Heat exchange tube structure and condenser for outdoor unit

Abstract

The invention discloses a heat exchange pipe structure and a condenser used for an outdoor unit, an upper area pipeline of the heat exchange pipe structure forms a plurality of sections of condensation flow paths, a lower area pipeline forms a plurality of sections of supercooling flow paths, the axial distance between a straight pipe located at the topmost end and a straight pipe located at the bottommost end of each condensation flow path is L1, and the axial distance between the straight pipe located at the topmost end and the straight pipe located at the bottommost end is L2. The axial distance between the straight pipe, located at the topmost end, of the supercooling flow path and the straight pipe, located at the bottommost end, of the supercooling flow path is L2. In the application, by controlling 12.5% < = (L2 / L1) * 100% < = 25.0%, the proportion of the condensation flow path in the upper area to the supercooling flow path in the lower area is appropriate, so that the mass of the heat exchange medium distributed in each condensation flow path in a partial load operation state is increased, and the heat exchange medium in each condensation flow path enters the supercooling flow path after confluence; and the supercooling flow path located in the lower area keeps sufficient heat exchange medium mass, so that the problem of heat exchange medium liquid accumulation of the heat exchange tube structure is solved, and the utilization efficiency of the condenser is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of heat exchange equipment, in particular to a heat exchange pipe structure and a condenser for an outdoor unit. BACKGROUND

[0002] In a multi-connected air conditioner, the design of the outdoor unit condenser is often based on the rated operating condition and full load operation condition to ensure that the heat exchange medium flow is evenly distributed in each flow path at maximum load, thereby maximizing the heat exchange efficiency. However, in actual operation scenarios, the multi-connected air conditioner is often in a partial load operation state, among which the small load operation state accounts for a certain proportion. At this time, the circulation amount of the heat exchange medium in the outdoor unit condenser pipeline is low, which causes the heat exchange medium in the lower flow path to be liquefied and unable to be discharged, resulting in liquid accumulation problem, and further reduces the circulation amount of the heat exchange medium in the condenser, which reduces the energy efficiency of the multi-connected air conditioner and makes it difficult to achieve optimal performance. SUMMARY

[0003] The present application provides a heat exchange pipe structure and a condenser for an outdoor unit to solve the problem of heat exchange medium liquid accumulation in the outdoor unit condenser during partial load operation of the multi-connected air conditioner, which affects the heat exchange efficiency.

[0004] In a first aspect, the present application provides a heat exchange pipe structure for a condenser of an outdoor unit, which comprises a plurality of groups of horizontal pipe units and a plurality of transition bend pipes. Each horizontal pipe unit comprises a plurality of straight pipes, the plurality of straight pipes are arranged side by side in the vertical direction, and each straight pipe extends in the horizontal direction. The plurality of groups of horizontal pipe units are arranged side by side in the horizontal direction. The plurality of straight pipes in the upper region of the plurality of groups of horizontal pipe units are alternately connected with a part of the transition bend pipes to form a plurality of condensation flow paths, and the plurality of straight pipes in the lower region of the plurality of groups of horizontal pipe units are alternately connected with another part of the transition bend pipes to form a plurality of supercooling flow paths. Each transition bend pipe is located on the same side of two adjacent straight pipes. The outlets of the plurality of condensation flow paths and the inlets of the plurality of supercooling flow paths are in communication to transport the heat exchange medium subjected to condensation treatment in the plurality of condensation flow paths to the plurality of supercooling flow paths for supercooling treatment. In each group of horizontal pipe units, the straight pipe a1 is the straight pipe located at the top end of the condensation flow path, the straight pipe a2 is the straight pipe located at the bottom end of the condensation flow path, the straight pipe b1 is the straight pipe located at the top end of the supercooling flow path, and the straight pipe b2 is the straight pipe located at the bottom end of the supercooling flow path. The straight pipe b1 is located below and adjacent to the straight pipe a2. In the vertical direction, the axial spacing between the straight pipe a1 and the straight pipe a2 is L1, the axial spacing between the straight pipe b1 and the straight pipe b2 is L2, and 12.5%≤(L2 / L1)*100%≤25.0%.

[0005] In some embodiments, the flow path of each of the condensation flow paths is S1, the flow path of each of the subcooling flow paths is S2, and 25%≤(S2 / S1)*100%≤50.0%.

[0006] In some embodiments, the flow channel length of the straight tubes in each of the groups of the cross tube units is equal, the distance between the adjacent two straight tubes of each of the cross tube units in the vertical direction is equal, the distance between the adjacent two groups of the cross tube units in the horizontal direction is equal, and the flow channel length of the transition elbow tubes is equal; the number of the straight tubes of each of the condensation flow paths is greater than the number of the straight tubes of each of the subcooling flow paths.

[0007] In some embodiments, the inlet of each of the condensation flow paths is located at the end of one of the straight tubes of the leftmost cross tube unit, and the outlet of each of the condensation flow paths is located at the end of one of the straight tubes of the rightmost cross tube unit; each of the condensation flow paths is connected from the last straight tube of x1 straight tubes of the same cross tube unit to the straight tube of the adjacent cross tube unit with the same position by one of the transition elbow tubes after passing through x1 straight tubes of the same cross tube unit, until the outlet of the condensation flow path is reached; wherein x1 straight tubes are x1 straight tubes arranged in the vertical direction in sequence, and 3≤x1≤5.

[0008] In some embodiments, in the leftmost cross tube unit, the inlets of the adjacent two condensation flow paths are located at the ends of the adjacent two straight tubes, respectively; in the rightmost cross tube unit, the outlets of the adjacent two condensation flow paths are located at the ends of the adjacent two straight tubes, respectively.

[0009] In some embodiments, the heat exchange tube structure further comprises: a condensation inlet pipe comprising a first main pipe and a plurality of first branch pipes connected to the first main pipe, the first branch pipes being connected to the inlets of the adjacent two condensation flow paths, or the first branch pipes being connected to the inlet of one of the condensation flow paths; a condensation outlet pipe comprising a second main pipe and a plurality of second branch pipes connected to the second main pipe, the second branch pipes being connected to the outlets of the adjacent two condensation flow paths, or the second branch pipes being connected to the outlet of one of the condensation flow paths.

