CN104197013A - Small-connecting-pipe mechanical sealing structure and sealing method - Google Patents
Small-connecting-pipe mechanical sealing structure and sealing method Download PDFInfo
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- CN104197013A CN104197013A CN201410463330.4A CN201410463330A CN104197013A CN 104197013 A CN104197013 A CN 104197013A CN 201410463330 A CN201410463330 A CN 201410463330A CN 104197013 A CN104197013 A CN 104197013A
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- small takeover
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Abstract
The invention relates to a small-connecting-pipe mechanical sealing structure which comprises a bolt, a self-tightening assembly, a port sealing assembly and a nut. The bolt is vertically arranged at the inner top end of a small connecting pipe with the bolt head located at the lower side, and a threaded end is located on the upper side; the self-tightening assembly sleeves the bolt and is located above the bolt head; the port sealing assembly sleeves the bolt and is arranged at the position of the port of the small connecting pipe, and the lower surface of the port sealing assembly is in contact with the self-tightening assembly; the nut sleeves the bolt and is located above the port sealing assembly, the port of the small connecting pipe is sealed by screwing of the nut, and the small-connecting-pipe mechanical sealing structure is fastened on the inner wall of the small connecting pipe. The invention further provides a sealing method utilizing the small-connecting-pipe mechanical sealing structure to seal. The small-connecting-pipe mechanical sealing structure is simple in structure, good in popularity and convenient to assemble and disassemble; by the self-tightening structure, sealing effect is good, and other special assisting devices are not needed.
Description
Technical field
The present invention relates to a kind of mechanical seal structure and encapsulating method, refer in particular to a kind of mechanical seal structure and encapsulating method that is applicable to small takeover, belong to boiler, pressurized container, nuclear power pressure equipment technical field.
Background technique
In prior art, the blunt end part that is not more than 80mm for steam generator instrument nozzle or blowdown connection uniform internal diameter is taken over, and is generally referred to as small takeover, and it mainly adopts welding and two kinds of forms of mechanical seal in the time filling nitrogen low pressure seal.
If adopt the mode of welding to seal, sealing effect is very good, but brings inconvenience to dismounting and the processing at installation scene.Therefore the mode that remains mechanical seal generally adopting at present.
But, if adopt mechanical seal, in seal process, be difficult to find fastening stress area, if force area is arranged on the outer wall of small takeover, generally need on this outer wall, in addition stressed boss be set again, therefore can destroy original joint pipe structure.And the restriction that is subject to taking over original structure, on the more difficult inwall that is arranged on small takeover in fastening force area, and the inner wall space structure of small takeover also inconvenience force area is set and carries out corresponding operating; Meanwhile, operation also needs to bear the drop risk of internal tank of finding like this.
Summary of the invention
The object of this invention is to provide a kind of small takeover mechanical seal structure and encapsulating method, simple in structure, versatility is good, easy accessibility; Adopt independent self-tightening structure, good sealing effect, without other special auxiliary devices.
For achieving the above object, the invention provides a kind of small takeover mechanical seal structure, it comprises: bolt, it is vertically set on the inner tip of small takeover, and the bolt head of this bolt be positioned at below, threaded end be positioned at top; Self-tightening assembly, it is set on described bolt, and is positioned at described bolt head top; Port sealing component, it is set on described bolt, and is arranged on the port of described small takeover, and the lower surface of this port sealing component contacts with described self-tightening assembly; Nut, it is set on described bolt, and is positioned at the top of described port sealing component, realizes the sealing to small takeover port, and this small takeover mechanical seal structure is fastened on small takeover inwall by fastening nut.
Described self-tightening assembly comprises: the first pad, and it is set on described bolt, and is positioned at described bolt head top, and the lower surface of this first pad contacts with described bolt head; Rubber washer, it is set on described bolt, and is positioned at the first described pad top, and the lower surface of this rubber washer contacts with the first described pad; Retainer ring, it is set on described bolt, and is positioned at described rubber washer top, and the lower surface of this retainer ring contacts with described rubber washer.
Described port sealing component comprises: access flap, and it is set on described bolt, and is arranged on the port of described small takeover, and the lower surface of this access flap contacts with described retainer ring; On described access flap, be provided with groove; The second pad, it is arranged in the groove of described access flap, and the lower surface of this second pad contacts with the port end face of small takeover.
The second described pad adopts rubber material to make.
The end of the threaded end of described bolt offers cross through hole.
Described small takeover mechanical seal structure also comprises cotter pin, and it is arranged in the cross through hole of described bolt, and is positioned at the top of described nut.
