Condensation type gas volumetric water heater

Abstract

The utility model provides a condensation type gas positive displacement water heater, and relates to the technical field of water heaters, the condensation type gas positive displacement water heater comprises a shell, an inner container assembly is arranged in an inner cavity of the shell, a combustion control system and a water inlet and outlet assembly are arranged on the inner container assembly, and the bottom ends of a main heat exchange smoke pipe and a secondary heat exchange smoke pipe are fixedly connected with a lower cover sealing head and communicate with a third communicating smoke cavity; smoke flows through the main heat exchange smoke pipe, the third communication smoke cavity and the secondary heat exchange smoke pipe in sequence, condensate water in the main heat exchange smoke pipe and the secondary heat exchange smoke pipe flows into the third communication smoke cavity, condensate water in the third communication smoke cavity permeates the heat preservation filter cover to flow into the second communication smoke cavity, and then the condensate water is exhausted through the condensation smoke exhaust pipe connector. According to the water heater, the machining difficulty and the manufacturing cost are reduced, meanwhile, the stroke of the main heat exchange smoke pipe and the stroke of the secondary heat exchange smoke pipe are increased to a certain extent, the exchange area is increased on year-on-year basis, the exchange efficiency is improved, condensate water is conveniently discharged, pipeline corrosion is avoided, and the fault rate of the water heater is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water heaters, in particular to a 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, the water vapor in high-temperature flue gas is condensed into water, and the latent heat of vaporization is released, thereby improving thermal efficiency and reducing energy consumption. At the same time, it is equipped with a high-precision temperature control system, 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, overheat protection, and leakage protection, to ensure safe and reliable use.

[0003] The existing condensing gas volumetric water heater has the following problems:

[0004] 1. The bottom end of the main heat exchange flue pipe is sealed, and the condensed water cannot be discharged. After a certain accumulation, it may cause corrosion of the lower end of the main heat exchange flue pipe and leakage, ultimately leading to the failure of the inner tank.

[0005] 2. The secondary heat exchange flue pipe is connected to the main heat exchange flue pipe through an elbow joint, which is difficult to process and has high manufacturing cost.

[0006] In order to solve the above problems, the present application provides a condensing gas volumetric water heater. CONTENT OF THE INVENTION

[0007] The present application provides a condensing gas volumetric water heater, the bottom end of the main heat exchange flue pipe and the secondary heat exchange flue pipe are fixedly connected with the lower cover head, and are connected with the third communication smoke chamber, the flue gas flows through the main heat exchange flue pipe, the third communication smoke chamber and the secondary heat exchange flue pipe in turn, and the condensed water in the main heat exchange flue pipe and the secondary heat exchange flue pipe flows into the third communication smoke chamber, the condensed water in the third communication smoke chamber penetrates the heat preservation filter cover and flows into the second communication smoke chamber, and then is discharged through the condensing exhaust pipe interface. The water heater provided by the present application reduces the processing difficulty and manufacturing cost, at the same time, increases the stroke of the main heat exchange flue pipe and the secondary heat exchange flue pipe to some extent, increases the exchange area and improves the exchange efficiency, and facilitates the discharge of condensed water, avoids pipeline corrosion, and reduces the failure rate of the water heater. The present application solves the problems of the existing water heater, such as high processing difficulty, high manufacturing cost, and inability to discharge condensed water, which easily corrodes the pipeline and leads to high failure rate of the water heater.

[0008] The embodiment of the present application provides a condensing type gas volumetric water heater, which comprises a shell, an inner container assembly is arranged in the inner cavity of the shell, a combustion control system and a water inlet and outlet assembly are arranged on the inner container assembly;

[0009] 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, a secondary heat exchange flue, a final heat exchange flue and a condensation flue connector;

[0010] The inner container cylinder is arranged in the inner cavity of the shell, the upper cover head and the lower cover head are arranged at two open ends of the inner container cylinder respectively, and the upper cover head, the inner container cylinder and the lower cover head enclose a water storage cavity;

