Step type combined sealing element used for reciprocating motion and capable of compensating radial run-out

Abstract

The utility model relates to the technical field of step type combined sealing elements, and discloses a step type combined sealing element used for reciprocating motion and capable of compensating radial runout, which comprises a shell, a groove is arranged in the shell, a rubber pad is fixedly connected in the groove, a notch is arranged in the rubber pad, and the groove is fixedly connected with the rubber pad. And a polytetrafluoroethylene sealing ring is fixedly connected to the interior of the notch, springs are fixedly connected to the periphery of the interior of the groove, the lubricating mechanism comprises an oil inlet pipe, and the bottom end of the oil inlet pipe is fixedly connected to the right side of the top of the shell. In the utility model, when the shaft jumps in a large radial direction, the teflon sealing ring moves along with the shaft and extrudes the rubber pad, one side deforms, the other side tightly wraps, keeps interference and inclines in the axial direction, the arc surface of the outer ring of the teflon sealing ring can adjust the position, so that the sealing is stable and reliable, the teflon sealing ring adapts to the movement change of the shaft, and a good sealing effect is maintained, thereby realizing that the sealing force is always kept vertical to the shaft; and blocking or sealing leakage cannot occur.

Description

Technical Field

[0001] The utility model relates to the technical field of stepped combined seals, in particular to a stepped combined seal used for reciprocating motion and capable of compensating radial runout. Background Art

[0002] The stepped combination seal consists of an O-ring and a polytetrafluoroethylene sealing ring. The O-ring provides elastic compensation, and the polytetrafluoroethylene sealing ring has an interference fit, which produces a higher initial contact stress on the sealing surface to form a seal. The stepped combination seal is a single-acting seal, mainly for shaft sealing, with low friction, no creep, small starting force, and high pressure resistance. The O-ring is made of nitrile rubber, and fluororubber is also used in special cases. The polytetrafluoroethylene sealing ring is generally filled with polytetrafluoroethylene material or modified polytetrafluoroethylene material.

[0003] In the existing stepped combination seal, the compression amount of the elastomer is fixed. When the moving shaft has a large radial runout, the elastomer cannot perform radial compensation because it is installed in the groove. The stepped combination seal will cause seal eccentricity, resulting in increased wear on one side of the PTFE sealing ring, reduced sealing performance, and reduced compression between the PTFE sealing ring and the elastomer, resulting in a leakage channel between the PTFE sealing ring and the elastomer. Utility Model Content

[0004] In order to make up for the above shortcomings, the utility model provides a stepped combined seal for reciprocating motion that can compensate for radial runout, aiming to improve the problem in the prior art that radial compensation cannot be performed because the elastomer is installed in the groove, resulting in a leakage channel between the PTFE sealing ring and the elastomer.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solution: a stepped combined seal for reciprocating motion and compensating for radial runout, comprising a shell, a groove being provided inside the shell, a rubber pad being fixedly connected to the inside of the groove, a notch being provided inside the rubber pad, a polytetrafluoroethylene sealing ring being fixedly connected to the inside of the notch, springs being fixedly connected to the inside of the groove on all sides, and a lubrication mechanism being provided on the top right side of the shell.

[0006] Through the above technical solution: when the shaft undergoes large radial runout, due to the gap between the rubber pad and the housing, the PTFE sealing ring deviates with the shaft and squeezes the rubber pad. The rubber pad on the runout side is deformed, while the other side remains tightly wrapped, and no gap is generated. The PTFE sealing ring is always in interference fit. When the axial movement is tilted, the arc surface of the outer ring of the PTFE sealing ring comes into play, and the tilt position can be flexibly adjusted back and forth, effectively ensuring the stability and reliability of the seal, thereby achieving the goal of always keeping the sealing force perpendicular to the shaft, and preventing jamming or sealing leakage.

[0007] As a further description of the above technical solution:

[0008] The lubrication mechanism includes an oil inlet pipe, the bottom end of which is fixedly connected to the top right side of the outer shell, a round hole is provided on the top right side of the outer shell, the internal thread of the oil inlet pipe is connected to a fixing column, the inner top of the groove is fixedly connected to an oil storage bar, and a plurality of oil outlet holes are provided around the inside of the oil storage bar.

[0009] Through the above technical solution: lubricating oil flows in from the oil inlet pipe and is smoothly introduced due to its connectivity with the circular hole on the top of the shell. The fixed column with threads inside the oil inlet pipe can filter out impurities and protect subsequent components. The inflowing oil is stored in the oil storage bar. When lubrication is needed, it seeps out evenly through the multiple oil outlet holes around the oil storage bar, infiltrating the rubber pad in the sealing assembly, reducing its operating friction and wear, and effectively maintaining the efficient and stable operation of the seal, thereby extending the service life of the seal and maintaining good sealing performance.

