CN217357549U

CN217357549U - Two-stage heat exchange intelligent multi-section combustion direct-supply water heater

Info

Publication number: CN217357549U
Application number: CN202221434456.5U
Authority: CN
Inventors: 王建强; 李苗
Original assignee: Wuhan Jianjin Energy Saving Technology R&d Co ltd
Current assignee: Wuhan Jianjin Energy Saving Technology R&d Co ltd
Priority date: 2022-06-07
Filing date: 2022-06-07
Publication date: 2022-09-02
Anticipated expiration: 2032-06-07

Abstract

The utility model discloses a two-stage heat exchange intelligent multi-section combustion direct supply type water heater; the utility model relates to a water heater technical field specifically includes the storage water tank of installation in the frame, and wherein the storage water tank divide into hot water storage water tank and heating water tank, and heating water tank's inside is provided with two heat exchangers of upper and lower structure installation, and one end of every heat exchanger respectively installs one rather than supporting convulsions forced draft fan and the honeycomb heat recovery tobacco pipe that uses. The utility model has the advantages that the water tank is used for storing water, and the water temperature in the hot water supply pipeline of the building can be realized by matching the variable frequency booster pump, the return water solenoid valve and the temperature detection probe; two independently designed gas heating systems cooperate with the flue gas heat recovery system used in match with the two independently designed gas heating systems and the independent control mechanism matched with each gas heating system, so that cold water can be rapidly heated, and the alternative work of the combustion system can be realized when hot water is at constant temperature, the continuous working time is reduced, and the service life of the gas heating systems can be prolonged to a certain extent.

Description

Two-stage heat exchange intelligent multi-section combustion direct-supply water heater

Technical Field

The utility model relates to a water heater technical field, concretely relates to two-stage heat transfer intelligence multistage burning direct-supplying type water heater.

Background

At present, most commercial gas water heaters supply water for external water storage, a circulating heating process is formed by pumping and pressurizing through an intermediate water pump, combining a combustor and a pipeline, when the water heater is used, the water storage tanks with different storage volumes can be selected as the hot water storage tank according to the requirements of the water heater, but the water heater, when in use, the hot water supply pipe completely depends on the gravity water pressure to enter the hot water supply pipeline of the building, the building hot water supply pipeline is provided with only one connector on the water storage tank, hot water only can not flow in the supply pipeline, if no one opens the water supply pipeline for a long time, the hot water in the pipeline can not flow, and is gradually cooled along with the time, when the water is used, the water is often discharged for a long time to discharge the hot water from the water faucet again, the method is undoubtedly a huge waste of water resources for the modern society advocating water conservation at present.

In addition, most of the known gas water heaters adopt a single combustion assembly for heating, the heating speed of cold water is low, and continuous time operation is required in the process of maintaining the water temperature, so that the use frequency of the burner assembly is too high, and the service life of the burner assembly is influenced.

SUMMERY OF THE UTILITY MODEL

To prior art's not enough, the utility model provides a two-stage heat transfer intelligence multistage burning directly supplies type water heater, this design possesses the advantage of circulation heating and multistage burning.

The utility model discloses a two-stage heat exchange intelligent multi-section combustion direct-supply water heater, which comprises a frame and a water storage tank arranged in the frame, wherein the water storage tank is divided into an upper part and a lower part, the upper part is a hot water storage tank, the lower part is a heating water tank, in order to realize the heating of the water body in the water storage tank, the hot water storage tank at the upper part and the heating water tank at the lower part adopt the structure design of upper and lower communication, so as to facilitate the new water which enters from a cold water receiving port and is primarily preheated through a honeycomb heat recovery smoke tube to flow from the bottom to the top of the heating water tank, drive the water body in the heating water tank to flow, two heat exchangers are arranged in the heating water tank, one end of each heat exchanger is respectively provided with a strong exhaust fan and a honeycomb heat recovery smoke tube which are matched with the heat exchanger, so that each heat exchanger is combined with the following burner assembly to form a complete heating and heat recovery system, make during later stage hot water keeps warm, can cooperate the PLC the control unit of the inside setting of gas intelligent control ware and total controller box, realize that two independent heating system carry out alternate work, avoid appearing the long-time continuity work of same combustor assembly, can greatly increase the life of this heater, and the burning heating system of two independent designs, and supporting heat recovery system of recycling, can effectively shorten the heat time of newly-feeding moisturizing when cold water heating, improve heating efficiency, make the gas utilization ratio effectively improve, reach energy-concerving and environment-protective purpose.

