Miniature centrifugal pump guide vane and processing method

Abstract

The application belongs to the technical field of centrifugal pumps, and provides a micro centrifugal pump guide vane and a processing method, which comprises a reverse guide vane and a positive guide vane. A plurality of welding connection assemblies are arranged on the positive guide vane, the positive guide vane is fixedly connected with the reverse guide vane in the coaxial direction through the plurality of welding connection assemblies, and a welding positioning piece is arranged on the reverse guide vane, which is used for making the reverse guide vane and the positive guide vane on the same axis. The welding connection assembly comprises a plurality of welding holes arranged on the positive guide vane and a plurality of welding points arranged on the reverse guide vane, and the plurality of welding points are arranged in correspondence with the plurality of welding holes. The guide vane is divided into the positive guide vane and the reverse guide vane, which are processed and formed respectively and welded, so that the problem of inconvenient casting processing of the micro flow channel is solved, and the accuracy of the guide vane processing size is ensured through the mode of reserving the welding positioning piece and the processing allowance.

Description

Technical Field

[0001] This invention belongs to the field of centrifugal pump technology, and particularly relates to a guide vane for a micro centrifugal pump and its processing method. Background Technology

[0002] Miniature centrifugal pumps, typically magnetic drive pumps and canned motor pumps, are widely used in critical fields such as aerospace. They generally feature low flow rates and high head, often achieved through multi-stage impellers and high rotational speeds, resulting in small size, light weight, and high pressure. Guide vanes, used to guide the flow between these multi-stage impellers, are indispensable components. While standard-sized guide vanes are machined by casting, miniature guide vanes are too small, with flow channel widths sometimes as small as 1mm, making casting impossible. Although 3D printing can achieve this, 3D-printed flow channels have high roughness, high flow resistance, and low energy efficiency. Summary of the Invention

[0003] The purpose of this invention is to provide a micro centrifugal pump guide vane and its processing method to solve the above-mentioned problems, thereby solving the problems of difficult casting of micro guide vanes and rough flow channels in 3D printing, and achieving the goal of smooth flow channels and precise processing.

[0004] To achieve the above objectives, the present invention provides the following solution: a miniature centrifugal pump guide vane, comprising: The system includes a reverse guide vane and a forward guide vane. The forward guide vane is provided with multiple welded connection components. The forward guide vane is fixedly connected to the reverse guide vane coaxially through the multiple welded connection components. The reverse guide vane is provided with a welded positioning component, which is used to keep the reverse guide vane and the forward guide vane on the same axis. The welding connection assembly includes multiple welding holes formed on the positive guide vane and multiple welding points disposed on the negative guide vane, with the multiple welding points corresponding to the multiple welding holes respectively.

[0005] Preferably, the plurality of solder joints include an outer solder joint and an inner solder joint, the plurality of outer solder joints on the anti-missile blade are respectively located on the same outer solder joint positioning circle, and the plurality of inner solder joints on the anti-missile blade are respectively located on the same inner solder joint positioning circle.

[0006] Preferably, the plurality of outer weld points are equally spaced on the outer weld point positioning circle, and the plurality of inner weld points are equally spaced on the inner weld point positioning circle.

[0007] Preferably, the reverse guide vane has multiple blades fixedly connected at equal intervals on the side near the positive guide vane, the blades are in contact with the positive guide vane, and the outer and inner weld points are provided on the blades.

[0008] Preferably, along the axial direction of the anti-guide blade, the blade covers a plurality of the weld holes.

[0009] Preferably, the welding positioning component includes a welding positioning ring, which is fixedly connected to the side of the reverse guide vane near the positive guide vane. The welding positioning ring is coaxially arranged with the reverse guide vane, and the positive guide vane is correspondingly arranged with the inner side of the welding positioning ring.

[0010] Preferably, a forward flow cavity is provided inside the forward guide vane, and a reverse flow cavity is provided between the forward guide vane and the reverse guide vane.

[0011] A method for manufacturing guide vanes for a miniature centrifugal pump includes the following steps: The reverse guide vane and the forward guide vane are machined separately. A welding positioning ring is machined on the reverse guide vane, and a welding hole is machined on the forward guide vane. The positive guide vane is placed into the welding positioning ring, and the positive guide vane and the negative guide vane are welded together through the welding hole to form a guide vane semi-finished product. Machining guide vane semi-finished products to form finished guide vane products.

