Fan and gas water heater

Abstract

The utility model belongs to the technical field of draught fans, and particularly discloses a draught fan and a gas water heater, the draught fan comprises a volute and a flow guide ring, one end of the volute is provided with a first air inlet, the side wall of the volute is provided with an air outlet, the first air inlet and the air outlet are both communicated with a containing cavity, and the flow guide ring is detachably connected to the end, provided with the first air inlet, of the volute. The flow guide ring is provided with a through second air inlet, the second air inlet communicates with the first air inlet, the wall face of the first air inlet comprises a first arc face connected to the end face of one end of the volute, and the wall face of the second air inlet comprises a second arc face connected to the surface of the side, away from the volute, of the flow guide ring. And the curvature radius of the second cambered surface is greater than that of the first cambered surface, so that the static pressure at the second air inlet is higher.

Description

Technical Field

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

[0002] To prevent incomplete combustion of gas in gas water heaters, which can produce harmful carbon monoxide, a fan is usually installed inside the water heater casing to continuously extract the high-temperature flue gas from inside the casing or to transport air from outside the casing to the inside, ensuring good air circulation between the inside and outside of the casing and providing sufficient oxygen inside.

[0003] When a fan is operating, the higher the static pressure at the air inlet, the stronger the suction force that draws air in. This reduces the likelihood of backflow at the air inlet, resulting in higher fan efficiency and less vibration at the air inlet, thus reducing noise during operation. Furthermore, the size of the air inlet varies depending on the fan's exhaust or blower flow rate, maximizing the static pressure at the inlet.

[0004] However, different gas water heaters usually have different requirements for the exhaust and blower flow rates of the fan. Therefore, when the same fan is used in different gas water heaters, the static pressure at the fan inlet will be different due to the different operating conditions. Consequently, the noise and efficiency of the same fan will vary greatly when used in different gas water heaters.

[0005] Therefore, in related technologies, a detachable guide ring is usually set up near the first air inlet of the fan. The guide ring has a second air inlet connected to the first air inlet, so that the second air inlet on the guide ring forms the air inlet of the fan, thereby achieving the effect of reducing and adjusting the diameter of the air inlet of the fan.

[0006] However, the smaller the air inlet, the more significant the obstruction effect of the air inlet edge on the fluid flowing into the air inlet. The current design of the air inlet edge has a large obstruction effect on the fluid. After adjusting the diameter of the air inlet of the fan by reducing the diameter of the air inlet through the guide ring, the effect on increasing the static pressure at the air inlet is small, and there is still a lot of room for improvement. Utility Model Content

[0007] One of the technical problems solved by this utility model is to provide a fan that can effectively solve the problem that the guide ring has a small effect on increasing the static pressure at the air inlet, so as to further increase the static pressure at the air inlet of the fan.

[0008] The second technical problem solved by this utility model is to provide a gas water heater that can effectively solve the problem of low working efficiency of the fan, thereby improving the combustion efficiency of the gas water heater.

[0009] The first technical problem mentioned above is solved by the following technical solution:

[0010] A fan, comprising:

[0011] The volute has a receiving cavity, a first air inlet is provided at one end of the volute, and an air outlet is provided on the side wall of the volute. The first air inlet and the air outlet are both connected to the receiving cavity.

[0012] A guide ring is detachably connected to one end of the volute where the first air inlet is located. The guide ring has a through second air inlet, which is connected to the first air inlet.

[0013] The wall of the first air inlet includes a first arc surface connected to one end face of the volute, and the wall of the second air inlet includes a second arc surface connected to the side surface of the guide ring away from the volute. The radius of curvature of the second arc surface is greater than the radius of curvature of the first arc surface.

[0014] The fan described in this utility model has the following advantages compared with the prior art:

[0015] The air guide ring directs airflow through the second arc surface, making the process of air entering the second air inlet smoother. By making the radius of curvature of the second arc surface greater than that of the first arc surface, the surface of the second arc surface can be made smoother, thus making the Coanda effect of the fluid more significant. In other words, the second arc surface has a stronger guiding effect on air entering the second air inlet.

[0016] In one embodiment, the radius of curvature of the first arc surface is R1, and the radius of curvature of the second arc surface is R2, where 1.5R1≤R2≤2.3R1.

