Efficient condensation type gas volumetric water heater

Abstract

The utility model provides an efficient condensation type fuel gas volumetric water heater, and relates to the technical field of water heaters, the efficient condensation type fuel gas volumetric water heater comprises a shell, a condensation cover is arranged in the shell, an inner container barrel is arranged in an inner cavity of the condensation cover, and an upper cover seal head and a lower cover seal head are fixedly arranged at the two open ends of the inner container barrel respectively; an annular smoke channel is formed between the outer side wall of the inner container barrel and the inner side wall of the condensation cover, a first communicating smoke cavity is formed between the outer wall of the upper cover end socket and the inner wall of the upper portion of the condensation cover, and a second communicating smoke cavity is formed between the outer wall of the lower cover end socket and the inner wall of the lower portion of the condensation cover. Smoke sequentially flows through the main heat exchange smoke pipe, the third communicating smoke cavity, the secondary heat exchange smoke pipe, the first communicating smoke cavity, the annular smoke channel, the second communicating smoke cavity and the condensation smoke exhaust pipe connector, high-temperature smoke flows through the smoke pipe in the inner container and completely wraps the inner container, and therefore the heat exchange efficiency is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of water heaters, in particular to a high-efficiency condensing gas volumetric water heater. BACKGROUND

[0002] The condensing gas volumetric water heater is a high-efficiency energy-saving hot water supply device. By using condensation technology, water vapor in high-temperature flue gas is condensed into water, and latent heat of vaporization is released, thereby improving thermal efficiency and reducing energy consumption. At the same time, a high-precision temperature control system is provided, which can control the water temperature within a very small fluctuation range, providing users with a comfortable hot water experience. In addition, it also has various safety protection devices, such as flameout protection, overheating protection, and leakage protection, to ensure the safety and reliability of the use process.

[0003] The existing condensing gas volumetric water heater only exchanges heat through the vertically arranged flue pipe, and the heat exchange area is small, resulting in low heat exchange efficiency of the water heater. CONTENT OF THE INVENTION

[0004] The application provides a high-efficiency condensing gas volumetric water heater, which comprises a closed cylinder for storing cold water, a closed cylinder arranged in a shell, and an annular flue gas passage formed between the closed cylinder and the shell. The closed cylinder is provided with a main heat exchange flue pipe, a secondary heat exchange flue pipe, and a third communication flue cavity. The flue gas flows through the main heat exchange flue pipe, the third communication flue cavity, the secondary heat exchange flue pipe, the annular flue gas passage, and the condensing flue gas discharge pipe interface in sequence, heating the closed cylinder, the main heat exchange flue pipe, and the secondary heat exchange flue pipe, and then exchanging heat with the cold water. The water heater provided by the application increases the heat exchange area with the cold water, thereby improving the heat exchange efficiency and solving the problem of small heat exchange area and low heat exchange efficiency of the existing water heater.

[0005] The application provides a high-efficiency condensing gas volumetric water heater, which comprises a shell, a condensing cover arranged in the shell, and an inner container assembly arranged in the condensing cover. The inner container assembly is provided with a combustion control system and a water inlet and outlet assembly.

[0006] The condensing cover is provided with an inner cavity, and the top of the condensing cover is provided with an assembly hole. The inner container assembly comprises an inner container cylinder, an upper cover head, a lower cover head, a heat preservation filter cover, a main heat exchange flue pipe, a secondary heat exchange flue pipe, and a condensing flue gas discharge pipe interface.

[0007] The inner container cylinder is arranged in the inner cavity of the condensing cover. The upper cover head and the lower cover head are respectively fixedly arranged at the two open ends of the inner container cylinder. The upper cover head, the inner container cylinder, and the lower cover head enclose a water storage cavity.