[0012] Preferably, after the positive guide vane and the negative guide vane are welded together, the weld points at the multiple weld holes are processed to be flat.

[0013] Preferably, before the positive and negative guide vanes are welded together, the dimensions of the positioning circle and outer circle on the positive and negative guide vanes are larger than the design dimensions of the finished guide vane.

[0014] Compared with the prior art, the present invention has the following advantages and technical effects: The present invention divides the guide vane into two parts, a positive guide vane and a negative guide vane, which are machined separately to ensure a smooth flow channel and reduce flow loss. At the same time, the positive and negative guide vanes are welded together to form the required micro centrifugal pump guide vane, which solves the problem of the inconvenience of casting and machining the micro-flow channel. The accuracy of the guide vane machining dimensions is ensured by reserving welding positioning parts and machining allowances. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the centrifugal pump guide vane of the present invention; Figure 2 This is a cross-sectional schematic diagram of the centrifugal pump guide vane of the present invention; Figure 3 This is a schematic diagram of the positive guide vane of the present invention; Figure 4 This is a cross-sectional schematic diagram of the positive guide vane of the present invention; Figure 5This is a schematic diagram of the anti-guide vane of the present invention; Figure 6 This is a cross-sectional schematic diagram of the anti-missile blade of the present invention; Among them, 1. reverse guide vane; 2. forward guide vane; 3. blade; 4. weld hole; 5. welding positioning ring; 11. outer weld point positioning angle; 12. inner weld point positioning angle; 21. outer weld point positioning circle; 22. inner weld point positioning circle; 31. forward flow cavity; 32. reverse flow cavity; 41. positioning circle; 42. outer circle. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] Reference Figures 1-6 The present invention provides a miniature centrifugal pump guide vane, comprising: a reverse guide vane 1 and a forward guide vane 2. The forward guide vane 2 is provided with a plurality of welded connection components, and the forward guide vane 2 is fixedly connected to the reverse guide vane 1 coaxially through the plurality of welded connection components. The reverse guide vane 1 is provided with a welded positioning component, which is used to make the reverse guide vane 1 and the forward guide vane 2 on the same axis. The welding connection assembly includes multiple welding holes 4 opened on the positive guide vane 2 and multiple welding points set on the negative guide vane 1, with the multiple welding points corresponding to the multiple welding holes 4 respectively.

[0020] The reverse guide vane 1 and the forward guide vane 2 together form a complete centrifugal pump guide vane. Their main function is to provide welding positioning components to ensure the reverse guide vane and the forward guide vane are fixed coaxially. The forward guide vane 2 and the reverse guide vane 1 together form a complete guide vane. Their main function is to provide multiple welding connection components to achieve a coaxial fixed connection with the reverse guide vane. The weld hole 4 mainly functions to correspond with the weld point on the reverse guide vane 1 to form a welding connection position. The weld point mainly functions to correspond with the weld hole 4 on the forward guide vane 2, serving as a positioning and welding fixation. The welding positioning component mainly functions to ensure that the reverse guide vane 1 and the forward guide vane 2 are on the same axis, guaranteeing coaxiality. Overall, this invention divides the guide vane into two parts, the forward guide vane and the reverse guide vane, which are machined separately to ensure a smooth flow channel and reduce flow loss. Simultaneously, the forward and reverse guide vanes are welded together to form the required miniature centrifugal pump guide vane, solving the problem of inconvenient casting and machining of its micro-channels. The accuracy of the guide vane's machining dimensions is ensured by reserving welding positioning components and machining allowances.

[0021] The scheme is further optimized so that multiple solder joints include an outer solder joint and an inner solder joint. The multiple outer solder joints on the anti-missile blade 1 are located on the same outer solder joint positioning circle 21, and the multiple inner solder joints on the anti-missile blade 1 are located on the same inner solder joint positioning circle 22.

