Gas water heater with double fans

Abstract

The utility model discloses a double-fan gas water heater which comprises a combustion shell, and a combustion cavity is formed in the combustion shell. The combustor assembly is arranged in the combustion cavity; the heat exchange assembly comprises a heat exchange pipe, and the heat exchange pipe is used for conducting heat exchange with combustion heat in the combustion cavity; one end of the heat exchange pipe is communicated with the water inlet pipe, and the other end of the heat exchange pipe is communicated with the water outlet pipe; the exhaust fan is installed at the top end of the combustion shell, and an air inlet of the exhaust fan communicates with the top end of the combustion cavity; the air blower is installed at the bottom end of the combustion shell, and an air outlet of the air blower communicates with the bottom end of the combustion cavity. The exhaust fan is arranged at the top end of the combustor, exhaust is performed above the combustor to exhaust waste gas, meanwhile, the air blower is arranged at the bottom end of the combustor in a matched mode, air blowing is performed below the combustor, upward air blowing is assisted, stronger airflow power can be formed, air pressure can be multiplied through series connection of the exhaust fan and the air blower, and smooth smoke exhaust is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to water heater technical field especially relates to a gas water heater of double fan. BACKGROUND

[0002] The existing gas water heater is with gas leading into the burner of water heater, produces heat through combustion to exchange heat with the water in the heat exchange pipe, thereby providing hot water.

[0003] And in the use process of gas water heater, heat is produced by gas combustion, so exhaust gas is produced in the use process, so it is necessary to set up exhaust fan to exhaust exhaust gas.

[0004] The conventional gas water heater has two ways when discharging exhaust gas:

[0005] The first way is to set up exhaust fan directly above the burner to exhaust combustion exhaust gas through the top, which has the following defects:

[0006] The exhaust fan set in the upper part mainly functions to exhaust the combustion exhaust gas, and the ability to actively supply air into the combustion chamber is relatively weak.

[0007] The working mode of the exhaust fan set in the upper part makes the air pressure in the combustion chamber relatively low, and when encountering strong external wind, the external air is easy to flow back into the combustion chamber through the exhaust pipe, affecting normal combustion, and even possibly causing ignition difficulty or combustion failure.

[0008] The second way is to set up air blower directly below the burner to blow air upward at the bottom end of the burner, and the combustion exhaust gas is discharged upward, which has the following defects:

[0009] The air blower below is mainly responsible for blowing air into the combustion chamber to provide oxygen, and only relies on passive methods such as natural upward airflow and chimney effect to discharge exhaust gas, which has low exhaust gas discharge efficiency. In addition, if the air blower fails, the water heater with only the air blower will not be able to discharge exhaust gas normally.

[0010] In order to overcome at least one of the above-mentioned defects of the prior art, the utility model discloses a gas water heater of double fan, which is characterized in that: an air extractor is arranged at the top end of the burner to exhaust waste gas above the burner, and an air blower is arranged at the bottom end of the burner to blow air below the burner, which can form stronger air flow power, and the wind pressure can be doubled by the series connection of the air extractor and the air blower, thereby ensuring smooth smoke exhaust.

[0011] The utility model discloses a gas water heater of double fan, which is characterized in that:

[0012] A gas water heater of double fan, comprising,

[0013] A combustion shell is provided with a combustion cavity inside;

[0014] A burner assembly is arranged in the combustion cavity and used for guiding in gas and burning;

[0015] A heat exchange assembly comprises heat exchange pipes used for heat exchange with combustion heat in the combustion cavity; one end of the heat exchange pipes is communicated with a water inlet pipe, and the other end of the heat exchange pipes is communicated with a water outlet pipe;

[0016] An air extractor is installed at the top end of the combustion shell, and the air inlet of the air extractor is communicated with the top end of the combustion cavity;

[0017] An air blower is installed at the bottom end of the combustion shell, and the air outlet of the air blower is communicated with the bottom end of the combustion cavity.

[0018] Further, the heat exchange assembly comprises a heat exchange shell installed at the top end of the combustion shell; the heat exchange shell is provided with a heat exchange cavity inside, and the heat exchange cavity is communicated with the combustion cavity; the air extractor is installed at the top end of the heat exchange shell, and the air inlet of the air extractor is communicated with the top end of the heat exchange cavity.

[0019] Further, the heat exchange pipes comprise at least two first heat exchange pipe segments penetrating into the heat exchange cavity, and adjacent two first heat exchange pipe segments are communicated with each other; the water inlet pipe is communicated with one of the first heat exchange pipe segments, and the water outlet pipe is communicated with another first heat exchange pipe segment.

