heat exchanger

Abstract

The heat exchanger of the present invention includes flattened tubes and a plurality of plates, the plurality of plates arranged to be stacked, flattened tubes provided between at least one pair of adjacent plates, the flattened tubes having several through holes, and a first inter-plate passage between at least another pair of adjacent plates, the heat exchanger includes a first flow path and a second flow path that are not in communication, the fluid in the first flow path and the fluid in the second flow path are heat exchangeable, and the structure of the heat exchanger can be simplified by arranging the flattened tubes and plates in this manner.

Description

Technical Field

[0001] This application claims the priority of a Chinese patent application filed with the China Patent Office on June 9, 2023, with an application number of 202310684625.3 and an invention title of "Heat Exchanger", and all of its contents are incorporated herein by reference.

[0002] The present invention relates to the technical field of heat exchange, and specifically, to a heat exchanger.

Background Art

[0003] The heat exchanger includes a housing and a core. The core includes a first manifold, a second manifold, fin plates, and flat tubes. Between the first manifold and the second manifold, several horizontally arranged flat tubes are uniformly arranged. Between adjacent flat tubes, fins distributed in an array in the vertical direction are inserted. Refrigerant flow paths are provided in the flat tubes and the manifolds, and the fin plates have coolant flow paths. The core is provided in the accommodation chamber of the housing to realize the exchange of thermal energy between the refrigerant and the coolant. The core is mounted in the accommodation chamber of the housing. In this way, the overall structure of the heat exchanger is complex.

Summary of the Invention

Problems to be Solved by the Invention

[0004] The object of the present invention is to provide a heat exchanger with a simple structure.

Means for Solving the Problems

[0005] To achieve the above objective, the present invention provides a heat exchanger comprising a flattened tube and a plurality of plates, wherein the plurality of plates are arranged to be stacked, and the flattened tube is provided between at least one pair of adjacent plates along the stacking direction of the plates, the flattened tube has several through holes, and there is a first inter-plate passage between at least another pair of adjacent plates, the heat exchanger comprises a first flow path and a second flow path that are not in communication, the fluid in the first flow path and the fluid in the second flow path are heat exchangeable, the through holes in the flattened tube are part of the first flow path, and the first inter-plate passage is part of the second flow path.

[0006] The heat exchanger of the present invention includes flattened tubes and a plurality of plates, the plurality of plates being arranged in a stacked manner, flattened tubes provided between at least one pair of adjacent plates, the flattened tubes having several through holes, and a first inter-plate passage between at least another pair of adjacent plates, the heat exchanger including a first non-communicating flow path and a second flow path, the fluid in the first flow path and the fluid in the second flow path being heat exchangeable, and the structure of the heat exchanger can be simplified by arranging the flattened tubes and plates in this manner. [Brief explanation of the drawing]

[0007] [Figure 1] A stereoscopic view of heat exchange unit A of a heat exchanger, which is a first embodiment of the present invention, from one viewing angle. [Figure 2] An exploded view of the heat exchange unit A of a heat exchanger, which is a first embodiment of the present invention. [Figure 3] A structural diagram of heat exchange unit A of a heat exchanger, which is a first embodiment of the present invention, from one viewing angle. [Figure 4] A cross-sectional view of heat exchange unit A along AA in Figure 3. [Figure 5] A cross-sectional view of heat exchange unit A in Figure 3, along BB. [Figure 6] A stereoscopic view of the third plate from one viewing angle in Figure 1. [Figure 7]A stereoscopic view of the third plate from a different viewing angle in Figure 1. [Figure 8] A stereoscopic view of the second plate in Figure 1 from one viewing angle. [Figure 9] A stereoscopic view of the second plate from a different viewing angle in Figure 1. [Figure 10] A stereoscopic view of the combined structure of the flattened tube and the third plate from one viewing angle. [Figure 11] Stereoscopic view from one viewing angle of a combined structure of a flattened tube and a third plate in another embodiment. [Figure 12] Stereoscopic view from one viewing angle of a combined structure of a flattened tube and a third plate in another embodiment. [Figure 13] An exploded view of heat exchange unit A of a heat exchanger, which is a second embodiment of the present invention. [Figure 14] A stereoscopic view of the first plate from one viewing angle in Figure 13. [Figure 15] A stereoscopic view of the first plate from a different viewing angle in Figure 13. [Figure 16] A stereoscopic view of the second plate from one viewing angle in Figure 13. [Figure 17] A stereoscopic view of the second plate from a different viewing angle in Figure 13. [Modes for carrying out the invention]

[0008] The present invention will be further described below with reference to the drawings and specific embodiments.

[0009] As shown in Figures 1 to 10, a partial structure of the heat exchanger of the first embodiment is shown, and the heat exchanger includes a plurality of plates 101 arranged in a stacked manner, with space between adjacent plates 10 for fluid to flow. The heat exchanger includes flattened tubes 4, and along the stacking direction of the plates 101, flattened tubes 4 are provided between at least one pair of adjacent plates 101, and these flattened tubes 4 have several through holes 41, and there is a first inter-plate passage S between at least another pair of adjacent plates 101. The heat exchanger includes a first channel and a second channel that are not connected, and the fluid in the first channel and the fluid in the second channel are capable of heat exchange. The through-hole 41 of the flattened tube 4 is part of the first channel, and the first inter-plate passage S is part of the second channel. In this embodiment, a flattened pipe 4 is located between plate 101 and an adjacent plate 101, and a first inter-plate passage S is located between plate 101 and another adjacent plate 101. The first inter-plate passage S and the flattened pipe 4 are arranged alternately, the first inter-plate passage S allows a first fluid to flow, the through-hole 41 allows a second fluid to flow, and the through-hole 41 does not communicate with the first inter-plate passage S. By connecting the flattened tube 4 and the plate 101, the structure of the heat exchanger can be simplified, the pressure resistance of the flattened tube 4 is increased, and the structural strength of the heat exchanger can be improved.

