Anti-cavitation straight blade disc pump impeller

Abstract

The invention discloses an anti-cavitation straight blade disc pump impeller which comprises a front cover plate forming the impeller and a rear cover plate located at the position opposite to the front cover plate, and the front cover plate and the rear cover plate are connected and fixed through eight sets of connecting columns distributed in the circumferential direction. Each group of connecting columns is positioned on the inner side of the radius of the wheel cover of the front cover plate close to one fifth of the periphery; the connecting column is of a streamline composite geometric structure and is in a water drop shape. Front cover plate blades are arranged on the bottom face of the front cover plate, and rear cover plate blades are arranged on the top face of the rear cover plate. The thickness of the arc-shaped blades is changed uniformly, so that the circulation area of substances behind the blades is also changed uniformly when the substances are conveyed, sudden increase and sudden decrease of the area are avoided, loss of turbulent flow and vortex is reduced, and compared with a traditional straight blade disc pump, the flow rate of the materials is increased greatly. And the anti-cavitation capability and the hydraulic efficiency of the impeller during working medium conveying are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of design and manufacturing of fluid delivery pumps, and in particular relates to an anti-cavitation straight-blade disc pump impeller. Background Art

[0002] The vane disc pump is a disc pump with a rib structure added to the impeller surface. The vane disc pump no longer relies on fluid viscosity to achieve energy conversion in a laminar flow manner, but instead uses protruding ribs of various shapes fixed to the impeller cover to perform work on the fluid. It not only has the advantages of traditional smooth disc pumps such as no clogging, less wear on flow components, and long service life, but also improves the head and efficiency of the conveyed fluid. It is widely used in fluid conveying industries such as petroleum, chemical and food at home and abroad.

[0003] Chinese application ZL201910433691.7 discloses a vaned disc pump impeller. This disc pump impeller features several different rib (or blade) structures. The arc-shaped blades feature a smooth cross-section, minimizing the contact angle between the material and the blades during transport. This reduces cutting damage to the material. The staggered arc-shaped blades of varying lengths improve the disc pump's cavitation resistance and hydraulic performance without compromising flow efficiency. The spike-shaped blades also significantly protect the integrity of the material while maintaining minimal impact on transport efficiency.

[0004] The disc pump blade structure disclosed in Chinese application ZL201910433691.7 can improve the impact of flowing material on the impeller and the pump's hydraulic performance. However, at high impeller speeds, large cavitation (or cavitation) areas still appear in the middle of the blades and behind the connecting column. These cavitation areas reduce the pump's delivery pressure and delivery stability. Therefore, it is necessary to design a straight-blade disc pump structure that is resistant to cavitation (or cavitation) to expand the pump's application range. Summary of the Invention

[0005] The main purpose of the present invention is to solve the problem of decreased delivery capacity and increased delivery instability caused by cavitation (or cavitation) at high speeds during the fluid conveying process of a disc pump. A cavitation-resistant straight-blade disc pump impeller is proposed, which mainly improves its cavitation (or cavitation) resistance by designing a special disc pump blade shape and connecting column shape.

[0006] To achieve the above object, the present invention adopts the following technical solutions: A cavitation-resistant straight-blade disc pump impeller includes a front cover plate constituting the impeller and a rear cover plate located opposite the front cover plate. The bottom surface of the front cover plate is provided with front cover plate blades, the top surface of the rear cover plate is provided with rear cover plate blades, and the front cover plate and the rear cover plate are fixedly connected by eight groups of circumferentially distributed connecting columns; each group of connecting columns is located at one fifth of the outer side of the radius of the front cover plate wheel cover; the connecting columns adopt a streamlined composite geometric structure and are in the shape of a water droplet.

[0007] Furthermore, the cross-sections of the front cover blades and the rear cover blades are gradually arc-shaped, and the radius of the arc gradually increases from the center of the blade to the periphery of the blade.

[0008] Furthermore, the thickness of the front cover blade and the rear cover blade decreases in an arc shape from right to left.

