CN114370704A - Wall-mounted furnace - Google Patents

Wall-mounted furnace Download PDF

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Publication number
CN114370704A
CN114370704A CN202210055649.8A CN202210055649A CN114370704A CN 114370704 A CN114370704 A CN 114370704A CN 202210055649 A CN202210055649 A CN 202210055649A CN 114370704 A CN114370704 A CN 114370704A
Authority
CN
China
Prior art keywords
heat exchange
shell
tube
exchange tubes
group
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210055649.8A
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Chinese (zh)
Inventor
刘文涛
赵华
李志伟
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shandong Aikeduo Heat Energy Science And Technology Co ltd
Original Assignee
Shandong Aikeduo Heat Energy Science And Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shandong Aikeduo Heat Energy Science And Technology Co ltd filed Critical Shandong Aikeduo Heat Energy Science And Technology Co ltd
Priority to CN202210055649.8A priority Critical patent/CN114370704A/en
Publication of CN114370704A publication Critical patent/CN114370704A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/10—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium
    • F24H1/12—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium
    • F24H1/14—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium by tubes, e.g. bent in serpentine form
    • F24H1/145—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium by tubes, e.g. bent in serpentine form using fluid fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/0005—Details for water heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/0005—Details for water heaters
    • F24H9/0036—Dispositions against condensation of combustion products
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/18—Arrangement or mounting of grates or heating means
    • F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
    • F24H9/1832—Arrangement or mounting of combustion heating means, e.g. grates or burners
    • F24H9/1836—Arrangement or mounting of combustion heating means, e.g. grates or burners using fluid fuel

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

The invention relates to a wall-mounted furnace which comprises a shell, wherein a fan is arranged at the top of the shell, a smoke exhaust pipe is arranged on the side part of the shell, a fire tube heat exchanger is arranged in the middle of the shell, and a circulating pump, a gas valve and a condensed water box are arranged at the bottom of the shell; the fire tube heat exchanger comprises a shell, wherein a combustion chamber is arranged at the upper part of the shell, and a heat exchange tube group is arranged at the bottom of the combustion chamber; the heat exchange tube group comprises two groups of tube plates which are arranged in parallel, a plurality of groups of heat exchange tubes which are uniformly arranged along the vertical direction are arranged between the two tube plates, each group of heat exchange tubes are wavy along the length direction, the cross section of each group of heat exchange tubes is oblong, at least one group of grooves which extend along the length direction of the heat exchange tubes and face the inner side of the heat exchange tubes are arranged on two opposite parallel side walls of each group of heat exchange tubes respectively, and the grooves form oppositely arranged ribs on the wall surfaces of the heat exchange tubes. Utilize the flat pipe formation firetube heat exchanger of multiunit surface area recess, promote the heat exchange efficiency of heat exchanger.