[0017] In one embodiment, the minimum diameter of the first air inlet is D1, the minimum diameter of the second air inlet is D2, and 0.52≤D2 / D1≤0.96.

[0018] In one embodiment, the central angle of the second arc surface is θ, where 45°≤θ≤90°.

[0019] In one embodiment, the air outlet of the first air inlet is flush with the air outlet of the second air inlet.

[0020] In one embodiment, the volute includes a housing portion and a first base portion. The housing portion has the receiving cavity, and one end of the housing portion is provided with the first air inlet. The side wall of the housing portion is provided with the air outlet. The first base portion is located in the receiving cavity, and one end of the first base portion is connected to the other end of the housing portion. The guide ring is detachably connected to the end of the housing portion provided with the first air inlet.

[0021] In one embodiment, an impeller is further included, which is rotatably disposed within the receiving cavity; along the relative directions of the two ends of the volute, the distance between the air outlet end of the second air inlet and the impeller is h, and the distance h satisfies: 1.75mm≤h≤5mm.

[0022] In one embodiment, the impeller includes a plurality of blades and a support plate, the plurality of blades being arranged at intervals around the central axis of the first air inlet, and the support plate being connected to all the blades.

[0023] In one embodiment, the blades are connected to both opposite sides of the support plate along the opposite directions of the two ends of the volute.

[0024] The second technical problem mentioned above is solved by the following technical solution:

[0025] A gas water heater includes: a water heater housing and a fan as described above.

[0026] The gas water heater described in this utility model has the following advantages compared with the prior art:

[0027] The air guide ring directs airflow through the second arc surface, making the process of air entering the second air inlet smoother. By making the radius of curvature of the second arc surface greater than that of the first arc surface, the surface of the second arc surface can be made smoother, thus making the Coanda effect of the fluid more significant. In other words, the second arc surface has a stronger guiding effect on air entering the second air inlet. Attached Figure Description

[0028] Figure 1 This is a structural cross-sectional view of the fan provided in an embodiment of the present utility model;

[0029] Figure 2 for Figure 1 Enlarged view of point M in the middle;

[0030] Figure 3 An exploded three-dimensional structural diagram of the fan provided in an embodiment of this utility model;

[0031] Figure 4This is a cross-sectional view of the first part and the guide ring provided in an embodiment of the present utility model;

[0032] Label Explanation:

[0033] 1. Fan;

[0034] 10. Volute; 100. Receiving cavity; 101. First air inlet; 102. Air outlet; 103. First arc surface; 104. Housing part; 1041. First section; 1042. Second section; 105. First base part; 1050. Shaft hole;

[0035] 11. Stator;

[0036] 12. Impeller; 120. Second base section; 121. Fan blade structure; 1210. Blade; 1211. Support plate;

[0037] 13. Rotor;

[0038] 14. Air guide ring; 140. Second air inlet; 141. Second curved surface;

[0039] 15. Shaft. Detailed Implementation

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] like Figures 1 to 3 As shown, this embodiment provides a fan 1, including a volute 10, an impeller 12, a motor, and a guide ring 14. The volute 10 has a receiving cavity 100, a first air inlet 101 at one end of the volute 10, and an air outlet 102 on the side wall of the volute 10. Both the first air inlet 101 and the air outlet 102 are connected to the receiving cavity 100. The impeller 12 is rotatably disposed within the receiving cavity 100. The motor is connected to the volute 10 and the impeller 12, and the motor can drive the impeller 12 to rotate relative to the volute 10. The guide ring 14 is detachably connected to the volute 10 and has a first air inlet. At one end of the inlet 101, the guide ring 14 has a through second air inlet 140, which is connected to the first air inlet 101. The minimum diameter of the second air inlet 140 is smaller than that of the first air inlet 101. The wall of the first air inlet 101 includes a first arc surface 103 connected to the end face of one end of the volute 10. The wall of the second air inlet 140 includes a second arc surface 141 connected to the side surface of the guide ring 14 away from the volute 10. The radius of curvature of the second arc surface 141 is larger than that of the first arc surface 103.

