Metal corrugated mechanical sealing ring structure

Abstract

The utility model relates to the technical field of metal corrugated mechanical sealing rings, in particular to a metal corrugated mechanical sealing ring structure. The sealing structure comprises a first shaft sleeve and a second shaft sleeve, the first shaft sleeve and the second shaft sleeve are connected and matched, a fixing seat is fixedly connected to the shaft side face of the first shaft sleeve, a mounting seat is in threaded fit with the interior of the fixing seat, and a sealing ring assembly is arranged on the upper surface of the mounting seat and used for sealing a gap between the first shaft sleeve and the second shaft sleeve. The elastic spring is arranged in the corrugated pipe, the elasticity of the elastic spring is used for providing initial pressure, good contact of a sealing face is ensured, meanwhile, the elasticity of the spring can compensate axial displacement and keep close contact between the fixed ring and the movable ring, and therefore efficient sealing can still be kept under the dynamic condition, and the sealing effect is good. Effective sealing can be maintained under different pressure and temperature conditions, the mounting base is matched with the fixing base through internal threads, and mounting and dismounting are convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of metal corrugated mechanical sealing rings, and specifically, to a structure of a metal corrugated mechanical sealing ring. Background Technique

[0002] A metal bellows is a pipe with an outer shape like regular waves. Common metal bellows are made of carbon steel, stainless steel, steel lined with plastic, aluminum, etc. It is mainly used for non-concentric axial transmission with a very small bending radius, or irregular turning, telescoping, or absorbing the thermal deformation of pipelines, etc., or for connecting pipelines to pipelines or pipelines to equipment in occasions where it is not convenient to install fixed elbows. As a sensitive element, shock-absorbing element, compensating element, sealing element, valve element and pipeline connecting piece, metal bellows are widely used in fields such as automatic control and measuring instruments, vacuum technology, mechanical industry, electric power industry, transportation and atomic energy industry. When connecting a rotating shaft and a machine body, there may be a gap in the middle. The existence of the gap and the lack of effective elastic support will cause greater vibration during the operation of the equipment, which not only affects the equipment performance, but may also cause resonance problems of other components, and the gap is prone to become a leakage channel for the medium;

[0003] Although existing ones will use ordinary mechanical sealing rings for sealing, however, ordinary sealing rings need to consume part of the balancing force when the dynamic ring and the shaft sleeve have relative displacement, resulting in insufficient followability, which may cause the end face not to reset in time after being opened, increasing the leakage risk. At the same time, there are various structural forms for transmitting torque during the operation of ordinary mechanical seals, and the complex torque transmission structure may lead to the failure of the transmission structure, increasing the risk of failure. In view of this, we propose a structure of a metal corrugated mechanical sealing ring. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a structure of a metal corrugated mechanical sealing ring to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the utility model provides a structure of a metal corrugated mechanical sealing ring, which includes a first shaft sleeve and a second shaft sleeve, and the first shaft sleeve and the second shaft sleeve are connected and matched. A fixed seat is fixedly connected to the shaft side of the first shaft sleeve, an installation seat is in threaded fit inside the fixed seat, and a sealing ring assembly is arranged on the upper surface of the installation seat, wherein:

[0006] The sealing ring assembly is used to seal the gap between the first shaft sleeve and the second shaft sleeve.

[0007] As a further improvement of this technical solution, the sealing ring assembly includes a bellows and an elastic spring. A cavity is arranged inside the bellows, wherein: the elastic spring is arranged inside the cavity, and the size of the elastic spring is adapted to the cavity.

[0008] As a further improvement of the present technical solution, the sealing ring assembly further comprises a movable ring, the lower surface of the movable ring is fixedly connected to the top end of the bellows, and the inner wall of the movable ring is symmetrically provided with limiting grooves.

[0009] As a further improvement of the present technical solution, a limiting block is symmetrically provided on the outer wall of the top end of the first sleeve, and the relative side walls of the limiting block match the relative sizes of the two inner walls of the limiting groove, and there is a gap between the internal height of the limiting groove and the height of the limiting block.