[0022] The scheme is further optimized so that multiple outer solder joints are evenly distributed on the outer solder joint positioning circle 21, and multiple inner solder joints are evenly distributed on the inner solder joint positioning circle 22.

[0023] like Figure 1 As shown, in this embodiment, the outer and inner weld points are respectively set with positioning angles based on the same baseline, namely the outer weld point positioning angle 11 and the inner weld point positioning angle 12. With the outer weld point positioning circle 21 and the inner weld point positioning circle 22, each outer weld point and inner weld point on the anti-missile blade 1 can be accurately positioned.

[0024] To further optimize the design, multiple blades 3 are fixedly connected at equal intervals on the side of the anti-guide blade 1 close to the positive guide blade 2. The blades 3 are attached to the positive guide blade 2, and the outer and inner welding points are set on the blades 3.

[0025] Further optimization of the design involves covering multiple weld holes 4 on the blade 3 along the axial direction of the anti-missile blade 1.

[0026] Since the guide vane in this embodiment is used for a micro centrifugal pump with a small flow rate, the blade 3 can be widened without affecting the fluid flow. The blade 3 is widened so that each blade 3 can sufficiently cover two weld points, namely the outer weld point and the inner weld point, in the axial direction of the pump blade. At the same time, weld holes 4 are opened on the guide vane 2 at the corresponding weld point positions of the blade 3. The diameter of the weld holes 4 must be smaller than the width of the blade 3.

[0027] The scheme is further optimized. The welding positioning component includes a welding positioning ring 5, which is fixedly connected to the side of the reverse guide vane 1 near the positive guide vane 2. The welding positioning ring 5 is coaxially arranged with the reverse guide vane 1, and the positive guide vane 2 is correspondingly arranged with the inner side of the welding positioning ring 5.

[0028] To further optimize the design, a forward flow cavity 31 is provided inside the forward guide vane 2, and a reverse flow cavity 32 is provided between the forward guide vane 2 and the reverse guide vane 1.

[0029] In this embodiment, the working principle of the micro centrifugal pump guide vane is as follows: Before operation, the micro pump management system is assembled, and the pump is filled with medium. After the pump motor is powered on and started, the guide vane operates. The fluid enters the forward guide vane 2 from the impeller, flows through the forward liquid flow chamber 31, is deflected, and then enters the reverse guide vane 1. It then enters the next stage impeller from the reverse liquid flow chamber 32 between the vanes 3, achieving the goal of fluid entering the next stage impeller from the previous stage impeller.

[0030] A method for manufacturing guide vanes for a miniature centrifugal pump includes the following steps: The reverse guide vane 1 and the forward guide vane 2 are machined separately. A welding positioning ring 5 is machined on the reverse guide vane 1, and a welding hole 4 is machined on the forward guide vane 2. Place the positive guide vane 2 into the welding positioning ring 5, and weld the positive guide vane 2 to the negative guide vane 1 through the welding hole 4 to form a guide vane semi-finished product. Machining guide vane semi-finished products to form finished guide vane products.

[0031] To further optimize the design, after the positive guide vane 2 and the negative guide vane 1 are welded together, the weld points at the multiple weld holes 4 are machined flat.

[0032] To further optimize the design, before welding the positive guide vane 2 and the negative guide vane 1, the dimensions of the positioning circle 41 and the outer circle 42 on the negative guide vane 1 and the positive guide vane 2 are larger than the design dimensions of the finished guide vane.

[0033] In this embodiment, the key dimensions of the positive guide vane 2 and the negative guide vane 1, namely the diameters of the positioning circle 41 and the outer circle 42, are designed with machining allowance. That is, the diameters of the positioning circle 41 and the outer circle 42 of the finished products of the positive guide vane 2 and the negative guide vane 1, which are machined separately, are larger than the diameter of the final guide vane product. This is to facilitate further machining after welding so that the final guide vane product dimensions meet the design requirements.

[0034] Specifically, the reverse guide vane 1 and the forward guide vane 2 are designed and manufactured independently. Before welding, a welding positioning ring 5 is machined on the reverse guide vane 1, and the positions of the outer and inner weld points are marked. Welding holes 4 are machined on the forward guide vane 2. After welding the forward guide vane 2 and the reverse guide vane 1 through the welding holes 4, the welding holes 4 are machined flat. Then, the welding positioning ring 5 is removed by turning, and the diameters of the positioning circle 41 and the outer circle 42 are machined to their final values ​​to complete the final machining of the miniature centrifugal pump guide vanes.

