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; 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, at least one part of the air pipe and the fan shell are integrally formed, and the blades are connected with the air pipe and are configured to be opened in the air outlet direction of the volute air duct in a one-way mode. According to the fan assembly, the anti-freezing device is arranged, anti-freezing of the fan assembly and the gas water heater with the fan assembly is achieved, at least one part of the air pipe and the fan shell are integrally formed, the structure of the fan assembly is simplified, air leakage is reduced, and the structural strength of the fan assembly is improved.

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 the related art, outdoor air flow is likely to flow back, affecting the operation stability of the gas water heater. Especially in cold winter, 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, the fan housing is provided with a volute air duct, the volute air duct has a volute inlet and a volute outlet; an anti-freezing device, the anti-freezing device includes an air duct and blades, the air duct is connected to the fan housing and communicates with the volute outlet, at least a part of the air duct is integrally formed with the fan housing, and the blades are connected to the air duct and configured to open unidirectionally along the air outlet direction of the volute air duct.

[0005] The fan assembly according to an embodiment of the utility model is provided with an anti-freezing device to achieve anti-freezing of the fan assembly and the gas water heater having the fan assembly, and at least a part of the air duct is integrally formed with the fan housing, simplifying the structure of the fan assembly, reducing air leakage, and improving the structural strength of 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 includes a first pipe portion and a second pipe portion connected in the radial direction, the first pipe portion and the second pipe portion enclose the air duct, and the blades are arranged between the first pipe portion and the second pipe portion. Among them, the first pipe portion is integrally formed with at least a part of the fan housing; and / or, the second pipe portion is integrally formed with at least a part of the fan housing.

[0008] 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 axis of the volute air duct, and the volute air duct is arranged between the first housing and the second housing. Among them, the first pipe portion is integrally formed with the first housing; and / or, the second pipe portion is integrally formed with the second 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 volute air duct is disposed between the third housing and the fourth housing, the predetermined direction is perpendicular to the axis of the volute outlet and the axis of the volute air duct, wherein the first pipe portion is integrally formed with the third housing; and / or, the second pipe portion is integrally formed with the fourth housing;

[0010] Alternatively, the blower housing includes a fifth housing and a sixth housing, the fifth housing and the sixth housing are connected along the axis of the volute outlet, the volute air duct is disposed between the fifth housing and the sixth housing, wherein one of the first pipe portion and the second pipe portion is integrally formed with the fifth housing.

[0011] In some embodiments, the air duct includes a third pipe portion and a fourth pipe portion connected along an axis, the third pipe portion is integrally formed with at least a part of the blower housing, and the blade is disposed on the third pipe portion, on the fourth pipe portion, or between the third pipe portion and the fourth pipe portion.

[0012] 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 axis of the volute air duct, the volute air duct is disposed between the first housing and the second housing, wherein the third pipe portion is integrally formed with the first housing or the second housing;

[0013] 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 volute air duct is disposed between the third housing and the fourth housing, the predetermined direction is perpendicular to the axis of the volute outlet and the axis of the volute air duct, wherein the third pipe portion is integrally formed with the third housing or the fourth housing;

[0014] Alternatively, the blower housing includes a fifth housing and a sixth housing, the fifth housing and the sixth housing are connected along the axis of the volute outlet, the volute air duct is disposed between the fifth housing and the sixth housing, wherein the third pipe portion is integrally formed with the fifth housing.

[0015] In some embodiments, the air duct is integrally formed with at least a part of the blower housing, and the blade is disposed inside the air duct.

[0016] 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 axis of the volute air duct, the volute air duct is disposed between the first housing and the second housing, wherein the air duct is integrally formed with the first housing or the second housing;

[0017] 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 volute air duct is disposed between the third housing and the fourth housing, and the predetermined direction is perpendicular to the axis of the volute outlet and the axis of the volute air duct. Wherein, the air duct is integrally formed with the third housing or the fourth housing;

[0018] Alternatively, the blower housing includes a fifth housing and a sixth housing, the fifth housing and the sixth housing are connected along the axis of the volute outlet, the volute air duct is disposed between the fifth housing and the sixth housing. Wherein, the air duct is integrally formed with the fifth housing.

[0019] In some embodiments, the blower housing is configured as a high-temperature resistant housing; and / or, the air duct is configured as a high-temperature resistant housing.

[0020] In some embodiments, the blower housing is configured as a plastic housing or a resin housing; and / or, the air duct is configured as a plastic housing or a resin housing.

[0021] In some embodiments, the blower housing is configured as a BMC housing; and / or, the air duct is configured as a BMC housing.

[0022] 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 blower assembly, the blade is in a 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 blower assembly, the blade is in a second position and closes the air duct.

[0023] In some embodiments, the anti-freezing device further includes:

[0024] A seat body, the seat body is connected to the air duct, and the seat body is provided with an air outlet;

[0025] 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.