[0020] Further, the heat exchange pipes further comprise a second heat exchange pipe segment, the second heat exchange pipe segment is arranged outside the heat exchange shell and communicated with one of the first heat exchange pipe segments, and the water inlet pipe is communicated with the second heat exchange pipe segment.

[0021] Further, adjacent two first heat exchange pipe segments are communicated by a curved pipe segment, and the curved pipe segment extends out of the heat exchange shell.

[0022] Further, the top end of the combustion shell is provided with a first connecting edge, and the bottom end of the heat exchange shell is provided with a second connecting edge, the first connecting edge abuts against and connects with the second connecting edge.

[0023] Further, the exhaust inlet of the exhaust fan is communicated with a smoke exhaust hood, and the bottom end of the smoke exhaust hood is sleeved on the top end of the combustion shell and is sealed and matched.

[0024] Further, the smoke exhaust hood is internally provided with a first smoke exhaust cavity section and a second smoke exhaust cavity section, the first smoke exhaust cavity section is penetrated through the top end of the combustion cavity, the bottom end of the second smoke exhaust cavity section is communicated to one side of the first smoke exhaust cavity section, the inner wall of the second smoke exhaust cavity section is provided with a guide inclined surface, and the exhaust inlet of the exhaust fan is communicated with the top end of the second smoke exhaust cavity section.

[0025] Further, the exhaust outlet of the exhaust fan is communicated with a smoke exhaust pipeline.

[0026] Further, the burner assembly comprises a gas distribution rod mechanism, a combustion head and a plurality of gas nozzles, the gas distribution rod mechanism comprises a main gas pipe and a plurality of branch gas pipes, the branch gas pipes are provided with the combustion head and the plurality of gas nozzles, the plurality of gas nozzles are communicated with the branch gas pipes and guide the gas to be sprayed to the combustion head.

[0027] In summary, the utility model has the following technical effects:

[0028] 1. In the use process, the exhaust fan and the air blower can be started at the same time, so that the combustion waste gas generated in the combustion cavity can flow upwards under the suction force of the exhaust fan at the top end of the combustion cavity, and the air blower blows air downwards to flow upwards and assist the combustion waste gas in the combustion cavity to flow upwards, so that the exhaust fan and the air blower can work cooperatively, a stronger air flow force can be formed, the wind pressure can be doubled by series connection, even in the case that the smoke exhaust pipeline is long or the installation environment is complex, the pipeline resistance can be easily overcome, the waste gas can be efficiently exhausted outside, the risk of waste gas residue and backflow is reduced, and the smoke exhaust is ensured smooth.

[0029] 2. In terms of combustion sufficiency, the exhaust fan at the top can form a certain negative pressure environment above the combustion cavity, which helps air to enter the combustion chamber more smoothly, and the air blower at the bottom can actively blow air into the combustion chamber to provide sufficient oxygen for combustion, so that the gas and air can be fully mixed, the combustion sufficiency is ensured, the situation that the gas is not fully combusted due to insufficient air supply or unstable air flow is reduced, and the generation of harmful gases such as carbon monoxide is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is a structural schematic view of the utility model;

[0031] Figure 2 This is a structural schematic diagram from another perspective of the present invention;

[0032] Figure 3 This is a schematic structural diagram of the heat exchange assembly of the present invention;

[0033] Figure 4 This is a schematic diagram of the assembly structure of the exhaust fan and the smoke exhaust hood of the present invention.

[0034] Among them, the meanings of the figure marks are as follows: 10, combustion shell; 20, burner assembly; 31, heat exchange shell; 32, first heat exchange pipe section; 321, bent pipe section; 33, second heat exchange pipe section; 40, exhaust fan; 411, second smoke exhaust chamber section; 412, first smoke exhaust chamber section; 42, smoke exhaust duct; 50, blower. DETAILED DESCRIPTION

[0035] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0036] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0038] See Figures 1-4 The utility model discloses a dual-fan gas water heater, including a combustion shell 10, a burner assembly 20, a heat exchange assembly, an exhaust fan 40 and a blower 50. A combustion chamber is provided in the combustion shell 10, and the burner assembly 20 is provided in the combustion chamber and is used to introduce gas and burn it.

[0039] The above-mentioned heat exchange component includes a heat exchange tube, which can exchange heat with the combustion heat in the combustion chamber, and one end of the heat exchange tube is connected to the water inlet pipe, and the other end of the heat exchange tube is connected to the water outlet pipe. In this way, the water inlet pipe can introduce cold water into the heat exchange tube, and heat is exchanged with the combustion heat of the heat exchange tube and the combustion chamber. After the heat exchange, the water in the heat exchange tube becomes hot and is then discharged through the water outlet pipe.

