Fin type heat exchanger flow path and fin type heat exchanger thereof

Abstract

The finned heat exchanger flow path comprises a plurality of first flow paths, each first flow path comprises a plurality of two-way connectors, a three-way connector and a plurality of heat exchange tubes, the two two-way connectors, the three-way connectors and the heat exchange tubes form two branches of the first flow paths, the total length of any branch is L, and the total length of any branch is L; and the three-way joint is positioned between 0.3 L and 0.8 L. According to the finned heat exchanger flow path, the three-way connector is arranged to form two branches of the first flow path, and the three-way connector is limited to be located between 0.3 L and 0.8 L, in a heating mode, when a refrigerant passes through the three-way connector, the flow resistance is reduced, evaporation heat exchange of the refrigerant is facilitated, and the heating capacity is improved; in the refrigeration mode, the flow speed of a refrigerant is increased when the refrigerant passes through the three-way connector, heat exchange with a cold source is facilitated, and the refrigeration performance is improved; the refrigerating performance and the heating performance are improved at the same time, and the air conditioner has the advantages of being simple in structure and high in refrigerant heat exchange efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchange, in particular to a fin type heat exchanger flow path and a fin type heat exchanger thereof. Background Art

[0002] During the heating operation, the finned heat exchanger acts as an evaporator. Liquid refrigerant enters from the liquid distribution pipe of the finned heat exchanger and exchanges heat with the heat source. The liquid refrigerant absorbs heat, heats up, evaporates, and turns into gaseous refrigerant, which flows out from the gas collecting pipe. Since the refrigerant is at a low pressure in the finned heat exchanger, if the flow path of the finned heat exchanger is designed to be too long, the pipeline resistance will increase, thus affecting the heat exchange performance, thereby reducing the heating capacity of the whole machine. Therefore, for heating applications, the finned heat exchanger flow needs to be designed to be shorter.

[0003] During the refrigeration operation, the finned heat exchanger acts as a condenser. The gaseous refrigerant flows in from the gas collecting pipe of the finned heat exchanger and exchanges heat with the cold source. The gaseous refrigerant releases heat, cools down, condenses, and turns into liquid refrigerant, which flows out from the liquid separator. Since the refrigerant is under high pressure in the finned heat exchanger, if the finned heat exchanger flow is designed too short, the overall condensation effect cannot be guaranteed, thereby reducing the refrigeration capacity of the whole machine. Therefore, for refrigeration applications, the finned heat exchanger flow needs to be designed to be longer.

[0004] In the design and use of traditional heat pump units, the finned heat exchanger adopts a "one-in, one-out" flow path. This flow path design is relatively simple and cannot meet the two different heat exchange process lengths of heating and cooling, resulting in the inability to achieve optimal performance for both heating and cooling at the same time; even if "one-in, multiple-out" is adopted, a good heat exchange effect cannot be guaranteed, and problems such as incomplete evaporation of the refrigerant in the heating process and insufficient condensation in the cooling process will occur. Utility Model Content

[0005] Based on this, the purpose of the utility model is to provide a fin heat exchanger flow path and a fin heat exchanger thereof. Two branches of the first flow path are formed by setting a three-way joint, and the three-way joint is limited to be between 0.3L and 0.8L. In the heating mode, the flow resistance is reduced when the refrigerant passes through the three-way joint, which is beneficial to the evaporation heat exchange of the refrigerant and the improvement of the heating capacity; in the cooling mode, the flow velocity of the refrigerant increases when passing through the three-way joint, which is beneficial to the heat exchange with the cold source and the improvement of the cooling performance; the utility model improves the cooling performance and the heating performance at the same time, and has the advantages of simple structure and high refrigerant heat exchange efficiency.

[0006] A fin-type heat exchanger flow path includes multiple first flow paths, wherein the first flow path includes multiple two-way joints, one three-way joint and multiple heat exchange tubes, the multiple two-way joints, one three-way joint and the multiple heat exchange tubes form two branches of the first flow path, the total length of any one of the branches is L, and the three-way joint is located between 0.3L and 0.8L.

