A rotary sealing device for sealing

Abstract

The present invention provides a rotary sealing device for sealing: a rotary sealing device for sealing, comprising a sealing component and a sealing component housing sleeved outside the sealing component, the sealing component comprising a first lip, a second lip, and a third sealing ring, a first lip pressure ring is provided between the first lip and the second lip, a second lip pressure ring is provided between the second lip and the third sealing ring, and the third sealing ring is a lip-shaped sealing ring; the present invention adopts a three-stage sealing form of double lip sealing and lip-shaped ring sealing, and adopts polytetrafluoroethylene material to prepare the above-mentioned sealing component to form an oil-free rotary sealing component with good sealing performance. During use, the self-lubricating property of the polytetrafluoroethylene material is utilized, and no lubricating oil needs to be added, and the material can be in contact with the material without contaminating the material, and the in-situ cleaning requirement is also met.

Description

Technical Field

[0001] The invention relates to the field of sealing components, in particular to a rotary sealing device for sealing. Background Art

[0002] "Rotary shaft seal" is referred to as "rotary seal". It is generally used for the end of the rotating shaft of various machines. It acts as a seal by applying uniformly distributed radial pressure to the shaft surface through the sealing lip (surface). Such products include rotary shaft oil seals, D-shaped seals, O-rings, etc. Traditional seals are generally made of rubber materials. When the seals of this structure are paired with the housing, their sealing effect is not easy to guarantee. The material is also easy to lose elasticity due to aging and deformation, so the service life is short and needs to be replaced frequently, affecting the operating efficiency of the equipment. In addition, if the sealing effect is not ideal, it is very easy to cause the lubricating medium of the lubrication system to leak or seep, especially in food and drug manufacturing equipment. The leakage of the lubricating medium will seriously endanger human health. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art and to provide a rotary sealing device for sealing.

[0004] The technical solution adopted by the present invention is as follows: A rotary sealing device for sealing, comprising a sealing component and a sealing component housing sleeved outside the sealing component, the sealing component comprising a first lip, a second lip, and a third sealing ring, a first lip pressure ring is provided between the first lip and the second lip, a second lip pressure ring is provided between the second lip and the third sealing ring, the third sealing ring is a lip-shaped sealing ring, the first lip, the second lip, and the third sealing ring are arranged in sequence from top to bottom, the lip openings of the first lip and the second lip are in the same direction, and the first lip and the second lip are both made of polytetrafluoroethylene material.

[0005] Preferably, the lip of the lip seal ring faces downward, and the lip seal ring comprises an annular connecting portion abutting against the second lip pressure ring, an inner ring portion and an outer ring portion respectively arranged at the inner periphery and outer periphery of the annular connecting portion, the inner ring portion and the outer ring portion are spaced apart by a certain distance, the outer peripheral wall of the outer ring portion abuts against the inner wall of the sealing component housing, the inner diameter of the inner ring portion is smaller than the inner diameter of the second lip pressure ring, the lower end of the inner ring portion is provided with a first annular protrusion located on the inner side of the lip, a second annular protrusion located below the first annular protrusion and smaller than the first annular protrusion, and a third annular protrusion located on one side of the shaft hole, the cross sections of the first annular protrusion and the second annular protrusion are semicircular, and the cross section of the third annular protrusion is triangular;

[0006] The annular connecting portion is provided with a third lip piece on one side of the shaft hole. The third lip piece is arranged obliquely upward, and the angle between the third lip piece and the annular connecting portion is less than degrees.

[0007] A deformation cavity is provided between the outer ring portion, the second lip pressure ring and the inner wall of the sealing component housing.

[0008] There are embedded grooves between the upper ends of the first lip pressure ring and the second lip pressure ring and the inner wall of the sealing component housing. The first sealing ring and the second sealing ring are respectively arranged in the embedded grooves on the first lip pressure ring and the second lip pressure ring. The first sealing ring and the second sealing ring are O-rings.

[0009] The inner sides of the first lip pressing ring and the second lip pressing ring are both provided with threads.

[0010] A groove is arranged on the outer side of the sealing component housing, and a fourth sealing ring is arranged in the groove.

[0011] The outer portion of the sealing component housing is sheathed with a protective sheath.

[0012] A slide rod is slidably mounted on the protective sleeve body, a tightening bracket is mounted on one end of the slide rod, the tightening bracket contacts the fourth sealing ring, a spring is sleeved on the slide rod, and two ends of the spring are respectively mounted on the tightening bracket and the protective sleeve body.

[0013] The protective sleeve body is provided with an anti-skid convex ring.

[0014] The beneficial effects of the present invention are as follows: a three-stage sealing form of double lip seal and rotary shaft lip ring seal is adopted to form an oil-free rotary sealing component with good sealing performance; during use, the self-lubricating property of polytetrafluoroethylene material is utilized, and no lubricating oil needs to be added; the component can contact with materials without contaminating the materials; and the in-situ cleaning requirements are also met; a tightening bracket is arranged on the outside of the fourth sealing ring, which can effectively prevent the fourth sealing ring from being deformed after a long period of use and the sealing effect from being deteriorated; the protective sleeve can effectively prevent the fourth sealing ring from contacting the outside and reducing its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the present invention.

