CN213393619U

CN213393619U - Improved rod sealing device of flat valve

Info

Publication number: CN213393619U
Application number: CN202022345236.2U
Authority: CN
Inventors: 陈其灜; 郭宇翔
Original assignee: Aisi Petroleum Equipment Co ltd
Current assignee: Aisi Petroleum Equipment Co ltd
Priority date: 2020-10-21
Filing date: 2020-10-21
Publication date: 2021-06-08
Anticipated expiration: 2030-10-21

Abstract

The utility model discloses an improved rod sealing device of a flat valve, which comprises a valve body, wherein a valve cover is fixed at the top of the valve body, a pipe hole which transversely penetrates through the valve body is arranged in the valve body, a valve hole which vertically penetrates through the valve body and the valve cover is also arranged in the valve body, a valve seat is arranged in the valve hole, and a valve plate which moves up and down along the valve hole is arranged in the valve seat; the top of the valve plate is fixedly connected with a valve rod, a positioning hole which is positioned above the valve hole and communicated with the valve hole is arranged in the valve cover, and a sleeve which is sleeved outside the valve rod is fixed in the positioning hole; a sealing ring sleeved outside the valve rod is arranged in the positioning hole; the cross section of the sealing ring is elliptic, and gaps are arranged between the top of the sealing ring and the bottom surface of the sleeve, between the bottom of the sealing ring and the hole bottom surface of the positioning hole; the bottom surface of the sleeve is provided with an upward concave upper groove, and the hole bottom surface of the positioning hole is provided with a downward concave lower groove; the utility model discloses on sealed good enough basis, promoted the life of sealing washer, avoid frequently changing the sealing washer.

Description

Improved rod sealing device of flat valve

Technical Field

The utility model relates to a wafer valve field especially relates to an improved generation pole sealing device of wafer valve.

Background

A flat gate valve is a sliding valve whose closing member is a parallel gate plate. The closing member can be a single gate or a double gate with a spreader mechanism in between. The pressing force of the gate plate to the valve seat is controlled by the medium pressure acting on the floating gate plate or the floating valve seat. In the case of a double-gate plate gate valve, the pressing force can be supplemented by a spreading mechanism between the two gate plates.

In the prior art, a series of sealing rings arranged along the rod wall are arranged at the contact part of the push rod part at the upper part of the valve rod and the valve cover in the valve cover, and the cross section of each sealing ring is square. The sealing performance of the sealing ring structure is good, but the push rod part and the sealing ring have relative movement due to the frequent movement of the push rod part at the valve cover, and the close arrangement can bring larger pressure to the sealing ring, so that the service life of the sealing ring is reduced. And because the sealing pressure itself of ejector pin portion department is less, this kind of sealed mode is applicable to the condition of very little partly high-pressure micro flow, under the condition of low pressure, can appear sealed excessively, need bring more troubles because the sealing washer life-span is lower leads to often changing the sealing washer on the contrary.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a solve the shortcoming that exists among the prior art, and the improved generation pole sealing device of a wafer valve that proposes.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

an improved rod sealing device of a flat valve comprises a valve body, wherein a valve cover is fixed at the top of the valve body, a pipe hole which penetrates through the valve body in the transverse direction is formed in the valve body, a valve hole which penetrates through the valve body and the valve cover in the vertical direction is also formed in the valve body, a valve seat is installed in the valve hole, and a valve plate which moves up and down along the valve hole is installed in the valve seat; the top of the valve plate is fixedly connected with a valve rod, a positioning hole which is positioned above the valve hole and communicated with the valve hole is formed in the valve cover, and a sleeve which is sleeved outside the valve rod is fixed in the positioning hole; a sealing ring sleeved outside the valve rod is arranged in the positioning hole; the section of the sealing ring is oval, and gaps are formed between the top of the sealing ring and the bottom surface of the sleeve, between the bottom of the sealing ring and the hole bottom surface of the positioning hole; the bottom surface of the sleeve is provided with an upward concave upper groove, and the hole bottom surface of the positioning hole is provided with a downward concave lower groove.

