JP2019085583A - Net resin molding - Google Patents

Abstract

To provide a resin molding which charges and controls air introduced into a heat exchanger and can enhance heat exchange efficiency in the heat exchanger.SOLUTION: A net resin molding has a plate shape formed of a thermoplastic resin, and has a ventilation hole penetrating in a thickness direction and passes air through the ventilation hole to introduce the air into a heat exchanger. The net resin molding is formed of a thermoplastic resin of polyethylene or polypropylene obtained by dissolving non-fired powder of montmorillonite clay mineral.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a resin molded product capable of enhancing the heat exchange efficiency in a heat exchanger, and more particularly to a reticulated resin for use in an air conditioner capable of controlling the charge of air introduced into the heat exchanger and improving the heat exchange efficiency in the heat exchanger. It relates to a molded body.

  There have been attempts to improve the operating efficiency of an air conditioner including the same by increasing the heat exchange efficiency in the heat exchanger. Among these attempts, in the heat exchanger (condenser) of the outdoor unit of the air conditioner for cooling the heated circulating refrigerant, water is sprayed on the heat exchanger and evaporated (vaporized), and heat of heat is generated by this heat of vaporization. Many methods have been proposed to assist heat removal on the exchanger surface.

  On the other hand, Patent Document 1 discloses a method of reducing the temperature of the wind sent to the heat exchanger (condenser) of the outdoor unit of the air conditioner using the heat of vaporization of water. A honeycomb porous body is provided, which is formed on the upstream side of a condenser fan and in which a plurality of relatively large vent holes penetrating in a direction along the flow of the wind of the fan and which is made of a ceramic plate containing fine pores. While the temperature of the wind to the condenser fan is lowered with a small amount of water by the water held in the pores being vaporized, the pressure loss of the wind is kept small by giving a relatively large vent hole, as a result, It is said that the heat exchange efficiency in the heat exchanger can be enhanced.

  Further, in Patent Document 2, in a heat exchanger of an air conditioner having a flow system of air, a composite material of a sintered ceramic powder + resin which is given to the flow path of air and changes the temperature of the air flow passing through it. Discloses a plate-like reticulated resin molded product. This reticulated resin molded product is also a plate-like resin molded product having a thickness of about 2 to 3 mm having relatively large vent holes for suppressing the pressure loss of air as in Patent Document 1, but it is fired at low temperature together with glaze. The heat exchange efficiency in the heat exchanger can be enhanced by incorporating about 20% of the powder obtained by crushing the obtained fired ceramic in a matrix resin such as polyethylene.

  By the way, in recent years, the charged state of electric charge in a pipe or the like that forms the flow path of air to the heat exchanger affects the flow state of air passing therethrough, and as a result, to the heat conversion efficiency in the heat exchanger. It has been found to have an impact.

  For example, Patent Document 3 discloses a method of enhancing cooling efficiency by installing a self-discharge type static eliminator for suppressing positive charge from being charged on a fan cover made of a nonconductive synthetic resin material in a cooling device for an automobile. doing. As the voltage value on the surface of the non-conductive thin wall increases, the flow of air along this surface changes, the air flow tends to separate from the surface of the thin wall, and the cooling efficiency of the cooling device decreases. . In order to suppress this and control the air flow, a self-discharge type static eliminator is installed.

JP 2012-72951 A JP, 2014-224621, A JP, 2016-117388, A

  Even if the indoor unit of the air conditioner sucks the air in the room and exchanges heat with a heat exchanger and then returns it to the room, it is general that the cosmetic (front) panel or the like directed to the room is made of resin. Because of this, as in Patent Document 3, the problem of charging may occur. In this respect, although the resin molded body of Patent Document 2 is not specified, if it has a function to cancel the charged state, the turbulent air flow is controlled to the original ideal flow state, and as a result, It can also be understood that the operating efficiency of the air conditioner is enhanced.

  The present invention has been made in view of the above situation, and the object of the present invention is to control the charge of air introduced into a heat exchanger and to improve the heat exchange efficiency in the heat exchanger. It is in providing a molded object.

