Self-tightening manhole device for high-voltage equipment
By employing a double-hinge structure and a slotted guide plate design in high-pressure equipment, the self-tightening manhole device solves the problem of cumbersome opening and closing processes in high-pressure equipment manhole devices, achieving convenient operation and reliable sealing, and is suitable for high-temperature and high-pressure environments.
Patent Information
- Application Number
- CN202520432546.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-12
- Publication Date
- 2025-12-12
- Estimated Expiration
- 2035-03-12
AI Technical Summary
Existing high-pressure equipment manhole devices are cumbersome to tighten during opening or closing, and the seals are unreliable, especially in high-temperature and high-pressure environments where they are prone to leakage. Traditional structures are difficult to achieve precise positioning and sealing.
The manhole cover features a double hinge structure and a slot and guide plate design. The combination of the hinge plate and connecting rod enables convenient opening and closing of the manhole cover. The positioning structure of the pre-tightening bolts and guide plate simplifies the installation process, and the final seal is achieved through the pressure of the medium.
It reduces the difficulty of opening and closing manholes in high-pressure equipment, improves the reliability and convenience of sealing, avoids the problem of pre-tightening bolts not being able to be screwed in due to incorrect angle, and ensures that the sealing surface fits tightly.
Smart Images
Figure CN223662544U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of pressure vessels, in particular to a self-tight manhole device for high-pressure equipment. BACKGROUND
[0002] The sealing structure of a general manhole is a flange bolt structure, that is, the manhole cover and gasket are pressed by the tightening force of the bolt to achieve sealing. However, the bolt will be strained and relaxed under the long-term internal pressure and temperature difference load, resulting in leakage at the sealing surface, because the high-pressure equipment has high internal pressure and is often accompanied by high temperature. In order to avoid leakage, the manhole cover is usually built-in, and the initial sealing is achieved by pre-tightening the bolt. After normal operation, the manhole cover is pushed out by the internal medium pressure because the manhole cover is built-in, thereby pressing the sealing gasket to achieve sealing. This manhole device that relies on the medium pressure to achieve sealing is usually called a self-tight manhole device, and a typical structure is shown in Figure 1 .
[0003] The existing structure is heavy, and the single-hinge structure is difficult to center and tighten when opening or closing the manhole cover due to manufacturing errors, reserved rotation gaps and other factors. It often needs to be pried and hammered with large tools and multiple people to complete. In addition, the pre-tightening bolt needs to be screwed into the manhole cover, and before the manhole cover is closed in place, it cannot be screwed in due to the angle, resulting in the inability to close in place with the tightening force of the bolt when the manhole is closed. CONTENT OF THE UTILITY MODEL
[0004] The present application provides a self-tight manhole device for high-pressure equipment with a built-in manhole cover, which is easy to open and close and has reliable sealing, to reduce the difficulty of opening and closing the manhole of high-pressure equipment and facilitate internal inspection or maintenance of the equipment.
[0005] The present application provides a self-tight manhole device for high-pressure equipment, which includes a manhole ring embedded in the equipment cylinder or head, a manhole cover hinged to the inner wall of the equipment through double connecting rods, a pre-tightening bolt, and a clamping groove for positioning and installing the pre-tightening bolt.
[0006] The manhole ring is welded and embedded into the equipment cylinder or head. The manhole cover is built into the equipment and connected to the manhole ring by a compression sealing gasket. Two hinge plates are provided on the back of the manhole cover (the side opposite the sealing surface), arranged parallel to each other. The hinge plates are connected to two connecting rods by hinge bolts and hinge nuts, respectively. Each connecting rod has a ring at both ends, which can rotate around the hinge bolt. Two fixing plates are provided on the inner wall of the equipment, each also connected to the other end ring of the connecting rod by hinge bolts. A C-shaped groove is welded to the front of the manhole cover, with U-shaped grooves at both ends. The pre-tightening bolt is placed in the U-shaped groove. The guide plate is a thin plate tightly fitted to the groove, with an arc-shaped opening groove. The arc-shaped opening, in conjunction with the U-shaped opening of the groove, can position the pre-tightening bolt. The guide plate is connected to the groove by a clamping screw. The pre-tightening beam is a rod-shaped structure with bolt holes in the middle. In the assembled state, the pre-tightening beam presses tightly against the outer end face of the manhole ring, and the pre-tightening bolts pass through the bolt holes and are fixed to the pre-tightening beam by the pre-tightening nuts. A handle is also provided on the front of the manhole cover, which can be pushed or pulled to open or close the manhole cover.
[0007] The beneficial effects of this utility model are:
[0008] 1. The double-hinge structure ensures more even force distribution at the hinge points. The weight borne by a single hinge point is half that of a single hinge, resulting in less torque and easier pushing and pulling. Furthermore, during installation, adjusting the hinge nuts at the four positions on the hinge plate and fixing plate allows for precise positioning of the manhole cover, avoiding the problem of the single-hinge structure where the manhole cover tilts down after being pushed away from the manhole ring and cannot be properly closed again.
