Compact type double-bearing leakproof double-screw pump

Abstract

The invention discloses a compact double-support leakproof double-screw pump, which relates to the technical field of double-screw pumps, and comprises a pump body, a transition plate and a motor, and further comprises an inlet part, an outlet part and a sealing part which are arranged on the pump body, a conveying assembly and a bearing assembly which are arranged in the pump body, and a transmission part arranged on the conveying assembly. The outer magnet assembly and the inner magnet assembly are arranged in the driving screw, a backflow hole is designed, the axial installation space is greatly reduced while the magnetic sealing work environment is guaranteed, the compact design can be applied to the field with the limited installation space, and the practicability of the device is improved to a certain degree; a magnetic sealing mode is adopted, dynamic sealing of the shaft seal is converted into static sealing, the maintenance cost is low, the pump body only has three static seals including the pump body and the first end cover, the pump body and the second end cover and the first end cover and the isolation sleeve, the risk of leakage of the shaft seal and the mechanical seal is eliminated, and leakage is completely avoided.

Description

Technical Field

[0001] The invention relates to the technical field of twin-screw pumps, and in particular to a compact double-supported anti-leakage twin-screw pump. Background Art

[0002] With the continuous development of industrial technology and application fields, the requirements for fluid conveying equipment are also increasing. Especially in the petrochemical, food processing and pharmaceutical industries, twin-screw pumps are widely used due to their high efficiency, low pulsation and good self-priming performance. However, there are some shortcomings in the design of existing twin-screw pumps, such as: Large space occupation: Traditional twin-screw pumps are often large in structure and occupy a large amount of installation space, which limits their application in space-limited environments, such as ships, mobile equipment or small chemical plants. In addition, the large size also increases transportation costs and the complexity of on-site installation.

[0003] Leakage risk of shaft seal and mechanical seal: Shaft seal and mechanical seal are key components to ensure no leakage during pumping. However, the performance of traditional twin-screw pumps in this regard is not ideal, especially after long-term operation, the seals are prone to wear and aging, resulting in frequent leakage problems, which not only affects the continuity and safety of production, but also increases maintenance costs and the risk of environmental pollution, so it is urgently needed to improve. Summary of the invention

[0004] In view of the deficiencies in the prior art, the object of the present invention is to provide a compact double-supported anti-leakage twin-screw pump, aiming to solve the above-mentioned technical problems.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A compact double-support anti-leakage twin-screw pump comprises a pump body, a transition plate and a motor, wherein the motor is arranged on a surface of the transition plate away from the pump body, and the motor is detachably fixedly connected to the transition plate. The compact double-support anti-leakage twin-screw pump further comprises: An inlet portion is provided on the pump body, and is used to provide a channel for external media to enter the pump body; An outlet portion is arranged on the pump body, and the outlet portion is used to provide a channel for the medium in the pump body to be output from the pump body; A sealing part, arranged on the pump body, and used for sealing the pump body to prevent leakage of the medium in the pump body; A conveying assembly is disposed in the pump body, and is used to convey the medium input into the pump body to the outlet; A bearing assembly is disposed in the pump body, and the bearing assembly is used to provide support for the conveying assembly; The transmission part is arranged on the conveying assembly, and is used to transmit the kinetic energy of the motor to the telescopic assembly.

[0006] Preferably, the inlet portion comprises: An inlet pipe is arranged on the pump body, the inlet pipe is communicated with the interior of the pump body, and the inlet pipe is fixedly connected to the pump body; The inlet flange is arranged at one end of the inlet pipe away from the pump body, and the inlet flange is fixedly connected to the inlet pipe.

[0007] Preferably, the sealing portion comprises: A first end cover is disposed at one end of the pump body close to the transition plate, and the first end cover is detachably fixedly connected to the pump body, and the first end cover is detachably fixedly connected to the transition plate; A first internal groove is formed on a surface of the first end cover facing the interior of the pump body; A second internal groove is formed on a surface of the first end cover facing the interior of the pump body; A second end cover is disposed at an end of the pump body away from the transition plate, and the second end cover is detachably fixedly connected to the pump body; a third internal groove, formed on a surface of the second end cover facing the interior of the pump body; The fourth built-in groove is formed on the surface of the second end cover facing the interior of the pump body.