Description

Wall-mounted furnace
Technical Field
The invention relates to the technical field of gas wall-mounted furnaces, in particular to a wall-mounted furnace.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The core part heat exchanger of hanging stove at present adopts the coil pipe structure usually, the mode that utilizes the tubular metal resonator to coil along the helical direction forms the coil pipe, the combustor is located the central point that coils the circumference and puts, and in order to satisfy the heat transfer requirement of flue gas, the clearance between the coil pipe is very little, cause the result of gas combustion and impurity to adhere to easily and cause the jam on the pipe wall, reduce the normal operating of heat exchange efficiency influence equipment, some utilize flat pipe to form the heat exchanger waterway of coil pipe less, the pipe wall heat transfer effect that incrustation scale and impurity jam caused drops sharply easily and arouses the pipe wall overtemperature and damage.
Disclosure of Invention
In order to solve the technical problems in the background art, the invention provides a wall-mounted furnace, which utilizes a plurality of groups of flat tubes with grooves on the surfaces to form a fire tube heat exchanger and improves the heat exchange efficiency of the heat exchanger.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a wall-mounted furnace, which comprises a shell, wherein a fan is arranged at the top of the shell, a smoke exhaust pipe is arranged at the side part of the shell, a fire tube heat exchanger is arranged at the middle part of the shell, and a circulating pump, a gas valve and a condensed water box are arranged at the bottom of the shell;
the fire tube heat exchanger comprises a shell, wherein a combustion chamber is arranged at the upper part of the shell, and a heat exchange tube group is arranged at the bottom of the combustion chamber; the heat exchange tube group comprises two groups of tube plates which are arranged in parallel, a plurality of groups of heat exchange tubes which are uniformly arranged along the vertical direction are arranged between the two tube plates, each group of heat exchange tubes are wavy along the length direction, the cross section of each group of heat exchange tubes is oblong, at least one group of grooves which extend along the length direction of the heat exchange tubes and face the inner side of the heat exchange tubes are arranged on two opposite parallel side walls of each group of heat exchange tubes respectively, and the grooves form oppositely arranged ribs on the wall surfaces of the heat exchange tubes.
The bottom of the heat exchange tube set is provided with a smoke collection chamber, the side part of the smoke collection chamber is provided with a smoke outlet, and the smoke outlet is connected with a smoke exhaust tube.
The combustor is arranged in the combustion chamber, and the top of the combustion chamber is provided with a heat insulation plate.
The bottom of the combustion chamber is communicated with a flue gas inlet of the heat exchange tube set, and a flue gas outlet of the heat exchange tube set is communicated with the smoke collection chamber.
The outlet of the fan is connected with the fire tube heat exchanger; the inlet of the fan is provided with a premixing pipe, and the premixing pipe is connected with a gas valve through a gas pipe; the smoke outlet of the fire tube heat exchanger is connected with a smoke exhaust pipe, and the outlet of the smoke exhaust pipe faces the top of the shell; the inlet of the circulating pump is provided with a water inlet valve, and the outlet of the circulating pump is connected with the water inlet of the fire tube heat exchanger through a water inlet pipe; the water outlet of the fire tube heat exchanger is connected with a water outlet valve through a water outlet pipe, and a three-way valve is arranged on the water outlet pipe.
The lower part of the shell is provided with a water inlet, and the upper part of the shell is provided with a water outlet.
The condensed water box is positioned at the bottom of the smoke collection chamber and is used for collecting condensed water.
Compared with the prior art, the above one or more technical schemes have the following beneficial effects:
1. utilize long circular pipe (flat pipe) of multiunit surface area recess to form firetube heat exchanger, replace traditional coil pipe for the area of passage of heat exchange tube is great, and the difficult problem that the combustion products blockked up appears of the mode of arranging perpendicularly.
2. The combustion gas is blown into the heat exchange tube group at the lower part from the combustion chamber at the upper part under the driving of the fan, and the generated combustion products and condensate can be blown off the tube wall of the heat exchange tube under the blowing of the fan, so that the self-cleaning function is realized.
3. The corrugated heat exchange tube has certain elasticity, and is allowed to bend when subjected to thermal stress change, so that the service life of the wall-mounted furnace is prolonged.
4. The liquid drops of the condensate are entrained in the downward flowing gas along with the flowing of the combustion gas instead of being tightly attached to the pipe wall, so that the generation of a water film at the bottom of the heat exchange pipe is avoided, and the heat transfer efficiency at the lower part of the heat exchange pipe is enhanced.
5. The grooves on the surfaces of the two adjacent heat exchange tubes form an approximately circular water channel, so that the water channel blocking resistance is higher, the water volume is larger, the fluctuation of the outlet water temperature is smaller when domestic hot water is provided, and the water channel is better in hot water comfort.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic view of the overall structure of a fire tube wall hanging stove according to one or more embodiments of the present invention;
fig. 2(a) is a schematic view of a fire tube heat exchanger of a fire tube wall-hanging furnace according to one or more embodiments of the present invention;
FIG. 2(b) is a side view schematic illustration of a firetube heat exchanger according to one or more embodiments of the present invention;
FIG. 3(a) is a schematic side view of a heat exchange tube in a firetube heat exchanger according to one or more embodiments of the present invention;
