CN213808865U - Mechanical shaft sealing element - Google Patents
Mechanical shaft sealing element Download PDFInfo
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- CN213808865U CN213808865U CN202022261163.9U CN202022261163U CN213808865U CN 213808865 U CN213808865 U CN 213808865U CN 202022261163 U CN202022261163 U CN 202022261163U CN 213808865 U CN213808865 U CN 213808865U
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- sealing
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Abstract
The utility model belongs to the technical field of the sealing member technique and specifically relates to a mechanical shaft sealing member is related to. The utility model provides a mechanical shaft seal spare, is including being annular shell, the inner wall of shell on be provided with two at least interior seal assemblies along axial direction, interior seal assembly including first pressure piece, first sealing ring, second pressure piece and the second sealing ring that cooperates the setting in proper order, one side of being close to first sealing ring of first pressure piece be provided with the spring slot, the spring slot in be provided with and be used for to the V type spring on first sealing ring. The utility model discloses difficult production is revealed, and the routine maintenance is changed conveniently, and antifriction nature is stronger, also can normally work under oil-free or few oily state, also can normal use under the conditions such as corruption, acid-base or high-speed rotation.
Description
Technical Field
The utility model belongs to the technical field of the sealing member technique and specifically relates to a mechanical shaft sealing member is related to.
Background
The traditional mechanical shaft sealing element generally adopts a rubber oil seal, but the contact area between a sharp lip tightly pressed by a spring and a mechanical shaft of the rubber oil seal is only 0.3-0.5mm, and the rubber oil seal is sensitive to the eccentricity of the mechanical shaft and is easy to leak; the bearable pressure of the rubber oil seal is only 0.03Mpa, and in order to be suitable for the deep water high-pressure environment, the pressure resistance of the sealing element needs to be improved by a method of adding the rubber oil seal, so that the routine maintenance and replacement procedures are complicated; the rubber oil seal has weak friction resistance, and cannot work or is easy to damage under an oil-free or less-oil state; is not suitable for use under the conditions of corrosion, acid-base or high-speed rotation and the like.
For example, Chinese patent publication numbers are: CN205841757U, a rubber oil seal with disassembly hole that announces in 2016 12, 28, including the installation shell, the installation axle, the rubber body, supporting framework and spring, supporting framework is located the rubber body, the rubber body outside forms outer seal face with installation shell interference contact, the inboard has the annular seal lip of cover on installation epaxial, the seal lip back is equipped with the spring groove, the spring housing is on the spring groove, the spring compresses tightly the seal lip, make seal lip and installation axle interference contact form the interior sealing surface, interior sealing surface and outer seal face form the working face of rubber body, the terminal surface recess has on the non-working face of rubber body bottom, the disassembly hole has on the supporting framework at terminal surface recess back. Although the problem that the existing rubber oil seal is damaged integrally after being detached is solved, the rubber oil seal is sensitive to the eccentricity of a mechanical shaft, is easy to leak, is complex in routine maintenance and replacement procedures, is weak in friction resistance, cannot work or is easy to damage in an oil-free or oil-less state, and is not suitable for being used under the conditions of corrosion, acid-base or high-speed rotation and the like.
Disclosure of Invention
The utility model discloses mainly be sensitive to the off-centre of current rubber oil blanket to the mechanical axis, easily produce and leak, the routine maintenance, it is complicated to change the process, antifriction nature is relatively weak, oilless or very easily harm can't work under the few oily state, the problem that the discomfort was used under the condition such as corruption, acid-base or high-speed rotation, it reveals to provide a difficult production, the routine maintenance is changed conveniently, antifriction nature is stronger, also can normally work under oilless or few oily state, at corruption, also can normally use mechanical axis sealing member under the condition such as acid-base or high-speed rotation.
