Fan and gas water heater comprising same

Abstract

This utility model provides a fan and a gas water heater including the same. The fan includes: a volute with an installation port; an impeller located inside the volute and forming an annular structure surrounding the installation port; and a collector, an annular structure located on the installation port and coaxial with the impeller, including a fixing part and an adjusting part arranged radially. The outer ring of the fixing part is connected to the periphery of the installation port, and the outer ring of the adjusting part is connected to the inner ring of the fixing part. The inner ring of the adjusting part extends obliquely into the volute. The adjusting part is made of an elastic material, and the inner ring of the adjusting part forms an air inlet. The inner ring of the adjusting part has an axially penetrating notch that extends radially. The air inlet area changes with the fan's airflow, and the air inlet area is positively correlated with the fan's airflow. This ensures that the air inlet area and the fan match under different airflow conditions, avoiding uneven airflow from the collector and the resulting noise.

Description

Technical Field

[0001] This utility model relates to a fan and a gas water heater containing the same. Background Technology

[0002] Gas water heaters mix gas and air for combustion, releasing heat. A heat exchanger then replaces the heat released during combustion, producing hot water for the user. Current gas water heaters require air to mix with the gas for combustion, with the air supplied by a fan within the heater.

[0003] In addition to normal operating conditions, gas water heaters require exhaust gases to be discharged outdoors through a flue. When outdoor wind speeds are high (at different wind speed levels), the back pressure in the flue gradually increases. At this time, the fan will operate under low-flow conditions, as shown in the following description. Figure 1 The overall PQ curve of the fan, i.e., the curve showing the change of fan airflow with flue back pressure, is shown below: when the external wind speed is low (i.e., the flue back pressure is low), the fan operates under high flow conditions; when the external wind speed is high (i.e., the flue back pressure is high), the fan operates under low flow conditions. The airflow of the fan varies depending on the external environment.

[0004] Due to the existence of the above situations, such as Figure 2 As shown, when designing the collector 30' installed on the volute 10' of the fan 1', to ensure that the efficiency of the fan 1' is at its optimal operating point during normal operation, the collector 30' is generally designed at the normal operating point. At this time, the size of the air inlet 321' of the collector 30' is d. However, when the back pressure of the flue is large, the fan air volume is small, and the airflow intake state of the collector is as follows: Figure 3 As shown, at this time, the airflow distribution in the collector is extremely uneven, which will lead to reduced fan efficiency and increased fan noise.

[0005] Therefore, when the fan's flow rate varies due to different external environments, the fan's operating point is not always at its optimal efficiency point. This results in uneven air intake and high noise levels in the collector under different air volumes, which is a technical problem that urgently needs to be solved in this field. Utility Model Content

[0006] The technical problem to be solved by this utility model is to overcome the above-mentioned defects of the prior art and provide a fan and a gas water heater containing the same.

[0007] The present invention solves the above-mentioned technical problems through the following technical solution:

[0008] A type of fan, characterized in that it includes:

[0009] The volute has an installation port.

[0010] The impeller is disposed inside the volute and is an annular structure surrounding the mounting port;

[0011] The collector is an annular structure disposed on the mounting port and coaxially with the impeller. The collector includes a fixing part and an adjusting part arranged sequentially from the outside to the inside along the radial direction of the collector. The outer ring of the fixing part is connected to the periphery of the mounting port, and the outer ring of the adjusting part is connected to the inner ring of the fixing part. The inner ring of the adjusting part extends obliquely into the volute. The adjusting part is made of an elastic material. The inner ring of the adjusting part forms an air inlet, and the inner ring of the adjusting part has a notch that penetrates along the axial direction of the collector. The notch extends radially.

[0012] The air inlet area changes with the air volume of the fan, and the air inlet area is positively correlated with the air volume of the fan.

