CN219914140U - Manhole self-sealing top cover structure of high-pressure heat exchanger - Google Patents
Manhole self-sealing top cover structure of high-pressure heat exchanger Download PDFInfo
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- CN219914140U CN219914140U CN202321182912.6U CN202321182912U CN219914140U CN 219914140 U CN219914140 U CN 219914140U CN 202321182912 U CN202321182912 U CN 202321182912U CN 219914140 U CN219914140 U CN 219914140U
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- sealing
- manhole
- top cover
- gasket
- heat exchanger
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- 238000007789 sealing Methods 0.000 title claims abstract description 88
- 241000283216 Phocidae Species 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 8
- 239000002023 wood Substances 0.000 abstract description 2
- 230000006835 compression Effects 0.000 abstract 2
- 238000007906 compression Methods 0.000 abstract 2
- 238000003825 pressing Methods 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000003245 coal Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
Abstract
The utility model discloses a manhole self-sealing top cover structure of a high-pressure heat exchanger, which is used for a manhole of the high-pressure heat exchanger, wherein a top cover is arranged in the manhole, the upper part of the side of the top cover is provided with an annular sealing part, and the sealing part is of an inclined plane structure; an annular clamping groove is formed in the radial recess of the side wall of the manhole above the sealing part, a clamping ring is embedded in the annular clamping groove, the clamping ring protrudes inwards in the radial direction of the annular clamping groove, and an annular stress part is formed on the lower surface of the protruding annular clamping groove part; a rubber sealing gasket and a gasket are pressed between the stress part and the sealing part; a tensioning structure is arranged between the top end of the side wall of the manhole and the top cover. The utility model improves the wood sealing structure in the prior art into a plane sealing surface, reduces the processing difficulty and the cost, and enhances the integral sealing effect through a specific sealing structure. The sealing part and the rubber sealing gasket are inclined planes on the matching surface, so that the rubber sealing gasket simultaneously compresses the gasket and the inner wall of the manhole, the compression area is enlarged, and the compression sealing effect is improved.
Description
Technical Field
The utility model relates to the technical field of mechanical manufacturing, in particular to a sealing top cover structure at a manhole of a high-pressure heat exchanger.
Background
The high-pressure heat exchanger (namely a high-pressure heater) is a common pressure vessel, is a main device of a regenerative system in a thermal power generation unit, and has important significance for reducing the coal consumption of a power plant, increasing the output of the unit, improving the efficiency of the unit, improving the economic operation of the power plant and the like by utilizing the superheat degree of steam extraction and condensation heat release of a steam turbine.
In order to facilitate maintenance, a manhole is arranged on a shell of the high-pressure heat exchanger (namely, the high-pressure heater), and the manhole needs to be airtight during normal operation, so that a top cover and a top cover sealing structure are arranged at the manhole.
National standard of the people's republic of China GB150.1-150.4-2011, pressure vessel, page 255, specifies: in the wood sealing structure, the top cover and the pressing pad are designed according to the line sealing, so that the sealing surface of the top cover is determined to be an arc surface (the plane is changed into a plane sealing instead of the line sealing), and the arc surface is consistent with the drawing on page 256 of the pressure container.
Therefore, in the existing product of the high-pressure heat exchanger of the company, the annular sealing surface at the upper part of the top cover side at the manhole is an arc surface, and the matched sealing structure is an annular metal gasket. The sealing surface of the arc surface has high requirements on the finish degree, is difficult to process and improves the manufacturing cost. The integral sealing structure formed with the metal gasket is susceptible to leakage.
Therefore, the top cover sealing structure at the manhole of the high-pressure heat exchanger is required to be redesigned, the processing difficulty and the cost are reduced, and the sealing effect is enhanced.
Disclosure of Invention
The utility model aims to provide a manhole self-sealing top cover structure of a high-pressure heat exchanger, which replaces cambered surface sealing with plane sealing, reduces processing difficulty and cost and enhances sealing effect.
In order to achieve the above purpose, the manhole self-sealing top cover structure of the high-pressure heat exchanger is used for a manhole of the high-pressure heat exchanger, a top cover is arranged in the manhole, an annular sealing part is arranged at the upper part of the side of the top cover, and the sealing part is of an inclined plane structure;
an annular clamping groove is formed in the radial recess of the side wall of the manhole above the sealing part, a clamping ring is embedded in the annular clamping groove, the clamping ring protrudes inwards in the radial direction of the annular clamping groove, and an annular stress part is formed on the lower surface of the protruding annular clamping groove part;
a rubber sealing gasket and a gasket are pressed between the stress part and the sealing part;
a tensioning structure is arranged between the top end of the side wall of the manhole and the top cover and is used for enabling the stress part and the sealing part to be in mutually compressed fit through a gasket and a rubber sealing gasket.
