A welded plate heat exchanger

Abstract

This invention relates to the field of heat exchange device technology, specifically to a welded plate heat exchanger, which includes a core assembly. The core assembly includes a first flow channel plate, a second flow channel plate, and a connecting structure. The first and second flow channel plates overlap and are interlocked along their length, achieving stable assembly of the core assembly to the housing without additional fasteners, simplifying the assembly process and reducing assembly costs. The interlocking of the first and second flow channel plates forms multiple independent and inclined first and second flow channels, preventing cross-flow of the first and second media and ensuring a stable and controllable heat exchange process. Simultaneously, the connecting structure connects multiple first or second flow channels according to a preset transport path, guiding the first and second media to fully flow through all channels, maximizing the utilization of the heat exchange area and enhancing the media heat exchange effect.

Description

Technical Field

[0001] This invention relates to the field of heat exchange device technology, and in particular to a welded plate heat exchanger. Background Technology

[0002] The all-welded plate heat exchanger is a compact, efficient, and structurally stable heat exchange device with excellent heat transfer performance. It is suitable for various industrial fields such as petrochemical, food, pharmaceutical, and power, and can meet the heat transfer requirements under diverse operating conditions. The core component of this equipment is the core, which is composed of stacked and welded stamped metal heat exchange plates. The plate surface is designed with a corrugated structure, which effectively enhances fluid turbulence and improves heat transfer efficiency. The plates are welded together to form completely sealed flow channels, constituting independent cold medium and hot medium channels. During operation, the cold and hot media enter their respective channels through connecting pipes and flow in opposite or staggered directions within the core. The cold and hot media exchange heat efficiently through the plate walls, utilizing the plates' excellent thermal conductivity to achieve rapid heat transfer. After heat exchange, the cold and hot media are discharged through their corresponding connecting pipes.

[0003] Existing all-welded plate heat exchangers generally employ a zigzag flow channel layout, which enhances the turbulence of the internal medium and improves heat exchange efficiency. However, the zigzag structure creates dead zones that are difficult for the medium to reach, resulting in ineffective use of the heat exchange area and reducing the overall utilization rate of the heat exchange area. Furthermore, in terms of manufacturing processes, existing cores require the assembly and welding of multiple independently stamped metal plates, leading to cumbersome procedures, low production efficiency, increased production cycle and manufacturing costs, and increased risk of process errors due to the greater amount of manual intervention, ultimately significantly raising the overall production cost of the equipment. Summary of the Invention

[0004] Therefore, it is necessary to provide a welded plate heat exchanger to address the problems of low core heat exchange area utilization and cumbersome core production process in current all-welded plate heat exchangers.

[0005] The above objectives are achieved through the following technical solutions: A welded plate heat exchanger, comprising: Box enclosure.

[0006] A core assembly includes a first flow channel plate, a second flow channel plate, and a connecting structure. The first and second flow channel plates are located inside the housing, and their outer walls abut against the inner wall of the housing. The first and second flow channel plates overlap and interlock along their length. The first and second flow channel plates together form multiple independent first flow channels. Each of the first and second flow channel plates forms multiple independent second flow channels. The connecting structure is used to connect multiple first flow channels or multiple second flow channels according to a preset conveying path.

[0007] The extension directions of the first flow channel and the second flow channel are both inclined at a preset angle to the width direction of the first flow channel plate or the second flow channel plate. In multiple planes parallel to the side wall of the box and having the first flow channel or the second flow channel, there is a first flow channel or the second flow channel that extends along the diagonal direction of the side wall of the first flow channel plate or the second flow channel plate.

[0008] Furthermore, both the first flow channel plate and the second flow channel plate are formed by bending plates with the same structure.

[0009] Furthermore, the plate is configured as a plate-shaped structure with a periodic wave structure, the cross-section of which has continuously alternating convex and concave portions, and the extension direction of the wave structure forms a preset inclined angle with the length direction of the plate.

[0010] One of the plates is bent multiple times along its length in a first bending sequence to form the first flow channel plate; the other plate is bent multiple times along its length in a direction opposite to the first bending sequence to form the second flow channel plate.

[0011] Furthermore, the first flow channel plate includes a plurality of first unit plates arranged sequentially along its length direction, and the second flow channel plate includes a plurality of second unit plates arranged sequentially along its length direction.

