CN220453932U - Inverted combustion type combustion water heater and household gas water heater thereof - Google Patents

Abstract

The utility model discloses a reverse burning type combustion water heater and a household gas water heater thereof.A top part of a metal coaming frame of the product is connected with an air-gas mixed gas electric suction device in a sealing way, and a bottom part of the metal coaming frame is connected with a metal bottom plate in a sealing way; the middle section of the box cavity is fixedly connected with a lower-layer fin type heat exchanger and an upper-layer fin type heat exchanger; the first water pipe of the lower fin type heat exchanger is connected with a water inlet joint; the last water pipe of the upper fin type heat exchanger is connected with a water outlet joint; the fin type heat exchangers at the upper layer and the lower layer are hermetically connected with a communicating water channel through a water flow through pipe; a combustion chamber is formed between the upper fin type heat exchanger and the air-gas mixed gas electric suction device, and a combustion distributor and an electronic ignition device are arranged above the combustion chamber; a smoke collecting chamber is formed between the metal bottom plate and the lower fin type heat exchanger; the wall body of the smoke collecting chamber is provided with smoke discharging holes; and the waste heat air flow is secondarily utilized, so that the heat loss of the tail part is reduced, and the heat utilization rate is improved.

Description

Inverted combustion type combustion water heater and household gas water heater thereof

Technical Field

The utility model relates to a water heating combustion device of a household gas water heater, in particular to a reverse burning type combustion water heater.

Background

For example, 1: chinese patent literature publication No.: CN210014566U discloses a heat exchanger for gas water heater, a serial communication port, including the casing, the casing encloses into the flue gas passageway that has flue gas section and heat exchange section, the inside snakelike heat exchange circuit that sets up of flue gas passageway of heat exchange section, heat exchange circuit one end and inlet tube intercommunication, the heat exchange circuit other end is through being used for heat recovery's flat water pipeline and outlet pipe intercommunication, the water pipeline sets up on the casing outer wall of flue gas section, the water inlet end of water pipeline pass through the pipeline with the water outlet end of heat exchange water route links to each other, the water outlet end of water pipeline with the outlet pipe links to each other. The heat exchange loop comprises a plurality of straight pipes, the straight pipes transversely penetrate through the flue gas channels of the heat exchange sections, the heat exchange fins are sequentially overlapped and sleeved on the straight pipes, and the end parts of the straight pipes penetrate out of the side walls of the shell respectively and are connected into the serpentine heat exchange loop through the heat exchange pipes. The water pipeline comprises a flat pipeline, and the flat pipeline is tightly attached to the outer wall of the flue gas section shell. The flat plate pipeline comprises two parts which are respectively arranged on the opposite outer walls of the flue gas section shell, and the two flat plate pipelines are respectively in close contact with the outer walls of the flue gas section shell. The two side walls of the flat plate pipeline are respectively provided with a water inlet and a water outlet, and the water inlets and the water outlets on the side walls of the two flat plate pipelines at the same side are respectively communicated through connecting pipes.

The heat exchange fins and the straight pipes of the heat exchanger are arranged at the top of the shell, when in combustion, the heat exchange fins and the straight pipes are combusted from bottom to top, only one heat exchange process is performed, no waste heat is utilized, preheating cannot be performed, and the heat utilization rate is poor.

For example 2: chinese patent literature publication No.: CN218627303U discloses a novel detachable construction heat exchanger, including combustion chamber outside cavity, inner chamber and heat exchanger, the inner chamber is by a plurality of baffles concatenation shaping that are the setting of U-shaped, the heat exchanger includes both sides baffle and a plurality of heat transfer fins of fixedly locating between two baffles, the lateral wall intercommunication of heat exchanger is equipped with a plurality of copper pipe connectors, the intercommunication is equipped with the U-shaped pipe between two copper pipe connectors in the middle, both sides copper pipe connector intercommunication respectively is equipped with inlet tube and outlet pipe, the intercommunication is equipped with the bypass pipe between inlet tube and the outlet pipe, the inside upper end of locating the combustion chamber outside cavity is placed to the heat exchanger.

The heat exchanger is arranged at the upper end of the inner part of the combustion chamber cavity, and burns from bottom to top during combustion, hot air flows rapidly rise, the top of the heat exchanger is open, after the high Wen Duihuan heat exchanger exchanges heat, much waste heat is lost, more heat is lost (flows away), energy is not saved, and the heat utilization rate is not enough; no waste heat is recycled or is not utilized for preheating.

For example 3: chinese patent literature publication No.: CN217303648U discloses a heat exchanger, including heat exchange portion, can dismantle respectively around the heat exchange portion and be connected with non-copper metal sheet, this around non-copper metal sheet encloses to be located the combustion chamber of heat exchange portion below, heat exchange portion is including left side copper and right side copper, alternates left side copper with heat exchange copper pipe between the right side copper, be equipped with on the heat exchange copper pipe and be located the water inlet of heat exchange portion one side and be located heat exchange portion opposite side delivery port.

The heat exchange part is arranged at the upper part of the combustion chamber, when in combustion, the combustion is carried out from bottom to top, hot air flow rises rapidly, after the heat exchange of the high Wen Duihuan hot part, waste heat is discharged from top to outside, so that a lot of waste heat is lost, the heat loss (flowing away) is more, the waste heat cannot be reused, the energy is not saved, and the heat utilization rate is not enough; no waste heat is recycled or is not utilized for preheating.