[0008] Preferably, the bearing assembly comprises: A first bearing, located in the first built-in groove and detachably fixedly connected to the first end cover; A second bearing is located in the second built-in groove and is detachably fixedly connected to the first end cover; A third bearing is located in the third built-in groove and is detachably fixedly connected to the second end cover; The fourth bearing is located in the fourth built-in groove and is detachably fixedly connected to the second end cover.

[0009] Preferably, the conveying assembly comprises: A driving screw is disposed in the pump body, and one end of the driving screw close to the first bearing is rotatably connected to the first bearing, and one end of the driving screw close to the third bearing is rotatably connected to the third bearing, and the axis of the driving screw coincides with the axis of the output end of the motor; The driven screw is arranged in the pump body, and one end of the driven screw close to the second bearing is rotatably connected to the second bearing, and one end of the driven screw close to the fourth bearing is rotatably connected to the fourth bearing, and the driven screw is meshed with the driving screw.

[0010] Preferably, a driving groove is provided at one end of the driving screw away from the third bearing, and a reflux hole is provided in the driving screw.

[0011] Preferably, the transmission part comprises: An external magnet assembly is disposed in the driving slot, and the external magnet assembly is detachably fixedly connected to the driving screw; An isolation sleeve is arranged on the surface of the first end cover close to the transition plate, the isolation sleeve is detachably fixedly connected to the first end cover, one end of the isolation sleeve away from the transition plate extends into the driving groove, and a gap is left between the outer surface of the isolation sleeve and the outer magnet assembly; A coupling is arranged on the output end of the motor and is detachably fixedly connected to the output end of the motor, and one end of the coupling away from the motor extends into the isolation sleeve; The inner magnet assembly is arranged on the outer surface of the coupling and is detachably fixedly connected to the coupling. The inner magnet assembly is located in the isolation sleeve, and a gap is left between the inner magnet assembly and the inner surface of the isolation sleeve.

[0012] Preferably, the magnets in the outer magnet assembly are arranged in a driving groove of the driving screw with N poles and S poles alternating, and the magnets in the inner magnet assembly are arranged in a staggered manner on the outside of the coupling with S poles and N poles alternating, and the N poles of the magnets in the outer magnet assembly correspond one-to-one to the S poles of the magnets in the inner magnet assembly.

[0013] Preferably, the outlet portion comprises: An outlet pipe is arranged on the pump body, the outlet pipe is communicated with the interior of the pump body, and the outlet pipe is fixedly connected to the pump body; The outlet flange is arranged at one end of the outlet pipe away from the pump body, and the outlet flange is fixedly connected to the outlet pipe.

[0014] Preferably, the pump body is provided with three chambers, namely an inlet chamber connected to the inlet pipe, an outlet chamber connected to the outlet pipe, and a sealed chamber formed by the outer surface of the isolation sleeve and the surface of the driving groove.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: The present invention arranges the outer magnet assembly and the inner magnet assembly inside the driving screw and designs the return hole to ensure the working environment of the magnetic seal, while greatly reducing the axial installation space. The compact design can be suitable for sites with limited installation space, which improves the practicality of the device to a certain extent. The present invention converts the dynamic seal of the shaft seal into a static seal by adopting the form of magnetic seal, and the maintenance cost is low. The pump body has only three static seals, including the pump body and the first end cover, the pump body and the second end cover, and the first end cover and the isolation sleeve, which eliminates the risk of leakage of the shaft seal and the mechanical seal and achieves complete leakage-free. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0017] Figure 1 A partial cross-sectional front view of a compact double-bearing anti-leakage twin-screw pump is shown.

[0018] Figure 2 A side view of a compact double-bearing, leak-proof twin-screw pump is shown.

[0019] Figure 3 A top view of a compact double-bearing, leak-proof twin-screw pump is shown.

[0020] Figure 4 A cross-sectional view showing the pump body and internal structure.

[0021] Figure 5 Shows Figure 4 A schematic diagram of the enlarged local structure at point A in the middle.

