Anti-freezing device, fan assembly and gas water heater

Abstract

The anti-freezing device is used for the gas water heater and comprises an air pipe, a base body and blades, the air pipe comprises a first pipe part and a second pipe part, the first pipe part and the second pipe part are connected to form an air outlet channel, the first pipe part and the second pipe part are matched to position the base body, and the blades are arranged on the base body. The blades are rotationally connected with the base body and used for opening and closing the air pipe, and the blades are opened in a one-way mode. According to the anti-freezing device provided by the embodiment of the utility model, the air pipe is provided with the first pipe part and the second pipe part, so that the structure and the assembly process of the anti-freezing device can be simplified, the anti-freezing device can be conveniently, quickly and stably mounted, and the structural strength and the stability of the anti-freezing device after the mounting can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of water heaters, and particularly relates to an anti-freezing device, 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 influence 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 an anti-freezing device, a fan assembly and a gas water heater.

[0004] The anti-freezing device according to an embodiment of the utility model is used for a gas water heater and includes an air duct, a seat body and blades. The air duct includes a first pipe portion and a second pipe portion. The first pipe portion and the second pipe portion are connected to form an air outlet passage. The first pipe portion and the second pipe portion cooperate to position the seat body. The blades are rotatably connected to the seat body and are used to open and close the air duct. The blades are configured to open unidirectionally.

[0005] For the anti-freezing device according to an embodiment of the utility model, by setting the air duct as the first pipe portion and the second pipe portion, the structure and assembly process of the anti-freezing device can be simplified, facilitating the quick and stable installation of the anti-freezing device, and effectively improving the structural strength and stability of the anti-freezing device after installation.

[0006] In addition, the anti-freezing device according to the above embodiment of the utility model may further have the following additional technical features:

[0007] In some embodiments, the first pipe portion and the second pipe portion are connected along the radial direction of the air duct. The air outlet passage is arranged between the first pipe portion and the second pipe portion. The seat body is positioned between the first pipe portion and the second pipe portion.

[0008] In some embodiments, a first groove portion is arranged on the inner side surface of the first pipe portion, and a second groove portion is arranged on the inner side surface of the second pipe portion. The first groove portion and the second groove portion are distributed along the circumferential direction of the air duct. A first positioning portion located in the first groove portion and the second groove portion is arranged on the peripheral edge of the seat body.

[0009] In some embodiments, the first groove portion is configured as an arc groove provided on the inner side surface of the first pipe portion, the second groove portion is configured as an arc groove provided on the inner side surface of the second pipe portion, two ends of the first groove portion are respectively opposite to two ends of the second groove portion, and the first groove portion and the second groove portion are combined to form an annular groove;

[0010] Alternatively, the first groove portion and / or the second groove portion includes one or a plurality of sub-grooves distributed along the circumferential direction of the air duct.

[0011] In some embodiments, a first convex portion is provided on the inner side surface of the first pipe portion, a second convex portion is provided on the inner side surface of the second pipe portion, the first convex portion and the second convex portion are distributed along the circumferential direction of the air duct, and a second positioning portion for cooperating with the first convex portion and the second convex portion is provided on the periphery of the seat body;

[0012] Alternatively, a third convex portion is provided on the inner side surface of the first pipe portion, a third groove portion is provided on the inner side surface of the second pipe portion, the third convex portion and the third groove portion are distributed along the circumferential direction of the air duct, and a third positioning portion for cooperating with the third convex portion and a fourth positioning portion for cooperating with the third groove portion are provided on the periphery of the seat body;

[0013] Alternatively, the seat body and the first pipe portion and / or the second pipe portion are connected, bonded or welded by fixing members.

[0014] In some embodiments, the first pipe portion and the second pipe portion are axially connected along the air duct, and the space inside the first pipe portion and the space inside the second pipe portion are combined to form the air outlet channel.

[0015] In some embodiments, a fourth groove portion is provided on the inner side surface of the first pipe portion, and at least a part of the periphery of the seat body is provided in the fourth groove portion; and / or, a fifth groove portion is provided on the inner side surface of the second pipe portion, and at least a part of the periphery of the seat body is provided in the fifth groove portion.