Disclosure of Invention

The utility model aims to provide the reverse combustion type combustion water heater which has the advantages of reasonable structure, reasonable design, low overall cost, high heat exchange efficiency, energy conservation, environmental protection and heat loss reduction, and is integrally and hermetically combusted.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

the back burning type combustion water heater includes electric air-fuel gas mixed gas sucking device, metal coaming frame, combustion distributor and electronic ignition device; the inside of the metal coaming frame is a box cavity; the top of the metal coaming frame is connected with an air-gas mixed gas electric suction device in a sealing way; a combustion distributor is arranged above the box cavity; an electronic ignition device is arranged above the box cavity, and the ignition electrode of the electronic ignition device is close to the combustion distributor; the middle section of the box cavity is fixedly connected with a lower-layer fin type heat exchanger and an upper-layer fin type heat exchanger, and the left end and the right end of the lower-layer fin type heat exchanger and the upper-layer fin type heat exchanger are in sealing connection with the side walls of the corresponding metal coaming frames; the fins of the lower-layer fin type heat exchanger and the fins of the upper-layer fin type heat exchanger are mutually independent; the first water pipe of the lower fin type heat exchanger is connected with a water inlet joint; the last water pipe of the upper fin type heat exchanger is connected with a water outlet joint; the last water pipe of the lower-layer fin type heat exchanger is connected with the first water pipe of the upper-layer fin type heat exchanger in a sealing way through a water flow through pipe fitting to form unidirectional circulation with the internal water channel of the upper-layer fin type heat exchanger; the water inlet joint and the water outlet joint are arranged outside the metal coaming frame; a combustion chamber is formed between the upper fin type heat exchanger and the air-fuel gas mixed gas electric suction device, and a combustion distributor and an electronic ignition device are arranged above the combustion chamber; the bottom of the metal coaming frame is connected with a metal bottom plate in a sealing way; a smoke collecting chamber is formed between the metal bottom plate and the lower fin type heat exchanger; the smoke collecting chamber and the combustion chamber belong to a part of the box cavity; the wall body of the smoke collecting chamber is provided with a smoke discharging hole which is arranged at the lower section of the metal bottom plate or the metal coaming frame.

Compared with the prior art, the reverse burning type combustion water heater has the beneficial effects that: when the product is burnt and heated, the product is burnt from top to bottom, and the temperature during combustion is high and low; after entering from the water inlet joint, cold water sequentially flows through the lower fin type heat exchanger and the upper fin type heat exchanger, and finally hot water flows out from the water outlet joint; the upper layer fin type heat exchanger is a high temperature combustion chamber for direct combustion, the upper layer fin type heat exchanger has the highest temperature receiving and is a main heater, and the lower layer fin type heat exchanger is used for receiving (absorbing) waste heat air flow after heat exchange of the upper layer fin type heat exchanger; the body temperature of the lower fin type heat exchanger is lower, more heat of the waste heat air flow of the upper layer is received (absorbed), cold water flowing into and flowing through the lower fin type heat exchanger is preheated, the waste heat air flow is reused, the heat absorption effect is better, the heat loss of the tail part is reduced, the heat utilization rate is improved, and the heat exchanger is more energy-saving and environment-friendly; because the fins on the upper layer and the lower layer are independent from each other, heat cannot be directly transferred, and therefore the fins on the upper layer cannot interfere with the fins on the lower layer to receive (absorb) heat for heat exchange.

Drawings

Fig. 1, 2, 3, 4 and 5 are perspective views of the product of the present utility model;

FIG. 6 is a cross-sectional view of a product of the utility model;

FIGS. 7, 8 and 9 are exploded views of the product of the present utility model;

FIGS. 10 and 11 are perspective views of a lower fin type heat exchanger and an upper fin type heat exchanger of the product of the present utility model;

FIGS. 12 and 13 are schematic views of the product with smoke exhaust pipe according to the present utility model;

FIGS. 14 and 15 are schematic front views of the water heater of the present utility model;

FIG. 16 is a schematic view of the internal structure of a water heater according to the present utility model in a sectional view.

The air-gas mixed gas electric intake device 1, the metal coaming frame 2, the combustion distributor 3, the upper fin type heat exchanger 5 of the electronic ignition device 4, the lower fin type heat exchanger 6, the separation space 7, the water inlet joint 8, the water outlet joint 9, the water flow pipe 10, the combustion chamber 11, the metal bottom plate 12, the smoke collecting chamber 13, the smoke exhaust hole 14, the condensed water hole 15, the water drain pipe 151, the flame detection device 16, the metal top plate 1A, the electric fan 1B, the air-gas mixed gas air inlet hole 1C, the upper metal fin 51, the upper metal straight water pipe 52, the upper metal elbow 53, the lower metal fin 61, the lower metal straight water pipe 62, the lower metal elbow 63, the box cavity 21, the outer box shell A, the controller B, the smoke exhaust pipe C, the gas inlet electromagnetic valve control device D, the gas inlet joint pipe E, the water inlet joint pipe F, the water outlet joint pipe G, the water outlet temperature sensor H and the oxygen sensor I.

Detailed Description

The back-burning type combustion water heater belongs to the field of household gas water heater (household gas water heater component/device), and comprises an air-gas mixed gas electric suction device 1, a metal coaming frame 2, a combustion distributor 3 and an electronic ignition device 4; the air-gas mixed gas electric suction device 1 is used for synchronously sucking and uniformly mixing air and gas; the air inlet end of the air-fuel gas mixed gas electric suction device 1 is connected with a fuel gas inlet device to obtain fuel gas;

the metal coaming frame 2 is integrally formed or consists of a front wall plate, a rear wall plate, a left wall plate and a right wall plate, and the front wall plate, the rear wall plate, the left wall plate and the right wall plate are adjacently and hermetically connected; the metal coaming frame 2 is a three-dimensional square; the metal coaming frame 2 is made of stainless steel or copper, and the thickness of a stainless steel or copper plate body is 1-2 mm; the length of the metal coaming box 2 is 18-33 cm, the width is 18-25 cm, and the height is 30-45 cm;

the inside of the metal coaming frame 2 is provided with a box cavity 21, and the box cavity 21 is square;

the top of the metal coaming frame 2 is welded or combined and fixedly and hermetically connected with an air-gas mixed gas electric suction device 1 by screws and sealant; the upper wall body of the box cavity 21 is fixedly connected with a combustion distributor 3 for combustion after ignition; an electronic ignition device 4 is fixedly connected with the upper wall body of the box cavity 21, and the electronic ignition device is an electronic igniter and is used for igniting and burning the combustion distributor 3; the ignition electrode of the electronic ignition device 4 is close to the combustion distributor 3, so that ignition is easy;