Two the one end that convulsions forced draught fan was kept away from to the honeycomb heat recovery tobacco pipe all is equipped with the exhaust port that supplies flue gas exhaust, and two exhaust ports are through a pipe intercommunication of discharging fume for concentrate the exhaust with the waste gas in two honeycomb heat recovery tobacco pipes.

The outer surface of the frame is also respectively provided with a hot water return port, a cold water inlet, a hot water outlet, a gas inlet and a power supply inlet, two ends of the honeycomb heat recovery smoke tube are respectively provided with a heat recovery water inlet and a heat recovery water outlet, the cold water inlet and the hot water return port are respectively provided with a water inlet electromagnetic valve and a water return electromagnetic valve, the water inlet electromagnetic valve is respectively communicated with the heat recovery water inlets on the two honeycomb heat recovery smoke tubes by matching with a heat recovery water inlet tube through a three-way joint, the water return electromagnetic valve is communicated with the inside of the hot water storage tank from the top of the hot water storage tank through a water return tube, the heat recovery water outlets on the two honeycomb heat recovery smoke tubes are communicated with the bottom of the heating water tank through a heat recovery water tank connecting tube, the bottom of the frame is provided with a variable frequency booster pump, and the booster pump water inlets and booster pump water outlets of the variable frequency booster pump are both communicated with the bottom of the hot water storage tank through a water hot water outlet tube and the hot water outlet tube of the hot water storage tank, thus, a closed hot water supply circulation system can be formed by means of an external hot water supply pipeline.

As a further improvement of the utility model, in order to ensure that the heating and heat recovery system composed of each heat exchanger can work independently, a gas proportional valve, a gas intelligent controller and a burner assembly which are matched with the heat exchanger for use are arranged in the frame; the water level sensor is arranged on the inner side of the top of the hot water storage tank, two burner assemblies and two gas proportional valves are respectively arranged on inlets of combustion chambers of two heat exchangers, the two gas proportional valves are matched with a gas pipe through a three-way joint and are communicated with the gas inlet, the two gas proportional valves are also respectively communicated with one burner assembly through the gas pipe to supply gas to the burner assemblies, the two heating systems can work independently, a user can select the working condition of the heating system according to actual practical requirements, such as the working of one heating system or the simultaneous working of the two heating systems, and the like, so that the energy-saving effect can be achieved to a certain extent, in order to facilitate the cleaning of scale in the storage tank, the water body in the storage tank is ensured to be clear, one side of the heating tank is provided with a scale removal window with a sealing door, so as to be used for the descaling operation of workers.

As the utility model discloses a further improvement, for convenient opening and close of two combustor assemblies, respectively establish one, two for every combustor assembly that the gas intelligent control ware is supporting gas intelligent control ware respectively with a combustor assembly and gas proportional valve signal connection for control every combustor assembly's user state, two gas intelligent control ware all installs in the master control box, the master control box is fixed in frame one side, and the inside PLC the control unit who is used for controlling return water solenoid valve, the solenoid valve of intaking, frequency conversion booster pump and opens and close that is provided with of master control box.

In order to implement the temperature that detects in the external hot water supply pipe way, the design of cooperation frequency conversion booster pump is in order to ensure the hot water that hot water pipe is interior to be carved with enough temperature, has temperature detecting probe at return water solenoid valve internally mounted, temperature detecting probe and level sensor all are connected with the inside PLC the control unit electricity that sets up of total controller box, and when temperature detecting probe detected in the pipeline temperature low excessively, return water solenoid valve and frequency conversion booster pump opened in step, through the pressure boost output of frequency conversion booster pump, carry the inside hot water of hot water storage water tank to the peripheral hardware hot water supply pipe in, will originally flow back to the interior low temperature water of hot water supply pipe way again and heat in the water storage tank.

As a further improvement, the air intake of the forced draft fan is in fixed butt joint with the heat exchanger air outlet, and the fixed grafting of the outlet flue of the forced draft fan lies in on the inlet flue of the honeycomb heat recovery tobacco pipe that it corresponds, the outlet flue of the forced draft fan is 90 degrees contained angles with the vertical plane of heating water tank, be 90 degrees contained angles between the tobacco pipe body of honeycomb heat recovery tobacco pipe and the vertical plane of heating water tank.

