CN112503020A - Machine seal structure - Google Patents
Machine seal structure Download PDFInfo
- Publication number
- CN112503020A CN112503020A CN202011462394.4A CN202011462394A CN112503020A CN 112503020 A CN112503020 A CN 112503020A CN 202011462394 A CN202011462394 A CN 202011462394A CN 112503020 A CN112503020 A CN 112503020A
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- Prior art keywords
- liquid
- ring
- groove
- liquid inlet
- liquid outlet
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- 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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- 239000007788 liquid Substances 0.000 claims abstract description 153
- 239000000110 cooling liquid Substances 0.000 claims abstract description 24
- 230000003068 static effect Effects 0.000 claims abstract description 12
- 238000004891 communication Methods 0.000 claims description 14
- 230000006835 compression Effects 0.000 claims description 10
- 238000007906 compression Methods 0.000 claims description 10
- 238000010030 laminating Methods 0.000 claims description 3
- 239000002826 coolant Substances 0.000 abstract description 16
- 230000000694 effects Effects 0.000 abstract description 13
- 238000001816 cooling Methods 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 3
- 238000005119 centrifugation Methods 0.000 abstract description 2
- 238000007789 sealing Methods 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 230000000670 limiting effect Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/10—Shaft sealings
- F04D29/12—Shaft sealings using sealing-rings
- F04D29/126—Shaft sealings using sealing-rings especially adapted for liquid pumps
- F04D29/128—Shaft sealings using sealing-rings especially adapted for liquid pumps with special means for adducting cooling or sealing fluid
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/586—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps
- F04D29/5886—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps cooling by injection
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention relates to a machine seal structure, which comprises a rotating shaft, a movable ring and a static ring, wherein the movable ring is sleeved on the rotating shaft, the static ring is attached to the movable ring, and a liquid inlet and a liquid outlet are respectively formed in the static ring; the liquid inlet groove and the liquid outlet groove that set up with one heart are seted up on the rotating ring, the liquid inlet groove with the liquid outlet groove communicates each other, the liquid inlet groove with the coaxial setting of pivot, and the liquid inlet groove with the coaxial setting of pivot, wherein the coolant liquid be suitable for certainly the liquid inlet groove warp the pivot is rotated the centrifugation and is poured into the liquid outlet groove. The rotating shaft drives the movable ring to rotate relative to the stationary ring, so that the working process is simple and quick; the circulation of cooling liquid and the good cooling effect of the whole are realized through the mutual matching of the liquid inlet, the liquid outlet and the liquid inlet tank and the liquid outlet tank; the liquid inlet groove, the liquid outlet groove and the rotating shaft are coaxially arranged, so that a good centrifugal force is conveniently provided for the cooling liquid entering the liquid inlet groove, and the effect of guiding circulation is realized.
Description
Technical Field
The invention relates to the technical field of mechanical cooling sealing, in particular to a mechanical seal structure.
Background
The mechanical seal structure (simply referred to as "mechanical seal structure") of the existing water pump or mechanical pump generally adopts a single-end-face mechanical seal form, but in such a seal form, when the pump body does not have water to enter or other materials enter, the pump body can idle by itself, the temperature of the contact end face of the movable ring and the static ring can be rapidly increased at the moment, and then the rubber seal is burnt or the rapid aging of the rubber seal is accelerated, so that the pump body is leaked to cause damage.
The existing Chinese patent with application number of CN201910516907.6 provides a water-cooled single-end-face mechanical sealing structure and a working method thereof, and the main method is that a sealing loop is arranged on one side of a moving ring, which is in contact with a static ring, and cooling water is introduced from the outside, so that heat generated by the moving ring in frictional contact with the static ring is effectively dissipated, and the static ring is kept in a reasonable temperature range all the time; however, in this scheme, when the rotating shaft stops rotating, the cooling liquid pumped by the driving of the impeller still stays in the water inlet pipeline, the water outlet pipeline and the loop, and the overall sealing effect is also general.
Therefore, it is necessary to provide a sealing structure having a good sealing effect.
Disclosure of Invention
The invention aims to provide a machine seal structure with good sealing effect so as to solve the problems.
