CN211175383U

CN211175383U - Bidirectional-rotation-based mechanical sealing structure for end face of imitated flying fish-shaped groove

Info

Publication number: CN211175383U
Application number: CN201921714235.1U
Authority: CN
Inventors: 于博; 郝木明; 李天照; 曹生照
Original assignee: China University of Petroleum East China
Current assignee: China University of Petroleum East China
Priority date: 2019-10-14
Filing date: 2019-10-14
Publication date: 2020-08-04
Anticipated expiration: 2029-10-14

Abstract

A bidirectional-rotation-based mechanical sealing structure for an end face of a flying fish-imitating groove belongs to the technical field of mechanical sealing. The flying fish imitating type fish tank comprises a movable ring and a stationary ring which are mechanically sealed, wherein a plurality of flying fish imitating type grooves are formed in the end face of a sealing ring of the movable ring or the stationary ring, each flying fish imitating type groove is composed of a pair of spiral grooves and a circular groove, and the pair of spiral grooves are composed of spiral lines with different spiral angles. The flying fish-imitating type grooves are distributed along the circumferential direction of the sealing end surface, and the flying fish-imitating type grooves are arranged from shallow to deep along the radial groove depth until the depth of the spiral surface groove is the same as that of the circular surface groove. The flying fish-like groove is positioned on the high-pressure side, namely the upstream, of the end face, the other side of the end face is the low-pressure side, namely the downstream, and the downstream of the end face is provided with a sealing dam area. The utility model has the characteristics of application scope is wide, long service life.

Description

Bidirectional-rotation-based mechanical sealing structure for end face of imitated flying fish-shaped groove

Technical Field

The utility model relates to a rotary machine's sealed end face structure, in particular to imitative fish type groove end face mechanical seal structure that flies that can two-way rotation is applicable to mechanical seal technical field.

Background

With the progress of science and technology and the development of modern industry, the requirement on the operation working condition of the petroleum and chemical industry is higher and higher, and the higher requirement is also put forward on the reliability of mechanical seal. Meanwhile, the transportation of products or the sealing of media exists in the industry, and friction consumption exists in the transportation process, so that the problems of energy consumption and material loss are directly influenced, and therefore, the improvement of the stability of the sealing performance of the device is an important research direction. The type and the structure of the dynamic pressure groove on the sealing end surface are the core for ensuring the sealing performance of the end surface and the key for ensuring that the mechanical seal can realize forward rotation and reverse rotation. Although the bidirectional rotating mechanical seal overcomes the disadvantage of unidirectional rotation, the carrying capacity of most fluid films is reduced. The hydrodynamic effect can enhance the bearing capacity of the seal, and the bearing capacity of the seal is improved, so that the performances of the seal, such as the service life, the loss and the like, can be improved, and the non-contact of the end faces is maintained. The groove type of the fluid dynamic pressure groove on the mechanical sealing end face is improved, the fluid dynamic pressure effect can be greatly increased, and the friction loss is reduced, so that the bearing capacity of a fluid film is improved, and the leakage amount of the sealing end face is reduced.

SUMMERY OF THE UTILITY MODEL

In order to overcome the problem that current two-way rotatory mechanical seal fluid film bearing capacity is low and the friction loss of terminal surface is big, the utility model provides a but two-way rotatory imitative fly fish type groove terminal surface mechanical seal structure.

The utility model adopts the technical proposal that:

the utility model provides a but two-way rotatory imitative flying fish type groove terminal surface mechanical seal structure, includes mechanical seal's rotating ring and quiet ring, set up a plurality of imitative flying fish type grooves on the sealing ring terminal surface (5) of rotating ring or quiet ring, imitative flying fish type groove comprises a pair of helicla flute (4) and a circular recess (3). The flying fish-imitating type grooves are circumferentially distributed along the sealing end face (5), and the flying fish-imitating type grooves are from shallow to deep along the radial groove depth until the spiral groove depth is the same as the circular groove depth. The flying fish-like groove is located on the high-pressure side, namely the upstream, of the end face (5), the other side of the end face (5) is located on the low-pressure side, namely the downstream, and a sealing dam area (6) is arranged on the downstream of the end face (5).

Furthermore, the flying fish-imitating type grooves are circumferentially distributed along the sealing end face (5).

Furthermore, the depth h of the flying fish-imitating groove_g＝3～20μm。

Further, the value range of the number N of the slots in the flying fish-imitating type groove is as follows: n is more than or equal to 4 and less than or equal to 16, wherein N is an even number.

Further, the pair of spiral grooves (4) are symmetrically distributed relative to the circular groove (3), the spiral angles of two spiral lines of the pair of spiral grooves (4) are different, wherein the spiral angle α of the spiral line I (1)₁Helix angle α with helix two (2)₂The value range of (1) is less than α₂/α₁≤4。

Further, the outer radius of the sealing ring is r₁The radius r of the groove root at the upstream of the simulated flying fish type groove_g1And r is_g1≤r₁The radius of the circular groove (3) is greater than or equal to 3 and less than or equal to 6 mm.