[0010] In this embodiment, the plate 101 includes a body 1015 and a flange 1011, the flange 1011 being arranged along the circumferential direction of the body 1015 and projecting upward relative to the body 1015. After assembling multiple plates 101, flat tubes 4, and other components, a core is formed, and the entire core is placed in a brazing furnace for brazing. The other components include, for example, a top plate, a bottom plate, and a mounting plate. The flanges 1011 of adjacent plates 101 are welded together and sealed. In this embodiment, the upper and lower surfaces of the flattened tube 4 are welded to adjacent plates 101, respectively, and the heat exchanger is sealed by welding. A heat exchanger with such a structure has high heat exchange efficiency, does not require a separate housing to accommodate the core, has a simple structure, and the entire structure is fixed by brazing, making the heat exchanger forming process simple. The first fluid of the present invention is a coolant, which is mainly brine, for example, cooling water or cooling oil, and the second fluid of the present invention is a refrigerant, which is mainly a coolant, for example, a fluorinated hydrocarbon coolant or carbon dioxide.

[0011] Furthermore, a flat tube 4 is provided between the plate 101 and an adjacent plate in other embodiments, and a flat tube 4 is also provided between the plate 101 and another adjacent plate 101. Only between the lower-layer plates 101, a first plate-to-plate passage S is provided, and a refrigerant flows through the through-hole 41 of the flat tube 4. That is, the refrigerant plate-to-plate passages of two layers are arranged continuously. For example, a flat tube 4 is provided between the first plate and the second plate, a flat tube 4 is also provided between the second plate and the third plate, and there is a first plate-to-plate passage S between the third plate and the fourth plate. In this way, heat exchange can also be performed between the coolant and the refrigerant, but the heat exchange efficiency between the coolant and the refrigerant is low, and the heat exchange performance of the heat exchanger is relatively poor. Here, the first plate, the second plate, the third plate, and the fourth plate do not represent the order of the plates of the heat exchanger, but simply indicate four adjacent plates. In other embodiments, after arranging the first plate-to-plate passages of two layers or multiple layers continuously, the flat tube 4 may be arranged. A flat tube 4 is provided between a set of adjacent plates 101 in other embodiments, and a first plate-to-plate passage S is provided between any other adjacent plates 101. For ease of description, the up and down directions are defined as the up and down directions in Drawing 1 of the specification. Up and down simply indicate relative positions. The height direction, length direction, and width direction of the heat exchanger are defined as the height direction, length direction, and width direction in Drawing 1 of the specification. In the present invention, the height direction of the heat exchanger coincides with the stacking direction of the plates. The length direction of the flat tube in the present invention substantially coincides with the length direction of the heat exchanger. "Substantially coincides" includes coinciding and being approximately coinciding. In the present invention, the length direction of the plate coincides with the length direction of the heat exchanger, and the width direction of the plate coincides with the width direction of the heat exchanger. The front and back directions are defined as the front and back directions in Drawing 1 of the specification. Front and back simply indicate relative positions.

[0012] As shown in FIGS. 6 to 10, in the present embodiment, along the length direction of the heat exchanger, the plate 101 includes a first end 1013 and a second end 1014. Furthermore, the main body 1015 of the plate 101 includes a first corner hole region 6 and a second corner hole region 7. The first corner hole region 6 is close to the first end 1013, the second corner hole region 7 is close to the second end 1014, and the heat exchange region 1012 is located between the first corner hole region 6 and the second corner hole region 7. In this embodiment, the first corner hole region 6 is located between the heat exchange region 1012 and the flange 1011 close to the first end 1013, and the second corner hole region 7 is located between the heat exchange region 1012 and the flange 1011 close to the second end 1014. The first corner hole region 6 includes a first corner hole 61 and a second corner hole 62, and the second corner hole region 7 includes a third corner hole 71 and a fourth corner hole 72. Along the width direction of the heat exchanger, the first corner hole 61 and the third corner hole 71 are located on the same side of the plate 101, the second corner hole 62 and the fourth corner hole 72 are located on the other side of the plate 101, the first corner hole 61 and the fourth corner hole 72 are arranged diagonally, and the second corner hole 62 and the third corner hole 71 are arranged diagonally.

[0013] As shown in FIGS. 1 to 2, the heat exchanger includes four passages, namely a first passage 104, a second passage 105, a third passage 106, and a fourth passage 107. The first corner holes 61 of the plurality of plates 101 form the first passage 104 so as to be at least partially aligned along the stacking direction of the plates 101. The second corner holes 62 of the plurality of plates 101 form the second passage 105 so as to be at least partially aligned along the stacking direction of the plates 101. The third corner holes 71 of the plurality of plates 101 form the third passage 106 so as to be at least partially aligned along the stacking direction of the plates 101. The fourth corner holes 72 of the plurality of plates 101 form the fourth passage 107 so as to be at least partially aligned along the stacking direction of the plates 101. Along the width direction of the heat exchanger, the first passage 104 and the third passage 106 are located on the same side of the heat exchanger, the second passage 105 and the fourth passage 107 are located on the other side of the heat exchanger, the first passage 104 and the fourth passage 107 are arranged diagonally, and the second passage 105 and the third passage 106 are arranged diagonally.

