CN113685425A - Bolt sealing structure and pressure container of high-flux engineering test reactor - Google Patents

Bolt sealing structure and pressure container of high-flux engineering test reactor Download PDF

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Publication number
CN113685425A
CN113685425A CN202110993572.4A CN202110993572A CN113685425A CN 113685425 A CN113685425 A CN 113685425A CN 202110993572 A CN202110993572 A CN 202110993572A CN 113685425 A CN113685425 A CN 113685425A
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China
Prior art keywords
bolt
flange
main
washer
main bolt
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Pending
Application number
CN202110993572.4A
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Chinese (zh)
Inventor
周高斌
王小彬
罗英
杜华
李玉光
杨立才
邱天
董元元
杨敏
张亚斌
马姝丽
陈海波
邱阳
杨志海
尹祁伟
谢国福
付强
郑浩
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Nuclear Power Institute of China
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Nuclear Power Institute of China
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Application filed by Nuclear Power Institute of China filed Critical Nuclear Power Institute of China
Priority to CN202110993572.4A priority Critical patent/CN113685425A/en
Publication of CN113685425A publication Critical patent/CN113685425A/en
Pending legal-status Critical Current

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    • 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
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B43/00—Washers or equivalent devices; Other devices for supporting bolt-heads or nuts
    • 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
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B43/00—Washers or equivalent devices; Other devices for supporting bolt-heads or nuts
    • F16B43/001—Washers or equivalent devices; Other devices for supporting bolt-heads or nuts for sealing or insulation

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pressure Vessels And Lids Thereof (AREA)

Abstract

The invention discloses a novel bolt sealing structure of an austenitic stainless steel flange for a high-flux test reactor, which comprises a lower flange, an upper flange, a main bolt and a fastener matched with the main bolt, wherein the first end of the main bolt is fixedly connected with the lower flange, the upper flange is provided with a through hole corresponding to the main bolt, and the second end of the main bolt penetrates through the through hole and is fixedly connected with the fastener; the fastening piece comprises an upper washer, a lower washer and a main nut, the main nut is in threaded connection with the second end of the main bolt, the upper washer and the lower washer are sleeved on the main bolt, and the upper washer and the lower washer are located between the main nut and the upper flange; according to the invention, the fastener is set to be a combined structure of the upper washer and the lower washer, and the pretightening force is applied through the main nut, so that the bending deformation and the bending stress of the main bolt and the top cover under the action of internal pressure are effectively inhibited, and further, the axial separation amount of the top cover and the cylinder flange under the action of internal pressure is effectively controlled.