[0022] Figure 6 A distribution diagram of the outer magnet assembly and the inner magnet assembly is shown.

[0023] Legend: 1. Pump body; 2. Transition plate; 3. Motor; 4. Inlet pipe; 5. Inlet flange; 6. First end cover; 7. First built-in groove; 8. Second built-in groove; 9. Second end cover; 10. Third built-in groove; 11. Fourth built-in groove; 12. First bearing; 13. Second bearing; 14. Third bearing; 15. Fourth bearing; 16. Drive screw; 17. Drive groove; 18. Reflux hole; 19. Driven screw; 20. External magnet assembly; 21. Spacer sleeve; 22. Coupling; 23. Internal magnet assembly; 24. Outlet pipe; 25. Outlet flange; 26. Inlet chamber; 27. Outlet chamber; 28. Sealed chamber. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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 creative work are within the scope of protection of the present invention.

[0025] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0026] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0028] Reference Figures 1 to 6 A compact double-support anti-leakage twin-screw pump embodiment of the present invention is further described.

[0029] A compact double-support anti-leakage twin-screw pump comprises a pump body 1, a transition plate 2 and a motor 3, wherein the motor 3 is arranged on the surface of the transition plate 2 away from the pump body 1, and the motor 3 is detachably fixedly connected to the transition plate 2. Three chambers are arranged in the pump body 1, namely an inlet chamber 26 connected to the inlet pipe 4, an outlet chamber 27 connected to the outlet pipe 24, and a sealed chamber 28 formed by the outer surface of the isolation sleeve 21 and the surface of the driving groove 17. The compact double-support anti-leakage twin-screw pump also comprises: The inlet part is arranged on the pump body 1, and is used to provide a channel for the external medium to enter the pump body 1, and the inlet part includes: An inlet pipe 4 is arranged on the pump body 1, the inlet pipe 4 is communicated with the interior of the pump body 1, and the inlet pipe 4 is fixedly connected to the pump body 1; The inlet flange 5 is arranged at one end of the inlet pipe 4 away from the pump body 1 , and the inlet flange 5 is fixedly connected to the inlet pipe 4 .

[0030] Reference Figures 1 to 6 , a sealing part is arranged on the pump body 1, and the sealing part is used to seal the pump body 1 to prevent leakage of the medium in the pump body 1, and the sealing part includes: A first end cover 6 is disposed at one end of the pump body 1 close to the transition plate 2, and the first end cover 6 is detachably fixedly connected to the pump body 1, and the first end cover 6 is detachably fixedly connected to the transition plate 2; A first internal groove 7 is provided on a surface of the first end cover 6 facing the interior of the pump body 1; A second internal groove 8 is provided on the surface of the first end cover 6 facing the inside of the pump body 1; A second end cover 9 is disposed at an end of the pump body 1 away from the transition plate 2, and the second end cover 9 is detachably fixedly connected to the pump body 1; A third internal groove 10 is provided on the surface of the second end cover 9 facing the inside of the pump body 1; The fourth built-in groove 11 is formed on the surface of the second end cover 9 facing the interior of the pump body 1 .

[0031] Reference Figures 1 to 6 , a bearing assembly is arranged in the pump body 1, and the bearing assembly is used to provide support for the conveying assembly, and the bearing assembly includes: A first bearing 12, located in the first built-in groove 7, and detachably fixedly connected to the first end cover 6; A second bearing 13 is located in the second built-in groove 8 and is detachably fixedly connected to the first end cover 6; A third bearing 14 is located in the third built-in groove 10 and is detachably fixedly connected to the second end cover 9; The fourth bearing 15 is located in the fourth built-in groove 11 and is detachably fixedly connected to the second end cover 9 .

