Magnetic drive pump capable of performing dry operation

Abstract

The invention relates to the technical field of pump equipment, in particular to a dry-running magnetic drive pump which comprises a pump body, an impeller, a driven shaft, a driving shaft, a circulating cooling assembly, an inner magnetic rotor, a bracket, an isolation sleeve, an outer magnetic rotor, a bearing box and a circulating cooling assembly. The pump body, the bracket and the bearing box body are sequentially connected; the impeller and the driven shaft are both located in the cavity, one end of the driven shaft is connected with the impeller, and the other end of the driven shaft is connected with the inner magnetic rotor. One end, close to the driven shaft, of the driving shaft is connected with the outer magnetic rotor; the isolation sleeve is located between the inner magnetic rotor and the outer magnetic rotor, and the open end is connected with the pump body. The isolation sleeve comprises at least one layer, and a circulating cooling channel is arranged on the outer wall of the isolation sleeve or between the layers and communicated with the circulating cooling assembly. Heat is taken away through the cooling liquid, the temperature is reduced, internal and external pressure balance of the isolation sleeve is kept, the isolation sleeve is prevented from being damaged, and medium leakage is prevented.

Description

Technical Field

[0001] The invention relates to the technical field of pump equipment, and in particular to a magnetic pump capable of dry operation. Background Art

[0002] At present, the fully sealed, leak-free, corrosion-resistant magnetic drive centrifugal pump (magnetic pump) has become a conventional equipment widely used in the petrochemical, pharmaceutical energy, nuclear industry, environmental protection and other departments. It is widely used to transport various corrosive, flammable and explosive media and toxic media.

[0003] Magnetic Drive Pump is a device that uses the magnetic transmission principle of the inner and outer magnetic rotors to drive the pump. It transmits the rotational power of the drive motor to the pump impeller through the magnetic contactless transmission of the inner and outer magnetic rotors, thereby achieving complete isolation between the driving part of the pump and the transported medium. Therefore, it is particularly suitable for transporting flammable, explosive, toxic, corrosive or precious liquids.

[0004] During the use of the magnetic pump, a large amount of heat will be generated inside the pump body. The sources of this heat are mainly two aspects. On the one hand, it comes from the eddy current heat generated by the intersection of magnetic lines of force between the inner and outer magnetic rotors. On the other hand, it comes from the friction heat between the rotating shaft and the bearings. The heat generated by this causes the internal temperature of the magnetic pump to rise. Once the temperature is too high, the magnetic rotor will be demagnetized, causing the pump to fail to operate.

[0005] Usually, when the magnetic pump is operating normally, the inside of the pump is cooled by the medium, that is, during the circulation of the medium, the medium takes away the heat. However, once the magnetic pump is without medium due to some special reasons, such as blockage of the medium inlet, no liquid entering, failure to shut down the pump in time when unloading, etc., that is, the pump is in dry operation, the heat generated by magnetic coupling and other reasons cannot be taken away in time. This heat cannot be discharged, resulting in a sharp increase in the temperature inside the pump, and the inner and outer magnetic rotors are demagnetized due to the increase in temperature; at the same time, the isolation sleeve is easily damaged due to the pressure difference under the pressure inside the pump, resulting in medium leakage, and the medium leaking into the atmosphere causing air pollution; more serious accidents will cause the entire equipment to have a bigger accident, making the pump unable to run smoothly, shortening the operation cycle of the pump, and increasing the maintenance frequency.

[0006] Therefore, when the magnetic pump runs dry, how to effectively cool the pump body and ensure the smooth operation of the pump is an urgent problem to be solved. Summary of the invention

[0007] In order to solve the above technical problems existing in the prior art, the present invention provides a magnetic pump capable of dry operation.

