Air supply device and gas water heater

Abstract

An air supply device and a gas water heater. The air supply device (10) comprises a first housing (11) and a second housing (12), wherein the first housing (11) is provided with an air intake duct (101), and a volute air duct (102) in communication with the air intake duct (101) and an air output duct (103) in communication with the volute air duct (102) are constructed between the first housing (11) and the second housing (12), and in the radially outward direction of the volute air duct (102), the air output duct (103) is inclined in a direction facing away from the air intake duct (101). By means of inclining the air output duct, the circulation of an airflow can be facilitated, thereby reducing the flow resistance during an airflow circulation process.

Description

Air supply device and gas water heater

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese Patent Application No. 202420857515.2, filed with the Chinese Patent Office on April 23, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of water heater technology, and in particular to an air supply device and a gas water heater. Background Technology

[0004] Gas water heaters are usually equipped with a fan to exhaust the waste gas and residual heat generated during the use of the water heater, thereby reducing the impact of waste gas and residual heat on the normal operation of the water heater.

[0005] In gas water heaters with related technologies, air is delivered by matching the shell with the fan. When the water heater is in actual operation, a large amount of waste heat is generated. In order to meet the needs of the water heater, the shell is usually made of metal, and its processing steps are relatively complicated. Summary of the Invention

[0006] One object of this application is to provide an air supply device to solve one or more technical problems existing in the prior art, or at least provide a beneficial option or create conditions.

[0007] Another objective of this application is to provide a gas water heater.

[0008] According to an embodiment of this application, the air supply device includes a first housing and a second housing. The first housing has an air inlet duct. A volute duct communicating with the air inlet duct and an air outlet duct communicating with the volute duct are constructed between the first housing and the second housing. In a radially outward direction along the volute duct, the air outlet duct is inclined in a direction away from the air inlet duct.

[0009] According to the embodiments of this application, the air supply device can be constructed by connecting the first housing and the second housing, which can simplify the structure of the air supply device and reduce the processing cost.

[0010] In addition, the air supply device according to the above embodiments of this application may also have the following additional technical features:

[0011] In some embodiments, the first housing is configured as a single piece; and / or, the second housing is configured as a single piece.

[0012] In some embodiments, the first housing is configured as a plastic housing; or, the second housing is configured as a plastic housing; or, the first housing is configured as a BMC housing; or, the second housing is configured as a BMC housing.

[0013] In some embodiments, the first housing includes a first side plate and a first end plate connected to one side edge of the first side plate, and the second housing includes a second side plate and a second end plate connected to one side edge of the second side plate. The other side edge of the first side plate and the other side edge of the second side plate are connected to form the volute air duct.

[0014] In some embodiments, the first end plate is provided with an air inlet, and the first housing further includes a third side plate, the third side plate having an air inlet duct formed therein, the third side plate being connected to the first end plate, and the air inlet duct being connected to the air inlet.

[0015] In some embodiments, the first housing further includes a fourth side plate, and the second housing further includes a fifth side plate, wherein the fourth side plate and the fifth side plate are connected and enclose each other to form the air outlet duct.

[0016] In some embodiments, the first end plate is provided with an air inlet, and the periphery of the air inlet is provided with a flange, the flange being configured to extend obliquely from the air inlet duct toward the volute duct.

[0017] In some embodiments, the first housing has a first side edge, the second housing has a second side edge, the first side edge has a first recess and a first convex portion, the first convex portion protruding relative to the first recess, the second side edge has a second recess and a second convex portion, the second convex portion protruding relative to the second recess, the first convex portion being disposed in the second recess, and the second convex portion being disposed in the first recess.

[0018] In some embodiments, the first housing and the second housing have a first dividing surface and a second dividing surface, the first dividing surface being disposed on a plane passing through the axis of the air outlet duct; the second dividing surface being connected to the first dividing surface and disposed on the normal plane of the axis of the volute duct.

[0019] In some embodiments, the air supply device has mutually orthogonal front-back direction, up-down direction and left-right direction, and the axis of the volute air duct is configured to be inclined from the lower left to the upper right.

