CN216923225U - Ultralow-temperature double-eccentric hard sealing structure and butterfly valve with same - Google Patents
Ultralow-temperature double-eccentric hard sealing structure and butterfly valve with same Download PDFInfo
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- CN216923225U CN216923225U CN202122540306.4U CN202122540306U CN216923225U CN 216923225 U CN216923225 U CN 216923225U CN 202122540306 U CN202122540306 U CN 202122540306U CN 216923225 U CN216923225 U CN 216923225U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/30—Hydrogen technology
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Abstract
The utility model discloses an ultra-low temperature double-eccentric hard sealing structure, which relates to the technical field of butterfly valves and comprises the following components: valve body, valve rod, butterfly plate, metal disk seat, disk seat clamping ring. The metal valve seat is arranged between the valve body and the butterfly plate, so that after the metal valve seat is acted by pressure in the valve body, the deformation space of the sealing ring formed by the C-shaped ring, the annular spring and the soft plate is compensated by the opening formed by the structure of the C-shaped ring when the sealing ring is deformed, and the deformation of the metal sealing surface at the sealing position is smooth and can be automatically absorbed and expected. And the metal valve seat is matched with the step carried out by the valve body, so that on one hand, the outer sealing ring is prevented from being damaged due to overlarge stress, and on the other hand, the sealing position is limited, so that the sealing position is reliable, the stress is uniform, and the sealing performance of the butterfly valve under medium and high pressure is ensured. Therefore, the medium-high pressure ultralow temperature double-eccentric hard seal butterfly valve provided by the utility model has the advantages of reliable seal, lower cost and convenience in processing, assembly and maintenance.
Description
Technical Field
The utility model relates to the technical field of butterfly valves, in particular to an ultralow-temperature double-eccentric hard sealing structure.
Background
The localization of LNG storage and transportation equipment is developed, so that LNG cannot leave a key word: and (5) ultralow temperature. The storage and transport temperature of Liquefied Natural Gas (LNG) is-162 ℃; the boiling point of oxygen in air separation is-183 ℃, nitrogen is-196 ℃ and hydrogen is-253 ℃; some cryogenic techniques require lower temperatures and cryogenic media have the particularity of being flammable, explosive, or rare, so their leakage requirements are very high. Therefore, the demand for the ultra-low temperature butterfly valve is continuously increased, and higher requirements are provided for the sealing performance.
Most of the sealing forms of the traditional hard sealing butterfly valves adopt traditional three-eccentric sealing structures, but the three-eccentric butterfly valves have more processing tools, more complex processing technology, relatively higher assembling and overhauling difficulty and higher processing cost. The double-eccentric butterfly valve is simple in machining and assembling process, low in cost and convenient to overhaul on site, so that domestic and foreign enterprises can select the double-eccentric butterfly valve.
However, at present, the pressure of the double-eccentric hard seal butterfly valve at home and abroad has specifications of PN series PN10, PN16, PN25, CLASS 150 and the like, but the double-eccentric hard seal butterfly valve with the pressure of CLASS 300, CLASS 600, PN63 and PN100 is fresh, and therefore, a new seal structure needs to be designed or provided to effectively solve the problem that the butterfly valve in the prior art is not suitable for medium and high pressure.
SUMMERY OF THE UTILITY MODEL
One of the purposes of the utility model is to solve the problem that the ultralow temperature double-eccentric hard seal butterfly valve in the prior art is not suitable for middle and high pressure.
The utility model also aims to provide a butterfly valve with an ultralow-temperature double-eccentric hard sealing structure.
The utility model also aims to provide an ultralow-temperature double-eccentric hard sealing method.
In order to achieve one of the purposes, the utility model adopts the following technical scheme: an ultra-low temperature double eccentric hard seal structure, comprising: valve body, valve rod, butterfly plate, metal disk seat, disk seat clamping ring.
