High-pressure corrugated pipe stop valve

Abstract

A corrugated pipe assembly comprises an upper fixing ring, a corrugated pipe and a lower fixing head which are sequentially connected from top to bottom, a valve rod is sleeved with the lower fixing head, the lower fixing head is fixed to the lower fixing head, and the bottom of the lower fixing head is a conical part corresponding to a funnel section; according to the high-pressure corrugated pipe stop valve, an abutting ring is arranged on the inner wall of a middle cover, a funnel section is arranged on a lower cover, and the bottom of a lower fixing head of a corrugated pipe assembly is a conical part corresponding to the funnel section; the sealing effect formed by the conical part of the lower fixing head and the funnel section of the lower cover is excellent, and meanwhile, the gradient of the funnel section is also convenient for discharging impurities downwards; when the valve rod part is at the lower part, the lower fixing head and the funnel section of the lower cover form a seal, and a conducting medium cannot enter the corrugated pipe assembly; when the valve rod part is arranged on the upper portion, sealing is formed between the lower fixing head and the abutting ring, and a conduction medium cannot enter the corrugated pipe.

Description

Technical Field

[0001] The utility model relates to the field of stop valves, in particular to a high-pressure bellows stop valve. Background Art

[0002] High-pressure bellows globe valves are currently used to control fluid flow. They utilize a bellows seal structure to achieve high sealing performance and operate stably under high-pressure conditions. These valves are widely used in pipeline systems in the petroleum, chemical, and power industries, as well as other industries requiring high reliability and high-pressure resistance.

[0003] While the bellows provide a seal at the valve stem, they also minimize corrosion and damage from the media. However, the potential for bellows damage increases with highly corrosive media containing particulate matter, especially under high pressure. Therefore, bellows protection is crucial. Utility Model Content

[0004] The main purpose of the utility model is to provide a high-pressure bellows stop valve, aiming to solve the problem of high risk of abnormal bellows in the stop valve under high-pressure conditions.

[0005] In order to achieve the above object, the utility model provides a high-pressure bellows stop valve, comprising:

[0006] The valve body has a valve seat provided inside and a valve cover seat provided on the outer wall corresponding to the valve seat;

[0007] A valve cover assembly having a rod passage running through the middle thereof, the valve cover assembly comprising a lower cover mounted on the valve cover seat, a middle cover mounted on the lower cover, and an upper cover mounted on the middle cover, wherein the inner wall of the middle cover is provided with a holding ring, wherein the bottom end of the rod passage at the position of the lower cover is a small diameter section, and above the small diameter section is a funnel section;

[0008] a valve stem portion, mounted on the upper cover, comprising a valve stem passing through the upper cover, the middle cover, and the lower cover and arranged to be separated and engaged with the valve seat, a valve disc being mounted on the inner end of the valve stem, and a diameter of the valve stem being consistent with an inner diameter of the small-diameter section;

[0009] A bellows assembly comprises an upper fixing ring, a bellows, and a lower fixing head connected sequentially from top to bottom, wherein the upper fixing ring is clamped between the upper cover and the middle cover, the bellows is disposed within the valve cover assembly, and the lower fixing head is sleeved and fixed to the valve stem, with the bottom portion being a tapered portion corresponding to the funnel section;

[0010] Wherein, when the valve stem is in the upper position, a seal is formed between the lower fixed head and the supporting ring.

[0011] Furthermore, the lower fixing head includes conical lower fixing petals each occupying 180 degrees in the circumferential direction, and the two conical lower fixing petals are engaged and fixed to the valve stem.

[0012] Furthermore, an annular groove is provided on the valve stem at a position corresponding to the lower fixed head, and a fixing ring is provided on the lower fixed head corresponding to the annular groove.

[0013] Furthermore, the lower fixing head forms a seal with the inner wall of the rod channel within the lifting range.

[0014] Furthermore, the middle cover and the lower cover are connected to the valve cover seat by a set of bolts.

[0015] Furthermore, a filling cavity is provided on the inner periphery of the top end of the upper cover, and a filling cover is provided on the upper cover corresponding to the filling cavity.

[0016] Furthermore, the upper fixing ring, the bellows and the lower fixing head are connected by welding.

[0017] Furthermore, a sealing ring is stacked corresponding to the upper fixing ring.

