Gas water heater fan impeller with two-section fan blades

Abstract

The utility model discloses a gas water heater fan impeller with two-section fan blades. The gas water heater fan impeller comprises a circular hub, a front cover plate and a plurality of blades, all the blades are annularly and uniformly distributed around a rotating shaft of the hub; each blade comprises an inner side arc-shaped part and an outer side arc-shaped part; each inner side arc-shaped part and the corresponding outer side arc-shaped part belonging to the same blade are of a strip-shaped structure which has an arc-shaped cross section and extends from the hub to the front cover plate in the direction of a rotating shaft of the hub, and the curvature radiuses of the concave sides of the cross sections of each inner side arc-shaped part and the corresponding outer side arc-shaped part are different; and the joint position between each inner side arc-shaped part and the outer side arc-shaped part belonging to the same blade is the tangent position of the concave side of the cross section of the corresponding inner side arc-shaped part and the concave side of the cross section of the corresponding outer side arc-shaped part. Due to the application of the fan impeller, the fan impeller of the gas water heater not only has excellent salt corrosion resistance, but also can effectively replace a metal impeller on the premise that the pressure-flow performance of the fan is not reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of domestic gas equipment manufacturing, in particular to a gas water heater fan impeller with two-stage fan blades. Background Art

[0002] The impeller in the gas water heater is a key component installed on the fan motor. Its function is to convert the mechanical energy of the motor into the static and dynamic pressure energy of the air. When the water heater is working, the impeller not only provides the burner with the necessary oxygen to support the combustion process of the gas, but also is responsible for reducing the temperature inside the burner and discharging the exhaust gas generated by the combustion.

[0003] At present, the fan impellers of gas water heaters commonly found on the market are usually made of galvanized steel plates. Although this type of sheet metal has a galvanized layer on the surface to provide a certain degree of corrosion protection, these impellers still face serious corrosion problems in high-salt environments such as coastal areas.

[0004] However, due to the higher concentration of salt in the air in coastal areas, this will accelerate the corrosion rate of metal parts, thereby shortening the service life of the impeller and may affect the stability and safety of the entire water heater system.

[0005] like Figure 1 As shown, the conventional metal impeller is formed by riveting a front cover plate 3, a hub 1 and a plurality of blades 2.

[0006] In practical applications, the existing metal impellers are limited by the difficulty of processing complex structures of metal sheet metal parts, and the existing metal blades mostly adopt a single-segment arc structure. In addition, during the riveting process of sheet metal parts, it is inevitable that scratches and hard contacts will occur, resulting in damage to the metal surface and worse corrosion resistance.

[0007] In order to improve the salt corrosion resistance of the impeller in coastal areas or outdoor water heaters, many manufacturers have begun to use resin materials to enhance the corrosion resistance of the impeller to ensure its long-term stable operation in harsh environments.

[0008] Therefore, how to ensure the performance of the fan when the flow channel becomes narrower after switching to resin material has become a technical problem that technical personnel in this field urgently need to solve. Utility Model Content

[0009] In view of the above-mentioned defects of the prior art, the utility model provides a gas water heater fan impeller with two-stage fan blades, the purpose of which is to make the gas water heater fan impeller not only have excellent salt corrosion resistance, but also effectively replace the metal impeller without reducing the pressure-flow performance of the fan.

[0010] To achieve the above object, the utility model discloses a gas water heater fan impeller with two-stage fan blades, comprising a circular hub, an annular front cover plate, and a plurality of blades arranged between the hub and the front cover plate.

[0011] Wherein, all the blades are evenly distributed in an annular shape around the rotating axis of the hub;

[0012] Each of the blades comprises an inner arc portion and an outer arc portion;

[0013] Each of the inner arc-shaped portions and the corresponding outer arc-shaped portion belonging to the same blade are arc-shaped in cross section, and are strip-shaped structures extending from the hub to the front cover plate along the rotation axis direction of the hub, and the curvature radius of the concave side of the cross section of each of the inner arc-shaped portions and the corresponding outer arc-shaped portion are different;

[0014] The joining position between each inner arc portion and the outer arc portion belonging to the same blade is at a position where the concave side of the cross section of the corresponding inner arc portion and the corresponding outer arc portion are tangent.