[0008] An annular flue gas passage is formed between the outer side wall of the inner liner cylinder and the inner side wall of the condensing cover, a first communicating flue chamber is formed between the outer wall of the upper cover head and the upper inner wall of the condensing cover, a second communicating flue chamber is formed between the outer wall of the lower cover head and the lower inner wall of the condensing cover, and the first communicating flue chamber, the annular flue gas passage and the second communicating flue chamber are sequentially communicated;

[0009] The heat preservation filter cover is fixed to the side of the lower cover head opposite to the upper cover head, and the heat preservation filter cover and the lower cover head enclose a third communicating flue chamber, and the condensed water in the third communicating flue chamber penetrates the heat preservation filter cover and enters the second communicating flue chamber;

[0010] One end of the main heat exchange flue pipe is communicated with the assembly hole of the condensing cover, and the other end of the main heat exchange flue pipe sequentially penetrates the upper cover head, the water storage cavity and the lower cover head, and is communicated with the third communicating flue chamber;

[0011] One end of the secondary heat exchange flue pipe penetrates the lower cover head and is communicated with the third communicating flue chamber, and the other end of the secondary heat exchange flue pipe penetrates the water storage cavity and the upper cover head and is communicated with the first communicating flue chamber;

[0012] The condensing flue gas discharge pipe interface is fixed to the condensing cover, one end of the condensing flue gas discharge pipe interface is communicated with the second communicating flue chamber, and the other end penetrates the outer shell;

[0013] The combustion control system is arranged in the main heat exchange flue pipe, and the flue gas generated by combustion sequentially flows through the main heat exchange flue pipe, the third communicating flue chamber, the secondary heat exchange flue pipe, the first communicating flue chamber, the annular flue gas passage, the second communicating flue chamber and the condensing flue gas discharge pipe interface.

[0014] In a feasible implementation, the condensing cover and the inner liner cylinder are both cylindrical structures, and the condensing cover is coaxially arranged with the inner liner cylinder;

[0015] When the high-temperature flue gas flows through the main heat exchange flue pipe and / or the secondary heat exchange flue pipe, the high-temperature flue gas passes through the inner liner assembly, and when the high-temperature flue gas flows through the condensing cover, the high-temperature flue gas completely wraps the inner liner assembly.

[0016] In a feasible implementation, the water inlet and outlet assembly includes a water inlet pipe and a water outlet pipe;

[0017] The water inlet pipe is fixedly connected with the inner liner cylinder and the condensing cover, one end of the water inlet pipe is communicated with the water storage cavity, and the other end penetrates the outer shell and is connected with an external pipeline;

[0018] The water outlet pipe is fixedly connected with the inner container cylinder and the condensing cover, one end of the water outlet pipe is communicated with the water storage cavity, and the other end penetrates through the shell and is connected with an external pipeline;

[0019] The water inlet pipe and the water outlet pipe are located on the same side of the shell.

[0020] In a feasible implementation, the water inlet and outlet assembly further comprises a blowdown pipe;

[0021] The blowdown pipe is fixedly connected with the inner container cylinder and the condensing cover, one end of the blowdown pipe is communicated with the water storage cavity, and the other end penetrates through the shell and is connected with an external pipeline.

[0022] In a feasible implementation, the water inlet and outlet assembly further comprises a pressure relief water pipe;

[0023] The pressure relief water pipe is fixedly connected with the inner container cylinder and the condensing cover, one end of the pressure relief water pipe is communicated with the water storage cavity, and the other end penetrates through the shell and is connected with an external pipeline.

[0024] The blowdown pipe and the pressure relief water pipe are located on the same side of the shell.

[0025] In a feasible implementation, the combustion control system comprises a burner and a control assembly;

[0026] The control assembly is arranged in the inner cavity of the shell;

[0027] The burner is connected with the control assembly, and the burner extends into the main heat exchange flue through the assembly hole.

[0028] In a feasible implementation, the combustion control system further comprises a connecting piece;

[0029] The connecting piece is fixedly arranged in the assembly hole and is in sealed connection with the assembly hole;

[0030] The upper part of the connecting piece is in sealed connection with the burner, and the lower part of the connecting piece is in sealed connection with the main heat exchange flue.

[0031] In a feasible implementation, the bottom end of the second communication flue cavity is provided with a condensate water collection groove;

[0032] The condensate water in the main heat exchange flue and the secondary heat exchange flue flows into the third communication flue cavity under the action of gravity, and the condensate water penetrates through the heat preservation filter cover and flows into the condensate water collection groove;

[0033] The condensate water in the condensing cover flows into the condensate water collection groove under the action of gravity;

[0034] The inner end of the condensate exhaust pipe interface is connected with the condensate water collecting groove, and the outer end of the condensate exhaust pipe interface is connected with the outer flue and the condensate water discharge pipe.

[0035] In a feasible implementation, the heat-insulating filter cover comprises a cover body and a heat-insulating filter layer.