[0007] The utility model describes a fin-type heat exchanger flow path, which forms two branches of the first flow path by setting a three-way joint, and limits the three-way joint to be between 0.3L and 0.8L. In the heating mode, the flow resistance is reduced when the refrigerant passes through the three-way joint, which is beneficial to the evaporation heat exchange of the refrigerant and improves the heating capacity; in the cooling mode, the flow velocity is increased when the refrigerant passes through the three-way joint, which is beneficial to the heat exchange with the cold source and improves the cooling performance; the utility model improves the cooling performance and the heating performance at the same time, and has the advantages of simple structure and high refrigerant heat exchange efficiency.

[0008] Furthermore, the two branches include a first branch and a second branch, the first branch and the second branch have 8 pipe openings respectively, and the inlet of the three-way joint is arranged at the 4th pipe opening after the refrigerant inlet of the first flow path.

[0009] Furthermore, the two branches include a third branch and a fourth branch, the third branch and the fourth branch have 6 pipe openings respectively, and the inlet of the three-way joint is arranged at the second pipe opening after the refrigerant inlet of the first flow path.

[0010] Furthermore, the two branches include a fifth branch and a sixth branch, the fifth branch and the sixth branch have 10 pipe openings respectively, and the inlet of the three-way joint is arranged at the sixth pipe opening after the refrigerant inlet of the first flow path.

[0011] Further, among the plurality of the first flow paths, the plurality of the two branches include one or more of a first branch and a second branch, a third branch and a fourth branch, and a fifth branch and a sixth branch.

[0012] The utility model also provides a finned heat exchanger, comprising any one of the above-mentioned finned heat exchanger flow paths;

[0013] Furthermore, it also includes a gas collecting pipe, a first end plate, a second end plate and a plurality of fins, the gas collecting pipe is connected with the two branches of the first flow path, the first end plate and the second end plate are respectively fixed on the two ends of the heat exchange tube, the fins are sleeved on the fin type heat exchanger flow path, and the plurality of fins are arranged in parallel along the direction in which the first heat exchange tube extends;

[0014] Furthermore, the spacing between the heat exchange tubes is 21-25 mm, and the inner diameter of the heat exchange tubes is 5-12 mm.

[0015] Furthermore, it also includes a separation capillary, which is connected to the first flow path, has an inner diameter of 3.2 mm, an outer diameter of 4.2 mm, and a length of 620 mm to 1060 mm.

[0016] Furthermore, it also includes a heat shrink tube, which is sleeved outside the liquid separation capillary, and the length of the heat shrink tube is 570mm to 1010mm.

[0017] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0018] ① During the heating process, the liquid refrigerant enters from the refrigerant inlet and exchanges heat in the heat exchange tube, absorbing heat and heating up. When flowing through the three-way joint, the liquid refrigerant is transformed into a gaseous refrigerant, and the density decreases and the volume increases. At the same time, the flow path is also divided from a single flow path into two flow paths. On the one hand, the overall flow resistance of the refrigerant is reduced, which is conducive to evaporation heat exchange. On the other hand, it can better cooperate with the changes in the two phases of the refrigerant, so that the refrigerant can evaporate into a gaseous state more fully, thereby improving the heating capacity;

[0019] ② During the refrigeration process, the gaseous refrigerant enters from two branches and exchanges heat in the heat exchange tube, releasing heat and cooling down. When flowing through the three-way joint, the gaseous refrigerant is transformed into liquid refrigerant, the density increases and the volume decreases. At the same time, the flow path is also merged from two flow paths to a single flow path. On the one hand, the overall flow resistance of the refrigerant is increased, and the refrigerant flow rate is increased, which is conducive to condensation and heat absorption. On the other hand, it can better cooperate with the changes in the two phases of the refrigerant, so that the refrigerant can be more fully condensed into liquid, thereby improving the refrigeration capacity;

