Magnetic suspension liquid ring vacuum pump of magnetic driving device

Abstract

The invention belongs to the technical field of liquid ring vacuum pumps, in particular to a magnetic suspension liquid ring vacuum pump of a magnetic driving device, and provides the following scheme: the magnetic suspension liquid ring vacuum pump specifically comprises a front end cover, a rear end cover, a fixed pump body, an impeller and a pump shaft, a rear distributor is fixedly installed between the rear end cover and the fixed pump body, and the pump shaft is rotationally installed among the front end cover, the rear end cover and the fixed pump body. A magnetic induction structure formed by a copper conductor is arranged on the rotary pump body, and an inductor has no effect under the condition that no speed difference exists; under the condition that rotation of the impeller and the rotating pump body are not synchronous and the speed difference is generated, the rotating pump body cuts magnetic induction lines in the radial direction to sense the speed difference, the shell is driven to rotate through the magnetic coupling structure, and therefore the speed difference is eliminated, and the problems that friction is generated between liquid and the inner wall of the pump body, a large amount of energy loss is generated, and pump body abrasion is generated are solved.

Description

Technical Field

[0001] This invention relates to the field of liquid ring vacuum pump technology, and more particularly to a magnetically levitated liquid ring vacuum pump with a magnetic drive device. Background Technology

[0002] A liquid ring vacuum pump is a roughing pump that uses a liquid as its working medium. Those using water as the working medium are called water ring vacuum pumps; others can use oil, sulfuric acid, acetic acid, etc. During operation, the impeller drives the liquid to rotate, and the liquid rubs against the inner wall of the pump body, resulting in significant energy loss and pump wear.

[0003] Based on the above problems, Chinese invention patent application number 2025113420076 discloses a liquid ring vacuum pump with a rotatable pump body structure. During the operation of the liquid ring vacuum pump, the impeller drives the liquid to rotate, and the liquid will rub against the inner wall of the pump body, resulting in a large amount of energy loss and pump body wear. A magnetic levitation device is used to divide the pump into a shell, a rotatable pump body and an impeller. However, in actual experiments, the impeller rotates and drives the water to rotate, which in turn drives the rotatable pump body to rotate. This results in the problem of the impeller and the rotatable pump body rotating at different speeds. Further solutions are needed to address the problem of friction between the liquid and the inner wall of the pump body, which causes a large amount of energy loss and pump body wear.

[0004] In view of this, the present invention provides a magnetically driven magnetic levitation liquid ring vacuum pump to solve the technical problems existing in the prior art. Summary of the Invention

[0005] Based on the technical problems existing in the background technology, the present invention proposes a magnetic levitation liquid ring vacuum pump with magnetic drive device.

[0006] The present invention proposes a magnetic levitation liquid ring vacuum pump with a magnetic drive device, comprising a front cover, a rear cover, a fixed pump body, an impeller and a pump shaft. A front distributor is fixedly installed between the front cover and the fixed pump body, and a rear distributor is fixedly installed between the rear cover and the fixed pump body. The pump shaft is rotatably installed between the front cover, the rear cover and the fixed pump body, and the impeller is fixedly installed on the outer side of the pump shaft. Both the front and rear distributors have side sealing plates rotatably mounted on their inner sides, and a rotary pump body is fixedly mounted between the two side sealing plates. The rotary pump body is sleeved on the outside of the impeller. A magnetic levitation rotary assembly is fixedly mounted on the middle of the outer side of the rotary pump body, and a magnetic levitation permanent magnet assembly with an arc-shaped structure corresponding to the magnetic levitation rotary assembly is mounted at the middle of the top of the fixed pump body. The magnetic levitation permanent magnet assembly is used to provide radial magnetic levitation support force for the rotary pump body.

[0007] Preferably, in this invention, both ends of the impeller are provided with annular permanent magnet components, and the inner sides of the two side sealing plates are each equipped with a magnetic coupling component corresponding to the annular permanent magnet components.

