Centrifugal pump without wear pads

Abstract

The utility model provides a kind of centrifugal pump without wear pad, including pump body, stator and rotor, stator is fixed in pump body, rotor is also installed in pump body, rotor can rotate relative to pump body and stator, magnetic ring is equipped on rotor, magnetic ring is opposite to stator, shaft is equipped with in the axial center of rotor, stator and the magnetic ring on rotor mutually attract;The gap between the upper end and lower end of rotor and pump body has gap. By the mutual attraction of stator and magnetic ring, stable axial positioning can be formed to the rotor, without relying on graphite shaft sleeve and wear pad, direct friction between rotor and pump body can be avoided, gap cooperation avoids contact to reduce mechanical wear, not only solve the wear problem caused by the size limitation of micro centrifugal pump without wear pad structure, but also eliminate the source of graphite powder, avoid the risk of rotor jamming, without graphite shaft sleeve and wear pad, reduce the cost and reduce assembly steps.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal pump technology, and in particular to a centrifugal pump that does not require wear-resistant gaskets. Background Technology

[0002] Centrifugal pumps operate by using the rotation of an impeller to cause the liquid medium to move centrifugally. The basic structure of a centrifugal pump consists of an impeller, pump body, pump shaft, bearings, sealing rings, and stuffing box. Existing centrifugal pumps are driven by an electric motor; specifically, the motor shaft is connected to the centrifugal pump shaft via a coupling and bearing housing, and the motor's operation drives the centrifugal pump.

[0003] The use of a graphite bushing 1 in conjunction with upper and lower wear-resistant gaskets 2 (such as ceramic) in a centrifugal pump rotor is a common design to limit the axial movement of the centrifugal pump rotor. Figure 1 As shown, it achieves superior performance in wear resistance, corrosion resistance, and high temperature resistance at a relatively higher cost. However, in this design, the graphite bushing and the centrifugal pump will rub against each other during operation, thus generating graphite powder during wear. This powder may fill the space between the ceramic gasket and the graphite bushing, causing the rotor to seize up. Utility Model Content

[0004] To address the aforementioned problems, the purpose of this invention is to provide a centrifugal pump that does not require wear-resistant gaskets.

[0005] This utility model is achieved by the following method: a centrifugal pump that does not require wear-resistant gaskets, comprising a pump body, a stator, and a rotor. The stator is fixed in the pump body, and the rotor is also installed in the pump body. The rotor can rotate relative to the pump body and the stator. A magnetic ring is provided on the rotor, and the magnetic ring is opposite to the stator. A rotating shaft passes through the center of the rotor. The stator and the magnetic ring on the rotor attract each other. There are gaps between the upper and lower ends of the rotor and the pump body.

[0006] Preferably, the pump body includes a housing and a pump cover, the pump cover and the stator are fixed inside the housing, the rotor is installed in the housing, and the pump cover is attached to the housing; the upper end of the rotor is clearance-fitted with the pump cover, and the lower end of the rotor is clearance-fitted with the lower end face inside the housing.

[0007] Preferably, one end of the rotating shaft abuts against a groove in the pump cover, and the other end of the rotating shaft abuts against a groove in the housing.

[0008] Preferably, a sealing ring is provided between the housing and the pump cover.

[0009] Preferably, the magnetic ring is fixed to the outer circumferential surface of the rotor.

[0010] Preferably, the stator is made of a material that can attract the magnetic ring.

[0011] Preferably, the stator comprises multiple silicon steel sheets, which attract each other to the magnetic ring.

