CN213117710U

CN213117710U - Valve rod sealing structure and gate valve

Info

Publication number: CN213117710U
Application number: CN202022096051.2U
Authority: CN
Inventors: 康鸿; 邢甜甜; 季晨曦
Original assignee: Neway Valve Suzhou Co Ltd
Current assignee: Neway Valve Suzhou Co Ltd
Priority date: 2020-09-22
Filing date: 2020-09-22
Publication date: 2021-05-04
Anticipated expiration: 2030-09-22

Abstract

The utility model provides a valve rod seal structure and gate valve, it includes valve gap, valve rod, packing assembly, general stopper circle and support. The packing component and the universal stopper ring are distributed on two sides of the step surface of the first step, and the bottom of the packing component is directly or indirectly abutted against the step surface of the first step. The inner diameter of the packing assembly is the same as that of the flooding plug ring, the outer diameter of the packing assembly is larger than that of the flooding plug ring, the packing assembly needs to be pressed and sealed by large pretightening force, the bottom of the packing assembly is directly or indirectly abutted against the step surface of the first step, the downward pretightening force is transmitted to the first step and is blocked by the first step, so that the downward pretightening force is greatly reduced, and the flooding plug ring is prevented from being crushed; simultaneously because the separation of first step, the pretightning force of packing subassembly can be applyed as required, can fully compress tightly the packing subassembly and make its inside and outside butt respectively on valve rod and valve gap, guarantees sealed effect.

Description

Valve rod sealing structure and gate valve

Technical Field

The utility model relates to a valve equipment technical field, concretely relates to valve rod seal structure and gate valve.

Background

The existing valve rod sealing structure comprises a plurality of seals, a flooding plug ring and a packing set are sequentially arranged from the middle cavity of a valve body upwards, the packing set and the flooding plug ring are continuously arranged in the axial direction of a valve rod, the upper part of the packing set is compressed through a pressing sleeve or a support, and when the pressing force is small, the packing cannot be sufficiently compressed and sealed, so that the packing seal fails; when the pressing force is large, the pressing force is transmitted to the plunger ring, the plunger ring is easily crushed, the sealing failure of the plunger ring is caused, and finally the sealing effect of the valve rod is poor.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model lies in overcoming the poor defect of the sealed effect of valve rod sealing valve rod department among the prior art.

Therefore, the utility model provides a valve rod sealing structure, include

The inner wall of the valve cover is provided with an annular groove; the annular groove has a first step;

the valve rod is arranged in the valve cover in a penetrating mode; the annular groove and the outer wall surface of the valve rod form a packing groove in a surrounding manner;

the packing assembly is arranged in the packing groove and is positioned on one side, away from the middle cavity of the valve body, of the first step;

the flooding plug ring is sleeved on the valve rod and positioned in the packing groove, and the flooding plug ring is positioned on one side of the first step, which is close to the middle cavity of the valve body;

the bracket is arranged on the top surface of the valve cover and applies pretightening force towards the middle cavity of the valve body to the packing assembly.

Optionally, in the above valve stem sealing structure, the packing assembly includes a V-shaped packing, and the V-shaped packing is disposed on a side of the first step away from the valve body middle cavity.

Optionally, in the above valve stem sealing structure, the annular groove further has a second step, and the second step is arranged away from the valve body middle cavity relative to the first step; the packing assembly further comprises graphite packing, and the graphite packing is arranged on one side, far away from the middle cavity of the valve body, of the second step.

Optionally, in the valve stem sealing structure described above, the packing assembly further includes a packing backing ring disposed at the bottom of the graphite packing, and the bottom of the packing backing ring abuts against the step surface of the second step; the top of the V-shaped packing abuts against the bottom of the packing backing ring.

Optionally, the valve rod sealing structure further comprises a spacer ring arranged between the flooding plug ring and the V-shaped packing; the bottom of the spacer ring is abutted against the step surface of the first step; the bottom of the V-shaped packing abuts against the top of the spacer ring.

Optionally, in the above valve rod sealing structure, a first through hole is formed in the middle of the spacer ring in the thickness direction; and a second through hole communicated with the first through hole is formed in the valve cover.