the main technical improvement of the product is as follows: the middle section of the box cavity 21 is fixedly connected with a lower-layer fin type heat exchanger 6 and an upper-layer fin type heat exchanger 5 in a sealing and welding manner, the lower-layer fin type heat exchanger 6 and the upper-layer fin type heat exchanger 5 are horizontally arranged, a separation space 7 is formed between the upper layer and the lower layer, the height of the separation space 7 is 1 cm-5 cm, and the structures of the lower-layer fin type heat exchanger 6 and the upper-layer fin type heat exchanger 5 are the same; the left end and the right end of the lower fin type heat exchanger 6 and the upper fin type heat exchanger 5 are welded, sealed and fixed with the side wall of the corresponding metal coaming frame 2; the fins of the lower fin type heat exchanger 6 and the fins of the upper fin type heat exchanger 5 are mutually independent;

the first water pipe of the lower fin type heat exchanger 6 is connected with a water inlet joint 8 for connecting a water inlet pipe and feeding cold water;

the last water pipe of the upper fin type heat exchanger 5 is connected with a water outlet joint 9 which is used for connecting a water outlet pipe and discharging hot water;

the last water pipe of the lower-layer fin type heat exchanger 6 and the first water pipe of the upper-layer fin type heat exchanger 5 are welded and connected with a communicating water channel through a water flow pipe fitting 10 in a sealing way, so that the lower-layer fin type heat exchanger 6 and the inner water channel of the upper-layer fin type heat exchanger 5 form unidirectional flow; the lower fin type heat exchanger 6, the water flow through pipe 10 and the upper fin type heat exchanger 5 are connected in series;

the water inlet joint 8 and the water outlet joint 9 are arranged outside the metal coaming frame 2, so that an external water pipe is conveniently connected; a combustion chamber 11 is formed between the upper fin type heat exchanger 5 and the air-fuel gas mixed gas electric suction device 1, and a combustion distributor 3 and an electronic ignition device 4 are arranged above the combustion chamber 11; the combustion distributor 3 and the electronic ignition device 4 belong to the prior art products;

the bottom of the metal coaming frame 2 is welded and connected with a metal bottom plate 12 in a sealing manner;

a smoke collecting chamber 13 is formed between the metal bottom plate 12 and the lower fin type heat exchanger 6, and smoke is collected for circulation after combustion heat exchange; the smoke collecting chamber 13 and the combustion chamber 11 belong to a part of the box cavity 21, and the smoke collecting chamber 13 and the combustion chamber 11 are formed by being divided up and down by a heat exchanger;

the wall body of the smoke collecting chamber 13 is provided with a smoke discharging hole 14, and the smoke discharging hole 14 is arranged at the lower section of the metal bottom plate 12 or the metal coaming frame 2 and is used for discharging smoke outwards and connected with a smoke discharging pipe C.

When the electric combustion distributor works, air-gas mixed gas is sucked through the air-gas mixed gas electric suction device 1, flows to the combustion distributor 3, is ignited by the electronic ignition device 4 and forms combustion, and when the electric combustion distributor burns, the air pressure sucked through the air-gas mixed gas electric suction device 1 forms downward combustion so as to enable heat to flow downward; the combustion is performed from top to bottom, and the temperature during combustion is high and low; after entering from the water inlet joint 8, water sequentially flows through the lower fin type heat exchanger 6 and the upper fin type heat exchanger 5, and finally hot water flows out from the water outlet joint 9; the upper layer fin type heat exchanger 5 is provided with a high temperature combustion chamber 11 for direct combustion, the upper layer fin type heat exchanger 5 has the highest temperature, and is a main heater, and heated hot water flows out in the direction of the water outlet joint 9; the lower fin type heat exchanger 6 receives (absorbs) the waste heat air flow after the heat exchange of the upper fin type heat exchanger 5; because the lower fin type heat exchanger 6 is cold water, the lower fin type heat exchanger 6 firstly enters cold water, the body temperature of the lower fin type heat exchanger 6 is lower, more heat of waste heat air flow on the upper layer is received (absorbed), the cold water flowing into and flowing through the lower fin type heat exchanger 6 is preheated, the heat absorption effect is better, the heat loss of the tail part is reduced, the heat utilization rate is improved, and the energy-saving and environment-friendly effects are achieved. The fins on the upper layer and the fins on the lower layer are mutually independent, so that heat cannot be directly transferred, the heat received by the fins on the upper layer is mutually independent, and the high temperature of the fins on the upper layer cannot be transferred to the fins on the lower layer, so that the fins on the upper layer cannot interfere the fins on the lower layer to receive (absorb) heat for heat exchange; the hot water preheated by the lower fin heat exchanger 6 flows into the upper fin heat exchanger 5 again, and the preheated water flowing into the upper fin heat exchanger 5 is heated to a higher temperature more quickly and efficiently. The heat exchange belongs to full premix closed loop combustion.

Further: the back surface of the air-gas mixed gas electric inhalation device 1 or the upper wall in the combustion chamber 11 is welded or fixedly connected with the combustion distributor 3 by screws or clamping, and the combustion distributor 3 is connected with one of the components to realize the fixed connection with the combustion distributor 3. The combustion distributor 3 is arranged downward.

Further: the air-gas mixed gas electric suction device 1 comprises a metal top plate 1A and an electric fan 1B, wherein the electric fan 1B is a variable-frequency fan with the power of 60-120W; the circumferential edge of the metal top plate 1A is welded and connected with the top of the metal coaming frame 2 in a sealing way; the thickness of the metal top plate 1A is 1-2 mm; the electric fan 1B is a variable frequency fan, and the power is 60-10 watts; an air-gas mixed gas inlet hole 1C is formed in the middle of the metal top plate 1A, and an air outlet of the electric fan 1B is welded or tightly fixed, sealed and connected with and communicated with an air inlet hole 1C of the metal top plate 1A along the wall body. This is to further refine the specific structure of the air-gas mixed gas electric suction device 1; the structure is reasonable in design, easy to install, low in cost and the like.

Further: the upper section side wall of the metal coaming frame 2 or the air-fuel gas mixed gas electric suction device 1 is connected with an electronic ignition device in a sealing and penetrating way, and the electronic ignition device is connected with one of the components to realize the fixed connection with the ignition device.