[0010] In some embodiments, the heat exchange tube structure further comprises: a condensation outlet pipe comprising a second main pipe connected to the outlets of a plurality of the condensation flow paths; a subcooling outlet pipe comprising a third main pipe; a plurality of the subcooling flow paths form a plurality of subcooling units, each of the subcooling units comprises a plurality of the subcooling flow paths, and the inlets of the plurality of the subcooling flow paths are connected to the second main pipe; the heat exchange tube structure comprises 2m+1 groups of the cross tube units, two of the subcooling flow paths form a group, and the two subcooling flow paths of the same group converge at the 2m+1 group of the cross tube units and are connected to the third main pipe.

[0011] In some embodiments, the subcooling flow path of each subcooling unit includes a first subcooling flow path and a second subcooling flow path; in the first group of horizontal tube units, the inlet of the first subcooling flow path and the inlet of the second subcooling flow path are respectively located at the ends of the straight tubes furthest from each other, and the inlet of the first subcooling flow path is located above the inlet of the second subcooling flow path; each of the first subcooling flow path and the second subcooling flow path passes through x2 segments of the straight tubes of the same horizontal tube unit from its inlet, and is then connected by the last straight tube in the x2 segments through a transition bend. The straight pipe of the same position in the adjacent horizontal pipe unit is connected to the first subcooling flow path and the second subcooling flow path. The last straight pipe in each x2 segment of the straight pipe is connected to a first adapter pipe. The first adapter pipe is connected to one of the straight pipes in the 2m+1 group of horizontal pipe units. In the 2m+1 group of horizontal pipe units, after passing through x2 segments of the straight pipe, the outlets of the first subcooling flow path and the second subcooling flow path converge at the end of the last straight pipe to form a first total outlet. Wherein, 2≤x2≤4.

[0012] In some embodiments, the subcooling flow path of each subcooling unit includes a third subcooling flow path and a fourth subcooling flow path; in the (m+1)th group of horizontal tube units, the inlet of the third subcooling flow path and the inlet of the fourth subcooling flow path are respectively located at the ends of the straight tubes furthest from each other, and the inlet of the third subcooling flow path is located above the inlet of the fourth subcooling flow path; each of the third and fourth subcooling flow paths, after passing through x2 segments of the straight tube of the same horizontal tube unit from its inlet, is connected by the last straight tube in the x2 segments of the straight tube to the straight tube of the same position in the adjacent horizontal tube unit through a transition bend; and in the 2mth group of horizontal tube units... In the tube unit, the last straight pipe in each of the x2 segments of the straight pipes of the third subcooling flow path and the fourth subcooling flow path is connected to a second adapter pipe. The second adapter pipe is connected to another straight pipe in the 2m+1 group of horizontal tube units. In the 2m+1 group of horizontal tube units, after passing through the x2 segments of the straight pipes, the outlets of the third subcooling flow path and the fourth subcooling flow path converge at the end of the last straight pipe, forming a second total outlet. In the 2m+1 group of horizontal tube units, the first total outlet and the second total outlet are located at the ends of the straight pipes furthest from each other, and the first total outlet is located above the second total outlet.

[0013] In some embodiments, the condensing outlet pipe comprises a plurality of third branch pipes in communication with the second main pipe, and the supercooling outlet pipe comprises a plurality of fourth branch pipes in communication with the third main pipe; the inlet of the first supercooling flow path and the inlet of the third supercooling flow path are jointly communicated with one of the third branch pipes, and the inlet of the second supercooling flow path and the inlet of the fourth supercooling flow path are jointly communicated with another of the third branch pipes; the outlet of the first supercooling flow path and the outlet of the second supercooling flow path are jointly communicated with one of the fourth branch pipes, and the outlet of the third supercooling flow path and the outlet of the fourth supercooling flow path are jointly communicated with another of the fourth branch pipes.

[0014] In some embodiments, two adjacent groups of the horizontal pipe units are arranged in a vertical direction with a staggered arrangement; and / or, the horizontal pipe units have a windward side and a leeward side, the heat exchange pipe structure comprises a condensing inlet pipe, the condensing inlet pipe comprises a first main pipe, the first main pipe is in communication with the inlets of a plurality of the condensing flow paths, the first main pipe is arranged on the leeward side of a plurality of groups of the horizontal pipe units, and the second main pipe and the third main pipe are arranged on the windward side of a plurality of groups of the horizontal pipe units.

[0015] In some embodiments, the number of the condensing flow paths is n1, the number of the supercooling flow paths is n2, and the heat exchange pipe structure satisfies at least one of the following conditions: (1) n1 > n2; (2) 7 ≤ n1 ≤ 11; (3) 7 ≤ n2 ≤ 11.

[0016] In the second aspect, the embodiments of the present application further provide a condenser for an outdoor unit, comprising: the heat exchange pipe structure; and a plurality of fins arranged in a staggered arrangement along the extension direction of the straight pipes, the fins having a plurality of fin holes, and the straight pipes of a plurality of the horizontal pipe units are arranged in the fin holes one by one.

[0017] Based on the heat exchange pipe structure and the condenser for an outdoor unit provided by the embodiments of the present application, the pipe in the upper region is configured as a condensing flow path, and the pipe in the lower region is configured as a supercooling flow path. By controlling 12.5% ≤ (L2 / L1) * 100% ≤ 25.0%, the proportion of the condensing flow path in the upper region and the supercooling flow path in the lower region is appropriate. Under the premise that the circulation amount of the heat exchange medium is unchanged in each load state, the heat exchange pipe structure in the present application increases the amount of the heat exchange medium distributed in each condensing flow path in the partial load operation state. The heat exchange medium in each condensing flow path converges and then enters the supercooling flow path, so that there is sufficient heat exchange medium in the supercooling flow path in the lower region. Therefore, the liquid accumulation problem of the heat exchange pipe structure is improved, and the utilization efficiency of the condenser is improved. In the present application, the supercooling flow path is arranged to further reduce the temperature of the liquid heat exchange medium at the outlet of the heat exchange pipe structure, avoid the insufficient supercooling degree of the heat exchange medium, and slow down the vaporization of the heat exchange medium flowing out of the outdoor unit condenser in the long pipe under the installation characteristics of the multi-connected air conditioner with long pipes and high drop. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of a heat exchange tube structure according to an embodiment of this application;

[0020] Figure 2 This is a schematic diagram of another heat exchange tube structure according to an embodiment of this application.