[0018] Furthermore, a sealing ring is provided between the lower cover and the valve cover seat, a sealing ring is provided between the middle cover and the lower cover, and a sealing ring is provided between the upper cover and the middle cover.

[0019] Furthermore, the middle cover and the upper cover are connected by a set of bolts.

[0020] The utility model provides a high-pressure bellows stop valve, in which the inner wall of the middle cover is provided with a supporting ring, the lower cover is provided with a funnel section, and the bottom of the lower fixed head of the bellows assembly is a conical portion corresponding to the funnel section; the sealing effect formed by the conical portion of the lower fixed head and the funnel section of the lower cover is excellent, and the slope of the funnel section also facilitates the downward discharge of impurities; when the valve stem is at the bottom, the lower fixed head and the funnel section of the lower cover form a seal, and the conducting medium will not enter the bellows assembly; when the valve stem is at the top, a seal is formed between the lower fixed head and the supporting ring, and the conducting medium will not enter the bellows. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of a high-pressure bellows stop valve according to an embodiment of the present invention (the valve stem is in the downward position);

[0022] Figure 2 This is a schematic diagram of a high-pressure bellows stop valve according to an embodiment of the present invention (the valve stem is in an upward position);

[0023] Figure 3 This is a schematic diagram of a valve body in a high-pressure bellows stop valve according to an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the lower cover of a high-pressure bellows stop valve according to an embodiment of the present utility model;

[0025] Figure 5 This is a schematic diagram of the middle cover of a high-pressure bellows stop valve according to an embodiment of the present utility model;

[0026] Figure 6 This is a schematic diagram of the upper cover of a high-pressure bellows stop valve according to an embodiment of the present utility model;

[0027] Figure 7 This is a schematic diagram of the cooperation between the bellows assembly and the valve stem in a high-pressure bellows stop valve in one embodiment of the present utility model. DETAILED DESCRIPTION

[0028] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0029] Those skilled in the art will appreciate that, unless expressly stated otherwise, the singular forms “a”, “an”, “said”, “above” and “the” used herein may also include plural forms. It should be further understood that the term “comprising” used in the specification of the present invention refers to the presence of the features, integers, steps, operations, elements, units, modules and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, units, modules, components and / or groups thereof. It should be understood that when we refer to an element as being “connected” or “coupled” to another element, it may be directly connected or coupled to the other element, or there may be intermediate elements. In addition, “connected” or “coupled” as used herein may include wireless connection or wireless coupling. The term “and / or” used herein includes all or any unit and all combinations of one or more associated listed items.

[0030] Those skilled in the art will understand that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as generally understood by those skilled in the art in the field to which the present invention belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with their meanings in the context of the prior art, and will not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0031] Reference Figures 1 to 7 In one embodiment of the present invention, a high-pressure bellows stop valve comprises:

[0032] The valve body 100 has a valve seat 110 disposed therein and a valve cover seat 120 disposed on the outer wall thereof corresponding to the valve seat 110;

[0033] A valve cover assembly having a rod passage running through the middle thereof. The valve cover assembly comprises a lower cover 210 mounted on the valve cover seat 120, a middle cover 220 mounted on the lower cover 210, and an upper cover 230 mounted on the middle cover 220. The inner wall of the middle cover 220 is provided with a supporting ring 221. The bottom end of the rod passage at the position of the lower cover 210 is a small diameter section 211, and above the small diameter section 211 is a funnel section 212.

[0034] The valve stem 300 is mounted on the upper cover 230. The valve stem 300 includes a valve stem 310 that passes through the upper cover 230, the middle cover 220, and the lower cover 210 and is arranged to be separated and connected with the valve seat 110. A valve disc 320 is mounted on the inner end of the valve stem 310. The diameter of the valve stem 310 is consistent with the inner diameter of the small diameter section 211.

[0035] The bellows assembly includes an upper fixing ring 410, a bellows 420, and a lower fixing head 430 connected sequentially from top to bottom. The upper fixing ring 410 is clamped between the upper cover 230 and the middle cover 220. The bellows 420 is disposed within the valve cover assembly. The lower fixing head 430 is sleeved and fixed to the valve stem 310 and has a tapered portion 431 at its bottom corresponding to the funnel section 212.

[0036] When the valve stem 300 is in the upper position, a seal is formed between the lower fixing head 430 and the supporting ring 221 .

