Impeller structure of centrifugal pump

Abstract

The utility model discloses a centrifugal pump impeller structure which comprises a front cover plate and a rear cover plate, a plurality of blades are installed between the front cover plate and the rear cover plate, the plurality of blades comprise front-section blades and rear-section blades, the front-section blades are fixedly connected with the rear-section blades, and the rear-section blades are fixedly connected with the front-section blades. The length of the front-section blade is twice that of the rear-section blade; the tail ends of the rear-section blades are located on the edge of the impeller structure, the outlet placement angle of the rear-section blades along the edge of the impeller structure is theta 1, and when the front-section blades extend to the edge of the impeller structure in the direction of the rear-section blades, the outlet placement angle of the front-section blades along the edge of the impeller structure is theta 2, the value range of the angle difference between theta1 and theta2 is 1-10 degrees; according to the technical scheme, an impeller inlet is further formed in the front cover plate, inlet blades are installed in the impeller inlet, and an impeller outlet is formed between every two adjacent blades.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal pump technology, specifically to a centrifugal pump impeller structure. Background Technology

[0002] The impeller is the core component of a centrifugal pump. The pump's flow rate, head, efficiency, cavitation performance, and characteristic curve shape are all closely related to the impeller's hydraulic design and shape. During operation, the flow rate and head are crucial parameters for determining whether a centrifugal pump meets specifications. The pump's performance is largely determined once the impeller is designed and manufactured. For situations where the designed flow rate and head parameters are not achieved during test bench testing or operation, or where users wish to increase these parameters for special reasons, the main measures and existing limitations in current technology for increasing the high-efficiency flow range and raising the head of centrifugal pumps include:

[0003] 1. Welding can be used to increase the impeller diameter, but this method is difficult to implement and requires secondary machining of the impeller after welding, resulting in a long processing time. For pumps with low specific speeds, the clearance between the pump casing tongue and the impeller outer diameter is very small, limiting the dimensional constraints of welding to increase the outer diameter.

[0004] 2. Trimming the back of the impeller blades at the outlet usually improves pump performance to some extent. For example, at the same flow rate, the pump head can be increased by about 2% to 5%, and the flow rate can be increased by less than 5%. However, this method results in a very small increase in head for low-pressure pumps. For example, for a single-stage head of 40m, a 5% increase would only increase the head by a maximum of 2m. Furthermore, if the impeller outlet design is relatively thin, the thickness of the blades that can be trimmed is limited, further reducing the potential increase in flow rate and head. Utility Model Content

[0005] To address the problems existing in the background art, the purpose of this utility model is to propose a centrifugal pump impeller structure. By modifying the segmented structure of the centrifugal pump impeller blades, the flow rate and head of the centrifugal pump are improved. The technical solution and beneficial effects of this utility model are as follows:

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] In the technical solution of the centrifugal pump impeller structure of this utility model, an impeller structure is included. The impeller structure includes a front cover plate and a rear cover plate. Multiple blades are installed between the front cover plate and the rear cover plate. Each of the multiple blades includes a front blade and a rear blade. The front blade and the rear blade are fixedly connected. The length of the front blade is twice the length of the rear blade. The end of the rear blade is located at the edge of the impeller structure. The outlet angle of the rear blade along the edge of the impeller structure is θ1.

[0008] Furthermore, in the technical solution of this utility model, when the front blade extends along the direction of the rear blade to the edge of the impeller structure, the outlet placement angle of the front blade along the edge of the impeller structure is θ2.

[0009] Furthermore, the relationship between θ1 and θ2 is: Δθ = θ1 - θ2, where Δθ represents the angular difference, and the range of Δθ is 1 to 10°.

[0010] Furthermore, in the technical solution of this utility model, the front cover plate is also provided with an impeller inlet, an inlet blade is installed in the impeller inlet, and an impeller outlet is provided between adjacent blades.

[0011] Beneficial effects: In summary, this utility model proposes a centrifugal pump impeller structure. By changing the segmented structure of the centrifugal pump impeller blades, that is, by changing the blade angle at the end of the blade located at the edge of the impeller structure, the outlet placement angle of the blades is increased without affecting the distribution and structural shape of the blades at the impeller inlet position. Increasing the outlet placement angle of the blades can increase the head of the centrifugal pump and broaden the high-efficiency range of the centrifugal pump.

