Blind plate valve sealing structure

Abstract

The utility model relates to blind plate valve sealing technical field, concretely relates to a blind plate valve sealing structure. Include: sealing groove, for annular, set up on blind plate, and port direction the valve cover, flood plug ring, set up in sealing groove, top end and valve cover abut, bottom and sealing groove abut, and with sealing groove's outer end surface between have accommodating clearance, extension, for annular, set up in flood plug ring's outer end side, press ring, set up in accommodating clearance, with sealing groove's bottom end detachable connection, be suitable for with extension press solid in sealing groove. Through press ring, the extension of flood plug ring is detachably pressed solid in sealing groove, can prevent under the condition that blind plate frequently switches, medium pressure fluctuation or exists vibration, the risk that flood plug ring possibly occurs shift, loosening even is blown out by high pressure medium, has ensured the stability of sealing interface.

Description

Technical Field

[0001] This utility model relates to the field of blind valve sealing technology, and specifically to a blind valve sealing structure. Background Technology

[0002] The quick-change blind flange valve is a combination of a blind flange, valve body, release clamping mechanism and drive device. Its function is to switch the blind flange between open and blind working positions without removing the pipe flange connecting screws.

[0003] Currently, the sealing structure of quick-change blind valves involves placing the sealing ring, such as an O-ring, inside the sealing groove. This makes replacement inconvenient and unsuitable for high-pressure environments. Utility Model Content

[0004] In view of this, the present invention provides a blind valve sealing structure to solve the problems of existing sealing rings being inconvenient to replace and unsuitable for high-pressure environments.

[0005] This utility model provides a blind valve sealing structure, which is disposed on a blind plate between valve covers, including: The sealing groove is annular and is installed on the blind plate, with its port facing the valve cover; The plug ring is set in the sealing groove, with its top end abutting against the valve cover and its bottom end abutting against the sealing groove, and there is an accommodating gap between it and the outer end face of the sealing groove; The extension is annular and is disposed on the outer end side of the plug ring; A pressure ring, disposed within the receiving gap, is detachably connected to the bottom end of the sealing groove and is suitable for pressing the extension into the sealing groove; The sealing groove consists of two sets, which are respectively located on the outer edge of the blind plate through position and the outer edge of the blind plate blind position.

[0006] In this application, by providing a sealing groove to accommodate the plug ring, and with the clamping ring and extension engaging, the plug ring is more reliably secured, facilitating replacement. Furthermore, the plug ring's characteristics allow the sealing structure to operate in high-pressure environments. The clamping ring detachably presses the extension of the plug ring into the sealing groove, preventing displacement, loosening, or even being blown out by the high-pressure medium under conditions of frequent blind flange switching, media pressure fluctuations, or vibration, thus ensuring the stability of the sealing interface. The detachable connection of the clamping ring facilitates the inspection, maintenance, and replacement of the plug ring.

[0007] In one alternative embodiment, the opening of the plug ring faces the inside of the sealing groove; The extension is disposed on the outer end side of the ferrule.

[0008] In this application, when the system pressure increases, the medium pressure pushes the plug ring more tightly against the sealing surface of the valve cover, forming a self-sealing effect where the sealing specific pressure increases accordingly with the increase of system pressure. This not only reduces the excessive requirement for initial preload but also allows the plug ring to adapt to different working pressure conditions. Under high pressure, it achieves enhanced sealing by utilizing the medium pressure, thereby broadening the applicable pressure range of the valve, especially suitable for high-pressure environments.

[0009] In one alternative embodiment, a flow gap exists between the plug ring and the inner end face of the sealing groove.

[0010] In this application, a flow gap exists between the plug ring and the inner end face of the sealing groove, which optimizes pressure transmission and media flow environment. The flow gap provides a low-resistance channel for the media pressure inside the valve, allowing it to reach the plug ring area. When system pressure builds up, the pressure can act on the plug ring opening through the flow gap, causing the plug ring to fit tightly against the sealing surface of the valve cover.

