CN212672406U - Novel stop valve for high-temperature high-pressure large-caliber power plant - Google Patents
Novel stop valve for high-temperature high-pressure large-caliber power plant Download PDFInfo
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- CN212672406U CN212672406U CN202020983582.0U CN202020983582U CN212672406U CN 212672406 U CN212672406 U CN 212672406U CN 202020983582 U CN202020983582 U CN 202020983582U CN 212672406 U CN212672406 U CN 212672406U
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Abstract
The utility model discloses a novel stop valve for high temperature, high pressure and large caliber of a power plant, wherein a pre-opening valve is added in a valve body of the stop valve, and the pre-opening valve comprises a pre-opening valve core and a pre-opening valve seat; the valve rod and the main valve core are movably connected in a split mode, and a spherical sealing structure is additionally arranged between the valve rod and the main valve core, so that the internal leakage of the valve caused by the deformation of the valve rod is avoided; the lower part of the main valve core is provided with a conical space, the pre-opening valve is arranged in the conical space at the lower part of the main valve core, and the valve rod penetrates through the main valve core and is movably connected with the valve core of the pre-opening valve in a split mode; the pre-opening valve seat is positioned in the middle of the conical space of the main valve core and fixed on the inner wall of the main valve core, the pre-opening valve core is movably connected with the pre-opening valve seat, and the valve rod is used for lifting the pre-opening valve core to realize sealing. The utility model discloses a redesign stop valve inner structure increases the valve of opening in advance, reduces the phenomenon of leaking in the high temperature high pressure heavy-calibre stop valve, has effectively reduced maintenance fortune dimension cost, has reduced the pollutant emission, guarantees the operation of unit safety and stability.
Description
Technical Field
The utility model relates to a thermal power equipment, specifically speaking relates to a heavy-calibre pipe valve equipment that uses under high temperature high pressure environment.
Background
At present, most of stop valves used in thermal power plants in the market and having high temperature, high pressure and large caliber can leak in the valves when in use. The internal leakage of a stop valve used for high-temperature, high-pressure and large-caliber in a thermal power plant can cause that part of high-quality high-temperature and high-pressure steam does not work, thereby influencing the economic operation of a unit and increasing the pollutant discharge amount; when the internal leakage of part of the high-temperature high-pressure large-caliber stop valves is serious, the abnormal operation parameters of a unit can be caused, the vacuum of the unit is influenced, the steam exhaust of a steam turbine is not smooth, the local deformation of the steam turbine is increased, the serious scouring damage is caused to pipelines and equipment connected to the outlets of the stop valves, and the overhauling, operation and maintenance cost is increased; if the internal leakage is serious, the unit can only be forced to stop running so as to overhaul the internal leakage valve, the overhaul period of the internal leakage stop valve with high temperature, high pressure and large caliber is long, the unit is caused to stop running for a long time, a large amount of manpower and material resources are consumed, and the safe and stable running of the unit is seriously influenced.
SUMMERY OF THE UTILITY MODEL
The utility model discloses just a novel stop valve that is used for power plant's high temperature high pressure heavy-calibre designed in order to solve above-mentioned technical problem.
The utility model provides a technical scheme that this technical problem adopted is:
a novel stop valve for a high-temperature high-pressure large-caliber power plant comprises a valve body, a main valve seat, a valve rod, a valve cover, a packing gland, packing, a valve cover bolt, an inlet pipeline and an outlet pipeline; a pre-starting valve is added in the valve body of the stop valve, and comprises a pre-starting valve core and a pre-starting valve seat; the valve rod and the main valve core are movably connected in a split mode, and a spherical sealing structure is additionally arranged between the valve rod and the main valve core, so that the internal leakage of the valve caused by the deformation of the valve rod is avoided; the lower part of the main valve core is provided with a conical space, the pre-opening valve is arranged in the conical space at the lower part of the main valve core, and the valve rod and the pre-opening valve core are of an integrated structure; the pre-opening valve seat is positioned in the middle of the conical space of the main valve core and fixed on the inner wall of the main valve core, the pre-opening valve core is movably connected with the pre-opening valve seat, the pre-opening valve core is lifted through the valve rod, and the sealing surface of the pre-opening valve core is tightly attached to the pre-opening valve seat, so that the sealing effect is achieved.
