Plate heat exchanger

Abstract

The utility model relates to heat exchanger technical field provides a plate heat exchanger, the utility model provides a plate heat exchanger includes a plurality of alternative stacked odd layer sheet and even layer sheet with corrugated structure, in the same sheet, the groove is formed between two adjacent corrugated structures, and the grooves of two adjacent sheets are crossed and set, and the interplate flow channel is formed between the adjacent sheets, the plate heat exchanger still has the first water inlet channel and the first water outlet channel with odd layer interplate flow channel intercommunication, and the second water inlet channel and the second water outlet channel with even layer interplate flow channel intercommunication, the first water inlet channel and the first water outlet channel are set respectively at the opposite two ends of sheet, the second water inlet channel and the first water outlet channel are set at the same end of sheet, and the second water outlet channel and the first water inlet channel are set at the same end of sheet. This plate heat exchanger can carry out the compound flow mode of reverse flow and cross flow, and improve heat exchange efficiency.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger technology, and in particular to a plate heat exchanger. Background Technology

[0002] A plate heat exchanger consists of several metal heat exchange plates with a certain corrugated shape stacked together, allowing hot and cold fluids to alternately pass between the plates to achieve heat exchange. That is, the fluids flowing on both sides of the plates are high-temperature fluid and low-temperature fluid, respectively, and the high-temperature fluid and the low-temperature fluid exchange heat through the metal heat exchange plates.

[0003] The corrugated structure creates a complex three-dimensional flow of fluid between the plates. The protrusions and grooves of the corrugations force the fluid to constantly change direction, creating turbulence and thus ensuring heat exchange efficiency. In traditional plate heat exchangers, the corrugated structures of the upper and lower metal heat exchange plates are usually designed in the same direction, only the flow direction of the fluid is different. The fluid flows in a unidirectional laminar manner along the corrugated grooves, resulting in a large boundary layer thickness that hinders heat transfer. Utility Model Content

[0004] This invention proposes a plate heat exchanger that aims to improve the heat exchange efficiency by changing the relative orientation of the corrugated structure of the upper and lower plates.

[0005] The plate heat exchanger proposed in this utility model includes several alternately stacked odd-numbered and even-numbered corrugated plates. In the same plate, grooves are formed between adjacent corrugated layers, and the grooves of adjacent plates are intersected. Inter-plate flow channels are formed between adjacent plates. The plate heat exchanger also has a first water inlet channel and a first water outlet channel communicating with the inter-plate flow channels of the odd-numbered layers, and a second water inlet channel and a second water outlet channel communicating with the inter-plate flow channels of the even-numbered layers. The first water inlet channel and the first water outlet channel are respectively located at opposite ends of the plate, the second water inlet channel and the first water outlet channel are located at the same end of the plate, and the second water outlet channel and the first water inlet channel are located at the same end of the plate.

[0006] In one embodiment, the corrugated shape of the corrugated structure of the odd-numbered layers is the same as and a mirror image of the corrugated structure of the even-numbered layers.

[0007] In one embodiment, the same plate has at least two corrugated regions arranged side by side, the corrugated structures of the same corrugated region have the same orientation, the corrugated structures of adjacent corrugated regions have different orientations, and the grooves of adjacent corrugated regions are connected.

[0008] In one embodiment, the corrugation shape of the corrugated structure of the odd-numbered layers is different from that of the corrugated structure of the even-numbered layers.

[0009] In one embodiment, the corrugation direction of the corrugated structure of the odd-numbered layers is one of V-shape, W-shape, S-shape, straight line, stepped shape, spiral shape, sine shape, and cosine shape, while the corrugation direction of the corrugated structure of the even-numbered layers is another of V-shape, W-shape, S-shape, straight line, stepped shape, spiral shape, sine shape, and cosine shape.

[0010] In one embodiment, each plate includes a base plate and a surrounding plate integrally connected to the base plate. The base plate and the surrounding plate form a receiving groove. The corrugated structure is formed on the base plate. A flange is provided at the end of the surrounding plate away from the base plate. The flange is disposed opposite to the base plate. The side plate of the upper plate is at least partially disposed in the receiving groove of the lower plate. The flanges of each plate are stacked and positioned, and the recess depth of the receiving groove of the upper plate is less than the recess depth of the receiving groove of the lower plate.

[0011] In one embodiment, the cross-sectional area of ​​the receiving groove gradually decreases from the opening to the bottom.

[0012] In one embodiment, the first water inlet channel and the first water outlet channel are arranged diagonally, and the second water inlet channel and the second water outlet channel are also arranged diagonally.

