CN111043323A - Valve sealing structure capable of reducing abrasion and method thereof - Google Patents
Valve sealing structure capable of reducing abrasion and method thereof Download PDFInfo
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- CN111043323A CN111043323A CN201911423814.5A CN201911423814A CN111043323A CN 111043323 A CN111043323 A CN 111043323A CN 201911423814 A CN201911423814 A CN 201911423814A CN 111043323 A CN111043323 A CN 111043323A
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- valve rod
- snap ring
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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
- F16K1/02—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 with screw-spindle
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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
- F16K1/46—Attachment of sealing rings
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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
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Valves (AREA)
- Lift Valve (AREA)
Abstract
The invention provides a valve sealing structure capable of reducing abrasion and a method thereof, belonging to the field of valves. The sealing structure comprises an upper loading sealing device, a lower loading sealing device and a driving device, wherein the upper loading sealing device and the lower loading sealing device are matched with each other under the action of the driving device, so that when the valve rod moves, the loading device unloads the filler, the filler abrasion of the sealing device is reduced, and the service life of the sealing device is prolonged; the filling material is in a gradually loading state at the two moments of the valve to be fully opened and closed; at the time of full opening and closing of the valve, the filler is in a loading completion state, and a good sealing effect is achieved.
Description
Technical Field
The invention relates to the technical field of sealing structures, in particular to a reciprocating contact type dynamic sealing and stuffing box sealing structure.
Background
In valves such as stop valves, the valve rod is driven to open and close the valve, and in the case of manually operated valves, the valve rod is often driven by the rotation of threads, so that there is movement and friction between the valve rod and the packing, thereby causing the wear of the packing. Once the filler is worn for a long time, the consumption of the filler and the wear damage of a sealing surface can be caused, so that the compression degree of a filler pressing plate is not enough, the problem of sealing failure is caused, the working medium is leaked, equipment accidents can occur, and even the serious consequence of personnel damage can be caused.
The existing valve rod packing sealing device adopts a mode of increasing pretightening force, solves the problem that the leakage rate of the valve at the position is larger, and is widely applied to the field of valve rod packing sealing structures. However, the device has the problems of large abrasion loss of the filler, frequent disassembly and replacement of the filler and the like. The patents disclosed in the present stage mainly surround high-pressure automatic pre-tightening sealing devices and the like, but there are fewer patents for reducing wear of the packing and improving the service life of the seal.
Along with the development of the technology, the industry puts forward more strict requirements on sealing, frequent replacement, disassembly and replacement of sealing packing can cause the rise of maintenance cost, and in order to save the maintenance cost, the research on the sealing of the valve at the present stage not only requires high reliability of sealing, but also requires long-term service life. Therefore, the research on the sealing structure which is suitable for being good in sealing effect and long in service life is of great significance.
Disclosure of Invention
The invention aims to provide a valve rod and packing box sealing structure, wherein a packing is compressed under full opening and full closing through an upper loading device and a lower loading device, so that the sealing performance of the valve is improved; reduce the compression to the packing when the valve rod moves about for elastic force reduces between packing and the valve rod, thereby reduces the wearing and tearing to the packing, reaches that the leakproofness is good and prolongs valve rod department and seals life's effect.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a valve sealing structure for reducing abrasion comprises a rotating wheel, a fixed baffle, a movable gland, a valve cover, a spring group, a filler, a movable sleeve, a valve rod, a valve body and a valve core;
the valve cover is fixed on the valve body, an axial through channel in the valve cover is provided with a two-step end surface, a stuffing box channel is arranged between the first vertical circular step end surface and the first horizontal annular step end surface, and a movable sleeve is arranged on the first horizontal annular step end surface; a valve rod middle clamping ring channel is arranged between the second vertical circular step end face and the second horizontal annular step end face; an internal thread is tapped on the inner side of the end face of the third vertical round step;
the rotating wheel is fixedly connected with a valve rod, the valve rod is sequentially provided with an upper snap ring, a middle snap ring and a lower thread which move synchronously from top to bottom, the bottom end of the valve rod penetrates through an axial through channel of a valve cover of the valve and is connected with a valve core, and the lower thread on the valve rod is an external thread and forms a screw pair driving the valve rod to move axially with the internal thread;