[0020] ③ Set the three-way joint between 0.3L and 0.8L to improve both cooling and heating performances, and be able to cope with situations with good and poor wind fields; if the three-way joint is set at a position less than 0.3L, the refrigerant will not evaporate completely during the heating process and will be in a liquid refrigerant state. At this time, the one-to-two split will easily lead to a slower flow rate and a poorer heat exchange evaporation effect; if the three-way joint is set at a position greater than 0.8L, the refrigerant will not condense fully during the cooling process, and most of the refrigerant will be in a gaseous state. At this time, the two-to-one split will cause liquid refrigerant to accumulate in the pipeline, affecting the defrosting effect;

[0021] ④ By setting the separation capillary, the temperature of the flow path is adjusted to ensure the overall heat exchange effect; further, by limiting the length of the separation capillary, the temperature of each flow path is made similar to ensure the overall heat exchange effect.

[0022] In order to better understand and implement the present invention, the present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1A schematic diagram of a flow path of a fin-type heat exchanger according to an embodiment;

[0024] Figure 2 for Figure 1 A schematic diagram of a first flow path in a finned heat exchanger flow path shown in area A;

[0025] Figure 3 for Figure 2 A schematic diagram of a first branch in a first flow path shown;

[0026] Figure 4 for Figure 2 A schematic diagram of a second branch in a first flow path shown;

[0027] Figure 5 for Figure 2 The schematic diagram of the flow direction of the refrigerant in the first flow path in the heating mode is shown;

[0028] Figure 6 for Figure 2 The schematic diagram of the flow direction of the refrigerant in the first flow path in the cooling mode is shown;

[0029] Figure 7 for Figure 1 A schematic diagram of a first flow path in a finned heat exchanger flow path shown in area B;

[0030] Figure 8 for Figure 7 A schematic diagram of a first branch in a first flow path shown;

[0031] Fig. 9 for Figure 7 A schematic diagram of a second branch in a first flow path shown;

[0032] Fig.10 for Figure 7 The schematic diagram of the flow direction of the refrigerant in the first flow path in the heating mode is shown;

[0033] Fig.11 for Figure 7 The schematic diagram of the flow direction of the refrigerant in the first flow path in the cooling mode is shown;

[0034] Fig.12 for Figure 1 A schematic diagram of a first flow path in a finned heat exchanger flow path shown in area C;

[0035] Fig.13 for Fig.12 A schematic diagram of a first branch in a first flow path shown;

[0036] Fig.14 for Fig.12 A schematic diagram of a second branch in a first flow path shown;

[0037] Fig.15 for Fig.12 The schematic diagram of the flow direction of the refrigerant in the first flow path in the heating mode is shown;

[0038] Fig.16 for Fig.12 The schematic diagram of the flow direction of the refrigerant in the first flow path in the cooling mode is shown;

[0039] Fig.17 A schematic diagram of a fin heat exchanger according to an embodiment.

[0040] Among them, there are a two-way joint 1, a three-way joint 2, a heat dissipation pipe 3, a first branch 01, a second branch 02, a third branch 03, a fourth branch 04, a fifth branch 05, a sixth branch 06, and an air collecting pipe 4. DETAILED DESCRIPTION

[0041] It should be clear that the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the embodiments of the present application.

[0042] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the embodiments of the present application. The singular forms of "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0043] When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims. In the description of the present application, it is to be understood that the terms "first", "second", "third", etc. are only used to distinguish similar objects, and do not have to be used to describe a specific order or sequence, nor can they be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0044] In addition, in the description of this application, unless otherwise specified, "plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects are in an "or" relationship.

[0045] It should be understood that the embodiments of the present application are not limited to the precise structures described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the embodiments of the present application is limited only by the appended claims.

[0046] See also Figure 1 This embodiment provides a finned heat exchanger flow path, including 9 first flow paths arranged in sequence from top to bottom, specifically, including 3 types of first flow paths, the top first flow path is shown in FIG. Figure 2 , please refer to the first flow path at the bottom Fig.12 For the remaining 7 first flow paths, please refer to Figure 7 In other embodiments, the plurality of first flow paths included in the flow path of the finned heat exchanger may also be Figure 2 The first flow path of the corresponding embodiment, Figure 7 The first flow path of the corresponding embodiment and Fig.12 One or more components of various first flow paths such as the first flow path of the corresponding embodiment.

