Manhole structure of pressure-bearing equipment

Abstract

The utility model discloses a manhole structure of pressure-bearing equipment, which relates to the technical field of manholes of pressure-bearing equipment and comprises a barrel, and a connecting frame is fixedly connected to the side face of the barrel. The manhole door is used for sealing the barrel, the manhole door is hinged to the connecting frame, a plurality of connecting holes are annularly and evenly distributed in the manhole door, a plurality of matching holes corresponding to the connecting holes are formed in the barrel, and a handle is fixedly installed on the outer side face of the manhole door; the manhole door has the advantages that due to the fact that when the manhole door is opened, needed instantaneous force is relatively large, and ordinary workers cannot open the manhole door easily, the cam and the extension plate are arranged, and the size of the nut connected with the cam is the same as that of the bolt on the manhole door; the nut is rotated through the wrench to drive the cam to rotate, the cam jacks up the extension plate, and then the manhole door is separated from the barrel. According to the structure, the force required for opening the manhole door can be reduced, meanwhile, the occupied space is relatively small, and the practicability is good.

Description

Technical Field

[0001] This utility model relates to the field of manhole technology for pressure equipment, and in particular to a manhole structure for pressure equipment. Background Technology

[0002] A manhole is an opening structure used for personnel to enter and exit equipment for installation, maintenance, and safety inspection. A manhole structure consists of a cylinder (also called a section or short pipe) for workers to enter the pressure equipment and a manhole door for sealing the cylinder. The design of a manhole structure generally needs to consider two aspects: how to open the manhole door with relatively little force and its sealing performance.

[0003] To ensure the airtightness of the manhole structure, multiple sets of bolts are typically used to tightly seal the manhole door to the cylinder. This results in a large instantaneous force required to open the manhole door, making it difficult to open. To address this issue, existing technologies often employ worm gear mechanisms, lead screw mechanisms, or lifting mechanisms to open the manhole door. While worm gear and lead screw mechanisms can open manhole doors effectively, cost limitations have hindered their widespread adoption and limited application. Lifting mechanisms, based on lever or lead screw principles, have a relatively simple structure and wider application, but they occupy more space, making them inconvenient for storage and transportation. Utility Model Content

[0004] The purpose of this utility model is to provide a manhole structure for pressure equipment in order to solve the above-mentioned problems.

[0005] This utility model achieves the above objectives through the following technical solutions:

[0006] A manhole structure for pressure equipment, comprising:

[0007] The cylindrical body has a connecting frame fixedly connected to its side.

[0008] Manhole door, used to seal the cylinder, the manhole door is hinged to the connecting frame, the manhole door has several connecting holes evenly distributed in a ring, the cylinder has several mating holes corresponding to the connecting holes, and a handle is also fixedly installed on the outer side of the manhole door;

[0009] A sealing ring is installed between the cylinder and the manhole door; the sealing ring is used to seal the cylinder.

[0010] A mounting bracket is fixedly connected to the side of the cylinder away from the connecting frame. A cam is rotatably mounted on the mounting bracket. A hexagonal nut is fixedly connected to the shaft of the cam. An extension plate that cooperates with the cam is fixedly connected to the manhole door at the position corresponding to the cam.

[0011] As a further improvement, the mounting bracket is also threaded with support bolts to prevent the manhole door from closing.

[0012] As a further improvement, the cylinder body is integrally formed with several annular reinforcing ribs, which are used to reduce the deformation of the cylinder body.

[0013] As a further improvement, the inner side of the manhole door is integrally formed with an annular protrusion, and a sealing sleeve is fitted on the annular protrusion.

[0014] As a further improvement, the outer side of the manhole door is fixedly connected with several strip-shaped reinforcing ribs.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] 1. Since opening a manhole requires a relatively large instantaneous force, making it difficult for ordinary workers to do so, this invention addresses this issue by incorporating a cam and an extension plate. The nut connected to the cam is the same size as the bolts on the manhole. After all the bolts on the manhole are removed, a wrench is used to turn the nut, which in turn drives the cam to rotate. The cam then lifts the extension plate, separating the manhole from the cylinder. This structure reduces the force required to open the manhole while occupying relatively little space, making it highly practical.