[0026] In some embodiments, the seat body includes an annular rib and a strip rib. The annular rib is disposed inside the air duct and along the circumferential wall of the air duct. Two ends of the strip rib are respectively connected to opposite sides of the annular rib. The strip rib divides a first air outlet and a second air outlet in 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.

[0027] In some embodiments, the rotating shaft is opposite to the strip-shaped rib along the axis of the air duct; and / or, a relief groove is provided on the outer peripheral surface of the annular rib, and the end of the rotating shaft penetrates through the annular rib and is located in the relief groove; and / or, a first flanging portion is provided along the outer periphery 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 along the inner periphery of the first air outlet and the inner periphery of the second air outlet, and the blade is supported on the second flanging at the second position; and / or, the seat body further includes a retaining rib configured to limit the rotation angles of the first sub-blade and the second sub-blade.

[0028] In some embodiments, the air duct extends in the up-down direction and is connected to the blower housing at the lower end. When the air pressure in the volute air duct is not higher than the external air pressure of the blower assembly, the blade is supported on the seat body.

[0029] In some embodiments, the blower assembly further includes an air inlet duct that communicates with the volute air duct.

[0030] 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 axis of the volute air duct. The volute air duct is provided between the first housing and the second housing, and the air inlet duct is provided in the first housing;

[0031] Or, 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 volute air duct and the air inlet duct are provided between the third housing and the fourth housing, and the predetermined direction is perpendicular to the axis of the volute outlet and the axis of the volute air duct;

[0032] Or, the blower housing includes a fifth housing and a sixth housing. The fifth housing and the sixth housing are connected along the axis of the volute outlet. The volute air duct and the air inlet duct are provided between the fifth housing and the sixth housing.

[0033] The gas water heater according to an embodiment of the present invention includes: the aforementioned blower assembly; a combustion chamber connected to the blower assembly and communicating with the inlet of the volute air duct.

[0034] In some embodiments, the blower housing includes a smoke collecting hood. An air inlet duct is configured in the smoke collecting hood. The air inlet duct communicates with the volute air duct and covers the upper part of the combustion chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a schematic diagram of a blower assembly according to an embodiment of the present invention.

[0036] Figure 2 It is a cross-sectional view of a fan assembly according to an embodiment of the present utility model.

[0037] Figure 3 It is an exploded view of a fan assembly according to an embodiment of the present utility model.

[0038] Figure 4 It is a three-dimensional schematic diagram of a fan assembly according to an embodiment of the present utility model.

[0039] Figure 5 It is a three-dimensional schematic diagram of a fan assembly according to another embodiment of the present utility model.

[0040] Figure 6 It is a three-dimensional schematic diagram of a fan assembly according to still another embodiment of the present utility model.

[0041] Figure 7 It is a schematic diagram of an anti-freezing device of a fan assembly according to an embodiment of the present utility model.

[0042] Figure 8 It 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 utility model.

[0043] Figure 9 It is a schematic diagram of a seat body of an anti-freezing device of a fan assembly according to an embodiment of the present utility model.

[0044] Figure 10 It is a schematic diagram of a gas water heater according to an embodiment of the present utility model.

[0045] 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, first pipe portion 511, second pipe portion 512, third pipe portion 513, fourth pipe portion 514, 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 portion 504, second flanging portion 505, rotating shaft 54, gas water heater 1000, combustion chamber 200. Detailed implementation manners

[0046] To prevent the reverse flow of cold air from freezing the gas water heater and causing it to fail to start, in related technologies, a fan assembly with an anti-freezing device is provided. The anti-freezing device generally includes an air duct and blades. The air duct is connected to the volute, and the blades are arranged in the air duct to open and close the air duct. In related technologies, the air duct and the volute are usually set as a split structure. After the air duct and the volute are formed separately, they are assembled together. This will affect the structural strength of the fan housing. At the same time, there will be gaps at the connection between the air duct and the volute, resulting in the leakage of flue gas from the connection between the volute and the air duct, affecting the use of the gas water heater. In addition, due to the separate formation of the air duct and the volute, there will be processing errors in both the air duct and the volute. These processing errors stack up when the air duct and the volute are assembled together, which may make it difficult to assemble the volute and the air duct together, affecting the yield rate of the fan assembly. Moreover, due to the separate formation and assembly of the air duct and the volute, the strength at the connection between the air duct and the volute is relatively weak, affecting the connection strength and stability of the fan assembly and the service life of the fan assembly.

[0047] For this reason, the present utility model provides a fan assembly in which at least a part of the air duct and the volute are integrally formed. The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present utility model and should not be construed as limiting the present utility model.

[0048] As Figures 1 to 3 , the fan assembly 100 according to an embodiment of the present utility model includes a fan housing 10. 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 arranged between the volute inlet 1011 and the volute outlet 1012.

