Double-air-inlet type fan and gas water heater

Abstract

The utility model belongs to the technical field of draught fans, and particularly discloses a double-air-inlet type draught fan and a gas water heater, the double-air-inlet type draught fan comprises a volute, an impeller and a motor, the volute comprises a shell part and a first base part, two opposite ends of the shell part are provided with a first air inlet and a second air inlet respectively, and the first air inlet and the second air inlet are communicated with each other. One end of the first base part is connected to the end, provided with the second air inlet, of the shell part, the other end of the first base part is located in the containing cavity, the partition plate of the impeller is rotatably arranged in the containing cavity of the volute, and all the first fan blades are arranged on the side, close to the first air inlet, of the partition plate. All the second fan blades are arranged on the side, close to the second air inlet, of the partition plate, the motor can drive the partition plate to rotate relative to the first base part, the opening area of the first air inlet is larger than that of the second air inlet, the height of the first fan blades is larger than that of the second fan blades, and the double-air-inlet type draught fan is low in noise and high in efficiency.

Description

Technical Field

[0001] This utility model relates to the field of fan technology, and in particular to a dual-inlet fan and a gas water heater. Background Technology

[0002] In order to supply sufficient oxygen to the inside of the gas water heater and avoid incomplete combustion of gas inside the gas water heater, which would produce carbon monoxide that is harmful to the human body, a dual-intake fan is usually installed in the gas water heater to continuously supply outside air to the inside of the gas water heater.

[0003] In related technologies, in order to improve the efficiency of the fan, a double-inlet fan is provided with air inlets at both ends of the fan casing along the axial direction. Since the motor is connected to one end of the casing, the air intake areas of the two air inlets are different sizes. Current double-inlet fans usually use single-blade impellers, which can improve efficiency compared to single-inlet fans, but cannot ensure that both air inlets have good air intake effects. Therefore, there is still room for improvement. Utility Model Content

[0004] One of the technical problems solved by this utility model is to provide a dual-inlet fan, which can effectively solve the problem of low air intake efficiency of dual-inlet fans.

[0005] The second technical problem solved by this utility model is to provide a gas water heater that can effectively solve the problem of low air intake efficiency of the dual-intake fan in gas water heaters.

[0006] The first technical problem mentioned above is solved by the following technical solution:

[0007] A dual-inlet fan, comprising:

[0008] The volute has a receiving cavity. The volute has a first air inlet and a second air inlet at two opposite ends along its own axis. The side wall of the volute has an air outlet. The first air inlet, the second air inlet and the air outlet are all connected to the receiving cavity. The opening area of ​​the first air inlet is larger than the opening area of ​​the second air inlet.

[0009] An impeller, disposed within the receiving cavity, includes a partition plate, a plurality of first fan blades, and a plurality of second fan blades. The plurality of first fan blades are disposed on the side of the partition plate near the first air inlet, and the plurality of second fan blades are disposed on the side of the partition plate near the second air inlet. Along the axial direction of the volute, the height of the first fan blades is greater than the height of the second fan blades.

[0010] A motor is connected to one end of the volute where the second air inlet is located, and the motor is used to drive the impeller to rotate.

[0011] The dual-inlet fan of this utility model has the following advantages compared with the prior art:

[0012] Because the opening area of ​​the second air inlet is smaller than that of the first air inlet, the height of the first fan blade is greater than that of the second fan blade along the axial direction of the housing. This allows the first fan blade to be suitable for pushing a larger flow of air, while the second fan blade is suitable for pushing a smaller flow of air. On the one hand, this makes the air-pushing efficiency of both the first and second fan blades higher, thus improving the overall efficiency of the dual-inlet fan. On the other hand, it makes the airflow velocity at the first and second air inlets more balanced, preventing the airflow velocity at one of the air inlets from being too high, thereby helping to reduce the noise generated by the dual-inlet fan during operation.

[0013] In one embodiment, the opening area of ​​the first air inlet is S1, the opening area of ​​the second air inlet is S2, and along the axial direction of the volute, the height of the first fan blade is h1, and the height of the second fan blade is h2. And 0.8≤k≤1.2.

[0014] In one embodiment, the ratio of the opening area S1 of the first air inlet to the opening area S2 of the second air inlet satisfies: 2≤S1 / S2≤4.