Description

Bolt sealing structure and pressure container of high-flux engineering test reactor
Technical Field
The invention relates to the technical field of reactor structure design, in particular to a bolt sealing structure and a pressure container of a high-flux engineering test reactor.
Background
The nuclear reactor pressure vessel is generally composed of a top cover and a vessel, the top cover and the vessel are connected through bolt fasteners, and meanwhile, a bolt sealing structure is used for achieving a sealing function. Under the normal operation condition of the reactor, the reactor pressure vessel generates certain internal pressure. In order to ensure that the reactor pressure vessel does not generate axial separation of the top cover and the vessel and leakage of water in the reactor under the action of internal pressure, a bolt sealing structure is arranged between the top cover and the vessel so as to ensure the sealing performance during operation.
The existing bolt sealing structure adopts a connecting structure of a single spherical washer and a main nut, so that the bending deformation of the sealing structure under the internal pressure and the axial separation of a top cover and a cylinder flange under the internal pressure cannot be better inhibited; the high-reliability requirement that the sealing structure between the flange and the top cover of the cylinder body of the high-flux test reactor pressure vessel cannot be leaked and maintained in the whole reactor life can not be met.
Disclosure of Invention
The invention aims to solve the technical problem that the existing bolt sealing performance is poor, and aims to provide a bolt sealing structure and a pressure container of a high-flux engineering test pile, so that the problem that the high-flux engineering test pile cannot be adapted is solved.
The invention is realized by the following technical scheme:
a bolt sealing structure comprising:
a main bolt;
a fastener adapted to the main bolt;
the first end of the main bolt is fixedly connected with the lower flange;
the upper flange is arranged corresponding to the lower flange, a through hole corresponding to the main bolt is formed in the upper flange, and the second end of the main bolt penetrates through the through hole to be fixedly connected with the fastening piece;
the fastening piece comprises an upper washer, a lower washer and a main nut, the main nut is in threaded connection with the second end of the main bolt, the upper washer and the lower washer are sleeved on the main bolt, and the upper washer and the lower washer are located between the main nut and the upper flange;
the main nut provides pre-tightening force towards the lower flange to the upper gasket, the lower gasket and the upper flange.
Preferably, the side of the upper flange opposite to the lower flange is set to be above the bolt sealing structure;
the lower flange and the upper flange are coaxially arranged, and the upper side surface of the lower flange is in sealing fit with the lower side surface of the upper flange;
the lower end of the main bolt is provided with an external thread, the upper side surface of the lower flange is provided with a threaded hole matched with the main bolt, and the main bolt and the lower flange are fixedly connected through the external thread and the threaded hole;
the upper end of the main bolt penetrates through the through hole and is fixedly connected with the fastener arranged above the upper flange;
wherein the lower washer is disposed below the upper washer, and the main nut is disposed above the upper washer.
Specifically, the lower side surface of the lower gasket is in sealing fit with the upper side surface of the upper flange, and the upper side surface of the lower gasket is provided with an inclined surface;
the last side of going up the packing ring with the lower extreme laminating of main nut, the downside of going up the packing ring be provided with the inclined plane of the side adaptation of going up of packing ring down.
As an embodiment, the lower washer has an outer ring thickness greater than an inner ring thickness of the lower washer, and the upper washer has an outer ring thickness less than an inner ring thickness of the lower washer.
Furthermore, the bolt sealing structure also comprises an extension measuring rod, a long through hole penetrating through the upper end surface and the lower end surface is arranged in the main bolt, the long through hole and the main bolt are coaxially arranged, the extension measuring rod is arranged in the long through hole, and the lower end of the extension measuring rod is fixedly connected with the lower end of the long through hole;
the diameter of the extension measuring rod is not larger than the inner diameter of the long through hole, and the length of the extension measuring rod is not smaller than the original length of the extension measuring rod.
Furthermore, the bolt sealing structure also comprises a small nut, the small nut is in threaded connection with the upper end of the main bolt, and a gap is formed between the top end of the small nut and the upper end face of the main bolt;
and when the nut is in a sealing state, the distance between the upper end surface of the main nut and the upper end surface of the main bolt is smaller than the length of the small nut.
Preferably, a sealing ring assembly is disposed between the upper flange and the lower flange, and the sealing ring assembly includes:
a metal seal ring;
the lower side surface of the upper flange is provided with an annular groove coaxial with the upper flange, and the metal sealing ring is clamped in the annular groove through the elastic fixing component;
the depth of the annular groove is smaller than the outer diameter of the metal sealing ring, and the width of the annular groove is larger than the outer diameter of the metal sealing ring.