[0021] Figure 3 This is a schematic diagram of the connection structure between the transition bend and the straight pipe in the condenser piping of an embodiment of this application.

[0022] Figure 4 This is a schematic diagram of a condensation flow path according to an embodiment of this application;

[0023] Figure 5 This is a schematic diagram of another condensation flow path according to an embodiment of this application;

[0024] Figure 6 This is a schematic diagram of the structure of a first subcooling flow path according to an embodiment of this application;

[0025] Figure 7 This is a schematic diagram of the structure of a second subcooling flow path according to an embodiment of this application;

[0026] Figure 8 This is a schematic diagram of the structure of a third subcooling flow path according to an embodiment of this application;

[0027] Figure 9 This is a schematic diagram of the structure of a fourth subcooling flow path according to an embodiment of this application;

[0028] Icon labels:

[0029] 1. Heat exchanger tube structure; 10. Condensation flow path; 20. Subcooling flow path; 30. Condensation inlet pipe; 40. Condensation outlet pipe; 50. Subcooling outlet pipe; 21. First subcooling flow path; 22. Second subcooling flow path; 23. Third subcooling flow path; 24. Fourth subcooling flow path; 31. First main pipe; 32. First branch pipe; 41. Second branch pipe; 42. Second main pipe; 43. Third branch pipe; 51. Third main pipe; 52. Fourth branch pipe; 100. Transition bend; 200. Straight pipe; 201. First transfer pipe; 202. Second transfer pipe; X. Airflow direction.

[0030] The objectives, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0032] It should be noted that all the directionality indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative position relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directionality indications also change accordingly.

[0033] In addition, the descriptions such as “first”, “second” and the like in the present application are only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined as “first”, “second” can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of “plurality” is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0034] In the present application, unless otherwise specifically defined and limited, the terms “connection”, “fixation” and the like should be understood in a broad sense, for example, “fixation” can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium; can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0035] In addition, the technical solutions of each embodiment of the present application can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor is it within the scope of protection claimed by the present application.

[0036] In a multi-connected air conditioner, the flow path design of the outdoor unit condenser is often based on the rated operating condition and full load operation condition to ensure that the heat exchange medium is evenly distributed in each flow path at maximum load, thereby maximizing the heat exchange efficiency. This flow path design has good condensing effect at full load or high load operating state, but when operating at small load refrigeration conditions, such as 25%, 20% and lower load conditions, the circulating amount of heat exchange medium is low, the gravitational pressure drop has a great influence on the distribution of heat exchange medium in each condensing flow path, and the amount of heat exchange medium in each condensing flow path from top to bottom gradually decreases. Among them, the amount of heat exchange medium in the lower condensing flow path is extremely small, and the condensed heat exchange medium cannot flow out of the condensing flow path and accumulate in the pipeline, affecting the heat exchange effect of the condenser.

[0037] Based on the above problems of the related art, the embodiments of the present application provide a heat exchange pipe structure and a condenser for an outdoor unit. The pipeline in the lower region of the heat exchange pipe structure is configured as a plurality of supercooling flow paths, and the outlets of the plurality of condensing flow paths above the heat exchange pipe structure are communicated with the inlets of the plurality of supercooling flow paths, so as to transport the heat exchange medium treated by the plurality of condensing flow paths to the plurality of supercooling flow paths for supercooling treatment. In this way, the heat exchange medium in the plurality of condensing flow paths flows into the plurality of supercooling flow paths, so that there is enough heat exchange medium in the pipeline at the bottom of the heat exchange pipe structure to improve the liquid accumulation problem caused by too little heat exchange medium. By controlling the proportion of the supercooling flow paths in the lower region and the condensing flow paths in the upper region in the vertical direction, the appropriate amount of heat exchange medium can be distributed in each condensing flow path at small load operation, avoiding liquid accumulation, and avoiding excessive length of the supercooling flow path, which causes large pressure loss, so that the outdoor unit condenser has good performance.

[0038] Please refer to Figures 1-2 , Figure 1 for a structural schematic diagram of a heat exchange pipe structure 1 according to an embodiment of the present application, Figure 2This is a schematic diagram of another heat exchanger tube structure 1 according to an embodiment of this application. The heat exchanger tube structure 1 includes multiple sets of horizontal tube units and multiple transition bends 100. The multiple sets of horizontal tube units are arranged side by side in the horizontal direction. Each horizontal tube unit includes multiple straight tubes 200 extending in the horizontal direction. The multiple straight tubes 200 are arranged side by side in the vertical direction. The transition bends 100 connect two straight tubes 200 on the same side. Among them, the multiple straight tubes 200 in the upper region of the multiple sets of horizontal tube units are alternately connected with a portion of the transition bends 100 to form multiple condensation flow paths 10. The multiple straight tubes 200 in the lower region of the multiple sets of horizontal tube units are alternately connected with another portion of the transition bends 100 to form multiple subcooling flow paths 20. In this embodiment of the application, the outlets of the multiple condensation flow paths 10 are connected to the inlets of the multiple subcooling flow paths 20 to transport the heat exchange medium condensed by the multiple condensation flow paths 10 to the multiple subcooling flow paths 20 for subcooling treatment. In this application, the area below the heat exchange tube structure 1 is configured as a subcooling flow path 20. On the one hand, under the premise that the circulation volume of the heat exchange medium remains unchanged under each load condition, the amount of heat exchange medium distributed in each condensing flow path 10 under the partial load operation condition is increased. On the other hand, after the liquid heat exchange medium in multiple condensing flow paths 10 converges and enters the subcooling flow path 20, it can ensure that there is sufficient heat exchange medium in the pipe at the bottom of the heat exchange tube structure 1. Thus, under the partial load operation condition, especially under the low load operation condition, liquid accumulation in the heat exchange tube structure 1 of the air conditioning system due to insufficient heat exchange medium is avoided, thereby improving the heat exchange performance of the air conditioning system under the partial load operation condition.

