A device for reducing thermal deformation of a plate heat exchanger during laser welding

Abstract

The application provides a plate heat exchanger laser welding heat deformation reduction device, and relates to the field of plate heat exchanger welding, which comprises a support frame, a water storage tank, a water pump, a cooling water tray, an upper die, a lower die assembly and an overflow pipe. The water storage tank and the water pump are respectively arranged on the inner side of the support frame, the cooling water tray is fixed on the top side of the support frame, the water pump is connected with the water storage tank through a water suction pipe, and a water outlet pipe is upwardly connected to the upper end of the inner side of the upper water tank. The upper die is provided with two groups and is arranged in the cooling water tray, and the two ends of the upper die are respectively bolted with the bottom end of the telescopic bottom of the electric cylinder and the bottom end of the guide rod slidingly arranged in the fixing sleeve. The lower die assembly comprises a lower die plate and a cooling water pipe. The bottom plate is bolted with the lower die plate, and the cooling water pipe is arranged on the lower die plate. The product is previously soaked, and the heat generated during laser welding of the product can be removed under the blowing of the cooling fan and the water circulation in the cooling water pipe, so that the deformation of the product is reduced.

Description

Technical Field

[0001] This invention relates to the field of plate heat exchanger welding technology, and in particular to a device for reducing thermal deformation during laser welding of plate heat exchangers. Background Technology

[0002] Plate heat exchangers utilize various welding techniques to achieve sealing and connection between plates, adapting to diverse operating conditions. The welding process directly impacts the equipment's sealing performance, pressure resistance, and corrosion resistance. Especially under extreme conditions such as high temperature, high pressure, or corrosive media, welding quality is a core guarantee for the long-term reliable operation of the equipment.

[0003] However, existing plate heat exchanger products only use a clamping device during laser welding, which can cause thermal deformation of the product during the welding process, increasing the defect rate in the product manufacturing process. Summary of the Invention

[0004] To address the problems in the background art, the present invention provides a device for reducing thermal deformation during laser welding of plate heat exchangers. By utilizing the prior immersion of the product in water and the action of air blowing from the cooling fan and water circulation in the cooling water pipes, the welding heat can be carried away during laser welding, thereby reducing the deformation of the product.

[0005] The present invention provides a device for reducing thermal deformation during laser welding of a plate heat exchanger, specifically comprising: a support frame, a water storage tank, a water pump, a cooling water pan, an upper mold, a lower mold assembly, and an overflow pipe; The top two ends of the support frame are respectively fixed with support frames by bolts. Two sets of electric cylinders and four sets of fixing sleeves are respectively fixed on the support frames by bolts. One set of support frames is also equipped with an upper water tank. The water storage tank and water pump are respectively installed inside the support frame. The cooling water pan is fixed in the middle of the top side of the support frame. The water pump's pumping pipe is connected to the water storage tank, and the water outlet pipe is connected upward to the upper end of the inner side of the upper water tank. The upper mold is provided in two sets and is placed in the cooling water pan respectively. Its two ends are respectively bolted to the telescopic bottom end of the electric cylinder and the bottom end of the guide rod that is slidably installed in the fixed sleeve. The lower mold assembly includes a base plate, a lower template, and cooling water pipes; the base plate and the lower template are fixed together with bolts, and the cooling water pipes are installed on the lower template. The overflow water pipe is provided in five sets, with one end of each set connected to the upper end of the cooling water pan and the other end connected to the middle of one side of the water storage tank.

[0006] Furthermore, the upper mold and lower mold assembly together form a pressing device for the plate heat exchanger product, and the upper mold is also provided with four sets of welding joints, two of which are fixed with welding pressure plates by bolts.

[0007] Furthermore, the upper side of the through hole of the upper mold is connected to a mounting frame by bolts, and the inner side partition of the mounting frame is provided with a round hole and a heat dissipation fan is fixed by bolts. Both the upper and lower sides are open structures, and the top side is also connected to a buckle cover by bolts.

[0008] Furthermore, the base plate is provided with U-shaped frames at its front and rear ends, and T-shaped locking rods are rotatably installed inside the U-shaped frames. The T-shaped locking rods are flipped upward and inserted into the notches on the front and rear sides of the upper mold and locked in place by nuts.

[0009] Furthermore, the base plate is provided with four sets of threaded holes, and the lower template is provided with four sets of stepped insertion holes. The base plate and the lower template are fixed by passing hexagonal bolts through the insertion holes and screwing them into the threaded holes.

[0010] Furthermore, the cooling water pipe has a square pipe structure with continuous curved structures on both the upper and lower sides. The upper cooling water pipe is placed in the slot of the lower template, and the lower cooling water pipe is attached to the bottom side of the lower template.