[0045] By providing a detachable guide ring 14 at one end of the volute 10 where the first air inlet 101 is located, the second air inlet 140 of the guide ring 14 is formed as the air inlet of the fan 1. Thus, by adjusting the size of the second air inlet 140 of the guide ring 14, the size of the air inlet of the fan 1 can be adjusted. When the fan 1 achieves the predetermined exhaust and blower flow rate during operation, the static pressure near the air inlet can be increased, resulting in lower noise and higher efficiency of the fan 1, thereby expanding the applicability of the fan 1.

[0046] Furthermore, since the minimum diameter of the second air inlet 140 is smaller than that of the first air inlet 101, a larger proportion of the air entering the second air inlet 140 will be obstructed by the volute 10 at the edge of the second air inlet 140. Therefore, it is more necessary to guide the airflow through the second arc surface 141 to make the process of air entering the second air inlet 140 smoother. By making the radius of curvature of the second arc surface 141 larger than that of the first arc surface 103, the arc of the surface of the second arc surface 141 can be made smoother, so that the Coanda effect of the second arc surface 141 on the fluid is more significant. In other words, the guiding effect of the second arc surface 141 on the air entering the second air inlet 140 is stronger.

[0047] In one embodiment, the motor may include a stator 11 and a rotor 13. The stator 11 is disposed on the volute 10. The impeller 12 is at least partially rotatably sleeved on the outer periphery of the stator 11. The rotor 13 is disposed on the impeller 12 and 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 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 fan 1 during operation.

[0048] The radius of curvature of the first arc surface 103 is R1, and the radius of curvature of the second arc surface 141 is R2. The larger the radius of curvature R2 of the second arc surface 141 is than the radius of curvature R1 of the first arc surface 103, the stronger the air-guiding effect of the second arc surface 141. However, the second arc surface 141 occupies a larger installation space. Therefore, the radius of curvature R2 of the second arc surface 141 cannot be too large. Based on this, in one embodiment, the radius of curvature R2 of the second arc surface 141 and the radius of curvature R1 of the first arc surface 103 can satisfy: 1.5R1≤R2≤2.3R1. For example, the radius of curvature R2 of the second arc surface 141 can be 1.5R1, 1.6R1, 1.7R1, 1.8R1, 1.9R1, 2R1, 2.1R1, 2.2R1, or 2.3R1, etc.

[0049] Please combine Figure 4As shown, the minimum diameter of the first air inlet 101 is D1, and the minimum diameter of the second air inlet 140 is D2. The smaller the minimum diameter D2 of the second air inlet 140 is compared to the minimum diameter D1 of the first air inlet 101, the greater the static pressure near the second air inlet 140 when the fan 1 is working. However, the smaller the maximum airflow that can be achieved through the second air inlet 140 is. Therefore, the minimum diameter D2 of the second air inlet 140 cannot be too small. Based on this, in one embodiment... The ratio of the minimum diameter D2 of the second air inlet 140 to the minimum diameter D1 of the first air inlet 101 can satisfy: 0.52≤D2 / D1≤0.96. For example, the ratio D2 / D1 of the minimum diameter D2 of the second air inlet 140 to the minimum diameter D1 of the first air inlet 101 can be 0.52, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.92, 0.95 or 0.96, etc.

[0050] The central angle of the second arc surface 141 is θ. Since the air entering the second air inlet 140 needs to turn by a maximum of 90° at the edge of the second air inlet 140, the closer the central angle θ of the second arc surface 141 is to 90°, the better. However, since the radius of curvature of the second arc surface 141 is large, there may be a situation where the space on the guide ring 14 is insufficient to accommodate the second arc surface 141 with a central angle θ of 90°. Based on this, in one embodiment, the central angle θ of the second arc surface 141 can satisfy: 45°≤θ≤90°. For example, the central angle θ of the second arc surface 141 can be 45°, 50°, 55°, 60°, 65°, 70°, 75°, 80°, 85° or 90°, etc.

[0051] In other embodiments, since the radius of curvature of the first arc surface 103 is small, the space for the first arc surface 103 in the volute 10 is usually sufficient, and the central angle of the first arc surface 103 can be equal to 90°.

[0052] In one embodiment, the air outlet of the first air inlet 101 is flush with the air outlet of the second air inlet 140, so that after the air is guided into the receiving cavity 100 by the guide ring 14 and the volute 10, the air is more easily diffused radially along the impeller 12 to flow towards the impeller 12.

