CN112833235A - Pressure self-tightening sealing structure of swing check valve - Google Patents

Pressure self-tightening sealing structure of swing check valve Download PDF

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Publication number
CN112833235A
CN112833235A CN202110301179.4A CN202110301179A CN112833235A CN 112833235 A CN112833235 A CN 112833235A CN 202110301179 A CN202110301179 A CN 202110301179A CN 112833235 A CN112833235 A CN 112833235A
Authority
CN
China
Prior art keywords
ring
valve
valve cover
sealing
cover
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202110301179.4A
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Chinese (zh)
Inventor
洪进元
孟磊磊
马巨庭
洪振坤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanghai Eho Valve Co ltd
Original Assignee
Shanghai Eho Valve Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shanghai Eho Valve Co ltd filed Critical Shanghai Eho Valve Co ltd
Priority to CN202110301179.4A priority Critical patent/CN112833235A/en
Publication of CN112833235A publication Critical patent/CN112833235A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • F16K27/08—Guiding yokes for spindles; Means for closing housings; Dust caps, e.g. for tyre valves
    • 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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
    • F16J15/061—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with positioning means
    • 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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
    • F16J15/062—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces characterised by the geometry of the seat
    • 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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
    • F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
    • F16J15/102—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing characterised by material
    • 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
    • F16K27/0209—Check valves or pivoted valves

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Check Valves (AREA)

Abstract

The invention discloses a pressure self-tightening sealing structure of a swing check valve, which comprises a valve cover for sealing the top of a valve body, wherein a wedge-shaped sealing groove is formed between the edge of the upper part of the valve cover and the inner wall of the valve body, a matched sealing ring is arranged in the wedge-shaped sealing groove, a pressing ring is arranged above the sealing ring, a four-open ring is arranged above the pressing ring, an installation groove matched with the four-open ring is arranged on the inner wall of the valve body, the four-open ring is embedded in the installation groove from the side surface, a cover plate is arranged above the four-open ring, a stud is arranged in the cover plate and penetrates through the cover plate. According to the invention, the wedge-shaped sealing groove is formed between the valve cover and the valve body, and the valve cover is sealed by arranging the matched wedge-shaped sealing ring, when the pressure is increased, the valve cover is pushed to move upwards, the valve cover extrudes the sealing ring, the sealing ring is in contact with the valve cover and the valve body more tightly due to the inclined surface contact of the valve cover and the sealing ring, and the sealing performance is better as the pressure is higher.

