CN102943880A - Shaft transmission sealing system - Google Patents
Shaft transmission sealing system Download PDFInfo
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- CN102943880A CN102943880A CN2012104230075A CN201210423007A CN102943880A CN 102943880 A CN102943880 A CN 102943880A CN 2012104230075 A CN2012104230075 A CN 2012104230075A CN 201210423007 A CN201210423007 A CN 201210423007A CN 102943880 A CN102943880 A CN 102943880A
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Abstract
The invention discloses a shaft transmission sealing system which comprises a wall pipe component penetrating the wall and a transmission shaft (8) penetrating the wall pipe component, wherein a static seal device is arranged between the outer circumferential contact surfaces of a support seat (3) and a pre-buried wall pipe (16), a first dynamic seal device between the outer circumferential contact surfaces of a seal seat (7) and the support seat (3), a second static seal device between the seal seat (7) and an inner support ring (6), and a second dynamic seal device between the transmission shaft (8) and the seal seat (7), as well as between the transmission shaft (8) and the inner support ring (6). According to the invention, with the four seal devices, the sealing between stationary parts, between movable parts, and between the stationary parts and the movable parts is reliable, so as to effectively prevent radioactive harmful gas from leakage to outdoor safety area and guarantee operator's safety.
Description
Technical field
The present invention relates to a kind of transmission seal system, especially relate to a kind of driven off by shaft sealing system, be applicable to the active mechanical arm of hot cell manipulator and the sealing transmission between the slave manipulator arm.
Background technique
The hot cell is the shielded cubicle that carries out high radioactivity test and operation, and the exterior wall concrete structure of attaching most importance to affects field operation personnel's health to prevent the radioactive material in the hot cell.The squint of lead glass or high density liquid generally is housed on the front wall in hot cell, carry out remote-controlled operation by mechanism hand, the transmission shaft that runs through the wall-passing pipe assembly that moves through that is about to the outer active mechanical arm in hot cell is delivered to slave manipulator arm realization remote-controlled operation in the hot cell.
The wall-passing pipe assembly is installed on the front wall in hot cell usually, in order to prevent the radioactivity poisonous gas leakage in the hot cell, must guarantee between transmission shaft and the wall-passing pipe assembly and the sealing between each parts of wall-passing pipe assembly self reliable, with the effective control of realization to radioactivity harmful gases such as radioactivity alpha aerosols.
The existing driven off by shaft sealing system that is used for hot cell manipulator, sealing is not high, the phenomenon of radioactivity poisonous gas leakage easily occurs, thereby operator are damaged.
This shows, be badly in need of at present a kind of driven off by shaft sealing system for hot cell manipulator of design, to improve between transmission shaft and the wall-passing pipe assembly and the sealing effect between each parts of wall-passing pipe assembly self, prevent the radioactivity poisonous gas leakage, guarantee operator's safety.
Summary of the invention
Technical problem to be solved by this invention provides a kind of driven off by shaft sealing system, can guarantee the motion sealing effect between transmission shaft and the wall-passing pipe assembly, can guarantee again between static element in the wall-passing pipe assembly and the static element and the sealing effect between static element and the movement parts, avoid the radioactivity harmful gas leakages such as alpha aerosol, guaranteed operator's safety.
For solving the problems of the technologies described above, a kind of driven off by shaft sealing system of the present invention, comprise the wall-passing pipe assembly that runs through the body of wall setting and run through the transmission shaft that the wall-passing pipe assembly arranges, described wall-passing pipe assembly comprises pre-buried wall coil and supporting base, sealing seat, outer support circle and the inner support circle that is cast in the concrete wall, and supporting base runs through and is fixed in the pre-buried wall coil; The outer support circle is fixed on the supporting base, and the inner support circle rotates and is arranged in the outer support circle, and sealing seat is arranged in the supporting base and with the inner support circle and fixes; Transmission shaft runs through sealing seat and inner support circle simultaneously; Be provided with the first static seal device between the excircle surface of contact of described supporting base and pre-buried wall coil; Be provided with the first dynamic seal apparatus between the excircle surface of contact of sealing seat and supporting base; Be provided with the second static seal device between the end face of sealing seat and inner support circle; Be provided with the second dynamic seal apparatus between transmission shaft and sealing seat and the inner support circle.