[0011] In one alternative embodiment, the extension is located on the side of the sealing ring near the bottom end of the sealing groove and fits against the bottom end of the sealing groove.

[0012] In this application, the clamping force applied by the pressure ring can be transmitted to the sealing ring through the extension, ensuring that the sealing ring is firmly confined within the sealing groove and preventing axial movement or overturning under any operating conditions. The fit between the extension and the bottom end of the sealing groove provides a mounting reference surface for the sealing ring.

[0013] In one alternative embodiment, the inner end face of the pressure ring has a stepped structure and is adapted to the extension.

[0014] In this application, the stepped structure forms a limiting groove specifically designed to accommodate and hold the extension, allowing the pressure ring to simultaneously limit the extension in both radial and axial directions after installation, thus enhancing the stability of the plug ring fixation. The stepped mating surface increases the contact area, resulting in a more uniform distribution of clamping force.

[0015] In one alternative embodiment, the pressure ring does not protrude from the sealing groove.

[0016] In this application, the pressure ring does not protrude from the sealing groove, ensuring smooth and interference-free switching operation of the blind flange within the valve body. When the blind flange rotates or translates between the open and blind positions, if the pressure ring protrudes from the sealing groove on the blind flange surface, there is a risk of collision, scratching, or even mechanical interference with the valve body structure. This would not only hinder the normal operation of the blind flange but may also damage the pressure ring itself or the internal structure of the valve body. By completely housing the pressure ring within the cavity, the smoothness of the blind flange's outline is ensured, providing an unobstructed path for free switching of the blind flange.

[0017] In one alternative embodiment, the pressure ring is provided with a connecting hole, which is connected to a blind plate by a screw, and the screw is embedded in the pressure ring.

[0018] In this application, the screw head is embedded inside the pressure ring body to avoid protruding from the working surface of the pressure ring, thus ensuring the smoothness of the blind plate profile and achieving a detachable connection between the pressure ring and the blind plate. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model; Figure 2 This is a schematic diagram showing the location of the accommodating gap in an embodiment of the present utility model; Figure 3 This is a schematic diagram showing the position of the flow gap in an embodiment of this utility model; Figure 4 This is a schematic diagram of the structure of the ferrule in an embodiment of this utility model.

[0021] Explanation of reference numerals in the attached figures: 1. Sealing groove; 2. Blind flange; 3. Accommodation gap; 4. Extension; 5. Pressure ring; 6. Upper valve cover; 7. Lower valve cover; 8. Assembly gap; 9. Jacket; 10. Sealing lip; 11. Spring; 12. Opening; 13. Limiting block; 14. Flow gap; 15. Connecting hole; 16. Screw. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0023] A blind flange valve is a combination of a blind flange, valve body, release and clamping mechanism and drive device. Its function is to quickly switch the blind flange between open and blind working positions without removing the pipe flange connecting screws.

[0024] Currently, the most common sealing structure for quick-switching blind valves is the O-ring seal. O-ring seals offer advantages such as low cost, reliable sealing, and a wide range of material choices, but their resistance to chemical corrosion and aging is relatively poor. Therefore, in practical applications, quick-switching blind valves with O-ring seals have significant limitations.

[0025] The following is combined Figures 1 to 4 The following describes embodiments of the present invention.

[0026] According to embodiments of the present invention, such as Figures 1 to 3 As shown, a blind valve sealing structure is provided, which is disposed on a blind plate 2 between valve covers, including: The sealing groove 1 is annular and is provided on the blind plate 2, with its port facing the valve cover; A sealing ring is disposed within the sealing groove 1, with its top end abutting against the valve cover and its bottom end abutting against the sealing groove 1, and a receiving gap 3 between it and the outer end face of the sealing groove 1. In this embodiment, the top end of the sealing ring faces the valve cover, and the bottom end is away from the valve cover. The sealing ring can be a C-shaped ring, but this embodiment is not limited to this.

