JP4559653B2 - Exhaust member for heat source machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an exhaust member for a heat source machine useful as a member constituting an exhaust part of a heat source machine such as a water heater.
[0002]
[Prior art]
In homes and offices, many heat source machines using gas and electricity, for example, water heaters and air conditioners are used. A heat source machine that uses gas in this heat source machine usually includes an intake port, a gas combustion unit including a heat exchanger through which tap water and the like can be circulated, and an exhaust port for discharging the burned exhaust gas. The exhaust from the combustion unit is performed using an exhaust member that communicates with the exhaust port. The exhaust member is usually attached to an exhaust pipe disposed near the combustion unit, an exhaust pipe for guiding exhaust gas from the exhaust pipe, an end of the exhaust pipe, and the exhaust And an exhaust top provided with an exhaust port for discharging to the exhaust.
[0003]
As such an exhaust member for a heat source machine, a metal (such as stainless steel such as SUS304) is used from the viewpoints of heat resistance and incombustibility. However, in such a metal exhaust member, improvement in mass productivity and workability is a major issue. In particular, the exhaust top includes a plurality of members, for example, a cylindrical mounting member for mounting on the exhaust cylinder, and a net-like or net-like member attached to the cylindrical mounting member and forming an exhaust port. It consists of This complicates work and processing for attaching the net or net member tightly and integrally to the metal cylindrical mounting member. Further, since the metal member is corroded by dew condensation or exhaust gas drainage, in order to prevent corrosion, it is necessary to apply combustion control for setting the exhaust temperature to be higher than the dew point or to apply corrosion resistant coating to the corroded portion. Therefore, design for combustion control and processing of the exhaust member are necessary, and it is difficult to efficiently process the exhaust member.
[0004]
[Problems to be solved by the invention]
Accordingly, an object of the present invention is to provide an exhaust member for a heat source machine that has high workability and mass productivity, and is highly integrated even if it is composed of a plurality of members.
[0005]
Another object of the present invention is to provide an exhaust member for a heat source machine that does not have the risk of corrosion without being subjected to a corrosion-resistant coating, and that can simplify the design for combustion control and the processing of the exhaust part.
[0006]
[Means for Solving the Problems]
As a result of intensive studies to achieve the above problems, the inventors of the present invention not only show high resistance to exhaust heat from a heat source, but also high when an exhaust member is formed using a specific resin or resin composition. It has been found that the productivity and mass productivity can be improved by workability, and that high heat resistance can be imparted to the exhaust heat member, that not only the exhaust member can be reduced in weight, but also that noise generation can be suppressed even when applied to the exhaust top. Was completed.
[0007]
That is, the exhaust top of the present invention constitutes an exhaust passage for exhausting gas from the heat source of the feed water heater, the heater or the heat exchanger, and the cylindrical mounting member and the cylindrical mounting member a top exhaust gas is composed of a integrated ventilation member, at least the cylindrical mounting member, and a molded product of the thermal decomposition temperature of 1 80 ° C. or more phenolic resins. The molded body may contain a reinforcing agent (for example, a fibrous reinforcing agent and / or a granular reinforcing agent), particularly at least an inorganic reinforcing agent (such as a fibrous inorganic reinforcing agent) .
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The thermoplastic resin constituting the exhaust member for a heat source apparatus of the present invention has a glass transition temperature (glass transition temperature by differential scanning calorimeter DSC) of 180 ° C. or higher (eg, 190 to 350 ° C., preferably about 200 to 350 ° C.). ). As such a thermoplastic resin, for example, an aromatic polyester resin (polyarylate resin, 9,9-bis (4- (2-hydroxyethoxy) phenyl) fluorene having a fluorenone side chain as a diol component) Resin, liquid crystalline polyester resin composed of wholly aromatic polyester, etc.), aromatic polyamide resin, polysulfone resin (polyethersulfone, polysulfone, etc.), polyphenylene ether resin (polymer of 2,6-xylenol) Etc.), polyarylene sulfide resins (polyphenylene sulfide sulfone, polybiphenylene sulfide, etc.), thermoplastic polyimide resins (polyetherimide resin, polyamideimide resin, polyimide sulfone resin, etc.), polyparabanic acid and the like. These resins can be used alone or in combination of two or more.
