A segmented defrosting finned heat exchanger and a heat pump system

Abstract

This utility model discloses a segmented defrosting finned heat exchanger and a heat pump system. The segmented defrosting finned heat exchanger includes: a fin assembly; at least one upper coil assembly and at least one lower coil assembly; a gas collecting pipe assembly, including a main gas collecting pipe, at least one upper gas collecting branch pipe, and at least one lower gas collecting branch pipe, the main gas collecting pipe including an upper gas collecting section and a lower gas collecting section connected to each other; a capillary tube assembly, including at least one upper liquid distributing capillary tube and at least one lower liquid distributing capillary tube; and a control component, including an upper temperature sensor, a lower temperature sensor, and a solenoid valve. The segmented defrosting finned heat exchanger of this utility model can achieve segmented defrosting, thereby improving the overall defrosting efficiency of the segmented defrosting finned heat exchanger. A heat pump system, including the above-mentioned segmented defrosting finned heat exchanger, reduces malfunctions caused by defrosting operations performed on the upper coil assembly in a frost-free state.

Description

Technical Field

[0001] This utility model belongs to the technical field of finned heat exchangers, specifically relating to a segmented defrosting finned heat exchanger and a heat pump system. Background Technology

[0002] A finned heat exchanger is a heat exchange device used for heat exchange between gas and liquid. It improves heat transfer efficiency by adding fins to the surface of the base tube.

[0003] Finned heat exchangers in related technologies have the following problems: (1) Slow defrosting process: In the related technology, when the finned heat exchanger is defrosted, the frost layer on the top of the finned heat exchanger is removed first, while the bottom of the finned heat exchanger is not completely removed due to the thicker frost layer. The air conditioning system will continue to maintain the defrosting mode. In the subsequent defrosting process, the refrigerant will still be distributed to the top of the finned heat exchanger that has been defrosted, while the refrigerant distributed to the bottom of the finned heat exchanger will not increase, maintaining a slow defrosting rate, which results in a long defrosting time for the entire finned heat exchanger.

[0004] (2) Incomplete defrosting: When the frost layer on the bottom of the finned heat exchanger is thick or ice forms, it is often difficult to achieve complete defrosting within the set defrosting time because the heat obtained at the bottom of the finned heat exchanger is insufficient.

[0005] (3) Affecting normal system operation: During the defrosting process, since the frost layer on the top of the finned heat exchanger has already been removed, the top of the finned heat exchanger will continue to be defrosted in a frost-free state until the frost layer at the bottom of the finned heat exchanger is removed. The heat of the refrigerant cannot be fully absorbed, which may lead to excessively high condensing pressure and exhaust temperature, thereby affecting the normal operation of the air conditioning system. Utility Model Content

[0006] In order to overcome the shortcomings of the prior art, one of the objectives of this utility model is to provide a segmented defrosting finned heat exchanger, which can realize segmented defrosting, thereby improving the overall defrosting efficiency of the segmented defrosting finned heat exchanger.

[0007] The second objective of this utility model is to provide a heat pump system. The heat pump system of this utility model adopts the above-mentioned segmented defrosting finned heat exchanger, which can reduce the failures caused by the defrosting operation of the upper coil group in a frost-free state.

[0008] One of the objectives of this utility model is achieved through the following technical solution: A segmented defrosting finned heat exchanger includes: Fin assembly; At least one upper coil assembly and at least one lower coil assembly, with the upper coil assembly located above the fin assembly and the lower coil assembly located below the fin assembly; A gas collecting pipe assembly includes a main gas collecting pipe, at least one upper gas collecting branch pipe and at least one lower gas collecting branch pipe. The main gas collecting pipe includes an upper gas collecting section and a lower gas collecting section that are interconnected. A capillary assembly, comprising at least one upper separating capillary and at least one lower separating capillary; The control component includes an upper temperature sensor, a lower temperature sensor, and a solenoid valve. The upper temperature sensor is installed on the upper separating capillary, and the lower temperature sensor is installed on the lower separating capillary. The upper gas collecting section is connected to the upper liquid separating capillary via the upper gas collecting branch pipe and the upper coil assembly. The lower gas collecting section is connected to the lower liquid separating capillary via the lower gas collecting branch pipe and the lower coil assembly. The solenoid valve is installed on the main gas collecting pipe and between the upper and lower gas collecting sections.

