Combined screw pump stator

Abstract

The utility model provides a combined screw pump stator, which relates to the technical field of screw pumps, and comprises at least N combined stators, the combined stators are cylindrical components, spiral stator cavities are arranged in the combined stators along the length direction of the combined stators, the adjacent stator cavities are on the same spiral line track, and the N is a positive integer greater than or equal to 1. A positioning hole matched with the combined stator is formed in the connecting piece, an annular limiting ring is coaxially arranged in the middle of the positioning hole, flange plates are arranged at the two ends of the screw pump stator respectively, and pull rods are detachably connected between the connecting piece and the flange plates. The screw pump stator has the advantages that reprocessing is not needed, only existing parts need to be used for installation and extension, the processing difficulty and cost of screw pumps with different lengths are reduced, and the manufacturing of the screw pump stators with different lengths and models is simpler and more convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of screw pumps, in particular to a combined screw pump stator. Background Art

[0002] The single screw pump is a rotor type positive displacement pump, which relies on the meshing of the screw and the bushing to produce volume changes in the suction chamber and the discharge chamber to transport liquid. It is an internally meshed closed screw pump, and the main working parts are composed of a bushing (stator) with a double-headed spiral cavity and a single-headed spiral screw (rotor) meshed with it in the stator cavity. When the input shaft drives the rotor to make planetary rotation around the center of the stator through the universal joint, the stator-rotor pair continuously meshes to form a sealed cavity, and these sealed cavities move axially at a uniform speed without changing the volume, transporting the conveying medium from the suction end to the discharge end through the stator-rotor pair, and the medium sucked into the closed cavity flows through the stator without being stirred or damaged.

[0003] In the existing related technologies, since the stator length of the screw pump is closely related to its own transmission efficiency and pressure, the manufacture of screw pumps with different transmission efficiencies and pumping pressures requires the re-manufacturing of stators of different lengths, which makes stator processing more difficult. Utility Model Content

[0004] In view of the deficiencies in the prior art, the present invention provides a combined screw pump stator, which solves the problem of inconvenience in manufacturing screw pump stators of different lengths.

[0005] According to an embodiment of the utility model, a combined screw pump stator includes at least N (N≥2) combined stators, the combined stator is a cylindrical component, a spiral stator cavity is arranged inside the combined stator along its own length direction, adjacent stator cavities are on the same spiral trajectory, connecting pieces are detachably connected between adjacent combined stators, a positioning hole adapted to the combined stator is arranged on the connecting piece, an annular limit ring is coaxially arranged in the middle of the positioning hole, N combined stators and connecting pieces form a screw pump stator, flanges are respectively arranged at both ends of the screw pump stator, a pull rod for applying a force along the axial direction of the combined stator is detachably connected between the connecting piece and the flange; a discharging mechanism is arranged at one end of the screw pump stator, and a connecting pipe with a ball coupling is installed at the other end thereof.

[0006] Through the above technical scheme, when a longer screw pump stator needs to be manufactured, a suitable number of modular stators are connected in series to form a whole by using several connectors, flanges, and tie rods to form a screw pump stator of suitable length. The screw pump stator does not need to be reprocessed, but only needs to be extended using parts, thereby reducing the processing difficulty and cost of screw pumps of different lengths, making the manufacture of screw pump stators of different length models simpler and more convenient.

[0007] Preferably, both ends of the combined stator are formed with stepped cylindrical surfaces, and the diameter of the stepped cylindrical surface is smaller than the outer diameter of the combined stator.

[0008] Through the above technical solution, when two adjacent combined stators are installed on the connecting piece, the stepped cylindrical surface provided on the combined stators can be used to conveniently position the combined stators, thereby improving the coaxiality between adjacent combined stators and preventing the rotor from being stuck in the stator cavity.

[0009] Preferably, an elastic stator core is formed inside the combined stator, the stator cavity is arranged in the stator core, and an extension ring is formed on the stator core at the end of the combined stator.

[0010] Through the above technical solution, the elastic extension ring provided on the end of the stator core and integrally formed can be pressed into contact with the limit ring, thereby improving the sealing of the stator cavity and the reliability of the device.

[0011] Preferably, positioning rings are formed on both sides of the connecting member, and the positioning rings are used to position adjacent combined stators to improve coaxiality, and the positioning rings are annular components.

[0012] Through the above technical solution, by using the positioning rings arranged on both sides of the connecting piece, the freedom of the combined stator installed on the connecting piece can be limited, preventing the combined stator installed thereon from moving with the connecting piece as the center, further improving the coaxiality between adjacent combined stators and improving the reliability of the device.

[0013] Preferably, the pull rod is a cylindrical component with a thread at one end, and a clamping surface for tool clamping is formed at one end of the pull rod close to the thread.

[0014] Through the above technical scheme, when the pull rod is tightened by the nut and a force is applied to the combined stator and the connecting piece, the clamping surface of the pull rod is clamped by a tool and the nut is rotated. This can reduce the displacement of the pull rod due to elastic deformation along its own axis, making it more convenient to apply a tightening force to the pull rod, making the device easier and quicker to manufacture.