The utility model provides a gate valve, valve rod seal structure including any one of the above-mentioned.

Optionally, the gate valve further comprises a valve body, wherein an annular step is arranged on the periphery of the outer side of the bottom of the valve cover, and the annular step is clamped at the top of the valve body; the annular step comprises a horizontal surface and a vertical surface, and a radial sealing part is arranged between the vertical surface and the valve body; an axial sealing component is arranged between the horizontal plane and the valve body.

Optionally, in the gate valve, a first protruding portion protruding toward the valve body is arranged on the horizontal plane, a first groove into which the first protruding portion extends is arranged on the valve body, and the axial sealing component is arranged in the first groove.

Optionally, in the gate valve, the top and the bottom of the support are respectively provided with a drain hole communicated with the inner cavity of the support.

The utility model discloses technical scheme has following advantage:

1. the utility model provides a valve rod sealing structure, packing assembly and general stopper circle distribute in the step face both sides of first step, and the direct or indirect butt in packing assembly bottom is on the step face of first step. The inner diameter of the packing assembly is the same as that of the flooding plug ring, the outer diameter of the packing assembly is larger than that of the flooding plug ring, the packing assembly needs to be pressed and sealed by large pretightening force, the bottom of the packing assembly is directly or indirectly abutted against the step surface of the first step, the downward pretightening force is transmitted to the first step and is blocked by the first step, so that the downward pretightening force is greatly reduced, and the flooding plug ring is prevented from being crushed; simultaneously because the separation of first step, the pretightning force of packing subassembly can be applyed as required, can fully compress tightly the packing subassembly and make its inside and outside butt respectively on valve rod and valve gap, guarantees sealed effect.

2. The utility model provides a gate valve, valve rod seal structure and valve body, the valve rod department packing assembly of gate valve and general stopper circle distribute in the step face both sides of first step, and the packing assembly bottom is directly or indirectly supported and connect on the step face of first step, and downward pretightning force is transmitted to first step department and is blockked, can avoid crushing general stopper circle; because the separation of first step, the pretightning force of packing assembly can be applyed as required, can fully compress tightly packing assembly and make its inside and outside butt respectively on valve rod and valve gap, guarantees sealed effect.

3. The utility model provides a gate valve sets up radially and axially twice sealedly with the valve gap junction at the valve body, when the not hard up pretightning force that makes the valve gap apply to the gasket of partial nut reduces and leads to the axial seal to become invalid, and radial O type circle still can play sealed effect, prevents that the valve from leaking.

4. The utility model provides a gate valve, the horizontal plane of valve gap annular step is equipped with towards the convex first bulge of valve body, is equipped with the first recess that supplies first bulge to stretch into on the valve body, and in the first recess was located to the gasket, first bulge butt was at the gasket top surface, and the valve gap makes the inseparable butt of valve gap on the gasket through unsmooth cooperation with the axial of valve body, improves axial sealed effect.

5. The utility model provides a gate valve, all be equipped with the wash port about the support, and two first wash ports on upper portion are 90 and arrange, two second wash ports of lower part are 90 and arrange, when gate valve vertical layout, the second wash port of support lower part discharge can be followed to ponding in the support inner chamber, when the gate valve level was arranged, support inner chamber ponding can be discharged through first wash port and second wash port, diversely prevent ponding, avoid support inner chamber ponding to lead to support inner wall or valve rod corrosion, prevent that corrosion thing card from going into in the filler, strain the valve rod.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic view of a gate valve provided in embodiment 2 of the present invention;

FIG. 2 is an enlarged view of a portion D of FIG. 1;

FIG. 3 is a partial enlarged view of the portion E of FIG. 1;

FIG. 4 is a schematic view of the stent of FIG. 1;

description of reference numerals:

1-valve cover; 11-a first step; 12-a second step; 13-a second via; 14-a first projection; 2-a valve stem; 31-V type filler; 32-graphite filler; 33-a packing grommet; 4-a stopper ring; 5-a bracket; 51-a first drain hole; 52-second drain hole; 6-spacer ring; 61-a first via; 7-a valve body; 8-a radial seal member; 9-axial sealing member.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" 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 is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; 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 meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

Example 1

The present embodiment provides a valve stem sealing structure, as shown in fig. 3, which includes a bonnet 1, a valve stem 2, a packing assembly, a flooding plug ring 4, and a bracket 5.