[0011] A first communication flue cavity is arranged on the upper part of the upper cover head, a second communication flue cavity is arranged on the lower part of the lower cover head, the heat preservation filter cover is arranged on the side of the lower cover head which is opposite to the upper cover head, the heat preservation filter cover and the lower cover head enclose a third communication flue cavity, and the condensate water in the third communication flue cavity penetrates the heat preservation filter cover and flows into the second communication flue cavity;

[0012] One end of the main heat exchange flue is connected with the upper cover head, and the other end penetrates through the water storage cavity and the lower cover head and is connected with the third communication flue cavity;

[0013] One end of the secondary heat exchange flue is connected with the lower cover head and connected with the third communication flue cavity, and the other end penetrates through the water storage cavity and the upper cover head and is connected with the first communication flue cavity;

[0014] One end of the final heat exchange flue is connected with the upper cover head and connected with the first communication flue cavity, and the other end penetrates through the water storage cavity and the lower cover head and is connected with the second communication flue cavity;

[0015] The condensation flue connector is fixedly arranged on the inner container cylinder, one end of the condensation flue connector is connected with the second communication flue cavity, and the other end penetrates through the shell;

[0016] The combustion control system is arranged in the main heat exchange flue, and the flue gas generated by combustion flows through the main heat exchange flue, the third communication flue cavity, the secondary heat exchange flue, the first communication flue cavity, the final heat exchange flue, the second communication flue cavity and the condensation flue connector in sequence.

[0017] In a feasible implementation manner, the inner container cylinder is a cylindrical structure, and the main heat exchange flue is arranged in the middle part of the inner container cylinder;

[0018] The plurality of secondary heat exchange flues are evenly distributed around the primary heat exchange flue in a circular manner, and the plurality of final heat exchange flues are evenly distributed around the primary heat exchange flue and the secondary heat exchange flues in a circular manner.

[0019] In an implementation, the water inlet and outlet assembly comprises a water inlet pipe and a water outlet pipe;

[0020] The water inlet pipe is fixed to the bottom of the side wall of the inner container cylinder, one end of the water inlet pipe is in communication with the water storage cavity, and the other end penetrates through the shell;

[0021] The water outlet pipe is fixed to the top of the side wall of the inner container cylinder, one end of the water outlet pipe is in communication with the water storage cavity, and the other end penetrates through the shell;

[0022] The water inlet pipe and the water outlet pipe are located on the same side of the shell.

[0023] In an implementation, the water inlet and outlet assembly further comprises a blowdown pipe;

[0024] The blowdown pipe is fixed to the bottom of the side wall of the inner container cylinder, one end of the blowdown pipe is in communication with the water storage cavity, and the other end penetrates through the shell.

[0025] In an implementation, the water inlet and outlet assembly further comprises a pressure relief water pipe;

[0026] The pressure relief water pipe is fixed to the top of the side wall of the inner container cylinder, one end of the pressure relief water pipe is in communication with the water storage cavity, and the other end penetrates through the shell;

[0027] The blowdown pipe and the pressure relief water pipe are located on the same side of the shell.

[0028] In an implementation, the combustion control system comprises a burner and a control assembly;

[0029] The control assembly is arranged in the inner cavity of the shell;

[0030] The burner is connected with the control assembly, and the burner extends into the primary heat exchange flue.

[0031] In an implementation, the combustion control system further comprises a connecting piece;

[0032] The connecting piece is fixed in the assembly hole and is in sealed connection with the assembly hole;

[0033] 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 primary heat exchange flue.

[0034] In an implementable manner, the inner wall of the shell is provided with an inner container heat preservation layer, which wraps the outer side wall of the inner container cylinder;

[0035] The upper inner wall of the inner container heat preservation layer and the outer wall of the upper cover head enclose the first communicating smoke cavity;

[0036] The lower inner wall of the inner container heat preservation layer and the outer wall of the lower cover head enclose the second communicating smoke cavity.

