Sealing ring with bee wing groove end face structure and mechanical sealing device

Abstract

The utility model discloses a sealing ring with a bee wing groove end face structure and a mechanical sealing device, in the sealing ring, the bee wing groove end face structure comprises a sealing end face and a plurality of bee wing groove sets arranged on the sealing end face, and the bee wing groove sets are evenly arranged in the circumferential direction of the sealing end face. The bee wing groove set comprises two bee wing grooves which are symmetrical in the radial direction of the sealing ring. Wherein the number of the bee wing groove groups is not less than four; the bee wing groove comprises a front wing groove matched with the front face shape of a front wing of a bee and a rear wing groove matched with the front face shape of a rear wing of the bee, the wing head of the front wing groove is connected with the wing head of the rear wing groove, and the wing head of the bee wing groove is cut off by the outer edge line of the sealing end face. According to the sealing ring, the dynamic pressure effect of end face fluid can be enhanced, so that the bearing capacity of an end face fluid film is improved, and the sealing operation stability is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical seals, in particular to a sealing ring with a honeycomb wing groove end face structure and a mechanical sealing device. Background Art

[0002] Mechanical seals are widely used as dynamic seals for rotating shafts. They usually include a stationary ring (stationary ring), a rotating ring (dynamic ring), a stationary ring seat, a sleeve, a push ring, a spring, etc. Mechanical seals can be divided into contact and non-contact types. The non-contact type has higher stability and longer service life. According to the direction of rotation, they can be divided into single-direction and double-direction. A typical way to achieve non-contact operation of the sealing surface is to use the fluid dynamic pressure effect formed by the flow of the medium between the sealing surfaces to generate the corresponding fluid film opening force and fluid film stiffness, so that the two sealing end faces are separated by the fluid film to achieve non-contact operation.

[0003] Improving the surface structure of the sealing end face is an effective technical means to enhance its fluid dynamic pressure effect. At present, usually on one or both sides of the two sealing end faces of the static ring and the dynamic ring, a groove with a certain depth and shape is opened, among which the most typical ones are spiral grooves with equal groove depth for single rotation and "T" grooves for double rotation. However, the fluid dynamic pressure effect of the above sealing end face structure is not good. Utility Model Content

[0004] The utility model provides a sealing ring and a mechanical sealing device with a honeycomb wing groove end face structure, which can enhance the dynamic pressure effect of the end face fluid to increase the end face fluid film bearing capacity, thereby improving the sealing operation stability.

[0005] The utility model is realized by the following technical solutions:

[0006] In a first aspect, the utility model provides a sealing ring having a honeycomb wing groove end face structure, wherein the honeycomb wing groove end face structure comprises a sealing end face and a plurality of honeycomb wing groove groups arranged on the sealing end face, wherein the plurality of honeycomb wing groove groups are evenly arranged along the circumference of the sealing end face, and the honeycomb wing groove groups comprise two honeycomb wing grooves symmetrical along the radial direction of the sealing ring; wherein the number of the honeycomb wing groove groups is not less than four;

[0007] The bee wing groove comprises a front wing groove adapted to the front shape of the bee's front wing and a rear wing groove adapted to the front shape of the bee's rear wing. The wing heads of the front wing groove and the rear wing groove are connected, and the wing heads of the bee wing groove are cut off by the outer edge line of the sealing end surface.

[0008] Furthermore, the edge profile of the rear wing groove includes a first curve, a second curve, a third curve and a fourth curve connected in sequence in a closed loop, the first curve is a portion of the outer edge line of the sealing end surface, the second curve and the third curve, as well as the third curve and the fourth curve are connected in a smooth transition; wherein the second curve, the third curve and the fourth curve are all fitting curves, and compared with the second curve, the fourth curve is closer to the front wing groove.

[0009] Furthermore, the front wing groove includes a fifth curve, a sixth curve and a seventh curve connected in a closed loop in sequence, the fifth curve is a portion of the outer edge line of the sealing end surface, and the sixth curve and the seventh curve are smoothly transitioned to each other; wherein, the sixth curve and the seventh curve are both fitting curves, and compared with the seventh curve, the sixth curve is closer to the rear wing groove.

[0010] Furthermore, the second curve and the third curve, as well as the third curve and the fourth curve are connected by a circular arc for smooth transition, and the sixth curve and the seventh curve are connected by a circular arc for smooth transition.