[0016] In some embodiments, a fourth convex portion is provided on the inner side surface of the first pipe portion, a fifth convex portion is provided on the inner side surface of the second pipe portion, and a fifth positioning portion located between the fourth convex portion and the fifth convex portion is provided on the periphery of the seat body;

[0017] Alternatively, the seat body and the first pipe portion and / or the second pipe portion are connected, bonded or welded by fixing members.

[0018] In some embodiments, the seat body includes an annular rib and a strip rib. The annular rib is disposed inside the air duct and arranged 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 inside the annular rib. The blade includes a first sub-blade and a second sub-blade. The first sub-blade is rotatably connected to the seat body and is configured to open and close the first air outlet. The second sub-blade is rotatably connected to the seat body and is configured to open and close the second air outlet.

[0019] In some embodiments, 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 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.

[0020] In some embodiments, the antifreeze device further includes a rotating shaft. The rotating shaft is connected to the seat body. The first sub-blade is connected to the rotating shaft and is rotatable around the rotating shaft to open and close the first air outlet; the second sub-blade is connected to the rotating shaft and is rotatable around the rotating shaft to open and close the second air outlet;

[0021] Wherein, the rotating shaft and the strip rib are opposite along the axis of the air duct; and / or, a relief groove is provided on the outer peripheral surface of the annular rib, and an end portion of the rotating shaft penetrates through the annular rib and is located in the relief groove.

[0022] In some embodiments, the air duct is configured as a high-temperature resistant housing.

[0023] In some embodiments, the air duct is configured as a plastic housing or a resin housing.

[0024] In some embodiments, the air duct is configured as a BMC housing.

[0025] The fan assembly according to an embodiment of the present invention 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; the aforementioned antifreeze device, the air duct is connected to the fan housing and communicates with the volute outlet.

[0026] In some embodiments, at least a part of the air duct is integrally formed with the fan housing.

[0027] In some embodiments, the fan housing is configured as a high-temperature resistant housing.

[0028] In some embodiments, the fan housing is configured as a plastic housing or a resin housing.

[0029] In some embodiments, the blower housing is configured as a BMC housing.

[0030] In some embodiments, the air duct extends in the up-down direction, and its lower end is connected to the blower housing. 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.

[0031] The gas water heater according to an embodiment of the present invention includes: the aforementioned blower assembly; a combustion chamber, which is connected to the blower assembly and communicates with the inlet of the volute air duct.

[0032] In some embodiments, the blower housing includes a smoke collecting hood, an air inlet duct is formed in the smoke collecting hood, the air inlet duct communicates with the volute air duct, and the air inlet duct covers the upper part of the combustion chamber. Description of the Drawings

[0033] Figure 1 is a schematic diagram of an anti-freezing device according to an embodiment of the present invention.

[0034] Figure 2 is an exploded schematic diagram of an anti-freezing device according to an embodiment of the present invention.

[0035] Figure 3 is an assembly schematic diagram of the seat body, the rotating shaft and the blade of an anti-freezing device according to an embodiment of the present invention.

[0036] Figure 4 is a schematic diagram of the seat body of an anti-freezing device according to an embodiment of the present invention.

[0037] Figure 5 is a schematic diagram of a blower assembly according to an embodiment of the present invention.

[0038] Figure 6 is a cross-sectional view of a blower assembly according to an embodiment of the present invention.

[0039] Figure 7 is an exploded view of a blower assembly according to an embodiment of the present invention.

[0040] Figure 8 is a schematic diagram of a gas water heater according to an embodiment of the present invention.

[0041] Reference numerals: fan assembly 100; fan housing 10; volute air duct 101; volute inlet 1011; volute outlet 1012; air inlet duct 102; 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; 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

[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 from beginning to end. 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 a limitation to the present utility model.

[0043] As Figures 1 to 4 , the anti-freezing device 50 according to the embodiment of the present utility model is used for the gas water heater 1000. The anti-freezing device 50 may include an air duct 51, a seat body 53 and a blade 52. The air duct 51 includes a first pipe portion 511 and a second pipe portion 512. The first pipe portion 511 and the first pipe portion 511 are connected to form an air outlet channel. The first pipe portion 511 and the second pipe portion 512 cooperate to position the seat body 53. The blade 52 is rotatably connected to the seat body 53 and is used to open and close the air duct 51. The blade 52 is configured to open unidirectionally. When in use, when air flow or flue gas enters from one end of the air duct 51, the blade 52 rotates to open the air duct 51 to facilitate the passage of air flow or flue gas through the air duct 51; when air flow enters from the other end of the air duct 51, the blade 52 remains in the state of closing the air duct 51, and it is difficult for air flow to pass through the air duct 51.

