Heat exchanger and refrigeration equipment

Abstract

The utility model relates to the technical field of heat exchangers, and discloses a heat exchanger which comprises a heat exchange pipe set, a first heat exchange pipe, a second heat exchange pipe and n heat exchange branches connected between the first external pipe and the second external pipe in parallel, and n is larger than or equal to 2; the supercooling one-way conduction device is arranged on the first external connection pipe and is configured to be in one-way conduction from the first external connection pipe to the heat exchange pipe set; the supercooling pipe group comprises m supercooling pipes, and the supercooling pipe group and the supercooling one-way conduction device are arranged on the first external connection pipe in parallel; the super-cooling pipe group meets the following relation: M is the number of main pipes of the heat exchanger. The supercooling pipe set of the heat exchanger provided by the embodiment of the utility model meets the specific quantitative relation with the number of the main pipes and the number of the heat exchange branches of the heat exchanger, so that the supercooling effect in the use state of a condenser can be ensured, meanwhile, the cold energy distribution in the use state of an evaporator can be more uniform, and the overall frosting distribution of the heat exchanger is more uniform. The utility model further discloses the refrigeration equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat exchangers, for example to a heat exchanger and a refrigeration device. BACKGROUND

[0002] Air conditioner energy efficiency standards are important indicators for measuring the energy efficiency of air conditioning equipment, and are one of the main reference factors for consumers when purchasing air conditioning products. Although air conditioners with high energy efficiency levels may have higher initial purchase costs, they can save more electricity and reduce electricity costs in the long run, thereby reducing the daily use costs of consumers. Based on this market demand, domestic air conditioner manufacturers are actively improving the form of air conditioners, and improving the actual energy efficiency of air conditioners by applying compressor frequency conversion technology, self-cleaning technology, and outdoor unit defrosting technology.

[0003] As a core component of air conditioning products, the heat exchange efficiency of the heat exchanger will also directly affect the actual energy efficiency of the air conditioner. At present, some air conditioning products have an overcooling pipe section added to the heat exchanger. The overcooling pipe section can expand the refrigerant flow path length of the heat exchanger, prolong the heat exchange time between the refrigerant and the external environment, and thereby enhance the condensation heat dissipation efficiency of the heat exchanger when used as a condenser.

[0004] In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:

[0005] In order to improve the overcooling effect of the overcooling pipe section, the related art often provides the overcooling pipe section with a large number of overcooling pipes, and the overcooling process is long. Although this form can improve the refrigerant overcooling degree, it is easy to cause uneven distribution of cold energy of the heat exchanger in the winter heating mode, resulting in excessive frosting in a local part of the heat exchanger, and affecting the working efficiency of the air conditioner in the heating mode.

[0006] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present application, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. Content of the utility model

[0007] In order to have a basic understanding of some aspects of the disclosed embodiments, the following is a simple summary. The summary is not a general review, nor is it intended to determine the key / important constituent elements or delineate the scope of protection of these embodiments, but as a prelude to the detailed description below.

[0008] The embodiments of the present disclosure provide a heat exchanger and a refrigeration device, aiming to solve the technical problem that the overcooling section design of the heat exchanger in the related art cannot balance the overcooling and frost prevention requirements.

[0009] According to a first aspect of the present utility model, a heat exchanger is provided, comprising:

[0010] The heat exchange pipe group comprises a first external pipe, a second external pipe, and n heat exchange branches connected in parallel between the first external pipe and the second external pipe, wherein n≥2;

[0011] The supercooling one-way conducting device is arranged on the first external pipe and is configured to conduct in one direction from the first external pipe to the heat exchange pipe group;

[0012] The supercooling pipe group comprises m supercooling pipes, and the supercooling pipe group is arranged in parallel with the supercooling one-way conducting device on the first external pipe; the supercooling pipe group satisfies the following relationship:

[0013]

[0014] Wherein, M is the total number of pipes of the heat exchanger.

[0015] In some embodiments, the heat exchange branch comprises a first branch, …, and an n-th branch arranged in sequence from top to bottom with respect to the heat exchanger;

[0016] Wherein, the first branch comprises m' heat exchange pipes, and the first branch and the supercooling pipe group satisfy the pipe number relationship: m'=m.

