All-welded plate heat exchanger

Abstract

An all-welded plate heat exchanger belongs to the technical field of heat exchanger design and manufacture, and the main body structure of the all-welded plate heat exchanger is composed of a plate bundle, a pressing plate, a first medium inlet header, a first medium outlet header, a second medium inlet header, a second medium outlet header and other parts. The plate bundle is composed of a folded corrugated plate, an inlaid strip, a 1 / 2 inlaid strip, a first angle inlaid strip, a second angle inlaid strip, a first comb plate, a second comb plate and other parts. The first corner panel and the second corner panel are arranged on four side edges of the plate bundle, and the panels are installed on one side face of the plate bundle, located between the plate pass half tube and the shell pass half tube and clamped between the two corrugated plates. The first comb plate and the second comb plate are installed on the other side face of the plate stack. Automatic welding can be achieved, so that welding seams are firm and reliable, and machining and manufacturing are convenient.

Description

Technical Field

[0001] The invention belongs to the technical field of heat exchanger design and manufacturing, and relates to a manufacturing method of a fully welded plate heat exchanger. Background Art

[0002] Plate heat exchangers have been widely used as efficient heat exchange equipment in recent years. However, their low pressure bearing capacity has increasingly become a bottleneck for their further development. The reason is that the welding of thin plates and thick plates is the main factor restricting their application. Especially at the inlet and outlet of the medium, due to space limitations, the thin plates and inserts (inserts) here can only be sealed and welded at the edge, so the strength is low. It can be seen that the design and manufacture of the inlet and outlet of the medium has become a restrictive factor in the development of plate heat exchangers. Summary of the invention

[0003] The purpose of the present invention is to solve the problems existing in the prior art, eliminate potential safety hazards, and provide a plate bundle with excellent reliability, pressure resistance, and high temperature difference resistance, and a fully welded plate heat exchanger composed of the plate bundle.

[0004] To this end, the technical solution adopted in the present invention is: A fully welded plate heat exchanger consists of a plate bundle, a compression plate, a medium A inlet header, a medium A outlet header, a medium B inlet header, and a medium B outlet header.

[0005] The corrugated plate sheet of the present invention is formed by stamping and has two kinds of corrugations, convex corrugations and concave corrugations, and a flat periphery. On one side of the corrugated plate sheet, an upper bending edge and a lower bending edge are arranged on the flat periphery at intervals.

[0006] The corrugated board sheets of the present invention are assembled in a folded and interlocked manner.

[0007] In the first fold, two corrugated sheets are buckled together, and the convex corrugations on the opposite sides contact each other to form a support structure. The upper bending edges of each are buckled together to form a half-tube of the board, and the lower bending edges of the two corrugated sheets are buckled together to form a board outlet.

[0008] Folding for the second time, the third corrugated plate is stacked on the second corrugated plate, and the lower bending edges of each corrugated plate are buckled to form a shell side half pipe, and the upper bending edges of the two corrugated plate sheets are buckled to form a shell side outlet.

[0009] The basic shape of the inlay is a cuboid, the head is a semi-cylindrical surface of the inlay extending from the cuboid, the radius of the semi-cylindrical surface of the inlay is equal to r, and the tail extends out a rectangular block with a rounded transition, the rounded corner is the inner fillet surface of the tail of the inlay, and its radius is equal to R.

[0010] After the plate stack is bent and screwed, insert a strip between the plate pairs, insert its head, i.e., the semi-cylindrical surface of the strip, into the plate side half-tube, and make its tail close to the two adjacent shell side half-tubes. Insert another strip between the plate pairs, insert its head, i.e., the semi-cylindrical surface of the strip, into the shell side half-tube, and make its tail close to the two adjacent plate side half-tubes, and insert the strips between all the plate pairs in turn.

[0011] The insertion of the 1 / 2 strip is the same as the strip.

