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

Abstract

The utility model discloses a special sea water desalination plug valve with an on-line corrugated pipe ejection plug cock mechanism, which relates to the technical field of valves and 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 bushing 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 utility model relates to the technical field of valves, in particular to a special plug valve for seawater desalination with an online bellows ejection plug mechanism. Background Art

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

[0003] In the RO membrane desalination process, separate piping is generally used, with each pipeline equipped with a complete valve system. To ensure that problems with a single pipeline do not affect the operation of other pipelines, a backup valve system is also provided. Adopting the "one in use, one in reserve" piping design concept, the backup plug valve is normally closed and only opened when the pipeline needs flushing. Due to the long-term non-operation of the soft-seal plug valve, the plug and bushing can become stuck, making the valve unable to open or close.

[0004] Currently, most plug valve suppliers on the market use traditional plug valve structures. Once a valve becomes stuck and cannot be opened or closed, it must be returned to the manufacturer for repair. Most plug valves used in desalination processes have welded connections. When repairs are needed, the valve must be cut from the pipeline and sent back to the valve manufacturer for repair. After the valve manufacturer completes the repair, it is sent back to the user, who then welds it back to the pipeline. This process is extremely time-consuming. Generally, desalination equipment cannot tolerate downtime exceeding three days for maintenance.

[0005] Currently, plug valves used in seawater desalination plants on the market are not designed for online maintenance. When a plug becomes stuck and the valve cannot be opened or closed, it must be returned to the factory for repair. Spare plug valves are often closed and only open to flush the pipeline. The plug valve bushing is made of PTFE, and the plug is made of duplex steel. Long periods of inactivity can cause the PTFE bushing to "lock" with the plug, preventing the plug valve from opening. In this situation, the valve can only be replaced or repaired. This creates a significant challenge to maintaining a stable water supply during downtime to replace the valve. Utility Model Content

[0006] Purpose of the utility model: The technical problem to be solved by the utility model 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] In order to solve the above problems, the technical solution provided by the present invention is as follows:

[0009] A special plug valve for seawater desalination with an online bellows ejection plug mechanism comprises a valve body, a valve cover installed on the top of the valve body and a plug installed in the valve body. A bushing is provided on the outside of the plug, and an 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, and the ejection screw is rotatably arranged in the bellows lower seat.

[0010] Furthermore, a sealing ridge is provided in the valve body, an anti-rotation rib protruding from the sealing ridge 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, a spherical protrusion is provided on the upper seat of the bellows.

[0012] 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.

[0013] Furthermore, a guide protrusion is provided at the bottom of the tap.

[0014] 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.

[0015] Furthermore, a sealing gasket is provided between the valve cover and the valve body.

[0016] Furthermore, a gasket cover is provided on the lower side of the valve cover, and an adjusting screw abutting against the gasket cover is provided inside the valve cover.

[0017] Furthermore, the ejection screw and the adjustment screw are both ball head structures.

[0018] Furthermore, 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.

[0019] Beneficial effects

[0020] Compared with the prior art, the technical solution provided by this utility model has the following beneficial effects:

[0021] The technical solution provided by the utility model can be repaired without disassembling the valve, which saves production time for valve users. The structural design has a bellows ejection plug mechanism, and the bellows structure solves the problem of medium leakage, and improves the safety and reliability of the structure. The bellows acts as an elastic element and can be stretched and compressed. When the medium flows normally, the bellows acts as a sealing element to avoid medium leakage, and improves the safety and reliability of this 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

[0022] Figure 1 This is a schematic structural diagram of Example 1 of the present utility model;

[0023] Figure 2 For the utility model embodiment 1 Figure 1 A magnified schematic diagram of point A in the middle;

[0024] Figure 3 This is a schematic diagram of the interior of the valve body of Example 1 of the present utility model without the bushing installed;

[0025] Figure 4 This is a schematic diagram of the interior of the valve body installation sleeve of Example 1 of the present utility model. DETAILED DESCRIPTION

[0026] 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.

[0027] Example 1

[0028] Combined with attachment Figure 1-4 A special plug valve for seawater desalination with an online bellows ejection plug mechanism is suitable for working conditions such as seawater pipelines with a diameter range of ≤500mm, a pressure range of ≤10.0MPa, and a temperature of ≤100℃. It includes 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.

[0029] The valve body 5 is provided with an opening running through the upper and lower parts for installing the cock 6.

[0030] A sealing ridge 30 is provided on the wall of the valve body 5 at a position for installing the plug 6 within the spatial position for the flow medium in the valve body 5. An anti-rotation rib 31 is provided on the wall of the valve body 5 and is located between the sealing ridges 30 and protrudes from the sealing ridges 30. The anti-rotation rib 31 is directly protruded from the wall of the valve body 5. An opening for protruding the anti-rotation rib 31 is provided on the powder ridge 30, and the flip-in 31 passes through the opening of the sealing ridge 30 and protrudes from the wall surface of the space inside the valve body 5.

[0031] Since the plug 6 needs to be used outside the valve body 5 to surround the bushing 32, 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. A groove is provided on the bushing 32 to cooperate 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.

[0032] 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 plug 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.

[0033] The plug 6 and the bottom structure of the bushing 32 surrounding the plug 6 are inserted into the local mounting groove 40 at the bottom of the valve body 5. The local mounting 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 mounting groove 40, so that the guide protrusion 601 can be directly inserted into the local mounting groove 40 to ensure that the plug 6 is correctly installed in the valve body 5.