[0011] Furthermore, one end of the cooling water pipe is connected to a flexible hose, the other end of which is connected to the bottom of the upper water tank, and a drain hole is provided at the bottom of the end of the cooling water pipe.

[0012] The present invention provides a device for reducing thermal deformation during laser welding of plate heat exchangers, which has the following beneficial effects: This invention utilizes the prior immersion of the product in water and the airflow from the cooling fan and water circulation in the cooling water pipes to remove welding heat during laser welding, thereby reducing product deformation.

[0013] In addition, by setting up a cooling water pan and an electric cylinder, the plate heat exchanger product can be immersed in the water in the cooling water pan first. During welding, the product is lifted by the electric cylinder. The immersion of the product in water can be used to instantly remove the welding heat during laser welding, which can reduce the deformation of the product.

[0014] In addition, by setting up an installation frame and connecting a cooling fan inside the installation frame, the airflow blown out by the cooling fan is directed towards the plate heat exchanger product through the through holes during the welding process, thereby reducing the product temperature during the welding process and thus reducing the amount of product deformation.

[0015] In addition, by installing cooling water pipes on the lower template, water from the upper water tank flows into the cooling water pipes through a flexible hose, and flows out through the outlet holes into the cooling water pan along the continuous curved structure of the cooling water pipes. This can reduce the temperature of the lower template, thereby removing the welding heat during laser welding of the product and reducing the amount of product deformation. Moreover, the water in the cooling water pan reaches the height of the overflow pipe and can flow into the water storage tank along the overflow pipe. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below.

[0017] The accompanying drawings described below are only related to some embodiments of the invention and are not intended to limit the invention.

[0018] In the attached diagram: Figure 1 A schematic diagram of the overall structure of the present invention is shown; Figure 2 The present invention is shown Figure 1 Schematic diagram of the structure from the right side (top view); Figure 3 The present invention is shown Figure 1 A schematic diagram of the structure after two sets of electric cylinders drive one upper mold to lift upwards; Figure 4 The present invention is shown Figure 3 Schematic diagram of the front structure; Figure 5 This diagram shows the overall tilting structure of the upper and lower mold assemblies of the present invention after they are connected. Figure 6 The present invention is shown Figure 5 A schematic diagram of the structure after the middle cover and cooling fan are removed upwards; Figure 7 The present invention is shown Figure 6 A schematic diagram of the structure after the middle mounting frame is removed from the upper mold; Figure 8 The present invention is shown Figure 7 A schematic diagram of the structure after the upper and lower mold components are separated; Figure 9 The present invention is shown Figure 8 Schematic diagram of the mid-lateral elevation structure; Figure 10 The present invention is shown Figure 8 A schematic diagram of the structure of a plate heat exchanger after being disassembled sequentially. Figure 11 The present invention is shown Figure 10 A schematic diagram of the structure after the middle base plate and lower template are separated; Figure 12 The present invention is shown Figure 11 Schematic diagram of the mid-side tilting structure.

[0019] List of reference numerals 1. Support frame; 101. Support bracket; 102. Electric cylinder; 103. Fixing sleeve; 1031. Guide rod; 104. Upper water tank; 2. Water storage tank; 3. Water pump; 4. Cooling water pan; 5. Upper mold; 501. Through hole; 502. Welded pressure plate; 503. Notch; 6. Mounting frame; 601. Round hole; 602. Cooling fan; 603. Cover; 7. Lower mold assembly; 701. Base plate; 7011. U-shaped frame; 7012. T-shaped locking rod; 7013. Threaded hole; 702. Lower template; 7021. Slot; 703. Cooling water pipe; 7031. Flexible hose; 7032. Water outlet; 8. Overflow pipe. Detailed Implementation

[0020] To make the objectives, solutions, and advantages of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Unless otherwise stated, the terms used herein have their ordinary meanings in the art. The same reference numerals in the drawings represent the same parts.