[0017] In some embodiments, the heat exchange branch comprises a first branch, …, and an n-th branch arranged in sequence from top to bottom with respect to the heat exchanger;

[0018] Wherein, the supercooling pipe group and the first branch satisfy the pipe diameter relationship: R1

[0019] In some embodiments, the outer diameter R1 of the supercooling pipe of the supercooling pipe group ranges from 3mm to 5mm.

[0020] And / or, the outer diameter R2 of the heat exchange pipe of the first branch ranges from 7mm.

[0021] In some embodiments, the number m of the supercooling pipes ranges from 4 to 10.

[0022] In some embodiments, the type of the supercooling one-way conducting device comprises a one-way valve or a control valve.

[0023] In some embodiments, the n heat exchange branches comprise a first branch, a second branch, and a third branch arranged in sequence;

[0024] The heat exchange pipe group further comprises:

[0025] The first one-way conducting device is connected at one end to the pipe end of the corresponding second external pipe of the first branch and at the other end to the pipe end of the corresponding second external pipe of the second branch, and is configured to conduct in one direction from the pipe end of the second branch to the pipe end of the first branch;

[0026] The second one-way conducting device is connected at one end to the pipe end of the second branch corresponding to the first external pipe and at the other end to the pipe end of the third branch corresponding to the first external pipe, and is configured to conduct in one direction from the pipe end of the third branch to the pipe end of the second branch.

[0027] In some embodiments, the first branch includes one or more first heat exchange sub-branches, wherein the plurality of first heat exchange sub-branches are arranged in parallel with each other; and / or,

[0028] The second branch includes one or more second heat exchange sub-branches, wherein the plurality of second heat exchange sub-branches are arranged in parallel with each other; and / or,

[0029] The third branch includes one or more third heat exchange sub-branches, wherein the plurality of third heat exchange sub-branches are arranged in parallel with each other.

[0030] According to a second aspect of the present application, there is also provided a refrigeration device, comprising a device main body, and a heat exchanger as shown in any one of the embodiments of the first aspect.

[0031] In some embodiments, the type of the refrigeration device is an air conditioner, and the heat exchanger is an outdoor heat exchanger of the air conditioner

[0032] The heat exchanger and the refrigeration device provided by the embodiments of the present application can achieve the following technical effects:

[0033] The heat exchanger provided by the embodiments of the present application is composed of a heat exchange pipe group and a supercooling pipe group; wherein the supercooling pipe group is connected to the heat exchange pipe group through a one-way conducting device, and can play a role of supercooling refrigerant when the heat exchanger is used as a condenser; in addition, the number m of supercooling pipes of the supercooling pipe group satisfies a specific number relationship with the total number of pipes and the number of heat exchange branches of the heat exchanger, so that the supercooling effect can be ensured in the "condenser" use state, and the cold distribution can be more uniform in the "evaporator" use state, and the frost distribution of the heat exchanger as a whole is more uniform.

[0034] The foregoing general description and the following description are only exemplary and explanatory, and are not used to limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0035] One or more embodiments are exemplarily illustrated by corresponding drawings, which do not constitute limitation on the embodiments, and elements with the same reference numerals in the drawings are shown as similar elements, the drawings do not constitute proportional limitation, and wherein:

[0036] Figure 1 is a schematic diagram of a heat exchanger provided by the embodiments of the present application;

[0037] Figure 2is a schematic diagram of a refrigeration cycle system provided in an embodiment of the present disclosure;

[0038] Figure 3a is a flow path schematic diagram when the heat exchanger is used as a "condenser" in an embodiment of the present disclosure;

[0039] Figure 3b is a flow path schematic diagram when the heat exchanger is used as an "evaporator" in an embodiment of the present disclosure;

[0040] Figure 4a is a flow path schematic diagram when the heat exchanger is used as a "condenser" in another embodiment of the present disclosure;

[0041] Figure 4b is a flow path schematic diagram when the heat exchanger is used as an "evaporator" in another embodiment of the present disclosure;

[0042] Figure 5 is a structural schematic diagram of a refrigeration device provided in an embodiment of the present disclosure.

