CN205350360U - Liquid film seal end face slot type structure that can two -way rotation - Google Patents

Abstract

The utility model relates to a bidirectionally rotatable liquid film seal end face groove structure, which belongs to the technical field of mechanical seals. It is characterized in that under the action of external force, the static ring and the moving ring fit each other to form a sealing end face, and any end face of the moving ring or the static ring is selected to be engraved with a groove shape, and each groove group consists of two radial air supply grooves and Composed of a pair of mirror-symmetrical dynamic pressure grooves, the radial air supply groove is rectangular, and the dynamic pressure groove is a herringbone-shaped groove. The two grooves are separated by a table without grooves, and the dynamic pressure groove is facing the air supply The trough, where the herringbone-shaped trough is located on the high-pressure side, that is, upstream, and the rectangular trough is located on the low-pressure side, that is, downstream. The groove groups are distributed along the circumferential direction of the sealing end face. The utility model has the advantages of good sealing performance, strong bearing capacity, bidirectional rotation and sealing, wide application range and the like.

Description

A two-way rotatable liquid film seal end face groove structure

technical field

The utility model relates to a liquid film sealing structure of a rotary fluid machine, in particular to a bidirectionally rotatable dynamic pressure type sealing end surface groove type, which belongs to the field of fluid dynamic sealing.

Background technique

Under the action of external force, the dynamic ring and the static ring are attached to each other, and a groove group is engraved on the sealing end face. The geometry of the dynamic pressure groove is the core content of the invention. Due to the dynamic pressure effect of the dynamic pressure groove, a continuous seal is formed between the two ends. , Stable fluid film, the film has a certain rigidity and bearing capacity, and finally makes the sealing end face in a stable non-contact state for a long time, to achieve the purpose of sealing. A good dynamic pressure groove can ensure that the rotating shaft can achieve the above functions when it rotates forward or reverse. However, the groove type on the sealing end surface of the current double-rotation sealing ring has relatively low fluid film stiffness, relatively small thickness of the fluid film formed between the dynamic and static rings, relatively weak dynamic pressure effect, low opening force, and limited application range. A small waiting letter to be resolved. Changing the groove shape of the hydrodynamic pressure groove on the sealing end surface is an effective and common means to enhance the hydrodynamic pressure effect of the end surface, reduce the leakage of the seal and prolong the service life of the seal.

Utility model content

In view of this, the utility model provides a new structural form of a double-rotation non-contact hydrodynamic mechanical seal groove. Through the innovation of the structure of the hydrodynamic pressure groove on the sealing end surface, the rotation axis can be rotated forward or reverse At this time, a continuous and stable sealing liquid film can be formed between the end faces of the dynamic and static ring seals, effectively realizing the non-contact operation under the condition of bidirectional rotation.

Bi-directional rotatable liquid film seal structure, including two sealing rings (moving ring, static ring), characterized in that: either end surface of the moving ring or static ring is engraved with groove groups, and each groove group (2 ) consists of two radial air supply grooves (5) and a pair of mirror-symmetrical dynamic pressure grooves (4), the radial air supply groove type is a rectangular groove (or trapezoidal groove), and the dynamic pressure groove is a herringbone-like groove ( or eight-shaped groove), the two grooves are separated by a non-grooving table (3), the dynamic pressure groove is facing the air supply groove, and the herringbone groove is located on the high pressure side (upstream), and the rectangular groove is located on the low pressure side (downstream) .

The two-way rotatable groove groups (2) are distributed circumferentially on the sealing end surface, and the number of groove groups arranged on the end surface (1) is 4 to 7 groups.

There is an isolation platform (3) between the high-pressure side dynamic pressure groove and the low-pressure side air supply groove, and the distance range is 4-7mm.

The center of the arc formed by the long groove root and the short groove root in the herringbone groove (4) is the same circle center O as the center of the outer circumference and the inner circumference of the sealing end surface (1). Corresponding to the center O, the radii of the short and long groove roots of the herringbone groove are R1 and R2 respectively; the radii of the inner and outer circumferences of the sealing end face (1) are Rg1 and Rg2 respectively. And, Rg1<R1≤R2<Rg2.