Wherein, the inner wall of the valve cover 1 is provided with an annular groove, and the annular groove is provided with a first step 11; the valve rod 2 is arranged in the inner cavity of the valve cover 1 in a penetrating mode, and the annular groove and the outer wall surface of the valve rod 2 enclose a packing groove; the packing assembly and the universal piston ring 4 are both positioned in the packing groove, wherein the packing assembly is positioned on one side of the first step 11, which is far away from the middle cavity of the valve body 7, namely when the valve rod 2 is vertically arranged, the packing assembly is positioned above the first step 11; the universal plug ring 4 is sleeved on the valve rod 2 and is positioned on one side of the first step 11 close to the cavity in the valve body 7. The support 5 is arranged on the top surface of the valve cover 1 and applies pretightening force towards the cavity of the valve body 7 to the packing assembly.

According to the valve rod sealing structure with the structure, the packing component and the universal plug ring 4 are distributed on two sides of the step surface of the first step 11, and the bottom of the packing component is directly or indirectly abutted against the step surface of the first step 11. The inner diameter of the packing assembly is the same as that of the flooding piston ring 4, the outer diameter of the packing assembly is larger than that of the flooding piston ring 4, the packing assembly needs to be pressed and sealed by large pretightening force, the bottom of the packing assembly is directly or indirectly abutted against the step surface of the first step 11, the downward pretightening force is transmitted to the first step 11 and is blocked by the first step 11, so that the downward pretightening force is greatly reduced, and the flooding piston ring 4 is prevented from being damaged by pressure; simultaneously because the separation of first step 11, the pretightning force of packing subassembly can be exerted as required, can fully compress tightly the packing subassembly and make its inside and outside respectively the butt on valve rod 2 and valve gap 1, guarantee sealed effect.

Referring to fig. 3, the packing assembly includes V-shaped packing 31, graphite packing 32, and packing grommets 33. The annular recess also has a second step 12, and the second step 12 is arranged away from the cavity of the valve body 7 relative to the first step 11, i.e. the second step 12 is located above the first step 11. Graphite packing 32 is arranged above second step 12, packing backing ring 33 is arranged at the bottom of graphite packing 32, and the bottom of packing backing ring 33 abuts against the step surface of second step 12. The top of the V-shaped packing 31 abuts the bottom of the packing grommet 33. A spacing ring 6 is arranged between the V-shaped packing 31 and the flooding packing ring 4, the top surface of the spacing ring 6 is abutted against the bottom surface of the V-shaped packing 31, and the bottom surface of the spacing ring 6 is abutted against the step surface of the first step 11. For example, the V-type filler 31 is a V-type tetrafluoro filler.

The inner diameters of the flooding plug ring 4, the V-shaped filler 31 and the graphite filler 32 are the same, and the outer diameters are increased in sequence. Support 5 passes through bolt and nut fastening on valve gap 1, and support 5 bottom butt exerts decurrent pretightning force to graphite filler 32 on graphite filler 32, because graphite filler 32 radial thickness is thicker, needs great pretightning force just can compress tightly. The packing backing ring 33 is a metal ring, the packing backing ring 33 abuts against the step surface of the second step 12, and the pre-tightening force can only be transmitted to the packing backing ring 33 downwards, so that the larger pre-tightening force is prevented from being continuously transmitted downwards to crush the V-shaped packing 31 or the flooding ring 4.