[0008] The technical solution of the present invention to solve the above technical problems is as follows: The present invention provides a dry-running magnetic pump, comprising a pump body, an impeller, a driven shaft, a driving shaft, an inner magnetic rotor, a bracket, an isolating sleeve, an outer magnetic rotor, a bearing housing and a circulating cooling component; the pump body, the bracket and the bearing housing are connected in sequence; a cavity is provided inside the pump body, the impeller and the driven shaft are both located in the cavity, one end of the driven shaft is connected to the impeller, and the other end is connected to the inner magnetic rotor; the driving shaft is arranged in the bearing housing, and one end of the driving shaft close to the driven shaft is connected to the outer magnetic rotor; the isolating sleeve is located between the inner magnetic rotor and the outer magnetic rotor, and the open end of the isolating sleeve is connected to the pump body; the isolating sleeve comprises at least one layer, a circulating cooling channel is provided on the outer wall of the isolating sleeve or between each layer of the isolating sleeve, and the two ends of the circulating cooling channel are connected to the circulating cooling component.

[0009] By using the dry-running magnetic pump provided by the present invention, the coolant in the circulating cooling component circulates in the circulating cooling channel to take away the eddy current heat and other heat generated by the magnetic coupling between the inner magnetic rotor and the outer magnetic rotor, thereby avoiding the temperature in the pump from rising due to the heat generation and ensuring the smooth operation of the pump.

[0010] On the basis of the above technical solution, the present invention can also make the following improvements: Furthermore, it also includes a connecting frame, which is arranged at the connection between the bracket and the bearing box, the connecting frame is provided with an air inlet, and the bracket is provided with an air outlet, and the air inlet and the air outlet are both connected to the chamber between the isolation sleeve and the outer magnetic rotor.

[0011] The beneficial effect of adopting the above-mentioned further technical solution is that the air flow is introduced into the chamber between the isolation sleeve and the outer magnetic rotor through the air inlet and discharged through the air outlet, so that the eddy current heat is taken away in time, further avoiding the increase in temperature inside the pump, especially when the pump is running dry, the heat in the pump can be taken away in time and effectively, avoiding a sharp increase in temperature inside the pump.

[0012] Furthermore, the outer magnetic rotor is connected to the driving shaft via a connecting member, the connecting member includes a plurality of blades arranged at intervals, the blade includes a first end and a second end, the first end is connected to the driving shaft, and the second end is connected to the outer magnetic rotor.

[0013] The beneficial effect of adopting the above-mentioned further technical solution is that: the plurality of blades ensure the supporting connection strength of the external magnetic rotor; at the same time, the gaps between the blades provide a flow path for the airflow, and the airflow entering through the air inlet flows through the gaps between the blades into the chamber between the isolation sleeve and the external magnetic rotor, and is then discharged through the air outlet, thereby taking away the heat.

[0014] Furthermore, an airflow channel is provided between adjacent blades, and a cross-sectional area of ​​the airflow channel close to the first end is smaller than a cross-sectional area of ​​the airflow channel close to the second end.

[0015] The beneficial effect of adopting the above-mentioned further technical solution is that it guides the airflow, ensures that there is a difference in the airflow velocity in the chamber between the isolation sleeve and the external magnetic rotor, that is, the flow velocity is large near the center and the flow velocity is small away from the center, thereby ensuring effective cooling of the airflow and avoiding the airflow being discharged directly through the outlet without heat exchange and cooling.

[0016] Furthermore, the air outlet is opened at one end of the bracket close to the pump body.

[0017] The beneficial effect of adopting the above-mentioned further technical solution is that the air outlet is arranged away from the air inlet, ensuring that all or most of the airflow enters the chamber between the isolation sleeve and the external magnetic rotor after entering through the air inlet, effectively reducing the temperature in the pump body and avoiding the airflow from being discharged directly through the air outlet without entering the chamber between the isolation sleeve and the external magnetic rotor.

[0018] Furthermore, the isolation sleeve comprises an inner isolation sleeve and an outer isolation sleeve, and the circulating cooling channel is arranged between the inner isolation sleeve and the outer isolation sleeve.

[0019] The beneficial effect of adopting the above-mentioned further technical solution is that: the isolation sleeve adopts a sandwich design, which can provide a large-capacity circulating cooling channel to ensure timely and effective removal of eddy current heat; furthermore, the isolation sleeve with a sandwich design can improve the mechanical strength of the isolation sleeve, avoid damage to the isolation sleeve, and increase its service life.

[0020] Further, the circulating cooling component is communicated with the cavity.