[0015] Preferably, the joining position between each of the inner arc-shaped portions and the outer arc-shaped portion belonging to the same blade is at an intersection position at which an angle of 15.49 degrees is formed between a tangent on the concave side of the cross-section of the inner arc-shaped portion and a tangent of a circle with a diameter of 89 mm and the rotation axis of the hub as the center.

[0016] Preferably, the inlet angle of each blade is 60 degrees, and is located at the intersection of a tangent on the concave side of the corresponding inner arc-shaped portion cross-section and a tangent of a circle with a diameter of 56 mm and the rotation axis of the hub as the center, forming an angle of 60 degrees.

[0017] Preferably, the outlet angle of each blade is 8 degrees, and is located at an intersection of 8 degrees between the tangent of the concave side of the corresponding outer arc-shaped portion cross-section and the tangent of a circle with a diameter of 91 mm and the rotation axis of the hub as the center.

[0018] Preferably, the inner side of each blade close to the rotation axis of the hub is tilted relative to the rotation axis of the hub, and the closer the position to the hub is, the smaller the distance between the blade and the rotation axis of the hub is.

[0019] Preferably, the hub, the front cover plate and all the blades are an integral part, and are manufactured by integral casting using a material in which glass fiber is added to PBT.

[0020] Preferably, a mounting hole for connecting to a drive shaft of a motor is provided at the center of the wheel hub;

[0021] After the drive shaft passes through the mounting hole, a gasket and a nut are arranged for fastening.

[0022] Preferably, the inner diameter of the front cover plate is larger than the outer diameter of the wheel hub.

[0023] Beneficial effects of the utility model:

[0024] The application of the utility model enables the gas water heater fan impeller to not only have excellent salt corrosion resistance, but also effectively replace the metal impeller without reducing the pressure-flow performance of the fan.

[0025] The utility model not only significantly improves the corrosion resistance of the impeller in high-salt environments such as coastal areas, but also ensures the efficient operation of the gas water heater fan, achieving the dual goals of material upgrading and performance optimization.

[0026] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The schematic diagram of the structure of the fan impeller of the gas water heater in the prior art is shown.

[0028] Figure 2 A structural schematic diagram of an embodiment of the utility model is shown.

[0029] Figure 3 A structural schematic diagram showing a partial cross section of a fan blade in an embodiment of the utility model is shown. DETAILED DESCRIPTION

[0030] Example

[0031] like Figures 2 to 3 As shown, the gas water heater fan impeller with two-stage fan blades includes a circular hub 1, an annular front cover plate 3, and a plurality of blades 2 arranged between the hub 1 and the front cover plate 3.

[0032] Wherein, all blades 2 are evenly distributed in a ring around the rotating axis of the hub 1;

[0033] Each blade 2 includes an inner arc portion 21 and an outer arc portion 22;

[0034] Each inner arc portion 21 and the corresponding outer arc portion 22 belonging to the same blade 2 are arc-shaped in cross section, and are strip-shaped structures extending from the hub 1 to the front cover plate 3 along the rotation axis direction of the hub 1, and the curvature radius of the concave side of the cross section of each inner arc portion 21 and the corresponding outer arc portion 22 are different;

[0035] The joining position between each inner arc portion 21 and the outer arc portion 22 belonging to the same blade 2 is at a position where the concave side of the cross section of the corresponding inner arc portion 21 and the corresponding outer arc portion 22 are tangent.

[0036] In actual application, when the utility model rotates, a negative pressure area will be formed in the central area of ​​the annularly evenly distributed blades 2, and the air is sucked into the negative pressure area from the center position of the front cover plate 3 where the air inlet of the volute is installed, toward the hub 1, and then enters the flow channel between every two blades 2 through the inlet angle of the inner arc portion 21 of each blade 2, and then enters the output flow channel of the volute after being accelerated and pressurized through the outer arc portion 22 of each blade 2.

