A silent impeller

Abstract

The utility model relates to a silent impeller, including a plurality of blades, one side of the blades is fixed on a first fan disc, an opening is provided in the middle of the first fan disc, the blades are arranged spirally and radiately from the middle to the surroundings, the thickness of the blades gradually increases from the inside to the outside of the fan disc, and the blades are extended outward in an arc shape from the tangent direction of the starting position of the previous blade. It also includes a second fan disc covering the other side of the blade. The impeller as a whole adopts a blade that is narrow in the middle and wide on the outside, which makes the rotation heavier and secondly adapts to the outflow of the fluid, effectively avoiding the negative pressure area between the inner arc and the fluid due to the excessive rotation speed of the blade. When the fluid is thrown out by the blade, the outer arc of the blade pushes the fluid, and the contact part between the fluid and the inner arc is necessarily smaller than the fluid flow rate of the blade, which cannot supplement the inner arc part of the blade, resulting in a negative pressure area.

Description

Technical Field

[0001] The utility model relates to a rotor applied to fluid, in particular to a silent impeller applied to liquid. Background Art

[0002] Most of the noise during the rotation of the pump body comes from the impeller, the collision between the impeller and the fluid, especially when the impeller disturbs the fluid, a sudden change in local flow is formed, or the fluid velocity is too fast to form a fluid collision, or gas overflow and bubble burst in the fluid. Existing impellers, such as a two-stage high-pressure centrifugal fan with publication number CN118462614A, use blades with uniform wall thickness, "adopt an arc-shaped guide vane structure to ensure smooth air flow", and "make the air inlet collector stick closely to the inner circle of the impeller blades" to reduce noise. However, the situation is different and does not apply in liquids. Utility Model Content

[0003] In order to solve the problem of high noise generated by an impeller when operating in a liquid, the utility model provides a silent impeller, the structure of which guides the fluid to avoid noise caused by abnormal flow velocity during the movement of the fluid.

[0004] The technical solution adopted by the utility model is: a silent impeller, including a plurality of blades, one side of the blades is fixed on a first fan disk, an opening is provided in the middle of the first fan disk, the blades are arranged spirally radiating from the middle to the surroundings, the thickness of the blades gradually increases from the inside to the outside of the fan disk, and the blades are extended outward in an arc shape from the tangential direction of the starting position of the previous blade. It also includes a second fan disk covering the other side of the blade. The impeller as a whole adopts a blade that is narrow in the middle and wide on the outside, which makes it heavier to rotate, and secondly adapts to the outflow of fluid, effectively avoiding the negative pressure area between the inner arc and the fluid due to the excessive rotation speed of the blade. When the fluid is thrown out by the blade, the outer arc of the blade pushes the fluid, and the contact part between the fluid and the inner arc is necessarily smaller than the fluid flow rate of the blade, which cannot supplement the inner arc part of the blade, resulting in a negative pressure area.

[0005] As one of the preferred solutions for a silent impeller, the opening is folded outward, an inner edge of the opening forms an arc surface, and the fan blades extend into the lower end of the arc surface.

[0006] As one of the preferred solutions for a silent impeller, the inner arc and the outer arc of the blade are perfect arcs. The double arc design is used to adapt to the direction of fluid movement, avoiding disturbance when contacting the inner and outer walls of the blade, so that the fluid flows out smoothly from the inside to the outside.

[0007] As one of the preferred solutions for a silent impeller, the inner edge of the outer end of the blade is provided with a cut angle. The cut angle is set to effectively prevent the gradually increasing arc thickness from forming a thick plane at the outer end. The thick plane and the turbine cavity squeeze to form an extremely fast flow channel, which will also generate noise. The cut angle is set to avoid a thick plane at the tail. The connection between the cut angle and the inner arc is provided with an arc chamfer. The arc chamfer makes the fluid flow smoother.