The utility model provides a novel stop valve for power plant's high temperature high pressure heavy-calibre, there is an elastomeric element between pre-opened valve case and the pre-opened valve disk seat, the elastomeric element lower extreme is hugged closely pre-opened valve case upper wall, and the elastomeric element upper end is hugged closely pre-opened valve disk seat inner wall, keeps the sealed face of pre-opened valve case and the pre-opened valve disk seat separately under no exogenic action under elastomeric element's elastic action.
A novel stop valve for power plant's high temperature high pressure heavy-calibre, elastomeric element is the dish spring.
A novel stop valve for power plant's high temperature high pressure heavy-calibre, the sealed face of pre-opened valve case is spherical sealed face.
According to the novel stop valve for the high-temperature high-pressure large-caliber power plant, the lower part of the valve core of the pre-starting valve is provided with the balance plate, the balance plate is a cylinder, the outer surface of the cylinder is provided with the threads, the balance plate is matched with the internal threads of the conical space at the lower part of the main valve core and is fixed in the main valve core, and the stop retaining ring is additionally arranged after the balance plate is arranged in the conical space at the lower part of the main valve; the balance plate is provided with a first balance hole which is communicated from bottom to top, the main valve core is provided with a second balance hole which is communicated from bottom to top, and a balance channel is formed by the first balance hole, a channel between a valve core sealing surface of the pre-opening valve and a valve seat of the pre-opening valve and the balance hole.
The utility model provides a novel stop valve for power plant's high temperature high pressure heavy-calibre, establish the guide cone before the main valve core, through the clearance fit of guide cone and main valve seat hole, guaranteed that the axiality between main valve core and main valve seat has still played the effect that the throttle steps down simultaneously to better protection sealed face not by the erosion, carry through the valve rod and draw the main valve core, make the sealed face of main valve core hug closely the sealed face of main valve disk seat, reach sealed effect.
The utility model provides a novel stop valve for power plant's high temperature high pressure heavy-calibre, the valve cage formula valve cage as an organic whole of stop valve, valve cage and main valve seat combination as an organic whole promptly, the sealed face of main valve disk seat is located the handing-over department of main valve seat lower extreme and valve body hole, has reduced the influence of decentraction to sealed effect between valve cage and the disk seat assembly part, makes the sealed face of main valve case and main valve disk seat can be better location and sealed.
A novel stop valve for power plant's high temperature high pressure heavy-calibre, the sealed face of main valve case is spherical sealed face.
The utility model has the advantages that: through redesign stop valve inner structure, increase the valve of opening in advance, reduce the phenomenon of leaking in the high temperature high pressure heavy-calibre stop valve, effectively reduced maintenance fortune dimension cost, reduced the pollutant emission, improve unit economic nature, guarantee unit safety and stability operation.
Drawings
FIG. 1 is a schematic view of a half-section structure of the present invention;
FIG. 2 is an enlarged schematic view of part I of FIG. 1;
FIG. 3 is an enlarged schematic view of the pre-open valve;
fig. 4 is a schematic structural diagram of the balance channel after the pre-starting valve is amplified.
The figures are numbered: 1-a valve body; 2-pre-opening the valve core; 3, movably connecting a valve rod with a valve core of the pre-opening valve; 4-main valve seat; 5-valve stem; 6-valve cover; 7-packing gland; 8-packing; 9-bonnet bolts; 10-metal wound mat seals; 11-balance hole one; 12-pre-opening the valve seat; 13-pre-opening the valve core; 14-a spool flow-through window; 15-main valve seat sealing surface; 16-main valve spool sealing face; 17-balance hole two; 18-an elastic member; 19-balance plate.