[0049] 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 101 is sent out from the volute outlet 1012, it can be sent out of the fan assembly 100 through the anti-freezing device 50; while the air flow outside the fan assembly 100 is difficult to flow back into the fan assembly 100 through the anti-freezing device 50.

[0050] In addition, the fan assembly 100 further includes an impeller device 30 and a motor device 40. The impeller device 30 is disposed in the volute air duct 101 and 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 drive the air flow. 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.

[0051] According to the fan assembly 100 of the embodiment of the present invention, an anti-freezing device 50 is provided, and the anti-freezing device 50 is connected to the volute air duct 101 through an 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 the blade 52 is opened to discharge the flue gas; when the external air flows back along the air duct 51, the blade 52 will block the air flow from flowing back, so as to avoid the discharged flue gas and the like from flowing back to 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 to the fan assembly 100, so as to achieve the anti-freezing of the fan assembly 100 and the gas water heater 1000 having the fan assembly 100.

[0052] Optionally, referring to the attached Figures 1 to 3 In the present invention, the fan assembly 100 may have a front-back direction, an up-down direction, and a left-right direction that are perpendicular to each other. Among them, the fan assembly 100 has an air inlet duct 102 and a volute air duct 101. The air inlet duct 102 communicates with the volute air duct 101. The air flow can enter the volute air duct 101 through the air inlet duct 102, and after passing through the volute air duct 101, it is sent out from the volute outlet 1012. Among them, one end plate of the volute air 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 communicates with the volute inlet 1011. Of course, in the present invention, the orientation is mainly described according to the drawings, which is not a limitation on the protection scope of the present invention. The technical solutions obtained by adjusting the direction according to the solution of the present invention are still within the protection scope of the present invention, such as swapping the left-right direction in the drawings.

[0053] Combined with the attached Figure 1 and Figure 2, the axis of the volute air duct 101 is arranged to be inclined in the direction from the lower left to the upper right, the inlet axis of the air inlet air duct 102 is parallel to the up and down direction, and the outlet axis of the air duct 51 is parallel to the up and down direction. Among them, the air flow can enter the air inlet air duct 102 along the direction from bottom to top through the inlet of the air inlet air duct 102; under the guiding or collecting action of the air inlet air duct 102, it enters the volute air duct 101 through the volute inlet 1011; then it enters the anti-freezing device 50 through the volute outlet 1012 of the volute air duct 101, and finally is sent out from the anti-freezing device 50. The whole process is smooth, with less air resistance, and can effectively improve the energy efficiency of the fan assembly 100.

[0054] Optionally, a flanging structure is provided on the periphery of the volute inlet 1011. The flanging structure is configured to extend obliquely along the direction from the air inlet air duct 102 to the volute air duct 101, which can facilitate the connection between the air inlet air duct 102 and the volute air duct 101, and connect the volute air duct 101 with the air inlet air duct 102 through this inlet, facilitating smoke exhaust. In addition, the flanging structure can form a guiding structure to guide the smoke, further reduce the air resistance at the volute inlet 1011, and further gather 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.

[0055] Optionally, in some embodiments, at least a part of the air duct 51 is integrally formed with the fan housing 10. Through the integral structure of the air duct 51 and the fan housing 10, problems such as weak structural strength or stress concentration at the connection between the air duct 51 and the fan housing 10 can be avoided, the connection strength between the air duct 51 and the fan housing 10 can be improved, and thus the service life of the fan assembly can be improved. Moreover, since at least a part of the air duct 51 and the fan housing 10 are integrally formed, problems such as the difficulty in assembling the air duct 51 and the fan housing 10 caused by the cumulative error at the connection between the air duct 51 and the fan housing 10 can be avoided or reduced, thereby improving the yield rate and assembly efficiency of the fan assembly.

[0056] It should also be noted that by the integral molding method, the possibility of gaps appearing at the connection can be avoided or reduced, and the leakage of smoke from the connection between the air duct 51 and the fan housing 10 can be avoided.

[0057] In the related art, the air duct and the fan housing adopt a split structure. In this way, it is necessary to separately manufacture the air duct and the fan housing, resulting in relatively complex processes. For example, the air duct is set to include two half pipes, and the fan housing is set to include two parts. During the processing of the fan assembly in the related art, at least four parts need to be separately manufactured and then assembled together, and the assembly is relatively complex. When any one of the two half pipes and the fan housing are integrally formed, at least one part of the processing technology can be reduced. For example, when the two half pipes are integrally formed with the two parts of the fan housing respectively, only two parts need to be manufactured and assembled together, which simplifies the processing technology of the fan assembly 100 and improves the production efficiency of the fan assembly 100.