In order to achieve the above object, an embodiment of the present invention provides a machine seal structure, including a rotating shaft, a rotating ring sleeved on the rotating shaft, and a stationary ring attached to the rotating ring, wherein the stationary ring is respectively provided with a liquid inlet and a liquid outlet; the movable ring is provided with a liquid inlet groove and a liquid outlet groove which are concentrically arranged, the liquid inlet groove and the liquid outlet groove are communicated with each other, the liquid inlet groove and the rotating shaft are coaxially arranged, and
the liquid inlet groove and the rotating shaft are coaxially arranged, wherein
The cooling liquid is suitable for being centrifugally injected into the liquid outlet groove from the liquid inlet groove through the rotation of the rotating shaft.
Preferably, the liquid inlet tank and the liquid outlet tank are communicated with each other through a first communicating hole and a second communicating hole;
the liquid inlet inner ring wall of the liquid inlet groove is inclined, and the intersection point of the central axis of the first communication hole and the central axis of the liquid inlet on the liquid inlet outer wall of the liquid inlet groove is positioned at the same horizontal position;
the liquid outlet outer ring wall of the liquid outlet groove is inclined, and the intersection point of the central axis of the second communicating hole and the central axis of the liquid outlet on the liquid outlet outer ring wall of the liquid outlet groove is located at the same horizontal position.
Preferably, the inclination angle of the liquid inlet inner ring wall and the liquid outlet outer ring wall is 45 degrees.
Preferably, the mechanical seal structure further comprises a spring seat sleeved on the rotating shaft and a compression spring sleeved on the rotating shaft, wherein one end of the compression spring abuts against the spring seat, and the other end of the compression spring abuts against the end face of the movable ring.
Preferably, a guide ring wall is arranged at one end face of the spring seat, and an outer ring of the movable ring is attached to an inner ring of the guide ring wall.
Preferably, a limiting ring is arranged at the joint end face of the static ring, and the movable ring is clamped in the limiting ring.
Preferably, the mechanical seal structure further comprises a cooling liquid tank, negative pressure is formed inside the cooling liquid tank, a liquid outlet pipe of the cooling liquid tank is connected and communicated with the liquid inlet, and a liquid inlet pipe of the cooling liquid tank is connected and communicated with the liquid outlet.
The invention has the following beneficial effects:
1. the rotating shaft drives the movable ring to rotate relative to the stationary ring, so that the working process is simple and quick;
2. the circulation of cooling liquid and the good cooling effect of the whole are realized through the mutual matching of the liquid inlet, the liquid outlet and the liquid inlet tank and the liquid outlet tank;
3. the liquid inlet groove, the liquid outlet groove and the rotating shaft are coaxially arranged, so that a good centrifugal force is conveniently provided for the cooling liquid entering the liquid inlet groove, and the effect of guiding circulation is realized.
Drawings
The invention is further illustrated with reference to the following figures and examples.
Fig. 1 is a schematic cross-sectional view illustrating a sealing structure according to an embodiment of the present invention;
fig. 2 shows a combined structure diagram of a moving ring and a stationary ring provided by the embodiment of the invention.
In the figure: 1. a rotating shaft; 2. a moving ring; 201. a liquid inlet tank; 2011. liquid inlet inner ring wall; 202. a liquid outlet groove; 2021. liquid outlet outer ring wall; 3. a stationary ring; 301. a liquid inlet; 302. a liquid outlet; 303. a limiting ring; 4. a spring seat; 401. a guide ring wall; 5. a compression spring; 6. a coolant tank; 601. a liquid outlet pipe; 602. a liquid inlet pipe.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
The machine seal structure in the prior art mainly adopts a structure that a rotating shaft 1 and a moving ring 2 are matched with a static ring 3, and a cooling groove is also formed in the structure of the moving ring 2, but the cooling groove is usually formed by injecting and circulating cooling liquid by a pump body, and the cooling groove needs more external force to realize the circulation of the cooling liquid.
As shown in fig. 1 and 2;
rotating ring 2
The structure of the movable ring 2 is mainly adapted and sleeved on the rotating shaft 1, and the movable ring rotates along with the rotating shaft 1 in a linkage manner under the rotating action of the rotating shaft 1. The liquid inlet groove 201 and the liquid outlet groove 202 are coaxially arranged on one end surface of the moving ring 2, and it should be noted that the shapes of the liquid inlet groove 201 and the liquid outlet groove 202 are not necessarily circular, but may be square rings or other shapes, preferably circular rings.