[0015] Preferably, the connecting piece is provided with a through hole for the pull rod to pass through, and the diameter of the through hole is larger than the diameter of the pull rod.

[0016] Through the above technical solution, by utilizing a structure in which the diameter of the through hole is larger than the diameter of the pull rod, the coaxiality between the combined stators can have an error within the allowable range, and there is a certain displacement space when adjusting the coaxiality of the combined stator, making the installation of the device more convenient.

[0017] Preferably, a supporting foot is provided at the bottom of the connecting member, and a reinforcing rib is formed between the supporting foot and the positioning ring.

[0018] Through the above technical solution, when the screw pump stator is made longer, the connection of the adjacent combined stators can be supported by the support feet and reinforcing ribs provided on the connecting piece to prevent the possibility of deformation at the connection and reducing the air tightness inside.

[0019] Compared with the prior art, the present invention has at least one of the following beneficial effects:

[0020] 1. When a screw pump stator with a longer length needs to be manufactured, a suitable number of modular stators are connected in series to form a whole by using several connectors, flanges, and tie rods to form a screw pump stator of suitable length. The screw pump stator does not need to be reprocessed, but only needs to be extended using parts, which reduces the processing difficulty and cost of screw pumps of different lengths, making the manufacture of screw pump stators of different lengths simpler and more convenient;

[0021] 2. The elastic extension ring formed integrally with the end of the stator core can be extruded and contacted with the limit ring, thereby improving the sealing of the stator cavity and the reliability of the device;

[0022] 3. When using nuts to tighten the tie rod and applying force to the combined stator and connector, using a tool to clamp the clamping surface of the tie rod and then turning the nut can reduce the displacement of the tie rod along its own axis due to elastic deformation, making it more convenient to apply tightening force to the tie rod, making the device easier and quicker to manufacture. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the overall structure of this application;

[0024] Figure 2 for Figure 1 Schematic diagram of the half-section structure;

[0025] Figure 3 for Figure 2 A magnified view of part A;

[0026] Figure 4 is a structural schematic diagram of a connecting piece;

[0027] Figure 5 for Figure 1 Enlarged view of part B.

[0028] In the above drawings:

[0029] 1. Combined stator; 11. Stator cavity; 12. Stepped cylindrical surface; 13. Stator core; 14. Extension ring;

[0030] 2. Connector; 21. Positioning hole; 22. Limiting ring; 23. Positioning ring; 24. Perforation; 25. Support foot; 26. Reinforcement rib;

[0031] 3. Screw pump stator;

[0032] 4. Flange;

[0033] 5. Tie rod; 51. Clamping surface;

[0034] 6. Discharging mechanism;

[0035] 7. Connecting pipe. DETAILED DESCRIPTION

[0036] The technical solution of the present utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0037] A combined screw pump stator, referring to Figure 1-Figure 5 , including at least N (N≥2) combined stators 1, the combined stator 1 is a cylindrical component, a spiral stator cavity 11 is arranged inside the combined stator 1 along its own length direction, adjacent stator cavities 11 are on the same spiral trajectory, and stepped cylindrical surfaces 12 are formed at both ends of the combined stator 1. The diameter of the stepped cylindrical surface 12 is smaller than the outer diameter of the combined stator 1. The stepped cylindrical surface 12 can be used to facilitate the positioning of the combined stator 1.

[0038] An elastic stator core 13 is formed inside the assembled stator 1. The stator core 13 can be made of rubber with a certain elasticity. The stator cavity 11 is arranged in the stator core 13. The length direction of the stator cavity 11 is consistent with the length direction of the stator core 13. The stator core 13 is formed with an extension ring 14 at the end of the assembled stator 1. The outer diameter of the extension ring 14 is the same as the outer diameter of the stepped cylindrical surface 12.

[0039] A connector 2 is detachably connected between adjacent modular stators 1, and a positioning hole 21 adapted to the modular stator 1 is provided on the connector 2. The positioning hole 21 is used to install the stepped cylindrical surface 12 of the modular stator 1, and an annular limit ring 22 is coaxially provided in the middle of the positioning hole 21. N modular stators 1 and the connector 2 form a screw pump stator 3. Flanges 4 are respectively provided at both ends of the screw pump stator 3. Protrusions for positioning and sealing the ends of the modular stators 1 are formed on the flange 4 as needed. A pull rod 5 for applying a force along the axial direction of the modular stator 1 is detachably connected between the connector 2 and the flange 4. The pull rod 5 is fixed to the flange 4 by nuts and / or welding. When a plurality of modular stators 1 are connected to form an integral screw pump stator 3 by using the pull rod 5, the extension ring 14 provided on the stator core 13 can improve the sealing between adjacent modular stators 1, thereby improving the reliability of the device.

[0040] As needed, a discharging mechanism 6 is provided at one end of the screw pump stator 3 . The discharging mechanism 6 is a prior art and can be purchased on the market or customized in a factory. A connecting pipe 7 with a ball coupling is installed at the other end of the screw pump stator 3 .