[0043] Reference signs:

[0044] 10, heat exchanger; 11, first heat exchanger; 12, second heat exchanger;

[0045] 110, heat exchange tube group; 111, first branch; 112, second branch; 113, third branch; 121, first external connection pipe; 122, second external connection pipe;

[0046] 200, supercooling tube group;

[0047] 310, supercooling one-way conducting device; 321, first one-way conducting device; 322, second one-way conducting device;

[0048] 40, refrigeration device; 41, outdoor heat exchanger. DETAILED DESCRIPTION

[0049] In order to enable a person skilled in the art to more fully understand the features and technical contents of the embodiments of the present disclosure, the implementation of the embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings, which are used for reference only and do not limit the embodiments of the present disclosure. In the following technical description, in order to facilitate explanation, a plurality of details are provided to provide a full understanding of the disclosed embodiments. However, one or more embodiments can still be implemented without these details. In other cases, in order to simplify the drawings, well-known structures and devices can be simplified.

[0050] The terms "first", "second", and the like in the description and in the claims of the embodiments of the present disclosure and the above drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so as to describe the embodiments of the present disclosure herein. In addition, the terms "comprise" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0051] In the embodiments of the present disclosure, the terms "upper", "lower", "inner", "middle", "outer", "front", "back", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the embodiments of the present disclosure and the embodiments thereof, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to indicating the orientation or positional relationship, the above-mentioned part of the terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain dependent relationship or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in the embodiments of the present disclosure can be understood according to the specific circumstances.

[0052] In addition, the terms "set", "connected", "fixed" should be broadly understood. For example, "connected" can be fixed connection, detachable connection, or integral structure; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium, or internal communication between two devices, elements or components. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to the specific circumstances.

[0053] Unless otherwise specified, the term "a plurality of" means two or more.

[0054] In the embodiments of the present disclosure, the character " / " represents an "or" relationship between the preceding and following objects. For example, A / B means A or B.

[0055] The term "and / or" is a description of the association relationship between objects, which means that there can be three relationships. For example, A and / or B means: A or B, or, A and B, the three relationships.

[0056] It should be noted that the embodiments in the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0057] The application provides a heat exchanger 10 which can be applied to a refrigeration device as a heat exchange component, and can be particularly used for heat exchange between refrigerant flowing through the heat exchanger 10 and air in a corresponding heat exchange region of the heat exchanger 10, so as to realize the function of heating and temperature rising or heat absorption and temperature lowering of the heat exchange region. Optionally, the type of the refrigeration device 40 includes but is not limited to an air conditioner, a refrigerator, a freezer, a dehumidifier and the like; and correspondingly, the application form of the heat exchanger 10 includes but is not limited to the function form of being used as an “evaporator” or a “condenser”.

[0058] In combination Figures 1 to 5 As shown in the drawings, the heat exchanger 10 provided by the embodiment of the present disclosure at least includes a heat exchange pipe group 110, a supercooling pipe group 200 and a supercooling one-way conduction device 310. The heat exchange pipe group 110 includes a plurality of heat exchange pipes made of a heat-conducting material and serving as a path for refrigerant flowing through the heat exchanger 10, so that the refrigerant exchanges heat with the environment outside the heat exchange pipes during flowing through the heat exchange pipes, and the refrigerant can realize heat absorption or heat release to the outside through the heat conduction of the heat exchange pipes. The supercooling pipe group 200 includes a plurality of supercooling pipes made of a heat-conducting material and connected with the flow path of the heat exchange pipe group 110, so that the refrigerant can also exchange heat with the environment outside the supercooling pipes. The supercooling one-way conduction device 310 is used to connect the supercooling pipe group 200 in parallel with the external pipe of the heat exchange pipe group 110, and is used to limit the refrigerant to flow into the supercooling pipe group 200 for further supercooling heat dissipation after heat exchange in the heat exchange pipe group 110 when the heat exchanger 10 is used as a “condenser”, and is used to divide the refrigerant into the heat exchange pipe group 110 and the supercooling pipe group 200 for heat exchange when the heat exchanger 10 is used as an “evaporator”.