[0020] In some embodiments, the top wall of the air inlet duct is configured to extend obliquely from the lower left to the upper right to the left side wall of the volute duct.

[0021] In some embodiments, the inlet axis of the air inlet duct is parallel to the vertical direction, and the outlet axis of the air outlet duct is parallel to the vertical direction.

[0022] In some embodiments, the air outlet duct has a transition section and an air outlet section, the air outlet section being inclined radially away from the air inlet duct relative to the volute duct, a first end of the transition section being connected to the volute duct, and a second end being connected to the air outlet section.

[0023] A gas water heater according to an embodiment of this application includes: the aforementioned air supply device; a combustion chamber, wherein the combustion chamber is connected to the air supply device and communicates with the air inlet duct.

[0024] In some embodiments, the air intake duct is located above the combustion chamber. Attached Figure Description

[0025] Figure 1 is a schematic diagram of an air supply device according to an embodiment of this application.

[0026] Figure 2 is a top view of an air supply device according to an embodiment of this application.

[0027] Figure 3 is a cross-sectional view of an air supply device according to an embodiment of this application.

[0028] Figure 4 is a magnified view of a portion of area A circled in Figure 3.

[0029] Figure 5 is a schematic diagram of the first housing of an air supply device according to an embodiment of this application.

[0030] Figure 6 is a magnified view of a portion of the area circled in Figure 5.

[0031] Figure 7 is a schematic diagram of the second housing of an air supply device according to an embodiment of this application.

[0032] Figure 8 is a magnified view of a portion of the circled area C in Figure 7.

[0033] Reference numerals: 10, air supply device; 101, air inlet duct; 102, volute duct; 1021, air inlet; 1022, air outlet; 103, air outlet duct; 1031, transition section; 1032, air outlet section; 1041, first dividing surface; 1042, second dividing surface; 11, first outer shell; 111, first end plate; 113, first side plate; 114, third side plate; 115, fourth side plate; 1102, flange; 1105, first side edge; 1106, first recess; 1107, first protrusion; 12, second outer shell; 122, second end plate; 123, second side plate; 124, fifth side plate; 1204, mounting base; 1205, second side edge; 1206, second recess; 1207, second protrusion. Detailed Implementation

[0034] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0035] As shown in Figures 1 to 4, the air supply device 10 according to an embodiment of this application includes a first outer shell 11 and a second outer shell 12. The first outer shell 11 has an air inlet duct 101, and a volute duct 102 communicating with the air inlet duct 101 is constructed between the first outer shell 11 and the second outer shell 12. An air outlet duct 103 communicating with the volute duct 102 is also constructed between the first outer shell 11 and the second outer shell 12. In the radially outward direction along the volute duct 102, the air outlet duct 103 is inclined in a direction away from the air inlet duct 101.

[0036] Airflow can enter the volute duct 102 through the inlet duct 101, and after passing through the volute duct 102, it is delivered out through the outlet duct 103. Optionally, the volute duct 102 has an inlet 1021 on one side wall along the axial direction and an outlet 1022 on its peripheral wall. The inlet duct 101 is connected to the inlet 1021, and the outlet duct 103 is connected to the outlet 1022. The outlet duct 103 is inclined in the direction away from the side wall relative to the radial direction of the volute duct 102. The air supply device 10 may also include an impeller and a motor, etc. The impeller can be located in the volute duct 102 to provide power for the airflow.

[0037] According to the embodiments of this application, the air supply device 10 can be constructed by connecting the first outer shell 11 and the second outer shell 12, which simplifies the structure of the air supply device 10 and reduces the processing cost. In addition, when the airflow enters the volute duct 102 through the air inlet duct 101, it will have a velocity along the axial direction of the volute duct 102. After being driven by the impeller inside the volute duct 102, it will be sent out from the air outlet 1022 along the radial direction of the volute duct 102. The airflow may have a certain axial velocity component. By tilting the air outlet duct 103, the airflow can be facilitated and the flow resistance during the airflow process can be reduced.

[0038] The air supply device 10 has mutually orthogonal front-back direction, left-right direction and up-down direction. Of course, the orientation is mainly described according to the accompanying drawings in this application. This is not a limitation on the scope of protection of this application. The technical solution obtained by adjusting the direction according to the scheme of this application is still within the scope of protection of this application, such as swapping the left and right directions in the accompanying drawings.