The valve body is internally provided with a cavity, the valve rod and the butterfly plate are arranged in the cavity of the valve body, and the valve rod is connected with the butterfly plate.
The metal valve seat is arranged between the valve body and the butterfly plate, and comprises: c-shaped ring, annular spring, support ring, soft board (soft copper board). The annular spring is arranged on the inner side surface of the C-shaped ring, and the support ring is connected with the valve body or is in close contact with the valve body. The soft state plate (soft state copper plate) takes one end wrapping the head end of the support ring as a starting point, extends and wraps the outer side surfaces of the inner and outer C-shaped rings, and the soft state plate of the outer side surfaces forms a whole.
The C-shaped ring, the annular spring and the soft plate form an inner sealing ring and an outer sealing ring, and the support ring is arranged between the inner sealing ring and the outer sealing ring.
The valve seat pressing ring is arranged in the cavity of the valve body and arranged on one side of the metal valve seat, and pretightening pressure is applied to the metal valve seat through the valve seat pressing ring.
In the technical scheme, when the valve works at low temperature, after the support ring in the metal valve seat is extruded by the pressure in the valve body, the sealing ring formed by the C-shaped ring, the annular spring and the soft plate deforms, meanwhile, the support ring can be close to and go deep into the metal valve seat, and the copper plate wrapped on the support ring is further tightened along with the depth of the support ring;
the deformation space of the C-shaped ring is compensated by an opening formed by the structure of the C-shaped ring, so that the deformation of the metal sealing surface at the sealing position is smooth and can be automatically absorbed, and the sealing performance of the butterfly valve under medium and high pressure is effectively ensured in anticipation;
and the outer sealing ring of the metal valve seat is in step fit with the valve body, the maximum compression amount of the outer sealing ring is controlled by the height of the step, the damage caused by overlarge stress of the outer sealing ring is effectively avoided, the inner sealing ring is positioned at a sealing position which is jointly limited by the valve seat pressing ring, the valve body and the support ring, so that the sealing position is reliable and uniform in stress, and the sealing performance of the butterfly valve under medium and high pressure is ensured.
Further, in the embodiment of the present invention, the soft plate is made of copper, and the metal valve seat includes an annular spring, a C-shaped ring, a support ring, and the soft plate, which are jointly processed by composite processing.
Further, in the embodiment of the present invention, the annular spring is a tight-ring spring, openings of the C-rings are all in a direction of the support ring, the soft state plate between the two C-rings has a protrusion, a head end of the support ring is an extrusion end entering the groove of the valve seat compression ring, the extrusion end has an introduction inclined plane and/or a fillet, the support ring is embedded into the valve seat by extrusion, a pretightening force is applied to the annular spring, the non-extrusion end of the support ring is higher than an end face of the C-ring, and the extrusion end of the support ring is wrapped by the soft state plate. Through the cooperation of the soft board arch and support ring, disk seat clamping ring recess for when under pressure, the three can be close to the gomphosis, prevents that the part in the metal disk seat from taking place the side position and removing under the exogenic action, influences sealing performance.
Furthermore, in the embodiment of the present invention, the groove of the valve seat pressing ring is matched with the convex soft plate on the metal valve seat, and a gap is reserved, where the gap is a space reserved for a large protrusion generated by the metal valve seat being extruded and deformed during sealing.
Further, in an embodiment of the present invention, the annular spring is made of Inconel X750, the C-shaped ring is made of austenitic stainless steel or Inconel X750, the support ring is made of a high-strength alloy, and a linear contraction coefficient of the support ring is greater than or equal to a linear contraction coefficient of the annular spring material. The pre-tightening force provided by the support ring cannot be reduced under the low-temperature condition, and the radial deformation of the annular spring under the high-pressure state can be limited, so that the spring provides larger specific sealing pressure, and the sealing under the high pressure is realized.
