Manhole sealing structure

Abstract

The present invention discloses a manhole sealing structure, comprising: a manhole is opened on a sealing platform; a screw is connected to the upper surface of a tray, and the screw is perpendicular to the upper surface of the tray; the tray extends from the manhole to the bottom of the sealing platform; a first sealing gasket is sealingly arranged between the sealing platform and the tray; a pressure strip is sleeved on the screw, and the extended two ends of the pressure strip abut against the upper surface of the sealing platform; a first locking nut cooperates with the screw to abut against the pressure strip and force the pressure strip to bend and deform; a second sealing member is provided with a through hole, and the screw passes through the through hole; a second sealing gasket is sealingly arranged between the second sealing member and the upper surface of the sealing platform; a head nut cooperates with the screw, and a third sealing gasket is arranged between the head nut and the second sealing member. The present invention installs two seals at the manhole, and each seal is independent of each other. If the seal is not tight due to the gasket, nut, sealing surface, etc. of one of the seals, it will not affect the sealing performance of the other seal.

Description

Technical Field

[0001] The present invention relates to the technical field of sealing devices, and more specifically, to a manhole sealing structure. Background Art

[0002] At present, many industrial enterprises have manholes installed in equipment such as containers, boilers, water tanks, tanks, etc. The medium in some equipment is normal temperature water such as ordinary water tanks, the medium in some equipment is high temperature and high pressure water such as boilers, the medium in some equipment is high temperature and high pressure steam, and even the medium in some equipment is flammable and explosive gas, liquid, etc., but these large equipment or containers with medium inside are generally equipped with manholes. When there is a fault inside the equipment, the manhole needs to be opened, and personnel enter the interior through the manhole for maintenance or regular cleaning of bottom impurities. However, the manhole seal reserved for the equipment often becomes a part where the medium is easily leaked, especially high temperature and high pressure, flammable, explosive or toxic media, etc. Once leaked, accidents are likely to occur. Even if the manhole is opened normally, even after some manhole covers have just been sealed, it is found that the manhole is not sealed well after the medium is filled into the equipment, and the equipment must be stopped again, the medium inside the equipment is discharged, and the manhole is re-sealed. Especially for containers and storage tanks with larger volumes, when the medium is filled, it is found that the seal is not tight, and it is discharged again. In the process of re-filling the medium, not only the medium is wasted, but also time is wasted, and a lot of manpower and material resources are consumed.

[0003] Therefore, how to provide a manhole sealing structure has become a technical problem that urgently needs to be solved in this field. Summary of the invention

[0004] The object of the present invention is to provide a manhole sealing structure.

[0005] According to the present invention, a manhole sealing structure is provided, comprising: a sealing platform, on which a manhole is formed; a tray, on the upper surface of which a screw is connected, and the screw is perpendicular to the upper surface of the tray; the tray extends from the manhole to the bottom of the sealing platform; a first sealing gasket, which is sealingly arranged between the sealing platform and the tray; a pressure strip, which is sleeved on the screw, and the extended two ends of the pressure strip abut against the upper surface of the sealing platform; a first locking nut, which cooperates with the screw to abut against the pressure strip and force the pressure strip to bend and deform; a second sealing member, which is provided with a through hole, and the screw passes through the through hole; a second sealing gasket, which is sealingly arranged between the second sealing member and the upper surface of the sealing platform; a head nut, which cooperates with the screw, and a third sealing gasket is arranged between the head nut and the second seal, and the head nut presses the second seal and the second sealing gasket against the upper surface of the sealing platform.

[0006] Optionally, the sealing platform includes a first sealing platform and a second sealing platform connected to each other, the first sealing platform is above the second sealing platform, the first sealing platform has a first inner diameter, and the second sealing platform has a second inner diameter; in the axial projection of the manhole, the first sealing platform surrounds the outer circumference of the second sealing platform; the extended ends of the pressure strip respectively abut against the upper surface of the second sealing platform.

[0007] Optionally, the manhole is elliptical; the tray is elliptical; and the second sealing member is elliptical.

[0008] Optionally, the pressure strip is arched.

[0009] Optionally, a third sealing platform protrudes upward from the middle of the second sealing member; the through hole penetrates the third sealing platform; and the outer diameter of the head nut is less than or equal to the outer diameter of the third sealing platform.

[0010] Optionally, the lower surface of the second sealing member has an arched surface, and the arched surface is arched upward.