[0008] Preferably, in this invention, the annular permanent magnet assembly comprises a magnet mounting ring disposed at both ends of the impeller, and a permanent magnet ring fixedly installed inside the magnet mounting ring, wherein the magnet mounting ring is made of a magnetically conductive material.

[0009] Preferably, in this invention, the magnetic coupling assembly is composed of a copper ring bushing embedded in the inner side of the side sealing plate and a magnetic ring fixedly installed on the surface of the copper ring bushing.

[0010] Preferably, in this invention, the gap between the two ends of the impeller and the side sealing plate is 1.25-3mm.

[0011] Preferably, in this invention, the two ends of the rotary pump body are fitted with annular copper conductors.

[0012] Preferably, in this invention, permanent magnets corresponding to the copper conductor are installed at both ends of the outer side of the impeller blades.

[0013] Preferably, in this invention, a shaft seal component is provided between the front end cover, the rear end cover, and the pump shaft.

[0014] Compared with the prior art, the present invention provides a magnetically driven magnetic levitation liquid ring vacuum pump, which has the following beneficial effects: Annular permanent magnet components are installed on both sides of the impeller, and magnetic coupling components are installed on the side sealing plate. The annular permanent magnet components and the magnetic coupling components form a magnetic coupling structure. The rotating pump body has a magnetic induction structure made of copper conductors. When there is no speed difference, the sensor has no effect. When the impeller rotates and the rotating pump body is not synchronized, that is, when a speed difference occurs, the rotating pump body cuts magnetic field lines in the radial direction to sense the speed difference. The magnetic coupling structure drives the shell to rotate, thereby eliminating the speed difference and solving the problem of friction between the liquid and the inner wall of the pump body, resulting in a large amount of energy loss and pump body wear. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a magnetically driven magnetic levitation liquid ring vacuum pump proposed in this invention; Figure 2 This is a BB cross-sectional view of a magnetically levitated liquid ring vacuum pump for a magnetic drive device proposed in this invention. Figure 3 This is a DD cross-sectional view of a magnetically levitated liquid ring vacuum pump with a magnetic drive device proposed in this invention. Figure 4This is an enlarged structural diagram of part A of a magnetically levitated liquid ring vacuum pump of a magnetic drive device proposed in this invention. Figure 5 This is a schematic diagram of the rotating pump body structure of a magnetically driven magnetic levitation liquid ring vacuum pump according to the present invention. Figure 6 This is a schematic diagram of the impeller structure of a magnetically driven, levitation liquid ring vacuum pump according to the present invention. Figure 7 This is a schematic diagram of the permanent magnet ring structure of a magnetically levitated liquid ring vacuum pump for a magnetic drive device proposed in this invention. Figure 8 This is a schematic diagram of the copper conductor structure of a magnetically levitated liquid ring vacuum pump for a magnetic drive device proposed in this invention; Figure 9 This is a schematic diagram of the magnetic coupling component structure of a magnetically driven magnetic levitation liquid ring vacuum pump according to the present invention. Figure 10 This is a schematic diagram of the magnetic levitation permanent magnet component structure of a magnetically driven liquid ring vacuum pump according to the present invention. Figure 11 This is a schematic diagram of the magnetic levitation rotating component structure of a magnetically driven magnetic levitation liquid ring vacuum pump proposed in this invention.

[0016] In the diagram: 1. Front distributor, 2. Front cover, 3. Pump shaft, 4. Side sealing plate, 41. Magnetic coupling assembly, 5. Magnetic levitation permanent magnet assembly, 6. Ring permanent magnet assembly, 61. Permanent magnet ring, 7. Rear cover, 8. Rear distributor, 9. Fixed pump body, 10. Impeller, 11. Rotary pump body, 12. Copper conductor, 13. Permanent magnet, 14. Magnetic levitation rotating assembly. Detailed Implementation