[0008] As one of the preferred solutions for a silent impeller, the diameter of the arc formed by the starting end of the blade is larger than the inner diameter of the opening. If the starting end of the blade is located at the opening, the water flow will inevitably directly contact the blade when flowing in, and the instantaneous change of flow direction will also generate noise. Therefore, the diameter formed by the starting end of the blade is larger than the opening, that is, the starting end of the blade is separated from the opening by a certain distance to avoid the noise caused by the instantaneous reversal of the fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a three-dimensional diagram of the utility model.

[0010] Figure 2 This is a three-dimensional diagram of the fan blades.

[0011] Figure 3 This is a plane view of the fan blade.

[0012] Among them: 1. fan blades; 2. first fan disc; 3. opening; 4. second fan disc; 5. arc surface; 6. inner arc; 7. outer arc; 8. corner cutting. DETAILED DESCRIPTION

[0013] The utility model will be further described below in conjunction with the specific drawings.

[0014] like Figures 1 to 3 As shown: A silent impeller, including a plurality of blades 1, one side of the blades 1 is fixed on a first fan disk 2, an opening 3 is provided in the middle of the first fan disk 2, the blades 1 are arranged to radiate spirally from the middle to the surroundings, the thickness of the blades 1 gradually increases from the inside to the outside of the fan disk, and the blades 1 are extended outwardly in an arc shape from the tangent direction of the starting part of the previous blade 1. It also includes a second fan disk 4 covering the other side of the blade 1. The opening is folded outward, the opening is folded outward and the inner edge of the opening forms an arc surface 5, which can effectively guide the flow direction of the inlet fluid, and the blade 1 extends into the lower end of the arc surface 5.

[0015] In this embodiment, in order to avoid disturbance when contacting the inner and outer walls of the blade 1 and to allow the fluid to flow out smoothly from the inside to the outside, the inner arc 6 and the outer arc 7 of the blade 1 are perfect arcs. The double arc design is used to adapt to the direction of fluid movement.

[0016] In this embodiment, a cut corner 8 is provided at the inner edge of the outer end of the blade 1. A circular chamfer is provided at the connection between the cut corner 8 and the inner arc 6. The circular chamfer makes the fluid thrown out by the blade 1 flow more smoothly, avoiding the narrow channel formed between the outer ring of the blade 1 and the turbine cavity to affect the fluid flow. In this embodiment, the starting end of the blade 1 is spaced a certain distance from the opening 3 to avoid the noise caused by the instantaneous reversal of the fluid.

[0017] Based on the above embodiments, this embodiment can be modified according to specific circumstances, such as canceling the design of the cut corner 8 and changing the arc. The above modifications may make the noise slightly louder. Although the above implementation is not given as an example in this application, it should be known that the above modifications still fall within the protection scope of this application.

[0018] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A silent impeller, comprising a plurality of blades (1), characterized in that: One side of the fan blade (1) is fixed on the first fan disc (2); an opening (3) is provided in the middle of the first fan disc (2); the fan blade (1) is arranged to radiate spirally from the middle to the surroundings; the thickness of the fan blade (1) gradually increases from the inside to the outside of the fan disc; the fan blade (1) is extended outward in an arc shape from the tangent direction of the starting position of the previous fan blade (1).

2. The silent impeller according to claim 1, characterized in that: It also includes a second fan disc (4) covering the other side of the fan blade (1).

3. The silent impeller according to claim 1, characterized in that: The opening (3) is folded outwards, the inner edge of the opening (3) forms an arc-shaped surface (5), and the fan blade (1) extends into the lower end of the arc-shaped surface (5).

4. The silent impeller according to claim 1, characterized in that: The inner arc (6) and the outer arc (7) of the fan blade (1) are perfect arcs.

5. The silent impeller according to claim 4, characterized in that: The inner edge of the outer end of the fan blade (1) is provided with a cut corner (8).

6. The silent impeller according to claim 5, characterized in that: A circular arc chamfer is provided at the connection between the cut corner (8) and the inner arc (6).

7. The silent impeller according to claim 1, characterized in that: The diameter of the circular arc formed by the starting ends of the fan blades (1) is greater than the inner diameter of the opening (3).

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