Flexible rod eccentric locking structure

Abstract

The utility model discloses a flexible rod eccentric locking structure, which belongs to the technical field of screw pump production and comprises a flexible rod, two ends of the flexible rod are respectively provided with a connecting shaft and a rotor, one end of the connecting shaft and one end of the rotor close to the flexible rod are respectively provided with a counterbore, the counterbore comprises a port and an eccentric hole, and the port is provided with a through hole. The connecting shaft is provided with a port, the port is communicated with the eccentric hole, the port is located at one end, close to the flexible rod, of the connecting shaft and the rotor, the counterbore is provided with an eccentric sleeve, the eccentric sleeve is provided with a transverse threaded hole, and the connecting shaft and the rotor are provided with screws matched with the transverse threaded hole. The end, away from the eccentric hole, of the eccentric sleeve is connected with the flexible rod, the axis of the flexible rod coincides with the axis of the connecting shaft after assembly is completed, loosening can be avoided, the flexible rod can be conveniently and independently detached and replaced, and the maintenance cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of screw pump production, and particularly relates to a flexible rod eccentric locking structure. Background Art

[0002] The flexible rod is usually used as a connecting component between the transmission shaft and the spiral rotor in the screw pump. The characteristics of the flexible rod screw pump mainly include: no traditional joints, no moving or wearing parts, and no need to lubricate each joint, etc.

[0003] The connection methods between the flexible rod and the transmission shaft and the rotor are usually threaded connection or hot sleeve expansion connection. In actual use, there are certain defects in these two connection methods:

[0004] 1. When using threaded connection, the joint is prone to looseness due to the rotation of the transmission shaft and the rotor.

[0005] 2. The stress at the threaded connection between the flexible rod and the rotor and the rotating shaft is concentrated, and fatigue fracture is likely to occur.

[0006] 3. Due to the thread helix direction, the threaded connection structure cannot be reversed.

[0007] 4. When using hot sleeve expansion connection, although the above-mentioned drawbacks will not occur, as long as one of the three parts has a problem during operation, it cannot be repaired and can only be replaced entirely, and the repair cost of the equipment is very expensive.

[0008] In view of the problems existing in the above-mentioned prior art, the utility model designs and manufactures a flexible rod eccentric locking structure to overcome the above defects. Summary of the Utility Model

[0009] Regarding the problems existing in the prior art, a flexible rod eccentric locking structure provided by the utility model can avoid loosening, facilitate the separate disassembly and replacement of the flexible rod, and reduce the maintenance cost.

[0010] In order to achieve the above object, the technical solution adopted by the utility model is as follows: a flexible rod eccentric locking structure includes a flexible rod, and a connecting shaft and a rotor are respectively installed at both ends of the flexible rod;

[0011] A counterbore is provided at one end of the connecting shaft and the rotor close to the flexible rod. The counterbore includes a port and an eccentric hole, the port and the eccentric hole are communicated with each other, and the port is located at one end of the connecting shaft and the rotor close to the flexible rod;

[0012] An eccentric sleeve is installed on the counterbore, a transverse threaded hole is provided on the eccentric sleeve, a screw matching with the transverse threaded hole is installed on the connecting shaft and the rotor, one end of the eccentric sleeve far from the eccentric hole is connected with the flexible rod, and the axis of the flexible rod coincides with the axis of the connecting shaft after assembly.

[0013] Preferably, the diameter of the port is larger than the diameter of the eccentric hole, the axis of the port coincides with the axis of the flexible rod, and the eccentric hole is internally tangent to the port.

[0014] Preferably, one end of the eccentric sleeve far from the eccentric hole is provided with a fixing hole coinciding with the axis of the connecting shaft, and the two fixing holes are respectively matched with the two ends of the flexible rod.

[0015] Preferably, the eccentric sleeve is a hot-fitted eccentric sleeve, and the fixing hole and the flexible rod are in a hot-fitted connection.

[0016] Preferably, the two eccentric sleeves are centrosymmetric about the center of the flexible rod.

[0017] Preferably, one end of the eccentric sleeve far from the eccentric hole extends out from the port and wraps around the end of the flexible rod.

[0018] Preferably, the eccentric sleeve and the counterbore are in a clearance fit.

[0019] Preferably, the screw is an internal hexagonal tip set screw.

[0020] The beneficial effects of the present utility model are as follows:

[0021] 1. In the present utility model, a counterbore is provided on the connecting shaft and the rotor, and two eccentric sleeves are installed at both ends of the flexible connecting rod to cooperate with the counterbore to achieve connection. Most of the torque received during rotation is borne by the eccentric sleeves, greatly reducing the situation of fatigue fracture at both ends of the flexible connecting rod and prolonging the service life of the flexible rod.