[0047] See also Figure 2 to Figure 6The first flow path includes three two-way joints 1, a three-way joint 2 and six heat dissipation pipes 3. The heat dissipation pipe 3 of the present embodiment is U-shaped. Specifically, the heat dissipation pipe 3 of the present utility model embodiment is formed by a U-shaped two-way joint and two straight pipes respectively connected to the two ends of the U-shaped two-way joint and are integrally formed. In other embodiments, the heat dissipation pipe 3 can also be composed of a U-shaped two-way joint and two straight pipes respectively connected to the two ends of the U-shaped two-way joint. The pipe orifice described in the embodiment of the utility model is usually based on the description of the U-shaped heat dissipation pipe 3 as a whole. Therefore, a heat dissipation pipe 3 of the embodiment of the utility model is usually only provided with two Pipe orifice; the three interfaces of the three-way joint 2 of the first flow path are respectively connected to one end of the three heat dissipation pipes 3, and the other ends of the three heat dissipation pipes 3 are respectively connected to one heat dissipation pipe 3 through the two-way joint 1, so as to form two branches of the first flow path. It should be noted that in the first flow path of the embodiment of the utility model, the branch is composed of a main path and a branch path, the main path is a part shared by all branches, and the branch path is a part unique to each branch path; the two branches have a common main path, that is, the two branches both include the part of the first flow path located before the inlet of the three-way joint, and the two branches also have two branches belonging to each other, that is, the two branches respectively include two parts of the first flow path located after the two outlets of the three-way joint; please refer to Figure 3 and Figure 4 The two branches of the first flow path include the first branch 01 and the second branch 02. The first branch 01 and the second branch 02 are respectively provided with 8 pipe openings. The three-way joint 2 is arranged at the 4th pipe opening after the refrigerant inlet of the first flow path. The refrigerant inlet described in the utility model generally refers to the pipe opening used when the refrigerant flows from the previous system component (such as the gas collecting pipe, the liquid distributing pipe, the electronic expansion valve, etc.) into the first flow path during the refrigeration process. The refrigerant outlet generally refers to the pipe opening when the refrigerant flows out from the first flow path to the next system component. Please refer to Figure 5 During the heating process, liquid refrigerant enters from the refrigerant inlet and exchanges heat in the heat exchange tube, absorbing heat and heating up. When it flows through the three-way joint 2, the liquid refrigerant turns into gaseous refrigerant, and its density decreases and its volume increases. At the same time, the flow path is divided from a single flow path into two flow paths. On the one hand, the overall flow resistance of the refrigerant is reduced, which is conducive to evaporation heat exchange. On the other hand, it can better cooperate with the changes of the two phases of the refrigerant, so that the refrigerant can evaporate into gas more fully, improving the heating capacity. Please refer to Figure 6In the refrigeration process, the gaseous refrigerant enters from the two branches and exchanges heat in the heat exchange tube, releasing heat and cooling. When flowing through the three-way joint 2, the gaseous refrigerant is transformed into liquid refrigerant, the density increases and the volume decreases. At the same time, the flow path is also gathered from the two flow paths to a single flow path, which increases the overall flow resistance of the refrigerant and increases the flow rate of the refrigerant, which is conducive to condensation and heat absorption. On the other hand, it can better cooperate with the change of the two phases of the refrigerant, so that the refrigerant is more fully condensed into liquid, and the refrigeration capacity is improved. The total length of the two branches of the first flow path is represented by L. The three-way joint 2 of the first flow path is located at 1 / 2L. This setting can improve the refrigeration performance and heating performance at the same time. It should be noted that L in the embodiment of the utility model usually refers to the length of the flow path when the refrigerant inlet of a certain branch is taken as the starting point and the refrigerant outlet of the same branch is taken as the end point. That is, the flow path length of a main road and a branch road of the same branch is L; it does not refer to the total length of a main road and two branches of two branches.