[0039] In addition, this configuration allows for air intake and exhaust in the vertical direction. Furthermore, due to the inclined axis of the volute duct 102, the volume of the air supply device 10 can be reduced. Some embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0040] As shown in Figures 2 and 3, the axis of the volute duct 102 is inclined from the lower left to the upper right. Due to the inclined arrangement of the volute duct 102, after the airflow enters the air supply device 10 from the bottom up, it will enter the volute duct 102 along the air inlet duct 101. Compared with the volute whose axis extends in the left and right direction, the inclined arrangement of the axis of the volute duct 102 can reduce the wind resistance during the airflow process and effectively improve the energy efficiency of the air supply device 10.

[0041] The top wall of the air inlet duct 101 is configured to extend obliquely from the lower left to the upper right into the volute duct 102. For example, the air inlet 1021 is located on the left side wall of the volute duct 102, and the top wall of the air inlet duct 101 extends obliquely from the lower left to the upper right into the left side wall of the volute duct 102. This facilitates the guidance of airflow into the volute duct 102. Specifically, after the airflow enters the air inlet duct 101, it is guided by the top wall of the air inlet duct 101, and the flow direction gradually changes from bottom to top to bottom to upper right, thus facilitating a stable airflow into the volute duct 102 and effectively improving the performance of the air supply device 10.

[0042] Furthermore, in some specific examples of this application, the axis of the volute duct 102 is configured to slope from the lower left to the upper right, the inlet axis of the inlet duct 101 is parallel to the vertical direction, and the outlet axis of the outlet duct 103 is parallel to the vertical direction. Airflow can enter the inlet duct 101 from the bottom up; under the guiding or converging effect of the inlet duct 101, it enters the volute duct 102 through the inlet 1021; subsequently, it enters the outlet duct 103 through the outlet 1022 of the volute duct 102, and finally exits from the outlet of the outlet duct 103. The entire process is smooth, with low wind resistance, effectively improving the energy efficiency of the air supply device 10.

[0043] In some embodiments of this application, as shown in Figure 3, the air outlet duct 103 has a transition section 1031 and an air outlet section 1032. The air outlet section 1032 is inclined radially away from the sidewall relative to the volute duct 102. The first end of the transition section 1031 is connected to the volute duct 102 and communicates with the air outlet 1022, and the second end is connected to the air outlet section 1032. The transition section 1031 can be used to guide the airflow, further reducing flow resistance and improving energy efficiency. The transition section 1031 can be configured as an arc-shaped duct or a straight duct, etc. The axis of the first end of the transition section 1031 can be configured to be parallel to or coincide with the axis of the air outlet 1022, and the axis of the second end of the transition section 1031 can be configured to be parallel to or coincide with the inlet axis of the air outlet section 1032.

[0044] For example, as shown in Figure 3, the air outlet duct 103 has a transition section 1031 and an air outlet section 1032. The air outlet section 1032 extends in the vertical direction. The first end of the transition section 1031 connects to the volute duct 102 and communicates with the air outlet 1022, and the second end connects to the air outlet section 1032. The axis of the first end is approximately parallel to the axis of the air outlet 1022, and the axis of the second end is approximately parallel to the vertical direction. By setting the transition section 1031, the radial airflow of the volute duct 102 can be stably guided to a direction inclined to the radial direction of the volute duct 102, thereby facilitating the smooth flow of air from the volute duct 102 into the air outlet duct, reducing wind resistance during airflow, and optimizing the performance of the air supply device 10.

[0045] In conjunction with the foregoing, the connection of the first outer shell 11 and the second outer shell 12 forms the air inlet duct 101 and the volute duct 102, which facilitates the molding of the first outer shell 11 and the second outer shell 12. Optionally, the first outer shell 11 may include a first air duct shell and a second air duct shell, and the second outer shell 12 may include a third air duct shell, wherein the first air duct shell and the second air duct shell are connected. The first air duct shell is constructed as a first air duct body, and the air inlet duct 101 is constructed within the first air duct body; the second air duct shell and the third air duct shell are connected, and the second air duct shell and the third air duct shell are constructed as a second air duct body, and the volute duct 102 is constructed within the second air duct body, wherein the second air duct shell and the second air duct shell are each half of the second air duct body.