[0037] In an implementable manner, the bottom end inner wall of the inner container heat preservation layer is provided with a condensed water collection groove;

[0038] The condensed water in the main heat exchange smoke pipe and the secondary heat exchange smoke pipe flows into the heat preservation filter cover under the action of gravity, the condensed water flows into the condensed water collection groove through the heat preservation filter cover, and the condensed water in the final heat exchange smoke pipe flows into the condensed water collection groove under the action of gravity;

[0039] The inner end of the condensed smoke exhaust pipe interface is in communication with the condensed water collection groove, and the outer end of the condensed smoke exhaust pipe interface is in communication with the external flue and the condensed water discharge pipe.

[0040] In an implementable manner, the heat preservation filter cover comprises a cover body and a heat preservation filter layer;

[0041] The cover body is provided with a plurality of filter holes, the heat preservation filter layer is arranged on the inner wall of the cover body, and the condensed water flows into the condensed water collection groove through the heat preservation filter layer and the filter holes on the cover body.

[0042] The condensed smoke exhaust pipe interface is in communication with the condensed water collection groove, and the outer end of the condensed smoke exhaust pipe interface is in communication with the external flue and the condensed water discharge pipe. BRIEF DESCRIPTION OF DRAWINGS

[0043] Figure 1 is a front view of a conventional gas volumetric water heater;

[0044] Figure 2 is a structure schematic view of the condensing gas volumetric water heater provided by the application.

[0045] Figure 3 is a top view of the water heater;

[0046] Figure 4 is a schematic diagram of the flue gas flow path.

[0047] BRIEF DESCRIPTION OF DRAWINGS

[0048] 10 - outer shell; 20 - combustion control system; 30 - inner tank assembly; 40 - water inlet and outlet assembly; 50 - inner tank insulation layer; 60 - condensate water collection groove;

[0049] 21 - burner; 22 - control assembly; 23 - connecting piece; 31 - upper cover head; 32 - lower cover head; 33 - insulation filter cover; 34 - main heat exchange flue pipe; 35 - secondary heat exchange flue pipe; 36 - final heat exchange flue pipe; 37 - condensate exhaust pipe interface; 38 - inner tank cylinder; 41 - water inlet pipe; 42 - water outlet pipe; 43 - blowdown pipe; 44 - pressure relief water pipe. DETAILED DESCRIPTION

[0050] 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 clearly and completely described 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 the embodiments. 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.

[0051] The condensing gas volumetric water heater is a high-efficiency energy-saving water supply device, as shown in Figure 1 is a sectional view of a conventional gas volumetric water heater, where A is a main heat exchange flue pipe, B is a secondary heat exchange flue pipe, and C is an elbow joint. It can be seen that the bottom end of the main heat exchange flue pipe A is directly sealed, and the bottom end of the secondary heat exchange flue pipe B is connected to the main heat exchange flue pipe A through the elbow joint C. Such a structure has a large processing difficulty and a high manufacturing cost, and the condensate water in the main heat exchange flue pipe A cannot be drained away and accumulates at the bottom, which may cause corrosion of the lower end head of the main heat exchange flue pipe A, resulting in water leakage and ultimately leading to failure of the inner tank.

[0052] The condensing gas-fired storage water heater provided in this application has its bottom ends of the main heat exchange flue 34 and the secondary heat exchange flue 35 fixedly connected to the lower cover end cap 32 and connected to the second connecting flue chamber. The flue gas flows sequentially through the main heat exchange flue 34, the second connecting flue chamber, and the secondary heat exchange flue 35. The condensate in the main heat exchange flue 34 and the secondary heat exchange flue 35 flows into the second connecting flue chamber. The condensate in the second connecting flue chamber permeates the heat insulation filter cover 33 and flows into the third connecting flue chamber, and is then discharged through the condensate exhaust pipe interface 37. The water heater provided in this application reduces the processing difficulty and manufacturing cost. At the same time, it increases the stroke of the main heat exchange flue and the secondary heat exchange flue to a certain extent, increases the exchange area, improves the exchange efficiency, and facilitates the discharge of condensate, avoids pipe corrosion, and reduces the failure rate of the water heater.