[0037] In the prior art, the possibility of bellows damage increases when the conducting medium contains highly corrosive particles and impurities, especially under high pressure conditions.

[0038] The utility model provides a high-pressure bellows stop valve, wherein a fluid channel is passed through the valve body 100, and a valve seat 110 is provided in the middle of the length direction of the fluid channel. A valve cover seat 120 is provided on the outer wall of the valve body 100 corresponding to the valve seat 110.

[0039] A rod channel runs through the middle of the valve cover assembly. The valve cover assembly includes a lower cover 210, a middle cover 220, and an upper cover 230, which are arranged in sequence. The lower cover 210 is mounted on the valve cover seat 120, the upper middle cover 220 is mounted on the lower cover 210, and the upper cover 230 is mounted on the middle cover 220. The rod channel is formed into corresponding sections on the lower cover 210, the middle cover 220, and the upper cover 230. A supporting ring 221 is provided on the inner wall of the middle cover 220. The bottom of the rod channel at the position of the lower cover 210 is a small diameter section 211, which is matched with the valve stem 310 through the small diameter section 211. The area above the small diameter section 211 corresponding to the rod channel is the funnel section 212.

[0040] The valve stem 300 is mounted on the upper cover 230. The operating structure of the valve stem 300 is not important; it could be a handwheel, for example. The valve stem 300 includes a valve stem 310 that passes through the upper cover 230, the middle cover 220, and the lower cover 210, and is arranged to open and close with the valve seat 110. A valve flap 320 is mounted on the inner end of the valve stem 310. As the valve stem 310 is raised or lowered in height, the valve flap 320 opens and closes with the valve seat 110. The diameter of the valve stem 310 matches the inner diameter of the small-diameter section 211, forming a guide and seal at this location.

[0041] The bellows assembly includes an upper retaining ring 410, a bellows 420, and a lower retaining head 430, which are sequentially connected from top to bottom. The retaining ring, bellows 420, and lower retaining head 430 can be connected by welding, for example. The upper retaining ring 410 is clamped between the upper cover 230 and the middle cover 220, providing both fixation and a seal. The bellows 420 is disposed within the valve cover assembly, and the lower retaining head 430 is sleeved and secured to the valve stem 310. The lower retaining head 430 can be secured to the valve stem 310 by welding, for example. The bottom of the lower retaining head 430 is a tapered portion 431 corresponding to the funnel section 212.

[0042] When the valve stem 300 is in the downward position, the entire stop valve is closed, and downstream pressure acts on the valve body 100. At this time, the lower fixing head 430 forms a seal with the funnel section 212 of the lower cover 210, preventing the conductive medium from entering the bellows assembly. The tapered portion 431 of the lower fixing head 430 and the funnel section 212 of the lower cover 210 form an excellent seal, and the slope of the funnel section 212 also facilitates the downward discharge of impurities.

[0043] When the valve stem 300 is in the upper position, the entire stop valve is conducted, the upstream pressure acts on the valve body 100, and a seal is formed between the lower fixing head 430 and the abutting ring 221, so that the conducting medium does not enter the bellows 420.

[0044] In summary, the inner wall of the middle cover 220 is provided with a supporting ring 221, the lower cover 210 is provided with a funnel section 212, and the bottom of the lower fixed head 430 of the bellows assembly is a conical portion 431 corresponding to the funnel section 212; the sealing effect formed by the conical portion 431 of the lower fixed head 430 and the funnel section 212 of the lower cover 210 is excellent, and the slope of the funnel section 212 also facilitates the discharge of impurities; when the valve stem portion 300 is at the bottom, the lower fixed head 430 forms a seal with the funnel section 212 of the lower cover 210, and the conductive medium will not enter the bellows assembly; when the valve stem portion 300 is at the top, a seal is formed between the lower fixed head 430 and the supporting ring 221, and the conductive medium will not enter the bellows 420.

[0045] In one embodiment, the lower fixing head 430 includes conical lower fixing petals that occupy 180 degrees in the circumferential direction, and the two conical lower fixing petals are engaged and fixed to the valve stem 310 .

