A magnetically driven rotor pump

Abstract

This invention relates to the field of rotor pump technology, and more particularly to a magnetically driven rotor pump, comprising a pump casing, rotors, a drive shaft, and drive gears, and further comprising: a magnetic drive connection device; the drive shaft includes a first rotating shaft and a second rotating shaft that are parallel to each other; the pump casing has a first cavity and a second cavity inside; there are two rotors, respectively disposed on the first rotating shaft and the second rotating shaft; there are two drive gears, respectively disposed on the first rotating shaft and the second rotating shaft, and the two drive gears mesh with each other; the magnetic drive connection device is connected to the first rotating shaft, and the magnetic drive connection device is sealed with the pump casing through its isolation structure, so that the first rotating shaft exiting the pump casing achieves a static seal, and external driving force is transmitted to the first rotating shaft without contact. This application has stronger applicability, higher safety in use, longer service life of the static seal, more compact overall structure, and more convenient and faster installation, disassembly, and maintenance.

Description

Technical Field

[0001] This invention relates to the field of rotor pump technology, and more particularly to a magnetically driven rotor pump. Background Technology

[0002] Rotary pumps, as a type of positive displacement pump, are widely used in petrochemical, fine chemical, pharmaceutical and food industries due to their advantages such as low speed, stable delivery, no pulsation and low shear force on materials. They are especially suitable for conveying fluid media with high viscosity, high risk or extremely high purity requirements.

[0003] However, as industrial applications increasingly demand higher levels of equipment safety, compactness, and ease of maintenance, existing traditional rotor pumps are gradually revealing the following technical shortcomings: Firstly, traditional rotary pumps typically employ a single-end through-shaft drive. To prevent leakage of the pumped medium from the shaft bore, a dynamic sealing device such as a mechanical seal or packing seal must be installed between the drive shaft and the pump casing. During long-term high-speed operation, or when conveying fluids that easily crystallize, contain solid particles, or are highly corrosive, the friction pairs of the dynamic seals are prone to wear and aging. Once the seal fails, not only will material waste occur, but when conveying highly toxic, flammable, or explosive media, it can also lead to serious safety and environmental accidents. Secondly, the working principle of a twin-shaft rotor pump requires that the two shafts rotate synchronously in opposite directions. Existing technology typically uses an external, independent synchronous gearbox to achieve this requirement. This split-type series architecture of "pump head + coupling + external gearbox + motor" results in a large overall axial dimension of the equipment and an inefficient spatial layout. It not only occupies a large area but also requires high precision in the alignment and installation of each module.

[0004] Finally, most existing rotary pumps have a monolithic pump casing, resulting in a highly congested internal structure for the shaft, bearings, gears, and rotor. This lack of modular design limits the operating space during factory assembly or when replacing vulnerable internal parts. Maintenance personnel often need to completely disassemble the machine to access core components, making installation, disassembly, and maintenance time-consuming and labor-intensive, severely impacting production efficiency. Summary of the Invention

[0005] This application provides a magnetically driven rotor pump to solve at least one of the above-mentioned problems in the prior art, and adopts the following technical solution: A magnetically driven rotor pump includes a pump casing, rotors, a drive shaft, and drive gears, and further includes a magnetic drive connection device. The drive shaft includes a first rotating shaft and a second rotating shaft that are parallel to each other. The pump casing has a first cavity and a second cavity inside. There are two rotors, which are respectively disposed on the first rotating shaft and the second rotating shaft and located in the first cavity. There are two drive gears, which are respectively disposed on the first rotating shaft and the second rotating shaft and located in the second cavity, and the two drive gears mesh with each other. The magnetic drive connection device is connected to the first rotating shaft, and the magnetic drive connection device is sealed with the pump casing through its isolation structure, so that the first rotating shaft exiting the pump casing achieves a static seal and transmits external driving force to the first rotating shaft without contact.

[0006] Preferably, the magnetic drive connection device includes an inner magnetic rotor, an isolation sleeve, and an outer magnetic rotor; the inner magnetic rotor is fixedly connected to the end of the first rotating shaft, and the open end of the isolation sleeve is sealed and fixed to one end of the pump housing, covering and sealing the inner magnetic rotor within the sealed space formed by the pump housing and the isolation sleeve; the outer magnetic rotor is sleeved outside the isolation sleeve and is used to connect to an external power source.