In order to enable new supplementary cold water to effectively implement cooling on high-temperature smoke of the honeycomb heat recovery smoke tube and reduce smoke emission temperature, the heat recovery effect is synchronously achieved in the process, the new supplementary cold water is preheated, the flue which is independent and used for smoke circulation is arranged in the honeycomb heat recovery smoke tube, the outer portion of the flue is provided with a water passing channel through which the cold water flows, when the cold water flows through the water passing channel, the cooling can be effectively implemented on the flue, heat exchange is achieved, the time for heating the whole cold water is shortened, the fuel gas utilization rate is improved, and the energy-saving effect is achieved.

As the utility model discloses a further improvement, for the coordinated control of convenient equipment, with convulsions forced draft fan, the solenoid valve of intaking, the frequency conversion booster pump, the return water solenoid valve, the gas proportional valve, the circuit of opening and close of gas intelligent control ware and combustor assembly all is connected with the inside PLC the control unit electricity of total accuse machine box, and total accuse machine box inside still is equipped with supply circuit moreover, supply circuit is connected with PLC the control unit and power entry electricity respectively to the unified supervisory control of convenient equipment power supply.

As a further improvement of the utility model, the outer side of the frame is fixedly connected with a framework, and the inner side of the framework is provided with a hinged plate for adjustment, thereby increasing the structural strength of the outer side of the frame, the two hinged plates can be matched with each other and change the angle to be matched with a wall corner or a wall surface, so that the selectivity of the installation place of the device is increased, rectangular grooves are integrally formed at the top and the bottom of the back of the framework, the rectangular grooves are vertically and symmetrically distributed by taking the center of the framework as an original point, sliding grooves are formed at the top and the bottom of the inner wall of each rectangular groove, two hinge plates are arranged, and the left and right sides of the top and bottom of the hinged plate are fixedly connected with sliding blocks, the hinged plate is connected between two opposite sliding chutes in a sliding manner through the sliding blocks, during other states, the hinged plate can be normally accommodated into the rectangular groove through the sliding block, the occupied space of the hinged plate is reduced, and the device is convenient to integrally store or transport.

Compared with the prior art, the beneficial effects of the utility model are as follows:

the utility model discloses from taking the water tank water storage, cooperate in it by frequency conversion booster pump, return water solenoid valve and the temperature detection probe that sets up in it, with the help of wet return and water tank hot water outlet pipe, collocate the building hot water and supply return water pipe-line system again, can realize the water supply circulation of building hot water supply pipe way to guarantee the temperature in the water supply pipe; when using water, need not to turn on the water for a long time, reduce unnecessary waste of water resource, and the gas heating system of two independent designs, the cooperation is rather than the supporting independent control mechanism of the flue gas heat recovery system and each gas heating system of collocation use, and the coordinated control of total accuse machine box, can realize each combustion system's independence or coordinate synchronous working, with this quick heating that realizes cold water, and combustion system's alternative work when hot water is constant temperature, it is long when reducing continuous operation, certain protection effect has to the combustor assembly, can prolong its life to a certain extent.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

FIG. 1 is a schematic front sectional view of the present invention;

FIG. 2 is a left side sectional view of the present invention;

FIG. 3 is a right side sectional view of the present invention;

FIG. 4 is a front view of the present invention with a partial cross-sectional structure;

fig. 5 is a schematic top view of the cross-sectional structure of the present invention;

fig. 6 is a schematic view of the back sectional structure of the present invention.

In the figure: 1. a hot water storage tank; 2. a main controller box; 3. a hot water return port; 4. air draft forced-ventilated fan; 5. a honeycomb heat recovery smoke tube; 6. a heat recovery water inlet pipe; 7. a water inlet electromagnetic valve; 8. a cold water inlet; 9. a hot water outlet; 10. a gas inlet; 11. a power inlet; 12. a water inlet of the booster pump; 13. a water outlet of the booster pump; 14. a variable frequency booster pump; 15. a smoke outlet; 16. a heat recovery water tank connecting pipe; 17. a heat exchanger; 18. a water return pipe; 19. a water return electromagnetic valve; 20. a hot water outlet pipe of the water tank; 21. descaling a window; 22. a gas proportional valve; 23. a gas intelligent controller; 24. a burner assembly; 25. heating the water tank; 26. a heat recovery water outlet; 27. a heat recovery water inlet; 28. a water level sensor; 29. a framework; 30. a hinge plate; 31. a chute; 32. a slide block.