[0011] Optionally, a closed cavity is formed between the tray, the sealing platform and the second sealing member; a screw hole is provided on the second sealing member; the manhole sealing structure also includes a gauge tube, one end of the gauge tube is cooperatively connected to the screw hole, and a pressure gauge is installed on the other end of the gauge tube.

[0012] Optionally, the extended middle portion of the meter tube is connected to a capillary tube, and the extended end portion of the capillary tube is provided with a quick connector.

[0013] Optionally, the capillary tube is connected to the meter tube at a three-way position; a first small ball valve is provided between the three-way position and the extended end of the meter tube; and a second small ball valve is provided in the extended middle portion of the capillary tube.

[0014] Optionally, the two screw rods are evenly arranged on the upper surface of the tray; the two through holes are evenly arranged on the second sealing member, and the two through holes are respectively opposite to the positions of the two screw rods.

[0015] According to the technical content disclosed in the present invention, the following beneficial effects are achieved:

[0016] The present invention installs two seals at the manhole, and each seal is independent of each other. If the gasket, nut, sealing surface, etc. of one of the seals causes a loose seal, it will not affect the sealing performance of the other seal. However, the two seals are interconnected with the manhole through the same screw, and the two seals form a small sealing cavity. Whether the seal is tight is judged by inputting compressed air. In particular, it can avoid that after the manhole is resealed, it is necessary to fill the equipment with medium to judge whether the seal is tight. If the seal is not tight, the trouble and waste of discharging the medium are required. At the same time, the manhole is designed in the groove, and all sealing components do not protrude outside the equipment.

[0017] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0019] Figure 1 A schematic diagram of a manhole sealing structure provided according to an embodiment from a first perspective;

[0020] Figure 2 It is a schematic diagram from a second perspective of a manhole sealing structure provided according to an embodiment.

[0021] Explanation of the reference numerals: 1-equipment, 2-tray, 3-fourth sealing platform, 4-first sealing gasket, 5-second sealing platform, 6-first sealing platform, 7-pressing strip, 8-nut, 9-second sealing gasket, 10-fifth sealing platform, 11-pressure cover, 12-third sealing platform, 13-screw, 14-third sealing gasket, 15-head nut, 16-screw hole, 17-groove, 18-pressure gauge, 19-gauge tube, 20-first small ball valve, 21-thin tube, 22-second small ball valve, 23-quick connector, 24-gauge tube, 25-screw hole, 26-arch surface, 27-enclosed cavity, 28-pressing platform, 29-manhole, 30-handle. DETAILED DESCRIPTION

[0022] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0023] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0024] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0025] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0026] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0027] The present invention installs two seals at the manhole, and each seal is independent of each other. If the seal is not tight due to reasons such as the gasket, nut, sealing surface, etc. of one of the seals, it will not affect the sealing performance of the other seal. However, the two seals are interconnected with the manhole through the same screw rod, and the two seals form a small sealing cavity. Whether the seal is tight is judged by inputting compressed air. In particular, it can avoid the need to fill the equipment with medium to judge whether the seal is tight just after the manhole is resealed. If the seal is not tight, the trouble and waste of discharging the medium is required.

[0028] See also Figure 1 and Figure 2 According to a first aspect of the present invention, a manhole sealing structure is provided, comprising: a sealing platform, a manhole 29 is formed on the sealing platform; a tray 2, a screw 13 is connected to the upper surface of the tray 2, and the screw 13 is perpendicular to the upper surface of the tray 2; the tray 2 extends from the manhole to the bottom of the sealing platform; a first sealing gasket 4, the first sealing gasket 4 is sealingly arranged between the sealing platform and the tray 2; a pressure strip 7, the pressure strip 7 is sleeved on the screw 13, and the extended two ends of the pressure strip 7 abut against the upper surface of the sealing platform; a nut 8, the nut 8 and the The screw rod 13 cooperates with the pressure strip 7 to abut against the pressure strip 7 and forces the pressure strip 7 to bend and deform; the pressure cover 11, the pressure cover 11 is provided with a through hole, and the screw rod 13 passes through the through hole; the second sealing gasket 9, the second sealing gasket 9 is sealed between the pressure cover 11 and the upper surface of the sealing platform; the head nut 15, the head nut 15 cooperates with the screw rod 13, and a third sealing gasket 14 is provided between the head nut 15 and the pressure cover 11, and the head nut 15 presses the pressure cover 11 and the second sealing gasket on the upper surface of the sealing platform.

