CN111623130A - High-temperature and high-pressure stop valve based on labyrinth seal - Google Patents
High-temperature and high-pressure stop valve based on labyrinth seal Download PDFInfo
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- CN111623130A CN111623130A CN202010581364.9A CN202010581364A CN111623130A CN 111623130 A CN111623130 A CN 111623130A CN 202010581364 A CN202010581364 A CN 202010581364A CN 111623130 A CN111623130 A CN 111623130A
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- clack
- sealing
- annular
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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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/36—Valve members
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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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
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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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/42—Valve seats
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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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K41/00—Spindle sealings
- F16K41/02—Spindle sealings with stuffing-box ; Sealing rings
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lift Valve (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Abstract
The invention provides a high-temperature and high-pressure stop valve based on labyrinth seal, which comprises a valve body, a valve rod, a valve seat and a valve clack, wherein the valve rod is arranged by extending into the valve body in a threaded fit manner; the valve clack is in a disc structure, the upper end face of the valve clack is provided with a valve rod connecting part, the valve rod connecting part is connected with the lower end of the valve rod, the lower end face of the valve rod connecting part forms a valve clack sealing surface, and the valve clack sealing surface is coaxially provided with a plurality of annular valve clack sealing teeth which are sequentially arranged at intervals along the radial direction; the valve seat is provided with a valve seat sealing surface matched with the valve clack sealing surface; the valve seat sealing surface is also provided with a plurality of annular valve seat sealing teeth which are sequentially arranged at intervals along the radial direction; when the stop valve is opened, the valve rod rotates outwards relative to the valve body, the annular valve clack sealing teeth are separated from the annular valve seat sealing teeth, and the valve clack is separated from the valve seat; when the stop valve is closed, the valve rod rotates inwards relative to the valve body, the valve clack is in contact sealing with the valve seat, and the annular valve clack sealing teeth and the annular valve seat sealing teeth are spliced and closed to form a labyrinth sealing pair structure.
Description
Technical Field
The invention relates to the field of thermodynamic systems of power stations, in particular to a high-temperature and high-pressure stop valve based on labyrinth seal.
Background
The stop valve is widely applied to a high-temperature and high-pressure steam system of a power station, and also applied to systems such as water supply, fuel oil, air and the like. The cut-off valve realizes the cut-off control of the medium flow by the closing of the valve clack.
More stop valves are arranged in a thermodynamic system of the generator set, after the stop valves are operated for a long time, valve clacks and valve seat sealing surfaces of the stop valves are abraded, the tightness is reduced, and medium leakage exists. The influence of the internal leakage of a thermodynamic system of a thermal power generating unit on the economic efficiency of the unit is 0.5g/(kW & h) -3 g/(kW & h) on average. The higher the steam quality, the greater the impact of its leakage on the unit economics. The valve that leaks in needs to grind the processing, has increased the maintenance work load.
The sealing between the valve clack and the valve seat of the conventional power station thermodynamic system mainly comprises the following three modes of (1) plane sealing. The sealing surface of the valve body and the sealing surface of the valve clack are both planes, and the sealing mode has the advantages of simple manufacturing process, difficulty in eliminating surface unevenness, difficulty in ensuring flatness and possibility of leakage. (2) And sealing the conical surface. The sealing surface of the valve body and the sealing surface of the valve clack are both conical, and the sealing mode has the advantages that sundries are not easy to accumulate on the sealing surfaces, and has the defect that the valve clack is easy to deflect and cause leakage when the axial force action point of the valve rod is not coincident with the central line of the conical surface of the valve clack and the central line of the conical surface of the valve seat due to the narrow sealing surface of the. (3) The spherical surface is sealed, the sealing surface of the valve seat is a conical surface, the valve clack is a rotatable ball body, and the sealing mode is suitable for valves with smaller apertures.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the high-temperature and high-pressure stop valve based on the labyrinth seal, the gaps exist among the seal teeth, the abrasion is reduced, the labyrinth seal structure is formed by the staggered arrangement, the tightness is improved, and the internal leakage of a medium in the stop valve is avoided.
