Special seawater desalination plug valve with on-line corrugated pipe ejection plug mechanism

Abstract

The invention discloses a special sea water desalination plug valve with an online corrugated pipe ejection plug cock mechanism, and relates to the technical field of valves, the special sea water desalination plug valve comprises a valve body, a valve cover mounted at the top of the valve body and a plug cock mounted in the valve body, a lining is arranged on the outer side of the plug cock, an ejection space is arranged at the bottom of the valve body, and the corrugated pipe ejection plug cock mechanism is arranged in the ejection space. A corrugated pipe assembly is arranged in the ejection space, the corrugated pipe assembly is composed of a corrugated pipe upper seat, a corrugated pipe lower seat, a corrugated pipe and an ejection screw rod, the corrugated pipe is connected between the corrugated pipe upper seat and the corrugated pipe lower seat, and the ejection screw rod is rotationally arranged in the corrugated pipe lower seat; by the adoption of the corrugated pipe structure, the problem of medium leakage is solved, the safety and reliability of the structure are improved, the ejection screw is rotated, the ejection screw pushes the upper corrugated pipe base to eject the plug cock, at the moment, the corrugated pipe is in a stretched state, the sealing effect can be achieved, and meanwhile operation is easy and convenient.

Description

Technical Field

[0001] The invention relates to the technical field of valves, and in particular to a special plug valve for seawater desalination with an online bellows ejection plug mechanism. Background Art

[0002] In the seawater desalination process, butterfly valves are generally used as low-pressure valves, and plug valves are used as high-pressure valves. Plug valves play an indispensable role in the field of seawater desalination. Their unique performance and fully covered sealing surface make them one of the key valves in the field of seawater desalination.

[0003] In the RO membrane desalination process, a separate pipeline process is generally used. A pipeline is equipped with a complete valve system. At the same time, a spare pipeline valve system is equipped to ensure that the operation of other pipelines will not be affected when a problem occurs in a separate pipeline. The pipeline design concept of "one in use and one in reserve" is adopted. The spare plug valve is in a normally closed state and will only be opened when the pipeline needs to be flushed. Since the plug valve with a soft sealing structure has not been opened and closed for a long time, the plug and bushing are stuck, making the valve unable to be opened and closed.

[0004] At present, all plug valve suppliers on the market use traditional plug valve structures. Once the valve is stuck and cannot be opened or closed, the plug valve can only be returned to the factory for repair. Most of the plug valves used in the desalination process are connected by welding structures. When they need to be repaired, they can only be cut off from the pipeline and sent back to the valve manufacturer for repair. After the valve manufacturer completes the repair, it will be sent to the user, and the user will weld it to the pipeline. This time cycle will be very long. Generally, desalination equipment cannot accept shutdown maintenance plans of more than 3 days.

[0005] At present, the plug valves used in seawater desalination conditions on the market do not consider online maintenance. When the plug is stuck and the valve cannot be opened or closed, it can only be returned to the factory for repair. The spare plug valve is in a closed state for a long time and will only be opened when flushing the pipeline. The bushing material of the plug valve is PTFE, and the plug is made of duplex steel. The valve has not been opened or closed for a long time, resulting in the PTFE bushing and the plug being "locked", and the plug valve cannot be opened. When this happens, the valve can only be replaced or repaired. When the valve is shut down to replace the valve, it is a huge challenge to the stable water supply. Summary of the invention

[0006] Purpose of the invention: The technical problem to be solved by the present invention is to provide a special plug valve for seawater desalination with an online bellows ejection plug mechanism, which solves the problem that the plug and the bushing of the existing plug valve are stuck and cannot be removed online when the plug valve is not used during the repayment period.

[0007] Technical Solution

[0008] To solve the above problems, the technical solution provided by the present invention is:

[0009] A special stopcock valve for seawater desalination with an online bellows ejection stopcock mechanism comprises a valve body, a valve cover installed on the top of the valve body and a stopcock installed in the valve body, a bushing is provided on the outside of the stopcock, a ejection space is provided at the bottom of the valve body, a bellows assembly is provided in the ejection space, the bellows assembly consists of a bellows upper seat, a bellows lower seat, a bellows and an ejection screw, the bellows is connected between the bellows upper seat and the bellows lower seat, the ejection screw is rotatably arranged in the bellows lower seat, a spherical protrusion is provided on the bellows upper seat, and a guide protrusion is provided at the bottom of the stopcock.

[0010] Furthermore, a sealing edge is provided in the valve body, an anti-rotation rib protruding from the sealing edge is provided on the valve body wall, a groove is provided on the bushing to cooperate with the anti-rotation rib, and the ejector screw cooperates with the lower seat thread of the bellows.

[0011] Furthermore, the bellows welding seal is welded and fixed between the bellows upper seat and the bellows lower seat, and the bellows lower seat is welded and fixed on the inner wall of the ejection space.

