Shaft seal and method of forming

Abstract

The application provides a shaft seal, which comprises a solid shaft, a through hole, a horizontal strip and an outer sealing ring, the through hole is arranged on the solid shaft and the center line of the through hole is perpendicular to the center line of the solid shaft, the horizontal strip fills the through hole and is integrally formed with the outer sealing ring to limit the movement of the sealing ring, and the outer sealing ring is directly formed on the circumferential surface of the solid shaft; the application also provides a forming method of the shaft seal; the application can fix the sealing ring on the shaft while the sealing ring plays a sealing role, avoids the leakage caused by the disengagement of the sealing ring from the surface of the shaft due to the movement of the shaft, reduces the roughness processing requirement of the surface of the shaft, avoids the processing of the sealing installation groove on the shaft, avoids the installation of the sealing member and the shaft, avoids the scratching of the surface of the sealing member, avoids the interference fit between the sealing member and the shaft, and avoids the installation residual stress in the sealing member.

Description

Technical Field

[0001] The present invention relates to the field of shaft sealing structure and manufacturing, in particular to a shaft sealing and a molding method. Background Art

[0002] Shaft seals can achieve a sealing effect under interference installation conditions due to their elastic effect. They prevent internal leakage of media and external intrusion of foreign matter. They are widely used in aerospace, diving, navigation, petroleum and petrochemical and other fields.

[0003] However, current shaft seals can move after installation. Once the seal is squeezed out of the groove, its performance and service life will be reduced. In situations where the shaft moves at high speed and under high pressure, the seal often becomes misaligned with the installation position, or the seal separates from the sealed component, resulting in seal failure. In addition, existing seals require interference fit installation with the shaft. During installation, the seal is stretched and slid into the groove along the shaft surface. Because there are micro-peaks on the shaft surface, the sealing surface is often damaged, causing failure. This installation method also generates residual stress during installation. Traditional seals limit the further development of related equipment. In order to compensate for the shortcomings of existing shaft seals, it is necessary to develop a seal that can be used in situations where the shaft moves at high speed and under high pressure. Summary of the Invention

[0004] The object of the present invention is to provide a shaft seal and a forming method thereof, wherein the shaft seal still has good sealing performance under high-speed shaft movement and high-pressure conditions.

[0005] To achieve the above-mentioned purpose, the technical solution of the present invention is: a device including a solid shaft, a through hole, a horizontal bar and an outer sealing ring, wherein the through hole is arranged on the solid shaft and the center line of the through hole is perpendicular to the center line of the solid shaft, the horizontal bar fills the through hole, and the horizontal bar and the outer sealing ring are integrally formed to limit the movement of the sealing ring, and the outer sealing ring is directly formed on the circumferential surface of the solid shaft.

[0006] Preferably, the center line of the through hole intersects with the position where the solid shaft needs to be sealed, the edges of the two ends of the through hole located on the side wall of the solid shaft are covered by the outer sealing ring, and the boundary line of the through hole is surrounded by the surface contact area between the outer sealing ring and the solid shaft.

[0007] Preferably, the number of the through holes is equal to that of the horizontal bars and is no less than one.

[0008] Preferably, the cross-sectional shapes of the through holes and the horizontal bars include circle, semicircle, triangle, and quadrilateral.

[0009] Preferably, the cross-sectional shape of the outer sealing ring includes a semicircle, a triangle, or a quadrilateral.

[0010] Preferably, the material of the horizontal strip and the outer sealing ring is a material formed by molecular chain cross-linking reaction.

[0011] Preferably, the material of the horizontal strip and the outer sealing ring is rubber or resin.

[0012] The present invention also provides a shaft seal forming method, comprising the following steps:

[0013] Prepare an open-and-close mold. The size of the solid shaft mold cavity should be equal to the outer diameter of the solid shaft, and the size of the sealing ring mold cavity should be equal to the size of the outer sealing ring.

[0014] Processing a through hole on the solid shaft, wherein the center line of the through hole intersects with a position on the solid shaft that needs to be sealed;

[0015] The solid shaft is placed in an open-and-close mold, with the two ends of the through hole surrounded by the sealing ring mold cavity, that is, the boundary line of the through hole is surrounded by the sealing ring mold cavity; an uncrosslinked reaction polymer strip is placed in the through hole of the shaft and the sealing ring mold cavity;

[0016] Close the mold and heat to the reaction temperature for a certain period of time;

[0017] Open the mold and obtain the shaft seal;

[0018] Preferably, the cross-sectional shape of the processed through hole includes circle, semicircle, triangle, and quadrilateral, and the cross-sectional shape of the sealing ring mold cavity includes semicircle, triangle, and quadrilateral.