[0011] Furthermore, the ratio of the lengths of the second curve, the third curve and the fourth curve is 5-6:1:3.6-4.2; and the ratio of the lengths of the seventh curve to the sixth curve is 1-1.2:1.

[0012] Furthermore, the central angle of the fifth curve is θ1, the central angle of the first curve is θ2, in one of the honeycomb wing groove groups, the central angle of the outer edge line of the sealing end surface between the two front wing grooves is θ3, and the transition curve between the second curve and the third curve is tangent to a radial line of the sealing end surface, and the central angle corresponding to the outer edge line of the sealing end surface cut by the radial line and the second curve is θ4, wherein θ1>θ2, θ3≦θ1+θ2, θ4:(θ1+θ2)=0.5~2.

[0013] Furthermore, the depth of the hind wing groove is h1, and the depth of the front wing groove is h2, wherein h1=2-20 μm, h2=2-20 μm, and h2≥h1.

[0014] Furthermore, at the intersection of the first curve and the second curve, an angle between a tangent line of the first curve and a tangent line of the second curve is 10-60°.

[0015] In a second aspect, the utility model provides a mechanical sealing device, comprising a sealing ring with a honeycomb groove end face structure as described above.

[0016] Furthermore, it includes a dynamic ring, a static ring and an elastic compensation mechanism, the dynamic ring abuts against the static ring, at least one of the dynamic ring and the static ring is provided with a honeycomb groove end face structure, and the elastic compensation mechanism is suitable for providing elastic compensation for the dynamic ring or the static ring.

[0017] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0018] The sealing ring of the utility model has a honeycomb wing groove end face structure, which includes a sealing end face and a plurality of honeycomb wing groove groups. The profile groove of the sealing end face draws on the honeycomb wing structure of a bee, and imitates the appearance of the front and rear wings of the bee, so that a plurality of honeycomb wing groove groups are arranged on the surface of the sealing end face, and each honeycomb wing groove group includes two symmetrical honeycomb wing grooves, which can realize bidirectional rotation and form a strong fluid dynamic pressure effect. Each honeycomb wing groove includes a double-channel structure of a front wing groove and a rear wing groove, which can produce a stronger guiding effect and pumping effect on the gas, so that the fluid converges at the groove root of the honeycomb wing groove and is sheared and squeezed, forming a sufficient dynamic pressure effect, further improving the bearing capacity of the end face, so that the end face is easy to open quickly at a low speed. At the same time, the front wing groove and the rear wing groove have a wider groove root outlet, and have a more stable air film under the same film thickness. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the embodiments of the present utility model, constitute a part of this application, and do not constitute a limitation of the embodiments of the present utility model. In the drawings:

[0020] Figure 1 This is a schematic structural diagram of a sealing ring with a honeycomb groove end surface structure according to an embodiment of the utility model;

[0021] Figure 2 for Figure 1 Schematic diagram of the structure of the honeycomb wing slot;

[0022] Figure 3 for Figure 1 A partial enlarged view of the wing groove group of the Chinese honey bee;

[0023] Figure 4 for Figure 1 Cross-sectional view of EE;

[0024] Figure 5 It is a schematic diagram of the structure of the mechanical seal in the example of the present utility model.

[0025] Marks and corresponding parts names in the attached drawings:

[0026] 100-sealing ring;

[0027] 10-sealing end surface; 20-bee wing groove; 21-front wing groove; 211-fifth curve; 212-sixth curve; 213-seventh curve; 214-arc line; 22-hind wing groove; 221-first curve; 222-second curve; 223-third curve; 224-fourth curve;

[0028] 31-static ring; 32-dynamic ring; 33-dynamic ring seat; 34-anti-rotation pin; 35-static ring seat; 36-spring; 37-push ring; 38-pressure sleeve; 39-sealing ring; 40-tolerance ring; 41-rotating shaft. DETAILED DESCRIPTION

[0029] As described in the background technology, improving the surface structure of the sealing end face is an effective technical means to enhance its fluid dynamic pressure effect. At present, a groove with a certain depth and shape is usually opened on one or both sides of the two sealing end faces of the static ring and the dynamic ring. Among them, the most typical ones are spiral grooves with equal groove depth for single rotation and "T" grooves for double rotation. However, the fluid dynamic pressure effect of the above sealing end face structure is not good.