Detailed Description
The present invention will be further explained with reference to the drawings and examples.
As shown in fig. 1-3, the utility model relates to a novel stop valve for high temperature, high pressure and large caliber of power plant, which comprises a valve body 1, a main valve seat 4, a valve rod 5, a valve cover 6, a packing gland 7, packing 8, a valve cover bolt 9, an inlet pipeline and an outlet pipeline; a pre-starting valve is added in the valve body 1 of the stop valve, and comprises a pre-starting valve core 2 and a pre-starting valve seat 12; the valve rod 5 and the main valve core 3 are movably connected in a split mode, and a spherical sealing structure is additionally arranged between the valve rod 5 and the main valve core 3, so that the valve inner leakage caused by the deformation of the valve rod is avoided; the lower part of the main valve core 3 is provided with a conical space, the pre-opening valve is arranged in the conical space at the lower part of the main valve core 3, and the valve rod 5 and the pre-opening valve core 2 are of an integrated structure; the pre-opening valve seat 12 is positioned in the middle of the conical space of the main valve element 3 and fixed on the inner wall of the main valve element 3, the pre-opening valve element 2 is movably connected with the pre-opening valve seat 12, and the valve rod 5 is used for lifting the pre-opening valve element 2, so that the sealing surface 13 of the pre-opening valve element is tightly attached to the pre-opening valve seat 12, and the sealing effect is achieved.
The utility model provides a novel stop valve for power plant's high temperature high pressure heavy-calibre, there is an elastomeric element 18 between valve core 2 and the valve disk seat 12 of pre-opening, elastomeric element 18 lower extreme is hugged closely the 2 upper walls of valve core 2 of pre-opening, and the valve disk seat 12 inner wall of pre-opening is hugged closely to elastomeric element 18 upper end, keeps valve core sealed face 13 and valve disk seat 12 of pre-opening to part under no exogenic action under elastomeric element 18's the spring action.
The novel stop valve for the high-temperature high-pressure large-caliber power plant is characterized in that the elastic part 18 is a disc spring.
A novel stop valve for power plant's high temperature high pressure heavy-calibre, the sealed face 13 of valve core of pre-opened valve is spherical sealed face.
According to the novel stop valve for the high-temperature high-pressure large-caliber power plant, the lower part of the valve core 2 of the pre-opening valve is provided with the balance plate 19, the balance plate 19 is a cylinder, the outer surface of the cylinder is provided with threads, the balance plate is matched with the internal threads of the conical space at the lower part of the main valve core 3 and is fixed in the main valve core 3, and the balance plate 19 is arranged in the conical space at the lower part of the main valve core 3 and then is provided with the stopping check ring; the balance plate 19 is provided with a first balance hole 11 which penetrates from bottom to top, the main valve element 3 is provided with a second balance hole 17 which penetrates from bottom to top, and a balance channel is formed by the first balance hole 11, a channel between the valve element sealing surface 13 of the pre-opening valve and the valve seat 12 of the pre-opening valve and the second balance hole 17, as shown in fig. 4.
The utility model provides a novel stop valve for power plant's high temperature high pressure heavy-calibre, establish the guide cone before main valve core 3, through the clearance fit of guide cone and 4 holes of main valve seat, guaranteed that the axiality between main valve core 3 and main valve seat 4 has still played the effect that the throttle steps down simultaneously to sealed face has not been erodeed in better protection, carries through valve rod 5 and draws main valve core 3, makes the sealed face of main valve core 16 hug closely the sealed face 15 of main valve seat, reaches sealed effect.
The utility model provides a novel stop valve for power plant's high temperature high pressure heavy-calibre, the valve cage formula valve cage as an organic whole of valve cage and main valve seat 4 combination promptly, main valve disk seat sealing face 15 is located the handing-over department of 4 lower extremes of main valve seat and 1 hole of valve body, has reduced the influence of decentraction to sealed effect between valve cage and the valve seat assembly part, makes main valve case and the sealed face 15 of main valve disk seat can better location and seal.