Further, in the embodiment of the present invention, the valve rod is connected to the butterfly plate by a sliding pin, the sliding pin is formed by machining a conical pin, a large end portion of the sliding pin is a conical surface, contact portions of the sliding pin and the valve rod are machined smooth planes, and a pin hole of the butterfly plate is a conical hole. The sliding pin can transmit torque, the sealing position of the butterfly valve can be positioned by means of the matching interference of the sliding pin, the valve rod and the butterfly valve can slide slightly at the relative position in a low-temperature state, the non-uniformity of shrinkage of each part at a low temperature is compensated, and the sealing performance of the metal valve seat at the low temperature is ensured.
Further, in the embodiment of the present invention, an adjusting ring is disposed on a side of the valve seat pressing ring, a bolt is fitted on the adjusting ring, and the valve seat pressing ring is fixed and positioned in the cavity of the valve body through a collar.
Further, in the embodiment of the utility model, an overhaul cover plate is arranged at the upper opening of the cavity of the valve body, and the metal valve seat can be overhauled and replaced on line by opening the overhaul cover plate.
The utility model has the beneficial effects that:
according to the utility model, the metal valve seat is arranged between the valve body and the butterfly plate, so that the sealing ring consisting of the C-shaped ring, the annular spring and the soft plate can deform after the metal valve seat is acted by the pressure in the valve body, and the deformation space generated during deformation is compensated by the opening formed by the structure of the C-shaped ring, so that the deformation of the metal sealing surface at the sealing position is smooth and can be absorbed by the user, and the sealing performance of the butterfly valve under medium and high pressure can be effectively ensured in anticipation. And the metal valve seat is matched with the step of the valve body, so that on one hand, the damage caused by overlarge stress of the outer sealing ring is effectively avoided, on the other hand, the sealing position is limited, the sealing position is reliable and uniform, and the sealing performance of the butterfly valve under medium and high pressure is ensured.
The utility model provides a medium-high pressure ultralow temperature double-eccentric hard sealing structure (ultralow temperature double-eccentric hard sealing butterfly valve) which is reliable in sealing, lower in cost and more convenient to process, assemble and maintain.
In order to achieve the second purpose, the utility model adopts the following technical scheme: a butterfly valve, wherein, has the two eccentric hard seal structure of ultra-low temperature in one of the above-mentioned utility model purpose.
Further, in the embodiment of the utility model, a packing cover is connected to the valve body, the packing cover and the valve body are connected through a cylindrical pin, and the upper end of the valve rod penetrates into the packing cover.
Furthermore, in the embodiment of the utility model, a clamping groove is formed in the valve rod, the limiting block is a 90-degree fan-shaped block, and the limiting block is installed in the clamping groove of the valve rod and is matched with the 90-degree fan-shaped block on the packing cover. The valve rod is ensured to rotate within a 90-degree range, so that permanent deformation caused by excessive extrusion of a metal valve seat due to opening and closing of the butterfly plate is prevented, the butterfly plate is ensured to be always in a correct sealing position, the sealing is reliable, the joint of the packing cover and the valve body is provided with the cylindrical pin for positioning, the limiting is ensured to be firm, and relative sliding is avoided.
Furthermore, in the embodiment of the present invention, the sealing of the valve rod is implemented by using an energy storage ring, graphite packing, a packing gasket and an O-ring to perform combined sealing, two O-rings and emergency sealing grooves are respectively disposed on the inner and outer surfaces of the packing pressing sleeve, the inner and outer emergency sealing grooves are communicated through a small circular hole, and the inner and outer emergency sealing grooves are respectively disposed at the middle position of the two O-rings. In emergency, the liquid sealing material can be injected through the threaded hole on the filler cover for emergency sealing treatment.
