CN211288744U - Polytetrafluoroethylene guiding and sealing device - Google Patents
Polytetrafluoroethylene guiding and sealing device Download PDFInfo
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- CN211288744U CN211288744U CN201921299779.6U CN201921299779U CN211288744U CN 211288744 U CN211288744 U CN 211288744U CN 201921299779 U CN201921299779 U CN 201921299779U CN 211288744 U CN211288744 U CN 211288744U
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Abstract
The utility model discloses a polytetrafluoroethylene direction sealing device, this direction sealing device include sealing member and sealing washer, the sealing member includes first seal lip, second seal lip and is located the seal between first seal lip and the second seal lip, the sealing washer cover is established on the seal, works as the direction sealing device cover is established epaxial back, the sealing member inner wall forms airtight chamber with the outer wall of axle, and is little with this direction sealing device's area of contact at the axle, when the axle carries out reciprocating motion, the axle is little with this direction sealing device's area of friction, and the heat of production is few, has prolonged this direction sealing device's life and has guaranteed good leakproofness.
Description
Technical Field
The utility model relates to a sealing device, concretely relates to polytetrafluoroethylene direction sealing device.
Background
The sealing ring plays an important role in mechanical equipment for reciprocating motion of a hydraulic oil cylinder and the like, for example, the sealing ring is mainly used for sealing a piston and a piston rod of a reciprocating ultrahigh-pressure hydraulic oil cylinder.
The sealing ring on the existing market has thicker sealing lip, the contact surface between the sealing ring and a shaft is larger during use, more heat is generated, the heat is not easy to be dissipated in the sealing ring, the sealing ring is heated and deformed, the service life is shortened, the sealing ring is easy to damage, the air tightness is poorer, and the production efficiency and the machine performance are reduced.
SUMMERY OF THE UTILITY MODEL
In order to overcome the above problem, the inventor has carried out the research of keen interest, the utility model discloses a polytetrafluoroethylene direction sealing device, this direction sealing device include sealing member and sealing washer, the sealing member includes first seal lip, second seal lip and is located the seal between first seal lip and the second seal lip, the sealing washer cover is established on the seal, works as the direction sealing device cover is established epaxial back, the sealing member inner wall forms airtight chamber with the outer wall of axle, and is little with this direction sealing device's area of contact at the axle, and when the axle carries out reciprocating motion, the axle is little with this direction sealing device's frictional area, and the heat of production is few, has prolonged this direction sealing device's life and has guaranteed good leakproofness to accomplish the utility model discloses a sealed device is used to the heat of production.
An object of the utility model is to provide a polytetrafluoroethylene direction sealing device, sealing device includes sealing member and sealing washer, the sealing member includes first seal lip, second seal lip and is located the seal between first seal lip and the second seal lip, the sealing washer cover is established on the seal.
The two ends of the sealing body are respectively connected with the first sealing lip and the second sealing lip, one end, connected with the first sealing lip, of the sealing body is the upper end of the sealing body, one end, connected with the second sealing lip, of the sealing body is the lower end of the sealing body, and the inner diameter of the sealing body is smaller gradually in the axial direction from the upper end of the sealing body to the lower end of the sealing body.
The guide sealing device is of a hollow structure, a conical surface structure is formed on the inner wall of the sealing body, and a conical angle formed by the conical surface structure is 75-85 degrees.
The first sealing lip and the second sealing lip are both of hollow round cake-shaped structures, the outer wall of the sealing body forms a conical surface structure, the first sealing lip is located above the second sealing lip, and the axes of the first sealing lip, the second sealing lip and the sealing body coincide.
The inner walls of the first sealing lip and the second sealing lip are provided with at least one annular groove, a sealing ring is arranged in the annular groove, and the cross section of the sealing ring is circular.
The depth of the annular groove is not larger than the diameter of the cross section of the sealing ring, the width of the annular groove is equal to the diameter of the cross section of the sealing ring, more than two annular grooves are arranged on the inner wall of the first sealing lip, and the width and the depth of the annular groove are gradually reduced in the axial direction from the upper surface to the lower surface of the first sealing lip.
The first sealing lip is provided with a guide structure I, and the guide structure I is a conical surface structure I.
Wherein, the sealing washer is located the junction of sealing body and second seal lip.
The outer part of the joint of the sealing body and the second sealing lip is provided with an arc transition section, the cross section of the sealing ring is arc-shaped, and the outer wall of the sealing ring is tightly attached to the arc transition section.
The inner wall of the second sealing lip is provided with a guide structure II, the guide structure II is provided with a conical surface structure II, and the conical angle of the conical surface structure II is 75-85 degrees.