The purpose of the utility model is mainly realized by the following scheme: the utility model provides a mechanical shaft seal spare, is including being annular shell, the inner wall of shell on be provided with two at least interior seal assemblies along axial direction, interior seal assembly including first pressure piece, first sealing ring, second pressure piece and the second sealing ring that cooperates the setting in proper order, one side of being close to first sealing ring of first pressure piece be provided with the spring slot, the spring slot in be provided with and be used for to the V type spring on first sealing ring. At least two inner sealing components are arranged on the inner wall of the shell along the axial direction, each inner sealing component comprises a first pressure block, a first sealing ring, a second pressure block and a second sealing ring which are sequentially matched, a spring groove is formed in one side, close to the first sealing ring, of each first pressure block, a V-shaped spring is arranged in the spring groove and used for abutting against the first sealing ring, the first pressure blocks of the two inner sealing components are respectively arranged at two ends of the shell, the V-shaped springs adopt existing spring parts and can abut against the first sealing ring and play a role in stably and effectively supporting the first sealing ring, the possibility that the first sealing ring is weak in sealing performance after being heated due to friction can be reduced, the second sealing ring can share the pressure on the first sealing ring, the service life of the first sealing ring is prolonged, and the whole sealing element can have a long-time stable sealing effect, the oil-free oil-.
Preferably, the first sealing ring is provided with a thread groove on the side contacting with the mechanical shaft. The first sealing ring is provided with a thread groove on one side contacted with the mechanical shaft, the rotation direction of the thread groove is opposite to the rotation direction of the mechanical shaft, inward thrust can be generated when the mechanical shaft rotates, fluid outflow is prevented, the thrust is high, the normal pressure of 3.0Mpa and 10Mpa fluid in a short time can be sealed, leakage can be prevented, the rubber oil seal can only seal the pressure of 0.03Mpa fluid, and the friction area can be reduced by arranging the thread groove, so that friction temperature rise is reduced.
Preferably, a plurality of outer mounting grooves are formed on the outer surface of the housing. Be provided with a plurality of outer mounting grooves on the surface of shell, can install sealing part such as backing ring, O type circle in the outer mounting groove to can guarantee the sealing performance of the surface department of shell.
Preferably, the first sealing ring and the second sealing ring are both made of polytetrafluoroethylene. The first sealing ring and the second sealing ring are made of polytetrafluoroethylene, the polytetrafluoroethylene has excellent anti-friction performance, and is particularly suitable for working in an oil-free or oil-less state, and the sealing ring can immediately have low-friction performance even being used again after being stopped for a long time, and is particularly suitable for high-speed rotation application, and the speed can reach 30 m/s.
Preferably, the housing is made of stainless steel material. The shell is made of stainless steel materials, and has good compression resistance and long service life.
Preferably, the length of the contact surface between the first sealing ring and the mechanical shaft and the contact surface between the second sealing ring and the mechanical shaft are 5-7 mm. The length of the contact surface between the first sealing ring and the mechanical shaft and the length of the contact surface between the second sealing ring and the mechanical shaft are 5-7mm, an enough oil film can be kept, the mechanical shaft is insensitive to eccentricity, and the mechanical shaft can normally work under the working condition that the radial runout of the mechanical shaft is 0.4 mm.
Preferably, the first pressure block and the second pressure block are both made of stainless steel materials. The first pressure block and the second pressure block are made of stainless steel materials, can bear the pressure of 2.5-20Mpa, and have strong pressure resistance.
Therefore, the utility model discloses a mechanical shaft seal spare possesses following advantage: the utility model discloses simple structure, convenient to use is difficult for producing at the during operation and reveals, and it is convenient that the daily maintenance is changed, and antifriction nature is stronger, also can normally work under oil-free or few oily state, also can normally use under conditions such as corruption, acid-base or high-speed rotation, long service life.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a side view of the present invention.
Fig. 3 is a front view of the present invention.
Fig. 4 is a cross-sectional view taken at a-a in fig. 3.
Fig. 5 is an enlarged view at B in fig. 4.
Fig. 6 is a schematic structural view of the expansion sealing device of the present invention.
