Gas isolation type shaft-seal-free permanent magnet transmission pump

Abstract

The utility model discloses a gas isolation type shaft-seal-free permanent magnet transmission pump, which belongs to the field of medium transmission and comprises a power component, a magnetic rotor component and a shaft system component. The magnetic rotor assembly comprises a permanent magnet outer rotor and a permanent magnet inner rotor which correspond to each other in position and are magnetically coupled, and an isolation sleeve is arranged between the permanent magnet outer rotor and the permanent magnet inner rotor; the shaft system assembly comprises a bearing seat, the spacer sleeve and the bearing seat are connected to form a sealed space, the permanent magnet inner rotor is located in the sealed space, and the bearing seat is provided with an air channel communicated with the sealed space. According to the utility model, a constant-pressure sealing structure, a permanent magnet suspension shaft system, an alloy bearing and a permanent magnet transmission structure are adopted, so that the functions of leakage-free magnetic transmission, external medium conveying and sealing are realized, and particulate matters of an external medium cannot enter the magnetic rotor assembly; the double-sealing function of gas static sealing and medium constant-pressure sealing enables gas and external media to be sealed in a two-way mode without leakage, and the sealed gas does not leak.

Description

Technical Field

[0001] This utility model relates to the field of media transmission technology, and in particular to a gas-isolated shaftless permanent magnet drive pump. Background Technology

[0002] In fluid transport equipment, all types of pumps suffer from drive shaft sealing issues. Drive shafts utilize either magnetic seals or mechanical seals. Mechanical seals are dynamic seals, using various types of sealing rings to provide radial and axial sealing of the rotating shaft, allowing the medium to flow axially. However, over time, leakage occurs, polluting the working environment, posing safety risks, and requiring frequent maintenance. Magnetic seals consist of a permanent magnet inner rotor, a permanent magnet outer rotor, and an isolation sleeve. The isolation sleeve seals the permanent magnet inner rotor and the medium within the working chamber. A motor drives the permanent magnet outer rotor, which in turn drives the permanent magnet inner rotor using magnetic coupling, achieving contactless torque transmission and static sealing. Magnetic seals completely eliminate medium leakage, overcoming the shortcomings of mechanical seals.

[0003] To achieve a leak-free seal, a magnetic sealing structure is required. Magnetic drive pumps solve the leakage problem in fluid transportation, but the fluid they transport cannot contain metallic or non-metallic particles. Because the gap between the permanent magnet inner rotor and the isolation sleeve is very small, such particles entering the magnetic sealing component will cause wear to the permanent magnet inner rotor and the isolation sleeve. In addition to damage, they will also damage the transmission components and reduce the service life of the equipment.

[0004] For leak-free transport of fluids containing particulate matter, a common solution is to install a filter at the inlet of the magnetically driven pump to remove particulate matter and prevent wear caused by particulate matter entering the magnetic seal and damaging the permanent magnet rotor, isolation sleeve, and transmission components, thus ensuring stable system operation. However, for leak-free transport of media that cannot or do not allow the filtration of particulate matter, magnetically driven pumps cannot be used. As mentioned above, conventional pumps with mechanical seals cannot completely solve the leak-free transport problem. Utility Model Content

[0005] The main purpose of this invention is to provide a gas-isolated, shaftless, permanent magnet drive pump that solves the problem that existing magnetic drive pumps cannot transport materials containing particulate matter.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] This utility model provides a gas-isolated, seal-free permanent magnet drive pump, including a power component, a magnetic rotor component, and a shaft system component;

[0008] The magnetic rotor assembly includes a permanent magnet outer rotor and a permanent magnet inner rotor that are correspondingly positioned and magnetically coupled. An isolation sleeve is provided between the permanent magnet outer rotor and the permanent magnet inner rotor, and the isolation sleeve covers the permanent magnet inner rotor. The permanent magnet outer rotor is connected to the power assembly, and the shaft system assembly is connected to the permanent magnet inner rotor.

[0009] The shaft assembly includes a bearing housing, the isolation sleeve and the bearing housing are connected to form a sealed space, the permanent magnet inner rotor is located in the sealed space, and the bearing housing has an air passage communicating with the sealed space.

[0010] Furthermore, the shaft assembly also includes a shaft connected to the permanent magnet inner rotor, the shaft passing through the bearing housing.

[0011] Furthermore, the shaft assembly also includes alloy rolling bearings and alloy tapered roller bearings, which are installed in the bearing housing and fitted onto the shaft.