[0017] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0018] Reference Figures 1-11 A magnetically driven magnetic levitation liquid ring vacuum pump includes a front cover 2, a rear cover 7, a fixed pump body 9, an impeller 10, and a pump shaft 3. A front distributor 1 is fixedly installed between the front cover 2 and the fixed pump body 9, and a rear distributor 8 is fixedly installed between the rear cover 7 and the fixed pump body 9. The pump shaft 3 is rotatably installed between the front cover 2, the rear cover 7, and the fixed pump body 9, and the impeller 10 is fixedly installed on the outer side of the pump shaft 3. Shaft seal components are provided between the front cover 2, the rear cover 7, and the pump shaft 3. Both the front distributor 1 and the rear distributor 8 have side sealing plates 4 rotatably installed on their inner sides, and a rotary pump body 11 is fixedly installed between the two side sealing plates 4. The rotary pump body 11 is sleeved on the outside of the impeller 10. Reference Figure 4 , Figure 5 , Figure 8 and Figure 9 Both ends of the impeller 10 are provided with annular permanent magnet components 6, and the inner sides of the two side sealing plates 4 are each equipped with a magnetic coupling component 41 corresponding to the annular permanent magnet components. The magnetic coupling component 41 is composed of a copper ring bushing embedded in the inner side of the side sealing plate 4 and a magnetic guide ring fixedly installed on the surface of the copper ring bushing. The outer diameter of the copper ring bushing is 562mm, the inner diameter is 381mm, and the thickness of the copper ring bushing is 5mm. The thickness of the magnetic guide ring is greater than 6mm. The gap between the two ends of the impeller 10 and the side sealing plate 4 is 1.25-3mm.

[0019] Reference Figures 4-8 The annular permanent magnet assembly 6 comprises a magnet mounting ring disposed at both ends of the impeller 10, and a permanent magnet ring 61 fixedly installed inside the magnet mounting ring. The inner diameter of the mounting surface of the magnet mounting ring is 450 mm and the outer diameter is 500 mm. The mounting surface of the magnet mounting ring is 6 mm lower than the plane. The magnet mounting ring is made of a magnetically conductive material with a thickness greater than 4 mm. The outer diameter of the permanent magnet ring 61 is 500 mm and the inner diameter is 450 mm. The thickness of the permanent magnet ring 61 is 6 mm.

[0020] Annular permanent magnet assemblies 6 are installed on both sides of the impeller 10, and magnetic coupling assemblies 41 are installed on the side sealing plates 4. The annular permanent magnet assemblies 6 and the magnetic coupling assemblies 41 form a magnetic coupling structure. When the pump shaft 3 drives the impeller 10 to rotate, the impeller 10 drives the side sealing plates 4 to rotate through the annular permanent magnet assemblies 6 at both ends via permanent magnet transmission. The rotational speed of the side sealing plates 4 and the rotating pump body 11 is greater than 70% of the rotational speed of the impeller 10. The speed difference between the impeller 10 and the rotating pump body 11 is eliminated by the magnetic coupling. (Refer to...) Figure 2 , Figure 3 and Figure 8 , Figure 10 and Figure 11 A magnetic levitation rotating component 14 is fixedly installed on the outer middle part of the rotary pump body 11, and a magnetic levitation permanent magnet component 5 with an arc-shaped structure corresponding to the magnetic levitation rotating component 14 is installed at the top middle position of the fixed pump body 9. The magnetic levitation permanent magnet component 5 is used to provide radial magnetic levitation support force to the rotary pump body 11, and the magnetic levitation permanent magnet component 5 and the magnetic levitation rotating component 14 generate a levitation force of more than 3.5 tons.

[0021] Reference Figure 2 , Figure 3 and Figure 8 and Figure 11The rotary pump body 11 has annular copper conductors 12 embedded at both ends inside. The impeller 10 has permanent magnets 13 corresponding to the copper conductors 12 installed at both ends of the outer side of the blades. The number of permanent magnets 13 can be installed on each blade or one every other blade. The implementation is that the rotation of the pump shaft 3 will drive the permanent magnets 13 on the impeller 10 to rotate. The rotary pump body 11 has a magnetic induction structure composed of copper conductors 12. When there is no speed difference, the sensor has no effect. When the impeller 10 rotates and the rotary pump body 11 are not synchronized, that is, when a speed difference is generated, the rotary pump body 11 cuts magnetic field lines in the radial direction to sense the speed difference. The housing is driven to rotate through the magnetic coupling structure, thereby eliminating the speed difference and solving the problem of friction between the liquid and the inner wall of the pump body, resulting in a large amount of energy loss and pump body wear.