fig. 3(b) is a schematic elevation view of a heat exchange tube according to one or more embodiments of the present invention;
in fig. 1: 1. the system comprises a fire tube heat exchanger, a fan, a premixing tube, a smoke exhaust tube, a circulating pump, a water inlet valve, a water inlet tube, a water outlet tube, a water circulating pump, a circulating pumps, a circulating water circulating pumps, a circulating water circulating pump, a circulating water circulating pump, a circulating water circulating pump, a circulating water pump, a circulating pump, a water outlet valve, a water valve, a circulating pump, a circulating, a heat, a fan;
in fig. 2: 10. the device comprises a heat insulation plate, 11, a combustion chamber, 12, a combustor, 13, heat exchange pipes, 14, a smoke collection chamber, 15, a smoke exhaust port, 16, a water inlet, 17 and a water outlet;
in fig. 3: 131. flue gas inlet, 132, flue gas outlet, 133, groove.
Detailed Description
The invention is further described with reference to the following figures and examples.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The fire tube heat exchanger is an energy exchange device which utilizes the participation of open fire generated by fuel and media in heat exchange, for example, a device which exchanges heat in the open fire generated by combustion of fuel into cold water to obtain hot water in a wall-mounted gas furnace.
As described in the background art, the wall-mounted furnace of the prior art uses a coil pipe formed by winding a circular pipe or a flat pipe as a heat exchanger, and is limited in structure to cause low heat transfer efficiency and easy blockage. Therefore, the following embodiments provide a wall-hanging stove, which uses a plurality of groups of flat tubes with grooves on the surfaces to form fire tube heat exchangers in an evenly distributed manner along the central circumference of a burner, thereby forming the wall-hanging stove with a self-cleaning function.
The first embodiment is as follows:
as shown in fig. 1-3, a wall-mounted boiler comprises a housing, a fan 2 is arranged at the top of the housing, a smoke exhaust pipe 3 is arranged at the side part, a fire tube heat exchanger 1 is arranged at the middle part, and a circulating pump 4, a gas valve 5 and a condensed water box 6 are arranged at the bottom.
The outlet of the fan 2 is connected with the fire tube heat exchanger 1, the inlet of the fan 2 is provided with a premixing pipe 21, and the premixing pipe 21 is connected with a gas valve 5 through a gas pipe 51; the smoke outlet 15 of the fire tube heat exchanger 1 is connected with the smoke exhaust pipe 3, and the outlet of the smoke exhaust pipe 3 faces the top of the shell; the inlet of the circulating pump 4 is provided with a water inlet valve 41, and the outlet is connected with the water inlet 16 of the fire tube heat exchanger 1 through a water inlet pipe 42; the water outlet 17 of the fire tube heat exchanger 1 is connected with a water outlet valve 45 through a water outlet pipe 43, and a three-way valve 44 is arranged on the water outlet pipe 43.
As shown in fig. 2, the fire tube heat exchanger 1 includes a housing, a combustion chamber 11 is provided on the upper portion of the housing, a heat exchange tube set is provided at the bottom of the combustion chamber 11, a smoke collection chamber 14 is provided at the bottom of the heat exchange tube set, a smoke discharge port 15 is provided at the side of the smoke collection chamber 14, and the smoke discharge port 15 is connected to the smoke discharge pipe 3.
A burner 12 is arranged in the combustion chamber 11, and a heat insulation plate 10 is arranged at the top of the combustion chamber 11.
The bottom of the combustion chamber 11 is communicated with a flue gas inlet 131 of the heat exchange tube group, and a flue gas outlet 132 of the heat exchanger is communicated with the smoke collection chamber 14.
The heat exchange tube group comprises two groups of tube plates which are arranged in parallel, a plurality of groups of heat exchange tubes 13 which are uniformly arranged along the vertical direction are arranged between the two tube plates, as shown in fig. 3, the cross section of each group of heat exchange tubes 13 is oblong and wavy along the length direction, at least one group of grooves 133 which are arranged along the length direction of the heat exchange tubes are respectively arranged on two relatively parallel planes of the heat exchange tubes 13, and the grooves 133 form relatively arranged ribs on the wall surfaces of the heat exchange tubes for improving the strength of the heat exchange tubes.
In this embodiment, the combustion chamber 11 is a relatively independent space inside the casing, air and gas sucked from the inlet of the fan 2 are mixed by the premixing tube 21 and then enter the combustion chamber 11 for combustion, the generated high-temperature flue gas enters the heat exchange tube 13, and the water inlet 16 and the water outlet 17 on the casing are respectively communicated with the space outside the heat exchange tube 13, so that the heat of the flue gas is transferred to the water in the space outside the heat exchange tube 13 through the tube wall of the heat exchange tube 13, thereby completing heat exchange.
In the heat exchange process, the heat insulation plate 10 at the top is used for preventing heat from being released to the external space at the top of the fire tube heat exchanger 1, so that the heat is concentrated in the combustion chamber 11 and the heat exchange tube group, and the heat utilization efficiency is improved.
The water inlet 16 is positioned at the lower part of the shell, the water outlet 17 is positioned at the upper part of the shell, external cold water enters the circulating pump 4 through the water inlet valve 41, enters the water inlet 16 at the lower part of the shell of the heat exchange tube group under the action of the circulating pump 4, flows out of the water outlet 17 at the upper part of the shell of the heat exchange tube group after absorbing the heat of the flue gas, and flows out of the water outlet 17 sequentially through the three-way valve 44 and the water outlet valve 45.
The fan 2 is positioned at the top of the fire tube heat exchanger, a certain pressure head is provided, air and fuel gas which are mixed according to a certain proportion are fed into the combustor 12, the air and the fuel gas are combusted on the metal fiber mesh surface on the surface of the combustor 12 to form micro flames, and after the fuel gas enters the combustion chamber 12 for combustion, generated high-temperature flue gas enters the heat exchange tubes 13 from the flue gas inlets 131 of each group of heat exchange tubes 13 at the top of each heat exchange tube group;
