanger 4 according to the third embodiment has two types of unit constituent members, a first unit constituent member 11 and a second unit constituent member. By alternately stacking the first unit constituent member 11 and the second unit constituent member 12, the first air passage and the second air passage are alternately arranged with the partition member 2 interposed therebetween. The heat exchanger 4 according to the third embodiment is a countercurrent type in which the direction of the airflow passing through the first air passage and the direction of the airflow passing through the second air passage face each other inside the heat exchanger 4. The heat exchanger 4 according to the third embodiment can also be used in a parallel flow manner by making the airflow passing through the first air passage or the second air passage in the opposite direction. The operation at the time of heat exchange and the manufacturing method of the heat exchanger 4 are the same as those of the heat exchanger 4 according to the first embodiment.

The heat exchanger 4 according to the third embodiment has a higher heat exchange efficiency than the heat exchanger 4 according to the first or second embodiment of the orthogonal flow type by performing heat exchange in a countercurrent type. Can be done. Further, the heat exchanger 4 according to the third embodiment is generated inside more than the heat exchanger 4 according to the first embodiment or the second embodiment of the orthogonal flow type by performing heat exchange in the parallel flow type. The temperature difference can be reduced.

The configuration shown in the above-described embodiment shows an example of the content of the present invention, can be combined with another known technique, and is one of the configurations without departing from the gist of the present invention. It is also possible to omit or change the part.

1 unit component member, 2 partition member, 3 interval holding member, 4 heat exchanger, 11 first unit component member, 12 second unit component member.

Claims (7)

A heat exchanger in which a plurality of unit constituent members composed of a partition member and an interval holding member are laminated.
A heat exchanger characterized in that the partition member is subjected to a wetting treatment for moistening and a drying treatment for drying from a wet state. The heat exchanger according to claim 1, wherein the partition member is subjected to the wetting treatment and the drying treatment a plurality of times. The heat exchanger according to claim 1 or 2, wherein a plurality of the unit constituent members obtained by subjecting the partition member to the wetting treatment and the drying treatment are laminated. The heat exchanger according to claim 1 or 2, wherein a plurality of the unit constituent members are laminated, and then the partition member is subjected to the wetting treatment and the drying treatment. It is a method of manufacturing a heat exchanger in which a plurality of unit constituent members composed of a partition member and an interval holding member are laminated.
A unit component creating process for creating a plurality of the unit components, and
A laminating process of laminating a plurality of the unit constituent members, and
A wetting step of wetting the plurality of stacked unit components,
A method for manufacturing a heat exchanger, which comprises a drying step of drying a plurality of the wet unit components. It is a method of manufacturing a heat exchanger in which a plurality of unit constituent members composed of a partition member and an interval holding member are laminated.
A unit component creating process for creating a plurality of the unit components, and
A wetting step of wetting a plurality of the unit components and
A drying step of drying the plurality of moistened unit components,
A method for manufacturing a heat exchanger, which comprises a laminating step of laminating a plurality of the unit constituent members. The method for manufacturing a heat exchanger according to claim 5 or 6, wherein the wetting step and the drying step are performed a plurality of times.

Images