[0007] Preferably, a clamping block is provided at one end of the first rotating shaft near the inner magnetic rotor. The clamping block is fixedly connected to the first rotating shaft by bolts, and the side end face of the clamping block abuts against the end face of the inner magnetic rotor to form an axial limit on the inner magnetic rotor.

[0008] Preferably, the pump casing includes a first end cover, a casing body, and a second end cover, wherein the first cavity and the second cavity are disposed in the internal space formed by the casing body and the second end cover.

[0009] Preferably, the first end cap has a third cavity inside, which is used to accommodate at least one end of the drive shaft.

[0010] Preferably, it further includes: a first bearing group and a second bearing group; the first bearing group and the second bearing group are rolling bearings respectively disposed on the first rotating shaft and the second rotating shaft, and the first bearing group is located between the rotor and the transmission gear, and the second bearing group is located at the end of the first rotating shaft and the second rotating shaft away from the magnetic transmission connection device.

[0011] Preferably, the pump casing is further provided with two heat insulation sleeves, which are respectively provided on both sides of the pump casing.

[0012] Preferably, the bottom of the pump casing is provided with a foot, which is fixedly connected to the pump casing.

[0013] Preferably, the drive shaft and the rotor are respectively provided with matching splines to realize the transmission connection between the drive shaft and the rotor.

[0014] Preferably, it further includes an elastic gasket, which is disposed on the first and second rotating shafts, and the elastic gasket is used to provide axial preload for the components on the first and second rotating shafts.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This rotary pump utilizes a magnetic transmission connection device consisting of an inner magnetic rotor, an isolation sleeve, and an outer magnetic rotor. The open end of the isolation sleeve is sealed and fixed to one end of the pump casing, sealing the inner magnetic rotor and the first rotating shaft within the sealed space formed by the pump casing and the isolation sleeve, thus achieving a static seal. External power drives the inner magnetic rotor and the first rotating shaft to rotate synchronously without contact via the outer magnetic rotor, eliminating the need for a dynamic sealing mechanism. This structure effectively eliminates the problems of easy wear and aging of traditional mechanical seals and other dynamic seals, effectively solving the risk of media leakage and enhancing applicability. Furthermore, by adding a clamping block to the end face of the first rotating shaft near the inner magnetic rotor and rigidly fixing it to the first rotating shaft with bolts, its side end face abuts against the end face of the inner magnetic rotor. This clamping block acts as a physical stop, forming an axial limit on the inner magnetic rotor, effectively resisting axial thrust during operation, preventing axial movement of the inner magnetic rotor on the first rotating shaft that could damage the equipment, greatly improving equipment safety, and significantly extending the effective life of the static seal.

[0016] 2. This rotor pump integrates a first and a second parallel rotating shaft, along with two meshing transmission gears fixed to them, into a second cavity inside the pump casing, forming an integrated cavity transmission architecture. This structure not only eliminates the need for a separate external gearbox structure in traditional equipment, improving the compactness and assembly efficiency of the entire machine, but also allows for flexible adaptation to the internal operating conditions of the cavity for different fluid media, significantly improving the applicability and service life of the equipment.

[0017] 3. The pump casing of this rotor pump adopts a three-section modular structure consisting of a first end cover, a casing body, and a second end cover. A third cavity is provided inside the first end cover to accommodate and assist in supporting the end of the rotating shaft. The overall structure of the pump casing makes the installation, disassembly, and maintenance of the rotating shaft, transmission gears, and rotor inside the first and second cavities more convenient and faster. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be discussed below. Obviously, the technical solutions described in conjunction with the accompanying drawings are only some embodiments of the present invention. For those skilled in the art, other embodiments and their accompanying drawings can be obtained based on the embodiments shown in these drawings without creative effort.

[0019] Figure 1 This is a cross-sectional view of the entire invention; Figure 2 This is a schematic diagram of the magnetic drive connection device of the present invention; Figure 3 This is a schematic diagram of the structure of the housing body of the present invention; Figure 4 This is a schematic diagram of the structure of the thermal insulation sleeve of the present invention; Figure 5 This is a schematic diagram of the rotor structure of the present invention; Figure 6 This is a schematic diagram of the transmission shaft of the present invention.