[0021] The beneficial effect of adopting the above-mentioned further technical scheme is that the medium in the cavity is transported as a coolant to the circulating cooling channel to cool the isolation sleeve, and at the same time, the circulating cooling channel is connected to the cavity so that the inner and outer sides of the inner isolation sleeve are subjected to exactly the same pressure, which can better maintain the force balance on the inner and outer sides of the inner isolation sleeve, avoid damage to the inner and outer sides of the inner isolation sleeve due to excessive pressure difference, and prevent medium leakage; at the same time, the inner and outer sides of the inner isolation sleeve are subjected to balanced force and are not easy to be damaged, thereby reducing the thickness of the inner isolation sleeve, that is, the inner isolation sleeve adopts a thinning design, thereby reducing the generation of eddy heat; further, part of the medium in the cavity can be discharged, which can increase the circulation flow rate of the medium in the pump body cavity, thereby effectively improving the ability of the medium to carry away friction heat.

[0022] Furthermore, the circulating cooling component includes a medium storage tank, a medium channel and a connecting pipe. A liquid seal is provided in the medium storage tank, and the medium channel is connected to the liquid seal.

[0023] The beneficial effect of adopting the above-mentioned further technical solution is that when the pressure inside the inner isolation sleeve increases, the medium in the pump body cavity flows into the medium storage tank through the medium channel. Under the buffering effect of the upper gas and liquid seal in the medium storage tank, the pressure is more smoothly transmitted to the outside of the inner isolation sleeve, avoiding the sudden increase in pressure that may cause the inner isolation sleeve to be damaged by impact, thereby ensuring the pressure balance on both sides of the inner isolation sleeve.

[0024] Furthermore, the circulating cooling component includes a circulating liquid storage tank and a heat exchange mechanism. The circulating liquid storage tank is provided with a circulating liquid outlet and a circulating liquid inlet. The circulating liquid outlet and the circulating liquid inlet are respectively connected to two ends of the circulating cooling channel.

[0025] The beneficial effect of adopting the above-mentioned further technical solution is that the isolation sleeve is cooled by the coolant, and the heat exchange mechanism is used to exchange heat for the coolant, so that the coolant can be recycled; at the same time, the circulating liquid storage tank also plays the role of collecting leaked medium. Once the inner isolation sleeve is damaged and causes leakage of the medium in the pump body, the leaked medium can be collected in the circulating liquid storage tank for temporary storage, and will not leak into the atmosphere to cause air pollution.

[0026] Furthermore, the thickness of the inner isolation sleeve is smaller than that of the outer isolation sleeve, the inner isolation sleeve is made of metal material, and the outer isolation sleeve is made of non-metal material.

[0027] The beneficial effect of adopting the above further technical solution is that it can not only ensure the transmission efficiency and realize the effective transmission of power, but also reduce the eddy heat to a minimum and avoid a sharp increase in the temperature inside the pump.

[0028] Compared with the prior art, the present invention has the following technical effects: The magnetic pump provided by the present invention adopts a circulating cooling component to realize the circulating flow of a medium or a coolant in a circulating cooling channel. The circulating flow of the medium or the coolant can take away the eddy current heat generated by the magnetic coupling between the inner magnetic rotor and the outer magnetic rotor, thereby preventing the temperature in the pump from rising due to the eddy current heat. The isolation sleeve adopts a double-layer design, that is, it adopts a combination of inner and outer isolation sleeves. The inner isolation sleeve is made of metal material and the outer isolation sleeve is made of non-metallic material. This not only ensures the transmission efficiency, but also can reduce the thickness of the inner isolation sleeve, thereby minimizing the eddy current heat.