Preferably, the seal ring is crimped between the face of the stem and the wall of the positioning hole.

Preferably, the groove surfaces of the upper groove and the lower groove are both arc surfaces.

Preferably, the length of the sealing ring is greater than one half of the distance between the bottom surface of the sleeve and the bottom surface of the positioning hole.

Preferably, a sealing plate arranged in parallel with the valve plate is connected between the valve seat and the valve plate.

Preferably, the sealing plate is annular, and a sealing gasket is connected in an annular hole of the sealing plate; the sealing gasket is in a ring shape, and the ring hole of the sealing gasket is communicated with the pipe hole.

The utility model has the advantages that: the utility model discloses in, a plurality of inseparable ranges and the cross-section that set up between valve rod and valve gap and the sleeve among the prior art are square sealing washer, improve into oval sealing washer, and set up the headspace in the locating hole, do not let the locating hole diapire contact in sealing washer and sleeve bottom and the valve gap, make the sealing washer have certain removal space, pressure and the sealed surplus condition can not appear, on sealed good enough basis, the life of sealing washer has been promoted, avoid frequently changing the sealing washer.

Drawings

FIG. 1 is a block diagram of the flat valve of the present invention;

fig. 2 is an enlarged view of a point a in fig. 1.

Reference numbers in the figures: the valve comprises a valve body 1, a valve cover 2, a pipe hole 3, a valve hole 4, a valve seat 5, a valve plate 6, a valve rod 7, a communication hole 8, a sealing plate 9, a sealing gasket 10, a sleeve 11, a positioning hole 12, a sealing ring 13, an upper groove 14 and a lower groove 15.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Referring to fig. 1 and 2, an improved rod sealing device of a flat valve comprises a valve body 1, wherein a valve cover 2 is fixed at the top of the valve body 1, a pipe hole 3 which transversely penetrates through the valve body 1 is formed in the valve body 1, a valve hole 4 which vertically penetrates through the valve body 1 and the valve cover 2 is also formed in the valve body 1, a valve seat 5 is installed in the valve hole 4, and a valve plate 6 which moves up and down along the valve hole 4 is installed in the valve seat 5; the top of the valve plate 6 is fixedly connected with a valve rod 7, a positioning hole 12 which is positioned above the valve hole 4 and communicated with the valve hole 4 is arranged in the valve cover 2, and a sleeve 11 which is sleeved outside the valve rod 7 is fixed in the positioning hole 12; a sealing ring 13 sleeved outside the valve rod 7 is arranged in the positioning hole 12; the section of the sealing ring 13 is oval, and gaps are arranged between the top of the sealing ring and the bottom surface of the sleeve 11, between the bottom of the sealing ring and the bottom surface of the positioning hole 12; the bottom surface of the sleeve 11 is provided with an upwardly concave upper groove 14, and the hole bottom surface of the positioning hole 12 is provided with a downwardly concave lower groove 15.

In the present embodiment, the packing 13 is pressed between the face of the stem 7 and the hole wall of the positioning hole 12.

In the present embodiment, the groove surfaces of the upper groove 14 and the lower groove 15 are both arc surfaces.

In the present embodiment, the length of the seal ring 13 is greater than half of the distance between the bottom surface of the sleeve 11 and the hole bottom surface of the positioning hole 12.

In the present embodiment, a seal plate 9 disposed in parallel with the valve plate 6 is connected between the valve seat 5 and the valve plate 6.

In this embodiment, the sealing plate 9 is circular, and a sealing gasket 10 is connected to the circular hole; the sealing gasket 10 is circular ring, and the ring hole is communicated with the pipe hole 3.