[0037] The two-stage blade 2 including the inner arc portion 21 and the outer arc portion 22 allows the gas to first be guided by the inner arc portion 21 after entering the flow channel, and then be accelerated and pressurized by the outer arc portion 22 before flowing out of the blade 2, and finally enter the volute channel.

[0038] The two-stage blade 2 in the utility model can guide and accelerate the airflow more effectively compared with the traditional one-stage blade structure. The two-stage blade 2 can quickly increase the air flow rate at startup and provide continuous and stable airflow and pressure during the stable operation stage, thereby improving the PQ performance of the fan.

[0039] In some embodiments, the joining position between each inner arc portion 21 and the outer arc portion 22 belonging to the same blade 2 is at an intersection position at which an angle of 15.49 degrees is formed between a tangent line on the concave side of the cross section of the inner arc portion 21 and a tangent line of a circle with a diameter of 89 mm and the rotation axis of the hub 1 as the center.

[0040] In some embodiments, the inlet angle of each blade 2 is 60 degrees, and is located at the intersection of a tangent on the concave side of the corresponding inner arc portion 21 cross section and a tangent of a circle with a diameter of 56 mm and the rotation axis of the hub 1 as the center, forming an angle of 60 degrees.

[0041] In some embodiments, the outlet angle of each blade 2 is 8 degrees, and is located at an intersection of an angle of 8 degrees between a tangent of the concave side of the cross section of the corresponding outer arc portion 22 and a tangent of a circle with a diameter of 91 mm and the rotation axis of the hub 1 as the center.

[0042] The two-stage blades 2 have different inlet angles and outlet angles, which are more helpful in providing optimized airflow dynamics performance during startup and stable operation.

[0043] In some embodiments, the inner side 23 of each blade 2 close to the rotation axis of the hub 1 is tilted relative to the rotation axis of the hub 1 , and the closer the blade is to the hub 1 , the smaller the distance between the blade and the rotation axis of the hub 1 .

[0044] In practical applications, the closer the inner side edges 23 of all blades 2 close to the rotation axis of the hub 1 are to the hub 1, the smaller the distance between them and the rotation axis of the hub 1 is, which is conducive to the intake of air and the smooth flow into the flow channel.

[0045] In some embodiments, the hub 1, the front cover plate 3 and all the blades 2 are an integral part, which are manufactured by integral casting using a material in which glass fiber is added to PBT.

[0046] In practical applications, the toughness and strength of the utility model can be improved by using a material in which glass fiber is added to PBT for integral casting.

[0047] Moreover, the high-performance resin material of adding glass fiber to PBT is adopted, and the integrated molding is carried out through precise mold technology, which ensures the structural integrity and mechanical properties of the utility model. Even when the blade thickness increases and the flow channel becomes narrower, the PQ performance of the utility model at the air outlet can still be comparable to that of the impeller of metal materials. This not only meets the demand for improving the salt corrosion resistance, but also maintains the original high performance requirements.

[0048] The utility model adopts high-performance resin material, while the existing technical solutions usually use metal materials, so it has better chemical corrosion resistance, especially in high-salt environments. The replaced resin material has excellent chemical corrosion resistance, so the corrosion resistance of the utility model in high-salt environments is significantly improved, thereby extending the service life of the impeller.

[0049] The utility model can be integrally formed through a precise mold process, so that the mechanical performance and structural integrity of the utility model are better guaranteed.

[0050] Resin materials are lighter than metal materials, which helps reduce the energy consumption of the system and improve energy efficiency.

[0051] Due to the corrosion resistance and structural integrity of the resin impeller, the utility model can ensure the efficient and stable operation of the gas water heater in various environments.