In order to achieve the third purpose, the utility model adopts the following technical scheme: the utility model provides an ultra-low temperature double eccentric hard seal method, be applied to in one of the above-mentioned utility model purpose ultra-low temperature double eccentric hard seal structure, or in the two of the above-mentioned utility model purposes butterfly valve, wherein, including following step:
when the valve works at low temperature, after a support ring in the metal valve seat is extruded by the pressure in the valve body, a sealing ring formed by the C-shaped ring, the annular spring and the soft plate deforms, meanwhile, the support ring can be close to and extend into the metal valve seat, and a copper plate wrapped on the support ring is further tightened along with the extension of the support ring;
the deformation space of the C-shaped ring is compensated by an opening formed by the structure of the C-shaped ring, so that the deformation of the metal sealing surface at the sealing position is smooth and can be automatically absorbed, and the sealing performance of the butterfly valve under medium and high pressure is effectively guaranteed in a predictable manner;
and the outer sealing ring of the metal valve seat is in step fit with the valve body, the maximum compression amount of the outer sealing ring is controlled by the height of the step, the damage caused by overlarge stress of the outer sealing ring is effectively avoided, the inner sealing ring is positioned at a sealing position which is jointly limited by the valve seat pressing ring, the valve body and the support ring, so that the sealing position is reliable and uniform in stress, and the sealing performance of the butterfly valve under medium and high pressure is ensured.
Further, in the embodiment of the present invention, the annular spring is made of Inconel X750, the C-shaped ring is made of austenitic stainless steel or Inconel X750, and the support ring is made of a high-strength alloy, so that a linear contraction coefficient of the support ring is greater than or equal to a linear contraction coefficient of the annular spring, and thus the pretightening force provided by the support ring is not reduced under a low temperature condition, and the radial deformation of the annular spring in a high pressure state can be limited, so that the spring provides a greater specific sealing pressure, and sealing under a high pressure is achieved.
Further, in the embodiment of the utility model, the valve rod is connected with the butterfly plate through the sliding pin, the large end part of the sliding pin is a conical surface, the contact parts of the sliding pin and the valve rod are machined smooth planes, the pin hole of the butterfly plate is a conical hole, the sliding pin can transmit torque under the action of force, the sealing position of the butterfly valve can be positioned by means of the cooperation of the sliding pin and interference, the relative position of the valve rod and the butterfly valve can slide slightly under the low-temperature state, the non-uniformity of the shrinkage of each part at the low temperature is compensated, and the sealing performance of the metal valve seat at the low temperature is ensured.
Drawings
Fig. 1 is a schematic structural diagram of a butterfly valve with an ultra-low temperature double-eccentric hard seal structure according to an embodiment of the utility model.
FIG. 2 is an enlarged view of the structure of the first portion of the butterfly valve according to the embodiment of the utility model.
Fig. 3 is an enlarged view of the structure of the part iii of fig. 2.
Fig. 4 is a schematic plan view of a slide pin according to an embodiment of the present invention.
FIG. 5 is a schematic top view of a limiting block according to an embodiment of the utility model.
FIG. 6 is an enlarged view of the structure of the second portion of the butterfly valve according to the embodiment of the present invention.
In the attached drawings
1. Packing pressing sleeve 2, graphite packing 3 and packing pad
4. Energy storage ring 5, filler cover 6 and cylindrical pin
7. Limiting block 8, fan-shaped block 9 and valve body
10. Maintenance cover plate 11, valve rod 12 and butterfly plate
13. Sliding pin 14, retainer ring 15, and adjusting ring
16. Bolt 17, valve seat pressing ring 18 and metal valve seat
19. C-shaped ring 20, annular spring 21 and soft board
22. Support ring 23, O-ring 24, threaded hole
25. Emergency sealing groove
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clear and fully described, embodiments of the present invention are further described in detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of some embodiments of the utility model and are not limiting of the utility model, and that all other embodiments obtained by those of ordinary skill in the art without the exercise of inventive faculty are within the scope of the utility model.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "inner", "outer", "top", "bottom", "side", "vertical", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "a," "an," "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
For the purposes of simplicity and explanation, the principles of the embodiments are described by referring mainly to examples. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the embodiments. But it is obvious. To one of ordinary skill in the art, the embodiments may be practiced without limitation to these specific details. In some instances, well-known ultra-low temperature dual-eccentric hard seal methods and structures have not been described in detail to avoid unnecessarily obscuring the embodiments. In addition, all embodiments may be used in combination with each other.
