Shaft-seal-free permanent magnet transmission booster pump

Abstract

The utility model discloses a shaft-seal-free permanent magnet transmission booster pump, which belongs to the field of medium transmission and comprises a power component, a magnetic rotor component, a shaft system component and a pump transmission component which are sequentially connected. The pump transmission assembly comprises a pump body, an eccentric stator is arranged in the pump body, a medium channel is formed in the eccentric stator, and two protruding parts corresponding to the eccentric stator are arranged on the inner wall of the pump body. The eccentric stator and the two protruding parts are in contact sealing to divide the space between the eccentric stator and the pump body into a medium suction cavity and a medium discharge cavity, the shaft system assembly extends into a cavity of the eccentric stator, and the outer wall of the shaft system assembly is connected with a sliding piece sleeve in a sleeved mode. A plurality of sliding sheets are embedded in the sliding sheet sleeve in the direction from the outer wall to the center of the sliding sheet sleeve. The working volume is changed through periodic continuous movement of the sliding piece, so that suction and discharge of a medium are achieved, and the functions of leakage-free magnetic transmission, medium conveying and sealing are achieved.

Description

Technical Field

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

[0002] Fluid transport is typically achieved using drive pumps, but all currently used pump types suffer from drive shaft sealing issues. Drive shafts come in two forms: magnetic seals and 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, they are prone to aging and damage, leading to leaks, 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. This achieves contactless torque transmission and static sealing, completely eliminating medium leakage and overcoming the shortcomings of mechanical seals. Therefore, magnetic drive pumps solve the leakage problem in fluid transport.

[0003] For gas transport, conventional fans such as centrifugal fans, axial fans, or mixed-flow fans are commonly used. These devices all rely on impellers to perform work on the gas, thus achieving the purpose of gas transport. However, leakage is inevitable during gas transport, and the pressure at the fan inlet is generally low, making gas escape more likely. For the transport of toxic or hazardous gases (such as helium-xenon mixtures), external leakage is unacceptable, and a high inlet pressure (generally 4 MPa) is required. Clearly, conventional fans cannot be used in this case.

[0004] Therefore, different conveying equipment is required for media in different states, such as liquids and gases. It is necessary to design a conveying equipment that can simultaneously convey gases and liquids (especially volatile liquids). Utility Model Content

[0005] The main purpose of this invention is to provide a shaftless permanent magnet drive booster pump that can meet the needs of transmitting gas or liquid media.

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

[0007] A sealless permanent magnet drive booster pump includes a power assembly, a magnetic rotor assembly, a shaft assembly, and a pump transmission assembly connected in sequence.

[0008] The pump transmission assembly includes a pump body with an inlet pipe and an outlet pipe connected to it. An eccentric stator is disposed within the pump body, and a medium channel is provided on the eccentric stator. Two protrusions corresponding to the eccentric stator are provided on the inner wall of the pump body. The two protrusions of the eccentric stator contact and seal to divide the space between the eccentric stator and the pump body into a medium suction chamber and a medium discharge chamber. The inlet pipe is connected to the medium suction chamber, and the outlet pipe is connected to the medium discharge chamber. The shaft assembly extends into the cavity of the eccentric stator, and a sliding vane sleeve is fitted onto the outer wall of the shaft assembly. Multiple sliding vanes are embedded in the sliding vane sleeve along its outer wall towards the center.

[0009] Preferably, the pump transmission assembly further includes two bushings fitted onto the shaft assembly, the two bushings and the end face seals of the eccentric stator together forming the working space of the vane sleeve and the vane.

[0010] Furthermore, the pump transfer assembly also includes a safety valve disposed within the pump body, the safety valve being connected to the medium suction chamber and the medium discharge chamber.

[0011] Furthermore, the magnetic rotor assembly includes an isolation sleeve and a permanent magnet outer rotor and a permanent magnet inner rotor corresponding to the position. The isolation sleeve covers the permanent magnet inner rotor. The permanent magnet outer rotor is connected to the power assembly, and the permanent magnet inner rotor is connected to the shaft assembly.

[0012] Furthermore, the shaft system assembly includes a shaft, and the sliding sleeve is fitted and connected to the shaft.

[0013] Furthermore, the shaft assembly also includes a bearing housing and a mounting bracket, the bearing housing being connected to the isolation sleeve, the mounting bracket being connected to the pump body, and the shaft passing through the bearing housing and extending from the eccentric stator into the mounting bracket.

[0014] Furthermore, both the bearing housing and the mounting bracket are equipped with alloy bearing assemblies, which are fitted onto the shaft.

