Manhole structure of large storage tank for chemical fertilizer production

Abstract

A manhole structure of a large storage tank for chemical fertilizer production comprises a connecting pipe arranged on the outer circumferential face of the storage tank, a connecting flange is arranged at the end of the connecting pipe, a blind plate is installed on the connecting flange through a bolt and seals the end of the connecting pipe, and a distance ring is further installed between the connecting flange and the blind plate. Sealing ring grooves are formed in the end faces of the two sides of the distance ring respectively, and the sealing rings are installed in the sealing ring grooves. The spacer ring is installed between the connecting flange and the blind plate, the sealing ring grooves are formed in the end faces of the two sides of the spacer ring respectively, the sealing rings are installed in the sealing ring grooves to seal the connecting flange and the blind plate, a rubber plate does not need to be used for cutting a rubber pad, the weight is increased on the spacer ring, and the spacer ring and the sealing rings can be sequentially installed during installation. And on-site operation disassembly and assembly are convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of storage tanks, in particular to a maintenance hole structure of a large storage tank for fertilizer production. Background Art

[0002] In the fertilizer production plant, there are many large storage tanks for containing liquids. Inspection holes are set on the lower side of the outer wall of these storage tanks. During inspection, personnel can enter the storage tank through the inspection holes. The current inspection hole structure includes a connecting pipe, a connecting flange and a blind plate. One end of the connecting pipe is connected to the storage tank, and the other end is equipped with a connecting flange. The blind plate is installed on the connecting flange by bolts to close the connecting pipe. The blind plate and the connecting flange are sealed by a rubber pad.

[0003] When the rubber pad leaks or after the internal maintenance of the tank, it is necessary to replace the rubber pad. The current rubber pad is cut from the rubber plate. Since the inner diameter of the connecting flange is large, generally Φ600, and the rubber pad is annular, each time the rubber pad is cut, at least Φ600 of the circular rubber plate residue will be left, which is not only troublesome to cut, but also wastes a lot of rubber plates. Therefore, it is necessary to improve the sealing structure of the inspection hole of the tank.

[0004] There are several improvement schemes at present. One is to process the sealing ring groove directly on the side of the blind plate, and install the sealing ring in the sealing ring groove to achieve the sealing between the blind plate and the connecting flange. However, the thickness of the blind plate used on site is 12mm. After processing the sealing ring groove of a certain depth on the existing blind plate, the structural strength of the blind plate will be reduced, and it is easy to deform during installation. In addition, there is no lathe capable of processing circular plates of Φ700 and above around the factory area. The second is to thicken the blind plate and re-purchase the blind plate with the sealing ring groove. However, when this scheme is adopted, the thickness of the blind plate is about 20mm. Taking the inspection hole with an inner diameter of Φ600 as an example, the outer diameter of the blind plate is Φ700mm, and the weight of the whole blind plate is about 60Kg. The weight of the blind plate is about 36kg when the thickness of 12mm is about 36kg, which is 24Kg more in weight. Since the operation site is outdoors, two people work in a group, and there is no lifting equipment on site, it is inconvenient to disassemble and assemble on site. Therefore, the inventor proposes the large storage tank inspection hole structure of this application to improve the existing storage tank inspection hole structure. Utility Model Content

[0005] The technical problem to be solved by the utility model is: to solve the problems existing in the above-mentioned background technology, and to provide a maintenance hole structure for a large-scale storage tank for fertilizer production, by installing a spacer ring between the connecting flange and the blind plate, sealing ring grooves are respectively arranged on the end faces on both sides of the spacer ring, and sealing rings are installed in the sealing ring grooves to seal the connecting flange and the blind plate, and there is no need to cut the rubber pad with a rubber plate, and the added weight is on the spacer ring, which can be installed in sequence during installation, and it is also convenient to disassemble and assemble on site.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is: a maintenance hole structure for a large-scale storage tank for fertilizer production, including a connecting pipe arranged on the outer circumferential surface of the storage tank, a connecting flange is arranged at the end of the connecting pipe, a blind plate is installed on the connecting flange by bolts, the blind plate closes the end of the connecting pipe, and a spacer ring is also installed between the connecting flange and the blind plate, and sealing ring grooves are respectively arranged on the end faces on both sides of the spacer ring, and the sealing ring is installed in the sealing ring groove.

