Finned tube heat exchanger assembly, air conditioner main unit and equipment platform of air conditioner main unit

Abstract

The utility model belongs to the technical field of green energy conservation, and discloses a finned tube heat exchanger assembly, an air conditioner host and an equipment platform of the air conditioner host. The finned tube heat exchanger assembly comprises a plurality of finned tube heat exchangers and a plurality of refrigerant branches; the liquid distributing and collecting lotus head and the gas collecting and distributing pipe are arranged on the same end plate of the same finned tube heat exchanger or the end plates of different finned tube heat exchangers; the adjacent finned tube heat exchangers are communicated with refrigerant branches through refrigerant gap bridge pipelines, and refrigerant liquid pipes, communicated with the liquid distributing and collecting lotus heads, of the adjacent refrigerant branches on the same finned tube heat exchanger are arranged adjacently. And the superheat heat exchange section, the phase change heat exchange section and the supercooling heat exchange section of any refrigerant pipeline between the gas collecting and distributing pipe and the liquid distributing and collecting lotus head are distributed on each flat plate type finned tube heat exchanger. The structure and the process of the finned tube heat exchanger assembly are simplified, and the degree of supercooling of condensate when the finned tube heat exchanger is used as a condenser and the degree of superheat of steam when the finned tube heat exchanger is used as an evaporator are improved.

Description

Technical Field

[0001] This utility model belongs to the field of green energy-saving technology, and in particular relates to finned tube heat exchanger assemblies and air conditioning units and their equipment platforms. Background Technology

[0002] Existing technologies, such as a vertically arranged air conditioning unit and its equipment platform (application number 202310972409.9) and a sawtooth-shaped finned tube heat exchanger assembly and its air conditioning unit and equipment platform (application number 202311012468.8), propose the concepts of airflow coupling and energy coupling between the air conditioning unit and the external facade decorative structure of the equipment platform. They employ explicit external heat exchanger inlet and outlet duct technology integrated into the air conditioning unit, and a tiered planing low-speed air distribution technology using a fin planer on the finned tube external heat exchanger fins. This fundamentally restructures the internal structure of the air conditioning unit and the structural relationship between the air conditioning unit and the equipment platform's facade, exhibiting significant substantive features and substantial progress. Furthermore, it creates conditions for integrating the air conditioning unit's airflow structure into the equipment platform's louvers. However, in practical application, the above-mentioned existing technologies face some important process and technical problems, mainly:

[0003] (i) The complex structure of refrigerant distribution and collection increases the risk of refrigerant leakage.

[0004] The M-shaped finned tube heat exchanger assembly in the aforementioned patented technology consists of two V-shaped finned tube modules. If it is connected to the compressor nearby, it requires three liquid distribution lotus heads and three gas distribution pipes to implement secondary distribution of refrigerant and secondary collection after heat exchange phase change. When designing the whole system, it is also necessary to go back and solve the problem of primary distribution and primary collection of refrigerant between these three liquid distribution lotus heads and three gas distribution pipes.

[0005] The secondary distribution and recycling of refrigerant in the aforementioned large refrigeration system results in complex pipeline structures and manufacturing processes for refrigerant distribution and recycling, and increases the risk of refrigerant leakage.

[0006] (ii) Insufficient cooling of the outlet condensate when used as a condenser; insufficient superheating of the outlet steam when used as an evaporator.

[0007] Finned tube heat exchangers for air conditioning are typically made by expanding copper tubes with aluminum alloy fins, thus becoming a good conductor of heat and a metal structure with a tendency to achieve temperature equilibrium.

[0008] When a finned tube heat exchanger operates as a condenser, the heat from the high-temperature, high-pressure refrigerant gas inside the tubes at the beginning of each branch is released to the air through the copper tubes and the outer fins, and is also transferred to the condensate in the end pipes of each branch through the thermal bridge of the fins. In particular, the end pipe (subcooled section) of each branch passively receives the heat conducted by the inlet pipe of the next branch's high-temperature refrigerant gas through the fins, making it difficult to achieve a deep "subcooling operation" of the condensate. Insufficient "subcooling" of the condensate at the condenser outlet increases the "dryness" of the refrigerant at the outlet of the expansion valve, reducing the heat absorbed by the condensate as it enters the evaporator.

[0009] Similarly, when finned tubes are used as evaporators, the thermal bridging effect of the fins reduces the "superheat" of the steam at the evaporator outlet, thereby reducing the heat absorbed by the evaporator and the heat released by the condenser.

[0010] The fundamental changes in the application scenarios of air conditioning units now call for disruptive innovations in the structure of the air conditioning unit itself and the spatial relationship between the air conditioning unit and the equipment platform:

[0011] First, driven by the policy that "the area of ​​the equipment platform is not included in the building floor area," the independent equipment platform with good accessibility for the "multi-split" air conditioning unit has been effectively implemented. The potential of multi-split air conditioning to reduce noise radiation range and create a simple and elegant indoor and outdoor decoration has been fully explored, thus replacing single-split room air conditioners (split air conditioners) and becoming the mainstream product in the air conditioning market.

[0012] Secondly, traditional multi-split air conditioning units with side-discharge axial flow fans enter the equipment platform from the exterior wall of the building. The air inlet and outlet paths of the external heat exchanger face unprecedentedly stringent spatial constraints of the equipment platform, which has a floor below, a ceiling above, a wall behind, and louvers in front. The side-discharge air conditioning unit faces the louvers, resulting in increased exhaust static pressure, reduced air volume, and some short-circuit backflow in the reduced air volume, leading to serious degradation of air conditioning performance and other problems that urgently need to be solved. Summary of the Invention

[0013] To address the aforementioned technical problems, this utility model provides a finned tube heat exchanger assembly.

[0014] Another objective of this utility model is to provide an air conditioning unit;

[0015] Another objective of this invention is to provide an equipment platform.

[0016] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0017] A finned tube heat exchanger assembly includes a finned tube heat exchanger, a liquid manifold connector, and a gas manifold.

[0018] The finned tube heat exchanger includes, but is not limited to, single-row, double-row, triple-row, quadruple-row, and five-row finned tube heat exchangers; the finned tube heat exchanger includes several refrigerant branches; the liquid interface of each refrigerant branch is connected to the liquid distribution lotus head, and the gas interface of the refrigerant branch is connected to the gas distribution pipe; the liquid distribution lotus head and the gas distribution pipe are located on the same side end plate of the finned tube heat exchanger; the refrigerant liquid pipes of two refrigerant branches connected to the liquid distribution lotus head are arranged adjacent to each other on the same set of fins of the same row of finned tube heat exchangers.

[0019] Furthermore, two adjacent refrigerant branches form a refrigerant piping module unit, and the two refrigerant liquid pipes in the refrigerant piping module unit are arranged adjacent to each other on the same set of fins on the same row of finned tube heat exchangers; or, the two refrigerant liquid pipes of the two adjacent refrigerant piping module units are arranged adjacent to each other on the same set of fins on the same row of finned tube heat exchangers.

[0020] Furthermore, the refrigerant gas pipes connected to the fluorine gas interfaces of two adjacent refrigerant piping module units are arranged adjacently on the same set of fins on the same row of finned tube heat exchangers; or, the two refrigerant gas pipes of the refrigerant piping module units are arranged adjacently on the same set of fins on the same row of finned tube heat exchangers.

[0021] A finned tube heat exchanger assembly includes several flat-plate finned tube heat exchangers, a liquid manifold connector, and a gas manifold. The flat-plate finned tube heat exchangers include, but are not limited to, single-row, double-row, triple-row, quadruple-row, and five-row finned tube heat exchangers. Each flat-plate finned tube heat exchanger includes several refrigerant branches. The refrigerant branches between different flat-plate finned tube heat exchangers are connected in series via refrigerant bridge pipes. The refrigerant branches connect the liquid manifold connector and the gas manifold to form the finned tube heat exchanger assembly.

[0022] Furthermore, the liquid distribution lotus head and the gas distribution pipe are located on the same side end plate of the same flat plate finned tube heat exchanger; or they are located on the end plates of different flat plate finned tube heat exchangers.

[0023] Furthermore, adjacent flat-plate finned tube heat exchangers are connected by refrigerant bridge pipes, and the superheating heat exchange section, phase change heat exchange section, and subcooling heat exchange section of any refrigerant branch from the gas distribution pipe to the liquid distribution lotus head are distributed and arranged in each flat-plate finned tube heat exchanger; or, any refrigerant branch from the gas distribution pipe to the liquid distribution lotus head is segmented and arranged in each flat-plate finned tube heat exchanger.

[0024] Furthermore, the refrigerant liquid pipes of the two refrigerant branches connecting the manifolds are arranged adjacent to each other on the same set of finned plates of the same row of finned tube heat exchangers.

[0025] Furthermore, the refrigerant pipes of the two refrigerant branches are arranged far apart on the same set of finned plates of the same row of finned tube heat exchangers.

[0026] Furthermore, the total length of the refrigerant piping in any refrigerant branch from the liquid manifold to the gas manifold is equal or substantially equal.

[0027] An air conditioning unit includes the finned tube heat exchanger assembly.

[0028] Furthermore, the air conditioning unit includes a housing, a negative pressure chamber, an exhaust chamber, a compressor chamber, and a fan; the negative pressure chamber and the exhaust chamber are arranged side by side; the compressor chamber is located outside the first back plate of the negative pressure chamber and / or the exhaust chamber; the air intake direction of the fan is orthogonal or nearly orthogonal to the main air outlet direction of the finned tube heat exchanger assembly, thereby constructing an airflow vortex chamber between the air outlet of the finned tube heat exchanger assembly and the air intake of the fan in the negative pressure chamber.

[0029] Furthermore, the air conditioning unit includes a housing, a negative pressure chamber, an exhaust chamber, a compressor chamber, and a fan; the compressor chamber and the exhaust chamber are arranged side by side on the outside of the same side plate of the negative pressure chamber; the air intake direction of the fan is orthogonal or nearly orthogonal to the main air outlet direction of the finned tube heat exchanger assembly, thereby constructing an airflow vortex chamber between the air outlet of the finned tube heat exchanger assembly and the air intake of the fan in the negative pressure chamber.

[0030] Furthermore, the air conditioning unit is assembled from modules, each module including a compressor cavity with a compressor, an external heat exchanger assembly cavity with a finned tube heat exchanger assembly, a vertical exhaust cavity, and a longitudinal exhaust cavity connected to the vertical exhaust cavity; the longitudinal exhaust cavity is located below or above the external heat exchanger assembly cavity and is fixedly connected to the bottom plate or top plate of the vertical exhaust cavity; the compressor cavity is located on the side of the longitudinal exhaust cavity of the external heat exchanger assembly cavity and is connected to the external heat exchanger assembly cavity for refrigerant and electrical circuits; the exhaust port of the longitudinal exhaust cavity faces the same direction as the air inlet of the finned tube heat exchanger assembly.

[0031] Furthermore, the horizontal cross-sectional dimension of the longitudinal exhaust cavity is greater than or equal to the horizontal cross-sectional dimension of the external heat exchanger assembly cavity; the back plate of the external heat exchanger assembly cavity is flush with the back plate of the longitudinal exhaust cavity; and the compressor cavity is located on the back plate of the longitudinal exhaust cavity of the external heat exchanger assembly cavity.

[0032] An equipment platform, wherein the air conditioning unit is mounted on the equipment platform.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] 1. Saves on refrigerant distribution and collection structural materials

[0035] This utility model provides a finned tube heat exchanger assembly using a set of liquid distribution lotus head and gas distribution pipe, implementing a "one-to-two" connection between two flat plate finned tube heat exchangers in a copper tube V-shaped finned tube heat exchanger assembly. It solves the problems of transporting refrigerant liquid and collecting low-pressure refrigerant vapor in the various refrigerant branches of the two flat plate finned tube heat exchangers in the copper tube V-shaped finned tube heat exchanger assembly as an evaporator, and the problems of distributing high-temperature and high-pressure refrigerant gas and collecting condensate in the various refrigerant branches of the copper tube V-shaped finned tube heat exchanger assembly as a condenser. It also saves materials for the refrigerant distribution and collection structure lotus head and gas distribution pipe.

[0036] 2. Improved the energy efficiency ratio of the refrigeration and air conditioning system.

[0037] This invention improves the heat release temperature difference and heat release of the superheated section of the condenser, increases the subcooling degree of the condensate in the subcooled section and the heat absorption of the evaporator, and can also improve the superheat of the evaporator outlet of the refrigeration system, improve operational safety and energy efficiency ratio.

[0038] This invention simplifies the structure of the external heat exchanger of the air conditioning unit through the above-mentioned disruptive innovations on the air duct side and the refrigerant duct side, improves the uniformity of the operation of distributing refrigerant liquid (as an evaporator) and distributing refrigerant gas (as a condenser), and improves the subcooling of the condensate when used as a condenser and the superheat of the vapor when used as an evaporator, thereby improving the energy efficiency ratio of the refrigeration and air conditioning system and realizing the compact design of the air conditioning unit structure and high-efficiency operation under heavy load.

[0039] This invention simply swaps the inlet and outlet of about half of the refrigerant branches on the finned tube heat exchanger, thereby increasing the fin length between the high-temperature inlet pipe (i.e., refrigerant gas pipe) and the lowest-temperature outlet pipe (i.e., refrigerant liquid pipe) on each refrigerant branch, reducing the temperature gradient on the fin assembly, decreasing the heat conduction intensity along the fin direction, and further deepening the "subcooling depth" of the condensate at the condenser outlet, thus further improving the evaporator's cooling capacity.

[0040] In this invention, the high-temperature inlet pipe and the low-temperature outlet pipe of the two refrigerant branches in each refrigerant pipeline module unit are set back-to-back on different single-row finned tube heat exchangers. This weakens the heat conduction of the refrigerant along the fins across the copper tubes and strengthens the heat exchange between the refrigerant and the ventilation airflow. The fin thermal bridge between the high-temperature inlet pipe and the lowest-temperature outlet pipe of the two refrigerant branches in each refrigerant pipeline module unit is broken, and the "subcooling depth" of the condensate at the outlet of the refrigerant branch is further increased, thereby further improving the cooling capacity of the system evaporator. Attached Figure Description

[0041] Figure 1The finned tube heat exchanger assembly in a vertically arranged air conditioning unit and its equipment platform (202310972409.9) is an existing technology.

[0042] Figure 2 This is a schematic diagram of the copper tube V-shaped finned tube heat exchanger assembly in Example 1, which uses a refrigerant bridge pipeline to connect to the other side of the flat plate finned tube heat exchanger.

[0043] Figure 3 This is a three-dimensional view of the copper tube V-shaped finned tube heat exchanger assembly in Example 1, which uses a refrigerant bridge pipeline to connect the other side of the flat plate finned tube heat exchanger.