[0015] Preferably, the shaft system assembly further includes a permanent magnet levitation bearing, wherein the fixed end of the permanent magnet levitation bearing is fixed to the bearing housing, and its moving end is in close contact with the permanent magnet inner rotor without clearance.

[0016] Furthermore, the shaft assembly also includes a spacer sleeve that fits onto the shaft.

[0017] Furthermore, the power assembly includes a motor, which is mounted on a motor bracket, and the motor bracket is sequentially connected to the magnetic rotor assembly and the pump body.

[0018] Compared with the prior art, the shaftless permanent magnet drive booster pump of this utility model has at least the following beneficial effects:

[0019] 1. This utility model utilizes a permanent magnet transmission structure to achieve contactless power transmission, avoiding damage to the pump components caused by the medium. It adopts a multi-vane variable displacement structure design, which uses the shaft rotation to drive the vanes to rotate along the inner wall of the eccentric stator cavity, thereby transmitting the gas or liquid (especially volatile liquids such as gasoline, propane, and ethylene) that enters the medium suction cavity from the inlet end to the outlet end for discharge. At the same time, the medium can be used to cool the transmission components during the transmission process, realizing the functions of leak-free magnetic transmission, medium pressurization and sealing delivery, and self-cooling of transmission components.

[0020] 2. By setting a safety valve, when the pressure at the outlet exceeds the rated pressure, the safety valve can output the medium to the inlet, so that the medium circulates in the pump without being discharged to the outside while ensuring the safety of the system, thus avoiding environmental pollution or personal injury.

[0021] 3. This utility model utilizes a permanent magnet levitation shaft system to fix the shaft system components, which greatly eliminates the influence of the gravity and working load of the shaft system components on themselves, and helps the system to operate stably;

[0022] 4. This utility model utilizes components such as spacer sleeves and alloy bearing assemblies to ensure the balance of radial forces in the shaft system assembly, greatly eliminating the influence of working loads on the shaft system assembly, extending the service life of the shaft system assembly, and ensuring the transmission accuracy of the shaft and the stability and safety of the system operation. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the shaftless permanent magnet drive booster pump of this utility model;

[0024] Figure 2 for Figure 1 Schematic diagram of the AA surface structure;

[0025] Figure 3 This is a schematic diagram of the magnetic rotor component of the shaftless permanent magnet drive booster pump of this utility model;

[0026] Figure 4 This is a schematic diagram of the shaft system assembly of the shaftless permanent magnet drive booster pump of this utility model;

[0027] Figure 5 This is a schematic diagram of the working state of the shaftless permanent magnet drive booster pump of this utility model.

[0028] In the diagram: 1. Motor, 2. Motor support, 3. Permanent magnet outer rotor, 4. Isolation sleeve, 5. Permanent magnet inner rotor, 6. Shaft, 7. Spacer sleeve, 8. Permanent magnet suspension bearing, 9. Upper alloy bearing assembly, 10. Bearing housing, 11. Upper liner, 12. Sliding vane sleeve, 13. Pump body, 14. Eccentric stator, 15. Lower liner, 16. Lower alloy bearing assembly, 17. Mounting support, 18. Outlet pipe, 19. Safety valve, 20. Inlet pipe, 21. Sliding vane. Detailed Implementation

[0029] 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.

[0030] See Figure 1 and Figure 2 This embodiment discloses a sealless permanent magnet drive booster pump, which is a positive displacement magnetic pump with a single-layer shell vertical structure. It is a low-speed vane power device that can provide contactless power transmission, medium pressurization and delivery, and sealing functions. Its structure includes a power assembly, a magnetic rotor assembly, a shaft assembly, and a pump transmission assembly connected in sequence.

[0031] Specifically, the pump transmission assembly includes a pump body 13, with an inlet pipe 20 and an outlet pipe 18 connected to the pump body 13. An eccentric stator 14 is provided inside the pump body 13, and a medium channel is provided on the eccentric stator 14. Two protrusions corresponding to the eccentric stator 14 are provided inside the pump body 13. After the eccentric stator 14 and the two protrusions of the pump body 13 are connected, the space between them is divided into a medium suction chamber and a medium discharge chamber. The inlet pipe 20 is connected to the medium suction chamber, and the outlet pipe 18 is connected to the medium discharge chamber. The shaft assembly extends into the cavity of the eccentric stator 14. A sliding vane sleeve 12 is fitted and connected to the outer wall of the shaft assembly. Multiple sliding vanes 21 are embedded in the sliding vane sleeve 12 along its outer wall towards the center.

