CN216953545U - Gas water heating equipment - Google Patents

Abstract

The present application relates to a gas fired water heating apparatus. A gas-fired water heating apparatus comprising: a housing having a combustion chamber and a water storage chamber surrounding the combustion chamber and spaced apart from each other; the heat exchanger is arranged in the combustion chamber; the heat exchanger is provided with a first air flow channel communicated with the combustion chamber and a first liquid flow channel used for exchanging heat with the first air flow channel; the condenser is positioned on the flow path of the airflow flowing out of the first airflow channel and is provided with a second airflow channel communicated with the first airflow channel and a second airflow channel used for exchanging heat with the second airflow channel; the second liquid flow channel is communicated with the first water inlet of the first liquid flow channel; wherein, the condenser is provided with a condensed water outlet communicated with the water storage cavity; the shell is provided with an exhaust hole communicated with the water storage cavity. Aiming at the gas water heating equipment, a pipeline for discharging condensed water is not required to be reserved, and great convenience is brought to installation and use of users.

Description

Gas water heating equipment

Technical Field

The application relates to the technical field of gas equipment, in particular to gas water heating equipment.

Background

As the condensing gas water heater is compared with the common gas water heater, the condensing heat exchanger is additionally arranged, and cold water can be preheated by utilizing the waste heat of high-temperature flue gas, so that the heat conversion efficiency is improved, and the gas cost is saved.

However, the conventional condensing gas water heater usually needs to be provided with a condensed water discharge pipe to discharge condensed water obtained by heat exchange of the condensing heat exchanger, most users purchase the water heater in a market after decoration, and a pipeline for discharging the condensed water is not reserved, so that the condensing gas water heater brings inconvenience to the users.

SUMMERY OF THE UTILITY MODEL

Therefore, it is necessary to provide a gas water heater for solving the problem of inconvenience to users of the conventional condensing gas water heater.

According to an aspect of the present application, there is provided a gas-fired water heating apparatus including:

a housing having a combustion chamber and a water storage chamber surrounding the combustion chamber and spaced apart from the combustion chamber; the water storage cavity is communicated with the external environment;

the heat exchanger is arranged in the combustion chamber; the heat exchanger is provided with a first air flow channel communicated with the combustion chamber and a first liquid flow channel used for exchanging heat with the first air flow channel; and

the condenser is positioned on the flow path of the airflow flowing out of the first airflow channel and is provided with a second airflow channel communicated with the first airflow channel and a second airflow channel used for exchanging heat with the second airflow channel; the second liquid flow channel is communicated with the first water inlet of the first liquid flow channel;

wherein, the condenser is provided with a condensed water outlet communicated with the water storage cavity.

In one embodiment, the housing is provided with an exhaust hole respectively communicated with the water storage cavity and the external environment.

In one embodiment, the housing comprises an inner wall and an outer wall surrounding the inner wall;

the combustion chamber is formed by enclosing the inner wall;

the water storage cavity is formed between the inner wall and the outer wall.

In one embodiment, the exhaust hole is arranged on the inner wall, one end of the exhaust hole is communicated with the water storage cavity, and the other end of the exhaust hole is communicated with the combustion chamber.

In one embodiment, the condenser is located outside the housing and connected to the top end of the housing such that the second airflow channel is in communication with the combustion chamber.

In one embodiment, the condensed water outlet is provided with a condensed connecting pipe connected to the housing, so that the condensed water outlet is communicated with the water storage cavity.

In one embodiment, the condenser is disposed in the combustion chamber on a downstream side of the heat exchanger to communicate the first air flow path with the second air flow path.

In one embodiment, the condensed water outlet is provided with a condensation extension pipe extending into the water storage cavity.

In one embodiment, the shell is provided with a sewage discharge pipe communicated with the water storage cavity, and a sewage discharge valve is arranged on the sewage discharge pipe.

In one embodiment, the gas-fired water heating apparatus further comprises a controller;

the shell is provided with a water level detector which is electrically connected with the controller and used for acquiring the water level value of the water storage cavity.

