Sealing structure for rotor assembly and sealed screw pump body

Abstract

The utility model discloses a sealing structure for a rotor assembly and a sealed screw pump body, and belongs to the technical field of screw pumps. Wherein the screw pump body comprises a rotor assembly and a sealing structure, the rotor assembly comprises a screw and a spiral sleeve, when materials are conveyed, the spiral sleeve is stressed to rotate and drives the screw to swing, conveying of the materials is achieved, the sealing structure comprises a liquid inlet body, a straight-through pipe, a motor shell and a discharging body, and the liquid inlet body, the straight-through pipe, the motor shell and the discharging body are sequentially connected. The liquid inlet body, the straight-through pipe, the motor shell and the discharging body are communicated with one another and form a containing cavity, the rotor assembly is arranged in the containing cavity, and when the motor is used, the outer ends of the liquid inlet body and the discharging body are connected with external equipment respectively, so that the rotor assembly is arranged in the closed containing cavity which is defined by the liquid inlet body, the straight-through pipe, the motor shell and the discharging body and isolated from the outside. The screw pump body is arranged in the closed pipe cavity, the pump spiral sleeve is driven by magnetic force to rotate, a rotating part is not in dynamic seal with the outside, and leakage is avoided.

Description

Technical Field

[0001] The utility model relates to a sealing structure for a rotor assembly and also relates to a sealed screw pump body comprising the sealing structure for the rotor assembly, belonging to the technical field of screw pumps. Background Art

[0002] Screw pumps are categorized by the number of screws: single-screw pumps, twin-screw pumps, and triple-screw pumps. A single-screw pump is a single-screw conveying pump and a rotor-type positive displacement pump. It transports liquids by meshing the screw and bushing to produce volume changes between the suction and discharge chambers. It is an internally meshing, enclosed screw pump. Its main working components consist of a bushing (stator) with a double-ended helical cavity and a single-ended helical screw (rotor) meshing within the stator cavity. When the input shaft, through a universal joint, drives the rotor in planetary rotation around the center of the stator, the stator-rotor pair continuously meshes to form a sealed chamber. This sealed chamber undergoes uniform axial motion while maintaining a constant volume, transporting the conveying medium from the suction end through the stator-rotor pair to the discharge end. Its greatest features include strong adaptability to media, stable flow, minimal pressure pulsation, and high self-priming capacity. It is widely used, primarily in the shipbuilding, petroleum, construction, mining, and chemical industries.

[0003] The screw pump drive is composed of multiple components, including an electric motor, a speed reducer, and a coupling. These components work together to ensure the proper operation and material delivery of the screw pump, significantly impacting its performance and efficiency. However, the separate structure of the motor and pump, coupled with an externally connected transmission method, requires sealing devices between the inlet cavity and the bearing seat. However, regardless of the design, gaps will always exist, making a completely sealed environment impossible. Furthermore, as the working environment deteriorates and the product ages, leakage and wear can easily occur, allowing the medium to affect the pump, causing damage and ultimately affecting its performance.

[0004] The Chinese invention patent application with application number 202110427418.0 discloses an all-metal screw pump oil production device with an integrated rotor and pump. This invention reduces the overall length of the unit by integrating the machine and pump to improve the passability of the inclination section of horizontal wells with medium and short curvature radii. However, its shell structure, internal component structure, etc. are relatively complex, and the sealing performance is not taken into consideration, making it inconvenient to install, use, and maintain. Summary of the Invention

[0005] In order to overcome the above-mentioned deficiencies of the prior art, the utility model provides a sealing structure for a rotor assembly and a sealed screw pump body.

[0006] The technical solution adopted by the present invention is: designing a sealing structure for a rotor assembly, the sealing structure is used to accommodate the rotor assembly, which includes a liquid inlet, a straight-through pipe, a motor housing and a discharge body, the liquid inlet, the straight-through pipe, the motor housing and the discharge body are connected in sequence, the four are interconnected and form a accommodating chamber, the rotor assembly is arranged in the accommodating chamber, when in use, the outer ends of the liquid inlet and the discharge body are respectively connected to external equipment, so that the rotor assembly is placed in a closed accommodating chamber surrounded by the liquid inlet, the straight-through pipe, the motor housing and the discharge body and isolated from the outside world.

[0007] This design also discloses a sealed screw pump body, which includes a rotor assembly and the sealing structure described above. The rotor assembly includes a screw and a spiral sleeve. The spiral sleeve is arranged in a motor housing and can rotate. The screw and the spiral sleeve are meshed to form multiple medium cavities. The screw can swing in an eccentric circle. When conveying materials, the spiral sleeve is forced to rotate and drive the screw to swing, thereby realizing material conveying.

