CN203404974U - Heat exchanger of gas water heater and gas water heater - Google Patents
Heat exchanger of gas water heater and gas water heater Download PDFInfo
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- CN203404974U CN203404974U CN201320411730.1U CN201320411730U CN203404974U CN 203404974 U CN203404974 U CN 203404974U CN 201320411730 U CN201320411730 U CN 201320411730U CN 203404974 U CN203404974 U CN 203404974U
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- heat exchanger
- gas heater
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- exchanger tube
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Abstract
The utility model discloses a heat exchanger of a gas water heater and the gas water heater. The heat exchanger comprises a heat exchanger outer shell, a heat exchanging pipe and a heat exchanging sheet which is provided with through holes for the heat exchanging pipe to pass through. The heat exchanging sheet is provided with at least two rows of heat exchanging pipe through holes which are arrayed up and down. In addition, at least one flow guiding plate is arranged above the heat exchanging pipe through holes close to the left side and/or the right side of the heat exchanging sheet, an included angle is formed between the flow guiding plate and the smoke-ascending-flowing direction in a combustion chamber of the gas water heater, therefore, ascending-flowing high-temperature smoke can be guided, turbulent flow is formed, accordingly, cold water flowing through the heat exchanging pipe and high-temperature smoke can carry out full heat exchanging, and the heat exchanging efficiency of the heat exchanger is effectively improved.
Description
Technical field
The utility model relates to heat exchanger technical field, especially relates to a kind of heat exchanger and gas heater of gas heater.
Background technology
Rapid economic development, people require more and more higher to bathing, the especially perfection attractive in appearance to gas heater, extra-thin gas heater more and more obtains everybody favor.Therefore, gas heater manufacturing enterprise reduces the size of all parts by variety of way, yet after the attenuation of one of critical component of gas heater heat exchanger, can cause more than heat-exchanger surface temperature rising 200K, heat runs off serious, its surface there will be burn vestige, thereby accelerate the aging of heat exchanger, shortened the service life of heat exchanger.In addition, high-temperature flue gas is directly upwards discharged through the compare great space, the heat exchanger fin left and right sides of heat exchanger along vertical direction, and heat exchange efficiency is low, so the efficiency pendulum that becomes up to standard is in a thorny difficult problem for each gas heater manufacturing enterprise.
Utility model content
Main purpose of the present utility model is to provide a kind of heat exchanger and gas heater of gas heater, is intended to prevent that phenomenon, the loss that reduces high-temperature flue gas heat of burning and the heat exchange efficiency that improves gas heater from appearring in the outer surface of heat exchanger.
To achieve these objectives, the utility model proposes a kind of heat exchanger of gas heater, comprise heat exchanger housing, heat exchanger tube and be provided with the heat exchanger fin of the through hole passing through for described heat exchanger tube, on described heat exchanger fin, offer at least two row's heat exchanger tube through holes that go to upper and lower distribution, in addition, described heat exchanger fin is provided with at least one deflector near the top of the heat exchanger tube through hole of its left side limit and/or right edge, the flue gas rising flow direction in the combustion chamber of described deflector and gas heater be an angle.
Preferably, described angle is 120 ° ~ 150 °.
Preferably, on described heat exchanger fin, offer the heat exchanger tube through hole that two rows go to upper and lower distribution, described heat exchanger fin is respectively provided with two near the top of the heat exchanger tube through hole of its left side limit and right edge and goes to upper and lower described deflector spaced apart, and two described deflectors being oppositely arranged of both sides extension line is along its length reverse V-shaped.
Preferably, described two rows' heat exchanger tube through holes are also provided with two described deflectors of V-shaped layout in the position between staggering between the upper and lower.
Preferably, on described heat exchanger fin, offer the heat exchanger tube through hole that three rows go to upper and lower distribution, described heat exchanger fin is respectively provided with two near the top of the heat exchanger tube through hole of its left side limit and right edge and goes to upper and lower described deflector spaced apart, and two described deflectors being oppositely arranged of both sides extension line is along its length reverse V-shaped.
Preferably, in described in each, the both sides, below of row's heat exchanger tube through hole are provided with two described deflectors that are reverse V-shaped layout; In described in each, the top of row's heat exchanger tube through hole is provided with two described deflectors of V-shaped layout.