[0020] Reference numerals: 1. Pump casing; 101. First cavity; 102. Second cavity; 103. First end cover; 104. Casing body; 105. Second end cover; 106. Third cavity; 2. Rotor; 301. First shaft; 302. Second shaft; 4. Magnetic drive connection device; 401. Inner magnetic rotor; 402. Isolation sleeve; 403. Outer magnetic rotor; 5. Pressing block; 6. Transmission gear; 701. First bearing assembly; 702. Second bearing assembly; 8. Insulation sleeve clamp; 9. Foot. Detailed Implementation

[0021] The technical solutions of various embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0024] Before describing the structure of this embodiment in detail, it should be noted that traditional rotary pumps typically use mechanical seals to allow the drive shaft to pass through the pump body and connect to an external motor. Such dynamic seals are prone to wear and leakage during long-term operation or when conveying high-pressure, hazardous, or easily crystallizing fluids. Furthermore, the synchronous gears in traditional rotary pumps mostly use external independent gearboxes, resulting in a large axial dimension of the entire machine, high assembly precision requirements, and a high susceptibility to vibration.

[0025] To address the aforementioned technical challenges, this invention provides a magnetically driven rotor pump that employs an integrated architecture with built-in gear transmission and magnetic static seal drive, effectively eliminating the risk of shaft seal leakage. Example:

[0026] like Figure 1 As shown: This embodiment provides a magnetically driven rotor pump, including a pump housing 1, a rotor 2, a drive shaft and a drive gear 6, and a magnetic drive connection device 4.

[0027] To achieve high efficiency and compactness in transmission, the drive shaft includes a first rotating shaft 301 and a second rotating shaft 302 that are parallel to each other. The pump housing 1 is internally divided into a first cavity 101 and a second cavity 102.

[0028] like Figures 5-6 As shown: There are two rotors 2. External splines are formed on the connection surfaces of the first shaft 301 and the second shaft 302 with the rotors 2. Internal splines that mate with the external splines are formed on the inner diameter of the rotors 2 to achieve torque transmission. Optionally, a key, expansion sleeve, or other connection method can also be used. The rotors 2 are located within the first cavity 101 and are used to transport the fluid medium. There are also two transmission gears 6, respectively mounted on the first shaft 301 and the second shaft 302, connected to the first shaft 301 and the second shaft 302 via a key, and located within the second cavity 102. The two transmission gears 6 mesh with each other to ensure that the two rotors 2 can rotate synchronously and in opposite directions.

[0029] To ensure that the huge radial force brought by the high-pressure fluid does not cause the rotor 2 to deflect under contactless transmission, this embodiment is equipped with a high-rigidity bearing support system, including a first bearing group 701 and a second bearing group 702.

[0030] The first bearing assembly 701 uses rolling bearings and is respectively installed on the first rotating shaft 301 and the second rotating shaft 302, and is positioned between the rotor 2 and the transmission gear 6. The second bearing assembly 702 also uses rolling bearings and is installed at the end of the two rotating shafts away from the magnetic device.

[0031] To ensure transmission reliability, the transmission gear 6, the first bearing assembly 701, and the second bearing assembly 702 in this embodiment are all made of special engineering plastics with self-lubricating properties, specifically polyetheretherketone (PEEK). During the manufacturing process of this PEEK material, its matrix is ​​composite-doped with self-lubricating modified fillers such as polytetrafluoroethylene (Teflon) and graphite, thereby giving the transmission gear 6, the first bearing assembly 701, and the second bearing assembly 702 high wear resistance and solid self-lubricating properties.

[0032] By embedding the transmission gear 6 within the second cavity 102, an integrated cavity transmission architecture is constructed, eliminating the traditional external gearbox and significantly reducing the overall size of the machine. The arrangement of the first cavity 101 and the second cavity 102 improves the compactness and assembly efficiency of the entire machine. Simultaneously, the internal space can flexibly adapt to different media properties to varying internal operating conditions. Optionally, the first cavity 101 and the second cavity 102 can be in a connected state. In this state, the fluid medium delivered by the pump can enter the second cavity 102 as a lubricant. Building upon the self-lubricating properties of the transmission gear 6, the first bearing assembly 701, and the second bearing assembly 702, this fluid medium provides further auxiliary lubrication, eliminating the need for a separate gear lubrication system and resulting in a simpler and more compact overall structure. Alternatively, the first cavity 101 and the second cavity 102 can be sealed and isolated. In this state, media that easily cause transmission wear can effectively prevent entering the transmission area, thereby protecting components such as the transmission gear 6 within the second cavity 102 from wear and extending the equipment's service life. Different spatial connection relationships can be selected based on different fluid media to meet the needs of complex industrial applications.