[0059] In optional embodiments, the type of the heat exchanger 10 includes but is not limited to a finned tube heat exchanger, a plate heat exchanger, a micro-channel heat exchanger and the like. The following embodiments are mainly exemplarily described in the type of “finned tube heat exchanger”.

[0060] Specifically, the heat exchange pipe group 110 in the embodiment includes a first external pipe 121, a second external pipe 122 and a plurality of heat exchange branches, the plurality of heat exchange branches are arranged in parallel with each other between the first external pipe 121 and the second external pipe 122, and a plurality of parallel heat exchange flow paths can be formed, so as to accelerate the heat exchange efficiency of the refrigerant and reduce the local pressure caused by the concentration of the refrigerant.

[0061] Here, the first external pipe 121 and the second external pipe 122 are pipes for connecting the heat exchanger 10 with external pipes. Exemplarily, Figure 2A schematic diagram of a refrigeration cycle system applied to a refrigeration device is shown, which mainly comprises a compressor, a first heat exchanger 11, a second heat exchanger 12, a four-way valve and a throttling device, wherein the first heat exchanger 11 is the embodiment shown in the foregoing embodiment, the first external connecting pipe 121 of the heat exchanger 10 is used to connect the pipe close to the side of the second heat exchanger 12, and the second external connecting pipe 122 is used to connect the pipe close to the side of the second heat exchanger 12. Further, the refrigeration cycle system has a refrigeration cycle flow direction and a heating cycle flow direction, wherein in the refrigeration cycle flow direction, the first heat exchanger 11 is used as a “condenser”, in which case the first external connecting pipe 121 is used as the refrigerant outflow pipe of the heat exchanger 10, and the second external connecting pipe 122 is used as the refrigerant inflow pipe of the heat exchanger 10; similarly, in the heating cycle flow direction, the first heat exchanger 11 is used as an “evaporator”, in which case the first external connecting pipe 121 is used as the refrigerant inflow pipe of the heat exchanger 10, and the second external connecting pipe 122 is used as the refrigerant outflow pipe of the heat exchanger 10.

[0062] In some optional embodiments, the number of heat exchange branch circuits of the heat exchange pipe group 110 is n, wherein n≥2. Optionally, n is 2, 3, 4, 7, 10, etc. Here, the value of n is associated with the design heat exchange capacity of the heat exchanger 10, and the two are positively correlated, that is, the greater the heat exchange capacity of the heat exchanger 10, the greater the value of the number n of heat exchange branch circuits corresponding to the heat exchanger 10. For example, for the heat exchanger 10 applied to an air conditioner, the value of the number n of heat exchange branch circuits corresponding to the heat exchanger 10 of a 1P air conditioner ranges from 2 to 4, the value of the number n of heat exchange branch circuits corresponding to the heat exchanger 10 of a 1.5P air conditioner ranges from 3 to 6, etc. Figure 1 In the heat exchanger 10 shown in the embodiment, the number n of heat exchange branch circuits is 4.

[0063] In the embodiment, each heat exchange branch circuit comprises a plurality of heat exchange pipes as described above.

[0064] Optionally, the heat exchange pipes in the same heat exchange branch circuit are connected in series to form a series refrigerant flow path; alternatively, the heat exchange pipes in the same heat exchange branch circuit can also be connected in parallel, thereby forming a parallel refrigerant flow path in the heat exchange branch circuit; alternatively, the heat exchange pipes in the same heat exchange branch circuit can also be connected in a combination of series and parallel, for example, the heat exchange pipes upstream of the flow path in the same heat exchange branch circuit are connected in parallel, and the heat exchange pipes upstream and downstream of the flow path in the same heat exchange branch circuit are connected in series, etc., which is not limited in the present application. Figure 1 In the heat exchanger shown in the embodiment, the heat exchange pipes in the same heat exchange branch circuit are mainly connected in series, which has a simple structure design and low manufacturing process difficulty.

[0065] In some alternative embodiments, for the spatial arrangement of the plurality of heat exchange tubes of the same heat exchange branch, alternatively, from the perspective of the longitudinal cross section of the heat exchanger 10, the plurality of heat exchange tubes are arranged in an approximate "I" shape flow path arrangement; or, the plurality of heat exchange tubes are arranged in a side-by-side flow path arrangement, as shown in Figure 1 The present application is not limited thereto.

