All-welded plate type heat exchanger pressing plate for nuclear power

Abstract

The utility model discloses an all-welded plate heat exchanger pressing plate for nuclear power, which comprises a base layer with the section matched with a heat exchange core body, a covering layer is respectively arranged on the peripheral edge of the inner side wall of the base layer, and a base plate is arranged in the middle of the base layer. The covering layer is formed by stamping a plate made of the same material as the heat exchange core body and comprises a horizontal folding face and a sealing folding edge which are perpendicular to each other, a thermal stress folding edge protruding towards one side is arranged in the middle of the horizontal folding face, and the protruding direction of the thermal stress folding edge is opposite to the bending direction of the sealing folding edge. The horizontal folding surface is connected with the inner wall of the base layer, and the sealing folding edge is connected with the side edge of the base layer; the base layer is made of a common carbon steel material, and the base plate is made of a common stainless steel material. The manufacturing cost of the heat exchanger is reduced, and the heat exchanger has excellent corrosion resistance, sealing performance, thermal stability and mechanical strength and can meet the high requirement of a nuclear power station for the heat exchanger.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchange equipment, in particular to a fully welded plate heat exchanger pressing plate for nuclear power. Background Art

[0002] The fully welded plate heat exchanger for nuclear power is an important equipment used for cooling and heating in nuclear power plants, and the pressure plate is a key part in the heat exchanger. Its design and manufacturing are crucial to ensure the performance and safety of the heat exchanger. The pressure plate in the nuclear power heat exchanger must meet strict safety standards and design requirements, be able to withstand extreme pressure and temperature conditions, have good corrosion resistance, radiation resistance, good sealing, excellent mechanical properties and fatigue durability, and provide strong guarantee for the long-term stable operation of nuclear power plants.

[0003] In order to meet the process requirements, the pressing plate is usually made of high-strength, high-corrosion-resistant metal materials, such as stainless steel and nickel-based alloy, which makes the production cost of the pressing plate relatively high. Utility Model Content

[0004] The utility model aims to provide a fully welded plate heat exchanger pressure plate for nuclear power, by installing a coating and a pad on the base of the pressure plate, the base, coating and pad are made of different materials, and are assembled in pieces, so as to reduce the manufacturing cost of the pressure plate.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A fully welded plate heat exchanger pressure plate for nuclear power, comprising a base layer with a cross section adapted to a heat exchange core, a cladding layer being respectively installed on the edges of the inner side walls of the base layer, and a pad being installed in the middle of the base layer; the cladding layer is stamped from a plate material having the same material as the heat exchange core, and comprises mutually perpendicular horizontal folded surfaces and sealing folded edges, a thermal stress folded edge convexed to one side is provided in the middle of the horizontal folded surface, and the convex direction of the thermal stress folded edge is opposite to the bending direction of the sealing folded edge; the horizontal folded surface is connected to the inner wall of the base layer, and the sealing folded edge is connected to the side of the base layer; the base layer is made of ordinary carbon steel material, and the pad is made of ordinary stainless steel material.

[0007] Preferably, the coating is made of nickel-based alloy or titanium alloy and has a thickness of 1.2 mm.

[0008] Preferably, the cladding layer and the backing plate are spot welded on the inner wall of the base layer, and the backing plate is made of S30408 ​​stainless steel with a thickness of 2 mm.

[0009] Preferably, the spacing between the side edges of the coating and the backing plate is 1 mm.

[0010] Preferably, two sides of the sealing fold are longer than the side edges of the base layer.

[0011] Preferably, the thermal stress fold is conical or arc-shaped.

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

[0013] The medium-pressure plate of the utility model includes a base layer, a covering layer and a pad. The covering layer is made of a metal sheet of the same material as the heat exchange core and then covered on the base layer after being pressed and assembled. The base layer is made of ordinary carbon steel material. The pad is made of ordinary stainless steel material because it does not directly contact the medium, which reduces the manufacturing cost of the utility model. It has excellent corrosion resistance, sealing performance, thermal stability and mechanical strength, and can meet the high requirements of nuclear power plants for heat exchangers.

[0014] In the utility model, four covering layers with the same structure are installed on the edges around the inner wall of the base layer. The covering layer is assembled in pieces to ensure the close fit between the covering layer and the base layer, ensure the flatness of the sealing surface after the pressure plate is assembled, and facilitate maintenance and replacement.