[0027] The extension 4 is annular and is disposed on the outer end side of the sealing ring; the extension 4 may be plate-shaped and disposed parallel to the bottom surface of the sealing groove 1.

[0028] A pressure ring 5 is disposed within the receiving gap 3 and is detachably connected to the bottom end of the sealing groove 1, suitable for pressing the extension 4 into the sealing groove 1; The sealing groove 1 consists of two sets, which are respectively located on the outer edge of the through position of the blind plate 2 and the outer edge of the blind position of the blind plate 2.

[0029] In this application, by providing a sealing groove 1 to accommodate the plug ring, and with the pressure ring 5 cooperating with the extension 4, the plug ring is more reliably fixed, facilitating replacement. Furthermore, the characteristics of the plug ring in this application allow the sealing structure to operate in high-pressure environments. The pressure ring 5 detachably presses the extension 4 of the plug ring into the sealing groove 1, preventing the plug ring from shifting, loosening, or even being blown out by the high-pressure medium under conditions of frequent blind flange 2 switching, medium pressure fluctuations, or vibration, thus ensuring the stability of the sealing interface. The detachable connection of the pressure ring 5 facilitates the inspection, maintenance, and replacement of the plug ring.

[0030] It should be noted that the valve cover may include an upper valve cover 6 and a lower valve cover 7, with a blind plate 2 located between the upper valve cover 6 and the lower valve cover 7. The pressure ring 5, the plug ring, and the sealing groove 1 form a sealing system. The blind plate 2 has a through hole at its through position, and the blind position of the blind plate 2 is a solid plate surface, which can block the passage of the valve cover. Each set of sealing grooves 1 can have two, respectively located on the upper and lower end faces of the blind plate 2, so that the plug rings in the sealing grooves 1 can respectively seal the space between the upper valve cover 6 and the blind plate 2, and between the lower valve cover 7 and the blind plate 2.

[0031] In one alternative implementation, such as Figure 3 As shown, there is an assembly gap 8 between the blind plate 2 located inside the sealing groove 1 and the cover plate. The sealing groove 1 can be connected to the valve cover channel through the assembly gap 8, so that the medium pressure inside the valve enters the sealing groove 1 area and acts on the plug ring.

[0032] In one alternative implementation, such as Figures 2 to 4 As shown, the ferrule includes: The jacket 9 is disposed in the sealing groove 1 and has an opening 12; the opening 12 of the jacket 9 on the plug ring faces the inside of the sealing groove 1.

[0033] The top end of the jacket 9 faces the valve cover, and the bottom end is away from the valve cover. A sealing lip 10 may be provided at the top of the jacket 9, located at the very top of the jacket 9, for abutting against the sealing surface of the valve cover. The bottom end may be a flat surface, directly abutting against the bottom end of the sealing groove 1.

[0034] A spring 11 is disposed within the opening 12 and is adapted to provide a spring force for the expansion of the opening 12 to the jacket 9, such that the top end of the jacket 9 abuts against the valve cover and the bottom end abuts against the sealing groove 1. It should be noted that both the sleeve 9 and the spring 11 are annular structures.

[0035] The jacket 9 can be an elastic element made of polymer material, and the spring 11 can be a metal spring 11, which has the characteristics of strong chemical corrosion resistance. Under extreme working conditions, its service life is longer than that of O-rings, and it is widely used in applications where rubber materials are not suitable.

[0036] The extension 4 is disposed on the outer end side of the plug ring, that is, on the outer end side of the sleeve 9.