Above-mentioned gas hot water equipment, in the condenser use, the medium-temperature flue gas can carry out the heat transfer with the cold water that flows into in the second liquid stream inslot, cool off to dew point temperature when the temperature of this part flue gas, vapor in this part flue gas just begins the condensation and separates out, the comdenstion water that separates out can flow into the water storage intracavity from the comdenstion water export, can carry out the heat transfer with the flue gas of the high temperature in the combustion chamber, on the one hand, the comdenstion water that flows into the water storage intracavity can cool off the lateral wall of combustion chamber, on the other hand, the flue gas of high temperature can heat the water storage chamber around the combustion chamber, and heat the comdenstion water that flows into the water storage intracavity, can make this part comdenstion water become vapor and discharge, so, to this gas hot water equipment, can need not reserve the pipeline of discharging the comdenstion water, user's installation is greatly made things convenient for use.

Drawings

Fig. 1 shows a schematic structural diagram of a gas-fired water heating apparatus in an embodiment of the present application;

fig. 2 shows a schematic structural diagram of a gas-fired water heating apparatus in another embodiment of the present application.

In the figure: 10. a gas fired water heating apparatus; 110. a housing; 111. an inner wall; 112. an outer wall; 1101. a combustion chamber; 1102. a water storage cavity; 1103. an exhaust hole; 1104. a blow-off pipe; 1105. a blowoff valve; 120. a heat exchanger; 1201. a first air flow passage; 1202. a first flow channel; a. a first water inlet; b. a first water outlet; 121. heat exchange fins; 130. a condenser; 1301. a second air flow channel; 1302. a second liquid flow passage; c. a second water inlet; d. a second water outlet; 1303. a condensed water outlet; 131. a condensing connecting pipe; 132. a condensing extension pipe; 140. a burner; 150. a smoke exhaust pipe; 160. a smoke collecting hood; 170. a water level detector.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiment in many different forms than those described herein and those skilled in the art will be able to make similar modifications without departing from the spirit of the application and therefore the application is not limited to the specific embodiments disclosed below.

In the description of the present application, it is to be understood that the terms "central," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Fig. 1 shows a schematic structural diagram of a gas-fired water heating apparatus 10 in an embodiment of the present application, and fig. 2 shows a schematic structural diagram of the gas-fired water heating apparatus 10 in another embodiment of the present application.

In some embodiments, optionally, referring to fig. 1 and fig. 2, a gas-fired water heating apparatus 10 provided in an embodiment of the present application includes a housing 110, a heat exchanger 120, and a condenser 130.

Wherein, the housing 110 has a combustion chamber 1101, and a water storage cavity 1102 surrounding the combustion chamber 1101 and spaced from the combustion chamber 1101, and the heat exchanger 120 is disposed in the combustion chamber 1101, the heat exchanger 120 has a first air flow passage 1201 communicating with the combustion chamber 1101, and a first liquid flow passage 1202 for exchanging heat with the first air flow passage 1201. The burner 140 in the combustion chamber 1101 generates high temperature flue gas during the combustion process, the high temperature flue gas flows through the first air flow channel 1201 of the heat exchanger 120 to exchange heat with the water entering the first flow channel 1202, and the water entering the first flow channel 1202 can be heated to provide hot water for the user.

The condenser 130 is located on a flow path of the gas flow flowing out of the first gas flow passage 1201, and the condenser 130 has a second gas flow passage 1301 communicating with the first gas flow passage 1201, and a second liquid flow passage 1302 for exchanging heat with the second gas flow passage 1301. Wherein the second flow path 1302 communicates with the first water inlet a of the first flow path 1202. When the gas water heating device 10 is used, high-temperature flue gas exchanges heat with water in the first flow channel 1202 to obtain medium-temperature flue gas, the medium-temperature flue gas can flow into the second flow channel 1301 from the first flow channel 1201, the medium-temperature flue gas can exchange heat with cold water flowing into the second flow channel 1302 to achieve the effect of preheating the cold water, the preheated water flows into the first water inlet a of the first flow channel 1202 through the second flow channel 1302, and the part of water can be heated by the high-temperature flue gas generated by the burner 140, so that the heat conversion efficiency of the burner 140 can be improved, and gas can be saved.