  The present inventors focused not only on the physical properties given to the air flow of the fired ceramic powder given to the resin molded body as in Patent Document 2, but rather on the resin. That is, the air flow in the thickness direction of the resin molded product having a thickness of about 2 to 3 mm at a height only contains several tens of% or more of sintered ceramic powder from such a short air flow path. It is hard to believe that the resin is greatly affected by the physical properties of the fired ceramic powder that has been exposed to the surface of the air flow path of the resin. On the other hand, it is not practical to apply a large amount of sintered ceramic powder to a resin molded body in order to enhance the influence of the physical properties of the sintered ceramic powder, which makes it impossible to mold the resin. The present invention has been achieved as a result of trial and error in such a situation.

  That is, the reticulated resin molded product according to the present invention is a reticulated resin molded product which is a plate made of a thermoplastic resin, has a vent hole penetrating in the thickness direction, and passes this to introduce air into the heat exchanger. It is characterized in that it is made of polyethylene or polypropylene thermoplastic resin in which unbaked powder of montmorillonite clay mineral is dissolved.

  According to such a reticulated resin molded product, by using this, it is possible to charge-control the air introduced into the heat exchanger and to improve the heat exchange efficiency in the heat exchanger.

  In the invention described above, when one main surface is set to the ground potential, the other main surface may be set to a negative potential. According to such a reticulated resin molded product, by using this, it is possible to reliably charge-control the air introduced into the heat exchanger and to improve the heat exchange efficiency in the heat exchanger.

In the above invention, the clay mineral may be contained in a range of 2 to 5% by mass ratio with respect to the thermoplastic resin. Further, the non-fired powder may be a crushed mudstone. Furthermore, the mudstone may be characterized by containing at least 60 to 70 wt% of SiO ₂ and 10 to 15 wt% of Al ₂ O ₃ in a mass ratio. According to such a reticulated resin molded product, by using this, it is possible to reliably charge-control the air introduced into the heat exchanger and to improve the heat exchange efficiency in the heat exchanger.

  In the above invention, the planar aperture ratio of the ventilating hole may be 70% or more. According to such a reticulated resin molded product, by using this, the flow of the air introduced into the heat exchanger is not impeded, while the charge control can be performed even if the contact area with the air passing through this is reduced. The heat exchange efficiency in the heat exchanger can be enhanced.

FIG. 1 is a cross-sectional view of an air conditioner used in one embodiment according to the present invention. They are (a) front view and (b) side view of a reticulated resin molding. It is a flowchart which shows the manufacturing method of a reticulated resin molding. It is a table | surface of the electric potential measurement result of a reticulated resin molding. It is sectional drawing which shows the example of arrangement | positioning of a reticulated resin molding.

  A method of operating an air conditioner according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

  As shown in FIG. 1, the air conditioner 10 includes a grill 1 attached to an air suction port, a filter 2, a reticulated resin molded body 3, and a heat exchanger 4 sequentially disposed in an air flow path 5. . In particular, the reticulated resin molded body 3 is disposed so as to cross the air flow path 5 to the heat exchanger 4. Here, except for the reticulated resin molded body 3, since it is the same as a known air conditioner, the description is omitted.

  Referring also to FIG. 2, the reticulated resin molded body 3 is made of a thermoplastic resin of polyethylene (hereinafter referred to as PE) or polypropylene (hereinafter referred to as PP) in which unfired powder of montmorillonite clay mineral is dissolved. It is a plate-like body having a large number of circular vent holes 31 penetrating in the thickness direction. Further, the reticulated resin molded body 3 may be appropriately provided with a blind portion 32 and a crosspiece 33 in which the vent holes 31 are not provided. In the present embodiment, blind portions 32 are provided at the four corners, and crosspieces 33 are provided at the center in the vertical and horizontal directions, respectively. Further, through holes (not shown) may be provided in the crosspieces 33 as appropriate as long as the strength of the crosspieces 33 is not impaired.

  Here, when the air conditioner 10 is operated, air is drawn into the air flow path 5 from the suction port by the fan not shown, passes through the grille 1 and the filter 2 respectively, and passes through the reticulated resin molded body 3 before heat exchange. It is introduced into the vessel 4 and exchanges heat with the medium inside the heat exchanger 4 such as fins.

  In the air conditioner 10, it is known that the heat exchange efficiency can be improved by arranging the reticulated resin molded body 3 so as to cross the air flow path 5 to the heat exchanger 4. Although the details of the mechanism are unknown, it is considered that the charge control of the air introduced into the heat exchanger 4 can be performed by the reticulated resin molded body 3 as follows.