[0012] The first flow channel plate and the second flow channel plate are alternately provided with a first spacing segment and a second spacing segment along their own length direction.

[0013] In the first spacing segment, the spacing between two adjacent first unit boards or two adjacent second unit boards is the first spacing; in the second spacing segment, the spacing between two adjacent first unit boards or two adjacent second unit boards is the second spacing, and the first spacing is greater than the second spacing.

[0014] In the length direction, the first spacing segment in the first flow channel plate or the second flow channel plate is inserted into the second spacing segment in the second flow channel plate or the first flow channel plate, such that each of the protrusions on the inner side of the two first unit plates or the two second unit plates in the first spacing segment abuts against one of the protrusions on the outer side of the two second unit plates or the two first unit plates in the second spacing segment, so that each of the recesses on the inner side of the two first unit plates or the two second unit plates in the first spacing segment surrounds one of the recesses on the outer side of the two second unit plates or the two first unit plates in the second spacing segment to form the first flow channel.

[0015] Furthermore, in the second spacing section, an isolation plate is fixedly provided between two adjacent first unit plates or two adjacent second unit plates. The isolation plate is fixedly connected to the inner wall of the box and divides the space between two first unit plates or two second unit plates into multiple independent second flow channels. A reserved channel is provided between the isolation plate and the inner wall of the box.

[0016] Furthermore, the connecting structure includes a plurality of first connecting pipes, which are disposed at the upper and lower ends of the inner wall of the box. The plurality of first connecting pipes are used to connect all the first flow channels inside the box into a plurality of continuous first channels according to a preset first conveying path.

[0017] Furthermore, the connection structure also includes a plurality of second connecting pipes and a plurality of reversing pipes; the plurality of second connecting pipes are disposed at the upper and lower ends of the inner wall of the box, and each second connecting pipe connects to a plurality of second flow channels; the plurality of reversing pipes are fixedly installed on the outside of the box and connect two adjacent second connecting pipes; the plurality of second connecting pipes and the plurality of reversing pipes are used to connect all the second flow channels inside the box in series into a plurality of continuous second channels according to a preset second conveying path.

[0018] Furthermore, it also includes a liquid inlet assembly and a liquid outlet assembly; the liquid inlet assembly is used to introduce a first medium into the first flow channel and a second medium into the second flow channel; the liquid outlet assembly is used to collect and discharge the first medium flowing through the first flow channel, and to collect and discharge the second medium flowing through the second flow channel.

[0019] Furthermore, the liquid inlet assembly includes a first liquid inlet pipe, a first distribution pipe, a second liquid inlet pipe, and a second distribution pipe; the first liquid inlet pipe and the first distribution pipe are fixedly connected to the first side wall of the housing and communicate with each other, and the first distribution pipe is used to evenly distribute the first medium entering the first liquid inlet pipe to a plurality of first flow channels; the second liquid inlet pipe and the second distribution pipe are fixedly connected to the upper wall of the housing and communicate with each other, and the second distribution pipe is used to evenly distribute the second medium entering the second liquid inlet pipe to a plurality of second flow channels.

[0020] Furthermore, the liquid outlet assembly includes a first collection pipe, a first outlet pipe, a second collection pipe, and a second outlet pipe; the first collection pipe and the first outlet pipe are fixedly connected to the second side wall of the housing and communicate with each other, and the first collection pipe is used to collect the first medium flowing out from the plurality of first channels and guide it to the first outlet pipe; the second collection pipe and the second outlet pipe are fixedly connected to the upper wall of the housing and communicate with each other, and the second collection pipe is used to collect the second medium flowing out from the plurality of second channels and guide it to the second outlet pipe.

[0021] The beneficial effects of this invention are: This invention provides a welded plate heat exchanger, including a housing and a core assembly. The core assembly includes a first flow channel plate, a second flow channel plate, and a connecting structure.

[0022] The first and second flow channel plates overlap and interlock along their lengths, with their outer walls abutting against the inner wall of the housing. Together, they form multiple independent first flow channels and, simultaneously, multiple independent second flow channels. This allows for stable assembly of the core assembly without additional fixing components, simplifying the assembly process and reducing manufacturing costs. Furthermore, the combined effect of the first and second flow channel plates preventing cross-flow between the first and second media ensures a stable and controllable heat exchange process.