[0032] It should be noted that the first bearing 12 and the third bearing 14 are provided to axially position and radially support the driving screw 16 in the conveying assembly, and the second bearing 13 and the fourth bearing 15 are provided to axially position and radially support the driven screw 19 in the conveying assembly. At the same time, the device uses bearings at both ends of the driving screw 16 and the driven screw 19 for support, so that the driving screw 16 and the driven screw 19 have higher rigidity, thereby enabling them to better bear loads and resist deformation, and have advantages such as stable structure and low failure rate. Reference Figures 1 to 6 , a conveying assembly is arranged in the pump body 1, and the conveying assembly is used to convey the medium input into the pump body 1 to the outlet portion, and the conveying assembly includes: A driving screw 16 is disposed in the pump body 1, and one end of the driving screw 16 close to the first bearing 12 is rotatably connected to the first bearing 12, and one end of the driving screw 16 close to the third bearing 14 is rotatably connected to the third bearing 14, the axis of the driving screw 16 coincides with the axis of the output end of the motor 3, and a driving groove 17 is provided at one end of the driving screw 16 away from the third bearing 14, and a reflux hole 18 is provided in the driving screw 16; It should be noted that, by designing a loop formed by the reflux hole 18 in the driving screw 16, the conveying medium can take away a large amount of heat generated by magnetic field induction, thereby ensuring a sealed working environment and preventing sealing failure.

[0033] The driven screw 19 is disposed in the pump body 1, and one end of the driven screw 19 close to the second bearing 13 is rotatably connected to the second bearing 13, and one end of the driven screw 19 close to the fourth bearing 15 is rotatably connected to the fourth bearing 15, and the driven screw 19 and the driving screw 16 are meshed with each other.

[0034] Reference Figures 1 to 6 , a transmission part is arranged on the conveying assembly, and the transmission part is used to transfer the kinetic energy of the motor 3 to the telescopic assembly, and the transmission part includes: An external magnet assembly 20 is disposed in the driving slot 17, and the external magnet assembly 20 is detachably fixedly connected to the driving screw 16; An isolation sleeve 21 is arranged on the surface of the first end cover 6 close to the transition plate 2, the isolation sleeve 21 is detachably fixedly connected to the first end cover 6, one end of the isolation sleeve 21 away from the transition plate 2 extends into the driving groove 17, and a gap is left between the outer surface of the isolation sleeve 21 and the outer magnet assembly 20; It should be noted that by providing an isolation sleeve 21, the medium can be isolated from the outside of the pump body 1 to achieve leakage-free operation. The isolation sleeve 21 is made of non-ferromagnetic material and has high resistivity, is not affected by the magnetic field, can effectively reduce eddy current losses, and ensure long-term stable operation.

[0035] A coupling 22 is disposed on the output end of the motor 3 and is detachably fixedly connected to the output end of the motor 3. One end of the coupling 22 away from the motor 3 extends into the isolation sleeve 21. The inner magnet assembly 23 is disposed on the outer surface of the coupling 22 and is detachably fixedly connected to the coupling 22 . The inner magnet assembly 23 is located in the isolation sleeve 21 , and a gap is left between the inner magnet assembly 23 and the inner surface of the isolation sleeve 21 .

[0036] The present invention arranges the outer magnet assembly 20 and the inner magnet assembly 23 inside the driving screw 16 and designs the return hole 18 to ensure the working environment of the magnetic seal while greatly reducing the axial installation space. The compact design can be suitable for sites with limited installation space, thereby improving the practicality of the device to a certain extent.

[0037] The present invention converts the dynamic seal of the shaft seal into a static seal by adopting a magnetic seal, which has low maintenance cost. The pump body 1 has only three static seals, including the pump body 1 and the first end cover 6, the pump body 1 and the second end cover 9, and the first end cover 6 and the isolation sleeve 21, thereby eliminating the risk of leakage of the shaft seal and the mechanical seal, and achieving complete leakage-free.

[0038] Reference Figures 1 to 6 The magnets in the outer magnet assembly 20 are arranged alternately with N poles and S poles in the driving groove 17 of the driving screw 16, and the magnets in the inner magnet assembly 23 are arranged alternately with S poles and N poles on the outside of the coupling 22, and the N poles of the magnets in the outer magnet assembly 20 correspond one by one to the S poles of the magnets in the inner magnet assembly 23.

[0039] It should be noted that the present invention arranges the magnets in the outer magnet assembly 20 and the inner magnet assembly 23 in a staggered manner, so that the magnetic field formed by the inner and outer N poles and S poles of the magnets in the outer magnet assembly 20 and the inner magnet assembly 23 ensures that the inner and outer rotation speeds are consistent.