The condenser 130 is provided with a condensed water outlet 1303 communicated with the water storage chamber 1102, and the water storage chamber 1102 is communicated with the external environment. It can be understood that, during the use of the condenser 130, the medium temperature flue gas can exchange heat with the cold water flowing into the second liquid flow channel 1302, when the temperature of the part of the flue gas is cooled to the dew point temperature, the water vapor in the part of the flue gas starts to condense and precipitate, the precipitated condensed water can flow into the water storage cavity 1102 from the condensed water outlet 1303, and can exchange heat with the high temperature flue gas in the combustion chamber 1101, on one hand, the condensed water flowing into the water storage cavity 1102 can cool the side wall of the combustion chamber 1101, so that the scheme of cooling the combustion chamber 1101 by using a copper material coil passing water in the conventional gas water heater can be eliminated, therefore, the gas water heating device 10 can reduce the usage amount of copper materials, and can effectively reduce the material cost of the gas water heating device 10, on the other hand, the high temperature flue gas can heat the water storage cavity 1102 surrounding the combustion chamber 1101, and heat the condensed water flowing into the water storage cavity 1102, the condensed water can be changed into steam to be discharged, so that a pipeline for discharging the condensed water is not required to be reserved for the gas water heating equipment 10, and the installation and the use of a user are greatly facilitated.

In some embodiments, optionally, referring to fig. 1 and fig. 2, the heat exchanger 120 includes a plurality of heat exchanging fins 121 arranged side by side, the first air flow channel 1201 may be formed between two adjacent heat exchanging fins 121, and the first air flow channel 1201 may also be formed between the heat exchanging fins 121 and the side wall of the combustion chamber 1101.

In some embodiments, optionally, referring to fig. 1 and fig. 2, the first flow channel 1202 has a first water inlet a and a first water outlet b disposed oppositely, the second flow channel 1302 has a second water inlet c, and a second water outlet d connected to the first water inlet a and opposite to the second water inlet c. Cold water can flow into the second liquid flow channel 1302 from the second water inlet c and exchange heat with the flue gas flowing through the condenser 130 to preheat the cold water, the preheated water flows out from the second water outlet d and flows into the first water inlet a, and then exchanges heat with the high-temperature flue gas generated by the combustion of the burner 140 in the combustion chamber 1101, so that hot water required by a user can be obtained, and the heat conversion efficiency of the burner 140 can be improved.

In some embodiments, optionally, the housing 110 is provided with vents 1103 in communication with the water storage chamber 1102 and the external environment, respectively. The flue gas with high temperature can heat the water storage cavity 1102 surrounding the combustion chamber 1101, and heat the condensed water flowing into the water storage cavity 1102, so that the condensed water can be changed into steam to be discharged from the vent 1103.

In some embodiments, referring to fig. 1 and fig. 2, the housing 110 includes an inner wall 111 and an outer wall 112 surrounding the inner wall 111, the combustion chamber 1101 is surrounded by the inner wall 111, and the water storage cavity 1102 is formed between the inner wall 111 and the outer wall 112. In this way, the combustion chamber 1101 and the water storage cavity 1102 can be separated by the inner wall 111, and the high-temperature flue gas generated by the combustion of the burner 140 in the combustion chamber 1101 can heat the condensed water in the water storage cavity 1102 by the heat conduction of the inner wall 111, and in addition, the condensed water flowing into the water storage cavity 1102 can also cool the inner wall 111, so that the service life of the gas water heating device 10 can be prolonged to a certain extent.

In some embodiments, referring to fig. 1 and fig. 2, the exhaust hole 1103 is disposed on the inner wall 111, and one end of the exhaust hole 1103 is communicated with the water storage cavity 1102, and the other end is communicated with the combustion chamber 1101.

It can be understood that the flue gas in the combustion chamber 1101 needs to be exhausted, the combustion chamber 1101 is communicated with the external environment, and then the exhaust port 1103 can be communicated with the external environment through the combustion chamber 1101.

The high-temperature flue gas can heat the water storage cavity 1102 surrounding the combustion chamber 1101, and heat the condensed water flowing into the water storage cavity 1102, so that the condensed water can be changed into steam to be discharged from the exhaust hole 1103 and into the combustion chamber 1101, and further the steam can be discharged along with the flue gas in the combustion chamber 1101, the steam can be condensed at the condenser 130 to obtain the condensed water, and the obtained condensed water can enter the water storage cavity 1102 again, so that the steam can be recycled. In addition, this water vapor may also be discharged with the flue gas from the smoke exhaust duct 150 on the downstream side of the condenser 130.