[0029] By setting the air inlet, air outlet and air flow channel, low-temperature air flow is transported to the chamber between the isolation sleeve and the outer magnetic rotor, and the heat is taken away in time by the low-temperature air flow. Especially when the pump is running dry, the heat in the pump can be taken away in time and effectively to avoid a sharp increase in the temperature in the pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1A cross-sectional view of a magnetic pump according to Embodiment 1 of the present invention is shown; Figure 2 A schematic diagram of the structure of a blade is shown; Figure 3 Show Figure 2 Section view along AA direction; Figure 4 A schematic diagram showing the structure of the circulating cooling assembly of Example 1; Figure 5 A cross-sectional view showing a magnetic pump according to Embodiment 2 of the present invention; Figure 6 A schematic diagram showing the structure of a circulating cooling assembly of Example 2; Reference numerals: 1. Pump body; 2. Impeller; 3. Pump cover; 4. Driven shaft; 5. Sliding bearing assembly; 6. Driving shaft; 7. Thrust bearing assembly; 8. Circulating cooling assembly; 9. Inner magnetic rotor; 10. Bracket; 11. Isolation sleeve; 12. Outer magnetic rotor; 13. Connecting frame; 14. Bearing housing; 15. Cavity; 16. Circulating cooling channel; 17. Air inlet; 18. Air outlet; 19. Connecting piece; 20. Blade; 21. Air flow channel; 22. Inner isolation sleeve; 23. Outer isolation sleeve; 24. Medium storage tank; 25. Medium channel; 26. Connecting pipe; 27. Liquid seal; 28. Reinforcement rib; 29. ​​Residue discharge pipeline; 30. Circulating liquid outlet; 31. Circulating liquid inlet; 32. Circulating liquid storage tank; 33. Heat exchange mechanism. DETAILED DESCRIPTION

[0031] The following specific embodiments illustrate the implementation of the present invention, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this invention are limited to this implementation. On the contrary, the purpose of introducing the invention in conjunction with the implementation is to cover other options or modifications that may extend based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will include many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0032] Example 1 See also Figure 1-Figure 4A dry-running magnetic pump comprises a pump body 1, an impeller 2, a pump cover 3, a driven shaft 4, a driving shaft 6, two sets of circulating cooling components 8, an inner magnetic rotor 9, a bracket 10, an isolation sleeve 11, an outer magnetic rotor 12, a connecting frame 13 and a bearing housing 14, wherein the pump cover 3 is mounted on the pump body 1; the pump body 1, the bracket 10, the connecting frame 13 and the bearing housing 14 are connected in sequence; a cavity 15 is provided inside the pump body 1, the impeller 2 and the driven shaft 4 are both located in the cavity 15, and one end of the driven shaft 4 is connected to the impeller 2 The other end is connected to the inner magnetic rotor 9; the driving shaft 6 is arranged in the bearing housing 14, and one end of the driving shaft 6 close to the driven shaft 4 is connected to the outer magnetic rotor 12; the isolation sleeve 11 is located between the inner magnetic rotor 9 and the outer magnetic rotor 12, and the open end of the isolation sleeve 11 is connected to the pump body 1; the isolation sleeve 11 includes an inner isolation sleeve 22 and an outer isolation sleeve 23 arranged at intervals, and the interlayer between the inner isolation sleeve 22 and the outer isolation sleeve 23 is a circulating cooling channel 16, and the two groups of the circulating cooling groups One end of each component 8 is connected to the cavity 15, and the other end is respectively connected to the two open ends of the circulating cooling channel 16, so as to realize the circulation flow of the medium. Specifically, the medium flowing in the cavity 15 is transported to one end of the circulating cooling channel 16 connected thereto via a group of circulating cooling components 8, and returns to the cavity 15 via the other end thereof and the circulating cooling component 8 connected thereto after flowing through the circulating cooling channel 16; because the circulating cooling channel 16 is connected to the cavity 15, the inner and outer sides of the inner isolation sleeve 22 are subjected to exactly the same pressure, and the inner and outer sides of the inner isolation sleeve 22 are subjected to equal forces, thereby reducing the possibility of damage to the inner isolation sleeve 22, and therefore, the wall thickness of the inner isolation sleeve 22 can be greatly reduced, thereby reducing the generation of eddy heat; at the same time, when the medium circulates in the circulating cooling channel 16, the eddy heat can be taken away in time; further, transferring part of the medium in the cavity 15 of the pump body 1 to the circulating cooling channel 16 can increase the circulation flow of the medium, thereby increasing the medium flow required at the driven shaft 4 and the sliding bearing, thereby reducing the frictional heat generated between the two.

