Fan assembly and gas water heater

Abstract

The utility model discloses a draught fan assembly and a gas water heater, the draught fan assembly comprises a draught fan shell, the draught fan shell is provided with a volute air duct, and the volute air duct is provided with a volute inlet and a volute outlet; the impeller device is rotatably arranged in the volute air duct; the motor device is in transmission connection with the impeller device and is used for driving the impeller device to rotate; and the anti-freezing device comprises an air pipe and blades, the air pipe is connected with the fan shell and communicates with the volute outlet, and the blades are connected with the air pipe and are configured to be opened in one direction in the air outlet direction of the volute air duct. According to the fan assembly provided by the embodiment of the utility model, the anti-freezing device is arranged, so that the anti-freezing of the fan assembly and the gas water heater with the fan assembly is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of water heaters, and particularly relates to a fan assembly and a gas water heater. Background Art

[0002] A fan is usually installed in a gas water heater. The fan is used to discharge the waste gas and waste heat generated during the use of the water heater, so as to reduce the impact of the waste gas and waste heat on the normal operation of the water heater. In the gas water heaters of related technologies, outdoor air flow is likely to flow back, affecting the operation stability of the gas water heater. Especially in cold winters, the cold air flowing back easily causes the gas water heater to freeze and fail to start. Summary of the Utility Model

[0003] An object of the utility model is to provide a fan assembly and a gas water heater.

[0004] The fan assembly according to an embodiment of the utility model includes: a fan housing provided with a volute air duct having a volute inlet and a volute outlet; an impeller device rotatably arranged in the volute air duct; a motor device drivingly connected to the impeller device for driving the impeller device to rotate; an anti-freezing device including an air duct and blades, the air duct being connected to the fan housing and communicating with the volute outlet, and the blades being connected to the air duct and configured to open unidirectionally along the air outlet direction of the volute air duct.

[0005] For the fan assembly according to an embodiment of the utility model, an anti-freezing device is provided, and the anti-freezing device is connected to the volute air duct through the air duct. During use, under the suction action of the fan assembly, flue gas and the like can enter the air duct and open the blades to discharge the flue gas. When external air flows back along the air duct, the blades will block the air flow back, so as to avoid the backflow of discharged flue gas and the like to the fan assembly. In addition, when the outdoor temperature is relatively low, the anti-freezing device can be used to prevent the cold air in the external environment from flowing back to the fan assembly, thereby realizing the anti-freezing of the fan assembly and the gas water heater having the fan assembly.

[0006] In addition, the fan assembly according to the above embodiment of the utility model may further have the following additional technical features:

[0007] In some embodiments, the air duct is sleeved and fitted on the inner side of the peripheral wall of the volute outlet; or, the air duct is sleeved and fitted on the outer side of the peripheral wall of the volute outlet.

[0008] In some embodiments, the blower housing includes a first housing and a second housing, the first housing and the second housing are connected along the axial direction of the impeller device, the first housing includes a first sub-housing and a third sub-housing, the second housing includes a second sub-housing and a fourth sub-housing, the volute air duct is disposed between the first sub-housing and the second sub-housing, and the volute outlet is disposed between the third sub-housing and the fourth sub-housing;

[0009] Alternatively, the blower housing includes a third housing and a fourth housing, the third housing and the fourth housing are connected along a predetermined direction, the third housing includes a fifth sub-housing and a seventh sub-housing, the fourth housing includes a sixth sub-housing and an eighth sub-housing, the volute air duct is disposed between the fifth sub-housing and the sixth sub-housing, the volute outlet is disposed between the seventh sub-housing and the eighth sub-housing, and the predetermined direction is perpendicular to the axial direction of the volute outlet and the axial direction of the impeller device;

[0010] Alternatively, the blower housing includes a fifth housing and a sixth housing, the fifth housing and the sixth housing are connected along the axial direction of the volute outlet, the fifth housing includes a ninth sub-housing and a tenth sub-housing, the volute air duct is disposed between the ninth sub-housing and the sixth housing, and the tenth sub-housing surrounds the volute outlet.

[0011] In some embodiments, the first housing is integrally formed and / or the second housing is integrally formed; or, the third housing is integrally formed and / or the fourth housing is integrally formed; or, the fifth housing is integrally formed and / or the sixth housing is integrally formed.

[0012] In some embodiments, the air duct includes a first half-duct and a second half-duct, and the first half-duct and the second half-duct enclose to form the air duct.

[0013] In some embodiments, the blower housing is configured as a high-temperature resistant housing.

[0014] In some embodiments, the blower housing is configured as a plastic housing or a resin housing.

[0015] In some embodiments, the blower housing is configured as a BMC housing.

[0016] In some embodiments, the peripheral wall of the volute outlet has a first section and a second section distributed along the axis, the radial dimension of the outer peripheral surface of the first section is smaller than the radial dimension of the outer peripheral surface of the second section, and one end of the air duct is sleeved outside the first section and is opposite to the second section along the axial direction of the volute outlet;

[0017] Alternatively, the circumferential wall of the volute outlet has a third section and a fourth section distributed along the axis. The radial dimension of the inner circumferential surface of the third section is greater than that of the inner circumferential surface of the fourth section. One end of the air duct is sleeved on the third section and is opposite to the fourth section along the axis direction of the volute outlet.

[0018] In some embodiments, the blade is rotatably connected to the air duct. When the internal air pressure in the volute air duct is higher than a predetermined value of the external air pressure of the fan assembly, the blade is in the first position and opens the air duct; when the air pressure in the volute air duct is not higher than the external air pressure of the fan assembly, the blade is in the second position and closes the air duct.

[0019] In some embodiments, the anti-freezing device further includes:

[0020] A seat body, the seat body is connected to the air duct, and the seat body is provided with an air outlet;

[0021] A rotating shaft, the rotating shaft is connected to the seat body, the blade is connected to the rotating shaft and is rotatable around the rotating shaft. The blade opens the air outlet in the first position and closes the air outlet in the second position.

[0022] In some embodiments, the seat body includes an annular rib and a strip-shaped rib. The annular rib is arranged inside the air duct and along the circumferential wall of the air duct. Two ends of the strip-shaped rib are respectively connected to opposite sides of the annular rib. The strip-shaped rib divides a first air outlet and a second air outlet inside the annular rib. The blade includes a first sub-blade and a second sub-blade. The first sub-blade is connected to the rotating shaft and is rotatable to open and close the first air outlet. The second sub-blade is connected to the rotating shaft and is rotatable to open and close the second air outlet.

