阅读说明：本技术 一种偏移补偿衬氟球阀 (Offset compensation fluorine-lined ball valve ) 是由 薛力 于 2020-07-21 设计创作，主要内容包括：本发明公开了一种偏移补偿衬氟球阀,包括：具有导向通道的阀体以及与阀体配合的阀盖、阀座、阀杆和阀球；其中：密封填料包括主体部和由主体部底部斜向下延伸形成的延伸部；主体部具有开口朝上并与阀杆同轴的环槽,环槽内设有与其内壁抵靠并受阀盖施压的柔性胀紧环；延伸部的下边缘与阀杆形成抱合,且延伸部的外壁与导向通道的内壁之间具有间隙空间；延伸部与主体部配合在延伸部的内侧与主体部底部之间形成绕阀杆环布布置的密闭空间、该密闭空间内填充有密封膏。本发明可以使阀杆具有一定的偏移量,且偏移时不会影响密封的效果。(The invention discloses an offset compensation fluorine-lined ball valve, which comprises: the valve comprises a valve body with a guide channel, and a valve cover, a valve seat, a valve rod and a valve ball which are matched with the valve body; wherein: the sealing filler comprises a main body part and an extension part formed by extending the bottom of the main body part downwards in an inclined mode; the main body part is provided with a ring groove with an upward opening and coaxial with the valve rod, and a flexible expansion ring which is abutted against the inner wall of the ring groove and is pressed by the valve cover is arranged in the ring groove; the lower edge of the extension part is in embracing fit with the valve rod, and a clearance space is formed between the outer wall of the extension part and the inner wall of the guide channel; the extension part and the main body part are matched between the inner side of the extension part and the bottom of the main body part to form a closed space distributed around the valve rod in a surrounding mode, and sealing paste is filled in the closed space. The invention can lead the valve rod to have certain offset, and the sealing effect can not be influenced when the valve rod is offset.)

1. An offset compensating fluorine-lined ball valve, comprising: the valve body (1), the valve body (1) has a guide channel which extends downwards from the top and is communicated with the interior of the valve body; a valve cover (2) installed on the top of the valve body (1) to be suitable for closing the guide channel, and the valve cover (2) is provided with a central hole coaxial with the guide channel; a valve seat (3) installed inside the valve body (1); a valve rod (4) with one end passing through the central hole of the valve cover (2) and extending into the valve body (1) through a sealing channel and capable of sliding in the central hole; a valve ball (5) located within the valve body (1) and coupled to the valve stem (4); wherein:

a sealing packing (6) is arranged between the inner wall of the guide channel and the outer wall of the valve rod (4), and the sealing packing (6) comprises a main body part (61) and an extension part (62) formed by extending the bottom of the main body part (61) downwards in an inclined mode; the main body part (61) is provided with a ring groove with an upward opening and coaxial with the valve rod (4), and a flexible expansion ring (10) which is abutted against the inner wall of the ring groove and is pressed by the valve cover (2) is arranged in the ring groove; the lower edge of the extension part (62) is in embracing fit with the valve rod (4), and a clearance space is formed between the outer wall of the extension part (62) and the inner wall of the guide channel; the extension part (62) and the main body part (61) are matched between the inner side of the extension part (62) and the bottom of the main body part (61) to form a sealed space (8) which is annularly distributed around the valve rod (4), and the sealed space (8) is filled with sealing paste.

2. Offset-compensating fluorine-lined ball valve according to claim 1, wherein the cross-sectional shape of the closed space (8) is a non-right triangle.

3. The offset-compensating fluorine-lined ball valve according to claim 1, wherein a positioning pressure pad (7) is arranged between the flexible expansion ring (10) and the valve cover (2); preferably, the material of the positioning pressure pad (7) is metal.

4. The offset-compensating fluorine-lined ball valve as recited in claim 1, wherein the flexible expansion ring (10) is made of a soft rubber.

5. The offset compensating fluorine lined ball valve according to claim 1, wherein the flexible expansion ring (10) is a rubber ring internally wrapped with a liquid medium.

6. The offset compensating fluorine lined ball valve of claim 1 wherein the extension (62) has an angle of less than 180 ° with the inner wall of the guide passage to form a clearance space; preferably, the extension (62) is at an acute angle to the inner wall of the guide channel.

7. The offset-compensating fluorine-lined ball valve according to claim 1, wherein the valve seat (3) is provided with a positioning groove (301); the valve body (1) is provided with a positioning bulge which is clamped into the positioning groove (301).

8. The offset compensation fluorine-lined ball valve according to claim 1, wherein the valve body (1) is provided with an anti-drop groove, and the anti-drop groove is an annular groove coaxial with the inlet and the outlet of the valve body (1); the valve seat (3) is provided with an anti-falling bulge (302) clamped in the anti-falling groove.

9. The offset-compensating fluorine-lined ball valve according to any one of claims 1 to 8, wherein the valve body (1) comprises a main valve body and an auxiliary valve body, a clearance groove (9) is formed at the joint surface of the main valve body and the auxiliary valve body, and the clearance groove (9) is filled with sealing paste.