[0037] In this application, the jacket 9, as the part in direct contact with the medium and the sealing surface, can be made of a chemically resistant and wear-resistant polymer material, providing good media compatibility and fit for the seal. The built-in spring 11 serves as an elastic power source, continuously providing outward expansion force to the jacket 9. This ensures that even under no-pressure or extremely low-pressure conditions, the jacket 9 can maintain an effective initial seal with the valve cover sealing surface under the preload force of the spring 11, avoiding potential leakage problems at zero pressure. When the system pressure increases, the medium pressure pushes the jacket 9 more tightly against the valve cover sealing surface, forming a self-sealing effect where the sealing specific pressure increases accordingly with the increase in system pressure. This not only reduces the excessive requirement for initial preload force but also allows the sealing ring to adapt to different working pressure conditions. At low pressure, it relies on the spring 11 to provide a basic seal, while at high pressure, it uses the medium pressure to achieve a strengthened seal, thereby broadening the applicable pressure range of the valve, especially suitable for high-pressure environments.

[0038] In one alternative implementation, such as Figure 4 As shown, the opening 12 is U-shaped, the spring 11 is V-shaped, and the bottom end of the spring 11 abuts against the bottom end of the opening 12. The two ends of the spring 11 abut against the two side walls of the opening 12, respectively.

[0039] In this application, the U-shaped opening 12 provides space for the V-shaped spring 11, allowing the elastic force of the spring 11 to act evenly on the two side walls of the jacket 9. This ensures that the sealing lip 10 at the top of the jacket 9 can open outwards evenly and contact the valve cover sealing surface, avoiding unilateral wear or localized sealing problems caused by uneven force. The two ends of the V-shaped spring 11 apply force directly to the side walls, converting the radial elastic force of the spring 11 into a stable supporting force for the sealing lip 10. Whether in static sealing or dynamic pressure changes, the uniformity of contact pressure is guaranteed, thereby improving the reliability and consistency of the seal.

[0040] In one alternative implementation, such as Figures 1 to 4 As shown, a limiting block 13 is provided at the port of the opening 12, which is suitable for limiting the end of the spring 11 so that the end of the spring 11 does not detach from the side wall of the opening 12.

[0041] In this application, a limiting block 13 is provided at the port of the opening 12 of the jacket 9 to constrain and position the spring 11, thereby ensuring the reliability and stability of the sealing ring. The limiting block 13 acts as a mechanical barrier to prevent the end of the spring 11 from slipping off the side wall of the jacket 9 it abuts against under long-term vibration, impact, or frequent pressure cycles. If the end of the spring 11 shifts, it will cause an imbalance in its supporting force on the side wall of the jacket 9, making it impossible for the sealing lip 10 to fit evenly against the sealing surface, thus leading to localized leakage or even complete seal failure.

[0042] In one alternative implementation, such as Figure 3 As shown, there is a flow gap 14 between the jacket 9 and the inner end face of the sealing groove 1.

[0043] In this application, a flow gap 14 is provided between the jacket 9 and the inner end face of the sealing groove 1 to optimize pressure transmission and media flow environment. The flow gap 14 provides a low-resistance channel for the media pressure inside the valve, enabling it to reach the jacket 9 area. When system pressure is built up, the pressure can act on the opening 12 of the jacket 9 through the flow gap 14, causing the jacket 9 to fit tightly against the sealing surface of the valve cover.

[0044] In one alternative embodiment, the extension 4 is located on the side of the sealing groove 1 near the bottom end of the sealing ring (i.e., on the jacket 9) and fits against the bottom end of the sealing groove 1.

[0045] In this application, the clamping force applied by the pressure ring 5 can be transmitted to the jacket 9 through the extension 4, ensuring that the jacket 9 is firmly confined within the sealing groove 1 and preventing axial movement or overturning under any operating conditions. The fit between the extension 4 and the bottom end of the sealing groove 1 provides an installation reference surface for the jacket 9, which helps ensure that the sealing lip 10 is in the correct working position after installation.

[0046] In one optional embodiment, the inner end face of the pressure ring 5 has a stepped structure and is adapted to the extension 4.

[0047] In this application, the stepped structure forms a limiting groove specifically for accommodating and locking the extension 4, allowing the pressure ring 5 to simultaneously limit the extension 4 in both radial and axial directions after installation, thereby enhancing the stability of the plug ring fixation. The stepped mating surface increases the contact area, resulting in a more uniform distribution of clamping force.