[0014] In this embodiment, the first passage 104 and the fourth passage 107 are used for the inflow and outflow of the refrigerant to and from the heat exchanger, respectively, while the second passage 105 and the third passage 106 are used for the inflow and outflow of the coolant to and from the heat exchanger, respectively. After assembling the plate 101 and the flattened pipe 4, the entire assembly is brazed, and the square hole regions of adjacent plates 101 are welded together. In this embodiment, plate 101 and adjacent plate 101 are spot-welded around the outer circumference of these first corner holes 61, and there is a first hole passage 63 between plate 101 and the adjacent plate 101, adjacent to the outer circumference of the first corner holes 61 along a direction perpendicular to the stacking direction of plate 101, while plate 101 and another adjacent plate 101 are welded all around the outer circumference of these first corner holes 61, and there is no first hole passage 63 communicating with the first inter-plate passage S between plate 101 and the other adjacent plate 101, adjacent to the outer circumference of the first corner holes 61 along a direction perpendicular to the stacking direction of plate 101. Thus, the first passage 104 communicates with the through-hole 41 via the first hole 63, but does not communicate with the first inter-plate passage S. Similarly, in this welding configuration, a fourth passage 74 is located between plate 101 and one adjacent plate 101, close to the outer circumference of the fourth corner hole 72, and the fourth passage 107 communicates with the through hole 41 via the fourth passage 74. The area between plate 101 and another adjacent plate 101 is welded all around, close to the outer circumference of the fourth corner hole 72, and the fourth passage 107 does not communicate with the first inter-plate passage S. The area between plate 101 and one adjacent plate 101, close to the outer circumference of the second corner hole 62, is a second passage There is a 64, and the plate 101 is welded all around the circumference between it and another adjacent plate 101, and the second passage 105 communicates with the first inter-plate passage S via the second passage 64 and does not communicate with the through hole 41, and close to the outer circumference of the third corner hole 71, there is a third passage 73 between the plate 101 and one adjacent plate 101, and the plate 101 is welded all around the circumference between it and another adjacent plate 101, and the third passage 106 communicates with the first inter-plate passage S via the third passage 73 and does not communicate with the through hole 41.

[0015] In this embodiment, the first passage 104 is a refrigerant inlet passage, the fourth passage 107 is a refrigerant outlet passage, the second passage 105 is a coolant inlet passage, and the third passage 106 is a coolant outlet passage. The first passage 104 and the fourth passage 107 are arranged diagonally, and the second passage 105 and the third passage 106 are also arranged diagonally. This allows for a longer flow path for the refrigerant and coolant, thereby improving the heat exchange efficiency of the heat exchanger. The refrigerant flows into the first passage 104 from its inlet, then flows through the first hole 63 into the through-hole 41 of the flat tube 4, and then flows into the fourth passage 107 through the fourth hole 74, and finally flows out of the heat exchanger from the fourth passage 107. The first passage 104, the fourth passage 107, the first hole 63, the through hole 41 of the flattened pipe 4, and the fourth hole 74 are all part of the first flow path. The coolant flows into the second passage 105 from its inlet, then into the first inter-plate passage S via the second hole 64, and then into the third passage 106 via the third hole 73, and finally out of the heat exchanger from the third passage 106. The second passage 105, the third passage 106, the third hole 73, the first interplate passage S, and the second hole 64 are part of the second flow channel. The inlets and outlets of the first passage 104, the second passage 105, the third passage 106, and the fourth passage 107 may be flexibly selected to be located above or below the heat exchanger, depending on the needs. In other embodiments, the first passage 104 may be a refrigerant inlet passage, the third passage 106 may be a refrigerant outlet passage, the second passage 105 may be a coolant inlet passage, and the fourth passage 107 may be a coolant outlet passage. Furthermore, the third passage 106 may be a coolant inlet passage, the fourth passage 107 may be a coolant outlet passage, and the first passage 101 and the second passage 102 may be refrigerant inlet and outlet passages, respectively. The inflow or outflow passages for refrigerant or coolant may be selected according to the needs. Two of the four passages of the heat exchanger may be used to circulate the first fluid, and the other two may be used to circulate the second fluid.

[0016] As shown in Figures 1 and 2, the multiple plates 101 in this embodiment include a first plate 1, a second plate 2, and a third plate 3. The first plate 1, the second plate 2, and the third plate 3 are stacked sequentially along the stacking direction of plate 101, that is, stacked from top to bottom, with the second plate 2 positioned between the first plate 1 and the third plate 3. The heat exchanger in this embodiment includes a heat exchange unit A, which includes a first plate 1, a second plate 2, and a third plate 3, and the heat exchange unit A is a part of the structure of the heat exchanger. Since the structures of the first plate 1 and the third plate 3 in this embodiment are similar, only two types of plates 101 need to be manufactured. This facilitates the molding of the plates 101, reduces the number of plate types relatively, and further facilitates the assembly of the heat exchanger. Between the first plate 1 and the second plate 2, there is a first plate inter-plate passage S for circulating coolant. The flattened tube 4 is located between the second plate 2 and the third plate 3 and includes several through-holes 41 for circulating the refrigerant, the through-holes 41 not communicating with the first inter-plate passage S.

