heat exchanger

Abstract

A heat exchanger is disclosed, the heat exchanger including a first tube, a second tube, a third tube, and a fourth tube, a first heat exchange tube, and a second heat exchange tube, the first heat exchange tube communicating between the first and third tubes, the second heat exchange tube communicating between the second and fourth tubes, the second heat exchange tube including a first bent portion and a first straight portion, one end of the first bent portion connected to the second tube and the other end of the first bent portion connected to one end of the first straight portion, first and second passages provided in both the first and second heat exchange tubes, at least one second passage of the first heat exchange tube projected between the first passage of the first heat exchange tube and the first passage of the first bent portion in the width direction of the first heat exchange tube, and at least one first passage of the first bent portion is located between the second passage of the first heat exchange tube and the second passage of the first bent portion. The heat exchanger of the present disclosure improves heat exchange efficiency and heat exchange effect.

Description

[Technical Field]

[0001] [Cross-Citation of Related Applications] This disclosure claims priority to and the benefit of Chinese patent application number 202011444633.3, filed on December 8, 2020, the entire contents of which are incorporated herein by reference.

[0002] The present disclosure relates to the technical field of heat exchangers, and more particularly to heat exchangers used in refrigeration systems. [Background technology]

[0003] Multi-refrigeration system air conditioners employ multiple independent refrigerant circuits. Related technologies have shown that multiple refrigerant circuits can employ multi-passage heat exchangers as shared heat exchangers, with each multi-passage heat exchanger sharing a single fan system and a single ventilation surface. Because multi-passage heat exchangers have multiple refrigerant passages spaced apart, the refrigerant temperature at the refrigerant inlet and outlet of the heat exchange tubes differs significantly from the air temperature during operation. Furthermore, the air temperature differs depending on the intake direction, resulting in significant differences in the heat exchange efficiency between the passages at the inlet and outlet of the heat exchange tubes, which is detrimental to the overall heat exchange performance of the heat exchanger. Summary of the Invention [Problem to be solved by the invention]

[0004] Therefore, the present disclosure proposes a heat exchanger in which a plurality of heat exchange tubes are arranged in a specific order, which is advantageous in improving the heat exchange performance of the entire heat exchanger. [Means for solving the problem]

[0005] A heat exchanger according to an embodiment of the present disclosure includes a first assembly including a first tube and a second tube, a second assembly including a third tube and a fourth tube, and a plurality of heat exchange tubes, each of which has a substantially flattened outer peripheral profile in cross section, each of which includes a plurality of passages arranged in a longitudinal direction of the heat exchange tube, the plurality of passages being arranged at intervals in a width direction of the heat exchange tube, the plurality of passages including a first passage and a second passage, a cross-sectional flow area of ​​the first passage in the cross section of the heat exchange tube being larger than the cross-sectional flow areas of the other passages in the cross section of the heat exchange tube, and the heat exchanger includes a plurality of passages arranged in a longitudinal direction of the heat exchange tube, the plurality of passages being arranged at intervals in a width direction of the heat exchange tube, the plurality of passages including a first passage and a second passage, a cross-sectional flow area of ​​the second passage in a cross section of the heat exchange tube is smaller than a cross-sectional flow area of ​​the other passages in the cross section of the heat exchange tube; the heat exchange tube includes a first heat exchange tube and a second heat exchange tube; one longitudinal end of the first heat exchange tube communicates with the first tube, the other longitudinal end of the first heat exchange tube communicates with the third tube, one longitudinal end of the second heat exchange tube communicates with the second tube, and the other longitudinal end of the second heat exchange tube communicates with the fourth tube, so as to communicate the first tube with the third tube; the second heat exchange tube includes a first bent portion and a first straight portion; a plurality of heat exchange tubes, one end of which is connected to the second tube and the other end of which is connected to one end of the first straight portion, the first heat exchange tubes and the second heat exchange tubes being spaced apart in the longitudinal direction of the first tubes; and fins including first fins, wherein at least some of the first fins are connected to one of the first heat exchange tubes and at least some of the first fins are connected to one of the second heat exchange tubes in the longitudinal direction of the first tubes, and the first heat exchange tubes, the first fins, and the second heat exchange tubes are sequentially arranged in the longitudinal direction of the first tubes. a first plane is defined as a plane perpendicular to the longitudinal direction of the first tubes and parallel to the width and longitudinal directions of the first heat exchange tubes, and within the first plane, an angle is formed between a longitudinal direction of a projection of a part of the tube portion of the first bent portion of one of the second heat exchange tubes and a longitudinal direction of a projection of the first straight portion of the second heat exchange tube, and a projection of at least one second passage of the first heat exchange tube is located between a first passage of the first heat exchange tube and a first passage of the first bent portion in the width direction of the first heat exchange tube,At least one first passage of the first bent portion is located between the second passage of the first heat exchange tube and the second passage of the first bent portion.

[0006] The heat exchanger of the embodiment of the present disclosure has a plurality of heat exchange tubes arranged in a specific order, which is advantageous for improving the heat exchange efficiency and heat exchange effect of the heat exchanger.

[0007] In some embodiments, at least a portion of the first bent portion of the second heat exchange tube is disposed within the second tube, the portion of the first bent portion disposed within the second tube has a maximum length H, an equivalent diameter D of the second tube, and a ratio of the maximum length H to the equivalent diameter D is greater than or equal to 1 / 3 and less than or equal to 2 / 3.

[0008] In some embodiments, the number of the first passages is multiple, and the multiple first passages are spaced apart in the width direction of the heat exchange tube, and / or the number of the second passages is multiple, and the multiple second passages are spaced apart in the width direction of the heat exchange tube.

[0009] In some embodiments, a projection of a second passage of at least one of the first heat exchange tubes onto the first plane and a projection of a first passage of at least one of the first bent portions onto the first plane partially intersect, and an angle b of the intersection is greater than 20° and less than 65°. In some embodiments, a first sub-pipe is provided within the first pipe, the first sub-pipe including a flow path and a pipe wall surrounding the flow path, the longitudinal direction of the flow path being parallel to the longitudinal direction of the first pipe, the pipe wall being provided with a first through-hole penetrating the pipe wall in a thickness direction, the first through-hole connecting the first pipe and the first sub-pipe, and a second sub-pipe is provided within the second pipe, the second sub-pipe including a flow path and a pipe wall surrounding the flow path, the longitudinal direction of the flow path being parallel to the longitudinal direction of the second pipe, the pipe wall being provided with a second through-hole penetrating the pipe wall in a thickness direction, the second through-hole a through hole connecting the second pipe with the flow path of the second sub-pipe, the first through hole and the second through hole are plural, the first through holes are arranged at intervals in the longitudinal direction of the first pipe, the second through holes are arranged at intervals in the longitudinal direction of the second pipe, and in the first plane, the number of projections of the first through holes toward the first passage of the first heat exchange pipe is greater than the number of projections of the first through holes toward the second passage of the first heat exchange pipe, and / or the number of projections of the second through holes toward the first passage of the first bent portion is greater than the number of projections of the second through holes toward the second passage of the first bent portion.

[0010] In some embodiments, a first plate is provided within the second tube, the first plate dividing the flow path of the second tube into a first flow path and a second flow path, a portion of the tube in the first bent portion is located within the first flow path and communicates with the first flow path, the first plate includes a portion of an inclined surface, and during operation of the heat exchanger, the inclined surface directs more refrigerant to flow into the first passage in the first bent portion.

[0011] In some embodiments, the first plate includes a first surface facing the first bent portion and a second surface facing away from the first bent portion, at least a portion of the first surface is an inclined surface, a projection line of the first plate in the first plane is inclined with respect to the width direction of the first heat exchange tube, a minimum distance from a projection of an end surface of a first passage of the first bent portion located in a second tube to the first surface is L1, a minimum distance from a projection of an end surface of a second passage of the first bent portion located in a second tube to the first surface is L2, and the distance L1 is smaller than the distance L2.

[0012] In some embodiments, the first plate includes a first surface facing the first bent portion and a second surface facing away from the first bent portion, the first surface including two intersecting inclined surfaces, and within the first plane, projection lines of the two inclined surfaces of the first surface include at least two intersecting line segments, the distance from the intersection of the two line segments to a projection of an end surface of the first bent portion located within the second pipe is L3, the minimum distance from a projection of an end surface of a first passage of the first bent portion located within the second pipe to the first surface is L1, and the minimum distance from a projection of an end surface of the second passage of the first bent portion located within the second pipe to the first surface is L2, and L3 is smaller than L1 and / or L3 is smaller than L2.

[0013] In some embodiments, the second secondary pipe is disposed within a second flow path of the second pipe, and the first plate includes a third through hole passing through the first plate in a thickness direction, the third through hole connecting the first flow path with the flow path of the second secondary pipe.