[0010] As a further improvement of the present technical solution, a fixing ring is fixedly connected to the outer wall of the bottom end of the second sleeve, and the lower surface of the fixing ring is in contact with the upper surface of the movable ring.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] In this metal bellows mechanical seal ring structure, an elastic spring is placed inside the bellows, and the elasticity of the elastic spring is used to provide initial pressure to ensure good contact of the sealing surface. At the same time, the elasticity of the spring can compensate for axial displacement and maintain close contact between the fixed ring and the movable ring, so that efficient sealing can be maintained under dynamic conditions, ensuring that effective sealing can be maintained under different pressure and temperature conditions; the mounting seat is matched with the fixed seat through internal threads. This threaded connection method is not only convenient for installation and disassembly, but also can provide stable support to ensure the normal operation of the sealing ring assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0014] Figure 2 This is a schematic diagram of the overall structure of the utility model;

[0015] Figure 3 It is a schematic cross-sectional view of the overall structure of the present invention;

[0016] Figure 4 For the utility model Figure 3 Schematic diagram of the structure at point A.

[0017] The meaning of each number in the figure is:

[0018] 100, first sleeve; 200, second sleeve; 101, fixed seat; 1010, mounting seat; 300, sealing ring assembly; 301, bellows; 302, elastic spring; 3010, cavity; 303, movable ring; 3030, limiting groove; 102, limiting block; 201, fixed ring. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0020] The metal bellows 301 is a kind of pipe with a regular wavy shape. Commonly used metal bellows 301 include those made of carbon steel, stainless steel, steel-lined plastic, aluminum, etc. It is mainly used for non-concentric axial transmission with a very small bending radius, or irregular turning, expansion and contraction, or absorbing the thermal deformation of the pipeline, etc., or for connecting pipelines to pipelines or pipelines to equipment in occasions where it is not convenient to install fixed elbows. As a sensitive element, shock-absorbing element, compensation element, sealing element, valve element and pipeline connecting piece, the metal bellows 301 is widely used in fields such as automatic control and measuring instruments, vacuum technology, mechanical industry, electric power industry, transportation and atomic energy industry. When connecting the rotating shaft and the machine body, there may be a gap in the middle. The existence of the gap and the lack of effective elastic support will cause greater vibration during the operation of the equipment, which not only affects the equipment performance, but may also cause resonance problems of other components, and the gap is likely to become a leakage channel for the medium.

[0021] Please refer to Figures 1 - 4 As shown, this embodiment provides a metal bellows mechanical seal structure, including a first shaft sleeve 100 and a second shaft sleeve 200. Considering that the existing clearance seal uses an ordinary mechanical seal for sealing, however, the ordinary seal needs to consume part of the balance force when the dynamic ring and the shaft sleeve have relative displacement, resulting in insufficient followability, which may cause the end face not to be reset in time after opening, increasing the leakage risk. At the same time, the structural forms of torque transmission during the operation of the ordinary mechanical seal are diverse, and the complex torque transmission structure may lead to the failure of the transmission structure, increasing the risk of failure. Therefore, specifically as follows: The first shaft sleeve 100 and the second shaft sleeve 200 are connected and matched. A fixed seat 101 is fixedly connected to the shaft side of the first shaft sleeve 100. An installation seat 1010 is in threaded fit inside the fixed seat 101. A seal ring assembly 300 is arranged on the upper surface of the installation seat 1010, where:

[0022] The seal ring assembly 300 is used to seal the gap between the first shaft sleeve 100 and the second shaft sleeve 200.

[0023] The improvement of this embodiment lies in:

[0024] The mounting base 1010 is fitted with the fixed base 101 through internal threads. This threaded connection method is not only convenient for installation and disassembly but also provides stable support to ensure the normal operation of the seal ring assembly 300. The seal ring assembly 300 ensures effective sealing under different pressure and temperature conditions.

[0025] Specifically, the seal ring assembly 300 includes a bellows 301 and an elastic spring 302. A cavity 3010 is provided inside the bellows 301, where: the elastic spring 302 is arranged inside the cavity 3010, and the size of the elastic spring 302 is adapted to that of the cavity 3010. Since the bellows 301 itself has good axial elasticity and can adapt to axial displacement changes, the built-in elastic spring 302 provides the necessary pre-tightening force to ensure good contact pressure between the seal ring and the shaft sleeve all the time, thus effectively preventing medium leakage.