[0046] In some embodiments of this application, the first outer shell 11 is configured as a single piece. Single-piece molding improves the processing efficiency and reduces the processing cost of the first outer shell 11, while also ensuring higher structural strength and sealing performance, thereby improving the service life and energy efficiency of the air supply device 10. Alternatively, the second outer shell 12 can also be configured as a single piece. When both the first and second outer shells 11 and 12 are single-piece structures, the service life and energy efficiency of the air supply device 10 can be further improved, and problems such as stress concentration at the connection between the first and second outer shells 11 and 12 due to thermal expansion and contraction can be avoided.

[0047] At least one of the first outer shell 11 and the second outer shell 12 in this application can be made of plastic, which can further improve the processing efficiency of the air supply device 10 and reduce the cost of the air supply device 10. In addition, in conjunction with the foregoing, the air duct structure is constructed by connecting the first outer shell 11 and the second outer shell 12 in the front-back direction in this application, which can simplify the structure of the first outer shell 11 and the second outer shell 12, making the first outer shell 11 and the second outer shell 12 easy to mold into plastic, thereby effectively reducing the cost of the air supply device 10 and improving the molding efficiency of the air supply device 10.

[0048] In this application, the first and second housings can be made of high-temperature resistant materials and can be installed in the special environment of a water heater. For example, the first housing 11 and the second housing 12 can be formed by injection molding and die casting respectively. After forming, the first housing 11 and the second housing 12 are connected together, that is, the original multiple sheet metal parts are simplified into two parts to form the housing, which simplifies the process and reduces the processing cost.

[0049] Furthermore, at least one of the first outer shell 11 and the second outer shell 12 in this application can be configured as a BMC shell. BMC is essentially a molding intermediate material for semi-dry manufacturing of glass fiber reinforced thermosetting articles. It can be molded and injection molded, and its heat resistance is better than that of general engineering plastics. Its heat distortion temperature (HDT) is between 100°C and 100°F. Therefore, when a shell made of BMC material is installed in a water heater, it will not overheat and melt.

[0050] In addition, at least one of the first outer shell 11 and the second outer shell 12 may be made of metal.

[0051] In this application, the first outer shell 11 and the second outer shell 12 may be constructed in the form of a volute air duct 102, including but not limited to the following implementations.

[0052] In some embodiments, as shown in Figures 5 and 7, the first housing 11 includes a first side plate 113 and a first end plate 111. The first side plate 113 may be configured as a cylinder, and the first end plate 111 is connected to one side edge of the first side plate 113. The second housing 12 may include a second side plate 123 and a second end plate 122. The second side plate 123 may be configured as a cylinder, and the second end plate 122 is connected to one side edge of the second side plate 123. The other side edge of the first side plate 113 and the other side edge of the second side plate 123 are connected to form a volute air duct 102.

[0053] This application primarily uses the first outer shell 11, including a first side plate 113 and a first end plate 111, and the second outer shell 12, including a second side plate 123 and a second end plate 122, as examples for illustration. However, this is not a limitation on the scope of protection of this application. Other forms can also be used in this application, such as omitting the first side plate 113 or the second side plate 123. Of course, the above-described methods of constructing the volute air duct 102 are merely some implementations of this application and are not a limitation on the scope of protection of this application.

[0054] In addition, the first end plate 111 may be provided with an air inlet 1021, and the first outer shell 11 also includes a third side plate 114. An air inlet duct 101 is formed on the inner side of the third side plate 114. The third side plate 114 may be connected to the first end plate 111, and the air inlet duct 101 is connected to the air inlet 1021. The third side plate 114 may be cylindrical, square, triangular, or other cylindrical shapes.