Specifically, the quantity of the elastic fixing component is a plurality of, and follows the axis of going up the flange is the annular and distributes, the elastic fixing component includes:
the sealing fixing clamp comprises a fixing ring and a fixing sheet, and the first end of the fixing sheet is fixedly connected with the outer edge of the fixing sheet;
the inner side/outer side of the annular groove is provided with a screw hole, and the fixing ring is fixedly connected with the lower side surface of the upper flange through the fixing screw and the screw hole;
and when the metal sealing ring is in a sealing state, the fixing piece is circumscribed with the outer ring surface of the cross section of the metal sealing ring.
Preferably, the number of the annular grooves is at least two, and the number of the metal sealing rings is at least two.
A pressure vessel of a high-flux engineering test pile comprises the bolt sealing structure.
Compared with the prior art, the invention has the following advantages and beneficial effects:
according to the invention, the fastener is set to be a combined structure of the upper washer and the lower washer, and the pretightening force is applied through the main nut, so that the bending deformation and the bending stress of the main bolt and the top cover under the action of internal pressure are effectively inhibited, and further, the axial separation amount of the top cover and the cylinder flange under the action of internal pressure is effectively controlled.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the principles of the invention.
Fig. 1 is a schematic structural view of a bolt sealing structure according to the present invention.
Figure 2 is a schematic structural view of a seal ring assembly according to the present invention.
Reference numerals:
1-small screw cap, 2-elongation measuring rod, 3-main bolt, 4-main nut, 5-upper gasket, 6-lower gasket, 7-upper flange, 8-lower flange, 9-fixing screw, 10-sealing fixing clamp and 11-metal sealing ring.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not to be construed as limitations of the invention.
It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
In the present invention, the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
The bolt sealing structure mentioned in the embodiment can be applied to various environments where two objects need to be connected and sealed, and for the sake of clarity, the embodiment provides a specific application example, namely the bolt sealing structure is applied to a pressure vessel of a high-throughput engineering test stack, and the bolt sealing structure in the embodiment is used for connecting the vessel and a top cover of the pressure vessel and ensuring the sealing.
The bolt sealing structure between the top cover and the container of the reactor pressure vessel commonly used at present corresponds the top cover flange and the bolt hole of the container flange by the guide rod of the bolt sealing structure, and then the corresponding main bolt 3, the main nut 4, the gasket and the like are assembled by using tools such as a bolt stretcher and the like, so that the effective sealing between the container flange and the top cover is realized.
Due to the particularity of the high-throughput test stack, the general bolt seal structure has several problems when used in the high-throughput test stack.
1) The bending deformation of the sealing structure under the internal pressure and the axial separation of the top cover and the cylinder flange under the internal pressure cannot be better inhibited;
2) the sealing structure can only realize short-term sealing of the cylinder flange and the top cover of the reactor pressure vessel and has higher technical risks of leakage, maintenance and the like, and cannot meet the high-reliability requirement that the sealing structure between the cylinder flange and the top cover of the high-flux test reactor pressure vessel cannot be leaked and does not need maintenance in the whole reactor life;
3) the main bolt 3 and the main nut are made of stainless steel materials, so that the functional requirement of long-term safe operation in a humid environment cannot be met;
therefore, the problems are solved, the reactor is suitable for a high-flux test reactor, and technical risks such as corrosion, leakage, maintenance and the like of a sealing structure between a cylinder flange and a top cover in the whole reactor life are avoided. The invention provides a novel bolt sealing structure of an austenitic stainless steel flange for a high-flux test reactor, which comprises a lower flange 8, an upper flange 7, a main bolt 3 and a fastener matched with the main bolt 3.
Example one
The upper flange 7 is arranged corresponding to the lower flange 8, the lower flange 8 and the upper flange 7 are generally arranged separately, the lower flange 8 is fixedly connected with one device to be connected, and the upper flange 7 is connected with the other device to be connected.
In this embodiment, the lower flange 8 is fixedly connected to the vessel and the upper flange 7 is fixedly connected to the top cover.
The first end of the main bolt 3 is fixedly connected with the lower flange 8; fixed connection mode can have multiple connection, if for the convenience of dismantling, can set up a screw hole on lower flange 8 to set up the external screw thread at the first end of kingbolt 3, connect through the external screw thread.
If disassembly is not required, the first ends of the kingbolts 3 may be welded directly to the lower flange 8 by welding.
The upper flange 7 is provided with a through hole corresponding to the main bolt 3, and the second end of the main bolt 3 penetrates through the through hole to be fixedly connected with the fastener;