When the medium pressure of the cavity in the valve body 7 is small, the medium pressure is transmitted to the flooding plug ring 4 from bottom to top to prop open the flooding plug ring 4 so as to realize the sealing of the valve rod 2; when the pressure of the cavity in the valve body 7 is higher, the medium pressure extrudes the plunger ring 4 upwards, and the plunger ring 4 expands to form a first seal; the flooding piston ring 4 is deformed by medium pressure to extrude the spacer ring 6 upwards, the spacer ring 6 moves upwards to reduce the distance between the spacer ring 6 and the packing backing ring 33 to further extrude the V-shaped packing 31, and the V-shaped packing 31 is compressed between the valve rod 2 and the valve cover 1 to form a second seal. The compression amount of the V-shaped packing 31 changes according to the first distance between the spacer ring 6 and the packing backing ring 33, the larger the medium pressure is, the smaller the first distance is, the larger the compression amount of the V-shaped packing 31 is, the tighter the V-shaped packing 31 is attached to the valve rod 2 and the valve rod 2, and the better the sealing performance is.

When the valve rod 2 is opened for multiple times to cause the abrasion of the V-shaped packing 31 and cause the sealing failure of the V-shaped packing 31, the graphite packing 32 on the upper part of the V-shaped packing 31 can still play a good sealing effect, and the graphite packing 32 is fireproof and can still play a sealing effect when a valve catches fire. And a plurality of seals are arranged at the valve rod 2, so that the sealing is reliable.

Referring to fig. 3, the middle part of spacer ring 6 thickness direction is equipped with first through-hole 61, the inside and outside both sides of first through-hole 61 are equipped with the drainage groove that communicates with first through-hole 61 respectively, be equipped with the second through-hole 13 with first through-hole 61 intercommunication on the valve gap 1, first through-hole 61 communicates with second through-hole 13 through the drainage groove in the outside, second through-hole 13 is as the urgent filling hole of filler, and under emergency, accessible second through-hole 13 injects the filler mud into the filling groove, plays urgent sealing action.

Example 2

The embodiment provides a gate valve, as shown in fig. 1, which includes the valve stem sealing structure and the valve body 7 in embodiment 1, the packing component and the plunger ring 4 at the valve stem 2 of the gate valve are distributed on two sides of the step surface of the first step 11, the bottom of the packing component directly or indirectly abuts against the step surface of the first step 11, the downward pretightening force is transmitted to the first step 11 and is blocked, so that the plunger ring 4 can be prevented from being crushed; because the separation of first step 11, the pretightning force of packing subassembly can be exerted as required, can fully compress tightly the packing subassembly and make its inside and outside respectively the butt on valve rod 2 and valve gap 1, guarantee sealed effect.

Referring to fig. 2, an annular step is arranged on the periphery of the outer side of the bottom of the valve cover 1 and clamped at the top of the valve body 7; the annular step comprises a horizontal surface and a vertical surface, a radial sealing part 8 is arranged between the vertical surface and the valve body 7, and an axial sealing part 9 is arranged between the horizontal surface and the valve body 7, for example, the radial sealing part 8 is an O-shaped ring, and the axial sealing part 9 is a gasket.

Referring to fig. 1, the valve body 7 is fastened and connected with the valve cover 1 through a plurality of studs and nuts in a circle in the axial direction, and in the use or transportation process of the gate valve, part of nuts are loosened due to vibration, so that the valve cover 1 is not tightly attached to the valve body 7 in the axial direction, and the leakage risk exists. The joint of the valve body 7 and the valve cover 1 is provided with radial and axial seals, and when partial nuts are loosened to reduce the pretightening force applied by the valve cover 1 to the gasket to cause the axial seal to lose efficacy, the radial O-shaped ring can still play a role in sealing to prevent the valve from leaking.

Referring to fig. 2, the horizontal plane of the annular step of the valve cover 1 is provided with a first protruding portion 14 protruding towards the valve body 7, the valve body 7 is provided with a first groove for the first protruding portion 14 to extend into, the gasket is arranged in the first groove, the first protruding portion 14 abuts against the top surface of the gasket, the valve cover 1 and the valve body 7 are axially matched to enable the valve cover 1 to abut against the gasket tightly through concave-convex fit, and the axial sealing effect is improved.