[0014] In some embodiments, at least a portion of the first heat exchange tube is located within the first tube, and in the first plane, a projection of an end face of the first heat exchange tube located within the first tube forms an angle with a projection of a cross section of the first heat exchange tube, and a length of the first passage located within the first tube is greater than a length of the second passage located within the first tube, and / or, in the first plane, a projection of an end face of a first bent portion located within the second tube forms an angle with a projection of a cross section of the second heat exchange tube, and a length of the first passage located within the second tube is greater than a length of the second passage located within the second tube.

[0015] In some embodiments, the tube portion extending to the first heat exchange tube includes a first step portion, the dimension of the first step portion in the width direction of the first heat exchange tube is smaller than the width of the first heat exchange tube, a projection of an end face of a first passage of the first heat exchange tube and a projection of the first step portion overlap in the first plane, and the width of the first step portion is smaller than 1 / 2 of the width of the first heat exchange tube. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a schematic perspective view of the overall structure of a heat exchanger according to an embodiment of the present disclosure; [Figure 2] 1 is a schematic side view of the overall structure of a heat exchanger according to an embodiment of the present disclosure. FIG. [Figure 3] 3 is a schematic cross-sectional view of a heat exchange tube of the heat exchanger of FIG. 2. [Figure 4] FIG. 3 is a partial schematic configuration diagram of the heat exchanger of FIG. 2. [Figure 5] FIG. 2 is a schematic diagram of a first secondary tube and a second secondary tube of a heat exchanger according to an embodiment of the present disclosure. [Figure 6] 1 is a schematic diagram of a first plate of a heat exchanger according to an embodiment of the present disclosure. [Figure 7] 2 is a schematic diagram of a first plate of a heat exchanger according to an embodiment of the present disclosure. [Figure 8] 1 is a schematic diagram of the arrangement of the first plate and the second secondary tube of the heat exchanger of the embodiment of the present disclosure. [Figure 9]1 is a schematic diagram of an arrangement in which the end faces of the heat exchange tubes of a heat exchanger according to an embodiment of the present disclosure are inclined surfaces. [Figure 10] FIG. 2 is a schematic diagram of a first step of a heat exchanger according to an embodiment of the present disclosure. [Figure 11] 2 is a schematic diagram of the arrangement of the first plate and the second secondary tube of the heat exchanger of the embodiment of the present disclosure. [Figure 12] 3 is a schematic diagram of the arrangement of the first plate and the second secondary tube of the heat exchanger of the embodiment of the present disclosure. [Figure 13] 4 is a schematic diagram of the arrangement of the first plate and the second secondary tube of the heat exchanger of the embodiment of the present disclosure. [Figure 14] 5 is a schematic diagram of the arrangement of the first plate and the second secondary tube of the heat exchanger of the embodiment of the present disclosure. [Figure 15] 2 is a schematic side view 2 of the overall structure of a heat exchanger according to an embodiment of the present disclosure. [Explanation of symbols]

[0017] First pipe 1, third flow path 11, fourth flow path 12, Second pipe 2, first flow path 21, second flow path 22, 3rd tube 3, 4th tube 4, First heat exchange tube 5, first passage (first heat exchange tube) 51, second passage (first heat exchange tube) 52, first step portion 53, Second heat exchange tube 6, first bent portion 61, first straight portion 62, first passage (second heat exchange tube) 63, second passage (second heat exchange tube) 64, second bent portion 65, First sub pipe 7, first through hole 71, Second sub pipe 8, second through hole 81, First plate 9, first surface 91, first inclined surface 911, second inclined surface 912, second surface 92, third through hole 93, 1st fin 10. DETAILED DESCRIPTION OF THE INVENTION

[0018] The following describes in detail embodiments of the present disclosure, examples of which are illustrated in the drawings. The embodiments described below with reference to the accompanying drawings are illustrative and are intended to explain the present disclosure and should not be construed as limitations on the present disclosure. In describing the present disclosure, it should be understood that the orientations or positional relationships indicated by terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" are orientations or positional relationships shown in the drawings. These terms are intended merely to explain and simplify the present disclosure and do not necessarily indicate or imply that the devices or elements shown necessarily have a specific orientation or are constructed and operated in a specific orientation, and therefore should not be construed as limitations on the present disclosure.

[0019] 2 and 3, a heat exchanger according to an embodiment of the present disclosure includes a first assembly, a second assembly, a plurality of heat exchange tubes, and fins (not shown). The first assembly includes a first tube 1 and a second tube 2, and the second assembly includes a third tube 3 and a fourth tube 4. The second assembly is located above the first assembly. Specifically, in this embodiment, the third tube 3 is located above the first tube 1, and the fourth tube 4 is located above the second tube 2.

[0020] The outer peripheral contour of the cross section of the heat exchange tube is generally flattened, the heat exchange tube includes a plurality of passages arranged in the longitudinal direction thereof, the plurality of passages being spaced apart in the width direction of the heat exchange tube, the plurality of passages including first passages and second passages, the cross-sectional flow area of ​​the first passage in the cross section of the heat exchange tube being larger than the cross-sectional flow areas of the other passages in the cross section of the heat exchange tube, and the cross-sectional flow area of ​​the second passage in the cross section of the heat exchange tube being smaller than the cross-sectional flow areas of the other passages in the cross section of the heat exchange tube.

[0021] Specifically, as shown in FIG. 3 , the heat exchange tube of this embodiment is a flat tube with multiple passages. The passages within the heat exchange tube can be divided into first and second passages according to the size of their cross-sectional flow areas. Within the same heat exchange tube, the first passages have the largest cross-sectional flow area, and the second through-holes 81 have the smallest cross-sectional flow area. The heat exchange tube of this embodiment may include only a plurality of first passages and a plurality of second passages. The first passages and the second passages are spaced apart in the width direction of the heat exchange tube (the left-right direction in FIG. 3 ), with the first passages located on the left side of the heat exchange tube and the second passages located on the right side of the heat exchange tube. In some other embodiments, the heat exchange tube may further include a plurality of third passages, a plurality of fourth passages, etc. between the first and second passages. The cross-sectional flow areas of the third and fourth passages, etc., located between the first and second passages are between the cross-sectional flow areas of the first and second passages.

[0022] The heat exchange tubes include a first heat exchange tube 5 and a second heat exchange tube 6, and one longitudinal end of the heat exchange tube 5 is connected to the first tube 1, the other longitudinal end of the first heat exchange tube 5 is connected to the third tube 3, one longitudinal end of the second heat exchange tube 6 is connected to the second tube 2, and the other longitudinal end of the second heat exchange tube 6 is connected to the fourth tube 4, so as to connect the first tube 1 and the third tube 3, and the second heat exchange tube 6 includes a first bent portion 61 and a first straight portion 62, one end of the first bent portion 61 is connected to the second tube 2 and the other end of the first bent portion 61 is connected to one end of the first straight portion 62, and the first heat exchange tube 5 and the second heat exchange tube 6 are arranged at a distance in the longitudinal direction of the first tube 1.

[0023] Specifically, the heat exchange tubes of this embodiment can be divided into a first heat exchange tube 5 and a second heat exchange tube 6, and the first heat exchange tube 5 and the second heat exchange tube 6 are arranged at intervals in the longitudinal direction of the first tube 1 (the direction perpendicular to the page in FIG. 2). Note that a plurality of the first heat exchange tubes 5 and the second heat exchange tubes 6 of this embodiment may be provided, and the plurality of first heat exchange tubes 5 and the plurality of second heat exchange tubes 6 are arranged alternately at intervals in the longitudinal direction of the first tube 1.

[0024] 2, the first heat exchange tube 5 is a flat tube, and one end of the first heat exchange tube 5 in the longitudinal direction (vertical direction in FIG. 2) communicates with the first tube 1, and the other end of the first heat exchange tube 5 in the longitudinal direction communicates with the third tube 3. When the heat exchanger is in operation, the refrigerant flows through the first tube 1, the first heat exchange tube 5, and the third tube 3 in this order.

[0025] 2, the second heat exchange tube 6 in this embodiment includes a first bent portion 61 and a first straight portion 62. The first straight portion 62 is parallel to the first heat exchange tube 5. One end of the first bent portion 61 communicates with one end of the first straight portion 62, and the other end of the first bent portion 61 communicates with the third tube 3. The other end of the first straight portion 62 can also directly communicate with the fourth tube 4. When the heat exchanger is operating, the refrigerant flows through the third tube 3, the first bent portion 61, the first straight portion 62, and the fourth tube 4 in that order. In some other embodiments, the second heat exchange tube 6 may further include a second bent portion 65, and one end of the first straight portion 62 may be connected to the first bent portion 61, and the other end of the first straight portion 62 may be connected to the second bent portion 65. That is, the first bent portion 61 may be located between the first straight portion 62 and the third tube 3, and the second bent portion 65 may be located between the first straight portion 62 and the fourth tube 4. In this embodiment, the longitudinal direction of a portion of the tube part of the first bent portion 61 (from the upper left to the lower right in FIG. 2 ) forms an obtuse angle with the longitudinal direction of the first straight portion 62 (the vertical direction in FIG. 2 ).

