CN107859742B - Sealing ring structure and extruder applying same - Google Patents
Sealing ring structure and extruder applying same Download PDFInfo
- Publication number
- CN107859742B CN107859742B CN201711396793.3A CN201711396793A CN107859742B CN 107859742 B CN107859742 B CN 107859742B CN 201711396793 A CN201711396793 A CN 201711396793A CN 107859742 B CN107859742 B CN 107859742B
- Authority
- CN
- China
- Prior art keywords
- aggregate
- sealing
- sealing ring
- side wall
- shallow
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 238000007789 sealing Methods 0.000 title claims abstract description 120
- 239000000463 material Substances 0.000 claims abstract description 21
- 238000003756 stirring Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 239000012768 molten material Substances 0.000 abstract description 19
- 239000000843 powder Substances 0.000 abstract description 19
- 239000002994 raw material Substances 0.000 abstract description 19
- 238000005086 pumping Methods 0.000 description 8
- 230000005540 biological transmission Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
- F16J9/12—Details
- F16J9/20—Rings with special cross-section; Oil-scraping rings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Devices (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention relates to a sealing ring structure and an extruder applied by the same, wherein the sealing ring is provided with an axial central annular hole, the sealing ring is provided with a radial arranged sealing side wall surface, at least one pair of fan-shaped aggregate shallow pits are arranged on the sealing side wall surface, the axes of the aggregate shallow pits are arc-shaped, all the aggregate shallow pits are arranged on the periphery of the central annular hole in the same deflection direction, the inner ends of the aggregate shallow pits are communicated with the central annular hole, and the depth of the aggregate shallow pits gradually increases from outside to inside. In this way, the aggregate shallow pits on the side wall surface of the seal are used for generating hydrodynamic pressure to push the materials collected in the aggregate shallow pits to the direction of the central annular hole, so that the raw material powder or the molten materials are prevented from diffusing and leaking to the periphery, and radial sealing is realized.
Description
Technical Field
The invention relates to a sealing ring structure and an extruder applying the sealing ring.
Background
The use environment of the mechanical sealing element is deeply changed in the rapidly-developed modern industry, and the requirements on the working condition of the mechanical sealing element are more severe, and the mechanical sealing element is forward developed in the directions of high speed, high pressure, low temperature, high vacuum and the like. Taking an extruder as an example, the extruder belongs to one type of plastic machinery. As shown in fig. 1, the extruder comprises a material cylinder 1 for storing materials, a rotor 2 for stirring the materials is arranged in the material cylinder 1, a driving device 3 for driving the rotor 2 to rotate is further included, an output end 30 of the driving device 3 is connected with an axial extension end 20 of the rotor 2, and the output end 30 is rotatably arranged on the material cylinder 1 through a bearing 4. The material to be processed is generally raw material powder, and is put into the charging barrel to be stirred together with water or other liquid to form molten material. During stirring, the raw material powder or molten material is very liable to leak out of the cartridge 1 through the gap between the rotor shaft extension 20 and the cartridge 1 and run onto the bearing 4 and even into the driving device 3, resulting in a decrease in the rotational performance of the bearing 4 and the driving device 3 and even damage. In order to solve the above-mentioned problems, a solution that is currently in common use is to provide a rotary seal ring 5 between the cartridge 1 and the rotor shaft extension 20. As shown in fig. 2, the rotary seal ring 5 has an outer ring frame 50 and an elastic seal ring 51 provided in an annular space of the outer ring frame 50. The outer ring skeleton 50 also has smooth radially extending sealing planes 501. The rotary sealing ring 5 is sleeved on the rotor shaft extending end 20, and a gap between the rotor shaft extending end 20 and the rotary sealing ring 5 is axially sealed through the elastic sealing ring 51. The rotary sealing ring 5 is also screwed onto the outlet 30 and has its sealing surface 501 pressed against the cartridge 1. This provides a radial sealing by the close contact between the sealing surface 501 of the rotary sealing ring 5 and the cartridge 1. However, as the extruder is used for a longer time, the sealing plane 501 of the rotary seal ring 5 wears and the elastic seal ring 51 ages, resulting in a gradually increasing gap between the rotor shaft extension 20 and the rotary seal ring 5 and between the rotary seal ring 5 and the barrel 1. The raw material powder and the molten material in the cartridge 1 are very liable to leak out of the cartridge 1 through the gap to damage the bearing 4 and even the power transmission member in the driving device 3.