Referring to fig. 1, a bracket 5 is provided on the upper portion of the valve cap 1, the bracket 5 is fastened to the valve cap 1 by bolts and nuts, referring to fig. 4, drain holes are provided on the top and bottom of the bracket 5, and preferably, two first drain holes 51 communicated with the inner cavity of the bracket 5 are provided on the upper portion of the bracket 5, and the two first drain holes 51 are arranged perpendicular to each other in the circumferential direction of the bracket 5; the bottom of the bracket 5 is provided with two second drainage holes 52 communicated with the inner cavity of the bracket 5, and the two second drainage holes 52 are arranged in the circumferential direction of the bracket 5 and are perpendicular to each other. All be equipped with the wash port about 5 supports, and two first wash ports 51 on upper portion are 90 and arrange, two second wash ports 52 of lower part are 90 and arrange, when gate valve vertical layout, the second wash port 52 of 5 lower parts of supports can be followed to ponding in the 5 inner chambers of supports discharges, when the gate valve level was arranged, 5 inner chamber ponding of supports can be discharged through first wash port 51 and second wash port 52, can diversely prevent ponding, avoid 5 inner chamber ponding of supports to lead to 5 inner walls of supports or 2 corrosion of valve rod, prevent that corrosion thing card from going into in the filler, pull valve rod 2.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.

Claims

1. A valve rod sealing structure is characterized by comprising

The valve cover (1), the inner wall of the valve cover (1) is provided with an annular groove; the annular groove has a first step (11);

the valve rod (2) is arranged in the valve cover (1) in a penetrating mode; the annular groove and the outer wall surface of the valve rod (2) enclose a packing groove;

the packing assembly is arranged in the packing groove and is positioned on one side, away from the middle cavity of the valve body (7), of the first step (11);

the universal plug ring (4) is sleeved on the valve rod (2) and is positioned in the packing groove, and the universal plug ring (4) is positioned on one side, close to the middle cavity of the valve body (7), of the first step (11);

the support (5) is arranged on the top surface of the valve cover (1) and applies pre-tightening force towards the middle cavity of the valve body (7) to the packing assembly.

2. The valve stem seal structure of claim 1, wherein the packing assembly comprises a V-shaped packing (31), and the V-shaped packing (31) is arranged on a side of the first step (11) far away from the cavity in the valve body (7).

3. The valve stem sealing structure according to claim 2, wherein the annular groove further has a second step (12), the second step (12) being disposed away from the cavity in the valve body (7) with respect to the first step (11); the packing component further comprises graphite packing (32), and the graphite packing (32) is arranged on one side, away from the cavity in the valve body (7), of the second step (12).

4. The valve stem sealing structure according to claim 3, wherein the packing assembly further comprises a packing backing ring (33) arranged at the bottom of the graphite packing (32), and the bottom of the packing backing ring (33) abuts against the step surface of the second step (12); the top of the V-shaped packing (31) abuts against the bottom of the packing backing ring (33).

5. The valve stem sealing structure according to any one of claims 2-4, further comprising a spacer ring (6) provided between the flooding plug ring (4) and the V-packing (31); the bottom of the spacer ring (6) is abutted against the step surface of the first step (11); the bottom of the V-shaped packing (31) abuts against the top of the spacer ring (6).

6. The valve stem seal structure according to claim 5, wherein a first through hole (61) is provided in a middle portion in a thickness direction of the spacer ring (6); and a second through hole (13) communicated with the first through hole (61) is formed in the valve cover (1).

7. A gate valve comprising the stem seal structure of any one of claims 1 to 6.

8. The gate valve of claim 7, further comprising a valve body (7), wherein an annular step is arranged around the outer side of the bottom of the valve cover (1), and the annular step is clamped at the top of the valve body (7); the annular step comprises a horizontal plane and a vertical plane, and a radial sealing part (8) is arranged between the vertical plane and the valve body (7); an axial sealing component (9) is arranged between the horizontal plane and the valve body (7).

9. A gate valve according to claim 8, characterized in that the horizontal surface is provided with a first protrusion (14) protruding towards the valve body (7), that the valve body (7) is provided with a first recess into which the first protrusion (14) protrudes, and that the axial sealing member (9) is arranged in the first recess.

10. Gate valve according to any of claims 7-9, characterised in that the top and bottom of the support (5) are provided with drainage holes, respectively, which communicate with the inner cavity of the support (5).