[0012] The beneficial effects of this utility model are as follows: This utility model provides a centrifugal pump that does not require wear-resistant gaskets. Compared with the prior art, this utility model has at least the following technical effects: 1. Through the mutual attraction between the stator and the magnetic ring, a stable axial positioning of the rotor can be formed. Direct friction between the rotor and the pump body can be avoided without relying on graphite bushings and wear-resistant gaskets. This not only solves the wear problem caused by the inability to install wear-resistant gasket structures due to size limitations in micro centrifugal pumps, but also eliminates the source of graphite powder generation, avoiding the risk of rotor jamming. The elimination of graphite bushings and wear-resistant gaskets reduces costs and assembly steps. The clearance fit design further avoids rigid contact between the rotor and the pump cover and housing during operation, reducing mechanical wear and extending the service life of the rotor and pump body. 2. Silicon steel sheets have excellent magnetic permeability. When combined with the magnetic ring, they can enhance the attraction between the stator and the magnetic ring, further improving the stability of the rotor's axial positioning. This ensures that the rotor maintains a precise rotation trajectory during high-speed operation, reducing vibration and noise, and improving the smoothness of centrifugal pump operation. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of an existing centrifugal pump.

[0014] Figure 2 This is a schematic diagram of the structure of a centrifugal pump that does not require wear-resistant gaskets according to this utility model.

[0015] Figure 3 This is a schematic diagram showing the relative positional relationship between the stator and rotor of this utility model.

[0016] Figure 4 This is a schematic diagram showing the state of the gap between the upper end of the rotor and the pump cover in this utility model.

[0017] Figure 5 This is a schematic diagram showing the state of the gap between the lower end of the rotor and the housing in this utility model.

[0018] The reference numerals in the attached diagram are as follows: 1. Gasket; 2. Graphite bushing; 3. Pump body; 31. Housing; 32. Pump cover; 4. Stator; 5. Rotor; 6. Magnetic ring; 7. Shaft; 8. Sealing ring. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0020] Please see Figures 2 to 5A centrifugal pump without wear-resistant gaskets includes a pump body 3, a stator 4, and a rotor 5. The stator 4 is fixed within the pump body 3, and the rotor 5 is also installed within the pump body 3. The rotor 5 is rotatable relative to the pump body 3 and the stator 4. A magnetic ring 6 is provided on the rotor 5, and the magnetic ring 6 is opposite to the stator 4. A rotating shaft 7 passes through the axis of the rotor 5. The stator 4 and the magnetic ring 6 on the rotor 5 attract each other. Through the mutual attraction between the stator 4 and the magnetic ring 6, a stable axial positioning of the rotor 5 can be formed. Direct friction between the rotor 5 and the pump body 3 can be avoided without relying on graphite bushings 2 and wear-resistant gaskets 1. This not only solves the wear problem caused by the inability to install wear-resistant gaskets 1 due to size limitations in micro centrifugal pumps, but also eliminates the source of graphite powder generation, avoiding the risk of rotor 5 jamming. Eliminating the need for graphite bushings 2 and wear-resistant gaskets 1 reduces costs and assembly steps. There are gaps between the upper and lower ends of the rotor 5 and the pump body 3. The clearance fit design avoids friction between the rotor 5 and the pump body 3 during operation, reduces mechanical wear, and extends the service life of the rotor 5 and the pump body 3.

[0021] Please see Figure 2 , Figure 4 , Figure 5 Preferably, the pump body 3 includes a housing 31 and a pump cover 32. The pump cover 32 is fixed to the stator 4 within the housing 31, and the rotor 5 is installed within the housing 31. The pump cover 32 covers the housing 31. The upper end of the rotor 5 is clearance-fitted with the pump cover 32, and the lower end of the rotor 5 is clearance-fitted with the lower end face inside the housing 31. This clearance-fit design avoids rigid contact between the rotor 5 and the pump cover 32 and housing 31 during operation, reducing mechanical wear and extending the service life of the rotor 5 and the pump body 3.

[0022] Please see Figure 2 , Figure 4 , Figure 5 Preferably, one end of the rotating shaft 7 abuts against a groove in the pump cover 32, and the other end of the rotating shaft 7 abuts against a groove in the housing 31. The upper end face of the rotating shaft 7 abuts against the bottom of the clearance hole in the middle of the pump cover 32, and the lower end face of the rotating shaft 7 abuts against the positioning groove on the lower end face of the housing 31.

[0023] Please see Figure 2 Preferably, a sealing ring 8 is provided between the housing 31 and the pump cover 32. This enhances the sealing performance of the pump body 3 and prevents liquid leakage.