The invention is realized by the following technical scheme:
a high-temperature and high-pressure stop valve based on labyrinth seal comprises a valve body, a valve rod, a valve seat and a valve clack, wherein the valve rod is arranged by extending into the valve body in a threaded fit manner;
the valve clack is in a disc structure, the upper end face of the valve clack is provided with a valve rod connecting part, the valve rod connecting part is connected with the lower end of the valve rod, the lower end face of the valve rod connecting part forms a valve clack sealing surface, and the valve clack sealing surface is coaxially provided with a plurality of annular valve clack sealing teeth which are sequentially arranged at intervals along the radial direction;
the valve seat is provided with a valve seat sealing surface matched with the valve clack sealing surface; the valve seat sealing surface is also provided with a plurality of annular valve seat sealing teeth which are sequentially arranged at intervals along the radial direction;
when the stop valve is opened, the valve rod rotates outwards relative to the valve body, the annular valve clack sealing teeth are separated from the annular valve seat sealing teeth, and the valve clack is separated from the valve seat;
when the stop valve is closed, the valve rod rotates inwards relative to the valve body, the valve clack is in contact sealing with the valve seat, and the annular valve clack sealing teeth and the annular valve seat sealing teeth are spliced and closed to form a labyrinth sealing pair structure.
Preferably, the valve seat further comprises a valve seat upper plate and a valve seat lower baffle plate which are arranged on two sides of the valve seat sealing surface, and the valve seat sealing surface is provided with a medium through hole which is coaxial with the valve clack.
Preferably, the number of the ring rings of the sealing teeth of the annular valve clack and the sealing teeth of the annular valve seat is respectively more than 3.
Preferably, the distance between the sealing teeth of the adjacent annular valve clacks and the distance between the sealing teeth of the adjacent annular valve seats are both 10 mm.
Preferably, the annular valve clack sealing teeth and the annular valve seat sealing teeth are inserted in a staggered mode, and a tooth gap of 0.5-1mm exists in the radial direction.
Preferably, the height of the annular valve clack sealing tooth and the height of the annular valve seat sealing tooth are both larger than 30 mm.
Preferably, the annular valve clack sealing teeth and the annular valve seat sealing teeth are made of stainless steel or hard alloy.
Preferably, the upper part of the valve rod is provided with an extrusion thread, and the extrusion thread is arranged outside the valve body.
Furthermore, the upper extrusion thread of the valve rod and the internal thread of the upper sheath of the packing gland form a thread pair.
Preferably, the valve stem is at 90 ° to the incoming flow centerline of the media.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention provides a high-temperature and high-pressure stop valve based on labyrinth seal, which is characterized in that annular seals arranged on sealing surfaces of a valve seat and a valve clack which are fixedly arranged in a valve body are meshed to form a labyrinth seal pair structure, and the labyrinth seal pair structure ensures tight isolation of high-temperature and high-pressure media through a multi-stage throttling effect; after the medium passes through each sealing tooth, the pressure of the working medium is reduced, and after the medium passes through a plurality of annular sealing teeth, more multi-stage pressure reduction is realized so as to realize tight isolation of high-temperature and high-pressure media.
Further, the valve seat further comprises a valve seat upper plate and a valve seat lower baffle plate which are arranged on two sides of the sealing surface of the valve seat, the stability of the valve seat in the valve body is improved, and a medium through hole which is coaxial with the valve clack is arranged on the sealing surface of the valve seat, so that a medium can flow into the valve seat conveniently.
Further, the number of the annular rings of the sealing teeth of the annular valve clack and the sealing teeth of the annular valve seat is respectively more than 3 pairs, and the specific number is determined according to the medium pressure grade, so that the effect of multistage pressure reduction is realized, the sealing performance between the sealing teeth is improved, and the risk of internal leakage is reduced.