[0023] In some embodiments, the rotating shaft and the strip-shaped rib are opposite to each other along the axis of the air duct; and / or, a relief groove is provided on the outer circumferential surface of the annular rib. The end of the rotating shaft passes through the annular rib and is located in the relief groove; and / or, a first flanging portion is provided on the outer circumference of the annular rib, and the first flanging portion is sleeved on the inner side surface of the air duct; and / or, a second flanging is provided on the inner circumferences of the first air outlet and the second air outlet, and the blade is supported on the second flanging in the second position; and / or, the seat body further includes a retaining rib, and the retaining rib is configured to limit the rotation angles of the first sub-blade and the second sub-blade.

[0024] In some embodiments, the air duct extends in the up and down direction and the lower end is connected to the fan housing. When the air pressure in the volute air duct is not higher than the external air pressure of the fan assembly, the blade is supported on the seat body.

[0025] In some embodiments, the fan assembly is further provided with an air inlet duct, and the air inlet duct is communicated with the volute duct.

[0026] In some embodiments, the fan housing includes a first housing and a second housing. The first housing and the second housing are connected along the axial direction of the impeller device and construct the volute duct. The air inlet duct is arranged in the first housing.

[0027] Alternatively, the fan housing includes a third housing and a fourth housing. The third housing and the fourth housing are connected along the radial direction of the impeller device and construct the volute duct and the air inlet duct.

[0028] A gas water heater according to an embodiment of the present invention includes:

[0029] The fan assembly according to any one of the claims;

[0030] A combustion chamber, which is connected to the fan assembly and communicated with the inlet of the volute duct.

[0031] In some embodiments, the fan housing includes a smoke collecting hood. An air inlet duct is constructed in the smoke collecting hood. The air inlet duct is communicated with the volute duct, and the air inlet duct covers the upper part of the combustion chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a schematic diagram of a fan assembly according to an embodiment of the present invention.

[0033] Figure 2 is a cross-sectional view of a fan assembly according to an embodiment of the present invention.

[0034] Figure 3 is a three-dimensional schematic diagram of a fan assembly according to an embodiment of the present invention.

[0035] Figure 4 is a three-dimensional schematic diagram of a fan assembly according to another embodiment of the present invention.

[0036] Figure 5 is a three-dimensional schematic diagram of a fan assembly according to still another embodiment of the present invention.

[0037] Figure 6 is a schematic diagram of an anti-freezing device of a fan assembly according to an embodiment of the present invention.

[0038] Figure 7 is an assembly schematic diagram of a seat body, a rotating shaft and blades of an anti-freezing device of a fan assembly according to an embodiment of the present invention.

[0039] Figure 8It is a schematic diagram of the seat body of the anti-freezing device of the fan assembly according to an embodiment of the present utility model.

[0040] Figure 9 It is a schematic diagram of a gas water heater according to an embodiment of the present utility model.

[0041] Reference numerals: fan assembly 100, fan housing 10, volute air duct 101, volute inlet 1011, volute outlet 1012, air inlet duct 102, first housing 111, second housing 112, third housing 113, fourth housing 114, fifth housing 115, sixth housing 116, smoke collecting hood 117, impeller device 30, motor device 40, anti-freezing device 50, air duct 51, blade 52, first sub-blade 521, second sub-blade 522, seat body 53, annular rib 531, strip rib 532, retaining rib 533, first air outlet 501, second air outlet 502, relief groove 503, first flanging part 504, second flanging part 505, rotating shaft 54, gas water heater 1000, combustion chamber 200. Detailed Description of the Embodiment

[0042] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, in which 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 are intended to explain the present utility model, but should not be construed as limiting the present utility model.

[0043] As Figures 1 to 5 , the fan assembly 100 according to an embodiment of the present utility model includes: a fan housing 10 and an impeller device 30. The fan housing 10 is provided with a volute air duct 101, and a volute inlet 1011 and a volute outlet 1012 are provided. The volute air duct 101 is provided between the volute inlet 1011 and the volute outlet 1012. The impeller device 30 is arranged in the volute air duct 101, and the impeller device 30 is rotatable, and can drive the air flow to flow from the volute inlet 1011 to the volute outlet 1012 by rotation, so as to realize the driving of the air flow.

[0044] The fan assembly 100 further includes a motor device 40. The motor device 40 is connected to the impeller device 30 and is used to drive the impeller device 30 to rotate. Optionally, the motor device 40 may include a motor stator and a motor rotor. The motor rotor is rotationally matched with the motor stator. The motor stator is connected to the motor housing and is relatively stationary. The motor rotor is drivingly connected to the impeller device 30.

[0045] In addition, the fan assembly 100 further includes an anti-freezing device 50. The anti-freezing device 50 includes an air duct 51 and blades 52. The air duct 51 is connected to the fan housing 10 and communicates with the volute outlet 1012. The blades 52 are connected to the air duct 51 and are configured to open unidirectionally along the air outlet direction of the volute air duct 101. That is to say, after the air flow or flue gas in the volute air duct is sent out from the volute outlet, it can be sent out of the fan assembly through the anti-freezing device; while the air flow outside the fan assembly is difficult to flow back into the fan assembly through the anti-freezing device.

[0046] For the fan assembly 100 according to the embodiment of the present invention, the anti-freezing device 50 is provided, and the anti-freezing device 50 is connected to the volute air duct 101 through the air duct 51. During use, under the suction action of the fan assembly 100, flue gas and the like can enter the air duct 51 and open the blades 52 to discharge the flue gas; when the external air flows back along the air duct 51, the blades 52 will block the air flow from flowing back, so as to avoid the discharged flue gas and the like from flowing back into the fan assembly 100. In addition, when the outdoor temperature is relatively low, the anti-freezing device 50 can be used to prevent the cold air in the external environment from flowing back into the fan assembly 100, thereby realizing the anti-freezing of the fan assembly 100 and the gas water heater 1000 having the fan assembly 100.

[0047] Such as Figure 2 , in some embodiments, the air duct 51 is sleeved and fitted on the inner side of the peripheral wall of the volute outlet 1012. Through the sleeved fit between the air duct 51 and the peripheral wall of the volute outlet 1012, the rapid assembly of the air duct 51 and the volute outlet 1012 can be realized, and the stability of the connection structure can be improved. In addition, by sleeving the air duct 51 on the inner side of the peripheral wall of the volute outlet 1012, the peripheral wall of the volute outlet 1012 can be used to position the air duct 51, improve the stability of the air duct 51, and facilitate the positioning of the blades 52 on the air duct 51.