[0008] Furthermore, the rotor assembly also includes a permanent magnet rotor, and the sealing structure also includes a stator coil. The permanent magnet rotor and the stator coil are respectively arranged in the motor housing. The permanent magnet rotor is rotatably arranged, the spiral sleeve is fixedly connected to the permanent magnet rotor, the stator coil is fixedly arranged, and the stator coil is electrically connected to a power supply. The permanent magnet rotor rotates under the action of the stator coil.

[0009] Furthermore, the rotor assembly also includes a fixed end universal joint, a universal swing shaft and a movable end universal joint. The fixed end universal joint is fixedly arranged in a sealing structure, and the two ends of the universal swing shaft are respectively hinged to the fixed end universal joint and the movable end universal joint. The two ends of the universal swing shaft can swing in different directions relative to the fixed end universal joint and the movable end universal joint, and the screw is connected to the movable end universal joint.

[0010] Furthermore, the rotor assembly further includes a transmission pin, and both ends of the universal swing shaft are hinged to the fixed end universal joint and the movable end universal joint respectively through the transmission pin.

[0011] Furthermore, the sealing structure also includes a fixed support, a fixed support is arranged between the straight-through pipe and the liquid inlet, the fixed universal joint is installed on the fixed support, and a guide channel for connecting the liquid inlet and the straight-through pipe is opened on the fixed support, and the guide channel is arranged in a circumferential array around the fixed support.

[0012] Furthermore, the motor housing is provided with a cylindrical through cavity and an annular closed cavity, the stator coil is provided in the annular closed cavity, and the permanent magnet stator is provided in the cylindrical through cavity.

[0013] Furthermore, the sealing structure also includes a bearing and a mechanical seal. An annular boss is provided in the middle of the permanent magnet rotor, bearings are provided at both ends of the annular boss, and a mechanical seal is provided on the outside of the bearing.

[0014] Furthermore, the liquid inlet and discharge body are both trumpet-shaped structures, the straight-through pipe is a circular tube structure, a tubular body extends from each end of the motor housing, and the liquid inlet, straight-through pipe, motor housing and discharge body are connected with flange lock bolts between adjacent ones. The outer ends of the liquid inlet and discharge body are also respectively provided with flanges for connection with external equipment.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] This utility model places the entire rotating structure of the screw pump within a sealed chamber formed by the liquid inlet, straight-through pipe, motor housing, and discharge body. This prevents the rotating components from being dynamically sealed from the outside world, preventing leakage. The sealed structure, comprised of the liquid inlet, straight-through pipe, motor housing, and discharge body, offers a simple and reliable structure, a tighter connection, and enhanced integrity. The screw pump's simple housing structure and internal componentry ensure a secure seal, making installation, operation, and maintenance easy and reliable, ensuring long-lasting performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a schematic cross-sectional view of the screw pump of the present invention.

[0019] Figure 2 This is an axonometric diagram of the screw pump of the utility model.

[0020] In the figure: 1. Fixed end universal joint; 2. Universal swing shaft; 3. Movable end universal joint; 4. Screw; 5. Screw sleeve; 6. Drive pin; 7. Fixed support; 8. Straight pipe; 9. Motor housing; 10. Stator coil; 11. Permanent magnet rotor; 12. Guide channel; 13. Boss; 14. Bearing; 15. Mechanical seal; 16. Liquid inlet; 17. Discharge body. DETAILED DESCRIPTION

[0021] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0022] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0023] Example 1

[0024] like Figure 1 and Figure 2 As shown, a sealing structure for a rotor assembly is used to accommodate the rotor assembly. The sealing structure includes a liquid inlet 16, a straight pipe 8, a motor housing 9, and a discharge body 17. The liquid inlet 16, straight pipe 8, motor housing 9, and discharge body 17 are connected in sequence and communicate with each other to form a accommodating chamber. The rotor assembly is disposed in the accommodating chamber. During use, the outer ends of the liquid inlet 16 and discharge body 17 are respectively connected to external equipment, so that the rotor assembly is placed in a closed accommodating chamber surrounded by the liquid inlet 16, straight pipe 8, motor housing 9, and discharge body 17, which is isolated from the outside world. The rotating component has no dynamic seal with the outside world, and no leakage occurs.