[0012] Furthermore, the shaft assembly also includes an alloy sliding bearing fitted onto the shaft.

[0013] Furthermore, the shaft assembly also includes a permanent magnet levitation bearing, the fixed end of which is installed in the bearing housing, and the moving end of which is in close contact with the lower end of the permanent magnet inner rotor.

[0014] Furthermore, the power assembly includes a connected pump body and a pump cover, the pump cover is also connected to the bearing housing, the alloy sliding bearing is installed inside the pump cover, the pump body has a liquid outlet, the pump body is provided with an impeller, and the shaft passes through the pump cover and is connected to the impeller.

[0015] Furthermore, an upper sealing ring and a lower sealing ring are respectively provided at both ends of the pump cover, and the upper sealing ring and the lower sealing ring are used to seal the alloy sliding bearing.

[0016] Furthermore, the shaft is provided with a transmission air passage along its axial direction, the transmission air passage extends into the space formed by the pump cover and the bearing seat, and the pump cover is provided with a pressure regulating valve communicating with the space.

[0017] Furthermore, a pressure gauge is also provided on the pump cover, which is used to detect the pressure value on the back of the impeller.

[0018] Furthermore, the power assembly also includes an inducer wheel, and the impeller is mounted to the end of the shaft via the inducer wheel.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] This utility model of a gas-isolated, shaftless, permanent magnet drive pump employs a constant-pressure sealing structure, a permanent magnet levitation shaft system, alloy bearing technology, and a permanent magnet drive structure. It achieves leak-free magnetic transmission, external media transport, and sealing functions. Particulate matter from the external medium cannot enter the magnetic rotor assembly. It features a dual-sealing function of gas static sealing and constant-pressure media sealing, ensuring bidirectional leak-free sealing between gas and external media, and preventing gas leakage. This effectively protects the magnetic rotor assembly and shaft system from damage caused by the infiltration of particulate-containing external media, extending equipment lifespan, ensuring stable system operation, and improving transmission efficiency. It boasts advantages such as compact structure, reliable operation, maintenance-free operation, and long service life, making it particularly suitable for leak-free transport of particulate-containing media. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the gas-isolated, shaftless, permanent magnet drive pump of this utility model;

[0022] Figure 2 This is a schematic diagram of the magnetic rotor assembly of the gas-isolated, shaftless, permanent magnet drive pump of this utility model;

[0023] Figure 3 This is a schematic diagram of the shaft system assembly of the gas-isolated, seal-free permanent magnet drive pump of this utility model;

[0024] Figure 4 This is a schematic diagram of the working state of the gas-isolated shaftless permanent magnet drive pump of this utility model.

[0025] In the diagram: 1. Pump body, 2. Inducer wheel, 3. Impeller, 4. Lower sealing ring, 5. Shaft, 6. Alloy sliding bearing, 7. Pump cover, 8. Upper sealing ring, 9. Pressure regulating valve, 10. Intermediate sleeve, 11. Bearing cover, 12. Alloy tapered roller bearing assembly, 13. Bearing housing, 14. Alloy rolling bearing, 15. Permanent magnet levitation bearing, 16. Pressure ring, 17. Permanent magnet inner rotor, 18. Isolation sleeve, 19. Permanent magnet outer rotor, 20. Connecting bracket, 21. Motor support, 22. Motor, 23. Inlet valve, 24. Pressure gauge. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] See Figures 1-3This embodiment discloses a gas-isolated, shaftless, permanent magnet drive pump. The pump comprises a pump body 1, an inducer wheel 2, an impeller 3, a lower sealing ring 4, a shaft 5, an alloy sliding bearing 6, a pump cover 7, an upper sealing ring 8, a pressure regulating valve 9, an intermediate sleeve 10, a bearing cover 11, an alloy tapered roller bearing assembly 12, a bearing housing 13, an alloy rolling bearing 14, a permanent magnet suspension bearing 15, a pressure ring 16, a permanent magnet inner rotor 17, an isolation sleeve 18, a permanent magnet outer rotor 19, a connecting bracket 20, a motor support 21, a motor 22, an inlet valve 23, and a pressure gauge 24, all connected by screws, sealing rings, keys, and bearings. This drive pump is a single-stage centrifugal magnetic pump with a single-layer, vertical structure, and is a single-impeller working device with an inducer wheel 2. It provides contactless power transmission and external media delivery and sealing functions, exhibiting both gas static sealing and constant pressure media sealing characteristics.