[0010] As a further description of the above technical solution:

[0011] A shock-absorbing ring is fixedly connected to the outer wall of the shell, and a plurality of friction columns are fixedly connected around the outer wall of the shock-absorbing ring.

[0012] Through the above technical solution: the shock-absorbing ring on the outer wall of the shell is used for shock absorption, and the multiple friction columns around the outer wall further reduce vibration interference.

[0013] As a further description of the above technical solution:

[0014] A plurality of anti-skid pads are fixedly connected to the outer wall of the shock-absorbing ring, and the plurality of anti-skid pads are all of smooth design.

[0015] Through the above technical solution: the multiple anti-slip pads on the outer wall of the shock-absorbing ring are designed to be smooth, which increases the friction when contacting with the outside.

[0016] As a further description of the above technical solution:

[0017] The top of the fixed column is fixedly connected with a rotating block, and the shape of the rotating block is hexagonal.

[0018] Through the above technical solution: the hexagonal rotating block on the top of the fixed column is convenient for the user to apply force and twist it for operating the oil inlet pipe.

[0019] As a further description of the above technical solution:

[0020] A circular groove is provided on the top of the rubber pad, and a sealing ring is fixedly connected inside the circular groove.

[0021] Through the above technical solution: a sealing ring is fixed in the circular groove on the top of the rubber pad, providing a waterproof function for the seal and effectively preventing moisture from entering.

[0022] As a further description of the above technical solution:

[0023] The diameters of the notch and the polytetrafluoroethylene sealing ring are equal, and the polytetrafluoroethylene sealing ring can be clamped inside the notch.

[0024] Through the above technical solution: the groove and the PTFE sealing ring are precisely matched to ensure a tight fit.

[0025] As a further description of the above technical solution:

[0026] The rear ends of the plurality of springs are equidistantly surrounded inside the groove, and the front ends of the plurality of springs are fixedly connected to the outer wall of the rubber pad.

[0027] Through the above technical solution: multiple springs are arranged in the groove in an equidistant and circular manner, the front end is firmly connected to the outer wall of the rubber pad, and can be flexibly adjusted to maintain a good sealing effect.

[0028] The utility model has the following beneficial effects:

[0029] 1. In the present invention, when the shaft experiences large radial runout, due to the gap between the rubber pad and the housing, the PTFE sealing ring deviates with the shaft and squeezes the rubber pad. The rubber pad on the runout side is deformed, while the other side remains tightly wrapped, and no gap is generated. The PTFE sealing ring is always in interference fit. When the axial movement tilts, the arc surface of the outer ring of the PTFE sealing ring plays a role, and the tilt position can be flexibly adjusted forward and backward, effectively ensuring the stability and reliability of the seal, thereby achieving the goal of always keeping the sealing force perpendicular to the shaft, and preventing jamming or sealing leakage.

[0030] 2. In the utility model, lubricating oil flows in from the oil inlet pipe and is smoothly introduced by virtue of its connectivity with the circular hole on the top of the shell. The fixing column connected to the inner thread of the oil inlet pipe can filter out impurities and protect subsequent components. The inflowing oil is stored in the oil storage bar. When lubrication is needed, it seeps out evenly through the multiple oil outlet holes around the oil storage bar, infiltrating the rubber pad in the sealing component, reducing its operating friction and wear, and effectively maintaining the efficient and stable operation of the seal, thereby extending the service life of the seal and maintaining good sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A three-dimensional diagram of a stepped combined seal for reciprocating motion and compensating radial runout proposed by the present invention;

[0032] Figure 2 This is a front view of a stepped combined seal for reciprocating motion and compensating radial runout proposed by the present invention;

[0033] Figure 3 This is a right side view of a stepped combined seal for reciprocating motion and compensating radial runout proposed by the present invention;

[0034] Figure 4 This is a disassembled diagram of a groove of a stepped combined seal for reciprocating motion and compensating radial runout proposed by the present invention;

[0035] Figure 5 This is a structural schematic diagram of an oil outlet hole of a stepped combined seal for reciprocating motion and compensating radial runout proposed by the utility model.