The opposite side of the dynamic pressure groove is provided with a radial air supply groove, and the air supply groove is separated from the dynamic pressure groove. The depth of the dynamic pressure groove (4) is 5-12um; the depth of the air supply groove (5) is 1-10um.

The included angle of a pair of air supply grooves (5) relative to the center O in the groove group (2) is Its range is 18°～24°.

The depth of the dynamic pressure groove (4) is unequal, and the groove depth gradually increases along the radius from the outer circle to the inner hole.

In the two-way rotatable groove set, the continuous line type of the dynamic pressure groove (4) can be helical or arc type; the continuous line type of the air supply groove (5) can be straight line.

The groove shape width (6) of the dynamic pressure groove in the groove group is 3-8mm; the width (7) of the air supply groove is 3-8mm.

The positive effect that the utility model has:

Bi-directional liquid lubricated non-contact mechanical seal structure. It can ensure that the dynamic pressure effect of the groove group can form an effective liquid film bearing capacity when the rotating shaft rotates in the forward or reverse direction, so as to ensure the liquid film lubrication. Thereby reducing friction and wear and improving the performance of the seal. Moreover, the groove structure is simple and easy to optimize the design, especially suitable for rotating machinery that may have reverse rotation, and has a flexible scope of application.

Description of drawings

Fig. 1 is a schematic diagram of the end face of the bidirectional rotating liquid film seal of the present invention;

Fig. 2 is a schematic diagram of the sealed end face of the trapezoidal groove for the air supply groove of the two-way rotating groove group of the present invention;

Fig. 3 is a schematic diagram of the sealed end faces with the same left and right groove roots of the two-way rotating groove group dynamic pressure groove of the utility model;

Fig. 4 is a schematic diagram of the sealing end surface of the two-way rotating groove group dynamic pressure groove of the utility model, whose left and right groove roots are the same, and the air supply groove is a trapezoidal groove;

Among them, 1-sealing ring, 2-two-way rotating groove group, 4-dynamic pressure groove, 5-air supply groove.

detailed description

Below in conjunction with the specific implementation of the embodiment shown in the accompanying drawings, the above content of the present utility model will be described in further detail.

Embodiment one

As shown in Figure 1, a bidirectionally rotatable liquid film seal structure includes two sealing rings (moving ring and static ring), and at least one of the sealing rings in the moving ring and static ring is provided with a plurality of Two-way rotatable groove set (2) distributed on the circumference of the end face. Each groove group is composed of two radial air supply grooves (5) and a pair of mirror-symmetrical dynamic pressure grooves (4). The types are separated by a platform (3) without slots, and the dynamic pressure groove is facing the air supply groove, wherein the herringbone-shaped groove is located on the high-pressure side, that is, upstream, and the rectangular groove is located on the low-pressure side, that is, downstream.

The two-way rotatable groove groups (2) are distributed circumferentially on the sealing end surface, and the number of groove groups arranged on the end surface (1) is 4 to 7 groups.

There is an isolation platform (3) between the high-pressure side dynamic pressure groove and the low-pressure side air supply groove, and the distance range is 4-7mm.

The center of the arc formed by the long groove root and the short groove root in the herringbone groove (4) is the same circle center O as the center of the outer circumference and the inner circumference of the sealing end surface (1). Corresponding to the center O, the radii of the short and long groove roots of the herringbone groove are R1 and R2 respectively; the radii of the inner and outer circumferences of the sealing end face (1) are Rg1 and Rg2 respectively. And, Rg1<R1≤R2<Rg2.

The opposite side of the dynamic pressure groove is provided with a radial air supply groove, and the air supply groove is separated from the dynamic pressure groove. The depth of the dynamic pressure groove (4) is 5-12um; the depth of the air supply groove (5) is 1-10um.

The included angle between a pair of air supply grooves (5) in the groove group (2) relative to the center O is θ1, and the range is 18°-24°.

The depth of the dynamic pressure groove (4) is unequal, and the groove depth gradually increases along the radius from the outer circle to the inner hole.

In the two-way rotatable groove set, the continuous line type of the dynamic pressure groove (4) can be helical or arc type; the continuous line type of the air supply groove (5) can be straight line.

The groove shape width (6) of the dynamic pressure groove in the groove group is 3-8mm; the width (7) of the air supply groove is 3-8mm.

