Gas water heating device

Abstract

The utility model discloses a gas water heating device, which relates to the field of water heating equipment and comprises a combustion device, a first heat exchanger, a fan and a second heat exchanger. The fan is used for driving high-temperature flue gas generated by the combustion device to sequentially flow through the first heat exchanger and the second heat exchanger; the second heat exchanger comprises a shell, a heat exchange component is arranged in the shell, smoke flowing into the second heat exchanger after flowing through the first heat exchanger exchanges heat with water flow entering the second heat exchanger through the heat exchange component, the shell is provided with a condensate water drainage part, and condensate water generated on the heat exchange component can flow to the condensate water drainage part; an inner cavity of the condensate water atomization device is communicated with the condensate water drainage part so that condensate water can flow into the inner cavity, and the condensate water atomization device is provided with an airflow inlet, an airflow outlet, a flow guide channel and the like. The problem that a condensate water atomization device is low in atomization efficiency can be solved.

Description

Technical Field

[0001] This utility model relates to the technical field of water heating equipment, and in particular to a gas-fired hot water device. Background Technology

[0002] In the field of gas water heaters, to improve energy conversion efficiency, a condensing heat exchanger is usually installed downstream of the main heat exchanger. When water flows through the condensing heat exchanger and exchanges heat with the flue gas, water vapor in the flue gas is cooled and precipitated, forming condensate on the surface of the condensing heat exchanger. To avoid the need for an external drain pipe to discharge the condensate, existing technology incorporates a condensate atomizing device inside the gas water heater, atomizing the condensate before it is discharged along with the flue gas.

[0003] However, the condensate atomization chamber in current gas water heaters is limited by the internal structure, resulting in a relatively small space. Under these circumstances, existing condensate atomization devices, due to insufficient space, cannot achieve efficient atomization of the condensate, leading to low atomization efficiency and consequently, a low condensate discharge rate, failing to meet actual usage requirements and necessitating further improvement. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a gas-fired water heating device that can solve the problem of low atomization efficiency of condensate atomizing device.

[0005] The specific technical solution of this utility model embodiment is as follows:

[0006] A gas-fired water heating device includes a combustion device, a first heat exchanger, a fan, and a second heat exchanger. The combustion device is located upstream of the first heat exchanger, and the second heat exchanger is located downstream of the first heat exchanger. The fan is used to drive the high-temperature flue gas generated by the combustion device to flow sequentially through the first heat exchanger and the second heat exchanger.

[0007] The second heat exchanger includes a shell, and a heat exchange component is provided inside the shell for exchanging heat between the flue gas flowing into the second heat exchanger after passing through the first heat exchanger and the water flowing into the second heat exchanger. The shell is provided with a condensate drain section, and the condensate generated on the heat exchange component can flow to the condensate drain section.

[0008] The gas-fired water heater also includes a condensate atomizing device. The inner cavity of the condensate atomizing device is connected to the condensate drain section so that the condensate flows into the inner cavity. The condensate atomizing device is provided with an airflow inlet, an airflow outlet, and a guide channel. The guide channel and the inner cavity have a connecting port. The airflow flowing into the condensate atomizing device from the airflow inlet flows sequentially through the guide channel, the connecting port, the inner cavity, and the airflow outlet before flowing out of the condensate atomizing device. The area of ​​the connecting port is larger than the area of ​​the airflow inlet to disperse the airflow flowing in from the airflow inlet.

[0009] Preferably, the condensate atomizing device includes a housing and an atomizing module and a flow guiding component disposed on the housing. The interior of the housing is the inner cavity, and the flow guiding channel is formed within the flow guiding component. The atomizing module is disposed on the housing for atomizing the condensate flowing into the housing. The housing is provided with a condensate inlet, which is connected to the condensate drain section.

[0010] Preferably, the flow guiding component is disposed within the housing, the airflow inlet and the airflow outlet are formed on the housing, and the communication port is formed on the flow guiding component and located within the housing;

[0011] Alternatively, the flow guiding component is disposed outside the housing, the airflow inlet is formed on the flow guiding component, and the airflow outlet and the communication port are disposed on the housing;

[0012] The airflow entering the housing from the airflow inlet flows sequentially through the guide channel in the guide component and the connecting port before entering the housing, and carries the atomized condensed water mist out from the airflow outlet.

[0013] Preferably, the airflow guiding component is disposed on the first side of the housing, and the airflow outlet is disposed on the second side of the housing opposite to the first side of the housing or on the top of the housing.

[0014] Preferably, the flow guiding component is disposed on the first side of the housing, and the flow guiding component is composed of a portion of the first side of the housing and a flow guiding shroud disposed on the first side of the housing.

[0015] Preferably, the flow guiding component is disposed within the housing, the flow guiding shroud extends downward from the airflow inlet, the communication port is disposed on the flow guiding component, and the communication port is formed by the end of the flow guiding shroud and a guide plate disposed at the lower part of the end of the flow guiding shroud.

[0016] Preferably, the guide plate is arranged in a generally horizontal direction.