[0055] For example, the third side panel 114 may include a first panel portion, a second panel portion, a third panel portion, and a fourth main portion, which are sequentially connected to form a square frame shape. The first panel portion may extend in the vertical direction; the second panel portion may extend in the front-back direction; the third panel portion may extend in the vertical direction; and the fourth panel portion may extend in the front-back direction. Of course, the above description is only some embodiments of this application and is not intended to limit the scope of protection of this application. The air inlet duct 101 in this application may also be a circular frame, a conical frame, or other shapes.

[0056] During the assembly of the air supply device 10, the impeller can be installed inside the volute duct 102. The volute duct 102 is formed by splicing the first outer shell 11 and the second outer shell 12, which facilitates the installation of the impeller. Moreover, the impeller can be supported by the cooperation of the first end plate 111 and the second end plate 122. This arrangement can improve the installation efficiency of the impeller.

[0057] Furthermore, as shown in Figures 5 and 7, the first outer shell 11 also includes a fourth side plate 115, and the second outer shell 12 also includes a fifth side plate 124. The fourth side plate 115 and the fifth side plate 124 are connected and enclose to form an air outlet duct 103. This simplifies the structure of the first outer shell 11 and the second outer shell 12. When the first outer shell 11 and the second outer shell 12 are injection molded, the air outlet duct 103 is split into the fourth side plate 115 and the fifth side plate 124, which facilitates the molding of the first outer shell 11 and the second outer shell 12, reduces manufacturing costs, and improves production efficiency.

[0058] In addition, the second end plate 122 may be provided with a shaft hole, which can facilitate the installation of the impeller shaft and the motor connected to the outside of the volute duct 102, so as to facilitate the driving of airflow. Furthermore, the outer side of the second end plate 122 may be provided with a mounting base 1204, which can facilitate the installation of the motor.

[0059] The first end plate 111 is provided with an air inlet 1021, and the air inlet 1021 is provided with a flange 1102 around its periphery. The flange 1102 is configured to extend obliquely from the air inlet duct 101 toward the volute duct 102, which facilitates the connection between the air inlet duct 101 and the volute duct 102, and connects the volute duct 102 with the air inlet duct 101 through this inlet, facilitating smoke exhaust. In addition, the flange 1102 can form a flow guiding structure to guide the smoke, further reduce the wind resistance at the air inlet 1021, and further concentrate the smoke, facilitating smoke exhaust. The flange 1102 forms a ring extending along the periphery of the air inlet 1021.

[0060] In some embodiments of this application, the inlet of the air inlet duct 101 extends vertically, and the outlet of the volute duct 102 extends vertically. Driven by the impeller inside the volute, a negative pressure is generated within the volute duct 102. The flue gas passes vertically through the air inlet duct 101, then through the air inlet 1021 between the air inlet duct 101 and the volute duct 102, and is then pushed horizontally into the volute duct 102. Driven by the impeller inside the volute duct 102, the flue gas is then expelled vertically. Therefore, by setting the directions of the inlet and outlet, flue gas flow is facilitated, flow resistance during flue gas flow is reduced, and the performance of the air supply device 10 is optimized.

[0061] Referring to Figures 5 to 8, the first outer shell 11 has a first side 1105, and the second outer shell 12 has a second side 1205. The first side 1105 and the second side 1205 are connected. The first side 1105 may include a first front side and a first rear side, and the second side may include a second front side and a second rear side. Specifically, the first outer shell 11 and the second outer shell 12 are connected in the left-right direction. The first shell 11 has a first front side and a first rear side, and the second shell 12 has a second front side and a second rear side. One end of the first front side and one end of the first rear side are separated at the outlet of the air duct, and the other end of the first front side and the other end of the first rear side are connected. One end of the second front side and one end of the second rear side are separated at the outlet of the air duct, and the other end of the second front side and the other end of the second front side are connected. The first front side and the second front side are connected, and the first rear side and the second rear side are connected, thereby constructing an airflow channel between the first outer shell 11 and the second outer shell 12.