[0009]
Among these resins, polyarylate resins, aromatic polyester resins containing 9,9-bis (4- (2-hydroxyethoxy) phenyl) fluorene as a diol component, wholly aromatic liquid crystalline polyester resins, aromatics Polyamide resins, polysulfone resins, polyphenylene ether resins, polyarylene sulfide resins, thermoplastic polyimide resins, polyparabanic acid, and the like have high glass transition temperatures and heat resistance. In particular, wholly aromatic liquid crystalline polyester resins, polyether sulfones, polyphenylene ether resins, thermoplastic polyimide resins, and polyparabanic acids have high glass transition temperatures and heat resistance.
[0010]
The thermosetting resin is a resin having a thermal decomposition temperature (a weight reduction starting temperature or a differential thermal decomposition starting temperature in thermogravimetric analysis TGA) of 180 ° C. or higher (for example, about 200 to 500 ° C., preferably about 200 to 500 ° C.). There are no particular restrictions, for example, phenol resin, amino resin (urea resin, guanamine resin, melamine resin, etc.), epoxy resin (glycidyl ether type epoxy resin such as bisphenol A type, novolac type epoxy resin, glycidyl amine type epoxy resin) Etc.), vinyl ester resins, diallyl phthalate resins, unsaturated polyester resins, polyurethane resins (aromatic polyisocyanates or polyisocyanates (such as polyisocyanates having an isocyanurate ring)), aromatic polyols, and aromatic polyesters Polyol And / or aromatic polyamines obtained by reaction with aromatic polyamines), polyimide resins (condensation type polyimide resins produced by condensation reaction of aromatic tetracarboxylic acids and aromatic diamines, bismaleimides and aromatic diamines) Examples thereof include addition-type polyimide resins such as bismaleimide-based resins produced by the reaction with silicone, and silicone resins. These resins can be used alone or in combination of two or more, and may be a copolymer. For example, co-condensates of phenols with co-condensation components (urea, melamine, furfural, etc.), aromatic polyisocyanates or polyisocyanates (polyisocyanates having an isocyanurate ring), and epoxy resins (bisphenol A type) A copolymer of aromatic epoxy resin and the like) and an aromatic polyamine can be used as the copolymer. For curing the thermosetting resin, a conventional curing agent according to the type of resin can be used.
[0011]
Examples of thermosetting resins with high heat resistance include phenol resins (including co-condensed phenol resins), aromatic epoxy resins, vinyl ester resins, aromatic polyurethane resins, polyimide resins, and the like.
[0012]
A preferable thermosetting resin is a phenol resin having a high mechanical strength retention at a high temperature. The phenol resin may be a resol type phenol resin or a novolac type phenol resin. The phenol resin can be obtained by reacting phenols (for example, phenol, cresols, alkylphenols, aminophenols, etc.) and aldehydes (formaldehyde) in the presence of an acid catalyst or a basic catalyst.
[0013]
The exhaust member may be composed of a polymer alloy composed of a plurality of resins, and this polymer alloy is not limited to thermoplastic resins and thermosetting resins, but a combination of a thermoplastic resin and a thermosetting resin. It may be formed. Furthermore, if necessary, the polymer alloy may contain a compatibilizing agent.
[0014]
The molded body may be formed of a resin alone, but in order to improve heat resistance (thermal deformation temperature, thermal decomposition temperature, etc.), mechanical properties, etc., it is formed of a resin composition containing a reinforcing agent. preferable. The reinforcing agent may be a fibrous reinforcing agent or a granular reinforcing agent. Examples of fibrous reinforcing agents include inorganic fibers (glass fibers, carbon fibers, alumina fibers, silica fibers, boron fibers, metal fibers, whiskers, etc.), organic fibers (natural fibers such as pulp, semi-synthetic fibers, aramid fibers, Examples thereof include synthetic fibers such as rayon. Examples of the particulate reinforcing agent include silica, alumina, titanium oxide, shirasu balloon, mica, talc, calcium carbonate, barium sulfate and the like. These reinforcing agents can be used alone or in combination of two or more (two or more of the same or different reinforcing agents). As these reinforcing agents, it is preferable to use at least an inorganic reinforcing agent (particularly, a fibrous reinforcing agent such as a fibrous inorganic reinforcing agent). Furthermore, the reinforcing agent is preferably a flame retardant reinforcing agent.
[0015]
In addition, resin and a reinforcing agent can be combined according to the kind of resin and a reinforcing agent, for example, it is comprised combining phenol resin and fibrous reinforcing agents (for example, fibrous inorganic reinforcing agents, such as glass fiber). May be.