each set of heat exchange tubes 13 is oblong in cross-section (i.e., flattened heat exchange tubes), with two parallel side walls having oppositely disposed and at least one groove 133 extending along the length of the tube and facing the inside of the heat exchange tube 13, the grooves 133 forming opposed ribs on the wall surfaces of the heat exchange tube 13;
the flue gas gives the pipe wall with abundant the transmission of heat in heat exchange tube 13, and the pipe wall gives the circulating water outside the heat exchange tube group with heat transmission, and the flue gas has become the low temperature flue gas after abundant heat transfer, discharges to outdoors through exhaust pipe 3, and when the flue gas falls to the uniform temperature under the temperature, vapor in the flue gas can condense into water and appear, forms the comdenstion water in smoke chamber 14, and condensate water box 6 is located smoke chamber 14 bottom for collect the comdenstion water, then through connecting tube discharge furnace body.
The three-way valve 44 is used to mix the heated hot water with external cold water and output warm water at a predetermined temperature.
The heat exchange tube 13 of the fire tube type heat exchanger 1 has a large channel area, and the problem of blockage of combustion products is not easy to occur by adopting a vertical arrangement mode.
The combustor is in an overhead type, smoke gas flows from top to bottom, generated combustion products and condensed water can be blown away from the wall of the heat exchange pipe under the blowing of the fan, and the combustor has a certain self-cleaning function.
The corrugated heat exchanger tube of the fire tube heat exchanger 1 has a certain elasticity allowing it to bend when subjected to thermal stress variations without exerting excessive thermal stress when the heat exchanger tube is welded to the tube sheet.
The shape of the wave pipe can enable the combustion gas to continuously blow away the condensed water from the pipe wall, and the liquid drops of the condensed water are entrained in the downward flowing gas along with the flowing of the combustion gas instead of being tightly attached to the pipe wall, so that the generation of a water film at the bottom of the heat exchange pipe is avoided, and the heat transfer of the lower part of the heat exchange pipe is enhanced.
The grooves 133 on the surfaces of the two adjacent heat exchange tubes 13 in the fire tube type heat exchanger 1 form an approximately circular water channel, so that the fire tube type heat exchanger has stronger water blocking resistance and larger water volume, and the water outlet temperature fluctuation is smaller when domestic hot water is provided, thereby having better hot water comfort.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A hanging stove which characterized in that: the device comprises a shell, wherein a fan is arranged at the top of the shell, a smoke exhaust pipe is arranged on the side part of the shell, a fire tube heat exchanger is arranged in the middle of the shell, and a circulating pump, a gas valve and a condensed water box are arranged at the bottom of the shell;
the fire tube heat exchanger comprises a shell, a combustion chamber is arranged at the upper part of the shell, and a heat exchange tube group is arranged at the bottom of the combustion chamber; the heat exchange tube group comprises two groups of tube plates which are arranged in parallel, a plurality of groups of heat exchange tubes which are uniformly arranged along the vertical direction are arranged between the two tube plates, each group of heat exchange tubes are wavy along the length direction, the cross section of each group of heat exchange tubes is oblong, at least one group of grooves which extend along the length direction of the heat exchange tubes and face the inner side of the heat exchange tubes are arranged on two opposite parallel side walls of each group of heat exchange tubes respectively, and the grooves form oppositely arranged ribs on the wall surfaces of the heat exchange tubes.
2. The wall hanging stove as claimed in claim 1, wherein: the bottom of the heat exchange tube set is provided with a smoke collection chamber, the side part of the smoke collection chamber is provided with a smoke outlet, and the smoke outlet is connected with a smoke exhaust tube.
3. The wall hanging stove as claimed in claim 2, wherein: the bottom of the combustion chamber is communicated with a flue gas inlet of the heat exchange tube set, and a flue gas outlet of the heat exchange tube set is communicated with the smoke collection chamber.
4. The wall hanging stove as claimed in claim 1, wherein: the combustor is arranged in the combustion chamber, and a heat insulation plate is arranged at the top of the combustion chamber.
5. The wall hanging stove as claimed in claim 1, wherein: the outlet of the fan is connected with the fire tube heat exchanger, the inlet of the fan is provided with a premixing pipe, and the premixing pipe is connected with a gas valve through a gas pipe.
6. The wall hanging stove as claimed in claim 1, wherein: the smoke outlet of the fire tube heat exchanger is connected with a smoke exhaust pipe, and the outlet of the smoke exhaust pipe faces the top of the shell.
7. The wall hanging stove of claim 1, wherein: and the inlet of the circulating pump is provided with a water inlet valve, and the outlet of the circulating pump is connected with the water inlet of the fire tube heat exchanger through a water inlet pipe.
8. The wall hanging stove as claimed in claim 1, wherein: the water outlet of the fire tube heat exchanger is connected with a water outlet valve through a water outlet pipe, and a three-way valve is arranged on the water outlet pipe.
9. The wall hanging stove as claimed in claim 1, wherein: the lower part of the shell is provided with a water inlet, and the upper part of the shell is provided with a water outlet.
10. The wall hanging stove as claimed in claim 1, wherein: the condensed water box is positioned at the bottom of the smoke collection chamber and used for collecting condensed water.
CN202210055649.8A 2022-01-18 2022-01-18 Wall-mounted furnace Pending CN114370704A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210055649.8A CN114370704A (en) 2022-01-18 2022-01-18 Wall-mounted furnace

