YAA manhole for tank

Abstract

The utility model relates to a YAA manhole for a tank, which comprises an adapter disc, a manhole cover, a screw piece and a sealing ring, the adapter disc is rotatably connected with the manhole cover through a hinge, the adapter disc is provided with threaded columns which are circumferentially distributed and are used for connecting the screw piece, the manhole cover is in threaded connection with the adapter disc through the screw piece, one end of the screw piece is provided with a hand wheel, and the other end of the screw piece is provided with a sealing ring. The switching disc is provided with a sealing face, a dovetail groove used for being connected with the sealing ring in a clamped mode is formed in the side, facing the sealing face, of the manhole cover, and the manhole cover is connected to the switching disc in a sealed mode through the sealing ring. The main purpose of the utility model is that the sealing ring is always clamped at the dovetail groove of the manhole cover, when the manhole cover is opened or closed or a screw piece is tightened through a hand wheel, the sealing ring can be effectively prevented from being dislocated or falling off, the air tightness between the switching disc and the manhole cover is maintained, and the top cover of the switching disc is a plane easy to clean, so that the sealing ring is not easy to clean. Materials in the tank are effectively prevented from being polluted and deteriorated.

Description

Technical Field

[0001] The utility model relates to the technical field of safety valves, in particular to a YAA manhole for a tank. Background Art

[0002] A manhole is an opening structure used for personnel to enter and exit the tank body and for installation and maintenance. It includes an adapter plate and a manhole cover hinged to the top of the adapter plate. The YAA manhole is a sanitary-grade manhole for tank bodies, commonly used to place materials such as milk, beverages, wine, medicine, biology, and cosmetics. The YAA manhole will be provided with a sealing groove on the adapter plate for clamping the sealing ring to improve the sealing effect of the tank body and enable it to be used normally in a pressurized or negative pressure environment. However, when the manhole cover is opened or closed, the sealing ring is squeezed and easily detached from the sealing groove, seriously affecting the sealing effect of the tank body, causing external impurities to enter and contaminate the materials in the tank. Utility Model Content

[0003] In order to overcome the shortcomings of the background technology, the technical solution adopted by the utility model is: a YAA manhole for a tank, including an adapter plate, a manhole cover, a screw part and a sealing ring. The adapter plate is rotatably connected to the manhole cover through a hinge. The adapter plate is provided with threaded columns distributed in a circle for connecting the screw parts. The manhole cover is threadedly connected to the adapter plate through the screw parts, and a handwheel is provided at one end of the screw part. The adapter plate is provided with a sealing surface, and a dovetail groove for clamping the sealing ring is provided on the side of the manhole cover facing the sealing surface. The manhole cover is sealed to the adapter plate through the sealing ring.

[0004] By adopting the above technical solution, the sealing ring is always clamped in the dovetail groove of the manhole cover. When the manhole cover is opened or closed or the screws are tightened by the handwheel, the sealing ring can be effectively prevented from being dislocated or falling off, maintaining the air tightness between the adapter plate and the manhole cover. The top cover of the adapter plate is a flat surface that is easy to clean, which effectively prevents the material in the tank from deteriorating.

[0005] The present invention is further configured such that the adapter plate is provided with a welding pipe for externally connecting the tank body, the top surface of the welding pipe is the sealing surface, and the threaded columns are distributed circumferentially on the sealing surface.

[0006] Furthermore, the sealing ring is provided with a clamping portion corresponding to the dovetail groove, and an arc portion for abutting the sealing surface, and a deformation groove is provided at the center of the sealing ring.

[0007] Furthermore, the deformation groove includes a trapezoidal groove located between the two groups of clamping parts, and an elliptical groove connected to the trapezoidal groove.

[0008] By adopting the above technical solution, when installing the sealing ring, the clamping part on one side of the sealing ring is first inserted into the dovetail groove, and the clamping part on the other side is squeezed, so that the trapezoidal groove is deformed and shrinks to a size sufficient to clamp the two clamping parts into the dovetail groove. When the sealing ring is inserted into the dovetail groove, the two sets of clamping parts are naturally filled into the inverted triangular groove of the dovetail groove, making the sealing ring easy to disassemble and assemble and easy to clean; when the manhole cover is closed, the arc part squeezes the sealing surface, causing the elliptical groove to be compressed, and the air pressure in the trapezoidal groove to increase, thereby improving the sealing effect of the clamping part and the dovetail groove.