[0009] As a feasible implementation method, the upper gas collecting branch pipe is set up in a one-to-one correspondence with the upper coil group, and the lower gas collecting branch pipe is set up in a one-to-one correspondence with the lower coil group. Furthermore, the gas collecting pipe group includes a upper gas collecting branch pipes and b lower gas collecting branch pipes, where a ≥ b, and both a and b are positive integers.

[0010] As a feasible implementation method, the upper gas collecting branch pipe, the upper coil assembly and the upper liquid separating capillary are set up one by one, and the upper gas collecting branch pipe, the upper coil assembly and the upper liquid separating capillary form the upper defrosting area. The upper temperature sensor is set on the upper liquid separating capillary at the bottom of the upper defrosting area. The lower gas collecting branch pipe, the lower coil assembly, and the lower liquid distributing capillary are set up one by one. The lower gas collecting branch pipe, the lower coil assembly, and the lower liquid distributing capillary form the lower defrosting area. The lower temperature sensor is installed on the lower liquid distributing capillary at the bottom of the lower defrosting area.

[0011] As one possible implementation, the segmented defrosting finned heat exchanger includes at least two upper coil groups, which are arranged sequentially along the longitudinal direction. A segmented defrosting finned heat exchanger includes at least two lower coil groups, which are arranged sequentially along the longitudinal direction.

[0012] As one possible implementation, the upper coil assembly includes at least one upper bend pipe, and multiple upper bend pipes are arranged in m rows along the longitudinal direction and in n columns along the transverse direction, where m≥1, n≥1, and m and n are both positive integers.

[0013] As a feasible implementation method, when m=3 and n=3, one of the upper bends in the first row and one of the upper bends in the third row are inclined, the upper bends in the second row are vertical, and there is a height difference h1 between two adjacent upper bends in the second row, where h1 ranges from 5mm to 30mm.

[0014] As one possible implementation, the lower coil assembly includes at least one lower bend, and multiple lower bends are arranged in m rows along the longitudinal direction and in n columns along the transverse direction; Where m≥1, n≥1, and m and n are both positive integers.

[0015] As a feasible implementation method, when m=3 and n=3, one of the lower bends in the first row and one of the lower bends in the third row are inclined, the lower bends in the second row are vertical, and there is a height difference h2 between two adjacent lower bends in the second row, where h2 ranges from 5mm to 30mm.

[0016] The second objective of this utility model is achieved by the following technical solution: A heat pump system comprising the aforementioned segmented defrosting finned heat exchanger.

[0017] As an optional implementation, the heat pump system also includes a compressor and a plate heat exchanger, with the main gas collection pipe connected to the compressor via a first connecting pipe; The capillary assembly also includes a capillary manifold, which is connected to a plate heat exchanger via a second connecting pipe, and the plate heat exchanger is connected to a compressor via a third connecting pipe.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. The segmented defrosting finned heat exchanger of this utility model uses an upper temperature sensor to detect the temperature of the upper liquid distribution capillary and a lower temperature sensor to detect the temperature of the lower liquid distribution capillary. Based on the temperatures detected by the upper and lower temperature sensors, the solenoid valve opens or closes. When the solenoid valve is closed, the upper coil group no longer defrosts, which reduces the defrosting operation of the upper coil group in the frost-free state. Only the lower coil group is defrosted, so the segmented defrosting finned heat exchanger can achieve segmented defrosting, thereby improving the overall defrosting efficiency of the segmented defrosting finned heat exchanger.

[0019] 2. The heat pump system of this utility model adopts the above-mentioned segmented defrosting finned heat exchanger, which can reduce the defrosting operation of the upper coil group in the frost-free state, thereby reducing the failure of the heat pump system caused by the defrosting operation of the upper coil group in the frost-free state. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the segmented defrosting finned heat exchanger of Embodiment 1 of this utility model.