Preferably, described deflector is the plate-like structure of long straight shape.
Preferably, the limit, the left and right sides of described heat exchanger fin respectively bending go out one vertical with described heat exchanger fin and with described deflector turnup structure in the same way.
Preferably, described heat exchanger fin is provided with some flange pod apertures, and the flange of described flange pod apertures and described deflector are positioned at the same side of described heat exchanger fin.
Preferably, described flange pod apertures position between heat exchanger tube through hole in the left and right sides of described heat exchanger fin and described in each.
The utility model proposes a kind of gas heater simultaneously, heat exchanger is equipped with in inside, this heat exchanger comprises heat exchanger housing, heat exchanger tube and is provided with the heat exchanger fin of the through hole passing through for described heat exchanger tube, on described heat exchanger fin, offer at least two row's heat exchanger tube through holes that go to upper and lower distribution, in addition, described heat exchanger fin is provided with at least one deflector near the top of the heat exchanger tube through hole of its left side limit and/or right edge, the flue gas rising flow direction in the combustion chamber of described deflector and gas heater be an angle.
The heat exchanger of a kind of gas heater provided by the utility model and gas heater, by some deflectors that are inclined to set are set on heat exchanger fin, can lead to the mobile high-temperature flue gas that rises, heat exchanger fin high-temperature flue gas is to each other flowed with the form of gathering to heat exchanger tube, and form turbulent flow, reduce high-temperature flue gas by heat exchanger tube and heat exchanger fin speed to each other, thereby cold water and high-temperature flue gas in the heat exchanger tube that makes to flow through carry out sufficient heat exchange, effectively improved the heat exchange efficiency of heat exchanger, avoided simultaneously because of the hull-skin temperature of heat exchanger too high, the phenomenon that occurs burn, extended the service life of heat exchanger.In addition, on heat exchanger fin, be also provided with some flange pod apertures, not only increased the surface area of heat exchanger fin, can also make high-temperature flue gas further produce turbulent flow, improved the heat exchange efficiency of heat exchanger.
Accompanying drawing explanation
Fig. 1 is the structural representation of the heat exchanger preferred embodiment of the utility model gas heater;
Fig. 2 is the cutaway view of heat exchanger straight vertical tube axis direction in Fig. 1;
Fig. 3 is the first structural representation of heat exchanger fin in Fig. 1;
Fig. 4 is the second structural representation of heat exchanger fin in Fig. 1;
Fig. 5 is the third structural representation of heat exchanger fin in Fig. 1.
The realization of the utility model object, functional characteristics and advantage, in connection with embodiment, are described further with reference to accompanying drawing.
The specific embodiment
Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
Referring to Fig. 1, Fig. 1 is the structural representation of the heat exchanger preferred embodiment of the utility model gas heater.
The heat exchanger 1 of the gas heater that the present embodiment provides, comprise heat exchanger housing 11, heat exchanger fin 12 and heat exchanger tube, heat exchanger tube comprises straight tube 13, U-shaped pipe 14 and coil pipe 15, straight tube 13 runs through heat exchanger housing 11 and passes heat exchanger fin 12, U-shaped pipe 14 is communicated with each straight tube 13, coil pipe 15 is coiled in the shape of a spiral the outer surface of heat exchanger housing 11 and is communicated with straight tube 13, forms a water stream channel with a water inlet and a delivery port.The material of the heat exchanger housing 11 of the present embodiment, heat exchanger fin 12 and heat exchanger tube is preferably copper or copper alloy, has guaranteed heat exchange property that heat exchanger 1 is good and longer service life.This heat exchanger 1 for make cold water mobile in heat exchanger tube and heat exchanger fin 12 to each other mobile high-temperature flue gas carry out heat exchange, thereby reach the object that the lower water of temperature is heated.