[0015] In one embodiment, the cross-sectional shape of the first fan blade cut by a plane perpendicular to the axial direction of the volute is the same as the cross-sectional shape of the second fan blade cut by a plane perpendicular to the axial direction of the volute.

[0016] In one embodiment, the impeller includes an equal number of first blades and a equal number of second blades, and the plurality of first blades are equidistantly arranged around the rotation axis of the partition, and the plurality of second blades are equidistantly arranged around the rotation axis of the partition.

[0017] In one embodiment, on the same plane perpendicular to the axial direction of the volute, the projections of a plurality of first blades and a plurality of second blades are aligned.

[0018] In one embodiment, the first fan blade is at least partially located on the outer periphery of the first air inlet; and / or,

[0019] The second fan blade is at least partially located on the outer periphery of the second air inlet.

[0020] In one embodiment, the second air inlet includes a plurality of sub-air inlets, which are distributed circumferentially around the volute.

[0021] In one embodiment, the plurality of said sub-inlets are arranged at equal intervals.

[0022] The second technical problem mentioned above is solved by the following technical solution:

[0023] A gas water heater, including a water heater housing and a dual-intake fan as described above.

[0024] The gas water heater described in this utility model has the following advantages compared with the prior art:

[0025] By using the highly efficient dual-intake fan mentioned above, when the exhaust function of the dual-intake fan can meet the design requirements of the gas water heater, a smaller dual-intake fan can be selected due to its higher efficiency. In other words, the space required for the dual-intake fan within the water heater casing can be reduced, which helps to achieve a more compact design for the gas water heater. Attached Figure Description

[0026] Figure 1 A schematic diagram of the structure of a dual-inlet fan (viewed from the angle of the first air inlet) provided in an embodiment of this utility model;

[0027] Figure 2 A schematic diagram of the structure of a dual-inlet fan (viewed from the angle of the second inlet) provided in an embodiment of this utility model;

[0028] Figure 3 for Figure 2 A cross-sectional view of the dual-inlet fan (protective cover omitted) along the AA direction;

[0029] Figure 4 for Figure 3 A cross-sectional view of the impeller, rotor, and shaft.

[0030] Figure 5 for Figure 3 A cross-sectional view of the volute and stator in the middle;

[0031] Label Explanation:

[0032] 1. Dual-inlet fan;

[0033] 10. Volute; 10a. Receiving cavity; 101. First air inlet; 102. Second air inlet; 102a. Sub-air inlet; 103. Air outlet; 104. Supporting rib structure;

[0034] 11. Stator;

[0035] 12. Impeller; 120. Second base; 121. Baffle; 122. First fan blade; 123. Second fan blade;

[0036] 13. Rotor;

[0037] 14. Shaft;

[0038] 15. Bearings;

[0039] 16. Protective cover;

[0040] 17. First base portion; 170. Shaft hole; 171. Receiving groove. Detailed Implementation

[0041] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0042] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0043] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0044] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0045] like Figures 1 to 3As shown, this embodiment provides a dual-inlet fan 1, including a volute 10, a stator 11, and a motor. The volute 10 has a receiving cavity 10a. A first air inlet 101 and a second air inlet 102 are respectively provided at two opposite ends along its axial direction. An air outlet 103 is provided on the side wall of the volute 10. The first air inlet 101, the second air inlet 102, and the air outlet 103 are all connected to the receiving cavity 10a. The opening area of ​​the first air inlet 101 is larger than the opening area of ​​the second air inlet 102. An impeller 12 is provided... Within the receiving cavity 100a, the impeller 12 includes a partition 121, a plurality of first fan blades 122, and a plurality of second fan blades 123. The plurality of first fan blades 122 are located on the side of the partition 121 near the first air inlet 101, and the plurality of second fan blades 123 are located on the side of the partition 121 near the second air inlet 102. Along the axial direction of the volute 10, the height of the first fan blades 122 is greater than the height of the second fan blades 123. A motor is connected to the end of the volute 10 where the second air inlet 102 is located, and the motor is used to drive the impeller 12 to rotate.