[0026] As shown in Figure 1, the fins include first fins 10, and in the longitudinal direction of the first tube 1 (front-to-back direction in Figure 1), at least some of the first fins 10 are connected to one first heat exchange tube 5, and at least some of the first fins 10 are connected to one second heat exchange tube 6, and the first heat exchange tube 5, the first fins 10 and the second heat exchange tube 6 are arranged sequentially in the longitudinal direction of the first tube 1, and there are two or more first fins 10.

[0027] Specifically, the first heat exchange tube 5 and the second heat exchange tube 6 are arranged at an interval in the longitudinal direction of the first tube 1, so that one side of the first fin 10 is connected to the first heat exchange tube 5 and the other side of the first fin 10 is connected to the second heat exchange tube 6. When a plurality of first heat exchange tubes 5 and a plurality of second heat exchange tubes 6 are provided, a first fin 10 is connected between every adjacent first heat exchange tube 5 and second heat exchange tube 6.

[0028] A plane perpendicular to the longitudinal direction of the first tube 1 and parallel to the longitudinal direction of the width direction of the first heat exchange tube 5 is defined as the first plane, and within the first plane, the longitudinal direction of the projection of a portion of the tube portion of the first bent portion 61 of one second heat exchange tube 6 forms an angle with the longitudinal direction of the projection of the first straight portion 62 of the second heat exchange tube 6, and in the width direction of the first heat exchange tube 5, the projection of the second passage of at least one first heat exchange tube 5 is located between the first passage of the first heat exchange tube 5 and the first passage of the first bent portion 61, and the first passage of at least one first bent portion 61 is located between the second passage of the first heat exchange tube 5 and the second passage of the first bent portion 61.

[0029] 2, the width direction of the first heat exchange tube 5 is the left-right direction, the longitudinal direction of the first heat exchange tube 5 is the up-down direction, and the longitudinal direction of the first tube 1 is perpendicular to the page of FIG. 2, so the first plane in this embodiment can be regarded as the page of FIG. 2. Within the first plane, the projection of the first straight portion 62 of the second heat exchange tube 6 overlaps with the projection of the first heat exchange tube 5, the projection of a portion of the first bent portion 61 of the second heat exchange tube 6 is located behind the first straight portion 62 of the second heat exchange tube 6, and the angle formed by the projection of the first bent portion 61 of the first heat exchange tube 5 and the projection of the first straight portion 62 of the second heat exchange tube 6 is an obtuse angle.

[0030] In a first plane, the projections of at least one first passage (first heat exchange tube) 51 onto the first plane, the projections of at least one second passage (first heat exchange tube) 52 onto the first plane, the projections of at least one first passage (second heat exchange tube) 63 onto the first plane, and the projections of at least one second passage (second heat exchange tube) 64 onto the first plane are sequentially arranged from left to right. Note that in some other embodiments, the projections of at least one second passage (first heat exchange tube) 52 onto the first plane, the projections of at least one first passage (first heat exchange tube) 51 onto the first plane, the projections of at least one second passage (second heat exchange tube) 64 onto the first plane, and the projections of at least one first passage (second heat exchange tube) 63 onto the first plane are sequentially arranged from left to right.

[0031] The heat exchanger of the present disclosure utilizes a large heat exchange temperature difference at the inlet of the heat exchanger. At the inlet / outlet ends of the heat exchange tubes, near the junction between the heat exchange tubes and the collecting tube (first or second tube), the heat exchange temperature difference between the refrigerant and the air is large, but the refrigerant flow rate in the passage with a relatively large cross-sectional area is also large, thus advantageously improving overall heat exchange performance. In some embodiments, the heat exchanger is installed with the heat exchange tubes vertical and the collecting tube horizontal, i.e., with the first and second tubes located at the bottom and the third and fourth tubes located at the top, and is used as an evaporator or indoor heat exchanger. Refrigerant enters the heat exchanger from the lower collecting tube (first or second tube). During operation of the second heat exchange tube, under the action of gravity, gas-liquid separation occurs in the refrigerant flowing from the second tube 2 to the first bend 61, and the refrigerant with a larger liquid phase flows primarily through the first passage (second heat exchange tube) 63. The cross-sectional area of ​​the first passage is larger than that of the second passage, allowing more liquid-phase refrigerant to flow through the first passage, and utilizing the large heat exchange temperature difference to further improve the heat exchange efficiency of the heat exchanger.The heat exchange tubes of the heat exchanger of the embodiment of the present disclosure are arranged in a specific order, improving the heat exchange efficiency and heat exchange effect of the heat exchanger.

[0032] In some embodiments, as shown in FIG. 4 , the first bent portion 61 of the second heat exchange tube 6 is at least partially located within the second tube 2, the maximum length of the tube portion of the first bent portion 61 located within the second tube 2 is H, the equivalent diameter of the second tube 2 is D, and the ratio of the maximum length H to the equivalent diameter D is greater than or equal to 1 / 3 and less than or equal to 2 / 3.

[0033] Specifically, in this embodiment, the first bent portion 61 extends into the second tube 2, and the maximum length of the tube portion of the first bent portion 61 extending into the second tube 2 is H. The second tube 2 in this embodiment is a round tube, and the equivalent diameter of the second tube 2 is D. The ratio of the maximum length H to the equivalent diameter D may be any value within a range of 1 / 3 to 2 / 3, such as 0.34, 0.38, 0.4, 0.45, 0.5, 0.55, 0.6, or 0.65. In actual operating conditions, if the ratio of the maximum length H to the equivalent diameter D is too small, the first bent portion 61 is likely to be located at the end face of the second tube 2, preventing liquid refrigerant from entering. This reduces the amount of liquid refrigerant drawn into the first passage (second heat exchange tube) 63, affecting heat exchange efficiency. If the ratio of the maximum length H to the equivalent diameter D is too large, the length of the tube portion of the first bent portion 61 located inside the second tube 2 is long, increasing flow resistance and affecting heat exchange efficiency. Therefore, unless the ratio of the maximum length H to the equivalent diameter D is within an appropriate range, a good heat exchange effect of the heat exchanger cannot be guaranteed. The design of this embodiment, in which the ratio of the maximum length H to the equivalent diameter D is between 1 / 3 and 2 / 3, is a better design parameter obtained through multiple tests, and ensures a good heat exchange effect of the heat exchanger.

[0034] In some embodiments, as shown in FIG. 3, there are multiple first passages, with the multiple first passages spaced apart across the width of the heat exchange tube, and / or there are multiple second passages, with the multiple second passages spaced apart across the width of the heat exchange tube.

[0035] Specifically, both the first and second heat exchange tubes are flat tubes, and Fig. 3 can be considered to be cross sections of the first and second heat exchange tubes. A plurality of first passages and a plurality of second passages are provided within each of the first and second heat exchange tubes, and the plurality of first passages and the plurality of second passages are spaced apart in the width direction of the heat exchange tube (the left-right direction in Fig. 3), with the plurality of first passages located to the left of the plurality of second passages. In some other embodiments, a plurality of first passages and a plurality of second passages may be provided within one of the first and second heat exchange tubes.

[0036] In some embodiments, as shown in FIG. 4 , the projection of the second passage of at least one first heat exchange tube 5 onto the first plane partially intersects with the projection of the first passage of at least one first bent portion 61 onto the first plane, and the angle b of the intersection is greater than 20° and less than 65°.

[0037] Specifically, in this embodiment, the extension direction of the second passage of the first heat exchange tube 5 projected onto the first plane coincides with the longitudinal direction of the first heat exchange tube 5, the extension direction of the first passage of the first bent portion 61 projected onto the first plane coincides with the longitudinal direction of the first bent portion 61, and angle b can be regarded as the angle between the longitudinal direction of the first heat exchange tube 5 and the longitudinal direction of the first bent portion 61. The angle b in this embodiment may be any value within the range of 20° to 65°, such as 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, 60°, or 65°. In actual operation, if angle b is large, the bending between first bent portion 61 and first straight portion 62 becomes more difficult, further increasing the difficulty of manufacturing the heat exchanger and increasing manufacturing costs. If angle b is small, interference occurs between the first and second pipes, resulting in heat conduction to the second pipe during operation of the first pipe, or heat conduction to the first pipe during operation of the second pipe, affecting heat exchange performance. Therefore, the value of angle b should be maintained within an appropriate range. In this embodiment, angle b is greater than 20° and less than 65°, which is advantageous for further improving heat exchange efficiency.