[0058] In the related art, the volute is formed by sheet metal forming. It is difficult to form a complex shape by sheet metal forming. Therefore, it is difficult to set the volute in the related art to be an integral structure with the air duct. The inventor of the present invention has made a breakthrough by setting the fan housing and the air duct to be made of BMC, resin or high-temperature resistant plastic, etc., which can more easily form a relatively complex shape. Therefore, the fan housing in the present invention is more easily formed into a complex shape, and at least a part of the air duct is set to be integral with the fan housing.

[0059] Among them, the fitting structure between the air duct 51 and the fan housing 10 in the present invention includes but is not limited to the following embodiments.

[0060] Embodiment 1

[0061] Such as Figure 3 , the air duct 51 includes a first pipe portion 511 and a second pipe portion 512 that are connected along the radial direction. The first pipe portion 511 and the second pipe portion 512 enclose the air duct 51, and the blade 52 is arranged between the first pipe portion 511 and the second pipe portion 512. During the assembly process, the blade 52 can be arranged between the first pipe portion 511 and the second pipe portion 512. After the first pipe portion 511 and the second pipe portion 512 are assembled together, the blade 52 will be positioned between the first pipe portion 511 and the second pipe portion 512, thereby realizing the stable assembly of the anti-freezing device 50.

[0062] Optionally, the first pipe portion 511 is integrally formed with at least a part of the fan housing 10; and / or, the second pipe portion 512 is integrally formed with at least a part of the fan housing 10.

[0063] Example 1, such as Figure 3 and Figure 4 , 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 axis of the volute air duct 101, and the volute air duct 101 is arranged between the first housing 111 and the second housing 112.

[0064] Optionally, the first housing 111 includes a first sub-housing and a third sub-housing, 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. 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, the fourth sub-housing is connected to the second side plate, and the third sub-housing and the fourth sub-housing are connected to construct the volute outlet 1012.

[0065] In addition, the blower 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, and the third side plate is configured as a smoke collecting hood 117. The inner side of the smoke collecting hood 117 constructs the air inlet duct 102, and the third side plate may be connected to the first end plate. The third side plate may be provided in a cylindrical shape, a square cylindrical shape, a triangular cylindrical shape or other shapes. During the assembly process of the blower 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. In this setting form, the installation efficiency of the impeller can be improved.

[0066] 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 blower 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 blower 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.

[0067] 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. Additionally, as described above, 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, making it convenient for the first housing 111 and the second housing 112 to be plastic-molded, thereby effectively reducing the cost of the fan assembly 100 and improving the molding efficiency of the fan assembly 100.

[0068] 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 respectively formed by die-casting through injection molding. 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, simplifying the process flow and reducing the processing cost.

[0069] 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 semi-dry manufacturing of glass fiber-reinforced thermosetting products. 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.

[0070] In addition, at least one of the first housing 111 and the second housing 112 can also be made of metal material.

[0071] 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 glued form, and the above connection method is relatively simple and convenient to operate.

[0072] Among them, the first pipe portion 511 is integrally formed with the first housing 111, and the second pipe portion 512 can be set to be separated from and connected to the first housing 111, the second housing 112, and the first pipe portion 511; or, the second pipe portion 512 is integrally formed with the second housing 112, and the first pipe portion 511 can be set to be separated from and connected to the first housing 111, the second housing 112, and the second pipe portion 512; or, the first pipe portion 511 is integrally formed with the first housing 111, and the second pipe portion 512 is integrally formed with the second housing 112.

[0073] Example 2, such as Figure 5 , 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 volute air duct 101 is disposed between the third housing 113 and the fourth housing 114. The predetermined direction is perpendicular to the axis of the volute outlet 1012 and the axis of the volute air duct 101.

[0074] Optionally, the third housing 113 includes a fifth sub-housing and a seventh sub-housing, and the fourth housing 114 includes a sixth sub-housing and an eighth sub-housing. The volute air duct 101 is disposed between the fifth sub-housing and the sixth sub-housing, and the volute outlet 1012 is disposed between the seventh sub-housing and the eighth sub-housing. 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, and 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 to form a flat plate, the fourth end plate and the sixth end plate are connected to form a flat plate, and the fourth side plate and the fifth side plate are connected to form a surrounding plate. 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, and the seventh sub-housing and the eighth sub-housing are connected to construct the volute outlet 1012.

[0075] In addition, the fan housing 10 is further provided with an air inlet duct 102. A volute inlet 1011 is constructed 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 may be connected to the third end plate, the seventh side plate may be connected to the fifth end plate, and the sixth side plate and the seventh side plate may be constructed into 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 provided 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. The volute air duct 101 is formed by splicing the third housing 113 and the fourth housing 114, which can facilitate the installation of the impeller. Moreover, the cooperation of the fourth end plate and the sixth end plate can be used to support the impeller. Through this setting form, the installation efficiency of the impeller can be improved.