[0053] In one embodiment, the volute 10 includes a housing portion 104 and a first base portion 105. The housing portion 104 has a receiving cavity 100, and one end of the housing portion 104 is provided with a first air inlet 101. The side wall of the housing portion 104 is provided with an air outlet 102. The first base portion 105 is located in the receiving cavity 100, and one end of the first base portion 105 is connected to the other end of the housing portion 104. The stator 11 is embedded in the first base portion 105. The guide ring 14 is detachably connected to the end of the housing portion 104 where the first air inlet 101 is provided, so that the first base portion 105 and the stator 11 can be formed as a whole, so that the connection stability between the stator 11 and the first base portion 105 is better, and there is no need to assemble the stator 11 and the first base portion 105, which simplifies the assembly steps of the fan 1.

[0054] Specifically, the stator 11 can be embedded in the first base portion 105 by injection molding the first base portion 105 onto the outside of the stator 11.

[0055] Furthermore, the first base portion 105 can also be integrally molded with at least a portion of the housing portion 104 by injection molding, thereby improving the connection stability between the first base portion 105 and the housing portion 104 and further simplifying the assembly steps of the fan 1.

[0056] In one embodiment, the housing portion 104 may include a first portion 1041 and a second portion 1042 opposite to each other at its two opposite ends. The first portion 1041 and the second portion 1042 are separately provided and detachably connected. The first portion 1041 is provided with a first air inlet 101, and the second portion 1042 is connected to the first base portion 105, so that the receiving cavity 100 can be exposed by detaching the first portion 1041 and the second portion 1042, so as to install the impeller 12 on the first base portion 105.

[0057] When, as described in the aforementioned technical solution, the first base portion 105 is integrally formed with at least a portion of the housing portion 104 by injection molding, specifically, the first base portion 105 can be integrally formed with the second portion 1042 by injection molding.

[0058] Along the relative directions at both ends of the volute 10, the distance between the outlet end of the second air inlet 140 and the impeller 12 is h. The distance h usually needs to be small so that the gap formed between the outlet end of the second air inlet 140 and the impeller 12 is small, thereby reducing the total amount of air flowing into the gap formed between the outlet end of the second air inlet 140 and the impeller 12, thus improving the utilization rate of the impeller 12 and improving the efficiency of the fan 1. However, if the distance h is too small, it will cause the guide ring 14 to easily interfere with the impeller 12. Based on this, in one embodiment, the distance h can satisfy: 1.75mm≤h≤5mm. For example, the distance h can be 1.75mm, 2mm, 2.25mm, 2.5mm, 2.75mm, 3mm, 3.25mm, 3.5mm, 3.75mm, 4mm, 4.25mm, 4.5mm, 4.75mm or 5mm, etc.

[0059] In one embodiment, the impeller 12 includes a second base portion 120 and a fan blade structure 121. The second base portion 120 is disposed within the receiving cavity 100 and is at least partially rotatably sleeved on the outer periphery of the stator 11. The fan blade structure 121 is arranged around the outer periphery of the second base portion 120. The rotor 13 is embedded in the second base portion 120, thereby enabling the second base portion 120 and the rotor 13 to form an integral whole, so that the connection stability between the rotor 13 and the second base portion 120 is better, and there is no need to assemble the rotor 13 with the second base portion 120, which simplifies the assembly steps of the dual fans 1.

[0060] Specifically, the rotor 13 can be embedded in the second base portion 120 by injection molding the second base portion 120 onto the outside of the rotor 13.

[0061] Furthermore, the second base portion 120 can also be integrally molded with the fan blade structure 121 by injection molding, thereby improving the connection stability between the second base portion 120 and the fan blade structure 121 and further simplifying the assembly steps of the fan 1.

[0062] At this point, the distance h mentioned above is the distance between the air outlet of the second air inlet 140 and the fan blade structure 121.

[0063] In one embodiment, the first base portion 105 is further provided with a shaft hole 1050, the shaft hole 1050 and the stator 11 share a central axis, and the fan 1 also includes a rotating shaft 15, one end of the rotating shaft 15 is embedded in the second base portion 120, and the other end of the rotating shaft 15 is rotatably connected to the shaft hole 1050 through a bearing (not shown in the figure), so that the rotating shaft 15 can cooperate with the shaft hole 1050 to further limit the stability of the position of the rotating shaft 15 of the first base portion 105 relative to the second base portion 120, thereby further reducing the vibration generated by the second base when the fan 1 is working, so as to further reduce the noise generated by the fan 1 when it is working.

