CN220622748U

CN220622748U - Mechanical seal of tetrafluoro corrugated pipe

Info

Publication number: CN220622748U
Application number: CN202322374630.2U
Authority: CN
Inventors: 邬晨晖; 王斌; 俞旭腾
Original assignee: Ningbo Anmu Sealing Technology Co ltd
Current assignee: Ningbo Anmu Sealing Technology Co ltd
Priority date: 2023-09-01
Filing date: 2023-09-01
Publication date: 2024-03-19
Anticipated expiration: 2033-09-01

Abstract

The utility model provides a mechanical seal of a tetrafluoro corrugated pipe, which belongs to the technical field of mechanical seals and comprises the following components: the movable assembly comprises a tetrafluoro corrugated pipe, a spring and a movable ring, wherein the spring is arranged in the tetrafluoro corrugated pipe and enables the tetrafluoro corrugated pipe to obtain a movement trend of stretching, and the movable ring is connected with one end of the tetrafluoro corrugated pipe; the beneficial effects of the utility model are as follows: the movable component adopts a polytetrafluoroethylene corrugated pipe to separate the spring from the outside, and the polytetrafluoroethylene corrugated pipe has the advantages of high and low temperature resistance, corrosion resistance, wear resistance, aging resistance and difficult deformation.

Description

Mechanical seal of tetrafluoro corrugated pipe

Technical Field

The utility model belongs to the technical field of mechanical sealing, and relates to a mechanical sealing of a tetrafluoro corrugated pipe.

Background

Mechanical seals are widely used in pumps, compressors, and stirring machines. The function of the device is to isolate the leakage path between the rotating component (such as the shaft) and the static structural cavity and prevent the harmful medium in the cavity from leaking to the outside. The mechanical seal is typically comprised of a moving assembly secured to the shaft and a stationary assembly secured to the chamber.

The spring mechanical seal is a common mechanical seal structure, and the moving assembly of the spring mechanical seal consists of a movable ring, a sealing ring, a pressure element (spring) and a metal structural member; the static assembly is relatively simple, and is composed of a grooved static ring and a rubber sealing element sleeved in the groove, wherein the dynamic ring and the static ring are a pair of friction pairs with high flatness, a sealing surface is formed under the action of a pressure element, and a gap between the dynamic ring and the static ring in relative rotation is in a micron order, so that internal fluid can be effectively prevented from leaking from the sealing surface. The spring of the moving assembly is compressed when installed, thereby providing a positive pressure on the sealing surface. This positive pressure must counteract the thrust caused by the fluid pressure inside the seal to keep the sealing surfaces closed. If the design working pressure of the seal is high, the positive pressure of the elastic element at the working height is high, so that high friction torque is brought to the dynamic and static ring, the ring surface is lost, and the pressure element is needed to compensate the loss of the ring surface.

In the existing spring mechanical seal, a corrugated pipe is covered on the outer side of the spring, the corrugated pipe is made of rubber generally, rubber is softened and deformed at high temperature, dust prevention failure is caused, sealing pressure is overlarge due to rubber hardening at low temperature, and accelerated abrasion failure of a sealing surface is caused. And also easily causes the problems of fracture, cracking, and the like.

Disclosure of Invention

The utility model aims to solve the problems in the prior art and provides a mechanical seal of a tetrafluoro corrugated pipe.

The aim of the utility model can be achieved by the following technical scheme: a tetrafluoro bellows mechanical seal comprising:

the movable assembly comprises a tetrafluoro corrugated pipe, a spring and a movable ring, wherein the spring is installed in the tetrafluoro corrugated pipe and enables the tetrafluoro corrugated pipe to obtain a movement trend of stretching, and the movable ring is connected with one end of the tetrafluoro corrugated pipe.

Preferably, the tetrafluoro bellows comprises a folding telescopic part, a free end part and a fixed end part, wherein the free end part and the fixed end part are respectively positioned at two ends of the folding telescopic part, the free end part is provided with a clamp spring, the fixed end part is provided with a gasket, two ends of the spring are respectively in abutting connection with the gasket and the clamp spring, and the folding telescopic part generates a movement trend of stretching, and the movable ring is connected with the free end part.