[0039] It should be noted that in the structural schematic diagram of the heat exchange tube structure 1 in the embodiment of this application, in order to facilitate the explanation of the arrangement of each flow path pipe, each straight pipe 200 is shown in a plane perpendicular to the extension direction of the straight pipe 200. In the actual view, the pipe diameter of the straight pipe 200 is the same as the pipe diameter of the transition bend 100. The straight pipe 200 cannot be directly seen in the above-mentioned view.

[0040] In one embodiment of this application, two adjacent sets of horizontal pipe units are staggered in the vertical direction. A portion of the transition bend 100 is connected to the same side of two adjacent straight pipe segments 200 in the same set of horizontal pipe units to connect the straight pipes 200 in the same set of horizontal pipe units. Another portion of the transition bend 100 is connected to the same side of two adjacent straight pipe segments 200 in two adjacent sets of horizontal pipe units to connect the straight pipes 200 in two adjacent sets of horizontal pipe units.

[0041] like Figures 3-5 As shown, Figure 3 This is a schematic diagram of the connection structure between the transition bend 100 and the straight pipe 200 in the condenser pipe 10 according to an embodiment of this application. Figure 4 This is a schematic diagram of the structure of a condensation flow path 10 according to an embodiment of this application. Figure 5For another structure schematic diagram of the condensing flow path 10 of the embodiment of the present application, in the embodiment of the present application, in each group of the horizontal pipe unit, the straight pipe 200 at the top end of the condensing flow path 10 is the straight pipe a1, the straight pipe 200 at the bottom end is the straight pipe a2, the straight pipe 200 at the top end of the subcooling flow path 20 is the straight pipe b1, the straight pipe 200 at the bottom end is the straight pipe b2, the straight pipe b1 is arranged below and adjacent to the straight pipe a2, in the vertical direction, the axial spacing between the straight pipe a1 and the straight pipe a2 is L1, the axial spacing between the straight pipe b1 and the straight pipe b2 is L2, 12.5%≤(L2 / L1)*100%≤25.0%. It can be understood that the heat exchange pipe structure of the embodiment of the present application configures the pipe in the upper region as the condensing flow path and configures the pipe in the lower region as the subcooling flow path, by controlling 12.5%≤(L2 / L1)*100%≤25.0%, the proportion of the condensing flow path 10 in the upper region and the subcooling flow path 20 in the lower region is appropriate, so as to ensure that the heat exchanger has good use performance. If (L2 / L1)*100%<12.5%, the proportion of the lower region in the heat exchange pipe structure 1 is too small, the heat exchange medium in the condensing flow path 10 at the relatively bottom part of the plurality of condensing flow paths 10 in the upper region is still small, and the improvement effect on the liquid accumulation problem under the part load operation state is poor. If (L2 / L1)*100%>25.0%, the proportion of the subcooling flow path 20 in the heat exchange pipe structure 1 is too large, the process length of the subcooling flow path 20 is too long, the pressure loss is large, the proportion of the condensing flow path 10 is small, the amount of the heat exchange medium that can be accommodated by the plurality of condensing flow paths 10 is reduced, and then the refrigeration capacity of the outdoor unit condenser is reduced.

[0042] In the related art, in order to adapt to diversified installation scenes, the pipe between the outdoor unit and the indoor unit of the multi-split air conditioner has the characteristics of long pipe and high drop, therefore, the liquid heat exchange medium obtained after refrigeration of the outdoor unit condenser must maintain a considerable subcooling degree, otherwise it is extremely likely to vaporize by absorbing environmental heat when passing through the long pipe, which affects the refrigeration effect of the multi-split air conditioner. In the embodiment of the present application, the subcooling flow path 20 is arranged in the lower region of the heat exchange pipe structure 1, which can further reduce the temperature of the liquid heat exchange medium after condensation, so as to ensure that the heat exchange medium flowing out of the outdoor unit condenser maintains sufficient subcooling degree. In an embodiment of the present application, the process of each condensing flow path 10 is S1, the process of each subcooling flow path 20 is S2, and 25%≤(S2 / S1)*100%≤50.0%. By controlling S2 / S1 to satisfy the above range, it is ensured that the subcooling flow path 20 has sufficient process length to achieve the required subcooling degree, while avoiding unnecessary pressure loss and cost increase caused by too long subcooling flow path 20.

[0043] Further, the flow channel lengths inside the straight pipes 200 of the multiple groups of the cross pipe units are equal, the intervals of the adjacent two straight pipes 200 of each cross pipe unit in the vertical direction are equal, the intervals of the adjacent two groups of the cross pipe units in the horizontal direction are equal, and the flow channel lengths inside the multiple transition bend pipes 100 are equal. In a specific implementation, the number of the straight pipes 200 of each condensation flow path 10 is greater than the number of the straight pipes 200 of each supercooling flow path 20, and the flow lengths of the condensation flow path 10 and the supercooling flow path 20 and the relative length relationship between the two flow lengths are controlled by controlling the number of the straight pipes 200.

[0044] It should be noted that in the embodiments of the present application, the pipe arrangement modes inside the multiple groups of the cross pipe units are the same, the pipe arrangement modes between the multiple groups of the cross pipe units are the same, the fins in the outdoor unit condenser are uniformly arranged, and therefore the flow lengths of the flow paths also reflect the heat exchange areas of the corresponding flow paths. In the embodiments of the present application, the heat exchange area M1 of the condensation area (including the multiple condensation flow paths and the fins connected thereto) and the heat exchange area M2 of the supercooling area (including the multiple supercooling flow paths and the fins connected thereto), the ratio of M2 / M1 is closely related to the ratio of L1 / L2, and 12.5%≤(M2 / M1)*100%≤25.0%.

