Heat exchanger head and method

Abstract

The application discloses a heat exchanger head and a method, the heat exchanger head comprises a head main body, a base, and the base is connected with the head main body through support seat A and support seat B.The preparation method of the heat exchanger head realizes the machining of large double-nozzle heads by using conventional equipment, the accuracy of repeated positioning is ensured by leaving a process positioning chuck at the head end B, and then, a sharp edge is formed at the inclined surface of the product head end B, and the sharp edge is not pressed by removing the process positioning chuck at the head end B finally.The preparation method of the heat exchanger head has high production efficiency, low processing cost and can be suitable for batch processing and production.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of mechanical manufacturing, and particularly relates to a heat exchanger head and method. BACKGROUND

[0002] The RPS large heat exchanger head for nuclear power plants generally has a hemispherical structure and two nozzle structures. A common manufacturing scheme is to integrally forge a nozzle coaxial with the hemispherical structure and the hemispherical structure, and to separately process the other nozzle as an independent part, and then to combine the two into a finished product by welding or flange connection. Since the structure is not integrated, the manufacturing method has the risk of insufficient strength at the connection.

[0003] Patent No. 2018220493293 discloses a tube plate and tube box structure for a heat exchanger of a nuclear power plant and a heat exchanger thereof, which comprises a tube plate, a head having a hole and being fixedly connected to one end of the tube plate, a shell fixedly connected to the other end of the tube plate, an internal heat insulation plate provided in the shell, a plurality of through holes provided on the heat insulation plate, a tube side connecting pipe fixed at the hole position of the head and communicating with the head, and a plurality of heat exchange tubes provided in the shell, one end of each of the heat exchange tubes penetrating through the through hole of the heat insulation plate and being fixedly connected to the tube plate. A through hole is formed in the shell, and a shell side connecting pipe is connected to the through hole and communicates with the cavity of the shell. The tube box exhaust nozzle, the tube box drain nozzle and the tube side connecting pipe are connected to the head by welding and are not integrally provided.

[0004] Therefore, there is a need for a heat exchanger head for a nuclear power plant, which can be integrally manufactured with the head. SUMMARY

[0005] To solve the above technical problems, the present application provides a heat exchanger head and method, which can solve the problem that the nozzle and the head are not integrally manufactured in the heat exchanger head for a nuclear power plant.

[0006] The present application is achieved by the following technical solutions.

[0007] The heat exchanger head provided by the present application comprises a head main body, a base, and the base is connected to the head main body through support seat A and support seat B.

[0008] Preferably, the head main body is in a semicircular shape, one end of the head main body is provided with a head end A, the other end of the head main body is provided with a head end B, and one side of the head main body is provided with a head end C.

[0009] Preferably, a pressing plate A is provided on the support seat A, and one end of the pressing plate A is connected to the head end A.

[0010] Preferably, a pressing plate B and a positioning surface are provided on the base, and one end of the pressing plate B is connected to the head end B.

[0011] Preferably, the base is provided with an adjusting screw, one end of which is connected with the head end C.

[0012] Preferably, one side of the head end B is provided with a sharp edge.

[0013] A preparation method of a heat exchanger head, comprising the following steps:

[0014] S1: using a forging equipment to forge a forging blank close to the contour of the head body, and then performing a quenching and tempering heat treatment to obtain a head blank A,

[0015] S2: the head blank A is opened at a larger diameter end as a head end B, the head end B is clamped on a lathe, the outer circle and the end surface as a head end A are lighted out as a rough reference, the rough reference surface lighted out at the head end A is clamped, the position of the axis of the head blank A is adjusted, the non-interference part of the inner spherical surface and the outer spherical surface is turned out, the end surface of the head end B is turned flat and processed into a process positioning chuck with a margin, the distance value from the end surface of the process positioning chuck to the center of the head end B is recorded, then the lathe clamps the process positioning chuck, the positive axis of the head body is found through the process positioning chuck, and the spherical center is positioned, the outer circle at the head end A, the non-interference part of the adjacent outer spherical surface and the transition fillet are turned, the holes at the head end A are drilled and bored, the transition fillet of the inner spherical surface is turned using the lathe, the end surface of the head end A is turned, and a head blank B is obtained,