[0046] In this embodiment, the lower fixing head 430 is fixed to the valve stem 310 in a mechanical manner, which is simple and convenient while reducing the difficulty of maintenance. For example, the two conical lower fixing petals are fixed by multiple bolts, and in this process, the two conical lower fixing petals also embrace and fix the valve stem 310. In order to improve the fixing and sealing effect between the lower fixing head 430 and the valve stem 310, a conical surface fit and other forms can be set between the two. In particular, the bottom of the lower fixing head 430 is a conical portion 431 corresponding to the funnel section 212. Then, when the two are combined, the sealing effect between the two conical lower fixing petals is further improved. After the lower fixing head 430 is installed, the bellows 420 can be welded to the lower fixing head 430.

[0047] In one embodiment, an annular groove is provided on the valve stem 310 at a position corresponding to the lower fixed head 430 , and a fixing ring is provided on the lower fixed head 430 corresponding to the annular groove.

[0048] In this embodiment, the lower fixing head 430 is a split structure, which provides a basis for the introduction of the ring groove and the fixing ring. Due to the cooperation between the ring groove and the fixing ring, the fixing stability of the lower fixing head 430 on the valve stem 310 is improved.

[0049] In one embodiment, the lower fixing head 430 forms a seal with the inner wall of the rod channel within the lifting range.

[0050] In this embodiment, when the sealing effect between the lower fixed head 430 and the rod channel is excellent, the conductive medium will not enter the position of the bellows 420. After the sealing effect between the lower fixed head 430 and the rod channel decreases, the gap between the two is still small, and impurities in the conductive medium are not easy to enter the position of the bellows 420.

[0051] Reference Figure 1 In one embodiment, the middle cover 220 and the lower cover 210 are connected to the valve cover seat 120 by a set of bolts.

[0052] In this embodiment, the fixing method of the middle cover 220 and the lower cover 210 is optimized, for example, four sets of bolts are passed through the middle cover 220 and the lower cover 210 and then connected to the valve cover seat 120. The above bolt connection method has the advantages of stability and easy maintenance.

[0053] Reference Figure 6 In one embodiment, a stuffing cavity 231 is provided on the inner periphery of the top of the upper cover 230 , and a stuffing cover is provided on the upper cover 230 corresponding to the stuffing cavity 231 .

[0054] In this embodiment, a packing cavity 231 for installing packing is provided at the location where the upper cover 230 mates with the valve stem 310. A packing cap is then provided on the upper cover 230. The packing cap secures the packing, improving the sealing effect at this location. The packing cap can be secured to the upper cover 230 using, for example, a threaded connection.

[0055] In one embodiment, the upper fixing ring 410 , the bellows 420 and the lower fixing head 430 are connected by welding.

[0056] In this embodiment, the connection between the upper fixing ring 410, the bellows 420 and the lower fixing head 430 is limited to welding, which has the advantages of stability and simple implementation. In particular, the advantages of welding are more obvious under relatively harsh working conditions.

[0057] In one embodiment, a sealing ring is stacked corresponding to the upper fixing ring 410 .

[0058] In this embodiment, the introduction of a sealing ring enhances the sealing effect at the location of the upper retaining ring 410. During installation, the upper cover 230 and the middle cover 220 jointly clamp the upper retaining ring 410 and the sealing ring. The sealing ring can be made of inorganic (such as graphite), organic (such as polyurethane), or metal (such as copper), depending on the actual use scenario.

[0059] In one embodiment, a sealing ring is provided between the lower cover 210 and the valve cover seat 120 , a sealing ring is provided between the middle cover 220 and the lower cover 210 , and a sealing ring is provided between the upper cover 230 and the middle cover 220 .

[0060] In this embodiment, the introduction of sealing rings enhances the sealing effect at various locations. The sealing rings are secured by clamping. The sealing rings can be made of inorganic (e.g., graphite), organic (e.g., polyurethane), or metal (e.g., copper), depending on the specific application scenario.

[0061] Reference Figure 1 In one embodiment, the middle cover 220 and the upper cover 230 are connected by a set of bolts.

[0062] In this embodiment, the fixing method of the upper cover 230 and the middle cover 220 is optimized. For example, four sets of bolts are passed through the middle cover 220 and the upper cover 230 to complete the fixing. The above bolt connection method has the advantages of stability and easy maintenance.