[0023] Furthermore, the extension directions of the first and second flow channels are both at a preset angle to the width direction of the flow channel plate, which can guide the first and second media to form turbulence and extend the flow path of the first and second media in the flow channels. In multiple planes parallel to the side wall of the box and having a first or second flow channel, there is a first or second flow channel extending along the diagonal direction of the side wall of the first or second flow channel plate. With the help of the connecting structure, the multiple first or second flow channels are connected in an orderly manner, which can ensure that the first and second media flow through the entire heat exchange area along the preset transport path, maximize the utilization of the heat exchange area, and thus significantly improve the heat exchange efficiency and operational stability of the heat exchanger. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the first flow channel plate and the second flow channel plate in a welded plate heat exchanger provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of a welded plate heat exchanger provided in an embodiment of the present invention; Figure 3 for Figure 2 Side view of the structure shown; Figure 4 for Figure 3 A cross-sectional view along the AA direction; Figure 5 for Figure 3 Cross-sectional view along the BB direction; Figure 6 for Figure 3 A cross-sectional view along the CC direction; Figure 7 for Figure 3 A cross-sectional view along the DD direction; Figure 8 for Figure 4 A magnified view of a section at point E in the middle; Figure 9 for Figure 5 A magnified view of a section at point F in the middle; Figure 10 for Figure 7 A magnified view of a section at point G in the middle; Figure 11 This is a schematic diagram of the structure of the plates in a welded plate heat exchanger provided in an embodiment of the present invention; Figure 12 for Figure 11 A magnified view of a section at point H in the middle; Figure 13 This is a schematic diagram of the structure of a welded plate heat exchanger in which plates are bent into a first flow channel plate, according to an embodiment of the present invention. Figure 14 This is a schematic diagram of the structure of a welded plate heat exchanger in which plates are bent into a second flow channel plate, according to an embodiment of the present invention.

[0025] in: 110. Box body; 210, Plate; 220, First flow channel plate; 221, First unit plate; 230, Second flow channel plate; 231, Second unit plate; 240, Isolation plate; 250, First connecting pipe; 260, Second connecting pipe; 270, Reversing pipe; 310, First inlet pipe; 311, First distribution pipe; 320, First outlet pipe; 321, First collection pipe; 330, Second inlet pipe; 331, Second distribution pipe; 340, Second outlet pipe; 341, Second collection pipe. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0027] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0028] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0029] The following reference Figures 1 to 14 This invention describes a welded plate heat exchanger, which includes a housing 110, an inlet assembly, an outlet assembly, and a core assembly.

[0030] Specifically, the enclosure 110 is a closed cavity structure, fixedly placed on the ground or other fixed support surface, used to provide a sealed and independent working environment for the stable operation of the core assembly, preventing the intrusion of external impurities and leakage of internal media.

[0031] The liquid inlet assembly includes a first liquid inlet pipe 310, a first distribution pipe 311, a second liquid inlet pipe 330, and a second distribution pipe 331.

[0032] The first inlet pipe 310 is a rigid tubular structure, fixedly connected to the first side wall of the housing 110. One end of the first inlet pipe 310 is sealed and connected to an external first medium supply device, and the other end is sealed and connected to the first distribution pipe 311. The first distribution pipe 311 is a rigid tubular structure, extending linearly along the height of the housing 110. The first distribution pipe 311 is located at the first edge of the first side wall of the housing 110 and is fixedly connected to the first side wall of the housing 110. The first distribution pipe 311 is used to evenly transport the first medium from the external first medium supply device, delivered through the first inlet pipe 310, from the first edge of the first side wall of the housing 110 into the interior of the housing 110.

[0033] The second inlet pipe 330 is a rigid tubular structure, fixedly installed on the upper wall of the housing 110. One end of the second inlet pipe 330 is sealed and connected to the external second medium supply device, and the other end is sealed and connected to the second distribution pipe 331. The second distribution pipe 331 is a rigid tubular structure, extending linearly along the width direction of the housing 110. The second distribution pipe 331 is located at the second edge of the upper wall of the housing 110 and is fixedly installed on the upper wall of the housing 110. The second distribution pipe 331 is used to stably transport the second medium from the external second medium supply device, delivered through the second inlet pipe 330, from the front and rear walls of the housing 110 near the second edge to the interior of the housing 110.