[0016] S3: the head blank B is fixed using a milling machine, the spherical center and the vertical axis are positioned through the process positioning chuck, the head blank B is rotated along the axis to ensure that the margin at the head end C is uniform, the outer spherical surface and the outer shape at the head end C and the transition fillet are milled using a milling head, and the milled surface is flat with the turned spherical surface, and a head body is prepared,

[0017] S4: the base is installed on the upper part of the milling machine, the direction of the base is adjusted so that the positioning surface is perpendicular to the axis direction of the side milling head of the gantry milling machine, the base is fixed, the head body is hung on the base, the head body is clamped through the setting of the pressing plate A and the pressing plate B, and the holes and the transition fillet of the head end C are processed using the side milling head,

[0018] S5: finally, the process positioning chuck is removed by turning on the lathe, and the sharp edge is turned out, the sharp edge is protected, and the preparation is completed.

[0019] Preferably, in the step S4, the axis of the head end C is adjusted and aligned using an adjusting screw, and then the head body is clamped through the setting of the pressing plate A and the pressing plate B, and then the adjusting screw is removed.

[0020] Preferably, in the step S4, the head end C is made lower than the horizontal position, and then the axis of the head end C is adjusted and aligned using the adjusting screw combined with the dial gauge, and then the head body is clamped through the setting of the pressing plate A and the pressing plate B.

[0021] Preferably, the step S5, the thick paperboard is protected at the sharp edge.

[0022] The present application has the advantages of:

[0023] The preparation method of the heat exchanger head realizes the processing of large double-nozzle heads by using conventional equipment, ensures the accuracy of repeated positioning by leaving a process positioning chuck at the head end B, and ensures that the sharp edge is not crushed by removing the process positioning chuck at the head end B. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a structural schematic diagram of the present application;

[0025] Figure 2 is a structural schematic diagram of the present application;

[0026] Figure 3 is a structural schematic diagram of the head body of the present application;

[0027] Figure 4 is a structural schematic diagram of the head body of the present application;

[0028] Figure 5 is a schematic diagram of the head end A non-interference part of the present application;

[0029] In the figure: 1-head end A, 2-head end C, 3-outer spherical surface, 4-process positioning chuck, 5-inner spherical surface, 6-head end B, 7-spherical center, 8-adjusting screw, 9-positioning surface, 10-base, 11-pressing plate A, 12-pressing plate B, 13-sharp edge, 14-head body, 15-supporting seat A, 16-supporting seat B, 17-turning tool. DETAILED DESCRIPTION

[0030] The technical solutions of the present application are further described below, but the scope of protection is not limited to the description.

[0031] Example 1:

[0032] As shown in Figures 1 to 5 A heat exchanger head, comprising a head body 14, a base 10, the base 10 is connected with the head body 14 through supporting seat A 15 and supporting seat B 16.

[0033] The head body 14 is arranged in a semicircle, one end of the head body 14 is provided with a head end A1, the other end of the head body 14 is provided with a head end B6, and one side of the head body 14 is provided with a head end C2. Wherein, the head end A1, the head end B6 and the head end C2 are all pipe nozzles.

[0034] The support seat A15 is provided with a pressing plate A11, one end of the pressing plate A11 is connected with the head end A1.

[0035] The base 10 is provided with a pressing plate B12 and a positioning surface 9, one end of the pressing plate B12 is connected with the head end B6.

[0036] The base 10 is provided with an adjusting screw 8, one end of the adjusting screw 8 is connected with the head end C2, and the adjusting screw 8 can adjust the horizontal height of the head end C2.

[0037] One side of the head end B6 is provided with a sharp edge 13, which is arranged to meet the requirement of subsequent flaw detection of the head, and the welding groove needs to be processed after flaw detection. The processing of the groove is not within the scope of the application.