Described the first static seal device is rubber seal ring, and described the second static seal device is O-ring seals, and described first, second dynamic seal apparatus is the oil sealing sealing device.
Described oil sealing sealing device is oppositely arranged face-to-face by two lip-type packings and forms.
The profile of described supporting base is the Step Shaft that the indoor side is large, the outdoor is little, and the outdoor end face of pre-buried wall coil is positioned at the outside of the step surface of supporting base, rubber seal ring is sleeved on the minor diameter outer peripheral surface of supporting base, the outdoor side of rubber seal ring is provided with pressure ring, the edge circumferentially is laid with a plurality of adjustment screws on the outdoor end face of outer support circle, by adjusting the screw in compression pressure ring indoor side end face of rubber seal ring is pressed on the step surface of supporting base, and the inwall of the outer peripheral surface of rubber seal ring and pre-buried wall coil is close to.
Described supporting base is provided with the lubricating cup for fuel feeding, and sealing seat is provided with for lubricating oil flow to the oil duct between sealing seat and the inner support circle opposing end surface; The entrance of oil duct is arranged on the outer peripheral surface of sealing seat and two lip-type packings of the first dynamic seal apparatus lay respectively at the entrance both sides of oil duct; Two lip-type packings in the second dynamic seal apparatus are separately positioned on sealing seat and the inner support circle.
The outer peripheral surface of described rubber seal ring is provided with the ring-type sawtooth.
Be provided with a plurality of steel balls between the excircle surface of contact of described inner support circle and outer support circle.
Described transmission shaft rotates by bearing and is arranged on the inner support circle.
Driven off by shaft sealing system of the present invention is provided with the sealing of four roads altogether, and the first sealing is arranged on the first static seal device between supporting base and the pre-buried wall coil; The second sealing is arranged on the first dynamic seal apparatus between supporting base and the sealing seat; Three seals is arranged on the second dynamic seal apparatus between sealing seat and inner support circle and the transmission shaft; The sealing of the 4th road is arranged on the second static seal device between sealing seat and the inner support circle end face.By the sealing of above-mentioned four roads, guaranteed simultaneously between static element and the static element, between static element and the movement parts and the sealing between movement parts and the movement parts reliable, effectively stop the radioactivity harmful gas to be leaked to outdoor safety zone, guaranteed operator's safety.
As a kind of improvement of the present invention, described oil sealing sealing device is oppositely arranged face-to-face by two lip-type packings and forms, stoped radioactivity harmful gas or lubricant oil from indoor to outdoor leakage on the one hand, also can stop on the other hand outdoor impurity to enter the inside of wall-passing pipe assembly from the gap between inner support circle and the outer support circle, when having guaranteed sealing effect, also guaranteed the flexibility of rotating.
As another kind of improvement the of the present invention, the outdoor side of described rubber seal ring is provided with pressure ring, and the edge circumferentially is laid with a plurality of adjustment screws on the outdoor end face of outer support circle, change the distortion of rubber seal ring by adjusting screw, and then the adjusting sealing effect, easy to adjust, and good sealing effect.
As another kind of improvement the of the present invention, described supporting base is provided with lubricating cup, sealing seat is provided with oil duct, two lip-type packings in the first dynamic seal apparatus lay respectively at the both sides of oil duct entrance, and two lip-type packings in the second dynamic seal apparatus are separately positioned on sealing seat and the inner support circle.Like this, the lubricant oil in the lubricating cup flows between two lip-type packings in the first dynamic seal apparatus, for it provides lubricated; Simultaneously, oil duct and gap sealing seat and inner support circle end face between of lubricant oil on sealing seat flows between two lip-type packings in the second dynamic seal apparatus, for it provides lubricated, both provided lubricated for first, second seal arrangement, play again the effect of sealing, can also prevent outflow of lubrication oil.
As another kind of improvement the of the present invention, the outer peripheral surface of described rubber seal ring is provided with the ring-type sawtooth, and the ring-type sawtooth is out of shape in the pressurized situation, has improved sealing effect.