the fixed baffle is fixedly connected with the valve cover of the valve; the movable gland is coaxially sleeved on the valve rod and consists of an annular body and an embedded part, the embedded part and the stuffing box channel form an axial sliding pair, and the annular body is limited between the fixed baffle and the valve cover of the valve; the spring group is arranged below the movable gland, the stuffing is filled in a stuffing box channel between the spring group and the movable sleeve, and two ends of the spring group are respectively supported on the lower surface of the movable gland and the upper surface of the stuffing; the movable gland, the spring group, the packing and the movable sleeve are all limited to move in a packing box channel outside the valve rod;
the movable gland is provided with a first protruding part, the first protruding part is positioned on a downward moving path of the upper clamping ring, and the movable gland is driven to move downwards by pushing the first protruding part in the process that the upper clamping ring moves downwards along with the valve rod;
the movable sleeve is provided with a second protruding part, the second protruding part is positioned on an upward moving path of the middle snap ring, and the middle snap ring drives the movable sleeve to move upwards by pushing the second protruding part in the process of moving upwards along with the valve rod;
when the valve rod moves downwards to the limit position, the valve core completely closes a water flow channel in the valve, the movable sleeve is attached to the end face of the first horizontal annular step, the middle clamping ring is separated from the second protruding portion, and the upper clamping ring enables the spring group and the filler to be in a compressed state by pushing the movable gland;
when the valve rod moves upwards to the limit position, the valve core completely opens a water flow channel in the valve, the top of the movable gland is attached to the fixed baffle, the upper clamping ring is separated from the first protruding portion, and the middle clamping ring enables the spring group and the filler to be in a compressed state by pushing the movable sleeve.
Preferably, a first inner through groove with the diameter larger than the outer diameter of the snap ring on the valve rod is arranged in the movable gland, the first protruding portion is a first annular body coaxially arranged at the bottom of the first inner through groove, and the inner diameter of the first annular body is smaller than the outer diameter of the snap ring on the valve rod.
Preferably, a second inner through groove with the diameter larger than the outer diameter of the clamping ring in the valve rod is formed in the movable sleeve, the second boss is a second annular body coaxially arranged at the top of the second inner through groove, and the inner diameter of the second annular body is smaller than the outer diameter of the clamping ring in the valve rod.
Preferably, the outer diameter of the upper snap ring of the valve rod is equal to the outer diameter of the middle snap ring and is larger than the nominal diameter of the lower thread.
Preferably, the fixed baffle is a cover body with a through hole, and the cover body is hollow and is used as a moving space of the movable gland.
Preferably, the fixed baffle is fixed on the top of the valve cover of the valve through a bolt group.
Preferably, the spring pack and packing are under maximum compression when the valve stem is moved up or down to an extreme position.
Preferably, the lower end of the valve cover of the valve is provided with a flange which is fixed on the valve body of the valve.
Preferably, the stuffing is filled in a stuffing box channel between the spring group and the movable sleeve to form a movable seal.
Another object of the present invention is to provide a wear-reducing valve sealing method using the valve sealing structure according to any one of the above aspects, comprising the steps of:
when the control valve is opened from a closed position to a turned position, the valve rod is controlled to rise by rotating the rotating wheel; the movable gland moves upwards under the action of the spring group, so that the compression amount of the packing is gradually reduced, after the valve is opened to a certain degree, the movable gland is limited by the fixed baffle to reach the top end, the compression amount of the packing is minimized, the specific pressure of the packing and the valve rod is reduced, and the abrasion of the packing in the motion process of the valve rod is reduced; when the valve rod continues to ascend, the middle clamping ring on the valve rod enters the second inner through groove of the movable sleeve, and the movable sleeve is pushed to move upwards along with the valve rod through the second protruding part, so that the filler is extruded again; when the valve rod moves to the top end, the packing is in the maximum compression state, the specific pressure of the packing and the valve rod reaches the maximum, and the sealing effect is enhanced;
when the control valve is turned from opening to closing, the valve rod is controlled to descend by rotating the rotating wheel; the movable sleeve moves downwards under the action of the spring force, so that the compression amount of the spring group is gradually reduced, when the valve is closed to a certain degree, the movable sleeve reaches the bottommost end and is attached to the end face of the first horizontal annular step, the compression amount of the filler is minimized, the specific pressure of the filler and the valve rod is reduced, and the abrasion of the filler when the valve rod moves is reduced; when the valve rod continues to descend, the upper clamping ring on the valve rod enters the first inner through groove of the movable gland, the movable gland is pushed to move downwards along with the valve rod through the first protruding part, and the packing is extruded again; when the valve rod moves to the bottommost end, the packing is in the maximum compression state, and the sealing effect is enhanced.