Description

Pressure self-tightening sealing structure of swing check valve
Technical Field
The invention relates to a valve body sealing structure, in particular to a pressure self-tightening sealing structure of a swing check valve.
Background
The swing check valve generally adopts a middle flange sealing structure, a middle flange flat gasket is adopted as a sealing element in the structure, and the sealing performance is good under the working condition of middle and low pressure. However, under the high-pressure working condition, in order to ensure the sealing of the middle flange, the gasket of the middle flange needs to be widened, so that the middle flange of the valve is enlarged, the whole size of the valve is enlarged, and the whole weight is heavy. For the valve with the nominal pressure exceeding 2500Lb, the sealing structure of the middle flange is adopted, and even if the width of the gasket is increased, the sealing at the middle flange is difficult to ensure. Therefore, it is necessary to design a sealing structure suitable for a swing check valve with high pressure (nominal pressure > 10 MPa).
Disclosure of Invention
The invention aims to provide a pressure self-tightening sealing structure of a swing check valve, which is suitable for the swing check valve under high-pressure working conditions.
The invention provides a pressure self-tightening sealing structure of a swing check valve, which is used for solving the technical problems and comprises a valve cover for sealing the top of a valve body, wherein a wedge-shaped sealing groove is formed between the edge of the upper part of the valve cover and the inner wall of the valve body, a matched sealing ring is arranged in the wedge-shaped sealing groove, a pressing ring is arranged above the sealing ring, the upper surface of the pressing ring is flush with the upper surface of the valve cover, a four-open ring is arranged above the pressing ring, an installation groove matched with the four-open ring is formed in the inner wall of the valve body, the four-open ring is embedded in the installation groove from the side surface, a cover plate is arranged above the four-open ring, a stud is arranged in the cover plate.
Further, the valve gap is wholly a cylinder, valve gap bottom diameter is greater than the top diameter, the middle part of valve gap connection bottom and top is the round platform shape, valve gap bottom diameter matches with valve body top internal diameter, when the valve gap sets up in the valve body, form wedge seal groove between valve gap upper portion and the valve body inner wall.
Further, the sealing ring is annular, the outer diameter of the sealing ring is matched with the diameter of the bottom of the valve cover, the inner diameter of the sealing ring is matched with the diameter of the top of the valve cover, and the inner wall of the lower portion of the sealing ring is in a circular truncated cone shape matched with the middle of the valve cover.
Further, the clamping ring is annular, the outer diameter of the clamping ring is matched with the outer diameter of the bottom of the valve cover, and the inner diameter of the clamping ring is matched with the outer diameter of the top of the valve cover.
Further, the four-open ring is the arc piece that is divided into four postprocessing by a whole ring and forms, the external diameter of four-open ring is greater than valve gap bottom external diameter, the internal diameter of four-open ring slightly is greater than the top external diameter of valve gap and is less than the bottom external diameter of valve gap.
Further, the height of mounting groove and the high matching of four ring-opening, the internal diameter of mounting groove and the external diameter of four ring-opening match, four ring-opening are two and relative setting in the mounting groove, and will sealing washer and clamping ring location.
Furthermore, the bottom surface of the cover plate is provided with a positioning groove matched with the four open rings.
Further, the valve gap top surface is provided with the internal thread hole that matches with the double-screw bolt, be provided with the stud hole that link up on the apron, the stud hole corresponds the setting with the internal thread hole of valve gap, the double-screw bolt passes the stud hole passes through internal thread jogged joint with the valve gap.
Furthermore, a through dismounting hole is formed in the side wall of the valve cover corresponding to the mounting groove.
Further, the sealing ring is made of flexible graphite and stainless steel wires.
Compared with the prior art, the invention has the following beneficial effects: according to the pressure self-tightening sealing structure of the swing check valve, the wedge-shaped sealing groove is formed between the valve cover and the valve body, the valve cover and the valve body are sealed through the matched wedge-shaped sealing ring, when the pressure is increased, the valve cover is pushed to move upwards, the valve cover extrudes the sealing ring, the sealing ring is in contact with the valve cover and the valve body more closely under the pressure because the valve cover is in inclined surface contact with the sealing ring, and the sealing performance is better when the pressure is higher; the upper part of the sealing ring is positioned in an embedded mode through the compression ring and the side face of the four-open ring, the top of the four-open ring is locked to the valve cover through the cover plate and the stud, the structure is compact, the size is small, the weight is light, materials are saved, the cost is low, and the four-open ring is very suitable for limited installation space of a thermal power generating unit and a nuclear power generating unit.
Drawings
FIG. 1 is a schematic view of a pressure self-tightening seal structure of a swing check valve installed in a valve body according to an embodiment of the present invention;
FIG. 2 is an exploded view of a pressure self-tightening sealing structure of a swing check valve in an embodiment of the present invention;
fig. 3 is a schematic structural view of a swing check valve employing a pressure self-tightening sealing structure according to an embodiment of the present invention.
In the figure:
1. a valve body; 7. a stud; 8. a cover plate; 9. a valve cover; 10. opening a ring; 11. a pressure ring 12 and a sealing ring; 101. and (6) disassembling the hole.
Detailed Description
The invention is further described below with reference to the figures and examples.
Fig. 1 is a schematic view illustrating the installation of a pressure self-tightening type sealing structure of a swing check valve in a valve body according to an embodiment of the present invention.
Referring to fig. 1, the pressure self-tightening sealing structure of the swing check valve according to the embodiment of the present invention includes a valve cover 9 for sealing the top of a valve body 1, a wedge-shaped sealing groove is formed between an upper edge of the valve cover 9 and an inner wall of the valve body 1, a matching sealing ring 12 is disposed in the wedge-shaped sealing groove, a pressing ring 11 is disposed above the sealing ring 12, an upper surface of the pressing ring 11 is flush with an upper surface of the valve cover 9, a four-open ring 10 is disposed above the pressing ring 11, an installation groove matching the four-open ring 10 is disposed on the inner wall of the valve body 1, the four-open ring 10 is embedded in the installation groove from a side surface, a cover plate 8 is disposed above the four-open ring 10, a stud 7 is disposed in the cover plate 8.
Referring to fig. 2, in the pressure self-tightening sealing structure of the swing check valve according to the embodiment of the present invention, the valve cover 9 is a cylinder as a whole, the diameter of the bottom of the valve cover 9 is larger than that of the top of the valve cover, the middle portion of the valve cover 9 connecting the bottom and the top is in a circular truncated cone shape, the diameter of the bottom of the valve cover 9 is matched with the inner diameter of the top of the valve body 1, and when the valve cover 9 is disposed in the valve body 1, a wedge-shaped sealing groove is formed between the upper portion of the valve.
Specifically, the sealing ring 12 is annular, the outer diameter of the sealing ring 12 is matched with the diameter of the bottom of the valve cover 9, the inner diameter of the sealing ring 12 is matched with the diameter of the top of the valve cover 9, and the inner wall of the lower portion of the sealing ring 12 is in a circular truncated cone shape matched with the middle of the valve cover 9. The seal ring 12 is made of flexible graphite and stainless steel wire. The valve cover 9 is matched with the wedge-shaped sealing ring 12 in angle, when the pressure is increased, the valve cover 9 is pushed to move upwards, the valve cover 9 extrudes the sealing ring 12, and the valve cover 9 is in inclined surface contact with the sealing ring 12, so that the sealing ring 12 is in closer contact with the valve cover 9 and the valve body 1 under the pressure, and the sealing performance is better as the pressure is higher.
Specifically, the pressing ring 11 is annular, the outer diameter of the pressing ring 11 is matched with the outer diameter of the bottom of the valve cover 9, and the inner diameter of the pressing ring 11 is matched with the outer diameter of the top of the valve cover 9; the four-open ring 10 is an arc-shaped block which is formed by four parts of post processing through a whole ring, the outer diameter of the four-open ring 10 is larger than the outer diameter of the bottom of the valve cover 9, and the inner diameter of the four-open ring 10 is slightly larger than the outer diameter of the top of the valve cover 9 and smaller than the outer diameter of the bottom of the valve cover 9. The height of mounting groove and the high matching of ring 10 open, the internal diameter of mounting groove matches with ring 10 open's external diameter, ring 10 open is two and sets up in the mounting groove relatively, and will sealing washer 12 and clamping ring 11 location. The four-open ring 10 and the compression ring 11 can be locked by correspondingly arranged mounting hole screws. The bottom surface of the compression ring 11 is completely attached to the sealing ring 12, the side surfaces of the four-open ring 10 are embedded and positioned, the top of the four-open ring 10 is locked to the valve cover 9 through the cover plate 8 and the stud 7, the structure is compact, and locking is firm.
Preferably, the side wall of the bonnet 9 is provided with a through-going removal hole 101 in correspondence of the mounting slot. When the valve needs to be disassembled for maintenance or the sealing ring 12 is replaced, the four-open ring 10 can be easily disassembled through the disassembling hole 101, and the problem that the four-open ring 10 is difficult to disassemble due to occlusion with the valve body 1 under the action of medium pressure is avoided.
Preferably, the bottom surface of the cover plate 8 is provided with a positioning groove matched with the four-open ring 10, so that the four-open ring 10 is positioned and the displacement of the four-open ring 10 is avoided.
Specifically, the top surface of the valve cover 9 is provided with an internal thread hole matched with the stud 7, a through stud hole is formed in the cover plate 8, the stud hole corresponds to the internal thread hole of the valve cover 9, and the stud 7 penetrates through the internal thread hole and the valve cover 9.
Referring to fig. 3, in the pressure self-tightening sealing structure of the swing check valve according to the embodiment of the present invention, a wedge-shaped sealing groove is reserved between the valve cover 9 and the valve body 1, and the sealing groove is sealed by arranging a matched wedge-shaped sealing ring 12, when the pressure is increased, the valve cover 9 is pushed to move upwards, the valve cover 9 extrudes the sealing ring 12, and since the valve cover 9 and the sealing ring 12 are in inclined surface contact, the pressure makes the sealing ring 12 in closer contact with the valve cover 9 and the valve body 1, and the higher the pressure is, the better the sealing performance is.