[0036] Legend:

[0037] 1. Housing; 2. Lubrication mechanism; 201. Round hole; 202. Oil inlet pipe; 203. Fixed column; 204. Oil storage stick; 205. Oil outlet hole; 3. Groove; 4. Rubber pad; 5. Notch; 6. PTFE sealing ring; 7. Spring; 8. Shock absorber; 9. Friction column; 10. Anti-slip pad; 11. Rotating block; 12. Round groove; 13. Sealing ring. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0039] Reference Figure 1 and Figure 4 The utility model provides an embodiment of a stepped combined seal for reciprocating motion and compensating radial runout, comprising a housing 1, the housing 1 being made of metal, the interior of the housing 1 being provided with a groove 3 for preventing a rubber pad 4 from being worn, the interior of the groove 3 being fixedly connected to the rubber pad 4, the interior of the rubber pad 4 being provided with a notch 5 for accommodating a polytetrafluoroethylene sealing ring 6, the interior of the notch 5 being fixedly connected to the polytetrafluoroethylene sealing ring 6, the interior of the groove 3 being fixedly connected to springs 7 being fixedly connected all around to reduce pressure, a lubrication mechanism 2 being provided on the top right side of the housing 1 to reduce wear of the rubber pad 4,;

[0040] Specifically, the outermost shell 1 and the rubber pad 4 inside the groove 3 are vulcanized together, and there is space between the rubber pad 4 and the shell 1. The outer ring of the polytetrafluoroethylene sealing ring 6 inside the notch 5 is an arc surface, with an inclined surface of ten degrees on the left and right sides, and is interference fitted with the middle rubber pad 4. The middle rubber pad 4 is stretched outward. The springs 7 fixed around the groove 3 can effectively buffer and reduce pressure shock, making the sealing structure more stable and durable. The lubrication mechanism 2 on the top right side of the shell 1 can provide lubrication in time to reduce the wear of the rubber pad 4 during work.

[0041] Reference Figure 4 and Figure 5 The lubricating mechanism 2 includes an oil inlet pipe 202, through which the lubricating oil enters. The bottom end of the oil inlet pipe 202 is fixedly connected to the top right side of the housing 1. A circular hole 201 is provided on the top right side of the housing 1. The internal thread of the oil inlet pipe 202 is connected to a fixing column 203 to prevent impurities from entering the interior. An oil storage bar 204 is fixedly connected to the inner top of the groove 3 for placing the lubricating oil. A plurality of oil outlet holes 205 are provided around the inside of the oil storage bar 204 for discharging the oil.

[0042] Specifically, the lubricating oil enters through the oil inlet pipe 202, the bottom of the oil inlet pipe 202 is fixed to the right side of the top of the shell 1, and is connected to the circular hole 201 on the right side of the top of the shell 1. The internal thread of the oil inlet pipe 202 is connected to the fixing column 203, which effectively blocks the entry of impurities. The oil storage bar 204 at the top of the inner side of the groove 3 is used to store the lubricating oil, and the multiple oil outlet holes 205 opened around the oil storage bar 204 can make the lubricating oil flow out evenly.

[0043] Reference Figure 1 、 Figure 2 and Figure 3 The outer wall of the housing 1 is fixedly connected to a shock-absorbing ring 8, and a plurality of friction columns 9 are fixedly connected around the outer wall of the shock-absorbing ring 8 to reduce vibration. A plurality of anti-slip pads 10 are fixedly connected around the outer wall of the shock-absorbing ring 8. The plurality of anti-slip pads 10 are all smooth in design to increase friction. The top of the fixed column 203 is fixedly connected to a rotating block 11. The shape of the rotating block 11 is hexagonal, which is convenient for twisting the fixed column 203.

[0044] Specifically, the shock-absorbing ring 8 on the outer wall of the shell 1 is used for shock absorption, and the multiple friction columns 9 around the outer wall further reduce vibration interference. The multiple anti-slip pads 10 are designed to be smooth to increase the friction when in contact with the outside. The hexagonal rotating block 11 on the top of the fixed column 203 is convenient for the user to apply force and twist, easily control the position state of the fixed column 203, and facilitate the maintenance and operation of the oil inlet pipe 202.

[0045] Reference Figure 4 , a circular groove 12 is opened on the top of the rubber pad 4, and a sealing ring 13 is fixedly connected to the inside of the circular groove 12 for waterproofing. The diameters of the notch 5 and the PTFE sealing ring 6 are equal. The PTFE sealing ring 6 can be snapped into the inside of the notch 5. The rear ends of the multiple springs 7 are equidistantly surrounded by the inside of the groove 3. The front ends of the multiple springs 7 are fixedly connected to the outer wall of the rubber pad 4, which improves the reliability and adaptability of the seal and extends the service life of the seal.