[0034] In this system, the first medium is the heat exchange medium, and the second medium is the heat exchange medium. The properties of the two media have a clear and fixed correspondence. Furthermore, the properties of the two media can be interchanged or adjusted according to actual operating conditions.

[0035] The liquid dispensing assembly includes a first collection tube 321, a first liquid dispensing tube 320, a second collection tube 341, and a second liquid dispensing tube 340.

[0036] The first collecting pipe 321 is a rigid tubular structure that extends linearly along the width of the housing 110. It is located at the third edge of the second sidewall of the housing 110 and is fixedly installed thereon. The first outlet pipe 320 is also a rigid tubular structure, with one end sealed to the first collecting pipe 321 and the other end sealed to an external first medium recovery device. The first medium, having completed its heat exchange process inside the housing 110, collects entirely within the first collecting pipe 321. The first collecting pipe 321 guides the entire first medium into the first outlet pipe 320, ultimately delivering it to the external first medium recovery device.

[0037] The second collecting pipe 341 is a rigid tubular structure that extends linearly along the width of the housing 110. It is located at the fourth edge of the upper wall of the housing 110 and is fixedly installed thereon. The second outlet pipe 340 is also a rigid tubular structure, with one end sealed to the second collecting pipe 341 and the other end sealed to an external second medium recovery device. The second medium, having completed its heat exchange process inside the housing 110, will all collect inside the second collecting pipe 341. The second collecting pipe 341 guides all the second medium into the second outlet pipe 340, ultimately delivering it to the external second medium recovery device.

[0038] The core assembly includes a first flow channel plate 220, a second flow channel plate 230, and a connecting structure.

[0039] Both the first flow channel plate 220 and the second flow channel plate 230 are formed from the same plate 210 through a directional bending process. The plate 210 is a metal plate structure with a periodic wave structure. Its cross-section shows a continuous alternating distribution of convex and concave parts. The extension direction of the wave structure forms a preset inclined angle with the length direction of the plate 210 to enhance the turbulence intensity of the medium and improve the heat transfer efficiency.

[0040] The first flow channel plate 220 is formed by bending a single plate 210 multiple times along its length according to a preset first bending sequence. The second flow channel plate 230 is formed by bending another plate 210 multiple times along its length in a direction completely opposite to the first bending sequence. Thus, by using plates 210 with identical structures to form the first flow channel plate 220 and the second flow channel plate 230 through a directional bending process, the production standards of the core components are unified, the processing steps of the core assembly are greatly simplified, and the manufacturing difficulty and cost are reduced.

[0041] The first flow channel plate 220, which is formed by bending, includes a plurality of first unit plates 221 arranged sequentially along its length direction. Each first unit plate 221 has a protrusion or recess extending along its diagonal. The second flow channel plate 230, which is formed by bending, includes a plurality of second unit plates 231 arranged sequentially along its length direction. Each second unit plate 231 has a protrusion or recess extending along its diagonal.

[0042] The first flow channel plate 220 and the second flow channel plate 230 are each alternately provided with a first spacing segment and a second spacing segment along their own length direction. In the first spacing segment, the spacing between two adjacent first unit plates 221 or two adjacent second unit plates 231 is the first spacing; in the second spacing segment, the spacing between two adjacent first unit plates 221 or two adjacent second unit plates 231 is the second spacing, and the value of the first spacing is greater than the value of the second spacing, thereby forming a periodic structure with alternating density.

[0043] The first spacing segment on the first flow channel plate 220 and the corresponding second spacing segment on the second flow channel plate 230 are interlocked along their respective lengths, and the second spacing segment of the first flow channel plate 220 and the first spacing segment of the second flow channel plate 230 are interlocked. After overlapping and interlocking, the first flow channel plate 220 and the second flow channel plate 230 are fixedly installed inside the housing 110, and the outer walls of both the first flow channel plate 220 and the second flow channel plate 230 are tightly abutting against the inner wall of the housing 110.

[0044] In the insertion state, each protrusion on the inner side of the two first unit plates 221 or the two second unit plates 231 in the first spacing segment abuts tightly against a protrusion on the outer side of the two second unit plates 231 or the two first unit plates 221 in the inserted second spacing segment, thereby forming an independent and sealed first flow channel by surrounding each recess on the inner side of the two first unit plates 221 or the two second unit plates 231 in the first spacing segment and a recess on the outer side of the two second unit plates 231 or the two first unit plates 221 in the inserted second spacing segment. The first flow channel is used to provide a flow passage for the first medium.