[0048] See also Figure 7 to Figure 11 The first flow path includes two two-way joints 1, a three-way joint 2 and five heat dissipation pipes 3. The heat dissipation pipes 3 of this embodiment are U-shaped. The three interfaces of the three-way joint 2 are respectively connected to one end of the three heat dissipation pipes 3. Two heat dissipation pipes 3 are connected to the remaining two heat dissipation pipes 3 through the two-way joint 1 to form two branches of the first flow path. Please refer to Figure 8 and Fig. 9 The two branches of this embodiment include the third branch 03 and the fourth branch 04. The third branch 03 and the fourth branch 04 are respectively provided with 6 pipe openings. The three-way joint 2 is provided at the second pipe opening after the refrigerant inlet of the first flow path. The refrigerant inlet is a pipe opening shared by the two branches. Fig.10 During the heating process, liquid refrigerant enters from the refrigerant inlet and exchanges heat in the heat exchange tube, absorbing heat and heating up. When it flows through the three-way joint 2, the liquid refrigerant turns into gaseous refrigerant, and its density decreases and its volume increases. At the same time, the flow path is divided from a single flow path into two flow paths. On the one hand, the overall flow resistance of the refrigerant is reduced, which is conducive to evaporation heat exchange. On the other hand, it can better cooperate with the changes of the two phases of the refrigerant, so that the refrigerant can evaporate into gas more fully, improving the heating capacity. Please refer to Fig.11In the refrigeration process, the gaseous refrigerant enters from the two branches and exchanges heat in the heat exchange tube, releasing heat and cooling down. When flowing through the three-way joint 2, the gaseous refrigerant is transformed into liquid refrigerant, the density increases and the volume decreases. At the same time, the flow path is also converged from the two flow paths to a single flow path. On the one hand, the overall flow resistance of the refrigerant is increased, and the refrigerant flow rate is increased, which is conducive to condensation and heat absorption. On the other hand, it can better cooperate with the changes in the two phases of the refrigerant, so that the refrigerant can be more fully condensed into liquid, thereby improving the refrigeration capacity. The total length of the two branches of the first flow path is represented by L. The three-way joint 2 of this first flow path is located at 1 / 3L. This first flow path is relatively more suitable for scenes with good wind fields. In scenes with good wind fields, the refrigerant will evaporate in advance. Setting the three-way joint 2 at the second pipe mouth after the refrigerant inlet of the first flow path can better ensure the heating process.

[0049] See also Figure 12 to Figure 16 The first flow path includes four two-way joints 1, one three-way joint 2 and seven heat dissipation tubes 3. The heat dissipation tubes 3 of this embodiment are U-shaped. The three interfaces of the three-way joint 2 are respectively connected to one end of the three heat dissipation tubes 3. For the three heat exchange tubes mentioned above, the other end of one heat exchange tube is connected to two heat exchange tubes through the two-way joint 1, and two heat dissipation tubes 3 are respectively connected to one heat dissipation tube 3 through the two-way joint 1, forming two branches of the first flow path. Please refer to Fig.13 and Fig.14 The two branches of this embodiment include the fifth branch 05 and the sixth branch 06. The fifth branch 05 and the sixth branch 06 are respectively provided with 10 pipe openings. The three-way joint 2 is provided at the sixth pipe opening after the refrigerant inlet of the first flow path. The refrigerant inlet is a pipe opening shared by the two branches. Fig.15 During the heating process, liquid refrigerant enters from the refrigerant inlet and exchanges heat in the heat exchange tube, absorbing heat and heating up. When it flows through the three-way joint 2, the liquid refrigerant turns into gaseous refrigerant, and its density decreases and its volume increases. At the same time, the flow path is divided from a single flow path into two flow paths. On the one hand, the overall flow resistance of the refrigerant is reduced, which is conducive to evaporation heat exchange. On the other hand, it can better cooperate with the changes of the two phases of the refrigerant, so that the refrigerant can evaporate into gas more fully, improving the heating capacity. Please refer to Fig.16In the refrigeration process, the gaseous refrigerant enters from the two branches and exchanges heat in the heat exchange tube, releasing heat and cooling down. When flowing through the three-way joint 2, the gaseous refrigerant is transformed into liquid refrigerant, the density increases and the volume decreases. At the same time, the flow path is also converged from the two flow paths to a single flow path. On the one hand, the overall flow resistance of the refrigerant is increased, and the refrigerant flow rate is increased, which is conducive to condensation and heat absorption. On the other hand, it can better cooperate with the changes in the two phases of the refrigerant, so that the refrigerant can be more fully condensed into liquid, thereby improving the refrigeration capacity. The total length of the two branches of the first flow path is represented by L. The three-way joint 2 of this first flow path is located at 2 / 3L. This first flow path is relatively more suitable for scenes with poor wind fields. In scenes with poor wind fields, the refrigerant will delay evaporation. Setting the three-way joint 2 at the sixth pipe mouth after the refrigerant inlet of the first flow path can better ensure the heating process.