[0028] See Figure 2 The magnetic rotor assembly consists of a permanent magnet inner rotor 17, an isolation sleeve 18, and a permanent magnet outer rotor 19. The permanent magnet inner rotor 17 and the permanent magnet outer rotor 19 are permanent magnet structures, encased in stainless steel to prevent contact between the permanent magnet inner rotor 17 and the gas. The isolation sleeve 18 is a non-rotating component, completely isolating the permanent magnet inner rotor 17 and the gas from the permanent magnet outer rotor 19. The permanent magnet outer rotor 19 drives the permanent magnet inner rotor 17 to rotate through magnetic coupling, completing the non-contact torque transmission. This achieves shaft seal-free power transmission, transforming dynamic sealing into static sealing and meeting the requirements for leak-free transmission. The use of a low-heat isolation sleeve 18 prevents the gas temperature from rising, ensuring stable magnetic operation of the system and improving transmission efficiency while simultaneously achieving a static gas seal.

[0029] See Figure 3 The permanent magnet levitation shaft system assembly comprises shaft 5, alloy sliding bearing 6, bearing cover 11, alloy tapered roller bearing assembly 12, bearing housing 13, alloy rolling bearing 14, and permanent magnet levitation bearing 15. This shaft system assembly is a suspended transmission shaft system supported by a single alloy sliding bearing, two alloy rolling bearings, and a permanent magnet levitation bearing. This ensures the balance of axial forces under various working conditions, greatly eliminates the influence of gravity and working loads on the shaft system assembly, extends the service life of the shaft system assembly, and guarantees the transmission accuracy of shaft 5 and the stability and safety of the system operation. Specifically, the alloy tapered roller bearing assembly 12 is a combination of double-row alloy tapered roller bearings, which withstands axial and radial forces generated by irregular movement of the medium and has dry friction characteristics of high temperature resistance, high pressure resistance, and wear resistance. Alloy sliding bearing 6 and alloy rolling bearing 14 are used to radially constrain the offset of shaft 5 and also have dry friction characteristics of high temperature resistance, high pressure resistance, and wear resistance. The permanent magnet levitation bearing 15 uses a specific magnet arrangement structure to eliminate the instability of levitation, greatly eliminating the influence of gravity and working loads on the shaft system assembly.

[0030] See Figure 1The pump body, consisting of a pump body 1, an inducer wheel 2, an impeller 3, a lower sealing ring 4, a pump cover 7, an upper sealing ring 8, a pressure regulating valve 9, an intermediate sleeve 10, a pressure ring 16, a connecting bracket 20, a motor support 21, a motor 22, an air inlet valve 23, and a pressure gauge 24, forms the power unit and is the core component of this gas-isolated shaftless permanent magnet drive pump. The lower centrifugal impeller 3 and the inducer wheel 2 perform work on the external medium to achieve the purpose of external medium transportation. The isolation sleeve 18 achieves static gas sealing and leak-free operation. The lower sealing ring 4, the upper sealing ring 8, and the constant pressure gas work together to achieve constant pressure sealing of the transported medium, preventing particulate matter from entering the shaft assembly and damaging the transmission components.

[0031] In this embodiment, the permanent magnet outer rotor 19 and the motor 22 are connected together by keys and screws to form an active component. The permanent magnet inner rotor 17 and the shaft 5 are connected together by round nuts and keys to form a passive component. The isolation sleeve 18 and the bearing housing 13 are connected together by screws, sealing rings, and pressure rings 16 to form a gas static sealing component to ensure no gas leakage. The lower sealing ring 4 and the upper sealing ring 8 are installed on the impeller 3 and the alloy sliding bearing 6 respectively by reasonable fit to form a bidirectional seal between gas and external medium. The constant pressure system ensures that gas and external medium do not leak from each other. The lower sealing ring 4 and the upper sealing ring 8 are contact sealing devices, which rely on radial clamping force and special tortuous gap to achieve axial and radial sealing. The pump body 1 and the pump cover 7 are connected together by screws and sealing rings to form the working chamber of the impeller 3. The impeller 3 and the shaft 5 are connected together by the inducer wheel 2 and keys to form the lower working component. The pressure ring 16 and bearing housing 13 are connected as a single unit using screws. The bearing housing 13 has a gas inlet and a gas outlet channel. A transmission channel is provided along the axis of the shaft 5, connecting the gas inlet and outlet channels. The pump cover 7 and intermediate sleeve 10 are connected as a single unit using screws and sealing rings to form a gas working chamber. A pressure regulating valve connected to this gas working chamber is provided on the pump cover 7. The bearing housing 13, intermediate sleeve 10, and pump cover 7 are connected as a single unit using screws and sealing rings. The bearing cover 11 and bearing housing 13 are connected as a single unit using screws to position the alloy rolling bearing assembly 12. The motor support 21 and bearing housing 13 are connected as a single unit using screws. The bearing housing 13 is a support component that connects the motor support 21, intermediate sleeve 10, inlet valve 23, and shaft assembly. The motor support 21 and connecting bracket 20 are connected as a single unit using screws. The connecting bracket 20 positions and supports the gas-isolated, seal-free permanent magnet pump.