[0045] Within the second spacing section, due to the direct effect of the bending process, the corresponding recesses on the two first unit plates 221 or the two second unit plates 231 extend in different directions, extending towards the front and rear walls of the housing 110 respectively. Based on this, within the second spacing section, a partition plate 240 is fixedly installed in the space between adjacent first unit plates 221 or adjacent second unit plates 231. The partition plate 240 is a rigid plate structure, fixedly connected to the inner wall of the housing 110, and has a reserved channel between the partition plate 240 and the inner wall of the housing 110 for the passage of the first or second medium. The partition plate 240 is used to divide the space between the two first unit plates 221 or the two second unit plates 231 within the second spacing section into multiple independent second flow channels, which provide a flow path for the second medium.

[0046] Thus, by precisely inserting the first flow channel plate 220 and the second flow channel plate 230, regular and independent first and second flow channels are formed. Along the length of the housing 110, the first and second flow channels are arranged alternately, and the first and second flow channels are evenly distributed throughout the entire area inside the housing 110, thereby maximizing the heat exchange contact area between the first and second media.

[0047] All the first flow channels located on the first edge of the first side wall of the housing 110 are connected to the first distribution pipe 311, thereby forming a complete first medium transport path through the first distribution pipe 311 and the first liquid inlet pipe 310; all the second flow channels located on the second edge of the upper wall of the housing 110 are connected to the second distribution pipe 331, thereby forming a complete second medium transport path through the second distribution pipe 331 and the second liquid inlet pipe 330; all the first flow channels located on the third edge of the second side wall of the housing 110 are connected to the first collection pipe 321, thereby forming a complete first medium discharge path through the first collection pipe 321 and the first liquid outlet pipe 320; all the second flow channels located on the fourth edge of the upper wall of the housing 110 are connected to the second collection pipe 341, thereby forming a complete second medium discharge path through the second collection pipe 341 and the second liquid outlet pipe 340.

[0048] The connection structure includes multiple first connecting pipes 250, multiple second connecting pipes 260, and multiple reversing pipes 270.

[0049] The first connecting pipe 250 is a tubular groove structure directly formed on the inner walls of the upper and lower ends of the housing 110, extending along the width direction of the housing 110. Each first connecting pipe 250 has two connecting ports facing the interior of the housing 110, both of which are connected to the first flow channel, and the positions of the connecting ports are precisely aligned with the ends of the first flow channel. Multiple first connecting pipes 250 are evenly arranged along the length direction of the housing 110, connecting the first flow channels at different positions to connect all the first flow channels inside the housing 110 into a continuous and complete first passage, providing a fixed and unique path for the flow of the first medium, ensuring that the first medium flows within the housing 110 according to the preset first conveying path.

[0050] The second connecting pipe 260 is a tubular groove structure directly formed on the upper and lower inner walls of the housing 110, extending along the width of the housing 110 and parallel to the first connecting pipe 250. Each second connecting pipe 260 has an opening facing the interior of the housing 110, which communicates with multiple second flow channels, and the coverage of the opening perfectly matches the end position of the corresponding second flow channel. Multiple reversing pipes 270 are rigid tubular structures, fixedly installed on the exterior of the housing 110 and penetrating the wall of the housing 110. Each reversing pipe 270 has two ends connected to two adjacent second connecting pipes 260. The multiple second connecting pipes 260 and the multiple reversing pipes 270 form a combined series structure, connecting all the second flow channels inside the housing 110 into a continuous and complete second passage, providing a fixed and unique path for the flow of the second medium, and ultimately ensuring that the second medium flows within the housing 110 according to the preset second delivery path.

[0051] In a plurality of planes parallel to the sidewall of housing 110, each plane containing the plurality of first flow channels is defined as a flow plane. The first flow plane and the second flow plane, which are close to the first sidewall of housing 110, together constitute the first flow unit. The third flow plane and the fourth flow plane, in turn, constitute the next flow unit, and so on. All flow planes form multiple flow units according to this rule.

[0052] Taking the first flow unit as an example, the first transport path of the first medium is described in detail.