[0033] The inner isolation sleeve 22 and the outer isolation sleeve 23 are made of different materials and have different thicknesses. Specifically, the inner isolation sleeve 22 is made of metal and the outer isolation sleeve 23 is made of non-metallic material. This ensures the magnetic force transmission efficiency while minimizing the eddy current heat. The eddy current heat is mainly generated by the inner isolation sleeve 22. The thickness of the inner isolation sleeve 22 is less than that of the outer isolation sleeve 23, thereby reducing the eddy current heat generated by the inner isolation sleeve 22. By adopting a sandwich design and using an outer isolation sleeve 23 with a thicker thickness, the mechanical strength of the isolation sleeve 11 is improved to avoid damage and leakage of the medium. Even if the inner isolation sleeve 22 is damaged, the outer isolation sleeve 23 can also block the medium and avoid leakage of the medium.

[0034] The two groups of circulating cooling components 8 have the same structure. Taking one group of circulating cooling components 8 as an example for explanation, the circulating cooling component 8 includes a medium storage tank 24, a medium channel 25, and a connecting pipe 26. A liquid seal 27 is provided in the medium storage tank 24, and the medium channel 25 is connected to the liquid seal 27. The medium channel 25 includes two, one of which is connected to the cavity 15, and the other is connected to the circulating cooling channel 16, so as to realize the circulation flow of the medium and ensure that the medium takes away the eddy heat in time; the connecting pipe 26 includes two, one of which extends below the liquid surface in the medium storage tank 24, and the other connecting pipe 26 does not extend below the liquid surface, so as to achieve the purpose of liquid sealing, play a buffering role on the air pressure in the pump, and ensure that the increased pressure in the pump is smoothly transmitted to the outside of the inner isolation sleeve 22, so as to avoid the sudden increase of pressure causing the inner isolation sleeve 22 to be damaged by impact.

[0035] An air inlet 17 is provided on the connecting frame 13, and an air outlet 18 is provided on the bracket 10. The air inlet 17 is communicated with the chamber between the isolation sleeve 11 and the external magnetic rotor 12 through an air flow channel 21, and the air outlet 18 is communicated with the chamber between the isolation sleeve 11 and the external magnetic rotor 12 through a gap between the external magnetic rotor 12 and the isolation sleeve 11; specifically, the external magnetic rotor 12 is connected to the driving shaft 6 through a connecting member 19, and the connecting member 19 includes a plurality of blades 20 arranged at intervals, and the blades 20 include a first end and a second end, wherein the first end is connected to the driving shaft 6, and the second end is connected to the external magnetic rotor 12, and the gap between two adjacent blades 20 forms an air flow channel 21 for the heat exchange gas to enter.

[0036] The blade 20 is provided with a reinforcing rib 28, which serves to improve the mechanical strength of the blade 20 and ensure the strength of the rotational connection. When the motor drives the active shaft 6 to rotate, the synchronous rotation of the external magnetic rotor 12 is ensured, and the reinforcing rib 28 guides the airflow; the blade 20 is bent so that the cross-sectional area of ​​the airflow channel 21 near the first end is smaller than the cross-sectional area of ​​the airflow channel 21 near the second end, that is, the cross-sectional area of ​​the airflow channel 21 near the center is small, and the cross-sectional area away from the center is large, so that the external gas is introduced into the gap between the isolation sleeve 11 and the external magnetic rotor 12, and the heat generated by the isolation sleeve 11 is continuously taken away to complete the air cooling cycle.

[0037] The driving shaft 6 drives the outer magnetic rotor 12 to rotate. The outer magnetic rotor 12 acts as a driving rotor to transmit power to the inner magnetic rotor 9 without contact, thereby completing the medium transportation. At the same time, during the rotation of the outer magnetic rotor 12 and the connecting piece 19 together, it can be used as a power device to circulate the external airflow, take away the heat outside the isolation sleeve 11, and realize the cooling of the external area of ​​the isolation sleeve 11.

[0038] The air outlet 18 is opened at one end of the bracket 10 close to the pump body 1, and the air outlet 18 is arranged away from the air inlet 17, ensuring that the airflow enters the cavity between the isolation sleeve 11 and the outer magnetic rotor 12 after entering through the air inlet 17, thereby effectively reducing the temperature in the pump body 1 and avoiding the airflow from being discharged directly through the air outlet 18 without entering the cavity between the isolation sleeve 11 and the outer magnetic rotor 12.