The first embodiment is as follows:
an ultra-low temperature double eccentric hard sealing structure, as shown in figures 1 and 2, comprises: the valve comprises a valve body 9, a valve rod 11, a butterfly plate 12, a metal valve seat 18 and a valve seat pressing ring 17.
As shown in fig. 1, a cavity is formed in the valve body 9, a valve rod 11 and a butterfly plate 12 are arranged in the cavity of the valve body 9, and the valve rod 11 is connected with the butterfly plate 12.
As shown in fig. 2 and 3, the metal valve seat 18 is disposed between the valve body 9 and the butterfly plate 12, and the metal valve seat 18 includes: c-shaped ring 19, annular spring 20, support ring 22, soft plate 21 (soft copper plate). An annular spring 20 is mounted on the inner side of the C-shaped ring 19, and a support ring 22 is connected or in close contact with the valve body 9. The soft state plate 21 (soft state copper plate) takes one end wrapping the head end of the supporting ring 22 as a starting point, extends and wraps the outer side surfaces of the inner and outer C-shaped rings 19, so that the soft state plate 21 on the outer side surface forms a whole.
The C-ring 19, the annular spring 20 and the soft plate 21 form an inner and an outer sealing ring, between which the support ring 22 is arranged.
The valve seat press ring 17 is arranged in the cavity of the valve body 9, the valve seat press ring 17 is arranged on one side of the metal valve seat 18, and pre-tightening pressure is applied to the metal valve seat 18 through the valve seat press ring 17.
In the embodiment, when the valve works at low temperature, after the supporting ring 22 in the metal valve seat 18 is pressed by the pressure in the valve body 9, the sealing ring formed by the C-ring, the annular spring 20 and the soft plate 21 is deformed, and meanwhile, the supporting ring 22 is close to and extends into the metal valve seat 18, and the copper plate wrapped on the supporting ring 22 is further tightened along with the extension of the supporting ring 22.
The deformation space of the C-shaped ring is compensated by the opening formed by the structure of the C-shaped ring, so that the deformation of the metal sealing surface at the sealing position is smooth and can be automatically absorbed, and the sealing performance of the butterfly valve under medium and high pressure is effectively guaranteed in anticipation.
And the outer sealing ring of the metal valve seat 18 is in step fit with the valve body 9, the maximum compression amount of the outer sealing ring is controlled by the height of the step, the damage of the outer sealing ring caused by overlarge stress is effectively avoided, the inner sealing ring is positioned at a sealing position which is jointly limited by the valve seat pressing ring 17, the valve body 9 and the support ring 22, the sealing position is reliable, the stress is uniform, and the sealing performance of the butterfly valve under medium and high pressure is ensured.
As shown in fig. 3, the soft plate 21 is made of copper, and the metal valve seat 18 includes an annular spring 20, a C-shaped ring 19, a support ring 22, and the soft plate 21.
As shown in fig. 3, the ring spring 20 is a tight-coil spring, the openings of the C-shaped rings 19 are all towards the support ring 22, the soft state plate 21 between the two C-shaped rings 19 has a protrusion, the head end of the support ring 22 is an extrusion end entering the groove of the valve seat press ring 17, the extrusion end has a lead-in inclined plane and/or a round angle, the support ring 22 is embedded into the valve seat by extrusion and exerts a pre-tightening force on the ring spring 20, the non-extrusion end of the support ring 22 is higher than the end surface of the C-shaped ring 19, and the extrusion end of the support ring 22 is wrapped by the soft state plate 21. Through the cooperation of the soft board 21 arch and support ring 22, disk seat clamping ring 17 recess for when under pressure, the three can be close to the gomphosis, prevents that the part in the metal valve seat 18 from taking place the side displacement under the exogenic action, influences sealing performance.