A first communication hole and a second communication hole are arranged between the liquid inlet tank 201 and the liquid outlet tank 202, the liquid inlet tank 201 and the liquid outlet tank 202 are communicated through the first communication hole and the second communication hole, and the cross-sectional shapes of the first communication hole and the second communication hole are preferably circular.
The liquid inlet inner ring wall 2011 of the liquid inlet groove 201 is arranged obliquely, preferably, the inclination degree of the liquid inlet inner ring wall 2011 is 45 degrees, the liquid outlet outer ring wall 2021 of the liquid outlet groove 202 is arranged obliquely, and preferably, the inclination degree of the liquid outlet outer ring wall 2021 is 45 degrees.
The stationary ring 3 is adapted to be attached to the movable ring 2, wherein the stationary ring 3 is provided with a liquid inlet 301 and a liquid outlet 302, and the stationary ring 3 is provided with a limit ring 303 on the end surface of the attachment ring.
Example one
A machine seal structure comprises a rotating shaft 1, a movable ring 2 sleeved on the rotating shaft 1, and a stationary ring 3 attached to the movable ring 2, wherein a liquid inlet 301 and a liquid outlet 302 are respectively formed in the stationary ring 3; set up two feed liquor grooves 201 and play liquid groove 202 that set up with one heart on the rotating ring 2, feed liquor groove 201 with go out liquid groove 202 intercommunication each other, feed liquor groove 201 with 1 coaxial settings of pivot, and feed liquor groove 201 with 1 coaxial settings of pivot, wherein the coolant liquid be suitable for certainly feed liquor groove 201 warp 1 rotation of pivot centrifugation is poured into go out liquid groove 202.
The rotating shaft 1 drives the movable ring 2 to rotate relative to the stationary ring 3, and the working process is simple and rapid; the liquid inlet 301 and the liquid outlet 302 are matched with each other, and the liquid inlet groove 201 and the liquid outlet groove 202 are matched with each other, so that the circulation of cooling liquid and the good cooling effect of the whole are realized; the liquid inlet groove 201, the liquid outlet groove 202 and the rotating shaft 1 are coaxially arranged, so that a good centrifugal force is provided for the cooling liquid entering the liquid inlet groove 201, and the effect of guiding circulation is achieved.
In some embodiments, the liquid inlet tank 201 and the liquid outlet tank 202 are communicated with each other through a first communication hole and a second communication hole; the liquid inlet inner ring wall 2011 of the liquid inlet groove 201 is inclined, and the intersection point of the central axis of the first through hole and the central axis of the liquid inlet 301 on the liquid inlet outer wall of the liquid inlet groove 201 is located at the same horizontal position; the liquid outlet outer ring wall 2021 of the liquid outlet groove 202 is inclined, and an intersection point of the central axis of the second communication hole and the central axis of the liquid outlet 302 on the liquid outlet outer ring wall 2021 of the liquid outlet groove 202 is located at the same horizontal position.
With this arrangement, the coolant injected from the liquid inlet 301 can straightly enter the first communicating hole after striking the liquid inlet inner ring wall 2011, that is, the incident angle is equal to the reflection angle, so as to ensure that the whole coolant can be injected into the liquid outlet groove 202 quickly and well. Similarly, the coolant flowing out from the second communication hole can also be discharged by directly flowing into the liquid outlet 302 after impacting the liquid outlet outer ring wall 2021, that is, the incident angle is equal to the reflection angle so as to ensure that the whole coolant can be discharged out of the liquid outlet groove 202 quickly and well.
It should be noted that, because the moving ring 2 rotates continuously, the liquid inlet 301 and the first communicating hole cannot be aligned continuously, and the liquid outlet 302 and the second communicating hole cannot be aligned continuously, here, it is only ensured that the injection position of the cooling liquid is always on a circular orbit line of the liquid inlet inner wall 2011, and when the cooling liquid is injected into the liquid discharge groove from the liquid inlet groove 201, the discharge position of the cooling liquid is always on a circular orbit line of the liquid outlet outer wall 2021. Thereby promoting circulation of the entire coolant.