[0048] Of course, in the present invention, the air duct 51 can also be sleeved and fitted on the outer side of the peripheral wall of the volute outlet 1012 to effectively position the volute outlet 1012.

[0049] Optionally, referring to the attached Figures 1 to 5, the fan assembly 100 of the present utility model can have front-back direction, up-down direction and left-right direction that are perpendicular to each other. Among them, the fan assembly 100 has an air inlet duct 102 and a volute duct 101. The air inlet duct 102 is connected to the volute duct 101. Airflow can enter the volute duct 101 through the air inlet duct 102, and after passing through the volute duct 101, it is sent out from the volute outlet 1012. Among them, one end plate of the volute duct 101 along the axial direction is provided with a volute inlet 1011 and the peripheral wall is provided with a volute outlet 1012. The air inlet duct 102 is connected to the volute inlet 1011. Of course, in the present utility model, the orientation is mainly described according to the drawings, which is not a limitation on the protection scope of the present utility model. The technical solutions obtained after adjusting the direction according to the solution of the present utility model are still within the protection scope of the present utility model, such as swapping the left-right direction in the drawings, etc.

[0050] Combined with the attached Figure 1 and Figure 2 , the axis of the volute duct 101 is configured to be inclined in the direction from the lower left to the upper right, the inlet axis of the air inlet duct 102 is parallel to the up-down direction, and the outlet axis of the air duct 51 is parallel to the up-down direction. Among them, the airflow can enter the air inlet duct 102 through the inlet of the air inlet duct 102 in the direction from bottom to top; under the guiding or collecting action of the air inlet duct 102, it enters the volute duct 101 through the volute inlet 1011; then it enters the anti-freezing device 50 through the volute outlet 1012 of the volute duct 101, and finally is sent out from the anti-freezing device 50. The whole process is smooth and the wind resistance is small, which can effectively improve the energy efficiency of the fan assembly 100.

[0051] Optionally, a flanging structure is provided on the periphery of the volute inlet 1011. The flanging structure is configured to extend obliquely in the direction from the air inlet duct 102 to the volute duct 101, which can facilitate the connection between the air inlet duct 102 and the volute duct 101, and connect the volute duct 101 and the air inlet duct 102 through this inlet, facilitating smoke exhaust. In addition, the flanging structure can form a guiding structure to guide the smoke, further reducing the wind resistance at the volute inlet 1011 and further gathering the smoke to facilitate smoke exhaust. Among them, the flanging structures cooperate to form a ring extending along the periphery of the volute inlet 1011.

[0052] The structures of the fan housing 10 and the air duct 51 can include but are not limited to the following embodiments.

[0053] Embodiment 1

[0054] Such as Figure 3, the fan housing 10 includes a first housing 111 and a second housing 112. The first housing 111 and the second housing 112 are connected along the axial direction of the impeller device 30. The first housing 111 includes a first sub-housing and a third sub-housing, and the second housing 112 includes a second sub-housing and a fourth sub-housing. The volute air duct 101 is disposed between the first sub-housing and the second sub-housing, and the volute outlet 1012 is disposed between the third sub-housing and the fourth sub-housing.

[0055] Optionally, the first sub-housing may include a first side plate and a first end plate. The first side plate may be configured as a cylinder, and the first end plate is connected to one side edge of the first side plate. The second sub-housing may include a second side plate and a second end plate. The second side plate may be configured as a cylinder, and the second end plate is 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 construct the volute air duct 101. The third sub-housing is connected to the first side plate, and the fourth sub-housing is connected to the second side plate. The third sub-housing and the fourth sub-housing are connected to construct the volute outlet 1012.

[0056] In addition, the fan housing 10 is further provided with an air inlet duct 102. The air inlet duct 102 is disposed in the first housing 111. The first end plate may be provided with a volute inlet 1011. The first housing 111 may further include a third side plate. The third side plate is configured as a smoke collecting hood 117. The inside of the smoke collecting hood 117 constructs the air inlet duct 102. The third side plate may be connected to the first end plate. The third side plate may be set as a cylindrical shape, a square cylindrical shape, a triangular cylindrical shape or other shapes. During the assembly process of the fan assembly 100, the impeller can be installed in the volute air duct 101. By splicing the first housing 111 and the second housing 112 to form the volute air duct 101, the installation of the impeller can be facilitated, and the support provided by the impeller device 30 of the second end plate can be utilized. Through this setting form, the installation efficiency of the impeller can be improved.

[0057] In some embodiments of the present utility model, the first housing 111 is configured to be integrally formed. By integrally forming, the processing efficiency of the first housing 111 can be improved, the processing cost of the first housing 111 can be reduced, and it can also ensure that the first housing 111 has higher structural strength and sealing effect, thereby improving the service life and energy efficiency of the fan assembly 100. In addition, the second housing 112 may also be configured to be integrally formed. When both the first housing 111 and the second housing 112 are integrally formed structures, the service life and energy efficiency of the fan assembly 100 can be further improved, and problems such as stress concentration at the connection between the first housing 111 and the second housing 112 caused by thermal expansion and contraction of the first housing 111 and the second housing 112 can be avoided.

[0058] At least one of the first housing 111 and the second housing 112 in the present utility model can be set as a plastic housing, which can further improve the processing efficiency of the fan assembly 100 and reduce the cost of the fan assembly 100. In addition, in combination with the foregoing, in the present utility model, the air duct structure is constructed by connecting the first housing 111 and the second housing 112 in the front-rear direction, which can simplify the structures of the first housing 111 and the second housing 112, facilitate plastic molding of the first housing 111 and the second housing 112, thereby effectively reducing the cost of the fan assembly 100 and improving the molding efficiency of the fan assembly 100.

[0059] Among them, the first housing 111 and the second housing 112 in the present utility model can be made of heat-resistant materials and can be installed in the special environment of a water heater. For example, the first housing 111 and the second housing 112 can be formed by die-casting through injection molding respectively, and after molding, the first housing 111 and the second housing 112 are connected together, that is, the original multiple sheet metals are simplified into a housing composed of two components, which simplifies the process flow and reduces the processing cost.