[0017] 2. To prevent the manhole door from being difficult to open due to deformation of the cylinder, this utility model also provides several annular reinforcing ribs to improve the stability of the cylinder and reduce the deformation of the cylinder. At the same time, an annular protrusion is provided on the inner side of the manhole door and a sealing sleeve is fitted on it. When the manhole door is sealed, the sealing sleeve fits tightly with the corresponding annular reinforcing rib, further improving the sealing effect of the manhole structure and preventing the sealing effect from being affected by wear of one of the sealing structures. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a front view schematic diagram of a manhole structure for a pressure-bearing device according to the present invention.

[0020] Figure 2 This is a top view of the manhole structure of a pressure-bearing device according to the present invention.

[0021] Figure 3 yes Figure 1 AA sectional view.

[0022] Figure 4 yes Figure 3 Enlarged view of part B.

[0023] The annotations in the attached figures are explained as follows:

[0024] 1. Manhole door; 101. Strip reinforcing rib; 102. Connecting hole; 103. Connecting bracket; 104. Handle; 105. Extension plate; 106. Sealing ring; 107. Annular protrusion; 108. Sealing sleeve; 2. Cylinder body; 201. Annular reinforcing rib; 3. Opening mechanism; 301. Support bolt; 302. Mounting bracket; 303. Cam. Detailed Implementation

[0025] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood through the specific circumstances.

[0027] The present invention will be further described below with reference to the accompanying drawings:

[0028] like Figures 1-4 As shown, the manhole structure for the pressure equipment includes a cylinder 2 and a manhole door 1. One end of the cylinder 2 is connected to the pressure equipment, and the manhole door 1 is located at the other end. A connecting frame 103 is welded to the side of the cylinder 2, and the manhole door 1 is hinged to the connecting frame 103.

[0029] Manhole door 1 is used to seal cylinder 2. Manhole door 1 has several connecting holes 102 evenly distributed in a ring. Cylinder 2 has several mating holes corresponding to the connecting holes 102. Bolts pass through the connecting holes 102 and the mating holes to connect cylinder 2 and manhole door 1. The connecting holes 102 and the mating holes can be threaded holes or smooth holes. A handle 104 is also welded to the outer side of manhole door 1 to facilitate opening manhole door 1. Several strip-shaped reinforcing ribs 101 are fixedly connected to the outer side of manhole door 1.

[0030] A sealing ring 106 is installed between the cylinder 2 and the manhole 1. The sealing ring 106 is used to seal the cylinder 2. Both the cylinder 2 and the manhole 1 are provided with annular grooves for cooperating with the sealing ring 106. The sealing ring 106 is fixed in any one of the annular grooves.

[0031] A mounting bracket 302 is fixedly connected to the side of the cylinder 2 away from the connecting frame 103. The mounting bracket 302 is welded with a triangular bracket or triangular load-bearing plate, etc., to improve its stability. A cam 303 is rotatably mounted on the mounting bracket 302. A hexagonal nut (not shown in the figure) is fixedly connected to the shaft of the cam 303. The size of the hexagonal nut is the same as the bolt size on the manhole door 1, so that the same wrench can be used to drive the cam 303 to rotate, eliminating the need for a specific driving tool. An extension plate 105 that mates with the cam 303 is fixedly connected to the manhole door 1 at the position corresponding to the cam 303. In this embodiment, a torsion spring is also sleeved on the shaft of the cam 303, so that the cam 303 returns to its initial direction when no external force is applied, preventing collision with the cam 303 when the manhole door 1 is closed. In other embodiments, other snap-fit ​​components can be used instead of the hexagonal nut.

[0032] In this embodiment, the mounting bracket 302 is also threaded with a support bolt 301 for preventing the manhole door 1 from closing. The size of the support bolt 301 is the same as the size of the bolt on the manhole door 1. When the manhole door 1 is opened, the support bolt 301 is rotated to extend out of the mounting bracket 302. The support bolt 301 extends out, preventing the manhole door 1 from closing normally, thus avoiding accidents caused by external unexpected situations.