[0021] Example 1: Please refer to Figures 1 to 12 : This invention proposes a device for reducing thermal deformation during laser welding of plate heat exchangers, comprising: a support frame 1, a water storage tank 2, a water pump 3, a cooling water pan 4, an upper mold 5, a lower mold assembly 7, and an overflow pipe 8; Support frames 101 are fixed to the top two ends of the support frame 1 by bolts. Two sets of electric cylinders 102 and four sets of fixing sleeves 103 are fixed to the support frame 101 by bolts. A water tank 104 is also installed on one of the support frames 101. The water storage tank 2 and the water pump 3 are respectively installed inside the support frame 1. The cooling water tray 4 is fixed in the middle of the top side of the support frame 1. The water pump 3's pumping pipe is connected to the water storage tank 2, and the water outlet pipe is connected upward to the upper end of the inner side of the upper water tank 104. The upper mold 5 is provided in two sets and is placed in the cooling water pan 4 respectively. Its two ends are respectively bolted to the telescopic bottom end of the electric cylinder 102 and the bottom end of the guide rod 1031 that is slidably installed in the fixed sleeve 103. The lower mold assembly 7 includes a base plate 701, a lower template 702, and a cooling water pipe 703; the base plate 701 and the lower template 702 are fixed together with bolts, and the cooling water pipe 703 is installed on the lower template 702. The base plate 701 is provided with four sets of threaded holes 7013, and the lower template 702 is provided with four sets of stepped insertion holes. The base plate 701 and the lower template 702 are fixed by passing hexagonal socket bolts through the insertion holes and screwing them into the threaded holes 7013. The overflow pipe 8 is provided in five sets, and one end of the five sets of overflow pipe 8 is connected to the upper end of the cooling water pan 4, and the other end is connected to the middle of one side of the water storage tank 2.

[0022] Among them, the electric cylinder 102, water pump 3, and radiator fan 602 are also electrically connected to an external control box (not shown in the figure), and the electric cylinder 102, water pump 3, and radiator fan 602 are controlled through the external control box.

[0023] In embodiments of the present invention, such as Figure 6 and Figure 7 As shown, the upper mold 5 and the lower mold assembly 7 together form the pressing device for the plate heat exchanger product, and the upper mold 5 is also provided with four sets of welding joints, two of which are fixed with welding pressure plates 502 by bolts.

[0024] In embodiments of the present invention, such as Figure 1 , Figures 6 to 8 As shown, the upper side of the through hole 501 of the upper mold 5 is connected to the mounting frame 6 by bolts. The inner partition of the mounting frame 6 has a round hole 601, and a heat dissipation fan 602 is fixed by bolts. Both the upper and lower sides are open structures, and the top side is also connected to the cover 603 by bolts. During the welding process of the plate heat exchanger product, the airflow blown out by the heat dissipation fan 602 is blown towards the plate heat exchanger product through the through hole 501, thereby reducing the product temperature during the welding process and thus reducing the deformation of the product.

[0025] In embodiments of the present invention, such as Figure 5 , Figure 8 and Figure 10 As shown, the front and rear ends of the base plate 701 are respectively provided with U-shaped frames 7011, and T-shaped locking rods 7012 are rotatably installed inside the U-shaped frames 7011. The T-shaped locking rods 7012 are flipped upward and inserted into the notches 503 on the front and rear sides of the upper mold 5 and locked by nuts. When the plate heat exchanger product is inserted into the lower mold plate 702, the upper mold 5 is moved downward and attached to the product by the electric cylinder 102. Then, the T-shaped locking rods 7012 can be flipped upward into the notches 503 and locked by nuts, thereby fixing the plate heat exchanger product.

[0026] In embodiments of the present invention, such as Figure 11 and Figure 12 As shown, the cooling water pipe 703 has a square pipe structure with continuous curved structures on both the upper and lower sides. The upper cooling water pipe 703 is placed in the slot 7021 of the lower template 702, and the lower cooling water pipe 703 is attached to the bottom side of the lower template 702. One end of the cooling water pipe 703 is connected to a flexible hose 7031, and the other end of the flexible hose 7031 is connected to the bottom end of the upper water tank 104. The bottom end of the cooling water pipe 703 is also provided with a drain hole 7032. During the laser welding process of the plate heat exchanger product, the water in the upper water tank 104 flows into the cooling water pipe 703 through the flexible hose 7031, and flows out into the cooling water pan 4 through the drain hole along the continuous curved structure of the cooling water pipe 703. This can reduce the temperature of the lower template 702, thereby removing the welding heat during laser welding of the product and reducing the deformation of the product.