[0053] The following detailed description of the specific structure of the condensing gas-fired storage water heater provided in this application is provided in conjunction with the accompanying drawings.

[0054] Reference Figures 2-4 As shown, this application provides a condensing gas-fired storage water heater, including a housing 10;

[0055] The outer shell 10 may be made of metal and may be cylindrical or tubular. The outer shell 10 has an inner cavity, which may be rectangular or cylindrical. The inner cavity of the outer shell 10 has an inner liner assembly 30, and the inner liner assembly 30 has a combustion control system 20 and a water inlet / outlet assembly 40.

[0056] The inner liner assembly 30 includes an inner liner cylinder 38, an upper cover end cap 31, a lower cover end cap 32, a heat insulation filter cover 33, a main heat exchange flue pipe 34, a secondary heat exchange flue pipe 35, a final heat exchange flue pipe 36, and a condenser exhaust pipe interface 37.

[0057] The inner liner 38 is disposed in the inner cavity of the outer shell 10. The inner liner 38 can be a vertically arranged tube with open ends at both the top and bottom. The upper cover 31 and the lower cover 32 are respectively disposed at the two open ends of the inner liner 38. Both the upper cover 31 and the lower cover 32 can be circular or square plates. The upper cover 31, the inner liner 38 and the lower cover 32 together form a water storage cavity.

[0058] The upper part of the upper cover 31 is provided with a first connecting smoke chamber, and the lower part of the lower cover 32 is provided with a second connecting smoke chamber. The heat-insulating filter cover 33 is disposed on the side of the lower cover 32 opposite to the upper cover 31, that is, on the lower surface of the lower cover 32. The heat-insulating filter cover 33 can be a square cover or a semi-circular cover. The heat-insulating filter cover 33 and the lower cover 32 together form a third connecting smoke chamber. The condensate in the third connecting smoke chamber permeates the heat-insulating filter cover 33 and flows into the second connecting smoke chamber.

[0059] The condensed water in the third communicating smoke cavity penetrates the heat preservation cover 33 and flows into the second communicating smoke cavity;

[0060] The main heat exchange smoke pipe 34, the secondary heat exchange smoke pipe 35 and the last heat exchange smoke pipe 36 are all vertical straight pipe bodies, the inner diameter of the main heat exchange smoke pipe 34 is larger than the inner diameters of the secondary heat exchange smoke pipe 35 and the last heat exchange smoke pipe 36, and the inner diameters of the secondary heat exchange smoke pipe 35 and the last heat exchange smoke pipe 36 are equal;

[0061] The top end of the main heat exchange smoke pipe 34 is connected with the upper cover head 31, the bottom end of the main heat exchange smoke pipe 34 is sealingly connected with the lower cover head 32, and is connected with the third communicating smoke cavity;

[0062] The bottom end of the secondary heat exchange smoke pipe 35 is sealingly connected with the lower cover head 32, and is connected with the third communicating smoke cavity, the top end of the secondary heat exchange smoke pipe 35 is sealingly connected with the upper cover head 31, and is connected with the first communicating smoke cavity;

[0063] The top end of the last heat exchange smoke pipe 36 is sealingly connected with the upper cover head 31, and is connected with the first communicating smoke cavity, the bottom end of the last heat exchange smoke pipe 36 is connected with the lower cover head 32, and is connected with the second communicating smoke cavity;

[0064] The condensed smoke exhaust pipe interface 37 is fixedly arranged on the inner container cylinder 38, one end of the condensed smoke exhaust pipe interface 37 is connected with the second communicating smoke cavity, and the other end penetrates through the shell 10;

[0065] As shown in Figure 4 The combustion control system 20 is arranged in the main heat exchange smoke pipe 34, the smoke generated by combustion flows through the main heat exchange smoke pipe 34, the third communicating smoke cavity, the secondary heat exchange smoke pipe 35, the first communicating smoke cavity, the last heat exchange smoke pipe 36, the second communicating smoke cavity and the condensed smoke exhaust pipe interface 37 in sequence;

[0066] The smoke is heated by the upper cover head 31, the lower cover head 32, the main heat exchange smoke pipe 34, the secondary heat exchange smoke pipe 35 and the last heat exchange smoke pipe 36, and the heat exchange is directly performed between the cover head and the smoke pipe and cold water.

