CN114321378A - Low-leakage high-flow-resistance built-in channel alloy cast iron elastic sealing structure - Google Patents
Low-leakage high-flow-resistance built-in channel alloy cast iron elastic sealing structure Download PDFInfo
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- CN114321378A CN114321378A CN202111670834.XA CN202111670834A CN114321378A CN 114321378 A CN114321378 A CN 114321378A CN 202111670834 A CN202111670834 A CN 202111670834A CN 114321378 A CN114321378 A CN 114321378A
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- 238000007789 sealing Methods 0.000 title claims abstract description 144
- 229910001018 Cast iron Inorganic materials 0.000 title claims abstract description 25
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 25
- 239000000956 alloy Substances 0.000 title claims abstract description 25
- 230000001419 dependent effect Effects 0.000 claims 1
- 239000012530 fluid Substances 0.000 abstract description 22
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 abstract description 5
- 230000002035 prolonged effect Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 3
- 239000007788 liquid Substances 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 3
- 238000007142 ring opening reaction Methods 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000004080 punching Methods 0.000 description 1
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Abstract
The method of increasing the leakage amount on the end face of the elastic sealing ring made of alloy cast iron to reduce the temperature of the end face of the sealing ring by slotting has been proposed, and the traditional straight slot can significantly reduce the temperature of the end face of the sealing ring but can cause the leakage amount to be greatly increased so as to exceed the allowable range of the leakage amount. Therefore, the invention discloses an alloy cast iron elastic sealing structure with low leakage, high flow resistance and built-in channel, which comprises a built-in channel inside an alloy cast iron elastic sealing ring and a chromium-plated sealing ring end face. The invention utilizes the characteristic that the flow resistance can be effectively increased due to the long flow path of the built-in channel in the sealing ring to reduce the leakage amount of the sealing ring, and because the built-in channel is positioned in the sealing ring, the fluid flowing through the built-in channel can take away part of the heat of the sealing ring, thereby obviously reducing the temperature of the sealing ring and prolonging the service life of the sealing ring. In addition, the hardness and the wear resistance of the end face of the sealing ring can be improved after the end face of the sealing ring is plated with chrome, so that the service life of the sealing ring is further prolonged.
Description
Technical Field
The invention is applied to a rotary sealing structure in a transmission device.
Background
The transmission device is widely applied to the fields of aerospace, aviation, machinery, vehicles and the like, and a rotary sealing structure in the transmission device is usually applied to an alloy cast iron elastic sealing ring. Under the action of oil pressure, the alloy cast iron elastic sealing ring is tightly attached to the inner wall surface of the shaft groove, a very thin liquid film is reserved between the alloy cast iron elastic sealing ring and the inner wall surface of the shaft groove, and the surface where the liquid film is located is generally called a main sealing surface. Under the action of the elastic force of the sealing ring, the outer surface of the alloy cast iron elastic sealing ring is attached to the inner surface of the shaft sleeve, and the contact surface is called a second sealing surface. Although the leakage quantity of the main sealing surface is small, the end face of the sealing ring can rub with the shaft groove to generate large heat, so that the temperature of the sealing ring rises rapidly, the performance of the sealing ring is affected, and the service life of the sealing ring is further shortened. In order to ensure the service life of the alloy cast iron elastic sealing ring, the temperature of the sealing ring must be reduced.
In order to reduce the temperature of the sealing ring, a method of punching holes in the sealing ring and adding built-in channels can be adopted. Thereby punch in the sealing ring inside and increase built-in passageway and can show and increase flow path and effectively increase flow resistance, and then show the leakage quantity that leaks that reduces the sealing ring, and because built-in passageway is located the sealing ring inside, the partly heat of sealing ring itself can be taken away to the fluid that flows through built-in passageway, effectively reduces the temperature of sealing ring to the life-span of extension sealing ring.
Disclosure of Invention
The invention aims to design an alloy cast iron elastic sealing structure capable of reducing the leakage amount and the temperature of a sealing ring to the maximum extent.