[0029] According to the above scheme, the sealing platform further includes a first sealing platform 6 and a second sealing platform 5 which are connected to each other, the first sealing platform 6 is above the second sealing platform 5, the first sealing platform 6 has a first inner diameter, and the second sealing platform 5 has a second inner diameter; in the axial projection of the manhole, the first sealing platform 6 surrounds the outer periphery of the second sealing platform 5; the extended ends of the pressure strip 7 are respectively abutted against the upper surface of the second sealing platform 5.

[0030] According to the above solution, further, the manhole is elliptical; the tray 2 is elliptical; and the gland 11 is elliptical.

[0031] According to the above solution, further, the pressure strip 7 is arched.

[0032] According to the above solution, further, a third sealing platform 12 protrudes upward from the middle of the gland 11 ; the through hole penetrates the third sealing platform 12 ; and the outer diameter of the head nut 15 is less than or equal to the outer diameter of the third sealing platform 12 .

[0033] According to the above solution, further, the lower surface of the gland 11 has an arched surface 26 , and the arched surface 26 is arched upward.

[0034] According to the above scheme, a closed cavity 27 is further formed between the tray 2, the sealing platform and the pressure cover 11; a first screw hole 25 is opened on the pressure cover 11; the manhole sealing structure also includes a second gauge tube 24, one end of the second gauge tube 24 is connected to the first screw hole 25, and the other end of the second gauge tube 24 is installed with a pressure gauge 18.

[0035] According to the above solution, further, the extended middle portion of the second gauge tube 24 is connected to the capillary tube 21 , and the extended end portion of the capillary tube 21 is provided with a quick connector 23 .

[0036] According to the above scheme, the capillary tube 21 is further connected to the second meter tube 24 at a three-way position; a first small ball valve 20 is provided between the three-way position and the extended end of the second meter tube 24; and a second small ball valve 22 is provided in the extended middle part of the capillary tube 21.

[0037] According to the above solution, the two screw rods 13 are evenly arranged on the upper surface of the tray 2; the two through holes are evenly arranged on the pressure cover 11, and the two through holes are respectively opposite to the positions of the two screw rods 13.

[0038] Specifically, the first sealing method is as follows: an elliptical manhole 29 is provided on the upper part or the side of the device 1. When there is no sealing, the manhole 29 is connected to the device 1, and the inside of the device 1 can be entered through the manhole 29. The manhole of the device 1 is in an elliptical groove 17, and the diameter of the groove 17 is slightly larger than the diameter of the manhole. An elliptical second sealing platform 5 and a first sealing platform 6 are provided around the manhole 29. The second sealing platform 5 and the first sealing platform 6 are connected to the device 1 as a whole. The bottom surface of the second sealing platform 5 is a flange-type sealing surface, and the upper surface of the first sealing platform 6 is also a flange-type sealing surface. When the manhole of the device 1 needs to be closed, the elliptical tray 2 can be tilted and placed inside the manhole. An elliptical fourth sealing platform 3 is provided around the tray 2. The upper surface of the fourth sealing platform 3 is a flange-shaped sealing surface, and the sealing surface protrudes from the tray. The sealing surface of the fourth sealing platform 3 and the first sealing platform 6 are connected to the device 1 as a whole. The sealing surface width and diameter of the second sealing platform 5 are equal. A handle 30 is fixed in the middle of the tray 2. Two screws 13 are fixedly connected in the middle of the upper part of the tray 2. One end of the two screws 13 is fixed to the tray as a whole. The two screws 13 have external threads. The handle 30 prevents the tray from falling into the equipment 1 during installation. An elliptical first sealing gasket 4 is placed between the fourth sealing platform 3 and the second sealing platform 5. There is a round hole in the middle of the pressure strip 7. The two pressure strips 7 are respectively inserted into the screws 13, and the nut 8 is screwed in from the upper end of the screw 13 along the thread. The pressure strip 7 is arched as a whole, and the arch makes it easier to concentrate the pressure at both ends of the pressure strip 7. There are pressure platforms 28 at both ends of the pressure strip 7. The pressure strip 7 is parallel to the short diameter of the elliptical manhole. The pressure platforms of the two pressure strips are pressed on the upper surface of the second sealing platform 5 in parallel. The nut 8 is gradually tightened. The greater the pressure of the pressure strip 7 on the upper surface of the sealing platform, the tighter it is. As the nut 8 is rotated downward and tightened, the screw lifts the tray 2 upward, and the fourth sealing platform 3 around the tray 2 also presses the first sealing gasket 4 tightly against the lower surface of the second sealing platform 5, so that the tray 2 and the first sealing gasket 4 form a first manhole seal for the equipment 1.