[0019] Preferably, the length of the uncrosslinked reactive polymer strip placed in the through hole is greater than the length of the through hole.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention can fix the elastomer on the shaft while it performs a sealing function, thereby preventing the sealing ring from separating from the surface of the shaft due to the movement of the shaft and causing leakage; the present invention can reduce the requirements for the processing of the roughness of the shaft surface, and there is no need to process a sealing installation groove on the shaft. The seal and the shaft are installation-free, and there will be no problems such as scratches on the seal surface. There is no need for an interference fit between the seal and the shaft, and there will be no installation residual stress inside the seal; the present invention is easy to produce and process, and can improve the efficiency of sealing production. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a cross-sectional schematic diagram of a shaft seal according to a first embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the structure of the horizontal bar and the outer sealing ring in accordance with an embodiment of the present invention;

[0024] Figure 3This is a flow chart of the shaft seal molding method of the present invention;

[0025] Figure 4 An opening and closing mold for forming a shaft seal according to the present invention;

[0026] Figure 5 This is a cross-sectional schematic diagram of a shaft seal according to a second embodiment of the present invention;

[0027] Figure 6 This is a schematic diagram of the structure of the horizontal bar and the outer sealing ring in embodiment 2 of the present invention.

[0028] In the figure: 1-solid shaft; 2-through hole; 201-first through hole; 202-second through hole; 3-cross bar; 301-first cross bar; 302-second cross bar; 4-outer sealing ring. DETAILED DESCRIPTION

[0029] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings.

[0030] The present invention provides a shaft seal, characterized in that it includes a solid shaft, a through hole, a horizontal bar, and an outer sealing ring. The through hole is provided on the solid shaft and the center line of the through hole is perpendicular to the center line of the solid shaft. The horizontal bar completely fills the through hole and is integrally formed with the outer sealing ring to limit the movement of the sealing ring. The outer sealing ring is directly formed on the circumferential surface of the solid shaft.

[0031] The center line of the through hole intersects with the position of the solid shaft that needs to be sealed, the edges of the two ends of the through hole located on the side wall of the solid shaft are covered by the outer sealing ring, and the boundary line of the through hole is surrounded by the surface contact area between the outer sealing ring and the solid shaft.

[0032] The number of the through holes and the horizontal bars is equal and not less than 1; the cross-sectional shapes of the through holes and the horizontal bars include circle, semicircle, triangle, and quadrilateral; the cross-sectional shapes of the outer sealing ring include semicircle, triangle, and quadrilateral.

[0033] The materials of the horizontal strip and the outer sealing ring include rubber, resin and other materials formed by molecular chain cross-linking reaction.

[0034] The present invention also provides a shaft seal forming method, comprising the following steps:

[0035] Prepare an open-and-close mold. The size of the solid shaft mold cavity should match the outer diameter of the solid shaft, and the size of the sealing ring mold cavity should match the size of the outer sealing ring.

[0036] Processing a through hole on the solid shaft, wherein the center line of the through hole intersects with a position on the solid shaft that needs to be sealed;

[0037] The solid shaft is placed in the open-and-close mold, and the two ends of the through hole are surrounded by the sealing ring mold cavity; that is, the boundary line of the through hole is surrounded by the sealing ring mold cavity, and an uncrosslinked reaction polymer strip is placed in the through hole of the solid shaft and the sealing ring mold cavity;

[0038] Close the mold and heat to the reaction temperature for a certain period of time;

[0039] The mold is opened to obtain the shaft seal.

[0040] The cross-sectional shapes of the processed through-holes include circle, semicircle, triangle and quadrilateral, and the cross-sectional shapes of the sealing ring mold cavity include semicircle, triangle and quadrilateral.

[0041] The length of the uncrosslinked reactive polymer strip placed into the through hole is greater than the length of the through hole.

[0042] In the above-mentioned shaft seal and shaft seal forming method, the types of solid shafts include but are not limited to equal-diameter shafts and stepped shafts; optionally, the solid shaft can be connected to other shafts.

[0043] Two specific embodiments are provided below;

[0044] Example 1

[0045] like Figure 1-2 As shown, a shaft seal includes a solid shaft 1, a through hole 2, a horizontal bar 3 and an outer sealing ring 4. The through hole 2 is on the solid shaft 1 and the center line of the through hole 2 is perpendicular to the center line of the solid shaft 1. The horizontal bar 3 fills the through hole 2. The horizontal bar 3 and the outer sealing ring 4 are integrally formed to limit the movement of the sealing ring 4. The outer sealing ring 4 is directly formed on the circumferential surface of the solid shaft 1.

[0046] Specifically, the cross-sectional shape of the through hole 2 and the horizontal bar 3 is circular, the number of the through hole 2 and the horizontal bar 3 is 1, the center line of the through hole 2 intersects with the position where the shaft needs to be sealed, the cross-sectional shape of the outer sealing ring 4 is semicircular, the diameter of the through hole 2 is smaller than the diameter of the outer sealing ring 4, and the material of the horizontal bar 3 and the outer sealing ring 4 is nitrile rubber.