[0052] In some embodiments, a mounting hole 11 for connecting to a drive shaft of a motor is provided at the center of the hub 1;

[0053] After the drive shaft passes through the mounting hole 11, a washer and a nut are arranged for fastening.

[0054] In some embodiments, the inner diameter of the front cover plate 3 is greater than the outer diameter of the wheel hub 1 .

[0055] The preferred specific embodiments of the utility model are described in detail above. It should be understood that ordinary technicians in this field can make many modifications and changes based on the concept of the utility model without creative work. Therefore, all technical solutions that can be obtained by technicians in this technical field based on the concept of the utility model through logical analysis, reasoning or limited experiments on the basis of the existing technology should be within the scope of protection determined by the claims.

Claims

1. A two-stage fan impeller for a gas water heater, comprising a circular hub (1), an annular front cover plate (3), and a plurality of blades (2) arranged between the hub (1) and the front cover plate (3); characterized in that: All the blades (2) are evenly distributed in a ring shape around the rotating axis of the hub (1); Each of the blades (2) comprises an inner arc-shaped portion (21) and an outer arc-shaped portion (22); Each of the inner arc-shaped portions (21) and the corresponding outer arc-shaped portion (22) belonging to the same blade (2) are arc-shaped in cross section and are strip-shaped structures extending from the hub (1) to the front cover plate (3) along the rotation axis direction of the hub (1), and the curvature radius of the concave side of the cross section of each of the inner arc-shaped portions (21) and the corresponding outer arc-shaped portion (22) are different; The joining position between each inner arc portion (21) and the outer arc portion (22) belonging to the same blade (2) is at a position where the concave side of the cross section of the corresponding inner arc portion (21) and the corresponding outer arc portion (22) are tangent.

2. The gas water heater fan impeller with two-stage fan blades according to claim 1, characterized in that: The joining position between each inner arc-shaped portion (21) and the outer arc-shaped portion (22) belonging to the same blade (2) is located at an intersection position at an angle of 15.49 degrees between a tangent line on the concave side of the cross section of the inner arc-shaped portion (21) and a tangent line of a circle with a diameter of 89 mm and the rotation axis of the hub (1) as the center.

3. The gas water heater fan impeller with two-stage fan blades according to claim 1, characterized in that: The inlet angle of each blade (2) is 60 degrees, and each blade (2) is located at an intersection of a tangent line on the concave side of the cross section of the corresponding inner arc-shaped portion (21) and a tangent line of a circle with a diameter of 56 mm and the rotation axis of the hub (1) as the center, at an angle of 60 degrees.

4. The gas water heater fan impeller with two-stage fan blades according to claim 1, characterized in that: The outlet angle of each blade (2) is 8 degrees, and each blade (2) is located at an intersection of an angle of 8 degrees between a tangent line on the concave side of the cross section of the corresponding outer arc-shaped portion (22) and a tangent line of a circle with a diameter of 91 mm and the rotation axis of the hub (1) as the center.

5. The gas water heater fan impeller with two-stage fan blades according to claim 1, characterized in that: The inner side edge (23) of each blade (2) close to the rotation axis of the hub (1) is tilted relative to the rotation axis of the hub (1), and the closer the blade is to the hub (1), the smaller the distance between the blade and the rotation axis of the hub (1).

6. The gas water heater fan impeller with two-stage fan blades according to claim 1, characterized in that: The wheel hub (1), the front cover plate (3) and all the blades (2) are an integral part, and are manufactured by integral casting using a material in which glass fiber is added to PBT.

7. The gas water heater fan impeller with two-stage fan blades according to claim 1, characterized in that: A mounting hole (11) for connecting to a drive shaft of a motor is provided at the center of the wheel hub (1); After the drive shaft passes through the mounting hole (11), a gasket and a nut are arranged for fastening.

8. The gas water heater fan impeller with two-stage fan blades according to claim 1, characterized in that: The inner diameter of the front cover plate (3) is greater than the outer diameter of the wheel hub (1).

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