[0040] Specifically, the above-mentioned suction fan 40 is installed at the top end of the combustion housing 10, and the air inlet of the suction fan 40 is communicated with the top end of the combustion chamber. The air blower 50 is installed at the bottom end of the combustion housing 10, and the air outlet of the air blower 50 is communicated with the bottom end of the combustion chamber.

[0041] On the basis of the above structure, when the gas water heater with the double-fan is used, the gas can be introduced through the burner assembly 20, and combustion can be carried out in the combustion chamber. The combustion heat generated can be used for heat exchange with the cold water introduced into the heat exchange pipe through the water inlet pipe. The cold water in the heat exchange pipe is heated by the combustion heat for heat exchange, and the heated hot water is then guided out of the water heater through the water outlet pipe to realize hot water use.

[0042] During use, the suction fan 40 and the air blower 50 can be started at the same time. In this way, the combustion exhaust gas generated in the combustion chamber can flow upward under the suction force of the suction fan 40 at the top end of the combustion chamber, and the air blower 50 blows air downward to assist the upward flow of the combustion exhaust gas in the combustion chamber. The suction fan 40 and the air blower 50 can work cooperatively to form stronger air flow power. The wind pressure can be doubled by the series connection of the two, so that the pipe resistance can be easily overcome even in the case of a long or complex installation environment of the exhaust pipe 42, and the exhaust gas can be efficiently discharged outdoors, reducing the risk of exhaust gas residue and backflow and ensuring smooth exhaust.

[0043] In addition, in terms of combustion sufficiency, the suction fan 40 above can form a certain negative pressure environment above the combustion chamber, which helps air to enter the combustion chamber more smoothly. At the same time, the air blower 50 below can actively blow air into the combustion chamber to provide sufficient oxygen for combustion, so that the gas and air can be fully mixed to ensure the sufficiency of combustion, thereby reducing the situation of insufficient air supply or unstable air flow leading to insufficient gas combustion, and further reducing the generation of harmful gases such as carbon monoxide.

[0044] It should be further noted that since the suction fan 40 above and the air blower 50 below are provided, the suction fan 40 and the air blower 50 work cooperatively during exhaust gas discharge, so that the working load of the single fan can be reduced, thereby reducing the working pressure and wear degree of each fan. Compared with the water heater with only one fan, the service life of the double-fan system is longer. In some special cases, such as when dust or debris is adsorbed on the fan blades, the two fans can work alternately to clean the dirt on the blades by means of reverse airflow, thereby maintaining the good running state of the fan.

[0045] Further, the heat exchange assembly in the embodiment includes a heat exchange shell 31, which is installed at the top end of the combustion shell 10. The heat exchange shell 31 is internally provided with a heat exchange cavity, the heat exchange tube can exchange heat with the heat exchange cavity, and the heat exchange cavity is in communication with the combustion cavity. The air suction fan 40 is installed at the top end of the heat exchange shell 31, and the air inlet of the air suction fan 40 is in communication with the top end of the heat exchange cavity.

[0046] Therefore, when the top end air suction operation is performed, the air suction fan 40 is started, the combustion exhaust gas generated in the combustion shell 10 can flow upward, and the air blower 50 below blows air upward to guide the exhaust gas in the combustion cavity to be quickly discharged, and the combustion heat in the combustion cavity can also be quickly transferred to the heat exchange cavity and the heat exchange tube for heat exchange, thereby improving the heat exchange efficiency, and thus the hot water heating efficiency can be effectively improved.

[0047] Further, the heat exchange tube includes at least two first heat exchange tube segments 32 penetrating into the heat exchange cavity, and adjacent two first heat exchange tube segments 32 are in communication with each other; the water inlet pipe is in communication with one of the first heat exchange tube segments 32, and the water outlet pipe is in communication with another first heat exchange tube segment 32.

[0048] Therefore, when the heat exchange is performed, the water flow is directly guided and exchanged by the first heat exchange tube segment 32 penetrating into the heat exchange cavity, and the first heat exchange tube segment 32 directly exchanges heat with the combustion heat in the heat exchange cavity, so that the heat exchange efficiency is higher. In order to improve the heat exchange path of the heat exchange tube, at least two first heat exchange tube segments 32 are used, and the first heat exchange tube segment 32 is a straight tube segment, so that the water flow is reduced. The water flow is directly exchanged with the heat of the heat exchange cavity, and the heat exchange efficiency is high.