[0016] Figure 1 This is an overall structural diagram of a rotary sealing device for sealing according to the present invention;

[0017] Figure 2 for Figure 1 A magnified image of position A in the middle;

[0018] Figure 3 for Figure 1 Enlarged view of position B in the middle;

[0019] Figure 4 A structural diagram of a fourth sealing ring of a rotary sealing device for sealing according to the present invention;

[0020] Figure 5 It is a partial three-dimensional structural diagram of a rotary sealing device for sealing of the present invention;

[0021] Figure 6 This is a structural diagram of a connection between a slide rod and a tightening bracket of a rotary sealing device for sealing according to the present invention;

[0022] Figure 7 This is a diagram of the supplementary connection structure of a sliding rod and a tightening bracket of a rotary sealing device for sealing of the present invention;

[0023] Figure 8 A structural diagram of a protective sleeve of a rotary sealing device for sealing according to the present invention;

[0024] In the figure, 11-first lip, 12-second lip, 2-sealing assembly housing, 31-first lip pressure ring, 32-second lip pressure ring, 4-first sealing ring, 5-second sealing ring, 6-lip sealing ring, 61-annular connecting portion, 62-inner ring portion, 621-first annular protrusion, 622-second annular protrusion, 623-third annular protrusion, 624-third lip, 63-outer ring portion, 64-deformation cavity, 7-fourth sealing ring, 8-axial hole, 91-protective sleeve, 92-anti-slip convex ring, 93-slide rod, 94-spring, 95-tightening bracket. DETAILED DESCRIPTION

[0025] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings.

[0026] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for distinguishing two non-identical entities with the same name or non-identical parameters. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. The subsequent embodiments will not explain this one by one.

[0027] The directions and positions mentioned in the present invention, such as "upper", "lower", "front", "back", "left", "right", "inside", "outside", "top", "bottom", "side", etc., are only for reference to the directions or positions of the drawings. Therefore, the directions and positions used are for explaining and understanding the present invention, but not for limiting the scope of protection of the present invention.

[0028] like Figure 1-8As shown, the present invention is a rotary sealing device for sealing, comprising a sealing component and a sealing component housing 2 sleeved outside the sealing component, the sealing component comprising a first lip 11, a second lip 12, and a third sealing ring, a first lip pressing ring 31 is provided between the first lip 11 and the second lip 12, a second lip pressing ring 32 is provided between the second lip 12 and the third sealing ring, the third sealing ring is a lip-shaped sealing ring 6, the first lip 11, the second lip 12, and the third sealing ring are arranged in sequence from top to bottom, the lip openings of the first lip 11 and the second lip 12 are in the same direction, and the first lip 11 and the second lip 12 are both made of polytetrafluoroethylene material.

[0029] The lip of the lip seal ring 6 faces downward, and the lip seal ring 6 includes an annular connecting portion 61 abutting against the second lip pressure ring 32, an inner ring portion 62 and an outer ring portion 63 respectively arranged on the inner and outer peripheries of the annular connecting portion 61, the inner ring portion 62 and the outer ring portion 63 are spaced apart by a certain distance, and the outer peripheral wall of the outer ring portion 63 abuts against the inner wall of the sealing component housing 2, the inner diameter of the inner ring portion 62 is smaller than the inner diameter of the second lip pressure ring 32, and the lower end of the inner ring portion 62 is provided with a first annular protrusion 621 located on the inner side of the lip, a second annular protrusion 622 located below the first annular protrusion 621 and smaller than the first annular protrusion 621, and a third annular protrusion 623 located on one side of the shaft hole 8, the cross-sections of the first annular protrusion 621 and the second annular protrusion 622 are semicircular, and the cross-section of the third annular protrusion 623 is triangular.

[0030] The annular connecting portion 61 is provided with a third lip 624 on one side of the shaft hole 8 . The third lip 624 is arranged to be inclined upward, and the angle between the third lip 624 and the annular connecting portion 61 is less than 90 degrees.

[0031] A deformation cavity 64 is provided between the outer ring portion 63 , the second lip pressure ring 32 and the inner wall of the sealing assembly housing 2 .

[0032] There are embedded grooves between the upper ends of the first lip pressure ring 31 and the second lip pressure ring 32 and the inner wall of the sealing component housing 2. The first sealing ring 4 and the second sealing ring 5 are respectively arranged in the embedded grooves on the first lip pressure ring 31 and the second lip pressure ring 32. The first sealing ring 4 and the second sealing ring 5 are O-rings.

[0033] The first lip pressing ring 31 and the second lip pressing ring 32 are both provided with threads on their inner sides.