[0013] In one embodiment, the plate heat exchanger further includes a first inlet pipe and a first outlet pipe, which extend from the top plate to the bottom inter-plate flow channel, respectively. The first inlet pipe forms a first inlet channel, and the first outlet pipe forms a first outlet channel. A first through-hole is provided on the side wall of the first inlet pipe to connect the flow channel of the first inlet pipe and the flow channel between the odd-numbered plate layers. A second through-hole is provided on the side wall of the first outlet pipe to connect the flow channel between the odd-numbered plate layers and the flow channel between the first outlet pipe. The plate heat exchanger further includes a second inlet pipe and a second outlet pipe, which extend from the top plate to the bottom even-numbered plate inter-plate flow channel. The second inlet pipe forms a second inlet channel, and the second outlet pipe forms a second outlet channel. The side wall of the second inlet pipe is provided with a third through-hole to connect the flow channel of the second inlet pipe and the even-numbered plate inter-plate flow channel. The side wall of the second outlet pipe is provided with a fourth through-hole to connect the even-numbered plate inter-plate flow channel and the flow channel of the second outlet pipe.

[0014] In one embodiment, the non-first-layer odd-numbered layer plates and the non-first-layer even-numbered layer plates are respectively provided with diagonally arranged first corner holes and third corner holes, as well as diagonally arranged second corner holes and fourth corner holes. The first corner holes of each plate are arranged opposite each other in the stacking direction to form the first water inlet channel, the third corner holes of each plate are arranged opposite each other in the stacking direction to form the first water outlet channel, the second corner holes of each plate are arranged opposite each other in the stacking direction to form the second water inlet channel, and the fourth corner holes of each plate are arranged opposite each other in the stacking direction to form the second water outlet channel. The non-first-layer odd-numbered layer plates are provided with a first water-blocking ring around the first corner hole. The first water-blocking ring of this layer is inserted into the first corner hole of the next layer plate, and the outer side wall of the first water-blocking ring is fitted with the peripheral side wall of the corresponding first corner hole, thereby isolating the first water inlet channel from the flow channel between the even-numbered layer plates. Each plate has a third water-blocking ring at the first triangular hole, which surrounds the third corner hole. This third water-blocking ring is inserted into the first triangular hole of the next plate, and the outer wall of the third water-blocking ring is fitted to the peripheral wall of the corresponding third corner hole, thereby isolating the flow channel between even-numbered plates from the first water outlet channel. Each non-first even-numbered plate has a second water-blocking ring at the second corner hole, which surrounds the second corner hole. This second water-blocking ring is inserted into the second corner hole of the next plate, and the outer wall of the second water-blocking ring is fitted to the peripheral wall of the corresponding second corner hole, thereby isolating the second water inlet channel from the flow channel between odd-numbered plates. Each non-first even-numbered plate has a fourth water-blocking ring at the fourth corner hole, which surrounds the fourth corner hole. This fourth water-blocking ring is inserted into the fourth corner hole of the next plate, and the outer wall of the fourth water-blocking ring is fitted to the peripheral wall of the corresponding fourth corner hole, thereby isolating the flow channel between odd-numbered plates from the second water outlet channel.

[0015] This utility model plate heat exchanger designs the inlet and outlet directions of the flow channels between odd-numbered plates to be opposite to those between even-numbered plates, enabling convective heat transfer. The grooves of the odd-numbered plates are arranged to intersect with those of the even-numbered plates, allowing the two fluids to flow at an oblique angle, thus achieving a composite flow mode of counter-current and cross-flow. This flow mode can effectively disrupt the fluid boundary layer, reduce thermal resistance, and improve heat transfer efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is an exploded view of an embodiment of the plate heat exchanger provided by this utility model; Figure 2This is a top view of an embodiment of the plate heat exchanger provided by this utility model; Figure 3 yes Figure 2 Cross-sectional view at point AA; Figure 4 yes Figure 2 Cross-sectional view at point BB; Figure 5 This is a partial cross-sectional view of an embodiment of the plate heat exchanger provided by this utility model; Figure 6 This is a schematic diagram of the structure of an odd-numbered plate layer in one embodiment of the plate heat exchanger provided by this utility model; Figure 7 This is a schematic diagram of the structure of an even-numbered plate layer in one embodiment of the plate heat exchanger provided by this utility model.

[0018] Explanation of reference numerals in the attached figures: 1a. Odd-numbered layer plates; 1b. Even-numbered layer plates; 11. Corrugated structure; 12. Base plate; 13. Enclosure plate; 14. Receiving groove; 15. Flange; 16. First corner hole; 17. Second corner hole; 18. Third corner hole; 19. Fourth corner hole; 20. First water-blocking ring; 21. Second water-blocking ring; 22. Third water-blocking ring; 23. Fourth water-blocking ring; 3a. Flow channel between odd-numbered layer plates; 3b. Flow channel between even-numbered layer plates; 4. First water inlet channel; 5. First water outlet channel; 6. Second water inlet channel; 7. Second water outlet channel; 8. First fluid; 9. Second fluid. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0020] It should be noted that the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to direct setup or connection, or indirect setup or connection through centered components or centered structures.