[0007] A fixing device is installed on the spacer ring.

[0008] The fixing device is a hook fixed on the outer circumference of the spacer ring, and the hook is hung on the connecting flange to fix the spacer ring.

[0009] The fixing device is a sleeve fixed in the bolt hole of the spacer ring. The sleeve extends to one side of the connecting flange and penetrates into the bolt hole of the connecting flange to fix the spacer ring.

[0010] Two sealing ring grooves are respectively arranged on both sides of the spacer ring.

[0011] The sealing ring is an O-ring or a sealing tape.

[0012] The utility model has the following beneficial effects:

[0013] 1. The utility model installs a spacer ring between the connecting flange and the blind plate, and sealing ring grooves are respectively arranged on the end faces of both sides of the spacer ring. Sealing rings are installed in the sealing ring grooves to seal the connecting flange and the blind plate. There is no need to cut the rubber pad with a rubber plate, and the added weight is on the spacer ring. The spacer ring can be installed in sequence during installation, and it is also convenient to disassemble and assemble on site.

[0014] 2. The utility model realizes the sequential installation of the spacer ring and the blind plate by installing a fixing device on the spacer ring.

[0015] 3. The utility model is particularly suitable for improving the existing storage tank inspection hole structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0017] Figure 1 This is a schematic diagram of the main structure of the inspection hole.

[0018] Figure 2 for Figure 1 Schematic diagram of the AA section structure.

[0019] Figure 3 This is a schematic diagram of the installation state when the fixing device of the utility model is a sleeve.

[0020] Figure 4It is a schematic diagram of the three-dimensional structure when a hook is arranged on the spacer ring of the utility model.

[0021] Figure 5 It is a three-dimensional structural schematic diagram of the utility model when a sleeve is arranged on the spacer ring.

[0022] In the figure:

[0023] Connecting pipe 1, connecting flange 11, blind plate 2, spacer ring 3, sealing ring groove 31, fixing device 32, bolt 4, sealing ring 5. DETAILED DESCRIPTION

[0024] like Figure 1-5 As shown, a manhole structure for a large storage tank for fertilizer production includes a connecting pipe 1 arranged on the outer circumferential surface of the storage tank, a connecting flange 11 is arranged at the end of the connecting pipe 1, a blind plate 2 is installed on the connecting flange 11 by bolts 4, and the blind plate 2 closes the end of the connecting pipe 1, and a spacer ring 3 is also installed between the connecting flange 11 and the blind plate 2, and sealing ring grooves 31 are respectively arranged on both side end faces of the spacer ring 3, and a sealing ring 5 is installed in the sealing ring groove 31. By installing the spacer ring 3 between the connecting flange 11 and the blind plate 2, the sealing ring grooves 31 are respectively arranged on both side end faces of the spacer ring 3, and the sealing ring 5 is installed in the sealing ring groove 31 to seal the connecting flange and the blind plate, there is no need to use a rubber plate to cut the rubber pad, and the added weight is on the spacer ring, which can be installed in sequence during installation, and it is also convenient to disassemble and assemble on site.

[0025] Furthermore, in order to facilitate the installation of the spacer ring 3 , a fixing device 32 is installed on the spacer ring 3 to achieve the sequential installation of the spacer ring 3 and the blind plate 2 .

[0026] In the first embodiment, see Figure 4 The fixing device 32 is a hook fixed on the outer circumference of the spacer ring 3, and the hook is hung on the connecting flange 11 to fix the spacer ring 3. Specifically, two hooks are provided. During installation, after the sealing ring is installed on the spacer ring 3, the spacer ring 3 is hung on the connecting flange 11 through the hook. When installing the blind plate 2, there is no need to lift the spacer ring 3 separately.

