JPH11348097A - Resin-made heat exchanger and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To add an antibacterial agent by reducing a size, a thickness and further a weight, simplifying formation of a heat exchanger into a predetermined shape, simply manufacturing the exchanger particularly by a blow molding and providing an excellent corrosion resistance without rusting. SOLUTION: Condensers 1, 2 of translucent/transparent resin of a blow molding each has an inlet 11 of a fluid to be condensed provided in an upper portion and an outlet 12 of the fluid and a condensate discharging portion 13 provided in a lower portion, more number of substantially vertical fluid-to-be-condensed passing tubes than that of substantially horizontal passing tubes, sectional areas of the fluid-to-be-condensed passing tubes smaller than those of the horizontal tube, and a heat exchanging fluid passing space provided between the passing tubes. Ribbed protrusions are formed on inner wall surfaces of the condensers 1, 3 by blow molding. Heat exchanging areas are increased by the protrusions, and the condensate easily flows, thereby improving its heat exchanging efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin heat exchanger used for a dehumidifier equipped with a rotary dehumidifier and a method for manufacturing the same.

[0002]

2. Description of the Related Art Generally, heat exchangers are made of metal from the viewpoint of heat conductivity, and many of them are provided with a large number of metal fins in order to increase heat exchange efficiency. As a heat exchanger for removing humidity, a honeycomb heat exchanger provided with a moisture absorbent is used. These heat exchangers are difficult to manufacture, and rust occurs with metal ones,
There is a drawback that the weight is heavy, and the honeycomb heat exchanger has a drawback that it is difficult to eliminate leakage of the heat exchange fluid. In particular, the honeycomb-shaped heat exchanger has a drawback that the volume cannot be reduced due to its large volume such as a cylindrical shape from the viewpoint of heat exchange efficiency. In particular, in a dehumidifier provided with a rotary dehumidifier, a heat exchanger used as a condenser for removing moisture from the regeneration air has been desired to be small and light.

[0003]

Accordingly, an object of the present invention is to provide a resin heat exchanger which is simple to manufacture, has a small shape, and is lighter in weight than metal. The present invention also provides a dehumidifying heat exchanger suitable for a dehumidifier provided with a rotary dehumidifier. Further, the present invention provides a method for manufacturing these heat exchangers.

[0004]

In order to solve the above-mentioned problems, a resin heat exchanger according to the present invention has a plurality of heat exchange fluid passages communicating with each other therein. And a hollow shape having a common heat exchange fluid introduction opening and discharge opening.

This heat exchanger is a resin heat exchanger having a plurality of vertical rib-like projections formed on the inner wall side, and is formed by blow molding. In this heat exchanger, a fluid to be condensed is introduced as a heat exchange fluid, and a liquid generated by condensation is taken out. Further, in this heat exchanger, a space is provided between adjacent heat exchange passages to allow a fluid to be exchanged with the heat exchanger to pass therethrough. .

In this heat exchanger, the heat exchange passage comprises a substantially vertical passage and a substantially horizontal passage connecting these passages, and the number of substantially vertical passages is substantially equal to the number of substantially horizontal passages. More than that.

This heat exchanger is provided with an inlet for the condensed fluid at the upper part and an outlet for the condensed fluid and a condensate discharge part at the lower part.

In addition, a plurality of the heat exchangers are stacked, and the fluid introduction portions and the fluid outlet portions of the individual heat exchangers are connected to form a composite heat exchanger.

Further, the cross-sectional area of the condensed fluid passage tube in the substantially vertical direction is smaller than the cross-sectional area of the condensed fluid passage tube in the substantially horizontal direction. Further, it is made of a transparent or translucent resin molded product. Further, it is made of a resin molded product to which an antibacterial agent is added. According to the present invention, since it is made of resin, it is easy and lightweight to manufacture, and even if the fluid passing through the inside of the heat exchanger is a wet and warm fluid, it does not rust, like ordinary metal, It also has excellent corrosion resistance. In addition, as described later, an antimicrobial agent can be easily added to a resin molded product.

The condensed fluid passage in the substantially vertical direction is cooled, and the condensed fluid inside is condensed and adheres to the inner wall of the passage. However, since the condensed fluid is substantially in the vertical direction, the condensed liquid falls smoothly downward. To go. Further, the number of the substantially horizontal condensed fluid passages serves as a distribution pipe for dividing the condensed fluid in parallel with the substantially vertical condensed fluid passages.

Further, as described above, the substantially horizontal condensed fluid passage serves as a distribution pipe for dividing the condensed fluid in parallel with the substantially vertically condensed fluid passage, so that the cross-sectional area thereof is as follows. A slightly larger fluid passage is easier for the condensed fluid to pass, and a smaller cross-sectional area of the substantially vertically condensed fluid passage is advantageous for cooling and condensing the fluid to be condensed, because heat exchange is easier.