[0017] Preferably, the housing further includes: a third side and a fourth side connected to and disposed opposite to the first side of the housing; the airflow inlet is disposed on the first side, and the airflow guide includes a first baffle disposed above the airflow inlet and a second baffle opposite to the airflow inlet, wherein the first baffle, the second baffle, a portion of the third side of the housing and a portion of the fourth side of the housing enclose and form the airflow guide.

[0018] Preferably, the length of the connecting port is greater than the length of the airflow inlet.

[0019] Preferably, the connecting opening is flat and the width of the connecting opening is less than 30mm.

[0020] Preferably, the angle between the airflow direction entering the inner cavity through the connecting port and the liquid surface of the inner cavity is between -45° and 45°.

[0021] Preferably, the communication port is arranged substantially horizontally so that the airflow entering the inner cavity flows into the inner cavity substantially horizontally.

[0022] Preferably, the communication port is a plurality of openings arranged in a generally horizontal manner, and the total length of the plurality of openings is greater than the length of the airflow inlet.

[0023] Preferably, it further includes a flow-slowing cavity, through which the airflow entering from the airflow inlet passes through the flow-slowing cavity and then enters the housing through the connecting port.

[0024] Preferably, the flow guiding channel includes the flow-slowing cavity, and the cross-sectional area of ​​the flow-slowing cavity is larger than the airflow inlet area.

[0025] Preferably, the atomization module is an ultrasonic atomization device, which has a preset liquid level range for efficient atomization; the atomization module further includes a first liquid level detection device, the first detection position of which is located within the preset liquid level range.

[0026] Preferably, the lowest point of the connection port is higher than the first detection position, and the distance between the lowest point of the connection port and the first detection position is less than 30mm.

[0027] Preferably, the height of the airflow inlet is higher than the height of the connecting opening.

[0028] Preferably, the airflow inlet is connected to the interior of the housing or near the flue gas inlet of the housing.

[0029] Preferably, it further includes an inlet pipe, the inlet of which is located inside the housing or near the flue gas inlet of the housing, and the outlet of which is connected to the airflow inlet.

[0030] Preferably, the inlet of the fan is connected to the flue gas outlet of the first heat exchanger, and the outlet of the fan is connected to the flue gas inlet of the second heat exchanger.

[0031] Preferably, the outer casing is provided with a flue gas outlet, and the airflow outlet is connected to the flue gas outlet.

[0032] Preferably, it further includes an outlet pipe, the inlet of which is connected to the gas flow outlet, and the outlet of which is located at the flue gas outlet or inside the housing near the flue gas outlet.

[0033] Preferably, the device further includes a controller connected to the first detection device and the ultrasonic atomizing device. When the first detection device detects that the liquid level in the inner cavity has reached the first detection position, the controller increases the power of the ultrasonic atomizing device.

[0034] The technical solution of this utility model has the following significant beneficial effects:

[0035] The gas-fired water heater in this application uses a fan to drive the high-temperature flue gas generated by the combustion device to flow sequentially through the first heat exchanger and the second heat exchanger. Water to be heated passes through the second heat exchanger and then the interior of the first heat exchanger, exchanging heat with the flue gas to achieve heating. After passing through the first heat exchanger, the flue gas flows into the second heat exchanger and exchanges heat with the water entering the second heat exchanger through heat exchange components, forming condensate on the heat exchange components. The condensate flows through the condensate drain into the inner cavity of the condensate atomizing device. The airflow entering the condensate atomizing device from the airflow inlet flows sequentially through the guide channel, the connecting port, the inner cavity, and the airflow outlet before exiting the condensate atomizing device, thus carrying away the condensate mist formed by atomizing the condensate in the inner cavity and discharging it from the condensate atomizing device. During this process, the condensed water mist formed in the inner cavity is carried away and discharged from the condensed water atomizing device. This facilitates the formation of new condensed water mist in the inner cavity, which greatly improves the atomization efficiency in the inner cavity of the condensed water atomizing device, thereby increasing the rate at which condensed water is discharged from the condensed water atomizing device.

[0036] Specific embodiments of the present invention are disclosed in detail with reference to the following description and accompanying drawings, indicating how the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope. Features described and / or shown for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments. Attached Figure Description

[0037] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, under the guidance of this invention, can select various possible shapes and proportions to implement this invention according to specific circumstances.

[0038] Figure 1 This is a schematic diagram of the internal structure of the gas-fired water heater in an embodiment of this utility model;

[0039] Figure 2 This is a cross-sectional schematic diagram of the second heat exchanger and the condensate atomizing device in an embodiment of this utility model;

[0040] Figure 3 This is a cross-sectional view of the condensate atomizing device in one angle in an embodiment of this utility model;

[0041] Figure 4 This is a cross-sectional view of the condensate atomizing device in an embodiment of this utility model from another angle.

