CN102123530A - Hot-water heater and water heater using the same - Google Patents
Hot-water heater and water heater using the same Download PDFInfo
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- CN102123530A CN102123530A CN2010105917362A CN201010591736A CN102123530A CN 102123530 A CN102123530 A CN 102123530A CN 2010105917362 A CN2010105917362 A CN 2010105917362A CN 201010591736 A CN201010591736 A CN 201010591736A CN 102123530 A CN102123530 A CN 102123530A
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Abstract
The invention provides a hot-water heater and a water heater using the same. The hot-water heater is advantaged by simple structure, inhibition corrosion caused by difference of water quality, and higher corrosion resistance. The hot-water heater (8) is provided with heating wires in a heater cylinder (1) and fills insulation powder (4), sealing members (2) are used to perform liquid sealing of the two end openings of the heater cylinder (1), the heater cylinder (1) is provided with a copper pipe (6) at least with a copper surface and a copper tin alloy coating layer (7) covering the surface of the copper pipe (6). Additionally, the water heater using the hot-water heater is also as an object.
Description
Technical field
The present invention relates to be used for the hot-water heater of the hot water in the heating water heater, particularly relate to the hot-water heater of considering corrosion resistance and the water heater that adopts this hot-water heater.
Background technology
As hot-water heater in the past, known have for example patent documentation 1 a described device.
In patent documentation 1, disclose and adopt copper pipe as the heater cylindrical shell and this copper pipe surface is implemented mode, heater cylindrical shell that nickel plating ground constitutes have dual pipe structure and constitute wherein one deck pipe, constitute the wherein mode of another layer pipe by copper by in stainless steel, corrosion-resistant heat-resisting superalloy and the titanium any.
Patent documentation 1: TOHKEMY 2005-235460 communique (invent problem to be solved, the preferred forms that is used to carry out an invention, Fig. 2)
In patent documentation 1, implemented in the mode of nickel plating as the heater cylindrical shell, to copper pipe surface at the employing copper pipe, though copper pipe is at the excellent corrosion resistance that exists under the water quality environment of chloride ion, but the corrosion resistance under acid water quality environment is relatively poor, at this point, the corrosion resistance of utilizing nickel plating to replenish copper pipe.
But, in the hot-water heater of having implemented nickel plating, find following bad.
(1) nickel plating is the coating that is easy to occur pore (pin hole), and when heating in water, meeting produces patina and begins corrosion in the extremely short time, might cause corrosion development by this pore.
(2) nickel dissolving and be easy to cause abnormal response.
(3) price movement of nickel is violent, and cost is higher.
(4) be 8～8.5W/cm for example in watt density
2The time, the surface temperature of water heater reaches about 120 ℃ in water.Copper corrosion electric current density under this temperature is lower than nickel, causes corrosion to develop by leaps and bounds.For fear of this point, the watt density of hot-water heater need be suppressed lower, the total length of the hot-water heater that correspondingly must extend might cause cost to raise.
Like this, though in adopting the hot-water heater of nickel plating, occurred above-mentioned bad, the electro-plating method that replaces of discovery now.
In addition, heater cylindrical shell at patent documentation 1 is in the mode of dual pipe structure, though it is good by any the pipe elevated temperature strength, the oxidative resistance that constitute in stainless steel, corrosion-resistant heat-resisting superalloy and the titanium, but exist under the water quality environment of chloride ion, be easy to take place the local corrosion of stress corrosion cracking (SCC) etc.With respect to this,, comparatively desirable in this because copper pipe at the excellent corrosion resistance that exists under the water quality environment of chloride ion, therefore, as long as adopt this dual pipe structure, just can complement each other the advantage of two kinds of pipes at corrosion resistance.
But, it is imappropriate aspect reducing cost to adopt the tubing of dual system to constitute the way of heater cylindrical shell of dual pipe structure, and, when bending machining heater cylindrical shell, owing to contain the stainless steel of the higher annealing temperature of needs etc., therefore, existing must the such restriction of enforcement The high temperature anneal.