[0044] For the anti-freezing device 50 according to the embodiment of the present utility model, by setting the air duct 51 as the first pipe portion 511 and the second pipe portion 512, the structure and assembly process of the anti-freezing device 50 can be simplified, facilitating the quick and stable installation of the anti-freezing device 50, and effectively improving the structural strength and stability of the anti-freezing device 50 after installation.

[0045] The anti-freezing device 50 in the present utility model includes but is not limited to the following implementation manners.

[0046] Embodiment 1

[0047] As Figure 2, in some embodiments, the first pipe portion 511 and the second pipe portion 512 are connected along the radial direction of the air duct 51, the air outlet passage is disposed between the first pipe portion 511 and the second pipe portion 512, and the seat body 53 is positioned between the first pipe portion 511 and the second pipe portion 512. The first pipe portion 511 and the second pipe portion 512 enclose the air duct 51. During the assembly process, the seat body 53 can be disposed 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 seat body 53 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.

[0048] In Example 1, 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 side surface of the second pipe portion 512. The first groove portion and the second groove portion are distributed along the circumferential direction of the air duct 51. A first positioning portion located in the first groove portion and the second groove portion is provided on the peripheral edge of the seat body 53. After the seat body 53 is installed, the movement of the seat body 53 along the axial direction of the air duct 51 will be restricted by the cooperation of the first positioning portion, the first groove portion and the second groove portion, and the movement of the seat body 53 along the direction perpendicular to the axial direction of the air duct 51 is restricted by the air duct 51, thereby realizing the stable assembly between the seat body 53 and the air duct 51 and improving the structural stability of the anti-freezing device 50. Among them, the first positioning portion can be a convex structure provided on the peripheral edge of the seat body 53, or at least a part of the peripheral edge of the seat body 53 can be set as the first positioning portion.

[0049] For example, the first groove portion can be set as a continuous long strip-shaped groove extending along the circumferential direction of the air duct 51, the second groove portion can be set as a continuous long strip-shaped groove extending along the circumferential direction of the air duct 51, and the first groove portion and the second groove portion cooperate to form a ring shape. Optionally, the first groove portion is configured as an arc-shaped groove provided on the inner side surface of the first pipe portion 511, the second groove portion is configured as an arc-shaped groove provided on the inner side surface of the second pipe portion 512, the two ends of the first groove portion are respectively opposite to the two ends of the second groove portion, and the first groove portion and the second groove portion are combined into an annular groove. Among them, the seat body 53 can be set as a circle, the air duct 51 can be set as a circular pipe, the first pipe portion 511 and the second pipe portion 512 extend along the axial direction of the air duct 51 and are set as semi-circular shapes, and the first pipe portion 511 and the second pipe portion 512 are combined to form a circular pipe. Among them, the first groove portion can extend from one side edge to the other side edge along the inner side surface of the first pipe portion 511, and the second groove portion can extend from one side edge to the other side edge along the inner side surface of the second pipe portion 512. After being assembled, the seat body 53 can be positioned in the first groove portion and the second groove portion, realizing the stable cooperation between the seat body 53 and the air duct 51 and improving the stability and structural strength of the anti-freezing device 50.

[0050] For another example, the first groove portion and / or the second groove portion includes one or a plurality of sub-grooves distributed along the circumferential direction of the air duct 51. During the assembly process, the peripheral edge of the seat body 53 can be respectively engaged with the plurality of sub-grooves, so as to realize the circumferential positioning of the seat body 53 and the air duct 51 along the circumferential direction of the air duct 51, and the positioning along the axial direction of the air duct 51, further improving the stability of the matching structure and the connection strength between the air duct 51 and the seat body 53.