[0042] The reference numerals in the above figures are as follows:

[0043] 1. Combustion device; 2. First heat exchanger; 3. Fan; 4. Second heat exchanger; 41. Shell; 411. Flue gas outlet; 42. Heat exchange component; 43. Condensate drain; 5. Condensate atomizing device; 51. Inner cavity; 52. Airflow inlet; 53. Airflow outlet; 54. Guide channel; 541. Slow flow chamber; 55. Connecting port; 56. Shell; 561. Condensate inlet; 562. First side; 563. Second side; 564. Third side; 57. Atomizing module; 58. Guide component; 581. Guide shroud; 5811. First baffle; 5812. Second baffle; 59. Guide plate; 6. Inlet pipe; 7. Outlet pipe. Detailed Implementation

[0044] The details of this utility model can be more clearly understood by referring to the accompanying drawings and the description of specific embodiments. However, the specific embodiments of this utility model described herein are only for explaining the purpose of this utility model and should not be construed as limiting this utility model in any way. Under the teachings of this utility model, those skilled in the art can conceive of any possible modifications based on this utility model, and these should all be considered to fall within the scope of this utility model. It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there may be an intervening element. The terms "mounted," "connected," and "connected" should be interpreted broadly, for example, it can be a mechanical connection or an electrical connection, or it can be a connection within two elements, which can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0046] In order to solve the problem of low atomization efficiency of the condensate atomizing device 5, this application proposes a gas-fired hot water device. Figure 1 This is a schematic diagram of the internal structure of the gas-fired water heater in an embodiment of this utility model. Figure 2 This is a cross-sectional schematic diagram of the second heat exchanger and the condensate atomizing device in an embodiment of this utility model, as shown below. Figure 1 and Figure 2As shown, the gas-fired water heater includes a combustion device 1, a first heat exchanger 2, a fan 3, and a second heat exchanger 4. The combustion device 1 is located upstream of the first heat exchanger 2, and the second heat exchanger 4 is located downstream of the first heat exchanger 2. The fan 3 drives the high-temperature flue gas generated by the combustion device 1 to flow sequentially through the first heat exchanger 2 and the second heat exchanger 4. The second heat exchanger 4 includes a shell 41, inside which is a heat exchange component 42 for exchanging heat between the flue gas flowing into the second heat exchanger 4 after passing through the first heat exchanger 2 and the water flowing into the second heat exchanger 4. The shell 41 is provided with a condensate drain 43, and the condensate generated on the heat exchange component 42 can flow to the condensate drain. Water section 43; the gas-fired water heater also includes a condensate atomizing device 5. The inner cavity 51 of the condensate atomizing device 5 is connected to the condensate drain section 43 so that condensate flows into the inner cavity 51. The condensate atomizing device 5 is provided with an airflow inlet 52, an airflow outlet 53 and a guide channel 54. The guide channel 54 and the inner cavity 51 have a connecting port 55. The airflow flowing into the condensate atomizing device 5 from the airflow inlet 52 flows through the guide channel 54, the connecting port 55, the inner cavity 51 and the airflow outlet 53 in sequence and then flows out of the condensate atomizing device 5. The area of ​​the connecting port 55 is larger than the area of ​​the airflow inlet 52 so as to disperse the airflow flowing in from the airflow inlet 52.

[0047] The gas-fired water heater in this application uses a fan 3 to drive the combustion device 1, generating high-temperature flue gas that flows sequentially through a first heat exchanger 2 and a second heat exchanger 4. Water to be heated passes sequentially through the second heat exchanger 4 and the interior of the first heat exchanger 2, exchanging heat with the flue gas to achieve heating. The flue gas flowing into the second heat exchanger 4 after passing through the first heat exchanger 2 exchanges heat with the water entering the second heat exchanger 4 via a heat exchange component 42, forming condensate on the heat exchange component 42. The condensate flows through a condensate drain 43 into the inner cavity 51 of the condensate atomizing device 5. The airflow entering the condensate atomizing device 5 from the airflow inlet 52 flows sequentially through a guide channel 54, a connecting port 55, the inner cavity 51, and the airflow outlet 53 before exiting the condensate atomizing device 5, thus carrying away the condensate mist formed by the atomization of the condensate in the inner cavity 51 and discharging it from the condensate atomizing device 5. During this process, the condensed water mist formed in the inner cavity 51 can be carried away and discharged from the condensed water atomizing device 5. This is conducive to the formation of new condensed water mist in the inner cavity 51, which greatly improves the atomization efficiency in the inner cavity 51 of the condensed water atomizing device 5, thereby increasing the rate at which condensed water is discharged from the condensed water atomizing device 5.

[0048] like Figure 1As shown, combustion device 1 mixes the gas and air input into the gas-fired water heater and then burns them to form high-temperature flue gas. First heat exchanger 2 exchanges heat with the high-temperature flue gas output from combustion device 1, thereby heating the water flowing through it. After passing through first heat exchanger 2, the high-temperature flue gas is transformed into relatively low-temperature flue gas. Fan 3 drives the high-temperature flue gas generated by combustion device 1 to flow through first heat exchanger 2 and second heat exchanger 4. The flue gas after heat exchange in first heat exchanger 2 is then input into second heat exchanger 4 by fan 3 for further heat exchange, thereby heating the water passing through second heat exchanger 4. The water to be heated input into the gas-fired water heater first passes through second heat exchanger 4 and is preheated by the flue gas after heat exchange in first heat exchanger 2. The preheated water then flows back into first heat exchanger 2 for further heating, thus forming hot water at the user's required temperature, which is then output for user use.