[0021] Furthermore, in embodiments of this utility model, terms such as "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" are used to indicate orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, or in a conventional placement or usage state. These terms are merely for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the structure, feature, device, or element referred to must have a specific orientation or positional relationship, nor that it must be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In the description of this utility model, unless otherwise stated, "multiple" means two or more.

[0022] The various specific technical features and embodiments described in the detailed embodiments can be combined in any suitable manner without contradiction. For example, different implementation methods can be formed by combining different specific technical features / embodiments. In order to avoid unnecessary repetition, the various possible combinations of the various specific technical features / embodiments in this utility model will not be described separately.

[0023] Plate heat exchangers consist of stacked metal heat exchange fins with a specific corrugated shape, allowing hot and cold fluids to alternately pass between the plates for heat exchange. Specifically, the fluids flowing on either side of the plates are a high-temperature fluid and a low-temperature fluid, respectively, and heat exchange occurs between them through the metal heat exchange fins. The corrugated structure creates a complex three-dimensional flow between the plates; the protrusions and grooves of the corrugations force the fluid to constantly change direction, creating turbulence and ensuring heat exchange efficiency. In traditional plate heat exchangers, the corrugated structure of the upper and lower layers of metal heat exchange fins is usually designed in the same direction, only the flow direction of the fluid differs. The fluid flows in a unidirectional laminar flow along the corrugated grooves, resulting in a thick boundary layer that hinders heat transfer.

[0024] like Figures 1 to 4 As shown, the plate heat exchanger provided in this embodiment of the present invention includes several alternately stacked odd-numbered layers of plates 1a and even-numbered layers of plates 1b with corrugated structures 11. In the same plate, grooves are formed between adjacent layers of corrugated structures 11. The grooves of adjacent layers of plates are intersected. The troughs of the upper plate abut against the crests of the lower plate, so that inter-plate channels are formed between adjacent plates. The embodiment of this plate heat exchanger also has a first water inlet channel 4 and a first water outlet channel 5 communicating with the inter-plate channels 3a of the odd-numbered layers, and a second water inlet channel 6 and a second water outlet channel 7 communicating with the inter-plate channels 3b of the even-numbered layers. The first water inlet channel 4 and the first water outlet channel 5 are respectively located at opposite ends of the plate. The second water inlet channel 6 and the first water outlet channel 5 are located at the same end of the plate. The second water outlet channel 7 and the first water inlet channel 4 are located at the same end of the plate.

[0025] Specifically, this embodiment of the plate heat exchanger includes several metal stamping plates, which are stacked and fixed together by welding, screws, or other methods. Odd-numbered plates 1a and even-numbered plates 1b are each formed with several corrugated structures 11 through a stamping process. In the same plate, grooves are formed between adjacent corrugated structures 11, thereby causing the fluid on the plate surface to flow in waves. In traditional plate heat exchangers, the corrugated structures 11 and grooves are usually arranged in the same direction in the stacking direction, meaning that the corrugated structures 11 and grooves of the upper and lower plates are often parallel to each other and do not intersect. In contrast, in this invention, the corrugated structures 11 of odd-numbered plates 1a and even-numbered plates 1b are arranged in an intersecting manner, so the grooves of odd-numbered plates 1a and even-numbered plates 1b are also intersecting. The so-called groove intersection setting means that when the grooves of the odd-numbered layer plate 1a and the grooves of the even-numbered layer plate 1b are moved to the same horizontal space, there is one or more intersection points between the grooves of the odd-numbered layer plate 1a and the grooves of the even-numbered layer plate 1b.

[0026] The plates are stacked and assembled, with the troughs of the upper plates abutting the crests of the lower plates to form inter-plate flow channels between adjacent plates. The plate heat exchanger also has a first inlet channel 4 and a first outlet channel 5 communicating with the odd-numbered inter-plate flow channels 3a, and a second inlet channel 6 and a second outlet channel 7 communicating with the even-numbered inter-plate flow channels 3b. The first inlet channel 4 and the first outlet channel 5 are respectively located at opposite ends of the plates, the second inlet channel 6 and the first outlet channel 5 are located at the same end of the plates, and the second outlet channel 7 and the first inlet channel 4 are located at the same end of the plates. That is, the inlet and outlet directions of the odd-numbered inter-plate flow channels 3a are opposite to the inlet and outlet directions of the even-numbered inter-plate flow channels 3b. For example, when the flow channel 3a between odd-numbered layers is left-in and right-out, the flow channel 3b between even-numbered layers is right-in and left-out; when the flow channel 3a between odd-numbered layers is right-in and left-out, the flow channel 3b between even-numbered layers is left-in and right-out.