[0012] Furthermore, the spherical protrusion abuts against the guide protrusion.

[0013] Furthermore, a local mounting groove cooperating with the guide protrusion is provided at the bottom of the valve body, and a guide sleeve is provided in the local mounting groove.

[0014] Furthermore, a sealing gasket is provided between the valve cover and the valve body.

[0015] Furthermore, a gasket gland is provided on the lower side of the valve cover, and an adjusting screw abutting against the gasket gland is provided inside the valve cover.

[0016] Furthermore, the ejector screw and the adjusting screw are both ball head structures.

[0017] Furthermore, the extension length of the bellows corresponds to the rising distance of the upper seat of the bellows when the plug is separated from the bushing.

[0018] Beneficial Effects

[0019] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0020] The technical solution provided by the present invention can be repaired without disassembling the valve, which saves production time for valve users. The present structure is designed with a bellows ejection plug mechanism, which adopts a bellows structure to solve the problem of medium leakage and improve the safety and reliability of the present structure. The bellows, as an elastic element, can be stretched and compressed. When the medium flows normally, the bellows, as a sealing element, avoids medium leakage and improves the safety and reliability of the present solution. When the plug and the bushing are "locked", remove all the adjustment screws on the valve cover and the valve cover, and then rotate the ejection screw. The ejection screw pushes the upper bellows seat to eject the plug. At this time, the bellows is in a stretched state, which can achieve the effect of separating the plug and the bushing, and the medium will not flow out from the bottom. At the same time, the operation is simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0022] Figure 2 For Example 1 of the present invention Figure 1 The enlarged schematic diagram of point A in the middle;

[0023] Figure 3 This is a schematic diagram of the interior of the valve body of Example 1 of the present invention without the bushing installed;

[0024] Figure 4 The figure is a schematic diagram of the interior of the valve body installation sleeve of Example 1 of the present invention. DETAILED DESCRIPTION

[0025] In order to make the technical solution of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Example 1

[0027] Combined with Figure 1-4 A special plug valve for seawater desalination with an online bellows ejection plug mechanism is suitable for seawater pipelines with a caliber range of ≤500mm, a pressure range of ≤10.0MPa, and a temperature of ≤100℃, etc., including a valve body 5 and a plug 6 installed in the valve body 5, and a valve cover 9 for fixing the plug 6 in the valve body 5.

[0028] The valve body 5 is provided with an opening which runs through from top to bottom and is used for installing the cock 6.

[0029] A sealing edge 30 is provided on the wall of the valve body 5 at a position for installing the plug 6 in a spatial position for the flowing medium in the valve body 5, and an anti-rotation rib 31 is provided on the wall of the valve body 5 and is located between the sealing edges 30 and protrudes from the sealing edges 30. The anti-rotation rib 31 is directly protruded from the wall of the valve body 5, and an opening for protruding the anti-rotation rib 31 is provided on the powder edge 30. The flip-in 31 passes through the opening of the sealing edge 30 and protrudes from the wall surface of the space inside the valve body 5.

[0030] Since the plug 6 needs to be used outside to surround the bushing 32 when used inside the valve body 5, the bushing 32 needs to be installed inside the valve body 5 before installing the plug 6. The bushing 32 and the sealing edge 30 have an interference fit, and the sealing is achieved through the interference fit and extrusion deformation, thereby forming a complete seal. The bushing 32 is provided with a groove that cooperates with the anti-rotation rib 31. The bushing 32 clamps the raised anti-rotation rib 31 to prevent the bushing from being displaced after the plug 6 is pressed in.

[0031] The bottom of the valve body 5 is provided with a protruding structure, and a local mounting groove 40 for mounting the bottom structure of the cock 6 is provided in the protruding structure at the bottom of the valve body 5. The local mounting groove 40 is communicated with the space for the flowing medium in the valve body 5.

[0032] The plug 6 and the bottom structure of the bushing 32 surrounding the plug 6 are inserted into the local installation groove 40 at the bottom of the valve body 5. The local installation groove 40 is a symmetrical stepped structure. A guide protrusion 601 for auxiliary installation is provided at the bottom of the plug 6. The guide protrusion 601 of the plug 6 is arranged corresponding to the local installation groove 40, so that the guide protrusion 601 can be directly inserted into the local installation groove 40 to ensure that the plug 6 is correctly installed in the valve body 5.

[0033] The top of the valve body 5 is a direct opening structure, which is convenient for the plug 6 to enter. At the same time, when the guide protrusion 601 of the plug 6 is installed in the local installation groove 40, a guide sleeve 3 is provided in the local installation groove 40. The guide sleeve 3 is installed on the surface of the guide protrusion 601 of the plug 6, and the guide sleeve 3 plays an auxiliary installation and sealing role.