[0013] In this technical solution, by setting the specific structure of the collector, the air inlet area changes with the air volume of the fan, and the air inlet area is positively correlated with the air volume of the fan. This allows the air inlet area to be adaptively adjusted according to the air volume of the fan, ensuring that the air inlet area and the fan are matched under different air volumes, so that the fan efficiency is always at the optimal value. This effectively solves the problems of uneven air intake of the collector and the noise caused by uneven air intake in the prior art.

[0014] Preferably, the number of the notches is multiple, and there are two to six, with the multiple notches spaced apart circumferentially along the adjustment portion.

[0015] In this technical solution, the above settings enable the air inlet area to change more effectively with the air volume of the fan.

[0016] Preferably, the number of notches is even; and / or, a plurality of notches are equidistantly spaced along the circumference of the adjustment portion.

[0017] In this technical solution, the above settings enable a more uniform distribution of airflow on the collector.

[0018] Preferably, the inner diameter of the impeller is d1, and the inner diameter of the air inlet in the initial state is d2, where 0.7*d1≤d2≤0.9*d1;

[0019] The maximum inner diameter of the air inlet in the working state is d2', d2' <d1。

[0020] In this technical solution, by setting the relationship between d2, d2' and d1, the range of values ​​for the inner diameter d2 of the air inlet in the initial state and the maximum inner diameter d2' in the working state is limited. This avoids the inner diameter d2 of the air inlet in the initial state being too small to achieve effective air intake, and the inner diameter d2 of the air inlet in the initial state and the maximum inner diameter d2' of the air inlet in the working state being too large, which would affect the normal operation of the impeller.

[0021] Preferably, along the radial direction, the size of the adjusting part is a1, the size of the notch is a2, and 0.5*a1≤a2≤0.9*a1.

[0022] In this technical solution, by setting the relationship between a2 and a1, the range of values ​​for the radial dimension a2 of the notch is limited. On the one hand, this avoids the radial dimension a2 of the notch being too small, so that the air inlet area of ​​the air inlet can be effectively changed with the air volume of the fan. On the other hand, it avoids the radial dimension a2 of the notch being too large, which would reduce the structural strength of the adjustment part.

[0023] Preferably, the width of the notch is c, where 2mm ≤ c ≤ 4mm.

[0024] In this technical solution, by setting the range of the width c of the notch, on the one hand, the width c of the notch is not too small, which would increase the manufacturing cost; on the other hand, the width c of the notch is not too large, which would prevent the air inlet area from changing effectively with the air volume of the fan.

[0025] Preferably, along the axial direction, the distance between the inner wall of the volute and the side of the impeller near the mounting port is e1, and the size of the adjustment part in the initial state is e2, 0.8*e1≤e2≤0.9*e1.

[0026] In this technical solution, by setting the relationship between e2 and e1, the range of the value of the size e2 of the adjustment part in the initial state is limited, so as to avoid the size e2 of the adjustment part in the initial state being too large or too small, which would prevent the air inlet area of ​​the air inlet from changing effectively with the air volume of the fan.

[0027] Preferably, the notch is elongated.

[0028] In this technical solution, by setting the shape of the notch to be elongated, it is easier to control the size of the notch, thereby making it easier to adjust the elasticity of the air inlet.

[0029] Preferably, the fixing part and the adjusting part are integrally formed.

[0030] In this technical solution, by making the fixing part and the adjusting part integrally molded, the overall structure of the collector can be made more stable.

[0031] A gas water heater characterized in that it includes a fan as described above.

[0032] The positive and progressive effects of this utility model are as follows:

[0033] By designing the specific structure of the collector, the air inlet area changes with the fan's airflow, and the air inlet area is positively correlated with the fan's airflow. This allows the air inlet area to adaptively adjust to the fan's airflow, ensuring that the air inlet area and the fan match under different airflow conditions. This keeps the fan's efficiency at its optimal value, effectively solving the problems of uneven airflow in the collector and the noise caused by uneven airflow in existing technologies. Attached Figure Description

[0034] Figure 1 The graph shows the change in fan air volume with flue back pressure in the background technology.