[0022] In use, annular permanent magnet components 6 are installed on both sides of the impeller 10, and magnetic coupling components 41 are installed on the side sealing plate 4. The annular permanent magnet components 6 and magnetic coupling components 41 form a magnetic coupling structure, and the rotary pump body 11 has a magnetic induction structure composed of copper conductors 12. When there is no speed difference, the sensor has no effect. When the impeller 10 rotates and the rotary pump body 11 rotates asynchronously, that is, when a speed difference is generated, the rotary pump body 11 cuts magnetic field lines in the radial direction to sense the speed difference. The magnetic coupling structure drives the housing to rotate, thereby eliminating the speed difference and solving the problem of friction between the liquid and the inner wall of the pump body, resulting in a large amount of energy loss and pump body wear.

[0023] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A magnetic levitation loop vacuum pump of magnetic force driving device, comprising a front end cover (2), a rear end cover (7), a fixed pump body (9), an impeller (10) and a pump shaft (3), a front distributor (1) is fixedly installed between the front end cover (2) and the fixed pump body (9), a rear distributor (8) is fixedly installed between the rear end cover (7) and the fixed pump body (9), the pump shaft (3) is rotatably installed between the front end cover (2), the rear end cover (7) and the fixed pump body (9), and the impeller (10) is fixedly installed at the outer side of the pump shaft (3), characterized in that: a side sealing plate (4) is rotatably installed at the inner side of the front distributor (1) and the rear distributor (8), a rotating pump body (11) is fixedly installed between the two side sealing plates (4), the rotating pump body (11) is sleeved at the outer side of the impeller (10), a magnetic levitation rotating assembly (14) is fixedly installed at the outer middle part of the rotating pump body (11), and a magnetic levitation permanent magnet assembly (5) with arc structure corresponding to the magnetic levitation rotating assembly (14) is installed at the top middle part of the fixed pump body (9), the magnetic levitation permanent magnet assembly (5) is used for providing radial magnetic levitation supporting force for the rotating pump body (11).

2. The magnetic levitation loop-seal vacuum pump of claim 1, wherein, Annular permanent magnet assemblies (6) are arranged at both ends of the impeller (10), and magnetic coupling assemblies (41) corresponding to the annular permanent magnet assemblies are installed at the inner sides of the two side sealing plates (4).

3. A magnetic levitation loop-seal vacuum pump of a magnetic drive device according to claim 2, characterized in that, The annular permanent magnet assembly (6) comprises a magnetic steel mounting ring arranged at both ends of the impeller (10) and a permanent magnet ring (61) fixedly installed inside the magnetic steel mounting ring, and the magnetic steel mounting ring is made of magnetic conductive material.

4. A magnetic levitation loop-seal vacuum pump of a magnetic drive device according to claim 3, characterized in that, The magnetic coupling assembly (41) is composed of a copper ring bushing embedded in the inner side of the side sealing plate (4) and a magnetic conductive ring fixedly installed on the surface of the copper ring bushing.

5. A magnetic levitation loop-seal vacuum pump of a magnetic drive device according to claim 4, characterized in that, The gap between the two ends of the impeller (10) and the side sealing plate (4) is 1.25-3mm.

6. The magnetic levitation loop-seal vacuum pump of claim 1, wherein, Annular copper conductors (12) are embedded at both ends of the interior of the rotating pump body (11).

7. A magnetic levitation loop-seal vacuum pump of a magnetic drive device according to claim 6, characterized in that Permanent magnets (13) corresponding to the copper conductors (12) are installed at both ends of the outer side of the blades of the impeller (10).

8. The magnetic levitation loop-seal vacuum pump of claim 1, wherein, Shaft sealing components are arranged between the front end cover (2), the rear end cover (7) and the pump shaft (3).

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