[0027] The process is illustrated by introducing a first fluid 8 into the odd-numbered inter-plate channel 3a and a second fluid 9 into the even-numbered inter-plate channel 3b. The first fluid 8 and the second fluid 9 can be liquids or gases. One of the first fluid 8 and the second fluid 9 can be a relatively high-temperature fluid, while the other is a relatively low-temperature fluid. The first fluid 8 and the second fluid 9, with a temperature difference, flow on opposite sides of the plates, thereby exchanging heat. See details... Figure 1 , Figure 3 and Figure 4The first fluid 8 enters the first inlet channel 4 and branches from the first inlet channel 4 into the odd-numbered inter-plate channels 3a. The fluid in the odd-numbered inter-plate channels 3a flows along the grooves of the corresponding plates and then flows out through the first outlet channel 5. The second fluid 9 enters the second inlet channel 6 and branches from the second inlet channel 6 into the even-numbered inter-plate channels 3b. The fluid in the even-numbered inter-plate channels 3b flows along the grooves of the corresponding plates and then flows out through the second outlet channel 7.

[0028] In summary, the plate heat exchanger of this invention designs the inlet and outlet directions of the odd-numbered plate inter-plate channel 3a to be opposite to those of the even-numbered plate inter-plate channel 3b, which enables convective heat transfer. The grooves of the odd-numbered plate 1a and the even-numbered plate 1b are arranged to cross each other, allowing the two fluids to flow obliquely and thus achieving a composite flow mode of counter-current and cross-flow. This flow mode can effectively disrupt the fluid boundary layer, reduce thermal resistance, and improve heat transfer efficiency.

[0029] In some embodiments, to make the grooves of the odd-numbered layer plate 1a intersect with the grooves of the even-numbered layer plate 1b, the corrugated shape of the corrugated structure 11 of the odd-numbered layer plate 1a can be the same as and a mirror image of the corrugated structure 11 of the even-numbered layer plate 1b. For example, the corrugated shape of the corrugated structure 11 of the odd-numbered layer plate 1a and the corrugated structure 11 of the even-numbered layer plate 1b are both V-shaped, but the orientation of the corrugated structure 11 of the odd-numbered layer plate 1a is opposite to that of the corrugated structure 11 of the even-numbered layer plate 1b. Figure 1 As shown. Based on this, the corrugated structure 11 of the odd-numbered layer plate 1a and the corrugated structure 11 of the even-numbered layer plate 1b naturally intersect, realizing a composite flow mode of reverse flow and cross flow. At this time, the stamping die of the odd-numbered layer plate 1a and the stamping die of the even-numbered layer plate 1b can be the same, without the need to change or design another set of dies, saving production costs. Of course, the corrugated shape of the corrugated structure 11 of the odd-numbered layer plate 1a and the corrugated structure 11 of the even-numbered layer plate 1b can also be a mirror image of a W-shape, S-shape, or straight line, etc.

[0030] In practical applications, the same plate can have at least two corrugated regions arranged side by side. The corrugated structures 11 in the same corrugated region have the same orientation, while the corrugated structures 11 in adjacent corrugated regions have different orientations, and the grooves in adjacent corrugated regions are connected. In this case, the same plate is divided into several corrugated regions, and the corrugation orientations of different corrugated regions are different, thereby forcing the fluid to undergo at least one turn on the same plate, forming vortices, which helps to weaken the boundary layer of the fluid and reduce thermal resistance.

[0031] When the corrugated structure 11 is V-shaped, the same plate has a first corrugated region and a second corrugated region arranged side by side. The corrugated structures 11 in the first and second corrugated regions are respectively straight-lined, and the corrugated structures 11 in the first and second corrugated regions are set at an acute angle. When the corrugated structure 11 is W-shaped, the same plate has four corrugated regions arranged side by side. The corrugated structures 11 in the four corrugated regions are respectively straight-lined, and the included angle between the corrugated structures 11 in adjacent corrugated regions is an acute angle. The included angle between the corrugated structures 11 in adjacent corrugated regions is defined as α, where 30°≤α≤60°. If the included angle between the corrugated structures 11 in adjacent corrugated regions is too large, the corrugated structures 11 in the two corrugated regions will fold significantly, hindering fluid flow. If the included angle between the corrugated structures 11 in adjacent corrugated regions is too large, the fluid cannot form an effective vortex. 30° to 60° is a more suitable angle range.

[0032] In practical applications, the direction of the corrugated structure 11 in each corrugated region is not limited to a straight line. It can also be “S”, stepped, spiral, sine, cosine, etc. There are no restrictions here, as long as these corrugated shapes can cause the fluid to change direction and form vortex disturbances.

[0033] In some embodiments, to allow the grooves of the odd-numbered layer plate 1a to intersect with the grooves of the even-numbered layer plate 1b, the corrugation shape of the corrugated structure 11 of the odd-numbered layer plate 1a can be different from that of the corrugated structure 11 of the even-numbered layer plate 1b. For example, the corrugation direction of the corrugated structure 11 of the odd-numbered layer plate 1a can be one of V-shape, W-shape, S-shape, straight line, stepped shape, spiral shape, sine shape, and cosine shape, while the corrugation direction of the corrugated structure 11 of the even-numbered layer plate 1b can be another of V-shape, W-shape, S-shape, straight line, stepped shape, spiral shape, sine shape, and cosine shape. The corrugated structure 11 of the odd-numbered layer plate 1a has a different corrugated shape than the corrugated structure 11 of the even-numbered layer plate 1b. This naturally allows the corrugated structure 11 of the odd-numbered layer plate 1a to intersect with the corrugated structure 11 of the even-numbered layer plate 1b, thus achieving a composite flow mode of reverse flow and cross flow.