[0045] In an embodiment of the present application, the multiple condensation flow paths 10 are arranged from top to bottom, the inlet of each condensation flow path 10 is located at the end of one of the straight pipes 200 of the leftmost cross pipe unit, and the outlet is located at the end of one of the straight pipes 200 of the rightmost cross pipe unit; each condensation flow path 10 is connected from the inlet thereof to the straight pipe 200 in the same position of the adjacent cross pipe unit through one of the transition bend pipes 100 after passing through x1 straight pipes of the same cross pipe unit, until the outlet of the condensation flow path 10 is reached. Wherein, the x1 straight pipes are x1 straight pipes arranged in sequence in the vertical direction, and 3≤x1≤5. It should be noted that the smaller the pipe diameter of the straight pipe 200, the higher the flow speed of the heat exchange medium inside the straight pipe 200, and the greater the flow resistance, and therefore a shorter flow length needs to be matched to maintain the fluid pressure and flow of the heat exchange medium. Under the premise that the number of the straight pipes 200 in each cross pipe unit is constant, the greater the value of x1, the fewer the number of the condensation flow paths 10 in the heat exchange pipe structure 1, and the longer the flow length of each condensation flow path 10. Therefore, the value of x1 in the embodiments of the present application is related to the pipe diameter of the straight pipe 200, and when the pipe diameter of the straight pipe 200 is larger, the value of x1 is also allowed to be larger.

[0046] Optionally, in the heat exchange pipe structure 1, Figure 1 as shown in FIG. 1, three groups of cross pipe units are provided, the pipe diameter of the straight pipe 200 is φ5, and the value of x1 can be 4.

[0047] In an embodiment of the present application, in the leftmost cross-pipe unit, the inlets of the two adjacent condensation flow paths 10 are located at the ends of the two adjacent straight pipes 200; in the rightmost cross-pipe unit, the outlets of the two adjacent condensation flow paths 10 are located at the ends of the two adjacent straight pipes 200. The inlet temperatures of the condensation flow paths 10 are similar, and as the condensation process proceeds, the temperatures of the straight pipes 200 adjacent to each other in the two adjacent condensation flow paths 10 also remain similar in the vertical direction. This design helps to reduce the area where the temperature gradient inside the heat exchange pipe structure 1 is too large, and improves the uniformity of the overall temperature distribution.

[0048] The heat exchange pipe structure 1 further includes a condensation inlet pipe 30 and a condensation outlet pipe 40. The condensation inlet pipe 30 includes a first main pipe 31 and a plurality of first branch pipes 32 connected to the first main pipe 31, and the heat exchange medium in the first main pipe 31 enters each condensation flow path 10 through the plurality of first branch pipes 32. In the present application, if the inlets of the two adjacent condensation flow paths 10 are located at the ports of the two adjacent straight pipes 200, the two condensation flow paths 10 can be connected to the same first branch pipe 32 to reduce the number of first branch pipes 32 and lower the cost. At this time, the side of the first branch pipe 32 away from the first main pipe 31 is provided with two connection ports, and the two connection ports are respectively connected to the inlets of the two adjacent condensation flow paths 10. In particular, in the upper region of the heat exchange pipe structure 1, the inlet of the first condensation flow path 10 from top to bottom and / or the inlet of the last condensation flow path 10 are not adjacent to the inlets of the other condensation flow paths 10. At this time, the first branch pipe 32 connected thereto is provided with only one connection port on the side away from the first main pipe 31, and is connected to the inlet of only one condensation flow path 10.

[0049] The condensation outlet pipe 40 includes a plurality of second branch pipes 41 and a second main pipe 42 connected to the plurality of second branch pipes 41, and the condensed heat exchange medium in the plurality of second branch pipes 41 flows into the second main pipe 42 and then flows into the supercooling flow path 20 through the second branch pipes 41. Similarly, if the outlets of the two adjacent condensation flow paths 10 are located at the ports of the two adjacent straight pipes 200, the two condensation flow paths 10 can be connected to the same second branch pipe 41 to reduce the number of second branch pipes 41 and lower the cost. Among the plurality of second branch pipes 41, at least part of the second branch pipes 41 are connected to the outlets of the two adjacent condensation flow paths 10. In particular, the inlet of the first condensation flow path 10 from top to bottom and / or the inlet of the last condensation flow path 10 can not be adjacent to the inlets of the other condensation flow paths 10. Correspondingly, the second branch pipe 41 connected thereto is connected to the outlet of only one condensation flow path 10.

[0050] It should be noted that when the multi-connected air conditioner is in full load or large load operation state, the flow of the heat exchange medium of the second main pipe 42 is large after the plurality of second branch pipes 41 converge, at this time, if only one subcooling flow path 20 is arranged in the lower area, the flow length of the subcooling flow path 20 will be longer, and the pressure loss of the heat exchange medium in the subcooling flow path 20 is large. In the embodiment of the application, a plurality of subcooling flow paths 20 are arranged to reduce the flow length of a single subcooling flow path 20, reduce the flow of the heat exchange medium in each subcooling flow path 20, and improve the flow efficiency of the heat exchange medium in the lower area.

[0051] In the embodiment of the application, the heat exchange pipe structure 1 further comprises a subcooling outlet pipe 50, the subcooling outlet pipe 50 comprises a third main pipe 51, and the plurality of subcooling flow paths 20 form a plurality of subcooling units, each subcooling unit comprises a plurality of subcooling flow paths 20, and the inlets of the plurality of subcooling flow paths 20 are in communication with the second main pipe 42. The heat exchange pipe structure 1 comprises 2m+1 groups of transverse pipe units, the plurality of subcooling flow paths 20 are two by two as a group, and the two subcooling flow paths 20 in the same group converge at the 2m+1 group of transverse pipe units and are in communication with the third main pipe 51.