[0022] 2 2. One end of the eccentric sleeve inserted into the eccentric hole does not coincide with the axes of the connecting shaft, the flexible rod, etc. The eccentric sleeve is fixed by screws, which can play a limiting role when the screw pump rotates, and the situation of loosening can be avoided during both forward and reverse rotations, and it is convenient to disassemble and replace, reducing the maintenance cost.

[0023] 3. In the present utility model, the eccentric sleeve and the flexible rod are connected together by a hot-fitting process, which can not only ensure firm assembly but also reduce the material consumption of the flexible rod and save the material machining cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a cross-sectional view of a flexible rod eccentric locking structure of the present utility model;

[0025] Figure 2 This is a partial enlarged view of an eccentric sleeve of a flexible rod eccentric locking structure of the utility model.

[0026] In the figure: 1-connecting shaft, 2-screw, 3-eccentric sleeve, 4-flexible rod, 5-fixing hole, 6-transverse threaded hole, 7-rotor, 8-eccentric hole, 9-port, 10-countersunk hole. Specific implementation method

[0027] In order to facilitate the understanding of those skilled in the art, the utility model is further described below in conjunction with the accompanying drawings.

[0028] If Figure 1-2 A flexible rod eccentric locking structure shown includes a flexible rod 4, a connecting shaft 1 and a rotor 7 are respectively installed at both ends of the flexible rod 4, and the flexible rod 4 serves as a connecting piece to connect the connecting shaft 1 and the rotor 7 together;

[0029] The utility model is provided with a countersunk hole 10 at one end of the connecting shaft 1 and the rotor 7 close to the flexible rod 4, the countersunk hole 10 includes a port 9 and an eccentric hole 8, the port 9 and the eccentric hole 8 are connected to each other, the port 9 is located at the end of the connecting shaft 1 and the rotor 7 close to the flexible rod 4, the diameter of the port 9 is larger than the diameter of the eccentric hole 8, and the eccentric hole 8 and the port 9 are inscribed;

[0030] The utility model has an eccentric sleeve 3 installed on the countersunk hole 10. The eccentric sleeve 3 is a profiling part of the countersunk hole 10. The part of the eccentric sleeve 3 inserted into the eccentric hole 8 can limit the position when the screw pump rotates, avoiding the eccentric sleeve 3 and the countersunk hole 10 from slipping and losing the transmission effect. The eccentric hole 8 and the port 9 are cut inward, which facilitates the eccentric sleeve 3 to be inserted into the countersunk hole 10. At the same time, the diameter of the eccentric sleeve 3 inserted into the eccentric hole 8 is guaranteed. The size is slightly smaller than the port 9 as much as possible, so as to better withstand the force when the screw pump rotates.

[0031] Specifically, the end of the eccentric sleeve 3 away from the eccentric hole 8 is connected to the flexible rod 4, and the end of the eccentric sleeve 3 away from the eccentric hole 8 extends from the port 9 and wraps around the end of the flexible rod 4. The eccentric sleeve 3 serves as a protective sleeve for the flexible rod 4 to wrap its two ends. When the screw pump rotates, the force at the connection is shared by the two eccentric sleeves 3 and the flexible rod 4, which can better protect the flexible rod 4, avoid fatigue fracture at the end of the flexible rod 4, and extend the service life of the flexible rod 4.

[0032] Specifically, the end of the eccentric sleeve 3 away from the eccentric hole 8 is provided with a fixing hole 5 which coincides with the axis of the connecting shaft 1. After assembly, the axis of the flexible rod 4 coincides with the axis of the connecting shaft 1. The coincidence of the axes of the connecting shaft 1, the fixing hole 5 and the connecting shaft 1 can ensure the stability of the transmission, reduce the shaking generated during the rotation of the screw pump, and extend the service life of the flexible rod 4.

[0033] The two fixing holes 5 of the present utility model are respectively matched with the two ends of the flexible rod 4. The axis of the port 9 coincides with the axis of the flexible rod 4, and the axis of the fixing hole 5 coincides with the axis of the port 9, which can ensure the uniformity of the wall thickness at the connection end of the eccentric sleeve 3 and the flexible rod 4, and avoid the occurrence of easy damage at the weak part due to uneven thickness.

[0034] Specifically, the eccentric sleeve 3 is a hot-fitted eccentric sleeve 3. Before assembly, the eccentric sleeve 3 is heated to make its inner diameter expand and become larger due to heat. At this time, the end of the flexible rod 4 is inserted into the fixing hole 5. After cooling, the aperture of the fixing hole 5 shrinks, and the fixing hole 5 and the flexible rod 4 achieve hot-fitting, and the two are tightly connected together to achieve fixation, which can not only ensure firm assembly but also reduce the material consumption of the flexible rod 4 and save the material machining cost.