[0060] In addition, at least one of the first housing 111 and the second housing 112 in the present utility model can be configured as a BMC housing. BMC is essentially a molding intermediate material for manufacturing glass fiber-reinforced thermosetting products by a semi-dry method. 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 up to degrees Celsius. Therefore, when the housing made of BMC material is installed in a water heater, it will not melt due to overheating.

[0061] In addition, at least one of the first housing 111 and the second housing 112 can also be made of metal material.

[0062] Among them, a connecting member is provided between the first housing 111 and the second housing 112. Specifically, the connecting member can be a bolt. In other embodiments, the connecting member can also be a wire for connection, etc. In addition, the first housing 111 and the second housing 112 can also be connected by gluing. The first housing 111 and the second housing 112 can be connected in a gluing form. The above connection method is relatively simple and convenient to operate.

[0063] In addition, the air duct 51 can be sleeved and fitted inside the peripheral wall of the volute outlet 1012. During the assembly process of the first housing 111 and the second housing 112, the positioning of the fan housing 10 and the air duct 51 can be achieved by using the assembly of the first housing 111 and the second housing 112, thus simplifying the structure and assembly of the fan assembly 100. The air duct 51 can also be sleeved and fitted outside the peripheral wall of the volute outlet 1012. After the first housing 111 and the second housing 112 are butted, through the sleeving of the air duct 51 and the peripheral wall of the volute outlet 1012, the third sub-housing and the fourth sub-housing are passed through the inside of the air duct 51 to achieve the pre-positioning of the first housing 111 and the second housing 112, thus facilitating the assembly of the fan assembly 100.

[0064] Embodiment 2

[0065] Such as Figure 4 , the fan housing 10 includes a third housing 113 and a fourth housing 114. The third housing 113 and the fourth housing 114 are connected along a predetermined direction. The third housing 113 includes a fifth sub-housing and a seventh sub-housing. The fourth housing 114 includes a sixth sub-housing and an eighth sub-housing. The volute air duct 101 is arranged between the fifth sub-housing and the sixth sub-housing. The volute outlet 1012 is arranged between the seventh sub-housing and the eighth sub-housing. The predetermined direction is perpendicular to the axis direction of the volute outlet 1012 and the axis of the impeller device 30.

[0066] The fifth sub-housing may include a third end plate, a fourth end plate and a fourth side plate. The sixth sub-housing may include a fifth end plate, a sixth end plate and a fifth side plate. The fourth side plate is connected between the third end plate and the fourth end plate. The fifth side plate is connected between the fifth end plate and the sixth end plate. The third end plate and the fifth end plate are connected into a flat plate shape. The fourth end plate and the sixth end plate are connected into a flat plate shape. The fourth side plate and the fifth side plate are connected into a surrounding plate shape. A volute air duct 101 is formed between the third end plate, the fourth end plate, the fourth side plate, the fifth end plate, the sixth end plate and the fifth side plate. The seventh sub-housing is connected to the fourth side plate. The eighth sub-housing is connected to the fifth side plate. The seventh sub-housing and the eighth sub-housing are connected and construct the volute outlet 1012.

[0067] In addition, the blower housing 10 is further provided with an air inlet duct 102. A volute inlet 1011 is formed between the third end plate and the fourth end plate. The third housing 113 further includes a sixth side plate, and the fourth housing 114 further includes a seventh side plate. The sixth side plate can be connected to the third end plate, and the seventh side plate can be connected to the fifth end plate. The sixth side plate and the seventh side plate can be configured to form a smoke collecting hood 117. An air inlet duct 102 is formed inside the smoke collecting hood 117. The smoke collecting hood 117 can be set to a cylindrical shape, a square tube shape, a triangular tube shape, or other shapes. During the assembly process of the blower assembly 100, the impeller can be installed in the volute air duct 101. The volute air duct 101 is formed by splicing the third housing 113 and the fourth housing 114, which facilitates the installation of the impeller. Moreover, the cooperation between the fourth end plate and the sixth end plate can be utilized to support the impeller. Through this setting form, the installation efficiency of the impeller can be improved.

[0068] In some embodiments of the present utility model, the third housing 113 is configured to be integrally formed. By integrally forming, the processing efficiency of the third housing 113 can be improved, the processing cost of the third housing 113 can be reduced, and moreover, it can ensure that the third housing 113 has higher structural strength and sealing effect, thereby improving the service life and energy efficiency of the blower assembly 100. In addition, the fourth housing 114 can also be configured to be integrally formed. When both the third housing 113 and the fourth housing 114 are set to integrally formed structures, the service life and energy efficiency of the blower assembly 100 can be further improved, and problems such as stress concentration at the connection between the third housing 113 and the fourth housing 114 caused by thermal expansion and contraction of the third housing 113 and the fourth housing 114 can be avoided.

[0069] At least one of the third housing 113 and the fourth housing 114 in the present utility model can be set as a plastic housing, which can further improve the processing efficiency of the blower assembly 100 and reduce the cost of the blower assembly 100. In addition, in combination with the foregoing, in the present utility model, the air duct structure is constructed by connecting the third housing 113 and the fourth housing 114 in the front-rear direction, which can simplify the structures of the third housing 113 and the fourth housing 114, make it convenient for the third housing 113 and the fourth housing 114 to be plastic-molded, thereby effectively reducing the cost of the blower assembly 100 and improving the molding efficiency of the blower assembly 100.

[0070] Among them, the third housing 113 and the fourth housing 114 in the present utility model can be set as high-temperature resistant materials and can be installed in the special environment of a water heater. For example, the third housing 113 and the fourth housing 114 can be respectively formed by die-casting through injection molding. After molding, the third housing 113 and the fourth housing 114 are connected together, that is, the original multiple sheet metals are simplified into a housing composed of two components, which simplifies the process flow and reduces the processing cost.

[0071] In addition, at least one of the third housing 113 and the fourth housing 114 in the present utility model can be configured to cooperate as a BMC housing. BMC is essentially a molding intermediate material for manufacturing glass fiber reinforced thermosetting products by a semi-dry process. 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 up to degrees Celsius. Therefore, when the housing made of BMC material is installed in the water heater, it will not melt due to overheating.

[0072] In addition, at least one of the third housing 113 and the fourth housing 114 can also be made of metal material.