[0030] Based on this, the inventors created the sealing ring with a honeycomb groove end face structure of the present application to solve the above-mentioned technical problems.

[0031] In order to make the purpose, technical solutions and advantages of the utility model more clearly understood, the utility model is further described in detail below in conjunction with embodiments and drawings. The schematic implementation manner of the utility model and its description are only used to explain the utility model and are not intended to limit the utility model.

[0032] Example

[0033] First, see Figures 1 to 4 The utility model provides a sealing ring 100 with a honeycomb-wing groove end face structure, wherein the honeycomb-wing groove end face structure includes a sealing end face 10 and a plurality of honeycomb-wing groove groups arranged on the sealing end face 10. For example, the sealing ring 100 may be a stationary ring or a dynamic ring in a mechanical seal. The plurality of honeycomb-wing groove groups are evenly arranged along the circumference of the sealing end face 10, and the honeycomb-wing groove group includes two radially symmetrical honeycomb-wing grooves 20 along the sealing ring 100. Through the design of the symmetrical bidirectional honeycomb-wing grooves 20, a strong fluid dynamic pressure effect can be formed during bidirectional rotation. Among them, the number of the honeycomb-wing groove groups is not less than four (for example, the number of the honeycomb-wing groove groups can be 4-32).

[0034] The bee wing slot 20 includes a front wing slot 21 adapted to the front shape of the bee's front wing and a rear wing slot 22 adapted to the front shape of the bee's rear wing. The wing heads of the front wing slot 21 and the rear wing slot 22 are connected, and the wing heads of the bee wing slot 20 are cut off by the outer edge of the sealing end face 10. For example, the bee wing slot 20 can be the shape of the bee's front wing and rear wing when they are unfolded. Here, the outer edge of the sealing end face 10 refers to the outer circle of the sealing end face 10. For example, in some embodiments, the gap between the front wing slot 21 and the rear wing slot 22 can be eliminated, that is, there is no sixth curve 212 and fourth curve 224 described below.

[0035] The sealing ring 100 of the utility model has a honeycomb wing groove end face structure, which includes a sealing end face 10 and a plurality of honeycomb wing groove groups. The profile groove of the sealing end face 10 draws on the honeycomb wing structure of a bee, imitating the appearance of the front wings and the rear wings of the bee, so that a plurality of honeycomb wing groove groups are arranged on the surface of the sealing end face 10, and each honeycomb wing groove group includes two symmetrical honeycomb wing grooves 20, which can realize bidirectional rotation and form a strong fluid dynamic pressure effect. Each honeycomb wing groove 20 includes a double-channel structure of a front wing groove 21 and a rear wing groove 22, which can produce a stronger guiding effect and pumping effect on the gas, so that the fluid converges at the groove root of the honeycomb wing groove 20 and is sheared and squeezed, forming a sufficient dynamic pressure effect, further improving the bearing capacity of the end face, so that the end face is easy to open quickly at a low speed. At the same time, the front wing groove 21 and the rear wing groove 22 have a wider groove root outlet, and have a more stable air film under the same film thickness.

[0036] In another embodiment, the edge profile of the rear wing groove 22 includes a first curve 221, a second curve 222, a third curve 223 and a fourth curve 224 connected in a closed loop in sequence, the first curve 221 is a portion of the outer edge of the sealing end surface 10, the second curve 222 and the third curve 223, and the third curve 223 and the fourth curve 224 are all smoothly transitioned and connected; wherein the second curve 222, the third curve 223 and the fourth curve 224 are all fitting curves, and compared with the second curve 222, the fourth curve 224 is closer to the front wing groove 21. Such a configuration facilitates the mold design of the rear wing groove 22.

[0037] In another embodiment, the front wing groove 21 includes a fifth curve 211, a sixth curve 212 and a seventh curve 213 connected in a closed loop in sequence, the fifth curve 211 is a portion of the outer edge of the sealing end surface 10, and the sixth curve 212 and the seventh curve 213 are smoothly transitioned and connected; wherein the sixth curve 212 and the seventh curve 213 are both fitting curves, and compared with the seventh curve 213, the sixth curve 212 is closer to the rear wing groove 22. Such a configuration facilitates the mold design of the rear wing groove 22.