[0036] The cover body is provided with a plurality of filter holes, and the heat-insulating filter layer is arranged on the inner wall of the cover body.

[0037] In a feasible implementation, an inner container heat-insulating layer is arranged between the shell and the condensing cover, and the inner container heat-insulating layer completely wraps the outer wall of the condensing cover.

[0038] The high-efficiency condensing gas volumetric water heater provided by the embodiment of the present application comprises a shell, a condensing cover arranged in the shell, an inner container cylinder arranged in the inner cavity of the condensing cover, an upper cover head and a lower cover head fixedly arranged at two open ends of the inner container cylinder respectively, an annular flue formed between the outer side wall of the inner container cylinder and the inner side wall of the condensing cover, a first connecting flue formed between the outer wall of the upper cover head and the upper inner wall of the condensing cover, a second connecting flue formed between the outer wall of the lower cover head and the lower inner wall of the condensing cover, and high-temperature flue gas sequentially flows through the main heat exchange flue, the third connecting flue, the secondary heat exchange flue, the first connecting flue, the annular flue, the second connecting flue and the condensate exhaust pipe interface.

[0039] The bottom ends of the main heat exchange flue and the secondary heat exchange flue are fixedly connected with the lower cover head and connected with the third connecting flue, the condensate water in the main heat exchange flue and the secondary heat exchange flue flows into the third connecting flue, the condensate water in the third connecting flue penetrates the heat-insulating filter cover and flows into the second connecting flue, and then is discharged through the condensate exhaust pipe interface. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 is a front view of a conventional gas volumetric water heater;

[0041] Figure 2 is a structure schematic view of the high-efficiency condensing gas volumetric water heater provided by the present application;

[0042] Figure 3 is a top view of the water heater;

[0043] Figure 4 is a schematic diagram of a flue gas flow path.

[0044] Reference signs:

[0045] 10 - shell; 20 - combustion control system; 30 - liner assembly; 40 - water inlet and outlet assembly; 50 - condensing cover; 60 - liner insulation layer;

[0046] 21 - burner; 22 - control assembly; 23 - connecting piece; 31 - liner cylinder; 32 - upper cover head; 33 - lower cover head; 34 - insulation filter cover; 35 - main heat exchange flue; 36 - secondary heat exchange flue; 37 - condensing exhaust flue interface; 41 - water inlet pipe; 42 - water outlet pipe; 43 - blowdown pipe; 44 - pressure relief water pipe. DETAILED DESCRIPTION

[0047] In order for those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should fall within the scope of protection of the present application.

[0048] The existing slag has a relatively complex structure, and disassembly and maintenance is relatively cumbersome, resulting in inconvenient use. The high-efficiency condensing gas volumetric water heater provided in the embodiments of the present application can automatically feed the slag by setting a feeding rod in the connecting channel, the external slag can enter the transmission channel through the feeding opening and the feeding opening in sequence, the transmission swing rod is swung by driving the runner to rotate by the power mechanism, the transmission cross bar is reciprocatingly pushed and pulled, the piston rod is reciprocatingly moved along the transmission channel in the transverse direction, thereby pushing the slag, and automatic feeding is realized. The present application can automatically feed, is convenient to use, has a simple structure, is low in cost, and is beneficial to disassembly and maintenance.

[0049] The specific structure of the high-efficiency condensing gas volumetric water heater provided in the present application will be described in detail below in conjunction with the drawings.

[0050] Referring to Figures 2-4 As shown in the figure, the present application provides a high-efficiency condensing gas volumetric water heater, which comprises a shell 10, the shell 10 can be made of metal, can be cylindrical or cylindrical, the shell 10 is provided with a condensing cover 50 inside, the condensing cover 50 is provided with a liner assembly 30 inside, the liner assembly 30 is provided with a combustion control system 20 and a water inlet and outlet assembly 40;

[0051] The condensing cover 50 is a cylindrical structure, which can be made of metal and has good thermal conductivity. The condensing cover 50 is provided with an assembly hole at the top. The inner container assembly 30 includes an inner container cylinder 31, an upper cover head 32, a lower cover head 33, a heat preservation filter cover 34, a main heat exchange flue 35, a secondary heat exchange flue 36, and a condensing flue gas discharge pipe interface 37.