Further: the combustion distributor 3 is a mesh fire distributing shell, and is used for distributing fire through a plurality of meshes during combustion, so that the combustion area is increased; the periphery of the edge of the mesh fire dividing shell is welded or screwed with the periphery of the inner wall above the combustion chamber 11.

Further: the metal bottom plate 12 is provided with a condensed water hole 15; when there is condensate, the present condensate hole 15 is used to drain the condensate produced or other combustion impurities. The use of the lower fin heat exchanger 6 for different temperatures and different humidities in different areas during the heat exchange process may generate condensed water. When the smoke discharging hole 14 is arranged on the bottom plate of the tank, the smoke discharging hole 14 can also be used as a condensed water hole 15, and after the smoke discharging hole 14 is connected with the smoke discharging pipe C, the condensed water drainage device is connected with the bottom of the smoke discharging pipe C to drain the condensed water.

Further: the upper side wall of the metal coaming frame 2 or the air-fuel gas mixed gas electric suction device 1 is connected with a flame detection device 16 in a sealing and penetrating way, and the detection head of the flame detection device 16 is close to the combustion distributor 3; the flame detection device 16 is connected to one of the components to achieve a fixed connection. The flame detection means 16 is a flame detection needle/flame detector.

Preferably: the wall body of the metal coaming frame 2 is provided with a through hole, the flame detection device 16 penetrates through the through hole and is screwed with the plate body threads to form a sealed and fixed connection on the wall of the box body, the sealed and fixed connection is used for detecting whether normal combustion is performed, and a detection needle of the flame detection device 16 stretches into the combustion chamber 11 to approach the combustion distributor 3.

Further: the lower fin type heat exchanger 6 comprises a plurality of lower metal fins 61, a plurality of lower metal straight water pipes 62 and a plurality of lower metal elbows 63, wherein the lower metal fins 61 are provided with a plurality of lower water pipe through holes, the lower metal straight water pipes 62 directly penetrate through the corresponding lower water pipe through holes, the fins are connected in a stacked manner, the lower metal straight water pipes 62 and the lower metal fins 61 are connected into a whole by brazing, and the left ends and the right ends of the lower metal straight water pipes 62 are respectively welded with the lower metal elbows 63 in a staggered manner, so that the lower metal straight water pipes 62 and the lower metal elbows 63 are connected in series, and the lower metal straight water pipes 62 form unidirectional circulation; the lower metal fins 61 are provided with hot air flowing gaps, and the width of each hot air flowing gap is 2-3 mm and is used for allowing heat to flow through; the first water pipe of the lower metal straight water pipes 62 is connected with a water inlet joint 8 for cold water inlet; the left and right ends of the lower-layer metal straight water pipes 62 penetrate out of the left wall plate and the right wall plate of the metal coaming frame and are welded and sealed, and the left wall plate and the right wall plate connected with the lower-layer metal straight water pipes 62 can be formed by one or two blocks; the number of the lower water pipe through holes is the same as that of the lower metal straight water pipes 62; 160-220 lower metal fins 61; the number of the lower-layer metal straight water pipes 62 is 3 to 5. The fin material of the lower layer metal fin 61 is made of stainless steel or copper or aluminum coating wrapping stainless steel; the lower metal straight water pipe 62 and the lower metal elbow 63 are made of stainless steel or copper; the lower metal straight pipe 62 and the lower metal elbow 63 are made of homogeneous materials. The lower fin type heat exchanger 6 has the advantages of mature production process, easy production and good heat exchange effect.

The upper fin type heat exchanger 5 comprises a plurality of upper metal fins 51, a plurality of upper metal straight water pipes 52 and a plurality of upper metal elbows 53, wherein a plurality of upper water pipe through holes are formed in the upper metal fins 51, the upper metal straight water pipes 52 directly penetrate through the upper water pipe through holes, the fins are connected in a stacked manner, the upper metal straight water pipes 52 and the upper metal fins 51 are connected into a whole through brazing, and the left ends and the right ends of the upper metal straight water pipes 52 are respectively welded with the upper metal elbows 53 in a staggered manner, so that the upper metal straight water pipes 52 and the upper metal elbows 53 are connected in series, and the upper metal straight water pipes 52 form unidirectional circulation; the upper metal fins 51 are provided with hot air flowing gaps, and the width of each hot air flowing gap is 2-3 mm and is used for allowing heat to flow through; the last water pipe of the upper metal straight water pipes 52 is connected with a water outlet joint 9 for discharging hot water; the left and right ends of the upper metal straight water pipes 52 penetrate out of the left wall plate and the right wall plate of the metal coaming frame and are welded and sealed, and the left wall plate and the right wall plate connected with the upper metal straight water pipes 52 can be formed by one or two blocks; the number of the upper water pipe through holes is the same as that of the upper metal straight water pipes 52; 160-220 upper metal fins 51; the number of the upper-layer metal straight water pipes 52 is 3 to 5. The fin material of the upper layer metal fin 51 is made of stainless steel or copper or aluminum coating wrapping stainless steel; the upper metal straight water pipe 52 and the upper metal elbow 53 are made of stainless steel or copper; the upper metal straight water pipe 52 and the upper metal elbow 53 are made of homogeneous materials. The upper fin type heat exchanger 5 has the advantages of mature production process, easy production and good heat exchange effect.

The last water pipe of the lower metal straight water pipes 62 and the first water pipe of the upper metal straight water pipes 52 are welded and connected with a communicating water channel through the water flow pipe fitting 10 to form series connection, so that the lower metal straight water pipes 62 and the inner water channels of the upper metal straight water pipes 52 form unidirectional flow; the upper metal straight water pipes 52 and the lower metal straight water pipes 62 cross the left and right plate walls of the middle section of the metal coaming frame 2 and are welded and connected with the plate walls in a sealing manner. Specific structure example 1 of the back-firing type combustion water heater:

the back-burning type combustion water heater belongs to the components of household gas water heater, and comprises an air-gas mixed gas electric suction device 1, a metal coaming frame 2, a combustion distributor 3 and an electronic ignition device 4; the inside of the metal coaming frame 2 is provided with a box cavity 21;