[0016]
The average fiber diameter of the fibrous reinforcing agent is, for example, 1 to 30 μm, preferably about 2 to 20 μm, and the average aspect ratio is, for example, about 10 to 10000, preferably about 10 to 1000 (for example, 50 to 500). is there. The average particle diameter of the granular reinforcing agent can be appropriately selected from a range of, for example, about 1 to 50 μm, preferably about 1 to 30 μm.
[0017]
The content of the reinforcing agent is not particularly limited as long as the mechanical properties of the molded article are not impaired. For example, 1 to 300 parts by weight, preferably 5 to 250 parts by weight, and more preferably 10 to 10 parts by weight with respect to 100 parts by weight of the resin. It may be about 200 parts by weight.
[0018]
Furthermore, the exhaust member may contain a flame retardant. Examples of flame retardants include halogen flame retardants (brominated epoxy resins, brominated polycarbonate resins, etc.), combinations of halogen flame retardants and antimony oxide, phosphate ester flame retardants (tricresyl phosphate, tris (dibromo) (Propyl) phosphate, condensed phosphate ester, etc.). These flame retardants can also be used alone or in combination of two or more. The amount of the flame retardant used can be appropriately selected from the range of, for example, about 1 to 30 parts by weight, preferably about 2 to 25 parts by weight with respect to 100 parts by weight of the resin.
[0019]
Furthermore, if necessary, various additives such as stabilizers (antioxidants, ultraviolet absorbers, heat stabilizers, etc.), colorants, antistatic agents and the like may be added to the resin composition.
[0020]
The exhaust member of the present invention can be composed of a molded body obtained by molding the resin or resin composition into a predetermined shape. The exhaust member includes various members as long as an exhaust path for exhausting exhaust gas (hot gas) from a heat source (such as a combustion unit) is configured. Therefore, the exhaust member only needs to have a predetermined form according to the form of the exhaust path, the application site, and the like. Typical exhaust members include, for example, an exhaust pipe, an exhaust pipe, an exhaust top, and the like, and at least one member may be formed of the molded body. Since such an exhaust member can be formed by molding the resin or the resin composition, mass productivity and workability can be greatly improved. In addition, since there is no risk of corrosion due to condensation or exhaust gas drainage, combustion control, corrosion-resistant coating, and the like are unnecessary, and the design of the heat source machine and the processing of the molded body can be greatly improved.
[0021]
In the exhaust member for exhausting the exhaust gas from the heat source (particularly the combustion unit), the exhaust pipe is usually disposed in the vicinity of the combustion unit including a heat exchanger, and the exhaust pipe is connected to the exhaust pipe. Connected in communication and used to guide exhaust gas to the exhaust top. Further, the exhaust top is attached to an end of the exhaust cylinder and has an exhaust port for discharging the exhaust gas to the outside.
[0022]
FIG. 1 is a schematic view showing an exhaust top. The exhaust top 1 includes a cylindrical mounting member 2 that can be mounted on the end of the exhaust tube, and a ventilation member 3 that is integrated with the cylindrical mounting member. The cylindrical mounting member 2 may be formed integrally with the ventilation member 3. Moreover, the said ventilation member 3 may be a flat plate shape, and may bulge and curve toward outward. The ventilation member 3 is formed in the opening of the cylindrical mounting member, thereby preventing birds and the like from entering the exhaust member and controlling the combustion by controlling the exhaust amount. The mounting member 2 is formed with a long hole 4 for positioning and fixing with respect to the exhaust pipe using screwing or the like.
[0023]
In this example, the cylindrical mounting member 2 and the ventilation member 3 are formed of the resin or the resin composition. By forming the ventilation member 3 with a resin or a resin composition, the molding process is facilitated, and it is easy to form the shape of the opening into a desired shape (round shape, polygonal shape, lattice shape, etc.). The exhaust noise can be reduced by the exhaust control by controlling the opening diameter or the directionality of the exhaust.
[0024]
In such an exhaust member, even if the exhaust top 1 is composed of a plurality of members (a cylindrical mounting member and a ventilation member), the cylindrical mounting member 2 and the ventilation member 3 can be integrally molded, and only if it is workable. The unity can be greatly improved. Therefore, even if wind acts on the ventilation portion, the ventilation member does not vibrate with respect to the tubular mounting member, and the generation of noise can be greatly suppressed.
[0025]
If necessary, a plurality of members constituting the exhaust path [exhaust pipes, exhaust cylinders and exhaust tops (such as cylindrical mounting members)] are closely attached to a plurality of adjacent or connected positions. Alternatively, a connectable mounting end portion may be formed, and a plurality of members at adjacent or articulated positions may be integrally formed with each other.