[0032] The permanent magnet levitation bearing 15 is fixed to the bearing housing 13 by screws, and the moving end of the permanent magnet levitation bearing 15 is in close contact with the permanent magnet inner rotor 17 without clearance. The permanent magnet inner rotor 17 suspends the shaft assembly, greatly eliminating the influence of gravity and working load on the shaft assembly. The alloy sliding bearing 6, alloy tapered roller bearing assembly 12, alloy rolling bearing 14, and permanent magnet levitation bearing 15 are installed on the shaft 5 with reasonable fit clearances.

[0033] The pressure gauge 24 and the pump cover 7 are connected by a threaded connection. The pressure gauge 24 detects the pressure on the back of the impeller 3 in real time and displays the reading. The inlet valve 23 and the bearing housing 13 are connected by a threaded connection to introduce gas. The pressure regulating valve 9 and the pump cover 7 are connected by a threaded connection. The pressure regulating valve 9 changes the gas density inside the pump cover 7, thereby adjusting the stress and achieving constant pressure sealing.

[0034] Motor 22 provides power to the gas-isolated, sealless permanent magnet drive pump.

[0035] See Figure 4 In the case of high-pressure gas sealing, for example, the gas-isolated shaftless permanent magnet drive pump of this embodiment is externally connected to nitrogen. Since nitrogen is an inert gas, it can prevent leakage during the operation of the drive pump, which could lead to deflagration or chemical reaction with system components or the medium to be transported. Of course, it is understood that other gases can also be selected according to needs and actual conditions, and this application does not limit this. The gas enters the gas inlet passage of the bearing housing 13 from the B inlet of the inlet valve 23 (indicated by the arrow), flows upward and out from the gap between the permanent magnet inner rotor 19 and the isolation sleeve 18, then enters the transmission passage of the central hole of the shaft 5, flows downward and then enters the gas outlet passage of the bearing housing 13, finally converging in the cavity of the intermediate sleeve 10 and the pump cover 7. When the gas pressure exceeds the hydraulic reading value of the detection pressure gauge 24, the high-pressure gas will enter the working chamber of the impeller 3 along the shaft 5 to relieve pressure until pressure balance is reached. Of course, the pressure can also be relieved by manually opening the pressure regulating valve 9 so that its reading value is the same as the hydraulic reading value of the detection pressure gauge 24, and then closing the pressure regulating valve 9. If the gas pressure is lower than the hydraulic reading on the pressure gauge 24, the inlet valve 23 is opened to increase the density of the gas entering the pump cover 7 and pressurize it until the reading matches the hydraulic reading on the pressure gauge 24, at which point the inlet valve 23 is closed. Preferably, the system can also be a constant pressure inlet device without closing the inlet valve. Gas pressure regulation is key to achieving constant pressure sealing. The gas pressure is adjusted based on the pressure changes on the pressure gauge 24 to ensure that the hydraulic pressure on the lower sealing ring 4 and the gas pressure on the upper sealing ring 8 are always the same or the gas pressure is slightly higher than the hydraulic pressure, thereby avoiding internal leakage of particulate media due to pressure difference.