[0039] A sliding bearing assembly 5 and a thrust bearing assembly 7 are arranged circumferentially of the driven shaft 4. The sliding bearing assembly 5 includes a sliding bearing seat, a sliding bearing and a sleeve. The sliding bearing seat is fixed on the pump body 1, and the sleeve is sleeved on the driven shaft 4. The sliding bearing is arranged between the sliding bearing seat and the sleeve. The sliding bearing assembly 5 is used to improve the supporting stability and rotation accuracy of the driven shaft 4, reduce friction and wear, and increase the service life of the bearing and the driven shaft 4; the thrust bearing assembly 7 is sleeved on the driven shaft 4 to prevent the driven shaft 4 from moving in the axial direction.

[0040] The magnetic pump provided by the present invention uses tar as the medium. In order to avoid the fluidity of the tar being affected by temperature changes, an insulation layer is provided on the outer wall of the pump body 1, the pump cover 3, and the bracket 10 for insulation, ensuring that the temperature of the tar medium in the cavity 15 is maintained within a stable temperature range to ensure the fluidity of the tar.

[0041] The front end of the pump body 1 is provided with a residual discharge pipeline 29 . When the pump body 1 is repaired, the medium in the pump cavity is discharged through the residual discharge pipeline 29 , which facilitates the repair of the pump body 1 .

[0042] Impeller 2 is an open impeller, which is convenient for cleaning the attachments of the tar medium.

[0043] The bearing is made of silicon carbide material, which reduces friction and heat generation during sliding friction with the driven shaft 4.

[0044] Example 2 See also Figure 2 , Figure 3 , Figure 5 , Figure 6A dry-running magnetic pump comprises a pump body 1, an impeller 2, a pump cover 3, a driven shaft 4, a driving shaft 6, a circulating cooling assembly 8, an inner magnetic rotor 9, a bracket 10, an isolation sleeve 11, an outer magnetic rotor 12, a connecting frame 13 and a bearing housing 14, wherein the pump cover 3 is mounted on the pump body 1; the pump body 1, the bracket 10, the connecting frame 13 and the bearing housing 14 are connected in sequence; a cavity 15 is provided inside the pump body 1, the impeller 2 and the driven shaft 4 are both located in the cavity 15, and the driven shaft 4 is One end of the driving shaft 4 is connected to the impeller 2, and the other end is connected to the inner magnetic rotor 9; the driving shaft 6 is arranged in the bearing housing 14, and the end of the driving shaft 6 close to the driven shaft 4 is connected to the outer magnetic rotor 12; the isolation sleeve 11 is located between the inner magnetic rotor 9 and the outer magnetic rotor 12, and the open end of the isolation sleeve 11 is connected to the pump body 1; the isolation sleeve 11 includes an inner isolation sleeve 22 and an outer isolation sleeve 23 arranged at intervals, and the inner isolation sleeve 22 and the outer isolation sleeve 23 is a circulating cooling channel 16, and the circulating cooling channel 16 includes two open ends; the circulating cooling component 8 includes a circulating liquid storage tank 32 and a heat exchange mechanism 33, and the circulating liquid storage tank 32 is provided with a circulating liquid outlet 30 and a circulating liquid inlet 31, and the circulating liquid outlet 30 and the circulating liquid inlet 31 are respectively connected to the two open ends of the circulating cooling channel 16, and the circulating coolant in the circulating liquid storage tank 32 is transported to the circulating cooling channel 16 to realize the cooling and cooling of the isolation sleeve 11, and the external coolant is introduced into the heat exchange mechanism 33 to cool the circulating liquid returned to the circulating liquid storage tank 32 through the circulating cooling channel 16, thereby realizing the recycling of the circulating coolant and continuously cooling the isolation sleeve 11; even if the inner isolation sleeve 22 is damaged due to the increase of temperature, pressure, and service life, causing the leakage of the medium in the pump body 1, the leaked medium can be collected in the circulating liquid storage tank 32 for temporary storage, and will not leak into the atmosphere to cause air pollution.