[0046] Specifically, a sealing ring 13 is fixed in the circular groove 12 on the top of the rubber pad 4, providing a waterproof function for the seal and effectively preventing moisture from intruding. The notch 5 is adapted to the PTFE sealing ring 6 to ensure a tight fit. Multiple springs 7 are arranged in an equidistant and surrounding manner in the groove 3. The front end is firmly connected to the outer wall of the rubber pad 4 and can be flexibly adjusted to maintain a good sealing effect, thereby extending its service life and improving reliability and adaptability.

[0047] Working principle: When the stepped combination seal that can compensate for radial runout is working, when the moving shaft has a large radial runout, the PTFE sealing ring 6 and the shaft will deviate together. Because there is space between the rubber pad 4 and the housing 1, the PTFE sealing ring 6 will press the rubber pad 4 into the space, while the PTFE sealing ring 6 on the other side of the runout is always tightly wrapped by the rubber pad 4, and there will be no gap caused by the runout. Therefore, the PTFE sealing ring 6 always maintains an interference fit. When the axial movement is tilted, the PTFE sealing ring 6 with a circular arc surface on the outer ring can adjust the tilt position back and forth, always keeping the sealing force perpendicular to the shaft, and there will be no jamming or sealing leakage.

[0048] In addition, the lubricating oil first enters through the oil inlet pipe 202. Since the oil inlet pipe 202 is connected to the circular hole 201 on the top of the shell 1, the lubricating oil can flow in. The fixed column 203 in the oil inlet pipe 202 is fixed by a threaded connection. Its function is to filter out impurities in the lubricating oil and prevent impurities from entering the subsequent structure. The entered lubricating oil flows into the oil storage bar 204 for storage. When lubrication is needed, the lubricating oil flows out evenly through the multiple oil outlet holes 205 around the oil storage bar 204, thereby lubricating the rubber pad 4 inside the sealing component, reducing its friction and wear during operation, ensuring that the seal can operate more smoothly and stably, extending the service life of the seal and maintaining good sealing performance.

[0049] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A stepped composite seal for reciprocating motion capable of compensating radial runout, comprising a housing (1), characterized in that: A groove (3) is provided inside the housing (1), a rubber pad (4) is fixedly connected to the inside of the groove (3), a notch (5) is provided inside the rubber pad (4), a polytetrafluoroethylene sealing ring (6) is fixedly connected to the inside of the notch (5), springs (7) are fixedly connected to the inside of the groove (3), and a lubrication mechanism (2) is provided on the right side of the top of the housing (1).

2. A stepped composite seal for reciprocating motion capable of compensating radial runout according to claim 1, characterized in that: The lubricating mechanism (2) comprises an oil inlet pipe (202), the bottom end of the oil inlet pipe (202) being fixedly connected to the right side of the top of the housing (1), a round hole (201) being provided on the right side of the top of the housing (1), a fixing column (203) being connected to the inner thread of the oil inlet pipe (202), an oil storage bar (204) being fixedly connected to the inner top of the groove (3), and a plurality of oil outlet holes (205) being provided on all sides of the inner periphery of the oil storage bar (204).

3. The stepped composite seal for reciprocating motion capable of compensating radial runout according to claim 1, characterized in that: A shock-absorbing ring (8) is fixedly connected to the outer wall of the housing (1), and a plurality of friction columns (9) are fixedly connected around the outer wall of the shock-absorbing ring (8).

4. A stepped composite seal for reciprocating motion capable of compensating radial runout according to claim 3, characterized in that: A plurality of anti-slip pads (10) are fixedly connected to the outer wall of the shock-absorbing ring (8) around four sides, and the plurality of anti-slip pads (10) are all of smooth design.

5. The stepped composite seal for reciprocating motion capable of compensating radial runout according to claim 2, characterized in that: The top of the fixed column (203) is fixedly connected to a rotating block (11), and the rotating block (11) is hexagonal in shape.

6. The stepped composite seal for reciprocating motion capable of compensating radial runout according to claim 1, characterized in that: A circular groove (12) is provided on the top of the rubber pad (4), and a sealing ring (13) is fixedly connected to the inside of the circular groove (12).

7. The stepped composite seal for reciprocating motion capable of compensating radial runout according to claim 1, characterized in that: The diameters of the notch (5) and the tetrafluoroethylene sealing ring (6) are equal, and the tetrafluoroethylene sealing ring (6) can be engaged inside the notch (5).

8. The stepped composite seal for reciprocating motion capable of compensating radial runout according to claim 1, characterized in that: The rear ends of the plurality of springs (7) are equidistantly surrounded inside the groove (3), and the front ends of the plurality of springs (7) are fixedly connected to the outer wall of the rubber pad (4).

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