[0073] In addition, a connecting member is connected between the third housing 113 and the fourth housing 114. Specifically, the connecting member can be a bolt. In other embodiments, the connecting member can also be a wire for connection, etc. By adding a connecting member on the third housing 113 and the fourth housing 114, the connection between the third housing 113 and the fourth housing 114 is more stable, strengthening the connection stability between the third housing 113 and the fourth housing 114, and thus the sealing effect of the connection between the third housing 113 and the fourth housing 114 is better. The third housing 113 and the fourth housing 114 can also be adhesively connected.

[0074] In addition, the air duct 51 can be sleeved and fitted on the inner side of the peripheral wall of the volute outlet 1012. During the assembly process of the third housing 113 and the fourth housing 114, the positioning of the fan housing 10 and the air duct 51 can be realized by using the assembly of the third housing 113 and the fourth housing 114, thereby simplifying the structure and assembly of the fan assembly 100. The air duct 51 can also be sleeved and fitted on the outer side of the peripheral wall of the volute outlet 1012. After the third housing 113 and the fourth housing 114 are butted, the pre-positioning of the third housing 113 and the fourth housing 114 can be realized by the sleeving of the air duct 51 and the peripheral wall of the volute outlet 1012, thereby facilitating the assembly of the fan assembly 100.

[0075] Embodiment Three

[0076] As Figure 5 , the fan housing 10 includes a fifth housing 115 and a sixth housing 116. The fifth housing 115 and the sixth housing 116 are connected along the axial direction of the volute outlet 1012. The fifth housing 115 includes a ninth sub-housing and a tenth sub-housing. The volute air duct 101 is provided between the ninth sub-housing and the sixth housing 116, and the tenth sub-housing surrounds the volute outlet 1012.

[0077] The ninth sub-shell may include a seventh end plate, an eighth end plate, and an eighth side plate. The sixth outer shell 116 may include a ninth end plate, a tenth end plate, and a ninth side plate. The eighth side plate is connected between the seventh end plate and the eighth end plate, and the ninth side plate is connected between the ninth end plate and the tenth end plate. The seventh end plate and the ninth end plate are connected into a flat plate shape, the eighth end plate and the tenth end plate are connected into a flat plate shape, and the eighth side plate and the ninth side plate are connected into a surrounding plate shape. A volute air duct 101 is formed among the seventh end plate, the eighth end plate, the eighth side plate, the ninth end plate, the tenth end plate, and the ninth side plate. The sixth outer shell 116 is connected to the eighth side plate, and the inner side of the tenth sub-shell surrounds the volute outlet 1012.

[0078] In addition, the fan housing 10 is further provided with an air inlet duct 102. A volute inlet 1011 is constructed between the seventh end plate and the ninth end plate. The fifth outer shell 115 further includes a tenth side plate, and the sixth outer shell 116 further includes an eleventh side plate. The tenth side plate may be connected to the seventh end plate, the eleventh side plate may be connected to the ninth end plate, and the tenth side plate and the eleventh side plate may be configured as a smoke collecting hood 117. An air inlet duct 102 is constructed inside the smoke collecting hood 117. The smoke collecting hood 117 may be set in a cylindrical shape, a square tube shape, a triangular tube shape, or other shapes. During the assembly process of the fan assembly 100, the impeller can be installed in the volute air duct 101. By splicing the fifth outer shell 115 and the sixth outer shell 116 to form the volute air duct 101, the installation of the impeller can be facilitated, and the cooperation of the eighth end plate and the tenth end plate can be utilized to support the impeller. Through this setting form, the installation efficiency of the impeller can be improved.

[0079] In some embodiments of the present utility model, the fifth outer shell 115 is configured to be integrally formed. By integrally forming, the processing efficiency of the fifth outer shell 115 can be improved, the processing cost of the fifth outer shell 115 can be reduced, and it can also ensure that the fifth outer shell 115 has higher structural strength and sealing effect, thereby improving the service life and energy efficiency of the fan assembly 100. In addition, the sixth outer shell 116 may also be configured to be integrally formed. When both the fifth outer shell 115 and the sixth outer shell 116 are set to be integrally formed structures, the service life and energy efficiency of the fan assembly 100 can be further improved, and problems such as stress concentration at the connection between the fifth outer shell 115 and the sixth outer shell 116 caused by thermal expansion and contraction of the fifth outer shell 115 and the sixth outer shell 116 can be avoided.

[0080] At least one of the fifth housing 115 and the sixth housing 116 in the present utility model can be set as a plastic housing, which can further improve the processing efficiency of the fan assembly 100 and reduce the cost of the fan assembly 100. In addition, in combination with the foregoing, the air duct structure is constructed by connecting the fifth housing 115 and the sixth housing 116 in the front-back direction in the present utility model, which can simplify the structures of the fifth housing 115 and the sixth housing 116, making it convenient for the fifth housing 115 and the sixth housing 116 to be plastic-molded, thereby effectively reducing the cost of the fan assembly 100 and improving the molding efficiency of the fan assembly 100.

[0081] Among them, the fifth housing 115 and the sixth housing 116 in the present utility model can be made of heat-resistant materials and can be installed in the special environment of the water heater. For example, the fifth housing 115 and the sixth housing 116 can be formed by die-casting through injection molding respectively, and the formed fifth housing 115 and the sixth housing 116 are connected together, that is, the original multiple sheet metals are simplified into a housing composed of two components, which simplifies the process flow and reduces the processing cost.

[0082] In addition, at least one of the fifth housing 115 and the sixth housing 116 in the present utility model can be configured as a BMC housing. BMC is essentially a molding intermediate material for manufacturing glass fiber-reinforced thermosetting products by a semi-dry method. 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 up to degrees Celsius. Therefore, when the housing made of BMC material is installed in the water heater, it will not melt due to overheating.

[0083] In addition, at least one of the fifth housing 115 and the sixth housing 116 can also be made of metal material.

[0084] In addition, a connecting member is connected between the fifth housing 115 and the sixth housing 116. Specifically, the connecting member can be a bolt. In other embodiments, the connecting member can also be a wire for connection, etc. Adding a connecting member on the fifth housing 115 and the sixth housing 116 makes the connection between the fifth housing 115 and the sixth housing 116 more stable, strengthens the connection stability between the fifth housing 115 and the sixth housing 116, and then the sealing effect of the connection between the fifth housing 115 and the sixth housing 116 is better. The fifth housing 115 and the sixth housing 116 can also be connected by gluing.