[0012] Other features and advantages of this invention will be set forth in the following description. Attached Figure Description

[0013] To more clearly illustrate the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the overall structure of a centrifugal pump impeller according to an embodiment of the present utility model;

[0015] Figure 2 This is a partial cross-sectional schematic diagram of a centrifugal pump impeller structure according to an embodiment of the present utility model;

[0016] Figure 3 To Figure 2 An enlarged schematic diagram of the structure of the X region;

[0017] Figure 4 This is a schematic diagram illustrating the design principle of the blade outlet placement angle according to an embodiment of the present utility model;

[0018] In the diagram: A, impeller structure; A01, front cover plate; A02, rear cover plate; A03, blades; A03-1, front blades; A03-2, rear blades; A04, impeller inlet; A05, inlet blades; A06, impeller outlet. Detailed Implementation

[0019] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0020] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0021] In the description of this utility model, it should be understood that the terms "upper", "lower", "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 utility model 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 utility model.

[0022] Furthermore, in the description of this utility model, "a number" means two or more, unless otherwise explicitly specified.

[0023] Based on the problems mentioned in the background art above, this utility model embodiment proposes a centrifugal pump impeller structure. In this embodiment... Figure 1 This is a schematic diagram of the overall structure of a centrifugal pump impeller according to an embodiment of the present utility model, as shown below. Figure 1 As shown, it includes an impeller structure A, which includes a front cover plate A01 and a rear cover plate A02, with multiple blades A03 installed between the front cover plate A01 and the rear cover plate A02.

[0024] For details, please continue reading. Figure 1 In this embodiment, the front cover plate A01 is also provided with an impeller inlet A04, an inlet blade A05 is installed in the impeller inlet A04, and an impeller outlet A06 is provided between adjacent blades A03.

[0025] Specifically, in this embodiment, Figure 2 and Figure 3 This is a partial cross-sectional schematic diagram of a centrifugal pump impeller structure according to an embodiment of the present utility model, as shown below. Figure 2and Figure 3 As shown, each of the multiple blades A03 includes a front blade A03-1 and a rear blade A03-2. The front blade A03-1 and the rear blade A03-2 are fixedly connected, and the length of the front blade A03-1 is twice the length of the rear blade A03-2.

[0026] Specifically, in this embodiment, Figure 4 This is a schematic diagram illustrating the design principle of the blade outlet placement angle according to an embodiment of the present invention. Figure 4 As shown, the end of the rear blade A03-2 is located at the edge of the impeller structure A, and the outlet angle of the rear blade A03-2 along the edge of the impeller structure A is θ1; when the front blade A03-1 extends along the direction of the rear blade A03-2 to the edge of the impeller structure A, the outlet angle of the front blade A03-1 along the edge of the impeller structure A is θ2.

[0027] Wherein, Δθ=θ1-θ2, Δθ represents the angle difference, and the range of Δθ is 1~10°, that is, θ1 is greater than θ2. In this embodiment, the blade angle is changed at the end of blade A03 located at the edge of impeller structure A. Without affecting the distribution and structural shape of blade A03 at the impeller inlet A04, the purpose of the design that the length of the front blade A03-1 is twice the length of the rear blade A03-2 is to reduce the impact of the angle change of the rear blade A03-2 on the front blade A03-1, increase the outlet placement angle of blade A03, and increase the outlet placement angle of blade A03 to improve the head of the centrifugal pump and widen the high efficiency range of the centrifugal pump.

[0028] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A centrifugal pump impeller structure, comprising an impeller structure (A), said impeller structure (A) including a front cover plate (A01) and a rear cover plate (A02), wherein a plurality of blades (A03) are installed between the front cover plate (A01) and the rear cover plate (A02), characterized in that, Each of the multiple blades (A03) includes a front blade (A03-1) and a rear blade (A03-2), which are fixedly connected. The length of the front blade (A03-1) is twice the length of the rear blade (A03-2). The end of the rear blade (A03-2) is located at the edge of the impeller structure (A), and the outlet angle of the rear blade (A03-2) along the edge of the impeller structure (A) is θ1.

2. The centrifugal pump impeller structure according to claim 1, characterized in that, When the front blade (A03-1) extends along the direction of the rear blade (A03-2) to the edge of the impeller structure (A), the outlet placement angle of the front blade (A03-1) along the edge of the impeller structure (A) is θ2.

3. The centrifugal pump impeller structure according to claim 2, characterized in that, Δθ=θ1-θ2; Here, Δθ represents the angular difference, and the range of Δθ is 1 to 10°.

4. The centrifugal pump impeller structure according to claim 1, characterized in that, The front cover plate (A01) is also provided with an impeller inlet (A04), and an inlet blade (A05) is installed inside the impeller inlet (A04).

5. The centrifugal pump impeller structure according to claim 1, characterized in that, An impeller outlet (A06) is provided between adjacent blades (A03).

Images