Description of drawings
Fig. 1 is that active mechanical arm outside the hot cell and the slave manipulator arm in the hot cell are by the schematic diagram of transmission shaft connection for transmission;
Fig. 2 is a kind of embodiment structural representation of driven off by shaft sealing system provided by the present invention;
Among the figure: 1-lubricating cup, 2-pressure ring, 3-supporting base, 4-outer support circle, 5-steel ball, 6-inner support circle, the 7-sealing seat, 8-transmission shaft, 9-bearing, 10-the second oil sealing group, the 11-O RunddichtringO, 12-adjusts screw, 13-the first oil sealing group, 14-rubber seal ring, 15-body of wall, the pre-buried wall coil of 16-, 17-is sleeve pipe within the walls.
Embodiment
Driven off by shaft sealing system of the present invention, be mainly used in outside the hot cell being in transmission connection of slave manipulator arm in the active mechanical arm and hot cell, be provided with the sealing of four roads in this driven off by shaft sealing system, effectively stoped the radioactive air leakages such as alpha aerosol, thereby guaranteed operator's safety.Below in conjunction with Figure of description and specific embodiment the present invention is further detailed.
Understanding for the ease of those skilled in the art, the leak path of radioactivity harmful gas at first is described in conjunction with Fig. 1, Fig. 1 is that active mechanical arm outside the hot cell and the slave manipulator arm in the hot cell are by the schematic diagram of transmission shaft connection for transmission, as shown in Figure 1, pre-buried wall coil 16 is cast in the concrete wall 15, supporting base 3 runs through and is fixed in the pre-buried wall coil 16, outer support circle 4 is fixed on the outdoor end face of supporting base 3 by a plurality of screws, sealing seat 7 is arranged in the supporting base 3, inner support circle 6 rotates by a plurality of steel balls 5 and is arranged in the outer support circle 4, sealing seat 7 is provided with the gap and is bolted between the opposing end surface of inner support circle 6, sealing seat 7 is rotated with inner support circle 6.Transmission shaft 8 runs through sealing seat 7 and inner support circle 6 simultaneously, and and inner support circle 6 between be provided with bearing 9, make the transmission shaft 8 can flexible rotating.Among the figure, the left side of transmission shaft 8 is the indoor pollution zone, and the right side is outdoor safety zone, and by said structure as can be known, the path of leaking that dusty gas is possible has following several:
Article 1, the path of leaking: dusty gas enters from A (the end face junction, indoor side of pre-buried wall coil 16 and supporting base 3 in the Polluted area), and the gap between pre-buried wall coil 16 and supporting base 3 excircle surface of contact is leaked to outdoor safety zone;
Article 2, the path of leaking: dusty gas enters from B (the end face junction, indoor side of supporting base 3 and sealing seat 7 in the Polluted area), gap between gap, supporting base 3 and sealing seat 7 opposing end surfaces between supporting base 3 and the sealing seat 7 excircle surface of contact, and the gap between sealing seat 7 and the transmission shaft 8 is leaked to outdoor safety zone;
By above-mentioned analysis as can be known, in order to prevent the radioactivity poisonous gas leakage in the hot cell, must effectively cut off the approach of above-mentioned four radioactivity poisonous gas leakages, for this reason, the invention provides a kind of driven off by shaft sealing system.
See also Fig. 2, Fig. 2 is a kind of embodiment structural representation of driven off by shaft sealing system provided by the present invention, and the described driven off by shaft sealing system of embodiment comprises the wall-passing pipe assembly that runs through hot cell body of wall setting and runs through the transmission shaft 8 that the wall-passing pipe assembly arranges.