Preferably, the free end part is internally provided with a step surface, and the clamp spring is clamped on the step surface.

Preferably, the tetrafluoro bellows is a polytetrafluoroethylene piece.

Preferably, the movable ring is in sealing connection with the free end part through a first O-shaped ring.

Preferably, the movable ring is provided with a movable ring surface, the movable ring surface is contacted with the movable ring surface, a sealing surface is formed between the movable ring surface and the movable ring surface, and the movable ring is provided with positive pressure jointed with the movable ring by the cooperation of the tetrafluoro bellows and the spring.

Preferably, the static assembly further comprises a second O-shaped ring sleeved on the static ring.

Preferably, the device further comprises a shaft sleeve, wherein a part of the shaft sleeve penetrates through the tetrafluoro corrugated pipe, and the spring is located between the shaft sleeve and the folding telescopic part.

Preferably, the end of the shaft sleeve is in abutting connection with the gasket and abuts against the gasket on the fixed end.

Compared with the prior art, the utility model has the beneficial effects that:

1. the movable component adopts a polytetrafluoroethylene corrugated pipe to separate the spring from the outside, and the polytetrafluoroethylene corrugated pipe has the advantages of high and low temperature resistance, corrosion resistance, wear resistance, aging resistance and difficult deformation.

2. Because the tetrafluoro bellows covers the spring, the dustproof effect can be achieved, the problems of corrosion, abrasion, failure and the like of internal parts caused by external dust and dirt entering the equipment are effectively prevented, and the stability and the service life of the equipment are ensured.

Drawings

Fig. 1 is a schematic structural view of a mechanical seal of a tetrafluoro bellows of the present utility model.

Fig. 2 is a schematic structural view of the tetrafluoro bellows of the present utility model.

In the figure, 100, tetrafluoro bellows; 110. folding the telescopic part; 120. a free end; 121. a step surface; 130. fixing the end part; 140. clamping springs; 150. a gasket; 200. a spring; 300. a moving ring; 400. a first O-ring; 500. a stationary ring; 600. a second O-ring; 700. a shaft sleeve.

Detailed Description

The following are specific embodiments of the present utility model and the technical solutions of the present utility model will be further described with reference to the accompanying drawings, but the present utility model is not limited to these embodiments.

As shown in fig. 1 and 2, a mechanical seal for a tetrafluoro bellows includes: the movable assembly comprises a tetrafluoro corrugated pipe 100, a spring 200 and a movable ring 300, wherein the spring 200 is installed in the tetrafluoro corrugated pipe 100 and enables the tetrafluoro corrugated pipe 100 to obtain a movement trend of stretching, and the movable ring 300 is connected with one end of the tetrafluoro corrugated pipe 100.

The working principle of the moving component is as follows: the spring 200 can push the tetrafluoro bellows 100 to stretch, that is, both ends of the tetrafluoro bellows 100 have a relatively far movement tendency under the action of the spring 200, since the moving ring 300 is installed at one end of the tetrafluoro bellows 100, when the other end of the tetrafluoro bellows 100 is fixed, the spring 200 can apply a positive pressure to the moving ring 300 through one end of the tetrafluoro bellows 100, so that the moving ring 300 can closely fit (close the sealing surface) with the stationary ring 500 and compensate for abrasion of the ring surface.

The tetrafluoro bellows 100 is a polytetrafluoroethylene member, and the tetrafluoro bellows 100 is not easily softened and deformed in a high-temperature environment, so that the dustproof protection effect is not lost, accelerated abrasion of a sealing surface due to overlarge sealing pressure caused by hardening in a low-temperature environment is not caused, and the problems of fracture, cracking and the like are not easily caused. Because the tetrafluoro bellows 100 covers the spring 200, the dustproof effect can be achieved, the problems of corrosion, abrasion, failure and the like of internal parts caused by external dust and dirt entering the equipment are effectively prevented, and the stability and the service life of the equipment are ensured.