[0009] The present invention is further configured such that the sealing surface is perpendicular to the axis of the adapter plate.

[0010] The present invention is further configured such that the sealing surface is inclined upward toward the axis of the adapter plate.

[0011] Compared with the prior art, the beneficial effects of the present invention are:

[0012] 1. The sealing ring is always clamped in the dovetail groove of the manhole cover. When opening or closing the manhole cover or tightening the screws with the handwheel, it can effectively prevent the sealing ring from being dislocated or falling off, and maintain the airtightness between the adapter plate and the manhole cover;

[0013] 2. The top cover of the transfer tray is a flat surface that is easy to clean, effectively preventing the material in the tank from being contaminated and deteriorating.

[0014] The embodiments of the present invention will be further described below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a top view of the utility model;

[0016] Figure 2 This is the main view of the utility model;

[0017] Figure 3 For the utility model Figure 2 A partial cross-sectional view of the first embodiment in the direction of the inner A;

[0018] Figure 4 It is a cross-sectional view of the sealing ring cross section of the present utility model;

[0019] Figure 5 For the utility model Figure 2 A partial cross-sectional view of the second embodiment in the direction of the inner A;

[0020] Among them: 1-adapter plate, 2-manhole cover, 3-screw, 4-sealing ring, 5-threaded column, 6-mounting hole, 7-handwheel, 8-welded pipe, 11-sealing surface, 12-dovetail groove, 13-clamping part, 14-arc part, 15-deformation groove, 16-trapezoidal groove, 17-elliptical groove; DETAILED DESCRIPTION

[0021] like Figure 1-4 As shown, this embodiment provides a first embodiment of a YAA manhole for a tank, comprising an adapter plate 1, a manhole cover 2, a screw member 3 and a sealing ring 4. The adapter plate 1 is rotatably connected to the manhole cover 2 via a hinge. The adapter plate 1 is provided with six groups of circumferentially distributed threaded columns 5 for connecting the screw members 3. The manhole cover 2 is provided with mounting holes 6 adapted to the threaded columns 5 and is threadedly connected to the adapter plate 1 via the screw member 3. One end of the screw member 3 is provided with a handwheel 7 for manually opening and closing the manhole cover 2. The adapter plate 1 is provided with a welding pipe 8 for externally connecting the tank body. The inner wall of the welding pipe 8 is mirror polished. The top surface of the welded pipe 8 is a sealing surface 11, which is perpendicular to the axis of the adapter plate 1. A dovetail groove 12 for clamping the sealing ring 4 is provided on the side of the manhole cover 2 facing the sealing surface 11. The manhole cover 2 is sealed to the adapter plate 1 through the sealing ring 4. The threaded columns 5 are circumferentially distributed on the sealing surface 11. The sealing ring 4 is provided with a clamping portion 13 corresponding to the dovetail groove 12, and an arc portion 14 for abutting the sealing surface 11, and a deformation groove 15 is provided at the center of the sealing ring 4. The deformation groove 15 includes a trapezoidal groove 16 located between the two groups of clamping portions 13, and an elliptical groove 17 connected to the trapezoidal groove 16.