[0038] A preparation method of a heat exchanger head, comprising the following steps:

[0039] S1: using forging equipment to forge a forging blank close to the contour of the head body 14, and then performing a quenching and tempering heat treatment to obtain a head blank A, the quenching and tempering treatment step is: normalizing (heating to 915±10℃ in the furnace, holding for 2.5-3 hours, air cooling to room temperature) + tempering (heating to 650±10℃ in the furnace, holding for 4-4.5 hours, air cooling to room temperature),

[0040] S2: the larger opening diameter end of the head blank A is taken as the head end B6, the head end B6 is clamped on the lathe, the outer circle and the end face are taken as the rough reference, the rough reference surface is clamped by the four-jaw chuck, the position of the head blank A axis is adjusted (the purpose of adjusting the axis is to make the inner and outer wall machining allowance of the head end B6 uniform, to avoid local machining), so that the opening allowance of the head end B6 is uniform, the non-interference part of the inner spherical surface 5 and the outer spherical surface 3 is turned out, the end face of the head end B6 is turned flat and a machining allowance is left to form a process positioning chuck 4, which is convenient for clamping and fixing during machining, and the distance value from the end face of the process positioning chuck 4 to the center of the head end B6 (the center of the head end B6 and the spherical center 7 of the head body 14 do not necessarily coincide, and the distance from the end face of the process positioning chuck 4 to the spherical center 7 is recorded for subsequent machining positioning) is recorded, which is used for subsequent machining positioning of the spherical center 7, then the lathe clamps the process positioning chuck 4, the positive axis of the head body 14 is found through the process positioning chuck 4, and the spherical center 7 is positioned, the outer circle at the head end A1, the non-interference part of the adjacent outer spherical surface 3 (when the outer contour surface within the range of 240mm from the head end A1 end face is machined, the turning tool 17 does not interfere, and point a is the non-interference point, see Figure 5 ) and the transition fillet are machined, the holes at the head end A1 are drilled and bored, the transition fillet of the inner spherical surface 5 is turned by the lathe, the end face of the head end A1 is turned, and the head blank B is obtained,

[0041] S3: the head blank B is fixed by using a gantry milling machine, the spherical center 7 and the vertical axis are positioned by using the process positioning chuck 4, the head blank B is rotated along the axis to ensure that the allowance at the head end C2 is uniform (the purpose of rotating the head blank B is to position the lateral head end C2 and to divide the machining allowance evenly), the outer spherical surface 3 and the outer shape at the head end C2 and the transition fillet are milled by using a milling head, and the machined spherical surface is flat (because the spherical surface is more efficient, part of the outer spherical surface 3 is machined by using the lathe first, and the remaining part of the outer spherical surface 3 that cannot be machined by using the lathe is machined by using the milling machine, the outer spherical surface part milled during milling should be flat with the outer spherical surface part turned, to prevent a large difference in the outer wall of the head body 14), and the head body 14 is obtained,

[0042] S4: the base 10 is installed on the workbench of the gantry milling machine, the direction of the base 10 is adjusted so that the positioning face 9 is perpendicular to the axis direction of the side milling head of the gantry milling machine, the base 10 is fixed, the head body 14 is hoisted onto the base 10, the head body 14 is clamped by using the setting plate A11 and the setting plate B12, the holes and the transition fillet of the head end C2 are machined by using the side milling head,

[0043] S5: finally, the process positioning chuck 4 is removed by turning on the vertical lathe, and the sharp edge 13 is turned out, the sharp edge 13 is protected, and the preparation is completed.

[0044] In step S4, the axis of the aligned head end C2 is adjusted using the adjusting screw 8, and then the head body 14 is clamped by setting the pressing plate A11 and the pressing plate B12, and then the adjusting screw 8 is removed.

[0045] In step S4, the head end C2 is made to be lower than the correct installation level position, so as to facilitate the upward lifting and adjustment of the adjusting screw 8, and then the axis of the aligned head end C2 is adjusted using the adjusting screw 8 combined with the dial gauge, and then the head body 14 is clamped by setting the pressing plate A11 and the pressing plate B12.

[0046] In step S5, the thick paperboard is pasted at the sharp edge 13 to prevent damage at the sharp edge 13.