[0050] For any embodiment, the spacing between the heat exchange tubes can be adjusted between 21 and 25 mm, and the inner diameter of the heat exchange tubes can be selected between 5 and 12 mm.

[0051] On the other hand, the utility model further provides a fin heat exchanger, comprising the fin heat exchanger flow path described in any of the above embodiments.

[0052] See also Fig.17The present embodiment provides a fin heat exchanger, including a fin heat exchanger flow path, the fin heat exchanger flow path includes 12 first flow paths, the first flow paths include three two-way joints 1, a three-way joint 2 and 6 heat dissipation tubes 3, the heat dissipation tube 3 of the present embodiment is U-shaped, the three interfaces of the three-way joint 2 are respectively connected to one end of the three heat dissipation tubes 3, and the other ends of the three heat dissipation tubes 3 are respectively connected to one heat dissipation tube 3 through the two-way joint 1, forming two branches of the first flow path; the fin heat exchanger of the present embodiment also includes 12 first flow paths, 12 liquid separation capillaries, 12 heat shrink tubes, a gas collecting pipe 4, a first end plate, a second end plate and a plurality of fins. The 12 liquid separation capillaries are respectively connected to the 12 groups of first flow paths at the refrigerant inlet, the inner diameter of the liquid separation capillary is 3.2mm, the outer diameter of the liquid separation capillary is 4.2mm, and the length of the liquid separation capillary is 620mm~1060mm; the heat shrink tube is sleeved outside the liquid separation capillary, and the length of the heat shrink tube is 570mm~1010mm; the gas collecting pipe 4 is connected to the two branches of the first flow path, the first end plate and the second end plate are respectively fixed on the two ends of the heat exchange tube, the fin sleeve is arranged on the flow path of the fin type heat exchanger, and a plurality of fins are arranged in parallel along the extension direction of the first heat exchange tube. In this embodiment, in order to make the temperature of each flow path similar and ensure the overall heat exchange effect, the lengths of the 12 liquid separation capillaries are 700mm, 620mm, 620mm, 740mm, 800mm, 820mm, 880mm, 920mm, 980mm, 1010mm, 1060mm, and 1060mm from top to bottom. After testing, the finned heat exchanger using this design has a good heat exchange effect during actual operation, and each flow path is very uniform and close. In order to keep the refrigerant in the liquid separation capillary tubes warm, the lengths of the 12 heat shrink tubes in this embodiment are 650mm, 570mm, 570mm, 690mm, 720mm, 770mm, 830mm, 880mm, 930mm, 960mm, 1010mm, and 1010mm from top to bottom.

[0053] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0054] ① During the heating process, the liquid refrigerant enters from the refrigerant inlet and performs heat exchange in the heat exchange tube, absorbing heat and heating up. When it flows through the three-way joint 2, the liquid refrigerant is transformed into a gaseous refrigerant, and the density decreases and the volume increases. At the same time, the flow path is also divided from a single flow path into two flow paths. On the one hand, the overall flow resistance of the refrigerant is reduced, which is conducive to evaporation heat exchange. On the other hand, it can better cooperate with the change of the two phases of the refrigerant, so that the refrigerant can evaporate into a gaseous state more fully, thereby improving the heating capacity;