[0067] The water heater provided by the application reduces the processing difficulty and manufacturing cost, at the same time, the stroke of the main heat exchange smoke pipe and the secondary heat exchange smoke pipe is increased to a certain extent, the exchange area is increased, the exchange efficiency is improved, the condensed water is easily discharged, the pipeline corrosion is avoided, and the failure rate of the water heater is reduced.

[0068] Referring to Figure 3 As shown in some embodiments, the shell 10 and the inner container cylinder 38 are both cylindrical structures, and the main heat exchange smoke pipe 34 is arranged in the middle part of the inner container cylinder 38;

[0069] A plurality of said secondary heat exchange flues 35 are evenly distributed around said primary heat exchange flue 34 in a circular manner. The distance between the secondary heat exchange flue 35 and the primary heat exchange flue 34 and the number of the secondary heat exchange flues 35 can be designed according to the heat exchange requirement.

[0070] A plurality of said final heat exchange flues 36 are evenly distributed around said primary heat exchange flue 34 and said secondary heat exchange flue 35 in a circular manner. The distance between the final heat exchange flue 36 and the secondary heat exchange flue 35 and the number of the final heat exchange flues 36 can be designed according to the heat exchange requirement.

[0071] Referring to Figure 2 and Figure 4 In some embodiments, the water inlet and outlet assembly 40 comprises a water inlet pipe 41 and a water outlet pipe 42.

[0072] The water inlet pipe 41 is fixedly arranged at the bottom of the side wall of the inner cylinder 38. 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.

[0073] The water outlet pipe 42 is fixedly arranged at the top of the side wall of the inner cylinder 38. 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.

[0074] The water inlet pipe 41 and the water outlet pipe 42 are located on the same side of the shell 10, as shown in Figure 2 The water inlet pipe 41 and the water outlet pipe 42 are located on the left side of the inner cylinder 38, so as to facilitate water inlet at the lower part and water outlet at the upper part.

[0075] In some embodiments, the water inlet and outlet assembly 40 further comprises a blowdown pipe 43.

[0076] The blowdown pipe 43 is fixedly arranged at the bottom of the side wall of the inner cylinder 38. One end of the blowdown pipe 43 is in communication with the water storage cavity, and the other end penetrates through the shell 10.

[0077] In a natural state, the blowdown pipe 43 is in a closed state. When it is necessary to discharge the pollutants in the shell, the valve on the blowdown pipe 43 can be opened to discharge the sediments.

[0078] In some embodiments, the water inlet and outlet assembly 40 further comprises a pressure relief water pipe 44.

[0079] The pressure relief water pipe 44 is fixedly arranged at the top of the side wall of the inner cylinder 38. 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.

[0080] The blowdown pipe 43 and the pressure relief water pipe 44 are located on the same side of the inner cylinder 38, as shown in Figure 2As shown, the drain pipe 43 and the pressure relief water pipe 44 are located on the right side of the inner liner cylinder 38. When the pressure exceeds the preset threshold, the pressure relief water pipe 44 opens the pressure relief.

[0081] Referring to Figure 2 and Figure 4 As shown, 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.

[0082] The control assembly 22 is arranged in the inner cavity of the outer shell 10.

[0083] The burner 21 is connected to the control assembly 22, and the burner 21 extends into the main heat exchange flue 34.

[0084] In some embodiments, the combustion control system 20 further comprises a connecting piece 23.

[0085] 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.

[0086] The inner wall of the second circular hole of the connecting piece 23 is sealingly connected to the outer wall of the burner 21, and the inner wall of the first circular hole of the connecting piece 23 is sealingly connected to the outer wall of the main heat exchange flue 34.

[0087] Referring to Figure 2 As shown, in some embodiments, the inner wall of the outer shell 10 is provided with an inner liner insulation layer 50. The material of the inner liner insulation layer 50 is not limited. The inner liner insulation layer 50 wraps the outer side wall of the inner liner cylinder 38, thereby improving the insulation effect.