[0085] In addition, the air duct 51 can be sleeved and fitted on the inner side of the peripheral wall of the volute outlet 1012. For example, the air duct 51 is sleeved and fitted on the inner side of the tenth sub-housing. The air duct 51 can also be sleeved and fitted on the outer side of the peripheral wall of the volute outlet 1012. For example, the air duct 51 is sleeved and fitted on the outer side of the tenth sub-housing.

[0086] Embodiment 4

[0087] The air duct 51 may include a first half pipe and a second half pipe, and the first half pipe and the second half pipe are enclosed to form the air duct 51. Among them, the air duct 51 may be sleeved and fitted on the inner side of the circumferential wall of the volute outlet 1012, and the air duct 51 may also be sleeved and fitted on the outer side of the circumferential wall of the volute outlet 1012. For example, the air duct 51 is sleeved on the outer side of the tenth sub-volute. By setting the air duct 51 to be enclosed by the first half pipe and the second half pipe, it is convenient for the assembly of the air duct 51 and the fan housing 10, simplifies the assembly process flow of the fan assembly 100, improves the assembly efficiency of the fan assembly 100 and the stability of the connection structure after assembly.

[0088] In addition, the integrally formed part in the foregoing embodiment may be integrally formed of plastic, such as integrally injection molded, integrally vacuum formed, etc. By integrally forming plastic parts, the forming process can be simplified, the production and assembly of the fan assembly 100 can be simplified, the production cost can be reduced and the efficiency can be improved. Moreover, the sealing effect can be optimized, thereby improving the stability and service life of the fan assembly 100.

[0089] In some embodiments, the fan housing 10 is configured as a high-temperature resistant housing and can be installed in a special environment of a water heater. In addition, the fan housing 10 can also be set as a plastic housing, which can further improve the processing efficiency of the fan assembly 100 and reduce the cost of the fan assembly 100. The fan housing 10 can also be a BMC housing. BMC is essentially a molding intermediate material for manufacturing glass fiber reinforced thermosetting products by a semi-dry method. 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 up to degrees Celsius. Therefore, the housing made of BMC material will not melt due to overheating when installed in the water heater.

[0090] Of course, the fan housing 10 of the present utility model can also be set as other forms of housings. For example, the fan housing 10 can also be set as a resin housing.

[0091] In some examples, the circumferential wall of the volute outlet 1012 has a first section and a second section distributed along the axis. The radial dimension of the outer peripheral surface of the first section is smaller than the radial dimension of the outer peripheral surface of the second section. One end of the air duct 51 is sleeved on the outside of the first section and is opposite to the second section along the axis direction of the volute outlet 1012. The step structure between the first section and the second section can be used to position the air duct 51, avoiding the air duct 51 from extending excessively into the volute air duct 101 and affecting the operation stability of the fan assembly 100, and can also improve the assembly efficiency and stability between the air duct 51 and the fan housing 10. In addition, the drop between the inner surface of the air duct 51 and the inner surface of the volute outlet 1012 can be reduced, and the air resistance can be reduced, so that the air flow can smoothly and quickly pass through the area where the volute outlet 1012 and the air duct 51 are connected.

[0092] In other examples, the air duct 51 can also be sleeved and fitted to the inner side of the peripheral wall of the volute outlet 1012. The peripheral wall of the volute outlet 1012 has a third section and a fourth section distributed along the axis. The radial dimension of the inner peripheral surface of the third section is greater than that of the inner peripheral surface of the fourth section. One end of the air duct 51 is sleeved on the third section and is opposite to the fourth section along the axis direction of the volute outlet 1012.

[0093] In some embodiments, the blade 52 is rotatably connected to the air duct 51. When the internal air pressure in the volute air duct 101 is higher than a predetermined value of the external air pressure of the fan assembly 100, the blade 52 is in the first position and opens the air duct 51; when the air pressure in the volute air duct 101 is not higher than the external air pressure of the fan assembly 100, the blade 52 is in the second position and closes the air duct 51. In this way, the blade 52 can have a certain opening pressure to facilitate smooth smoke exhaust, and this opening pressure can be a value adapted to the weight of the blade 52, the rotational resistance, etc.

[0094] Such as Figures 6 to 8 , the anti-freezing device 50 further includes a seat body 53. The seat body 53 is connected to the air duct 51, and the seat body 53 is provided with an air outlet. The seat body 53 can provide support for the blade 52 to facilitate the rotation of the blade 52 to open and close the air duct 51; the anti-freezing device 50 further includes a rotating shaft 54. The rotating shaft 54 is connected to the seat body 53, the blade 52 is connected to the rotating shaft 54 and is rotatable around the rotating shaft 54. The blade 52 opens the air outlet in the first position and closes the air outlet in the second position. Among them, the blade 52 can be arranged to be rotatably connected to the rotating shaft 54; the blade 52 can also be relatively stationary with the rotating shaft 54, and the rotating shaft 54 is rotatably connected to the seat body 53. It can facilitate the opening and closing of the air duct 51 by the blade 52, simplify the structure of the anti-freezing device 50, and improve the stability of the anti-freezing device 50.

[0095] Optionally, such as Figure 8 , the seat body 53 includes an annular rib 531 and a strip-shaped rib 532. The annular rib 531 is arranged inside the air duct 51 and along the peripheral wall of the air duct 51. The two ends of the strip-shaped rib 532 are respectively connected to the opposite sides of the annular rib 531. The strip-shaped rib 532 divides the first air outlet 501 and the second air outlet 502 in the annular rib 531. Among them, the blade 52 includes a first sub-blade 521 and a second sub-blade 522. The first sub-blade 521 is connected to the rotating shaft 54 and is rotatable to open and close the first air outlet 501, and the second sub-blade 522 is connected to the rotating shaft 54 and is rotatable to open and close the second air outlet 502. Using the annular rib 531 and the strip-shaped rib 532 to form the first air outlet 501 and the second air outlet 502 can facilitate the opening and closing of the blade 52 and solve the problem of interference between the blade 52 and the air duct 51.

[0096] Among them, the rotating shaft 54 is opposite to the strip-shaped rib 532 along the axis of the air duct 51. By using the shielding of the strip-shaped rib 532, it is possible to avoid the situation where air flows through the gap between the first sub-blade 521 and the second sub-blade 522 when the blade 52 is not opened, and it is possible to improve the anti-freezing effect and structural stability of the anti-freezing device 50.