[0025] Example 2

[0026] This embodiment discloses a sealed screw pump body, which includes a rotor assembly and the sealing structure described in Example 1, wherein the rotor assembly includes a screw 4 and a spiral sleeve 5, wherein the spiral sleeve 5 is arranged in a motor housing 9 and can rotate, wherein the screw 4 and the spiral sleeve 5 mesh and form a plurality of medium chambers, wherein the screw 4 can swing in an eccentric circle, and when conveying materials, the spiral sleeve 5 is forced to rotate and drive the screw 4 to swing, thereby realizing the conveying of materials. Specifically, when conveying materials, a sealed chamber is formed by the mutual engagement of the screw 4 and the spiral sleeve 5, and the rotation of the spiral sleeve 5 drives the change of the volume of the sealed chamber to generate a pressure difference, so that the volume of the sealed chamber becomes larger and the pressure becomes smaller. As the spiral sleeve 5 continues to rotate, the conveying of materials is realized. This sealed screw 4 pump body not only has no dynamic seal between the rotating parts and the outside world, and does not generate leakage, but also has a short axial distance, good overall structure permeability, small application restrictions, and is easy to install and use.

[0027] Example 3

[0028] This embodiment further optimizes and refines the screw pump structure based on the embodiment 2, specifically:

[0029] The sealed screw pump body described in this embodiment, its rotor assembly also includes a permanent magnet rotor 11, and the sealing structure also includes a stator coil 10. The permanent magnet rotor 11 and the stator coil 10 are respectively arranged in the motor housing 9, and the permanent magnet rotor 11 is rotatably arranged. The spiral sleeve 5 is fixedly connected to the permanent magnet rotor 11, and the stator coil 10 is fixedly arranged. The stator coil 10 is electrically connected to a power supply (not shown in the drawings). The permanent magnet rotor 11 rotates under the action of the stator coil 10. Here, reference is made to the technical means of adopting existing permanent magnet motors, and no detailed description is given.

[0030] Example 4

[0031] This embodiment further optimizes and refines the rotor assembly structure based on the third embodiment, specifically:

[0032] The rotor assembly further includes a fixed-end universal joint 1, a universal swing shaft 2, and a movable-end universal joint 3. The fixed-end universal joint 1 is fixedly disposed within a sealed structure. The ends of the universal swing shaft 2 are hingedly connected to the fixed-end universal joint 1 and the movable-end universal joint 3, respectively. The ends of the universal swing shaft 2 can swing in different directions relative to the fixed-end universal joint 1 and the movable-end universal joint 3, respectively. The screw 4 is connected to the movable-end universal joint 3. It will be understood that while one structural form of the swing arrangement of the screw 4 is provided herein, other swinging structural arrangements are also possible.

[0033] This embodiment also provides a preferred arrangement for hinged connections at both ends of the universal swing shaft 2: the rotor assembly further includes a drive pin 6, through which both ends of the universal swing shaft 2 are hingedly connected to the fixed end universal joint 1 and the movable end universal joint 3, respectively. The drive pins 6 at both ends are inserted into the ends of the universal swing shaft 2 from different directions, allowing the ends to rotate vertically and horizontally, respectively.

[0034] Example 5

[0035] This embodiment further optimizes and refines the sealing structure based on the fourth embodiment, specifically:

[0036] The sealing structure further includes a fixed support 7 disposed between the straight tube 8 and the liquid inlet 16. The fixed universal joint is mounted on the fixed support 7. The fixed support 7 is provided with a guide channel 12 for connecting the liquid inlet 16 and the straight tube 8. The guide channels 12 are arranged in a circumferential array around the fixed support 7. It is understood that the fixed support 7 can also be welded directly into the straight tube 8.

[0037] In this embodiment, the sealing structure also includes a bearing 14 and a mechanical seal 15. An annular boss 13 is provided in the middle of the permanent magnet rotor 11. Bearings 14 are provided at both ends of the annular boss 13 to limit position and assist sliding. A mechanical seal 15 is provided on the outside of the bearing 14.

[0038] Example 6

[0039] This embodiment further optimizes and refines the structure of the motor housing 9 on the basis of the embodiment 5, specifically:

[0040] The motor housing 9 is provided with a cylindrical through cavity and an annular closed cavity. The stator coil 10 is provided in the annular closed cavity, and the permanent magnet stator is provided in the cylindrical through cavity, which is convenient for installation and fixation, and the structure is reliable and durable.

[0041] Example 7

[0042] This embodiment further optimizes and refines the sealing structure based on the embodiment 6, specifically:

[0043] The liquid inlet 16 and the discharge body 17 are both trumpet-shaped structures, the straight-through pipe 8 is a circular tube structure, and a tubular body is extended from each end of the motor housing 9. The liquid inlet 16, the straight-through pipe 8, the motor housing 9 and the discharge body 17 are connected with adjacent flange lock bolts. The outer ends of the liquid inlet 16 and the discharge body 17 are also respectively provided with flanges for connection with external equipment. The connection is convenient and reliable. In order to improve the sealing performance, a sealing ring can also be provided between the flanges.