[0052] The condensing outlet pipe 40 further comprises a plurality of third branch pipes 43 in communication with the second main pipe 42, and the subcooling outlet pipe 50 comprises a plurality of fourth branch pipes 52 in communication with the third main pipe 51. Please refer to Figures 6-9 , Figure 6 FIG. 1 is a structural schematic diagram of a first subcooling flow path 21 according to an embodiment of the application, Figure 7 FIG. 2 is a structural schematic diagram of a second subcooling flow path 22 according to an embodiment of the application, Figure 8 FIG. 3 is a structural schematic diagram of a third subcooling flow path 23 according to an embodiment of the application, Figure 9 FIG. 4 is a structural schematic diagram of a fourth subcooling flow path 24 according to an embodiment of the application, the subcooling unit comprises the first subcooling flow path 21, the second subcooling flow path 22, the third subcooling flow path 23, and the fourth subcooling flow path 24, wherein the inlet of the first subcooling flow path 21 and the inlet of the third subcooling flow path 23 are in common communication with one of the third branch pipes 43, the inlet of the second subcooling flow path 22 and the inlet of the fourth subcooling flow path 24 are in common communication with another third branch pipe 43; the outlet of the first subcooling flow path 21 and the outlet of the second subcooling flow path 22 are in common communication with one of the fourth branch pipes 52, and the outlet of the third subcooling flow path 23 and the outlet of the fourth subcooling flow path 24 are in common communication with another third branch pipe 43. The heat exchange medium after condensation of the second main pipe 42 is once divided into a plurality of third branch pipes 43, and after the third branch pipe 43, it is twice divided into two subcooling flow paths 20, and after a plurality of divisions, the flow of the heat exchange medium in each subcooling flow path 20 is reduced. The number of pipelines in the lower area is limited, and in the embodiment of the application, the second half of the flow of every two subcooling flow paths 20 is converged to ensure the flow length of each subcooling flow path 20 and ensure that the heat exchange medium passing through the subcooling flow path 20 has sufficient subcooling degree.

[0053] like Figures 6-7 As shown, the subcooling flow path 20 of each subcooling unit includes a first subcooling flow path 21 and a second subcooling flow path 22; in the first group of horizontal tube units, the inlet of the first subcooling flow path 21 and the inlet of the second subcooling flow path 22 are respectively located at the ends of the straight pipes 200 furthest from each other, and the inlet of the first subcooling flow path 21 is located above the inlet of the second subcooling flow path 22; each of the first subcooling flow path 21 and the second subcooling flow path 22 passes through x2 segments of straight pipe in the same horizontal tube unit from its inlet, and then passes through a transition bend 100 from the last straight pipe 200 in the x2 segments. Connected to the straight pipe 200 of the same position in the adjacent horizontal pipe unit; and in the m-th group of horizontal pipe units, the last straight pipe 200 in the x2-segment straight pipe of the first subcooling flow path 21 and the second subcooling flow path 22 is connected to a first adapter pipe 201, the first adapter pipe 201 is connected to one of the straight pipes 200 in the 2m+1-th group of horizontal pipe units, and in the 2m+1-th group of horizontal pipe units, after x2-segment straight pipes, the outlet of the first subcooling flow path 21 and the outlet of the second subcooling flow path 22 converge at the end of the last straight pipe 200; wherein, 2≤x2≤4.

[0054] like Figures 8-9 As shown, the subcooling flow path 20 of each subcooling unit includes a third subcooling flow path 23 and a fourth subcooling flow path 24; in the (m+1)th group of horizontal tube units, the inlet of the third subcooling flow path 23 and the inlet of the fourth subcooling flow path 24 are respectively located at the ends of the straight pipes 200 furthest from each other, and the inlet of the third subcooling flow path 23 is located above the inlet of the fourth subcooling flow path 24; each of the third subcooling flow path 23 and the fourth subcooling flow path 24 passes through the x2-segment straight pipe of the same horizontal tube unit from its inlet, and then passes through the last straight pipe 200 in the x2-segment straight pipe via a transition pipe. The bend 100 is connected to the straight pipe 200 of the same position in the adjacent horizontal pipe unit; and in the 2m group of horizontal pipe units, the last straight pipe 200 in the x2 segments of the straight pipes of the third subcooling flow path 23 and the fourth subcooling flow path 24 is connected to a second transfer pipe 202, the second transfer pipe 202 is connected to another straight pipe 200 in the 2m+1 group of horizontal pipe units, and in the 2m+1 group of horizontal pipe units, after the x2 segments of straight pipes, the outlets of the third subcooling flow path 23 and the fourth subcooling flow path 24 converge at the end of the last straight pipe 200.

[0055] The outlet where the first subcooling flow path 21 and the second subcooling flow path 22 converge is defined as the first total outlet, and the outlet where the third subcooling flow path 23 and the fourth subcooling flow path 24 converge is defined as the second total outlet. In the 2m+1 group of horizontal tube units, the first total outlet and the second total outlet are located at the ends of the straight tubes furthest from each other, and the first total outlet is located above the second total outlet.

[0056] In such Figure 1The heat exchange pipe structure 1 is provided with three groups of transverse pipe groups, that is, m = 1, and the value of x2 is 1; the inlets of the first subcooling flow path 21 and the second subcooling flow path 22 are located in the first group of transverse pipe group units; the inlets of the third subcooling flow path 23 and the fourth subcooling flow path 24 are located in the second group of transverse pipe units; and the first total outlet and the second total outlet are both located in the third group of transverse pipe units.

[0057] In an embodiment of the present application, the transverse pipe unit has a windward side and a leeward side; in the heat exchange pipe structure 1, the first main pipe 31 in the condensation inlet pipe 30 is arranged on the leeward side of the plurality of transverse pipe units, and the second main pipe 42 of the condensation outlet pipe 40 is arranged on the windward side of the plurality of transverse pipe units; in this way, in the horizontal direction, the overall flow direction of the heat exchange medium in each condensation flow path 10 is opposite to the air flow direction X, and this counter-flow arrangement is conducive to improving the heat exchange efficiency. Further, the third main pipe 51 in the subcooling outlet pipe 50 is arranged on the windward side of the plurality of transverse pipe units, although the second main pipe 42 is arranged on the windward side of the plurality of transverse pipe units, in the embodiment of the present application, the inlets of each subcooling flow path 20 are arranged on the leeward side of the plurality of transverse pipe units and are communicated with the second main pipe 42 through a plurality of third branch pipes 43; in this way, each subcooling flow path 20 is also arranged in counter-flow.