[0034] Reference Figure 3 , Figure 5 , Figure 6 and Figure 7In this embodiment of the plate heat exchanger, each plate may include a base plate 12 and a surrounding plate 13 that is integrally connected to the base plate 12 and is disposed around the base plate 12. The base plate 12 and the surrounding plate 13 form a receiving groove 14. A corrugated structure 11 is formed on the base plate 12. A flange 15 is provided at the end of the surrounding plate 13 away from the base plate 12. The flange 15 is disposed opposite to the base plate 12. The side plate of the upper plate is at least partially disposed in the receiving groove 14 of the lower plate. The flanges 15 of each plate are stacked and limited, and the recess depth of the receiving groove 14 of the upper plate is less than the recess depth of the receiving groove 14 of the lower plate.

[0035] Specifically, each plate is bowl-shaped overall, and the base plate 12, surrounding plate 13, and flange 15 can be integrally formed by stamping. The base plate 12 and surrounding plate 13 form a receiving groove 14 for accommodating the upper layer plate. The lower layer plate can serve as a nestable shell for the upper layer plate, and the plates can be automatically aligned without precise positioning on all four sides when stacked. When the plates are nested to their limit, the flanges 15 of each plate are pressed tightly together, thus limiting the position of each plate. As a result, the clamping force between the plates no longer acts directly on the crests of the corrugated structure 11, but moves to the flange 15, preventing the corrugations from collapsing under pressure.

[0036] The cross-sectional area of ​​the receiving groove 14 gradually decreases from the opening to the bottom. That is, the receiving groove 14 is conical, with the largest opening at the opening and the smallest opening at the bottom. Of course, the surrounding plate 13 should not be excessively tilted; an angle between 1° and 3° is preferable. The conical groove provides a progressive guide, automatically correcting the coaxiality when the upper plate is inserted into the receiving groove 14 of the lower plate, without the need for positioning rods or manual fine-tuning.

[0037] Reference Figure 5 The crests of the corrugated structure 11 of each plate layer are flush with the top surface of the base plate 12. The vertical distance between the bottom surface of the base plate 12 of the upper plate layer and the top surface of the base plate 12 of the lower plate layer is defined as L, and the settlement distance of the trough of the corrugated structure 11 of the upper plate layer is defined as d, where 0 ≤ Ld ≤ 3 mm. In other words, the vertical distance between the base plates 12 of the upper and lower plates can be exactly equal to the settlement distance of the trough of the corrugated structure 11 of the upper plate layer. In this case, when two adjacent plates are installed, the trough of the upper plate layer just meets the crest of the lower plate layer, forming a lattice support, improving the overall structural strength of the plate heat exchanger, and thus reducing its overall thickness, which is beneficial for the ultra-thin design of the plate heat exchanger. Alternatively, the vertical distance L between the bottom plate 12 of the upper layer plate and the bottom plate 12 of the lower layer plate can be slightly greater than the settlement distance of the trough of the corrugated structure 11 of the upper layer plate. In this case, when the two adjacent layers of plates are installed in place, there is a gap between the trough of the upper layer plate and the crest of the lower layer plate.

[0038] Reference Figure 1 The first inlet channel 4 and the first outlet channel 5 can be diagonally arranged, as can the second inlet channel 6 and the second outlet channel 7. Specifically, the bottom plate 12 of the plate is square. The first inlet channel 4 and the first outlet channel 5 are connected to the flow channel 3a between odd-numbered layers, and the second inlet channel 6 and the second outlet channel 7 are connected to the flow channel 3b between even-numbered layers. The first inlet channel 4 and the first outlet channel 5 are located at opposite ends of the same diagonal, and the second inlet channel 6 and the second outlet channel 7 are located at opposite ends of another diagonal. In this embodiment, the diagonal arrangement of the first inlet channel 4 and the first outlet channel 5, and the diagonal arrangement of the second inlet channel 6 and the second outlet channel 7, can extend the heat exchange path of the first fluid 8 and the second fluid 9, enabling sufficient heat exchange between the two fluids. On the other hand, the streamlines of the first fluid 8 and the second fluid 9 project onto the plate surface in an "X" shape, and the first fluid 8 and the second fluid 9 exhibit a composite flow pattern of counter-current and cross-flow at any position, further improving the heat exchange efficiency.