[0049] Figure 3 This is a cross-sectional view of the condensate atomizing device in one angle in an embodiment of this utility model. Figure 4 This is a cross-sectional view of the condensate atomizing device in an embodiment of this utility model from another angle, as shown below. Figures 2 to 4 As shown, the second heat exchanger 4 may include a housing 41, inside which is a heat exchange component 42 for exchanging heat between the flue gas flowing into the second heat exchanger 4 after passing through the first heat exchanger 2 and the water flowing into the second heat exchanger 4. The flue gas, after being heated by the first heat exchanger 2, is input into the housing 41 by the fan 3, flows past the outside of the heat exchange component 42, and thus exchanges heat with the water to be heated flowing into the heat exchange component 42. Afterwards, the flue gas flows out of the housing 41 and is discharged through the exhaust pipe of the gas-fired water heater. The housing 41 is provided with a flue gas outlet 411, which is connected to the exhaust pipe of the gas-fired water heater so that the flue gas flows out of the flue gas outlet 411 of the housing 41 and is discharged from the exhaust pipe. When the flue gas exchanges heat with the water to be heated flowing through the heat exchange component 42, the water vapor in the flue gas is further cooled down and condenses into liquid on the heat exchange component 42. The condensate precipitated on the heat exchange component 42 falls into the outer shell 41 and finally flows out from the condensate drain 43 of the outer shell 41.

[0050] Since the gas-fired water heater includes a condensate atomizing device 5, and the inner cavity 51 of the condensate atomizing device 5 is connected to the condensate drain section 43, the condensate flowing out of the condensate drain section 43 of the outer shell 41 flows into the inner cavity 51 of the condensate atomizing device 5. The condensate atomizing device 5 is provided with an airflow inlet 52, an airflow outlet 53, and a guide channel 54. The guide channel 54 and the inner cavity 51 have a connecting port 55. The airflow flowing into the condensate atomizing device 5 from the airflow inlet 52 flows sequentially through the guide channel 54, the connecting port 55, the inner cavity 51, and the airflow outlet 53 before flowing out of the condensate atomizing device 5, thereby carrying away the condensate mist formed after the condensate in the inner cavity 51 and discharging it from the condensate atomizing device 5. In this process, carrying away the condensate mist formed in the inner cavity and discharging it from the condensate atomizing device is beneficial for the formation of new condensate mist in the inner cavity, thus improving the atomization efficiency in the inner cavity of the condensate atomizing device and increasing the rate at which condensate is discharged from the condensate atomizing device.

[0051] Furthermore, the area of ​​the connecting port 55 can be larger than the area of ​​the airflow inlet 52, thereby dispersing the airflow flowing in from the airflow inlet 52. When the dispersed gas flows through the inner cavity 51 of the condensate atomizing device 5, it can carry away more of the condensate mist formed in the inner cavity 51 and discharge it from the condensate atomizing device 5. This is conducive to the formation of new condensate mist in the inner cavity 51, thus greatly improving the atomization efficiency in the inner cavity 51 of the condensate atomizing device 5, and thereby increasing the rate at which condensate is discharged from the condensate atomizing device 5.

[0052] In one feasible implementation, such as Figures 2 to 4 As shown, the airflow outlet 53 can be connected to the flue gas outlet 411, thereby connecting to the exhaust pipe of the gas water heater. Through this structure, the condensate water mist in the inner cavity 51 can pass through the airflow outlet 53 and the flue gas outlet 411 of the outer shell 41 in sequence, and then be discharged from the exhaust pipe of the gas water heater.

[0053] Specifically, the gas-fired water heater may include an outlet pipe 7. The inlet of the outlet pipe 7 is connected to the gas outlet 53, and the outlet of the outlet pipe 7 is located at the flue gas outlet 411 or inside the casing 41 near the flue gas outlet 411.

[0054] like Figures 2 to 4As shown, the condensate atomizing device 5 may include a housing 56 and an atomizing module 57 and a flow guiding component 58 disposed on the housing 56. The interior of the housing 56 is an inner cavity 51. A flow guiding channel 54 may be formed within the flow guiding component 58. Alternatively, the flow guiding component 58 may be disposed within the housing 56, with an airflow inlet 52 and an airflow outlet 53 formed on the housing 56, and a connecting port 55 formed on the flow guiding component 58 and located within the housing 56. This method can further reduce the volume of the condensate atomizing device 5. Alternatively, the flow guiding component 58 may be disposed outside the housing 56, with an airflow inlet 52 formed on the flow guiding component 58, and an airflow outlet 53 and a connecting port 55 disposed on the housing 56. In both embodiments described above, the airflow entering the housing 56 from the airflow inlet 52 flows sequentially through the flow guiding channel 54 and the connecting port 55 within the flow guiding component 58 before entering the housing 56, carrying the atomized condensate mist out through the airflow outlet 53.