[0033] like Figure 3 As shown, the cylinder 2 has several annular reinforcing ribs 201 integrally formed inside. The annular reinforcing ribs 201 are used to reduce the deformation of the cylinder 2 and reduce the difficulty in opening the manhole door 1 due to the deformation of the cylinder 2.

[0034] Because manhole structures are used on pressure equipment, they must have good sealing properties, such as... Figure 4As shown, the inner surface of the manhole door 1 is integrally formed with an annular protrusion 107, and a sealing sleeve 108 is fitted on the annular protrusion 107. The annular protrusion 107 cooperates with the annular reinforcing rib 201 near the manhole door 1 to improve the sealing performance of the manhole structure. In this way, even if one of the sealing structures wears and cracks, the other sealing structure can still ensure the sealing performance of the manhole structure.

[0035] Working principle: When manhole door 1 needs to be opened, first observe the pressure gauge of the pressure vessel to confirm that the internal pressure of the pressure vessel is at normal pressure. Then, remove each bolt on manhole door 1 one by one. After all bolts are removed, drive cam 303 to rotate using a wrench (or other special tool). The wrench can extend the lever arm, reducing the force required to rotate cam 303. After cam 303 rotates, the protruding part of cam 303 pushes up extension plate 105, thereby separating manhole door 1 from cylinder 2. Then, manhole door 1 can be opened using handle 104. After manhole door 1 is opened, rotate support bolt 301 to extend it. Support bolt 301 limits manhole door 1, so even if an accident causes manhole door 1 to close, due to the limitation of support bolt 301, a gap will remain between manhole door 1 and cylinder 2, preventing the manhole door 1 from being completely closed and causing oxygen deficiency inside the pressure vessel, making it difficult for personnel to open manhole door 1 inside the pressure vessel.

[0036] After maintenance, rotate and retract the support bolt 301 to close the manhole door 1, and reconnect the cylinder 2 and manhole door 1 with bolts. After the manhole door 1 is closed, the sealing ring 106 seals the manhole door 1 and the cylinder 2. At the same time, the sealing sleeve 108 fits tightly with the annular reinforcing rib 201 near the manhole door 1, providing a double seal to ensure a good sealing effect.

[0037] The foregoing has shown and described the basic principles, main features and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are only illustrative of the principles of this utility model. Various changes and modifications may be made to this utility model without departing from the spirit and scope of this utility model, and all such changes and modifications fall within the scope of this utility model as claimed.

Claims

1. A manhole structure for pressure equipment, comprising: The cylindrical body (2) has a connecting frame (103) fixedly connected to its side; Manhole door (1) is used to seal cylinder (2). Manhole door (1) is hinged to connecting frame (103). Manhole door (1) has several connecting holes (102) evenly distributed in a ring. Cylinder (2) has several mating holes corresponding to the connecting holes (102). A handle (104) is also fixedly installed on the outer side of manhole door (1). A sealing ring (106) is installed between the cylinder (2) and the manhole (1) for sealing the cylinder (2); characterized in that a mounting bracket (302) is fixedly connected to the side of the cylinder (2) away from the connecting frame (103), a cam (303) is rotatably mounted on the mounting bracket (302), a hexagonal nut is fixedly connected to the shaft of the cam (303), and an extension plate (105) that cooperates with the cam (303) is fixedly connected to the position of the manhole (1) corresponding to the cam (303).

2. The manhole structure for pressure equipment according to claim 1, characterized in that: The mounting bracket (302) is also threaded with a support bolt (301) for preventing the manhole door (1) from closing.

3. The manhole structure for pressure equipment according to claim 1, characterized in that: The cylinder (2) has several annular reinforcing ribs (201) integrally formed inside, which are used to reduce the deformation of the cylinder (2).

4. The manhole structure for pressure equipment according to claim 3, characterized in that: The inner side of the manhole door (1) is integrally formed with an annular protrusion (107), and a sealing sleeve (108) is fitted on the annular protrusion (107).

5. The manhole structure for pressure equipment according to claim 1, characterized in that: The outer side of the manhole door (1) is fixedly connected with several strip-shaped reinforcing ribs (101).

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