[0044] Figure 4 This is a schematic diagram of the copper tube V-shaped finned tube heat exchanger assembly in Example 2, which uses a refrigerant bridge pipeline to connect to the other side of the flat plate finned tube heat exchanger and has the liquid distribution lotus head gas collection pipe set far apart from it.

[0045] Figure 5 This is a front view of the single-row finned tube heat exchanger of Example 3;

[0046] Figure 6 This is a front view of a refrigerant branch pipeline of the single-row finned tube heat exchanger in Example 3;

[0047] Figure 7 To increase the subcooling at the condenser terminal and reduce the refrigerant vaporization ratio in the throttling valve, thereby increasing the refrigerant's cooling capacity in the evaporator, a pressure-enthalpy diagram of the refrigerant cycle is used for refrigerant circulation analysis.

[0048] Figure 8 for Figure 6 The diagram shows the temperature field of a single-row finned tube heat exchanger where the refrigerant branch is disconnected between the pipes and then unfolded again to form a straight finned tube heat exchanger during ventilation and heat exchange operation.

[0049] Figure 9 A comparison of the ventilation and heat transfer temperature fields of two different finned tube heat exchanger structures: one is a refrigerant branch of an existing single-row finned tube heat exchanger, and the other is a straight finned tube heat exchanger with fins that are disconnected and then unfolded between the refrigerant branch and the adjacent refrigerant branch.

[0050] Figure 10 A three-dimensional view of a copper tube V-shaped finned tube heat exchanger assembly with ultra-high heat exchange efficiency, in Example 3, which has a refrigerant bridge pipeline and separate liquid and gas distribution pipes.

[0051] Figure 11 A three-dimensional view of the refrigerant bridge pipeline of a copper tube V-shaped finned tube heat exchanger assembly with ultra-high heat exchange efficiency, which has a refrigerant bridge pipeline and is equipped with a refrigerant bridge pipeline in Example 3 and has a liquid distribution lotus head and a gas distribution pipeline that are far apart.

[0052] Figure 12 A two-dimensional unfolded view of the copper tube N-shaped finned tube heat exchanger assembly with ultra-high heat exchange efficiency, which is provided with a refrigerant bridge pipeline and a liquid distribution lotus head and a gas distribution pipe set far apart.

[0053] Figure 13 A top view of the operating airflow of a copper tube V-shaped finned tube heat exchanger assembly with ultra-high heat exchange efficiency, which is equipped with a refrigerant bridge pipeline and has a liquid distribution lotus head and a gas distribution pipe set far apart.

[0054] Figure 14 This is a top view of the air conditioning unit of the V-shaped finned tube heat exchanger assembly in Example 4, which uses a refrigerant bridge pipeline and has the liquid distribution lotus head and the gas distribution pipes arranged far apart.

[0055] Figure 15 This is a two-dimensional unfolded view of the N-shaped finned tube heat exchanger assembly with ultra-high heat exchange efficiency, which has a refrigerant overpass pipeline and a liquid distribution lotus head and a gas distribution pipe set far apart from each other in Example 4.

[0056] Figure 16 This is a top view of the air conditioning unit's airflow operation in Example 4, which uses a refrigerant bridge pipeline and a V-shaped finned tube heat exchanger assembly with the liquid manifold and gas manifold positioned far apart.

[0057] Figure 17 This is a schematic diagram of the finned tube heat exchanger structure with the refrigerant branch gas interface connecting pipes arranged "back to back" in Example 5.

[0058] Figure 18 This is a three-dimensional perspective view of the compact air conditioning unit with a finned tube heat exchanger structure arranged "back-to-back" with the refrigerant pipeline connected by the gaseous interface of the refrigerant branch in Example 5.

[0059] Figure 19 This is a top view of the compact air conditioning unit air duct structure of Example 5, which uses a refrigerant branch gas interface to connect the refrigerant pipeline in a "back-to-back" arrangement.

[0060] Figure 20 This is a schematic diagram of refrigerant flow during operation of a finned tube heat exchanger with a back-to-back arrangement of the gaseous interface connecting pipes of the refrigerant branch in Example 5.

[0061] Figure 21 This is a top view of the airflow of the compact air conditioning unit with a refrigerant branch gas interface connected to the refrigerant pipeline in Example 5, arranged "back to back".

[0062] Figure 22 A two-dimensional unfolded view of the M-shaped finned tube heat exchanger assembly with ultra-high heat exchange efficiency, which is provided with a refrigerant bridge pipeline and has a liquid distribution lotus head and a gas distribution pipe arranged far apart in Example 6.

[0063] Figure 23 This is a schematic diagram of the finned tube heat exchanger structure in Example 7, where the gas and liquid refrigerant branch gas interfaces and connecting pipes are arranged "back to back".

[0064] Figure 24 This is a schematic diagram of the air conditioner main unit structure in Example 7;

[0065] Figure 25 A two-dimensional unfolded view of the M-shaped finned tube heat exchanger assembly with ultra-high heat exchange efficiency, which is provided with a refrigerant bridge pipeline and has a liquid distribution lotus head and a gas distribution pipe set far apart, as shown in Example 8.

[0066] Figure 26 This is a schematic diagram of the equipment platform for the three-chamber household-coupled central air conditioning unit used in Example 9;

[0067] Figure 27 This is a top view of the equipment platform operating airflow of the three-chamber household-coupled central air conditioning unit used in Example 9;

[0068] Figure 28 This is a schematic diagram of the combined commercial air conditioning unit system in Example 10;

[0069] Figure 29 This is a top view of the combined commercial air conditioning unit external heat exchanger assembly structure and the overall refrigeration system structure in Example 10.

[0070] Figure 30 This is a three-dimensional sectional view of the combined commercial air conditioning unit of Example 10;

[0071] Figure 31 This is a vertical sectional view of the airflow during operation of the combined commercial air conditioning unit in Example 10.

[0072] Figure 32 This is a top view of the airflow operation of the combined commercial coupled air conditioning unit on the equipment platform of Example 10. Detailed Implementation

[0073] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the described embodiments without creative effort are within the scope of protection of this application.

[0074] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0075] In the description of this utility model, it should be understood that the terms "lateral", "longitudinal", "length", "up", "down", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0076] Definition: The direction perpendicular to the exterior facade of the external corridor equipment platform is defined as longitudinal, and the direction parallel to the exterior facade of the external corridor equipment platform is defined as transverse.

[0077] The liquid distribution lotus head and gas distribution pipe of the finned tube heat exchanger are connected to the various branches of the finned tube heat exchanger. They are the refrigerant distribution and collection mechanism and the main hub for refrigerant to enter and exit the finned tube heat exchanger.

[0078] The manifold connector is located at one end of the finned tube heat exchanger. When the finned tube heat exchanger is used as an evaporator, the manifold connector is responsible for distributing and delivering refrigerant to each refrigerant branch of the finned tube heat exchanger. When the finned tube heat exchanger is used as a condenser, the manifold connector is responsible for collecting condensate from each refrigerant branch of the condenser in the reverse direction.

[0079] The manifold is located at one end of the finned tube heat exchanger. When the finned tube heat exchanger is used as an evaporator, the manifold is responsible for collecting low-pressure refrigerant vapor from each refrigerant branch of the evaporator. When the finned tube heat exchanger is used as a condenser, the manifold is responsible for distributing high-temperature and high-pressure refrigerant gas from the compressor in the reverse direction to each refrigerant branch of the condenser.

[0080] The liquid distributor and the gas distributor are a pair of coupled devices on the refrigeration pipeline. They are always used together and work in tandem. When one outputs refrigerant, the other is responsible for recovery. When one distributes refrigerant, the other is responsible for collection. The heat absorption of refrigerant evaporation and the heat release of refrigerant condensation occur on the various refrigerant branches of the finned tube heat exchanger between the liquid distributor and the gas distributor.

[0081] In most scenarios, each refrigerant branch of the finned tube heat exchanger uses an even number of refrigerant pipes (1 U-shaped pipe is equivalent to 2 refrigerant pipes). The liquid manifold and gas manifold are set adjacent to each other and located on the same end face of the finned tube heat exchanger. This simplifies the assembly and manufacturing process, shortens the connection between the four-way valve and the heat exchanger, and reduces the ineffective pipeline resistance generated by pipelines that do not participate in heat exchange.

[0082] The flat plate finned tube heat exchangers include, but are not limited to, single-row, double-row, triple-row, quadruple-row, and five-row finned tube heat exchangers.

[0083] The term "copper pipe" as used in this application refers to any metal pipeline used to transport refrigerant, and may be one of the following: copper pipe, aluminum pipe, iron pipe, titanium pipe, stainless steel pipe, etc.

[0084] The term "refrigerant gas line" as used in this application refers to the refrigerant pipeline connected to the compressor's suction and discharge ports via a four-way valve in a finned tube heat exchanger (whether it is a condenser or an evaporator). These are all high-pressure (or low-pressure) refrigerant gas pipelines, i.e., refrigerant gas lines.

[0085] The term "refrigerant liquid line" as used in this application refers to the refrigerant line connected (near) the expansion valve in a finned tube heat exchanger (whether it is a condenser or an evaporator), which is either entirely liquid or mainly liquid.

[0086] The term "refrigerant bridge pipeline" as used in this application refers to the "copper pipe" of the refrigerant pipeline connecting different finned tube heat exchangers.

[0087] Example 1

[0088] This embodiment focuses on the refrigerant distribution and collection in the copper tube V-shaped finned tube heat exchanger assembly, and solves the problem of refrigerant distribution and recycling for the two flat finned tubes of the V-shaped finned tube heat exchanger assembly by using only one liquid distribution lotus head and one gas distribution pipe (hereinafter collectively referred to as "lotus head" and "gas distribution pipe").

[0089] like Figures 2-3 As shown, a finned tube heat exchanger assembly includes two flat finned tube heat exchangers 1, one liquid manifold 2, and one gas manifold 3.

[0090] The finned tube heat exchanger 1 can be a single-row, double-row, or triple-row finned tube heat exchanger 1;

[0091] The flat plate finned tube heat exchanger 1 includes several refrigerant branches 11; the refrigerant branches 11 between different flat plate finned tube heat exchangers are connected in series through refrigerant bridge pipes 12.

[0092] Multiple refrigerant branches 11 are connected to the liquid distribution lotus head 2 and the gas distribution pipe 3 to form a finned tube heat exchanger assembly.

[0093] The liquid distribution lotus head 2 and the gas distribution pipe 3 are respectively located on the same side end plate 13 of the same flat plate finned tube heat exchanger 1.

[0094] This embodiment uses a set of liquid distribution lotus head 2 and gas distribution pipe 3, which are arranged adjacent to the end plate 13 on the same side of the flat plate finned tube heat exchanger 1. It directly performs liquid distribution and gas distribution for several refrigerant branches 11 in the adjacent flat plate finned tube heat exchanger 1. It also connects several refrigerant bridge pipes 12 in the adjacent flat plate finned tube heat exchanger to several refrigerant branches 11 in another flat plate finned tube heat exchanger 1. This allows for liquid distribution and gas distribution for the operation of these refrigerant branches 11, simplifies the refrigerant feeding and discharging structure of the finned tube heat exchanger, and improves the balance of liquid and gas distribution operations.

[0095] In this embodiment, the refrigerant bridge pipe 12 can be a copper pipe with open ends that is pre-inserted before the finned tube is expanded, or it can be the straight pipe section after the U-shaped tube is cut and bent after the finned tube is expanded.

[0096] In this embodiment, the number of copper pipes used by each of the refrigerant branches 11 in the adjacent flat plate finned tube heat exchanger 1 (including the refrigerant bridge pipe 12 in the adjacent flat plate finned tube heat exchanger 1) and the refrigerant lotus head 2 and gas distribution pipe 3 can be different.

[0097] In this embodiment, when the copper tube V-shaped finned tube heat exchanger assembly is operated as an evaporator, the liquid distribution lotus head 2 of the connecting throttle valve directly distributes and delivers refrigerant to several refrigerant branches 11 in the adjacent flat plate finned tube heat exchanger 1. Furthermore, it connects to several refrigerant branches 11 in another flat plate finned tube heat exchanger 1 of the copper tube V-shaped finned tube heat exchanger assembly via several refrigerant lines 11 in the adjacent flat plate finned tube heat exchanger 1. This allows for the distribution and delivery of refrigerant to these refrigerant branches 11, thereby meeting the refrigerant requirements of each refrigerant branch 11 in the evaporation and heat absorption operation of the copper tube V-shaped finned tube heat exchanger assembly (evaporator). The manifold 3, which connects to the suction port of compressor 4, directly collects low-pressure refrigerant vapor for several refrigerant branches 11 in the adjacent flat plate finned tube heat exchanger 1. It also connects to several refrigerant branches 11 in another flat plate finned tube heat exchanger 1 of the copper tube V-shaped finned tube heat exchanger assembly via several refrigerant pipes 11 in the adjacent flat plate finned tube heat exchanger 1, so as to collect low-pressure refrigerant vapor for the operation of these several refrigerant branches 11.

[0098] In this embodiment, when the copper tube V-shaped finned tube heat exchanger assembly operates as a condenser, the manifold 3, connected to the exhaust pipe of the compressor 4, directly supplies high-temperature, high-pressure refrigerant gas to several refrigerant branches 11 in the adjacent flat-plate finned tube heat exchanger 1. Furthermore, it connects to several refrigerant branches 11 in another flat-plate finned tube heat exchanger 1 of the adjacent flat-plate finned tube heat exchanger assembly via several refrigerant lines 11 in the adjacent flat-plate finned tube heat exchanger 1, thus supplying high-temperature, high-pressure refrigerant gas to these refrigerant branches 11. The body is designed to meet the refrigerant gas demand for condensation and heat release in each refrigerant branch of the copper tube V-shaped finned tube heat exchanger assembly (condenser); the liquid distribution lotus head 2 connected to the throttle valve directly collects the condensate from several refrigerant branches 11 in the adjacent flat plate finned tube heat exchanger 1, and connects to several refrigerant branches 11 in another flat plate finned tube heat exchanger 1 of the copper tube V-shaped finned tube heat exchanger assembly via several refrigerant pipes in the adjacent flat plate finned tube heat exchanger 1 to collect the condensate from these several refrigerant branches 11.

[0099] This embodiment, due to its innovative design of the "refrigerant bridge pipe 12", has significant technical and commercial value:

[0100] (1) Simplify complexity

[0101] This embodiment simplifies the process by using only one set of liquid distribution lotus head 2 and gas distribution pipe 3 to implement a "one-to-two" connection between the two flat plate finned tube heat exchangers of the copper tube V-shaped finned tube heat exchanger assembly. This simultaneously solves the problems of transporting refrigerant liquid and collecting low-pressure refrigerant vapor in each refrigerant branch 11 of the two flat plate finned tube heat exchangers 1 of the copper tube V-shaped finned tube heat exchanger assembly, which acts as an evaporator, as well as the problems of distributing high-temperature and high-pressure refrigerant gas and collecting condensate in each refrigerant branch 11 of the two flat plate finned tube heat exchangers 1 of the copper tube V-shaped finned tube heat exchanger assembly, which acts as a condenser.