[0088] The upper inner wall of the inner liner insulation layer 50 and the outer wall of the upper cover head 31 form the first communication flue chamber. In order to facilitate the assembly of the burner 21, the top end of the inner liner insulation layer 50 is provided with an assembly hole. The burner 21 is inserted and assembled in the assembly hole. The lower edge of the assembly hole is fixedly connected to the upper cover head 31. The first communication flue chamber is an annular cavity.

[0089] The lower inner wall of the inner liner insulation layer 50 and the outer wall of the lower cover head 32 form the second communication flue chamber. The second communication flue chamber is a circular cavity.

[0090] In some embodiments, the bottom inner wall of the inner liner insulation layer 50 is provided with a condensate water smoke collecting groove 60, i.e., the bottom end of the third communication flue chamber is formed with the condensate water smoke collecting groove 60. The condensate water smoke collecting groove 60 can be made of stainless steel and can be a circular disc structure.

[0091] The condensed water in the main heat exchange flue 34 and the secondary heat exchange flue 35 flows into the heat preservation filter cover 33 under the action of gravity, and the condensed water flows into the condensed water collecting groove 60 through the heat preservation filter cover 33, and the condensed water in the final heat exchange flue 36 flows into the condensed water collecting groove 60 under the action of gravity.

[0092] The inner end of the condensed flue gas outlet 37 is connected with the condensed water collecting groove 60, and the outer end of the condensed flue gas outlet 37 is connected with the outer flue and the condensed water discharge pipe.

[0093] In some embodiments, the heat preservation filter cover 33 comprises a cover body and a heat preservation filter layer.

[0094] 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 groove through the heat preservation filter layer and the filter holes on the cover body.

[0095] The condensed flue gas outlet 37 is connected with the condensed water collecting groove 60, and the outer end of the condensed flue gas outlet 37 is connected with the outer flue and the condensed water discharge pipe.

[0096] It is easy to understand that, on the basis of the several embodiments provided by the present application, the 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 present application.

[0097] The above specific embodiments, purposes, technical solutions and beneficial effects of the embodiments of the present application are further described in detail, and it should be understood that the above is only a specific embodiment of the present application, and is not used to limit the protection scope of the present application, and any modification, equivalent replacement, improvement and the like made on the basis of the technical solutions of the embodiments of the present application should be included in the protection scope of the embodiments of the present application.

Claims

1. A condensing gas volumetric water heater characterised in that: The condensing type gas volumetric water heater comprises an outer shell (10), an inner container assembly (30) arranged in the inner cavity of the outer shell (10), a combustion control system (20) and an inlet and outlet water assembly (40) arranged on the inner container assembly (30). The inner container assembly (30) comprises an inner container cylinder (38), an upper cover head (31), a lower cover head (32), a heat preservation filter cover (33), a main heat exchange flue (34), a secondary heat exchange flue (35), a final heat exchange flue (36) and a condensation and smoke exhaust pipe interface (37). The inner container cylinder (38) is arranged in the inner cavity of the outer shell (10), the upper cover head (31) and the lower cover head (32) are arranged at two open ends of the inner container cylinder (38) respectively, and the upper cover head (31), the inner container cylinder (38) and the lower cover head (32) enclose a water storage cavity. A first connecting smoke cavity is arranged on the upper part of the upper cover head (31), a second connecting smoke cavity is arranged on the lower part of the lower cover head (32), the heat preservation filter cover (33) is arranged on the side of the lower cover head (32) which is opposite to the upper cover head (31), the heat preservation filter cover (33) and the lower cover head (32) enclose a third connecting smoke cavity, and the condensate water in the third connecting smoke cavity penetrates the heat preservation filter cover (33) and flows into the second connecting smoke cavity. One end of the main heat exchange flue (34) is connected with the upper cover head (31), the other end penetrates the water storage cavity and the lower cover head (32) and is connected with the third connecting smoke cavity. One end of the secondary heat exchange flue (35) is connected with the lower cover head (32) and is connected with the third connecting smoke cavity, the other end penetrates the water storage cavity and the upper cover head (31) and is connected with the first connecting smoke cavity. One end of the final heat exchange flue (36) is connected with the upper cover head (31) and is connected with the first connecting smoke cavity, the other end penetrates the water storage cavity and the lower cover head (32) and is connected with the second connecting smoke cavity. The condensation and smoke exhaust pipe interface (37) is fixedly arranged on the inner container cylinder (38), one end of the condensation and smoke exhaust pipe interface (37) is connected with the second connecting smoke cavity, and the other end penetrates the outer shell (10). The combustion control system (20) is arranged in the main heat exchange flue (34), and the smoke generated by combustion flows through the main heat exchange flue (34), the third connecting smoke cavity, the secondary heat exchange flue (35), the first connecting smoke cavity, the final heat exchange flue (36), the second connecting smoke cavity and the condensation and smoke exhaust pipe interface (37) in sequence.