Summary of the invention
That technical task to be solved by this invention provides is simple in structure, suppressed higher hot-water heater of the corrosion resistance of the corrosion that the difference by water quality causes and the water heater that adopts this hot-water heater.
The invention of technical scheme 1 is a kind of hot-water heater, this hot-water heater sets the heating line and fills insulating powder in the heater cylindrical shell, with heater cylindrical shell two-port liquid-tight seal, it is characterized in that the heater cylindrical shell has at least the surface and is copper pipe made of copper and the cu-sn alloy coating that coats this copper pipe surface.
In the hot-water heater of technical scheme 1, the invention of technical scheme 2 is characterised in that, cu-sn alloy coating contains 50～80% copper and 50～20% tin.
In the hot-water heater of technical scheme 1 or 2, the invention of technical scheme 3 is characterised in that cu-sn alloy coating has the thickness of 5～15 μ m.
In each the hot-water heater, the invention of technical scheme 4 is characterised in that cu-sn alloy coating is electroplated to form in the signal bronze electroplate liquid of no cyanogen type in technical scheme 1～3.
The invention of technical scheme 5 is a kind of water heaters, it is characterized in that, the hot-water heater that comprises the hot-water cylinder that contains hot water and be arranged in the technical scheme 1～4 of coming heat hot water in this hot-water cylinder each.
Adopt the invention of technical scheme 1, can provide simple in structure, suppress the higher hot-water heater of corrosion resistance of the corrosion that the difference by water quality causes.
Adopt the invention of technical scheme 2, compare, can provide corrosion resistance better hot-water heater with the situation that does not have this structure.
Adopt the invention of technical scheme 3, the hot-water heater with stable corrosion resistance can be provided.
Adopt the invention of technical scheme 4, can easily make the cu-sn alloy coating of excellent corrosion resistance.
Adopt the invention of technical scheme 5, can easily provide simple in structure, suppress the higher hot-water heater of corrosion resistance of the corrosion that the difference by water quality causes.
Description of drawings
Fig. 1 is the key diagram of the summary of the expression execution mode of using hot-water heater of the present invention.
Among Fig. 2, (a) being the key diagram of unitary construction of the water heater of expression execution mode 1, (b) is the key diagram of the hot-water heater that adopts in the water heater shown in the presentation graphs 2 (a).
(a) is the key diagram of manufacturing process of the hot-water heater of expression execution mode 1 among Fig. 3, (b) is the key diagram of manufacture method of the cu-sn alloy coating of the hot-water heater that adopts in the expression execution mode 1.
Among Fig. 4, (a)～(d) be the key diagram of schematically representing manufacturing process's example of the hot-water heater of employing in the execution mode 1.
Among Fig. 5, (a) being the key diagram of the summary of the hot-water heater that adopts in expression embodiment and the comparative example, (b) is the key diagram of thickness of coating of each one of expression comparative example, (c) is the salt spraytest result's of expression embodiment, comparative example key diagram.
Embodiment
Fig. 1 represents to use the summary of the execution mode of hot-water heater of the present invention.
In the figure, hot-water heater 8 is equipped with heating line 2 in heater cylindrical shell 1, and be filled with insulating powder 4, with the two-port liquid-tight seal of sealed piece 5 with heater cylindrical shell 1, it is copper pipe 6 made of copper, the cu-sn alloy coating 7 that reaches the surface that coats this copper pipe 6 that heater cylindrical shell 1 has surperficial at least.
In this technical scheme, heater cylindrical shell 1 normally has and carries out the tube reducing that tube reducing processes add the mode of the 1a of the Ministry of worker after having filled insulating powder 4, but is not limited to implement the mode of bending machining, also comprises the not mode of the linearity of bending machining.
In addition, the shape of heating line 2 can be in linearity, the U word shape etc. any, is connected with terminal body 3 in the end of this heating line 2, and this terminal body 3 is from the two ends of heater cylindrical shell 1 or an end is drawn out to the outside and can switch on to heating line 2.At this, as terminal body 3, use bar-shaped material usually, but so long as play the materials with function of terminal electrode, by any way can.