[0038] Preferably, the second curve 222 and the third curve 223, and the third curve 223 and the fourth curve 224 are connected by a circular arc 214 for smooth transition, and the sixth curve 212 and the seventh curve 213 are connected by a circular arc 214 for smooth transition. Such a configuration facilitates mold design and effectively reduces stress concentration.

[0039] In another embodiment, the length ratio of the second curve 222, the third curve 223 and the fourth curve 224 is 5-6:1:3.6-4.2 (for example, 5.6:1:3.91); the length ratio of the seventh curve 213 to the sixth curve 212 is 1-1.2:1 (for example, 1.1:1), the center angle of the fifth curve 211 is θ1, the center angle of the first curve 221 is θ2, and the center angle of the outer edge of the sealing end surface 10 between the two front wing grooves 21 in one honeycomb wing groove group is θ3. , the transition curve between the second curve 222 and the third curve 223 is tangent to a radial line of the sealing end face 10, and the central angle corresponding to the outer edge of the sealing end face 10 cut by the radial line and the second curve 222 is θ4, wherein θ1>θ2, θ3≦θ1+θ2, θ4:(θ1+θ2)=0.5~2, at the intersection of the first curve 221 and the second curve 222, the angle between the tangent of the first curve 221 and the tangent of the second curve 222 is 10-60° (such as Figure 2 In this way, by changing the length ratio of each curve of the fitting curve of the honeycomb wing slot 20 imitating the airfoil, the position of the honeycomb wing slot 20 and the angle of the honeycomb wing slot 20, the honeycomb wing type multi-channel slot can be stably operated under different working conditions, that is, it can be applied to a wider operating range.

[0040] In another embodiment, the depth of the rear wing groove 22 is h1, and the depth of the front wing groove 21 is h2, wherein h1=2-20 μm, h2=2-20 μm, and h2≥h1. In this configuration, the front wing groove 21 is a variable depth groove, which refers to the angle of attack of the wings of high-speed flying bees, satisfies aerodynamics, and enables the dynamic and static rings to generate a certain fluid static pressure under static pressure conditions, reducing the relative wear of the dynamic and static rings during start-up and stop. At the same time, the variable depth groove can generate a stronger air film opening force relative to the rear wing groove 22 during rotation, so that the sealing device can also generate a better fluid dynamic pressure effect when rotating at a low speed.

[0041] In a second aspect, the utility model provides a mechanical sealing device, comprising a sealing ring with a honeycomb groove end face structure as described above.

[0042] In another embodiment, it includes a dynamic ring, a static ring and an elastic compensation mechanism, the dynamic ring abuts against the static ring, at least one of the dynamic ring and the static ring is provided with a honeycomb groove end face structure, and the elastic compensation mechanism is suitable for providing elastic compensation for the dynamic ring or the static ring.

[0043] The present mechanical sealing device is described below by means of a specific example.

[0044] Will Figures 1 to 4 The sealing ring 100 is installed as the dynamic ring 32 in a specific mechanical sealing device, see Figure 5 As shown, the stationary ring 31 is a floating ring 32. The dynamic ring seat 33 is a sleeve structure; the dynamic ring seat 33 is radially sleeved on the outer cylindrical surface of the rotating shaft 41 with its inner hole surface, axially contacts the step surface at the shoulder of the rotating shaft 41, and is fixedly connected to the rotating shaft 41 in the circumferential direction and rotates synchronously. The dynamic ring 32 is radially expanded on the outer circumferential surface of the dynamic ring seat 33 by the tolerance ring 40, axially contacts the step surface of the dynamic ring seat 33 and is axially compressed by the compression sleeve 38, and is fixedly connected to the dynamic ring seat 33 in the circumferential direction and rotates synchronously. Therefore, the dynamic ring 32 can rotate synchronously with the dynamic ring seat 33 and the rotating shaft 41. The stationary ring 31 and the dynamic ring 32 are coaxially arranged opposite to each other, and their opposite end faces are sealing surfaces. The stationary ring 31 is radially sleeved on the stationary ring seat 35 and remains relatively still with the stationary ring seat 35. It is supported by the push ring 37 and the spring 36 in the axial direction and is positioned by the anti-rotation pin 34 in the circumferential direction, so that the stationary ring 31 can only float freely in the axial direction and cannot rotate with the rotating shaft 41. A sealing ring 39 is installed on the inner diameter side of the push ring 37 that contacts the stationary ring 31 and seals with the stationary ring seat 35. After running this set of mechanical sealing devices, it was found that this set of equipment has lower leakage than ordinary spiral grooves, can rotate forward and reverse, and can generate a stronger air film opening force, so that the sealing device can also produce a better fluid dynamic pressure effect when rotating at a low speed.