In some embodiments, it is preferable that the inclination angle of the liquid inlet inner ring wall 2011 and the liquid outlet outer ring wall 2021 is 45 °. Through this 45 selection, it is convenient to enable the coolant to strike horizontally on the side walls of the inlet tank 201 and vertically on the side walls of the outlet tank 202.
In some embodiments, the mechanical seal structure further includes a spring seat 4 fixed on the rotating shaft 1, and a compression spring 5 fixed on the rotating shaft 1, wherein one end of the compression spring 5 abuts against the spring seat 4, and the other end abuts against an end surface of the rotating ring 2. This pressure spring 5's setting is convenient for make better laminating between rotating ring 2 and the quiet ring 3, prevents that the coolant liquid from in-process that continuously flows, the condition of leaking appears.
In some embodiments, the spring seat 4 has a guide ring wall 401 at one end surface, and the outer ring of the rotating ring 2 is attached to the inner ring of the guide ring wall 401. Wherein, the selection of direction rampart 401, because pressure spring 5 is in compression state, and if it receives the impact force and is convenient for realize once more the extrusion or will appear restoring to the throne after the extrusion, and under the guide effect of direction rampart 401, can be fine play the direction effect, avoid the condition that dislocation appears in movable ring 2.
In some embodiments, a stop ring 303 is disposed at the joint end surface of the stationary ring 3, and the movable ring 2 is clamped in the stop ring 303. The arrangement of the spacing ring 303 has the following beneficial effects:
1. the guide ring wall 401 is matched to realize good guide sliding and circumferential limiting effects;
2. because how much there is the revealing of coolant liquid between the movable ring 2 and the laminating gap of quiet ring 3, and after setting up spacing ring 303, the disclosure of hindrance coolant liquid that can be fine guarantees whole good sealing performance.
Example two
The second embodiment is carried out on the basis of the first embodiment
The machine seals the structure and still includes a coolant liquid case 6, the inside negative pressure that forms of coolant liquid case 6, coolant liquid case 6's drain pipe 601 with inlet 301 is connected and is communicate, coolant liquid case 6's feed liquor pipe 602 with liquid outlet 302 is connected and is communicated.
By adopting the technical scheme, the method has the following advantages: when the internal liquid or other conditions cause leakage because of the machine seal wearing and tearing, because the existence of cooler bin, can make this liquid that leaks extrude to the machine seal in the fine to avoid the condition of leaking to the outside.
And, because of the existence of negative pressure, impel external atmospheric pressure to laminate rotating ring 2 on quiet ring 3, guarantee good sealed effect.
And the static ring 3 and the dynamic ring 2 are arranged, under the rotation of the rotating shaft 1, the cooling liquid flows from the water inlet groove to the water outlet groove under the action of centrifugal force, so that a good guiding centrifugal effect is realized, and the cooling liquid is driven to flow in a circulating manner.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A machine seal structure comprises a rotating shaft (1), a movable ring (2) sleeved on the rotating shaft (1), and a static ring (3) attached to the movable ring (2), and is characterized in that a liquid inlet (301) and a liquid outlet (302) are respectively formed in the static ring (3); set up two feed liquor grooves (201) and play liquid groove (202) that set up with one heart on rotating ring (2), feed liquor groove (201) with go out liquid groove (202) intercommunication each other, feed liquor groove (201) with pivot (1) coaxial arrangement to and
the liquid inlet groove (201) and the rotating shaft (1) are coaxially arranged, wherein
The cooling liquid is suitable for being injected into the liquid outlet groove (202) from the liquid inlet groove (201) through the rotation of the rotating shaft (1) in a centrifugal mode.
2. The machine seal structure of claim 1,
the liquid inlet groove (201) and the liquid outlet groove (202) are communicated with each other through a first communication hole and a second communication hole;
the liquid inlet inner ring wall (2011) of the liquid inlet groove (201) is inclined, and the intersection point of the central axis of the first through hole and the central axis of the liquid inlet (301) on the liquid inlet outer wall of the liquid inlet groove (201) is positioned at the same horizontal position;
the liquid outlet outer ring wall (2021) of the liquid outlet groove (202) is inclined, and the intersection point of the central axis of the second communication hole and the central axis of the liquid outlet (302) on the liquid outlet outer ring wall (2021) of the liquid outlet groove (202) is located at the same horizontal position.