[0039] To isolate the inlet and outlet water flow paths of the odd-numbered inter-plate flow channel 3a from those of the even-numbered inter-plate flow channel 3b, this embodiment of the plate heat exchanger may further include a first inlet pipe and a first outlet pipe. The first inlet pipe and the first outlet pipe extend from the top plate to the bottom inter-plate flow channel, respectively. The first inlet pipe forms a first inlet channel 4, and the first outlet pipe forms a first outlet channel 5. The side wall of the first inlet pipe is provided with a first through-hole to connect the flow channel of the first inlet pipe and the odd-numbered inter-plate flow channel 3a. The side wall of the first outlet pipe is provided with a second through-hole to connect the flow channel of the odd-numbered inter-plate flow channel 3a and the flow channel of the first outlet pipe. Similarly, the plate heat exchanger also includes a second inlet pipe and a second outlet pipe. The second inlet pipe and the second outlet pipe extend from the top plate to the even-numbered inter-plate flow channel 3b at the bottom. The second inlet pipe forms a second inlet channel 6, and the second outlet pipe forms a second outlet channel 7. The side wall of the second inlet pipe is provided with a third through-hole to connect the flow channel of the second inlet pipe and the even-numbered inter-plate flow channel 3b. The side wall of the second outlet pipe is provided with a fourth through-hole to connect the even-numbered inter-plate flow channel 3b and the flow channel of the second outlet pipe.

[0040] Specifically, the bottom plate 12 of the corresponding plate is provided with corner holes for the water inlet pipe and the water outlet pipe to pass through. The first water inlet pipe and the first water outlet pipe extend from the top plate through the corresponding corner holes in a direction perpendicular to the bottom plate 12 to the bottom inter-plate flow channel, that is, the first inter-plate flow channel from bottom to top, and the first water inlet pipe and the second water inlet pipe are diagonally arranged. The first water inlet pipe forms a first water inlet channel 4, and the first water outlet pipe forms a first water outlet channel 5. The side wall of the first water inlet pipe is provided with a plurality of first water outlets, the number of which is the same as the number of odd-numbered inter-plate flow channels 3a, and one first water outlet is connected to one odd-numbered inter-plate flow channel 3a; the side wall of the first water outlet pipe is provided with a plurality of second water outlets, the number of which is the same as the number of odd-numbered inter-plate flow channels 3a, and one second water outlet is connected to one odd-numbered inter-plate flow channel 3a. Similarly, the second inlet pipe and the second outlet pipe extend from the top plate through the corresponding corner holes in a direction perpendicular to the bottom plate 12 to the even-numbered inter-plate flow channel 3b at the bottom, i.e., the second inter-plate flow channel from bottom to top, and the second inlet pipe and the second outlet pipe are diagonally arranged. The second inlet pipe forms a second inlet channel 6, and the second outlet pipe forms a second outlet channel 7. The side wall of the second inlet pipe is provided with several third water inlets, the number of which is the same as the number of even-numbered inter-plate flow channels 3b, and one third water inlet is connected to one even-numbered inter-plate flow channel 3b; the side wall of the second outlet pipe is provided with several fourth water inlets, the number of which is the same as the number of even-numbered inter-plate flow channels 3b, and one fourth water inlet is connected to one even-numbered inter-plate flow channel 3b.

[0041] At this time, the flow paths of the first fluid 8 and the second fluid 9 are as follows: the first fluid 8 enters the first inlet pipe, and then flows into the corresponding odd-numbered inter-plate channel 3a through the first outlet. The first fluid 8 in the odd-numbered inter-plate channel 3a flows obliquely along the corrugated structure 11 of the corresponding plate. When it reaches the second outlet, it flows through the second outlet into the first outlet pipe. The first fluid 8 in each odd-numbered inter-plate channel 3a is discharged from the first outlet pipe. The second fluid 9 enters the second inlet pipe, and then flows into the corresponding even-numbered inter-plate channel 3b through the third outlet. The second fluid 9 in the even-numbered inter-plate channel 3b flows obliquely along the corrugated structure 11 of the corresponding plate. When it reaches the fourth outlet, it flows through the fourth outlet into the second outlet pipe. The second fluid 9 in each even-numbered inter-plate channel 3b is discharged from the second outlet pipe.

[0042] Alternatively, the first water inlet channel 4, the first water outlet channel 5, the second water inlet channel 6, and the second water outlet channel 7 can be formed by the structure of each layer of plates. (Refer to...) Figure 1 , Figure 3 , Figure 4 , 6 and Figure 7The non-first-layer odd-numbered layer plates 1a and the non-first-layer even-numbered layer plates 1b are respectively provided with diagonally arranged first corner holes 16 and third corner holes 18, as well as diagonally arranged second corner holes 17 and fourth corner holes 19. The first corner holes 16 of each plate are arranged opposite each other in the stacking direction to form a first water inlet channel 4. The third corner holes 18 of each plate are arranged opposite each other in the stacking direction to form a first water outlet channel 5. The second corner holes 17 of each plate are arranged opposite each other in the stacking direction to form a second water inlet channel 6. The fourth corner holes 19 of each plate are arranged opposite each other in the stacking direction to form a second water outlet channel 7.