[0022] Figure 2 This is Embodiment 1 of the present utility model. Figure 1 A partial structural diagram.

[0023] Figure 3 This is Embodiment 1 of the present utility model. Figure 1 A structural schematic diagram of the upper bend in the middle from another perspective.

[0024] Figure 4 This is Embodiment 1 of the present utility model. Figure 1 Another partial structural diagram.

[0025] Figure 5 This is Embodiment 1 of the present utility model. Figure 1 A structural schematic diagram of the lower bend in the pipe from another perspective.

[0026] Figure 6 This is a schematic diagram of the heat pump system in defrost mode according to Embodiment 2 of this utility model.

[0027] Explanation of key figure labels: 10. Fin assembly; 20. Upper coil assembly; 201. Upper bend; 30. Lower coil assembly; 301. Lower bend; 40. Gas collecting pipe assembly; 401. Gas collecting main pipe; 4011. Upper gas collecting section; 4012. Lower gas collecting section; 402. Upper gas collecting branch pipe; 403. Lower gas collecting branch pipe; 50. Capillary assembly; 501. Upper liquid separating capillary; 502. Lower liquid separating capillary; 503. Capillary main pipe; 60. Control components; 601. Upper temperature sensor; 602. Lower temperature sensor; 603. Solenoid valve; 70. Compressor; 80. Plate heat exchanger; 90. First connecting pipe; 100. Second connecting pipe; 110. Third connecting pipe; 120. Four-way valve. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0030] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0031] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0032] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0033] The technical solution of this utility model will be further described below with reference to the embodiments and accompanying drawings.

[0034] Example 1 See Figures 1 to 5This utility model discloses a segmented defrosting finned heat exchanger, comprising: a fin assembly 10; at least one upper coil assembly 20 and at least one lower coil assembly 30, wherein the upper coil assembly 20 is disposed on the upper part of the fin assembly 10 and the lower coil assembly 30 is disposed on the lower part of the fin assembly 10; a gas collecting pipe assembly 40, comprising a main gas collecting pipe 401, at least one upper gas collecting branch pipe 402 and at least one lower gas collecting branch pipe 403, wherein the main gas collecting pipe 401 comprises an upper gas collecting section 4011 and a lower gas collecting section 4012 that are interconnected; and a capillary assembly 50, comprising at least one upper liquid separating capillary 501 and at least one lower liquid separating capillary 502. 02; Control component 60, which includes an upper temperature sensor 601, a lower temperature sensor 602, and a solenoid valve 603. The upper temperature sensor 601 is installed on the upper liquid distribution capillary tube 501, and the lower temperature sensor 602 is installed on the lower liquid distribution capillary tube 502. The upper gas collecting section 4011 is connected to the upper liquid distribution capillary tube 501 through the upper gas collecting branch pipe 402 and the upper coil assembly 20. The lower gas collecting section 4012 is connected to the lower liquid distribution capillary tube 502 through the lower gas collecting branch pipe 403 and the lower coil assembly 30. The solenoid valve 603 is installed on the gas collecting main pipe 401 and is located between the upper gas collecting section 4011 and the lower gas collecting section 4012.

[0035] This utility model discloses a segmented defrosting finned heat exchanger. An upper temperature sensor 601 detects the temperature of the upper liquid distribution capillary 501, and a lower temperature sensor 602 detects the temperature of the lower liquid distribution capillary 502. Based on the temperatures detected by the upper and lower temperature sensors 601 and 602, a solenoid valve 603 opens or closes. When the solenoid valve 603 is closed, the upper coil assembly 20 no longer defrosts, reducing the defrosting operation required in the frost-free state. Only the lower coil assembly 30 defrosts, thus enabling segmented defrosting and improving the overall defrosting efficiency of the segmented defrosting finned heat exchanger.

[0036] It should be noted that the solenoid valve 603 can be a common instantaneous response solenoid valve or a time-delay solenoid valve.