[0047] A method for forming a shaft seal, such as Figure 3 As shown, it includes the following steps:

[0048] Prepare the split mold, such as Figure 4 As shown, the size of the solid shaft mold cavity is equivalent to the outer diameter of the solid shaft, and the size of the sealing ring mold cavity is equivalent to the size of the outer sealing ring;

[0049] A circular through hole is machined on a solid shaft of equal diameter, with the center line of the through hole intersecting with the position of the solid shaft that needs to be sealed;

[0050] Put the solid shaft into the mold, the boundary line of the through hole is surrounded by the sealing ring mold cavity, and put the uncrosslinked nitrile rubber strip into the through hole and mold cavity of the solid shaft;

[0051] Close the mold and heat to the reaction temperature of 160°C for 20 minutes;

[0052] The mold is opened to obtain the shaft seal.

[0053] The length of the uncrosslinked nitrile rubber strip placed in the through hole is greater than the length of the through hole.

[0054] Example 2:

[0055] like Figure 5-6 As shown, a shaft seal includes a solid shaft 1, a first cross-hole 201 and a second cross-hole 202, a first cross-bar 301, a second cross-bar 302 and an outer sealing ring 4, the first cross-hole 201 and the second cross-hole 202 are on the solid shaft 1 and the center lines of the first cross-hole 201 and the second cross-hole 202 are perpendicular to the center line of the solid shaft 1, the first cross-bar 301 fills the first cross-hole 201, and the second cross-bar 302 fills the second cross-hole 202. The first cross-bar 301, the second cross-bar 302 and the outer sealing ring 4 are integrally formed to limit the movement of the sealing ring 4, and the outer sealing ring 4 is directly formed on the circumferential surface of the solid shaft 1.

[0056] Specifically, the cross-sectional shape of the first through hole 201, the second through hole 202 and the first horizontal bar (301), the second horizontal bar (302) is a square, the center line of the first through hole (201) and the second through hole (202) intersects with the position where the shaft needs to be sealed, the cross-sectional shape of the outer sealing ring 4 is semicircular, the diameters of the first through hole 201 and the second through hole 202 are smaller than the diameter of the outer sealing ring 4, and the material of the horizontal bar 3 and the outer sealing ring 4 is fluororubber.

[0057] A method for forming a shaft seal includes the following steps:

[0058] Prepare an open-and-close mold. The size of the solid shaft mold cavity should be equal to the outer diameter of the solid shaft, and the size of the sealing ring mold cavity should be equal to the size of the outer sealing ring.

[0059] Two square through holes are machined on a solid shaft of equal diameter, with the center lines of the through holes intersecting with the position of the solid shaft that needs to be sealed;

[0060] Place the solid shaft into the mold, with the boundary line of the through hole surrounded by the sealing ring cavity, and place an uncrosslinked fluororubber strip in the through hole and cavity of the solid shaft;

[0061] Close the mold and heat to the reaction temperature of 175°C for 15 minutes;

[0062] The mold is opened to obtain the shaft seal.

[0063] The length of the uncross-linked fluororubber strip placed in the through hole is greater than the length of the through hole.

[0064] The above are preferred embodiments of the present invention. Any changes made according to the technical solution of the present invention, as long as the resulting functions and effects do not exceed the scope of the technical solution of the present invention, shall fall within the scope of protection of the present invention.

Claims

1. A method for forming a shaft seal, characterized in that: The shaft seal molding method comprises the following steps: Prepare an open-and-close mold. The size of the solid shaft mold cavity should be equal to the outer diameter of the solid shaft, and the size of the sealing ring mold cavity should be equal to the size of the outer sealing ring. Processing a through hole on the solid shaft, wherein the center line of the through hole intersects with a position on the solid shaft that needs to be sealed; The solid shaft is placed in an open-and-close mold, with the two ends of the through hole surrounded by the sealing ring mold cavity; uncrosslinked reaction polymer strips are placed in the through hole of the solid shaft and the sealing ring mold cavity; Close the mold and heat to the reaction temperature for a certain period of time; Open the mold and obtain the shaft seal; The obtained shaft seal includes a solid shaft, a through hole, a horizontal bar and an outer sealing ring. The through hole is arranged on the solid shaft and the center line of the through hole is perpendicular to the center line of the solid shaft. The horizontal bar fills the through hole, and the horizontal bar and the outer sealing ring are integrally formed to limit the movement of the sealing ring. The outer sealing ring is directly formed on the circumferential surface of the solid shaft.

2. A shaft seal forming method according to claim 1, characterized in that: The number of the through holes is equal to the number of the horizontal bars and is no less than one.

3. A method for forming a shaft seal according to claim 1, characterized in that: The cross-sectional shapes of the through holes and the horizontal bars include circle, semicircle, triangle and quadrilateral.

4. A method for forming a shaft seal according to claim 1, characterized in that: The cross-sectional shape of the outer sealing ring includes semicircle, triangle and quadrilateral.

5. A method for forming a shaft seal according to claim 1, characterized in that: The material of the horizontal strip and the outer sealing ring is rubber or resin.

6. A method for forming a shaft seal according to claim 1, characterized in that: The length of the uncrosslinked reactive polymer strip placed into the through hole is greater than the length of the through hole.

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