Magnetic suspension impeller structure capable of inhibiting floating

Abstract

The utility model relates to the technical field of magnetic suspension bearingless pumps, in particular to a magnetic suspension impeller structure capable of restraining floating, a buoyancy groove is arranged on the side wall of an impeller, the buoyancy groove comprises a first side wall and a second side wall which are oppositely arranged, and the first side wall and / or the second side wall incline / inclines along the rotation direction of the impeller from top to bottom. In other words, the first side wall and / or the second side wall are / is subjected to downward acting force of fluid in the rotating process, and the multiple buoyancy grooves are evenly distributed in the circumferential direction of the impeller. The buoyancy grooves are formed in the side edges of the impeller, the side walls of the grooves generate obliquely upward force on fluid, then the impeller is subjected to obliquely downward counter-acting force from the fluid, downward component force of the counter-acting force in the vertical direction is continuously increased along with increase of the rotating speed of the impeller, and therefore the continuously enhanced restraining effect on floating of the impeller is achieved; the upper limit of the rotating speed of the magnetic suspension bearingless pump caused by upward floating of the impeller is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of magnetic suspension bearingless pumps, in particular to a magnetic suspension impeller structure capable of suppressing floating. Background Art

[0002] For a magnetically levitated bearingless centrifugal pump, as the speed increases, the rotor will float up synchronously. If the speed is too high, the rotor will float up and hit the wall, causing instability and shutdown. Therefore, all types of magnetically levitated bearingless pumps currently have an upper speed limit due to this reason, which in turn affects the maximum flow rate of the pump. Utility Model Content

[0003] The utility model aims to solve the above problems and provides a magnetic suspension impeller structure capable of suppressing floating. The technical solution adopted is as follows:

[0004] A magnetically suspended impeller structure capable of suppressing floating, wherein a buoyancy groove is arranged on the side wall of the impeller, wherein the buoyancy groove comprises a first side wall and a second side wall which are arranged opposite to each other, wherein the first side wall and / or the second side wall are inclined from top to bottom along the rotation direction of the impeller, so that the first side wall and / or the second side wall are subjected to a downward force of the fluid during rotation, and the number of the buoyancy grooves is multiple and evenly distributed along the circumference of the impeller.

[0005] On the basis of the above solution, the upper end of the buoyancy groove extends to the upper edge of the impeller, and the lower end of the buoyancy groove extends to the lower edge of the impeller.

[0006] Preferably, the first side wall and the second side wall are symmetrically arranged with respect to the vertical direction.

[0007] Preferably, the first side wall and / or the second side wall is arc-shaped.

[0008] Based on the above solution, the arc-shaped opening faces toward or away from the center of the buoyancy tank.

[0009] Preferably, when the impeller speed is constant, the buoyancy groove depth is positively correlated with the gap width between the impeller and the motor housing.

[0010] Preferably, the number and depth of the buoyancy grooves are positively correlated with the impeller rotation speed.

[0011] Preferably, the impeller is provided with flow openings, and the number of the flow openings is multiple and interconnected.

[0012] Preferably, the impeller is provided with blades.

[0013] The beneficial effects of the utility model are as follows: by arranging a buoyancy groove on the side of the impeller, the side wall of the groove generates an oblique upward force on the fluid, thereby causing the impeller to be subjected to an oblique downward reaction force from the fluid. As the impeller speed increases, the downward component of the reaction force in the vertical direction continues to increase, thereby continuously enhancing the inhibitory effect on the buoyancy of the impeller, thereby increasing the upper limit of the speed of the magnetic levitation bearingless pump caused by the buoyancy of the impeller. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 : Schematic diagram of the appearance structure of the utility model;

[0015] Figure 2 : Side view of the utility model;

[0016] Figure 3 : A top view of the position relationship between the impeller and the motor housing of the utility model;

[0017] Figure 4 : Schematic diagram of the structure of embodiment 2 of the utility model;

[0018] Figure 5 : Side view of embodiment 2 of the utility model;

[0019] Figure 6 : Schematic diagram of the structure of embodiment 3 of the utility model;

[0020] Figure 7 : Side view of embodiment 3 of the utility model. DETAILED DESCRIPTION

[0021] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0022] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] In the description of the present utility model, it should be understood that the terms "center", "length", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0024] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0025] Example 1

[0026] like Figures 1 to 3 As shown, a magnetic levitation impeller structure capable of suppressing buoyancy is provided, a buoyancy groove 2 is provided on the side wall of the impeller 1, the buoyancy groove 2 includes a first side wall 21 and a second side wall 22 arranged opposite to each other, the first side wall 21 and / or the second side wall 22 are inclined from top to bottom along the rotation direction of the impeller 1, that is, the first side wall 21 and / or the second side wall 22 are subjected to a downward force of the fluid during the rotation process, and as the rotation speed of the impeller 1 increases, the downward force of the fluid on the impeller 1 continues to increase, thereby playing a continuously enhanced suppressing effect on the buoyancy of the impeller 1, so as to increase the upper limit of the rotation speed of the magnetic levitation bearingless pump caused by the buoyancy of the impeller.

[0027] There are multiple buoyancy grooves 2, which are evenly distributed along the circumference of the impeller 1, so as to ensure that the impeller 1 is subjected to balanced force and avoid tilting.