[0045] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only the specific implementation method of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A sealing ring with a honeycomb groove end face structure, characterized in that: The honeycomb wing groove end face structure comprises a sealing end face and a plurality of honeycomb wing groove groups arranged on the sealing end face, wherein the plurality of honeycomb wing groove groups are evenly arranged along the circumference of the sealing end face, and the honeycomb wing groove group comprises two honeycomb wing grooves which are symmetrical along the radial direction of the sealing ring; wherein the number of the honeycomb wing groove groups is not less than four; The bee wing groove comprises a front wing groove adapted to the front shape of the bee's front wing and a rear wing groove adapted to the front shape of the bee's rear wing. The wing heads of the front wing groove and the rear wing groove are connected, and the wing heads of the bee wing groove are cut off by the outer edge line of the sealing end surface.

2. The sealing ring with a honeycomb groove end surface structure according to claim 1, characterized in that: The edge profile of the rear wing groove includes a first curve, a second curve, a third curve and a fourth curve connected in a closed loop in sequence, the first curve is a portion of the outer edge line of the sealing end surface, the second curve and the third curve, as well as the third curve and the fourth curve are all smoothly transitioned to each other; wherein the second curve, the third curve and the fourth curve are all fitting curves, and compared with the second curve, the fourth curve is closer to the front wing groove.

3. The sealing ring with a honeycomb groove end surface structure according to claim 2, characterized in that: The front wing groove includes a fifth curve, a sixth curve and a seventh curve connected in a closed loop in sequence, the fifth curve is a portion of the outer edge line of the sealing end surface, and the sixth curve and the seventh curve are smoothly transitioned to each other; wherein the sixth curve and the seventh curve are both fitting curves, and compared with the seventh curve, the sixth curve is closer to the rear wing groove.

4. The sealing ring with a honeycomb groove end surface structure according to claim 3, characterized in that: The second curve and the third curve, as well as the third curve and the fourth curve are connected by a circular arc for smooth transition, and the sixth curve and the seventh curve are connected by a circular arc for smooth transition.

5. The sealing ring with a honeycomb groove end surface structure according to claim 4, characterized in that: The length ratio of the second curve, the third curve and the fourth curve is 5-6:1:3.6-4.2; the length ratio of the seventh curve to the sixth curve is 1-1.2:

1.

6. The sealing ring with a honeycomb groove end surface structure according to claim 5, characterized in that: The central angle of the fifth curve is θ1, the central angle of the first curve is θ2, in one of the bee wing groove groups, the central angle of the outer edge line of the sealing end surface between the two front wing grooves is θ3, and the transition curve between the second curve and the third curve is tangent to a radial line of the sealing end surface, and the central angle corresponding to the outer edge line of the sealing end surface cut by the radial line and the second curve is θ4, wherein θ1>θ2, θ3≦θ1+θ2, θ4:(θ1+θ2)=0.5~2.

7. The sealing ring with a honeycomb wing groove end surface structure according to claim 6, characterized in that: The depth of the hind wing groove is h1, and the depth of the front wing groove is h2, wherein h1=2-20 μm, h2=2-20 μm, and h2≥h1.

8. The sealing ring with a honeycomb groove end surface structure according to claim 3, characterized in that: At the intersection of the first curve and the second curve, an angle between a tangent line of the first curve and a tangent line of the second curve is 10-60°.

9. A mechanical sealing device, characterized in that: A sealing ring with a honeycomb wing groove end face structure comprising any one of claims 1 to 8.

10. The mechanical sealing device according to claim 9, characterized in that: It includes a dynamic ring, a static ring and an elastic compensation mechanism, the dynamic ring abuts against the static ring, at least one of the dynamic ring and the static ring is provided with a honeycomb groove end face structure, and the elastic compensation mechanism is suitable for providing elastic compensation for the dynamic ring or the static ring.

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