B30 welding type end cover suitable for marine shell-and-tube condenser

Abstract

The invention relates to a B30 welded end cover suitable for a marine shell-and-tube condenser, which comprises a left end cover and a right end cover, and the left end cover and the right end cover adopt B30 plates to form a left cover body and a right cover body through cutting, folding, splicing and welding; a pipe connecting flange and an anti-corrosion block assembly are arranged on the left cover body, a rib plate is arranged in the left cover body, baffles are arranged on the two sides, and a square flange is welded to the bottom; the right cover body is welded with an anti-corrosion block assembly and a welding seat, a rib plate is arranged in the right cover body, baffles are arranged on two sides, and a square flange is welded at the bottom. The end cover is formed by cutting, folding, splicing and welding a B30 plate, the production process is simpler than that of a cast end cover, the production time is shortened, and the rejection rate is reduced. When the anti-corrosion block is replaced, a water drain valve of the shell-and-tube condenser can be opened firstly to drain all seawater, the anti-corrosion block is replaced under the condition that the end cover is not disassembled, and maintenance operation is convenient. A mechanical structure is adopted for sealing, the end cover can be stably used for a long time, and the reliability and the service life of the end cover are improved.

Description

Technical Field

[0001] The invention relates to an end cover structure in a marine shell and tube condenser, in particular to a welded end cover suitable for a marine shell and tube condenser. Background Art

[0002] Shell and tube condensers are widely used in marine air conditioners, chillers and refrigeration units, and are important components of marine equipment. The tube-side fluid of the shell and tube condenser is generally seawater, and the shell-side fluid is generally air or refrigerant. At present, for shell and tube heat exchangers with seawater as the tube-side fluid, most of the end covers are cast as a whole with aluminum bronze (ZCuA19Mn2), and their structural design, production process and assembly level are relatively mature. After the end cover is cast, the oxide scale, sand inclusions, scars, burrs, etc. will be removed to ensure that the surface of the end cover is clean and smooth; the unprocessed surface of the end cover casting should not have cracks, cold insulation, sand holes that affect the strength, performance and life, and should not be deformed and damaged, and should not be welded; the end cover needs to be subjected to a water pressure strength test after processing, and the pressure holding time should not be less than 30 minutes, and there should be no leakage.

[0003] On board, the actual working environment of the shell and tube condenser has long-term pitch, long-term roll, pitch, roll, salt spray, impact and vibration, and the seawater itself is corrosive to a certain extent. The shell and tube condenser uses aluminum bronze (ZCuA19Mn2) cast end covers. Due to the possibility of cracks, cold shuts, sand holes and other problems, there are many unqualified end covers in the production process. If the finished end cover contains some very small cracks or sand holes, in the actual marine working environment, the seawater constantly vibrates and impacts the end cover, which will reduce the service life of the casting end cover. If the casting end cover is used for more than 5 years, small cracks or sand holes may evolve into large cracks and sand holes, which will cause the end cover to leak and be scrapped. At present, there have been cases of leakage in the end cover of marine shell and tube condensers. Therefore, under normal circumstances, the relevant support base will use the end cover as a spare part.

[0004] In summary, considering the end cover processing and production technology, harsh marine conditions, anti-corrosion and anti-leakage, maintenance space and service life requirements, it is necessary to develop a B30 welded end cover suitable for marine shell and tube condensers. Summary of the invention

[0005] Aiming at the actual marine working environment, anti-corrosion and anti-leakage, maintenance space and service life requirements, the present invention proposes a B30 welded end cover suitable for marine shell and tube condensers, the purpose of which is to shorten the end cover production time, reduce the scrap rate of the end cover, and improve the reliability and service life of the end cover.

[0006] To achieve the above-mentioned purpose, the technical solution of the present invention is: a B30 welded end cover suitable for a marine shell and tube condenser, comprising a left end cover and a right end cover, both of which are made of B30 plates through cutting, folding, assembling and welding to form a left cover body and a right cover body; the left cover body is provided with a connecting pipe flange and an anti-corrosion block assembly, a rib plate is provided inside, baffles are provided on both sides, and a square flange is welded on the bottom; the right cover body is welded with an anti-corrosion block assembly and a welding seat, a rib plate is provided inside, baffles are provided on both sides, and a square flange is welded on the bottom.

[0007] Furthermore, the square flange is cut from a whole piece of B30 plate.

[0008] Furthermore, the rib plate is cut from the B30 plate and welded to the inner side of the cover body to form a compartment.

[0009] Furthermore, the baffle is cut from B30 plate and welded to both sides of the cover body.

