Maintenance sealing structure for spherical valve and using method of maintenance sealing structure

Abstract

The invention discloses a maintenance sealing structure for a spherical valve and a using method of the maintenance sealing structure, and relates to the technical field of power station water inlet ball valve maintenance, in particular to the maintenance sealing structure for the spherical valve and the using method of the maintenance sealing structure for the spherical valve. A sliding groove matched with the overhaul sealing ring is formed in the valve body shell. The mechanical locking device is arranged on the valve body shell, one end of the mechanical locking device is connected with the overhaul sealing ring, the connecting face of the mechanical locking device and the overhaul sealing ring is arranged to be matched inclined faces, and when the mechanical locking device moves in the radial direction relative to the valve, the mechanical locking device has the advantages that the overhaul sealing ring can easily slide in the valve body due to the matched design of the overhaul sealing ring and the sliding groove; the sealing device is simple in structure and convenient to use, regular inspection and replacement are facilitated, the design of the whole system considers the requirement for efficient sealing, it is ensured that the good sealing effect can be kept under various working conditions, and meanwhile operators can conveniently conduct daily inspection and maintenance work.

Description

Technical Field

[0001] The invention relates to the technical field of maintenance of water inlet ball valves for power stations, and in particular to a maintenance sealing structure for ball valves and a use method thereof. Background Art

[0002] In the field of turbine sealing rings, the traditional locking method of the locking rod has certain limitations. For example, the diameter of the axial locking rod is limited and cannot be too large, otherwise it will cause installation difficulties or increase costs. In addition, this locking method is prone to problems such as jamming, bending or holding, which affects the sealing effect and the normal operation of the equipment.

[0003] The L-shaped split axial lock spindle commonly used in pumped storage units also has some problems. When the two wedge surfaces are disengaged, they are not easy to re-engage, which may cause water leakage problems, and it is not easy to maintain and replace. Especially for the axial small shaft, the replacement process is complicated and inconvenient. Summary of the invention

[0004] The present invention aims to overcome the above-mentioned shortcomings of the prior art and provides a maintenance seal structure for a spherical valve and a method of using the same.

[0005] The technical solution adopted by the present invention is as follows: A maintenance seal structure for a spherical valve, comprising: a mechanical locking device, a maintenance seal ring and a valve body shell, wherein the maintenance seal ring is arranged inside the valve body shell, and a slide groove matching the maintenance seal ring is arranged inside the valve body shell, so that the maintenance seal ring can slide along the axial direction of the valve; The mechanical locking device is arranged on the valve body shell, and one end is connected to the maintenance sealing ring. The connecting surface of the mechanical locking device and the maintenance sealing ring is set as a matching inclined surface. When the mechanical locking device moves radially relative to the valve, the maintenance sealing ring can slide axially in the slide groove.

[0006] Furthermore, the mechanical spindle locking device includes a plurality of spindles arranged in a circular array on the valve body shell.

[0007] Furthermore, an inclined groove is provided at the junction of the inspection sealing ring and the mechanical spindle locking device.

[0008] Furthermore, the mechanical locking device includes a sealing cap, a sleeve and a locking rod. The locking rod is slidably sleeved in the sleeve, a wedge-shaped lock head is provided at the locking end of the locking rod, and the sealing cap is detachably arranged at the end of the sleeve to limit the sliding of the locking rod.

[0009] Furthermore, the sleeve comprises an upper sleeve and a lower sleeve, and the upper sleeve and the lower sleeve are detachably connected.

[0010] Furthermore, the inner diameter of the upper sleeve matches the outer diameter of the locking rod, and the inner diameter of the lower sleeve is slightly larger than the inner diameter of the upper sleeve; the locking rod sleeve is provided with a limit block, and the outer diameter of the limit block matches the inner diameter of the lower sleeve.

[0011] Furthermore, a reinforcing retaining ring is provided at the connection between the upper sleeve and the lower sleeve; and matching directional grooves are provided on the sleeve wall and the locking rod.

[0012] Furthermore, the wedge-shaped lock head includes a limiting portion and a wedge-shaped portion, the outer diameter of the limiting portion matches the inner diameter of the sleeve; the cross-section of the wedge-shaped portion is set to a right-angle trapezoid, and the surface where the long hypotenuse of the trapezoid is located is connected to the maintenance sealing ring.