[0043] To prevent the even-numbered layer inter-plate channel 3b from connecting with the first water inlet channel 4 and the first water outlet channel 5, the odd-numbered layer plates 1a (excluding the first layer) are provided with a first water-blocking ring 20 surrounding the first corner hole 16. The first water-blocking ring 20 of this layer is inserted into the first corner hole 16 of the next layer plate, and the outer side wall of the first water-blocking ring 20 is fitted with the peripheral side wall of the corresponding first corner hole 16, thereby isolating the first water inlet channel 4 from the even-numbered layer inter-plate channel 3b. Similarly, the odd-numbered layer plates 1a (excluding the first layer) are provided with a third water-blocking ring 22 surrounding the third corner hole 18 at the third triangular hole 18. The third water-blocking ring 22 of this layer is inserted into the third triangular hole 18 of the next layer plate, and the outer side wall of the third water-blocking ring 22 is fitted with the peripheral side wall of the corresponding third corner hole 18, thereby isolating the even-numbered layer inter-plate channel 3b from the first water outlet channel 5.

[0044] To prevent the flow channel 3a between odd-numbered layers from connecting with the second inlet channel 6 and the second outlet channel 7, the even-numbered layer plates 1b (not the first layer) are provided with a second water-blocking ring 21 surrounding the second corner hole 17. The second water-blocking ring 21 of this layer is inserted into the second corner hole 17 of the next layer plate, and the outer wall of the second water-blocking ring 21 is fitted with the peripheral wall of the corresponding second corner hole 17, thereby isolating the second inlet channel 6 from the flow channel 3a between odd-numbered layers. Similarly, the even-numbered layer plates 1b (not the first layer) are provided with a fourth water-blocking ring 23 surrounding the fourth corner hole 19. The fourth water-blocking ring 23 of this layer is inserted into the fourth corner hole 19 of the next layer plate, and the outer wall of the fourth water-blocking ring 23 is fitted with the peripheral wall of the corresponding fourth corner hole 19, thereby isolating the flow channel 3a between odd-numbered layers from the second outlet channel 7.

[0045] Understandably, the odd-numbered first-layer plate 1a, i.e., the first plate from bottom to top, does not require water flow and therefore does not need corner holes. The even-numbered first-layer plate 1b, i.e., the second plate from bottom to top, only needs to supply the first fluid 8 into the bottommost inter-plate channel and supply the fluid out of the bottommost inter-plate channel, so only a set of diagonally arranged corner holes can be provided.

[0046] When the first fluid 8 enters the first inlet channel 4, due to the isolation effect of the first baffle ring 20, the first fluid 8 will only flow into the odd-numbered inter-plate channel 3a and not into the even-numbered inter-plate channel 3b. When the first fluid 8 flows out from the first outlet channel 5, due to the isolation effect of the third baffle ring 22, the first fluid 8 after heat exchange will not flow into the even-numbered inter-plate channel 3b. When the second fluid 9 enters the second inlet channel 6, due to the isolation effect of the second baffle ring 21, the second fluid 9 will only flow into the even-numbered inter-plate channel 3b and not into the odd-numbered inter-plate channel 3a. When the second fluid 9 flows out from the second outlet channel 7, due to the isolation effect of the fourth baffle ring 23, the second fluid 9 after heat exchange will not flow into the odd-numbered inter-plate channel 3a. In summary, the arrangement of the first baffle ring 20, the second baffle ring 21, the third baffle ring 22, and the fourth baffle ring 23 can effectively isolate the two fluids, ensuring that the two fluids flow along the preset path.

[0047] In this embodiment, the first water inlet channel 4, the first water outlet channel 5, the second water inlet channel 6, and the second water outlet channel 7 are formed by stacking plates, which can save the cumbersome steps of connecting four through pipes and welding the external pipes.

[0048] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A plate heat exchanger, characterized in that, It includes several alternately stacked odd-numbered and even-numbered corrugated plates. In the same plate, grooves are formed between adjacent corrugated structures. The grooves of adjacent plates are intersected. Inter-plate flow channels are formed between adjacent plates. The plate heat exchanger also has a first inlet channel and a first outlet channel communicating with the flow channels between odd-numbered plates, and a second inlet channel and a second outlet channel communicating with the flow channels between even-numbered plates. The first inlet channel and the first outlet channel are respectively located at opposite ends of the plate, the second inlet channel and the first outlet channel are located at the same end of the plate, and the second outlet channel and the first inlet channel are located at the same end of the plate.

2. The plate heat exchanger as described in claim 1, characterized in that, The corrugated shape of the corrugated structure of the odd-numbered layers is the same as that of the corrugated structure of the even-numbered layers and is a mirror image of each other.