[0058] In an embodiment of the present application, the number of condensation flow paths 10 is n1, and the number of subcooling flow paths 20 is n2; the heat exchange pipe structure 1 satisfies at least one of the following conditions: (1) n1 > n2; (2) 7 ≤ n1 ≤ 11; (3) 7 ≤ n2 ≤ 11. It can be understood that the number of pipes in the upper region of the heat exchange pipe structure 1 is more than the number of pipes in the lower region; under this premise, if the number of subcooling flow paths 20 in the lower region is too large, the flow process of each subcooling flow path 20 will be short, and it is difficult to ensure that the temperature of the heat exchange medium at the outlet of the heat exchange pipe structure 1 is low enough. For example, as shown in Figure 1 Taking the heat exchange pipe structure 1 as an example, the number of condensation flow paths 10 is 9, and the number of subcooling flow paths 20 is 8.

[0059] The present application also provides a condenser for an outdoor unit, which comprises the above-mentioned heat exchange pipe structure 1 and a plurality of fins; the plurality of fins are arranged at intervals along the extension direction of the straight pipes; the fins have a plurality of fin holes; and the straight pipes of the plurality of transverse pipe units are arranged one by one in the fin holes.

[0060] In the condenser of the outdoor unit, the inlet of the heat exchange pipe structure 1 is communicated with the compressor, and the outlet of the heat exchange pipe structure 1 is connected with the heat exchanger of the indoor unit through a throttling device. In the refrigeration process, the gaseous heat exchange medium discharged by the compressor enters each condensation flow path 10 through the condensation inlet pipe 30 of the inlet of the heat exchange pipe structure 1 to be condensed, forming liquid heat exchange medium, and then the liquid heat exchange medium is further subcooled in each subcooling flow path 20 and then enters the heat exchanger of the indoor unit through the throttling device at the outlet of the heat exchange pipe structure 1.

[0061] The above merely describes the preferred embodiments of the present application, and is not intended to limit the patent scope of the present application. Any equivalent structural changes made according to the content of the present application specification and drawings, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A heat exchange tube structure (1) for the condenser of an outdoor unit, characterized in that, include: Multiple sets of horizontal tube units, each of the horizontal tube units includes multiple straight tubes (200), the multiple straight tubes (200) are arranged side by side in the vertical direction, and each of the straight tubes (200) extends in the horizontal direction, and the multiple sets of horizontal tube units are arranged side by side in the horizontal direction; Multiple transition bends (100), multiple sets of horizontal pipe units located in the upper region, multiple segments of straight pipes (200) and a portion of the transition bends (100) are alternately connected to form multiple condensation flow paths (10), multiple sets of horizontal pipe units located in the lower region, multiple segments of straight pipes (200) and another portion of the transition bends (100) are alternately connected to form multiple subcooling flow paths (20); wherein, each transition bend (100) is located on the same side of two adjacent segments of straight pipes (200); The outlets of the multiple condensing flow paths (10) are connected to the inlets of the multiple subcooling flow paths (20) to transport the heat exchange medium after condensation treatment by the multiple condensing flow paths (10) to the multiple subcooling flow paths (20) for subcooling treatment; In each group of horizontal tube units, the straight tube (200) at the top of the condensation flow path (10) is straight tube a1, and the straight tube (200) at the bottom is straight tube a2. In the subcooling flow path (20), the straight tube (200) at the top is straight tube b1, and the straight tube (200) at the bottom is straight tube b2. Straight tube b1 is located below and adjacent to straight tube a2. In the vertical direction, the axial distance between straight tube a1 and straight tube a2 is L1, and the axial distance between straight tube b1 and straight tube b2 is L2. 12.5% ​​≤ (L2 / L1)*100% ≤ 25.0%.

2. The heat exchange tube structure (1) according to claim 1, characterized in that, The flow path of each condensation flow path (10) is S1, and the flow path of each subcooling flow path (20) is S2, with 25% ≤ (S2 / S1)*100% ≤ 50.0%.

3. The heat exchange tube structure (1) according to claim 2, characterized in that, The flow channel lengths inside the straight pipes (200) of the multiple sets of horizontal pipe units are equal, and the vertical spacing between two adjacent straight pipes (200) of each horizontal pipe unit is equal, the horizontal spacing between two adjacent sets of horizontal pipe units is equal, and the flow channel lengths inside the multiple transition bends (100) are equal. The number of straight pipes (200) in each of the condensation flow paths (10) is greater than the number of straight pipes (200) in each of the subcooling flow paths (20).

4. The heat exchange tube structure (1) according to claim 1, characterized in that, The inlet of each of the condensation flow paths (10) is located at the end of one of the straight pipes (200) of the leftmost horizontal pipe unit, and the outlet is located at the end of one of the straight pipes (200) of the rightmost horizontal pipe unit. Each of the condensation flow paths (10) passes through the x1 segment of the straight pipe (200) of the same horizontal pipe unit from its inlet, and is then connected by the last straight pipe (200) in the x1 segment of the straight pipe (200) to the straight pipe (200) of the same position in the adjacent horizontal pipe unit through a transition bend (100) until it reaches the outlet of the condensation flow path (10); Among them, the straight pipe (200) in segment x1 is the straight pipe (200) arranged in sequence along the vertical direction, and 3≤x1≤5.

5. The heat exchange tube structure (1) according to claim 4, characterized in that, In the leftmost horizontal tube unit, the inlets of the two adjacent condensation flow paths (10) are located at the ends of the two adjacent straight tubes (200); In the rightmost horizontal tube unit, the outlets of the two adjacent condensation flow paths (10) are located at the ends of the two adjacent straight tubes (200).

6. The heat exchange tube structure (1) according to claim 4 or 5, characterized in that, The heat exchanger tube structure (1) also includes: The condenser inlet pipe (30) includes a first main pipe (31) and a plurality of first branch pipes (32) connected to the first main pipe (31). The first branch pipes (32) are connected to the inlets of two adjacent condenser flow paths (10), or the first branch pipes (32) are connected to the inlet of one of the condenser flow paths (10). The condenser outlet pipe (40) includes a plurality of second branch pipes (41) and a second main pipe (42) connected to the plurality of second branch pipes (41). The second branch pipes (41) are connected to the outlets of two adjacent condenser flow paths (10), or the second branch pipes (41) are connected to the outlet of one of the condenser flow paths (10).