The invention has the beneficial effects that:
according to the valve sealing structure capable of reducing wear, the internal threads of the valve cover of the valve and the lower threads of the valve rod are matched with each other to form a driving device, and the movable gland, the spring group, the packing and the upper clamping ring of the valve rod form an upper loading device for packing sealing; the movable sleeve and the clamping ring in the valve rod form a lower loading device for packing sealing. The upper loading device and the lower loading device are matched with each other, so that when the valve is opened and closed, the spring set is compressed to form forced sealing, pressing force is applied to the sealing filler, the pre-tightened filler is compressed, uneven microgaps on a sealing surface between the valve rod and the filler are filled, the pre-tightening specific pressure on the sealing surface is increased, the medium leakage is prevented, and the sealing surface is kept in a good sealing state.
Because the packing gasket has enough resilience, the upper loading device and the lower loading device are matched with each other, so that when the valve is in a motion state, the packing rebounds, the pre-tightening specific pressure on the sealing surface is reduced, and the abrasion of the packing in the motion state is reduced.
The invention is especially suitable for low-pressure, medium-pressure and medium-small diameter valves, not only improves the sealing effect, but also prolongs the service life of the sealing device.
Drawings
In order that the disclosure of the invention may be more readily understood, reference is now made to the following detailed description of the invention taken in conjunction with the accompanying drawings and examples, in which:
fig. 1 is a schematic view of the wear-reducing valve seal.
Fig. 2 is a schematic structural diagram of a valve cover of the valve.
The reference numbers in the figures are as follows:
1. a rotating wheel; 2. fixing a baffle plate; 3. a movable gland; 4. a valve cover of the valve; 5. a spring set; 6. a bolt group; 7. a filler; 8. a movable sleeve; 9. a valve stem; 10. a valve body; 11. a valve core; 12-lower thread;
13-internal screw thread; 14-middle snap ring; 15-a second inner through groove; 16-a first inner through groove; 17-upper snap ring.
Detailed Description
The invention will be described in further detail below with reference to the drawings, but the scope of the invention is not limited thereto.
As shown in fig. 1, a wear-reducing valve sealing structure according to a preferred embodiment of the present invention mainly includes a runner 1, a fixed baffle 2, a movable gland 3, a valve cover 4, a spring set 5, a packing 7, a movable sleeve 8, a valve rod 9, a valve body 10, and a valve core 11.
The fixed baffle 2 is a cover body with a through hole, the inside of the cover body is hollow, and the cover body is used as a moving space of the movable gland 3. Fixed stop 2 is fixed in valve gap 4 top through bolt group 6, and valve gap 4 lower extreme sets up the flange, is fixed in valve body 10 through the flange. An axial through channel is arranged in the valve cover 4. As shown in fig. 2, the axial through channel has two stepped end faces, and the end faces are formed by connecting a first vertical circular step end face a, a first horizontal annular step end face B, a second vertical circular step end face C, a second horizontal annular step end face D, and a third vertical circular step end face E from top to bottom in sequence. A stuffing box channel is arranged between the first vertical circular step end face A and the first horizontal annular step end face B, and a movable sleeve 8 is arranged on the first horizontal annular step end face B; a middle clamping ring channel of the valve rod is arranged between the second vertical circular step end surface C and the second horizontal annular step end surface D; and an internal thread 13 is tapped on the inner side of the third vertical circular step end face E.