[0017] As shown in Figures 1 to 5, in this embodiment, the flange 1011 and the main body 1015 surround each other to form a housing chamber. In the present invention, the first plate 1 has a first storage chamber 13, the second plate 2 has a second storage chamber 25, and the third plate 3 has a third storage chamber 36. In this embodiment, the flattened tube 4 includes one flattened tube 4, which is located in the third housing chamber 36, and the flattened tube 4 in this embodiment is located in the heat exchange region 1012. This arrangement facilitates the assembly of the flattened pipe 4 and also facilitates the subsequent introduction or exit of the refrigerant into or out of the through-hole 41 of the flattened pipe 4. The flattened tube 4 includes several through-holes 41, which penetrate the flattened tube 4 along its length to form refrigerant passages. The flattened tube 4 has high structural strength and strong pressure resistance, and by using the structure of the flattened tube 4, the structural strength of the heat exchanger can be improved. In particular, when the refrigerant is carbon dioxide coolant, the operating pressure of carbon dioxide is high, but the structure of the flattened tube 4 can withstand the operating pressure of carbon dioxide. In other embodiments, a portion of the flattened tube 4 may be located in the heat exchange region 1012, and a portion of the flattened tube 4 may be located in the rectangular hole region.

[0018] In this embodiment, the through-holes 41 are arranged in a single row along the width direction of the heat exchanger, that is, several through-holes 41 are located in substantially the same straight line along the width direction of the heat exchanger, and by arranging them in this manner, the flow path of the refrigerant can be controlled and the heat exchange performance can be improved. In other embodiments, the through-holes 41 may be arranged in a wave-like pattern along the width direction of the heat exchanger, or randomly, thereby enabling the flow of refrigerant and heat exchange. In this embodiment, the upper surface of the flattened pipe 4 is welded in contact with the second plate 2, and its lower surface is welded in contact with the third plate 3. This prevents the refrigerant from flowing into the gap between the flat surface of the flat tube 4 and the plate 101, affecting the distribution of the refrigerant and thus the heat exchange efficiency. Furthermore, the refrigerant flows through the through-holes 41 of the flat tube 4, and the operating pressure of the refrigerant acts mainly on the flat tube 4, thereby improving the structural strength of the heat exchanger.

[0019] As shown in Figure 10, the flattened tube 4 includes a first side wall 43 and a second side wall 44, the first side wall 43 and the second side wall 44 are located on both sides of the flattened tube 4 along the width direction and extend along the length direction of the flattened tube 4. In this embodiment, the first side wall 43 is positioned to contact the flange 1011, and the second side wall 44 is positioned to contact the flange 1011. By arranging the components in this manner, the refrigerant flows into the through-holes 41 of the flat tubes 4, and the operating pressure of the refrigerant mainly acts on the flat tubes 4. This increases the pressure resistance of the flat tubes 4 and improves the structural strength of the heat exchanger. Furthermore, since the operating pressure of the refrigerant has little effect on the plates 101, it is possible to avoid deformation of the plates 101 or cracking of the welded joints between adjacent plates 101 when the operating pressure of the refrigerant is too high. In other embodiments, the first side wall 43 and the flange 1011 may be fitted together, and the second side wall 44 and the flange 1011 may also be fitted together, and the gap between the first side wall 43 and the flange 1011 provides a flow path for the refrigerant, and the gap between the second side wall 44 and the flange 1011 also provides a flow path for the refrigerant, thereby distributing the refrigerant and providing a flow path for the refrigerant.

[0020] In other embodiments, the flattened tube 4 is provided with multiple rows of through-holes 41, which are arranged in rows along the width direction of the heat exchanger and in columns along the height direction of the heat exchanger. By arranging multiple rows of through-holes 41, the flow paths of the refrigerant can be increased, thereby improving the heat exchange efficiency. In other embodiments, the through-holes 41 may be randomly arranged along the height and width directions of the heat exchanger. In this embodiment, the through-holes 41 are arranged as regular circular through-holes, thereby facilitating the molding of the through-holes 41. In other embodiments, the through-hole 41 may be a wavy or other shaped through-hole 41, that is, the inner circumferential wall forming the through-hole 41 is wavy or other shaped.

[0021] The heat exchanger of another embodiment includes a plurality of flattened tubes 4 stacked along the stacking direction of the plate 101, with adjacent flattened tubes 4 welded together and each flattened tube 4 includes several through holes 41. By arranging them in this way, more flow paths can be provided to the refrigerant, thereby enhancing the heat exchange performance of the heat exchanger.

[0022] As shown in Figure 11, in other embodiments, the multiple flattened tubes 4 are arranged at intervals along the length of the plate 101, the through-holes 41 of the flattened tubes 4 are located along the length of the plate 101, and there are gaps between adjacent flattened tubes 4 to allow the refrigerant to flow. With this arrangement, the refrigerant flows from the through-hole 41 of one flat pipe 4 through the gap to the through-hole 41 of the next flat pipe 4. This increases the number of refrigerant flow paths, thereby increasing the heat exchange area and improving the heat exchange efficiency of the heat exchanger. In other embodiments, along the longitudinal direction of the plate 101, a flow guide structure, such as a protrusion, may be provided in the gap between adjacent flat tubes 4, thereby facilitating the distribution of refrigerant by guiding the refrigerant from the through-hole 41 of one flat tube 4 into the through-hole 41 of another flat tube 4.

[0023] As shown in Figure 12, the heat exchanger of another embodiment includes a plurality of flattened tubes 4 arranged at intervals along the width direction of the plate 101, and the gaps between adjacent flattened tubes 4 allow the refrigerant to flow, thereby enabling heat exchange between the refrigerant and the coolant.