And insulating powder 4 insulation coat heating line 2, and play the function to the material of heater cylindrical shell 1 heat conduction, and it is preferably the higher materials of conductive coefficient such as magnesium oxide.Be preferably in addition, this insulating powder 4 can be processed heater cylindrical shell 1 by tube reducing and improve packed density, improves the thermal conductivity between heating line 2 and the heater cylindrical shell 1.
In the present embodiment, heater cylindrical shell 1 with at least the surface for copper pipe 6 made of copper be prerequisite.That is, both can constitute pipe with copper product, also can be that other metallic surfaces are implemented the material that copper facing forms.
At this, under the situation of copper pipe 6,, therefore, can use magnesium oxide as insulating powder 4 because its annealing temperature is lower, as sealing processing, can use the simple and easy sealed piece that constitutes by silica gel and insulating cell as sealed piece 5, comparatively desirable in this.
But copper pipe 6 is at the excellent corrosion resistance that exists under the water quality environment of chloride ion, but the corrosion resistance under acid water quality environment is relatively poor, and therefore, in the present example, cu-sn alloy coating 7 coats copper pipe 6.The corrosion resistance that this cu-sn alloy coating 7 is compared under acid water quality environment with nickel coating is better, and is comparatively desirable in this.
In addition, be 8～8.5W/cm in watt density
2The time, the surface temperature of hot-water heater 8 is about 120 ℃ (about 120 ℃ ± 10 ℃), but the corrosion electric current density of nickel under this temperature is higher than copper, develops by leaps and bounds with respect to the corrosion of nickel coating, cu-sn alloy coating 7 can't be done like this, can suppress the corrosion development effectively.
In addition, in the present example, the copper of cu-sn alloy coating 7 and tin contain proportional can suitably the selection, but preferably contain 50～80% copper and 50～20% tin.
At this, tin is that about 7～20% signal bronze is known as bronze, also contains this bronze in this example.But, consider that from the aspect of corrosion resistance preferred tin is 40～50% signal bronze (speculum-metal), and, contain proportional high more, corrosion resistance good more such aspect consideration from tin, also can select containing of tin proportional more than copper.
And the thickness that is coated in the cu-sn alloy coating 7 on the heater cylindrical shell 1 of hot-water heater 8 for example is that 3～20 μ m get final product, and is preferably about 5～15 μ m.
In addition, manufacture method as cu-sn alloy coating 7, typically use metal complex materials such as cyanogen compound, pyrophosphate, increase the polarization that copper is separated out, desire to make the approaching also bath of eutectoid of deposition potential of copper and tin, but containing under the situation of cyanogen, need make the innoxious drainage treatment equipment of this cyanogen, therefore, consider from simplifying the aspect that is equipped with, preferably the manufacture method of in the signal bronze electroplate liquid of no cyanogen type, electroplating.
In addition, in the present embodiment, be not limited to hot-water heater 8, also will be assembled with the water heater of above-mentioned hot-water heater 8 as object.
Below, the execution mode shown in illustrates in greater detail the present invention with reference to the accompanying drawings.
Fig. 2 (a) expression is assembled with the execution mode 1 of using water heater of the present invention.
In the figure, water heater 50 utilizes jar supporting leg 52 supporting holding vessels 51, connect heat supply water pipe 51a on the top of this holding vessel 51, and at its underpart connection water inlet pipe 51b, in holding vessel 51, also be equipped with hot-water heater 20, and, the water that are stored in the holding vessel 51 are heated at the outer wall stationary heat water heater 20 of holding vessel 51.
In addition, Reference numeral 55 is for holding vessel 51 insulations being covered the insulation material on every side of holding vessel 51.
In the present embodiment, shown in Fig. 2 (b), hot-water heater 20 for example will be inserted at the spiral helicine heating line 22 that two ends are connected with terminal rod 23,24 in the metal tube 21, and, make above-mentioned terminal rod 23,24 be exposed to the outside from the two ends of this metal tube 21, and after in above-mentioned metal tube 21, having filled insulating powder 26, metal tube 21 is implemented tube reducings processing and formed tube reducing and add the 21a of the Ministry of worker, and further implement bending machining and form the 21b of bending machining portion.