In some embodiments, optionally, referring to fig. 1 and fig. 2, the inner wall 111 is provided with at least one set of exhaust holes arranged at intervals along a central axis of the combustion chamber 1101, and each set of exhaust holes includes a plurality of exhaust holes 1103 arranged at intervals along a circumferential direction of the inner wall 111.

The condensed water in the water storage cavity 1102 is heated by the high-temperature flue gas and then can be changed into steam, and the steam can be discharged from the plurality of exhaust holes 1103 respectively, so that the recycling effect of the steam can be improved, and the excessive collection of the condensed water in the water storage cavity 1102 can be well avoided.

Specifically, as shown in fig. 1 and fig. 2, the inner wall 111 is provided with two sets of exhaust holes spaced along the central axis of the combustion chamber 1101, each set of exhaust holes including a plurality of exhaust holes 1103 spaced along the circumferential direction of the inner wall 111.

In some embodiments, referring to fig. 1 and fig. 2, optionally, the water storage cavity 1102 coaxially surrounds the combustion chamber 1101, the high-temperature flue gas generated by the combustion of the burner 140 in the combustion chamber 1101 can uniformly heat the condensed water in the water storage cavity 1102, and the condensed water flowing into the water storage cavity 1102 can also uniformly cool the inner wall 111.

In some embodiments, optionally, referring to fig. 1, the condenser 130 is located outside the housing 110 and connected to the top end of the housing 110, so that the second air flow channel 1301 is communicated with the combustion chamber 1101. Because the first air flow channel 1201 is also communicated with the combustion chamber 1101, the first air flow channel 1201 is communicated with the second air flow channel 1301, when the gas water heating apparatus 10 is used, high-temperature flue gas flows into the first air flow channel 1201 and exchanges heat with water in the first liquid flow channel 1202 to obtain middle-temperature flue gas, the middle-temperature flue gas can flow out of the housing 110 from the first air flow channel 1201 and flow into the second air flow channel 1301, the middle-temperature flue gas can exchange heat with cold water flowing into the second liquid flow channel 1302 to achieve the effect of preheating the cold water, the preheated water flows into the first water inlet a of the first liquid flow channel 1202 through the second liquid flow channel 1302, and the preheated water can be heated by the high-temperature flue gas generated by the combustor 140, so that the heat conversion efficiency of the combustor 140 can be improved, and the gas can be saved.

In some embodiments, optionally, referring to fig. 1, the top end of the housing 110 is provided with a smoke collection cover 160 connected to the condenser 130 and communicated with the combustion chamber 1101, and the smoke passing through the heat exchanger 120 can flow into the condenser 130 through the smoke collection cover 160 and further flow into the second air flow channel 1301, so that the smoke exchanges heat with the cold water flowing into the second liquid flow channel 1302.

In some embodiments, optionally, referring to fig. 1, the smoke exhaust pipe 150 is disposed on a side of the condenser 130 away from the shell 110, and the smoke can be exhausted from the smoke exhaust pipe 150 after exchanging heat with the cold water flowing into the second liquid flow channel 1302.

In some embodiments, referring to fig. 1, the condensed water outlet 1303 is provided with a condensed connecting pipe 131 connected to the housing 110, so that the condensed water outlet 1303 is communicated with the water storage cavity 1102. In the process of heat exchange between the flue gas and the cold water flowing into the second flow channel 1302, when the temperature of the flue gas is cooled to the dew point temperature, water vapor in the flue gas begins to condense and separate out, and the separated condensed water can flow into the condensing connecting pipe 131 from the condensed water outlet 1303 and then flow into the water storage cavity 1102, so that heat exchange between the condensed water in the water storage cavity 1102 and the flue gas in the combustion chamber 1101 is realized.

In some embodiments, optionally, referring to fig. 1, the exhaust hole 1103 is located at the downstream side of the heat exchanger 120, and when the condensed water in the water storage chamber 1102 is heated by the high-temperature flue gas in the combustion chamber 1101 and turns into water vapor, the water vapor can be exhausted from the exhaust hole 1103 and can be exhausted to the smoke collecting hood 160 along with the flue gas passing through the heat exchanger 120.