[0035] This embodiment solves the problem of inconvenient casting of microchannels in the pump blades of micro centrifugal pumps by separately machining and welding the positive guide vane 2 and the negative guide vane 1. By reserving machining allowances for the welding positioning ring 5, positioning circle 41, and outer circle 42, the accuracy of the machining dimensions of the guide vane is ensured through further machining.

[0036] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, 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 invention.

[0037] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A guide vane for a miniature centrifugal pump, characterized in that, include: The guide vane (1) and the guide vane (2) are provided with a plurality of welding connection components. The guide vane (2) is fixedly connected to the guide vane (1) on the same axis through the plurality of welding connection components. The guide vane (1) is provided with a welding positioning component. The welding positioning component is used to make the guide vane (1) and the guide vane (2) on the same axis. The welding connection assembly includes multiple welding holes (4) opened on the positive guide vane (2) and multiple welding points set on the reverse guide vane (1), with the multiple welding points respectively corresponding to the multiple welding holes (4).

2. The guide vane of a miniature centrifugal pump according to claim 1, characterized in that: The plurality of solder joints include an outer solder joint and an inner solder joint. The plurality of outer solder joints on the anti-guide blade (1) are respectively located on the same outer solder joint positioning circle (21), and the plurality of inner solder joints on the anti-guide blade (1) are respectively located on the same inner solder joint positioning circle (22).

3. The guide vane of a miniature centrifugal pump according to claim 2, characterized in that: Multiple outer weld points are equally spaced on the outer weld point positioning circle (21), and multiple inner weld points are equally spaced on the inner weld point positioning circle (22).

4. The guide vane of a miniature centrifugal pump according to claim 3, characterized in that: The reverse guide vane (1) has multiple blades (3) fixedly connected at equal intervals on one side close to the positive guide vane (2). The blades (3) are attached to the positive guide vane (2), and the outer and inner welding points are set on the blades (3).

5. The guide vane of a miniature centrifugal pump according to claim 4, characterized in that: Along the axial direction of the anti-guide blade (1), the blade (3) covers a plurality of the weld holes (4).

6. The guide vane of a miniature centrifugal pump according to claim 1, characterized in that: The welding positioning component includes a welding positioning ring (5), which is fixedly connected to the side of the reverse guide vane (1) near the positive guide vane (2). The welding positioning ring (5) is coaxially arranged with the reverse guide vane (1), and the positive guide vane (2) is correspondingly arranged with the inner side of the welding positioning ring (5).

7. The guide vane of a miniature centrifugal pump according to claim 1, characterized in that: The positive guide vane (2) is provided with a positive liquid flow cavity (31), and a reverse liquid flow cavity (32) is provided between the positive guide vane (2) and the reverse guide vane (1).

8. A method for processing a guide vane for a miniature centrifugal pump, used to process the guide vane for a miniature centrifugal pump as described in any one of claims 1-7, characterized in that, The following steps are included: The reverse guide vane (1) and the forward guide vane (2) are machined respectively. A welding positioning ring (5) is machined on the reverse guide vane (1) and a welding hole (4) is machined on the forward guide vane (2). Place the positive guide vane (2) into the welding positioning ring (5), and weld the positive guide vane (2) to the negative guide vane (1) through the welding hole (4) to form a guide vane semi-finished product; Machining guide vane semi-finished products to form finished guide vane products.

9. The method for processing a guide vane of a miniature centrifugal pump according to claim 8, characterized in that: After the positive guide vane (2) and the negative guide vane (1) are welded together, the weld points at the multiple weld holes (4) are processed to be flat.

10. A method for processing guide vanes of a micro centrifugal pump according to claim 8, characterized in that: Before the positive guide vane (2) and the negative guide vane (1) are welded together, the dimensions of the positioning circle (41) and the outer circle (42) on the negative guide vane (1) and the positive guide vane (2) are larger than the design dimensions of the finished guide vane.

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