[0053] After the first flow channel plate 220 and the second flow channel plate 230 are bent and connected, the channels in the first flow plane and the second flow plane extend in opposite directions, respectively towards the front and rear walls of the housing 110. The first flow plane has a first channel extending diagonally along its own diagonal, dividing the first flow plane into a first region above the first channel and a second region below the first channel. Similarly, the second flow plane has a second channel extending diagonally along its own diagonal, dividing the second flow plane into a third region above the second channel and a fourth region below the second channel.

[0054] The specific flow direction of the first conveying path is as follows: Figure 3Based on the perspective, the specific process is as follows: After being transported through the first inlet pipe 310 and the first distribution pipe 311, the first medium flows in from the left side of the first region of the first flow plane, and flows obliquely to the upper right along the extension direction of the first channel in the first flow plane until it reaches the upper edge of the first region; subsequently, the first medium flows through the first connecting pipe 250 that connects the upper ends of the first flow plane and the second flow plane, and flows into the interior of the second flow plane from the upper edge of the third region in the second flow plane, flowing obliquely to the lower right along the extension direction of the second channel until it reaches the right edge of the third region; immediately afterward, the first medium flows through the flow channel between the inner wall of the right side of the housing 110 and the recess of the outer wall of the first flow channel plate 220 or the second flow channel plate 230, and re-enters the interior of the first flow plane from the right edge of the second region in the first flow plane, flowing along the first... The channel extends in a downward-southward trajectory until it reaches the lower edge of the second region. Then, the first medium flows through the first connecting pipe 250, which connects the lower ends of the first and second flow planes, and flows back into the second flow plane from the lower edge of the fourth region of the second flow plane. It then flows in a downward-southward trajectory along the extension direction of the second channel until it reaches the left edge of the fourth region. Finally, the first medium flows through the channel between the inner left wall of the housing 110 and the recessed part of the outer wall of the first flow channel plate 220 or the second flow channel plate 230, and flows out of the first flow unit from the left edge of the fourth region of the second flow plane, entering the third flow plane of the next flow unit. The first medium in all subsequent flow units completes the flow along the same path, thus forming a circulating first conveying path that runs through all flow units.

[0055] Along the length of the housing 110, the first second spacing segment and the second second spacing segment near the first side wall of the housing 110 are defined together as the first flow unit. The subsequent third and fourth second spacing segments are defined as the next flow unit in turn, and so on. All second spacing segments form multiple flow units according to this rule.

[0056] Among the multiple planes parallel to the sidewall of the housing 110, each plane containing the multiple second flow channels is defined as a motion plane. Specifically, the first and second motion planes, located near the first sidewall of the housing 110, are situated on either side of the partition plate 240 within the first second spacing section; the third and fourth motion planes are situated on either side of the partition plate 240 within the second second spacing section. The first, second, third, and fourth motion planes together constitute a complete flow unit.

[0057] Taking the first circulation unit as an example, the second transport path of the second medium will be described in detail.

[0058] After the first flow channel plate 220 and the second flow channel plate 230 are bent and connected, the channels in the first and second moving planes extend in opposite directions, and the channels in the first and second moving planes extend towards the front and rear walls of the housing 110 respectively; the channel extension direction of the third moving plane is the same as that of the second moving plane, and the channel extension direction of the fourth moving plane is the same as that of the first moving plane.

[0059] The first motion plane has a third channel extending diagonally along its own diagonal. Using the third channel as a boundary, the first motion plane is divided into a first section above the third channel and a second section below the third channel. The second motion plane has a fourth channel extending diagonally along its own diagonal. Using the fourth channel as a boundary, the second motion plane is divided into a third section above the fourth channel and a fourth section below the fourth channel. The third motion plane has a fifth channel extending diagonally along its own diagonal. Using the fifth channel as a boundary, the third motion plane is divided into a fifth section above the fifth channel and a sixth section below the fifth channel. The fourth motion plane has a sixth channel extending diagonally along its own diagonal. Using the sixth channel as a boundary, the fourth motion plane is divided into a seventh section above the sixth channel and an eighth section below the sixth channel.