[0066] In Figure 1 The plurality of heat exchange branches are arranged in a vertical sequence from top to bottom, which are defined as the first branch 111,..., the nth branch for the sake of distinction. The left side ports of the plurality of heat exchange branches are connected in parallel to the second external connection pipe 122, and the right side ports of the plurality of heat exchange branches are connected in parallel to the first external connection pipe 121.

[0067] In some embodiments, the number of heat exchange tubes of different heat exchange branches is the same, for example, the number of heat exchange tubes of each heat exchange branch is 4, 6, etc., so as to achieve uniform distribution of refrigerant and uniformity of heat exchange. In yet some embodiments, the number of heat exchange tubes of different heat exchange branches is not the same, for example, the number of heat exchange tubes of the heat exchange branch located at the upper space is more than that of the heat exchange branch located at the lower space, such as the number of heat exchange tubes of the first branch 111 is 8, and the number of heat exchange tubes of the nth heat exchange branch is 4; or, the number of heat exchange tubes of the heat exchange branch located at the upper space is less than that of the heat exchange branch located at the lower space, such as the number of heat exchange tubes of the first branch 111 is 2, and the number of heat exchange tubes of the nth branch is 6. In this way, by adjusting the number of heat exchange tubes of different heat exchange branches, the refrigerant flow path distribution of the space of the heat exchanger 10 can be adjusted, so as to achieve the purpose of reducing the frost amount at the bottom of the heat exchanger 10, increasing the heat exchange amount at the upper space, etc.

[0068] In some embodiments, the supercooling tube group 200 is connected in parallel to the first external connection pipe 121 through the supercooling one-way conduction device 310, as shown in Figure 1 Here, the supercooling one-way conduction device 310 is configured to conduct in one direction from the first external connection pipe 121 to the heat exchange tube group 110, so that in the case that the refrigerant flows from the heat exchange tube group 110 to the first external connection pipe 121, the supercooling one-way conduction device 310 is in a closed state, and the refrigerant flow path is blocked, so that the refrigerant needs to pass through the supercooling tube group 200 to continue to flow to the first external connection pipe 121.

[0069] In some embodiments, the supercooling one-way conduction device 310 is a check valve, as shown in Figure 3aThe refrigerant flow path when the heat exchanger 10 is used as a "condenser" is shown. The refrigerant flows into the heat exchange pipe group 110 from the second external connection pipe 122, is then divided into four heat exchange branches to exchange heat, and then is recombined. At this time, the supercooling one-way conduction device 310 is in a closed state, so the recombined refrigerant flows into the supercooling pipe of the supercooling pipe group 200 to continue to exchange heat with the outside, thereby further cooling the refrigerant to achieve the "supercooling" effect. Figure 3b The refrigerant flow path when the heat exchanger 10 is used as an "evaporator" is shown. The refrigerant flows into the heat exchange pipe group 110 from the first external connection pipe 121, a part of the refrigerant flows into the supercooling pipe group 200 to exchange heat, and then reflows into the first external connection pipe 121. Another part of the refrigerant flows into the multiple heat exchange branches of the heat exchange pipe group 110 to exchange heat, and then reflows and flows out of the heat exchanger 10 through the second external connection pipe 122. In this flow path form, the refrigerant is evaporated and absorbs heat from the outside through multiple parallel flow paths, and the heat exchange efficiency is high.

[0070] In Figure 1 In the embodiment shown, the supercooling pipe group 200 is arranged at a position below the space of the heat exchanger 10, and when the heat exchanger 10 is used as an "evaporator", the supercooling pipe group 200 also evaporates and absorbs heat from the outside. Therefore, in order to avoid the problem of excessive frost condensation in a local part of the supercooling pipe group 200, the number of supercooling pipes of the supercooling pipe group 200 satisfies the following relationship:

[0071]

[0072] Wherein m is the number of supercooling pipes, and M is the total number of pipes of the heat exchanger 10. Here, the total number of pipes of the heat exchange pipe is the sum of the number of supercooling pipes and the number of heat exchange pipes.