[0055] The atomizing module 57 is disposed on the housing 56 to atomize the condensate flowing into the housing 56, thereby forming a condensate mist. For example, the atomizing module 57 can use an ultrasonic atomizing device to generate water mist, and can include single-crystal piezoelectric ceramic, microporous mesh, Langevin transducer, etc., based on different principles. Other types of atomizing modules 57 can also be used in this application, and no limitation is made here.

[0056] like Figure 2 As shown, a condensate inlet 561 may be provided on the housing 56. The condensate inlet 561 is connected to the condensate drain section 43. The condensate flowing out of the condensate drain section 43 of the housing 41 flows into the inner cavity 51 of the condensate atomizing device 5 through the condensate inlet 561.

[0057] As a feasible approach, the angle between the airflow direction entering the inner cavity 51 through the connecting port 55 and the liquid surface of the inner cavity 51 is between -45° and 45°. Within this angle range, the gas flowing out of the connecting port 55 is generally directed towards the condensate liquid surface of the inner cavity 51, ensuring that the outflowing gas largely passes over or above the condensate liquid surface. This helps to carry away the condensate mist formed on the condensate liquid surface, thereby improving the atomization efficiency of the condensate atomizing device 5. Furthermore, the airflow direction entering the inner cavity 51 through the connecting port 55 is generally directed towards the liquid surface of the inner cavity 51. Furthermore, the connecting port 55 can be approximately horizontally positioned so that the airflow entering the inner cavity 51 flows into the inner cavity 51 approximately horizontally, allowing the airflow to pass over the liquid surface of the inner cavity 51. All of the above methods can immediately carry away the condensate mist generated on the liquid surface of the inner cavity 51, which helps to improve the atomization efficiency within the inner cavity 51 of the condensate atomizing device 5.

[0058] like Figures 2 to 4As shown, when the flow guiding component 58 is disposed inside or outside the housing 56, the flow guiding component 58 can be disposed on the first side 562 of the housing 56, and the airflow outlet 53 is disposed on the second side 563 of the housing 56 opposite to the first side 562 or on the top of the housing 56. This allows the gas flowing out from the connecting port 55 to pass through as much of the inner cavity 51 of the housing 56 as possible before flowing out from the airflow outlet 53, thereby carrying away more of the condensate mist formed in the inner cavity 51 and discharging it from the condensate atomizing device 5. The first side 562 of the housing 56 can be a side adjacent to the condensate atomizing device 5 and the second heat exchanger 4. This facilitates the introduction of flue gas from the second heat exchanger 4 or flue gas from the first heat exchanger 2 that is about to flow into the second heat exchanger 4 into the condensate atomizing device 5 to carry away the condensate mist.

[0059] When the flow guiding component 58 is disposed on the first side 562 of the housing 56, the flow guiding component 58 is composed of a portion of the first side 562 of the housing 56 and a flow guiding shroud 581 disposed on the first side 562 of the housing 56. This method utilizes a portion of the first side 562 of the housing 56, thereby saving on the consumables of the flow guiding component 58 and reducing the cost of the gas-fired water heater. In this embodiment, as feasible, the flow guiding component 58 can be disposed inside the housing 56, with the flow guiding shroud 581 extending downward from the airflow inlet 52, and a connecting port 55 disposed on the flow guiding component 58. The connecting port 55 is formed by the end of the flow guiding shroud 581 and a guide plate 59 disposed at the lower part of the end of the flow guiding shroud 581. The flow guiding shroud 581 can be generally inverted L-shaped, with the end of the flow guiding shroud 581 being the lower end of the vertical portion, and the horizontal portion of the flow guiding shroud 581 located above the airflow inlet 52. As feasible, the guide plate 59 is disposed approximately horizontally, so that the gas flowing out from the connecting port 55 is initially output horizontally.

[0060] In one specific implementation, such as Figures 2 to 4 As shown, the housing 56 may include a third side 564 and a fourth side 56 connected to and opposite to the first side 562 of the housing 56. The third side 564 and the fourth side 56 are located in a front-back direction perpendicular to the plane of the paper. An airflow inlet 52 is disposed on the first side 562. The flow guide shroud 581 includes a first baffle 5811 disposed above the airflow inlet 52 and a second baffle 5812 opposite to the airflow inlet 52. The first baffle 5811, the second baffle 5812, a portion of the third side 564, and a portion of the fourth side 56 of the housing 56 enclose and form the flow guide shroud 581. In this way, the distance between the flow guide channel 54 and the connecting port 55 in the direction perpendicular to the plane of the paper can be maximized, thereby increasing the cross-sectional area of ​​the flow guide channel 54 and the connecting port 55 in the gas flow direction.