The working principle is as follows: the moving of the hand wheel drives the valve rod 7 to move up and down in the valve hole 4, so that the pipe hole 3 is shielded greatly to realize the closing of the valve, or the communication hole 8 is communicated with the pipe hole 3 to realize the opening of the valve; here, the sealing plate 9 and the sealing gasket 10 can play a role of sealing, and are main sealing positions, the sealing pressure born by the sealing plate is large, the secondary sealing position is in the valve cover 2, the position above the valve rod 7 is positioned in the valve cover 2 and connected with the hand wheel, and leakage can exist if the sealing of the rod face position of the valve rod 7 is poor, so that sealing is needed in the position; in the utility model, in this position, namely in the locating hole 12, oval-shaped sealing washer 13 has been set up, the both sides of sealing washer 13 can be pressed between the face of rod 7 and the interior pore wall of valve gap 2, the structure of the straight face is shown, such crimping can guarantee the perfect leakproofness, compare with the mode that utilizes the sealing washer aperture to adapt to the diameter of rod 7 among the prior art, here adopt oval-shaped sealing washer 13 to be pressed out the mode of straight face, before the sealing washer 13 takes place the complete failure that the material spills over, can guarantee to seal intact, and in the time of installation, because the circular arc radian of sealing washer 13 top and bottom, make the valve rod 7 assemble comparatively simply; on the basis, the sealing ring 13 is arranged to be not filled in the positioning hole 12, so that the arc line structure comprising the top and the bottom of the sealing ring 13 is realized, and the extrusion force is reduced when the sealing ring 13, the valve rod 7 and the valve cover 2 move relatively, thereby prolonging the service life of the sealing ring 13; on this basis, set up upper groove 14 and lower groove 15, make sealing washer 13 move in with the contact between sleeve 11 and the valve gap 2 more laminate, increase area of contact reduces the extrusion force, and the cambered surface also can play better pressure release effect, this life that can both promote sealing washer 13.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", 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 to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims

1. An improved rod sealing device of a flat valve comprises a valve body (1), wherein a valve cover (2) is fixed at the top of the valve body (1), a pipe hole (3) which transversely penetrates through the valve body (1) is formed in the valve body (1), a valve hole (4) which vertically penetrates through the valve body (1) and the valve cover (2) is further formed in the valve body (1), a valve seat (5) is installed in the valve hole (4), and a valve plate (6) which moves up and down along the valve hole (4) is installed in the valve seat (5); the valve is characterized in that a valve rod (7) is fixedly connected to the top of the valve plate (6), a positioning hole (12) which is located above the valve hole (4) and communicated with the valve hole (4) is formed in the valve cover (2), and a sleeve (11) sleeved outside the valve rod (7) is fixed in the positioning hole (12); a sealing ring (13) sleeved outside the valve rod (7) is arranged in the positioning hole (12); the section of the sealing ring (13) is oval, and gaps are formed between the top of the sealing ring and the bottom surface of the sleeve (11) and between the bottom of the sealing ring and the bottom surface of the positioning hole (12); an upper concave groove (14) is formed in the bottom surface of the sleeve (11), and a lower concave groove (15) is formed in the hole bottom surface of the positioning hole (12).

2. The improved stem seal of a flat valve as set forth in claim 1, characterized in that said sealing ring (13) is crimped between the face of said stem (7) and the wall of said positioning hole (12).

3. The improved stem seal of a flat valve as set forth in claim 1 wherein the groove surfaces of said upper groove (14) and said lower groove (15) are both arcuate surfaces.

4. The improved stem seal of a flat valve as set forth in claim 1 wherein said seal ring (13) has a length greater than one-half of the distance between the bottom surface of said sleeve (11) and the bottom surface of said pilot hole (12).

5. Improved rod sealing device for a flat valve according to claim 1, characterized in that a sealing plate (9) is connected between the valve seat (5) and the valve plate (6) and arranged parallel to the valve plate (6).

6. The improved stem seal of a flat valve as set forth in claim 5, characterized in that said sealing plate (9) is of annular shape with a sealing gasket (10) attached to the annular hole; the sealing gasket (10) is in a ring shape, and the ring hole of the sealing gasket is communicated with the pipe hole (3).