2. The condensing type gas volumetric water heater according to claim 1, wherein: The inner container cylinder (38) is in a cylindrical structure, and the main heat exchange flue (34) is arranged in the middle part of the inner container cylinder (38); A plurality of the secondary heat exchange flues (35) are evenly distributed around the main heat exchange flue (34) in a circular shape, and a plurality of the final heat exchange flues (36) are evenly distributed around the main heat exchange flue (34) and the secondary heat exchange flues (35) in a circular shape.

3. The 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 fixed to the bottom of the side wall of the inner cylinder (38), one end of the water inlet pipe (41) is connected with the water storage cavity, and the other end penetrates through the shell (10); the water outlet pipe (42) is fixed to the top of the side wall of the inner cylinder (38), one end of the water outlet pipe (42) is connected with the water storage cavity, and the other end penetrates through the shell (10); the water inlet pipe (41) and the water outlet pipe (42) are located on the same side of the shell (10).

4. The 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 fixed to the bottom of the side wall of the inner cylinder (38), one end of the blowdown pipe (43) is connected with the water storage cavity, and the other end penetrates through the shell (10).

5. The 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 fixed to the top of the side wall of the inner cylinder (38), one end of the pressure relief water pipe (44) is connected with the water storage cavity, and the other end penetrates through the shell (10); the blowdown pipe (43) and the pressure relief water pipe (44) are located on the same side of the shell (10).

6. The 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 (34).

7. The 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 fixed 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 (34).

8. The condensing gas volumetric water heater according to claim 1, characterized in that: the inner wall of the shell (10) is provided with an inner cylinder insulation layer (50), and the inner cylinder insulation layer (50) wraps the outer side wall of the inner cylinder (38); the upper inner wall of the inner cylinder insulation layer (50) and the outer wall of the upper cover head (31) jointly form the first communication flue chamber; the lower inner wall of the inner cylinder insulation layer (50) and the outer wall of the lower cover head (32) jointly form the second communication flue chamber.

9. The condensing gas volumetric water heater according to claim 8, characterized in that: the bottom end inner wall of the inner cylinder insulation layer (50) is provided with a condensate water collecting groove (60). The condensed water in the main heat exchange flue (34) and the secondary heat exchange flue (35) flows into the heat preservation filter cover (33) under the action of gravity, and the condensed water flows into the condensed water collecting groove through the heat preservation filter cover (33), and the condensed water in the final heat exchange flue (36) flows into the condensed water collecting groove under the action of gravity; The inner end of the condensed exhaust flue interface (37) is connected with the condensed water collecting groove, and the outer end of the condensed exhaust flue interface (37) is connected with the outer flue and the condensed water discharge pipe.

10. The condensing gas volumetric water heater according to claim 9, characterized in that: The heat preservation filter cover (33) comprises a cover body and a heat preservation filter layer; A plurality of filter holes are arranged on the cover body, and the heat preservation filter layer is arranged on the inner wall of the cover body, and the condensed water flows into the condensed water collecting groove through the heat preservation filter layer and the filter holes on the cover body.

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