Furthermore, the distance between the adjacent annular valve clack sealing teeth and the distance between the adjacent annular valve seat sealing teeth are both 10mm, the heights of the annular valve clack sealing teeth and the annular valve seat sealing teeth are both larger than 30mm, the valve clack sealing teeth and the annular valve seat sealing teeth are spliced in a staggered mode, and a tooth gap of 0.5-1mm exists along the radial direction, and the valve clack sealing teeth are specifically determined according to the surface unevenness of the sealing teeth, so that the dual functions of isolating media and enabling the valve clack to move up and down are achieved, the tightness of the stop valve is further guaranteed, the annular valve clack sealing teeth and the annular valve seat sealing teeth are made of stainless steel or hard alloy, the service life of the sealing teeth is prolonged, and abrasion caused by.
Furthermore, the upper portion of the valve rod is provided with an extrusion thread, the extrusion thread is arranged outside the valve body and is not in direct contact with a medium, the extrusion thread of the valve rod is guaranteed not to be corroded by the medium, and operation is convenient.
Furthermore, the upper extrusion thread of the valve rod and the internal thread of the upper sheath of the packing gland form a thread pair, so that the connectivity of the valve rod in the valve body is improved.
Furthermore, the valve rod and the incoming flow center line of the medium in the valve body form a 90-degree angle, and the tightness of the medium in the stop valve is increased.
Drawings
FIG. 1 is a schematic view of the valve flap according to an embodiment of the present disclosure;
FIG. 2 is a schematic section A-A of the valve flap of FIG. 1;
FIG. 3 is a schematic diagram of an open state of the high-temperature and high-pressure stop valve based on the labyrinth seal in the embodiment of the invention;
FIG. 4 is a schematic diagram of a closed state of the high-temperature and high-pressure stop valve based on the labyrinth seal in the embodiment of the invention.
In the figure: 1 is a valve body; 2 is a valve cover; 3 is a valve rod; 4 is a valve clack; 5 is a valve seat; 6 is a filler; 7 is a sealing gasket; 8 is a valve clack sealing tooth; 9 is a valve seat sealing tooth; 10 is a screw thread; 11 is a bolt; 12 is a nut; 13 is an extrusion thread; 14 is a flange; 15 is a hand wheel; 16 is a packing gland; 41 is a valve rod connecting part; 42 is a valve clack sealing surface; 51 is a valve seat sealing surface; 52 is a valve seat upper baffle plate; and 53 is a valve seat lower baffle.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
Examples
The invention provides a high-temperature and high-pressure stop valve based on labyrinth seal, which comprises a valve body 1, a valve rod 3, a valve seat 5 and a valve clack 4, wherein the valve rod 3 is arranged by extending into the valve body 1 in a threaded fit manner, and the valve seat 5 and the valve clack 4 are fixedly arranged in the valve body 1;
as shown in fig. 1, the valve flap 4 is a disc structure, the upper end surface of the valve flap 4 is provided with a valve rod connecting part 41, the valve rod connecting part 41 is connected with the thread 10 at the lower end of the valve rod 3, and the lower end surface forms a valve flap sealing surface 42;
as shown in fig. 2, a plurality of annular flap sealing teeth 8 which are arranged in a clearance manner along the radial direction are coaxially arranged on the flap sealing surface 42;
the valve seat 5 is provided with a valve seat sealing surface 51 matched with the valve clack sealing surface 42; the valve seat sealing surface 51 is also provided with a plurality of annular valve seat sealing teeth 9 which are sequentially arranged at intervals along the radial direction;
when the shut-off valve is open, the valve stem 3 is rotated outwards relative to the valve body 1, the annular flap sealing tooth 8 is separated from the annular valve seat sealing tooth 9, and the flap 4 is separated from the valve seat 5, as shown in fig. 3;
when the stop valve is closed, the valve rod 3 rotates inwards relative to the valve body 1, the valve clack 4 is in contact sealing with the valve seat 5, and the annular valve clack sealing tooth 8 and the annular valve seat sealing tooth 9 are inserted and closed to form a labyrinth sealing pair structure, as shown in fig. 4.