The clamping rings are uniformly divided into 4 sections at intervals along the circumferential direction, and the clamping rings of the sections are respectively embedded in the annular clamping grooves and are spliced into a complete clamping ring.
The tensioning structure comprises a cover plate which is covered at the top end of the manhole, an upper screw hole is formed in the middle of the cover plate, a lower screw hole is formed in the upper surface of the top cover below the upper screw hole downwards, and the rotation directions of internal threads of the upper screw hole and the lower screw hole are opposite;
a double-screw is connected between the cover plate and the top cover, an upper thread part matched with the upper screw hole is arranged at the upper part of the double-screw, and a lower thread part matched with the lower screw hole is arranged at the lower part of the double-screw;
the upper end of the double-screw rod extends upwards out of the cover plate and is connected with a tightening ring.
The utility model has the following advantages:
the utility model belongs to the field of pressure vessels in a broad sense, improves an arc sealing surface in the prior art into a plane sealing surface, reduces processing difficulty and cost, and enhances the integral sealing effect through a specific sealing structure.
The sealing part is of an inclined plane structure, and the matching surface of the sealing part and the rubber sealing gasket is an inclined plane, so that the rubber sealing gasket simultaneously presses the gasket and the inner wall of the manhole, the pressing area is enlarged, and the pressing sealing effect is improved.
The snap ring is embedded in the annular clamping groove and protrudes inwards, so that the outer diameter of the snap ring is required to be larger than the inner diameter of the manhole, and the snap ring is difficult to be embedded in the annular clamping groove during assembly. The clamping ring is divided into 4 sections, and each section of clamping ring is smaller than the manhole, so that the clamping ring can be conveniently put into the manhole and then pushed into the annular clamping groove, and the assembly is very convenient.
After the tightening ring is conveniently inserted into the rod, the rod is rotated so as to drive the double-helical screw to rotate. When the double-screw rotates forwards or reversely, the top cover and the cover plate are subjected to relatively close force, so that the clamping ring and the cover plate generate pretightening force on the rubber sealing gasket and the gasket between the two, and primary sealing is formed. After the high-pressure heat exchanger is put into operation, the internal pressure of the high-pressure heat exchanger is gradually increased, and then upward pressure is applied to the top cover, so that the pressure generated by the clamping ring and the cover plate on the rubber sealing gasket and the gasket between the clamping ring and the cover plate is increased, the tightness of the high-pressure heat exchanger is improved, and good sealing is formed at the manhole.
Drawings
Fig. 1 is a schematic structural view of the present utility model.
Detailed Description
As shown in fig. 1, the manhole self-sealing top cover structure of the high-pressure heat exchanger is used for a manhole of the high-pressure heat exchanger, a top cover 1 is arranged in the manhole, an annular sealing part 2 is arranged at the upper part of the side of the top cover 1, and the sealing part 2 is of an inclined plane structure;
an annular clamping groove 3 is formed in a radial concave manner in the side wall 7 of the manhole above the sealing part 2, a clamping ring 4 is embedded in the annular clamping groove 3, the clamping ring 4 protrudes inwards in the radial direction into the annular clamping groove 3, and an annular stress part is formed on the lower surface of the part protruding out of the annular clamping groove 3; a rubber sealing gasket 5 and a gasket 6 are pressed between the stress part and the sealing part 2;
a tensioning structure is arranged between the top end of the manhole side wall 7 and the top cover 1 and is used for enabling the stress part and the sealing part 2 to be in mutually compressed fit through the gasket 6 and the rubber sealing gasket 5 so as to form primary sealing.
The utility model belongs to the field of pressure vessels in a broad sense, improves an arc sealing surface in the prior art into a plane sealing surface, reduces processing difficulty and cost, and enhances the integral sealing effect through a specific sealing structure.
The sealing part 2 is of an inclined plane structure, and the matching surface of the sealing part and the rubber sealing gasket 5 is an inclined plane, so that the rubber sealing gasket 5 simultaneously presses the gasket 6 and the inner wall of the manhole, the pressing area is enlarged, and the pressing sealing effect is improved.
The clamping rings 4 are uniformly divided into 4 sections at intervals along the circumferential direction, and each section of clamping ring 4 is respectively embedded in the annular clamping groove 3 and is spliced into a complete clamping ring 4.
The snap ring 4 is embedded in the annular clamping groove 3 and protrudes inwards into the annular clamping groove 3, so that the outer diameter of the snap ring 4 is required to be larger than the inner diameter of the manhole, and the snap ring 4 is difficult to be embedded into the annular clamping groove 3 during assembly. According to the utility model, the clamping ring 4 is divided into 4 sections, and each section of clamping ring 4 is smaller than the manhole, so that the clamping ring can be conveniently put into the manhole and then pushed into the annular clamping groove 3, and the assembly is very convenient.