[0012] The nail angle strip is sawtooth-shaped, and is composed of a nail tooth top and a nail tooth root connected to a rectangular plate, the radius of the nail tooth top cylindrical surface is equal to r, and the radius of the nail tooth root cylindrical surface is equal to R. The nail tooth top and the nail tooth root are cylindrical surfaces tangent to each other.

[0013] The structure of the corner strip B is basically the same as that of the corner strip A, both of which are composed of tooth tops and tooth roots with the same geometric parameters. The only difference is that the two ends of the corner strip A are 1 / 2 tooth roots, while the two ends of the corner strip B are 1 / 2 tooth tops.

[0014] The A corner insert is inserted into the left edge of the plate stack, the A tooth top is inserted into the inner circular surface of the left arc of the folded plate, and the A tooth root is closely attached to the outer cylindrical surface of the plate half-tube. The B corner insert is inserted into the side edge of the plate stack. The B tooth top is inserted into the inner circular surface of the plate half-tube, and the B tooth root is closely attached to the outer circular surface of the left arc of the folded plate.

[0015] The comb plate A and the comb plate B are in the shape of combs and can be assembled in a canine-tooth staggered and mutually interlocking manner. The comb tip can extend into the inner arc of the plate stack, and the tail can wrap the outer arc of the plate stack. The comb plate A and the comb plate B are installed on the other side of the plate stack.

[0016] Comb plate A, comb plate B and plate stack are connected by welding. Since the weld is straight, continuous and the corners are smooth, it is very suitable for automatic welding. Beneficial Effects

[0017] The cross section of the plate side half pipe (shell side half pipe) is an arc. As a pressure-bearing sealing section on the plate side (shell side), it has the advantages of low stress and good pressure bearing capacity. At the same time, the arc-shaped inner wall is easy to scour and impurities are difficult to adhere to. This structure has the effect of reducing and eliminating the existence of corrosion sources, so the arc-shaped structure has strong corrosion resistance. The plate side half pipe (shell side half pipe) weld formed by buckling two corrugated plates is located on the arc. Since the stress on the arc is small, the weld here is stronger and more reliable than other structures.

[0018] The shell-side outlet (plate-side outlet) is composed of the outer circles of two plate-side half-tubes (shell-side half-tubes), and its cross-section is an arc transition, that is, the outlet gradually becomes larger, and there is no problem of the outlet becoming smaller. Therefore, the outlet pressure drop of this shape will not increase, thereby increasing its advantage as a heat exchanger.

[0019] The position of the inlay strip is between the upper bending edge and the lower bending edge of the corrugated plate, and it is the transition section of its structure. As the sealing section on the plate pair, the inlay strip is between the sealing section and the open section of the plate pair, so it has the requirements of sealing performance and also bears the function of fluid separation.

[0020] The end face of the plate-side half-tube (or shell-side half-tube) is embedded between the A-side of the tail of the insert and the A-side of the head of the insert. This plane weld is arranged periodically, has a regular geometric shape, and has strong repeatability. The welding base surface is large and can be automated, thereby enhancing the reliability and strength of the weld, which is beneficial to the division of the plate and shell and the pressure-bearing needs.

[0021] The connection structure of the comb plate A and comb plate B on one side of the plate stack has an S-shaped weld bead along the side of the folded plate. The weld bead is arranged periodically, has a regular geometric shape, and has strong repeatability. One weld can connect the comb plate A, comb plate B and corrugated plate into one, so the welding efficiency is high and the welding automation can be realized. Embodiment 1

[0022] A fully welded plate heat exchanger is composed of a plate bundle 111, a compression plate 7, a medium A inlet header 201, a medium A outlet header 202, a medium B inlet header 203, and a medium B outlet header 204.