The present invention also provides a kind of method of utilizing above-mentioned small takeover mechanical seal structure to seal, and it comprises following steps:
S1, bolt is vertically inverted, is made its bolt head be positioned at below, threaded end is positioned at top; On bolt, be inserted in successively the first pad, rubber washer and retainer ring, and bolt put into small takeover inside under free state;
S2, in the cross through hole of the threaded end end of bolt, penetrate cord and fasten;
S3, the second pad is packed in the groove of access flap, and by the second pad the port towards small takeover, access flap is enclosed within on described bolt, the lower surface of the second pad and the port end face of small takeover are contacted;
S4, on described bolt, screw in nut, make it to touch the upper surface of access flap, make the second pad contact all the time the port end face of small takeover;
S5, the fastening nut that keeps, make the second packing ring contact and be subject to impacting force with port end face and the access flap of small takeover respectively, and the port of small takeover is played to seal action; Simultaneously, this impacting force is delivered to retainer ring from access flap, make rubber washer between retainer ring and the first pad, constantly be subject to impacting force and produce dilatancy, until the rubber washer after distortion contacts and produce friction self-tightening power with the inwall of small takeover, the fastening force area of whole sealing configuration is acted on the inwall of small takeover.
Also comprise step S6 after described step S5: take off cord, and pack cotter pin in the cross through hole of the threaded end end of bolt, this cotter pin is positioned at the top of nut.
Small takeover mechanical seal structure of the present invention and encapsulating method, in the time filling nitrogen transport, it is carried out to mechanical seal for nuclear steam generator small takeover, it has the following advantages: 1, simple in structure, versatility is good, with low cost, after fastening nut, by the second pad, small takeover port is sealed, good sealing effect, does not need the seal elements such as O type circle; 2, produce frictional force by the dilatancy of rubber washer and the inwall of small takeover and carry out fasteningly, realized the independent self-tightening of whole sealing configuration; And carry out pretension by fastening nut, stressed system easy to control in size, difficult drop-off; Do not need the special stressed securing meanss such as crossbeam, clip, boss; 3, by the applying and discharge the dismounting operation that realizes sealing configuration of nut pretightening force, simple and convenient; 4, only have rubber washer to contact with small takeover with the second pad, avoided the carbon steel element contact small takeover bodies such as bolt, therefore avoided the pollution to small takeover.
Brief description of the drawings
Fig. 1 is the schematic diagram of small takeover mechanical seal structure provided by the invention.
Embodiment
Below in conjunction with Fig. 1, describe a preferred embodiment of the present invention in detail.
As shown in Figure 1, small takeover mechanical seal structure provided by the present invention, it comprises: bolt 1, it is vertically set on the inner tip of small takeover 10, and the bolt head of this bolt 1 be positioned at below, threaded end be positioned at top; In the present embodiment, described bolt 1 adopts hexagon head bolt; Self-tightening assembly, it is set on described bolt 1, and is positioned at described bolt head top; Port sealing component, it is set on described bolt 1, and is arranged on the port of described small takeover 10, and the lower surface of this port sealing component contacts with described self-tightening assembly; Nut 7, it is set on described bolt 1, and is positioned at the top of described port sealing component, realizes the sealing to small takeover port, and this small takeover mechanical seal structure is fastened on the inwall of small takeover 10 by fastening nut 7.
Described self-tightening assembly comprises: the first pad 2, and it is set on described bolt 1, and is positioned at described bolt head top, and the lower surface of this first pad 2 contacts with described bolt head; Rubber washer 3, it is set on described bolt 1, and is positioned at the first described pad 2 tops, and the lower surface of this rubber washer 3 contacts with the first described pad 2; Retainer ring 4, it is set on described bolt 1, and is positioned at described rubber washer 3 tops, and the lower surface of this retainer ring 4 contacts with described rubber washer 3.
Described port sealing component comprises: access flap 5, and it is set on described bolt 1, and is arranged on the port of described small takeover 10, and the lower surface of this access flap 5 contacts with described retainer ring 4; On described access flap 5, be provided with groove; The second pad 6, it is arranged in the groove of described access flap 5, and the lower surface of this second pad 6 contacts with the port end face of small takeover 10.
The second described pad 6 adopts rubber material to make.
The end of the threaded end of described bolt 1 offers cross through hole.
Described small takeover mechanical seal structure also comprises cotter pin 8, and it is arranged in the cross through hole of described bolt 1, and is positioned at the top of described nut 7, to prevent that nut 7 from coming off.