In other embodiments, optionally, referring to fig. 2, the condenser 130 is disposed in the combustion chamber 1101 and located at the downstream side of the heat exchanger 120, so that the first air flow channel 1201 communicates with the second air flow channel 1301. It can be understood that the heat exchanger 120 and the condenser 130 are both disposed in the combustion chamber 1101, and the first air flow channel 1201 and the second air flow channel 1301 are both communicated with the combustion chamber 1101, so when the gas water heating apparatus 10 is used, high-temperature flue gas can flow into the first air flow channel 1201 and exchange heat with water in the first liquid flow channel 1202 to obtain middle-temperature flue gas, the middle-temperature flue gas can flow into the second air flow channel 1301 from the first air flow channel 1201, the middle-temperature flue gas can exchange heat with cold water flowing into the second liquid flow channel 1302 to achieve the effect of preheating cold water, the preheated water flows into the first water inlet a of the first liquid flow channel 1202 through the second liquid flow channel 1302, and this part of water can be heated by the high-temperature flue gas generated by the combustor 140, thereby improving the heat conversion efficiency of the combustor 140 and saving fuel gas. The middle-temperature flue gas exchanges heat with the cold water flowing into the second flow channel 1302, and then can flow out of the shell 110 to be discharged.

In other embodiments, referring to fig. 2, optionally, a smoke collecting hood 160 communicated with the combustion chamber 1101 is disposed at the top end of the housing 110, and the smoke collecting hood 160 is provided with a smoke exhaust pipe 150, so that the medium-temperature smoke can flow out of the housing 110 after exchanging heat with the cold water flowing into the second liquid flow passage 1302, and can be exhausted through the smoke collecting hood 160 and the smoke exhaust pipe 150, and the smoke can be collected by the smoke collecting hood 160 and exhausted into the smoke exhaust pipe 150.

In other embodiments, referring to fig. 2, the condensed water outlet 1303 is provided with a condensed extension pipe 132 extending into the water storage cavity 1102. Thus, in the process of heat exchange between the flue gas and the cold water flowing into the second flow channel 1302, when the temperature of the flue gas is cooled to the dew point temperature, the water vapor in the flue gas begins to condense and separate out, and the separated condensed water can flow into the condensation extension pipe 132 from the condensed water outlet 1303 and then flow into the water storage cavity 1102, so as to realize heat exchange between the condensed water in the water storage cavity 1102 and the flue gas in the combustion chamber 1101.

In some embodiments, optionally, referring to fig. 2, the exhaust hole 1103 is located at the downstream side of the condenser 130, and when the condensed water in the water storage chamber 1102 is heated by the flue gas with high temperature in the combustion chamber 1101 and turns into water vapor, the water vapor can be exhausted from the exhaust hole 1103 and can be exhausted to the smoke collecting hood 160 and the smoke exhaust pipe 150 together with the flue gas passing through the condenser 130.

In some embodiments, referring to fig. 1 and 2, optionally, the housing 110 is provided with a drain 1104 in communication with the water storage chamber 1102, and the drain 1104 is provided with a drain valve 1105. The user can open the blowdown valve 1105 as required to periodically clean the water storage chamber 1102, and can also open the blowdown valve 1105 as required to discharge the condensed water in the water storage chamber 1102.

In some embodiments, optionally, the gas-fired water heating apparatus 10 further comprises a controller, and the housing 110 is provided with a water level detector 170 electrically connected to the controller and used for acquiring a water level value of the water storage cavity 1102. The controller is configured to control the gas hot water apparatus 10 to stop operating when the water level value acquired by the water level detector 170 exceeds a preset water level value. When the condensed water in the water storage cavity 1102 is accumulated too much, the water level of the condensed water in the water storage cavity 1102 rises to the water level detector 170, so that the water level value obtained by the water level detector 170 exceeds the preset water level value, and the controller controls the gas water heating device 10 to stop working, so as to prevent the condensed water in the water storage cavity 1102 from overflowing.