[0097] Optionally, as Figure 7 and Figure 8 , a relief groove 503 is provided on the outer peripheral surface of the annular rib 531. The end of the rotating shaft 54 passes through the annular rib 531 and is located in the relief groove 503, which can prevent interference between the rotating shaft 54 and the air duct 51. During the assembly process, only the seat body 53 needs to be assembled with the air duct 51, which can simplify the assembly efficiency and stability of the anti-freezing device 50.

[0098] Optionally, as Figure 8 , a first flanging portion 504 is provided along the outer periphery of the annular rib 531. The first flanging portion 504 is sleeved on the inner side surface of the air duct 51, which can improve the assembly stability and structural strength between the seat body 53 and the air duct 51, and avoid problems such as the flipping of the seat body 53. In addition, second flangings are provided along the inner peripheries of the first air outlet 501 and the second air outlet 502, and the blade 52 is supported by the second flangings in the second position. This can facilitate the stable cooperation between the blade 52 and the seat body 53, so as to improve the sealing performance between the blade 52 and the seat body 53 when the blade 52 closes the first air outlet 501 and the second air outlet 502. In addition, the first sub-blade 521 is provided with a first recessed portion, and the first recessed portion can be embedded into the first air outlet 501; the second sub-blade 522 is provided with a second recessed portion, and the second recessed portion can be embedded into the second air outlet 502.

[0099] In addition, the seat body 53 further includes a retaining rib 533, and the retaining rib 533 is configured to limit the rotation angles of the first sub-blade 521 and the second sub-blade 522. Specifically, the retaining rib 533 is provided at the rotation trajectories of the first sub-blade 521 and the second sub-blade 522. That is to say, when the first sub-blade 521 is flipped to a predetermined angle, the retaining rib 533 will limit the further rotation of the first sub-blade 521 to prevent the first sub-blade 521 from rotating too much and being unable to return to the closed position. In addition, when the second sub-blade 522 is flipped to a predetermined angle, the retaining rib 533 will limit the further rotation of the second sub-blade 522 to prevent the second sub-blade 522 from rotating too much and being unable to return to the closed position. Optionally, the retaining rib 533 is provided above the rotating shaft; or the retaining rib 533 is provided above the strip-shaped rib. Optionally, the rotation angles of the first sub-blade and the second sub-blade are not greater than 90°; or when the first sub-blade and the second sub-blade contact the retaining rib, during the rotation process of the first sub-blade and the second sub-blade, the angle with the horizontal plane is maintained at less than 90°.

[0100] In some embodiments, the air duct 51 extends in the vertical direction, and its lower end is connected to the fan housing 10. When the air pressure in the volute air duct 101 is not higher than the external air pressure of the fan assembly 100, the blade 52 is supported on the seat body 53. This facilitates smoke exhaust and can reduce the possibility of air flow backflow.

[0101] As Figure 9 , the gas water heater 1000 according to an embodiment of the present invention includes: the aforementioned fan assembly 100 and the combustion chamber 200. The combustion chamber 200 is connected to the fan assembly 100 and communicates with the volute inlet 1011 of the volute air duct 101. Among them, a burner can be arranged in the combustion chamber 200. During the combustion process of the burner, flue gas is generated. Under the suction action of the fan assembly 100, the flue gas can be collected through the air inlet duct 102 and sent out from the outlet of the fan assembly 100. The air resistance of the fan assembly 100 in the present invention is small and it is easy to form, which can improve the production efficiency of the fan assembly 100 while ensuring the flue gas circulation.

[0102] In some embodiments, the combustion chamber 200 and the fan assembly 100 are distributed in the left - right direction, and the left - right direction is parallel to the axis of the volute air duct 101. This can reduce the flue gas resistance and improve the smoke exhaust performance, so as to provide a better combustion environment for the combustion chamber 200, realize the full combustion of gas, and save energy and protect the environment. For example, the air inlet duct 102 can be arranged above the combustion chamber 200.

[0103] Optionally, the fan housing 10 includes a smoke collecting hood 117. An air inlet duct 102 is constructed inside the smoke collecting hood 117. The air inlet duct 102 communicates with the volute air duct 101 and covers the combustion chamber 200 from above. This can facilitate the use of the smoke collecting hood 117 to collect flue gas, realize smoke exhaust, and improve the safety and stability of the gas water heater 1000.

[0104] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0105] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0106] In the present utility model, unless otherwise clearly defined and limited, terms such as "installed", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0107] In the present utility model, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0108] In the description of this specification, the descriptions with reference to terms such as "an embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0109] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present utility model.

Claims

1. A fan assembly (100), characterized in that, Comprising: A blower housing (10), the blower housing (10) being provided with a volute air duct (101), the volute air duct (101) having a volute inlet (1011) and a volute outlet (1012); An impeller device (30), the impeller device (30) being rotatably arranged inside the volute air duct (101); A motor device (40), the motor device (40) being drivingly connected to the impeller device (30) for driving the impeller device (30) to rotate; An anti-freezing device (50), the anti-freezing device (50) comprising an air duct (51) and blades (52), the air duct (51) being connected to the blower housing (10) and communicating with the volute outlet (1012), the blades (52) being connected to the air duct (51) and configured to open unidirectionally along the air outlet direction of the volute air duct (101).

2. The blower assembly (100) according to claim 1, wherein, The air duct (51) is sleeved and fitted on the inner side of the peripheral wall of the volute outlet (1012); or, the air duct (51) is sleeved and fitted on the outer side of the peripheral wall of the volute outlet (1012).

3. The blower assembly (100) according to claim 1 or 2, wherein the blower housing (10) comprises a first housing (111) and a second housing (112), the first housing (111) and the second housing (112) being connected along the axial direction of the impeller device (30), the first housing (111) comprising a first sub-housing and a third sub-housing, the second housing (112) comprising a second sub-housing and a fourth sub-housing, the volute air duct (101) being arranged between the first sub-housing and the second sub-housing, and the volute outlet (1012) being arranged between the third sub-housing and the fourth sub-housing; or, the blower housing (10) comprises a third housing (113) and a fourth housing (114), the third housing (113) and the fourth housing (114) being connected along a predetermined direction, the third housing (113) comprising a fifth sub-housing and a seventh sub-housing, the fourth housing (114) comprising a sixth sub-housing and an eighth sub-housing, the volute air duct (101) being arranged between the fifth sub-housing and the sixth sub-housing, and the volute outlet (1012) being arranged between the seventh sub-housing and the eighth sub-housing, the predetermined direction being perpendicular to the axial direction of the volute outlet (1012) and the axis of the impeller device (30); or, the blower housing (10) comprises a fifth housing (115) and a sixth housing (116), the fifth housing (115) and the sixth housing (116) being connected along the axial direction of the volute outlet (1012), the fifth housing (115) comprising a ninth sub-housing and a tenth sub-housing, the volute air duct (101) being arranged between the ninth sub-housing and the sixth housing (116), and the tenth sub-housing surrounding the volute outlet (1012).