Further, the condensed fluid exchanges heat and is cooled and condenses, and the condensed liquid falls downward. By taking in the condensed fluid from the upper part and blowing and moving the condensed fluid by the regenerating fan toward the lower condensed fluid discharge part, it matches the falling direction of the condensed liquid and contributes to the improvement of the condensation efficiency. . Further, a condensed liquid discharge section is provided at a lower portion to easily discharge the dew condensation liquid.

Further, since it is formed by blow molding, it is easy to form a complicated and leak-free fluid passage to be condensed, and if necessary, a hole can be formed by post-processing. . Also, blow molding has a very low mold cost compared to injection molding and the like.

[0014] Further, since it is a transparent or translucent resin molded product, a state in which the condensed fluid is cooled, condensed, and dewed inside the condenser can be visually recognized from the outside of the condenser.

[0015] Further, since the resin molded product to which the antibacterial agent is added, even if the condensed fluid passing through the inside of the condenser is repeatedly used in a closed circuit for a long period of time, the propagation of bacteria can be prevented. .

Further, when the composite condenser is viewed from the front, the condensed fluid introduction portions and the condensed fluid outlet portions of the individual condensers are connected at the same position where they are overlapped. The condensed fluid introduction section and the condensed fluid outlet section are connected to each other at the shortest distance. Therefore, the fluid to be condensed can be quickly distributed to the individual condensers at the introduction portion, and the fluid to be condensed from the individual condensers can be quickly collected at the outlet portion.

The method for manufacturing a heat exchanger according to the present invention is widely applicable as a method for manufacturing a hollow molded article. The hollow molded article is manufactured by extruding and blow-molding a tubular parison of a thermoplastic resin. A method in which a cylindrical molten resin parison having a plurality of rib-like projections formed on an inner wall side is extruded and blow-molded to form a plurality of rib-like projections in a parison pushing direction on the inner wall side of a hollow molded article.

Further, the production method of the present invention is a method of producing a hollow molded article by extruding and blow-molding a cylindrical parison of a thermoplastic resin. After blending the additive with a solid piece that does not melt at the resin temperature at the time of molding the molding resin material, blend it with the molding resin material, extrude it as a cylindrical molten resin from a parison, blow-mold it, and mold it on the inner wall side of the molded product Protrusions are formed by the presence of small solid pieces blended with the resin material.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] A case where a resin heat exchanger according to the present invention is used as a condenser will be described below as an embodiment.

FIG. 1 is a schematic perspective view of a composite condenser made of resin according to an embodiment of the present invention. FIG. 2 is a front view.
FIG. 3 is a sectional view taken along the line AA of FIG. FIG. 4 is a sectional view taken along the line BB of FIG. Hereinafter, the structure of the condenser will be described with reference to FIGS.

In FIG. 1, reference numerals 1 and 2 denote condensers, respectively, which are hollow blow-molded articles made of a translucent polypropylene resin and use an antibacterial resin. Hereinafter, the condenser 1 will be described, but unless otherwise specified, the condenser 2 has the same shape.

The condenser 1 has a length and width of 30 cm and a thickness of 2.5 c.
The upper horizontal pipe 14 which connects the upper part substantially horizontally and the lower horizontal pipe 15 which connects the lower part substantially horizontally as a substantially horizontal condensed fluid passage pipe which is a square of m and is a condensed fluid passage. , Two horizontal pipes 16 connected substantially horizontally between the upper part and the lower part, and a number of substantially vertical condensed fluids which communicate substantially vertically between the substantially horizontal condensed fluid passage pipes. A passage pipe 17 is formed.

The cross-sectional shape of the condensed fluid passage pipe 17 in the substantially vertical direction is substantially elliptical (for example, having a major axis of 2) whose width is smaller than its depth so as not to hinder the progress of the heat exchange fluid orthogonal to the condenser 1. 0.5 cm and a short diameter of 0.8 cm), and a space 18 is provided between the adjacent condensed fluid passage pipe 17 to allow the fluid to be exchanged with the condenser 1 for heat. The cross-sectional shape of the horizontal pipe 16 is substantially circular (2.
5 cm in diameter), and its cross-sectional area is larger than the cross-sectional area of the condensed fluid passage pipe 17 in the vertical direction. The wall thickness is 1
mm to about 2 mm.

At one end of the upper horizontal pipe 14, a condensed fluid introduction part 11 which is a hole opened in the front of the condenser is formed. At one end of the lower horizontal pipe 15, the condensed fluid introduction part 11 is formed.
On the opposite side, a condensed fluid lead-out portion 12 which is a hole opened in the front of the condenser is provided. The holes 11 and 12 distribute the taken-in condensed fluid to a large number of substantially vertical condensed fluid passage pipes 17 and collect the fluid from the large number of substantially vertical condensed fluid passage pipes 17. The cross-sectional area is large.