[0013] Furthermore, a method for using a maintenance sealing structure for a ball valve comprises the following steps: S1: The lower section of the fixed sleeve is sleeved on the valve body shell, and the locking rod is inserted into the lower sleeve so that the inclined surface of the locking rod is connected with the groove of the inclined surface of the inspection sealing ring; S2: Install the upper sleeve and fix the upper sleeve to the lower sleeve; S3: Install the sealing cap on the upper sleeve, push the locking rod downward, and the locking rod pushes the inspection sealing ring to move along the axial direction of the valve; S4: When the control needs to be manually released, remove the sealing cap and inspect the sealing ring under pressure to push the locking rod upward; S5: The limit block presses against the reinforcing retaining ring locking rod to stop the upward movement.

[0014] Furthermore, in step S1, when installing the locking rod, the locking rod and the directional groove of the sleeve are aligned, and the locking rod is inserted into the lower sleeve so that the inclined surface of the locking rod is connected with the inclined surface groove of the maintenance sealing ring.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: The use of a large diameter pin significantly improves the robustness and reliability of the seal structure. This design not only enhances the stability of the structure, but also reduces the risk of loosening due to vibration or pressure changes.

[0016] The locking rod is designed to be detachable, which is not only convenient for installation and replacement, but also can be quickly disassembled during maintenance, greatly saving maintenance costs and time.

[0017] The wedge-shaped design allows the inspection seal ring to be locked effectively, thus ensuring good sealing performance. This structure can also remain stable under high pressure to prevent leakage.

[0018] The matching design of the inspection seal ring and the slide groove enables it to slide easily in the valve body, which is convenient for regular inspection and replacement, thereby improving the maintainability of the system.

[0019] The design of the entire system takes into account the need for efficient sealing, ensuring good sealing effects under various working conditions, while also facilitating daily inspection and maintenance work by operators.

[0020] Compared with the traditional axial locking spindle, the locking spindle device of this design is less prone to water leakage, and the maintenance and replacement process is simpler, reducing the maintenance difficulty and cost.

[0021] Because the bevel design of the locking rod matches the bevel groove of the inspection seal ring, a secure connection can be maintained even under extreme working conditions, enhancing the safety of the system.

[0022] This structure is suitable for ball valves of different sizes and types, has strong versatility and adaptability, and can be widely used in various industrial scenarios.

[0023] The locking lever can be installed and removed in simple steps. The operation process is simple and intuitive, and even non-professionals can quickly master it. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 yes Figure 1 Schematic diagram of the cross-section structure at AA; Figure 3 yes Figure 2 The enlarged (unlocked) structural diagram at B, Figure 4 1 is a schematic diagram of the locking state structure of the present invention, Figure 5 It is a cross-sectional view of the sleeve.

[0025] Markings in the figure: 1-mechanical locking device, 101-sealing cap, 102-sleeve, 103-locking rod, 104-wedge-shaped lock head, 105-upper sleeve, 106-lower sleeve, 107-limiting block, 108-reinforcement retaining ring, 109-directional groove, 110-limiting part, 111-wedge-shaped part, 2-inspection sealing ring, 3-valve body shell, 201-bevel groove, 301-slide groove.

[0026] Specific Examples The present invention will be described in detail below in conjunction with the accompanying drawings.

[0027] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0028] In this embodiment, if Figure 1 , 2As shown, a maintenance seal structure for a ball valve includes: a mechanical locking device 1, a maintenance seal ring 2 and a valve body shell 3, wherein the maintenance seal ring 2 is arranged inside the valve body shell 3, and a slide groove 301 matching the maintenance seal ring 2 is arranged inside the valve body shell 3, so that the maintenance seal ring 2 can slide along the axial direction of the valve; The mechanical locking device 1 is arranged on the valve body shell 3, and one end is connected to the maintenance sealing ring 2. The connecting surface of the mechanical locking device 1 and the maintenance sealing ring 2 is set to a matching inclined surface. When the mechanical locking device 1 moves radially relative to the valve, the maintenance sealing ring 2 can slide axially in the slide groove 301.

[0029] At present, the main water inlet valve maintenance seal of the hydropower station is equipped with a mechanical lock device 1. When the unit is overhauled, after the main water inlet valve maintenance seal is put into operation, the sealed lock device must be fully put into operation to ensure that the main water inlet valve can reliably cut off the upstream water source. Before the main water inlet valve maintenance seal is withdrawn after the unit maintenance is completed, the mechanical lock must be fully withdrawn. This makes the maintenance steps too cumbersome and prone to safety accidents; In this embodiment, the inspection seal ring 2 is one of the core components, and its design allows sliding in the valve body housing 3. This sliding feature ensures that the seal ring can be easily moved when necessary for inspection or replacement.