Detailed Description

In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It should be understood, however, that these physical details should not be taken to limit the invention. That is, in some embodiments of the invention, these physical details are not necessary. In addition, for simplicity, some conventional structures and components are shown in a simplified schematic manner in the drawings.

In addition, the descriptions related to "first", "second", etc. in the present invention are only for description purposes, not specifically referring to the order or sequence, and are not intended to limit the present invention, but only to distinguish the components or operations described in the same technical terms, and are not to be construed as indicating or implying any relative importance or implicit indication of the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

Referring to fig. 1-6, the utility model relates to a two-stage heat exchange intelligent multi-stage combustion direct-supply water heater, which comprises a frame and a water storage tank installed in the frame, wherein the water storage tank is divided into an upper part and a lower part, the upper part is a hot water storage tank 1, the lower part is a heating water tank 25, in order to heat the water in the water storage tank, the upper hot water storage tank 1 and the lower heating water tank 25 adopt a structure design of upper and lower communication, so as to facilitate the new water supply entering from a cold water receiving port and primarily preheating through a honeycomb heat recovery smoke tube 5, the new water supply flows from the bottom to the top of the heating water tank 25, the water in the heating water tank 25 is driven to flow, two heat exchangers 17 are arranged in the heating water tank 25, one end of each heat exchanger 17 is respectively provided with an air draft strong exhaust fan 4 and a honeycomb heat recovery smoke tube 5 which are matched with the heat exchanger 17, so that each heat exchanger 17 is combined with the following burner assembly 24, constitute a complete heating and heat recovery system, when making later stage hot water keep warm, can cooperate the PLC the control unit of gas intelligent control ware 23 and the inside setting of total control machine box 2, realize that two independent heating system carry out alternating work, avoid appearing the long-time continuity work of same combustor assembly 24, can greatly increase the life of this heater, and the combustion heating system of two independent designs, and supporting heat recovery system of recycling, can effectively shorten the heat time of newly-advancing moisturizing when cold water heating, improve heating efficiency, make the gas utilization ratio obtain effectively improving, reach energy-concerving and environment-protective purpose.

Referring to fig. 3, one end of each of the two honeycomb heat recovery smoke tubes 5 away from the strong exhaust fan 4 is provided with a smoke outlet 15 for discharging smoke, the two smoke outlets 15 are connected through a smoke discharge tube for discharging the waste gas in the two honeycomb heat recovery smoke tubes 5 in a concentrated manner, the outer surface of the frame is further provided with a hot water return port 3, a cold water inlet 8, a hot water outlet 9, a fuel gas inlet 10 and a power supply inlet 11, the two ends of the honeycomb heat recovery smoke tube 5 are provided with a heat recovery water inlet 27 and a heat recovery water outlet 26, the cold water inlet 8 and the hot water return port 3 are respectively provided with a water inlet solenoid valve 7 and a water return solenoid valve 19, the water inlet solenoid valve 7 is connected with the heat recovery water inlet 27 of the two honeycomb heat recovery smoke tubes 5 through a tee joint in cooperation with the heat recovery water inlet tube 6, the water return solenoid valve 19 is connected with the inside of the hot water storage tank 1 from the top through a return tube 18, the heat recovery water outlets 26 on the two honeycomb heat recovery smoke pipes 5 are communicated with the bottom of the heating water tank 25 through the heat recovery water tank connecting pipe 16, the variable frequency booster pump 14 is installed at the bottom of the frame, the booster pump water inlet 12 and the booster pump water outlet 13 of the variable frequency booster pump 14 are communicated with the hot water outlet 9 and the bottom of the hot water storage tank 1 through the water tank hot water outlet pipe 20, and therefore a closed hot water supply circulating system can be formed through an external hot water supply pipeline.