[0023] like Figure 1~2 As shown, the corrugated plate sheet 1 of the present invention is formed by stamping, and has two types of corrugations, convex and concave, and the periphery is a straight edge, that is, a flat periphery 13. On one side of the corrugated plate sheet 1, an upper bending edge 11 and a lower bending edge 12 are arranged on the flat periphery 13 at intervals, and the upper bending edge 11 and the lower bending edge 12 are both arc-shaped (such as Figure 2 as shown).

[0024] The plate stack 112 of the present invention is as follows Fig.14 It is made of a whole roll of steel that is stamped and folded, without having to be cut into individual corrugated sheets.

[0025] like Figure 3~4 As shown, the plate-to-plate space where the medium flows in from the left (i.e., flows in from the plate-side inlet 101) and flows out from the right (i.e., flows out from the plate-side outlet 102) is defined as the plate-side, and the plate-to-plate space where the medium flows in from the right (i.e., flows in from the shell-side inlet 103) and flows out from the left (i.e., flows out from the shell-side outlet 104) is defined as the shell-side.

[0026] The corrugated board sheets 1 of the present invention are assembled by folding and buckling.

[0027] In the first folding, the second corrugated board sheet 1 is buckled with the first corrugated board sheet 1, and the convex corrugations on the opposite sides contact each other to form a supporting structure. The upper bending edges 11 of each are buckled to form a half tube 14 (such as Figure 3As shown), the lower bent edges 12 of the two corrugated board sheets 1 are buckled to form a board outlet 102.

[0028] like Figure 3~4 As shown, in the second folding, the third corrugated plate sheet 1 is stacked on the second corrugated plate sheet 1, and the respective lower bending edges 12 are buckled to form a shell side half pipe 15, and the upper bending edges 11 of the two corrugated plate sheets 1 are buckled to form a shell side outlet 104.

[0029] like Figure 3 As shown, the plate stack 112 of the present invention, the left and right arcs formed by folding the corrugated plate sheet 1, the plate side half tube 14 and the shell side half tube 15 have equal inner and outer diameters. For convenience, the inner radius is r and the outer radius is R.

[0030] like Figure 6 As shown, the basic shape of the insert 5 (58) is a rectangular parallelepiped, the head is a semi-cylindrical surface 55 of the insert extending from the rectangular parallelepiped, the radius of the semi-cylindrical surface 55 of the insert is equal to r, and the tail extends out of a rectangular block with rounded corners, the rounded corner is the inner rounded corner surface 53 of the tail of the insert, and its radius is equal to R.

[0031] like Figure 5 As shown, the 1 / 2 fillet strip 57 is half of the fillet strip 5 (58). The 1 / 2 fillet strip 57 is arranged at the top and bottom of the plate stack 112.

[0032] like Figure 7 As shown, after the plate stack 112 is bent and spirally stacked, a strip 5 is inserted between the plate pairs, and its head, i.e., the strip semi-cylindrical surface 55, is inserted into the plate side half-tube 14, so that its tail is closely attached to the two adjacent shell side half-tubes 15. Another strip 51 is inserted between the plate pairs, and its head, i.e., the strip semi-cylindrical surface 55, is inserted into the shell side half-tube 15, so that its tail is closely attached to the two adjacent plate side half-tubes 14, and the strip 5 is inserted between all the plate pairs in sequence.

[0033] The insertion of 1 / 2 inlay strip 57 is the same as that of inlay strip 5.

[0034] Welding is performed along the side of the flat periphery 13. Since the weld formed by the side of the flat periphery 13 and the outer side surface 56 of the inlay strip is basically straight and regular, the welding in this area is very suitable for automatic welding.

[0035] like Fig.13 As shown, the end face of the plate side half pipe 14 (or the shell side half pipe 15) is embedded between the A face 52 of the tail portion of the insert and the A face 54 of the head portion of the insert. This plane weld has a periodic arrangement, a regular geometric shape, and strong repeatability. The welding base surface is large and can be automated, thereby enhancing the reliability and strength of the weld, which is beneficial to the separation of the plate and shell and the need for pressure bearing.