The movable assembly adopts a polytetrafluoroethylene corrugated pipe to separate the spring 200 from the outside, and the polytetrafluoroethylene corrugated pipe 100 has the advantages of high and low temperature resistance, corrosion resistance, wear resistance, aging resistance and difficult deformation.

On the basis of the above embodiment, the tetrafluoro bellows 100 includes the folding telescopic portion 110, the free end portion 120 and the fixed end portion 130 are respectively located at two ends of the folding telescopic portion 110, the free end portion 120 is provided with the clamp spring 140, the fixed end portion 130 is provided with the gasket 150, two ends of the spring 200 are respectively in abutting connection with the gasket 150 and the clamp spring 140, and the folding telescopic portion 110 generates a movement trend of stretching, and the movable ring 300 is connected with the free end portion 120.

The folding expansion and contraction part 110 has a bellows-like telescopic structure, and the fixed end 130 and the rotating shaft are fixed at least in the axial direction, and the free end 120 is movable relative to the fixed end 130 due to the existence of the folding expansion and contraction part 110 which is telescopically folded. The spring 200 has a movement tendency to push the folding bellows 110 to extend when the power is compressed, thereby transmitting positive pressure to the moving ring 300 through the free end 120.

The design of the folded extension 110 effectively reduces the pressure carried by the spring 200, so that the matched spring 200 is not easy to have the problems of metal fatigue, low working pressure and failure. The simple structure also makes the installation process more time-saving.

The two ends of the spring 200 are respectively in abutting connection with the gasket 150 and the clamp spring 140, the gasket 150 plays a role of a gasket, and the clamp spring 140 can limit the spring 200 from falling out.

In the above embodiment, the free end 120 has the stepped surface 121 therein, and the clip 140 is engaged with the stepped surface 121. When the clamp spring 140 is installed in the free end 120, one side of the clamp spring 140 is propped against the stepped surface 121, and the other side of the clamp spring 140 is propped against the spring 200, so that the axial movement of the clamp spring 140 is limited.

In addition to the above embodiment, the movable ring 300 and the free end 120 are hermetically connected by the first O-ring 400.

As shown in fig. 1, the mechanical seal further comprises a static assembly, the static assembly comprises a static ring 500, the static ring 500 is in surface contact with the moving ring 300, and a sealing surface is formed between the static ring 500 and the moving ring 300, and the tetrafluoro bellows 100 is matched with the spring 200 to provide positive pressure for the moving ring 300 to be jointed with the static ring 500.

On the basis of the embodiment, the static assembly further comprises a second O-ring 600, and the second O-ring 600 is sleeved on the static ring 500. It should be noted that the second O-ring 600 is located between the stationary ring 500 and the cavity structure, so that the stationary ring 500 and the cavity are kept sealed.

In addition to the above embodiment, the present utility model further includes a sleeve 700, where a portion of the sleeve 700 is inserted into the tetrafluoro bellows 100, and the spring 200 is located between the sleeve 700 and the folding expansion portion 110.

In the above embodiment, the end of the sleeve 700 abuts against the spacer 150 and presses the spacer 150 against the fixed end 130.

When the mechanical seal is used, the rotating shaft is arranged in the shaft sleeve 700 in a penetrating way, the shaft sleeve 700 can be driven to rotate when the rotating shaft rotates, the spring 200 and the clamp spring 140 are sleeved on the shaft sleeve 700, the static ring 500 and the dynamic ring 300 are positioned on the outer side of the shaft sleeve 700 or the rotating shaft, and the fixed end 130 is fixedly connected with the rotating shaft. The spring 200 is in a compressed state and the fold-over bellows 110 is in a folded state, the spring 200 transmitting positive pressure to the moving ring 300 through the free end 120, thereby causing the moving ring 300 to engage the stationary ring 500 and closing the sealing surfaces. When the annulus wears, the spring 200 expands the folded telescoping portion 110 and the free end 120 moves toward the static ring 500, thereby compensating for the amount of annulus wear.