[0038] In some embodiments, as shown in FIG. 5 , a first sub-pipe 7 is provided within the first pipe 1, the first sub-pipe 7 including a flow path and a pipe wall surrounding the flow path, the longitudinal direction of the flow path being parallel to the longitudinal direction of the first pipe 1, the pipe wall being provided with a first through-hole 71 penetrating the pipe wall in its thickness direction, the first through-hole 71 connecting the first pipe 1 and the first sub-pipe 7; a second sub-pipe 8 is provided within the second pipe 2, the second sub-pipe 8 including a flow path and a pipe wall surrounding the flow path, the longitudinal direction of the flow path being parallel to the longitudinal direction of the second pipe 2, the pipe wall being provided with a second through-hole 81 penetrating the pipe wall in its thickness direction, the second through-hole 81 The flow paths of the second tube 2 and the second secondary tube 8 are connected, and there are a plurality of first through holes 71 and second through holes 81, the plurality of first through holes 71 being spaced apart in the longitudinal direction of the first tube 1, and the plurality of second through holes 81 being spaced apart in the longitudinal direction of the second tube 2, and in a first plane, the number of projections of the first through holes 71 toward the first passage of the first heat exchange tube 5 is greater than the number of projections of the first through holes 71 toward the second passage of the first heat exchange tube 5, and / or the number of projections of the second through holes 81 toward the first passage of the first bent portion 61 is greater than the number of projections of the second through holes 81 toward the second passage of the first bent portion 61.

[0039] Specifically, in some embodiments, a first secondary pipe 7 is provided within the first pipe 1, the first secondary pipe 7 including a pipe wall and a flow channel, and the flow channel of the first secondary pipe 7 is formed within the pipe wall. In this embodiment, the longitudinal direction of the first secondary pipe 7 is parallel to the longitudinal direction of the first pipe 1, i.e., the first secondary pipe 7 and the first pipe 1 both extend in a direction perpendicular to the page in FIG. 5 . In this embodiment, a second secondary pipe 8 is provided within the second pipe 2, the second secondary pipe 8 including a pipe wall and a flow channel, and the flow channel of the second secondary pipe 8 is formed within the pipe wall. The longitudinal direction of the second secondary pipe 8 is parallel to the longitudinal direction of the second pipe 2, i.e., the second secondary pipe 8 and the second pipe 2 both extend in a direction perpendicular to the page in FIG. 5 .

[0040] As shown in Fig. 5, first through holes 71 are provided in the pipe wall of the first secondary pipe 7 of this embodiment, and the first through holes 71 connect the flow paths of the first pipe 1 and the first secondary pipe 7, allowing the refrigerant in the first secondary pipe 7 to flow into the first pipe 1. The first through holes 71 of this embodiment are arranged in multiple rows and multiple columns, with each first through hole 71 in the same row being spaced apart in the longitudinal direction of the first secondary pipe 7 and each first through hole 71 in the same column being spaced apart in the circumferential direction of the first secondary pipe 7. The pipe wall of the first secondary pipe 7 of this embodiment can be divided into a left pipe wall and a right pipe wall on both sides of the diameter of the first secondary pipe 7 parallel to the longitudinal direction of the first heat exchange tube 5, and as shown in Fig. 5, the left pipe wall of this embodiment faces the first passage (first heat exchange tube) 51 side, and the right pipe wall faces the second passage (first heat exchange tube) 52 side. A plurality of first through holes 71 in the same row are located in the left pipe wall and the right pipe wall, respectively, and the number of first through holes 71 located in the left pipe wall in the same row is greater than the number of first through holes 71 located in the right pipe wall.

[0041] Similarly, in some embodiments, second through holes 81 are provided in the pipe wall of the second secondary pipe 8, and the second through holes 81 connect the flow paths of the second pipe 2 and the second secondary pipe 8, allowing the refrigerant in the second secondary pipe 8 to flow into the second pipe 2. The second through holes 81 in these embodiments are arranged in multiple rows and multiple columns, and each second through hole 81 in the same row is arranged at intervals in the longitudinal direction of the second secondary pipe 8, and each second through hole 81 in the same embodiment is arranged at intervals in the circumferential direction of the second secondary pipe 8. The pipe wall of the second secondary pipe 8 in this embodiment can be divided into a lower pipe wall and an upper pipe wall on both sides of the diameter of the second secondary pipe 8 parallel to the longitudinal direction of the first bent portion 61, and as shown in FIG. 5 , the lower pipe wall faces the first passage (second heat exchange pipe) 63 side, and the upper pipe wall faces the second passage (second heat exchange pipe) 64 side. In the same example, the multiple second through holes 81 are located on the lower pipe wall and the upper pipe wall, respectively, and the number of second through holes 81 located on the lower pipe wall in the same row is greater than the number of second through holes 81 located on the upper pipe wall.

[0042] The different arrangement of the number of first through-holes 71 in the left pipe wall of the first secondary pipe 7 and the number of first through-holes 71 in the right pipe wall allows more of the liquid-phase refrigerant flowing out through the first secondary pipe 7 to flow to the side closer to the first passage (first heat exchange pipe) 51, thereby further improving the heat exchange efficiency. Similarly, the different arrangement of the number of second through-holes 81 in the upper pipe wall of the second secondary pipe 8 and the number of second through-holes 81 in the lower pipe wall allows more of the liquid-phase refrigerant flowing out through the second secondary pipe 8 to flow to the side closer to the first passage (second heat exchange pipe) 63, thereby further improving the heat exchange efficiency.

[0043] In some embodiments, as shown in FIG. 6 , a first plate 9 is provided within the second tube 2, and the first plate 9 divides the flow path of the second tube 2 into a first flow path 21 and a second flow path 22. A portion of the tube of the first bent portion 61 is located within the first flow path 21 and communicates with the first flow path 21. The first plate 9 includes a portion of an inclined surface, and when the heat exchanger is operating, the inclined surface guides more refrigerant to flow into the first passage of the first bent portion 61.

[0044] Specifically, the first plate 9 is disposed within the second tube 2, and extends in the longitudinal direction of the second tube 2 (i.e., perpendicular to the page in FIG. 6 ). The first plate 9 divides the flow path of the second tube 2 into a first flow path 21 and a second flow path 22, which are relatively independent. The first bent portion 61 of the second heat exchange tube 6 extends into one of the first flow path 21 and the second flow path 22, the first flow path 21 being located above the second flow path 22, and the first bent portion 61 extends into the first flow path 21. The first plate 9 is disposed at an incline, and the side of the first plate 9 facing the first bent portion 61 forms a partial inclined surface. When the refrigerant flows along the first flow path 21, the liquid-phase refrigerant flows downward along the partial inclined surface of the first plate 9. In other words, the liquid-phase refrigerant collects on the side closer to the first passage (second heat exchange tube) 63, which is advantageous for improving heat exchange efficiency. By configuring the first plate 9 in this embodiment, the flow path in the second tube 2 is divided into independent first flow path 21 and second flow path 22, and during operation of the heat exchanger, the refrigerant flows only along the first flow path 21, which serves to reduce the flow space supplying the refrigerant in the second tube 2 and increase the height of the refrigerant, thereby allowing more refrigerant to enter the first passage (second heat exchange tube) 63, and the proportion of liquid phase components is relatively high, which is advantageous for further improving the heat exchange efficiency.

[0045] In some embodiments, as shown in FIG. 7 , the first plate 9 includes a first surface 91 facing the first bent portion 61 and a second surface 92 facing away from the first bent portion 61, at least a portion of the first surface 91 being an inclined surface, and in the first plane, the projection line of the first plate 9 is inclined with respect to the width direction of the first heat exchange tube 5, and the minimum distance from the projection of the end surface of the first passage of the first bent portion 61 located in the second tube 2 to the first surface 91 is L1, and the minimum distance from the projection of the end surface of the second passage of the first bent portion 61 located in the second tube 2 to the first surface 91 is L2, and the distance L1 is smaller than the distance L2.

[0046] Specifically, a first plate 9 is disposed within the second tube 2, facing the first bent portion 61. The first plate 9 has a first surface 91 and a second surface 92. In this embodiment, the first surface 91 faces the first bent portion 61, and the second surface 92 faces away from the first bent portion 61. The first plane can be regarded as the plane of FIG. 7, and the projection of the first plate 9 onto the first plane forms an angle with the width direction of the first heat exchange tube 5. Within the first plane, the minimum distance between the projection of the end face of the first passage within the first bent portion 61 and the first surface 91 is L1, and the minimum distance between the projection of the end face of the second passage within the first bent portion 61 and the first surface 91 is L2. In this embodiment, the minimum distance L1 is smaller than the minimum distance L2. This dimensional design allows more refrigerant to collect at the bottom of the first flow passage 21, which is advantageous for improving heat exchange efficiency.

[0047] In some embodiments, as shown in FIG. 8 , the first plate 9 includes a first surface 91 facing toward the first bent portion 61 and a second surface 92 facing away from the first bent portion 61, the first surface 91 including two intersecting inclined surfaces, and within a first plane, the projection lines of the two inclined surfaces of the first surface 91 include at least two intersecting line segments, the distance from the intersection of the two line segments to the projection of the end surface of the first bent portion 61 located within the second tube 2 is L3, the minimum distance from the projection of the end surface of the first passage of the first bent portion 61 located within the second tube 2 to the first surface 91 is L1, and the minimum distance from the projection of the end surface of the second passage of the first bent portion 61 located within the second tube 2 to the first surface 91 is L2, and L3 is smaller than L1 and / or L3 is smaller than L2.