[0039] The second sealing method is: there are two small holes on the gland 11 which are slightly larger than the outer diameter of the screw 13, and the positions of the small holes on the gland 11 correspond to the positions of the screw 13. The elliptical second sealing gasket 9 is first placed on the lower part of the gland 11, i.e., the upper part of the first sealing platform 6, and then the gland 11 is passed through the screw 13 and placed on the manhole 29. The periphery of the gland 11 is also an elliptical fifth sealing platform 10, and the lower surface of the fifth sealing platform 10 is a flange-shaped sealing surface. The sealing surface width and diameter of the fifth sealing platform 10 are equal to those of the first sealing platform 6. When the gland 11 is lowered, the second sealing gasket 9 is just pressed between the first sealing platform 6 and the fifth sealing platform 10. In order to prevent leakage from the gap between the screw rod 13 and the gland 11, a smaller circular third sealing platform 12 is provided around the two small holes of the gland 11, and a smaller circular third sealing gasket 14 with a comparable diameter is placed on the third sealing platform 12. A second screw hole 16 is provided in the middle of the head nut 15, and the second screw hole 16 has threads. The second screw hole 16 is not a through hole, and one end thereof is closed. The outer diameter of the head nut 15 is equal to the outer diameter of the third sealing platform 12, and the lower part of the gland 11 is still arc-shaped. When the head nut 15 at the top of the two screw rods 13 is gradually tightened, the arc shape makes it easier to concentrate the pressure on the fifth sealing platform 10 around the gland 11, and the fifth sealing platform 10 presses the second sealing gasket 9 tightly on the first sealing platform 6, and at the same time, the nut presses the third sealing gasket 14 tightly on the third sealing platform 12, so that the gland 11, the second sealing gasket 9, the third sealing gasket 14, etc. form a second manhole seal for the equipment 1. Even if the nut 8 of the first seal is loose or other reasons cause the medium in the equipment to leak through the seal, the second seal can prevent the medium leaking into the manhole from flowing out of the equipment 1, thus playing a good sealing and protective role.

[0040] Method to judge whether the manhole is tightly sealed: Traditional manhole covers are resealed due to leakage or other reasons to open the manhole. After the manhole cover is just sealed, the medium must be re-injected into the equipment to observe whether there is leakage in order to judge whether it is sealed well. After the medium is filled into the equipment, it is found that the manhole is not sealed well, and the equipment must be stopped again, the medium inside the equipment is discharged, and the manhole is sealed again. Especially for large-volume containers and storage tanks, when filling the medium, it is found that the seal is not tight, and it is discharged again. In the process of filling the medium again, not only the medium is wasted, but also time is wasted, and a lot of manpower and material resources are consumed. The present invention forms a smaller closed cavity 27 between the tray 2 and the gland 11, and a small first screw hole 25 can be designed on the gland 11. The second gauge tube 24 is installed on the first screw hole 25, and the first small ball valve 20, the first gauge tube 19, the pressure gauge 18 and the thin tube 21, the second small ball valve 22, and the quick connector 23 are installed on the second gauge tube 24. After the manhole 29 of the equipment 1 is sealed, before the equipment 1 is filled with medium and put into operation, the compressed air hose is connected to the quick connector 23, and the compressed air is filled into the closed cavity 27 through the quick connector 23, the second small ball valve 22, the thin tube 21, the second gauge tube 24, and the first screw hole 25, and then the second small ball valve 22 is closed, and the pressure value displayed on the pressure gauge 18 is observed. When the pressure value displayed on the pressure gauge 18 remains unchanged after a period of time, it means that the manhole is tightly sealed and there is no leakage. After confirming that the seal is tight, the medium is filled into the equipment 1 and the equipment 1 is put into operation. If the pressure value displayed by the pressure gauge 18 drops quickly, it means that the manhole is not tightly sealed and should be resealed. After resealing, fill it with compressed air again to conduct a tightness test, and make sure that the manhole is tightly sealed before putting the equipment 1 into use. Even during the normal operation of the equipment 1, although there is no leakage of medium from the manhole 29, the second small ball valve 22 can be opened. If there is medium flowing out from the quick connector, it means that there is a leakage between the first seal, that is, the fourth sealing platform 3 and the second sealing platform 5. Then close the second small ball valve 22. Since the second seal is still good, the manhole 29 can be resealed at an appropriate time. Even if there is no obvious medium outflow when the second small ball valve 22 is opened, compressed air can still be filled into the closed cavity 27 through the quick connector 23, the second small ball valve 22, the capillary 21, the second gauge tube 24, and the first screw hole 25. By observing the pressure value displayed by the pressure gauge 18, it can be judged whether there is a leakage between the first seal, that is, the fourth sealing platform 3 and the second sealing platform 5.