[0073] Through testing, the use of the supercooling pipe group 200 form satisfying the above number relationship can ensure sufficient supercooling of the refrigerant when the heat exchanger 10 is used as a "condenser", and can also reduce the problem of excessive frost condensation due to improper arrangement of the space number of the heat exchange pipes (the aforementioned heat exchanger 10 and supercooling pipes) of the heat exchanger 10.

[0074] For example, in an embodiment, the number of heat exchange branches n of the heat exchange pipe group 110 is 4, and the total number of pipes of the heat exchanger 10 is 30. According to the number relationship of the supercooling pipe group 200, the number of supercooling pipes n contained in the supercooling pipe group 200 can be determined as n = 30 / (4+1) = 6, that is, the number of supercooling pipes arranged in the heat exchanger 10 is 6.

[0075] Therefore, when designing the heat exchanger 10, if the number of the heat exchanger 10 and the corresponding total number of pipes are clear, the number of supercooling pipes of the supercooling pipe group 200 can be determined according to the above method.

[0076] Similarly, if the number of the heat exchanger 10 and the corresponding number of the total pipes are determined when designing the heat exchanger 10, and the number of the supercooling pipes is determined, the number of the heat exchange branch corresponding to the heat exchange pipe group 110 can also be calculated according to the above formula, for example, assuming that the total number of the pipes corresponding to the heat exchanger 10 of the 1.5P air conditioner is 24, and the number of the supercooling pipes is 6, the number of the heat exchange branch n of the heat exchange pipe group 110 can be calculated as 3.

[0077] In yet some optional embodiments, in order to further improve the uniformity of the refrigerant distribution, the number of the heat exchange pipes of the first branch 111 arranged at the uppermost space of the heat exchange pipe group 110 is the same as the number of the supercooling pipes of the supercooling pipe group 200 arranged at the lowermost space. For example, assuming that the number of the heat exchange pipes of the first branch 111 is m', and the number of the supercooling pipes is m, the above relationship can be expressed as m' = m, for example, the number of the supercooling pipes is 4, and the number of the heat exchange pipes of the first branch 111 of the heat exchange pipe group 110 is also 4.

[0078] In yet some optional embodiments, the size of the pipe diameter of the supercooling pipe group 200 will also affect the heat exchange efficiency of the heat exchanger 10, wherein if the pipe diameter of the supercooling pipe is too small, it may cause throttling effect on the flowing refrigerant, and further affect the refrigerant flow path and the heat exchange efficiency of the supercooling pipe group 200 when the heat exchanger 10 is used as an "evaporator"; and if the pipe diameter of the supercooling pipe is too large, it may cause refrigerant deflection and uneven distribution of heat exchange due to the proximity of the supercooling pipe to the first external pipe 121 as the inlet and outlet of the heat exchanger 10. In view of the above, the pipe diameter relationship of the supercooling pipe and the first branch 111 in the present embodiment is R1 < R2, wherein R1 is the outer diameter of the supercooling pipe of the supercooling pipe group 200, and R2 is the outer diameter of the heat exchange pipe of the first branch 111.

[0079] Optionally, the outer diameter R1 of the supercooling pipe of the supercooling pipe group 200 is in the range of 3mm≤R1≤5mm, for example, the specific value of the outer diameter R1 of the supercooling pipe is 3mm, 3.5mm, 4mm, 4.5mm, 5mm, etc. In yet another optional embodiment, the outer diameter R2 of the heat exchange pipe of the first branch 111 is in the range of R2≥7mm, for example, the specific value of the outer diameter R2 of the heat exchange pipe is 7mm, 8mm, 8.5mm, 9mm, etc.

[0080] In yet some optional embodiments, the type of the heat exchanger 10 is a variable split heat exchanger 10, that is, the flow path of the heat exchanger 10 is not the same when used as an "evaporator" and a "condenser", so that the heat exchanger 10 can achieve better heat exchange efficiency in both cooling and heating directions.