[0032] This invention, by placing an eccentric stator 14 inside the pump body 13, forms surface contact between the eccentric stator 14 and the inner walls of the two protruding parts of the pump body 13, dividing the internal space of the pump body 13 into a medium suction chamber and a medium discharge chamber. A through-flow medium channel is provided from the surface of the eccentric stator 14 to its inner wall. This medium channel can be perforated, linear, or other irregular in shape, as long as it ensures that the sliding vane 21 does not insert into the medium channel when rotating along the inner wall of the eccentric stator 14, thus preventing damage to the vane 21 and the inability of the booster pump to operate. Preferably, the medium suction chamber and the medium discharge chamber formed by the eccentric stator 14 and the two protruding parts of the pump body 13 correspond in shape and have the same area, thereby ensuring that the flow rates of the suction and discharge media are consistent when the booster pump of this application is running.

[0033] In this embodiment, the slider 21 is a copper-based alloy slider, which is resistant to high temperatures, friction, and has a long service life. Of course, the slider 21 can also be made of other materials, and this application does not limit this.

[0034] For example, the power component in this embodiment includes a motor 1, which is mounted on a motor bracket 2. Further, the motor 1 is a servo motor, whose high-efficiency frequency conversion servo characteristics ensure the normal operation of the booster pump of this application. Of course, the power component can also adopt other power forms, as long as it satisfies the requirement of providing power to the booster pump.

[0035] See Figure 3 The magnetic rotor assembly of this application includes an isolation sleeve 4 and a permanent magnet outer rotor 3 and a permanent magnet inner rotor 5 positioned accordingly. The isolation sleeve 4 covers the permanent magnet inner rotor 5. The permanent magnet outer rotor 3 is connected to the motor 1, and the permanent magnet inner rotor 5 is connected to the shaft system assembly. Specifically, in this embodiment, the permanent magnet outer rotor 3 and the permanent magnet inner rotor 5 are permanent magnet structures and their outer surfaces are covered with stainless steel to prevent the permanent magnet inner rotor 5 from contacting the medium. The isolation sleeve 4 is a non-rotating component, which completely isolates the permanent magnet inner rotor 5 and the medium from the permanent magnet outer rotor 3. The permanent magnet outer rotor 3 drives the permanent magnet inner rotor 5 to rotate through magnetic coupling characteristics, completing non-contact torque transmission, realizing shaft seal-free power transmission, and turning dynamic sealing into static sealing, thereby meeting the requirements of leak-free transmission.

[0036] Specifically, the shaft system assembly includes a shaft 6, a sliding sleeve 12 fitted and connected to the shaft 6, and the upper end of the shaft 6 is fixedly connected to the permanent magnet inner rotor 5. The permanent magnet inner rotor 5 rotates under the magnetic coupling of the permanent magnet outer rotor 3, which can drive the shaft 6 to rotate synchronously.

[0037] See Figure 1 and Figure 4Furthermore, the shaft assembly also includes a bearing housing 10 and a mounting support 17. The bearing housing 10 is connected to the isolation sleeve 4, and the mounting support 17 is connected to the bottom of the pump body 13. The shaft 6 extends through the cavity of the bearing housing 10 and the eccentric stator 14 into the mounting support 17. The mounting support 17 serves to position and support the booster pump of this application. An upper alloy bearing assembly 9 and a lower alloy bearing assembly 16 are correspondingly installed in the bearing housing 10 and the mounting support 17, respectively, and are fitted onto the shaft 6. Both the upper alloy bearing assembly 9 and the lower alloy bearing assembly 16 are combinations of alloy sliding bearings and alloy rolling bearings, capable of withstanding radial forces generated by irregular movement of the medium, and possessing dry friction characteristics such as high temperature resistance, high pressure resistance, and wear resistance. The shaft system assembly of this application is a transmission shaft system supported by two-point alloy sliding bearings and two-point alloy rolling bearings, which ensures the balance of radial forces under various working conditions, greatly eliminates the influence of working load on the shaft system assembly, extends the working life of the shaft system assembly, and at the same time ensures the transmission accuracy of shaft 6 and the stability and safety of system operation.

[0038] Furthermore, the shaft assembly also includes a permanent magnet levitation bearing 8, which is mounted on a bearing housing 10. The fixed end of the permanent magnet levitation bearing 8 is fixed to the bearing housing 10, and its moving end is in close contact with the permanent magnet inner rotor 5 without clearance. The permanent magnet levitation bearing 8 can greatly eliminate the influence of gravity and working load on the shaft assembly.