[0076] 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 it can also ensure that the third housing 113 has higher structural strength and sealing effect, thereby improving the service life and energy efficiency of the fan 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 of an integrally formed structure, 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 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.

[0077] 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 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 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, facilitate plastic molding of the third housing 113 and the fourth housing 114, thereby effectively reducing the cost of the fan assembly 100 and improving the molding efficiency of the fan assembly 100.

[0078] Among them, the third housing 113 and the fourth housing 114 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 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.

[0079] In addition, at least one of the third housing 113 and the fourth housing 114 in the present utility model can be configured as a BMC housing in cooperation. 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.

[0080] In addition, at least one of the third housing 113 and the fourth housing 114 can also be made of metal material.

[0081] In addition, a connecting member is connected between the third outer shell 113 and the fourth outer shell 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 outer shell 113 and the fourth outer shell 114, the connection between the third outer shell 113 and the fourth outer shell 114 is more stable, strengthening the connection stability between the third outer shell 113 and the fourth outer shell 114, and thus the sealing effect of the connection between the third outer shell 113 and the fourth outer shell 114 is better. The third outer shell 113 and the fourth outer shell 114 can also be adhesively connected.

[0082] Among them, the first pipe portion 511 is integrally formed with the third outer shell 113, and the second pipe portion 512 can be set to be separated from and connected to the third outer shell 113, the fourth outer shell 114, and the first pipe portion 511; or, the second pipe portion 512 is integrally formed with the fourth outer shell 114, and the first pipe portion 511 can be set to be separated from and connected to the third outer shell 113, the fourth outer shell 114, and the second pipe portion 512; or, the first pipe portion 511 is integrally formed with the third outer shell 113, and the second pipe portion 512 is integrally formed with the fourth outer shell 114.

[0083] Example 3: The fan housing 10 includes a fifth outer shell 115 and a sixth outer shell 116. The fifth outer shell 115 and the sixth outer shell 116 are connected along the axis of the volute outlet 1012, and the volute air duct 101 is provided between the fifth outer shell 115 and the sixth outer shell 116.

[0084] Optionally, the fifth outer shell 115 includes a ninth sub-shell and a tenth sub-shell. The volute air duct 101 is provided between the ninth sub-shell and the sixth outer shell 116, and the tenth sub-shell surrounds the volute outlet 1012. The ninth sub-shell can include a seventh end plate, an eighth end plate, and an eighth side plate. The sixth outer shell 116 can 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, 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, the eighth side plate and the ninth side plate are connected into a surrounding plate shape, and the volute air duct 101 is formed between 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.

[0085] In addition, the fan housing 10 is further provided with an air inlet duct 102. A volute inlet 1011 is formed between the seventh end plate and the ninth end plate. The fifth housing 115 further includes a tenth side plate, and the sixth housing 116 further includes an eleventh side plate. The tenth side plate can be connected to the seventh end plate, and the eleventh side plate can be connected to the ninth end plate. The tenth side plate and the eleventh side plate can be configured to form a smoke collecting hood 117. The air inlet duct 102 is formed inside the smoke collecting hood 117. The smoke collecting hood 117 can be cylindrical, square tube-shaped, triangular tube-shaped or other shapes. During the assembly process of the fan assembly 100, the impeller can be installed in the volute air duct 101. The volute air duct 101 is formed by splicing the fifth housing 115 and the sixth housing 116, which facilitates the installation of the impeller. Moreover, the cooperation between the eighth end plate and the tenth end plate can be used to support the impeller. Through this setting form, the installation efficiency of the impeller can be improved.

[0086] In some embodiments of the present utility model, the fifth housing 115 is configured to be integrally formed. By integrally forming, the processing efficiency of the fifth housing 115 can be improved, the processing cost of the fifth housing 115 can be reduced, and the fifth housing 115 can also be ensured to have higher structural strength and sealing effect, thereby improving the service life and energy efficiency of the fan assembly 100. In addition, the sixth housing 116 can also be configured to be integrally formed. When both the fifth housing 115 and the sixth housing 116 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 fifth housing 115 and the sixth housing 116 caused by thermal expansion and contraction of the fifth housing 115 and the sixth housing 116 can be avoided.

[0087] 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, in the present utility model, the air duct structure is constructed by connecting the fifth housing 115 and the sixth housing 116 in the front-rear direction, which can simplify the structures of the fifth housing 115 and the sixth housing 116, make the fifth housing 115 and the sixth housing 116 convenient for plastic molding, thereby effectively reducing the cost of the fan assembly 100 and improving the molding efficiency of the fan assembly 100.

[0088] 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 a water heater. For example, the fifth housing 115 and the sixth housing 116 can be respectively formed by die casting through injection molding. After molding, the 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.

[0089] In addition, at least one of the fifth housing 115 and the sixth housing 116 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 overheat and melt.

[0090] In addition, at least one of the fifth housing 115 and the sixth housing 116 can also be made of a metal material.