the air-gas mixed gas electric suction device 1 comprises a metal top plate 1A and an electric fan 1B, wherein the metal top plate 1A is in sealing connection with the top of a metal coaming frame 2; an air-gas mixed gas inlet hole 1C is formed in the middle of the metal top plate 1A, and the air outlet edge of the electric fan 1B is in sealing connection and communication with the air inlet hole 1C edge of the metal top plate 1A;

an ignition device is arranged above the box cavity 21; the ignition electrode of the ignition device electronic ignition device 4 is connected with the upper section side wall of the metal coaming frame 2 in a sealing mode and is close to the combustion distributor 3; the upper section side wall of the metal coaming frame 2 is connected with a flame detection device 16 in a sealing mode, and a detection head of the flame detection device 16 is close to the combustion distributor 3; the electronic ignition device 4 and the flame detection device 16 belong to the prior art products;

a combustion distributor 3 is arranged above the box cavity 21, and the combustion distributor 3 belongs to the prior art; the combustion distributor 3 is a mesh fire distributing shell, and the periphery of the edge of the mesh fire distributing shell is fixedly connected with the periphery of the inner wall above the combustion chamber 11 in a welding manner;

the middle section of the box cavity 21 is fixedly connected with a lower-layer fin type heat exchanger 6 and an upper-layer fin type heat exchanger 5, and the left end and the right end of the lower-layer fin type heat exchanger 6 and the upper-layer fin type heat exchanger 5 are in sealing connection with the side walls of the corresponding metal coaming frames 2; the fins of the lower fin type heat exchanger 6 and the fins of the upper fin type heat exchanger 5 are mutually independent;

the last water pipe of the lower-layer fin type heat exchanger 6 is connected with the first water pipe of the upper-layer fin type heat exchanger 5 to be communicated with a water channel, so that the lower-layer fin type heat exchanger 6 and the inner water channel of the upper-layer fin type heat exchanger 5 form unidirectional circulation;

a combustion chamber 11 is formed between the upper fin type heat exchanger 5 and the air-fuel gas mixed gas electric suction device 1, and a combustion distributor 3 and an electronic ignition device 4 are arranged above the combustion chamber 11;

the bottom of the metal coaming frame 2 is connected with a metal bottom plate 12 in a sealing way; a smoke collecting chamber 13 is formed between the metal bottom plate 12 and the lower fin type heat exchanger 6; the smoke collecting chamber 13 and the combustion chamber 11 belong to a part of the box cavity 21; the wall body in the range of the smoke collecting chamber 13 is provided with a smoke discharging hole 14, and the smoke discharging hole 14 is arranged at the lower section of the metal coaming frame 2;

the lower fin type heat exchanger 6 comprises a plurality of lower metal fins 61, five lower metal straight water pipes 62 and four lower metal elbows 63, wherein each lower metal fin 61 is provided with five lower water pipe through holes, the structures of the lower metal fins 61 are the same, the five lower metal straight water pipes 62 directly penetrate through the five lower water pipe through holes, the fins are connected in a stacked manner, the lower metal straight water pipes 62 and the lower metal fins 61 are welded into a whole, and two lower metal elbows 63 are welded at the left end and the right end of the five lower metal straight water pipes 62 in a staggered manner so that the five lower metal straight water pipes 62 form unidirectional circulation; the lower metal fins 61 are provided with hot air circulation gaps; the first water pipe of the five lower-layer metal straight water pipes 62 is connected with a water inlet joint 8;

the upper fin type heat exchanger 5 comprises a plurality of upper metal fins 51, five upper metal straight water pipes 52 and four upper metal elbows 53, wherein each upper metal fin 51 is provided with five upper water pipe through holes, the structures of the upper metal fins 51 are the same, the five upper metal straight water pipes 52 directly pass through the five upper water pipe through holes, the fins are connected in a stacked manner, the upper metal straight water pipes 52 are integrally welded with the upper metal fins 51, and two upper metal elbows 53 are welded at the left end and the right end of the five upper metal straight water pipes 52 in a staggered manner so that the five upper metal straight water pipes 52 form unidirectional circulation; hot air circulation gaps are arranged between the upper metal fins 51; the last water pipe of the five upper-layer metal straight water pipes 52 is connected with a water outlet joint 9;

the first water pipe of the five lower-layer metal straight water pipes 62 is connected with a water inlet joint 8; the last water pipe of the five upper-layer metal straight water pipes 52 is connected with a water outlet joint 9; the water inlet joint 8 and the water outlet joint 9 are arranged outside the metal coaming frame 2;

the last water pipe of the five lower-layer metal straight water pipes 62 and the first water pipe of the five upper-layer metal straight water pipes 52 are welded and connected with a communicating water channel through a water flow pipe fitting 10 in a sealing way, so that the five lower-layer metal straight water pipes 62 and the internal water channels of the five upper-layer metal straight water pipes 52 form unidirectional flow, cold water flows through each lower-layer metal straight water pipe 62 in a unidirectional way after entering from the water inlet joint 8, then flows to each upper-layer metal straight water pipe 52 through the water flow pipe fitting 10 again, and hot water after heat exchange flows out from the water outlet joint 9; five upper metal straight water pipes 52 and five lower metal straight water pipes 62 cross the middle section of the metal coaming frame 2 and are welded and connected with the coaming walls thereof in a sealing manner.

Specific structure example 2 of the back-firing type combustion water heater:

unlike the specific structural example 1 of the present back-firing type combustion water heater, the following are: the metal base plate 12 is provided with a condensed water hole 15.

Specific structure example 3 of the back-firing type combustion water heater:

unlike the specific structural example 1 of the present back-firing type combustion water heater, the following are: the smoke exhaust hole 14 is arranged on the metal bottom plate 12, and the smoke exhaust hole 14 is not arranged at the lower section of the metal coaming frame 2.

