Stator connecting structure of single-screw pump

Abstract

A stator connecting structure of a single-screw pump comprises at least one group of stator sections, each stator section comprises a rubber lining and a metal outer cylinder wrapping the rubber lining, each group of stator sections comprises a first stator and a second stator, flange plates are arranged at the rear end of each first stator and the front end of each second stator in a sleeving mode, and the flange plates are connected with the rubber liners. The rear end of the first stator and the front end of the second stator are further provided with check blocks, the check blocks are located on the opposite sides of the two flange plates, the sides, from the outer diameter to the inner diameter, of the flange plates are further provided with locking holes, and the locking holes are used for locking the flange plates. The stator segments of different numbers are connected with one another to form stators of different lengths, so that different material conveying distance requirements can be met, universality is high, long stators do not need to be produced, machining difficulty is low, and storage is convenient.

Description

Technical Field

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

[0002] The single-screw pump is a rotor-type positive displacement pump that 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. Its main working parts are a stator with a double-headed spiral cavity and a rotor meshing with it in the stator cavity. The rotor rotates at a constant speed in the stator cavity to drive the axial movement of the material to achieve material transportation.

[0003] When conveying materials, the length of the stator and rotor will restrict the material conveying distance. Therefore, stators and rotors of different lengths are selected for material conveying according to the material conveying distance. The stator is made of one-piece rubber inside. If stators of different lengths need to be made, molds of different lengths need to be opened, which is costly. Some stators have a large diameter and a length of several meters, making it difficult to mold the inner lining rubber. Long stators are also not conducive to management and storage. Utility Model Content

[0004] 1. Technical Problems Solved

[0005] In view of the deficiencies of the prior art, the utility model provides a single screw pump stator connection structure, which is composed of stators of different lengths by connecting different numbers of stator segments to each other to meet different material conveying distance requirements.

[0006] 2. Specific technical solutions

[0007] A single screw pump stator connection structure comprises at least one group of stator segments, wherein the stator segments comprise a rubber lining and a metal outer cylinder wrapped around the rubber lining, each group of stator segments comprises a first stator and a second stator, the rear end of the first stator and the front end of the second stator are both sleeved with flanges, the rear end of the first stator and the front end of the second stator are also formed with a stopper, the stopper is located on one side opposite to the two flanges, and a locking hole is also opened on one side of the flange from its outer diameter to its inner diameter, and the locking hole is used for locking the flange.

[0008] Implementation principle and working principle:

[0009] 1. This solution adopts the method of selecting the corresponding number of stator segments for connection according to the material transportation distance requirements, which can meet the requirements of different material transportation distances and has a wider range of adaptability; at the same time, the shorter stator segments are easier to form during production;

[0010] 2. When making flange connection, you only need to rotate the flanges at the rear end of the first stator and the front end of the second stator to align the connection holes of the flanges on both sides and then connect the flanges on both sides with pins. Compared with the flange connection method fixed on the metal outer cylinder, the operation is simpler;

[0011] 3. When the flanges on both sides are connected, the design of the stopper can, on the one hand, prevent the flanges from axially sliding on the first stator and the second stator due to vibration, and on the other hand, it can withstand the larger tightening force during flange connection, and has better strength; the locking holes opened on the flanges can be used to lock the flanges on the metal outer cylinder through screw fasteners, etc., to prevent the flanges from circumferential sliding.

[0012] As a preferred embodiment, the flange is provided with a plurality of connecting holes at uniform circumferential intervals; there are a plurality of locking holes, and the locking holes are arranged between the connecting holes at radial intervals along the flange; the beneficial effect of this preferred embodiment is that the locking holes are spaced and arranged radially along the flange, which can avoid mutual influence between the connecting holes and the locking holes.

[0013] As a preferred embodiment, there are multiple blocks, which are evenly distributed around the rear end of the first stator and around the front end of the second stator. The beneficial effect of this preferred embodiment is that the axial tensile pressure generated when the flange is connected can be dispersed by setting multiple blocks, so that the force on the metal outer cylinder is more uniform.