10. The offset compensating fluorine lined ball valve of claim 9, wherein the junction surface of the primary valve body and the secondary valve body is divided into a metal junction surface (101) and a planar compression sealing surface (102), and the planar compression sealing surface (102) is located between the metal junction surface (101) and the clearance groove (9).

Technical Field

The invention relates to the technical field of ball valves, in particular to an offset compensation fluorine-lined ball valve.

Background

At present, the conditions for using the fluorine-lined ball valves in China mostly stay in the technology of manual valves, and the service life of switches of most fluorine-lined ball valves is short. But with the rise of fine chemical engineering, the market prospect of the self-control fluorine lining valve is huge. The requirements of the fine chemical industry on the valve can be diversified, but the most fundamental is that the service life of the valve switch is long, and the valve switch can smoothly meet the requirements of actual working conditions. Since the offset compensation fluorine-lined ball valve uses fluorine-lined rubber (PFA or F46 and PTFE) to prevent the valve from being corroded, the ball needs to be connected with the valve stem, and the ball is subjected to the pressure of the medium in the pipeline when being turned off, so that the ball offset can be combined with the valve stem to offset and cause valve leakage.

Disclosure of Invention

In order to solve the technical problems in the background art, the invention provides an offset compensation fluorine-lined ball valve.

The invention provides an offset compensation fluorine-lined ball valve, which comprises: a valve body having a guide passage extending downward from a top thereof and communicating an interior thereof; a valve cover mounted on the top of the valve body to close the guide passage, the valve cover having a central hole coaxial with the guide passage; a valve seat mounted inside the valve body; a valve rod with one end passing through the central hole of the valve cover, extending into the valve body through a sealing channel and sliding in the central hole; a valve ball located within the valve body and coupled to the valve stem; wherein:

the sealing filler comprises a main body part and an extension part formed by extending the bottom of the main body part downwards in an inclined mode; the main body part is provided with a ring groove with an upward opening and coaxial with the valve rod, and a flexible expansion ring which is abutted against the inner wall of the ring groove and is pressed by the valve cover is arranged in the ring groove; the lower edge of the extension part is in embracing fit with the valve rod, and a clearance space is formed between the outer wall of the extension part and the inner wall of the guide channel; the extension part and the main body part are matched between the inner side of the extension part and the bottom of the main body part to form a closed space distributed around the valve rod in a surrounding mode, and sealing paste is filled in the closed space.

Preferably, the cross section of the closed space is in a shape of a non-right triangle.

Preferably, a positioning pressure pad is arranged between the flexible expansion ring and the valve cover.

Preferably, the material of the positioning pressure pad is metal.

Preferably, the material of the flexible expansion ring is soft rubber.

Preferably, the flexible expansion ring is a rubber ring wrapped with a liquid medium.

Preferably, the extension portion has an angle of less than 180 ° with the inner wall of the guide channel to form a clearance space.

Preferably, the included angle between the extension part and the inner wall of the guide channel is an acute angle.

Preferably, a positioning groove is arranged on the valve seat; the valve body is provided with a positioning bulge which is clamped into the positioning groove.

Preferably, the valve body is provided with an anti-falling groove which is an annular groove coaxial with the inlet and the outlet of the valve body; the valve seat is provided with an anti-falling bulge clamped in the anti-falling groove.

Preferably, the valve body comprises a main valve body and an auxiliary valve body, a clearance groove is formed in the joint surface of the main valve body and the auxiliary valve body, and sealing paste is filled in the clearance groove.

Preferably, the joint surface of the main valve body and the auxiliary valve body is divided into a metal joint surface and a plane compression sealing surface, and the plane compression sealing surface is positioned between the metal joint surface and the clearance groove.

In the invention, the packing seal at the valve rod is arranged into a structure of the main body part and the extension part, and a clearance space is formed between the outer wall of the extension part and the inner wall of the guide channel, so that when the valve is opened, inflowing medium can enter the clearance space to press the extension part from the outside of the extension part to enable the extension part to hold the valve rod tightly to form a first seal, namely a self-pressing seal; meanwhile, injecting sealing paste into a closed space between the extension part and the bottom of the main body part to form a second seal; set up in the annular of main part rather than leaning on and receive the flexible bloated straining ring that the valve gap applyed pressure to utilize the flexible bloated straining ring of valve gap extrusion to push the valve rod in the main part side portion to form the third and seal, the setting of three seal structure can make the valve rod have certain offset, and can not influence sealed effect during the skew, thereby make the valve ball can compensate the wearing and tearing of disk seat in order to satisfy sealed condition through the mode of skew, and then make the life extension of this ball valve.

Drawings

FIG. 1 is a schematic structural diagram of an offset compensated fluorine-lined ball valve according to the present invention;

FIG. 2 is a cross-sectional view taken along line B-B of FIG. 1;

FIG. 3 is an enlarged view of a portion of FIG. 2;

FIG. 4 is a schematic view of the valve seat of an offset compensated fluorine-lined ball valve according to the present invention;

fig. 5 is a schematic structural diagram of the positioning pressure pad in an offset compensation fluorine-lined ball valve.