[0051] Example 2: The inner side surface of the first pipe portion 511 is provided with a first convex portion, the inner side surface of the second pipe portion 512 is provided with a second convex portion, the first convex portion and the second convex portion are distributed along the circumferential direction of the air duct 51, and the peripheral edge of the seat body 53 is provided with a second positioning portion that cooperates with the first convex portion and the second convex portion. Through the cooperation of the second positioning portion with the first convex portion and the second convex portion, stable assembly of the seat body 53, the first pipe portion 511, and the second pipe portion 512 can be achieved, improving the stability of the anti-freezing device 50. Among them, the second positioning portion can be a mating groove provided on the peripheral edge of the seat body 53. After assembly, the first convex portion and the second convex portion are disposed in the mating groove; the second positioning portion can also be a convex structure. After assembly, the convex structure, the first convex portion, and the second convex portion are cooperatively positioned.

[0052] Example 3: The inner side surface of the first pipe portion 511 is provided with a third convex portion, the inner side surface of the second pipe portion 512 is provided with a third groove portion, the third convex portion and the third groove portion are distributed along the circumferential direction of the air duct 51, and the peripheral edge of the seat body 53 is provided with a third positioning portion that cooperates with the third convex portion and a fourth positioning portion that cooperates with the third groove portion. Through the cooperation of the third convex portion with the third positioning portion and the cooperation of the third groove portion and the fourth positioning portion, stable assembly among the first pipe portion 511, the second pipe portion 512, and the seat body 53 can be achieved, improving the structural strength and stability of the anti-freezing device 50. Among them, different positioning methods are respectively adopted between the seat body 53 and the first pipe portion 511, and between the seat body 53 and the second pipe portion 512, which can improve the stability of the seat body 53 and can limit the circumferential movement of the seat body 53 along the air duct 51.

[0053] Example 4: The seat body 53 and the first pipe portion 511 are connected, bonded, or welded by a fixing member, and the matching method between the seat body 53 and the second pipe portion 512 can refer to any one of the foregoing Embodiments 1 to 3; or, the seat body 53 and the second pipe portion 512 are connected, bonded, or welded by a fixing member, and the matching method between the seat body 53 and the first pipe portion 511 can refer to any one of the foregoing Embodiments 1 to 3; or, the seat body 53 and the first pipe portion 511 are connected, bonded, or welded by a fixing member, and the seat body 53 and the second pipe portion 512 are connected, bonded, or welded by a fixing member.

[0054] Embodiment 2

[0055] The first pipe portion 511 and the second pipe portion 512 are connected along the axial direction of the air duct 51, and the spaces inside the first pipe portion 511 and the second pipe portion 512 are combined to form an air outlet channel. The air duct 51 can be constructed by the axially connected first pipe portion 511 and second pipe portion 512, which can improve the structural strength and stability of the air duct 51 and facilitate the assembly of the seat body 53 and the air duct 51. Among them, the assembly method of the first pipe portion 511 and the second pipe portion 512 connected axially with the seat body 53 may include but is not limited to the following implementation methods.

[0056] Example 1: A fourth groove portion may be provided on the inner side surface of the first pipe portion 511, and at least a part of the periphery of the seat body 53 is arranged in the fourth groove portion. Among them, the second pipe portion 512 may be provided with a positioning portion to abut against the seat body 53 to realize the positioning of the seat body 53, or the seat body 53 may be connected to the first pipe portion 511 by means of a connecting piece, bonding, welding, etc.

[0057] Alternatively, a fifth groove portion is provided on the inner side surface of the second pipe portion 512, and at least a part of the periphery of the seat body 53 is arranged in the fifth groove portion. Among them, the first pipe portion 511 may be provided with a positioning portion to abut against the seat body 53 to realize the positioning of the seat body 53, or the seat body 53 may be connected to the second pipe portion 512 by means of a connecting piece, bonding, welding, etc.

[0058] Alternatively, a fourth groove portion may be provided on the inner side surface of the first pipe portion 511, and a fifth groove portion is provided on the inner side surface of the second pipe portion 512. A part of the periphery of the seat body 53 is arranged in the fourth groove portion and a part is arranged in the fifth groove portion. For example, the periphery of the seat body 53 has a first part and a second part along the axial direction of the air duct 51, where the first part is arranged in the fourth groove portion and the second part is arranged in the fifth groove portion. Another example is that the periphery of the seat body 53 has a first part, a second part and a third part along the axial direction of the air duct 51, where the first part is arranged in the fourth groove portion, the second part is arranged in the fifth groove portion, and the third part is connected between the first part and the second part and is arranged between the first pipe portion 511 and the second pipe portion 512.

