Anti-loosening structure for set screw of transmission ring

Abstract

The invention discloses a transmission ring set screw anti-loose structure which comprises a transmission ring, a pre-tightening force compensation system and a set screw, and the transmission ring is provided with an axial threaded hole; the pre-tightening force compensation system comprises an energy storage cavity formed in the outer side end of the axial threaded hole, an elastic energy storage piece contained in the energy storage cavity and a limiting ring covering an opening of the energy storage cavity. The pre-tightening force compensation system is provided with an operation channel for a tool to penetrate through. A set screw is arranged in the axial threaded hole in a penetrating manner, and the head of the set screw is limited by the limiting ring; and the set screw compresses the elastic energy storage piece in a locking state, so that the elastic energy storage piece continuously applies axial restoring force for resisting loosening of the screw. The sealing structure is reliable in structure, extra pre-tightening force is applied to the set screw through the installed elastic element, the friction force between the set screw and the surface of the shaft sleeve is increased, the set screw is effectively prevented from loosening and slipping, and the performance of the sealing structure is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical seals, and in particular to a transmission ring set screw anti-loosening structure. Background Art

[0002] When the pressure of the cartridge mechanical seal is below 3MPa, the transmission device usually adopts a transmission ring, and its typical structure is as follows: Figure 1 As shown, during the high-speed start-up and operation of the rotating equipment, the transmission ring relies on the static friction force generated by tightening the set screw to simultaneously transmit torque and axial force, drive the sleeve and dynamic ring assembly to rotate, and prevent the sleeve from slipping in the axial direction. The current structure of the transmission ring is relatively simple, and during operation it mainly relies on pre-tightening force to prevent loosening. The screws are affected by vibration and centrifugal force, and may become loose and slip, affecting performance. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention provides a transmission ring set screw anti-loosening structure.

[0004] The present invention solves the above-mentioned technical problem with the following technical solution: a transmission ring set screw anti-loosening structure, comprising: A transmission ring having an axial threaded hole; The preload force compensation system comprises an energy storage cavity provided at the outer end of the axial threaded hole, an elastic energy storage member accommodated in the energy storage cavity, and a limiting ring covering the opening of the energy storage cavity, which is provided with an operating channel for a tool to pass through; a set screw, which is inserted into the axial threaded hole and has its head restricted by the limiting ring; Wherein, the set screw compresses the elastic energy storage component in a locked state, so that the elastic energy storage component continuously applies an axial restoring force to resist the screw from loosening.

[0005] Furthermore, the elastic energy storage component is a compressible elastic body, whose maximum outer contour dimension in a free state is smaller than the inner diameter of the energy storage cavity, and its minimum inner contour dimension is larger than the aperture of the operating channel.

[0006] Furthermore, the limiting ring is an annular cover plate fixed to the transmission ring, and the aperture of the operating channel is smaller than the maximum circumscribed dimension of the head of the set screw.

[0007] Furthermore, the limiting ring is fixed to the outer surface of the transmission ring by interference fit or welding.

[0008] Furthermore, the fixing screw is installed from the inner diameter side to the outer diameter side of the transmission ring.

[0009] Furthermore, the energy storage cavity is a countersunk structure, and its depth is greater than the free height of the elastic energy storage component.

[0010] Furthermore, the elastic energy storage member includes a plurality of coaxial elastic elements stacked together. Furthermore, the screw head of the set screw is embedded in the mounting hole of the limiting ring, and the end surface of the screw head is flush with or concave to the outer surface of the limiting ring.

[0011] The present invention has the following beneficial effects: the transmission ring set screw anti-loosening structure provided by the present invention has a reliable structure, and an additional pre-tightening force is applied to the set screw by the installed elastic element, thereby increasing the friction between the set screw and the surface of the sleeve, effectively preventing the set screw from loosening and slipping, and effectively improving the performance of the sealing structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 Schematic diagram of the transmission ring structure in the present invention; Figure 3 Schematic diagram of reverse screwing of the set screw in the present invention; Figure 4 This is a schematic diagram of the transmission ring assembly completed in the present invention; Figures 1 to 4 The reference numerals shown in the figure represent respectively: 1-transmission ring, 12-energy storage cavity, 2-elastic energy storage member, 3-limiting ring, 4-fastening screw. DETAILED DESCRIPTION

[0013] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0014] A transmission ring set screw anti-loosening structure, comprising a transmission ring 1, a preload compensation system and a set screw, wherein the transmission ring 1 is provided with an axial threaded hole; The preload compensation system comprises an energy storage chamber 12 located at the outer end of the axial threaded hole, an elastic energy storage element 2 housed within the chamber, and a retaining ring 3 covering the opening of the chamber. The retaining ring 3 includes an operating channel for tools to pass through, the aperture of which is smaller than the maximum circumscribed dimension of the set screw head. The retaining ring 3 is secured to the outer surface of the transmission ring 1 by an interference fit or welding. The elastic energy storage element dynamically compensates for the preload (to counteract vibration), while the retaining ring physically intercepts screw displacement (to counteract centrifugal force).