On heat exchanger fin 12, offer at least two row's heat exchanger tube through holes 121 that go to upper and lower distribution, heat exchanger fin 12 is provided with at least one deflector 122 near the top of the heat exchanger tube through hole 121 of its left side limit and/or right edge, the flue gas rising flow direction in the combustion chamber of deflector 122 and gas heater be an angle.Referring to Fig. 2 and Fig. 3, heat exchanger fin 12 in this enforcement offers the two row's heat exchanger tube through holes 121 that go to upper and lower distribution, these two rows' heat exchanger tube through hole 121 is for being interval shift type distributed architecture, the mobile high-temperature flue gas that guaranteed to rise can fully contact with every straight tube 13, and the high-temperature flue gas passing through that makes to rise produces turbulent flow, improves heat exchanger effectiveness.Heat exchanger fin 12 is provided with some deflectors 122, this deflector 122 is the straight shape plate-like structure of length that stamping-out forms on heat exchanger fin 12, in other embodiments, deflector 122 can also be other versions, as is corrugated plate shape or surface is provided with bulge-structure etc.In order to make high-temperature flue gas form better turbulent flow, and guarantee that flue can carry out exhaust smoothly, the burner of avoiding gas heater is because lacking the oxygen inadequate phenomenon that occurs burning, the angle of the high-temperature flue gas rising flow direction in the combustion chamber of deflector 122 and gas heater is preferably 120 ° ~ 150 °, and the high-temperature flue gas rising flow direction in the combustion chamber of deflector 122 relative gas heaters is inclined to set.Particularly, heat exchanger fin 12 is respectively provided with two near the top of the heat exchanger tube through hole 121 of its left side limit and right edge and presents, lower deflector 122 spaced apart, deflector 122 is positioned at heat exchanger fin 12 compare great positions, space, the left and right sides, and two deflectors 122 of both sides are oppositely arranged respectively, two couple of heat exchanger fin 12 both sides respectively relative deflector 122 extension line is along its length reverse V-shaped, thereby make the high-temperature flue gas that heat exchanger fin 12 compare great positions, space, the left and right sides are passed through flow to the position that is furnished with straight tube 13, reduce high-temperature flue gas toward the effusion of heat exchanger fin 12 left and right sides, improved the heat exchange efficiency of heat exchanger 1.
In addition, two rows' heat exchanger tube through hole 121 is also provided with two V-shaped deflectors 122 in the position between staggering between the upper and lower, the direction up of lower end of heat exchanger 1 of take is benchmark, directly over all the other heat exchanger tube through holes 121 of the heat exchanger tube through hole 121 that deflector 122 is arranged in lower row except two ends, left and right, thereby make the straight tube 13 of high-temperature flue gas by lower row by the guide effect of deflector 122, row's straight tube 13 in the flow direction, and make the high-temperature flue gas passing through form turbulent flow, further improve the heat exchange efficiency of heat exchanger 1.
Accordingly, the deflector 122 being inclined to set by the high-temperature flue gas rising flow direction arranging on heat exchanger fin 12 in the combustion chamber of some and gas heater, can lead to the mobile high-temperature flue gas that rises, make the form mobile (as arrow in Fig. 3 as shown in) of heat exchanger fin 12 high-temperature flue gas to each other to gather to straight tube 13, reduce the loss of high-temperature flue gas, and form turbulent flow, reduce high-temperature flue gas by straight tube 13 and heat exchanger fin 12 speed to each other, thereby cold water and high-temperature flue gas in make to flow through coil pipe 15 and straight tube 13 carry out sufficient heat exchange, effectively improved the heat exchange efficiency of heat exchanger 1.Meanwhile, avoided too high because of the hull-skin temperature of heat exchanger 1, occurred the phenomenon of burn, extended the service life of heat exchanger 1.
Referring to Fig. 4, another embodiment of the present utility model is proposed.In the present embodiment, heat exchanger fin 12 offers the heat exchanger tube through hole 121 that three rows go to upper and lower distribution, and from the lower end of heat exchanger 1 is successively up, row's heat exchanger tube through hole 1211 is, middle row's heat exchanger tube through hole 1212 and upper row's heat exchanger tube through hole 1213.Heat exchanger fin 12 is respectively provided with two near the top of the lower row's of its left side limit and right edge heat exchanger tube through hole 1211 and goes to upper and lower deflector spaced apart 122, this deflector 122 lays respectively at two deflectors 122 that the ，Qie both sides, both sides of middle row's heat exchanger tube through hole 1212 are oppositely arranged extension line along its length and is reverse V-shaped.Thereby can realize, the mobile high-temperature flue gas that rises is led, make the form mobile (as arrow in Fig. 4 as shown in) of heat exchanger fin 12 high-temperature flue gas to each other to gather to straight tube 13, reduce the loss of high-temperature flue gas, and form turbulent flow, reduce high-temperature flue gas by straight tube 13 and heat exchanger fin 12 speed to each other, thereby cold water and high-temperature flue gas in make to flow through coil pipe 15 and straight tube 13 carry out sufficient heat exchange, have effectively improved the heat exchange efficiency of heat exchanger 1.
