阅读说明：本技术 一种具有在线检修功能的深冷轴流式止回阀 (Cryogenic axial flow check valve with online maintenance function ) 是由 张清双 吴春豪 张静 贾琦月 于 2020-05-29 设计创作，主要内容包括：一种具有在线检修功能的深冷轴流式止回阀,包括阀体、导流套、阀盖、阀瓣,阀盖为上装式阀盖,阀盖上设有一个支撑筋,阀体内部设有两个支撑筋,导流套上设有三个支撑筋对应的支撑槽,导流套支撑槽中设有用螺钉Ⅱ与导流套固定的防转块,导流套内部通过设有导向架,导向架头部及尾部设有轴承,导向架与阀瓣之间设有弹簧,弹簧安装在导向架与阀瓣的限位孔之中,阀瓣与导流套上设有凸起筋,凸起筋上设有对应的销轴孔,导流套尾部设有导流锥,阀座与阀体间设有金属缠绕垫和泛塞,阀体与阀盖间设有缠绕垫片。本发明的有益效果,通过上装式阀盖的设计,能够实现在线检修功能。(The utility model provides an axial-flow type check valve of cryrogenic with overhaul function on line, which comprises a valve body, the water conservancy diversion cover, the valve gap, the valve clack, the valve gap is facial make-up formula valve gap, be equipped with a brace rod on the valve gap, the inside two brace rods that are equipped with of valve body, be equipped with the support groove that three brace rod corresponds on the water conservancy diversion cover, be equipped with the anti-rotation piece of fixing with screw II and water conservancy diversion cover in the water conservancy diversion cover support groove, the inside leading truck that is equipped with of water conservancy diversion cover, leading truck head and afterbody are equipped with the bearing, be equipped with the spring between leading truck and the valve clack, spring mounting is among the spacing hole of leading truck and valve clack, be equipped with protruding muscle on valve clack and the water conservancy diversion cover, be equipped with the round. The valve cover has the beneficial effect that the online maintenance function can be realized through the design of the upper-mounted valve cover.)

1. A deep cooling axial flow type check valve with online maintenance function comprises a valve body, a flow guide sleeve, a valve cover and a valve clack, and is characterized in that the valve cover is an upper-mounted valve cover, a support rib is arranged on the valve cover, two support ribs are arranged inside the valve body, support grooves corresponding to the three support ribs are arranged on the flow guide sleeve, an anti-rotation block fixed with a screw II and the flow guide sleeve is arranged in each support groove of the flow guide sleeve, a guide frame is arranged inside the flow guide sleeve, bearings are arranged at the head and the tail of the guide frame, a spring is arranged between the guide frame and the valve clack, the spring is arranged in a limiting hole of the guide frame and the valve clack, a flow guide cone is arranged at the tail of the flow guide sleeve, a protruding rib is arranged on the valve clack and the flow guide sleeve, a corresponding pin shaft hole is arranged on the protruding rib, a metal winding pad and, and a winding gasket is arranged between the valve body and the valve cover and is fixedly connected with the valve cover through a fastener.

2. The cryogenic axial flow check valve with on-line maintenance function as claimed in claim 1, wherein said three support ribs are uniformly distributed with an angle of 120 ° between each two support ribs.

3. The cryogenic axial flow check valve with in-line service capability of claim 1 wherein said flooding plug is a back-to-back flooding plug.

Technical Field

The invention relates to a check valve, in particular to a cryogenic axial flow check valve with an online maintenance function.

Background

In the LNG receiving station, the cryogenic axial flow type check valve is used for conveying an outlet of an pump and an outlet of a compressor unit of the LNG, and plays a role in preventing media from flowing backwards. The deep cooling axial flow check valve adopts butt welding connection mode according to the requirement of a receiving station, after a general axial flow check valve is welded on a pipeline, when a valve breaks down (acts unsmooth, sealing failure and the like) and needs to be overhauled, the valve can only be integrally cut out for maintenance, because the valve is cut, the structural length can be shortened, after maintenance, the valve needs to be subjected to surfacing welding at two ends of the valve and processed into corresponding groove envelope lines to be welded on the pipeline again, and the requirement of online maintenance function cannot be met.

Disclosure of Invention

In order to overcome the problems in the prior art, the invention provides a cryogenic axial flow check valve with an online maintenance function.

The invention adopts the technical scheme that the cryogenic axial flow check valve with the online maintenance function comprises a valve body, a flow guide sleeve, a valve cover and a valve clack, wherein the valve cover is an upper-mounted valve cover, the valve cover is provided with a support rib, two support ribs are arranged inside the valve body, the flow guide sleeve is provided with three support grooves corresponding to the support ribs, an anti-rotation block fixed with the flow guide sleeve by a screw II is arranged in the support groove of the flow guide sleeve, a guide frame is arranged inside the flow guide sleeve, bearings are arranged at the head part and the tail part of the guide frame, a spring is arranged between the guide frame and the valve clack, the spring is arranged in a limiting hole of the guide frame and the valve clack, a convex rib is arranged on the valve clack and the flow guide sleeve, a corresponding pin shaft hole is arranged on the convex rib, a flow guide cone is arranged at the tail part of the flow guide sleeve, and the connection is fixed through a fastener.