Numeral 13 denotes a condensate discharge part, whose opening is located at the lowest position where the contents of the condenser 1 are guided, as shown in FIG. It is inclined toward the discharge unit 13. A space 18 for passing a fluid to be subjected to heat exchange with the condenser 1 and a screw hole 19 for fixing are removed by a Thomson type after blow processing, and a condensed fluid introduction part 11, a condensed fluid outlet part 12, and a condensed liquid discharge part The opening 13 is drilled by machining. Furthermore, condenser 1
Many rib-shaped protrusions are formed in the vertical direction on the inner surface of
It works for heat exchange and condensate guide.

Since the condensers 1 and 2 are formed by blow molding, it is easy to form a complicated and leak-free condensed fluid passage tube, and if necessary,
Drilling can also be performed in post-processing. Also, blow molding has a very low mold cost compared to injection molding and the like. Also, since it is made of resin, it is lightweight.

Further, since the condensers 1 and 2 are made of a translucent resin, it is possible to visually confirm from outside the state that the fluid to be condensed is cooled and condensed inside the condensers 1 and 2. In a dehumidifier using a rotary dehumidifier, when heated hot air is blown onto the rotary dehumidifier that has absorbed moisture to remove moisture and cool the moist air with a condenser to form dew, The condition of dehumidification can be visually observed, and it can also be used for failure diagnosis at the time of abnormality.

As shown in FIG. 3, the condensers 1 and 2 are provided at the same position, respectively, at the opening of the condensed fluid introduction parts 11 and 21, the condensed fluid discharge parts 12 and 22, and the condensed liquid discharge parts 13 and 23. Is provided. However, since the condensed fluid introducing portion 11 and the condensed fluid deriving portion 12 of the condenser 1 are connected to the condensed fluid introducing portion 21 and the condensed fluid deriving portion 22 of the condenser 2, both the front surface and the back surface have openings. On the other hand, the condensed fluid introduction part 21 and the condensed fluid derivation part 22 of the condenser 2 have openings only on the front surface, and do not have openings on the back surface. The opening can be formed by post-processing.

In order to combine the condenser 1 and the condenser 2 to form a composite condenser, the respective condensed fluid introducing portions 11 and 21 are provided.
The condensed fluid outlets 12 and 22 are connected via a packing 3, and are fixed and connected at two places using a U-shaped metal spring plate 4 having elasticity as shown in FIGS. As described above, since a plurality of condensers are overlapped and combined in the composite condenser, assembly and disassembly of the individual condensers are easy.

The distance between the condenser 1 and the condenser 2 is determined by the condensed fluid introduction parts 11 and 21 and the condensed fluid derivation parts 12 and 22. Referring to FIG. However, in order to secure a predetermined interval, the condenser 1 and the condenser 2
Accordingly, projections (not shown) are provided at positions facing each other. That is, a predetermined interval is secured between the condenser 1 and the condenser 2 at approximately four corners.

The openings of the condensed liquid discharge portions 13 and 23 of the condensers 1 and 2 are cylindrical, and a discharge tube 5 made of a single rubber tube is inserted therein. The movement of the condensed liquid discharge parts 13 and 23 of the condensers 1 and 2 is restricted because the liquid is inserted into one discharge pipe 5.

Since the condenser 1 and the condenser 2 have substantially the same shape, the same mold may be used, but some post-processing such as drilling is required. However, if the same mold and the same shape are used, it cannot be used as in the other embodiments described below. In this case, it is necessary to take measures such as mounting the condenser 1 and the condenser 2 so as to be shifted from each other to form a composite condenser. It is necessary to consider the positions of the condensed fluid introduction parts 11 and 12 and the condensed fluid derivation parts 12 and 22 according to the shifted assembly method.

First, the structure of a dehumidifier provided with a rotary dehumidifier in which the resin heat exchanger according to the present invention is used as a condenser will be described.

FIG. 5 is an explanatory view of the entire structure of the dehumidifier. The dehumidifying rotor 31 has a zeolite (hygroscopic agent) supported on the surface or inside of a honeycomb rotor in which a single-wave molded body is wound on a flat sheet. The zeolite has no deliquescent phenomenon, and has a crystalline and stable pore structure. With less deterioration due to moisture adsorption and stable moisture absorption for a long time.

The air 32 to be dehumidified is sucked by the dehumidifying fan 45, and coarse dust is removed by the filter 33.
And cools the regeneration air inside the warm and moist condenser, as described later, to condense moisture in the regeneration air. The dehumidified air 32 that has passed through the condenser 34 passes through the dehumidifying rotor 31 and is absorbed by a desiccant to become dry air 36. The heat is recovered by the heat recovery heat exchanger 35 and then released into the room.