[0060] The specific flow direction of the second conveying path is as follows: Figure 3 Based on the perspective, the specific process is as follows: After being transported through the second inlet pipe 330 and the second distribution pipe 331, the second medium is completely drawn into the second connecting pipe 260 above the first and second moving planes. This part of the second medium is divided into two streams that flow synchronously. The first stream of the second medium flows in from the upper edge of the first partition of the first moving plane, flows obliquely to the lower left along the extension direction of the third channel until it reaches the left edge of the first partition, then flows through the reserved channel between the isolation plate 240 and the left inner wall of the box 110, flows into the interior of the second moving plane from the left edge of the fourth partition of the second moving plane, flows obliquely to the lower right along the extension direction of the fourth channel until it reaches the second connecting pipe 260 below the first and second moving planes; the second stream of the second medium flows in from the upper edge of the third partition of the second moving plane, flows obliquely to the lower right along the extension direction of the fourth channel until it reaches the right edge of the third partition, then flows through the reserved channel between the isolation plate 240 and the right inner wall of the box 110, flows into the interior of the first moving plane from the right edge of the second partition of the first moving plane, flows obliquely to the lower left along the extension direction of the third channel until it reaches the second connecting pipe 260 below the first and second moving planes.

[0061] The two streams of second medium flowing into the second connecting pipe 260 below the first and second motion planes are completely converged. The converged second medium is then stably transported to the second connecting pipe 260 below the third and fourth motion planes through the reversing pipes 270 at both ends of the second connecting pipe 260. The second medium entering the second connecting pipe 260 is then divided into two streams that flow synchronously again. The first stream of the second medium flows in from the lower edge of the sixth section of the third motion plane, flows obliquely to the upper left along the extension direction of the fifth channel, then flows through the reserved channel between the isolation plate 240 and the left inner wall of the box 110, enters the seventh section of the fourth motion plane, and flows obliquely to the upper right along the extension direction of the sixth channel until it flows into the second connecting pipe 260 above the third and fourth motion planes; the second stream of the second medium flows in from the lower edge of the eighth section of the fourth motion plane, flows obliquely to the upper right along the extension direction of the sixth channel, then flows through the reserved channel between the isolation plate 240 and the right inner wall of the box 110, enters the fifth section of the third motion plane, and flows obliquely to the upper left along the extension direction of the fifth channel until it flows into the second connecting pipe 260 above the third and fourth motion planes.

[0062] The two streams of second medium flowing into the second connecting pipe 260 above the third and fourth motion planes are completely converged. The converged second medium is then stably transported to the second connecting pipe 260 above the fifth and sixth motion planes in the next flow unit through the reversing pipes 270 at both ends of the second connecting pipe 260. The second medium in all subsequent flow units flows along the same path, thus forming a cyclic second transport path that runs through all flow units.

[0063] In summary, by using plates 210 with identical structures bent in the opposite direction to form the first flow channel plate 220 and the second flow channel plate 230, and by using a plug-in combination method, multiple first flow channels and multiple second flow channels are constructed alternately arranged along the length of the housing 110. With the help of the connecting structure, the first medium and the second medium are guided to complete the circulation flow along the preset conveying path, so that the first medium and the second medium can fully flow through the entire heat exchange area of ​​the core assembly, thereby maximizing the utilization rate of the heat exchange area.

[0064] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0065] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A welded plate heat exchanger, characterized in that, include: Box; A core assembly includes a first flow channel plate, a second flow channel plate, and a connecting structure. The first and second flow channel plates are located inside the housing, and their outer walls abut against the inner wall of the housing. The first and second flow channel plates overlap and interlock along their length. The first and second flow channel plates together form multiple independent first flow channels. Each of the first and second flow channel plates forms multiple independent second flow channels. The connecting structure is used to connect multiple first flow channels or multiple second flow channels according to a preset conveying path. The extension directions of the first flow channel and the second flow channel are both inclined at a preset angle to the width direction of the first flow channel plate or the second flow channel plate. In multiple planes parallel to the side wall of the box and having the first flow channel or the second flow channel, there is a first flow channel or the second flow channel that extends along the diagonal direction of the side wall of the first flow channel plate or the second flow channel plate.

2. The welded plate heat exchanger according to claim 1, characterized in that, Both the first flow channel plate and the second flow channel plate are formed by bending plates with the same structure.