[0035] Figure 2 This is a cross-sectional structural diagram of a wind turbine in the background art.

[0036] Figure 3 This is a diagram showing the wind speed distribution of a fan passing through a collector under low flow conditions in the background technology.

[0037] Figure 4 This is a three-dimensional structural diagram of a fan according to a preferred embodiment of the present invention.

[0038] Figure 5 This is a top view of a preferred embodiment of the fan of the present invention.

[0039] Figure 6 for Figure 5 A magnified schematic diagram of part A in the middle.

[0040] Figure 7 for Figure 5 A schematic diagram of the cross-sectional structure along the BB direction.

[0041] Figure 8 for Figure 7 A magnified schematic diagram of part C in the middle.

[0042] Figure 9 This is a cross-sectional structural diagram of the volute of a fan according to a preferred embodiment of the present invention.

[0043] Explanation of reference numerals in the attached figures

[0044] Fan 1

[0045] 10 worm shell

[0046] Installation port 11

[0047] Impeller 20

[0048] Collector 30

[0049] Fixing part 31

[0050] Adjustment section 32

[0051] Air inlet 321

[0052] Gap 322

[0053] Axial O

[0054] Radial R Detailed Implementation

[0055] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0056] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "circumferential", "radial", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0057] Furthermore, 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0058] like Figures 4 to 9 As shown, this embodiment provides a fan 1, which includes: a volute 10, an impeller 20, and a collector 30.

[0059] The volute 10 has an installation port 11. The impeller 20 is disposed inside the volute 10 and is an annular structure surrounding the installation port 11. The collector 30 is an annular structure disposed on the installation port 11 and coaxially arranged with the impeller 20. The collector 30 includes a fixing part 31 and an adjusting part 32 arranged sequentially from the outside to the inside along the radial direction R of the collector 30. The outer ring of the fixing part 31 is connected to the periphery of the installation port 11, and the outer ring of the adjusting part 32 is connected to the inner ring of the fixing part 31. The inner ring of the adjusting part 32 extends obliquely into the volute 10. The adjusting part 32 is made of an elastic material. The inner ring of the adjusting part 32 forms an air inlet 321, and the inner ring of the adjusting part 32 has a notch 322 that penetrates along the axial direction of the collector. The notch 322 extends radially R. The air inlet 321 changes its air intake area according to the air volume of the fan 1, and the air intake area of ​​the air inlet 321 is positively correlated with the air volume of the fan 1.

[0060] In this way, by setting the specific structure of the collector 30, the air inlet area of ​​the air inlet 321 changes with the air volume of the fan 1, and the air inlet area of ​​the air inlet 321 is positively correlated with the air volume of the fan 1. Thus, the air inlet area of ​​the air inlet 321 can be adaptively adjusted according to the air volume of the fan 1, so that the air inlet area of ​​the air inlet 321 and the fan 1 are matched under different air volumes, so that the efficiency of the fan 1 is always at the optimal value. This effectively solves the problems of uneven air intake of the collector 30 and the noise caused by uneven air intake in the prior art.

[0061] It should be noted that, in Figures 4-8 In the initial state, the regulating part 32 is in the initial state. When the external back pressure of the gas water heater is small, the air volume of the whole unit will increase, and the corresponding airflow velocity will increase. Due to the elastic material of the regulating part 32 and the setting of the notch 322, the regulating part 32 will undergo elastic deformation and the air inlet 321 will gradually open inward and be in the working state. Thus, the diameter and air inlet area of ​​the air inlet 321 will gradually increase. When the external back pressure increases, the air volume of the whole unit decreases. Due to the decrease in the wind speed of the collector 30, the regulating part 32 gradually returns to the initial state. Therefore, the diameter and air inlet area of ​​the air inlet 321 can be adaptively adjusted according to the air volume of the fan 1, so that the diameter of the collector 30 and the fan 1 are matched under different air volumes, and the efficiency of the fan 1 is always at the optimal value.