Referring to fig. 2, in order to ensure that the heating and heat recovery system formed by each heat exchanger 17 can work independently, a gas proportional valve 22, a gas intelligent controller 23 and a burner assembly 24 which are used in cooperation with the heat exchanger 17 are installed in the frame; the water level sensor 28 is arranged on the inner side of the top of the hot water storage tank 1, two burner assemblies 24 and two gas proportional valves 22 are respectively arranged, the two burner assemblies 24 are respectively and correspondingly arranged on inlets of combustion chambers of two heat exchangers 17, the two gas proportional valves 22 are communicated with a gas inlet 10 through a three-way joint matched with a gas pipe, the two gas proportional valves 22 are also respectively communicated with one burner assembly 24 through the gas pipe to supply gas to the burner assemblies, the two heating systems can work independently, a user can select working conditions of the heating systems according to actual practical requirements, such as one heating system working or two heating systems working simultaneously and the like, the energy-saving effect can be achieved to a certain extent, in order to conveniently clean scale in the storage tank, the water in the storage tank is ensured to be clear, one side of the heating tank 25 is provided with a scale removal window 21 with a sealing door, so as to be used for the descaling operation of workers.

Please refer to fig. 2, in order to facilitate the opening and closing of the two burner assemblies 24, one is respectively provided for each burner assembly 24 matched with the gas intelligent controller 23, the two gas intelligent controllers 23 are respectively in signal connection with one burner assembly 24 and the gas proportional valve 22 for controlling the use state of each burner assembly 24, the two gas intelligent controllers 23 are all installed in the main controller box 2, the main controller box 2 is fixed on one side of the frame, and the main controller box 2 is internally provided with a PLC control unit for controlling the opening and closing of the water return solenoid valve 19, the water inlet solenoid valve 7 and the variable frequency booster pump 14.

Please refer to fig. 5, in order to detect the water temperature in the external hot water supply pipeline, the design of the variable frequency booster pump 14 is matched to ensure that the hot water in the hot water pipeline is always heated to a sufficient water temperature, a temperature detection probe is installed inside the water return electromagnetic valve 19, the temperature detection probe and the water level sensor 28 are electrically connected with the PLC control unit arranged inside the main controller box 2, when the temperature detection probe detects that the water temperature in the pipeline is too low, the water return electromagnetic valve 19 and the variable frequency booster pump 14 are synchronously opened, the booster output through the variable frequency booster pump 14, the hot water in the hot water storage tank 1 is conveyed to the external hot water supply pipeline, and the low-temperature water in the original hot water supply pipeline flows back to the water storage tank again to be heated.

Referring to fig. 3, an air inlet of the forced draft fan 4 is fixedly butted with an air outlet of the heat exchanger 17, a smoke outlet of the forced draft fan 4 is fixedly inserted into a smoke inlet of the honeycomb heat recovery flue pipe 5 corresponding to the smoke outlet, a 90-degree included angle is formed between the smoke outlet of the forced draft fan 4 and a vertical surface of the heating water tank 25, and a 90-degree included angle is formed between a flue pipe body of the honeycomb heat recovery flue pipe 5 and the vertical surface of the heating water tank 25, so that the new supplementary cold water can effectively cool the high-temperature flue gas of the honeycomb heat recovery flue pipe 5 and reduce the flue gas emission temperature, the heat recovery effect is synchronously realized in the process, the new supplementary cold water is preheated, an independent flue for flue gas circulation is arranged inside the honeycomb heat recovery flue pipe 5, a water passage for cold water to flow through is spirally wound outside the flue, and the cold water can effectively cool the flue when flowing through the water passage, realize the heat exchange, reduce the whole required time of cold water heating, improve the gas utilization ratio, reach energy-conserving effect, heat recovery delivery port 26 communicates respectively at water channel's both ends with heat recovery water inlet 27, be connected with the waterway pipe-line system of peripheral hardware between hot water return water mouth 3 and the hot water delivery port 9, for the convenient coordinated control of equipment, with convulsions forced draft fan 4, water inlet solenoid valve 7, frequency conversion booster pump 14, return water solenoid valve 19, gas proportional valve 22, the open and close circuit of gas intelligent control ware 23 and combustor assembly 24 all is connected with the PLC the control unit electricity of total controller box 2 inside, and total controller box 2 inside still is equipped with supply circuit, supply circuit is connected with PLC the control unit and power entry 11 electricity respectively, in order to make things convenient for the unified supervisory control of equipment power supply.

