Combination of rotating and stationary rings for corrugated groove end face sealing device

Abstract

This invention belongs to the field of end-face sealing technology, specifically relating to a combined corrugated groove end-face sealing device consisting of a rotating ring and a stationary ring. The invention includes a rotating ring and a stationary ring that cooperate with each other through sealing end faces. The sealing end faces are respectively provided with corrugated grooves and notched grooves. The ring containing the corrugated groove is a wide ring, and the ring containing the notched groove is a narrow ring. The sealing end face width of the wide ring is greater than that of the narrow ring, and the notched groove is located on the outer ring surface of the narrow ring. The rotation path of the corrugated groove intersects with the cavity of the notched groove. This invention achieves an effective balance between sealing leakage and end-face lubrication, thereby providing continuous and effective lubrication and cooling for the friction pair of the end-face seal.

Description

Technical Field

[0001] This invention belongs to the field of end-face sealing technology, specifically relating to a corrugated groove end-face sealing device consisting of a dynamic ring and a stationary ring. Background Technology

[0002] Mechanical seals, also known as face seals, are leakage prevention devices consisting of at least one pair of end faces perpendicular to the axis of rotation, which remain in contact and slide relative to each other under the action of fluid pressure and the elastic force of the compensation mechanism. Traditional contact mechanical seals, when applied to various high-speed, high-pressure, or harsh operating conditions such as oil shortage, are prone to dry friction between the end faces, generating a large amount of frictional heat, leading to seal deformation, accelerated wear, and increased power consumption. Especially when the seal is restarted after a long period of inactivity, the end faces are very prone to suction, resulting in a very large starting torque that can easily damage the seal. Existing deep groove technology for the end faces typically involves creating grooves on the edge of one end face on the media side. This method has the problem that if the radial dimension of the groove area is too large, it can easily lead to excessive leakage; while if the radial dimension of the groove area is too small, there is insufficient lubrication of the end face. These issues urgently need to be addressed. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a combined corrugated groove end face sealing device with a dynamic ring and a stationary ring. This device achieves an effective balance between sealing leakage and end face lubrication, thereby providing continuous and effective lubrication and cooling for the friction pair of the end face seal.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A combined corrugated groove end face sealing device of dynamic and static rings includes a dynamic ring and a static ring that cooperate with each other by means of sealing end faces. The sealing end faces are respectively provided with corrugated grooves and notched grooves. The ring body where the corrugated groove is located is a wide ring, and the ring body where the notched groove is located is a narrow ring. The sealing end face width of the wide ring is greater than the sealing end face width of the narrow ring, and the opening part of the notched groove is located at the outer ring surface of the narrow ring. The rotation path of the corrugated groove and the cavity of the notched groove intersect.

[0006] Preferably, the notched groove and the corrugated groove are periodically distributed along the circumference of the ring body, and the intersection of the corrugated groove and the notched groove is located at the crest of the corrugated groove.

[0007] Preferably, the corrugated groove is formed in the middle of the sealing end face of the wide ring; when the wide ring and the narrow ring are in the same state, the radial distance between the outer wall of the corrugated groove crest and the outer ring surface of the narrow ring is 0.5 to 1 mm, and the radial distance between the inner wall of the corrugated groove trough and the inner ring surface of the narrow ring is greater than or equal to 1 / 3 of the width of the narrow ring; the radial depth of the notch is equal to the radial distance between the outer wall of the corrugated groove crest and the outer ring surface of the narrow ring.

[0008] Preferably, along the circumference of the wide or narrow ring, a set of corrugated units is formed from one crest of the corrugated groove to another adjacent crest, with the two crests arranged symmetrically; the inner circle of the crest forming the corrugated unit and the outer circle of the trough forming the corrugated unit are tangent to each other, and the diameter of the inner circle is less than or equal to the diameter of the outer circle.

[0009] Preferably, there are two intersection points of the two inner circles at the two crests of the same group of corrugated units, and the outer intersection point is located within a circle with the axis of the wide or narrow ring as the center and the distance from the center of the circle to the inner wall of the trough as the radius.

[0010] Preferably, from an axial perspective, the angle formed by the line connecting the first wave crest of a group of corrugated units to the axis of the wide or narrow ring and the line connecting the last wave crest to the axis of the wide or narrow ring is 30°.

[0011] Preferably, the corrugated unit gradually decreases in width and / or in depth from the two side crests to the middle trough.

[0012] Preferably, there are four or more corrugated units; the number of notches is four or more, and is an even number.