[0034] A ejection space 41 communicating with the local mounting groove 40 is provided at the lower side of the local mounting groove 40 at the bottom of the valve body 5. A bellows assembly is provided in the ejection space 41. The bellows assembly consists of a bellows 35, a bellows upper seat 33, a bellows lower seat 34 and an ejection screw 36. The bellows upper seat 33 is slidably installed on the upper side of the ejection space 41, and the bellows lower seat 34 is installed on the lower side of the ejection space 41. The bellows lower seat 34 and the bottom wall of the ejection space 41 of the valve body 5 are firstly connected by threads and then fixed by sealing welding to prevent leakage of the medium. A bellows 35 is connected between the bellows upper seat 33 and the bellows lower seat 34, and the ejector screw 36 is rotatably set in the bellows lower seat 34. The bellows upper seat 33 is provided with a spherical protrusion, which abuts against the guide protrusion 601 of the plug 6 to form a point contact with the end face of the guide protrusion 601 of the plug 6, thereby avoiding adhesion between the plug and the bellows assembly due to a large contact area.

[0035] A bellows 35 is welded between the bellows upper seat 33 and the bellows lower seat 34, and the ejector screw 36 passes through the bellows lower seat 34 and abuts against the bottom surface of the bellows upper seat 33. The bellows lower seat 34 is provided with a thread that cooperates with the thread of the ejector screw 36. The ejector screw 36 moves upward in the bellows lower seat 34 by rotating, and the ejector screw 36 pushes the bellows upper seat 33 to move upward by moving upward, so that the bellows upper seat 33 moves upward and pushes the plug 6 to move upward as a whole, thereby facilitating the removal of the plug 6.

[0036] By arranging a bellows assembly with a bellows seal design in the ejection space 41, the medium is prevented from leaking out, ensuring that there is no leakage point at the bottom of the medium, which is safe and reliable. Preferably, the bellows upper seat 33 and the bellows lower seat 34 are both inner and outer circle structure steps, and the local installation groove 40 and the ejection space 41 are cylindrical spaces.

[0037] The outer circle of the upper side of the bellows upper seat 33 matches the inner hole of the valve body 5 and the ejection space 41, and the bellows upper seat 33 slides and rises in the valve body ejection space 41. The center of the bellows upper seat 33 and the center of the spherical protrusion coincide with the center of the plug 6, so that the force is more uniform when the plug 6 is ejected, avoiding damage to the bushing.

[0038] In actual production, the plug 6 and the bushing 32 on the plug 6 are both conical and have a certain inclination angle. When the plug 6 and the bushing 32 on the plug 6 are installed in the valve body 5, the plug 6 is wide at the top and narrow at the bottom. The size of the interference fit between the bushing 32 and the plug 6 is determined by calculation. According to the size of the interference fit and the taper of the conical plug 6, the height of the plug 6 to be lifted can be calculated to completely separate from the bushing 32.

[0039] Taking the DN300 CL600 plug valve as an example, the design calculation determines that the interference fit size between the bushing and the plug is 0.5mm, and the single-sided cone angle of the plug is 2°. It can be known that the plug 6 needs to be lifted by about 7.2mm to completely disengage from the bushing 32. According to the displacement of the single corrugation of the bellows, the total number of waves required to lift the bellows by about 7.2mm is calculated. During the design, it is determined that the maximum distance between the bellows upper seat 33 of the bellows assembly in the ejection space 41 or the local installation groove 40 is 7.2mm, that is, the bellows upper seat 33 needs to move 7.2mm to rise. When the plug 6 is ejected, the actuator can rotate the valve without rotating the ejection screw 36.

[0040] The bellows 33 is used to play a sealing role. When the plug 6 needs to be taken out, the medium in the valve body 5 will not flow out from the local installation groove 40 and the ejection space 41. The bellows 33 expands the entire bellows through the displacement of a single corrugation, thereby not only achieving the purpose of ejecting the plug 6, but also isolating the medium in the valve body 5 inside the valve body 5.

[0041] The valve cover 9 is connected to the valve body 5 after the plug 6 is installed in the valve body 5. The valve cover 9 is fixedly installed on the valve body 5 by bolts 12. The valve cover 9 and the valve body 5 are fixedly matched with bolts. A sealing gasket 7 is provided at the contact position between the valve cover 9 and the plug 6. The side of the valve cover 9 facing the sealing gasket 7 is provided with a gasket pressure cover 8 which is located on the sealing gasket 7 and abuts against the sealing gasket 7. An adjusting screw 10 located on the gasket pressure cover 8 is also provided in the valve cover 9. The adjusting screw 10 is threadedly matched with the valve cover 9. By rotating the adjusting screw 10, the adjusting screw 10 can be moved up and down in the valve cover 9. The adjusting screw 10 is a ball head structure. The ball head end of the adjusting screw 10 abuts against the gasket pressure cover 8. The worker can rotate the adjusting screw 10 to make the gasket pressure cover 8 press the plug 6 down.