In the present embodiment, metal tube 21 is cu-sn alloy coating 32 have been implemented on the surface of copper pipe 31 form.
In the present example, as cu-sn alloy coating 32, adopting containing of copper and tin proportional is 50: 50 material, but is not limited thereto, and also can suitably select.In addition, the thickness of cu-sn alloy coating 32 is set to about 5～15 μ m.
In addition, heating line 22 sets along the axle center of metal tube 21 usually, but is not limited thereto, and also can at random set.
And as insulating powder 26, the preferred preferable material of thermal conductivity for example can use magnesium oxide etc.
And in the present embodiment, the both ends open of metal tube 21 is thickly sealed by sealed piece 28 liquid.At this, sealed piece 28 utilizes and for example seals simply as the silica gel 28a of electro-insulating rubber and the insulating cell 28b that is made of insulators such as aluminium oxide porcelain.
In the present example, because metal tube 21 is to use the mode of copper pipe 31, when carrying out annealing in process along with bending machining etc., annealing temperature is low to 400～500 ℃, therefore, even use the magnesium oxide of sneaking into anti-hygroscopic material (for example silicones) as insulating powder 26, anti-hygroscopic material can not decompose yet when annealing in process.Therefore, handle,, also can use above-mentioned simple sealed piece 28 even if do not use the glass-dead seal part fully to seal as the sealing two ends of metal tube 21.
In addition, in Fig. 2 (b), hot-water heater 20 is inserted in the installing hole 61 of mounting panel 60 for example made of copper, for example utilizes soldering 62 to fix.
Then, according to manufacturing process's example of the hot-water heater 20 of Fig. 3 (a) and Fig. 4 (a)～(d) explanation present embodiment.
Making under the situation of hot-water heater 20, at first, shown in Fig. 4 (a), be formed in the subcomponent 25 that the two ends splicing ear rod 23,24 of heating line 22 forms in advance, above-mentioned subcomponent 25 is inserted integratedly be configured in the metal tube 21 that constitutes by copper pipe.
Then, shown in Fig. 3 (a) and Fig. 4 (b), in metal tube 21, fill insulating powder 26, and, interim bolt (Japanese: 27 (for example electro-insulating rubber, insulating papers) the Provisional bolt) is installed in that terminal rod 23,24 is exposed under the outside state at the two ends of metal tube 21.
Under this state, shown in Fig. 3 (a), form tube reducing and add the 21a of the Ministry of worker (with reference to Fig. 4 (c)) by metal tube 21 being implemented calendering (tube reducing processing).
Then, the middle formed products of the hot-water heater 20 after the tube reducing processing is implemented bending machining, when carrying out this bending machining, shown in Fig. 3 (a), implement process annealing and handle.This process annealing is handled the process annealing temperature (400～500 ℃) that the annealing temperature in the annealing furnace is set at regulation, the middle formed products of hot-water heater 20 is positioned on the conveyer belt that can suitably select transporting velocity carries.
When this process annealing is handled, the middle formed products of hot-water heater 20 is carried out processing at short notice with 400～500 ℃ annealing temperature, therefore, silicones in the insulating powder 26 utilizes its heat melts, make tunicle at mgo surface, the tunicle that should be made of silicones prevents magnesium oxide moisture absorption from the moisture of extraneous air.
Then, shown in Fig. 3 (a), after carrying out bending machining, remove the interim bolt 27 at metal tube 21 two ends, shown in Fig. 4 (d), utilize simple and easy sealed piece 28 (silica gel 28a+ insulating cell 28b) to seal processing.
In addition, the operation that hot-water heater 20 is brazed in mounting panel 60 promptly can simple and easy sealed piece 28 seal processing before carry out, also can carry out after handling above-mentioned sealing.
Shown in Fig. 3 (a), the above-mentioned hot-water heater 20 that seals like that after the processing is treated as finished product through bronze (copper-tin alloy) electroplatings.