[0062] Furthermore, since the collector 30 has an annular structure, and it includes a fixing part 31 and an adjusting part 32 arranged sequentially from the outside to the inside along the radial direction R of the collector 30, both the fixing part 31 and the adjusting part 32 are annular structures. The collector 30 is coaxially arranged with the impeller 20, that is, the axial direction O of the collector 30 is in the same direction as the axial direction of the impeller 20; the radial direction R of the collector 30 is in the same direction as the radial direction of the impeller 20.

[0063] Preferably, there are a plurality of notches 322, specifically two to six, and the plurality of notches 322 are arranged at intervals along the circumferential direction of the adjusting portion 32. This arrangement enables the air inlet area of the air inlet 321 to be more effectively changed along with the air volume of the fan 1.

[0064] Further, the number of the notches 322 is an even number; the plurality of notches 322 are arranged at equal intervals along the circumferential direction of the adjusting portion 32. This arrangement enables the air flow to be more uniformly distributed on the collector 30.

[0065] Specifically, in this embodiment, the number of the notches 322 is two, and the two notches 322 are arranged at equal intervals along the circumferential direction of the adjusting portion 32. However, the present invention is not limited thereto. In other embodiments, the number of the notches 322 may be three, four, five or six; the plurality of notches 322 may be arranged at equal intervals or at unequal intervals along the circumferential direction of the adjusting portion 32.

[0066] Preferably, the inner diameter of the impeller 20 is d1, the inner diameter of the air inlet 321 in an initial state is d2, 0.7*d1≤d2≤0.9*d1; the maximum inner diameter of the air inlet 321 in a working state is d2', d2'<d1. In this way, by setting the relationship among d2, d2' and d1, the value ranges of the inner diameter d2 of the air inlet 321 in the initial state and the maximum inner diameter d2' of the air inlet 321 in the working state are defined, so as to avoid that the inner diameter d2 of the air inlet 321 in the initial state is too small to achieve effective air intake, and that the inner diameter d2 of the air inlet 321 in the initial state and the maximum inner diameter d2' of the air inlet 321 in the working state are too large to affect the normal operation of the impeller 20.

[0067] Preferably, along the radial direction R, the dimension of the adjusting portion 32 is a1, and the dimension of the notch 322 is a2, 0.5*a1≤a2≤0.9*a1. In this way, by setting the relationship between a2 and a1, the value range of the dimension a2 of the notch 322 along the radial direction R is defined. On one hand, it prevents the dimension a2 of the notch 322 along the radial direction R from being too small to enable the air inlet area of the air inlet 321 to be effectively changed along with the change of the air volume of the fan 1; on the other hand, it prevents the dimension a2 of the notch 322 along the radial direction R from being too large to reduce the structural strength of the adjusting portion 32 itself.

[0068] Preferably, the width of the notch 322 is c, 2mm≤c≤4mm. In this way, by defining the value range of the width c of the notch 322, on one hand, it prevents the manufacturing cost from increasing when the width c of the notch 322 is too small; on the other hand, it prevents the width c of the notch 322 from being too large to enable the air inlet area of the air inlet 321 to be effectively changed along with the change of the air volume of the fan 1. It should be noted that the width c of the notch 322 refers to the dimension of the notch 322 along the circumferential direction of the adjusting portion 32.

[0069] Preferably, along the axial direction O of the collector 30, the distance between the inner wall of the volute 10 and the side of the impeller 20 near the mounting port 11 is e1, and the initial dimension of the adjusting part 32 is e2, where 0.8*e1≤e2≤0.9*e1. By setting the relationship between e2 and e1, the range of the initial dimension e2 of the adjusting part 32 is limited, preventing the initial dimension e2 of the adjusting part 32 from being too large or too small, thus ensuring that the air inlet area of ​​the air inlet 321 can effectively change with the airflow of the fan 1. It should be noted that along the axial direction O of the collector 30, the adjusting part 32 includes a fixed end connected to the fixed part 31 and a free end away from the fixed part 31; the initial dimension e2 of the adjusting part 32 along the axial direction O of the collector 30 refers to the distance from the fixed end to the free end along the axial direction O of the collector 30.