after the main bolt 3 is fixed with the lower flange 8, the purpose of positioning the upper flange 7 and the lower flange 8 can be achieved by arranging the through hole, and the deviation is avoided.
The fastener comprises an upper washer 5, a lower washer 6 and a main nut 4, the main nut 4 is in threaded connection with the second end of the main bolt 3, the upper washer 5 and the lower washer 6 are sleeved on the main bolt 3, and the upper washer 5 and the lower washer 6 are located between the main nut 4 and the upper flange 7;
through setting up packing ring 5 and lower packing ring 6 to provide the pretightning force towards lower flange 8 through main nut 4 to upper packing ring 5, lower packing ring 6 and upper flange 7, the setting of two packing rings can effectively restrain kingbolt 3, upper flange 7 bending deformation and bending stress under the internal pressure effect, and then has effectively controlled upper flange 7 and the axial separation volume of lower flange 8 under the internal pressure effect.
For convenience of description, the orientation of the bolt sealing structure is defined, and the side of the upper flange 7 relative to the lower flange 8 is set to be above the bolt sealing structure, and the orientation is only for convenience of description of the whole structure, and the specific use orientation of the bolt sealing structure is not limited.
The lower flange 8 and the upper flange 7 are coaxially arranged, and the upper side surface of the lower flange 8 is in sealing fit with the lower side surface of the upper flange 7;
the lower end (i.e. the first end) of the main bolt 3 is provided with an external thread, the upper side surface of the lower flange 8 is provided with a threaded hole matched with the main bolt 3, and the main bolt 3 and the lower flange 8 are fixedly connected through the external thread and the threaded hole;
the upper end (i.e. the second end) of the main bolt 3 passes through the through hole and is fixedly connected with a fastener arranged above the upper flange 7;
wherein the lower washer 6 is disposed below the upper washer 5, and the main nut 4 is disposed above the upper washer 5.
The above-described structure is for determining the relationship between the respective elements after the orientation is set, and the following description is made for convenience.
The lower side surface of the lower gasket 6 is in sealing fit with the upper side surface of the upper flange 7, and the upper side surface of the lower gasket 6 is provided with an inclined surface;
the upper side surface of the upper washer 5 is attached to the lower end of the main nut 4, and the lower side surface of the upper washer 5 is provided with an inclined surface matched with the upper side surface of the lower washer 6.
By providing both the lower side surface of the upper gasket 5 and the upper side surface of the lower gasket 6 with the inclined structure, the bending deformation of the seal structure under the internal pressure and the axial separation of the upper flange 7 and the lower flange 8 under the internal pressure are further effectively suppressed.
And provides a preferred embodiment in which the outer ring thickness of the lower gasket 6 is greater than the inner ring thickness of the lower gasket 6, and the outer ring thickness of the upper gasket 5 is less than the inner ring thickness of the lower gasket 6.
Through setting up the structure into the conical surface, can increase stability, avoid appearing the condition of skew.
And this embodiment can be optimized more preferably, that is, the inclined surface between the outer ring of the lower washer 6 and the inner ring of the lower washer 6 is set to be an arc-shaped structure, so that the upper side surface of the lower washer 6 becomes a spherical concave surface, and the lower side surface of the upper washer 5 becomes a spherical convex surface corresponding thereto.
Example two
The bolt sealing structure further comprises an extension measuring rod 2, a long through hole penetrating through the upper end face and the lower end face is formed in the main bolt 3, the long through hole and the main bolt 3 are coaxially arranged, the extension measuring rod 2 is arranged in the long through hole, and the lower end of the extension measuring rod 2 is fixedly connected with the lower end of the long through hole;
thereby the circumference homogeneity of bolt elongation and pretightning force has been controlled effectively through setting up extension measuring stick 2.
When the measuring device is mounted, the extension measuring rod 2 is inserted into the long through hole, and the lower end of the long through hole is fixedly connected (generally, screwed) to the lower end of the extension measuring rod 2.
Simultaneously will set up the diameter that extension measuring stick 2 is not more than the internal diameter of trompil hole, extension measuring stick 2 length is not less than the original length of extension measuring stick 2, then can realize that kingbolt 3 is when being stretched, extension measuring stick 2 can not stretch thereupon to can realize the survey to kingbolt 3 elongation through the observation to extension measuring stick 2.
The bolt sealing structure also comprises a small nut 1, the small nut 1 is in threaded connection with the upper end of the main bolt 3, and a gap is formed between the top end of the small nut 1 and the upper end face of the main bolt 3;
in the sealed state, the distance between the upper end surface of the main nut 4 and the upper end surface of the main bolt 3 is smaller than the length of the small nut 1.
Through set up a little nut 1 in the upper end of kingbolt 3, can avoid debris to fall into in the long through-hole everywhere, cause the influence to the functional performance of extension measuring stick 2.