At this, for example shown in Fig. 3 (b), in copper facing tin is handled, in electric bath groove 70, store the signal bronze electroplate liquid 71 of no cyanogen type, on anode 72, connect frequency spectrum (spectrum) as signal bronze, and on negative electrode 73, connect as the hot-water heater 20 (having mounting panel 60 in the present example) that is plated object, anode 72, negative electrode 73 are immersed in the signal bronze electroplate liquid 71, by the DC power supply 74 of between anode 72, negative electrode 73, packing into, form cu-sn alloy coating 32 (with reference to Fig. 2 (b)) on the surface of hot-water heater 20 and mounting panel 60.
Like this, because hot-water heater 20 has cu-sn alloy coating 32 on the surface of copper pipe 31, therefore, exist under the water quality environment of chloride ion, all having good anti-corrosion under the acid water quality environment.
Even the dissolving of the part of cu-sn alloy coating 32 also can not cause the such abnormal response of nickel.
Particularly in the present embodiment, as the environment for use of hot-water heater 20, even be 8～8.5W/cm in for example watt density
2The time hot-water heater 20 surface temperature reached 110～130 ℃, compare with nickel plating and also can suppress corrosion development fully.In addition, because the cu-sn alloy coating 32 of hot-water heater 20 film about with 5～15 μ m applies equably, therefore, the corrosion resistance of hot-water heater 20 also seldom produces deviation.
Embodiment
The structure example of Fig. 5 (a) expression hot-water heater unit (hot-water heater+mounting panel) that present embodiment adopted.
In the figure, in the present embodiment, the hot-water heater unit is the mode that is fixed with two hot-water heaters 20 (specifically being 20a, 20b) on mounting panel 60.
And, hot-water heater unit shown in Fig. 5 (a) is implemented in the bronze (copper-tin alloy) electroplating that adopts in the execution mode 1 to be handled, measure the thickness of cu-sn alloy coating 32 at a plurality of measuring points (S (1)～S (7)) of hot-water heater unit, obtained the result shown in Fig. 5 (b).In addition, as a comparative example, in the past Nickel Plating Treatment is implemented in the hot-water heater unit shown in Fig. 5 (a), after measuring the thickness of nickel coating, obtained the result shown in Fig. 5 (b) with the same measuring point of embodiment.
Can confirm that according to Fig. 5 (b) for the thickness mean value of coating, embodiment is 11.1 μ m, comparative example is 14.3 μ m, and for film thickness difference, embodiment is 15.0 μ m, and comparative example is 30.3 μ m, calculates standard deviation interval, and embodiment is 4.6, and comparative example is 9.5.In addition, remark additionally, the thickness of the mensuration position on copper pipe in the cu-sn alloy coating 32, that be formed on hot-water heater 20 31 surfaces (S (2)～S (6)) is in the scope of 5～15 μ m.
Can understand according to this result, the cu-sn alloy coating of embodiment is located covering power (Japanese: pay an I and return り) in the recess of hot-water heater unit and inboard etc. also preferable, compares with comparative example, and embodiment can access uniform film.
And the hot-water heater unit that uses the foregoing description, comparative example carries out salt spraytest as test sample, has obtained the result shown in Fig. 5 (c).
Here said salt spraytest is under the condition of foundation JIS Z2371 test sample to be sprayed.
Can understand according to this figure, compare with comparative example, the corrosion resistance of embodiment is very good.
Description of reference numerals
1, heater cylindrical shell; 1a, subtract the footpath processing department; 2, line with heating function; 3, terminal body; 4, insulation powder; 5, sealed piece; 6, copper pipe; 7, cu-sn alloy coating; 8, hot water heater.
Claims (5)
1. hot-water heater, this hot-water heater sets the heating line and fills insulating powder in the heater cylindrical shell, with heater cylindrical shell two-port liquid-tight seal, it is characterized in that the heater cylindrical shell has at least the surface and is copper pipe made of copper and the cu-sn alloy coating that coats this copper pipe surface.