3. The plate heat exchanger as described in claim 2, characterized in that, The same plate has at least two corrugated areas arranged side by side. The corrugated structures in the same corrugated area have the same direction, while the corrugated structures in adjacent corrugated areas have different directions, and the grooves in adjacent corrugated areas are connected.

4. The plate heat exchanger as described in claim 1, characterized in that, The corrugated shape of an odd-numbered layer plate is different from that of an even-numbered layer plate.

5. The plate heat exchanger as described in claim 4, characterized in that, The corrugated structure of odd-numbered layers has a corrugated direction that is one of the following: V-shaped, W-shaped, S-shaped, straight, stepped, spiral, sine, or cosine. The corrugated structure of even-numbered layers has a corrugated direction that is another of the following: V-shaped, W-shaped, S-shaped, straight, stepped, spiral, sine, or cosine.

6. The plate heat exchanger as described in any one of claims 1 to 5, characterized in that, Each plate includes a base plate and a surrounding plate that is integrally connected to the base plate. The base plate and the surrounding plate together form a receiving groove. The corrugated structure is formed on the base plate. A flange is provided at the end of the surrounding plate away from the base plate. The flange is disposed opposite to the base plate. The side plate of the upper plate is at least partially disposed in the receiving groove of the lower plate. The flanges of each plate are stacked and limited, and the recess depth of the receiving groove of the upper plate is less than the recess depth of the receiving groove of the lower plate.

7. The plate heat exchanger as described in claim 6, characterized in that, The cross-sectional area of ​​the receiving groove gradually decreases from the opening to the bottom.

8. The plate heat exchanger as described in any one of claims 1 to 5, characterized in that, The first water inlet channel and the first water outlet channel are arranged diagonally, and the second water inlet channel and the second water outlet channel are arranged diagonally.

9. The plate heat exchanger as described in claim 8, characterized in that, The plate heat exchanger further includes a first inlet pipe and a first outlet pipe, which extend from the top plate to the bottom plate inter-plate flow channel. The first inlet pipe forms the first inlet channel, and the first outlet pipe forms the first outlet channel. The side wall of the first inlet pipe is provided with a first water outlet to connect the flow channel of the first inlet pipe and the flow channel between the odd-numbered plates. The side wall of the first outlet pipe is provided with a second water outlet to connect the flow channel between the odd-numbered plates and the flow channel of the first outlet pipe. The plate heat exchanger further includes a second inlet pipe and a second outlet pipe. The second inlet pipe and the second outlet pipe extend from the top plate to the bottom even-numbered plate inter-plate flow channel, respectively. The second inlet pipe forms a second inlet channel, and the second outlet pipe forms a second outlet channel. The side wall of the second inlet pipe is provided with a third through-hole to connect the flow channel of the second inlet pipe and the even-numbered plate inter-plate flow channel. The side wall of the second outlet pipe is provided with a fourth through-hole to connect the even-numbered plate inter-plate flow channel and the flow channel of the second outlet pipe.

10. The plate heat exchanger as described in claim 8, characterized in that, The non-first layer odd-numbered layer plates and the non-first layer even-numbered layer plates are respectively provided with diagonally arranged first corner holes and third corner holes, as well as diagonally arranged second corner holes and fourth corner holes. The first corner holes of each plate are arranged opposite each other in the stacking direction to form the first water inlet channel, the third corner holes of each plate are arranged opposite each other in the stacking direction to form the first water outlet channel, the second corner holes of each plate are arranged opposite each other in the stacking direction to form the second water inlet channel, and the fourth corner holes of each plate are arranged opposite each other in the stacking direction to form the second water outlet channel. The odd-numbered layers that are not the first layer have a first water-blocking ring around the first corner hole. The first water-blocking ring of this layer is inserted into the first corner hole of the next layer, and the outer wall of the first water-blocking ring is fitted with the peripheral wall of the corresponding first corner hole, thereby isolating the first water inlet channel from the flow channel between even-numbered layers. The odd-numbered layers that are not the first layer have a third water-blocking ring around the third corner hole at the third triangular hole. The third water-blocking ring of this layer is inserted into the third triangular hole of the next layer, and the outer wall of the third water-blocking ring is fitted with the peripheral wall of the corresponding third corner hole, thereby isolating the flow channel between even-numbered layers from the first water outlet channel. The even-numbered layers of non-first-layer plates are provided with a second water-blocking ring around the second corner hole. The second water-blocking ring of this layer is inserted into the second corner hole of the next layer plate, and the outer wall of the second water-blocking ring is fitted with the peripheral wall of the corresponding second corner hole, thereby isolating the second water inlet channel from the flow channel between odd-numbered layers. The even-numbered layers of non-first-layer plates are provided with a fourth water-blocking ring around the fourth corner hole. The fourth water-blocking ring of this layer is inserted into the fourth corner hole of the next layer plate, and the outer wall of the fourth water-blocking ring is fitted with the peripheral wall of the corresponding fourth corner hole, thereby isolating the flow channel between odd-numbered layers from the second water outlet channel.

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