3. The machine seal structure of claim 2,
the inclination angle of the liquid inlet inner ring wall (2011) and the liquid outlet outer ring wall (2021) is 45 degrees.
4. The machine seal structure of claim 1,
the mechanical seal structure further comprises a spring seat (4) sleeved on the rotating shaft (1) and a compression spring (5) sleeved on the rotating shaft (1), wherein one end of the compression spring (5) is abutted against the spring seat (4), and the other end of the compression spring is abutted against the end face of the movable ring (2).
5. The machine seal structure of claim 4,
one end face of the spring seat (4) is provided with a guide annular wall (401), and the outer ring of the movable ring (2) is attached to the inner ring of the guide annular wall (401).
6. The machine seal structure of claim 1,
the laminating terminal surface department of quiet ring (3) is provided with a spacing ring (303), rotating ring (2) card is established in spacing ring (303).
7. The machine seal structure of claim 1,
the mechanical seal structure further comprises a cooling liquid box (6), negative pressure is formed inside the cooling liquid box (6), a liquid outlet pipe (601) of the cooling liquid box (6) is connected with the liquid inlet (301) and communicated with the liquid outlet (302), and a liquid inlet pipe (602) of the cooling liquid box (6) is connected with the liquid outlet (302) and communicated with the liquid outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011462394.4A CN112503020A (en) | 2020-12-14 | 2020-12-14 | Machine seal structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011462394.4A CN112503020A (en) | 2020-12-14 | 2020-12-14 | Machine seal structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112503020A true CN112503020A (en) | 2021-03-16 |
Family
ID=74972401
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011462394.4A Pending CN112503020A (en) | 2020-12-14 | 2020-12-14 | Machine seal structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112503020A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030140751A1 (en) * | 2001-12-28 | 2003-07-31 | Coe Newnes/Mcgehee Ulc | Saw guide pad seal |
| CN204532948U (en) * | 2015-03-16 | 2015-08-05 | 中国石油化工股份有限公司 | Mechanical seal device and centrifugal pump |
| CN207364266U (en) * | 2017-11-06 | 2018-05-15 | 中油管道京磁新材料有限责任公司 | Storage tank sealing device |
| CN208348145U (en) * | 2018-05-30 | 2019-01-08 | 四川大禹机械密封件制造有限公司 | Large arch dam easily crystallizes fluid machinery sealing device |
| CN110131417A (en) * | 2019-01-25 | 2019-08-16 | 宁波奉化明磊弹簧厂 | A kind of band water cooling single mechanical end face seal structure and its working method |
| CN110792630A (en) * | 2019-11-07 | 2020-02-14 | 南京工程学院 | Air-cooled bellows dry gas sealing device |
| CN111405163A (en) * | 2020-04-16 | 2020-07-10 | 项本霞 | Antifog camera |
| CN214247785U (en) * | 2020-12-14 | 2021-09-21 | 宁波奉化明磊弹簧厂 | Machine seal structure |
-
2020
- 2020-12-14 CN CN202011462394.4A patent/CN112503020A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030140751A1 (en) * | 2001-12-28 | 2003-07-31 | Coe Newnes/Mcgehee Ulc | Saw guide pad seal |
| CN204532948U (en) * | 2015-03-16 | 2015-08-05 | 中国石油化工股份有限公司 | Mechanical seal device and centrifugal pump |
| CN207364266U (en) * | 2017-11-06 | 2018-05-15 | 中油管道京磁新材料有限责任公司 | Storage tank sealing device |
| CN208348145U (en) * | 2018-05-30 | 2019-01-08 | 四川大禹机械密封件制造有限公司 | Large arch dam easily crystallizes fluid machinery sealing device |
| CN110131417A (en) * | 2019-01-25 | 2019-08-16 | 宁波奉化明磊弹簧厂 | A kind of band water cooling single mechanical end face seal structure and its working method |
| CN110792630A (en) * | 2019-11-07 | 2020-02-14 | 南京工程学院 | Air-cooled bellows dry gas sealing device |
| CN111405163A (en) * | 2020-04-16 | 2020-07-10 | 项本霞 | Antifog camera |
| CN214247785U (en) * | 2020-12-14 | 2021-09-21 | 宁波奉化明磊弹簧厂 | Machine seal structure |
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