[0009] Furthermore, the thickness of the front cover blade and the rear cover blade decreases uniformly in a straight line from right to left.

[0010] Furthermore, the left and right ends of the front cover blade and the rear cover blade are arc-shaped or straight-line-shaped.

[0011] Furthermore, the number of the front cover blades and the rear cover blades is 6-8.

[0012] Furthermore, the composite geometric structure of the connecting column is composed of a cylindrical segment and a conical segment seamlessly connected or a cylindrical segment and a triangular prism segment seamlessly connected.

[0013] The advantages and positive effects of the present invention are: The thickness of the arc blades varies uniformly, so when transporting material, the flow area behind the blades also changes uniformly, without sudden expansion or contraction. As a result, turbulence and eddy losses are significantly reduced. By utilizing the uniform throttling effect of a uniformly increased flow area, the impeller's cavitation resistance is improved compared to traditional straight-bladed disc pumps, and the impeller's hydraulic efficiency is also enhanced. At the same time, by adopting a composite structure with seamlessly connected cylindrical and conical sections at the connecting column, the turbulence intensity and pressure loss at the trailing edge are greatly reduced, and cavitation resistance is also improved. This reduces the scope and intensity of cavitation within the impeller at higher speeds, improving the impeller's hydraulic efficiency when conveying the working medium. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 1 is a schematic diagram of the overall structure of the disc pump impeller according to the first embodiment of the present invention; Figure 2 is a top view of the disc pump impeller of the first embodiment of the present invention; Figure 3 is a side view of the disc pump impeller of the first embodiment of the present invention; Figure 41 is a top view of the rear cover plate of the disc pump impeller according to the first embodiment of the present invention; Figure 5 is an axial cross-sectional view of the disc pump impeller of the first embodiment of the present invention; Figure 6 1. It is a bottom view of the rear cover plate of the disc pump impeller according to the first embodiment of the present invention; Figure 7 Schematic diagram of the rear cover structure of the disc pump impeller in the second embodiment of the present invention; Figure 8 Schematic diagram of the blade structure of the disc pump impeller according to the second embodiment of the present invention; Figure 9 Schematic diagram of the coupling column structure of the disc pump impeller in the second embodiment of the present invention; Figure 10 Schematic diagram of the overall structure of the disc pump impeller of the second embodiment of the present invention; Figure 11 1 is a top view of the rear cover plate of the disc pump impeller according to the second embodiment of the present invention; Figure 12 Schematic diagram of the rear cover structure of the disc pump impeller in the second embodiment of the present invention; Figure 13 2 is a schematic structural diagram of a front cover plate of a disc pump impeller according to a second embodiment of the present invention; Figure 14 is a top view of the front cover plate of the disc pump impeller of the second embodiment of the present invention; Figure 15 Schematic diagram of the blade structure of the disc pump impeller according to the second embodiment of the present invention; Figure 16 This is a diagram showing the variation of blade thickness of the disc pump impeller according to the second embodiment of the present invention.

[0015] Figure markings: 1-front cover plate, 2-balancing hole, 3-rear cover plate, 4-front cover plate blades, 5-hub, 6-rear cover plate blades, 7-connecting column, 8-shaft hole, 9-keyway. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0017] The application principle of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0018] Implementation List 1 Please refer to Figures 1-6A cavitation-resistant straight-blade disc pump impeller includes a front cover plate 1 and a rear cover plate 3 positioned opposite the front cover plate 1. The front and rear cover plates 1 and 3 are connected and fixed by eight circumferentially arranged groups of connecting posts 7, each group of connecting posts 7 being located at one-fifth of the outer radius of the inner side of the front cover plate. The connecting posts 7 utilize a streamlined composite geometric structure consisting of a seamlessly connected cylindrical and conical section, or a seamlessly connected cylindrical and triangular prism section, presenting a fluid-dynamic teardrop shape. The cross-sectional area of the connecting posts 7 gradually decreases from the cylindrical section to the conical or triangular prism section, gradually reducing pressure and avoiding turbulence caused by a rapid pressure drop, thereby improving cavitation resistance.