[0039] Furthermore, the shaft assembly also includes a spacer sleeve 7, which fits onto the shaft 6. Specifically, the two ends of the spacer sleeve 7 contact the lower end of the permanent magnet inner rotor 5 and the upper end of the upper alloy bearing assembly 9, respectively. The function of the spacer sleeve 7 is the same as that of the alloy bearing assembly, which is to constrain the radial movement of the shaft 6 and withstand the radial force generated by irregular movement during the transmission of the medium.

[0040] See Figure 1 The pump transmission assembly also includes an upper liner 11 and a lower liner 15 fitted onto the shaft 6. The two liners and the two end face seals of the eccentric stator 14 together form the working space of the vane sleeve 12 and the vane 21, preventing the medium from entering the bearing housing 10 and the mounting support 17 and causing corrosion or damage to other components.

[0041] See Figure 2 The pump transmission assembly also includes a safety valve 19 disposed within the pump body 13, with both ends of the safety valve 19 connected to the medium suction chamber and the medium discharge chamber. When the pressure at the outlet pipe 18 exceeds the preset rated pressure, in order to avoid damage to the pump body 13 or other components, the safety valve 19 can be opened to transfer the medium at the outlet to the inlet for secondary transmission.

[0042] In specific assembly, this embodiment uses keys and screws to connect the permanent magnet outer rotor 3 and the motor 1 into a single active component, and uses round nuts and keys to connect the permanent magnet inner rotor 5 and the shaft 6 into a single passive component. Screws, sealing rings, and the motor support 2 are used to connect the isolation sleeve 4 and the bearing housing 10 into a single static sealing component to ensure no leakage of the medium. Screws are used to connect the motor 1 and the motor support 2 into a single unit; screws and sealing rings are used to connect the motor support 2, the bearing housing 10, and the pump body 13 into a single unit; and screws and sealing rings are used to connect the mounting bracket 17 and the pump body 13 into a single unit. A key is used to connect the vane sleeve 12 and the shaft 6 into a single rotating component, and a suitable fit is used to embed the vane 21 into the vane sleeve 12 to form the working component. The upper liner 11 and lower liner 15 are installed on the inner sides of the bearing housing 10 and the mounting support 17 using a reasonable fit. The upper liner 11, lower liner 15, eccentric stator 14, and vane sleeve 12 together form the working chamber of vane 21. The eccentric stator 14 and pump body 13 are connected as a whole by a key connection. The two gaps formed by the protrusions of the outer wall 14 of the eccentric stator and the inner wall of the pump body 13 respectively constitute the medium suction chamber and the medium discharge chamber. The gap between the eccentric stator 14 and the vane sleeve 12 forms the expansion and contraction space of vane 21. The outlet pipe 18 and pump body 13 are connected as a single unit using screws and sealing rings, serving as the outlet for medium discharge. The inlet pipe 20 and pump body 13 are connected as a single unit using screws and sealing rings, serving as the inlet for medium suction. Alloy sliding bearings and alloy rolling bearings are mounted on shaft 6 with appropriate clearances to form upper alloy bearing assembly 9 and lower alloy bearing assembly 16, respectively. A spacer sleeve 7 is also mounted on shaft 6 with appropriate clearances. The upper alloy bearing assembly 9 and lower alloy bearing assembly 16 are fixed within bearing housing 10 and mounting support 17 using snap rings and round nuts. The fixed end of permanent magnet levitation bearing 8 is fixed to bearing housing 10 with appropriate clearances, and the moving end of permanent magnet levitation bearing 8 makes zero-clearance contact with the permanent magnet inner rotor 5. A safety valve 19 and pump body 13 are connected as a single unit using screws and sealing rings to form a constant pressure control device. When the system pressure in the outlet pipeline exceeds the set rated pressure, safety valve 19 automatically opens, allowing the medium to circulate within pump body 13, ensuring system safety.

[0043] During operation, the permanent magnet outer rotor 3 is driven by motor 1 to rotate at a low speed. Due to the magnetic field between the permanent magnet inner rotor 5 and the permanent magnet outer rotor 3, the permanent magnet outer rotor 3 drives the permanent magnet inner rotor 5 inside the isolation sleeve 4 to rotate synchronously through magnetic coupling characteristics. This drives the shaft 6 to rotate, transmitting the torque of motor 1 to the working component slide 21 without contact. The rotation of shaft 6 drives the slide sleeve 12 to rotate. Under the combined action of centrifugal force and eccentric stator, the slide 21 reciprocates in the working chamber to achieve the intake, compression, and discharge of the medium. Specifically:

[0044] See Figure 5The external medium enters through inlet B (indicated by the arrow) of inlet pipe 20. When the vane sleeve 12 rotates counterclockwise as shown in the diagram, the vane 21 extends forward from its minimum position (point C). Centrifugal force causes the vane 21 inside the vane sleeve 12 to rotate tightly against the inner wall of the eccentric stator 14. The volume between the two vanes 21 at the inlet gradually increases, creating a negative pressure that draws the medium into the suction chamber. When the vane 21 reaches its maximum position (point D) of the eccentric stator 14, it begins to retract inward. The volume between the two vanes 21 at the outlet gradually decreases, creating a positive pressure that discharges the medium into the discharge chamber. The medium flows out from outlet B (indicated by the arrow) of outlet pipe 18. When the system pressure in the outlet pipeline exceeds the set rated pressure, the safety valve 19 automatically opens, and the medium circulates from the outlet to the inlet within the pump, ensuring safe system operation. In case of overload, the permanent magnet inner rotor 5 and the permanent magnet outer rotor 3 slip relative to each other, protecting the motor 1.

[0045] This application utilizes the periodic, continuous movement of a sliding vane to change the working volume, thus achieving the intake and discharge of the medium. The isolation sleeve is a non-rotating component and is sealed to the bearing housing and pump body, ensuring leak-free medium transmission. This achieves leak-free magnetic drive, medium conveying, and sealing functions, offering advantages such as leak-free operation, compact structure, reliable operation, maintenance-free operation, and long service life. It avoids environmental pollution and personal injury caused by medium leakage and is suitable for leak-free conveying of gases such as helium-xenon mixtures and volatile liquids such as gasoline, propane, and ethylene. It can be widely used in media transmission in industries such as petroleum and chemical processing.

[0046] 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.

[0047] 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 shaftless permanent magnet drive booster pump, characterized in that, It includes a power assembly, a magnetic rotor assembly, a shaft system assembly, and a pump transmission assembly connected in sequence; The pump transmission assembly includes a pump body with an inlet pipe and an outlet pipe connected to it. An eccentric stator is disposed within the pump body, and a medium channel is provided on the eccentric stator. Two protrusions corresponding to the eccentric stator are provided on the inner wall of the pump body. The eccentric stator and the two protrusions are in contact and sealed to divide the space between the eccentric stator and the pump body into a medium suction chamber and a medium discharge chamber. The inlet pipe is connected to the medium suction chamber, and the outlet pipe is connected to the medium discharge chamber. The shaft assembly extends into the cavity of the eccentric stator, and a vane sleeve is connected to the outer wall of the shaft assembly. Multiple vanes are embedded in the vane sleeve along its outer wall towards the center.

2. The shaftless permanent magnet drive booster pump according to claim 1, characterized in that, The pump transmission assembly also includes two bushings fitted onto the shaft assembly. The two bushings and the two end face seals of the eccentric stator together constitute the working space of the vane sleeve and the vane.

3. The shaftless permanent magnet drive booster pump according to claim 2, characterized in that, The pump transfer assembly also includes a safety valve disposed within the pump body, the safety valve being connected to the medium suction chamber and the medium discharge chamber.

4. The shaftless permanent magnet drive booster pump according to claim 1, characterized in that, The magnetic rotor assembly includes an isolation sleeve and a permanent magnet outer rotor and a permanent magnet inner rotor corresponding to the position. The isolation sleeve covers the permanent magnet inner rotor. The permanent magnet outer rotor is connected to the power assembly, and the permanent magnet inner rotor is connected to the shaft assembly.

5. The shaftless permanent magnet drive booster pump according to claim 4, characterized in that, The shaft system assembly includes a shaft, and the sliding sleeve is fitted and connected to the shaft.

6. The shaftless permanent magnet drive booster pump according to claim 5, characterized in that, The shaft assembly also includes a bearing housing and a mounting bracket. The bearing housing is connected to the isolation sleeve, and the mounting bracket is connected to the pump body. The shaft passes through the bearing housing and extends from the eccentric stator into the mounting bracket.

7. The shaftless permanent magnet drive booster pump according to claim 6, characterized in that, Both the bearing housing and the mounting bracket are equipped with alloy bearing assemblies, which are fitted onto the shaft.

8. The shaftless permanent magnet drive booster pump according to claim 6, characterized in that, The shaft system assembly also includes a permanent magnet levitation bearing, the fixed end of which is fixed to the bearing housing, and its moving end is in close contact with the permanent magnet inner rotor without clearance.

9. The shaftless permanent magnet drive booster pump according to claim 5, characterized in that, The shaft assembly also includes a spacer sleeve that fits onto the shaft.

10. The shaftless permanent magnet drive booster pump according to claim 1, characterized in that, The power assembly includes a motor, which is mounted on a motor bracket. The motor bracket is connected in sequence to the magnetic rotor assembly and the pump body.

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