Disclosure of Invention
In view of the shortcomings of the prior art, there is a need for an improved seal ring structure. In view of this, the present invention proposes a seal ring structure having an axial central annular hole, characterized in that the seal ring has a radially arranged seal side wall surface on which at least one pair of aggregate shallow pits in the shape of a deflection groove are provided, the axes of the aggregate shallow pits being arc-shaped and all the aggregate shallow pits being arranged in the same deflection direction at the outer periphery of the central annular hole, the inner ends of the aggregate shallow pits communicating with the central annular hole, the depth of the aggregate shallow pits gradually increasing from the outside to the inside.
Wherein the central axis of the central annular ring is arranged in an axial direction and the sealing sidewall surfaces are arranged in a radial direction, such that the central axis of the central annular ring and the sealing sidewall surfaces are arranged perpendicular to each other.
The sealing side wall surface is a sealing surface for being attached to a component to form a surface seal.
The aggregate shallow pit is a shallow concave cavity arranged on the sealing side wall surface and can be used for collecting raw material powder or molten materials leaked to the sealing side wall surface, and the inner end of the aggregate shallow pit is communicated with the central annular hole, so that the raw material powder or molten materials collected in the aggregate shallow pit can enter the central annular hole to smoothly leave the aggregate shallow pit, the collection capacity of the aggregate shallow pit is weakened due to the fact that the raw material powder or molten materials are accumulated in the shallow concave cavity for a long time, and the aggregate shallow pit can continuously collect the raw material powder or molten materials. On the basis, the axis of the aggregate shallow pit is arc-shaped, and the depth of the aggregate shallow pit gradually increases from outside to inside, so that when the sealing ring rotates in the opposite direction of the deflection direction of the aggregate shallow pit, the aggregate shallow pit can generate hydrodynamic pressure to push materials collected in the aggregate shallow pit to the direction of the central annular hole.
Therefore, compared with the prior art, the sealing ring provided with the aggregate shallow pits has the following beneficial effects compared with the traditional sealing ring: the sealing ring has a sealing side wall surface, by means of which a surface seal can be formed for other components. When the sealing side wall surface is worn to cause gaps between the sealing ring and other components, the materials collected in the aggregate shallow pits can be pushed to the direction of the central annular hole by means of hydrodynamic pressure generated by the aggregate shallow pits on the sealing side wall surface, so that raw material powder or molten materials are prevented from diffusing and leaking to the periphery, and radial sealing is realized.
The further technical scheme may be that three aggregate shallow pits are arranged on the sealing side wall surface of the sealing ring. In this way, the hydrodynamic pressure generated when the seal ring rotates can be optimized.
Further technical scheme may be that the sealing ring is further provided with an axially extending connecting hole, and the connecting hole and the aggregate shallow pit are arranged left and right. In this way, the fastener can pass through the connecting hole to lock the sealing ring.
Further technical scheme may be that a sealing spiral groove is arranged on the hole side wall of the central annular hole. Thus, in a specific application, when the sealing ring is sleeved on the shaft element through the central annular hole and rotates around the shaft element, the raw material powder or molten material in the sealing spiral groove generates a pumping pressure head under the driving of the sealing spiral groove, and when the pressure of the pumping pressure head and the pressure of the sealed medium are balanced, the sealed medium can be prevented from leaking out from a gap between the sealing ring and the shaft element, so that the function of axial sealing is realized.
The invention also provides an extruder applying the sealing ring, which is characterized by comprising a charging barrel and the sealing ring, wherein a rotor for stirring materials is arranged in the charging barrel, the sealing ring is sleeved on the shaft extension end of the rotor through the central annular hole in a penetrating way, and the sealing side wall surface of the sealing ring is tightly attached to the charging barrel or a cushion block arranged on the charging barrel, so that a dynamic sealing structure can be formed between the sealing ring and the charging barrel or the cushion block, and in the dynamic sealing process, the rotating direction of the sealing ring is opposite to the deflecting direction of the aggregate shallow pit, so that the materials collected in the aggregate shallow pit can be pushed to the central annular hole. The shaft extension end of the rotor is a section area provided with a non-extrusion working surface and is used for being connected with a power device for driving the rotor to rotate. In this way, the radial dynamic seal is performed by the sealing side wall surface of the sealing ring and the aggregate shallow pits on the sealing side wall surface, so that the materials in the charging barrel can be prevented from easily leaking outwards through the gap between the sealing side wall surface and the charging barrel or the cushion block.