[0024] In other embodiments, the multiple flattened tubes 4 are arranged at intervals along the length of the plate 101, with gaps between the flattened tubes 4 arranged along the length of the plate 101, and simultaneously, the other multiple flattened tubes 4 are arranged at intervals along the width of the plate 101, with gaps between the flattened tubes arranged along the width of the plate 101. This allows for a longer flow path for the refrigerant, thereby improving the heat exchange efficiency of the heat exchanger.

[0025] As shown in Figures 6 to 9, the third plate 3 in this embodiment includes several flow guide portions 31, which are located in the first rectangular hole region 6 and on the outer circumference of the first rectangular hole 61. In this embodiment, the flow guides 31 are positioned close to the heat exchange region 1012, and several of the flow guides 31 are spaced apart along the outer circumference of the first corner hole 61. In this embodiment, the flow guide portion 31 has a groove and an upward-facing opening, and the flow guide portion 31 further includes a flow guide groove 311, and the first passage 104 communicates with the through-hole 41 in the flat pipe 4 via the flow guide groove 311, and by arranging the flow guide portion 31, the refrigerant can be distributed to the through-hole 41 in the flat pipe 4 via multiple paths, satisfying the distribution of refrigerant to the first corner hole region 6 and improving the heat exchange effect. In this embodiment, the arrangement of multiple flow guides 31 is advantageous for the distribution of the refrigerant.

[0026] In this embodiment, the third plate 3 further includes several first boss portions 33, the first boss portions 33 being located in the first rectangular hole region 6 and on the outer circumference of the first rectangular hole 61, the first boss portions 33 projecting upward relative to the upper plate surface of the third plate 3, the several first boss portions 33 and several flow guide portions 31 being spaced apart around the outer circumference of the first rectangular hole 61, and the first boss portions 33 projecting upward relative to the upper plate surface of the third plate 3.

[0027] In this embodiment, the second plate 2 includes several third protrusions 26 that engage with the flow guide portion 31, and the second plate 2 further includes several second boss portions 21 that engage with the first boss portion 33. Furthermore, several third protrusions 26 and several second bosses 21 are arranged at intervals along the outer circumference of the first rectangular hole 61, and the third protrusions 26 have grooves. The second boss portion 21 protrudes downward from the lower surface of the second plate 2, and the second boss portion 21 and the first boss portion 33 are in contact and welded together. The third protrusion 26 and the flow guide portion 31 surround each other to form a first passage 63, which communicates with the through hole 41 of the flat pipe 4, and the flow guide portion 31 guides the refrigerant to the through hole 41 of the flat pipe 4.

[0028] In this embodiment, the second horn region 7 of the third plate 3 includes several outlets 32, which are located on the outer periphery of the fourth horn 72 and are positioned close to the heat exchange region 1012, and are spaced apart around the outer periphery of the fourth horn 72. The outlet portion 32 has a groove and an upward-facing opening. In this embodiment, the outlet section 32 includes an outlet groove 321, and the fourth passage 107 communicates with the through-hole 41 on the flat pipe 4 via the outlet groove 321. By arranging the outlet groove 321, the refrigerant in the through-hole 41 of the flat pipe 4 is guided to the fourth passage 107, and the refrigerant flows out of the heat exchanger from the fourth passage 107. This reduces the flow resistance of the refrigerant and thus reduces the pressure drop of the refrigerant. In this embodiment, multiple outlet grooves 321 are arranged, thereby increasing the refrigerant outflow paths and reducing the refrigerant outflow resistance.

[0029] In this embodiment, the second rectangular hole region 7 of the third plate 3 further includes several third boss portions 34, the third boss portions 34 projecting upward from the upper plate surface of the third plate 3, the third boss portions 34 being located on the outer circumference of the fourth rectangular hole 72 and positioned in close proximity to the heat exchange region 1012, and the third boss portions 34 and several lead portions 32 being spaced apart along the outer circumference of the fourth rectangular hole 72. In this embodiment, the second plate 2 includes several fourth boss portions 22 that engage with the third boss portion 34, and several fourth protrusions 27 that engage with the lead portion 32, and the several fourth protrusions 27 and several fourth boss portions 22 are spaced apart along the outer circumference of the fourth corner hole 72. The fourth protrusion 27 has a groove. The fourth boss portion 22 protrudes downward from the lower surface of the second plate 2, and the third boss portion 34 and the fourth boss portion 22 are in contact with each other and connected by welding. The fourth protrusion 27 and the outlet 32 ​​surround each other, forming a concentric passage, namely the fourth concentric passage 74. As a result, the refrigerant flows from the through-hole 41 of the flat pipe 4 through the fourth passage 74 into the fourth passage 107, and the outlet section 32 guides the second fluid in the through-hole 41 into the fourth passage 107.

[0030] In this embodiment, the second plate 2 and the third plate 3 are welded all around the portion adjacent to the outer circumference of the second rectangular hole 62, and the second passage 105 does not communicate with the through hole 41 of the flat pipe 4. The second plate 2 and the third plate 3 are welded all around the portion adjacent to the outer circumference of the third rectangular hole 71, and the third passage 106 does not communicate with the through hole 41 of the flat pipe 4.