[0030] The sealing ring is provided with inclined grooves 201 , which cooperate with the wedge-shaped lock head 104 on the locking rod 103 to form a stable mechanical connection and ensure the sealing effect.

[0031] During maintenance work, the mechanical locking device 1 is tightened toward the axial direction of the valve, and the radial force is transmitted to the axial direction through the inclined surface. The maintenance sealing ring 2 slides along the axial direction of the valve, and the maintenance sealing ring 2 is pushed to move along the axial direction of the valve body to the sealing working position to achieve manual sealing; when the maintenance state is released, the mechanical locking device 1 is screwed outward, the maintenance sealing ring 2 slides along the axial direction of the valve, and moves in the axial direction under the action of the valve pressure, and simultaneously pushes the mechanical locking device 1 away from the axial direction to achieve the unlocking function.

[0032] Furthermore, the mechanical spindle locking device 1 includes a plurality of spindles arranged in a circular array on the valve body housing 3 .

[0033] Multiple mechanical locking devices 1 are arranged in a circular array on the valve body housing 3, which can evenly distribute the force and ensure the stability and reliability of the sealing ring. This design helps to improve the firmness and reliability of the entire system and reduce the risk of loosening due to vibration or pressure changes.

[0034] Furthermore, an inclined groove 201 is provided at the junction of the inspection sealing ring 2 and the mechanical spindle locking device 1 .

[0035] The maintenance seal ring 2 is provided with an inclined groove 201 at the junction with the mechanical lock device 1. Such a design facilitates a close fit between the two and improves the sealing effect. The design of the inclined groove 201 enables the maintenance seal ring 2 to be effectively locked, thereby ensuring good sealing performance at a position where the mechanical lock device 1 is not inserted.

[0036] Furthermore, the mechanical locking device 1 includes a sealing cap 101, a sleeve 102 and a locking rod 103. The locking rod 103 is slidably sleeved in the sleeve 102. A wedge-shaped lock head 104 is provided at the locking end of the locking rod 103. The sealing cap 101 is detachably arranged at the end of the sleeve 102 to limit the sliding of the locking rod 103.

[0037] The mechanical ingot locking device 1 comprises a sealing cap 101, a sleeve 102 and a locking rod 103. The locking rod 103 is slidably sleeved in the sleeve 102, and a wedge-shaped lock head 104 is provided at the locking end of the locking rod 103. The sealing cap 101 is detachably provided at the end of the sleeve 102 to limit the sliding of the locking rod 103. This design allows the locking rod 103 to slide stably in the sleeve 102, which is convenient for regular inspection and replacement, thereby improving the maintainability of the system.

[0038] Furthermore, the sleeve 102 includes an upper sleeve 105 and a lower sleeve 106, and the upper sleeve 105 and the lower sleeve 106 are detachably connected.

[0039] Furthermore, the inner diameter of the upper sleeve 105 matches the outer diameter of the locking rod 103, and the inner diameter of the lower sleeve 106 is slightly larger than the inner diameter of the upper sleeve 105; the locking rod 103 is sleeved with a limit block 107, and the outer diameter of the limit block 107 matches the inner diameter of the lower sleeve 106.

[0040] The sleeve 102 is divided into an upper sleeve 105 and a lower sleeve 106, which are detachably connected. The inner diameter of the upper sleeve 105 matches the outer diameter of the locking rod 103, while the inner diameter of the lower sleeve 106 is slightly larger than the inner diameter of the upper sleeve 105. The locking rod 103 is provided with a limit block 107, and the outer diameter of the limit block 107 matches the inner diameter of the lower sleeve 106. This design helps the locking rod 103 to slide stably in the sleeve 102. This design is not only convenient for installation and disassembly, but also helps to improve the firmness and reliability of the entire system; Furthermore, a reinforcing retaining ring 108 is provided at the connection between the upper sleeve 105 and the lower sleeve 106 ; and matching directional grooves 109 are provided on the inner wall of the sleeve 102 and the locking rod 103 .

[0041] A reinforcing ring 108 is provided at the connection between the upper sleeve 105 and the lower sleeve 106, which can enhance the strength of the connection between the two and prevent loosening or falling off during use. The provision of the reinforcing ring 108 helps to improve the firmness and reliability of the entire system and reduce the risk of loosening due to vibration or pressure changes.