[0048] Specifically, in this embodiment, the first plate 9 is disposed within the second pipe 2, and has a first surface 91 and a second surface 92, with the first surface 91 facing the first bent portion 61 and the second surface 92 facing away from the second bent portion 65. In this embodiment, the first surface 91 includes two intersecting inclined surfaces, which are a first inclined surface 911 and a second inclined surface 912. The first plane in this embodiment is the page of FIG. 8, and the projections of the first inclined surface 911 and the second inclined surface 912 onto the first plane are two line segments, which have a common endpoint and are formed as the intersection of the two line segments. In this embodiment, the end face of the first bent portion 61 is perpendicular to the first plane, and the projection of the end face of the first bent portion 61 onto the first plane is a projected line segment. The distance between this projected line segment and the common end point of the two line segments is L3. The projection of the end face of the first passage within the first bent portion 61 onto the first plane can be considered to be one point on the projected line segment. The distance between this point and the first inclined surface 911 is L1. The projection of the end face of the second passage within the first bent portion 61 onto the first plane can be considered to be another point on the projected line segment. The distance between this point and the second inclined surface 912 is L2. In this embodiment, the distance L3 is shorter than the distance L1, and the distance L3 is also shorter than the distance L2. This design narrows the width of the first flow passage 21 near the first passage (second heat exchange tube) 63, which is advantageous for more refrigerant to enter the first passage (second heat exchange tube) 63. In other embodiments, the distance L3 may be smaller than either the distance L1 or the distance L2.

[0049] In some embodiments, as shown in FIG. 8 , the second secondary pipe 8 is disposed within the second flow path 22 of the second pipe 2, and the first plate 9 includes a third through hole 93 penetrating the first plate 9 in its thickness direction, and the third through hole 93 connects the first flow path 21 with the flow path of the second secondary pipe 8. Specifically, a first plate 9 is provided within the second pipe 2, and the first plate 9 divides the flow path of the second pipe 2 into a first flow path 21 and a second flow path 22. The second secondary pipe 8 in this embodiment is provided within the second flow path 22, and the second secondary pipe 8 is formed integrally with the first plate 9. That is, a portion of the pipe wall of the second secondary pipe 8 can be considered as part of the first plate 9. A third through-hole 93 is provided in this portion of the first plate 9. The third through-hole 93 connects the first flow path 21 and the flow path of the second secondary pipe 8, allowing the refrigerant in the second secondary pipe 8 to flow directly into the first flow path 21. With this design, the second secondary pipe 8 does not occupy space within the first flow path 21, which is advantageous for reducing flow resistance.

[0050] In some embodiments, as shown in Figures 2 and 9, at least a portion of the first heat exchange tube 5 is located within the first tube 1, and in a first plane, the projection of the end face of the first heat exchange tube 5 located within the first tube 1 forms an angle with the projection of the cross section of the first heat exchange tube 5, and the length of the first passage located within the first tube 1 is greater than the length of the second passage located within the first tube 1, and / or, in a first plane, the projection of the end face of the first bent portion 61 located within the second tube 2 forms an angle with the projection of the cross section of the second heat exchange tube 6, and the length of the first passage located within the second tube 2 is greater than the length of the second passage located within the second tube 2.

[0051] Specifically, the first heat exchange tube 5 extends within the first tube 1, and the first plane can be regarded as the page of Figure 9. The projection of the end face of the first heat exchange tube 5 located within the first tube 1 onto the first plane is an inclined line segment, and the projection of the cross section of the first heat exchange tube 5 onto the first plane is a horizontal line segment, which forms an angle with the inclined line segment. The length of the first passage (first heat exchange tube) 51 located within the first tube 1 is M1, and the length of the second passage (first heat exchange tube) 52 located within the first tube 1 is M2, with length M1 being longer than length M2. This design increases the opportunity for the end face of the first passage (first heat exchange tube) 51 to come into contact with the liquid refrigerant, allowing more refrigerant to enter the first passage, which is beneficial to improving heat exchange efficiency.

[0052] Similarly, in this embodiment, the projection of the end face of the first bent portion 61 onto the first plane and the projection of the cross section of the first bent portion 61 onto the first plane are both inclined line segments, and the two inclined line segments form an angle. The length of the first passage (second heat exchange tube) 63 located within the second tube 2 is M3, and the length of the second passage (second heat exchange tube) 64 located within the second tube 2 is M4, where length M3 is longer than length M4. This design allows the end face of the first passage (second heat exchange tube) 63 to be immersed in the liquid refrigerant, which is advantageous for sufficient suction of the liquid refrigerant and improves heat exchange efficiency.

[0053] In some embodiments, as shown in FIG. 10 , the tube portion of the first heat exchange tube 5 extending to the first tube 1 includes a first step portion 53, the dimension of the first step portion 53 in the width direction of the first heat exchange tube 5 is smaller than the width of the first heat exchange tube 5, the projection of the end face of the first passage of the first heat exchange tube 5 and the projection of the first step portion 53 overlap in the first plane, and the width of the first step portion 53 is smaller than 1 / 2 of the width of the first heat exchange tube 5.

[0054] Specifically, a first step 53 is provided at one end of the first heat exchange tube 5, and the first step 53 is provided within the first tube 1. The first plane in this embodiment can be regarded as the page of FIG. 10. Within the first plane, the projection of the end face of the first passage (first heat exchange tube) 51 and the projection of the first step 53 overlap. In the width direction of the first heat exchange tube 5, the width dimension of the first heat exchange tube 5 is W, and the width dimension of the first step 53 is W1. The width dimension W1 is less than half the width dimension W, i.e., the ratio of the width dimension W1 to the width dimension W does not exceed 0.5, and may be, for example, 0.1, 0.2, 0.3, 0.4, or 0.5. The design of the first step 53 allows the end face of the first passage (first heat exchange tube) 51 to be immersed in the liquid-phase refrigerant, allowing more liquid-phase refrigerant to enter the first passage, which is beneficial to improving heat exchange efficiency.

[0055] Hereinafter, heat exchangers according to specific embodiments of the present disclosure will be described with reference to the drawings.

[0056] 1 and 2, a heat exchanger according to an embodiment of the present disclosure includes a first assembly, a second assembly, a plurality of heat exchange tubes, and fins, with the first assembly including a first tube 1 and a second tube 2, and the second assembly including a third tube 3 and a fourth tube 4. The second assembly is located above the first assembly, and in this embodiment, the third tube 3 is located directly above the first tube 1, and the fourth tube 4 is located directly above the second tube 2. The first tube 1, the second tube 2, the third tube 3, and the fourth tube 4 are all arranged to extend in the front-to-rear direction (the direction perpendicular to the page in FIG. 2).

[0057] As shown in FIG. 3 , the heat exchange tube is a flat tube with multiple passages. The passages within the heat exchange tube can be divided into first and second passages based on the cross-sectional area. Within the same heat exchange tube, the first passages have the largest cross-sectional area, and the second passages have the smallest cross-sectional area. The first passages are located on the left side of the heat exchange tube, and the second passages are located on the right side of the heat exchange tube. Between the first and second passages, multiple third passages, multiple fourth passages, etc. are further provided. The cross-sectional areas of the third and fourth passages, etc., located between the first and second passages, are between the cross-sectional areas of the first and second passages. In some embodiments, the passages within the heat exchange tube are arranged from left to right based on the cross-sectional area. In some other embodiments, as shown in FIG. 3 , the passages in the heat exchange tube are divided into multiple sets according to the size of the flow cross-sectional area, and each set has one or more passages, and the passages in each set are arranged from left to right according to the size of the flow cross-sectional area.

[0058] As shown in Figure 1, the heat exchange tubes can be divided into a first heat exchange tube 5 and a second heat exchange tube 6, which are arranged with a gap between them in the front-to-rear direction. The first heat exchange tube 5 is a flat tube and is arranged to extend in the vertical direction, with the top end of the first heat exchange tube 5 communicating with the first tube 1 and the bottom end of the first heat exchange tube 5 communicating with the third tube 3. When the heat exchanger is operating, the refrigerant flows through the first tube 1, the first heat exchange tube 5, and the third tube 3 in that order.

[0059] As shown in FIG. 2 , the second heat exchange tube 6 includes a first bent portion 61, a second bent portion 65, and a first straight portion 62, the first straight portion 62 being parallel to the first heat exchange tube 5, one end of the first bent portion 61 communicating with one end of the first straight portion 62, the other end of the first bent portion 61 communicating with the third tube 3, the other end of the first straight portion 62 communicating with the second bent portion 65, and the other end of the second bent portion 65 communicating with the fourth tube 4; that is, the first bent portion 61 is located between the first straight portion 62 and the third tube 3, and the second bent portion 65 is located between the first straight portion 62 and the fourth tube 4. In this embodiment, the longitudinal direction of a portion of the tubular portion of the first bent portion 61 (from upper left to lower right in Figure 2) forms an obtuse angle with the longitudinal direction of the first straight portion 62 (up and down direction in Figure 2), and the longitudinal direction of a portion of the tubular portion of the second bent portion 65 (from lower left to upper right in Figure 2) forms an obtuse angle with the longitudinal direction of the first straight portion 62 (up and down direction in Figure 2).