[0009] 2. The manhole cover uses a slot and guide plate to position the pre-tightening bolt, making it more convenient and faster than the traditional threaded structure. The U-shaped slot structure eliminates the need for precise positioning when installing the pre-tightening bolt; the bolt engages simply by opening or closing the manhole cover to a certain angle. Using the engaged pre-tightening bolt to assist in pushing or pulling the manhole cover is less strenuous than using a handle. It also avoids the problem of the pre-tightening bolt being unable to be screwed in when the manhole cover is not fully closed due to an incorrect angle, as is common with traditional structures. Attached Figure Description
[0010] Figure 1 This is a diagram of a typical self-tightening manhole device.
[0011] Figure 2 This is a diagram of a self-tightening manhole device for high-pressure equipment.
[0012] Figure 3 This is a left view of a self-tightening manhole device for high-pressure equipment.
[0013] Figure 4 This is a top view of a self-tightening manhole device for high-pressure equipment.
[0014] Figure 5 The state diagram when the manhole cover is opened.
[0015] Figure 6 The Figure 4 A view of the high-pressure equipment self-tightening manhole device.
[0016] Figure 7 The Figure 4 B-B view of the high-pressure equipment self-tightening manhole device.
[0017] Figure 8 The Figure 7 C view of the high-pressure equipment self-tightening manhole device.
[0018] Figure 9 The Figure 7 D-D view of the high-pressure equipment self-tightening manhole device.
[0019] Figure 10 Detail view of the 12 card slot.
[0020] Figure 11 Detail view of the 13 guide plate.
[0021] Figure 12 Detail view of the 15 pre-tightening beam.
[0022] In the figure: 1 - head, 2 - manhole ring, 3 - sealing gasket, 4 - manhole cover, 5 - hinged bolt, 6 - hinged nut, 7 - first connecting rod, 8 - first hinged plate, 9 - second hinged plate, 10 - second connecting rod, 11 - pre-tightening bolt, 12 - card slot, 13 - guide plate, 14 - compression screw, 15 - pre-tightening beam, 16 - pre-tightening nut, 17 - handle, 18 - fixed plate. DETAILED DESCRIPTION
[0023] In order to make the purpose, technical scheme and advantages of the present application clearer, the embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
[0024] First, the embodiments of the present application will be introduced below with reference to the accompanying drawings.
[0025] The manhole device comprises a manhole ring 2, a head 1, a manhole cover 4, a sealing gasket 3, and a pre-tightening beam 15; wherein the sealing gasket 3 is arranged between the manhole ring 2 and the manhole cover 4; the manhole cover 4 is provided with two hinged plates on the side facing the inside of the manhole device; two pre-tightening beams 15 are symmetrically arranged in parallel on the manhole ring 2; a pre-tightening nut 16 is arranged at the middle position of the pre-tightening beam 15;
[0026] The manhole ring 2 is embedded in the head 1 by welding, and the manhole cover 4 is built-in in the manhole device and connected with the manhole ring 2 by compressing the sealing gasket 3.
[0027] The other side of the manhole cover 4, i.e., the side opposite to the sealing surface, is provided with a first hinge plate 8 and a second hinge plate 9, which are arranged in parallel; the first hinge plate 8 and the second hinge plate 9 are connected with a first connecting rod 7 and a second connecting rod 10 respectively through a hinge bolt 5 and a hinge nut 6; the two ends of the connecting rod are provided with a circular ring, which can rotate around the hinge bolt 5; the hinge nut at each hinge point is at least two, which can adjust the gap at the hinge point to realize accurate positioning of the manhole cover, and prevent the nut from loosening and falling off.
[0028] Two fixed plates 18 are arranged on the inner wall of the manhole device, and the two fixed plates are connected with the other end of the first connecting rod 7 and the second connecting rod 10 through the hinge bolt 5.
[0029] The side of the manhole cover 4 facing the outside is welded with a clamping groove 12, which is a C-shaped structure, and two ends are symmetrically provided with a U-shaped notch; the pre-tightening bolt 11 is arranged in the U-shaped notch.
[0030] The guide plate 13 is a thin plate closely attached to the clamping groove 12, and the guide plate 13 is provided with an arc-shaped opening slot in a central symmetric manner; the arc-shaped opening slot faces and is located at a position matched with the U-shaped notch of the clamping groove 12, and is matched with and capable of positioning the pre-tightening bolt 11; the guide plate 13 is connected with the clamping groove 12 through a pressing screw 14.
[0031] The pressing screw is loosened, and the guide plate 13 rotates around the pressing screw 14; when the guide plate is rotated to a preset angle and is misaligned with the U-shaped notch of the clamping groove, the pre-tightening bolt 11 can be directly taken out along the axial direction of the clamping groove 12. Similarly, when the pre-tightening bolt 11 is installed, the pre-tightening bolt is first pushed into the U-shaped notch along the axial direction of the clamping groove 12, and then the guide plate is rotated to overlap with the U-shaped clamping groove; the arc-shaped opening slot of the guide plate 13 overlaps with the U-shaped notch of the clamping groove 12, thereby locking the position of the pre-tightening bolt 11, and then the pressing screw 14 is tightened.