[0046] Since the motor occupies part of the space at the end of the second air inlet 102 in the volute 10, the opening area of ​​the second air inlet 102 is smaller than the opening area of ​​the first air inlet 101. Therefore, by making the height of the first fan blade 122 greater than the height of the second fan blade 123 along the axial direction of the volute 10, the first fan blade 122 is suitable for pushing a larger flow of air, and the second fan blade 123 is suitable for pushing a smaller flow of air. On the one hand, this can make the airflow velocity at the first air inlet 101 and the second air inlet 102 more balanced, so as to avoid the airflow velocity at one of the air inlets being too fast, thereby helping to reduce the noise generated by the dual-inlet fan 1 during operation. On the other hand, it can make the air-pushing efficiency of the first fan blade 122 and the second fan blade 123 both higher, so that the overall efficiency of the dual-inlet fan 1 is higher.

[0047] In addition, by providing a first air inlet 101 and a second air inlet 102 at the two opposite ends of the volute 10, the total opening area of ​​the air inlet is increased, so that the airflow velocity at the first air inlet 101 and the second air inlet 102 is slower, thereby effectively reducing the noise generated when the dual-inlet fan 1 is in use.

[0048] Furthermore, by setting a first fan blade 122 on the side of the partition 121 near the first air inlet 101 and a second fan blade 123 on the side of the partition 121 near the second air inlet 102, the first fan blade 122 can push the air entering the receiving cavity 10a from the first air inlet 101, and the second fan blade 123 can push the air entering the receiving cavity 10a from the second air inlet 102. Thus, the first fan blade 122 and the second fan blade 123 are both close to the corresponding air inlets, which can improve the efficiency of the dual-inlet fan 1.

[0049] In one embodiment, the motor includes a stator 11 and a rotor 13. The stator 11 is disposed in the volute 10, and the rotor 13 is disposed in the partition 121. The rotor 13 is rotatably sleeved on the outer periphery of the stator 11. By sleeved on the outer periphery of the stator 11, the rotor 13 can have a larger moment of inertia, which is beneficial to enable the impeller 12 to achieve stable rotation speed. This can reduce the vibration caused by the unstable speed of the impeller 12, and further reduce the noise generated by the dual-inlet fan 1 during operation.

[0050] In one embodiment, the motor may further include a first base portion 17, one end of which is connected to the end of the volute 10 where the second air inlet 102 is provided. The stator 11 is disposed on the first base portion 17, and the second air inlet 102 is located on the outer periphery of the first base portion 17. This allows the first base portion 17 to provide a larger connectable surface for the stator 11, thereby making the relative position of the stator 11 and the volute 10 more stable. In other words, it makes the structure of the dual-inlet fan 1 more stable.

[0051] In one embodiment, the other end of the first base portion 17 may be located within the receiving cavity 10a, thereby making the structure of the dual-inlet fan 1 more compact and smaller.

[0052] In one embodiment, the stator 11 is at least partially embedded in the first base portion 17, so that the first base portion 17 and the stator 11 form an integral whole. This can improve the connection stability between the stator 11 and the first base portion 17, and eliminate the need to assemble the stator 11 and the first base portion 17, thus simplifying the assembly steps of the dual-inlet fan 1.

[0053] Specifically, the stator 11 can be at least partially embedded in the first base portion 17 by injection molding the first base portion 17 onto the outside of the stator 11.

[0054] Please combine Figure 4 As shown, along the axial direction of the volute 10, the height of the first fan blade 122 is h1, the height of the second fan blade 123 is h2, the opening area of ​​the first air inlet 101 is S1, and the opening area of ​​the second air inlet 102 is S2. It can be understood that when the air-driving capacity per unit height of the first fan blade 122 and the second fan blade 123 is approximately the same, the closer the height ratio of the first fan blade 122 to the second fan blade 123 is to the opening area ratio of the first air inlet 101 to the second air inlet 102, the more balanced the air-driving efficiency of the first fan blade 122 and the second fan blade 123 during operation, and the more balanced the airflow velocity at the first air inlet 101 and the second air inlet 102. Based on this, in one embodiment, the height ratio h1 / h2 of the first fan blade 122 to the second fan blade 123 and the opening area ratio S1 / S2 of the first air inlet 101 to the second air inlet 102 can satisfy the following: And 0.8≤k≤1.2, for example, k can be 0.8, 0.85, 0.9, 0.95, 1, 1.05, 1.1, 1.15 or 1.2, etc.