[0034] A groove is arranged on the outer side of the sealing component housing 2, and a fourth sealing ring 7 is arranged in the groove.

[0035] A protective sleeve body 91 is sleeved on the outside of the sealing component housing 2, and a sliding rod 93 is slidably installed on the protective sleeve body 91. A tightening bracket 95 is installed at one end of the sliding rod 93, and the tightening bracket 95 is in contact with the fourth sealing ring 7. A spring 94 is sleeved on the sliding rod 93, and the two ends of the spring 94 are respectively installed on the tightening bracket 95 and the protective sleeve body 91. An anti-slip convex ring 92 is provided on the protective sleeve body 91.

[0036] The sealing component adopts a double-lip structure, which has a better sealing effect. The double-lip seal + rotary shaft seal three-way sealing form forms a rotary sealing component with good sealing performance. The lip piece is made of Rulon 641, an FDA-certified material, which has a long service life and is self-lubricating. Therefore, the sealing component does not need to add lubricating oil during use and can be in direct contact with the material without contaminating the material. A tightening bracket 95 is arranged on the outside of the fourth sealing ring 7, which can effectively prevent the fourth sealing ring 7 from deforming after a long period of use and the sealing effect from deteriorating. The protective sleeve 91 can effectively prevent the fourth sealing ring 7 from contacting the outside and reducing its service life.

[0037] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A rotary sealing device for sealing, characterized in that: The invention comprises a sealing component and a sealing component housing (2) sleeved outside the sealing component, wherein the sealing component comprises a first lip (11), a second lip (12), and a third sealing ring, wherein a first lip pressure ring (31) is arranged between the first lip (11) and the second lip (12), a second lip pressure ring (32) is arranged between the second lip (12) and the third sealing ring, and the third sealing ring is a lip-shaped sealing ring (6), wherein the first lip (11), the second lip (12), and the third sealing ring are arranged in sequence from top to bottom, the lip openings of the first lip (11) and the second lip (12) are in the same direction, and the first lip (11) and the second lip (12) are both made of polytetrafluoroethylene material; A groove is arranged on the outer side of the sealing component housing (2), a fourth sealing ring (7) is arranged in the groove, a protective sleeve (91) is sleeved on the outer side of the sealing component housing (2), a sliding rod (93) is slidably mounted on the protective sleeve (91), a tightening bracket (95) is mounted on one end of the sliding rod (93), the tightening bracket (95) is in contact with the fourth sealing ring (7), a spring (94) is sleeved on the sliding rod (93), and two ends of the spring (94) are respectively mounted on the tightening bracket (95) and the protective sleeve (91).

2. A rotary sealing device for sealing according to claim 1, characterized in that: The lip seal ring (6) has a lip opening facing downwards, and comprises an annular connection portion (61) abutting against the second lip pressure ring (32), an inner ring portion (62) and an outer ring portion (63) respectively arranged on the inner and outer peripheries of the annular connection portion (61), the inner ring portion (62) and the outer ring portion (63) being spaced apart by a certain distance, the outer peripheral wall of the outer ring portion (63) abutting against the inner wall of the sealing component housing (2), and the inner diameter of the inner ring portion (62) being smaller than that of the second lip pressure ring The inner diameter of the inner ring portion (32) is 0.1 mm, and the lower end of the inner ring portion (62) is provided with a first annular protrusion (621) located on the inner side of the lip, a second annular protrusion (622) located below the first annular protrusion (621) and smaller than the first annular protrusion (621), and a third annular protrusion (623) located on one side of the shaft hole (8), wherein the cross-sections of the first annular protrusion (621) and the second annular protrusion (622) are semicircular, and the cross-section of the third annular protrusion (623) is triangular.

3. A rotary sealing device for sealing according to claim 2, characterized in that: The annular connecting portion (61) is provided with a third lip (624) on one side of the shaft hole (8); the third lip (624) is arranged tilted upward, and the angle between the third lip (624) and the annular connecting portion (61) is less than 90 degrees.

4. A rotary sealing device for sealing according to claim 2, characterized in that: A deformation cavity (64) is provided between the outer ring portion (63), the second lip pressure ring (32) and the inner wall of the sealing component housing (2).

5. A rotary sealing device for sealing according to claim 1, characterized in that: An embedding groove is provided between the upper end of the first lip pressure ring (31) and the second lip pressure ring (32) and the inner wall of the sealing component housing (2); a first sealing ring (4) and a second sealing ring (5) are respectively provided in the embedding grooves on the first lip pressure ring (31) and the second lip pressure ring (32); the first sealing ring (4) and the second sealing ring (5) are O-type sealing rings.

6. A rotary sealing device for sealing according to claim 5, characterized in that: The first lip pressing ring (31) and the second lip pressing ring (32) are both provided with threads on their inner sides.

7. A rotary sealing device for sealing according to claim 1, characterized in that: The protective sleeve body (91) is provided with an anti-slip convex ring (92).

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