In order to realize the effect of multi-stage pressure reduction, the number of the annular valve clack sealing teeth 8 and the annular valve seat sealing 9 is more than 3, and the specific number depends on the pressure grade of a medium. The distance between the adjacent annular valve clack sealing teeth 8 and the distance between the adjacent annular valve seat sealing teeth 9 are both 10mm, and the heights of the annular valve clack sealing teeth 8 and the annular valve seat sealing teeth 9 are both larger than 30 mm. The annular valve clack sealing teeth 8 and the annular valve seat sealing teeth 9 are inserted in a staggered mode, a tooth gap of 0.5-1mm exists in the radial direction, and the tooth gap is determined by the surface unevenness of the sealing teeth so as to play a double role of isolating media and the valve clack 4 from moving up and down; the annular valve clack sealing teeth 8 and the annular valve seat sealing teeth 9 adopt stainless steel or hard alloy.
The valve seat 5 further comprises a valve seat upper plate 52 and a valve seat lower baffle plate 53 which are arranged on two sides of the valve seat sealing surface 51, and a medium through hole which is coaxial with the valve clack 4 is formed in the valve seat sealing surface 51, so that a medium can conveniently flow in.
The upper end of the valve rod 3 is connected with the hand wheel 15, the lower end of the valve rod 3 is in threaded connection with the valve rod connecting part 41 at the upper end of the valve clack 4, if the valve rod 3 or the valve seat 5 has the defects of abrasion, cracks, bending and the like after long-term operation, the disassembly and replacement of parts can be realized through a threaded connection pair.
The valve rod 3 and the incoming flow center line of the medium in the stop valve are 90 degrees, so that the high-temperature and high-pressure stop valve has flow resistance; the valve body 1 is connected with the valve cover 2 through the flange 14 or threads, when the valve body and the valve cover are connected through the flange 14, the flange 14 is provided with the bolt 11 and the nut 12, the bolt 11 is fixedly connected with the nut 12 in a matched mode, the sealing gasket 7 is arranged between the combining surface of the valve body 1 and the valve cover 2, and the sealing performance between the valve body 1 and the valve cover 2 is effectively improved.
The valve rod 3 is provided with an extrusion thread 13, the extrusion thread 13 is arranged outside the valve body 1, the extrusion thread 13 and a sheath internal thread on the upper part of a packing gland 16 form a thread pair, a packing 6 is arranged between the joint of the valve rod 3 and the valve cover 2, the packing 6 is compressed through the packing gland 16, and the packing 6 is made of plastic, carbon fiber, flexible graphite and the like.
The high-temperature high-pressure stop valve is mainly used on a thermodynamic system pipeline of a power station, working media can be high-temperature steam, water supply, fuel oil and air, and the high-temperature high-pressure stop valve can be connected with the pipeline through a flange 14 and can also be directly welded with the pipeline.
When the high-temperature high-pressure steam stop valve is used, the valve clack 4 needs large force for opening and closing because of high medium pressure grade, so the high-temperature high-pressure steam stop valve driving device can be provided with an electric driving device and a pneumatic driving device.
Claims (10)
1. A high-temperature and high-pressure stop valve based on labyrinth seal is characterized by comprising a valve body (1), a valve rod (3) which is arranged by extending into the valve body (1) in a threaded fit manner, and a valve seat (5) and a valve clack (4) which are fixedly arranged in the valve body (1);
the valve clack (4) is of a disc structure, a valve rod connecting part (41) is arranged on the upper end face of the valve clack (4), the valve rod connecting part (41) is connected with the lower end of the valve rod (3), a valve clack sealing surface (42) is formed on the lower end face, and a plurality of annular valve clack sealing teeth (8) which are sequentially arranged at intervals along the radial direction are coaxially arranged on the valve clack sealing surface (42);
a valve seat sealing surface (51) matched with the valve clack sealing surface (42) is arranged on the valve seat (5); the valve seat sealing surface (51) is also provided with a plurality of annular valve seat sealing teeth (9) which are sequentially arranged at intervals along the radial direction;
when the stop valve is opened, the valve rod (3) rotates outwards relative to the valve body (1), the annular valve clack sealing teeth (8) are separated from the annular valve seat sealing teeth (9), and the valve clack (4) is separated from the valve seat (5);
when the stop valve is closed, the valve rod (3) rotates inwards relative to the valve body (1), the valve clack (4) is in contact sealing with the valve seat (5), and the annular valve clack sealing teeth (8) and the annular valve seat sealing teeth (9) are plugged and closed to form a labyrinth sealing pair structure.