A kind of new stop valve used for high temperature high pressure heavy-calibre of the power plant, the sealed surface 16 of valve core of the main valve is a spherical sealed surface.
Because under the environment of large-caliber high temperature and high pressure, in order to reduce the moment of the actuating mechanism, the valve can be opened and closed smoothly, and a new pre-opening valve is designed for realizing the purpose. The guide cone is additionally arranged in front of the main sealing surface of the main valve core 3, and through the clearance fit of the guide cone and the inner hole of the main valve seat 4, the coaxiality between the main valve core 3 and the main valve seat 4 is ensured, and meanwhile, the throttling and pressure reducing effects are also achieved, so that the sealing surface is better protected from erosion.
The valve rod 5 is movably connected with the pre-opening valve core 2, the main valve core is movably connected with the main valve seat, and the valve rod can be self-positioned when the valve rod is closed, so that the sealing effect of the pre-opening valve core 2 and the pre-opening valve seat 12 and the sealing effect of the main valve core and the main valve seat are not influenced by the deformation factor of the valve rod 5.
The newly designed integrated valve cage 4 combines the valve cage and the valve seat, and all functions required by the valve cage and the valve seat are realized by one part, so that the cost is saved. The newly designed main valve seat sealing surface 15 is positioned at the joint of the lower end surface of the part and the inner hole of the valve body, so that the influence of non-concentricity between the valve cage and the valve seat assembly part on the sealing effect is reduced, and the valve core and the main valve seat sealing surface of the main valve can be better positioned and sealed.
Because the valve core sealing structure is applied to a large-caliber high-temperature and high-pressure environment, in order to improve the sealing effect when the valve core sealing structure is closed, the main valve core sealing surface 16, the valve seat sealing surface 15 on the integrated valve cage, the pre-opening valve core 2 and the pre-opening valve seat 12 are designed into self-sealing structures. When the valve is closed, along with the increase of medium pressure, the valve rod is movably connected with the valve core of the pre-opening valve 3, the valve core of the pre-opening valve 2 is movably connected with the valve core of the main valve, the larger the pressure difference between the front and the back of the valve is, the larger the acting force applied to the wedge-shaped sealing surface in the structure is, the better the sealing effect is, the tightness of the valve can be greatly improved, and the internal leakage phenomenon of the valve is reduced. In order to be able to close the valve more tightly by means of the force of the medium inside the valve, the valve is operated in the manner of a lift-off closure.
The present invention is not limited to the above-mentioned best mode, and any other products similar or identical to the present invention, which can be obtained by anyone under the teaching of the present invention, all fall within the protection scope of the present invention.
Claims (8)
1. A novel stop valve for a high-temperature high-pressure large-caliber power plant comprises a valve body (1), a main valve seat (4), a valve rod (5), a valve cover (6), a packing gland (7), packing (8), a valve cover bolt (9), an inlet pipeline and an outlet pipeline; the method is characterized in that: a pre-starting valve is added in the stop valve body (1), and comprises a pre-starting valve core (2) and a pre-starting valve seat (12); the valve rod (5) and the main valve core (3) are movably connected in a split mode, and a spherical sealing structure is additionally arranged between the valve rod (5) and the main valve core (3) to avoid valve inner leakage caused by valve rod deformation; the lower part of the main valve core (3) is provided with a conical space, the pre-opening valve is arranged in the conical space at the lower part of the main valve core (3), and the valve rod (5) and the pre-opening valve core (2) are of an integrated structure; the pre-opening valve seat (12) is located in the middle of the conical space of the main valve core (3) and fixed on the inner wall of the main valve core (3), the pre-opening valve core (2) is movably connected with the pre-opening valve seat (12), and the pre-opening valve core (2) is lifted through the valve rod (5), so that the sealing surface (13) of the pre-opening valve core is tightly attached to the pre-opening valve seat (12), and the sealing effect is achieved.