[0034] The top of the valve body 5 is a direct opening structure, which is convenient for the entry of the plug 6. 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. The guide sleeve 3 plays an auxiliary installation and sealing role.

[0035] A ejection space 41 communicating with the local mounting groove 40 is provided on 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 first threadedly connected and then sealed and welded 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, and the spherical protrusion of the bellows upper seat 33 abuts against the guide protrusion 601 of the plug 6, forming point contact with the end face of the guide protrusion 601 of the plug 6, avoiding the large contact area causing the plug and the bellows assembly to contact and produce adhesion.

[0036] 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. The ejector screw 36 pushes the bellows upper seat 33 upward by moving upward, so that the bellows upper seat 33 moves upward and pushes the plug 6 as a whole to move upward, thereby facilitating the removal of the plug 6.

[0037] By installing 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.

[0038] The outer circle of the upper side of the bellows upper seat 33 fits within the inner hole of the valve body 5 and the ejection space 41, and the bellows upper seat 33 slides and rises within 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 evenly applied when the plug 6 is ejected, avoiding damage to the bushing.

[0039] 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 into the valve body 5, the plug 6 and the bushing 32 on the plug 6 are 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 to which the plug 6 needs to be lifted can be calculated to completely separate from the bushing 32.

[0040] Taking the DN300 CL600 plug valve as an example, the design calculations determined that the interference fit between the bushing and the plug is 0.5mm, and the single-sided taper angle of the plug is 2°. This indicates that the plug 6 needs to be lifted approximately 7.2mm to completely disengage from the bushing 32. Based on the displacement of a single corrugation of the bellows, the total number of waves required to lift the bellows approximately 7.2mm is calculated. During the design, it was determined that the maximum distance between the bellows upper seat 33 of the bellows assembly and the ejection space 41 or the local mounting groove 40 is 7.2mm, meaning that the bellows upper seat 33 requires a 7.2mm lift. Once the plug 6 is ejected, the actuator can rotate the valve without rotating the ejection screw 36.

[0041] The bellows 33 is used to play a sealing role. When the plug 6 needs to be removed, 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.

[0042] 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 that abuts against the sealing gasket 7 on 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 press the gasket pressure cover 8 down on the plug 6 by rotating the adjusting screw 10.

[0043] The valve cover 9 is designed with a ring of adjusting screws. When the bushing 32 wears, tightening the adjusting screws 10 pushes the tapered plug 6 downward, restoring the valve seal and significantly extending the service life of the plug valve. The adjusting screws 10 feature a ball-end structure, which prevents uneven force when tightening the gasket gland 8. The threads of the adjusting screws 10 are fine-threaded, reducing the pitch and enhancing their self-locking properties. This prevents loosening during pre-tightening and improves their reliability.

[0044] 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 on the top of the bracket 14. A handwheel can be provided on the turbine actuator 15, and the purpose of controlling the plug 6 is achieved by rotating the turbine actuator.

[0045] 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 cover 8, so that the force can be applied more evenly when moving.

[0046] When in use, the valve cover 9 is removed from the valve body 5, and the bellows upper seat 33 is pushed out by rotating the ejection screw 36. The bellows upper seat 33 is pushed upward and pushes the plug 6 to move upward as a whole, thereby separating the plug 6 from the bushing 32.

[0047] A knockout mechanism at the bottom of the plug valve prevents the PTFE material from hardening and causing the plug and bushing to become stuck due to prolonged non-operation. If the plug valve becomes stuck, the machine can be shut down for online repair, and the knockout mechanism can be used to eject the plug. Once reinstalled, the plug can be used again. This mechanism saves customers time in production, as replacement of welded-end valves can take longer.

[0048] A lifting ring 51 is provided on the top of the valve body 5 for assisting in moving the valve body, and a valve body support frame 52 is provided on the bottom of the valve body 5 for supporting the valve body.

[0049] The above-described embodiments merely represent several implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended 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 bushing is provided on the outside of the plug, a knockout space is provided at the bottom of the valve body, a bellows assembly is provided in the knockout 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, and the ejection screw is rotatably arranged in the bellows lower seat.

2. A special plug valve for seawater desalination with an online bellows ejection plug mechanism according to claim 1, characterized in that: A sealing ridge is provided in the valve body, an anti-rotation rib protruding from the sealing ridge 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.

3. The desalination-specific plug valve with an online bellows ejection plug mechanism according to claim 1 is characterized in that: A spherical protrusion is provided on the upper seat of the bellows.

4. 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.

5. The plug valve for seawater desalination with an online bellows ejection plug mechanism according to claim 1, characterized in that: A guide protrusion is provided at the bottom of the cock.

6. The seawater desalination special plug valve with an online bellows ejection plug mechanism according to claim 5, 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 shaft sleeve is provided in the local installation groove.

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

8. The seawater desalination special plug valve with an online bellows ejection plug mechanism according to claim 1, characterized in that: 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.

9. The seawater desalination special plug valve with an online bellows ejection plug mechanism according to claim 8, characterized in that: The ejection screw and the adjustment screw are both ball head structures.

10. The seawater desalination special plug valve with an online bellows ejection plug mechanism according to claim 1, 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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