[0102] (2) Reduce risk

[0103] When the finned tube heat exchanger 1 is used as an evaporator, the refrigerant supplied to the evaporator from the outlet of the throttle valve is not a single-phase condensate but a gas-liquid two-phase flow, and the gas-liquid ratio varies depending on the operating conditions. Implementing precise distribution of the liquid refrigerant in the gas-liquid two-phase flow faces great risks and difficulties.

[0104] This embodiment uses only one set of liquid distribution lotus head 2 and gas distribution pipe 3 to serve the two flat finned tube heat exchangers of the copper tube V-shaped finned tube heat exchanger assembly, reducing the material consumption and welding workload of the liquid distribution lotus head 2 and gas distribution pipe 3, and reducing the number of pipeline welding points and possible refrigerant leakage points; in particular, this embodiment overcomes the risk of uneven distribution of liquid phase refrigerant caused by the two-stage refrigerant distribution technology scheme composed of two liquid distribution lotus heads and two gas distribution pipes.

[0105] Example 2

[0106] like Figure 4 As shown, a finned tube heat exchanger assembly includes two flat finned tube heat exchangers 1, one liquid manifold 2, and one gas manifold 3.

[0107] The finned tube heat exchanger 1 can be a single-row, double-row, or triple-row finned tube heat exchanger 1;

[0108] The flat plate finned tube heat exchanger 1 includes several refrigerant branches 11; the refrigerant branches 11 between different flat plate finned tube heat exchangers 1 are connected in series through refrigerant bridge pipes 12.

[0109] The refrigerant branch 11 connects to the liquid distribution lotus head 2 and the gas distribution pipe 3 to form a finned tube heat exchanger assembly.

[0110] The liquid distribution lotus head 2 and the gas distribution pipe 3 are respectively installed at the end plate 13 of different flat plate finned tube heat exchangers 1.

[0111] This embodiment is similar to Embodiment 1, both using a set of liquid distribution lotus head 2 and gas distribution pipe 3 to serve two flat plate finned tube heat exchangers 1 of the copper tube V-shaped finned tube heat exchanger assembly.

[0112] The difference in this embodiment is that a set of liquid distribution lotus head 2 and gas distribution pipe 3 is set far apart at both ends of the copper tube V-shaped finned tube heat exchanger assembly to implement liquid distribution and gas distribution for several refrigerant branches 11 in multiple flat plate finned tube heat exchangers 1. Furthermore, several refrigerant bridge pipes 12 between the flat plate finned tube heat exchangers 1 are used to connect the several refrigerant branches 11 distributed in multiple flat plate finned tube heat exchangers 1, so as to implement liquid distribution and gas distribution for the operation of these several refrigerant branches 11, simplifying the refrigerant supply and discharge structure of the finned tube heat exchanger 1, and improving the balance of liquid and gas distribution operations.

[0113] In this embodiment, several refrigerant branches 11 in multiple flat-plate finned tube heat exchangers 1, which are arranged far apart from each other, such as the liquid distribution lotus head 2 and the gas distribution pipe 3, are kept so that the total length of the copper pipes on each refrigerant branch 11 is equal or substantially equal.

[0114] This embodiment possesses all the advantages of Embodiment 1. Furthermore, because a set of liquid distribution lotus heads 2 and gas distribution pipes 3 are positioned far apart at both ends of the copper tube V-shaped (or N-shaped, or M-shaped) finned tube heat exchanger assembly, it achieves an optimized finned tube heat exchanger piping configuration scheme. This scheme involves setting the liquid pipe interface on the liquid distribution lotus head 2 of each refrigerant branch 11 far apart from the gas pipe interface on the gas distribution pipe 3, arranging the gaseous high-temperature refrigerant copper pipes of each refrigerant branch 11 adjacent to each other, and arranging the liquid low-temperature refrigerant pipes of each refrigerant branch 11 adjacent to each other. While fully leveraging the advantage of the finned tube heat exchanger 1 in increasing the heat exchange area of ​​the refrigerant pipes, this embodiment solves the problem in Embodiment 1 where the high-temperature, high-pressure refrigerant gas conducts heat through the finned thermal bridge to the condensate in the copper tube during the subcooling and heat release stage, hindering the deep subcooling of the condensate and reducing the evaporator's cooling capacity.

[0115] Example 3

[0116] like Figures 5-13 This embodiment implements a disruptive innovation in the structure of the finned tube heat exchanger assembly, constructing a V(N, M) shaped finned tube heat exchanger assembly with ultra-high heat exchange efficiency, which is provided with a refrigerant bridge pipeline 12 and the liquid distribution lotus head 2 and the gas distribution pipeline 3 are arranged far apart.

[0117] This embodiment first analyzes the heat transfer process and characteristics of finned tube heat exchanger 1, as well as the relationship between condensate subcooling and evaporator cooling capacity:

[0118] The structure of finned tube heat exchanger 1 is as follows: Figures 5-6 As shown, the middle branch is selected for in-depth analysis; the finned tube heat exchanger 1, which is made of copper tubes expanded with aluminum alloy fins, is essentially a good conductor of heat and a metal structure with temperature uniformity.

[0119] As a heat exchanger between refrigerant and air, the finned tube structure, consisting of copper tubes expanded with aluminum fins, has a dual function:

[0120] ① Enhance heat exchange function

[0121] Due to the low density and small specific heat capacity of air, in the three-stage heat transfer path perpendicular to the copper tube, from the refrigerant (mainly in a two-phase flow pattern) inside the copper tube to the aluminum fins on the copper tube wall and then to the air flow, the thermal resistance mainly occurs on the air flow side. Expanding aluminum fins on the outside of the copper tube to form a finned tube is to effectively increase the convective heat transfer area and heat transfer coefficient of the copper tube to the air flow, thereby enhancing the heat exchange function of the copper tube.

[0122] ② Thermal bridge function

[0123] The fins on the finned tube heat exchanger 1 also function as thermal bridges, transferring heat from the copper tube containing the high-temperature refrigerant to the relatively cooler copper tube. For example, regarding the temperature difference between the refrigerant flow and the air flow in the condenser, the aluminum fins reduce the temperature difference between the high-temperature refrigerant pipe and the air flow in the superheated heat release section of each branch (flow path), and increase the temperature difference between the low-temperature refrigerant pipe and the air flow in the subcooled heat release section, thus playing a role in "peak shaving and valley filling" for different heat transfer temperature difference regions of the finned tube. This "thermal bridge function" of the finned tube is a "byproduct" function of the finned tube structure and is detrimental to enhancing heat transfer.

[0124] Typically, the design and use of finned tube heat exchangers in air conditioning projects need to ensure and enhance heat exchange function and suppress or even eliminate thermal bridge function.

[0125] Comparative example:

[0126] When the existing finned tube heat exchanger 1 is used as a condenser, the heat from the high-temperature, high-pressure refrigerant gas inside the tubes at the beginning of each refrigerant branch 11 is released to the air (ventilation airflow) through the copper tubes and the outer fins, and is also transferred to the condensate in the end pipe of the adjacent refrigerant branch 11 through the fin thermal bridge; in particular, the end pipe (subcooled section) of each refrigerant branch 11 is connected to the inlet pipe of the high-temperature refrigerant gas of the next branch through the adjacent fins. While the subcooled section copper tubes and finned tubes enhance the "subcooling and heat release" of the ventilation airflow, the heat is also passively transferred to the condensate in the end pipe of the adjacent refrigerant branch 11. The high-temperature, high-pressure refrigerant gas in the inlet pipe of the next refrigerant branch 11, which is adjacent to it, is conducted through the finned thermal bridge. The finned thermal bridge is very short and has a large temperature difference (up to 50°C or more). This causes the condensate in the subcooled section to release heat to the ventilation airflow through the finned assembly while simultaneously absorbing heat from the high-temperature, high-pressure refrigerant gas through the finned thermal bridge. This makes it difficult to implement the "subcooling operation" in depth. The condensate at the condenser outlet is not "subcooled" enough, which increases the "dryness" of the refrigerant at the outlet of the expansion valve and reduces the amount of heat absorbed by the condensate entering the evaporator and the amount of heat released by the condenser.

[0127] Similarly, when the finned tube heat exchanger 1 is operating as an evaporator, the refrigerant two-phase flow in the evaporation section also absorbs heat from the superheated section at the end of the evaporator through the finned thermal bridge, thereby reducing the "superheat" of the refrigerant vapor at the evaporator outlet and reducing the heat absorbed by the evaporator and the heat released by the condenser.

[0128] Data from the standard test conditions for air conditioning compressors also confirms the above situation.

[0129] The internationally accepted standard test condition for air conditioner compressors is defined as follows: "Under an ambient temperature of 35°C, the condenser temperature is 54.4°C, the condensate subcooling is 8.3°C, the evaporator temperature is 7.2°C, and the evaporator low-pressure steam superheat is 11.1°C." Under this standard test condition, the condensate at the condenser terminal, cooled by the 35°C ambient air, can only be subcooled to 46.1°C, with a subcooling of only 8.3°C. Under cross-flow heat exchange operation, facing the 35°C heat-absorbing air, the condensate at the condenser outlet can only be reduced to 46.1°C, which is more than 11°C higher than the temperature of the cooling medium (ambient air) of 35°C. This is sufficient to prove that the overall isothermal characteristics of the current finned tube condenser's copper-aluminum metal structure have a very strong resistance to "condensate subcooling and heat release."

[0130] This embodiment further analyzes, such as Figure 8 As shown, the existing single-plate finned tube heat exchanger (condenser) has a three-stage heat release system along the pipe direction in one refrigerant branch 11 (sub-heat exchanger). The following problems have been found:

[0131] A single-row finned tube heat exchanger (condenser) has one branch (sub-heat exchanger, with continuous fins and intact fin thermal bridges) among multiple refrigerant branches 11. The heat exchange temperature field extends along the length of the tube in a three-section configuration:

[0132] The section from a to b is the superheated heat release section, corresponding to the head of the condenser. It releases the high-temperature sensible heat of the high-temperature, high-pressure refrigerant gas discharged from the compressor. The heat mainly comes from the compression work of the compressor. Because the finned tubes in this section conduct heat to the nearby low-temperature finned tubes through the finned thermal bridge while also releasing heat to the ventilation airflow, the wall temperature of the finned tubes in this section is lowered and the heat transfer temperature difference to the ventilation airflow is reduced. This results in a decrease in the heat released directly to the ventilation airflow by the finned tubes in this section, and part of the load is transferred to the relatively low-temperature finned tubes in the adjacent area through the finned thermal bridge.

[0133] b→c is the condensation heat release section, corresponding to the middle of the condenser, where the condensation phase change heat of the high-pressure refrigerant gas is released. The heat mainly comes from the heat absorption of the evaporator in the low-temperature region.

[0134] The c→d section is the subcooling heat release section, corresponding to the end of the condenser, where the sensible heat of the high-pressure condensate is released. The heat mainly comes from the heat absorption of the evaporator in the low-temperature zone. The pipe at the end of each refrigerant branch 11 (subcooling section) is connected to the inlet pipe of the high-temperature refrigerant gas of the next refrigerant branch 11 through fins. It passively receives the heat conducted by the high-temperature and high-pressure refrigerant gas in the inlet pipe of the adjacent next refrigerant branch 11 through the fin thermal bridge. Moreover, the fin thermal bridge is very short and the temperature difference of conduction is extremely large (up to 50°C or more). As a result, the condensate in the subcooling section is simultaneously subcooled and released to the ventilation airflow through the fin assembly and heated by the high-temperature and high-pressure refrigerant gas in the adjacent branch through the fin thermal bridge, making it difficult to implement the "subcooling operation" in depth.

[0135] like Figures 5-13 This embodiment innovatively proposes:

[0136] A finned tube heat exchanger assembly includes three flat-plate finned tube heat exchangers 1, one liquid manifold 2, and one gas manifold 3.

[0137] The finned tube heat exchanger 1 can be a single-row, double-row, or triple-row finned tube heat exchanger 1;

[0138] The flat plate finned tube heat exchanger 1 includes several refrigerant branches 11; the refrigerant branches 11 between different flat plate finned tube heat exchangers 1 are connected in series through refrigerant bridge pipes 12.

[0139] The refrigerant branch 11 connects to the liquid distribution lotus head 2 and the gas distribution pipe 3 to form a finned tube heat exchanger assembly.

[0140] The liquid distribution lotus head 2 and the gas distribution pipe 3 are respectively installed at the end plate 13 of different flat plate finned tube heat exchangers 1.

[0141] Any refrigerant branch 11 between the liquid distribution lotus head 2 and the gas distribution pipe 3 is segmented and installed in each flat plate finned tube heat exchanger 1.

[0142] The total length of the refrigerant piping in any refrigerant branch 11 between the liquid distribution lotus head 2 and the gas distribution pipe 3 is equal or substantially equal.

[0143] Adjacent flat plate finned tube heat exchangers 1 are connected to refrigerant branches 11 via refrigerant bridge pipes 12. The superheating heat exchange section, phase change heat exchange section, and subcooling heat exchange section of any refrigerant branch 11 from the gas distribution pipe 3 to the liquid distribution lotus head 2 are distributed and arranged in each flat plate finned tube heat exchanger 1.

[0144] Structurally, this embodiment starts from the liquid distribution lotus head 2, and connects to the pipe openings and pipes corresponding to several refrigerant branches on the end plate of the first flat plate finned tube heat exchanger 1 on the side adjacent to the liquid distribution lotus head 2 through several narrow-diameter liquid distribution pipes. Then, it connects to the corresponding pipe openings and pipes of several refrigerant branches on the second / third flat plate finned tube heat exchanger 1 through several refrigerant bridging pipes 12 in sequence, until it connects to the corresponding pipes and pipe openings on the other side of the flat plate finned tube heat exchanger 1 on the adjacent gas distribution pipe 3 through several refrigerant bridging pipes 12 in sequence, and finally connects to the gas distribution pipe 3.

[0145] This embodiment uses only one set of liquid distribution lotus head 2 and gas distribution pipe 3 to implement liquid distribution and gas distribution for each refrigerant branch 11 arranged on 2 / 3 / 4 flat finned tubes of the finned tube heat exchanger assembly. Furthermore, the liquid distribution lotus head 2 and gas distribution pipe 3 are arranged on opposite sides, that is, far apart, and are located on two sides of the finned tube heat exchanger assembly. This embodiment simplifies the external heat exchanger structure, improves the uniformity of refrigerant liquid distribution (as an evaporator) and refrigerant gas distribution (as a condenser), and improves the subcooling of the condensate when used as a condenser and the superheat of the vapor when used as an evaporator.