[0026] The seal ring assembly 300 further includes a movable ring 303. The lower surface of the movable ring 303 is fixedly connected to the top end of the bellows 301. Limiting grooves 3030 are symmetrically formed on the inner wall of the movable ring 303. Through the design of the movable ring 303, it not only serves as a connection bridge between the bellows 301 and the first shaft sleeve 100, but the formed limiting grooves 3030 also provide additional radial stability for the entire seal ring assembly 300. The design of the above structure not only ensures the sealing performance but also enhances the adaptability and compensation ability of the assembly.

[0027] Secondly, limiting blocks 102 are symmetrically arranged on the outer wall of the top end of the first shaft sleeve 100. The opposite side walls of the limiting blocks 102 are dimensionally matched with the opposite inner walls of the limiting grooves 3030. There is a gap between the inner height of the limiting grooves 3030 and the height of the limiting blocks 102. Through this gap between the inner height of the limiting grooves 3030 and the height of the limiting blocks 102, this gap not only allows a certain amount of axial displacement to adapt to the thermal expansion or vibration of the shaft but also ensures that the seal ring assembly 300 has a certain degree of freedom when subjected to external forces, thus protecting the structure from damage.

[0028] In addition, a fixed ring 201 is fixedly connected to the outer wall of the bottom end of the second shaft sleeve 200. The lower surface of the fixed ring 201 is in contact with the upper surface of the movable ring 303. Through the contact between the fixed ring 201 and the movable ring 303, together with the function of the seal ring assembly 300, the first bearing and the second bearing are hermetically connected.

[0029] When the metal corrugated mechanical seal ring structure of the present utility model is specifically used, the second bearing is attached to the first bearing for connection, and the elasticity of the elastic spring 302 is used to provide the initial pressure to ensure good contact of the sealing surface. At the same time, the telescopic performance of the spring can compensate for the axial displacement and maintain the close contact between the fixed ring 201 and the movable ring 303. If it is desired to replace the seal ring assembly 300, it can be removed by simply rotating through the thread fit between the internal thread of the mounting seat 1010 and the thread of the fixed seat 101. Conversely, it can be quickly installed.

[0030] The above shows and describes the basic principles, main features and advantages of the present utility model. Those skilled in the art of this industry should understand that the present utility model is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only preferred examples of the present utility model and are not used to limit the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A metal corrugated mechanical seal ring structure, comprising a first shaft sleeve (100) and a second shaft sleeve (200), the first shaft sleeve (100) and the second shaft sleeve (200) are connected and matched with each other, and it is characterized in that: A fixing seat (101) is fixedly connected to the shaft side surface of the first bushing (100). An installation seat (1010) is in threaded fit with the inside of the fixing seat (101). A sealing ring assembly (300) is arranged on the upper surface of the installation seat (1010), where: The sealing ring assembly (300) is used to seal the gap between the first bushing (100) and the second bushing (200).

2. The metal corrugated mechanical seal ring structure according to claim 1, wherein: The sealing ring assembly (300) includes a corrugated pipe (301) and an elastic spring (302). A cavity (3010) is arranged inside the corrugated pipe (301), where: The elastic spring (302) is arranged inside the cavity (3010), and the size of the elastic spring (302) is adapted to the cavity (3010).

3. The metal corrugated mechanical seal ring structure according to claim 1, characterized in that: The sealing ring assembly (300) further includes a movable ring (303). The lower surface of the movable ring (303) is fixedly connected to the top end of the corrugated pipe (301). Limiting grooves (3030) are symmetrically formed on the inner wall of the movable ring (303).

4. The metal corrugated mechanical seal ring structure according to claim 1, wherein: Limiting blocks (102) are symmetrically arranged on the outer wall of the top end of the first bushing (100). The opposite side walls of the limiting blocks (102) are matched with the opposite inner walls of the limiting grooves (3030) in size, and there is a gap between the inner height of the limiting grooves (3030) and the height of the limiting blocks (102).

5. The metal corrugated mechanical seal ring structure according to claim 1, characterized in that: A fixing ring (201) is fixedly connected to the outer wall of the bottom end of the second bushing (200). The lower surface of the fixing ring (201) is attached to the upper surface of the movable ring (303).

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