The purpose of the invention is realized as follows:
the invention provides an alloy cast iron elastic sealing structure with low leakage, high flow resistance and a built-in channel, which is characterized in that: the alloy cast iron elastic sealing ring is internally provided with a channel and a chromium-plated sealing ring end face. Wherein the inside built-in passageway of alloy cast iron elastic sealing ring has showing and has increased flow path to improve the flow resistance of fluid, and then showing and reducing the leakage quantity of sealing ring, and because built-in passageway is located inside the sealing ring, the heat that some sealing ring itself produced because of the friction can be taken away to the fluid that flows through built-in passageway, effectively reduces the holistic temperature of sealing ring, thereby the life-span of extension sealing ring. After the end face of the sealing ring is plated with chrome, the hardness and the wear resistance of the sealing ring can be improved, so that the service life of the sealing ring is further prolonged.
The invention may also include such features:
1. diameter d of the built-in channel3Maximum 1/3 for the axial thickness of the seal ring.
2. The minimum number of the built-in channels is 1, and the maximum number can be determined according to the diameter d of the built-in channels3And (4) determining.
3. Diameter d of the centerline of the built-in channel2The diameter d of the outermost end of the sealing ring and the diameter d of the innermost end of the sealing ring1Half of the sum.
4. The built-in channel extends from one end of the sealing ring flap along the center line thereof to the other end of the sealing ring flap.
5. The distance between the starting point of one end of the built-in channel on the lap and the end point of the built-in channel on the other end is half of the axial thickness of the sealing ring, and the distances between the starting point and the end point of the built-in channel and the axial end face of the sealing ring are quarter of the axial thickness of the sealing ring.
The invention has the advantages that:
according to the invention, on the basis of the problem that the service life is influenced by the high temperature of the friction end surface of the alloy cast iron elastic sealing ring, the built-in channel is punched in the sealing ring, so that the leakage rate of the sealing ring is obviously reduced through the built-in channel, the flowing time of fluid on the sealing ring is increased to take away more heat, and the temperature of the sealing ring is further reduced to prolong the service life of the sealing ring; the main advantages of designing a built-in channel are represented by: 1. compared with the traditional straight groove flowing, the leakage amount is greatly increased due to the fact that fluid can directly flow out, the fluid cannot directly flow out when the built-in channel is adopted and flows inside the sealing ring along the built-in channel, and therefore leakage amount is remarkably reduced 2. when the fluid flows in the built-in channel, part of heat generated due to friction can be taken away, the temperature of the sealing ring is reduced, the service life of the sealing ring is effectively reduced, and 3. after the end face of the sealing ring is plated with chrome, the hardness and the wear resistance of the sealing ring can be improved, and therefore the service life of the sealing ring is further prolonged. Above-mentioned design can show not only that to reduce the leakage quantity of sealing ring, can also effectively reduce the temperature of sealing ring, can improve the wearability of sealing ring terminal surface moreover, and then prolonged the life-span of sealing ring.
Drawings
FIG. 1 shows the working principle of the alloy cast iron elastic sealing ring;
FIG. 2 is an elastic sealing structure of low-leakage high-flow-resistance built-in channel alloy cast iron;
FIG. 3 compares the results;
Detailed Description
The invention will now be described in more detail by way of example with reference to the accompanying drawings in which:
with reference to FIGS. 1-2, P1Is the high pressure side, P2On the low-pressure side, under the action of pressure difference, the alloy cast iron elastic sealing ring 3 can be tightly attached to the inner wall surface of the shaft groove 2, a very thin liquid film is left between the alloy cast iron elastic sealing ring and the inner wall surface, and the surface where the alloy cast iron elastic sealing ring is located is generally called as a main sealing surface, namely the position where the sealing ring end surface 4 is located. And under the action of the elastic force of the sealing ring 3 itself, the outer surface thereof will abut against the inner surface of the sleeve 1, this contact surface being referred to as the second sealing surface. When shaft groove 2 rotated, sealing ring terminal surface 4 can rub with shaft groove 2, produced a large amount of heat for 4 temperatures of sealing ring terminal surface rise significantly, and can reach sealing ring 3 and shaft groove 2 with heat transfer, make the two temperature also have obvious rising, and when fluid flowed through sealing ring terminal surface 4, can take away partly heat, reduce its temperature. The built-in channel 6 is from one end of the sealing ring joint 5 to the other end of the sealing ring joint 5 along the central line thereof, therefore, when the fluid passes through the joint 5, a part of the fluid flows into the built-in channel 6, because the built-in channel 6 increases the flow path, thereby improving the flow resistance of the fluid, further effectively reducing the leakage amount of the sealing ring 3, and when the fluid flows in the built-in channel 6, most of the heat generated by the sealing ring 3 due to friction can be taken away, thereby reducing the temperature of the sealing ring 3, obviously reducing the temperature, achieving the purpose of prolonging the service life of the sealing ring 3, and the wear resistance of the sealing ring 3 after being chromed is improved, further improving the sealing performance of the sealing ring 3, and further improving the sealing performanceLife of the seal ring 3.