[0146] This embodiment further analyzes the relationship between the deep subcooling of the condensate in the refrigeration system and the evaporator's cooling capacity:

[0147] The cooling capacity of the evaporator in a refrigeration system is the product of the refrigerant circulation rate and the enthalpy difference between the refrigerant at the inlet and outlet of the evaporator. This enthalpy difference is negatively correlated with the "dryness" of the refrigerant entering the evaporator from the outlet of the expansion valve.

[0148] The refrigerant dryness fraction at the evaporator inlet refers to the proportion of gaseous refrigerant at the outlet of the expansion valve in the gas-liquid two-phase flow of the refrigerant. The lower the dryness fraction, the closer it is to 0, meaning a low gaseous proportion (close to 0) and a high liquid proportion (close to 1.0). This results in a higher degree of "completeness" of refrigerant evaporation in the evaporator, a larger enthalpy difference between the inlet and outlet of the evaporator, and a larger evaporator cooling capacity. Conversely, the higher the refrigerant dryness fraction at the evaporator inlet, the closer it is to 1, meaning a high gaseous proportion (close to 1) and a low liquid proportion (close to 0). This results in a lower degree of "completeness" of refrigerant evaporation in the evaporator, a smaller enthalpy difference between the inlet and outlet of the evaporator, and a smaller cooling capacity.

[0149] The refrigerant "dryness" at the throttling valve outlet (i.e., the evaporator inlet) is determined by the "subcooling" of the refrigerant at the condenser terminal. During the throttling and depressurization process in the throttling valve, in order to lower the temperature of the high-pressure, high-temperature condensate at the condenser outlet (i.e., the saturation temperature corresponding to the low-pressure state at the evaporator inlet), a portion of the condensate vaporizes during the throttling process. This vaporization absorbs heat, cooling most of the condensate. Consequently, the refrigerant injected into the evaporator inlet from the throttling valve outlet is not a liquid refrigerant with a dryness of 0, but rather a two-phase flow of gas and liquid with a dryness of x. The dryness x can be 0.2 (0.8% liquid content), 0.3 (0.7% liquid content), 0.4 (0.6% liquid content), or even 0.5 (0.5% liquid content).

[0150] The refrigerant dryness fraction (x) at the throttling valve outlet and evaporator inlet is determined by the "subcooling" of the condensate at the condenser terminal. If the condensate at the condenser terminal releases heat sufficiently and its temperature drops significantly (significantly below the condensation temperature), it has a high "subcooling." As the condensate enters the evaporator through the throttling valve, the temperature difference between the condensate terminal temperature and the evaporation temperature is small, resulting in less heat release. Consequently, the proportion of refrigerant undergoing a phase change and absorbing heat through vaporization in the throttling valve is relatively low, and the refrigerant dryness fraction (x) at the evaporator inlet is correspondingly low, even as low as 0.2 or below. This results in a relatively low proportion of liquid phase in the two-phase flow of the refrigerant entering the evaporator. A larger subcooling value results in a larger evaporator cooling capacity; conversely, if the condensate at the condenser terminal does not release heat sufficiently and its temperature is too high (not significantly lower than the condensing temperature), meaning the condensate has a low "subcooling," the temperature difference between the condensate at the condenser terminal and the evaporating temperature is large, resulting in a large heat release. Consequently, a relatively high proportion of the condensate undergoes a "phase change" and vaporizes to absorb heat when passing through the condenser terminal, leading to a correspondingly higher refrigerant dryness fraction (x) at the evaporator inlet, reaching 0.3 or even above 0.4. This results in a lower proportion of liquid phase in the two-phase flow of refrigerant entering the evaporator, and thus a smaller evaporator cooling capacity.

[0151] This embodiment closely adheres to the core concept of "reducing the dryness of the two-phase refrigerant flow at the outlet of the throttling valve". The technical solution of this embodiment improves the subcooling of the condensate at the end of the condenser, reduces the vaporization ratio of the condensate in the throttling valve, reduces the dryness of the two-phase refrigerant flow at the outlet of the throttling valve, and increases the liquid phase ratio of the refrigerant at the inlet of the evaporator, thereby significantly improving the evaporator's cooling capacity.

[0152] This embodiment presents a finned tube heat exchanger assembly with ultra-high heat exchange efficiency, featuring a refrigerant bridge pipe 12 and liquid distribution lotus head 2 and gas distribution pipe 3 positioned far apart. This not only solves the refrigerant piping connectivity problem of copper tube N-shaped finned tube heat exchanger assemblies but also significantly improves the condensate subcooling, thereby increasing the evaporator cooling capacity and condenser heat release. Taking a standard test condition air conditioning system using 410A refrigerant as an example, the increase in cooling capacity brought about by this embodiment's technical solution is calculated:

[0153] ① Under an evaporation pressure of 10 atm, the evaporation temperature of R410a is 7.28℃ (close to the standard test condition of 7.2℃). If the dryness of the refrigerant at the evaporator inlet is set to 0.2, then the enthalpy difference (heat absorbed by evaporation) per unit mass of refrigerant at the evaporator inlet and outlet is (422.89-211.09)×0.8=211.8×0.8=169.44kJ / kg;

[0154] ② At a condensing pressure of 34.0 atm, the condensing temperature of R410A is 54.61℃ (close to the standard test condition of 54.4℃). The enthalpy difference (heat release) of the refrigerant per unit mass at the inlet and outlet of the condenser is 418.47-294.67=123.8kJ / kg, and the mass heat capacity of the refrigerant liquid is 2.49kJ / kg.

[0155] ③ In this embodiment, at an ambient temperature of 35℃, the condensate at the end of the condenser can be easily subcooled to 38℃, which is 8℃ more subcooled than the standard test condition of 46.1℃, increasing the enthalpy difference (heat release) of the condenser by 2.49×8=19.92kJ / kg;

[0156] ④ In this embodiment, the condensate at the end of the condenser is "subcooled" and releases heat, which reduces the refrigerant dryness at the outlet of the throttle valve and increases the proportion of liquid phase of the refrigerant entering the evaporator, thereby increasing the evaporator's cooling capacity by about 11.8%.

[0157] This embodiment analyzes the heat exchange process of a finned tube heat exchanger assembly with broken finned thermal bridges:

[0158] For a single-row copper tube aluminum finned heat exchanger consisting of multiple refrigerant branches 11, each of which is composed of multiple pipes, one of the refrigerant branches 11 (sub-heat exchangers) is isolated, and the fins between the pipes that make up this refrigerant branch 11 are disconnected for ventilation heat exchange test. For ease of illustration and analysis, in this embodiment, the pipes on the same refrigerant branch 11 with disconnected fins are unfolded into a straight finned tube heat exchanger 1 on the drawing. The temperature field structure of its ventilation heat exchange operation is shown below. Compared with the temperature field of a single branch of the existing finned tube heat exchanger 1 (fins not disconnected, fin thermal bridges intact), there is a huge difference.

[0159] In this embodiment, the refrigerant branch 11 with disconnected fins between the pipes exhibits a three-stage heat release:

[0160] like Figure 9 As shown, when a refrigerant branch 11 of the finned tube heat exchanger 1 is isolated and the fins between the various pipes constituting this refrigerant branch 11 are disconnected, a ventilation heat exchange test is conducted. The three-segment temperature field structure that unfolds along the length of the pipe during ventilation heat exchange operation is different from the "three-segment temperature field structure" along "refrigerant inside the pipe - copper pipe aluminum fins - airflow between fins" in the section with enhanced copper tube heat exchange function in Example 3. Compared with the heat exchange temperature field structure of a single refrigerant branch 11 of the existing finned tube heat exchanger 1 with intact fins and complete fin thermal bridges, a significant change has occurred:

[0161] a'→b' is the superheated heat release section of a refrigerant branch 11 in the condenser where the finned thermal bridge is broken. It corresponds to the head of the condenser and releases the high-temperature sensible heat of the high-temperature, high-pressure refrigerant gas discharged from the compressor. The heat mainly comes from the compression work of the compressor. Because the finned thermal bridge is broken, the heat of the high-temperature, high-pressure refrigerant gas in this section of the pipeline is not conducted to the low-temperature region through the finned thermal bridge. Therefore, the heat transfer temperature difference with the ambient temperature is large, and the heat release is large. The increase in heat release in this section also causes the starting point of the high-pressure refrigerant gas condensation process to move towards the condenser inlet (b→b').

[0162] b'→c' is the condensation heat release section of one refrigerant branch 11 of the condenser, which is disconnected by the finned thermal bridge. It corresponds to the middle of the condenser and releases the condensation phase change heat of the high-pressure refrigerant gas. The heat mainly comes from the heat absorption of the evaporator in the low-temperature region. Because the starting point of the high-pressure refrigerant gas condensation in the superheated heat release section moves towards the condenser inlet (b→b'), it also causes the ending point of the high-pressure refrigerant gas condensation phase change to move towards the condenser inlet (c→c').

[0163] c'→d' is the subcooling heat release section of a refrigerant branch 11 of the condenser with a broken fin thermal bridge. It corresponds to the end of the condenser and releases the sensible heat of the high-pressure condensate. The heat mainly comes from the heat absorption of the evaporator in the low-temperature zone. Because the end point of the high-pressure refrigerant gas condensation phase change in the condensation heat release section moves towards the condenser inlet (c→c'), the pipe length and fin area of ​​the subcooling heat release section are expanded. In addition, since the fins are broken, there is no heat conduction from the adjacent high-temperature zone along the fin thermal bridge to the finned tube of this section, which improves the subcooling heat release effect of this section. The "deep subcooling" of the condensate is achieved. The state corresponding point changes from d→d', and the subcooling degree also increases from ΔT to ΔT'.

[0164] The number of refrigerant branch lines 11 on each flat plate finned tube heat exchanger 1 can be equal or unequal. The number of copper tubes of each refrigerant branch line 11 on each flat plate finned tube heat exchanger 1 can be complementary. The total length of the copper tubes of each refrigerant branch line 11 on each flat plate finned tube heat exchanger 1 is equal or substantially equal.

[0165] This embodiment describes an N-shaped finned tube heat exchanger assembly with ultra-high heat exchange efficiency, featuring a refrigerant bridge pipe 12 and liquid distribution lotus head 2 and gas distribution pipe 3 positioned far apart. Its innovation lies in:

[0166] ① Set up a refrigerant overpass pipe 12 to pass through the refrigerant circuit of the three flat finned tube heat exchangers 1 of the N-shaped finned tube heat exchanger assembly, and separate the liquid distribution lotus head 2 and the gas distribution pipe 3 to both sides of the N-shaped finned tube heat exchanger assembly.

[0167] ② The superheating, condensing, and subcooling heat release sections of each refrigerant branch 11 are respectively installed on the 1st, 2nd, and 3rd flat plate finned tube heat exchangers 1. That is, the main body of the superheating section of each refrigerant branch 11 is centrally located (or basically located) on the 1st flat plate finned tube heat exchanger 1, the main body of the condensing heat release section of each refrigerant branch 11 is centrally located (or basically located) on the 2nd flat plate finned tube heat exchanger 1, and the main body of the subcooling heat release section of each refrigerant branch 11 is centrally located (or basically located) on the 3rd flat plate finned tube heat exchanger 1. On the finned tube heat exchanger 1, the refrigerant temperature of each refrigerant branch 11 on each flat finned tube heat exchanger 1 is relatively close, and the heat conduction intensity of the refrigerant in the direction perpendicular to the copper tube is greatly reduced. This not only retains the advantages of the fin group in expanding the surface area of ​​the copper tube and enhancing the heat exchange on the air side, but also effectively cuts off the fin thermal bridge from the midpoint of the adjacent copper tube, blocking the transfer of part of the heat load of the high-temperature finned tube to the adjacent low-temperature finned tube through the fin thermal bridge, thus solving the problem that "supercooled operation" is difficult to implement in depth.

[0168] This embodiment improves the heat release temperature difference and heat release of the superheated section of the condenser, increases the subcooling degree of the condensate in the subcooled section and the heat absorption of the evaporator, and can also improve the superheat of the evaporator outlet when the refrigeration system is used as a heat pump, improve operational safety and energy efficiency ratio.

[0169] Example 4

[0170] like Figures 14-16 As shown, this embodiment discloses an air conditioning unit including a housing 5, a negative pressure chamber 6, an exhaust chamber 7, a compressor chamber 8, a finned tube heat exchanger assembly of embodiment 2, and a fan 9;

[0171] The compressor chamber 8 and the exhaust chamber 7 are arranged side by side on the outside of the same first side plate 54 of the negative pressure chamber 6.

[0172] The exhaust port 71 of the exhaust chamber 7 and the main air inlet 101 of the air inlet chamber 10 of the housing 5 are located on opposite sides. The opposite sides are configured such that the exhaust port 71 and the main air inlet 101 face the same direction, for example, the exhaust port 71 and the main air inlet 101 are both located on the short side of the housing.

[0173] The air intake direction of the fan 9 is orthogonal or nearly orthogonal to the main air outlet direction of the finned tube heat exchanger assembly, thus creating an airflow vortex between the air outlet of the finned tube heat exchanger assembly and the air intake of the fan 9 in the negative pressure chamber 6.

[0174] In the exhaust chamber 7, the fan 9 is located at one end near its exhaust port 71; the air outlet of the fan 9 is directly opposite the exhaust port 71 of the exhaust chamber 7; the exhaust port 71 of the exhaust chamber 7 is a vertical strip exhaust port.

[0175] The fan 9 is a centrifugal fan; preferably, a backward centrifugal fan is adopted; the area of ​​the exhaust surface on the outer periphery of the fan impeller is 2 to 8 times the area of ​​the air inlet of the fan 9.

[0176] The air conditioning unit in this embodiment is equipped with three vertically arranged fans 9.

[0177] The finned tube heat exchanger assembly is located in the air inlet cavity 10 of the shell 5;

[0178] The finned tube heat exchanger assembly includes a copper tube V-shaped finned tube heat exchanger. The copper tube V-shaped finned tube heat exchanger is an asymmetrical copper tube V-shaped finned tube heat exchanger with unequal lengths on both sides, consisting of two flat plate finned tube heat exchangers 1 of different lengths;

[0179] Among them, the long flat plate finned tube heat exchanger 1 is close to the outer side plate 53 of the shell 5; the short flat plate finned tube heat exchanger 1 is close to the first side plate 54 of the exhaust cavity 7.

[0180] The air inlet cavity 10 of the shell 5 is also provided with an air supply strip 51; the air supply strip 51 is located on the outer side plate 53 of the shell 5 near the long flat plate finned tube heat exchanger 1.

[0181] The air intake and air guide panel of the fan 9 are wedged into the negative pressure chamber 6, and part of the space of the compressor chamber 8 is wedged into the negative pressure chamber 6.

[0182] In this embodiment, the air conditioning unit adopts a technology where the air outlet direction of the finned tube heat exchanger is orthogonal to the air inlet direction of the fan 9, and the air inlet and outlet are far apart. The refrigerant circuit adopts a technology where the refrigerant bridge pipe 12, the liquid distribution lotus head 2, and the gas distribution pipe 3 are far apart. This creates a completely new structure for the airflow field, refrigerant flow field, and temperature field, promoting the simplification and efficiency of the unit structure, and realizing the structural coupling, airflow coupling, and energy coupling between the air conditioning unit and the equipment platform.