Meanwhile, the extension measuring rod 2 needs to be prevented from abutting against the small nut 1, and interference on the extension measuring rod 2 is avoided.
EXAMPLE III
In this embodiment, a seal ring assembly is additionally arranged between the upper flange 7 and the lower flange 8, and the seal ring assembly includes:
the metal seal ring 11, and the downside of going up flange 7 sets up the annular groove coaxial with last flange 7, and the degree of depth of annular groove is less than the external diameter of metal seal ring 11, and the annular groove width is greater than the external diameter of metal seal ring.
The reasonable proportion of the height of the metal sealing ring and the depth of the sealing groove is set to effectively control the compression amount of the metal sealing ring, effectively prevent the metal sealing ring from being compressed excessively, rebound failure and damage, and reserve enough space for reasonably adjusting the internal pressure resisting component (namely the pre-tightening force component on the contact surface of the lower flange 8 and the upper flange 7) of the pre-tightening force and the internal pressure.
The metal sealing ring has excellent resilience (realized by reasonable arrangement of metal sealing ring structures, materials and processes), so that the bolt sealing structure has good sealing performance and internal pressure adaptability, and effective sealing between the lower flange 8 and the upper flange 7 is realized.
The metal sealing ring 11 is clamped in the annular groove through the elastic fixing component; the elastic fixing component can be of various structures, and the main function of the elastic fixing component is fixing. An example is provided below.
The elastic fixing assembly comprises a sealing fixing clip 10 and a fixing screw 9.
The sealing fixing clamp 10 comprises a fixing ring and a fixing sheet, the first end of the fixing sheet is fixedly connected with the outer edge of the fixing sheet, and the plane where the fixing sheet is located and the plane where the fixing ring is located form an obtuse included angle.
The inner side/outer side of the annular groove is provided with a screw hole, and the fixing ring is fixedly connected with the lower side surface of the upper flange 7 through a fixing screw 9 and the screw hole;
and in order to avoid that the fixing screws 9 can protrude out of the lower side surface of the upper flange 7 when the fixing ring is fixed, the screw holes are set to be trapezoidal screw holes, so that the protruding of the fixing screws 9 is avoided.
The number of the elastic fixing components is a plurality (at least 3, the better fixing can be realized), and the elastic fixing components are distributed along the central axis of the upper flange 7 in an annular shape,
as shown in fig. 2, in the sealed state, the fixing pieces are circumscribed with the outer annular surface of the cross section of the metal seal ring 11, and the fixing pieces provide the metal seal ring 11 with a force toward the bottom (upper side in the drawing) of the annular groove so that the metal seal ring 11 does not fall out of the annular groove.
As shown in fig. 2, the number of the annular grooves is at least two, the number of the metal sealing rings 11 is at least two, and the bolt sealing structure is further enabled to have good sealing performance and internal pressure adaptability through the redundant design of multiple metal sealing rings, so that effective sealing between the cylinder body flange and the top cover is further realized.
In addition, because the high-flux engineering test reactor operates for a long time in a humid environment with water inside and outside, the fastener of the bolt sealing structure should have good corrosion resistance.
The fastening piece has good comprehensive mechanical property, and the main bolt 3 and the main nut 4 have certain hardness difference to prevent the main bolt 3 and the main bolt from being seized, so the main bolt 3 adopts a mature 05Cr17Ni4Cu4Nb stainless steel material, and the main nut, the upper washer 5, the lower washer 6, the small nut 1 and the like adopt a mature 12Cr13 stainless steel material.
When the sealing ring is assembled, firstly, two metal sealing rings are arranged in the sealing groove and installed, and then the screw holes of the lower flange 8 correspond to the through holes of the upper flange 7 in one-to-one mode. And sequentially installing the corresponding main bolt 3, the upper washer 5, the lower washer 6, the main nut 4 and the extension measuring rod 2 into the corresponding lower flange 8 and the upper flange 7.
And (3) stretching the main bolt 3 by using a bolt stretcher according to the length of the extension measuring rod 2, controlling the elongation of the bolt and the axial distribution of the pretightening force, and finally screwing the small nut 1.
In the description herein, reference to the description of the terms "one embodiment/mode," "some embodiments/modes," "example," "specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/mode or example is included in at least one embodiment/mode or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to be the same embodiment/mode or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/aspects or examples and features of the various embodiments/aspects or examples described in this specification can be combined and combined by one skilled in the art without conflicting therewith.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
It will be understood by those skilled in the art that the foregoing embodiments are merely for clarity of description and are not intended to limit the scope of the invention. It will be apparent to those skilled in the art that other variations or modifications may be made on the above invention and still be within the scope of the invention.