The wall-passing pipe assembly comprises pre-buried wall coil 16, supporting base 3, sealing seat 7, outer support circle 4 and inner support circle 6, pre-buried wall coil 16 is cast in the concrete wall 15 and runs through this body of wall 15, supporting base 3 runs through and is fixed in the pre-buried wall coil 16, outer support circle 4 is fixed on the supporting base 3 by a plurality of screws, and pre-buried wall coil 16, supporting base 3 and outer support circle 4 threes keep static.The profile of supporting base 3 is that the indoor side is large, the Step Shaft that the outdoor is little, and the outdoor end face of pre-buried wall coil 16 is positioned at the outside of the step surface of supporting base 3, be set with successively a rubber seal ring 14 and a pressure ring 2 on the minor diameter outer peripheral surface of supporting base 3 to the outdoor from the indoor side, the edge circumferentially is laid with a plurality of adjustment screws 12 on the outdoor end face of outer support circle 4, by adjusting screw 12 compression pressure rings 2 the indoor side end face of rubber seal ring 14 is pressed on the step surface of supporting base 3, simultaneously, after rubber seal ring 14 distortion, the inwall of its outer peripheral surface and pre-buried wall coil 16 is close to, thereby has cut off the 1st path of leaking of radioactivity harmful gas.The outer peripheral surface of rubber seal ring 14 is provided with the ring-type sawtooth, and the ring-type sawtooth can provide more great distortion in the pressurized situation, has further improved the effect of sealing.
Be provided with the first dynamic seal apparatus between the excircle surface of contact of sealing seat 7 and supporting base 3, be provided with the second dynamic seal apparatus between transmission shaft 8 and sealing seat 7 and the inner support circle 6, the first dynamic seal apparatus is specially the first oil sealing group 13, the second dynamic seal apparatuss and is specially the second oil sealing group 10.
The outer peripheral surface of supporting base 3 is provided with the lubricating cup 1 for fuel feeding, sealing seat 7 is provided with for lubricating oil flow to the oil duct between sealing seat 7 and inner support circle 6 opposing end surfaces, the first oil sealing group 13 is oppositely arranged face-to-face by two lip-type packings and forms, the entrance of oil duct is arranged on the outer peripheral surface of sealing seat 7 and two lip-type packings of the first oil sealing group 13 lay respectively at the entrance both sides of oil duct, lip-type packing towards inner support circle 6 is indoor for stoping dusty gas leakage and lubricant oil to flow to, and the lip-type packing of inner support circle 6 stops intrusion and the lubricant oil of dust foreign material to flow to outdoor dorsad.Under free state, the internal diameter of lip-type packing is less than the external diameter of sealing seat 7, the external diameter of lip-type packing is larger than the internal diameter of supporting base 3, certain magnitude of interference is all arranged, after lip-type packing is installed, the contractile force of the pressure of its lip and self-tightening spring produces certain radially enclasping force, and the gap is revealed in blocking-up, reaches the purpose of sealing.Cut off the 4th path of leaking of radioactivity harmful gas by the first oil sealing group 13.
Being arranged on the second oil sealing group 10 on the transmission shaft 8 also is oppositely arranged face-to-face by two lip-type packings and forms, two lip-type packings lay respectively at and are arranged on sealing seat 7 and the inner support circle 6, and two lip-type packings lay respectively at the both sides in the gap between supporting base 3 and sealing seat 7 opposing end surfaces, by the second oil sealing group 10, cut off the 3rd path of leaking of radioactivity harmful gas.
Supporting base 3 is provided with O RunddichtringO 11 with sealing seat 7 opposing end surfaces.
So, be that the lubricating oil path of the first oil sealing group 13 and the second oil sealing group 10 is: the gap between lubricating cup 1-oil duct-sealing seat 7 and the inner support circle 6 among the present invention.Wherein, lubricant oil in the lubricating cup 1 directly is the first oil sealing group 13 fuel feeding, simultaneously, the gap of the lubricant oil in the lubricating cup 1 between oil duct and supporting base 3 and sealing seat 7 opposing end surfaces is the second oil sealing group 10 fuel feeding, and O RunddichtringO 11 has then cut off the 2nd path of leaking of radioactivity harmful gas.