Further, the both sides, below of the heat exchanger tube through hole 1212 of arranging in each are provided with two deflectors 122 that are reverse V-shaped layout, the top of the heat exchanger tube through hole 1212 of arranging in each is provided with two deflectors 122 of V-shaped layout, between deflector 122 two ends and heat exchanger tube through hole 121, leave the gap by high-temperature flue gas, high-temperature flue gas is crossed from multiple directions, be beneficial to form turbulent flow, in addition, also can lead to the mobile high-temperature flue gas that rises, make the form mobile (as arrow in Fig. 4 as shown in) of heat exchanger fin 12 high-temperature flue gas to each other to gather to straight tube 13, thereby cold water and high-temperature flue gas in make to flow through coil pipe 15 and straight tube 13 carry out sufficient heat exchange, further improved the heat exchange efficiency of heat exchanger 1.
Referring to Fig. 5, another embodiment of the present utility model is proposed.In the present embodiment, the version of the heat exchanger tube through hole 121 that heat exchanger fin 12 is offered and the arrangement form of deflector 122 be identical with above-described embodiment all, and therefore not to repeat here.Different from above-described embodiment is, in this embodiment, on heat exchanger fin 12, be also provided with the flange pod apertures 123 of some circles, certainly flange pod apertures 123 can be also other shapes, as oval, conical or square etc., the flange of this flange pod apertures 123 and deflector 122 are positioned at the same side of heat exchanger fin 12.Particularly, flange pod apertures 123 at heat exchanger fin 12 near its left side limit and the both sides of right edge and the position between each heat exchanger tube through hole 121.By set up flange pod apertures 123 on heat exchanger fin 12, in the situation that do not increase the appearance and size of heat exchanger fin 12, increased the surface area of heat exchanger fin 12, make the contact area of high-temperature flue gas and heat exchanger fin 12 larger, heat transfer effect is better.In addition, this flange pod apertures 123 also can make high-temperature flue gas further produce turbulent flow, slows down high-temperature flue gas by the speed of heat exchanger 1, guarantees that heat exchanger fin 12 and heat exchanger tube can carry out sufficient heat exchange with high-temperature flue gas, have improved the heat exchange efficiency of heat exchanger 1.
In the above embodiment, the dual-side of heat exchanger fin 12 respectively bending go out one vertical with heat exchanger fin 12 and with deflector 122 turnup structure 124 in the same way.By the dual-side at every heat exchanger fin 12 respectively bending go out turnup structure 124, in the situation that keep heat exchanger 1 constancy of volume of former gas heater, increased to a certain extent the surface area of heat exchanger fin 12, improve the heat exchange property of heat exchanger 1, improved the heat exchange efficiency of heat exchanger 1.In addition, when assembling heat exchanger fin 12, the end face of the turnup structure 124 of heat exchanger fin 12 is connected to the surface of another sheet heat exchanger fin 12, can control well heat exchanger fin 12 distance each other, it is equally spaced, guarantee that heat exchanger fin 12, to each other evenly by high-temperature flue gas, makes the water thermally equivalent in each root straight tube 13.
The utility model also proposes a kind of gas heater.
The gas heater that the present embodiment provides, inside is provided with heat exchanger, this heat exchanger comprises heat exchanger housing, heat exchanger tube and is provided with the heat exchanger fin of the through hole passing through for described heat exchanger tube, on heat exchanger fin, offer at least two row's heat exchanger tube through holes that go to upper and lower distribution, in addition, heat exchanger fin is provided with at least one deflector near the top of the heat exchanger tube through hole of its left side limit and/or right edge, the flue gas rising flow direction in the combustion chamber of deflector and gas heater be an angle.