[0015] In this embodiment, the energy storage cavity 12 is a countersunk structure, the depth of which is greater than the free height of the elastic energy storage component 2, and is used to provide a physical accommodation space for the elastic energy storage component, isolate the threaded hole from the external environment, prevent the elastomer from falling off, and control the initial compression of the elastomer by controlling the cavity depth.

[0016] The elastic energy storage element 2 is a compressible elastomer. Its maximum outer dimension in its free state is smaller than the inner diameter of the energy storage cavity 12, ensuring that the elastomer fits freely into the cavity, avoiding assembly interference and allowing for thermal expansion and vibration deformation. Its minimum inner dimension is larger than the aperture of the operating channel, preventing the elastomer from accidentally dislodging from the operating channel and ensuring that an Allen wrench can penetrate the center of the elastomer to tighten the screw. The elastic energy storage element 2 comprises multiple coaxial elastic elements stacked together. These elements can be wave springs, which convert mechanical vibration into elastic potential energy. This automatically compensates for preload loss when the screw loosens due to vibration.

[0017] The limiting ring serves as an elastomer restraint. Specifically, the limiting ring 3 is an annular cover fixed to the transmission ring 1, specifically a full-coverage annular structure, which is used to restrain the elastomers in all energy storage cavities 12 to avoid the risk of assembly dislocation caused by the split cover.

[0018] In this embodiment, the set screw 4 is inserted into the axial threaded hole, and its head is restrained by the retaining ring 3. Specifically, the head of the set screw 4 is embedded in the mounting hole of the retaining ring, and the end face of the screw head is flush with or concave with the outer surface of the retaining ring. The set screw 4 is installed from the inner diameter side to the outer diameter side of the transmission ring. When locked, the set screw 4 compresses the elastic energy storage element 2, causing it to continuously exert an axial restoring force to resist loosening of the screw.

[0019] When assembling this structure, first assemble the transmission ring on the mechanical seal sleeve, then screw the set screw in the opposite direction from the inner diameter of the sleeve to the outer diameter, tighten the wave spring, and compress the wave spring to a state where the set screw does not interfere with the pump shaft. Then install the mechanical seal as a whole on the pump shaft, tighten the set screw to fix it on the pump shaft for transmission, while the wave spring is still in a compressed state, which can provide additional pre-tightening force and effectively prevent the set screw from loosening.

[0020] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A transmission ring set screw anti-loosening structure, characterized in that: include: A transmission ring (1) is provided with an axial threaded hole; A preload compensation system comprises an energy storage cavity (12) provided at the outer end of the axial threaded hole, an elastic energy storage member (2) accommodated in the energy storage cavity (12), and a limiting ring (3) covering the opening of the energy storage cavity (12), and is provided with an operating channel for a tool to pass through; A set screw (4) is inserted into the axial threaded hole and its head is limited by the limiting ring (3); The set screw (4) compresses the elastic energy storage component (2) in a locked state, so that the elastic energy storage component (2) continuously applies an axial restoring force that resists the screw from loosening.

2. The transmission ring set screw anti-loosening structure according to claim 1, characterized in that: The elastic energy storage member (2) is a compressible elastic body, and its maximum outer contour dimension in a free state is smaller than the inner diameter of the energy storage cavity (12), and its minimum inner contour dimension is larger than the aperture of the operating channel.

3. The transmission ring set screw anti-loosening structure according to claim 1, characterized in that: The limiting ring (3) is an annular cover plate fixed to the transmission ring (1), and the aperture of the operating channel is smaller than the maximum external dimension of the head of the set screw (4).

4. The transmission ring set screw anti-loosening structure according to claim 3, characterized in that: The limiting ring (3) is fixed to the outer surface of the transmission ring (1) by interference fit or welding.

5. The transmission ring set screw anti-loosening structure according to claim 1, characterized in that: The installation direction of the set screw (4) is to screw it in from the inner diameter side to the outer diameter side of the transmission ring (1).

6. The transmission ring set screw anti-loosening structure according to claim 1, characterized in that: The energy storage cavity (12) is a countersunk structure, and its depth is greater than the free height of the elastic energy storage component (2).

7. The transmission ring set screw anti-loosening structure according to claim 2, characterized in that: The elastic energy storage member (2) comprises a plurality of coaxial elastic elements that are stacked and arranged.

8. The transmission ring set screw anti-loosening structure according to claim 5, characterized in that: The screw head of the set screw (4) is embedded in the mounting hole of the limiting ring (3), and the end face of the screw head is flush with or concave to the outer surface of the limiting ring (3).

Images