[0041] In order to prevent the sealing device of the manhole 29 from protruding outside the equipment, especially in some equipment where the manhole is located on the side of the equipment, the protruding sealing device may occupy extra space, which is not beautiful and inconvenient for people to pass through. An elliptical groove 17 can be designed at the manhole 29 of the equipment 1. The manhole is in the elliptical groove 17, and the sealing devices of the manhole such as the head nut 15, the screw 13, the gland 11, etc. are installed in the groove. After the manhole is sealed, the top of the device is just flush with the outer edge of the equipment 1, so that it does not take up more space, is more beautiful and safe.

[0042] In summary, the present invention installs two seals at the manhole, and each seal is independent of each other. If the gasket, nut, sealing surface, etc. of one of the seals causes a loose seal, it will not affect the sealing performance of the other seal. However, the two seals are interconnected through the same screw and the manhole, and the two seals form a small sealing cavity. Whether the seal is tight is judged by inputting compressed air. In particular, it can avoid the need to fill the equipment with medium to judge whether the seal is tight after the manhole is resealed. If the seal is not tight, the trouble and waste of discharging the medium will be caused. At the same time, the manhole is designed in the groove, and all sealing components do not protrude outside the equipment.

[0043] Although some specific embodiments of the present invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A manhole sealing structure, characterized in that: include: A sealing platform, wherein a manhole is formed on the sealing platform; A tray, wherein the upper surface of the tray is connected with a screw rod, and the screw rod is perpendicular to the upper surface of the tray; The tray extends from the manhole to below the sealing platform; a first sealing gasket, the first sealing gasket being sealingly disposed between the sealing platform and the tray; A pressure strip, wherein the pressure strip is sleeved on the screw rod, and the extended two ends of the pressure strip abut against the upper surface of the sealing platform; A first locking nut, wherein the first locking nut cooperates with the screw rod to abut against the pressure strip and force the pressure strip to bend and deform; a second sealing member, wherein the second sealing member is provided with a through hole, and the screw rod passes through the through hole; a second sealing gasket, the second sealing gasket being sealingly disposed between the second sealing member and an upper surface of the sealing platform; A sealing nut, the sealing nut cooperates with the screw rod, a third sealing gasket is arranged between the sealing nut and the second sealing member, and the sealing nut presses the second sealing member and the second sealing gasket against the upper surface of the sealing platform; The lower surface of the second sealing member has an arched surface, and the arched surface is arched upward; A closed cavity is formed between the tray, the sealing platform and the second sealing member; The second sealing member is provided with a screw hole; The manhole sealing structure also includes a gauge tube, one end of which is connected to the screw hole, and the other end of which is equipped with a pressure gauge. The extended middle portion of the meter tube is connected with a capillary tube, and the extended end portion of the capillary tube is provided with a quick connector; The capillary tube is connected to the meter tube at a three-way position; a first small ball valve is provided between the three-way position and the extended end of the meter tube; A second small ball valve is arranged in the extended middle portion of the capillary tube.

2. The manhole sealing structure according to claim 1, characterized in that: The sealing platform comprises a first sealing platform and a second sealing platform connected to each other, the first sealing platform is above the second sealing platform, the first sealing platform has a first inner diameter, and the second sealing platform has a second inner diameter; In the axial projection of the manhole, the first sealing platform surrounds the outer circumference of the second sealing platform; The extended two ends of the pressure strip are respectively in contact with the upper surface of the second sealing platform.

3. The manhole sealing structure according to claim 2, characterized in that: The manhole is oval; The tray is oval in shape; The second sealing member is oval in shape.

4. The manhole sealing structure according to any one of claims 1 to 3, characterized in that: The layering strip is arched.

5. The manhole sealing structure according to any one of claims 1 to 3, characterized in that: A third sealing platform protrudes upward from the middle of the second sealing member; The through hole penetrates the third sealing platform; The outer diameter of the head nut is less than or equal to the outer diameter of the third sealing platform.

6. The manhole sealing structure according to any one of claims 1 to 3, characterized in that ； The two screws are evenly arranged on the upper surface of the tray; The two through holes are evenly arranged on the second sealing member, and the two through holes are respectively opposite to the positions of the two screw rods.

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