In order to regenerate the desiccant of the dehumidifying rotor 31 which has absorbed moisture, the regeneration air is heated to 200 ° C. to 250 ° C. by a regeneration heater 37 which is an electric heater, and then blown to the dehumidification rotor 31 by a regeneration fan 38. . The heated regenerated air receives moisture from the desiccant of the dehumidifying rotor 31 and becomes warm and moist air.
It cools in 4 and condenses and discharges water. Condensation water 3
9 is guided to the water receiving tank 40 via the discharge part 13. The water receiving tank 40 is provided with a float switch for detecting a water level. When a predetermined water level is detected, the pump 40 provided is operated and the water storage tank 4 is passed through the water pumping tube 46.
Dew water 39 is stored in 2.

The dehumidifying rotor 31 is rotated by a drive motor (not shown), and the dehumidifying section through which the air 32 to be dehumidified passes and the regenerating section through which the heated hot air passes gradually rotate. Reproduced and can be used continuously.

Since the heated hot air passes through the dehumidifying rotor 31 and rotates little by little, the dehumidifying rotor 31 is warmed. Since the dehumidified air 32 passes here, the heat recovery heat exchanger 35 is heated by the dried air 36 warmed after passing.
To recover heat. The regeneration air after the dew condensation water 39 is discharged from the condenser 34 passes through the inside of the heat recovery heat exchanger 35, and the power of the regeneration heater 37 can be saved by the amount of the heated air. As described above, the regeneration air forms a closed circuit and is used repeatedly.

As the condenser, metal is usually used because of heat conduction and the like. Unlike a refrigeration cycle type dehumidifier using a compressor, a dehumidifier equipped with a rotary dehumidifier (dehumidification rotor) is used. Utilizing the features of light weight and low noise / vibration, it can be easily developed into a desk-mounted type, wall-mounted type and the like. Therefore, a resin heat exchanger 34 is used. As a result, cost, weight, and the like, which are problems in the ordinary metal condenser, are improved. In addition, the rust, corrosion, and bacterial growth of the condenser where the warm and humid air is repeatedly used are also improved.

Further, since the heat exchanger 34 is made of resin,
Not only can a closed circuit be easily formed, but also leakage of regeneration air can be eliminated. In addition, because of the thin shape, the entire dehumidifier is reduced in size.

Next, the flow of the fluid to be condensed inside the heat exchanger 34, that is, inside the composite condenser will be described. In the dehumidifier using the rotary dehumidifying material 31, in the embodiment in which heated hot air is blown to the rotary dehumidifying material 31 that has absorbed moisture, the moisture is deprived and the moist regenerated air is cooled by the condenser 34 and condensed. The condensed fluid taken into the condenser 1 constituting the condenser 34 from the condensed fluid introduction part 11 is:
The condensed fluid introduction part 21 of the condenser 2 connected in an overlapping manner
Flows almost simultaneously, and is distributed through the upper horizontal pipe 14 having a large cross-sectional area to a number of substantially vertically condensed fluid passage pipes 17.

The condensed fluid introduction portions 11 and 2 of the condensers 1 and 2
1. Since the condensed fluid deriving sections 12 and 22 are connected at the shortest distance, the condensed fluid is introduced into the condenser 1,
2 and the fluid to be condensed from the condensers 1 and 2 can be quickly collected at the discharge portion.

The condensed fluid passage pipe 17 is cooled by the dehumidified air 32, which is a heat exchange fluid, by the blowing of the dehumidifying fan 45, and the high-temperature, moist regenerated air, which is the condensed fluid inside the passage pipe 17, is condensed. Condensation water 39 is generated. The condensed water 39 travels down the inner wall of the passage pipe 17, falls downward, passes through the bottom of the lower horizontal pipe 15, and passes through the opening of the condensate discharge unit 13.
It is collected in a discharge pipe 5 composed of a rubber pipe.

By taking in the condensed fluid from the upper part and blowing and moving the condensed fluid toward the discharge part of the condensed fluid in the lower part by the regenerating fan 38, it coincides with the falling direction of the condensed liquid. Contribute to improvement.

The amount of fluid passing through the two horizontal tubes 16 is appropriately adjusted according to the variation in the amount of the condensed fluid passing through each condensed fluid passage pipe 17 and the amount of the dew condensation fluid. The condensed fluid arriving at the lower horizontal pipe 15 having a large cross-sectional area exits the composite condenser through the condensed fluid outlet 12 together with the portion from the condenser 2.