[0047] In the preparation method of the heat exchanger head, the spherical center 7 is the design reference of the head body 14, and the spherical center of the outer spherical surface 3 and the inner spherical surface 5 and the positioning of the process positioning chuck 4 are all ensured by using the spherical center 7 of the head body 14, so as to ensure the product precision; and the subsequent positioning of the axis of the lateral head end C2 is also relatively convenient by positioning through the spherical center 7.

Claims

1. A heat exchanger head, characterized by: It includes the head main body (14), base (10), the base (10) is connected with head main body (14) through support seat A (15), support seat B (16); The head main body (14) is arranged in a semicircle, one end of the head main body (14) is provided with a head end A (1), the other end of the head main body (14) is provided with a head end B (6), one side of the head main body (14) is provided with a head end C (2); The support seat A (15) is provided with a pressing plate A (11), one end of the pressing plate A (11) is connected with the head end A (1); The base (10) is provided with a pressing plate B (12) and a positioning surface (9), one end of the pressing plate B (12) is connected with the head end B (6); The base (10) is provided with an adjusting screw (8), one end of the adjusting screw (8) is connected with the head end C (2); One side of the head end B (6) is provided with a sharp edge (13); A preparation method of a heat exchanger head, comprising the following steps: S1: using forging equipment to forge a forging blank close to the profile of the head main body (14), then performing quenching and tempering heat treatment to obtain a head blank A; S2: the head blank A is clamped on a lathe, the outer circle and end face of the head end A (1) are lighted out as a rough reference, the rough reference surface lighted out at the head end A (1) is clamped, the position of the axis of the head blank A is adjusted, the non-interference part of the inner spherical surface (5) and the outer spherical surface (3) is turned, the end face of the head end B (6) is turned flat and a process positioning chuck (4) is processed with a margin, the distance value from the end face of the process positioning chuck (4) to the center of the head end B (6) is recorded, then the lathe clamps the process positioning chuck (4), the positive axis of the head main body (14) is found through the process positioning chuck (4), and the spherical center (7) is positioned, the outer circle at the head end A (1), the non-interference part of the adjacent outer spherical surface (3) and the transition fillet are turned, the hole at the head end A (1) is drilled and bored, the transition fillet of the inner spherical surface (5) is turned using the lathe, the end face of the head end A (1) is turned, and the head blank B is obtained; S3: the head blank B is fixed using a milling machine, the spherical center (7) and the vertical axis are positioned through the process positioning chuck (4), the head blank B is rotated along the axis to ensure that the margin at the head end C (2) is uniform, the outer spherical surface (3) and the outer shape at the head end C (2) are milled using a milling head, the transition fillet is milled, and the spherical surface is milled flat, and the head main body (14) is prepared; S4: the base (10) is installed on the upper of the milling machine, the direction of the base (10) is adjusted so that the positioning surface (9) is perpendicular to the axis direction of the side milling head of the gantry milling machine, the base (10) is fixed, the head main body (14) is hung on the base (10), the head main body (14) is clamped through the pressing plate A (11) and the pressing plate B (12), and the hole and the transition fillet of the head end C (2) are processed using the side milling head. S5: Finally, the process positioning chuck (4) is removed by turning on the lathe, and the sharp edge (13) is turned out, and protection is performed on the sharp edge (13), i.e. the preparation is completed.

2. A heat exchanger head as claimed in claim 1, wherein In the step S4, the axis of the head end C (2) is adjusted using the adjusting screw (8), and then the head body (14) is clamped by setting the pressing plate A (11) and the pressing plate B (12), and then the adjusting screw (8) is removed.

3. A heat exchanger head as claimed in claim 2, wherein In the step S4, the head end C (2) is made to be lower than the horizontal position, and then the axis of the head end C (2) is adjusted using the adjusting screw (8) in combination with the dial gauge, and then the head body (14) is clamped by setting the pressing plate A (11) and the pressing plate B (12).

4. A heat exchanger head as claimed in claim 1, wherein In the step S5, thick paperboard is pasted for protection at the position where the sharp edge (13) is formed.

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