[0040] The outlet part is arranged on the pump body 1, and is used to provide a channel for the medium in the pump body 1 to be output from the pump body 1. The outlet part includes: An outlet pipe 24 is disposed on the pump body 1, the outlet pipe 24 is communicated with the interior of the pump body 1, and the outlet pipe 24 is fixedly connected to the pump body 1; The outlet flange 25 is disposed at one end of the outlet pipe 24 away from the pump body 1 , and the outlet flange 25 is fixedly connected to the outlet pipe 24 .

[0041] Working principle: Refer to Figures 1 to 6When working, the medium is transported to the inlet chamber 26 of the pump body 1 through the inlet flange 5 and the inlet pipe 4, and the motor 3 is started, so that the coupling 22 fixedly connected to the output end of the motor 3 rotates, and then the magnet in the inner magnet assembly 23 arranged on the coupling 22 rotates around the axis of the coupling 22. Through magnetic field induction, the magnet in the outer magnet assembly 20 corresponding to the magnet in the inner magnet assembly 23 also rotates synchronously around the axis of the coupling 22, thereby driving the driving screw 16 to rotate. Through the engagement between the driving screw 16 and the driven screw 19, the pressure in the outlet chamber 27 gradually increases, so that the pressure in the outlet chamber 27 is greater than that in the inlet chamber 26, and then most of the medium in the inlet chamber 26 is transported to the outlet chamber 27. The medium entering the outlet chamber 27 is finally discharged from the pump body 1 through the outlet pipe 24, and the remaining very small part of the medium will enter the sealed chamber 28 through the first bearing 12, and re-enter the inlet chamber 26 through the driving groove 17 in the driving screw 16 and the third bearing 14.

[0042] The above description of the embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A compact double-support anti-leakage twin-screw pump, comprising a pump body (1), a transition plate (2) and a motor (3), wherein the motor (3) is arranged on a surface of the transition plate (2) away from the pump body (1), and the motor (3) is detachably fixedly connected to the transition plate (2), characterized in that: The compact double-bearing, leak-proof twin-screw pump also includes: An inlet portion, arranged on the pump body (1), the inlet portion being used to provide a channel for external medium to be input into the pump body (1); An outlet portion, arranged on the pump body (1), the outlet portion being used to provide a channel for the medium in the pump body (1) to be output from the pump body (1); A sealing portion, arranged on the pump body (1), the sealing portion being used to seal the pump body (1) to prevent leakage of a medium in the pump body (1); A conveying assembly is arranged in the pump body (1), and is used to convey the medium input into the pump body (1) to the outlet; A bearing assembly, arranged in the pump body (1), the bearing assembly being used to provide support for the conveying assembly; A transmission part is arranged on the conveying assembly, and is used to transmit the kinetic energy of the motor (3) to the telescopic assembly.

2. A compact double-supported anti-leakage twin-screw pump according to claim 1, characterized in that: The inlet portion comprises: an inlet pipe (4) disposed on the pump body (1), the inlet pipe (4) being in communication with the interior of the pump body (1), and the inlet pipe (4) being fixedly connected to the pump body (1); An inlet flange (5) is arranged at an end of the inlet pipe (4) away from the pump body (1), and the inlet flange (5) is fixedly connected to the inlet pipe (4).

3. A compact double-supported anti-leakage twin-screw pump according to claim 2, characterized in that: The sealing portion comprises: A first end cover (6) is arranged at one end of the pump body (1) close to the transition plate (2), and the first end cover (6) is detachably fixedly connected to the pump body (1), and the first end cover (6) is detachably fixedly connected to the transition plate (2); A first built-in groove (7) is formed on a surface of the first end cover (6) facing the interior of the pump body (1); A second built-in groove (8) is formed on a surface of the first end cover (6) facing the interior of the pump body (1); A second end cover (9) is arranged at an end of the pump body (1) away from the transition plate (2), and the second end cover (9) is detachably fixedly connected to the pump body (1); a third internal groove (10) formed on a surface of the second end cover (9) facing the interior of the pump body (1); The fourth built-in groove (11) is formed on a surface of the second end cover (9) facing the interior of the pump body (1).