[0183] On the air path side, this embodiment adopts an air path technology in which the air intake direction of the fan 9 is orthogonal (or nearly orthogonal) to the air outlet direction of the finned tube heat exchanger 1. The space between the air outlet of the heat exchanger and the air intake of the backward centrifugal fan 9 becomes a buffer airflow vortex in the air path of the external heat exchanger, which becomes the structural conversion zone and functional conversion zone in the air path, and becomes a buffer chamber for deceleration, pressurization, adjustment and reorganization of the airflow at the outlet of the external heat exchanger.

[0184] On the air duct side, this embodiment uses the air inlet cavity and negative pressure cavity 6 of the external heat exchanger of the air conditioning unit in series, and then connects them in series with the exhaust cavity 7 through the fan 9. The air inlet cavity, negative pressure cavity 6 and exhaust cavity 7 are arranged in sequence. In the exhaust cavity 7, the circumferential surface of the impeller of the backward centrifugal fan 9 is directly opposite the exhaust port of the exhaust cavity 7. On the outside of the exhaust cavity 7 facing away from the exhaust port, the compressor cavity 8 is arranged. The compressor cavity 8 and the centrifugal fan cavity 9 are arranged in a rearward and side by side, which greatly reduces or even eliminates the longitudinal exhaust cavity 7 outside the fan 9, thereby greatly reducing the size, structure and volume of the air conditioning unit.

[0185] On the fluorine side, the finned tube heat exchanger assembly technology with ultra-high heat exchange efficiency, which uses the refrigerant bridge pipeline 12 and the liquid distribution lotus head 2 and gas distribution pipe 3 set far apart, is adopted in Example 2. Only one set of liquid distribution lotus head 2 and gas distribution pipe 3 is used to implement liquid distribution and gas distribution for each refrigerant branch 11 arranged on the two flat finned tube heat exchangers 1 of the copper tube V-shaped finned tube heat exchanger assembly. Furthermore, the liquid distribution lotus head 2 and gas distribution pipe 3 are set on opposite sides, that is, far apart, and are set on the two sides of the two finned tube heat exchangers 1 of the V-shaped finned tube heat exchanger assembly.

[0186] From the perspective of the fluorine circuit structure, this embodiment starts from the liquid distribution lotus head 2, and connects to the pipe openings and pipes corresponding to the refrigerant branches 11 on the end plate 13 of the first flat plate finned tube heat exchanger on the side adjacent to the liquid distribution lotus head 2 through several small diameter liquid distribution pipes. Then, it connects to the corresponding pipe openings and pipes of the refrigerant branches 11 on the second flat plate finned tube heat exchanger 1 through several refrigerant bridge pipes 12 in sequence, and finally connects to the gas distribution pipe 3.

[0187] On the refrigerant side, this embodiment also adopts a "back-to-back" arrangement technology for each refrigerant branch 11 in the adjacent manifold 3 flat finned tube heat exchanger 1. When used as the end of the condenser, since the inlet pipes and outlet pipes of the condensate of the two adjacent refrigerant branches 11 are arranged "back-to-back", the temperature gradient on the fin assembly between the inlet pipe with the higher temperature and the outlet pipe with the lowest temperature is the smallest, the heat transfer intensity is the lowest, and the "subcooling depth" of the condensate at the condenser outlet is further increased, thereby further improving the evaporator cooling capacity.

[0188] This embodiment represents a revolutionary technological leap forward compared to the existing air conditioning unit that uses an axial flow fan with nine side air outlets:

[0189] (1) On the air duct side, an airflow vortex chamber is set on the air duct side of the external heat exchanger of the air conditioning unit, the spatial relationship between the air inlet cavity, the negative pressure cavity 6 and the exhaust cavity 7 is adjusted, the spatial relationship between the compressor cavity 8 and the exhaust cavity 7 is adjusted, the vertical exhaust cavity 7 of the air conditioning unit in the prior art is removed, the longitudinal depth of the unit is reduced, and the structural complementary design of the air inlet cavity, the negative pressure cavity 6 and the exhaust cavity 7, and the structural complementary design of the compressor cavity 8 and the exhaust cavity 7 are further promoted.

[0190] (2) On the fluorine side, by setting up a refrigerant bridge pipeline 12 connecting the V-shaped flat plate finned tube heat exchangers 1 on both sides and setting the liquid distribution lotus head 2 and the gas distribution pipe 3 far apart, and the back-to-back structure design of each refrigerant branch 11 subcooling section on the finned tube heat exchanger 1 adjacent to the gas distribution pipe 3, the number of lotus head gas distribution pipes 3 is reduced.

[0191] This embodiment simplifies the structure of the external heat exchanger of the air conditioning unit through the above-mentioned disruptive innovations on the air duct side and the refrigerant duct side, improves the uniformity of the operation of distributing refrigerant (as an evaporator) and distributing refrigerant gas (as a condenser), and improves the subcooling of the condensate when used as a condenser and the superheat of the vapor when used as an evaporator, thereby improving the energy efficiency ratio of the refrigeration and air conditioning system and realizing the compact design of the air conditioning unit structure and high-efficiency operation under heavy load.

[0192] Example 5

[0193] like Figures 17-21 As shown, the finned tube heat exchanger assembly of this embodiment includes a finned tube heat exchanger 1, a liquid distribution lotus head 2, and a gas distribution pipe 3.

[0194] The finned tube heat exchanger 1 can be a single-row, double-row, or triple-row finned tube heat exchanger 1;

[0195] The finned tube heat exchanger 1 includes several refrigerant branches 11; the liquid interface of each refrigerant branch 11 is connected to the liquid manifold 2, and the gas interface of the refrigerant is connected to the gas manifold 3; the liquid manifold 2 and the gas manifold 3 are located on the same side end plate 13 of the finned tube heat exchanger 1.

[0196] The refrigerant liquid pipes 14 of the two refrigerant branches 11 and the connecting manifold 2 are arranged adjacent to each other on the same set of fins on the same row of finned tube heat exchanger 1.

[0197] Two adjacent refrigerant branches 11 form a refrigerant piping module unit 16. Two refrigerant liquid pipes 14 in the refrigerant piping module unit 16 are arranged adjacent to each other on the same set of fins on the same row of finned tube heat exchanger 1; or, the two refrigerant liquid pipes 14 of the two adjacent refrigerant piping module units 16 are arranged adjacent to each other on the same set of fins on the same row of finned tube heat exchanger 1.

[0198] Two adjacent refrigerant pipes 15 connected to the gaseous refrigerant interfaces of the refrigerant piping module unit 16 are arranged adjacently on the same set of fins on the same row of finned tube heat exchanger 1; or, the two refrigerant pipes 15 of the refrigerant piping module unit 16 are arranged adjacently on the same set of fins on the same row of finned tube heat exchanger 1.

[0199] The refrigerant circuit structure of the finned tube heat exchanger assembly in this embodiment is characterized by:

[0200] (1) The finned tube heat exchanger 1 adopts a single flat plate double row (or triple row) finned tube, or an L-shaped double row (or triple row) finned tube formed by rolling the flat plate finned tube heat exchanger 1. The liquid distribution lotus head 2 and the gas distribution pipe 3 are arranged adjacent to each other on the same side end plate 13 of the finned tube heat exchanger 1.

[0201] (2) The finned tube heat exchanger 1 used is composed of several refrigerant branches 11; the refrigerant liquid pipe 14 of each refrigerant branch 11 is connected to the liquid distribution lotus head 2, and the refrigerant gas pipe 15 is connected to the gas distribution pipe 3.

[0202] (3) Two adjacent refrigerant branches 11 form a refrigerant pipeline module unit 16. The pipelines (i.e., refrigerant liquid pipes 14) connected by the fluorine liquid interface of the two refrigerant branches 11 in the refrigerant pipeline module unit 16 are set "back to back", while the pipelines (i.e., refrigerant gas pipes 15) connected by the fluorine gas interface are set far apart.

[0203] (4) Two adjacent refrigerant piping module units 16 are connected by refrigerant gas interfaces (i.e., refrigerant gas pipes 15).

[0204] This embodiment discloses an air conditioning unit, including a housing 5, a negative pressure chamber 6, an exhaust chamber 7, a compressor chamber 8, a finned tube heat exchanger assembly of this embodiment 5, and a fan 9;

[0205] The compressor chamber 8 and the exhaust chamber 7 are arranged side by side on the outside of the same first side plate 54 of the negative pressure chamber 6.

[0206] The exhaust port 71 of the exhaust chamber 7 is located on the third back plate 54 of the exhaust chamber, which is opposite to the main air inlet 101 of the air inlet chamber 10 of the housing 5.

[0207] The exhaust vent 71 and the main air inlet 101 are set to face different directions. The main air inlet 101 is located on the long side of the housing 5, and the exhaust vent 71 is located on the short side of the housing 5.

[0208] The air intake direction of the fan 9 is orthogonal or nearly orthogonal to the main air outlet direction of the finned tube heat exchanger assembly, thus creating an airflow vortex between the air outlet of the finned tube heat exchanger assembly and the air intake of the fan 9 in the negative pressure chamber 6.

[0209] In the exhaust chamber 7, the fan 9 is located at one end near its exhaust port 71; the air outlet of the fan 9 is directly opposite the exhaust port 71 of the exhaust chamber 7; the exhaust port 71 of the exhaust chamber 7 is a vertical strip exhaust port.

[0210] The fan 9 is a centrifugal fan; preferably, a backward centrifugal fan is adopted; the area of ​​the exhaust surface on the outer periphery of the fan impeller is 2 to 8 times the area of ​​the air inlet of the fan 9.

[0211] The air conditioning unit in this embodiment is equipped with three vertically arranged fans 9.

[0212] The finned tube heat exchanger assembly is disposed in the air inlet cavity 10 of the shell 5, and forms a certain angle α with the main air inlet surface of the air inlet cavity 10 of the shell, wherein the angle α is an acute angle. More preferably, the angle α is 15°-70°.

[0213] The air conditioning unit in this embodiment has a distinctive airflow structure:

[0214] ① The air inlet chamber and negative pressure chamber 6 of the external heat exchanger of the air conditioning unit are connected in series, and then connected in series with the exhaust chamber 7 through the fan 9. The air inlet chamber, negative pressure chamber 6 and exhaust chamber 7 are arranged in sequence. In the exhaust chamber 7, the circumferential surface of the impeller of the backward centrifugal fan 9 is directly opposite the exhaust port of the exhaust chamber 7. The compressor chamber 8 is set on the outside of the exhaust chamber 7 facing away from the exhaust port.

[0215] ② In this embodiment, the compressor chamber 8 and the centrifugal fan 9 are arranged at the rear and side by side, which greatly reduces or even eliminates the longitudinal exhaust chamber 7 outside the fan 9, thereby greatly reducing the size, structure and volume of the air conditioning unit;

[0216] ③ In this embodiment, by setting up an airflow vortex chamber, adjusting the spatial relationship between the air inlet cavity negative pressure cavity 6 and the exhaust cavity 7, and adjusting the spatial relationship between the compressor cavity 8 and the exhaust cavity 7, the vertical exhaust cavity 7 of the air conditioning unit in the background technology is eliminated, the longitudinal depth of the air conditioning unit is reduced, and the structural complementary design of the compressor cavity 8 and the exhaust cavity 7 is further promoted, making it possible to have a structurally compact wall-mounted air conditioning unit.

[0217] When the air conditioner unit is in cooling mode in this embodiment, the high-temperature and high-pressure refrigerant gas discharged from the compressor 4 is sent into the refrigerant pipeline module unit 16 in the condenser. Two pipelines with refrigerant gas interfaces are connected and are located far apart. One high-temperature and high-pressure refrigerant gas moves forward along the pipeline and runs downward along each pipeline. The other high-temperature and high-pressure refrigerant gas moves forward along the pipeline and runs upward along each pipeline. Finally, it flows into the adjacent condenser end pipeline, enters the lotus head to collect, and is discharged from the condenser.

[0218] In the current finned tube condenser, the end of each refrigerant circuit branch (subcooled section) is connected to the inlet pipe of the next branch's high-temperature refrigerant gas via fins. It passively receives heat from the high-temperature, high-pressure refrigerant gas in the adjacent branch's inlet pipe, which is conducted through the fin thermal bridge. Furthermore, the fin thermal bridge is very short and has an extremely large temperature difference (up to 50°C or more). This causes the condensate in the subcooled section to simultaneously subcool and release heat to the ventilation airflow through the fin assembly while being heated by the high-temperature, high-pressure refrigerant gas in the adjacent branch through the fin thermal bridge, making it difficult to implement the "subcooling operation" in depth.

[0219] In this embodiment, the refrigerant liquid pipes (i.e., refrigerant liquid pipes 14) connected by the liquid interfaces of the two refrigerant branches 11 in the refrigerant piping module unit 16 are arranged in a "back-to-back" configuration. That is, when used as a condenser, the end condensate pipes (i.e., refrigerant liquid pipes 14) of the two refrigerant branches 11 are arranged "back-to-back". In addition, the high-temperature and high-pressure refrigerant gas inlet pipes (i.e., refrigerant gas pipes 15) connected by the gas interfaces of two adjacent refrigerant piping module units 16 are also arranged "back-to-back". In summary, the fin length between the high-temperature gas inlet pipe and the lowest-temperature liquid outlet pipe on each refrigerant branch 11 is large, the temperature gradient on the fin group is small, the heat conduction intensity is low, and the "subcooling depth" of the condensate at the condenser outlet is further increased, thereby further improving the evaporator's cooling capacity.

[0220] In this embodiment, when the air conditioning unit is running, in the air duct of the external heat exchanger, the ambient air is drawn by the negative pressure of the fan 9 through the narrow air duct of the finned tube heat exchanger 1 and the negative pressure chamber, obtaining a speed and dynamic pressure head of about 4 m / s; the main airflow reaching the air outlet of the external heat exchanger has a further increased speed of about 6 m / s, and inertially rushes towards the opposite airflow vortex chamber wall plate, where it is blocked, decelerated, and reflected by the opposite wall plate, and directly drives the air intake of the fan 9; especially in the vertical direction, the inertial airflow between adjacent air intakes of the fan 9, between the air intake of the high-position fan 9 and the top plate of the airflow vortex chamber (close to the main unit cover plate), and between the air intake of the low-position fan 9 and the bottom plate of the airflow vortex chamber (close to the main unit chassis), after being blocked, decelerated, and reflected by the opposite wall plate, flows to the air intake area of ​​the fan 9 adjacent to the opposite wall plate, realizing the deceleration, pressurization, reorganization, and redistribution of the heat exchange airflow in the airflow vortex chamber, improving the uniformity and stability of the airflow inflow into the air intake of the fan 9;

[0221] In this embodiment, when the air conditioner's heat exchanger is running, air enters from one side of the finned tube heat exchanger 1 and exits from the opposite side. The airflow lines entering the fin gaps intersect the plane where the fins are located at obtuse angles. The fins "obliquely cut" the airflow lines with a speed of about 4 m / s. Furthermore, the massive number of fin planers on the finned tube heat exchanger 1 progressively plan the airflow lines, and then each planed "shaving-like" airflow is stuffed into a corresponding fin gap to implement "low-speed air distribution" of about 1.5 m / s in the fin gaps. When the airflow lines leave the fin gaps after heat exchange, they are once again "obliquely cut" by the long side of the fins, and after turning, they enter the air intake of the centrifugal fan 9. The heat-exchanged airflow is pressurized by the centrifugal fan 9 and discharged into the exhaust chamber 7, and then injected into the ambient atmosphere at high speed for diffusion and dilution.