Application example 1:

a household gas water heater comprises an outer case A, a controller B, a smoke exhaust pipe C, a gas inlet electromagnetic valve control device D, a gas inlet joint pipe E, a water inlet joint pipe F and a water outlet joint pipe G, wherein the controller B is connected with the gas inlet electromagnetic valve control device D through wires; the front surface of the outer case A is fixedly connected with a controller B; one end of the gas inlet electromagnetic valve control device D is connected with a gas inlet joint pipe E, and the gas inlet joint pipe E penetrates out of the bottom of the outer box shell A downwards; the water inlet joint pipe F and the water outlet joint pipe G downwards penetrate out of the bottom of the outer box shell A;

the combustion air-fuel mixed gas electric suction device comprises an air-fuel gas mixed gas electric suction device 1, a metal coaming frame 2, a combustion distributor 3 and an electronic ignition device 4; the inside of the metal coaming frame 2 is provided with a box cavity 21; the top of the metal coaming frame 2 is connected with an air-fuel gas mixed gas electric suction device 1 in a sealing way; a combustion distributor 3 is arranged above the box cavity 21; an ignition device is arranged above the box cavity 21, and the ignition electrode of the electronic ignition device 4 is close to the combustion distributor 3; the middle section of the box cavity 21 is fixedly connected with a lower-layer fin type heat exchanger 6 and an upper-layer fin type heat exchanger 5, and the left end and the right end of the lower-layer fin type heat exchanger 6 and the upper-layer fin type heat exchanger 5 are in sealing connection with the side walls of the corresponding metal coaming frames 2; the fins of the lower fin type heat exchanger 6 and the fins of the upper fin type heat exchanger 5 are mutually independent; the first water pipe of the lower fin type heat exchanger 6 is connected with a water inlet joint 8; the last water pipe of the upper fin type heat exchanger 5 is connected with a water outlet joint 9; the last water pipe of the lower-layer fin type heat exchanger 6 and the first water pipe of the upper-layer fin type heat exchanger 5 are welded and connected with a communicating water channel through a water flow pipe fitting 10 in a sealing way, so that the lower-layer fin type heat exchanger 6 and the inner water channel of the upper-layer fin type heat exchanger 5 form unidirectional flow; the water inlet joint 8 and the water outlet joint 9 are arranged outside the metal coaming frame 2; a combustion chamber 11 is formed between the upper fin type heat exchanger 5 and the air-fuel gas mixed gas electric suction device 1, and a combustion distributor 3 and an electronic ignition device 4 are arranged above the combustion chamber 11; the bottom of the metal coaming frame 2 is connected with a metal bottom plate 12 in a sealing way; a smoke collecting chamber 13 is formed between the metal bottom plate 12 and the lower fin type heat exchanger 6; the smoke collecting chamber 13 and the combustion chamber 11 belong to a part of the box cavity 21; the wall body of the smoke collecting chamber 13 is provided with a smoke discharging hole 14, and the smoke discharging hole 14 is arranged at the lower section of the metal bottom plate 12 or the metal coaming frame 2.

The back-firing type combustion water heater is fixedly connected in the outer case A; the upper ends of the water inlet joint pipe F and the water outlet joint pipe G are connected with a water inlet joint 8 and a water outlet joint 9 of the corresponding inverted combustion water heater; a smoke discharging pipe C is closely and vertically connected at the smoke discharging hole 14 of the back-burning type combustion water heater, and penetrates out of the top of the outer box shell A; the gas inlet electromagnetic valve control device D is connected with the air inlet end of the air-gas mixed gas electric suction device 1 of the reverse combustion water heater; the air-gas mixed gas electric suction device 1 and the electronic ignition device 4 of the back-firing type combustion water heater are connected with the controller B through wires.

Application example 2:

a household gas water heater comprises an outer case A, a controller B, a smoke exhaust pipe C, a gas inlet electromagnetic valve control device D, a gas inlet joint pipe E, a water inlet joint pipe F, a water outlet joint pipe G, a water outlet temperature sensor H, an oxygen sensor I and a back-burning type combustion water heater; the outer case A is square and made of iron metal; the controller B is connected with the gas inlet electromagnetic valve control device D, the water outlet temperature sensor H and the oxygen sensor I through wires;

the front surface of the outer box shell A is fixedly connected with a controller B by a screw and is used for starting and adjusting the functions of the water heater; the water outlet temperature sensor H is connected with the water outlet joint pipe G in a penetrating way and is used for detecting the water outlet temperature; the back-firing type combustion water heater is fixedly connected in the outer case A;