[0062] The first side 1105 has a first recess 1106 and a first protrusion 1107, with the first protrusion 1107 protruding beyond the first recess 1106. The second side 1205 has a second recess 1206 and a second protrusion 1207, with the second protrusion 1207 protruding beyond the second recess 1206. The first protrusion 1107 is located within the second recess 1206, and the second protrusion 1207 is located within the first recess 1106. The air supply device 10 itself has a guiding effect, therefore requiring a certain level of sealing. The cooperation between the first protrusion 1107 and the second recess 1206, as well as the cooperation between the second protrusion 1207 and the first recess 1106, can improve the sealing performance of the connection structure between the first outer shell 11 and the second outer shell 12, making the connection structure between the first outer shell 11 and the second outer shell 12 more stable and stronger. Furthermore, the concave-convex structure cooperation can provide a certain guiding effect, thereby facilitating the connection between the first outer shell 11 and the second outer shell 12.

[0063] In some embodiments, a first dividing surface 1041 and a second dividing surface 1042 are provided between the first outer shell 11 and the second outer shell 12. The first dividing surface 1041 is disposed on a plane passing through the axis of the air outlet duct 103; the second dividing surface 1042 is connected to the first dividing surface 1041 and is disposed on the normal plane of the axis of the volute duct 102. This simplifies the structure of the first outer shell 11 and the second outer shell 12, reduces the mold cost for manufacturing the first outer shell 11 and the second outer shell 12, facilitates demolding, facilitates the molding of the first outer shell 11 and the second outer shell 12, and improves the molding efficiency of the first outer shell 11 and the second outer shell 12.

[0064] In addition, a connector is provided between the first outer shell 11 and the second outer shell 12. Specifically, the connector can be a bolt, or in other embodiments, it can be a wire for connection. The addition of a connector to the first outer shell 11 and the second outer shell 12 makes the connection between the first outer shell 11 and the second outer shell 12 more stable, enhances the connection stability between the first outer shell 11 and the second outer shell 12, and thus improves the sealing effect of the connection between the first outer shell 11 and the second outer shell 12.

[0065] Furthermore, the first housing 11 is connected to a first extension plate, which is located on the outer side wall of the first housing 11. The second housing 12 is connected to a second extension plate, which is located on the outer side wall of the second housing 12. A connector is connected to the first extension plate and the second extension plate. In some embodiments, the first extension plate and the second extension plate have the same shape and structure, and when the first housing 11 and the second housing 12 are snapped together, the first extension plate and the second extension plate are completely abutted. The first extension plate and the second extension plate provide a connection position for the connector, facilitating the insertion of the connector into the first extension plate and the second extension plate.

[0066] In some embodiments, after the connector passes through the first extension plate and the second extension plate, one end of the connector abuts against the outer side wall of the second extension plate, the other end of the connector extends out of the outer side wall of the first extension plate, and the other end of the connector is connected to a locking rod via a pivot, and the diameter of the locking rod is smaller than the diameter of the connector.

[0067] A torsion spring is also provided, which is sleeved on the rotating shaft. The two ends of the torsion spring are connected to the locking rod and the connecting piece, respectively. Under the action of the torsion spring, the angle formed between the screw and the locking rod can be limited, so that the locking rod tends to move towards the first extension plate, and the end of the locking rod away from the rotating shaft abuts against the outer wall of the first extension plate.

[0068] Before the connector passes through the first extension plate and the second extension plate, first rotate the locking rod to overcome the spring force of the torsion spring, so that the locking rod and the connector are coaxially arranged. Then, the locking rod and the connector are simultaneously passed through the first extension plate and the second extension plate. Then, the locking rod is released. Under the action of the torsion spring, the locking rod will form a certain angle with the connector, reducing the possibility of the connector accidentally coming out of the first extension plate and the second extension plate, thereby improving the connection stability between the first housing 11 and the second housing 12.

[0069] In some embodiments, the first housing 11 and the second housing 12 are connected by adhesive. The first housing 11 and the second housing 12 can be connected by adhesive, a connection method that is relatively simple and easy to operate.

[0070] The gas water heater according to an embodiment of this application includes: the aforementioned air supply device 10 and a combustion chamber. The combustion chamber is connected to the air supply device 10 and communicates with the air inlet duct 101. A burner can be installed in the combustion chamber. During combustion, the burner produces exhaust gas. Under the suction of the air supply device 10, the exhaust gas is collected through the air inlet duct 101 and discharged from the outlet of the air supply device 10. The air supply device 10 in this application has low wind resistance and is easy to form, thus improving the production efficiency of the air supply device 10 while ensuring the flow of exhaust gas.