In sum, driven off by shaft sealing system provided by the invention, pre-buried wall coil 16, supporting base 3 and outer support circle 4 threes keep static, are static element; Sealing seat 7 can rotate with respect to supporting base 3, inner support circle 6 can rotate with respect to outer support circle 4, transmission shaft 8 can rotate with respect to sealing seat 7, and therefore, sealing seat 7, inner support circle 6 and transmission shaft 8 are movement parts.The present invention is provided with the sealing of four roads altogether, and the first sealing is arranged on the first static seal device between supporting base 3 and the pre-buried wall coil 16, realizes by rubber seal ring; The second sealing is arranged on the first dynamic seal apparatus between supporting base 3 and the sealing seat 7, realizes by a pair of oil sealing; Three seals is arranged on the second dynamic seal apparatus between sealing seat 7 and inner support circle 6 and the transmission shaft, realizes by a pair of oil sealing; The sealing of the 4th road is arranged on the second static seal device between sealing seat 7 and inner support circle 6 end faces, realizes by the O RunddichtringO.By the sealing of above-mentioned four roads, guaranteed simultaneously by (between pre-buried wall coil 16 and the supporting base 3) between static element and the static element, between static element and the movement parts (between supporting base 3 and the sealing seat 7 and between sealing seat 7 and the outer support circle 4), the sealing of (between sealing seat 7 and the inner support circle 6 and between inner support circle 6 and the transmission shaft 8) is reliable between movement parts and the movement parts, effectively stoped the radioactivity harmful gas between pre-buried wall coil 16 and the supporting base 3, between sealing seat 7 and the supporting base 3, between sealing seat 7 and the outer support circle 4, between sealing seat 7 and the inner support the circle 6 and gap between inner support circle 6 and the transmission shaft 8 is leaked to outdoor safety zone, thereby has guaranteed operator's safety.
Above-mentioned driven off by shaft sealing system only is illustrated for a transmission shaft, during practical application, can realize simultaneously according to said structure principle and sealing principle the sealing of many coupling shafts.In addition, this technological scheme is not only applicable to the sealing of host and slave processors tool hand transmission shaft driven, utilizes connection for transmission and needs the field of sealing all applicable for other.
Device of the present invention is not limited to the embodiment described in the embodiment, so long as those skilled in the art's technological scheme according to the present invention draws other mode of execution, belongs to equally the scope of technological innovation of the present invention and protection.
Claims (8)
1. a driven off by shaft sealing system comprises the wall-passing pipe assembly that runs through the body of wall setting and runs through the transmission shaft (8) that the wall-passing pipe assembly arranges, and it is characterized in that:
Described wall-passing pipe assembly comprises pre-buried wall coil (16) and supporting base (3), sealing seat (7), outer support circle (4) and the inner support circle (6) that is cast in the concrete wall, and supporting base (3) runs through and is fixed in the pre-buried wall coil (16); Outer support circle (4) is fixed on the supporting base (3), and inner support circle (6) is arranged in the outer support circle (4), and sealing seat (7) is arranged in the supporting base (3) and with inner support circle (6) and fixes; Transmission shaft (8) runs through sealing seat (7) and inner support circle (6) simultaneously;
Be provided with the first static seal device between the excircle surface of contact of described supporting base (3) and pre-buried wall coil (16); Be provided with the first dynamic seal apparatus between the excircle surface of contact of sealing seat (7) and supporting base (3); Be provided with the second static seal device between the end face of sealing seat (7) and inner support circle (6); Be provided with the second dynamic seal apparatus between transmission shaft (8) and sealing seat (7) and the inner support circle (6).
2. a kind of driven off by shaft sealing system as claimed in claim 1 is characterized in that:
Described the first static seal device is rubber seal ring, and described the second static seal device is O-ring seals, and described first, second dynamic seal apparatus is the oil sealing sealing device.
3. a kind of driven off by shaft sealing system as claimed in claim 2 is characterized in that:
Described oil sealing sealing device is oppositely arranged face-to-face by two lip-type packings and forms.
4. a kind of driven off by shaft sealing system as claimed in claim 2 is characterized in that:
The profile of described supporting base (3) is that the indoor side is large, the Step Shaft that the outdoor is little, and the outdoor end face of pre-buried wall coil (16) is positioned at the outside of the step surface of supporting base (3), rubber seal ring is sleeved on the minor diameter outer peripheral surface of supporting base (3), the outdoor side of rubber seal ring is provided with pressure ring (2), the edge circumferentially is laid with a plurality of adjustment screws (12) on the outdoor end face of outer support circle (4), by adjusting screw (12) compression pressure ring (2) the indoor side end face of rubber seal ring is pressed on the step surface of supporting base (3), and the inwall of the outer peripheral surface of rubber seal ring and pre-buried wall coil (16) is close to.