[0059] Example 2: A fourth convex portion is provided on the inner side surface of the first pipe portion 511, and a fifth convex portion is provided on the inner side surface of the second pipe portion 512. A fifth positioning portion located between the fourth convex portion and the fifth convex portion is provided on the periphery of the seat body 53. The fifth positioning portion can be positioned by the fourth convex portion and the fifth convex portion, so as to realize the positioning of the seat body 53 on the air duct 51.

[0060] Example 3. The seat body 53 and the first pipe portion 511 are connected, bonded or welded by a fixing member. The fitting manner between the seat body 53 and the second pipe portion 512 can refer to the aforementioned Embodiment 1 or 2; or, the seat body 53 and the second pipe portion 512 are connected, bonded or welded by a fixing member, and the fitting manner between the seat body 53 and the first pipe portion 511 can refer to the aforementioned Embodiment 1 or 2; or, the seat body 53 and the first pipe portion 511 are connected, bonded or welded by a fixing member, and the seat body 53 and the second pipe portion 512 are connected, bonded or welded by a fixing member.

[0061] In some embodiments, the blade 52 is rotatably connected to the seat body 53. In the fan assembly 100 having the anti-freezing device 50, 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 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 fan assembly 100, the blade 52 is located at 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 the opening pressure can be a value adapted to the weight, rotational resistance, etc. of the blade 52.

[0062] As Figures 1 to 4 , the anti-freezing device 50 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 at the first position and closes the air outlet at the second position. Among them, the blade 52 can be set to be rotatably connected to the rotating shaft 54; or the blade 52 and the rotating shaft 54 can be relatively stationary, and the rotating shaft 54 and the seat body 53 can be rotatably connected. It 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.

[0063] Optionally, as Figure 3 and Figure 4 , the seat body 53 includes an annular rib 531 and a strip-shaped rib 532. The annular rib 531 is arranged in 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 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 rotatably connected to the seat body 53 and is used to open and close the first air outlet 501, and the second sub-blade 522 is rotatably connected to the seat body 53 for opening and closing 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.

[0064] The first sub - blade 521 is connected to the rotating shaft and is rotatable about the rotating shaft for opening and closing the first air outlet 501; the second sub - blade 522 is connected to the rotating shaft and is rotatable about the rotating shaft for opening and closing the second air outlet 502.

[0065] Wherein, the rotating shaft 54 and the strip - shaped rib 532 are opposite to each other along the axis of the air duct 51. By using the shielding of the strip - shaped rib 532, the situation that air flows through the gap between the first sub - blade 521 and the second sub - blade 522 when the blade 52 is not opened is avoided, and the anti - freezing effect and structural stability of the anti - freezing device 50 can be improved.

[0066] Optionally, as Figure 3 and Figure 4 shown, 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 avoid 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.

[0067] Optionally, as Figure 4 shown, a first flanging part 504 is provided along the outer periphery of the annular rib 531. The first flanging part 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 on 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 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.

[0068] In addition, the seat body 53 further includes a stop rib 533 configured to limit the rotation angles of the first sub - blade 521 and the second sub - blade 522. Specifically, the stop 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 stop rib 533 will limit the continuous 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 stop rib 533 will limit the continuous 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 stop rib 533 is provided above the rotating shaft 54; or the stop rib 533 is provided above the strip 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 stop 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 ninety degrees.

[0069] In some embodiments, the air duct 51 can be configured as a high - temperature resistant housing and can be installed in the special environment of the water heater. In addition, the air duct 51 can also be 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 air duct 51 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 from to degrees Celsius. Therefore, when the housing made of BMC material is installed in the water heater, it will not overheat and melt.

[0070] Of course, the air duct 51 of the present utility model can also be set as other forms of housing. For example, the air duct 51 can also be a resin housing.

[0071] According to the fan assembly 100 of the embodiment of the present utility model, the fan housing 10 has 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.

[0072] 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. Among them, 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. The anti - freezing device 50 can be the anti - freezing device 50 described in the foregoing embodiments.

[0073] 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.

[0074] As Figures 5 to 7 , for the fan assembly 100 according to 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 realize the anti-freezing of the fan assembly 100 and the gas water heater 1000 having the fan assembly 100.

[0075] Optionally, referring to the attached Figures 5 to 7 , the fan assembly 100 of the present invention may 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 air duct 101. The air inlet duct 102 is communicated 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 is communicated 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 after 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 and the like.