[0081] For example, in some embodiments, as shown in FIG. 1, the heat exchanger 10 is a variable split heat exchanger 10, that is, the flow path of the heat exchanger 10 is not the same when used as an "evaporator" and a "condenser", so that the heat exchanger 10 can achieve better heat exchange efficiency in both cooling and heating directions. Figure 4a and Figure 4bAs shown, the heat exchange tube group 110 of the heat exchanger 10 includes a first branch 111, a second branch 112 and a third branch 113 arranged in sequence, and the same side tube end (the left side tube end in the figure) of the three heat exchange branches is connected to the second external connection tube 122, and the other same side tube end (the right side tube end in the figure) is connected to the first external connection tube 121. In addition, the heat exchange tube group 110 further includes a first one-way conducting device 321 and a second one-way conducting device 322. One end of the first one-way conducting device 321 is connected to the tube end of the first branch 111 corresponding to the second external connection tube 122, and the other end is connected to the tube end of the second branch 112 corresponding to the second external connection tube 122, and it is configured to conduct in one direction from the tube end of the second branch 112 to the tube end of the first branch 111. One end of the second one-way conducting device 322 is connected to the tube end of the second branch 112 corresponding to the first external connection tube 121, and the other end is connected to the tube end of the third branch 113 corresponding to the first external connection tube 121, and it is configured to conduct in one direction from the tube end of the third branch 113 to the tube end of the second branch 112.

[0082] Meanwhile, in the present embodiment, the supercooling tube group 200 is connected in parallel to the first external connection tube 121 through the supercooling one-way conducting device 310, and the specific arrangement form can refer to the previous embodiment, which will not be repeated here.

[0083] In this way, in combination with the above-mentioned advantages of the heat exchanger 10, the heat exchanger 10 can be used as a “condenser” or a “evaporator”. Figure 4a As shown, the flow path diagram of the heat exchanger 10 when used as a “condenser” can be seen that the first branch 111, the second branch 112 and the third branch 113 can constitute a series type refrigerant flow path, and the refrigerant sequentially passes through each heat exchange branch for heat exchange, and the refrigerant flow process and the condensation heat exchange time are longer, and the refrigerant can achieve better supercooling degree. In combination with the above-mentioned advantages of the heat exchanger 10, the heat exchanger 10 can be used as a “condenser” or a “evaporator”. Figure 4b As shown, the flow path diagram of the heat exchanger 10 when used as a “evaporator” can be seen that the first branch 111, the second branch 112 and the third branch 113 can constitute a parallel type refrigerant flow path, and the refrigerant is respectively split into three heat exchange branches for heat exchange, and the refrigerant can be dispersed to evaporate and absorb heat from the external environment, and the heat exchange efficiency is higher.

[0084] In some embodiments, the number of the first branch 111 is one. In yet some embodiments, the number of the first branch 111 is multiple, which is defined as a first heat exchange sub-branch here, and multiple first heat exchange sub-branches are arranged in parallel with each other. Similarly, the second heat exchange branch can also include one or more second heat exchange sub-branches, and multiple second heat exchange sub-branches are arranged in parallel with each other. In addition, the third branch 113 can include one or more third heat exchange sub-branches, and multiple third heat exchange sub-branches are arranged in parallel with each other. By splitting the heat exchange branch into multiple heat exchange sub-branches, the actual branch flow path number of the heat exchange tube can be further expanded, so that the evaporation heat exchange efficiency of the heat exchanger 10 when used as a “evaporator” can be improved.

[0085] In the foregoing embodiments, the type of the supercooling one-way conducting device 310 includes but is not limited to a one-way valve or a control valve.

[0086] In the foregoing embodiments, the type of the supercooling one-way conducting device 310 includes but is not limited to a one-way valve or a control valve.

[0087] Similarly, the type of the first one-way conducting device 321 includes but is not limited to a one-way valve or a control valve. And, the type of the second one-way conducting device 322 includes but is not limited to a one-way valve or a control valve. The specific forms of the first one-way conducting device 321 and the second one-way conducting device 322 can refer to the supercooling one-way conducting device 310 in the foregoing embodiments, which will not be described here.

[0088] In yet some embodiments, the present application also discloses a refrigeration device 40. Optionally, the type of the refrigeration device 40 includes but is not limited to an air conditioner, a refrigerator, a freezer, etc.