[0060] The fins are provided between the first heat exchange tube 5 and the second heat exchange tube 6, and include a plurality of first fins 10, one side of each first fin 10 being connected to the first heat exchange tube 5 and the other side being connected to the second heat exchange tube 6. The plurality of first fins 10 are arranged at intervals in the front-to-rear direction.

[0061] In some embodiments, the first passage (first heat exchange tube) 51 is located on the left side of the first heat exchange tube 5, the second passage (first heat exchange tube) 52 is located on the right side of the second heat exchange tube 6, the first passage (second heat exchange tube) 63 is located on the left side of the first bend portion 61, and the second passage (second heat exchange tube) 64 is located on the right side of the first bend portion 61. The page of FIG. 2 is defined as a first plane, and within the first heat exchange tube 5 and the second heat exchange tube 6, the projections of at least one first passage (first heat exchange tube) 51 onto the first plane, the projections of at least one second passage (first heat exchange tube) 52 onto the first plane, the projections of at least one first passage (second heat exchange tube) 63 onto the first plane, and the projections of at least one second passage (second heat exchange tube) 64 onto the first plane are sequentially arranged in a left-to-right direction.

[0062] In some other embodiments, as shown in FIG. 15 , the first passage (first heat exchange tube) 51 may be located on the right side of the first heat exchange tube 5, and the second passage (first heat exchange tube) 52 may be located on the left side of the second heat exchange tube 6, or the first passage (second heat exchange tube) 63 may be located on the right side of the first bent portion 61, and the second passage (second heat exchange tube) 64 may be located on the left side of the first bent portion 61. The page of FIG. 15 is defined as a first plane, and within the first heat exchange tube 5 and the second heat exchange tube 6, the projections of at least one first passage (second heat exchange tube) 63 onto the first plane, the projections of at least one second passage (second heat exchange tube) 64 onto the first plane, the projections of at least one first passage (first heat exchange tube) 51 onto the first plane, and the projections of at least one second passage (first heat exchange tube) 52 onto the first plane are sequentially arranged from right to left.

[0063] 4, the first bent portion 61 extends into the second pipe 2, the maximum length of the pipe portion of the first bent portion 61 extending into the second pipe 2 is H, the second pipe 2 in this embodiment is a round pipe, and the equivalent diameter of the second pipe 2 is D. The ratio of the maximum length H to the equivalent diameter D may be 1 / 3.

[0064] As shown in FIG. 4 , the extension direction of the second passage of the first heat exchange tube 5 projected onto the first plane coincides with the longitudinal direction of the first heat exchange tube 5, the extension direction of the first passage of the first bent portion 61 projected onto the first plane coincides with the longitudinal direction of the first bent portion 61, and an angle b is formed between the longitudinal direction of the first heat exchange tube 5 and the longitudinal direction of the first bent portion 61, and the angle b may be 30°.

[0065] In some embodiments, a first secondary tube 7 is provided within the first tube 1 of the heat exchanger, and a second secondary tube 8 is provided within the second tube 2, as shown in FIG.

[0066] As shown in Fig. 5, first through holes 71 are provided in the pipe wall of the first secondary pipe 7, and the first through holes 71 connect the flow paths of the first pipe 1 and the first secondary pipe 7, allowing the refrigerant in the first secondary pipe 7 to flow into the first pipe 1. The first through holes 71 are arranged in multiple rows and multiple columns, and each first through hole 71 in the same row is arranged at intervals in the longitudinal direction of the first secondary pipe 7 (the direction perpendicular to the page of Fig. 5), and each first through hole 71 in the same column is arranged at intervals in the circumferential direction of the first secondary pipe 7. In this embodiment, the pipe wall of the first secondary pipe 7 can be divided into a left pipe wall and a right pipe wall on both sides of the diameter of the first secondary pipe 7 parallel to the longitudinal direction of the first heat exchange tube 5, and as shown in Fig. 5, the left pipe wall faces the first passage (first heat exchange tube) 51 side, and the right pipe wall faces the second passage (first heat exchange tube) 52 side. A plurality of first through holes 71 in the same row are located in the left pipe wall and the right pipe wall, respectively, and the number of first through holes 71 located in the left pipe wall in the same row is greater than the number of first through holes 71 located in the right pipe wall.

[0067] In some embodiments, second through holes 81 are provided in the pipe wall of the second secondary pipe 8, and the second through holes 81 connect the flow paths of the second pipe 2 and the second secondary pipe 8, allowing the refrigerant in the second secondary pipe 8 to flow into the second pipe 2. The second through holes 81 are arranged in multiple rows and multiple columns, and each second through hole 81 in the same row is arranged at intervals in the longitudinal direction of the second secondary pipe 8 (the direction perpendicular to the page of FIG. 5 ), and in some embodiments, each second through hole 81 is arranged at intervals in the circumferential direction of the second secondary pipe 8. The pipe wall of the second secondary pipe 8 can be divided into a lower pipe wall and an upper pipe wall on both sides of the diameter of the second secondary pipe 8 parallel to the longitudinal direction of the first bent portion 61, and as shown in FIG. 5 , the lower pipe wall faces the first passage (second heat exchange pipe) 63 side, and the upper pipe wall faces the second passage (second heat exchange pipe) 64 side. In the same example, the multiple second through holes 81 are located on the lower pipe wall and the upper pipe wall, respectively, and the number of second through holes 81 located on the lower pipe wall in the same row is greater than the number of second through holes 81 located on the upper pipe wall.

[0068] In some embodiments, a first plate 9 and a second sub-tube 8 are provided within the second tube 2 of the heat exchanger embodiments of the present disclosure, as shown in FIG.

[0069] 8 , the first plate 9 divides the flow path of the second pipe 2 into a first flow path 21 and a second flow path 22, the first plate 9 is disposed at a distance from the end face of the first bent portion 61, the first flow path 21 is located above the second flow path 22, the first bent portion 61 extends into the first flow path 21, and the second secondary pipe 8 is provided in the second flow path 22. In this embodiment, the first plate 9 and the second secondary pipe 8 are integrally formed, that is, a portion of the pipe wall of the second secondary pipe 8 can be considered as part of the first plate 9, and a third through hole 93 is provided in this portion of the first plate 9, and the third through hole 93 connects the first flow path 21 and the flow path of the second secondary pipe 8.

[0070] In some embodiments, as shown in FIG. 9, the end face located within the first tube 1 of the first heat exchange tube 5 of the heat exchanger is an inclined surface, and the end face located within the second tube 2 of the first guide portion is an inclined surface.

[0071] 9, the length of the first passage (first heat exchange tube) 51 located within the first tube 1 is M1, and the length of the second passage (first heat exchange tube) 52 located within the first tube 1 is M2, with length M1 being longer than length M2. The length of the first passage (second heat exchange tube) 63 located within the second tube 2 is M3, and the length of the second passage (second heat exchange tube) 64 located within the second tube 2 is M4, with length M3 being longer than length M4.

[0072] In some embodiments, as shown in FIG. 10 , the first heat exchange tube 5 of the heat exchanger has a first step 53 at the end located within the first tube 1, and a second step 61 at the end located within the second tube 2.

[0073] 10 is taken as a first plane, and within the first plane, a projection of the end face of the first passage (first heat exchange tube) 51 and a projection of the first step portion 53 overlap, i.e., the first step portion 53 is provided on the left side of the end of the first heat exchange tube 5. Within the first plane, a projection of the end face of the first passage (second heat exchange tube) 63 and a projection of the second step portion overlap, i.e., the second step portion is provided below the end of the first bent portion 61.

[0074] The ratio of the width of the first step portion 53 to the width of the first heat exchange tube 5 is 1 / 3, and the ratio of the width of the second step portion to the width of the first bent portion 61 is 1 / 3.

[0075] In some other embodiments, a first plate 9 and a second secondary tube 8 are provided in the second tube 2 of the heat exchanger, as shown in FIG.

[0076] The first plate 9 divides the flow path of the second pipe 2 into a first flow path 21 and a second flow path 22, the first flow path 21 being located above the second flow path 22, and the first bent portion 61 extending into the first flow path 21. In this embodiment, the second secondary pipe 8 is provided within the first flow path 21, the second secondary pipe 8 being spaced apart from the first plate 9, and the longitudinal direction of the second secondary pipe 8 being parallel to the longitudinal direction of the second pipe 2. The second secondary pipe 8 includes a pipe wall, and a second through hole 81 is provided in the pipe wall of the second secondary pipe 8.

[0077] 12, the heat exchanger includes a first assembly, a second assembly, a plurality of heat exchange tubes, and fins, the first assembly including a first tube 1 and a second tube 2, and the second assembly including a third tube 3 and a fourth tube 4. The first assembly, the second assembly, the plurality of heat exchange tubes, and the fins may be the same as those in the above-mentioned embodiments, and the description thereof will be omitted here. The present embodiment differs in that a first plate 9 and a second sub-tube 8 are provided within the second tube 2.