Illustration of the drawings: the air guide structure comprises a shell 1, an outer mounting groove 2, a first pressure block 3, a first sealing ring 4, a second sealing ring 5, a second pressure block 6, an auxiliary pressure block 7, a spring groove 8, an air guide channel 9, a thread groove 10, an air guide strip 11, a first annular air bag 12, a second annular air bag 13 and a V-shaped spring 14.
Detailed Description
The technical solution of the present invention is further specifically described below by way of examples and with reference to the accompanying drawings.
Example 1:
as shown in fig. 1, 2, 3, 4, 5, a mechanical shaft seal comprises an annular housing 1, the housing 1 is made of stainless steel material, the pressure resistance is good, the service life is long, at least two inner seal assemblies are arranged on the inner wall of the housing 1 along the axial direction, each inner seal assembly comprises a first pressure block 3, a first seal ring 4, a second pressure block 6 and a second seal ring 5 which are arranged in a matching manner in sequence, a spring groove 8 is arranged on one side of the first pressure block 3 close to the first seal ring 4, a V-shaped spring 14 for abutting against the first seal ring 4 is arranged in the spring groove 8, the first pressure blocks 3 of the two inner seal assemblies are respectively arranged at two ends of the housing 1, the V-shaped spring 14 is an existing spring component, the V-shaped spring 14 abuts against the first seal ring 4 and plays a stable and effective supporting role for the first seal ring 4, the possibility that the sealing performance of the first sealing ring 4 is weak after the temperature is raised due to friction can be reduced, and the second sealing ring 5 can share the pressure on the first sealing ring 4, so that the service life of the first sealing ring 4 is prolonged, the whole sealing element can have a long-time stable sealing effect, is not easy to leak, is convenient and quick to maintain and replace in daily life, has strong friction resistance, can normally work under an oil-free or oil-less state, and can also be normally used under the conditions of corrosion, acid-base or high-speed rotation and the like; in this embodiment, the number of the inner seal assemblies arranged in the housing 1 is 3, wherein an auxiliary pressure block 7 is arranged between two adjacent second seal rings 5 in a matching manner, so that the stability of the whole seal is better.
The first sealing ring 4 is provided with a thread groove 10 on one side contacting with the mechanical shaft, the rotation direction of the thread groove 10 is opposite to the rotation direction of the mechanical shaft, when the mechanical shaft rotates, an inward thrust can be generated to prevent the fluid from flowing outwards, the thrust is high, the pressure of the fluid of 3.0Mpa and 10Mpa in a short time under a normal state can be sealed, the leakage can be prevented, the rubber oil seal can only seal the pressure of the fluid of 0.03Mpa, and the friction area can be reduced by arranging the thread groove 10, so that the friction temperature rise is reduced.
Be provided with a plurality of outer mounting grooves 2 on the surface of shell 1, can install sealing part such as backing ring, O type circle in outer mounting groove 2 to can guarantee the sealing performance of the surface department of shell 1.
The first sealing ring 4 and the second sealing ring 5 are made of polytetrafluoroethylene, the polytetrafluoroethylene has excellent anti-friction performance, and is particularly suitable for working in an oil-free or oil-less state, and the sealing ring can immediately have low friction performance even if being used again after being stopped for a long time, and is particularly suitable for high-speed rotation application, and the speed can reach 30 m/s.
The length of the contact surface between the first sealing ring 4 and the second sealing ring 5 and the mechanical shaft is 5-7mm, an enough oil film can be kept, the sealing device is insensitive to the eccentricity of the mechanical shaft, and the sealing device can normally work under the working condition that the radial runout of the mechanical shaft is 0.4 mm.
The first pressure block 3 and the second pressure block 6 are both made of stainless steel materials, can bear the pressure of 2.5-20Mpa, and have strong pressure resistance.