[0091] 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 adhesively connected.

[0092] Among them, one of the first pipe portion 511 and the second pipe portion 512 is integrally formed with the fifth housing 115, and the other can be set to be separated from and connected to the first housing 111 and the second housing 112. Of course, both the first pipe portion 511 and the second pipe portion 512 can also be integrally formed with the fifth housing 115.

[0093] Example 4: A first groove portion is provided on the inner side surface of the first pipe portion 511, and a second groove portion is provided on the inner circumferential surface of the second pipe portion 512. The first groove portion and the second groove portion enclose and form a positioning groove arranged along the circumferential direction of the air duct 51. The seat body 53 of the antifreeze device 50 can be embedded into the first groove portion and the second groove portion to realize the stable assembly of the seat body 53 and the air duct 51. In addition, the seat body 53 and the air duct 51 can also be connected by means of adhesion, welding, bolt connection, interference fit, etc.

[0094] Embodiment 2

[0095] Such as Figure 6 , the air duct 51 includes a third pipe portion 513 and a fourth pipe portion 514 connected along the axis. The third pipe portion 513 is integrally formed with at least a part of the fan housing 10. Optionally, the blade 52 can be provided on the third pipe portion 513. The blade 52 can also be provided on the fourth pipe portion 514. The blade 52 can also be provided between the third pipe portion 513 and the fourth pipe portion 514.

[0096] Example 1. 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 axis of the volute air duct 101. The volute air duct 101 is arranged between the first housing 111 and the second housing 112. Among them, the third pipe portion 513 is integrally formed with the first housing 111; or the third pipe portion 513 is integrally formed with the second housing 112. For the assembly and structure of the first housing 111 and the second housing 112, reference can be made to Embodiment 1.

[0097] Example 2. 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 volute air duct 101 is arranged between the third housing 113 and the fourth housing 114. The predetermined direction is perpendicular to the axis of the volute outlet 1012 and the axis of the volute air duct 101. Among them, the third pipe portion 513 is integrally formed with the third housing 113; or the third pipe portion 513 is integrally formed with the fourth housing 114. For the assembly and structure of the third housing 113 and the fourth housing 114, reference can be made to Embodiment 1.

[0098] Example 3. As Figure 6 , 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 axis of the volute outlet 1012. The volute air duct 101 is arranged between the fifth housing 115 and the sixth housing 116. Among them, the third pipe portion 513 is integrally formed with the fifth housing 115. For the assembly and structure of the fifth housing 115 and the sixth housing 116, reference can be made to Embodiment 1.

[0099] Embodiment 3

[0100] The air duct 51 is integrally formed with at least a part of the fan housing 10, and the blade 52 is arranged inside the air duct 51.

[0101] Example 1. 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 axis of the volute air duct 101. The volute air duct 101 is arranged between the first housing 111 and the second housing 112. Among them, the air duct 51 is integrally formed with the first housing 111; or the air duct 51 is integrally formed with the second housing 112. For the assembly and structure of the first housing 111 and the second housing 112, reference can be made to Embodiment 1.

[0102] Example 2. 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 volute air duct 101 is disposed between the third housing 113 and the fourth housing 114. The predetermined direction is perpendicular to the axis of the volute outlet 1012 and the axis of the volute air duct 101. Among them, the air duct 51 is integrally formed with the third housing 113; or the air duct 51 is integrally formed with the fourth housing 114. For the assembly and structure of the third housing 113 and the fourth housing 114, reference may be made to Embodiment 1.

[0103] Example 3. 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 axis of the volute outlet 1012. The volute air duct 101 is disposed between the fifth housing 115 and the sixth housing 116. Among them, the air duct 51 is integrally formed with the fifth housing 115. For the assembly and structure of the fifth housing 115 and the sixth housing 116, reference may be made to Embodiment 1.

[0104] In addition, the integral molding in the foregoing embodiments may be integral plastic molding, such as integral injection molding, integral thermoforming, etc. By integrally molding plastic parts, the molding 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.

[0105] In some embodiments, the fan housing 10 and / or the air duct 51 may be configured as a high-temperature resistant housing. It can be installed in the special environment of a water heater. In addition, the fan housing 10 and / or the air duct 51 may also be made of 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 and / or the air duct 51 may also be a BMC housing. BMC is essentially a molding intermediate material for semi-dry manufacturing of glass fiber reinforced thermosetting products. 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.

[0106] Of course, the fan housing 10 and / or the air duct 51 of the present utility model may also be configured as other forms of housings. For example, the fan housing 10 may also be configured as a resin housing.

[0107] 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, rotational resistance, etc. of the blade 52.