[0048] In an alternative embodiment, the pressure ring 5 does not protrude from the sealing groove 1.

[0049] In this application, the pressure ring 5 does not protrude from the sealing groove 1, ensuring smooth and interference-free switching operation of the blind flange 2 within the valve body. When the blind flange 2 rotates or translates between the open and blind positions, if the pressure ring 5 protrudes from the sealing groove 1 on the surface of the blind flange 2, there is a risk of collision, scratching, or even mechanical interference with the valve body structure. This would not only hinder the normal operation of the blind flange 2 but may also damage the pressure ring 5 itself or the interior of the valve body. By completely housing the pressure ring 5 within the cavity, the smoothness of the outer contour of the blind flange 2 is ensured, providing an unobstructed path for the free switching of the blind flange 2.

[0050] In one alternative implementation, such as Figure 3As shown, the pressure ring 5 is provided with a connecting hole 15, which is connected to the blind plate 2 by a screw 16, and the screw 16 is embedded in the pressure ring 5. The connecting hole 15 can be a T-shaped hole, and the screw 16 is embedded in the T-shaped hole. The blind plate 2 has a threaded hole adapted to the screw 16, so that the screw 16 is screwed into the threaded hole. When repairing or replacing the sleeve 9 or the spring 11, the working position of the blind plate 2 can be changed to expose the plug ring to be replaced or repaired, and the screw 16 can be removed. Because there is a gap between the inner and outer sides of the sleeve 9 and the sealing groove 1, it is easy to remove the pressure plate and the sleeve 9.

[0051] In this application, the head of the screw 16 is embedded in the body of the pressure ring 5 to avoid protruding from the working surface of the pressure ring 5, thus ensuring the smoothness of the contour of the blind plate 2 and realizing the detachable connection between the pressure ring 5 and the blind plate 2.

[0052] Beneficial effects: The plug ring sealing structure proposed in this application is superior to the O-ring sealing structure in terms of media compatibility. The service life of the plug ring sealing structure proposed in this application is longer than that of the O-ring sealing structure under corrosive media conditions. The proposed sealing structure for the plug ring is more suitable for high-pressure environments.

[0053] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A blind flange valve sealing structure, disposed on a blind flange (2) between valve covers, characterized in that, include: The sealing groove (1) is annular and is provided on the blind plate (2), with its port facing the valve cover; The plug ring is set in the sealing groove (1), with its top end abutting against the valve cover and its bottom end abutting against the sealing groove (1), and has a receiving gap (3) between it and the outer end face of the sealing groove (1). The extension (4) is annular and is disposed on the outer end side of the plug ring; A pressure ring (5) is provided in the receiving gap (3) and is detachably connected to the bottom end of the sealing groove (1), which is suitable for pressing the extension (4) into the sealing groove (1); The sealing groove (1) consists of two sets, which are respectively set on the outer edge of the open position of the blind plate (2) and the outer edge of the blind position of the blind plate (2).

2. The blind valve sealing structure according to claim 1, characterized in that, The opening (12) of the plug ring faces the inside of the sealing groove (1); The extension (4) is disposed on the outer end side of the ferrule.

3. The blind valve sealing structure according to claim 2, characterized in that, There is a flow gap (14) between the plug ring and the inner end face of the sealing groove (1).

4. The blind valve sealing structure according to claim 3, characterized in that, The extension (4) is located on the side of the sealing ring near the bottom end of the sealing groove (1) and fits against the bottom end of the sealing groove (1).

5. The blind valve sealing structure according to claim 1, characterized in that, The inner end face of the pressure ring (5) is a stepped structure and is adapted to the extension (4).

6. The blind valve sealing structure according to claim 1, characterized in that, The pressure ring (5) does not protrude from the sealing groove (1).

7. The blind valve sealing structure according to claim 1, characterized in that, The pressure ring (5) is provided with a connecting hole (15), which is connected to the blind plate (2) by a screw (16), and the screw (16) is embedded in the pressure ring (5).

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