The utility model has the advantages and beneficial effects that:

1. the utility model discloses an imitative fish type groove that flies, the angle of two helices is different, has increased fluid dynamic pressure effect, is fit for high operating mode and seals.

2. The utility model discloses an imitative flying fish type groove's groove depth by the upper reaches to low reaches for from shallow to deep, the deep groove can produce fluid dynamic pressure effect under sealed normal operating conditions, the fluid that the shallow slot was stored can prevent that the low-speed lower seal face from producing the dry grinding, has strengthened fluid lubrication's effect, has reduced the wearing and tearing consumption that probably produces to prevent that the seal face from taking place to destroy, improved sealed wholeness ability.

3. The utility model discloses an imitative cell type in flying fish type groove be symmetrical structure, can realize seal structure's two-way rotation, can control and let out leakage quantity, and sealed whole application scope is wide, long service life.

Drawings

Fig. 1 is a schematic structural view of an end face of a flying fish-imitating groove according to a first embodiment of the present invention;

FIG. 2 is a schematic diagram of a slot structure of one cycle according to an embodiment of the present invention;

fig. 3 is a schematic view of geometric structural parameters of an end face of a fly-fish-imitating groove according to a first embodiment of the present invention;

FIG. 4 is a cross-sectional view of a flying fish-like trough according to a first embodiment of the present invention;

fig. 5 is a schematic structural view of an end face of a simulated flying fish-shaped groove according to a second embodiment of the present invention.

Detailed Description

The foregoing and other objects of the invention will be apparent from the following more particular description of the embodiments of the invention, as illustrated in the accompanying drawings.

Example one

Referring to fig. 1-4, the mechanical sealing structure of the end face of the flying fish-imitating groove capable of rotating in two directions comprises a movable ring and a stationary ring which are mechanically sealed, wherein a plurality of flying fish-imitating grooves are formed in the end face (5) of a sealing ring of the movable ring or the stationary ring, and each flying fish-imitating groove consists of a pair of spiral grooves (4) and a circular groove (3). The flying fish-imitating type grooves are circumferentially distributed along the sealing end face (5), and the flying fish-imitating type grooves are from shallow to deep along the radial groove depth until the spiral groove depth is the same as the circular groove depth. The flying fish-like groove is located on the high-pressure side, namely the upstream, of the end face (5), the other side of the end face (5) is located on the low-pressure side, namely the downstream, and a sealing dam area (6) is arranged on the downstream of the end face (5).

Furthermore, the depth h of the flying fish-imitating groove_g＝3～20μm。

Example two

Referring to FIG. 5, the difference between the first embodiment and the second embodiment is that the helix angle α of helix line one (1)₁Helix angle α with helix two (2)₂Ratio α of₂/α₁And the structure is more compact near the maximum value, so that the circumferential distribution number is increased, and the rest of the structure and the implementation mode are the same as those of the first embodiment.

The embodiments described in the present specification are only illustrative of the implementation forms of the present invention, and the protection scope of the present invention should not be considered as being limited to the specific examples set forth above, and various substitutions or modifications made by the ordinary technical knowledge and the conventional means in the field without departing from the technical idea of the present invention are included in the scope of the present invention.

Claims

1. A mechanical sealing structure of an end face of a fly-fish-imitating groove capable of rotating in two directions comprises a movable ring and a stationary ring which are mechanically sealed, wherein a plurality of fly-fish-imitating grooves are formed in the end face (5) of a sealing ring of the movable ring or the stationary ring, and each fly-fish-imitating groove consists of a pair of spiral grooves (4) and a circular groove (3); the flying fish-imitating type grooves are circumferentially distributed along the sealing end surface (5), and the flying fish-imitating type grooves are arranged from shallow to deep along the radial groove depth until the spiral groove depth is the same as the circular groove depth; the flying fish-like groove is located on the high-pressure side, namely the upstream, of the end face (5), the other side of the end face (5) is located on the low-pressure side, namely the downstream, and a sealing dam area (6) is arranged on the downstream of the end face (5).

2. The seal structure of claim 1, wherein: the flying fish-imitating type grooves are circumferentially distributed along the sealing end face (5).

3. The seal structure of claim 1, wherein: depth h of the flying fish-imitating type groove_g＝3～20μm。

4. The seal structure of claim 1, wherein: the value range of the number N of the slots of the flying fish-imitating type groove is as follows: n is more than or equal to 4 and less than or equal to 16, wherein N is an even number.

5. The sealing structure of claim 1, wherein the pair of spiral grooves (4) are symmetrically distributed with respect to the circular groove (3), and the spiral angles of the two spirals of the pair of spiral grooves (4) are different, wherein the spiral angle α of the first spiral (1) is₁Helix angle α with helix two (2)₂The value range of (1) is less than α₂/α₁≤4。

6. The seal structure of claim 5, wherein: the outer radius of the sealing ring is r₁The radius r of the groove root at the upstream of the simulated flying fish type groove_g1And r is_g1≤r₁The radius of the circular groove (3) has the following value range: r is more than or equal to 3 and less than or equal to 6 mm.