[0222] The advantage of this embodiment is that by simply swapping the inlet and outlet of about half of the refrigerant branches 11 on the finned tube heat exchanger 1, the fin length between the high-temperature inlet pipe (i.e., refrigerant gas pipe 15) and the lowest-temperature liquid outlet pipe (i.e., refrigerant liquid pipe 14) on each refrigerant branch 11 is increased, the temperature gradient on the fin group is reduced, the heat conduction intensity along the fin direction is reduced, and the "subcooling depth" of the condensate at the condenser outlet is further increased, thereby further improving the evaporator cooling capacity.

[0223] Example 6

[0224] like Figure 22 As shown, the finned tube heat exchanger assembly of this embodiment includes several flat finned tube heat exchangers 1, liquid distribution lotus heads 2, and gas distribution pipes 3.

[0225] The finned tube heat exchanger 1 can be a single-row, double-row, or triple-row finned tube heat exchanger 1;

[0226] The flat plate finned tube heat exchanger 1 includes several refrigerant branches 11; the refrigerant branches 11 between different flat plate finned tube heat exchangers 1 are connected in series through refrigerant bridge pipes 12; the refrigerant branches 11 are connected to the liquid distribution lotus head 2 and the gas distribution pipe 3 to form a finned tube heat exchanger assembly.

[0227] The liquid distribution lotus head 2 and the gas distribution pipe 3 are respectively installed at the end plate 13 of different flat plate finned tube heat exchangers 1.

[0228] Adjacent flat-plate finned tube heat exchangers 1 are connected by refrigerant crossover pipes 12 to refrigerant branches 11. The superheating heat exchange section, phase change heat exchange section, and subcooling heat exchange section of any refrigerant branch 11 from the manifold 3 to the liquid manifold 2 are distributed and arranged in each flat-plate finned tube heat exchanger 1; or, any refrigerant branch 11 from the liquid manifold 2 to the manifold 3 is arranged in sections in each flat-plate finned tube heat exchanger 1.

[0229] In this embodiment, the condenser uses a back-to-back arrangement for each refrigerant branch pipe in the flat-plate finned tube heat exchanger 1 adjacent to the manifold 3. Similarly, the condensation and heat release sections of two adjacent refrigerant branches 11 in the middle of the condenser are also arranged back-to-back. Furthermore, the condensate outlet pipes (i.e., refrigerant liquid pipes 14) of two adjacent refrigerant branches in the flat-plate finned tube heat exchanger 1 at the end of the condenser are also arranged back-to-back. This arrangement fully utilizes the increased heat exchange area of ​​the finned tube heat exchanger while eliminating the limitations of existing finned tube heat exchangers. Finned tube condensers typically suffer from the problem of high-temperature, high-pressure refrigerant gas conducting heat through the finned thermal bridge to the condensate in the copper tube during the subcooling and heat release phase, hindering the deep subcooling of the condensate and reducing the evaporator's cooling capacity. Furthermore, in the flat-plate finned tube heat exchanger 1 used as the subcooling and heat release section adjacent to the liquid distribution lotus head 2, the temperature gradient on the finned tube assembly between the slightly higher-temperature inlet pipe and the lowest-temperature outlet pipe of each refrigerant branch 11 is minimal, resulting in the lowest heat transfer intensity. This further deepens the "subcooling depth" of the condensate at the condenser outlet, thereby further increasing the evaporator's cooling capacity.

[0230] The refrigerant liquid pipes 14 of the two refrigerant branches 11 and the connecting manifold 2 are arranged adjacent to each other on the same set of fins on the same row of finned tube heat exchanger 1.

[0231] The refrigerant gas pipes 15 of the connecting manifold 3 of the two refrigerant branches 11 are arranged far apart on the same set of fins on the same row of finned tube heat exchanger 1.

[0232] The structure of the finned tube heat exchanger assembly with ultra-high heat exchange efficiency, which is equipped with refrigerant bridge pipe 12 and manifold lotus head 2 and manifold gas distribution pipe 3, is a copper tube M-shaped combination of four flat plate finned tube heat exchangers 1 and their respective refrigerant branches 11; each branch has 4×3 copper tubes; the refrigerant branch pipes in the flat plate finned tube heat exchangers adjacent to the manifold gas distribution pipe 3 are arranged back to back.

[0233] Example 7

[0234] like Figure 23 As shown, a finned tube heat exchanger assembly of this embodiment includes a finned tube heat exchanger 1, a liquid distribution lotus head 2, and a gas distribution pipe 3.

[0235] The finned tube heat exchanger 1 is an L-shaped double-row finned tube heat exchanger 1 formed by rolling flat plate finned tube heat exchanger 1.

[0236] The finned tube heat exchanger 1 includes several refrigerant branches 11; the liquid interface of each refrigerant branch 11 is connected to the liquid manifold 2, and the gas interface of the refrigerant branch is connected to the gas manifold 3; the liquid manifold 2 and the gas manifold 3 are located on the same end plate 13 of the finned tube heat exchanger 1; the refrigerant liquid pipes 14 of the two refrigerant branches 11 connected to the liquid manifold 2 are arranged adjacent to each other on the same set of fins on the same row of finned tube heat exchangers 1.

[0237] Two adjacent refrigerant branches 11 form a refrigerant piping module unit 16. Two refrigerant liquid pipes 14 in the refrigerant piping module unit 16 are arranged adjacent to each other on the same set of fins on the same row of finned tube heat exchanger 1; or, the two refrigerant liquid pipes 14 of the two adjacent refrigerant piping module units 16 are arranged adjacent to each other on the same set of fins on the same row of finned tube heat exchanger 1.

[0238] Two adjacent refrigerant pipes 15 connected to the gaseous refrigerant interfaces of the refrigerant piping module unit 16 are arranged adjacently on the same set of fins on the same row of finned tube heat exchanger 1; or, the two refrigerant pipes 15 of the refrigerant piping module unit 16 are arranged adjacently on the same set of fins on the same row of finned tube heat exchanger 1.

[0239] The refrigerant circuit structure of the finned tube heat exchanger assembly in this embodiment is characterized by:

[0240] (1) The finned tube heat exchanger 1 is an L-shaped double-row finned tube heat exchanger 1 formed by rolling flat plate finned tube heat exchanger 1. On the same side end plate 13 of the finned tube heat exchanger 1, the liquid distribution lotus head 2 and the gas distribution pipe 3 are arranged adjacent to each other.

[0241] (2) The finned tube heat exchanger 1 used consists of several refrigerant branches 11; the liquid interface of each refrigerant branch 11 is connected to the liquid distribution lotus head 2, and the gas interface of the refrigerant is connected to the gas distribution pipe 3.

[0242] (3) Two adjacent refrigerant branches 11 form a refrigerant pipeline module unit 16. The refrigerant pipeline module unit 16 has its liquid refrigerant interface connected to the two branches in a "back-to-back" arrangement, and the refrigerant gas interface connected to the two branches is also "back-to-back" arranged.

[0243] like Figure 24 As shown, this embodiment discloses an air conditioning unit, including a housing 5, a negative pressure chamber 6, an exhaust chamber 7, a compressor chamber 8, a finned tube heat exchanger assembly of this embodiment, and a fan 9;

[0244] The negative pressure chamber 6 and the exhaust chamber 7 are arranged side by side; the exhaust port 71 of the exhaust chamber 7 is arranged side by side on the same side as the main air inlet 101 of the air inlet chamber of the housing 5, that is, the exhaust port 71 of the exhaust chamber 7 is located on the same side as the main air inlet 101 of the air inlet chamber of the housing 5.

[0245] The air intake direction of the fan 9 is orthogonal or nearly orthogonal to the main air outlet direction of the finned tube heat exchanger assembly, thus creating an airflow vortex between the air outlet of the finned tube heat exchanger assembly and the air intake of the fan 9 in the negative pressure chamber 6.

[0246] In the exhaust chamber 7, the fan 9 is located at the end away from its exhaust port 71; the air outlet of the fan 9 is directly opposite the exhaust port 71 of the exhaust chamber 7; the exhaust port 71 of the exhaust chamber 7 is a vertical strip exhaust port.

[0247] The compressor chamber 8 is located outside the first back plate 55 of the negative pressure chamber 6 and the exhaust chamber 7.

[0248] The fan 9 is a centrifugal fan; preferably, a backward centrifugal fan is adopted; the area of ​​the exhaust surface on the outer periphery of the impeller of the fan 9 is 2 to 8 times the area of ​​the air inlet of the fan 9.

[0249] The air conditioning unit in this embodiment is equipped with two vertically arranged fans 9.

[0250] The finned tube heat exchanger assembly is located in the air inlet cavity of the shell 5; one side of the finned tube heat exchanger assembly is close to the main air inlet 101.

[0251] The air inlet cavity of the housing 5 is also provided with a second air inlet 52; a throttling panel 56 is provided at the second air inlet 52; the throttling panel 56 is provided with areas of different throttling resistance;

[0252] like Figure 19 As shown, the area A, which is closest to the air intake of the fan 9 and has the smallest airflow turning angle, has a permeability of 20%-40% and the largest throttling resistance. As the distance between the heat exchange area on the finned tube heat exchanger and the air intake of the fan 9 gradually increases and the airflow turning angle increases, the permeability of the throttling panel 56 in the corresponding section increases accordingly. The permeability of the throttling panel 56 in areas B, C, and D increases to 40%-60%, 60%-70%, and 70%-80%, respectively.

[0253] In this embodiment, during the cooling operation of an air conditioning unit, the high-temperature, high-pressure refrigerant gas discharged from the compressor is sent to the refrigerant pipeline module unit 16 in the condenser. Two adjacent pipelines with refrigerant gas interfaces are connected in the same single-row finned tube heat exchanger 1. One high-temperature, high-pressure refrigerant gas moves forward along the pipeline and runs downward through each pipe, then crosses into the other single-row finned tube heat exchanger 1 and runs upward through each pipe. The other high-temperature, high-pressure refrigerant gas moves forward along the pipeline and runs upward through each pipe, then crosses into the other single-row finned tube heat exchanger 1 and runs downward through each pipe. Finally, it flows into the adjacent condenser end pipeline in the refrigerant pipeline module unit 16, exits the condenser in the same direction, and enters the manifold connector 2 for collection.

[0254] In this embodiment, the pipes connected to the liquid and gas interfaces of the two refrigerant branches 11 in the refrigerant piping module unit 16 of the double-row finned tube heat exchanger 1 are arranged back-to-back in the same single-row finned tube heat exchanger 1. That is, when used as a condenser, the end refrigerant liquid pipes 14 of the two refrigerant branches 11 are arranged back-to-back. Furthermore, the refrigerant gas pipes 15 of the two refrigerant branches 11 in the refrigerant piping module unit 16 are arranged back-to-back in another single-row finned tube heat exchanger 1 where the finned thermal bridge is broken. In summary, each In each refrigerant piping module unit 16, the high-temperature inlet pipe and the low-temperature outlet pipe on the two refrigerant branches 11 are set "back to back" on different single-row finned tube heat exchangers 1. This weakens the heat conduction of the refrigerant along the fins across the copper tubes and strengthens the heat exchange between the refrigerant and the ventilation airflow. The fin thermal bridge between the high-temperature inlet pipe and the lowest-temperature outlet pipe on the two refrigerant branches 11 in each refrigerant piping module unit 16 is broken, and the "subcooling depth" of the condensate at the outlet of the two refrigerant branches 11 is further increased, thereby further improving the cooling capacity of the system evaporator.

[0255] Example 8

[0256] like Figure 25 As shown, a copper tube M-type finned tube heat exchanger assembly includes four flat plate finned tube heat exchangers 1, a liquid distribution lotus head 2, and a gas distribution pipe 3.

[0257] The finned tube heat exchanger 1 can be a single-row, double-row, or triple-row finned tube heat exchanger 1;

[0258] The flat plate finned tube heat exchanger 1 includes several refrigerant branches 11; the refrigerant branches 11 between different flat plate finned tube heat exchangers 1 are connected in series through refrigerant bridge pipes 12; the refrigerant branches 11 are connected to the liquid distribution lotus head 2 and the gas distribution pipe 3 to form a finned tube heat exchanger assembly.

[0259] The liquid distribution lotus head 2 and the gas distribution pipe 3 are respectively installed at the end plate 13 of different flat plate finned tube heat exchangers 1.

[0260] Adjacent flat plate finned tube heat exchangers 1 are connected to refrigerant branches 11 via refrigerant bridge pipes 12, and the superheating heat exchange section, phase change heat exchange section, and subcooling heat exchange section of any refrigerant branch 11 from the gas distribution pipe 3 to the liquid distribution lotus head 2 are distributed and arranged in each flat plate finned tube heat exchanger 1.

[0261] Any refrigerant branch 11 between the liquid distribution lotus head 2 and the gas distribution pipe 3 is segmented and installed in each flat plate finned tube heat exchanger 1.

[0262] The refrigerant liquid pipes 14 of the two refrigerant branches 11 and the connecting manifold 2 are arranged adjacent to each other on the same set of fins on the same row of finned tube heat exchanger 1.

[0263] The total length of the refrigerant piping in any refrigerant branch 11 between the liquid distribution lotus head 2 and the gas distribution pipe 3 is equal or substantially equal.

[0264] In this embodiment, the finned tube heat exchanger assembly is equipped with a refrigerant bridge pipe 12 and the liquid distribution lotus head 2 and the gas distribution pipe 3 are arranged far apart, resulting in ultra-high heat exchange efficiency. The structure of the finned tube heat exchanger assembly is a copper tube M-shape, consisting of four flat finned tube heat exchangers 1. Each refrigerant branch 11 utilizes several straight refrigerant pipes. The refrigerant branches 11 are evenly arranged on the first flat finned tube heat exchanger 1, complementaryly arranged on the second and third flat finned tube heat exchangers 1, and arranged "back-to-back" with the refrigerant liquid pipe 14 connecting to the liquid distribution lotus head 2 on the fourth flat finned tube heat exchanger 1.