[0041] Positioning rings 23 are formed on both sides of the connector 2. The positioning rings 23 are used to position adjacent modular stators 1 to improve coaxiality. The positioning rings 23 are annular components, and the length of the positioning rings 23 is made as required. By using the positioning rings 23 arranged on both sides of the connector 2, the degree of freedom of the modular stator 1 installed on the connector 2 can be limited, and the modular stator 1 installed thereon can be prevented from moving with the connector 2 as the center of the circle, thereby further improving the coaxiality between adjacent modular stators 1 and improving the reliability of the device.

[0042] The pull rod 5 is a cylindrical member with a thread at one end, and a clamping surface 51 for tool clamping is formed at one end of the pull rod 5 near the thread. When the pull rod 5 is tightened with a nut and a force is applied to the combined stator 1 and the connector 2, the clamping surface 51 of the pull rod 5 is clamped with a tool, and then the nut is turned, which can reduce the displacement of the pull rod 5 due to elastic deformation along its own axis, making it more convenient to apply a tightening force to the pull rod 5, making the device easier and faster to manufacture.

[0043] The connecting member 2 is provided with a through hole 24 for the pull rod 5 to pass through. The diameter of the through hole 24 is larger than the diameter of the pull rod 5 to facilitate the passing of the pull rod 5 and the adjustment of the device.

[0044] In order to reduce the possibility of deformation of the screw pump stator 3 at the connecting member 2 due to its own weight, a support foot 25 is provided at the bottom of the connecting member 2 , and a reinforcing rib 26 is formed between the support foot 25 and the positioning ring 23 .

[0045] The implementation principle of a combined screw pump stator in this application is:

[0046] When it is necessary to make a screw pump stator 3 of a longer length, a plurality of connectors 2, flanges 4, and tie rods 5 are used to arrange the modular stators 1 to be used in a straight line, the connectors 2 are installed between adjacent modular stators 1, flanges 4 are installed at the ends of the modular stators 1 at both ends that are away from each other, the tie rod 5 is fixed on one of the flanges 4 and passed through the connector 2, a tool is used to clamp the clamping surface 51 at the other end of the tie rod 5, and a nut is tightened on the tie rod 5 using a tool, so that a suitable number of modular stators 1 can be connected in series to form a screw pump stator 3 of a suitable length, and a discharge mechanism 6 and a connecting pipe 7 can be installed as needed; the screw pump stator 3 does not need to be reprocessed, and only needs to be extended using existing parts, which reduces the processing difficulty and cost of screw pumps of different lengths, making the manufacture of screw pump stators 3 of different models simpler and more convenient.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A combined screw pump stator, characterized in that: The invention comprises at least N combined stators (1), N≥2, the combined stators (1) being cylindrical components, a spiral stator cavity (11) being arranged inside the combined stators (1) along its length direction, adjacent stator cavities (11) being on the same spiral track, connecting pieces (2) being detachably connected between adjacent combined stators (1), a positioning hole (21) being arranged on the connecting piece (2) and being adapted to the combined stators (1), and a coaxial positioning hole (21) being arranged in the middle of the positioning hole (21). An annular limiting ring (22) is provided, and N combined stators (1) and connecting pieces (2) form a screw pump stator (3); flanges (4) are provided at both ends of the screw pump stator (3); a pull rod (5) for applying an axial force to the combined stator (1) is detachably connected between the connecting piece (2) and the flange (4); a discharge mechanism (6) is provided at one end of the screw pump stator (3), and a connecting pipe (7) for passing a ball coupling is installed at the other end.

2. A combined screw pump stator according to claim 1, characterized in that: Both ends of the combined stator (1) are formed with stepped cylindrical surfaces (12), and the diameter of the stepped cylindrical surface (12) is smaller than the outer diameter of the combined stator (1).

3. The combined screw pump stator according to claim 1, characterized in that: An elastic stator core (13) is formed inside the combined stator (1), a stator cavity (11) is arranged inside the stator core (13), and an extension ring (14) is formed on the end of the combined stator (1).

4. The combined screw pump stator according to claim 1, characterized in that: Positioning rings (23) are formed on both sides of the connecting piece (2). The positioning rings (23) are used to position adjacent combined stators (1) to improve coaxiality. The positioning rings (23) are annular components.

5. The combined screw pump stator according to claim 1, characterized in that: The pull rod (5) is a cylindrical component with a thread at one end, and a clamping surface (51) for clamping a tool is formed at the end of the pull rod (5) close to the thread.

6. A combined screw pump stator according to claim 5, characterized in that: The connecting piece (2) is provided with a through hole (24) for the pull rod (5) to pass through, and the diameter of the through hole (24) is larger than the diameter of the pull rod (5).

7. A combined screw pump stator according to claim 4, characterized in that: A supporting foot (25) is provided at the bottom of the connecting member (2), and a reinforcing rib (26) is formed between the supporting foot (25) and the positioning ring (23).

Images