[0037] The temperature data detected by the upper temperature sensor 601 and the lower temperature sensor 602 can be read manually, and the opening and closing of the solenoid valve 603 can be controlled manually. Of course, the control component 60 may also include a control circuit board, which transmits the detected temperature data from the upper temperature sensor 601 and the lower temperature sensor 602 to the control circuit board, and the control circuit board then controls the opening and closing of the solenoid valve 603.

[0038] It should be noted that the specific number of upper gas collecting branch pipes 402 and lower gas collecting branch pipes 403 included in the gas collecting pipe group 40 depends on the actual application scenario. The number of upper gas collecting branch pipes 402 can be more than, equal to or less than the number of lower gas collecting branch pipes 403. The following provides a detailed explanation of the relative sizes of the number of upper gas collecting branch pipes 402 and lower gas collecting branch pipes 403.

[0039] In this embodiment of the utility model, the upper gas collecting branch pipe 402 is arranged in a one-to-one correspondence with the upper coil group 20, and the lower gas collecting branch pipe 403 is arranged in a one-to-one correspondence with the lower coil group 30; and the gas collecting pipe group 40 includes a upper gas collecting branch pipe 402 and b lower gas collecting branch pipes 403, where a ≥ b, and a and b are both positive integers.

[0040] For example, see Figure 1 a=5, b=4, the gas collecting pipe group 40 includes 5 upper gas collecting branch pipes 402 and 4 lower gas collecting branch pipes 403. That is to say, the segmented defrosting finned heat exchanger includes 5 upper coil groups 20 and 4 lower coil groups 30.

[0041] When solenoid valve 603 is open, the fluid flow rate in both the upper gas collecting branch pipe 402 and the lower gas collecting branch pipe 403 is Q, so the fluid flow rate in the main gas collecting pipe 401 is 5Q + 4Q = 9Q. When solenoid valve 603 is closed, the fluid flow rate in the upper gas collecting branch pipe 402 is 0, and the fluid flow rate in the lower gas collecting branch pipe 403 is 9Q / 4, so the fluid flow rate increment δ1 in the lower gas collecting branch pipe 403 is 5 / 4Q. It can be seen that when solenoid valve 603 is closed, the fluid flow rate in the lower gas collecting branch pipe 403 increases, so that the heat received by the lower coil assembly 30 increases, thereby achieving relatively rapid and complete defrosting.

[0042] When a=b, for example, a=5 and b=5, the gas collecting pipe group 40 includes 5 upper gas collecting branch pipes 402 and 5 lower gas collecting branch pipes 403. That is, the segmented defrosting finned heat exchanger includes 5 upper coil groups 20 and 5 lower coil groups 30. When the solenoid valve 603 is open, the fluid flow rate in the upper gas collecting branch pipe 402 and the fluid flow rate in the lower gas collecting branch pipe 403 are both Q. Then the fluid flow rate in the main gas collecting pipe 401 is 5Q+5Q=10Q. When the solenoid valve 603 is closed, the fluid flow rate in the upper gas collecting branch pipe 402 is 0, and the fluid flow rate in the lower gas collecting branch pipe 403 is 10Q / 5=2Q. Therefore, the fluid flow rate increment δ2 in the lower gas collecting branch pipe 403 is Q.

[0043] When a < b, for example, a = 4 and b = 5, the gas collecting pipe group 40 includes 4 upper gas collecting branch pipes 402 and 5 lower gas collecting branch pipes 403. That is, the segmented defrosting finned heat exchanger includes 4 upper coil groups 20 and 5 lower coil groups 30. When the solenoid valve 603 is open, the fluid flow rate in the upper gas collecting branch pipe 402 and the fluid flow rate in the lower gas collecting branch pipe 403 are both Q. Then the fluid flow rate in the main gas collecting pipe 401 is 4Q + 5Q = 9Q. When the solenoid valve 603 is closed, the fluid flow rate in the upper gas collecting branch pipe 402 is 0, and the fluid flow rate in the lower gas collecting branch pipe 403 is 9Q / 5. Therefore, the fluid flow rate increment δ3 in the lower gas collecting branch pipe 403 is 4 / 5Q.