[0049] The communication between the adjacent two first heat exchange tube segments 32 can be conducted by a curved tube segment 321, which can be located outside the heat exchange shell 31. The curved tube segment 321 is used for water flow communication between the adjacent two first heat exchange tube segments 32, and does not directly participate in heat exchange, so even if there is scaling in the curved tube segment 321, the water flow in the curved tube segment 321 does not directly participate in heat exchange, so the influence on the heat exchange efficiency is not obvious.

[0050] Further, the heat exchange tube further includes a second heat exchange tube segment 33, which is wound outside the heat exchange shell 31 and in communication with one of the first heat exchange tube segments 32, and the water inlet pipe is in communication with the second heat exchange tube segment 33. Therefore, the second heat exchange tube segment 33 of the heat exchange tube can be wound at the bottom end of the heat exchange shell 31, the second heat exchange tube segment 33 is in full contact with the part of the heat exchange shell 31 close to the combustion cavity in a ring shape, preliminary heat exchange is realized, and then the second heat exchange tube segment 33 flows into the first heat exchange tube segment 32 in the heat exchange cavity to directly exchange heat with the combustion flue gas. Therefore, the combustion heat can be fully utilized from the outside to the inside, so that the combustion utilization rate is high, and the heat exchange effect is high.

[0051] Further, a first connecting edge is protruded from the top end of the combustion shell 10, and a second connecting edge is protruded from the bottom end of the heat exchange shell 31. The first connecting edge is abutted and connected with the second connecting edge. When the heat exchange shell 31 is assembled with the combustion shell 10, the heat exchange shell 31 is positioned by abutting the second connecting edge with the first connecting edge, and then the heat exchange shell 31 is connected with the combustion shell 10 by screws or bolts arranged in the first connecting edge and the second connecting edge. Thus, the assembly and disassembly are convenient, and the installation structure is stable.

[0052] Of course, a sealing rubber ring or a sealing rubber gasket can be clamped between the first connecting edge and the second connecting edge to achieve heat exchange at the connecting position, reduce the overflow of the internal flue gas and heat loss.

[0053] Further, the air inlet of the exhaust fan 40 is communicated with a flue gas hood, and the bottom end of the flue gas hood is sleeved with the top end of the combustion shell 10 and is sealed. Thus, the suction force generated by the exhaust fan 40 can be guided to the flue gas hood through the combustion exhaust gas, and a stable air flow field can be formed in the flue gas hood. Thus, the airflow turbulence in the flue gas discharge process is reduced, and the wind noise is reduced.

[0054] Specifically, the flue gas hood is provided with a first flue gas cavity section 412 and a second flue gas cavity section 411. The first flue gas cavity section 412 is communicated with the top end of the combustion cavity, and the bottom end of the second flue gas cavity section 411 is communicated to one side of the first flue gas cavity section 412. The inner wall of the second flue gas cavity section 411 is provided with a guide slope. The air inlet of the exhaust fan 40 is communicated with the top end of the second flue gas cavity section 411. When the combustion exhaust gas is discharged, the combustion exhaust gas can first enter the first flue gas cavity section 412 and then be guided out through the guide slope of the second flue gas cavity section 411. The airflow is guided by the guide slope to prevent the sudden corner problem caused by the straight corner connection, thereby reducing the turbulence, smoothly discharging the wind speed, and reducing the wind noise.

[0055] In addition, the first flue gas cavity section 412 and the second flue gas cavity section 411 form a detour discharge path in the flue gas hood. When the air outlet of the exhaust fan backflows, the airflow can also be slowed down by the detour flue gas hood, thereby reducing the internal wind pressure instability caused by excessive external wind force, and thereby reducing the problems of difficult ignition, unstable combustion, or sudden extinguishing caused by excessive external wind pressure.

[0056] Further, the air outlet of the exhaust fan 40 is communicated with a flue gas duct 42. The flue gas duct 42 can be communicated to the outside. When the gas water heater is used in a house car, the flue gas duct 42 can be communicated to the outside of the house car. When the gas water heater is used at home, the flue gas duct 42 can be communicated to the outside. Thus, when the flue gas is discharged, the combustion exhaust gas in the combustion shell 10 can be guided into the flue gas duct 42, and then discharged through the flue gas duct 42.

[0057] Further, the burner assembly 20 comprises a gas distribution rod mechanism, a combustion head and a plurality of gas nozzles, and the gas distribution rod mechanism comprises a main gas pipe and a plurality of branch gas pipes.