[0013] Preferably, the corrugated groove has a width of 0.2 to 1 mm and a depth of 5 μm to 0.5 mm; the notched groove is a semi-circular groove, a U-shaped groove, or a V-shaped groove, and the notched groove has a depth of 0.1 to 1 mm.

[0014] Preferably, the wide ring is a moving ring and the narrow ring is a stationary ring.

[0015] The beneficial effects of this invention are as follows:

[0016] 1) Through the above scheme, when the rotating ring and the stationary ring rotate relative to each other, the peak areas of the notch and the corrugated groove coincide. The liquid stored in the notch will enter and fill the corrugated groove under pressure. At this time, the liquid stored in the corrugated groove provides continuous and effective lubrication and cooling to the sealing end face during operation, especially to the sealing end face portion within the radial distribution area of ​​the corrugated groove.

[0017] 2) When the sealing end faces rotate relative to each other, the fluid inside the corrugated groove will flow and be squeezed, thereby generating a certain hydrodynamic pressure effect. The squeezing and flow of liquid from the inside of the groove to the end faces will form a micron-sized liquid film between the sealing end faces, so that the sealing end faces are in a non-contact liquid film lubrication state. In this way, the present invention can reduce wear between the sealing end faces, reduce the heat generated by wear between the sealing end faces, extend the service life of the seal, and effectively reduce the power consumption of the sealing end faces.

[0018] When the sealing end face is stationary, the probability of the notch and the corrugated groove peak areas overlapping is extremely small. Compared with the traditional one-sided grooved seal, it obviously has a better static pressure sealing effect and less leakage.

[0019] Of course, when the sealing end face rotates relative to each other, it is preferable that the notch and the corrugated groove crest area coincide; the notch can also be designed to coincide with other sections of the corrugated groove, which can also achieve its basic function to a certain extent.

[0020] 3) The corrugated groove stores a certain amount of lubricating liquid, which can effectively solve the problem of seal damage caused by the seal end faces easily sticking together when restarting after a long period of shutdown.

[0021] 4) Due to its inherent bandwidth, the corrugated groove has a significant distance between the trough and the crest, resulting in a wider end face area, larger lubrication area, and better cooling. Furthermore, compared to traditional edge-grooved end faces, the corrugated groove has a larger radial dam area for preventing leakage, thus providing better sealing performance during shutdown and preventing solid particles and other media from entering the sealing end face.

[0022] When dirt or solid particles enter the sealing end face, the corrugated grooves or notches opened on the corresponding ring body will also throw out the dirt or particles that have entered the sealing end face under the action of centrifugal force, effectively exerting the ability of the corrugated groove to prevent solid particle wear, thereby reducing abrasive wear on the sealing end face.

[0023] 5) Especially for oil-deficient sealing conditions, where the sealing liquid medium does not completely fill the sealing cavity, when the rotating ring rotates to the point where the corrugated groove and the notch groove coincide, the liquid at the bottom enters the corrugated groove and flows and is stored in the groove; when the sealing end face is in operation, the liquid in the corrugated groove can effectively overcome the problem of easy dry friction of the end face under oil-deficient conditions, with significant results.

[0024] In summary, this invention features a compact and rational design, achieving an effective balance between sealing leakage and end-face lubrication, thus providing continuous and effective lubrication and cooling for the friction pair of the end-face seal. Under the same design parameters, the sealing end-face width of this invention can be wider than that of ordinary mechanical seals, while simultaneously ensuring a good sealing effect with zero or low leakage during both shutdown and operation. The end-face deformation resistance under high pressure is also effectively guaranteed. This invention is applicable to liquid-lubricated shaft end sealing equipment in various rotating machinery, especially suitable for harsh operating conditions such as high speed, high pressure, high parameters, and oil-deficient lubrication. Attached Figure Description

[0025] Figure 1 This is an assembly diagram of the present invention;

[0026] Figure 2This is a schematic diagram of one embodiment of the corrugated groove on the moving ring;

[0027] Figure 3 This is a schematic diagram of the sealing end face of the stationary ring;

[0028] Figure 4 This is an axial view of the rotating ring and stationary ring after they have been fitted together.

[0029] Figure 5 This is a diagram showing the arrangement of the corrugated units;

[0030] Figure 6 This is a schematic diagram of another embodiment of the corrugated groove.