Referring to fig. 6, a frame 29 is fixedly connected to the outer side of the frame, and a hinge plate 30 for adjustment is provided on the inner side of the frame 29, so that the structural strength of the outer side of the frame is increased, the two hinged plates 30 can be matched with each other and change the angle to be matched with the wall corner or the wall surface, so that the selectivity of the installation place of the device is increased, rectangular grooves are integrally formed at the top and the bottom of the back surface of the framework 29, the rectangular grooves are vertically and symmetrically distributed by taking the center of the framework 29 as the original point, sliding grooves 31 are formed at the top and the bottom of the inner wall of each rectangular groove, the number of the hinged plates 30 is two, and the left and right sides of the top and bottom of the hinged plate 30 are fixedly connected with sliding blocks 32, the hinged plate 30 is connected between two opposite sliding grooves 31 in a sliding way through the sliding blocks 32, in other states, the hinged plate 30 can be normally accommodated in the rectangular groove through the sliding block 32, so that the occupied space of the hinged plate 30 is reduced, and the whole device is convenient to store or transport.

Through the honeycomb heat recovery smoke tube 5 and the internal water passing channel, the heat exchanger 17, the air draft forced draft fan 4 and the heat recovery water inlet tube 6 are matched, secondary heat recovery can be carried out on high-temperature smoke generated by the heat exchanger 17 in operation, meanwhile, cold water is re-added into the water storage tank, heat exchange is realized in the honeycomb heat recovery smoke tube 5 and the high-temperature smoke directly along the heat recovery water inlet tube 6 and the water passing channel, the preheating effect is realized, the utilization rate of gas combustion is increased, the energy-saving and environment-friendly effects are realized, the water level sensor 28 can play a role in water shortage protection for the water level in the water storage tank, the auxiliary water inlet electromagnetic valve 7 realizes the automatic water replenishing effect, the temperature detection probe can realize the automatic water replenishing effect by detecting the water temperature in the external water supply pipeline by means of the opening of the control water return electromagnetic valve 19 of the master controller box and the variable frequency booster pump 14, the water in the external water supply pipeline can be heated in a backflow manner, hot water in the hot water storage tank 1 is input into the external water supply pipeline again to ensure that the internal of the external water supply pipeline can be kept in a hot water state all the time, and meanwhile, a control unit in the control box 2 can synchronously coordinate the opening degree of the gas proportional valve 22 according to a water temperature signal to achieve the purpose of adjusting the power of the burner.

The above description is only an embodiment of the present invention, and is not intended to limit the present invention. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, or improvement made by the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. The utility model provides a two-stage heat transfer intelligence multistage burning direct-feeding type water heater, includes the storage water tank of installation in frame and the frame, and wherein the storage water tank divide into upper and lower two parts, and upper portion is hot water storage water tank (1), and the lower part is heating water tank (25), its characterized in that: two heat exchangers (17) which are arranged in an upper structure and a lower structure are arranged in the heating water tank (25), one end of each heat exchanger (17) is respectively provided with an air draft strong exhaust fan (4) and a honeycomb heat recovery smoke tube (5) which are matched with the heat exchangers for use, and one end, far away from the air draft strong exhaust fan (4), of each honeycomb heat recovery smoke tube (5) is provided with a smoke outlet (15) for discharging smoke, and the two smoke outlets (15) are communicated through a smoke exhaust tube;

the outer surface of the frame is also respectively provided with a hot water return port (3), a cold water inlet (8), a hot water outlet (9), a fuel gas inlet (10) and a power supply inlet (11);

two ends of the honeycomb heat recovery smoke pipe (5) are respectively provided with a heat recovery water inlet (27) and a heat recovery water outlet (26), the cold water inlet (8) and the hot water return port (3) are respectively provided with a water inlet electromagnetic valve (7) and a water return electromagnetic valve (19), the water inlet electromagnetic valve (7) is matched with the heat recovery water inlet pipe (6) through a three-way joint and is respectively communicated with the heat recovery water inlets (27) on the two honeycomb heat recovery smoke pipes (5), and the water return electromagnetic valve (19) is communicated with the inside of the hot water storage tank (1) from the top of the hot water storage tank through a water return pipe (18);

the heat recovery water outlets (26) on the two honeycomb heat recovery smoke pipes (5) are communicated with the bottom of the heating water tank (25) through a heat recovery water tank connecting pipe (16);

the utility model discloses a booster pump of frequency conversion booster pump (14) is installed to the frame bottom, booster pump water inlet (12) and booster pump delivery port (13) of frequency conversion booster pump (14) all communicate with the bottom of hot water delivery port (9) and hot water storage water tank (1) through water tank hot water outlet pipe (20).