[0036] like Figure 8As shown, the nail corner strip 2 is sawtooth-shaped, and is composed of a nail tooth top 21 and a nail tooth root 22 connected to a rectangular plate. The radius of the cylindrical surface of the nail tooth top 21 is equal to r, and the radius of the cylindrical surface of the nail tooth root 22 is equal to R. The nail tooth top 21 and the nail tooth root 22 are cylindrical surfaces tangent to each other.

[0037] like Fig. 9 As shown, the second angle insert 3 is sawtooth-shaped, and is composed of a second tooth top 31 and a second tooth root 32 connected to a rectangular plate. The radius of the cylindrical surface of the second tooth top 31 is equal to r, and the radius of the cylindrical surface of the second tooth root 32 is equal to R. The second tooth top 31 and the second tooth root 32 are cylindrical surfaces tangent to each other.

[0038] The structure of corner strip A 2 is basically the same as that of corner strip B 3 , both of which are composed of tooth tops and tooth roots with the same geometric parameters. The only difference is that the two ends of corner strip A 2 are 1 / 2 tooth roots, while the two ends of corner strip B 3 are 1 / 2 tooth tops.

[0039] like Fig.12 As shown, the A corner strip 2 is inserted into the left edge of the plate stack 112 from the lower left in a direction perpendicular to the plate side inlet 101. The A tooth top 21 is inserted into the inner circular surface of the left arc of the folded plate, and the A tooth root 22 is closely attached to the outer cylindrical surface of the plate side half pipe 14. The B corner strip 3 is inserted into the side edge of the plate stack 112 from the lower left in a direction perpendicular to the shell side outlet 104. The B tooth top 31 is inserted into the inner circular surface of the plate side half pipe 14, and the B tooth root 32 is closely attached to the outer circular surface of the left arc of the folded plate.

[0040] The method of inserting corner strip A 2 and corner strip B 3 into the right edge is the same as above.

[0041] like Fig.10 As shown, the comb plate A 41 and the comb plate B 42 are in the shape of a comb and can be assembled in a canine-tooth staggered and mutually interlocking manner. The comb tip can extend into the inner arc of the plate stack 112, and the tail can wrap around the outer arc of the plate stack 112, such as Fig.15 As shown, comb plate A 41 and comb plate B 42 are installed on the other side of the plate stack 112 .

[0042] The first comb plate 41, the second comb plate 42 and the plate stack 112 are connected by welding. Here, because the weld bead is straight, continuous and the corner is smooth, it is very suitable for automatic welding.

[0043] The installed plate bundle 111 is as follows Fig.12 , Fig.15 shown.

[0044] like Fig.11 The pressing plate 7 is a rectangular plate, on which a process hole 71 is provided, and the process hole 71 is used for hoisting.

[0045] The tail B surface 51 of the inlay strip and the facade 23 of the A inlay block are connected to the B medium outlet header 204, and the facade 33 of the B inlay block and the tail of the A comb plate 41 (B comb plate 42) are connected to the A medium inlet header 201 (B medium inlet header 203).

[0046] The present invention is a heat exchange principle of a fully welded plate heat exchanger: the present invention can realize heat exchange between two fluids, fluid A (medium A) enters the heat exchanger from medium A inlet header 201, is distributed to each plate pair through plate side inlet 101, then is collected at plate side outlet 102, and flows out of the heat exchanger through medium A outlet header 202. Fluid B (medium B) enters the heat exchanger from shell side inlet 103, is distributed to each plate pair through medium B inlet header 203, then is collected at shell side outlet 104, and flows out of the heat exchanger through medium B outlet header 204. The two fluids A and B located on both sides of the corrugated plate sheet 1 use the corrugated plate sheet 1 as a heat transfer conductor, and heat exchange occurs at their interface, thereby completing the heat exchange function of the heat exchanger.