[0265] In this embodiment, because "the refrigerant branches 11 are evenly arranged on the first flat finned tube heat exchanger 1 and complementaryly arranged on the second and third flat finned tube heat exchangers 1", the heat load of the second and third flat finned tube heat exchangers 1 is made uniform. Furthermore, because "the refrigerant liquid pipes 14 are arranged back-to-back on the fourth flat finned tube heat exchanger 1, and the condensate inlet pipes of the two adjacent refrigerant branches 11 are arranged "back-to-back" during operation, and the refrigerant liquid pipes 14 connecting the manifold 2 are also arranged "back-to-back", the temperature gradient on the fin assembly between the higher temperature inlet pipe and the lowest temperature outlet pipe is minimized, the heat transfer intensity is minimized, and the "subcooling depth" of the condensate at the condenser outlet is further increased, thereby further improving the evaporator cooling capacity.

[0266] Example 9

[0267] The fundamental changes in the application scenarios of air conditioning units now call for disruptive innovations in the structure of the air conditioning unit itself and the spatial relationship between the air conditioning unit and the equipment platform:

[0268] Firstly, driven by the housing and construction department's policy that "equipment platform area is not included in the building floor area," the independent equipment platform with good accessibility for multi-split air conditioning units has been effectively implemented. The potential of multi-split units to reduce noise radiation range and achieve simple and elegant indoor and outdoor decoration has been fully explored, thus replacing single-split room air conditioners (split air conditioners) and becoming the mainstream product in the air conditioning market.

[0269] Secondly, traditional multi-split air conditioning units with side-discharge axial flow fans enter the equipment platform from the exterior wall of the building. The air inlet and outlet paths of the external heat exchanger face unprecedentedly stringent spatial constraints of the equipment platform, which has a floor below, a ceiling above, a wall behind, and louvers in front. With the side-discharge air conditioning unit facing the louvers, the exhaust static pressure increases, the air volume decreases, and some of the reduced air volume is short-circuited backflow, resulting in a serious degradation of air conditioning performance.

[0270] In response to the aforementioned problems and innovation opportunities in air conditioning application scenarios, this embodiment proposes an air conditioning unit equipment platform that, through innovation in the structure of the air conditioning unit itself and the spatial relationship between the air conditioning unit and the exterior facade of the equipment platform, constructs a high-quality equipment platform with coupling of the air conditioning unit and the exterior facade structure, airflow, and energy.

[0271] The device platform setup in this embodiment is the air conditioning unit of embodiment 2.

[0272] like Figures 26-27 As shown, in this embodiment, an air conditioning unit platform 36 is typically located on the north side of a building, preferably on the north side of a public restroom to reduce the occupation of the building's effective open space resources, and is connected to the north-side living balcony to fundamentally solve the accessibility problem of the platform 36; the air conditioning unit is equipped with vertical strip-shaped exhaust vents, which correspond to the vertical strip-shaped metal mesh 41 reserved on the exterior facade of the platform 36; a decorative exterior facade of the platform 36 can be provided, which can be made of narrow strip-shaped decorative panels staggered front and back, leaving longitudinal gaps between the panels as air inlets; the decorative structure 40 of the exterior facade can be a metal column group, louvers, garden gate, classical entrance door, landscape painting, etc.; this embodiment uses a louver decorative structure 40.

[0273] In this embodiment, when the air conditioning unit is running, fresh air is drawn in through the air inlet of the external heat exchanger, creating a slight negative pressure throughout the entire space of the equipment platform 36. This draws in a large area of ​​ambient air at low speed through the air inlet area on the exterior facade louvers (or other forms of ventilated facade) into the interior space of the equipment platform 36, where the interior space of the equipment platform 36 merges with the air inlet duct of the external heat exchanger. Meanwhile, the small area of ​​metal mesh 41 on the side of the facade corresponding to the vertical strip-shaped air outlet area of ​​the air conditioning unit constitutes the exhaust area. The air inlet and exhaust areas are separated, preventing the possibility of short-circuiting the exhaust air from the air conditioning unit. Furthermore, the exterior facade of the equipment platform 36 serves as... Based on the baseline calculation, in this embodiment, the external heat exchanger of the air conditioning unit is connected to a constricted rearward air guide section. The exhaust port area of ​​the metal mesh 41 on the exterior facade is very small, significantly smaller than the area of ​​the louvers on the exterior facade (less than 1 / 10) which serves as the air intake area. When the air intake airflow passes through the louvers in the louver area, the wind speed is extremely low and the resistance is very small. However, after the exhaust airflow passes through the metal mesh 41 on the side of the louvers, it is injected into the ambient atmosphere at a small angle, resulting in high speed, long range, and good diffusion and dilution effects. The thermal performance of the air conditioning unit on the equipment platform 36 in this embodiment has not decreased compared to the laboratory data, and the task of "heat transporter" is completed with high quality and high efficiency.

[0274] This embodiment eliminates the obstruction of the louvers on the exhaust air of the external heat exchanger of the classic axial fan 9 air conditioning unit by the louvers of the equipment platform 36, integrates the internal space of the equipment platform 36 with the air inlet duct of the external heat exchanger, effectively connects the air path of the external heat exchanger, and ensures the thermal performance of the air conditioning unit. At the same time, it maintains the decorative nature of the louvers and other forms of facade, and achieves a perfect unity between the decorative nature of the facade of the equipment platform 36, the visual effect of the building facade, and the excellent thermal performance of the air conditioning unit.

[0275] The advantages of the device platform 36 in this embodiment are:

[0276] (1) Construct an efficient airflow system for the external heat exchanger of the air conditioning unit to pass through the exterior facade of the equipment platform 36.

[0277] The vertical strip exhaust vent with a rearward exhaust section designed close to the side of the exterior facade of the equipment platform 36 in this embodiment can significantly reduce the width of the exhaust vent and reduce the occupation of the decorative louvers commonly used on the exterior facade, especially the occupation of the effective open space of the building. This maintains the decorative appearance of the louvered building facade and effectively improves the range and diffusion dilution effect of the exhaust air from the external heat exchanger of the air conditioning unit entering the ambient atmosphere through the exterior facade of the equipment platform 36.

[0278] This embodiment eliminates the obstruction of the louvers to the exhaust air of the external heat exchanger of the air conditioning unit with the side outlet of the classic axial flow fan 9, realizes the integration of the internal space of the equipment platform 36 and the air inlet duct of the external heat exchanger, effectively connects the air path of the external heat exchanger, ensures the thermal performance of the air conditioning unit, and maintains the decorative appearance of the louver facade. It achieves a perfect unity between the decorative appearance of the equipment platform 36 facade, the visual effect of the building facade and the excellent thermal performance of the air conditioning unit.

[0279] (2) Increase the power density of the equipment platform and reduce the footprint of the equipment platform.

[0280] The air conditioning unit in this embodiment adopts innovative technologies such as the heat exchanger outlet direction being orthogonal to the fan 9 air inlet direction, the air conditioning unit inlet and outlet being far apart, the finned tube heat exchanger 1 being connected through the refrigerant bridge pipe 12, the liquid distribution lotus head 2 being far apart from the gas distribution pipe 3, and the subcooling sections on the adjacent lotus head flat finned tubes being arranged back to back. It also raises the height of the air conditioning unit to develop the idle space at the top of the equipment platform 36, effectively reducing the area occupied by ineffective and inefficient space on the equipment platform 36, and greatly improving the average cooling and heating power density and energy efficiency ratio of the equipment platform 36, thus saving a significant amount of area of ​​the equipment platform 36 under the same cooling and heating load.

[0281] (3) Favorable for air conditioner unit testing and repair

[0282] In this embodiment, the equipment platform 36 is connected to the north-side living balcony, which solves the accessibility problem of the equipment platform 36;

[0283] The air conditioning unit used in this embodiment centrally houses the compressor, four-way valve, expansion valve, electrical box and other refrigerant circuit components in the compressor chamber 8, which is parallel to the exhaust chamber 7. All refrigerant circuit components of the air conditioning unit are housed in a cavity with only one detachable outer shell. Furthermore, the air conditioning unit is mounted on an accessible equipment platform 36, which fundamentally solves the problem of convenient operation, maintenance and fault repair of the air conditioning unit.

[0284] Example 10

[0285] like Figures 28-32 As shown, this embodiment presents an equipment platform that, through innovation in the structure of the air conditioning unit and the spatial relationship between the air conditioning unit and the exterior of the equipment platform, constructs a commercial air conditioning unit with disruptive features, and a high-quality commercial air conditioning unit equipment platform that achieves structural coupling, airflow coupling, and energy coupling between the commercial air conditioning unit and the exterior of the equipment platform.

[0286] This embodiment discloses a modular commercial air conditioning unit, which is assembled from modules. Each module includes a compressor cavity 31 with a compressor 4, an external heat exchanger assembly cavity 33 with a finned tube heat exchanger assembly as described in Embodiment 8, a vertical exhaust cavity 32, and a longitudinal exhaust cavity 34 connected to the vertical exhaust cavity 32. The longitudinal exhaust cavity 34 is located below the external heat exchanger assembly cavity 33 and is fixedly connected to the bottom plate of the vertical exhaust cavity 32. The compressor cavity 31 is located on the back plate of the longitudinal exhaust cavity 34 and is connected to the external heat exchanger assembly cavity 33 for refrigerant and electrical circuits. The exhaust port 71 of the longitudinal exhaust cavity 34 faces the same direction as the main air inlet 101 of the finned tube heat exchanger assembly.

[0287] The horizontal interface dimension of the longitudinal exhaust cavity 34 is greater than or equal to the horizontal cross-sectional dimension of the external heat exchanger assembly cavity 33.

[0288] The compressor cavity 31 is located on the back plate of the longitudinal exhaust cavity 34.

[0289] Both the longitudinal exhaust chamber 34 and the compressor chamber 31 are provided with a base 35 at their bottom.

[0290] The module's dimensions are designed to allow it to fit into a standard elevator car and its doors.

[0291] This embodiment, while continuing the design techniques adopted by commercial air conditioning units, such as the zigzag-shaped external heat exchanger assembly cavity 33, the main air inlet 101 and the exhaust outlet 71 being arranged on the same side and vertically, the expansion of the top space of the equipment platform 36, and the construction of a low-resistance decorative structure 40 that runs through the exterior facade of the equipment platform, addresses the problems in the background technology by focusing on two main scenario-based and process-based practical technical issues: the vertical transportation of the air conditioning unit using a conventional elevator and the operating space required for maintenance and repair of the air conditioning unit on the equipment platform 36. It implements structural decoupling and modular design for the commercial air conditioning unit, decoupling it into at least three primary components: the compressor cavity 31, the external heat exchanger assembly cavity 33, and the longitudinal exhaust cavity 34. The dimensions of each primary component are designed to meet the requirements of vertical transportation using a conventional elevator.

[0292] In this embodiment, the three primary components—compressor cavity 31, longitudinal exhaust cavity 34, and external heat exchanger assembly cavity 33—are designed and balanced with unified technical parameters and structural dimensions. Each component is independently designed and manufactured and transported in batches to the commercial building equipment platform via elevator. They are then assembled into a complete commercial air conditioning unit. Finally, the refrigerant circuit and electrical circuit of the air conditioning unit and the indoor unit 42 are connected to jointly construct a closed multi-unit refrigerant circuit.

[0293] In this embodiment, the commercial host unit is built from three primary components: compressor cavity 31, longitudinal exhaust cavity 34, and external heat exchanger assembly cavity 33. The external heat exchanger assembly cavity 33 and the longitudinal exhaust cavity 34 are two-section structures, and the compressor cavity 1 is attached to the two-section structure.

[0294] In this embodiment, the longitudinal exhaust cavity 34, which is the lower section of the two-section structure, extends outward on three sides. That is, the horizontal interface size of the longitudinal exhaust cavity 34 is greater than or equal to the horizontal cross-sectional size of the external heat exchanger assembly cavity 33.

[0295] The lateral extensions on the left and right sides increase the width of the longitudinal exhaust cavity 34, reduce the height of the longitudinal exhaust cavity 34 and the vertical proportion of the height of the longitudinal exhaust cavity 34 on the outer facade of the equipment platform, and set a lower limit for the lateral spacing between adjacent main units; the longitudinal extension section on the front side inserts forward above the base 35 into the upper part of the inverted sill of the equipment platform 36, and connects with the pre-installed exhaust port on the outer facade; the longitudinal extension section on the front side connects with the lateral extension sections on both sides to form a platform-like waistband for the air conditioning unit, providing the necessary operating space for operators to install, inspect, maintain and dismantle the external heat exchanger assembly cavity of the air conditioning unit.

[0296] The secondary components of the three primary components in this embodiment are as follows:

[0297] 1. External heat exchanger assembly cavity 33, including finned tube heat exchanger assembly, backward centrifugal fan 9, vertical exhaust cavity 32, etc.; the finned tube heat exchanger assembly is located on the air inlet surface of the main air inlet 101 of the external heat exchanger assembly cavity 33, and together with part of the outer shell, forms a heat exchanger assembly negative pressure cavity that connects the heat exchange air path of the finned tube heat exchanger assembly; an air outlet is provided on the back plate of the heat exchanger assembly negative pressure cavity, and two backward centrifugal fans 9 and vertical exhaust cavity 32 are installed at the air outlet.

[0298] 2. The longitudinal exhaust cavity 34 includes a longitudinal exhaust cavity 33 that connects to the vertical exhaust cavity 32 and a transversely extending exhaust section 34, etc.; the exhaust port 71 of the longitudinal exhaust cavity 34 faces the short side of the air conditioning unit.

[0299] ③ The compressor cavity 31 includes the compressor 4, gas-liquid separator, expansion valve 37, four-way valve 38, electrical box 39, etc.

[0300] In this embodiment, the backward centrifugal fan 9 in the external heat exchanger assembly cavity 33 has an impeller outer diameter that significantly exceeds the impeller suction port diameter, which is the biggest constraint in meeting the structural design conditions of the air conditioning unit for elevator transportation. This embodiment adopts a backward centrifugal fan 9 with low static pressure, large air volume, and low noise. Under the condition that the impeller suction port diameter is determined, the impeller outer diameter is greatly reduced to reduce the constraint of the centrifugal fan on the main unit structural design.

[0301] On the refrigerant side, in this embodiment, the finned tube heat exchanger assembly of the commercial air conditioning unit is connected to the four flat finned tube heat exchangers 1 that make up the copper tube M-shaped finned tube heat exchanger assembly by setting a refrigerant bridge pipe 12; only one set of liquid distribution lotus head 2 and gas distribution pipe 3 is used to implement liquid distribution and gas distribution for the refrigerant branch 11 arranged on the four flat finned tubes of the copper tube M-shaped finned tube heat exchanger assembly; and the liquid distribution lotus head 2 and gas distribution pipe 3 are arranged on opposite sides, that is, far apart, and are located on the two sides of the two finned tube heat exchangers 1 of the M-shaped finned tube heat exchanger assembly.