The substantially horizontal condensed fluid passage pipe serves as a distribution pipe for dividing the condensed fluid in parallel with the substantially vertically condensed fluid passage pipe 17, so that the number thereof is not so large. The slightly larger cross-sectional area allows the condensed fluid to pass through easily, and the substantially vertical condensed-fluid passage pipe 17 has a smaller cross-sectional area with the heat exchange fluid in order to cool and condense the condensed fluid. This is advantageous because the heat exchange efficiency is improved, and a large number is required.

[Method of Manufacturing Heat Exchanger] Next, a method of manufacturing the above heat exchanger will be described. FIG. 6 is a schematic cross-sectional view for explaining a manufacturing apparatus and a manufacturing method for blow-molding the heat exchanger. FIG. 7A is a drawing of the parison head 51 of FIG. FIG. 7B is an enlarged view of a main part of a cut 59 provided in an outer peripheral portion 58 of the head core 54. FIG. 8 shows a plurality of rib-like projections 60 on the inner wall side of the heat exchanger by blow molding. FIG. 8A is a view of the inner wall viewed from the inside, and FIG. 8B is a cross-sectional view thereof. The units of the dimensions displayed in FIGS. 7B and 8B are millimeters, which are approximate values.

In FIG. 6, a resin extruder (not shown) passes through a resin inlet 53 of a die 52 of a parison head 51,
After the cylindrical parison 55 extruded from the cylindrical gap between the inner wall of the die 52 and the outer peripheral portion 58 of the head core 54 is extruded downward, the body split molds 56 and 56 are closed, and the nozzle 57 of the parison head 51 gushes. Compressed air is blown into the inside of the cylindrical parison 55 from the mouth to blow it into a desired shape. 6 and 7, the nozzle 57 for blowing compressed air is provided at the center of the head core 54. However, the nozzle 57 may be provided at another location. For example, the parison 55 may be provided in a part of the split mold 56 to blow through the parison 55 from the side surface of the hollow molded product.

The molten resin fed from the resin extruder fills the cylindrical space between the die 52 of the parison head 51 and the head core 54, and goes down. Going down,
The cylindrical space between the die 52 and the head core 54 is gradually narrowed, and a plurality of cuts 59 having a size of about 10 mm are provided on the outer periphery of the head core 54 at the narrowest portion as shown in FIG. Is formed. FIG. 7B shows a cut 59 provided in the outer peripheral portion 58 of the head core 54.
Are shown in an enlarged manner.

The molten resin is extruded by applying pressure from the upper wide gap to the narrow gap, so that the molten resin is also pushed into the cut 59 of the head core 54, and the inner wall of the cylindrical parison 55 extruded from the parison head 51. On the side, a plurality of rib-like protrusions 60 formed by the cuts 59 are formed. The interval between the outer peripheral portion of the head core 54 where the cut 59 is formed and the inner wall of the die 52 is
The portion of the head core 54 where the notch 59 is not formed
Is narrower than the interval between the outer peripheral portion and the inner wall of the die 52.

The extruded parison 55 has a split mold 56,
The compressed air is blown into the inside of the nozzle 57 through the blowing port of the nozzle 57 to form a hollow molded product. When the compressed air is blown, the parison 55 is stretched along the inner wall surfaces of the split molds 56, 56. Therefore, the plurality of rib-like projections 60 extending in the parison extrusion direction on the inner wall side of the blow-molded hollow molded product are shown in FIG. As shown in FIG.

The shape of the notch 59 shown in FIG. 7B is triangular, but this is only one embodiment. Therefore, for example, a rectangular cut, a trapezoidal cut, or a circular cut, which may be called unevenness, may be used. Conversely, if a notch is made to leave a circular shape on the outer periphery, the outer periphery will be just the kamaboko arranged upward. In addition, the interval, the width, the inclination angle of the cut, the depth of the cut, and the like of these cuts are adjusted as necessary. The “cut” in the present invention includes the concept of forming irregularities.

In the present embodiment, it is better that the water droplets condensed inside the condenser are quickly separated from the inner wall of the condenser and fall downward, and the larger the surface area of the inner wall of the condenser is, the higher the heat exchange efficiency is. For this purpose, a plurality of vertical rib-shaped projections 60 are provided on the inner wall of the hollow molded article.

In the parison head 51, the molten resin exits as a parison 55.
The lower end of the outer peripheral portion 58 and the lower end of the inner wall of the die 52 are
Since the parison 55 is installed at a substantially horizontal position, the parison 55 to be formed descends as it is. The molten resin flows into a narrow gap between the outer peripheral portion 58 of the head core 54 and the inner wall of the die 52,
Since the parison 55 is extruded under pressure and becomes a parison 55, if the lower end of one side extends to a position lower than the lower end of the other side instead of the substantially horizontal position, the parison 55 formed is It escapes to one side that does not extend downward and deforms.