[0044] Since 5Q / 4 > Q > 4Q / 5, it can be seen that, considering only the fluid flow rate increment, a ≥ b and when solenoid valve 603 is closed, the defrosting effect of this segmented defrosting finned heat exchanger is better.

[0045] It should be noted that in other embodiments, a=4, b=4, or a=4, b=2, or a=6, b=2, ..., the specific values ​​of a and b are determined according to the actual situation and are not limited.

[0046] In this embodiment of the invention, the upper gas collecting branch pipe 402, the upper coil assembly 20, and the upper liquid distributing capillary 501 are arranged in a one-to-one correspondence, forming an upper defrosting area. An upper temperature sensor 601 is provided on the upper liquid distributing capillary 501 at the bottom of the upper defrosting area. The lower gas collecting branch pipe 403, the lower coil assembly 30, and the lower liquid distributing capillary 502 are arranged in a one-to-one correspondence, forming a lower defrosting area. A lower temperature sensor 602 is provided on the lower liquid distributing capillary 502 at the bottom of the lower defrosting area.

[0047] Since the temperature of the finned heat exchanger gradually decreases from top to bottom, when an upper temperature sensor 601 is installed on the upper liquid distribution capillary 501 at the bottom of the upper defrost zone, the temperature T1 detected by the upper temperature sensor 601 is the lowest temperature of the upper defrost zone; when a lower temperature sensor 602 is installed on the lower liquid distribution capillary 502 at the bottom of the lower defrost zone, the temperature T2 detected by the lower temperature sensor 602 is the lowest temperature of the lower defrost zone.

[0048] The comparison temperature is set to T, which is based on the critical temperature for frost melting. When the upper temperature sensor 601 or the lower temperature sensor 602 detects a temperature higher than T, it indicates that the frost in the corresponding area has completely melted (frost-free state). When the upper temperature sensor 601 or the lower temperature sensor 602 detects a temperature lower than T, it indicates that there is still frost remaining. This segmented defrosting finned heat exchanger is used in heat pump systems.

[0049] When T1 < T and T2 < T, it indicates that both the upper and lower defrost areas are in a frosty state, and the segmented defrost finned heat exchanger enters the full-section defrost stage of the defrost mode. When the solenoid valve 603 is opened, the heat pump system sends high-temperature and high-pressure gaseous refrigerant through the main gas collecting pipe 401 and the upper gas collecting branch pipe 402 into the upper coil group 20, where it exchanges heat with the upper coil group 20 to defrost it. The high-temperature and high-pressure gaseous refrigerant is converted into low-temperature and low-pressure liquid refrigerant and enters the upper liquid distributing capillary tube 501. The high-temperature and high-pressure gaseous refrigerant enters the lower coil group 30 through the main gas collecting pipe 401 and the lower gas collecting branch pipe 403, where it exchanges heat with the lower coil group 30 to defrost it. The high-temperature and high-pressure gaseous refrigerant is converted into low-temperature and low-pressure liquid refrigerant and then enters the lower liquid distributing capillary tube 502.

[0050] When T1 > T and T2 < T, it indicates that the upper defrosting area has completed defrosting, but the lower defrosting area has not yet completed defrosting. At this time, the solenoid valve 603 closes, so the upper defrosting area stops defrosting, and the lower defrosting area continues to defrost. The segmented defrosting finned heat exchanger enters the segmented defrosting stage of the defrosting mode. At this time, the high-temperature and high-pressure gaseous refrigerant continues to enter the lower coil group 30 through the gas collecting main pipe 401 and the lower gas collecting branch pipe 403, and exchanges heat with the lower coil group 30 to defrost the lower coil. The high-temperature and high-pressure gaseous refrigerant is transformed into a low-temperature and low-pressure liquid refrigerant and then enters the lower liquid distributing capillary pipe 502.

[0051] When T1 > T and T2 > T, it indicates that both the upper and lower defrost areas are in a frost-free state. The solenoid valve 603 opens, and the segmented defrost finned heat exchanger exits the defrost mode. The heat pump system stops supplying high-temperature and high-pressure gaseous refrigerant to the main gas collection pipe 401. After exiting the defrost mode, the heat pump system can be shut down or switched to the heating mode.