[0014] As a preferred embodiment, a groove is further provided on one side of the flange plate connected to the metal outer cylinder, and the groove cooperates with the stopper, and the flange plate is sleeved on the rear end of the first stator or the front end of the second stator from the side where the stopper is located through the groove; the beneficial effect of this preferred embodiment is that when the first stator and the second stator are connected, the groove of the flange plate is first aligned with the stopper, and then the flange plate is installed into the metal outer cylinder, and the flange plate is rotated to make the groove and the stopper staggered to prevent the flange plate from slipping out, and through the cooperation of the groove and the stopper, the flange plate can be detachably connected to the stator segment, so that the stator segment and the flange plate can be kept separately, which is more convenient.

[0015] As a preference, the locking hole is a threaded hole, and a locking screw matching the locking hole is also provided on the outer side of the flange; the beneficial effect of this preference is that the locking screw abuts against the metal outer cylinder through the locking hole from the outer side of the flange to achieve circumferential locking of the flange, wherein the force applied to the stator segment is mainly axial tensile pressure, while the circumferential force is relatively small, and the flange can be well locked by the locking screw.

[0016] As a preference, the front end of the first stator or the rear end of the second stator is also sleeved with a second flange, and the second flange is welded or integrally formed on the front end of the first stator or the rear end of the second stator; the beneficial effect of this preference is: the second flange is set at the front end of the first stator or the rear end of the second stator by integral molding or welding, which has better consistency and better structural strength, is suitable for direct connection with the feed end and the discharge end of the single-screw pump, and has better sealing effect and stability at the connection.

[0017] As a preference, the rubber lining also includes a double-headed spiral cavity, and when the rear end of the first stator and the front end of the second stator are connected, the double-headed spiral cavity inside them matches; the beneficial effect of this preference is: when the stator segments are connected, since the interiors of both are double-headed spiral cavities, the connection is made according to the rotation direction during connection, which can effectively avoid obstruction to the material transportation of the rubber lining and ensure that its flow rate is not affected.

[0018] As a preferred embodiment, the metal outer cylinder at the rear end of the first stator shrinks inward to form a stepped first mounting section, and the metal outer cylinder at the front end of the second stator extends axially outward to form a second mounting section that cooperates with the first mounting section. The beneficial effect of this preferred embodiment is that through the cooperation between the first mounting section and the second mounting section, the connection between the stators can be made more stable, which is beneficial to improving the sealing of the stator segment connection and achieving a better leakage prevention effect.

[0019] The beneficial effects of the utility model are:

[0020] 1. Use multiple sets of shorter stator segments and connect them with flanges. The number of stator segments can be selected according to the material conveying distance. No longer stator is required, the production difficulty and cost are lower, and the shorter stator is easier to store. The flange is used as its connecting piece, and its air tightness and structural strength can be guaranteed.

[0021] 2. When the flanges between the stator segments are connected, the presence of the stopper can transfer the axial tension and pressure at the flange connection to the metal outer tube, thereby ensuring the stability and sealing of the connection; at the same time, the stopper and the groove of the flange can cooperate, that is, the flange can be removed from the metal outer tube through this structure, which is convenient for alignment when the stator segments are connected, and the separate structure is also easy to store.

[0022] 3. When the first stator and the second stator of the stator segment are connected by flanges, the presence of the stopper can effectively prevent the flange from moving radially on the metal outer cylinder; the extrusion effect of the flange and the stopper and the cooperation of the locking screw and the locking hole can effectively prevent the flange from moving circumferentially on the metal outer cylinder, and the connection stability is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a cross-sectional schematic diagram of the connection between the first stator and the second stator of the utility model.

[0024] Figure 2 It is a structural schematic diagram of the rear end of the first stator of the utility model.

[0025] Figure 3 It is a structural schematic diagram of the flange of the utility model.