[0058] Specifically, when combustion is carried out, the gas pipe is in communication with the main gas pipe, and after the gas enters from the main gas pipe, it is dispersed and evenly distributed by the branch gas pipe, ensuring that the gas can be evenly distributed to each combustion site of the burner.

[0059] The gas is transported to the gas nozzle through the branch gas pipe and is sprayed out under a certain pressure, mixed with the air entering through the air inlet, thus realizing rapid mixing of the gas and the air, and then ignited by the ignition device at the combustion head for combustion, with higher combustion efficiency.

[0060] The technical means disclosed in the utility model scheme is not limited to the technical means disclosed in the above-mentioned embodiments, but also includes technical solutions composed of any combination of the above technical features. It should be noted that, for ordinary skilled persons in the art, without departing from the principles of the utility model, a number of improvements and refinements can be made, and these improvements and refinements are also considered within the protection scope of the utility model.

Claims

1. A dual fan gas water heater characterized by The utility model provides a kind of gas-fired water heater, including, Combustion shell, combustion cavity is equipped in the combustion shell; Combustor assembly, the combustor assembly is located in the combustion cavity, and is used to guide into gas and carry out combustion; Heat exchange assembly, the heat exchange assembly includes heat exchange pipe, the heat exchange pipe is used to exchange heat with the combustion heat in the combustion cavity;One end of the heat exchange pipe is communicated with water inlet pipe, the other end of the heat exchange pipe is communicated with water outlet pipe; Exhaust fan, the exhaust fan is installed at the top end of the combustion shell, and the air inlet of the exhaust fan is communicated with the top end of the combustion cavity; Blower, the blower is installed at the bottom end of the combustion shell, and the air outlet of the blower is communicated with the bottom end of the combustion cavity.

2. The dual-fan gas water heater of claim 1, wherein, The heat exchange assembly includes heat exchange shell, the heat exchange shell is installed at the top end of the combustion shell;The heat exchange cavity is equipped in the heat exchange shell, and the heat exchange cavity is communicated with the combustion cavity;The exhaust fan is installed at the top end of the heat exchange shell, and the air inlet of the exhaust fan is communicated with the top end of the heat exchange cavity.

3. The dual-fan gas water heater of claim 2, wherein, The heat exchange pipe includes at least two first heat exchange pipe sections penetrating in the heat exchange cavity, and adjacent two first heat exchange pipe sections are communicated with each other;The water inlet pipe is communicated with one of the first heat exchange pipe sections, and the water outlet pipe is communicated with another first heat exchange pipe section.

4. The dual-fan gas water heater of claim 3, wherein, The heat exchange pipe further includes second heat exchange pipe section, and the second heat exchange pipe section is arranged around the outside of the heat exchange shell and communicated with one of the first heat exchange pipe sections;The water inlet pipe is communicated with the second heat exchange pipe section.

5. The dual-fan gas water heater of claim 3, wherein, Adjacent two first heat exchange pipe sections are communicated with curved pipe section, and the curved pipe section protrudes from the heat exchange shell.

6. The dual-fan gas water heater of claim 2, wherein, The top end of the combustion shell is provided with first connecting edge around the circumference, and the bottom end of the heat exchange shell is provided with second connecting edge around the circumference;The first connecting edge is abutted and connected with the second connecting edge.

7. The dual-fan gas water heater of any one of claims 1-6, wherein, The air inlet of the exhaust fan is communicated with smoke exhaust hood, and the bottom end of the smoke exhaust hood is sleeved on the top end of the combustion shell and sealingly matched.

8. The dual-fan gas water heater of claim 7, wherein, The smoke exhaust hood is provided with first smoke exhaust cavity section and second smoke exhaust cavity section, the first smoke exhaust cavity section is penetrated with the top end of the combustion cavity, and the bottom end of the second smoke exhaust cavity section is communicated to one side of the first smoke exhaust cavity section;The inner wall of the second smoke exhaust cavity section is provided with guide inclined surface;The air inlet of the exhaust fan is communicated with the top end of the second smoke exhaust cavity section.

9. The dual-fan gas water heater of claim 7, wherein, The air outlet of the exhaust fan is communicated with smoke exhaust pipeline.

10. The dual-fan gas water heater of any one of claims 1-6, wherein, The combustor assembly includes gas distribution rod mechanism, combustion head and multiple gas nozzles, the gas distribution rod mechanism includes main gas pipe and multiple branch gas pipes;The branch gas pipe is provided with combustion head and multiple gas nozzles, and multiple gas nozzles are communicated with the branch gas pipe and guide gas to spray to the combustion head.

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