The inner diameter of the joint of the inner wall of the sealing body and the inner wall of the second sealing lip is equal to the inner diameter of the first sealing lip.
Wherein, the angle formed by the generatrix of the conical surface structure of the inner wall of the sealing body and the generatrix of the conical surface structure II of the guide structure II is 75-85 degrees.
The guiding sealing device is made of polytetrafluoroethylene materials and comprises a polytetrafluoroethylene layer.
The sealing element is of an integrally formed structure, the guiding and sealing device further comprises a fiber layer, and the fiber layer is located inside the polytetrafluoroethylene layer.
The utility model discloses the beneficial effect who has does:
(1) the polytetrafluoroethylene guide sealing device provided by the utility model has small contact area with the shaft and only contacts with part of the inner wall of the sealing element, so that when the shaft reciprocates, the heat generated by friction is small, and the deformation degree of the guide sealing device can be reduced;
(2) the guide sealing device provided by the utility model is provided with a guide structure I and a guide structure II, thereby facilitating the installation of other parts and the guide sealing device;
(3) in the guiding sealing device of the utility model, after the guiding sealing device is sleeved on the shaft, because the inner diameter of the sealing body is gradually reduced from top to bottom, the outer wall of the shaft and the inner wall of the sealing element form a sealed cavity which can be beneficial to the dissipation of the heat generated by the friction between the sealing device and the shaft, so that the thermal deformation degree of the guiding sealing device is small, and the service life of the guiding sealing device is prolonged;
(4) the sealing device and the shaft can be tightly attached by adopting the matching of the sealing element and the sealing ring, thereby achieving better sealing effect;
(5) the utility model provides a direction sealing device has direction and sealed effect concurrently, and simple structure, convenient operation have better practicality.
Drawings
Fig. 1 shows a schematic structural view of a guide seal device according to a preferred embodiment of the present invention;
FIG. 2 is a schematic view showing a cross-sectional structure taken along the line A-A of a preferred embodiment of the guide seal device of the present invention;
FIG. 3 is a schematic sectional view taken along the line A-A of the guide seal device according to another preferred embodiment of the present invention;
fig. 4 shows a schematic three-dimensional structure of a guide seal device according to a preferred embodiment of the present invention.
The reference numbers illustrate:
1-a first sealing lip;
11-guide construction I
2-sealing body;
3-a second sealing lip;
31-guide Structure II
4-sealing ring;
5-an arc transition section;
6-an annular groove;
7-sealing ring.
Detailed Description
The invention is explained in more detail below with reference to the drawings and preferred embodiments. The features and advantages of the present invention will become more apparent from the description.
The utility model discloses in, the sealed of polytetrafluoroethylene direction sealing device mainly used axle or piston rod etc..
According to the present invention, as shown in fig. 1-4, a ptfe guide seal device is provided, which comprises a seal member having an axisymmetric structure. The seal comprises a first sealing lip 1 and a second sealing lip 3 and a sealing body 2 located between the first sealing lip 1 and the second sealing lip 3.
According to the utility model discloses, the external diameter of first seal lip 1 is less than the external diameter of second seal lip 3.
According to the utility model discloses, the axis coincidence of first seal lip 1, second seal lip 3, seal and sealing washer, and with this direction sealing device's axis coincidence.
According to the utility model discloses, be equipped with guide structure I11 on the first seal lip 1, guide structure I11 is conical surface structure I, and this conical surface structure I's conical angle is 75 ~85, preferably 85.
According to the utility model discloses, the summit of the circular cone that extends the formation by this circular conical surface structure I is located the top of first seal lip, and this circular conical surface structure I's axis and the coincidence of the axis of first seal lip 1, this circular conical surface structure I's the axle section the radius by the axial direction of the upper surface of first seal lip 1 to lower surface on be crescent gradually.
The utility model discloses in, set up guide structure I11 on first seal lip, can be convenient for this direction sealing device embolias other parts smoothly.
According to the utility model discloses, the both ends of seal 2 are connected with first seal lip 1 and second seal lip 3 respectively, and the one end that seal 2 and first seal lip 1 are connected is the upper end of seal 2, and the one end that seal 2 and second seal lip 3 are connected is the lower extreme of seal 2, and the internal diameter of the upper end of seal 2 is greater than the internal diameter of the lower extreme of seal 2, and on the axial direction of the upper end of seal 2 to the lower extreme of seal 2, the internal diameter of seal 2 is less gradually.