[0108] As Figures 7 to 9 , 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 air inlets. 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 inlet in the first position and closes the air inlet in the second position. Among them, the blade 52 can be set to be rotatably connected to the rotating shaft 54; it is also possible to make the blade 52 and the rotating shaft 54 relatively stationary and rotatably connect the rotating shaft 54 to the seat body 53. This can facilitate the opening and closing of the blade 52 for the air duct 51, simplify the structure of the anti-freezing device 50, and improve the stability of the anti-freezing device 50.

[0109] Optionally, as Figure 8 and Figure 9 , 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 circumferential 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 inlet 501 and the second air inlet 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 inlet 501, and the second sub-blade 522 is connected to the rotating shaft 54 and is rotatable to open and close the second air inlet 502. Using the annular rib 531 and the strip-shaped rib 532 to form the first air inlet 501 and the second air inlet 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.

[0110] Among them, the rotating shaft 54 and the strip-shaped rib 532 are opposite along the axis of the air duct 51. By using the shielding of the strip-shaped rib 532, 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 can be avoided, and the anti-freezing effect and structural stability of the anti-freezing device 50 can be improved.

[0111] Optionally, as Figure 8 and Figure 9, 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.

[0112] Optionally, as Figure 9 , 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 periphery of the first air outlet 501 and the inner periphery of the second air outlet 502. The blade 52 is supported on the second flanging in the second position. It 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 recess, and the first recess can be embedded into the first air outlet 501; the second sub-blade 522 is provided with a second recess, and the second recess can be embedded into the second air outlet 502.

[0113] 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 continuous rotation of the first sub-blade 521 to prevent the first sub-blade 521 from rotating too large an angle 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 continuous rotation of the second sub-blade 522 to prevent the second sub-blade 522 from rotating too large an angle and being unable to return to the closed position. Optionally, the retaining rib 533 is provided above the rotating shaft 54; or the retaining rib 533 is provided above the strip-shaped rib 532. Optionally, the rotation angles of the first sub-blade 521 and the second sub-blade 522 are not greater than °; or when the first sub-blade 521 and the second sub-blade 522 contact the retaining rib 533, during the rotation of the first sub-blade 521 and the second sub-blade 522, the angle with the horizontal plane is maintained at less than 90°.

[0114] In some embodiments, the air duct 51 extends in the up and down direction, and the 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. It is convenient for smoke exhaust and can reduce the possibility of air flow backflow.

[0115] As Figure 10, the gas water heater 1000 according to the embodiments of the present utility model includes: the aforementioned fan assembly 100 and the combustion chamber 200. The combustion chamber 200 is connected to the fan assembly 100 and is communicated 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 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 utility model is small and it is easy to be formed, which can improve the production efficiency of the fan assembly 100 while ensuring the flue gas circulation.

[0116] 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.

[0117] 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 is communicated with the volute air duct 101, and the air inlet duct 102 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.

[0118] In the description of the present utility model, 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 utility model 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. Therefore, it should not be construed as a limitation to the present utility model.

[0119] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0120] In the present utility model, unless otherwise clearly specified or limited, terms such as "installation", "connection", "attachment", "fixation", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the internal communication between two components or the interaction relationship between two components, 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.

[0121] In the present utility model, unless otherwise clearly specified or 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 in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean 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.

[0122] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means 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 a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0123] 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 fan housing (10), the fan 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 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 fan housing (10) and communicating with the volute outlet (1012), at least a part of the air duct (51) being integrally formed with the fan housing (10), 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 fan assembly (100) according to claim 1, wherein, The air duct (51) comprises a first pipe portion (511) and a second pipe portion (512) connected in the radial direction, the first pipe portion (511) and the second pipe portion (512) enclosing the air duct (51), and the blades (52) being disposed between the first pipe portion (511) and the second pipe portion (512). Wherein, the first pipe portion (511) is integrally formed with at least a part of the fan housing (10); and / or, the second pipe portion (512) is integrally formed with at least a part of the fan housing (10).

3. The blower assembly (100) according to claim 2, characterized in that, The fan 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 axis of the volute air duct (101), the volute air duct (101) being disposed between the first housing (111) and the second housing (112), wherein, the first pipe portion (511) is integrally formed with the first housing (111); and / or, the second pipe portion (512) is integrally formed with the second housing (112); Or, the fan 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 volute air duct (101) being disposed between the third housing (113) and the fourth housing (114), the predetermined direction being perpendicular to the axis of the volute outlet (1012) and the axis of the volute air duct (101), wherein, the first pipe portion (511) is integrally formed with the third housing (113); and / or, the second pipe portion (512) is integrally formed with the fourth housing (114); Or, the fan 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 axis of the volute outlet (1012), the volute air duct (101) being disposed between the fifth housing (115) and the sixth housing (116), wherein, one of the first pipe portion (511) and the second pipe portion (512) is integrally formed with the fifth housing (115).