The technical idea of the invention is as follows:
fluid can follow the direct outflow of sealing ring innermost end to the sealing ring outermost end when flowing through traditional straight flute, showing and having increased and let out leakage quantity, consequently at the inside built-in passageway that increases of sealing ring, flow path has been increased, thereby the flow resistance of fluid has been improved, and then showing the leakage quantity that reduces the sealing ring, and fluid can take away partly because of the heat that the friction produced when flowing in built-in passageway, the temperature of sealing ring has effectively been reduced, reach the purpose that prolongs the sealing ring life-span, and its wear resistance of sealing ring obtains improving after the chromium plating, further improve the life-span of sealing ring.
As shown in FIG. 1, the elastic sealing ring made of alloy cast iron works as follows, wherein P is1Is the high pressure side of the fluid, P2The elastic sealing ring 3 is a low-pressure side of fluid, under the action of fluid pressure difference, the elastic sealing ring 3 is tightly attached to the inner wall surface of the shaft groove 2, a very thin liquid film is left between the elastic sealing ring and the inner wall surface, and the surface where the liquid film is located is called as a main sealing surface, namely the position of the end surface 4 of the sealing ring. And under the action of the elastic force of the sealing ring 3 itself, the outer surface thereof will abut against the inner surface of the sleeve 1, this contact surface being referred to as the second sealing surface. When shaft groove 2 rotated, sealing ring terminal surface 4 can rub with shaft groove 2, produced a large amount of heat for 4 temperatures of sealing ring terminal surface rise significantly, and can reach sealing ring 3 and shaft groove 2 with heat transfer, make the two temperature also have obvious rising, and when fluid flowed through sealing ring terminal surface 4, can take away partly heat, reduce the temperature of sealing ring terminal surface 4.
As shown in fig. 2, the elastic sealing structure of the alloy cast iron with low leakage and high flow resistance provided by the present invention mainly comprises two characteristics, firstly, a method for forming an internal channel by opening a hole in the sealing ring 3 is provided, that is, the flow resistance of the fluid is increased by increasing the flow path, so as to significantly reduce the leakage amount of the sealing ring 3, and a part of the heat generated by friction is taken away by the flow of the fluid in the internal channel 6, so as to reduce the temperature of the sealing ring 3. Diameter d of the built-in channel 631/3 being maximum of the axial thickness of the sealing ring 3, diameter d of the centre line of the built-in channel 62The diameter d of the outermost end of the sealing ring 3 and the diameter d of the innermost end of the sealing ring 31And half of the sum, the built-in channel 6 extends from one end of the sealing ring opening 5 to the other end of the sealing ring opening 5 along the central line of the sealing ring opening, the distance between the starting point and the end point of the built-in channel 6 at one end of the opening 5 and the end point at the other end is half of the axial thickness of the sealing ring 3, and the distances between the starting point and the end point of the built-in channel 6 and the axial end face of the sealing ring 3 are quarter of the axial thickness of the sealing ring 3. Secondly, because the sealing ring terminal surface 4 can rub with the shaft groove 2 and cause wearing and tearing, then chromium plating on sealing ring terminal surface 4 strengthens its wear resistance, improves the life-span of sealing ring 3.
As shown in FIG. 3, the leakage rate result of the low-leakage high-flow-resistance built-in channel alloy cast iron elastic sealing structure provided by the invention is obviously lower than that of a lap joint model without a built-in channel, compared with the lap joint model without the built-in channel, the leakage rate of the single-hole built-in channel can be reduced by 11.58% -17.93%, the temperature rise can be reduced by 6.84%, the leakage rate of the double-hole built-in channel can be reduced by 19.26% -41.47%, and the temperature rise can be reduced by 12.84%.