This gas heater embodiment comprises whole technical schemes of the whole embodiment of above-mentioned heat exchanger, and the technique effect reaching is also identical, does not repeat them here.
Should be understood that; these are only preferred embodiment of the present utility model; can not therefore limit the scope of the claims of the present utility model; every equivalent structure or conversion of equivalent flow process that utilizes the utility model description and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (11)
1. the heat exchanger of a gas heater, comprise heat exchanger housing, heat exchanger tube and be provided with the heat exchanger fin of the through hole passing through for described heat exchanger tube, on described heat exchanger fin, offer at least two row's heat exchanger tube through holes that go to upper and lower distribution, it is characterized in that, described heat exchanger fin is provided with at least one deflector near the top of the heat exchanger tube through hole of its left side limit and/or right edge, the flue gas rising flow direction in the combustion chamber of described deflector and gas heater be an angle.
2. the heat exchanger of gas heater according to claim 1, is characterized in that, described angle is 120 ° ~ 150 °.
3. the heat exchanger of gas heater according to claim 2, it is characterized in that, on described heat exchanger fin, offer the heat exchanger tube through hole that two rows go to upper and lower distribution, described heat exchanger fin is respectively provided with two near the top of the heat exchanger tube through hole of its left side limit and right edge and goes to upper and lower described deflector spaced apart, and two described deflectors being oppositely arranged of both sides extension line is along its length reverse V-shaped.
4. the heat exchanger of gas heater according to claim 3, is characterized in that, described two rows' the heat exchanger tube through holes between the upper and lower position between staggering are also provided with two described deflectors of V-shaped layout.
5. the heat exchanger of gas heater according to claim 2, it is characterized in that, on described heat exchanger fin, offer the heat exchanger tube through hole that three rows go to upper and lower distribution, described heat exchanger fin is respectively provided with two near the top of the heat exchanger tube through hole of its left side limit and right edge and goes to upper and lower described deflector spaced apart, and two described deflectors being oppositely arranged of both sides extension line is along its length reverse V-shaped.
6. the heat exchanger of gas heater according to claim 5, is characterized in that, described in each, the both sides, below of middle row's heat exchanger tube through hole are provided with two described deflectors that are reverse V-shaped layout; In described in each, the top of row's heat exchanger tube through hole is provided with two described deflectors of V-shaped layout.
7. according to the heat exchanger of the gas heater described in any one in claim 1 to 6, it is characterized in that, described deflector is the plate-like structure of long straight shape.
8. according to the heat exchanger of the gas heater described in any one in claim 1 to 6, it is characterized in that, the limit, the left and right sides of described heat exchanger fin respectively bending go out one vertical with described heat exchanger fin and with described deflector turnup structure in the same way.
9. according to the heat exchanger of the gas heater described in any one in claim 1 to 6, it is characterized in that, described heat exchanger fin is provided with some flange pod apertures, and the flange of described flange pod apertures and described deflector are positioned at the same side of described heat exchanger fin.
10. the heat exchanger of gas heater according to claim 9, is characterized in that, described flange pod apertures is position between heat exchanger tube through hole in the left and right sides of described heat exchanger fin and described in each.