[0052] The inner container cylinder 31 is arranged in the inner cavity of the condensing cover 50. The inner container cylinder 31 is a vertically arranged tubular structure, and the upper and lower ends of the inner container cylinder 31 are both open ends. The upper cover head 32 and the lower cover head 33 are respectively fixedly arranged at the two open ends of the inner container cylinder 31. The upper cover head 32 and the lower cover head 33 can both be circular plates. The upper cover head 32, the inner container cylinder 31, and the lower cover head 33 jointly form a water storage cavity.

[0053] An annular flue gas passage is formed between the outer side wall of the inner container cylinder 31 and the inner side wall of the condensing cover 50. A first communication smoke cavity is formed between the outer wall of the upper cover head 32 and the upper inner wall of the condensing cover 50. A second communication smoke cavity is formed between the outer wall of the lower cover head 33 and the lower inner wall of the condensing cover 50. The first communication smoke cavity, the annular flue gas passage, and the second communication smoke cavity are sequentially connected.

[0054] The heat preservation filter cover 34 is fixedly arranged on the side of the lower cover head 33 which faces away from the upper cover head 32, i.e., on the lower surface of the lower cover head 33. The heat preservation filter cover 34 and the lower cover head 33 jointly form a third communication smoke cavity. The condensate water in the third communication smoke cavity penetrates the heat preservation filter cover 34 and enters the second communication smoke cavity.

[0055] The main heat exchange flue 35 and the secondary heat exchange flue 36 are both vertically arranged pipe bodies and have good thermal conductivity.

[0056] One end of the main heat exchange flue 35 is connected to the assembly hole of the condensing cover 50. The other end of the main heat exchange flue 35 sequentially penetrates the upper cover head 32, the water storage cavity, and the lower cover head 33, and is connected to the third communication smoke cavity.

[0057] One end of the secondary heat exchange flue 36 penetrates the lower cover head 33 and is connected to the third communication smoke cavity. The other end of the secondary heat exchange flue 36 penetrates the water storage cavity and the upper cover head 32 and is connected to the first communication smoke cavity.

[0058] The condensing flue gas discharge pipe interface 37 is fixedly arranged on the condensing cover 50. One end of the condensing flue gas discharge pipe interface 37 is connected to the second communication smoke cavity, and the other end penetrates the outer shell 10.

[0059] As Figure 4As shown, the combustion control system 20 is arranged in the main heat exchange flue 35, and the flue gas generated by combustion flows through the main heat exchange flue 35, the third connecting flue cavity, the secondary heat exchange flue 36, the first connecting flue cavity, the annular flue gas passage, the second connecting flue cavity and the condensing smoke exhaust pipe interface 37 in sequence.

[0060] The flue gas heated main heat exchange flue 35, lower cover head 33, secondary heat exchange flue 36, upper cover head 32 and condensing cover 50 are directly contacted with cold water to perform heat exchange.

[0061] The water heater provided by the application increases the heat exchange area with cold water, thereby improving the heat exchange efficiency and solving the problem of small heat exchange area and low heat exchange efficiency of the existing water heater.

[0062] Referring to Figure 3 As shown, in some embodiments, the condensing cover 50 and the inner container cylinder 31 are both cylindrical structures, and the condensing cover 50 and the inner container cylinder 31 are coaxially arranged, and the main heat exchange flue 35 is arranged at the middle part of the inner container cylinder 31.

[0063] The plurality of secondary heat exchange flues 36 are uniformly distributed around the main heat exchange flue 35 in a circular shape, and the distance between the secondary heat exchange flue 36 and the main heat exchange flue 35 and the number of the secondary heat exchange flue 36 can be designed according to the heat exchange requirement.

[0064] In some embodiments, when the high-temperature flue gas flows through the main heat exchange flue 35 and / or the secondary heat exchange flue 36, the high-temperature flue gas passes through the inner container assembly 30; when the high-temperature flue gas flows through the condensing cover 50, the high-temperature flue gas completely wraps the inner container assembly 30.

[0065] Referring to Figure 2 and Figure 4 As shown, in some embodiments, the water inlet and outlet assembly 40 includes a water inlet pipe 41 and a water outlet pipe 42.

[0066] The water inlet pipe 41 is fixedly connected with the inner container cylinder 31 and the condensing cover 50, one end of the water inlet pipe 41 is connected with the water storage cavity, and the other end penetrates through the shell 10 and is connected with an external pipeline.