the inside of the outer case A is fixedly connected with a reverse combustion type combustion water heater through screws, and the reverse combustion type combustion water heater comprises an air-gas mixed gas electric suction device 1, a metal coaming frame 2, a combustion distributor 3 and an electronic ignition device 4; the inside of the metal coaming frame 2 is provided with a box cavity 21; the air-gas mixed gas electric suction device 1 comprises a metal top plate 1A and an electric fan 1B, wherein the metal top plate 1A is in sealing connection with the top of a metal coaming frame 2; an air-gas mixed gas inlet hole 1C is formed in the middle of the metal top plate 1A, and the air outlet edge of the electric fan 1B is in sealing connection and communication with the air inlet hole 1C edge of the metal top plate 1A; an ignition device is arranged above the box cavity 21; the ignition electrode of the ignition device electronic ignition device 4 is connected with the upper section side wall of the metal coaming frame 2 in a sealing mode and is close to the combustion distributor 3; the upper section side wall of the metal coaming frame 2 is connected with a flame detection device 16 in a sealing mode, and a detection head of the flame detection device 16 is close to the combustion distributor 3; the electronic ignition device 4 and the flame detection device 16 belong to the prior art products; a combustion distributor 3 is arranged above the box cavity 21, and the combustion distributor 3 belongs to the prior art; the combustion distributor 3 is a mesh fire distributing shell, and the periphery of the edge of the mesh fire distributing shell is fixedly connected with the periphery of the inner wall above the combustion chamber 11 in a welding manner; the middle section of the box cavity 21 is fixedly connected with a lower-layer fin type heat exchanger 6 and an upper-layer fin type heat exchanger 5, and the left end and the right end of the lower-layer fin type heat exchanger 6 and the upper-layer fin type heat exchanger 5 are in sealing connection with the side walls of the corresponding metal coaming frames 2; the fins of the lower fin type heat exchanger 6 and the fins of the upper fin type heat exchanger 5 are mutually independent; the last water pipe of the lower-layer fin type heat exchanger 6 is connected with the first water pipe of the upper-layer fin type heat exchanger 5 to be communicated with a water channel, so that the lower-layer fin type heat exchanger 6 and the inner water channel of the upper-layer fin type heat exchanger 5 form unidirectional circulation; a combustion chamber 11 is formed between the upper fin type heat exchanger 5 and the metal top plate 1A, and a combustion distributor 3 and an electronic ignition device 4 are arranged above the combustion chamber 11; the bottom of the metal coaming frame 2 is connected with a metal bottom plate 12 in a sealing way; a smoke collecting chamber 13 is formed between the metal bottom plate 12 and the lower fin type heat exchanger 6; the smoke collecting chamber 13 and the combustion chamber 11 belong to a part of the box cavity 21; the wall body in the range of the smoke collecting chamber 13 is provided with a smoke discharging hole 14, and the smoke discharging hole 14 is arranged at the lower section of the metal coaming frame 2; the lower fin type heat exchanger 6 comprises a plurality of lower metal fins 61, five lower metal straight water pipes 62 and four lower metal elbows 63, wherein each lower metal fin 61 is provided with five lower water pipe through holes, the structures of the lower metal fins 61 are the same, the five lower metal straight water pipes 62 directly penetrate through the five lower water pipe through holes, the fins are connected in a stacked manner, the lower metal straight water pipes 62 and the lower metal fins 61 are welded into a whole, and two lower metal elbows 63 are welded at the left end and the right end of the five lower metal straight water pipes 62 in a staggered manner so that the five lower metal straight water pipes 62 form unidirectional circulation; the lower metal fins 61 are provided with hot air circulation gaps; the first water pipe of the five lower-layer metal straight water pipes 62 is connected with a water inlet joint 8; the upper fin type heat exchanger 5 comprises a plurality of upper metal fins 51, five upper metal straight water pipes 52 and four upper metal elbows 53, wherein each upper metal fin 51 is provided with five upper water pipe through holes, the structures of the upper metal fins 51 are the same, the five upper metal straight water pipes 52 directly pass through the five upper water pipe through holes, the fins are connected in a stacked manner, the upper metal straight water pipes 52 are integrally welded with the upper metal fins 51, and two upper metal elbows 53 are welded at the left end and the right end of the five upper metal straight water pipes 52 in a staggered manner so that the five upper metal straight water pipes 52 form unidirectional circulation; hot air circulation gaps are arranged between the upper metal fins 51; the last water pipe of the five upper-layer metal straight water pipes 52 is connected with a water outlet joint 9; the first water pipe of the five lower-layer metal straight water pipes 62 is connected with a water inlet joint 8; the last water pipe of the five upper-layer metal straight water pipes 52 is connected with a water outlet joint 9; the water inlet joint 8 and the water outlet joint 9 are arranged outside the metal coaming frame 2; the last water pipe of the five lower-layer metal straight water pipes 62 and the first water pipe of the five upper-layer metal straight water pipes 52 are welded and connected with a communicating water channel through the water flow pipe fitting 10 in a sealing way, so that the five lower-layer metal straight water pipes 62 and the internal water channels of the five upper-layer metal straight water pipes 52 form unidirectional flow; five upper metal straight water pipes 52 and five lower metal straight water pipes 62 cross the middle section of the metal coaming frame 2 and are connected with the coaming walls thereof in a sealing way;

the controller B is connected with the electronic ignition device 4, the electric fan 1B and the flame detection device 16 through wires; a smoke discharging pipe C is closely and vertically connected to the smoke discharging hole 14 and penetrates out of the top of the outer box shell A; the gas inlet electromagnetic valve control device D is in the prior art and is connected with an air inlet joint of the electric fan 1B, and the air inlet joint of the electric fan 1B is connected with an air inlet pipe fitting to be communicated with the outside to obtain air to enter; the gas inlet electromagnetic valve control device D is connected with a gas inlet joint pipe E, and the gas inlet joint pipe E penetrates out of the bottom of the outer box shell A downwards to be connected with the free end of an external gas pipe; the upper end of the water inlet joint pipe F is connected with the water inlet joint 8, and the lower end of the water inlet joint pipe F downwards passes out of the bottom of the outer box shell A and is a free end connected with an external tap water pipe; the upper end of the water outlet joint pipe G is connected with the water outlet joint 9, and the lower end of the water outlet joint pipe G downwards passes through the bottom of the outer box shell A and is a free end for connecting an external hot water outlet pipe; the oxygen sensor I is fixed on the metal coaming frame 2 in a penetrating way and extends into the smoke collecting chamber 13 for detecting the oxygen value after fuel gas; the condensed water hole 15 is connected with a drain pipe 151, and the lower end of the drain pipe 151 passes through the bottom of the outer box shell A downwards to be the free end connected with an external tap water pipe;

when the electric ignition device is used, the controller B controls the electronic ignition device 4 to ignite, the flame detection device 16 to detect flame, the fuel gas inlet electromagnetic valve control device D opens the inlet fuel gas, the electric fan 1B rotates to suck air and the sucked fuel gas to enter the combustion distributor 3 for combustion; the controller B controls the water outlet temperature sensor H and the oxygen sensor I to start detection work; the upper fin type heat exchanger 5 has the highest temperature receiving and is a main heater, and heated hot water flows out in the direction of the water outlet joint 9; the lower fin type heat exchanger 6 receives (absorbs) the waste heat air flow after the heat exchange of the upper fin type heat exchanger 5; the lower fin heat exchanger 6 is first filled with cold water, the body temperature of the lower fin heat exchanger 6 is lower, and the heat of the waste heat air flow of the upper layer is received (absorbed) more, so that the cold water flowing into and flowing through the lower fin heat exchanger 6 is preheated.