[0047] The B insert outer facade 33 is the connection surface between the A medium inlet header 201 and the B medium inlet header 203 .

[0048] The outer facade 23 of the A-block and the B-side 51 of the tail of the inlay strip are the connection surfaces of the A-medium outlet header 202 and the B-medium outlet header 204 . Embodiment 2

[0049] like Fig.17 As shown, the plate bundle 111 of the present invention is composed of a plate stack 112, a comb plate A 41, a comb plate B 42, a comb plate C 43, and a comb plate D 44. The structure of the comb plate C 43 is the same as that of the comb plate A 41, and the comb length of the comb plate C 43 is shorter than the comb length of the comb plate A 41. The structure of the comb plate D 44 is the same as that of the comb plate B 42, and the comb length of the comb plate D 44 is shorter than the comb length of the comb plate B 42.

[0050] The corrugated plate sheet 1 of this embodiment is formed by stamping and has two types of corrugations, convex and concave, and the periphery is a straight edge, namely a flat periphery 13, which is bent and folded to form a plate stack 112.

[0051] The comb plate A 41 and the comb plate B 42 are installed on one side of the plate stack 112, and the comb plate C 43 and the comb plate D 44 are installed on the other side of the plate stack 112. Thus, a plate bundle with the plate side outlet and the shell side outlet located on the same side of the plate stack 112 is formed.

[0052] In this embodiment, the plate-side outlet and the shell-side outlet are formed by adjusting the length of the comb of the comb plate. Embodiment 3

[0053] The plate bundle 111 of the present invention is composed of a plate stack 112, a comb plate A 41, a comb plate B 42, a comb plate C 43, and a comb plate D 44. The structure of the comb plate C 43 is the same as that of the comb plate A 41, and the comb length of the comb plate C 43 is shorter than the comb length of the comb plate A 41. The structure of the comb plate D 44 is the same as that of the comb plate B 42, and the comb length of the comb plate D 44 is shorter than the comb length of the comb plate B 42.

[0054] The corrugated plate sheet 1 of this embodiment is formed by stamping and has two types of corrugations, convex and concave, and the periphery is a straight edge, namely a flat periphery 13, which is bent and folded to form a plate stack 112.

[0055] The comb plate A 41 and the comb plate D 44 are installed on one side of the plate stack 112. The comb plate B 42 and the comb plate C 43 are installed on the other side of the plate stack 112. Thus, a plate bundle having a plate side outlet and a shell side outlet located on different sides of the plate stack 112 is formed. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 Schematic diagram of corrugated plate structure Figure 2 Schematic diagram of the local structure of the corrugated plate (different viewing angles) Figure 3 Schematic diagram of board pair structure Figure 4 Schematic diagram of plate pair structure (another perspective) Figure 5 1 / 2 Schematic diagram of the strip structure Figure 6 Schematic diagram of the trim structure (top, middle and bottom are the same trim from different viewing angles) Figure 7 Schematic diagram of the connection between plate pair and flange Figure 8 Axonometric and three-view drawings of corner insert Fig. 9 Axonometric and three-view drawings of corner insert Fig.10 Comb board second view Fig.11 Schematic diagram of the clamping plate structure Fig.12 Schematic diagram of fully welded plate bundle structure Fig.13 Schematic diagram of the local structure of the connection between the plate pair and the inlay strip Fig.14 Schematic diagram of plate stacking structure of the present invention Fig.15 Schematic diagram of the connection structure between plate stack and comb plate Fig.16 Assembly drawing of the fully welded plate heat exchanger of the present invention Fig.17 Schematic diagram of the fully welded plate bundle structure (Example 2).

Claims

1. A fully welded plate heat exchanger, the main structure of which is composed of a plate bundle (111), a compression plate (7), a medium A inlet header (201), a medium A outlet header (202), a medium B inlet header (203), and a medium B outlet header (204), characterized in that: The component plate stack (112) constituting the plate bundle (111) is formed by bending and folding the corrugated plate sheet (1).