4. The fan assembly (100) according to claim 3, characterized in that, The first outer shell (111) is integrally formed and / or the second outer shell (112) is integrally formed; or, the third outer shell (113) is integrally formed and / or the fourth outer shell (114) is integrally formed; or, the fifth outer shell (115) is integrally formed and / or the sixth outer shell (116) is integrally formed.

5. The blower assembly (100) according to claim 1 or 2, characterized in that, The air duct (51) includes a first half pipe and a second half pipe, and the first half pipe and the second half pipe enclose to form the air duct (51).

6. The fan assembly (100) according to claim 1 or 2, characterized in that, The fan housing (10) is configured as a high-temperature resistant housing.

7. The fan assembly (100) according to claim 1 or 2, characterized in that, The fan housing (10) is configured as a plastic housing or a resin housing.

8. The blower assembly (100) according to claim 1 or 2, characterized in that, The fan housing (10) is configured as a BMC housing.

9. The blower assembly (100) according to claim 1, characterized in that, The peripheral wall of the volute outlet (1012) has a first section and a second section distributed along the axis. The radial dimension of the outer peripheral surface of the first section is smaller than that of the outer peripheral surface of the second section. One end of the air duct (51) is sleeved outside the first section and is opposite to the second section along the axis direction of the volute outlet (1012). Or, the peripheral wall of the volute outlet (1012) has a third section and a fourth section distributed along the axis. The radial dimension of the inner peripheral surface of the third section is larger than that of the inner peripheral surface of the fourth section. One end of the air duct (51) is sleeved on the third section and is opposite to the fourth section along the axis direction of the volute outlet (1012).

10. The fan assembly (100) according to any one of claims 1-2, characterized in that, The blade (52) is rotatably connected to the air duct (51). When the internal air pressure in the volute air duct (101) is higher than a predetermined value of the external air pressure of the fan assembly (100), the blade (52) is in the first position and opens the air duct (51); when the air pressure in the volute air duct (101) is not higher than the external air pressure of the fan assembly (100), the blade (52) is in the second position and closes the air duct (51).

11. The fan assembly (100) according to claim 1, characterized in that, The antifreeze device (50) further includes: A seat body (53), the seat body (53) is connected to the air duct (51), and the seat body (53) is provided with an air outlet. A rotating shaft (54), the rotating shaft (54) is connected to the seat body (53), the blade (52) is connected to the rotating shaft (54) and is rotatable around the rotating shaft (54). The blade (52) opens the air outlet in the first position and closes the air outlet in the second position.

12. The fan assembly (100) according to claim 11, characterized in that, The seat body (53) includes an annular rib (531) and a strip-shaped rib (532). The annular rib (531) is arranged inside the air duct (51) and along the peripheral wall of the air duct (51). The two ends of the strip-shaped rib (532) are respectively connected to the opposite sides of the annular rib (531). The strip-shaped rib (532) divides a first air outlet (501) and a second air outlet (502) in the annular rib (531). The blade (52) includes a first sub-blade (521) and a second sub-blade (522). The first sub-blade (521) is connected to the rotating shaft (54) and is rotatable to open and close the first air outlet (501), and the second sub-blade (522) is connected to the rotating shaft (54) and is rotatable to open and close the second air outlet (502).

13. The fan assembly (100) according to claim 12, wherein, The rotating shaft (54) is opposite to the strip-shaped rib (532) along the axis of the air duct (51); and / or, a relief groove (503) is provided on the outer peripheral surface of the annular rib (531), and the end of the rotating shaft (54) passes through the annular rib (531) and is located in the relief groove (503); and / or, a first flanging portion (504) is provided along the outer periphery of the annular rib (531), and the first flanging portion (504) is sleeved on the inner side surface of the air duct (51); and / or, a second flanging is provided along the inner periphery of the first air outlet (501) and the inner periphery of the second air outlet (502), and the blade (52) is supported on the second flanging at the second position; and / or, the seat body (53) further includes a retaining rib (533), and the retaining rib (533) is configured to limit the rotation angles of the first sub-blade (521) and the second sub-blade (522).

14. The fan assembly (100) according to claim 11, wherein, The air duct (51) extends in the up-down direction and is connected to the blower housing (10) at the lower end. When the air pressure in the volute air duct (101) is not higher than the external air pressure of the blower assembly (100), the blade (52) is supported on the seat body (53).

15. The fan assembly (100) according to claim 1, characterized in that, The blower assembly (100) is further provided with an air inlet duct (102), and the air inlet duct (102) is communicated with the volute air duct (101). Wherein, the blower housing (10) includes a first housing (111) and a second housing (112), the first housing (111) and the second housing (112) are connected along the axis direction of the impeller device (30), the volute air duct (101) is provided between the first housing (111) and the second housing (112), and the air inlet duct (102) is provided in the first housing (111); or, the blower housing (10) includes a third housing (113) and a fourth housing (114), the third housing (113) and the fourth housing (114) are connected along a predetermined direction, and the predetermined direction is perpendicular to the axis direction of the volute outlet (1012) and the axis of the impeller device (30), and the volute air duct (101) and the air inlet duct (102) are provided between the third housing (113) and the fourth housing (114); or, the blower housing (10) includes a fifth housing (115) and a sixth housing (116), the fifth housing (115) and the sixth housing (116) are connected along the axis direction of the volute outlet (1012), and the volute air duct (101) and the air inlet duct (102) are provided between the fifth housing (115) and the sixth housing (116).

16. A gas water heater (1000), characterized in that, Comprising: The blower assembly (100) according to any one of claims 1-15; Combustion chamber (200), the combustion chamber (200) is connected to the blower assembly (100) and communicates with the inlet of the volute air duct (101); the blower housing (10) includes a smoke collecting hood (117), an air inlet duct (102) is constructed in the smoke collecting hood (117), the air inlet duct (102) communicates with the volute air duct (101), and the air inlet duct (102) covers the upper part of the combustion chamber (200).

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