[0026] Explanation of the accompanying drawings: rubber lining 1, double-headed spiral cavity 11, metal outer cylinder 2, first stator rear end 3, first mounting section 31, second stator front end 4, second mounting section 41, flange 5, locking hole 51, connecting hole 52, groove 53, locking screw 54, stopper 6, first stator front end 7, second stator rear end 8, second flange 9. DETAILED DESCRIPTION

[0027] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more explicit definition of the protection scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0028] like Figure 1 , Figure 2 and Figure 3 As shown:

[0029] A single screw pump stator connection structure includes at least one group of stator segments, wherein each group of stator segments includes a first stator and a second stator. Specifically, a rear end 3 of the first stator and a front end 4 of the second stator are connected. When implemented, the first stator and the second stator both have a rubber lining 1 and a metal outer cylinder 2 wrapped around the rubber lining.

[0030] During implementation, the first stator rear end 3 and the second stator front end 4 are realized by a flange 5 arranged on the metal outer tube 2; wherein a stopper 6 is arranged at the first stator rear end 3 and the second stator front end 4, wherein the stopper 6 is integrally formed on the metal outer tube 2, and specifically, when the flange 5 is connected, the stopper 6 is located at the opposite side of the two flanges 1;

[0031] During implementation, a groove 53 matching with the stopper 6 is further provided on the side where the flange 5 contacts the metal outer tube 6, wherein the number and size of the grooves 53 are similar to the number and size of the stopper 6. When the grooves 53 of the flange 5 are positioned opposite to the stopper 6, the flange 5 can be removed from the metal outer tube 2.

[0032] The implementation process and principles of the main plan are:

[0033] First, select the corresponding number of stator segments for connection according to the requirements of the material conveying distance, specifically, connect the rear end 3 of the first stator and the front end 4 of the second stator in the stator segment; when the first stator and the second stator are connected, first install the flange 5 into the corresponding stator, and when the flange 5 is assembled, align the groove 53 and the stopper 6 and install it into the metal outer cylinder 2, then rotate the flange 2 to prevent it from falling off, and then connect the flanges 5 on both sides together through pins or pull rods. Due to the extrusion between the stopper 6 and the flange 5, the flange 5 can be prevented from rotating or moving axially on the metal outer cylinder 2.

[0034] During implementation, the flange 5 at the rear end 3 of the first stator and the front end 4 of the second stator have multiple connecting holes 52 in their circumferential direction. When the two flanges 5 are connected, their connecting holes 52 should correspond one to one (be in the same straight line), and the optimal number of connecting holes 52 is 3-6; during implementation, in order to better prevent the flange 5 from circumferentially offset on the metal outer cylinder 5, a plurality of locking holes 51 are also provided in the radial direction of the flange 5, and the optimal installation position of the locking hole 51 is between adjacent connecting holes 52, so that the locking hole 51 and the connecting hole 52 will not conflict with each other and can play their respective roles; during specific implementation, the locking hole 51 is a threaded hole, and a locking screw 54 is provided in the circumferential direction of the flange 5. After the locking screw 54 cooperates with the locking hole 51, it directly abuts against the block 6 or the metal outer cylinder 2, which can further prevent the flange 5 from circumferential rotation.

[0035] During implementation, in order to make the force on the metal outer tube 2 more uniform, the number of the stoppers 6 is 3-6, which are evenly distributed at the rear end 3 of the first stator and the front end 4 of the second stator. The advantage of this is that this number of stoppers 6 is enough to make the force on the metal outer tube 2 more reasonable, so that the life of the connection is longer and the sealing effect of the connection is better;

[0036] During implementation, since the rubber lining 1 has a double-headed spiral cavity 11, when connecting, the rotation direction of the double-headed spiral cavity 11 inside the first stator and the second stator needs to be consistent and the interface needs to match. In the scheme, the block 6 can also play a positioning role. When connecting, the position relationship of the block 6 of the first stator or the second stator can be observed to determine whether their rotation directions are consistent, which can reduce the impact on the material flow in the cavity.

[0037] During implementation, in order to make the connection between the first stator rear end 3 and the second stator front end 4 more stable and leak-proof, the metal outer tube 2 of the first stator rear end 3 contracts inward to form a stepped first mounting section 31, and the metal outer tube 2 of the second stator front end 4 extends axially to form a second mounting section 41 that cooperates with the first mounting section 31. Through this cooperation, the sealing effect is better, and it is also convenient to add a sealing gasket at the connection to further ensure the sealing of the connection.