[0067] The water outlet pipe 42 is fixedly connected with the inner container cylinder 31 and the condensing cover 50, one end of the water outlet pipe 42 is connected with the water storage cavity, and the other end penetrates through the shell 10 and is connected with an external pipeline.

[0068] The water inlet pipe 41 and the water outlet pipe 42 are located on the same side of the shell 10, as Figure 2 As shown, the water inlet pipe 41 and the water outlet pipe 42 are located on the left side of the shell 10, so that the water is conveniently fed from the lower part and the water is conveniently discharged from the upper part.

[0069] In some embodiments, the water inlet and outlet assembly 40 further comprises a drain pipe 43;

[0070] The drain pipe 43 is fixedly connected with the inner barrel 31 and the condensing cover 50, one end of the drain pipe 43 is in communication with the water storage cavity, and the other end penetrates through the shell 10 and is connected with an external pipeline;

[0071] In a natural state, the drain pipe 43 is in a closed state, when it is necessary to discharge the dirt in the shell, the valve on the drain pipe 43 can be opened to discharge the sediment.

[0072] In some embodiments, the water inlet and outlet assembly 40 further comprises a pressure relief water pipe 44;

[0073] The pressure relief water pipe 44 is fixedly connected with the inner barrel 31 and the condensing cover 50, one end of the pressure relief water pipe 44 is in communication with the water storage cavity, and the other end penetrates through the shell 10 and is connected with an external pipeline;

[0074] The drain pipe 43 and the pressure relief water pipe 44 are located on the same side of the shell 10, as shown in Figure 2 The drain pipe 43 and the pressure relief water pipe 44 are located on the right side of the shell 10, when the pressure exceeds a preset threshold, the pressure relief water pipe 44 opens to relieve pressure.

[0075] Referring to Figure 2 and Figure 4 In some embodiments, the combustion control system 20 comprises a burner 21 and a control assembly 22, the burner 21 is a conventional gas water heater burner, and the control assembly 22 is a full premix blower and gas proportional valve system control assembly, the control assembly 22 controls the operation of the water heater;

[0076] The control assembly 22 is arranged in the inner cavity of the shell 10;

[0077] The burner 21 is connected with the control assembly 22, and the burner 21 extends into the main heat exchange flue 35 through the assembly hole.

[0078] In some embodiments, the combustion control system 20 further comprises a connecting piece 23;

[0079] The connecting piece 23 is a circular ring structure, the lower part of the connecting piece 23 is provided with a first circular hole, and the upper part of the connecting piece 23 is provided with a second circular hole in communication with the first circular hole;

[0080] The inner wall of the second circular hole of the connecting piece 23 is sealingly connected with the outer wall of the burner 21, and the inner wall of the first circular hole of the connecting piece 23 is sealingly connected with the outer wall of the main heat exchange flue 35.

[0081] Referring to Figure 2As shown, in some embodiments, the bottom end of the second communicating flue cavity is formed with a condensed water collecting flue, and the condensed water in the main heat exchange flue pipe 35 and the secondary heat exchange flue pipe 36 flows into the third communicating flue cavity under the action of gravity, and the condensed water flows into the condensed water collecting flue through the heat preservation filter cover 34, and the condensed water in the condensed cover 50 flows into the condensed water collecting flue under the action of gravity.

[0082] The inner end of the condensed flue gas discharge pipe interface 37 is connected with the condensed water collecting flue, and the outer end of the condensed flue gas discharge pipe interface 37 is connected with the outer flue and the condensed water discharge pipe.

[0083] In some embodiments, the heat preservation filter cover 34 comprises a cover body and a heat preservation filter layer.

[0084] The cover body is a square cover body or a circular cover body, the bottom of the cover body is provided with a plurality of filter holes, the filter holes are round holes, the heat preservation filter layer is arranged on the inner wall of the cover body, the heat preservation filter layer can be heat preservation cotton, and the condensed water flows into the condensed water collecting flue through the heat preservation filter layer and the filter holes on the cover body.

[0085] In some embodiments, the inner shell heat preservation layer is arranged in the shell 10, and the inner shell heat preservation layer 60 completely wraps the outer wall of the condensed cover 50, so that the heat preservation effect is improved.

