Disassembly-free duplex blind flange

Abstract

The utility model belongs to the technical field of ship construction, and particularly discloses a disassembly-free duplex blind flange. The problem that disassembly and installation are difficult when different forms of the duplex blind flange are switched at present is effectively solved. The number of the bolt holes in the duplex blind flange is 37, the bolt holes comprise kidney-shaped round holes and round holes, the number of the kidney-shaped round holes is 2, and the number of the round holes is 35. A round hole shared by the two ends of the duplex blind plate flange is formed between the two kidney-shaped round holes, and a bolt in the round hole shared by the two ends of the duplex blind plate flange serves as a rotating shaft when the duplex blind plate flange is switched. According to the utility model, complete disassembly is not needed during switching, and one bolt is reserved in the switching process of the duplex blind flange, so that the repositioning difficulty is reduced, the potential safety hazard in the operation process is avoided, and the construction time is effectively shortened.

Description

A non-disassembly double blind flange Technical Field

[0001] This utility model belongs to the field of shipbuilding technology, and in particular relates to a non-disassembly double blind flange. Background Technology

[0002] A double blind flange consists of a solid circle and a hollow circle, resembling a pair of eyeglasses. One end functions as a flange, while the other acts as a blind flange. It is used in ships to seal pipelines or equipment openings, changing the fluid state by switching the double blind flange. Currently, when switching a double blind flange, protective measures must be taken beforehand. All fixing bolts must be removed, and the flange must be lifted using appropriate lifting tools. After switching to the other end, the bolt holes of the double blind flange must be repositioned using appropriate lifting tools, and the previously removed bolts must be installed.

[0003] The existing double blind flange (GB / T 4450-2008) has two drawbacks: (1) Double blind flanges suitable for large-diameter pipelines are relatively heavy. For example, the weight of a PN10 DN600 double blind flange is about 150kg. It is difficult to operate and has a high risk factor when disassembling the double blind flange; (2) When the double blind flange is disassembled and reinstalled, it is difficult to align the bolt holes with the original pipeline flange. Summary of the Invention

[0004] The purpose of this utility model is to provide a non-disassembly double blind flange, which effectively solves the problem of difficult disassembly and installation when switching between different forms of double blind flanges.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] A non-removable double blind flange, wherein the double blind flange has a total of 37 bolt holes, the bolt holes including oblong holes and round holes, wherein there are 2 oblong holes and 35 round holes.

[0007] Between the two oval holes is a circular hole shared by both ends of the double blind flange, and the bolt in the circular hole shared by both ends of the double blind flange serves as a rotation shaft when the double blind flange is switched.

[0008] Furthermore, the nominal pressure of the double blind flange is 1.0 MPa, and the nominal diameter of the double blind flange is 600 mm.

[0009] Furthermore, the diameter of the circular hole is 30 mm.

[0010] Furthermore, the length of the oval hole is 65mm.

[0011] Furthermore, the distance between the common circular hole at both ends of the double blind flange and the two oblong holes is equal.

[0012] Compared with the prior art, the beneficial technical effects of this utility model are:

[0013] (1) The double blind flange of this utility model does not need to be completely disassembled during switching. Furthermore, because a bolt is retained during the switching process of the double blind flange, the difficulty of repositioning the bolt hole of the double blind flange is reduced, the number of operators is reduced, the operation steps are simplified, safety hazards during operation are avoided, and the construction time is effectively shortened.

[0014] (2) This utility model effectively broadens the application scope of double blind flanges. At the same time, the structural design of this utility model reduces the operational difficulty when switching double blind flanges (especially double blind flanges applicable to large-diameter pipelines) and improves the safety factor of double blind flanges during operation. Attached Figure Description

[0015] Figure 1 is a schematic diagram of the structure of Embodiment 1.

[0016] Figure 2 is a cross-sectional view of Figure 1 along line AA.

[0017] Explanation of reference numerals in the attached diagram: Circular hole-1; First oblong hole-2; Second oblong hole-3; Common circular hole-4. Detailed Implementation

[0018] Example 1: A non-removable double blind flange, as shown in Figures 1 and 2, has a nominal pressure (PN) of 1.0 MPa and a nominal diameter (DN) of 600 mm. The double blind flange has a total of 37 bolt holes. These bolt holes include two oblong holes and 35 round holes (1). In this example, the diameter of the round hole (1) is 30 mm, and the length of the oblong hole is 65 mm.

[0019] Between the two oblong holes is a common circular hole shared by both ends of the double blind flange. For ease of description, the two oblong holes are named the first oblong hole 2 and the second oblong hole 3, and the common circular hole is named the common circular hole 4. The distance between the common circular hole 4 and the first oblong hole 2 and the second oblong hole 3 is equal, meaning that the centers of the common circular hole 4, the first oblong hole 2, and the second oblong hole 3 are on a straight line. The bolt in the common circular hole 4 serves as a pivot for rotating the double blind flange during switching. When switching between different forms of the double blind flange, all bolts except the bolt in the common circular hole 4 are removed, while the nuts on the bolt in the common circular hole 4 are loosened only slightly. Using this as a pivot, the double blind flange is rotated 180°, and then the previously removed bolts are reinstalled.

[0020] The double blind flange (DN600) in this embodiment is larger than the maximum specification (DN500) in GB / T 4450-2008. Therefore, this invention can broaden the application range of double blind flanges. At the same time, the structural design of this invention reduces the operational difficulty when switching double blind flanges (especially for large-diameter pipelines), and improves the safety factor of the double blind flange during operation.

[0021] The double blind flange of this utility model avoids the problem of disassembly required by existing double blind flanges during use. Furthermore, because one bolt is retained during the switching process of the double blind flange, the difficulty of repositioning the bolt hole of the double blind flange is reduced, thus avoiding safety hazards during operation and effectively shortening the construction time.

[0022] Of course, the above description is not intended to limit the present utility model, and the present utility model is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should also fall within the protection scope of the present utility model.

Claims

1. A non-disassembly-free double blind flange, characterized in that, The double blind flange has a total of 37 bolt holes, including oblong holes and round holes. There are 2 oblong holes and 35 round holes. Between the two oblong holes, there is a round hole shared by both ends of the double blind flange. The bolt in the round hole shared by both ends of the double blind flange serves as a rotation shaft when the double blind flange is switched.

2. The non-disassembly-free double blind flange according to claim 1, characterized in that, The nominal pressure of the double blind flange is 1.0 MPa, and the nominal diameter of the double blind flange is 600 mm.

3. The non-disassembly-free double blind flange according to claim 1, characterized in that, The diameter of the circular hole is 30mm.

4. The non-disassembly-free double blind flange according to claim 3, characterized in that, The length of the oval hole is 65mm.

5. A non-disassembly-free double blind flange according to claim 1, characterized in that, The distance between the common circular hole at both ends of the double blind flange and the two oblong holes is equal.

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