[0055] The smaller the ratio of the opening area S1 of the first air inlet 101 to the opening area S2 of the second air inlet 102, the closer the opening area of ​​the second air inlet 102 is to the opening area S1 of the first air inlet 101. Consequently, the available space for the first base portion 17 at the end of the volute 10 is smaller, and the smaller the structure of the volute 10 used to support the first base portion 17, the more difficult it is to stably support the first base portion 17. Conversely, the larger the ratio of the opening area S1 of the first air inlet 101 to the opening area S2 of the second air inlet 102, the smaller the opening area of ​​the second air inlet 102. This is achieved by designing... The effect of increasing the total air inlet opening area of ​​the dual-inlet fan 1 by placing the second air inlet 102 is smaller. Therefore, the ratio of the opening area S1 of the first air inlet 101 to the opening area S2 of the second air inlet 102 should not be too large or too small. Based on this, in one embodiment, the ratio of the opening area S1 of the first air inlet 101 to the opening area S2 of the second air inlet 102 can satisfy: 2≤S1 / S2≤4. For example, S1 / S2 can be 2, 2.2, 2.4, 2.5, 2.6, 2.8, 3, 3.2, 3.4, 3.5, 3.6, 3.8 or 4, etc.

[0056] In one embodiment, the cross-sectional shape of the first blade 122 cut by a plane perpendicular to the axial direction of the volute 10 is the same as the cross-sectional shape of the second blade 123 cut by a plane perpendicular to the axial direction of the volute 10. This makes the shape of the impeller 12 simpler and easier to design, and also makes the air-driving capacity of the first blade 122 and the second blade 123 per unit height approximately the same, which simplifies the performance simulation of the first blade 122 and the second blade 123.

[0057] In one embodiment, the impeller 12 includes an equal number of first blades 122 and second blades 123, and the plurality of first blades 122 are equidistantly arranged around the rotation axis of the partition 121, and the plurality of second blades 123 are equidistantly arranged around the rotation axis of the partition 121, so that the overall air-driving capacity of the plurality of first blades 122 per unit height is approximately the same as that of the plurality of second blades 123 per unit height.

[0058] In one embodiment, the projections of multiple first blades 122 and multiple second blades 123 can be made to coincide on the same plane perpendicular to the axial direction of the volute 10. In other words, the cross-sectional shape of the first blades 122 cut by the plane perpendicular to the axial direction of the volute 10 can be the same as the cross-sectional shape of the second blades 123 cut by the plane perpendicular to the axial direction of the volute 10. At the same time, the number of first blades 122 and the number of second blades 123 included in the impeller 12 are equal, and the multiple first blades 122 are equidistantly arranged around the rotation axis of the partition 121, and the multiple second blades 123 are equidistantly arranged around the rotation axis of the partition 121. This enables the multiple first blades 122 per unit height to have the same air-driving capacity as the multiple second blades 123 per unit height.

[0059] In one embodiment, the first fan blade 122 is at least partially located on the outer periphery of the first air inlet 101, so that the side of the first fan blade 122 away from the rotation axis of the partition 121 is also located on the outer periphery of the first air inlet 101. This can prevent the air from leaking out of the receiving cavity 10a from the first air inlet 101 after the first fan blade 122 pushes the air to the side away from the rotation axis of the partition 121, thereby enabling the dual-inlet fan 1 to have higher efficiency.

[0060] In one embodiment, the second fan blade 123 is at least partially located on the outer periphery of the second air inlet 102, so that the side of the second fan blade 123 away from the rotation axis of the partition 121 is also located on the outer periphery of the second air inlet 102. This can prevent the air from leaking out of the receiving cavity 10a from the second air inlet 102 after the second fan blade 123 pushes the air to the side away from the rotation axis of the partition 121, thereby enabling the dual-inlet fan 1 to have higher efficiency.

[0061] Preferably, the first fan blade 122 is at least partially located on the outer periphery of the first air inlet 101, and the second fan blade 123 is at least partially located on the side of the second air inlet 102 away from the first base portion 17, so that there is less backflowing air at both the first air inlet 101 and the second air inlet 102 of the dual-inlet fan 1, and the efficiency of the dual-inlet fan 1 is higher.