[0015] The coating layer of the utility model includes a horizontal folded surface connected to the upper surface of the base layer, and a thermal stress folded edge is arranged in the middle of the horizontal folded surface, which can reduce the influence of thermal stress on the coating structure during the use of the heat exchanger, and ensure that the utility model has sufficient strength and stability during the long-term operation of the nuclear power plant. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model;

[0017] Figure 2 is a schematic diagram of the structure of the cladding;

[0018] Figure 3 yes Figure 2 The front view of the middle cladding;

[0019] Figure 4 It is a schematic diagram of the structure of the base layer;

[0020] Figure 5 yes Figure 4 Side view of the mid-base layer;

[0021] In the figure: 1. base layer, 2. covering layer, 3. pad, 4. thermal stress fold, 5. horizontal fold, 6. sealing fold. DETAILED DESCRIPTION

[0022] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0023] like Figures 1 to 5A fully welded plate heat exchanger pressure plate for nuclear power shown in the figure comprises a base 1 whose cross section is adapted to a heat exchange core, a cladding 2 is respectively installed on the edges of the inner side wall of the base 1, and a pad 3 is installed in the middle of the base 1; the cladding 2 is stamped from a plate material of the same material as the heat exchange core, and comprises a horizontal folded surface 5 and a sealing folded edge 6 which are perpendicular to each other, a thermal stress folded edge 4 which protrudes to one side is provided in the middle of the horizontal folded surface 5, and the protruding direction of the thermal stress folded edge 4 is opposite to the bending direction of the sealing folded edge 6; the horizontal folded surface 5 is connected to the inner wall of the base 1, and the sealing folded edge 6 is connected to the side of the base 1; the base 1 is made of ordinary carbon steel material, and the pad 3 is made of ordinary stainless steel material.

[0024] The material of the coating 2 is nickel-based alloy or titanium alloy, and the thickness is 1.2 mm.

[0025] The cladding layer 2 and the backing plate 3 are spot welded on the inner wall of the base layer 1, and the backing plate 3 is made of S30408 ​​stainless steel with a thickness of 2 mm.

[0026] The side distance between the coating 2 and the backing plate 3 is 1 mm.

[0027] The two sides of the sealing fold 6 are longer than the side edges of the base layer 1 .

[0028] The thermal stress fold 4 is conical or arc-shaped.

[0029] The medium pressure plate of the utility model comprises a base layer 1, a cladding layer 2 and a pad 3. The cladding layer 2 is made of a metal sheet of the same material as the heat exchange core and then covered on the base layer 1 after being pressed and assembled. The base layer 1 is made of ordinary carbon steel material. The pad 3 is made of ordinary stainless steel material because it does not directly contact the medium, which reduces the manufacturing cost of the utility model. It has excellent corrosion resistance, sealing performance, thermal stability and mechanical strength, and can meet the high requirements of nuclear power plants for heat exchangers.

[0030] The above are only preferred examples of the present invention. It should be noted that for ordinary technicians in this field, under the technical enlightenment provided by the present invention, other equivalent deformations and improvements can also be made, which should also be regarded as the protection scope of the present invention.

Claims

1. A fully welded plate heat exchanger pressure plate for nuclear power, characterized in that: The invention comprises a base (1) whose cross section matches that of a heat exchange core, a cladding (2) being installed on the edges of the inner side wall of the base (1), and a pad (3) being installed in the middle of the base (1); the cladding (2) being stamped from a plate having the same material as that of the heat exchange core, and comprising mutually perpendicular horizontal folded surfaces (5) and sealing folded edges (6); a thermal stress folded edge (4) protruding toward one side being provided in the middle of the horizontal folded surface (5), and the protruding direction of the thermal stress folded edge (4) being opposite to the bending direction of the sealing folded edge (6); the horizontal folded surface (5) being connected to the inner wall of the base (1), and the sealing folded edge (6) being connected to the side of the base (1); the base (1) being made of ordinary carbon steel material, and the pad (3) being made of ordinary stainless steel material.

2. The fully welded plate heat exchanger pressure plate for nuclear power according to claim 1, characterized in that: The coating (2) is made of a nickel-based alloy or a titanium alloy and has a thickness of 1.2 mm.

3. The fully welded plate heat exchanger pressure plate for nuclear power according to claim 1 or 2, characterized in that: The cladding layer (2) and the backing plate (3) are spot welded on the inner wall of the base layer (1); the backing plate (3) is made of S30408 ​​stainless steel with a thickness of 2 mm.

4. The fully welded plate heat exchanger pressure plate for nuclear power according to claim 3, characterized in that: The side distance between the coating (2) and the backing plate (3) is 1 mm.

5. The fully welded plate heat exchanger pressure plate for nuclear power according to claim 4, characterized in that: The two sides of the sealing fold (6) are longer than the side edges of the base layer (1).

6. The method according to claim 5, characterized in that: The thermal stress folded edge (4) is conical or arc-shaped.

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