[0027] In the second embodiment, see Figure 5 The fixing device 32 is a sleeve fixed in the bolt hole of the spacer ring 3, the sleeve extends to one side of the connecting flange 11, and the sleeve penetrates into the bolt hole of the connecting flange 11 to fix the spacer ring 3. Figure 3 When installing the spacer ring 3, first insert the sleeve into the bolt hole of the connecting flange 11, and connect the spacer ring 3 to the connecting flange 11. In this way, when installing the blind plate, there is no need to lift the spacer ring 3 separately. When installing the bolt 4, the bolt 4 is inserted into the sleeve, which does not affect the installation of the bolt 4. Specifically, 2-4 sleeves are set.

[0028] See also Figure 3Two sealing ring grooves 31 are respectively arranged on both sides of the spacer ring 3.

[0029] See also Figure 4 A sealing ring groove 31 is respectively provided on both sides of the spacer ring 3.

[0030] Preferably, the sealing ring 5 is an O-ring or a sealing tape. The O-ring is a finished product, and the sealing tape is a rubber strip cut at an angle and bonded into a ring shape.

[0031] The action process or principle of the utility model is as follows:

[0032] When the fixing device 32 is not provided on the spacer ring 3, during installation, the sealing ring 5 is installed on the spacer ring 3, and the sealing ring 5 can be glued in the sealing ring groove 31. A screw is inserted into the bolt hole at the uppermost end of the connecting flange 11, and the spacer ring 3 is inserted into the screw facing the connecting flange 11, so that the spacer ring 3 is suspended by the screw. Then one person picks up the blind plate 2 and inserts it into the screw, and another person installs other screws, and finally screws on the nut to complete the installation of the inspection hole.

[0033] When the fixing device 32 provided on the spacer ring 3 is a hook, during installation, after the sealing ring is installed on the spacer ring 3, the spacer ring 3 is hung on the connecting flange 11 by the hook, and the spacer ring 3 is rotated and adjusted to align the bolt holes. Then one person lifts the blind plate 2 to align the spacer ring 3, and another person installs the screw, and finally the nut is installed to complete the installation of the inspection hole.

[0034] When the fixing device 32 provided on the spacer ring 3 is a sleeve, during installation, after the sealing ring is installed on the spacer ring 3, the sleeve is first inserted into the bolt hole of the connecting flange 11. At this time, the bolt holes of the spacer ring 3 and the connecting flange 11 are already aligned. Then one person lifts the blind plate 2 to align the spacer ring 3, and the other person installs the screw, and finally installs the nut to complete the installation of the inspection hole.

Claims

1. A manhole structure for a large storage tank for fertilizer production, comprising a connecting pipe (1) arranged on the outer circumferential surface of the storage tank, a connecting flange (11) being arranged at the end of the connecting pipe (1), a blind plate (2) being mounted on the connecting flange (11) by means of bolts (4), the blind plate (2) sealing the end of the connecting pipe (1), characterized in that: A spacer ring (3) is also installed between the connecting flange (11) and the blind plate (2). Sealing ring grooves (31) are respectively provided on both side end surfaces of the spacer ring (3), and the sealing ring (5) is installed in the sealing ring groove (31).

2. The inspection hole structure of a large storage tank for fertilizer production according to claim 1 is characterized in that: A fixing device (32) is installed on the spacer ring (3).

3. The inspection hole structure of a large storage tank for fertilizer production according to claim 2 is characterized in that: The fixing device (32) is a hook fixedly arranged on the outer circumference of the spacer ring (3), and the hook is hung on the connecting flange (11) to fix the spacer ring (3).

4. The inspection hole structure of a large storage tank for fertilizer production according to claim 2 is characterized in that: The fixing device (32) is a sleeve fixed in the bolt hole of the spacer ring (3), the sleeve extending toward one side of the connecting flange (11), and the sleeve penetrates into the bolt hole of the connecting flange (11) to fix the spacer ring (3).

5. The inspection hole structure of a large storage tank for fertilizer production according to claim 1 is characterized by: Two sealing ring grooves (31) are respectively arranged on both sides of the spacer ring (3).

6. The inspection hole structure of a large storage tank for fertilizer production according to claim 1 is characterized in that: The sealing ring (5) is an O-ring or a sealing tape.

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