As shown in fig. 3, the groove of the valve seat pressing ring 17 is matched with the convex soft plate 21 on the metal valve seat 18, and a gap is reserved, wherein the gap is a space reserved for generating a large protrusion by the extrusion deformation of the metal valve seat 18 during sealing.
The annular spring 20 is made of Inconel X750, the C-shaped ring 19 is made of austenitic stainless steel or Inconel X750, the support ring 22 is made of high-strength alloy, and the linear contraction coefficient of the support ring 22 is larger than or equal to that of the annular spring 20. The pre-tightening force provided by the support ring 22 is not reduced under low temperature conditions, and the radial deformation of the annular spring 20 under high pressure can be limited, so that the spring provides larger specific sealing pressure, and sealing under high pressure is realized.
As shown in fig. 1 and 4, the valve stem 11 and the butterfly plate 12 are connected by a slide pin 13, the slide pin 13 is formed by machining a conical pin, the large end part is a conical surface, the contact part of the slide pin 13 and the valve stem 11 is a machined smooth plane, and the pin hole of the butterfly plate 12 is a conical hole. The sliding pin 13 can transmit torque, the sealing position of the butterfly valve can be positioned by means of the interference fit of the sliding pin 13, the relative position of the valve rod 11 and the butterfly valve can slide slightly in a low-temperature state, the non-uniformity of shrinkage of each part at low temperature is compensated, and the sealing performance of the metal valve seat 18 at low temperature is ensured.
As shown in fig. 2, an adjusting ring 15 is provided on the valve seat pressing ring 17 side, a bolt 16 is fitted to the adjusting ring 15, and the valve seat pressing ring 17 is fixed and positioned in the cavity of the valve body 9 by a collar 14.
As shown in figure 1, an access cover plate 10 is arranged at the upper opening of the cavity of the valve body 9, and the metal valve seat 18 can be repaired and replaced on line by opening the access cover plate 10.
Example two:
a butterfly valve, wherein, as shown in figure 1, has the ultralow temperature double eccentric hard seal structure in the first embodiment.
Be connected with packing lid 5 on the valve body 9, be connected through cylindric lock 6 between packing lid 5 and the valve body 9, the valve rod 11 upper end penetrates to packing lid 5.
As shown in figures 1 and 5, a clamping groove is formed in the valve rod 11, the limiting block 7 is a 90-degree fan-shaped block 8, and the limiting block 7 is installed in the clamping groove of the valve rod 11 and is matched with the 90-degree fan-shaped block 8 on the packing cover 5. The valve rod 11 is ensured to rotate within the range of 90 degrees, so that the metal valve seat 18 is prevented from being excessively extruded to generate permanent deformation due to the opening and closing of the butterfly plate 12, the butterfly plate 12 is ensured to be always in a correct sealing position, the sealing is reliable, the cylindrical pin 6 is designed at the connecting part of the packing cover 5 and the valve body 9 for positioning, and the positioning is ensured to be firm and not to relatively slide.
As shown in fig. 1 and 6, the valve rod 11 is sealed by combining an energy storage ring 4, a graphite packing 2, a packing pad 3 and an O-ring 23, the inner surface and the outer surface of a packing pressing sleeve 1 are respectively provided with two O-rings 23 and emergency seal grooves 25, the inner emergency seal groove 25 and the outer emergency seal groove 25 are communicated through a small circular hole, and the inner emergency seal groove 25 and the outer emergency seal groove 25 are respectively arranged in the middle positions of the two O-rings 23. In case of emergency, the liquid sealing material can be injected through the screw hole 24 of the packing cover 5 for emergency sealing treatment.