The present invention also provides a kind of method of utilizing above-mentioned small takeover mechanical seal structure to seal, and it comprises following steps:
S1, bolt 1 is vertically inverted, is made its bolt head be positioned at below, threaded end is positioned at top; On bolt 1, be inserted in successively the first pad 2, rubber washer 3 and retainer ring 4, and bolt 1 put into small takeover 10 inside under free state;
S2, in the cross through hole of the threaded end end of bolt 1, penetrate cord and fasten, holding cord and prevent from bolt 1 and be set in the first pad 2, rubber washer 3 and retainer ring 4 on described bolt 1 falling into the inside of small takeover 10;
S3, the second pad 6 is packed in the groove of access flap 5, and by the second pad 6 port towards small takeover 10, access flap 5 is enclosed within on described bolt 1, the lower surface of the second pad 6 and the port end face of small takeover 10 are contacted;
S4, on described bolt 1, screw in nut 7, make it to touch the upper surface of access flap 5, make the second pad 6 contact all the time the port end face of small takeover 10;
S5, the fastening nut 7 that keeps, make the second packing ring 6 contact and be subject to impacting force with port end face and the access flap 5 of small takeover 10 respectively, and the port of small takeover 10 is played to seal action; Simultaneously, this impacting force is delivered to retainer ring 4 from access flap 5, make rubber washer 3 constantly be subject to impacting force and produce dilatancy between retainer ring 4 and the first pad 2, until the rubber washer 3 after distortion contacts and produce friction self-tightening power with the inwall of small takeover 10, the fastening force area of whole sealing configuration is acted on the inwall of small takeover 10.
Also comprise step S6 after described step S5: take off cord, and pack cotter pin 8 in the cross through hole of the threaded end end of bolt 1, this cotter pin 8 is positioned at the top of nut 7, to prevent that nut 7 from coming off.
Small takeover mechanical seal structure of the present invention and encapsulating method, in the time of fastening nut more 7, the impacting force that is delivered to retainer ring 4 is just larger, rubber washer 3 more expands, rubber washer 3 is also larger with the interior wall friction self-tightening power of small takeover 10, just more fastening being arranged in small takeover 10 of whole sealing configuration; Now the sealing impacting force of the port end face of the second pad 6 to small takeover 10 is also larger, and whole sealability is also just better.Otherwise, if come up nut 7, can unload whole sealing configuration and take out from small takeover 10.
Small takeover mechanical seal structure of the present invention and encapsulating method, in the time filling nitrogen transport, it is carried out to mechanical seal for nuclear steam generator small takeover, it has the following advantages: 1, simple in structure, versatility is good, with low cost, after fastening nut, by the second pad, small takeover port is sealed, good sealing effect, does not need the seal elements such as O type circle; 2, produce frictional force by the dilatancy of rubber washer and the inwall of small takeover and carry out fasteningly, realized the independent self-tightening of whole sealing configuration; And carry out pretension by fastening nut, stressed system easy to control in size, difficult drop-off; Do not need the special stressed securing meanss such as crossbeam, clip, boss; 3, by the applying and discharge the dismounting operation that realizes sealing configuration of nut pretightening force, simple and convenient; 4, only have rubber washer to contact with small takeover with the second pad, avoided the carbon steel element contact small takeover bodies such as bolt, therefore avoided the pollution to small takeover.
Although content of the present invention has been done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to limitation of the present invention.Read after foregoing those skilled in the art, for multiple amendment of the present invention and substitute will be all apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (8)
1. a small takeover mechanical seal structure, is characterized in that, comprises:
Bolt (1), it is vertically set on the inner tip of small takeover (10), and the bolt head of this bolt (1) be positioned at below, threaded end be positioned at top;
Self-tightening assembly, it is upper that it is set in described bolt (1), and be positioned at described bolt head top;
Port sealing component, it is upper that it is set in described bolt (1), and be arranged on the port of described small takeover (10), and the lower surface of this port sealing component contacts with described self-tightening assembly;
Nut (7), it is upper that it is set in described bolt (1), and be positioned at the top of described port sealing component, realizes the sealing to small takeover port, and this small takeover mechanical seal structure is fastened on the inwall of small takeover (10) by fastening nut (7).
2. small takeover mechanical seal structure as claimed in claim 1, is characterized in that, described self-tightening assembly comprises:
The first pad (2), it is upper that it is set in described bolt (1), and be positioned at described bolt head top, and the lower surface of this first pad (2) contacts with described bolt head;
Rubber washer (3), it is upper that it is set in described bolt (1), and be positioned at described the first pad (2) top, and the lower surface of this rubber washer (3) contacts with described the first pad (2);
Retainer ring (4), it is upper that it is set in described bolt (1), and be positioned at described rubber washer (3) top, and the lower surface of this retainer ring (4) contacts with described rubber washer (3).