[0010] Furthermore, grooves are reserved on the inner side of the flange for welding with the cover body, the rib plate and the baffle.

[0011] The beneficial effects of the present invention are:

[0012] The B30 welded end cover suitable for a marine shell and tube condenser proposed by the present invention has the following advantages:

[0013] (1) The end cover is cut, folded, assembled and welded with B30 plate. The production process is simpler than that of the cast end cover, the production time is shortened, and the scrap rate is reduced.

[0014] (2) After long-term use, if the B30 welded end cover has local leakage, it can be disassembled and repaired by welding. The operation is simple, the maintenance time is short, and the end cover can be reused.

[0015] (3) When replacing the anti-corrosion block, you can first open the drain valve of the shell and tube condenser to drain the seawater, and then replace the anti-corrosion block without removing the end cover, which is convenient for maintenance and operation.

[0016] (4) With mechanical structural sealing, the B30 welded end cover can be used stably for a long time, which improves the reliability and service life of the end cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of the left end cover of the B30 welded end cover suitable for a marine shell and tube condenser of the present invention;

[0018] Figure 2 It is a schematic structural diagram of the right end cover of the B30 welded end cover suitable for a marine shell and tube condenser of the present invention;

[0019] Figure 1Middle: 1-cover, 2-pipe flange, 3-rib plate, 4-corrosion block assembly, 5-baffle, 6-square flange, 7-welding seat. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0021] The B30 welded end cover suitable for a marine shell and tube condenser proposed in the present invention is divided into a left end cover and a right end cover.

[0022] Left end cover structure, such as Figure 1 As shown, it includes a cover body 1, a pipe flange 2, a rib plate 3, an anti-corrosion block assembly 4, a baffle 5, and a square flange 6. The cover body 1 is welded with a pipe flange 2 and an anti-corrosion block assembly 4, a rib plate 3 is arranged inside, baffles 5 are welded on both sides, and a square flange 6 is welded on the bottom.

[0023] The right end cover structure, such as Figure 2 As shown, it includes a cover body 1, a rib plate 3, an anti-corrosion block assembly 4, a baffle plate 5, a square flange 6, and a welding seat 7. The anti-corrosion block assembly 4 and the welding seat 7 are welded on the cover body 1, a rib plate 3 is arranged inside, baffle plates 5 are welded on both sides, and a square flange 6 is welded on the bottom.

[0024] The end cap material is B30, the cap body is cut and folded from B30 plate, the flange 6 is cut from a whole piece of B30 plate, the rib plate 3 is cut from B30 plate and welded to the inner side of the cap body to form a compartment, and the baffle 5 is cut from B30 plate and welded to both sides of the cap body. To ensure the sealing of the end cap, the inner side of the flange 6 is provided with grooves for welding with the cap body, rib plate and baffle. Specific embodiment:

[0026] The cover body 1, flange 6, rib plate 3 and baffle plate 5 are all made of B30 plate, which are cut and folded, and finally assembled and welded into the end cover. The inner side of the end cover is arranged with a compartment formed by the rib plate to ensure that seawater flows back and forth in the end cover. Baffle plates are arranged on both sides of the end cover to provide a stable space for the flow of seawater. The end cover is arranged with an anti-corrosion block assembly, which can be easily replaced.

Claims

1. A B30 welded end cover suitable for marine shell and tube condensers, characterized in that: It includes a left end cover and a right end cover, and both of the left end cover and the right end cover are formed by cutting, folding, assembling and welding B30 plates to form a left cover body and a right cover body; the left cover body is provided with a connecting flange and an anti-corrosion block assembly, a rib plate is provided inside, baffles are provided on both sides, and a square flange is welded on the bottom; the right cover body is welded with an anti-corrosion block assembly and a welding seat, a rib plate is provided inside, baffles are provided on both sides, and a square flange is welded on the bottom.

2. The B30 welded end cover suitable for marine shell and tube condenser according to claim 1, characterized in that: The square flange is cut from a whole piece of B30 plate.

3. The B30 welded end cover suitable for marine shell and tube condenser according to claim 1, characterized in that: The rib plate is cut from B30 plate and welded to the inner side of the cover to form a compartment.

4. The B30 welded end cover suitable for marine shell and tube condenser according to claim 1, characterized in that: The baffle is cut from B30 plate and welded on both sides of the cover.

5. The B30 welded end cover suitable for marine shell and tube condenser according to claim 1, characterized in that: There are grooves on the inner side of the flange for welding to the cover, rib plate and baffle.

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