[0061] To ensure that the area of ​​the connecting opening 55 is larger than the area of ​​the airflow inlet 52 in order to disperse the airflow flowing in from the airflow inlet 52, in one embodiment, the length of the connecting opening 55 can be greater than the length of the airflow inlet 52; that is, the length of the connecting opening 55 in the direction perpendicular to the plane of the paper is greater than the length of the airflow inlet 52 in the same direction. In another embodiment, the connecting opening 55 can be a plurality of generally horizontally arranged openings, the total length of which is greater than the length of the airflow inlet 52.

[0062] In one feasible implementation, such as Figures 2 to 4 As shown, the connecting port 55 can be flat, and its width can be less than 30mm. The width of the connecting port 55 is its vertical distance. By setting the shape of the connecting port 55 while ensuring its length perpendicular to the plane of the paper, the horizontal flow velocity of the gas output from the connecting port 55 can be increased. This allows the gas to flow through the inner cavity 51 of the condensate atomizing device 5 as much as possible in the horizontal direction. Since the condensate mist in the inner cavity 51 of the condensate atomizing device 5 is formed at the horizontal water surface, this allows more condensate mist formed on the water surface in the inner cavity 51 to be carried away and discharged from the condensate atomizing device 5.

[0063] To ensure that the gas flowing in from the air inlet 52 is sufficiently dispersed and flows out from the connecting port 55 into the inner cavity 51, the gas-fired water heater may include a flow-regulating chamber 541. The gas entering from the air inlet 52 passes through the flow-regulating chamber 541 and is then dispersed through the connecting port 55 into the housing 56. Furthermore, the gas entering from the air inlet 52 passes through the flow-regulating chamber 541 and then uniformly enters the housing 56 through the connecting port 55. The inlet and outlet of the flow-regulating chamber 541 are connected to the air inlet 52 and the connecting port 55, respectively, to achieve communication.

[0064] When the atomizing module 57 is an ultrasonic atomizing device, the ultrasonic atomizing device has a preset liquid level range for efficient atomization. When the condensate in the ultrasonic atomizing device is within this preset liquid level range for efficient atomization, the ultrasonic atomizing device can atomize the condensate relatively efficiently to form condensate water mist. The atomizing module 57 includes a first liquid level detection device, the first detection position of which is located within the preset liquid level range. It can be used to detect whether the liquid level of the condensate in the atomizing module 57 is within the preset liquid level range for efficient atomization, thereby facilitating the control of the power of the atomizing module 57, and ensuring that the liquid level of the condensate in the atomizing module 57 is at or below the first detection position of the first liquid level detection device.

[0065] For example, a gas-fired water heater may include a controller. The controller is electrically connected to a first detection device and an ultrasonic atomizing device. When the first detection device detects that the liquid level in the inner cavity 51 has reached a first detection position, the controller increases the power of the ultrasonic atomizing device.

[0066] In the above embodiment, the lowest point of the connecting port 55 can be higher than the first detection position, and the distance between the lowest point of the connecting port 55 and the first detection position is less than 30mm. This method allows the gas flowing out of the connecting port 55 to flow as close as possible to the level of the condensate water, thereby carrying away as much of the condensate water mist formed at the level of the condensate water as possible. This facilitates the formation of new condensate water mist at the level of the condensate water in the ultrasonic atomizing device, thus greatly improving the atomization efficiency of the ultrasonic atomizing device. Even when the liquid level of the condensate water in the atomizing module 57 is higher than the connecting port 55, the airflow flowing in from the airflow inlet 52 can force the condensate water flowing from the connecting port 55 into the guide channel 54 out of the connecting port 55, and the airflow can still flow into the inner cavity 51 in a dispersed manner through the connecting port 55.

[0067] To prevent condensate in the inner cavity 51 from flowing back into the first heat exchanger 2 and / or the second heat exchanger 4 through the airflow inlet 52 against the direction of gas flow, thus affecting the normal heat exchange of the first heat exchanger 2 and / or the second heat exchanger 4, the height of the airflow inlet 52 can be higher than the height of the connecting port 55.

[0068] The airflow flowing into the condensate atomizing device 5 from the airflow inlet 52 can be the flue gas output after heat exchange in the first heat exchanger 2. In this case, the airflow inlet 52 can be connected to the vicinity of the flue gas inlet of the outer casing 41, or it can be the flue gas after at least partial heat exchange in the second heat exchanger 4. In this case, the airflow inlet 52 is connected to the inside of the outer casing 41, or it can be the flue gas output after heat exchange in the second heat exchanger 4. No limitations are made in this application.

[0069] In one specific implementation, such as Figures 2 to 4As shown, the gas-fired water heater may include an inlet pipe 6. The inlet of the inlet pipe 6 is located inside the outer casing 41 or near the flue gas inlet of the outer casing 41, and the outlet of the inlet pipe 6 is connected to the airflow inlet 52. In this way, the flue gas that has undergone at least partial heat exchange in the second heat exchanger 4 or the flue gas output after heat exchange in the first heat exchanger 2 can be directly guided to the airflow inlet 52 through the inlet pipe 6. In this way, the flue gas entering the airflow inlet 52 through the inlet pipe 6 does not exchange heat with the water to be heated flowing through the second heat exchanger 4, or only exchanges a small amount of heat with the water to be heated flowing through the second heat exchanger 4. Compared with the flue gas that has completely undergone heat exchange in the second heat exchanger 4, the flue gas entering the airflow inlet 52 through the inlet pipe 6 can maintain a relatively high temperature. In this way, when the flue gas enters the inner cavity 51, it can avoid the condensate mist in the inner cavity 51 from turning back into droplets due to the low temperature and being unable to be carried out by the flue gas to the condensate atomizing device 5. This is beneficial for carrying away the condensate mist formed in the inner cavity 51 and discharging it from the condensate atomizing device 5.