4. A compact double-supported anti-leakage twin-screw pump according to claim 3, characterized in that: The bearing assembly comprises: A first bearing (12) is located in the first built-in groove (7) and is detachably fixedly connected to the first end cover (6); A second bearing (13) is located in the second built-in groove (8) and is detachably fixedly connected to the first end cover (6); A third bearing (14) is located in the third built-in groove (10) and is detachably fixedly connected to the second end cover (9); The fourth bearing (15) is located in the fourth built-in groove (11) and is detachably fixedly connected to the second end cover (9).

5. A compact double-supported anti-leakage twin-screw pump according to claim 4, characterized in that: The conveying assembly comprises: A driving screw (16) is disposed in the pump body (1), and one end of the driving screw (16) close to the first bearing (12) is rotatably connected to the first bearing (12), and one end of the driving screw (16) close to the third bearing (14) is rotatably connected to the third bearing (14), and the axis of the driving screw (16) coincides with the axis of the output end of the motor (3); A driven screw rod (19) is disposed in the pump body (1), and one end of the driven screw rod (19) close to the second bearing (13) is rotatably connected to the second bearing (13), and one end of the driven screw rod (19) close to the fourth bearing (15) is rotatably connected to the fourth bearing (15), and the driven screw rod (19) and the driving screw rod (16) are meshed with each other.

6. A compact double-supported anti-leakage twin-screw pump according to claim 5, characterized in that: A driving groove (17) is provided at one end of the driving screw rod (16) away from the third bearing (14), and a return hole (18) is provided in the driving screw rod (16).

7. A compact double-supported anti-leakage twin-screw pump according to claim 6, characterized in that: The transmission part comprises: An external magnet assembly (20) is disposed in the driving groove (17), and the external magnet assembly (20) is detachably fixedly connected to the driving screw rod (16); an isolation sleeve (21) disposed on a surface of the first end cover (6) close to the transition plate (2), the isolation sleeve (21) being detachably fixedly connected to the first end cover (6), an end of the isolation sleeve (21) away from the transition plate (2) extending into the driving groove (17), and a gap being left between the outer surface of the isolation sleeve (21) and the outer magnet assembly (20); A coupling (22) is arranged on the output end of the motor (3) and is detachably fixedly connected to the output end of the motor (3), and one end of the coupling (22) away from the motor (3) extends into the isolation sleeve (21); An inner magnet assembly (23) is arranged on the outer surface of the coupling (22) and is detachably fixedly connected to the coupling (22); the inner magnet assembly (23) is located inside the isolation sleeve (21), and a gap is left between the inner magnet assembly (23) and the inner surface of the isolation sleeve (21).

8. A compact double-supported anti-leakage twin-screw pump according to claim 7, characterized in that: The magnets in the outer magnet assembly (20) are arranged in a driving groove (17) of the driving screw (16) with N poles and S poles alternately arranged, and the magnets in the inner magnet assembly (23) are arranged on the outside of the coupling (22) with S poles and N poles alternately arranged, and the N poles of the magnets in the outer magnet assembly (20) correspond one to one with the S poles of the magnets in the inner magnet assembly (23).

9. A compact double-supported anti-leakage twin-screw pump according to claim 8, characterized in that: The export department includes: an outlet pipe (24) disposed on the pump body (1), the outlet pipe (24) being in communication with the interior of the pump body (1), and the outlet pipe (24) being fixedly connected to the pump body (1); An outlet flange (25) is arranged at an end of the outlet pipe (24) away from the pump body (1), and the outlet flange (25) is fixedly connected to the outlet pipe (24).

10. A compact double-supported anti-leakage twin-screw pump according to claim 9, characterized in that: The pump body (1) is provided with three chambers, namely an inlet chamber (26) connected to the inlet pipe (4), an outlet chamber (27) connected to the outlet pipe (24), and a sealed chamber (28) formed by the outer surface of the isolation sleeve (21) and the surface of the driving groove (17).

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