[0062] In one embodiment, the impeller 12 may further include a second base portion 120, which is disposed within the receiving cavity 10a and is at least partially rotatably sleeved on the outer periphery of the first base portion 17. A partition plate 121 is disposed around the outer periphery of the second base portion 120, and a plurality of first fan blades 122 are arranged at intervals around the second base portion 120. The rotor 13 is disposed on the second base portion 120 so that the rotor 13 can be connected to the partition plate 121 through the second base portion 120, and the second base portion 120 can provide more connectable surfaces for the rotor 13, thereby effectively increasing the effective connection area between the rotor 13 and the impeller 12 and improving the relative positional stability between the rotor 13 and the partition plate 121.

[0063] In one embodiment, all the first blades 122 are spaced apart from the second base portion 120, thereby reducing the obstruction of airflow by the second base portion 120 during the airflow to the first blades 122, thereby further enhancing the pushing effect of each position of the first blades 122 on the air, and further improving the efficiency of the dual-inlet fan 1.

[0064] In one embodiment, all the second blades 123 are spaced apart from the second base portion 120, thereby reducing the obstruction of airflow by the second base portion 120 during the airflow to the second blades 123, further enhancing the pushing effect of each position of the second blades 123 on the air, and further improving the efficiency of the dual-inlet fan 1.

[0065] Preferably, all the first fan blades 122 are spaced apart from the second base portion 120, and all the second fan blades 123 are spaced apart from the second base portion 120, thereby making the efficiency of the dual-inlet fan 1 higher.

[0066] In one embodiment, the rotor 13 is at least partially embedded in the second base portion 120 so that the second base portion 120 and the rotor 13 form an integral whole, which can improve the connection stability between the rotor 13 and the second base portion 120, and eliminate the need to assemble the rotor 13 and the second base portion 120, thus simplifying the assembly steps of the dual-inlet fan 1.

[0067] Specifically, the rotor 13 can be at least partially embedded in the second base portion 120 by injection molding the second base portion 120 onto the outside of the rotor 13.

[0068] Please refer to the following: Figure 2 , Figure 3 and Figure 5In one embodiment, the second air inlet 102 may include a plurality of sub-air inlets 102a, which are distributed circumferentially around the volute 10 (when the motor includes the first base portion 17, the plurality of sub-air inlets 102a are distributed around the first base portion 17). This allows the sub-air inlets 102a to be distributed more evenly, so that each of the second fan blades 123 surrounding the second base portion 120 can achieve a more efficient air-driving effect. On the other hand, it allows the portion of the volute 10 between two adjacent sub-air inlets 102a to be formed as a support rib structure 104, so that the support rib structure 104 can provide a more balanced and stable support for the motor.

[0069] It is understandable that the sum of the opening areas of all the sub-inlets 102a is equal to the opening area S2 of the aforementioned second inlet 102.

[0070] In one embodiment, multiple sub-air inlets 102a are arranged at equal intervals to further improve the uniformity of the distribution of the sub-air inlets 102a and further improve the balance and stability of the supporting effect of the support rib structure 104 on the second base portion 120.

[0071] In one embodiment, the end of the volute 10 with at least a second air inlet 102 can be integrally formed with the first base portion 17 by injection molding, thereby improving the connection stability between the volute 10 and the first base portion 17, and eliminating the need to assemble the volute 10 and the first base portion 17, which can further simplify the assembly steps of the dual-inlet fan 1.

[0072] In one embodiment, the volute 10 may include a first part (not labeled) and a second part (not labeled) opposite each other at its two opposite ends. The first part and the second part are separately provided and detachably connected. The first part is provided with a first air inlet 101 and the second part is provided with a second air inlet 102, so that the receiving cavity 10a can be exposed by detaching the first part and the second part, so as to install the impeller 12 on the first base portion 17.

[0073] In one embodiment, the first base portion 17 is further provided with a shaft hole 170, the shaft hole 170 and the stator 11 share a central axis, and the dual-inlet fan 1 also includes a rotating shaft 14 and a bearing 15. One end of the rotating shaft 14 is at least partially embedded in the second base portion 120, and the other end of the rotating shaft 14 is rotatably connected to the shaft hole 170 through the bearing 15. This allows the rotating shaft 14 to cooperate with the shaft hole 170, thereby further limiting the stability of the position of the rotating shaft 14 of the first base portion 17 relative to the second base portion 120, thereby further reducing the vibration generated by the second base portion 120 when the dual-inlet fan 1 is working, and further reducing the noise generated by the dual-inlet fan 1 when it is working.