[0052] For example, T=18℃. Of course, the value of T can be determined according to the actual use environment and is not limited.

[0053] It should be noted that the refrigerant can be Freon, carbon dioxide, ammonia, etc.

[0054] In this embodiment of the utility model, the segmented defrosting finned heat exchanger includes at least two upper coil groups 20, which are arranged sequentially along the longitudinal direction; the segmented defrosting finned heat exchanger includes at least two lower coil groups 30, which are arranged sequentially along the longitudinal direction.

[0055] For example, see Figure 1The segmented defrosting finned heat exchanger includes 5 upper coil groups 20, with at least 5 upper coil groups 20 arranged sequentially along the longitudinal direction; the segmented defrosting finned heat exchanger includes 4 lower coil groups 30, with the 4 lower coil groups 30 arranged sequentially along the longitudinal direction.

[0056] It should be noted that the vertical direction is Figure 1 The vertical extension direction of the fin group 10 in the middle.

[0057] In this embodiment of the present invention, the upper coil assembly 20 includes at least one upper bend 201, which is arranged in m rows along the longitudinal direction and in n columns along the transverse direction.

[0058] In this embodiment of the utility model, when m=3 and n=3, one of the upper bends 201 in the first row and one of the upper bends 201 in the third row are both inclined, and the upper bends 201 in the second row are both vertically arranged. Furthermore, there is a height difference h1 between two adjacent upper bends 201 in the second row, and the value of h1 ranges from 5mm to 30mm.

[0059] In this embodiment of the utility model, the lower coil assembly 30 includes at least one lower bend 301, which is arranged in m rows along the longitudinal direction and in n columns along the transverse direction; wherein, m≥1, n≥1, and m and n are both positive integers.

[0060] In this embodiment of the utility model, when m=3 and n=3, one of the lower bends 301 in the first row and one of the lower bends 301 in the third row are both inclined, and the lower bends 301 in the second row are all vertically arranged. Furthermore, there is a height difference h2 between two adjacent lower bends 301 in the second row, and the value of h2 ranges from 5mm to 30mm.

[0061] It should be noted that when the upper coil group 20 includes one upper bend 201, the one upper bend 201 is arranged in a row along the longitudinal direction and in a column along the transverse direction; when the lower coil group 30 includes one lower bend 301, the one lower bend 301 is arranged in a row along the longitudinal direction and in a column along the transverse direction.

[0062] Of course, in order to increase the heat exchange efficiency between the segmented defrosting finned heat exchanger and the airflow passing through it, the upper coil assembly 20 includes two or more upper bends 201, and the lower coil assembly 30 includes two or more lower bends 301.

[0063] The angle between the inclined upper bend 201 and the longitudinal direction is 30°-60°, and the angle between the inclined lower bend 301 and the longitudinal direction is 30°-60°. The arrangement of the upper bends 201 and the lower bends 301 is such that they do not interfere with each other.

[0064] The upper bend 201 is U-shaped or S-shaped, and the upper bends 201 are welded together to form an upper coil assembly 20; the lower bend 301 is U-shaped or S-shaped, and the lower bends 301 are welded together to form a lower coil assembly 30.

[0065] It should be noted that the fin assembly 10 includes multiple fins, which are spaced apart and sleeved on the upper coil assembly 20 and the lower coil assembly 30.

[0066] For example, see Figures 1 to 5 The segmented defrosting finned heat exchanger has a multi-row, multi-column array of upper bend tubes. Some of the upper bend tubes 201 are inclined to reduce their space occupation in the longitudinal direction, thereby increasing the number of upper bend tubes 201. Some of the upper bend tubes 201 are arranged in a staggered manner by setting a height difference, so as to increase the contact area between the upper coil group 20 and the external transverse airflow.