The heat exchanger formed as described above is used as a condenser, but is translucent. Therefore, the appearance that the warm and moist regenerated air is cooled inside the condenser and dew condensation is observed from the outside. It can be confirmed visually. In the case of being transparent or translucent, the plurality of rib-shaped protrusions act as a pattern, which helps to improve the design. In addition, because of the plurality of rib-shaped projections, the surface area of the inner wall of the condenser increases, and the heat exchange efficiency also improves. further,
The plurality of rib-shaped projections running in the vertical direction eliminate warpage in the vertical direction and increase strength.

The flow of the fluid to be condensed inside the condenser will be described. First, the fluid is distributed through the upper horizontal pipe 14 having a large cross-sectional area to a number of substantially vertical pipes 17 to be condensed. The condensed fluid passage pipe 17 is blown by a dehumidifying fan,
The moist high-temperature regenerated air that is cooled by the heat exchange fluid and is the condensed fluid inside the passage pipe 17 is condensed to generate dew water. A plurality of rib-shaped protrusions run in the vertical direction on the inner wall. The condensed water droplets tend to be rounder on the rib-shaped projections than on the plane, become water droplets quickly, travel down the inner wall of the passage tube 17, fall downward, pass through the bottom of the lower horizontal tube 15, and pass through the condensate discharge portion 13. Is discharged from the opening. From the plane,
Drops of water droplets are smoother on the rib-shaped projections.

[Another Example of Heat Exchanger and Manufacturing Method] In the above example, a plurality of rib-like projections 60 are formed vertically on the inner wall of the heat exchanger. It may be formed.

6 and 7, small pieces of solid material having a certain mass, such as mica, talc, glass flakes and fibers, which do not melt at the resin temperature at the time of molding the resin material and are melted in the resin material. When the blow molding is performed by uniformly dispersing the molded product, the outer surface side of the molded product is strongly pressed by the mold 56, so that if the inner wall surface of the mold 56 is polished, the surface has no irregularities. Since only the inner wall side of the blow-molded hollow molded product is blown with compressed air, the resin material swells at a portion of the small solid piece, and a projection is formed. Small pieces of solid matter are scattered around, each of which forms a projection on the inner wall of the hollow molded article. Therefore, projections can be formed inside the heat exchanger.

It should be noted that, in this case, it is not necessary to use a molding device provided with the cut 59 in the head core 54 in this case, and it can be used in a usual blow molding device. Of course, if the molding apparatus shown in FIGS. 6 and 7 is used, it goes without saying that the form of the rib-shaped protrusion and the form of the uneven protrusion can be used together.

When a heat exchanger having uneven projections formed on the inner wall side is used, the water droplets that have condensed tend to become rounder on the projections than on a flat surface inside the condenser. At least it triggers a drop of water. The water droplets formed quickly in this manner are separated from the inner wall of the condenser, travel down the inner wall of the passage pipe 17, fall downward, and are discharged from the opening of the condensate discharge section 13 through the bottom of the lower horizontal pipe 15. You. Also,
Due to the projection, the surface area as the inner wall of the condenser also increases,
Heat exchange efficiency is improved.

When a hollow molded article such as a heat exchanger is produced by blow molding, if the maximum length of the solid small piece is larger than the minimum thickness of the hollow molded article, in the worst case, the hollow molded article is formed. From the outer surface to the inner wall, small pieces of solid material penetrate, and there is a possibility that the degree of sealing of the hollow molded article becomes poor.
In general, many blow molded products are required to be hermetically sealed, such as tanks. Therefore, the maximum length of the small solid piece is made smaller than the minimum thickness of the hollow molded article.

Even if it is attempted to directly blend only a small piece of solid material with a molded resin material in order to form a projection on the inner wall of a hollow molded article, the small solid material piece is not well distributed in the resin material. Therefore, first, the solid particles are blended with the molding resin material after blending the solid particles with additives to the molding resin material, such as pigments and fillers, so that the solid particles can be uniformly blended with the molding resin material. The projections can be uniformly formed by small solid pieces.

As an example, a mica piece ground to a maximum length of about 0.3 mm to 0.1 mm is used as a solid piece, and talc powder is used as an additive (filler) to a molding resin material. I do. Talc is hydrous magnesium silicate _{(4SiO 2 · 3MgO · H 2} O)
In, SiO ₂ is about 60%, a mineral MgO ₂ is made of a main component of about 30%, is used here powder of talc (which is usually a particle size of 5 microns or less.).

Approximately 100 grams of the mica pieces and talc powder uniformly dry-blended are dry-blended with 50 kilograms of a transparent polypropylene resin as a resin material and charged into a resin extruder to obtain a cylindrical molten resin. Extrusion blow molding from parison. Mica pieces are scattered around the inner wall surface of the hollow molded article, and each mica piece forms a projection having a height of about 0.2.