Since the invention has the above characteristics and advantages, it can be applied to sealing rings and also to dynamic sealing structures of the extruder.
Drawings
FIG. 1 is a schematic view of a sealing structure of an extruder in the prior art;
FIG. 2 is a schematic plan view of a prior art seal ring;
FIG. 3 is a schematic perspective view of a seal ring to which the technical scheme of the present invention is applied;
FIG. 4 is a schematic view of the front view of the seal ring shown in FIG. 3;
FIG. 5 is a schematic cross-sectional view of the structure of FIG. 4 in the direction A-A;
FIG. 6 is a schematic view of the structure of the front view direction of an extruder adopting a dynamic seal structure, which is applied to the technical scheme of the invention;
FIG. 7 is a schematic cross-sectional view of the structure in the direction B-B in FIG. 6;
Fig. 8 is an enlarged schematic view of the C portion in fig. 7.
Detailed Description
The sealing ring applying the technical scheme of the invention and the structure of the extruder applying the sealing ring are further described below with reference to the accompanying drawings.
As shown in fig. 3, 4 and 5, which are schematic structural views of the seal ring 5, the seal ring 5 has an axial central annular hole 53, the seal ring 5 has a radially arranged seal side wall surface 50, and three aggregate shallow recesses 51 having a deflection groove shape are provided on the seal side wall surface 50, however, in other embodiments, it is also possible to provide one or more pairs of the aggregate shallow recesses 51. The axes of the aggregate shallow pockets 51 are arc-shaped and all the aggregate shallow pockets 51 are arranged on the outer periphery of the central annular hole 53 in the same deflection direction, the inner ends of the aggregate shallow pockets 51 are communicated with the central annular hole 53, and the depth of the aggregate shallow pockets 51 is gradually increased from outside to inside.
Wherein the central axis of the central annular ring 53 is arranged in the axial direction and the sealing sidewall surface 50 is arranged in the radial direction. In this way, the central axis of the central annular ring 53 and the sealing sidewall surface 50 are arranged perpendicular to each other.
The seal side wall surface 50 is a seal surface for forming a surface seal in contact with a member thereof.
Wherein the aggregate shallow pit 51 is a shallow cavity arranged on the sealing side wall surface 50, and can be used for collecting raw material powder or molten material leaked to the sealing side wall surface 50, and the raw material powder or molten material collected in the aggregate shallow pit 51 enters the central annular hole 53 to smoothly discharge the aggregate shallow pit 51 by means of the structure that the inner end of the aggregate shallow pit 51 is communicated with the central annular hole 53, so that the collection capacity of the aggregate shallow pit 51 is weakened by long-time accumulation of the raw material powder or molten material in the shallow cavity, and the aggregate shallow pit 51 can continuously collect the raw material powder or molten material. On this basis, the axis of the aggregate shallow pit 51 is arc-shaped, and the depth of the aggregate shallow pit 51 is gradually increased from outside to inside, so that when the sealing ring 5 rotates in the direction opposite to the deflection direction of the aggregate shallow pit 51, the aggregate shallow pit 51 can generate hydrodynamic pressure to push the material collected in the aggregate shallow pit 51 to the direction of the central annular hole 53.
It can be seen that, compared with the prior art, the sealing ring 5 provided with the aggregate shallow pits 51 of the present invention has the following advantages compared with the conventional sealing ring: the sealing ring 5 has a sealing side wall surface 50, with the aid of which sealing side wall surface 50 a surface seal can be formed for other components. When the sealing side wall surface 50 is worn to cause gaps between the sealing ring 5 and other components, the material collected in the aggregate shallow pit 51 can be pushed to the direction of the central annular hole 53 by means of hydrodynamic pressure generated by the aggregate shallow pit 51 on the sealing side wall surface 50, so that the raw material powder or molten material is prevented from diffusing and leaking to the periphery, and radial sealing is realized.