4. The fan assembly (100) according to claim 1, characterized in that, The air duct (51) includes a third pipe portion (513) and a fourth pipe portion (514) connected along an axis. The third pipe portion (513) is integrally formed with at least a part of the fan housing (10). The blade (52) is disposed in the third pipe portion (513), in the fourth pipe portion (514), or between the third pipe portion (513) and the fourth pipe portion (514). Wherein, 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 axis of the volute air duct (101). The volute air duct (101) is disposed between the first housing (111) and the second housing (112). Wherein, the third pipe portion (513) is integrally formed with the first housing (111) or the second housing (112); or, 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 volute air duct (101) is disposed between the third housing (113) and the fourth housing (114). The predetermined direction is perpendicular to the axis of the volute outlet (1012) and the axis of the volute air duct (101). Wherein, the third pipe portion (513) is integrally formed with the third housing (113) or the fourth housing (114); or, 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 axis of the volute outlet (1012). The volute air duct (101) is disposed between the fifth housing (115) and the sixth housing (116). Wherein, the third pipe portion (513) is integrally formed with the fifth housing (115).

5. The fan assembly (100) according to claim 1, wherein, The air duct (51) is integrally formed with at least a part of the fan housing (10). The blade (52) is disposed in the air duct (51). Or, 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 axis of the volute air duct (101). The volute air duct (101) is disposed between the first housing (111) and the second housing (112). Wherein, the air duct (51) is integrally formed with the first housing (111) or the second housing (112). Alternatively, 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, the volute air duct (101) is disposed between the third housing (113) and the fourth housing (114), and the predetermined direction is perpendicular to the axis of the volute outlet (1012) and the axis of the volute air duct (101). Wherein, the air duct (51) is integrally formed with the third housing (113) or the fourth housing (114); Alternatively, 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 of the volute outlet (1012), and the volute air duct (101) is disposed between the fifth housing (115) and the sixth housing (116). Wherein, the air duct (51) is integrally formed with the fifth housing (115).

6. The blower assembly (100) according to claim 1, characterized in that, The blower housing (10) is configured as a high-temperature resistant housing; and / or, the air duct (51) is configured as a high-temperature resistant housing.

7. The fan assembly (100) according to claim 1, wherein, The blower housing (10) is configured as a plastic housing or a resin housing; and / or, the air duct (51) is configured as a plastic housing or a resin housing.

8. The fan assembly (100) according to claim 1, characterized in that, The blower housing (10) is configured as a BMC housing; and / or, the air duct (51) is configured as a BMC housing.

9. The fan assembly (100) according to any one of claims 1-8, 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 blower assembly (100), the blade (52) is located at 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 blower assembly (100), the blade (52) is located at the second position and closes the air duct (51).

10. The fan assembly (100) according to any one of claims 1-8, 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), and the blade (52) opens the air outlet at the first position and closes the air outlet at the second position; Among them, the seat body (53) includes an annular rib (531) and a strip rib (532). The annular rib (531) is arranged inside the air duct (51) and along the circumferential wall of the air duct (51). The two ends of the strip rib (532) are respectively connected to the opposite sides of the annular rib (531). The strip rib (532) divides a first air outlet (501) and a second air outlet (502) inside 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 can rotate to open and close the first air outlet (501). The second sub-blade (522) is connected to the rotating shaft (54) and can rotate to open and close the second air outlet (502).

11. The blower assembly (100) according to claim 10, characterized in that, The rotating shaft (54) is opposite to the strip 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). 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). The first flanging portion (504) is sleeved on the inner side surface of the air duct (51); and / or, second flangings are provided along the inner peripheries of the first air outlet (501) and the second air outlet (502). The blade (52) is supported on the second flanging in the second position; and / or, the seat body (53) further includes a retaining rib (533). The retaining rib (533) is configured to limit the rotation angles of the first sub-blade (521) and the second sub-blade (522).

12. The fan assembly (100) according to claim 10, characterized in that, The air duct (51) extends in the up and down direction and is connected to the fan 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 fan assembly (100), the blade (52) is supported on the seat body (53).

13. The fan assembly (100) according to any one of claims 1-8, characterized in that, The fan assembly (100) is further provided with an air inlet duct (102). The air inlet duct (102) is communicated with the volute air duct (101). Among them, 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 of the volute air duct (101), the volute air duct (101) is disposed between the first housing (111) and the second housing (112), and the air inlet duct (102) is disposed 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, the volute air duct (101) and the air inlet duct (102) are disposed between the third housing (113) and the fourth housing (114), and the predetermined direction is perpendicular to the axis of the volute outlet (1012) and the axis of the volute air duct (101); 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 of the volute outlet (1012), and the volute air duct (101) and the air inlet duct (102) are disposed between the fifth housing (115) and the sixth housing (116).

14. A gas water heater (1000), characterized in that, Comprising: The blower assembly (100) according to any one of claims 1-13; A 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); Among them, 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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