[0078] The first plate 9 divides the flow path of the second pipe 2 into a first flow path 21 and a second flow path 22, with the first flow path 21 located above the second flow path 22 and the first bent portion 61 extending into the first flow path 21. In this embodiment, the second secondary pipe 8 is provided within the second flow path 22 and is formed integrally with the first plate 9, i.e., a portion of the pipe wall of the second secondary pipe 8 can be considered as part of the first plate 9. In this embodiment, the cross section of the second secondary pipe 8 is semicircular.

[0079] In some embodiments, the heat exchanger may include a first plate 9 and a second sub-tube 8 within the second tube 2, as shown in FIG.

[0080] The first plate 9 divides the flow path of the second pipe 2 into a first flow path 21 and a second flow path 22, the first flow path 21 being located above the second flow path 22, and the first bent portion 61 extending into the first flow path 21. In this embodiment, the second secondary pipe 8 is formed integrally with the first plate 9, and the first plate 9 has a first surface 91 facing the first bent portion 61 and a second surface 92 facing away from the first bent portion 61. The first secondary pipe 7 is provided in the center of the first plate 9, and one side of the first secondary pipe 7 protrudes from the first surface 91, and the other side of the first secondary pipe 7 protrudes from the second surface 92. In this embodiment, the second secondary pipe 8 is a round pipe.

[0081] In some other embodiments, as shown in Figure 14, a first secondary tube 7 is provided within the first tube 1 of the heat exchanger, and a second secondary tube 8 is provided within the second tube 2. Both the first tube 1 and the second tube 2 are provided with a first plate 9.

[0082] The first plate 9 in the second pipe 2 divides the flow path of the second pipe 2 into a first flow path 21 and a second flow path 22, the first flow path 21 being located above the second flow path 22, and the first bent portion 61 extending into the first flow path 21. In this embodiment, the second secondary pipe 8 is integrally formed with the first plate 9 in the second pipe 2, and the first plate 9 in the second pipe 2 has a first surface 91 facing the first bent portion 61 and a second surface 92 facing away from the first bent portion 61, the second secondary pipe 8 being provided in the center of the first plate 9 in the second pipe 2, one side of the second secondary pipe 8 protruding from the first surface 91 and the other side of the second secondary pipe 8 protruding from the second surface 92. In this embodiment, the second secondary pipe 8 is a round pipe.

[0083] The first plate 9 in the first tube 1 divides the flow path of the first tube 1 into a third flow path 11 and a fourth flow path 12, with the third flow path 11 located above the fourth flow path 12 and the bottom of the first heat exchange tube extending into the third flow path 11. In this embodiment, the first secondary tube 7 is integrally formed with the first plate 9 in the first tube 1, and the first plate 9 in the first tube 1 has a third surface facing the first heat exchange tube and a fourth surface facing away from the first heat exchange tube, and the first secondary tube 7 is provided in the center of the first plate 9 in the first tube 1, with one side of the first secondary tube 7 protruding from the third surface and the other side of the first secondary tube 7 protruding from the fourth surface. In this embodiment, the first secondary tube 7 is a round tube.

[0084] In describing the present disclosure, the orientations or positional relationships indicated by terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" are orientations or positional relationships shown based on the drawings, and are intended merely to explain and simplify the disclosure, and are not intended to indicate or imply that the depicted devices or elements necessarily have a particular orientation or are constructed and operated in a particular orientation, and therefore should not be understood as limitations on the present disclosure.

[0085] Additionally, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance and as implicitly indicating the number of technical features depicted. Accordingly, a feature qualified as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this disclosure, "plurality" means at least two, e.g., two, three, etc., unless otherwise specifically and explicitly limited.

[0086] In this disclosure, unless otherwise clearly specified and limited, the terms "attached," "coupled," "connected," "fixed," etc. should be understood in a broad sense, and may refer to, for example, a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, an internal communication between two elements, or an interactive relationship between two elements. Those skilled in the art can understand the specific meanings of the above terms in this disclosure according to specific circumstances.

[0087] In this disclosure, unless otherwise expressly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact via an intermediate medium. Furthermore, a first feature being "above," "above," and "on top of" a second feature may simply indicate that the first feature is directly above or diagonally above the second feature, or that the horizontal height of the first feature is higher than that of the second feature. A first feature being "below," "below," or "below" a second feature may simply indicate that the first feature is directly below or diagonally below the second feature, or that the horizontal height of the first feature is lower than that of the second feature.

[0088] In the description herein, a description that refers to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present disclosure. In the description herein, general descriptions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or advantages described may be combined in any appropriate manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine or combine different embodiments or examples described herein and features of different embodiments or examples, as long as they do not conflict with each other.

[0089] Although the embodiments of the present disclosure have been shown and described above, it should be noted that the above embodiments are merely illustrative and should not be construed as limitations on the present disclosure, and those skilled in the art may change, modify, substitute, and alter the above embodiments within the scope of the present disclosure.

Claims

1. 1. A heat exchanger comprising: a first assembly including a first tube and a second tube; a second assembly including a third tube and a fourth tube; a plurality of heat exchange tubes, each having a substantially flattened outer peripheral contour in cross section, each heat exchange tube including a plurality of passages arranged in a longitudinal direction of the heat exchange tube, the plurality of passages being spaced apart in a width direction of the heat exchange tube, the plurality of passages including first passages and second passages, a cross-sectional flow area of ​​the first passage in the cross section of the heat exchange tube being larger than the cross-sectional flow areas of the other passages in the cross section of the heat exchange tube, and a cross-sectional flow area of ​​the second passage in the cross section of the heat exchange tube being smaller than the cross-sectional flow areas of the other passages in the cross section of the heat exchange tube; the heat exchange tubes include a first heat exchange tube and a second heat exchange tube, one end of the first heat exchange tube in the longitudinal direction communicates with the first tube and the other end of the first heat exchange tube in the longitudinal direction communicates with the third tube so as to communicate with the first tube and the third tube; a plurality of heat exchange tubes, the second heat exchange tube communicating with the second tube and the fourth tube, the second heat exchange tube including a first bent portion and a first straight portion, one end of the first bent portion communicating with the second tube and the other end of the first bent portion communicating with one end of the first straight portion, the first heat exchange tube and the second heat exchange tube being spaced apart in the longitudinal direction of the first tube; fins including first fins, wherein at least some of the first fins are connected to one of the first heat exchange tubes in the longitudinal direction of the first tube, and at least some of the first fins are connected to one of the second heat exchange tubes, the first heat exchange tubes, the first fins, and the second heat exchange tubes are sequentially arranged in the longitudinal direction of the first tube, and the number of the first fins is two or more; a plane perpendicular to the longitudinal direction of the first tubes and parallel to the width and longitudinal directions of the first heat exchange tubes is defined as a first plane, and within the first plane, an angle is formed between the longitudinal direction of a projection of a portion of the tube portion of the first bent portion of one of the second heat exchange tubes and the longitudinal direction of a projection of the first straight portion of the second heat exchange tube, and in the width direction of the first heat exchange tube, a projection of a second passage of at least one of the first heat exchange tubes is located between the projection of the first passage of the first heat exchange tube and the projection of the first passage of a portion of the first bent portion, and a projection of a first passage of at least one of the first bent portions is located between the projection of the second passage of the first heat exchange tube and the projection of the second passage of a portion of the first bent portion, a first secondary pipe is provided within the first pipe, and a first plate and a second secondary pipe are provided within the second pipe, the first plate divides a flow path of the second pipe into a first flow path and a second flow path, a part of the pipe portion of the first bent portion is located within the first flow path and communicates with the first flow path, the first plate includes a part of an inclined surface, and during operation of the heat exchanger, the inclined surface guides more refrigerant to flow into a first passage of the first bent portion, the second secondary pipe is provided in the second flow path of the second pipe, and the first plate includes a third through-hole penetrating the first plate in a thickness direction, and the third through-hole connects the first flow path and the flow path of the second secondary pipe; A heat exchanger characterized by:

2. At least a portion of the first bent portion of the second heat exchange tube is provided within the second tube, the maximum length of the tube portion of the first bent portion provided within the second tube is H, the equivalent diameter of the second tube is D, and the ratio of the maximum length H to the equivalent diameter D is 1 / 3 or more and 2 / 3 or less.

2. The heat exchanger according to claim 1.

3. the first passages are plural, and the first passages are spaced apart in the width direction of the heat exchange tube; and / or the second passages are plural, and the second passages are spaced apart in the width direction of the heat exchange tube.

2. The heat exchanger according to claim 1.

4. a projection of the second passage of at least one of the first heat exchange tubes onto the first plane partially intersects with a projection of the first passage of at least one of the first bent portions onto the first plane, and an angle b of the intersection is greater than 20° and less than 65°; 4. The heat exchanger according to claim 1, wherein the heat exchanger is a heat exchanger having a heat source.