[0026]
The ventilation member (such as a mesh-like ventilation member) may have an appropriate ventilation form such as a lattice shape, and the shape of the ventilation hole is not particularly limited. In the above example, among the exhaust top, the cylindrical mounting member and the ventilation member are formed of the resin or the resin composition. However, if necessary, either the cylindrical mounting member or the ventilation member is used. You may shape | mold with resin or a resin composition. Further, the ventilation member may be mounted (particularly tightly mounted) on the tubular mounting member by various methods such as fitting and insertion, or may be integrally formed as described above. Further, the ventilation member (mesh-like ventilation member) may be a mesh-like or net-like member, such as a net-like body such as glass fiber, carbon fiber or metal fiber, a metal plate-like body such as punching metal, ceramics, or the like. It may be formed.
[0027]
A heat reflecting layer (for example, a metal thin film such as an aluminum foil) may be formed or laminated on the inner surface of the exhaust member.
[0028]
The exhaust member of the present invention includes various heat source machines, for example, a preheater and a heater (for example, a heating object (water, air, etc.) directly or indirectly by a heat exchange unit by combustion gas or electric heating (for example, It can be applied to water heaters such as water heaters, heaters, and heat exchangers.
[0029]
【The invention's effect】
In the present invention, for configuring an exhaust member of the heat source machines in particular resin molding processability and high mass productivity, be constituted by a member of a multiple can be improved integrity. Moreover, since there is no possibility of corrosion even if the anti-corrosion coating is not applied, the design for the combustion part and the combustion control can be simplified, and the processing efficiency of the exhaust part can be improved.
[0030]
【Example】
Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited to these examples.
[0031]
Example 1
A resin composition was prepared by kneading 50 parts by weight of a novolac type phenolic resin and 50 parts by weight of glass fiber. The specific gravity of the obtained resin composition was 1.8. The heat source machine exhaust member was molded with a mold having a hollow mounting member of the exhaust top and a cavity corresponding to the ventilation member, and annealed at 400 ° C. for 2 hours to produce a molded product (exhaust top). Using the resin composition, JIS standard bending test specimens were produced under the same conditions.
[0032]
As a heat resistance test, the test piece for bending test was held in air at 220 ° C. for 200 hours, and the appearance change, weight change, and strength change were evaluated. In the visual appearance inspection, changes were observed before and after the test. There wasn't. Further, the rate of change in weight was less than 1% by weight, the rate of change in maximum point stress, elongation at break, and elastic modulus in the bending strength test was also less than 1%, and no deterioration was observed. As a touch resistance test, the test piece was subjected to a salt spray test at 35 ° C. and 500 hours, and then the appearance of the test piece was visually inspected. As a result, deterioration such as swelling and cracking was not observed.
[0033]
The molded product (exhaust top) was subjected to a heat resistance test and a touch resistance test. In the heat resistance test, after placing the exhaust top in an electric furnace and holding it in air at 220 ° C. for 200 hours, the appearance change and the weight change were evaluated. No change was observed, and the weight change rate before and after the test was less than 1% by weight. Further, a salt spray test was conducted at 35 ° C. for 500 hours, and the contact resistance was examined. As a result of visual inspection of the appearance, no swelling or cracking was observed.
[0034]
Comparative Example 1
A test piece was prepared using stainless steel (SUS304), a salt spray test was conducted at 35 ° C. for 500 hours, and the appearance of the test piece was visually inspected. .
[Brief description of the drawings]
FIG. 1 is a schematic view showing an example of an exhaust member (exhaust top).
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Exhaust top 2 ... Cylindrical mounting member 3 ... Ventilation member

Claims (4)

The exhaust passage for exhausting the gas from the heat source of the feed water heater, the heater or the heat exchanger is configured, and is configured by a cylindrical mounting member and a ventilation member integrated with the cylindrical mounting member. and a exhaust top, at least the cylindrical mounting member, the top exhaust gas is composed of molded product of the pyrolysis temperature of 1 80 ° C. or more phenolic resins. The exhaust top according to claim 1, wherein the molded body contains at least an inorganic reinforcing agent. The exhaust top according to claim 2, wherein the reinforcing agent is at least one selected from a fibrous reinforcing agent and a granular reinforcing agent. The exhaust top according to claim 2, wherein the reinforcing agent is a fibrous inorganic reinforcing agent.

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