[0031] The actual correspondence between the reference numerals and component names in this invention is as follows:

[0032] a - Inner circle; b - Outer circle; c - Outer intersection point;

[0033] 10-Wide ring; 11-Corrugated groove; 11a-Corrugated unit; 20-Narrow ring; 21-Notched groove. Detailed Implementation

[0034] For ease of understanding, this section combines... Figure 1-6 The specific structure and operation of the present invention are further described below:

[0035] In the design of mechanical seals, the spring specific pressure p s The load factor B and p are two extremely critical parameters. s Generally, B is taken as 0.1 to 0.3 MPa. In balanced mechanical seals, B is generally taken as 0.65 to 0.85, and the formula is as follows:

[0036] Spring pressure ratio: F s For the spring compression force, A f This refers to the effective contact area of ​​the end face.

[0037] Load factor: A h A is the effective area for the sealing fluid pressure. f This represents the nominal contact area of ​​the end face.

[0038] After slotting the sealing end face, based on the above two design parameters, namely the spring ratio p... sWith the load factor B remaining constant, the nominal contact area of ​​the end face is obviously equal to the total sealing end face area of ​​the narrow ring 20 minus the area of ​​the bellows groove 11 and the notch groove 21. At this point, under the same spring pressure and load factor design value, by appropriately widening the sealing end face width of the wide ring 10 where the bellows groove 11 is located compared to a conventional mechanical seal, firstly, it ensures a good sealing effect with zero or low leakage during shutdown and operation; secondly, the relatively wider sealing end face results in better structural strength, making it less prone to deformation under high pressure; furthermore, the good lubrication of the sealing end face solves the problem of severe end face heating caused by the wider end face; finally, it solves the problem of seal damage caused by easy adhesion between the end faces during restart after a long shutdown.

[0039] Based on the aforementioned basic design intent, the present invention provides as follows: Figure 1-6 The specific embodiment shown is constructed in which, Figure 1-5 This is one embodiment, and Figure 6 Another embodiment:

[0040] exist Figure 1 As can be seen, when the moving ring (i.e., the wide ring 10) and the stationary ring (i.e., the narrow ring 20) are fitted together, they form a shape like... Figure 1 The sealing end faces shown are abutting each other. In actual design, this embodiment preferably arranges the corrugated groove 11 on the moving ring, that is, the moving ring forms a wide ring 10; correspondingly, the stationary ring with the notched groove 21 forms a narrow ring 20, such as... Figure 2 and Figure 3 As shown. On the other hand, for the corrugated groove 11 on the wide ring 10, it is preferably a continuous corrugated structure in the circumferential direction, that is, the corrugated units 11a that make up the corrugated groove 11 are continuous and connected end to end.

[0041] At this point, during actual assembly, if... Figure 4-5 As shown, the sealing end faces of the wide ring 10 and the narrow ring 20 fit together, and the lubricant replenishment effect is achieved by the intermittent conduction between the notch groove 21 cavity and the peaks of the corrugated groove 11.

[0042] In actual design, the notch groove 21 can be formed by recessing directly along the angle formed by the outer ring surface of the narrow ring 20 and the sealing end face, thus forming a notch structure on the sealing end face. The shape of the notch groove 21 can be a semi-circular groove, a U-shaped groove, or a V-shaped groove, or other types of notch-type structures. As for the corrugated groove 11, such as Figure 5As shown, the inner circle a forming the crest of the corrugated unit 11a and the outer circle b forming the trough of the corrugated unit 11a must be tangent to each other, and the diameter of the inner circle a is less than or equal to the diameter of the outer circle b; at the same time, there are two intersection points of the two inner circles a at the two crests of the same group of corrugated units 11a, and the outer intersection point c is located in a circle with the axis of the wide ring 10 or the narrow ring 20 as the center and the distance from the center to the inner wall of the trough as the radius.

[0043] As another embodiment of the present invention Figure 6 A groove-shaped scheme formed by combining discontinuous corrugated units 11a is provided. In this scheme, the corrugated units 11a are periodically distributed but not interconnected. The advantage is that it can store lubricant while making it easier to achieve zero or small leakage. It is especially beneficial for solving the problem of easy adhesion of the end face during the start-up process. It can be selected according to the application.

[0044] Furthermore, in the design, the width of the corrugated groove 11 gradually decreases or the depth gradually decreases in the area where it overlaps with the notched groove 21, as the fluid enters; or the corrugated unit 11a presents a shape from the two side peaks to the middle trough, that is, from the first peak to the last peak, the groove depth gradually decreases or the groove width gradually decreases. The advantages of the above design are: when the sealing end face rotates, the fluid flows in the corrugated groove 11, producing a significant large inflow and small outflow squeezing effect; at the same time, the moment the fluid is squeezed out of the corrugated groove 11 and enters the sealing end face, a significant hydrodynamic pressure effect is also generated, which is beneficial to actual lubrication.