5. The first sub-pipe includes a flow path and a pipe wall surrounding the flow path, the longitudinal direction of the flow path is parallel to the longitudinal direction of the first pipe, the pipe wall is provided with a first through-hole penetrating the pipe wall in the thickness direction, and the first through-hole connects the first pipe and the first sub-pipe, the second sub-pipe includes a flow path and a pipe wall surrounding the flow path, the longitudinal direction of the flow path is parallel to the longitudinal direction of the second pipe, the pipe wall is provided with a second through-hole penetrating the pipe wall in a thickness direction, the second through-hole communicating the second pipe with the flow path of the second sub-pipe, the first through holes and the second through holes are plural, the first through holes are arranged at intervals in the longitudinal direction of the first tube, the second through holes are arranged at intervals in the longitudinal direction of the second tube, and in the first plane, the number of projections of the first through holes toward the first passages of the first heat exchange tube is greater than the number of projections of the first through holes toward the second passages of the first heat exchange tube, and / or the number of projections of the second through holes toward the first passages of the first bent portion is greater than the number of projections of the second through holes toward the second passages of the first bent portion; 4. The heat exchanger according to claim 1, wherein the heat exchanger is a heat exchanger having a heat source.

6. A heat exchanger, a first assembly including a first tube and a second tube; a second assembly including a third tube and a fourth tube; a plurality of heat exchange tubes, each having a substantially flattened outer peripheral contour in cross section, each heat exchange tube including a plurality of passages arranged in a longitudinal direction of the heat exchange tube, the plurality of passages being spaced apart in a width direction of the heat exchange tube, the plurality of passages including first passages and second passages, a cross-sectional flow area of ​​the first passage in the cross section of the heat exchange tube being larger than the cross-sectional flow areas of the other passages in the cross section of the heat exchange tube, and a cross-sectional flow area of ​​the second passage in the cross section of the heat exchange tube being smaller than the cross-sectional flow areas of the other passages in the cross section of the heat exchange tube; the heat exchange tubes include a first heat exchange tube and a second heat exchange tube, one end of the first heat exchange tube in the longitudinal direction communicates with the first tube and the other end of the first heat exchange tube in the longitudinal direction communicates with the third tube so as to communicate with the first tube and the third tube; a plurality of heat exchange tubes, the second heat exchange tube communicating with the second tube and the fourth tube, the second heat exchange tube including a first bent portion and a first straight portion, one end of the first bent portion communicating with the second tube and the other end of the first bent portion communicating with one end of the first straight portion, the first heat exchange tube and the second heat exchange tube being spaced apart in the longitudinal direction of the first tube; fins including first fins, wherein at least some of the first fins are connected to one of the first heat exchange tubes in the longitudinal direction of the first tube, and at least some of the first fins are connected to one of the second heat exchange tubes, the first heat exchange tubes, the first fins, and the second heat exchange tubes are sequentially arranged in the longitudinal direction of the first tube, and the number of the first fins is two or more; a plane perpendicular to the longitudinal direction of the first tubes and parallel to the width and longitudinal directions of the first heat exchange tubes is defined as a first plane, and within the first plane, an angle is formed between the longitudinal direction of a projection of a portion of the tube portion of the first bent portion of one of the second heat exchange tubes and the longitudinal direction of a projection of the first straight portion of the second heat exchange tube, and in the width direction of the first heat exchange tube, a projection of a second passage of at least one of the first heat exchange tubes is located between the projection of the first passage of the first heat exchange tube and the projection of the first passage of a portion of the first bent portion, and a projection of a first passage of at least one of the first bent portions is located between the projection of the second passage of the first heat exchange tube and the projection of the second passage of a portion of the first bent portion, a first plate is provided within the second tube, the first plate dividing a flow path of the second tube into a first flow path and a second flow path, a part of the tube portion of the first bent portion being located within the first flow path and communicating with the first flow path, the first plate including a part of an inclined surface, the inclined surface guiding a larger amount of refrigerant to flow into the first passage of the first bent portion during operation of the heat exchanger, the first plate includes a first surface facing the first bent portion and a second surface facing away from the first bent portion, at least a part of the first surface being an inclined surface, a projection line of the first plate on the first plane being inclined with respect to a width direction of the first heat exchange tube, a minimum distance from a projection of an end surface of a first passage of the first bent portion located in a second tube to the first surface is L1, a minimum distance from a projection of an end surface of a second passage of the first bent portion located in a second tube to the first surface is L2, and the distance L1 is shorter than the distance L2; A heat exchanger characterized by:

7. A heat exchanger, a first assembly including a first tube and a second tube; a second assembly including a third tube and a fourth tube; a plurality of heat exchange tubes, each having a substantially flattened outer peripheral contour in cross section, each heat exchange tube including a plurality of passages arranged in a longitudinal direction of the heat exchange tube, the plurality of passages being spaced apart in a width direction of the heat exchange tube, the plurality of passages including first passages and second passages, a cross-sectional flow area of ​​the first passage in the cross section of the heat exchange tube being larger than the cross-sectional flow areas of the other passages in the cross section of the heat exchange tube, and a cross-sectional flow area of ​​the second passage in the cross section of the heat exchange tube being smaller than the cross-sectional flow areas of the other passages in the cross section of the heat exchange tube; the heat exchange tubes include a first heat exchange tube and a second heat exchange tube, one end of the first heat exchange tube in the longitudinal direction communicates with the first tube and the other end of the first heat exchange tube in the longitudinal direction communicates with the third tube so as to communicate with the first tube and the third tube; a plurality of heat exchange tubes, the second heat exchange tube communicating with the second tube and the fourth tube, the second heat exchange tube including a first bent portion and a first straight portion, one end of the first bent portion communicating with the second tube and the other end of the first bent portion communicating with one end of the first straight portion, the first heat exchange tube and the second heat exchange tube being spaced apart in the longitudinal direction of the first tube; fins including first fins, wherein at least some of the first fins are connected to one of the first heat exchange tubes in the longitudinal direction of the first tube, and at least some of the first fins are connected to one of the second heat exchange tubes, the first heat exchange tubes, the first fins, and the second heat exchange tubes are sequentially arranged in the longitudinal direction of the first tube, and the number of the first fins is two or more; a plane perpendicular to the longitudinal direction of the first tubes and parallel to the width and longitudinal directions of the first heat exchange tubes is defined as a first plane, and within the first plane, an angle is formed between the longitudinal direction of a projection of a portion of the tube portion of the first bent portion of one of the second heat exchange tubes and the longitudinal direction of a projection of the first straight portion of the second heat exchange tube, and in the width direction of the first heat exchange tube, a projection of a second passage of at least one of the first heat exchange tubes is located between the projection of the first passage of the first heat exchange tube and the projection of the first passage of a portion of the first bent portion, and a projection of a first passage of at least one of the first bent portions is located between the projection of the second passage of the first heat exchange tube and the projection of the second passage of a portion of the first bent portion, a first plate is provided within the second tube, the first plate dividing a flow path of the second tube into a first flow path and a second flow path, a part of the tube portion of the first bent portion being located within the first flow path and communicating with the first flow path, the first plate including a part of an inclined surface, the inclined surface guiding a larger amount of refrigerant to flow into the first passage of the first bent portion during operation of the heat exchanger, the first plate includes a first surface facing the first bent portion and a second surface facing away from the first bent portion, the first surface including two intersecting inclined surfaces, projection lines of the two inclined surfaces of the first surface including at least two intersecting line segments within the first plane, a distance from an intersection of the two line segments to a projection of an end surface of the first bent portion located within the second pipe is L3, a minimum distance from a projection of an end surface of a first passage of the first bent portion located within the second pipe to the first surface is L1, a minimum distance from a projection of an end surface of the second passage of the first bent portion located within the second pipe to the first surface is L2, and L3 is smaller than L1 and / or L3 is smaller than L2; A heat exchanger characterized by:

8. At least a portion of the first heat exchange tube is located within the first tube, a projection of an end face of the first heat exchange tube located within the first tube forms an angle with a projection of a cross section of the first heat exchange tube within the first plane, and a length of the first passage located within the first tube is greater than a length of the second passage located within the first tube, and / or a projection of an end face of the first bent portion located in the second tube and a projection of a cross section of the second heat exchange tube form an angle in the first plane, and a length of the first passage located in the second tube is greater than a length of the second passage located in the second tube; 4. The heat exchanger according to claim 1, wherein the heat exchanger is a heat exchanger having a heat source.

9. a tube portion of the first heat exchange tube extending to the first tube includes a first step portion, a dimension of the first step portion in the width direction of the first heat exchange tube is smaller than a width of the first heat exchange tube, a projection of a first passage end face of the first heat exchange tube and a projection of the first step portion overlap in the first plane, and a width of the first step portion is smaller than 1 / 2 of a width of the first heat exchange tube; 9. The heat exchanger according to claim 8.

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