[0045] The circulating coolant in the circulating liquid storage tank 32 is a circulating liquid that does not react with the pump conveying medium.

[0046] The rest of Example 2 is the same as Example 1 and will not be described again here.

[0047] 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, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A dry-running magnetic pump, characterized in that: The invention comprises a pump body (1), an impeller (2), a driven shaft (4), a driving shaft (6), an inner magnetic rotor (9), a bracket (10), a spacer sleeve (11), an outer magnetic rotor (12), a bearing housing (14) and a circulating cooling assembly (8); the pump body (1), the bracket (10) and the bearing housing (14) are connected in sequence; a cavity (15) is provided inside the pump body (1), the impeller (2) and the driven shaft (4) are both located in the cavity (15), one end of the driven shaft (4) is connected to the impeller (2), and the other end is connected to the inner magnetic rotor (9); the driving shaft (6) is arranged in the bearing housing (14), and one end of the driving shaft (6) close to the driven shaft (4) is connected to the outer magnetic rotor (12); the isolation sleeve (11) is located between the inner magnetic rotor (9) and the outer magnetic rotor (12), and the open end of the isolation sleeve (11) is connected to the pump body (1); the isolation sleeve (11) includes at least one layer, and a circulating cooling channel (16) is provided on the outer wall of the isolation sleeve (11) or between each layer of the isolation sleeve (11), and the two ends of the circulating cooling channel (16) are connected to the circulating cooling component (8).

2. The dry-running magnetic pump according to claim 1, characterized in that: It also includes a connecting frame (13), the connecting frame (13) being arranged at the connection between the bracket (10) and the bearing housing (14), the connecting frame (13) being provided with an air inlet (17), the bracket (10) being provided with an air outlet (18), the air inlet (17) and the air outlet (18) both being connected to the chamber between the isolation sleeve (11) and the external magnetic rotor (12).

3. The dry-running magnetic pump according to claim 2, characterized in that: The external magnetic rotor (12) is connected to the driving shaft (6) via a connecting member (19), the connecting member (19) comprising a plurality of blades (20) arranged at intervals, the blades (20) comprising a first end and a second end, the first end being connected to the driving shaft (6), and the second end being connected to the external magnetic rotor (12).

4. The dry-running magnetic pump according to claim 3, characterized in that: An airflow channel (21) is provided between adjacent blades (20), and a cross-sectional area of ​​the airflow channel (21) close to the first end is smaller than a cross-sectional area of ​​the airflow channel (21) close to the second end.

5. The dry-running magnetic pump according to claim 2, characterized in that: The air outlet (18) is disposed at one end of the bracket (10) close to the pump body (1).

6. The dry-running magnetic pump according to claim 1, characterized in that: The isolation sleeve (11) comprises an inner isolation sleeve (22) and an outer isolation sleeve (23), and the circulating cooling channel (16) is provided between the inner isolation sleeve (22) and the outer isolation sleeve (23).

7. The dry-running magnetic pump according to claim 6, characterized in that: The circulating cooling component (8) is in communication with the cavity (15).

8. The dry-running magnetic pump according to claim 7, characterized in that: The circulating cooling component (8) comprises a medium storage tank (24), a medium channel (25) and a connecting pipe (26); a liquid seal (27) is provided in the medium storage tank (24); and the medium channel (25) is in communication with the liquid seal (27).

9. The dry-running magnetic pump according to claim 6, characterized in that: The circulating cooling assembly (8) comprises a circulating liquid storage tank (32) and a heat exchange mechanism (33); the circulating liquid storage tank (32) is provided with a circulating liquid outlet (30) and a circulating liquid inlet (31); the circulating liquid outlet (30) and the circulating liquid inlet (31) are respectively connected to two ends of the circulating cooling channel (16).

10. The dry-running magnetic pump according to any one of claims 6 to 9, characterized in that: The thickness of the inner isolation sleeve (22) is smaller than the thickness of the outer isolation sleeve (23); the inner isolation sleeve (22) is made of a metal material, and the outer isolation sleeve (23) is made of a non-metallic material.

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