Example three:
an ultra-low temperature double-eccentric hard sealing method is applied to an ultra-low temperature double-eccentric hard sealing structure in the first embodiment or a butterfly valve in the second embodiment, and comprises the following steps:
during low-temperature operation, when the support ring 22 in the metal valve seat 18 is pressed by the pressure in the valve body 9, the seal ring formed by the C-ring, the annular spring 20 and the soft plate 21 deforms, and meanwhile, the support ring 22 extends into the metal valve seat 18, and the copper plate wrapped on the support ring 22 is further tightened along with the extension of the support ring 22.
The deformation space of the C-shaped ring is compensated by the opening formed by the structure of the C-shaped ring, so that the deformation of the metal sealing surface at the sealing position is smooth and can be automatically absorbed, and the sealing performance of the butterfly valve under medium and high pressure is effectively guaranteed in anticipation.
And the outer sealing ring of the metal valve seat 18 is in step fit with the valve body 9, the maximum compression amount of the outer sealing ring is controlled by the height of the step, the damage of the outer sealing ring caused by overlarge stress is effectively avoided, the inner sealing ring is positioned at a sealing position which is jointly limited by the valve seat pressing ring 17, the valve body 9 and the support ring 22, the sealing position is reliable, the stress is uniform, and the sealing performance of the butterfly valve under medium and high pressure is ensured.
The material of the annular spring 20 is Inconel X750, the material of the C-shaped ring 19 is austenitic stainless steel or Inconel X750, the support ring 22 is made of high-strength alloy, so that the linear contraction coefficient of the support ring 22 is larger than or equal to that of the material of the annular spring 20, the pretightening force provided by the support ring 22 cannot be reduced under the low-temperature condition, the radial deformation of the annular spring 20 under the high-pressure state can be limited, the spring provides larger specific sealing pressure, and the sealing under the high-pressure condition is realized.
The valve rod 11 is connected with the butterfly plate 12 through the sliding pin 13, the large end part of the sliding pin 13 is a conical surface, the contact parts of the sliding pin 13 and the valve rod 11 are machined smooth planes, the pin hole of the butterfly plate 12 is a conical hole, under the action of force, the sliding pin 13 can transmit torque, and the sealing position of the butterfly valve can be positioned by means of the matching interference of the sliding pin 13, the relative position of the valve rod 11 and the butterfly valve can slide slightly under the low-temperature state, the non-uniformity of the shrinkage of each part at the low temperature is compensated, and the sealing performance of the metal valve seat 18 at the low temperature is ensured.
Although the illustrative embodiments of the present invention have been described above to enable those skilled in the art to understand the present invention, the present invention is not limited to the scope of the embodiments, and it is apparent to those skilled in the art that all the utility models utilizing the inventive concept can be protected as long as they are within the spirit and scope of the present invention as defined and defined by the appended claims.
Claims (12)
1. An ultra-low temperature double-eccentric hard seal structure, comprising:
the valve body, set up in the valve body:
a cavity;
a valve stem disposed in a cavity of the valve body;
the butterfly plate is arranged in the cavity of the valve body, and the valve rod is connected with the butterfly plate;
the metal valve seat is arranged between the valve body and the butterfly plate, and comprises:
a C-shaped ring;
the annular spring is arranged on the inner side surface of the C-shaped ring;
the support ring is connected with or closely contacted with the valve body;
the soft state plate takes one end wrapping the head end of the support ring as a starting point, extends and wraps the outer side surfaces of the inner and outer C-shaped rings, so that the soft state plates of the outer side surfaces form a whole;
the C-shaped ring, the annular spring and the soft plate form an inner sealing ring and an outer sealing ring, and the support ring is arranged between the inner sealing ring and the outer sealing ring;
the valve seat pressing ring is arranged in the cavity of the valve body, the valve seat pressing ring is arranged on one side of the metal valve seat, and pretightening pressure is applied to the metal valve seat through the valve seat pressing ring.
2. The ultra-low temperature double eccentric hard sealing structure of claim 1, wherein the soft state plate is made of copper, and the metal valve seat comprises an annular spring, a C-shaped ring, a support ring and the soft state plate which are jointly processed in a compounding manner.