[0045] Of course, those skilled in the art will recognize that the present invention is not limited to the details of the exemplary embodiments described above, but also includes the same or similar structures that can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0046] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0047] The technologies, shapes, and structures not described in detail in this invention are all known technologies.

Claims

1. A corrugated groove end face sealing device consisting of a rotating ring and a stationary ring, comprising a rotating ring and a stationary ring that cooperate with each other by means of sealing end faces, characterized in that: The sealing end face is respectively provided with a corrugated groove (11) and a notch groove (21). The ring body where the corrugated groove (11) is located is a wide ring (10), and the ring body where the notch groove (21) is located is a narrow ring (20). The sealing end face width of the wide ring (10) is greater than the sealing end face width of the narrow ring (20), and the opening part of the notch groove (21) is located on the outer ring surface of the narrow ring (20). The rotation path of the corrugated groove (11) and the groove cavity of the notch groove (21) intersect. The corrugated groove (11) is located in the middle of the sealing end face of the wide ring (10); the notched groove (21) and the corrugated groove (11) are periodically distributed along the circumference of the ring body.

2. The combined corrugated groove end face sealing device of dynamic ring and stationary ring according to claim 1, characterized in that: The intersection of the corrugated groove (11) and the notched groove (21) is located at the crest of the corrugated groove (11).

3. The combined corrugated groove end face sealing device of dynamic ring and stationary ring according to claim 2, characterized in that: When the wide ring and narrow ring are in the same state, the radial distance between the outer wall of the corrugated groove (11) crest and the outer ring surface of the narrow ring (20) is 0.5~1mm, and the radial distance between the inner wall of the corrugated groove (11) trough and the inner ring surface of the narrow ring (20) is greater than or equal to 1 / 3 of the width of the narrow ring (20); the radial depth of the notched groove (21) is equal to the radial distance between the outer wall of the corrugated groove (11) crest and the outer ring surface of the narrow ring (20).

4. A combined corrugated groove end face sealing device of dynamic ring and stationary ring according to claim 1, 2 or 3, characterized in that: Along the circumference of the wide ring (10) or narrow ring (20), a set of corrugated units (11a) is formed from one crest of the corrugated groove (11) to another adjacent crest, with the two crests arranged symmetrically; the inner circle (a) forming the crest of the corrugated unit (11a) and the outer circle (b) forming the trough of the corrugated unit (11a) are tangent to each other, and the diameter of the inner circle (a) is less than or equal to the diameter of the outer circle (b).

5. The combined corrugated groove end face sealing device of dynamic ring and stationary ring according to claim 4, characterized in that: The two inner circles (a) at the two crests of the same corrugated unit (11a) intersect at two points, and the outer intersection (c) is located in a circle with the axis of the wide ring (10) or the narrow ring (20) as the center and the distance from the center of the circle to the inner wall of the trough as the radius.

6. The combined corrugated groove end face sealing device of dynamic ring and stationary ring according to claim 4, characterized in that: From an axial perspective, the angle formed by the line connecting the first wave crest of a set of corrugated units (11a) to the axis of the wide ring (10) or narrow ring (20) and the line connecting the last wave crest to the axis of the wide ring (10) or narrow ring (20) is 30°.

7. The combined corrugated groove end face sealing device of dynamic ring and stationary ring according to claim 4, characterized in that: The corrugated unit (11a) gradually decreases in width and / or in depth from the two side crests to the middle trough.

8. The combined corrugated groove end face sealing device of dynamic ring and stationary ring according to claim 4, characterized in that: There are four or more corrugated units (11a); there are four or more notched slots (21), and the number is even.

9. A combined corrugated groove end face sealing device of dynamic ring and stationary ring according to claim 1, 2 or 3, characterized in that: The corrugated groove (11) has a width of 0.2~1mm and a depth of 5μm~0.5mm; the notched groove (21) is a semi-circular groove, a U-shaped groove or a V-shaped groove, and the notched groove (21) has a depth of 0.1~1mm.

10. A combined corrugated groove end face sealing device of dynamic ring and stationary ring according to claim 1, 2 or 3, characterized in that: The wide ring (10) is a moving ring, and the narrow ring (20) is a stationary ring.

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