2. hot-water heater according to claim 1 is characterized in that, cu-sn alloy coating contains 50～80% copper and 50～20% tin.
3. hot-water heater according to claim 1 and 2 is characterized in that cu-sn alloy coating has the thickness of 5～15 μ m.
4. according to each described hot-water heater in the claim 1 to 3, it is characterized in that cu-sn alloy coating is electroplated to form in the signal bronze electroplate liquid of no cyanogen type.
5. a water heater is characterized in that, comprises the hot-water cylinder that contains hot water and is arranged on each described hot-water heater in the claim 1 to 4 of heat hot water in this hot-water cylinder.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010-002917 | 2010-01-08 | ||
| JP2010002917A JP2011142041A (en) | 2010-01-08 | 2010-01-08 | Hot water heater and hot water heater unit using the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102123530A true CN102123530A (en) | 2011-07-13 |
Family
ID=44251933
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105917362A Pending CN102123530A (en) | 2010-01-08 | 2010-12-16 | Hot-water heater and water heater using the same |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2011142041A (en) |
| CN (1) | CN102123530A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102705977A (en) * | 2012-05-30 | 2012-10-03 | 苏州市金翔钛设备有限公司 | Heating device |
| CN103596305A (en) * | 2012-08-13 | 2014-02-19 | 金成根 | Electric heating pipe for heating having corrosion resistance and electric insulation and its producing method |
| CN108353466A (en) * | 2015-07-30 | 2018-07-31 | I.R.C.A.（共同）股份公司工业铠装及类似电阻 | Armouring resistor and its manufacturing process |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59138093A (en) * | 1984-01-11 | 1984-08-08 | 松下電器産業株式会社 | Underwater heater |
| JPH067511B2 (en) * | 1986-10-09 | 1994-01-26 | 豊田合成株式会社 | Heater |
| JP2743416B2 (en) * | 1988-12-01 | 1998-04-22 | 株式会社ユアサコーポレーション | Zinc plate for rechargeable batteries |
| JPH11176560A (en) * | 1997-12-09 | 1999-07-02 | Hitachi Hometec Ltd | Sheathed heater |
| JP2003193287A (en) * | 2001-12-27 | 2003-07-09 | Fujikura Ltd | Electroplating film of tin based alloy |
| JP4458829B2 (en) * | 2003-12-04 | 2010-04-28 | Ｔｏｔｏ株式会社 | Human body cleaning device |
| JP2005235460A (en) * | 2004-02-17 | 2005-09-02 | Sakae:Kk | Sheathed heater, its manufacturing method and heater |
| JP2006012522A (en) * | 2004-06-24 | 2006-01-12 | Mitsubishi Electric Corp | Water heating heater and electric water heater using it |
| JP2008291287A (en) * | 2007-05-22 | 2008-12-04 | Nippon New Chrome Kk | Method for manufacturing copper-tin alloy plated product superior in continual-impact resistance |
-
2010
- 2010-01-08 JP JP2010002917A patent/JP2011142041A/en not_active Ceased
- 2010-12-16 CN CN2010105917362A patent/CN102123530A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102705977A (en) * | 2012-05-30 | 2012-10-03 | 苏州市金翔钛设备有限公司 | Heating device |
| CN103596305A (en) * | 2012-08-13 | 2014-02-19 | 金成根 | Electric heating pipe for heating having corrosion resistance and electric insulation and its producing method |
| CN103596305B (en) * | 2012-08-13 | 2016-03-16 | 金成根 | There is heating electrothermal tube and the manufacture method thereof of corrosion resistance and insulating properties |
| CN108353466A (en) * | 2015-07-30 | 2018-07-31 | I.R.C.A.（共同）股份公司工业铠装及类似电阻 | Armouring resistor and its manufacturing process |
| US10743374B2 (en) | 2015-07-30 | 2020-08-11 | I.R.C.A. S.P.A. Industria Resistenze Corazzate E Affini | Armored resistor and manufacturing process thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2011142041A (en) | 2011-07-21 |
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Application publication date: 20110713 |