As shown in fig. 6, the inner sealing assembly further includes an expansion sealing device, the expansion sealing device includes a first annular air bag 12 disposed between the first sealing ring 4 and the first pressure block 3 and a second annular air bag 13 disposed between the second sealing ring 5 and the second pressure block 6, the first annular air bag 12 and the second annular air bag 13 are connected through a plurality of air guide strips 11, air guide channels 9 matched with the air guide strips 11 are disposed on the first sealing ring 4 and the second pressure block 6, when the pressure applied on the first sealing ring 4 is relatively large, the first sealing ring 4 is pressed on the first annular air bag 12 after being pressed, so that the gas in the first annular air bag 12 is pressed into the second annular air bag 13 through the air guide strips 11 after being compressed, so that the second annular air bag 13 is expanded and then pressed on the second sealing ring 5, the first annular air bag 12 can perform a relatively good supporting function on the first sealing ring 4 on one hand, prevent that the deformation that first sealing ring 4 takes place is too big, and on the other hand can be after second annular gasbag 13 atress inflation, second annular gasbag 13 supports tightly on second sealing ring 5 to make second sealing ring 5 can bear the bigger pressure that the transmission came on the mechanical axis, thereby share the pressure on first sealing ring 4 better, further improved the life of first sealing ring 4.
The quantity of the air guide strips 11 arranged on one expansion sealing device is 4, the 4 air guide strips 11 are arranged between the first annular air bag 12 and the second annular air bag 13 at intervals along the annular direction, the structural design is reasonable, and therefore the expansion sealing device can play a comprehensive and effective role.
It should be understood that this example is for illustrative purposes only and is not intended to limit the scope of the present invention. Furthermore, it should be understood that various changes and modifications of the present invention may be made by those skilled in the art after reading the teachings of the present invention, and these equivalents also fall within the scope of the appended claims.
Claims (7)
1. The utility model provides a mechanical shaft seal spare, is including being annular shell, its characterized in that, the inner wall of shell on be provided with two at least interior seal assemblies along axial direction, interior seal assembly including first pressure piece, first sealing ring, second pressure piece and the second sealing ring that cooperates the setting in proper order, one side that is close to first sealing ring of first pressure piece be provided with the spring slot, the spring slot in be provided with and be used for to support the V type spring on first sealing ring.
2. A mechanical shaft seal according to claim 1, wherein the first seal ring is provided with a threaded groove on the side contacting the mechanical shaft.
3. A mechanical shaft seal according to claim 1 wherein a plurality of outer mounting grooves are provided on the outer surface of said housing.
4. A mechanical shaft seal according to claim 1, 2 or 3, wherein said first and second seal rings are each made of polytetrafluoroethylene.
5. A mechanical shaft seal according to claim 1, 2 or 3 wherein said housing is made of stainless steel.
6. A mechanical shaft seal according to claim 1, 2 or 3, wherein the length of the contact surface between the first and second seal rings and the mechanical shaft is 5-7 mm.
7. A mechanical shaft seal according to claim 1, 2 or 3, wherein said first pressure block and said second pressure block are made of stainless steel material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022261163.9U CN213808865U (en) | 2020-10-12 | 2020-10-12 | Mechanical shaft sealing element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022261163.9U CN213808865U (en) | 2020-10-12 | 2020-10-12 | Mechanical shaft sealing element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213808865U true CN213808865U (en) | 2021-07-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022261163.9U Active CN213808865U (en) | 2020-10-12 | 2020-10-12 | Mechanical shaft sealing element |
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|---|---|
| CN (1) | CN213808865U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112212007A (en) * | 2020-10-12 | 2021-01-12 | 上海斯晏尔机电设备有限公司 | Underwater mechanical shaft sealing element |
-
2020
- 2020-10-12 CN CN202022261163.9U patent/CN213808865U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112212007A (en) * | 2020-10-12 | 2021-01-12 | 上海斯晏尔机电设备有限公司 | Underwater mechanical shaft sealing element |
| CN112212007B (en) * | 2020-10-12 | 2022-10-14 | 上海斯晏尔机电设备有限公司 | Underwater mechanical shaft sealing element |
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