[0031] In this embodiment, the first plate 1 and the second plate 2 have a second passage 64 that is close to the outer circumference of the second corner hole 62, and the second passage 64 communicates with the first inter-plate passage S, and the second passage 105 communicates with the first inter-plate passage S via the second passage 64. The first plate 1 and the second plate 2 also have a third passage 73 that is close to the outer circumference of the third corner hole 71, and the third passage 73 communicates with the first inter-plate passage S, and the third passage 106 communicates with the first inter-plate passage S via the third passage 73. The first plate 1 and the second plate 2 are welded around the entire circumference of the first corner hole 61 so as to be close to the outer circumference, and the first passage 104 does not communicate with the first inter-plate passage S. The first plate 1 and the second plate 2 are welded around the entire circumference of the fourth corner hole 72 so as to be close to the outer circumference, and the fourth passage 107 does not communicate with the first inter-plate passage S.

[0032] In this embodiment, the flow guide groove 311 is a narrow groove with a small area, and thus the area of ​​the first boss portion 33 is relatively large, far larger than the area of ​​the flow guide portion 31. This increases the welding area between the first boss portion 33 and the second boss portion 21, improves the welding point density of the first corner hole 61, ensures the reliability of the structure after welding between the second plate 2 and the third plate 3, further enhances the structural strength of the heat exchanger, improves its pressure resistance against the refrigerant, and ensures the wall thickness of the first passage 104 and the strength of the structure after welding by arranging the first boss portion 33. Furthermore, the first boss portion 33 and the second boss portion 21 surround each other to form a passage, namely the first passage 63, through which the refrigerant flows from the first passage 104 through the first passage 63 into the through-hole 41 of the flattened pipe 4. In other embodiments, only one flow guide section 31 may be provided.

[0033] In this embodiment, the lead groove 321 is a narrow groove, and thus the area of ​​the third boss portion 34 is relatively large. This increases the welding area between the third plate 3 and the second plate 2, improves the welding point density around the fourth corner hole 72, and further enhances the structural strength of the heat exchanger. By positioning the third boss portion 34, the wall thickness of the fourth passage 107 and the structural strength after welding can be ensured. By arranging the first boss portion 33, the second boss portion 21, the third boss portion 34, and the fourth boss portion 22, the distance between the third plate 3 and the second plate 2 can be ensured, making it easier to seal between some of the square holes. In other embodiments, only one lead-out section 32 may be provided.

[0034] In this embodiment, the welding point density on the outer circumference of the first corner hole 61 and the welding point density on the outer circumference of the fourth corner hole 72 are relatively larger than the welding point density on the outer circumference of the second corner hole 62, and the welding point density on the outer circumference of the first corner hole 61 and the welding point density on the outer circumference of the fourth corner hole 72 are relatively larger than the welding point density on the outer circumference of the third corner hole 71. By arranging the heat exchanger in this manner, the pressure capacity of the heat exchanger relative to the operating pressure of the refrigerant, particularly carbon dioxide refrigerant, can be improved. Furthermore, the welding point density on the outer circumference of the second and third corneal holes 62 and 71 is low, saving solder while still meeting the pressure capacity requirements of the heat exchanger relative to the operating pressure of the coolant. Of course, the welding point density on the outer circumference of the four corner holes in other embodiments is basically the same.

[0035] In other embodiments, when a portion of the flattened tube 4 is located in the heat exchange region 1012 and a portion of the flattened tube 4 is located in the first and / or second horn region 6, a guide portion 31 and an outlet portion 32 are provided on the side of the first and / or second horn region 6 that is close to the flange 1011, thereby increasing the contact area between the refrigerant and the flattened tube 4 and increasing the strength of the heat exchanger.

[0036] As shown in Figures 2 to 5, the heat exchanger of this embodiment further includes fins 5, the fins 5 are located in the second accommodation chamber 25, at least a portion of the fins 5 are located in the heat exchange region 1012, and the wall forming the first inter-plate passage S includes the fins 5. The upper end surface of fin 5 is welded and fixed to the lower plate surface of the first plate 1, and its lower end surface is welded and fixed to the upper plate surface of the second plate 2. In this embodiment, the fin 5 includes several fifth protrusions 51 and first grooves 52, the fifth protrusions 51 having downward-facing openings and the first grooves 52 having upward-facing openings, and there is at least one first groove 52 between adjacent fifth protrusions 51, and the fifth protrusions 51 and the first grooves 52 form a coolant flow passage, and by arranging the fin 5, the flow path of the coolant can be increased and heat exchange between the refrigerant and the coolant can be improved. The present invention merely illustrates the structure of one fin 5, and in other embodiments, the fin 5 may be provided with only a fifth protrusion 51 or only a first groove 52, and the configuration of the fin 5 is diverse. In other embodiments, the heat exchanger may not have fins, there may be no turbulence structure between the first plate 1 and the second plate 2, and the coolant may flow between the plate surfaces of the first plate 1 and the second plate 2.