[0044] When using the utility model, the medium enters from the liquid inlet 16, enters the pump chamber (or straight pipe 8) through the guide channel 12 around the fixed support 7, and the relative movement of the spiral sleeve 5 and the screw 4 does work, transporting the medium to the discharge body 17 and discharged.

[0045] In addition, in the description of the present invention, unless otherwise specified, the terms "multiple," "multiple roots," and "multiple groups" mean two or more, and "several," "several roots," and "several groups" mean one or more. In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inside," and "outside" used to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings. These are intended solely to facilitate the description of the present invention and to simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first," "second," and "third" used are used solely for descriptive purposes and should not be construed as indicating or implying relative importance.

[0046] The specific embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A sealing structure for a rotor assembly, the sealing structure being used to accommodate the rotor assembly, characterized in that: The invention comprises a liquid inlet, a straight-through pipe, a motor housing and a discharge body, wherein the liquid inlet, the straight-through pipe, the motor housing and the discharge body are connected in sequence, the four are interconnected and form a accommodating chamber, and the rotor assembly is arranged in the accommodating chamber. When in use, the outer ends of the liquid inlet and the discharge body are respectively connected to external equipment, so that the rotor assembly is placed in a closed accommodating chamber surrounded by the liquid inlet, the straight-through pipe, the motor housing and the discharge body and isolated from the outside world.

2. A sealed screw pump body, characterized in that: It includes a rotor assembly and the sealing structure described in claim 1, the rotor assembly includes a screw and a spiral sleeve, the spiral sleeve is arranged in the motor housing and can rotate, the screw and the spiral sleeve are meshed to form a plurality of medium cavities, the screw can swing in an eccentric circle, when conveying materials, the spiral sleeve is forced to rotate and drive the screw to swing, thereby realizing the conveying of materials.

3. The sealed screw pump body according to claim 2, characterized in that: The rotor assembly also includes a permanent magnet rotor, and the sealing structure also includes a stator coil. The permanent magnet rotor and the stator coil are respectively arranged in the motor housing. The permanent magnet rotor is rotatably arranged, the spiral sleeve is fixedly connected to the permanent magnet rotor, the stator coil is fixedly arranged, and the stator coil is electrically connected to a power supply. The permanent magnet rotor rotates under the action of the stator coil.

4. The sealed screw pump body according to claim 3, characterized in that: The rotor assembly also includes a fixed end universal joint, a universal swing shaft and a movable end universal joint. The fixed end universal joint is fixedly arranged in a sealing structure. The two ends of the universal swing shaft are respectively hinged to the fixed end universal joint and the movable end universal joint. The two ends of the universal swing shaft can swing in different directions relative to the fixed end universal joint and the movable end universal joint. The screw is connected to the movable end universal joint.

5. The sealed screw pump according to claim 4, characterized in that: The rotor assembly further comprises a transmission pin, and both ends of the universal swing shaft are respectively hinged to the fixed end universal joint and the movable end universal joint through the transmission pin.

6. The sealed screw pump according to claim 5, characterized in that: The sealing structure also includes a fixed support, which is arranged between the straight-through pipe and the liquid inlet, and the fixed universal joint is installed on the fixed support. The fixed support is provided with a guide channel for connecting the liquid inlet and the straight-through pipe, and the guide channel is arranged in a circumferential array around the fixed support.

7. The sealed screw pump according to claim 6, characterized in that: The motor housing is provided with a cylindrical through cavity and an annular closed cavity. The stator coil is arranged in the annular closed cavity, and the permanent magnet rotor is arranged in the cylindrical through cavity.

8. The sealed screw pump according to claim 7, characterized in that: The sealing structure further includes a bearing and a mechanical seal. An annular boss is provided in the middle of the permanent magnet rotor, bearings are provided at both ends of the annular boss, and a mechanical seal is provided on the outside of the bearing.

9. The sealed screw pump according to claim 8, characterized in that: The liquid inlet and discharge body are both trumpet-shaped structures, the straight-through pipe is a circular tube structure, and a tubular body extends from each end of the motor housing. The liquid inlet, straight-through pipe, motor housing and discharge body are connected with flange lock bolts between adjacent ones, and the outer ends of the liquid inlet and discharge body are also provided with flanges for connection with external equipment.

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