[0067] Similarly, the segmented defrosting finned heat exchanger has a multi-row, multi-column array of lower bends, and some of the lower bends 301 are inclined to reduce their space occupation in the longitudinal direction, thereby increasing the number of lower bends 301. Some of the lower bends 301 are arranged in a staggered manner by setting a height difference, so as to increase the contact area between the lower coil group 30 and the external transverse airflow.

[0068] When the external transverse airflow passes through the fin group 10, the upper coil group 20 and the lower coil group 30, the external transverse airflow can have a more thorough heat exchange with the fin group 10, the upper coil group 20 and the lower coil group 30, thereby improving the heat exchange efficiency of the segmented defrosting finned heat exchanger.

[0069] Example 2 See Figures 1 to 6 In this embodiment of the present invention, a heat pump system is disclosed, including the above-mentioned segmented defrosting finned heat exchanger.

[0070] The heat pump system of this utility model adopts the above-mentioned segmented defrosting finned heat exchanger, which can reduce the defrosting operation of the upper coil group 20 in the frost-free state, thereby reducing the failure of the heat pump system caused by the defrosting operation of the upper coil group 20 in the frost-free state.

[0071] In this embodiment of the utility model, the heat pump system further includes a compressor 70 and a plate heat exchanger 80. The main gas collection pipe 401 is connected to the compressor 70 through a first connecting pipe 90. The capillary tube group 50 also includes a capillary main pipe 503, which is connected to the plate heat exchanger 80 through a second connecting pipe 100. The plate heat exchanger 80 is connected to the compressor 70 through a third connecting pipe 110.

[0072] For example, when the heat pump system is in defrost mode and the segmented defrost finned heat exchanger enters the segmented defrost stage of the defrost mode; the high-temperature and high-pressure gaseous refrigerant enters the lower coil group 30 through the main gas collecting pipe 401 and the lower gas collecting branch pipe 403, and exchanges heat with the lower coil group 30 to defrost the lower coil. The high-temperature and high-pressure gaseous refrigerant is converted into a high-temperature and high-pressure liquid refrigerant and then enters the lower liquid distributing capillary pipe 502; the high-temperature and high-pressure liquid refrigerant enters the plate heat exchanger 80 through the capillary pipe 503 and the second connecting pipe 100 to obtain a low-temperature and low-pressure gaseous refrigerant. The low-temperature and low-pressure gaseous refrigerant enters the compressor 70 through the third connecting pipe 110 to obtain a high-temperature and high-pressure gaseous refrigerant. The high-temperature and high-pressure gaseous refrigerant enters the main gas collecting pipe 401 through the first connecting pipe 90, thereby forming a loop.

[0073] Similarly, when the heat pump system is in defrost mode and the segmented defrost finned heat exchanger enters the full-section defrost stage of the defrost mode, the above-mentioned loop is also formed.

[0074] After the solenoid valve 603 is closed, the high-temperature and high-pressure refrigerant remaining in the upper gas collecting section 4011 can continue to flow through the upper gas collecting branch pipe 402, the upper coil group 20, and the upper liquid separating capillary pipe 501 into the capillary main pipe 503, and then enter the plate heat exchanger 80 through the second connecting pipe 100, and finally flow back to the compressor 70.

[0075] When the heat pump system is in heating mode, high-temperature and high-pressure gaseous refrigerant enters the plate heat exchanger 80 from the compressor 70 through the third connecting pipe 110 to obtain high-temperature and high-pressure liquid refrigerant. The high-temperature and high-pressure liquid refrigerant undergoes heat exchange through the second connecting pipe 100, capillary tube group 50, upper coil group 20 and lower coil group 30 to obtain low-temperature and low-pressure gaseous refrigerant. The low-temperature and low-pressure gaseous refrigerant enters the compressor 70 through the gas collecting pipe group 40 and the first connecting pipe 90 to obtain high-temperature and high-pressure gaseous refrigerant.