[0064] In one embodiment, the wind turbine structure 121 includes a plurality of blades 1210 and a support plate 1211. All blades 1210 are spaced apart from the second base portion 120, and the plurality of blades 1210 are arranged at intervals around the second base portion 120. The support plate 1211 is connected to all blades 1210 and the outer periphery of the second base portion 120, so that the support plate 1211 can support the plurality of blades 1210 and keep the relative position of the plurality of blades 1210 and the second base portion 120 stable.

[0065] In one embodiment, blades 1210 are connected to both opposite sides of the support plate 1211 along the opposite directions of the two ends of the volute 10, so that the length of a single blade 1210 can be shorter, thereby the support plate 1211 provides better support and fixation for the blade 1210 as a whole, which can reduce the degree of vibration of the blade 1210 during operation, and further reduce the noise generated by the fan 1 during operation.

[0066] In other embodiments, all blades 1210 may be evenly distributed on the side of the support plate 1211 facing the first air inlet 101.

[0067] This embodiment also provides a gas water heater, including: a water heater shell and a fan 1 as described in the foregoing technical solution. Since the fan 1 can be replaced with different guide rings 14 to make itself have a larger static pressure at the air inlet when applied to different gas water heaters, the gas water heater can reduce the overall design and manufacturing cost of the gas water heater while producing less noise and having higher working efficiency.

[0068] 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.

[0069] 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 fan, characterized in that, include: A volute (10) has a receiving cavity (100). One end of the volute (10) is provided with a first air inlet (101), and the side wall of the volute (10) is provided with an air outlet (102). The first air inlet (101) and the air outlet (102) are both connected to the receiving cavity (100). A guide ring (14) is detachably connected to one end of the volute (10) where the first air inlet (101) is located. The guide ring (14) has a through second air inlet (140) which is connected to the first air inlet (101). The wall of the first air inlet (101) includes a first arc surface (103) connected to one end face of the volute (10), and the wall of the second air inlet (140) includes a second arc surface (141) connected to the side surface of the guide ring (14) away from the volute (10). The radius of curvature of the second arc surface (141) is greater than the radius of curvature of the first arc surface (103).

2. The fan according to claim 1, characterized in that, The radius of curvature of the first arc surface (103) is R1, and the radius of curvature of the second arc surface (141) is R2, where 1.5R1≤R2≤2.3R1.

3. The fan according to claim 1, characterized in that, The minimum diameter of the first air inlet (101) is D1, and the minimum diameter of the second air inlet (140) is D2, where 0.52≤D2 / D1≤0.

96.

4. The fan according to claim 1, characterized in that, The central angle of the second arc surface (141) is θ, 45°≤θ≤90°.

5. The fan according to any one of claims 1-4, characterized in that, The air outlet of the first air inlet (101) is flush with the air outlet of the second air inlet (140).

6. The fan according to any one of claims 1-4, characterized in that, The volute (10) includes a housing part (104) and a first base part (105). The housing part (104) has the receiving cavity (100), and one end of the housing part (104) is provided with the first air inlet (101). The side wall of the housing part (104) is provided with the air outlet (102). The first base part (105) is located in the receiving cavity (100), and one end of the first base part (105) is connected to the other end of the housing part (104). The guide ring (14) is detachably connected to the end of the housing part (104) provided with the first air inlet (101).

7. The fan according to any one of claims 1-4, characterized in that, It also includes an impeller (12), which is rotatably disposed in the receiving cavity (100); along the relative directions of the two ends of the volute (10), the distance between the air outlet end of the second air inlet (140) and the impeller (12) is h, and the distance h satisfies: 1.75mm≤h≤5mm.

8. The fan according to claim 7, characterized in that, The impeller (12) includes multiple blades (1210) and a support plate (1211). The multiple blades (1210) are arranged at intervals around the central axis of the first air inlet (101), and the support plate (1211) is connected to all the blades (1210).

9. The fan according to claim 8, characterized in that, Along the opposite directions at both ends of the volute (10), the blades (1210) are connected to both opposite sides of the support plate (1211).

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

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