[0086] The high-efficiency condensing type gas volumetric water heater provided in the application is provided with a condensed cover 50 in the shell 10, an inner container cylinder 31 is arranged in the inner cavity of the condensed cover 50, an upper cover head 32 and a lower cover head 33 are respectively fixedly arranged at the two open ends of the inner container cylinder 31, an annular flue gas passage is formed between the outer side wall of the inner container cylinder 31 and the inner side wall of the condensed cover 50, a first communicating flue cavity is formed between the outer wall of the upper cover head 32 and the upper inner wall of the condensed cover 50, a second communicating flue cavity is formed between the outer wall of the lower cover head 33 and the lower inner wall of the condensed cover 50, flue gas sequentially flows through the main heat exchange flue pipe 35, the third communicating flue cavity, the secondary heat exchange flue pipe 36, the first communicating flue cavity, the annular flue gas passage, the second communicating flue cavity and the condensed flue gas discharge pipe interface 37, and high-temperature flue gas not only flows through the flue pipe inside the inner container, but also completely wraps the inner container outside, so that the heat exchange efficiency is improved.

[0087] It is easy to understand that, on the basis of the several embodiments provided in the application, a person skilled in the art can combine, split, recombine and the like to obtain other embodiments, and these embodiments do not exceed the protection scope of the application.

[0088] The above detailed description of the embodiments of the present application is merely intended to provide a further detailed description of the purpose, technical solutions and beneficial effects of the embodiments of the present application. It should be understood that the above is only a specific implementation of the embodiments of the present application, and is not used to limit the protection scope of the embodiments of the present application. Any modification, equivalent replacement, improvement, etc. made on the basis of the technical solutions of the embodiments of the present application shall be included in the protection scope of the embodiments of the present application.

Claims

1. A high efficiency condensing gas volumetric water heater characterised in that: The high-efficiency condensing gas volumetric water heater comprises a shell (10) provided with a condensing cover (50) and an inner container assembly (30) provided in the condensing cover (50), and the inner container assembly (30) is provided with a combustion control system (20) and a water inlet and outlet assembly (40); The condensing cover (50) is provided with an inner cavity, and the top of the condensing cover (50) is provided with an assembly hole; the inner container assembly (30) comprises an inner container cylinder (31), an upper cover head (32), a lower cover head (33), a heat preservation filter cover (34), a main heat exchange flue (35), a secondary heat exchange flue (36), and a condensing flue connection (37); The inner container cylinder (31) is arranged in the inner cavity of the condensing cover (50), the upper cover head (32) and the lower cover head (33) are respectively fixedly arranged at the two open ends of the inner container cylinder (31), and the upper cover head (32), the inner container cylinder (31) and the lower cover head (33) enclose a water storage cavity; An annular flue gas passage is formed between the outer side wall of the inner container cylinder (31) and the inner side wall of the condensing cover (50), a first communication smoke cavity is formed between the outer wall of the upper cover head (32) and the upper inner wall of the condensing cover (50), a second communication smoke cavity is formed between the outer wall of the lower cover head (33) and the lower inner wall of the condensing cover (50), and the first communication smoke cavity, the annular flue gas passage and the second communication smoke cavity are sequentially communicated; The heat preservation filter cover (34) is fixedly arranged on the side of the lower cover head (33) opposite to the upper cover head (32), the heat preservation filter cover (34) and the lower cover head (33) enclose a third communication smoke cavity, and the condensate water in the third communication smoke cavity penetrates through the heat preservation filter cover (34) and enters the second communication smoke cavity; One end of the main heat exchange flue (35) is communicated with the assembly hole of the condensing cover (50), and the other end of the main heat exchange flue (35) sequentially penetrates through the upper cover head (32), the water storage cavity and the lower cover head (33) and is communicated with the third communication smoke cavity; One end of the secondary heat exchange flue (36) penetrates through the lower cover head (33) and is communicated with the third communication smoke cavity, and the other end of the secondary heat exchange flue (36) penetrates through the water storage cavity and the upper cover head (32) and is communicated with the first communication smoke cavity; The condensing flue connection (37) is fixedly arranged on the condensing cover (50), one end of the condensing flue connection (37) is communicated with the second communication smoke cavity, and the other end of the condensing flue connection (37) penetrates through the shell (10); The combustion control system (20) is arranged in the main heat exchange flue (35), and the flue gas generated by combustion sequentially flows through the main heat exchange flue (35), the third communication smoke cavity, the secondary heat exchange flue (36), the first communication smoke cavity, the annular flue gas passage, the second communication smoke cavity and the condensing flue connection (37).