[0032] The pre-tightening beam 15 is a rod-shaped structure with a bolt hole in the middle; the pre-tightening bolt 11 passes through the bolt hole and is fixed on the pre-tightening beam 15 through a pre-tightening nut 16; by tightening the pre-tightening nut 16, the pre-tightening beam 15 tightly presses the end of the manhole ring 2, thereby tightening the manhole cover 4 and realizing the initial sealing of the manhole.
[0033] When the device starts to operate, the pressure of the internal medium acts on the back of the manhole cover 4, pushing the manhole cover 4 outward, so that the manhole cover 4 tightly presses the sealing gasket 3; the greater the internal medium pressure, the greater the pressing force on the sealing gasket, and the more reliable the sealing. The side of the manhole cover 4 facing the outside is also provided with a handle 17, and the opening or closing of the manhole cover can be realized by pushing or pulling the handle.
[0034] The opening manhole steps are as follows: loosening the pre-tightening nut 16, taking off the pre-tightening beam 15, loosening the pressing screw 14, rotating or taking out the guide plate 13, taking out the pre-tightening bolt 11 from the U-shaped notch, holding the handle 17, and pushing the manhole cover to the inside of the equipment by force.
[0035] The closing manhole steps are as follows: holding the handle 17, pulling the manhole cover 4 to the outside of the equipment, when the manhole cover 4 is attached to the sealing gasket 3 and the manhole ring 2, clamping the pre-tightening bolt 11 from the U-shaped notch, positioning the pre-tightening bolt by putting in the guide plate 13, tightening the pressing screw 14, putting the pre-tightening beam 15 into the pre-tightening bolt 11, tightening the pre-tightening nut 16, and making the manhole cover 4 tightly attached to the sealing gasket 3 by the pulling force of the pre-tightening bolt 11 to realize the initial sealing of the manhole device. With the operation of the equipment, the internal pressure gradually increases, and the final sealing of the manhole is completed by the internal pressure of the equipment.
[0036] The above-described embodiments of the present application do not constitute a limitation on the protection scope of the present application.
Claims
1. A self-tightening manhole device for high-voltage equipment, characterized by, The manhole device comprises a manhole ring (2), a head (1), a manhole cover (4), a sealing gasket (3), a pre-tightening beam (15), and a guide plate (13); The sealing gasket (3) is arranged between the manhole ring (2) and the manhole cover (4); The manhole cover (4) is provided with two hinged plates on the side facing the inside of the manhole device; the two pre-tightening beams (15) are symmetrically arranged on the manhole ring (2); the pre-tightening beam (15) is provided with a pre-tightening nut (16) at the middle position; The manhole ring (2) is embedded in the device head (1) by welding, and the manhole cover (4) is arranged in the manhole device and connected with the manhole ring (2) by pressing the sealing gasket (3).
2. The manhole apparatus of claim 1, wherein, The back side of the manhole cover (4), i.e., the side facing the inside of the manhole device, is provided with a first hinged plate (8) and a second hinged plate (9), which are arranged in parallel; the first hinged plate (8) and the second hinged plate (9) are connected with a first connecting rod (7) and a second connecting rod (10) respectively through a hinged bolt (5) and a hinged nut (6); the two ends of the connecting rod are provided with a circular ring, which can rotate around the hinged bolt (5); the hinged nut at each hinged point is at least two; Two fixed plates (18) are arranged on the inner wall of the manhole device, and the two fixed plates are connected with the other end of the first connecting rod (7) and the second connecting rod (10) through a hinged bolt (5).
3. The manhole apparatus of claim 1, wherein, The side of the manhole cover (4) facing the outside is welded with a clamping groove (12), which is a C-shaped structure, and the two ends are symmetrically provided with a U-shaped notch; the pre-tightening bolt (11) is arranged in the U-shaped notch.
4. The manhole apparatus of claim 1, wherein, The guide plate (13) is a thin plate closely attached to the clamping groove (12), and the guide plate (13) is provided with an arc-shaped opening slot in a central symmetric manner; the arc-shaped opening slot is matched with the U-shaped notch of the clamping groove (12) in terms of direction and position, and is matched with the pre-tightening bolt (11), and can position the pre-tightening bolt (11); the guide plate (13) is connected with the clamping groove (12) through a pressing screw (14).
5. The manhole apparatus of claim 1, wherein, The pre-tightening beam (15) is a rod-shaped structure with a bolt hole in the middle; the pre-tightening bolt (11) passes through the bolt hole and is fixed on the pre-tightening beam (15) through the pre-tightening nut (16); by tightening the pre-tightening nut (16), the pre-tightening beam (15) tightly presses the end of the manhole ring (2), and the manhole cover (4) is tightened, thereby realizing the initial sealing of the manhole device.
6. The manhole apparatus of claim 1, wherein, The side of the manhole cover (4) facing the outside is also provided with a handle (17); by pushing or pulling the handle, the manhole cover can be opened or closed.