5. a kind of driven off by shaft sealing system as claimed in claim 3 is characterized in that:
Described supporting base (3) is provided with the lubricating cup (1) for fuel feeding, and sealing seat (7) is provided with for lubricating oil flow to the oil duct between sealing seat (7) and inner support circle (6) opposing end surface; The entrance of oil duct is arranged on the outer peripheral surface of sealing seat (7) and two lip-type packings of the first dynamic seal apparatus lay respectively at the entrance both sides of oil duct; Two lip-type packings in the second dynamic seal apparatus are separately positioned on sealing seat (7) and the inner support circle (6).
6. a kind of driven off by shaft sealing system as claimed in claim 2 is characterized in that:
The outer peripheral surface of described rubber seal ring is provided with the ring-type sawtooth.
7. a kind of driven off by shaft sealing system as claimed in claim 1 is characterized in that: be provided with a plurality of steel balls (5) between the excircle surface of contact of described inner support circle (6) and outer support circle (4).
8. a kind of driven off by shaft sealing system as claimed in claim 1 is characterized in that: described transmission shaft (8) rotates by bearing (9) and is arranged on the inner support circle (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210423007.5A CN102943880B (en) | 2012-10-30 | 2012-10-30 | Shaft transmission sealing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210423007.5A CN102943880B (en) | 2012-10-30 | 2012-10-30 | Shaft transmission sealing system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102943880A true CN102943880A (en) | 2013-02-27 |
| CN102943880B CN102943880B (en) | 2015-06-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210423007.5A Active CN102943880B (en) | 2012-10-30 | 2012-10-30 | Shaft transmission sealing system |
Country Status (1)
| Country | Link |
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| CN (1) | CN102943880B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105065676A (en) * | 2015-07-29 | 2015-11-18 | 山东浩信机械有限公司 | Wheel hub unit |
| CN105904446A (en) * | 2016-07-07 | 2016-08-31 | 成都航天烽火精密机电有限公司 | Automatic balancing type manipulator |
| CN108397493A (en) * | 2017-02-08 | 2018-08-14 | 株式会社椿本链条 | One-way clutch |
| CN108974811A (en) * | 2018-07-18 | 2018-12-11 | 中国核电工程有限公司 | A kind of α waste transfer device in hot cell and maintenance section |
| CN109812582A (en) * | 2019-01-31 | 2019-05-28 | 武汉船用机械有限责任公司 | Double containment lip rotary sealing appts |
| CN111701523A (en) * | 2020-06-28 | 2020-09-25 | 中国兵器装备集团自动化研究所 | Kneading safety transmission device |
| CN112728048A (en) * | 2021-01-05 | 2021-04-30 | 埃夫特智能装备股份有限公司 | Sealing structure and robot |
| CN114135648A (en) * | 2021-11-09 | 2022-03-04 | 中国核电工程有限公司 | Sealing power penetration assembly, sealing power penetration structure and construction method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105065676A (en) * | 2015-07-29 | 2015-11-18 | 山东浩信机械有限公司 | Wheel hub unit |
| CN105904446A (en) * | 2016-07-07 | 2016-08-31 | 成都航天烽火精密机电有限公司 | Automatic balancing type manipulator |
| CN108397493A (en) * | 2017-02-08 | 2018-08-14 | 株式会社椿本链条 | One-way clutch |
| CN108974811A (en) * | 2018-07-18 | 2018-12-11 | 中国核电工程有限公司 | A kind of α waste transfer device in hot cell and maintenance section |
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| CN109812582A (en) * | 2019-01-31 | 2019-05-28 | 武汉船用机械有限责任公司 | Double containment lip rotary sealing appts |
| CN111701523A (en) * | 2020-06-28 | 2020-09-25 | 中国兵器装备集团自动化研究所 | Kneading safety transmission device |
| CN112728048A (en) * | 2021-01-05 | 2021-04-30 | 埃夫特智能装备股份有限公司 | Sealing structure and robot |
| CN112728048B (en) * | 2021-01-05 | 2024-04-30 | 埃夫特智能装备股份有限公司 | Sealing structure and robot |
| CN114135648A (en) * | 2021-11-09 | 2022-03-04 | 中国核电工程有限公司 | Sealing power penetration assembly, sealing power penetration structure and construction method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102943880B (en) | 2015-06-03 |
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