According to the utility model discloses, seal 2 has the toper structure, and the inner wall of seal 2 forms the circular conical surface structure, and the circular conical angle of this circular conical surface structure is 75 ~85, preferably 85.
According to the utility model discloses, on the axle cross-section of seal 2, the cross-section of seal 2 is the ring form, by the axial direction of the upper end of seal 2 to the lower extreme of seal 2 on, the external diameter and the internal diameter in seal 2's cross-section all reduce gradually.
According to the utility model discloses, first seal lip 1 and second seal lip 3 are hollow cake column structure, and the outer wall of seal 2 forms the circular conical surface structure, and is axial symmetry and central symmetry structure, and wherein, first seal lip 1 is located the top of second seal lip 3, and seal 2 is located between first seal lip 1 and the second seal lip 3, the coincidence of the axis of first seal lip 1, second seal lip 3 and seal 2.
According to the utility model discloses preferred embodiment, all be equipped with at least one annular groove 6 on the inner wall of first seal lip 1 and second seal lip 3, be equipped with sealing ring 7 in the annular groove 6, sealing ring 7's cross section is circular.
According to the utility model discloses, the central line of annular groove 6 coincides with the central line of first seal lip 1 or second seal lip 3.
According to the utility model discloses, the internal diameter of packing into sealing ring 7 behind the annular groove 6 is not more than the external diameter of axle to make sealing ring 7 closely laminate with the axle, the leakproofness is good.
According to the present invention, the outer diameter of the sealing ring 7 is not smaller than the diameter of the annular groove 6. Preferably, the sealing ring 7 is fixed in the annular groove 6, so that the sealing ring 7 can be tightly fitted with the annular groove 6 without slipping off when the shaft or piston rod performs reciprocating motion.
According to a preferred embodiment of the invention, the cross section of the annular groove 6 is rectangular. The depth of the annular groove 6 is not larger than the diameter of the cross section of the sealing ring 7, the depth of the annular groove 6 is not smaller than the radius of the cross section of the sealing ring 7, so that the sealing ring 7 cannot slide out of the groove, the width of the annular groove 6 is equal to the diameter of the cross section of the sealing ring 7, after the guide sealing device is sleeved in the shaft, the shaft is in contact with the sealing ring, the friction area of the shaft is small, and the generated heat is less.
According to the utility model discloses, back in the annular groove 6 is packed into to sealing ring 7, the internal diameter of sealing ring 7 is not more than the internal diameter of first seal lip 1 or second seal lip 2 or the external diameter of axle to after the axis stretched into this direction seal device, the outer wall of axle and the inner wall contact of sealing ring, area of contact was little.
The utility model discloses in, sealing ring 7 in the annular groove 6 of the internal face of second seal lip 3 can closely laminate with the axle, plays better sealed effect to the axle, simultaneously, the firm degree of laminating of axle and sealing ring 7 can further be improved in the existence of sealing washer 4, and area of contact is little, and is sealed effectual.
According to the utility model discloses preferred embodiment, be equipped with more than two annular groove 6 on the inner wall of first seal lip 1, the width and the degree of depth of annular groove 6 are in the axial direction of the upper surface of first seal lip 1 to lower surface and reduce gradually, and the depth and the width of the annular groove that is close to the upper surface of first seal lip 1 are the biggest promptly to it is also the biggest between the cross section of the sealing ring of establishing to overlap on it, thereby makes the sealed effect of axle and first seal lip 1 better.
According to the utility model discloses, be equipped with guide structure II31 on the inner wall of second seal lip 3, guide structure II31 is extended towards the inside of seal 2 by the bottom of seal 2 to with the interior wall connection of seal 2.
According to the utility model discloses, guide structure II31 is conical surface structure II, conical surface structure II's circular cone angle is 75 ~85, preferably 85.
According to the utility model discloses, guide structure II 31's axis and the coincidence of the axis of second seal lip 31, guide structure II 31's conical surface is by being close to second seal lip 31 bottom to keeping away from the direction of sealing member bottom, and the internal diameter is the diminishing gradually. That is, the apex of the cone formed by the extension of the conical surface structure II is located above the second seal lip 31, the axis of the conical surface structure II coincides with the axis of the second seal lip 3, and the radius of the axial cross section of the conical surface structure II gradually increases in the axial direction from the upper surface to the lower surface of the second seal lip 1.
According to the utility model discloses, the internal diameter of the inner wall junction of seal 2 inner wall and second seal lip 3 equals with the internal diameter of first seal lip 1, and preferably, the junction of second seal lip 3 and seal 2 inner wall is guide structure II31 and seal 2's inner wall junction.