In summary, in the pressure self-tightening sealing structure of the swing check valve according to the embodiment of the present invention, a wedge-shaped sealing groove is formed between the valve cover 9 and the valve body 1, and the wedge-shaped sealing ring 12 is arranged for sealing, when the pressure is increased, the valve cover 9 is pushed to move upwards, the valve cover 9 extrudes the sealing ring 12, and as the valve cover 9 and the sealing ring 12 are in inclined surface contact, the pressure makes the sealing ring 12 and the valve cover 9 and the valve body 1 more closely contact, and the higher the pressure is, the better the sealing performance is; the upper part of the sealing ring 12 is positioned in an embedded mode through the side face of the pressing ring 11 and the four-open ring 10, the top of the four-open ring 10 is locked to the valve cover 9 through the cover plate 8 and the stud 7, the structure is compact, the size is small, the weight is light, materials are saved, the cost is low, and the four-open ring is very suitable for limited installation space of thermal power units and nuclear power units.
Although the present invention has been described with respect to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. The utility model provides a pressure self-clinching formula seal structure of swing check valve, a serial communication port, include the valve gap with valve body top confined, be formed with the wedge seal groove between valve gap upper portion edge and the valve body inner wall, be provided with the sealing washer of matching in the wedge seal groove, the top of sealing washer is provided with the clamping ring, clamping ring upper surface and valve gap upper surface parallel and level, the top of clamping ring is provided with the ring of four-opening, the valve body inner wall is provided with the mounting groove that matches with the ring of four-opening, the ring of four-opening edgewise inlays to be established in the mounting groove, the top of ring of four-opening is provided with the apron, be provided with the double-screw bolt in.
2. The pressure self-tightening type sealing structure of the swing check valve according to claim 1, wherein the valve cover is a cylinder as a whole, the diameter of the bottom of the valve cover is larger than that of the top of the valve cover, the middle part of the valve cover connecting the bottom and the top is a circular truncated cone, the diameter of the bottom of the valve cover is matched with the inner diameter of the top of the valve body, and when the valve cover is arranged in the valve body, a wedge-shaped sealing groove is formed between the upper part of the valve cover and the inner wall of the valve body.
3. The pressure self-tightening type sealing structure of the swing check valve according to claim 2, wherein the sealing ring has a ring shape, an outer diameter of the sealing ring is matched with a diameter of the bottom of the valve cover, an inner diameter of the sealing ring is matched with a diameter of the top of the valve cover, and an inner wall of the lower portion of the sealing ring has a circular truncated cone shape matched with the middle of the valve cover.
4. The pressure self-tightening type seal structure of the swing check valve according to claim 2, wherein the pressing ring has a ring shape, an outer diameter of the pressing ring is matched with an outer diameter of a bottom of the valve cover, and an inner diameter of the pressing ring is matched with an outer diameter of a top of the valve cover.
5. The pressure self-tightening type sealing structure of the swing check valve according to claim 2, wherein the four open rings are arc-shaped blocks which are formed by dividing a whole ring into four parts and then processing the four open rings, the outer diameter of the four open rings is larger than the outer diameter of the bottom of the valve cover, and the inner diameter of the four open rings is slightly larger than the outer diameter of the top of the valve cover and smaller than the outer diameter of the bottom of the valve cover.
6. The pressure self-tightening type sealing structure of the swing check valve according to claim 5, wherein the height of the mounting groove is matched with the height of a four-open ring, the inner diameter of the mounting groove is matched with the outer diameter of the four-open ring, the four-open ring is provided in two and oppositely in the mounting groove, and the sealing ring and the pressing ring are positioned.
7. The pressure self-tightening type sealing structure of a swing check valve according to claim 1, wherein the bottom surface of the cap plate is provided with a positioning groove matching with the four open rings.
8. The pressure self-tightening type sealing structure of the swing check valve according to claim 1, wherein the top surface of the valve cover is provided with an internal threaded hole matched with a stud, the cover plate is provided with a through stud hole, the stud hole is arranged corresponding to the internal threaded hole of the valve cover, and the stud passes through the stud hole and is connected with the valve cover through the internal threaded hole.
9. The pressure self-tightening structure of a swing check valve according to claim 1, wherein the side wall of the cap is provided with a through-hole at a position corresponding to the mounting groove.
10. The pressure self-tightening sealing structure of a swing check valve according to claim 1, wherein the sealing ring is made of flexible graphite and stainless steel wire.
CN202110301179.4A 2021-03-22 2021-03-22 Pressure self-tightening sealing structure of swing check valve Pending CN112833235A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110301179.4A CN112833235A (en) 2021-03-22 2021-03-22 Pressure self-tightening sealing structure of swing check valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110301179.4A CN112833235A (en) 2021-03-22 2021-03-22 Pressure self-tightening sealing structure of swing check valve

Publications (1)

Publication Number Publication Date
CN112833235A true CN112833235A (en) 2021-05-25

Family

ID=75930449

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110301179.4A Pending CN112833235A (en) 2021-03-22 2021-03-22 Pressure self-tightening sealing structure of swing check valve

Country Status (1)

Country Link
CN (1) CN112833235A (en)

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