[0038] During implementation, the connection between the stator segment and the feed end and the discharge end of the single-screw pump must also be considered. In this solution, the front end 7 of the first stator can be welded to the second flange 9, or the second flange 9 can be integrally formed at the front end 7 of the first stator. The advantage of this is that the consistency between the metal outer cylinder 2 and the second flange 9 is better, and the structural strength of the connection is better; similarly, the second flange 9 is also set at the rear end 8 of the second stator by welding or integral molding.

[0039] Working principle and beneficial effects:

[0040] 1. When using this solution to transport materials, different groups of stator segments can be selected for connection according to different conveying distances, rather than using long stators for transportation; shorter stators are easier to produce and easier to store;

[0041] 2. When the stator segments are specifically connected, the rear end 3 of the first stator is connected to the front end 4 of the second stator through the flange 5. The connection through the flange 5 can effectively ensure the sealing between the stators and facilitate disassembly and maintenance;

[0042] 3. When the rear end 3 of the first stator and the front end 4 of the second stator pass through the flange, the presence of the stopper 6 can prevent the flange 5 from circumferential or axial slippage on the first stator and the second stator, and the connection stability is better; at the same time, the cooperation between the groove 53 set on the flange and the stopper 6 facilitates the disassembly of the flange, and is more convenient for disassembly and storage; through the cooperation of the locking hole 51 and the locking screw 54, it can be further ensured that the flange rotates circumferentially on the metal outer cylinder.

[0043] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention shall be defined by the appended claims.

Claims

1. A single screw pump stator connection structure, comprising at least one group of stator segments, wherein the stator segments comprise a rubber liner (1) and a metal outer cylinder (2) wrapped around the rubber liner (1), each group of stator segments comprises a first stator and a second stator, and is characterized in that: The first stator rear end (3) and the second stator front end (4) are both sleeved with flanges (5), and the first stator rear end (3) and the second stator front end (4) are both formed with stoppers (6), and the stoppers (6) are located on the opposite sides of the two flanges (5). The flanges (5) are also provided with locking holes (51) on one side from the outer diameter to the inner diameter thereof, and the locking holes (51) are used for locking the flanges (5).

2. The single screw pump stator connection structure according to claim 1, characterized in that: The flange (5) is provided with a plurality of connection holes (52) at even intervals in the circumferential direction; and the locking holes (51) are provided in a plurality and are arranged between the connection holes (52) at intervals along the radial direction of the flange (5).

3. The single screw pump stator connection structure according to claim 1, characterized in that: There are a plurality of stoppers (6) which are evenly distributed around a circle around the rear end (3) of the first stator and a circle around the front end (4) of the second stator.

4. The single screw pump stator connection structure according to claim 1, characterized in that: A groove (53) is also provided on the side where the flange (5) is connected to the metal outer tube (2), and the groove (53) matches the stopper (6). The flange (5) is sleeved on the rear end (3) of the first stator or the front end (4) of the second stator from the side where the stopper (6) is located through the groove (53).

5. The single screw pump stator connection structure according to claim 1, characterized in that: The locking hole (51) is a threaded hole, and a locking screw (54) matching the locking hole (51) is also arranged on the outer side of the flange (5).

6. The single screw pump stator connection structure according to claim 1, characterized in that: The first stator front end (7) or the second stator rear end (8) is also sleeved with a second flange (9), and the second flange (9) is welded or integrally formed on the first stator front end (7) or the second stator rear end (8).

7. The single screw pump stator connection structure according to claim 1, characterized in that: The rubber lining (1) further comprises a double-headed spiral cavity (11), and when the rear end (3) of the first stator and the front end (4) of the second stator are connected, the double-headed spiral cavity (11) inside them matches.

8. The single screw pump stator connection structure according to claim 1, characterized in that; The metal outer cylinder (2) at the rear end (3) of the first stator is contracted inwardly to form a stepped first mounting section (31), and the metal outer cylinder (2) at the front end (4) of the second stator is axially extended outwardly to form a second mounting section (41) that matches the first mounting section (31).

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