According to the utility model discloses, with this sealing member of plane intercepting through the sealing member axis, the gained section is two class Z shape sections about the sealing member axis symmetry.
According to the utility model discloses, this direction sealing device is hollow structure, and this direction sealing device can overlap and establish on axle or piston rod etc.. After the guide sealing device is sleeved on the shaft or the piston rod, the inner wall of the sealing element and the outer wall of the shaft form a sealed cavity, specifically, an opening of the first sealing lip 1 is tightly attached to the shaft, and the inner wall of the sealing body is connected with the second sealing lip and is tightly attached to the shaft, so that better sealing is realized for the shaft.
The utility model discloses in, when axis or piston rod carried out reciprocating motion, the area of contact of axis or piston rod and sealing member was little to airtight chamber also can play the thermal effect of effluvium friction, thereby makes this direction sealing device's the deformation degree of being heated little, long service life.
The utility model discloses in, axle or piston rod isotructure can stretch into the sealing member smoothly under guide structure II 31's guiding action, the installation of the axle of being convenient for or piston rod isotructure.
According to the utility model discloses, the angle that the generating line of seal 2 and the generating line of guide structure II31 become is 75 ~85, preferably 85.
According to the utility model discloses, still the cover is equipped with sealing washer 4 on seal 2, and this sealing washer 4 is located the junction of seal 2 and second seal lip. The cross section of the sealing ring 4 is circular arc, preferably, the sealing ring 4 is an O-shaped sealing ring, and the O-shaped sealing ring is preferably an O-shaped sealing ring with a circular cross section.
According to the utility model discloses, the junction of the outer wall of seal 2 and second seal lip 3 has arc changeover portion 5, and arc changeover portion 5 includes the arc chamfer, and sealing washer 4 is located arc changeover portion 5, and sealing washer 4 closely laminates with arc changeover portion 5.
The utility model discloses in, 4 covers of sealing washer are located on the arc changeover portion 5 for sealing washer 4 has the power at directional sealing washer 4 center to seal 2, and back in the sealing member is stretched into to pivot or piston rod etc. and the existence of sealing washer 4 can make the laminating of pivot or piston rod and sealing member inner wall inseparabler, makes sealed effect better.
And, the sealing washer cover is located arc changeover portion 5, also makes the position of sealing washer more stable.
According to the utility model discloses, the angle that the generating line of guide structure II31 becomes with the bottom surface of second seal lip 3 is 75 ~85, preferably 85.
According to the utility model discloses, the angle that the generating line of the conical surface structure of seal 2 and the generating line of guide structure II31 become is 75 ~85, preferably 85.
According to the utility model relates to a preferred embodiment, when adopting this direction sealing device to seal the piston rod, it is 300mm to establish the external diameter of piston rod, and the external diameter of first seal lip 1 is 320mm, and the internal diameter of first seal lip 1 is 296mm, and the external diameter of second seal lip is 294mm, and the thickness 12mm of first seal lip 1, the thickness 12mm of second seal lip, the height of sealing member is 80 mm.
According to the utility model, the sealing element is made of polytetrafluoroethylene.
According to the utility model relates to a preferred embodiment, this sealing member includes the polytetrafluoroethylene layer, still includes the fibrous layer, and the fibrous layer is located polytetrafluoroethylene in situ portion, and the fibrous layer can strengthen the mechanical strength of sealing member, and when the sealing member was heated, the fibrous layer can reduce the great coefficient of thermal expansion that causes owing to single polytetrafluoroethylene material.
According to the utility model discloses, the fibrous layer is preferably the glass fiber layer, and the glass fiber layer heat resistance is good, coefficient of thermal expansion is little, and increases polytetrafluoroethylene material's mechanical strength simultaneously.
The utility model discloses in, because the area of contact of piston rod and sealing member is little, the outer wall of piston rod and the inner wall contact of first seal lip still with the inner wall contact of sealing, can not contact with whole seal to the piston rod is when carrying out reciprocating motion, and the frictional force between piston rod and the sealing member is little, thereby the heat of production is few, thereby sealing device's life has been prolonged, and the leakproofness of sealing device and piston rod has been guaranteed. Meanwhile, when the piston rod extends into the sealing device to reciprocate, a sealed cavity is formed between the outer wall of the piston rod and the inner wall of the sealing body, heat generated by mutual friction between the piston rod and the sealing device can be dissipated out through the sealed cavity and the sealing body at any time, and thermal deformation of the sealing device is reduced, so that the service life of the sealing device is prolonged.
The utility model discloses in, establish the sealing washer through overlapping in the seal outside for the laminating of seal inner wall and piston rod outer wall is inseparabler, has guaranteed the good leakproofness of piston rod when reciprocating motion.