The runner 1 is fixedly connected with the valve rod 9 and is used for driving the valve rod 9 to rotate. The valve rod 9 is provided with an upper snap ring 17, a middle snap ring 14 and a lower thread 12 from top to bottom in sequence, and the outer diameter of the upper snap ring 17 of the valve rod 9 is equal to that of the middle snap ring 14 and is larger than the nominal diameter of the lower thread 12. Wherein, the upper snap ring 17 and the middle snap ring 14 are fixed with the valve rod 9 and move up and down synchronously, and the lower thread 12 is an external thread tapped on the outer side of the valve rod 9. The valve rod 9 penetrates through the movable gland 3, the axial through channel of the valve bonnet 4 and the rear bottom end of the movable sleeve 8 to be fixedly connected with the valve core 11, the lower thread 12 on the valve rod 9 is an external thread, and the lower thread 12 and the internal thread 13 form a screw pair driving the valve rod 9 to axially move. The valve rod 9 can move up and down along the axial through channel of the valve bonnet 4 under the driving of the screw pair through the rotating wheel 1, and then the valve core 11 is controlled to open and close the water flow channel of the valve.
The movable gland 3 is coaxially sleeved on the valve rod 9, and the movable gland 3 consists of a ring body and an embedded part. The embedded part is embedded into the stuffing box channel, the embedded part and the stuffing box channel form a sliding pair which moves up and down axially, and the outer diameter of the annular body is larger than the diameter of the stuffing box channel and the diameter of the through hole of the fixed baffle 2, so that the up-and-down movement of the annular body is limited between the fixed baffle 2 and the valve cover 4. The spring group 5 is arranged below the movable gland 3, the stuffing 7 is filled in a stuffing box channel between the spring group 5 and the movable sleeve 8, and two ends of the spring group 5 are respectively supported on the lower surface of the movable gland 3 and the upper surface of the stuffing 7. The packing 7 should fill the stuffing box channel between the spring nest 5 and the movable sleeve 8 to form a movable seal, and the compression degree of the spring nest 5 changes the compression degree of the packing 7, thereby adjusting the sealing specific pressure between the packing 7 and the valve rod 9. It is to be noted that the insert part of the movable gland 3, the spring pack 5, the packing 7 and the movable sleeve 8 are all restricted to move in the stuffing box channel outside the valve stem 9.
In the invention, the compression degree of the spring set 5 and the packing 7 is not fixed, but is changed along with different moving states of the valve rod 9, so that the problems of large wear of the packing or poor sealing are solved. The invention mainly realizes the effect through the matching of the movable gland 3, the movable sleeve 8, the upper snap ring 17 and the middle snap ring 14.
Wherein, be equipped with first bellying on the activity gland 3, first bellying is located the downward moving route that needs be located snap ring 17, goes up snap ring 17 along with the in-process that valve rod 9 moved down, drives activity gland 3 through promoting first bellying and move down. In this embodiment, the movable gland 3 is provided with a first through groove 16 having a diameter larger than the outer diameter of the snap ring 17 on the valve stem, so that the first protruding portion is a first annular body coaxially disposed at the bottom of the first through groove 16, and the inner diameter of the first annular body is smaller than the outer diameter of the snap ring 17 on the valve stem. Therefore, when the upper snap ring 17 touches the first annular body, the downward movement process of the valve rod 9 can push the movable gland 3 to move downwards, and the upward movement of the valve rod 9 is not limited by the first annular body.
Similarly, the movable sleeve 8 is provided with a second protruding portion, the second protruding portion is located on an upward moving path of the middle snap ring 14, and the middle snap ring 14 drives the movable sleeve 8 to move upward by pushing the second protruding portion in the process of moving upward along with the valve rod 9. In this embodiment, the movable sleeve 8 is provided with a second through groove 15 having a diameter larger than the outer diameter of the snap ring 14 in the valve stem, so that the second protrusion is a second annular body coaxially disposed at the top of the second through groove 15, and the inner diameter of the second annular body is smaller than the outer diameter of the snap ring 14 in the valve stem. Therefore, when the middle snap ring 14 touches the second annular body in the upward movement process of the valve rod 9, the movable sleeve 8 can be pushed to move upwards by the second annular body, and the downward movement of the valve rod 9 is not limited by the second annular body.