[0042] The valve cover 9 is designed with a circle of adjusting screws. When the bushing 32 is worn, the adjusting screw 10 is pressed down to press the tapered plug 6, and the valve can be sealed again, which greatly improves the service life of the plug valve. The adjusting screw 10 adopts a ball head structure to avoid uneven force when the gasket gland 8 is pressed. When processing the thread of the adjusting screw 10, fine pitch thread is used to reduce the pitch, improve the self-locking performance of the adjusting screw, avoid looseness when the screw is pre-tightened, and improve the reliability of the adjusting screw.

[0043] A limit pin 11 is provided on the valve cover 9, and a bracket 14 is installed through the limit pin 11. A connecting sleeve 13 connected to the protruding end of the top of the plug 6 is provided in the bracket 14. The connecting sleeve 13 is provided with a turbine actuator 15 at the top of the bracket 14. A hand wheel can be provided on the turbine actuator 15. The purpose of controlling the plug 6 is achieved by rotating the turbine actuator.

[0044] The ends of the ejector screw 36 and the adjusting screw 10 are both ball head structures. The ejector screw 36 corresponds to the center of the bellows upper seat 33, and the adjusting screw 10 corresponds to the center of the gasket gland 8, so that the force can be applied more evenly when moving.

[0045] When in use, the valve cover 9 is removed from the valve body 5 , and the bellows upper seat 33 is ejected by rotating the ejection screw 36 . The bellows upper seat 33 is ejected and moves upward, pushing the plug 6 to move upward as a whole, thereby separating the plug 6 from the bushing 32 .

[0046] The related structure with ejection function set at the bottom of the plug valve can prevent the plug valve from not opening and closing for a long time, and the PTFE material hardens, causing the plug and bushing of the plug valve to get stuck, making the valve unable to move. When the plug valve is stuck, it can be stopped for online maintenance, and the plug can be ejected through the ejection structure. After reinstallation, the plug can be used again. For welding end valves, it takes a long time to replace the valve. The use of this structure has won more production time for customers.

[0047] A lifting ring 51 is provided at the top of the valve body 5 for assisting in moving the valve body, and a valve body support frame 52 is provided at the bottom of the valve body 5 for supporting the valve body.

[0048] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A special plug valve for seawater desalination with an online bellows ejection plug mechanism, characterized in that: It includes a valve body, a valve cover installed on the top of the valve body and a plug installed in the valve body, a sleeve is provided on the outside of the plug, an ejection space is provided at the bottom of the valve body, a bellows assembly is provided in the ejection space, the bellows assembly is composed of a bellows upper seat, a bellows lower seat, a bellows and an ejection screw, the bellows is connected between the bellows upper seat and the bellows lower seat, the ejection screw is rotatably arranged in the bellows lower seat, a spherical protrusion is provided on the bellows upper seat, and a guide protrusion is provided at the bottom of the plug.

2. The desalination-specific plug valve with an online bellows ejection plug mechanism according to claim 1 is characterized in that: A sealing edge is arranged in the valve body, an anti-rotation rib protruding from the sealing edge is arranged on the valve body wall, a groove is arranged on the bushing to cooperate with the anti-rotation rib, and the ejection screw cooperates with the lower seat thread of the bellows.

3. The desalination-specific plug valve with an online bellows ejection plug mechanism according to claim 1 is characterized in that: The bellows welding seal is welded and fixed between the bellows upper seat and the bellows lower seat, and the bellows lower seat is welded and fixed on the inner wall of the ejection space.

4. The desalination-specific plug valve with an online bellows ejection plug mechanism according to claim 1 is characterized in that: The spherical protrusion abuts against the guide protrusion.

5. The desalination-specific plug valve with an online bellows ejection plug mechanism according to claim 1 is characterized in that: The bottom of the valve body is provided with a local installation groove which is matched with the guide protrusion, and a guide sleeve is provided in the local installation groove.

6. The desalination-specific plug valve with an online bellows ejection plug mechanism according to claim 1 is characterized in that: A sealing gasket is provided between the valve cover and the valve body.

7. The desalination-specific plug valve with an online bellows ejection plug mechanism according to claim 1 is characterized in that: A gasket gland is provided at the lower side of the valve cover, and an adjusting screw abutting against the gasket gland is provided inside the valve cover.

8. The desalination-specific plug valve with an online bellows ejection plug mechanism according to claim 8, characterized in that: The ejector screw and the adjusting screw are both ball head structures.

9. The desalination-specific plug valve with an online bellows ejection plug mechanism according to claim 1 is characterized in that: The extended length of the bellows corresponds to the rising distance of the upper seat of the bellows when the cock is separated from the bushing.

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