[0055] ② During the refrigeration process, the gaseous refrigerant enters from the two branches and performs heat exchange in the heat exchange tube, releasing heat and cooling down. When flowing through the three-way joint 2, the gaseous refrigerant is transformed into liquid refrigerant, the density increases and the volume decreases. At the same time, the flow path is also merged from the two flow paths to a single flow path. On the one hand, the overall flow resistance of the refrigerant is increased, and the refrigerant flow rate is increased, which is conducive to condensation and heat absorption. On the other hand, it can better cooperate with the changes of the two phases of the refrigerant, so that the refrigerant can be more fully condensed into liquid, thereby improving the refrigeration capacity;

[0056] ③ Set the three-way connector 2 between 0.3L and 0.8L to improve both cooling and heating performances, and be able to cope with situations with good and poor wind fields; if the three-way connector 2 is set to a position less than 0.3L, during the heating process, the refrigerant will not evaporate completely and will be in a liquid refrigerant state. At this time, the one-to-two split will easily lead to a slower flow rate and a poorer heat exchange evaporation effect; if the three-way connector 2 is set to a position greater than 0.8L, during the cooling process, the refrigerant will not be fully condensed and most of the refrigerant will be in a gaseous state. At this time, the two-to-one split will cause liquid refrigerant to accumulate in the pipeline, affecting the defrosting effect.

[0057] ④ By setting the separation capillary, the temperature of the flow path is adjusted to ensure the overall heat exchange effect; further, by limiting the length of the separation capillary, the temperature of each flow path is made similar to ensure the overall heat exchange effect.

[0058] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, and the utility model is also intended to include these modifications and modifications.

Claims

1. A fin heat exchanger flow path, characterized in that: It includes multiple first flow paths, which include multiple two-way joints, one three-way joint and multiple heat exchange tubes. The multiple two-way joints, one three-way joint and multiple heat exchange tubes form two branches of the first flow path. The total length of any branch is L, and the three-way joint is located between 0.3L and 0.8L.

2. A fin heat exchanger flow path according to claim 1, characterized in that: The two branches include a first branch and a second branch, the first branch and the second branch have 8 pipe openings respectively, and the inlet of the three-way joint is arranged at the 4th pipe opening after the refrigerant inlet of the first flow path.

3. The fin heat exchanger flow path according to claim 1, characterized in that: The two branches include a third branch and a fourth branch, the third branch and the fourth branch have 6 pipe openings respectively, and the inlet of the three-way joint is arranged at the second pipe opening after the refrigerant inlet of the first flow path.

4. The fin heat exchanger flow path according to claim 1, characterized in that: The two branches include a fifth branch and a sixth branch, the fifth branch and the sixth branch have 10 pipe openings respectively, and the inlet of the three-way joint is arranged at the sixth pipe opening after the refrigerant inlet of the first flow path.

5. The fin heat exchanger flow path according to claim 1, characterized in that: Among the plurality of the first flow paths, the plurality of the two branches include one or more of a first branch and a second branch, a third branch and a fourth branch, a fifth branch and a sixth branch.

6. A finned heat exchanger, characterized in that: The invention comprises a fin heat exchanger flow path as described in any one of claims 1 to 5.

7. The finned heat exchanger according to claim 6, characterized in that: It also includes an air collecting pipe, a first end plate, a second end plate and a plurality of fins. The air collecting pipe is connected to the two branches of the first flow path. The first end plate and the second end plate are respectively fixed on the two ends of the heat exchange tube. The fins are sleeved on the fin-type heat exchanger flow path. The plurality of fins are arranged in parallel along the extension direction of the heat exchange tube.

8. The finned heat exchanger according to claim 6, characterized in that: The spacing between the heat exchange tubes is 21-25 mm, and the inner diameter of the heat exchange tubes is 5-12 mm.

9. The finned heat exchanger according to claim 6, characterized in that: It also includes a liquid separation capillary, which is connected to the first flow path, has an inner diameter of 3.2 mm, an outer diameter of 4.2 mm, and a length of 620 mm to 1060 mm.

10. The finned heat exchanger according to claim 9, characterized in that: It also includes a heat shrink tube, which is sleeved outside the liquid separation capillary and has a length of 570 mm to 1010 mm.

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