[0022] Combine Figure 1 、 2 As shown in Figures 4 and 5, the present invention provides a second embodiment of a YAA manhole for a tank, comprising an adapter plate 1, a manhole cover 2, a screw member 3 and a sealing ring 4. The adapter plate 1 is rotatably connected to the manhole cover 2 via a hinge. The adapter plate 1 is provided with six groups of threaded columns 5 for connecting the screw members 3 and are distributed circumferentially. The manhole cover 2 is provided with mounting holes 6 that match the threaded columns 5 and is threadedly connected to the adapter plate 1 via the screw member 3. One end of the screw member 3 is provided with a handwheel 7 for manually opening and closing the manhole cover 2. The adapter plate 1 is provided with a welding pipe 8 for externally connecting the tank body. The inner wall of the welding pipe 8 is mirror polished. The welding pipe 8 The top surface is a sealing surface 11, which is inclined upward toward the axis of the adapter plate 1. A dovetail groove 12 for clamping the sealing ring 4 is provided on the side of the manhole cover 2 facing the sealing surface 11. The manhole cover 2 is sealed to the adapter plate 1 through the sealing ring 4. The threaded columns 5 are circumferentially distributed on the sealing surface 11. The sealing ring 4 is provided with a clamping portion 13 corresponding to the dovetail groove 12, and an arc portion 14 for abutting the sealing surface 11, and a deformation groove 15 is provided at the center of the sealing ring 4. The deformation groove 15 includes a trapezoidal groove 16 located between the two groups of clamping portions 13, and an elliptical groove 17 connected to the trapezoidal groove 16.

[0023] In the present invention, the trapezoidal groove 16 is connected with the elliptical groove 17, which is beneficial for the demoulding of the sealing ring 4 after injection molding. When installing the sealing ring 4, the clamping portion 13 on one side of the sealing ring 4 is first clamped into the dovetail groove 12, and the clamping portion 13 on the other side is squeezed, so that the trapezoidal groove 16 is deformed and contracted to a size sufficient to clamp the two clamping portions 13 into the dovetail groove 12. When the sealing ring 4 is clamped into the dovetail groove 12, the two sets of clamping portions 13 naturally fill the inverted triangular groove of the dovetail groove 12. When the manhole cover 2 is closed, the arc The portion 14 squeezes the sealing surface 11, causing the elliptical groove 17 to be compressed. At this time, the air pressure in the trapezoidal groove 16 increases, thereby improving the sealing effect between the clamping portion 13 and the dovetail groove 12. Since the sealing ring 4 is always clamped at the dovetail groove 12 of the manhole cover 2, when the manhole cover 2 is opened and closed or the screw member 3 is tightened by the handwheel 7, the sealing ring 4 can be effectively prevented from being dislocated or falling off, thereby maintaining the airtightness between the adapter plate 1 and the manhole cover 2. In addition, the top cover of the adapter plate 1 is a flat surface that is easy to clean, thereby effectively preventing the material in the tank from deteriorating.

[0024] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A YAA manhole for a tank, characterized in that: The invention comprises an adapter plate (1), a manhole cover (2), a screw member (3) and a sealing ring (4); the adapter plate (1) is rotatably connected to the manhole cover (2) via a hinge; the adapter plate (1) is provided with threaded columns (5) for connecting the screw member (3) and distributed in a circumferential manner; the manhole cover (2) is threadedly connected to the adapter plate (1) via the screw member (3); one end of the screw member (3) is provided with a hand wheel (7); the adapter plate (1) is provided with a sealing surface (11); a dovetail groove (12) for clamping the sealing ring (4) is provided on a side of the manhole cover (2) facing the sealing surface (11); and the manhole cover (2) is sealingly connected to the adapter plate (1) via the sealing ring (4).

2. The YAA manhole for a tank according to claim 1, characterized in that: The adapter plate (1) is provided with a welding pipe (8) for externally connecting the tank body, the top surface of the welding pipe (8) is the sealing surface (11), and the threaded columns (5) are circumferentially distributed on the sealing surface (11).

3. The YAA manhole for a tank according to claim 2, characterized in that: The sealing ring (4) is provided with a clamping portion (13) corresponding to the dovetail groove (12), and an arc portion (14) for abutting against the sealing surface (11), and a deformation groove (15) is provided at the center of the sealing ring (4).

4. The YAA manhole for a tank according to claim 3, characterized in that: The deformation groove (15) comprises a trapezoidal groove (16) located between the two groups of clamping parts (13), and an elliptical groove (17) connected to the trapezoidal groove (16).

5. The YAA manhole for a tank according to claim 1, characterized in that: The sealing surface (11) is perpendicular to the axis of the adapter plate (1).

6. The YAA manhole for a tank according to claim 1, characterized in that: The sealing surface (11) is inclined upwards toward the axis of the adapter plate (1).

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