3. The ultra-low temperature double-eccentric hard sealing structure according to claim 1, wherein the annular spring is a tight-ring spring, the openings of the C-shaped rings are all towards the direction of the support ring, the soft state plate between the two C-shaped rings has a protrusion, the head end of the support ring is an extrusion end entering the groove of the valve seat press ring, the extrusion end has an introduction inclined plane and/or a fillet, the support ring is embedded into the valve seat through extrusion, the pretightening force is applied to the annular spring, the non-extrusion end of the support ring is higher than the end surface of the C-shaped ring, and the extrusion end of the support ring is wrapped by the soft state plate.
4. The ultra-low temperature double-eccentric hard sealing structure according to claim 3, wherein a groove of the valve seat press ring is matched with the convex soft state plate on the metal valve seat and a gap is reserved, and the gap is a space reserved for a larger convex generated by the metal valve seat being extruded and deformed during sealing.
5. The ultra-low temperature dual-eccentric hard seal structure of claim 3 wherein the ring spring material is Inconel X750, the C-ring material is austenitic stainless steel or Inconel X750, the support ring is a high strength alloy, and the support ring linear contraction coefficient is equal to or greater than the ring spring material linear contraction coefficient.
6. The ultra-low temperature double eccentric hard sealing structure according to claim 1, wherein the valve rod is connected with the butterfly plate by a sliding pin, the sliding pin is formed by processing a conical pin, the large end part of the sliding pin is a conical surface, the contact part of the sliding pin and the valve rod is a machined smooth plane, and the butterfly plate pin hole is a conical hole.
7. The ultra-low temperature double-eccentric hard sealing structure according to claim 1, wherein an adjusting ring is arranged on the side of the valve seat pressing ring, a bolt is matched on the adjusting ring, and the valve seat pressing ring is fixedly positioned in the cavity of the valve body through a clamping ring.
8. The ultra-low temperature double eccentric hard sealing structure of claim 1, wherein an access cover plate is arranged at the upper opening of the valve body cavity, and the metal valve seat can be maintained and replaced on line by opening the access cover plate.
9. A butterfly valve having the ultra-low temperature double eccentric hard seal structure of any of claims 1-8.
10. The butterfly valve of claim 9, wherein a packing cap is attached to the valve body, the packing cap is attached to the valve body by a cylindrical pin, and the upper end of the valve stem penetrates into the packing cap.
11. The butterfly valve of claim 10, wherein the valve stem defines a slot, and a stop block is mounted in the slot, the stop block being a 90 ° segment that cooperates with the 90 ° segment of the packing cover.
12. The butterfly valve according to claim 10, wherein the valve stem is sealed by an energy storage ring, a graphite packing, a packing gasket and an O-ring, the inner surface and the outer surface of the packing gasket are respectively provided with two O-rings and an emergency sealing groove, the inner emergency sealing groove and the outer emergency sealing groove are communicated through a small circular hole, and the inner emergency sealing groove and the outer emergency sealing groove are respectively arranged in the middle of the two O-rings.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113819251A (en) * | 2021-10-21 | 2021-12-21 | 张家港富瑞阀门有限公司 | A kind of ultra-low temperature double eccentric hard sealing structure and butterfly valve with the structure and method |
| CN115750813A (en) * | 2022-10-31 | 2023-03-07 | 上海沪东造船阀门有限公司 | Self-compensating positive feedback ultra-low temperature butterfly valve sealing structure |
-
2021
- 2021-10-21 CN CN202122540306.4U patent/CN216923225U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113819251A (en) * | 2021-10-21 | 2021-12-21 | 张家港富瑞阀门有限公司 | A kind of ultra-low temperature double eccentric hard sealing structure and butterfly valve with the structure and method |
| CN115750813A (en) * | 2022-10-31 | 2023-03-07 | 上海沪东造船阀门有限公司 | Self-compensating positive feedback ultra-low temperature butterfly valve sealing structure |
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