[0076] Combined with the attached Figures 5 to 7, the axis of the volute air 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-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 be introduced into 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 is introduced into the volute air duct 101 through the volute inlet 1011; then it is introduced into the anti-freezing device 50 through the volute outlet 1012 of the volute air duct 101, and finally sent out from the anti-freezing device 50. The whole process is smooth and the air resistance is small, which can effectively improve the energy efficiency of the fan assembly 100.

[0077] 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 air duct 101, which can facilitate the connection between the air inlet duct 102 and the volute air duct 101, and connect the volute air duct 101 with 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 air resistance at the volute inlet 1011 and further gathering the smoke to facilitate smoke exhaust. Among them, the flanging structures cooperate to form an annular shape extending along the periphery of the volute inlet 1011.

[0078] 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, the connection strength between the air duct 51 and the fan housing 10 can be improved, the processing technology of the fan assembly 100 can be simplified, the production efficiency of the fan assembly 100 can be improved, and in addition, the air leakage at the connection between the air duct 51 and the fan housing 10 can be reduced, facilitating the smoke exhaust of the gas water heater 1000. Of course, the air duct 51 and the fan housing 10 can also be set as a split structure.

[0079] In some embodiments, the fan housing 10 can be configured as a high-temperature resistant housing and can be installed in the special environment of the 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.

[0080] 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.

[0081] 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.

[0082] In some embodiments, the air duct 51 extends in the vertical 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. This facilitates smoke exhaust and can reduce the possibility of air flow backflow.

[0083] Such as Figure 8 , according to the gas water heater 1000 of the embodiment of the present invention, including: the foregoing 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. Wherein, a burner may be provided 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 invention is small and it is easy to mold, which can improve the production efficiency of the fan assembly 100 while ensuring the flue gas circulation.

[0084] 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. The flue gas air resistance can be reduced, the smoke exhaust performance can be improved, 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 may be provided above the combustion chamber 200.

[0085] Optionally, the fan housing 10 includes a smoke collecting hood 117. An air inlet duct 102 is formed 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 combustion chamber 200. It is convenient to use the smoke collecting hood 117 to collect flue gas, realize smoke exhaust, and improve the safety and stability of the gas water heater 1000.

[0086] 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.

[0087] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed 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, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0088] In the present utility model, unless otherwise clearly specified and defined, the terms "mounted", "connected", "connected to", "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 defined. 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.

[0089] In the present utility model, unless otherwise clearly specified and defined, 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.

[0090] In the description of this specification, the descriptions referring to terms such as "one 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 expressions 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 can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0091] 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. An anti-freezing device (50) for a gas water heater (1000), characterized in that, It includes an air duct (51), a base body (53) and a blade (52). The air duct (51) includes a first pipe portion (511) and a second pipe portion (512). The first pipe portion (511) and the second pipe portion (512) are connected to form an air outlet channel. The first pipe portion (511) and the second pipe portion (512) cooperate to position the base body (53). The blade (52) is rotatably connected to the base body (53) and is used to open and close the air duct (51). The blade (52) is configured to open unidirectionally.

2. The anti-freezing device (50) according to claim 1, wherein The first pipe portion (511) and the second pipe portion (512) are connected along the radial direction of the air duct (51). The air outlet channel is arranged between the first pipe portion (511) and the second pipe portion (512). The base body (53) is positioned between the first pipe portion (511) and the second pipe portion (512).

3. The anti-freezing device (50) according to claim 2, characterized in that, 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 side surface of the second pipe portion (512). The first groove portion and the second groove portion are distributed along the circumferential direction of the air duct (51). A first positioning portion located in the first groove portion and the second groove portion is provided on the peripheral edge of the base body (53).

4. The anti-freezing device (50) according to claim 3, characterized in that, The first groove portion is configured as an arc groove provided on the inner side surface of the first pipe portion (511), and the second groove portion is configured as an arc groove provided on the inner side surface of the second pipe portion (512). The two ends of the first groove portion are respectively opposite to the two ends of the second groove portion. The first groove portion and the second groove portion are combined into an annular groove; Or, the first groove portion and / or the second groove portion includes one or a plurality of sub-grooves distributed along the circumferential direction of the air duct (51).