[0024] Please see Figure 2 , Figure 3 , Figure 5Preferably, the magnetic ring 6 is fixed to the outer circumferential surface of the rotor 5. Specifically, an annular mounting groove is formed along the axial direction on the outer circumferential surface of the rotor 5, and the magnetic ring 6 is embedded in the mounting groove. The outer circumferential surface of the magnetic ring 6 is flush with the outer circumferential surface of the rotor 5 (to avoid the magnetic ring 6 protruding and causing friction with the pump body 3). The axial length of the magnetic ring 6 is 1 / 2 to 2 / 3 of the axial length of the rotor 5, ensuring that a sufficient attraction area is formed with the stator 4. This makes the relative area between the magnetic ring 6 and the stator 4 larger, the attraction stronger, and improves the positioning stability of the rotor 5.

[0025] Preferably, the stator 4 is made of a material that can attract the magnetic ring 6, such as iron, cobalt, or nickel. The stator 4 comprises multiple silicon steel sheets, which can attract each other well with the magnetic ring 6. This helps to prevent axial movement of the rotor 5.

[0026] The working principle of this utility model is as follows: The magnetic rings 6 on the outer circumferences of the stator 4 and rotor 5 attract each other, preventing axial movement of the rotor 5 and ensuring that the rotor 5 always rotates along a fixed axis, thus avoiding contact friction between the rotor 5 and the pump body 3 (pump body 3 main body and pump cover 32). Simultaneously, the clearance fit between the upper end of the rotor 5 and the pump cover 32, and between the lower end of the rotor 5 and the lower inner end face of the pump body 3 main body, provides ample space for the rotor 5 to rotate, preventing friction between the rotor 5 and the pump body 3 during rotation and further reducing mechanical wear. This structure eliminates the need for graphite bushings 2 and upper and lower wear-resistant gaskets 1, making it ideal for micro centrifugal pumps where there is limited space to design graphite bushings 2 with upper and lower wear-resistant gaskets 1, saving on material and assembly costs.

[0027] Several points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection" and "linkage" should be interpreted broadly, and can be mechanical or electrical connection, or internal connection between two components, or direct connection. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationship. When the absolute position of the described object changes, the relative positional relationship may change.

[0028] Secondly: The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.

[0029] Finally, the above description is only a preferred embodiment of the present utility model. The protection scope of the present utility model is not limited to the above embodiments. All technical solutions that fall within the scope of the present utility model are protected by the present utility model.

[0030] It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of this utility model should also be considered within the scope of protection of this utility model.

Claims

1. A centrifugal pump that does not require wear-resistant gaskets, comprising a pump body, a stator, and a rotor, characterized in that: The stator is fixed in the pump body, and the rotor is also installed in the pump body. The rotor can rotate relative to the pump body and the stator. The rotor is provided with a magnetic ring, which is opposite to the stator. A rotating shaft passes through the center of the rotor. The stator and the magnetic ring on the rotor attract each other. There are gaps between the upper and lower ends of the rotor and the pump body.

2. A centrifugal pump without wear-resistant gaskets according to claim 1, characterized in that: The pump body includes a housing and a pump cover. The pump cover and the stator are fixed inside the housing. The rotor is installed in the housing. The pump cover is attached to the housing. The upper end of the rotor is clearance-fitted with the pump cover. The lower end of the rotor is clearance-fitted with the lower end face inside the housing.

3. A centrifugal pump without wear-resistant gaskets according to claim 2, characterized in that: One end of the rotating shaft abuts against a groove in the pump cover, and the other end of the rotating shaft abuts against a groove in the housing.

4. A centrifugal pump without wear-resistant gaskets according to claim 3, characterized in that: A sealing ring is provided between the housing and the pump cover.

5. A centrifugal pump without wear-resistant gaskets according to claim 1, characterized in that: The magnetic ring is fixed to the outer circumferential surface of the rotor.

6. A centrifugal pump without wear-resistant gaskets according to claim 1, characterized in that: The stator is made of a material that can be attracted by a magnetic ring.

7. A centrifugal pump without wear-resistant gaskets according to claim 1, characterized in that: The stator comprises multiple silicon steel sheets, which attract each other to the magnetic ring.

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