[0071] In some embodiments, the combustion chamber and the air supply device 10 are distributed along a left-right direction, which is parallel to the axis of the volute air duct 102. This can reduce flue gas resistance and improve exhaust performance, thereby providing a better combustion environment for the combustion chamber, achieving complete combustion of the fuel gas, and saving energy and protecting the environment. For example, the air inlet duct 101 can be located above the combustion chamber.

[0072] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0073] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0074] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0075] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0076] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0077] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. An air supply device, wherein, The air supply device includes a first housing and a second housing. The first housing has an air inlet duct. A volute duct communicating with the air inlet duct and an air outlet duct communicating with the volute duct are constructed between the first housing and the second housing. In the radially outward direction along the volute duct, the air outlet duct is inclined in a direction away from the air inlet duct.

2. The air supply device according to claim 1, wherein, The first housing is configured as a single piece; and / or the second housing is configured as a single piece.

3. The air supply device according to claim 2, wherein, The first outer shell is configured as a plastic shell; or, the second outer shell is configured as a plastic shell; or, the first outer shell is configured as a BMC shell; or, the second outer shell is configured as a BMC shell.

4. The air supply device according to any one of claims 1-3, wherein, The first housing includes a first side plate and a first end plate connected to one side edge of the first side plate. The second housing includes a second side plate and a second end plate connected to one side edge of the second side plate. The other side edge of the first side plate and the other side edge of the second side plate are connected to form the volute air duct.

5. The air supply device according to claim 4, wherein, The first end plate is provided with an air inlet, and the first housing also includes a third side plate. The air inlet duct is constructed inside the third side plate. The third side plate is connected to the first end plate, and the air inlet duct is connected to the air inlet.

6. The air supply device according to any one of claims 4-5, wherein, The first housing also includes a fourth side plate, and the second housing also includes a fifth side plate. The fourth side plate and the fifth side plate are connected and enclose each other to form the air outlet duct.

7. The air supply device according to any one of claims 4-6, wherein, The first end plate is provided with an air inlet, and the periphery of the air inlet is provided with a flange, which is configured to extend obliquely from the air inlet duct toward the volute duct.

8. The air supply device according to any one of claims 1-7, wherein, The first housing has a first side, and the second housing has a second side. The first side has a first recess and a first convex portion, with the first convex portion protruding beyond the first recess. The second side has a second recess and a second convex portion, with the second convex portion protruding beyond the second recess. The first convex portion is disposed in the second recess, and the second convex portion is disposed in the first recess.

9. The air supply device according to any one of claims 1-8, wherein, The first outer shell and the second outer shell have a first dividing surface and a second dividing surface. The first dividing surface is located on a plane passing through the axis of the air outlet duct. The second dividing surface is connected to the first dividing surface and is located on the normal plane of the axis of the volute duct.

10. The air supply device according to any one of claims 1-9, wherein, The air supply device has mutually orthogonal front-back direction, up-down direction and left-right direction, and the axis of the volute air duct is configured to be inclined from the lower left to the upper right direction.

11. The air supply device according to claim 10, wherein, The top wall of the air inlet duct is configured to extend at an angle from the lower left to the upper right into the volute duct.

12. The air supply device according to any one of claims 10-11, wherein, The inlet axis of the air inlet duct is parallel to the vertical direction, and the outlet axis of the air outlet duct is parallel to the vertical direction.

13. The air supply device according to any one of claims 1-12, wherein, The air outlet duct has a transition section and an air outlet section. The air outlet section is inclined in the direction away from the air inlet duct relative to the radial direction of the volute duct. The first end of the transition section is connected to the volute duct, and the second end is connected to the air outlet section.

14. A gas-fired water heater, wherein, include: The air supply device according to any one of claims 1-13; The combustion chamber is connected to the air supply device and communicates with the air intake duct.

15. The gas water heater according to claim 14, wherein, The air intake duct is located above the combustion chamber.

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