[0076] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A segmented defrosting finned heat exchanger, characterized in that, include: Fin assembly; At least one upper coil assembly and at least one lower coil assembly, wherein the upper coil assembly is disposed above the fin assembly and the lower coil assembly is disposed below the fin assembly; A gas collecting pipe assembly, comprising a main gas collecting pipe, at least one upper gas collecting branch pipe and at least one lower gas collecting branch pipe, wherein the main gas collecting pipe comprises an upper gas collecting section and a lower gas collecting section that are interconnected. A capillary assembly, comprising at least one upper separating capillary and at least one lower separating capillary; The control component includes an upper temperature sensor, a lower temperature sensor, and a solenoid valve. The upper temperature sensor is installed on the upper separating capillary tube, and the lower temperature sensor is installed on the lower separating capillary tube. The upper gas collecting section is connected to the upper liquid distributing capillary via the upper gas collecting branch pipe and the upper coil assembly. The lower gas collecting section is connected to the lower liquid distributing capillary via the lower gas collecting branch pipe and the lower coil assembly. The solenoid valve is installed on the main gas collecting pipe and is located between the upper gas collecting section and the lower gas collecting section.

2. The segmented defrosting finned heat exchanger according to claim 1, characterized in that: The upper gas collecting branch pipe is configured in a one-to-one correspondence with the upper coil assembly, and the lower gas collecting branch pipe is configured in a one-to-one correspondence with the lower coil assembly. Furthermore, the gas collecting pipe group includes a upper gas collecting branch pipe and b lower gas collecting branch pipes, where a ≥ b, and both a and b are positive integers.

3. The segmented defrosting finned heat exchanger according to claim 1, characterized in that: The upper gas collecting branch pipe, the upper coil assembly, and the upper liquid distributing capillary are arranged in a corresponding manner. The upper gas collecting branch pipe, the upper coil assembly, and the upper liquid distributing capillary form an upper defrosting area. The upper temperature sensor is provided on the upper liquid distributing capillary located at the bottom of the upper defrosting area. The lower gas collecting branch pipe, the lower coil assembly, and the lower liquid distributing capillary are arranged in a corresponding manner. The lower gas collecting branch pipe, the lower coil assembly, and the lower liquid distributing capillary form a lower defrosting area. The lower temperature sensor is installed on the lower liquid distributing capillary located at the bottom of the lower defrosting area.

4. The segmented defrosting finned heat exchanger according to claim 1, characterized in that: The segmented defrosting finned heat exchanger includes at least two upper coil groups, and the at least two upper coil groups are arranged sequentially along the longitudinal direction; The segmented defrosting finned heat exchanger includes at least two lower coil groups, which are arranged sequentially along the longitudinal direction.

5. The segmented defrosting finned heat exchanger according to claim 1, characterized in that: The upper coil assembly includes at least one upper bend pipe, and multiple upper bend pipes are arranged in m rows along the longitudinal direction and in n columns along the transverse direction, where m≥1, n≥1, and m and n are both positive integers.

6. The segmented defrosting finned heat exchanger according to claim 5, characterized in that: When m=3 and n=3, one of the upper bends in the first row and one of the upper bends in the third row are inclined, the upper bends in the second row are vertical, and there is a height difference h1 between two adjacent upper bends in the second row, where h1 ranges from 5mm to 30mm.

7. The segmented defrosting finned heat exchanger according to claim 1, characterized in that: The lower coil assembly includes at least one lower bend, and multiple lower bends are arranged in m rows along the longitudinal direction and in n columns along the transverse direction. Where m≥1, n≥1, and m and n are both positive integers.

8. The segmented defrosting finned heat exchanger according to claim 7, characterized in that: When m=3 and n=3, one of the lower bends in the first row and one of the lower bends in the third row are inclined, the lower bends in the second row are vertical, and there is a height difference h2 between two adjacent lower bends in the second row, where h2 ranges from 5mm to 30mm.

9. A heat pump system, characterized in that, Including the segmented defrosting finned heat exchanger as described in any one of claims 1-8.

10. The heat pump system according to claim 9, characterized in that: The heat pump system also includes a compressor and a plate heat exchanger, and the main gas collection pipe is connected to the compressor through a first connecting pipe; The capillary assembly also includes a capillary manifold, which is connected to the plate heat exchanger via a second connecting pipe, and the plate heat exchanger is connected to the compressor via a third connecting pipe.

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