[0037] As shown in Figures 13 to 17, the heat exchanger of the second embodiment does not have fins 5, and the plate 101 is a dot wave plate. In this embodiment, the second plate 2 has several first protrusions 24, which are spaced apart, and the first protrusions 24 project upward relative to the upper surface of the second plate 2 and also project toward the first plate 1. There is a groove on the side of the first protrusions 24 that faces the third plate 3, and trenches are formed between adjacent first protrusions 24. The flow of the coolant must bypass the first protrusions 24, and by arranging the first protrusions 24, the turbulent effect of the second plate 2 on the coolant can be improved. Furthermore, the flow path of the coolant can be widened, increasing the contact area between the coolant and the refrigerant, and improving the heat exchange efficiency. Correspondingly, the first plate 1 is provided with a second protrusion 12, which protrudes downward from the lower surface of the first plate 1 and also protrudes toward the second plate 2. The side of the second protrusion 12 facing the second plate 2 has a groove, forming a trench between adjacent second protrusions 12. At least some of the bottom ends of the second protrusions 12 and the tips of the first protrusions 24 are in contact and welded together, forming a coolant passage between the first protrusions 24 and the second protrusions 12. This increases the space for coolant flow, and the coolant flow needs to bypass the protrusions of the second protrusions 12. This further widens the flow path of the coolant, improving the turbulent effect of the plate 101 on the coolant, and the connection strength of the plate 101 can be strengthened by welding the second protrusion 12 and the first protrusion 24. In other embodiments, the second plate 2 may have a first protrusion 24, and the first plate 1 may not have a second protrusion 12, with the second protrusion contacting and being welded to the lower surface of the plate 2; or the second plate 2 may not have a first protrusion 24, and the first plate 1 may have a second protrusion 12, with the second protrusion 12 contacting and being welded to the upper surface of the second plate 2. This also increases the flow path of the coolant.

[0038] In this embodiment, the third plate 3 and the first plate 1 each have a first protrusion 37. The rectangular hole region of the third plate 3 has a first protrusion 37 that projects toward the second plate 2. The side of the first protrusion 37 that faces the second plate 2 has a groove. The first protrusion 37 is provided on the outer circumference of the first rectangular hole 61 and the outer circumference of the fourth rectangular hole 72 of the third plate 3. In the portion of the third plate 3 adjacent to the outer circumference of the first corner hole 61, a trench is formed between adjacent first protrusions 37, guiding the refrigerant from the first passage 104 to the through hole 41 of the flat pipe 4. In the portion of the third plate 3 adjacent to the outer circumference of the fourth corner hole 72, a trench is formed between adjacent first protrusions 37, guiding the refrigerant from the through hole 41 of the flat pipe 4 to the fourth passage 107.

[0039] In this embodiment, the rectangular hole region of the second plate 2 has a second protrusion 28 that engages with the first protrusion 37. This second protrusion 28 is provided on the outer circumference of the first rectangular hole 61 and the outer circumference of the fourth rectangular hole 72 of the first plate 1, and protrudes toward the third plate 3. The side of the second protrusion 28 that is close to the first plate 1 has a groove. The second protrusion 28 of plate 2 and the first protrusion 37 of plate 3 are in contact with and fixed by welding to the outer circumference of the first corner hole 61. This improves the connection strength between the third plate 3 and the second plate 2, further increasing the strength of the heat exchanger and improving its pressure resistance.

[0040] In other embodiments, the third plate 3 is not provided with the first protrusion 37, the second plate 2 is not provided with the second protrusion 28, the outer circumference of the first square hole 61 of the third plate 3 is provided with a flow guide portion 31 and a first boss portion 33, the outer circumference of the fourth square hole 72 of the third plate 3 is provided with an outlet portion 32 and a third boss portion 34, the outer circumference of the first square hole 61 of the second plate 2 is provided with a third protrusion 26 and a second boss portion 21, and the outer circumference of the fourth square hole 72 of the second plate 2 is provided with a fourth protrusion 27 and a fourth boss portion 22. This also enables a flow-guiding effect on the refrigerant, thereby increasing the strength of the heat exchanger.

[0041] In other embodiments, the second plate 2 may be a single N-shaped plate or a multi-N-shaped plate (not shown). In the case of a single N-shaped plate, the first protrusion 24 includes two extending segments (not shown) arranged at an angle, each extending segment being inclined with respect to the length of the plate 101, and the two extending segments may be arranged symmetrically or asymmetrically along the width of the plate 101. As a multi-layered V-shape, the first protrusion 24 includes multiple extending segments arranged at an angle, each extending segment being inclined with respect to the length of the plate 101, and the number of extending segments is greater than two. Of course, in other embodiments, the plate 101 may be configured with a different structure to lengthen the flow path of the coolant. In this invention, only the structure of the two point-wave plate 101 is shown, and the configurations of the first protrusion 24 and the second protrusion 12 are not limited to those described above and may vary.

[0042] In other embodiments, flattened tubes 4 are provided between adjacent plates, and coolant flows through the through-holes 41 between plate 101 and the adjacent plate 101, and refrigerant flows through the through-holes 41 between plate 101 and other adjacent plates 101. The coolant and refrigerant flow within the through-holes 41 of the flattened tubes 4 to perform heat exchange. For example, a flat pipe 4 is provided between the first plate 1 and the second plate 2, and a flat pipe 4 is also provided between the second plate 2 and the third plate 3. The flat pipe 4 between the first plate 1 and the second plate 2 allows the refrigerant to flow, and the flat pipe 4 between the second plate 2 and the third plate 3 allows the coolant to flow, thereby enabling heat exchange between the refrigerant and the coolant.

[0043] Herein, the above embodiments are not intended to limit the present invention, but are used solely to illustrate the present invention. The present invention has already been described in detail in this specification with reference to the above embodiments, but amendments or equivalent substitutions may be made to this application, and any improvements that do not depart from the spirit and scope of this application should fall within the scope of the claims of this application.

Claims

1. A heat exchanger comprising a flattened tube (4) and a plurality of plates (101), Multiple plates (101) are arranged to be stacked, Between at least one pair of adjacent plates (101) along the stacking direction of the plates (101), the flattened tubes (4) are provided. The flattened tube (4) has several through holes (41), Between at least another pair of adjacent plates (101), there is a first inter-plate passage (S), The heat exchanger includes a first channel and a second channel that are not in communication with each other. The fluid in the first channel and the fluid in the second channel are capable of heat exchange. The through-hole (41) of the flattened tube (4) is part of the first flow path, A heat exchanger characterized in that the first interplate passage (S) is part of the second flow path.