[0033] like Figure 2 As shown: The magnetic drive connection device 4 is connected to the first rotating shaft 301. Specifically, the magnetic drive connection device 4 includes an inner magnetic rotor 401, an isolation sleeve 402, and an outer magnetic rotor 403. The inner magnetic rotor 401 is fixedly connected to the power input end of the first rotating shaft 301. Optionally, a flat key is provided on the first rotating shaft 301 and keyedly connected to the inner magnetic rotor 401. The isolation sleeve 402 is bell-shaped with one open end. Its open end is sealed and fixed to one end of the pump housing 1 by a flange and a static sealing ring, thereby completely covering and sealing the inner magnetic rotor 401 within the sealed space formed by the pump housing 1 and the isolation sleeve 402. The outer magnetic rotor 403 is sleeved outside the isolation sleeve 402 and is connected to an external drive source.

[0034] During operation, an external motor drives the outer magnetic rotor 403 to rotate. Due to the penetrating characteristics of magnetic lines of force, the magnetic field of the outer magnetic rotor 403 penetrates the non-magnetic isolation sleeve 402 without contact, and using the principle of magnetic coupling, pulls the inner magnetic rotor 401 to rotate synchronously, thereby driving the first rotating shaft 301 to rotate. This structure transforms the traditional "dynamic seal" into a "static seal". In addition, the magnetically driven rotor pump in this embodiment is designed to operate at a low speed (for example, it can be controlled at around 200 r / min). The low-speed operation significantly reduces the frictional heating and eddy current temperature rise inside the magnetic drive connection device, eliminates the risk of irreversible demagnetization of magnetic components at high temperatures, and greatly improves the safety of the equipment during long-term operation.

[0035] Since the inner magnetic rotor 401 has a large mass and generates complex magnetic axial tension when transmitting large torque, if it is not securely fixed, it is very easy for the inner magnetic rotor to move axially on the first rotating shaft 301, thereby damaging the isolation sleeve 402 by rubbing against the rotor.

[0036] Therefore, in this embodiment, a clamping block 5 is provided at one end of the first rotating shaft 301 near the inner magnetic rotor 401. The clamping block 5 is locked to the end face of the first rotating shaft 301 by a central bolt, and the side end face of the clamping block 5 abuts against the end face of the inner magnetic rotor 401. The clamping block 5 forms a physical stop, effectively resisting the axial thrust generated under alternating operating conditions, ensuring that the magnetic poles of the inner magnetic rotor 401 and the outer magnetic rotor 403 are always aligned, preventing slippage, and greatly improving the safety of equipment operation.

[0037] To facilitate the assembly and routine maintenance of the aforementioned complex components, the pump casing 1 adopts a three-section modular design, comprising a first end cover 103, a casing body 104, and a second end cover 105. The first cavity 101 is located on the side of the casing body 104 furthest from the magnetic drive connection device 4, and the second cavity 102 is located within the splicing space between the casing body 104 and the second end cover 105. The first end cover 103 contains a third cavity 106 for accommodating and supporting the non-powered end of the drive shaft.

[0038] Furthermore, considering that when conveying materials with temperature, the warm medium will cause the temperature of the internal transmission components of the pump body to rise, leading to thermal expansion and contraction and displacement of parts, this embodiment adds elastic gaskets to the transmission components of the first shaft 301 and the second shaft 302. These elastic gaskets increase the axial preload on the components of the shafts. When the pump expands or stretches due to the temperature of the medium during operation, the elastic gaskets can effectively absorb and compensate for the displacement through their elastic deformation without affecting the original preload, thus ensuring that the fixed positions of the bearings and transmission gears 6 do not loosen and ensuring that the transmission components always maintain stable and precise meshing.

[0039] The first bearing assembly 701 can simultaneously withstand the huge radial load generated by the fluid's work and the axial load caused by gear meshing / magnetic coupling; the second bearing assembly 702 provides extremely strong radial support. This combined bearing layout effectively reduces the runout of the first shaft 301 and the second shaft 302, ensuring the stability of the clearance between the rotor 2 and the inner wall of the pump casing 1 during non-contact operation.