[0036] See Figure 4During operation, the permanent magnet outer rotor 19 is driven by motor 22 to rotate at high speed. Due to the magnetic field between the permanent magnet inner rotor 17 and the permanent magnet outer rotor 19, the permanent magnet outer rotor 19 drives the permanent magnet inner rotor 17 inside the isolation sleeve 18 to rotate synchronously through magnetic coupling characteristics, and drives the shaft 5 to rotate, transmitting the torque of motor 22 to the lower impeller 3 and inducer 2 without contact. The isolation sleeve 18 is a non-rotating component. The isolation sleeve 18 ensures no gas leakage. The rotation of shaft 5 drives the lower impeller 3 and inducer 2 to rotate, doing work on the external medium. The external medium is axially drawn in from the lower A inlet (indicated by the arrow) and radially flows out from the lower A outlet (indicated by the arrow), realizing the external medium transportation. External medium creates a certain hydraulic pressure on the back of impeller 3, which is also the surface pressure at the lower sealing ring 4. This pressure can be displayed by pressure gauge 24. External gas, through the combined action of pressure regulating valve 9 and inlet valve 23, generates a constant pressure at the upper sealing ring 8. This pressure is the same as or slightly greater than the reading displayed by pressure gauge 24, meaning the pressure at the upper sealing ring 8 is the same as or slightly greater than the hydraulic pressure at the lower sealing ring 4. Due to the set gas pressure, the external medium delivery pressure, and the combined effects of the lower and upper sealing rings 4 and 8, external medium will not rise into the drive shaft system, and gas will not descend into the pump body 1. This achieves constant pressure bidirectional sealing, avoiding internal leakage of particulate-containing media due to pressure differences, and effectively protecting the magnetic rotor assembly and shaft assembly from damage by particulate-containing external media. In case of overload, the permanent magnet inner rotor 17 and the permanent magnet outer rotor 19 slip relative to each other, which protects the motor 22.

[0037] It should be noted that, in this document, terms such as “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0038] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A gas-isolated, shaft-seamless permanent magnet drive pump, characterized in that, Includes power components, magnetic rotor components, and shaft system components; The magnetic rotor assembly includes a permanent magnet outer rotor and a permanent magnet inner rotor that are correspondingly positioned and magnetically coupled. An isolation sleeve is provided between the permanent magnet outer rotor and the permanent magnet inner rotor, and the isolation sleeve covers the permanent magnet inner rotor. The permanent magnet outer rotor is connected to the power assembly, and the shaft system assembly is connected to the permanent magnet inner rotor. The shaft assembly includes a bearing housing, the isolation sleeve and the bearing housing are connected to form a sealed space, the permanent magnet inner rotor is located in the sealed space, and the bearing housing has an air passage communicating with the sealed space.

2. The gas-isolated, shaftless, permanent magnet drive pump according to claim 1, characterized in that, The shaft assembly also includes a shaft connected to the permanent magnet inner rotor, the shaft passing through the bearing housing.

3. The gas-isolated, shaftless, permanent magnet drive pump according to claim 2, characterized in that, The shaft assembly also includes alloy rolling bearings and alloy tapered roller bearings, which are installed in the bearing housing and fitted onto the shaft.

4. The gas-isolated, seal-free permanent magnet drive pump according to claim 2, characterized in that, The shaft assembly also includes an alloy sliding bearing, which is fitted onto the shaft.

5. The gas-isolated, shaftless, permanent magnet drive pump according to claim 2, characterized in that, The shaft assembly also includes a permanent magnet levitation bearing, the fixed end of which is installed in the bearing housing, and the moving end of which is in close contact with the lower end of the permanent magnet inner rotor.

6. The gas-isolated, shaftless, permanent magnet drive pump according to claim 4, characterized in that, The power assembly includes a pump body and a pump cover connected together. The pump cover is also connected to the bearing housing. The alloy sliding bearing is installed inside the pump cover. The pump body has a liquid outlet. An impeller is installed inside the pump body. The shaft passes through the pump cover and is connected to the impeller.

7. The gas-isolated, shaftless, permanent magnet drive pump according to claim 6, characterized in that, The pump cover is provided with an upper sealing ring and a lower sealing ring at both ends, which are used to seal the alloy sliding bearing.

8. The gas-isolated, shaftless, permanent magnet drive pump according to claim 6, characterized in that, The shaft is provided with a transmission air passage along its axial direction, and the transmission air passage extends into the space formed by the pump cover and the bearing seat. The pump cover is provided with a pressure regulating valve that connects to this space.

9. The gas-isolated, seal-free permanent magnet drive pump according to claim 6, characterized in that, The pump cover is also equipped with a pressure gauge, which is used to detect the pressure value on the back of the impeller.

10. The gas-isolated, shaftless, permanent magnet drive pump according to claim 6, characterized in that, The power assembly also includes an inducer wheel, and the impeller is mounted to the end of the shaft via the inducer wheel.

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