2. A high-temperature high-pressure stop valve based on labyrinth seal according to claim 1, characterized in that the valve seat (5) further comprises a valve seat upper plate (52) and a valve seat lower baffle plate (53) which are arranged at two sides of the valve seat sealing surface (51), and the valve seat sealing surface (51) is provided with a medium through hole which is coaxial with the valve clack (4).
3. A high-temperature high-pressure stop valve based on labyrinth seal according to claim 1, characterized in that the number of the ring-shaped valve clack sealing teeth (8) and the ring-shaped valve seat sealing teeth (9) is respectively more than 3.
4. A high-temperature and high-pressure stop valve based on labyrinth seal according to claim 1, characterized in that the spacing between the adjacent annular valve clack seal teeth (8) and the spacing between the adjacent annular valve seat seal teeth (9) are both 10 mm.
5. A high-temperature high-pressure stop valve based on labyrinth seal according to claim 1, characterized in that the annular valve clack sealing teeth (8) and the annular valve seat sealing teeth (9) are inserted in a staggered manner, and a tooth gap of 0.5-1mm exists in the radial direction.
6. A high-temperature and high-pressure stop valve based on labyrinth seal according to claim 1, characterized in that the height of the annular valve clack sealing tooth (8) and the annular valve seat sealing tooth (9) are both greater than 30 mm.
7. A high-temperature high-pressure stop valve based on labyrinth seal according to claim 1, characterized in that the annular valve clack seal teeth (8) and the annular valve seat seal teeth (9) are made of stainless steel or hard alloy.
8. A high-temperature and high-pressure stop valve based on labyrinth seal according to claim 1, characterized in that the upper part of the valve rod (3) is provided with a squeezing thread (13), and the squeezing thread (13) is arranged outside the valve body (1).
9. A high temperature and high pressure stop valve based on labyrinth seal according to claim 8 characterized in that the upper extrusion thread (13) of the valve stem (3) and the internal thread of the upper sheath of the packing gland (16) form a thread pair.
10. A high-temperature and high-pressure stop valve based on labyrinth seal according to claim 1, characterized in that the valve rod (3) is 90 ° to the incoming flow center line of the medium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010581364.9A CN111623130A (en) | 2020-06-23 | 2020-06-23 | High-temperature and high-pressure stop valve based on labyrinth seal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010581364.9A CN111623130A (en) | 2020-06-23 | 2020-06-23 | High-temperature and high-pressure stop valve based on labyrinth seal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111623130A true CN111623130A (en) | 2020-09-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010581364.9A Pending CN111623130A (en) | 2020-06-23 | 2020-06-23 | High-temperature and high-pressure stop valve based on labyrinth seal |
Country Status (1)
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| CN (1) | CN111623130A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115899345A (en) * | 2023-01-16 | 2023-04-04 | 宁波佳明金属制品有限公司 | Self-closing valve for pipeline |
| CN116104950A (en) * | 2023-04-13 | 2023-05-12 | 哈电集团哈尔滨电站阀门有限公司 | Steam stop valve with combined valve clack |
-
2020
- 2020-06-23 CN CN202010581364.9A patent/CN111623130A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115899345A (en) * | 2023-01-16 | 2023-04-04 | 宁波佳明金属制品有限公司 | Self-closing valve for pipeline |
| CN116104950A (en) * | 2023-04-13 | 2023-05-12 | 哈电集团哈尔滨电站阀门有限公司 | Steam stop valve with combined valve clack |
| CN116104950B (en) * | 2023-04-13 | 2023-06-20 | 哈电集团哈尔滨电站阀门有限公司 | Steam stop valve with combined valve clack |
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