3. The welded plate heat exchanger according to claim 2, characterized in that, The plate is configured as a plate-shaped structure with a periodic wave structure, the cross-section of which has continuously alternating convex and concave portions, and the extension direction of the wave structure forms a preset inclined angle with the length direction of the plate. One of the plates is bent multiple times along its length in a first bending sequence to form the first flow channel plate; the other plate is bent multiple times along its length in a direction opposite to the first bending sequence to form the second flow channel plate.

4. The welded plate heat exchanger according to claim 3, characterized in that, The first flow channel plate includes a plurality of first unit plates arranged sequentially along its length direction, and the second flow channel plate includes a plurality of second unit plates arranged sequentially along its length direction. The first flow channel plate and the second flow channel plate are alternately provided with a first spacing segment and a second spacing segment along their own length direction; In the first spacing segment, the spacing between two adjacent first unit boards or two adjacent second unit boards is the first spacing; in the second spacing segment, the spacing between two adjacent first unit boards or two adjacent second unit boards is the second spacing, and the first spacing is greater than the second spacing. In the length direction, the first spacing segment in the first flow channel plate or the second flow channel plate is inserted into the second spacing segment in the second flow channel plate or the first flow channel plate, such that each of the protrusions on the inner side of the two first unit plates or the two second unit plates in the first spacing segment abuts against one of the protrusions on the outer side of the two second unit plates or the two first unit plates in the second spacing segment, so that each of the recesses on the inner side of the two first unit plates or the two second unit plates in the first spacing segment surrounds one of the recesses on the outer side of the two second unit plates or the two first unit plates in the second spacing segment to form the first flow channel.

5. The welded plate heat exchanger according to claim 4, characterized in that, In the second spacing section, an isolation plate is fixedly provided between two adjacent first unit plates or two adjacent second unit plates. The isolation plate is fixedly connected to the inner wall of the box and divides the space between two first unit plates or two second unit plates into multiple independent second flow channels. A reserved channel is provided between the isolation plate and the inner wall of the box.

6. The welded plate heat exchanger according to claim 1, characterized in that, The connection structure includes a plurality of first connecting pipes, which are disposed at the upper and lower ends of the inner wall of the box. The plurality of first connecting pipes are used to connect all the first flow channels inside the box into a plurality of continuous first channels according to a preset first conveying path.

7. The welded plate heat exchanger according to claim 6, characterized in that, The connection structure further includes multiple second connecting pipes and multiple reversing pipes; the multiple second connecting pipes are disposed at the upper and lower ends of the inner wall of the box, and each second connecting pipe connects to multiple second flow channels; the multiple reversing pipes are fixedly installed on the outside of the box and connect two adjacent second connecting pipes; the multiple second connecting pipes and the multiple reversing pipes are used to connect all the second flow channels inside the box in series into multiple continuous second channels according to a preset second conveying path.

8. The welded plate heat exchanger according to claim 1, characterized in that, It also includes a liquid inlet assembly and a liquid outlet assembly; the liquid inlet assembly is used to introduce a first medium into the first flow channel and a second medium into the second flow channel; the liquid outlet assembly is used to collect and discharge the first medium flowing through the first flow channel and to collect and discharge the second medium flowing through the second flow channel.

9. The welded plate heat exchanger according to claim 8, characterized in that, The liquid inlet assembly includes a first liquid inlet pipe, a first distribution pipe, a second liquid inlet pipe, and a second distribution pipe; the first liquid inlet pipe and the first distribution pipe are fixedly connected to the first side wall of the housing and communicate with each other, and the first distribution pipe is used to evenly distribute the first medium entering the first liquid inlet pipe to a plurality of first flow channels; the second liquid inlet pipe and the second distribution pipe are fixedly connected to the upper wall of the housing and communicate with each other, and the second distribution pipe is used to evenly distribute the second medium entering the second liquid inlet pipe to a plurality of second flow channels.

10. The welded plate heat exchanger according to claim 8, characterized in that, The liquid discharge assembly includes a first collection pipe, a first discharge pipe, a second collection pipe, and a second discharge pipe; the first collection pipe and the first discharge pipe are fixedly connected to the second side wall of the housing and communicate with each other; the first collection pipe is used to collect the first medium flowing out from the multiple first channels and guide it to the first discharge pipe. The second collecting pipe and the second discharging pipe are fixedly connected to the upper wall of the box and are interconnected. The second collecting pipe is used to collect the second medium flowing out from the multiple second channels and guide it to the second discharging pipe.

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