In addition, as a solid piece, the maximum length is 0.3
It is also possible to use talc pieces ground to about millimeter to 0.1 millimeter and use talc powder as an additive (filler) to the molding resin material.

Even if only mica pieces are directly blended with the polypropylene resin as the resin material, the mica pieces are unbalanced to one side as described above and do not work. Therefore, first, mica pieces are blended with talc powder, and then blended with a resin material to eliminate bias. In addition, since black mica pieces are blended with the transparent polypropylene resin material, if the mica pieces are biased in the hollow molded product or the thickness of the resin material molded material thickness is not uniform, it is easily formed by blow molding. As can be seen, the mica pieces are uniformly dispersed and mixed. In addition, when the black mica pieces on the inner wall of the hollow molded article and the projections formed thereby are touched visually and by hand, they can be confirmed by a tactile sensation.

As described above, the mica pieces crushed as small solid pieces are used as a condenser having projections formed on the inner wall side by using talc powder as an additive (filler) to the molding resin material to form dew condensation. Water droplets are quickly peeled off from the inner wall of the condenser and dropped downward, and the projections increase the surface area of the inner wall of the condenser, so that a hollow molded article having high heat exchange efficiency can be obtained.

If a molded article containing mica pieces with black opaque milky color is obtained by coloring a polypropylene resin material with an opaque milky white color, the molded article will have an image just like granite, and is usually an imitation of a product made of granite. Products can be applied in design, such as making this type of blow molded product. In this case, mica pieces and a pigment for coloring are first dry-blended, and then dry-blended with a resin material.

According to the manufacturing method as described above, a cylindrical molten resin parison having a plurality of rib-like protrusions formed on the inner wall side by a parison head of a head core having a plurality of cuts formed in a parison extrusion direction. Is extruded and blow-molded, so that a plurality of rib-shaped projections can be easily formed in the parison extrusion direction on the inner wall side of the molded product.

Further, in the parison head, the lower end of the outer peripheral portion of the head core and the lower end of the inner wall of the die, at which the molten resin exits as a parison, are set at substantially horizontal positions. Continue down without being affected. If one lower end extends to a position lower than the other lower end instead of being substantially horizontal,
The formed parison may be deformed under the influence of one extending below the parison.

Further, the tubular molten resin parison contains small solid pieces that do not melt at the resin temperature at the time of molding the molding resin material, and this is blow-molded. The outer surface of the mold is strongly pressed against the inner surface of the mold, and its surface is determined by the inner surface of the mold.However, since the inner wall of the hollow molded product is only blown, the resin material swells up in the portion with small solid material pieces, causing protrusions. In addition, projections are formed on the inner wall side of the hollow molded article. When a hollow molded product having projections formed on the inner wall side is used as the condenser, the water droplets that have condensed are more likely to become round and water droplets on the projections than on the flat inner wall inside the condenser. Peel off quickly and fall down. Also, the surface area as the inner wall of the condenser is increased, and the heat exchange efficiency is improved.

When the maximum length of the small solid piece is larger than the minimum thickness of the hollow molded article, in the worst case, the solid small piece penetrates from the outer surface to the inner wall of the hollow molded article,
There is a possibility that the degree of sealing of the hollow molded article may be poor. Therefore, the maximum length of the small solid piece is made smaller than the minimum thickness of the hollow molded article.

[0073]

The resin heat exchanger according to the present invention can be made smaller, thinner and lighter than the conventional heat exchangers. Further, it is easy to form the heat exchanger into a predetermined shape, and in particular, it can be more easily manufactured by blow molding. Of course, it does not rust and has excellent corrosion resistance, so that an antibacterial agent can be added.

Further, the fluid inside the heat exchanger does not leak and the mounting becomes easy. In particular, when circulating regeneration air in a closed circuit in a dehumidifier equipped with a rotary dehumidifier, the heat exchanger is suitable as a heat exchanger.

Further, since the condensed fluid passage is substantially up and down, the condensed liquid smoothly falls downward.
Further, since the substantially horizontal condensed fluid passage serves as a distribution pipe for dividing the condensed fluid in parallel with the substantially vertically condensed fluid passage, not so many tubes are required, and the cross-sectional area is not so large. The larger one is easier for the condensed fluid to pass through,
In order to cool and condense the fluid to be condensed, the cross-sectional area of the substantially vertically condensed fluid passage is advantageous because heat exchange is easier when the cross-sectional area is smaller.

Further, according to the present invention, since a plurality of rib-shaped projections are formed in the parison pushing direction on the inner wall side of the heat exchanger, water droplets that have condensed inside peel off quickly from the inner wall and fall downward. And the surface area increases,
Heat exchange efficiency is improved.