2. The high-efficiency condensing gas volumetric water heater according to claim 1, wherein The condensing cover (50) and the inner container cylinder (31) are both cylindrical structures, and the condensing cover (50) is coaxially arranged with the inner container cylinder (31); When the high-temperature flue gas flows through the main heat exchange flue (35) and / or the secondary heat exchange flue (36), the high-temperature flue gas passes through the inner container assembly (30); when the high-temperature flue gas flows through the condensing cover (50), the high-temperature flue gas completely wraps the inner container assembly (30).

3. The high-efficiency condensing gas volumetric water heater according to claim 1, characterized in that: The water inlet and outlet assembly (40) comprises a water inlet pipe (41) and a water outlet pipe (42); The water inlet pipe (41) is fixedly connected with the inner container cylinder (31) and the condensing cover (50), one end of the water inlet pipe (41) is in communication with the water storage cavity, and the other end penetrates through the shell (10) and is connected with an external pipeline; The water outlet pipe (42) is fixedly connected with the inner container cylinder (31) and the condensing cover (50), one end of the water outlet pipe (42) is in communication with the water storage cavity, and the other end penetrates through the shell (10) and is connected with an external pipeline; The water inlet pipe (41) and the water outlet pipe (42) are located on the same side of the shell (10).

4. The high-efficiency condensing gas volumetric water heater according to claim 3, characterized in that: The water inlet and outlet assembly (40) further comprises a blowdown pipe (43); The blowdown pipe (43) is fixedly connected with the inner container cylinder (31) and the condensing cover (50), one end of the blowdown pipe (43) is in communication with the water storage cavity, and the other end penetrates through the shell (10) and is connected with an external pipeline.

5. The high-efficiency condensing gas volumetric water heater according to claim 4, characterized in that: The water inlet and outlet assembly (40) further comprises a pressure relief water pipe (44); The pressure relief water pipe (44) is fixedly connected with the inner container cylinder (31) and the condensing cover (50), one end of the pressure relief water pipe (44) is in communication with the water storage cavity, and the other end penetrates through the shell (10) and is connected with an external pipeline; The blowdown pipe (43) and the pressure relief water pipe (44) are located on the same side of the shell (10).

6. The high-efficiency condensing gas volumetric water heater according to claim 1, characterized in that: The combustion control system (20) comprises a burner (21) and a control assembly (22); The control assembly (22) is arranged in the inner cavity of the shell (10); The burner (21) is connected with the control assembly (22), and the burner (21) extends into the main heat exchange flue (35) through the assembly hole.

7. The high-efficiency condensing gas volumetric water heater according to claim 6, characterized in that: The combustion control system (20) further comprises a connecting piece (23); The connecting piece (23) is fixedly arranged in the assembly hole and is in sealed connection with the assembly hole; The upper part of the connecting piece (23) is in sealed connection with the burner (21), and the lower part of the connecting piece (23) is in sealed connection with the main heat exchange flue (35).

8. The high-efficiency condensing gas volumetric water heater according to claim 1, characterized in that: the bottom end of the second connecting flue is provided with a condensate water collecting groove; the condensate water in the main heat exchange flue (35) and the secondary heat exchange flue (36) flows into the third connecting flue under the action of gravity, and the condensate water penetrates the heat preservation filter cover (34) and flows into the condensate water collecting groove; the condensate water in the condensing cover (50) flows into the condensate water collecting groove under the action of gravity; the inner end of the condensing flue outlet (37) is connected with the condensate water collecting groove, and the outer end of the condensing flue outlet (37) is connected with the outer flue and the condensate water discharge pipe.

9. The high-efficiency condensing gas volumetric water heater according to claim 8, characterized in that: the heat preservation filter cover (34) comprises a cover body and a heat preservation filter layer; the cover body is provided with a plurality of filter holes, and the heat preservation filter layer is arranged on the inner wall of the cover body, and the condensate water flows into the condensate water collecting groove through the heat preservation filter layer and the filter holes on the cover body.

10. The high-efficiency condensing gas volumetric water heater according to claim 9, characterized in that: an inner container heat preservation layer (60) is arranged between the shell (10) and the condensing cover (50), and the inner container heat preservation layer (60) completely wraps the outer wall of the condensing cover (50).

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