5. The anti-freezing device (50) according to claim 2, characterized in that, A first convex portion is provided on the inner side surface of the first pipe portion (511), and a second convex portion is provided on the inner side surface of the second pipe portion (512). The first convex portion and the second convex portion are distributed along the circumferential direction of the air duct (51). A second positioning portion that cooperates with the first convex portion and the second convex portion is provided on the peripheral edge of the base body (53); Or, a third convex portion is provided on the inner side surface of the first pipe portion (511), and a third groove portion is provided on the inner side surface of the second pipe portion (512). The third convex portion and the third groove portion are distributed along the circumferential direction of the air duct (51). A third positioning portion that cooperates with the third convex portion and a fourth positioning portion that cooperates with the third groove portion are provided on the peripheral edge of the base body (53); Or, the base body (53) is connected, bonded or welded to the first pipe portion (511) and / or the second pipe portion (512) by a fixing member.

6. The anti-freezing device (50) according to claim 1, characterized in that, The first pipe portion (511) and the second pipe portion (512) are connected along the axial direction of the air duct (51). The space inside the first pipe portion (511) and the space inside the second pipe portion (512) are combined to form the air outlet channel.

7. The anti-freezing device (50) according to claim 6, characterized in that, A fourth groove portion is provided on the inner side surface of the first pipe portion (511), and at least a part of the peripheral edge of the base body (53) is arranged in the fourth groove portion; and / or, a fifth groove portion is provided on the inner side surface of the second pipe portion (512), and at least a part of the peripheral edge of the base body (53) is arranged in the fifth groove portion.

8. The anti-freezing device (50) according to claim 6, wherein, The inner side of the first pipe portion (511) is provided with a fourth convex portion, the inner side of the second pipe portion (512) is provided with a fifth convex portion, and a fifth positioning portion located between the fourth convex portion and the fifth convex portion is provided on the periphery of the seat body (53); Alternatively, the seat body (53) and the first pipe portion (511) and / or the second pipe portion (512) are connected, bonded or welded by fixing members.

9. The anti-freezing device (50) according to claim 1, 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 opposite sides of the annular rib (531). The strip-shaped 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 rotatably connected to the seat body (53) and is used to open and close the first air outlet (501). The second sub-blade (522) is rotatably connected to the seat body (53) and is used to open and close the second air outlet (502).

10. The anti-freezing device (50) according to claim 9, characterized in that, 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, 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 on the second flangings in 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).

11. The anti-freezing device (50) according to claim 9, characterized in that, The antifreeze device (50) further includes a rotating shaft (54). The rotating shaft (54) is connected to the seat body (53). The first sub-blade (521) is connected to the rotating shaft and is rotatable around the rotating shaft to open and close the first air outlet (501); the second sub-blade (522) is connected to the rotating shaft and is rotatable around the rotating shaft to open and close the second air outlet (502); 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).

12. A fan assembly (100), characterized in that, Including: A fan housing (10). The fan housing (10) is provided with a volute air duct (101), and the volute air duct (101) has a volute inlet (1011) and a volute outlet (1012); The antifreeze device (50) according to any one of claims 1-11. The air duct (51) is connected to the fan housing (10) and communicates with the volute outlet (1012).

13. The fan assembly (100) according to claim 12, wherein, The air duct (51) is configured as a high-temperature resistant housing.

14. The fan assembly (100) according to claim 12, characterized in that, The air duct (51) is configured as a plastic housing or a resin housing.

15. The blower assembly (100) according to claim 12, characterized in that, The air duct (51) is configured as a BMC housing.

16. A gas water heater (1000), characterized in that, Comprising: The fan assembly (100) according to any one of claims 12-15; A combustion chamber (200), the combustion chamber (200) being connected to the fan assembly (100) and communicating with the inlet of the volute air duct (101).

17. The gas water heater (1000) according to claim 16, characterized in that, At least a part of the air duct (51) is integrally formed with the fan housing (10); and / or, the fan housing (10) is configured as a high-temperature resistant housing; and / or, 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); and / or, the fan 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).

18. The gas water heater (1000) according to claim 16, characterized in that, The fan housing (10) is configured as a plastic housing or a resin housing.

19. The gas water heater (1000) according to claim 16, characterized in that, The fan housing (10) is configured as a BMC housing.

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