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210055649.8A CN114370704A (en) 2022-01-18 2022-01-18 Wall-mounted furnace

Publications (1)

Publication Number Publication Date
CN114370704A true CN114370704A (en) 2022-04-19

Family

ID=81144430

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210055649.8A Pending CN114370704A (en) 2022-01-18 2022-01-18 Wall-mounted furnace

Country Status (1)

Country Link
CN (1) CN114370704A (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008170088A (en) * 2007-01-12 2008-07-24 Chofu Seisakusho Co Ltd Heat exchanger
CN102840670A (en) * 2012-08-22 2012-12-26 田婧 Strengthened high-efficiency water jacket heating furnace
CN105486125A (en) * 2016-01-11 2016-04-13 芜湖美的厨卫电器制造有限公司 Heat exchanger and water heater
CN110567157A (en) * 2019-10-15 2019-12-13 山东爱客多热能科技有限公司 Fire tube type condensation heat exchanger

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008170088A (en) * 2007-01-12 2008-07-24 Chofu Seisakusho Co Ltd Heat exchanger
CN102840670A (en) * 2012-08-22 2012-12-26 田婧 Strengthened high-efficiency water jacket heating furnace
CN105486125A (en) * 2016-01-11 2016-04-13 芜湖美的厨卫电器制造有限公司 Heat exchanger and water heater
CN110567157A (en) * 2019-10-15 2019-12-13 山东爱客多热能科技有限公司 Fire tube type condensation heat exchanger

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Application publication date: 20220419