[0074] In one embodiment, the first base portion 17 has a receiving groove 171 on the side surface opposite to the second base portion 120. The dual-inlet fan 1 also includes a circuit board (not shown in the figure), which is at least partially disposed in the receiving groove 171 and electrically connected to the stator 11, so that the circuit board can be received and protected by the receiving groove 171.

[0075] In one embodiment, the dual-inlet fan 1 further includes a protective cover 16, which is detachably disposed on the opening of the receiving groove 171 so as to separate the internal space of the receiving groove 171 from the external space of the second base portion 120, thereby further protecting the circuit board located in the receiving groove 171.

[0076] This embodiment also provides a gas water heater, including: a water heater casing and a dual-inlet fan 1 as described in the foregoing technical solution (see [link]). Figure 1 Since the exhaust function of the dual-intake fan 1 can meet the design requirements of the gas water heater, and since the dual-intake fan 1 has higher efficiency, a smaller dual-intake fan 1 can be selected. In other words, the space required for the dual-intake fan 1 inside the water heater casing can be smaller, which is conducive to the miniaturization of the gas water heater design.

[0077] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0078] The specific embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A dual-inlet fan, characterized in that, include: A volute (10) has a receiving cavity (10a). The volute (10) has a first air inlet (101) and a second air inlet (102) at two opposite ends along its own axial direction. The side wall of the volute (10) has an air outlet (103). The first air inlet (101), the second air inlet (102) and the air outlet (103) are all connected to the receiving cavity (10a). The opening area of ​​the first air inlet (101) is larger than the opening area of ​​the second air inlet (102). An impeller (12) is disposed within the receiving cavity (10a). The impeller (12) includes a partition (121), a plurality of first fan blades (122), and a plurality of second fan blades (123). The plurality of first fan blades (122) are disposed on the side of the partition (121) near the first air inlet (101), and the plurality of second fan blades (123) are disposed on the side of the partition (121) near the second air inlet (102). Along the axial direction of the volute (10), the height of the first fan blades (122) is greater than the height of the second fan blades (123). A motor is connected to one end of the volute (10) where the second air inlet (102) is located, and the motor is used to drive the impeller (12) to rotate.

2. The dual-inlet fan according to claim 1, characterized in that, The opening area of ​​the first air inlet (101) is S1, the opening area of ​​the second air inlet (102) is S2, and along the axial direction of the volute (10), the height of the first fan blade (122) is h1, and the height of the second fan blade (123) is h2. And 0.8≤k≤1.

2.

3. The dual-inlet fan according to claim 1, characterized in that, The ratio of the opening area S1 of the first air inlet (101) to the opening area S2 of the second air inlet (102) satisfies: 2≤S1 / S2≤4.

4. The dual-inlet fan according to claim 1, characterized in that, The cross-sectional shape of the first fan blade (122) cut by a plane perpendicular to the axial direction of the volute (10) is the same as the cross-sectional shape of the second fan blade (123) cut by a plane perpendicular to the axial direction of the volute (10).

5. The dual-inlet fan according to claim 1, characterized in that, The impeller (12) includes an equal number of first blades (122) and second blades (123), and a plurality of first blades (122) are arranged equidistantly around the rotation axis of the partition (121), and a plurality of second blades (123) are arranged equidistantly around the rotation axis of the partition (121).

6. The dual-inlet fan according to claim 1, characterized in that, On the same plane perpendicular to the axial direction of the volute (10), the projections of the plurality of first blades (122) and the plurality of second blades (123) are superimposed.

7. The dual-inlet fan according to any one of claims 1-6, characterized in that, The first fan blade (122) is at least partially located on the outer periphery of the first air inlet (101); and / or, The second fan blade (123) is at least partially located on the outer periphery of the second air inlet (102).

8. The dual-inlet fan according to any one of claims 1-6, characterized in that, The second air inlet (102) includes a plurality of sub-air inlets (102a), which are circumferentially distributed around the volute (10).

9. The dual-inlet fan according to claim 8, characterized in that, The multiple sub-inlets (102a) are arranged at equal intervals.

10. A gas-fired water heater, characterized in that, include: The water heater housing and the dual-inlet fan (1) as described in any one of claims 1-9.

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