2. The novel stop valve for the high-temperature high-pressure large-caliber power plant according to claim 1, is characterized in that: an elastic component (18) is arranged between the pre-opening valve core (2) and the pre-opening valve seat (12), the lower end of the elastic component (18) is tightly attached to the upper wall of the pre-opening valve core (2), the upper end of the elastic component (18) is tightly attached to the inner wall of the pre-opening valve seat (12), and the pre-opening valve core sealing surface (13) and the pre-opening valve seat (12) are kept to be separated under the action of no external force under the elastic force of the elastic component (18).
3. The novel stop valve for the high-temperature high-pressure large-caliber power plant according to claim 2, is characterized in that: the elastic part (18) is a disc spring.
4. The novel stop valve for high-temperature high-pressure large-caliber power plants according to claim 1 or 2, is characterized in that: the valve core sealing surface (13) of the pre-opening valve is a spherical sealing surface.
5. The novel stop valve for the high-temperature high-pressure large-caliber power plant according to claim 1, is characterized in that: a balance plate (19) is installed on the lower portion of the pre-opening valve core (2), the balance plate (19) is a cylinder, threads are formed in the outer surface of the cylinder and matched with internal threads of a conical space on the lower portion of the main valve core (3) and fixed in the main valve core (3), and a stopping check ring is installed behind the balance plate (19) installed in the conical space on the lower portion of the main valve core (3); the balance plate (19) is provided with a first balance hole (11) which penetrates through the balance plate from bottom to top, the main valve core (3) is provided with a second balance hole (17) which penetrates through the main valve core from bottom to top, and a balance channel is formed by the balance hole (11), a channel between the valve core sealing surface (13) of the pre-opening valve and the valve seat (12) of the pre-opening valve and the balance hole (17).
6. The novel stop valve for the high-temperature high-pressure large-caliber power plant according to claim 1, is characterized in that: the front of the main valve core (3) is provided with a guide cone, the coaxiality between the main valve core (3) and the main valve seat (4) is ensured through clearance fit of the guide cone and an inner hole of the main valve seat (4), and the main valve core (3) is lifted through the valve rod (5) so that the main valve core sealing surface (16) is tightly attached to the main valve seat sealing surface (15) to achieve the sealing effect.
7. The novel stop valve for the high-temperature high-pressure large-caliber power plant according to claim 1, is characterized in that: the valve cage of the stop valve is an integrated valve cage, namely the valve cage and the main valve seat (4) are combined into a whole, and the main valve seat sealing surface (15) is positioned at the joint of the lower end of the main valve seat (4) and the inner hole of the valve body (1).
8. The novel stop valve for high-temperature high-pressure large-caliber power plants according to claim 1, 6 or 7, is characterized in that: the main valve core sealing surface (16) is a spherical sealing surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020983582.0U CN212672406U (en) | 2020-06-02 | 2020-06-02 | Novel stop valve for high-temperature high-pressure large-caliber power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020983582.0U CN212672406U (en) | 2020-06-02 | 2020-06-02 | Novel stop valve for high-temperature high-pressure large-caliber power plant |
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| CN212672406U true CN212672406U (en) | 2021-03-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020983582.0U Active CN212672406U (en) | 2020-06-02 | 2020-06-02 | Novel stop valve for high-temperature high-pressure large-caliber power plant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113236789A (en) * | 2021-04-30 | 2021-08-10 | 华能海南发电股份有限公司东方电厂 | Prevent steam turbine governing valve rod structure that splits |
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2020
- 2020-06-02 CN CN202020983582.0U patent/CN212672406U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113236789A (en) * | 2021-04-30 | 2021-08-10 | 华能海南发电股份有限公司东方电厂 | Prevent steam turbine governing valve rod structure that splits |
| CN113236789B (en) * | 2021-04-30 | 2022-12-27 | 华能海南发电股份有限公司东方电厂 | Prevent steam turbine governing valve rod structure that splits |
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