[0063] To sum up, in the high-pressure bellows stop valve provided by the present invention, the inner wall of the middle cover 220 is provided with a supporting ring 221, the lower cover 210 is provided with a funnel section 212, and the bottom of the lower fixed head 430 of the bellows assembly is a conical portion 431 corresponding to the funnel section 212; the sealing effect formed by the conical portion 431 of the lower fixed head 430 and the funnel section 212 of the lower cover 210 is excellent, and the slope of the funnel section 212 also facilitates the downward discharge of impurities; when the valve stem portion 300 is at the bottom, the lower fixed head 430 forms a seal with the funnel section 212 of the lower cover 210, and the conductive medium will not enter the bellows assembly; when the valve stem portion 300 is at the top, a seal is formed between the lower fixed head 430 and the supporting ring 221, and the conductive medium will not enter the bellows 420.

[0064] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A high-pressure bellows stop valve, characterized in that: include: A valve body (100) is provided with a valve seat (110) inside and a valve cover seat (120) is provided on the outer wall corresponding to the valve seat (110); A valve cover assembly, wherein a rod passage passes through the middle thereof, the valve cover assembly comprising a lower cover (210) mounted on the valve cover seat (120), a middle cover (220) mounted on the lower cover (210), and an upper cover (230) mounted on the middle cover (220), wherein an abutting ring (221) is provided on the inner wall of the middle cover (220), wherein the rod passage has a small diameter section (211) at the bottom end at the position of the lower cover (210), and a funnel section (212) is provided above the small diameter section (211); a valve stem portion (300) mounted on the upper cover (230), the valve stem portion (300) comprising a valve stem (310) passing through the upper cover (230), the middle cover (220) and the lower cover (210) and arranged to be separated and connected with the valve seat (110), a valve flap (320) being mounted on the inner end of the valve stem (310), and a diameter of the valve stem (310) being consistent with an inner diameter of the small diameter section (211); A bellows assembly comprises an upper fixing ring (410), a bellows (420), and a lower fixing head (430) connected in sequence from top to bottom, wherein the upper fixing ring (410) is clamped between the upper cover (230) and the middle cover (220), the bellows (420) is disposed in the valve cover assembly, and the lower fixing head (430) is sleeved and fixed to the valve stem (310), and the bottom thereof is a tapered portion (431) corresponding to the funnel section (212); When the valve stem portion (300) is in an upper position, a seal is formed between the lower fixed head (430) and the supporting ring (221).

2. The high-pressure bellows stop valve according to claim 1, characterized in that: The lower fixing head (430) comprises conical lower fixing petals each occupying 180 degrees in the circumferential direction, and the two conical lower fixing petals are engaged and fixed to the valve stem (310).

3. The high-pressure bellows stop valve according to claim 2, characterized in that: An annular groove is provided on the valve stem (310) at a position corresponding to the lower fixed head (430), and a fixing ring is provided on the lower fixed head (430) corresponding to the annular groove.

4. The high-pressure bellows stop valve according to any one of claims 1 to 3, characterized in that: The lower fixed head (430) forms a seal with the inner wall of the rod channel within the lifting range.

5. The high-pressure bellows stop valve according to any one of claims 1 to 3, characterized in that: The middle cover (220) and the lower cover (210) are connected to the valve cover seat (120) via a set of bolts.

6. The high-pressure bellows stop valve according to any one of claims 1 to 3, characterized in that: A stuffing cavity (231) is provided on the inner periphery of the top end of the upper cover (230), and a stuffing cover is provided on the upper cover (230) corresponding to the stuffing cavity (231).

7. The high-pressure bellows stop valve according to any one of claims 1 to 3, characterized in that: The connection between the upper fixing ring (410), the bellows (420) and the lower fixing head (430) is achieved by welding.

8. The high-pressure bellows stop valve according to any one of claims 1 to 3, characterized in that: A sealing ring is stacked corresponding to the upper fixing ring (410).

9. The high-pressure bellows stop valve according to any one of claims 1 to 3, characterized in that: A sealing ring is provided between the lower cover (210) and the valve cover seat (120), a sealing ring is provided between the middle cover (220) and the lower cover (210), and a sealing ring is provided between the upper cover (230) and the middle cover (220).

10. The high-pressure bellows stop valve according to any one of claims 1 to 3, characterized in that: The middle cover (220) and the upper cover (230) are connected via a set of bolts.

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