[0070] In one embodiment, the flow channel 54 may include a flow-retarding cavity 541, the cross-sectional area of ​​which is larger than the area of ​​the airflow inlet 52 in the gas flow direction. The flow-retarding cavity 541 can reduce the gas flow velocity, achieving a stable and uniform airflow, thereby allowing the gas to enter the inner cavity 51 through the connecting port 55 at a lower flow velocity and in a stable and uniform flow. For gas-fired water heaters, the power of the fan 3 is mainly adjusted to match the combustion power of the gas-fired water heater. For condensate atomizing devices, the driving force for the gas entering the inlet pipe 6 is provided by the fan 3. Therefore, the gas flow velocity is determined by the fan 3. However, the power of the fan 3, in order to match the combustion power of the gas-fired water heater, results in a gas flow velocity in the inlet pipe 6 that is too high to carry away the condensate mist in the inner cavity of the condensate atomizing device, which is also excessively wasteful. Therefore, a flow-retarding cavity 541 is needed to reduce and control the gas flow velocity, and at the same time, it can prepare for the gas to be dispersed and input into the inner cavity 51.

[0071] As feasible, the inlet of fan 3 can be connected to the flue gas outlet of the first heat exchanger 2, and the outlet of fan 3 can be connected to the flue gas inlet of the second heat exchanger 4. When fan 3 is located between the flue gas outlet of the first heat exchanger 2 and the flue gas inlet of the second heat exchanger 4, compared to fan 3 being located upstream of the combustion device 1, fan 3 can simultaneously ensure the velocity of flue gas flowing through the first heat exchanger 2 and the velocity of flue gas flowing through the second heat exchanger 4. In addition, it can also ensure that the flue gas can enter the inlet pipe 6 at a relatively high velocity, thereby ensuring sufficient flue gas flow to enter the condensate atomizing device 5, which is beneficial for carrying away more condensate mist formed in the inner cavity 51 and discharging it from the condensate atomizing device 5. All articles and references disclosed, including patent applications and publications, are incorporated herein by reference for various purposes. The term "consistent with essentially" in describing the combination should include the identified elements, components, parts or steps, as well as other elements, components, parts or steps that do not substantially affect the essential novel features of the combination. The use of the terms "comprising" or "including" to describe combinations of elements, components, parts, or steps herein also contemplates embodiments essentially consisting of such elements, components, parts, or steps. The use of the term "may" herein is intended to indicate that any described attribute "may" include is optional. Multiple elements, components, parts, or steps can be provided by a single integrated element, component, part, or step. Alternatively, a single integrated element, component, part, or step can be divided into multiple separate elements, components, parts, or steps. The use of "a" or "an" to describe an element, component, part, or step does not imply exclusion of other elements, components, parts, or steps.

[0072] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A gas-fired hot water device, characterized in that, The gas-fired hot water device includes a combustion device, a first heat exchanger, a fan, and a second heat exchanger. The combustion device is located upstream of the first heat exchanger, and the second heat exchanger is located downstream of the first heat exchanger. The fan is used to drive the high-temperature flue gas generated by the combustion device to flow through the first heat exchanger and the second heat exchanger successively. The second heat exchanger includes a shell, and a heat exchange component is provided inside the shell for exchanging heat between the flue gas flowing into the second heat exchanger after passing through the first heat exchanger and the water flowing into the second heat exchanger. The shell is provided with a condensate drain section, and the condensate generated on the heat exchange component can flow to the condensate drain section. The gas-fired water heater also includes a condensate atomizing device. The inner cavity of the condensate atomizing device is connected to the condensate drain section so that the condensate flows into the inner cavity. The condensate atomizing device is provided with an airflow inlet, an airflow outlet, and a guide channel. The guide channel and the inner cavity have a communication port. The airflow flowing into the condensate atomizing device from the airflow inlet flows sequentially through the guide channel, the communication port, the inner cavity, and the airflow outlet before flowing out of the condensate atomizing device.

2. The gas-fired hot water device as described in claim 1, characterized in that, The area of ​​the connecting opening is larger than the area of ​​the airflow inlet to disperse the airflow flowing in from the airflow inlet.

3. The gas-fired hot water device as described in claim 1, characterized in that, The condensate atomizing device includes a housing and an atomizing module and a flow guiding component disposed on the housing. The interior of the housing is the inner cavity, and the flow guiding channel is formed within the flow guiding component. The atomizing module is disposed on the housing for atomizing the condensate flowing into the housing. The housing is provided with a condensate inlet, which is connected to the condensate drain section.