11. 1 kinds of gas heaters, is characterized in that, comprise the heat exchanger as described in any one in claim 1 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320411730.1U CN203404974U (en) | 2013-07-10 | 2013-07-10 | Heat exchanger of gas water heater and gas water heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320411730.1U CN203404974U (en) | 2013-07-10 | 2013-07-10 | Heat exchanger of gas water heater and gas water heater |
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| Publication Number | Publication Date |
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| CN203404974U true CN203404974U (en) | 2014-01-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320411730.1U Expired - Lifetime CN203404974U (en) | 2013-07-10 | 2013-07-10 | Heat exchanger of gas water heater and gas water heater |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103954042A (en) * | 2014-05-21 | 2014-07-30 | 成都市双流壁挂热交换器有限责任公司 | Heat-absorbing piece for five-tube gas water heater |
| CN104110868A (en) * | 2014-06-10 | 2014-10-22 | 芜湖美的厨卫电器制造有限公司 | Heat exchanger for gas water heater and gas water heater with same |
| CN106643255A (en) * | 2016-10-31 | 2017-05-10 | 宁波方太厨具有限公司 | Efficient heat exchange fin |
| CN108692602A (en) * | 2017-04-10 | 2018-10-23 | 芜湖美的厨卫电器制造有限公司 | The equipment of heat exchanger fin, heat exchanger and application heat exchanger |
| CN111006395A (en) * | 2019-12-27 | 2020-04-14 | 四川昊宇龙星科技有限公司 | Rectangular surrounding type heat exchanger |
| CN111435031A (en) * | 2019-01-14 | 2020-07-21 | 宁波方太厨具有限公司 | Heat exchanger and gas water heater using same |
| CN111664585A (en) * | 2020-06-10 | 2020-09-15 | 珠海格力电器股份有限公司 | Heat exchange device and water heater |
| CN112556182A (en) * | 2020-12-01 | 2021-03-26 | 廖悦 | Biomass energy combustion heat conduction oil boiler |
| CN112556166A (en) * | 2019-09-26 | 2021-03-26 | 株式会社能率 | Water heating device |
| CN112682790A (en) * | 2019-10-17 | 2021-04-20 | 芜湖美的厨卫电器制造有限公司 | Combustion heat exchange assembly and gas water heater |
| CN118149615A (en) * | 2024-05-09 | 2024-06-07 | 杭州老板电器股份有限公司 | Heat exchanger and gas water heater |
-
2013
- 2013-07-10 CN CN201320411730.1U patent/CN203404974U/en not_active Expired - Lifetime
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103954042A (en) * | 2014-05-21 | 2014-07-30 | 成都市双流壁挂热交换器有限责任公司 | Heat-absorbing piece for five-tube gas water heater |
| CN104110868A (en) * | 2014-06-10 | 2014-10-22 | 芜湖美的厨卫电器制造有限公司 | Heat exchanger for gas water heater and gas water heater with same |
| CN106643255A (en) * | 2016-10-31 | 2017-05-10 | 宁波方太厨具有限公司 | Efficient heat exchange fin |
| CN108692602A (en) * | 2017-04-10 | 2018-10-23 | 芜湖美的厨卫电器制造有限公司 | The equipment of heat exchanger fin, heat exchanger and application heat exchanger |
| CN111435031A (en) * | 2019-01-14 | 2020-07-21 | 宁波方太厨具有限公司 | Heat exchanger and gas water heater using same |
| CN111435031B (en) * | 2019-01-14 | 2021-08-20 | 宁波方太厨具有限公司 | Heat exchanger and gas water heater using same |
| CN112556166A (en) * | 2019-09-26 | 2021-03-26 | 株式会社能率 | Water heating device |
| CN112556166B (en) * | 2019-09-26 | 2023-04-07 | 株式会社能率 | Water heating device |
| CN112682791B (en) * | 2019-10-17 | 2022-09-27 | 芜湖美的厨卫电器制造有限公司 | Combustion heat exchange assembly and gas water heater |
| CN112682790A (en) * | 2019-10-17 | 2021-04-20 | 芜湖美的厨卫电器制造有限公司 | Combustion heat exchange assembly and gas water heater |
| CN112682791A (en) * | 2019-10-17 | 2021-04-20 | 芜湖美的厨卫电器制造有限公司 | Combustion heat exchange assembly and gas water heater |
| CN112682790B (en) * | 2019-10-17 | 2022-09-27 | 芜湖美的厨卫电器制造有限公司 | Combustion heat exchange assembly and gas water heater |
| CN111006395A (en) * | 2019-12-27 | 2020-04-14 | 四川昊宇龙星科技有限公司 | Rectangular surrounding type heat exchanger |
| CN111664585A (en) * | 2020-06-10 | 2020-09-15 | 珠海格力电器股份有限公司 | Heat exchange device and water heater |
| CN112556182A (en) * | 2020-12-01 | 2021-03-26 | 廖悦 | Biomass energy combustion heat conduction oil boiler |
| CN118149615A (en) * | 2024-05-09 | 2024-06-07 | 杭州老板电器股份有限公司 | Heat exchanger and gas water heater |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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Granted publication date: 20140122 |