[0070] Along the axial direction O of the collector 30, the maximum dimension of the adjustment part 32 in the working state is e2'; e2' can be greater than e1 or less than e1.

[0071] Preferably, the notch 322 is elongated. This elongated shape allows for better control of the notch's dimensions, making it easier to adjust the elasticity of the air inlet 321. However, this is not a limitation; in other embodiments, the notch 322 can also be other shapes.

[0072] In this embodiment, the fixing part 31 and the adjusting part 32 are integrally formed. By making the fixing part 31 and the adjusting part 32 integrally formed, the overall structure of the collector 30 can be made more stable. Since the adjusting part is made of an elastic material, the overall structure of the collector 30 is made of an elastic material; specifically, the collector 30 is made of rubber or other materials with elastic recovery properties.

[0073] This embodiment also provides a gas water heater, which includes the fan 1 as described above.

[0074] The gas water heater in this embodiment can be controlled by a voice module, which is equipped with a controller, a voice receiving module, and a voice parsing module. The voice receiving module receives user commands, and the voice parsing module parses the commands. Based on the parsed commands, the controller controls the gas water heater to perform corresponding operations, thereby realizing intelligent control of the gas water heater and improving the user experience.

[0075] This embodiment, by setting the specific structure of the collector, allows the air inlet area to change with the fan's airflow, and the air inlet area is positively correlated with the fan's airflow. This enables the air inlet area to adaptively adjust with the fan's airflow, ensuring that the air inlet area and the fan are matched under different airflow conditions. This keeps the fan's efficiency at its optimal value, effectively solving the problems of uneven airflow in the collector and the noise caused by uneven airflow in the prior art.

[0076] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A fan, characterized by, It includes: The volute has an installation port. The impeller is disposed inside the volute and is an annular structure surrounding the mounting port; The collector is an annular structure disposed on the mounting port and coaxially with the impeller. The collector includes a fixing part and an adjusting part arranged sequentially from the outside to the inside along the radial direction of the collector. The outer ring of the fixing part is connected to the periphery of the mounting port, and the outer ring of the adjusting part is connected to the inner ring of the fixing part. The inner ring of the adjusting part extends obliquely into the volute. The adjusting part is made of an elastic material. The inner ring of the adjusting part forms an air inlet, and the inner ring of the adjusting part has a notch that penetrates along the axial direction of the collector. The notch extends radially. The air inlet area changes with the air volume of the fan, and the air inlet area is positively correlated with the air volume of the fan.

2. The fan of claim 1, wherein The number of the notches is multiple, ranging from two to six, and the multiple notches are spaced apart circumferentially along the adjustment part.

3. The fan of claim 2, wherein The number of notches is even; and / or, multiple notches are equidistantly spaced along the circumference of the adjustment part.

4. The fan of claim 1, wherein The inner diameter of the impeller is d1, and the inner diameter of the air inlet in the initial state is d2, where 0.7*d1≤d2≤0.9*d1; The maximum inner diameter of the air inlet in the working state is d2', d2' <d1。 5. The fan of claim 1, wherein Along the radial direction, the size of the adjusting part is a1, the size of the notch is a2, and 0.5*a1≤a2≤0.9*a1.

6. The fan of claim 1, wherein The width of the notch is c, where 2mm ≤ c ≤ 4mm.

7. The fan of claim 1, wherein Along the axial direction, the distance between the inner wall of the volute and the side of the impeller near the mounting port is e1, and the size of the adjustment part in the initial state is e2, 0.8*e1≤e2≤0.9*e1.

8. The fan as described in claim 1, characterized in that, The notch is elongated.

9. The fan as described in any one of claims 1-8, characterized in that, The fixing part and the adjusting part are integrally formed.

10. A gas water heater, characterized by, It includes the fan as described in any one of claims 1-9.

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