2. Between at least one of the plates (101) and an adjacent plate (101), there is the flattened tube (4). The heat exchanger according to claim 1, characterized in that there is a first inter-plate passage (S) between the aforementioned plate (101) and another adjacent plate (101).

3. Between the plate (101) and the adjacent plate (101), there is the flattened tube (4). Between the aforementioned plate (101) and another adjacent plate (101), there is a first inter-plate passage (S). The heat exchanger according to claim 1 or 2, characterized in that the first inter-plate passage (S) and the flattened tube (4) are arranged alternately along the stacking direction of the plates (101).

4. The plurality of plates (101) include a first plate (1), a second plate (2), and a third plate (3), The first plate (1), the second plate (2), and the third plate (3) are arranged to be stacked in order. The heat exchanger further includes fins (5) located between the second plate (2) and the adjacent first plate (1), The wall forming the first interplate passage (S) includes the fin (5), The heat exchanger according to any one of claims 1 to 3, characterized in that the flattened tube (4) is located between the second plate (2) and the third plate (3) adjacent thereto.

5. The flattened tube (4) is parallel to the plate surface of the plate (101), The flattened pipe (4) is connected to the second plate (2) by welding its upper surface, and to the third plate (3) by welding its lower surface. The heat exchanger according to claim 4, characterized in that the through hole (41) penetrates the flattened tube (4) along the longitudinal direction of the flattened tube (4).

6. The flattened tube (4) includes one flattened tube (4), The flattened tube (4) includes several of the through holes (41), Alternatively, the flattened tube (4) may include a plurality of flattened tubes (4), Each of the aforementioned flattened tubes (4) includes several of the aforementioned through holes (41), The heat exchanger according to claim 5, characterized in that the plurality of flattened tubes (4) are arranged in a stack along the height direction of the heat exchanger, or are arranged at intervals along the width direction of the heat exchanger, and / or are arranged at intervals along the length direction of the heat exchanger.

7. The plate (101) includes a main body (1015) and a flange (1011). The main body (1015) includes a heat exchange region (1012), The flange (1011) is arranged along the circumferential direction of the main body (1015) and protrudes upward relative to the main body (1015), At least a portion of the flattened tube (4) is located in the heat exchange region (1012), The flattened tube (4) includes a first side wall (43) and a second side wall (44), The first side wall (43) and the second side wall (44) are located on both sides of the flattened pipe (4) along its width direction. The first side wall (43) and the flange (1011) are fitted together or arranged to be in contact with each other. The heat exchanger according to claim 6, characterized in that the second side wall (44) and the flange (1011) are fitted together or arranged to be in contact with each other.

8. The heat exchanger includes four passages: a first passage (104), a second passage (105), a third passage (106), and a fourth passage (107). Along the width direction of the heat exchanger, the first passage (104) and the third passage (106) are located on the same side of the heat exchanger. The second passage (105) and the fourth passage (107) are located on the same side of the heat exchanger. The first passage (104) and the fourth passage (107) are arranged diagonally, The second passage (105) and the third passage (106) are arranged diagonally, Two of the four passages of the heat exchanger allow the first fluid to flow through them, communicate with the flattened pipe (4) via the through-hole (41), and do not communicate with the first inter-plate passage (S). The heat exchanger according to claim 7, characterized in that the other two of the four passages allow the second fluid to flow through, communicate with each other via the first inter-plate passage (S), and do not communicate with the through-hole (41).

9. The third plate (3) includes several flow guide portions (31) and several first boss portions (33), Some of the flow guide portions (31) and some of the first boss portions (33) are arranged at intervals along the outer circumference of the first rectangular hole (61), The flow guide portion (31) has a groove, The first boss portion (33) protrudes upward from the upper plate surface of the third plate (3), The second plate (2) includes several third protrusions (26) that engage with the flow guide portion (31), The second plate (2) further includes several second boss portions (21) that engage with the first boss portion (33), Some of the third protrusions (26) and some of the second bosses (21) are arranged at intervals along the outer circumference of the first rectangular hole (61), The third protrusion (26) has a groove, The second boss portion (21) protrudes downward from the lower plate surface of the second plate (2), The second boss portion (21) and the first boss portion (33) are in contact and welded together. The third protrusion (26) and the flow guide portion (31) form a first passage (63) that surrounds each other. The first passage (63) communicates with the through hole (41) of the flattened pipe (4), and / or the third plate (3) includes several lead-out portions (32) and several third boss portions (34), Some of the third boss portions (34) and some of the lead portions (32) are arranged at intervals along the outer circumference of the fourth corner hole (72), The outlet portion (32) has a groove, The third boss portion (34) protrudes upward from the upper plate surface of the third plate (3), The second plate (2) further includes several fourth protrusions (27) and several fourth bosses (22), Some of the fourth protrusions (27) and some of the fourth bosses (22) are arranged at intervals along the outer circumference of the fourth rectangular hole (72), The fourth protrusion (27) has a groove, The fourth boss portion (22) protrudes downward from the lower plate surface of the second plate (2), The third boss portion (34) and the fourth boss portion (22) are welded together. The fourth protrusion (27) and the outlet (32) form a fourth hole (74) that surrounds each other. The heat exchanger according to claim 8, characterized in that the fourth passage (74) is in communication with the through hole (41) of the flattened pipe (4).

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