Furthermore, the three support ribs are uniformly distributed, and the angle between every two support ribs is 120 degrees.

Further, the flooding plug is a back-to-back flooding plug.

The invention has the beneficial effects that:

the online maintenance function can be realized through the design of the upper-mounted valve cover; the guide sleeve is designed into a single part and is arranged on the supporting rib inside the valve body, so that the detachable function is realized. The axial direction of the flow guide sleeve is limited by the valve body and the support rib on the valve cover, and an anti-rotation block is arranged in the support groove of the flow guide sleeve to limit the flow guide sleeve to rotate under the action of a medium; the valve clack and the flow guide sleeve are provided with protruding ribs which are provided with corresponding pin shaft holes, the spring is tightened by a nut, so that the valve clack and the flow guide sleeve are fixed at a certain position and then taken out; the valve seat is designed into a double-sealing structure of a metal winding pad and a flooding plug, so that the sealing is more reliable.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a cross-sectional view A-A of FIG. 1;

FIG. 3 is a perspective view of the rotation prevention block;

FIG. 4 is a perspective view of two support ribs inside the valve body;

FIG. 5 is a schematic view of a sealing structure between a valve body and a valve seat;

FIG. 6 is a side view of the valve cover;

fig. 7 is a schematic sectional view of three support ribs.

In the figure: 1. a valve body; 2. a flow guide cone; 3. a flow guide sleeve; 4. a guide shaft; 5. a guide frame; 6. a spring; 7. a bearing; 8. a valve flap; 9. a valve seat retainer; 10. a screw I; 11. a valve seat; 12. a metal wound gasket; 13. flooding and plugging; 14. winding the gasket; 15. a fastener; 16. a valve cover; 17. a pin shaft; 18. a nut; 19. a rotation prevention block; 20. and a screw II.

Detailed Description

As shown in the figure, the cryogenic axial flow check valve with the online maintenance function comprises a valve body 1, a flow guide sleeve 3, a valve cover 16 and a valve clack 8, wherein the valve cover 16 is an upper-mounted valve cover, a support rib is arranged on the valve cover 16, two support ribs are arranged inside the valve body 1, three support grooves corresponding to the three support ribs are arranged on the flow guide sleeve 3, the three support ribs are uniformly distributed, the angle between every two support ribs is 120 degrees, and the support and axial limiting effects are achieved on the flow guide sleeve 3; an anti-rotation block 19 fixed with the guide sleeve 3 by a screw II 20 is arranged in the support groove of the guide sleeve 3, so that the guide sleeve 3 is prevented from rotating under the action of a medium; the guide frame 5 is arranged in the guide sleeve 3, the bearings 7 are arranged at the head and the tail of the guide frame 5, the spring 6 is arranged between the guide frame 5 and the valve clack 8, the spring 6 is arranged in the limiting holes of the guide frame 5 and the valve clack 8, the guide cone 2 is arranged at the tail of the guide sleeve 3, when a medium flows back, the medium can only act on the valve clack 8 through the guide cone 2, a certain impact force is reduced, and the slow closing effect is achieved; the valve clack 8 and the flow guide sleeve 3 are provided with convex ribs, the convex ribs are provided with corresponding pin shaft holes, and the spring is tightened by using a pin shaft and a nut, so that the valve clack and the flow guide sleeve are fixed at a certain position and are convenient to take out; a metal winding pad 12 and a flooding plug 13 are arranged between the valve seat 11 and the valve body 1 and are fixed through a valve seat fixer 9 and a screw I10, and when the metal winding pad 12 leaks, the flooding plug 13 plays a role in compensating the leakage; a winding gasket 14 is arranged between the valve body 1 and the valve cover 16, the winding gasket 14 is fixedly connected through a fastening piece 15, and the compression amount of the winding gasket 14 is controlled to realize sealing through the principle of quantitative compression.

When the valve is internally jammed or fails in sealing, the online maintenance function is realized through the following steps:

step 1: disassembling the fastener 15 between the valve cover 16 and the valve body 1, and taking down the valve cover 16 and the winding sealing gasket 14 between the valve cover 16 and the valve body;

step 2: a pin shaft 17 is arranged in a corresponding pin shaft hole on the convex rib of the valve clack 8 and the flow guide sleeve 3, the tail part of the pin shaft 17 is provided with threads, the nut 18 is utilized to tighten the pretightening force of the spring, so that the valve clack 8 is opened to a certain position and fixed with the flow guide sleeve 3, and then the valve clack 8 and the flow guide sleeve 3 are integrally taken out from the supporting rib in the valve body and taken out of the valve cavity for next-step disassembly;

and step 3: disassembling the nut 18, taking the valve clack 8 out of the guide frame 5, and taking the spring 8 out;

and 4, step 4: the guide frame 5 and the flow guide sleeve 3 are disassembled, the guide frame 5 is taken down, and the bearings 7 at the head and the tail of the guide frame 5 are disassembled;

and 5: if the valve seat sealing piece needs to be replaced, the screw I10 on the valve seat fixer 9 is detached, and then the valve seat fixer 9 is screwed out of the valve body 1;

step 6: the valve seat 11 is removed, followed by the metal wound gasket 12 and the flooding plug 13, completing the valve disassembly.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.