7. The heat exchange tube structure (1) according to claim 1, characterized in that, The heat exchanger tube structure (1) also includes: The condensate outlet pipe (40) includes a second main pipe (42) connected to the outlets of the plurality of condensate flow paths (10); The subcooled outlet pipe (50) includes the third main pipe (51); Multiple subcooling flow paths (20) form multiple subcooling units, each subcooling unit including multiple subcooling flow paths (20), and the inlet of each of the multiple subcooling flow paths (20) is connected to the second main pipe (42); The heat exchange tube structure (1) includes 2m+1 sets of horizontal tube units, and multiple subcooling flow paths (20) are grouped in pairs. The two subcooling flow paths (20) in the same group intersect at the 2m+1 set of horizontal tube units and are connected to the third main tube (51).

8. The heat exchange tube structure (1) according to claim 7, characterized in that, The subcooling flow path (20) of each of the subcooling units includes a first subcooling flow path (21) and a second subcooling flow path (22); In the first group of horizontal tube units, the inlet of the first subcooling flow path (21) and the inlet of the second subcooling flow path (22) are respectively located at the ends of the straight tubes (200) furthest from each other, and the inlet of the first subcooling flow path (21) is located above the inlet of the second subcooling flow path (22); The first subcooling flow path (21) and the second subcooling flow path (22) each pass through the x2 segments of the straight pipe (200) of the same horizontal pipe unit from their inlet, and are then connected by the last straight pipe (200) in the x2 segments of the straight pipe (200) to the straight pipe (200) of the same position in the adjacent horizontal pipe unit through a transition bend (100); In the horizontal tube unit of the m group, the last straight pipe (200) of the x2 segments of the straight pipe (200) of the first subcooling flow path (21) and the second subcooling flow path (22) is connected to a first adapter pipe (201). The first adapter pipe (201) is connected to one of the straight pipes (200) of the horizontal tube unit of the 2m+1 group. In the horizontal tube unit of the 2m+1 group, after passing through the x2 segments of the straight pipe (200), the outlet of the first subcooling flow path (21) and the outlet of the second subcooling flow path (22) converge at the end of the last straight pipe (200) to form a first total outlet. Where 2≤x2≤4.

9. The heat exchange tube structure (1) according to claim 8, characterized in that, The subcooling flow path (20) of each of the subcooling units includes a third subcooling flow path (23) and a fourth subcooling flow path (24); In the (m+1)th group of the horizontal tube unit, the inlet of the third subcooling flow path (23) and the inlet of the fourth subcooling flow path (20) are respectively located at the ends of the straight tubes (200) furthest from each other, and the inlet of the third subcooling flow path (23) is located above the inlet of the fourth subcooling flow path (24); The third subcooling flow path (23) and the fourth subcooling flow path (24) each pass through the x2 segments of the straight pipe (200) of the same horizontal pipe unit from their inlet, and are then connected by the last straight pipe (200) in the x2 segments of the straight pipe (200) to the straight pipe (200) of the same position in the adjacent horizontal pipe unit through a transition bend (100); In the horizontal tube unit of the 2m group, the last straight pipe (200) of the x2 segments of the straight pipe (200) of the third subcooling flow path (23) and the fourth subcooling flow path (24) is connected to a second adapter pipe (202). The second adapter pipe (202) is connected to another straight pipe (200) of the horizontal tube unit of the 2m+1 group. In the horizontal tube unit of the 2m+1 group, after passing through the x2 segments of the straight pipe (200), the outlet of the third subcooling flow path (23) and the outlet of the fourth subcooling flow path (24) converge at the end of the last straight pipe (200) and form a second total outlet. In the horizontal tube unit of the 2m+1 group, the first total outlet and the second total outlet are located at the ends of the straight tubes (200) furthest from each other, and the first total outlet is located above the second total outlet.

10. The heat exchange tube structure (1) according to claim 9, characterized in that, The condensate outlet pipe (40) includes multiple third branch pipes (43) connected to the second main pipe (42), and the subcooling outlet pipe (50) includes multiple fourth branch pipes (52) connected to the third main pipe (51); The inlet of the first subcooling flow path (21) and the inlet of the third subcooling flow path (23) are connected to one of the third branch pipes (43), and the inlet of the second subcooling flow path (22) and the inlet of the fourth subcooling flow path (24) are connected to the other third branch pipe (43). The outlet of the first subcooling flow path (21) and the outlet of the second subcooling flow path (22) are connected to one of the fourth branch pipes (52), and the outlet of the third subcooling flow path (23) and the outlet of the fourth subcooling flow path (24) are connected to the other fourth branch pipe (52).

11. The heat exchange tube structure (1) according to claim 7, characterized in that, The two adjacent sets of the horizontal tube units are staggered in the vertical direction; and / or, The horizontal tube unit has a windward side and a leeward side. The heat exchange tube structure (1) includes a condenser inlet pipe (30). The condenser inlet pipe (30) includes a first main pipe (31). The first main pipe (31) is connected to the inlet of multiple condenser flow paths (10). The first main pipe (31) is located on the leeward side of multiple sets of horizontal tube units. The second main pipe (42) and the third main pipe (51) are located on the windward side of multiple sets of horizontal tube units.

12. The heat exchange tube structure (1) according to any one of claims 1-11, characterized in that, The number of condensing flow paths (10) is n1, the number of subcooling flow paths (20) is n2, and the heat exchange tube structure (1) satisfies at least one of the following conditions: (1) n1>n2; (2)7≤n1≤11； (3)7≤n2≤11。 13. A condenser for an outdoor unit, characterized in that, include: The heat exchange tube structure (1) as described in any one of claims 1-12; as well as Multiple fins are arranged at intervals along the extension direction of the straight tube (200). The fins have multiple rows of fin holes, and the straight tubes (200) of the multiple rows of the horizontal tube units are correspondingly inserted through the fin holes.

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