[0042] In this embodiment, the directional groove 109 is arranged on the inner wall of the sleeve 102 and is arranged as a straight groove. A protrusion is arranged on the side wall of the locking rod 103. When the locking rod 103 moves downward, it can slide along the groove without relative rotation, ensuring that the inclined surfaces of the locking rod 103 correspond to each other after it is in place, thereby realizing the conversion of radial and axial direction forces.

[0043] Furthermore, the wedge-shaped locking head 104 includes a limiting portion 110 and a wedge-shaped portion 111 , the outer diameter of the limiting portion 110 matches the inner diameter of the sleeve 102 ; the cross section of the wedge-shaped portion 111 is set to a right-angled trapezoid, and the surface where the long hypotenuse of the trapezoid is located is connected to the maintenance sealing ring 2 .

[0044] The wedge-shaped lock head includes a limit portion 110 and a wedge-shaped portion 111. The outer diameter of the limit portion 110 matches the inner diameter of the sleeve 102, and the cross section of the wedge-shaped portion 111 is set to a right-angled trapezoid, and the surface where the long hypotenuse of the trapezoid is located is connected to the maintenance sealing ring 2. Such a design helps the wedge-shaped lock head 104 to better cooperate with the maintenance sealing ring 2 to achieve effective sealing. The design of the wedge-shaped lock head 104 enables the maintenance sealing ring 2 to be effectively locked, thereby ensuring good sealing performance.

[0045] Furthermore, a method for using a maintenance sealing structure for a ball valve comprises the following steps: S1: Fix the lower sleeve 106 of the sleeve 102 on the valve body housing 3, insert the locking rod 103 into the lower sleeve 106, so that the inclined surface of the locking rod 103 is connected with the inclined surface groove 201 of the inspection sealing ring 2; S2: Install the upper sleeve 105 and fix the upper sleeve 105 and the lower sleeve 106; S3: Install the sealing cap 101 on the upper sleeve 105, push the locking rod 103 downward, and the locking rod 103 pushes the inspection sealing ring 2 to move along the axial direction of the valve; S4: When the control needs to be manually released, the sealing cap 101 is removed, and the sealing ring 2 is inspected under pressure to push the locking rod 103 upward; S5: The limiting block 107 presses against the reinforcing stop ring 108 to stop the locking rod 103 from moving upward.

[0046] The lower sleeve 106 of the sleeve 102 is fixed on the valve body shell 3, and the locking rod 103 is inserted so that its inclined surface is connected with the inclined groove 201 of the maintenance sealing ring 2; the upper sleeve 105 is installed and fixed with the lower sleeve 106; the sealing cap 101 is installed and the locking rod 103 is pushed downward to move the maintenance sealing ring 2; when the control needs to be manually released, the sealing cap 101 is removed and the maintenance sealing ring 2 pushes the locking rod 103 upward under pressure; finally, the limit block 107 is against the reinforcing retaining ring 108 to stop the locking rod 103 from moving upward. These steps ensure the smooth installation and use of the maintenance sealing structure. The installation and removal of the locking rod 103 can be completed through simple steps. The operation process is simple and intuitive, and even non-professionals can quickly master it.

[0047] Furthermore, in step S1, when installing the locking rod 103, the locking rod 103 and the directional groove 109 of the sleeve 102 are aligned, and the locking rod 103 is inserted into the lower sleeve 106 so that the inclined surface of the locking rod 103 is connected with the inclined surface groove 201 of the inspection sealing ring 2; In this embodiment, the directional groove 109 is arranged on the inner wall of the sleeve 102 and is arranged as a straight groove. A protrusion is arranged on the side wall of the locking rod 103. When the locking rod 103 moves downward, it can slide along the groove without relative rotation, ensuring that the inclined surfaces of the locking rod 103 correspond to each other after it is in place, thereby realizing the conversion of radial and axial direction forces.

[0048] The structure is suitable for ball valves of different sizes and types, has strong versatility and adaptability, and can be widely used in a variety of industrial scenarios. Whether it is a large or small ball valve, the number and size of the mechanical locking device 1 can be adjusted to meet different application requirements.

[0049] The installation and removal of the locking rod 103 can be completed through simple steps, and the operation process is simple and intuitive, and even non-professionals can quickly master it. This design greatly saves maintenance costs and time and improves work efficiency.

[0050] Due to its structural characteristics, the inspection seal structure has the ability to operate stably for a long time, reducing the need for frequent maintenance and extending the service life of the equipment. It can maintain a stable connection even under extreme working conditions, enhancing the safety of the system.