In some embodiments, referring to fig. 1, when the gas water heating apparatus 10 is used, high-temperature flue gas flows into the first air flow channel 1201 and exchanges heat with water in the first liquid flow channel 1202 to obtain middle-temperature flue gas, the middle-temperature flue gas can flow out of the housing 110 from the first air flow channel 1201 and flow into the second air flow channel 1301 through the smoke collecting cover 160, the middle-temperature flue gas can exchange heat with cold water flowing into the second liquid flow channel 1302 to achieve an effect of preheating the cold water, and the preheated water flows into the first water inlet a of the first liquid flow channel 1202 through the second liquid flow channel 1302, which can be heated by the high-temperature flue gas generated by the burner 140, so as to improve the heat conversion efficiency of the burner 140 and save gas.

In the process of heat exchange between the flue gas and the cold water flowing into the second liquid flow channel 1302, when the temperature of the flue gas is cooled to the dew point temperature, the water vapor in the flue gas begins to condense and is separated out, the separated condensed water can flow into the condensing connecting pipe 131 from the condensed water outlet 1303 and then flows into the water storage cavity 1102, so that the flue gas in the combustion chamber 1101 heats the condensed water flowing into the water storage cavity 1102, the condensed water can be changed into the water vapor and is discharged from the plurality of exhaust holes 1103 on the downstream side of the heat exchanger 120, and thus, for the gas water heating device 10, a pipeline for discharging the condensed water does not need to be reserved, and the installation and the use of a user are greatly facilitated.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A gas-fired water heating apparatus, comprising:

a housing (110) having a combustion chamber (1101), and a water storage cavity (1102) surrounding the combustion chamber (1101) and spaced apart from the combustion chamber (1101); the water storage cavity (1102) is communicated with the external environment;

a heat exchanger (120) disposed within the combustion chamber (1101); the heat exchanger (120) is provided with a first air flow channel (1201) communicated with the combustion chamber (1101) and a first liquid flow channel (1202) used for exchanging heat with the first air flow channel (1201); and

a condenser (130) located in a flow path of the gas flow flowing out of the first gas flow channel (1201), wherein the condenser (130) is provided with a second gas flow channel (1301) communicated with the first gas flow channel (1201) and a second liquid flow channel (1302) used for exchanging heat with the second gas flow channel (1301); the second flow channel (1302) is communicated with the first water inlet (a) of the first flow channel (1202);

wherein, the condenser (130) is provided with a condensed water outlet (1303) communicated with the water storage cavity (1102).

2. The gas-fired water heating apparatus according to claim 1, wherein said housing (110) is provided with an exhaust vent (1103) communicating with said water storage chamber (1102) and with the external environment, respectively.

3. The gas-fired water heating apparatus according to claim 2, wherein the housing (110) comprises an inner wall (111) and an outer wall (112) surrounding the inner wall (111);

the combustion chamber (1101) is formed by enclosing the inner wall (111);

the water storage cavity (1102) is formed between the inner wall (111) and the outer wall (112).

4. The gas-fired water heating apparatus according to claim 3, wherein the exhaust hole (1103) is disposed on the inner wall (111), and one end of the exhaust hole (1103) is communicated with the water storage cavity (1102) and the other end is communicated with the combustion chamber (1101).

5. The gas-fired water heating apparatus according to claim 1, wherein the condenser (130) is located outside the housing (110) and connected to a top end of the housing (110) to communicate the second gas flow channel (1301) with the combustion chamber (1101).

6. The gas-fired water heating apparatus according to claim 5, wherein the condensed water outlet (1303) is provided with a condensed connection pipe (131) connected to the case (110) so that the condensed water outlet (1303) communicates with the water storage chamber (1102).

7. The gas-fired water heating apparatus according to claim 1, wherein the condenser (130) is disposed in the combustion chamber (1101) at a downstream side of the heat exchanger (120) to communicate the first air flow passage (1201) with the second air flow passage (1301).

8. The gas-fired water heating apparatus according to claim 7, wherein the condensed water outlet (1303) is provided with a condensing extension pipe (132) extending into the water storage chamber (1102).

9. The gas-fired water heating apparatus according to claim 1, wherein the housing (110) is provided with a drain pipe (1104) communicated with the water storage chamber (1102), and a drain valve (1105) is provided on the drain pipe (1104).

10. The gas-fired water heating apparatus according to claim 1, wherein the gas-fired water heating apparatus (10) further comprises a controller;

the shell (110) is provided with a water level detector (170) which is electrically connected with the controller and used for acquiring the water level value of the water storage cavity (1102).

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