[0035] The clearance fit between the eccentric sleeve 3 and the counterbore 10 of the present utility model is convenient for assembly. The eccentric sleeve 3 is provided with a transverse threaded hole 6, and screws 2 matched with the transverse threaded hole 6 are installed on the connecting shaft 1 and the rotor 7. Due to the eccentric structure design of the eccentric sleeve 3, the part inserted into the eccentric hole 8 bears the largest torque, and the screw 2 is only used for limiting the movement of the eccentric sleeve 3 along the length direction of the connecting shaft 1 to prevent the connecting sleeve from coming out of the counterbore 10. Therefore, this fixing method has strong reliability and can ensure the connection strength.

[0036] Specifically, using the screw 2 to fix the eccentric sleeve 3 can play a limiting role when the screw pump rotates, and can avoid loosening during both forward and reverse rotations, and is convenient for disassembly and replacement, reducing the maintenance cost.

[0037] The screw 2 of the present utility model is an internal hexagonal tip set screw 2. The design without a nut enables the screw 2 to be completely inserted into the connecting shaft 1 or the rotor 7 without any protruding part interfering with the rotation of the rotor 7 or the connecting shaft 1.

[0038] Specifically, the two eccentric sleeves 3 are centrosymmetric about the center of the flexible rod 4. Since the connecting shaft 1, the flexible rod 4, and the rotor 7 rotate synchronously during transmission, when the eccentric sleeves 3 at both ends of the flexible rod 4 are transmitting power, two opposite and equal-sized acting forces will be generated. These two acting forces can make the eccentric sleeve 3 tightly abut against the side wall of the counterbore 10, avoiding the shaking of the eccentric sleeve 3 during rotation, and increasing the reliability and stability of the connection.

[0039] It should be understood that the use of these embodiments is only for explaining the present utility model and is not intended to limit the protection scope of the present utility model. In addition, it should also be understood that after reading the technical content of the present utility model, those skilled in the art can make various changes, modifications, and / or variations to the present utility model, and all these equivalent forms also fall within the protection scope defined by the appended claims of this application.

Claims

1. A flexible rod eccentric locking structure, characterized in that: It comprises a flexible rod (4), with a connecting shaft (1) and a rotor (7) respectively mounted on both ends of the flexible rod (4); A countersunk hole (10) is provided at one end of the connecting shaft (1) and the rotor (7) close to the flexible rod (4); the countersunk hole (10) comprises a port (9) and an eccentric hole (8); the port (9) and the eccentric hole (8) are connected to each other; the port (9) is located at one end of the connecting shaft (1) and the rotor (7) close to the flexible rod (4); An eccentric sleeve (3) is installed on the countersunk hole (10), and a transverse threaded hole (6) is provided on the eccentric sleeve (3). Screws (2) matching the transverse threaded hole (6) are installed on the connecting shaft (1) and the rotor (7). The end of the eccentric sleeve (3) away from the eccentric hole (8) is connected to the flexible rod (4). After assembly, the axis of the flexible rod (4) coincides with the axis of the connecting shaft (1).

2. The flexible rod eccentric locking structure according to claim 1, characterized in that: The diameter of the port (9) is greater than the diameter of the eccentric hole (8), the axis of the port (9) coincides with the axis of the flexible rod (4), and the eccentric hole (8) and the port (9) are inscribed.

3. The flexible rod eccentric locking structure according to claim 1, characterized in that: One end of the eccentric sleeve (3) away from the eccentric hole (8) is provided with a fixing hole (5) that coincides with the axis of the connecting shaft (1), and the two fixing holes (5) are respectively matched with the two ends of the flexible rod (4).

4. The flexible rod eccentric locking structure according to claim 3, characterized in that: The eccentric sleeve (3) is a shrink-fit eccentric sleeve (3), and the fixing hole (5) and the flexible rod (4) are shrink-fitted.

5. The flexible rod eccentric locking structure according to claim 1, characterized in that: The two eccentric sleeves (3) are symmetrical along the center of the flexible rod (4).

6. The flexible rod eccentric locking structure according to claim 1, characterized in that: One end of the eccentric sleeve (3) away from the eccentric hole (8) extends out from the port (9) and wraps around the end of the flexible rod (4).

7. The flexible rod eccentric locking structure according to claim 1, characterized in that: The eccentric sleeve (3) and the countersunk hole (10) are clearance-matched.

8. The flexible rod eccentric locking structure according to claim 1, characterized in that: The screw (2) is a hexagon socket set screw.

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