In order to take account of the sealing performance of the valve and the abrasion damage of the packing, the positions and the distances of the upper snap ring 17 and the middle snap ring 14 on the valve rod 9 are reasonably designed. In the invention, when the valve rod 9 moves downwards to the extreme position, the valve core 11 completely closes the water flow channel in the valve, the movable sleeve 8 is attached to the first horizontal annular step end surface B, the middle snap ring 14 is separated from the second bulge, a certain distance is kept between the two, and the upper snap ring 17 enables the spring set 5 and the packing 7 to be in a compressed state by pushing the movable gland 3. When the valve rod 9 moves upwards to the limit position, the valve core 11 completely opens a water flow channel in the valve, the top of the movable gland 3 is attached to the top wall of the fixed baffle plate 2, the upper snap ring 17 is separated from the first protruding portion, a certain distance is kept between the upper snap ring and the first protruding portion, and the middle snap ring 14 enables the spring group 5 and the filler 7 to be in a compressed state by pushing the movable sleeve 8.
In order to ensure as good a seal as possible, the packing 7 and the valve rod 9 are no longer sliding relative to each other when the valve rod 9 is moved up or down to the limit position, the spring pack 5 and the packing 7 preferably being under maximum compression.
Based on the valve sealing structure, the invention also provides a valve sealing method for reducing abrasion, which comprises the following steps:
when the control valve is turned from closing to opening, the rotating wheel 1 is rotated anticlockwise, and the valve rod 9 begins to rise under the driving of the rotating wheel 1. The movable gland 3 moves upwards under the action of the spring group 5, the compression amount of the packing 7 is gradually reduced at the moment, after the valve is opened to a certain degree, the movable gland 3 is limited by the fixed baffle 2 to reach the topmost end, the compression amount of the packing 7 reaches the minimum at the moment, and the specific pressure of the packing 7 and the valve rod 9 is reduced, so that the effect of reducing the abrasion of the valve rod on the packing when the valve rod moves is achieved.
When the valve rod 9 continues to ascend, the middle snap ring 14 on the valve rod 9 enters the second inner through groove 15 of the movable sleeve 8, the movable sleeve 8 is pushed to move upwards along with the valve rod 9 through the second convex part, and the packing 7 is squeezed again at the moment; when the valve rod 9 moves to the top end, the packing 7 is in the maximum compression state, and the specific pressure between the packing 7 and the valve rod 9 reaches the maximum, so that the sealing effect is enhanced;
when the control valve is turned from the opening direction to the closing direction, the rotating wheel 1 is rotated clockwise, and the valve rod 9 is driven by the rotating wheel 1 to descend. The movable sleeve 8 moves downwards under the action of the spring force, the compression amount of the spring group 5 is gradually reduced at the moment, when the valve is closed to a certain degree, the movable sleeve 8 reaches the first horizontal annular stepped end face B attached to the bottommost end, the compression amount of the filler 7 reaches the minimum at the moment, and the specific pressure of the filler 7 and the valve rod 9 is reduced, so that the effect of reducing the abrasion of the filler by the valve rod when the valve rod moves is achieved.
When the valve rod 9 continues to descend, the upper snap ring 17 on the valve rod 9 enters the first inner through groove 16 of the movable gland 3, the movable gland 3 is pushed to move downwards along with the valve rod 9 through the first protruding part, and the packing 7 is squeezed again at the moment; when the valve rod 9 moves to the bottommost end, the packing 7 is in the maximum compression state, and the sealing effect is enhanced.
In the present invention, the upper snap ring 17 and the movable gland 3 constitute an upper loading seal, and the middle snap ring 14 and the movable sleeve 8 constitute a lower loading seal. The upper loading sealing device and the lower loading sealing device are matched with each other under the driving action of the spiral pair, so that when the valve rod moves, the loading device unloads the filler, the filler abrasion of the sealing device is reduced, and the service life of the sealing device is prolonged. The filling material is in a gradually loading state at the two moments of the valve to be fully opened and closed; at the time of full opening and closing of the valve, the filler is in a loading completion state, and a good sealing effect is achieved.
The present invention is not limited to the above-described embodiments, and any obvious improvements, substitutions or modifications can be made by those skilled in the art without departing from the spirit of the present invention.