The utility model provides a direction sealing device has direction and sealed effect concurrently, and simple structure, convenient operation have better practicality.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", and the like indicate the position or positional relationship based on the operation state of the present invention, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the connection may be direct or indirect via an intermediate medium, and may be a communication between the two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The present invention has been described in detail with reference to the preferred embodiments and the exemplary embodiments. It should be noted, however, that these specific embodiments are only illustrative explanations of the present invention, and do not set any limit to the scope of the present invention. Without departing from the spirit and scope of the present invention, various modifications, equivalent replacements, or modifications may be made to the technical content and embodiments thereof, which all fall within the scope of the present invention. The protection scope of the present invention is subject to the appended claims.
Claims (10)
1. The polytetrafluoroethylene guide sealing device is characterized by comprising a sealing element and a sealing ring, wherein the sealing element comprises a first sealing lip, a second sealing lip and a sealing body positioned between the first sealing lip and the second sealing lip, the sealing ring is sleeved on the sealing body,
the two ends of the sealing body are respectively connected with the first sealing lip and the second sealing lip, the end of the sealing body connected with the first sealing lip is the upper end of the sealing body, the end of the sealing body connected with the second sealing lip is the lower end of the sealing body, the inner diameter of the sealing body is gradually reduced in the axial direction from the upper end of the sealing body to the lower end of the sealing body,
the guide sealing device is of a hollow structure, a conical surface structure is formed on the inner wall of the sealing body, and a conical angle formed by the conical surface structure ranges from 75 degrees to 85 degrees.
2. The pilot seal of claim 1 wherein the first and second lips are each of a hollow, pie-shaped configuration, the outer wall of the seal body defining a conical surface configuration, the first lip being positioned above the second lip, the axes of the first lip, the second lip and the seal body being coincident.
3. The pilot seal of claim 1 wherein the first and second lips each have at least one annular groove in an inner wall thereof, the annular grooves having a sealing ring disposed therein, the sealing ring having a circular cross-section.
4. The pilot seal of claim 3 wherein the depth of the annular groove is no greater than the diameter of the cross-section of the seal ring, the width of the annular groove is equal to the diameter of the cross-section of the seal ring, and wherein two or more annular grooves are provided in the inner wall of the first seal lip, the width and depth of the annular grooves decreasing in the axial direction from the upper surface to the lower surface of the first seal lip.
5. The guiding and sealing device as claimed in claim 1, wherein the first sealing lip is provided with a guiding structure I, the guiding structure I is a conical surface structure I,
the sealing ring is located at the joint of the outer wall of the sealing body and the outer wall of the second sealing lip.
6. The guide seal device according to claim 4, wherein an arc transition section is arranged outside the joint of the seal body and the second seal lip, the cross section of the seal ring is arc-shaped, and the outer wall of the seal ring is tightly attached to the arc transition section.
7. The guide sealing device according to claim 1, characterized in that a guide structure II is arranged on the inner wall of the second sealing lip, the guide structure II has a conical surface structure II, and the conical angle of the conical surface structure II is 75-85 °.
8. The pilot seal assembly of claim 1 wherein the inner diameter of the junction of the inner wall of the seal body and the inner wall of the second lip is equal to the inner diameter of the first lip, and wherein the inner wall of the seal body and the outer wall of the shaft form a sealed chamber when the pilot seal assembly is fitted over the shaft.
9. The guiding and sealing device of claim 1, wherein the angle formed by the generatrix of the conical surface structure of the sealing body inner wall and the generatrix of the conical surface structure II of the guiding structure II is 75-85 degrees,
the guiding sealing device is made of polytetrafluoroethylene materials and comprises a polytetrafluoroethylene layer.
10. The pilot seal of claim 1 wherein the seal is a unitary structure, the pilot seal further comprising a fibrous layer, the fibrous layer being located within the polytetrafluoroethylene layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921299779.6U CN211288744U (en) | 2019-08-12 | 2019-08-12 | Polytetrafluoroethylene guiding and sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921299779.6U CN211288744U (en) | 2019-08-12 | 2019-08-12 | Polytetrafluoroethylene guiding and sealing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211288744U true CN211288744U (en) | 2020-08-18 |
Family
ID=72034976
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921299779.6U Active CN211288744U (en) | 2019-08-12 | 2019-08-12 | Polytetrafluoroethylene guiding and sealing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211288744U (en) |
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2019
- 2019-08-12 CN CN201921299779.6U patent/CN211288744U/en active Active
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