3. small takeover mechanical seal structure as claimed in claim 2, is characterized in that, described port sealing component comprises:
Access flap (5), it is upper that it is set in described bolt (1), and be arranged on the port of described small takeover (10), and the lower surface of this access flap (5) contacts with described retainer ring (4); On described access flap (5), be provided with groove;
The second pad (6), it is arranged in the groove of described access flap (5), and the lower surface of this second pad (6) contacts with the port end face of small takeover (10).
4. small takeover mechanical seal structure as claimed in claim 3, is characterized in that, described the second pad (6) adopts rubber material to make.
5. small takeover mechanical seal structure as claimed in claim 1, is characterized in that, the end of the threaded end of described bolt (1) offers cross through hole.
6. small takeover mechanical seal structure as claimed in claim 5, is characterized in that, described small takeover mechanical seal structure also comprises cotter pin (8), and it is arranged in the cross through hole of described bolt (1), and is positioned at the top of described nut (7).
7. a method of utilizing the small takeover mechanical seal structure described in above-mentioned arbitrary claim to seal, is characterized in that, comprises following steps:
S1, bolt (1) is vertically inverted, is made its bolt head be positioned at below, threaded end is positioned at top; On bolt (1), be inserted in successively the first pad (2), rubber washer (3) and retainer ring (4), and bolt (1) put into small takeover (10) inside under free state;
S2, in the cross through hole of the threaded end end of bolt (1), penetrate cord and fasten;
S3, the second pad (6) is packed in the groove of access flap (5), and by the second pad (6) port towards small takeover (10), access flap (5) is enclosed within to described bolt (1) upper, the lower surface of the second pad (6) is contacted with the port end face of small takeover (10);
S4, at the upper nut (7) that screws in of described bolt (1), make it to touch the upper surface of access flap (5), make the second pad (6) contact all the time the port end face of small takeover (10);
S5, the fastening nut that keeps (7), make the second packing ring (6) contact and be subject to impacting force with port end face and the access flap (5) of small takeover (10) respectively, and the port of small takeover (10) is played to seal action; Simultaneously, this impacting force is delivered to retainer ring (4) from access flap (5), make rubber washer (3) constantly be subject to impacting force and produce dilatancy between retainer ring (4) and the first pad (2), until the rubber washer (3) after distortion contacts and produce friction self-tightening power with the inwall of small takeover (10), the fastening force area of whole sealing configuration is acted on the inwall of small takeover (10).
8. encapsulating method as claimed in claim 7, it is characterized in that, also comprise step S6 after described step S5: take off cord, and pack cotter pin (8) in the cross through hole of the threaded end end of bolt (1), this cotter pin (8) is positioned at the top of nut (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410463330.4A CN104197013A (en) | 2014-09-12 | 2014-09-12 | Small-connecting-pipe mechanical sealing structure and sealing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410463330.4A CN104197013A (en) | 2014-09-12 | 2014-09-12 | Small-connecting-pipe mechanical sealing structure and sealing method |
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| Publication Number | Publication Date |
|---|---|
| CN104197013A true CN104197013A (en) | 2014-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410463330.4A Pending CN104197013A (en) | 2014-09-12 | 2014-09-12 | Small-connecting-pipe mechanical sealing structure and sealing method |
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| Country | Link |
|---|---|
| CN (1) | CN104197013A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2575406Y (en) * | 2002-08-26 | 2003-09-24 | 胡新桥 | Lubricating device for concrete convey pump |
| CN201351789Y (en) * | 2008-12-25 | 2009-11-25 | 中国北车集团大连机车车辆有限公司 | Sealing plug capable of expanding at pipe opening |
| CN203548898U (en) * | 2013-09-30 | 2014-04-16 | 贵州黎阳航空动力有限公司 | Hole sealing device |
| CN204083218U (en) * | 2014-09-12 | 2015-01-07 | 上海电气核电设备有限公司 | Small takeover mechanical seal structure |
-
2014
- 2014-09-12 CN CN201410463330.4A patent/CN104197013A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2575406Y (en) * | 2002-08-26 | 2003-09-24 | 胡新桥 | Lubricating device for concrete convey pump |
| CN201351789Y (en) * | 2008-12-25 | 2009-11-25 | 中国北车集团大连机车车辆有限公司 | Sealing plug capable of expanding at pipe opening |
| CN203548898U (en) * | 2013-09-30 | 2014-04-16 | 贵州黎阳航空动力有限公司 | Hole sealing device |
| CN204083218U (en) * | 2014-09-12 | 2015-01-07 | 上海电气核电设备有限公司 | Small takeover mechanical seal structure |
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| PB01 | Publication | ||
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| RJ01 | Rejection of invention patent application after publication | ||
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Application publication date: 20141210 |