Claims (9)

1. A back-firing type combustion water heater comprises an air-gas mixed gas electric suction device, a metal coaming frame, a combustion distributor and an electronic ignition device;

the inside of the metal coaming frame is a box cavity;

the top of the metal coaming frame is connected with an air-gas mixed gas electric suction device in a sealing way; a combustion distributor is arranged above the box cavity; an electronic ignition device is arranged above the box cavity, and the ignition electrode of the electronic ignition device is close to the combustion distributor;

the method is characterized in that: the middle section of the box cavity is fixedly connected with a lower-layer fin type heat exchanger and an upper-layer fin type heat exchanger, and the left end and the right end of the lower-layer fin type heat exchanger and the upper-layer fin type heat exchanger are in sealing connection with the side walls of the corresponding metal coaming frames; the fins of the lower-layer fin type heat exchanger and the fins of the upper-layer fin type heat exchanger are mutually independent;

the first water pipe of the lower fin type heat exchanger is connected with a water inlet joint;

the last water pipe of the upper fin type heat exchanger is connected with a water outlet joint;

the last water pipe of the lower-layer fin type heat exchanger is connected with the first water pipe of the upper-layer fin type heat exchanger in a sealing way through a water flow through pipe fitting to form unidirectional circulation with the internal water channel of the upper-layer fin type heat exchanger;

the water inlet joint and the water outlet joint are arranged outside the metal coaming frame;

a combustion chamber is formed between the upper fin type heat exchanger and the air-fuel gas mixed gas electric suction device, and a combustion distributor and an electronic ignition device are arranged above the combustion chamber;

the bottom of the metal coaming frame is connected with a metal bottom plate in a sealing way;

a smoke collecting chamber is formed between the metal bottom plate and the lower fin type heat exchanger; the smoke collecting chamber and the combustion chamber belong to a part of the box cavity;

the wall body of the smoke collecting chamber is provided with a smoke discharging hole which is arranged at the lower section of the metal bottom plate or the metal coaming frame.

2. A reverse combustion water heater according to claim 1, wherein: the back surface of the air-fuel gas mixed gas electric suction device or the inner upper wall of the combustion chamber is fixedly connected with a combustion distributor.

3. A reverse combustion water heater according to claim 1, wherein: the air-gas mixed gas electric suction device comprises a metal top plate and an electric fan, wherein the metal top plate is connected with the top of the metal coaming frame in a sealing way; an air-gas mixed gas inlet hole is formed in the middle of the metal top plate, and an air outlet edge of the electric fan is in sealing connection and communication with an air-gas mixed gas inlet hole opening edge of the metal top plate.

4. A reverse combustion water heater according to claim 1, wherein: the upper section side wall of the metal coaming frame or the air-fuel gas mixed gas electric suction device is connected with an electronic ignition device in a sealing and penetrating way.

5. A reverse combustion water heater according to claim 1, wherein: the upper section side wall of the metal coaming frame or the air-gas mixed gas electric suction device is connected with a flame detection device in a sealing and penetrating way, and a detection head of the flame detection device is close to the combustion distributor.

6. A reverse combustion water heater according to claim 1, wherein: the combustion distributor is a mesh fire distributing shell, and the periphery of the edge of the mesh fire distributing shell is fixedly connected with the periphery of the inner wall above the combustion chamber.

7. A reverse combustion water heater according to claim 1, wherein: and condensed water holes are formed in the metal bottom plate.

8. A reverse combustion water heater according to claim 1, wherein: the lower fin type heat exchanger comprises a plurality of lower metal fins, a plurality of lower metal straight water pipes and a plurality of lower metal elbows, wherein a plurality of lower water pipe through holes are formed in the lower metal fins, the lower metal straight water pipes directly penetrate through the lower water pipe through holes, the fins are connected in a stacked manner, the lower metal straight water pipes are welded with the lower metal fins into a whole, and the lower metal elbows are welded at the left end and the right end of the lower metal straight water pipes in a staggered manner so that the lower metal straight water pipes form unidirectional circulation; hot air circulation gaps are arranged between the lower metal fins; the first water pipes of the lower metal straight water pipes are connected with water inlet connectors;

the upper-layer fin type heat exchanger comprises a plurality of upper-layer metal fins, a plurality of upper-layer metal straight water pipes and a plurality of upper-layer metal elbows, wherein a plurality of upper-layer water pipe through holes are formed in the upper-layer metal fins, the upper-layer metal straight water pipes directly penetrate through the upper-layer water pipe through holes, the fins are connected in a stacked manner, the upper-layer metal straight water pipes are welded with the upper-layer metal fins into a whole, and the upper-layer metal elbows are welded at the left end and the right end of the upper-layer metal straight water pipes in a staggered manner so that the upper-layer metal straight water pipes form unidirectional circulation; hot air circulation gaps are arranged between the upper metal fins; the last water pipe of the plurality of upper metal straight water pipes is connected with a water outlet joint;

the last water pipe of the lower-layer metal straight water pipes is connected with the first water pipe of the upper-layer metal straight water pipes to be communicated with the water channels, so that the lower-layer metal straight water pipes and the inner water channels of the upper-layer metal straight water pipes form unidirectional circulation;

the upper metal straight water pipes and the lower metal straight water pipes cross the middle section of the metal coaming frame and are connected with the coaming walls in a sealing way.

9. A household gas water heater comprises an outer case, a controller, a smoke exhaust pipe, a gas inlet electromagnetic valve control device, a gas inlet joint pipe, a water inlet joint pipe and a water outlet joint pipe, wherein the controller is connected with the gas inlet electromagnetic valve control device through wires; the front surface of the outer box shell is fixedly connected with a controller; one end of the gas inlet electromagnetic valve control device is connected with a gas inlet joint pipe, and the gas inlet joint pipe penetrates out of the bottom of the outer box shell downwards; the water inlet joint pipe and the water outlet joint pipe penetrate out of the bottom of the outer case shell downwards;

the method is characterized in that: comprising the reverse combustion type combustion water heater according to any one of claims 1 to 8, wherein the reverse combustion type combustion water heater is fixedly connected in the outer case; the upper ends of the water inlet joint pipe and the water outlet joint pipe are connected with the water inlet joint and the water outlet joint of the corresponding inverted combustion type combustion water heater; a smoke exhaust pipe is closely and vertically connected at the smoke exhaust hole of the back-burning type combustion water heater, and penetrates out of the top of the outer box shell; the gas inlet electromagnetic valve control device is connected with the air inlet end of the air-gas mixed gas electric suction device of the reverse combustion water heater; the air-gas mixed gas electric suction device of the back-firing type combustion water heater and the electronic ignition device are connected with the controller through wires.