The sealing ring 5 is also provided with an axially extending connecting hole 52, and the connecting hole 52 is arranged left and right of the aggregate shallow pit 51. A fastener may be passed through the connection hole 52 to lock the seal ring 5. A sealing helical groove 54 is provided on the hole side wall of the central annular hole 53. In a specific application, when the sealing ring 5 is sleeved on a shaft member through the central annular hole 53 and rotates around the shaft member, the raw material powder or molten material in the sealing spiral groove 54 generates a pumping pressure head under the driving of the sealing spiral groove 54, and when the pressure of the pumping pressure head and the pressure of the sealed medium are balanced, the sealed medium can be prevented from leaking out from a gap between the hole side wall of the sealing ring 5 and the shaft member, so that the function of axial sealing is realized.
As shown in fig. 6, 7 and 8, the present invention also proposes an extruder 100 to which the sealing ring 5 is applied. The extruder 100 comprises a charging barrel 1 and the sealing ring 5, wherein a flange 11 is arranged at the tail end of the charging barrel 1, and a rotor 2 for stirring materials is arranged in the charging barrel 1. A power unit 3 is disposed at the rear of the cartridge 1, and the power unit 3 includes a motor 31 and a decelerator 32 connected to an output end of the motor 31. The decelerator 32 has a first output 321 and a second output 322. The shaft extension end 20 of the rotor 2 stretches out of the charging barrel 1 and is in transmission connection with the first output end 321. The second output end 322 is rotatably disposed in the central disk hole of the flange 11 via the bearing 4. The sealing ring 5 is sleeved on the shaft extension end 20 of the rotor 2 through the central annular hole 53, the sealing side wall surface 50 of the sealing ring is tightly attached to the charging barrel 1, and a fastener passes through the connecting hole 52 of the sealing ring 5 to connect the sealing ring 5 to the second output end 322. In order to reduce wear of the cartridge 1, a spacer may also be provided on the cartridge 1, against which the sealing side wall 50 is in close contact. The rotation direction of the sealing ring 5 is opposite to the deflection direction of the aggregate shallow pit 51 under the drive of the power device 3, so that the materials collected in the aggregate shallow pit 51 can be pushed to the direction of the central annular hole 53 to realize radial dynamic sealing. In another embodiment, the power unit 3 may be provided with only one output and the output is connected to the rotor 2, and the seal ring 5 is connected to the rotor 2. In this way, the sealing ring 5 can rotate together with the rotor 2 to simplify the structure of the power plant 3.
As shown in fig. 8, in addition to the seal spiral groove 54 provided on the hole side wall of the central annular hole 53, a seal spiral groove 21 capable of generating pumping force to push the material in the central annular hole 53 toward the cartridge 1 is provided on the shaft side wall of the shaft extension end 20 corresponding to the hole side wall. Under the drive of the sealing spiral grooves (54 and 21), the raw material powder or molten material in the sealing spiral grooves (54 and 21) generates a pumping pressure head, and when the pumping pressure head and the pressure of the sealed raw material powder or molten material in the charging barrel 1 reach an equilibrium state, the sealed raw material powder or molten material is prevented from leaking out of the charging barrel 1 from a gap between the hole side wall of the sealing ring 5 and the shaft side wall of the shaft extension end 20, so that the axial dynamic seal is realized. In addition, the seal spiral groove 54 on the hole side wall and the seal spiral groove 21 on the shaft side wall can cooperate to improve pumping force, so that sealing effect can be greatly improved. In this case, the axial length of the seal spiral grooves (54, 21) can be shortened to reduce the occupied space, so that the structure of the extruder can be made more compact. Of course, in the case of an adequate installation space of the extruder, the sealing spiral groove (54 or 21) can be provided only on the bore side wall of the central annular ring 53 or on the shaft side wall of the shaft extension 20.
In summary, a radial dynamic seal can be formed between the seal ring 5 and the cylinder 1, and an axial dynamic seal can be formed between the seal ring 5 and the shaft extension end 20 of the rotor 2, so that the material in the cylinder 1 can be well double-sealed to prevent the material from leaking out to damage the bearing 4 or the power device 3. Since the present invention has the above-mentioned features and advantages, it can be applied to a dynamic seal structure of the extruder.