When the mechanical seal is assembled, the gasket 150 is firstly installed at the bottom of the tetrafluoro corrugated pipe 100, even if the gasket 150 is in abutting connection with the inner end surface of the fixed end 130, then the spring 200 is put in, one end of the spring 200 is in abutting connection with the gasket 150, then the clamp spring 140 is clamped into the free end 120 to block the spring 200, the spring 200 is prevented from being ejected, then the moving ring 300 and the first O-shaped ring 400 are installed on the tetrafluoro corrugated pipe 100, the shaft sleeve 700 is inserted into the tetrafluoro corrugated pipe 100, the end part of the shaft sleeve 700 abuts against the gasket 150, and finally the static assembly is installed.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.

Furthermore, descriptions such as those referred to herein as "first," "second," "a," and the like are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or an implicit indication of the number of features being indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In addition, the technical solutions of the embodiments of the present utility model may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should be considered as not existing, and not falling within the scope of protection claimed by the present utility model.

Claims

1. A tetrafluoro bellows mechanical seal, comprising:

the movable assembly comprises a tetrafluoro corrugated pipe (100), a spring (200) and a movable ring (300), wherein the spring (200) is installed in the tetrafluoro corrugated pipe (100) and enables the tetrafluoro corrugated pipe (100) to obtain a movement trend of stretching, and the movable ring (300) is connected with one end of the tetrafluoro corrugated pipe (100).

2. A mechanical seal for a tetrafluoro bellows as claimed in claim 1, wherein: the tetrafluoro corrugated pipe (100) comprises a folding telescopic part (110), a free end part (120) and a fixed end part (130), wherein the free end part (120) and the fixed end part (130) are respectively located at two ends of the folding telescopic part (110), the free end part (120) is provided with a clamp spring (140), the fixed end part (130) is provided with a gasket (150), two ends of the spring (200) are respectively in interference connection with the gasket (150) and the clamp spring (140) and enable the folding telescopic part (110) to generate a movement trend of stretching, and the movable ring (300) is connected with the free end part (120).

3. A mechanical seal for a tetrafluoro bellows as claimed in claim 2, wherein: the free end part (120) is internally provided with a step surface (121), and the clamp spring (140) is clamped on the step surface (121).

4. A mechanical seal for a tetrafluoro bellows as claimed in claim 1 or 2, characterized in that: the tetrafluoro corrugated pipe (100) is a polytetrafluoroethylene piece.

5. A mechanical seal for a tetrafluoro bellows as claimed in claim 2, wherein: the movable ring (300) is in sealing connection with the free end (120) through a first O-shaped ring (400).

6. A mechanical seal for a tetrafluoro bellows as claimed in claim 2, wherein: still include quiet subassembly, quiet subassembly includes quiet ring (500), quiet ring (500) with moving ring (300) face-to-face contact and form sealed face between the two, tetrafluoro bellows (100) with spring (200) cooperation is for moving ring (300) provide with still the positive pressure of moving ring (500) laminating.

7. A mechanical seal for a tetrafluoro bellows as set forth in claim 6, characterized in that: the static assembly further comprises a second O-shaped ring (600), and the second O-shaped ring (600) is sleeved on the static ring (500).

8. A mechanical seal for a tetrafluoro bellows as claimed in claim 2 or 6, wherein: the novel fluorine-containing corrugated pipe further comprises a shaft sleeve (700), a part of the shaft sleeve (700) penetrates through the polytetrafluoroethylene corrugated pipe (100), and the spring (200) is located between the shaft sleeve (700) and the folding telescopic part (110).

9. A mechanical seal for a tetrafluoro bellows as claimed in claim 8, wherein: the end of the shaft sleeve (700) is in abutting connection with the gasket (150) and abuts the gasket (150) against the fixed end (130).