Claims (10)
1. A valve sealing structure for reducing abrasion is characterized by comprising a rotating wheel (1), a fixed baffle (2), a movable gland (3), a valve cover (4), a spring set (5), a filler (7), a movable sleeve (8), a valve rod (9), a valve body (10) and a valve core (11);
the valve bonnet (4) is fixed on a valve body (10), an axial through channel in the valve bonnet is provided with two stepped end faces, a stuffing box channel is arranged between a first vertical circular stepped end face (A) and a first horizontal annular stepped end face (B), and a movable sleeve (8) is arranged on the first horizontal annular stepped end face (B); a middle clamping ring channel of the valve rod is arranged between the second vertical circular step end surface (C) and the second horizontal annular step end surface (D); an internal thread (13) is tapped on the inner side of the third vertical circular step end face (E);
the rotating wheel (1) is fixedly connected with a valve rod (9), the valve rod (9) is sequentially provided with an upper snap ring (17), a middle snap ring (14) and a lower thread (12) which move synchronously from top to bottom, the valve rod (9) penetrates through an axial through channel of the valve bonnet (4) and then the bottom end of the axial through channel is connected with the valve core (11), the lower thread (12) on the valve rod (9) is an external thread, and the external thread and the internal thread (13) form a screw pair driving the valve rod (9) to move axially;
the fixed baffle (2) is fixedly connected with the valve cover (4) of the valve; the movable gland (3) is coaxially sleeved on the valve rod (9) and consists of an annular body and an embedded part, the embedded part and the stuffing box channel form an axial sliding pair, and the annular body is limited between the fixed baffle (2) and the valve cover (4); the spring group (5) is arranged below the movable gland (3), the stuffing (7) is filled in a stuffing box channel between the spring group (5) and the movable sleeve (8), and two ends of the spring group (5) are respectively supported against the lower surface of the movable gland (3) and the upper surface of the stuffing (7); the movable gland (3), the spring set (5), the packing (7) and the movable sleeve (8) are limited to move in a packing box channel on the outer side of the valve rod (9);
a first protruding part is arranged on the movable gland (3), the first protruding part is positioned on the downward moving path of the upper snap ring (17), and the movable gland (3) is driven to move downwards by pushing the first protruding part in the process that the upper snap ring (17) moves downwards along with the valve rod (9);
the movable sleeve (8) is provided with a second protruding part, the second protruding part is positioned on an upward moving path of the middle snap ring (14), and the movable sleeve (8) is driven to move upwards by pushing the second protruding part in the process that the middle snap ring (14) moves upwards along with the valve rod (9);
when the valve rod (9) moves downwards to the limit position, the valve core (11) completely closes a water flow channel in the valve, the movable sleeve (8) is attached to the first horizontal annular step end face (B), the middle clamping ring (14) is separated from the second protruding portion, and the upper clamping ring (17) enables the spring set (5) and the packing (7) to be in a compressed state by pushing the movable gland (3);
when the valve rod (9) moves upwards to the limit position, the valve core (11) completely opens a water flow channel in the valve, the top of the movable gland (3) is attached to the fixed baffle (2), the upper snap ring (17) is separated from the first protruding portion, and the middle snap ring (14) enables the spring set (5) and the filler (7) to be in a compression state by pushing the movable sleeve (8).
2. A wear-reducing valve seal structure according to claim 1, wherein the movable gland (3) is provided with a first through groove (16) having a diameter larger than the outer diameter of the snap ring (17) on the valve stem, the first protrusion is a first annular body coaxially arranged at the bottom of the first through groove (16), and the inner diameter of the first annular body is smaller than the outer diameter of the snap ring (17) on the valve stem.
3. A wear-reducing valve seal structure according to claim 1, wherein the movable sleeve (8) is provided with a second through groove (15) having a diameter larger than the outer diameter of the snap ring (14) in the valve stem, the second protrusion is a second annular body coaxially arranged on the top of the second through groove (15), and the inner diameter of the second annular body is smaller than the outer diameter of the snap ring (14) in the valve stem.
4. A wear-reducing valve seal according to claim 1, characterised in that the outer diameter of the upper snap ring (17) of the valve stem (9) is equal to the outer diameter of the middle snap ring (14) and is greater than the nominal diameter of the lower thread (12).
5. An abrasion-reducing valve sealing structure according to claim 1, wherein said fixed baffle (2) is a cover body with a through hole, and the cover body is hollow inside and serves as a moving space for the movable gland (3).