Claims (2)
1. The sealing ring structure is provided with an axial central annular hole, and is characterized in that the sealing ring is provided with a radial arranged sealing side wall surface, at least one pair of aggregate shallow pits in a deflection groove shape are arranged on the sealing side wall surface, the axes of the aggregate shallow pits are arc-shaped, all the aggregate shallow pits are arranged on the periphery of the central annular hole in the same deflection direction, the inner ends of the aggregate shallow pits are communicated with the central annular hole, and the depth of the aggregate shallow pits is gradually increased from outside to inside;
Three aggregate shallow pits are formed in the sealing side wall surface of the sealing ring;
The sealing ring is also provided with an axially extending connecting hole which is arranged left and right with the aggregate shallow pit;
A sealing helical groove is arranged on the hole side wall of the central annular hole.
2. The extruder with the sealing ring according to claim 1, comprising a charging barrel and the sealing ring, wherein a rotor for stirring materials is arranged in the charging barrel, the sealing ring is sleeved on the shaft extension end of the rotor through the central annular hole in a penetrating way, and the sealing side wall surface of the sealing ring is tightly attached to the charging barrel or a cushion block arranged on the charging barrel, so that a dynamic sealing structure can be formed between the sealing ring and the charging barrel or the cushion block, and in the dynamic sealing process, the rotation direction of the sealing ring is opposite to the deflection direction of the aggregate shallow pit, so that the materials collected in the aggregate shallow pit can be pushed to the central annular hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711396793.3A CN107859742B (en) | 2017-12-21 | 2017-12-21 | Sealing ring structure and extruder applying same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711396793.3A CN107859742B (en) | 2017-12-21 | 2017-12-21 | Sealing ring structure and extruder applying same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107859742A CN107859742A (en) | 2018-03-30 |
| CN107859742B true CN107859742B (en) | 2024-06-11 |
Family
ID=61706918
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711396793.3A Active CN107859742B (en) | 2017-12-21 | 2017-12-21 | Sealing ring structure and extruder applying same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107859742B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110370483A (en) * | 2019-08-27 | 2019-10-25 | 青岛科技大学 | A kind of closed-smelting machine rotor sealing structure |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101234526A (en) * | 2008-03-05 | 2008-08-06 | 大连橡胶塑料机械股份有限公司 | Sealing device for extrusion machine screw rod tail |
| CN106763778A (en) * | 2016-12-12 | 2017-05-31 | 昆明理工大学 | A kind of upstream pumping mechanical seal ring with multiple coil groove |
| CN207762239U (en) * | 2017-12-21 | 2018-08-24 | 广东星联科技有限公司 | Seal ring structure and its extruder of application |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5507498A (en) * | 1993-10-13 | 1996-04-16 | Synergy Extrusion Technologies, Inc. | Sealing device for polymer filtration apparatus |
| US20050006850A1 (en) * | 2003-05-05 | 2005-01-13 | Gerold Barth | Shaft of a shredding device and a shredding device |
| CN100588861C (en) * | 2006-11-16 | 2010-02-10 | 比亚迪股份有限公司 | Dynamic seal device |
| CN201665646U (en) * | 2009-12-29 | 2010-12-08 | 天津东洋油墨有限公司 | Extruder sealing device for ink making |
| CN101846143A (en) * | 2010-06-23 | 2010-09-29 | 北京理工大学 | Seal ring with even-depth spiral groove on end face |
| CN103090006B (en) * | 2013-02-04 | 2014-04-16 | 北京理工大学 | Spiral groove rotary sealing ring with cone-shaped cross section and used on vehicle |
| CN206361151U (en) * | 2016-12-12 | 2017-07-28 | 昆明理工大学 | A kind of mechanical seal ring with many zigzag helicla flutes |
-
2017
- 2017-12-21 CN CN201711396793.3A patent/CN107859742B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101234526A (en) * | 2008-03-05 | 2008-08-06 | 大连橡胶塑料机械股份有限公司 | Sealing device for extrusion machine screw rod tail |
| CN106763778A (en) * | 2016-12-12 | 2017-05-31 | 昆明理工大学 | A kind of upstream pumping mechanical seal ring with multiple coil groove |
| CN207762239U (en) * | 2017-12-21 | 2018-08-24 | 广东星联科技有限公司 | Seal ring structure and its extruder of application |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107859742A (en) | 2018-03-30 |
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