  For example, grills and filters are generally made of non-conductive materials and tend to be positively charged as the air conditioner operates. When air passes through a positively charged grille or filter, as described in Patent Document 3, the air is positively charged to form a flow different from that originally intended, and as a result, It reduces the heat exchange efficiency in the heat exchanger.

  On the other hand, the reticulated resin molded body 3 is a resin in which a clay mineral is dissolved, and it has been confirmed that it is easy to obtain a negative potential stably and to alleviate the charged state of positively charged air. It is considered that charging control is performed. As a result, it is considered that the flow of air can be brought close to what was originally intended, and the heat exchange efficiency reduced by the positive charging of the air can be improved to approach the original heat exchange efficiency.

  Here, it is preferable that the vent holes 31 of the reticulated resin molded body 3 do not obstruct the flow of the air introduced into the heat exchanger 4 when the planar aperture ratio is 70% or more. The vent holes 31 may be hexagonal instead of circular in plan view.

  A method of manufacturing such a reticulated resin molded body 3 will be described with reference to FIG.

  As shown in FIG. 3, a reticulated resin molded body 3 made of a thermoplastic resin in which a clay mineral is dissolved can be obtained, for example, by injection molding. Specifically, first, a mudstone containing uncalcined montmorillonite clay mineral is crushed by a crusher to an average particle size of, for example, 5 to 10 μm to obtain a powder, and mixed with PE or PP at a predetermined ratio. Produce mudstone pellets containing clay minerals (S1). Next, a resin pellet made of either PE or PP used in the preparation of the mudstone and the mudstone pellet are blended at a predetermined ratio to obtain a mixed pellet (S2). The mixed pellet is put into an injection molding machine, and while melting the resin in the injection molding machine, clay mineral powder is mixed with the resin and injected into the mold of the reticulated resin molded body 3 and molded (S3) . Thus, by obtaining the reticulated resin molded body 3, the thermoplastic resin forming the reticulated resin molded body 3 can contain and contain a clay mineral. By dissolving the clay mineral in this manner, charge control of air can be performed on the entire surface of the reticulated resin molded body 3. That is, it is intended that the clay mineral is dissolved in the resin to change the properties of the resin, rather than simply dispersing the clay mineral particles in the resin.

  The thermoplastic resin forming the reticulated resin molded body 3 has a small effect of controlling the charge of air when the amount of clay mineral contained is small, and the effect of the charge control is saturated when the amount of the clay mineral is large, and the reticulated resin molded body Molding of 3 becomes difficult. It is preferable that the clay mineral is contained in an amount of 2 to 10% by mass ratio to the whole thermoplastic resin, and more preferably, 2 to 5%.

In addition, montmorillonite has a chemical composition of (Na, Ca) _0.33 (Al, Mg) ₂ Si ₄ O ₁₀ (OH) ₂ .nH ₂ O, but mudstone containing montmorillonite clay mineral is SiO ₂ or Al _As well as containing a large amount of ₂ O ₃ as a main oxide, oxides such as Na ₂ O, MgO, SO ₃ , K ₂ O, CaO, TiO ₂ and FeO are also contained in others. Here, the mudstone for obtaining the montmorillonite clay mineral as described above preferably contains at least 60 to 70 wt% of SiO ₂ and 10 to 15 wt% of Al ₂ O ₃ in mass ratio. Such a component composition contains a large amount of montmorillonite, and the effect of controlling the charge of air can be surely obtained.

  Since the potential measurement of such a reticulated resin molded body 3 was performed, the result will be described with reference to FIG.

  First, a portion around one air hole 31 of one reticulated resin molded body 3 manufactured by incorporating 10% of montmorillonite clay mineral by mass ratio using PE as a resin is cut out in a substantially annular shape, and this annular body is It was a test piece. The test piece is placed on the ground electrode made of a copper plate, the lower main surface is set to the ground potential, and the electric potential on the upper surface which is the opposite main surface is upper and lower two places in top view The measurement was made at two places facing horizontally in the above, and then turned upside down and measured at two places in the same manner. The measurement results are shown in FIG. 4 "Example". For measurement, a surface electrometer (Isoprobe-model 244) manufactured by Monroe Electronics Co., Ltd. and its probe (model 1017) were used. Moreover, as a "comparative example", the annular body was similarly cut out from the molded object which consists only of PE of the same shape as the reticulated resin molded object 3, the electric potential was similarly measured, and it showed in FIG.