Claims (6)
1. The utility model provides a low built-in passageway alloy cast iron elastic sealing structure of high flow resistance that leaks which characterized in that:
-an internal channel inside the elastic sealing ring of alloy cast iron;
-a chrome-plated seal ring end face.
2. The built-in channel of claim 1, wherein the built-in channel has a diameter d3Maximum 1/3 for the axial thickness of the seal ring.
3. The built-in channel according to claim 1, characterized in that the number of built-in channels is a minimum of 1 and the maximum number is dependent on the diameter d of the built-in channel3And (4) determining.
4. The built-in channel of claim 1, wherein the diameter d of the built-in channel centerline2The diameter d and the density of the outermost end of the sealing ringDiameter d of innermost end of seal ring1Half of the sum.
5. The built-in channel according to claim 1, characterized in that the built-in channel is formed by one end of the sealing ring land along its center line up to the other end of the sealing ring land.
6. The built-in channel of claim 1, wherein the distance between the starting point of the built-in channel at one end on the land and the ending point on the other end is half the axial thickness of the seal ring, and the distance between the starting point and the ending point of the built-in channel and the axial end face of the seal ring is one quarter of the axial thickness of the seal ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111670834.XA CN114321378A (en) | 2021-12-31 | 2021-12-31 | Low-leakage high-flow-resistance built-in channel alloy cast iron elastic sealing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111670834.XA CN114321378A (en) | 2021-12-31 | 2021-12-31 | Low-leakage high-flow-resistance built-in channel alloy cast iron elastic sealing structure |
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| Publication Number | Publication Date |
|---|---|
| CN114321378A true CN114321378A (en) | 2022-04-12 |
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|---|---|---|---|
| CN202111670834.XA Pending CN114321378A (en) | 2021-12-31 | 2021-12-31 | Low-leakage high-flow-resistance built-in channel alloy cast iron elastic sealing structure |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2763639Y (en) * | 2005-01-19 | 2006-03-08 | 新乡化纤股份有限公司 | Irregular seal ring |
| CN101832391A (en) * | 2010-05-11 | 2010-09-15 | 华南理工大学 | Mechanical sealing device |
| CN202851941U (en) * | 2012-11-15 | 2013-04-03 | 中国核动力研究设计院 | Large-diameter alloy O-shaped seal ring |
| CN103646674A (en) * | 2013-11-27 | 2014-03-19 | 中科华核电技术研究院有限公司 | C-shaped sealing ring |
| CN206257357U (en) * | 2016-12-20 | 2017-06-16 | 浙江阀毕威阀门有限公司 | The valve flanges fire resistant seal structure of metallic O ring is installed |
| CN111649133A (en) * | 2020-06-03 | 2020-09-11 | 滨州双峰石墨密封材料有限公司 | Winding gasket |
| CN113719614A (en) * | 2021-09-15 | 2021-11-30 | 北京化工大学 | Low-leakage long-life interconnected channel alloy cast iron elastic sealing ring structure |
-
2021
- 2021-12-31 CN CN202111670834.XA patent/CN114321378A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2763639Y (en) * | 2005-01-19 | 2006-03-08 | 新乡化纤股份有限公司 | Irregular seal ring |
| CN101832391A (en) * | 2010-05-11 | 2010-09-15 | 华南理工大学 | Mechanical sealing device |
| CN202851941U (en) * | 2012-11-15 | 2013-04-03 | 中国核动力研究设计院 | Large-diameter alloy O-shaped seal ring |
| CN103646674A (en) * | 2013-11-27 | 2014-03-19 | 中科华核电技术研究院有限公司 | C-shaped sealing ring |
| CN206257357U (en) * | 2016-12-20 | 2017-06-16 | 浙江阀毕威阀门有限公司 | The valve flanges fire resistant seal structure of metallic O ring is installed |
| CN111649133A (en) * | 2020-06-03 | 2020-09-11 | 滨州双峰石墨密封材料有限公司 | Winding gasket |
| CN113719614A (en) * | 2021-09-15 | 2021-11-30 | 北京化工大学 | Low-leakage long-life interconnected channel alloy cast iron elastic sealing ring structure |
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Application publication date: 20220412 |