4. The gas-fired hot water device as described in claim 3, characterized in that, The flow guiding component is disposed inside the housing, the airflow inlet and the airflow outlet are formed on the housing, and the communication port is formed on the flow guiding component and located inside the housing; Alternatively, the flow guiding component is disposed outside the housing, the airflow inlet is formed on the flow guiding component, and the airflow outlet and the communication port are disposed on the housing; The airflow entering the housing from the airflow inlet flows sequentially through the guide channel in the guide component and the connecting port before entering the housing, and carries the atomized condensed water mist out from the airflow outlet.

5. The gas-fired hot water device as described in claim 4, characterized in that, The airflow guiding component is disposed on the first side of the housing, and the airflow outlet is disposed on the second side of the housing opposite to the first side of the housing or on the top of the housing.

6. The gas-fired hot water device as described in claim 4, characterized in that, The flow guiding component is disposed on the first side of the housing, and the flow guiding component is composed of a portion of the first side of the housing and a flow guiding shroud disposed on the first side of the housing.

7. The gas-fired hot water device as described in claim 6, characterized in that, The flow guiding component is disposed within the housing, the flow guiding shroud extends downward from the airflow inlet, and the communication port is disposed on the flow guiding component. The communication port is formed by the end of the flow guiding shroud and a guide plate disposed at the lower part of the end of the flow guiding shroud.

8. The gas-fired hot water device as described in claim 7, characterized in that, The guide plate is set in a roughly horizontal direction.

9. The gas-fired hot water device as described in claim 6, characterized in that, The housing further includes: a third side and a fourth side connected to and opposite to the first side of the housing; the airflow inlet is disposed on the first side, and the airflow guide includes a first baffle disposed above the airflow inlet and a second baffle opposite to the airflow inlet, the first baffle, the second baffle, a portion of the third side and a portion of the fourth side of the housing forming the airflow guide.

10. The gas-fired hot water device as described in claim 4, characterized in that, The length of the connecting port is greater than the length of the airflow inlet.

11. The gas-fired hot water device as described in claim 10, characterized in that, The connecting port is flat and its width is less than 30mm.

12. The gas-fired hot water device as described in claim 1, characterized in that, The angle between the airflow direction entering the inner cavity through the connecting port and the liquid surface of the inner cavity is between -45° and 45°.

13. The gas-fired hot water device as described in claim 12, characterized in that, The connection port is positioned approximately horizontally so that the airflow entering the inner cavity flows into the inner cavity approximately horizontally.

14. The gas-fired hot water device as described in claim 4, characterized in that, The connection port consists of multiple openings arranged in a roughly horizontal manner, and the total length of the multiple openings is greater than the length of the airflow inlet.

15. The gas-fired hot water device as described in claim 4, characterized in that, It also includes a flow-slowing cavity, through which the airflow entering from the airflow inlet passes and then enters the housing through the connecting port.

16. The gas-fired hot water device as described in claim 15, characterized in that, The flow guiding channel includes the flow-slowing cavity, the cross-sectional area of ​​which is larger than the airflow inlet area.

17. The gas-fired hot water device as described in claim 3, characterized in that, The atomization module is an ultrasonic atomization device, which has a preset liquid level range for efficient atomization; the atomization module also includes a first liquid level detection device, the first detection position of which is located within the preset liquid level range.

18. The gas-fired hot water device as described in claim 17, characterized in that, The lowest point of the connection port is higher than the first detection position, and the distance between the lowest point of the connection port and the first detection position is less than 30mm.

19. The gas-fired hot water device as described in claim 18, characterized in that, The height of the airflow inlet is higher than the height of the connecting opening.

20. The gas-fired hot water device as described in claim 4, characterized in that, The airflow inlet is connected to the interior of the outer casing or near the flue gas inlet of the outer casing.

21. The gas-fired hot water device as described in claim 20, characterized in that, It also includes an inlet pipe, the inlet of which is located inside the housing or near the flue gas inlet of the housing, and the outlet of which is connected to the airflow inlet.

22. The gas-fired hot water device as described in claim 1, characterized in that, The inlet of the fan is connected to the flue gas outlet of the first heat exchanger, and the outlet of the fan is connected to the flue gas inlet of the second heat exchanger.

23. The gas-fired hot water device as described in claim 4, characterized in that, The outer casing is provided with a flue gas outlet, and the airflow outlet is connected to the flue gas outlet.

24. The gas-fired hot water device as described in claim 23, characterized in that, It also includes an outlet pipe, the inlet of which is connected to the gas outlet, and the outlet of which is located at the flue gas outlet or inside the housing near the flue gas outlet.

25. The gas-fired hot water device as described in claim 17, characterized in that, It also includes a controller, which is connected to the first detection device and the ultrasonic atomizing device. When the first detection device detects that the liquid level in the inner cavity has reached the first detection position, the controller increases the power of the ultrasonic atomizing device.

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