6. An abrasion-reducing valve sealing structure according to claim 1, wherein the fixed baffle (2) is fixed on the top of the valve cover (4) through a bolt group (6).
7. A wear-reducing valve seal according to claim 1, characterised in that the spring pack (5) and the packing (7) are under maximum compression when the valve stem (9) is moved up or down to an extreme position.
8. A wear-reducing valve seal structure according to claim 1, characterized in that the valve cover (4) is provided at its lower end with a flange, by means of which it is fixed to the valve body (10).
9. A wear-reducing valve seal according to claim 1, characterised in that the packing (7) fills the stuffing box passage between the spring package (5) and the movable sleeve (8) forming a movable seal.
10. A method of reducing wear of a valve seal using a valve seal structure according to any of claims 1 to 9, comprising the steps of:
when the control valve is opened from a closed position to a turned position, the valve rod (9) is controlled to rise by rotating the rotating wheel (1); the movable gland (3) moves upwards under the action of the spring group (5) to gradually reduce the compression amount of the packing (7), after the valve is opened to a certain degree, the movable gland (3) is limited by the fixed baffle (2) to reach the topmost end, so that the compression amount of the packing (7) is minimized, the specific pressure of the packing (7) and the valve rod (9) is reduced, and the abrasion to the packing (7) in the movement process of the valve rod (9) is reduced; when the valve rod (9) continues to ascend, the middle snap ring (14) on the valve rod (9) enters the second inner through groove (15) of the movable sleeve (8), and the movable sleeve (8) is pushed to move upwards along with the valve rod (9) through the second protruding part, so that the filler (7) is extruded again; when the valve rod (9) moves to the top end, the packing (7) is in the maximum compression state, the specific pressure between the packing (7) and the valve rod (9) is maximum, and the sealing effect is enhanced;
when the control valve is turned from opening to closing, the valve rod (9) is controlled to descend by rotating the rotating wheel (1); the movable sleeve (8) moves downwards under the action of the spring force, so that the compression amount of the spring group (5) is gradually reduced, when the valve is closed to a certain degree, the movable sleeve (8) reaches the bottommost end and is attached to the first horizontal annular step end face (B), the compression amount of the filler (7) is minimized, the specific pressure between the filler (7) and the valve rod (9) is reduced, and the abrasion to the filler (7) when the valve rod (9) moves is reduced; when the valve rod (9) continues to descend, an upper snap ring (17) on the valve rod (9) enters a first inner through groove (16) of the movable gland (3), and the movable gland (3) is pushed to move downwards along with the valve rod (9) through the first protruding part, so that the packing (7) is extruded again; when the valve rod (9) moves to the bottommost end, the packing (7) is in the maximum compression state, and the sealing effect is enhanced.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911423814.5A CN111043323B (en) | 2019-12-31 | 2019-12-31 | Valve sealing structure capable of reducing abrasion and method thereof |
| PCT/CN2020/120726 WO2021135498A1 (en) | 2019-12-31 | 2020-10-14 | Valve sealing structure for reducing abrasion, and method therefor |
| JP2022528355A JP7316010B2 (en) | 2019-12-31 | 2020-10-14 | VALVE SEALING STRUCTURE AND METHOD FOR WEAR REDUCTION |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911423814.5A CN111043323B (en) | 2019-12-31 | 2019-12-31 | Valve sealing structure capable of reducing abrasion and method thereof |
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| CN111043323A true CN111043323A (en) | 2020-04-21 |
| CN111043323B CN111043323B (en) | 2020-10-16 |
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| Country | Link |
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| JP (1) | JP7316010B2 (en) |
| CN (1) | CN111043323B (en) |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112145716A (en) * | 2020-09-04 | 2020-12-29 | 黄爱义 | Valve sealing structure |
| WO2021135498A1 (en) * | 2019-12-31 | 2021-07-08 | 浙江大学 | Valve sealing structure for reducing abrasion, and method therefor |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113700890B (en) * | 2021-08-16 | 2024-04-02 | 凯斯通阀门有限公司 | Ball valve |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN111043323B (en) | 2020-10-16 |
| WO2021135498A1 (en) | 2021-07-08 |
| JP2023504776A (en) | 2023-02-07 |
| JP7316010B2 (en) | 2023-07-27 |
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