The tensioning structure comprises a cover plate 8 which is covered at the top end of the manhole, an upper screw hole 9 is formed in the middle of the cover plate 8, a lower screw hole 10 is formed in the upper surface of the top cover 1 below the upper screw hole 9 downwards, and the screwing directions of internal threads of the upper screw hole 9 and the lower screw hole 10 are opposite;
a double-screw 11 is connected between the cover plate 8 and the top cover 1, an upper thread part matched with the upper screw hole 9 is arranged at the upper part of the double-screw 11, a lower thread part matched with the lower screw hole 10 is arranged at the lower part of the double-screw 11, and the external threads of the upper thread part and the lower thread part are opposite in rotation direction;
the upper end of the double helical screw 11 protrudes upwards beyond the cover plate 8 and is connected with a tightening ring 12. After the tightening ring 12 is inserted into the shaft, the shaft is rotated to rotate the double helical screw 11. When the double-screw 11 rotates forward or reversely, the top cover 1 and the cover plate 8 are subjected to relatively close force, so that the clamp ring 4 and the cover plate 8 generate pretightening force on the rubber sealing gasket 5 and the gasket 6 between the two, and primary sealing is formed. After the high-pressure heat exchanger is put into operation, the internal pressure of the high-pressure heat exchanger is gradually increased, and then upward pressure is applied to the top cover 1, so that the pressure generated by the clamping ring 4 and the cover plate 8 on the rubber sealing gasket 5 and the gasket 6 between the clamping ring 4 and the cover plate is increased, the tightness of the high-pressure heat exchanger is improved, and good sealing is formed at a manhole.
Of course, when the double-screw 11 rotates reversely or positively, the top cover 1 and the cover plate 8 tend to be relatively far away, and at this time, the double-screw 11 can be separated from the lower screw hole 10 upwards, so that the utility model is convenient to detach. After the manhole is detached, the manhole can be manually drilled into the high-pressure heat exchanger for maintenance, so that the maintenance is not affected, and the manhole is kept in a sealed state in long-term work. The term self-sealing in the name of the utility model means that under the action of high pressure in the heat exchanger, the top cover 1 automatically pushes up the rubber sealing gasket 5 and the gasket 6 so as to automatically form good sealing.
The above embodiments are only for illustrating the technical solution of the present utility model, and it should be understood by those skilled in the art that although the present utility model has been described in detail with reference to the above embodiments: modifications and equivalents may be made thereto without departing from the spirit and scope of the utility model, which is intended to be encompassed by the claims.
Claims (3)
1. The utility model provides a high pressure heat exchanger manhole self sealss top cap structure for the manhole of high pressure heat exchanger is equipped with the top cap in the manhole, and top cap side upper portion has annular sealing part, its characterized in that: the sealing part is of an inclined plane structure;
an annular clamping groove is formed in the radial recess of the side wall of the manhole above the sealing part, a clamping ring is embedded in the annular clamping groove, the clamping ring protrudes inwards in the radial direction of the annular clamping groove, and an annular stress part is formed on the lower surface of the protruding annular clamping groove part;
a rubber sealing gasket and a gasket are pressed between the stress part and the sealing part;
a tensioning structure is arranged between the top end of the side wall of the manhole and the top cover and is used for enabling the stress part and the sealing part to be in mutually compressed fit through a gasket and a rubber sealing gasket.
2. The high pressure heat exchanger manhole self-sealing top cover structure of claim 1, wherein: the clamping rings are uniformly divided into 4 sections at intervals along the circumferential direction, and the clamping rings of the sections are respectively embedded in the annular clamping grooves and are spliced into a complete clamping ring.
3. The manhole self-sealing top cover structure of a high pressure heat exchanger according to claim 1 or 2, wherein: the tensioning structure comprises a cover plate which is covered at the top end of the manhole, an upper screw hole is formed in the middle of the cover plate, a lower screw hole is formed in the upper surface of the top cover below the upper screw hole downwards, and the rotation directions of internal threads of the upper screw hole and the lower screw hole are opposite;
a double-screw is connected between the cover plate and the top cover, an upper thread part matched with the upper screw hole is arranged at the upper part of the double-screw, and a lower thread part matched with the lower screw hole is arranged at the lower part of the double-screw;
the upper end of the double-screw rod extends upwards out of the cover plate and is connected with a tightening ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321182912.6U CN219914140U (en) | 2023-05-17 | 2023-05-17 | Manhole self-sealing top cover structure of high-pressure heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321182912.6U CN219914140U (en) | 2023-05-17 | 2023-05-17 | Manhole self-sealing top cover structure of high-pressure heat exchanger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219914140U true CN219914140U (en) | 2023-10-27 |
Family
ID=88434970
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321182912.6U Active CN219914140U (en) | 2023-05-17 | 2023-05-17 | Manhole self-sealing top cover structure of high-pressure heat exchanger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219914140U (en) |
-
2023
- 2023-05-17 CN CN202321182912.6U patent/CN219914140U/en active Active
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