Detailed Description

The technical solution of the present invention will be described in detail below with reference to specific examples.

Referring to fig. 1 to 5, the present invention provides an offset compensation fluorine-lined ball valve, including: a valve body 1, the valve body 1 having a guide passage extending downward from a top thereof and communicating with an interior thereof; a valve cap 2 installed on the top of the valve body 1 to be suitable for closing the guide passage, and the valve cap 2 having a central hole coaxial with the guide passage; a valve seat 3 installed inside the valve body 1; a valve rod 4 with one end passing through the central hole of the valve cover 2, extending into the valve body 1 through a sealing channel and sliding in the central hole; a valve ball 5 located inside the valve body 1 and coupled to the valve stem 4; wherein:

the sealing packing 6 includes a main body portion 61 and an extension portion 62 formed by extending obliquely downward from the bottom of the main body portion 61; the lower edge of the extension part 62 forms a hugging connection with the valve rod 4, and a clearance space is arranged between the outer wall of the extension part 62 and the inner wall of the guide channel, so that when the valve is opened, the medium enters the valve body 1 and is pressed from the outer side of the extension part 62 to hug the valve rod 4 to form a first seal, namely a self-pressing seal.

The extension part 62 and the main body part 61 are matched to form a sealed space 8 annularly distributed around the valve rod 4 between the inner side of the extension part 62 and the bottom of the main body part 61, and the sealed space 8 is filled with sealing paste to form a second seal.

The main body part 61 is provided with a ring groove with an upward opening and coaxial with the valve rod 4, and a flexible expansion ring 10 which is abutted with the inner wall of the ring groove and is pressed by the valve cover 2 is arranged in the ring groove, so that the main body part 61 is pressed to enable the inner side wall of the main body part 61 to be abutted with the valve rod 4 to form a third seal.

From the above, by arranging the packing seal 6 at the valve rod 4 in the structure of the main body part 61 and the extension part 62, and providing a clearance space between the outer wall of the extension part 62 and the inner wall of the guide channel, when the valve is opened, the inflowing medium can enter the clearance space to press the extension part 62 from the outside to make the extension part 62 hold the valve rod 4 tightly to form the first seal, namely, the self-pressing seal; meanwhile, injecting sealing paste into the closed space 8 between the extension part 62 and the bottom of the main body part 61 to form a second seal; the flexible expansion ring 10 which abuts against the annular groove of the main body part 61 and is pressed by the valve cover is arranged in the annular groove of the main body part 61, so that the valve cover 2 is utilized to extrude the flexible expansion ring 10 to push the inner side part of the main body part 61 to the valve rod 4 to form a third seal, the valve rod 4 can have a certain offset through the arrangement of the three sealing structures, the sealing effect cannot be influenced during the offset, the valve ball 5 can compensate the abrasion of the valve seat 3 in an offset mode to meet the sealing condition, and the service life of the ball valve is prolonged.

In addition, in the present embodiment, the cross-sectional shape of the enclosed space 8 is a non-right triangle to enhance the sealing effect.

In this embodiment, a metal positioning pressure pad 7 is disposed between the flexible expansion ring 10 and the valve cap 2, so that the pressure applied by the valve cap 2 is transmitted into the flexible expansion ring 10 through the metal positioning pressure pad 7.

In this embodiment, the flexible expansion ring 10 is made of soft rubber, or the flexible expansion ring 10 is a rubber ring wrapped with a liquid medium.

In this embodiment, an included angle is formed between the extending portion 62 and the inner wall of the guiding channel to form a gap space, and the included angle is an acute angle.

In this embodiment, the valve seat 3 is provided with a positioning groove 301; the valve body 1 is provided with a positioning bulge which is clamped into the positioning groove 301. The structure is arranged to prevent the valve seat 3 from rotating, so that the valve seat 2 cannot rotate when the valve is opened and closed, and the damage area cannot be enlarged when the valve seat 3 is slightly damaged locally.

In this embodiment, the valve body 1 is provided with an anti-drop groove, which is an annular groove coaxial with the inlet and outlet of the valve body 1; the valve seat 3 is provided with an anti-falling protrusion 302 clamped into the anti-falling groove, the valve seat 3 cannot axially move due to the structure, and the influence on the valve switch torsion due to the axial movement of the valve seat 3 is avoided.

In this embodiment, the valve body 1 includes a main valve body and an auxiliary valve body, a clearance groove 9 is provided at a joint surface of the main valve body and the auxiliary valve body, and the clearance groove 9 is filled with a sealing paste, so that the sealing property of the joint surface can be effectively improved. Meanwhile, in this embodiment, the joint surface of the main valve body and the auxiliary valve body is divided into a metal joint surface 101 and a plane compression seal surface 102, the plane compression seal surface 102 is located between the metal joint surface 101, that is, the joint portion is made of a material between metal and the clearance groove 9, and the arrangement of the metal joint surface 102 can ensure that the distance between the main valve body and the auxiliary valve body is constant, and the torsion and the sealing performance of the valve cannot be affected by tightening of bolts on the joint surface.

In this embodiment, the sealant is an antiseptic sealant.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.