[0027] The specific usage and function of this embodiment are as follows: In this invention, the upper mold 5 is lifted upward by the electric cylinder 102, and then the plate heat exchanger product is inserted into the lower mold plate 702. The upper mold 5 is then moved downward by the electric cylinder 102 and attached to the product. The T-shaped locking rod 7012 is flipped upward into the notch 503 and locked by the nut, thereby fixing the plate heat exchanger product. First, the plate heat exchanger product is immersed in the water in the cooling water pan 4. The product is then lifted by an electric cylinder before welding. The radiator fan 602 is turned on, and the airflow blown by the radiator fan 602 blows onto the plate heat exchanger product through the through hole 501. The water pump 3 sends the water in the water storage tank 2 into the upper water tank 104 through the pipe, and then flows into the cooling water pipe 703 through the hose 7031. The water flows out into the cooling water pan 4 through the outlet hole 7032 along the continuous curved structure of the cooling water pipe 703, reducing the temperature of the lower template 702. The water in the cooling water pan 4 reaches the height of the overflow pipe 8 and can flow into the water storage tank 2 along the overflow pipe 8. With the product's previous immersion in water and the action of the airflow from the radiator fan 602 and the water circulation in the cooling water pipe 703, the welding heat can be carried away during the laser welding of the product, reducing the deformation of the product.

[0028] The following points should be noted in this article: 1. The accompanying drawings of the embodiments of the present invention only involve the structures involved in the embodiments of the present invention; other structures can refer to general designs.

[0029] 2. Where there is no conflict, the embodiments of the present invention and the features thereof can be combined with each other to obtain new embodiments.

[0030] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A device for reducing thermal deformation during laser welding of a plate heat exchanger, comprising: Support frame (1), water tank (2), water pump (3), cooling water pan (4), upper mold (5), lower mold assembly (7) and overflow pipe (8); The feature is that the top two ends of the support frame (1) are respectively fixed with support frames (101) by bolts, and two sets of electric cylinders (102) and four sets of fixing sleeves (103) are respectively fixed on the support frames (101) by bolts. One set of support frames (101) is also equipped with an upper water tank (104). The water storage tank (2) and the water pump (3) are respectively installed on the inner side of the support frame (1). The cooling water tray (4) is fixed in the middle of the top side of the support frame (1). The water pump (3)'s pumping pipe is connected to the water storage tank (2), and the water outlet pipe is connected upward to the upper end of the inner side of the upper water tank (104). The upper mold (5) is provided in two sets and is placed in the cooling water pan (4) respectively. Its two ends are respectively bolted to the telescopic bottom end of the electric cylinder (102) and the bottom end of the guide rod (1031) that is slidably installed in the fixed sleeve (103). The lower mold assembly (7) includes a base plate (701), a lower template (702), and a cooling water pipe (703); the base plate (701) and the lower template (702) are bolted together, and the cooling water pipe (703) is installed on the lower template (702); The base plate (701) is also provided with U-shaped frames (7011) at the front and rear ends respectively, and T-shaped locking rods (7012) are rotatably installed inside the U-shaped frames (7011). The T-shaped locking rods (7012) are flipped upward and inserted into the notches (503) on the front and rear sides of the upper mold (5) respectively and locked by nuts. The overflow pipe (8) is provided in five sets, and one end of the five sets of overflow pipes (8) is connected to the upper end of the cooling water pan (4), and the other end is connected to the middle of one side of the water storage tank (2).

2. The device for reducing thermal deformation during laser welding of a plate heat exchanger according to claim 1, characterized in that: The upper mold (5) and the lower mold assembly (7) together form a pressing device for the plate heat exchanger product. The upper mold (5) is also provided with four sets of welding joints, two of which are fixed with welding pressure plates (502) by bolts.

3. The device for reducing thermal deformation during laser welding of a plate heat exchanger according to claim 1, characterized in that: The upper mold (5) has a mounting frame (6) connected to the upper side of the through hole (501) by bolts. The inner partition of the mounting frame (6) has a round hole (601) and a heat dissipation fan (602) is fixed by bolts. Both the upper and lower sides are open structures, and the top side is also connected to a buckle (603) by bolts.

4. The device for reducing thermal deformation during laser welding of a plate heat exchanger according to claim 1, characterized in that: The base plate (701) is provided with four sets of threaded holes (7013), and the lower template (702) is provided with four sets of stepped insertion holes. The base plate (701) and the lower template (702) are fixed by passing an internal hex bolt through the insertion hole and screwing it into the threaded hole (7013).

5. The device for reducing thermal deformation during laser welding of a plate heat exchanger according to claim 1, characterized in that: The cooling water pipe (703) is a square pipe structure with continuous curved structures on both the upper and lower sides. The upper cooling water pipe (703) is placed in the slot (7021) of the lower template (702), and the lower cooling water pipe (703) is attached to the bottom side of the lower template (702).

6. The device for reducing thermal deformation during laser welding of a plate heat exchanger according to claim 1, characterized in that: One end of the cooling water pipe (703) is connected to a hose (7031), and the other end of the hose (7031) is connected to the bottom end of the upper water tank (104). A drain hole (7032) is also provided at the bottom end of the cooling water pipe (703).

Images