  As shown in FIG. 4, in the “embodiment”, a negative potential is stably shown on the main surface on the opposite side to the ground potential of one main surface. On the other hand, the "comparative example" is unstable such as partially including a positive potential. In addition, the average value of the total of four potentials is also larger in the “example” as a negative potential. That is, according to the “example” in which the clay mineral is dissolved and contained, when one main surface is set to the ground potential, the other main surface stably has a negative potential. That is, according to the reticulated resin molding 3 of the embodiment, the charge control can be performed so as to alleviate the charged state of the positively charged air.

  In general, clay minerals are negatively charged and have cation exchange ability, but montmorillonite clay minerals have a relatively large cation exchange capacity, thereby stably bringing network resin molding 3 to a negative potential. It can be considered that Moreover, it is thought that it can be finely dispersed and dissolved inside the thermoplastic resin because it is an unbaked body. This is because when the ceramic powder which is a sintered body is dispersed, the light transmission is lost regardless of PE or PP, but the reticulated resin molded body 3 in which the unfired powder of the clay mineral is dissolved transmits the light. It is because it does not lose sex.

  The specific arrangement of the reticulated resin molded body 3 as described above in the air conditioner will be described with reference to FIG.

  As shown in FIG. 5, the air conditioner 20 is a ceiling-embedded indoor unit. The main body 21 is embedded in the ceiling 11 and is provided therein with a motor 22 and a fan 23 rotated by the motor 22. Due to the rotation of the fan 23, air is sucked from the lower room through the suction port 12 at the lower center of the main body 21, introduced into the heat exchanger 4 on the outer peripheral side and heat exchanged, and the outlet 13 on the outer peripheral side It is returned to the room from. Here, the grille 1 and the filter 2 are inserted in order from the bottom into the suction port 12, and the reticulated resin molded body 3 is disposed above it so as to cross the air flow path toward the heat exchanger 4.

  With such an arrangement, even if the sucked air is positively charged by the grille 1 or the filter 2, the reticulated resin molded body 3 disposed between the grille 1 or the filter 2 and the heat exchanger 4 can be used. The charge can be controlled so as to ease the charged state of the positively charged air by passing it.

  In addition, even in the case of a charged dust collection filter that positively charges air passing through the filter 2, since the reticulated resin molded body 3 is disposed between the filter 2 and the heat exchanger 4, the charged state of positively charged air is Charge control can be done to ease the

  Further, by arranging the reticulated resin molded body 3 so as to cross the air flow path to the heat exchanger of the air conditioner, even if it is another type of air conditioner, it is either an indoor unit or an outdoor unit. However, the heat exchange efficiency can be improved.

  As mentioned above, although the Example by this invention and the modification based on this were demonstrated, this invention is not necessarily limited to these examples. Also, one of ordinary skill in the art would be able to find various alternative embodiments and modifications without departing from the spirit of the present invention or the appended claims.

3 reticulated resin molding 4 heat exchanger 5 air flow path 10, 20 air conditioner

Claims (6)

A reticulated resin molded product which is a plate made of a thermoplastic resin, has a vent hole penetrating in the thickness direction, and passes the air to introduce the air into the heat exchanger.
A reticulated resin molded article comprising a thermoplastic resin of polyethylene or polypropylene in which unfired powder of montmorillonite clay mineral is dissolved.   2. The reticulated resin molded product according to claim 1, wherein when the one main surface is at the ground potential, the other main surface has a negative potential.   The reticulated resin molded product according to claim 2, wherein the clay mineral is contained in a range of 2 to 5% with respect to the thermoplastic resin in a mass ratio.   The reticulated resin molded product according to claim 3, wherein the unfired powder is obtained by crushing mudstone. The reticulated resin molded product according to claim 4, wherein the mudstone contains at least 60 to 70 wt% of SiO ₂ and 10 to 15 wt% of Al ₂ O ₃ in mass ratio. The reticulated resin molded product according to any one of claims 1 to 5, wherein a planar opening ratio of the vent holes is 70% or more.

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