2. The two-stage heat exchange intelligent multi-section combustion direct-supply water heater according to claim 1, characterized in that: a gas proportional valve (22), a gas intelligent controller (23) and a burner assembly (24) which are matched with the heat exchanger (17) are arranged in the frame; the top inboard of hot water storage water tank (1) is equipped with level sensor (28), combustor assembly (24) and gas proportional valve (22) respectively have two, two combustor assembly (24) correspond respectively and install on the combustion chamber entry of two heat exchangers (17), two gas proportional valve (22) are through three way connection cooperation gas pipe and gas entry (10) intercommunication, and two gas proportional valve (22) still communicate its air feed with a combustor assembly (24) respectively through the gas pipe, one side of heating water tank (25) is equipped with scale removal window (21) of taking sealing door.

3. The two-stage heat exchange intelligent multi-section combustion direct-supply water heater according to claim 2, characterized in that: gas intelligent control ware (23) have two, two gas intelligent control ware (23) are separately with a combustor assembly (24) and gas proportional valve (22) signal connection, two gas intelligent control ware (23) are all installed in total control box (2), total control box (2) are fixed in frame one side, and total control box (2) inside be provided with be used for controlling return water solenoid valve (19), water solenoid valve (7), the PLC the control unit that frequency conversion booster pump (14) opened and close.

4. The two-stage heat exchange intelligent multi-section combustion direct supply type water heater according to claim 1, characterized in that: the temperature detection probe is arranged in the water return electromagnetic valve (19), and the temperature detection probe and the water level sensor (28) are electrically connected with a PLC control unit arranged in the master control box (2).

5. The two-stage heat exchange intelligent multi-section combustion direct-supply water heater according to claim 1, characterized in that: an air inlet of the forced draft fan (4) is fixedly butted with an air outlet of the heat exchanger (17), and a smoke outlet of the forced draft fan (4) is fixedly spliced on a smoke inlet of the honeycomb heat recovery smoke tube (5) corresponding to the smoke outlet;

the smoke outlet of the strong exhaust fan (4) is 90-degree included angle with the vertical surface of the heating water tank (25), and a 90-degree included angle is formed between the smoke pipe body of the honeycomb heat recovery smoke pipe (5) and the vertical surface of the heating water tank (25).

6. The two-stage heat exchange intelligent multi-section combustion direct supply type water heater according to claim 1, characterized in that: the honeycomb heat recovery smoke tube (5) is internally provided with an independent flue used for smoke circulation and a water passing channel spirally wound outside the flue and used for cold water to flow through, and the heat recovery water outlet (26) and the heat recovery water inlet (27) are respectively communicated with two ends of the water passing channel.

7. The two-stage heat exchange intelligent multi-section combustion direct-supply water heater according to claim 1, characterized in that: an external waterway pipeline system is connected between the hot water return port (3) and the hot water outlet (9), and the upper hot water storage tank (1) is communicated with the lower heating water tank (25) up and down.

8. The two-stage heat exchange intelligent multi-section combustion direct supply type water heater according to claim 1, characterized in that: air draft forced draft fan (4), water inlet solenoid valve (7), frequency conversion booster pump (14), return water solenoid valve (19), gas proportional valve (22), gas intelligent control ware (23) and combustor assembly (24) all are connected with the inside PLC the control unit electricity of master control box (2), master control box (2) inside still is equipped with supply circuit, and supply circuit is connected with PLC the control unit and power entry (11) electricity respectively.

9. The two-stage heat exchange intelligent multi-section combustion direct-supply water heater according to claim 1, characterized in that: the outside fixedly connected with skeleton (29) of frame, and the inboard of skeleton (29) is provided with articulated slab (30) that the regulation was used, the top and the bottom integrated into one piece at the skeleton (29) back have a rectangle recess, and the rectangle recess uses the center of skeleton (29) to be upper and lower symmetric distribution as the original point, and spout (31) have all been seted up to the top and the bottom of rectangle recess inner wall, articulated slab (30) have two, and the equal fixedly connected with slider (32) of the left and right sides of articulated slab (30) top and bottom, articulated slab (30) are through slider (32) sliding connection between two relative spout (31).