[0089] Specifically, the refrigeration device 40 includes a device main body and the heat exchanger 10 as shown in the foregoing embodiments. Here, taking the type of the refrigeration device as an air conditioner for example, the above-mentioned heat exchanger can be an outdoor heat exchanger 41 of an outdoor unit of the air conditioner, as shown in Figure 5 and / or, an indoor heat exchanger of an indoor unit of the air conditioner. The refrigeration device 40 can effectively meet the working requirements of the heat exchanger 10 in different use states by adopting the heat exchanger 10 shown in the above-mentioned embodiments.

[0090] In the foregoing embodiments, the type of the air conditioner includes but is not limited to a wall-mounted air conditioner, a floor-standing air conditioner, a central air conditioner, a multi-connected air conditioner, a ducted air conditioner, etc.

[0091] The above description and drawings sufficiently illustrate the embodiments of the present disclosure to enable one of ordinary skill in the art to practice them. Other embodiments can include structural and other changes. The embodiments represent the possible changes and modifications of the possible variations. Individual components and functions are optional unless explicitly required, and the order of operations can be changed. Some parts and features of some embodiments can be included in or replace parts and features of other embodiments. The embodiments of the present disclosure are not limited to the structures described above and shown in the drawings, and can be variously modified and changed without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A heat exchanger, characterized by, The heat exchanger comprises: a heat exchange pipe group comprising a first external pipe, a second external pipe, and n heat exchange branches connected in parallel between the first external pipe and the second external pipe, wherein n≥2; a supercooling one-way conducting device arranged on the first external pipe and configured to conduct in one direction from the first external pipe to the heat exchange pipe group; a supercooling pipe group comprising m supercooling pipes, the supercooling pipe group being arranged in parallel with the supercooling one-way conducting device on the first external pipe, and the supercooling pipe group satisfying the following relationship: wherein M is the total number of pipes of the heat exchanger.

2. The heat exchanger of claim 1, wherein The heat exchange branches comprise a first branch, a second branch, and an n-th branch arranged in sequence from top to bottom with respect to the heat exchanger; wherein the first branch comprises m' heat exchange pipes, and the first branch and the supercooling pipe group satisfy the pipe number relationship: m'=m.

3. The heat exchanger of claim 1, wherein The heat exchange branches comprise a first branch, a second branch, and an n-th branch arranged in sequence from top to bottom with respect to the heat exchanger; wherein the supercooling pipe group and the first branch satisfy the pipe diameter relationship: R1 4. The heat exchanger of claim 3, wherein The outer diameter R1 of the supercooling pipes of the supercooling pipe group ranges from 3mm to 5mm. And / or, the outer diameter R2 of the heat exchange pipes of the first branch ranges from 7mm.

5. The heat exchanger of claim 1, wherein The number m of the supercooling pipes ranges from 4 to 10.

6. The heat exchanger of claim 1, wherein The type of the supercooling one-way conducting device comprises a one-way valve or a control valve.

7. The heat exchanger of claim 1, wherein The n heat exchange branches comprise a first branch, a second branch, and a third branch arranged in sequence; The heat exchange pipe group further comprises: a first one-way conducting device having one end connected to a pipe end of the first branch corresponding to the second external pipe and the other end connected to a pipe end of the second branch corresponding to the second external pipe, and being configured to conduct in one direction from the pipe end of the second branch to the pipe end of the first branch; a second one-way conducting device having one end connected to a pipe end of the second branch corresponding to the first external pipe and the other end connected to a pipe end of the third branch corresponding to the first external pipe, and being configured to conduct in one direction from the pipe end of the third branch to the pipe end of the second branch.

8. The heat exchanger according to claim 7, wherein the first branch comprises one or more first heat exchange sub-branches, wherein the plurality of first heat exchange sub-branches are arranged in parallel with each other; and / or the second branch comprises one or more second heat exchange sub-branches, wherein the plurality of second heat exchange sub-branches are arranged in parallel with each other; and / or the third branch comprises one or more third heat exchange sub-branches, wherein the plurality of third heat exchange sub-branches are arranged in parallel with each other.

9. A refrigeration appliance characterized in that, The device comprises a device body and the heat exchanger according to any one of claims 1 to 8.

10. The refrigeration appliance of claim 9, wherein, The type of the refrigeration device is an air conditioner, and the heat exchanger is an outdoor heat exchanger of the air conditioner.

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