[0028] When the speed of the impeller 1 is constant, the depth of the buoyancy groove 2 is positively correlated with the gap width between the impeller 1 and the motor housing 5. The greater the depth of the buoyancy groove 2, the greater the force-bearing area of ​​the first side wall 21 and the second side wall 22, thereby increasing the force on the impeller 1.

[0029] The number and depth of the buoyancy grooves 2 are positively correlated with the rotational speed of the impeller 1. By increasing the number and depth of the buoyancy grooves 2, the force-bearing areas of the first side wall 21 and the second side wall 22 are increased, thereby increasing the force on the impeller 1 and improving the allowable rotational speed of the impeller 1.

[0030] Example 2

[0031] The improvement of this embodiment over embodiment 1 is that Figure 4 and Figure 5 As shown, the first side wall 21 and / or the second side wall 22 is arc-shaped, and the arc opening is facing toward or away from the center of the buoyancy tank 2. By adjusting the shape and direction of the arc, the force condition of the side wall is adjusted, and then the depth of the buoyancy tank 2 can be adjusted to have a linear or nonlinear relationship with the force magnitude.

[0032] Example 3

[0033] The improvement of this embodiment over embodiment 1 is that, Figure 6 and Figure 7 As shown, the first side wall 21 and the second side wall 22 are inclined in opposite directions, so that when the impeller 1 rotates in different directions, the side walls of the buoyancy tank 2 can be subjected to the downward force from the fluid, so as to suppress the buoyancy of the impeller 1 under different turning conditions.

[0034] Preferably, the first side wall 21 and the second side wall 22 are symmetrically arranged with respect to the vertical direction, so that the first side wall 21 and the second side wall 22 are subjected to the same force under the conditions of different directions and the same rotation speed.

[0035] Example 4

[0036] The improvement of this embodiment compared to Embodiment 1 is that the upper end of the buoyancy groove 2 extends to the upper edge of the impeller 1, and the lower end of the buoyancy groove 2 extends to the lower edge of the impeller 1, that is, the buoyancy groove 2 is a through groove connected to the outside world at both ends. On the one hand, it can reduce the difficulty of processing. On the other hand, if there are substances such as biological cells in the fluid, the through groove structure can make the cells flow into the outside world along the buoyancy groove 2 without being damaged by the blocking part at the end of the buoyancy groove 2.

[0037] Example 5

[0038] like Figure 1 and Figure 4 As shown, the impeller 1 described in Examples 1 to 4 is provided with a flow channel opening 3, and the number of the flow channel openings 3 is multiple and interconnected, so that the impeller 1 meets the transmission needs of the magnetic levitation bearingless pump and is applied to the fields of biomedical research, medical equipment and semiconductor manufacturing.

[0039] Example 6

[0040] like Figure 6and Figure 7 As shown, the impeller 1 described in embodiments 1 to 4 is provided with blades 4, so that the impeller 1 can be used in a stirring device.

[0041] The present invention is described above by way of examples, but the present invention is not limited to the above specific embodiments, and any changes or modifications based on the present invention belong to the scope of protection required by the present invention.

Claims

1. A magnetically suspended impeller structure capable of suppressing floating, characterized in that: A buoyancy groove (2) is arranged on the side wall of the impeller (1), and the buoyancy groove (2) comprises a first side wall (21) and a second side wall (22) arranged opposite to each other, and the first side wall (21) and / or the second side wall (22) are inclined from top to bottom along the rotation direction of the impeller (1), that is, the first side wall (21) and / or the second side wall (22) are subjected to a downward force of the fluid during the rotation process, and the number of the buoyancy grooves (2) is multiple and evenly distributed along the circumference of the impeller (1).

2. A magnetically suspended impeller structure capable of suppressing floating according to claim 1, characterized in that: The upper end of the buoyancy groove (2) extends to the upper edge of the impeller (1), and the lower end of the buoyancy groove (2) extends to the lower edge of the impeller (1).

3. The magnetic suspension impeller structure capable of suppressing floating according to claim 1, characterized in that: The first side wall (21) and the second side wall (22) are arranged symmetrically with respect to the vertical direction.

4. The magnetic suspension impeller structure capable of suppressing floating according to claim 1, characterized in that: The first side wall (21) and / or the second side wall (22) are arc-shaped.

5. A magnetically suspended impeller structure capable of suppressing floating according to claim 4, characterized in that: The arc-shaped opening faces towards or away from the center of the buoyancy tank (2).

6. The magnetic suspension impeller structure capable of suppressing floating according to claim 1, characterized in that: When the rotation speed of the impeller (1) is constant, the depth of the buoyancy groove (2) is positively correlated with the width of the gap between the impeller (1) and the motor housing (5).

7. The magnetic suspension impeller structure capable of suppressing floating according to claim 1, characterized in that: The number and depth of the buoyancy grooves (2) are positively correlated with the rotation speed of the impeller (1).

8. The magnetic suspension impeller structure capable of suppressing floating according to claim 1, characterized in that: The impeller (1) is provided with flow passage openings (3), and the number of the flow passage openings (3) is multiple and interconnected.

9. The magnetic suspension impeller structure capable of suppressing floating according to claim 1, characterized in that: The impeller (1) is provided with blades (4).

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