Embodiment two

As shown in Figure 2, the difference between this embodiment and Embodiment 1 is that in the groove group, the radial air supply grooves are a pair of trapezoidal grooves. The included angle θ0 between the radial side of the trapezoidal groove and the radial side of the rectangular groove is 5°-10°, and the rest of the structure and implementation are the same as in the first embodiment.

Embodiment three

As shown in FIG. 3 , the difference between this embodiment and Embodiment 1 is that in the groove group, the left and right groove roots of the dynamic pressure groove type are completely identical in axis symmetry. The rest of the structure and implementation are the same as in Embodiment 1.

Embodiment Four

As shown in Figure 4, in the groove group described in this embodiment, the radial air supply groove is the same as the second embodiment, which is a pair of trapezoidal grooves; the dynamic pressure groove is the same as the third embodiment, and has an axisymmetric structure. The remaining implementation modes are the same as the first embodiment.

The content described in the embodiments of this specification is only an enumeration of the realization forms of the utility model concept, and the protection scope of the utility model should not be regarded as limited to the specific forms stated in the embodiments, without departing from the above-mentioned technical ideas of the present invention. Under certain circumstances, various replacements or changes made according to common technical knowledge and customary means in the field shall be included in the scope of the present invention.

Claims (9)

1. A liquid film seal end surface groove structure capable of bidirectional rotation, including two sealing rings, namely a moving ring and a static ring, characterized in that: either end surface of the moving ring or the static ring is engraved with a groove group, Each groove group (2) is composed of two radial air supply grooves (5) and a pair of mirror-symmetric dynamic pressure grooves (4). The radial air supply groove type can be rectangular or trapezoidal grooves, and the dynamic pressure groove can It is a herringbone-shaped groove or a figure-eight groove, and the two grooves are separated by a platform (3) without grooves. The dynamic pressure groove is facing the air supply groove, and the herringbone-shaped groove is located on the high pressure side, that is, upstream, and the rectangular groove is located on the high pressure side. The low pressure side is downstream. 2. A two-way rotatable liquid film seal end face groove structure according to claim 1, characterized in that: said two-way rotatable groove group (2) is distributed in the upper direction of the sealing end face, and the end face ( 1) The number of groove groups set on the top is 4 to 7 groups. 3. A two-way rotatable liquid film seal end surface groove structure according to claim 1, characterized in that: there is an isolation table (3) between the high pressure side dynamic pressure groove and the low pressure side air supply groove, The distance range is 4-7mm. 4. A two-way rotatable liquid film seal end surface groove structure according to claim 1, characterized in that: the center of the arc formed by the long groove root and the short groove root in the herringbone groove (4) The circle center of the outer circumference and the inner circumference of the sealing end surface (1) is the same circle center O; corresponding to the circle center O, the radii of the short groove root and the long groove root of the herringbone groove are respectively R1 and R2; The radii of the inner circumference and the outer circumference of the sealing end face (1) are Rg1 and Rg2 respectively, and Rg1<R1≤R2<Rg2. 5. A two-way rotatable liquid film seal end surface groove structure according to claim 1, characterized in that: the opposite side of the dynamic pressure groove is provided with a radial air supply groove, and the air supply groove and the dynamic pressure groove Separated from each other, the depth of the dynamic pressure groove (4) is 5-12um; the depth of the air supply groove (5) is 1-10um. 6. A two-way rotatable liquid film seal end surface groove structure according to claim 1, characterized in that: the pair of air supply grooves (5) in the groove group (2) are clamped relative to the center O The angle is θ1 and its range is 18°～24°. 7. A two-way rotatable liquid film seal end surface groove structure according to claim 1, characterized in that: the depth of the dynamic pressure groove (4) is not equal, and along the radius from the outer circle to the inner The groove depth gradually deepens in the direction of the hole. 8. A two-way rotatable liquid film seal end surface groove structure according to claim 1, characterized in that: in the two-way rotatable groove group, the groove type continuous line of the dynamic pressure groove (4) The shape can be helical type or circular arc type; the continuous line type of the air supply groove (5) is straight line type. 9. A two-way rotatable liquid film seal end face groove structure according to claim 1, characterized in that: the groove width (6) of the dynamic pressure groove in the groove group is 3-8mm; the width of the air supply groove (7) 3-8mm.