[0019] The bottom surface of the front cover plate 1 is provided with 6 to 8 circular arc-shaped front cover plate blades 4 arranged in a circumferential direction.

[0020] The top surface of the rear cover plate 3 is provided with 6-8 rear cover plate blades 6 similar to the front cover plate blades 4. The rear cover plate 3 is provided with a balancing hole 2 for balancing the axial force. A hub 5 connected to the output shaft of the motor is provided in the middle position of the rear cover plate 3. The balancing hole 2 on the rear cover plate 3 is used to balance the axial force generated when the impeller is working, reduce the wear of the bearing end face and the wear of the thrust plate, protect the bearing and the thrust plate, and control the pump pressure. The hub 5 is designed to cooperate with the rotating shaft of the motor. An axial hole 8 is provided on the hub 5, which is connected to the output shaft of the motor through the axial hole 8 to realize the connection between the hub 5 and the motor. A keyway 9 begins on the side of the hub 5, and the keyway 9 is used to realize the connection between the hub 5 and the key.

[0021] The cross-section of the front shroud blades 4 and rear shroud blades 6 is a tapered arc, with the radius of each arc increasing gradually from the center to the periphery. The thickness of each front shroud blade 4 and rear shroud blade 6 decreases in an arc shape from right to left, and the left and right ends of the front shroud blades 4 and rear shroud blade 6 are straight lines. The rear shroud blades 6 on the rear shroud 3 are similar to the front shroud blades 4, except that the tapered length is shorter.

[0022] Example 2 Please refer to Figure 7-Figure 16 The difference between Example 2 and Example 1 is that the thickness of the front cover blade 4 and the rear cover blade 6 decreases linearly from right to left, and the left and right ends of the front cover blade 4 and the rear cover blade 6 are arc-shaped; the rear cover blade 6 on the rear cover 3 is similar to the front cover blade 4, but the gradient length is shorter.

[0023] The rest of the structure is the same as that of the first embodiment and will not be described in detail here.

[0024] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A straight blade disc pump impeller with cavitation resistance, characterized in that: It includes a front cover plate constituting the impeller and a rear cover plate located opposite to the front cover plate. The bottom surface of the front cover plate is provided with front cover plate blades, the top surface of the rear cover plate is provided with rear cover plate blades, and the front cover plate and the rear cover plate are fixedly connected by 8 groups of circumferentially distributed connecting columns; each group of connecting columns is located at one fifth of the outer side of the radius of the front cover plate wheel cover; the connecting columns adopt a streamlined composite geometric structure and are in the shape of a water droplet.

2. The anti-cavitation straight blade disc pump impeller according to claim 1, characterized in that: The cross sections of the front cover blade and the rear cover blade are in a gradual arc shape, and the radius of the arc gradually increases from the center of the blade to the periphery of the blade.

3. The anti-cavitation straight blade disc pump impeller according to claim 1 or 2, characterized in that: The thickness of the front cover blade and the rear cover blade decreases in an arc shape from right to left.

4. The anti-cavitation straight blade disc pump impeller according to claim 1 or 2, characterized in that: The thickness of the front cover blade and the rear cover blade decreases uniformly from right to left in a straight line.

5. The anti-cavitation straight blade disc pump impeller according to claim 1 or 2, characterized in that: The left and right ends of the front cover blade and the rear cover blade are in arc shape or straight line shape.

6. The anti-cavitation straight blade disc pump impeller according to claim 1, characterized in that: The number of the front cover blades and the rear cover blades is 6-8.

7. The anti-cavitation straight blade disc pump impeller according to claim 1, characterized in that: The composite geometric structure of the connecting column is composed of a cylindrical segment and a conical segment seamlessly connected or a cylindrical segment and a triangular prism segment seamlessly connected.

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