[0040] For temperature-sensitive materials such as high-viscosity adhesives and resins, solidification at low temperatures can easily lead to rotor jamming or even damage to the magnetic coupling. Therefore, such as... Figures 3-4 As shown, heat insulation sleeves 8 are symmetrically provided on both sides of the outside of the pump casing 1. In addition, a sturdy foot 9 is fixedly connected to the bottom of the pump casing 1 to anchor the entire pump to the base and further absorb the vibration generated during the operation of the whole machine.

[0041] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects. The scope of the invention is defined by the appended claims, not by the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0042] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A magnetically driven rotor pump, comprising a pump casing (1), a rotor (2), a drive shaft, and a drive gear (6), characterized in that, Also includes: Magnetic drive connection device (4); The drive shaft includes a first rotating shaft (301) and a second rotating shaft (302) that are parallel to each other. The pump casing (1) is provided with a first cavity (101) and a second cavity (102). There are two rotors (2), which are respectively mounted on the first rotating shaft (301) and the second rotating shaft (302) and are located in the first cavity (101); There are two transmission gears (6), which are respectively located on the first rotating shaft (301) and the second rotating shaft (302) and are located in the second cavity (102). The two transmission gears (6) mesh with each other. The magnetic drive connection device (4) is connected to the first rotating shaft (301). The magnetic drive connection device (4) is sealed with the pump housing (1) through its isolation structure, so that the first rotating shaft (301) passes through the pump housing (1) to achieve static sealing, and external driving force is transmitted to the first rotating shaft (301) without contact.

2. The magnetically driven rotor pump according to claim 1, characterized in that: The magnetic drive connection device (4) includes an inner magnetic rotor (401), an isolation sleeve (402), and an outer magnetic rotor (403). The inner magnetic rotor (401) is fixedly connected to the end of the first rotating shaft (301). The open end of the isolation sleeve (402) is sealed and fixed to one end of the pump housing (1), covering and sealing the inner magnetic rotor (401) within the sealed space formed by the pump housing (1) and the isolation sleeve (402). The outer magnetic rotor (403) is sleeved outside the isolation sleeve (402) and is used to connect to an external power source.

3. A magnetically driven rotor pump according to claim 2, characterized in that: The first rotating shaft (301) is provided with a clamping block (5) near one end of the inner magnetic rotor (401). The clamping block (5) is fixedly connected to the first rotating shaft (301) by bolts, and the side end face of the clamping block (5) abuts against the end face of the inner magnetic rotor (401) to form an axial limit on the inner magnetic rotor (401).

4. A magnetically driven rotor pump according to claim 1, characterized in that: The pump casing (1) includes a first end cap (103), a casing body (104), and a second end cap (105). The first cavity (101) and the second cavity (102) are located in the internal space formed by the casing body (104) and the second end cap (105).

5. A magnetically driven rotor pump according to claim 4, characterized in that: The first end cap (103) has a third cavity (106) inside, which is used to accommodate at least one end of the drive shaft.

6. A magnetically driven rotor pump according to claim 1, characterized in that, Also includes: The first bearing assembly (701) and the second bearing assembly (702) are rolling bearings respectively disposed on the first rotating shaft (301) and the second rotating shaft (302). The first bearing assembly (701) is located between the rotor (2) and the transmission gear (6), and the second bearing assembly (702) is located at the ends of the first rotating shaft (301) and the second rotating shaft (302) away from the magnetic transmission connection device (4).

7. A magnetically driven rotor pump according to claim 1, characterized in that: The pump casing (1) is also provided with an insulation sleeve (8) on the outside. There are two insulation sleeves (8), which are respectively located on both sides of the pump casing (1).

8. A magnetically driven rotor pump according to claim 1, characterized in that: The bottom of the pump casing (1) is provided with a foot (9), which is fixedly connected to the pump casing (1).

9. A magnetically driven rotor pump according to claim 1, characterized in that: The drive shaft and the rotor (2) are respectively provided with matching splines to realize the transmission connection between the drive shaft and the rotor (2).

10. A magnetically driven rotor pump according to claim 1, characterized in that: It also includes an elastic gasket disposed on the first rotating shaft (301) and the second rotating shaft (302), the elastic gasket being used to provide axial preload for the components on the first rotating shaft (301) and the second rotating shaft (302).

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