[0302] From the perspective of the refrigerant circuit structure, this embodiment starts from the liquid distribution lotus head 2, and connects to the corresponding pipe openings and pipes of the first flat finned tube end plate 13 on the side adjacent to the liquid distribution lotus head 2 through a narrow-diameter liquid distribution pipe. Then, it sequentially connects to the corresponding pipe openings and pipes of the refrigerant branch 11 on the second / third flat finned tube through the refrigerant bridge pipe 12 twice each time. Finally, it connects to the gas distribution pipe 3 through the pipe. As the refrigerant branch 11 on the fourth flat finned tube heat exchanger 1 at the end of the condenser, the condensate inlet pipes of the two adjacent refrigerant branches 11 are set "back to back" during operation, and the outlet pipes are also set "back to back". The temperature gradient on the fin group between the inlet pipe with the higher temperature and the outlet pipe with the lowest temperature is the smallest, the heat transfer intensity is the lowest, and the "subcooling depth" of the condensate at the condenser outlet is further increased, thereby further improving the evaporator cooling capacity.

[0303] In this embodiment, during the installation of the combined commercial air conditioning unit, the three primary components—compressor cavity, horizontal exhaust cavity, and external heat exchanger cavity—are transported by elevator to the same floor where the commercial building equipment platform is located, and then horizontally transferred to the equipment platform site. On-site, they are assembled in the order of horizontal exhaust cavity, external heat exchanger cavity, and compressor cavity. The exhaust section of the horizontal exhaust cavity is aligned with the low-level exhaust port reserved on the exterior facade, and the air inlet of the external heat exchanger assembly cavity is aligned with the upper-middle decorative structure 40 on the exterior facade. The vertical exhaust cavity in the external heat exchanger assembly cavity is connected to the horizontal exhaust cavity, completing the internal airflow path of the air conditioning unit's external heat exchanger and the connection between the internal and external airflow paths of the equipment platform. Then, the refrigerant circuit of the compressor cavity and the external heat exchanger assembly cavity are connected to form the complete commercial air conditioning unit. Afterward, it is connected to the refrigerant circuit of the indoor air conditioning unit (or the shell-and-tube heat exchanger or plate heat exchanger built into the unit) to jointly construct a closed multi-unit refrigerant circuit.

[0304] In this embodiment, the longitudinal extension section at the front of the transverse exhaust cavity 7 of the combined commercial air conditioning unit, together with the transverse extension sections on both sides, is connected to form the platform-type waist of the unit, providing important operating space for operators to perform installation, inspection, and maintenance operations on the negative pressure cavity 6 of the air conditioning unit.

[0305] During operation of this embodiment, the ambient fresh air passes through the upper and middle decorative structure 40 (e.g., louvers) on the outer facade of the equipment platform in a large area, at low speed and with low resistance. It then passes through the front air inlet surface and the side air supply strips of the air conditioning unit's external heat exchanger assembly cavity and enters the M-finned tube heat exchanger. After heat exchange, it is drawn in by the centrifugal fan, pressurized and sent into the vertical exhaust cavity in the external heat exchanger assembly cavity, then turns into the bottom horizontal exhaust cavity, and finally is ejected at high speed from the exhaust port of the horizontal exhaust cavity cavity that is connected to the reserved exhaust port on the outer facade, and is discharged into the ambient atmosphere for diffusion and dilution.

[0306] Compared with the prior art, this embodiment has the following beneficial effects:

[0307] (1) The structural optimization and energy efficiency improvement of commercial air conditioning units have been achieved.

[0308] In this embodiment, the external heat exchanger assembly cavity 33 adopts a flat plate finned tube heat exchanger 1 to form a copper tube "IWI" type finned tube heat exchanger assembly structure; wherein, the copper tube M-shaped finned tube heat exchanger assembly part relies on the front air inlet surface for air supply; the flat plate finned tube heat exchanger parts on both sides, except for a small amount of air supply from the front air inlet surface, mainly utilize the lateral interval air supply from both sides of the air conditioning unit.

[0309] In this embodiment, the airflow structure of the commercial air conditioning unit is optimized, and the entire exterior of the equipment platform 36, the front of the commercial air conditioning unit, and the lateral spacing space between adjacent units are used for air supply and exhaust.

[0310] In this embodiment, the copper tube "IWI" type finned tube heat exchanger assembly of the commercial air conditioning unit is connected to the six flat-plate finned tube heat exchangers 1 that make up the copper tube "IWI" type finned tube heat exchanger assembly by setting a refrigerant bridge pipe 12; only one set of liquid distribution lotus head 2 and gas distribution pipe 3 is used to perform liquid and gas distribution for the refrigerant branch 11 arranged on the six flat-plate finned tube heat exchangers 1 of the copper tube "IWI" type finned tube heat exchanger assembly; and the liquid distribution lotus head 2 and gas distribution pipe 3 are arranged on opposite sides, located on the two sides of the two finned tube heat exchangers 1 of the copper tube "IWI" type finned tube heat exchanger assembly; the refrigerant circuit structure of the commercial air conditioning unit in this embodiment is thus optimized, forming the copper tube "I" type finned tube heat exchanger assembly. The four-stage structure of the four finned tubes in the "WI"-shaped finned tube heat exchanger assembly effectively prevents the refrigerant inlet and outlet wall temperatures of the entire copper tube "WI"-shaped finned tube heat exchanger assembly from becoming uniform due to thermal bridging of the copper tube fins, thus reducing the overall temperature difference between the refrigerant and the ambient air. At the same time, in the refrigerant branch 11 on the fourth flat finned tube heat exchanger 1 at the end of the condenser, the condensate inlet pipes of two adjacent refrigerant branches 11 are set "back to back" during operation, and the outlet pipes are also set "back to back". The temperature gradient on the fin group between the higher temperature inlet pipe and the lowest temperature outlet pipe is the smallest, the heat transfer intensity is the lowest, and the "subcooling depth" of the condensate at the condenser outlet is further increased.

[0311] The comprehensive innovation of the above-mentioned air and refrigerant circuit structure in this embodiment further improves the evaporator's cooling capacity and the condenser's heat release, thereby increasing the energy efficiency ratio of the air conditioning system.

[0312] (2) Solved the problem of vertical transportation of high-power commercial coupling air conditioning units at the engineering site.

[0313] This embodiment implements a decoupling and modular design for the commercial air conditioning unit, decoupling the unit into at least three primary components: a compressor cavity, an external heat exchanger assembly cavity, and a longitudinal exhaust cavity. The external heat exchanger assembly cavity and the longitudinal exhaust cavity are two-section structures, with the compressor cavity attached to the two-section structure. The dimensions of each primary component are designed to meet the requirements of vertical transportation in a conventional elevator.

[0314] In this embodiment, the three primary components—compressor cavity, longitudinal exhaust cavity, and external heat exchanger assembly cavity—are planned and balanced in terms of technical parameters and structural dimensions. Each component is designed and manufactured independently and can be transported to the equipment platform on-site using a regular elevator for assembly into a complete commercial coupled air conditioning unit.

[0315] (3) It provides the necessary operating space for the installation, inspection, maintenance, and dismantling of the air conditioning unit.

[0316] In this embodiment, the longitudinal exhaust cavity, which is the lower section of the two-section structure, extends outward on three sides. The lateral extensions on both sides increase the width of the longitudinal exhaust cavity, reduce its height, and increase the vertical proportion of its height on the outer facade of the equipment platform. It also sets a lower limit for the lateral spacing between adjacent air conditioning unit external heat exchanger assembly cavities. The longitudinal extension section on the front side inserts forward above the equipment platform's sill above the chassis, connecting with the pre-installed exhaust vent on the outer facade. The longitudinal extension section on the front side, together with the lateral extension sections on both sides, connects to form the platform-like waistband of the main unit, providing the necessary operating space for operators to perform installation, inspection, maintenance, and dismantling operations on the air conditioning unit's external heat exchanger assembly cavity.

[0317] (4) It has achieved a perfect combination of technology inheritance and innovation.

[0318] This embodiment solves two major practical technical problems: vertical transportation of the air conditioning unit using a conventional elevator and the operational space required for maintenance and repair of the air conditioning unit on the equipment platform 36. It also inherits the technology of a vertically arranged air conditioning unit with a fan 9 and its equipment platform 36 (application number 202310972409.9), employing excellent design technologies such as a zigzag finned tube heat exchanger assembly, simultaneous and vertical placement of the air inlet and outlet, expansion of the top space of the equipment platform 36, and the construction of a low-resistance external heat exchanger airflow path through the decorative structure 40 of the equipment platform 36's facade. This further explores the heat exchange potential of the redundant space at the top of the equipment platform 36, significantly improving the load strength of the air conditioning unit, the lateral linear density of the load on the equipment platform 36, and the aesthetics of the equipment platform 36's facade. In the scenario of a semi-enclosed building corridor (i.e., an embedded equipment platform 36), the innovative design of the air conditioning unit achieves airflow and energy coupling between the air conditioning unit and the decorative structure 40 of the building facade, realizing a perfect combination of technological inheritance and innovation.

[0319] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A finned tube heat exchanger assembly, characterized in that, It includes a finned tube heat exchanger, a liquid manifold connector, and a gas manifold. The finned tube heat exchanger includes, but is not limited to, single-row, double-row, triple-row, quadruple-row, and five-row finned tube heat exchangers; the finned tube heat exchanger includes several refrigerant branches; the liquid interface of each refrigerant branch is connected to the liquid manifold connector, and the gas interface of the refrigerant branch is connected to the gas manifold. The liquid distribution lotus head and the gas distribution pipe are located on the same side end plate of the finned tube heat exchanger. The refrigerant liquid pipes of the two refrigerant branches connected by the manifold are arranged adjacent to each other on the same set of finned plates of the same row of finned tube heat exchangers.

2. The finned tube heat exchanger assembly according to claim 1, characterized in that, Two adjacent refrigerant branches form a refrigerant piping module unit. The two refrigerant liquid pipes in the refrigerant piping module unit are arranged adjacent to each other on the same set of fins on the same row of finned tube heat exchangers. Alternatively, two refrigerant liquid pipes of two adjacent refrigerant piping module units may be arranged adjacently on the same set of fins on the same row of finned tube heat exchangers.

3. The finned tube heat exchanger assembly according to claim 2, characterized in that, Two adjacent refrigerant piping module units, whose refrigerant gas interfaces are connected, are arranged adjacently on the same set of fins on the same row of finned tube heat exchangers; or, two refrigerant gas pipes of the refrigerant piping module unit are arranged adjacently on the same set of fins on the same row of finned tube heat exchangers.

4. A finned tube heat exchanger assembly, characterized in that, It includes several flat-plate finned tube heat exchangers, one liquid manifold, and one gas manifold. The flat plate finned tube heat exchanger includes, but is not limited to, single-row, double-row, triple-row, quadruple-row, and five-row finned tube heat exchangers. The flat-plate finned tube heat exchanger includes several refrigerant branches; The refrigerant branches between different flat-plate finned tube heat exchangers are connected in series via refrigerant bridge pipes. The refrigerant branch connects the liquid distribution lotus head and the gas distribution pipe to form a finned tube heat exchanger assembly.

5. The finned tube heat exchanger assembly according to claim 4, characterized in that, The liquid distribution lotus head and the gas distribution pipe are located on the same side end plate of the same flat plate finned tube heat exchanger; or they are located on the end plates of different flat plate finned tube heat exchangers.

6. The finned tube heat exchanger assembly according to claim 4, characterized in that, Adjacent flat-plate finned tube heat exchangers are connected by refrigerant bridge pipes, and the superheating heat exchange section, phase change heat exchange section, and subcooling heat exchange section of any refrigerant branch from the gas manifold to the liquid manifold are distributed in each flat-plate finned tube heat exchanger; or, any refrigerant branch from the gas manifold to the liquid manifold is segmented and set in each flat-plate finned tube heat exchanger.

7. The finned tube heat exchanger assembly according to claim 4, characterized in that, The refrigerant liquid pipes of the two refrigerant branches connected by the manifold are arranged adjacent to each other on the same set of finned plates of the same row of finned tube heat exchangers.

8. The finned tube heat exchanger assembly according to claim 4, characterized in that, The refrigerant gas pipes of the two refrigerant branches are arranged far apart on the same set of finned plates of the same row of finned tube heat exchangers.

9. The finned tube heat exchanger assembly according to claim 4, characterized in that, The total length of refrigerant piping in any refrigerant branch from the gas manifold to the liquid manifold connector is equal or substantially equal.

10. An air conditioning unit, characterized in that, Includes the finned tube heat exchanger assembly as described in any one of claims 1-9.

11. The air conditioning unit according to claim 10, characterized in that, The air conditioning unit includes a housing, a negative pressure chamber, an exhaust chamber, a compressor chamber, and a fan; The negative pressure chamber and the exhaust chamber are arranged side by side; the compressor chamber is located outside the first back plate of the negative pressure chamber and / or the exhaust chamber; The direction of the air intake of the fan is orthogonal or nearly orthogonal to the main air outlet of the finned tube heat exchanger assembly, thereby creating an airflow vortex between the air outlet of the finned tube heat exchanger assembly and the air intake of the fan in the negative pressure chamber.

12. The air conditioning unit according to claim 10, characterized in that, The air conditioning unit includes a housing, a negative pressure chamber, an exhaust chamber, a compressor chamber, and a fan; The compressor chamber and the exhaust chamber are arranged side by side on the outside of the same side plate of the negative pressure chamber; The direction of the air intake of the fan is orthogonal or nearly orthogonal to the main air outlet of the finned tube heat exchanger assembly, thereby creating an airflow vortex between the air outlet of the finned tube heat exchanger assembly and the air intake of the fan in the negative pressure chamber.

13. The air conditioning unit according to claim 10, characterized in that, It is composed of modules, each module including a compressor cavity with a compressor, an external heat exchanger assembly cavity with a finned tube heat exchanger assembly, a vertical exhaust cavity, and a longitudinal exhaust cavity communicating with the vertical exhaust cavity; The longitudinal exhaust cavity is located below or above the external heat exchanger assembly cavity and is fixedly connected to the bottom plate or top plate of the vertical exhaust cavity. The compressor cavity is located on the side of the longitudinal exhaust cavity and is connected to the external heat exchanger assembly cavity for refrigerant and electrical circuits. The exhaust port of the longitudinal exhaust chamber faces the same direction as the air inlet of the finned tube heat exchanger assembly.

14. The air conditioning unit according to claim 13, characterized in that, The horizontal cross-sectional dimension of the longitudinal exhaust cavity is greater than or equal to the horizontal cross-sectional dimension of the external heat exchanger assembly cavity; The back plate of the external heat exchanger assembly cavity is flush with the back plate of the longitudinal exhaust cavity; the compressor cavity is located on the back plate of the longitudinal exhaust cavity.

15. A device platform, characterized in that, The equipment platform is equipped with the air conditioning unit as described in any one of claims 10-14.

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