Claims (10)

1. A bolt sealing structure, comprising:
a main bolt;
a fastener adapted to the main bolt;
the first end of the main bolt is fixedly connected with the lower flange;
the upper flange is arranged corresponding to the lower flange, a through hole corresponding to the main bolt is formed in the upper flange, and the second end of the main bolt penetrates through the through hole to be fixedly connected with the fastening piece;
the fastening piece comprises an upper washer, a lower washer and a main nut, the main nut is in threaded connection with the second end of the main bolt, the upper washer and the lower washer are sleeved on the main bolt, and the upper washer and the lower washer are located between the main nut and the upper flange;
the main nut provides pre-tightening force towards the lower flange to the upper gasket, the lower gasket and the upper flange.
2. A bolt sealing structure according to claim 1, wherein a side of said upper flange with respect to said lower flange is set above said bolt sealing structure;
the lower flange and the upper flange are coaxially arranged, and the upper side surface of the lower flange is in sealing fit with the lower side surface of the upper flange;
the lower end of the main bolt is provided with an external thread, the upper side surface of the lower flange is provided with a threaded hole matched with the main bolt, and the main bolt and the lower flange are fixedly connected through the external thread and the threaded hole;
the upper end of the main bolt penetrates through the through hole and is fixedly connected with the fastener arranged above the upper flange;
wherein the lower washer is disposed below the upper washer, and the main nut is disposed above the upper washer.
3. A bolt sealing structure according to claim 2, wherein the lower side of the lower washer is in sealing engagement with the upper side of the upper flange, and the upper side of the lower washer is provided with an inclined surface;
the last side of going up the packing ring with the lower extreme laminating of main nut, the downside of going up the packing ring be provided with the inclined plane of the side adaptation of going up of packing ring down.
4. A bolt sealing structure according to claim 3, wherein the outer ring thickness of said lower washer is greater than the inner ring thickness of said lower washer, and the outer ring thickness of said upper washer is less than the inner ring thickness of said lower washer.
5. The bolt sealing structure according to claim 2, further comprising an extension measuring rod, wherein a long through hole penetrating through the upper and lower end surfaces is formed in the main bolt, the long through hole is coaxially arranged with the main bolt, the extension measuring rod is arranged in the long through hole, and the lower end of the extension measuring rod is fixedly connected with the lower end of the long through hole;
the diameter of the extension measuring rod is not larger than the inner diameter of the long through hole, and the length of the extension measuring rod is not smaller than the original length of the extension measuring rod.
6. The bolt sealing structure according to claim 2, further comprising a small nut threadedly coupled to the upper end of the main bolt, wherein a gap is provided between a tip end of the small nut and the upper end surface of the main bolt;
and when the nut is in a sealing state, the distance between the upper end surface of the main nut and the upper end surface of the main bolt is smaller than the length of the small nut.
7. A bolt sealing structure according to claim 1, wherein a seal ring assembly is provided between the upper flange and the lower flange, the seal ring assembly comprising:
a metal seal ring;
the lower side surface of the upper flange is provided with an annular groove coaxial with the upper flange, and the metal sealing ring is clamped in the annular groove through the elastic fixing component;
the depth of the annular groove is smaller than the outer diameter of the metal sealing ring, and the width of the annular groove is larger than the outer diameter of the metal sealing ring.
8. The bolt sealing structure of claim 7, wherein the number of the elastic fixing components is plural and is distributed annularly along the central axis of the upper flange, and the elastic fixing components comprise:
the sealing fixing clamp comprises a fixing ring and a fixing sheet, and the first end of the fixing sheet is fixedly connected with the outer edge of the fixing sheet;
the inner side/outer side of the annular groove is provided with a screw hole, and the fixing ring is fixedly connected with the lower side surface of the upper flange through the fixing screw and the screw hole;
and when the metal sealing ring is in a sealing state, the fixing piece is circumscribed with the outer ring surface of the cross section of the metal sealing ring.
9. A bolt sealing structure according to claim 7 or 8, wherein the number of the annular grooves is at least two, and the number of the metal seal rings is at least two.
10. A pressure vessel for a high throughput engineering pilot stack, comprising a bolt seal arrangement according to any one of claims 1 to 9.
CN202110993572.4A 2021-08-27 2021-08-27 Bolt sealing structure and pressure container of high-flux engineering test reactor Pending CN113685425A (en)

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CN202110993572.4A CN113685425A (en) 2021-08-27 2021-08-27 Bolt sealing structure and pressure container of high-flux engineering test reactor

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Application Number Priority Date Filing Date Title
CN202110993572.4A CN113685425A (en) 2021-08-27 2021-08-27 Bolt sealing structure and pressure container of high-flux engineering test reactor

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CN213748180U (en) * 2020-12-15 2021-07-20 山东核电有限公司 Bolt elongation measuring tool for process monitoring
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