Further, since a cylindrical molten resin parison having a plurality of rib-shaped projections formed on the inner wall side is extruded and blow-molded by a parison head of a head core having an outer peripheral portion having a plurality of cuts formed in the parison extrusion direction, the molding is performed. A plurality of rib-like projections can be formed in the parison pushing direction on the inner wall side of the article.

Further, in the parison head, the molten resin fed from the resin extruder is extruded from the gap between the outer peripheral portion of the head core and the inner wall of the die to form a cylindrical parison. Since the cut is formed in the outer peripheral portion, the molten resin is strongly pressed by the cut portion of the outer peripheral portion of the head core, so that a protrusion that cuts into the cut portion of the head core is formed on the inner wall of the parison, and this is blow molded, A plurality of rib-like projections can be formed in the parison pushing direction on the inner wall side of the molded product.

Further, the cylindrical molten resin parison contains small solid pieces which are not melted at the resin temperature at the time of molding the molding resin material, and are blow-molded. The resin material swells at a portion of the small piece to form a projection, and a projection is formed on the inner wall side of the heat exchanger. In the heat exchanger in which the projection is formed on the inner wall side, the condensed water droplets are more likely to become round water droplets on the projections than in the case of the flat inner wall, and peel off quickly and fall down from the inner wall. Further, the surface area as the inner wall of the heat exchanger is increased, and the heat exchange efficiency is improved.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a resin heat exchanger according to a first embodiment of the present invention.

FIG. 2 is a front view of the resin heat exchanger according to the first embodiment of the present invention.

FIG. 3 is a sectional view taken along the line AA in FIG. 2 according to the first embodiment of the present invention.

FIG. 4 is a sectional view taken along the line BB of FIG. 2 according to the first embodiment of the present invention.

FIG. 5 is an explanatory view of the entire configuration of a dehumidifier provided with a rotary dehumidifier in which a resin heat exchanger according to the present invention is used.

FIG. 6 is a schematic cross-sectional view for explaining the method for manufacturing the heat exchanger according to the embodiment of the present invention.

7 (a) is a drawing of the parison head of FIG. 6 according to the embodiment of the present invention, as viewed from the direction A, and FIG.
FIG. 3B is an enlarged view of a main part of a cut 59 provided in an outer peripheral portion 58 of the head core 54.

8A and 8B show a plurality of rib-shaped protrusions on the inner wall side of the hollow molded product according to the embodiment of the present invention, wherein FIG. 8A is a partial plan view of the inner wall as viewed from the inside, and FIG. .

[Explanation of symbols]

1, 2 individual condensers (combined condensers are combined) 3 packing 4 metal spring plate material (elastic body) 11, 21 condensed fluid introduction part 12, 22 condensed fluid derivation part 13, 23 condensed liquid discharge part 14 Upper horizontal pipe (substantially horizontal condensed fluid passage pipe) 15 Lower horizontal pipe (substantially horizontal condensed fluid passage pipe) 16 Horizontal pipe (substantially horizontal condensed fluid passage pipe) 17 Substantially vertical condensed pipe Fluid passage tube 18 (for heat exchange fluid passage) space 19 (for fixing) screw hole 51 parison head 52 die 53 resin inlet 54 head core 55 parison 56 split mold 57 nozzle 58 outer peripheral portion of head core 59 cutout 60 rib-shaped protrusion

Claims (5)

[Claims] 1. A hollow hollow body having a plurality of heat exchange fluid passages communicating with each other therein, and having a common heat exchange fluid introduction opening and discharge opening for the heat exchange fluid passages. Resin heat exchanger. 2. The resin heat exchanger according to claim 1, wherein a plurality of vertical rib-like projections are formed on the inner wall side. 3. The resin heat exchanger according to claim 1, which is formed by blow molding. 4. A method for manufacturing a heat exchanger by extruding a tubular parison of a thermoplastic resin and blow molding, comprising extruding a tubular molten resin parison having a plurality of rib-shaped projections formed on an inner wall side thereof. A method for manufacturing a heat exchanger, wherein a plurality of rib-like projections are formed in a parison extrusion direction on the inner wall side of the heat exchanger by molding. 5. A method for manufacturing a heat exchanger by extruding and blow-molding a tubular parison of a thermoplastic resin, the method comprising: adding an additive to the molding resin material such as a pigment or a filler; After blending a small solid piece that does not melt at the resin temperature during molding, blend it with the molding resin material, extrude it from a parison as a cylindrical molten resin and blow-mold it, and on the inner wall side of the molded product, A method for manufacturing a heat exchanger in which protrusions are formed due to the presence of small pieces.