[0051] The above description is only a preferred embodiment of the invention and is not intended to limit the invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the invention should be included in the protection scope of the invention.

Claims

1. A maintenance seal structure for a ball valve, characterized in that: include: A mechanical locking device (1), a maintenance sealing ring (2) and a valve body shell (3), wherein the maintenance sealing ring (2) is arranged inside the valve body shell (3), and a sliding groove (301) matching the maintenance sealing ring (2) is arranged inside the valve body shell (3), so that the maintenance sealing ring (2) can slide along the axial direction of the valve; The mechanical locking device (1) is arranged on the valve body shell (3), and one end is connected to the maintenance sealing ring (2). The connecting surface of the mechanical locking device (1) and the maintenance sealing ring (2) is arranged as a matching inclined surface. When the mechanical locking device (1) moves radially relative to the valve, the maintenance sealing ring (2) can slide axially in the slide groove (301).

2. A maintenance seal structure for a ball valve according to claim 1, characterized in that: The mechanical spindle locking device (1) comprises a plurality of spindles which are arranged in a circular array on the valve body housing (3).

3. According to the inspection seal structure for a ball valve as described in claim 1, it is characterized in that: An inclined groove (201) is provided at the junction of the inspection seal ring (2) and the mechanical spindle locking device (1).

4. A maintenance seal structure for a ball valve according to claim 1, characterized in that: The mechanical ingot locking device (1) comprises a sealing cap (101), a sleeve (102) and a locking rod (103); the locking rod (103) is slidably sleeved in the sleeve (102); a wedge-shaped locking head (104) is provided at the locking end of the locking rod (103); the sealing cap (101) is detachably arranged at the end of the sleeve (102) for limiting the sliding of the locking rod (103).

5. A maintenance seal structure for a ball valve according to claim 4, characterized in that: The sleeve (102) comprises an upper sleeve (105) and a lower sleeve (106), and the upper sleeve (105) and the lower sleeve (106) are detachably connected.

6. A maintenance seal structure for a ball valve according to claim 5, characterized in that: The inner diameter of the upper sleeve (105) matches the outer diameter of the locking rod (103), and the inner diameter of the lower sleeve (106) is slightly larger than the inner diameter of the upper sleeve (105); the locking rod (103) is sleeved with a limit block (107), and the outer diameter of the limit block (107) matches the inner diameter of the lower sleeve (106).

7. A maintenance seal structure for a ball valve according to claim 4, characterized in that: A reinforcing retaining ring (108) is provided at the connection between the upper sleeve (105) and the lower sleeve (106); and matching directional grooves (109) are provided on the inner wall of the sleeve (102) and the locking rod (103).

8. A maintenance seal structure for a ball valve according to claim 4, characterized in that: The wedge-shaped lock head (104) comprises a limiting portion (110) and a wedge-shaped portion (111); the outer diameter of the limiting portion (110) matches the inner diameter of the sleeve (102); the cross section of the wedge-shaped portion (111) is arranged to be a right-angled trapezoid, and the surface where the long hypotenuse of the trapezoid is located is connected to the maintenance sealing ring (2).

9. A method for using a maintenance seal structure for a ball valve, applied to a maintenance seal structure for a ball valve according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1: The lower sleeve (106) of the fixing sleeve (102) is fixed on the valve body housing (3), and the locking rod (103) is inserted into the lower sleeve (106) so that the inclined surface of the locking rod (103) is connected with the inclined surface groove (201) of the inspection seal ring (2); S2: Install the upper sleeve (105) and fix the upper sleeve (105) and the lower sleeve (106); S3: Install the sealing cap (101) on the upper sleeve (105), push the locking rod (103) downward, and the locking rod (103) pushes the inspection sealing ring (2) to move along the axial direction of the valve; S4: When the control needs to be manually released, the sealing cap (101) is removed, and the sealing ring (2) is inspected under pressure to push the locking rod (103) upward; S5: The limit block (107) abuts against the reinforcing stop ring (108) and the locking rod (103) stops moving upward.

10. The method for using the maintenance seal structure for a ball valve according to claim 9, characterized in that: In the step S1, when installing the locking rod (103), the locking rod (103) and the orientation groove (109) of the sleeve (102) are aligned, and the locking rod (103) is inserted into the lower sleeve (106) so that the inclined surface of the locking rod (103) is connected with the inclined surface groove (201) of the inspection sealing ring (2).

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