2. A plate and shell heat exchanger according to claim 1, characterized in that: The plate bundle (111) is composed of a plate stack (112), inlay strips (5, 58), a 1 / 2 inlay strip (57), a first corner inlay strip (2), a second corner inlay strip (3), a first comb plate (41), and a second comb plate (42).

3. A plate and shell heat exchanger according to claim 1, characterized in that: The corrugated plate sheet (1) is punched into convex and concave corrugations, a flat periphery (13), an upper bending edge (11) and a lower bending edge (12), and then bent and folded into a plate stack (112), wherein the upper bending edge (11) and the lower bending edge (12) are both arc-shaped.

4. A plate and shell heat exchanger according to claim 3, characterized in that: The plate stack (112) is assembled by folding and buckling corrugated plate sheets (1): in the first folding, the second corrugated plate sheet (1) is buckled with the first corrugated plate sheet (1), and their respective upper bending edges (11) are buckled to form a plate-side half-tube (14), and the lower bending edges (12) of the two corrugated plate sheets (1) are buckled to form a plate-side outlet (102); in the second folding, the third corrugated plate sheet (1) is stacked and screwed on the second corrugated plate sheet (1), and their respective lower bending edges (12) are buckled to form a shell-side half-tube (15), and the upper bending edges (11) of the two corrugated plate sheets (1) are buckled to form a shell-side outlet (104).

5. The plate and shell heat exchanger according to claim 2, characterized in that: The basic shape of the insert strip (5, 58) is a rectangular parallelepiped, the head is a semi-cylindrical insert strip (55) extending from the rectangular parallelepiped, the radius of the semi-cylindrical insert strip (55) is equal to r, the tail is a rectangular block with rounded corner transition, the rounded corner is the inner rounded corner surface (53) of the tail of the insert strip, and its radius is equal to R; the 1 / 2 insert strip (57) is half of the insert strip (5, 58). The 1 / 2 insert strip (57) is arranged at the top and bottom of the plate stack (112).

6. A plate and shell heat exchanger according to claim 2, characterized in that: The end face of the plate-side half tube (14) (or the shell-side half tube (15)) is embedded between the A face (52) of the tail portion of the insert and the A face (54) of the head portion of the insert.

7. A plate and shell heat exchanger according to claim 2, characterized in that: The A corner insert (2) is sawtooth-shaped and is composed of a tooth top (21) and a tooth root (22) connected to a rectangular plate. The radius of the cylindrical surface of the tooth top (21) is equal to r, and the radius of the cylindrical surface of the tooth root (22) is equal to R. The tooth top (21) and the tooth root (22) are cylindrical surfaces tangent to each other. The structure of the B corner insert (3) is similar to that of the tooth root (22), and both are composed of tooth tops and tooth roots with the same geometric parameters. The difference is that the two ends of the A corner insert (2) are 1 / 2 tooth roots, while the two ends of the B corner insert (3) are 1 / 2 tooth tops.

8. The plate and shell heat exchanger according to claim 2, characterized in that: The first comb plate (41) and the second comb plate (42) are in the shape of a comb and can be assembled in a manner of interlacing and interlocking. The tip of the comb can extend into the inner arc of the plate stack (112), and the tail can wrap around the outer arc of the plate stack (112). The first comb plate (41) and the second comb plate (42) are installed on the other side of the plate stack (112).

9. A plate and shell heat exchanger according to claim 1, wherein the plate bundle (111) is composed of a plate stack (112), a comb plate A (41), a comb plate B (42), a comb plate C (43), and a comb plate D (44). Characterized in that: The corrugated plate (1) is formed by stamping and has two types of corrugations, convex and concave, and the periphery is a straight edge, i.e., a flat periphery (13). The corrugated plate (1) is bent and folded to form a plate stack 112.

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